[PATCH 08/10] fsnotify: introduce locked versions of fsnotify_add_mark() and fsnotify_remove_mark()

[Andy Whitcroft]

From: Lino Sanfilippo <LinoSanfilippo at gmx.de>

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 at gmx.de>
Signed-off-by: Eric Paris <eparis at redhat.com>

(cherry-picked from commit fb634e66bbe4119fe5074ecf89630cdb361041d6 git://git.infradead.org/users/eparis/notify.git)
BugLink: http://bugs.launchpad.net/bugs/922906
Signed-off-by: Andy Whitcroft <apw at canonical.com>
---
 fs/notify/mark.c                 |   42 +++++++++++++++++++++++++++-----------
 include/linux/fsnotify_backend.h |    4 ++++
 2 files changed, 34 insertions(+), 12 deletions(-)

diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 716b7e2..37962c7 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -122,18 +122,18 @@ EXPORT_SYMBOL(fsnotify_put_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;
 	}
 
@@ -150,6 +150,8 @@ 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);
@@ -185,6 +187,16 @@ 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);
 }
 EXPORT_SYMBOL(fsnotify_destroy_mark);
 
@@ -210,14 +222,15 @@ 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!!!!
@@ -225,8 +238,6 @@ 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;
 
@@ -252,8 +263,6 @@ 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);
 
@@ -266,7 +275,6 @@ 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);
@@ -277,6 +285,16 @@ err:
 }
 EXPORT_SYMBOL(fsnotify_add_mark);
 
+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 5b33a85..4f205fa 100644
--- 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 */
-- 
1.7.9.5