SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/scsi/osd/osd_initiator.c

   1 /*
   2  * osd_initiator - Main body of the osd initiator library.
   3  *
   4  * Note: The file does not contain the advanced security functionality which
   5  * is only needed by the security_manager's initiators.
   6  *
   7  * Copyright (C) 2008 Panasas Inc.  All rights reserved.
   8  *
   9  * Authors:
  10  *   Boaz Harrosh <bharrosh@panasas.com>
  11  *   Benny Halevy <bhalevy@panasas.com>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2
  15  *
  16  * Redistribution and use in source and binary forms, with or without
  17  * modification, are permitted provided that the following conditions
  18  * are met:
  19  *
  20  *  1. Redistributions of source code must retain the above copyright
  21  *     notice, this list of conditions and the following disclaimer.
  22  *  2. Redistributions in binary form must reproduce the above copyright
  23  *     notice, this list of conditions and the following disclaimer in the
  24  *     documentation and/or other materials provided with the distribution.
  25  *  3. Neither the name of the Panasas company nor the names of its
  26  *     contributors may be used to endorse or promote products derived
  27  *     from this software without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  30  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  31  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  32  * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  34  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  35  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  36  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  37  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  38  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  39  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40  */
  41
  42 #include <scsi/osd_initiator.h>
  43 #include <scsi/osd_sec.h>
  44 #include <scsi/osd_attributes.h>
  45 #include <scsi/osd_sense.h>
  46
  47 #include <scsi/scsi_device.h>
  48
  49 #include "osd_debug.h"
  50
  51 #ifndef __unused
  52 #    define __unused                    __attribute__((unused))
  53 #endif
  54
  55 enum { OSD_REQ_RETRIES = 1 };
  56
  57 MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>");
  58 MODULE_DESCRIPTION("open-osd initiator library libosd.ko");
  59 MODULE_LICENSE("GPL");
  60
  61 static inline void build_test(void)
  62 {
  63         /* structures were not packed */
  64         BUILD_BUG_ON(sizeof(struct osd_capability) != OSD_CAP_LEN);
  65         BUILD_BUG_ON(sizeof(struct osdv2_cdb) != OSD_TOTAL_CDB_LEN);
  66         BUILD_BUG_ON(sizeof(struct osdv1_cdb) != OSDv1_TOTAL_CDB_LEN);
  67 }
  68
  69 static const char *_osd_ver_desc(struct osd_request *or)
  70 {
  71         return osd_req_is_ver1(or) ? "OSD1" : "OSD2";
  72 }
  73
  74 #define ATTR_DEF_RI(id, len) ATTR_DEF(OSD_APAGE_ROOT_INFORMATION, id, len)
  75
  76 static int _osd_print_system_info(struct osd_dev *od, void *caps)
  77 {
  78         struct osd_request *or;
  79         struct osd_attr get_attrs[] = {
  80                 ATTR_DEF_RI(OSD_ATTR_RI_VENDOR_IDENTIFICATION, 8),
  81                 ATTR_DEF_RI(OSD_ATTR_RI_PRODUCT_IDENTIFICATION, 16),
  82                 ATTR_DEF_RI(OSD_ATTR_RI_PRODUCT_MODEL, 32),
  83                 ATTR_DEF_RI(OSD_ATTR_RI_PRODUCT_REVISION_LEVEL, 4),
  84                 ATTR_DEF_RI(OSD_ATTR_RI_PRODUCT_SERIAL_NUMBER, 64 /*variable*/),
  85                 ATTR_DEF_RI(OSD_ATTR_RI_OSD_NAME, 64 /*variable*/),
  86                 ATTR_DEF_RI(OSD_ATTR_RI_TOTAL_CAPACITY, 8),
  87                 ATTR_DEF_RI(OSD_ATTR_RI_USED_CAPACITY, 8),
  88                 ATTR_DEF_RI(OSD_ATTR_RI_NUMBER_OF_PARTITIONS, 8),
  89                 ATTR_DEF_RI(OSD_ATTR_RI_CLOCK, 6),
  90                 /* IBM-OSD-SIM Has a bug with this one put it last */
  91                 ATTR_DEF_RI(OSD_ATTR_RI_OSD_SYSTEM_ID, 20),
  92         };
  93         void *iter = NULL, *pFirst;
  94         int nelem = ARRAY_SIZE(get_attrs), a = 0;
  95         int ret;
  96
  97         or = osd_start_request(od, GFP_KERNEL);
  98         if (!or)
  99                 return -ENOMEM;
 100
 101         /* get attrs */
 102         osd_req_get_attributes(or, &osd_root_object);
 103         osd_req_add_get_attr_list(or, get_attrs, ARRAY_SIZE(get_attrs));
 104
 105         ret = osd_finalize_request(or, 0, caps, NULL);
 106         if (ret)
 107                 goto out;
 108
 109         ret = osd_execute_request(or);
 110         if (ret) {
 111                 OSD_ERR("Failed to detect %s => %d\n", _osd_ver_desc(or), ret);
 112                 goto out;
 113         }
 114
 115         osd_req_decode_get_attr_list(or, get_attrs, &nelem, &iter);
 116
 117         OSD_INFO("Detected %s device\n",
 118                 _osd_ver_desc(or));
 119
 120         pFirst = get_attrs[a++].val_ptr;
 121         OSD_INFO("VENDOR_IDENTIFICATION  [%s]\n",
 122                 (char *)pFirst);
 123
 124         pFirst = get_attrs[a++].val_ptr;
 125         OSD_INFO("PRODUCT_IDENTIFICATION [%s]\n",
 126                 (char *)pFirst);
 127
 128         pFirst = get_attrs[a++].val_ptr;
 129         OSD_INFO("PRODUCT_MODEL          [%s]\n",
 130                 (char *)pFirst);
 131
 132         pFirst = get_attrs[a++].val_ptr;
 133         OSD_INFO("PRODUCT_REVISION_LEVEL [%u]\n",
 134                 pFirst ? get_unaligned_be32(pFirst) : ~0U);
 135
 136         pFirst = get_attrs[a++].val_ptr;
 137         OSD_INFO("PRODUCT_SERIAL_NUMBER  [%s]\n",
 138                 (char *)pFirst);
 139
 140         pFirst = get_attrs[a].val_ptr;
 141         OSD_INFO("OSD_NAME               [%s]\n", (char *)pFirst);
 142         a++;
 143
 144         pFirst = get_attrs[a++].val_ptr;
 145         OSD_INFO("TOTAL_CAPACITY         [0x%llx]\n",
 146                 pFirst ? _LLU(get_unaligned_be64(pFirst)) : ~0ULL);
 147
 148         pFirst = get_attrs[a++].val_ptr;
 149         OSD_INFO("USED_CAPACITY          [0x%llx]\n",
 150                 pFirst ? _LLU(get_unaligned_be64(pFirst)) : ~0ULL);
 151
 152         pFirst = get_attrs[a++].val_ptr;
 153         OSD_INFO("NUMBER_OF_PARTITIONS   [%llu]\n",
 154                 pFirst ? _LLU(get_unaligned_be64(pFirst)) : ~0ULL);
 155
 156         if (a >= nelem)
 157                 goto out;
 158
 159         /* FIXME: Where are the time utilities */
 160         pFirst = get_attrs[a++].val_ptr;
 161         OSD_INFO("CLOCK                  [0x%02x%02x%02x%02x%02x%02x]\n",
 162                 ((char *)pFirst)[0], ((char *)pFirst)[1],
 163                 ((char *)pFirst)[2], ((char *)pFirst)[3],
 164                 ((char *)pFirst)[4], ((char *)pFirst)[5]);
 165
 166         if (a < nelem) { /* IBM-OSD-SIM bug, Might not have it */
 167                 unsigned len = get_attrs[a].len;
 168                 char sid_dump[32*4 + 2]; /* 2nibbles+space+ASCII */
 169
 170                 hex_dump_to_buffer(get_attrs[a].val_ptr, len, 32, 1,
 171                                    sid_dump, sizeof(sid_dump), true);
 172                 OSD_INFO("OSD_SYSTEM_ID(%d)\n"
 173                          "        [%s]\n", len, sid_dump);
 174                 a++;
 175         }
 176 out:
 177         osd_end_request(or);
 178         return ret;
 179 }
 180
 181 int osd_auto_detect_ver(struct osd_dev *od, void *caps)
 182 {
 183         int ret;
 184
 185         /* Auto-detect the osd version */
 186         ret = _osd_print_system_info(od, caps);
 187         if (ret) {
 188                 osd_dev_set_ver(od, OSD_VER1);
 189                 OSD_DEBUG("converting to OSD1\n");
 190                 ret = _osd_print_system_info(od, caps);
 191         }
 192
 193         return ret;
 194 }
 195 EXPORT_SYMBOL(osd_auto_detect_ver);
 196
 197 static unsigned _osd_req_cdb_len(struct osd_request *or)
 198 {
 199         return osd_req_is_ver1(or) ? OSDv1_TOTAL_CDB_LEN : OSD_TOTAL_CDB_LEN;
 200 }
 201
 202 static unsigned _osd_req_alist_elem_size(struct osd_request *or, unsigned len)
 203 {
 204         return osd_req_is_ver1(or) ?
