Next revision of adding support for block provisioning requests.
Changes from v4:
- Add fix for block devices invalidating pagecache if blkdev_fallocate()
is called with an invalid mode.
- s/max_provision_sectors/provision_max_bytes in sysfs.
Sarthak Kukreti (5):
block: Don't invalidate pagecache for invalid falloc modes
block: Introduce provisioning primitives
dm: Add block provisioning support
dm-thin: Add REQ_OP_PROVISION support
loop: Add support for provision requests
block/blk-core.c | 5 +++
block/blk-lib.c | 53 +++++++++++++++++++++++++
block/blk-merge.c | 18 +++++++++
block/blk-settings.c | 19 +++++++++
block/blk-sysfs.c | 9 +++++
block/bounce.c | 1 +
block/fops.c | 28 +++++++++-----
drivers/block/loop.c | 42 ++++++++++++++++++++
drivers/md/dm-crypt.c | 5 ++-
drivers/md/dm-linear.c | 2 +
drivers/md/dm-snap.c | 8 ++++
drivers/md/dm-table.c | 23 +++++++++++
drivers/md/dm-thin.c | 73 ++++++++++++++++++++++++++++++++---
drivers/md/dm.c | 6 +++
include/linux/bio.h | 6 ++-
include/linux/blk_types.h | 5 ++-
include/linux/blkdev.h | 16 ++++++++
include/linux/device-mapper.h | 17 ++++++++
18 files changed, 318 insertions(+), 18 deletions(-)
--
2.40.0.634.g4ca3ef3211-goog
Introduce block request REQ_OP_PROVISION. The intent of this request
is to request underlying storage to preallocate disk space for the given
block range. Block devices that support this capability will export
a provision limit within their request queues.
This patch also adds the capability to call fallocate() in mode 0
on block devices, which will send REQ_OP_PROVISION to the block
device for the specified range,
Signed-off-by: Sarthak Kukreti <[email protected]>
---
block/blk-core.c | 5 ++++
block/blk-lib.c | 53 +++++++++++++++++++++++++++++++++++++++
block/blk-merge.c | 18 +++++++++++++
block/blk-settings.c | 19 ++++++++++++++
block/blk-sysfs.c | 9 +++++++
block/bounce.c | 1 +
block/fops.c | 10 +++++++-
include/linux/bio.h | 6 +++--
include/linux/blk_types.h | 5 +++-
include/linux/blkdev.h | 16 ++++++++++++
10 files changed, 138 insertions(+), 4 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 42926e6cb83c..4a2342ba3a8b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -123,6 +123,7 @@ static const char *const blk_op_name[] = {
REQ_OP_NAME(WRITE_ZEROES),
REQ_OP_NAME(DRV_IN),
REQ_OP_NAME(DRV_OUT),
+ REQ_OP_NAME(PROVISION)
};
#undef REQ_OP_NAME
@@ -798,6 +799,10 @@ void submit_bio_noacct(struct bio *bio)
if (!q->limits.max_write_zeroes_sectors)
goto not_supported;
break;
+ case REQ_OP_PROVISION:
+ if (!q->limits.max_provision_sectors)
+ goto not_supported;
+ break;
default:
break;
}
diff --git a/block/blk-lib.c b/block/blk-lib.c
index e59c3069e835..647b6451660b 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -343,3 +343,56 @@ int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
return ret;
}
EXPORT_SYMBOL(blkdev_issue_secure_erase);
+
+/**
+ * blkdev_issue_provision - provision a block range
+ * @bdev: blockdev to write
+ * @sector: start sector
+ * @nr_sects: number of sectors to provision
+ * @gfp_mask: memory allocation flags (for bio_alloc)
+ *
+ * Description:
+ * Issues a provision request to the block device for the range of sectors.
+ * For thinly provisioned block devices, this acts as a signal for the
+ * underlying storage pool to allocate space for this block range.
