CIFS: Add writepage support for SMB2
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 23c5693..00dc45a 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1501,3 +1501,64 @@
kfree(iov);
return rc;
}
+
+/*
+ * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
+ * The length field from io_parms must be at least 1 and indicates a number of
+ * elements with data to write that begins with position 1 in iov array. All
+ * data length is specified by count.
+ */
+int
+SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
+ unsigned int *nbytes, struct kvec *iov, int n_vec)
+{
+ int rc = 0;
+ struct smb2_write_req *req = NULL;
+ struct smb2_write_rsp *rsp = NULL;
+ int resp_buftype;
+ *nbytes = 0;
+
+ if (n_vec < 1)
+ return rc;
+
+ rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
+ if (rc)
+ return rc;
+
+ if (io_parms->tcon->ses->server == NULL)
+ return -ECONNABORTED;
+
+ req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
+
+ req->PersistentFileId = io_parms->persistent_fid;
+ req->VolatileFileId = io_parms->volatile_fid;
+ req->WriteChannelInfoOffset = 0;
+ req->WriteChannelInfoLength = 0;
+ req->Channel = 0;
+ req->Length = cpu_to_le32(io_parms->length);
+ req->Offset = cpu_to_le64(io_parms->offset);
+ /* 4 for rfc1002 length field */
+ req->DataOffset = cpu_to_le16(
+ offsetof(struct smb2_write_req, Buffer) - 4);
+ req->RemainingBytes = 0;
+
+ iov[0].iov_base = (char *)req;
+ /* 4 for rfc1002 length field and 1 for Buffer */
+ iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
+
+ /* length of entire message including data to be written */
+ inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
+
+ rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
+ &resp_buftype, 0);
+
+ if (rc) {
+ cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
+ cERROR(1, "Send error in write = %d", rc);
+ } else {
+ rsp = (struct smb2_write_rsp *)iov[0].iov_base;
+ *nbytes = le32_to_cpu(rsp->DataLength);
+ free_rsp_buf(resp_buftype, rsp);
+ }
+ return rc;
+}