 205                 osdv1_attr_list_elem_size(len) :
 206                 osdv2_attr_list_elem_size(len);
 207 }
 208
 209 static void _osd_req_alist_elem_encode(struct osd_request *or,
 210         void *attr_last, const struct osd_attr *oa)
 211 {
 212         if (osd_req_is_ver1(or)) {
 213                 struct osdv1_attributes_list_element *attr = attr_last;
 214
 215                 attr->attr_page = cpu_to_be32(oa->attr_page);
 216                 attr->attr_id = cpu_to_be32(oa->attr_id);
 217                 attr->attr_bytes = cpu_to_be16(oa->len);
 218                 memcpy(attr->attr_val, oa->val_ptr, oa->len);
 219         } else {
 220                 struct osdv2_attributes_list_element *attr = attr_last;
 221
 222                 attr->attr_page = cpu_to_be32(oa->attr_page);
 223                 attr->attr_id = cpu_to_be32(oa->attr_id);
 224                 attr->attr_bytes = cpu_to_be16(oa->len);
 225                 memcpy(attr->attr_val, oa->val_ptr, oa->len);
 226         }
 227 }
 228
 229 static int _osd_req_alist_elem_decode(struct osd_request *or,
 230         void *cur_p, struct osd_attr *oa, unsigned max_bytes)
 231 {
 232         unsigned inc;
 233         if (osd_req_is_ver1(or)) {
 234                 struct osdv1_attributes_list_element *attr = cur_p;
 235
 236                 if (max_bytes < sizeof(*attr))
 237                         return -1;
 238
 239                 oa->len = be16_to_cpu(attr->attr_bytes);
 240                 inc = _osd_req_alist_elem_size(or, oa->len);
 241                 if (inc > max_bytes)
 242                         return -1;
 243
 244                 oa->attr_page = be32_to_cpu(attr->attr_page);
 245                 oa->attr_id = be32_to_cpu(attr->attr_id);
 246
 247                 /* OSD1: On empty attributes we return a pointer to 2 bytes
 248                  * of zeros. This keeps similar behaviour with OSD2.
 249                  * (See below)
 250                  */
 251                 oa->val_ptr = likely(oa->len) ? attr->attr_val :
 252                                                 (u8 *)&attr->attr_bytes;
 253         } else {
 254                 struct osdv2_attributes_list_element *attr = cur_p;
 255
 256                 if (max_bytes < sizeof(*attr))
 257                         return -1;
 258
 259                 oa->len = be16_to_cpu(attr->attr_bytes);
 260                 inc = _osd_req_alist_elem_size(or, oa->len);
 261                 if (inc > max_bytes)
 262                         return -1;
 263
 264                 oa->attr_page = be32_to_cpu(attr->attr_page);
 265                 oa->attr_id = be32_to_cpu(attr->attr_id);
 266
 267                 /* OSD2: For convenience, on empty attributes, we return 8 bytes
 268                  * of zeros here. This keeps the same behaviour with OSD2r04,
 269                  * and is nice with null terminating ASCII fields.
 270                  * oa->val_ptr == NULL marks the end-of-list, or error.
 271                  */
 272                 oa->val_ptr = likely(oa->len) ? attr->attr_val : attr->reserved;
 273         }
 274         return inc;
 275 }
 276
 277 static unsigned _osd_req_alist_size(struct osd_request *or, void *list_head)
 278 {
 279         return osd_req_is_ver1(or) ?
 280                 osdv1_list_size(list_head) :
 281                 osdv2_list_size(list_head);
 282 }
 283
 284 static unsigned _osd_req_sizeof_alist_header(struct osd_request *or)
 285 {
 286         return osd_req_is_ver1(or) ?
 287                 sizeof(struct osdv1_attributes_list_header) :
 288                 sizeof(struct osdv2_attributes_list_header);
 289 }
 290
 291 static void _osd_req_set_alist_type(struct osd_request *or,
 292         void *list, int list_type)
 293 {
 294         if (osd_req_is_ver1(or)) {
 295                 struct osdv1_attributes_list_header *attr_list = list;
 296
 297                 memset(attr_list, 0, sizeof(*attr_list));
 298                 attr_list->type = list_type;
 299         } else {
 300                 struct osdv2_attributes_list_header *attr_list = list;
 301
 302                 memset(attr_list, 0, sizeof(*attr_list));
 303                 attr_list->type = list_type;
 304         }
 305 }
 306
 307 static bool _osd_req_is_alist_type(struct osd_request *or,
 308         void *list, int list_type)
 309 {
 310         if (!list)
 311                 return false;
 312
 313         if (osd_req_is_ver1(or)) {
 314                 struct osdv1_attributes_list_header *attr_list = list;
 315
 316                 return attr_list->type == list_type;
 317         } else {
 318                 struct osdv2_attributes_list_header *attr_list = list;
 319
 320                 return attr_list->type == list_type;
 321         }
 322 }
 323
 324 /* This is for List-objects not Attributes-Lists */
 325 static void _osd_req_encode_olist(struct osd_request *or,
 326         struct osd_obj_id_list *list)
 327 {
 328         struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb);
 329
 330         if (osd_req_is_ver1(or)) {
 331                 cdbh->v1.list_identifier = list->list_identifier;
 332                 cdbh->v1.start_address = list->continuation_id;
 333         } else {
 334                 cdbh->v2.list_identifier = list->list_identifier;
 335                 cdbh->v2.start_address = list->continuation_id;
 336         }
 337 }
 338
 339 static osd_cdb_offset osd_req_encode_offset(struct osd_request *or,
 340         u64 offset, unsigned *padding)
 341 {
 342         return __osd_encode_offset(offset, padding,
 343                         osd_req_is_ver1(or) ?
 344                                 OSDv1_OFFSET_MIN_SHIFT : OSD_OFFSET_MIN_SHIFT,
 345                         OSD_OFFSET_MAX_SHIFT);
 346 }
 347
 348 static struct osd_security_parameters *
 349 _osd_req_sec_params(struct osd_request *or)
 350 {
 351         struct osd_cdb *ocdb = &or->cdb;
 352
 353         if (osd_req_is_ver1(or))
 354                 return (struct osd_security_parameters *)&ocdb->v1.sec_params;
 355         else
 356                 return (struct osd_security_parameters *)&ocdb->v2.sec_params;
 357 }
 358
 359 void osd_dev_init(struct osd_dev *osdd, struct scsi_device *scsi_device)
 360 {
 361         memset(osdd, 0, sizeof(*osdd));
 362         osdd->scsi_device = scsi_device;
 363         osdd->def_timeout = BLK_DEFAULT_SG_TIMEOUT;
 364 #ifdef OSD_VER1_SUPPORT
 365         osdd->version = OSD_VER2;
 366 #endif
 367         /* TODO: Allocate pools for osd_request attributes ... */
 368 }
 369 EXPORT_SYMBOL(osd_dev_init);
 370
 371 void osd_dev_fini(struct osd_dev *osdd)
 372 {
 373         /* TODO: De-allocate pools */
 374
 375         osdd->scsi_device = NULL;
 376 }
 377 EXPORT_SYMBOL(osd_dev_fini);
 378
 379 static struct osd_request *_osd_request_alloc(gfp_t gfp)
 380 {
 381         struct osd_request *or;
 382
 383         /* TODO: Use mempool with one saved request */
 384         or = kzalloc(sizeof(*or), gfp);
 385         return or;
 386 }
 387
 388 static void _osd_request_free(struct osd_request *or)
 389 {
 390         kfree(or);
 391 }
 392
 393 struct osd_request *osd_start_request(struct osd_dev *dev, gfp_t gfp)
 394 {
 395         struct osd_request *or;
 396
 397         or = _osd_request_alloc(gfp);
 398         if (!or)
 399                 return NULL;
 400
 401         or->osd_dev = dev;
 402         or->alloc_flags = gfp;
 403         or->timeout = dev->def_timeout;
 404         or->retries = OSD_REQ_RETRIES;
 405
 406         return or;
 407 }
 408 EXPORT_SYMBOL(osd_start_request);
 409
 410 static void _osd_free_seg(struct osd_request *or __unused,
 411         struct _osd_req_data_segment *seg)
 412 {
 413         if (!seg->buff || !seg->alloc_size)
 414                 return;
 415
 416         kfree(seg->buff);
 417         seg->buff = NULL;
 418         seg->alloc_size = 0;
 419 }
 420
 421 static void _put_request(struct request *rq , bool is_async)
 422 {
 423         if (is_async) {
 424                 WARN_ON(rq->bio);
 425                 __blk_put_request(rq->q, rq);
 426         } else {
 427                 /*
 428                  * If osd_finalize_request() was called but the request was not
 429                  * executed through the block layer, then we must release BIOs.
 430                  * TODO: Keep error code in or->async_error. Need to audit all
 431                  *       code paths.
