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 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 30 | #include <linux/string.h> |
| 31 | #include <linux/parser.h> |
| 32 | #include <linux/timer.h> |
| 33 | #include <linux/fs.h> |
| 34 | #include <linux/blkdev.h> |
| 35 | #include <linux/slab.h> |
| 36 | #include <linux/spinlock.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 37 | #include <linux/bio.h> |
| 38 | #include <linux/genhd.h> |
| 39 | #include <linux/file.h> |
Paul Gortmaker | 827509e | 2011-08-30 14:20:44 -0400 | [diff] [blame] | 40 | #include <linux/module.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 41 | #include <scsi/scsi.h> |
| 42 | #include <scsi/scsi_host.h> |
| 43 | |
| 44 | #include <target/target_core_base.h> |
Christoph Hellwig | c4795fb | 2011-11-16 09:46:48 -0500 | [diff] [blame] | 45 | #include <target/target_core_backend.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 46 | |
| 47 | #include "target_core_iblock.h" |
| 48 | |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 49 | #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
| 50 | #define IBLOCK_BIO_POOL_SIZE 128 |
| 51 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 52 | static struct se_subsystem_api iblock_template; |
| 53 | |
| 54 | static void iblock_bio_done(struct bio *, int); |
| 55 | |
| 56 | /* iblock_attach_hba(): (Part of se_subsystem_api_t template) |
| 57 | * |
| 58 | * |
| 59 | */ |
| 60 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) |
| 61 | { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 62 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 63 | " Generic Target Core Stack %s\n", hba->hba_id, |
| 64 | IBLOCK_VERSION, TARGET_CORE_MOD_VERSION); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | static void iblock_detach_hba(struct se_hba *hba) |
| 69 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name) |
| 73 | { |
| 74 | struct iblock_dev *ib_dev = NULL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 75 | |
| 76 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 77 | if (!ib_dev) { |
| 78 | pr_err("Unable to allocate struct iblock_dev\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 79 | return NULL; |
| 80 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 81 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 82 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 83 | |
| 84 | return ib_dev; |
| 85 | } |
| 86 | |
| 87 | static struct se_device *iblock_create_virtdevice( |
| 88 | struct se_hba *hba, |
| 89 | struct se_subsystem_dev *se_dev, |
| 90 | void *p) |
| 91 | { |
| 92 | struct iblock_dev *ib_dev = p; |
| 93 | struct se_device *dev; |
| 94 | struct se_dev_limits dev_limits; |
| 95 | struct block_device *bd = NULL; |
| 96 | struct request_queue *q; |
| 97 | struct queue_limits *limits; |
| 98 | u32 dev_flags = 0; |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 99 | int ret = -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 100 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 101 | if (!ib_dev) { |
| 102 | pr_err("Unable to locate struct iblock_dev parameter\n"); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 103 | return ERR_PTR(ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 104 | } |
| 105 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 106 | |
| 107 | ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 108 | if (!ib_dev->ibd_bio_set) { |
| 109 | pr_err("IBLOCK: Unable to create bioset()\n"); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 110 | return ERR_PTR(-ENOMEM); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 111 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 112 | pr_debug("IBLOCK: Created bio_set()\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 113 | /* |
| 114 | * iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path |
| 115 | * must already have been set in order for echo 1 > $HBA/$DEV/enable to run. |
| 116 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 117 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 118 | ib_dev->ibd_udev_path); |
| 119 | |
| 120 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, |
| 121 | FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 122 | if (IS_ERR(bd)) { |
| 123 | ret = PTR_ERR(bd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 124 | goto failed; |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 125 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 126 | /* |
| 127 | * Setup the local scope queue_limits from struct request_queue->limits |
| 128 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. |
| 129 | */ |
| 130 | q = bdev_get_queue(bd); |
| 131 | limits = &dev_limits.limits; |
| 132 | limits->logical_block_size = bdev_logical_block_size(bd); |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 133 | limits->max_hw_sectors = UINT_MAX; |
| 134 | limits->max_sectors = UINT_MAX; |
Nicholas Bellinger | 8f3d14e | 2011-06-22 01:32:20 -0700 | [diff] [blame] | 135 | dev_limits.hw_queue_depth = q->nr_requests; |
