[PATCH 07/10] nbd: move request validity checking into nbd_send_cmd
From: Christoph Hellwig <hch@lst.de>
Date: 2017-01-31 16:20:31
Also in:
linux-ide, linux-scsi, lkml
Subsystem:
block layer, network block device (nbd), the rest · Maintainers:
Jens Axboe, Josef Bacik, Linus Torvalds
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