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nbd: freeze the queue for queue limits updates

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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@lst.de>
Link: https://lore.kernel.org/r/20240229143846.1047223-3-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-02-29 06:38:45 -08:00 committed by Jens Axboe
parent 7ea201f2cc
commit 242a49e5c8
1 changed files with 13 additions and 1 deletions
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14
drivers/block/nbd.c
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@ -316,7 +316,7 @@ static void nbd_mark_nsock_dead(struct nbd_device *nbd, struct nbd_sock *nsock,
nsock->sent = 0; 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) loff_t blksize)
{ {
if (!blksize) if (!blksize)
@ -348,6 +348,18 @@ static int nbd_set_size(struct nbd_device *nbd, loff_t bytesize,
return 0; 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) static void nbd_complete_rq(struct request *req)
{ {
struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req); struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req);