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dm: backfill abnormal IO support to non-splitting IO submission 

Otherwise, these abnormal IOs would be sent to the DM target
regardless of whether the target advertised support for them.

Factor out __process_abnormal_io() from __split_and_process_non_flush()
so that discards, write same, etc may be conditionally processed.

Fixes: 978e51ba3 ("dm: optimize bio-based NVMe IO submission")
Cc: stable@vger.kernel.org # 4.16
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2018-03-26 11:49:16 -04:00
parent 880bcce0dc
commit 0519c71e8d
1 changed files with 23 additions and 7 deletions
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30
drivers/md/dm.c
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@ -1477,6 +1477,23 @@ static int __send_write_zeroes(struct clone_info *ci, struct dm_target *ti)
return __send_changing_extent_only(ci, ti, get_num_write_zeroes_bios, NULL);
}
static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti,
int *result)
{
struct bio *bio = ci->bio;
if (bio_op(bio) == REQ_OP_DISCARD)
*result = __send_discard(ci, ti);
else if (bio_op(bio) == REQ_OP_WRITE_SAME)
*result = __send_write_same(ci, ti);
else if (bio_op(bio) == REQ_OP_WRITE_ZEROES)
*result = __send_write_zeroes(ci, ti);
else
return false;
return true;
}
/*
* Select the correct strategy for processing a non-flush bio.
*/
@ -1491,12 +1508,8 @@ static int __split_and_process_non_flush(struct clone_info *ci)
if (!dm_target_is_valid(ti))
return -EIO;
if (unlikely(bio_op(bio) == REQ_OP_DISCARD))
return __send_discard(ci, ti);
else if (unlikely(bio_op(bio) == REQ_OP_WRITE_SAME))
return __send_write_same(ci, ti);
else if (unlikely(bio_op(bio) == REQ_OP_WRITE_ZEROES))
return __send_write_zeroes(ci, ti);
if (unlikely(__process_abnormal_io(ci, ti, &r)))
return r;
if (bio_op(bio) == REQ_OP_ZONE_REPORT)
len = ci->sector_count;
@ -1617,9 +1630,12 @@ static blk_qc_t __process_bio(struct mapped_device *md,
goto out;
}
tio = alloc_tio(&ci, ti, 0, GFP_NOIO);
ci.bio = bio;
ci.sector_count = bio_sectors(bio);
if (unlikely(__process_abnormal_io(&ci, ti, &error)))
goto out;
tio = alloc_tio(&ci, ti, 0, GFP_NOIO);
ret = __clone_and_map_simple_bio(&ci, tio, NULL);
}
out: