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dm: introduce DM_TYPE_NVME_BIO_BASED

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If dm_table_determine_type() establishes DM_TYPE_NVME_BIO_BASED then
all devices in the DM table do not support partial completions.  Also,
the table has a single immutable target that doesn't require DM core to
split bios.

This will enable adding NVMe optimizations to bio-based DM.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2017-12-04 21:07:37 -05:00
parent f3986374f9
commit 22c11858e8
3 changed files with 51 additions and 6 deletions
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1
include/linux/device-mapper.h
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@ -28,6 +28,7 @@ enum dm_queue_mode {
DM_TYPE_REQUEST_BASED = 2,
DM_TYPE_MQ_REQUEST_BASED = 3,
DM_TYPE_DAX_BIO_BASED = 4,
DM_TYPE_NVME_BIO_BASED = 5,
};
typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;