Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * Filename: target_core_iblock.c |
| 3 | * |
| 4 | * This file contains the Storage Engine <-> Linux BlockIO transport |
| 5 | * specific functions. |
| 6 | * |
| 7 | * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc. |
| 8 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. |
| 9 | * Copyright (c) 2007-2010 Rising Tide Systems |
| 10 | * Copyright (c) 2008-2010 Linux-iSCSI.org |
| 11 | * |
| 12 | * Nicholas A. Bellinger <nab@kernel.org> |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * This program is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with this program; if not, write to the Free Software |
| 26 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 27 | * |
| 28 | ******************************************************************************/ |
| 29 | |
| 30 | #include <linux/version.h> |
| 31 | #include <linux/string.h> |
| 32 | #include <linux/parser.h> |
| 33 | #include <linux/timer.h> |
| 34 | #include <linux/fs.h> |
| 35 | #include <linux/blkdev.h> |
| 36 | #include <linux/slab.h> |
| 37 | #include <linux/spinlock.h> |
| 38 | #include <linux/smp_lock.h> |
| 39 | #include <linux/bio.h> |
| 40 | #include <linux/genhd.h> |
| 41 | #include <linux/file.h> |
| 42 | #include <scsi/scsi.h> |
| 43 | #include <scsi/scsi_host.h> |
| 44 | |
| 45 | #include <target/target_core_base.h> |
| 46 | #include <target/target_core_device.h> |
| 47 | #include <target/target_core_transport.h> |
| 48 | |
| 49 | #include "target_core_iblock.h" |
| 50 | |
| 51 | #if 0 |
| 52 | #define DEBUG_IBLOCK(x...) printk(x) |
| 53 | #else |
| 54 | #define DEBUG_IBLOCK(x...) |
| 55 | #endif |
| 56 | |
| 57 | static struct se_subsystem_api iblock_template; |
| 58 | |
| 59 | static void iblock_bio_done(struct bio *, int); |
| 60 | |
| 61 | /* iblock_attach_hba(): (Part of se_subsystem_api_t template) |
| 62 | * |
| 63 | * |
| 64 | */ |
| 65 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) |
| 66 | { |
| 67 | struct iblock_hba *ib_host; |
| 68 | |
| 69 | ib_host = kzalloc(sizeof(struct iblock_hba), GFP_KERNEL); |
| 70 | if (!(ib_host)) { |
| 71 | printk(KERN_ERR "Unable to allocate memory for" |
| 72 | " struct iblock_hba\n"); |
| 73 | return -ENOMEM; |
| 74 | } |
| 75 | |
| 76 | ib_host->iblock_host_id = host_id; |
| 77 | |
| 78 | atomic_set(&hba->left_queue_depth, IBLOCK_HBA_QUEUE_DEPTH); |
| 79 | atomic_set(&hba->max_queue_depth, IBLOCK_HBA_QUEUE_DEPTH); |
| 80 | hba->hba_ptr = (void *) ib_host; |
| 81 | |
| 82 | printk(KERN_INFO "CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
| 83 | " Generic Target Core Stack %s\n", hba->hba_id, |
| 84 | IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); |
| 85 | |
| 86 | printk(KERN_INFO "CORE_HBA[%d] - Attached iBlock HBA: %u to Generic" |
| 87 | " Target Core TCQ Depth: %d\n", hba->hba_id, |
| 88 | ib_host->iblock_host_id, atomic_read(&hba->max_queue_depth)); |
| 89 | |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static void iblock_detach_hba(struct se_hba *hba) |
| 94 | { |
| 95 | struct iblock_hba *ib_host = hba->hba_ptr; |
| 96 | |
| 97 | printk(KERN_INFO "CORE_HBA[%d] - Detached iBlock HBA: %u from Generic" |
| 98 | " Target Core\n", hba->hba_id, ib_host->iblock_host_id); |
| 99 | |
| 100 | kfree(ib_host); |
| 101 | hba->hba_ptr = NULL; |
| 102 | } |
| 103 | |
| 104 | static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name) |
| 105 | { |
| 106 | struct iblock_dev *ib_dev = NULL; |
| 107 | struct iblock_hba *ib_host = hba->hba_ptr; |
| 108 | |
| 109 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); |
| 110 | if (!(ib_dev)) { |
| 111 | printk(KERN_ERR "Unable to allocate struct iblock_dev\n"); |
| 112 | return NULL; |
| 113 | } |
| 114 | ib_dev->ibd_host = ib_host; |
| 115 | |
| 116 | printk(KERN_INFO "IBLOCK: Allocated ib_dev for %s\n", name); |
| 117 | |
| 118 | return ib_dev; |
| 119 | } |
| 120 | |
| 121 | static struct se_device *iblock_create_virtdevice( |
| 122 | struct se_hba *hba, |
| 123 | struct se_subsystem_dev *se_dev, |
| 124 | void *p) |
| 125 | { |
| 126 | struct iblock_dev *ib_dev = p; |
| 127 | struct se_device *dev; |
| 128 | struct se_dev_limits dev_limits; |
| 129 | struct block_device *bd = NULL; |
| 130 | struct request_queue *q; |
| 131 | struct queue_limits *limits; |
| 132 | u32 dev_flags = 0; |
| 133 | |
| 134 | if (!(ib_dev)) { |
| 135 | printk(KERN_ERR "Unable to locate struct iblock_dev parameter\n"); |
| 136 | return 0; |
| 137 | } |
| 138 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); |
| 139 | /* |
| 140 | * These settings need to be made tunable.. |
| 141 | */ |
| 142 | ib_dev->ibd_bio_set = bioset_create(32, 64); |
| 143 | if (!(ib_dev->ibd_bio_set)) { |
| 144 | printk(KERN_ERR "IBLOCK: Unable to create bioset()\n"); |
| 145 | return 0; |
| 146 | } |
| 147 | printk(KERN_INFO "IBLOCK: Created bio_set()\n"); |
| 148 | /* |
| 149 | * iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path |
| 150 | * must already have been set in order for echo 1 > $HBA/$DEV/enable to run. |
| 151 | */ |
| 152 | printk(KERN_INFO "IBLOCK: Claiming struct block_device: %s\n", |
| 153 | ib_dev->ibd_udev_path); |
| 154 | |
| 155 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, |
| 156 | FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev); |
Dan Carpenter | 3ae279d | 2011-02-09 15:34:36 -0800 | [diff] [blame] | 157 | if (IS_ERR(bd)) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 158 | goto failed; |
| 159 | /* |
| 160 | * Setup the local scope queue_limits from struct request_queue->limits |
| 161 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. |
| 162 | */ |
| 163 | q = bdev_get_queue(bd); |
| 164 | limits = &dev_limits.limits; |
| 165 | limits->logical_block_size = bdev_logical_block_size(bd); |
| 166 | limits->max_hw_sectors = queue_max_hw_sectors(q); |
| 167 | limits->max_sectors = queue_max_sectors(q); |
| 168 | dev_limits.hw_queue_depth = IBLOCK_MAX_DEVICE_QUEUE_DEPTH; |
| 169 | dev_limits.queue_depth = IBLOCK_DEVICE_QUEUE_DEPTH; |
| 170 | |
| 171 | ib_dev->ibd_major = MAJOR(bd->bd_dev); |
| 172 | ib_dev->ibd_minor = MINOR(bd->bd_dev); |
| 173 | ib_dev->ibd_bd = bd; |
| 174 | |
| 175 | dev = transport_add_device_to_core_hba(hba, |
| 176 | &iblock_template, se_dev, dev_flags, (void *)ib_dev, |
| 177 | &dev_limits, "IBLOCK", IBLOCK_VERSION); |
| 178 | if (!(dev)) |
| 179 | goto failed; |
| 180 | |
| 181 | ib_dev->ibd_depth = dev->queue_depth; |
| 182 | |
| 183 | /* |
| 184 | * Check if the underlying struct block_device request_queue supports |
| 185 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM |
| 186 | * in ATA and we need to set TPE=1 |
| 187 | */ |
| 188 | if (blk_queue_discard(bdev_get_queue(bd))) { |
| 189 | struct request_queue *q = bdev_get_queue(bd); |
| 190 | |
| 191 | DEV_ATTRIB(dev)->max_unmap_lba_count = |
