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> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 38 | #include <linux/bio.h> |
| 39 | #include <linux/genhd.h> |
| 40 | #include <linux/file.h> |
| 41 | #include <scsi/scsi.h> |
| 42 | #include <scsi/scsi_host.h> |
| 43 | |
| 44 | #include <target/target_core_base.h> |
| 45 | #include <target/target_core_device.h> |
| 46 | #include <target/target_core_transport.h> |
| 47 | |
| 48 | #include "target_core_iblock.h" |
| 49 | |
| 50 | #if 0 |
| 51 | #define DEBUG_IBLOCK(x...) printk(x) |
| 52 | #else |
| 53 | #define DEBUG_IBLOCK(x...) |
| 54 | #endif |
| 55 | |
| 56 | static struct se_subsystem_api iblock_template; |
| 57 | |
| 58 | static void iblock_bio_done(struct bio *, int); |
| 59 | |
| 60 | /* iblock_attach_hba(): (Part of se_subsystem_api_t template) |
| 61 | * |
| 62 | * |
| 63 | */ |
| 64 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) |
| 65 | { |
| 66 | struct iblock_hba *ib_host; |
| 67 | |
| 68 | ib_host = kzalloc(sizeof(struct iblock_hba), GFP_KERNEL); |
| 69 | if (!(ib_host)) { |
| 70 | printk(KERN_ERR "Unable to allocate memory for" |
| 71 | " struct iblock_hba\n"); |
| 72 | return -ENOMEM; |
| 73 | } |
| 74 | |
| 75 | ib_host->iblock_host_id = host_id; |
| 76 | |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 77 | hba->hba_ptr = ib_host; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 78 | |
| 79 | printk(KERN_INFO "CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
| 80 | " Generic Target Core Stack %s\n", hba->hba_id, |
| 81 | IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); |
| 82 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 83 | printk(KERN_INFO "CORE_HBA[%d] - Attached iBlock HBA: %u to Generic\n", |
| 84 | hba->hba_id, ib_host->iblock_host_id); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 85 | |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | static void iblock_detach_hba(struct se_hba *hba) |
| 90 | { |
| 91 | struct iblock_hba *ib_host = hba->hba_ptr; |
| 92 | |
| 93 | printk(KERN_INFO "CORE_HBA[%d] - Detached iBlock HBA: %u from Generic" |
| 94 | " Target Core\n", hba->hba_id, ib_host->iblock_host_id); |
| 95 | |
| 96 | kfree(ib_host); |
| 97 | hba->hba_ptr = NULL; |
| 98 | } |
| 99 | |
| 100 | static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name) |
| 101 | { |
| 102 | struct iblock_dev *ib_dev = NULL; |
| 103 | struct iblock_hba *ib_host = hba->hba_ptr; |
| 104 | |
| 105 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); |
| 106 | if (!(ib_dev)) { |
| 107 | printk(KERN_ERR "Unable to allocate struct iblock_dev\n"); |
| 108 | return NULL; |
| 109 | } |
| 110 | ib_dev->ibd_host = ib_host; |
| 111 | |
| 112 | printk(KERN_INFO "IBLOCK: Allocated ib_dev for %s\n", name); |
| 113 | |
| 114 | return ib_dev; |
| 115 | } |
| 116 | |
| 117 | static struct se_device *iblock_create_virtdevice( |
| 118 | struct se_hba *hba, |
| 119 | struct se_subsystem_dev *se_dev, |
| 120 | void *p) |
| 121 | { |
| 122 | struct iblock_dev *ib_dev = p; |
| 123 | struct se_device *dev; |
| 124 | struct se_dev_limits dev_limits; |
| 125 | struct block_device *bd = NULL; |
| 126 | struct request_queue *q; |
| 127 | struct queue_limits *limits; |
| 128 | u32 dev_flags = 0; |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 129 | int ret = -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 130 | |
| 131 | if (!(ib_dev)) { |
| 132 | printk(KERN_ERR "Unable to locate struct iblock_dev parameter\n"); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 133 | return ERR_PTR(ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 134 | } |
| 135 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); |
