1c66ac9dbSNicholas Bellinger /******************************************************************************* 2c66ac9dbSNicholas Bellinger * Filename: target_core_iblock.c 3c66ac9dbSNicholas Bellinger * 4c66ac9dbSNicholas Bellinger * This file contains the Storage Engine <-> Linux BlockIO transport 5c66ac9dbSNicholas Bellinger * specific functions. 6c66ac9dbSNicholas Bellinger * 7c66ac9dbSNicholas Bellinger * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc. 8c66ac9dbSNicholas Bellinger * Copyright (c) 2005, 2006, 2007 SBE, Inc. 9c66ac9dbSNicholas Bellinger * Copyright (c) 2007-2010 Rising Tide Systems 10c66ac9dbSNicholas Bellinger * Copyright (c) 2008-2010 Linux-iSCSI.org 11c66ac9dbSNicholas Bellinger * 12c66ac9dbSNicholas Bellinger * Nicholas A. Bellinger <nab@kernel.org> 13c66ac9dbSNicholas Bellinger * 14c66ac9dbSNicholas Bellinger * This program is free software; you can redistribute it and/or modify 15c66ac9dbSNicholas Bellinger * it under the terms of the GNU General Public License as published by 16c66ac9dbSNicholas Bellinger * the Free Software Foundation; either version 2 of the License, or 17c66ac9dbSNicholas Bellinger * (at your option) any later version. 18c66ac9dbSNicholas Bellinger * 19c66ac9dbSNicholas Bellinger * This program is distributed in the hope that it will be useful, 20c66ac9dbSNicholas Bellinger * but WITHOUT ANY WARRANTY; without even the implied warranty of 21c66ac9dbSNicholas Bellinger * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22c66ac9dbSNicholas Bellinger * GNU General Public License for more details. 23c66ac9dbSNicholas Bellinger * 24c66ac9dbSNicholas Bellinger * You should have received a copy of the GNU General Public License 25c66ac9dbSNicholas Bellinger * along with this program; if not, write to the Free Software 26c66ac9dbSNicholas Bellinger * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 27c66ac9dbSNicholas Bellinger * 28c66ac9dbSNicholas Bellinger ******************************************************************************/ 29c66ac9dbSNicholas Bellinger 30c66ac9dbSNicholas Bellinger #include <linux/string.h> 31c66ac9dbSNicholas Bellinger #include <linux/parser.h> 32c66ac9dbSNicholas Bellinger #include <linux/timer.h> 33c66ac9dbSNicholas Bellinger #include <linux/fs.h> 34c66ac9dbSNicholas Bellinger #include <linux/blkdev.h> 35c66ac9dbSNicholas Bellinger #include <linux/slab.h> 36c66ac9dbSNicholas Bellinger #include <linux/spinlock.h> 37c66ac9dbSNicholas Bellinger #include <linux/bio.h> 38c66ac9dbSNicholas Bellinger #include <linux/genhd.h> 39c66ac9dbSNicholas Bellinger #include <linux/file.h> 40827509e3SPaul Gortmaker #include <linux/module.h> 41c66ac9dbSNicholas Bellinger #include <scsi/scsi.h> 42c66ac9dbSNicholas Bellinger #include <scsi/scsi_host.h> 43c66ac9dbSNicholas Bellinger 44c66ac9dbSNicholas Bellinger #include <target/target_core_base.h> 45c4795fb2SChristoph Hellwig #include <target/target_core_backend.h> 46c66ac9dbSNicholas Bellinger 47c66ac9dbSNicholas Bellinger #include "target_core_iblock.h" 48c66ac9dbSNicholas Bellinger 49d5b4a21bSChristoph Hellwig #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ 50d5b4a21bSChristoph Hellwig #define IBLOCK_BIO_POOL_SIZE 128 51d5b4a21bSChristoph Hellwig 52c66ac9dbSNicholas Bellinger static struct se_subsystem_api iblock_template; 53c66ac9dbSNicholas Bellinger 54c66ac9dbSNicholas Bellinger static void iblock_bio_done(struct bio *, int); 55c66ac9dbSNicholas Bellinger 56c66ac9dbSNicholas Bellinger /* iblock_attach_hba(): (Part of se_subsystem_api_t template) 57c66ac9dbSNicholas Bellinger * 58c66ac9dbSNicholas Bellinger * 59c66ac9dbSNicholas Bellinger */ 60c66ac9dbSNicholas Bellinger static int iblock_attach_hba(struct se_hba *hba, u32 host_id) 61c66ac9dbSNicholas Bellinger { 626708bb27SAndy Grover pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" 63c66ac9dbSNicholas Bellinger " Generic Target Core Stack %s\n", hba->hba_id, 64c66ac9dbSNicholas Bellinger IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); 65c66ac9dbSNicholas Bellinger return 0; 66c66ac9dbSNicholas Bellinger } 67c66ac9dbSNicholas Bellinger 68c66ac9dbSNicholas Bellinger static void iblock_detach_hba(struct se_hba *hba) 69c66ac9dbSNicholas Bellinger { 70c66ac9dbSNicholas Bellinger } 71c66ac9dbSNicholas Bellinger 72c66ac9dbSNicholas Bellinger static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name) 73c66ac9dbSNicholas Bellinger { 74c66ac9dbSNicholas Bellinger struct iblock_dev *ib_dev = NULL; 75c66ac9dbSNicholas Bellinger 76c66ac9dbSNicholas Bellinger ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); 776708bb27SAndy Grover if (!ib_dev) { 786708bb27SAndy Grover pr_err("Unable to allocate struct