include/linux/pnfs_osd_xdr.h

   1 /*
   2  *  pNFS-osd on-the-wire data structures
   3  *
   4  *  Copyright (C) 2007 Panasas Inc. [year of first publication]
   5  *  All rights reserved.
   6  *
   7  *  Benny Halevy <bhalevy@panasas.com>
   8  *  Boaz Harrosh <bharrosh@panasas.com>
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2
  12  *  See the file COPYING included with this distribution for more details.
  13  *
  14  *  Redistribution and use in source and binary forms, with or without
  15  *  modification, are permitted provided that the following conditions
  16  *  are met:
  17  *
  18  *  1. Redistributions of source code must retain the above copyright
  19  *     notice, this list of conditions and the following disclaimer.
  20  *  2. Redistributions in binary form must reproduce the above copyright
  21  *     notice, this list of conditions and the following disclaimer in the
  22  *     documentation and/or other materials provided with the distribution.
  23  *  3. Neither the name of the Panasas company nor the names of its
  24  *     contributors may be used to endorse or promote products derived
  25  *     from this software without specific prior written permission.
  26  *
  27  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  28  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  29  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  30  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  32  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  33  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  34  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  35  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  36  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  37  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  38  */
  39 #ifndef __PNFS_OSD_XDR_H__
  40 #define __PNFS_OSD_XDR_H__
  41
  42 #include <linux/nfs_fs.h>
  43
  44 /*
  45  * draft-ietf-nfsv4-minorversion-22
  46  * draft-ietf-nfsv4-pnfs-obj-12
  47  */
  48
  49 /* Layout Structure */
  50
  51 enum pnfs_osd_raid_algorithm4 {
  52         PNFS_OSD_RAID_0         = 1,
  53         PNFS_OSD_RAID_4         = 2,
  54         PNFS_OSD_RAID_5         = 3,
  55         PNFS_OSD_RAID_PQ        = 4     /* Reed-Solomon P+Q */
  56 };
  57
  58 /*   struct pnfs_osd_data_map4 {
  59  *       uint32_t                    odm_num_comps;
  60  *       length4                     odm_stripe_unit;
  61  *       uint32_t                    odm_group_width;
  62  *       uint32_t                    odm_group_depth;
  63  *       uint32_t                    odm_mirror_cnt;
  64  *       pnfs_osd_raid_algorithm4    odm_raid_algorithm;
  65  *   };
  66  */
  67 struct pnfs_osd_data_map {
  68         u32     odm_num_comps;
  69         u64     odm_stripe_unit;
  70         u32     odm_group_width;
  71         u32     odm_group_depth;
  72         u32     odm_mirror_cnt;
  73         u32     odm_raid_algorithm;
  74 };
  75
  76 /*   struct pnfs_osd_objid4 {
  77  *       deviceid4       oid_device_id;
  78  *       uint64_t        oid_partition_id;
  79  *       uint64_t        oid_object_id;
  80  *   };
  81  */
  82 struct pnfs_osd_objid {
  83         struct nfs4_deviceid    oid_device_id;
  84         u64                     oid_partition_id;
  85         u64                     oid_object_id;
  86 };
  87
  88 /* For printout. I use:
  89  * kprint("dev(%llx:%llx)", _DEVID_LO(pointer), _DEVID_HI(pointer));
  90  * BE style
  91  */
  92 #define _DEVID_LO(oid_device_id) \
  93         (unsigned long long)be64_to_cpup((__be64 *)(oid_device_id)->data)
  94
  95 #define _DEVID_HI(oid_device_id) \
  96         (unsigned long long)be64_to_cpup(((__be64 *)(oid_device_id)->data) + 1)
  97
  98 enum pnfs_osd_version {
  99         PNFS_OSD_MISSING              = 0,
 100         PNFS_OSD_VERSION_1            = 1,
 101         PNFS_OSD_VERSION_2            = 2
 102 };
 103
