From: NeilBrown Add per-target unplug callback support. Cc: linux-raid@vger.kernel.org Signed-off-by: NeilBrown Signed-off-by: Jonathan Brassow Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon --- drivers/md/dm-raid.c | 10 ++++++++++ drivers/md/dm-table.c | 5 +++++ include/linux/device-mapper.h | 1 + 2 files changed, 6 insertions(+) Index: linux-2.6.37/drivers/md/dm-table.c =================================================================== --- linux-2.6.37.orig/drivers/md/dm-table.c +++ linux-2.6.37/drivers/md/dm-table.c @@ -1278,6 +1278,7 @@ void dm_table_unplug_all(struct dm_table { 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 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) Index: linux-2.6.37/include/linux/device-mapper.h =================================================================== --- linux-2.6.37.orig/include/linux/device-mapper.h +++ linux-2.6.37/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);