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dm: per target unplug callback support

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Add per-target unplug callback support.

Cc: linux-raid@vger.kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
NeilBrown 2011-01-13 20:00:02 +00:00 committed by Alasdair G Kergon
parent 9d357b0787
commit 99d03c141b
2 changed files with 6 additions and 0 deletions
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5
drivers/md/dm-table.c
View File

@ -1278,6 +1278,7 @@ void dm_table_unplug_all(struct dm_table *t)
{ {
struct dm_dev_internal *dd; struct dm_dev_internal *dd;
struct list_head *devices = dm_table_get_devices(t); struct list_head *devices = dm_table_get_devices(t);
struct dm_target_callbacks *cb;
list_for_each_entry(dd, devices, list) { list_for_each_entry(dd, devices, list) {
struct request_queue *q = bdev_get_queue(dd->dm_dev.bdev); struct request_queue *q = bdev_get_queue(dd->dm_dev.bdev);
@ -1290,6 +1291,10 @@ void dm_table_unplug_all(struct dm_table *t)
dm_device_name(t->md), dm_device_name(t->md),
bdevname(dd->dm_dev.bdev, b)); bdevname(dd->dm_dev.bdev, b));
} }
list_for_each_entry(cb, &t->target_callbacks, list)
if (cb->unplug_fn)
cb->unplug_fn(cb);
} }
struct mapped_device *dm_table_get_md(struct dm_table *t) struct mapped_device *dm_table_get_md(struct dm_table *t)

1
include/linux/device-mapper.h
View File

@ -197,6 +197,7 @@ struct dm_target {
struct dm_target_callbacks { struct dm_target_callbacks {
struct list_head list; struct list_head list;
int (*congested_fn) (struct dm_target_callbacks *, int); int (*congested_fn) (struct dm_target_callbacks *, int);
void (*unplug_fn)(struct dm_target_callbacks *);
}; };
int dm_register_target(struct target_type *t); int dm_register_target(struct target_type *t);