 104 struct pnfs_osd_opaque_cred {
 105         u32 cred_len;
 106         void *cred;
 107 };
 108
 109 enum pnfs_osd_cap_key_sec {
 110         PNFS_OSD_CAP_KEY_SEC_NONE     = 0,
 111         PNFS_OSD_CAP_KEY_SEC_SSV      = 1,
 112 };
 113
 114 /*   struct pnfs_osd_object_cred4 {
 115  *       pnfs_osd_objid4         oc_object_id;
 116  *       pnfs_osd_version4       oc_osd_version;
 117  *       pnfs_osd_cap_key_sec4   oc_cap_key_sec;
 118  *       opaque                  oc_capability_key<>;
 119  *       opaque                  oc_capability<>;
 120  *   };
 121  */
 122 struct pnfs_osd_object_cred {
 123         struct pnfs_osd_objid           oc_object_id;
 124         u32                             oc_osd_version;
 125         u32                             oc_cap_key_sec;
 126         struct pnfs_osd_opaque_cred     oc_cap_key;
 127         struct pnfs_osd_opaque_cred     oc_cap;
 128 };
 129
 130 /*   struct pnfs_osd_layout4 {
 131  *       pnfs_osd_data_map4      olo_map;
 132  *       uint32_t                olo_comps_index;
 133  *       pnfs_osd_object_cred4   olo_components<>;
 134  *   };
 135  */
 136 struct pnfs_osd_layout {
 137         struct pnfs_osd_data_map        olo_map;
 138         u32                             olo_comps_index;
 139         u32                             olo_num_comps;
 140         struct pnfs_osd_object_cred     *olo_comps;
 141 };
 142
 143 /* Device Address */
 144 enum pnfs_osd_targetid_type {
 145         OBJ_TARGET_ANON = 1,
 146         OBJ_TARGET_SCSI_NAME = 2,
 147         OBJ_TARGET_SCSI_DEVICE_ID = 3,
 148 };
 149
 150 /*   union pnfs_osd_targetid4 switch (pnfs_osd_targetid_type4 oti_type) {
 151  *       case OBJ_TARGET_SCSI_NAME:
 152  *           string              oti_scsi_name<>;
 153  *
 154  *       case OBJ_TARGET_SCSI_DEVICE_ID:
 155  *           opaque              oti_scsi_device_id<>;
 156  *
 157  *       default:
 158  *           void;
 159  *   };
 160  *
 161  *   union pnfs_osd_targetaddr4 switch (bool ota_available) {
 162  *       case TRUE:
 163  *           netaddr4            ota_netaddr;
 164  *       case FALSE:
 165  *           void;
 166  *   };
 167  *
 168  *   struct pnfs_osd_deviceaddr4 {
 169  *       pnfs_osd_targetid4      oda_targetid;
 170  *       pnfs_osd_targetaddr4    oda_targetaddr;
 171  *       uint64_t                oda_lun;
 172  *       opaque                  oda_systemid<>;
 173  *       pnfs_osd_object_cred4   oda_root_obj_cred;
 174  *       opaque                  oda_osdname<>;
 175  *   };
 176  */
 177 struct pnfs_osd_targetid {
 178         u32                             oti_type;
 179         struct nfs4_string              oti_scsi_device_id;
 180 };
 181
 182 /*   struct netaddr4 {
 183  *       // see struct rpcb in RFC1833
 184  *       string r_netid<>;    // network id
 185  *       string r_addr<>;     // universal address
 186  *   };
 187  */
 188 struct pnfs_osd_net_addr {
 189         struct nfs4_string      r_netid;
 190         struct nfs4_string      r_addr;
 191 };
 192
 193 struct pnfs_osd_targetaddr {
 194         u32                             ota_available;
 195         struct pnfs_osd_net_addr        ota_netaddr;
 196 };
 197
 198 struct pnfs_osd_deviceaddr {
 199         struct pnfs_osd_targetid        oda_targetid;
 200         struct pnfs_osd_targetaddr      oda_targetaddr;
 201         u8                              oda_lun[8];
 202         struct nfs4_string              oda_systemid;
 203         struct pnfs_osd_object_cred     oda_root_obj_cred;
 204         struct nfs4_string              oda_osdname;
 205 };
 206
 207 /* LAYOUTCOMMIT: layoutupdate */
 208
 209 /*   union pnfs_osd_deltaspaceused4 switch (bool dsu_valid) {
 210  *       case TRUE:
 211  *           int64_t     dsu_delta;
 212  *       case FALSE:
 213  *           void;
 214  *   };
 215  *
 216  *   struct pnfs_osd_layoutupdate4 {
 217  *       pnfs_osd_deltaspaceused4    olu_delta_space_used;
