/*
- * Copyright (c) 2000-2001 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
*
* @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
*/
+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections. This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ */
/*
* External virtual filesystem routines
*/
-#undef DIAGNOSTIC
-#define DIAGNOSTIC 1
#include <sys/param.h>
#include <sys/systm.h>
-#include <sys/proc.h>
-#include <sys/mount.h>
+#include <sys/proc_internal.h>
+#include <sys/kauth.h>
+#include <sys/mount_internal.h>
#include <sys/time.h>
+#include <sys/lock.h>
#include <sys/vnode.h>
+#include <sys/vnode_internal.h>
#include <sys/stat.h>
#include <sys/namei.h>
#include <sys/ucred.h>
-#include <sys/buf.h>
+#include <sys/buf_internal.h>
#include <sys/errno.h>
#include <sys/malloc.h>
+#include <sys/uio_internal.h>
+#include <sys/uio.h>
#include <sys/domain.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>
-#include <sys/ubc.h>
+#include <sys/ubc_internal.h>
#include <sys/vm.h>
#include <sys/sysctl.h>
+#include <sys/filedesc.h>
+#include <sys/event.h>
+#include <sys/kdebug.h>
+#include <sys/kauth.h>
+#include <sys/user.h>
+#include <sys/kern_memorystatus.h>
+#include <miscfs/fifofs/fifo.h>
+
+#include <string.h>
+#include <machine/spl.h>
+
#include <kern/assert.h>
#include <mach/mach_types.h>
#include <mach/memory_object_types.h>
+#include <mach/memory_object_control.h>
+
+#include <kern/kalloc.h> /* kalloc()/kfree() */
+#include <kern/clock.h> /* delay_for_interval() */
+#include <libkern/OSAtomic.h> /* OSAddAtomic() */
+
+
+#ifdef JOE_DEBUG
+#include <libkern/OSDebug.h>
+#endif
+
+#include <vm/vm_protos.h> /* vnode_pager_vrele() */
+
+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif
+extern lck_grp_t *vnode_lck_grp;
+extern lck_attr_t *vnode_lck_attr;
+
+#if CONFIG_TRIGGERS
+extern lck_grp_t *trigger_vnode_lck_grp;
+extern lck_attr_t *trigger_vnode_lck_attr;
+#endif
+
+extern lck_mtx_t * mnt_list_mtx_lock;
enum vtype iftovt_tab[16] = {
VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
S_IFSOCK, S_IFIFO, S_IFMT,
};
-static void vfree(struct vnode *vp);
-static void vinactive(struct vnode *vp);
-static int vnreclaim(int count);
-extern kern_return_t
- adjust_vm_object_cache(vm_size_t oval, vm_size_t nval);
+
+/* XXX These should be in a BSD accessible Mach header, but aren't. */
+extern void memory_object_mark_used(
+ memory_object_control_t control);
+
+extern void memory_object_mark_unused(
+ memory_object_control_t control,
+ boolean_t rage);
+
+
+/* XXX next protptype should be from <nfs/nfs.h> */
+extern int nfs_vinvalbuf(vnode_t, int, vfs_context_t, int);
+
+/* XXX next prototytype should be from libsa/stdlib.h> but conflicts libkern */
+__private_extern__ void qsort(
+ void * array,
+ size_t nmembers,
+ size_t member_size,
+ int (*)(const void *, const void *));
+
+extern kern_return_t adjust_vm_object_cache(vm_size_t oval, vm_size_t nval);
+__private_extern__ void vntblinit(void);
+__private_extern__ kern_return_t reset_vmobjectcache(unsigned int val1,
+ unsigned int val2);
+__private_extern__ int unlink1(vfs_context_t, struct nameidata *, int);
+
+extern int system_inshutdown;
+
+static void vnode_list_add(vnode_t);
+static void vnode_list_remove(vnode_t);
+static void vnode_list_remove_locked(vnode_t);
+
+static errno_t vnode_drain(vnode_t);
+static void vgone(vnode_t, int flags);
+static void vclean(vnode_t vp, int flag);
+static void vnode_reclaim_internal(vnode_t, int, int, int);
+
+static void vnode_dropiocount (vnode_t);
+
+static vnode_t checkalias(vnode_t vp, dev_t nvp_rdev);
+static int vnode_reload(vnode_t);
+static int vnode_isinuse_locked(vnode_t, int, int);
+
+static void insmntque(vnode_t vp, mount_t mp);
+static int mount_getvfscnt(void);
+static int mount_fillfsids(fsid_t *, int );
+static void vnode_iterate_setup(mount_t);
+int vnode_umount_preflight(mount_t, vnode_t, int);
+static int vnode_iterate_prepare(mount_t);
+static int vnode_iterate_reloadq(mount_t);
+static void vnode_iterate_clear(mount_t);
+static mount_t vfs_getvfs_locked(fsid_t *);
+static int vn_create_reg(vnode_t dvp, vnode_t *vpp, struct nameidata *ndp,
+ struct vnode_attr *vap, uint32_t flags, int fmode, uint32_t *statusp, vfs_context_t ctx);
+static int vnode_authattr_new_internal(vnode_t dvp, struct vnode_attr *vap, int noauth, uint32_t *defaulted_fieldsp, vfs_context_t ctx);
+
+errno_t rmdir_remove_orphaned_appleDouble(vnode_t, vfs_context_t, int *);
+
+#ifdef JOE_DEBUG
+static void record_vp(vnode_t vp, int count);
+#endif
+
+#if CONFIG_TRIGGERS
+static int vnode_resolver_create(mount_t, vnode_t, struct vnode_trigger_param *, boolean_t external);
+static void vnode_resolver_detach(vnode_t);
+#endif
TAILQ_HEAD(freelst, vnode) vnode_free_list; /* vnode free list */
-TAILQ_HEAD(inactivelst, vnode) vnode_inactive_list; /* vnode inactive list */
+TAILQ_HEAD(deadlst, vnode) vnode_dead_list; /* vnode dead list */
+
+TAILQ_HEAD(ragelst, vnode) vnode_rage_list; /* vnode rapid age list */
+struct timeval rage_tv;
+int rage_limit = 0;
+int ragevnodes = 0;
+
+#define RAGE_LIMIT_MIN 100
+#define RAGE_TIME_LIMIT 5
+
struct mntlist mountlist; /* mounted filesystem list */
+static int nummounts = 0;
#if DIAGNOSTIC
#define VLISTCHECK(fun, vp, list) \
if ((vp)->v_freelist.tqe_prev == (struct vnode **)0xdeadb) \
panic("%s: %s vnode not on %slist", (fun), (list), (list));
-
-#define VINACTIVECHECK(fun, vp, expected) \
- do { \
- int __is_inactive = ISSET((vp)->v_flag, VUINACTIVE); \
- if (__is_inactive ^ expected) \
- panic("%s: %sinactive vnode, expected %s", (fun), \
- __is_inactive? "" : "not ", \
- expected? "inactive": "not inactive"); \
- } while(0)
#else
#define VLISTCHECK(fun, vp, list)
-#define VINACTIVECHECK(fun, vp, expected)
#endif /* DIAGNOSTIC */
#define VLISTNONE(vp) \
freevnodes--; \
} while(0)
-/* remove a vnode from inactive vnode list */
-#define VREMINACTIVE(fun, vp) \
+
+
+/* remove a vnode from dead vnode list */
+#define VREMDEAD(fun, vp) \
do { \
- VLISTCHECK((fun), (vp), "inactive"); \
- VINACTIVECHECK((fun), (vp), VUINACTIVE); \
- TAILQ_REMOVE(&vnode_inactive_list, (vp), v_freelist); \
- CLR((vp)->v_flag, VUINACTIVE); \
+ VLISTCHECK((fun), (vp), "dead"); \
+ TAILQ_REMOVE(&vnode_dead_list, (vp), v_freelist); \
VLISTNONE((vp)); \
- inactivevnodes--; \
+ vp->v_listflag &= ~VLIST_DEAD; \
+ deadvnodes--; \
} while(0)
-#define VORECLAIM_ENABLE(vp) \
- do { \
- if (ISSET((vp)->v_flag, VORECLAIM)) \
- panic("vm object raclaim already"); \
- SET((vp)->v_flag, VORECLAIM); \
- } while(0)
-#define VORECLAIM_DISABLE(vp) \
+/* remove a vnode from rage vnode list */
+#define VREMRAGE(fun, vp) \
do { \
- CLR((vp)->v_flag, VORECLAIM); \
- if (ISSET((vp)->v_flag, VXWANT)) { \
- CLR((vp)->v_flag, VXWANT); \
- wakeup((caddr_t)(vp)); \
- } \
+ if ( !(vp->v_listflag & VLIST_RAGE)) \
+ panic("VREMRAGE: vp not on rage list"); \
+ VLISTCHECK((fun), (vp), "rage"); \
+ TAILQ_REMOVE(&vnode_rage_list, (vp), v_freelist); \
+ VLISTNONE((vp)); \
+ vp->v_listflag &= ~VLIST_RAGE; \
+ ragevnodes--; \
} while(0)
-/*
- * Have to declare first two locks as actual data even if !MACH_SLOCKS, since
- * a pointers to them get passed around.
- */
-simple_lock_data_t mountlist_slock;
-simple_lock_data_t mntvnode_slock;
-decl_simple_lock_data(,mntid_slock);
-decl_simple_lock_data(,vnode_free_list_slock);
-decl_simple_lock_data(,spechash_slock);
/*
- * vnodetarget is the amount of vnodes we expect to get back
- * from the the inactive vnode list and VM object cache.
- * As vnreclaim() is a mainly cpu bound operation for faster
- * processers this number could be higher.
- * Having this number too high introduces longer delays in
- * the execution of getnewvnode().
- */
-unsigned long vnodetarget; /* target for vnreclaim() */
+ * vnodetarget hasn't been used in a long time, but
+ * it was exported for some reason... I'm leaving in
+ * place for now... it should be deprecated out of the
+ * exports and removed eventually.
+ */
+u_int32_t vnodetarget; /* target for vnreclaim() */
#define VNODE_FREE_TARGET 20 /* Default value for vnodetarget */
/*
* cache. Having too few vnodes on the free list causes serious disk
* thrashing as we cycle through them.
*/
-#define VNODE_FREE_MIN 300 /* freelist should have at least these many */
-
-/*
- * We need to get vnodes back from the VM object cache when a certain #
- * of vnodes are reused from the freelist. This is essential for the
- * caching to be effective in the namecache and the buffer cache [for the
- * metadata].
- */
-#define VNODE_TOOMANY_REUSED (VNODE_FREE_MIN/4)
-
-/*
- * If we have enough vnodes on the freelist we do not want to reclaim
- * the vnodes from the VM object cache.
- */
-#define VNODE_FREE_ENOUGH (VNODE_FREE_MIN + (VNODE_FREE_MIN/2))
+#define VNODE_FREE_MIN CONFIG_VNODE_FREE_MIN /* freelist should have at least this many */
/*
* Initialize the vnode management data structures.
*/
__private_extern__ void
-vntblinit()
+vntblinit(void)
{
- extern struct lock__bsd__ exchangelock;
-
- simple_lock_init(&mountlist_slock);
- simple_lock_init(&mntvnode_slock);
- simple_lock_init(&mntid_slock);
- simple_lock_init(&spechash_slock);
TAILQ_INIT(&vnode_free_list);
- simple_lock_init(&vnode_free_list_slock);
- TAILQ_INIT(&vnode_inactive_list);
- CIRCLEQ_INIT(&mountlist);
- lockinit(&exchangelock, PVFS, "exchange", 0, 0);
+ TAILQ_INIT(&vnode_rage_list);
+ TAILQ_INIT(&vnode_dead_list);
+ TAILQ_INIT(&mountlist);
if (!vnodetarget)
vnodetarget = VNODE_FREE_TARGET;
+ microuptime(&rage_tv);
+ rage_limit = desiredvnodes / 100;
+
+ if (rage_limit < RAGE_LIMIT_MIN)
+ rage_limit = RAGE_LIMIT_MIN;
+
/*
* Scale the vm_object_cache to accomodate the vnodes
* we want to cache
vm_size_t oval = val1 - VNODE_FREE_MIN;
vm_size_t nval;
+ if (val1 == val2) {
+ return KERN_SUCCESS;
+ }
+
if(val2 < VNODE_FREE_MIN)
nval = 0;
else
return(adjust_vm_object_cache(oval, nval));
}
-/*
- * Mark a mount point as busy. Used to synchronize access and to delay
- * unmounting. Interlock is not released on failure.
- */
+
+/* the timeout is in 10 msecs */
int
-vfs_busy(mp, flags, interlkp, p)
- struct mount *mp;
- int flags;
- struct slock *interlkp;
- struct proc *p;
-{
- int lkflags;
+vnode_waitforwrites(vnode_t vp, int output_target, int slpflag, int slptimeout, const char *msg) {
+ int error = 0;
+ struct timespec ts;
- if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
- if (flags & LK_NOWAIT)
- return (ENOENT);
- mp->mnt_kern_flag |= MNTK_MWAIT;
- if (interlkp)
- simple_unlock(interlkp);
- /*
- * Since all busy locks are shared except the exclusive
- * lock granted when unmounting, the only place that a
- * wakeup needs to be done is at the release of the
- * exclusive lock at the end of dounmount.
- */
- sleep((caddr_t)mp, PVFS);
- if (interlkp)
- simple_lock(interlkp);
- return (ENOENT);
- }
- lkflags = LK_SHARED;
- if (interlkp)
- lkflags |= LK_INTERLOCK;
- if (lockmgr(&mp->mnt_lock, lkflags, interlkp, p))
- panic("vfs_busy: unexpected lock failure");
- return (0);
+ KERNEL_DEBUG(0x3010280 | DBG_FUNC_START, (int)vp, output_target, vp->v_numoutput, 0, 0);
+
+ if (vp->v_numoutput > output_target) {
+
+ slpflag |= PDROP;
+
+ vnode_lock_spin(vp);
+
+ while ((vp->v_numoutput > output_target) && error == 0) {
+ if (output_target)
+ vp->v_flag |= VTHROTTLED;
+ else
+ vp->v_flag |= VBWAIT;
+
+ ts.tv_sec = (slptimeout/100);
+ ts.tv_nsec = (slptimeout % 1000) * 10 * NSEC_PER_USEC * 1000 ;
+ error = msleep((caddr_t)&vp->v_numoutput, &vp->v_lock, (slpflag | (PRIBIO + 1)), msg, &ts);
+
+ vnode_lock_spin(vp);
+ }
+ vnode_unlock(vp);
+ }
+ KERNEL_DEBUG(0x3010280 | DBG_FUNC_END, (int)vp, output_target, vp->v_numoutput, error, 0);
+
+ return error;
}
-/*
- * Free a busy filesystem.
- */
+
void
-vfs_unbusy(mp, p)
- struct mount *mp;
- struct proc *p;
+vnode_startwrite(vnode_t vp) {
+
+ OSAddAtomic(1, &vp->v_numoutput);
+}
+
+
+void
+vnode_writedone(vnode_t vp)
{
+ if (vp) {
+ int need_wakeup = 0;
+
+ OSAddAtomic(-1, &vp->v_numoutput);
- lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, p);
+ vnode_lock_spin(vp);
+
+ if (vp->v_numoutput < 0)
+ panic("vnode_writedone: numoutput < 0");
+
+ if ((vp->v_flag & VTHROTTLED)) {
+ vp->v_flag &= ~VTHROTTLED;
+ need_wakeup = 1;
+ }
+ if ((vp->v_flag & VBWAIT) && (vp->v_numoutput == 0)) {
+ vp->v_flag &= ~VBWAIT;
+ need_wakeup = 1;
+ }
+ vnode_unlock(vp);
+
+ if (need_wakeup)
+ wakeup((caddr_t)&vp->v_numoutput);
+ }
}
-/*
- * Lookup a filesystem type, and if found allocate and initialize
- * a mount structure for it.
- *
- * Devname is usually updated by mount(8) after booting.
- */
+
+
int
-vfs_rootmountalloc(fstypename, devname, mpp)
- char *fstypename;
- char *devname;
- struct mount **mpp;
+vnode_hasdirtyblks(vnode_t vp)
{
- struct proc *p = current_proc(); /* XXX */
- struct vfsconf *vfsp;
- struct mount *mp;
+ struct cl_writebehind *wbp;
- for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
- if (!strcmp(vfsp->vfc_name, fstypename))
- break;
- if (vfsp == NULL)
- return (ENODEV);
- mp = _MALLOC_ZONE((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
- bzero((char *)mp, (u_long)sizeof(struct mount));
+ /*
+ * Not taking the buf_mtxp as there is little
+ * point doing it. Even if the lock is taken the
+ * state can change right after that. If their
+ * needs to be a synchronization, it must be driven
+ * by the caller
+ */
+ if (vp->v_dirtyblkhd.lh_first)
+ return (1);
+
+ if (!UBCINFOEXISTS(vp))
+ return (0);
- /* Initialize the default IO constraints */
- mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
- mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;
+ wbp = vp->v_ubcinfo->cl_wbehind;
+
+ if (wbp && (wbp->cl_number || wbp->cl_scmap))
+ return (1);
- lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0);
- (void)vfs_busy(mp, LK_NOWAIT, 0, p);
- LIST_INIT(&mp->mnt_vnodelist);
- mp->mnt_vfc = vfsp;
- mp->mnt_op = vfsp->vfc_vfsops;
- mp->mnt_flag = MNT_RDONLY;
- mp->mnt_vnodecovered = NULLVP;
- vfsp->vfc_refcount++;
- mp->mnt_stat.f_type = vfsp->vfc_typenum;
- mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
- strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
- mp->mnt_stat.f_mntonname[0] = '/';
- (void) copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 0);
- *mpp = mp;
return (0);
}
-/*
- * Find an appropriate filesystem to use for the root. If a filesystem
- * has not been preselected, walk through the list of known filesystems
- * trying those that have mountroot routines, and try them until one
- * works or we have tried them all.
- */
int
-vfs_mountroot()
+vnode_hascleanblks(vnode_t vp)
{
- struct vfsconf *vfsp;
- extern int (*mountroot)(void);
- int error;
+ /*
+ * Not taking the buf_mtxp as there is little
+ * point doing it. Even if the lock is taken the
+ * state can change right after that. If their
+ * needs to be a synchronization, it must be driven
+ * by the caller
+ */
+ if (vp->v_cleanblkhd.lh_first)
+ return (1);
+ return (0);
+}
- if (mountroot != NULL) {
- error = (*mountroot)();
- return (error);
- }
-
- for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
- if (vfsp->vfc_mountroot == NULL)
- continue;
- if ((error = (*vfsp->vfc_mountroot)()) == 0)
- return (0);
- if (error != EINVAL)
- printf("%s_mountroot failed: %d\n", vfsp->vfc_name, error);
+void
+vnode_iterate_setup(mount_t mp)
+{
+ while (mp->mnt_lflag & MNT_LITER) {
+ mp->mnt_lflag |= MNT_LITERWAIT;
+ msleep((caddr_t)mp, &mp->mnt_mlock, PVFS, "vnode_iterate_setup", NULL);
}
- return (ENODEV);
+
+ mp->mnt_lflag |= MNT_LITER;
+
}
-/*
- * Lookup a mount point by filesystem identifier.
- */
-struct mount *
-vfs_getvfs(fsid)
- fsid_t *fsid;
+int
+vnode_umount_preflight(mount_t mp, vnode_t skipvp, int flags)
{
- register struct mount *mp;
+ vnode_t vp;
- simple_lock(&mountlist_slock);
- for (mp = mountlist.cqh_first; mp != (void *)&mountlist;
- mp = mp->mnt_list.cqe_next) {
- if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] &&
- mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) {
- simple_unlock(&mountlist_slock);
- return (mp);
+ TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) {
+ /* disable preflight only for udf, a hack to be removed after 4073176 is fixed */
+ if (vp->v_tag == VT_UDF)
+ return 0;
+ if (vp->v_type == VDIR)
+ continue;
+ if (vp == skipvp)
+ continue;
+ if ((flags & SKIPSYSTEM) && ((vp->v_flag & VSYSTEM) ||
+ (vp->v_flag & VNOFLUSH)))
+ continue;
+ if ((flags & SKIPSWAP) && (vp->v_flag & VSWAP))
+ continue;
+ if ((flags & WRITECLOSE) &&
+ (vp->v_writecount == 0 || vp->v_type != VREG))
+ continue;
+ /* Look for busy vnode */
+ if (((vp->v_usecount != 0) &&
+ ((vp->v_usecount - vp->v_kusecount) != 0)))
+ return(1);
}
- }
- simple_unlock(&mountlist_slock);
- return ((struct mount *)0);
+
+ return(0);
}
-/*
- * Get a new unique fsid
+/*
+ * This routine prepares iteration by moving all the vnodes to worker queue
+ * called with mount lock held
*/
-void
-vfs_getnewfsid(mp)
- struct mount *mp;
+int
+vnode_iterate_prepare(mount_t mp)
{
-static u_short xxxfs_mntid;
+ vnode_t vp;
- fsid_t tfsid;
- int mtype;
+ if (TAILQ_EMPTY(&mp->mnt_vnodelist)) {
+ /* nothing to do */
+ return (0);
+ }
- simple_lock(&mntid_slock);
- mtype = mp->mnt_vfc->vfc_typenum;
- mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0);
- mp->mnt_stat.f_fsid.val[1] = mtype;
- if (xxxfs_mntid == 0)
- ++xxxfs_mntid;
- tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid);
- tfsid.val[1] = mtype;
- if (mountlist.cqh_first != (void *)&mountlist) {
- while (vfs_getvfs(&tfsid)) {
- tfsid.val[0]++;
- xxxfs_mntid++;
- }
- }
- mp->mnt_stat.f_fsid.val[0] = tfsid.val[0];
- simple_unlock(&mntid_slock);
+ vp = TAILQ_FIRST(&mp->mnt_vnodelist);
+ vp->v_mntvnodes.tqe_prev = &(mp->mnt_workerqueue.tqh_first);
+ mp->mnt_workerqueue.tqh_first = mp->mnt_vnodelist.tqh_first;
+ mp->mnt_workerqueue.tqh_last = mp->mnt_vnodelist.tqh_last;
+
+ TAILQ_INIT(&mp->mnt_vnodelist);
+ if (mp->mnt_newvnodes.tqh_first != NULL)
+ panic("vnode_iterate_prepare: newvnode when entering vnode");
+ TAILQ_INIT(&mp->mnt_newvnodes);
+
+ return (1);
}
-/*
- * Set vnode attributes to VNOVAL
- */
-void
-vattr_null(vap)
- register struct vattr *vap;
+
+/* called with mount lock held */
+int
+vnode_iterate_reloadq(mount_t mp)
{
+ int moved = 0;
+
+ /* add the remaining entries in workerq to the end of mount vnode list */
+ if (!TAILQ_EMPTY(&mp->mnt_workerqueue)) {
+ struct vnode * mvp;
+ mvp = TAILQ_LAST(&mp->mnt_vnodelist, vnodelst);
+
+ /* Joining the workerque entities to mount vnode list */
+ if (mvp)
+ mvp->v_mntvnodes.tqe_next = mp->mnt_workerqueue.tqh_first;
+ else
+ mp->mnt_vnodelist.tqh_first = mp->mnt_workerqueue.tqh_first;
+ mp->mnt_workerqueue.tqh_first->v_mntvnodes.tqe_prev = mp->mnt_vnodelist.tqh_last;
+ mp->mnt_vnodelist.tqh_last = mp->mnt_workerqueue.tqh_last;
+ TAILQ_INIT(&mp->mnt_workerqueue);
+ }
+
+ /* add the newvnodes to the head of mount vnode list */
+ if (!TAILQ_EMPTY(&mp->mnt_newvnodes)) {
+ struct vnode * nlvp;
+ nlvp = TAILQ_LAST(&mp->mnt_newvnodes, vnodelst);
+
+ mp->mnt_newvnodes.tqh_first->v_mntvnodes.tqe_prev = &mp->mnt_vnodelist.tqh_first;
+ nlvp->v_mntvnodes.tqe_next = mp->mnt_vnodelist.tqh_first;
+ if(mp->mnt_vnodelist.tqh_first)
+ mp->mnt_vnodelist.tqh_first->v_mntvnodes.tqe_prev = &nlvp->v_mntvnodes.tqe_next;
+ else
+ mp->mnt_vnodelist.tqh_last = mp->mnt_newvnodes.tqh_last;
+ mp->mnt_vnodelist.tqh_first = mp->mnt_newvnodes.tqh_first;
+ TAILQ_INIT(&mp->mnt_newvnodes);
+ moved = 1;
+ }
- vap->va_type = VNON;
- vap->va_size = vap->va_bytes = VNOVAL;
- vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid =
- vap->va_fsid = vap->va_fileid =
- vap->va_blocksize = vap->va_rdev =
- vap->va_atime.tv_sec = vap->va_atime.tv_nsec =
- vap->va_mtime.tv_sec = vap->va_mtime.tv_nsec =
- vap->va_ctime.tv_sec = vap->va_ctime.tv_nsec =
- vap->va_flags = vap->va_gen = VNOVAL;
- vap->va_vaflags = 0;
+ return(moved);
}
-/*
- * Routines having to do with the management of the vnode table.
- */
-extern int (**dead_vnodeop_p)(void *);
-static void vclean __P((struct vnode *vp, int flag, struct proc *p));
-extern void vgonel __P((struct vnode *vp, struct proc *p));
-long numvnodes, freevnodes;
-long inactivevnodes;
-long vnode_reclaim_tried;
-long vnode_objects_reclaimed;
+void
+vnode_iterate_clear(mount_t mp)
+{
+ mp->mnt_lflag &= ~MNT_LITER;
+ if (mp->mnt_lflag & MNT_LITERWAIT) {
+ mp->mnt_lflag &= ~MNT_LITERWAIT;
+ wakeup(mp);
+ }
+}
-extern struct vattr va_null;
-/*
- * Return the next vnode from the free list.
- */
int
-getnewvnode(tag, mp, vops, vpp)
- enum vtagtype tag;
- struct mount *mp;
- int (**vops)(void *);
- struct vnode **vpp;
+vnode_iterate(mount_t mp, int flags, int (*callout)(struct vnode *, void *),
+ void *arg)
{
- struct proc *p = current_proc(); /* XXX */
struct vnode *vp;
- int cnt, didretry = 0;
- static int reused = 0; /* track the reuse rate */
- int reclaimhits = 0;
+ int vid, retval;
+ int ret = 0;
-retry:
- simple_lock(&vnode_free_list_slock);
- /*
- * MALLOC a vnode if the number of vnodes has not reached the desired
- * value and the number on the free list is still reasonable...
- * reuse from the freelist even though we may evict a name cache entry
- * to reduce the number of vnodes that accumulate.... vnodes tie up
- * wired memory and are never garbage collected
- */
- if (numvnodes < desiredvnodes && (freevnodes < (2 * VNODE_FREE_MIN))) {
- numvnodes++;
- simple_unlock(&vnode_free_list_slock);
- MALLOC_ZONE(vp, struct vnode *, sizeof *vp, M_VNODE, M_WAITOK);
- bzero((char *)vp, sizeof *vp);
- VLISTNONE(vp); /* avoid double queue removal */
- simple_lock_init(&vp->v_interlock);
- goto done;
- }
+ mount_lock(mp);
- /*
- * Once the desired number of vnodes are allocated,
- * we start reusing the vnodes.
- */
- if (freevnodes < VNODE_FREE_MIN) {
- /*
- * if we are low on vnodes on the freelist attempt to get
- * some back from the inactive list and VM object cache
- */
- simple_unlock(&vnode_free_list_slock);
- (void)vnreclaim(vnodetarget);
- simple_lock(&vnode_free_list_slock);
- }
- if (numvnodes >= desiredvnodes && reused > VNODE_TOOMANY_REUSED) {
- reused = 0;
- if (freevnodes < VNODE_FREE_ENOUGH) {
- simple_unlock(&vnode_free_list_slock);
- (void)vnreclaim(vnodetarget);
- simple_lock(&vnode_free_list_slock);
- }
- }
-
- for (cnt = 0, vp = vnode_free_list.tqh_first;
- vp != NULLVP; cnt++, vp = vp->v_freelist.tqe_next) {
- if (simple_lock_try(&vp->v_interlock)) {
- /* got the interlock */
- if (ISSET(vp->v_flag, VORECLAIM)) {
- /* skip over the vnodes that are being reclaimed */
- simple_unlock(&vp->v_interlock);
- reclaimhits++;
- } else
- break;
- }
- }
+ vnode_iterate_setup(mp);
- /*
- * Unless this is a bad time of the month, at most
- * the first NCPUS items on the free list are
- * locked, so this is close enough to being empty.
- */
- if (vp == NULLVP) {
- simple_unlock(&vnode_free_list_slock);
- if (!(didretry++) && (vnreclaim(vnodetarget) > 0))
- goto retry;
- tablefull("vnode");
- log(LOG_EMERG, "%d vnodes locked, %d desired, %d numvnodes, "
- "%d free, %d inactive, %d being reclaimed\n",
- cnt, desiredvnodes, numvnodes, freevnodes, inactivevnodes,
- reclaimhits);
- *vpp = 0;
- return (ENFILE);
+ /* it is returns 0 then there is nothing to do */
+ retval = vnode_iterate_prepare(mp);
+
+ if (retval == 0) {
+ vnode_iterate_clear(mp);
+ mount_unlock(mp);
+ return(ret);
}
+
+ /* iterate over all the vnodes */
+ while (!TAILQ_EMPTY(&mp->mnt_workerqueue)) {
+ vp = TAILQ_FIRST(&mp->mnt_workerqueue);
+ TAILQ_REMOVE(&mp->mnt_workerqueue, vp, v_mntvnodes);
+ TAILQ_INSERT_TAIL(&mp->mnt_vnodelist, vp, v_mntvnodes);
+ vid = vp->v_id;
+ if ((vp->v_data == NULL) || (vp->v_type == VNON) || (vp->v_mount != mp)) {
+ continue;
+ }
+ mount_unlock(mp);
- if (vp->v_usecount)
- panic("free vnode isn't: v_type = %d, v_usecount = %d?",
- vp->v_type, vp->v_usecount);
+ if ( vget_internal(vp, vid, (flags | VNODE_NODEAD| VNODE_WITHID | VNODE_NOSUSPEND))) {
+ mount_lock(mp);
+ continue;
+ }
+ if (flags & VNODE_RELOAD) {
+ /*
+ * we're reloading the filesystem
+ * cast out any inactive vnodes...
+ */
+ if (vnode_reload(vp)) {
+ /* vnode will be recycled on the refcount drop */
+ vnode_put(vp);
+ mount_lock(mp);
+ continue;
+ }
+ }
- VREMFREE("getnewvnode", vp);
- reused++;
- simple_unlock(&vnode_free_list_slock);
- vp->v_lease = NULL;
- cache_purge(vp);
- if (vp->v_type != VBAD)
- vgonel(vp, p); /* clean and reclaim the vnode */
- else
- simple_unlock(&vp->v_interlock);
-#if DIAGNOSTIC
- if (vp->v_data)
- panic("cleaned vnode isn't");
- {
- int s = splbio();
- if (vp->v_numoutput)
- panic("Clean vnode has pending I/O's");
- splx(s);
+ retval = callout(vp, arg);
+
+ switch (retval) {
+ case VNODE_RETURNED:
+ case VNODE_RETURNED_DONE:
+ vnode_put(vp);
+ if (retval == VNODE_RETURNED_DONE) {
+ mount_lock(mp);
+ ret = 0;
+ goto out;
+ }
+ break;
+
+ case VNODE_CLAIMED_DONE:
+ mount_lock(mp);
+ ret = 0;
+ goto out;
+ case VNODE_CLAIMED:
+ default:
+ break;
+ }
+ mount_lock(mp);
}
-#endif
- if (UBCINFOEXISTS(vp))
- panic("getnewvnode: ubcinfo not cleaned");
- else
- vp->v_ubcinfo = 0;
- vp->v_lastr = -1;
- vp->v_ralen = 0;
- vp->v_maxra = 0;
- vp->v_lastw = 0;
- vp->v_ciosiz = 0;
- vp->v_cstart = 0;
- vp->v_clen = 0;
- vp->v_socket = 0;
+out:
+ (void)vnode_iterate_reloadq(mp);
+ vnode_iterate_clear(mp);
+ mount_unlock(mp);
+ return (ret);
+}
-done:
- vp->v_flag = VSTANDARD;
- vp->v_type = VNON;
- vp->v_tag = tag;
- vp->v_op = vops;
- insmntque(vp, mp);
- *vpp = vp;
- vp->v_usecount = 1;
- vp->v_data = 0;
- return (0);
+void
+mount_lock_renames(mount_t mp)
+{
+ lck_mtx_lock(&mp->mnt_renamelock);
}
-/*
- * Move a vnode from one mount queue to another.
- */
void
-insmntque(vp, mp)
- struct vnode *vp;
- struct mount *mp;
+mount_unlock_renames(mount_t mp)
{
+ lck_mtx_unlock(&mp->mnt_renamelock);
+}
- simple_lock(&mntvnode_slock);
- /*
- * Delete from old mount point vnode list, if on one.
- */
- if (vp->v_mount != NULL)
- LIST_REMOVE(vp, v_mntvnodes);
- /*
- * Insert into list of vnodes for the new mount point, if available.
- */
- if ((vp->v_mount = mp) != NULL)
- LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes);
- simple_unlock(&mntvnode_slock);
+void
+mount_lock(mount_t mp)
+{
+ lck_mtx_lock(&mp->mnt_mlock);
}
-__inline void
-vpwakeup(struct vnode *vp)
+void
+mount_lock_spin(mount_t mp)
{
- if (vp) {
- if (--vp->v_numoutput < 0)
- panic("vpwakeup: neg numoutput");
- if ((vp->v_flag & VBWAIT || vp->v_flag & VTHROTTLED)
- && vp->v_numoutput <= 0) {
- vp->v_flag &= ~(VBWAIT|VTHROTTLED);
- wakeup((caddr_t)&vp->v_numoutput);
- }
- }
+ lck_mtx_lock_spin(&mp->mnt_mlock);
}
-/*
- * Update outstanding I/O count and do wakeup if requested.
- */
void
-vwakeup(bp)
- register struct buf *bp;
+mount_unlock(mount_t mp)
{
- CLR(bp->b_flags, B_WRITEINPROG);
- vpwakeup(bp->b_vp);
+ lck_mtx_unlock(&mp->mnt_mlock);
}
-/*
- * Flush out and invalidate all buffers associated with a vnode.
- * Called with the underlying object locked.
- */
-int
-vinvalbuf(vp, flags, cred, p, slpflag, slptimeo)
- register struct vnode *vp;
- int flags;
- struct ucred *cred;
- struct proc *p;
- int slpflag, slptimeo;
-{
- register struct buf *bp;
- struct buf *nbp, *blist;
- int s, error = 0;
-
- if (flags & V_SAVE) {
- if (error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) {
- return (error);
- }
- if (vp->v_dirtyblkhd.lh_first)
- panic("vinvalbuf: dirty bufs");
- }
-
- for (;;) {
- if ((blist = vp->v_cleanblkhd.lh_first) && flags & V_SAVEMETA)
- while (blist && blist->b_lblkno < 0)
- blist = blist->b_vnbufs.le_next;
- if (!blist && (blist = vp->v_dirtyblkhd.lh_first) &&
- (flags & V_SAVEMETA))
- while (blist && blist->b_lblkno < 0)
- blist = blist->b_vnbufs.le_next;
- if (!blist)
- break;
-
- for (bp = blist; bp; bp = nbp) {
- nbp = bp->b_vnbufs.le_next;
- if (flags & V_SAVEMETA && bp->b_lblkno < 0)
- continue;
- s = splbio();
- if (ISSET(bp->b_flags, B_BUSY)) {
- SET(bp->b_flags, B_WANTED);
- error = tsleep((caddr_t)bp,
- slpflag | (PRIBIO + 1), "vinvalbuf",
- slptimeo);
- splx(s);
- if (error) {
- return (error);
- }
- break;
- }
- bremfree(bp);
- SET(bp->b_flags, B_BUSY);
- splx(s);
- /*
- * XXX Since there are no node locks for NFS, I believe
- * there is a slight chance that a delayed write will
- * occur while sleeping just above, so check for it.
- */
- if (ISSET(bp->b_flags, B_DELWRI) && (flags & V_SAVE)) {
- (void) VOP_BWRITE(bp);
- break;
- }
- SET(bp->b_flags, B_INVAL);
- brelse(bp);
- }
- }
- if (!(flags & V_SAVEMETA) &&
- (vp->v_dirtyblkhd.lh_first || vp->v_cleanblkhd.lh_first))
- panic("vinvalbuf: flush failed");
- return (0);
-}
-/*
- * Create a vnode for a block device.
- * Used for root filesystem, argdev, and swap areas.
- * Also used for memory file system special devices.
- */
-int
-bdevvp(dev, vpp)
- dev_t dev;
- struct vnode **vpp;
+void
+mount_ref(mount_t mp, int locked)
{
- register struct vnode *vp;
- struct vnode *nvp;
- int error;
+ if ( !locked)
+ mount_lock_spin(mp);
+
+ mp->mnt_count++;
- if (dev == NODEV) {
- *vpp = NULLVP;
- return (ENODEV);
- }
- error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp);
- if (error) {
- *vpp = NULLVP;
- return (error);
- }
- vp = nvp;
- vp->v_type = VBLK;
- if (nvp = checkalias(vp, dev, (struct mount *)0)) {
- vput(vp);
- vp = nvp;
- }
- *vpp = vp;
- return (0);
+ if ( !locked)
+ mount_unlock(mp);
}
-/*
- * Check to see if the new vnode represents a special device
- * for which we already have a vnode (either because of
- * bdevvp() or because of a different vnode representing
- * the same block device). If such an alias exists, deallocate
- * the existing contents and return the aliased vnode. The
- * caller is responsible for filling it with its new contents.
- */
-struct vnode *
-checkalias(nvp, nvp_rdev, mp)
- register struct vnode *nvp;
- dev_t nvp_rdev;
- struct mount *mp;
+
+void
+mount_drop(mount_t mp, int locked)
{
- struct proc *p = current_proc(); /* XXX */
- struct vnode *vp;
- struct vnode **vpp;
- struct specinfo * bufhold;
- int buffree = 1;
+ if ( !locked)
+ mount_lock_spin(mp);
+
+ mp->mnt_count--;
- if (nvp->v_type != VBLK && nvp->v_type != VCHR)
- return (NULLVP);
+ if (mp->mnt_count == 0 && (mp->mnt_lflag & MNT_LDRAIN))
+ wakeup(&mp->mnt_lflag);
- bufhold = (struct specinfo *)_MALLOC_ZONE(sizeof(struct specinfo),
- M_VNODE, M_WAITOK);
- vpp = &speclisth[SPECHASH(nvp_rdev)];
-loop:
- simple_lock(&spechash_slock);
- for (vp = *vpp; vp; vp = vp->v_specnext) {
- if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type)
- continue;
- /*
- * Alias, but not in use, so flush it out.
- */
- simple_lock(&vp->v_interlock);
- if (vp->v_usecount == 0) {
- simple_unlock(&spechash_slock);
- vgonel(vp, p);
- goto loop;
- }
- if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) {
- simple_unlock(&spechash_slock);
- goto loop;
- }
- break;
- }
- if (vp == NULL || vp->v_tag != VT_NON) {
- nvp->v_specinfo = bufhold;
- buffree = 0; /* buffer used */
- bzero(nvp->v_specinfo, sizeof(struct specinfo));
- nvp->v_rdev = nvp_rdev;
- nvp->v_hashchain = vpp;
- nvp->v_specnext = *vpp;
- nvp->v_specflags = 0;
- simple_unlock(&spechash_slock);
- *vpp = nvp;
- if (vp != NULLVP) {
- nvp->v_flag |= VALIASED;
- vp->v_flag |= VALIASED;
- vput(vp);
- }
- /* Since buffer is used just return */
- return (NULLVP);
- }
- simple_unlock(&spechash_slock);
- VOP_UNLOCK(vp, 0, p);
- simple_lock(&vp->v_interlock);
- vclean(vp, 0, p);
- vp->v_op = nvp->v_op;
- vp->v_tag = nvp->v_tag;
- nvp->v_type = VNON;
- insmntque(vp, mp);
- if (buffree)
- _FREE_ZONE((void *)bufhold, sizeof (struct specinfo), M_VNODE);
- return (vp);
+ if ( !locked)
+ mount_unlock(mp);
}
-/*
- * Get a reference on a particular vnode and lock it if requested.
- * If the vnode was on the inactive list, remove it from the list.
- * If the vnode was on the free list, remove it from the list and
- * move it to inactive list as needed.
- * The vnode lock bit is set if the vnode is being eliminated in
- * vgone. The process is awakened when the transition is completed,
- * and an error returned to indicate that the vnode is no longer
- * usable (possibly having been changed to a new file system type).
- */
+
int
-vget(vp, flags, p)
- struct vnode *vp;
- int flags;
- struct proc *p;
+mount_iterref(mount_t mp, int locked)
{
- int error = 0;
-
-retry:
+ int retval = 0;
- /*
- * If the vnode is in the process of being cleaned out for
- * another use, we wait for the cleaning to finish and then
- * return failure. Cleaning is determined by checking that
- * the VXLOCK flag is set.
- */
- if ((flags & LK_INTERLOCK) == 0)
- simple_lock(&vp->v_interlock);
- if ((vp->v_flag & VXLOCK) || (vp->v_flag & VORECLAIM)) {
- vp->v_flag |= VXWANT;
- simple_unlock(&vp->v_interlock);
- (void)tsleep((caddr_t)vp, PINOD, "vget", 0);
- return (ENOENT);
+ if (!locked)
+ mount_list_lock();
+ if (mp->mnt_iterref < 0) {
+ retval = 1;
+ } else {
+ mp->mnt_iterref++;
}
+ if (!locked)
+ mount_list_unlock();
+ return(retval);
+}
- /*
- * vnode is being terminated.
- * wait for vnode_pager_no_senders() to clear VTERMINATE
- */
- if (ISSET(vp->v_flag, VTERMINATE)) {
- SET(vp->v_flag, VTERMWANT);
- simple_unlock(&vp->v_interlock);
- (void)tsleep((caddr_t)&vp->v_ubcinfo, PINOD, "vclean", 0);
- return (ENOENT);
- }
+int
+mount_isdrained(mount_t mp, int locked)
+{
+ int retval;
- /*
- * if the vnode is being initialized,
- * wait for it to finish initialization
- */
- if (ISSET(vp->v_flag, VUINIT)) {
- if (ISSET(vp->v_flag, VUINIT)) {
- SET(vp->v_flag, VUWANT);
- simple_unlock(&vp->v_interlock);
- (void) tsleep((caddr_t)vp, PINOD, "vget2", 0);
- goto retry;
- }
- }
+ if (!locked)
+ mount_list_lock();
+ if (mp->mnt_iterref < 0)
+ retval = 1;
+ else
+ retval = 0;
+ if (!locked)
+ mount_list_unlock();
+ return(retval);
+}
- simple_lock(&vnode_free_list_slock);
- if (vp->v_usecount == 0) {
- /* If on the free list, remove it from there */
- if (VONLIST(vp))
- VREMFREE("vget", vp);
- } else {
- /* If on the inactive list, remove it from there */
- if ((vp->v_usecount == 1) && UBCINFOEXISTS(vp)) {
- if (VONLIST(vp))
- VREMINACTIVE("vget", vp);
- }
- }
+void
+mount_iterdrop(mount_t mp)
+{
+ mount_list_lock();
+ mp->mnt_iterref--;
+ wakeup(&mp->mnt_iterref);
+ mount_list_unlock();
+}
- /* The vnode should not be on the inactive list here */
- VINACTIVECHECK("vget", vp, 0);
+void
+mount_iterdrain(mount_t mp)
+{
+ mount_list_lock();
+ while (mp->mnt_iterref)
+ msleep((caddr_t)&mp->mnt_iterref, mnt_list_mtx_lock, PVFS, "mount_iterdrain", NULL);
+ /* mount iterations drained */
+ mp->mnt_iterref = -1;
+ mount_list_unlock();
+}
+void
+mount_iterreset(mount_t mp)
+{
+ mount_list_lock();
+ if (mp->mnt_iterref == -1)
+ mp->mnt_iterref = 0;
+ mount_list_unlock();
+}
- simple_unlock(&vnode_free_list_slock);
+/* always called with mount lock held */
+int
+mount_refdrain(mount_t mp)
+{
+ if (mp->mnt_lflag & MNT_LDRAIN)
+ panic("already in drain");
+ mp->mnt_lflag |= MNT_LDRAIN;
- if (++vp->v_usecount <= 0)
- panic("vget: v_usecount");
+ while (mp->mnt_count)
+ msleep((caddr_t)&mp->mnt_lflag, &mp->mnt_mlock, PVFS, "mount_drain", NULL);
- /*
- * Recover named reference as needed
- */
- if (UBCISVALID(vp) && !ubc_issetflags(vp, UI_HASOBJREF)) {
- simple_unlock(&vp->v_interlock);
- if (ubc_getobject(vp, UBC_HOLDOBJECT)) {
- error = ENOENT;
- goto errout;
- }
- simple_lock(&vp->v_interlock);
- }
+ if (mp->mnt_vnodelist.tqh_first != NULL)
+ panic("mount_refdrain: dangling vnode");
- if (flags & LK_TYPE_MASK) {
- if (error = vn_lock(vp, flags | LK_INTERLOCK, p))
- goto errout;
- return (0);
- }
+ mp->mnt_lflag &= ~MNT_LDRAIN;
- if ((flags & LK_INTERLOCK) == 0)
- simple_unlock(&vp->v_interlock);
- return (0);
+ return(0);
+}
-errout:
- /*
- * If the vnode was not active in the first place
- * must not call vrele() as VOP_INACTIVE() is not
- * required.
