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 | * |
Nicholas Bellinger | 4c76251 | 2013-09-05 15:29:12 -0700 | [diff] [blame] | 7 | * (c) Copyright 2003-2013 Datera, Inc. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 8 | * |
| 9 | * Nicholas A. Bellinger <nab@kernel.org> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 24 | * |
| 25 | ******************************************************************************/ |
| 26 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 27 | #include <linux/string.h> |
| 28 | #include <linux/parser.h> |
| 29 | #include <linux/timer.h> |
| 30 | #include <linux/fs.h> |
| 31 | #include <linux/blkdev.h> |
| 32 | #include <linux/slab.h> |
| 33 | #include <linux/spinlock.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 34 | #include <linux/bio.h> |
| 35 | #include <linux/genhd.h> |
| 36 | #include <linux/file.h> |
Paul Gortmaker | 827509e | 2011-08-30 14:20:44 -0400 | [diff] [blame] | 37 | #include <linux/module.h> |
Bart Van Assche | ba92999 | 2015-05-08 10:11:12 +0200 | [diff] [blame] | 38 | #include <scsi/scsi_proto.h> |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 39 | #include <asm/unaligned.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 40 | |
| 41 | #include <target/target_core_base.h> |
Christoph Hellwig | c4795fb | 2011-11-16 09:46:48 -0500 | [diff] [blame] | 42 | #include <target/target_core_backend.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 43 | |
| 44 | #include "target_core_iblock.h" |
| 45 | |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 46 | #define IBLOCK_MAX_BIO_PER_TASK 32 /* max # of bios to submit at a time */ |
| 47 | #define IBLOCK_BIO_POOL_SIZE 128 |
| 48 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 49 | static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev) |
| 50 | { |
| 51 | return container_of(dev, struct iblock_dev, dev); |
| 52 | } |
| 53 | |
| 54 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 55 | static int iblock_attach_hba(struct se_hba *hba, u32 host_id) |
| 56 | { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 57 | pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 58 | " Generic Target Core Stack %s\n", hba->hba_id, |
Christoph Hellwig | ce8dd25 | 2015-06-19 15:14:39 +0200 | [diff] [blame] | 59 | IBLOCK_VERSION, TARGET_CORE_VERSION); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static void iblock_detach_hba(struct se_hba *hba) |
| 64 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 65 | } |
| 66 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 67 | static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 68 | { |
| 69 | struct iblock_dev *ib_dev = NULL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 70 | |
| 71 | ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 72 | if (!ib_dev) { |
| 73 | pr_err("Unable to allocate struct iblock_dev\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 74 | return NULL; |
| 75 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 76 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 77 | pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 78 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 79 | return &ib_dev->dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 80 | } |
| 81 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 82 | static int iblock_configure_device(struct se_device *dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 83 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 84 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 85 | struct request_queue *q; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 86 | struct block_device *bd = NULL; |
Nicholas Bellinger | ecebbf6 | 2013-12-23 20:31:24 +0000 | [diff] [blame] | 87 | struct blk_integrity *bi; |
Andy Grover | 44bfd01 | 2012-06-07 10:38:51 -0700 | [diff] [blame] | 88 | fmode_t mode; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 89 | int ret = -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 90 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 91 | if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) { |
| 92 | pr_err("Missing udev_path= parameters for IBLOCK\n"); |
| 93 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 94 | } |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 95 | |
| 96 | ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 97 | if (!ib_dev->ibd_bio_set) { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 98 | pr_err("IBLOCK: Unable to create bioset\n"); |
| 99 | goto out; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 100 | } |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 101 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 102 | pr_debug( "IBLOCK: Claiming struct block_device: %s\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 103 | ib_dev->ibd_udev_path); |
| 104 | |
Andy Grover | 44bfd01 | 2012-06-07 10:38:51 -0700 | [diff] [blame] | 105 | mode = FMODE_READ|FMODE_EXCL; |
| 106 | if (!ib_dev->ibd_readonly) |
| 107 | mode |= FMODE_WRITE; |
| 108 | |
| 109 | bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 110 | if (IS_ERR(bd)) { |
| 111 | ret = PTR_ERR(bd); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 112 | goto out_free_bioset; |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 113 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 114 | ib_dev->ibd_bd = bd; |
| 115 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 116 | q = bdev_get_queue(bd); |
