[PATCH 08/14] fanotify: add an extra flag to mark_remove_from_mask that indicates wheather a mark could be destroyed

[Lino Sanfilippo <LinoSanfilippo@xxxxxx>]

This patch adds an extra flag to mark_remove_from_mask() to inform the caller if
all masks of a mark have been cleared and thus the mark could be destroyed.
With this we dont destroy the mark in the function itself any more but let the 
caller decide what to do on mark destruction.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@xxxxxx>
---
 fs/notify/fanotify/fanotify_user.c |   20 +++++++++++++++-----
 1 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 41bfdfd..a8d93e1 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -516,7 +516,8 @@ out:
 
 static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
 					    __u32 mask,
-					    unsigned int flags)
+					    unsigned int flags,
+					    int *destroy)
 {
 	__u32 oldmask;
 	int destroy_mark;
@@ -532,8 +533,7 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
 	destroy_mark = (!fsn_mark->mask && !fsn_mark->ignored_mask);
 	spin_unlock(&fsn_mark->lock);
 
-	if (destroy_mark)
-		fsnotify_destroy_mark(fsn_mark);
+	*destroy = destroy_mark;
 
 	return mask & oldmask;
 }
@@ -544,6 +544,7 @@ static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
 {
 	struct fsnotify_mark *fsn_mark = NULL;
 	__u32 removed;
+	int destroy_mark;
 	int ret;
 
 	mutex_lock(&group->mutex);
@@ -552,7 +553,11 @@ static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
 	if (!fsn_mark)
 		goto err;
 
-	removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags);
+	removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags,
+						 &destroy_mark);
+	if (destroy_mark)
+		fsnotify_destroy_mark(fsn_mark);
+
 	fsnotify_put_mark(fsn_mark);
 	if (removed & mnt->mnt_fsnotify_mask)
 		fsnotify_recalc_vfsmount_mask(mnt);
@@ -569,6 +574,7 @@ static int fanotify_remove_inode_mark(struct fsnotify_group *group,
 {
 	struct fsnotify_mark *fsn_mark = NULL;
 	__u32 removed;
+	int destroy_mark;
 	int ret;
 
 	mutex_lock(&group->mutex);
@@ -577,7 +583,11 @@ static int fanotify_remove_inode_mark(struct fsnotify_group *group,
 	if (!fsn_mark)
 		goto err;
 
-	removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags);
+	removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags,
+						 &destroy_mark);
+	if (destroy_mark)
+		fsnotify_destroy_mark(fsn_mark);
+
 	/* matches the fsnotify_find_inode_mark() */
 	fsnotify_put_mark(fsn_mark);
 	if (removed & inode->i_fsnotify_mask)
-- 
1.5.6.5

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