@@ -1488,6 +1488,7 @@ struct ext4_sb_info {
loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
struct buffer_head * s_sbh; /* Buffer containing the super block */
struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
+ /* Array of bh's for the block group descriptors */
struct buffer_head * __rcu *s_group_desc;
unsigned int s_mount_opt;
unsigned int s_mount_opt2;
@@ -1588,7 +1588,6 @@ static int ext4_flex_group_add(struct super_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),
(char *)es, sizeof(struct ext4_super_block), 0);
@@ -1597,11 +1596,8 @@ static int ext4_flex_group_add(struct super_block *sb,
gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc,
gdb_num);
- if (old_gdb == gdb_bh->b_blocknr)
- continue;
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;
}
}
exit:
The sbi->s_group_desc contains array of bh's for block group descriptors and continuous EXT4_DESC_PER_BLOCK(sb) bg descriptors in single block share the same bh. Simply call update_backups for each gdb_bh in sbi->s_group_desc will not update same group descriptors block for multiple times. Commit 0acdb8876fead ("ext4: don't call update_backups() multiple times for the same bg") wrongly assumed each block group descriptor in the same block has a individual bh and unnecessary check was added. Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com> --- fs/ext4/ext4.h | 1 + fs/ext4/resize.c | 4 ---- 2 files changed, 1 insertion(+), 4 deletions(-)