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| author | Mike Snitzer <snitzer@redhat.com> | 2009-09-04 20:40:25 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-09-04 20:40:25 +0100 |
| commit | 40bea431274c247425e7f5970d796ff7b37a2b22 (patch) | |
| tree | cc9791861c01605d2dca28d3eac9182c301a832c /include/linux/device-mapper.h | |
| parent | a963a956225eb0f8c4d3537f428153c30adf54b8 (diff) | |
| download | blackbird-op-linux-40bea431274c247425e7f5970d796ff7b37a2b22.tar.gz blackbird-op-linux-40bea431274c247425e7f5970d796ff7b37a2b22.zip | |
dm stripe: expose correct io hints
Set sensible I/O hints for striped DM devices in the topology
infrastructure added for 2.6.31 for userspace tools to
obtain via sysfs.
Add .io_hints to 'struct target_type' to allow the I/O hints portion
(io_min and io_opt) of the 'struct queue_limits' to be set by each
target and implement this for dm-stripe.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'include/linux/device-mapper.h')
| -rw-r--r-- | include/linux/device-mapper.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 655e7721580a..df7607e6dce8 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -91,6 +91,9 @@ typedef int (*dm_iterate_devices_fn) (struct dm_target *ti, iterate_devices_callout_fn fn, void *data); +typedef void (*dm_io_hints_fn) (struct dm_target *ti, + struct queue_limits *limits); + /* * Returns: * 0: The target can handle the next I/O immediately. @@ -151,6 +154,7 @@ struct target_type { dm_merge_fn merge; dm_busy_fn busy; dm_iterate_devices_fn iterate_devices; + dm_io_hints_fn io_hints; /* For internal device-mapper use. */ struct list_head list; |