| 136 | /* |
| 137 | * These settings need to be made tunable.. |
| 138 | */ |
| 139 | ib_dev->ibd_bio_set = bioset_create(32, 64); |
| 140 | if (!(ib_dev->ibd_bio_set)) { |
| 141 | printk(KERN_ERR "IBLOCK: Unable to create bioset()\n"); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 142 | return ERR_PTR(-ENOMEM); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 143 | } |
| 144 | printk(KERN_INFO "IBLOCK: Created bio_set()\n"); |
| 145 | /* |
| 146 | * iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path |
| 147 | * must already have been set in order for echo 1 > $HBA/$DEV/enable to run. |
| 148 | */ |
| 149 | printk(KERN_INFO "IBLOCK: Claiming struct block_device: %s\n", |
| 150 | ib_dev->ibd_udev_path); |
| 151 | |
| 152 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, |
| 153 | FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 154 | if (IS_ERR(bd)) { |
| 155 | ret = PTR_ERR(bd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 156 | goto failed; |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 157 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 158 | /* |
| 159 | * Setup the local scope queue_limits from struct request_queue->limits |
| 160 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. |
| 161 | */ |
| 162 | q = bdev_get_queue(bd); |
| 163 | limits = &dev_limits.limits; |
| 164 | limits->logical_block_size = bdev_logical_block_size(bd); |
| 165 | limits->max_hw_sectors = queue_max_hw_sectors(q); |
| 166 | limits->max_sectors = queue_max_sectors(q); |
Nicholas Bellinger | 8f3d14e | 2011-06-22 01:32:20 -0700 | [diff] [blame] | 167 | dev_limits.hw_queue_depth = q->nr_requests; |
| 168 | dev_limits.queue_depth = q->nr_requests; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 169 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 170 | ib_dev->ibd_bd = bd; |
| 171 | |
| 172 | dev = transport_add_device_to_core_hba(hba, |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 173 | &iblock_template, se_dev, dev_flags, ib_dev, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 174 | &dev_limits, "IBLOCK", IBLOCK_VERSION); |
| 175 | if (!(dev)) |
| 176 | goto failed; |
| 177 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 178 | /* |
| 179 | * Check if the underlying struct block_device request_queue supports |
| 180 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM |
| 181 | * in ATA and we need to set TPE=1 |
| 182 | */ |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 183 | if (blk_queue_discard(q)) { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 184 | dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 185 | q->limits.max_discard_sectors; |
| 186 | /* |
| 187 | * Currently hardcoded to 1 in Linux/SCSI code.. |
| 188 | */ |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 189 | dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count = 1; |
| 190 | dev->se_sub_dev->se_dev_attrib.unmap_granularity = |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 191 | q->limits.discard_granularity; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 192 | dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 193 | q->limits.discard_alignment; |
| 194 | |
| 195 | printk(KERN_INFO "IBLOCK: BLOCK Discard support available," |
| 196 | " disabled by default\n"); |
| 197 | } |
| 198 | |
| 199 | return dev; |
| 200 | |
| 201 | failed: |
| 202 | if (ib_dev->ibd_bio_set) { |
| 203 | bioset_free(ib_dev->ibd_bio_set); |
| 204 | ib_dev->ibd_bio_set = NULL; |
| 205 | } |
| 206 | ib_dev->ibd_bd = NULL; |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 207 | return ERR_PTR(ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 208 | } |
