/*
* Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_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 Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * @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
+ * 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.
+ *
+ * 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.
- *
- * @APPLE_LICENSE_HEADER_END@
+ * 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.
- *
+ *
* devfsdefs.h
*/
+/*
+ * NOTICE: This file was modified by McAfee Research in 2004 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/appleapiopts.h>
+__BEGIN_DECLS
#ifdef __APPLE_API_PRIVATE
-#define DEVMAXNAMESIZE 32 /* XXX */
-#define DEVMAXPATHSIZE 128 /* XXX */
+#define DEVMAXNAMESIZE 32 /* XXX */
+#define DEVMAXPATHSIZE 128 /* XXX */
typedef enum {
- DEV_DIR,
- DEV_BDEV,
- DEV_CDEV,
- DEV_SLNK,
+ DEV_DIR,
+ DEV_BDEV,
+ DEV_CDEV,
+ DEV_SLNK,
+#if FDESC
+ DEV_DEVFD
+#endif /* FDESC */
} devfstype_t;
-extern int (**devfs_vnodeop_p)(void *); /* our own vector array for dirs */
-extern int (**devfs_spec_vnodeop_p)(void *); /* our own vector array for devs */
-extern struct vfsops devfs_vfsops;
+extern int(**devfs_vnodeop_p)(void *); /* our own vector array for dirs */
+extern int(**devfs_spec_vnodeop_p)(void *); /* our own vector array for devs */
+extern const struct vfsops devfs_vfsops;
-typedef struct devnode devnode_t;
-typedef struct devdirent devdirent_t;
-typedef union devnode_type devnode_type_t;
+typedef struct devnode devnode_t;
+typedef struct devdirent devdirent_t;
+typedef union devnode_type devnode_type_t;
struct devfs_stats {
- int nodes;
- int entries;
- int mounts;
- int stringspace;
+ int nodes;
+ int entries;
+ int mounts;
+ int stringspace;
};
union devnode_type {
- dev_t dev;
- struct {
- devdirent_t * dirlist;
- devdirent_t * * dirlast;
- devnode_t * parent;
- devdirent_t * myname; /* my entry in .. */
- int entrycount;
- }Dir;
- struct {
- char * name; /* must be allocated separately */
- int namelen;
- }Slnk;
+ dev_t dev;
+ struct {
+ devdirent_t * dirlist;
+ devdirent_t * * dirlast;
+ devnode_t * parent;
+ devdirent_t * myname; /* my entry in .. */
+ int entrycount;
+ }Dir;
+ struct {
+ char * name;/* must be allocated separately */
+ int namelen;
+ }Slnk;
};
-#define DN_ACCESS 0x0001 /* Access time update request. */
-#define DN_CHANGE 0x0002 /* Inode change time update request. */
-#define DN_UPDATE 0x0004 /* Modification time update request. */
-#define DN_MODIFIED 0x0008 /* Inode has been modified. */
-#define DN_RENAME 0x0010 /* Inode is being renamed. */
-
-struct devnode
-{
- devfstype_t dn_type;
- int dn_flags;
- u_short dn_mode;
- uid_t dn_uid;
- gid_t dn_gid;
- struct timespec dn_atime;/* time of last access */
- struct timespec dn_mtime;/* time of last modification */
- struct timespec dn_ctime;/* time file changed */
- int (***dn_ops)(void *);/* yuk... pointer to pointer(s) to funcs */
- int dn_links;/* how many file links does this node have? */
- struct devfsmount * dn_dvm; /* the mount structure for this 'plane' */
- struct vnode * dn_vn; /* address of last vnode that represented us */
- int dn_len; /* of any associated info (e.g. dir data) */
- devdirent_t * dn_linklist;/* circular list of hardlinks to this node */
- devdirent_t * dn_last_lookup; /* name I was last looked up from */
- devnode_t * dn_nextsibling; /* the list of equivalent nodes */
- devnode_t * * dn_prevsiblingp;/* backpointer for the above */
- devnode_type_t dn_typeinfo;
- int dn_delete; /* mark for deletion */
+#define DEV_MAX_VNODE_RETRY 8 /* Max number of retries when we try to
+ * get a vnode for the devnode */
+struct devnode {
+ devfstype_t dn_type;
+ /*
+ * Number of vnodes that point to this devnode. Note, we do not
+ * add another reference for a lookup which finds an existing
+ * vnode; a reference is added when a vnode is created and removed
+ * when a vnode is reclaimed. A devnode will not be freed while
+ * there are outstanding references. A refcount can be added to
+ * prevent the free of a devnode in situations where there is not
+ * guaranteed to be a vnode holding a ref, but it is important to
+ * make sure that a deferred delete eventually happens if it is
+ * blocked behind that reference.
