kernel/fs/nfs/objlayout/pnfs_osd_xdr_cli.c

   1 /*
   2  *  Object-Based pNFS Layout XDR layer
   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 <ooo@electrozaur.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
  40 #include <linux/pnfs_osd_xdr.h>
  41
  42 #define NFSDBG_FACILITY         NFSDBG_PNFS_LD
  43
  44 /*
  45  * The following implementation is based on RFC5664
  46  */
  47
  48 /*
  49  * struct pnfs_osd_objid {
  50  *      struct nfs4_deviceid    oid_device_id;
  51  *      u64                     oid_partition_id;
  52  *      u64                     oid_object_id;
  53  * }; // xdr size 32 bytes
  54  */
  55 static __be32 *
  56 _osd_xdr_decode_objid(__be32 *p, struct pnfs_osd_objid *objid)
  57 {
  58         p = xdr_decode_opaque_fixed(p, objid->oid_device_id.data,
  59                                     sizeof(objid->oid_device_id.data));
  60
  61         p = xdr_decode_hyper(p, &objid->oid_partition_id);
  62         p = xdr_decode_hyper(p, &objid->oid_object_id);
  63         return p;
  64 }
  65 /*
  66  * struct pnfs_osd_opaque_cred {
  67  *      u32 cred_len;
  68  *      void *cred;
  69  * }; // xdr size [variable]
  70  * The return pointers are from the xdr buffer
  71  */
  72 static int
  73 _osd_xdr_decode_opaque_cred(struct pnfs_osd_opaque_cred *opaque_cred,
  74                             struct xdr_stream *xdr)
  75 {
  76         __be32 *p = xdr_inline_decode(xdr, 1);
  77
  78         if (!p)
  79                 return -EINVAL;
  80
  81         opaque_cred->cred_len = be32_to_cpu(*p++);
  82
  83         p = xdr_inline_decode(xdr, opaque_cred->cred_len);
  84         if (!p)
  85                 return -EINVAL;
  86
  87         opaque_cred->cred = p;
  88         return 0;
  89 }
  90
  91 /*
  92  * struct pnfs_osd_object_cred {
  93  *      struct pnfs_osd_objid           oc_object_id;
  94  *      u32                             oc_osd_version;
  95  *      u32                             oc_cap_key_sec;
  96  *      struct pnfs_osd_opaque_cred     oc_cap_key
  97  *      struct pnfs_osd_opaque_cred     oc_cap;
  98  * }; // xdr size 32 + 4 + 4 + [variable] + [variable]
  99  */
 100 static int
 101 _osd_xdr_decode_object_cred(struct pnfs_osd_object_cred *comp,
 102                             struct xdr_stream *xdr)
 103 {
 104         __be32 *p = xdr_inline_decode(xdr, 32 + 4 + 4);
 105         int ret;
 106
 107         if (!p)
 108                 return -EIO;
 109
 110         p = _osd_xdr_decode_objid(p, &comp->oc_object_id);
 111         comp->oc_osd_version = be32_to_cpup(p++);
 112         comp->oc_cap_key_sec = be32_to_cpup(p);
 113
 114         ret = _osd_xdr_decode_opaque_cred(&comp->oc_cap_key, xdr);
 115         if (unlikely(ret))
 116                 return ret;
 117
 118         ret = _osd_xdr_decode_opaque_cred(&comp->oc_cap, xdr);
 119         return ret;
 120 }
 121
 122 /*
 123  * struct pnfs_osd_data_map {
 124  *      u32     odm_num_comps;
 125  *      u64     odm_stripe_unit;
 126  *      u32     odm_group_width;
 127  *      u32     odm_group_depth;
 128  *      u32     odm_mirror_cnt;
 129  *      u32     odm_raid_algorithm;
 130  * }; // xdr size 4 + 8 + 4 + 4 + 4 + 4
 131  */
 132 static inline int
 133 _osd_data_map_xdr_sz(void)
 134 {
 135         return 4 + 8 + 4 + 4 + 4 + 4;
 136 }
 137
 138 static __be32 *
 139 _osd_xdr_decode_data_map(__be32 *p, struct pnfs_osd_data_map *data_map)