| 209 | |
| 210 | static void iblock_free_device(void *p) |
| 211 | { |
| 212 | struct iblock_dev *ib_dev = p; |
| 213 | |
Nicholas Bellinger | bc66552 | 2011-02-09 15:34:38 -0800 | [diff] [blame] | 214 | if (ib_dev->ibd_bd != NULL) |
| 215 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); |
| 216 | if (ib_dev->ibd_bio_set != NULL) |
| 217 | bioset_free(ib_dev->ibd_bio_set); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 218 | kfree(ib_dev); |
| 219 | } |
| 220 | |
| 221 | static inline struct iblock_req *IBLOCK_REQ(struct se_task *task) |
| 222 | { |
| 223 | return container_of(task, struct iblock_req, ib_task); |
| 224 | } |
| 225 | |
| 226 | static struct se_task * |
| 227 | iblock_alloc_task(struct se_cmd *cmd) |
| 228 | { |
| 229 | struct iblock_req *ib_req; |
| 230 | |
| 231 | ib_req = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
| 232 | if (!(ib_req)) { |
| 233 | printk(KERN_ERR "Unable to allocate memory for struct iblock_req\n"); |
| 234 | return NULL; |
| 235 | } |
| 236 | |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 237 | ib_req->ib_dev = cmd->se_dev->dev_ptr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 238 | atomic_set(&ib_req->ib_bio_cnt, 0); |
| 239 | return &ib_req->ib_task; |
| 240 | } |
| 241 | |
| 242 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
| 243 | struct se_device *dev, |
| 244 | struct block_device *bd, |
| 245 | struct request_queue *q) |
| 246 | { |
| 247 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), |
| 248 | bdev_logical_block_size(bd)) - 1); |
| 249 | u32 block_size = bdev_logical_block_size(bd); |
| 250 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 251 | if (block_size == dev->se_sub_dev->se_dev_attrib.block_size) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 252 | return blocks_long; |
| 253 | |
| 254 | switch (block_size) { |
| 255 | case 4096: |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 256 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 257 | case 2048: |
| 258 | blocks_long <<= 1; |
| 259 | break; |
| 260 | case 1024: |
| 261 | blocks_long <<= 2; |
| 262 | break; |
| 263 | case 512: |
| 264 | blocks_long <<= 3; |
| 265 | default: |
| 266 | break; |
| 267 | } |
| 268 | break; |
| 269 | case 2048: |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 270 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 271 | case 4096: |
| 272 | blocks_long >>= 1; |
| 273 | break; |
| 274 | case 1024: |
| 275 | blocks_long <<= 1; |
| 276 | break; |
| 277 | case 512: |
| 278 | blocks_long <<= 2; |
| 279 | break; |
| 280 | default: |
| 281 | break; |
| 282 | } |
| 283 | break; |
| 284 | case 1024: |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 285 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 286 | case 4096: |
| 287 | blocks_long >>= 2; |
| 288 | break; |
| 289 | case 2048: |
| 290 | blocks_long >>= 1; |
| 291 | break; |
| 292 | case 512: |
| 293 | blocks_long <<= 1; |
| 294 | break; |
| 295 | default: |
| 296 | break; |
| 297 | } |
| 298 | break; |
| 299 | case 512: |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 300 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 301 | case 4096: |
| 302 | blocks_long >>= 3; |
| 303 | break; |
| 304 | case 2048: |
| 305 | blocks_long >>= 2; |
| 306 | break; |
| 307 | case 1024: |
| 308 | blocks_long >>= 1; |
| 309 | break; |
| 310 | default: |
| 311 | break; |
| 312 | } |
| 313 | break; |
| 314 | default: |
| 315 | break; |
| 316 | } |
| 317 | |
| 318 | return blocks_long; |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * Emulate SYCHRONIZE_CACHE_* |
| 323 | */ |
| 324 | static void iblock_emulate_sync_cache(struct se_task *task) |
