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>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index bc423f7e..4e9ebe1 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -383,6 +383,11 @@
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)) {
