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| author | Theodore Ts'o <tytso@mit.edu> | 2014-02-15 22:42:25 -0500 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-03-05 17:13:39 +0100 |
| commit | 50e31fc3f09c418d312d4129d8f01f607087bd5a (patch) | |
| tree | af6d1964bb9bae0e824d4b4c2c431d1f38439941 | |
| parent | c6f75d48dffe9216edacf94205ab55aebe67e46f (diff) | |
ext4: fix online resize with a non-standard blocks per group setting
commit 3d2660d0c9c2f296837078c189b68a47f6b2e3b5 upstream.
The set_flexbg_block_bitmap() function assumed that the number of
blocks in a blockgroup was sb->blocksize * 8, which is normally true,
but not always! Use EXT4_BLOCKS_PER_GROUP(sb) instead, to fix block
bitmap corruption after:
mke2fs -t ext4 -g 3072 -i 4096 /dev/vdd 1G
mount -t ext4 /dev/vdd /vdd
resize2fs /dev/vdd 8G
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reported-by: Jon Bernard <jbernard@tuxion.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | fs/ext4/resize.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 69a62610a6ca..f3b84cd9de56 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -409,7 +409,7 @@ static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle, start = ext4_group_first_block_no(sb, group); group -= flex_gd->groups[0].group; - count2 = sb->s_blocksize * 8 - (block - start); + count2 = EXT4_BLOCKS_PER_GROUP(sb) - (block - start); if (count2 > count) count2 = count; |