4.16-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mike Snitzer <snitzer@xxxxxxxxxx>
commit 0519c71e8d461ac3ef9a555bb7339243c9128d37 upstream.
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@xxxxxxxxxxxxxxx # 4.16
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm.c | 30 +++++++++++++++++++++++-------
1 file changed, 23 insertions(+), 7 deletions(-)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1477,6 +1477,23 @@ static int __send_write_zeroes(struct cl
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
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 map
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: