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authorMaarten ter Huurne <maarten@treewalker.org>2013-07-01 08:12:08 -0400
committerTheodore Ts'o <tytso@mit.edu>2013-07-01 08:12:08 -0400
commit6ca792edc13c409e8d4eb9001e048264c6a2eb64 (patch)
treed4f2cb0ece2d3ebf8cbbd982a5238b3a08978a65 /fs/ext4/resize.c
parent03b40e349695dc700582568e5b410a89058f707e (diff)
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ext4: fix corruption when online resizing a fs with 1K block size
Subtracting the number of the first data block places the superblock backups one block too early, corrupting the file system. When the block size is larger than 1K, the first data block is 0, so the subtraction has no effect and no corruption occurs. Signed-off-by: Maarten ter Huurne <maarten@treewalker.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Reviewed-by: Jan Kara <jack@suse.cz> CC: stable@vger.kernel.org
Diffstat (limited to 'fs/ext4/resize.c')
-rw-r--r--fs/ext4/resize.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 707095b924d9..c5adbb318a90 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1660,12 +1660,10 @@ errout:
err = err2;
if (!err) {
- ext4_fsblk_t first_block;
- first_block = ext4_group_first_block_no(sb, 0);
if (test_opt(sb, DEBUG))
printk(KERN_DEBUG "EXT4-fs: extended group to %llu "
"blocks\n", ext4_blocks_count(es));
- update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr - first_block,
+ update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr,
(char *)es, sizeof(struct ext4_super_block), 0);
}
return err;