Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * Filename: target_core_file.c |
| 3 | * |
| 4 | * This file contains the Storage Engine <-> FILEIO transport specific functions |
| 5 | * |
| 6 | * Copyright (c) 2005 PyX Technologies, Inc. |
| 7 | * Copyright (c) 2005-2006 SBE, Inc. All Rights Reserved. |
| 8 | * Copyright (c) 2007-2010 Rising Tide Systems |
| 9 | * Copyright (c) 2008-2010 Linux-iSCSI.org |
| 10 | * |
| 11 | * Nicholas A. Bellinger <nab@kernel.org> |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or |
| 16 | * (at your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License |
| 24 | * along with this program; if not, write to the Free Software |
| 25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 26 | * |
| 27 | ******************************************************************************/ |
| 28 | |
| 29 | #include <linux/version.h> |
| 30 | #include <linux/string.h> |
| 31 | #include <linux/parser.h> |
| 32 | #include <linux/timer.h> |
| 33 | #include <linux/blkdev.h> |
| 34 | #include <linux/slab.h> |
| 35 | #include <linux/spinlock.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 36 | #include <scsi/scsi.h> |
| 37 | #include <scsi/scsi_host.h> |
| 38 | |
| 39 | #include <target/target_core_base.h> |
| 40 | #include <target/target_core_device.h> |
| 41 | #include <target/target_core_transport.h> |
| 42 | |
| 43 | #include "target_core_file.h" |
| 44 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 45 | static struct se_subsystem_api fileio_template; |
| 46 | |
| 47 | /* fd_attach_hba(): (Part of se_subsystem_api_t template) |
| 48 | * |
| 49 | * |
| 50 | */ |
| 51 | static int fd_attach_hba(struct se_hba *hba, u32 host_id) |
| 52 | { |
| 53 | struct fd_host *fd_host; |
| 54 | |
| 55 | fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 56 | if (!fd_host) { |
| 57 | pr_err("Unable to allocate memory for struct fd_host\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 58 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | fd_host->fd_host_id = host_id; |
| 62 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 63 | hba->hba_ptr = fd_host; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 64 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 65 | pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 66 | " Target Core Stack %s\n", hba->hba_id, FD_VERSION, |
| 67 | TARGET_CORE_MOD_VERSION); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 68 | pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 69 | " MaxSectors: %u\n", |
| 70 | hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 71 | |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static void fd_detach_hba(struct se_hba *hba) |
| 76 | { |
| 77 | struct fd_host *fd_host = hba->hba_ptr; |
| 78 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 79 | pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 80 | " Target Core\n", hba->hba_id, fd_host->fd_host_id); |
| 81 | |
| 82 | kfree(fd_host); |
| 83 | hba->hba_ptr = NULL; |
| 84 | } |
| 85 | |
| 86 | static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name) |
| 87 | { |
| 88 | struct fd_dev *fd_dev; |
| 89 | struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr; |
| 90 | |
| 91 | fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 92 | if (!fd_dev) { |
| 93 | pr_err("Unable to allocate memory for struct fd_dev\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 94 | return NULL; |
| 95 | } |
| 96 | |
| 97 | fd_dev->fd_host = fd_host; |
| 98 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 99 | pr_debug("FILEIO: Allocated fd_dev for %p\n", name); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 100 | |
| 101 | return fd_dev; |
| 102 | } |
| 103 | |
| 104 | /* fd_create_virtdevice(): (Part of se_subsystem_api_t template) |
| 105 | * |
| 106 | * |
| 107 | */ |
| 108 | static struct se_device *fd_create_virtdevice( |
| 109 | struct se_hba *hba, |
| 110 | struct se_subsystem_dev *se_dev, |
| 111 | void *p) |
| 112 | { |
| 113 | char *dev_p = NULL; |
| 114 | struct se_device *dev; |
| 115 | struct se_dev_limits dev_limits; |
| 116 | struct queue_limits *limits; |
| 117 | struct fd_dev *fd_dev = (struct fd_dev *) p; |
| 118 | struct fd_host *fd_host = (struct fd_host *) hba->hba_ptr; |
| 119 | mm_segment_t old_fs; |
| 120 | struct file *file; |
