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Tsirkin" , Jason Wang , Stefan Hajnoczi , Alasdair Kergon , Mike Snitzer , Christoph Hellwig , Brian Foster , Theodore Ts'o , Andreas Dilger , Bart Van Assche , "Darrick J. Wong" Subject: [PATCH v7 3/5] dm: Add block provisioning support Date: Thu, 18 May 2023 15:33:24 -0700 Message-ID: <20230518223326.18744-4-sarthakkukreti@chromium.org> X-Mailer: git-send-email 2.40.1.698.g37aff9b760-goog In-Reply-To: <20230518223326.18744-1-sarthakkukreti@chromium.org> References: <20230518223326.18744-1-sarthakkukreti@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- drivers/md/dm-crypt.c | 4 +++- drivers/md/dm-linear.c | 1 + drivers/md/dm-snap.c | 7 +++++++ drivers/md/dm-table.c | 23 +++++++++++++++++++++++ drivers/md/dm.c | 6 ++++++ include/linux/device-mapper.h | 17 +++++++++++++++++ 6 files changed, 57 insertions(+), 1 deletion(-) diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index 8b47b913ee83..5a7c475ce6fc 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -3336,6 +3336,8 @@ 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) { @@ -3390,7 +3392,7 @@ 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..74ee27ca551a 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-snap.c b/drivers/md/dm-snap.c index 9c49f53760d0..0dfda50ac4e0 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -1358,6 +1358,7 @@ 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; /* Add snapshot to the list of snapshots for this origin */ /* Exceptions aren't triggered till snapshot_resume() is called */ @@ -2003,6 +2004,11 @@ 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 +2419,7 @@ 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 1398f1d6e83e..4b2998c1e1dc 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1845,6 +1845,26 @@ 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) { @@ -1978,6 +1998,9 @@ 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. */ -- 2.40.1.698.g37aff9b760-goog