btrfs: balance: factor out convert profile validation

The validation follows the same steps for all three block group types,
the existing helper validate_convert_profile can be enhanced and do more
of the common things.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index f693bc5..74c34c3 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3801,13 +3801,25 @@ static inline int balance_need_close(struct btrfs_fs_info *fs_info)
                 atomic_read(&fs_info->balance_cancel_req) == 0);
 }
 
-/* Non-zero return value signifies invalidity */
-static inline int validate_convert_profile(struct btrfs_balance_args *bctl_arg,
-               u64 allowed)
+/*
+ * Validate target profile against allowed profiles and return true if it's OK.
+ * Otherwise print the error message and return false.
+ */
+static inline int validate_convert_profile(struct btrfs_fs_info *fs_info,
+               const struct btrfs_balance_args *bargs,
+               u64 allowed, const char *type)
 {
-       return ((bctl_arg->flags & BTRFS_BALANCE_ARGS_CONVERT) &&
-               (!alloc_profile_is_valid(bctl_arg->target, 1) ||
-                (bctl_arg->target & ~allowed)));
+       if (!(bargs->flags & BTRFS_BALANCE_ARGS_CONVERT))
+               return true;
+
+       /* Profile is valid and does not have bits outside of the allowed set */
+       if (alloc_profile_is_valid(bargs->target, 1) &&
+           (bargs->target & ~allowed) == 0)
+               return true;
+
+       btrfs_err(fs_info, "balance: invalid convert %s profile %s",
+                       type, btrfs_bg_type_to_raid_name(bargs->target));
+       return false;
 }
 
 /*
@@ -4023,24 +4035,9 @@ int btrfs_balance(struct btrfs_fs_info *fs_info,
                if (num_devices >= btrfs_raid_array[i].devs_min)
                        allowed |= btrfs_raid_array[i].bg_flag;
 
-       if (validate_convert_profile(&bctl->data, allowed)) {
-               btrfs_err(fs_info,
-                         "balance: invalid convert data profile %s",
-                         btrfs_bg_type_to_raid_name(bctl->data.target));
-               ret = -EINVAL;
-               goto out;
-       }
-       if (validate_convert_profile(&bctl->meta, allowed)) {
-               btrfs_err(fs_info,
-                         "balance: invalid convert metadata profile %s",
-                         btrfs_bg_type_to_raid_name(bctl->meta.target));
-               ret = -EINVAL;
-               goto out;
-       }
-       if (validate_convert_profile(&bctl->sys, allowed)) {
-               btrfs_err(fs_info,
-                         "balance: invalid convert system profile %s",
-                         btrfs_bg_type_to_raid_name(bctl->sys.target));
+       if (!validate_convert_profile(fs_info, &bctl->data, allowed, "data") ||
+           !validate_convert_profile(fs_info, &bctl->meta, allowed, "metadata") ||
+           !validate_convert_profile(fs_info, &bctl->sys,  allowed, "system")) {
                ret = -EINVAL;
                goto out;
        }