diff options
| author |   Christoph Hellwig <hch@lst.de> | 2017-04-05 19:21:05 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@fb.com> | 2017-04-08 11:25:38 -0600 |
| commit | ac62d6208a7977107a47be4eb8566d6e5034b5f5 (patch) | |
| tree | cac7e46e26b67193cefb333d9aad2f8e87ecfee7 /drivers/md/dm-table.c | |
| parent | dm io: discards don't take a payload (diff) | |
| download | linux-dev-ac62d6208a7977107a47be4eb8566d6e5034b5f5.tar.xz linux-dev-ac62d6208a7977107a47be4eb8566d6e5034b5f5.zip | |
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 '')
| -rw-r--r-- | drivers/md/dm-table.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 3ad16d9c9d5a..5cd665c91ead 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1533,6 +1533,34 @@ static bool dm_table_supports_write_same(struct dm_table *t) return true; } +static int device_not_write_zeroes_capable(struct dm_target *ti, struct dm_dev *dev, + sector_t start, sector_t len, void *data) +{ + struct request_queue *q = bdev_get_queue(dev->bdev); + + return q && !q->limits.max_write_zeroes_sectors; +} + +static bool dm_table_supports_write_zeroes(struct dm_table *t) +{ + struct dm_target *ti; + unsigned i = 0; + + while (i < dm_table_get_num_targets(t)) { + ti = dm_table_get_target(t, i++); + + if (!ti->num_write_zeroes_bios) + return false; + + if (!ti->type->iterate_devices || + ti->type->iterate_devices(ti, device_not_write_zeroes_capable, NULL)) + return false; + } + + return true; +} + + static int device_discard_capable(struct dm_target *ti, struct dm_dev *dev, sector_t start, sector_t len, void *data) { @@ -1603,6 +1631,8 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, if (!dm_table_supports_write_same(t)) q->limits.max_write_same_sectors = 0; + if (!dm_table_supports_write_zeroes(t)) + q->limits.max_write_zeroes_sectors = 0; if (dm_table_all_devices_attribute(t, queue_supports_sg_merge)) queue_flag_clear_unlocked(QUEUE_FLAG_NO_SG_MERGE, q); |