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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
This commit is contained in:
Maarten ter Huurne 2013-07-01 08:12:08 -04:00 committed by Theodore Ts'o
parent 03b40e3496
commit 6ca792edc1
1 changed files with 1 additions and 3 deletions
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4
fs/ext4/resize.c
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@ -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;