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

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

From: Jan Kara <[email protected]>

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 <[email protected]>
Reviewed-by: Dave Chinner <[email protected]>
Signed-off-by: Dave Chinner <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 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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