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dm: remove legacy request-based IO path

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dm supports both, and since we're killing off the legacy path in
general, get rid of it in dm.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Jens Axboe 2018-10-10 20:49:26 -06:00 committed by Mike Snitzer
parent 118aa47c70
commit 6a23e05c2f
9 changed files with 36 additions and 393 deletions
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11
drivers/md/Kconfig
View File

@ -215,17 +215,6 @@ config BLK_DEV_DM
If unsure, say N.
config DM_MQ_DEFAULT
bool "request-based DM: use blk-mq I/O path by default"
depends on BLK_DEV_DM
---help---
This option enables the blk-mq based I/O path for request-based
DM devices by default. With the option the dm_mod.use_blk_mq
module/boot option defaults to Y, without it to N, but it can
still be overriden either way.
If unsure say N.
config DM_DEBUG
bool "Device mapper debugging support"
depends on BLK_DEV_DM

10
drivers/md/dm-core.h
View File

@ -112,18 +112,8 @@ struct mapped_device {
struct dm_stats stats;
struct kthread_worker kworker;
struct task_struct *kworker_task;
/* for request-based merge heuristic in dm_request_fn() */
unsigned seq_rq_merge_deadline_usecs;
int last_rq_rw;
sector_t last_rq_pos;
ktime_t last_rq_start_time;
/* for blk-mq request-based DM support */
struct blk_mq_tag_set *tag_set;
bool use_blk_mq:1;
bool init_tio_pdu:1;
struct srcu_struct io_barrier;

10
drivers/md/dm-mpath.c
View File

@ -203,14 +203,7 @@ static struct multipath *alloc_multipath(struct dm_target *ti)
static int alloc_multipath_stage2(struct dm_target *ti, struct multipath *m)
{
if (m->queue_mode == DM_TYPE_NONE) {
/*
* Default to request-based.
*/
if (dm_use_blk_mq(dm_table_get_md(ti->table)))
m->queue_mode = DM_TYPE_MQ_REQUEST_BASED;
else
m->queue_mode = DM_TYPE_REQUEST_BASED;
} else if (m->queue_mode == DM_TYPE_BIO_BASED) {
INIT_WORK(&m->process_queued_bios, process_queued_bios);
/*
@ -537,10 +530,7 @@ static int multipath_clone_and_map(struct dm_target *ti, struct request *rq,
* get the queue busy feedback (via BLK_STS_RESOURCE),
* otherwise I/O merging can suffer.
*/
if (q->mq_ops)
return DM_MAPIO_REQUEUE;
else
return DM_MAPIO_DELAY_REQUEUE;
}
clone->bio = clone->biotail = NULL;
clone->rq_disk = bdev->bd_disk;

