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@gmail.com>

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 4410cc3..3384dc4 100644 (file)
--- 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