/*
- * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2014 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* 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
* 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.
- *
+ *
* 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,
* 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_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright 1997,1998 Julian Elischer. All rights reserved.
* julian@freebsd.org
- *
+ *
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
- *
+ *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
- *
+ *
* devfs_tree.c
*/
/*
* vnode instead of the existing one that has the mounted_here
* field filled in; the net effect was that the filesystem mounted
* on top of us would never show up
- * - added devfs_stats to store how many data structures are actually
+ * - added devfs_stats to store how many data structures are actually
* allocated
*/
#include <sys/vnode_internal.h>
#include <stdarg.h>
#include <libkern/OSAtomic.h>
-#define BSD_KERNEL_PRIVATE 1 /* devfs_make_link() prototype */
+#include <os/refcnt.h>
+#define BSD_KERNEL_PRIVATE 1 /* devfs_make_link() prototype */
#include "devfs.h"
#include "devfsdefs.h"
#endif
typedef struct devfs_vnode_event {
- vnode_t dve_vp;
- uint32_t dve_vid;
- uint32_t dve_events;
+ 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
+/*
+ * 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
+#define NUM_STACK_ENTRIES 5
typedef struct devfs_event_log {
- size_t del_max;
- size_t del_used;
- devfs_vnode_event_t del_entries;
+ 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 *, 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);
+
+static void dev_free_hier(devdirent_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;
-lck_grp_attr_t * devfs_lck_grp_attr;
-lck_attr_t * devfs_lck_attr;
-lck_mtx_t devfs_mutex;
-lck_mtx_t devfs_attr_mutex;
+lck_grp_t * devfs_lck_grp;
+lck_grp_attr_t * devfs_lck_grp_attr;
+lck_attr_t * devfs_lck_attr;
+lck_mtx_t devfs_mutex;
+lck_mtx_t devfs_attr_mutex;
-devdirent_t * dev_root = NULL; /* root of backing tree */
-struct devfs_stats devfs_stats; /* hold stats */
+os_refgrp_decl(static, devfs_refgrp, "devfs", NULL);
-static ino_t devfs_unique_fileno = 0;
+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;
static int devfs_ready = 0;
static uint32_t devfs_nmountplanes = 0; /* The first plane is not used for a mount */
-#define DEVFS_NOCREATE FALSE
-#define DEVFS_CREATE TRUE
+#define DEVFS_NOCREATE FALSE
+#define DEVFS_CREATE TRUE
/*
* Set up the root directory node in the backing plane
int
devfs_sinit(void)
{
- int error;
+ int error;
- devfs_lck_grp_attr = lck_grp_attr_alloc_init();
+ devfs_lck_grp_attr = lck_grp_attr_alloc_init();
devfs_lck_grp = lck_grp_alloc_init("devfs_lock", devfs_lck_grp_attr);
devfs_lck_attr = lck_attr_alloc_init();
lck_mtx_init(&devfs_attr_mutex, devfs_lck_grp, devfs_lck_attr);
DEVFS_LOCK();
- error = dev_add_entry("root", NULL, DEV_DIR, NULL, NULL, NULL, &dev_root);
+ error = dev_add_entry("root", NULL, DEV_DIR, NULL, NULL, NULL, &dev_root);
DEVFS_UNLOCK();
if (error) {
- printf("devfs_sinit: dev_add_entry failed ");
- return (ENOTSUP);
+ printf("devfs_sinit: dev_add_entry failed ");
+ return ENOTSUP;
}
#ifdef HIDDEN_MOUNTPOINT
- MALLOC(devfs_hidden_mount, struct mount *, sizeof(struct mount),
- M_MOUNT, M_WAITOK);
- bzero(devfs_hidden_mount,sizeof(struct mount));
+ devfs_hidden_mount = zalloc_flags(mount_zone, Z_WAITOK | Z_ZERO);
mount_lock_init(devfs_hidden_mount);
TAILQ_INIT(&devfs_hidden_mount->mnt_vnodelist);
TAILQ_INIT(&devfs_hidden_mount->mnt_workerqueue);
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;
+ 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("/"),
+ mac_devfs_label_associate_directory("/", (int) strlen("/"),
dev_root->de_dnp, "/");
#endif
devfs_ready = 1;
- return (0);
+ return 0;
}
/***********************************************************************\
/***************************************************************
- * Search down the linked list off a dir to find "name"
- * return the devnode_t * for that node.
- *
- * called with DEVFS_LOCK held
- ***************************************************************/
+* Search down the linked list off a dir to find "name"
+* return the devnode_t * for that node.
+*
+* called with DEVFS_LOCK held
+***************************************************************/
devdirent_t *
dev_findname(devnode_t * dir, const char *name)
{
devdirent_t * newfp;
- if (dir->dn_type != DEV_DIR) return 0;/*XXX*/ /* printf?*/
-
- if (name[0] == '.')
