/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright 1997,1998 Julian Elischer. All rights reserved.
*
* 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
* Renamed structures/elements to clarify usage in code.
*/
+#ifndef __DEVFS_DEVFSDEFS_H__
+#define __DEVFS_DEVFSDEFS_H__
+
+#include <sys/appleapiopts.h>
+#include <security/mac.h>
+
+__BEGIN_DECLS
+#ifdef __APPLE_API_PRIVATE
#define DEVMAXNAMESIZE 32 /* XXX */
#define DEVMAXPATHSIZE 128 /* XXX */
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 */
}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. */
-
+#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;
- int dn_flags;
+ /*
+ * 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.
+ */
+ int dn_refcount;
u_short dn_mode;
uid_t dn_uid;
gid_t dn_gid;
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 */
+ 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 */
};
+#define DN_DELETE 0x02
+#define DN_CREATE 0x04
+#define DN_CREATEWAIT 0x08
+
+
struct devdirent
{
/*-----------------------directory entry fields-------------*/
};
extern devdirent_t * dev_root;
-extern struct lock__bsd__ devfs_lock;
extern struct devfs_stats devfs_stats;
+extern lck_mtx_t devfs_mutex;
+extern lck_mtx_t devfs_attr_mutex;
/*
* Rules for front nodes:
*/
#include <sys/lock.h>
#include <miscfs/devfs/devfs_proto.h>
+#include <libkern/OSAtomic.h> /* required for OSAddAtomic() */
//#define HIDDEN_MOUNTPOINT 1
#define M_DEVFSNODE M_DEVFS
#define M_DEVFSMNT M_DEVFS
-static __inline__ void
-getnanotime(struct timespec * t_p)
-{
- struct timeval tv;
-
- microtime(&tv);
- t_p->tv_sec = tv.tv_sec;
- t_p->tv_nsec = tv.tv_usec * 1000;
- return;
-}
-
#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));
-}
+#define DEVFS_LOCK() lck_mtx_lock(&devfs_mutex)
+#define DEVFS_UNLOCK() lck_mtx_unlock(&devfs_mutex)
-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)
{
+ 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