Boaz Harrosh | 02941a5 | 2009-01-25 16:55:30 +0200 | [diff] [blame] | 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/scsi_device.h> |
| 45 | |
| 46 | #include "osd_debug.h" |
| 47 | |
Boaz Harrosh | 4ef1a3d | 2009-01-25 16:59:50 +0200 | [diff] [blame^] | 48 | #ifndef __unused |
| 49 | # define __unused __attribute__((unused)) |
| 50 | #endif |
| 51 | |
Boaz Harrosh | 02941a5 | 2009-01-25 16:55:30 +0200 | [diff] [blame] | 52 | enum { OSD_REQ_RETRIES = 1 }; |
| 53 | |
| 54 | MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>"); |
| 55 | MODULE_DESCRIPTION("open-osd initiator library libosd.ko"); |
| 56 | MODULE_LICENSE("GPL"); |
| 57 | |
| 58 | static inline void build_test(void) |
| 59 | { |
| 60 | /* structures were not packed */ |
| 61 | BUILD_BUG_ON(sizeof(struct osd_capability) != OSD_CAP_LEN); |
| 62 | BUILD_BUG_ON(sizeof(struct osdv1_cdb) != OSDv1_TOTAL_CDB_LEN); |
| 63 | } |
| 64 | |
| 65 | static unsigned _osd_req_cdb_len(struct osd_request *or) |
| 66 | { |
| 67 | return OSDv1_TOTAL_CDB_LEN; |
| 68 | } |
| 69 | |
Boaz Harrosh | 4ef1a3d | 2009-01-25 16:59:50 +0200 | [diff] [blame^] | 70 | static unsigned _osd_req_alist_elem_size(struct osd_request *or, unsigned len) |
| 71 | { |
| 72 | return osdv1_attr_list_elem_size(len); |
| 73 | } |
| 74 | |
| 75 | static unsigned _osd_req_alist_size(struct osd_request *or, void *list_head) |
| 76 | { |
| 77 | return osdv1_list_size(list_head); |
| 78 | } |
| 79 | |
| 80 | static unsigned _osd_req_sizeof_alist_header(struct osd_request *or) |
| 81 | { |
| 82 | return sizeof(struct osdv1_attributes_list_header); |
| 83 | } |
| 84 | |
| 85 | static void _osd_req_set_alist_type(struct osd_request *or, |
| 86 | void *list, int list_type) |
| 87 | { |
| 88 | struct osdv1_attributes_list_header *attr_list = list; |
| 89 | |
| 90 | memset(attr_list, 0, sizeof(*attr_list)); |
| 91 | attr_list->type = list_type; |
| 92 | } |
| 93 | |
| 94 | static bool _osd_req_is_alist_type(struct osd_request *or, |
| 95 | void *list, int list_type) |
| 96 | { |
| 97 | if (!list) |
| 98 | return false; |
| 99 | |
| 100 | if (1) { |
| 101 | struct osdv1_attributes_list_header *attr_list = list; |
| 102 | |
| 103 | return attr_list->type == list_type; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | static osd_cdb_offset osd_req_encode_offset(struct osd_request *or, |
| 108 | u64 offset, unsigned *padding) |
| 109 | { |
| 110 | return __osd_encode_offset(offset, padding, |
| 111 | OSDv1_OFFSET_MIN_SHIFT, OSD_OFFSET_MAX_SHIFT); |
| 112 | } |
| 113 | |
Boaz Harrosh | 02941a5 | 2009-01-25 16:55:30 +0200 | [diff] [blame] | 114 | void osd_dev_init(struct osd_dev *osdd, struct scsi_device *scsi_device) |
| 115 | { |
| 116 | memset(osdd, 0, sizeof(*osdd)); |
| 117 | osdd->scsi_device = scsi_device; |
| 118 | osdd->def_timeout = BLK_DEFAULT_SG_TIMEOUT; |
| 119 | /* TODO: Allocate pools for osd_request attributes ... */ |
| 120 | } |
| 121 | EXPORT_SYMBOL(osd_dev_init); |
| 122 | |
| 123 | void osd_dev_fini(struct osd_dev *osdd) |
| 124 | { |
| 125 | /* TODO: De-allocate pools */ |
| 126 | |
| 127 | osdd->scsi_device = NULL; |
| 128 | } |
| 129 | EXPORT_SYMBOL(osd_dev_fini); |
| 130 | |
| 131 | static struct osd_request *_osd_request_alloc(gfp_t gfp) |
| 132 | { |
| 133 | struct osd_request *or; |
| 134 | |
| 135 | /* TODO: Use mempool with one saved request */ |
| 136 | or = kzalloc(sizeof(*or), gfp); |
| 137 | return or; |
| 138 | } |
| 139 | |
| 140 | static void _osd_request_free(struct osd_request *or) |
| 141 | { |
| 142 | kfree(or); |
| 143 | } |
| 144 | |
| 145 | struct osd_request *osd_start_request(struct osd_dev *dev, gfp_t gfp) |
| 146 | { |
| 147 | struct osd_request *or; |
| 148 | |
| 149 | or = _osd_request_alloc(gfp); |
| 150 | if (!or) |
| 151 | return NULL; |
| 152 | |
| 153 | or->osd_dev = dev; |
| 154 | or->alloc_flags = gfp; |
| 155 | or->timeout = dev->def_timeout; |
| 156 | or->retries = OSD_REQ_RETRIES; |
| 157 | |
| 158 | return or; |
| 159 | } |
| 160 | EXPORT_SYMBOL(osd_start_request); |
| 161 | |
| 162 | /* |
| 163 | * If osd_finalize_request() was called but the request was not executed through |
| 164 | * the block layer, then we must release BIOs. |
| 165 | */ |
| 166 | static void _abort_unexecuted_bios(struct request *rq) |
| 167 | { |
| 168 | struct bio *bio; |
| 169 | |
| 170 | while ((bio = rq->bio) != NULL) { |
| 171 | rq->bio = bio->bi_next; |
