/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 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@
*/
/*
*
* devfs_tree.c
*/
+/*
+ * 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.
+ */
/*
* HISTORY
#include <sys/malloc.h>
#include <sys/mount_internal.h>
#include <sys/proc.h>
-#include <sys/vnode.h>
+#include <sys/vnode_internal.h>
#include <stdarg.h>
-
+#include <libkern/OSAtomic.h>
+#define BSD_KERNEL_PRIVATE 1 /* devfs_make_link() prototype */
#include "devfs.h"
#include "devfsdefs.h"
-static void devfs_release_busy(devnode_t *);
+#if CONFIG_MACF
+#include <security/mac_framework.h>
+#endif
+
+#if FDESC
+#include "fdesc.h"
+#endif
+
+typedef struct devfs_vnode_event {
+ vnode_t dve_vp;
+ uint32_t dve_vid;
+ uint32_t dve_events;
+} *devfs_vnode_event_t;
+
+/*
+ * Size of stack buffer (fast path) for notifications. If
+ * the number of mounts is small, no need to malloc a buffer.
+ */
+#define NUM_STACK_ENTRIES 5
+
+typedef struct devfs_event_log {
+ size_t del_max;
+ size_t del_used;
+ devfs_vnode_event_t del_entries;
+} *devfs_event_log_t;
+
+
static void dev_free_hier(devdirent_t *);
-static int devfs_propogate(devdirent_t *, devdirent_t *);
-static int dev_finddir(char *, devnode_t *, int, devnode_t **);
+static int devfs_propogate(devdirent_t *, devdirent_t *, devfs_event_log_t);
+static int dev_finddir(const char *, devnode_t *, int, devnode_t **, devfs_event_log_t);
static int dev_dup_entry(devnode_t *, devdirent_t *, devdirent_t **, struct devfsmount *);
+void devfs_ref_node(devnode_t *);
+void devfs_rele_node(devnode_t *);
+static void devfs_record_event(devfs_event_log_t, devnode_t*, uint32_t);
+static int devfs_init_event_log(devfs_event_log_t, uint32_t, devfs_vnode_event_t);
+static void devfs_release_event_log(devfs_event_log_t, int);
+static void devfs_bulk_notify(devfs_event_log_t);
+static devdirent_t *devfs_make_node_internal(dev_t, devfstype_t type, uid_t, gid_t, int,
+ int (*clone)(dev_t dev, int action), const char *fmt, va_list ap);
lck_grp_t * devfs_lck_grp;
devdirent_t * dev_root = NULL; /* root of backing tree */
struct devfs_stats devfs_stats; /* hold stats */
+static ino_t devfs_unique_fileno = 0;
+
#ifdef HIDDEN_MOUNTPOINT
static struct mount *devfs_hidden_mount;
#endif /* HIDDEN_MOINTPOINT */
static int devfs_ready = 0;
+static uint32_t devfs_nmountplanes = 0; /* The first plane is not used for a mount */
-#define NOCREATE FALSE
-#define CREATE TRUE
+#define DEVFS_NOCREATE FALSE
+#define DEVFS_CREATE TRUE
/*
* Set up the root directory node in the backing plane
TAILQ_INIT(&devfs_hidden_mount->mnt_vnodelist);
TAILQ_INIT(&devfs_hidden_mount->mnt_workerqueue);
TAILQ_INIT(&devfs_hidden_mount->mnt_newvnodes);
+#if CONFIG_MACF
+ mac_mount_label_init(devfs_hidden_mount);
+ mac_mount_label_associate(vfs_context_kernel(), devfs_hidden_mount);
+#endif
/* Initialize the default IO constraints */
mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;
+ mp->mnt_ioflags = 0;
+ mp->mnt_realrootvp = NULLVP;
+ mp->mnt_authcache_ttl = CACHED_LOOKUP_RIGHT_TTL;
devfs_mount(devfs_hidden_mount,"dummy",NULL,NULL,NULL);
dev_root->de_dnp->dn_dvm
= (struct devfsmount *)devfs_hidden_mount->mnt_data;
#endif /* HIDDEN_MOUNTPOINT */
+#if CONFIG_MACF
+ mac_devfs_label_associate_directory("/", strlen("/"),
+ dev_root->de_dnp, "/");
+#endif
devfs_ready = 1;
return (0);
}
* called with DEVFS_LOCK held
***************************************************************/
devdirent_t *
-dev_findname(devnode_t * dir, char *name)
+dev_findname(devnode_t * dir, const char *name)
{
devdirent_t * newfp;
if (dir->dn_type != DEV_DIR) return 0;/*XXX*/ /* printf?*/
while(newfp)
{
- if(!(strcmp(name,newfp->de_name)))
+ if(!(strncmp(name, newfp->de_name, sizeof(newfp->de_name))))
return newfp;
newfp = newfp->de_next;
}
/***********************************************************************
* Given a starting node (0 for root) and a pathname, return the node
- * for the end item on the path. It MUST BE A DIRECTORY. If the 'CREATE'
+ * for the end item on the path. It MUST BE A DIRECTORY. If the 'DEVFS_CREATE'
* option is true, then create any missing nodes in the path and create
* and return the final node as well.
