btrfs: fix direct I/O read repair for split bios

btrfs: fix direct I/O read repair for split bios

When a bio is split in btrfs_submit_direct, dip->file_offset contains
the file offset for the first bio.  But this means the start value used
in btrfs_check_read_dio_bio is incorrect for subsequent bios.  Add
a file_offset field to struct btrfs_bio to pass along the correct offset.

Given that check_data_csum only uses start of an error message this
means problems with this miscalculation will only show up when I/O fails
or checksums mismatch.

The logic was removed in f4f39fc5dc30 ("btrfs: remove btrfs_bio::logical
member") but we need it due to the bio splitting.

CC: [email protected] # 5.16+
Reviewed-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Naohiro Aota <[email protected]>
Reviewed-by: Qu Wenruo <[email protected]>
Reviewed-by: Sweet Tea Dorminy <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: David Sterba <[email protected]>