linux-kernel - [PATCH 3.14 184/203] mm: Remove false WARN_ON from pagecache_isize

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Date:	Wed, 12 Nov 2014 10:17:34 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jan Kara <jack@...e.cz>,
	Dave Chinner <dchinner@...hat.com>,
	Dave Chinner <david@...morbit.com>
Subject: [PATCH 3.14 184/203] mm: Remove false WARN_ON from pagecache_isize_extended()

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jan Kara <jack@...e.cz>

commit f55fefd1a5a339b1bd08c120b93312d6eb64a9fb upstream.

The WARN_ON checking whether i_mutex is held in
pagecache_isize_extended() was wrong because some filesystems (e.g.
XFS) use different locks for serialization of truncates / writes. So
just remove the check.

Signed-off-by: Jan Kara <jack@...e.cz>
Reviewed-by: Dave Chinner <dchinner@...hat.com>
Signed-off-by: Dave Chinner <david@...morbit.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 mm/truncate.c |    1 -
 1 file changed, 1 deletion(-)

--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -649,7 +649,6 @@ void pagecache_isize_extended(struct ino
 	struct page *page;
 	pgoff_t index;
 
-	WARN_ON(!mutex_is_locked(&inode->i_mutex));
 	WARN_ON(to > inode->i_size);
 
 	if (from >= to || bsize == PAGE_CACHE_SIZE)


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