| 192 | q->limits.max_discard_sectors; |
| 193 | /* |
| 194 | * Currently hardcoded to 1 in Linux/SCSI code.. |
| 195 | */ |
| 196 | DEV_ATTRIB(dev)->max_unmap_block_desc_count = 1; |
| 197 | DEV_ATTRIB(dev)->unmap_granularity = |
| 198 | q->limits.discard_granularity; |
| 199 | DEV_ATTRIB(dev)->unmap_granularity_alignment = |
| 200 | q->limits.discard_alignment; |
| 201 | |
| 202 | printk(KERN_INFO "IBLOCK: BLOCK Discard support available," |
| 203 | " disabled by default\n"); |
| 204 | } |
| 205 | |
| 206 | return dev; |
| 207 | |
| 208 | failed: |
| 209 | if (ib_dev->ibd_bio_set) { |
| 210 | bioset_free(ib_dev->ibd_bio_set); |
| 211 | ib_dev->ibd_bio_set = NULL; |
| 212 | } |
| 213 | ib_dev->ibd_bd = NULL; |
| 214 | ib_dev->ibd_major = 0; |
| 215 | ib_dev->ibd_minor = 0; |
| 216 | return NULL; |
| 217 | } |
| 218 | |
| 219 | static void iblock_free_device(void *p) |
| 220 | { |
| 221 | struct iblock_dev *ib_dev = p; |
| 222 | |
Nicholas Bellinger | bc66552 | 2011-02-09 15:34:38 -0800 | [diff] [blame] | 223 | if (ib_dev->ibd_bd != NULL) |
| 224 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); |
| 225 | if (ib_dev->ibd_bio_set != NULL) |
| 226 | bioset_free(ib_dev->ibd_bio_set); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 227 | kfree(ib_dev); |
| 228 | } |
| 229 | |
| 230 | static inline struct iblock_req *IBLOCK_REQ(struct se_task *task) |
| 231 | { |
| 232 | return container_of(task, struct iblock_req, ib_task); |
| 233 | } |
| 234 | |
| 235 | static struct se_task * |
| 236 | iblock_alloc_task(struct se_cmd *cmd) |
| 237 | { |
| 238 | struct iblock_req *ib_req; |
| 239 | |
| 240 | ib_req = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
| 241 | if (!(ib_req)) { |
| 242 | printk(KERN_ERR "Unable to allocate memory for struct iblock_req\n"); |
| 243 | return NULL; |
| 244 | } |
| 245 | |
| 246 | ib_req->ib_dev = SE_DEV(cmd)->dev_ptr; |
| 247 | atomic_set(&ib_req->ib_bio_cnt, 0); |
| 248 | return &ib_req->ib_task; |
| 249 | } |
| 250 | |
| 251 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
| 252 | struct se_device *dev, |
| 253 | struct block_device *bd, |
| 254 | struct request_queue *q) |
| 255 | { |
| 256 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), |
| 257 | bdev_logical_block_size(bd)) - 1); |
| 258 | u32 block_size = bdev_logical_block_size(bd); |
| 259 | |
| 260 | if (block_size == DEV_ATTRIB(dev)->block_size) |
| 261 | return blocks_long; |
| 262 | |
| 263 | switch (block_size) { |
| 264 | case 4096: |
| 265 | switch (DEV_ATTRIB(dev)->block_size) { |
| 266 | case 2048: |
| 267 | blocks_long <<= 1; |
| 268 | break; |
| 269 | case 1024: |
| 270 | blocks_long <<= 2; |
| 271 | break; |
| 272 | case 512: |
| 273 | blocks_long <<= 3; |
| 274 | default: |
| 275 | break; |
| 276 | } |
| 277 | break; |
| 278 | case 2048: |
| 279 | switch (DEV_ATTRIB(dev)->block_size) { |
| 280 | case 4096: |
| 281 | blocks_long >>= 1; |
| 282 | break; |
| 283 | case 1024: |
| 284 | blocks_long <<= 1; |
| 285 | break; |
| 286 | case 512: |
| 287 | blocks_long <<= 2; |
| 288 | break; |
| 289 | default: |
| 290 | break; |
| 291 | } |
| 292 | break; |
| 293 | case 1024: |
| 294 | switch (DEV_ATTRIB(dev)->block_size) { |
| 295 | case 4096: |
| 296 | blocks_long >>= 2; |
| 297 | break; |
| 298 | case 2048: |
| 299 | blocks_long >>= 1; |
| 300 | break; |
| 301 | case 512: |
| 302 | blocks_long <<= 1; |
| 303 | break; |
| 304 | default: |
| 305 | break; |
| 306 | } |