| 172 | bio_endio(bio, 0); |
| 173 | } |
| 174 | } |
| 175 | |
Boaz Harrosh | 4ef1a3d | 2009-01-25 16:59:50 +0200 | [diff] [blame^] | 176 | static void _osd_free_seg(struct osd_request *or __unused, |
| 177 | struct _osd_req_data_segment *seg) |
| 178 | { |
| 179 | if (!seg->buff || !seg->alloc_size) |
| 180 | return; |
| 181 | |
| 182 | kfree(seg->buff); |
| 183 | seg->buff = NULL; |
| 184 | seg->alloc_size = 0; |
| 185 | } |
| 186 | |
Boaz Harrosh | 02941a5 | 2009-01-25 16:55:30 +0200 | [diff] [blame] | 187 | void osd_end_request(struct osd_request *or) |
| 188 | { |
| 189 | struct request *rq = or->request; |
| 190 | |
Boaz Harrosh | 4ef1a3d | 2009-01-25 16:59:50 +0200 | [diff] [blame^] | 191 | _osd_free_seg(or, &or->set_attr); |
| 192 | _osd_free_seg(or, &or->enc_get_attr); |
| 193 | _osd_free_seg(or, &or->get_attr); |
| 194 | |
Boaz Harrosh | 02941a5 | 2009-01-25 16:55:30 +0200 | [diff] [blame] | 195 | if (rq) { |
| 196 | if (rq->next_rq) { |
| 197 | _abort_unexecuted_bios(rq->next_rq); |
| 198 | blk_put_request(rq->next_rq); |
| 199 | } |
| 200 | |
| 201 | _abort_unexecuted_bios(rq); |
| 202 | blk_put_request(rq); |
| 203 | } |
| 204 | _osd_request_free(or); |
| 205 | } |
| 206 | EXPORT_SYMBOL(osd_end_request); |
| 207 | |
| 208 | int osd_execute_request(struct osd_request *or) |
| 209 | { |
| 210 | return blk_execute_rq(or->request->q, NULL, or->request, 0); |
| 211 | } |
| 212 | EXPORT_SYMBOL(osd_execute_request); |
| 213 | |
| 214 | static void osd_request_async_done(struct request *req, int error) |
| 215 | { |
| 216 | struct osd_request *or = req->end_io_data; |
| 217 | |
| 218 | or->async_error = error; |
| 219 | |
| 220 | if (error) |
| 221 | OSD_DEBUG("osd_request_async_done error recieved %d\n", error); |
| 222 | |
| 223 | if (or->async_done) |
| 224 | or->async_done(or, or->async_private); |
| 225 | else |
| 226 | osd_end_request(or); |
| 227 | } |
| 228 | |
| 229 | int osd_execute_request_async(struct osd_request *or, |
| 230 | osd_req_done_fn *done, void *private) |
| 231 | { |
| 232 | or->request->end_io_data = or; |
| 233 | or->async_private = private; |
| 234 | or->async_done = done; |
| 235 | |
| 236 | blk_execute_rq_nowait(or->request->q, NULL, or->request, 0, |
| 237 | osd_request_async_done); |
| 238 | return 0; |
| 239 | } |
| 240 | EXPORT_SYMBOL(osd_execute_request_async); |
| 241 | |
Boaz Harrosh | 4ef1a3d | 2009-01-25 16:59:50 +0200 | [diff] [blame^] | 242 | u8 sg_out_pad_buffer[1 << OSDv1_OFFSET_MIN_SHIFT]; |
| 243 | u8 sg_in_pad_buffer[1 << OSDv1_OFFSET_MIN_SHIFT]; |
| 244 | |
| 245 | static int _osd_realloc_seg(struct osd_request *or, |
| 246 | struct _osd_req_data_segment *seg, unsigned max_bytes) |
| 247 | { |
| 248 | void *buff; |
| 249 | |
| 250 | if (seg->alloc_size >= max_bytes) |
| 251 | return 0; |
| 252 | |
| 253 | buff = krealloc(seg->buff, max_bytes, or->alloc_flags); |
| 254 | if (!buff) { |
| 255 | OSD_ERR("Failed to Realloc %d-bytes was-%d\n", max_bytes, |
| 256 | seg->alloc_size); |
| 257 | return -ENOMEM; |
| 258 | } |
| 259 | |
| 260 | memset(buff + seg->alloc_size, 0, max_bytes - seg->alloc_size); |
| 261 | seg->buff = buff; |
| 262 | seg->alloc_size = max_bytes; |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | static int _alloc_set_attr_list(struct osd_request *or, |
| 267 | const struct osd_attr *oa, unsigned nelem, unsigned add_bytes) |
| 268 | { |
| 269 | unsigned total_bytes = add_bytes; |
| 270 | |
| 271 | for (; nelem; --nelem, ++oa) |
| 272 | total_bytes += _osd_req_alist_elem_size(or, oa->len); |
| 273 | |
| 274 | OSD_DEBUG("total_bytes=%d\n", total_bytes); |
| 275 | return _osd_realloc_seg(or, &or->set_attr, total_bytes); |
| 276 | } |
| 277 | |
| 278 | static int _alloc_get_attr_desc(struct osd_request *or, unsigned max_bytes) |
| 279 | { |
| 280 | OSD_DEBUG("total_bytes=%d\n", max_bytes); |
| 281 | return _osd_realloc_seg(or, &or->enc_get_attr, max_bytes); |
| 282 | } |
| 283 | |
| 284 | static int _alloc_get_attr_list(struct osd_request *or) |
| 285 | { |
| 286 | OSD_DEBUG("total_bytes=%d\n", or->get_attr.total_bytes); |
| 287 | return _osd_realloc_seg(or, &or->get_attr, or->get_attr.total_bytes); |
| 288 | } |
| 289 | |
Boaz Harrosh | 02941a5 | 2009-01-25 16:55:30 +0200 | [diff] [blame] | 290 | /* |
| 291 | * Common to all OSD commands |
| 292 | */ |
| 293 | |
| 294 | static void _osdv1_req_encode_common(struct osd_request *or, |