304
drivers/md/dm-rq.c
View File

@ -23,19 +23,6 @@ static unsigned dm_mq_queue_depth = DM_MQ_QUEUE_DEPTH;
#define RESERVED_REQUEST_BASED_IOS 256
static unsigned reserved_rq_based_ios = RESERVED_REQUEST_BASED_IOS;
static bool use_blk_mq = IS_ENABLED(CONFIG_DM_MQ_DEFAULT);
bool dm_use_blk_mq_default(void)
{
return use_blk_mq;
}
bool dm_use_blk_mq(struct mapped_device *md)
{
return md->use_blk_mq;
}
EXPORT_SYMBOL_GPL(dm_use_blk_mq);
unsigned dm_get_reserved_rq_based_ios(void)
{
return __dm_get_module_param(&reserved_rq_based_ios,
@ -59,41 +46,13 @@ int dm_request_based(struct mapped_device *md)
return queue_is_rq_based(md->queue);
}
static void dm_old_start_queue(struct request_queue *q)
{
unsigned long flags;
spin_lock_irqsave(q->queue_lock, flags);
if (blk_queue_stopped(q))
blk_start_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
}
static void dm_mq_start_queue(struct request_queue *q)
void dm_start_queue(struct request_queue *q)
{
blk_mq_unquiesce_queue(q);
blk_mq_kick_requeue_list(q);
}
void dm_start_queue(struct request_queue *q)
{
if (!q->mq_ops)
dm_old_start_queue(q);
else
dm_mq_start_queue(q);
}
static void dm_old_stop_queue(struct request_queue *q)
{
unsigned long flags;
spin_lock_irqsave(q->queue_lock, flags);
if (!blk_queue_stopped(q))
blk_stop_queue(q);
spin_unlock_irqrestore(q->queue_lock, flags);
}
static void dm_mq_stop_queue(struct request_queue *q)
void dm_stop_queue(struct request_queue *q)
{
if (blk_mq_queue_stopped(q))
return;
@ -101,14 +60,6 @@ static void dm_mq_stop_queue(struct request_queue *q)
blk_mq_quiesce_queue(q);
}
void dm_stop_queue(struct request_queue *q)
{
if (!q->mq_ops)
dm_old_stop_queue(q);
else
dm_mq_stop_queue(q);
}
/*
* Partial completion handling for request-based dm
*/
@ -179,27 +130,12 @@ static void rq_end_stats(struct mapped_device *md, struct request *orig)
*/
static void rq_completed(struct mapped_device *md, int rw, bool run_queue)
{
struct request_queue *q = md->queue;
unsigned long flags;
atomic_dec(&md->pending[rw]);
/* nudge anyone waiting on suspend queue */
if (!md_in_flight(md))
wake_up(&md->wait);
/*
* Run this off this callpath, as drivers could invoke end_io while
* inside their request_fn (and holding the queue lock). Calling
* back into ->request_fn() could deadlock attempting to grab the
* queue lock again.
*/
if (!q->mq_ops && run_queue) {
spin_lock_irqsave(q->queue_lock, flags);
blk_run_queue_async(q);
spin_unlock_irqrestore(q->queue_lock, flags);
}
/*
* dm_put() must be at the end of this function. See the comment above
*/
@ -222,27 +158,10 @@ static void dm_end_request(struct request *clone, blk_status_t error)
tio->ti->type->release_clone_rq(clone);
rq_end_stats(md, rq);
if (!rq->q->mq_ops)
blk_end_request_all(rq, error);
else
blk_mq_end_request(rq, error);
rq_completed(md, rw, true);
}
/*
* Requeue the original request of a clone.
*/
static void dm_old_requeue_request(struct request *rq, unsigned long delay_ms)
{
struct request_queue *q = rq->q;
unsigned long flags;
spin_lock_irqsave(q->queue_lock, flags);
blk_requeue_request(q, rq);
blk_delay_queue(q, delay_ms);
spin_unlock_irqrestore(q->queue_lock, flags);
}
static void __dm_mq_kick_requeue_list(struct request_queue *q, unsigned long msecs)
{
blk_mq_delay_kick_requeue_list(q, msecs);
@ -273,11 +192,7 @@ static void dm_requeue_original_request(struct dm_rq_target_io *tio, bool delay_
tio->ti->type->release_clone_rq(tio->clone);
}
if (!rq->q->mq_ops)
dm_old_requeue_request(rq, delay_ms);
else
dm_mq_delay_requeue_request(rq, delay_ms);
rq_completed(md, rw, false);
}
@ -340,9 +255,6 @@ static void dm_softirq_done(struct request *rq)
rq_end_stats(md, rq);
rw = rq_data_dir(rq);
if (!rq->q->mq_ops)
blk_end_request_all(rq, tio->error);
else
blk_mq_end_request(rq, tio->error);
rq_completed(md, rw, false);
return;
@ -363,9 +275,6 @@ static void dm_complete_request(struct request *rq, blk_status_t error)
struct dm_rq_target_io *tio = tio_from_request(rq);
tio->error = error;
if (!rq->q->mq_ops)
blk_complete_request(rq);
else
blk_mq_complete_request(rq);
}