 432                  */
 433                 if (unlikely(rq->bio))
 434                         blk_end_request(rq, -ENOMEM, blk_rq_bytes(rq));
 435                 else
 436                         blk_put_request(rq);
 437         }
 438 }
 439
 440 void osd_end_request(struct osd_request *or)
 441 {
 442         struct request *rq = or->request;
 443         /* IMPORTANT: make sure this agrees with osd_execute_request_async */
 444         bool is_async = (or->request->end_io_data == or);
 445
 446         _osd_free_seg(or, &or->set_attr);
 447         _osd_free_seg(or, &or->enc_get_attr);
 448         _osd_free_seg(or, &or->get_attr);
 449
 450         if (rq) {
 451                 if (rq->next_rq) {
 452                         _put_request(rq->next_rq, is_async);
 453                         rq->next_rq = NULL;
 454                 }
 455
 456                 _put_request(rq, is_async);
 457         }
 458         _osd_request_free(or);
 459 }
 460 EXPORT_SYMBOL(osd_end_request);
 461
 462 int osd_execute_request(struct osd_request *or)
 463 {
 464         return blk_execute_rq(or->request->q, NULL, or->request, 0);
 465 }
 466 EXPORT_SYMBOL(osd_execute_request);
 467
 468 static void osd_request_async_done(struct request *req, int error)
 469 {
 470         struct osd_request *or = req->end_io_data;
 471
 472         or->async_error = error;
 473
 474         if (error)
 475                 OSD_DEBUG("osd_request_async_done error recieved %d\n", error);
 476
 477         if (or->async_done)
 478                 or->async_done(or, or->async_private);
 479         else
 480                 osd_end_request(or);
 481 }
 482
 483 int osd_execute_request_async(struct osd_request *or,
 484         osd_req_done_fn *done, void *private)
 485 {
 486         or->request->end_io_data = or;
 487         or->async_private = private;
 488         or->async_done = done;
 489
 490         blk_execute_rq_nowait(or->request->q, NULL, or->request, 0,
 491                               osd_request_async_done);
 492         return 0;
 493 }
 494 EXPORT_SYMBOL(osd_execute_request_async);
 495
 496 u8 sg_out_pad_buffer[1 << OSDv1_OFFSET_MIN_SHIFT];
 497 u8 sg_in_pad_buffer[1 << OSDv1_OFFSET_MIN_SHIFT];
 498
 499 static int _osd_realloc_seg(struct osd_request *or,
 500         struct _osd_req_data_segment *seg, unsigned max_bytes)
 501 {
 502         void *buff;
 503
 504         if (seg->alloc_size >= max_bytes)
 505                 return 0;
 506
 507         buff = krealloc(seg->buff, max_bytes, or->alloc_flags);
 508         if (!buff) {
 509                 OSD_ERR("Failed to Realloc %d-bytes was-%d\n", max_bytes,
 510                         seg->alloc_size);
 511                 return -ENOMEM;
 512         }
 513
 514         memset(buff + seg->alloc_size, 0, max_bytes - seg->alloc_size);
 515         seg->buff = buff;
 516         seg->alloc_size = max_bytes;
 517         return 0;
 518 }
 519
 520 static int _alloc_set_attr_list(struct osd_request *or,
 521         const struct osd_attr *oa, unsigned nelem, unsigned add_bytes)
 522 {
 523         unsigned total_bytes = add_bytes;
 524
 525         for (; nelem; --nelem, ++oa)
 526                 total_bytes += _osd_req_alist_elem_size(or, oa->len);
 527
 528         OSD_DEBUG("total_bytes=%d\n", total_bytes);
 529         return _osd_realloc_seg(or, &or->set_attr, total_bytes);
 530 }
 531
 532 static int _alloc_get_attr_desc(struct osd_request *or, unsigned max_bytes)
 533 {
 534         OSD_DEBUG("total_bytes=%d\n", max_bytes);
 535         return _osd_realloc_seg(or, &or->enc_get_attr, max_bytes);
 536 }
 537
 538 static int _alloc_get_attr_list(struct osd_request *or)
 539 {
 540         OSD_DEBUG("total_bytes=%d\n", or->get_attr.total_bytes);
 541         return _osd_realloc_seg(or, &or->get_attr, or->get_attr.total_bytes);
 542 }
 543
 544 /*
 545  * Common to all OSD commands
 546  */
 547
 548 static void _osdv1_req_encode_common(struct osd_request *or,
 549         __be16 act, const struct osd_obj_id *obj, u64 offset, u64 len)
 550 {
 551         struct osdv1_cdb *ocdb = &or->cdb.v1;
 552
 553         /*
 554          * For speed, the commands
 555          *      OSD_ACT_PERFORM_SCSI_COMMAND    , V1 0x8F7E, V2 0x8F7C
 556          *      OSD_ACT_SCSI_TASK_MANAGEMENT    , V1 0x8F7F, V2 0x8F7D
 557          * are not supported here. Should pass zero and set after the call
 558          */
 559         act &= cpu_to_be16(~0x0080); /* V1 action code */
 560
 561         OSD_DEBUG("OSDv1 execute opcode 0x%x\n", be16_to_cpu(act));
 562
 563         ocdb->h.varlen_cdb.opcode = VARIABLE_LENGTH_CMD;
 564         ocdb->h.varlen_cdb.additional_cdb_length = OSD_ADDITIONAL_CDB_LENGTH;
 565         ocdb->h.varlen_cdb.service_action = act;
 566
 567         ocdb->h.partition = cpu_to_be64(obj->partition);
 568         ocdb->h.object = cpu_to_be64(obj->id);
 569         ocdb->h.v1.length = cpu_to_be64(len);
 570         ocdb->h.v1.start_address = cpu_to_be64(offset);
 571 }
 572
 573 static void _osdv2_req_encode_common(struct osd_request *or,
 574          __be16 act, const struct osd_obj_id *obj, u64 offset, u64 len)
 575 {
 576         struct osdv2_cdb *ocdb = &or->cdb.v2;
 577
 578         OSD_DEBUG("OSDv2 execute opcode 0x%x\n", be16_to_cpu(act));
 579
 580         ocdb->h.varlen_cdb.opcode = VARIABLE_LENGTH_CMD;
 581         ocdb->h.varlen_cdb.additional_cdb_length = OSD_ADDITIONAL_CDB_LENGTH;
 582         ocdb->h.varlen_cdb.service_action = act;
 583
 584         ocdb->h.partition = cpu_to_be64(obj->partition);
 585         ocdb->h.object = cpu_to_be64(obj->id);
 586         ocdb->h.v2.length = cpu_to_be64(len);
 587         ocdb->h.v2.start_address = cpu_to_be64(offset);
 588 }
 589
 590 static void _osd_req_encode_common(struct osd_request *or,
 591         __be16 act, const struct osd_obj_id *obj, u64 offset, u64 len)
 592 {
 593         if (osd_req_is_ver1(or))
 594                 _osdv1_req_encode_common(or, act, obj, offset, len);
 595         else
 596                 _osdv2_req_encode_common(or, act, obj, offset, len);
 597 }
 598
 599 /*
 600  * Device commands
 601  */
 602 /*TODO: void osd_req_set_master_seed_xchg(struct osd_request *, ...); */
 603 /*TODO: void osd_req_set_master_key(struct osd_request *, ...); */
 604
 605 void osd_req_format(struct osd_request *or, u64 tot_capacity)
 606 {
 607         _osd_req_encode_common(or, OSD_ACT_FORMAT_OSD, &osd_root_object, 0,
 608                                 tot_capacity);
 609 }
 610 EXPORT_SYMBOL(osd_req_format);
 611
 612 int osd_req_list_dev_partitions(struct osd_request *or,
 613         osd_id initial_id, struct osd_obj_id_list *list, unsigned nelem)
 614 {
 615         return osd_req_list_partition_objects(or, 0, initial_id, list, nelem);
 616 }
 617 EXPORT_SYMBOL(osd_req_list_dev_partitions);
 618
 619 static void _osd_req_encode_flush(struct osd_request *or,
 620         enum osd_options_flush_scope_values op)
 621 {
 622         struct osd_cdb_head *ocdb = osd_cdb_head(&or->cdb);
 623
 624         ocdb->command_specific_options = op;
 625 }
 626
 627 void osd_req_flush_obsd(struct osd_request *or,
 628         enum osd_options_flush_scope_values op)
 629 {
 630         _osd_req_encode_common(or, OSD_ACT_FLUSH_OSD, &osd_root_object, 0, 0);
 631         _osd_req_encode_flush(or, op);
 632 }
 633 EXPORT_SYMBOL(osd_req_flush_obsd);
 634
 635 /*TODO: void osd_req_perform_scsi_command(struct osd_request *,
 636         const u8 *cdb, ...); */
 637 /*TODO: void osd_req_task_management(struct osd_request *, ...); */
 638
 639 /*
 640  * Partition commands
 641  */
 642 static void _osd_req_encode_partition(struct osd_request *or,
 643         __be16 act, osd_id partition)
 644 {
 645         struct osd_obj_id par = {
 646                 .partition = partition,
 647                 .id = 0,
 648         };
 649
 650         _osd_req_encode_common(or, act, &par, 0, 0);
 651 }
 652
 653 void osd_req_create_partition(struct osd_request *or, osd_id partition)
 654 {
 655         _osd_req_encode_partition(or, OSD_ACT_CREATE_PARTITION, partition);
 656 }
 657 EXPORT_SYMBOL(osd_req_create_partition);
 658
 659 void osd_req_remove_partition(struct osd_request *or, osd_id partition)
 660 {
 661         _osd_req_encode_partition(or, OSD_ACT_REMOVE_PARTITION, partition);
 662 }
 663 EXPORT_SYMBOL(osd_req_remove_partition);
 664
 665 /*TODO: void osd_req_set_partition_key(struct osd_request *,
 666         osd_id partition, u8 new_key_id[OSD_CRYPTO_KEYID_SIZE],
 667         u8 seed[OSD_CRYPTO_SEED_SIZE]); */
 668
 669 static int _osd_req_list_objects(struct osd_request *or,
 670         __be16 action, const struct osd_obj_id *obj, osd_id initial_id,
 671         struct osd_obj_id_list *list, unsigned nelem)
 672 {
 673         struct request_queue *q = or->osd_dev->scsi_device->request_queue;
 674         u64 len = nelem * sizeof(osd_id) + sizeof(*list);
 675         struct bio *bio;
 676
 677         _osd_req_encode_common(or, action, obj, (u64)initial_id, len);
 678
 679         if (list->list_identifier)
 680                 _osd_req_encode_olist(or, list);
 681
 682         WARN_ON(or->in.bio);
 683         bio = bio_map_kern(q, list, len, or->alloc_flags);
 684         if (IS_ERR(bio)) {
 685                 OSD_ERR("!!! Failed to allocate list_objects BIO\n");
 686                 return PTR_ERR(bio);
 687         }
 688
 689         bio->bi_rw &= ~(1 << BIO_RW);
