linux-kernel - [PATCH 1/5] fanotify: Remove useless bypass

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Date:	Mon,  3 Mar 2014 12:12:19 +0100
From:	Jan Kara <jack@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-fsdevel@...r.kernel.org,
	Eric Paris <eparis@...isplace.org>, Jan Kara <jack@...e.cz>
Subject: [PATCH 1/5] fanotify: Remove useless bypass_perm check

prepare_for_access_response() checks whether
group->fanotify_data.bypass_perm is set. However this test can never be
true because prepare_for_access_response() is called only from
fanotify_read() which means fanotify group is alive with an active fd
while bypass_perm is set from fanotify_release() when all file
descriptors pointing to the group are closed and the group is going
away.

Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/notify/fanotify/fanotify_user.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 287a22c04149..70fe65437d21 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -211,14 +211,6 @@ static int prepare_for_access_response(struct fsnotify_group *group,
 	re->fd = fd;
 
 	mutex_lock(&group->fanotify_data.access_mutex);
-
-	if (atomic_read(&group->fanotify_data.bypass_perm)) {
-		mutex_unlock(&group->fanotify_data.access_mutex);
-		kmem_cache_free(fanotify_response_event_cache, re);
-		FANOTIFY_E(event)->response = FAN_ALLOW;
-		return 0;
-	}
-		
 	list_add_tail(&re->list, &group->fanotify_data.access_list);
 	mutex_unlock(&group->fanotify_data.access_mutex);
 
-- 
1.8.1.4

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