| 117 | |
| 118 | dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd); |
Nicholas Bellinger | 046ba64 | 2015-01-06 16:10:37 -0800 | [diff] [blame] | 119 | dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 120 | dev->dev_attrib.hw_queue_depth = q->nr_requests; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 121 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 122 | /* |
| 123 | * Check if the underlying struct block_device request_queue supports |
| 124 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM |
| 125 | * in ATA and we need to set TPE=1 |
| 126 | */ |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 127 | if (blk_queue_discard(q)) { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 128 | dev->dev_attrib.max_unmap_lba_count = |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 129 | q->limits.max_discard_sectors; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 130 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 131 | /* |
| 132 | * Currently hardcoded to 1 in Linux/SCSI code.. |
| 133 | */ |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 134 | dev->dev_attrib.max_unmap_block_desc_count = 1; |
| 135 | dev->dev_attrib.unmap_granularity = |
Marco Sanvido | 7347b5f | 2012-01-20 15:49:27 -0800 | [diff] [blame] | 136 | q->limits.discard_granularity >> 9; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 137 | dev->dev_attrib.unmap_granularity_alignment = |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 138 | q->limits.discard_alignment; |
| 139 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 140 | pr_debug("IBLOCK: BLOCK Discard support available," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 141 | " disabled by default\n"); |
| 142 | } |
Nicholas Bellinger | f6970ad | 2012-11-07 20:08:38 -0800 | [diff] [blame] | 143 | /* |
| 144 | * Enable write same emulation for IBLOCK and use 0xFFFF as |
| 145 | * the smaller WRITE_SAME(10) only has a two-byte block count. |
| 146 | */ |
| 147 | dev->dev_attrib.max_write_same_len = 0xFFFF; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 148 | |
Roland Dreier | e22a7f0 | 2011-07-05 13:34:52 -0700 | [diff] [blame] | 149 | if (blk_queue_nonrot(q)) |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 150 | dev->dev_attrib.is_nonrot = 1; |
Nicholas Bellinger | d0c8b25 | 2013-01-29 22:10:06 -0800 | [diff] [blame] | 151 | |
Nicholas Bellinger | ecebbf6 | 2013-12-23 20:31:24 +0000 | [diff] [blame] | 152 | bi = bdev_get_integrity(bd); |
| 153 | if (bi) { |
| 154 | struct bio_set *bs = ib_dev->ibd_bio_set; |
| 155 | |
| 156 | if (!strcmp(bi->name, "T10-DIF-TYPE3-IP") || |
| 157 | !strcmp(bi->name, "T10-DIF-TYPE1-IP")) { |
| 158 | pr_err("IBLOCK export of blk_integrity: %s not" |
| 159 | " supported\n", bi->name); |
| 160 | ret = -ENOSYS; |
| 161 | goto out_blkdev_put; |
| 162 | } |
| 163 | |
| 164 | if (!strcmp(bi->name, "T10-DIF-TYPE3-CRC")) { |
| 165 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT; |
| 166 | } else if (!strcmp(bi->name, "T10-DIF-TYPE1-CRC")) { |
| 167 | dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT; |
| 168 | } |
| 169 | |
| 170 | if (dev->dev_attrib.pi_prot_type) { |
| 171 | if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) { |
| 172 | pr_err("Unable to allocate bioset for PI\n"); |
| 173 | ret = -ENOMEM; |
| 174 | goto out_blkdev_put; |
| 175 | } |
| 176 | pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n", |
| 177 | bs->bio_integrity_pool); |
| 178 | } |
| 179 | dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type; |
| 180 | } |
| 181 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 182 | return 0; |
Roland Dreier | e22a7f0 | 2011-07-05 13:34:52 -0700 | [diff] [blame] | 183 | |
Nicholas Bellinger | ecebbf6 | 2013-12-23 20:31:24 +0000 | [diff] [blame] | 184 | out_blkdev_put: |
| 185 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 186 | out_free_bioset: |
| 187 | bioset_free(ib_dev->ibd_bio_set); |
| 188 | ib_dev->ibd_bio_set = NULL; |
| 189 | out: |
| 190 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 191 | } |
| 192 | |
Nicholas Bellinger | 4cc987e | 2015-05-19 00:03:07 -0700 | [diff] [blame] | 193 | static void iblock_dev_call_rcu(struct rcu_head *p) |
| 194 | { |
| 195 | struct se_device *dev = container_of(p, struct se_device, rcu_head); |
| 196 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| 197 | |
| 198 | kfree(ib_dev); |
| 199 | } |
| 200 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 201 | static void iblock_free_device(struct se_device *dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 202 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 203 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 204 | |
Nicholas Bellinger | bc66552 | 2011-02-09 15:34:38 -0800 | [diff] [blame] | 205 | if (ib_dev->ibd_bd != NULL) |
| 206 | blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); |
Nicholas Bellinger | d84287b | 2014-04-03 03:35:02 +0000 | [diff] [blame] | 207 | if (ib_dev->ibd_bio_set != NULL) |
Nicholas Bellinger | bc66552 | 2011-02-09 15:34:38 -0800 | [diff] [blame] | 208 | bioset_free(ib_dev->ibd_bio_set); |
Nicholas Bellinger | d84287b | 2014-04-03 03:35:02 +0000 | [diff] [blame] | 209 | |
Nicholas Bellinger | 4cc987e | 2015-05-19 00:03:07 -0700 | [diff] [blame] | 210 | call_rcu(&dev->rcu_head, iblock_dev_call_rcu); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 211 | } |
