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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>
hifive-unleashed-5.1
Chris Mason 2013-05-07 11:00:13 -04:00
parent 1104a88551
commit 667e7d94a1
1 changed files with 5 additions and 0 deletions
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5
fs/btrfs/disk-io.c
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@ -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)) {