forked from Minki/linux
dm mpath: add optional "queue_mode" feature
Allow a user to specify an optional feature 'queue_mode <mode>' where <mode> may be "bio", "rq" or "mq" -- which corresponds to bio-based, request_fn rq-based, and blk-mq rq-based respectively. If the queue_mode feature isn't specified the default for the "multipath" target is still "rq" but if dm_mod.use_blk_mq is set to Y it'll default to mode "mq". This new queue_mode feature introduces the ability for each multipath device to have its own queue_mode (whereas before this feature all multipath devices effectively had to have the same queue_mode). This commit also goes a long way to eliminate the awkward (ab)use of DM_TYPE_*, the associated filter_md_type() and other relatively fragile and difficult to maintain code. Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer
parent
bf661be1fc
commit
e83068a5fa
@ -90,6 +90,8 @@ struct multipath {
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atomic_t pg_init_in_progress; /* Only one pg_init allowed at once */
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atomic_t pg_init_count; /* Number of times pg_init called */
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unsigned queue_mode;
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/*
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* We must use a mempool of dm_mpath_io structs so that we
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* can resubmit bios on error.
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@ -131,7 +133,6 @@ static void process_queued_bios(struct work_struct *work);
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#define MPATHF_PG_INIT_DISABLED 4 /* pg_init is not currently allowed */
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#define MPATHF_PG_INIT_REQUIRED 5 /* pg_init needs calling? */
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#define MPATHF_PG_INIT_DELAY_RETRY 6 /* Delay pg_init retry? */
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#define MPATHF_BIO_BASED 7 /* Device is bio-based? */
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/*-----------------------------------------------
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* Allocation routines
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@ -191,8 +192,7 @@ static void free_priority_group(struct priority_group *pg,
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kfree(pg);
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}
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static struct multipath *alloc_multipath(struct dm_target *ti, bool use_blk_mq,
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bool bio_based)
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static struct multipath *alloc_multipath(struct dm_target *ti)
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{
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struct multipath *m;
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@ -210,25 +210,7 @@ static struct multipath *alloc_multipath(struct dm_target *ti, bool use_blk_mq,
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mutex_init(&m->work_mutex);
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m->mpio_pool = NULL;
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if (!use_blk_mq && !bio_based) {
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unsigned min_ios = dm_get_reserved_rq_based_ios();
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m->mpio_pool = mempool_create_slab_pool(min_ios, _mpio_cache);
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if (!m->mpio_pool) {
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kfree(m);
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return NULL;
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}
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}
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if (bio_based) {
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INIT_WORK(&m->process_queued_bios, process_queued_bios);
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set_bit(MPATHF_BIO_BASED, &m->flags);
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/*
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* bio-based doesn't support any direct scsi_dh management;
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* it just discovers if a scsi_dh is attached.
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*/
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set_bit(MPATHF_RETAIN_ATTACHED_HW_HANDLER, &m->flags);
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}
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m->queue_mode = DM_TYPE_NONE;
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m->ti = ti;
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ti->private = m;
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@ -237,6 +219,39 @@ static struct multipath *alloc_multipath(struct dm_target *ti, bool use_blk_mq,
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return m;
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}
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static int alloc_multipath_stage2(struct dm_target *ti, struct multipath *m)
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{
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if (m->queue_mode == DM_TYPE_NONE) {
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/*
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* Default to request-based.
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*/
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if (dm_use_blk_mq(dm_table_get_md(ti->table)))
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m->queue_mode = DM_TYPE_MQ_REQUEST_BASED;
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else
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m->queue_mode = DM_TYPE_REQUEST_BASED;
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}
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if (m->queue_mode == DM_TYPE_REQUEST_BASED) {
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unsigned min_ios = dm_get_reserved_rq_based_ios();
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m->mpio_pool = mempool_create_slab_pool(min_ios, _mpio_cache);
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if (!m->mpio_pool)
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return -ENOMEM;
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}
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else if (m->queue_mode == DM_TYPE_BIO_BASED) {
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INIT_WORK(&m->process_queued_bios, process_queued_bios);
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/*
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* bio-based doesn't support any direct scsi_dh management;
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* it just discovers if a scsi_dh is attached.
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*/
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set_bit(MPATHF_RETAIN_ATTACHED_HW_HANDLER, &m->flags);
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}
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dm_table_set_type(ti->table, m->queue_mode);
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return 0;
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}
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static void free_multipath(struct multipath *m)
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{
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struct priority_group *pg, *tmp;
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@ -653,7 +668,7 @@ static int multipath_map_bio(struct dm_target *ti, struct bio *bio)
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static void process_queued_bios_list(struct multipath *m)
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{
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if (test_bit(MPATHF_BIO_BASED, &m->flags))
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if (m->queue_mode == DM_TYPE_BIO_BASED)
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queue_work(kmultipathd, &m->process_queued_bios);
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}
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@ -964,7 +979,7 @@ static int parse_hw_handler(struct dm_arg_set *as, struct multipath *m)
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if (!hw_argc)
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return 0;
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if (test_bit(MPATHF_BIO_BASED, &m->flags)) {
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if (m->queue_mode == DM_TYPE_BIO_BASED) {
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dm_consume_args(as, hw_argc);
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DMERR("bio-based multipath doesn't allow hardware handler args");
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return 0;
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@ -1005,7 +1020,7 @@ static int parse_features(struct dm_arg_set *as, struct multipath *m)
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const char *arg_name;
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static struct dm_arg _args[] = {
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{0, 6, "invalid number of feature args"},
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{0, 8, "invalid number of feature args"},
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{1, 50, "pg_init_retries must be between 1 and 50"},
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{0, 60000, "pg_init_delay_msecs must be between 0 and 60000"},
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};
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@ -1045,6 +1060,24 @@ static int parse_features(struct dm_arg_set *as, struct multipath *m)
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continue;
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}
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if (!strcasecmp(arg_name, "queue_mode") &&
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(argc >= 1)) {
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const char *queue_mode_name = dm_shift_arg(as);
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if (!strcasecmp(queue_mode_name, "bio"))
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m->queue_mode = DM_TYPE_BIO_BASED;
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else if (!strcasecmp(queue_mode_name, "rq"))
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m->queue_mode = DM_TYPE_REQUEST_BASED;
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else if (!strcasecmp(queue_mode_name, "mq"))
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m->queue_mode = DM_TYPE_MQ_REQUEST_BASED;
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else {
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ti->error = "Unknown 'queue_mode' requested";
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r = -EINVAL;
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}
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argc--;
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continue;
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}
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ti->error = "Unrecognised multipath feature request";
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r = -EINVAL;
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} while (argc && !r);
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@ -1052,8 +1085,7 @@ static int parse_features(struct dm_arg_set *as, struct multipath *m)
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return r;
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}
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static int __multipath_ctr(struct dm_target *ti, unsigned int argc,
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char **argv, bool bio_based)
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static int multipath_ctr(struct dm_target *ti, unsigned argc, char **argv)
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{
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/* target arguments */
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static struct dm_arg _args[] = {
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@ -1066,12 +1098,11 @@ static int __multipath_ctr(struct dm_target *ti, unsigned int argc,
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struct dm_arg_set as;
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unsigned pg_count = 0;
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unsigned next_pg_num;
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bool use_blk_mq = dm_use_blk_mq(dm_table_get_md(ti->table));
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as.argc = argc;
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as.argv = argv;
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m = alloc_multipath(ti, use_blk_mq, bio_based);
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m = alloc_multipath(ti);
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if (!m) {
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ti->error = "can't allocate multipath";
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return -EINVAL;
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@ -1081,6 +1112,10 @@ static int __multipath_ctr(struct dm_target *ti, unsigned int argc,
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if (r)
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goto bad;
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r = alloc_multipath_stage2(ti, m);
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if (r)
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goto bad;
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r = parse_hw_handler(&as, m);
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if (r)
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goto bad;
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@ -1130,9 +1165,9 @@ static int __multipath_ctr(struct dm_target *ti, unsigned int argc,
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ti->num_flush_bios = 1;
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ti->num_discard_bios = 1;
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ti->num_write_same_bios = 1;
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if (bio_based)
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if (m->queue_mode == DM_TYPE_BIO_BASED)
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ti->per_io_data_size = multipath_per_bio_data_size();
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else if (use_blk_mq)
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else if (m->queue_mode == DM_TYPE_MQ_REQUEST_BASED)
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ti->per_io_data_size = sizeof(struct dm_mpath_io);
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return 0;
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@ -1142,16 +1177,6 @@ static int __multipath_ctr(struct dm_target *ti, unsigned int argc,
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return r;
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}
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static int multipath_ctr(struct dm_target *ti, unsigned argc, char **argv)
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{
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return __multipath_ctr(ti, argc, argv, false);