* This is used to set up a directory, before making nodes in it..
* called with DEVFS_LOCK held
***********************************************************************/
static int
-dev_finddir(char * path,
+dev_finddir(const char * path,
devnode_t * dirnode,
int create,
- devnode_t * * dn_pp)
+ devnode_t * * dn_pp,
+ devfs_event_log_t delp)
{
devnode_t * dnp = NULL;
int error = 0;
- char * scan;
+ const char * scan;
+#if CONFIG_MACF
+ char fullpath[DEVMAXPATHSIZE];
+#endif
if (!dirnode) /* dirnode == NULL means start at root */
if (strlen(path) > (DEVMAXPATHSIZE - 1))
return ENAMETOOLONG;
+#if CONFIG_MACF
+ strlcpy (fullpath, path, DEVMAXPATHSIZE);
+#endif
scan = path;
while (*scan == '/')
while (1) {
char component[DEVMAXPATHSIZE];
devdirent_t * dirent_p;
- char * start;
+ const char * start;
if (*scan == 0) {
/* we hit the end of the string, we're done */
while (*scan != '/' && *scan)
scan++;
- strncpy(component, start, scan - start);
- component[ scan - start ] = '\0';
+ strlcpy(component, start, scan - start);
if (*scan == '/')
scan++;
if (error)
break;
dnp = dirent_p->de_dnp;
- devfs_propogate(dirnode->dn_typeinfo.Dir.myname, dirent_p);
+#if CONFIG_MACF
+ mac_devfs_label_associate_directory(
+ dirnode->dn_typeinfo.Dir.myname->de_name,
+ strlen(dirnode->dn_typeinfo.Dir.myname->de_name),
+ dnp, fullpath);
+#endif
+ devfs_propogate(dirnode->dn_typeinfo.Dir.myname, dirent_p, delp);
}
dirnode = dnp; /* continue relative to this directory */
}
* called with DEVFS_LOCK held
***********************************************************************/
int
-dev_add_name(char * name, devnode_t * dirnode, __unused devdirent_t * back,
+dev_add_name(const char * name, devnode_t * dirnode, __unused devdirent_t * back,
devnode_t * dnp, devdirent_t * *dirent_pp)
{
devdirent_t * dirent_p = NULL;
/*
* put the name into the directory entry.
*/
- strcpy(dirent_p->de_name, name);
+ strlcpy(dirent_p->de_name, name, DEVMAXNAMESIZE);
/*
* reused. (Is a DIR, or we select SPLIT_DEVS at compile time)
* typeinfo gives us info to make our node if we don't have a prototype.
* If typeinfo is null and proto exists, then the typeinfo field of
- * the proto is used intead in the CREATE case.
+ * the proto is used intead in the DEVFS_CREATE case.