- {
- if(name[1] == 0)
- {
+ if (dir->dn_type != DEV_DIR) {
+ return 0; /*XXX*/ /* printf?*/
+ }
+ if (name[0] == '.') {
+ if (name[1] == 0) {
return dir->dn_typeinfo.Dir.myname;
}
- if((name[1] == '.') && (name[2] == 0))
- {
+ if ((name[1] == '.') && (name[2] == 0)) {
/* for root, .. == . */
return dir->dn_typeinfo.Dir.parent->dn_typeinfo.Dir.myname;
}
}
newfp = dir->dn_typeinfo.Dir.dirlist;
- while(newfp)
- {
- if(!(strncmp(name, newfp->de_name, sizeof(newfp->de_name))))
+ while (newfp) {
+ if (!(strncmp(name, newfp->de_name, sizeof(newfp->de_name)))) {
return newfp;
+ }
newfp = newfp->de_next;
}
return NULL;
}
/***********************************************************************
- * 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 '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
- ***********************************************************************/
+* 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 '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(const char * path,
- devnode_t * dirnode,
- int create,
- devnode_t * * dn_pp,
- devfs_event_log_t delp)
+dev_finddir(const char * path,
+ devnode_t * dirnode,
+ int create,
+ devnode_t * * dn_pp,
+ devfs_event_log_t delp)
{
- devnode_t * dnp = NULL;
- int error = 0;
- const char * scan;
+ devnode_t * dnp = NULL;
+ int error = 0;
+ const char * scan;
#if CONFIG_MACF
char fullpath[DEVMAXPATHSIZE];
#endif
- if (!dirnode) /* dirnode == NULL means start at root */
- dirnode = dev_root->de_dnp;
+ if (!dirnode) { /* dirnode == NULL means start at root */
+ dirnode = dev_root->de_dnp;
+ }
- if (dirnode->dn_type != DEV_DIR)
- return ENOTDIR;
+ if (dirnode->dn_type != DEV_DIR) {
+ return ENOTDIR;
+ }
- if (strlen(path) > (DEVMAXPATHSIZE - 1))
- return ENAMETOOLONG;
+ if (strlen(path) > (DEVMAXPATHSIZE - 1)) {
+ return ENAMETOOLONG;
+ }
#if CONFIG_MACF
- strlcpy (fullpath, path, DEVMAXPATHSIZE);
+ strlcpy(fullpath, path, DEVMAXPATHSIZE);
#endif
scan = path;
- while (*scan == '/')
- scan++;
+ while (*scan == '/') {
+ scan++;
+ }
*dn_pp = NULL;
while (1) {
- char component[DEVMAXPATHSIZE];
- devdirent_t * dirent_p;
- const char * start;
-
- if (*scan == 0) {
- /* we hit the end of the string, we're done */
- *dn_pp = dirnode;
- break;
- }
- start = scan;
- while (*scan != '/' && *scan)
- scan++;
-
- strlcpy(component, start, scan - start);
- if (*scan == '/')
- scan++;
+ char component[DEVMAXPATHSIZE];
+ devdirent_t * dirent_p;
+ const char * start;
- dirent_p = dev_findname(dirnode, component);
- if (dirent_p) {
- dnp = dirent_p->de_dnp;
- if (dnp->dn_type != DEV_DIR) {
- error = ENOTDIR;
- break;
+ if (*scan == 0) {
+ /* we hit the end of the string, we're done */
+ *dn_pp = dirnode;
+ break;
+ }
+ start = scan;
+ while (*scan != '/' && *scan) {
+ scan++;
}
- }
- else {
- if (!create) {
- error = ENOENT;
- break;
+
+ strlcpy(component, start, (scan - start) + 1);
+ if (*scan == '/') {
+ scan++;
}
- error = dev_add_entry(component, dirnode,
- DEV_DIR, NULL, NULL, NULL, &dirent_p);
- if (error)
- break;
- dnp = dirent_p->de_dnp;
+
+ dirent_p = dev_findname(dirnode, component);
+ if (dirent_p) {
+ dnp = dirent_p->de_dnp;
+ if (dnp->dn_type != DEV_DIR) {
+ error = ENOTDIR;
+ break;
+ }
+ } else {
+ if (!create) {
+ error = ENOENT;
+ break;
+ }
+ error = dev_add_entry(component, dirnode,
+ DEV_DIR, NULL, NULL, NULL, &dirent_p);
+ if (error) {
+ break;
+ }
+ dnp = dirent_p->de_dnp;
#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);
+ mac_devfs_label_associate_directory(
+ dirnode->dn_typeinfo.Dir.myname->de_name,
+ (int) 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 */
+ devfs_propogate(dirnode->dn_typeinfo.Dir.myname, dirent_p, delp);
+ }
+ dirnode = dnp; /* continue relative to this directory */
}
- return (error);
+ return error;
}
/***********************************************************************
- * Add a new NAME element to the devfs
- * If we're creating a root node, then dirname is NULL
- * Basically this creates a new namespace entry for the device node
- *
- * Creates a name node, and links it to the supplied node
- *
- * called with DEVFS_LOCK held
- ***********************************************************************/
+* Add a new NAME element to the devfs
+* If we're creating a root node, then dirname is NULL
+* Basically this creates a new namespace entry for the device node
+*
+* Creates a name node, and links it to the supplied node
+*
+* called with DEVFS_LOCK held
+***********************************************************************/
int
-dev_add_name(const 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;
+ devdirent_t * dirent_p = NULL;
- if(dirnode != NULL ) {
- if(dirnode->dn_type != DEV_DIR) return(ENOTDIR);
-
- if( dev_findname(dirnode,name))
- return(EEXIST);
+ if (dirnode != NULL) {
+ if (dirnode->dn_type != DEV_DIR) {
+ return ENOTDIR;
+ }
+
+ if (dev_findname(dirnode, name)) {
+ return EEXIST;
+ }
}
/*
* make sure the name is legal
* slightly misleading in the case of NULL
*/
- if (!name || (strlen(name) > (DEVMAXNAMESIZE - 1)))
- return (ENAMETOOLONG);
+ if (!name || (strlen(name) > (DEVMAXNAMESIZE - 1))) {
+ return ENAMETOOLONG;
+ }
/*
- * Allocate and fill out a new directory entry
+ * Allocate and fill out a new directory entry
*/
- MALLOC(dirent_p, devdirent_t *, sizeof(devdirent_t),
- M_DEVFSNAME, M_WAITOK);
+ MALLOC(dirent_p, devdirent_t *, sizeof(devdirent_t),
+ M_DEVFSNAME, M_WAITOK);
if (!dirent_p) {
- return ENOMEM;
+ return ENOMEM;
}
- bzero(dirent_p,sizeof(devdirent_t));
+ bzero(dirent_p, sizeof(devdirent_t));
/* inherrit our parent's mount info */ /*XXX*/
/* a kludge but.... */
- if(dirnode && ( dnp->dn_dvm == NULL)) {
+ if (dirnode && (dnp->dn_dvm == NULL)) {
dnp->dn_dvm = dirnode->dn_dvm;
/* if(!dnp->dn_dvm) printf("parent had null dvm "); */
}
* this stops it from being accidentally freed later.