| 212 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 213 | static unsigned long long iblock_emulate_read_cap_with_block_size( |
| 214 | struct se_device *dev, |
| 215 | struct block_device *bd, |
| 216 | struct request_queue *q) |
| 217 | { |
| 218 | unsigned long long blocks_long = (div_u64(i_size_read(bd->bd_inode), |
| 219 | bdev_logical_block_size(bd)) - 1); |
| 220 | u32 block_size = bdev_logical_block_size(bd); |
| 221 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 222 | if (block_size == dev->dev_attrib.block_size) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 223 | return blocks_long; |
| 224 | |
| 225 | switch (block_size) { |
| 226 | case 4096: |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 227 | switch (dev->dev_attrib.block_size) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 228 | case 2048: |
| 229 | blocks_long <<= 1; |
| 230 | break; |
| 231 | case 1024: |
| 232 | blocks_long <<= 2; |
| 233 | break; |
| 234 | case 512: |
| 235 | blocks_long <<= 3; |
| 236 | default: |
| 237 | break; |
| 238 | } |
| 239 | break; |
| 240 | case 2048: |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 241 | switch (dev->dev_attrib.block_size) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 242 | case 4096: |
| 243 | blocks_long >>= 1; |
| 244 | break; |
| 245 | case 1024: |
| 246 | blocks_long <<= 1; |
| 247 | break; |
| 248 | case 512: |
| 249 | blocks_long <<= 2; |
| 250 | break; |
| 251 | default: |
| 252 | break; |
| 253 | } |
| 254 | break; |
| 255 | case 1024: |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 256 | switch (dev->dev_attrib.block_size) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 257 | case 4096: |
| 258 | blocks_long >>= 2; |
| 259 | break; |
| 260 | case 2048: |
| 261 | blocks_long >>= 1; |
| 262 | break; |
| 263 | case 512: |
| 264 | blocks_long <<= 1; |
| 265 | break; |
| 266 | default: |
| 267 | break; |
| 268 | } |
| 269 | break; |
| 270 | case 512: |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 271 | switch (dev->dev_attrib.block_size) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 272 | case 4096: |
| 273 | blocks_long >>= 3; |
| 274 | break; |
| 275 | case 2048: |
| 276 | blocks_long >>= 2; |
| 277 | break; |
| 278 | case 1024: |
| 279 | blocks_long >>= 1; |
| 280 | break; |
| 281 | default: |
| 282 | break; |
| 283 | } |
| 284 | break; |
| 285 | default: |
| 286 | break; |
| 287 | } |
| 288 | |
| 289 | return blocks_long; |
| 290 | } |
| 291 | |
Nicholas Bellinger | 3a41d85 | 2012-11-17 14:27:55 -0800 | [diff] [blame] | 292 | static void iblock_complete_cmd(struct se_cmd *cmd) |
| 293 | { |
| 294 | struct iblock_req *ibr = cmd->priv; |
| 295 | u8 status; |
| 296 | |
| 297 | if (!atomic_dec_and_test(&ibr->pending)) |
| 298 | return; |
| 299 | |
| 300 | if (atomic_read(&ibr->ib_bio_err_cnt)) |
| 301 | status = SAM_STAT_CHECK_CONDITION; |
| 302 | else |
| 303 | status = SAM_STAT_GOOD; |
| 304 | |
| 305 | target_complete_cmd(cmd, status); |
| 306 | kfree(ibr); |
| 307 | } |
| 308 | |
| 309 | static void iblock_bio_done(struct bio *bio, int err) |
| 310 | { |
| 311 | struct se_cmd *cmd = bio->bi_private; |
| 312 | struct iblock_req *ibr = cmd->priv; |
| 313 | |
| 314 | /* |
| 315 | * Set -EIO if !BIO_UPTODATE and the passed is still err=0 |
| 316 | */ |
| 317 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err) |
| 318 | err = -EIO; |
| 319 | |
| 320 | if (err != 0) { |
| 321 | pr_err("test_bit(BIO_UPTODATE) failed for bio: %p," |
| 322 | " err: %d\n", bio, err); |
| 323 | /* |
| 324 | * Bump the ib_bio_err_cnt and release bio. |
| 325 | */ |
| 326 | atomic_inc(&ibr->ib_bio_err_cnt); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 327 | smp_mb__after_atomic(); |
Nicholas Bellinger | 3a41d85 | 2012-11-17 14:27:55 -0800 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | bio_put(bio); |
| 331 | |
| 332 | iblock_complete_cmd(cmd); |
| 333 | } |
| 334 | |
| 335 | static struct bio * |
| 336 | iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num) |
| 337 | { |
| 338 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
| 339 | struct bio *bio; |
| 340 | |
| 341 | /* |
| 342 | * Only allocate as many vector entries as the bio code allows us to, |
| 343 | * we'll loop later on until we have handled the whole request. |
| 344 | */ |
| 345 | if (sg_num > BIO_MAX_PAGES) |
| 346 | sg_num = BIO_MAX_PAGES; |
| 347 | |
| 348 | bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set); |
| 349 | if (!bio) { |
| 350 | pr_err("Unable to allocate memory for bio\n"); |
| 351 | return NULL; |
| 352 | } |
| 353 | |
| 354 | bio->bi_bdev = ib_dev->ibd_bd; |
| 355 | bio->bi_private = cmd; |
| 356 | bio->bi_end_io = &iblock_bio_done; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 357 | bio->bi_iter.bi_sector = lba; |
Nicholas Bellinger | 3a41d85 | 2012-11-17 14:27:55 -0800 | [diff] [blame] | 358 | |
| 359 | return bio; |
| 360 | } |
| 361 | |
| 362 | static void iblock_submit_bios(struct bio_list *list, int rw) |
| 363 | { |
| 364 | struct blk_plug plug; |
| 365 | struct bio *bio; |
| 366 | |
| 367 | blk_start_plug(&plug); |
| 368 | while ((bio = bio_list_pop(list))) |
| 369 | submit_bio(rw, bio); |
| 370 | blk_finish_plug(&plug); |
| 371 | } |
| 372 | |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 373 | static void iblock_end_io_flush(struct bio *bio, int err) |
| 374 | { |
| 375 | struct se_cmd *cmd = bio->bi_private; |
