btrfs: do not return errors from btrfs_submit_compressed_read

btrfs_submit_compressed_read already calls ->bi_end_io on error and
the caller must ignore the return value, so remove it.
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/compression.c

@@ -801,7 +801,7 @@ static noinline int add_ra_bio_pages(struct inode *inode,
  * After the compressed pages are read, we copy the bytes into the
  * bio we were passed and then call the bio end_io calls
  */
-blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
+void btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 				  int mirror_num, unsigned long bio_flags)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
@@ -947,7 +947,7 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 			comp_bio = NULL;
 		}
 	}
-	return BLK_STS_OK;
+	return;
 
 fail:
 	if (cb->compressed_pages) {
@@ -963,7 +963,7 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 	free_extent_map(em);
 	bio->bi_status = ret;
 	bio_endio(bio);
-	return ret;
+	return;
 finish_cb:
 	if (comp_bio) {
 		comp_bio->bi_status = ret;
@@ -971,7 +971,7 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 	}
 	/* All bytes of @cb is submitted, endio will free @cb */
 	if (cur_disk_byte == disk_bytenr + compressed_len)
-		return ret;
+		return;
 
 	wait_var_event(cb, refcount_read(&cb->pending_sectors) ==
 			   (disk_bytenr + compressed_len - cur_disk_byte) >>
@@ -983,7 +983,6 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 	ASSERT(refcount_read(&cb->pending_sectors));
 	/* Now we are the only one referring @cb, can finish it safely. */
 	finish_compressed_bio_read(cb);
-	return ret;
 }
 
 /*

fs/btrfs/compression.h

@@ -102,7 +102,7 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start,
 				  unsigned int write_flags,
 				  struct cgroup_subsys_state *blkcg_css,
 				  bool writeback);
-blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
+void btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 				  int mirror_num, unsigned long bio_flags);
 
 unsigned int btrfs_compress_str2level(unsigned int type, const char *str);

fs/btrfs/inode.c

@@ -2607,10 +2607,9 @@ blk_status_t btrfs_submit_data_bio(struct inode *inode, struct bio *bio,
 			 * the bio if there were any errors, so just return
 			 * here.
 			 */
-			ret = btrfs_submit_compressed_read(inode, bio,
-							   mirror_num,
+			btrfs_submit_compressed_read(inode, bio, mirror_num,
 						     bio_flags);
-			goto out_no_endio;
+			return BLK_STS_OK;
 		} else {
 			/*
 			 * Lookup bio sums does extra checks around whether we
@@ -2644,7 +2643,6 @@ blk_status_t btrfs_submit_data_bio(struct inode *inode, struct bio *bio,
 		bio->bi_status = ret;
 		bio_endio(bio);
 	}
-out_no_endio:
 	return ret;
 }