From 667e7d94a1683661cff5fe9a0fa0d7f8fdd2c007 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Tue, 7 May 2013 11:00:13 -0400 Subject: [PATCH] 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 --- fs/btrfs/disk-io.c | 5 +++++ 1 file changed, 5 insertions(+) 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)) { -- 2.34.1