btrfs: remove unused function btrfs_bio_fits_in_stripe()

As the last caller in compression.c has been removed, we don't need that
function anymore.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ctree.h

@@ -3220,8 +3220,6 @@ void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
 				 struct extent_state *other);
 void btrfs_split_delalloc_extent(struct inode *inode,
 				 struct extent_state *orig, u64 split);
-int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio,
-			     unsigned long bio_flags);
 void btrfs_set_range_writeback(struct btrfs_inode *inode, u64 start, u64 end);
 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf);
 int btrfs_readpage(struct file *file, struct page *page);

fs/btrfs/inode.c

@@ -2233,48 +2233,6 @@ void btrfs_clear_delalloc_extent(struct inode *vfs_inode,
 	}
 }
 
-/*
- * btrfs_bio_fits_in_stripe - Checks whether the size of the given bio will fit
- * in a chunk's stripe. This function ensures that bios do not span a
- * stripe/chunk
- *
- * @page - The page we are about to add to the bio
- * @size - size we want to add to the bio
- * @bio - bio we want to ensure is smaller than a stripe
- * @bio_flags - flags of the bio
- *
- * return 1 if page cannot be added to the bio
- * return 0 if page can be added to the bio
- * return error otherwise
- */
-int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio,
-			     unsigned long bio_flags)
-{
-	struct inode *inode = page->mapping->host;
-	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
-	u64 logical = bio->bi_iter.bi_sector << 9;
-	u32 bio_len = bio->bi_iter.bi_size;
-	struct extent_map *em;
-	int ret = 0;
-	struct btrfs_io_geometry geom;
-
-	if (bio_flags & EXTENT_BIO_COMPRESSED)
-		return 0;
-
-	em = btrfs_get_chunk_map(fs_info, logical, fs_info->sectorsize);
-	if (IS_ERR(em))
-		return PTR_ERR(em);
-	ret = btrfs_get_io_geometry(fs_info, em, btrfs_op(bio), logical, &geom);
-	if (ret < 0)
-		goto out;
-
-	if (geom.len < bio_len + size)
-		ret = 1;
-out:
-	free_extent_map(em);
-	return ret;
-}
-
 /*
  * in order to insert checksums into the metadata in large chunks,
  * we wait until bio submission time.   All the pages in the bio are