 140 {
 141         data_map->odm_num_comps = be32_to_cpup(p++);
 142         p = xdr_decode_hyper(p, &data_map->odm_stripe_unit);
 143         data_map->odm_group_width = be32_to_cpup(p++);
 144         data_map->odm_group_depth = be32_to_cpup(p++);
 145         data_map->odm_mirror_cnt = be32_to_cpup(p++);
 146         data_map->odm_raid_algorithm = be32_to_cpup(p++);
 147         dprintk("%s: odm_num_comps=%u odm_stripe_unit=%llu odm_group_width=%u "
 148                 "odm_group_depth=%u odm_mirror_cnt=%u odm_raid_algorithm=%u\n",
 149                 __func__,
 150                 data_map->odm_num_comps,
 151                 (unsigned long long)data_map->odm_stripe_unit,
 152                 data_map->odm_group_width,
 153                 data_map->odm_group_depth,
 154                 data_map->odm_mirror_cnt,
 155                 data_map->odm_raid_algorithm);
 156         return p;
 157 }
 158
 159 int pnfs_osd_xdr_decode_layout_map(struct pnfs_osd_layout *layout,
 160         struct pnfs_osd_xdr_decode_layout_iter *iter, struct xdr_stream *xdr)
 161 {
 162         __be32 *p;
 163
 164         memset(iter, 0, sizeof(*iter));
 165
 166         p = xdr_inline_decode(xdr, _osd_data_map_xdr_sz() + 4 + 4);
 167         if (unlikely(!p))
 168                 return -EINVAL;
 169
 170         p = _osd_xdr_decode_data_map(p, &layout->olo_map);
 171         layout->olo_comps_index = be32_to_cpup(p++);
 172         layout->olo_num_comps = be32_to_cpup(p++);
 173         dprintk("%s: olo_comps_index=%d olo_num_comps=%d\n", __func__,
 174                 layout->olo_comps_index, layout->olo_num_comps);
 175
 176         iter->total_comps = layout->olo_num_comps;
 177         return 0;
 178 }
 179
 180 bool pnfs_osd_xdr_decode_layout_comp(struct pnfs_osd_object_cred *comp,
 181         struct pnfs_osd_xdr_decode_layout_iter *iter, struct xdr_stream *xdr,
 182         int *err)
 183 {
 184         BUG_ON(iter->decoded_comps > iter->total_comps);
 185         if (iter->decoded_comps == iter->total_comps)
 186                 return false;
 187
 188         *err = _osd_xdr_decode_object_cred(comp, xdr);
 189         if (unlikely(*err)) {
 190                 dprintk("%s: _osd_xdr_decode_object_cred=>%d decoded_comps=%d "
 191                         "total_comps=%d\n", __func__, *err,
 192                         iter->decoded_comps, iter->total_comps);
 193                 return false; /* stop the loop */
 194         }
 195         dprintk("%s: dev(%llx:%llx) par=0x%llx obj=0x%llx "
 196                 "key_len=%u cap_len=%u\n",
 197                 __func__,
 198                 _DEVID_LO(&comp->oc_object_id.oid_device_id),
 199                 _DEVID_HI(&comp->oc_object_id.oid_device_id),
 200                 comp->oc_object_id.oid_partition_id,
 201                 comp->oc_object_id.oid_object_id,
 202                 comp->oc_cap_key.cred_len, comp->oc_cap.cred_len);
 203
 204         iter->decoded_comps++;
 205         return true;
 206 }
 207
 208 /*
 209  * Get Device Information Decoding
 210  *
 211  * Note: since Device Information is currently done synchronously, all
 212  *       variable strings fields are left inside the rpc buffer and are only
 213  *       pointed to by the pnfs_osd_deviceaddr members. So the read buffer
 214  *       should not be freed while the returned information is in use.