| 307 | break; |
| 308 | case 512: |
| 309 | switch (DEV_ATTRIB(dev)->block_size) { |
| 310 | case 4096: |
| 311 | blocks_long >>= 3; |
| 312 | break; |
| 313 | case 2048: |
| 314 | blocks_long >>= 2; |
| 315 | break; |
| 316 | case 1024: |
| 317 | blocks_long >>= 1; |
| 318 | break; |
| 319 | default: |
| 320 | break; |
| 321 | } |
| 322 | break; |
| 323 | default: |
| 324 | break; |
| 325 | } |
| 326 | |
| 327 | return blocks_long; |
| 328 | } |
| 329 | |
| 330 | /* |
| 331 | * Emulate SYCHRONIZE_CACHE_* |
| 332 | */ |
| 333 | static void iblock_emulate_sync_cache(struct se_task *task) |
| 334 | { |
| 335 | struct se_cmd *cmd = TASK_CMD(task); |
| 336 | struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; |
| 337 | int immed = (T_TASK(cmd)->t_task_cdb[1] & 0x2); |
| 338 | sector_t error_sector; |
| 339 | int ret; |
| 340 | |
| 341 | /* |
| 342 | * If the Immediate bit is set, queue up the GOOD response |
| 343 | * for this SYNCHRONIZE_CACHE op |
| 344 | */ |
| 345 | if (immed) |
| 346 | transport_complete_sync_cache(cmd, 1); |
| 347 | |
| 348 | /* |
| 349 | * blkdev_issue_flush() does not support a specifying a range, so |
| 350 | * we have to flush the entire cache. |
| 351 | */ |
| 352 | ret = blkdev_issue_flush(ib_dev->ibd_bd, GFP_KERNEL, &error_sector); |
| 353 | if (ret != 0) { |
| 354 | printk(KERN_ERR "IBLOCK: block_issue_flush() failed: %d " |
| 355 | " error_sector: %llu\n", ret, |
| 356 | (unsigned long long)error_sector); |
| 357 | } |
| 358 | |
| 359 | if (!immed) |
| 360 | transport_complete_sync_cache(cmd, ret == 0); |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | * Tell TCM Core that we are capable of WriteCache emulation for |
| 365 | * an underlying struct se_device. |
| 366 | */ |
| 367 | static int iblock_emulated_write_cache(struct se_device *dev) |
| 368 | { |
| 369 | return 1; |
| 370 | } |
| 371 | |
| 372 | static int iblock_emulated_dpo(struct se_device *dev) |
| 373 | { |
| 374 | return 0; |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs |
| 379 | * for TYPE_DISK. |
| 380 | */ |
| 381 | static int iblock_emulated_fua_write(struct se_device *dev) |
| 382 | { |
| 383 | return 1; |
| 384 | } |
| 385 | |
| 386 | static int iblock_emulated_fua_read(struct se_device *dev) |
| 387 | { |
| 388 | return 0; |
| 389 | } |
| 390 | |
| 391 | static int iblock_do_task(struct se_task *task) |
| 392 | { |
| 393 | struct se_device *dev = task->task_se_cmd->se_dev; |
| 394 | struct iblock_req *req = IBLOCK_REQ(task); |
| 395 | struct iblock_dev *ibd = (struct iblock_dev *)req->ib_dev; |
| 396 | struct request_queue *q = bdev_get_queue(ibd->ibd_bd); |
| 397 | struct bio *bio = req->ib_bio, *nbio = NULL; |
| 398 | int rw; |
| 399 | |
| 400 | if (task->task_data_direction == DMA_TO_DEVICE) { |
| 401 | /* |
| 402 | * Force data to disk if we pretend to not have a volatile |
| 403 | * write cache, or the initiator set the Force Unit Access bit. |
| 404 | */ |
| 405 | if (DEV_ATTRIB(dev)->emulate_write_cache == 0 || |
| 406 | (DEV_ATTRIB(dev)->emulate_fua_write > 0 && |
| 407 | T_TASK(task->task_se_cmd)->t_tasks_fua)) |
| 408 | rw = WRITE_FUA; |
| 409 | else |
| 410 | rw = WRITE; |
| 411 | } else { |
| 412 | rw = READ; |
| 413 | } |
| 414 | |
| 415 | while (bio) { |
| 416 | nbio = bio->bi_next; |
| 417 | bio->bi_next = NULL; |
| 418 | DEBUG_IBLOCK("Calling submit_bio() task: %p bio: %p" |
| 419 | " bio->bi_sector: %llu\n", task, bio, bio->bi_sector); |
