cifs: Add smb2_send_recv

This function is similar to SendReceive2 except it does not expect
a 4 byte rfc1002 length header in the first io vector.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <smfrench@gmail.com>

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 4143c9d..93d5651 100644 (file)
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -106,6 +106,10 @@ extern int SendReceive2(const unsigned int /* xid */ , struct cifs_ses *,
                        struct kvec *, int /* nvec to send */,
                        int * /* type of buf returned */, const int flags,
                        struct kvec * /* resp vec */);
+extern int smb2_send_recv(const unsigned int xid, struct cifs_ses *pses,
+                         struct kvec *pkvec, int nvec_to_send,
+                         int *pbuftype, const int flags,
+                         struct kvec *presp);
 extern int SendReceiveBlockingLock(const unsigned int xid,
                        struct cifs_tcon *ptcon,
                        struct smb_hdr *in_buf ,

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 7efbab0..e678307 100644 (file)
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -827,6 +827,44 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses,
        return rc;
 }
 
+/* Like SendReceive2 but iov[0] does not contain an rfc1002 header */
+int
+smb2_send_recv(const unsigned int xid, struct cifs_ses *ses,
+              struct kvec *iov, int n_vec, int *resp_buf_type /* ret */,
+              const int flags, struct kvec *resp_iov)
+{
+       struct smb_rqst rqst;
+       struct kvec *new_iov;
+       int rc;
+       int i;
+       __u32 count;
+       __be32 rfc1002_marker;
+
+       new_iov = kmalloc(sizeof(struct kvec) * (n_vec + 1), GFP_KERNEL);
+       if (!new_iov)
+               return -ENOMEM;
+
+       /* 1st iov is an RFC1002 Session Message length */
+       memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec));
+
+       count = 0;
+       for (i = 1; i < n_vec + 1; i++)
+               count += new_iov[i].iov_len;
+
+       rfc1002_marker = cpu_to_be32(count);
+
+       new_iov[0].iov_base = &rfc1002_marker;
+       new_iov[0].iov_len = 4;
+
+       memset(&rqst, 0, sizeof(struct smb_rqst));
+       rqst.rq_iov = new_iov;
+       rqst.rq_nvec = n_vec + 1;
+
+       rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov);
+       kfree(new_iov);
+       return rc;
+}
+
 int
 SendReceive(const unsigned int xid, struct cifs_ses *ses,
            struct smb_hdr *in_buf, struct smb_hdr *out_buf,