| 376 | |
| 377 | if (err) |
| 378 | pr_err("IBLOCK: cache flush failed: %d\n", err); |
| 379 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 380 | if (cmd) { |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 381 | if (err) |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 382 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 383 | else |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 384 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 385 | } |
| 386 | |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 387 | bio_put(bio); |
| 388 | } |
| 389 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 390 | /* |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 391 | * Implement SYCHRONIZE CACHE. Note that we can't handle lba ranges and must |
| 392 | * always flush the whole cache. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 393 | */ |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 394 | static sense_reason_t |
| 395 | iblock_execute_sync_cache(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 396 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 397 | struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev); |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 398 | int immed = (cmd->t_task_cdb[1] & 0x2); |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 399 | struct bio *bio; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 400 | |
| 401 | /* |
| 402 | * If the Immediate bit is set, queue up the GOOD response |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 403 | * for this SYNCHRONIZE_CACHE op. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 404 | */ |
| 405 | if (immed) |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 406 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 407 | |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 408 | bio = bio_alloc(GFP_KERNEL, 0); |
| 409 | bio->bi_end_io = iblock_end_io_flush; |
| 410 | bio->bi_bdev = ib_dev->ibd_bd; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 411 | if (!immed) |
Christoph Hellwig | df5fa69 | 2011-10-14 07:29:58 -0400 | [diff] [blame] | 412 | bio->bi_private = cmd; |
| 413 | submit_bio(WRITE_FLUSH, bio); |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 414 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 415 | } |
| 416 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 417 | static sense_reason_t |
Christoph Hellwig | 62e4694 | 2015-06-19 15:10:59 +0200 | [diff] [blame] | 418 | iblock_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) |
Asias He | dbc21c5 | 2013-02-25 14:03:45 +0800 | [diff] [blame] | 419 | { |
Christoph Hellwig | 62e4694 | 2015-06-19 15:10:59 +0200 | [diff] [blame] | 420 | struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd; |
Asias He | dbc21c5 | 2013-02-25 14:03:45 +0800 | [diff] [blame] | 421 | int ret; |
| 422 | |
| 423 | ret = blkdev_issue_discard(bdev, lba, nolb, GFP_KERNEL, 0); |
| 424 | if (ret < 0) { |
| 425 | pr_err("blkdev_issue_discard() failed: %d\n", ret); |
| 426 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 427 | } |
| 428 | |
| 429 | return 0; |
| 430 | } |
| 431 | |
| 432 | static sense_reason_t |
Nicholas Bellinger | f6970ad | 2012-11-07 20:08:38 -0800 | [diff] [blame] | 433 | iblock_execute_write_same(struct se_cmd *cmd) |
| 434 | { |
| 435 | struct iblock_req *ibr; |
| 436 | struct scatterlist *sg; |
| 437 | struct bio *bio; |
| 438 | struct bio_list list; |
| 439 | sector_t block_lba = cmd->t_task_lba; |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 440 | sector_t sectors = sbc_get_write_same_sectors(cmd); |
Nicholas Bellinger | f6970ad | 2012-11-07 20:08:38 -0800 | [diff] [blame] | 441 | |
Nicholas Bellinger | afd73f1 | 2015-02-14 01:32:11 +0000 | [diff] [blame] | 442 | if (cmd->prot_op) { |
| 443 | pr_err("WRITE_SAME: Protection information with IBLOCK" |
| 444 | " backends not supported\n"); |
| 445 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 446 | } |
Nicholas Bellinger | f6970ad | 2012-11-07 20:08:38 -0800 | [diff] [blame] | 447 | sg = &cmd->t_data_sg[0]; |
| 448 | |
| 449 | if (cmd->t_data_nents > 1 || |
| 450 | sg->length != cmd->se_dev->dev_attrib.block_size) { |
| 451 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" |
| 452 | " block_size: %u\n", cmd->t_data_nents, sg->length, |
| 453 | cmd->se_dev->dev_attrib.block_size); |
| 454 | return TCM_INVALID_CDB_FIELD; |
| 455 | } |
| 456 | |
| 457 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
| 458 | if (!ibr) |
| 459 | goto fail; |
| 460 | cmd->priv = ibr; |
| 461 | |
| 462 | bio = iblock_get_bio(cmd, block_lba, 1); |
| 463 | if (!bio) |
| 464 | goto fail_free_ibr; |
| 465 | |
| 466 | bio_list_init(&list); |
| 467 | bio_list_add(&list, bio); |
| 468 | |
| 469 | atomic_set(&ibr->pending, 1); |
| 470 | |
| 471 | while (sectors) { |
| 472 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) |
| 473 | != sg->length) { |
| 474 | |
| 475 | bio = iblock_get_bio(cmd, block_lba, 1); |
| 476 | if (!bio) |
| 477 | goto fail_put_bios; |
| 478 | |
| 479 | atomic_inc(&ibr->pending); |
| 480 | bio_list_add(&list, bio); |
| 481 | } |
| 482 | |
| 483 | /* Always in 512 byte units for Linux/Block */ |
| 484 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; |
| 485 | sectors -= 1; |
| 486 | } |
| 487 | |
| 488 | iblock_submit_bios(&list, WRITE); |
| 489 | return 0; |
| 490 | |
| 491 | fail_put_bios: |