| 295 | __be16 act, const struct osd_obj_id *obj, u64 offset, u64 len) |
| 296 | { |
| 297 | struct osdv1_cdb *ocdb = &or->cdb.v1; |
| 298 | |
| 299 | /* |
| 300 | * For speed, the commands |
| 301 | * OSD_ACT_PERFORM_SCSI_COMMAND , V1 0x8F7E, V2 0x8F7C |
| 302 | * OSD_ACT_SCSI_TASK_MANAGEMENT , V1 0x8F7F, V2 0x8F7D |
| 303 | * are not supported here. Should pass zero and set after the call |
| 304 | */ |
| 305 | act &= cpu_to_be16(~0x0080); /* V1 action code */ |
| 306 | |
| 307 | OSD_DEBUG("OSDv1 execute opcode 0x%x\n", be16_to_cpu(act)); |
| 308 | |
| 309 | ocdb->h.varlen_cdb.opcode = VARIABLE_LENGTH_CMD; |
| 310 | ocdb->h.varlen_cdb.additional_cdb_length = OSD_ADDITIONAL_CDB_LENGTH; |
| 311 | ocdb->h.varlen_cdb.service_action = act; |
| 312 | |
| 313 | ocdb->h.partition = cpu_to_be64(obj->partition); |
| 314 | ocdb->h.object = cpu_to_be64(obj->id); |
| 315 | ocdb->h.v1.length = cpu_to_be64(len); |
| 316 | ocdb->h.v1.start_address = cpu_to_be64(offset); |
| 317 | } |
| 318 | |
| 319 | static void _osd_req_encode_common(struct osd_request *or, |
| 320 | __be16 act, const struct osd_obj_id *obj, u64 offset, u64 len) |
| 321 | { |
| 322 | _osdv1_req_encode_common(or, act, obj, offset, len); |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Device commands |
| 327 | */ |
| 328 | void osd_req_format(struct osd_request *or, u64 tot_capacity) |
| 329 | { |
| 330 | _osd_req_encode_common(or, OSD_ACT_FORMAT_OSD, &osd_root_object, 0, |
| 331 | tot_capacity); |
| 332 | } |
| 333 | EXPORT_SYMBOL(osd_req_format); |
| 334 | |
| 335 | /* |
| 336 | * Partition commands |
| 337 | */ |
| 338 | static void _osd_req_encode_partition(struct osd_request *or, |
| 339 | __be16 act, osd_id partition) |
| 340 | { |
| 341 | struct osd_obj_id par = { |
| 342 | .partition = partition, |
| 343 | .id = 0, |
| 344 | }; |
| 345 | |
| 346 | _osd_req_encode_common(or, act, &par, 0, 0); |
| 347 | } |
| 348 | |
| 349 | void osd_req_create_partition(struct osd_request *or, osd_id partition) |
| 350 | { |
| 351 | _osd_req_encode_partition(or, OSD_ACT_CREATE_PARTITION, partition); |
| 352 | } |
| 353 | EXPORT_SYMBOL(osd_req_create_partition); |
| 354 | |
| 355 | void osd_req_remove_partition(struct osd_request *or, osd_id partition) |
| 356 | { |
| 357 | _osd_req_encode_partition(or, OSD_ACT_REMOVE_PARTITION, partition); |
| 358 | } |
| 359 | EXPORT_SYMBOL(osd_req_remove_partition); |
| 360 | |
| 361 | /* |
| 362 | * Object commands |
| 363 | */ |
| 364 | void osd_req_create_object(struct osd_request *or, struct osd_obj_id *obj) |
| 365 | { |
| 366 | _osd_req_encode_common(or, OSD_ACT_CREATE, obj, 0, 0); |
| 367 | } |
| 368 | EXPORT_SYMBOL(osd_req_create_object); |
| 369 | |
| 370 | void osd_req_remove_object(struct osd_request *or, struct osd_obj_id *obj) |
| 371 | { |
| 372 | _osd_req_encode_common(or, OSD_ACT_REMOVE, obj, 0, 0); |
| 373 | } |
| 374 | EXPORT_SYMBOL(osd_req_remove_object); |
| 375 | |
| 376 | void osd_req_write(struct osd_request *or, |
| 377 | const struct osd_obj_id *obj, struct bio *bio, u64 offset) |
| 378 | { |
| 379 | _osd_req_encode_common(or, OSD_ACT_WRITE, obj, offset, bio->bi_size); |
| 380 | WARN_ON(or->out.bio || or->out.total_bytes); |
| 381 | bio->bi_rw |= (1 << BIO_RW); |
| 382 | or->out.bio = bio; |
| 383 | or->out.total_bytes = bio->bi_size; |
| 384 | } |
| 385 | EXPORT_SYMBOL(osd_req_write); |
| 386 | |
| 387 | void osd_req_read(struct osd_request *or, |
| 388 | const struct osd_obj_id *obj, struct bio *bio, u64 offset) |
| 389 | { |
| 390 | _osd_req_encode_common(or, OSD_ACT_READ, obj, offset, bio->bi_size); |
| 391 | WARN_ON(or->in.bio || or->in.total_bytes); |
| 392 | bio->bi_rw &= ~(1 << BIO_RW); |
| 393 | or->in.bio = bio; |
| 394 | or->in.total_bytes = bio->bi_size; |
| 395 | } |
| 396 | EXPORT_SYMBOL(osd_req_read); |
| 397 | |
Boaz Harrosh | 4ef1a3d | 2009-01-25 16:59:50 +0200 | [diff] [blame^] | 398 | void osd_req_get_attributes(struct osd_request *or, |
| 399 | const struct osd_obj_id *obj) |
| 400 | { |
| 401 | _osd_req_encode_common(or, OSD_ACT_GET_ATTRIBUTES, obj, 0, 0); |
| 402 | } |
| 403 | EXPORT_SYMBOL(osd_req_get_attributes); |
| 404 | |
| 405 | void osd_req_set_attributes(struct osd_request *or, |
| 406 | const struct osd_obj_id *obj) |
| 407 | { |
| 408 | _osd_req_encode_common(or, OSD_ACT_SET_ATTRIBUTES, obj, 0, 0); |
| 409 | } |
| 410 | EXPORT_SYMBOL(osd_req_set_attributes); |
| 411 | |
| 412 | /* |
| 413 | * Attributes List-mode |
