ext4: mark block bitmap corrupted when found instead of BUGON

We already has similar code in ext4_mb_complex_scan_group(), but
ext4_mb_simple_scan_group() still affected.

Other reports: https://www.spinics.net/lists/linux-ext4/msg60231.html

Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Dmitry Monakhov <dmonakhov@gmail.com>
Link: https://lore.kernel.org/r/20200310150156.641-1-dmonakhov@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 1027e01..97cd1a2 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -1901,8 +1901,15 @@ void ext4_mb_simple_scan_group(struct ext4_allocation_context *ac,
                BUG_ON(buddy == NULL);
 
                k = mb_find_next_zero_bit(buddy, max, 0);
-               BUG_ON(k >= max);
-
+               if (k >= max) {
+                       ext4_grp_locked_error(ac->ac_sb, e4b->bd_group, 0, 0,
+                               "%d free clusters of order %d. But found 0",
+                               grp->bb_counters[i], i);
+                       ext4_mark_group_bitmap_corrupted(ac->ac_sb,
+                                        e4b->bd_group,
+                                       EXT4_GROUP_INFO_BBITMAP_CORRUPT);
+                       break;
+               }
                ac->ac_found++;
 
                ac->ac_b_ex.fe_len = 1 << i;