The patch titled
Subject: nbd: clear waiting_queue on shutdown
has been removed from the -mm tree. Its filename was
nbd-clear-waiting_queue-on-shutdown.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Paul Clements <paul.cleme...@steeleye.com>
Subject: nbd: clear waiting_queue on shutdown
Fix a serious but uncommon bug in nbd which occurs when there is heavy I/O
going to the nbd device while, at the same time, a failure (server,
network) or manual disconnect of the nbd connection occurs.
There is a small window between the time that the nbd_thread is stopped
and the socket is shutdown where requests can continue to be queued to
nbd's internal waiting_queue. When this happens, those requests are never
completed or freed.
The fix is to clear the waiting_queue on shutdown of the nbd device, in
the same way that the nbd request queue (queue_head) is already being cleared.
Signed-off-by: Paul Clements <paul.cleme...@steeleye.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
---
drivers/block/nbd.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff -puN drivers/block/nbd.c~nbd-clear-waiting_queue-on-shutdown
drivers/block/nbd.c
--- a/drivers/block/nbd.c~nbd-clear-waiting_queue-on-shutdown
+++ a/drivers/block/nbd.c
@@ -449,6 +449,14 @@ static void nbd_clear_que(struct nbd_dev
req->errors++;
nbd_end_request(req);
}
+
+ while (!list_empty(&nbd->waiting_queue)) {
+ req = list_entry(nbd->waiting_queue.next, struct request,
+ queuelist);
+ list_del_init(&req->queuelist);
+ req->errors++;
+ nbd_end_request(req);
+ }
}
@@ -598,6 +606,7 @@ static int __nbd_ioctl(struct block_devi
nbd->file = NULL;
nbd_clear_que(nbd);
BUG_ON(!list_empty(&nbd->queue_head));
+ BUG_ON(!list_empty(&nbd->waiting_queue));
if (file)
fput(file);
return 0;
_
Patches currently in -mm which might be from paul.cleme...@steeleye.com are
origin.patch
nbd-add-set-flags-ioctl.patch
nbd-handle-discard-requests.patch
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