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}
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static int multipath_bio_ctr(struct dm_target *ti, unsigned argc, char **argv)
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{
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return __multipath_ctr(ti, argc, argv, true);
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}
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static void multipath_wait_for_pg_init_completion(struct multipath *m)
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{
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DECLARE_WAITQUEUE(wait, current);
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@ -1700,7 +1725,9 @@ static void multipath_status(struct dm_target *ti, status_type_t type,
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DMEMIT("%u ", test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags) +
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(m->pg_init_retries > 0) * 2 +
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(m->pg_init_delay_msecs != DM_PG_INIT_DELAY_DEFAULT) * 2 +
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test_bit(MPATHF_RETAIN_ATTACHED_HW_HANDLER, &m->flags));
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test_bit(MPATHF_RETAIN_ATTACHED_HW_HANDLER, &m->flags) +
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(m->queue_mode != DM_TYPE_REQUEST_BASED) * 2);
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if (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags))
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DMEMIT("queue_if_no_path ");
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if (m->pg_init_retries)
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@ -1709,6 +1736,16 @@ static void multipath_status(struct dm_target *ti, status_type_t type,
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DMEMIT("pg_init_delay_msecs %u ", m->pg_init_delay_msecs);
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if (test_bit(MPATHF_RETAIN_ATTACHED_HW_HANDLER, &m->flags))
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DMEMIT("retain_attached_hw_handler ");
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if (m->queue_mode != DM_TYPE_REQUEST_BASED) {
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switch(m->queue_mode) {
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case DM_TYPE_BIO_BASED:
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DMEMIT("queue_mode bio ");
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break;
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case DM_TYPE_MQ_REQUEST_BASED:
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DMEMIT("queue_mode mq ");
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break;
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}
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}
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}
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if (!m->hw_handler_name || type == STATUSTYPE_INFO)
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@ -1995,7 +2032,7 @@ static int multipath_busy(struct dm_target *ti)
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*---------------------------------------------------------------*/
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static struct target_type multipath_target = {
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.name = "multipath",
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.version = {1, 11, 0},
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.version = {1, 12, 0},
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.features = DM_TARGET_SINGLETON | DM_TARGET_IMMUTABLE,
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.module = THIS_MODULE,
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.ctr = multipath_ctr,
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@ -2004,22 +2041,6 @@ static struct target_type multipath_target = {
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.clone_and_map_rq = multipath_clone_and_map,
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.release_clone_rq = multipath_release_clone,
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.rq_end_io = multipath_end_io,
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.presuspend = multipath_presuspend,
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.postsuspend = multipath_postsuspend,
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.resume = multipath_resume,
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.status = multipath_status,
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.message = multipath_message,
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.prepare_ioctl = multipath_prepare_ioctl,
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.iterate_devices = multipath_iterate_devices,
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.busy = multipath_busy,
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};
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static struct target_type multipath_bio_target = {
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.name = "multipath-bio",
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.version = {1, 0, 0},
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.module = THIS_MODULE,
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.ctr = multipath_bio_ctr,
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.dtr = multipath_dtr,
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.map = multipath_map_bio,
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.end_io = multipath_end_io_bio,
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.presuspend = multipath_presuspend,
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@ -2048,13 +2069,6 @@ static int __init dm_multipath_init(void)
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goto bad_register_target;
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}
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r = dm_register_target(&multipath_bio_target);
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if (r < 0) {
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DMERR("bio-based register failed %d", r);
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r = -EINVAL;
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goto bad_register_bio_based_target;
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}
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kmultipathd = alloc_workqueue("kmpathd", WQ_MEM_RECLAIM, 0);
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if (!kmultipathd) {
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DMERR("failed to create workqueue kmpathd");
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@ -2081,8 +2095,6 @@ static int __init dm_multipath_init(void)
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bad_alloc_kmpath_handlerd:
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destroy_workqueue(kmultipathd);
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bad_alloc_kmultipathd:
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dm_unregister_target(&multipath_bio_target);
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bad_register_bio_based_target:
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dm_unregister_target(&multipath_target);
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bad_register_target:
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kmem_cache_destroy(_mpio_cache);
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@ -2096,7 +2108,6 @@ static void __exit dm_multipath_exit(void)
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destroy_workqueue(kmultipathd);
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dm_unregister_target(&multipath_target);
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dm_unregister_target(&multipath_bio_target);
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kmem_cache_destroy(_mpio_cache);
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}
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@ -230,7 +230,14 @@ static void free_rq_clone(struct request *clone)
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blk_rq_unprep_clone(clone);
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if (md->type == DM_TYPE_MQ_REQUEST_BASED)
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/*
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* It is possible for a clone_old_rq() allocated clone to
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* get passed in -- it may not yet have a request_queue.