| 121 | struct inode *inode = NULL; |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 122 | int dev_flags = 0, flags, ret = -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 123 | |
| 124 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); |
| 125 | |
| 126 | old_fs = get_fs(); |
| 127 | set_fs(get_ds()); |
| 128 | dev_p = getname(fd_dev->fd_dev_name); |
| 129 | set_fs(old_fs); |
| 130 | |
| 131 | if (IS_ERR(dev_p)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 132 | pr_err("getname(%s) failed: %lu\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 133 | fd_dev->fd_dev_name, IS_ERR(dev_p)); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 134 | ret = PTR_ERR(dev_p); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 135 | goto fail; |
| 136 | } |
| 137 | #if 0 |
| 138 | if (di->no_create_file) |
| 139 | flags = O_RDWR | O_LARGEFILE; |
| 140 | else |
| 141 | flags = O_RDWR | O_CREAT | O_LARGEFILE; |
| 142 | #else |
| 143 | flags = O_RDWR | O_CREAT | O_LARGEFILE; |
| 144 | #endif |
| 145 | /* flags |= O_DIRECT; */ |
| 146 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 147 | * If fd_buffered_io=1 has not been set explicitly (the default), |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 148 | * use O_SYNC to force FILEIO writes to disk. |
| 149 | */ |
| 150 | if (!(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO)) |
| 151 | flags |= O_SYNC; |
| 152 | |
| 153 | file = filp_open(dev_p, flags, 0600); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 154 | if (IS_ERR(file)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 155 | pr_err("filp_open(%s) failed\n", dev_p); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 156 | ret = PTR_ERR(file); |
| 157 | goto fail; |
| 158 | } |
| 159 | if (!file || !file->f_dentry) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 160 | pr_err("filp_open(%s) failed\n", dev_p); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 161 | goto fail; |
| 162 | } |
| 163 | fd_dev->fd_file = file; |
| 164 | /* |
| 165 | * If using a block backend with this struct file, we extract |
| 166 | * fd_dev->fd_[block,dev]_size from struct block_device. |
| 167 | * |
| 168 | * Otherwise, we use the passed fd_size= from configfs |
| 169 | */ |
| 170 | inode = file->f_mapping->host; |
| 171 | if (S_ISBLK(inode->i_mode)) { |
| 172 | struct request_queue *q; |
| 173 | /* |
| 174 | * Setup the local scope queue_limits from struct request_queue->limits |
| 175 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. |
| 176 | */ |
| 177 | q = bdev_get_queue(inode->i_bdev); |
| 178 | limits = &dev_limits.limits; |
| 179 | limits->logical_block_size = bdev_logical_block_size(inode->i_bdev); |
| 180 | limits->max_hw_sectors = queue_max_hw_sectors(q); |
| 181 | limits->max_sectors = queue_max_sectors(q); |
| 182 | /* |
| 183 | * Determine the number of bytes from i_size_read() minus |
| 184 | * one (1) logical sector from underlying struct block_device |
| 185 | */ |
| 186 | fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); |
| 187 | fd_dev->fd_dev_size = (i_size_read(file->f_mapping->host) - |
| 188 | fd_dev->fd_block_size); |
| 189 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 190 | pr_debug("FILEIO: Using size: %llu bytes from struct" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 191 | " block_device blocks: %llu logical_block_size: %d\n", |
| 192 | fd_dev->fd_dev_size, |
| 193 | div_u64(fd_dev->fd_dev_size, fd_dev->fd_block_size), |
| 194 | fd_dev->fd_block_size); |
| 195 | } else { |
| 196 | if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 197 | pr_err("FILEIO: Missing fd_dev_size=" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 198 | " parameter, and no backing struct" |
| 199 | " block_device\n"); |
| 200 | goto fail; |
| 201 | } |
| 202 | |
| 203 | limits = &dev_limits.limits; |
| 204 | limits->logical_block_size = FD_BLOCKSIZE; |
| 205 | limits->max_hw_sectors = FD_MAX_SECTORS; |
| 206 | limits->max_sectors = FD_MAX_SECTORS; |
| 207 | fd_dev->fd_block_size = FD_BLOCKSIZE; |
| 208 | } |
| 209 | |
| 210 | dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; |
| 211 | dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH; |
| 212 | |