iblock_dev\n"); 79c66ac9dbSNicholas Bellinger return NULL; 80c66ac9dbSNicholas Bellinger } 81c66ac9dbSNicholas Bellinger 826708bb27SAndy Grover pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); 83c66ac9dbSNicholas Bellinger 84c66ac9dbSNicholas Bellinger return ib_dev; 85c66ac9dbSNicholas Bellinger } 86c66ac9dbSNicholas Bellinger 87c66ac9dbSNicholas Bellinger static struct se_device *iblock_create_virtdevice( 88c66ac9dbSNicholas Bellinger struct se_hba *hba, 89c66ac9dbSNicholas Bellinger struct se_subsystem_dev *se_dev, 90c66ac9dbSNicholas Bellinger void *p) 91c66ac9dbSNicholas Bellinger { 92c66ac9dbSNicholas Bellinger struct iblock_dev *ib_dev = p; 93c66ac9dbSNicholas Bellinger struct se_device *dev; 94c66ac9dbSNicholas Bellinger struct se_dev_limits dev_limits; 95c66ac9dbSNicholas Bellinger struct block_device *bd = NULL; 96c66ac9dbSNicholas Bellinger struct request_queue *q; 97c66ac9dbSNicholas Bellinger struct queue_limits *limits; 98c66ac9dbSNicholas Bellinger u32 dev_flags = 0; 99613640e4SNicholas Bellinger int ret = -EINVAL; 100c66ac9dbSNicholas Bellinger 1016708bb27SAndy Grover if (!ib_dev) { 1026708bb27SAndy Grover pr_err("Unable to locate struct iblock_dev parameter\n"); 103613640e4SNicholas Bellinger return ERR_PTR(ret); 104c66ac9dbSNicholas Bellinger } 105c66ac9dbSNicholas Bellinger memset(&dev_limits, 0, sizeof(struct se_dev_limits)); 106d5b4a21bSChristoph Hellwig 107d5b4a21bSChristoph Hellwig ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); 1086708bb27SAndy Grover if (!ib_dev->ibd_bio_set) { 1096708bb27SAndy Grover pr_err("IBLOCK: Unable to create bioset()\n"); 110613640e4SNicholas Bellinger return ERR_PTR(-ENOMEM); 111c66ac9dbSNicholas Bellinger } 1126708bb27SAndy Grover pr_debug("IBLOCK: Created bio_set()\n"); 113c66ac9dbSNicholas Bellinger /* 114c66ac9dbSNicholas Bellinger * iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path 115c66ac9dbSNicholas Bellinger * must already have been set in order for echo 1 > $HBA/$DEV/enable to run. 116c66ac9dbSNicholas Bellinger */ 1176708bb27SAndy Grover pr_debug( "IBLOCK: Claiming struct block_device: %s\n", 118c66ac9dbSNicholas Bellinger ib_dev->ibd_udev_path); 119c66ac9dbSNicholas Bellinger 120c66ac9dbSNicholas Bellinger bd = blkdev_get_by_path(ib_dev->ibd_udev_path, 121c66ac9dbSNicholas Bellinger FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev); 122613640e4SNicholas Bellinger if (IS_ERR(bd)) { 123613640e4SNicholas Bellinger ret = PTR_ERR(bd); 124c66ac9dbSNicholas Bellinger goto failed; 125613640e4SNicholas Bellinger } 126c66ac9dbSNicholas Bellinger /* 127c66ac9dbSNicholas Bellinger * Setup the local scope queue_limits from struct request_queue->limits 128c66ac9dbSNicholas Bellinger * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. 129c66ac9dbSNicholas Bellinger */ 130c66ac9dbSNicholas Bellinger q = bdev_get_queue(bd); 131c66ac9dbSNicholas Bellinger limits = &dev_limits.limits; 132c66ac9dbSNicholas Bellinger limits->logical_block_size = bdev_logical_block_size(bd); 133d5b4a21bSChristoph Hellwig limits->max_hw_sectors = UINT_MAX; 134d5b4a21bSChristoph Hellwig limits->max_sectors = UINT_MAX; 1358f3d14e2SNicholas Bellinger dev_limits.hw_queue_depth = q->nr_requests; 1368f3d14e2SNicholas Bellinger dev_limits.queue_depth = q->nr_requests; 137c66ac9dbSNicholas Bellinger 138c66ac9dbSNicholas Bellinger ib_dev->ibd_bd = bd; 139c66ac9dbSNicholas Bellinger 140c66ac9dbSNicholas Bellinger dev = transport_add_device_to_core_hba(hba, 1415951146dSAndy Grover &iblock_template, se_dev, dev_flags, ib_dev, 142c66ac9dbSNicholas Bellinger &dev_limits, "IBLOCK", IBLOCK_VERSION); 1436708bb27SAndy Grover if (!dev) 144c66ac9dbSNicholas Bellinger goto failed; 145c66ac9dbSNicholas Bellinger 146c66ac9dbSNicholas Bellinger /* 147c66ac9dbSNicholas Bellinger * Check if the underlying struct block_device request_queue supports 148c66ac9dbSNicholas Bellinger * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM 149c66ac9dbSNicholas Bellinger * in ATA and we need to set TPE=1 150c66ac9dbSNicholas Bellinger */ 151613640e4SNicholas Bellinger if (blk_queue_discard(q)) { 152e3d6f909SAndy Grover dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = 153c66ac9dbSNicholas Bellinger q->limits.max_discard_sectors; 154c66ac9dbSNicholas Bellinger /* 155c66ac9dbSNicholas Bellinger * Currently hardcoded to 1 in Linux/SCSI code.. 156c66ac9dbSNicholas Bellinger */ 157e3d6f909SAndy Grover dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count = 1; 158e3d6f909SAndy Grover dev->se_sub_dev->se_dev_attrib.unmap_granularity = 1597347b5ffSMarco Sanvido q->limits.discard_granularity >> 9; 160e3d6f909SAndy Grover dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = 161c66ac9dbSNicholas Bellinger q->limits.discard_alignment; 162c66ac9dbSNicholas Bellinger 1636708bb27SAndy Grover pr_debug("IBLOCK: BLOCK Discard support available," 164c66ac9dbSNicholas Bellinger " disabled by default\n"); 165c66ac9dbSNicholas Bellinger } 166c66ac9dbSNicholas Bellinger 167e22a7f07SRoland Dreier if (blk_queue_nonrot(q)) 168e22a7f07SRoland Dreier dev->se_sub_dev->se_dev_attrib.is_nonrot = 1; 169e22a7f07SRoland Dreier 170c66ac9dbSNicholas Bellinger return dev; 171c66ac9dbSNicholas Bellinger 172c66ac9dbSNicholas Bellinger failed: 173c66ac9dbSNicholas Bellinger if (ib_dev->ibd_bio_set) { 174c66ac9dbSNicholas Bellinger bioset_free(ib_dev->ibd_bio_set); 175c66ac9dbSNicholas Bellinger ib_dev->ibd_bio_set = NULL; 176c66ac9dbSNicholas Bellinger } 177c66ac9dbSNicholas Bellinger ib_dev->ibd_bd = NULL; 178613640e4SNicholas Bellinger return ERR_PTR(ret); 179c66ac9dbSNicholas Bellinger } 180c66ac9dbSNicholas Bellinger 181c66ac9dbSNicholas Bellinger static void iblock_free_device(void *p) 182c66ac9dbSNicholas Bellinger { 183c66ac9dbSNicholas Bellinger struct iblock_dev *ib_dev = p; 184c66ac9dbSNicholas Bellinger 185bc665524SNicholas Bellinger if (ib_dev->ibd_bd != NULL) 186c66ac9dbSNicholas Bellinger blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); 187bc665524SNicholas Bellinger if (ib_dev->ibd_bio_set != NULL) 188c66ac9dbSNicholas Bellinger bioset_free(ib_dev->ibd_bio_set); 189c66ac9dbSNicholas Bellinger kfree(ib_dev); 190c66ac9dbSNicholas Bellinger } 191c66ac9dbSNicholas Bellinger 192c66ac9dbSNicholas Bellinger static inline struct iblock_req *IBLOCK_REQ(struct se_task *task) 193c66ac9dbSNicholas Bellinger { 194c66ac9dbSNicholas Bellinger return container_of(task, struct iblock_req, ib_task); 195c66ac9dbSNicholas Bellinger } 196c66ac9dbSNicholas Bellinger 197c66ac9dbSNicholas Bellinger static struct se_task * 1986708bb27SAndy Grover iblock_alloc_task(unsigned char *cdb) 199c66ac9dbSNicholas Bellinger { 200c66ac9dbSNicholas Bellinger struct iblock_req *ib_req; 201c66ac9dbSNicholas Bellinger 202c66ac9dbSNicholas Bellinger ib_req = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); 2036708bb27SAndy Grover if (!ib_req) { 2046708bb27SAndy Grover pr_err("Unable to allocate memory for struct iblock_req\n"); 205c66ac9dbSNicholas Bellinger return NULL; 206c66ac9dbSNicholas Bellinger } 207c66ac9dbSNicholas Bellinger 208d5b4a21bSChristoph Hellwig atomic_set(&ib_req->pending, 1); 209c66ac9dbSNicholas Bellinger return &ib_req->ib_task; 210c66ac9dbSNicholas Bellinger } 211c66ac9dbSNicholas Bellinger 212c66ac9dbSNicholas Bellinger static unsigned long long iblock_emulate_read_cap_with_block_size( 213c66ac9dbSNicholas Bellinger struct se_device *dev, 214c66ac9dbSNicholas Bellinger struct block_device *bd, 215c66ac9dbSNicholas Bellinger struct request_queue *q) 216c66ac9dbSNicholas Bellinger { 217c66ac9dbSNicholas Bellinger unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), 218c66ac9dbSNicholas Bellinger bdev_logical_block_size(bd)) - 1); 219c66ac9dbSNicholas Bellinger u32 block_size = bdev_logical_block_size(bd); 220c66ac9dbSNicholas Bellinger 221e3d6f909SAndy Grover if (block_size == dev->se_sub_dev->se_dev_attrib.block_size) 222c66ac9dbSNicholas Bellinger return blocks_long; 223c66ac9dbSNicholas Bellinger 224c66ac9dbSNicholas Bellinger switch (block_size) { 225c66ac9dbSNicholas Bellinger case 4096: 226e3d6f909SAndy Grover switch (dev->se_sub_dev->se_dev_attrib.block_size) { 227c66ac9dbSNicholas Bellinger case 2048: 228c66ac9dbSNicholas Bellinger blocks_long <<= 1; 229c66ac9dbSNicholas Bellinger break; 230c66ac9dbSNicholas Bellinger case 1024: 231c66ac9dbSNicholas Bellinger blocks_long <<= 2; 232c66ac9dbSNicholas Bellinger break; 233c66ac9dbSNicholas Bellinger case 512: 234c66ac9dbSNicholas Bellinger blocks_long <<= 3; 235c66ac9dbSNicholas Bellinger default: 236c66ac9dbSNicholas Bellinger break; 237c66ac9dbSNicholas Bellinger } 238c66ac9dbSNicholas Bellinger break; 239c66ac9dbSNicholas Bellinger case 2048: 240e3d6f909SAndy Grover switch (dev->se_sub_dev->se_dev_attrib.block_size) { 241c66ac9dbSNicholas Bellinger case 4096: 242c66ac9dbSNicholas Bellinger blocks_long >>= 1; 243c66ac9dbSNicholas Bellinger break; 244c66ac9dbSNicholas Bellinger case 1024: 245c66ac9dbSNicholas Bellinger blocks_long <<= 1; 246c66ac9dbSNicholas Bellinger break; 247c66ac9dbSNicholas Bellinger case 512: 248c66ac9dbSNicholas Bellinger blocks_long <<= 2; 249c66ac9dbSNicholas Bellinger break; 250c66ac9dbSNicholas Bellinger default: 251c66ac9dbSNicholas Bellinger break; 252c66ac9dbSNicholas Bellinger } 253c66ac9dbSNicholas Bellinger break; 254c66ac9dbSNicholas Bellinger case 1024: 255e3d6f909SAndy Grover switch (dev->se_sub_dev->se_dev_attrib.block_size) { 256c66ac9dbSNicholas Bellinger case 4096: 257c66ac9dbSNicholas Bellinger blocks_long >>= 2; 258c66ac9dbSNicholas Bellinger break; 259c66ac9dbSNicholas Bellinger case 2048: 260c66ac9dbSNicholas Bellinger blocks_long >>= 1; 261c66ac9dbSNicholas Bellinger break; 262c66ac9dbSNicholas Bellinger case 512: 263c66ac9dbSNicholas Bellinger blocks_long <<= 1; 264c66ac9dbSNicholas Bellinger break; 265c66ac9dbSNicholas Bellinger default: 266c66ac9dbSNicholas Bellinger break; 267c66ac9dbSNicholas Bellinger } 268c66ac9dbSNicholas Bellinger break; 269c66ac9dbSNicholas Bellinger case 512: 270e3d6f909SAndy Grover switch (dev->se_sub_dev->se_dev_attrib.block_size) { 271c66ac9dbSNicholas Bellinger case 4096: 272c66ac9dbSNicholas Bellinger blocks_long >>= 3; 273c66ac9dbSNicholas Bellinger break; 274c66ac9dbSNicholas Bellinger case 2048: 275c66ac9dbSNicholas Bellinger blocks_long >>= 2; 276c66ac9dbSNicholas Bellinger break; 277c66ac9dbSNicholas Bellinger case 1024: 278c66ac9dbSNicholas Bellinger blocks_long >>= 1; 279c66ac9dbSNicholas Bellinger break; 280c66ac9dbSNicholas Bellinger default: 281c66ac9dbSNicholas Bellinger break; 282c66ac9dbSNicholas Bellinger } 283c66ac9dbSNicholas Bellinger break; 284c66ac9dbSNicholas Bellinger default: 285c66ac9dbSNicholas Bellinger break; 286c66ac9dbSNicholas Bellinger } 287c66ac9dbSNicholas Bellinger 288c66ac9dbSNicholas Bellinger return blocks_long; 289c66ac9dbSNicholas Bellinger } 290c66ac9dbSNicholas Bellinger 291df5fa691SChristoph Hellwig static void iblock_end_io_flush(struct bio *bio, int err) 292df5fa691SChristoph Hellwig { 293df5fa691SChristoph Hellwig struct se_cmd *cmd = bio->bi_private; 294df5fa691SChristoph Hellwig 295df5fa691SChristoph Hellwig if (err) 296df5fa691SChristoph Hellwig pr_err("IBLOCK: cache flush failed: %d\n", err); 297df5fa691SChristoph Hellwig 298df5fa691SChristoph Hellwig if (cmd) 299df5fa691SChristoph Hellwig transport_complete_sync_cache(cmd, err == 0); 300df5fa691SChristoph Hellwig bio_put(bio); 301df5fa691SChristoph Hellwig } 302df5fa691SChristoph Hellwig 303c66ac9dbSNicholas Bellinger /* 304df5fa691SChristoph Hellwig * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must 305df5fa691SChristoph Hellwig * always flush the whole cache. 306c66ac9dbSNicholas Bellinger */ 307c66ac9dbSNicholas Bellinger static void iblock_emulate_sync_cache(struct se_task *task) 308c66ac9dbSNicholas Bellinger { 309e3d6f909SAndy Grover struct se_cmd *cmd = task->task_se_cmd; 310c66ac9dbSNicholas Bellinger struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; 311a1d8b49aSAndy Grover int immed = (cmd->t_task_cdb[1] & 0x2); 312df5fa691SChristoph Hellwig struct bio *bio; 313c66ac9dbSNicholas Bellinger 314c66ac9dbSNicholas Bellinger /* 315c66ac9dbSNicholas Bellinger * If the Immediate bit is set, queue up the GOOD response 316df5fa691SChristoph Hellwig * for this SYNCHRONIZE_CACHE op. 317c66ac9dbSNicholas Bellinger */ 318c66ac9dbSNicholas Bellinger if (immed) 319c66ac9dbSNicholas Bellinger transport_complete_sync_cache(cmd, 1); 320c66ac9dbSNicholas Bellinger 321df5fa691SChristoph Hellwig bio = bio_alloc(GFP_KERNEL, 0); 322df5fa691SChristoph Hellwig bio->bi_end_io = iblock_end_io_flush; 323df5fa691SChristoph Hellwig bio->bi_bdev = ib_dev->ibd_bd; 324c66ac9dbSNicholas Bellinger if (!immed) 325df5fa691SChristoph Hellwig bio->bi_private = cmd; 326df5fa691SChristoph Hellwig submit_bio(WRITE_FLUSH, bio); 327c66ac9dbSNicholas Bellinger } 328c66ac9dbSNicholas Bellinger 329c66ac9dbSNicholas Bellinger static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range) 330c66ac9dbSNicholas Bellinger { 331c66ac9dbSNicholas Bellinger struct iblock_dev *ibd = dev->dev_ptr; 332c66ac9dbSNicholas Bellinger struct block_device *bd = ibd->ibd_bd; 333c66ac9dbSNicholas Bellinger int barrier = 0; 334c66ac9dbSNicholas Bellinger 335c66ac9dbSNicholas Bellinger return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier); 336c66ac9dbSNicholas Bellinger } 337c66ac9dbSNicholas Bellinger 338c66ac9dbSNicholas Bellinger static void iblock_free_task(struct se_task *task) 339c66ac9dbSNicholas Bellinger { 340dbbf3e94SChristoph Hellwig kfree(IBLOCK_REQ(task)); 341c66ac9dbSNicholas Bellinger } 342c66ac9dbSNicholas Bellinger 343c66ac9dbSNicholas Bellinger enum { 344c66ac9dbSNicholas Bellinger Opt_udev_path, Opt_force, Opt_err 345c66ac9dbSNicholas Bellinger }; 346c66ac9dbSNicholas Bellinger 347c66ac9dbSNicholas Bellinger static match_table_t tokens = { 348c66ac9dbSNicholas Bellinger {Opt_udev_path, "udev_path=%s"}, 349c66ac9dbSNicholas Bellinger {Opt_force, "force=%d"}, 350c66ac9dbSNicholas Bellinger {Opt_err, NULL} 351c66ac9dbSNicholas Bellinger }; 352c66ac9dbSNicholas