4.19-stable review patch. If anyone has any objections, please let me know.
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From: Kemeng Shi shikemeng@huaweicloud.com
commit 40dd7953f4d606c280074f10d23046b6812708ce upstream.
Wrong check of gdb backup in meta bg as following: first_group is the first group of meta_bg which contains target group, so target group is always >= first_group. We check if target group has gdb backup by comparing first_group with [group + 1] and [group + EXT4_DESC_PER_BLOCK(sb) - 1]. As group >= first_group, then [group + N] is
first_group. So no copy of gdb backup in meta bg is done in
setup_new_flex_group_blocks.
No need to do gdb backup copy in meta bg from setup_new_flex_group_blocks as we always copy updated gdb block to backups at end of ext4_flex_group_add as following:
ext4_flex_group_add /* no gdb backup copy for meta bg any more */ setup_new_flex_group_blocks
/* update current group number */ ext4_update_super sbi->s_groups_count += flex_gd->count;
/* * if group in meta bg contains backup is added, the primary gdb block * of the meta bg will be copy to backup in new added group here. */ for (; gdb_num <= gdb_num_end; gdb_num++) update_backups(...)
In summary, we can remove wrong gdb backup copy code in setup_new_flex_group_blocks.
Signed-off-by: Kemeng Shi shikemeng@huaweicloud.com Reviewed-by: Theodore Ts'o tytso@mit.edu Link: https://lore.kernel.org/r/20230826174712.4059355-5-shikemeng@huaweicloud.com Signed-off-by: Theodore Ts'o tytso@mit.edu Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ext4/resize.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-)
--- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -572,13 +572,8 @@ static int setup_new_flex_group_blocks(s if (meta_bg == 0 && !ext4_bg_has_super(sb, group)) goto handle_itb;
- if (meta_bg == 1) { - ext4_group_t first_group; - first_group = ext4_meta_bg_first_group(sb, group); - if (first_group != group + 1 && - first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1) - goto handle_itb; - } + if (meta_bg == 1) + goto handle_itb;
block = start + ext4_bg_has_super(sb, group); /* Copy all of the GDT blocks into the backup in this group */