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* This is known to occur if the error target replaces
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* a multipath target that has a request_fn queue stacked
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* on blk-mq queue(s).
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*/
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if (clone->q && clone->q->mq_ops)
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/* stacked on blk-mq queue(s) */
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tio->ti->type->release_clone_rq(clone);
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else if (!md->queue->mq_ops)
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@ -561,7 +568,7 @@ static struct dm_rq_target_io *dm_old_prep_tio(struct request *rq,
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* Must clone a request if this .request_fn DM device
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* is stacked on .request_fn device(s).
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*/
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if (!dm_table_mq_request_based(table)) {
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if (!dm_table_all_blk_mq_devices(table)) {
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if (!clone_old_rq(rq, md, tio, gfp_mask)) {
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dm_put_live_table(md, srcu_idx);
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free_old_rq_tio(tio);
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@ -711,7 +718,7 @@ ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
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{
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unsigned deadline;
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if (!dm_request_based(md) || md->use_blk_mq)
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if (dm_get_md_type(md) != DM_TYPE_REQUEST_BASED)
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return count;
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if (kstrtouint(buf, 10, &deadline))
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@ -886,12 +893,13 @@ static struct blk_mq_ops dm_mq_ops = {
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.init_request = dm_mq_init_request,
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};
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int dm_mq_init_request_queue(struct mapped_device *md, struct dm_target *immutable_tgt)
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int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t)
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{
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struct request_queue *q;
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struct dm_target *immutable_tgt;
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int err;
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if (dm_get_md_type(md) == DM_TYPE_REQUEST_BASED) {
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if (!dm_table_all_blk_mq_devices(t)) {
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DMERR("request-based dm-mq may only be stacked on blk-mq device(s)");
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return -EINVAL;
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}
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@ -908,6 +916,7 @@ int dm_mq_init_request_queue(struct mapped_device *md, struct dm_target *immutab
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md->tag_set->driver_data = md;
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md->tag_set->cmd_size = sizeof(struct dm_rq_target_io);
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immutable_tgt = dm_table_get_immutable_target(t);
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if (immutable_tgt && immutable_tgt->per_io_data_size) {
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/* any target-specific per-io data is immediately after the tio */
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md->tag_set->cmd_size += immutable_tgt->per_io_data_size;
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@ -49,7 +49,7 @@ bool dm_use_blk_mq_default(void);
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bool dm_use_blk_mq(struct mapped_device *md);
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int dm_old_init_request_queue(struct mapped_device *md);
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int dm_mq_init_request_queue(struct mapped_device *md, struct dm_target *immutable_tgt);
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int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t);
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void dm_mq_cleanup_mapped_device(struct mapped_device *md);
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void dm_start_queue(struct request_queue *q);
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@ -43,8 +43,10 @@ struct dm_table {
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struct dm_target *targets;
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struct target_type *immutable_target_type;
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unsigned integrity_supported:1;
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unsigned singleton:1;
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bool integrity_supported:1;