 215  */
 216 /*
 217  *struct nfs4_string {
 218  *      unsigned int len;
 219  *      char *data;
 220  *}; // size [variable]
 221  * NOTE: Returned string points to inside the XDR buffer
 222  */
 223 static __be32 *
 224 __read_u8_opaque(__be32 *p, struct nfs4_string *str)
 225 {
 226         str->len = be32_to_cpup(p++);
 227         str->data = (char *)p;
 228
 229         p += XDR_QUADLEN(str->len);
 230         return p;
 231 }
 232
 233 /*
 234  * struct pnfs_osd_targetid {
 235  *      u32                     oti_type;
 236  *      struct nfs4_string      oti_scsi_device_id;
 237  * };// size 4 + [variable]
 238  */
 239 static __be32 *
 240 __read_targetid(__be32 *p, struct pnfs_osd_targetid* targetid)
 241 {
 242         u32 oti_type;
 243
 244         oti_type = be32_to_cpup(p++);
 245         targetid->oti_type = oti_type;
 246
 247         switch (oti_type) {
 248         case OBJ_TARGET_SCSI_NAME:
 249         case OBJ_TARGET_SCSI_DEVICE_ID:
 250                 p = __read_u8_opaque(p, &targetid->oti_scsi_device_id);
 251         }
 252
 253         return p;
 254 }
 255
 256 /*
 257  * struct pnfs_osd_net_addr {
 258  *      struct nfs4_string      r_netid;
 259  *      struct nfs4_string      r_addr;
 260  * };
 261  */
 262 static __be32 *
 263 __read_net_addr(__be32 *p, struct pnfs_osd_net_addr* netaddr)
 264 {
 265         p = __read_u8_opaque(p, &netaddr->r_netid);
 266         p = __read_u8_opaque(p, &netaddr->r_addr);
 267
 268         return p;
 269 }
 270
 271 /*
 272  * struct pnfs_osd_targetaddr {
 273  *      u32                             ota_available;
 274  *      struct pnfs_osd_net_addr        ota_netaddr;
 275  * };
 276  */
 277 static __be32 *
 278 __read_targetaddr(__be32 *p, struct pnfs_osd_targetaddr *targetaddr)
 279 {
 280         u32 ota_available;
 281
 282         ota_available = be32_to_cpup(p++);
 283         targetaddr->ota_available = ota_available;
 284
 285         if (ota_available)
 286                 p = __read_net_addr(p, &targetaddr->ota_netaddr);
 287
 288
 289         return p;
 290 }
 291
 292 /*
 293  * struct pnfs_osd_deviceaddr {
 294  *      struct pnfs_osd_targetid        oda_targetid;
 295  *      struct pnfs_osd_targetaddr      oda_targetaddr;
 296  *      u8                              oda_lun[8];
 297  *      struct nfs4_string              oda_systemid;
 298  *      struct pnfs_osd_object_cred     oda_root_obj_cred;
 299  *      struct nfs4_string              oda_osdname;
 300  * };
 301  */
 302
 303 /* We need this version for the pnfs_osd_xdr_decode_deviceaddr which does
 304  * not have an xdr_stream
 305  */
 306 static __be32 *
 307 __read_opaque_cred(__be32 *p,
 308                               struct pnfs_osd_opaque_cred *opaque_cred)
 309 {
 310         opaque_cred->cred_len = be32_to_cpu(*p++);
 311         opaque_cred->cred = p;
 312         return p + XDR_QUADLEN(opaque_cred->cred_len);
 313 }
 314
 315 static __be32 *
 316 __read_object_cred(__be32 *p, struct pnfs_osd_object_cred *comp)
 317 {
 318         p = _osd_xdr_decode_objid(p, &comp->oc_object_id);
 319         comp->oc_osd_version = be32_to_cpup(p++);
 320         comp->oc_cap_key_sec = be32_to_cpup(p++);
 321
 322         p = __read_opaque_cred(p, &comp->oc_cap_key);
