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author | Al Viro <viro@zeniv.linux.org.uk> | 2007-06-07 18:21:44 +0200 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2007-10-21 08:37:32 +0200 |
commit | b9efe8a234ad874a049460417c54680338f96360 (patch) | |
tree | bf058a173388d825bbc74225fe08f87ad27adcdc /fs/inotify.c | |
parent | [PATCH] new helpers - collect_mounts() and release_collected_mounts() (diff) | |
download | linux-b9efe8a234ad874a049460417c54680338f96360.tar.xz linux-b9efe8a234ad874a049460417c54680338f96360.zip |
[PATCH] new helper - inotify_clone_watch()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/inotify.c')
-rw-r--r-- | fs/inotify.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/fs/inotify.c b/fs/inotify.c index 7457501b9565..4b2469bb6554 100644 --- a/fs/inotify.c +++ b/fs/inotify.c @@ -667,6 +667,41 @@ out: EXPORT_SYMBOL_GPL(inotify_add_watch); /** + * inotify_clone_watch - put the watch next to existing one + * @old: already installed watch + * @new: new watch + * + * Caller must hold the inotify_mutex of inode we are dealing with; + * it is expected to remove the old watch before unlocking the inode. + */ +s32 inotify_clone_watch(struct inotify_watch *old, struct inotify_watch *new) +{ + struct inotify_handle *ih = old->ih; + int ret = 0; + + new->mask = old->mask; + new->ih = ih; + + mutex_lock(&ih->mutex); + + /* Initialize a new watch */ + ret = inotify_handle_get_wd(ih, new); + if (unlikely(ret)) + goto out; + ret = new->wd; + + get_inotify_handle(ih); + + new->inode = igrab(old->inode); + + list_add(&new->h_list, &ih->watches); + list_add(&new->i_list, &old->inode->inotify_watches); +out: + mutex_unlock(&ih->mutex); + return ret; +} + +/** * inotify_rm_wd - remove a watch from an inotify instance * @ih: inotify handle * @wd: watch descriptor to remove |