| 213 | dev = transport_add_device_to_core_hba(hba, &fileio_template, |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 214 | se_dev, dev_flags, fd_dev, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 215 | &dev_limits, "FILEIO", FD_VERSION); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 216 | if (!dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 217 | goto fail; |
| 218 | |
| 219 | fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; |
| 220 | fd_dev->fd_queue_depth = dev->queue_depth; |
| 221 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 222 | pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 223 | " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, |
| 224 | fd_dev->fd_dev_name, fd_dev->fd_dev_size); |
| 225 | |
| 226 | putname(dev_p); |
| 227 | return dev; |
| 228 | fail: |
| 229 | if (fd_dev->fd_file) { |
| 230 | filp_close(fd_dev->fd_file, NULL); |
| 231 | fd_dev->fd_file = NULL; |
| 232 | } |
| 233 | putname(dev_p); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 234 | return ERR_PTR(ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 235 | } |
| 236 | |
| 237 | /* fd_free_device(): (Part of se_subsystem_api_t template) |
| 238 | * |
| 239 | * |
| 240 | */ |
| 241 | static void fd_free_device(void *p) |
| 242 | { |
| 243 | struct fd_dev *fd_dev = (struct fd_dev *) p; |
| 244 | |
| 245 | if (fd_dev->fd_file) { |
| 246 | filp_close(fd_dev->fd_file, NULL); |
| 247 | fd_dev->fd_file = NULL; |
| 248 | } |
| 249 | |
| 250 | kfree(fd_dev); |
| 251 | } |
| 252 | |
| 253 | static inline struct fd_request *FILE_REQ(struct se_task *task) |
| 254 | { |
| 255 | return container_of(task, struct fd_request, fd_task); |
| 256 | } |
| 257 | |
| 258 | |
| 259 | static struct se_task * |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 260 | fd_alloc_task(unsigned char *cdb) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 261 | { |
| 262 | struct fd_request *fd_req; |
| 263 | |
| 264 | fd_req = kzalloc(sizeof(struct fd_request), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 265 | if (!fd_req) { |
| 266 | pr_err("Unable to allocate struct fd_request\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 267 | return NULL; |
| 268 | } |
| 269 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 270 | return &fd_req->fd_task; |
| 271 | } |
| 272 | |
| 273 | static int fd_do_readv(struct se_task *task) |
| 274 | { |
| 275 | struct fd_request *req = FILE_REQ(task); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 276 | struct fd_dev *dev = req->fd_task.se_dev->dev_ptr; |
| 277 | struct file *fd = dev->fd_file; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 278 | struct scatterlist *sg = task->task_sg; |
| 279 | struct iovec *iov; |
| 280 | mm_segment_t old_fs; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 281 | loff_t pos = (task->task_lba * |
| 282 | task->se_dev->se_sub_dev->se_dev_attrib.block_size); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 283 | int ret = 0, i; |
| 284 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 285 | iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL); |
| 286 | if (!iov) { |
| 287 | pr_err("Unable to allocate fd_do_readv iov[]\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 288 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 289 | } |
| 290 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 291 | for (i = 0; i < task->task_sg_nents; i++) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 292 | iov[i].iov_len = sg[i].length; |
| 293 | iov[i].iov_base = sg_virt(&sg[i]); |
| 294 | } |
| 295 | |
| 296 | old_fs = get_fs(); |
| 297 | set_fs(get_ds()); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 298 | ret = vfs_readv(fd, &iov[0], task->task_sg_nents, &pos); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 299 | set_fs(old_fs); |
| 300 | |
| 301 | kfree(iov); |
| 302 | /* |
| 303 | * Return zeros and GOOD status even if the READ did not return |
| 304 | * the expected virt_size for struct file w/o a backing struct |
| 305 | * block_device. |
| 306 | */ |
| 307 | if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { |
| 308 | if (ret < 0 || ret != task->task_size) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 309 | pr_err("vfs_readv() returned %d," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 310 | " expecting %d for S_ISBLK\n", ret, |
