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authorMike Snitzer <snitzer@redhat.com>2015-03-11 15:01:09 -0400
committerMike Snitzer <snitzer@redhat.com>2015-04-15 12:10:17 -0400
commit17e149b8f73ba116e71e25930dd6f2eb3828792d (patch)
tree6407112dbb113ffeebfd0620df27d4f67cd27ed1 /drivers/md/dm.h
parent022333427a8aa4ccb318a9db90cea4e69ca1826b (diff)
downloadop-kernel-dev-17e149b8f73ba116e71e25930dd6f2eb3828792d.zip
op-kernel-dev-17e149b8f73ba116e71e25930dd6f2eb3828792d.tar.gz
dm: add 'use_blk_mq' module param and expose in per-device ro sysfs attr
Request-based DM's blk-mq support defaults to off; but a user can easily change the default using the dm_mod.use_blk_mq module/boot option. Also, you can check what mode a given request-based DM device is using with: cat /sys/block/dm-X/dm/use_blk_mq This change enabled further cleanup and reduced work (e.g. the md->io_pool and md->rq_pool isn't created if using blk-mq). Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm.h')
-rw-r--r--drivers/md/dm.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 5522422..6123c2b 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -211,6 +211,8 @@ int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
void dm_internal_suspend(struct mapped_device *md);
void dm_internal_resume(struct mapped_device *md);
+bool dm_use_blk_mq(struct mapped_device *md);
+
int dm_io_init(void);
void dm_io_exit(void);
@@ -220,7 +222,8 @@ void dm_kcopyd_exit(void);
/*
* Mempool operations
*/
-struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity, unsigned per_bio_data_size);
+struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, unsigned type,
+ unsigned integrity, unsigned per_bio_data_size);
void dm_free_md_mempools(struct dm_md_mempools *pools);
/*
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