Add block provisioning support for device-mapper targets.
dm-crypt and dm-linear will, by default, passthrough REQ_OP_PROVISION
requests to the underlying device, if supported.
Signed-off-by: Sarthak Kukreti <sarthakkukreti@xxxxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
---
drivers/md/dm-crypt.c | 4 +++-
drivers/md/dm-linear.c | 1 +
drivers/md/dm-table.c | 23 +++++++++++++++++++++++
drivers/md/dm.c | 7 +++++++
include/linux/device-mapper.h | 17 +++++++++++++++++
5 files changed, 51 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 6de107aff331..1d18926ae801 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -3365,6 +3365,8 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
cc->tag_pool_max_sectors <<= cc->sector_shift;
}
+ ti->num_provision_bios = 1;
+
ret = -ENOMEM;
cc->io_queue = alloc_workqueue("kcryptd_io/%s", WQ_MEM_RECLAIM, 1, devname);
if (!cc->io_queue) {
@@ -3419,7 +3421,7 @@ static int crypt_map(struct dm_target *ti, struct bio *bio)
* - for REQ_OP_DISCARD caller must use flush if IO ordering matters
*/
if (unlikely(bio->bi_opf & REQ_PREFLUSH ||
- bio_op(bio) == REQ_OP_DISCARD)) {
+ bio_op(bio) == REQ_OP_DISCARD || bio_op(bio) == REQ_OP_PROVISION)) {
bio_set_dev(bio, cc->dev->bdev);
if (bio_sectors(bio))
bio->bi_iter.bi_sector = cc->start +
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 2d3e186ca87e..8d2dc9dfe93e 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -62,6 +62,7 @@ static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv)
ti->num_discard_bios = 1;
ti->num_secure_erase_bios = 1;
ti->num_write_zeroes_bios = 1;
+ ti->num_provision_bios = 1;
ti->private = lc;
return 0;
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 198d38b53322..f29100fc1a60 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1877,6 +1877,26 @@ static bool dm_table_supports_write_zeroes(struct dm_table *t)
return true;
}
+static int device_provision_capable(struct dm_target *ti, struct dm_dev *dev,
+ sector_t start, sector_t len, void *data)
+{
+ return bdev_max_provision_sectors(dev->bdev);
+}
+
+static bool dm_table_supports_provision(struct dm_table *t)
+{
+ for (unsigned int i = 0; i < t->num_targets; i++) {
+ struct dm_target *ti = dm_table_get_target(t, i);
+
+ if (ti->provision_supported ||
+ (ti->type->iterate_devices &&
+ ti->type->iterate_devices(ti, device_provision_capable, NULL)))
+ return true;
+ }
+
+ return false;
+}
+
static int device_not_nowait_capable(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
@@ -2010,6 +2030,9 @@ int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
if (!dm_table_supports_write_zeroes(t))
q->limits.max_write_zeroes_sectors = 0;
+ if (!dm_table_supports_provision(t))
+ q->limits.max_provision_sectors = 0;
+
dm_table_verify_integrity(t);
/*
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 23c32cd1f1d8..2e207fa0b0f4 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1609,6 +1609,7 @@ static bool is_abnormal_io(struct bio *bio)
case REQ_OP_DISCARD:
case REQ_OP_SECURE_ERASE:
case REQ_OP_WRITE_ZEROES:
+ case REQ_OP_PROVISION:
return true;
default:
break;
@@ -1645,6 +1646,12 @@ static blk_status_t __process_abnormal_io(struct clone_info *ci,
if (ti->max_write_zeroes_granularity)
max_granularity = max_sectors;
break;
+ case REQ_OP_PROVISION:
+ num_bios = ti->num_provision_bios;
+ max_sectors = limits->max_provision_sectors;
+ if (ti->max_provision_granularity)
+ max_granularity = max_sectors;
+ break;
default:
break;
}
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 772ab4d74d94..c1d674d32444 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -333,6 +333,12 @@ struct dm_target {
*/
unsigned int num_write_zeroes_bios;
+ /*
+ * The number of PROVISION bios that will be submitted to the target.
+ * The bio number can be accessed with dm_bio_get_target_bio_nr.
+ */
+ unsigned int num_provision_bios;
+
/*
* The minimum number of extra bytes allocated in each io for the
* target to use.
@@ -357,6 +363,11 @@ struct dm_target {
*/
bool discards_supported:1;
+ /* Set if this target needs to receive provision requests regardless of
+ * whether or not its underlying devices have support.
+ */
+ bool provision_supported:1;
+
/*
* Set if this target requires that discards be split on
* 'max_discard_sectors' boundaries.
@@ -375,6 +386,12 @@ struct dm_target {
*/
bool max_write_zeroes_granularity:1;
+ /*
+ * Set if this target requires that provisions be split on
+ * 'max_provision_sectors' boundaries.
+ */
+ bool max_provision_granularity:1;
+
/*
* Set if we need to limit the number of in-flight bios when swapping.
*/
--
2.39.2