- * So inlined part of vrele() here.
- */
- simple_lock(&vp->v_interlock);
- if (--vp->v_usecount == 1) {
- if (UBCINFOEXISTS(vp)) {
- vinactive(vp);
- simple_unlock(&vp->v_interlock);
- return (error);
- }
- }
- if (vp->v_usecount > 0) {
- simple_unlock(&vp->v_interlock);
- return (error);
- }
- if (vp->v_usecount < 0)
- panic("vget: negative usecount (%d)", vp->v_usecount);
- vfree(vp);
- simple_unlock(&vp->v_interlock);
- return (error);
+/* Tags the mount point as not supportine extended readdir for NFS exports */
+void
+mount_set_noreaddirext(mount_t mp) {
+ mount_lock (mp);
+ mp->mnt_kern_flag |= MNTK_DENY_READDIREXT;
+ mount_unlock (mp);
}
/*
- * Get a pager reference on the particular vnode.
- *
- * This is called from ubc_info_init() and it is asumed that
- * the vnode is neither on the free list on on the inactive list.
- * It is also assumed that the vnode is neither being recycled
- * by vgonel nor being terminated by vnode_pager_vrele().
- *
- * The vnode interlock is NOT held by the caller.
+ * Mark a mount point as busy. Used to synchronize access and to delay
+ * unmounting.
*/
-__private_extern__ int
-vnode_pager_vget(vp)
- struct vnode *vp;
+int
+vfs_busy(mount_t mp, int flags)
{
- simple_lock(&vp->v_interlock);
- if (UBCINFOMISSING(vp))
- panic("vnode_pager_vget: stolen ubc_info");
- if (!UBCINFOEXISTS(vp))
- panic("vnode_pager_vget: lost ubc_info");
-
- if ((vp->v_flag & VXLOCK) || (vp->v_flag & VORECLAIM))
- panic("vnode_pager_vget: already being reclaimd");
-
- if (ISSET(vp->v_flag, VTERMINATE))
- panic("vnode_pager_vget: already being terminated");
+restart:
+ if (mp->mnt_lflag & MNT_LDEAD)
+ return(ENOENT);
- simple_lock(&vnode_free_list_slock);
- /* The vnode should not be on ANY list */
- if (VONLIST(vp))
- panic("vnode_pager_vget: still on the list");
+ if (mp->mnt_lflag & MNT_LUNMOUNT) {
+ if (flags & LK_NOWAIT)
+ return (ENOENT);
- /* The vnode should not be on the inactive list here */
- VINACTIVECHECK("vnode_pager_vget", vp, 0);
- simple_unlock(&vnode_free_list_slock);
+ mount_lock(mp);
- /* After all those checks, now do the real work :-) */
- if (++vp->v_usecount <= 0)
- panic("vnode_pager_vget: v_usecount");
- simple_unlock(&vp->v_interlock);
+ if (mp->mnt_lflag & MNT_LDEAD) {
+ mount_unlock(mp);
+ return(ENOENT);
+ }
+ if (mp->mnt_lflag & MNT_LUNMOUNT) {
+ mp->mnt_lflag |= MNT_LWAIT;
+ /*
+ * Since all busy locks are shared except the exclusive
+ * lock granted when unmounting, the only place that a
+ * wakeup needs to be done is at the release of the
+ * exclusive lock at the end of dounmount.
+ */
+ msleep((caddr_t)mp, &mp->mnt_mlock, (PVFS | PDROP), "vfsbusy", NULL);
+ return (ENOENT);
+ }
+ mount_unlock(mp);
+ }
- return (0);
-}
+ lck_rw_lock_shared(&mp->mnt_rwlock);
-/*
- * Stubs to use when there is no locking to be done on the underlying object.
- * A minimal shared lock is necessary to ensure that the underlying object
- * is not revoked while an operation is in progress. So, an active shared
- * count is maintained in an auxillary vnode lock structure.
- */
-int
-vop_nolock(ap)
- struct vop_lock_args /* {
- struct vnode *a_vp;
- int a_flags;
- struct proc *a_p;
- } */ *ap;
-{
-#ifdef notyet
- /*
- * This code cannot be used until all the non-locking filesystems
- * (notably NFS) are converted to properly lock and release nodes.
- * Also, certain vnode operations change the locking state within
- * the operation (create, mknod, remove, link, rename, mkdir, rmdir,
- * and symlink). Ideally these operations should not change the
- * lock state, but should be changed to let the caller of the
- * function unlock them. Otherwise all intermediate vnode layers
- * (such as union, umapfs, etc) must catch these functions to do
- * the necessary locking at their layer. Note that the inactive
- * and lookup operations also change their lock state, but this
- * cannot be avoided, so these two operations will always need
- * to be handled in intermediate layers.
- */
- struct vnode *vp = ap->a_vp;
- int vnflags, flags = ap->a_flags;
-
- if (vp->v_vnlock == NULL) {
- if ((flags & LK_TYPE_MASK) == LK_DRAIN)
- return (0);
- MALLOC_ZONE(vp->v_vnlock, struct lock__bsd__ *,
- sizeof(struct lock__bsd__), M_VNODE, M_WAITOK);
- lockinit(vp->v_vnlock, PVFS, "vnlock", 0, 0);
- }
- switch (flags & LK_TYPE_MASK) {
- case LK_DRAIN:
- vnflags = LK_DRAIN;
- break;
- case LK_EXCLUSIVE:
- case LK_SHARED:
- vnflags = LK_SHARED;
- break;
- case LK_UPGRADE:
- case LK_EXCLUPGRADE:
- case LK_DOWNGRADE:
- return (0);
- case LK_RELEASE:
- default:
- panic("vop_nolock: bad operation %d", flags & LK_TYPE_MASK);
- }
- if (flags & LK_INTERLOCK)
- vnflags |= LK_INTERLOCK;
- return(lockmgr(vp->v_vnlock, vnflags, &vp->v_interlock, ap->a_p));
-#else /* for now */
- /*
- * Since we are not using the lock manager, we must clear
- * the interlock here.
+ /*
+ * until we are granted the rwlock, it's possible for the mount point to
+ * change state, so reevaluate before granting the vfs_busy
*/
- if (ap->a_flags & LK_INTERLOCK)
- simple_unlock(&ap->a_vp->v_interlock);
+ if (mp->mnt_lflag & (MNT_LDEAD | MNT_LUNMOUNT)) {
+ lck_rw_done(&mp->mnt_rwlock);
+ goto restart;
+ }
return (0);
-#endif
}
/*
- * Decrement the active use count.
+ * Free a busy filesystem.
*/
-int
-vop_nounlock(ap)
- struct vop_unlock_args /* {
- struct vnode *a_vp;
- int a_flags;
- struct proc *a_p;
- } */ *ap;
-{
- struct vnode *vp = ap->a_vp;
- if (vp->v_vnlock == NULL)
- return (0);
- return (lockmgr(vp->v_vnlock, LK_RELEASE, NULL, ap->a_p));
+void
+vfs_unbusy(mount_t mp)
+{
+ lck_rw_done(&mp->mnt_rwlock);
}
-/*
- * Return whether or not the node is in use.
- */
-int
-vop_noislocked(ap)
- struct vop_islocked_args /* {
- struct vnode *a_vp;
- } */ *ap;
-{
- struct vnode *vp = ap->a_vp;
- if (vp->v_vnlock == NULL)
- return (0);
- return (lockstatus(vp->v_vnlock));
-}
-/*
- * Vnode reference.
- */
-void
-vref(vp)
- struct vnode *vp;
-{
+static void
+vfs_rootmountfailed(mount_t mp) {
- simple_lock(&vp->v_interlock);
- if (vp->v_usecount <= 0)
- panic("vref used where vget required");
+ mount_list_lock();
+ mp->mnt_vtable->vfc_refcount--;
+ mount_list_unlock();
- /* If on the inactive list, remove it from there */
- if ((vp->v_usecount == 1) && UBCINFOEXISTS(vp)) {
- if (VONLIST(vp)) {
- simple_lock(&vnode_free_list_slock);
- VREMINACTIVE("vref", vp);
- simple_unlock(&vnode_free_list_slock);
- }
- }
- /* The vnode should not be on the inactive list here */
- VINACTIVECHECK("vref", vp, 0);
+ vfs_unbusy(mp);
+
+ mount_lock_destroy(mp);
+
+#if CONFIG_MACF
+ mac_mount_label_destroy(mp);
+#endif
- if (++vp->v_usecount <= 0)
- panic("vref v_usecount");
- simple_unlock(&vp->v_interlock);
+ FREE_ZONE(mp, sizeof(struct mount), M_MOUNT);
}
/*
- * put the vnode on appropriate free list.
- * called with v_interlock held.
+ * Lookup a filesystem type, and if found allocate and initialize
+ * a mount structure for it.
+ *
+ * Devname is usually updated by mount(8) after booting.
*/
-static void
-vfree(vp)
- struct vnode *vp;
+static mount_t
+vfs_rootmountalloc_internal(struct vfstable *vfsp, const char *devname)
{
- /*
- * if the vnode is not obtained by calling getnewvnode() we
- * are not responsible for the cleanup. Just return.
- */
- if (!(vp->v_flag & VSTANDARD)) {
- return;
- }
-
- if (vp->v_usecount != 0)
- panic("vfree: v_usecount");
+ mount_t mp;
+
+ mp = _MALLOC_ZONE(sizeof(struct mount), M_MOUNT, M_WAITOK);
+ bzero((char *)mp, sizeof(struct mount));
+
+ /* Initialize the default IO constraints */
+ mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
+ mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;
+ mp->mnt_maxsegreadsize = mp->mnt_maxreadcnt;
+ mp->mnt_maxsegwritesize = mp->mnt_maxwritecnt;
+ mp->mnt_devblocksize = DEV_BSIZE;
+ mp->mnt_alignmentmask = PAGE_MASK;
+ mp->mnt_ioqueue_depth = MNT_DEFAULT_IOQUEUE_DEPTH;
+ mp->mnt_ioscale = 1;
+ mp->mnt_ioflags = 0;
+ mp->mnt_realrootvp = NULLVP;
+ mp->mnt_authcache_ttl = CACHED_LOOKUP_RIGHT_TTL;
+ mp->mnt_throttle_mask = LOWPRI_MAX_NUM_DEV - 1;
+ mp->mnt_devbsdunit = 0;
+
+ mount_lock_init(mp);
+ (void)vfs_busy(mp, LK_NOWAIT);
+
+ TAILQ_INIT(&mp->mnt_vnodelist);
+ TAILQ_INIT(&mp->mnt_workerqueue);
+ TAILQ_INIT(&mp->mnt_newvnodes);
+
+ mp->mnt_vtable = vfsp;
+ mp->mnt_op = vfsp->vfc_vfsops;
+ mp->mnt_flag = MNT_RDONLY | MNT_ROOTFS;
+ mp->mnt_vnodecovered = NULLVP;
+ //mp->mnt_stat.f_type = vfsp->vfc_typenum;
+ mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
- /* insert at tail of LRU list or at head if VAGE is set */
- simple_lock(&vnode_free_list_slock);
+ mount_list_lock();
+ vfsp->vfc_refcount++;
+ mount_list_unlock();
- if (VONLIST(vp))
- panic("vfree: vnode still on list");
+ strncpy(mp->mnt_vfsstat.f_fstypename, vfsp->vfc_name, MFSTYPENAMELEN);
+ mp->mnt_vfsstat.f_mntonname[0] = '/';
+ /* XXX const poisoning layering violation */
+ (void) copystr((const void *)devname, mp->mnt_vfsstat.f_mntfromname, MAXPATHLEN - 1, NULL);
- if (vp->v_flag & VAGE) {
- TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
- vp->v_flag &= ~VAGE;
- } else
- TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
- freevnodes++;
- simple_unlock(&vnode_free_list_slock);
- return;
+#if CONFIG_MACF
+ mac_mount_label_init(mp);
+ mac_mount_label_associate(vfs_context_kernel(), mp);
+#endif
+ return (mp);
}
-/*
- * put the vnode on the inactive list.
- * called with v_interlock held
- */
-static void
-vinactive(vp)
- struct vnode *vp;
+errno_t
+vfs_rootmountalloc(const char *fstypename, const char *devname, mount_t *mpp)
{
- if (!UBCINFOEXISTS(vp))
- panic("vinactive: not a UBC vnode");
-
- if (vp->v_usecount != 1)
- panic("vinactive: v_usecount");
+ struct vfstable *vfsp;
- simple_lock(&vnode_free_list_slock);
+ for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
+ if (!strncmp(vfsp->vfc_name, fstypename,
+ sizeof(vfsp->vfc_name)))
+ break;
+ if (vfsp == NULL)
+ return (ENODEV);
- if (VONLIST(vp))
- panic("vinactive: vnode still on list");
- VINACTIVECHECK("vinactive", vp, 0);
+ *mpp = vfs_rootmountalloc_internal(vfsp, devname);
- TAILQ_INSERT_TAIL(&vnode_inactive_list, vp, v_freelist);
- SET(vp->v_flag, VUINACTIVE);
- CLR(vp->v_flag, (VNOCACHE_DATA | VRAOFF));
+ if (*mpp)
+ return (0);
- inactivevnodes++;
- simple_unlock(&vnode_free_list_slock);
- return;
+ return (ENOMEM);
}
/*
- * vput(), just unlock and vrele()
+ * Find an appropriate filesystem to use for the root. If a filesystem
+ * has not been preselected, walk through the list of known filesystems
+ * trying those that have mountroot routines, and try them until one
+ * works or we have tried them all.
*/
-void
-vput(vp)
- struct vnode *vp;
+extern int (*mountroot)(void);
+
+int
+vfs_mountroot(void)
{
- struct proc *p = current_proc(); /* XXX */
+#if CONFIG_MACF
+ struct vnode *vp;
+#endif
+ struct vfstable *vfsp;
+ vfs_context_t ctx = vfs_context_kernel();
+ struct vfs_attr vfsattr;
+ int error;
+ mount_t mp;
+ vnode_t bdevvp_rootvp;
- simple_lock(&vp->v_interlock);
- if (--vp->v_usecount == 1) {
- if (UBCINFOEXISTS(vp)) {
- vinactive(vp);
- simple_unlock(&vp->v_interlock);
- VOP_UNLOCK(vp, 0, p);
- return;
- }
- }
- if (vp->v_usecount > 0) {
- simple_unlock(&vp->v_interlock);
- VOP_UNLOCK(vp, 0, p);
- return;
+ if (mountroot != NULL) {
+ /*
+ * used for netboot which follows a different set of rules
+ */
+ error = (*mountroot)();
+ return (error);
}
-#if DIAGNOSTIC
- if (vp->v_usecount < 0 || vp->v_writecount != 0) {
- vprint("vput: bad ref count", vp);
- panic("vput: v_usecount = %d, v_writecount = %d",
- vp->v_usecount, vp->v_writecount);
+ if ((error = bdevvp(rootdev, &rootvp))) {
+ printf("vfs_mountroot: can't setup bdevvp\n");
+ return (error);
}
-#endif
- if (ISSET((vp)->v_flag, VUINACTIVE) && VONLIST(vp))
- VREMINACTIVE("vrele", vp);
-
- simple_unlock(&vp->v_interlock);
- VOP_INACTIVE(vp, p);
/*
- * The interlock is not held and
- * VOP_INCATIVE releases the vnode lock.
- * We could block and the vnode might get reactivated
- * Can not just call vfree without checking the state
+ * 4951998 - code we call in vfc_mountroot may replace rootvp
+ * so keep a local copy for some house keeping.
*/
- simple_lock(&vp->v_interlock);
- if (!VONLIST(vp)) {
- if (vp->v_usecount == 0)
- vfree(vp);
- else if ((vp->v_usecount == 1) && UBCINFOEXISTS(vp))
- vinactive(vp);
- }
- simple_unlock(&vp->v_interlock);
-}
+ bdevvp_rootvp = rootvp;
-/*
- * Vnode release.
- * If count drops to zero, call inactive routine and return to freelist.
- */
-void
-vrele(vp)
- struct vnode *vp;
-{
- struct proc *p = current_proc(); /* XXX */
+ for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
+ if (vfsp->vfc_mountroot == NULL)
+ continue;
- simple_lock(&vp->v_interlock);
- if (--vp->v_usecount == 1) {
- if (UBCINFOEXISTS(vp)) {
- vinactive(vp);
- simple_unlock(&vp->v_interlock);
- return;
- }
- }
- if (vp->v_usecount > 0) {
- simple_unlock(&vp->v_interlock);
- return;
- }
-#if DIAGNOSTIC
- if (vp->v_usecount < 0 || vp->v_writecount != 0) {
- vprint("vrele: bad ref count", vp);
- panic("vrele: ref cnt");
- }
-#endif
- if (ISSET((vp)->v_flag, VUINACTIVE) && VONLIST(vp))
- VREMINACTIVE("vrele", vp);
+ mp = vfs_rootmountalloc_internal(vfsp, "root_device");
+ mp->mnt_devvp = rootvp;
+
+ if ((error = (*vfsp->vfc_mountroot)(mp, rootvp, ctx)) == 0) {
+ if ( bdevvp_rootvp != rootvp ) {
+ /*
+ * rootvp changed...
+ * bump the iocount and fix up mnt_devvp for the
+ * new rootvp (it will already have a usecount taken)...
+ * drop the iocount and the usecount on the orignal
+ * since we are no longer going to use it...
+ */
+ vnode_getwithref(rootvp);
+ mp->mnt_devvp = rootvp;
+
+ vnode_rele(bdevvp_rootvp);
+ vnode_put(bdevvp_rootvp);
+ }
+ mp->mnt_devvp->v_specflags |= SI_MOUNTEDON;
+ vfs_unbusy(mp);
- if ((vp->v_flag & VXLOCK) || (vp->v_flag & VORECLAIM)) {
- /* vnode is being cleaned, just return */
- vfree(vp);
- simple_unlock(&vp->v_interlock);
- return;
- }
+ mount_list_add(mp);
- if (vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, p) == 0) {
- VOP_INACTIVE(vp, p);
- /*
- * vn_lock releases the interlock and
- * VOP_INCATIVE releases the vnode lock.
- * We could block and the vnode might get reactivated
- * Can not just call vfree without checking the state
- */
- simple_lock(&vp->v_interlock);
- if (!VONLIST(vp)) {
- if (vp->v_usecount == 0)
- vfree(vp);
- else if ((vp->v_usecount == 1) && UBCINFOEXISTS(vp))
- vinactive(vp);
+ /*
+ * cache the IO attributes for the underlying physical media...
+ * an error return indicates the underlying driver doesn't
+ * support all the queries necessary... however, reasonable
+ * defaults will have been set, so no reason to bail or care
+ */
+ vfs_init_io_attributes(rootvp, mp);
+
+ /*
+ * Shadow the VFC_VFSNATIVEXATTR flag to MNTK_EXTENDED_ATTRS.
+ */
+ if (mp->mnt_vtable->vfc_vfsflags & VFC_VFSNATIVEXATTR) {
+ mp->mnt_kern_flag |= MNTK_EXTENDED_ATTRS;
+ }
+ if (mp->mnt_vtable->vfc_vfsflags & VFC_VFSPREFLIGHT) {
+ mp->mnt_kern_flag |= MNTK_UNMOUNT_PREFLIGHT;
+ }
+
+ /*
+ * Probe root file system for additional features.
+ */
+ (void)VFS_START(mp, 0, ctx);
+
+ VFSATTR_INIT(&vfsattr);
+ VFSATTR_WANTED(&vfsattr, f_capabilities);
+ if (vfs_getattr(mp, &vfsattr, ctx) == 0 &&
+ VFSATTR_IS_SUPPORTED(&vfsattr, f_capabilities)) {
+ if ((vfsattr.f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_EXTENDED_ATTR) &&
+ (vfsattr.f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_EXTENDED_ATTR)) {
+ mp->mnt_kern_flag |= MNTK_EXTENDED_ATTRS;
+ }
+#if NAMEDSTREAMS
+ if ((vfsattr.f_capabilities.capabilities[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_NAMEDSTREAMS) &&
+ (vfsattr.f_capabilities.valid[VOL_CAPABILITIES_INTERFACES] & VOL_CAP_INT_NAMEDSTREAMS)) {
+ mp->mnt_kern_flag |= MNTK_NAMED_STREAMS;
+ }
+#endif
+ if ((vfsattr.f_capabilities.capabilities[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_PATH_FROM_ID) &&
+ (vfsattr.f_capabilities.valid[VOL_CAPABILITIES_FORMAT] & VOL_CAP_FMT_PATH_FROM_ID)) {
+ mp->mnt_kern_flag |= MNTK_PATH_FROM_ID;
+ }
+ }
+
+ /*
+ * get rid of iocount reference returned
+ * by bdevvp (or picked up by us on the substitued
+ * rootvp)... it (or we) will have also taken
+ * a usecount reference which we want to keep
+ */
+ vnode_put(rootvp);
+
+#if CONFIG_MACF
+ if ((vfs_flags(mp) & MNT_MULTILABEL) == 0)
+ return (0);
+
+ error = VFS_ROOT(mp, &vp, ctx);
+ if (error) {
+ printf("%s() VFS_ROOT() returned %d\n",
+ __func__, error);
+ dounmount(mp, MNT_FORCE, 0, ctx);
+ goto fail;
+ }
+ error = vnode_label(mp, NULL, vp, NULL, 0, ctx);
+ /*
+ * get rid of reference provided by VFS_ROOT
+ */
+ vnode_put(vp);
+
+ if (error) {
+ printf("%s() vnode_label() returned %d\n",
+ __func__, error);
+ dounmount(mp, MNT_FORCE, 0, ctx);
+ goto fail;
+ }
+#endif
+ return (0);
}
- simple_unlock(&vp->v_interlock);
- }
-#if 0
- else {
- vfree(vp);
- simple_unlock(&vp->v_interlock);
- kprintf("vrele: vn_lock() failed for vp = 0x%08x\n", vp);
- }
+#if CONFIG_MACF
+fail:
#endif
+ vfs_rootmountfailed(mp);
+
+ if (error != EINVAL)
+ printf("%s_mountroot failed: %d\n", vfsp->vfc_name, error);
+ }
+ return (ENODEV);
}
-void
-vagevp(vp)
- struct vnode *vp;
+/*
+ * Lookup a mount point by filesystem identifier.
+ */
+
+struct mount *
+vfs_getvfs(fsid_t *fsid)
{
- simple_lock(&vp->v_interlock);
- vp->v_flag |= VAGE;
- simple_unlock(&vp->v_interlock);
- return;
+ return (mount_list_lookupby_fsid(fsid, 0, 0));
}
-/*
- * Page or buffer structure gets a reference.
- */
-void
-vhold(vp)
- register struct vnode *vp;
+static struct mount *
+vfs_getvfs_locked(fsid_t *fsid)
{
+ return(mount_list_lookupby_fsid(fsid, 1, 0));
+}
- simple_lock(&vp->v_interlock);
- vp->v_holdcnt++;
- simple_unlock(&vp->v_interlock);
+struct mount *
+vfs_getvfs_by_mntonname(char *path)
+{
+ mount_t retmp = (mount_t)0;
+ mount_t mp;
+
+ mount_list_lock();
+ TAILQ_FOREACH(mp, &mountlist, mnt_list) {
+ if (!strncmp(mp->mnt_vfsstat.f_mntonname, path,
+ sizeof(mp->mnt_vfsstat.f_mntonname))) {
+ retmp = mp;
+ if (mount_iterref(retmp, 1))
+ retmp = NULL;
+ goto out;
+ }
+ }
+out:
+ mount_list_unlock();
+ return (retmp);
}
+/* generation number for creation of new fsids */
+u_short mntid_gen = 0;
/*
- * Page or buffer structure frees a reference.
+ * Get a new unique fsid
*/
void
-holdrele(vp)
- register struct vnode *vp;
+vfs_getnewfsid(struct mount *mp)
{
- simple_lock(&vp->v_interlock);
- if (vp->v_holdcnt <= 0)
- panic("holdrele: holdcnt");
- vp->v_holdcnt--;
- simple_unlock(&vp->v_interlock);
-}
-
-/*
- * Remove any vnodes in the vnode table belonging to mount point mp.
- *
- * If MNT_NOFORCE is specified, there should not be any active ones,
- * return error if any are found (nb: this is a user error, not a
- * system error). If MNT_FORCE is specified, detach any active vnodes
- * that are found.
- */
-#if DIAGNOSTIC
-int busyprt = 0; /* print out busy vnodes */
-#if 0
-struct ctldebug debug1 = { "busyprt", &busyprt };
-#endif /* 0 */
-#endif
+ fsid_t tfsid;
+ int mtype;
+ mount_t nmp;
-int
-vflush(mp, skipvp, flags)
- struct mount *mp;
- struct vnode *skipvp;
- int flags;
-{
- struct proc *p = current_proc();
- struct vnode *vp, *nvp;
- int busy = 0;
+ mount_list_lock();
- simple_lock(&mntvnode_slock);
-loop:
- for (vp = mp->mnt_vnodelist.lh_first; vp; vp = nvp) {
- if (vp->v_mount != mp)
- goto loop;
- nvp = vp->v_mntvnodes.le_next;
- /*
- * Skip over a selected vnode.
- */
- if (vp == skipvp)
- continue;
+ /* generate a new fsid */
+ mtype = mp->mnt_vtable->vfc_typenum;
+ if (++mntid_gen == 0)
+ mntid_gen++;
+ tfsid.val[0] = makedev(nblkdev + mtype, mntid_gen);
+ tfsid.val[1] = mtype;
- simple_lock(&vp->v_interlock);
- /*
- * Skip over a vnodes marked VSYSTEM or VNOFLUSH.
- */
- if ((flags & SKIPSYSTEM) && ((vp->v_flag & VSYSTEM) || (vp->v_flag & VNOFLUSH))) {
- simple_unlock(&vp->v_interlock);
- continue;
- }
- /*
- * Skip over a vnodes marked VSWAP.
- */
- if ((flags & SKIPSWAP) && (vp->v_flag & VSWAP)) {
- simple_unlock(&vp->v_interlock);
- continue;
- }
- /*
- * If WRITECLOSE is set, only flush out regular file
- * vnodes open for writing.
- */
- if ((flags & WRITECLOSE) &&
- (vp->v_writecount == 0 || vp->v_type != VREG)) {
- simple_unlock(&vp->v_interlock);
- continue;
- }
- /*
- * With v_usecount == 0, all we need to do is clear
- * out the vnode data structures and we are done.
- */
- if (vp->v_usecount == 0) {
- simple_unlock(&mntvnode_slock);
- vgonel(vp, p);
- simple_lock(&mntvnode_slock);
- continue;
- }
- /*
- * If FORCECLOSE is set, forcibly close the vnode.
- * For block or character devices, revert to an
- * anonymous device. For all other files, just kill them.
- */
- if (flags & FORCECLOSE) {
- simple_unlock(&mntvnode_slock);
- if (vp->v_type != VBLK && vp->v_type != VCHR) {
- vgonel(vp, p);
- } else {
- vclean(vp, 0, p);
- vp->v_op = spec_vnodeop_p;
- insmntque(vp, (struct mount *)0);
- }
- simple_lock(&mntvnode_slock);
- continue;
+ TAILQ_FOREACH(nmp, &mountlist, mnt_list) {
+ while (vfs_getvfs_locked(&tfsid)) {
+ if (++mntid_gen == 0)
+ mntid_gen++;
+ tfsid.val[0] = makedev(nblkdev + mtype, mntid_gen);
}
-#if DIAGNOSTIC
- if (busyprt)
- vprint("vflush: busy vnode", vp);
-#endif
- simple_unlock(&vp->v_interlock);
- busy++;
}
- simple_unlock(&mntvnode_slock);
- if (busy && ((flags & FORCECLOSE)==0))
- return (EBUSY);
- return (0);
+ mp->mnt_vfsstat.f_fsid.val[0] = tfsid.val[0];
+ mp->mnt_vfsstat.f_fsid.val[1] = tfsid.val[1];
+ mount_list_unlock();
}
/*
- * Disassociate the underlying file system from a vnode.
- * The vnode interlock is held on entry.
+ * Routines having to do with the management of the vnode table.
+ */
+extern int (**dead_vnodeop_p)(void *);
+long numvnodes, freevnodes, deadvnodes;
+
+
+/*
+ * Move a vnode from one mount queue to another.
*/
static void
-vclean(vp, flags, p)
- struct vnode *vp;
- int flags;
- struct proc *p;
+insmntque(vnode_t vp, mount_t mp)
{
- int active;
- int removed = 0;
- int didhold;
-
+ mount_t lmp;
/*
- * if the vnode is not obtained by calling getnewvnode() we
- * are not responsible for the cleanup. Just return.
+ * Delete from old mount point vnode list, if on one.
*/
- if (!(vp->v_flag & VSTANDARD)) {
- simple_unlock(&vp->v_interlock);
+ if ( (lmp = vp->v_mount) != NULL && lmp != dead_mountp) {
+ if ((vp->v_lflag & VNAMED_MOUNT) == 0)
+ panic("insmntque: vp not in mount vnode list");
+ vp->v_lflag &= ~VNAMED_MOUNT;
+
+ mount_lock_spin(lmp);
+
+ mount_drop(lmp, 1);
+
+ if (vp->v_mntvnodes.tqe_next == NULL) {
+ if (TAILQ_LAST(&lmp->mnt_vnodelist, vnodelst) == vp)
+ TAILQ_REMOVE(&lmp->mnt_vnodelist, vp, v_mntvnodes);
+ else if (TAILQ_LAST(&lmp->mnt_newvnodes, vnodelst) == vp)
+ TAILQ_REMOVE(&lmp->mnt_newvnodes, vp, v_mntvnodes);
+ else if (TAILQ_LAST(&lmp->mnt_workerqueue, vnodelst) == vp)
+ TAILQ_REMOVE(&lmp->mnt_workerqueue, vp, v_mntvnodes);
+ } else {
+ vp->v_mntvnodes.tqe_next->v_mntvnodes.tqe_prev = vp->v_mntvnodes.tqe_prev;
+ *vp->v_mntvnodes.tqe_prev = vp->v_mntvnodes.tqe_next;
+ }
+ vp->v_mntvnodes.tqe_next = NULL;
+ vp->v_mntvnodes.tqe_prev = NULL;
+ mount_unlock(lmp);
return;
}
/*
- * Check to see if the vnode is in use.
- * If so we have to reference it before we clean it out
- * so that its count cannot fall to zero and generate a
- * race against ourselves to recycle it.
- */
- if (active = vp->v_usecount)
- if (++vp->v_usecount <= 0)
- panic("vclean: v_usecount");
- /*
- * Prevent the vnode from being recycled or
- * brought into use while we clean it out.
+ * Insert into list of vnodes for the new mount point, if available.
*/
- if (vp->v_flag & VXLOCK)
- panic("vclean: deadlock");
- vp->v_flag |= VXLOCK;
+ if ((vp->v_mount = mp) != NULL) {
+ mount_lock_spin(mp);
+ if ((vp->v_mntvnodes.tqe_next != 0) && (vp->v_mntvnodes.tqe_prev != 0))
+ panic("vp already in mount list");
+ if (mp->mnt_lflag & MNT_LITER)
+ TAILQ_INSERT_HEAD(&mp->mnt_newvnodes, vp, v_mntvnodes);
+ else
+ TAILQ_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes);
+ if (vp->v_lflag & VNAMED_MOUNT)
+ panic("insmntque: vp already in mount vnode list");
+ vp->v_lflag |= VNAMED_MOUNT;
+ mount_ref(mp, 1);
+ mount_unlock(mp);
+ }
+}
- /*
- * Even if the count is zero, the VOP_INACTIVE routine may still
- * have the object locked while it cleans it out. The VOP_LOCK
- * ensures that the VOP_INACTIVE routine is done with its work.
- * For active vnodes, it ensures that no other activity can
- * occur while the underlying object is being cleaned out.
- */
- VOP_LOCK(vp, LK_DRAIN | LK_INTERLOCK, p);
- /*
- * if this vnode is on the inactive list
- * take it off the list.
- */
- if ((active == 1) &&
- (ISSET((vp)->v_flag, VUINACTIVE) && VONLIST(vp))) {
- simple_lock(&vnode_free_list_slock);
- VREMINACTIVE("vclean", vp);
- simple_unlock(&vnode_free_list_slock);
- removed++;
+/*
+ * Create a vnode for a block device.
+ * Used for root filesystem, argdev, and swap areas.
+ * Also used for memory file system special devices.
+ */
+int
+bdevvp(dev_t dev, vnode_t *vpp)
+{
+ vnode_t nvp;
+ int error;
+ struct vnode_fsparam vfsp;
+ struct vfs_context context;
+
+ if (dev == NODEV) {
+ *vpp = NULLVP;
+ return (ENODEV);
}
- /* Clean the pages in VM. */
- if (active && (flags & DOCLOSE))
- VOP_CLOSE(vp, IO_NDELAY, NOCRED, p);
+ context.vc_thread = current_thread();
+ context.vc_ucred = FSCRED;
- /* Clean the pages in VM. */
- didhold = ubc_hold(vp);
- if ((active) && (didhold))
- (void)ubc_clean(vp, 0); /* do not invalidate */
+ vfsp.vnfs_mp = (struct mount *)0;
+ vfsp.vnfs_vtype = VBLK;
+ vfsp.vnfs_str = "bdevvp";
+ vfsp.vnfs_dvp = NULL;
+ vfsp.vnfs_fsnode = NULL;
+ vfsp.vnfs_cnp = NULL;
+ vfsp.vnfs_vops = spec_vnodeop_p;
+ vfsp.vnfs_rdev = dev;
+ vfsp.vnfs_filesize = 0;
- /*
- * Clean out any buffers associated with the vnode.
- */
- if (flags & DOCLOSE) {
- if (vp->v_tag == VT_NFS)
- nfs_vinvalbuf(vp, V_SAVE, NOCRED, p, 0);
- else
- vinvalbuf(vp, V_SAVE, NOCRED, p, 0, 0);
- }
+ vfsp.vnfs_flags = VNFS_NOCACHE | VNFS_CANTCACHE;
- if (active)
- VOP_INACTIVE(vp, p);
- else
- VOP_UNLOCK(vp, 0, p);
+ vfsp.vnfs_marksystem = 0;
+ vfsp.vnfs_markroot = 0;
- /* Destroy ubc named reference */
- if (didhold) {
- ubc_rele(vp);
- ubc_destroy_named(vp);
+ if ( (error = vnode_create(VNCREATE_FLAVOR, VCREATESIZE, &vfsp, &nvp)) ) {
+ *vpp = NULLVP;
+ return (error);
}
-
- /*
- * Reclaim the vnode.
- */
- if (VOP_RECLAIM(vp, p))
- panic("vclean: cannot reclaim");
- cache_purge(vp);
- if (vp->v_vnlock) {
- if ((vp->v_vnlock->lk_flags & LK_DRAINED) == 0)
- vprint("vclean: lock not drained", vp);
- FREE_ZONE(vp->v_vnlock, sizeof (struct lock__bsd__), M_VNODE);
- vp->v_vnlock = NULL;
+ vnode_lock_spin(nvp);
+ nvp->v_flag |= VBDEVVP;
+ nvp->v_tag = VT_NON; /* set this to VT_NON so during aliasing it can be replaced */
+ vnode_unlock(nvp);
+ if ( (error = vnode_ref(nvp)) ) {
+ panic("bdevvp failed: vnode_ref");
+ return (error);
+ }
+ if ( (error = VNOP_FSYNC(nvp, MNT_WAIT, &context)) ) {
+ panic("bdevvp failed: fsync");
+ return (error);
+ }
+ if ( (error = buf_invalidateblks(nvp, BUF_WRITE_DATA, 0, 0)) ) {
+ panic("bdevvp failed: invalidateblks");
+ return (error);
}
- /* It's dead, Jim! */
- vp->v_op = dead_vnodeop_p;
- vp->v_tag = VT_NON;
-
- /*
- * Done with purge, notify sleepers of the grim news.
+#if CONFIG_MACF
+ /*
+ * XXXMAC: We can't put a MAC check here, the system will
+ * panic without this vnode.
*/
- vp->v_flag &= ~VXLOCK;
- if (vp->v_flag & VXWANT) {
- vp->v_flag &= ~VXWANT;
- wakeup((caddr_t)vp);
+#endif /* MAC */
+
+ if ( (error = VNOP_OPEN(nvp, FREAD, &context)) ) {
+ panic("bdevvp failed: open");
+ return (error);
}
+ *vpp = nvp;
- if (active)
- vrele(vp);
+ return (0);
}
/*
- * Eliminate all activity associated with the requested vnode
- * and with all vnodes aliased to the requested vnode.
+ * Check to see if the new vnode represents a special device
+ * for which we already have a vnode (either because of
+ * bdevvp() or because of a different vnode representing
+ * the same block device). If such an alias exists, deallocate
+ * the existing contents and return the aliased vnode. The
+ * caller is responsible for filling it with its new contents.
*/
-int
-vop_revoke(ap)
- struct vop_revoke_args /* {
- struct vnode *a_vp;
- int a_flags;
- } */ *ap;
+static vnode_t
+checkalias(struct vnode *nvp, dev_t nvp_rdev)
{
- struct vnode *vp, *vq;
- struct proc *p = current_proc();
+ struct vnode *vp;
+ struct vnode **vpp;
+ struct specinfo *sin = NULL;
+ int vid = 0;
-#if DIAGNOSTIC
- if ((ap->a_flags & REVOKEALL) == 0)
- panic("vop_revoke");
-#endif
+ vpp = &speclisth[SPECHASH(nvp_rdev)];
+loop:
+ SPECHASH_LOCK();
- vp = ap->a_vp;
- simple_lock(&vp->v_interlock);
+ for (vp = *vpp; vp; vp = vp->v_specnext) {
+ if (nvp_rdev == vp->v_rdev && nvp->v_type == vp->v_type) {
+ vid = vp->v_id;
+ break;
+ }
+ }
+ SPECHASH_UNLOCK();
- if (vp->v_flag & VALIASED) {
- /*
- * If a vgone (or vclean) is already in progress,
- * wait until it is done and return.
- */
- if (vp->v_flag & VXLOCK) {
- while (vp->v_flag & VXLOCK) {
- vp->v_flag |= VXWANT;
- simple_unlock(&vp->v_interlock);
- (void)tsleep((caddr_t)vp, PINOD, "vop_revokeall", 0);
- }
- return (0);
+ if (vp) {
+found_alias:
+ if (vnode_getwithvid(vp,vid)) {
+ goto loop;
}
/*
- * Ensure that vp will not be vgone'd while we
- * are eliminating its aliases.
+ * Termination state is checked in vnode_getwithvid
*/
- vp->v_flag |= VXLOCK;
- simple_unlock(&vp->v_interlock);
- while (vp->v_flag & VALIASED) {
- simple_lock(&spechash_slock);
- for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
- if (vq->v_rdev != vp->v_rdev ||
- vq->v_type != vp->v_type || vp == vq)
- continue;
- simple_unlock(&spechash_slock);
- vgone(vq);
- break;
- }
- if (vq == NULLVP)
- simple_unlock(&spechash_slock);
- }
+ vnode_lock(vp);
+
/*
- * Remove the lock so that vgone below will
- * really eliminate the vnode after which time
- * vgone will awaken any sleepers.
+ * Alias, but not in use, so flush it out.
*/
- simple_lock(&vp->v_interlock);
- vp->v_flag &= ~VXLOCK;
+ if ((vp->v_iocount == 1) && (vp->v_usecount == 0)) {
+ vnode_reclaim_internal(vp, 1, 1, 0);
+ vnode_put_locked(vp);
+ vnode_unlock(vp);
+ goto loop;
+ }
+
}
- vgonel(vp, p);
- return (0);
-}
-
-/*
- * Recycle an unused vnode to the front of the free list.
- * Release the passed interlock if the vnode will be recycled.
- */
-int
-vrecycle(vp, inter_lkp, p)
- struct vnode *vp;
- struct slock *inter_lkp;
- struct proc *p;
-{
+ if (vp == NULL || vp->v_tag != VT_NON) {
+ if (sin == NULL) {
+ MALLOC_ZONE(sin, struct specinfo *, sizeof(struct specinfo),
+ M_SPECINFO, M_WAITOK);
+ }
- simple_lock(&vp->v_interlock);
- if (vp->v_usecount == 0) {
- if (inter_lkp)
- simple_unlock(inter_lkp);
- vgonel(vp, p);
- return (1);
+ nvp->v_specinfo = sin;
+ bzero(nvp->v_specinfo, sizeof(struct specinfo));
+ nvp->v_rdev = nvp_rdev;
+ nvp->v_specflags = 0;
+ nvp->v_speclastr = -1;
+ nvp->v_specinfo->si_opencount = 0;
+
+ SPECHASH_LOCK();
+
+ /* We dropped the lock, someone could have added */
+ if (vp == NULLVP) {
+ for (vp = *vpp; vp; vp = vp->v_specnext) {
+ if (nvp_rdev == vp->v_rdev && nvp->v_type == vp->v_type) {
+ vid = vp->v_id;
+ SPECHASH_UNLOCK();
+ goto found_alias;
+ }
+ }
+ }
+
+ nvp->v_hashchain = vpp;
+ nvp->v_specnext = *vpp;
+ *vpp = nvp;
+
+ if (vp != NULLVP) {
+ nvp->v_specflags |= SI_ALIASED;
+ vp->v_specflags |= SI_ALIASED;
+ SPECHASH_UNLOCK();
+ vnode_put_locked(vp);
+ vnode_unlock(vp);
+ } else {
+ SPECHASH_UNLOCK();
+ }
+
+ return (NULLVP);
}
- simple_unlock(&vp->v_interlock);
- return (0);
+
+ if (sin) {
+ FREE_ZONE(sin, sizeof(struct specinfo), M_SPECINFO);
+ }
+
+ if ((vp->v_flag & (VBDEVVP | VDEVFLUSH)) != 0)
+ return(vp);
+
+ panic("checkalias with VT_NON vp that shouldn't: %p", vp);
+
+ return (vp);
+}
+
+
+/*
+ * Get a reference on a particular vnode and lock it if requested.
+ * If the vnode was on the inactive list, remove it from the list.
+ * If the vnode was on the free list, remove it from the list and
+ * move it to inactive list as needed.
+ * The vnode lock bit is set if the vnode is being eliminated in
+ * vgone. The process is awakened when the transition is completed,
+ * and an error returned to indicate that the vnode is no longer
+ * usable (possibly having been changed to a new file system type).
+ */
+int
+vget_internal(vnode_t vp, int vid, int vflags)
+{
+ int error = 0;
+
+ vnode_lock_spin(vp);
+
+ if ((vflags & VNODE_WRITEABLE) && (vp->v_writecount == 0))
+ /*
+ * vnode to be returned only if it has writers opened
+ */
+ error = EINVAL;
+ else
+ error = vnode_getiocount(vp, vid, vflags);
+
+ vnode_unlock(vp);
+
+ return (error);
}
/*
- * Eliminate all activity associated with a vnode
- * in preparation for reuse.
+ * Returns: 0 Success
+ * ENOENT No such file or directory [terminating]
*/
-void
-vgone(vp)
- struct vnode *vp;
+int
+vnode_ref(vnode_t vp)
{
- struct proc *p = current_proc();
- simple_lock(&vp->v_interlock);
- vgonel(vp, p);
+ return (vnode_ref_ext(vp, 0, 0));
}
/*
- * vgone, with the vp interlock held.
+ * Returns: 0 Success
+ * ENOENT No such file or directory [terminating]
*/
-void
-vgonel(vp, p)
- struct vnode *vp;
- struct proc *p;
+int
+vnode_ref_ext(vnode_t vp, int fmode, int flags)
{
- struct vnode *vq;
- struct vnode *vx;
+ int error = 0;
+
+ vnode_lock_spin(vp);
/*
- * if the vnode is not obtained by calling getnewvnode() we
- * are not responsible for the cleanup. Just return.
+ * once all the current call sites have been fixed to insure they have
+ * taken an iocount, we can toughen this assert up and insist that the
+ * iocount is non-zero... a non-zero usecount doesn't insure correctness
*/
- if (!(vp->v_flag & VSTANDARD)) {
- simple_unlock(&vp->v_interlock);
- return;
- }
+ if (vp->v_iocount <= 0 && vp->v_usecount <= 0)
+ panic("vnode_ref_ext: vp %p has no valid reference %d, %d", vp, vp->v_iocount, vp->v_usecount);
/*
- * If a vgone (or vclean) is already in progress,
- * wait until it is done and return.
