2017-11-07 0:54 GMT-08:00 Long Li <longli@xxxxxxxxxxxxxxxxxxxxxx>:
> From: Long Li <longli@xxxxxxxxxxxxx>
>
> This patch is for preparing upper layer for doing SMB read via RDMA write.
>
> When we assemble the SMB read packet header, we need to know the I/O layout
> if this request is to use a RDMA write. rdata has all the information we need
> for memory registration. Add rdata to smb2_new_read_req.
>
> Signed-off-by: Long Li <longli@xxxxxxxxxxxxx>
> ---
> fs/cifs/smb2pdu.c | 14 +++++++++-----
> 1 file changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
> index bab3da6..32ad590 100644
> --- a/fs/cifs/smb2pdu.c
> +++ b/fs/cifs/smb2pdu.c
> @@ -2350,18 +2350,21 @@ SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
> */
> static int
> smb2_new_read_req(void **buf, unsigned int *total_len,
> - struct cifs_io_parms *io_parms, unsigned int remaining_bytes,
> - int request_type)
> + struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
> + unsigned int remaining_bytes, int request_type)
> {
> int rc = -EACCES;
> struct smb2_read_plain_req *req = NULL;
> struct smb2_sync_hdr *shdr;
> + struct TCP_Server_Info *server;
>
> rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
> total_len);
> if (rc)
> return rc;
> - if (io_parms->tcon->ses->server == NULL)
> +
> + server = io_parms->tcon->ses->server;
> + if (server == NULL)
> return -ECONNABORTED;
>
> shdr = &req->sync_hdr;
> @@ -2489,7 +2492,8 @@ smb2_async_readv(struct cifs_readdata *rdata)
>
> server = io_parms.tcon->ses->server;
>
> - rc = smb2_new_read_req((void **) &buf, &total_len, &io_parms, 0, 0);
> + rc = smb2_new_read_req(
> + (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
> if (rc) {
> if (rc == -EAGAIN && rdata->credits) {
> /* credits was reset by reconnect */
> @@ -2557,7 +2561,7 @@ SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
> struct cifs_ses *ses = io_parms->tcon->ses;
>
> *nbytes = 0;
> - rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
> + rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
> if (rc)
> return rc;
>
> --
> 2.7.4
>
> --
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Looks good.
Reviewed-by: Pavel Shilovsky <pshilov@xxxxxxxxxxxxx>
--
Best regards,
Pavel Shilovsky
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