 323         p = __read_opaque_cred(p, &comp->oc_cap);
 324         return p;
 325 }
 326
 327 void pnfs_osd_xdr_decode_deviceaddr(
 328         struct pnfs_osd_deviceaddr *deviceaddr, __be32 *p)
 329 {
 330         p = __read_targetid(p, &deviceaddr->oda_targetid);
 331
 332         p = __read_targetaddr(p, &deviceaddr->oda_targetaddr);
 333
 334         p = xdr_decode_opaque_fixed(p, deviceaddr->oda_lun,
 335                                     sizeof(deviceaddr->oda_lun));
 336
 337         p = __read_u8_opaque(p, &deviceaddr->oda_systemid);
 338
 339         p = __read_object_cred(p, &deviceaddr->oda_root_obj_cred);
 340
 341         p = __read_u8_opaque(p, &deviceaddr->oda_osdname);
 342
 343         /* libosd likes this terminated in dbg. It's last, so no problems */
 344         deviceaddr->oda_osdname.data[deviceaddr->oda_osdname.len] = 0;
 345 }
 346
 347 /*
 348  * struct pnfs_osd_layoutupdate {
 349  *      u32     dsu_valid;
 350  *      s64     dsu_delta;
 351  *      u32     olu_ioerr_flag;
 352  * }; xdr size 4 + 8 + 4
 353  */
 354 int
 355 pnfs_osd_xdr_encode_layoutupdate(struct xdr_stream *xdr,
 356                                  struct pnfs_osd_layoutupdate *lou)
 357 {
 358         __be32 *p = xdr_reserve_space(xdr,  4 + 8 + 4);
 359
 360         if (!p)
 361                 return -E2BIG;
 362
 363         *p++ = cpu_to_be32(lou->dsu_valid);
 364         if (lou->dsu_valid)
 365                 p = xdr_encode_hyper(p, lou->dsu_delta);
 366         *p++ = cpu_to_be32(lou->olu_ioerr_flag);
 367         return 0;
 368 }
 369
 370 /*
 371  * struct pnfs_osd_objid {
 372  *      struct nfs4_deviceid    oid_device_id;
 373  *      u64                     oid_partition_id;
 374  *      u64                     oid_object_id;
 375  * }; // xdr size 32 bytes
 376  */
 377 static inline __be32 *
 378 pnfs_osd_xdr_encode_objid(__be32 *p, struct pnfs_osd_objid *object_id)
 379 {
 380         p = xdr_encode_opaque_fixed(p, &object_id->oid_device_id.data,
 381                                     sizeof(object_id->oid_device_id.data));
 382         p = xdr_encode_hyper(p, object_id->oid_partition_id);
 383         p = xdr_encode_hyper(p, object_id->oid_object_id);
 384
 385         return p;
 386 }
 387
 388 /*
 389  * struct pnfs_osd_ioerr {
 390  *      struct pnfs_osd_objid   oer_component;
 391  *      u64                     oer_comp_offset;
 392  *      u64                     oer_comp_length;
 393  *      u32                     oer_iswrite;
 394  *      u32                     oer_errno;
 395  * }; // xdr size 32 + 24 bytes
 396  */
 397 void pnfs_osd_xdr_encode_ioerr(__be32 *p, struct pnfs_osd_ioerr *ioerr)
 398 {
 399         p = pnfs_osd_xdr_encode_objid(p, &ioerr->oer_component);
 400         p = xdr_encode_hyper(p, ioerr->oer_comp_offset);
 401         p = xdr_encode_hyper(p, ioerr->oer_comp_length);
 402         *p++ = cpu_to_be32(ioerr->oer_iswrite);
 403         *p   = cpu_to_be32(ioerr->oer_errno);
 404 }
 405
 406 __be32 *pnfs_osd_xdr_ioerr_reserve_space(struct xdr_stream *xdr)
 407 {
 408         __be32 *p;
 409
 410         p = xdr_reserve_space(xdr, 32 + 24);
 411         if (unlikely(!p))
 412                 dprintk("%s: out of xdr space\n", __func__);
 413
 414         return p;
 415 }