This is a note to let you know that I've just added the patch titled
md/raid1: count resync requests in nr_pending.
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
md-raid1-count-resync-requests-in-nr_pending.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 34e97f170149bfa14979581c4c748bc9b4b79d5b Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@xxxxxxx>
Date: Tue, 16 Sep 2014 12:14:14 +1000
Subject: md/raid1: count resync requests in nr_pending.
From: NeilBrown <neilb@xxxxxxx>
commit 34e97f170149bfa14979581c4c748bc9b4b79d5b upstream.
Both normal IO and resync IO can be retried with reschedule_retry()
and so be counted into ->nr_queued, but only normal IO gets counted in
->nr_pending.
Before the recent improvement to RAID1 resync there could only
possibly have been one or the other on the queue. When handling a
read failure it could only be normal IO. So when handle_read_error()
called freeze_array() the fact that freeze_array only compares
->nr_queued against ->nr_pending was safe.
But now that these two types can interleave, we can have both normal
and resync IO requests queued, so we need to count them both in
nr_pending.
This error can lead to freeze_array() hanging if there is a read
error, so it is suitable for -stable.
Fixes: 79ef3a8aa1cb1523cc231c9a90a278333c21f761
Reported-by: Brassow Jonathan <jbrassow@xxxxxxxxxx>
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/raid1.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -856,6 +856,7 @@ static void raise_barrier(struct r1conf
conf->next_resync + RESYNC_SECTORS),
conf->resync_lock);
+ conf->nr_pending++;
spin_unlock_irq(&conf->resync_lock);
}
@@ -865,6 +866,7 @@ static void lower_barrier(struct r1conf
BUG_ON(conf->barrier <= 0);
spin_lock_irqsave(&conf->resync_lock, flags);
conf->barrier--;
+ conf->nr_pending--;
spin_unlock_irqrestore(&conf->resync_lock, flags);
wake_up(&conf->wait_barrier);
}
Patches currently in stable-queue which might be from neilb@xxxxxxx are
queue-3.14/md-raid1-fix_read_error-should-act-on-all-non-faulty-devices.patch
queue-3.14/md-raid1-count-resync-requests-in-nr_pending.patch
queue-3.14/md-raid1-update-next_resync-under-resync_lock.patch
queue-3.14/md-raid1-intialise-start_next_window-for-read-case-to-avoid-hang.patch
queue-3.14/md-raid1-don-t-use-next_resync-to-determine-how-far-resync-has-progressed.patch
queue-3.14/md-raid1-be-more-cautious-where-we-read-balance-during-resync.patch
queue-3.14/md-raid1-make-sure-resync-waits-for-conflicting-writes-to-complete.patch
queue-3.14/md-raid1-clean-up-request-counts-properly-in-close_sync.patch
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