+ * if you are the owner of drain/termination, can acquire usecount
*/
- if (vp->v_flag & VXLOCK) {
- while (vp->v_flag & VXLOCK) {
- vp->v_flag |= VXWANT;
- simple_unlock(&vp->v_interlock);
- (void)tsleep((caddr_t)vp, PINOD, "vgone", 0);
+ if ((flags & VNODE_REF_FORCE) == 0) {
+ if ((vp->v_lflag & (VL_DRAIN | VL_TERMINATE | VL_DEAD))) {
+ if (vp->v_owner != current_thread()) {
+ error = ENOENT;
+ goto out;
+ }
}
- return;
}
- /*
- * Clean out the filesystem specific data.
- */
- vclean(vp, DOCLOSE, p);
- /*
- * Delete from old mount point vnode list, if on one.
- */
- if (vp->v_mount != NULL)
- insmntque(vp, (struct mount *)0);
- /*
- * If special device, remove it from special device alias list
- * if it is on one.
- */
- if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_specinfo != 0) {
- simple_lock(&spechash_slock);
- if (*vp->v_hashchain == vp) {
- *vp->v_hashchain = vp->v_specnext;
- } else {
- for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
- if (vq->v_specnext != vp)
- continue;
- vq->v_specnext = vp->v_specnext;
- break;
- }
- if (vq == NULL)
- panic("missing bdev");
+ vp->v_usecount++;
+
+ if (fmode & FWRITE) {
+ if (++vp->v_writecount <= 0)
+ panic("vnode_ref_ext: v_writecount");
+ }
+ if (fmode & O_EVTONLY) {
+ if (++vp->v_kusecount <= 0)
+ panic("vnode_ref_ext: v_kusecount");
+ }
+ if (vp->v_flag & VRAGE) {
+ struct uthread *ut;
+
+ ut = get_bsdthread_info(current_thread());
+
+ if ( !(current_proc()->p_lflag & P_LRAGE_VNODES) &&
+ !(ut->uu_flag & UT_RAGE_VNODES)) {
+ /*
+ * a 'normal' process accessed this vnode
+ * so make sure its no longer marked
+ * for rapid aging... also, make sure
+ * it gets removed from the rage list...
+ * when v_usecount drops back to 0, it
+ * will be put back on the real free list
+ */
+ vp->v_flag &= ~VRAGE;
+ vp->v_references = 0;
+ vnode_list_remove(vp);
}
- if (vp->v_flag & VALIASED) {
- vx = NULL;
- for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
- if (vq->v_rdev != vp->v_rdev ||
- vq->v_type != vp->v_type)
- continue;
- if (vx)
- break;
- vx = vq;
- }
- if (vx == NULL)
- panic("missing alias");
- if (vq == NULL)
- vx->v_flag &= ~VALIASED;
- vp->v_flag &= ~VALIASED;
- }
- simple_unlock(&spechash_slock);
- FREE_ZONE(vp->v_specinfo, sizeof (struct specinfo), M_VNODE);
- vp->v_specinfo = NULL;
- }
- /*
- * If it is on the freelist and not already at the head,
- * move it to the head of the list. The test of the back
- * pointer and the reference count of zero is because
- * it will be removed from the free list by getnewvnode,
- * but will not have its reference count incremented until
- * after calling vgone. If the reference count were
- * incremented first, vgone would (incorrectly) try to
- * close the previous instance of the underlying object.
- * So, the back pointer is explicitly set to `0xdeadb' in
- * getnewvnode after removing it from the freelist to ensure
- * that we do not try to move it here.
- */
- if (vp->v_usecount == 0) {
- simple_lock(&vnode_free_list_slock);
- if ((vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb) &&
- vnode_free_list.tqh_first != vp) {
- TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
- TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
- }
- simple_unlock(&vnode_free_list_slock);
}
- vp->v_type = VBAD;
+ if (vp->v_usecount == 1 && vp->v_type == VREG && !(vp->v_flag & VSYSTEM)) {
+
+ if (vp->v_ubcinfo) {
+ vnode_lock_convert(vp);
+ memory_object_mark_used(vp->v_ubcinfo->ui_control);
+ }
+ }
+out:
+ vnode_unlock(vp);
+
+ return (error);
}
+
/*
- * Lookup a vnode by device number.
+ * put the vnode on appropriate free list.
+ * called with vnode LOCKED
*/
-int
-vfinddev(dev, type, vpp)
- dev_t dev;
- enum vtype type;
- struct vnode **vpp;
+static void
+vnode_list_add(vnode_t vp)
{
- struct vnode *vp;
- int rc = 0;
+#if DIAGNOSTIC
+ lck_mtx_assert(&vp->v_lock, LCK_MTX_ASSERT_OWNED);
+#endif
+ /*
+ * if it is already on a list or non zero references return
+ */
+ if (VONLIST(vp) || (vp->v_usecount != 0) || (vp->v_iocount != 0) || (vp->v_lflag & VL_TERMINATE))
+ return;
- simple_lock(&spechash_slock);
- for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) {
- if (dev != vp->v_rdev || type != vp->v_type)
- continue;
- *vpp = vp;
- rc = 1;
- break;
+ vnode_list_lock();
+
+ if ((vp->v_flag & VRAGE) && !(vp->v_lflag & VL_DEAD)) {
+ /*
+ * add the new guy to the appropriate end of the RAGE list
+ */
+ if ((vp->v_flag & VAGE))
+ TAILQ_INSERT_HEAD(&vnode_rage_list, vp, v_freelist);
+ else
+ TAILQ_INSERT_TAIL(&vnode_rage_list, vp, v_freelist);
+
+ vp->v_listflag |= VLIST_RAGE;
+ ragevnodes++;
+
+ /*
+ * reset the timestamp for the last inserted vp on the RAGE
+ * queue to let new_vnode know that its not ok to start stealing
+ * from this list... as long as we're actively adding to this list
+ * we'll push out the vnodes we want to donate to the real free list
+ * once we stop pushing, we'll let some time elapse before we start
+ * stealing them in the new_vnode routine
+ */
+ microuptime(&rage_tv);
+ } else {
+ /*
+ * if VL_DEAD, insert it at head of the dead list
+ * else insert at tail of LRU list or at head if VAGE is set
+ */
+ if ( (vp->v_lflag & VL_DEAD)) {
+ TAILQ_INSERT_HEAD(&vnode_dead_list, vp, v_freelist);
+ vp->v_listflag |= VLIST_DEAD;
+ deadvnodes++;
+ } else if ((vp->v_flag & VAGE)) {
+ TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
+ vp->v_flag &= ~VAGE;
+ freevnodes++;
+ } else {
+ TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
+ freevnodes++;
+ }
}
- simple_unlock(&spechash_slock);
- return (rc);
+ vnode_list_unlock();
}
+
/*
- * Calculate the total number of references to a special device.
+ * remove the vnode from appropriate free list.
+ * called with vnode LOCKED and
+ * the list lock held
*/
-int
-vcount(vp)
- struct vnode *vp;
+static void
+vnode_list_remove_locked(vnode_t vp)
{
- struct vnode *vq, *vnext;
- int count;
-
-loop:
- if ((vp->v_flag & VALIASED) == 0)
- return (vp->v_usecount);
- simple_lock(&spechash_slock);
- for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) {
- vnext = vq->v_specnext;
- if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type)
- continue;
+ if (VONLIST(vp)) {
/*
- * Alias, but not in use, so flush it out.
+ * the v_listflag field is
+ * protected by the vnode_list_lock
*/
- if (vq->v_usecount == 0 && vq != vp) {
- simple_unlock(&spechash_slock);
- vgone(vq);
- goto loop;
- }
- count += vq->v_usecount;
+ if (vp->v_listflag & VLIST_RAGE)
+ VREMRAGE("vnode_list_remove", vp);
+ else if (vp->v_listflag & VLIST_DEAD)
+ VREMDEAD("vnode_list_remove", vp);
+ else
+ VREMFREE("vnode_list_remove", vp);
}
- simple_unlock(&spechash_slock);
- return (count);
}
-int prtactive = 0; /* 1 => print out reclaim of active vnodes */
/*
- * Print out a description of a vnode.
+ * remove the vnode from appropriate free list.
+ * called with vnode LOCKED
*/
-static char *typename[] =
- { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" };
+static void
+vnode_list_remove(vnode_t vp)
+{
+#if DIAGNOSTIC
+ lck_mtx_assert(&vp->v_lock, LCK_MTX_ASSERT_OWNED);
+#endif
+ /*
+ * we want to avoid taking the list lock
+ * in the case where we're not on the free
+ * list... this will be true for most
+ * directories and any currently in use files
+ *
+ * we're guaranteed that we can't go from
+ * the not-on-list state to the on-list
+ * state since we hold the vnode lock...
+ * all calls to vnode_list_add are done
+ * under the vnode lock... so we can
+ * check for that condition (the prevelant one)
+ * without taking the list lock
+ */
+ if (VONLIST(vp)) {
+ vnode_list_lock();
+ /*
+ * however, we're not guaranteed that
+ * we won't go from the on-list state
+ * to the not-on-list state until we
+ * hold the vnode_list_lock... this
+ * is due to "new_vnode" removing vnodes
+ * from the free list uder the list_lock
+ * w/o the vnode lock... so we need to
+ * check again whether we're currently
+ * on the free list
+ */
+ vnode_list_remove_locked(vp);
+
+ vnode_list_unlock();
+ }
+}
+
void
-vprint(label, vp)
- char *label;
- register struct vnode *vp;
+vnode_rele(vnode_t vp)
{
- char buf[64];
+ vnode_rele_internal(vp, 0, 0, 0);
+}
- if (label != NULL)
- printf("%s: ", label);
- printf("type %s, usecount %d, writecount %d, refcount %d,",
- typename[vp->v_type], vp->v_usecount, vp->v_writecount,
- vp->v_holdcnt);
- buf[0] = '\0';
- if (vp->v_flag & VROOT)
- strcat(buf, "|VROOT");
- if (vp->v_flag & VTEXT)
- strcat(buf, "|VTEXT");
- if (vp->v_flag & VSYSTEM)
- strcat(buf, "|VSYSTEM");
- if (vp->v_flag & VNOFLUSH)
- strcat(buf, "|VNOFLUSH");
- if (vp->v_flag & VXLOCK)
- strcat(buf, "|VXLOCK");
- if (vp->v_flag & VXWANT)
- strcat(buf, "|VXWANT");
- if (vp->v_flag & VBWAIT)
- strcat(buf, "|VBWAIT");
- if (vp->v_flag & VALIASED)
- strcat(buf, "|VALIASED");
- if (buf[0] != '\0')
- printf(" flags (%s)", &buf[1]);
- if (vp->v_data == NULL) {
- printf("\n");
- } else {
- printf("\n\t");
- VOP_PRINT(vp);
- }
+
+void
+vnode_rele_ext(vnode_t vp, int fmode, int dont_reenter)
+{
+ vnode_rele_internal(vp, fmode, dont_reenter, 0);
}
-#ifdef DEBUG
-/*
- * List all of the locked vnodes in the system.
- * Called when debugging the kernel.
- */
+
void
-printlockedvnodes()
+vnode_rele_internal(vnode_t vp, int fmode, int dont_reenter, int locked)
{
- struct proc *p = current_proc();
- struct mount *mp, *nmp;
- struct vnode *vp;
- printf("Locked vnodes\n");
- simple_lock(&mountlist_slock);
- for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
- if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) {
- nmp = mp->mnt_list.cqe_next;
- continue;
+ if ( !locked)
+ vnode_lock_spin(vp);
+#if DIAGNOSTIC
+ else
+ lck_mtx_assert(&vp->v_lock, LCK_MTX_ASSERT_OWNED);
+#endif
+ if (--vp->v_usecount < 0)
+ panic("vnode_rele_ext: vp %p usecount -ve : %d. v_tag = %d, v_type = %d, v_flag = %x.", vp, vp->v_usecount, vp->v_tag, vp->v_type, vp->v_flag);
+
+ if (fmode & FWRITE) {
+ if (--vp->v_writecount < 0)
+ panic("vnode_rele_ext: vp %p writecount -ve : %d. v_tag = %d, v_type = %d, v_flag = %x.", vp, vp->v_writecount, vp->v_tag, vp->v_type, vp->v_flag);
+ }
+ if (fmode & O_EVTONLY) {
+ if (--vp->v_kusecount < 0)
+ panic("vnode_rele_ext: vp %p kusecount -ve : %d. v_tag = %d, v_type = %d, v_flag = %x.", vp, vp->v_kusecount, vp->v_tag, vp->v_type, vp->v_flag);
+ }
+ if (vp->v_kusecount > vp->v_usecount)
+ panic("vnode_rele_ext: vp %p kusecount(%d) out of balance with usecount(%d). v_tag = %d, v_type = %d, v_flag = %x.",vp, vp->v_kusecount, vp->v_usecount, vp->v_tag, vp->v_type, vp->v_flag);
+
+ if ((vp->v_iocount > 0) || (vp->v_usecount > 0)) {
+ /*
+ * vnode is still busy... if we're the last
+ * usecount, mark for a future call to VNOP_INACTIVE
+ * when the iocount finally drops to 0
+ */
+ if (vp->v_usecount == 0) {
+ vp->v_lflag |= VL_NEEDINACTIVE;
+ vp->v_flag &= ~(VNOCACHE_DATA | VRAOFF | VOPENEVT);
}
- for (vp = mp->mnt_vnodelist.lh_first;
- vp != NULL;
- vp = vp->v_mntvnodes.le_next) {
- if (VOP_ISLOCKED(vp))
- vprint((char *)0, vp);
+ goto done;
+ }
+ vp->v_flag &= ~(VNOCACHE_DATA | VRAOFF | VOPENEVT);
+
+ if ( (vp->v_lflag & (VL_TERMINATE | VL_DEAD)) || dont_reenter) {
+ /*
+ * vnode is being cleaned, or
+ * we've requested that we don't reenter
+ * the filesystem on this release... in
+ * this case, we'll mark the vnode aged
+ * if it's been marked for termination
+ */
+ if (dont_reenter) {
+ if ( !(vp->v_lflag & (VL_TERMINATE | VL_DEAD | VL_MARKTERM)) )
+ vp->v_lflag |= VL_NEEDINACTIVE;
+ vp->v_flag |= VAGE;
}
- simple_lock(&mountlist_slock);
- nmp = mp->mnt_list.cqe_next;
- vfs_unbusy(mp, p);
+ vnode_list_add(vp);
+
+ goto done;
}
- simple_unlock(&mountlist_slock);
-}
+ /*
+ * at this point both the iocount and usecount
+ * are zero
+ * pick up an iocount so that we can call
+ * VNOP_INACTIVE with the vnode lock unheld
+ */
+ vp->v_iocount++;
+#ifdef JOE_DEBUG
+ record_vp(vp, 1);
#endif
+ vp->v_lflag &= ~VL_NEEDINACTIVE;
+ vnode_unlock(vp);
-/*
- * Top level filesystem related information gathering.
- */
-int
-vfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
- int *name;
- u_int namelen;
- void *oldp;
- size_t *oldlenp;
- void *newp;
- size_t newlen;
- struct proc *p;
-{
- struct vfsconf *vfsp;
+ VNOP_INACTIVE(vp, vfs_context_current());
+ vnode_lock_spin(vp);
/*
- * The VFS_NUMMNTOPS shouldn't be at name[0] since
- * is a VFS generic variable. So now we must check
- * namelen so we don't end up covering any UFS
- * variables (sinc UFS vfc_typenum is 1).
- *
- * It should have been:
- * name[0]: VFS_GENERIC
- * name[1]: VFS_NUMMNTOPS
+ * because we dropped the vnode lock to call VNOP_INACTIVE
+ * the state of the vnode may have changed... we may have
+ * picked up an iocount, usecount or the MARKTERM may have
+ * been set... we need to reevaluate the reference counts
+ * to determine if we can call vnode_reclaim_internal at
+ * this point... if the reference counts are up, we'll pick
+ * up the MARKTERM state when they get subsequently dropped
*/
- if (namelen == 1 && name[0] == VFS_NUMMNTOPS) {
- extern unsigned int vfs_nummntops;
- return (sysctl_rdint(oldp, oldlenp, newp, vfs_nummntops));
- }
+ if ( (vp->v_iocount == 1) && (vp->v_usecount == 0) &&
+ ((vp->v_lflag & (VL_MARKTERM | VL_TERMINATE | VL_DEAD)) == VL_MARKTERM)) {
+ struct uthread *ut;
- /* all sysctl names at this level are at least name and field */
- if (namelen < 2)
- return (ENOTDIR); /* overloaded */
- if (name[0] != VFS_GENERIC) {
- for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
- if (vfsp->vfc_typenum == name[0])
- break;
- if (vfsp == NULL)
- return (EOPNOTSUPP);
- return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1,
- oldp, oldlenp, newp, newlen, p));
+ ut = get_bsdthread_info(current_thread());
+
+ if (ut->uu_defer_reclaims) {
+ vp->v_defer_reclaimlist = ut->uu_vreclaims;
+ ut->uu_vreclaims = vp;
+ goto done;
+ }
+ vnode_lock_convert(vp);
+ vnode_reclaim_internal(vp, 1, 1, 0);
}
- switch (name[1]) {
- case VFS_MAXTYPENUM:
- return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf));
- case VFS_CONF:
- if (namelen < 3)
- return (ENOTDIR); /* overloaded */
- for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
- if (vfsp->vfc_typenum == name[2])
- break;
- if (vfsp == NULL)
- return (EOPNOTSUPP);
- return (sysctl_rdstruct(oldp, oldlenp, newp, vfsp,
- sizeof(struct vfsconf)));
+ vnode_dropiocount(vp);
+ vnode_list_add(vp);
+done:
+ if (vp->v_usecount == 0 && vp->v_type == VREG && !(vp->v_flag & VSYSTEM)) {
+
+ if (vp->v_ubcinfo) {
+ vnode_lock_convert(vp);
+ memory_object_mark_unused(vp->v_ubcinfo->ui_control, (vp->v_flag & VRAGE) == VRAGE);
+ }
}
- return (EOPNOTSUPP);
+ if ( !locked)
+ vnode_unlock(vp);
+ return;
}
-int kinfo_vdebug = 1;
-#define KINFO_VNODESLOP 10
/*
- * Dump vnode list (via sysctl).
- * Copyout address of vnode followed by vnode.
+ * Remove any vnodes in the vnode table belonging to mount point mp.
+ *
+ * If MNT_NOFORCE is specified, there should not be any active ones,
+ * return error if any are found (nb: this is a user error, not a
+ * system error). If MNT_FORCE is specified, detach any active vnodes
+ * that are found.
*/
-/* ARGSUSED */
+#if DIAGNOSTIC
+int busyprt = 0; /* print out busy vnodes */
+#if 0
+struct ctldebug debug1 = { "busyprt", &busyprt };
+#endif /* 0 */
+#endif
+
int
-sysctl_vnode(where, sizep, p)
- char *where;
- size_t *sizep;
- struct proc *p;
-{
- struct mount *mp, *nmp;
- struct vnode *nvp, *vp;
- char *bp = where, *savebp;
- char *ewhere;
- int error;
+vflush(struct mount *mp, struct vnode *skipvp, int flags)
+{
+ struct vnode *vp;
+ int busy = 0;
+ int reclaimed = 0;
+ int retval;
+ unsigned int vid;
-#define VPTRSZ sizeof (struct vnode *)
-#define VNODESZ sizeof (struct vnode)
- if (where == NULL) {
- *sizep = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ);
- return (0);
+ mount_lock(mp);
+ vnode_iterate_setup(mp);
+ /*
+ * On regular unmounts(not forced) do a
+ * quick check for vnodes to be in use. This
+ * preserves the caching of vnodes. automounter
+ * tries unmounting every so often to see whether
+ * it is still busy or not.
+ */
+ if (((flags & FORCECLOSE)==0) && ((mp->mnt_kern_flag & MNTK_UNMOUNT_PREFLIGHT) != 0)) {
+ if (vnode_umount_preflight(mp, skipvp, flags)) {
+ vnode_iterate_clear(mp);
+ mount_unlock(mp);
+ return(EBUSY);
+ }
}
- ewhere = where + *sizep;
-
- simple_lock(&mountlist_slock);
- for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
- if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) {
- nmp = mp->mnt_list.cqe_next;
+loop:
+ /* it is returns 0 then there is nothing to do */
+ retval = vnode_iterate_prepare(mp);
+
+ if (retval == 0) {
+ vnode_iterate_clear(mp);
+ mount_unlock(mp);
+ return(retval);
+ }
+
+ /* iterate over all the vnodes */
+ while (!TAILQ_EMPTY(&mp->mnt_workerqueue)) {
+
+ vp = TAILQ_FIRST(&mp->mnt_workerqueue);
+ TAILQ_REMOVE(&mp->mnt_workerqueue, vp, v_mntvnodes);
+ TAILQ_INSERT_TAIL(&mp->mnt_vnodelist, vp, v_mntvnodes);
+
+ if ( (vp->v_mount != mp) || (vp == skipvp)) {
continue;
}
- savebp = bp;
-again:
- simple_lock(&mntvnode_slock);
- for (vp = mp->mnt_vnodelist.lh_first;
- vp != NULL;
- vp = nvp) {
- /*
- * Check that the vp is still associated with
- * this filesystem. RACE: could have been
- * recycled onto the same filesystem.
- */
- if (vp->v_mount != mp) {
- simple_unlock(&mntvnode_slock);
- if (kinfo_vdebug)
- printf("kinfo: vp changed\n");
- bp = savebp;
- goto again;
- }
- nvp = vp->v_mntvnodes.le_next;
- if (bp + VPTRSZ + VNODESZ > ewhere) {
- simple_unlock(&mntvnode_slock);
- *sizep = bp - where;
- return (ENOMEM);
- }
- simple_unlock(&mntvnode_slock);
- if ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) ||
- (error = copyout((caddr_t)vp, bp + VPTRSZ, VNODESZ)))
- return (error);
- bp += VPTRSZ + VNODESZ;
- simple_lock(&mntvnode_slock);
- }
- simple_unlock(&mntvnode_slock);
- simple_lock(&mountlist_slock);
- nmp = mp->mnt_list.cqe_next;
- vfs_unbusy(mp, p);
- }
- simple_unlock(&mountlist_slock);
-
- *sizep = bp - where;
+ vid = vp->v_id;
+ mount_unlock(mp);
+
+ vnode_lock_spin(vp);
+
+ if ((vp->v_id != vid) || ((vp->v_lflag & (VL_DEAD | VL_TERMINATE)))) {
+ vnode_unlock(vp);
+ mount_lock(mp);
+ continue;
+ }
+
+ /*
+ * If requested, skip over vnodes marked VSYSTEM.
+ * Skip over all vnodes marked VNOFLUSH.
+ */
+ if ((flags & SKIPSYSTEM) && ((vp->v_flag & VSYSTEM) ||
+ (vp->v_flag & VNOFLUSH))) {
+ vnode_unlock(vp);
+ mount_lock(mp);
+ continue;
+ }
+ /*
+ * If requested, skip over vnodes marked VSWAP.
+ */
+ if ((flags & SKIPSWAP) && (vp->v_flag & VSWAP)) {
+ vnode_unlock(vp);
+ mount_lock(mp);
+ continue;
+ }
+ /*
+ * If requested, skip over vnodes marked VROOT.
+ */
+ if ((flags & SKIPROOT) && (vp->v_flag & VROOT)) {
+ vnode_unlock(vp);
+ mount_lock(mp);
+ continue;
+ }
+ /*
+ * If WRITECLOSE is set, only flush out regular file
+ * vnodes open for writing.
+ */
+ if ((flags & WRITECLOSE) &&
+ (vp->v_writecount == 0 || vp->v_type != VREG)) {
+ vnode_unlock(vp);
+ mount_lock(mp);
+ continue;
+ }
+ /*
+ * If the real usecount is 0, all we need to do is clear
+ * out the vnode data structures and we are done.
+ */
+ if (((vp->v_usecount == 0) ||
+ ((vp->v_usecount - vp->v_kusecount) == 0))) {
+
+ vnode_lock_convert(vp);
+ vp->v_iocount++; /* so that drain waits for * other iocounts */
+#ifdef JOE_DEBUG
+ record_vp(vp, 1);
+#endif
+ vnode_reclaim_internal(vp, 1, 1, 0);
+ vnode_dropiocount(vp);
+ vnode_list_add(vp);
+ vnode_unlock(vp);
+
+ reclaimed++;
+ mount_lock(mp);
+ continue;
+ }
+ /*
+ * If FORCECLOSE is set, forcibly close the vnode.
+ * For block or character devices, revert to an
+ * anonymous device. For all other files, just kill them.
+ */
+ if (flags & FORCECLOSE) {
+ vnode_lock_convert(vp);
+
+ if (vp->v_type != VBLK && vp->v_type != VCHR) {
+ vp->v_iocount++; /* so that drain waits * for other iocounts */
+#ifdef JOE_DEBUG
+ record_vp(vp, 1);
+#endif
+ vnode_reclaim_internal(vp, 1, 1, 0);
+ vnode_dropiocount(vp);
+ vnode_list_add(vp);
+ vnode_unlock(vp);
+ } else {
+ vclean(vp, 0);
+ vp->v_lflag &= ~VL_DEAD;
+ vp->v_op = spec_vnodeop_p;
+ vp->v_flag |= VDEVFLUSH;
+ vnode_unlock(vp);
+ }
+ mount_lock(mp);
+ continue;
+ }
+#if DIAGNOSTIC
+ if (busyprt)
+ vprint("vflush: busy vnode", vp);
+#endif
+ vnode_unlock(vp);
+ mount_lock(mp);
+ busy++;
+ }
+
+ /* At this point the worker queue is completed */
+ if (busy && ((flags & FORCECLOSE)==0) && reclaimed) {
+ busy = 0;
+ reclaimed = 0;
+ (void)vnode_iterate_reloadq(mp);
+ /* returned with mount lock held */
+ goto loop;
+ }
+
+ /* if new vnodes were created in between retry the reclaim */
+ if ( vnode_iterate_reloadq(mp) != 0) {
+ if (!(busy && ((flags & FORCECLOSE)==0)))
+ goto loop;
+ }
+ vnode_iterate_clear(mp);
+ mount_unlock(mp);
+
+ if (busy && ((flags & FORCECLOSE)==0))
+ return (EBUSY);
return (0);
}
+long num_recycledvnodes = 0;
/*
- * Check to see if a filesystem is mounted on a block device.
+ * Disassociate the underlying file system from a vnode.
+ * The vnode lock is held on entry.
+ */
+static void
+vclean(vnode_t vp, int flags)
+{
+ vfs_context_t ctx = vfs_context_current();
+ int active;
+ int need_inactive;
+ int already_terminating;
+ int clflags = 0;
+#if NAMEDSTREAMS
+ int is_namedstream;
+#endif
+
+ /*
+ * Check to see if the vnode is in use.
+ * If so we have to reference it before we clean it out
+ * so that its count cannot fall to zero and generate a
+ * race against ourselves to recycle it.
+ */
+ active = vp->v_usecount;
+
+ /*
+ * just in case we missed sending a needed
+ * VNOP_INACTIVE, we'll do it now
+ */
+ need_inactive = (vp->v_lflag & VL_NEEDINACTIVE);
+
+ vp->v_lflag &= ~VL_NEEDINACTIVE;
+
+ /*
+ * Prevent the vnode from being recycled or
+ * brought into use while we clean it out.
+ */
+ already_terminating = (vp->v_lflag & VL_TERMINATE);
+
+ vp->v_lflag |= VL_TERMINATE;
+
+ /*
+ * remove the vnode from any mount list
+ * it might be on...
+ */
+ insmntque(vp, (struct mount *)0);
+
+#if NAMEDSTREAMS
+ is_namedstream = vnode_isnamedstream(vp);
+#endif
+
+ vnode_unlock(vp);
+
+ OSAddAtomicLong(1, &num_recycledvnodes);
+
+ if (flags & DOCLOSE)
+ clflags |= IO_NDELAY;
+ if (flags & REVOKEALL)
+ clflags |= IO_REVOKE;
+
+ if (active && (flags & DOCLOSE))
+ VNOP_CLOSE(vp, clflags, ctx);
+
+ /*
+ * Clean out any buffers associated with the vnode.
+ */
+ if (flags & DOCLOSE) {
+#if NFSCLIENT
+ if (vp->v_tag == VT_NFS)
+ nfs_vinvalbuf(vp, V_SAVE, ctx, 0);
+ else
+#endif
+ {
+ VNOP_FSYNC(vp, MNT_WAIT, ctx);
+ buf_invalidateblks(vp, BUF_WRITE_DATA | BUF_INVALIDATE_LOCKED, 0, 0);
+ }
+ if (UBCINFOEXISTS(vp))
+ /*
+ * Clean the pages in VM.
+ */
+ (void)ubc_msync(vp, (off_t)0, ubc_getsize(vp), NULL, UBC_PUSHALL | UBC_INVALIDATE | UBC_SYNC);
+ }
+ if (active || need_inactive)
+ VNOP_INACTIVE(vp, ctx);
+
+#if NAMEDSTREAMS
+ if ((is_namedstream != 0) && (vp->v_parent != NULLVP)) {
+ vnode_t pvp = vp->v_parent;
+
+ /* Delete the shadow stream file before we reclaim its vnode */
+ if (vnode_isshadow(vp)) {
+ vnode_relenamedstream(pvp, vp, ctx);
+ }
+
+ /*
+ * No more streams associated with the parent. We
+ * have a ref on it, so its identity is stable.
+ * If the parent is on an opaque volume, then we need to know
+ * whether it has associated named streams.
+ */
+ if (vfs_authopaque(pvp->v_mount)) {
+ vnode_lock_spin(pvp);
+ pvp->v_lflag &= ~VL_HASSTREAMS;
+ vnode_unlock(pvp);
+ }
+ }
+#endif
+
+ /*
+ * Destroy ubc named reference
+ * cluster_release is done on this path
+ * along with dropping the reference on the ucred
+ */
+ ubc_destroy_named(vp);
+
+#if CONFIG_TRIGGERS
+ /*
+ * cleanup trigger info from vnode (if any)
+ */
+ if (vp->v_resolve)
+ vnode_resolver_detach(vp);
+#endif
+
+ /*
+ * Reclaim the vnode.
+ */
+ if (VNOP_RECLAIM(vp, ctx))
+ panic("vclean: cannot reclaim");
+
+ // make sure the name & parent ptrs get cleaned out!
+ vnode_update_identity(vp, NULLVP, NULL, 0, 0, VNODE_UPDATE_PARENT | VNODE_UPDATE_NAME | VNODE_UPDATE_PURGE);
+
+ vnode_lock(vp);
+
+ vp->v_mount = dead_mountp;
+ vp->v_op = dead_vnodeop_p;
+ vp->v_tag = VT_NON;
+ vp->v_data = NULL;
+
+ vp->v_lflag |= VL_DEAD;
+
+ if (already_terminating == 0) {
+ vp->v_lflag &= ~VL_TERMINATE;
+ /*
+ * Done with purge, notify sleepers of the grim news.
+ */
+ if (vp->v_lflag & VL_TERMWANT) {
+ vp->v_lflag &= ~VL_TERMWANT;
+ wakeup(&vp->v_lflag);
+ }
+ }
+}
+
+/*
+ * Eliminate all activity associated with the requested vnode
+ * and with all vnodes aliased to the requested vnode.
*/
int
-vfs_mountedon(vp)
- struct vnode *vp;
+#if DIAGNOSTIC
+vn_revoke(vnode_t vp, int flags, __unused vfs_context_t a_context)
+#else
+vn_revoke(vnode_t vp, __unused int flags, __unused vfs_context_t a_context)
+#endif
{
struct vnode *vq;
- int error = 0;
+ int vid;
- if (vp->v_specflags & SI_MOUNTEDON)
- return (EBUSY);
- if (vp->v_flag & VALIASED) {
- simple_lock(&spechash_slock);
- for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
- if (vq->v_rdev != vp->v_rdev ||
- vq->v_type != vp->v_type)
- continue;
- if (vq->v_specflags & SI_MOUNTEDON) {
- error = EBUSY;
+#if DIAGNOSTIC
+ if ((flags & REVOKEALL) == 0)
+ panic("vnop_revoke");
+#endif
+
+ if (vnode_isaliased(vp)) {
+ /*
+ * If a vgone (or vclean) is already in progress,
+ * return an immediate error
+ */
+ if (vp->v_lflag & VL_TERMINATE)
+ return(ENOENT);
+
+ /*
+ * Ensure that vp will not be vgone'd while we
+ * are eliminating its aliases.
+ */
+ SPECHASH_LOCK();
+ while ((vp->v_specflags & SI_ALIASED)) {
+ for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
+ if (vq->v_rdev != vp->v_rdev ||
+ vq->v_type != vp->v_type || vp == vq)
+ continue;
+ vid = vq->v_id;
+ SPECHASH_UNLOCK();
+ if (vnode_getwithvid(vq,vid)){
+ SPECHASH_LOCK();
+ break;
+ }
+ vnode_reclaim_internal(vq, 0, 1, 0);
+ vnode_put(vq);
+ SPECHASH_LOCK();
break;
}
}
- simple_unlock(&spechash_slock);
+ SPECHASH_UNLOCK();
}
- return (error);
+ vnode_reclaim_internal(vp, 0, 0, REVOKEALL);
+
+ return (0);
}
/*
- * Unmount all filesystems. The list is traversed in reverse order
- * of mounting to avoid dependencies.
+ * Recycle an unused vnode to the front of the free list.
+ * Release the passed interlock if the vnode will be recycled.
*/
-__private_extern__ void
-vfs_unmountall()
+int
+vnode_recycle(struct vnode *vp)
+{
+ vnode_lock_spin(vp);
+
+ if (vp->v_iocount || vp->v_usecount) {
+ vp->v_lflag |= VL_MARKTERM;
+ vnode_unlock(vp);
+ return(0);
+ }
+ vnode_lock_convert(vp);
+ vnode_reclaim_internal(vp, 1, 0, 0);
+
+ vnode_unlock(vp);
+
+ return (1);
+}
+
+static int
+vnode_reload(vnode_t vp)
+{
+ vnode_lock_spin(vp);
+
+ if ((vp->v_iocount > 1) || vp->v_usecount) {
+ vnode_unlock(vp);
+ return(0);
+ }
+ if (vp->v_iocount <= 0)
+ panic("vnode_reload with no iocount %d", vp->v_iocount);
+
+ /* mark for release when iocount is dopped */
+ vp->v_lflag |= VL_MARKTERM;
+ vnode_unlock(vp);
+
+ return (1);
+}
+
+
+static void
+vgone(vnode_t vp, int flags)
{
- struct mount *mp, *nmp;
- struct proc *p = current_proc();
+ struct vnode *vq;
+ struct vnode *vx;
/*
- * Since this only runs when rebooting, it is not interlocked.
+ * Clean out the filesystem specific data.
+ * vclean also takes care of removing the
+ * vnode from any mount list it might be on
+ */
+ vclean(vp, flags | DOCLOSE);
+
+ /*
+ * If special device, remove it from special device alias list
+ * if it is on one.
*/
- for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) {
- nmp = mp->mnt_list.cqe_prev;
- (void) dounmount(mp, MNT_FORCE, p);
+ if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_specinfo != 0) {
+ SPECHASH_LOCK();
+ if (*vp->v_hashchain == vp) {
+ *vp->v_hashchain = vp->v_specnext;
+ } else {
+ for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
+ if (vq->v_specnext != vp)
+ continue;
+ vq->v_specnext = vp->v_specnext;
+ break;
+ }
+ if (vq == NULL)
+ panic("missing bdev");
+ }
+ if (vp->v_specflags & SI_ALIASED) {
+ vx = NULL;
+ for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
+ if (vq->v_rdev != vp->v_rdev ||
+ vq->v_type != vp->v_type)
+ continue;
+ if (vx)
+ break;
+ vx = vq;
+ }
+ if (vx == NULL)
+ panic("missing alias");
+ if (vq == NULL)
+ vx->v_specflags &= ~SI_ALIASED;
+ vp->v_specflags &= ~SI_ALIASED;
+ }
+ SPECHASH_UNLOCK();
+ {
+ struct specinfo *tmp = vp->v_specinfo;
+ vp->v_specinfo = NULL;
+ FREE_ZONE((void *)tmp, sizeof(struct specinfo), M_SPECINFO);
+ }
}
}
/*
- * Build hash lists of net addresses and hang them off the mount point.
- * Called by vfs_export() to set up the lists of export addresses.
+ * Lookup a vnode by device number.
*/
-static int
-vfs_hang_addrlist(mp, nep, argp)
- struct mount *mp;
- struct netexport *nep;
- struct export_args *argp;
-{
- register struct netcred *np;
- register struct radix_node_head *rnh;
- register int i;
- struct radix_node *rn;
- struct sockaddr *saddr, *smask = 0;
- struct domain *dom;
- int error;
+int
+check_mountedon(dev_t dev, enum vtype type, int *errorp)
+{
+ vnode_t vp;
+ int rc = 0;
+ int vid;
- if (argp->ex_addrlen == 0) {
- if (mp->mnt_flag & MNT_DEFEXPORTED)
- return (EPERM);
- np = &nep->ne_defexported;
- np->netc_exflags = argp->ex_flags;
- np->netc_anon = argp->ex_anon;
- np->netc_anon.cr_ref = 1;
- mp->mnt_flag |= MNT_DEFEXPORTED;
- return (0);
- }
- i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
- MALLOC(np, struct netcred *, i, M_NETADDR, M_WAITOK);
- bzero((caddr_t)np, i);
- saddr = (struct sockaddr *)(np + 1);
- if (error = copyin(argp->ex_addr, (caddr_t)saddr, argp->ex_addrlen))
- goto out;
- if (saddr->sa_len > argp->ex_addrlen)
- saddr->sa_len = argp->ex_addrlen;
- if (argp->ex_masklen) {
- smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
- error = copyin(argp->ex_addr, (caddr_t)smask, argp->ex_masklen);
- if (error)
- goto out;
- if (smask->sa_len > argp->ex_masklen)
- smask->sa_len = argp->ex_masklen;
+loop:
+ SPECHASH_LOCK();
+ for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) {
+ if (dev != vp->v_rdev || type != vp->v_type)
+ continue;
+ vid = vp->v_id;
+ SPECHASH_UNLOCK();
+ if (vnode_getwithvid(vp,vid))
+ goto loop;
+ vnode_lock_spin(vp);
+ if ((vp->v_usecount > 0) || (vp->v_iocount > 1)) {
+ vnode_unlock(vp);
+ if ((*errorp = vfs_mountedon(vp)) != 0)
+ rc = 1;
+ } else
+ vnode_unlock(vp);
+ vnode_put(vp);
+ return(rc);
}
- i = saddr->sa_family;
- if ((rnh = nep->ne_rtable[i]) == 0) {
+ SPECHASH_UNLOCK();
+ return (0);
+}
+
+/*
+ * Calculate the total number of references to a special device.
+ */
+int
+vcount(vnode_t vp)
+{
+ vnode_t vq, vnext;
+ int count;
+ int vid;
+
+loop:
+ if (!vnode_isaliased(vp))
+ return (vp->v_specinfo->si_opencount);
+ count = 0;
+
+ SPECHASH_LOCK();
+ /*
+ * Grab first vnode and its vid.
+ */
+ vq = *vp->v_hashchain;
+ vid = vq ? vq->v_id : 0;
+
+ SPECHASH_UNLOCK();
+
+ while (vq) {
/*
- * Seems silly to initialize every AF when most are not
- * used, do so on demand here
+ * Attempt to get the vnode outside the SPECHASH lock.
*/
- for (dom = domains; dom; dom = dom->dom_next)
- if (dom->dom_family == i && dom->dom_rtattach) {
- dom->dom_rtattach((void **)&nep->ne_rtable[i],
- dom->dom_rtoffset);
- break;
+ if (vnode_getwithvid(vq, vid)) {
+ goto loop;
+ }
+ vnode_lock(vq);
+
+ if (vq->v_rdev == vp->v_rdev && vq->v_type == vp->v_type) {
+ if ((vq->v_usecount == 0) && (vq->v_iocount == 1) && vq != vp) {
+ /*
+ * Alias, but not in use, so flush it out.
+ */
+ vnode_reclaim_internal(vq, 1, 1, 0);
+ vnode_put_locked(vq);
+ vnode_unlock(vq);
+ goto loop;
}
- if ((rnh = nep->ne_rtable[i]) == 0) {
- error = ENOBUFS;
- goto out;
+ count += vq->v_specinfo->si_opencount;
+ }
+ vnode_unlock(vq);
+
+ SPECHASH_LOCK();
+ /*
+ * must do this with the reference still held on 'vq'
+ * so that it can't be destroyed while we're poking
+ * through v_specnext
+ */
+ vnext = vq->v_specnext;
+ vid = vnext ? vnext->v_id : 0;
+
+ SPECHASH_UNLOCK();
+
+ vnode_put(vq);
+
+ vq = vnext;
+ }
+
+ return (count);
+}
+
+int prtactive = 0; /* 1 => print out reclaim of active vnodes */
+
+/*
+ * Print out a description of a vnode.
+ */
+static const char *typename[] =
+ { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" };
+
+void
+vprint(const char *label, struct vnode *vp)
+{
+ char sbuf[64];
+
+ if (label != NULL)
+ printf("%s: ", label);
+ printf("type %s, usecount %d, writecount %d",
+ typename[vp->v_type], vp->v_usecount, vp->v_writecount);
+ sbuf[0] = '\0';
+ if (vp->v_flag & VROOT)
+ strlcat(sbuf, "|VROOT", sizeof(sbuf));
+ if (vp->v_flag & VTEXT)
+ strlcat(sbuf, "|VTEXT", sizeof(sbuf));
+ if (vp->v_flag & VSYSTEM)
+ strlcat(sbuf, "|VSYSTEM", sizeof(sbuf));
+ if (vp->v_flag & VNOFLUSH)
+ strlcat(sbuf, "|VNOFLUSH", sizeof(sbuf));
+ if (vp->v_flag & VBWAIT)
+ strlcat(sbuf, "|VBWAIT", sizeof(sbuf));
+ if (vnode_isaliased(vp))
+ strlcat(sbuf, "|VALIASED", sizeof(sbuf));
+ if (sbuf[0] != '\0')
+ printf(" flags (%s)", &sbuf[1]);
+}
+
+
+int
+vn_getpath(struct vnode *vp, char *pathbuf, int *len)
+{
+ return build_path(vp, pathbuf, *len, len, BUILDPATH_NO_FS_ENTER, vfs_context_current());
+}
+
+int
+vn_getpath_fsenter(struct vnode *vp, char *pathbuf, int *len)
+{
+ return build_path(vp, pathbuf, *len, len, 0, vfs_context_current());
+}
+
+int
+vn_getcdhash(struct vnode *vp, off_t offset, unsigned char *cdhash)
+{
+ return ubc_cs_getcdhash(vp, offset, cdhash);
+}
+
+
+static char *extension_table=NULL;
+static int nexts;
+static int max_ext_width;
+
+static int
+extension_cmp(const void *a, const void *b)
+{
+ return (strlen((const char *)a) - strlen((const char *)b));
+}
+
+
+//
+// This is the api LaunchServices uses to inform the kernel
+// the list of package extensions to ignore.
+//
+// Internally we keep the list sorted by the length of the
+// the extension (from longest to shortest). We sort the
+// list of extensions so that we can speed up our searches
+// when comparing file names -- we only compare extensions
+// that could possibly fit into the file name, not all of
+// them (i.e. a short 8 character name can't have an 8
+// character extension).
+//
+extern lck_mtx_t *pkg_extensions_lck;
+
+__private_extern__ int
+set_package_extensions_table(user_addr_t data, int nentries, int maxwidth)
+{
+ char *new_exts, *old_exts;
+ int error;
+
+ if (nentries <= 0 || nentries > 1024 || maxwidth <= 0 || maxwidth > 255) {
+ return EINVAL;
+ }
+
+
+ // allocate one byte extra so we can guarantee null termination
+ MALLOC(new_exts, char *, (nentries * maxwidth) + 1, M_TEMP, M_WAITOK);
+ if (new_exts == NULL) {
+ return ENOMEM;
+ }
+
+ error = copyin(data, new_exts, nentries * maxwidth);
+ if (error) {
+ FREE(new_exts, M_TEMP);
+ return error;
+ }
+
+ new_exts[(nentries * maxwidth)] = '\0'; // guarantee null termination of the block
+
+ qsort(new_exts, nentries, maxwidth, extension_cmp);
+
+ lck_mtx_lock(pkg_extensions_lck);
+
+ old_exts = extension_table;
+ extension_table = new_exts;
+ nexts = nentries;
+ max_ext_width = maxwidth;
+
+ lck_mtx_unlock(pkg_extensions_lck);
+
+ if (old_exts) {
+ FREE(old_exts, M_TEMP);
+ }
+
+ return 0;
+}
+
+
+__private_extern__ int
+is_package_name(const char *name, int len)
+{
+ int i, extlen;
+ const char *ptr, *name_ext;
+
+ if (len <= 3) {
+ return 0;
+ }
+
+ name_ext = NULL;
+ for(ptr=name; *ptr != '\0'; ptr++) {
+ if (*ptr == '.') {
+ name_ext = ptr;
+ }
+ }
+
+ // if there is no "." extension, it can't match
+ if (name_ext == NULL) {
+ return 0;
+ }
+
+ // advance over the "."