| 311 | (int)task->task_size); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 312 | return (ret < 0 ? ret : -EINVAL); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 313 | } |
| 314 | } else { |
| 315 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 316 | pr_err("vfs_readv() returned %d for non" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 317 | " S_ISBLK\n", ret); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 318 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 319 | } |
| 320 | } |
| 321 | |
| 322 | return 1; |
| 323 | } |
| 324 | |
| 325 | static int fd_do_writev(struct se_task *task) |
| 326 | { |
| 327 | struct fd_request *req = FILE_REQ(task); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 328 | struct fd_dev *dev = req->fd_task.se_dev->dev_ptr; |
| 329 | struct file *fd = dev->fd_file; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 330 | struct scatterlist *sg = task->task_sg; |
| 331 | struct iovec *iov; |
| 332 | mm_segment_t old_fs; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 333 | loff_t pos = (task->task_lba * |
| 334 | task->se_dev->se_sub_dev->se_dev_attrib.block_size); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 335 | int ret, i = 0; |
| 336 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 337 | iov = kzalloc(sizeof(struct iovec) * task->task_sg_nents, GFP_KERNEL); |
| 338 | if (!iov) { |
| 339 | pr_err("Unable to allocate fd_do_writev iov[]\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 340 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 341 | } |
| 342 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 343 | for (i = 0; i < task->task_sg_nents; i++) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 344 | iov[i].iov_len = sg[i].length; |
| 345 | iov[i].iov_base = sg_virt(&sg[i]); |
| 346 | } |
| 347 | |
| 348 | old_fs = get_fs(); |
| 349 | set_fs(get_ds()); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 350 | ret = vfs_writev(fd, &iov[0], task->task_sg_nents, &pos); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 351 | set_fs(old_fs); |
| 352 | |
| 353 | kfree(iov); |
| 354 | |
| 355 | if (ret < 0 || ret != task->task_size) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 356 | pr_err("vfs_writev() returned %d\n", ret); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 357 | return (ret < 0 ? ret : -EINVAL); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | return 1; |
| 361 | } |
| 362 | |
| 363 | static void fd_emulate_sync_cache(struct se_task *task) |
| 364 | { |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 365 | struct se_cmd *cmd = task->task_se_cmd; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 366 | struct se_device *dev = cmd->se_dev; |
| 367 | struct fd_dev *fd_dev = dev->dev_ptr; |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 368 | int immed = (cmd->t_task_cdb[1] & 0x2); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 369 | loff_t start, end; |
| 370 | int ret; |
| 371 | |
| 372 | /* |
| 373 | * If the Immediate bit is set, queue up the GOOD response |
| 374 | * for this SYNCHRONIZE_CACHE op |
| 375 | */ |
| 376 | if (immed) |
| 377 | transport_complete_sync_cache(cmd, 1); |
| 378 | |
| 379 | /* |
| 380 | * Determine if we will be flushing the entire device. |
| 381 | */ |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 382 | if (cmd->t_task_lba == 0 && cmd->data_length == 0) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 383 | start = 0; |
| 384 | end = LLONG_MAX; |
| 385 | } else { |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 386 | start = cmd->t_task_lba * dev->se_sub_dev->se_dev_attrib.block_size; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 387 | if (cmd->data_length) |
| 388 | end = start + cmd->data_length; |
| 389 | else |
| 390 | end = LLONG_MAX; |
| 391 | } |
| 392 | |
| 393 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); |
| 394 | if (ret != 0) |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 395 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 396 | |
| 397 | if (!immed) |
| 398 | transport_complete_sync_cache(cmd, ret == 0); |
| 399 | } |
| 400 | |
| 401 | /* |
| 402 | * Tell TCM Core that we are capable of WriteCache emulation for |
| 403 | * an underlying struct se_device. |
| 404 | */ |
| 405 | static int fd_emulated_write_cache(struct se_device *dev) |
| 406 | { |
| 407 | return 1; |
| 408 | } |
