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Subject[PATCH 07/10] nbd: move request validity checking into nbd_send_cmd
Date
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>
---
drivers/block/nbd.c | 21 ++++++++++-----------
1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index d4c6281..8bce1c7c 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -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];
--
2.1.4
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