* note the 'links' count is 0 (except if a dir)
* but it is only cleared on a transition
* so this is ok till we link it to something
*(dnp->dn_prevsiblingp) = dnp;
dnp->dn_nextsibling = proto;
proto->dn_prevsiblingp = &(dnp->dn_nextsibling);
+#if CONFIG_MACF
+ mac_devfs_label_init(dnp);
+ mac_devfs_label_copy(proto->dn_label, dnp->dn_label);
+#endif
} else {
struct timeval tv;
dnp->dn_atime.tv_sec = tv.tv_sec;
dnp->dn_mtime.tv_sec = tv.tv_sec;
dnp->dn_ctime.tv_sec = tv.tv_sec;
+#if CONFIG_MACF
+ mac_devfs_label_init(dnp);
+#endif
}
dnp->dn_dvm = dvm;
+ dnp->dn_refcount = 0;
+ dnp->dn_ino = devfs_unique_fileno;
+ devfs_unique_fileno++;
/*
* fill out the dev node according to type
FREE(dnp,M_DEVFSNODE);
return ENOMEM;
}
- strncpy(dnp->dn_typeinfo.Slnk.name, typeinfo->Slnk.name,
- typeinfo->Slnk.namelen);
- dnp->dn_typeinfo.Slnk.name[typeinfo->Slnk.namelen] = '\0';
+ strlcpy(dnp->dn_typeinfo.Slnk.name, typeinfo->Slnk.name,
+ typeinfo->Slnk.namelen + 1);
dnp->dn_typeinfo.Slnk.namelen = typeinfo->Slnk.namelen;
DEVFS_INCR_STRINGSPACE(dnp->dn_typeinfo.Slnk.namelen + 1);
dnp->dn_ops = &devfs_vnodeop_p;
dnp->dn_ops = &devfs_spec_vnodeop_p;
dnp->dn_typeinfo.dev = typeinfo->dev;
break;
+
+ #if FDESC
+ /* /dev/fd is special */
+ case DEV_DEVFD:
+ dnp->dn_ops = &devfs_devfd_vnodeop_p;
+ dnp->dn_mode |= 0555; /* default perms */
+ break;
+
+ #endif /* FDESC */
default:
return EINVAL;
}
void
devnode_free(devnode_t * dnp)
{
- if (dnp->dn_lflags & DN_BUSY) {
- dnp->dn_lflags |= DN_DELETE;
- return;
- }
+#if CONFIG_MACF
+ mac_devfs_label_destroy(dnp);
+#endif
if (dnp->dn_type == DEV_SLNK) {
DEVFS_DECR_STRINGSPACE(dnp->dn_typeinfo.Slnk.namelen + 1);
FREE(dnp->dn_typeinfo.Slnk.name, M_DEVFSNODE);
dnp->dn_nextsibling->dn_prevsiblingp = prevp;
}
- if (dnp->dn_vn == NULL) {
- devnode_free(dnp); /* no accesses/references */
+
+ /* Can only free if there are no references; otherwise, wait for last vnode to be reclaimed */
+ if (dnp->dn_refcount == 0) {
+ devnode_free(dnp);
}
else {
- dnp->dn_delete = TRUE;
+ dnp->dn_lflags |= DN_DELETE;
}
}
}
* called with DEVFS_LOCK held
***********************************************************************/
static int
-devfs_propogate(devdirent_t * parent,devdirent_t * child)
+devfs_propogate(devdirent_t * parent,devdirent_t * child, devfs_event_log_t delp)
{
int error;
devdirent_t * newnmp;
devnode_t * pdnp = parent->de_dnp;
devnode_t * adnp = parent->de_dnp;
int type = child->de_dnp->dn_type;
+ uint32_t events;
+
+ events = (dnp->dn_type == DEV_DIR ? VNODE_EVENT_DIR_CREATED : VNODE_EVENT_FILE_CREATED);
+ if (delp != NULL) {
+ devfs_record_event(delp, pdnp, events);
+ }
/***********************************************
* Find the other instances of the parent node
NULL, dnp, adnp->dn_dvm,
&newnmp)) != 0) {
printf("duplicating %s failed\n",child->de_name);
+ } else {
+ if (delp != NULL) {
+ devfs_record_event(delp, adnp, events);
+
+ /*
+ * Slightly subtle. We're guaranteed that there will
+ * only be a vnode hooked into this devnode if we're creating
+ * a new link to an existing node; otherwise, the devnode is new
+ * and no one can have looked it up yet. If we're making a link,
+ * then the buffer is large enough for two nodes in each
+ * plane; otherwise, there's no vnode and this call will
+ * do nothing.
+ */
+ devfs_record_event(delp, newnmp->de_dnp, VNODE_EVENT_LINK);
+ }
}
}
return 0; /* for now always succeed */
}
+static uint32_t
+remove_notify_count(devnode_t *dnp)
+{
+ uint32_t notify_count = 0;
+ devnode_t *dnp2;
+
+ /*
+ * Could need to notify for one removed node on each mount and
+ * one parent for each such node.