| 414 | */ |
| 415 | |
| 416 | int osd_req_add_set_attr_list(struct osd_request *or, |
| 417 | const struct osd_attr *oa, unsigned nelem) |
| 418 | { |
| 419 | unsigned total_bytes = or->set_attr.total_bytes; |
| 420 | void *attr_last; |
| 421 | int ret; |
| 422 | |
| 423 | if (or->attributes_mode && |
| 424 | or->attributes_mode != OSD_CDB_GET_SET_ATTR_LISTS) { |
| 425 | WARN_ON(1); |
| 426 | return -EINVAL; |
| 427 | } |
| 428 | or->attributes_mode = OSD_CDB_GET_SET_ATTR_LISTS; |
| 429 | |
| 430 | if (!total_bytes) { /* first-time: allocate and put list header */ |
| 431 | total_bytes = _osd_req_sizeof_alist_header(or); |
| 432 | ret = _alloc_set_attr_list(or, oa, nelem, total_bytes); |
| 433 | if (ret) |
| 434 | return ret; |
| 435 | _osd_req_set_alist_type(or, or->set_attr.buff, |
| 436 | OSD_ATTR_LIST_SET_RETRIEVE); |
| 437 | } |
| 438 | attr_last = or->set_attr.buff + total_bytes; |
| 439 | |
| 440 | for (; nelem; --nelem) { |
| 441 | struct osd_attributes_list_element *attr; |
| 442 | unsigned elem_size = _osd_req_alist_elem_size(or, oa->len); |
| 443 | |
| 444 | total_bytes += elem_size; |
| 445 | if (unlikely(or->set_attr.alloc_size < total_bytes)) { |
| 446 | or->set_attr.total_bytes = total_bytes - elem_size; |
| 447 | ret = _alloc_set_attr_list(or, oa, nelem, total_bytes); |
| 448 | if (ret) |
| 449 | return ret; |
| 450 | attr_last = |
| 451 | or->set_attr.buff + or->set_attr.total_bytes; |
| 452 | } |
| 453 | |
| 454 | attr = attr_last; |
| 455 | attr->attr_page = cpu_to_be32(oa->attr_page); |
| 456 | attr->attr_id = cpu_to_be32(oa->attr_id); |
| 457 | attr->attr_bytes = cpu_to_be16(oa->len); |
| 458 | memcpy(attr->attr_val, oa->val_ptr, oa->len); |
| 459 | |
| 460 | attr_last += elem_size; |
| 461 | ++oa; |
| 462 | } |
| 463 | |
| 464 | or->set_attr.total_bytes = total_bytes; |
| 465 | return 0; |
| 466 | } |
| 467 | EXPORT_SYMBOL(osd_req_add_set_attr_list); |
| 468 | |
| 469 | static int _append_map_kern(struct request *req, |
| 470 | void *buff, unsigned len, gfp_t flags) |
| 471 | { |
| 472 | struct bio *bio; |
| 473 | int ret; |
| 474 | |
| 475 | bio = bio_map_kern(req->q, buff, len, flags); |
| 476 | if (IS_ERR(bio)) { |
| 477 | OSD_ERR("Failed bio_map_kern(%p, %d) => %ld\n", buff, len, |
| 478 | PTR_ERR(bio)); |
| 479 | return PTR_ERR(bio); |
| 480 | } |
| 481 | ret = blk_rq_append_bio(req->q, req, bio); |
| 482 | if (ret) { |
| 483 | OSD_ERR("Failed blk_rq_append_bio(%p) => %d\n", bio, ret); |
| 484 | bio_put(bio); |
| 485 | } |
| 486 | return ret; |
| 487 | } |
| 488 | |
| 489 | static int _req_append_segment(struct osd_request *or, |
| 490 | unsigned padding, struct _osd_req_data_segment *seg, |
| 491 | struct _osd_req_data_segment *last_seg, struct _osd_io_info *io) |
| 492 | { |
| 493 | void *pad_buff; |
| 494 | int ret; |
| 495 | |
| 496 | if (padding) { |
| 497 | /* check if we can just add it to last buffer */ |
| 498 | if (last_seg && |
| 499 | (padding <= last_seg->alloc_size - last_seg->total_bytes)) |
| 500 | pad_buff = last_seg->buff + last_seg->total_bytes; |
| 501 | else |
| 502 | pad_buff = io->pad_buff; |
| 503 | |
| 504 | ret = _append_map_kern(io->req, pad_buff, padding, |
| 505 | or->alloc_flags); |
| 506 | if (ret) |
| 507 | return ret; |
| 508 | io->total_bytes += padding; |
| 509 | } |
| 510 | |
| 511 | ret = _append_map_kern(io->req, seg->buff, seg->total_bytes, |
| 512 | or->alloc_flags); |
| 513 | if (ret) |
| 514 | return ret; |
| 515 | |
| 516 | io->total_bytes += seg->total_bytes; |
| 517 | OSD_DEBUG("padding=%d buff=%p total_bytes=%d\n", padding, seg->buff, |
| 518 | seg->total_bytes); |
| 519 | return 0; |
| 520 | } |
| 521 | |
| 522 | static int _osd_req_finalize_set_attr_list(struct osd_request *or) |
| 523 | { |
| 524 | struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb); |
| 525 | unsigned padding; |
| 526 | int ret; |
| 527 | |
| 528 | if (!or->set_attr.total_bytes) { |
| 529 | cdbh->attrs_list.set_attr_offset = OSD_OFFSET_UNUSED; |
| 530 | return 0; |
| 531 | } |
| 532 | |
| 533 | cdbh->attrs_list.set_attr_bytes = cpu_to_be32(or->set_attr.total_bytes); |
| 534 | cdbh->attrs_list.set_attr_offset = |
| 535 | osd_req_encode_offset(or, or->out.total_bytes, &padding); |
| 536 | |
| 537 | ret = _req_append_segment(or, padding, &or->set_attr, |
| 538 | or->out.last_seg, &or->out); |
| 539 | if (ret) |
| 540 | return ret; |
| 541 | |