*/
dirent_p->de_dnp = dnp;
- dnp->dn_links++ ; /* implicit from our own name-node */
+ dnp->dn_links++; /* implicit from our own name-node */
- /*
+ /*
* Make sure that we can find all the links that reference a node
* so that we can get them all if we need to zap the node.
*/
- if(dnp->dn_linklist) {
+ if (dnp->dn_linklist) {
dirent_p->de_nextlink = dnp->dn_linklist;
dirent_p->de_prevlinkp = dirent_p->de_nextlink->de_prevlinkp;
dirent_p->de_nextlink->de_prevlinkp = &(dirent_p->de_nextlink);
dnp->dn_linklist = dirent_p;
/*
- * If the node is a directory, then we need to handle the
+ * If the node is a directory, then we need to handle the
* creation of the .. link.
* A NULL dirnode indicates a root node, so point to ourself.
*/
- if(dnp->dn_type == DEV_DIR) {
+ if (dnp->dn_type == DEV_DIR) {
dnp->dn_typeinfo.Dir.myname = dirent_p;
/*
* If we are unlinking from an old dir, decrement its links
* as we point our '..' elsewhere
- * Note: it's up to the calling code to remove the
+ * Note: it's up to the calling code to remove the
* us from the original directory's list
*/
- if(dnp->dn_typeinfo.Dir.parent) {
+ if (dnp->dn_typeinfo.Dir.parent) {
dnp->dn_typeinfo.Dir.parent->dn_links--;
}
- if(dirnode) {
+ if (dirnode) {
dnp->dn_typeinfo.Dir.parent = dirnode;
} else {
dnp->dn_typeinfo.Dir.parent = dnp;
* Check if we are not making a root node..
* (i.e. have parent)
*/
- if(dirnode) {
+ if (dirnode) {
/*
- * Put it on the END of the linked list of directory entries
- */
+ * Put it on the END of the linked list of directory entries
+ */
dirent_p->de_parent = dirnode; /* null for root */
dirent_p->de_prevp = dirnode->dn_typeinfo.Dir.dirlast;
- dirent_p->de_next = *(dirent_p->de_prevp); /* should be NULL */
- /*right?*/
+ dirent_p->de_next = *(dirent_p->de_prevp); /* should be NULL */
+ /*right?*/
*(dirent_p->de_prevp) = dirent_p;
dirnode->dn_typeinfo.Dir.dirlast = &(dirent_p->de_next);
dirnode->dn_typeinfo.Dir.entrycount++;
*dirent_pp = dirent_p;
DEVFS_INCR_ENTRIES();
- return 0 ;
+ return 0;
}
/***********************************************************************
- * Add a new element to the devfs plane.
- *
- * Creates a new dev_node to go with it if the prototype should not be
- * 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 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
- * Even in SPLIT_DEVS mode,
- * if the node already exists on the wanted plane, just return it
- *
- * called with DEVFS_LOCK held
+* Add a new element to the devfs plane.
+*
+* Creates a new dev_node to go with it if the prototype should not be
+* 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 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
+* Even in SPLIT_DEVS mode,
+* if the node already exists on the wanted plane, just return it
+*
+* called with DEVFS_LOCK held
***********************************************************************/
int
dev_add_node(int entrytype, devnode_type_t * typeinfo, devnode_t * proto,
- devnode_t * *dn_pp, struct devfsmount *dvm)
+ devnode_t * *dn_pp, struct devfsmount *dvm)
{
- devnode_t * dnp = NULL;
+ devnode_t * dnp = NULL;
+ int error = 0;
#if defined SPLIT_DEVS
/*
*/
if (proto) {
dnp = proto->dn_nextsibling;
- while( dnp != proto) {
+ while (dnp != proto) {
if (dnp->dn_dvm == dvm) {
*dn_pp = dnp;
- return (0);
+ return 0;
}
dnp = dnp->dn_nextsibling;
}
- if (typeinfo == NULL)
+ if (typeinfo == NULL) {
typeinfo = &(proto->dn_typeinfo);
+ }
}
-#else /* SPLIT_DEVS */
- if ( proto ) {
+#else /* SPLIT_DEVS */
+ if (proto) {
switch (proto->type) {
- case DEV_BDEV:
- case DEV_CDEV:
- *dn_pp = proto;
- return 0;
+ case DEV_BDEV:
+ case DEV_CDEV:
+ *dn_pp = proto;
+ return 0;
}
}
-#endif /* SPLIT_DEVS */
+#endif /* SPLIT_DEVS */
MALLOC(dnp, devnode_t *, sizeof(devnode_t), M_DEVFSNODE, M_WAITOK);
if (!dnp) {
- return ENOMEM;
+ return ENOMEM;
}
/*
mac_devfs_label_copy(proto->dn_label, dnp->dn_label);
#endif
} else {
- struct timeval tv;
+ struct timeval tv;
- /*
+ /*
* We have no prototype, so start off with a clean slate
*/
microtime(&tv);
#endif
}
dnp->dn_dvm = dvm;
- dnp->dn_refcount = 0;
+
+ /* Note: this inits the reference count to 1, this is considered unreferenced */
+ os_ref_init_raw(&dnp->dn_refcount, &devfs_refgrp);
dnp->dn_ino = devfs_unique_fileno;
devfs_unique_fileno++;
/*
* fill out the dev node according to type
*/
- switch(entrytype) {
+ switch (entrytype) {
case DEV_DIR:
/*
* As it's a directory, make sure
* that we use (by default) for directories
*/
dnp->dn_ops = &devfs_vnodeop_p;
- dnp->dn_mode |= 0555; /* default perms */
+ dnp->dn_mode |= 0555; /* default perms */
break;
case DEV_SLNK:
/*
* As it's a symlink allocate and store the link info
* Symlinks should only ever be created by the user,
- * so they are not on the back plane and should not be
+ * so they are not on the back plane and should not be
* propogated forward.. a bit like directories in that way..
