nbd currently updates the logical and physical block sizes as well
as the discard_sectors on a live queue. Freeze the queue first to
make sure there are not commands in flight that can see torn or
inconsistent limits.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
drivers/block/nbd.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 384750d5259fb8..22ee0ed9aa6db0 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -316,7 +316,7 @@ static void nbd_mark_nsock_dead(struct nbd_device *nbd, struct nbd_sock *nsock,
nsock->sent = 0;
}
-static int nbd_set_size(struct nbd_device *nbd, loff_t bytesize,
+static int __nbd_set_size(struct nbd_device *nbd, loff_t bytesize,
loff_t blksize)
{
if (!blksize)
@@ -348,6 +348,18 @@ static int nbd_set_size(struct nbd_device *nbd, loff_t bytesize,
return 0;
}
+static int nbd_set_size(struct nbd_device *nbd, loff_t bytesize,
+ loff_t blksize)
+{
+ int error;
+
+ blk_mq_freeze_queue(nbd->disk->queue);
+ error = __nbd_set_size(nbd, bytesize, blksize);
+ blk_mq_unfreeze_queue(nbd->disk->queue);
+
+ return error;
+}
+
static void nbd_complete_rq(struct request *req)
{
struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req);
--
2.39.2