+ name_ext++;
+
+ lck_mtx_lock(pkg_extensions_lck);
+
+ // now iterate over all the extensions to see if any match
+ ptr = &extension_table[0];
+ for(i=0; i < nexts; i++, ptr+=max_ext_width) {
+ extlen = strlen(ptr);
+ if (strncasecmp(name_ext, ptr, extlen) == 0 && name_ext[extlen] == '\0') {
+ // aha, a match!
+ lck_mtx_unlock(pkg_extensions_lck);
+ return 1;
+ }
+ }
+
+ lck_mtx_unlock(pkg_extensions_lck);
+
+ // if we get here, no extension matched
+ return 0;
+}
+
+int
+vn_path_package_check(__unused vnode_t vp, char *path, int pathlen, int *component)
+{
+ char *ptr, *end;
+ int comp=0;
+
+ *component = -1;
+ if (*path != '/') {
+ return EINVAL;
+ }
+
+ end = path + 1;
+ while(end < path + pathlen && *end != '\0') {
+ while(end < path + pathlen && *end == '/' && *end != '\0') {
+ end++;
+ }
+
+ ptr = end;
+
+ while(end < path + pathlen && *end != '/' && *end != '\0') {
+ end++;
+ }
+
+ if (end > path + pathlen) {
+ // hmm, string wasn't null terminated
+ return EINVAL;
+ }
+
+ *end = '\0';
+ if (is_package_name(ptr, end - ptr)) {
+ *component = comp;
+ break;
+ }
+
+ end++;
+ comp++;
+ }
+
+ return 0;
+}
+
+/*
+ * Determine if a name is inappropriate for a searchfs query.
+ * This list consists of /System currently.
+ */
+
+int vn_searchfs_inappropriate_name(const char *name, int len) {
+ const char *bad_names[] = { "System" };
+ int bad_len[] = { 6 };
+ int i;
+
+ for(i=0; i < (int) (sizeof(bad_names) / sizeof(bad_names[0])); i++) {
+ if (len == bad_len[i] && strncmp(name, bad_names[i], strlen(bad_names[i]) + 1) == 0) {
+ return 1;
+ }
+ }
+
+ // if we get here, no name matched
+ return 0;
+}
+
+/*
+ * Top level filesystem related information gathering.
+ */
+extern unsigned int vfs_nummntops;
+
+int
+vfs_sysctl(int *name, u_int namelen, user_addr_t oldp, size_t *oldlenp,
+ user_addr_t newp, size_t newlen, proc_t p)
+{
+ struct vfstable *vfsp;
+ int *username;
+ u_int usernamelen;
+ int error;
+ struct vfsconf vfsc;
+
+ /* All non VFS_GENERIC and in VFS_GENERIC,
+ * VFS_MAXTYPENUM, VFS_CONF, VFS_SET_PACKAGE_EXTS
+ * needs to have root priv to have modifiers.
+ * For rest the userland_sysctl(CTLFLAG_ANYBODY) would cover.
+ */
+ if ((newp != USER_ADDR_NULL) && ((name[0] != VFS_GENERIC) ||
+ ((name[1] == VFS_MAXTYPENUM) ||
+ (name[1] == VFS_CONF) ||
+ (name[1] == VFS_SET_PACKAGE_EXTS)))
+ && (error = suser(kauth_cred_get(), &p->p_acflag))) {
+ return(error);
+ }
+ /*
+ * The VFS_NUMMNTOPS shouldn't be at name[0] since
+ * is a VFS generic variable. So now we must check
+ * namelen so we don't end up covering any UFS
+ * variables (sinc UFS vfc_typenum is 1).
+ *
+ * It should have been:
+ * name[0]: VFS_GENERIC
+ * name[1]: VFS_NUMMNTOPS
+ */
+ if (namelen == 1 && name[0] == VFS_NUMMNTOPS) {
+ return (sysctl_rdint(oldp, oldlenp, newp, vfs_nummntops));
+ }
+
+ /* all sysctl names at this level are at least name and field */
+ if (namelen < 2)
+ return (EISDIR); /* overloaded */
+ if (name[0] != VFS_GENERIC) {
+
+ mount_list_lock();
+ for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
+ if (vfsp->vfc_typenum == name[0]) {
+ vfsp->vfc_refcount++;
+ break;
+ }
+ mount_list_unlock();
+
+ if (vfsp == NULL)
+ return (ENOTSUP);
+
+ /* XXX current context proxy for proc p? */
+ error = ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1,
+ oldp, oldlenp, newp, newlen,
+ vfs_context_current()));
+
+ mount_list_lock();
+ vfsp->vfc_refcount--;
+ mount_list_unlock();
+ return error;
+ }
+ switch (name[1]) {
+ case VFS_MAXTYPENUM:
+ return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf));
+ case VFS_CONF:
+ if (namelen < 3)
+ return (ENOTDIR); /* overloaded */
+
+ mount_list_lock();
+ for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
+ if (vfsp->vfc_typenum == name[2])
+ break;
+
+ if (vfsp == NULL) {
+ mount_list_unlock();
+ return (ENOTSUP);
+ }
+
+ vfsc.vfc_reserved1 = 0;
+ bcopy(vfsp->vfc_name, vfsc.vfc_name, sizeof(vfsc.vfc_name));
+ vfsc.vfc_typenum = vfsp->vfc_typenum;
+ vfsc.vfc_refcount = vfsp->vfc_refcount;
+ vfsc.vfc_flags = vfsp->vfc_flags;
+ vfsc.vfc_reserved2 = 0;
+ vfsc.vfc_reserved3 = 0;
+
+ mount_list_unlock();
+ return (sysctl_rdstruct(oldp, oldlenp, newp, &vfsc,
+ sizeof(struct vfsconf)));
+
+ case VFS_SET_PACKAGE_EXTS:
+ return set_package_extensions_table((user_addr_t)((unsigned)name[1]), name[2], name[3]);
+ }
+ /*
+ * We need to get back into the general MIB, so we need to re-prepend
+ * CTL_VFS to our name and try userland_sysctl().
+ */
+ usernamelen = namelen + 1;
+ MALLOC(username, int *, usernamelen * sizeof(*username),
+ M_TEMP, M_WAITOK);
+ bcopy(name, username + 1, namelen * sizeof(*name));
+ username[0] = CTL_VFS;
+ error = userland_sysctl(p, username, usernamelen, oldp,
+ oldlenp, newp, newlen, oldlenp);
+ FREE(username, M_TEMP);
+ return (error);
+}
+
+/*
+ * Dump vnode list (via sysctl) - defunct
+ * use "pstat" instead
+ */
+/* ARGSUSED */
+int
+sysctl_vnode
+(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, __unused struct sysctl_req *req)
+{
+ return(EINVAL);
+}
+
+SYSCTL_PROC(_kern, KERN_VNODE, vnode,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_MASKED | CTLFLAG_LOCKED,
+ 0, 0, sysctl_vnode, "S,", "");
+
+
+/*
+ * Check to see if a filesystem is mounted on a block device.
+ */
+int
+vfs_mountedon(struct vnode *vp)
+{
+ struct vnode *vq;
+ int error = 0;
+
+ SPECHASH_LOCK();
+ if (vp->v_specflags & SI_MOUNTEDON) {
+ error = EBUSY;
+ goto out;
+ }
+ if (vp->v_specflags & SI_ALIASED) {
+ for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
+ if (vq->v_rdev != vp->v_rdev ||
+ vq->v_type != vp->v_type)
+ continue;
+ if (vq->v_specflags & SI_MOUNTEDON) {
+ error = EBUSY;
+ break;
+ }
+ }
+ }
+out:
+ SPECHASH_UNLOCK();
+ return (error);
+}
+
+/*
+ * Unmount all filesystems. The list is traversed in reverse order
+ * of mounting to avoid dependencies.
+ */
+__private_extern__ void
+vfs_unmountall(void)
+{
+ struct mount *mp;
+ int error;
+
+ /*
+ * Since this only runs when rebooting, it is not interlocked.
+ */
+ mount_list_lock();
+ while(!TAILQ_EMPTY(&mountlist)) {
+ mp = TAILQ_LAST(&mountlist, mntlist);
+ mount_list_unlock();
+ error = dounmount(mp, MNT_FORCE, 0, vfs_context_current());
+ if ((error != 0) && (error != EBUSY)) {
+ printf("unmount of %s failed (", mp->mnt_vfsstat.f_mntonname);
+ printf("%d)\n", error);
+ mount_list_lock();
+ TAILQ_REMOVE(&mountlist, mp, mnt_list);
+ continue;
+ } else if (error == EBUSY) {
+ /* If EBUSY is returned, the unmount was already in progress */
+ printf("unmount of %p failed (", mp);
+ printf("BUSY)\n");
+ }
+ mount_list_lock();
+ }
+ mount_list_unlock();
+}
+
+
+/*
+ * This routine is called from vnode_pager_deallocate out of the VM
+ * The path to vnode_pager_deallocate can only be initiated by ubc_destroy_named
+ * on a vnode that has a UBCINFO
+ */
+__private_extern__ void
+vnode_pager_vrele(vnode_t vp)
+{
+ struct ubc_info *uip;
+
+ vnode_lock_spin(vp);
+
+ vp->v_lflag &= ~VNAMED_UBC;
+
+ uip = vp->v_ubcinfo;
+ vp->v_ubcinfo = UBC_INFO_NULL;
+
+ vnode_unlock(vp);
+
+ ubc_info_deallocate(uip);
+}
+
+
+#include <sys/disk.h>
+
+u_int32_t rootunit = (u_int32_t)-1;
+
+errno_t
+vfs_init_io_attributes(vnode_t devvp, mount_t mp)
+{
+ int error;
+ off_t readblockcnt = 0;
+ off_t writeblockcnt = 0;
+ off_t readmaxcnt = 0;
+ off_t writemaxcnt = 0;
+ off_t readsegcnt = 0;
+ off_t writesegcnt = 0;
+ off_t readsegsize = 0;
+ off_t writesegsize = 0;
+ off_t alignment = 0;
+ off_t ioqueue_depth = 0;
+ u_int32_t blksize;
+ u_int64_t temp;
+ u_int32_t features;
+ vfs_context_t ctx = vfs_context_current();
+ int isssd = 0;
+ int isvirtual = 0;
+
+
+ VNOP_IOCTL(devvp, DKIOCGETTHROTTLEMASK, (caddr_t)&mp->mnt_throttle_mask, 0, NULL);
+ /*
+ * as a reasonable approximation, only use the lowest bit of the mask
+ * to generate a disk unit number
+ */
+ mp->mnt_devbsdunit = num_trailing_0(mp->mnt_throttle_mask);
+
+ if (devvp == rootvp)
+ rootunit = mp->mnt_devbsdunit;
+
+ if (mp->mnt_devbsdunit == rootunit) {
+ /*
+ * this mount point exists on the same device as the root
+ * partition, so it comes under the hard throttle control...
+ * this is true even for the root mount point itself
+ */
+ mp->mnt_kern_flag |= MNTK_ROOTDEV;
+ }
+ /*
+ * force the spec device to re-cache
+ * the underlying block size in case
+ * the filesystem overrode the initial value
+ */
+ set_fsblocksize(devvp);
+
+
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETBLOCKSIZE,
+ (caddr_t)&blksize, 0, ctx)))
+ return (error);
+
+ mp->mnt_devblocksize = blksize;
+
+ /*
+ * set the maximum possible I/O size
+ * this may get clipped to a smaller value
+ * based on which constraints are being advertised
+ * and if those advertised constraints result in a smaller
+ * limit for a given I/O
+ */
+ mp->mnt_maxreadcnt = MAX_UPL_SIZE * PAGE_SIZE;
+ mp->mnt_maxwritecnt = MAX_UPL_SIZE * PAGE_SIZE;
+
+ if (VNOP_IOCTL(devvp, DKIOCISVIRTUAL, (caddr_t)&isvirtual, 0, ctx) == 0) {
+ if (isvirtual)
+ mp->mnt_kern_flag |= MNTK_VIRTUALDEV;
+ }
+ if (VNOP_IOCTL(devvp, DKIOCISSOLIDSTATE, (caddr_t)&isssd, 0, ctx) == 0) {
+ if (isssd)
+ mp->mnt_kern_flag |= MNTK_SSD;
+ }
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETFEATURES,
+ (caddr_t)&features, 0, ctx)))
+ return (error);
+
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXBLOCKCOUNTREAD,
+ (caddr_t)&readblockcnt, 0, ctx)))
+ return (error);
+
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXBLOCKCOUNTWRITE,
+ (caddr_t)&writeblockcnt, 0, ctx)))
+ return (error);
+
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXBYTECOUNTREAD,
+ (caddr_t)&readmaxcnt, 0, ctx)))
+ return (error);
+
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXBYTECOUNTWRITE,
+ (caddr_t)&writemaxcnt, 0, ctx)))
+ return (error);
+
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXSEGMENTCOUNTREAD,
+ (caddr_t)&readsegcnt, 0, ctx)))
+ return (error);
+
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXSEGMENTCOUNTWRITE,
+ (caddr_t)&writesegcnt, 0, ctx)))
+ return (error);
+
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXSEGMENTBYTECOUNTREAD,
+ (caddr_t)&readsegsize, 0, ctx)))
+ return (error);
+
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETMAXSEGMENTBYTECOUNTWRITE,
+ (caddr_t)&writesegsize, 0, ctx)))
+ return (error);
+
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETMINSEGMENTALIGNMENTBYTECOUNT,
+ (caddr_t)&alignment, 0, ctx)))
+ return (error);
+
+ if ((error = VNOP_IOCTL(devvp, DKIOCGETCOMMANDPOOLSIZE,
+ (caddr_t)&ioqueue_depth, 0, ctx)))
+ return (error);
+
+ if (readmaxcnt)
+ mp->mnt_maxreadcnt = (readmaxcnt > UINT32_MAX) ? UINT32_MAX : readmaxcnt;
+
+ if (readblockcnt) {
+ temp = readblockcnt * blksize;
+ temp = (temp > UINT32_MAX) ? UINT32_MAX : temp;
+
+ if (temp < mp->mnt_maxreadcnt)
+ mp->mnt_maxreadcnt = (u_int32_t)temp;
+ }
+
+ if (writemaxcnt)
+ mp->mnt_maxwritecnt = (writemaxcnt > UINT32_MAX) ? UINT32_MAX : writemaxcnt;
+
+ if (writeblockcnt) {
+ temp = writeblockcnt * blksize;
+ temp = (temp > UINT32_MAX) ? UINT32_MAX : temp;
+
+ if (temp < mp->mnt_maxwritecnt)
+ mp->mnt_maxwritecnt = (u_int32_t)temp;
+ }
+
+ if (readsegcnt) {
+ temp = (readsegcnt > UINT16_MAX) ? UINT16_MAX : readsegcnt;
+ } else {
+ temp = mp->mnt_maxreadcnt / PAGE_SIZE;
+
+ if (temp > UINT16_MAX)
+ temp = UINT16_MAX;
+ }
+ mp->mnt_segreadcnt = (u_int16_t)temp;
+
+ if (writesegcnt) {
+ temp = (writesegcnt > UINT16_MAX) ? UINT16_MAX : writesegcnt;
+ } else {
+ temp = mp->mnt_maxwritecnt / PAGE_SIZE;
+
+ if (temp > UINT16_MAX)
+ temp = UINT16_MAX;
+ }
+ mp->mnt_segwritecnt = (u_int16_t)temp;
+
+ if (readsegsize)
+ temp = (readsegsize > UINT32_MAX) ? UINT32_MAX : readsegsize;
+ else
+ temp = mp->mnt_maxreadcnt;
+ mp->mnt_maxsegreadsize = (u_int32_t)temp;
+
+ if (writesegsize)
+ temp = (writesegsize > UINT32_MAX) ? UINT32_MAX : writesegsize;
+ else
+ temp = mp->mnt_maxwritecnt;
+ mp->mnt_maxsegwritesize = (u_int32_t)temp;
+
+ if (alignment)
+ temp = (alignment > PAGE_SIZE) ? PAGE_MASK : alignment - 1;
+ else
+ temp = 0;
+ mp->mnt_alignmentmask = temp;
+
+
+ if (ioqueue_depth > MNT_DEFAULT_IOQUEUE_DEPTH)
+ temp = ioqueue_depth;
+ else
+ temp = MNT_DEFAULT_IOQUEUE_DEPTH;
+
+ mp->mnt_ioqueue_depth = temp;
+ mp->mnt_ioscale = (mp->mnt_ioqueue_depth + (MNT_DEFAULT_IOQUEUE_DEPTH - 1)) / MNT_DEFAULT_IOQUEUE_DEPTH;
+
+ if (mp->mnt_ioscale > 1)
+ printf("ioqueue_depth = %d, ioscale = %d\n", (int)mp->mnt_ioqueue_depth, (int)mp->mnt_ioscale);
+
+ if (features & DK_FEATURE_FORCE_UNIT_ACCESS)
+ mp->mnt_ioflags |= MNT_IOFLAGS_FUA_SUPPORTED;
+ if (features & DK_FEATURE_UNMAP)
+ mp->mnt_ioflags |= MNT_IOFLAGS_UNMAP_SUPPORTED;
+ return (error);
+}
+
+static struct klist fs_klist;
+lck_grp_t *fs_klist_lck_grp;
+lck_mtx_t *fs_klist_lock;
+
+void
+vfs_event_init(void)
+{
+
+ klist_init(&fs_klist);
+ fs_klist_lck_grp = lck_grp_alloc_init("fs_klist", NULL);
+ fs_klist_lock = lck_mtx_alloc_init(fs_klist_lck_grp, NULL);
+}
+
+void
+vfs_event_signal(__unused fsid_t *fsid, u_int32_t event, __unused intptr_t data)
+{
+ lck_mtx_lock(fs_klist_lock);
+ KNOTE(&fs_klist, event);
+ lck_mtx_unlock(fs_klist_lock);
+}
+
+/*
+ * return the number of mounted filesystems.
+ */
+static int
+sysctl_vfs_getvfscnt(void)
+{
+ return(mount_getvfscnt());
+}
+
+
+static int
+mount_getvfscnt(void)
+{
+ int ret;
+
+ mount_list_lock();
+ ret = nummounts;
+ mount_list_unlock();
+ return (ret);
+
+}
+
+
+
+static int
+mount_fillfsids(fsid_t *fsidlst, int count)
+{
+ struct mount *mp;
+ int actual=0;
+
+ actual = 0;
+ mount_list_lock();
+ TAILQ_FOREACH(mp, &mountlist, mnt_list) {
+ if (actual <= count) {
+ fsidlst[actual] = mp->mnt_vfsstat.f_fsid;
+ actual++;
+ }
+ }
+ mount_list_unlock();
+ return (actual);
+
+}
+
+/*
+ * fill in the array of fsid_t's up to a max of 'count', the actual
+ * number filled in will be set in '*actual'. If there are more fsid_t's
+ * than room in fsidlst then ENOMEM will be returned and '*actual' will
+ * have the actual count.
+ * having *actual filled out even in the error case is depended upon.
+ */
+static int
+sysctl_vfs_getvfslist(fsid_t *fsidlst, int count, int *actual)
+{
+ struct mount *mp;
+
+ *actual = 0;
+ mount_list_lock();
+ TAILQ_FOREACH(mp, &mountlist, mnt_list) {
+ (*actual)++;
+ if (*actual <= count)
+ fsidlst[(*actual) - 1] = mp->mnt_vfsstat.f_fsid;
+ }
+ mount_list_unlock();
+ return (*actual <= count ? 0 : ENOMEM);
+}
+
+static int
+sysctl_vfs_vfslist(__unused struct sysctl_oid *oidp, __unused void *arg1,
+ __unused int arg2, struct sysctl_req *req)
+{
+ int actual, error;
+ size_t space;
+ fsid_t *fsidlst;
+
+ /* This is a readonly node. */
+ if (req->newptr != USER_ADDR_NULL)
+ return (EPERM);
+
+ /* they are querying us so just return the space required. */
+ if (req->oldptr == USER_ADDR_NULL) {
+ req->oldidx = sysctl_vfs_getvfscnt() * sizeof(fsid_t);
+ return 0;
+ }
+again:
+ /*
+ * Retrieve an accurate count of the amount of space required to copy
+ * out all the fsids in the system.
+ */
+ space = req->oldlen;
+ req->oldlen = sysctl_vfs_getvfscnt() * sizeof(fsid_t);
+
+ /* they didn't give us enough space. */
+ if (space < req->oldlen)
+ return (ENOMEM);
+
+ MALLOC(fsidlst, fsid_t *, req->oldlen, M_TEMP, M_WAITOK);
+ if (fsidlst == NULL) {
+ return (ENOMEM);
+ }
+
+ error = sysctl_vfs_getvfslist(fsidlst, req->oldlen / sizeof(fsid_t),
+ &actual);
+ /*
+ * If we get back ENOMEM, then another mount has been added while we
+ * slept in malloc above. If this is the case then try again.
+ */
+ if (error == ENOMEM) {
+ FREE(fsidlst, M_TEMP);
+ req->oldlen = space;
+ goto again;
+ }
+ if (error == 0) {
+ error = SYSCTL_OUT(req, fsidlst, actual * sizeof(fsid_t));
+ }
+ FREE(fsidlst, M_TEMP);
+ return (error);
+}
+
+/*
+ * Do a sysctl by fsid.
+ */
+static int
+sysctl_vfs_ctlbyfsid(__unused struct sysctl_oid *oidp, void *arg1, int arg2,
+ struct sysctl_req *req)
+{
+ union union_vfsidctl vc;
+ struct mount *mp;
+ struct vfsstatfs *sp;
+ int *name, flags, namelen;
+ int error=0, gotref=0;
+ vfs_context_t ctx = vfs_context_current();
+ proc_t p = req->p; /* XXX req->p != current_proc()? */
+ boolean_t is_64_bit;
+
+ name = arg1;
+ namelen = arg2;
+ is_64_bit = proc_is64bit(p);
+
+ error = SYSCTL_IN(req, &vc, is_64_bit? sizeof(vc.vc64):sizeof(vc.vc32));
+ if (error)
+ goto out;
+ if (vc.vc32.vc_vers != VFS_CTL_VERS1) { /* works for 32 and 64 */
+ error = EINVAL;
+ goto out;
+ }
+ mp = mount_list_lookupby_fsid(&vc.vc32.vc_fsid, 0, 1); /* works for 32 and 64 */
+ if (mp == NULL) {
+ error = ENOENT;
+ goto out;
+ }
+ gotref = 1;
+ /* reset so that the fs specific code can fetch it. */
+ req->newidx = 0;
+ /*
+ * Note if this is a VFS_CTL then we pass the actual sysctl req
+ * in for "oldp" so that the lower layer can DTRT and use the
+ * SYSCTL_IN/OUT routines.
+ */
+ if (mp->mnt_op->vfs_sysctl != NULL) {
+ if (is_64_bit) {
+ if (vfs_64bitready(mp)) {
+ error = mp->mnt_op->vfs_sysctl(name, namelen,
+ CAST_USER_ADDR_T(req),
+ NULL, USER_ADDR_NULL, 0,
+ ctx);
+ }
+ else {
+ error = ENOTSUP;
+ }
+ }
+ else {
+ error = mp->mnt_op->vfs_sysctl(name, namelen,
+ CAST_USER_ADDR_T(req),
+ NULL, USER_ADDR_NULL, 0,
+ ctx);
+ }
+ if (error != ENOTSUP) {
+ goto out;
+ }
+ }
+ switch (name[0]) {
+ case VFS_CTL_UMOUNT:
+ req->newidx = 0;
+ if (is_64_bit) {
+ req->newptr = vc.vc64.vc_ptr;
+ req->newlen = (size_t)vc.vc64.vc_len;
+ }
+ else {
+ req->newptr = CAST_USER_ADDR_T(vc.vc32.vc_ptr);
+ req->newlen = vc.vc32.vc_len;
+ }
+ error = SYSCTL_IN(req, &flags, sizeof(flags));
+ if (error)
+ break;
+
+ mount_ref(mp, 0);
+ mount_iterdrop(mp);
+ gotref = 0;
+ /* safedounmount consumes a ref */
+ error = safedounmount(mp, flags, ctx);
+ break;
+ case VFS_CTL_STATFS:
+ req->newidx = 0;
+ if (is_64_bit) {
+ req->newptr = vc.vc64.vc_ptr;
+ req->newlen = (size_t)vc.vc64.vc_len;
+ }
+ else {
+ req->newptr = CAST_USER_ADDR_T(vc.vc32.vc_ptr);
+ req->newlen = vc.vc32.vc_len;
+ }
+ error = SYSCTL_IN(req, &flags, sizeof(flags));
+ if (error)
+ break;
+ sp = &mp->mnt_vfsstat;
+ if (((flags & MNT_NOWAIT) == 0 || (flags & (MNT_WAIT | MNT_DWAIT))) &&
+ (error = vfs_update_vfsstat(mp, ctx, VFS_USER_EVENT)))
+ goto out;
+ if (is_64_bit) {
+ struct user64_statfs sfs;
+ bzero(&sfs, sizeof(sfs));
+ sfs.f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+ sfs.f_type = mp->mnt_vtable->vfc_typenum;
+ sfs.f_bsize = (user64_long_t)sp->f_bsize;
+ sfs.f_iosize = (user64_long_t)sp->f_iosize;
+ sfs.f_blocks = (user64_long_t)sp->f_blocks;
+ sfs.f_bfree = (user64_long_t)sp->f_bfree;
+ sfs.f_bavail = (user64_long_t)sp->f_bavail;
+ sfs.f_files = (user64_long_t)sp->f_files;
+ sfs.f_ffree = (user64_long_t)sp->f_ffree;
+ sfs.f_fsid = sp->f_fsid;
+ sfs.f_owner = sp->f_owner;
+
+ if (mp->mnt_kern_flag & MNTK_TYPENAME_OVERRIDE) {
+ strlcpy(&sfs.f_fstypename[0], &mp->fstypename_override[0], MFSTYPENAMELEN);
+ } else {
+ strlcpy(sfs.f_fstypename, sp->f_fstypename, MFSNAMELEN);
+ }
+ strlcpy(sfs.f_mntonname, sp->f_mntonname, MNAMELEN);
+ strlcpy(sfs.f_mntfromname, sp->f_mntfromname, MNAMELEN);
+
+ error = SYSCTL_OUT(req, &sfs, sizeof(sfs));
+ }
+ else {
+ struct user32_statfs sfs;
+ bzero(&sfs, sizeof(sfs));
+ sfs.f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+ sfs.f_type = mp->mnt_vtable->vfc_typenum;
+
+ /*
+ * It's possible for there to be more than 2^^31 blocks in the filesystem, so we
+ * have to fudge the numbers here in that case. We inflate the blocksize in order
+ * to reflect the filesystem size as best we can.
+ */
+ if (sp->f_blocks > INT_MAX) {
+ int shift;
+
+ /*
+ * Work out how far we have to shift the block count down to make it fit.
+ * Note that it's possible to have to shift so far that the resulting
+ * blocksize would be unreportably large. At that point, we will clip
+ * any values that don't fit.
+ *
+ * For safety's sake, we also ensure that f_iosize is never reported as
+ * being smaller than f_bsize.
+ */
+ for (shift = 0; shift < 32; shift++) {
+ if ((sp->f_blocks >> shift) <= INT_MAX)
+ break;
+ if ((((long long)sp->f_bsize) << (shift + 1)) > INT_MAX)
+ break;
+ }
+#define __SHIFT_OR_CLIP(x, s) ((((x) >> (s)) > INT_MAX) ? INT_MAX : ((x) >> (s)))
+ sfs.f_blocks = (user32_long_t)__SHIFT_OR_CLIP(sp->f_blocks, shift);
+ sfs.f_bfree = (user32_long_t)__SHIFT_OR_CLIP(sp->f_bfree, shift);
+ sfs.f_bavail = (user32_long_t)__SHIFT_OR_CLIP(sp->f_bavail, shift);
+#undef __SHIFT_OR_CLIP
+ sfs.f_bsize = (user32_long_t)(sp->f_bsize << shift);
+ sfs.f_iosize = lmax(sp->f_iosize, sp->f_bsize);
+ } else {
+ sfs.f_bsize = (user32_long_t)sp->f_bsize;
+ sfs.f_iosize = (user32_long_t)sp->f_iosize;
+ sfs.f_blocks = (user32_long_t)sp->f_blocks;
+ sfs.f_bfree = (user32_long_t)sp->f_bfree;
+ sfs.f_bavail = (user32_long_t)sp->f_bavail;
+ }
+ sfs.f_files = (user32_long_t)sp->f_files;
+ sfs.f_ffree = (user32_long_t)sp->f_ffree;
+ sfs.f_fsid = sp->f_fsid;
+ sfs.f_owner = sp->f_owner;
+
+ if (mp->mnt_kern_flag & MNTK_TYPENAME_OVERRIDE) {
+ strlcpy(&sfs.f_fstypename[0], &mp->fstypename_override[0], MFSTYPENAMELEN);
+ } else {
+ strlcpy(sfs.f_fstypename, sp->f_fstypename, MFSNAMELEN);
+ }
+ strlcpy(sfs.f_mntonname, sp->f_mntonname, MNAMELEN);
+ strlcpy(sfs.f_mntfromname, sp->f_mntfromname, MNAMELEN);
+
+ error = SYSCTL_OUT(req, &sfs, sizeof(sfs));
+ }
+ break;
+ default:
+ error = ENOTSUP;
+ goto out;
+ }
+out:
+ if(gotref != 0)
+ mount_iterdrop(mp);
+ return (error);
+}
+
+static int filt_fsattach(struct knote *kn);
+static void filt_fsdetach(struct knote *kn);
+static int filt_fsevent(struct knote *kn, long hint);
+struct filterops fs_filtops = {
+ .f_attach = filt_fsattach,
+ .f_detach = filt_fsdetach,
+ .f_event = filt_fsevent,
+};
+
+static int
+filt_fsattach(struct knote *kn)
+{
+
+ lck_mtx_lock(fs_klist_lock);
+ kn->kn_flags |= EV_CLEAR;
+ KNOTE_ATTACH(&fs_klist, kn);
+ lck_mtx_unlock(fs_klist_lock);
+ return (0);
+}
+
+static void
+filt_fsdetach(struct knote *kn)
+{
+ lck_mtx_lock(fs_klist_lock);
+ KNOTE_DETACH(&fs_klist, kn);
+ lck_mtx_unlock(fs_klist_lock);
+}
+
+static int
+filt_fsevent(struct knote *kn, long hint)
+{
+ /*
+ * Backwards compatibility:
+ * Other filters would do nothing if kn->kn_sfflags == 0
+ */
+
+ if ((kn->kn_sfflags == 0) || (kn->kn_sfflags & hint)) {
+ kn->kn_fflags |= hint;
+ }
+
+ return (kn->kn_fflags != 0);
+}
+
+static int
+sysctl_vfs_noremotehang(__unused struct sysctl_oid *oidp,
+ __unused void *arg1, __unused int arg2, struct sysctl_req *req)
+{
+ int out, error;
+ pid_t pid;
+ proc_t p;
+
+ /* We need a pid. */
+ if (req->newptr == USER_ADDR_NULL)
+ return (EINVAL);
+
+ error = SYSCTL_IN(req, &pid, sizeof(pid));
+ if (error)
+ return (error);
+
+ p = proc_find(pid < 0 ? -pid : pid);
+ if (p == NULL)
+ return (ESRCH);
+
+ /*
+ * Fetching the value is ok, but we only fetch if the old
+ * pointer is given.
+ */
+ if (req->oldptr != USER_ADDR_NULL) {
+ out = !((p->p_flag & P_NOREMOTEHANG) == 0);
+ proc_rele(p);
+ error = SYSCTL_OUT(req, &out, sizeof(out));
+ return (error);
+ }
+
+ /* cansignal offers us enough security. */
+ if (p != req->p && proc_suser(req->p) != 0) {
+ proc_rele(p);
+ return (EPERM);
+ }
+
+ if (pid < 0)
+ OSBitAndAtomic(~((uint32_t)P_NOREMOTEHANG), &p->p_flag);
+ else
+ OSBitOrAtomic(P_NOREMOTEHANG, &p->p_flag);
+ proc_rele(p);
+
+ return (0);
+}
+
+/* the vfs.generic. branch. */
+SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RW | CTLFLAG_LOCKED, NULL, "vfs generic hinge");
+/* retreive a list of mounted filesystem fsid_t */
+SYSCTL_PROC(_vfs_generic, OID_AUTO, vfsidlist, CTLFLAG_RD | CTLFLAG_LOCKED,
+ NULL, 0, sysctl_vfs_vfslist, "S,fsid", "List of mounted filesystem ids");
+/* perform operations on filesystem via fsid_t */
+SYSCTL_NODE(_vfs_generic, OID_AUTO, ctlbyfsid, CTLFLAG_RW | CTLFLAG_LOCKED,
+ sysctl_vfs_ctlbyfsid, "ctlbyfsid");
+SYSCTL_PROC(_vfs_generic, OID_AUTO, noremotehang, CTLFLAG_RW | CTLFLAG_ANYBODY,
+ NULL, 0, sysctl_vfs_noremotehang, "I", "noremotehang");
+
+
+long num_reusedvnodes = 0;
+
+static int
+new_vnode(vnode_t *vpp)
+{
+ vnode_t vp;
+ int retries = 0; /* retry incase of tablefull */
+ int force_alloc = 0, walk_count = 0;
+ unsigned int vpid;
+ struct timespec ts;
+ struct timeval current_tv;
+#ifndef __LP64__
+ struct unsafe_fsnode *l_unsafefs = 0;
+#endif /* __LP64__ */
+ proc_t curproc = current_proc();
+
+retry:
+ microuptime(¤t_tv);
+
+ vp = NULLVP;
+
+ vnode_list_lock();
+
+ if ((numvnodes - deadvnodes) < desiredvnodes || force_alloc) {
+ if ( !TAILQ_EMPTY(&vnode_dead_list)) {
+ /*
+ * Can always reuse a dead one
+ */
+ vp = TAILQ_FIRST(&vnode_dead_list);
+ goto steal_this_vp;
+ }
+ /*
+ * no dead vnodes available... if we're under
+ * the limit, we'll create a new vnode
+ */
+ numvnodes++;
+ vnode_list_unlock();
+
+ MALLOC_ZONE(vp, struct vnode *, sizeof(*vp), M_VNODE, M_WAITOK);
+ bzero((char *)vp, sizeof(*vp));
+ VLISTNONE(vp); /* avoid double queue removal */
+ lck_mtx_init(&vp->v_lock, vnode_lck_grp, vnode_lck_attr);
+
+ klist_init(&vp->v_knotes);
+ nanouptime(&ts);
+ vp->v_id = ts.tv_nsec;
+ vp->v_flag = VSTANDARD;
+
+#if CONFIG_MACF
+ if (mac_vnode_label_init_needed(vp))
+ mac_vnode_label_init(vp);
+#endif /* MAC */
+
+ vp->v_iocount = 1;
+ goto done;
+ }
+
+#define MAX_WALK_COUNT 1000
+
+ if ( !TAILQ_EMPTY(&vnode_rage_list) &&
+ (ragevnodes >= rage_limit ||
+ (current_tv.tv_sec - rage_tv.tv_sec) >= RAGE_TIME_LIMIT)) {
+
+ TAILQ_FOREACH(vp, &vnode_rage_list, v_freelist) {
+ if ( !(vp->v_listflag & VLIST_RAGE))
+ panic("new_vnode: vp (%p) on RAGE list not marked VLIST_RAGE", vp);
+
+ // if we're a dependency-capable process, skip vnodes that can
+ // cause recycling deadlocks. (i.e. this process is diskimages
+ // helper and the vnode is in a disk image). Querying the
+ // mnt_kern_flag for the mount's virtual device status
+ // is safer than checking the mnt_dependent_process, which
+ // may not be updated if there are multiple devnode layers
+ // in between the disk image and the final consumer.
+
+ if ((curproc->p_flag & P_DEPENDENCY_CAPABLE) == 0 || vp->v_mount == NULL ||
+ (vp->v_mount->mnt_kern_flag & MNTK_VIRTUALDEV) == 0) {
+ break;
+ }
+
+ // don't iterate more than MAX_WALK_COUNT vnodes to
+ // avoid keeping the vnode list lock held for too long.
+ if (walk_count++ > MAX_WALK_COUNT) {
+ vp = NULL;
+ break;
+ }
+ }
+
+ }
+
+ if (vp == NULL && !TAILQ_EMPTY(&vnode_free_list)) {
+ /*
+ * Pick the first vp for possible reuse
+ */
+ walk_count = 0;
+ TAILQ_FOREACH(vp, &vnode_free_list, v_freelist) {
+
+ // if we're a dependency-capable process, skip vnodes that can
+ // cause recycling deadlocks. (i.e. this process is diskimages
+ // helper and the vnode is in a disk image). Querying the
+ // mnt_kern_flag for the mount's virtual device status
+ // is safer than checking the mnt_dependent_process, which
+ // may not be updated if there are multiple devnode layers
+ // in between the disk image and the final consumer.
+
+ if ((curproc->p_flag & P_DEPENDENCY_CAPABLE) == 0 || vp->v_mount == NULL ||
+ (vp->v_mount->mnt_kern_flag & MNTK_VIRTUALDEV) == 0) {
+ break;
+ }
+
+ // don't iterate more than MAX_WALK_COUNT vnodes to
+ // avoid keeping the vnode list lock held for too long.
+ if (walk_count++ > MAX_WALK_COUNT) {
+ vp = NULL;
+ break;
+ }
+ }
+
+ }
+
+ //
+ // if we don't have a vnode and the walk_count is >= MAX_WALK_COUNT
+ // then we're trying to create a vnode on behalf of a
+ // process like diskimages-helper that has file systems
+ // mounted on top of itself (and thus we can't reclaim
+ // vnodes in the file systems on top of us). if we can't
+ // find a vnode to reclaim then we'll just have to force
+ // the allocation.
+ //
+ if (vp == NULL && walk_count >= MAX_WALK_COUNT) {
+ force_alloc = 1;
+ vnode_list_unlock();
+ goto retry;
+ }
+
+ if (vp == NULL) {
+ /*
+ * we've reached the system imposed maximum number of vnodes
+ * but there isn't a single one available
+ * wait a bit and then retry... if we can't get a vnode
+ * after 100 retries, than log a complaint
+ */
+ if (++retries <= 100) {
+ vnode_list_unlock();
+ delay_for_interval(1, 1000 * 1000);
+ goto retry;
+ }
+
+ vnode_list_unlock();
+ tablefull("vnode");
+ log(LOG_EMERG, "%d desired, %d numvnodes, "
+ "%d free, %d dead, %d rage\n",
+ desiredvnodes, numvnodes, freevnodes, deadvnodes, ragevnodes);
+#if CONFIG_EMBEDDED
+ /*
+ * Running out of vnodes tends to make a system unusable. Start killing
+ * processes that jetsam knows are killable.
+ */
+ if (jetsam_kill_top_proc(TRUE, kJetsamFlagsKilledVnodes) < 0) {
+ /*
+ * If jetsam can't find any more processes to kill and there
+ * still aren't any free vnodes, panic. Hopefully we'll get a
+ * panic log to tell us why we ran out.
+ */
+ panic("vnode table is full\n");
+ }
+
+ delay_for_interval(1, 1000 * 1000);
+ goto retry;
+#endif
+
+ *vpp = NULL;
+ return (ENFILE);
+ }
+steal_this_vp:
+ vpid = vp->v_id;
+
+ vnode_list_remove_locked(vp);
+
+ vnode_list_unlock();
+
+ vnode_lock_spin(vp);
+
+ /*
+ * We could wait for the vnode_lock after removing the vp from the freelist
+ * and the vid is bumped only at the very end of reclaim. So it is possible
+ * that we are looking at a vnode that is being terminated. If so skip it.
+ */
+ if ((vpid != vp->v_id) || (vp->v_usecount != 0) || (vp->v_iocount != 0) ||
+ VONLIST(vp) || (vp->v_lflag & VL_TERMINATE)) {
+ /*
+ * we lost the race between dropping the list lock
+ * and picking up the vnode_lock... someone else
+ * used this vnode and it is now in a new state
+ * so we need to go back and try again
+ */
+ vnode_unlock(vp);
+ goto retry;
+ }
+ if ( (vp->v_lflag & (VL_NEEDINACTIVE | VL_MARKTERM)) == VL_NEEDINACTIVE ) {
+ /*
+ * we did a vnode_rele_ext that asked for
+ * us not to reenter the filesystem during
+ * the release even though VL_NEEDINACTIVE was
+ * set... we'll do it here by doing a
+ * vnode_get/vnode_put
+ *
+ * pick up an iocount so that we can call
+ * vnode_put and drive the VNOP_INACTIVE...
+ * vnode_put will either leave us off
+ * the freelist if a new ref comes in,
+ * or put us back on the end of the freelist
+ * or recycle us if we were marked for termination...
+ * so we'll just go grab a new candidate
+ */
+ vp->v_iocount++;
+#ifdef JOE_DEBUG
+ record_vp(vp, 1);
+#endif
+ vnode_put_locked(vp);
+ vnode_unlock(vp);
+ goto retry;
+ }
+ OSAddAtomicLong(1, &num_reusedvnodes);
+
+ /* Checks for anyone racing us for recycle */
+ if (vp->v_type != VBAD) {
+ if (vp->v_lflag & VL_DEAD)
+ panic("new_vnode(%p): the vnode is VL_DEAD but not VBAD", vp);
+ vnode_lock_convert(vp);
+ (void)vnode_reclaim_internal(vp, 1, 1, 0);
+
+ if ((VONLIST(vp)))
+ panic("new_vnode(%p): vp on list", vp);
+ if (vp->v_usecount || vp->v_iocount || vp->v_kusecount ||
+ (vp->v_lflag & (VNAMED_UBC | VNAMED_MOUNT | VNAMED_FSHASH)))
+ panic("new_vnode(%p): free vnode still referenced", vp);
+ if ((vp->v_mntvnodes.tqe_prev != 0) && (vp->v_mntvnodes.tqe_next != 0))
+ panic("new_vnode(%p): vnode seems to be on mount list", vp);
+ if ( !LIST_EMPTY(&vp->v_nclinks) || !LIST_EMPTY(&vp->v_ncchildren))
+ panic("new_vnode(%p): vnode still hooked into the name cache", vp);
+ }
+
+#ifndef __LP64__
+ if (vp->v_unsafefs) {
+ l_unsafefs = vp->v_unsafefs;
+ vp->v_unsafefs = (struct unsafe_fsnode *)NULL;
+ }
+#endif /* __LP64__ */
+
+#if CONFIG_MACF
+ /*
+ * We should never see VL_LABELWAIT or VL_LABEL here.
+ * as those operations hold a reference.
+ */
+ assert ((vp->v_lflag & VL_LABELWAIT) != VL_LABELWAIT);
+ assert ((vp->v_lflag & VL_LABEL) != VL_LABEL);
+ if (vp->v_lflag & VL_LABELED) {
+ vnode_lock_convert(vp);
+ mac_vnode_label_recycle(vp);
+ } else if (mac_vnode_label_init_needed(vp)) {
+ vnode_lock_convert(vp);
+ mac_vnode_label_init(vp);
+ }
+
+#endif /* MAC */
+
+ vp->v_iocount = 1;
+ vp->v_lflag = 0;
+ vp->v_writecount = 0;
+ vp->v_references = 0;
+ vp->v_iterblkflags = 0;
+ vp->v_flag = VSTANDARD;
+ /* vbad vnodes can point to dead_mountp */
+ vp->v_mount = NULL;
+ vp->v_defer_reclaimlist = (vnode_t)0;
+
+ vnode_unlock(vp);
+
+#ifndef __LP64__
+ if (l_unsafefs) {
+ lck_mtx_destroy(&l_unsafefs->fsnodelock, vnode_lck_grp);
+ FREE_ZONE((void *)l_unsafefs, sizeof(struct unsafe_fsnode), M_UNSAFEFS);
+ }
+#endif /* __LP64__ */
+
+done:
+ *vpp = vp;
+
+ return (0);
+}
+
+void
+vnode_lock(vnode_t vp)
+{
+ lck_mtx_lock(&vp->v_lock);
+}
+
+void
+vnode_lock_spin(vnode_t vp)
+{
+ lck_mtx_lock_spin(&vp->v_lock);
+}
+
+void
+vnode_unlock(vnode_t vp)
+{
+ lck_mtx_unlock(&vp->v_lock);
+}
+
+
+
+int
+vnode_get(struct vnode *vp)
+{
+ int retval;
+
+ vnode_lock_spin(vp);
+ retval = vnode_get_locked(vp);
+ vnode_unlock(vp);
+
+ return(retval);
+}
+
+int
+vnode_get_locked(struct vnode *vp)
+{
+#if DIAGNOSTIC
+ lck_mtx_assert(&vp->v_lock, LCK_MTX_ASSERT_OWNED);
+#endif
+ if ((vp->v_iocount == 0) && (vp->v_lflag & (VL_TERMINATE | VL_DEAD))) {
+ return(ENOENT);
+ }
+ vp->v_iocount++;
+#ifdef JOE_DEBUG
+ record_vp(vp, 1);
+#endif
+ return (0);
+}
+
+/*
+ * vnode_getwithvid() cuts in line in front of a vnode drain (that is,
+ * while the vnode is draining, but at no point after that) to prevent
+ * deadlocks when getting vnodes from filesystem hashes while holding
+ * resources that may prevent other iocounts from being released.
