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

commit c9b528c35795b711331ed36dc3dbee90d5812d4e upstream.

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: Baokun Li <libaokun1@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 622f60d9e1c68b28f3c44b3b3c0e09e71328f1da..6bf98e61ed46db64cccaabfe87432041ab304136 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -1168,6 +1168,24 @@ void ext4_mb_generate_buddy(struct super_block *sb,
        mb_update_avg_fragment_size(sb, grp);
 }
 
+static void mb_regenerate_buddy(struct ext4_buddy *e4b)
+{
+       int count;
+       int order = 1;
+       void *buddy;
+
+       while ((buddy = mb_find_buddy(e4b, order++, &count)))
+               ext4_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
@@ -1846,6 +1864,8 @@ 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;
        }