Hi Alasdair,
Current dm-mpath target may not be quiet even after suspend completes
because some workqueues (e.g. device_handler's work, event handling)
are not flushed during the suspend sequence, although suspended
devices/targets should be quiet.
This patch lets dm-mpath be quiet during the suspend sequence by
flushing workqueues in postsuspend function.
Note: Even with this patch, multipath_message ioctl can kick such works
for already-suspended devices/targets.
Other patches are needed for it.
Signed-off-by: Kiyoshi Ueda <k-ueda@xxxxxxxxxxxxx>
Signed-off-by: Jun'ichi Nomura <j-nomura@xxxxxxxxxxxxx>
Cc: Alasdair G Kergon <agk@xxxxxxxxxx>
---
drivers/md/dm-mpath.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
Index: 2.6.32-rc6/drivers/md/dm-mpath.c
===================================================================
--- 2.6.32-rc6.orig/drivers/md/dm-mpath.c
+++ 2.6.32-rc6/drivers/md/dm-mpath.c
@@ -885,13 +885,18 @@ static int multipath_ctr(struct dm_targe
return r;
}
-static void multipath_dtr(struct dm_target *ti)
+static void flush_multipath_work(void)
{
- struct multipath *m = (struct multipath *) ti->private;
-
flush_workqueue(kmpath_handlerd);
flush_workqueue(kmultipathd);
flush_scheduled_work();
+}
+
+static void multipath_dtr(struct dm_target *ti)
+{
+ struct multipath *m = ti->private;
+
+ flush_multipath_work();
free_multipath(m);
}
@@ -1261,6 +1266,11 @@ static void multipath_presuspend(struct
queue_if_no_path(m, 0, 1);
}
+static void multipath_postsuspend(struct dm_target *ti)
+{
+ flush_multipath_work();
+}
+
/*
* Restore the queue_if_no_path setting.
*/
@@ -1567,13 +1577,14 @@ out:
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
- .version = {1, 1, 0},
+ .version = {1, 1, 1},
.module = THIS_MODULE,
.ctr = multipath_ctr,
.dtr = multipath_dtr,
.map_rq = multipath_map,
.rq_end_io = multipath_end_io,
.presuspend = multipath_presuspend,
+ .postsuspend = multipath_postsuspend,
.resume = multipath_resume,
.status = multipath_status,
.message = multipath_message,
--
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