 690         or->in.bio = bio;
 691         or->in.total_bytes = bio->bi_size;
 692         return 0;
 693 }
 694
 695 int osd_req_list_partition_collections(struct osd_request *or,
 696         osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
 697         unsigned nelem)
 698 {
 699         struct osd_obj_id par = {
 700                 .partition = partition,
 701                 .id = 0,
 702         };
 703
 704         return osd_req_list_collection_objects(or, &par, initial_id, list,
 705                                                nelem);
 706 }
 707 EXPORT_SYMBOL(osd_req_list_partition_collections);
 708
 709 int osd_req_list_partition_objects(struct osd_request *or,
 710         osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
 711         unsigned nelem)
 712 {
 713         struct osd_obj_id par = {
 714                 .partition = partition,
 715                 .id = 0,
 716         };
 717
 718         return _osd_req_list_objects(or, OSD_ACT_LIST, &par, initial_id, list,
 719                                      nelem);
 720 }
 721 EXPORT_SYMBOL(osd_req_list_partition_objects);
 722
 723 void osd_req_flush_partition(struct osd_request *or,
 724         osd_id partition, enum osd_options_flush_scope_values op)
 725 {
 726         _osd_req_encode_partition(or, OSD_ACT_FLUSH_PARTITION, partition);
 727         _osd_req_encode_flush(or, op);
 728 }
 729 EXPORT_SYMBOL(osd_req_flush_partition);
 730
 731 /*
 732  * Collection commands
 733  */
 734 /*TODO: void osd_req_create_collection(struct osd_request *,
 735         const struct osd_obj_id *); */
 736 /*TODO: void osd_req_remove_collection(struct osd_request *,
 737         const struct osd_obj_id *); */
 738
 739 int osd_req_list_collection_objects(struct osd_request *or,
 740         const struct osd_obj_id *obj, osd_id initial_id,
 741         struct osd_obj_id_list *list, unsigned nelem)
 742 {
 743         return _osd_req_list_objects(or, OSD_ACT_LIST_COLLECTION, obj,
 744                                      initial_id, list, nelem);
 745 }
 746 EXPORT_SYMBOL(osd_req_list_collection_objects);
 747
 748 /*TODO: void query(struct osd_request *, ...); V2 */
 749
 750 void osd_req_flush_collection(struct osd_request *or,
 751         const struct osd_obj_id *obj, enum osd_options_flush_scope_values op)
 752 {
 753         _osd_req_encode_common(or, OSD_ACT_FLUSH_PARTITION, obj, 0, 0);
 754         _osd_req_encode_flush(or, op);
 755 }
 756 EXPORT_SYMBOL(osd_req_flush_collection);
 757
 758 /*TODO: void get_member_attrs(struct osd_request *, ...); V2 */
 759 /*TODO: void set_member_attrs(struct osd_request *, ...); V2 */
 760
 761 /*
 762  * Object commands
 763  */
 764 void osd_req_create_object(struct osd_request *or, struct osd_obj_id *obj)
 765 {
 766         _osd_req_encode_common(or, OSD_ACT_CREATE, obj, 0, 0);
 767 }
 768 EXPORT_SYMBOL(osd_req_create_object);
 769
 770 void osd_req_remove_object(struct osd_request *or, struct osd_obj_id *obj)
 771 {
 772         _osd_req_encode_common(or, OSD_ACT_REMOVE, obj, 0, 0);
 773 }
 774 EXPORT_SYMBOL(osd_req_remove_object);
 775
 776
 777 /*TODO: void osd_req_create_multi(struct osd_request *or,
 778         struct osd_obj_id *first, struct osd_obj_id_list *list, unsigned nelem);
 779 */
 780
 781 void osd_req_write(struct osd_request *or,
 782         const struct osd_obj_id *obj, struct bio *bio, u64 offset)
 783 {
 784         _osd_req_encode_common(or, OSD_ACT_WRITE, obj, offset, bio->bi_size);
 785         WARN_ON(or->out.bio || or->out.total_bytes);
 786         bio->bi_rw |= (1 << BIO_RW);
 787         or->out.bio = bio;
 788         or->out.total_bytes = bio->bi_size;
 789 }
 790 EXPORT_SYMBOL(osd_req_write);
 791
 792 int osd_req_write_kern(struct osd_request *or,
 793         const struct osd_obj_id *obj, u64 offset, void* buff, u64 len)
 794 {
 795         struct request_queue *req_q = or->osd_dev->scsi_device->request_queue;
 796         struct bio *bio = bio_map_kern(req_q, buff, len, GFP_KERNEL);
 797
 798         if (IS_ERR(bio))
 799                 return PTR_ERR(bio);
 800
 801         osd_req_write(or, obj, bio, offset);
 802         return 0;
 803 }
 804 EXPORT_SYMBOL(osd_req_write_kern);
 805
 806 /*TODO: void osd_req_append(struct osd_request *,
 807         const struct osd_obj_id *, struct bio *data_out); */
 808 /*TODO: void osd_req_create_write(struct osd_request *,
 809         const struct osd_obj_id *, struct bio *data_out, u64 offset); */
 810 /*TODO: void osd_req_clear(struct osd_request *,
 811         const struct osd_obj_id *, u64 offset, u64 len); */
 812 /*TODO: void osd_req_punch(struct osd_request *,
 813         const struct osd_obj_id *, u64 offset, u64 len); V2 */
 814
 815 void osd_req_flush_object(struct osd_request *or,
 816         const struct osd_obj_id *obj, enum osd_options_flush_scope_values op,
 817         /*V2*/ u64 offset, /*V2*/ u64 len)
 818 {
 819         if (unlikely(osd_req_is_ver1(or) && (offset || len))) {
 820                 OSD_DEBUG("OSD Ver1 flush on specific range ignored\n");
 821                 offset = 0;
 822                 len = 0;
 823         }
 824
 825         _osd_req_encode_common(or, OSD_ACT_FLUSH, obj, offset, len);
 826         _osd_req_encode_flush(or, op);
 827 }
 828 EXPORT_SYMBOL(osd_req_flush_object);
 829
 830 void osd_req_read(struct osd_request *or,
 831         const struct osd_obj_id *obj, struct bio *bio, u64 offset)
 832 {
 833         _osd_req_encode_common(or, OSD_ACT_READ, obj, offset, bio->bi_size);
 834         WARN_ON(or->in.bio || or->in.total_bytes);
 835         bio->bi_rw &= ~(1 << BIO_RW);
 836         or->in.bio = bio;
 837         or->in.total_bytes = bio->bi_size;
 838 }
 839 EXPORT_SYMBOL(osd_req_read);
 840
 841 int osd_req_read_kern(struct osd_request *or,
 842         const struct osd_obj_id *obj, u64 offset, void* buff, u64 len)
 843 {
 844         struct request_queue *req_q = or->osd_dev->scsi_device->request_queue;
 845         struct bio *bio = bio_map_kern(req_q, buff, len, GFP_KERNEL);
 846
 847         if (IS_ERR(bio))
 848                 return PTR_ERR(bio);
 849
 850         osd_req_read(or, obj, bio, offset);
 851         return 0;
 852 }
 853 EXPORT_SYMBOL(osd_req_read_kern);
 854
 855 void osd_req_get_attributes(struct osd_request *or,
 856         const struct osd_obj_id *obj)
 857 {
 858         _osd_req_encode_common(or, OSD_ACT_GET_ATTRIBUTES, obj, 0, 0);
 859 }
 860 EXPORT_SYMBOL(osd_req_get_attributes);
 861
 862 void osd_req_set_attributes(struct osd_request *or,
 863         const struct osd_obj_id *obj)
 864 {
 865         _osd_req_encode_common(or, OSD_ACT_SET_ATTRIBUTES, obj, 0, 0);
 866 }
 867 EXPORT_SYMBOL(osd_req_set_attributes);
 868
 869 /*
 870  * Attributes List-mode
 871  */
 872
 873 int osd_req_add_set_attr_list(struct osd_request *or,
 874         const struct osd_attr *oa, unsigned nelem)
 875 {
 876         unsigned total_bytes = or->set_attr.total_bytes;
 877         void *attr_last;
 878         int ret;
 879
 880         if (or->attributes_mode &&
 881             or->attributes_mode != OSD_CDB_GET_SET_ATTR_LISTS) {
 882                 WARN_ON(1);
 883                 return -EINVAL;
 884         }
 885         or->attributes_mode = OSD_CDB_GET_SET_ATTR_LISTS;
 886
 887         if (!total_bytes) { /* first-time: allocate and put list header */
 888                 total_bytes = _osd_req_sizeof_alist_header(or);
 889                 ret = _alloc_set_attr_list(or, oa, nelem, total_bytes);
 890                 if (ret)
 891                         return ret;
 892                 _osd_req_set_alist_type(or, or->set_attr.buff,
 893                                         OSD_ATTR_LIST_SET_RETRIEVE);
 894         }
 895         attr_last = or->set_attr.buff + total_bytes;
 896
 897         for (; nelem; --nelem) {
 898                 unsigned elem_size = _osd_req_alist_elem_size(or, oa->len);
 899
 900                 total_bytes += elem_size;
 901                 if (unlikely(or->set_attr.alloc_size < total_bytes)) {
 902                         or->set_attr.total_bytes = total_bytes - elem_size;
 903                         ret = _alloc_set_attr_list(or, oa, nelem, total_bytes);
 904                         if (ret)
 905                                 return ret;
 906                         attr_last =
 907                                 or->set_attr.buff + or->set_attr.total_bytes;
 908                 }
 909
 910                 _osd_req_alist_elem_encode(or, attr_last, oa);
 911
 912                 attr_last += elem_size;
 913                 ++oa;
 914         }
 915
 916         or->set_attr.total_bytes = total_bytes;
 917         return 0;
 918 }
 919 EXPORT_SYMBOL(osd_req_add_set_attr_list);
 920
 921 static int _append_map_kern(struct request *req,
 922         void *buff, unsigned len, gfp_t flags)
 923 {
 924         struct bio *bio;
 925         int ret;
 926
 927         bio = bio_map_kern(req->q, buff, len, flags);
 928         if (IS_ERR(bio)) {
 929                 OSD_ERR("Failed bio_map_kern(%p, %d) => %ld\n", buff, len,
 930                         PTR_ERR(bio));
 931                 return PTR_ERR(bio);
 932         }
 933         ret = blk_rq_append_bio(req->q, req, bio);
 934         if (ret) {
 935                 OSD_ERR("Failed blk_rq_append_bio(%p) => %d\n", bio, ret);
 936                 bio_put(bio);
 937         }
 938         return ret;
 939 }
 940
