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| author | Kemeng Shi <shikemeng@huaweicloud.com> | 2023-08-26 20:47:00 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2023-10-06 05:32:14 +0300 |
| commit | 31f13421c004a420c0e9d288859c9ea9259ea0cc (patch) | |
| tree | ab46a5fafeb9570b09bd34d5cdf1e866f639781f /fs/ext4/resize.c | |
| parent | ebf6cb7c6e1241984f75f29f1bdbfa2fe7168f88 (diff) | |
| download | linux-31f13421c004a420c0e9d288859c9ea9259ea0cc.tar.xz | |
ext4: correct offset of gdb backup in non meta_bg group to update_backups
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@huaweicloud.com>
Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lore.kernel.org/r/20230826174712.4059355-2-shikemeng@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Diffstat (limited to 'fs/ext4/resize.c')
| -rw-r--r-- | fs/ext4/resize.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 0361c20910de..87cd5b07a970 100644 --- 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; } } |