| 542 | or->out.last_seg = &or->set_attr; |
| 543 | return 0; |
| 544 | } |
| 545 | |
| 546 | int osd_req_add_get_attr_list(struct osd_request *or, |
| 547 | const struct osd_attr *oa, unsigned nelem) |
| 548 | { |
| 549 | unsigned total_bytes = or->enc_get_attr.total_bytes; |
| 550 | void *attr_last; |
| 551 | int ret; |
| 552 | |
| 553 | if (or->attributes_mode && |
| 554 | or->attributes_mode != OSD_CDB_GET_SET_ATTR_LISTS) { |
| 555 | WARN_ON(1); |
| 556 | return -EINVAL; |
| 557 | } |
| 558 | or->attributes_mode = OSD_CDB_GET_SET_ATTR_LISTS; |
| 559 | |
| 560 | /* first time calc data-in list header size */ |
| 561 | if (!or->get_attr.total_bytes) |
| 562 | or->get_attr.total_bytes = _osd_req_sizeof_alist_header(or); |
| 563 | |
| 564 | /* calc data-out info */ |
| 565 | if (!total_bytes) { /* first-time: allocate and put list header */ |
| 566 | unsigned max_bytes; |
| 567 | |
| 568 | total_bytes = _osd_req_sizeof_alist_header(or); |
| 569 | max_bytes = total_bytes + |
| 570 | nelem * sizeof(struct osd_attributes_list_attrid); |
| 571 | ret = _alloc_get_attr_desc(or, max_bytes); |
| 572 | if (ret) |
| 573 | return ret; |
| 574 | |
| 575 | _osd_req_set_alist_type(or, or->enc_get_attr.buff, |
| 576 | OSD_ATTR_LIST_GET); |
| 577 | } |
| 578 | attr_last = or->enc_get_attr.buff + total_bytes; |
| 579 | |
| 580 | for (; nelem; --nelem) { |
| 581 | struct osd_attributes_list_attrid *attrid; |
| 582 | const unsigned cur_size = sizeof(*attrid); |
| 583 | |
| 584 | total_bytes += cur_size; |
| 585 | if (unlikely(or->enc_get_attr.alloc_size < total_bytes)) { |
| 586 | or->enc_get_attr.total_bytes = total_bytes - cur_size; |
| 587 | ret = _alloc_get_attr_desc(or, |
| 588 | total_bytes + nelem * sizeof(*attrid)); |
| 589 | if (ret) |
| 590 | return ret; |
| 591 | attr_last = or->enc_get_attr.buff + |
| 592 | or->enc_get_attr.total_bytes; |
| 593 | } |
| 594 | |
| 595 | attrid = attr_last; |
| 596 | attrid->attr_page = cpu_to_be32(oa->attr_page); |
| 597 | attrid->attr_id = cpu_to_be32(oa->attr_id); |
| 598 | |
| 599 | attr_last += cur_size; |
| 600 | |
| 601 | /* calc data-in size */ |
| 602 | or->get_attr.total_bytes += |
| 603 | _osd_req_alist_elem_size(or, oa->len); |
| 604 | ++oa; |
| 605 | } |
| 606 | |
| 607 | or->enc_get_attr.total_bytes = total_bytes; |
| 608 | |
| 609 | OSD_DEBUG( |
| 610 | "get_attr.total_bytes=%u(%u) enc_get_attr.total_bytes=%u(%Zu)\n", |
| 611 | or->get_attr.total_bytes, |
| 612 | or->get_attr.total_bytes - _osd_req_sizeof_alist_header(or), |
| 613 | or->enc_get_attr.total_bytes, |
| 614 | (or->enc_get_attr.total_bytes - _osd_req_sizeof_alist_header(or)) |
| 615 | / sizeof(struct osd_attributes_list_attrid)); |
| 616 | |
| 617 | return 0; |
| 618 | } |
| 619 | EXPORT_SYMBOL(osd_req_add_get_attr_list); |
| 620 | |
| 621 | static int _osd_req_finalize_get_attr_list(struct osd_request *or) |
| 622 | { |
| 623 | struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb); |
| 624 | unsigned out_padding; |
| 625 | unsigned in_padding; |
| 626 | int ret; |
| 627 | |
| 628 | if (!or->enc_get_attr.total_bytes) { |
| 629 | cdbh->attrs_list.get_attr_desc_offset = OSD_OFFSET_UNUSED; |
| 630 | cdbh->attrs_list.get_attr_offset = OSD_OFFSET_UNUSED; |
| 631 | return 0; |
| 632 | } |
| 633 | |
| 634 | ret = _alloc_get_attr_list(or); |
| 635 | if (ret) |
| 636 | return ret; |
| 637 | |
| 638 | /* The out-going buffer info update */ |
| 639 | OSD_DEBUG("out-going\n"); |
| 640 | cdbh->attrs_list.get_attr_desc_bytes = |
| 641 | cpu_to_be32(or->enc_get_attr.total_bytes); |
| 642 | |
| 643 | cdbh->attrs_list.get_attr_desc_offset = |
| 644 | osd_req_encode_offset(or, or->out.total_bytes, &out_padding); |
| 645 | |
| 646 | ret = _req_append_segment(or, out_padding, &or->enc_get_attr, |
| 647 | or->out.last_seg, &or->out); |
| 648 | if (ret) |
| 649 | return ret; |
| 650 | or->out.last_seg = &or->enc_get_attr; |
| 651 | |
| 652 | /* The incoming buffer info update */ |
| 653 | OSD_DEBUG("in-coming\n"); |
| 654 | cdbh->attrs_list.get_attr_alloc_length = |
| 655 | cpu_to_be32(or->get_attr.total_bytes); |
| 656 | |
| 657 | cdbh->attrs_list.get_attr_offset = |
| 658 | osd_req_encode_offset(or, or->in.total_bytes, &in_padding); |
| 659 | |
| 660 | ret = _req_append_segment(or, in_padding, &or->get_attr, NULL, |
| 661 | &or->in); |
| 662 | if (ret) |
| 663 | return ret; |
| 664 | or->in.last_seg = &or->get_attr; |
| 665 | |
| 666 | return 0; |
