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| author | Chris Mason <chris.mason@fusionio.com> | 2013-05-07 11:00:13 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@fusionio.com> | 2013-05-07 11:00:13 -0400 |
| commit | 667e7d94a1683661cff5fe9a0fa0d7f8fdd2c007 (patch) | |
| tree | cfb87693ac910d328ab82b4723c43ebd2433f9b9 /fs/btrfs/disk-io.c | |
| parent | 1104a8855109a4051d74977f819a13b4516aa11e (diff) | |
| download | lwn-667e7d94a1683661cff5fe9a0fa0d7f8fdd2c007.tar.gz lwn-667e7d94a1683661cff5fe9a0fa0d7f8fdd2c007.zip | |
Btrfs: allow superblock mismatch from older mkfs
We've added new checks to make sure the super block crc is correct
during mount. A fresh filesystem from an older mkfs won't have the
crc set. This adds a warning when it finds a newly created filesystem
but doesn't fail the mount.
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs/btrfs/disk-io.c')
| -rw-r--r-- | fs/btrfs/disk-io.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index bc423f7eddce..4e9ebe1f1827 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -383,6 +383,11 @@ static int btrfs_check_super_csum(char *raw_disk_sb) if (memcmp(raw_disk_sb, result, csum_size)) ret = 1; + + if (ret && btrfs_super_generation(disk_sb) < 10) { + printk(KERN_WARNING "btrfs: super block crcs don't match, older mkfs detected\n"); + ret = 0; + } } if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) { |