| 492 | while ((bio = bio_list_pop(&list))) |
| 493 | bio_put(bio); |
| 494 | fail_free_ibr: |
| 495 | kfree(ibr); |
| 496 | fail: |
| 497 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 498 | } |
| 499 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 500 | enum { |
Andy Grover | 44bfd01 | 2012-06-07 10:38:51 -0700 | [diff] [blame] | 501 | Opt_udev_path, Opt_readonly, Opt_force, Opt_err |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 502 | }; |
| 503 | |
| 504 | static match_table_t tokens = { |
| 505 | {Opt_udev_path, "udev_path=%s"}, |
Andy Grover | 44bfd01 | 2012-06-07 10:38:51 -0700 | [diff] [blame] | 506 | {Opt_readonly, "readonly=%d"}, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 507 | {Opt_force, "force=%d"}, |
| 508 | {Opt_err, NULL} |
| 509 | }; |
| 510 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 511 | static ssize_t iblock_set_configfs_dev_params(struct se_device *dev, |
| 512 | const char *page, ssize_t count) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 513 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 514 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 515 | char *orig, *ptr, *arg_p, *opts; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 516 | substring_t args[MAX_OPT_ARGS]; |
Roland Dreier | 21bca31 | 2011-07-05 15:35:02 -0700 | [diff] [blame] | 517 | int ret = 0, token; |
Andy Grover | 44bfd01 | 2012-06-07 10:38:51 -0700 | [diff] [blame] | 518 | unsigned long tmp_readonly; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 519 | |
| 520 | opts = kstrdup(page, GFP_KERNEL); |
| 521 | if (!opts) |
| 522 | return -ENOMEM; |
| 523 | |
| 524 | orig = opts; |
| 525 | |
Sebastian Andrzej Siewior | 90c161b | 2011-11-23 20:53:17 +0100 | [diff] [blame] | 526 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 527 | if (!*ptr) |
| 528 | continue; |
| 529 | |
| 530 | token = match_token(ptr, tokens, args); |
| 531 | switch (token) { |
| 532 | case Opt_udev_path: |
| 533 | if (ib_dev->ibd_bd) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 534 | pr_err("Unable to set udev_path= while" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 535 | " ib_dev->ibd_bd exists\n"); |
| 536 | ret = -EEXIST; |
| 537 | goto out; |
| 538 | } |
Nicholas Bellinger | 852b6ed | 2012-08-22 18:45:11 -0700 | [diff] [blame] | 539 | if (match_strlcpy(ib_dev->ibd_udev_path, &args[0], |
| 540 | SE_UDEV_PATH_LEN) == 0) { |
| 541 | ret = -EINVAL; |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 542 | break; |
| 543 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 544 | pr_debug("IBLOCK: Referencing UDEV path: %s\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 545 | ib_dev->ibd_udev_path); |
| 546 | ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH; |
| 547 | break; |
Andy Grover | 44bfd01 | 2012-06-07 10:38:51 -0700 | [diff] [blame] | 548 | case Opt_readonly: |
| 549 | arg_p = match_strdup(&args[0]); |
| 550 | if (!arg_p) { |
| 551 | ret = -ENOMEM; |
| 552 | break; |
| 553 | } |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 554 | ret = kstrtoul(arg_p, 0, &tmp_readonly); |
Andy Grover | 44bfd01 | 2012-06-07 10:38:51 -0700 | [diff] [blame] | 555 | kfree(arg_p); |
| 556 | if (ret < 0) { |
Jingoo Han | 57103d7 | 2013-07-19 16:22:19 +0900 | [diff] [blame] | 557 | pr_err("kstrtoul() failed for" |
Andy Grover | 44bfd01 | 2012-06-07 10:38:51 -0700 | [diff] [blame] | 558 | " readonly=\n"); |
| 559 | goto out; |
| 560 | } |
| 561 | ib_dev->ibd_readonly = tmp_readonly; |
| 562 | pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly); |
| 563 | break; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 564 | case Opt_force: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 565 | break; |
| 566 | default: |
| 567 | break; |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | out: |
| 572 | kfree(orig); |
| 573 | return (!ret) ? count : ret; |
| 574 | } |
| 575 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 576 | static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 577 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 578 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| 579 | struct block_device *bd = ib_dev->ibd_bd; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 580 | char buf[BDEVNAME_SIZE]; |
| 581 | ssize_t bl = 0; |
| 582 | |
| 583 | if (bd) |
| 584 | bl += sprintf(b + bl, "iBlock device: %s", |
| 585 | bdevname(bd, buf)); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 586 | if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH) |
Andy Grover | 44bfd01 | 2012-06-07 10:38:51 -0700 | [diff] [blame] | 587 | bl += sprintf(b + bl, " UDEV PATH: %s", |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 588 | ib_dev->ibd_udev_path); |
| 589 | bl += sprintf(b + bl, " readonly: %d\n", ib_dev->ibd_readonly); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 590 | |
| 591 | bl += sprintf(b + bl, " "); |
| 592 | if (bd) { |
| 593 | bl += sprintf(b + bl, "Major: %d Minor: %d %s\n", |
Roland Dreier | 21bca31 | 2011-07-05 15:35:02 -0700 | [diff] [blame] | 594 | MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ? |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 595 | "" : (bd->bd_holder == ib_dev) ? |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 596 | "CLAIMED: IBLOCK" : "CLAIMED: OS"); |
| 597 | } else { |