+ */
+int
+vnode_getwithvid(vnode_t vp, uint32_t vid)
+{
+ return(vget_internal(vp, vid, ( VNODE_NODEAD | VNODE_WITHID | VNODE_DRAINO )));
+}
+
+/*
+ * vnode_getwithvid_drainok() is like vnode_getwithvid(), but *does* block behind a vnode
+ * drain; it exists for use in the VFS name cache, where we really do want to block behind
+ * vnode drain to prevent holding off an unmount.
+ */
+int
+vnode_getwithvid_drainok(vnode_t vp, uint32_t vid)
+{
+ return(vget_internal(vp, vid, ( VNODE_NODEAD | VNODE_WITHID )));
+}
+
+int
+vnode_getwithref(vnode_t vp)
+{
+ return(vget_internal(vp, 0, 0));
+}
+
+
+__private_extern__ int
+vnode_getalways(vnode_t vp)
+{
+ return(vget_internal(vp, 0, VNODE_ALWAYS));
+}
+
+int
+vnode_put(vnode_t vp)
+{
+ int retval;
+
+ vnode_lock_spin(vp);
+ retval = vnode_put_locked(vp);
+ vnode_unlock(vp);
+
+ return(retval);
+}
+
+int
+vnode_put_locked(vnode_t vp)
+{
+ vfs_context_t ctx = vfs_context_current(); /* hoist outside loop */
+
+#if DIAGNOSTIC
+ lck_mtx_assert(&vp->v_lock, LCK_MTX_ASSERT_OWNED);
+#endif
+retry:
+ if (vp->v_iocount < 1)
+ panic("vnode_put(%p): iocount < 1", vp);
+
+ if ((vp->v_usecount > 0) || (vp->v_iocount > 1)) {
+ vnode_dropiocount(vp);
+ return(0);
+ }
+ if ((vp->v_lflag & (VL_DEAD | VL_NEEDINACTIVE)) == VL_NEEDINACTIVE) {
+
+ vp->v_lflag &= ~VL_NEEDINACTIVE;
+ vnode_unlock(vp);
+
+ VNOP_INACTIVE(vp, ctx);
+
+ vnode_lock_spin(vp);
+ /*
+ * because we had to drop the vnode lock before calling
+ * VNOP_INACTIVE, the state of this vnode may have changed...
+ * we may pick up both VL_MARTERM and either
+ * an iocount or a usecount while in the VNOP_INACTIVE call
+ * we don't want to call vnode_reclaim_internal on a vnode
+ * that has active references on it... so loop back around
+ * and reevaluate the state
+ */
+ goto retry;
+ }
+ vp->v_lflag &= ~VL_NEEDINACTIVE;
+
+ if ((vp->v_lflag & (VL_MARKTERM | VL_TERMINATE | VL_DEAD)) == VL_MARKTERM) {
+ vnode_lock_convert(vp);
+ vnode_reclaim_internal(vp, 1, 1, 0);
+ }
+ vnode_dropiocount(vp);
+ vnode_list_add(vp);
+
+ return(0);
+}
+
+/* is vnode_t in use by others? */
+int
+vnode_isinuse(vnode_t vp, int refcnt)
+{
+ return(vnode_isinuse_locked(vp, refcnt, 0));
+}
+
+
+static int
+vnode_isinuse_locked(vnode_t vp, int refcnt, int locked)
+{
+ int retval = 0;
+
+ if (!locked)
+ vnode_lock_spin(vp);
+ if ((vp->v_type != VREG) && ((vp->v_usecount - vp->v_kusecount) > refcnt)) {
+ retval = 1;
+ goto out;
+ }
+ if (vp->v_type == VREG) {
+ retval = ubc_isinuse_locked(vp, refcnt, 1);
+ }
+
+out:
+ if (!locked)
+ vnode_unlock(vp);
+ return(retval);
+}
+
+
+/* resume vnode_t */
+errno_t
+vnode_resume(vnode_t vp)
+{
+ if ((vp->v_lflag & VL_SUSPENDED) && vp->v_owner == current_thread()) {
+
+ vnode_lock_spin(vp);
+ vp->v_lflag &= ~VL_SUSPENDED;
+ vp->v_owner = NULL;
+ vnode_unlock(vp);
+
+ wakeup(&vp->v_iocount);
+ }
+ return(0);
+}
+
+/* suspend vnode_t
+ * Please do not use on more than one vnode at a time as it may
+ * cause deadlocks.
+ * xxx should we explicity prevent this from happening?
+ */
+
+errno_t
+vnode_suspend(vnode_t vp)
+{
+ if (vp->v_lflag & VL_SUSPENDED) {
+ return(EBUSY);
+ }
+
+ vnode_lock_spin(vp);
+
+ /*
+ * xxx is this sufficient to check if a vnode_drain is
+ * progress?
+ */
+
+ if (vp->v_owner == NULL) {
+ vp->v_lflag |= VL_SUSPENDED;
+ vp->v_owner = current_thread();
+ }
+ vnode_unlock(vp);
+
+ return(0);
+}
+
+
+
+static errno_t
+vnode_drain(vnode_t vp)
+{
+
+ if (vp->v_lflag & VL_DRAIN) {
+ panic("vnode_drain: recursive drain");
+ return(ENOENT);
+ }
+ vp->v_lflag |= VL_DRAIN;
+ vp->v_owner = current_thread();
+
+ while (vp->v_iocount > 1)
+ msleep(&vp->v_iocount, &vp->v_lock, PVFS, "vnode_drain", NULL);
+
+ vp->v_lflag &= ~VL_DRAIN;
+
+ return(0);
+}
+
+
+/*
+ * if the number of recent references via vnode_getwithvid or vnode_getwithref
+ * exceeds this threshold, than 'UN-AGE' the vnode by removing it from
+ * the LRU list if it's currently on it... once the iocount and usecount both drop
+ * to 0, it will get put back on the end of the list, effectively making it younger
+ * this allows us to keep actively referenced vnodes in the list without having
+ * to constantly remove and add to the list each time a vnode w/o a usecount is
+ * referenced which costs us taking and dropping a global lock twice.
+ */
+#define UNAGE_THRESHHOLD 25
+
+errno_t
+vnode_getiocount(vnode_t vp, unsigned int vid, int vflags)
+{
+ int nodead = vflags & VNODE_NODEAD;
+ int nosusp = vflags & VNODE_NOSUSPEND;
+ int always = vflags & VNODE_ALWAYS;
+ int beatdrain = vflags & VNODE_DRAINO;
+
+ for (;;) {
+ /*
+ * if it is a dead vnode with deadfs
+ */
+ if (nodead && (vp->v_lflag & VL_DEAD) && ((vp->v_type == VBAD) || (vp->v_data == 0))) {
+ return(ENOENT);
+ }
+ /*
+ * will return VL_DEAD ones
+ */
+ if ((vp->v_lflag & (VL_SUSPENDED | VL_DRAIN | VL_TERMINATE)) == 0 ) {
+ break;
+ }
+ /*
+ * if suspended vnodes are to be failed
+ */
+ if (nosusp && (vp->v_lflag & VL_SUSPENDED)) {
+ return(ENOENT);
+ }
+ /*
+ * if you are the owner of drain/suspend/termination , can acquire iocount
+ * check for VL_TERMINATE; it does not set owner
+ */
+ if ((vp->v_lflag & (VL_DRAIN | VL_SUSPENDED | VL_TERMINATE)) &&
+ (vp->v_owner == current_thread())) {
+ break;
+ }
+
+ if (always != 0)
+ break;
+
+ /*
+ * In some situations, we want to get an iocount
+ * even if the vnode is draining to prevent deadlock,
+ * e.g. if we're in the filesystem, potentially holding
+ * resources that could prevent other iocounts from
+ * being released.
+ */
+ if (beatdrain && (vp->v_lflag & VL_DRAIN)) {
+ break;
+ }
+
+ vnode_lock_convert(vp);
+
+ if (vp->v_lflag & VL_TERMINATE) {
+ vp->v_lflag |= VL_TERMWANT;
+
+ msleep(&vp->v_lflag, &vp->v_lock, PVFS, "vnode getiocount", NULL);
+ } else
+ msleep(&vp->v_iocount, &vp->v_lock, PVFS, "vnode_getiocount", NULL);
+ }
+ if (((vflags & VNODE_WITHID) != 0) && vid != vp->v_id) {
+ return(ENOENT);
+ }
+ if (++vp->v_references >= UNAGE_THRESHHOLD) {
+ vp->v_references = 0;
+ vnode_list_remove(vp);
+ }
+ vp->v_iocount++;
+#ifdef JOE_DEBUG
+ record_vp(vp, 1);
+#endif
+ return(0);
+}
+
+static void
+vnode_dropiocount (vnode_t vp)
+{
+ if (vp->v_iocount < 1)
+ panic("vnode_dropiocount(%p): v_iocount < 1", vp);
+
+ vp->v_iocount--;
+#ifdef JOE_DEBUG
+ record_vp(vp, -1);
+#endif
+ if ((vp->v_lflag & (VL_DRAIN | VL_SUSPENDED)) && (vp->v_iocount <= 1))
+ wakeup(&vp->v_iocount);
+}
+
+
+void
+vnode_reclaim(struct vnode * vp)
+{
+ vnode_reclaim_internal(vp, 0, 0, 0);
+}
+
+__private_extern__
+void
+vnode_reclaim_internal(struct vnode * vp, int locked, int reuse, int flags)
+{
+ int isfifo = 0;
+
+ if (!locked)
+ vnode_lock(vp);
+
+ if (vp->v_lflag & VL_TERMINATE) {
+ panic("vnode reclaim in progress");
+ }
+ vp->v_lflag |= VL_TERMINATE;
+
+ vn_clearunionwait(vp, 1);
+
+ vnode_drain(vp);
+
+ isfifo = (vp->v_type == VFIFO);
+
+ if (vp->v_type != VBAD)
+ vgone(vp, flags); /* clean and reclaim the vnode */
+
+ /*
+ * give the vnode a new identity so that vnode_getwithvid will fail
+ * on any stale cache accesses...
+ * grab the list_lock so that if we're in "new_vnode"
+ * behind the list_lock trying to steal this vnode, the v_id is stable...
+ * once new_vnode drops the list_lock, it will block trying to take
+ * the vnode lock until we release it... at that point it will evaluate
+ * whether the v_vid has changed
+ * also need to make sure that the vnode isn't on a list where "new_vnode"
+ * can find it after the v_id has been bumped until we are completely done
+ * with the vnode (i.e. putting it back on a list has to be the very last
+ * thing we do to this vnode... many of the callers of vnode_reclaim_internal
+ * are holding an io_count on the vnode... they need to drop the io_count
+ * BEFORE doing a vnode_list_add or make sure to hold the vnode lock until
+ * they are completely done with the vnode
+ */
+ vnode_list_lock();
+
+ vnode_list_remove_locked(vp);
+ vp->v_id++;
+
+ vnode_list_unlock();
+
+ if (isfifo) {
+ struct fifoinfo * fip;
+
+ fip = vp->v_fifoinfo;
+ vp->v_fifoinfo = NULL;
+ FREE(fip, M_TEMP);
+ }
+ vp->v_type = VBAD;
+
+ if (vp->v_data)
+ panic("vnode_reclaim_internal: cleaned vnode isn't");
+ if (vp->v_numoutput)
+ panic("vnode_reclaim_internal: clean vnode has pending I/O's");
+ if (UBCINFOEXISTS(vp))
+ panic("vnode_reclaim_internal: ubcinfo not cleaned");
+ if (vp->v_parent)
+ panic("vnode_reclaim_internal: vparent not removed");
+ if (vp->v_name)
+ panic("vnode_reclaim_internal: vname not removed");
+
+ vp->v_socket = NULL;
+
+ vp->v_lflag &= ~VL_TERMINATE;
+ vp->v_owner = NULL;
+
+ KNOTE(&vp->v_knotes, NOTE_REVOKE);
+
+ /* Make sure that when we reuse the vnode, no knotes left over */
+ klist_init(&vp->v_knotes);
+
+ if (vp->v_lflag & VL_TERMWANT) {
+ vp->v_lflag &= ~VL_TERMWANT;
+ wakeup(&vp->v_lflag);
+ }
+ if (!reuse) {
+ /*
+ * make sure we get on the
+ * dead list if appropriate
+ */
+ vnode_list_add(vp);
+ }
+ if (!locked)
+ vnode_unlock(vp);
+}
+
+/* USAGE:
+ * The following api creates a vnode and associates all the parameter specified in vnode_fsparam
+ * structure and returns a vnode handle with a reference. device aliasing is handled here so checkalias
+ * is obsoleted by this.
+ */
+int
+vnode_create(uint32_t flavor, uint32_t size, void *data, vnode_t *vpp)
+{
+ int error;
+ int insert = 1;
+ vnode_t vp;
+ vnode_t nvp;
+ vnode_t dvp;
+ struct uthread *ut;
+ struct componentname *cnp;
+ struct vnode_fsparam *param = (struct vnode_fsparam *)data;
+#if CONFIG_TRIGGERS
+ struct vnode_trigger_param *tinfo = NULL;
+#endif
+ if (param == NULL)
+ return (EINVAL);
+
+#if CONFIG_TRIGGERS
+ if ((flavor == VNCREATE_TRIGGER) && (size == VNCREATE_TRIGGER_SIZE)) {
+ tinfo = (struct vnode_trigger_param *)data;
+
+ /* Validate trigger vnode input */
+ if ((param->vnfs_vtype != VDIR) ||
+ (tinfo->vnt_resolve_func == NULL) ||
+ (tinfo->vnt_flags & ~VNT_VALID_MASK)) {
+ return (EINVAL);
+ }
+ /* Fall through a normal create (params will be the same) */
+ flavor = VNCREATE_FLAVOR;
+ size = VCREATESIZE;
+ }
+#endif
+ if ((flavor != VNCREATE_FLAVOR) || (size != VCREATESIZE))
+ return (EINVAL);
+
+ if ( (error = new_vnode(&vp)) )
+ return(error);
+
+ dvp = param->vnfs_dvp;
+ cnp = param->vnfs_cnp;
+
+ vp->v_op = param->vnfs_vops;
+ vp->v_type = param->vnfs_vtype;
+ vp->v_data = param->vnfs_fsnode;
+
+ if (param->vnfs_markroot)
+ vp->v_flag |= VROOT;
+ if (param->vnfs_marksystem)
+ vp->v_flag |= VSYSTEM;
+ if (vp->v_type == VREG) {
+ error = ubc_info_init_withsize(vp, param->vnfs_filesize);
+ if (error) {
+#ifdef JOE_DEBUG
+ record_vp(vp, 1);
+#endif
+ vp->v_mount = NULL;
+ vp->v_op = dead_vnodeop_p;
+ vp->v_tag = VT_NON;
+ vp->v_data = NULL;
+ vp->v_type = VBAD;
+ vp->v_lflag |= VL_DEAD;
+
+ vnode_put(vp);
+ return(error);
+ }
+ }
+#ifdef JOE_DEBUG
+ record_vp(vp, 1);
+#endif
+
+#if CONFIG_TRIGGERS
+ /*
+ * For trigger vnodes, attach trigger info to vnode
+ */
+ if ((vp->v_type == VDIR) && (tinfo != NULL)) {
+ /*
+ * Note: has a side effect of incrementing trigger count on the
+ * mount if successful, which we would need to undo on a
+ * subsequent failure.
+ */
+#ifdef JOE_DEBUG
+ record_vp(vp, -1);
+#endif
+ error = vnode_resolver_create(param->vnfs_mp, vp, tinfo, FALSE);
+ if (error) {
+ printf("vnode_create: vnode_resolver_create() err %d\n", error);
+ vp->v_mount = NULL;
+ vp->v_op = dead_vnodeop_p;
+ vp->v_tag = VT_NON;
+ vp->v_data = NULL;
+ vp->v_type = VBAD;
+ vp->v_lflag |= VL_DEAD;
+#ifdef JOE_DEBUG
+ record_vp(vp, 1);
+#endif
+ vnode_put(vp);
+ return (error);
+ }
+ }
+#endif
+ if (vp->v_type == VCHR || vp->v_type == VBLK) {
+
+ vp->v_tag = VT_DEVFS; /* callers will reset if needed (bdevvp) */
+
+ if ( (nvp = checkalias(vp, param->vnfs_rdev)) ) {
+ /*
+ * if checkalias returns a vnode, it will be locked
+ *
+ * first get rid of the unneeded vnode we acquired
+ */
+ vp->v_data = NULL;
+ vp->v_op = spec_vnodeop_p;
+ vp->v_type = VBAD;
+ vp->v_lflag = VL_DEAD;
+ vp->v_data = NULL;
+ vp->v_tag = VT_NON;
+ vnode_put(vp);
+
+ /*
+ * switch to aliased vnode and finish
+ * preparing it
+ */
+ vp = nvp;
+
+ vclean(vp, 0);
+ vp->v_op = param->vnfs_vops;
+ vp->v_type = param->vnfs_vtype;
+ vp->v_data = param->vnfs_fsnode;
+ vp->v_lflag = 0;
+ vp->v_mount = NULL;
+ insmntque(vp, param->vnfs_mp);
+ insert = 0;
+ vnode_unlock(vp);
+ }
+ }
+
+ if (vp->v_type == VFIFO) {
+ struct fifoinfo *fip;
+
+ MALLOC(fip, struct fifoinfo *,
+ sizeof(*fip), M_TEMP, M_WAITOK);
+ bzero(fip, sizeof(struct fifoinfo ));
+ vp->v_fifoinfo = fip;
+ }
+ /* The file systems must pass the address of the location where
+ * they store the vnode pointer. When we add the vnode into the mount
+ * list and name cache they become discoverable. So the file system node
+ * must have the connection to vnode setup by then
+ */
+ *vpp = vp;
+
+ /* Add fs named reference. */
+ if (param->vnfs_flags & VNFS_ADDFSREF) {
+ vp->v_lflag |= VNAMED_FSHASH;
+ }
+ if (param->vnfs_mp) {
+ if (param->vnfs_mp->mnt_kern_flag & MNTK_LOCK_LOCAL)
+ vp->v_flag |= VLOCKLOCAL;
+ if (insert) {
+ if ((vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb))
+ panic("insmntque: vp on the free list\n");
+
+ /*
+ * enter in mount vnode list
+ */
+ insmntque(vp, param->vnfs_mp);
+ }
+#ifndef __LP64__
+ if ((param->vnfs_mp->mnt_vtable->vfc_vfsflags & VFC_VFSTHREADSAFE) == 0) {
+ MALLOC_ZONE(vp->v_unsafefs, struct unsafe_fsnode *,
+ sizeof(struct unsafe_fsnode), M_UNSAFEFS, M_WAITOK);
+ vp->v_unsafefs->fsnode_count = 0;
+ vp->v_unsafefs->fsnodeowner = (void *)NULL;
+ lck_mtx_init(&vp->v_unsafefs->fsnodelock, vnode_lck_grp, vnode_lck_attr);
+ }
+#endif /* __LP64__ */
+ }
+ if (dvp && vnode_ref(dvp) == 0) {
+ vp->v_parent = dvp;
+ }
+ if (cnp) {
+ if (dvp && ((param->vnfs_flags & (VNFS_NOCACHE | VNFS_CANTCACHE)) == 0)) {
+ /*
+ * enter into name cache
+ * we've got the info to enter it into the name cache now
+ * cache_enter_create will pick up an extra reference on
+ * the name entered into the string cache
+ */
+ vp->v_name = cache_enter_create(dvp, vp, cnp);
+ } else
+ vp->v_name = vfs_addname(cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_hash, 0);
+
+ if ((cnp->cn_flags & UNIONCREATED) == UNIONCREATED)
+ vp->v_flag |= VISUNION;
+ }
+ if ((param->vnfs_flags & VNFS_CANTCACHE) == 0) {
+ /*
+ * this vnode is being created as cacheable in the name cache
+ * this allows us to re-enter it in the cache
+ */
+ vp->v_flag |= VNCACHEABLE;
+ }
+ ut = get_bsdthread_info(current_thread());
+
+ if ((current_proc()->p_lflag & P_LRAGE_VNODES) ||
+ (ut->uu_flag & UT_RAGE_VNODES)) {
+ /*
+ * process has indicated that it wants any
+ * vnodes created on its behalf to be rapidly
+ * aged to reduce the impact on the cached set
+ * of vnodes
+ */
+ vp->v_flag |= VRAGE;
+ }
+ return (0);
+}
+
+int
+vnode_addfsref(vnode_t vp)
+{
+ vnode_lock_spin(vp);
+ if (vp->v_lflag & VNAMED_FSHASH)
+ panic("add_fsref: vp already has named reference");
+ if ((vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb))
+ panic("addfsref: vp on the free list\n");
+ vp->v_lflag |= VNAMED_FSHASH;
+ vnode_unlock(vp);
+ return(0);
+
+}
+int
+vnode_removefsref(vnode_t vp)
+{
+ vnode_lock_spin(vp);
+ if ((vp->v_lflag & VNAMED_FSHASH) == 0)
+ panic("remove_fsref: no named reference");
+ vp->v_lflag &= ~VNAMED_FSHASH;
+ vnode_unlock(vp);
+ return(0);
+
+}
+
+
+int
+vfs_iterate(int flags, int (*callout)(mount_t, void *), void *arg)
+{
+ mount_t mp;
+ int ret = 0;
+ fsid_t * fsid_list;
+ int count, actualcount, i;
+ void * allocmem;
+ int indx_start, indx_stop, indx_incr;
+
+ count = mount_getvfscnt();
+ count += 10;
+
+ fsid_list = (fsid_t *)kalloc(count * sizeof(fsid_t));
+ allocmem = (void *)fsid_list;
+
+ actualcount = mount_fillfsids(fsid_list, count);
+
+ /*
+ * Establish the iteration direction
+ * VFS_ITERATE_TAIL_FIRST overrides default head first order (oldest first)
+ */
+ if (flags & VFS_ITERATE_TAIL_FIRST) {
+ indx_start = actualcount - 1;
+ indx_stop = -1;
+ indx_incr = -1;
+ } else /* Head first by default */ {
+ indx_start = 0;
+ indx_stop = actualcount;
+ indx_incr = 1;
+ }
+
+ for (i=indx_start; i != indx_stop; i += indx_incr) {
+
+ /* obtain the mount point with iteration reference */
+ mp = mount_list_lookupby_fsid(&fsid_list[i], 0, 1);
+
+ if(mp == (struct mount *)0)
+ continue;
+ mount_lock(mp);
+ if (mp->mnt_lflag & (MNT_LDEAD | MNT_LUNMOUNT)) {
+ mount_unlock(mp);
+ mount_iterdrop(mp);
+ continue;
+
+ }
+ mount_unlock(mp);
+
+ /* iterate over all the vnodes */
+ ret = callout(mp, arg);
+
+ mount_iterdrop(mp);
+
+ switch (ret) {
+ case VFS_RETURNED:
+ case VFS_RETURNED_DONE:
+ if (ret == VFS_RETURNED_DONE) {
+ ret = 0;
+ goto out;
+ }
+ break;
+
+ case VFS_CLAIMED_DONE:
+ ret = 0;
+ goto out;
+ case VFS_CLAIMED:
+ default:
+ break;
+ }
+ ret = 0;
+ }
+
+out:
+ kfree(allocmem, (count * sizeof(fsid_t)));
+ return (ret);
+}
+
+/*
+ * Update the vfsstatfs structure in the mountpoint.
+ * MAC: Parameter eventtype added, indicating whether the event that
+ * triggered this update came from user space, via a system call
+ * (VFS_USER_EVENT) or an internal kernel call (VFS_KERNEL_EVENT).
+ */
+int
+vfs_update_vfsstat(mount_t mp, vfs_context_t ctx, __unused int eventtype)
+{
+ struct vfs_attr va;
+ int error;
+
+ /*
+ * Request the attributes we want to propagate into
+ * the per-mount vfsstat structure.
+ */
+ VFSATTR_INIT(&va);
+ VFSATTR_WANTED(&va, f_iosize);
+ VFSATTR_WANTED(&va, f_blocks);
+ VFSATTR_WANTED(&va, f_bfree);
+ VFSATTR_WANTED(&va, f_bavail);
+ VFSATTR_WANTED(&va, f_bused);
+ VFSATTR_WANTED(&va, f_files);
+ VFSATTR_WANTED(&va, f_ffree);
+ VFSATTR_WANTED(&va, f_bsize);
+ VFSATTR_WANTED(&va, f_fssubtype);
+#if CONFIG_MACF
+ if (eventtype == VFS_USER_EVENT) {
+ error = mac_mount_check_getattr(ctx, mp, &va);
+ if (error != 0)
+ return (error);
+ }
+#endif
+
+ if ((error = vfs_getattr(mp, &va, ctx)) != 0) {
+ KAUTH_DEBUG("STAT - filesystem returned error %d", error);
+ return(error);
+ }
+
+ /*
+ * Unpack into the per-mount structure.
+ *
+ * We only overwrite these fields, which are likely to change:
+ * f_blocks
+ * f_bfree
+ * f_bavail
+ * f_bused
+ * f_files
+ * f_ffree
+ *
+ * And these which are not, but which the FS has no other way
+ * of providing to us:
+ * f_bsize
+ * f_iosize
+ * f_fssubtype
+ *
+ */
+ if (VFSATTR_IS_SUPPORTED(&va, f_bsize)) {
+ /* 4822056 - protect against malformed server mount */
+ mp->mnt_vfsstat.f_bsize = (va.f_bsize > 0 ? va.f_bsize : 512);
+ } else {
+ mp->mnt_vfsstat.f_bsize = mp->mnt_devblocksize; /* default from the device block size */
+ }
+ if (VFSATTR_IS_SUPPORTED(&va, f_iosize)) {
+ mp->mnt_vfsstat.f_iosize = va.f_iosize;
+ } else {
+ mp->mnt_vfsstat.f_iosize = 1024 * 1024; /* 1MB sensible I/O size */
+ }
+ if (VFSATTR_IS_SUPPORTED(&va, f_blocks))
+ mp->mnt_vfsstat.f_blocks = va.f_blocks;
+ if (VFSATTR_IS_SUPPORTED(&va, f_bfree))
+ mp->mnt_vfsstat.f_bfree = va.f_bfree;
+ if (VFSATTR_IS_SUPPORTED(&va, f_bavail))
+ mp->mnt_vfsstat.f_bavail = va.f_bavail;
+ if (VFSATTR_IS_SUPPORTED(&va, f_bused))
+ mp->mnt_vfsstat.f_bused = va.f_bused;
+ if (VFSATTR_IS_SUPPORTED(&va, f_files))
+ mp->mnt_vfsstat.f_files = va.f_files;
+ if (VFSATTR_IS_SUPPORTED(&va, f_ffree))
+ mp->mnt_vfsstat.f_ffree = va.f_ffree;
+
+ /* this is unlikely to change, but has to be queried for */
+ if (VFSATTR_IS_SUPPORTED(&va, f_fssubtype))
+ mp->mnt_vfsstat.f_fssubtype = va.f_fssubtype;
+
+ return(0);
+}
+
+int
+mount_list_add(mount_t mp)
+{
+ int res;
+
+ mount_list_lock();
+ if (system_inshutdown != 0) {
+ res = -1;
+ } else {
+ TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
+ nummounts++;
+ res = 0;
+ }
+ mount_list_unlock();
+
+ return res;
+}
+
+void
+mount_list_remove(mount_t mp)
+{
+ mount_list_lock();
+ TAILQ_REMOVE(&mountlist, mp, mnt_list);
+ nummounts--;
+ mp->mnt_list.tqe_next = NULL;
+ mp->mnt_list.tqe_prev = NULL;
+ mount_list_unlock();
+}
+
+mount_t
+mount_lookupby_volfsid(int volfs_id, int withref)
+{
+ mount_t cur_mount = (mount_t)0;
+ mount_t mp;
+
+ mount_list_lock();
+ TAILQ_FOREACH(mp, &mountlist, mnt_list) {
+ if (!(mp->mnt_kern_flag & MNTK_UNMOUNT) &&
+ (mp->mnt_kern_flag & MNTK_PATH_FROM_ID) &&
+ (mp->mnt_vfsstat.f_fsid.val[0] == volfs_id)) {
+ cur_mount = mp;
+ if (withref) {
+ if (mount_iterref(cur_mount, 1)) {
+ cur_mount = (mount_t)0;
+ mount_list_unlock();
+ goto out;
+ }
+ }
+ break;
+ }
+ }
+ mount_list_unlock();
+ if (withref && (cur_mount != (mount_t)0)) {
+ mp = cur_mount;
+ if (vfs_busy(mp, LK_NOWAIT) != 0) {
+ cur_mount = (mount_t)0;
+ }
+ mount_iterdrop(mp);
+ }
+out:
+ return(cur_mount);
+}
+
+mount_t
+mount_list_lookupby_fsid(fsid_t *fsid, int locked, int withref)
+{
+ mount_t retmp = (mount_t)0;
+ mount_t mp;
+
+ if (!locked)
+ mount_list_lock();
+ TAILQ_FOREACH(mp, &mountlist, mnt_list)
+ if (mp->mnt_vfsstat.f_fsid.val[0] == fsid->val[0] &&
+ mp->mnt_vfsstat.f_fsid.val[1] == fsid->val[1]) {
+ retmp = mp;
+ if (withref) {
+ if (mount_iterref(retmp, 1))
+ retmp = (mount_t)0;
+ }
+ goto out;
+ }
+out:
+ if (!locked)
+ mount_list_unlock();
+ return (retmp);
+}
+
+errno_t
+vnode_lookup(const char *path, int flags, vnode_t *vpp, vfs_context_t ctx)
+{
+ struct nameidata nd;
+ int error;
+ u_int32_t ndflags = 0;
+
+ if (ctx == NULL) { /* XXX technically an error */
+ ctx = vfs_context_current();
+ }
+
+ if (flags & VNODE_LOOKUP_NOFOLLOW)
+ ndflags = NOFOLLOW;
+ else
+ ndflags = FOLLOW;
+
+ if (flags & VNODE_LOOKUP_NOCROSSMOUNT)
+ ndflags |= NOCROSSMOUNT;
+ if (flags & VNODE_LOOKUP_DOWHITEOUT)
+ ndflags |= DOWHITEOUT;
+
+ /* XXX AUDITVNPATH1 needed ? */
+ NDINIT(&nd, LOOKUP, OP_LOOKUP, ndflags, UIO_SYSSPACE,
+ CAST_USER_ADDR_T(path), ctx);
+
+ if ((error = namei(&nd)))
+ return (error);
+ *vpp = nd.ni_vp;
+ nameidone(&nd);
+
+ return (0);
+}
+
+errno_t
+vnode_open(const char *path, int fmode, int cmode, int flags, vnode_t *vpp, vfs_context_t ctx)
+{
+ struct nameidata nd;
+ int error;
+ u_int32_t ndflags = 0;
+ int lflags = flags;
+
+ if (ctx == NULL) { /* XXX technically an error */
+ ctx = vfs_context_current();
+ }
+
+ if (fmode & O_NOFOLLOW)
+ lflags |= VNODE_LOOKUP_NOFOLLOW;
+
+ if (lflags & VNODE_LOOKUP_NOFOLLOW)
+ ndflags = NOFOLLOW;
+ else
+ ndflags = FOLLOW;
+
+ if (lflags & VNODE_LOOKUP_NOCROSSMOUNT)
+ ndflags |= NOCROSSMOUNT;
+ if (lflags & VNODE_LOOKUP_DOWHITEOUT)
+ ndflags |= DOWHITEOUT;
+
+ /* XXX AUDITVNPATH1 needed ? */
+ NDINIT(&nd, LOOKUP, OP_OPEN, ndflags, UIO_SYSSPACE,
+ CAST_USER_ADDR_T(path), ctx);
+
+ if ((error = vn_open(&nd, fmode, cmode)))
+ *vpp = NULL;
+ else
+ *vpp = nd.ni_vp;
+
+ return (error);
+}
+
+errno_t
+vnode_close(vnode_t vp, int flags, vfs_context_t ctx)
+{
+ int error;
+
+ if (ctx == NULL) {
+ ctx = vfs_context_current();
+ }
+
+ error = vn_close(vp, flags, ctx);
+ vnode_put(vp);
+ return (error);
+}
+
+/*
+ * Returns: 0 Success
+ * vnode_getattr:???
+ */
+errno_t
+vnode_size(vnode_t vp, off_t *sizep, vfs_context_t ctx)
+{
+ struct vnode_attr va;
+ int error;
+
+ VATTR_INIT(&va);
+ VATTR_WANTED(&va, va_data_size);
+ error = vnode_getattr(vp, &va, ctx);
+ if (!error)
+ *sizep = va.va_data_size;
+ return(error);
+}
+
+errno_t
+vnode_setsize(vnode_t vp, off_t size, int ioflag, vfs_context_t ctx)
+{
+ struct vnode_attr va;
+
+ VATTR_INIT(&va);
+ VATTR_SET(&va, va_data_size, size);
+ va.va_vaflags = ioflag & 0xffff;
+ return(vnode_setattr(vp, &va, ctx));
+}
+
+static int
+vn_create_reg(vnode_t dvp, vnode_t *vpp, struct nameidata *ndp, struct vnode_attr *vap, uint32_t flags, int fmode, uint32_t *statusp, vfs_context_t ctx)
+{
+ /* Only use compound VNOP for compound operation */
+ if (vnode_compound_open_available(dvp) && ((flags & VN_CREATE_DOOPEN) != 0)) {
+ *vpp = NULLVP;
+ return VNOP_COMPOUND_OPEN(dvp, vpp, ndp, VNOP_COMPOUND_OPEN_DO_CREATE, fmode, statusp, vap, ctx);
+ } else {
+ return VNOP_CREATE(dvp, vpp, &ndp->ni_cnd, vap, ctx);
+ }
+}
+
+/*
+ * Create a filesystem object of arbitrary type with arbitrary attributes in
+ * the spevied directory with the specified name.
+ *
+ * Parameters: dvp Pointer to the vnode of the directory
+ * in which to create the object.
+ * vpp Pointer to the area into which to
+ * return the vnode of the created object.
+ * cnp Component name pointer from the namei
+ * data structure, containing the name to
+ * use for the create object.
+ * vap Pointer to the vnode_attr structure
+ * describing the object to be created,
+ * including the type of object.
+ * flags VN_* flags controlling ACL inheritance
+ * and whether or not authorization is to
+ * be required for the operation.
+ *
+ * Returns: 0 Success
+ * !0 errno value
+ *
+ * Implicit: *vpp Contains the vnode of the object that
+ * was created, if successful.
+ * *cnp May be modified by the underlying VFS.
+ * *vap May be modified by the underlying VFS.
+ * modified by either ACL inheritance or
+ *
+ *
+ * be modified, even if the operation is
+ *
+ *
+ * Notes: The kauth_filesec_t in 'vap', if any, is in host byte order.
+ *
+ * Modification of '*cnp' and '*vap' by the underlying VFS is
+ * strongly discouraged.
+ *
+ * XXX: This function is a 'vn_*' function; it belongs in vfs_vnops.c
+ *
+ * XXX: We should enummerate the possible errno values here, and where
+ * in the code they originated.
+ */
+errno_t
+vn_create(vnode_t dvp, vnode_t *vpp, struct nameidata *ndp, struct vnode_attr *vap, uint32_t flags, int fmode, uint32_t *statusp, vfs_context_t ctx)
+{
+ errno_t error, old_error;
+ vnode_t vp = (vnode_t)0;
+ boolean_t batched;
+ struct componentname *cnp;
+ uint32_t defaulted;
+
+ cnp = &ndp->ni_cnd;
+ error = 0;
+ batched = namei_compound_available(dvp, ndp) ? TRUE : FALSE;
+
+ KAUTH_DEBUG("%p CREATE - '%s'", dvp, cnp->cn_nameptr);
+
+ if (flags & VN_CREATE_NOINHERIT)
+ vap->va_vaflags |= VA_NOINHERIT;
+ if (flags & VN_CREATE_NOAUTH)
+ vap->va_vaflags |= VA_NOAUTH;
+ /*
+ * Handle ACL inheritance, initialize vap.
+ */
+ error = vn_attribute_prepare(dvp, vap, &defaulted, ctx);
+ if (error) {
+ return error;
+ }
+
+ if (vap->va_type != VREG && (fmode != 0 || (flags & VN_CREATE_DOOPEN) || statusp)) {
+ panic("Open parameters, but not a regular file.");
+ }
+ if ((fmode != 0) && ((flags & VN_CREATE_DOOPEN) == 0)) {
+ panic("Mode for open, but not trying to open...");
+ }
+
+ /*
+ * Create the requested node.
+ */
+ switch(vap->va_type) {
+ case VREG:
+ error = vn_create_reg(dvp, vpp, ndp, vap, flags, fmode, statusp, ctx);
+ break;
+ case VDIR:
+ error = vn_mkdir(dvp, vpp, ndp, vap, ctx);
+ break;
+ case VSOCK:
+ case VFIFO:
+ case VBLK:
+ case VCHR:
+ error = VNOP_MKNOD(dvp, vpp, cnp, vap, ctx);
+ break;
+ default:
+ panic("vnode_create: unknown vtype %d", vap->va_type);
+ }
+ if (error != 0) {
+ KAUTH_DEBUG("%p CREATE - error %d returned by filesystem", dvp, error);
+ goto out;
+ }
+
+ vp = *vpp;
+ old_error = error;
+
+#if CONFIG_MACF
+ if (!(flags & VN_CREATE_NOLABEL)) {
+ error = vnode_label(vnode_mount(vp), dvp, vp, cnp, VNODE_LABEL_CREATE, ctx);
+ if (error)
+ goto error;
+ }
+#endif
+
+ /*
+ * If some of the requested attributes weren't handled by the VNOP,
+ * use our fallback code.
+ */
+ if (!VATTR_ALL_SUPPORTED(vap) && *vpp) {
+ KAUTH_DEBUG(" CREATE - doing fallback with ACL %p", vap->va_acl);
+ error = vnode_setattr_fallback(*vpp, vap, ctx);
+ }
+#if CONFIG_MACF
+error:
+#endif
+ if ((error != 0) && (vp != (vnode_t)0)) {
+
+ /* If we've done a compound open, close */
+ if (batched && (old_error == 0) && (vap->va_type == VREG)) {
+ VNOP_CLOSE(vp, fmode, ctx);
+ }
+
+ /* Need to provide notifications if a create succeeded */
+ if (!batched) {
+ *vpp = (vnode_t) 0;
+ vnode_put(vp);
+ }
+ }
+
+out:
+ vn_attribute_cleanup(vap, defaulted);
+
+ return(error);
+}
+
+static kauth_scope_t vnode_scope;
+static int vnode_authorize_callback(kauth_cred_t credential, void *idata, kauth_action_t action,
+ uintptr_t arg0, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3);
+static int vnode_authorize_callback_int(__unused kauth_cred_t credential, __unused void *idata, kauth_action_t action,
+ uintptr_t arg0, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3);
+
+typedef struct _vnode_authorize_context {
+ vnode_t vp;
+ struct vnode_attr *vap;
+ vnode_t dvp;
+ struct vnode_attr *dvap;
+ vfs_context_t ctx;
+ int flags;
+ int flags_valid;
+#define _VAC_IS_OWNER (1<<0)
+#define _VAC_IN_GROUP (1<<1)
+#define _VAC_IS_DIR_OWNER (1<<2)
+#define _VAC_IN_DIR_GROUP (1<<3)
+} *vauth_ctx;
+
+void
+vnode_authorize_init(void)
+{
+ vnode_scope = kauth_register_scope(KAUTH_SCOPE_VNODE, vnode_authorize_callback, NULL);
+}
+
+#define VATTR_PREPARE_DEFAULTED_UID 0x1
+#define VATTR_PREPARE_DEFAULTED_GID 0x2
+#define VATTR_PREPARE_DEFAULTED_MODE 0x4
+
+int
+vn_attribute_prepare(vnode_t dvp, struct vnode_attr *vap, uint32_t *defaulted_fieldsp, vfs_context_t ctx)
+{
+ kauth_acl_t nacl = NULL, oacl = NULL;
+ int error;
+
+ /*
+ * Handle ACL inheritance.
+ */
+ if (!(vap->va_vaflags & VA_NOINHERIT) && vfs_extendedsecurity(dvp->v_mount)) {
+ /* save the original filesec */
+ if (VATTR_IS_ACTIVE(vap, va_acl)) {
+ oacl = vap->va_acl;
+ }
+
+ vap->va_acl = NULL;
+ if ((error = kauth_acl_inherit(dvp,
+ oacl,
+ &nacl,
+ vap->va_type == VDIR,
+ ctx)) != 0) {
+ KAUTH_DEBUG("%p CREATE - error %d processing inheritance", dvp, error);
+ return(error);
+ }
+
+ /*
+ * If the generated ACL is NULL, then we can save ourselves some effort
+ * by clearing the active bit.
+ */
+ if (nacl == NULL) {
+ VATTR_CLEAR_ACTIVE(vap, va_acl);
+ } else {
+ vap->va_base_acl = oacl;
+ VATTR_SET(vap, va_acl, nacl);
+ }
+ }
+
+ error = vnode_authattr_new_internal(dvp, vap, (vap->va_vaflags & VA_NOAUTH), defaulted_fieldsp, ctx);
+ if (error) {
+ vn_attribute_cleanup(vap, *defaulted_fieldsp);
+ }
+
+ return error;
+}
+
+void
+vn_attribute_cleanup(struct vnode_attr *vap, uint32_t defaulted_fields)
+{
+ /*
+ * If the caller supplied a filesec in vap, it has been replaced
+ * now by the post-inheritance copy. We need to put the original back
+ * and free the inherited product.
+ */
+ kauth_acl_t nacl, oacl;
+
+ if (VATTR_IS_ACTIVE(vap, va_acl)) {
+ nacl = vap->va_acl;
+ oacl = vap->va_base_acl;
+
+ if (oacl) {
+ VATTR_SET(vap, va_acl, oacl);
+ vap->va_base_acl = NULL;
+ } else {
+ VATTR_CLEAR_ACTIVE(vap, va_acl);
+ }
+
+ if (nacl != NULL) {
+ kauth_acl_free(nacl);
+ }
+ }
+
+ if ((defaulted_fields & VATTR_PREPARE_DEFAULTED_MODE) != 0) {
+ VATTR_CLEAR_ACTIVE(vap, va_mode);
+ }
+ if ((defaulted_fields & VATTR_PREPARE_DEFAULTED_GID) != 0) {
+ VATTR_CLEAR_ACTIVE(vap, va_gid);
+ }
+ if ((defaulted_fields & VATTR_PREPARE_DEFAULTED_UID) != 0) {
+ VATTR_CLEAR_ACTIVE(vap, va_uid);
+ }
+
+ return;
+}
+
+int
+vn_authorize_unlink(vnode_t dvp, vnode_t vp, struct componentname *cnp, vfs_context_t ctx, __unused void *reserved)
+{
+ int error = 0;
+
+ /*
+ * Normally, unlinking of directories is not supported.
+ * However, some file systems may have limited support.
+ */
+ if ((vp->v_type == VDIR) &&
+ !(vp->v_mount->mnt_vtable->vfc_vfsflags & VFC_VFSDIRLINKS)) {
+ return (EPERM); /* POSIX */
+ }
+
+ /* authorize the delete operation */
+#if CONFIG_MACF
+ if (!error)
+ error = mac_vnode_check_unlink(ctx, dvp, vp, cnp);
+#endif /* MAC */
+ if (!error)
+ error = vnode_authorize(vp, dvp, KAUTH_VNODE_DELETE, ctx);
+
+ return error;
+}
+
+int
+vn_authorize_open_existing(vnode_t vp, struct componentname *cnp, int fmode, vfs_context_t ctx, void *reserved)
+{
+ /* Open of existing case */
+ kauth_action_t action;
+ int error = 0;
+
+ if (cnp->cn_ndp == NULL) {
+ panic("NULL ndp");
+ }
+ if (reserved != NULL) {
+ panic("reserved not NULL.");
+ }
+
+#if CONFIG_MACF
+ /* XXX may do duplicate work here, but ignore that for now (idempotent) */
+ if (vfs_flags(vnode_mount(vp)) & MNT_MULTILABEL) {
+ error = vnode_label(vnode_mount(vp), NULL, vp, NULL, 0, ctx);
+ if (error)
+ return (error);
+ }
+#endif
+
+ if ( (fmode & O_DIRECTORY) && vp->v_type != VDIR ) {
+ return (ENOTDIR);
+ }
+
+ if (vp->v_type == VSOCK && vp->v_tag != VT_FDESC) {
+ return (EOPNOTSUPP); /* Operation not supported on socket */
+ }
+
+ if (vp->v_type == VLNK && (fmode & O_NOFOLLOW) != 0) {
+ return (ELOOP); /* O_NOFOLLOW was specified and the target is a symbolic link */
+ }
+
+ /* disallow write operations on directories */
+ if (vnode_isdir(vp) && (fmode & (FWRITE | O_TRUNC))) {
+ return (EISDIR);
+ }
+
+ if ((cnp->cn_ndp->ni_flag & NAMEI_TRAILINGSLASH)) {
+ if (vp->v_type != VDIR) {
+ return (ENOTDIR);
+ }
+ }
+
+#if CONFIG_MACF
+ /* If a file being opened is a shadow file containing
+ * namedstream data, ignore the macf checks because it
+ * is a kernel internal file and access should always
+ * be allowed.
