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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 /fs/sysfs
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 'fs/sysfs')
-rw-r--r--fs/sysfs/file.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index d72c1ce48559..335288b9be0f 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -3,7 +3,7 @@
3 */ 3 */
4 4
5#include <linux/module.h> 5#include <linux/module.h>
6#include <linux/dnotify.h> 6#include <linux/fsnotify.h>
7#include <linux/kobject.h> 7#include <linux/kobject.h>
8#include <linux/namei.h> 8#include <linux/namei.h>
9#include <asm/uaccess.h> 9#include <asm/uaccess.h>
@@ -391,9 +391,6 @@ int sysfs_create_file(struct kobject * kobj, const struct attribute * attr)
391 * sysfs_update_file - update the modified timestamp on an object attribute. 391 * sysfs_update_file - update the modified timestamp on an object attribute.
392 * @kobj: object we're acting for. 392 * @kobj: object we're acting for.
393 * @attr: attribute descriptor. 393 * @attr: attribute descriptor.
394 *
395 * Also call dnotify for the dentry, which lots of userspace programs
396 * use.
397 */ 394 */
398int sysfs_update_file(struct kobject * kobj, const struct attribute * attr) 395int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
399{ 396{
@@ -408,7 +405,7 @@ int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
408 if (victim->d_inode && 405 if (victim->d_inode &&
409 (victim->d_parent->d_inode == dir->d_inode)) { 406 (victim->d_parent->d_inode == dir->d_inode)) {
410 victim->d_inode->i_mtime = CURRENT_TIME; 407 victim->d_inode->i_mtime = CURRENT_TIME;
411 dnotify_parent(victim, DN_MODIFY); 408 fsnotify_modify(victim);
412 409
413 /** 410 /**
414 * Drop reference from initial sysfs_get_dentry(). 411 * Drop reference from initial sysfs_get_dentry().