| 136 | dev_limits.queue_depth = q->nr_requests; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 137 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 138 | ib_dev->ibd_bd = bd; |
| 139 | |
| 140 | dev = transport_add_device_to_core_hba(hba, |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 141 | &iblock_template, se_dev, dev_flags, ib_dev, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 142 | &dev_limits, "IBLOCK", IBLOCK_VERSION); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 143 | if (!dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 144 | goto failed; |
| 145 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 146 | /* |
| 147 | * Check if the underlying struct block_device request_queue supports |
| 148 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM |
| 149 | * in ATA and we need to set TPE=1 |
| 150 | */ |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 151 | if (blk_queue_discard(q)) { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 152 | dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count = |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 153 | q->limits.max_discard_sectors; |
| 154 | /* |
| 155 | * Currently hardcoded to 1 in Linux/SCSI code.. |
| 156 | */ |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 157 | dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count = 1; |
| 158 | dev->se_sub_dev->se_dev_attrib.unmap_granularity = |
Marco Sanvido | 7347b5f | 2012-01-20 15:49:27 -0800 | [diff] [blame] | 159 | q->limits.discard_granularity >> 9; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 160 | dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment = |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 161 | q->limits.discard_alignment; |
| 162 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 163 | pr_debug("IBLOCK: BLOCK Discard support available," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 164 | " disabled by default\n"); |
| 165 | } |
| 166 | |
Roland Dreier | e22a7f0 | 2011-07-05 13:34:52 -0700 | [diff] [blame] | 167 | if (blk_queue_nonrot(q)) |
| 168 | dev->se_sub_dev->se_dev_attrib.is_nonrot = 1; |
| 169 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 170 | return dev; |
| 171 | |
| 172 | failed: |
| 173 | if (ib_dev->ibd_bio_set) { |
| 174 | bioset_free(ib_dev->ibd_bio_set); |
| 175 | ib_dev->ibd_bio_set = NULL; |
| 176 | } |
| 177 | ib_dev->ibd_bd = NULL; |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 178 | return ERR_PTR(ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | static void iblock_free_device(void *p) |
| 182 | { |
| 183 | struct iblock_dev *ib_dev = p; |
| 184 | |
Nicholas Bellinger | bc66552 | 2011-02-09 15:34:38 -0800 | [diff] [blame] | 185 | if (ib_dev->ibd_bd != NULL) |
| 186 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); |
| 187 | if (ib_dev->ibd_bio_set != NULL) |
| 188 | bioset_free(ib_dev->ibd_bio_set); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 189 | kfree(ib_dev); |
| 190 | } |
| 191 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 192 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
| 193 | struct se_device *dev, |
| 194 | struct block_device *bd, |
| 195 | struct request_queue *q) |
| 196 | { |
| 197 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), |
| 198 | bdev_logical_block_size(bd)) - 1); |
| 199 | u32 block_size = bdev_logical_block_size(bd); |
| 200 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 201 | if (block_size == dev->se_sub_dev->se_dev_attrib.block_size) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 202 | return blocks_long; |
| 203 | |
| 204 | switch (block_size) { |
| 205 | case 4096: |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 206 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 207 | case 2048: |
| 208 | blocks_long <<= 1; |
| 209 | break; |
| 210 | case 1024: |
| 211 | blocks_long <<= 2; |
| 212 | break; |
| 213 | case 512: |
| 214 | blocks_long <<= 3; |
| 215 | default: |
| 216 | break; |
| 217 | } |
| 218 | break; |
| 219 | case 2048: |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 220 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 221 | case 4096: |
| 222 | blocks_long >>= 1; |
| 223 | break; |
| 224 | case 1024: |
| 225 | blocks_long <<= 1; |
| 226 | break; |
| 227 | case 512: |
| 228 | blocks_long <<= 2; |
| 229 | break; |
| 230 | default: |
| 231 | break; |
| 232 | } |
| 233 | break; |
| 234 | case 1024: |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 235 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 236 | case 4096: |
| 237 | blocks_long >>= 2; |
| 238 | break; |
| 239 | case 2048: |
| 240 | blocks_long >>= 1; |
| 241 | break; |
| 242 | case 512: |
| 243 | blocks_long <<= 1; |
| 244 | break; |
| 245 | default: |
| 246 | break; |
| 247 | } |
| 248 | break; |
| 249 | case 512: |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 250 | switch (dev->se_sub_dev->se_dev_attrib.block_size) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 251 | case 4096: |
| 252 | blocks_long >>= 3; |
| 253 | break; |
| 254 | case 2048: |