+ */
+ os_ref_atomic_t dn_refcount;
+ u_short dn_mode;
+ uid_t dn_uid;
+ gid_t dn_gid;
+ struct timespec dn_atime;/* time of last access */
+ struct timespec dn_mtime;/* time of last modification */
+ struct timespec dn_ctime;/* time file changed */
+ int(***dn_ops)(void *);/* yuk... pointer to pointer(s) to funcs */
+ int dn_links;/* how many file links does this node have? */
+ struct devfsmount * dn_dvm; /* the mount structure for this 'plane' */
+ struct vnode * dn_vn;/* address of last vnode that represented us */
+ int dn_len;/* of any associated info (e.g. dir data) */
+ devdirent_t * dn_linklist;/* circular list of hardlinks to this node */
+ devnode_t * dn_nextsibling;/* the list of equivalent nodes */
+ devnode_t * * dn_prevsiblingp;/* backpointer for the above */
+ devnode_type_t dn_typeinfo;
+ int dn_change;
+ int dn_update;
+ int dn_access;
+ int dn_lflags;
+ ino_t dn_ino;
+ int (*dn_clone)(dev_t dev, int action);/* get minor # */
+ struct label * dn_label; /* security label */
};
-struct devdirent
-{
- /*-----------------------directory entry fields-------------*/
- char de_name[DEVMAXNAMESIZE];
- devnode_t * de_dnp; /* the "inode" (devnode) pointer */
- devnode_t * de_parent; /* backpointer to the directory itself */
- devdirent_t * de_next; /* next object in this directory */
- devdirent_t * *de_prevp; /* previous pointer in directory linked list */
- devdirent_t * de_nextlink; /* next hardlink to this node */
- devdirent_t * *de_prevlinkp; /* previous hardlink pointer for this node */
+#define DN_DELETE 0x02
+#define DN_CREATE 0x04
+#define DN_CREATEWAIT 0x08
+
+
+struct devdirent {
+ /*-----------------------directory entry fields-------------*/
+ char de_name[DEVMAXNAMESIZE];
+ devnode_t * de_dnp; /* the "inode" (devnode) pointer */
+ devnode_t * de_parent; /* backpointer to the directory itself */
+ devdirent_t * de_next; /* next object in this directory */
+ devdirent_t * *de_prevp; /* previous pointer in directory linked list */
+ devdirent_t * de_nextlink;/* next hardlink to this node */
+ devdirent_t * *de_prevlinkp;/* previous hardlink pointer for this node */
};
-extern devdirent_t * dev_root;
-extern struct lock__bsd__ devfs_lock;
-extern struct devfs_stats devfs_stats;
+extern devdirent_t * dev_root;
+extern struct devfs_stats devfs_stats;
+extern lck_mtx_t devfs_mutex;
+extern lck_mtx_t devfs_attr_mutex;
/*
* Rules for front nodes:
* DEVFS specific per/mount information, used to link a monted fs to a
* particular 'plane' of front nodes.
*/
-struct devfsmount
-{
- struct mount * mount; /* vfs mount struct for this fs */
- devdirent_t * plane_root;/* the root of this 'plane' */
+struct devfsmount {
+ struct mount * mount;/* vfs mount struct for this fs */
+ devdirent_t * plane_root;/* the root of this 'plane' */
};
/*
*/
#include <sys/lock.h>
#include <miscfs/devfs/devfs_proto.h>
+#include <libkern/OSAtomic.h> /* required for OSAddAtomic() */
//#define HIDDEN_MOUNTPOINT 1
/* misc */
-#define M_DEVFSNAME M_DEVFS
-#define M_DEVFSNODE M_DEVFS
-#define M_DEVFSMNT M_DEVFS
+#define M_DEVFSNAME M_DEVFS
+#define M_DEVFSNODE M_DEVFS
+#define M_DEVFSMNT M_DEVFS
-static __inline__ void
-getnanotime(struct timespec * t_p)
-{
- struct timeval tv;
+#define VTODN(vp) ((devnode_t *)(vp)->v_data)
- microtime(&tv);
- t_p->tv_sec = tv.tv_sec;
- t_p->tv_nsec = tv.tv_usec * 1000;
- return;
-}
+#define DEVFS_LOCK() lck_mtx_lock(&devfs_mutex)
+#define DEVFS_UNLOCK() lck_mtx_unlock(&devfs_mutex)
-#define VTODN(vp) ((devnode_t *)(vp)->v_data)
-extern void cache_purge(struct vnode *vp); /* vfs_cache.c */
-
-static __inline__ int
-DEVFS_LOCK(struct proc * p)
-{
- return (lockmgr(&devfs_lock, LK_EXCLUSIVE, NULL, p));
