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[PATCH] new helper - inotify_clone_watch()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2007-06-07 12:21:44 -04:00
parent 8aec080945
commit b9efe8a234
2 changed files with 36 additions and 0 deletions
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35
fs/inotify.c
View File

@ -666,6 +666,41 @@ 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

1
include/linux/inotify.h
View File

@ -120,6 +120,7 @@ extern __s32 inotify_find_update_watch(struct inotify_handle *, struct inode *,
u32);
extern __s32 inotify_add_watch(struct inotify_handle *, struct inotify_watch *,
struct inode *, __u32);
extern __s32 inotify_clone_watch(struct inotify_watch *, struct inotify_watch *);
extern int inotify_rm_watch(struct inotify_handle *, struct inotify_watch *);
extern int inotify_rm_wd(struct inotify_handle *, __u32);
extern void inotify_remove_watch_locked(struct inotify_handle *,