aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/md/dm-stripe.c
diff options
context:
space:
mode:
authorMike Snitzer <snitzer@redhat.com>2009-09-04 15:40:25 -0400
committerAlasdair G Kergon <agk@redhat.com>2009-09-04 15:40:25 -0400
commit40bea431274c247425e7f5970d796ff7b37a2b22 (patch)
treecc9791861c01605d2dca28d3eac9182c301a832c /drivers/md/dm-stripe.c
parenta963a956225eb0f8c4d3537f428153c30adf54b8 (diff)
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 'drivers/md/dm-stripe.c')
-rw-r--r--drivers/md/dm-stripe.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 4e0e5937e42a..3e563d251733 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -329,9 +329,19 @@ static int stripe_iterate_devices(struct dm_target *ti,
329 return ret; 329 return ret;
330} 330}
331 331
332static void stripe_io_hints(struct dm_target *ti,
333 struct queue_limits *limits)
334{
335 struct stripe_c *sc = ti->private;
336 unsigned chunk_size = (sc->chunk_mask + 1) << 9;
337
338 blk_limits_io_min(limits, chunk_size);
339 limits->io_opt = chunk_size * sc->stripes;
340}
341
332static struct target_type stripe_target = { 342static struct target_type stripe_target = {
333 .name = "striped", 343 .name = "striped",
334 .version = {1, 2, 0}, 344 .version = {1, 3, 0},
335 .module = THIS_MODULE, 345 .module = THIS_MODULE,
336 .ctr = stripe_ctr, 346 .ctr = stripe_ctr,
337 .dtr = stripe_dtr, 347 .dtr = stripe_dtr,
@@ -339,6 +349,7 @@ static struct target_type stripe_target = {
339 .end_io = stripe_end_io, 349 .end_io = stripe_end_io,
340 .status = stripe_status, 350 .status = stripe_status,
341 .iterate_devices = stripe_iterate_devices, 351 .iterate_devices = stripe_iterate_devices,
352 .io_hints = stripe_io_hints,
342}; 353};
343 354
344int __init dm_stripe_init(void) 355int __init dm_stripe_init(void)