Roland Dreier | 21bca31 | 2011-07-05 15:35:02 -0700 | [diff] [blame] | 598 | bl += sprintf(b + bl, "Major: 0 Minor: 0\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 599 | } |
| 600 | |
| 601 | return bl; |
| 602 | } |
| 603 | |
Nicholas Bellinger | ecebbf6 | 2013-12-23 20:31:24 +0000 | [diff] [blame] | 604 | static int |
| 605 | iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio) |
| 606 | { |
| 607 | struct se_device *dev = cmd->se_dev; |
| 608 | struct blk_integrity *bi; |
| 609 | struct bio_integrity_payload *bip; |
| 610 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| 611 | struct scatterlist *sg; |
| 612 | int i, rc; |
| 613 | |
| 614 | bi = bdev_get_integrity(ib_dev->ibd_bd); |
| 615 | if (!bi) { |
| 616 | pr_err("Unable to locate bio_integrity\n"); |
| 617 | return -ENODEV; |
| 618 | } |
| 619 | |
| 620 | bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents); |
| 621 | if (!bip) { |
| 622 | pr_err("Unable to allocate bio_integrity_payload\n"); |
| 623 | return -ENOMEM; |
| 624 | } |
| 625 | |
Linus Torvalds | 4e13c5d | 2014-01-31 15:31:23 -0800 | [diff] [blame] | 626 | bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) * |
Nicholas Bellinger | ecebbf6 | 2013-12-23 20:31:24 +0000 | [diff] [blame] | 627 | dev->prot_length; |
Linus Torvalds | 4e13c5d | 2014-01-31 15:31:23 -0800 | [diff] [blame] | 628 | bip->bip_iter.bi_sector = bio->bi_iter.bi_sector; |
Nicholas Bellinger | ecebbf6 | 2013-12-23 20:31:24 +0000 | [diff] [blame] | 629 | |
Linus Torvalds | 4e13c5d | 2014-01-31 15:31:23 -0800 | [diff] [blame] | 630 | pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size, |
| 631 | (unsigned long long)bip->bip_iter.bi_sector); |
Nicholas Bellinger | ecebbf6 | 2013-12-23 20:31:24 +0000 | [diff] [blame] | 632 | |
| 633 | for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) { |
| 634 | |
| 635 | rc = bio_integrity_add_page(bio, sg_page(sg), sg->length, |
| 636 | sg->offset); |
| 637 | if (rc != sg->length) { |
| 638 | pr_err("bio_integrity_add_page() failed; %d\n", rc); |
| 639 | return -ENOMEM; |
| 640 | } |
| 641 | |
| 642 | pr_debug("Added bio integrity page: %p length: %d offset; %d\n", |
| 643 | sg_page(sg), sg->length, sg->offset); |
| 644 | } |
| 645 | |
| 646 | return 0; |
| 647 | } |
| 648 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 649 | static sense_reason_t |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 650 | iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
| 651 | enum dma_data_direction data_direction) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 652 | { |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 653 | struct se_device *dev = cmd->se_dev; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 654 | struct iblock_req *ibr; |
Nicholas Bellinger | ecebbf6 | 2013-12-23 20:31:24 +0000 | [diff] [blame] | 655 | struct bio *bio, *bio_start; |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 656 | struct bio_list list; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 657 | struct scatterlist *sg; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 658 | u32 sg_num = sgl_nents; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 659 | sector_t block_lba; |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 660 | unsigned bio_cnt; |
Nicholas Bellinger | d0c8b25 | 2013-01-29 22:10:06 -0800 | [diff] [blame] | 661 | int rw = 0; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 662 | int i; |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 663 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 664 | if (data_direction == DMA_TO_DEVICE) { |
Nicholas Bellinger | d0c8b25 | 2013-01-29 22:10:06 -0800 | [diff] [blame] | 665 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| 666 | struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd); |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 667 | /* |
Nicholas Bellinger | d0c8b25 | 2013-01-29 22:10:06 -0800 | [diff] [blame] | 668 | * Force writethrough using WRITE_FUA if a volatile write cache |
| 669 | * is not enabled, or if initiator set the Force Unit Access bit. |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 670 | */ |
Nicholas Bellinger | d0c8b25 | 2013-01-29 22:10:06 -0800 | [diff] [blame] | 671 | if (q->flush_flags & REQ_FUA) { |
| 672 | if (cmd->se_cmd_flags & SCF_FUA) |
| 673 | rw = WRITE_FUA; |
| 674 | else if (!(q->flush_flags & REQ_FLUSH)) |
| 675 | rw = WRITE_FUA; |
Nicholas Bellinger | d2bdbee | 2013-05-14 23:41:04 -0700 | [diff] [blame] | 676 | else |
| 677 | rw = WRITE; |
Nicholas Bellinger | d0c8b25 | 2013-01-29 22:10:06 -0800 | [diff] [blame] | 678 | } else { |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 679 | rw = WRITE; |
Nicholas Bellinger | d0c8b25 | 2013-01-29 22:10:06 -0800 | [diff] [blame] | 680 | } |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 681 | } else { |
| 682 | rw = READ; |
| 683 | } |
| 684 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 685 | /* |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 686 | * Convert the blocksize advertised to the initiator to the 512 byte |
| 687 | * units unconditionally used by the Linux block layer. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 688 | */ |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 689 | if (dev->dev_attrib.block_size == 4096) |
Christoph Hellwig | 72a0e5e | 2012-04-23 11:35:30 -0400 | [diff] [blame] | 690 | block_lba = (cmd->t_task_lba << 3); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 691 | else if (dev->dev_attrib.block_size == 2048) |