| 420 | |
| 421 | submit_bio(rw, bio); |
| 422 | bio = nbio; |
| 423 | } |
| 424 | |
| 425 | if (q->unplug_fn) |
| 426 | q->unplug_fn(q); |
| 427 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; |
| 428 | } |
| 429 | |
| 430 | static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range) |
| 431 | { |
| 432 | struct iblock_dev *ibd = dev->dev_ptr; |
| 433 | struct block_device *bd = ibd->ibd_bd; |
| 434 | int barrier = 0; |
| 435 | |
| 436 | return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier); |
| 437 | } |
| 438 | |
| 439 | static void iblock_free_task(struct se_task *task) |
| 440 | { |
| 441 | struct iblock_req *req = IBLOCK_REQ(task); |
| 442 | struct bio *bio, *hbio = req->ib_bio; |
| 443 | /* |
| 444 | * We only release the bio(s) here if iblock_bio_done() has not called |
| 445 | * bio_put() -> iblock_bio_destructor(). |
| 446 | */ |
| 447 | while (hbio != NULL) { |
| 448 | bio = hbio; |
| 449 | hbio = hbio->bi_next; |
| 450 | bio->bi_next = NULL; |
| 451 | bio_put(bio); |
| 452 | } |
| 453 | |
| 454 | kfree(req); |
| 455 | } |
| 456 | |
| 457 | enum { |
| 458 | Opt_udev_path, Opt_force, Opt_err |
| 459 | }; |
| 460 | |
| 461 | static match_table_t tokens = { |
| 462 | {Opt_udev_path, "udev_path=%s"}, |
| 463 | {Opt_force, "force=%d"}, |
| 464 | {Opt_err, NULL} |
| 465 | }; |
| 466 | |
| 467 | static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba, |
| 468 | struct se_subsystem_dev *se_dev, |
| 469 | const char *page, ssize_t count) |
| 470 | { |
| 471 | struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr; |
| 472 | char *orig, *ptr, *opts; |
| 473 | substring_t args[MAX_OPT_ARGS]; |
| 474 | int ret = 0, arg, token; |
| 475 | |
| 476 | opts = kstrdup(page, GFP_KERNEL); |
| 477 | if (!opts) |
| 478 | return -ENOMEM; |
| 479 | |
| 480 | orig = opts; |
| 481 | |
| 482 | while ((ptr = strsep(&opts, ",")) != NULL) { |
| 483 | if (!*ptr) |
| 484 | continue; |
| 485 | |
| 486 | token = match_token(ptr, tokens, args); |
| 487 | switch (token) { |
| 488 | case Opt_udev_path: |
| 489 | if (ib_dev->ibd_bd) { |
| 490 | printk(KERN_ERR "Unable to set udev_path= while" |
| 491 | " ib_dev->ibd_bd exists\n"); |
| 492 | ret = -EEXIST; |
| 493 | goto out; |
| 494 | } |
| 495 | |
| 496 | ret = snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN, |
| 497 | "%s", match_strdup(&args[0])); |
| 498 | printk(KERN_INFO "IBLOCK: Referencing UDEV path: %s\n", |
| 499 | ib_dev->ibd_udev_path); |
| 500 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; |
| 501 | break; |
| 502 | case Opt_force: |
| 503 | match_int(args, &arg); |
| 504 | ib_dev->ibd_force = arg; |
| 505 | printk(KERN_INFO "IBLOCK: Set force=%d\n", |
| 506 | ib_dev->ibd_force); |
| 507 | break; |
| 508 | default: |
| 509 | break; |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | out: |
| 514 | kfree(orig); |
| 515 | return (!ret) ? count : ret; |
| 516 | } |
| 517 | |
| 518 | static ssize_t iblock_check_configfs_dev_params( |
| 519 | struct se_hba *hba, |
| 520 | struct se_subsystem_dev *se_dev) |
| 521 | { |
| 522 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; |
| 523 | |
| 524 | if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
| 525 | printk(KERN_ERR "Missing udev_path= parameters for IBLOCK\n"); |
| 526 | return -1; |
| 527 | } |
| 528 | |
| 529 | return 0; |
| 530 | } |
| 531 | |
| 532 | static ssize_t iblock_show_configfs_dev_params( |
| 533 | struct se_hba *hba, |