+ */
+ notify_count = devfs_nmountplanes;
+ notify_count += dnp->dn_links;
+ for (dnp2 = dnp->dn_nextsibling; dnp2 != dnp; dnp2 = dnp2->dn_nextsibling) {
+ notify_count += dnp2->dn_links;
+ }
+
+ return notify_count;
+
+}
/***********************************************************************
* remove all instances of this devicename [for backing nodes..]
devnode_t * dnp = ((devdirent_t *)dirent_p)->de_dnp;
devnode_t * dnp2;
boolean_t lastlink;
-
+ struct devfs_event_log event_log;
+ uint32_t log_count = 0;
+ int do_notify = 0;
+ int need_free = 0;
+ struct devfs_vnode_event stackbuf[NUM_STACK_ENTRIES];
+
DEVFS_LOCK();
if (!devfs_ready) {
goto out;
}
+ log_count = remove_notify_count(dnp);
+
+ if (log_count > NUM_STACK_ENTRIES) {
+ uint32_t new_count;
+wrongsize:
+ DEVFS_UNLOCK();
+ if (devfs_init_event_log(&event_log, log_count, NULL) == 0) {
+ do_notify = 1;
+ need_free = 1;
+ }
+ DEVFS_LOCK();
+
+ new_count = remove_notify_count(dnp);
+ if (need_free && (new_count > log_count)) {
+ devfs_release_event_log(&event_log, 1);
+ need_free = 0;
+ do_notify = 0;
+ log_count = log_count * 2;
+ goto wrongsize;
+ }
+ } else {
+ if (devfs_init_event_log(&event_log, NUM_STACK_ENTRIES, &stackbuf[0]) == 0) {
+ do_notify = 1;
+ }
+ }
+
+ /* This file has been deleted */
+ if (do_notify != 0) {
+ devfs_record_event(&event_log, dnp, VNODE_EVENT_DELETE);
+ }
+
/* keep removing the next sibling till only we exist. */
while ((dnp2 = dnp->dn_nextsibling) != dnp) {
dnp->dn_nextsibling->dn_prevsiblingp = &(dnp->dn_nextsibling);
dnp2->dn_nextsibling = dnp2;
dnp2->dn_prevsiblingp = &(dnp2->dn_nextsibling);
+
+ /* This file has been deleted in this plane */
+ if (do_notify != 0) {
+ devfs_record_event(&event_log, dnp2, VNODE_EVENT_DELETE);
+ }
+
if (dnp2->dn_linklist) {
do {
lastlink = (1 == dnp2->dn_links);
+ /* Each parent of a link to this file has lost a child in this plane */
+ if (do_notify != 0) {
+ devfs_record_event(&event_log, dnp2->dn_linklist->de_parent, VNODE_EVENT_FILE_REMOVED);
+ }
dev_free_name(dnp2->dn_linklist);
} while (!lastlink);
}
if (dnp->dn_linklist) {
do {
lastlink = (1 == dnp->dn_links);
+ /* Each parent of a link to this file has lost a child */
+ if (do_notify != 0) {
+ devfs_record_event(&event_log, dnp->dn_linklist->de_parent, VNODE_EVENT_FILE_REMOVED);
+ }
dev_free_name(dnp->dn_linklist);
} while (!lastlink);
}
out:
DEVFS_UNLOCK();
+ if (do_notify != 0) {
+ devfs_bulk_notify(&event_log);
+ devfs_release_event_log(&event_log, need_free);
+ }
return ;
}
if ((error = dev_dup_entry(NULL, dev_root, &new, devfs_mp_p)))
return error;
devfs_mp_p->plane_root = new;
+ devfs_nmountplanes++;
return error;
}
dev_free_name(dirent_p);
}
devfs_mp_p->plane_root = NULL;
+ devfs_nmountplanes--;
+
+ if (devfs_nmountplanes > (devfs_nmountplanes+1)) {
+ panic("plane count wrapped around.\n");
+ }
}
if(dnp->dn_linklist == dirent_p) {
dnp->dn_linklist = dirent_p->de_nextlink;
}
- dirent_p->de_nextlink->de_prevlinkp
- = dirent_p->de_prevlinkp;
- *dirent_p->de_prevlinkp = dirent_p->de_nextlink;
}
devfs_dn_free(dnp);
}
+
+ dirent_p->de_nextlink->de_prevlinkp = dirent_p->de_prevlinkp;
+ *(dirent_p->de_prevlinkp) = dirent_p->de_nextlink;
/*
* unlink ourselves from the directory on this plane
* associated, or get a new one and associate it with the dev_node
*
* called with DEVFS_LOCK held
- ***************************************************************/
+ *
+ * If an error is returned, then the dnp may have been freed (we
+ * raced with a delete and lost). A devnode should not be accessed
+ * after devfs_dntovn() fails.
