linux-kernel - [PATCH v2 2/3] fanotify: dont recalculate a marks mask if only the ignored mask changed

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Message-Id: <1417668184-14544-2-git-send-email-LinoSanfilippo@gmx.de>
Date:	Thu,  4 Dec 2014 05:43:03 +0100
From:	Lino Sanfilippo <LinoSanfilippo@....de>
To:	eparis@...hat.com, jack@...e.cz
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Lino Sanfilippo <LinoSanfilippo@....de>
Subject: [PATCH v2 2/3] fanotify: dont recalculate a marks mask if only the ignored mask changed

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@....de>
Reviewed-by: Jan Kara <jack@...e.cz>
---
 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 ba31055..ddc33fb 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -487,15 +487,15 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
 					    unsigned int flags,
 					    int *destroy)
 {
-	__u32 oldmask;
+	__u32 oldmask = 0;
 
 	spin_lock(&fsn_mark->lock);
 	if (!(flags & FAN_MARK_IGNORED_MASK)) {
 		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);
 	}
 	*destroy = !(fsn_mark->mask | fsn_mark->ignored_mask);
 	spin_unlock(&fsn_mark->lock);
-- 
1.9.1

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