| 667 | } |
| 668 | |
| 669 | int osd_req_decode_get_attr_list(struct osd_request *or, |
| 670 | struct osd_attr *oa, int *nelem, void **iterator) |
| 671 | { |
| 672 | unsigned cur_bytes, returned_bytes; |
| 673 | int n; |
| 674 | const unsigned sizeof_attr_list = _osd_req_sizeof_alist_header(or); |
| 675 | void *cur_p; |
| 676 | |
| 677 | if (!_osd_req_is_alist_type(or, or->get_attr.buff, |
| 678 | OSD_ATTR_LIST_SET_RETRIEVE)) { |
| 679 | oa->attr_page = 0; |
| 680 | oa->attr_id = 0; |
| 681 | oa->val_ptr = NULL; |
| 682 | oa->len = 0; |
| 683 | *iterator = NULL; |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | if (*iterator) { |
| 688 | BUG_ON((*iterator < or->get_attr.buff) || |
| 689 | (or->get_attr.buff + or->get_attr.alloc_size < *iterator)); |
| 690 | cur_p = *iterator; |
| 691 | cur_bytes = (*iterator - or->get_attr.buff) - sizeof_attr_list; |
| 692 | returned_bytes = or->get_attr.total_bytes; |
| 693 | } else { /* first time decode the list header */ |
| 694 | cur_bytes = sizeof_attr_list; |
| 695 | returned_bytes = _osd_req_alist_size(or, or->get_attr.buff) + |
| 696 | sizeof_attr_list; |
| 697 | |
| 698 | cur_p = or->get_attr.buff + sizeof_attr_list; |
| 699 | |
| 700 | if (returned_bytes > or->get_attr.alloc_size) { |
| 701 | OSD_DEBUG("target report: space was not big enough! " |
| 702 | "Allocate=%u Needed=%u\n", |
| 703 | or->get_attr.alloc_size, |
| 704 | returned_bytes + sizeof_attr_list); |
| 705 | |
| 706 | returned_bytes = |
| 707 | or->get_attr.alloc_size - sizeof_attr_list; |
| 708 | } |
| 709 | or->get_attr.total_bytes = returned_bytes; |
| 710 | } |
| 711 | |
| 712 | for (n = 0; (n < *nelem) && (cur_bytes < returned_bytes); ++n) { |
| 713 | struct osd_attributes_list_element *attr = cur_p; |
| 714 | unsigned inc; |
| 715 | |
| 716 | oa->len = be16_to_cpu(attr->attr_bytes); |
| 717 | inc = _osd_req_alist_elem_size(or, oa->len); |
| 718 | OSD_DEBUG("oa->len=%d inc=%d cur_bytes=%d\n", |
| 719 | oa->len, inc, cur_bytes); |
| 720 | cur_bytes += inc; |
| 721 | if (cur_bytes > returned_bytes) { |
| 722 | OSD_ERR("BAD FOOD from target. list not valid!" |
| 723 | "c=%d r=%d n=%d\n", |
| 724 | cur_bytes, returned_bytes, n); |
| 725 | oa->val_ptr = NULL; |
| 726 | break; |
| 727 | } |
| 728 | |
| 729 | oa->attr_page = be32_to_cpu(attr->attr_page); |
| 730 | oa->attr_id = be32_to_cpu(attr->attr_id); |
| 731 | oa->val_ptr = attr->attr_val; |
| 732 | |
| 733 | cur_p += inc; |
| 734 | ++oa; |
| 735 | } |
| 736 | |
| 737 | *iterator = (returned_bytes - cur_bytes) ? cur_p : NULL; |
| 738 | *nelem = n; |
| 739 | return returned_bytes - cur_bytes; |
| 740 | } |
| 741 | EXPORT_SYMBOL(osd_req_decode_get_attr_list); |
| 742 | |
| 743 | /* |
| 744 | * Attributes Page-mode |
| 745 | */ |
| 746 | |
| 747 | int osd_req_add_get_attr_page(struct osd_request *or, |
| 748 | u32 page_id, void *attar_page, unsigned max_page_len, |
| 749 | const struct osd_attr *set_one_attr) |
| 750 | { |
| 751 | struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb); |
| 752 | |
| 753 | if (or->attributes_mode && |
| 754 | or->attributes_mode != OSD_CDB_GET_ATTR_PAGE_SET_ONE) { |
| 755 | WARN_ON(1); |
| 756 | return -EINVAL; |
| 757 | } |
| 758 | or->attributes_mode = OSD_CDB_GET_ATTR_PAGE_SET_ONE; |
| 759 | |
| 760 | or->get_attr.buff = attar_page; |
| 761 | or->get_attr.total_bytes = max_page_len; |
| 762 | |
| 763 | or->set_attr.buff = set_one_attr->val_ptr; |
| 764 | or->set_attr.total_bytes = set_one_attr->len; |
| 765 | |
| 766 | cdbh->attrs_page.get_attr_page = cpu_to_be32(page_id); |
| 767 | cdbh->attrs_page.get_attr_alloc_length = cpu_to_be32(max_page_len); |
| 768 | /* ocdb->attrs_page.get_attr_offset; */ |
| 769 | |
| 770 | cdbh->attrs_page.set_attr_page = cpu_to_be32(set_one_attr->attr_page); |
| 771 | cdbh->attrs_page.set_attr_id = cpu_to_be32(set_one_attr->attr_id); |
| 772 | cdbh->attrs_page.set_attr_length = cpu_to_be32(set_one_attr->len); |
| 773 | /* ocdb->attrs_page.set_attr_offset; */ |
| 774 | return 0; |
| 775 | } |
| 776 | EXPORT_SYMBOL(osd_req_add_get_attr_page); |
| 777 | |
| 778 | static int _osd_req_finalize_attr_page(struct osd_request *or) |
| 779 | { |
| 780 | struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb); |
| 781 | unsigned in_padding, out_padding; |
| 782 | int ret; |
| 783 | |
| 784 | /* returned page */ |
| 785 | cdbh->attrs_page.get_attr_offset = |