+ ****************************************************************/
int
devfs_dntovn(devnode_t * dnp, struct vnode **vn_pp, __unused struct proc * p)
{
struct vnode_fsparam vfsp;
enum vtype vtype = 0;
int markroot = 0;
+ int n_minor = DEVFS_CLONE_ALLOC; /* new minor number for clone device */
+
+ /*
+ * We should never come in and find that our devnode has been marked for delete.
+ * The lookup should have held the lock from entry until now; it should not have
+ * been able to find a removed entry. Any other pathway would have just created
+ * the devnode and come here without dropping the devfs lock, so no one would
+ * have a chance to delete.
+ */
+ if (dnp->dn_lflags & DN_DELETE) {
+ panic("devfs_dntovn: DN_DELETE set on a devnode upon entry.");
+ }
+
+ devfs_ref_node(dnp);
retry:
*vn_pp = NULL;
vn_p = dnp->dn_vn;
- dnp->dn_lflags |= DN_BUSY;
-
if (vn_p) { /* already has a vnode */
uint32_t vid;
*/
vnode_put(vn_p);
}
- /*
- * set the error to EAGAIN
- * which will cause devfs_lookup
- * to retry this node
+
+ /*
+ * This entry is no longer in the namespace. This is only
+ * possible for lookup: no other path would not find an existing
+ * vnode. Therefore, ENOENT is a valid result.
*/
- error = EAGAIN;
+ error = ENOENT;
}
if ( !error)
*vn_pp = vn_p;
- devfs_release_busy(dnp);
-
- return error;
+ goto out;
}
+ /*
+ * If we get here, then we've beaten any deletes;
+ * if someone sets DN_DELETE during a subsequent drop
+ * of the devfs lock, we'll still vend a vnode.
+ */
+
if (dnp->dn_lflags & DN_CREATE) {
dnp->dn_lflags |= DN_CREATEWAIT;
msleep(&dnp->dn_lflags, &devfs_mutex, PRIBIO, 0 , 0);
case DEV_CDEV:
vtype = (dnp->dn_type == DEV_BDEV) ? VBLK : VCHR;
break;
+#if FDESC
+ case DEV_DEVFD:
+ vtype = VDIR;
+ break;
+#endif /* FDESC */
}
vfsp.vnfs_mp = dnp->dn_dvm->mount;
vfsp.vnfs_vtype = vtype;
vfsp.vnfs_cnp = 0;
vfsp.vnfs_vops = *(dnp->dn_ops);
- if (vtype == VBLK || vtype == VCHR)
+ if (vtype == VBLK || vtype == VCHR) {
+ /*
+ * Ask the clone minor number function for a new minor number
+ * to use for the next device instance. If an administative
+ * limit has been reached, this function will return -1.
+ */
+ if (dnp->dn_clone != NULL) {
+ int n_major = major(dnp->dn_typeinfo.dev);
+
+ n_minor = (*dnp->dn_clone)(dnp->dn_typeinfo.dev, DEVFS_CLONE_ALLOC);
+ if (n_minor == -1) {
+ error = ENOMEM;
+ goto out;
+ }
+
+ vfsp.vnfs_rdev = makedev(n_major, n_minor);;
+ } else {
vfsp.vnfs_rdev = dnp->dn_typeinfo.dev;
- else
+ }
+ } else {
vfsp.vnfs_rdev = 0;
+ }
vfsp.vnfs_filesize = 0;
vfsp.vnfs_flags = VNFS_NOCACHE | VNFS_CANTCACHE;
/* Tag system files */
DEVFS_UNLOCK();
error = vnode_create(VNCREATE_FLAVOR, VCREATESIZE, &vfsp, &vn_p);
+
+ /* Do this before grabbing the lock */
+ if (error == 0) {
+ vnode_setneedinactive(vn_p);
+ }
DEVFS_LOCK();
if (error == 0) {
- if ((dnp->dn_vn)) {
- panic("devnode already has a vnode?");
- } else {
- dnp->dn_vn = vn_p;
- *vn_pp = vn_p;
vnode_settag(vn_p, VT_DEVFS);
- }
+
+ if ((dnp->dn_clone != NULL) && (dnp->dn_vn != NULLVP) )
+ panic("devfs_dntovn: cloning device with a vnode?\n");
+
+ *vn_pp = vn_p;
+
+ /*
+ * Another vnode that has this devnode as its v_data.
+ * This reference, unlike the one taken at the start
+ * of the function, persists until a VNOP_RECLAIM
+ * comes through for this vnode.
