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dm: fix REQ_OP_ZONE_REPORT bio handling 

A REQ_OP_ZONE_REPORT bio is not a medium access command.  Its number of
sectors indicates the maximum size allowed for the report reply size and
not an amount of sectors accessed from the device.  REQ_OP_ZONE_REPORT
bios should thus not be split depending on the target device maximum I/O
length but passed as-is.  Note that it is the responsability of the
target to remap and format the report reply.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Damien Le Moal 2017-05-08 16:40:47 -07:00 committed by Mike Snitzer
parent a4aa5e56e5
commit 264c869d44
1 changed files with 7 additions and 2 deletions
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9
drivers/md/dm.c
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@ -1152,7 +1152,8 @@ static int clone_bio(struct dm_target_io *tio, struct bio *bio,
return r;
}
bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector));
if (bio_op(bio) != REQ_OP_ZONE_REPORT)
bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector));
clone->bi_iter.bi_size = to_bytes(len);
if (unlikely(bio_integrity(bio) != NULL))
@ -1341,7 +1342,11 @@ static int __split_and_process_non_flush(struct clone_info *ci)
if (!dm_target_is_valid(ti))
return -EIO;
len = min_t(sector_t, max_io_len(ci->sector, ti), ci->sector_count);
if (bio_op(bio) == REQ_OP_ZONE_REPORT)
len = ci->sector_count;
else
len = min_t(sector_t, max_io_len(ci->sector, ti),
ci->sector_count);
r = __clone_and_map_data_bio(ci, ti, ci->sector, &len);
if (r < 0)