#include <security/mac.h>
+__BEGIN_DECLS
#ifdef __APPLE_API_PRIVATE
#define DEVMAXNAMESIZE 32 /* XXX */
#define DEVMAXPATHSIZE 128 /* XXX */
DEV_DIR,
DEV_BDEV,
DEV_CDEV,
- DEV_SLNK
+ DEV_SLNK,
+#if FDESC
+ DEV_DEVFD
+#endif /* FDESC */
} devfstype_t;
extern int (**devfs_vnodeop_p)(void *); /* our own vector array for dirs */
}Slnk;
};
+#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;
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;
+ 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_BUSY 0x01
#define DN_DELETE 0x02
#define DN_CREATE 0x04
-#define DN_CREATEWAIT 0x08
+#define DN_CREATEWAIT 0x08
struct devdirent
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:
#define VTODN(vp) ((devnode_t *)(vp)->v_data)
#define DEVFS_LOCK() lck_mtx_lock(&devfs_mutex)
-
#define DEVFS_UNLOCK() lck_mtx_unlock(&devfs_mutex)
+#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(void)
{
- OSAddAtomic(1, (SInt32 *)&devfs_stats.entries);
+ OSAddAtomic(1, &devfs_stats.entries);
}
static __inline__ void
DEVFS_DECR_ENTRIES(void)
{
- OSAddAtomic(-1, (SInt32 *)&devfs_stats.entries);
+ OSAddAtomic(-1, &devfs_stats.entries);
}
static __inline__ void
DEVFS_INCR_NODES(void)
{
- OSAddAtomic(1, (SInt32 *)&devfs_stats.nodes);
+ OSAddAtomic(1, &devfs_stats.nodes);
}
static __inline__ void
DEVFS_DECR_NODES(void)
{
- OSAddAtomic(-1, (SInt32 *)&devfs_stats.nodes);
+ OSAddAtomic(-1, &devfs_stats.nodes);
}
static __inline__ void
DEVFS_INCR_MOUNTS(void)
{
- OSAddAtomic(1, (SInt32 *)&devfs_stats.mounts);
+ OSAddAtomic(1, &devfs_stats.mounts);
}
static __inline__ void
DEVFS_DECR_MOUNTS(void)
{
- OSAddAtomic(-1, (SInt32 *)&devfs_stats.mounts);
+ OSAddAtomic(-1, &devfs_stats.mounts);
}
static __inline__ void
DEVFS_INCR_STRINGSPACE(int space)
{
- OSAddAtomic(space, (SInt32 *)&devfs_stats.stringspace);
+ OSAddAtomic(space, &devfs_stats.stringspace);
}
static __inline__ void
DEVFS_DECR_STRINGSPACE(int space)
{
- OSAddAtomic(-space, (SInt32 *)&devfs_stats.stringspace);
+ OSAddAtomic(-space, &devfs_stats.stringspace);
}
-static __inline__ void
-dn_times(devnode_t * dnp, struct timeval *t1, struct timeval *t2, struct timeval *t3)
-{
- if (dnp->dn_access) {
- dnp->dn_atime.tv_sec = t1->tv_sec;
- dnp->dn_atime.tv_nsec = t1->tv_usec * 1000;
- dnp->dn_access = 0;
- }
- if (dnp->dn_update) {
- dnp->dn_mtime.tv_sec = t2->tv_sec;
- dnp->dn_mtime.tv_nsec = t2->tv_usec * 1000;
- dnp->dn_update = 0;
- }
- if (dnp->dn_change) {
- dnp->dn_ctime.tv_sec = t3->tv_sec;
- dnp->dn_ctime.tv_nsec = t3->tv_usec * 1000;
- dnp->dn_change = 0;
- }
-
- 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