@ -373,7 +282,7 @@ static void dm_complete_request(struct request *rq, blk_status_t error)
* Complete the not-mapped clone and the original request with the error status
* through softirq context.
* Target's rq_end_io() function isn't called.
* This may be used when the target's map_rq() or clone_and_map_rq() functions fail.
* This may be used when the target's clone_and_map_rq() function fails.
*/
static void dm_kill_unmapped_request(struct request *rq, blk_status_t error)
{
@ -381,21 +290,10 @@ static void dm_kill_unmapped_request(struct request *rq, blk_status_t error)
dm_complete_request(rq, error);
}
/*
* Called with the clone's queue lock held (in the case of .request_fn)
*/
static void end_clone_request(struct request *clone, blk_status_t error)
{
struct dm_rq_target_io *tio = clone->end_io_data;
/*
* Actual request completion is done in a softirq context which doesn't
* hold the clone's queue lock. Otherwise, deadlock could occur because:
* - another request may be submitted by the upper level driver
* of the stacking during the completion
* - the submission which requires queue lock may be done
* against this clone's queue
*/
dm_complete_request(tio->orig, error);
}
@ -446,8 +344,6 @@ static int setup_clone(struct request *clone, struct request *rq,
return 0;
}
static void map_tio_request(struct kthread_work *work);
static void init_tio(struct dm_rq_target_io *tio, struct request *rq,
struct mapped_device *md)
{
@ -464,8 +360,6 @@ static void init_tio(struct dm_rq_target_io *tio, struct request *rq,
*/
if (!md->init_tio_pdu)
memset(&tio->info, 0, sizeof(tio->info));
if (md->kworker_task)
kthread_init_work(&tio->work, map_tio_request);
}
/*
@ -504,9 +398,6 @@ check_again:
blk_rq_unprep_clone(clone);
tio->ti->type->release_clone_rq(clone);
tio->clone = NULL;
if (!rq->q->mq_ops)
r = DM_MAPIO_DELAY_REQUEUE;
else
r = DM_MAPIO_REQUEUE;
goto check_again;
}
@ -530,20 +421,23 @@ check_again:
return r;
}
/* DEPRECATED: previously used for request-based merge heuristic in dm_request_fn() */
ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf)
{
return sprintf(buf, "%u\n", 0);
}
ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
const char *buf, size_t count)
{
return count;
}
static void dm_start_request(struct mapped_device *md, struct request *orig)
{
if (!orig->q->mq_ops)
blk_start_request(orig);
else
blk_mq_start_request(orig);
atomic_inc(&md->pending[rq_data_dir(orig)]);
if (md->seq_rq_merge_deadline_usecs) {
md->last_rq_pos = rq_end_sector(orig);
md->last_rq_rw = rq_data_dir(orig);
md->last_rq_start_time = ktime_get();
}
if (unlikely(dm_stats_used(&md->stats))) {
struct dm_rq_target_io *tio = tio_from_request(orig);
tio->duration_jiffies = jiffies;
@ -563,8 +457,10 @@ static void dm_start_request(struct mapped_device *md, struct request *orig)
dm_get(md);
}
static int __dm_rq_init_rq(struct mapped_device *md, struct request *rq)
static int dm_mq_init_request(struct blk_mq_tag_set *set, struct request *rq,
unsigned int hctx_idx, unsigned int numa_node)
{
struct mapped_device *md = set->driver_data;
struct dm_rq_target_io *tio = blk_mq_rq_to_pdu(rq);
/*
@ -581,163 +477,6 @@ static int __dm_rq_init_rq(struct mapped_device *md, struct request *rq)
return 0;
}
static int dm_rq_init_rq(struct request_queue *q, struct request *rq, gfp_t gfp)
{
return __dm_rq_init_rq(q->rq_alloc_data, rq);
}
static void map_tio_request(struct kthread_work *work)
{
struct dm_rq_target_io *tio = container_of(work, struct dm_rq_target_io, work);
if (map_request(tio) == DM_MAPIO_REQUEUE)
dm_requeue_original_request(tio, false);
}
ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf)
{
return sprintf(buf, "%u\n", md->seq_rq_merge_deadline_usecs);
}
#define MAX_SEQ_RQ_MERGE_DEADLINE_USECS 100000
ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
const char *buf, size_t count)
{
unsigned deadline;
if (dm_get_md_type(md) != DM_TYPE_REQUEST_BASED)
return count;
if (kstrtouint(buf, 10, &deadline))
return -EINVAL;
if (deadline > MAX_SEQ_RQ_MERGE_DEADLINE_USECS)
deadline = MAX_SEQ_RQ_MERGE_DEADLINE_USECS;
