The patch titled
md: fix a plug/unplug race in raid5
has been removed from the -mm tree. Its filename is
md-fix-a-plug-unplug-race-in-raid5.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: md: fix a plug/unplug race in raid5
From: NeilBrown <neilb@xxxxxxx>
When a device is unplugged, requests are moved from one or two (depending on
whether a bitmap is in use) queues to the main request queue.
So whenever requests are put on either of those queues, we should make sure
the raid5 array is 'plugged'. However we don't. We currently plug the raid5
queue just before putting requests on queues, so there is room for a race. If
something unplugs the queue at just the wrong time, requests will be left on
the queue and nothing will want to unplug them. Normally something else will
plug and unplug the queue fairly soon, but there is a risk that nothing will.
Signed-off-by: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/md/raid5.c | 18 ++++++------------
1 file changed, 6 insertions(+), 12 deletions(-)
diff -puN drivers/md/raid5.c~md-fix-a-plug-unplug-race-in-raid5 drivers/md/raid5.c
--- a/drivers/md/raid5.c~md-fix-a-plug-unplug-race-in-raid5
+++ a/drivers/md/raid5.c
@@ -88,12 +88,14 @@ static void __release_stripe(raid5_conf_
BUG_ON(!list_empty(&sh->lru));
BUG_ON(atomic_read(&conf->active_stripes)==0);
if (test_bit(STRIPE_HANDLE, &sh->state)) {
- if (test_bit(STRIPE_DELAYED, &sh->state))
+ if (test_bit(STRIPE_DELAYED, &sh->state)) {
list_add_tail(&sh->lru, &conf->delayed_list);
- else if (test_bit(STRIPE_BIT_DELAY, &sh->state) &&
- conf->seq_write == sh->bm_seq)
+ blk_plug_device(conf->mddev->queue);
+ } else if (test_bit(STRIPE_BIT_DELAY, &sh->state) &&
+ conf->seq_write == sh->bm_seq) {
list_add_tail(&sh->lru, &conf->bitmap_list);
- else {
+ blk_plug_device(conf->mddev->queue);
+ } else {
clear_bit(STRIPE_BIT_DELAY, &sh->state);
list_add_tail(&sh->lru, &conf->handle_list);
}
@@ -2555,13 +2557,6 @@ static int raid5_issue_flush(request_que
return ret;
}
-static inline void raid5_plug_device(raid5_conf_t *conf)
-{
- spin_lock_irq(&conf->device_lock);
- blk_plug_device(conf->mddev->queue);
- spin_unlock_irq(&conf->device_lock);
-}
-
static int make_request(request_queue_t *q, struct bio * bi)
{
mddev_t *mddev = q->queuedata;
@@ -2671,7 +2666,6 @@ static int make_request(request_queue_t
goto retry;
}
finish_wait(&conf->wait_for_overlap, &w);
- raid5_plug_device(conf);
handle_stripe(sh, NULL);
release_stripe(sh);
} else {
_
Patches currently in -mm which might be from neilb@xxxxxxx are
origin.patch
git-klibc.patch
md-dm-reduce-stack-usage-with-stacked-block-devices.patch
-
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