| 325 | { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 326 | struct se_cmd *cmd = task->task_se_cmd; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 327 | struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 328 | int immed = (cmd->t_task_cdb[1] & 0x2); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 329 | sector_t error_sector; |
| 330 | int ret; |
| 331 | |
| 332 | /* |
| 333 | * If the Immediate bit is set, queue up the GOOD response |
| 334 | * for this SYNCHRONIZE_CACHE op |
| 335 | */ |
| 336 | if (immed) |
| 337 | transport_complete_sync_cache(cmd, 1); |
| 338 | |
| 339 | /* |
| 340 | * blkdev_issue_flush() does not support a specifying a range, so |
| 341 | * we have to flush the entire cache. |
| 342 | */ |
| 343 | ret = blkdev_issue_flush(ib_dev->ibd_bd, GFP_KERNEL, &error_sector); |
| 344 | if (ret != 0) { |
| 345 | printk(KERN_ERR "IBLOCK: block_issue_flush() failed: %d " |
| 346 | " error_sector: %llu\n", ret, |
| 347 | (unsigned long long)error_sector); |
| 348 | } |
| 349 | |
| 350 | if (!immed) |
| 351 | transport_complete_sync_cache(cmd, ret == 0); |
| 352 | } |
| 353 | |
| 354 | /* |
| 355 | * Tell TCM Core that we are capable of WriteCache emulation for |
| 356 | * an underlying struct se_device. |
| 357 | */ |
| 358 | static int iblock_emulated_write_cache(struct se_device *dev) |
| 359 | { |
| 360 | return 1; |
| 361 | } |
| 362 | |
| 363 | static int iblock_emulated_dpo(struct se_device *dev) |
| 364 | { |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | /* |
| 369 | * Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs |
| 370 | * for TYPE_DISK. |
| 371 | */ |
| 372 | static int iblock_emulated_fua_write(struct se_device *dev) |
| 373 | { |
| 374 | return 1; |
| 375 | } |
| 376 | |
| 377 | static int iblock_emulated_fua_read(struct se_device *dev) |
| 378 | { |
| 379 | return 0; |
| 380 | } |
| 381 | |
| 382 | static int iblock_do_task(struct se_task *task) |
| 383 | { |
| 384 | struct se_device *dev = task->task_se_cmd->se_dev; |
| 385 | struct iblock_req *req = IBLOCK_REQ(task); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 386 | struct bio *bio = req->ib_bio, *nbio = NULL; |
Jens Axboe | 7eaceac | 2011-03-10 08:52:07 +0100 | [diff] [blame] | 387 | struct blk_plug plug; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 388 | int rw; |
| 389 | |
| 390 | if (task->task_data_direction == DMA_TO_DEVICE) { |
| 391 | /* |
| 392 | * Force data to disk if we pretend to not have a volatile |
| 393 | * write cache, or the initiator set the Force Unit Access bit. |
| 394 | */ |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 395 | if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache == 0 || |
| 396 | (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 397 | task->task_se_cmd->t_tasks_fua)) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 398 | rw = WRITE_FUA; |
| 399 | else |
| 400 | rw = WRITE; |
| 401 | } else { |
| 402 | rw = READ; |
| 403 | } |
| 404 | |
Jens Axboe | 7eaceac | 2011-03-10 08:52:07 +0100 | [diff] [blame] | 405 | blk_start_plug(&plug); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 406 | while (bio) { |
| 407 | nbio = bio->bi_next; |
| 408 | bio->bi_next = NULL; |
| 409 | DEBUG_IBLOCK("Calling submit_bio() task: %p bio: %p" |
| 410 | " bio->bi_sector: %llu\n", task, bio, bio->bi_sector); |
| 411 | |
| 412 | submit_bio(rw, bio); |
| 413 | bio = nbio; |
| 414 | } |
Jens Axboe | 7eaceac | 2011-03-10 08:52:07 +0100 | [diff] [blame] | 415 | blk_finish_plug(&plug); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 416 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 417 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; |