Bellinger 353c66ac9dbSNicholas Bellinger static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba, 354c66ac9dbSNicholas Bellinger struct se_subsystem_dev *se_dev, 355c66ac9dbSNicholas Bellinger const char *page, ssize_t count) 356c66ac9dbSNicholas Bellinger { 357c66ac9dbSNicholas Bellinger struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr; 3586d180253SJesper Juhl char *orig, *ptr, *arg_p, *opts; 359c66ac9dbSNicholas Bellinger substring_t args[MAX_OPT_ARGS]; 36021bca31cSRoland Dreier int ret = 0, token; 361c66ac9dbSNicholas Bellinger 362c66ac9dbSNicholas Bellinger opts = kstrdup(page, GFP_KERNEL); 363c66ac9dbSNicholas Bellinger if (!opts) 364c66ac9dbSNicholas Bellinger return -ENOMEM; 365c66ac9dbSNicholas Bellinger 366c66ac9dbSNicholas Bellinger orig = opts; 367c66ac9dbSNicholas Bellinger 36890c161b6SSebastian Andrzej Siewior while ((ptr = strsep(&opts, ",\n")) != NULL) { 369c66ac9dbSNicholas Bellinger if (!*ptr) 370c66ac9dbSNicholas Bellinger continue; 371c66ac9dbSNicholas Bellinger 372c66ac9dbSNicholas Bellinger token = match_token(ptr, tokens, args); 373c66ac9dbSNicholas Bellinger switch (token) { 374c66ac9dbSNicholas Bellinger case Opt_udev_path: 375c66ac9dbSNicholas Bellinger if (ib_dev->ibd_bd) { 3766708bb27SAndy Grover pr_err("Unable to set udev_path= while" 377c66ac9dbSNicholas Bellinger " ib_dev->ibd_bd exists\n"); 378c66ac9dbSNicholas Bellinger ret = -EEXIST; 379c66ac9dbSNicholas Bellinger goto out; 380c66ac9dbSNicholas Bellinger } 3816d180253SJesper Juhl arg_p = match_strdup(&args[0]); 3826d180253SJesper Juhl if (!arg_p) { 3836d180253SJesper Juhl ret = -ENOMEM; 3846d180253SJesper Juhl break; 3856d180253SJesper Juhl } 3866d180253SJesper Juhl snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN, 3876d180253SJesper Juhl "%s", arg_p); 3886d180253SJesper Juhl kfree(arg_p); 3896708bb27SAndy Grover pr_debug("IBLOCK: Referencing UDEV path: %s\n", 390c66ac9dbSNicholas Bellinger ib_dev->ibd_udev_path); 391c66ac9dbSNicholas Bellinger ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; 392c66ac9dbSNicholas Bellinger break; 393c66ac9dbSNicholas Bellinger case Opt_force: 394c66ac9dbSNicholas Bellinger break; 395c66ac9dbSNicholas Bellinger default: 396c66ac9dbSNicholas Bellinger break; 397c66ac9dbSNicholas Bellinger } 398c66ac9dbSNicholas Bellinger } 399c66ac9dbSNicholas Bellinger 400c66ac9dbSNicholas Bellinger out: 401c66ac9dbSNicholas Bellinger kfree(orig); 402c66ac9dbSNicholas Bellinger return (!ret) ? count : ret; 403c66ac9dbSNicholas Bellinger } 404c66ac9dbSNicholas Bellinger 405c66ac9dbSNicholas Bellinger static ssize_t iblock_check_configfs_dev_params( 406c66ac9dbSNicholas Bellinger struct se_hba *hba, 407c66ac9dbSNicholas Bellinger struct se_subsystem_dev *se_dev) 408c66ac9dbSNicholas Bellinger { 409c66ac9dbSNicholas Bellinger struct iblock_dev *ibd = se_dev->se_dev_su_ptr; 410c66ac9dbSNicholas Bellinger 411c66ac9dbSNicholas Bellinger if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) { 4126708bb27SAndy Grover pr_err("Missing udev_path= parameters for IBLOCK\n"); 413e3d6f909SAndy Grover return -EINVAL; 414c66ac9dbSNicholas Bellinger } 415c66ac9dbSNicholas Bellinger 416c66ac9dbSNicholas Bellinger return 0; 417c66ac9dbSNicholas Bellinger } 418c66ac9dbSNicholas Bellinger 419c66ac9dbSNicholas Bellinger static ssize_t iblock_show_configfs_dev_params( 420c66ac9dbSNicholas Bellinger struct se_hba *hba, 421c66ac9dbSNicholas Bellinger struct se_subsystem_dev *se_dev, 422c66ac9dbSNicholas Bellinger char *b) 423c66ac9dbSNicholas Bellinger { 424c66ac9dbSNicholas Bellinger struct iblock_dev *ibd = se_dev->se_dev_su_ptr; 425c66ac9dbSNicholas Bellinger struct block_device *bd = ibd->ibd_bd; 426c66ac9dbSNicholas Bellinger char buf[BDEVNAME_SIZE]; 427c66ac9dbSNicholas Bellinger ssize_t bl = 0; 428c66ac9dbSNicholas Bellinger 429c66ac9dbSNicholas Bellinger if (bd) 430c66ac9dbSNicholas Bellinger bl += sprintf(b + bl, "iBlock device: %s", 431c66ac9dbSNicholas Bellinger bdevname(bd, buf)); 432c66ac9dbSNicholas Bellinger if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) { 433c66ac9dbSNicholas Bellinger bl += sprintf(b + bl, " UDEV PATH: %s\n", 434c66ac9dbSNicholas Bellinger ibd->ibd_udev_path); 435c66ac9dbSNicholas Bellinger } else 436c66ac9dbSNicholas Bellinger bl += sprintf(b + bl, "\n"); 437c66ac9dbSNicholas Bellinger 438c66ac9dbSNicholas Bellinger bl += sprintf(b + bl, " "); 439c66ac9dbSNicholas Bellinger if (bd) { 440c66ac9dbSNicholas Bellinger bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", 44121bca31cSRoland Dreier MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? 4428359cf43SJörn Engel "" : (bd->bd_holder == ibd) ? 