| 534 | struct se_subsystem_dev *se_dev, |
| 535 | char *b) |
| 536 | { |
| 537 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; |
| 538 | struct block_device *bd = ibd->ibd_bd; |
| 539 | char buf[BDEVNAME_SIZE]; |
| 540 | ssize_t bl = 0; |
| 541 | |
| 542 | if (bd) |
| 543 | bl += sprintf(b + bl, "iBlock device: %s", |
| 544 | bdevname(bd, buf)); |
| 545 | if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) { |
| 546 | bl += sprintf(b + bl, " UDEV PATH: %s\n", |
| 547 | ibd->ibd_udev_path); |
| 548 | } else |
| 549 | bl += sprintf(b + bl, "\n"); |
| 550 | |
| 551 | bl += sprintf(b + bl, " "); |
| 552 | if (bd) { |
| 553 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", |
| 554 | ibd->ibd_major, ibd->ibd_minor, (!bd->bd_contains) ? |
| 555 | "" : (bd->bd_holder == (struct iblock_dev *)ibd) ? |
| 556 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
| 557 | } else { |
| 558 | bl += sprintf(b + bl, "Major: %d Minor: %d\n", |
| 559 | ibd->ibd_major, ibd->ibd_minor); |
| 560 | } |
| 561 | |
| 562 | return bl; |
| 563 | } |
| 564 | |
| 565 | static void iblock_bio_destructor(struct bio *bio) |
| 566 | { |
| 567 | struct se_task *task = bio->bi_private; |
| 568 | struct iblock_dev *ib_dev = task->se_dev->dev_ptr; |
| 569 | |
| 570 | bio_free(bio, ib_dev->ibd_bio_set); |
| 571 | } |
| 572 | |
| 573 | static struct bio *iblock_get_bio( |
| 574 | struct se_task *task, |
| 575 | struct iblock_req *ib_req, |
| 576 | struct iblock_dev *ib_dev, |
| 577 | int *ret, |
| 578 | sector_t lba, |
| 579 | u32 sg_num) |
| 580 | { |
| 581 | struct bio *bio; |
| 582 | |
| 583 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); |
| 584 | if (!(bio)) { |
| 585 | printk(KERN_ERR "Unable to allocate memory for bio\n"); |
| 586 | *ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; |
| 587 | return NULL; |
| 588 | } |
| 589 | |
| 590 | DEBUG_IBLOCK("Allocated bio: %p task_sg_num: %u using ibd_bio_set:" |
| 591 | " %p\n", bio, task->task_sg_num, ib_dev->ibd_bio_set); |
| 592 | DEBUG_IBLOCK("Allocated bio: %p task_size: %u\n", bio, task->task_size); |
| 593 | |
| 594 | bio->bi_bdev = ib_dev->ibd_bd; |
| 595 | bio->bi_private = (void *) task; |
| 596 | bio->bi_destructor = iblock_bio_destructor; |
| 597 | bio->bi_end_io = &iblock_bio_done; |
| 598 | bio->bi_sector = lba; |
| 599 | atomic_inc(&ib_req->ib_bio_cnt); |
| 600 | |
| 601 | DEBUG_IBLOCK("Set bio->bi_sector: %llu\n", bio->bi_sector); |
| 602 | DEBUG_IBLOCK("Set ib_req->ib_bio_cnt: %d\n", |
| 603 | atomic_read(&ib_req->ib_bio_cnt)); |
| 604 | return bio; |
| 605 | } |
| 606 | |
| 607 | static int iblock_map_task_SG(struct se_task *task) |
| 608 | { |
| 609 | struct se_cmd *cmd = task->task_se_cmd; |
| 610 | struct se_device *dev = SE_DEV(cmd); |
| 611 | struct iblock_dev *ib_dev = task->se_dev->dev_ptr; |
| 612 | struct iblock_req *ib_req = IBLOCK_REQ(task); |
| 613 | struct bio *bio = NULL, *hbio = NULL, *tbio = NULL; |
| 614 | struct scatterlist *sg; |
| 615 | int ret = 0; |
| 616 | u32 i, sg_num = task->task_sg_num; |
| 617 | sector_t block_lba; |
| 618 | /* |
| 619 | * Do starting conversion up from non 512-byte blocksize with |
| 620 | * struct se_task SCSI blocksize into Linux/Block 512 units for BIO. |
| 621 | */ |
| 622 | if (DEV_ATTRIB(dev)->block_size == 4096) |
| 623 | block_lba = (task->task_lba << 3); |
| 624 | else if (DEV_ATTRIB(dev)->block_size == 2048) |
| 625 | block_lba = (task->task_lba << 2); |
