btrfs: Remove unused parameters from volume.c functions

This also adjusts the respective callers in other files. Those were
found with -Wunused-parameter.

btrfs_full_stripe_len's mapping_tree - introduced by 53b381b3ab
("Btrfs: RAID5 and RAID6") but it was never really used even in that
commit

btrfs_is_parity_mirror's mirror_num - same as above

chunk_drange_filter's chunk_offset - introduced by 94e60d5a5c ("Btrfs:
devid subset filter") and never used.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent-tree.c

@@ -9944,9 +9944,7 @@ btrfs_create_block_group_cache(struct btrfs_fs_info *fs_info,
 	cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
 
 	cache->fs_info = fs_info;
-	cache->full_stripe_len = btrfs_full_stripe_len(fs_info,
-						       &fs_info->mapping_tree,
-						       start);
+	cache->full_stripe_len = btrfs_full_stripe_len(fs_info, start);
 	set_free_space_tree_thresholds(cache);
 
 	atomic_set(&cache->count, 1);

fs/btrfs/extent_io.c

@@ -1997,7 +1997,7 @@ int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
 	 * read repair operation.
 	 */
 	btrfs_bio_counter_inc_blocked(fs_info);
-	if (btrfs_is_parity_mirror(fs_info, logical, length, mirror_num)) {
+	if (btrfs_is_parity_mirror(fs_info, logical, length)) {
 		/*
 		 * Note that we don't use BTRFS_MAP_WRITE because it's supposed
 		 * to update all raid stripes, but here we just want to correct

fs/btrfs/volumes.c

@@ -3305,7 +3305,6 @@ static int chunk_devid_filter(struct extent_buffer *leaf,
 /* [pstart, pend) */
 static int chunk_drange_filter(struct extent_buffer *leaf,
 			       struct btrfs_chunk *chunk,
-			       u64 chunk_offset,
 			       struct btrfs_balance_args *bargs)
 {
 	struct btrfs_stripe *stripe;
@@ -3432,7 +3431,7 @@ static int should_balance_chunk(struct btrfs_fs_info *fs_info,
 
 	/* drange filter, makes sense only with devid filter */
 	if ((bargs->flags & BTRFS_BALANCE_ARGS_DRANGE) &&
-	    chunk_drange_filter(leaf, chunk, chunk_offset, bargs)) {
+	    chunk_drange_filter(leaf, chunk, bargs)) {
 		return 0;
 	}
 
@@ -5128,7 +5127,6 @@ int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
 }
 
 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
-				    struct btrfs_mapping_tree *map_tree,
 				    u64 logical)
 {
 	struct extent_map *em;
@@ -5146,8 +5144,7 @@ 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, int mirror_num)
+int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
 {
 	struct extent_map *em;
 	struct map_lookup *map;

fs/btrfs/volumes.h

@@ -481,9 +481,8 @@ void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
 					      struct btrfs_device *tgtdev);
 void btrfs_scratch_superblocks(struct block_device *bdev, const char *device_path);
 int btrfs_is_parity_mirror(struct btrfs_fs_info *fs_info,
-			   u64 logical, u64 len, int mirror_num);
+			   u64 logical, u64 len);
 unsigned long btrfs_full_stripe_len(struct btrfs_fs_info *fs_info,
-				    struct btrfs_mapping_tree *map_tree,
 				    u64 logical);
 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
 				struct btrfs_fs_info *fs_info,