X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/9bccf70c0258c7cac2dcb80011b2a964d884c552..ebb1b9f42b62218f29061826217bb0f71cd375a6:/bsd/vfs/vfs_subr.c diff --git a/bsd/vfs/vfs_subr.c b/bsd/vfs/vfs_subr.c index c49f321c2..4280f3bfd 100644 --- a/bsd/vfs/vfs_subr.c +++ b/bsd/vfs/vfs_subr.c @@ -1,23 +1,29 @@ /* - * 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 */ /* @@ -59,32 +65,52 @@ * * @(#)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 #include -#include -#include +#include +#include +#include #include +#include #include +#include #include #include #include -#include +#include #include #include +#include +#include #include #include #include -#include +#include #include #include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + #include @@ -92,7 +118,32 @@ #include #include +#include + +#include /* kalloc()/kfree() */ +#include /* delay_for_interval() */ +#include /* OSAddAtomic() */ + + +#ifdef JOE_DEBUG +#include +#endif + +#include /* vnode_pager_vrele() */ + +#if CONFIG_MACF +#include +#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, @@ -103,32 +154,93 @@ int vttoif_tab[9] = { 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 */ +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) \ @@ -149,52 +261,39 @@ struct mntlist mountlist; /* mounted filesystem list */ 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 */ /* @@ -203,43 +302,28 @@ unsigned long vnodetarget; /* target for vnreclaim() */ * 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 @@ -254,6 +338,10 @@ reset_vmobjectcache(unsigned int val1, unsigned int val2) 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 @@ -262,2436 +350,8101 @@ reset_vmobjectcache(unsigned int val1, unsigned int val2) 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 + +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; + } + + /***** *****/ +#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 + /***** *****/ + + /***** *****/ + 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; + } + /***** *****/ + + /***** *****/ + + 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; + } + + /***** *****/ + + /* 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 : "", 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 +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 */