This is a note to let you know that I've just added the patch titled
ext4: correct offset of gdb backup in non meta_bg group to update_backups
to the 6.6-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-correct-offset-of-gdb-backup-in-non-meta_bg-group-to-update_backups.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 31f13421c004a420c0e9d288859c9ea9259ea0cc Mon Sep 17 00:00:00 2001
From: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
Date: Sun, 27 Aug 2023 01:47:00 +0800
Subject: ext4: correct offset of gdb backup in non meta_bg group to update_backups
From: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
commit 31f13421c004a420c0e9d288859c9ea9259ea0cc upstream.
Commit 0aeaa2559d6d5 ("ext4: fix corruption when online resizing a 1K
bigalloc fs") found that primary superblock's offset in its group is
not equal to offset of backup superblock in its group when block size
is 1K and bigalloc is enabled. As group descriptor blocks are right
after superblock, we can't pass block number of gdb to update_backups
for the same reason.
The root casue of the issue above is that leading 1K padding block is
count as data block offset for primary block while backup block has no
padding block offset in its group.
Remove padding data block count to fix the issue for gdb backups.
For meta_bg case, update_backups treat blk_off as block number, do no
conversion in this case.
Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
Reviewed-by: Theodore Ts'o <tytso@xxxxxxx>
Link: https://lore.kernel.org/r/20230826174712.4059355-2-shikemeng@xxxxxxxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Cc: stable@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/resize.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1601,6 +1601,8 @@ exit_journal:
int gdb_num_end = ((group + flex_gd->count - 1) /
EXT4_DESC_PER_BLOCK(sb));
int meta_bg = ext4_has_feature_meta_bg(sb);
+ sector_t padding_blocks = meta_bg ? 0 : sbi->s_sbh->b_blocknr -
+ ext4_group_first_block_no(sb, 0);
sector_t old_gdb = 0;
update_backups(sb, ext4_group_first_block_no(sb, 0),
@@ -1612,8 +1614,8 @@ exit_journal:
gdb_num);
if (old_gdb == gdb_bh->b_blocknr)
continue;
- update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data,
- gdb_bh->b_size, meta_bg);
+ update_backups(sb, gdb_bh->b_blocknr - padding_blocks,
+ gdb_bh->b_data, gdb_bh->b_size, meta_bg);
old_gdb = gdb_bh->b_blocknr;
}
}
Patches currently in stable-queue which might be from shikemeng@xxxxxxxxxxxxxxx are
queue-6.6/ext4-correct-offset-of-gdb-backup-in-non-meta_bg-group-to-update_backups.patch
queue-6.6/ext4-remove-gdb-backup-copy-for-meta-bg-in-setup_new_flex_group_blocks.patch
queue-6.6/ext4-add-missed-brelse-in-update_backups.patch
queue-6.6/ext4-correct-return-value-of-ext4_convert_meta_bg.patch
