btrfs: use existing device constraints table btrfs_raid_array

We should avoid duplicating the device constraints, let's use the
btrfs_raid_array in btrfs_check_raid_min_devices.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 6b38b72..055fbeb 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1731,6 +1731,7 @@ static int btrfs_check_raid_min_devices(struct btrfs_fs_info *fs_info,
 {
        u64 all_avail;
        unsigned seq;
+       int i;
 
        do {
                seq = read_seqbegin(&fs_info->profiles_lock);
@@ -1740,22 +1741,16 @@ static int btrfs_check_raid_min_devices(struct btrfs_fs_info *fs_info,
                            fs_info->avail_metadata_alloc_bits;
        } while (read_seqretry(&fs_info->profiles_lock, seq));
 
-       if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && num_devices < 4) {
-               return BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET;
-       }
-
-       if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) && num_devices < 2) {
-               return BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET;
-       }
+       for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
+               if (!(all_avail & btrfs_raid_group[i]))
+                       continue;
 
-       if ((all_avail & BTRFS_BLOCK_GROUP_RAID5) &&
-           fs_info->fs_devices->rw_devices < 2) {
-               return BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET;
-       }
+               if (num_devices < btrfs_raid_array[i].devs_min) {
+                       int ret = btrfs_raid_mindev_error[i];
 
-       if ((all_avail & BTRFS_BLOCK_GROUP_RAID6) &&
-           fs_info->fs_devices->rw_devices < 3) {
-               return BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET;
+                       if (ret)
+                               return ret;
+               }
        }
 
        return 0;