diff options
| -rw-r--r-- | fs/notify/mark.c | 34 |
1 files changed, 14 insertions, 20 deletions
diff --git a/fs/notify/mark.c b/fs/notify/mark.c index 92e48c70f0f0..3e594ce41010 100644 --- a/fs/notify/mark.c +++ b/fs/notify/mark.c @@ -152,31 +152,15 @@ void fsnotify_destroy_mark_locked(struct fsnotify_mark *mark, BUG(); list_del_init(&mark->g_list); - spin_unlock(&mark->lock); if (inode && (mark->flags & FSNOTIFY_MARK_FLAG_OBJECT_PINNED)) iput(inode); - /* release lock temporarily */ - mutex_unlock(&group->mark_mutex); spin_lock(&destroy_lock); list_add(&mark->g_list, &destroy_list); spin_unlock(&destroy_lock); wake_up(&destroy_waitq); - /* - * We don't necessarily have a ref on mark from caller so the above destroy - * may have actually freed it, unless this group provides a 'freeing_mark' - * function which must be holding a reference. - */ - - /* - * Some groups like to know that marks are being freed. This is a - * callback to the group function to let it know that this mark - * is being freed. - */ - if (group->ops->freeing_mark) - group->ops->freeing_mark(mark, group); /* * __fsnotify_update_child_dentry_flags(inode); @@ -191,8 +175,6 @@ void fsnotify_destroy_mark_locked(struct fsnotify_mark *mark, */ atomic_dec(&group->num_marks); - - mutex_lock_nested(&group->mark_mutex, SINGLE_DEPTH_NESTING); } void fsnotify_destroy_mark(struct fsnotify_mark *mark, @@ -205,7 +187,10 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark, /* * Destroy all marks in the given list. The marks must be already detached from - * the original inode / vfsmount. + * the original inode / vfsmount. Note that we can race with + * fsnotify_clear_marks_by_group_flags(). However we hold a reference to each + * mark so they won't get freed from under us and nobody else touches our + * free_list list_head. */ void fsnotify_destroy_marks(struct list_head *to_free) { @@ -406,7 +391,7 @@ struct fsnotify_mark *fsnotify_find_mark(struct hlist_head *head, } /* - * clear any marks in a group in which mark->flags & flags is true + * Clear any marks in a group in which mark->flags & flags is true. */ void fsnotify_clear_marks_by_group_flags(struct fsnotify_group *group, unsigned int flags) @@ -460,6 +445,7 @@ static int fsnotify_mark_destroy(void *ignored) { struct fsnotify_mark *mark, *next; struct list_head private_destroy_list; + struct fsnotify_group *group; for (;;) { spin_lock(&destroy_lock); @@ -471,6 +457,14 @@ static int fsnotify_mark_destroy(void *ignored) list_for_each_entry_safe(mark, next, &private_destroy_list, g_list) { list_del_init(&mark->g_list); + group = mark->group; + /* + * Some groups like to know that marks are being freed. + * This is a callback to the group function to let it + * know that this mark is being freed. + */ + if (group && group->ops->freeing_mark) + group->ops->freeing_mark(mark, group); fsnotify_put_mark(mark); } |