diff options
Diffstat (limited to 'fs/btrfs/super.c')
| -rw-r--r-- | fs/btrfs/super.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 9be4fd2db0f4..5942b9384088 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -2555,6 +2555,7 @@ static int check_dev_super(struct btrfs_device *dev) { struct btrfs_fs_info *fs_info = dev->fs_info; struct btrfs_super_block *sb; + u16 csum_type; int ret = 0; /* This should be called with fs still frozen. */ @@ -2569,6 +2570,21 @@ static int check_dev_super(struct btrfs_device *dev) if (IS_ERR(sb)) return PTR_ERR(sb); + /* Verify the checksum. */ + csum_type = btrfs_super_csum_type(sb); + if (csum_type != btrfs_super_csum_type(fs_info->super_copy)) { + btrfs_err(fs_info, "csum type changed, has %u expect %u", + csum_type, btrfs_super_csum_type(fs_info->super_copy)); + ret = -EUCLEAN; + goto out; + } + + if (btrfs_check_super_csum(fs_info, sb)) { + btrfs_err(fs_info, "csum for on-disk super block no longer matches"); + ret = -EUCLEAN; + goto out; + } + /* Btrfs_validate_super() includes fsid check against super->fsid. */ ret = btrfs_validate_super(fs_info, sb, 0); if (ret < 0) |