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-rw-r--r--fs/notify/group.c40
1 files changed, 38 insertions, 2 deletions
diff --git a/fs/notify/group.c b/fs/notify/group.c
index 9e9eb406afd..ada913fd4f7 100644
--- a/fs/notify/group.c
+++ b/fs/notify/group.c
@@ -89,10 +89,27 @@ void fsnotify_recalc_group_mask(struct fsnotify_group *group)
void fsnotify_add_vfsmount_group(struct fsnotify_group *group)
{
+ struct fsnotify_group *group_iter;
+ unsigned int priority = group->priority;
+
mutex_lock(&fsnotify_grp_mutex);
- if (!group->on_vfsmount_group_list)
+ if (!group->on_vfsmount_group_list) {
+ list_for_each_entry(group_iter, &fsnotify_vfsmount_groups,
+ vfsmount_group_list) {
+ /* insert in front of this one? */
+ if (priority < group_iter->priority) {
+ /* list_add_tail() insert in front of group_iter */
+ list_add_tail_rcu(&group->inode_group_list,
+ &group_iter->inode_group_list);
+ goto out;
+ }
+ }
+
+ /* apparently we need to be the last entry */
list_add_tail_rcu(&group->vfsmount_group_list, &fsnotify_vfsmount_groups);
+ }
+out:
group->on_vfsmount_group_list = 1;
mutex_unlock(&fsnotify_grp_mutex);
@@ -100,10 +117,27 @@ void fsnotify_add_vfsmount_group(struct fsnotify_group *group)
void fsnotify_add_inode_group(struct fsnotify_group *group)
{
+ struct fsnotify_group *group_iter;
+ unsigned int priority = group->priority;
+
mutex_lock(&fsnotify_grp_mutex);
- if (!group->on_inode_group_list)
+ /* add to global group list, priority 0 first, UINT_MAX last */
+ if (!group->on_inode_group_list) {
+ list_for_each_entry(group_iter, &fsnotify_inode_groups,
+ inode_group_list) {
+ if (priority < group_iter->priority) {
+ /* list_add_tail() insert in front of group_iter */
+ list_add_tail_rcu(&group->inode_group_list,
+ &group_iter->inode_group_list);
+ goto out;
+ }
+ }
+
+ /* apparently we need to be the last entry */
list_add_tail_rcu(&group->inode_group_list, &fsnotify_inode_groups);
+ }
+out:
group->on_inode_group_list = 1;
mutex_unlock(&fsnotify_grp_mutex);
@@ -226,6 +260,8 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops)
spin_lock_init(&group->mark_lock);
INIT_LIST_HEAD(&group->marks_list);
+ group->priority = UINT_MAX;
+
group->ops = ops;
return group;