btrfs: change return type of btrfs_alloc_dummy_sum() to int

The type blk_status_t is from block layer and not related to checksums
in our context. Use int internally and do the conversions to blk_status_t
as needed in btrfs_submit_chunk().

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: kdave

fs/btrfs/bio.c

@@ -755,7 +755,8 @@ static bool btrfs_submit_chunk(struct btrfs_bio *bbio, int mirror_num)
 		} else if (use_append ||
 			   (btrfs_is_zoned(fs_info) && inode &&
 			    inode->flags & BTRFS_INODE_NODATASUM)) {
-			status = btrfs_alloc_dummy_sum(bbio);
+			ret = btrfs_alloc_dummy_sum(bbio);
+			status = errno_to_blk_status(ret);
 			if (status)
 				goto fail;
 		}

fs/btrfs/file-item.c

@@ -794,11 +794,11 @@ int btrfs_csum_one_bio(struct btrfs_bio *bbio)
  * record the updated logical address on Zone Append completion.
  * Allocate just the structure with an empty sums array here for that case.
  */
-blk_status_t btrfs_alloc_dummy_sum(struct btrfs_bio *bbio)
+int btrfs_alloc_dummy_sum(struct btrfs_bio *bbio)
 {
 	bbio->sums = kmalloc(sizeof(*bbio->sums), GFP_NOFS);
 	if (!bbio->sums)
-		return BLK_STS_RESOURCE;
+		return -ENOMEM;
 	bbio->sums->len = bbio->bio.bi_iter.bi_size;
 	bbio->sums->logical = bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT;
 	btrfs_add_ordered_sum(bbio->ordered, bbio->sums);

fs/btrfs/file-item.h

@@ -65,7 +65,7 @@ int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
 			   struct btrfs_root *root,
 			   struct btrfs_ordered_sum *sums);
 int btrfs_csum_one_bio(struct btrfs_bio *bbio);
-blk_status_t btrfs_alloc_dummy_sum(struct btrfs_bio *bbio);
+int btrfs_alloc_dummy_sum(struct btrfs_bio *bbio);
 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
 			     struct list_head *list, int search_commit,
 			     bool nowait);