 218  *       bool                        olu_ioerr_flag;
 219  *   };
 220  */
 221 struct pnfs_osd_layoutupdate {
 222         u32     dsu_valid;
 223         s64     dsu_delta;
 224         u32     olu_ioerr_flag;
 225 };
 226
 227 /* LAYOUTRETURN: I/O Rrror Report */
 228
 229 enum pnfs_osd_errno {
 230         PNFS_OSD_ERR_EIO                = 1,
 231         PNFS_OSD_ERR_NOT_FOUND          = 2,
 232         PNFS_OSD_ERR_NO_SPACE           = 3,
 233         PNFS_OSD_ERR_BAD_CRED           = 4,
 234         PNFS_OSD_ERR_NO_ACCESS          = 5,
 235         PNFS_OSD_ERR_UNREACHABLE        = 6,
 236         PNFS_OSD_ERR_RESOURCE           = 7
 237 };
 238
 239 /*   struct pnfs_osd_ioerr4 {
 240  *       pnfs_osd_objid4     oer_component;
 241  *       length4             oer_comp_offset;
 242  *       length4             oer_comp_length;
 243  *       bool                oer_iswrite;
 244  *       pnfs_osd_errno4     oer_errno;
 245  *   };
 246  */
 247 struct pnfs_osd_ioerr {
 248         struct pnfs_osd_objid   oer_component;
 249         u64                     oer_comp_offset;
 250         u64                     oer_comp_length;
 251         u32                     oer_iswrite;
 252         u32                     oer_errno;
 253 };
 254
 255 /* OSD XDR Client API */
 256 /* Layout helpers */
 257 /* Layout decoding is done in two parts:
 258  * 1. First Call pnfs_osd_xdr_decode_layout_map to read in only the header part
 259  *    of the layout. @iter members need not be initialized.
 260  *    Returned:
 261  *             @layout members are set. (@layout->olo_comps set to NULL).
 262  *
 263  *             Zero on success, or negative error if passed xdr is broken.
 264  *
 265  * 2. 2nd Call pnfs_osd_xdr_decode_layout_comp() in a loop until it returns
 266  *    false, to decode the next component.
 267  *    Returned:
 268  *       true if there is more to decode or false if we are done or error.
 269  *
 270  * Example:
 271  *      struct pnfs_osd_xdr_decode_layout_iter iter;
 272  *      struct pnfs_osd_layout layout;
 273  *      struct pnfs_osd_object_cred comp;
 274  *      int status;
 275  *
 276  *      status = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr);
 277  *      if (unlikely(status))
 278  *              goto err;
 279  *      while(pnfs_osd_xdr_decode_layout_comp(&comp, &iter, xdr, &status)) {
 280  *              // All of @comp strings point to inside the xdr_buffer
 281  *              // or scrach buffer. Copy them out to user memory eg.
 282  *              copy_single_comp(dest_comp++, &comp);
 283  *      }
 284  *      if (unlikely(status))
 285  *              goto err;
 286  */
 287
 288 struct pnfs_osd_xdr_decode_layout_iter {
 289         unsigned total_comps;
 290         unsigned decoded_comps;
 291 };
 292
 293 extern int pnfs_osd_xdr_decode_layout_map(struct pnfs_osd_layout *layout,
 294         struct pnfs_osd_xdr_decode_layout_iter *iter, struct xdr_stream *xdr);
 295
 296 extern bool pnfs_osd_xdr_decode_layout_comp(struct pnfs_osd_object_cred *comp,
 297         struct pnfs_osd_xdr_decode_layout_iter *iter, struct xdr_stream *xdr,
 298         int *err);
 299
 300 /* Device Info helpers */
 301
 302 /* Note: All strings inside @deviceaddr point to space inside @p.
 303  * @p should stay valid while @deviceaddr is in use.
 304  */
 305 extern void pnfs_osd_xdr_decode_deviceaddr(
 306         struct pnfs_osd_deviceaddr *deviceaddr, __be32 *p);
 307
 308 /* layoutupdate (layout_commit) xdr helpers */
 309 extern int
 310 pnfs_osd_xdr_encode_layoutupdate(struct xdr_stream *xdr,
 311                                  struct pnfs_osd_layoutupdate *lou);
 312
 313 /* osd_ioerror encoding (layout_return) */
 314 extern __be32 *pnfs_osd_xdr_ioerr_reserve_space(struct xdr_stream *xdr);
 315 extern void pnfs_osd_xdr_encode_ioerr(__be32 *p, struct pnfs_osd_ioerr *ioerr);
 316
 317 #endif /* __PNFS_OSD_XDR_H__ */