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nbd: Improve the documentation of the locking assumptions
Document locking assumptions with lockdep_assert_held() instead of source code comments. The advantage of lockdep_assert_held() is that it is verified at runtime if lockdep is enabled in the kernel config. Cc: Christoph Hellwig <hch@lst.de> Cc: Josef Bacik <jbacik@fb.com> Cc: Yu Kuai <yukuai3@huawei.com> Cc: Markus Pargmann <mpa@pengutronix.de> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20240510202313.25209-4-bvanassche@acm.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -588,7 +588,6 @@ static inline int was_interrupted(int result)
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return result == -ERESTARTSYS || result == -EINTR;
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}
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/* always call with the tx_lock held */
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static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index)
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{
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struct request *req = blk_mq_rq_from_pdu(cmd);
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@ -605,6 +604,9 @@ static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index)
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u32 nbd_cmd_flags = 0;
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int sent = nsock->sent, skip = 0;
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lockdep_assert_held(&cmd->lock);
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lockdep_assert_held(&nsock->tx_lock);
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iov_iter_kvec(&from, ITER_SOURCE, &iov, 1, sizeof(request));
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type = req_to_nbd_cmd_type(req);
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@ -1015,6 +1017,8 @@ static int nbd_handle_cmd(struct nbd_cmd *cmd, int index)
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struct nbd_sock *nsock;
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int ret;
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lockdep_assert_held(&cmd->lock);
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config = nbd_get_config_unlocked(nbd);
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if (!config) {
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dev_err_ratelimited(disk_to_dev(nbd->disk),
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