mm: Remove false WARN_ON from pagecache_isize_extended()

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@suse.cz>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/mm/truncate.c b/mm/truncate.c
index 7dfb7c70fd4b66caac11f3ea94a6b62087a97ebd..827ad8d2b5cd8c4fca0122d9662f191c4f38f5ce 100644 (file)
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -697,7 +697,6 @@ void pagecache_isize_extended(struct inode *inode, loff_t from, loff_t to)
        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)