md->seq_rq_merge_deadline_usecs = deadline;
return count;
}
static bool dm_old_request_peeked_before_merge_deadline(struct mapped_device *md)
{
ktime_t kt_deadline;
if (!md->seq_rq_merge_deadline_usecs)
return false;
kt_deadline = ns_to_ktime((u64)md->seq_rq_merge_deadline_usecs * NSEC_PER_USEC);
kt_deadline = ktime_add_safe(md->last_rq_start_time, kt_deadline);
return !ktime_after(ktime_get(), kt_deadline);
}
/*
* q->request_fn for old request-based dm.
* Called with the queue lock held.
*/
static void dm_old_request_fn(struct request_queue *q)
{
struct mapped_device *md = q->queuedata;
struct dm_target *ti = md->immutable_target;
struct request *rq;
struct dm_rq_target_io *tio;
sector_t pos = 0;
if (unlikely(!ti)) {
int srcu_idx;
struct dm_table *map = dm_get_live_table(md, &srcu_idx);
if (unlikely(!map)) {
dm_put_live_table(md, srcu_idx);
return;
}
ti = dm_table_find_target(map, pos);
dm_put_live_table(md, srcu_idx);
}
/*
* For suspend, check blk_queue_stopped() and increment
* ->pending within a single queue_lock not to increment the
* number of in-flight I/Os after the queue is stopped in
* dm_suspend().
*/
while (!blk_queue_stopped(q)) {
rq = blk_peek_request(q);
if (!rq)
return;
/* always use block 0 to find the target for flushes for now */
pos = 0;
if (req_op(rq) != REQ_OP_FLUSH)
pos = blk_rq_pos(rq);
if ((dm_old_request_peeked_before_merge_deadline(md) &&
md_in_flight(md) && rq->bio && !bio_multiple_segments(rq->bio) &&
md->last_rq_pos == pos && md->last_rq_rw == rq_data_dir(rq)) ||
(ti->type->busy && ti->type->busy(ti))) {
blk_delay_queue(q, 10);
return;
}
dm_start_request(md, rq);
tio = tio_from_request(rq);
init_tio(tio, rq, md);
/* Establish tio->ti before queuing work (map_tio_request) */
tio->ti = ti;
kthread_queue_work(&md->kworker, &tio->work);
BUG_ON(!irqs_disabled());
}
}
/*
* Fully initialize a .request_fn request-based queue.
*/
int dm_old_init_request_queue(struct mapped_device *md, struct dm_table *t)
{
struct dm_target *immutable_tgt;
/* Fully initialize the queue */
md->queue->cmd_size = sizeof(struct dm_rq_target_io);
md->queue->rq_alloc_data = md;
md->queue->request_fn = dm_old_request_fn;
md->queue->init_rq_fn = dm_rq_init_rq;
immutable_tgt = dm_table_get_immutable_target(t);
if (immutable_tgt && immutable_tgt->per_io_data_size) {
/* any target-specific per-io data is immediately after the tio */
md->queue->cmd_size += immutable_tgt->per_io_data_size;
md->init_tio_pdu = true;
}
if (blk_init_allocated_queue(md->queue) < 0)
return -EINVAL;
/* disable dm_old_request_fn's merge heuristic by default */
md->seq_rq_merge_deadline_usecs = 0;
blk_queue_softirq_done(md->queue, dm_softirq_done);
/* Initialize the request-based DM worker thread */
kthread_init_worker(&md->kworker);
md->kworker_task = kthread_run(kthread_worker_fn, &md->kworker,
"kdmwork-%s", dm_device_name(md));
if (IS_ERR(md->kworker_task)) {
int error = PTR_ERR(md->kworker_task);
md->kworker_task = NULL;
return error;
}
return 0;
}
static int dm_mq_init_request(struct blk_mq_tag_set *set, struct request *rq,
unsigned int hctx_idx, unsigned int numa_node)
{
return __dm_rq_init_rq(set->driver_data, rq);
}
static blk_status_t dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
@ -790,11 +529,6 @@ int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t)
struct dm_target *immutable_tgt;
int err;
if (!dm_table_all_blk_mq_devices(t)) {
DMERR("request-based dm-mq may only be stacked on blk-mq device(s)");
return -EINVAL;
}
md->tag_set = kzalloc_node(sizeof(struct blk_mq_tag_set), GFP_KERNEL, md->numa_node_id);
if (!md->tag_set)
return -ENOMEM;
@ -845,6 +579,8 @@ void dm_mq_cleanup_mapped_device(struct mapped_device *md)
module_param(reserved_rq_based_ios, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(reserved_rq_based_ios, "Reserved IOs in request-based mempools");
/* Unused, but preserved for userspace compatibility */
static bool use_blk_mq = true;
module_param(use_blk_mq, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(use_blk_mq, "Use block multiqueue for request-based DM devices");