+ */
+int blkdev_issue_provision(struct block_device *bdev, sector_t sector,
+ sector_t nr_sects, gfp_t gfp)
+{
+ sector_t bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
+ unsigned int max_sectors = bdev_max_provision_sectors(bdev);
+ struct bio *bio = NULL;
+ struct blk_plug plug;
+ int ret = 0;
+
+ if (max_sectors == 0)
+ return -EOPNOTSUPP;
+ if ((sector | nr_sects) & bs_mask)
+ return -EINVAL;
+ if (bdev_read_only(bdev))
+ return -EPERM;
+
+ blk_start_plug(&plug);
+ for (;;) {
+ unsigned int req_sects = min_t(sector_t, nr_sects, max_sectors);
+
+ bio = blk_next_bio(bio, bdev, 0, REQ_OP_PROVISION, gfp);
+ bio->bi_iter.bi_sector = sector;
+ bio->bi_iter.bi_size = req_sects << SECTOR_SHIFT;
+
+ sector += req_sects;
+ nr_sects -= req_sects;
+ if (!nr_sects) {
+ ret = submit_bio_wait(bio);
+ if (ret == -EOPNOTSUPP)
+ ret = 0;
+ bio_put(bio);
+ break;
+ }
+ cond_resched();
+ }
+ blk_finish_plug(&plug);
+
+ return ret;
+}
+EXPORT_SYMBOL(blkdev_issue_provision);
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 6460abdb2426..a3ffebb97a1d 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -158,6 +158,21 @@ static struct bio *bio_split_write_zeroes(struct bio *bio,
return bio_split(bio, lim->max_write_zeroes_sectors, GFP_NOIO, bs);
}
+static struct bio *bio_split_provision(struct bio *bio,
+ const struct queue_limits *lim,
+ unsigned int *nsegs, struct bio_set *bs)
+{
+ *nsegs = 0;
+
+ if (!lim->max_provision_sectors)
+ return NULL;
+
+ if (bio_sectors(bio) <= lim->max_provision_sectors)
+ return NULL;
+
+ return bio_split(bio, lim->max_provision_sectors, GFP_NOIO, bs);
+}
+
/*
* Return the maximum number of sectors from the start of a bio that may be
* submitted as a single request to a block device. If enough sectors remain,
@@ -366,6 +381,9 @@ struct bio *__bio_split_to_limits(struct bio *bio,
case REQ_OP_WRITE_ZEROES:
split = bio_split_write_zeroes(bio, lim, nr_segs, bs);
break;
+ case REQ_OP_PROVISION:
+ split = bio_split_provision(bio, lim, nr_segs, bs);
+ break;
default:
split = bio_split_rw(bio, lim, nr_segs, bs,
get_max_io_size(bio, lim) << SECTOR_SHIFT);
diff --git a/block/blk-settings.c b/block/blk-settings.c
index 896b4654ab00..d303e6614c36 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -59,6 +59,7 @@ void blk_set_default_limits(struct queue_limits *lim)
lim->zoned = BLK_ZONED_NONE;
lim->zone_write_granularity = 0;
lim->dma_alignment = 511;
+ lim->max_provision_sectors = 0;
}
/**
@@ -82,6 +83,7 @@ void blk_set_stacking_limits(struct queue_limits *lim)
lim->max_dev_sectors = UINT_MAX;
lim->max_write_zeroes_sectors = UINT_MAX;
lim->max_zone_append_sectors = UINT_MAX;
+ lim->max_provision_sectors = UINT_MAX;
}
EXPORT_SYMBOL(blk_set_stacking_limits);
@@ -208,6 +210,20 @@ void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
}
EXPORT_SYMBOL(blk_queue_max_write_zeroes_sectors);
+/**
+ * blk_queue_max_provision_sectors - set max sectors for a single provision
+ *
+ * @q: the request queue for the device
+ * @max_provision_sectors: maximum number of sectors to provision per command
+ **/
+
+void blk_queue_max_provision_sectors(struct request_queue *q,
+ unsigned int max_provision_sectors)
+{
+ q->limits.max_provision_sectors = max_provision_sectors;
+}
+EXPORT_SYMBOL(blk_queue_max_provision_sectors);
+
/**
* blk_queue_max_zone_append_sectors - set max sectors for a single zone append
* @q: the request queue for the device
@@ -578,6 +594,9 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
t->max_segment_size = min_not_zero(t->max_segment_size,
b->max_segment_size);
+ t->max_provision_sectors = min_not_zero(t->max_provision_sectors,
+ b->max_provision_sectors);
+
t->misaligned |= b->misaligned;
alignment = queue_limit_alignment_offset(b, start);
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index f1fce1c7fa44..0a3165211c66 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -213,6 +213,13 @@ static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *pag
return queue_var_show(0, page);
}
+static ssize_t queue_provision_max_show(struct request_queue *q,
+ char *page)
+{
+ return sprintf(page, "%llu\n",
+ (unsigned long long)q->limits.max_provision_sectors << 9);
+}
+
static ssize_t queue_write_same_max_show(struct request_queue *q, char *page)
{
return queue_var_show(0, page);
@@ -604,6 +611,7 @@ QUEUE_RO_ENTRY(queue_discard_max_hw, "discard_max_hw_bytes");
QUEUE_RW_ENTRY(queue_discard_max, "discard_max_bytes");
QUEUE_RO_ENTRY(queue_discard_zeroes_data, "discard_zeroes_data");
+QUEUE_RO_ENTRY(queue_provision_max, "provision_max_bytes");
QUEUE_RO_ENTRY(queue_write_same_max, "write_same_max_bytes");
QUEUE_RO_ENTRY(queue_write_zeroes_max, "write_zeroes_max_bytes");
QUEUE_RO_ENTRY(queue_zone_append_max, "zone_append_max_bytes");
@@ -661,6 +669,7 @@ static struct attribute *queue_attrs[] = {
&queue_discard_max_entry.attr,