| 418 | } |
| 419 | |
| 420 | static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range) |
| 421 | { |
| 422 | struct iblock_dev *ibd = dev->dev_ptr; |
| 423 | struct block_device *bd = ibd->ibd_bd; |
| 424 | int barrier = 0; |
| 425 | |
| 426 | return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier); |
| 427 | } |
| 428 | |
| 429 | static void iblock_free_task(struct se_task *task) |
| 430 | { |
| 431 | struct iblock_req *req = IBLOCK_REQ(task); |
| 432 | struct bio *bio, *hbio = req->ib_bio; |
| 433 | /* |
| 434 | * We only release the bio(s) here if iblock_bio_done() has not called |
| 435 | * bio_put() -> iblock_bio_destructor(). |
| 436 | */ |
| 437 | while (hbio != NULL) { |
| 438 | bio = hbio; |
| 439 | hbio = hbio->bi_next; |
| 440 | bio->bi_next = NULL; |
| 441 | bio_put(bio); |
| 442 | } |
| 443 | |
| 444 | kfree(req); |
| 445 | } |
| 446 | |
| 447 | enum { |
| 448 | Opt_udev_path, Opt_force, Opt_err |
| 449 | }; |
| 450 | |
| 451 | static match_table_t tokens = { |
| 452 | {Opt_udev_path, "udev_path=%s"}, |
| 453 | {Opt_force, "force=%d"}, |
| 454 | {Opt_err, NULL} |
| 455 | }; |
| 456 | |
| 457 | static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba, |
| 458 | struct se_subsystem_dev *se_dev, |
| 459 | const char *page, ssize_t count) |
| 460 | { |
| 461 | struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr; |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 462 | char *orig, *ptr, *arg_p, *opts; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 463 | substring_t args[MAX_OPT_ARGS]; |
Roland Dreier | 21bca31 | 2011-07-05 15:35:02 -0700 | [diff] [blame^] | 464 | int ret = 0, token; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 465 | |
| 466 | opts = kstrdup(page, GFP_KERNEL); |
| 467 | if (!opts) |
| 468 | return -ENOMEM; |
| 469 | |
| 470 | orig = opts; |
| 471 | |
| 472 | while ((ptr = strsep(&opts, ",")) != NULL) { |
| 473 | if (!*ptr) |
| 474 | continue; |
| 475 | |
| 476 | token = match_token(ptr, tokens, args); |
| 477 | switch (token) { |
| 478 | case Opt_udev_path: |
| 479 | if (ib_dev->ibd_bd) { |
| 480 | printk(KERN_ERR "Unable to set udev_path= while" |
| 481 | " ib_dev->ibd_bd exists\n"); |
| 482 | ret = -EEXIST; |
| 483 | goto out; |
| 484 | } |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 485 | arg_p = match_strdup(&args[0]); |
| 486 | if (!arg_p) { |
| 487 | ret = -ENOMEM; |
| 488 | break; |
| 489 | } |
| 490 | snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN, |
| 491 | "%s", arg_p); |
| 492 | kfree(arg_p); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 493 | printk(KERN_INFO "IBLOCK: Referencing UDEV path: %s\n", |
| 494 | ib_dev->ibd_udev_path); |
| 495 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; |
| 496 | break; |
| 497 | case Opt_force: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 498 | break; |
| 499 | default: |
| 500 | break; |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | out: |
| 505 | kfree(orig); |
| 506 | return (!ret) ? count : ret; |
| 507 | } |
| 508 | |
| 509 | static ssize_t iblock_check_configfs_dev_params( |
| 510 | struct se_hba *hba, |
| 511 | struct se_subsystem_dev *se_dev) |
| 512 | { |
| 513 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; |
| 514 | |
| 515 | if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
| 516 | printk(KERN_ERR "Missing udev_path= parameters for IBLOCK\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 517 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 518 | } |
| 519 | |
| 520 | return 0; |
| 521 | } |
| 522 | |
| 523 | static ssize_t iblock_show_configfs_dev_params( |
| 524 | struct se_hba *hba, |
