btrfs: fix error handling of fallback uncompress write

When cow_file_range() fails in the middle of the allocation loop, it
unlocks the pages but leaves the ordered extents intact. Thus, we need
to call btrfs_cleanup_ordered_extents() to finish the created ordered
extents.

Also, we need to call end_extent_writepage() if locked_page is available
because btrfs_cleanup_ordered_extents() never processes the region on
the locked_page.

Furthermore, we need to set the mapping as error if locked_page is
unavailable before unlocking the pages, so that the errno is properly
propagated to the user space.

CC: stable@vger.kernel.org # 5.18+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/inode.c

@@ -928,8 +928,18 @@ static int submit_uncompressed_range(struct btrfs_inode *inode,
 		goto out;
 	}
 	if (ret < 0) {
-		if (locked_page)
+		btrfs_cleanup_ordered_extents(inode, locked_page, start, end - start + 1);
+		if (locked_page) {
+			const u64 page_start = page_offset(locked_page);
+			const u64 page_end = page_start + PAGE_SIZE - 1;
+
+			btrfs_page_set_error(inode->root->fs_info, locked_page,
+					     page_start, PAGE_SIZE);
+			set_page_writeback(locked_page);
+			end_page_writeback(locked_page);
+			end_extent_writepage(locked_page, ret, page_start, page_end);
 			unlock_page(locked_page);
+		}
 		goto out;
 	}
 
@@ -1378,9 +1388,12 @@ static noinline int cow_file_range(struct btrfs_inode *inode,
 	 * However, in case of unlock == 0, we still need to unlock the pages
 	 * (except @locked_page) to ensure all the pages are unlocked.
 	 */
-	if (!unlock && orig_start < start)
+	if (!unlock && orig_start < start) {
+		if (!locked_page)
+			mapping_set_error(inode->vfs_inode.i_mapping, ret);
 		extent_clear_unlock_delalloc(inode, orig_start, start - 1,
 					     locked_page, 0, page_ops);
+	}
 
 	/*
 	 * For the range (2). If we reserved an extent for our delalloc range