ext4: regenerate buddy after block freeing failed if under fc replay

[ Upstream commit c9b528c35795b711331ed36dc3dbee90d5812d4e ]

This mostly reverts commit 6bd97bf273bd ("ext4: remove redundant
mb_regenerate_buddy()") and reintroduces mb_regenerate_buddy(). Based on
code in mb_free_blocks(), fast commit replay can end up marking as free
blocks that are already marked as such. This causes corruption of the
buddy bitmap so we need to regenerate it in that case.

Reported-by: Jan Kara <jack@suse.cz>
Fixes: 6bd97bf273bd ("ext4: remove redundant mb_regenerate_buddy()")
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20240104142040.2835097-4-libaokun1@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 1fd4ed19060dbb7d8f862fe69aeccc9f142be70a..529ca47da035380640c2b2d23f51b775cd8a9256 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -1232,6 +1232,24 @@ void ext4_mb_generate_buddy(struct super_block *sb,
        atomic64_add(period, &sbi->s_mb_generation_time);
 }
 
+static void mb_regenerate_buddy(struct ext4_buddy *e4b)
+{
+       int count;
+       int order = 1;
+       void *buddy;
+
+       while ((buddy = mb_find_buddy(e4b, order++, &count)))
+               mb_set_bits(buddy, 0, count);
+
+       e4b->bd_info->bb_fragments = 0;
+       memset(e4b->bd_info->bb_counters, 0,
+               sizeof(*e4b->bd_info->bb_counters) *
+               (e4b->bd_sb->s_blocksize_bits + 2));
+
+       ext4_mb_generate_buddy(e4b->bd_sb, e4b->bd_buddy,
+               e4b->bd_bitmap, e4b->bd_group, e4b->bd_info);
+}
+
 /* The buddy information is attached the buddy cache inode
  * for convenience. The information regarding each group
  * is loaded via ext4_mb_load_buddy. The information involve
@@ -1920,6 +1938,8 @@ static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
                        ext4_mark_group_bitmap_corrupted(
                                sb, e4b->bd_group,
                                EXT4_GROUP_INFO_BBITMAP_CORRUPT);
+               } else {
+                       mb_regenerate_buddy(e4b);
                }
                goto done;
        }