| 786 | osd_req_encode_offset(or, or->in.total_bytes, &in_padding); |
| 787 | |
| 788 | ret = _req_append_segment(or, in_padding, &or->get_attr, NULL, |
| 789 | &or->in); |
| 790 | if (ret) |
| 791 | return ret; |
| 792 | |
| 793 | /* set one value */ |
| 794 | cdbh->attrs_page.set_attr_offset = |
| 795 | osd_req_encode_offset(or, or->out.total_bytes, &out_padding); |
| 796 | |
| 797 | ret = _req_append_segment(or, out_padding, &or->enc_get_attr, NULL, |
| 798 | &or->out); |
| 799 | return ret; |
| 800 | } |
| 801 | |
Boaz Harrosh | 02941a5 | 2009-01-25 16:55:30 +0200 | [diff] [blame] | 802 | /* |
| 803 | * osd_finalize_request and helpers |
| 804 | */ |
| 805 | |
| 806 | static int _init_blk_request(struct osd_request *or, |
| 807 | bool has_in, bool has_out) |
| 808 | { |
| 809 | gfp_t flags = or->alloc_flags; |
| 810 | struct scsi_device *scsi_device = or->osd_dev->scsi_device; |
| 811 | struct request_queue *q = scsi_device->request_queue; |
| 812 | struct request *req; |
| 813 | int ret = -ENOMEM; |
| 814 | |
| 815 | req = blk_get_request(q, has_out, flags); |
| 816 | if (!req) |
| 817 | goto out; |
| 818 | |
| 819 | or->request = req; |
| 820 | req->cmd_type = REQ_TYPE_BLOCK_PC; |
| 821 | req->timeout = or->timeout; |
| 822 | req->retries = or->retries; |
| 823 | req->sense = or->sense; |
| 824 | req->sense_len = 0; |
| 825 | |
| 826 | if (has_out) { |
| 827 | or->out.req = req; |
| 828 | if (has_in) { |
| 829 | /* allocate bidi request */ |
| 830 | req = blk_get_request(q, READ, flags); |
| 831 | if (!req) { |
| 832 | OSD_DEBUG("blk_get_request for bidi failed\n"); |
| 833 | goto out; |
| 834 | } |
| 835 | req->cmd_type = REQ_TYPE_BLOCK_PC; |
| 836 | or->in.req = or->request->next_rq = req; |
| 837 | } |
| 838 | } else if (has_in) |
| 839 | or->in.req = req; |
| 840 | |
| 841 | ret = 0; |
| 842 | out: |
| 843 | OSD_DEBUG("or=%p has_in=%d has_out=%d => %d, %p\n", |
| 844 | or, has_in, has_out, ret, or->request); |
| 845 | return ret; |
| 846 | } |
| 847 | |
| 848 | int osd_finalize_request(struct osd_request *or, |
| 849 | u8 options, const void *cap, const u8 *cap_key) |
| 850 | { |
| 851 | struct osd_cdb_head *cdbh = osd_cdb_head(&or->cdb); |
| 852 | bool has_in, has_out; |
| 853 | int ret; |
| 854 | |
| 855 | if (options & OSD_REQ_FUA) |
| 856 | cdbh->options |= OSD_CDB_FUA; |
| 857 | |
| 858 | if (options & OSD_REQ_DPO) |
| 859 | cdbh->options |= OSD_CDB_DPO; |
| 860 | |
| 861 | if (options & OSD_REQ_BYPASS_TIMESTAMPS) |
| 862 | cdbh->timestamp_control = OSD_CDB_BYPASS_TIMESTAMPS; |
| 863 | |
| 864 | osd_set_caps(&or->cdb, cap); |
| 865 | |
| 866 | has_in = or->in.bio || or->get_attr.total_bytes; |
| 867 | has_out = or->out.bio || or->set_attr.total_bytes || |
| 868 | or->enc_get_attr.total_bytes; |
| 869 | |
| 870 | ret = _init_blk_request(or, has_in, has_out); |
| 871 | if (ret) { |
| 872 | OSD_DEBUG("_init_blk_request failed\n"); |
| 873 | return ret; |
| 874 | } |
| 875 | |
| 876 | if (or->out.bio) { |
| 877 | ret = blk_rq_append_bio(or->request->q, or->out.req, |
| 878 | or->out.bio); |
| 879 | if (ret) { |
| 880 | OSD_DEBUG("blk_rq_append_bio out failed\n"); |
| 881 | return ret; |
| 882 | } |
| 883 | OSD_DEBUG("out bytes=%llu (bytes_req=%u)\n", |
| 884 | _LLU(or->out.total_bytes), or->out.req->data_len); |
| 885 | } |
| 886 | if (or->in.bio) { |
| 887 | ret = blk_rq_append_bio(or->request->q, or->in.req, or->in.bio); |
| 888 | if (ret) { |
| 889 | OSD_DEBUG("blk_rq_append_bio in failed\n"); |
| 890 | return ret; |
| 891 | } |
| 892 | OSD_DEBUG("in bytes=%llu (bytes_req=%u)\n", |
| 893 | _LLU(or->in.total_bytes), or->in.req->data_len); |
| 894 | } |
| 895 | |
Boaz Harrosh | 4ef1a3d | 2009-01-25 16:59:50 +0200 | [diff] [blame^] | 896 | or->out.pad_buff = sg_out_pad_buffer; |
| 897 | or->in.pad_buff = sg_in_pad_buffer; |
| 898 | |
Boaz Harrosh | 02941a5 | 2009-01-25 16:55:30 +0200 | [diff] [blame] | 899 | if (!or->attributes_mode) |
| 900 | or->attributes_mode = OSD_CDB_GET_SET_ATTR_LISTS; |
| 901 | cdbh->command_specific_options |= or->attributes_mode; |
Boaz Harrosh | 4ef1a3d | 2009-01-25 16:59:50 +0200 | [diff] [blame^] | 902 | if (or->attributes_mode == OSD_CDB_GET_ATTR_PAGE_SET_ONE) { |
| 903 | ret = _osd_req_finalize_attr_page(or); |
| 904 | } else { |
| 905 | /* TODO: I think that for the GET_ATTR command these 2 should |
| 906 | * be reversed to keep them in execution order (for embeded |
| 907 | * targets with low memory footprint) |
