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authorMike Snitzer <snitzer@redhat.com>2016-05-25 04:16:51 +0300
committerMike Snitzer <snitzer@redhat.com>2016-06-10 22:16:02 +0300
commite83068a5faafb8ca65d3b58bd1e1e3959ce1ddce (patch)
tree9158ec7acad94d7035153f84e8ff53205caf7315 /drivers/md/dm.h
parentbf661be1fcf9b1da8abc81a56ff41ce5964ce896 (diff)
downloadlinux-e83068a5faafb8ca65d3b58bd1e1e3959ce1ddce.tar.xz
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>
Diffstat (limited to 'drivers/md/dm.h')
-rw-r--r--drivers/md/dm.h10
1 files changed, 1 insertions, 9 deletions
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index b611b3064a7c..2e0e4a53a312 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -34,14 +34,6 @@
#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.
*/
struct dm_dev_internal {
@@ -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);