Christoph Hellwig | 72a0e5e | 2012-04-23 11:35:30 -0400 | [diff] [blame] | 692 | block_lba = (cmd->t_task_lba << 2); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 693 | else if (dev->dev_attrib.block_size == 1024) |
Christoph Hellwig | 72a0e5e | 2012-04-23 11:35:30 -0400 | [diff] [blame] | 694 | block_lba = (cmd->t_task_lba << 1); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 695 | else if (dev->dev_attrib.block_size == 512) |
Christoph Hellwig | 72a0e5e | 2012-04-23 11:35:30 -0400 | [diff] [blame] | 696 | block_lba = cmd->t_task_lba; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 697 | else { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 698 | pr_err("Unsupported SCSI -> BLOCK LBA conversion:" |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 699 | " %u\n", dev->dev_attrib.block_size); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 700 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 701 | } |
| 702 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 703 | ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL); |
| 704 | if (!ibr) |
| 705 | goto fail; |
| 706 | cmd->priv = ibr; |
| 707 | |
Paolo Bonzini | e0de445 | 2012-09-07 17:30:41 +0200 | [diff] [blame] | 708 | if (!sgl_nents) { |
| 709 | atomic_set(&ibr->pending, 1); |
| 710 | iblock_complete_cmd(cmd); |
| 711 | return 0; |
| 712 | } |
| 713 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 714 | bio = iblock_get_bio(cmd, block_lba, sgl_nents); |
| 715 | if (!bio) |
| 716 | goto fail_free_ibr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 717 | |
Nicholas Bellinger | ecebbf6 | 2013-12-23 20:31:24 +0000 | [diff] [blame] | 718 | bio_start = bio; |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 719 | bio_list_init(&list); |
| 720 | bio_list_add(&list, bio); |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 721 | |
| 722 | atomic_set(&ibr->pending, 2); |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 723 | bio_cnt = 1; |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 724 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 725 | for_each_sg(sgl, sg, sgl_nents, i) { |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 726 | /* |
| 727 | * XXX: if the length the device accepts is shorter than the |
| 728 | * length of the S/G list entry this will cause and |
| 729 | * endless loop. Better hope no driver uses huge pages. |
| 730 | */ |
| 731 | while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset) |
| 732 | != sg->length) { |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 733 | if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) { |
| 734 | iblock_submit_bios(&list, rw); |
| 735 | bio_cnt = 0; |
| 736 | } |
| 737 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 738 | bio = iblock_get_bio(cmd, block_lba, sg_num); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 739 | if (!bio) |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 740 | goto fail_put_bios; |
| 741 | |
| 742 | atomic_inc(&ibr->pending); |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 743 | bio_list_add(&list, bio); |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 744 | bio_cnt++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 745 | } |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 746 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 747 | /* Always in 512 byte units for Linux/Block */ |
| 748 | block_lba += sg->length >> IBLOCK_LBA_SHIFT; |
| 749 | sg_num--; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 750 | } |
| 751 | |
Nicholas Bellinger | 6f16ec4 | 2015-03-27 23:14:16 -0700 | [diff] [blame] | 752 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
Nicholas Bellinger | ecebbf6 | 2013-12-23 20:31:24 +0000 | [diff] [blame] | 753 | int rc = iblock_alloc_bip(cmd, bio_start); |
| 754 | if (rc) |
| 755 | goto fail_put_bios; |
| 756 | } |
| 757 | |
Christoph Hellwig | d5b4a21 | 2011-12-21 14:20:31 -0500 | [diff] [blame] | 758 | iblock_submit_bios(&list, rw); |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 759 | iblock_complete_cmd(cmd); |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 760 | return 0; |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 761 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 762 | fail_put_bios: |
Christoph Hellwig | dbbf3e9 | 2011-09-25 14:56:24 -0400 | [diff] [blame] | 763 | while ((bio = bio_list_pop(&list))) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 764 | bio_put(bio); |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 765 | fail_free_ibr: |
| 766 | kfree(ibr); |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 767 | fail: |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 768 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 769 | } |
| 770 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 771 | static sector_t iblock_get_blocks(struct se_device *dev) |
| 772 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 773 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| 774 | struct block_device *bd = ib_dev->ibd_bd; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 775 | struct request_queue *q = bdev_get_queue(bd); |
| 776 | |
| 777 | return iblock_emulate_read_cap_with_block_size(dev, bd, q); |
| 778 | } |
| 779 | |
Andy Grover | 7f7caf6 | 2013-11-11 08:59:17 -0800 | [diff] [blame] | 780 | static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev) |