| 908 | */ |
| 909 | ret = _osd_req_finalize_set_attr_list(or); |
| 910 | if (ret) { |
| 911 | OSD_DEBUG("_osd_req_finalize_set_attr_list failed\n"); |
| 912 | return ret; |
| 913 | } |
| 914 | |
| 915 | ret = _osd_req_finalize_get_attr_list(or); |
| 916 | if (ret) { |
| 917 | OSD_DEBUG("_osd_req_finalize_get_attr_list failed\n"); |
| 918 | return ret; |
| 919 | } |
| 920 | } |
Boaz Harrosh | 02941a5 | 2009-01-25 16:55:30 +0200 | [diff] [blame] | 921 | |
| 922 | or->request->cmd = or->cdb.buff; |
| 923 | or->request->cmd_len = _osd_req_cdb_len(or); |
| 924 | |
| 925 | return 0; |
| 926 | } |
| 927 | EXPORT_SYMBOL(osd_finalize_request); |
| 928 | |
| 929 | /* |
| 930 | * Implementation of osd_sec.h API |
| 931 | * TODO: Move to a separate osd_sec.c file at a later stage. |
| 932 | */ |
| 933 | |
| 934 | enum { OSD_SEC_CAP_V1_ALL_CAPS = |
| 935 | OSD_SEC_CAP_APPEND | OSD_SEC_CAP_OBJ_MGMT | OSD_SEC_CAP_REMOVE | |
| 936 | OSD_SEC_CAP_CREATE | OSD_SEC_CAP_SET_ATTR | OSD_SEC_CAP_GET_ATTR | |
| 937 | OSD_SEC_CAP_WRITE | OSD_SEC_CAP_READ | OSD_SEC_CAP_POL_SEC | |
| 938 | OSD_SEC_CAP_GLOBAL | OSD_SEC_CAP_DEV_MGMT |
| 939 | }; |
| 940 | |
| 941 | void osd_sec_init_nosec_doall_caps(void *caps, |
| 942 | const struct osd_obj_id *obj, bool is_collection, const bool is_v1) |
| 943 | { |
| 944 | struct osd_capability *cap = caps; |
| 945 | u8 type; |
| 946 | u8 descriptor_type; |
| 947 | |
| 948 | if (likely(obj->id)) { |
| 949 | if (unlikely(is_collection)) { |
| 950 | type = OSD_SEC_OBJ_COLLECTION; |
| 951 | descriptor_type = is_v1 ? OSD_SEC_OBJ_DESC_OBJ : |
| 952 | OSD_SEC_OBJ_DESC_COL; |
| 953 | } else { |
| 954 | type = OSD_SEC_OBJ_USER; |
| 955 | descriptor_type = OSD_SEC_OBJ_DESC_OBJ; |
| 956 | } |
| 957 | WARN_ON(!obj->partition); |
| 958 | } else { |
| 959 | type = obj->partition ? OSD_SEC_OBJ_PARTITION : |
| 960 | OSD_SEC_OBJ_ROOT; |
| 961 | descriptor_type = OSD_SEC_OBJ_DESC_PAR; |
| 962 | } |
| 963 | |
| 964 | memset(cap, 0, sizeof(*cap)); |
| 965 | |
| 966 | cap->h.format = OSD_SEC_CAP_FORMAT_VER1; |
| 967 | cap->h.integrity_algorithm__key_version = 0; /* MAKE_BYTE(0, 0); */ |
| 968 | cap->h.security_method = OSD_SEC_NOSEC; |
| 969 | /* cap->expiration_time; |
| 970 | cap->AUDIT[30-10]; |
| 971 | cap->discriminator[42-30]; |
| 972 | cap->object_created_time; */ |
| 973 | cap->h.object_type = type; |
| 974 | osd_sec_set_caps(&cap->h, OSD_SEC_CAP_V1_ALL_CAPS); |
| 975 | cap->h.object_descriptor_type = descriptor_type; |
| 976 | cap->od.obj_desc.policy_access_tag = 0; |
| 977 | cap->od.obj_desc.allowed_partition_id = cpu_to_be64(obj->partition); |
| 978 | cap->od.obj_desc.allowed_object_id = cpu_to_be64(obj->id); |
| 979 | } |
| 980 | EXPORT_SYMBOL(osd_sec_init_nosec_doall_caps); |
| 981 | |
| 982 | void osd_set_caps(struct osd_cdb *cdb, const void *caps) |
| 983 | { |
| 984 | memcpy(&cdb->v1.caps, caps, OSDv1_CAP_LEN); |
| 985 | } |
Boaz Harrosh | 4ef1a3d | 2009-01-25 16:59:50 +0200 | [diff] [blame^] | 986 | |
| 987 | /* |
| 988 | * Declared in osd_protocol.h |
| 989 | * 4.12.5 Data-In and Data-Out buffer offsets |
| 990 | * byte offset = mantissa * (2^(exponent+8)) |
| 991 | * Returns the smallest allowed encoded offset that contains given @offset |
| 992 | * The actual encoded offset returned is @offset + *@padding. |
| 993 | */ |
| 994 | osd_cdb_offset __osd_encode_offset( |
| 995 | u64 offset, unsigned *padding, int min_shift, int max_shift) |
| 996 | { |
| 997 | u64 try_offset = -1, mod, align; |
| 998 | osd_cdb_offset be32_offset; |
| 999 | int shift; |
| 1000 | |
| 1001 | *padding = 0; |
| 1002 | if (!offset) |
| 1003 | return 0; |
| 1004 | |
| 1005 | for (shift = min_shift; shift < max_shift; ++shift) { |
| 1006 | try_offset = offset >> shift; |
| 1007 | if (try_offset < (1 << OSD_OFFSET_MAX_BITS)) |
| 1008 | break; |
| 1009 | } |
| 1010 | |
| 1011 | BUG_ON(shift == max_shift); |
| 1012 | |
| 1013 | align = 1 << shift; |
| 1014 | mod = offset & (align - 1); |
| 1015 | if (mod) { |
| 1016 | *padding = align - mod; |
| 1017 | try_offset += 1; |
| 1018 | } |
| 1019 | |
| 1020 | try_offset |= ((shift - 8) & 0xf) << 28; |
| 1021 | be32_offset = cpu_to_be32((u32)try_offset); |
| 1022 | |
| 1023 | OSD_DEBUG("offset=%llu mantissa=%llu exp=%d encoded=%x pad=%d\n", |
| 1024 | _LLU(offset), _LLU(try_offset & 0x0FFFFFFF), shift, |
| 1025 | be32_offset, *padding); |
| 1026 | return be32_offset; |
| 1027 | } |