| 255 | blocks_long >>= 2; |
| 256 | break; |
| 257 | case 1024: |
| 258 | blocks_long >>= 1; |
| 259 | break; |
| 260 | default: |
| 261 | break; |
| 262 | } |
| 263 | break; |
| 264 | default: |
| 265 | break; |
| 266 | } |
| 267 | |
| 268 | return blocks_long; |
| 269 | } |
| 270 | |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 271 | static void iblock_end_io_flush(struct bio *bio, int err) |
| 272 | { |
| 273 | struct se_cmd *cmd = bio->bi_private; |
| 274 | |
| 275 | if (err) |
| 276 | pr_err("IBLOCK: cache flush failed: %d\n", err); |
| 277 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 278 | if (cmd) { |
| 279 | if (err) { |
| 280 | cmd->scsi_sense_reason = |
| 281 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 282 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
| 283 | } else { |
| 284 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
| 285 | } |
| 286 | } |
| 287 | |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 288 | bio_put(bio); |
| 289 | } |
| 290 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 291 | /* |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 292 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
| 293 | * always flush the whole cache. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 294 | */ |
Christoph Hellwig | 6bb35e0 | 2012-04-23 11:35:33 -0400 | [diff] [blame] | 295 | static void iblock_emulate_sync_cache(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 296 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 297 | struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 298 | int immed = (cmd->t_task_cdb[1] & 0x2); |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 299 | struct bio *bio; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 300 | |
| 301 | /* |
| 302 | * If the Immediate bit is set, queue up the GOOD response |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 303 | * for this SYNCHRONIZE_CACHE op. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 304 | */ |
| 305 | if (immed) |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 306 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 307 | |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 308 | bio = bio_alloc(GFP_KERNEL, 0); |
| 309 | bio->bi_end_io = iblock_end_io_flush; |
| 310 | bio->bi_bdev = ib_dev->ibd_bd; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 311 | if (!immed) |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 312 | bio->bi_private = cmd; |
| 313 | submit_bio(WRITE_FLUSH, bio); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 314 | } |
| 315 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 316 | static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range) |
| 317 | { |
| 318 | struct iblock_dev *ibd = dev->dev_ptr; |
| 319 | struct block_device *bd = ibd->ibd_bd; |
| 320 | int barrier = 0; |
| 321 | |
| 322 | return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier); |
| 323 | } |
| 324 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 325 | enum { |
| 326 | Opt_udev_path, Opt_force, Opt_err |
| 327 | }; |
| 328 | |
| 329 | static match_table_t tokens = { |
| 330 | {Opt_udev_path, "udev_path=%s"}, |
| 331 | {Opt_force, "force=%d"}, |
| 332 | {Opt_err, NULL} |
| 333 | }; |
| 334 | |
| 335 | static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba, |
| 336 | struct se_subsystem_dev *se_dev, |
| 337 | const char *page, ssize_t count) |
| 338 | { |
| 339 | struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr; |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 340 | char *orig, *ptr, *arg_p, *opts; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 341 | substring_t args[MAX_OPT_ARGS]; |
Roland Dreier | 21bca31 | 2011-07-05 15:35:02 -0700 | [diff] [blame] | 342 | int ret = 0, token; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 343 | |
| 344 | opts = kstrdup(page, GFP_KERNEL); |
| 345 | if (!opts) |
| 346 | return -ENOMEM; |
| 347 | |
| 348 | orig = opts; |
| 349 | |
Sebastian Andrzej Siewior | 90c161b | 2011-11-23 20:53:17 +0100 | [diff] [blame] | 350 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 351 | if (!*ptr) |
| 352 | continue; |
| 353 | |
| 354 | token = match_token(ptr, tokens, args); |
| 355 | switch (token) { |
| 356 | case Opt_udev_path: |
| 357 | if (ib_dev->ibd_bd) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 358 | pr_err("Unable to set udev_path= while" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 359 | " ib_dev->ibd_bd exists\n"); |
| 360 | ret = -EEXIST; |
| 361 | goto out; |
| 362 | } |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 363 | arg_p = match_strdup(&args[0]); |
| 364 | if (!arg_p) { |
| 365 | ret = -ENOMEM; |
| 366 | break; |
| 367 | } |
| 368 | snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN, |
| 369 | "%s", arg_p); |
| 370 | kfree(arg_p); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 371 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 372 | ib_dev->ibd_udev_path); |
| 373 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; |
| 374 | break; |