 941 static int _req_append_segment(struct osd_request *or,
 942         unsigned padding, struct _osd_req_data_segment *seg,
 943         struct _osd_req_data_segment *last_seg, struct _osd_io_info *io)
 944 {
 945         void *pad_buff;
 946         int ret;
 947
 948         if (padding) {
 949                 /* check if we can just add it to last buffer */
 950                 if (last_seg &&
 951                     (padding <= last_seg->alloc_size - last_seg->total_bytes))
 952                         pad_buff = last_seg->buff + last_seg->total_bytes;
 953                 else
 954                         pad_buff = io->pad_buff;
 955
 956                 ret = _append_map_kern(io->req, pad_buff, padding,
 957                                        or->alloc_flags);
 958                 if (ret)
 959                         return ret;
 960                 io->total_bytes += padding;
 961         }
 962
 963         ret = _append_map_kern(io->req, seg->buff, seg->total_bytes,
 964                                or->alloc_flags);
 965         if (ret)
 966                 return ret;
 967
 968         io->total_bytes += seg->total_bytes;
 969         OSD_DEBUG("padding=%d buff=%p total_bytes=%d\n", padding, seg->buff,
 970                   seg->total_bytes);
 971         return 0;
 972 }
 973
 974 static int _osd_req_finalize_set_attr_list(struct osd_request *or)
 975 {
 976         struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb);
 977         unsigned padding;
 978         int ret;
 979
 980         if (!or->set_attr.total_bytes) {
 981                 cdbh->attrs_list.set_attr_offset = OSD_OFFSET_UNUSED;
 982                 return 0;
 983         }
 984
 985         cdbh->attrs_list.set_attr_bytes = cpu_to_be32(or->set_attr.total_bytes);
 986         cdbh->attrs_list.set_attr_offset =
 987                 osd_req_encode_offset(or, or->out.total_bytes, &padding);
 988
 989         ret = _req_append_segment(or, padding, &or->set_attr,
 990                                   or->out.last_seg, &or->out);
 991         if (ret)
 992                 return ret;
 993
 994         or->out.last_seg = &or->set_attr;
 995         return 0;
 996 }
 997
 998 int osd_req_add_get_attr_list(struct osd_request *or,
 999         const struct osd_attr *oa, unsigned nelem)
1000 {
1001         unsigned total_bytes = or->enc_get_attr.total_bytes;
1002         void *attr_last;
1003         int ret;
1004
1005         if (or->attributes_mode &&
1006             or->attributes_mode != OSD_CDB_GET_SET_ATTR_LISTS) {
1007                 WARN_ON(1);
1008                 return -EINVAL;
1009         }
1010         or->attributes_mode = OSD_CDB_GET_SET_ATTR_LISTS;
1011
1012         /* first time calc data-in list header size */
1013         if (!or->get_attr.total_bytes)
1014                 or->get_attr.total_bytes = _osd_req_sizeof_alist_header(or);
1015
1016         /* calc data-out info */
1017         if (!total_bytes) { /* first-time: allocate and put list header */
1018                 unsigned max_bytes;
1019
1020                 total_bytes = _osd_req_sizeof_alist_header(or);
1021                 max_bytes = total_bytes +
1022                         nelem * sizeof(struct osd_attributes_list_attrid);
1023                 ret = _alloc_get_attr_desc(or, max_bytes);
1024                 if (ret)
1025                         return ret;
1026
1027                 _osd_req_set_alist_type(or, or->enc_get_attr.buff,
1028                                         OSD_ATTR_LIST_GET);
1029         }
1030         attr_last = or->enc_get_attr.buff + total_bytes;
1031
1032         for (; nelem; --nelem) {
1033                 struct osd_attributes_list_attrid *attrid;
1034                 const unsigned cur_size = sizeof(*attrid);
1035
1036                 total_bytes += cur_size;
1037                 if (unlikely(or->enc_get_attr.alloc_size < total_bytes)) {
1038                         or->enc_get_attr.total_bytes = total_bytes - cur_size;
1039                         ret = _alloc_get_attr_desc(or,
1040                                         total_bytes + nelem * sizeof(*attrid));
1041                         if (ret)
1042                                 return ret;
1043                         attr_last = or->enc_get_attr.buff +
1044                                 or->enc_get_attr.total_bytes;
1045                 }
1046
1047                 attrid = attr_last;
1048                 attrid->attr_page = cpu_to_be32(oa->attr_page);
1049                 attrid->attr_id = cpu_to_be32(oa->attr_id);
1050
1051                 attr_last += cur_size;
1052
1053                 /* calc data-in size */
1054                 or->get_attr.total_bytes +=
1055                         _osd_req_alist_elem_size(or, oa->len);
1056                 ++oa;
1057         }
1058
1059         or->enc_get_attr.total_bytes = total_bytes;
1060
1061         OSD_DEBUG(
1062                "get_attr.total_bytes=%u(%u) enc_get_attr.total_bytes=%u(%Zu)\n",
1063                or->get_attr.total_bytes,
1064                or->get_attr.total_bytes - _osd_req_sizeof_alist_header(or),
1065                or->enc_get_attr.total_bytes,
1066                (or->enc_get_attr.total_bytes - _osd_req_sizeof_alist_header(or))
1067                         / sizeof(struct osd_attributes_list_attrid));
1068
1069         return 0;
1070 }
1071 EXPORT_SYMBOL(osd_req_add_get_attr_list);
1072
1073 static int _osd_req_finalize_get_attr_list(struct osd_request *or)
1074 {
1075         struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb);
1076         unsigned out_padding;
1077         unsigned in_padding;
1078         int ret;
1079
1080         if (!or->enc_get_attr.total_bytes) {
1081                 cdbh->attrs_list.get_attr_desc_offset = OSD_OFFSET_UNUSED;
1082                 cdbh->attrs_list.get_attr_offset = OSD_OFFSET_UNUSED;
1083                 return 0;
1084         }
1085
1086         ret = _alloc_get_attr_list(or);
1087         if (ret)
1088                 return ret;
1089
1090         /* The out-going buffer info update */
1091         OSD_DEBUG("out-going\n");
1092         cdbh->attrs_list.get_attr_desc_bytes =
1093                 cpu_to_be32(or->enc_get_attr.total_bytes);
1094
1095         cdbh->attrs_list.get_attr_desc_offset =
1096                 osd_req_encode_offset(or, or->out.total_bytes, &out_padding);
1097
1098         ret = _req_append_segment(or, out_padding, &or->enc_get_attr,
1099                                   or->out.last_seg, &or->out);
1100         if (ret)
1101                 return ret;
1102         or->out.last_seg = &or->enc_get_attr;
1103
1104         /* The incoming buffer info update */
1105         OSD_DEBUG("in-coming\n");
1106         cdbh->attrs_list.get_attr_alloc_length =
1107                 cpu_to_be32(or->get_attr.total_bytes);
1108
1109         cdbh->attrs_list.get_attr_offset =
1110                 osd_req_encode_offset(or, or->in.total_bytes, &in_padding);
1111
1112         ret = _req_append_segment(or, in_padding, &or->get_attr, NULL,
1113                                   &or->in);
1114         if (ret)
1115                 return ret;
1116         or->in.last_seg = &or->get_attr;
1117
1118         return 0;
1119 }
1120
1121 int osd_req_decode_get_attr_list(struct osd_request *or,
1122         struct osd_attr *oa, int *nelem, void **iterator)
1123 {
1124         unsigned cur_bytes, returned_bytes;
1125         int n;
1126         const unsigned sizeof_attr_list = _osd_req_sizeof_alist_header(or);
1127         void *cur_p;
1128
1129         if (!_osd_req_is_alist_type(or, or->get_attr.buff,
1130                                     OSD_ATTR_LIST_SET_RETRIEVE)) {
1131                 oa->attr_page = 0;
1132                 oa->attr_id = 0;
1133                 oa->val_ptr = NULL;
1134                 oa->len = 0;
1135                 *iterator = NULL;
1136                 return 0;
1137         }
1138
1139         if (*iterator) {
1140                 BUG_ON((*iterator < or->get_attr.buff) ||
1141                      (or->get_attr.buff + or->get_attr.alloc_size < *iterator));
1142                 cur_p = *iterator;
1143                 cur_bytes = (*iterator - or->get_attr.buff) - sizeof_attr_list;
1144                 returned_bytes = or->get_attr.total_bytes;
1145         } else { /* first time decode the list header */
1146                 cur_bytes = sizeof_attr_list;
1147                 returned_bytes = _osd_req_alist_size(or, or->get_attr.buff) +
1148                                         sizeof_attr_list;
1149
1150                 cur_p = or->get_attr.buff + sizeof_attr_list;
1151
1152                 if (returned_bytes > or->get_attr.alloc_size) {
1153                         OSD_DEBUG("target report: space was not big enough! "
1154                                   "Allocate=%u Needed=%u\n",
1155                                   or->get_attr.alloc_size,
1156                                   returned_bytes + sizeof_attr_list);
1157
1158                         returned_bytes =
1159                                 or->get_attr.alloc_size - sizeof_attr_list;
1160                 }
1161                 or->get_attr.total_bytes = returned_bytes;
1162         }
1163
1164         for (n = 0; (n < *nelem) && (cur_bytes < returned_bytes); ++n) {
1165                 int inc = _osd_req_alist_elem_decode(or, cur_p, oa,
1166                                                  returned_bytes - cur_bytes);