* A symlink only exists on one plane and has its own
* node.. therefore we might be on any random plane.
*/
- MALLOC(dnp->dn_typeinfo.Slnk.name, char *,
- typeinfo->Slnk.namelen+1,
- M_DEVFSNODE, M_WAITOK);
+ MALLOC(dnp->dn_typeinfo.Slnk.name, char *,
+ typeinfo->Slnk.namelen + 1,
+ M_DEVFSNODE, M_WAITOK);
if (!dnp->dn_typeinfo.Slnk.name) {
- FREE(dnp,M_DEVFSNODE);
- return ENOMEM;
+ error = ENOMEM;
+ break;
}
strlcpy(dnp->dn_typeinfo.Slnk.name, typeinfo->Slnk.name,
- typeinfo->Slnk.namelen + 1);
+ 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_mode |= 0555; /* default perms */
+ dnp->dn_mode |= 0555; /* default perms */
break;
case DEV_CDEV:
case DEV_BDEV:
/* /dev/fd is special */
case DEV_DEVFD:
dnp->dn_ops = &devfs_devfd_vnodeop_p;
- dnp->dn_mode |= 0555; /* default perms */
+ dnp->dn_mode |= 0555; /* default perms */
break;
#endif /* FDESC */
default:
- return EINVAL;
+ error = EINVAL;
+ }
+
+ if (error) {
+ FREE(dnp, M_DEVFSNODE);
+ } else {
+ *dn_pp = dnp;
+ DEVFS_INCR_NODES();
}
- *dn_pp = dnp;
- DEVFS_INCR_NODES();
- return 0 ;
+ return error;
}
#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);
- }
- DEVFS_DECR_NODES();
- FREE(dnp, M_DEVFSNODE);
+ if (dnp->dn_type == DEV_SLNK) {
+ DEVFS_DECR_STRINGSPACE(dnp->dn_typeinfo.Slnk.namelen + 1);
+ FREE(dnp->dn_typeinfo.Slnk.name, M_DEVFSNODE);
+ }
+ DEVFS_DECR_NODES();
+ FREE(dnp, M_DEVFSNODE);
}
static void
devfs_dn_free(devnode_t * dnp)
{
- if(--dnp->dn_links <= 0 ) /* can be -1 for initial free, on error */
- {
+ if (--dnp->dn_links <= 0) { /* can be -1 for initial free, on error */
/*probably need to do other cleanups XXX */
if (dnp->dn_nextsibling != dnp) {
- devnode_t * * prevp = dnp->dn_prevsiblingp;
+ devnode_t * * prevp = dnp->dn_prevsiblingp;
*prevp = dnp->dn_nextsibling;
dnp->dn_nextsibling->dn_prevsiblingp = prevp;
-
}
/* 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_lflags |= DN_DELETE;
+ os_ref_count_t rc = os_ref_get_count_raw(&dnp->dn_refcount);
+ if (rc == 1) {
+ /* release final reference from dev_add_node */
+ (void) os_ref_release_locked_raw(&dnp->dn_refcount, &devfs_refgrp);
+ devnode_free(dnp);
+ } else {
+ dnp->dn_lflags |= DN_DELETE;
}
}
}
/***********************************************************************\
-* Front Node Operations *
+* Front Node Operations *
* Add or delete a chain of front nodes *
\***********************************************************************/
/***********************************************************************
- * Given a directory backing node, and a child backing node, add the
- * appropriate front nodes to the front nodes of the directory to
- * represent the child node to the user
- *
- * on failure, front nodes will either be correct or not exist for each
- * front dir, however dirs completed will not be stripped of completed
- * frontnodes on failure of a later frontnode
- *
- * This allows a new node to be propogated through all mounted planes
- *
- * called with DEVFS_LOCK held
- ***********************************************************************/
+* Given a directory backing node, and a child backing node, add the
+* appropriate front nodes to the front nodes of the directory to
+* represent the child node to the user
+*
+* on failure, front nodes will either be correct or not exist for each
+* front dir, however dirs completed will not be stripped of completed
+* frontnodes on failure of a later frontnode
+*
+* This allows a new node to be propogated through all mounted planes
+*
+* called with DEVFS_LOCK held
+***********************************************************************/
static int
-devfs_propogate(devdirent_t * parent,devdirent_t * child, devfs_event_log_t delp)
+devfs_propogate(devdirent_t * parent, devdirent_t * child, devfs_event_log_t delp)
{
- int error;
+ int error;
devdirent_t * newnmp;
- devnode_t * dnp = child->de_dnp;
- devnode_t * pdnp = parent->de_dnp;
- devnode_t * adnp = parent->de_dnp;
+ devnode_t * dnp = child->de_dnp;
+ 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
- ***********************************************/
+ * Find the other instances of the parent node
+ ***********************************************/
for (adnp = pdnp->dn_nextsibling;
- adnp != pdnp;
- adnp = adnp->dn_nextsibling)
- {
+ adnp != pdnp;
+ adnp = adnp->dn_nextsibling) {
/*
* Make the node, using the original as a prototype)
* if the node already exists on that plane it won't be
* re-made..
*/
if ((error = dev_add_entry(child->de_name, adnp, type,
- NULL, dnp, adnp->dn_dvm,
- &newnmp)) != 0) {
- printf("duplicating %s failed\n",child->de_name);
+ 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
+ * then the buffer is large enough for two nodes in each
* plane; otherwise, there's no vnode and this call will
* do nothing.
*/
}
}
}
- return 0; /* for now always succeed */
+ return 0; /* for now always succeed */
}
static uint32_t
uint32_t notify_count = 0;
devnode_t *dnp2;
- /*
- * Could need to notify for one removed node on each mount and
+ /*
+ * 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;
+ notify_count += dnp->dn_links;
for (dnp2 = dnp->dn_nextsibling; dnp2 != dnp; dnp2 = dnp2->dn_nextsibling) {
- notify_count += dnp2->dn_links;
+ notify_count += dnp2->dn_links;
}
return notify_count;
-
}
/***********************************************************************
- * remove all instances of this devicename [for backing nodes..]
