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authorChristoph Hellwig <hch@lst.de>2017-04-05 20:21:05 +0300
committerJens Axboe <axboe@fb.com>2017-04-08 20:25:38 +0300
commitac62d6208a7977107a47be4eb8566d6e5034b5f5 (patch)
treecac7e46e26b67193cefb333d9aad2f8e87ecfee7 /drivers/md/dm-io.c
parent0f5d690f7bf1b1a5354c61ac5b9d69a4329e218f (diff)
downloadlinux-ac62d6208a7977107a47be4eb8566d6e5034b5f5.tar.xz
dm: support REQ_OP_WRITE_ZEROES
Copy & paste from the REQ_OP_WRITE_SAME code. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/md/dm-io.c')
-rw-r--r--drivers/md/dm-io.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/md/dm-io.c b/drivers/md/dm-io.c
index b808cbe22678..3702e502466d 100644
--- a/drivers/md/dm-io.c
+++ b/drivers/md/dm-io.c
@@ -312,9 +312,12 @@ static void do_region(int op, int op_flags, unsigned region,
*/
if (op == REQ_OP_DISCARD)
special_cmd_max_sectors = q->limits.max_discard_sectors;
+ else if (op == REQ_OP_WRITE_ZEROES)
+ special_cmd_max_sectors = q->limits.max_write_zeroes_sectors;
else if (op == REQ_OP_WRITE_SAME)
special_cmd_max_sectors = q->limits.max_write_same_sectors;
- if ((op == REQ_OP_DISCARD || op == REQ_OP_WRITE_SAME) &&
+ if ((op == REQ_OP_DISCARD || op == REQ_OP_WRITE_ZEROES ||
+ op == REQ_OP_WRITE_SAME) &&
special_cmd_max_sectors == 0) {
dec_count(io, region, -EOPNOTSUPP);
return;
@@ -330,6 +333,7 @@ static void do_region(int op, int op_flags, unsigned region,
*/
switch (op) {
case REQ_OP_DISCARD:
+ case REQ_OP_WRITE_ZEROES:
num_bvecs = 0;
break;
case REQ_OP_WRITE_SAME:
@@ -347,7 +351,7 @@ static void do_region(int op, int op_flags, unsigned region,
bio_set_op_attrs(bio, op, op_flags);
store_io_and_region_in_bio(bio, io, region);
- if (op == REQ_OP_DISCARD) {
+ if (op == REQ_OP_DISCARD || op == REQ_OP_WRITE_ZEROES) {
num_sectors = min_t(sector_t, special_cmd_max_sectors, remaining);
bio->bi_iter.bi_size = num_sectors << SECTOR_SHIFT;
remaining -= num_sectors;