| 525 | struct se_subsystem_dev *se_dev, |
| 526 | char *b) |
| 527 | { |
| 528 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; |
| 529 | struct block_device *bd = ibd->ibd_bd; |
| 530 | char buf[BDEVNAME_SIZE]; |
| 531 | ssize_t bl = 0; |
| 532 | |
| 533 | if (bd) |
| 534 | bl += sprintf(b + bl, "iBlock device: %s", |
| 535 | bdevname(bd, buf)); |
| 536 | if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) { |
| 537 | bl += sprintf(b + bl, " UDEV PATH: %s\n", |
| 538 | ibd->ibd_udev_path); |
| 539 | } else |
| 540 | bl += sprintf(b + bl, "\n"); |
| 541 | |
| 542 | bl += sprintf(b + bl, " "); |
| 543 | if (bd) { |
| 544 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", |
Roland Dreier | 21bca31 | 2011-07-05 15:35:02 -0700 | [diff] [blame^] | 545 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 546 | "" : (bd->bd_holder == (struct iblock_dev *)ibd) ? |
| 547 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
| 548 | } else { |
Roland Dreier | 21bca31 | 2011-07-05 15:35:02 -0700 | [diff] [blame^] | 549 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 550 | } |
| 551 | |
| 552 | return bl; |
| 553 | } |
| 554 | |
| 555 | static void iblock_bio_destructor(struct bio *bio) |
| 556 | { |
| 557 | struct se_task *task = bio->bi_private; |
| 558 | struct iblock_dev *ib_dev = task->se_dev->dev_ptr; |
| 559 | |
| 560 | bio_free(bio, ib_dev->ibd_bio_set); |
| 561 | } |
| 562 | |
| 563 | static struct bio *iblock_get_bio( |
| 564 | struct se_task *task, |
| 565 | struct iblock_req *ib_req, |
| 566 | struct iblock_dev *ib_dev, |
| 567 | int *ret, |
| 568 | sector_t lba, |
| 569 | u32 sg_num) |
| 570 | { |
| 571 | struct bio *bio; |
| 572 | |
| 573 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); |
| 574 | if (!(bio)) { |
| 575 | printk(KERN_ERR "Unable to allocate memory for bio\n"); |
| 576 | *ret = PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; |
| 577 | return NULL; |
| 578 | } |
| 579 | |
| 580 | DEBUG_IBLOCK("Allocated bio: %p task_sg_num: %u using ibd_bio_set:" |
| 581 | " %p\n", bio, task->task_sg_num, ib_dev->ibd_bio_set); |
| 582 | DEBUG_IBLOCK("Allocated bio: %p task_size: %u\n", bio, task->task_size); |
| 583 | |
| 584 | bio->bi_bdev = ib_dev->ibd_bd; |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 585 | bio->bi_private = task; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 586 | bio->bi_destructor = iblock_bio_destructor; |
| 587 | bio->bi_end_io = &iblock_bio_done; |
| 588 | bio->bi_sector = lba; |
| 589 | atomic_inc(&ib_req->ib_bio_cnt); |
| 590 | |
| 591 | DEBUG_IBLOCK("Set bio->bi_sector: %llu\n", bio->bi_sector); |
| 592 | DEBUG_IBLOCK("Set ib_req->ib_bio_cnt: %d\n", |
| 593 | atomic_read(&ib_req->ib_bio_cnt)); |
| 594 | return bio; |
| 595 | } |
| 596 | |
| 597 | static int iblock_map_task_SG(struct se_task *task) |
| 598 | { |
| 599 | struct se_cmd *cmd = task->task_se_cmd; |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 600 | struct se_device *dev = cmd->se_dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 601 | struct iblock_dev *ib_dev = task->se_dev->dev_ptr; |
| 602 | struct iblock_req *ib_req = IBLOCK_REQ(task); |
| 603 | struct bio *bio = NULL, *hbio = NULL, *tbio = NULL; |
| 604 | struct scatterlist *sg; |
| 605 | int ret = 0; |
| 606 | u32 i, sg_num = task->task_sg_num; |
| 607 | sector_t block_lba; |
| 608 | /* |
| 609 | * Do starting conversion up from non 512-byte blocksize with |
| 610 | * struct se_task SCSI blocksize into Linux/Block 512 units for BIO. |
