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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/sysctl.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/sysctl.h')
-rw-r--r--include/linux/sysctl.h11
1 files changed, 10 insertions, 1 deletions
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 5b5f434ac9a0..ce19a2aa0b21 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -61,7 +61,8 @@ enum
61 CTL_DEV=7, /* Devices */ 61 CTL_DEV=7, /* Devices */
62 CTL_BUS=8, /* Busses */ 62 CTL_BUS=8, /* Busses */
63 CTL_ABI=9, /* Binary emulation */ 63 CTL_ABI=9, /* Binary emulation */
64 CTL_CPU=10 /* CPU stuff (speed scaling, etc) */ 64 CTL_CPU=10, /* CPU stuff (speed scaling, etc) */
65 CTL_INOTIFY=11 /* Inotify */
65}; 66};
66 67
67/* CTL_BUS names: */ 68/* CTL_BUS names: */
@@ -70,6 +71,14 @@ enum
70 CTL_BUS_ISA=1 /* ISA */ 71 CTL_BUS_ISA=1 /* ISA */
71}; 72};
72 73
74/* CTL_INOTIFY names: */
75enum
76{
77 INOTIFY_MAX_USER_DEVICES=1, /* max number of inotify device instances per user */
78 INOTIFY_MAX_USER_WATCHES=2, /* max number of inotify watches per user */
79 INOTIFY_MAX_QUEUED_EVENTS=3 /* Max number of queued events per inotify device instance */
80};
81
73/* CTL_KERN names: */ 82/* CTL_KERN names: */
74enum 83enum
75{ 84{