| 626 | else if (DEV_ATTRIB(dev)->block_size == 1024) |
| 627 | block_lba = (task->task_lba << 1); |
| 628 | else if (DEV_ATTRIB(dev)->block_size == 512) |
| 629 | block_lba = task->task_lba; |
| 630 | else { |
| 631 | printk(KERN_ERR "Unsupported SCSI -> BLOCK LBA conversion:" |
| 632 | " %u\n", DEV_ATTRIB(dev)->block_size); |
| 633 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 634 | } |
| 635 | |
| 636 | bio = iblock_get_bio(task, ib_req, ib_dev, &ret, block_lba, sg_num); |
| 637 | if (!(bio)) |
| 638 | return ret; |
| 639 | |
| 640 | ib_req->ib_bio = bio; |
| 641 | hbio = tbio = bio; |
| 642 | /* |
| 643 | * Use fs/bio.c:bio_add_pages() to setup the bio_vec maplist |
| 644 | * from TCM struct se_mem -> task->task_sg -> struct scatterlist memory. |
| 645 | */ |
| 646 | for_each_sg(task->task_sg, sg, task->task_sg_num, i) { |
| 647 | DEBUG_IBLOCK("task: %p bio: %p Calling bio_add_page(): page:" |
| 648 | " %p len: %u offset: %u\n", task, bio, sg_page(sg), |
| 649 | sg->length, sg->offset); |
| 650 | again: |
| 651 | ret = bio_add_page(bio, sg_page(sg), sg->length, sg->offset); |
| 652 | if (ret != sg->length) { |
| 653 | |
| 654 | DEBUG_IBLOCK("*** Set bio->bi_sector: %llu\n", |
| 655 | bio->bi_sector); |
| 656 | DEBUG_IBLOCK("** task->task_size: %u\n", |
| 657 | task->task_size); |
| 658 | DEBUG_IBLOCK("*** bio->bi_max_vecs: %u\n", |
| 659 | bio->bi_max_vecs); |
| 660 | DEBUG_IBLOCK("*** bio->bi_vcnt: %u\n", |
| 661 | bio->bi_vcnt); |
| 662 | |
| 663 | bio = iblock_get_bio(task, ib_req, ib_dev, &ret, |
| 664 | block_lba, sg_num); |
| 665 | if (!(bio)) |
| 666 | goto fail; |
| 667 | |
| 668 | tbio = tbio->bi_next = bio; |
| 669 | DEBUG_IBLOCK("-----------------> Added +1 bio: %p to" |
| 670 | " list, Going to again\n", bio); |
| 671 | goto again; |
| 672 | } |
| 673 | /* Always in 512 byte units for Linux/Block */ |
| 674 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; |
| 675 | sg_num--; |
| 676 | DEBUG_IBLOCK("task: %p bio-add_page() passed!, decremented" |
| 677 | " sg_num to %u\n", task, sg_num); |
| 678 | DEBUG_IBLOCK("task: %p bio_add_page() passed!, increased lba" |
| 679 | " to %llu\n", task, block_lba); |
| 680 | DEBUG_IBLOCK("task: %p bio_add_page() passed!, bio->bi_vcnt:" |
| 681 | " %u\n", task, bio->bi_vcnt); |
| 682 | } |
| 683 | |
| 684 | return 0; |
| 685 | fail: |
| 686 | while (hbio) { |
| 687 | bio = hbio; |
| 688 | hbio = hbio->bi_next; |
| 689 | bio->bi_next = NULL; |
| 690 | bio_put(bio); |
| 691 | } |
| 692 | return ret; |
| 693 | } |
| 694 | |
| 695 | static unsigned char *iblock_get_cdb(struct se_task *task) |
| 696 | { |
| 697 | return IBLOCK_REQ(task)->ib_scsi_cdb; |
| 698 | } |
| 699 | |
| 700 | static u32 iblock_get_device_rev(struct se_device *dev) |
| 701 | { |
| 702 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ |
| 703 | } |
| 704 | |
| 705 | static u32 iblock_get_device_type(struct se_device *dev) |
| 706 | { |
| 707 | return TYPE_DISK; |
| 708 | } |
| 709 | |
| 710 | static sector_t iblock_get_blocks(struct se_device *dev) |
| 711 | { |
| 712 | struct iblock_dev *ibd = dev->dev_ptr; |
| 713 | struct block_device *bd = ibd->ibd_bd; |
| 714 | struct request_queue *q = bdev_get_queue(bd); |
| 715 | |
| 716 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); |
| 717 | } |
| 718 | |
| 719 | static void iblock_bio_done(struct bio *bio, int err) |
| 720 | { |
| 721 | struct se_task *task = bio->bi_private; |