| 611 | */ |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 612 | if (dev->se_sub_dev->se_dev_attrib.block_size == 4096) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 613 | block_lba = (task->task_lba << 3); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 614 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 615 | block_lba = (task->task_lba << 2); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 616 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 617 | block_lba = (task->task_lba << 1); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 618 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 512) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 619 | block_lba = task->task_lba; |
| 620 | else { |
| 621 | printk(KERN_ERR "Unsupported SCSI -> BLOCK LBA conversion:" |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 622 | " %u\n", dev->se_sub_dev->se_dev_attrib.block_size); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 623 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 624 | } |
| 625 | |
| 626 | bio = iblock_get_bio(task, ib_req, ib_dev, &ret, block_lba, sg_num); |
| 627 | if (!(bio)) |
| 628 | return ret; |
| 629 | |
| 630 | ib_req->ib_bio = bio; |
| 631 | hbio = tbio = bio; |
| 632 | /* |
| 633 | * Use fs/bio.c:bio_add_pages() to setup the bio_vec maplist |
| 634 | * from TCM struct se_mem -> task->task_sg -> struct scatterlist memory. |
| 635 | */ |
| 636 | for_each_sg(task->task_sg, sg, task->task_sg_num, i) { |
| 637 | DEBUG_IBLOCK("task: %p bio: %p Calling bio_add_page(): page:" |
| 638 | " %p len: %u offset: %u\n", task, bio, sg_page(sg), |
| 639 | sg->length, sg->offset); |
| 640 | again: |
| 641 | ret = bio_add_page(bio, sg_page(sg), sg->length, sg->offset); |
| 642 | if (ret != sg->length) { |
| 643 | |
| 644 | DEBUG_IBLOCK("*** Set bio->bi_sector: %llu\n", |
| 645 | bio->bi_sector); |
| 646 | DEBUG_IBLOCK("** task->task_size: %u\n", |
| 647 | task->task_size); |
| 648 | DEBUG_IBLOCK("*** bio->bi_max_vecs: %u\n", |
| 649 | bio->bi_max_vecs); |
| 650 | DEBUG_IBLOCK("*** bio->bi_vcnt: %u\n", |
| 651 | bio->bi_vcnt); |
| 652 | |
| 653 | bio = iblock_get_bio(task, ib_req, ib_dev, &ret, |
| 654 | block_lba, sg_num); |
| 655 | if (!(bio)) |
| 656 | goto fail; |
| 657 | |
| 658 | tbio = tbio->bi_next = bio; |
| 659 | DEBUG_IBLOCK("-----------------> Added +1 bio: %p to" |
| 660 | " list, Going to again\n", bio); |
| 661 | goto again; |
| 662 | } |
| 663 | /* Always in 512 byte units for Linux/Block */ |
| 664 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; |
| 665 | sg_num--; |
| 666 | DEBUG_IBLOCK("task: %p bio-add_page() passed!, decremented" |
| 667 | " sg_num to %u\n", task, sg_num); |
| 668 | DEBUG_IBLOCK("task: %p bio_add_page() passed!, increased lba" |
| 669 | " to %llu\n", task, block_lba); |
| 670 | DEBUG_IBLOCK("task: %p bio_add_page() passed!, bio->bi_vcnt:" |
| 671 | " %u\n", task, bio->bi_vcnt); |
| 672 | } |
| 673 | |
| 674 | return 0; |
| 675 | fail: |
| 676 | while (hbio) { |
| 677 | bio = hbio; |
| 678 | hbio = hbio->bi_next; |
| 679 | bio->bi_next = NULL; |
| 680 | bio_put(bio); |
| 681 | } |
| 682 | return ret; |
| 683 | } |
| 684 | |
| 685 | static unsigned char *iblock_get_cdb(struct se_task *task) |
| 686 | { |
| 687 | return IBLOCK_REQ(task)->ib_scsi_cdb; |
| 688 | } |
| 689 | |
| 690 | static u32 iblock_get_device_rev(struct se_device *dev) |
| 691 | { |
| 692 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ |
| 693 | } |
| 694 | |
| 695 | static u32 iblock_get_device_type(struct se_device *dev) |
| 696 | { |
| 697 | return TYPE_DISK; |
| 698 | } |
| 699 | |
| 700 | static sector_t iblock_get_blocks(struct se_device *dev) |
| 701 | { |
| 702 | struct iblock_dev *ibd = dev->dev_ptr; |
| 703 | struct block_device *bd = ibd->ibd_bd; |
