1 files changed, 25 insertions, 3 deletions

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index aa7d058..a41e3ba 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -751,13 +751,15 @@ void ext4_mb_generate_buddy(struct super_block *sb,
 
 	if (free != grp->bb_free) {
 		ext4_grp_locked_error(sb, group, 0, 0,
-				      "%u clusters in bitmap, %u in gd",
+				      "%u clusters in bitmap, %u in gd; "
+				      "block bitmap corrupt.",
 				      free, grp->bb_free);
 		/*
-		 * If we intent to continue, we consider group descritor
+		 * If we intend to continue, we consider group descriptor
 		 * corrupt and update bb_free using bitmap value
 		 */
 		grp->bb_free = free;
+		set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
 	}
 	mb_set_largest_free_order(sb, grp);
 
@@ -1398,6 +1400,10 @@ static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
 
 	BUG_ON(last >= (sb->s_blocksize << 3));
 	assert_spin_locked(ext4_group_lock_ptr(sb, e4b->bd_group));
+	/* Don't bother if the block group is corrupt. */
+	if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info)))
+		return;
+
 	mb_check_buddy(e4b);
 	mb_free_blocks_double(inode, e4b, first, count);
 
@@ -1423,7 +1429,11 @@ static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
 				      inode ? inode->i_ino : 0,
 				      blocknr,
 				      "freeing already freed block "
-				      "(bit %u)", block);
+				      "(bit %u); block bitmap corrupt.",
+				      block);
+		/* Mark the block group as corrupt. */
+		set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
+			&e4b->bd_info->bb_state);
 		mb_regenerate_buddy(e4b);
 		goto done;
 	}
@@ -1790,6 +1800,11 @@ int ext4_mb_find_by_goal(struct ext4_allocation_context *ac,
 	if (err)
 		return err;
 
+	if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))) {
+		ext4_mb_unload_buddy(e4b);
+		return 0;
+	}
+
 	ext4_lock_group(ac->ac_sb, group);
 	max = mb_find_extent(e4b, ac->ac_g_ex.fe_start,
 			     ac->ac_g_ex.fe_len, &ex);
@@ -1987,6 +2002,9 @@ static int ext4_mb_good_group(struct ext4_allocation_context *ac,
 	if (cr <= 2 && free < ac->ac_g_ex.fe_len)
 		return 0;
 
+	if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(grp)))
+		return 0;
+
 	/* We only do this if the grp has never been initialized */
 	if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) {
 		int ret = ext4_mb_init_group(ac->ac_sb, group);
@@ -4674,6 +4692,10 @@ do_more:
 	overflow = 0;
 	ext4_get_group_no_and_offset(sb, block, &block_group, &bit);
 
+	if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(
+			ext4_get_group_info(sb, block_group))))
+		return;
+
 	/*
 	 * Check to see if we are freeing blocks across a group
 	 * boundary.