diff options
| author | John McCutchan <ttb@tentacle.dhs.org> | 2005-09-06 15:18:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-07 16:57:39 -0700 |
| commit | 7ea6040b0eff07d3a9a4e2d248ac137c6ad02d42 (patch) | |
| tree | 0a7bcce73c623f89cd5e8a97d2da7946da3293e3 /fs/inotify.c | |
| parent | 8191151d0933d65fb6b659ffbd765479f0f200e1 (diff) | |
[PATCH] inotify: fix event loss on hardlinked files
People have run into a problem when they do this:
watch (file1, all_events);
watch (file2, some_events);
if file2 is a hard link to file1, some events will be missed because by
default we replace the mask. The patch below adds a flag IN_MASK_ADD which
will cause inotify to add to the existing mask if present.
Signed-off-by: John McCutchan <ttb@tentacle.dhs.org>
Signed-off-by: Robert Love <rml@novell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/inotify.c')
| -rw-r--r-- | fs/inotify.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/inotify.c b/fs/inotify.c index 2fd97ef547f..a37e9fb1da5 100644 --- a/fs/inotify.c +++ b/fs/inotify.c @@ -931,6 +931,7 @@ asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask) struct nameidata nd; struct file *filp; int ret, fput_needed; + int mask_add = 0; filp = fget_light(fd, &fput_needed); if (unlikely(!filp)) @@ -953,6 +954,9 @@ asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask) down(&inode->inotify_sem); down(&dev->sem); + if (mask & IN_MASK_ADD) + mask_add = 1; + /* don't let user-space set invalid bits: we don't want flags set */ mask &= IN_ALL_EVENTS; if (unlikely(!mask)) { @@ -966,7 +970,10 @@ asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask) */ old = inode_find_dev(inode, dev); if (unlikely(old)) { - old->mask = mask; + if (mask_add) + old->mask |= mask; + else + old->mask = mask; ret = old->wd; goto out; } |