- * note.. if there is another link to the node (non dir nodes only)
- * then the devfs_node will still exist as the ref count will be non-0
- * removing a directory node will remove all sup-nodes on all planes (ZAP)
- *
- * Used by device drivers to remove nodes that are no longer relevant
- * The argument is the 'cookie' they were given when they created the node
- * this function is exported.. see devfs.h
- ***********************************************************************/
+* remove all instances of this devicename [for backing nodes..]
+* note.. if there is another link to the node (non dir nodes only)
+* then the devfs_node will still exist as the ref count will be non-0
+* removing a directory node will remove all sup-nodes on all planes (ZAP)
+*
+* Used by device drivers to remove nodes that are no longer relevant
+* The argument is the 'cookie' they were given when they created the node
+* this function is exported.. see devfs.h
+***********************************************************************/
void
devfs_remove(void *dirent_p)
{
boolean_t lastlink;
struct devfs_event_log event_log;
uint32_t log_count = 0;
- int do_notify = 0;
- int need_free = 0;
+ int do_notify = 0;
+ int need_free = 0;
struct devfs_vnode_event stackbuf[NUM_STACK_ENTRIES];
-
+
DEVFS_LOCK();
if (!devfs_ready) {
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);
/* keep removing the next sibling till only we exist. */
while ((dnp2 = dnp->dn_nextsibling) != dnp) {
-
/*
* Keep removing the next front node till no more exist
*/
- dnp->dn_nextsibling = dnp2->dn_nextsibling;
+ dnp->dn_nextsibling = dnp2->dn_nextsibling;
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);
devfs_release_event_log(&event_log, need_free);
}
- return ;
+ return;
}
int
dev_dup_plane(struct devfsmount *devfs_mp_p)
{
- devdirent_t * new;
- int error = 0;
+ devdirent_t * new;
+ int error = 0;
- if ((error = dev_dup_entry(NULL, dev_root, &new, devfs_mp_p)))
- return error;
+ if ((error = dev_dup_entry(NULL, dev_root, &new, devfs_mp_p))) {
+ return error;
+ }
devfs_mp_p->plane_root = new;
devfs_nmountplanes++;
return error;
/***************************************************************
- * Free a whole plane
- *
- * called with DEVFS_LOCK held
- ***************************************************************/
+* Free a whole plane
+*
+* called with DEVFS_LOCK held
+***************************************************************/
void
devfs_free_plane(struct devfsmount *devfs_mp_p)
{
devfs_mp_p->plane_root = NULL;
devfs_nmountplanes--;
- if (devfs_nmountplanes > (devfs_nmountplanes+1)) {
+ if (devfs_nmountplanes > (devfs_nmountplanes + 1)) {
panic("plane count wrapped around.\n");
}
}
/***************************************************************
- * Create and link in a new front element..
- * Parent can be 0 for a root node
- * Not presently usable to make a symlink XXX
- * (Ok, symlinks don't propogate)
- * recursively will create subnodes corresponding to equivalent
- * child nodes in the base level
- *
- * called with DEVFS_LOCK held
- ***************************************************************/
+* Create and link in a new front element..
+* Parent can be 0 for a root node
+* Not presently usable to make a symlink XXX
+* (Ok, symlinks don't propogate)
+* recursively will create subnodes corresponding to equivalent
+* child nodes in the base level
+*
+* called with DEVFS_LOCK held
+***************************************************************/
static int
dev_dup_entry(devnode_t * parent, devdirent_t * back, devdirent_t * *dnm_pp,
- struct devfsmount *dvm)
+ struct devfsmount *dvm)
{
- devdirent_t * entry_p;
- devdirent_t * newback;
- devdirent_t * newfront;
- int error;
- devnode_t * dnp = back->de_dnp;
+ devdirent_t * entry_p = NULL;
+ devdirent_t * newback;
+ devdirent_t * newfront;
+ int error;
+ devnode_t * dnp = back->de_dnp;
int type = dnp->dn_type;
/*
* go get the node made (if we need to)
* use the back one as a prototype
*/
- if ((error = dev_add_entry(back->de_name, parent, type,
- NULL, dnp,
- parent?parent->dn_dvm:dvm, &entry_p)) != 0) {
- printf("duplicating %s failed\n",back->de_name);
+ error = dev_add_entry(back->de_name, parent, type, NULL, dnp,
+ parent?parent->dn_dvm:dvm, &entry_p);
+ if (!error && (entry_p == NULL)) {
+ error = ENOMEM; /* Really can't happen, but make static analyzer happy */
+ }
+ if (error != 0) {
+ printf("duplicating %s failed\n", back->de_name);
+ goto out;
}
/*
* If we have just made the root, then insert the pointer to the
* mount information
*/
- if(dvm) {
+ if (dvm) {
entry_p->de_dnp->dn_dvm = dvm;
}
* subnodes in it....
* note that this time we don't pass on the mount info..