+ */
+ devfs_ref_node(dnp);
+
+ /*
+ * A cloned vnode is not hooked into the devnode; every lookup
+ * gets a new vnode.
+ */
+ if (dnp->dn_clone == NULL) {
+ dnp->dn_vn = vn_p;
+ }
+ } else if (n_minor != DEVFS_CLONE_ALLOC) {
+ /*
+ * If we failed the create, we need to release the cloned minor
+ * back to the free list. In general, this is only useful if
+ * the clone function results in a state change in the cloned
+ * device for which the minor number was obtained. If we get
+ * past this point withouth falling into this case, it's
+ * assumed that any state to be released will be released when
+ * the vnode is dropped, instead.
+ */
+ (void)(*dnp->dn_clone)(dnp->dn_typeinfo.dev, DEVFS_CLONE_FREE);
}
dnp->dn_lflags &= ~DN_CREATE;
-
if (dnp->dn_lflags & DN_CREATEWAIT) {
dnp->dn_lflags &= ~DN_CREATEWAIT;
wakeup(&dnp->dn_lflags);
}
- devfs_release_busy(dnp);
+out:
+ /*
+ * Release the reference we took to prevent deletion while we weren't holding the lock.
+ * If not returning success, then dropping this reference could delete the devnode;
+ * no one should access a devnode after a call to devfs_dntovn fails.
+ */
+ devfs_rele_node(dnp);
return error;
}
+/*
+ * Increment refcount on a devnode; prevents free of the node
+ * while the devfs lock is not held.
+ */
+void
+devfs_ref_node(devnode_t *dnp)
+{
+ dnp->dn_refcount++;
+}
-/***********************************************************************
- * called with DEVFS_LOCK held
- ***********************************************************************/
-static void
-devfs_release_busy(devnode_t *dnp) {
-
- dnp->dn_lflags &= ~DN_BUSY;
+/*
+ * Release a reference on a devnode. If the devnode is marked for
+ * free and the refcount is dropped to zero, do the free.
+ */
+void
+devfs_rele_node(devnode_t *dnp)
+{
+ dnp->dn_refcount--;
+ if (dnp->dn_refcount < 0) {
+ panic("devfs_rele_node: devnode with a negative refcount!\n");
+ } else if ((dnp->dn_refcount == 0) && (dnp->dn_lflags & DN_DELETE)) {
+ devnode_free(dnp);
+ }
- if (dnp->dn_lflags & DN_DELETE)
- devnode_free(dnp);
}
/***********************************************************************
* called with DEVFS_LOCK held
***********************************************************************/
int
-dev_add_entry(char *name, devnode_t * parent, int type, devnode_type_t * typeinfo,
+dev_add_entry(const char *name, devnode_t * parent, int type, devnode_type_t * typeinfo,
devnode_t * proto, struct devfsmount *dvm, devdirent_t * *nm_pp)
{
devnode_t * dnp;
return error;
}
+static void
+devfs_bulk_notify(devfs_event_log_t delp)
+{
+ uint32_t i;
+ for (i = 0; i < delp->del_used; i++) {
+ devfs_vnode_event_t dvep = &delp->del_entries[i];
+ if (vnode_getwithvid(dvep->dve_vp, dvep->dve_vid) == 0) {
+ vnode_notify(dvep->dve_vp, dvep->dve_events, NULL);
+ vnode_put(dvep->dve_vp);
+ }
+ }
+}
+
+static void
+devfs_record_event(devfs_event_log_t delp, devnode_t *dnp, uint32_t events)
+{
+ if (delp->del_used >= delp->del_max) {
+ panic("devfs event log overflowed.\n");
+ }
+
+ /* Can only notify for nodes that have an associated vnode */
+ if (dnp->dn_vn != NULLVP && vnode_ismonitored(dnp->dn_vn)) {
+ devfs_vnode_event_t dvep = &delp->del_entries[delp->del_used];
+ dvep->dve_vp = dnp->dn_vn;
+ dvep->dve_vid = vnode_vid(dnp->dn_vn);
+ dvep->dve_events = events;
+ delp->del_used++;
+ }
+}
+
+static int
+devfs_init_event_log(devfs_event_log_t delp, uint32_t count, devfs_vnode_event_t buf)
+{
+ devfs_vnode_event_t dvearr;
+
+ if (buf == NULL) {
+ MALLOC(dvearr, devfs_vnode_event_t, count * sizeof(struct devfs_vnode_event), M_TEMP, M_WAITOK | M_ZERO);
+ if (dvearr == NULL) {
+ return ENOMEM;
+ }
+ } else {
+ dvearr = buf;
+ }
+
+ delp->del_max = count;
+ delp->del_used = 0;
+ delp->del_entries = dvearr;
+ return 0;
+}
+
+static void
+devfs_release_event_log(devfs_event_log_t delp, int need_free)
+{
+ if (delp->del_entries == NULL) {
+ panic("Free of devfs notify info that has not been intialized.\n");
+ }
+
+ if (need_free) {
+ FREE(delp->del_entries, M_TEMP);
+ }
+
+ delp->del_entries = NULL;
+}
/*
* Function: devfs_make_node
* chrblk - block or character device (DEVFS_CHAR or DEVFS_BLOCK)
* uid, gid - ownership
* perms - permissions
+ * clone - minor number cloning function
* fmt, ... - path format string with printf args to format the path name
* Returns:
* A handle to a device node if successful, NULL otherwise.
