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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/inode.c
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/inode.c')
-rw-r--r--fs/inode.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/inode.c b/fs/inode.c
index 5bc97507eeaa..96364fae0844 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -21,6 +21,7 @@
21#include <linux/pagemap.h> 21#include <linux/pagemap.h>
22#include <linux/cdev.h> 22#include <linux/cdev.h>
23#include <linux/bootmem.h> 23#include <linux/bootmem.h>
24#include <linux/inotify.h>
24 25
25/* 26/*
26 * This is needed for the following functions: 27 * This is needed for the following functions:
@@ -202,6 +203,10 @@ void inode_init_once(struct inode *inode)
202 INIT_LIST_HEAD(&inode->i_data.i_mmap_nonlinear); 203 INIT_LIST_HEAD(&inode->i_data.i_mmap_nonlinear);
203 spin_lock_init(&inode->i_lock); 204 spin_lock_init(&inode->i_lock);
204 i_size_ordered_init(inode); 205 i_size_ordered_init(inode);
206#ifdef CONFIG_INOTIFY
207 INIT_LIST_HEAD(&inode->inotify_watches);
208 sema_init(&inode->inotify_sem, 1);
209#endif
205} 210}
206 211
207EXPORT_SYMBOL(inode_init_once); 212EXPORT_SYMBOL(inode_init_once);
@@ -351,6 +356,7 @@ int invalidate_inodes(struct super_block * sb)
351 356
352 down(&iprune_sem); 357 down(&iprune_sem);
353 spin_lock(&inode_lock); 358 spin_lock(&inode_lock);
359 inotify_unmount_inodes(&sb->s_inodes);
354 busy = invalidate_list(&sb->s_inodes, &throw_away); 360 busy = invalidate_list(&sb->s_inodes, &throw_away);
355 spin_unlock(&inode_lock); 361 spin_unlock(&inode_lock);
356 362