*/
- if (type == DEV_DIR)
- {
- for(newback = back->de_dnp->dn_typeinfo.Dir.dirlist;
- newback; newback = newback->de_next)
- {
- if((error = dev_dup_entry(entry_p->de_dnp,
- newback, &newfront, NULL)) != 0)
- {
+ if (type == DEV_DIR) {
+ for (newback = back->de_dnp->dn_typeinfo.Dir.dirlist;
+ newback; newback = newback->de_next) {
+ if ((error = dev_dup_entry(entry_p->de_dnp,
+ newback, &newfront, NULL)) != 0) {
break; /* back out with an error */
}
}
}
+out:
*dnm_pp = entry_p;
return error;
}
/***************************************************************
- * Free a name node
- * remember that if there are other names pointing to the
- * dev_node then it may not get freed yet
- * can handle if there is no dnp
- *
- * called with DEVFS_LOCK held
- ***************************************************************/
+* Free a name node
+* remember that if there are other names pointing to the
+* dev_node then it may not get freed yet
+* can handle if there is no dnp
+*
+* called with DEVFS_LOCK held
+***************************************************************/
int
dev_free_name(devdirent_t * dirent_p)
{
- devnode_t * parent = dirent_p->de_parent;
- devnode_t * dnp = dirent_p->de_dnp;
+ devnode_t * parent = dirent_p->de_parent;
+ devnode_t * dnp = dirent_p->de_dnp;
- if(dnp) {
- if(dnp->dn_type == DEV_DIR)
- {
- devnode_t * p;
+ if (dnp) {
+ if (dnp->dn_type == DEV_DIR) {
+ devnode_t * p;
- if(dnp->dn_typeinfo.Dir.dirlist)
- return (ENOTEMPTY);
+ if (dnp->dn_typeinfo.Dir.dirlist) {
+ return ENOTEMPTY;
+ }
p = dnp->dn_typeinfo.Dir.parent;
- devfs_dn_free(dnp); /* account for '.' */
- devfs_dn_free(p); /* '..' */
+ devfs_dn_free(dnp); /* account for '.' */
+ devfs_dn_free(p); /* '..' */
}
/*
* unlink us from the list of links for this node
* If we are the only link, it's easy!
* if we are a DIR of course there should not be any
* other links.
- */
- if(dirent_p->de_nextlink == dirent_p) {
- dnp->dn_linklist = NULL;
+ */
+ if (dirent_p->de_nextlink == dirent_p) {
+ dnp->dn_linklist = NULL;
} else {
- if(dnp->dn_linklist == dirent_p) {
+ if (dnp->dn_linklist == dirent_p) {
dnp->dn_linklist = 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
*/
- if(parent) /* if not fs root */
- {
- if( (*dirent_p->de_prevp = dirent_p->de_next) )/* yes, assign */
- {
+ if (parent) { /* if not fs root */
+ if ((*dirent_p->de_prevp = dirent_p->de_next)) {/* yes, assign */
dirent_p->de_next->de_prevp = dirent_p->de_prevp;
- }
- else
- {
+ } else {
parent->dn_typeinfo.Dir.dirlast
- = dirent_p->de_prevp;
+ = dirent_p->de_prevp;
}
parent->dn_typeinfo.Dir.entrycount--;
parent->dn_len -= strlen(dirent_p->de_name) + 8;
/***************************************************************
- * Free a hierarchy starting at a directory node name
- * remember that if there are other names pointing to the
- * dev_node then it may not get freed yet
- * can handle if there is no dnp
- * leave the node itself allocated.
- *
- * called with DEVFS_LOCK held
- ***************************************************************/
+* Free a hierarchy starting at a directory node name
+* remember that if there are other names pointing to the
+* dev_node then it may not get freed yet
+* can handle if there is no dnp
+* leave the node itself allocated.
+*
+* called with DEVFS_LOCK held
+***************************************************************/
static void
dev_free_hier(devdirent_t * dirent_p)
{
- devnode_t * dnp = dirent_p->de_dnp;
+ devnode_t * dnp = dirent_p->de_dnp;
- if(dnp) {
- if(dnp->dn_type == DEV_DIR)
- {
- while(dnp->dn_typeinfo.Dir.dirlist)
- {
+ if (dnp) {
+ if (dnp->dn_type == DEV_DIR) {
+ while (dnp->dn_typeinfo.Dir.dirlist) {
dev_free_hier(dnp->dn_typeinfo.Dir.dirlist);
dev_free_name(dnp->dn_typeinfo.Dir.dirlist);
}
struct vnode_fsparam vfsp;
enum vtype vtype = 0;
int markroot = 0;
+ int nretries = 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
vn_p = dnp->dn_vn;
if (vn_p) { /* already has a vnode */
- uint32_t vid;
-
+ uint32_t vid;
+
vid = vnode_vid(vn_p);
DEVFS_UNLOCK();
- error = vnode_getwithvid(vn_p, vid);
+ /*
+ * We want to use the drainok variant of vnode_getwithvid
+ * because we _don't_ want to get an iocount if the vnode is
+ * is blocked in vnode_drain as it can cause infinite
+ * loops in vn_open_auth. While in use vnodes are typically
+ * only reclaimed on forced unmounts, In use devfs tty vnodes
+ * can be quite frequently reclaimed by revoke(2) or by the
+ * exit of a controlling process.
+ */
+ error = vnode_getwithvid_drainok(vn_p, vid);
- DEVFS_LOCK();
+ DEVFS_LOCK();
if (dnp->dn_lflags & DN_DELETE) {
- /*
+ /*
* our BUSY node got marked for
* deletion while the DEVFS lock
* was dropped...
*/
- if (error == 0) {
- /*
+ if (error == 0) {
+ /*
* vnode_getwithvid returned a valid ref
* which we need to drop
*/
- vnode_put(vn_p);
+ vnode_put(vn_p);
}
-
- /*
- * This entry is no longer in the namespace. This is only
+
+ /*
+ * 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 = ENOENT;
+ } else if (error == ENODEV) {
+ /*
+ * The Filesystem is getting unmounted.
+ */
+ error = ENOENT;
+ } else if (error && (nretries < DEV_MAX_VNODE_RETRY)) {
+ /*
+ * If we got an error from vnode_getwithvid, it means
+ * we raced with a recycle and lost i.e. we asked for
+ * an iocount only after vnode_drain had been entered
+ * for the vnode and returned with an error only after
+ * devfs_reclaim was called on the vnode. devfs_reclaim
+ * sets dn_vn to NULL but while we were waiting to
+ * reacquire DEVFS_LOCK, another vnode might have gotten
+ * associated with the dnp. In either case, we need to
+ * retry otherwise we will end up returning an ENOENT
+ * for this lookup but the next lookup will succeed
+ * because it creates a new vnode (or a racing lookup
+ * created a new vnode already).