| 375 | case Opt_force: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 376 | break; |
| 377 | default: |
| 378 | break; |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | out: |
| 383 | kfree(orig); |
| 384 | return (!ret) ? count : ret; |
| 385 | } |
| 386 | |
| 387 | static ssize_t iblock_check_configfs_dev_params( |
| 388 | struct se_hba *hba, |
| 389 | struct se_subsystem_dev *se_dev) |
| 390 | { |
| 391 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; |
| 392 | |
| 393 | if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 394 | pr_err("Missing udev_path= parameters for IBLOCK\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 395 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 396 | } |
| 397 | |
| 398 | return 0; |
| 399 | } |
| 400 | |
| 401 | static ssize_t iblock_show_configfs_dev_params( |
| 402 | struct se_hba *hba, |
| 403 | struct se_subsystem_dev *se_dev, |
| 404 | char *b) |
| 405 | { |
| 406 | struct iblock_dev *ibd = se_dev->se_dev_su_ptr; |
| 407 | struct block_device *bd = ibd->ibd_bd; |
| 408 | char buf[BDEVNAME_SIZE]; |
| 409 | ssize_t bl = 0; |
| 410 | |
| 411 | if (bd) |
| 412 | bl += sprintf(b + bl, "iBlock device: %s", |
| 413 | bdevname(bd, buf)); |
| 414 | if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) { |
| 415 | bl += sprintf(b + bl, " UDEV PATH: %s\n", |
| 416 | ibd->ibd_udev_path); |
| 417 | } else |
| 418 | bl += sprintf(b + bl, "\n"); |
| 419 | |
| 420 | bl += sprintf(b + bl, " "); |
| 421 | if (bd) { |
| 422 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", |
Roland Dreier | 21bca31 | 2011-07-05 15:35:02 -0700 | [diff] [blame] | 423 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
Jörn Engel | 8359cf4 | 2011-11-24 02:05:51 +0100 | [diff] [blame] | 424 | "" : (bd->bd_holder == ibd) ? |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 425 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
| 426 | } else { |
Roland Dreier | 21bca31 | 2011-07-05 15:35:02 -0700 | [diff] [blame] | 427 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | return bl; |
| 431 | } |
| 432 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 433 | static void iblock_complete_cmd(struct se_cmd *cmd) |
| 434 | { |
| 435 | struct iblock_req *ibr = cmd->priv; |
| 436 | u8 status; |
| 437 | |
| 438 | if (!atomic_dec_and_test(&ibr->pending)) |
| 439 | return; |
| 440 | |
| 441 | if (atomic_read(&ibr->ib_bio_err_cnt)) |
| 442 | status = SAM_STAT_CHECK_CONDITION; |
| 443 | else |
| 444 | status = SAM_STAT_GOOD; |
| 445 | |
| 446 | target_complete_cmd(cmd, status); |
| 447 | kfree(ibr); |
| 448 | } |
| 449 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 450 | static void iblock_bio_destructor(struct bio *bio) |
| 451 | { |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 452 | struct se_cmd *cmd = bio->bi_private; |
| 453 | struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 454 | |
| 455 | bio_free(bio, ib_dev->ibd_bio_set); |
| 456 | } |
| 457 | |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 458 | static struct bio * |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 459 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 460 | { |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 461 | struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 462 | struct bio *bio; |
| 463 | |
Christoph Hellwig | 5c55125 | 2012-02-02 16:51:24 -0500 | [diff] [blame] | 464 | /* |
| 465 | * Only allocate as many vector entries as the bio code allows us to, |
| 466 | * we'll loop later on until we have handled the whole request. |
| 467 | */ |
| 468 | if (sg_num > BIO_MAX_PAGES) |
| 469 | sg_num = BIO_MAX_PAGES; |
| 470 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 471 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 472 | if (!bio) { |
| 473 | pr_err("Unable to allocate memory for bio\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 474 | return NULL; |
| 475 | } |
| 476 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 477 | bio->bi_bdev = ib_dev->ibd_bd; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 478 | bio->bi_private = cmd; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 479 | bio->bi_destructor = iblock_bio_destructor; |
| 480 | bio->bi_end_io = &iblock_bio_done; |
| 481 | bio->bi_sector = lba; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 482 | return bio; |
| 483 | } |
| 484 | |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 485 | static void iblock_submit_bios(struct bio_list *list, int rw) |
| 486 | { |
| 487 | struct blk_plug plug; |
| 488 | struct bio *bio; |
| 489 | |
| 490 | blk_start_plug(&plug); |
| 491 | while ((bio = bio_list_pop(list))) |
| 492 | submit_bio(rw, bio); |
| 493 | blk_finish_plug(&plug); |
| 494 | } |
| 495 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 496 | static int iblock_execute_cmd(struct se_cmd *cmd, struct scatterlist *sgl, |
| 497 | u32 sgl_nents, enum dma_data_direction data_direction) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 498 | { |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 499 | struct se_device *dev = cmd->se_dev; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 500 | struct iblock_req *ibr; |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 501 | struct bio *bio; |