1167
1168                 if (inc < 0) {
1169                         OSD_ERR("BAD FOOD from target. list not valid!"
1170                                 "c=%d r=%d n=%d\n",
1171                                 cur_bytes, returned_bytes, n);
1172                         oa->val_ptr = NULL;
1173                         break;
1174                 }
1175
1176                 cur_bytes += inc;
1177                 cur_p += inc;
1178                 ++oa;
1179         }
1180
1181         *iterator = (returned_bytes - cur_bytes) ? cur_p : NULL;
1182         *nelem = n;
1183         return returned_bytes - cur_bytes;
1184 }
1185 EXPORT_SYMBOL(osd_req_decode_get_attr_list);
1186
1187 /*
1188  * Attributes Page-mode
1189  */
1190
1191 int osd_req_add_get_attr_page(struct osd_request *or,
1192         u32 page_id, void *attar_page, unsigned max_page_len,
1193         const struct osd_attr *set_one_attr)
1194 {
1195         struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb);
1196
1197         if (or->attributes_mode &&
1198             or->attributes_mode != OSD_CDB_GET_ATTR_PAGE_SET_ONE) {
1199                 WARN_ON(1);
1200                 return -EINVAL;
1201         }
1202         or->attributes_mode = OSD_CDB_GET_ATTR_PAGE_SET_ONE;
1203
1204         or->get_attr.buff = attar_page;
1205         or->get_attr.total_bytes = max_page_len;
1206
1207         or->set_attr.buff = set_one_attr->val_ptr;
1208         or->set_attr.total_bytes = set_one_attr->len;
1209
1210         cdbh->attrs_page.get_attr_page = cpu_to_be32(page_id);
1211         cdbh->attrs_page.get_attr_alloc_length = cpu_to_be32(max_page_len);
1212         /* ocdb->attrs_page.get_attr_offset; */
1213
1214         cdbh->attrs_page.set_attr_page = cpu_to_be32(set_one_attr->attr_page);
1215         cdbh->attrs_page.set_attr_id = cpu_to_be32(set_one_attr->attr_id);
1216         cdbh->attrs_page.set_attr_length = cpu_to_be32(set_one_attr->len);
1217         /* ocdb->attrs_page.set_attr_offset; */
1218         return 0;
1219 }
1220 EXPORT_SYMBOL(osd_req_add_get_attr_page);
1221
1222 static int _osd_req_finalize_attr_page(struct osd_request *or)
1223 {
1224         struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb);
1225         unsigned in_padding, out_padding;
1226         int ret;
1227
1228         /* returned page */
1229         cdbh->attrs_page.get_attr_offset =
1230                 osd_req_encode_offset(or, or->in.total_bytes, &in_padding);
1231
1232         ret = _req_append_segment(or, in_padding, &or->get_attr, NULL,
1233                                   &or->in);
1234         if (ret)
1235                 return ret;
1236
1237         /* set one value */
1238         cdbh->attrs_page.set_attr_offset =
1239                 osd_req_encode_offset(or, or->out.total_bytes, &out_padding);
1240
1241         ret = _req_append_segment(or, out_padding, &or->enc_get_attr, NULL,
1242                                   &or->out);
1243         return ret;
1244 }
1245
1246 static inline void osd_sec_parms_set_out_offset(bool is_v1,
1247         struct osd_security_parameters *sec_parms, osd_cdb_offset offset)
1248 {
1249         if (is_v1)
1250                 sec_parms->v1.data_out_integrity_check_offset = offset;
1251         else
1252                 sec_parms->v2.data_out_integrity_check_offset = offset;
1253 }
1254
1255 static inline void osd_sec_parms_set_in_offset(bool is_v1,
1256         struct osd_security_parameters *sec_parms, osd_cdb_offset offset)
1257 {
1258         if (is_v1)
1259                 sec_parms->v1.data_in_integrity_check_offset = offset;
1260         else
1261                 sec_parms->v2.data_in_integrity_check_offset = offset;
1262 }
1263
1264 static int _osd_req_finalize_data_integrity(struct osd_request *or,
1265         bool has_in, bool has_out, u64 out_data_bytes, const u8 *cap_key)
1266 {
1267         struct osd_security_parameters *sec_parms = _osd_req_sec_params(or);
1268         int ret;
1269
1270         if (!osd_is_sec_alldata(sec_parms))
1271                 return 0;
1272
1273         if (has_out) {
1274                 struct _osd_req_data_segment seg = {
1275                         .buff = &or->out_data_integ,
1276                         .total_bytes = sizeof(or->out_data_integ),
1277                 };
1278                 unsigned pad;
1279
1280                 or->out_data_integ.data_bytes = cpu_to_be64(out_data_bytes);
1281                 or->out_data_integ.set_attributes_bytes = cpu_to_be64(
1282                         or->set_attr.total_bytes);
1283                 or->out_data_integ.get_attributes_bytes = cpu_to_be64(
1284                         or->enc_get_attr.total_bytes);
1285
1286                 osd_sec_parms_set_out_offset(osd_req_is_ver1(or), sec_parms,
1287                         osd_req_encode_offset(or, or->out.total_bytes, &pad));
1288
1289                 ret = _req_append_segment(or, pad, &seg, or->out.last_seg,
1290                                           &or->out);
1291                 if (ret)
1292                         return ret;
1293                 or->out.last_seg = NULL;
1294
1295                 /* they are now all chained to request sign them all together */
1296                 osd_sec_sign_data(&or->out_data_integ, or->out.req->bio,
1297                                   cap_key);
1298         }
1299
1300         if (has_in) {
1301                 struct _osd_req_data_segment seg = {
1302                         .buff = &or->in_data_integ,
1303                         .total_bytes = sizeof(or->in_data_integ),
1304                 };
1305                 unsigned pad;
1306
1307                 osd_sec_parms_set_in_offset(osd_req_is_ver1(or), sec_parms,
1308                         osd_req_encode_offset(or, or->in.total_bytes, &pad));
1309
1310                 ret = _req_append_segment(or, pad, &seg, or->in.last_seg,
1311                                           &or->in);
1312                 if (ret)
1313                         return ret;
1314
1315                 or->in.last_seg = NULL;
1316         }
1317
1318         return 0;
1319 }
1320
1321 /*
1322  * osd_finalize_request and helpers
1323  */
1324
1325 static int _init_blk_request(struct osd_request *or,
1326         bool has_in, bool has_out)
1327 {
1328         gfp_t flags = or->alloc_flags;
1329         struct scsi_device *scsi_device = or->osd_dev->scsi_device;
1330         struct request_queue *q = scsi_device->request_queue;
1331         struct request *req;
1332         int ret = -ENOMEM;
1333
1334         req = blk_get_request(q, has_out, flags);
1335         if (!req)
1336                 goto out;
1337
1338         or->request = req;
1339         req->cmd_type = REQ_TYPE_BLOCK_PC;
1340         req->timeout = or->timeout;
1341         req->retries = or->retries;
1342         req->sense = or->sense;
1343         req->sense_len = 0;
1344
1345         if (has_out) {
1346                 or->out.req = req;
1347                 if (has_in) {
1348                         /* allocate bidi request */
1349                         req = blk_get_request(q, READ, flags);
1350                         if (!req) {
1351                                 OSD_DEBUG("blk_get_request for bidi failed\n");
1352                                 goto out;
1353                         }
1354                         req->cmd_type = REQ_TYPE_BLOCK_PC;
1355                         or->in.req = or->request->next_rq = req;
1356                 }
1357         } else if (has_in)
1358                 or->in.req = req;
1359
1360         ret = 0;
1361 out:
1362         OSD_DEBUG("or=%p has_in=%d has_out=%d => %d, %p\n",
1363                         or, has_in, has_out, ret, or->request);
1364         return ret;
1365 }
1366
1367 int osd_finalize_request(struct osd_request *or,
1368         u8 options, const void *cap, const u8 *cap_key)
1369 {
1370         struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb);
1371         bool has_in, has_out;
1372         u64 out_data_bytes = or->out.total_bytes;
1373         int ret;
1374
1375         if (options & OSD_REQ_FUA)
1376                 cdbh->options |= OSD_CDB_FUA;
1377
1378         if (options & OSD_REQ_DPO)
1379                 cdbh->options |= OSD_CDB_DPO;
1380
1381         if (options & OSD_REQ_BYPASS_TIMESTAMPS)
1382                 cdbh->timestamp_control = OSD_CDB_BYPASS_TIMESTAMPS;
1383
1384         osd_set_caps(&or->cdb, cap);
1385
1386         has_in = or->in.bio || or->get_attr.total_bytes;
