Btrfs: btrfs_check_super_valid: Allow 4096 as stripesize

Older btrfs-progs/mkfs.btrfs sets 4096 as the stripesize. Hence
restricting stripesize to be equal to sectorsize would cause super block
validation to return an error on architectures where PAGE_SIZE is not
equal to 4096.

Hence as a workaround, this commit allows stripesize to be set to 4096
bytes.

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 789f5f233940..54cca7a1572b 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4134,7 +4134,8 @@ static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
                 ret = -EINVAL;
         }
         if (!is_power_of_2(btrfs_super_stripesize(sb)) ||
-            btrfs_super_stripesize(sb) != sectorsize) {
+                ((btrfs_super_stripesize(sb) != sectorsize) &&
+                        (btrfs_super_stripesize(sb) != 4096))) {
                 btrfs_err(fs_info, "invalid stripesize %u",
                        btrfs_super_stripesize(sb));
                 ret = -EINVAL;