linux-ext4 - [PATCH] ext4: fix bigalloc regression

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Date:	Mon, 6 Jan 2014 13:46:19 -0500
From:	Eric Whitney <enwlinux@...il.com>
To:	linux-ext4@...r.kernel.org
Cc:	tytso@....edu
Subject: [PATCH] ext4: fix bigalloc regression

Commit f5a44db5d2 introduced a regression on filesystems created with
the bigalloc feature (cluster size > blocksize).  It causes xfstests
generic/006 and /013 to fail with an unexpected JBD2 failure and
transaction abort that leaves the test file system in a read only state.
Other xfstests run on bigalloc file systems are likely to fail as well.

The cause is the accidental use of a cluster mask where a cluster
offset was needed in ext4_ext_map_blocks().

Signed-off-by: Eric Whitney <enwlinux@...il.com>
---
 fs/ext4/extents.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 4410cc3..3384dc4 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4218,7 +4218,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
 	 */
 	map->m_flags &= ~EXT4_MAP_FROM_CLUSTER;
 	newex.ee_block = cpu_to_le32(map->m_lblk);
-	cluster_offset = EXT4_LBLK_CMASK(sbi, map->m_lblk);
+	cluster_offset = EXT4_LBLK_COFF(sbi, map->m_lblk);

 	/*
 	 * If we are doing bigalloc, check to see if the extent returned
-- 
1.8.3.2

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