Commit e56a951e authored Mar 17, 2015 by Liu Bo Committed by Chris Mason Mar 26, 2015

Btrfs: Remove the check for old-style mkfs

This was used to make sure that a fresh btrfs from an older mkfs.btrfs,
but it also allows us to mount a buggy btrfs if this btrfs has the right
superblock head part but has something wrong with chunk tree part[1], and
after that we can hit BUG_ON()s set in the code to prevent something
impossible.

Since David has released "Btrfs progs v3.19-rc2", just remove the check,
if anyone who wants to make a fresh btrfs, please use the latest one.

[1]: http://www.spinics.net/lists/linux-btrfs/msg42358.html



Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Omar Sandoval <osandov@osandov.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

parent 727b9784

fs/btrfs/disk-io.c

+0 −6

Original line number	Original line	Diff line number	Diff line
	@@ -419,12 +419,6 @@ static int btrfs_check_super_csum(char *raw_disk_sb)

	if (memcmp(raw_disk_sb, result, csum_size))		if (memcmp(raw_disk_sb, result, csum_size))
	ret = 1;		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)) {		if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {