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authorNeilBrown <neilb@suse.de>2011-01-13 23:00:02 +0300
committerAlasdair G Kergon <agk@redhat.com>2011-01-13 23:00:02 +0300
commit99d03c141b40914b67d63c9d23b8da4386422ed7 (patch)
treed9c2d4da01f749325fac949d96e35aedea05cfc4
parent9d357b0787bb3c91835d5e658c3bda178f9ca419 (diff)
downloadlinux-99d03c141b40914b67d63c9d23b8da4386422ed7.tar.xz
dm: per target unplug callback support
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>
-rw-r--r--drivers/md/dm-table.c5
-rw-r--r--include/linux/device-mapper.h1
2 files changed, 6 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 7e2ec3c05550..dffa0ac7c4f0 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1278,6 +1278,7 @@ void dm_table_unplug_all(struct dm_table *t)
{
struct dm_dev_internal *dd;
struct list_head *devices = dm_table_get_devices(t);
+ struct dm_target_callbacks *cb;
list_for_each_entry(dd, devices, list) {
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),
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)
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 4b1c63d478ab..272496d1fae4 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -197,6 +197,7 @@ struct dm_target {
struct dm_target_callbacks {
struct list_head list;
int (*congested_fn) (struct dm_target_callbacks *, int);
+ void (*unplug_fn)(struct dm_target_callbacks *);
};
int dm_register_target(struct target_type *t);