1387         has_out = or->out.bio || or->set_attr.total_bytes ||
1388                 or->enc_get_attr.total_bytes;
1389
1390         ret = _init_blk_request(or, has_in, has_out);
1391         if (ret) {
1392                 OSD_DEBUG("_init_blk_request failed\n");
1393                 return ret;
1394         }
1395
1396         if (or->out.bio) {
1397                 ret = blk_rq_append_bio(or->request->q, or->out.req,
1398                                         or->out.bio);
1399                 if (ret) {
1400                         OSD_DEBUG("blk_rq_append_bio out failed\n");
1401                         return ret;
1402                 }
1403                 OSD_DEBUG("out bytes=%llu (bytes_req=%u)\n",
1404                         _LLU(or->out.total_bytes), or->out.req->data_len);
1405         }
1406         if (or->in.bio) {
1407                 ret = blk_rq_append_bio(or->request->q, or->in.req, or->in.bio);
1408                 if (ret) {
1409                         OSD_DEBUG("blk_rq_append_bio in failed\n");
1410                         return ret;
1411                 }
1412                 OSD_DEBUG("in bytes=%llu (bytes_req=%u)\n",
1413                         _LLU(or->in.total_bytes), or->in.req->data_len);
1414         }
1415
1416         or->out.pad_buff = sg_out_pad_buffer;
1417         or->in.pad_buff = sg_in_pad_buffer;
1418
1419         if (!or->attributes_mode)
1420                 or->attributes_mode = OSD_CDB_GET_SET_ATTR_LISTS;
1421         cdbh->command_specific_options |= or->attributes_mode;
1422         if (or->attributes_mode == OSD_CDB_GET_ATTR_PAGE_SET_ONE) {
1423                 ret = _osd_req_finalize_attr_page(or);
1424         } else {
1425                 /* TODO: I think that for the GET_ATTR command these 2 should
1426                  * be reversed to keep them in execution order (for embeded
1427                  * targets with low memory footprint)
1428                  */
1429                 ret = _osd_req_finalize_set_attr_list(or);
1430                 if (ret) {
1431                         OSD_DEBUG("_osd_req_finalize_set_attr_list failed\n");
1432                         return ret;
1433                 }
1434
1435                 ret = _osd_req_finalize_get_attr_list(or);
1436                 if (ret) {
1437                         OSD_DEBUG("_osd_req_finalize_get_attr_list failed\n");
1438                         return ret;
1439                 }
1440         }
1441
1442         ret = _osd_req_finalize_data_integrity(or, has_in, has_out,
1443                                                out_data_bytes, cap_key);
1444         if (ret)
1445                 return ret;
1446
1447         osd_sec_sign_cdb(&or->cdb, cap_key);
1448
1449         or->request->cmd = or->cdb.buff;
1450         or->request->cmd_len = _osd_req_cdb_len(or);
1451
1452         return 0;
1453 }
1454 EXPORT_SYMBOL(osd_finalize_request);
1455
1456 #define OSD_SENSE_PRINT1(fmt, a...) \
1457         do { \
1458                 if (__cur_sense_need_output) \
1459                         OSD_ERR(fmt, ##a); \
1460         } while (0)
1461
1462 #define OSD_SENSE_PRINT2(fmt, a...) OSD_SENSE_PRINT1("    " fmt, ##a)
1463
1464 int osd_req_decode_sense_full(struct osd_request *or,
1465         struct osd_sense_info *osi, bool silent,
1466         struct osd_obj_id *bad_obj_list __unused, int max_obj __unused,
1467         struct osd_attr *bad_attr_list, int max_attr)
1468 {
1469         int sense_len, original_sense_len;
1470         struct osd_sense_info local_osi;
1471         struct scsi_sense_descriptor_based *ssdb;
1472         void *cur_descriptor;
1473 #if (CONFIG_SCSI_OSD_DPRINT_SENSE == 0)
1474         const bool __cur_sense_need_output = false;
1475 #else
1476         bool __cur_sense_need_output = !silent;
1477 #endif
1478
1479         if (!or->request->errors)
1480                 return 0;
1481
1482         ssdb = or->request->sense;
1483         sense_len = or->request->sense_len;
1484         if ((sense_len < (int)sizeof(*ssdb) || !ssdb->sense_key)) {
1485                 OSD_ERR("Block-layer returned error(0x%x) but "
1486                         "sense_len(%u) || key(%d) is empty\n",
1487                         or->request->errors, sense_len, ssdb->sense_key);
1488                 return -EIO;
1489         }
1490
1491         if ((ssdb->response_code != 0x72) && (ssdb->response_code != 0x73)) {
1492                 OSD_ERR("Unrecognized scsi sense: rcode=%x length=%d\n",
1493                         ssdb->response_code, sense_len);
1494                 return -EIO;
1495         }
1496
1497         osi = osi ? : &local_osi;
1498         memset(osi, 0, sizeof(*osi));
1499         osi->key = ssdb->sense_key;
1500         osi->additional_code = be16_to_cpu(ssdb->additional_sense_code);
1501         original_sense_len = ssdb->additional_sense_length + 8;
1502
1503 #if (CONFIG_SCSI_OSD_DPRINT_SENSE == 1)
1504         if (__cur_sense_need_output)
1505                 __cur_sense_need_output = (osi->key > scsi_sk_recovered_error);
1506 #endif
1507         OSD_SENSE_PRINT1("Main Sense information key=0x%x length(%d, %d) "
1508                         "additional_code=0x%x\n",
1509                         osi->key, original_sense_len, sense_len,
1510                         osi->additional_code);
1511
1512         if (original_sense_len < sense_len)
1513                 sense_len = original_sense_len;
1514
1515         cur_descriptor = ssdb->ssd;
1516         sense_len -= sizeof(*ssdb);
1517         while (sense_len > 0) {
1518                 struct scsi_sense_descriptor *ssd = cur_descriptor;
1519                 int cur_len = ssd->additional_length + 2;
1520
1521                 sense_len -= cur_len;
1522
1523                 if (sense_len < 0)
1524                         break; /* sense was truncated */
1525
1526                 switch (ssd->descriptor_type) {
1527                 case scsi_sense_information:
1528                 case scsi_sense_command_specific_information:
1529                 {
1530                         struct scsi_sense_command_specific_data_descriptor
1531                                 *sscd = cur_descriptor;
1532
1533                         osi->command_info =
1534                                 get_unaligned_be64(&sscd->information) ;
1535                         OSD_SENSE_PRINT2(
1536                                 "command_specific_information 0x%llx \n",
1537                                 _LLU(osi->command_info));
1538                         break;
1539                 }
1540                 case scsi_sense_key_specific:
1541                 {
1542                         struct scsi_sense_key_specific_data_descriptor
1543                                 *ssks = cur_descriptor;
1544
1545                         osi->sense_info = get_unaligned_be16(&ssks->value);
1546                         OSD_SENSE_PRINT2(
1547                                 "sense_key_specific_information %u"
1548                                 "sksv_cd_bpv_bp (0x%x)\n",
1549                                 osi->sense_info, ssks->sksv_cd_bpv_bp);
1550                         break;
1551                 }
1552                 case osd_sense_object_identification:
1553                 { /*FIXME: Keep first not last, Store in array*/
1554                         struct osd_sense_identification_data_descriptor
1555                                 *osidd = cur_descriptor;
1556
1557                         osi->not_initiated_command_functions =
1558                                 le32_to_cpu(osidd->not_initiated_functions);
1559                         osi->completed_command_functions =
1560                                 le32_to_cpu(osidd->completed_functions);
1561                         osi->obj.partition = be64_to_cpu(osidd->partition_id);
1562                         osi->obj.id = be64_to_cpu(osidd->object_id);
1563                         OSD_SENSE_PRINT2(
1564                                 "object_identification pid=0x%llx oid=0x%llx\n",
1565                                 _LLU(osi->obj.partition), _LLU(osi->obj.id));
1566                         OSD_SENSE_PRINT2(
1567                                 "not_initiated_bits(%x) "
1568                                 "completed_command_bits(%x)\n",
1569                                 osi->not_initiated_command_functions,
1570                                 osi->completed_command_functions);
1571                         break;
1572                 }