+ */
+ if (!(vnode_isshadow(vp) && vnode_isnamedstream(vp))) {
+ error = mac_vnode_check_open(ctx, vp, fmode);
+ if (error) {
+ return (error);
+ }
+ }
+#endif
+
+ /* compute action to be authorized */
+ action = 0;
+ if (fmode & FREAD) {
+ action |= KAUTH_VNODE_READ_DATA;
+ }
+ if (fmode & (FWRITE | O_TRUNC)) {
+ /*
+ * If we are writing, appending, and not truncating,
+ * indicate that we are appending so that if the
+ * UF_APPEND or SF_APPEND bits are set, we do not deny
+ * the open.
+ */
+ if ((fmode & O_APPEND) && !(fmode & O_TRUNC)) {
+ action |= KAUTH_VNODE_APPEND_DATA;
+ } else {
+ action |= KAUTH_VNODE_WRITE_DATA;
+ }
+ }
+ return (vnode_authorize(vp, NULL, action, ctx));
+}
+
+int
+vn_authorize_create(vnode_t dvp, struct componentname *cnp, struct vnode_attr *vap, vfs_context_t ctx, void *reserved)
+{
+ /* Creation case */
+ int error;
+
+ if (cnp->cn_ndp == NULL) {
+ panic("NULL cn_ndp");
+ }
+ if (reserved != NULL) {
+ panic("reserved not NULL.");
+ }
+
+ /* Only validate path for creation if we didn't do a complete lookup */
+ if (cnp->cn_ndp->ni_flag & NAMEI_UNFINISHED) {
+ error = lookup_validate_creation_path(cnp->cn_ndp);
+ if (error)
+ return (error);
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_create(ctx, dvp, cnp, vap);
+ if (error)
+ return (error);
+#endif /* CONFIG_MACF */
+
+ return (vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_FILE, ctx));
+}
+
+int
+vn_authorize_rename(struct vnode *fdvp, struct vnode *fvp, struct componentname *fcnp,
+ struct vnode *tdvp, struct vnode *tvp, struct componentname *tcnp,
+ vfs_context_t ctx, void *reserved)
+{
+ int error = 0;
+ int moving = 0;
+
+ if (reserved != NULL) {
+ panic("Passed something other than NULL as reserved field!");
+ }
+
+ /*
+ * Avoid renaming "." and "..".
+ *
+ * XXX No need to check for this in the FS. We should always have the leaves
+ * in VFS in this case.
+ */
+ if (fvp->v_type == VDIR &&
+ ((fdvp == fvp) ||
+ (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
+ ((fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT)) ) {
+ error = EINVAL;
+ goto out;
+ }
+
+ if (tvp == NULLVP && vnode_compound_rename_available(tdvp)) {
+ error = lookup_validate_creation_path(tcnp->cn_ndp);
+ if (error)
+ goto out;
+ }
+
+ /***** <MACF> *****/
+#if CONFIG_MACF
+ error = mac_vnode_check_rename_from(ctx, fdvp, fvp, fcnp);
+ if (error)
+ goto out;
+#endif
+
+#if CONFIG_MACF
+ error = mac_vnode_check_rename_to(ctx,
+ tdvp, tvp, fdvp == tdvp, tcnp);
+ if (error)
+ goto out;
+#endif
+ /***** </MACF> *****/
+
+ /***** <MiscChecks> *****/
+ if (tvp != NULL) {
+ if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
+ error = ENOTDIR;
+ goto out;
+ } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
+ error = EISDIR;
+ goto out;
+ }
+ }
+
+ if (fvp == tdvp) {
+ error = EINVAL;
+ goto out;
+ }
+
+ /*
+ * The following edge case is caught here:
+ * (to cannot be a descendent of from)
+ *
+ * o fdvp
+ * /
+ * /
+ * o fvp
+ * \
+ * \
+ * o tdvp
+ * /
+ * /
+ * o tvp
+ */
+ if (tdvp->v_parent == fvp) {
+ error = EINVAL;
+ goto out;
+ }
+ /***** </MiscChecks> *****/
+
+ /***** <Kauth> *****/
+
+ error = 0;
+ if ((tvp != NULL) && vnode_isdir(tvp)) {
+ if (tvp != fdvp)
+ moving = 1;
+ } else if (tdvp != fdvp) {
+ moving = 1;
+ }
+
+
+ /*
+ * must have delete rights to remove the old name even in
+ * the simple case of fdvp == tdvp.
+ *
+ * If fvp is a directory, and we are changing it's parent,
+ * then we also need rights to rewrite its ".." entry as well.
+ */
+ if (vnode_isdir(fvp)) {
+ if ((error = vnode_authorize(fvp, fdvp, KAUTH_VNODE_DELETE | KAUTH_VNODE_ADD_SUBDIRECTORY, ctx)) != 0)
+ goto out;
+ } else {
+ if ((error = vnode_authorize(fvp, fdvp, KAUTH_VNODE_DELETE, ctx)) != 0)
+ goto out;
+ }
+ if (moving) {
+ /* moving into tdvp or tvp, must have rights to add */
+ if ((error = vnode_authorize(((tvp != NULL) && vnode_isdir(tvp)) ? tvp : tdvp,
+ NULL,
+ vnode_isdir(fvp) ? KAUTH_VNODE_ADD_SUBDIRECTORY : KAUTH_VNODE_ADD_FILE,
+ ctx)) != 0) {
+ goto out;
+ }
+ } else {
+ /* node staying in same directory, must be allowed to add new name */
+ if ((error = vnode_authorize(fdvp, NULL,
+ vnode_isdir(fvp) ? KAUTH_VNODE_ADD_SUBDIRECTORY : KAUTH_VNODE_ADD_FILE, ctx)) != 0)
+ goto out;
+ }
+ /* overwriting tvp */
+ if ((tvp != NULL) && !vnode_isdir(tvp) &&
+ ((error = vnode_authorize(tvp, tdvp, KAUTH_VNODE_DELETE, ctx)) != 0)) {
+ goto out;
+ }
+
+ /***** </Kauth> *****/
+
+ /* XXX more checks? */
+out:
+ return error;
+}
+
+int
+vn_authorize_mkdir(vnode_t dvp, struct componentname *cnp, struct vnode_attr *vap, vfs_context_t ctx, void *reserved)
+{
+ int error;
+
+ if (reserved != NULL) {
+ panic("reserved not NULL in vn_authorize_mkdir()");
+ }
+
+ /* XXX A hack for now, to make shadow files work */
+ if (cnp->cn_ndp == NULL) {
+ return 0;
+ }
+
+ if (vnode_compound_mkdir_available(dvp)) {
+ error = lookup_validate_creation_path(cnp->cn_ndp);
+ if (error)
+ goto out;
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_create(ctx,
+ dvp, cnp, vap);
+ if (error)
+ goto out;
+#endif
+
+ /* authorize addition of a directory to the parent */
+ if ((error = vnode_authorize(dvp, NULL, KAUTH_VNODE_ADD_SUBDIRECTORY, ctx)) != 0)
+ goto out;
+
+out:
+ return error;
+}
+
+int
+vn_authorize_rmdir(vnode_t dvp, vnode_t vp, struct componentname *cnp, vfs_context_t ctx, void *reserved)
+{
+ int error;
+
+ if (reserved != NULL) {
+ panic("Non-NULL reserved argument to vn_authorize_rmdir()");
+ }
+
+ if (vp->v_type != VDIR) {
+ /*
+ * rmdir only deals with directories
+ */
+ return ENOTDIR;
+ }
+
+ if (dvp == vp) {
+ /*
+ * No rmdir "." please.
+ */
+ return EINVAL;
+ }
+
+#if CONFIG_MACF
+ error = mac_vnode_check_unlink(ctx, dvp,
+ vp, cnp);
+ if (error)
+ return error;
+#endif
+
+ return vnode_authorize(vp, dvp, KAUTH_VNODE_DELETE, ctx);
+}
+
+/*
+ * Authorize an operation on a vnode.
+ *
+ * This is KPI, but here because it needs vnode_scope.
+ *
+ * Returns: 0 Success
+ * kauth_authorize_action:EPERM ...
+ * xlate => EACCES Permission denied
+ * kauth_authorize_action:0 Success
+ * kauth_authorize_action: Depends on callback return; this is
+ * usually only vnode_authorize_callback(),
+ * but may include other listerners, if any
+ * exist.
+ * EROFS
+ * EACCES
+ * EPERM
+ * ???
+ */
+int
+vnode_authorize(vnode_t vp, vnode_t dvp, kauth_action_t action, vfs_context_t ctx)
+{
+ int error, result;
+
+ /*
+ * We can't authorize against a dead vnode; allow all operations through so that
+ * the correct error can be returned.
+ */
+ if (vp->v_type == VBAD)
+ return(0);
+
+ error = 0;
+ result = kauth_authorize_action(vnode_scope, vfs_context_ucred(ctx), action,
+ (uintptr_t)ctx, (uintptr_t)vp, (uintptr_t)dvp, (uintptr_t)&error);
+ if (result == EPERM) /* traditional behaviour */
+ result = EACCES;
+ /* did the lower layers give a better error return? */
+ if ((result != 0) && (error != 0))
+ return(error);
+ return(result);
+}
+
+/*
+ * Test for vnode immutability.
+ *
+ * The 'append' flag is set when the authorization request is constrained
+ * to operations which only request the right to append to a file.
+ *
+ * The 'ignore' flag is set when an operation modifying the immutability flags
+ * is being authorized. We check the system securelevel to determine which
+ * immutability flags we can ignore.
+ */
+static int
+vnode_immutable(struct vnode_attr *vap, int append, int ignore)
+{
+ int mask;
+
+ /* start with all bits precluding the operation */
+ mask = IMMUTABLE | APPEND;
+
+ /* if appending only, remove the append-only bits */
+ if (append)
+ mask &= ~APPEND;
+
+ /* ignore only set when authorizing flags changes */
+ if (ignore) {
+ if (securelevel <= 0) {
+ /* in insecure state, flags do not inhibit changes */
+ mask = 0;
+ } else {
+ /* in secure state, user flags don't inhibit */
+ mask &= ~(UF_IMMUTABLE | UF_APPEND);
+ }
+ }
+ KAUTH_DEBUG("IMMUTABLE - file flags 0x%x mask 0x%x append = %d ignore = %d", vap->va_flags, mask, append, ignore);
+ if ((vap->va_flags & mask) != 0)
+ return(EPERM);
+ return(0);
+}
+
+static int
+vauth_node_owner(struct vnode_attr *vap, kauth_cred_t cred)
+{
+ int result;
+
+ /* default assumption is not-owner */
+ result = 0;
+
+ /*
+ * If the filesystem has given us a UID, we treat this as authoritative.
+ */
+ if (vap && VATTR_IS_SUPPORTED(vap, va_uid)) {
+ result = (vap->va_uid == kauth_cred_getuid(cred)) ? 1 : 0;
+ }
+ /* we could test the owner UUID here if we had a policy for it */
+
+ return(result);
+}
+
+/*
+ * vauth_node_group
+ *
+ * Description: Ask if a cred is a member of the group owning the vnode object
+ *
+ * Parameters: vap vnode attribute
+ * vap->va_gid group owner of vnode object
+ * cred credential to check
+ * ismember pointer to where to put the answer
+ * idontknow Return this if we can't get an answer
+ *
+ * Returns: 0 Success
+ * idontknow Can't get information
+ * kauth_cred_ismember_gid:? Error from kauth subsystem
+ * kauth_cred_ismember_gid:? Error from kauth subsystem
+ */
+static int
+vauth_node_group(struct vnode_attr *vap, kauth_cred_t cred, int *ismember, int idontknow)
+{
+ int error;
+ int result;
+
+ error = 0;
+ result = 0;
+
+ /*
+ * The caller is expected to have asked the filesystem for a group
+ * at some point prior to calling this function. The answer may
+ * have been that there is no group ownership supported for the
+ * vnode object, in which case we return
+ */
+ if (vap && VATTR_IS_SUPPORTED(vap, va_gid)) {
+ error = kauth_cred_ismember_gid(cred, vap->va_gid, &result);
+ /*
+ * Credentials which are opted into external group membership
+ * resolution which are not known to the external resolver
+ * will result in an ENOENT error. We translate this into
+ * the appropriate 'idontknow' response for our caller.
+ *
+ * XXX We do not make a distinction here between an ENOENT
+ * XXX arising from a response from the external resolver,
+ * XXX and an ENOENT which is internally generated. This is
+ * XXX a deficiency of the published kauth_cred_ismember_gid()
+ * XXX KPI which can not be overcome without new KPI. For
+ * XXX all currently known cases, however, this wil result
+ * XXX in correct behaviour.
+ */
+ if (error == ENOENT)
+ error = idontknow;
+ }
+ /*
+ * XXX We could test the group UUID here if we had a policy for it,
+ * XXX but this is problematic from the perspective of synchronizing
+ * XXX group UUID and POSIX GID ownership of a file and keeping the
+ * XXX values coherent over time. The problem is that the local
+ * XXX system will vend transient group UUIDs for unknown POSIX GID
+ * XXX values, and these are not persistent, whereas storage of values
+ * XXX is persistent. One potential solution to this is a local
+ * XXX (persistent) replica of remote directory entries and vended
+ * XXX local ids in a local directory server (think in terms of a
+ * XXX caching DNS server).
+ */
+
+ if (!error)
+ *ismember = result;
+ return(error);
+}
+
+static int
+vauth_file_owner(vauth_ctx vcp)
+{
+ int result;
+
+ if (vcp->flags_valid & _VAC_IS_OWNER) {
+ result = (vcp->flags & _VAC_IS_OWNER) ? 1 : 0;
+ } else {
+ result = vauth_node_owner(vcp->vap, vcp->ctx->vc_ucred);
+
+ /* cache our result */
+ vcp->flags_valid |= _VAC_IS_OWNER;
+ if (result) {
+ vcp->flags |= _VAC_IS_OWNER;
+ } else {
+ vcp->flags &= ~_VAC_IS_OWNER;
+ }
+ }
+ return(result);
+}
+
+
+/*
+ * vauth_file_ingroup
+ *
+ * Description: Ask if a user is a member of the group owning the directory
+ *
+ * Parameters: vcp The vnode authorization context that
+ * contains the user and directory info
+ * vcp->flags_valid Valid flags
+ * vcp->flags Flags values
+ * vcp->vap File vnode attributes
+ * vcp->ctx VFS Context (for user)
+ * ismember pointer to where to put the answer
+ * idontknow Return this if we can't get an answer
+ *
+ * Returns: 0 Success
+ * vauth_node_group:? Error from vauth_node_group()
+ *
+ * Implicit returns: *ismember 0 The user is not a group member
+ * 1 The user is a group member
+ */
+static int
+vauth_file_ingroup(vauth_ctx vcp, int *ismember, int idontknow)
+{
+ int error;
+
+ /* Check for a cached answer first, to avoid the check if possible */
+ if (vcp->flags_valid & _VAC_IN_GROUP) {
+ *ismember = (vcp->flags & _VAC_IN_GROUP) ? 1 : 0;
+ error = 0;
+ } else {
+ /* Otherwise, go look for it */
+ error = vauth_node_group(vcp->vap, vcp->ctx->vc_ucred, ismember, idontknow);
+
+ if (!error) {
+ /* cache our result */
+ vcp->flags_valid |= _VAC_IN_GROUP;
+ if (*ismember) {
+ vcp->flags |= _VAC_IN_GROUP;
+ } else {
+ vcp->flags &= ~_VAC_IN_GROUP;
+ }
+ }
+
+ }
+ return(error);
+}
+
+static int
+vauth_dir_owner(vauth_ctx vcp)
+{
+ int result;
+
+ if (vcp->flags_valid & _VAC_IS_DIR_OWNER) {
+ result = (vcp->flags & _VAC_IS_DIR_OWNER) ? 1 : 0;
+ } else {
+ result = vauth_node_owner(vcp->dvap, vcp->ctx->vc_ucred);
+
+ /* cache our result */
+ vcp->flags_valid |= _VAC_IS_DIR_OWNER;
+ if (result) {
+ vcp->flags |= _VAC_IS_DIR_OWNER;
+ } else {
+ vcp->flags &= ~_VAC_IS_DIR_OWNER;
+ }
+ }
+ return(result);
+}
+
+/*
+ * vauth_dir_ingroup
+ *
+ * Description: Ask if a user is a member of the group owning the directory
+ *
+ * Parameters: vcp The vnode authorization context that
+ * contains the user and directory info
+ * vcp->flags_valid Valid flags
+ * vcp->flags Flags values
+ * vcp->dvap Dir vnode attributes
+ * vcp->ctx VFS Context (for user)
+ * ismember pointer to where to put the answer
+ * idontknow Return this if we can't get an answer
+ *
+ * Returns: 0 Success
+ * vauth_node_group:? Error from vauth_node_group()
+ *
+ * Implicit returns: *ismember 0 The user is not a group member
+ * 1 The user is a group member
+ */
+static int
+vauth_dir_ingroup(vauth_ctx vcp, int *ismember, int idontknow)
+{
+ int error;
+
+ /* Check for a cached answer first, to avoid the check if possible */
+ if (vcp->flags_valid & _VAC_IN_DIR_GROUP) {
+ *ismember = (vcp->flags & _VAC_IN_DIR_GROUP) ? 1 : 0;
+ error = 0;
+ } else {
+ /* Otherwise, go look for it */
+ error = vauth_node_group(vcp->dvap, vcp->ctx->vc_ucred, ismember, idontknow);
+
+ if (!error) {
+ /* cache our result */
+ vcp->flags_valid |= _VAC_IN_DIR_GROUP;
+ if (*ismember) {
+ vcp->flags |= _VAC_IN_DIR_GROUP;
+ } else {
+ vcp->flags &= ~_VAC_IN_DIR_GROUP;
+ }
+ }
+ }
+ return(error);
+}
+
+/*
+ * Test the posix permissions in (vap) to determine whether (credential)
+ * may perform (action)
+ */
+static int
+vnode_authorize_posix(vauth_ctx vcp, int action, int on_dir)
+{
+ struct vnode_attr *vap;
+ int needed, error, owner_ok, group_ok, world_ok, ismember;
+#ifdef KAUTH_DEBUG_ENABLE
+ const char *where = "uninitialized";
+# define _SETWHERE(c) where = c;
+#else
+# define _SETWHERE(c)
+#endif
+
+ /* checking file or directory? */
+ if (on_dir) {
+ vap = vcp->dvap;
+ } else {
+ vap = vcp->vap;
+ }
+
+ error = 0;
+
+ /*
+ * We want to do as little work here as possible. So first we check
+ * which sets of permissions grant us the access we need, and avoid checking
+ * whether specific permissions grant access when more generic ones would.
+ */
+
+ /* owner permissions */
+ needed = 0;
+ if (action & VREAD)
+ needed |= S_IRUSR;
+ if (action & VWRITE)
+ needed |= S_IWUSR;
+ if (action & VEXEC)
+ needed |= S_IXUSR;
+ owner_ok = (needed & vap->va_mode) == needed;
+
+ /* group permissions */
+ needed = 0;
+ if (action & VREAD)
+ needed |= S_IRGRP;
+ if (action & VWRITE)
+ needed |= S_IWGRP;
+ if (action & VEXEC)
+ needed |= S_IXGRP;
+ group_ok = (needed & vap->va_mode) == needed;
+
+ /* world permissions */
+ needed = 0;
+ if (action & VREAD)
+ needed |= S_IROTH;
+ if (action & VWRITE)
+ needed |= S_IWOTH;
+ if (action & VEXEC)
+ needed |= S_IXOTH;
+ world_ok = (needed & vap->va_mode) == needed;
+
+ /* If granted/denied by all three, we're done */
+ if (owner_ok && group_ok && world_ok) {
+ _SETWHERE("all");
+ goto out;
+ }
+ if (!owner_ok && !group_ok && !world_ok) {
+ _SETWHERE("all");
+ error = EACCES;
+ goto out;
+ }
+
+ /* Check ownership (relatively cheap) */
+ if ((on_dir && vauth_dir_owner(vcp)) ||
+ (!on_dir && vauth_file_owner(vcp))) {
+ _SETWHERE("user");
+ if (!owner_ok)
+ error = EACCES;
+ goto out;
+ }
+
+ /* Not owner; if group and world both grant it we're done */
+ if (group_ok && world_ok) {
+ _SETWHERE("group/world");
+ goto out;
+ }
+ if (!group_ok && !world_ok) {
+ _SETWHERE("group/world");
+ error = EACCES;
+ goto out;
+ }
+
+ /* Check group membership (most expensive) */
+ ismember = 0; /* Default to allow, if the target has no group owner */
+
+ /*
+ * In the case we can't get an answer about the user from the call to
+ * vauth_dir_ingroup() or vauth_file_ingroup(), we want to fail on
+ * the side of caution, rather than simply granting access, or we will
+ * fail to correctly implement exclusion groups, so we set the third
+ * parameter on the basis of the state of 'group_ok'.
+ */
+ if (on_dir) {
+ error = vauth_dir_ingroup(vcp, &ismember, (!group_ok ? EACCES : 0));
+ } else {
+ error = vauth_file_ingroup(vcp, &ismember, (!group_ok ? EACCES : 0));
+ }
+ if (error) {
+ if (!group_ok)
+ ismember = 1;
+ error = 0;
+ }
+ if (ismember) {
+ _SETWHERE("group");
+ if (!group_ok)
+ error = EACCES;
+ goto out;
+ }
+
+ /* Not owner, not in group, use world result */
+ _SETWHERE("world");
+ if (!world_ok)
+ error = EACCES;
+
+ /* FALLTHROUGH */
+
+out:
+ KAUTH_DEBUG("%p %s - posix %s permissions : need %s%s%s %x have %s%s%s%s%s%s%s%s%s UID = %d file = %d,%d",
+ vcp->vp, (error == 0) ? "ALLOWED" : "DENIED", where,
+ (action & VREAD) ? "r" : "-",
+ (action & VWRITE) ? "w" : "-",
+ (action & VEXEC) ? "x" : "-",
+ needed,
+ (vap->va_mode & S_IRUSR) ? "r" : "-",
+ (vap->va_mode & S_IWUSR) ? "w" : "-",
+ (vap->va_mode & S_IXUSR) ? "x" : "-",
+ (vap->va_mode & S_IRGRP) ? "r" : "-",
+ (vap->va_mode & S_IWGRP) ? "w" : "-",
+ (vap->va_mode & S_IXGRP) ? "x" : "-",
+ (vap->va_mode & S_IROTH) ? "r" : "-",
+ (vap->va_mode & S_IWOTH) ? "w" : "-",
+ (vap->va_mode & S_IXOTH) ? "x" : "-",
+ kauth_cred_getuid(vcp->ctx->vc_ucred),
+ on_dir ? vcp->dvap->va_uid : vcp->vap->va_uid,
+ on_dir ? vcp->dvap->va_gid : vcp->vap->va_gid);
+ return(error);
+}
+
+/*
+ * Authorize the deletion of the node vp from the directory dvp.
+ *
+ * We assume that:
+ * - Neither the node nor the directory are immutable.
+ * - The user is not the superuser.
+ *
+ * Deletion is not permitted if the directory is sticky and the caller is
+ * not owner of the node or directory.
+ *
+ * If either the node grants DELETE, or the directory grants DELETE_CHILD,
+ * the node may be deleted. If neither denies the permission, and the
+ * caller has Posix write access to the directory, then the node may be
+ * deleted.
+ *
+ * As an optimization, we cache whether or not delete child is permitted
+ * on directories without the sticky bit set.
+ */
+int
+vnode_authorize_delete(vauth_ctx vcp, boolean_t cached_delete_child);
+/*static*/ int
+vnode_authorize_delete(vauth_ctx vcp, boolean_t cached_delete_child)
+{
+ struct vnode_attr *vap = vcp->vap;
+ struct vnode_attr *dvap = vcp->dvap;
+ kauth_cred_t cred = vcp->ctx->vc_ucred;
+ struct kauth_acl_eval eval;
+ int error, delete_denied, delete_child_denied, ismember;
+
+ /* check the ACL on the directory */
+ delete_child_denied = 0;
+ if (!cached_delete_child && VATTR_IS_NOT(dvap, va_acl, NULL)) {
+ eval.ae_requested = KAUTH_VNODE_DELETE_CHILD;
+ eval.ae_acl = &dvap->va_acl->acl_ace[0];
+ eval.ae_count = dvap->va_acl->acl_entrycount;
+ eval.ae_options = 0;
+ if (vauth_dir_owner(vcp))
+ eval.ae_options |= KAUTH_AEVAL_IS_OWNER;
+ /*
+ * We use ENOENT as a marker to indicate we could not get
+ * information in order to delay evaluation until after we
+ * have the ACL evaluation answer. Previously, we would
+ * always deny the operation at this point.
+ */
+ if ((error = vauth_dir_ingroup(vcp, &ismember, ENOENT)) != 0 && error != ENOENT)
+ return(error);
+ if (error == ENOENT)
+ eval.ae_options |= KAUTH_AEVAL_IN_GROUP_UNKNOWN;
+ else if (ismember)
+ eval.ae_options |= KAUTH_AEVAL_IN_GROUP;
+ eval.ae_exp_gall = KAUTH_VNODE_GENERIC_ALL_BITS;
+ eval.ae_exp_gread = KAUTH_VNODE_GENERIC_READ_BITS;
+ eval.ae_exp_gwrite = KAUTH_VNODE_GENERIC_WRITE_BITS;
+ eval.ae_exp_gexec = KAUTH_VNODE_GENERIC_EXECUTE_BITS;
+
+ /*
+ * If there is no entry, we are going to defer to other
+ * authorization mechanisms.
+ */
+ error = kauth_acl_evaluate(cred, &eval);
+
+ if (error != 0) {
+ KAUTH_DEBUG("%p ERROR during ACL processing - %d", vcp->vp, error);
+ return(error);
+ }
+ switch(eval.ae_result) {
+ case KAUTH_RESULT_DENY:
+ delete_child_denied = 1;
+ break;
+ /* FALLSTHROUGH */
+ case KAUTH_RESULT_ALLOW:
+ KAUTH_DEBUG("%p ALLOWED - granted by directory ACL", vcp->vp);
+ return(0);
+ case KAUTH_RESULT_DEFER:
+ default:
+ /* Effectively the same as !delete_child_denied */
+ KAUTH_DEBUG("%p DEFERRED - directory ACL", vcp->vp);
+ break;
+ }
+ }
+
+ /* check the ACL on the node */
+ delete_denied = 0;
+ if (VATTR_IS_NOT(vap, va_acl, NULL)) {
+ eval.ae_requested = KAUTH_VNODE_DELETE;
+ eval.ae_acl = &vap->va_acl->acl_ace[0];
+ eval.ae_count = vap->va_acl->acl_entrycount;
+ eval.ae_options = 0;
+ if (vauth_file_owner(vcp))
+ eval.ae_options |= KAUTH_AEVAL_IS_OWNER;
+ /*
+ * We use ENOENT as a marker to indicate we could not get
+ * information in order to delay evaluation until after we
+ * have the ACL evaluation answer. Previously, we would
+ * always deny the operation at this point.
+ */
+ if ((error = vauth_file_ingroup(vcp, &ismember, ENOENT)) != 0 && error != ENOENT)
+ return(error);
+ if (error == ENOENT)
+ eval.ae_options |= KAUTH_AEVAL_IN_GROUP_UNKNOWN;
+ else if (ismember)
+ eval.ae_options |= KAUTH_AEVAL_IN_GROUP;
+ eval.ae_exp_gall = KAUTH_VNODE_GENERIC_ALL_BITS;
+ eval.ae_exp_gread = KAUTH_VNODE_GENERIC_READ_BITS;
+ eval.ae_exp_gwrite = KAUTH_VNODE_GENERIC_WRITE_BITS;
+ eval.ae_exp_gexec = KAUTH_VNODE_GENERIC_EXECUTE_BITS;
+
+ if ((error = kauth_acl_evaluate(cred, &eval)) != 0) {
+ KAUTH_DEBUG("%p ERROR during ACL processing - %d", vcp->vp, error);
+ return(error);
+ }
+
+ switch(eval.ae_result) {
+ case KAUTH_RESULT_DENY:
+ delete_denied = 1;
+ break;
+ case KAUTH_RESULT_ALLOW:
+ KAUTH_DEBUG("%p ALLOWED - granted by file ACL", vcp->vp);
+ return(0);
+ case KAUTH_RESULT_DEFER:
+ default:
+ /* Effectively the same as !delete_child_denied */
+ KAUTH_DEBUG("%p DEFERRED%s - by file ACL", vcp->vp, delete_denied ? "(DENY)" : "");
+ break;
+ }
+ }
+
+ /* if denied by ACL on directory or node, return denial */
+ if (delete_denied || delete_child_denied) {
+ KAUTH_DEBUG("%p DENIED - denied by ACL", vcp->vp);
+ return(EACCES);
+ }
+
+ /* enforce sticky bit behaviour */
+ if ((dvap->va_mode & S_ISTXT) && !vauth_file_owner(vcp) && !vauth_dir_owner(vcp)) {
+ KAUTH_DEBUG("%p DENIED - sticky bit rules (user %d file %d dir %d)",
+ vcp->vp, cred->cr_posix.cr_uid, vap->va_uid, dvap->va_uid);
+ return(EACCES);
+ }
+
+ /* check the directory */
+ if (!cached_delete_child && (error = vnode_authorize_posix(vcp, VWRITE, 1 /* on_dir */)) != 0) {
+ KAUTH_DEBUG("%p DENIED - denied by posix permisssions", vcp->vp);
+ return(error);
+ }
+
+ /* not denied, must be OK */
+ return(0);
+}
+
+
+/*
+ * Authorize an operation based on the node's attributes.
+ */
+static int
+vnode_authorize_simple(vauth_ctx vcp, kauth_ace_rights_t acl_rights, kauth_ace_rights_t preauth_rights, boolean_t *found_deny)
+{
+ struct vnode_attr *vap = vcp->vap;
+ kauth_cred_t cred = vcp->ctx->vc_ucred;
+ struct kauth_acl_eval eval;
+ int error, ismember;
+ mode_t posix_action;
+
+ /*
+ * If we are the file owner, we automatically have some rights.
+ *
+ * Do we need to expand this to support group ownership?
+ */
+ if (vauth_file_owner(vcp))
+ acl_rights &= ~(KAUTH_VNODE_WRITE_SECURITY);
+
+ /*
+ * If we are checking both TAKE_OWNERSHIP and WRITE_SECURITY, we can
+ * mask the latter. If TAKE_OWNERSHIP is requested the caller is about to
+ * change ownership to themselves, and WRITE_SECURITY is implicitly
+ * granted to the owner. We need to do this because at this point
+ * WRITE_SECURITY may not be granted as the caller is not currently
+ * the owner.
+ */
+ if ((acl_rights & KAUTH_VNODE_TAKE_OWNERSHIP) &&
+ (acl_rights & KAUTH_VNODE_WRITE_SECURITY))
+ acl_rights &= ~KAUTH_VNODE_WRITE_SECURITY;
+
+ if (acl_rights == 0) {
+ KAUTH_DEBUG("%p ALLOWED - implicit or no rights required", vcp->vp);
+ return(0);
+ }
+
+ /* if we have an ACL, evaluate it */
+ if (VATTR_IS_NOT(vap, va_acl, NULL)) {
+ eval.ae_requested = acl_rights;
+ eval.ae_acl = &vap->va_acl->acl_ace[0];
+ eval.ae_count = vap->va_acl->acl_entrycount;
+ eval.ae_options = 0;
+ if (vauth_file_owner(vcp))
+ eval.ae_options |= KAUTH_AEVAL_IS_OWNER;
+ /*
+ * We use ENOENT as a marker to indicate we could not get
+ * information in order to delay evaluation until after we
+ * have the ACL evaluation answer. Previously, we would
+ * always deny the operation at this point.
+ */
+ if ((error = vauth_file_ingroup(vcp, &ismember, ENOENT)) != 0 && error != ENOENT)
+ return(error);
+ if (error == ENOENT)
+ eval.ae_options |= KAUTH_AEVAL_IN_GROUP_UNKNOWN;
+ else if (ismember)
+ eval.ae_options |= KAUTH_AEVAL_IN_GROUP;
+ eval.ae_exp_gall = KAUTH_VNODE_GENERIC_ALL_BITS;
+ eval.ae_exp_gread = KAUTH_VNODE_GENERIC_READ_BITS;
+ eval.ae_exp_gwrite = KAUTH_VNODE_GENERIC_WRITE_BITS;
+ eval.ae_exp_gexec = KAUTH_VNODE_GENERIC_EXECUTE_BITS;
+
+ if ((error = kauth_acl_evaluate(cred, &eval)) != 0) {
+ KAUTH_DEBUG("%p ERROR during ACL processing - %d", vcp->vp, error);
+ return(error);
+ }
+
+ switch(eval.ae_result) {
+ case KAUTH_RESULT_DENY:
+ KAUTH_DEBUG("%p DENIED - by ACL", vcp->vp);
+ return(EACCES); /* deny, deny, counter-allege */
+ case KAUTH_RESULT_ALLOW:
+ KAUTH_DEBUG("%p ALLOWED - all rights granted by ACL", vcp->vp);
+ return(0);
+ case KAUTH_RESULT_DEFER:
+ default:
+ /* Effectively the same as !delete_child_denied */
+ KAUTH_DEBUG("%p DEFERRED - directory ACL", vcp->vp);
+ break;
+ }
+
+ *found_deny = eval.ae_found_deny;
+
+ /* fall through and evaluate residual rights */
+ } else {
+ /* no ACL, everything is residual */
+ eval.ae_residual = acl_rights;
+ }
+
+ /*
+ * Grant residual rights that have been pre-authorized.
+ */
+ eval.ae_residual &= ~preauth_rights;
+
+ /*
+ * We grant WRITE_ATTRIBUTES to the owner if it hasn't been denied.
+ */
+ if (vauth_file_owner(vcp))
+ eval.ae_residual &= ~KAUTH_VNODE_WRITE_ATTRIBUTES;
+
+ if (eval.ae_residual == 0) {
+ KAUTH_DEBUG("%p ALLOWED - rights already authorized", vcp->vp);
+ return(0);
+ }
+
+ /*
+ * Bail if we have residual rights that can't be granted by posix permissions,
+ * or aren't presumed granted at this point.
+ *
+ * XXX these can be collapsed for performance
+ */
+ if (eval.ae_residual & KAUTH_VNODE_CHANGE_OWNER) {
+ KAUTH_DEBUG("%p DENIED - CHANGE_OWNER not permitted", vcp->vp);
+ return(EACCES);
+ }
+ if (eval.ae_residual & KAUTH_VNODE_WRITE_SECURITY) {
+ KAUTH_DEBUG("%p DENIED - WRITE_SECURITY not permitted", vcp->vp);
+ return(EACCES);
+ }
+
+#if DIAGNOSTIC
+ if (eval.ae_residual & KAUTH_VNODE_DELETE)
+ panic("vnode_authorize: can't be checking delete permission here");
+#endif
+
+ /*
+ * Compute the fallback posix permissions that will satisfy the remaining
+ * rights.
+ */
+ posix_action = 0;
+ if (eval.ae_residual & (KAUTH_VNODE_READ_DATA |
+ KAUTH_VNODE_LIST_DIRECTORY |
+ KAUTH_VNODE_READ_EXTATTRIBUTES))
+ posix_action |= VREAD;
+ if (eval.ae_residual & (KAUTH_VNODE_WRITE_DATA |
+ KAUTH_VNODE_ADD_FILE |
+ KAUTH_VNODE_ADD_SUBDIRECTORY |
+ KAUTH_VNODE_DELETE_CHILD |
+ KAUTH_VNODE_WRITE_ATTRIBUTES |
+ KAUTH_VNODE_WRITE_EXTATTRIBUTES))
+ posix_action |= VWRITE;
+ if (eval.ae_residual & (KAUTH_VNODE_EXECUTE |
+ KAUTH_VNODE_SEARCH))
+ posix_action |= VEXEC;
+
+ if (posix_action != 0) {
+ return(vnode_authorize_posix(vcp, posix_action, 0 /* !on_dir */));
+ } else {
+ KAUTH_DEBUG("%p ALLOWED - residual rights %s%s%s%s%s%s%s%s%s%s%s%s%s%s granted due to no posix mapping",
+ vcp->vp,
+ (eval.ae_residual & KAUTH_VNODE_READ_DATA)
+ ? vnode_isdir(vcp->vp) ? " LIST_DIRECTORY" : " READ_DATA" : "",
+ (eval.ae_residual & KAUTH_VNODE_WRITE_DATA)
+ ? vnode_isdir(vcp->vp) ? " ADD_FILE" : " WRITE_DATA" : "",
+ (eval.ae_residual & KAUTH_VNODE_EXECUTE)
+ ? vnode_isdir(vcp->vp) ? " SEARCH" : " EXECUTE" : "",
+ (eval.ae_residual & KAUTH_VNODE_DELETE)
+ ? " DELETE" : "",
+ (eval.ae_residual & KAUTH_VNODE_APPEND_DATA)
+ ? vnode_isdir(vcp->vp) ? " ADD_SUBDIRECTORY" : " APPEND_DATA" : "",
+ (eval.ae_residual & KAUTH_VNODE_DELETE_CHILD)
+ ? " DELETE_CHILD" : "",
+ (eval.ae_residual & KAUTH_VNODE_READ_ATTRIBUTES)
+ ? " READ_ATTRIBUTES" : "",
+ (eval.ae_residual & KAUTH_VNODE_WRITE_ATTRIBUTES)
+ ? " WRITE_ATTRIBUTES" : "",
+ (eval.ae_residual & KAUTH_VNODE_READ_EXTATTRIBUTES)
+ ? " READ_EXTATTRIBUTES" : "",
+ (eval.ae_residual & KAUTH_VNODE_WRITE_EXTATTRIBUTES)
+ ? " WRITE_EXTATTRIBUTES" : "",
+ (eval.ae_residual & KAUTH_VNODE_READ_SECURITY)
+ ? " READ_SECURITY" : "",
+ (eval.ae_residual & KAUTH_VNODE_WRITE_SECURITY)
+ ? " WRITE_SECURITY" : "",
+ (eval.ae_residual & KAUTH_VNODE_CHECKIMMUTABLE)
+ ? " CHECKIMMUTABLE" : "",
+ (eval.ae_residual & KAUTH_VNODE_CHANGE_OWNER)
+ ? " CHANGE_OWNER" : "");
+ }
+
+ /*
+ * Lack of required Posix permissions implies no reason to deny access.
+ */
+ return(0);
+}
+
+/*
+ * Check for file immutability.
+ */
+static int
+vnode_authorize_checkimmutable(vnode_t vp, struct vnode_attr *vap, int rights, int ignore)
+{
+ mount_t mp;
+ int error;
+ int append;
+
+ /*
+ * Perform immutability checks for operations that change data.
+ *
+ * Sockets, fifos and devices require special handling.
+ */
+ switch(vp->v_type) {
+ case VSOCK:
+ case VFIFO:
+ case VBLK:
+ case VCHR:
+ /*
+ * Writing to these nodes does not change the filesystem data,
+ * so forget that it's being tried.
+ */
+ rights &= ~KAUTH_VNODE_WRITE_DATA;
+ break;
+ default:
+ break;
+ }
+
+ error = 0;
+ if (rights & KAUTH_VNODE_WRITE_RIGHTS) {
+
+ /* check per-filesystem options if possible */
+ mp = vp->v_mount;
+ if (mp != NULL) {
+
+ /* check for no-EA filesystems */
+ if ((rights & KAUTH_VNODE_WRITE_EXTATTRIBUTES) &&
+ (vfs_flags(mp) & MNT_NOUSERXATTR)) {
+ KAUTH_DEBUG("%p DENIED - filesystem disallowed extended attributes", vp);
+ error = EACCES; /* User attributes disabled */
+ goto out;
+ }
+ }
+
+ /*
+ * check for file immutability. first, check if the requested rights are
+ * allowable for a UF_APPEND file.
+ */
+ append = 0;
+ if (vp->v_type == VDIR) {
+ if ((rights & (KAUTH_VNODE_ADD_FILE | KAUTH_VNODE_ADD_SUBDIRECTORY | KAUTH_VNODE_WRITE_EXTATTRIBUTES)) == rights)
+ append = 1;
+ } else {
+ if ((rights & (KAUTH_VNODE_APPEND_DATA | KAUTH_VNODE_WRITE_EXTATTRIBUTES)) == rights)
+ append = 1;
+ }
+ if ((error = vnode_immutable(vap, append, ignore)) != 0) {
+ KAUTH_DEBUG("%p DENIED - file is immutable", vp);
+ goto out;
+ }
+ }
+out:
+ return(error);
+}
+
+/*
+ * Handle authorization actions for filesystems that advertise that the
+ * server will be enforcing.
+ *
+ * Returns: 0 Authorization should be handled locally
+ * 1 Authorization was handled by the FS
+ *
+ * Note: Imputed returns will only occur if the authorization request
+ * was handled by the FS.
+ *
+ * Imputed: *resultp, modified Return code from FS when the request is
+ * handled by the FS.
+ * VNOP_ACCESS:???
+ * VNOP_OPEN:???
+ */
+static int
+vnode_authorize_opaque(vnode_t vp, int *resultp, kauth_action_t action, vfs_context_t ctx)
+{
+ int error;
+
+ /*
+ * If the vp is a device node, socket or FIFO it actually represents a local
+ * endpoint, so we need to handle it locally.
+ */
+ switch(vp->v_type) {
+ case VBLK:
+ case VCHR:
+ case VSOCK:
+ case VFIFO:
+ return(0);
+ default:
+ break;
+ }
+
+ /*
+ * In the advisory request case, if the filesystem doesn't think it's reliable
+ * we will attempt to formulate a result ourselves based on VNOP_GETATTR data.
+ */
+ if ((action & KAUTH_VNODE_ACCESS) && !vfs_authopaqueaccess(vp->v_mount))
+ return(0);
+
+ /*
+ * Let the filesystem have a say in the matter. It's OK for it to not implemnent
+ * VNOP_ACCESS, as most will authorise inline with the actual request.
+ */
+ if ((error = VNOP_ACCESS(vp, action, ctx)) != ENOTSUP) {
+ *resultp = error;
+ KAUTH_DEBUG("%p DENIED - opaque filesystem VNOP_ACCESS denied access", vp);
+ return(1);
+ }
+
+ /*
+ * Typically opaque filesystems do authorisation in-line, but exec is a special case. In
+ * order to be reasonably sure that exec will be permitted, we try a bit harder here.
+ */
+ if ((action & KAUTH_VNODE_EXECUTE) && (vp->v_type == VREG)) {
+ /* try a VNOP_OPEN for readonly access */
+ if ((error = VNOP_OPEN(vp, FREAD, ctx)) != 0) {
+ *resultp = error;
+ KAUTH_DEBUG("%p DENIED - EXECUTE denied because file could not be opened readonly", vp);
+ return(1);
+ }
+ VNOP_CLOSE(vp, FREAD, ctx);
+ }
+
+ /*
+ * We don't have any reason to believe that the request has to be denied at this point,
+ * so go ahead and allow it.
+ */
+ *resultp = 0;
+ KAUTH_DEBUG("%p ALLOWED - bypassing access check for non-local filesystem", vp);
+ return(1);
+}
+
+
+
+
+/*
+ * Returns: KAUTH_RESULT_ALLOW
+ * KAUTH_RESULT_DENY
+ *
+ * Imputed: *arg3, modified Error code in the deny case
+ * EROFS Read-only file system
+ * EACCES Permission denied
+ * EPERM Operation not permitted [no execute]
+ * vnode_getattr:ENOMEM Not enough space [only if has filesec]
+ * vnode_getattr:???
+ * vnode_authorize_opaque:*arg2 ???
+ * vnode_authorize_checkimmutable:???
+ * vnode_authorize_delete:???
+ * vnode_authorize_simple:???
+ */
+
+
+static int
+vnode_authorize_callback(kauth_cred_t cred, void *idata, kauth_action_t action,
+ uintptr_t arg0, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3)
+{
+ vfs_context_t ctx;
+ vnode_t cvp = NULLVP;
+ vnode_t vp, dvp;
+ int result = KAUTH_RESULT_DENY;
+ int parent_iocount = 0;
+ int parent_action; /* In case we need to use namedstream's data fork for cached rights*/
+
+ ctx = (vfs_context_t)arg0;
+ vp = (vnode_t)arg1;
+ dvp = (vnode_t)arg2;
+
+ /*
+ * if there are 2 vnodes passed in, we don't know at
+ * this point which rights to look at based on the
+ * combined action being passed in... defer until later...
+ * otherwise check the kauth 'rights' cache hung
+ * off of the vnode we're interested in... if we've already
+ * been granted the right we're currently interested in,
+ * we can just return success... otherwise we'll go through
+ * the process of authorizing the requested right(s)... if that
+ * succeeds, we'll add the right(s) to the cache.