4
drivers/md/dm-rq.h
View File

@ -46,10 +46,6 @@ struct dm_rq_clone_bio_info {
struct bio clone;
};
bool dm_use_blk_mq_default(void);
bool dm_use_blk_mq(struct mapped_device *md);
int dm_old_init_request_queue(struct mapped_device *md, struct dm_table *t);
int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t);
void dm_mq_cleanup_mapped_device(struct mapped_device *md);

3
drivers/md/dm-sysfs.c
View File

@ -92,7 +92,8 @@ static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf)
static ssize_t dm_attr_use_blk_mq_show(struct mapped_device *md, char *buf)
{
sprintf(buf, "%d\n", dm_use_blk_mq(md));
/* Purely for userspace compatibility */
sprintf(buf, "%d\n", true);
return strlen(buf);
}

47
drivers/md/dm-table.c
View File

@ -47,7 +47,6 @@ struct dm_table {
bool integrity_supported:1;
bool singleton:1;
bool all_blk_mq:1;
unsigned integrity_added:1;
/*
@ -910,21 +909,10 @@ static bool dm_table_supports_dax(struct dm_table *t)
static bool dm_table_does_not_support_partial_completion(struct dm_table *t);
struct verify_rq_based_data {
unsigned sq_count;
unsigned mq_count;
};
static int device_is_rq_based(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);
struct verify_rq_based_data *v = data;
if (q->mq_ops)
v->mq_count++;
else
v->sq_count++;
return queue_is_rq_based(q);
}
@ -933,7 +921,6 @@ static int dm_table_determine_type(struct dm_table *t)
{
unsigned i;
unsigned bio_based = 0, request_based = 0, hybrid = 0;
struct verify_rq_based_data v = {.sq_count = 0, .mq_count = 0};
struct dm_target *tgt;
struct list_head *devices = dm_table_get_devices(t);
enum dm_queue_mode live_md_type = dm_get_md_type(t->md);
@ -1022,11 +1009,9 @@ verify_rq_based:
int srcu_idx;
struct dm_table *live_table = dm_get_live_table(t->md, &srcu_idx);
/* inherit live table's type and all_blk_mq */
if (live_table) {
/* inherit live table's type */
if (live_table)
t->type = live_table->type;
t->all_blk_mq = live_table->all_blk_mq;
}
dm_put_live_table(t->md, srcu_idx);
return 0;
}
@ -1042,21 +1027,10 @@ verify_rq_based:
/* Non-request-stackable devices can't be used for request-based dm */
if (!tgt->type->iterate_devices ||
!tgt->type->iterate_devices(tgt, device_is_rq_based, &v)) {
!tgt->type->iterate_devices(tgt, device_is_rq_based, NULL)) {
DMERR("table load rejected: including non-request-stackable devices");
return -EINVAL;
}
if (v.sq_count && v.mq_count) {
DMERR("table load rejected: not all devices are blk-mq request-stackable");
return -EINVAL;
}
t->all_blk_mq = v.mq_count > 0;
if (!t->all_blk_mq &&
(t->type == DM_TYPE_MQ_REQUEST_BASED || t->type == DM_TYPE_NVME_BIO_BASED)) {
DMERR("table load rejected: all devices are not blk-mq request-stackable");
return -EINVAL;
}
return 0;
}
@ -1105,11 +1079,6 @@ bool dm_table_request_based(struct dm_table *t)
return __table_type_request_based(dm_table_get_type(t));
}
bool dm_table_all_blk_mq_devices(struct dm_table *t)
{
return t->all_blk_mq;
}
static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *md)
{
enum dm_queue_mode type = dm_table_get_type(t);
@ -2083,22 +2052,14 @@ void dm_table_run_md_queue_async(struct dm_table *t)
{
struct mapped_device *md;
struct request_queue *queue;
unsigned long flags;
if (!dm_table_request_based(t))
return;
md = dm_table_get_md(t);
queue = dm_get_md_queue(md);
if (queue) {
if (queue->mq_ops)
if (queue)
blk_mq_run_hw_queues(queue, true);
else {
spin_lock_irqsave(queue->queue_lock, flags);
blk_run_queue_async(queue);
spin_unlock_irqrestore(queue->queue_lock, flags);
}
}
}
EXPORT_SYMBOL(dm_table_run_md_queue_async);