-}
-
-static __inline__ int
-DEVFS_UNLOCK(struct proc * p)
-{
- return (lockmgr(&devfs_lock, LK_RELEASE, NULL, p));
-}
+#define DEVFS_ATTR_LOCK_SPIN() lck_mtx_lock_spin(&devfs_attr_mutex);
+#define DEVFS_ATTR_UNLOCK() lck_mtx_unlock(&devfs_attr_mutex);
+/*
+ * XXX all the (SInt32 *) casts below assume sizeof(int) == sizeof(long)
+ */
static __inline__ void
-DEVFS_INCR_ENTRIES()
+DEVFS_INCR_ENTRIES(void)
{
- devfs_stats.entries++;
+ OSAddAtomic(1, &devfs_stats.entries);
}
static __inline__ void
-DEVFS_DECR_ENTRIES()
+DEVFS_DECR_ENTRIES(void)
{
- devfs_stats.entries--;
+ OSAddAtomic(-1, &devfs_stats.entries);
}
static __inline__ void
-DEVFS_INCR_NODES()
+DEVFS_INCR_NODES(void)
{
- devfs_stats.nodes++;
+ OSAddAtomic(1, &devfs_stats.nodes);
}
static __inline__ void
-DEVFS_DECR_NODES()
+DEVFS_DECR_NODES(void)
{
- devfs_stats.nodes--;
+ OSAddAtomic(-1, &devfs_stats.nodes);
}
static __inline__ void
-DEVFS_INCR_MOUNTS()
+DEVFS_INCR_MOUNTS(void)
{
- devfs_stats.mounts++;
+ OSAddAtomic(1, &devfs_stats.mounts);
}
static __inline__ void
-DEVFS_DECR_MOUNTS()
+DEVFS_DECR_MOUNTS(void)
{
- devfs_stats.mounts--;
+ OSAddAtomic(-1, &devfs_stats.mounts);
}
static __inline__ void
DEVFS_INCR_STRINGSPACE(int space)
{
- devfs_stats.stringspace += space;
+ OSAddAtomic(space, &devfs_stats.stringspace);
}
static __inline__ void
DEVFS_DECR_STRINGSPACE(int space)
{
- devfs_stats.stringspace -= space;
- if (devfs_stats.stringspace < 0) {
- printf("DEVFS_DECR_STRINGSPACE: (%d - %d < 0)\n",
- devfs_stats.stringspace + space, space);
- devfs_stats.stringspace = 0;
- }
+ OSAddAtomic(-space, &devfs_stats.stringspace);
}
-static __inline__ void
-dn_times(devnode_t * dnp, struct timeval t1, struct timeval t2)
-{
- if (dnp->dn_flags & (DN_ACCESS | DN_CHANGE | DN_UPDATE)) {
- if (dnp->dn_flags & DN_ACCESS) {
- dnp->dn_atime.tv_sec = t1.tv_sec;
- dnp->dn_atime.tv_nsec = t1.tv_usec * 1000;
- }
- if (dnp->dn_flags & DN_UPDATE) {
- dnp->dn_mtime.tv_sec = t2.tv_sec;
- dnp->dn_mtime.tv_nsec = t2.tv_usec * 1000;
- }
- if (dnp->dn_flags & DN_CHANGE) {
- dnp->dn_ctime.tv_sec = time.tv_sec;
- dnp->dn_ctime.tv_nsec = time.tv_usec * 1000;
- }
- dnp->dn_flags &= ~(DN_ACCESS | DN_CHANGE | DN_UPDATE);
- }
- return;
-}
+/*
+ * Access, change, and modify times are protected by a separate lock,
+ * which allows tty times to be updated (no more than once per second)
+ * in the I/O path without too much fear of contention.
+ *
+ * For getattr, update times to current time if the last update was recent;
+ * preserve legacy behavior that frequent stats can yield sub-second resolutions.
+ * If the last time is old, however, we know that the event that triggered
+ * the need for an update was no more than 1s after the last update. In that case,
+ * use (last update + 1s) as the time, avoiding the illusion that last update happened
+ * much later than it really did.
+ */
+#define DEVFS_LAZY_UPDATE_SECONDS 1
+
+#define DEVFS_UPDATE_CHANGE 0x1
+#define DEVFS_UPDATE_MOD 0x2
+#define DEVFS_UPDATE_ACCESS 0x4
static __inline__ void
dn_copy_times(devnode_t * target, devnode_t * source)
{
- target->dn_atime = source->dn_atime;
- target->dn_mtime = source->dn_mtime;
- target->dn_ctime = source->dn_ctime;
- return;
+ DEVFS_ATTR_LOCK_SPIN();
+ target->dn_atime = source->dn_atime;
+ target->dn_mtime = source->dn_mtime;
+ target->dn_ctime = source->dn_ctime;
+ DEVFS_ATTR_UNLOCK();
+ return;
}
+
+#ifdef BSD_KERNEL_PRIVATE
+int devfs_make_symlink(devnode_t *dir_p, char *name, int mode, char *target, devdirent_t **newent);
+#endif /* BSD_KERNEL_PRIVATE */
+
#endif /* __APPLE_API_PRIVATE */
+
+__END_DECLS
+
#endif /* __DEVFS_DEVFSDEFS_H__ */
projects / apple / xnu.git / blobdiff