&queue_discard_max_hw_entry.attr,
&queue_discard_zeroes_data_entry.attr,
+ &queue_provision_max_entry.attr,
&queue_write_same_max_entry.attr,
&queue_write_zeroes_max_entry.attr,
&queue_zone_append_max_entry.attr,
diff --git a/block/bounce.c b/block/bounce.c
index 7cfcb242f9a1..ab9d8723ae64 100644
--- a/block/bounce.c
+++ b/block/bounce.c
@@ -176,6 +176,7 @@ static struct bio *bounce_clone_bio(struct bio *bio_src)
case REQ_OP_DISCARD:
case REQ_OP_SECURE_ERASE:
case REQ_OP_WRITE_ZEROES:
+ case REQ_OP_PROVISION:
break;
default:
bio_for_each_segment(bv, bio_src, iter)
diff --git a/block/fops.c b/block/fops.c
index 2fd7e8b9ab48..16420c5fe4a2 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -613,7 +613,8 @@ static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
#define BLKDEV_FALLOC_FL_SUPPORTED \
(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \
- FALLOC_FL_ZERO_RANGE | FALLOC_FL_NO_HIDE_STALE)
+ FALLOC_FL_ZERO_RANGE | FALLOC_FL_NO_HIDE_STALE | \
+ FALLOC_FL_UNSHARE_RANGE)
static long blkdev_fallocate(struct file *file, int mode, loff_t start,
loff_t len)
@@ -653,6 +654,13 @@ static long blkdev_fallocate(struct file *file, int mode, loff_t start,
* de-allocate mode calls to fallocate().
*/
switch (mode) {
+ case 0:
+ case FALLOC_FL_UNSHARE_RANGE:
+ case FALLOC_FL_KEEP_SIZE:
+ case FALLOC_FL_UNSHARE_RANGE | FALLOC_FL_KEEP_SIZE:
+ error = blkdev_issue_provision(bdev, start >> SECTOR_SHIFT,
+ len >> SECTOR_SHIFT, GFP_KERNEL);
+ break;
case FALLOC_FL_ZERO_RANGE:
case FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE:
error = truncate_bdev_range(bdev, file->f_mode, start, end) ||
diff --git a/include/linux/bio.h b/include/linux/bio.h
index d766be7152e1..9820b3b039f2 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -57,7 +57,8 @@ static inline bool bio_has_data(struct bio *bio)
bio->bi_iter.bi_size &&
bio_op(bio) != REQ_OP_DISCARD &&
bio_op(bio) != REQ_OP_SECURE_ERASE &&
- bio_op(bio) != REQ_OP_WRITE_ZEROES)
+ bio_op(bio) != REQ_OP_WRITE_ZEROES &&
+ bio_op(bio) != REQ_OP_PROVISION)
return true;
return false;
@@ -67,7 +68,8 @@ static inline bool bio_no_advance_iter(const struct bio *bio)
{
return bio_op(bio) == REQ_OP_DISCARD ||
bio_op(bio) == REQ_OP_SECURE_ERASE ||
- bio_op(bio) == REQ_OP_WRITE_ZEROES;
+ bio_op(bio) == REQ_OP_WRITE_ZEROES ||
+ bio_op(bio) == REQ_OP_PROVISION;
}
static inline void *bio_data(struct bio *bio)
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 99be590f952f..27bdf88f541c 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -385,7 +385,10 @@ enum req_op {
REQ_OP_DRV_IN = (__force blk_opf_t)34,
REQ_OP_DRV_OUT = (__force blk_opf_t)35,
- REQ_OP_LAST = (__force blk_opf_t)36,
+ /* request device to provision block */
+ REQ_OP_PROVISION = (__force blk_opf_t)37,
+
+ REQ_OP_LAST = (__force blk_opf_t)38,
};
enum req_flag_bits {
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 941304f17492..239e2f418b6e 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -303,6 +303,7 @@ struct queue_limits {
unsigned int discard_granularity;
unsigned int discard_alignment;
unsigned int zone_write_granularity;
+ unsigned int max_provision_sectors;
unsigned short max_segments;
unsigned short max_integrity_segments;
@@ -921,6 +922,8 @@ extern void blk_queue_max_discard_sectors(struct request_queue *q,
unsigned int max_discard_sectors);
extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
unsigned int max_write_same_sectors);
+extern void blk_queue_max_provision_sectors(struct request_queue *q,
+ unsigned int max_provision_sectors);
extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
unsigned int max_zone_append_sectors);
@@ -1060,6 +1063,9 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp);
+extern int blkdev_issue_provision(struct block_device *bdev, sector_t sector,
+ sector_t nr_sects, gfp_t gfp_mask);
+
#define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */
#define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
@@ -1139,6 +1145,11 @@ static inline unsigned short queue_max_discard_segments(const struct request_que
return q->limits.max_discard_segments;
}
+static inline unsigned short queue_max_provision_sectors(const struct request_queue *q)
+{
+ return q->limits.max_provision_sectors;
+}
+
static inline unsigned int queue_max_segment_size(const struct request_queue *q)
{
return q->limits.max_segment_size;
@@ -1281,6 +1292,11 @@ static inline bool bdev_nowait(struct block_device *bdev)
return test_bit(QUEUE_FLAG_NOWAIT, &bdev_get_queue(bdev)->queue_flags);
}
+static inline unsigned int bdev_max_provision_sectors(struct block_device *bdev)
+{
+ return bdev_get_queue(bdev)->limits.max_provision_sectors;
+}
+
static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
{
return blk_queue_zoned_model(bdev_get_queue(bdev));
--
2.40.0.634.g4ca3ef3211-goog
Add block provisioning support for device-mapper targets.