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bool singleton:1;
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bool all_blk_mq:1;
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/*
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* Indicates the rw permissions for the new logical
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@ -206,6 +208,7 @@ int dm_table_create(struct dm_table **result, fmode_t mode,
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return -ENOMEM;
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}
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t->type = DM_TYPE_NONE;
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t->mode = mode;
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t->md = md;
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*result = t;
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@ -703,7 +706,7 @@ int dm_table_add_target(struct dm_table *t, const char *type,
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dm_device_name(t->md), type);
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return -EINVAL;
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}
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t->singleton = 1;
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t->singleton = true;
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}
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if (dm_target_always_writeable(tgt->type) && !(t->mode & FMODE_WRITE)) {
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@ -830,16 +833,29 @@ static bool __table_type_request_based(unsigned table_type)
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table_type == DM_TYPE_MQ_REQUEST_BASED);
|
||||
}
|
||||
|
||||
static int dm_table_set_type(struct dm_table *t)
|
||||
void dm_table_set_type(struct dm_table *t, unsigned type)
|
||||
{
|
||||
t->type = type;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(dm_table_set_type);
|
||||
|
||||
static int dm_table_determine_type(struct dm_table *t)
|
||||
{
|
||||
unsigned i;
|
||||
unsigned bio_based = 0, request_based = 0, hybrid = 0;
|
||||
bool use_blk_mq = false;
|
||||
bool verify_blk_mq = false;
|
||||
struct dm_target *tgt;
|
||||
struct dm_dev_internal *dd;
|
||||
struct list_head *devices;
|
||||
struct list_head *devices = dm_table_get_devices(t);
|
||||
unsigned live_md_type = dm_get_md_type(t->md);
|
||||
|
||||
if (t->type != DM_TYPE_NONE) {
|
||||
/* target already set the table's type */
|
||||
if (t->type == DM_TYPE_BIO_BASED)
|
||||
return 0;
|
||||
goto verify_rq_based;
|
||||
}
|
||||
|
||||
for (i = 0; i < t->num_targets; i++) {
|
||||
tgt = t->targets + i;
|
||||
if (dm_target_hybrid(tgt))
|
||||
@ -876,6 +892,19 @@ static int dm_table_set_type(struct dm_table *t)
|
||||
|
||||
BUG_ON(!request_based); /* No targets in this table */
|
||||
|
||||
if (list_empty(devices) && __table_type_request_based(live_md_type)) {
|
||||
/* inherit live MD type */
|
||||
t->type = live_md_type;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* The only way to establish DM_TYPE_MQ_REQUEST_BASED is by
|
||||
* having a compatible target use dm_table_set_type.
|
||||
*/
|
||||
t->type = DM_TYPE_REQUEST_BASED;
|
||||
|
||||
verify_rq_based:
|
||||
/*
|
||||
* Request-based dm supports only tables that have a single target now.
|
||||
* To support multiple targets, request splitting support is needed,
|
||||
@ -888,7 +917,6 @@ static int dm_table_set_type(struct dm_table *t)
|
||||
}
|
||||
|
||||
/* Non-request-stackable devices can't be used for request-based dm */
|
||||
devices = dm_table_get_devices(t);
|
||||
list_for_each_entry(dd, devices, list) {
|
||||
struct request_queue *q = bdev_get_queue(dd->dm_dev->bdev);
|
||||
|
||||
@ -899,10 +927,10 @@ static int dm_table_set_type(struct dm_table *t)
|
||||
}
|
||||
|
||||
if (q->mq_ops)
|
||||
use_blk_mq = true;
|
||||
verify_blk_mq = true;
|
||||
}
|
||||
|
||||
if (use_blk_mq) {
|
||||
if (verify_blk_mq) {
|
||||
/* verify _all_ devices in the table are blk-mq devices */
|
||||
list_for_each_entry(dd, devices, list)
|
||||
if (!bdev_get_queue(dd->dm_dev->bdev)->mq_ops) {
|
||||
@ -910,14 +938,9 @@ static int dm_table_set_type(struct dm_table *t)
|
||||
" are blk-mq request-stackable");
|
||||
return -EINVAL;
|
||||
}
|
||||
t->type = DM_TYPE_MQ_REQUEST_BASED;
|
||||
|
||||
} else if (list_empty(devices) && __table_type_request_based(live_md_type)) {
|
||||
/* inherit live MD type */
|
||||
t->type = live_md_type;
|
||||
|
||||
} else
|
||||
t->type = DM_TYPE_REQUEST_BASED;
|
||||
t->all_blk_mq = true;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -961,9 +984,9 @@ bool dm_table_request_based(struct dm_table *t)
|
||||
return __table_type_request_based(dm_table_get_type(t));
|
||||
}
|
||||
|
||||
bool dm_table_mq_request_based(struct dm_table *t)
|
||||
bool dm_table_all_blk_mq_devices(struct dm_table *t)
|
||||
{
|
||||
return dm_table_get_type(t) == DM_TYPE_MQ_REQUEST_BASED;
|
||||
return t->all_blk_mq;
|
||||
}
|
||||
|
||||
static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *md)
|
||||
@ -1106,7 +1129,7 @@ static int dm_table_register_integrity(struct dm_table *t)
|
||||
return 0;
|
||||
|
||||
if (!integrity_profile_exists(dm_disk(md))) {
|
||||
t->integrity_supported = 1;
|
||||
t->integrity_supported = true;
|
||||
/*
|
||||
* Register integrity profile during table load; we can do
|
||||
* this because the final profile must match during resume.