21
drivers/md/dm.c
View File

@ -1808,8 +1808,6 @@ static void dm_wq_work(struct work_struct *work);
static void dm_init_normal_md_queue(struct mapped_device *md)
{
md->use_blk_mq = false;
/*
* Initialize aspects of queue that aren't relevant for blk-mq
*/
@ -1820,8 +1818,6 @@ static void cleanup_mapped_device(struct mapped_device *md)
{
if (md->wq)
destroy_workqueue(md->wq);
if (md->kworker_task)
kthread_stop(md->kworker_task);
bioset_exit(&md->bs);
bioset_exit(&md->io_bs);
@ -1888,7 +1884,6 @@ static struct mapped_device *alloc_dev(int minor)
goto bad_io_barrier;
md->numa_node_id = numa_node_id;
md->use_blk_mq = dm_use_blk_mq_default();
md->init_tio_pdu = false;
md->type = DM_TYPE_NONE;
mutex_init(&md->suspend_lock);
@ -1919,7 +1914,6 @@ static struct mapped_device *alloc_dev(int minor)
INIT_WORK(&md->work, dm_wq_work);
init_waitqueue_head(&md->eventq);
init_completion(&md->kobj_holder.completion);
md->kworker_task = NULL;
md->disk->major = _major;
md->disk->first_minor = minor;
@ -2219,13 +2213,6 @@ int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
switch (type) {
case DM_TYPE_REQUEST_BASED:
dm_init_normal_md_queue(md);
r = dm_old_init_request_queue(md, t);
if (r) {
DMERR("Cannot initialize queue for request-based mapped device");
return r;
}
break;
case DM_TYPE_MQ_REQUEST_BASED:
r = dm_mq_init_request_queue(md, t);
if (r) {
@ -2331,9 +2318,6 @@ static void __dm_destroy(struct mapped_device *md, bool wait)
blk_set_queue_dying(md->queue);
if (dm_request_based(md) && md->kworker_task)
kthread_flush_worker(&md->kworker);
/*
* Take suspend_lock so that presuspend and postsuspend methods
* do not race with internal suspend.
@ -2586,11 +2570,8 @@ static int __dm_suspend(struct mapped_device *md, struct dm_table *map,
* Stop md->queue before flushing md->wq in case request-based
* dm defers requests to md->wq from md->queue.
*/
if (dm_request_based(md)) {
if (dm_request_based(md))
dm_stop_queue(md->queue);
if (md->kworker_task)
kthread_flush_worker(&md->kworker);
}
flush_workqueue(md->wq);

1
drivers/md/dm.h
View File

@ -70,7 +70,6 @@ struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
bool dm_table_bio_based(struct dm_table *t);
bool dm_table_request_based(struct dm_table *t);
bool dm_table_all_blk_mq_devices(struct dm_table *t);
void dm_table_free_md_mempools(struct dm_table *t);
struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);