linux-ext4 - [PATCH 4/4] ext4: mark block bitmap corrupted when found

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Date:   Wed, 18 Apr 2018 09:08:32 +0900
From:   Wang Shilong <wangshilong1991@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     adilger@...ger.ca, bo.liu@...ux.alibaba.com, wshilong@....com,
        sihara@....com, tytso@....edu
Subject: [PATCH 4/4] ext4: mark block bitmap corrupted when found

From: Wang Shilong <wshilong@....com>

There are still some cases that we missed to set
block bitmaps corrupted bit properly:

1) block bitmap number is wrong.
2) failed to read block bitmap due to disk errors.
3) double free block bitmaps..
4) some mismatch check with bitmaps vs buddy information.

Suggested-by: Theodore Y. Ts'o <tytso@....edu>
Signed-off-by: Liu Bo <bo.liu@...ux.alibaba.com>
Signed-off-by: Wang Shilong <wshilong@....com>
---
 fs/ext4/balloc.c  | 4 ++++
 fs/ext4/mballoc.c | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 0ac442aff7b8..8ef65251d019 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -420,6 +420,8 @@ ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group)
 	    (bitmap_blk >= ext4_blocks_count(sbi->s_es))) {
 		ext4_error(sb, "Invalid block bitmap block %llu in "
 			   "block_group %u", bitmap_blk, block_group);
+		ext4_mark_group_bitmap_corrupted(sb, block_group,
+					EXT4_GROUP_INFO_BBITMAP_CORRUPT);
 		return ERR_PTR(-EFSCORRUPTED);
 	}
 	bh = sb_getblk(sb, bitmap_blk);
@@ -498,6 +500,8 @@ int ext4_wait_block_bitmap(struct super_block *sb, ext4_group_t block_group,
 		ext4_error(sb, "Cannot read block bitmap - "
 			   "block_group = %u, block_bitmap = %llu",
 			   block_group, (unsigned long long) bh->b_blocknr);
+		ext4_mark_group_bitmap_corrupted(sb, block_group,
+					EXT4_GROUP_INFO_BBITMAP_CORRUPT);
 		return -EIO;
 	}
 	clear_buffer_new(bh);
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index bc2d1eb9fd5d..0d473991eebd 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -470,6 +470,8 @@ static void mb_free_blocks_double(struct inode *inode, struct ext4_buddy *e4b,
 					      "freeing block already freed "
 					      "(bit %u)",
 					      first + i);
+			ext4_mark_group_bitmap_corrupted(sb, e4b->bd_group,
+					EXT4_GROUP_INFO_BBITMAP_CORRUPT);
 		}
 		mb_clear_bit(first + i, e4b->bd_info->bb_bitmap);
 	}
@@ -1950,6 +1952,8 @@ void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
 					"%d free clusters as per "
 					"group info. But bitmap says 0",
 					free);
+			ext4_mark_group_bitmap_corrupted(sb, e4b->bd_group,
+					EXT4_GROUP_INFO_BBITMAP_CORRUPT);
 			break;
 		}
 
@@ -1960,6 +1964,8 @@ void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
 					"%d free clusters as per "
 					"group info. But got %d blocks",
 					free, ex.fe_len);
+			ext4_mark_group_bitmap_corrupted(sb, e4b->bd_group,
+					EXT4_GROUP_INFO_BBITMAP_CORRUPT);
 			/*
 			 * The number of free blocks differs. This mostly
 			 * indicate that the bitmap is corrupt. So exit
-- 
2.14.3