|
||||
@ -1129,7 +1152,7 @@ static int dm_table_register_integrity(struct dm_table *t)
|
||||
}
|
||||
|
||||
/* Preserve existing integrity profile */
|
||||
t->integrity_supported = 1;
|
||||
t->integrity_supported = true;
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -1141,9 +1164,9 @@ int dm_table_complete(struct dm_table *t)
|
||||
{
|
||||
int r;
|
||||
|
||||
r = dm_table_set_type(t);
|
||||
r = dm_table_determine_type(t);
|
||||
if (r) {
|
||||
DMERR("unable to set table type");
|
||||
DMERR("unable to determine table type");
|
||||
return r;
|
||||
}
|
||||
|
||||
|
||||
@ -1738,23 +1738,14 @@ struct queue_limits *dm_get_queue_limits(struct mapped_device *md)
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(dm_get_queue_limits);
|
||||
|
||||
static unsigned filter_md_type(unsigned type, struct mapped_device *md)
|
||||
{
|
||||
if (type == DM_TYPE_BIO_BASED)
|
||||
return type;
|
||||
|
||||
return !md->use_blk_mq ? DM_TYPE_REQUEST_BASED : DM_TYPE_MQ_REQUEST_BASED;
|
||||
}
|
||||
|
||||
/*
|
||||
* Setup the DM device's queue based on md's type
|
||||
*/
|
||||
int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
|
||||
{
|
||||
int r;
|
||||
unsigned md_type = filter_md_type(dm_get_md_type(md), md);
|
||||
|
||||
switch (md_type) {
|
||||
switch (dm_get_md_type(md)) {
|
||||
case DM_TYPE_REQUEST_BASED:
|
||||
r = dm_old_init_request_queue(md);
|
||||
if (r) {
|
||||
@ -1763,7 +1754,7 @@ int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
|
||||
}
|
||||
break;
|
||||
case DM_TYPE_MQ_REQUEST_BASED:
|
||||
r = dm_mq_init_request_queue(md, dm_table_get_immutable_target(t));
|
||||
r = dm_mq_init_request_queue(md, t);
|
||||
if (r) {
|
||||
DMERR("Cannot initialize queue for request-based dm-mq mapped device");
|
||||
return r;
|
||||
@ -2472,8 +2463,6 @@ struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, unsigned t
|
||||
if (!pools)
|
||||
return NULL;
|
||||
|
||||
type = filter_md_type(type, md);
|
||||
|
||||
switch (type) {
|
||||
case DM_TYPE_BIO_BASED:
|
||||
cachep = _io_cache;
|
||||
|
||||
@ -33,14 +33,6 @@
|
||||
*/
|
||||
#define DM_STATUS_NOFLUSH_FLAG (1 << 0)
|
||||
|
||||
/*
|
||||
* Type of table and mapped_device's mempool
|
||||
*/
|
||||
#define DM_TYPE_NONE 0
|
||||
#define DM_TYPE_BIO_BASED 1
|
||||
#define DM_TYPE_REQUEST_BASED 2
|
||||
#define DM_TYPE_MQ_REQUEST_BASED 3
|
||||
|
||||
/*
|
||||
* List of devices that a metadevice uses and should open/close.
|
||||
*/
|
||||
@ -77,7 +69,7 @@ struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
|
||||
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_request_based(struct dm_table *t);
|
||||
bool dm_table_mq_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);
|
||||
|
||||
|
||||
@ -19,6 +19,14 @@ struct dm_table;
|
||||
struct mapped_device;
|
||||
struct bio_vec;
|
||||
|
||||
/*
|
||||
* Type of table, mapped_device's mempool and request_queue
|
||||
*/
|
||||
#define DM_TYPE_NONE 0
|
||||
#define DM_TYPE_BIO_BASED 1
|
||||
#define DM_TYPE_REQUEST_BASED 2
|
||||
#define DM_TYPE_MQ_REQUEST_BASED 3
|
||||
|
||||
typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;
|
||||
|
||||
union map_info {
|
||||
@ -443,6 +451,14 @@ int dm_table_add_target(struct dm_table *t, const char *type,
|
||||
*/
|
||||
void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callbacks *cb);
|
||||
|
||||
/*
|
||||
* Target can use this to set the table's type.
|
||||
* Can only ever be called from a target's ctr.
|
||||
* Useful for "hybrid" target (supports both bio-based
|
||||
* and request-based).
|
||||
*/
|
||||
void dm_table_set_type(struct dm_table *t, unsigned type);
|
||||
|
||||
/*
|
||||
* Finally call this to make the table ready for use.
|
||||
*/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user