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nbd: move request validity checking into nbd_send_cmd 

This is where we do the rest of the request handling, which will
become much simpler soon, too.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2017-01-31 16:57:28 +01:00 committed by Jens Axboe
parent 27410a8927
commit 09fc54ccc4
1 changed files with 10 additions and 11 deletions
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21
drivers/block/nbd.c
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@ -271,6 +271,9 @@ static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index)
u32 type;
u32 tag = blk_mq_unique_tag(req);
if (req->cmd_type != REQ_TYPE_FS)
return -EIO;
if (req_op(req) == REQ_OP_DISCARD)
type = NBD_CMD_TRIM;
else if (req_op(req) == REQ_OP_FLUSH)
@ -280,6 +283,13 @@ static int nbd_send_cmd(struct nbd_device *nbd, struct nbd_cmd *cmd, int index)
else
type = NBD_CMD_READ;
if (rq_data_dir(req) == WRITE &&
(nbd->flags & NBD_FLAG_READ_ONLY)) {
dev_err_ratelimited(disk_to_dev(nbd->disk),
"Write on read-only\n");
return -EIO;
}
memset(&request, 0, sizeof(request));
request.magic = htonl(NBD_REQUEST_MAGIC);
request.type = htonl(type);
@ -503,17 +513,6 @@ static void nbd_handle_cmd(struct nbd_cmd *cmd, int index)
goto error_out;
}
if (req->cmd_type != REQ_TYPE_FS)
goto error_out;
if (req->cmd_type == REQ_TYPE_FS &&
rq_data_dir(req) == WRITE &&
(nbd->flags & NBD_FLAG_READ_ONLY)) {
dev_err_ratelimited(disk_to_dev(nbd->disk),
"Write on read-only\n");
goto error_out;
}
req->errors = 0;
nsock = nbd->socks[index];