dm-crypt, dm-snap and dm-linear will, by default, passthrough
REQ_OP_PROVISION requests to the underlying device, if
supported.
Signed-off-by: Sarthak Kukreti <[email protected]>
---
drivers/md/dm-crypt.c | 5 ++++-
drivers/md/dm-linear.c | 2 ++
drivers/md/dm-snap.c | 8 ++++++++
drivers/md/dm-table.c | 23 +++++++++++++++++++++++
drivers/md/dm.c | 6 ++++++
include/linux/device-mapper.h | 17 +++++++++++++++++
6 files changed, 60 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 8b47b913ee83..aa8072d6d7bf 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -3336,6 +3336,9 @@ 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;
+ ti->provision_supported = true;
+
ret = -ENOMEM;
cc->io_queue = alloc_workqueue("kcryptd_io/%s", WQ_MEM_RECLAIM, 1, devname);
if (!cc->io_queue) {
@@ -3390,7 +3393,7 @@ 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 f4448d520ee9..66e50f5b0665 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -62,6 +62,8 @@ 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->provision_supported = true;
ti->private = lc;
return 0;
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 9c49f53760d0..07927bb1e711 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -1358,6 +1358,8 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
if (s->discard_zeroes_cow)
ti->num_discard_bios = (s->discard_passdown_origin ? 2 : 1);
ti->per_io_data_size = sizeof(struct dm_snap_tracked_chunk);
+ ti->num_provision_bios = 1;
+ ti->provision_supported = true;
/* Add snapshot to the list of snapshots for this origin */
/* Exceptions aren't triggered till snapshot_resume() is called */
@@ -2003,6 +2005,11 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio)
/* If the block is already remapped - use that, else remap it */
e = dm_lookup_exception(&s->complete, chunk);
if (e) {
+ if (unlikely(bio_op(bio) == REQ_OP_PROVISION)) {
+ bio_endio(bio);
+ r = DM_MAPIO_SUBMITTED;
+ goto out_unlock;
+ }
remap_exception(s, e, bio, chunk);
if (unlikely(bio_op(bio) == REQ_OP_DISCARD) &&
io_overlaps_chunk(s, bio)) {
@@ -2413,6 +2420,7 @@ static void snapshot_io_hints(struct dm_target *ti, struct queue_limits *limits)
/* All discards are split on chunk_size boundary */
limits->discard_granularity = snap->store->chunk_size;
limits->max_discard_sectors = snap->store->chunk_size;
+ limits->max_provision_sectors = snap->store->chunk_size;
up_read(&_origins_lock);
}
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 119db5e01080..9301f050529f 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1854,6 +1854,26 @@ 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)
{
@@ -1987,6 +2007,9 @@ 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 3b694ba3a106..9b94121b8d38 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;
@@ -1641,6 +1642,11 @@ static blk_status_t __process_abnormal_io(struct clone_info *ci,
if (ti->max_write_zeroes_granularity)
max_granularity = limits->max_write_zeroes_sectors;
break;
+ case REQ_OP_PROVISION:
+ num_bios = ti->num_provision_bios;
+ if (ti->max_provision_granularity)
+ max_granularity = limits->max_provision_sectors;
+ break;
default:
break;
}
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index a52d2b9a6846..9981378457d2 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -334,6 +334,12 @@ 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.
@@ -358,6 +364,11 @@ 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.
@@ -376,6 +387,12 @@ 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.
*/
--
2.40.0.634.g4ca3ef3211-goog