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CIFS: Add readpage support for SMB2

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Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky
2012-09-18 16:20:30 -07:00
committed by Steve French
parent f9c6e234c3
commit d8e050398d
3 changed files with 65 additions and 0 deletions
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51
fs/cifs/smb2pdu.c
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@@ -1329,6 +1329,57 @@ smb2_async_readv(struct cifs_readdata *rdata)
return rc;
}
int
SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
unsigned int *nbytes, char **buf, int *buf_type)
{
int resp_buftype, rc = -EACCES;
struct smb2_read_rsp *rsp = NULL;
struct kvec iov[1];
*nbytes = 0;
rc = smb2_new_read_req(iov, io_parms, 0, 0);
if (rc)
return rc;
rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
&resp_buftype, CIFS_LOG_ERROR);
rsp = (struct smb2_read_rsp *)iov[0].iov_base;
if (rsp->hdr.Status == STATUS_END_OF_FILE) {
free_rsp_buf(resp_buftype, iov[0].iov_base);
return 0;
}
if (rc) {
cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
cERROR(1, "Send error in read = %d", rc);
} else {
*nbytes = le32_to_cpu(rsp->DataLength);
if ((*nbytes > CIFS_MAX_MSGSIZE) ||
(*nbytes > io_parms->length)) {
cFYI(1, "bad length %d for count %d", *nbytes,
io_parms->length);
rc = -EIO;
*nbytes = 0;
}
}
if (*buf) {
memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
*nbytes);
free_rsp_buf(resp_buftype, iov[0].iov_base);
} else if (resp_buftype != CIFS_NO_BUFFER) {
*buf = iov[0].iov_base;
if (resp_buftype == CIFS_SMALL_BUFFER)
*buf_type = CIFS_SMALL_BUFFER;
else if (resp_buftype == CIFS_LARGE_BUFFER)
*buf_type = CIFS_LARGE_BUFFER;
}
return rc;
}
/*
* Check the mid_state and signature on received buffer (if any), and queue the
* workqueue completion task.