fsnotify: introduce locked versions of fsnotify_add_mark() and fsnotify_remove_mark()

This patch introduces fsnotify_add_mark_locked() and fsnotify_remove_mark_locked()
which are essentially the same as fsnotify_add_mark() and fsnotify_remove_mark() but
assume that the caller has already taken the groups mark mutex.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
Signed-off-by: Eric Paris <eparis@redhat.com>

diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index b77c833c8d0aab82fb4efca05ed8bf8406fd25f8..f9dda0304a10f71e4141617c69fc485f74183ccf 100644 (file)
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -121,18 +121,18 @@ void fsnotify_put_mark(struct fsnotify_mark *mark)
  * The caller had better be holding a reference to this mark so we don't actually
  * do the final put under the mark->lock
  */
-void fsnotify_destroy_mark(struct fsnotify_mark *mark,
-                          struct fsnotify_group *group)
+void fsnotify_destroy_mark_locked(struct fsnotify_mark *mark,
+                                 struct fsnotify_group *group)
 {
        struct inode *inode = NULL;
 
-       mutex_lock(&group->mark_mutex);
+       BUG_ON(!mutex_is_locked(&group->mark_mutex));
+
        spin_lock(&mark->lock);
 
        /* something else already called this function on this mark */
        if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE)) {
                spin_unlock(&mark->lock);
-               mutex_unlock(&group->mark_mutex);
                return;
        }
 
@@ -149,6 +149,8 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark,
        list_del_init(&mark->g_list);
 
        spin_unlock(&mark->lock);
+
+       /* release lock temporarily */
        mutex_unlock(&group->mark_mutex);
 
        spin_lock(&destroy_lock);
@@ -184,6 +186,16 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark,
         */
 
        atomic_dec(&group->num_marks);
+
+       mutex_lock(&group->mark_mutex);
+}
+
+void fsnotify_destroy_mark(struct fsnotify_mark *mark,
+                          struct fsnotify_group *group)
+{
+       mutex_lock(&group->mark_mutex);
+       fsnotify_destroy_mark_locked(mark, group);
+       mutex_unlock(&group->mark_mutex);
 }
 
 void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask)
@@ -208,14 +220,15 @@ void fsnotify_set_mark_ignored_mask_locked(struct fsnotify_mark *mark, __u32 mas
  * These marks may be used for the fsnotify backend to determine which
  * event types should be delivered to which group.
  */
-int fsnotify_add_mark(struct fsnotify_mark *mark,
-                     struct fsnotify_group *group, struct inode *inode,
-                     struct vfsmount *mnt, int allow_dups)
+int fsnotify_add_mark_locked(struct fsnotify_mark *mark,
+                            struct fsnotify_group *group, struct inode *inode,
+                            struct vfsmount *mnt, int allow_dups)
 {
        int ret = 0;
 
        BUG_ON(inode && mnt);
        BUG_ON(!inode && !mnt);
+       BUG_ON(!mutex_is_locked(&group->mark_mutex));
 
        /*
         * LOCKING ORDER!!!!
@@ -223,8 +236,6 @@ int fsnotify_add_mark(struct fsnotify_mark *mark,
         * mark->lock
         * inode->i_lock
         */
-       mutex_lock(&group->mark_mutex);
-
        spin_lock(&mark->lock);
        mark->flags |= FSNOTIFY_MARK_FLAG_ALIVE;
 
@@ -250,8 +261,6 @@ int fsnotify_add_mark(struct fsnotify_mark *mark,
        fsnotify_set_mark_mask_locked(mark, mark->mask);
        spin_unlock(&mark->lock);
 
-       mutex_unlock(&group->mark_mutex);
-
        if (inode)
                __fsnotify_update_child_dentry_flags(inode);
 
@@ -264,7 +273,6 @@ err:
        atomic_dec(&group->num_marks);
 
        spin_unlock(&mark->lock);
-       mutex_unlock(&group->mark_mutex);
 
        spin_lock(&destroy_lock);
        list_add(&mark->destroy_list, &destroy_list);
@@ -274,6 +282,16 @@ err:
        return ret;
 }
 
+int fsnotify_add_mark(struct fsnotify_mark *mark, struct fsnotify_group *group,
+                     struct inode *inode, struct vfsmount *mnt, int allow_dups)
+{
+       int ret;
+       mutex_lock(&group->mark_mutex);
+       ret = fsnotify_add_mark_locked(mark, group, inode, mnt, allow_dups);
+       mutex_unlock(&group->mark_mutex);
+       return ret;
+}
+
 /*
  * clear any marks in a group in which mark->flags & flags is true
  */

diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 140b4b8a100b86e436acc497e5a3482598fa7486..26c06afa264e6270d63c2152cc40fc02d8915683 100644 (file)
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -408,9 +408,13 @@ extern void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask
 /* attach the mark to both the group and the inode */
 extern int fsnotify_add_mark(struct fsnotify_mark *mark, struct fsnotify_group *group,
                             struct inode *inode, struct vfsmount *mnt, int allow_dups);
+extern int fsnotify_add_mark_locked(struct fsnotify_mark *mark, struct fsnotify_group *group,
+                                   struct inode *inode, struct vfsmount *mnt, int allow_dups);
 /* given a group and a mark, flag mark to be freed when all references are dropped */
 extern void fsnotify_destroy_mark(struct fsnotify_mark *mark,
                                  struct fsnotify_group *group);
+extern void fsnotify_destroy_mark_locked(struct fsnotify_mark *mark,
+                                        struct fsnotify_group *group);
 /* run all the marks in a group, and clear all of the vfsmount marks */
 extern void fsnotify_clear_vfsmount_marks_by_group(struct fsnotify_group *group);
 /* run all the marks in a group, and clear all of the inode marks */