443c66ac9dbSNicholas Bellinger "CLAIMED: IBLOCK" : "CLAIMED: OS"); 444c66ac9dbSNicholas Bellinger } else { 44521bca31cSRoland Dreier bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); 446c66ac9dbSNicholas Bellinger } 447c66ac9dbSNicholas Bellinger 448c66ac9dbSNicholas Bellinger return bl; 449c66ac9dbSNicholas Bellinger } 450c66ac9dbSNicholas Bellinger 451c66ac9dbSNicholas Bellinger static void iblock_bio_destructor(struct bio *bio) 452c66ac9dbSNicholas Bellinger { 453c66ac9dbSNicholas Bellinger struct se_task *task = bio->bi_private; 45442bf829eSChristoph Hellwig struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr; 455c66ac9dbSNicholas Bellinger 456c66ac9dbSNicholas Bellinger bio_free(bio, ib_dev->ibd_bio_set); 457c66ac9dbSNicholas Bellinger } 458c66ac9dbSNicholas Bellinger 459dbbf3e94SChristoph Hellwig static struct bio * 460dbbf3e94SChristoph Hellwig iblock_get_bio(struct se_task *task, sector_t lba, u32 sg_num) 461c66ac9dbSNicholas Bellinger { 46242bf829eSChristoph Hellwig struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr; 463dbbf3e94SChristoph Hellwig struct iblock_req *ib_req = IBLOCK_REQ(task); 464c66ac9dbSNicholas Bellinger struct bio *bio; 465c66ac9dbSNicholas Bellinger 4665c55125fSChristoph Hellwig /* 4675c55125fSChristoph Hellwig * Only allocate as many vector entries as the bio code allows us to, 4685c55125fSChristoph Hellwig * we'll loop later on until we have handled the whole request. 4695c55125fSChristoph Hellwig */ 4705c55125fSChristoph Hellwig if (sg_num > BIO_MAX_PAGES) 4715c55125fSChristoph Hellwig sg_num = BIO_MAX_PAGES; 4725c55125fSChristoph Hellwig 473c66ac9dbSNicholas Bellinger bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); 4746708bb27SAndy Grover if (!bio) { 4756708bb27SAndy Grover pr_err("Unable to allocate memory for bio\n"); 476c66ac9dbSNicholas Bellinger return NULL; 477c66ac9dbSNicholas Bellinger } 478c66ac9dbSNicholas Bellinger 4796708bb27SAndy Grover pr_debug("Allocated bio: %p task_sg_nents: %u using ibd_bio_set:" 4806708bb27SAndy Grover " %p\n", bio, task->task_sg_nents, ib_dev->ibd_bio_set); 4816708bb27SAndy Grover pr_debug("Allocated bio: %p task_size: %u\n", bio, task->task_size); 482c66ac9dbSNicholas Bellinger 483c66ac9dbSNicholas Bellinger bio->bi_bdev = ib_dev->ibd_bd; 4845951146dSAndy Grover bio->bi_private = task; 485c66ac9dbSNicholas Bellinger bio->bi_destructor = iblock_bio_destructor; 486c66ac9dbSNicholas Bellinger bio->bi_end_io = &iblock_bio_done; 487c66ac9dbSNicholas Bellinger bio->bi_sector = lba; 488d5b4a21bSChristoph Hellwig atomic_inc(&ib_req->pending); 489c66ac9dbSNicholas Bellinger 4906708bb27SAndy Grover pr_debug("Set bio->bi_sector: %llu\n", (unsigned long long)bio->bi_sector); 491d5b4a21bSChristoph Hellwig pr_debug("Set ib_req->pending: %d\n", atomic_read(&ib_req->pending)); 492c66ac9dbSNicholas Bellinger return bio; 493c66ac9dbSNicholas Bellinger } 494c66ac9dbSNicholas Bellinger 495d5b4a21bSChristoph Hellwig static void iblock_submit_bios(struct bio_list *list, int rw) 496d5b4a21bSChristoph Hellwig { 497d5b4a21bSChristoph Hellwig struct blk_plug plug; 498d5b4a21bSChristoph Hellwig struct bio *bio; 499d5b4a21bSChristoph Hellwig 500d5b4a21bSChristoph Hellwig blk_start_plug(&plug); 501d5b4a21bSChristoph Hellwig while ((bio = bio_list_pop(list))) 502d5b4a21bSChristoph Hellwig submit_bio(rw, bio); 503d5b4a21bSChristoph Hellwig blk_finish_plug(&plug); 504d5b4a21bSChristoph Hellwig } 505d5b4a21bSChristoph Hellwig 506dbbf3e94SChristoph Hellwig static int iblock_do_task(struct se_task *task) 507c66ac9dbSNicholas Bellinger { 508c66ac9dbSNicholas Bellinger struct se_cmd *cmd = task->task_se_cmd; 5095951146dSAndy Grover struct se_device *dev = cmd->se_dev; 510d5b4a21bSChristoph Hellwig struct iblock_req *ibr = IBLOCK_REQ(task); 511dbbf3e94SChristoph Hellwig struct bio *bio; 512dbbf3e94SChristoph Hellwig struct bio_list list; 513c66ac9dbSNicholas Bellinger struct scatterlist *sg; 5146708bb27SAndy Grover u32 i, sg_num = task->task_sg_nents; 515c66ac9dbSNicholas Bellinger sector_t block_lba; 516d5b4a21bSChristoph Hellwig unsigned bio_cnt; 517dbbf3e94SChristoph Hellwig int rw; 518dbbf3e94SChristoph Hellwig 519dbbf3e94SChristoph Hellwig if (task->task_data_direction == DMA_TO_DEVICE) { 520dbbf3e94SChristoph Hellwig /* 521dbbf3e94SChristoph Hellwig * Force data to disk if we pretend to not have a volatile 522dbbf3e94SChristoph Hellwig * write cache, or the initiator set the Force Unit Access bit. 523dbbf3e94SChristoph Hellwig */ 524dbbf3e94SChristoph Hellwig if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache == 0 || 525dbbf3e94SChristoph Hellwig (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && 5262d3a4b51SChristoph Hellwig (cmd->se_cmd_flags & SCF_FUA))) 