[PATCH] btrfs: Remove unused btrfs_is_parity_mirror

[linux@treblig.org]

From: "Dr. David Alan Gilbert" <linux@treblig.org>

btrfs_is_parity_mirror() has been unused since commit
4886ff7b50f6 ("btrfs: introduce a new helper to submit write bio for repair")

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
---
 fs/btrfs/volumes.c | 18 ------------------
 fs/btrfs/volumes.h |  2 --
 2 files changed, 20 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 8f340ad1d938..7453b4999263 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5841,24 +5841,6 @@ unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
 	return len;
 }
 
-int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
-{
-	struct btrfs_chunk_map *map;
-	int ret = 0;
-
-	if (!btrfs_fs_incompat(fs_info, RAID56))
-		return 0;
-
-	map = btrfs_get_chunk_map(fs_info, logical, len);
-
-	if (!WARN_ON(IS_ERR(map))) {
-		if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
-			ret = 1;
-		btrfs_free_chunk_map(map);
-	}
-	return ret;
-}
-
 static int find_live_mirror(struct btrfs_fs_info *fs_info,
 			    struct btrfs_chunk_map *map, int first,
 			    int dev_replace_is_ongoing)
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 03d2d60afe0c..715af107ea5d 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -735,8 +735,6 @@ int btrfs_run_dev_stats(struct btrfs_trans_handle *trans);
 void btrfs_rm_dev_replace_remove_srcdev(struct btrfs_device *srcdev);
 void btrfs_rm_dev_replace_free_srcdev(struct btrfs_device *srcdev);
 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev);
-int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
-			   u64 logical, u64 len);
 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
 				    u64 logical);
 u64 btrfs_calc_stripe_length(const struct btrfs_chunk_map *map);
-- 
2.46.2