| 781 | { |
| 782 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| 783 | struct block_device *bd = ib_dev->ibd_bd; |
| 784 | int ret; |
| 785 | |
| 786 | ret = bdev_alignment_offset(bd); |
| 787 | if (ret == -1) |
| 788 | return 0; |
| 789 | |
| 790 | /* convert offset-bytes to offset-lbas */ |
| 791 | return ret / bdev_logical_block_size(bd); |
| 792 | } |
| 793 | |
| 794 | static unsigned int iblock_get_lbppbe(struct se_device *dev) |
| 795 | { |
| 796 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| 797 | struct block_device *bd = ib_dev->ibd_bd; |
| 798 | int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd); |
| 799 | |
| 800 | return ilog2(logs_per_phys); |
| 801 | } |
| 802 | |
| 803 | static unsigned int iblock_get_io_min(struct se_device *dev) |
| 804 | { |
| 805 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| 806 | struct block_device *bd = ib_dev->ibd_bd; |
| 807 | |
| 808 | return bdev_io_min(bd); |
| 809 | } |
| 810 | |
| 811 | static unsigned int iblock_get_io_opt(struct se_device *dev) |
| 812 | { |
| 813 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| 814 | struct block_device *bd = ib_dev->ibd_bd; |
| 815 | |
| 816 | return bdev_io_opt(bd); |
| 817 | } |
| 818 | |
Christoph Hellwig | 9e999a6 | 2012-10-07 10:55:50 -0400 | [diff] [blame] | 819 | static struct sbc_ops iblock_sbc_ops = { |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 820 | .execute_rw = iblock_execute_rw, |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 821 | .execute_sync_cache = iblock_execute_sync_cache, |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 822 | .execute_write_same = iblock_execute_write_same, |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 823 | .execute_unmap = iblock_execute_unmap, |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 824 | }; |
| 825 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 826 | static sense_reason_t |
| 827 | iblock_parse_cdb(struct se_cmd *cmd) |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 828 | { |
Christoph Hellwig | 9e999a6 | 2012-10-07 10:55:50 -0400 | [diff] [blame] | 829 | return sbc_parse_cdb(cmd, &iblock_sbc_ops); |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 830 | } |
| 831 | |
Rashika Kheria | 452e201 | 2013-12-18 23:56:44 +0530 | [diff] [blame] | 832 | static bool iblock_get_write_cache(struct se_device *dev) |
Nicholas Bellinger | d0c8b25 | 2013-01-29 22:10:06 -0800 | [diff] [blame] | 833 | { |
| 834 | struct iblock_dev *ib_dev = IBLOCK_DEV(dev); |
| 835 | struct block_device *bd = ib_dev->ibd_bd; |
| 836 | struct request_queue *q = bdev_get_queue(bd); |
| 837 | |
| 838 | return q->flush_flags & REQ_FLUSH; |
| 839 | } |
| 840 | |
Christoph Hellwig | 0a06d43 | 2015-05-10 18:14:56 +0200 | [diff] [blame] | 841 | static const struct target_backend_ops iblock_ops = { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 842 | .name = "iblock", |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 843 | .inquiry_prod = "IBLOCK", |
| 844 | .inquiry_rev = IBLOCK_VERSION, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 845 | .owner = THIS_MODULE, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 846 | .attach_hba = iblock_attach_hba, |
| 847 | .detach_hba = iblock_detach_hba, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 848 | .alloc_device = iblock_alloc_device, |
| 849 | .configure_device = iblock_configure_device, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 850 | .free_device = iblock_free_device, |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 851 | .parse_cdb = iblock_parse_cdb, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 852 | .set_configfs_dev_params = iblock_set_configfs_dev_params, |
| 853 | .show_configfs_dev_params = iblock_show_configfs_dev_params, |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 854 | .get_device_type = sbc_get_device_type, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 855 | .get_blocks = iblock_get_blocks, |
Andy Grover | 7f7caf6 | 2013-11-11 08:59:17 -0800 | [diff] [blame] | 856 | .get_alignment_offset_lbas = iblock_get_alignment_offset_lbas, |
| 857 | .get_lbppbe = iblock_get_lbppbe, |
| 858 | .get_io_min = iblock_get_io_min, |
| 859 | .get_io_opt = iblock_get_io_opt, |
Nicholas Bellinger | d0c8b25 | 2013-01-29 22:10:06 -0800 | [diff] [blame] | 860 | .get_write_cache = iblock_get_write_cache, |
Christoph Hellwig | 5873c4d | 2015-05-10 18:14:57 +0200 | [diff] [blame] | 861 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 862 | }; |
| 863 | |
| 864 | static int __init iblock_module_init(void) |
| 865 | { |
Christoph Hellwig | 0a06d43 | 2015-05-10 18:14:56 +0200 | [diff] [blame] | 866 | return transport_backend_register(&iblock_ops); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 867 | } |
| 868 | |
Asias He | 63b91d5 | 2013-02-27 12:50:56 +0800 | [diff] [blame] | 869 | static void __exit iblock_module_exit(void) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 870 | { |
Christoph Hellwig | 0a06d43 | 2015-05-10 18:14:56 +0200 | [diff] [blame] | 871 | target_backend_unregister(&iblock_ops); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 872 | } |
| 873 | |
| 874 | MODULE_DESCRIPTION("TCM IBLOCK subsystem plugin"); |
| 875 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); |
| 876 | MODULE_LICENSE("GPL"); |
| 877 | |
| 878 | module_init(iblock_module_init); |
| 879 | module_exit(iblock_module_exit); |