+ */
+ error = 0;
+ nretries++;
+ goto retry;
+ }
+ if (!error) {
+ *vn_pp = vn_p;
}
- if ( !error)
- *vn_pp = vn_p;
goto out;
}
- /*
- * If we get here, then we've beaten any deletes;
+ /*
+ * 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);
+ msleep(&dnp->dn_lflags, &devfs_mutex, PRIBIO, 0, 0);
goto retry;
}
dnp->dn_lflags |= DN_CREATE;
switch (dnp->dn_type) {
- case DEV_SLNK:
- vtype = VLNK;
- break;
- case DEV_DIR:
- if (dnp->dn_typeinfo.Dir.parent == dnp) {
- markroot = 1;
- }
- vtype = VDIR;
- break;
- case DEV_BDEV:
- case DEV_CDEV:
- vtype = (dnp->dn_type == DEV_BDEV) ? VBLK : VCHR;
- break;
+ case DEV_SLNK:
+ vtype = VLNK;
+ break;
+ case DEV_DIR:
+ if (dnp->dn_typeinfo.Dir.parent == dnp) {
+ markroot = 1;
+ }
+ vtype = VDIR;
+ break;
+ case DEV_BDEV:
+ case DEV_CDEV:
+ vtype = (dnp->dn_type == DEV_BDEV) ? VBLK : VCHR;
+ break;
#if FDESC
- case DEV_DEVFD:
- vtype = VDIR;
- break;
+ case DEV_DEVFD:
+ vtype = VDIR;
+ break;
#endif /* FDESC */
}
vfsp.vnfs_mp = dnp->dn_dvm->mount;
vfsp.vnfs_fsnode = dnp;
vfsp.vnfs_cnp = 0;
vfsp.vnfs_vops = *(dnp->dn_ops);
-
+
if (vtype == VBLK || vtype == VCHR) {
/*
* Ask the clone minor number function for a new minor number
* limit has been reached, this function will return -1.
*/
if (dnp->dn_clone != NULL) {
- int n_major = major(dnp->dn_typeinfo.dev);
+ int n_major = major(dnp->dn_typeinfo.dev);
n_minor = (*dnp->dn_clone)(dnp->dn_typeinfo.dev, DEVFS_CLONE_ALLOC);
if (n_minor == -1) {
vfsp.vnfs_rdev = makedev(n_major, n_minor);;
} else {
- vfsp.vnfs_rdev = dnp->dn_typeinfo.dev;
+ vfsp.vnfs_rdev = dnp->dn_typeinfo.dev;
}
} else {
vfsp.vnfs_rdev = 0;
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) {
- vnode_settag(vn_p, VT_DEVFS);
+ vnode_settag(vn_p, VT_DEVFS);
- if ((dnp->dn_clone != NULL) && (dnp->dn_vn != NULLVP) )
- panic("devfs_dntovn: cloning device with a vnode?\n");
+ if ((dnp->dn_clone != NULL) && (dnp->dn_vn != NULLVP)) {
+ panic("devfs_dntovn: cloning device with a vnode?\n");
+ }
- *vn_pp = vn_p;
+ *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);
+ /*
+ * 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;
- }
+ /*
+ * 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
* 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);
+ (void)(*dnp->dn_clone)(dnp->dn_typeinfo.dev, DEVFS_CLONE_FREE);
}
dnp->dn_lflags &= ~DN_CREATE;
}
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.
* while the devfs lock is not held.
*/
void
-devfs_ref_node(devnode_t *dnp)
+devfs_ref_node(devnode_t *dnp)
{
- dnp->dn_refcount++;
+ os_ref_retain_locked_raw(&dnp->dn_refcount, &devfs_refgrp);
}
/*
- * Release a reference on a devnode. If the devnode is marked for
- * free and the refcount is dropped to zero, do the free.
+ * Release a reference on a devnode. If the devnode is marked for
+ * free and the refcount is dropped to one, do the free.
*/
-void
+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)) {
+ os_ref_count_t rc = os_ref_release_locked_raw(&dnp->dn_refcount, &devfs_refgrp);
+ if (rc < 1) {
+ panic("devfs_rele_node: devnode without a refcount!\n");
+ } else if ((rc == 1) && (dnp->dn_lflags & DN_DELETE)) {
+ /* release final reference from dev_add_node */
+ (void) os_ref_release_locked_raw(&dnp->dn_refcount, &devfs_refgrp);
devnode_free(dnp);
}
-
}
/***********************************************************************
- * add a whole device, with no prototype.. make name element and node
- * Used for adding the original device entries
- *
- * called with DEVFS_LOCK held
- ***********************************************************************/
+* add a whole device, with no prototype.. make name element and node
+* Used for adding the original device entries
+*
+* called with DEVFS_LOCK held
+***********************************************************************/
int
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 * proto, struct devfsmount *dvm, devdirent_t * *nm_pp)
{
- devnode_t * dnp;
- int error = 0;
+ devnode_t * dnp;
+ int error = 0;
- if ((error = dev_add_node(type, typeinfo, proto, &dnp,
- (parent?parent->dn_dvm:dvm))) != 0)
- {
+ if ((error = dev_add_node(type, typeinfo, proto, &dnp,
+ (parent?parent->dn_dvm:dvm))) != 0) {
printf("devfs: %s: base node allocation failed (Errno=%d)\n",
- name,error);
+ name, error);
return error;
}
- if ((error = dev_add_name(name ,parent ,NULL, dnp, nm_pp)) != 0)
- {
+ if ((error = dev_add_name(name, parent, NULL, dnp, nm_pp)) != 0) {
devfs_dn_free(dnp); /* 1->0 for dir, 0->(-1) for other */
printf("devfs: %s: name slot allocation failed (Errno=%d)\n",
- name,error);
-
+ name, error);
}
return error;
}
static void
-devfs_bulk_notify(devfs_event_log_t delp)
+devfs_bulk_notify(devfs_event_log_t delp)
{
uint32_t i;
for (i = 0; i < delp->del_used; i++) {
}
}
-static void
+static void
devfs_record_event(devfs_event_log_t delp, devnode_t *dnp, uint32_t events)
{
if (delp->del_used >= delp->del_max) {
}
static int
-devfs_init_event_log(devfs_event_log_t delp, uint32_t count, devfs_vnode_event_t buf)
+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) {
+ 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;
* Create a device node with the given pathname in the devfs namespace.