*/
void *
-devfs_make_node(dev_t dev, int chrblk, uid_t uid,
- gid_t gid, int perms, const char *fmt, ...)
+devfs_make_node_clone(dev_t dev, int chrblk, uid_t uid,
+ gid_t gid, int perms, int (*clone)(dev_t dev, int action),
+ const char *fmt, ...)
{
devdirent_t * new_dev = NULL;
- devnode_t * dnp; /* devnode for parent directory */
- devnode_type_t typeinfo;
-
- char *name, *path, buf[256]; /* XXX */
- int i;
+ devfstype_t type;
va_list ap;
+ switch (chrblk) {
+ case DEVFS_CHAR:
+ type = DEV_CDEV;
+ break;
+ case DEVFS_BLOCK:
+ type = DEV_BDEV;
+ break;
+ default:
+ goto out;
+ }
- DEVFS_LOCK();
+ va_start(ap, fmt);
+ new_dev = devfs_make_node_internal(dev, type, uid, gid, perms, clone, fmt, ap);
+ va_end(ap);
+out:
+ return new_dev;
+}
+
+
+/*
+ * Function: devfs_make_node
+ *
+ * Purpose
+ * Create a device node with the given pathname in the devfs namespace.
+ *
+ * Parameters:
+ * dev - the dev_t value to associate
+ * chrblk - block or character device (DEVFS_CHAR or DEVFS_BLOCK)
+ * uid, gid - ownership
+ * perms - permissions
+ * fmt, ... - path format string with printf args to format the path name
+ * Returns:
+ * A handle to a device node if successful, NULL otherwise.
+ */
+void *
+devfs_make_node(dev_t dev, int chrblk, uid_t uid,
+ gid_t gid, int perms, const char *fmt, ...)
+{
+ devdirent_t * new_dev = NULL;
+ devfstype_t type;
+ va_list ap;
- if (!devfs_ready) {
- printf("devfs_make_node: not ready for devices!\n");
- goto out;
- }
if (chrblk != DEVFS_CHAR && chrblk != DEVFS_BLOCK)
goto out;
- DEVFS_UNLOCK();
+ type = (chrblk == DEVFS_BLOCK ? DEV_BDEV : DEV_CDEV);
va_start(ap, fmt);
- vsnprintf(buf, sizeof(buf), fmt, ap);
+ new_dev = devfs_make_node_internal(dev, type, uid, gid, perms, NULL, fmt, ap);
va_end(ap);
+
+out:
+ return new_dev;
+}
+
+static devdirent_t *
+devfs_make_node_internal(dev_t dev, devfstype_t type, uid_t uid,
+ gid_t gid, int perms, int (*clone)(dev_t dev, int action), const char *fmt, va_list ap)
+{
+ devdirent_t * new_dev = NULL;
+ devnode_t * dnp;
+ devnode_type_t typeinfo;
+
+ char *name, buf[256]; /* XXX */
+ const char *path;
+#if CONFIG_MACF
+ char buff[sizeof(buf)];
+#endif
+ int i;
+ uint32_t log_count;
+ struct devfs_event_log event_log;
+ struct devfs_vnode_event stackbuf[NUM_STACK_ENTRIES];
+ int need_free = 0;
+
+ vsnprintf(buf, sizeof(buf), fmt, ap);
+#if CONFIG_MACF
+ bcopy(buf, buff, sizeof(buff));
+ buff[sizeof(buff)-1] = 0;
+#endif
name = NULL;
for(i=strlen(buf); i>0; i--)
name = buf;
path = "/";
}
+
+ log_count = devfs_nmountplanes;
+ if (log_count > NUM_STACK_ENTRIES) {
+wrongsize:
+ need_free = 1;
+ if (devfs_init_event_log(&event_log, log_count, NULL) != 0) {
+ return NULL;
+ }
+ } else {
+ need_free = 0;
+ log_count = NUM_STACK_ENTRIES;
