This is a note to let you know that I've just added the patch titled
ext4: fix online resize with a non-standard blocks per group setting
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-fix-online-resize-with-a-non-standard-blocks-per-group-setting.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3d2660d0c9c2f296837078c189b68a47f6b2e3b5 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@xxxxxxx>
Date: Sat, 15 Feb 2014 22:42:25 -0500
Subject: ext4: fix online resize with a non-standard blocks per group setting
From: Theodore Ts'o <tytso@xxxxxxx>
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@xxxxxxx>
Reported-by: Jon Bernard <jbernard@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/resize.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -377,7 +377,7 @@ static int set_flexbg_block_bitmap(struc
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;
Patches currently in stable-queue which might be from tytso@xxxxxxx are
queue-3.4/ext4-fix-online-resize-with-a-non-standard-blocks-per-group-setting.patch
queue-3.4/ext4-don-t-try-to-modify-s_flags-if-the-the-file-system-is-read-only.patch
queue-3.4/ext4-don-t-leave-i_crtime.tv_sec-uninitialized.patch
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