| 704 | struct request_queue *q = bdev_get_queue(bd); |
| 705 | |
| 706 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); |
| 707 | } |
| 708 | |
| 709 | static void iblock_bio_done(struct bio *bio, int err) |
| 710 | { |
| 711 | struct se_task *task = bio->bi_private; |
| 712 | struct iblock_req *ibr = IBLOCK_REQ(task); |
| 713 | /* |
| 714 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 |
| 715 | */ |
| 716 | if (!(test_bit(BIO_UPTODATE, &bio->bi_flags)) && !(err)) |
| 717 | err = -EIO; |
| 718 | |
| 719 | if (err != 0) { |
| 720 | printk(KERN_ERR "test_bit(BIO_UPTODATE) failed for bio: %p," |
| 721 | " err: %d\n", bio, err); |
| 722 | /* |
| 723 | * Bump the ib_bio_err_cnt and release bio. |
| 724 | */ |
| 725 | atomic_inc(&ibr->ib_bio_err_cnt); |
| 726 | smp_mb__after_atomic_inc(); |
| 727 | bio_put(bio); |
| 728 | /* |
| 729 | * Wait to complete the task until the last bio as completed. |
| 730 | */ |
| 731 | if (!(atomic_dec_and_test(&ibr->ib_bio_cnt))) |
| 732 | return; |
| 733 | |
| 734 | ibr->ib_bio = NULL; |
| 735 | transport_complete_task(task, 0); |
| 736 | return; |
| 737 | } |
| 738 | DEBUG_IBLOCK("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n", |
| 739 | task, bio, task->task_lba, bio->bi_sector, err); |
| 740 | /* |
| 741 | * bio_put() will call iblock_bio_destructor() to release the bio back |
| 742 | * to ibr->ib_bio_set. |
| 743 | */ |
| 744 | bio_put(bio); |
| 745 | /* |
| 746 | * Wait to complete the task until the last bio as completed. |
| 747 | */ |
| 748 | if (!(atomic_dec_and_test(&ibr->ib_bio_cnt))) |
| 749 | return; |
| 750 | /* |
| 751 | * Return GOOD status for task if zero ib_bio_err_cnt exists. |
| 752 | */ |
| 753 | ibr->ib_bio = NULL; |
| 754 | transport_complete_task(task, (!atomic_read(&ibr->ib_bio_err_cnt))); |
| 755 | } |
| 756 | |
| 757 | static struct se_subsystem_api iblock_template = { |
| 758 | .name = "iblock", |
| 759 | .owner = THIS_MODULE, |
| 760 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, |
| 761 | .map_task_SG = iblock_map_task_SG, |
| 762 | .attach_hba = iblock_attach_hba, |
| 763 | .detach_hba = iblock_detach_hba, |
| 764 | .allocate_virtdevice = iblock_allocate_virtdevice, |
| 765 | .create_virtdevice = iblock_create_virtdevice, |
| 766 | .free_device = iblock_free_device, |
| 767 | .dpo_emulated = iblock_emulated_dpo, |
| 768 | .fua_write_emulated = iblock_emulated_fua_write, |
| 769 | .fua_read_emulated = iblock_emulated_fua_read, |
| 770 | .write_cache_emulated = iblock_emulated_write_cache, |
| 771 | .alloc_task = iblock_alloc_task, |
| 772 | .do_task = iblock_do_task, |
| 773 | .do_discard = iblock_do_discard, |
| 774 | .do_sync_cache = iblock_emulate_sync_cache, |
| 775 | .free_task = iblock_free_task, |
| 776 | .check_configfs_dev_params = iblock_check_configfs_dev_params, |
| 777 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
| 778 | .show_configfs_dev_params = iblock_show_configfs_dev_params, |
| 779 | .get_cdb = iblock_get_cdb, |
| 780 | .get_device_rev = iblock_get_device_rev, |
| 781 | .get_device_type = iblock_get_device_type, |
| 782 | .get_blocks = iblock_get_blocks, |
| 783 | }; |
| 784 | |
| 785 | static int __init iblock_module_init(void) |
| 786 | { |
| 787 | return transport_subsystem_register(&iblock_template); |
| 788 | } |
| 789 | |
| 790 | static void iblock_module_exit(void) |
| 791 | { |
| 792 | transport_subsystem_release(&iblock_template); |
| 793 | } |
| 794 | |
| 795 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); |
| 796 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); |
| 797 | MODULE_LICENSE("GPL"); |
| 798 | |
| 799 | module_init(iblock_module_init); |
| 800 | module_exit(iblock_module_exit); |