net/9p/trans_common.h

   1 /*
   2  * Copyright IBM Corporation, 2010
   3  * Author Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2.1 of the GNU Lesser General Public License
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12  *
  13  */
  14
  15 /* TRUE if it is user context */
  16 #define P9_IS_USER_CONTEXT (!segment_eq(get_fs(), KERNEL_DS))
  17
  18 /**
  19  * struct trans_rpage_info - To store mapped page information in PDU.
  20  * @rp_alloc:Set if this structure is allocd, not a reuse unused space in pdu.
  21  * @rp_nr_pages: Number of mapped pages
  22  * @rp_data: Array of page pointers
  23  */
  24 struct trans_rpage_info {
  25         u8 rp_alloc;
  26         int rp_nr_pages;
  27         struct page *rp_data[0];
  28 };
  29
  30 void p9_release_req_pages(struct trans_rpage_info *);
  31 int p9_payload_gup(struct p9_req_t *, size_t *, int *, int, u8);
  32 int p9_nr_pages(struct p9_req_t *);