+ if (devfs_init_event_log(&event_log, log_count, &stackbuf[0]) != 0) {
+ return NULL;
+ }
+ }
+
DEVFS_LOCK();
+ if (log_count < devfs_nmountplanes) {
+ DEVFS_UNLOCK();
+ devfs_release_event_log(&event_log, need_free);
+ log_count = log_count * 2;
+ goto wrongsize;
+ }
+
+ if (!devfs_ready) {
+ printf("devfs_make_node: not ready for devices!\n");
+ goto out;
+ }
/* find/create directory path ie. mkdir -p */
- if (dev_finddir(path, NULL, CREATE, &dnp) == 0) {
+ if (dev_finddir(path, NULL, DEVFS_CREATE, &dnp, &event_log) == 0) {
typeinfo.dev = dev;
- if (dev_add_entry(name, dnp,
- (chrblk == DEVFS_CHAR) ? DEV_CDEV : DEV_BDEV,
- &typeinfo, NULL, NULL, &new_dev) == 0) {
+ if (dev_add_entry(name, dnp, type, &typeinfo, NULL, NULL, &new_dev) == 0) {
new_dev->de_dnp->dn_gid = gid;
new_dev->de_dnp->dn_uid = uid;
new_dev->de_dnp->dn_mode |= perms;
- devfs_propogate(dnp->dn_typeinfo.Dir.myname, new_dev);
+ new_dev->de_dnp->dn_clone = clone;
+#if CONFIG_MACF
+ mac_devfs_label_associate_device(dev, new_dev->de_dnp, buff);
+#endif
+ devfs_propogate(dnp->dn_typeinfo.Dir.myname, new_dev, &event_log);
}
}
+
out:
DEVFS_UNLOCK();
+ devfs_bulk_notify(&event_log);
+ devfs_release_event_log(&event_log, need_free);
return new_dev;
}
devdirent_t * new_dev = NULL;
devdirent_t * orig = (devdirent_t *) original;
devnode_t * dirnode; /* devnode for parent directory */
+ struct devfs_event_log event_log;
+ uint32_t log_count;
va_list ap;
char *p, buf[256]; /* XXX */
DEVFS_LOCK();
if (!devfs_ready) {
+ DEVFS_UNLOCK();
printf("devfs_make_link: not ready for devices!\n");
- goto out;
+ return -1;
}
DEVFS_UNLOCK();
break;
}
}
+
+ /*
+ * One slot for each directory, one for each devnode
+ * whose link count changes
+ */
+ log_count = devfs_nmountplanes * 2;
+wrongsize:
+ if (devfs_init_event_log(&event_log, log_count, NULL) != 0) {
+ /* No lock held, no allocations done, can just return */
+ return -1;
+ }
+
DEVFS_LOCK();
+ if (log_count < devfs_nmountplanes) {
+ DEVFS_UNLOCK();
+ devfs_release_event_log(&event_log, 1);
+ log_count = log_count * 2;
+ goto wrongsize;
+ }
+
if (p) {
*p++ = '\0';
- if (dev_finddir(buf, NULL, CREATE, &dirnode)
+ if (dev_finddir(buf, NULL, DEVFS_CREATE, &dirnode, &event_log)
|| dev_add_name(p, dirnode, NULL, orig->de_dnp, &new_dev))
goto fail;
} else {
- if (dev_finddir("", NULL, CREATE, &dirnode)
+ if (dev_finddir("", NULL, DEVFS_CREATE, &dirnode, &event_log)
|| dev_add_name(buf, dirnode, NULL, orig->de_dnp, &new_dev))
goto fail;
}
- devfs_propogate(dirnode->dn_typeinfo.Dir.myname, new_dev);
+ devfs_propogate(dirnode->dn_typeinfo.Dir.myname, new_dev, &event_log);
fail:
-out:
DEVFS_UNLOCK();
+ devfs_bulk_notify(&event_log);
+ devfs_release_event_log(&event_log, 1);
return ((new_dev != NULL) ? 0 : -1);
}
-
projects / apple / xnu.git / blobdiff