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Mike Snitzer authored
The intent behind commit e6fc9f62 ("dm: flag clones created by __send_duplicate_bios") was to formally disallow the use of dm_accept_partial_bio() where it simply isn't possible -- due to constraint that multiple bios cannot meaningfully update a shared tio->len_ptr. But that commit went too far and disallowed the case where "abormal" IO (e.g. WRITE_ZEROES) is only using a single bio. Fix this by not marking a dm_io with a single dm_target_io (and bio), that happens to be created by __send_duplicate_bios, as DM_TIO_IS_DUPLICATE_BIO. Also remove 'unsigned *len' parameter from alloc_multiple_bios(). This commit fixes a dm_accept_partial_bio() BUG_ON() with dm-zoned when a WRITE_ZEROES bio is issued. Fixes: 655f3aad ("dm: switch dm_target_io booleans over to proper flags") Reported-by:
Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com> Reviewed-by:
Damien Le Moal <damien.lemoal@opensource.wdc.com> Signed-off-by:
Mike Snitzer <snitzer@kernel.org>
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