Commit 667e7d94 authored May 07, 2013 by Chris Mason

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>

parent 1104a885

fs/btrfs/disk-io.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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)) {