+ * VNOP_SETATTR and VNOP_SETXATTR will invalidate this cache
+ */
+ if (dvp && vp)
+ goto defer;
+ if (dvp) {
+ cvp = dvp;
+ } else {
+ /*
+ * For named streams on local-authorization volumes, rights are cached on the parent;
+ * authorization is determined by looking at the parent's properties anyway, so storing
+ * on the parent means that we don't recompute for the named stream and that if
+ * we need to flush rights (e.g. on VNOP_SETATTR()) we don't need to track down the
+ * stream to flush its cache separately. If we miss in the cache, then we authorize
+ * as if there were no cached rights (passing the named stream vnode and desired rights to
+ * vnode_authorize_callback_int()).
+ *
+ * On an opaquely authorized volume, we don't know the relationship between the
+ * data fork's properties and the rights granted on a stream. Thus, named stream vnodes
+ * on such a volume are authorized directly (rather than using the parent) and have their
+ * own caches. When a named stream vnode is created, we mark the parent as having a named
+ * stream. On a VNOP_SETATTR() for the parent that may invalidate cached authorization, we
+ * find the stream and flush its cache.
+ */
+ if (vnode_isnamedstream(vp) && (!vfs_authopaque(vp->v_mount))) {
+ cvp = vnode_getparent(vp);
+ if (cvp != NULLVP) {
+ parent_iocount = 1;
+ } else {
+ cvp = NULL;
+ goto defer; /* If we can't use the parent, take the slow path */
+ }
+
+ /* Have to translate some actions */
+ parent_action = action;
+ if (parent_action & KAUTH_VNODE_READ_DATA) {
+ parent_action &= ~KAUTH_VNODE_READ_DATA;
+ parent_action |= KAUTH_VNODE_READ_EXTATTRIBUTES;
+ }
+ if (parent_action & KAUTH_VNODE_WRITE_DATA) {
+ parent_action &= ~KAUTH_VNODE_WRITE_DATA;
+ parent_action |= KAUTH_VNODE_WRITE_EXTATTRIBUTES;
+ }
+
+ } else {
+ cvp = vp;
+ }
+ }
+
+ if (vnode_cache_is_authorized(cvp, ctx, parent_iocount ? parent_action : action) == TRUE) {
+ result = KAUTH_RESULT_ALLOW;
+ goto out;
+ }
+defer:
+ result = vnode_authorize_callback_int(cred, idata, action, arg0, arg1, arg2, arg3);
+
+ if (result == KAUTH_RESULT_ALLOW && cvp != NULLVP) {
+ KAUTH_DEBUG("%p - caching action = %x", cvp, action);
+ vnode_cache_authorized_action(cvp, ctx, action);
+ }
+
+out:
+ if (parent_iocount) {
+ vnode_put(cvp);
+ }
+
+ return result;
+}
+
+
+static int
+vnode_authorize_callback_int(__unused kauth_cred_t unused_cred, __unused void *idata, kauth_action_t action,
+ uintptr_t arg0, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3)
+{
+ struct _vnode_authorize_context auth_context;
+ vauth_ctx vcp;
+ vfs_context_t ctx;
+ vnode_t vp, dvp;
+ kauth_cred_t cred;
+ kauth_ace_rights_t rights;
+ struct vnode_attr va, dva;
+ int result;
+ int *errorp;
+ int noimmutable;
+ boolean_t parent_authorized_for_delete_child = FALSE;
+ boolean_t found_deny = FALSE;
+ boolean_t parent_ref= FALSE;
+
+ vcp = &auth_context;
+ ctx = vcp->ctx = (vfs_context_t)arg0;
+ vp = vcp->vp = (vnode_t)arg1;
+ dvp = vcp->dvp = (vnode_t)arg2;
+ errorp = (int *)arg3;
+ /*
+ * Note that we authorize against the context, not the passed cred
+ * (the same thing anyway)
+ */
+ cred = ctx->vc_ucred;
+
+ VATTR_INIT(&va);
+ vcp->vap = &va;
+ VATTR_INIT(&dva);
+ vcp->dvap = &dva;
+
+ vcp->flags = vcp->flags_valid = 0;
+
+#if DIAGNOSTIC
+ if ((ctx == NULL) || (vp == NULL) || (cred == NULL))
+ panic("vnode_authorize: bad arguments (context %p vp %p cred %p)", ctx, vp, cred);
+#endif
+
+ KAUTH_DEBUG("%p AUTH - %s %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s on %s '%s' (0x%x:%p/%p)",
+ vp, vfs_context_proc(ctx)->p_comm,
+ (action & KAUTH_VNODE_ACCESS) ? "access" : "auth",
+ (action & KAUTH_VNODE_READ_DATA) ? vnode_isdir(vp) ? " LIST_DIRECTORY" : " READ_DATA" : "",
+ (action & KAUTH_VNODE_WRITE_DATA) ? vnode_isdir(vp) ? " ADD_FILE" : " WRITE_DATA" : "",
+ (action & KAUTH_VNODE_EXECUTE) ? vnode_isdir(vp) ? " SEARCH" : " EXECUTE" : "",
+ (action & KAUTH_VNODE_DELETE) ? " DELETE" : "",
+ (action & KAUTH_VNODE_APPEND_DATA) ? vnode_isdir(vp) ? " ADD_SUBDIRECTORY" : " APPEND_DATA" : "",
+ (action & KAUTH_VNODE_DELETE_CHILD) ? " DELETE_CHILD" : "",
+ (action & KAUTH_VNODE_READ_ATTRIBUTES) ? " READ_ATTRIBUTES" : "",
+ (action & KAUTH_VNODE_WRITE_ATTRIBUTES) ? " WRITE_ATTRIBUTES" : "",
+ (action & KAUTH_VNODE_READ_EXTATTRIBUTES) ? " READ_EXTATTRIBUTES" : "",
+ (action & KAUTH_VNODE_WRITE_EXTATTRIBUTES) ? " WRITE_EXTATTRIBUTES" : "",
+ (action & KAUTH_VNODE_READ_SECURITY) ? " READ_SECURITY" : "",
+ (action & KAUTH_VNODE_WRITE_SECURITY) ? " WRITE_SECURITY" : "",
+ (action & KAUTH_VNODE_CHANGE_OWNER) ? " CHANGE_OWNER" : "",
+ (action & KAUTH_VNODE_NOIMMUTABLE) ? " (noimmutable)" : "",
+ vnode_isdir(vp) ? "directory" : "file",
+ vp->v_name ? vp->v_name : "<NULL>", action, vp, dvp);
+
+ /*
+ * Extract the control bits from the action, everything else is
+ * requested rights.
+ */
+ noimmutable = (action & KAUTH_VNODE_NOIMMUTABLE) ? 1 : 0;
+ rights = action & ~(KAUTH_VNODE_ACCESS | KAUTH_VNODE_NOIMMUTABLE);
+
+ if (rights & KAUTH_VNODE_DELETE) {
+#if DIAGNOSTIC
+ if (dvp == NULL)
+ panic("vnode_authorize: KAUTH_VNODE_DELETE test requires a directory");
+#endif
+ /*
+ * check to see if we've already authorized the parent
+ * directory for deletion of its children... if so, we
+ * can skip a whole bunch of work... we will still have to
+ * authorize that this specific child can be removed
+ */
+ if (vnode_cache_is_authorized(dvp, ctx, KAUTH_VNODE_DELETE_CHILD) == TRUE)
+ parent_authorized_for_delete_child = TRUE;
+ } else {
+ dvp = NULL;
+ }
+
+ /*
+ * Check for read-only filesystems.
+ */
+ if ((rights & KAUTH_VNODE_WRITE_RIGHTS) &&
+ (vp->v_mount->mnt_flag & MNT_RDONLY) &&
+ ((vp->v_type == VREG) || (vp->v_type == VDIR) ||
+ (vp->v_type == VLNK) || (vp->v_type == VCPLX) ||
+ (rights & KAUTH_VNODE_DELETE) || (rights & KAUTH_VNODE_DELETE_CHILD))) {
+ result = EROFS;
+ goto out;
+ }
+
+ /*
+ * Check for noexec filesystems.
+ */
+ if ((rights & KAUTH_VNODE_EXECUTE) && (vp->v_type == VREG) && (vp->v_mount->mnt_flag & MNT_NOEXEC)) {
+ result = EACCES;
+ goto out;
+ }
+
+ /*
+ * Handle cases related to filesystems with non-local enforcement.
+ * This call can return 0, in which case we will fall through to perform a
+ * check based on VNOP_GETATTR data. Otherwise it returns 1 and sets
+ * an appropriate result, at which point we can return immediately.
+ */
+ if ((vp->v_mount->mnt_kern_flag & MNTK_AUTH_OPAQUE) && vnode_authorize_opaque(vp, &result, action, ctx))
+ goto out;
+
+ /*
+ * Get vnode attributes and extended security information for the vnode
+ * and directory if required.
+ */
+ VATTR_WANTED(&va, va_mode);
+ VATTR_WANTED(&va, va_uid);
+ VATTR_WANTED(&va, va_gid);
+ VATTR_WANTED(&va, va_flags);
+ VATTR_WANTED(&va, va_acl);
+ if ((result = vnode_getattr(vp, &va, ctx)) != 0) {
+ KAUTH_DEBUG("%p ERROR - failed to get vnode attributes - %d", vp, result);
+ goto out;
+ }
+ if (dvp) {
+ VATTR_WANTED(&dva, va_mode);
+ VATTR_WANTED(&dva, va_uid);
+ VATTR_WANTED(&dva, va_gid);
+ VATTR_WANTED(&dva, va_flags);
+ VATTR_WANTED(&dva, va_acl);
+ if ((result = vnode_getattr(dvp, &dva, ctx)) != 0) {
+ KAUTH_DEBUG("%p ERROR - failed to get directory vnode attributes - %d", vp, result);
+ goto out;
+ }
+ }
+
+ /*
+ * If the vnode is an extended attribute data vnode (eg. a resource fork), *_DATA becomes
+ * *_EXTATTRIBUTES.
+ */
+ if (vnode_isnamedstream(vp)) {
+ if (rights & KAUTH_VNODE_READ_DATA) {
+ rights &= ~KAUTH_VNODE_READ_DATA;
+ rights |= KAUTH_VNODE_READ_EXTATTRIBUTES;
+ }
+ if (rights & KAUTH_VNODE_WRITE_DATA) {
+ rights &= ~KAUTH_VNODE_WRITE_DATA;
+ rights |= KAUTH_VNODE_WRITE_EXTATTRIBUTES;
+ }
+ }
+
+ /*
+ * Point 'vp' to the resource fork's parent for ACL checking
+ */
+ if (vnode_isnamedstream(vp) &&
+ (vp->v_parent != NULL) &&
+ (vget_internal(vp->v_parent, 0, VNODE_NODEAD | VNODE_DRAINO) == 0)) {
+ parent_ref = TRUE;
+ vcp->vp = vp = vp->v_parent;
+ if (VATTR_IS_SUPPORTED(&va, va_acl) && (va.va_acl != NULL))
+ kauth_acl_free(va.va_acl);
+ VATTR_INIT(&va);
+ VATTR_WANTED(&va, va_mode);
+ VATTR_WANTED(&va, va_uid);
+ VATTR_WANTED(&va, va_gid);
+ VATTR_WANTED(&va, va_flags);
+ VATTR_WANTED(&va, va_acl);
+ if ((result = vnode_getattr(vp, &va, ctx)) != 0)
+ goto out;
+ }
+
+ /*
+ * Check for immutability.
+ *
+ * In the deletion case, parent directory immutability vetoes specific
+ * file rights.
+ */
+ if ((result = vnode_authorize_checkimmutable(vp, &va, rights, noimmutable)) != 0)
+ goto out;
+ if ((rights & KAUTH_VNODE_DELETE) &&
+ parent_authorized_for_delete_child == FALSE &&
+ ((result = vnode_authorize_checkimmutable(dvp, &dva, KAUTH_VNODE_DELETE_CHILD, 0)) != 0))
+ goto out;
+
+ /*
+ * Clear rights that have been authorized by reaching this point, bail if nothing left to
+ * check.
+ */
+ rights &= ~(KAUTH_VNODE_LINKTARGET | KAUTH_VNODE_CHECKIMMUTABLE);
+ if (rights == 0)
+ goto out;
+
+ /*
+ * If we're not the superuser, authorize based on file properties;
+ * note that even if parent_authorized_for_delete_child is TRUE, we
+ * need to check on the node itself.
+ */
+ if (!vfs_context_issuser(ctx)) {
+ /* process delete rights */
+ if ((rights & KAUTH_VNODE_DELETE) &&
+ ((result = vnode_authorize_delete(vcp, parent_authorized_for_delete_child)) != 0))
+ goto out;
+
+ /* process remaining rights */
+ if ((rights & ~KAUTH_VNODE_DELETE) &&
+ (result = vnode_authorize_simple(vcp, rights, rights & KAUTH_VNODE_DELETE, &found_deny)) != 0)
+ goto out;
+ } else {
+
+ /*
+ * Execute is only granted to root if one of the x bits is set. This check only
+ * makes sense if the posix mode bits are actually supported.
+ */
+ if ((rights & KAUTH_VNODE_EXECUTE) &&
+ (vp->v_type == VREG) &&
+ VATTR_IS_SUPPORTED(&va, va_mode) &&
+ !(va.va_mode & (S_IXUSR | S_IXGRP | S_IXOTH))) {
+ result = EPERM;
+ KAUTH_DEBUG("%p DENIED - root execute requires at least one x bit in 0x%x", vp, va.va_mode);
+ goto out;
+ }
+
+ KAUTH_DEBUG("%p ALLOWED - caller is superuser", vp);
+ }
+out:
+ if (VATTR_IS_SUPPORTED(&va, va_acl) && (va.va_acl != NULL))
+ kauth_acl_free(va.va_acl);
+ if (VATTR_IS_SUPPORTED(&dva, va_acl) && (dva.va_acl != NULL))
+ kauth_acl_free(dva.va_acl);
+
+ if (result) {
+ if (parent_ref)
+ vnode_put(vp);
+ *errorp = result;
+ KAUTH_DEBUG("%p DENIED - auth denied", vp);
+ return(KAUTH_RESULT_DENY);
+ }
+ if ((rights & KAUTH_VNODE_SEARCH) && found_deny == FALSE && vp->v_type == VDIR) {
+ /*
+ * if we were successfully granted the right to search this directory
+ * and there were NO ACL DENYs for search and the posix permissions also don't
+ * deny execute, we can synthesize a global right that allows anyone to
+ * traverse this directory during a pathname lookup without having to
+ * match the credential associated with this cache of rights.
+ */
+ if (!VATTR_IS_SUPPORTED(&va, va_mode) ||
+ ((va.va_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) ==
+ (S_IXUSR | S_IXGRP | S_IXOTH))) {
+ vnode_cache_authorized_action(vp, ctx, KAUTH_VNODE_SEARCHBYANYONE);
+ }
+ }
+ if ((rights & KAUTH_VNODE_DELETE) && parent_authorized_for_delete_child == FALSE) {
+ /*
+ * parent was successfully and newly authorized for content deletions
+ * add it to the cache, but only if it doesn't have the sticky
+ * bit set on it. This same check is done earlier guarding
+ * fetching of dva, and if we jumped to out without having done
+ * this, we will have returned already because of a non-zero
+ * 'result' value.
+ */
+ if (VATTR_IS_SUPPORTED(&dva, va_mode) &&
+ !(dva.va_mode & (S_ISVTX))) {
+ /* OK to cache delete rights */
+ KAUTH_DEBUG("%p - caching DELETE_CHILD rights", dvp);
+ vnode_cache_authorized_action(dvp, ctx, KAUTH_VNODE_DELETE_CHILD);
+ }
+ }
+ if (parent_ref)
+ vnode_put(vp);
+ /*
+ * Note that this implies that we will allow requests for no rights, as well as
+ * for rights that we do not recognise. There should be none of these.
+ */
+ KAUTH_DEBUG("%p ALLOWED - auth granted", vp);
+ return(KAUTH_RESULT_ALLOW);
+}
+
+int
+vnode_authattr_new(vnode_t dvp, struct vnode_attr *vap, int noauth, vfs_context_t ctx)
+{
+ return vnode_authattr_new_internal(dvp, vap, noauth, NULL, ctx);
+}
+
+/*
+ * Check that the attribute information in vattr can be legally applied to
+ * a new file by the context.
+ */
+static int
+vnode_authattr_new_internal(vnode_t dvp, struct vnode_attr *vap, int noauth, uint32_t *defaulted_fieldsp, vfs_context_t ctx)
+{
+ int error;
+ int has_priv_suser, ismember, defaulted_owner, defaulted_group, defaulted_mode;
+ kauth_cred_t cred;
+ guid_t changer;
+ mount_t dmp;
+
+ error = 0;
+
+ if (defaulted_fieldsp) {
+ *defaulted_fieldsp = 0;
+ }
+
+ defaulted_owner = defaulted_group = defaulted_mode = 0;
+
+ /*
+ * Require that the filesystem support extended security to apply any.
+ */
+ if (!vfs_extendedsecurity(dvp->v_mount) &&
+ (VATTR_IS_ACTIVE(vap, va_acl) || VATTR_IS_ACTIVE(vap, va_uuuid) || VATTR_IS_ACTIVE(vap, va_guuid))) {
+ error = EINVAL;
+ goto out;
+ }
+
+ /*
+ * Default some fields.
+ */
+ dmp = dvp->v_mount;
+
+ /*
+ * If the filesystem is mounted IGNORE_OWNERSHIP and an explicit owner is set, that
+ * owner takes ownership of all new files.
+ */
+ if ((dmp->mnt_flag & MNT_IGNORE_OWNERSHIP) && (dmp->mnt_fsowner != KAUTH_UID_NONE)) {
+ VATTR_SET(vap, va_uid, dmp->mnt_fsowner);
+ defaulted_owner = 1;
+ } else {
+ if (!VATTR_IS_ACTIVE(vap, va_uid)) {
+ /* default owner is current user */
+ VATTR_SET(vap, va_uid, kauth_cred_getuid(vfs_context_ucred(ctx)));
+ defaulted_owner = 1;
+ }
+ }
+
+ /*
+ * If the filesystem is mounted IGNORE_OWNERSHIP and an explicit grouo is set, that
+ * group takes ownership of all new files.
+ */
+ if ((dmp->mnt_flag & MNT_IGNORE_OWNERSHIP) && (dmp->mnt_fsgroup != KAUTH_GID_NONE)) {
+ VATTR_SET(vap, va_gid, dmp->mnt_fsgroup);
+ defaulted_group = 1;
+ } else {
+ if (!VATTR_IS_ACTIVE(vap, va_gid)) {
+ /* default group comes from parent object, fallback to current user */
+ struct vnode_attr dva;
+ VATTR_INIT(&dva);
+ VATTR_WANTED(&dva, va_gid);
+ if ((error = vnode_getattr(dvp, &dva, ctx)) != 0)
+ goto out;
+ if (VATTR_IS_SUPPORTED(&dva, va_gid)) {
+ VATTR_SET(vap, va_gid, dva.va_gid);
+ } else {
+ VATTR_SET(vap, va_gid, kauth_cred_getgid(vfs_context_ucred(ctx)));
+ }
+ defaulted_group = 1;
+ }
+ }
+
+ if (!VATTR_IS_ACTIVE(vap, va_flags))
+ VATTR_SET(vap, va_flags, 0);
+
+ /* default mode is everything, masked with current umask */
+ if (!VATTR_IS_ACTIVE(vap, va_mode)) {
+ VATTR_SET(vap, va_mode, ACCESSPERMS & ~vfs_context_proc(ctx)->p_fd->fd_cmask);
+ KAUTH_DEBUG("ATTR - defaulting new file mode to %o from umask %o", vap->va_mode, vfs_context_proc(ctx)->p_fd->fd_cmask);
+ defaulted_mode = 1;
+ }
+ /* set timestamps to now */
+ if (!VATTR_IS_ACTIVE(vap, va_create_time)) {
+ nanotime(&vap->va_create_time);
+ VATTR_SET_ACTIVE(vap, va_create_time);
+ }
+
+ /*
+ * Check for attempts to set nonsensical fields.
+ */
+ if (vap->va_active & ~VNODE_ATTR_NEWOBJ) {
+ error = EINVAL;
+ KAUTH_DEBUG("ATTR - ERROR - attempt to set unsupported new-file attributes %llx",
+ vap->va_active & ~VNODE_ATTR_NEWOBJ);
+ goto out;
+ }
+
+ /*
+ * Quickly check for the applicability of any enforcement here.
+ * Tests below maintain the integrity of the local security model.
+ */
+ if (vfs_authopaque(dvp->v_mount))
+ goto out;
+
+ /*
+ * We need to know if the caller is the superuser, or if the work is
+ * otherwise already authorised.
+ */
+ cred = vfs_context_ucred(ctx);
+ if (noauth) {
+ /* doing work for the kernel */
+ has_priv_suser = 1;
+ } else {
+ has_priv_suser = vfs_context_issuser(ctx);
+ }
+
+
+ if (VATTR_IS_ACTIVE(vap, va_flags)) {
+ if (has_priv_suser) {
+ if ((vap->va_flags & (UF_SETTABLE | SF_SETTABLE)) != vap->va_flags) {
+ error = EPERM;
+ KAUTH_DEBUG(" DENIED - superuser attempt to set illegal flag(s)");
+ goto out;
+ }
+ } else {
+ if ((vap->va_flags & UF_SETTABLE) != vap->va_flags) {
+ error = EPERM;
+ KAUTH_DEBUG(" DENIED - user attempt to set illegal flag(s)");
+ goto out;
+ }
+ }
+ }
+
+ /* if not superuser, validate legality of new-item attributes */
+ if (!has_priv_suser) {
+ if (!defaulted_mode && VATTR_IS_ACTIVE(vap, va_mode)) {
+ /* setgid? */
+ if (vap->va_mode & S_ISGID) {
+ if ((error = kauth_cred_ismember_gid(cred, vap->va_gid, &ismember)) != 0) {
+ KAUTH_DEBUG("ATTR - ERROR: got %d checking for membership in %d", error, vap->va_gid);
+ goto out;
+ }
+ if (!ismember) {
+ KAUTH_DEBUG(" DENIED - can't set SGID bit, not a member of %d", vap->va_gid);
+ error = EPERM;
+ goto out;
+ }
+ }
+
+ /* setuid? */
+ if ((vap->va_mode & S_ISUID) && (vap->va_uid != kauth_cred_getuid(cred))) {
+ KAUTH_DEBUG("ATTR - ERROR: illegal attempt to set the setuid bit");
+ error = EPERM;
+ goto out;
+ }
+ }
+ if (!defaulted_owner && (vap->va_uid != kauth_cred_getuid(cred))) {
+ KAUTH_DEBUG(" DENIED - cannot create new item owned by %d", vap->va_uid);
+ error = EPERM;
+ goto out;
+ }
+ if (!defaulted_group) {
+ if ((error = kauth_cred_ismember_gid(cred, vap->va_gid, &ismember)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d checking for membership in %d", error, vap->va_gid);
+ goto out;
+ }
+ if (!ismember) {
+ KAUTH_DEBUG(" DENIED - cannot create new item with group %d - not a member", vap->va_gid);
+ error = EPERM;
+ goto out;
+ }
+ }
+
+ /* initialising owner/group UUID */
+ if (VATTR_IS_ACTIVE(vap, va_uuuid)) {
+ if ((error = kauth_cred_getguid(cred, &changer)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d trying to get caller UUID", error);
+ /* XXX ENOENT here - no GUID - should perhaps become EPERM */
+ goto out;
+ }
+ if (!kauth_guid_equal(&vap->va_uuuid, &changer)) {
+ KAUTH_DEBUG(" ERROR - cannot create item with supplied owner UUID - not us");
+ error = EPERM;
+ goto out;
+ }
+ }
+ if (VATTR_IS_ACTIVE(vap, va_guuid)) {
+ if ((error = kauth_cred_ismember_guid(cred, &vap->va_guuid, &ismember)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d trying to check group membership", error);
+ goto out;
+ }
+ if (!ismember) {
+ KAUTH_DEBUG(" ERROR - cannot create item with supplied group UUID - not a member");
+ error = EPERM;
+ goto out;
+ }
+ }
+ }
+out:
+ if (defaulted_fieldsp) {
+ if (defaulted_mode) {
+ *defaulted_fieldsp |= VATTR_PREPARE_DEFAULTED_MODE;
+ }
+ if (defaulted_group) {
+ *defaulted_fieldsp |= VATTR_PREPARE_DEFAULTED_GID;
+ }
+ if (defaulted_owner) {
+ *defaulted_fieldsp |= VATTR_PREPARE_DEFAULTED_UID;
+ }
+ }
+ return(error);
+}
+
+/*
+ * Check that the attribute information in vap can be legally written by the
+ * context.
+ *
+ * Call this when you're not sure about the vnode_attr; either its contents
+ * have come from an unknown source, or when they are variable.
+ *
+ * Returns errno, or zero and sets *actionp to the KAUTH_VNODE_* actions that
+ * must be authorized to be permitted to write the vattr.
+ */
+int
+vnode_authattr(vnode_t vp, struct vnode_attr *vap, kauth_action_t *actionp, vfs_context_t ctx)
+{
+ struct vnode_attr ova;
+ kauth_action_t required_action;
+ int error, has_priv_suser, ismember, chowner, chgroup, clear_suid, clear_sgid;
+ guid_t changer;
+ gid_t group;
+ uid_t owner;
+ mode_t newmode;
+ kauth_cred_t cred;
+ uint32_t fdelta;
+
+ VATTR_INIT(&ova);
+ required_action = 0;
+ error = 0;
+
+ /*
+ * Quickly check for enforcement applicability.
+ */
+ if (vfs_authopaque(vp->v_mount))
+ goto out;
+
+ /*
+ * Check for attempts to set nonsensical fields.
+ */
+ if (vap->va_active & VNODE_ATTR_RDONLY) {
+ KAUTH_DEBUG("ATTR - ERROR: attempt to set readonly attribute(s)");
+ error = EINVAL;
+ goto out;
+ }
+
+ /*
+ * We need to know if the caller is the superuser.
+ */
+ cred = vfs_context_ucred(ctx);
+ has_priv_suser = kauth_cred_issuser(cred);
+
+ /*
+ * If any of the following are changing, we need information from the old file:
+ * va_uid
+ * va_gid
+ * va_mode
+ * va_uuuid
+ * va_guuid
+ */
+ if (VATTR_IS_ACTIVE(vap, va_uid) ||
+ VATTR_IS_ACTIVE(vap, va_gid) ||
+ VATTR_IS_ACTIVE(vap, va_mode) ||
+ VATTR_IS_ACTIVE(vap, va_uuuid) ||
+ VATTR_IS_ACTIVE(vap, va_guuid)) {
+ VATTR_WANTED(&ova, va_mode);
+ VATTR_WANTED(&ova, va_uid);
+ VATTR_WANTED(&ova, va_gid);
+ VATTR_WANTED(&ova, va_uuuid);
+ VATTR_WANTED(&ova, va_guuid);
+ KAUTH_DEBUG("ATTR - security information changing, fetching existing attributes");
+ }
+
+ /*
+ * If timestamps are being changed, we need to know who the file is owned
+ * by.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_create_time) ||
+ VATTR_IS_ACTIVE(vap, va_change_time) ||
+ VATTR_IS_ACTIVE(vap, va_modify_time) ||
+ VATTR_IS_ACTIVE(vap, va_access_time) ||
+ VATTR_IS_ACTIVE(vap, va_backup_time)) {
+
+ VATTR_WANTED(&ova, va_uid);
+#if 0 /* enable this when we support UUIDs as official owners */
+ VATTR_WANTED(&ova, va_uuuid);
+#endif
+ KAUTH_DEBUG("ATTR - timestamps changing, fetching uid and GUID");
+ }
+
+ /*
+ * If flags are being changed, we need the old flags.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_flags)) {
+ KAUTH_DEBUG("ATTR - flags changing, fetching old flags");
+ VATTR_WANTED(&ova, va_flags);
+ }
+
+ /*
+ * If ACLs are being changed, we need the old ACLs.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_acl)) {
+ KAUTH_DEBUG("ATTR - acl changing, fetching old flags");
+ VATTR_WANTED(&ova, va_acl);
+ }
+
+ /*
+ * If the size is being set, make sure it's not a directory.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_data_size)) {
+ /* size is meaningless on a directory, don't permit this */
+ if (vnode_isdir(vp)) {
+ KAUTH_DEBUG("ATTR - ERROR: size change requested on a directory");
+ error = EISDIR;
+ goto out;
+ }
+ }
+
+ /*
+ * Get old data.
+ */
+ KAUTH_DEBUG("ATTR - fetching old attributes %016llx", ova.va_active);
+ if ((error = vnode_getattr(vp, &ova, ctx)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d trying to get attributes", error);
+ goto out;
+ }
+
+ /*
+ * Size changes require write access to the file data.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_data_size)) {
+ /* if we can't get the size, or it's different, we need write access */
+ KAUTH_DEBUG("ATTR - size change, requiring WRITE_DATA");
+ required_action |= KAUTH_VNODE_WRITE_DATA;
+ }
+
+ /*
+ * Changing timestamps?
+ *
+ * Note that we are only called to authorize user-requested time changes;
+ * side-effect time changes are not authorized. Authorisation is only
+ * required for existing files.
+ *
+ * Non-owners are not permitted to change the time on an existing
+ * file to anything other than the current time.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_create_time) ||
+ VATTR_IS_ACTIVE(vap, va_change_time) ||
+ VATTR_IS_ACTIVE(vap, va_modify_time) ||
+ VATTR_IS_ACTIVE(vap, va_access_time) ||
+ VATTR_IS_ACTIVE(vap, va_backup_time)) {
+ /*
+ * The owner and root may set any timestamps they like,
+ * provided that the file is not immutable. The owner still needs
+ * WRITE_ATTRIBUTES (implied by ownership but still deniable).
+ */
+ if (has_priv_suser || vauth_node_owner(&ova, cred)) {
+ KAUTH_DEBUG("ATTR - root or owner changing timestamps");
+ required_action |= KAUTH_VNODE_CHECKIMMUTABLE | KAUTH_VNODE_WRITE_ATTRIBUTES;
+ } else {
+ /* just setting the current time? */
+ if (vap->va_vaflags & VA_UTIMES_NULL) {
+ KAUTH_DEBUG("ATTR - non-root/owner changing timestamps, requiring WRITE_ATTRIBUTES");
+ required_action |= KAUTH_VNODE_WRITE_ATTRIBUTES;
+ } else {
+ KAUTH_DEBUG("ATTR - ERROR: illegal timestamp modification attempted");
+ error = EACCES;
+ goto out;
+ }
+ }
+ }
+
+ /*
+ * Changing file mode?
+ */
+ if (VATTR_IS_ACTIVE(vap, va_mode) && VATTR_IS_SUPPORTED(&ova, va_mode) && (ova.va_mode != vap->va_mode)) {
+ KAUTH_DEBUG("ATTR - mode change from %06o to %06o", ova.va_mode, vap->va_mode);
+
+ /*
+ * Mode changes always have the same basic auth requirements.
+ */
+ if (has_priv_suser) {
+ KAUTH_DEBUG("ATTR - superuser mode change, requiring immutability check");
+ required_action |= KAUTH_VNODE_CHECKIMMUTABLE;
+ } else {
+ /* need WRITE_SECURITY */
+ KAUTH_DEBUG("ATTR - non-superuser mode change, requiring WRITE_SECURITY");
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ }
+
+ /*
+ * Can't set the setgid bit if you're not in the group and not root. Have to have
+ * existing group information in the case we're not setting it right now.
+ */
+ if (vap->va_mode & S_ISGID) {
+ required_action |= KAUTH_VNODE_CHECKIMMUTABLE; /* always required */
+ if (!has_priv_suser) {
+ if (VATTR_IS_ACTIVE(vap, va_gid)) {
+ group = vap->va_gid;
+ } else if (VATTR_IS_SUPPORTED(&ova, va_gid)) {
+ group = ova.va_gid;
+ } else {
+ KAUTH_DEBUG("ATTR - ERROR: setgid but no gid available");
+ error = EINVAL;
+ goto out;
+ }
+ /*
+ * This might be too restrictive; WRITE_SECURITY might be implied by
+ * membership in this case, rather than being an additional requirement.
+ */
+ if ((error = kauth_cred_ismember_gid(cred, group, &ismember)) != 0) {
+ KAUTH_DEBUG("ATTR - ERROR: got %d checking for membership in %d", error, vap->va_gid);
+ goto out;
+ }
+ if (!ismember) {
+ KAUTH_DEBUG(" DENIED - can't set SGID bit, not a member of %d", group);
+ error = EPERM;
+ goto out;
+ }
+ }
+ }
+
+ /*
+ * Can't set the setuid bit unless you're root or the file's owner.
+ */
+ if (vap->va_mode & S_ISUID) {
+ required_action |= KAUTH_VNODE_CHECKIMMUTABLE; /* always required */
+ if (!has_priv_suser) {
+ if (VATTR_IS_ACTIVE(vap, va_uid)) {
+ owner = vap->va_uid;
+ } else if (VATTR_IS_SUPPORTED(&ova, va_uid)) {
+ owner = ova.va_uid;
+ } else {
+ KAUTH_DEBUG("ATTR - ERROR: setuid but no uid available");
+ error = EINVAL;
+ goto out;
+ }
+ if (owner != kauth_cred_getuid(cred)) {
+ /*
+ * We could allow this if WRITE_SECURITY is permitted, perhaps.
+ */
+ KAUTH_DEBUG("ATTR - ERROR: illegal attempt to set the setuid bit");
+ error = EPERM;
+ goto out;
+ }
+ }
+ }
+ }
+
+ /*
+ * Validate/mask flags changes. This checks that only the flags in
+ * the UF_SETTABLE mask are being set, and preserves the flags in
+ * the SF_SETTABLE case.
+ *
+ * Since flags changes may be made in conjunction with other changes,
+ * we will ask the auth code to ignore immutability in the case that
+ * the SF_* flags are not set and we are only manipulating the file flags.
+ *
+ */
+ if (VATTR_IS_ACTIVE(vap, va_flags)) {
+ /* compute changing flags bits */
+ if (VATTR_IS_SUPPORTED(&ova, va_flags)) {
+ fdelta = vap->va_flags ^ ova.va_flags;
+ } else {
+ fdelta = vap->va_flags;
+ }
+
+ if (fdelta != 0) {
+ KAUTH_DEBUG("ATTR - flags changing, requiring WRITE_SECURITY");
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+
+ /* check that changing bits are legal */
+ if (has_priv_suser) {
+ /*
+ * The immutability check will prevent us from clearing the SF_*
+ * flags unless the system securelevel permits it, so just check
+ * for legal flags here.
+ */
+ if (fdelta & ~(UF_SETTABLE | SF_SETTABLE)) {
+ error = EPERM;
+ KAUTH_DEBUG(" DENIED - superuser attempt to set illegal flag(s)");
+ goto out;
+ }
+ } else {
+ if (fdelta & ~UF_SETTABLE) {
+ error = EPERM;
+ KAUTH_DEBUG(" DENIED - user attempt to set illegal flag(s)");
+ goto out;
+ }
+ }
+ /*
+ * If the caller has the ability to manipulate file flags,
+ * security is not reduced by ignoring them for this operation.
+ *
+ * A more complete test here would consider the 'after' states of the flags
+ * to determine whether it would permit the operation, but this becomes
+ * very complex.
+ *
+ * Ignoring immutability is conditional on securelevel; this does not bypass
+ * the SF_* flags if securelevel > 0.
+ */
+ required_action |= KAUTH_VNODE_NOIMMUTABLE;
+ }
+ }
+
+ /*
+ * Validate ownership information.
+ */
+ chowner = 0;
+ chgroup = 0;
+ clear_suid = 0;
+ clear_sgid = 0;
+
+ /*
+ * uid changing
+ * Note that if the filesystem didn't give us a UID, we expect that it doesn't
+ * support them in general, and will ignore it if/when we try to set it.
+ * We might want to clear the uid out of vap completely here.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_uid)) {
+ if (VATTR_IS_SUPPORTED(&ova, va_uid) && (vap->va_uid != ova.va_uid)) {
+ if (!has_priv_suser && (kauth_cred_getuid(cred) != vap->va_uid)) {
+ KAUTH_DEBUG(" DENIED - non-superuser cannot change ownershipt to a third party");
+ error = EPERM;
+ goto out;
+ }
+ chowner = 1;
+ }
+ clear_suid = 1;
+ }
+
+ /*
+ * gid changing
+ * Note that if the filesystem didn't give us a GID, we expect that it doesn't
+ * support them in general, and will ignore it if/when we try to set it.
+ * We might want to clear the gid out of vap completely here.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_gid)) {
+ if (VATTR_IS_SUPPORTED(&ova, va_gid) && (vap->va_gid != ova.va_gid)) {
+ if (!has_priv_suser) {
+ if ((error = kauth_cred_ismember_gid(cred, vap->va_gid, &ismember)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d checking for membership in %d", error, vap->va_gid);
+ goto out;
+ }
+ if (!ismember) {
+ KAUTH_DEBUG(" DENIED - group change from %d to %d but not a member of target group",
+ ova.va_gid, vap->va_gid);
+ error = EPERM;
+ goto out;
+ }
+ }
+ chgroup = 1;
+ }
+ clear_sgid = 1;
+ }
+
+ /*
+ * Owner UUID being set or changed.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_uuuid)) {
+ /* if the owner UUID is not actually changing ... */
+ if (VATTR_IS_SUPPORTED(&ova, va_uuuid)) {
+ if (kauth_guid_equal(&vap->va_uuuid, &ova.va_uuuid))
+ goto no_uuuid_change;
+
+ /*
+ * If the current owner UUID is a null GUID, check
+ * it against the UUID corresponding to the owner UID.
+ */
+ if (kauth_guid_equal(&ova.va_uuuid, &kauth_null_guid) &&
+ VATTR_IS_SUPPORTED(&ova, va_uid)) {
+ guid_t uid_guid;
+
+ if (kauth_cred_uid2guid(ova.va_uid, &uid_guid) == 0 &&
+ kauth_guid_equal(&vap->va_uuuid, &uid_guid))
+ goto no_uuuid_change;
+ }
+ }
+
+ /*
+ * The owner UUID cannot be set by a non-superuser to anything other than
+ * their own or a null GUID (to "unset" the owner UUID).
+ * Note that file systems must be prepared to handle the
+ * null UUID case in a manner appropriate for that file
+ * system.
+ */
+ if (!has_priv_suser) {
+ if ((error = kauth_cred_getguid(cred, &changer)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d trying to get caller UUID", error);
+ /* XXX ENOENT here - no UUID - should perhaps become EPERM */
+ goto out;
+ }
+ if (!kauth_guid_equal(&vap->va_uuuid, &changer) &&
+ !kauth_guid_equal(&vap->va_uuuid, &kauth_null_guid)) {
+ KAUTH_DEBUG(" ERROR - cannot set supplied owner UUID - not us / null");
+ error = EPERM;
+ goto out;
+ }
+ }
+ chowner = 1;
+ clear_suid = 1;
+ }
+no_uuuid_change:
+ /*
+ * Group UUID being set or changed.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_guuid)) {
+ /* if the group UUID is not actually changing ... */
+ if (VATTR_IS_SUPPORTED(&ova, va_guuid)) {
+ if (kauth_guid_equal(&vap->va_guuid, &ova.va_guuid))
+ goto no_guuid_change;
+
+ /*
+ * If the current group UUID is a null UUID, check
+ * it against the UUID corresponding to the group GID.
+ */
+ if (kauth_guid_equal(&ova.va_guuid, &kauth_null_guid) &&
+ VATTR_IS_SUPPORTED(&ova, va_gid)) {
+ guid_t gid_guid;
+
+ if (kauth_cred_gid2guid(ova.va_gid, &gid_guid) == 0 &&
+ kauth_guid_equal(&vap->va_guuid, &gid_guid))
+ goto no_guuid_change;
+ }
+ }
+
+ /*
+ * The group UUID cannot be set by a non-superuser to anything other than
+ * one of which they are a member or a null GUID (to "unset"
+ * the group UUID).
+ * Note that file systems must be prepared to handle the
+ * null UUID case in a manner appropriate for that file
+ * system.
+ */
+ if (!has_priv_suser) {
+ if (kauth_guid_equal(&vap->va_guuid, &kauth_null_guid))
+ ismember = 1;
+ else if ((error = kauth_cred_ismember_guid(cred, &vap->va_guuid, &ismember)) != 0) {
+ KAUTH_DEBUG(" ERROR - got %d trying to check group membership", error);
+ goto out;
+ }
+ if (!ismember) {
+ KAUTH_DEBUG(" ERROR - cannot set supplied group UUID - not a member / null");
+ error = EPERM;
+ goto out;
+ }
+ }
+ chgroup = 1;
+ }
+no_guuid_change:
+
+ /*
+ * Compute authorisation for group/ownership changes.
+ */
+ if (chowner || chgroup || clear_suid || clear_sgid) {
+ if (has_priv_suser) {
+ KAUTH_DEBUG("ATTR - superuser changing file owner/group, requiring immutability check");
+ required_action |= KAUTH_VNODE_CHECKIMMUTABLE;
+ } else {
+ if (chowner) {
+ KAUTH_DEBUG("ATTR - ownership change, requiring TAKE_OWNERSHIP");
+ required_action |= KAUTH_VNODE_TAKE_OWNERSHIP;
+ }
+ if (chgroup && !chowner) {
+ KAUTH_DEBUG("ATTR - group change, requiring WRITE_SECURITY");
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ }
+
+ /* clear set-uid and set-gid bits as required by Posix */
+ if (VATTR_IS_ACTIVE(vap, va_mode)) {
+ newmode = vap->va_mode;
+ } else if (VATTR_IS_SUPPORTED(&ova, va_mode)) {
+ newmode = ova.va_mode;
+ } else {
+ KAUTH_DEBUG("CHOWN - trying to change owner but cannot get mode from filesystem to mask setugid bits");
+ newmode = 0;
+ }
+ if (newmode & (S_ISUID | S_ISGID)) {
+ VATTR_SET(vap, va_mode, newmode & ~(S_ISUID | S_ISGID));
+ KAUTH_DEBUG("CHOWN - masking setugid bits from mode %o to %o", newmode, vap->va_mode);
+ }
+ }
+ }
+
+ /*
+ * Authorise changes in the ACL.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_acl)) {
+
+ /* no existing ACL */
+ if (!VATTR_IS_ACTIVE(&ova, va_acl) || (ova.va_acl == NULL)) {
+
+ /* adding an ACL */
+ if (vap->va_acl != NULL) {
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ KAUTH_DEBUG("CHMOD - adding ACL");
+ }
+
+ /* removing an existing ACL */
+ } else if (vap->va_acl == NULL) {
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ KAUTH_DEBUG("CHMOD - removing ACL");
+
+ /* updating an existing ACL */
+ } else {
+ if (vap->va_acl->acl_entrycount != ova.va_acl->acl_entrycount) {
+ /* entry count changed, must be different */
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ KAUTH_DEBUG("CHMOD - adding/removing ACL entries");
+ } else if (vap->va_acl->acl_entrycount > 0) {
+ /* both ACLs have the same ACE count, said count is 1 or more, bitwise compare ACLs */
+ if (memcmp(&vap->va_acl->acl_ace[0], &ova.va_acl->acl_ace[0],
+ sizeof(struct kauth_ace) * vap->va_acl->acl_entrycount)) {
+ required_action |= KAUTH_VNODE_WRITE_SECURITY;
+ KAUTH_DEBUG("CHMOD - changing ACL entries");
+ }
+ }
+ }
+ }
+
+ /*
+ * Other attributes that require authorisation.
+ */
+ if (VATTR_IS_ACTIVE(vap, va_encoding))
+ required_action |= KAUTH_VNODE_WRITE_ATTRIBUTES;
+
+out:
+ if (VATTR_IS_SUPPORTED(&ova, va_acl) && (ova.va_acl != NULL))
+ kauth_acl_free(ova.va_acl);
+ if (error == 0)
+ *actionp = required_action;
+ return(error);
+}
+
+static int
+setlocklocal_callback(struct vnode *vp, __unused void *cargs)
+{
+ vnode_lock_spin(vp);
+ vp->v_flag |= VLOCKLOCAL;
+ vnode_unlock(vp);
+
+ return (VNODE_RETURNED);
+}
+
+void
+vfs_setlocklocal(mount_t mp)
+{
+ mount_lock_spin(mp);
+ mp->mnt_kern_flag |= MNTK_LOCK_LOCAL;
+ mount_unlock(mp);
+
+ /*
+ * The number of active vnodes is expected to be
+ * very small when vfs_setlocklocal is invoked.