527dbbf3e94SChristoph Hellwig rw = WRITE_FUA; 528dbbf3e94SChristoph Hellwig else 529dbbf3e94SChristoph Hellwig rw = WRITE; 530dbbf3e94SChristoph Hellwig } else { 531dbbf3e94SChristoph Hellwig rw = READ; 532dbbf3e94SChristoph Hellwig } 533dbbf3e94SChristoph Hellwig 534c66ac9dbSNicholas Bellinger /* 535c66ac9dbSNicholas Bellinger * Do starting conversion up from non 512-byte blocksize with 536c66ac9dbSNicholas Bellinger * struct se_task SCSI blocksize into Linux/Block 512 units for BIO. 537c66ac9dbSNicholas Bellinger */ 538e3d6f909SAndy Grover if (dev->se_sub_dev->se_dev_attrib.block_size == 4096) 539c66ac9dbSNicholas Bellinger block_lba = (task->task_lba << 3); 540e3d6f909SAndy Grover else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048) 541c66ac9dbSNicholas Bellinger block_lba = (task->task_lba << 2); 542e3d6f909SAndy Grover else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024) 543c66ac9dbSNicholas Bellinger block_lba = (task->task_lba << 1); 544e3d6f909SAndy Grover else if (dev->se_sub_dev->se_dev_attrib.block_size == 512) 545c66ac9dbSNicholas Bellinger block_lba = task->task_lba; 546c66ac9dbSNicholas Bellinger else { 5476708bb27SAndy Grover pr_err("Unsupported SCSI -> BLOCK LBA conversion:" 548e3d6f909SAndy Grover " %u\n", dev->se_sub_dev->se_dev_attrib.block_size); 54903e98c9eSNicholas Bellinger cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 55003e98c9eSNicholas Bellinger return -ENOSYS; 551c66ac9dbSNicholas Bellinger } 552c66ac9dbSNicholas Bellinger 553dbbf3e94SChristoph Hellwig bio = iblock_get_bio(task, block_lba, sg_num); 55403e98c9eSNicholas Bellinger if (!bio) { 55503e98c9eSNicholas Bellinger cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 55603e98c9eSNicholas Bellinger return -ENOMEM; 55703e98c9eSNicholas Bellinger } 558c66ac9dbSNicholas Bellinger 559dbbf3e94SChristoph Hellwig bio_list_init(&list); 560dbbf3e94SChristoph Hellwig bio_list_add(&list, bio); 561d5b4a21bSChristoph Hellwig bio_cnt = 1; 562dbbf3e94SChristoph Hellwig 5636708bb27SAndy Grover for_each_sg(task->task_sg, sg, task->task_sg_nents, i) { 564dbbf3e94SChristoph Hellwig /* 565dbbf3e94SChristoph Hellwig * XXX: if the length the device accepts is shorter than the 566dbbf3e94SChristoph Hellwig * length of the S/G list entry this will cause and 567dbbf3e94SChristoph Hellwig * endless loop. Better hope no driver uses huge pages. 568dbbf3e94SChristoph Hellwig */ 569dbbf3e94SChristoph Hellwig while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) 570dbbf3e94SChristoph Hellwig != sg->length) { 571d5b4a21bSChristoph Hellwig if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { 572d5b4a21bSChristoph Hellwig iblock_submit_bios(&list, rw); 573d5b4a21bSChristoph Hellwig bio_cnt = 0; 574d5b4a21bSChristoph Hellwig } 575d5b4a21bSChristoph Hellwig 576dbbf3e94SChristoph Hellwig bio = iblock_get_bio(task, block_lba, sg_num); 5776708bb27SAndy Grover if (!bio) 578c66ac9dbSNicholas Bellinger goto fail; 579dbbf3e94SChristoph Hellwig bio_list_add(&list, bio); 580d5b4a21bSChristoph Hellwig bio_cnt++; 581c66ac9dbSNicholas Bellinger } 582dbbf3e94SChristoph Hellwig 583c66ac9dbSNicholas Bellinger /* Always in 512 byte units for Linux/Block */ 584c66ac9dbSNicholas Bellinger block_lba += sg->length >> IBLOCK_LBA_SHIFT; 585c66ac9dbSNicholas Bellinger sg_num--; 586c66ac9dbSNicholas Bellinger } 587c66ac9dbSNicholas Bellinger 588d5b4a21bSChristoph Hellwig iblock_submit_bios(&list, rw); 589dbbf3e94SChristoph Hellwig 590d5b4a21bSChristoph Hellwig if (atomic_dec_and_test(&ibr->pending)) { 591d5b4a21bSChristoph Hellwig transport_complete_task(task, 592d5b4a21bSChristoph Hellwig !atomic_read(&ibr->ib_bio_err_cnt)); 593d5b4a21bSChristoph Hellwig } 59403e98c9eSNicholas Bellinger return 0; 595dbbf3e94SChristoph Hellwig 596c66ac9dbSNicholas Bellinger fail: 597dbbf3e94SChristoph Hellwig while ((bio = bio_list_pop(&list))) 598c66ac9dbSNicholas Bellinger bio_put(bio); 59903e98c9eSNicholas Bellinger cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 60003e98c9eSNicholas Bellinger return -ENOMEM; 601c66ac9dbSNicholas Bellinger } 602c66ac9dbSNicholas Bellinger 603c66ac9dbSNicholas Bellinger static u32 iblock_get_device_rev(struct se_device *dev) 604c66ac9dbSNicholas Bellinger { 605c66ac9dbSNicholas Bellinger return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ 606c66ac9dbSNicholas Bellinger } 607c66ac9dbSNicholas Bellinger 608c66ac9dbSNicholas Bellinger static u32 iblock_get_device_type(struct se_device *dev) 609c66ac9dbSNicholas Bellinger { 610c66ac9dbSNicholas Bellinger return TYPE_DISK; 611c66ac9dbSNicholas Bellinger } 612c66ac9dbSNicholas Bellinger 613c66ac9dbSNicholas Bellinger static sector_t iblock_get_blocks(struct