| 722 | struct iblock_req *ibr = IBLOCK_REQ(task); |
| 723 | /* |
| 724 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 |
| 725 | */ |
| 726 | if (!(test_bit(BIO_UPTODATE, &bio->bi_flags)) && !(err)) |
| 727 | err = -EIO; |
| 728 | |
| 729 | if (err != 0) { |
| 730 | printk(KERN_ERR "test_bit(BIO_UPTODATE) failed for bio: %p," |
| 731 | " err: %d\n", bio, err); |
| 732 | /* |
| 733 | * Bump the ib_bio_err_cnt and release bio. |
| 734 | */ |
| 735 | atomic_inc(&ibr->ib_bio_err_cnt); |
| 736 | smp_mb__after_atomic_inc(); |
| 737 | bio_put(bio); |
| 738 | /* |
| 739 | * Wait to complete the task until the last bio as completed. |
| 740 | */ |
| 741 | if (!(atomic_dec_and_test(&ibr->ib_bio_cnt))) |
| 742 | return; |
| 743 | |
| 744 | ibr->ib_bio = NULL; |
| 745 | transport_complete_task(task, 0); |
| 746 | return; |
| 747 | } |
| 748 | DEBUG_IBLOCK("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n", |
| 749 | task, bio, task->task_lba, bio->bi_sector, err); |
| 750 | /* |
| 751 | * bio_put() will call iblock_bio_destructor() to release the bio back |
| 752 | * to ibr->ib_bio_set. |
| 753 | */ |
| 754 | bio_put(bio); |
| 755 | /* |
| 756 | * Wait to complete the task until the last bio as completed. |
| 757 | */ |
| 758 | if (!(atomic_dec_and_test(&ibr->ib_bio_cnt))) |
| 759 | return; |
| 760 | /* |
| 761 | * Return GOOD status for task if zero ib_bio_err_cnt exists. |
| 762 | */ |
| 763 | ibr->ib_bio = NULL; |
| 764 | transport_complete_task(task, (!atomic_read(&ibr->ib_bio_err_cnt))); |
| 765 | } |
| 766 | |
| 767 | static struct se_subsystem_api iblock_template = { |
| 768 | .name = "iblock", |
| 769 | .owner = THIS_MODULE, |
| 770 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, |
| 771 | .map_task_SG = iblock_map_task_SG, |
| 772 | .attach_hba = iblock_attach_hba, |
| 773 | .detach_hba = iblock_detach_hba, |
| 774 | .allocate_virtdevice = iblock_allocate_virtdevice, |
| 775 | .create_virtdevice = iblock_create_virtdevice, |
| 776 | .free_device = iblock_free_device, |
| 777 | .dpo_emulated = iblock_emulated_dpo, |
| 778 | .fua_write_emulated = iblock_emulated_fua_write, |
| 779 | .fua_read_emulated = iblock_emulated_fua_read, |
| 780 | .write_cache_emulated = iblock_emulated_write_cache, |
| 781 | .alloc_task = iblock_alloc_task, |
| 782 | .do_task = iblock_do_task, |
| 783 | .do_discard = iblock_do_discard, |
| 784 | .do_sync_cache = iblock_emulate_sync_cache, |
| 785 | .free_task = iblock_free_task, |
| 786 | .check_configfs_dev_params = iblock_check_configfs_dev_params, |
| 787 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
| 788 | .show_configfs_dev_params = iblock_show_configfs_dev_params, |
| 789 | .get_cdb = iblock_get_cdb, |
| 790 | .get_device_rev = iblock_get_device_rev, |
| 791 | .get_device_type = iblock_get_device_type, |
| 792 | .get_blocks = iblock_get_blocks, |
| 793 | }; |
| 794 | |
| 795 | static int __init iblock_module_init(void) |
| 796 | { |
| 797 | return transport_subsystem_register(&iblock_template); |
| 798 | } |
| 799 | |
| 800 | static void iblock_module_exit(void) |
| 801 | { |
| 802 | transport_subsystem_release(&iblock_template); |
| 803 | } |
| 804 | |
| 805 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); |
| 806 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); |
| 807 | MODULE_LICENSE("GPL"); |
| 808 | |
| 809 | module_init(iblock_module_init); |
| 810 | module_exit(iblock_module_exit); |