- /*
- * Wait far any ordered extent that covers our extent map. If it
- * finishes without an error, first check and see if our csums are on
- * our outstanding ordered extents.
- */
- list_for_each_entry(ordered, logged_list, log_list) {
- struct btrfs_ordered_sum *sum;
-
- if (!mod_len)
- break;
-
- if (ordered->file_offset + ordered->len <= mod_start ||
- mod_start + mod_len <= ordered->file_offset)
- continue;
-
- if (!test_bit(BTRFS_ORDERED_IO_DONE, &ordered->flags) &&
- !test_bit(BTRFS_ORDERED_IOERR, &ordered->flags) &&
- !test_bit(BTRFS_ORDERED_DIRECT, &ordered->flags)) {
- const u64 start = ordered->file_offset;
- const u64 end = ordered->file_offset + ordered->len - 1;
-
- WARN_ON(ordered->inode != inode);
- filemap_fdatawrite_range(inode->i_mapping, start, end);
- }
-
- wait_event(ordered->wait,
- (test_bit(BTRFS_ORDERED_IO_DONE, &ordered->flags) ||
- test_bit(BTRFS_ORDERED_IOERR, &ordered->flags)));
-
- if (test_bit(BTRFS_ORDERED_IOERR, &ordered->flags)) {
- /*
- * Clear the AS_EIO/AS_ENOSPC flags from the inode's
- * i_mapping flags, so that the next fsync won't get
- * an outdated io error too.
- */
- filemap_check_errors(inode->i_mapping);
- *ordered_io_error = true;
- break;
- }
- /*
- * We are going to copy all the csums on this ordered extent, so
- * go ahead and adjust mod_start and mod_len in case this
- * ordered extent has already been logged.
- */
- if (ordered->file_offset > mod_start) {
- if (ordered->file_offset + ordered->len >=
- mod_start + mod_len)
- mod_len = ordered->file_offset - mod_start;
- /*
- * If we have this case
- *
- * |--------- logged extent ---------|
- * |----- ordered extent ----|
- *
- * Just don't mess with mod_start and mod_len, we'll
- * just end up logging more csums than we need and it
- * will be ok.
- */
- } else {
- if (ordered->file_offset + ordered->len <
- mod_start + mod_len) {
- mod_len = (mod_start + mod_len) -
- (ordered->file_offset + ordered->len);
- mod_start = ordered->file_offset +
- ordered->len;
- } else {
- mod_len = 0;
- }
- }
-
- if (skip_csum)
- continue;
-
- /*
- * To keep us from looping for the above case of an ordered
- * extent that falls inside of the logged extent.
- */
- if (test_and_set_bit(BTRFS_ORDERED_LOGGED_CSUM,
- &ordered->flags))
- continue;
-
- list_for_each_entry(sum, &ordered->list, list) {
- ret = btrfs_csum_file_blocks(trans, log, sum);
- if (ret)
- break;
- }
- }
-
- if (*ordered_io_error || !mod_len || ret || skip_csum)
- return ret;
-