se_device *dev) 614c66ac9dbSNicholas Bellinger { 615c66ac9dbSNicholas Bellinger struct iblock_dev *ibd = dev->dev_ptr; 616c66ac9dbSNicholas Bellinger struct block_device *bd = ibd->ibd_bd; 617c66ac9dbSNicholas Bellinger struct request_queue *q = bdev_get_queue(bd); 618c66ac9dbSNicholas Bellinger 619c66ac9dbSNicholas Bellinger return iblock_emulate_read_cap_with_block_size(dev, bd, q); 620c66ac9dbSNicholas Bellinger } 621c66ac9dbSNicholas Bellinger 622c66ac9dbSNicholas Bellinger static void iblock_bio_done(struct bio *bio, int err) 623c66ac9dbSNicholas Bellinger { 624c66ac9dbSNicholas Bellinger struct se_task *task = bio->bi_private; 625c66ac9dbSNicholas Bellinger struct iblock_req *ibr = IBLOCK_REQ(task); 626dbbf3e94SChristoph Hellwig 627c66ac9dbSNicholas Bellinger /* 628c66ac9dbSNicholas Bellinger * Set -EIO if !BIO_UPTODATE and the passed is still err=0 629c66ac9dbSNicholas Bellinger */ 6306708bb27SAndy Grover if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) 631c66ac9dbSNicholas Bellinger err = -EIO; 632c66ac9dbSNicholas Bellinger 633c66ac9dbSNicholas Bellinger if (err != 0) { 6346708bb27SAndy Grover pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," 635c66ac9dbSNicholas Bellinger " err: %d\n", bio, err); 636c66ac9dbSNicholas Bellinger /* 637c66ac9dbSNicholas Bellinger * Bump the ib_bio_err_cnt and release bio. 638c66ac9dbSNicholas Bellinger */ 639c66ac9dbSNicholas Bellinger atomic_inc(&ibr->ib_bio_err_cnt); 640c66ac9dbSNicholas Bellinger smp_mb__after_atomic_inc(); 641dbbf3e94SChristoph Hellwig } 642dbbf3e94SChristoph Hellwig 643c66ac9dbSNicholas Bellinger bio_put(bio); 644dbbf3e94SChristoph Hellwig 645d5b4a21bSChristoph Hellwig if (!atomic_dec_and_test(&ibr->pending)) 646c66ac9dbSNicholas Bellinger return; 647c66ac9dbSNicholas Bellinger 6486708bb27SAndy Grover pr_debug("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n", 649dbbf3e94SChristoph Hellwig task, bio, task->task_lba, 650dbbf3e94SChristoph Hellwig (unsigned long long)bio->bi_sector, err); 651dbbf3e94SChristoph Hellwig 652dbbf3e94SChristoph Hellwig transport_complete_task(task, !atomic_read(&ibr->ib_bio_err_cnt)); 653c66ac9dbSNicholas Bellinger } 654c66ac9dbSNicholas Bellinger 655c66ac9dbSNicholas Bellinger static struct se_subsystem_api iblock_template = { 656c66ac9dbSNicholas Bellinger .name = "iblock", 657c66ac9dbSNicholas Bellinger .owner = THIS_MODULE, 658c66ac9dbSNicholas Bellinger .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 659f55918faSChristoph Hellwig .write_cache_emulated = 1, 660f55918faSChristoph Hellwig .fua_write_emulated = 1, 661c66ac9dbSNicholas Bellinger .attach_hba = iblock_attach_hba, 662c66ac9dbSNicholas Bellinger .detach_hba = iblock_detach_hba, 663c66ac9dbSNicholas Bellinger .allocate_virtdevice = iblock_allocate_virtdevice, 664c66ac9dbSNicholas Bellinger .create_virtdevice = iblock_create_virtdevice, 665c66ac9dbSNicholas Bellinger .free_device = iblock_free_device, 666c66ac9dbSNicholas Bellinger .alloc_task = iblock_alloc_task, 667c66ac9dbSNicholas Bellinger .do_task = iblock_do_task, 668c66ac9dbSNicholas Bellinger .do_discard = iblock_do_discard, 669c66ac9dbSNicholas Bellinger .do_sync_cache = iblock_emulate_sync_cache, 670c66ac9dbSNicholas Bellinger .free_task = iblock_free_task, 671c66ac9dbSNicholas Bellinger .check_configfs_dev_params = iblock_check_configfs_dev_params, 672c66ac9dbSNicholas Bellinger .set_configfs_dev_params = iblock_set_configfs_dev_params, 673c66ac9dbSNicholas Bellinger .show_configfs_dev_params = iblock_show_configfs_dev_params, 674c66ac9dbSNicholas Bellinger .get_device_rev = iblock_get_device_rev, 675c66ac9dbSNicholas Bellinger .get_device_type = iblock_get_device_type, 676c66ac9dbSNicholas Bellinger .get_blocks = iblock_get_blocks, 677c66ac9dbSNicholas Bellinger }; 678c66ac9dbSNicholas Bellinger 679c66ac9dbSNicholas Bellinger static int __init iblock_module_init(void) 680c66ac9dbSNicholas Bellinger { 681c66ac9dbSNicholas Bellinger return transport_subsystem_register(&iblock_template); 682c66ac9dbSNicholas Bellinger } 683c66ac9dbSNicholas Bellinger 684c66ac9dbSNicholas Bellinger static void iblock_module_exit(void) 685c66ac9dbSNicholas Bellinger { 686c66ac9dbSNicholas Bellinger transport_subsystem_release(&iblock_template); 687c66ac9dbSNicholas Bellinger } 688c66ac9dbSNicholas Bellinger 689c66ac9dbSNicholas Bellinger MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); 690c66ac9dbSNicholas Bellinger MODULE_AUTHOR("nab@Linux-iSCSI.org"); 691c66ac9dbSNicholas Bellinger MODULE_LICENSE("GPL"); 692c66ac9dbSNicholas Bellinger 693c66ac9dbSNicholas Bellinger module_init(iblock_module_init); 694c66ac9dbSNicholas Bellinger module_exit(iblock_module_exit); 695