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authorRobert Love <rml@novell.com>2005-07-12 17:06:03 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-12 23:38:38 -0400
commit0eeca28300df110bd6ed54b31193c83b87921443 (patch)
tree7db42d8a18d80eca538f5b7d25e0532b8fa38b85 /include/linux/sched.h
parentbd4c625c061c2a38568d0add3478f59172455159 (diff)
[PATCH] inotify
inotify is intended to correct the deficiencies of dnotify, particularly its inability to scale and its terrible user interface: * dnotify requires the opening of one fd per each directory that you intend to watch. This quickly results in too many open files and pins removable media, preventing unmount. * dnotify is directory-based. You only learn about changes to directories. Sure, a change to a file in a directory affects the directory, but you are then forced to keep a cache of stat structures. * dnotify's interface to user-space is awful. Signals? inotify provides a more usable, simple, powerful solution to file change notification: * inotify's interface is a system call that returns a fd, not SIGIO. You get a single fd, which is select()-able. * inotify has an event that says "the filesystem that the item you were watching is on was unmounted." * inotify can watch directories or files. Inotify is currently used by Beagle (a desktop search infrastructure), Gamin (a FAM replacement), and other projects. See Documentation/filesystems/inotify.txt. Signed-off-by: Robert Love <rml@novell.com> Cc: John McCutchan <ttb@tentacle.dhs.org> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index ff48815bd3a2..dec5827c7742 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -410,6 +410,10 @@ struct user_struct {
410 atomic_t processes; /* How many processes does this user have? */ 410 atomic_t processes; /* How many processes does this user have? */
411 atomic_t files; /* How many open files does this user have? */ 411 atomic_t files; /* How many open files does this user have? */
412 atomic_t sigpending; /* How many pending signals does this user have? */ 412 atomic_t sigpending; /* How many pending signals does this user have? */
413#ifdef CONFIG_INOTIFY
414 atomic_t inotify_watches; /* How many inotify watches does this user have? */
415 atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
416#endif
413 /* protected by mq_lock */ 417 /* protected by mq_lock */
414 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 418 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
415 unsigned long locked_shm; /* How many pages of mlocked shm ? */ 419 unsigned long locked_shm; /* How many pages of mlocked shm ? */