| 502 | struct bio_list list; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 503 | struct scatterlist *sg; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 504 | u32 sg_num = sgl_nents; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 505 | sector_t block_lba; |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 506 | unsigned bio_cnt; |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 507 | int rw; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 508 | int i; |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 509 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 510 | if (data_direction == DMA_TO_DEVICE) { |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 511 | /* |
| 512 | * Force data to disk if we pretend to not have a volatile |
| 513 | * write cache, or the initiator set the Force Unit Access bit. |
| 514 | */ |
| 515 | if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache == 0 || |
| 516 | (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && |
Christoph Hellwig | 2d3a4b5 | 2011-11-14 11:36:29 -0500 | [diff] [blame] | 517 | (cmd->se_cmd_flags & SCF_FUA))) |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 518 | rw = WRITE_FUA; |
| 519 | else |
| 520 | rw = WRITE; |
| 521 | } else { |
| 522 | rw = READ; |
| 523 | } |
| 524 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 525 | /* |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 526 | * Convert the blocksize advertised to the initiator to the 512 byte |
| 527 | * units unconditionally used by the Linux block layer. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 528 | */ |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 529 | if (dev->se_sub_dev->se_dev_attrib.block_size == 4096) |
Christoph Hellwig | 72a0e5e | 2012-04-23 11:35:30 -0400 | [diff] [blame] | 530 | block_lba = (cmd->t_task_lba << 3); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 531 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048) |
Christoph Hellwig | 72a0e5e | 2012-04-23 11:35:30 -0400 | [diff] [blame] | 532 | block_lba = (cmd->t_task_lba << 2); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 533 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024) |
Christoph Hellwig | 72a0e5e | 2012-04-23 11:35:30 -0400 | [diff] [blame] | 534 | block_lba = (cmd->t_task_lba << 1); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 535 | else if (dev->se_sub_dev->se_dev_attrib.block_size == 512) |
Christoph Hellwig | 72a0e5e | 2012-04-23 11:35:30 -0400 | [diff] [blame] | 536 | block_lba = cmd->t_task_lba; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 537 | else { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 538 | pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 539 | " %u\n", dev->se_sub_dev->se_dev_attrib.block_size); |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 540 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 541 | return -ENOSYS; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 542 | } |
| 543 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 544 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
| 545 | if (!ibr) |
| 546 | goto fail; |
| 547 | cmd->priv = ibr; |
| 548 | |
| 549 | bio = iblock_get_bio(cmd, block_lba, sgl_nents); |
| 550 | if (!bio) |
| 551 | goto fail_free_ibr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 552 | |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 553 | bio_list_init(&list); |
| 554 | bio_list_add(&list, bio); |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 555 | |
| 556 | atomic_set(&ibr->pending, 2); |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 557 | bio_cnt = 1; |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 558 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 559 | for_each_sg(sgl, sg, sgl_nents, i) { |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 560 | /* |
| 561 | * XXX: if the length the device accepts is shorter than the |
| 562 | * length of the S/G list entry this will cause and |
| 563 | * endless loop. Better hope no driver uses huge pages. |
| 564 | */ |
| 565 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) |
| 566 | != sg->length) { |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 567 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
| 568 | iblock_submit_bios(&list, rw); |
| 569 | bio_cnt = 0; |
| 570 | } |
| 571 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 572 | bio = iblock_get_bio(cmd, block_lba, sg_num); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 573 | if (!bio) |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 574 | goto fail_put_bios; |
| 575 | |
| 576 | atomic_inc(&ibr->pending); |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 577 | bio_list_add(&list, bio); |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 578 | bio_cnt++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 579 | } |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 580 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 581 | /* Always in 512 byte units for Linux/Block */ |
