Btrfs: Force stripesize to the value of sectorsize

Btrfs code currently assumes stripesize to be same as
sectorsize. However Btrfs-progs (until commit
df05c7ed455f519e6e15e46196392e4757257305) has been setting
btrfs_super_block->stripesize to a value of 4096.

This commit makes sure that the value of btrfs_super_block->stripesize
is a power of 2. Later, it unconditionally sets btrfs_root->stripesize
to sectorsize.

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

2 files changed, 4 insertions, 6 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 54cca7a1572b..60ce1190307b 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2806,7 +2806,7 @@ int open_ctree(struct super_block *sb,
 
         nodesize = btrfs_super_nodesize(disk_super);
         sectorsize = btrfs_super_sectorsize(disk_super);
-        stripesize = btrfs_super_stripesize(disk_super);
+        stripesize = sectorsize;
         fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids));
         fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
 
@@ -4133,9 +4133,7 @@ static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
                        btrfs_super_bytes_used(sb));
                 ret = -EINVAL;
         }
-        if (!is_power_of_2(btrfs_super_stripesize(sb)) ||
-                ((btrfs_super_stripesize(sb) != sectorsize) &&
-                        (btrfs_super_stripesize(sb) != 4096))) {
+        if (!is_power_of_2(btrfs_super_stripesize(sb))) {
                 btrfs_err(fs_info, "invalid stripesize %u",
                        btrfs_super_stripesize(sb));
                 ret = -EINVAL;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c3a2900c6030..64eec2cec1d3 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4694,12 +4694,12 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 
         if (type & BTRFS_BLOCK_GROUP_RAID5) {
                 raid_stripe_len = find_raid56_stripe_len(ndevs - 1,
-                                 btrfs_super_stripesize(info->super_copy));
+                                                extent_root->stripesize);
                 data_stripes = num_stripes - 1;
         }
         if (type & BTRFS_BLOCK_GROUP_RAID6) {
                 raid_stripe_len = find_raid56_stripe_len(ndevs - 2,
-                                 btrfs_super_stripesize(info->super_copy));
+                                                extent_root->stripesize);
                 data_stripes = num_stripes - 2;
         }