+ */
+ vnode_iterate(mp, 0, setlocklocal_callback, NULL);
+}
+
+void
+vfs_setunmountpreflight(mount_t mp)
+{
+ mount_lock_spin(mp);
+ mp->mnt_kern_flag |= MNTK_UNMOUNT_PREFLIGHT;
+ mount_unlock(mp);
+}
+
+void
+vfs_setcompoundopen(mount_t mp)
+{
+ mount_lock_spin(mp);
+ mp->mnt_compound_ops |= COMPOUND_VNOP_OPEN;
+ mount_unlock(mp);
+}
+
+void
+vn_setunionwait(vnode_t vp)
+{
+ vnode_lock_spin(vp);
+ vp->v_flag |= VISUNION;
+ vnode_unlock(vp);
+}
+
+
+void
+vn_checkunionwait(vnode_t vp)
+{
+ vnode_lock_spin(vp);
+ while ((vp->v_flag & VISUNION) == VISUNION)
+ msleep((caddr_t)&vp->v_flag, &vp->v_lock, 0, 0, 0);
+ vnode_unlock(vp);
+}
+
+void
+vn_clearunionwait(vnode_t vp, int locked)
+{
+ if (!locked)
+ vnode_lock_spin(vp);
+ if((vp->v_flag & VISUNION) == VISUNION) {
+ vp->v_flag &= ~VISUNION;
+ wakeup((caddr_t)&vp->v_flag);
+ }
+ if (!locked)
+ vnode_unlock(vp);
+}
+
+/*
+ * XXX - get "don't trigger mounts" flag for thread; used by autofs.
+ */
+extern int thread_notrigger(void);
+
+int
+thread_notrigger(void)
+{
+ struct uthread *uth = (struct uthread *)get_bsdthread_info(current_thread());
+ return (uth->uu_notrigger);
+}
+
+/*
+ * Removes orphaned apple double files during a rmdir
+ * Works by:
+ * 1. vnode_suspend().
+ * 2. Call VNOP_READDIR() till the end of directory is reached.
+ * 3. Check if the directory entries returned are regular files with name starting with "._". If not, return ENOTEMPTY.
+ * 4. Continue (2) and (3) till end of directory is reached.
+ * 5. If all the entries in the directory were files with "._" name, delete all the files.
+ * 6. vnode_resume()
+ * 7. If deletion of all files succeeded, call VNOP_RMDIR() again.
+ */
+
+errno_t rmdir_remove_orphaned_appleDouble(vnode_t vp , vfs_context_t ctx, int * restart_flag)
+{
+
+#define UIO_BUFF_SIZE 2048
+ uio_t auio = NULL;
+ int eofflag, siz = UIO_BUFF_SIZE, nentries = 0;
+ int open_flag = 0, full_erase_flag = 0;
+ char uio_buf[ UIO_SIZEOF(1) ];
+ char *rbuf = NULL, *cpos, *cend;
+ struct nameidata nd_temp;
+ struct dirent *dp;
+ errno_t error;
+
+ error = vnode_suspend(vp);
+
+ /*
+ * restart_flag is set so that the calling rmdir sleeps and resets
+ */
+ if (error == EBUSY)
+ *restart_flag = 1;
+ if (error != 0)
+ goto outsc;
+
+ /*
+ * set up UIO
+ */
+ MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
+ if (rbuf)
+ auio = uio_createwithbuffer(1, 0, UIO_SYSSPACE, UIO_READ,
+ &uio_buf[0], sizeof(uio_buf));
+ if (!rbuf || !auio) {
+ error = ENOMEM;
+ goto outsc;
+ }
+
+ uio_setoffset(auio,0);
+
+ eofflag = 0;
+
+ if ((error = VNOP_OPEN(vp, FREAD, ctx)))
+ goto outsc;
+ else
+ open_flag = 1;
+
+ /*
+ * First pass checks if all files are appleDouble files.
+ */
+
+ do {
+ siz = UIO_BUFF_SIZE;
+ uio_reset(auio, uio_offset(auio), UIO_SYSSPACE, UIO_READ);
+ uio_addiov(auio, CAST_USER_ADDR_T(rbuf), UIO_BUFF_SIZE);
+
+ if((error = VNOP_READDIR(vp, auio, 0, &eofflag, &nentries, ctx)))
+ goto outsc;
+
+ if (uio_resid(auio) != 0)
+ siz -= uio_resid(auio);
+
+ /*
+ * Iterate through directory
+ */
+ cpos = rbuf;
+ cend = rbuf + siz;
+ dp = (struct dirent*) cpos;
+
+ if (cpos == cend)
+ eofflag = 1;
+
+ while ((cpos < cend)) {
+ /*
+ * Check for . and .. as well as directories
+ */
+ if (dp->d_ino != 0 &&
+ !((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
+ (dp->d_namlen == 2 && dp->d_name[0] == '.' && dp->d_name[1] == '.'))) {
+ /*
+ * Check for irregular files and ._ files
+ * If there is a ._._ file abort the op
+ */
+ if ( dp->d_namlen < 2 ||
+ strncmp(dp->d_name,"._",2) ||
+ (dp->d_namlen >= 4 && !strncmp(&(dp->d_name[2]), "._",2))) {
+ error = ENOTEMPTY;
+ goto outsc;
+ }
+ }
+ cpos += dp->d_reclen;
+ dp = (struct dirent*)cpos;
+ }
+
+ /*
+ * workaround for HFS/NFS setting eofflag before end of file
+ */
+ if (vp->v_tag == VT_HFS && nentries > 2)
+ eofflag=0;
+
+ if (vp->v_tag == VT_NFS) {
+ if (eofflag && !full_erase_flag) {
+ full_erase_flag = 1;
+ eofflag = 0;
+ uio_reset(auio, 0, UIO_SYSSPACE, UIO_READ);
+ }
+ else if (!eofflag && full_erase_flag)
+ full_erase_flag = 0;
+ }
+
+ } while (!eofflag);
+ /*
+ * If we've made it here all the files in the dir are ._ files.
+ * We can delete the files even though the node is suspended
+ * because we are the owner of the file.
+ */
+
+ uio_reset(auio, 0, UIO_SYSSPACE, UIO_READ);
+ eofflag = 0;
+ full_erase_flag = 0;
+
+ do {
+ siz = UIO_BUFF_SIZE;
+ uio_reset(auio, uio_offset(auio), UIO_SYSSPACE, UIO_READ);
+ uio_addiov(auio, CAST_USER_ADDR_T(rbuf), UIO_BUFF_SIZE);
+
+ error = VNOP_READDIR(vp, auio, 0, &eofflag, &nentries, ctx);
+
+ if (error != 0)
+ goto outsc;
+
+ if (uio_resid(auio) != 0)
+ siz -= uio_resid(auio);
+
+ /*
+ * Iterate through directory
+ */
+ cpos = rbuf;
+ cend = rbuf + siz;
+ dp = (struct dirent*) cpos;
+
+ if (cpos == cend)
+ eofflag = 1;
+
+ while ((cpos < cend)) {
+ /*
+ * Check for . and .. as well as directories
+ */
+ if (dp->d_ino != 0 &&
+ !((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
+ (dp->d_namlen == 2 && dp->d_name[0] == '.' && dp->d_name[1] == '.'))
+ ) {
+
+ NDINIT(&nd_temp, DELETE, OP_UNLINK, USEDVP,
+ UIO_SYSSPACE, CAST_USER_ADDR_T(dp->d_name),
+ ctx);
+ nd_temp.ni_dvp = vp;
+ error = unlink1(ctx, &nd_temp, 0);
+
+ if (error && error != ENOENT) {
+ goto outsc;
+ }
+
+ }
+ cpos += dp->d_reclen;
+ dp = (struct dirent*)cpos;
+ }
+
+ /*
+ * workaround for HFS/NFS setting eofflag before end of file
+ */
+ if (vp->v_tag == VT_HFS && nentries > 2)
+ eofflag=0;
+
+ if (vp->v_tag == VT_NFS) {
+ if (eofflag && !full_erase_flag) {
+ full_erase_flag = 1;
+ eofflag = 0;
+ uio_reset(auio, 0, UIO_SYSSPACE, UIO_READ);
+ }
+ else if (!eofflag && full_erase_flag)
+ full_erase_flag = 0;
+ }
+
+ } while (!eofflag);
+
+
+ error = 0;
+
+outsc:
+ if (open_flag)
+ VNOP_CLOSE(vp, FREAD, ctx);
+
+ uio_free(auio);
+ FREE(rbuf, M_TEMP);
+
+ vnode_resume(vp);
+
+
+ return(error);
+
+}
+
+
+void
+lock_vnode_and_post(vnode_t vp, int kevent_num)
+{
+ /* Only take the lock if there's something there! */
+ if (vp->v_knotes.slh_first != NULL) {
+ vnode_lock(vp);
+ KNOTE(&vp->v_knotes, kevent_num);
+ vnode_unlock(vp);
+ }
+}
+
+#ifdef JOE_DEBUG
+static void record_vp(vnode_t vp, int count) {
+ struct uthread *ut;
+
+#if CONFIG_TRIGGERS
+ if (vp->v_resolve)
+ return;
+#endif
+ if ((vp->v_flag & VSYSTEM))
+ return;
+
+ ut = get_bsdthread_info(current_thread());
+ ut->uu_iocount += count;
+
+ if (count == 1) {
+ if (ut->uu_vpindex < 32) {
+ OSBacktrace((void **)&ut->uu_pcs[ut->uu_vpindex][0], 10);
+
+ ut->uu_vps[ut->uu_vpindex] = vp;
+ ut->uu_vpindex++;
}
}
- rn = (*rnh->rnh_addaddr)((caddr_t)saddr, (caddr_t)smask, rnh,
- np->netc_rnodes);
- if (rn == 0) {
- /*
- * One of the reasons that rnh_addaddr may fail is that
- * the entry already exists. To check for this case, we
- * look up the entry to see if it is there. If so, we
- * do not need to make a new entry but do return success.
- */
- _FREE(np, M_NETADDR);
- rn = (*rnh->rnh_matchaddr)((caddr_t)saddr, rnh);
- if (rn != 0 && (rn->rn_flags & RNF_ROOT) == 0 &&
- ((struct netcred *)rn)->netc_exflags == argp->ex_flags &&
- !bcmp((caddr_t)&((struct netcred *)rn)->netc_anon,
- (caddr_t)&argp->ex_anon, sizeof(struct ucred)))
- return (0);
- return (EPERM);
- }
- np->netc_exflags = argp->ex_flags;
- np->netc_anon = argp->ex_anon;
- np->netc_anon.cr_ref = 1;
- return (0);
-out:
- _FREE(np, M_NETADDR);
- return (error);
}
+#endif
-/* ARGSUSED */
-static int
-vfs_free_netcred(rn, w)
- struct radix_node *rn;
- caddr_t w;
-{
- register struct radix_node_head *rnh = (struct radix_node_head *)w;
- (*rnh->rnh_deladdr)(rn->rn_key, rn->rn_mask, rnh);
- _FREE((caddr_t)rn, M_NETADDR);
- return (0);
-}
+#if CONFIG_TRIGGERS
+
+#define TRIG_DEBUG 0
+
+#if TRIG_DEBUG
+#define TRIG_LOG(...) do { printf("%s: ", __FUNCTION__); printf(__VA_ARGS__); } while (0)
+#else
+#define TRIG_LOG(...)
+#endif
/*
- * Free the net address hash lists that are hanging off the mount points.
+ * Resolver result functions
*/
-static void
-vfs_free_addrlist(nep)
- struct netexport *nep;
+
+resolver_result_t
+vfs_resolver_result(uint32_t seq, enum resolver_status stat, int aux)
+{
+ /*
+ * |<--- 32 --->|<--- 28 --->|<- 4 ->|
+ * sequence auxiliary status
+ */
+ return (((uint64_t)seq) << 32) |
+ (((uint64_t)(aux & 0x0fffffff)) << 4) |
+ (uint64_t)(stat & 0x0000000F);
+}
+
+enum resolver_status
+vfs_resolver_status(resolver_result_t result)
{
- register int i;
- register struct radix_node_head *rnh;
+ /* lower 4 bits is status */
+ return (result & 0x0000000F);
+}
- for (i = 0; i <= AF_MAX; i++)
- if (rnh = nep->ne_rtable[i]) {
- (*rnh->rnh_walktree)(rnh, vfs_free_netcred,
- (caddr_t)rnh);
- _FREE((caddr_t)rnh, M_RTABLE);
- nep->ne_rtable[i] = 0;
- }
+uint32_t
+vfs_resolver_sequence(resolver_result_t result)
+{
+ /* upper 32 bits is sequence */
+ return (uint32_t)(result >> 32);
}
int
-vfs_export(mp, nep, argp)
- struct mount *mp;
- struct netexport *nep;
- struct export_args *argp;
+vfs_resolver_auxiliary(resolver_result_t result)
{
- int error;
+ /* 28 bits of auxiliary */
+ return (int)(((uint32_t)(result & 0xFFFFFFF0)) >> 4);
+}
- if (argp->ex_flags & MNT_DELEXPORT) {
- vfs_free_addrlist(nep);
- mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
+/*
+ * SPI
+ * Call in for resolvers to update vnode trigger state
+ */
+int
+vnode_trigger_update(vnode_t vp, resolver_result_t result)
+{
+ vnode_resolve_t rp;
+ uint32_t seq;
+ enum resolver_status stat;
+
+ if (vp->v_resolve == NULL) {
+ return (EINVAL);
}
- if (argp->ex_flags & MNT_EXPORTED) {
- if (error = vfs_hang_addrlist(mp, nep, argp))
- return (error);
- mp->mnt_flag |= MNT_EXPORTED;
+
+ stat = vfs_resolver_status(result);
+ seq = vfs_resolver_sequence(result);
+
+ if ((stat != RESOLVER_RESOLVED) && (stat != RESOLVER_UNRESOLVED)) {
+ return (EINVAL);
}
- return (0);
-}
-struct netcred *
-vfs_export_lookup(mp, nep, nam)
- register struct mount *mp;
- struct netexport *nep;
- struct mbuf *nam;
-{
- register struct netcred *np;
- register struct radix_node_head *rnh;
- struct sockaddr *saddr;
+ rp = vp->v_resolve;
+ lck_mtx_lock(&rp->vr_lock);
- np = NULL;
- if (mp->mnt_flag & MNT_EXPORTED) {
- /*
- * Lookup in the export list first.
- */
- if (nam != NULL) {
- saddr = mtod(nam, struct sockaddr *);
- rnh = nep->ne_rtable[saddr->sa_family];
- if (rnh != NULL) {
- np = (struct netcred *)
- (*rnh->rnh_matchaddr)((caddr_t)saddr,
- rnh);
- if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
- np = NULL;
- }
- }
- /*
- * If no address match, use the default if it exists.
- */
- if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
- np = &nep->ne_defexported;
+ if (seq > rp->vr_lastseq) {
+ if (stat == RESOLVER_RESOLVED)
+ rp->vr_flags |= VNT_RESOLVED;
+ else
+ rp->vr_flags &= ~VNT_RESOLVED;
+
+ rp->vr_lastseq = seq;
}
- return (np);
+
+ lck_mtx_unlock(&rp->vr_lock);
+
+ return (0);
}
-/*
- * try to reclaim vnodes from the memory
- * object cache
- */
static int
-vm_object_cache_reclaim(int count)
+vnode_resolver_attach(vnode_t vp, vnode_resolve_t rp, boolean_t ref)
{
- int cnt;
- void vnode_pager_release_from_cache(int *);
+ int error;
- /* attempt to reclaim vnodes from VM object cache */
- cnt = count;
- vnode_pager_release_from_cache(&cnt);
- return(cnt);
+ vnode_lock_spin(vp);
+ if (vp->v_resolve != NULL) {
+ vnode_unlock(vp);
+ return EINVAL;
+ } else {
+ vp->v_resolve = rp;
+ }
+ vnode_unlock(vp);
+
+ if (ref) {
+ error = vnode_ref_ext(vp, O_EVTONLY, VNODE_REF_FORCE);
+ if (error != 0) {
+ panic("VNODE_REF_FORCE didn't help...");
+ }
+ }
+
+ return 0;
}
/*
- * Release memory object reference held by inactive vnodes
- * and then try to reclaim some vnodes from the memory
- * object cache
+ * VFS internal interfaces for vnode triggers
+ *
+ * vnode must already have an io count on entry
+ * v_resolve is stable when io count is non-zero
*/
static int
-vnreclaim(int count)
+vnode_resolver_create(mount_t mp, vnode_t vp, struct vnode_trigger_param *tinfo, boolean_t external)
{
- int i, loopcnt;
- struct vnode *vp;
- int err;
- struct proc *p;
-
- i = 0;
- loopcnt = 0;
+ vnode_resolve_t rp;
+ int result;
+ char byte;
+
+#if 1
+ /* minimum pointer test (debugging) */
+ if (tinfo->vnt_data)
+ byte = *((char *)tinfo->vnt_data);
+#endif
+ MALLOC(rp, vnode_resolve_t, sizeof(*rp), M_TEMP, M_WAITOK);
+ if (rp == NULL)
+ return (ENOMEM);
+
+ lck_mtx_init(&rp->vr_lock, trigger_vnode_lck_grp, trigger_vnode_lck_attr);
+
+ rp->vr_resolve_func = tinfo->vnt_resolve_func;
+ rp->vr_unresolve_func = tinfo->vnt_unresolve_func;
+ rp->vr_rearm_func = tinfo->vnt_rearm_func;
+ rp->vr_reclaim_func = tinfo->vnt_reclaim_func;
+ rp->vr_data = tinfo->vnt_data;
+ rp->vr_lastseq = 0;
+ rp->vr_flags = tinfo->vnt_flags & VNT_VALID_MASK;
+ if (external) {
+ rp->vr_flags |= VNT_EXTERNAL;
+ }
- /* Try to release "count" vnodes from the inactive list */
-restart:
- if (++loopcnt > inactivevnodes) {
- /*
- * I did my best trying to reclaim the vnodes.
- * Do not try any more as that would only lead to
- * long latencies. Also in the worst case
- * this can get totally CPU bound.
- * Just fall though and attempt a reclaim of VM
- * object cache
- */
+ result = vnode_resolver_attach(vp, rp, external);
+ if (result != 0) {
goto out;
}
- simple_lock(&vnode_free_list_slock);
- for (vp = TAILQ_FIRST(&vnode_inactive_list);
- (vp != NULLVP) && (i < count);
- vp = TAILQ_NEXT(vp, v_freelist)) {
-
- if (!simple_lock_try(&vp->v_interlock))
- continue;
-
- if (vp->v_usecount != 1)
- panic("vnreclaim: v_usecount");
-
- if(!UBCINFOEXISTS(vp)) {
- if (vp->v_type == VBAD) {
- VREMINACTIVE("vnreclaim", vp);
- simple_unlock(&vp->v_interlock);
- continue;
- } else
- panic("non UBC vnode on inactive list");
- /* Should not reach here */
- }
+ if (mp) {
+ OSAddAtomic(1, &mp->mnt_numtriggers);
+ }
- /* If vnode is already being reclaimed, wait */
- if ((vp->v_flag & VXLOCK) || (vp->v_flag & VORECLAIM)) {
- vp->v_flag |= VXWANT;
- simple_unlock(&vp->v_interlock);
- simple_unlock(&vnode_free_list_slock);
- (void)tsleep((caddr_t)vp, PINOD, "vocr", 0);
- goto restart;
- }
+ return (result);
- VREMINACTIVE("vnreclaim", vp);
- simple_unlock(&vnode_free_list_slock);
+out:
+ FREE(rp, M_TEMP);
+ return result;
+}
- if (ubc_issetflags(vp, UI_WASMAPPED)) {
- /*
- * We should not reclaim as it is likely
- * to be in use. Let it die a natural death.
- * Release the UBC reference if one exists
- * and put it back at the tail.
- */
- simple_unlock(&vp->v_interlock);
- if (ubc_release_named(vp)) {
- if (UBCINFOEXISTS(vp)) {
- simple_lock(&vp->v_interlock);
- if (vp->v_usecount == 1 && !VONLIST(vp))
- vinactive(vp);
- simple_unlock(&vp->v_interlock);
- }
- } else {
- simple_lock(&vp->v_interlock);
- vinactive(vp);
- simple_unlock(&vp->v_interlock);
- }
- } else {
- int didhold;
+static void
+vnode_resolver_release(vnode_resolve_t rp)
+{
+ /*
+ * Give them a chance to free any private data
+ */
+ if (rp->vr_data && rp->vr_reclaim_func) {
+ rp->vr_reclaim_func(NULLVP, rp->vr_data);
+ }
- VORECLAIM_ENABLE(vp);
+ lck_mtx_destroy(&rp->vr_lock, trigger_vnode_lck_grp);
+ FREE(rp, M_TEMP);
- /*
- * scrub the dirty pages and invalidate the buffers
- */
- p = current_proc();
- err = vn_lock(vp, LK_EXCLUSIVE|LK_INTERLOCK, p);
- if (err) {
- /* cannot reclaim */
- simple_lock(&vp->v_interlock);
- vinactive(vp);
- VORECLAIM_DISABLE(vp);
- i++;
- simple_unlock(&vp->v_interlock);
- goto restart;
- }
-
- /* keep the vnode alive so we can kill it */
- simple_lock(&vp->v_interlock);
- if(vp->v_usecount != 1)
- panic("VOCR: usecount race");
- vp->v_usecount++;
- simple_unlock(&vp->v_interlock);
-
- /* clean up the state in VM without invalidating */
- didhold = ubc_hold(vp);
- if (didhold)
- (void)ubc_clean(vp, 0);
-
- /* flush and invalidate buffers associated with the vnode */
- if (vp->v_tag == VT_NFS)
- nfs_vinvalbuf(vp, V_SAVE, NOCRED, p, 0);
- else
- vinvalbuf(vp, V_SAVE, NOCRED, p, 0, 0);
+}
- /*
- * Note: for the v_usecount == 2 case, VOP_INACTIVE
- * has not yet been called. Call it now while vp is
- * still locked, it will also release the lock.
- */
- if (vp->v_usecount == 2)
- VOP_INACTIVE(vp, p);
- else
- VOP_UNLOCK(vp, 0, p);
+/* Called after the vnode has been drained */
+static void
+vnode_resolver_detach(vnode_t vp)
+{
+ vnode_resolve_t rp;
+ mount_t mp;
- if (didhold)
- ubc_rele(vp);
+ mp = vnode_mount(vp);
- /*
- * destroy the ubc named reference.
- * If we can't because it is held for I/Os
- * in progress, just put it back on the inactive
- * list and move on. Otherwise, the paging reference
- * is toast (and so is this vnode?).
- */
- if (ubc_destroy_named(vp)) {
- i++;
- }
- simple_lock(&vp->v_interlock);
- VORECLAIM_DISABLE(vp);
- simple_unlock(&vp->v_interlock);
- vrele(vp); /* release extra use we added here */
- }
- /* inactive list lock was released, must restart */
- goto restart;
- }
- simple_unlock(&vnode_free_list_slock);
+ vnode_lock(vp);
+ rp = vp->v_resolve;
+ vp->v_resolve = NULL;
+ vnode_unlock(vp);
- vnode_reclaim_tried += i;
-out:
- i = vm_object_cache_reclaim(count);
- vnode_objects_reclaimed += i;
+ if ((rp->vr_flags & VNT_EXTERNAL) != 0) {
+ vnode_rele_ext(vp, O_EVTONLY, 1);
+ }
- return(i);
+ vnode_resolver_release(rp);
+
+ /* Keep count of active trigger vnodes per mount */
+ OSAddAtomic(-1, &mp->mnt_numtriggers);
}
-/*
- * This routine is called from vnode_pager_no_senders()
- * which in turn can be called with vnode locked by vnode_uncache()
- * But it could also get called as a result of vm_object_cache_trim().
- * In that case lock state is unknown.
- * AGE the vnode so that it gets recycled quickly.
- * Check lock status to decide whether to call vput() or vrele().
+/*
+ * Pathname operations that don't trigger a mount for trigger vnodes
*/
-__private_extern__ void
-vnode_pager_vrele(struct vnode *vp)
-{
+static const u_int64_t ignorable_pathops_mask =
+ 1LL << OP_MOUNT |
+ 1LL << OP_UNMOUNT |
+ 1LL << OP_STATFS |
+ 1LL << OP_ACCESS |
+ 1LL << OP_GETATTR |
+ 1LL << OP_LISTXATTR;
- boolean_t funnel_state;
- int isvnreclaim = 1;
-
- if (vp == (struct vnode *) NULL)
- panic("vnode_pager_vrele: null vp");
+int
+vfs_istraditionaltrigger(enum path_operation op, const struct componentname *cnp)
+{
+ if (cnp->cn_flags & ISLASTCN)
+ return ((1LL << op) & ignorable_pathops_mask) == 0;
+ else
+ return (1);
+}
- funnel_state = thread_funnel_set(kernel_flock, TRUE);
+__private_extern__
+void
+vnode_trigger_rearm(vnode_t vp, vfs_context_t ctx)
+{
+ vnode_resolve_t rp;
+ resolver_result_t result;
+ enum resolver_status status;
+ uint32_t seq;
+
+ if ((vp->v_resolve == NULL) ||
+ (vp->v_resolve->vr_rearm_func == NULL) ||
+ (vp->v_resolve->vr_flags & VNT_AUTO_REARM) == 0) {
+ return;
+ }
- /* Mark the vnode to be recycled */
- vagevp(vp);
+ rp = vp->v_resolve;
+ lck_mtx_lock(&rp->vr_lock);
- simple_lock(&vp->v_interlock);
/*
- * If a vgone (or vclean) is already in progress,
- * Do not bother with the ubc_info cleanup.
- * Let the vclean deal with it.
+ * Check if VFS initiated this unmount. If so, we'll catch it after the unresolve completes.
*/
- if (vp->v_flag & VXLOCK) {
- CLR(vp->v_flag, VTERMINATE);
- if (ISSET(vp->v_flag, VTERMWANT)) {
- CLR(vp->v_flag, VTERMWANT);
- wakeup((caddr_t)&vp->v_ubcinfo);
- }
- simple_unlock(&vp->v_interlock);
- vrele(vp);
- (void) thread_funnel_set(kernel_flock, funnel_state);
+ if (rp->vr_flags & VNT_VFS_UNMOUNTED) {
+ lck_mtx_unlock(&rp->vr_lock);
return;
}
- /* It's dead, Jim! */
- if (!ISSET(vp->v_flag, VORECLAIM)) {
- /*
- * called as a result of eviction of the memory
- * object from the memory object cache
- */
- isvnreclaim = 0;
-
- /* So serialize vnode operations */
- VORECLAIM_ENABLE(vp);
+ /* Check if this vnode is already armed */
+ if ((rp->vr_flags & VNT_RESOLVED) == 0) {
+ lck_mtx_unlock(&rp->vr_lock);
+ return;
}
- if (!ISSET(vp->v_flag, VTERMINATE))
- SET(vp->v_flag, VTERMINATE);
- if (UBCINFOEXISTS(vp)) {
- struct ubc_info *uip = vp->v_ubcinfo;
- if (ubc_issetflags(vp, UI_WASMAPPED))
- SET(vp->v_flag, VWASMAPPED);
+ lck_mtx_unlock(&rp->vr_lock);
- vp->v_ubcinfo = UBC_NOINFO; /* catch bad accesses */
- simple_unlock(&vp->v_interlock);
- ubc_info_deallocate(uip);
- } else {
- if ((vp->v_type == VBAD) && ((vp)->v_ubcinfo != UBC_INFO_NULL)
- && ((vp)->v_ubcinfo != UBC_NOINFO)) {
- struct ubc_info *uip = vp->v_ubcinfo;
+ result = rp->vr_rearm_func(vp, 0, rp->vr_data, ctx);
+ status = vfs_resolver_status(result);
+ seq = vfs_resolver_sequence(result);
- vp->v_ubcinfo = UBC_NOINFO; /* catch bad accesses */
- simple_unlock(&vp->v_interlock);
- ubc_info_deallocate(uip);
- } else {
- simple_unlock(&vp->v_interlock);
- }
+ lck_mtx_lock(&rp->vr_lock);
+ if (seq > rp->vr_lastseq) {
+ if (status == RESOLVER_UNRESOLVED)
+ rp->vr_flags &= ~VNT_RESOLVED;
+ rp->vr_lastseq = seq;
}
+ lck_mtx_unlock(&rp->vr_lock);
+}
- CLR(vp->v_flag, VTERMINATE);
+__private_extern__
+int
+vnode_trigger_resolve(vnode_t vp, struct nameidata *ndp, vfs_context_t ctx)
+{
+ vnode_resolve_t rp;
+ enum path_operation op;
+ resolver_result_t result;
+ enum resolver_status status;
+ uint32_t seq;
+
+ /* Only trigger on topmost vnodes */
+ if ((vp->v_resolve == NULL) ||
+ (vp->v_resolve->vr_resolve_func == NULL) ||
+ (vp->v_mountedhere != NULL)) {
+ return (0);
+ }
- if (vp->v_type != VBAD){
- vgone(vp); /* revoke the vnode */
- vrele(vp); /* and drop the reference */
- } else
- vrele(vp);
+ rp = vp->v_resolve;
+ lck_mtx_lock(&rp->vr_lock);
- if (ISSET(vp->v_flag, VTERMWANT)) {
- CLR(vp->v_flag, VTERMWANT);
- wakeup((caddr_t)&vp->v_ubcinfo);
+ /* Check if this vnode is already resolved */
+ if (rp->vr_flags & VNT_RESOLVED) {
+ lck_mtx_unlock(&rp->vr_lock);
+ return (0);
}
- if (!isvnreclaim)
- VORECLAIM_DISABLE(vp);
- (void) thread_funnel_set(kernel_flock, funnel_state);
- return;
-}
+ lck_mtx_unlock(&rp->vr_lock);
-#if DIAGNOSTIC
-int walk_vnodes_debug=0;
+ /*
+ * XXX
+ * assumes that resolver will not access this trigger vnode (otherwise the kernel will deadlock)
+ * is there anyway to know this???
+ * there can also be other legitimate lookups in parallel
+ *
+ * XXX - should we call this on a separate thread with a timeout?
+ *
+ * XXX - should we use ISLASTCN to pick the op value??? Perhaps only leafs should
+ * get the richer set and non-leafs should get generic OP_LOOKUP? TBD
+ */
+ op = (ndp->ni_op < OP_MAXOP) ? ndp->ni_op: OP_LOOKUP;
-void
-walk_allvnodes()
+ result = rp->vr_resolve_func(vp, &ndp->ni_cnd, op, 0, rp->vr_data, ctx);
+ status = vfs_resolver_status(result);
+ seq = vfs_resolver_sequence(result);
+
+ lck_mtx_lock(&rp->vr_lock);
+ if (seq > rp->vr_lastseq) {
+ if (status == RESOLVER_RESOLVED)
+ rp->vr_flags |= VNT_RESOLVED;
+ rp->vr_lastseq = seq;
+ }
+ lck_mtx_unlock(&rp->vr_lock);
+
+ /* On resolver errors, propagate the error back up */
+ return (status == RESOLVER_ERROR ? vfs_resolver_auxiliary(result) : 0);
+}
+
+static int
+vnode_trigger_unresolve(vnode_t vp, int flags, vfs_context_t ctx)
{
- struct mount *mp, *nmp;
- struct vnode *vp;
- int cnt = 0;
-
- for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
- for (vp = mp->mnt_vnodelist.lh_first;
- vp != NULL;
- vp = vp->v_mntvnodes.le_next) {
- if (vp->v_usecount < 0){
- if(walk_vnodes_debug) {
- printf("vp is %x\n",vp);
- }
- }
- }
- nmp = mp->mnt_list.cqe_next;
+ vnode_resolve_t rp;
+ resolver_result_t result;
+ enum resolver_status status;
+ uint32_t seq;
+
+ if ((vp->v_resolve == NULL) || (vp->v_resolve->vr_unresolve_func == NULL)) {
+ return (0);
}
- for (cnt = 0, vp = vnode_free_list.tqh_first;
- vp != NULLVP; cnt++, vp = vp->v_freelist.tqe_next) {
- if ((vp->v_usecount < 0) && walk_vnodes_debug) {
- if(walk_vnodes_debug) {
- printf("vp is %x\n",vp);
- }
- }
+
+ rp = vp->v_resolve;
+ lck_mtx_lock(&rp->vr_lock);
+
+ /* Check if this vnode is already resolved */
+ if ((rp->vr_flags & VNT_RESOLVED) == 0) {
+ printf("vnode_trigger_unresolve: not currently resolved\n");
+ lck_mtx_unlock(&rp->vr_lock);
+ return (0);
}
- printf("%d - free\n", cnt);
- for (cnt = 0, vp = vnode_inactive_list.tqh_first;
- vp != NULLVP; cnt++, vp = vp->v_freelist.tqe_next) {
- if ((vp->v_usecount < 0) && walk_vnodes_debug) {
- if(walk_vnodes_debug) {
- printf("vp is %x\n",vp);
- }
- }
+ rp->vr_flags |= VNT_VFS_UNMOUNTED;
+
+ lck_mtx_unlock(&rp->vr_lock);
+
+ /*
+ * XXX
+ * assumes that resolver will not access this trigger vnode (otherwise the kernel will deadlock)
+ * there can also be other legitimate lookups in parallel
+ *
+ * XXX - should we call this on a separate thread with a timeout?
+ */
+
+ result = rp->vr_unresolve_func(vp, flags, rp->vr_data, ctx);
+ status = vfs_resolver_status(result);
+ seq = vfs_resolver_sequence(result);
+
+ lck_mtx_lock(&rp->vr_lock);
+ if (seq > rp->vr_lastseq) {
+ if (status == RESOLVER_UNRESOLVED)
+ rp->vr_flags &= ~VNT_RESOLVED;
+ rp->vr_lastseq = seq;
}
- printf("%d - inactive\n", cnt);
+ rp->vr_flags &= ~VNT_VFS_UNMOUNTED;
+ lck_mtx_unlock(&rp->vr_lock);
+
+ /* On resolver errors, propagate the error back up */
+ return (status == RESOLVER_ERROR ? vfs_resolver_auxiliary(result) : 0);
}
-#endif /* DIAGNOSTIC */
-void
-vfs_io_attributes(vp, flags, iosize, vectors)
- struct vnode *vp;
- int flags; /* B_READ or B_WRITE */
- int *iosize;
- int *vectors;
+static int
+triggerisdescendant(mount_t mp, mount_t rmp)
{
- struct mount *mp;
+ int match = FALSE;
+
+ /*
+ * walk up vnode covered chain looking for a match
+ */
+ name_cache_lock_shared();
- /* start with "reasonable" defaults */
- *iosize = MAXPHYS;
- *vectors = 32;
+ while (1) {
+ vnode_t vp;
- mp = vp->v_mount;
- if (mp != NULL) {
- switch (flags) {
- case B_READ:
- *iosize = mp->mnt_maxreadcnt;
- *vectors = mp->mnt_segreadcnt;
+ /* did we encounter "/" ? */
+ if (mp->mnt_flag & MNT_ROOTFS)
break;
- case B_WRITE:
- *iosize = mp->mnt_maxwritecnt;
- *vectors = mp->mnt_segwritecnt;
+
+ vp = mp->mnt_vnodecovered;
+ if (vp == NULLVP)
break;
- default:
+
+ mp = vp->v_mount;
+ if (mp == rmp) {
+ match = TRUE;
break;
}
}
- return;
+ name_cache_unlock();
+
+ return (match);
}
-#include <dev/disk.h>
+struct trigger_unmount_info {
+ vfs_context_t ctx;
+ mount_t top_mp;
+ vnode_t trigger_vp;
+ mount_t trigger_mp;
+ uint32_t trigger_vid;
+ int flags;
+};
-int
-vfs_init_io_attributes(devvp, mp)
- struct vnode *devvp;
- struct mount *mp;
+static int
+trigger_unmount_callback(mount_t mp, void * arg)
{
- int error;
- off_t readblockcnt;
- off_t writeblockcnt;
- off_t readsegcnt;
- off_t writesegcnt;
- u_long blksize;
+ struct trigger_unmount_info * infop = (struct trigger_unmount_info *)arg;
+ boolean_t mountedtrigger = FALSE;
- u_int64_t temp;
+ /*
+ * When we encounter the top level mount we're done
+ */
+ if (mp == infop->top_mp)
+ return (VFS_RETURNED_DONE);
- struct proc *p = current_proc();
- struct ucred *cred = p->p_ucred;
+ if ((mp->mnt_vnodecovered == NULL) ||
+ (vnode_getwithref(mp->mnt_vnodecovered) != 0)) {
+ return (VFS_RETURNED);
+ }
- if ((error = VOP_IOCTL(devvp, DKIOCGETMAXBLOCKCOUNTREAD,
- (caddr_t)&readblockcnt, 0, cred, p)))
- return (error);
+ if ((mp->mnt_vnodecovered->v_mountedhere == mp) &&
+ (mp->mnt_vnodecovered->v_resolve != NULL) &&
+ (mp->mnt_vnodecovered->v_resolve->vr_flags & VNT_RESOLVED)) {
+ mountedtrigger = TRUE;
+ }
+ vnode_put(mp->mnt_vnodecovered);
- if ((error = VOP_IOCTL(devvp, DKIOCGETMAXBLOCKCOUNTWRITE,
- (caddr_t)&writeblockcnt, 0, cred, p)))
- return (error);
+ /*
+ * When we encounter a mounted trigger, check if its under the top level mount
+ */
+ if ( !mountedtrigger || !triggerisdescendant(mp, infop->top_mp) )
+ return (VFS_RETURNED);
- if ((error = VOP_IOCTL(devvp, DKIOCGETMAXSEGMENTCOUNTREAD,
- (caddr_t)&readsegcnt, 0, cred, p)))
- return (error);
+ /*
+ * Process any pending nested mount (now that its not referenced)
+ */
+ if ((infop->trigger_vp != NULLVP) &&
+ (vnode_getwithvid(infop->trigger_vp, infop->trigger_vid) == 0)) {
+ vnode_t vp = infop->trigger_vp;
+ int error;
- if ((error = VOP_IOCTL(devvp, DKIOCGETMAXSEGMENTCOUNTWRITE,
- (caddr_t)&writesegcnt, 0, cred, p)))
- return (error);
+ infop->trigger_vp = NULLVP;
+
+ if (mp == vp->v_mountedhere) {
+ vnode_put(vp);
+ printf("trigger_unmount_callback: unexpected match '%s'\n",
+ mp->mnt_vfsstat.f_mntonname);
+ return (VFS_RETURNED);
+ }
+ if (infop->trigger_mp != vp->v_mountedhere) {
+ vnode_put(vp);
+ printf("trigger_unmount_callback: trigger mnt changed! (%p != %p)\n",
+ infop->trigger_mp, vp->v_mountedhere);
+ goto savenext;
+ }
- if ((error = VOP_IOCTL(devvp, DKIOCGETBLOCKSIZE,
- (caddr_t)&blksize, 0, cred, p)))
- return (error);
+ error = vnode_trigger_unresolve(vp, infop->flags, infop->ctx);
+ vnode_put(vp);
+ if (error) {
+ printf("unresolving: '%s', err %d\n",
+ vp->v_mountedhere ? vp->v_mountedhere->mnt_vfsstat.f_mntonname :
+ "???", error);
+ return (VFS_RETURNED_DONE); /* stop iteration on errors */
+ }
+ }
+savenext:
+ /*
+ * We can't call resolver here since we hold a mount iter
+ * ref on mp so save its covered vp for later processing
+ */
+ infop->trigger_vp = mp->mnt_vnodecovered;
+ if ((infop->trigger_vp != NULLVP) &&
+ (vnode_getwithref(infop->trigger_vp) == 0)) {
+ if (infop->trigger_vp->v_mountedhere == mp) {
+ infop->trigger_vid = infop->trigger_vp->v_id;
+ infop->trigger_mp = mp;
+ }
+ vnode_put(infop->trigger_vp);
+ }
- temp = readblockcnt * blksize;
- temp = (temp > UINT32_MAX) ? (UINT32_MAX / blksize) * blksize : temp;
- mp->mnt_maxreadcnt = (u_int32_t)temp;
+ return (VFS_RETURNED);
+}
- temp = writeblockcnt * blksize;
- temp = (temp > UINT32_MAX) ? (UINT32_MAX / blksize) * blksize : temp;
- mp->mnt_maxwritecnt = (u_int32_t)temp;
+/*
+ * Attempt to unmount any trigger mounts nested underneath a mount.
+ * This is a best effort attempt and no retries are performed here.
+ *
+ * Note: mp->mnt_rwlock is held exclusively on entry (so be carefull)
+ */
+__private_extern__
+void
+vfs_nested_trigger_unmounts(mount_t mp, int flags, vfs_context_t ctx)
+{
+ struct trigger_unmount_info info;
- temp = (readsegcnt > UINT16_MAX) ? UINT16_MAX : readsegcnt;
- mp->mnt_segreadcnt = (u_int16_t)temp;
+ /* Must have trigger vnodes */
+ if (mp->mnt_numtriggers == 0) {
+ return;
+ }
+ /* Avoid recursive requests (by checking covered vnode) */
+ if ((mp->mnt_vnodecovered != NULL) &&
+ (vnode_getwithref(mp->mnt_vnodecovered) == 0)) {
+ boolean_t recursive = FALSE;
+
+ if ((mp->mnt_vnodecovered->v_mountedhere == mp) &&
+ (mp->mnt_vnodecovered->v_resolve != NULL) &&
+ (mp->mnt_vnodecovered->v_resolve->vr_flags & VNT_VFS_UNMOUNTED)) {
+ recursive = TRUE;
+ }
+ vnode_put(mp->mnt_vnodecovered);
+ if (recursive)
+ return;
+ }
- temp = (writesegcnt > UINT16_MAX) ? UINT16_MAX : writesegcnt;
- mp->mnt_segwritecnt = (u_int16_t)temp;
+ /*
+ * Attempt to unmount any nested trigger mounts (best effort)
+ */
+ info.ctx = ctx;
+ info.top_mp = mp;
+ info.trigger_vp = NULLVP;
+ info.trigger_vid = 0;
+ info.trigger_mp = NULL;
+ info.flags = flags;
-#if 0
- printf("--- IO attributes for mount point 0x%08x ---\n", mp);
- printf("\tmnt_maxreadcnt = 0x%x", mp->mnt_maxreadcnt);
- printf("\tmnt_maxwritecnt = 0x%x\n", mp->mnt_maxwritecnt);
- printf("\tmnt_segreadcnt = 0x%x", mp->mnt_segreadcnt);
- printf("\tmnt_segwritecnt = 0x%x\n", mp->mnt_segwritecnt);
-#endif /* 0 */
+ (void) vfs_iterate(VFS_ITERATE_TAIL_FIRST, trigger_unmount_callback, &info);
- return (error);
+ /*
+ * Process remaining nested mount (now that its not referenced)
+ */
+ if ((info.trigger_vp != NULLVP) &&
+ (vnode_getwithvid(info.trigger_vp, info.trigger_vid) == 0)) {
+ vnode_t vp = info.trigger_vp;
+
+ if (info.trigger_mp == vp->v_mountedhere) {
+ (void) vnode_trigger_unresolve(vp, flags, ctx);
+ }
+ vnode_put(vp);
+ }
+}
+
+int
+vfs_addtrigger(mount_t mp, const char *relpath, struct vnode_trigger_info *vtip, vfs_context_t ctx)
+{
+ struct nameidata nd;
+ int res;
+ vnode_t rvp, vp;
+ struct vnode_trigger_param vtp;
+
+ /*
+ * Must be called for trigger callback, wherein rwlock is held
+ */
+ lck_rw_assert(&mp->mnt_rwlock, LCK_RW_ASSERT_HELD);
+
+ TRIG_LOG("Adding trigger at %s\n", relpath);
+ TRIG_LOG("Trying VFS_ROOT\n");
+
+ /*
+ * We do a lookup starting at the root of the mountpoint, unwilling
+ * to cross into other mountpoints.
+ */
+ res = VFS_ROOT(mp, &rvp, ctx);
+ if (res != 0) {
+ goto out;
+ }
+
+ TRIG_LOG("Trying namei\n");
+
+ NDINIT(&nd, LOOKUP, OP_LOOKUP, USEDVP | NOCROSSMOUNT | FOLLOW, UIO_SYSSPACE,
+ CAST_USER_ADDR_T(relpath), ctx);
+ nd.ni_dvp = rvp;
+ res = namei(&nd);
+ if (res != 0) {
+ vnode_put(rvp);
+ goto out;
+ }
+
+ vp = nd.ni_vp;
+ nameidone(&nd);
+ vnode_put(rvp);
+
+ TRIG_LOG("Trying vnode_resolver_create()\n");
+
+ /*
+ * Set up blob. vnode_create() takes a larger structure
+ * with creation info, and we needed something different
+ * for this case. One needs to win, or we need to munge both;
+ * vnode_create() wins.
+ */
+ bzero(&vtp, sizeof(vtp));
+ vtp.vnt_resolve_func = vtip->vti_resolve_func;
+ vtp.vnt_unresolve_func = vtip->vti_unresolve_func;
+ vtp.vnt_rearm_func = vtip->vti_rearm_func;
+ vtp.vnt_reclaim_func = vtip->vti_reclaim_func;
+ vtp.vnt_reclaim_func = vtip->vti_reclaim_func;
+ vtp.vnt_data = vtip->vti_data;
+ vtp.vnt_flags = vtip->vti_flags;
+
+ res = vnode_resolver_create(mp, vp, &vtp, TRUE);
+ vnode_put(vp);
+out:
+ TRIG_LOG("Returning %d\n", res);
+ return res;
}
+#endif /* CONFIG_TRIGGERS */
projects / apple / xnu.git / blobdiff