*
* Parameters:
- * dev - the dev_t value to associate
+ * dev - the dev_t value to associate
* chrblk - block or character device (DEVFS_CHAR or DEVFS_BLOCK)
* uid, gid - ownership
* perms - permissions
*/
void *
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, ...)
+ gid_t gid, int perms, int (*clone)(dev_t dev, int action),
+ const char *fmt, ...)
{
- devdirent_t * new_dev = NULL;
- devfstype_t type;
+ devdirent_t * new_dev = NULL;
+ 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;
+ case DEVFS_CHAR:
+ type = DEV_CDEV;
+ break;
+ case DEVFS_BLOCK:
+ type = DEV_BDEV;
+ break;
+ default:
+ goto out;
}
va_start(ap, fmt);
* Create a device node with the given pathname in the devfs namespace.
*
* Parameters:
- * dev - the dev_t value to associate
+ * dev - the dev_t value to associate
* chrblk - block or character device (DEVFS_CHAR or DEVFS_BLOCK)
* uid, gid - ownership
* perms - permissions
*/
void *
devfs_make_node(dev_t dev, int chrblk, uid_t uid,
- gid_t gid, int perms, const char *fmt, ...)
+ gid_t gid, int perms, const char *fmt, ...)
{
- devdirent_t * new_dev = NULL;
+ devdirent_t * new_dev = NULL;
devfstype_t type;
va_list ap;
- if (chrblk != DEVFS_CHAR && chrblk != DEVFS_BLOCK)
+ if (chrblk != DEVFS_CHAR && chrblk != DEVFS_BLOCK) {
goto out;
+ }
type = (chrblk == DEVFS_BLOCK ? DEV_BDEV : DEV_CDEV);
va_start(ap, fmt);
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)
+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;
+ devdirent_t * new_dev = NULL;
devnode_t * dnp;
- devnode_type_t typeinfo;
+ devnode_type_t typeinfo;
- char *name, buf[256]; /* XXX */
- const char *path;
+ char *name, buf[256]; /* XXX */
+ const char *path;
#if CONFIG_MACF
char buff[sizeof(buf)];
#endif
- int i;
- uint32_t log_count;
+ size_t i;
+ uint32_t log_count;
struct devfs_event_log event_log;
struct devfs_vnode_event stackbuf[NUM_STACK_ENTRIES];
- int need_free = 0;
+ int need_free = 0;
vsnprintf(buf, sizeof(buf), fmt, ap);
#if CONFIG_MACF
bcopy(buf, buff, sizeof(buff));
- buff[sizeof(buff)-1] = 0;
+ buff[sizeof(buff) - 1] = 0;
#endif
name = NULL;
- for(i=strlen(buf); i>0; i--)
- if(buf[i] == '/') {
- name=&buf[i];
- buf[i]=0;
+ for (i = strlen(buf); i > 0; i--) {
+ if (buf[i] == '/') {
+ name = &buf[i];
+ buf[i] = 0;
break;
}
+ }
if (name) {
*name++ = '\0';
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, DEVFS_CREATE, &dnp, &event_log) == 0) {
- typeinfo.dev = dev;
- 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;
- new_dev->de_dnp->dn_clone = clone;
+ typeinfo.dev = dev;
+ 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;
+ new_dev->de_dnp->dn_clone = clone;
#if CONFIG_MACF
- mac_devfs_label_associate_device(dev, new_dev->de_dnp, buff);
+ mac_devfs_label_associate_device(dev, new_dev->de_dnp, buff);
#endif
- devfs_propogate(dnp->dn_typeinfo.Dir.myname, new_dev, &event_log);
- }
+ devfs_propogate(dnp->dn_typeinfo.Dir.myname, new_dev, &event_log);
+ }
}
out:
int
devfs_make_link(void *original, char *fmt, ...)
{
- devdirent_t * new_dev = NULL;
- devdirent_t * orig = (devdirent_t *) original;
- devnode_t * dirnode; /* devnode for parent directory */
+ 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;
+ uint32_t log_count;
va_list ap;
char *p, buf[256]; /* XXX */
- int i;
+ size_t i;
DEVFS_LOCK();
p = NULL;
- for(i=strlen(buf); i>0; i--) {
- if(buf[i] == '/') {
- p=&buf[i];
- buf[i]=0;
- break;
+ for (i = strlen(buf); i > 0; i--) {
+ if (buf[i] == '/') {
+ p = &buf[i];
+ buf[i] = 0;
+ break;
}
}
-
- /*
- * One slot for each directory, one for each devnode
- * whose link count changes
+
+ /*
+ * One slot for each directory, one for each devnode
+ * whose link count changes
*/
log_count = devfs_nmountplanes * 2;
wrongsize:
}
if (p) {
- *p++ = '\0';
+ *p++ = '\0';
if (dev_finddir(buf, NULL, DEVFS_CREATE, &dirnode, &event_log)
- || dev_add_name(p, dirnode, NULL, orig->de_dnp, &new_dev))
- goto fail;
+ || dev_add_name(p, dirnode, NULL, orig->de_dnp, &new_dev)) {
+ goto fail;
+ }
} else {
- if (dev_finddir("", NULL, DEVFS_CREATE, &dirnode, &event_log)
- || dev_add_name(buf, dirnode, NULL, orig->de_dnp, &new_dev))
- goto fail;
+ 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, &event_log);
fail:
devfs_bulk_notify(&event_log);
devfs_release_event_log(&event_log, 1);
- return ((new_dev != NULL) ? 0 : -1);
+ return (new_dev != NULL) ? 0 : -1;
}
projects / apple / xnu.git / blobdiff