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>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 11ff5bb..90b1c1d 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/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 @@ out_unlock:
         * 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