| 582 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; |
| 583 | sg_num--; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 584 | } |
| 585 | |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 586 | iblock_submit_bios(&list, rw); |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 587 | iblock_complete_cmd(cmd); |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 588 | return 0; |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 589 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 590 | fail_put_bios: |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 591 | while ((bio = bio_list_pop(&list))) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 592 | bio_put(bio); |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 593 | fail_free_ibr: |
| 594 | kfree(ibr); |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 595 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 596 | fail: |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 597 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 598 | } |
| 599 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 600 | static u32 iblock_get_device_rev(struct se_device *dev) |
| 601 | { |
| 602 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ |
| 603 | } |
| 604 | |
| 605 | static u32 iblock_get_device_type(struct se_device *dev) |
| 606 | { |
| 607 | return TYPE_DISK; |
| 608 | } |
| 609 | |
| 610 | static sector_t iblock_get_blocks(struct se_device *dev) |
| 611 | { |
| 612 | struct iblock_dev *ibd = dev->dev_ptr; |
| 613 | struct block_device *bd = ibd->ibd_bd; |
| 614 | struct request_queue *q = bdev_get_queue(bd); |
| 615 | |
| 616 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); |
| 617 | } |
| 618 | |
| 619 | static void iblock_bio_done(struct bio *bio, int err) |
| 620 | { |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 621 | struct se_cmd *cmd = bio->bi_private; |
| 622 | struct iblock_req *ibr = cmd->priv; |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 623 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 624 | /* |
| 625 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 |
| 626 | */ |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 627 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 628 | err = -EIO; |
| 629 | |
| 630 | if (err != 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 631 | pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 632 | " err: %d\n", bio, err); |
| 633 | /* |
| 634 | * Bump the ib_bio_err_cnt and release bio. |
| 635 | */ |
| 636 | atomic_inc(&ibr->ib_bio_err_cnt); |
| 637 | smp_mb__after_atomic_inc(); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 638 | } |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 639 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 640 | bio_put(bio); |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 641 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 642 | iblock_complete_cmd(cmd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 643 | } |
| 644 | |
| 645 | static struct se_subsystem_api iblock_template = { |
| 646 | .name = "iblock", |
| 647 | .owner = THIS_MODULE, |
| 648 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, |
Christoph Hellwig | f55918f | 2011-10-14 07:30:17 -0400 | [diff] [blame] | 649 | .write_cache_emulated = 1, |
| 650 | .fua_write_emulated = 1, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 651 | .attach_hba = iblock_attach_hba, |
| 652 | .detach_hba = iblock_detach_hba, |
| 653 | .allocate_virtdevice = iblock_allocate_virtdevice, |
| 654 | .create_virtdevice = iblock_create_virtdevice, |
| 655 | .free_device = iblock_free_device, |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 656 | .execute_cmd = iblock_execute_cmd, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 657 | .do_discard = iblock_do_discard, |
| 658 | .do_sync_cache = iblock_emulate_sync_cache, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 659 | .check_configfs_dev_params = iblock_check_configfs_dev_params, |
| 660 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
| 661 | .show_configfs_dev_params = iblock_show_configfs_dev_params, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 662 | .get_device_rev = iblock_get_device_rev, |
| 663 | .get_device_type = iblock_get_device_type, |
| 664 | .get_blocks = iblock_get_blocks, |
| 665 | }; |
| 666 | |
| 667 | static int __init iblock_module_init(void) |
| 668 | { |
| 669 | return transport_subsystem_register(&iblock_template); |
| 670 | } |
| 671 | |
| 672 | static void iblock_module_exit(void) |
| 673 | { |
| 674 | transport_subsystem_release(&iblock_template); |
| 675 | } |
| 676 | |
| 677 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); |
| 678 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); |
| 679 | MODULE_LICENSE("GPL"); |
| 680 | |
| 681 | module_init(iblock_module_init); |
| 682 | module_exit(iblock_module_exit); |