1573                 case osd_sense_response_integrity_check:
1574                 {
1575                         struct osd_sense_response_integrity_check_descriptor
1576                                 *osricd = cur_descriptor;
1577                         const unsigned len =
1578                                           sizeof(osricd->integrity_check_value);
1579                         char key_dump[len*4 + 2]; /* 2nibbles+space+ASCII */
1580
1581                         hex_dump_to_buffer(osricd->integrity_check_value, len,
1582                                        32, 1, key_dump, sizeof(key_dump), true);
1583                         OSD_SENSE_PRINT2("response_integrity [%s]\n", key_dump);
1584                 }
1585                 case osd_sense_attribute_identification:
1586                 {
1587                         struct osd_sense_attributes_data_descriptor
1588                                 *osadd = cur_descriptor;
1589                         int len = min(cur_len, sense_len);
1590                         int i = 0;
1591                         struct osd_sense_attr *pattr = osadd->sense_attrs;
1592
1593                         while (len < 0) {
1594                                 u32 attr_page = be32_to_cpu(pattr->attr_page);
1595                                 u32 attr_id = be32_to_cpu(pattr->attr_id);
1596
1597                                 if (i++ == 0) {
1598                                         osi->attr.attr_page = attr_page;
1599                                         osi->attr.attr_id = attr_id;
1600                                 }
1601
1602                                 if (bad_attr_list && max_attr) {
1603                                         bad_attr_list->attr_page = attr_page;
1604                                         bad_attr_list->attr_id = attr_id;
1605                                         bad_attr_list++;
1606                                         max_attr--;
1607                                 }
1608                                 OSD_SENSE_PRINT2(
1609                                         "osd_sense_attribute_identification"
1610                                         "attr_page=0x%x attr_id=0x%x\n",
1611                                         attr_page, attr_id);
1612                         }
1613                 }
1614                 /*These are not legal for OSD*/
1615                 case scsi_sense_field_replaceable_unit:
1616                         OSD_SENSE_PRINT2("scsi_sense_field_replaceable_unit\n");
1617                         break;
1618                 case scsi_sense_stream_commands:
1619                         OSD_SENSE_PRINT2("scsi_sense_stream_commands\n");
1620                         break;
1621                 case scsi_sense_block_commands:
1622                         OSD_SENSE_PRINT2("scsi_sense_block_commands\n");
1623                         break;
1624                 case scsi_sense_ata_return:
1625                         OSD_SENSE_PRINT2("scsi_sense_ata_return\n");
1626                         break;
1627                 default:
1628                         if (ssd->descriptor_type <= scsi_sense_Reserved_last)
1629                                 OSD_SENSE_PRINT2(
1630                                         "scsi_sense Reserved descriptor (0x%x)",
1631                                         ssd->descriptor_type);
1632                         else
1633                                 OSD_SENSE_PRINT2(
1634                                         "scsi_sense Vendor descriptor (0x%x)",
1635                                         ssd->descriptor_type);
1636                 }
1637
1638                 cur_descriptor += cur_len;
1639         }
1640
1641         return (osi->key > scsi_sk_recovered_error) ? -EIO : 0;
1642 }
1643 EXPORT_SYMBOL(osd_req_decode_sense_full);
1644
1645 /*
1646  * Implementation of osd_sec.h API
1647  * TODO: Move to a separate osd_sec.c file at a later stage.
1648  */
1649
1650 enum { OSD_SEC_CAP_V1_ALL_CAPS =
1651         OSD_SEC_CAP_APPEND | OSD_SEC_CAP_OBJ_MGMT | OSD_SEC_CAP_REMOVE   |
1652         OSD_SEC_CAP_CREATE | OSD_SEC_CAP_SET_ATTR | OSD_SEC_CAP_GET_ATTR |
1653         OSD_SEC_CAP_WRITE  | OSD_SEC_CAP_READ     | OSD_SEC_CAP_POL_SEC  |
1654         OSD_SEC_CAP_GLOBAL | OSD_SEC_CAP_DEV_MGMT
1655 };
1656
1657 enum { OSD_SEC_CAP_V2_ALL_CAPS =
1658         OSD_SEC_CAP_V1_ALL_CAPS | OSD_SEC_CAP_QUERY | OSD_SEC_CAP_M_OBJECT
1659 };
1660
1661 void osd_sec_init_nosec_doall_caps(void *caps,
1662         const struct osd_obj_id *obj, bool is_collection, const bool is_v1)
1663 {
1664         struct osd_capability *cap = caps;
1665         u8 type;
1666         u8 descriptor_type;
1667
1668         if (likely(obj->id)) {
1669                 if (unlikely(is_collection)) {
1670                         type = OSD_SEC_OBJ_COLLECTION;
1671                         descriptor_type = is_v1 ? OSD_SEC_OBJ_DESC_OBJ :
1672                                                   OSD_SEC_OBJ_DESC_COL;
1673                 } else {
1674                         type = OSD_SEC_OBJ_USER;
1675                         descriptor_type = OSD_SEC_OBJ_DESC_OBJ;
1676                 }
1677                 WARN_ON(!obj->partition);
1678         } else {
1679                 type = obj->partition ? OSD_SEC_OBJ_PARTITION :
1680                                         OSD_SEC_OBJ_ROOT;
1681                 descriptor_type = OSD_SEC_OBJ_DESC_PAR;
1682         }
1683
1684         memset(cap, 0, sizeof(*cap));
1685
1686         cap->h.format = OSD_SEC_CAP_FORMAT_VER1;
1687         cap->h.integrity_algorithm__key_version = 0; /* MAKE_BYTE(0, 0); */
1688         cap->h.security_method = OSD_SEC_NOSEC;
1689 /*      cap->expiration_time;
1690         cap->AUDIT[30-10];
1691         cap->discriminator[42-30];
1692         cap->object_created_time; */
1693         cap->h.object_type = type;
1694         osd_sec_set_caps(&cap->h, OSD_SEC_CAP_V1_ALL_CAPS);
1695         cap->h.object_descriptor_type = descriptor_type;
1696         cap->od.obj_desc.policy_access_tag = 0;
1697         cap->od.obj_desc.allowed_partition_id = cpu_to_be64(obj->partition);
1698         cap->od.obj_desc.allowed_object_id = cpu_to_be64(obj->id);
1699 }
1700 EXPORT_SYMBOL(osd_sec_init_nosec_doall_caps);
1701
1702 /* FIXME: Extract version from caps pointer.
1703  *        Also Pete's target only supports caps from OSDv1 for now
1704  */
1705 void osd_set_caps(struct osd_cdb *cdb, const void *caps)
1706 {
1707         bool is_ver1 = true;
1708         /* NOTE: They start at same address */
1709         memcpy(&cdb->v1.caps, caps, is_ver1 ? OSDv1_CAP_LEN : OSD_CAP_LEN);
1710 }
1711
1712 bool osd_is_sec_alldata(struct osd_security_parameters *sec_parms __unused)
1713 {
1714         return false;
1715 }
1716
1717 void osd_sec_sign_cdb(struct osd_cdb *ocdb __unused, const u8 *cap_key __unused)
1718 {
1719 }
1720
1721 void osd_sec_sign_data(void *data_integ __unused,
1722                        struct bio *bio __unused, const u8 *cap_key __unused)
1723 {
1724 }
1725
1726 /*
1727  * Declared in osd_protocol.h
1728  * 4.12.5 Data-In and Data-Out buffer offsets
1729  * byte offset = mantissa * (2^(exponent+8))
1730  * Returns the smallest allowed encoded offset that contains given @offset
1731  * The actual encoded offset returned is @offset + *@padding.
1732  */
1733 osd_cdb_offset __osd_encode_offset(
1734         u64 offset, unsigned *padding, int min_shift, int max_shift)
1735 {
1736         u64 try_offset = -1, mod, align;
1737         osd_cdb_offset be32_offset;
1738         int shift;
1739
1740         *padding = 0;
1741         if (!offset)
1742                 return 0;
1743
1744         for (shift = min_shift; shift < max_shift; ++shift) {
1745                 try_offset = offset >> shift;
1746                 if (try_offset < (1 << OSD_OFFSET_MAX_BITS))
1747                         break;
1748         }
1749
1750         BUG_ON(shift == max_shift);
1751
1752         align = 1 << shift;
1753         mod = offset & (align - 1);
1754         if (mod) {
1755                 *padding = align - mod;
1756                 try_offset += 1;
1757         }
1758
1759         try_offset |= ((shift - 8) & 0xf) << 28;
1760         be32_offset = cpu_to_be32((u32)try_offset);
1761
1762         OSD_DEBUG("offset=%llu mantissa=%llu exp=%d encoded=%x pad=%d\n",
1763                  _LLU(offset), _LLU(try_offset & 0x0FFFFFFF), shift,
1764                  be32_offset, *padding);
1765         return be32_offset;
1766 }