From 009d344398bb3e844b31eb9e6a7860748c6f6dd3 Mon Sep 17 00:00:00 2001 From: Pavel Shilovsky Date: Tue, 18 Sep 2012 16:20:30 -0700 Subject: CIFS: Add writepage support for SMB2 Signed-off-by: Pavel Shilovsky Signed-off-by: Steve French --- fs/cifs/smb2pdu.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) (limited to 'fs/cifs/smb2pdu.c') diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 23c569386f3..00dc45a7881 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -1501,3 +1501,64 @@ async_writev_out: 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; +} -- cgit v1.2.3-70-g09d2