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authorTheodore Ts'o <tytso@mit.edu>2014-02-16 07:42:25 +0400
committerTheodore Ts'o <tytso@mit.edu>2014-02-16 07:42:25 +0400
commit3d2660d0c9c2f296837078c189b68a47f6b2e3b5 (patch)
tree752dc9c0515f3c35d77ebccc0cc68e03813d5c1f /fs/ext4/resize.c
parentb93c95353413041a8cebad915a8109619f66bcc6 (diff)
downloadlinux-3d2660d0c9c2f296837078c189b68a47f6b2e3b5.tar.xz
ext4: fix online resize with a non-standard blocks per group setting
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> Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/ext4/resize.c')
-rw-r--r--fs/ext4/resize.c2
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;