[PATCH 2/3] fanotify: dont recalculate a marks mask if only the ignored mask changed

[Lino Sanfilippo]

If removing bits from a marks ignored mask, the concerning inodes/vfsmounts
mask is not affected. So dont recalculate it.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@xxxxxx>
---
 fs/notify/fanotify/fanotify_user.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 03a0dd1..3afd8bb 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -487,7 +487,7 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
 					    unsigned int flags,
 					    int *destroy)
 {
-	__u32 oldmask;
+	__u32 oldmask = 0;
 	__u32 new_mask;
 	__u32 new_ignored;
 
@@ -496,8 +496,8 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
 		oldmask = fsn_mark->mask;
 		fsnotify_set_mark_mask_locked(fsn_mark, (oldmask & ~mask));
 	} else {
-		oldmask = fsn_mark->ignored_mask;
-		fsnotify_set_mark_ignored_mask_locked(fsn_mark, (oldmask & ~mask));
+		__u32 tmask = fsn_mark->ignored_mask & ~mask;
+		fsnotify_set_mark_ignored_mask_locked(fsn_mark, tmask);
 	}
 	new_mask = fsn_mark->mask;
 	new_ignored = fsn_mark->ignored_mask;
-- 
1.9.1

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