| 409 | |
| 410 | static int fd_emulated_dpo(struct se_device *dev) |
| 411 | { |
| 412 | return 0; |
| 413 | } |
| 414 | /* |
| 415 | * Tell TCM Core that we will be emulating Forced Unit Access (FUA) for WRITEs |
| 416 | * for TYPE_DISK. |
| 417 | */ |
| 418 | static int fd_emulated_fua_write(struct se_device *dev) |
| 419 | { |
| 420 | return 1; |
| 421 | } |
| 422 | |
| 423 | static int fd_emulated_fua_read(struct se_device *dev) |
| 424 | { |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | /* |
| 429 | * WRITE Force Unit Access (FUA) emulation on a per struct se_task |
| 430 | * LBA range basis.. |
| 431 | */ |
| 432 | static void fd_emulate_write_fua(struct se_cmd *cmd, struct se_task *task) |
| 433 | { |
| 434 | struct se_device *dev = cmd->se_dev; |
| 435 | struct fd_dev *fd_dev = dev->dev_ptr; |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 436 | loff_t start = task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 437 | loff_t end = start + task->task_size; |
| 438 | int ret; |
| 439 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 440 | pr_debug("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 441 | task->task_lba, task->task_size); |
| 442 | |
| 443 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); |
| 444 | if (ret != 0) |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 445 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 446 | } |
| 447 | |
| 448 | static int fd_do_task(struct se_task *task) |
| 449 | { |
| 450 | struct se_cmd *cmd = task->task_se_cmd; |
| 451 | struct se_device *dev = cmd->se_dev; |
| 452 | int ret = 0; |
| 453 | |
| 454 | /* |
| 455 | * Call vectorized fileio functions to map struct scatterlist |
| 456 | * physical memory addresses to struct iovec virtual memory. |
| 457 | */ |
| 458 | if (task->task_data_direction == DMA_FROM_DEVICE) { |
| 459 | ret = fd_do_readv(task); |
| 460 | } else { |
| 461 | ret = fd_do_writev(task); |
| 462 | |
| 463 | if (ret > 0 && |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 464 | dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0 && |
| 465 | dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 466 | cmd->t_tasks_fua) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 467 | /* |
| 468 | * We might need to be a bit smarter here |
| 469 | * and return some sense data to let the initiator |
| 470 | * know the FUA WRITE cache sync failed..? |
| 471 | */ |
| 472 | fd_emulate_write_fua(cmd, task); |
| 473 | } |
| 474 | |
| 475 | } |
| 476 | |
| 477 | if (ret < 0) |
| 478 | return ret; |
| 479 | if (ret) { |
| 480 | task->task_scsi_status = GOOD; |
| 481 | transport_complete_task(task, 1); |
| 482 | } |
| 483 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; |
| 484 | } |
| 485 | |
| 486 | /* fd_free_task(): (Part of se_subsystem_api_t template) |
| 487 | * |
| 488 | * |
| 489 | */ |
| 490 | static void fd_free_task(struct se_task *task) |
| 491 | { |
| 492 | struct fd_request *req = FILE_REQ(task); |
| 493 | |
| 494 | kfree(req); |
| 495 | } |
| 496 | |
| 497 | enum { |
| 498 | Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err |
| 499 | }; |
| 500 | |
| 501 | static match_table_t tokens = { |
| 502 | {Opt_fd_dev_name, "fd_dev_name=%s"}, |
| 503 | {Opt_fd_dev_size, "fd_dev_size=%s"}, |
Nicholas Bellinger | 58c3e64 | 2011-03-14 04:06:08 -0700 | [diff] [blame] | 504 | {Opt_fd_buffered_io, "fd_buffered_io=%d"}, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 505 | {Opt_err, NULL} |
| 506 | }; |
| 507 | |
| 508 | static ssize_t fd_set_configfs_dev_params( |
| 509 | struct se_hba *hba, |
| 510 | struct se_subsystem_dev *se_dev, |
| 511 | const char *page, ssize_t count) |
| 512 | { |
| 513 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; |
| 514 | char *orig, *ptr, *arg_p, *opts; |
| 515 | substring_t args[MAX_OPT_ARGS]; |
| 516 | int ret = 0, arg, token; |
| 517 | |
| 518 | opts = kstrdup(page, GFP_KERNEL); |
| 519 | if (!opts) |
| 520 | return -ENOMEM; |
| 521 | |
| 522 | orig = opts; |
| 523 | |
| 524 | while ((ptr = strsep(&opts, ",")) != NULL) { |
| 525 | if (!*ptr) |
| 526 | continue; |
| 527 | |
| 528 | token = match_token(ptr, tokens, args); |
| 529 | switch (token) { |
| 530 | case Opt_fd_dev_name: |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 531 | arg_p = match_strdup(&args[0]); |
| 532 | if (!arg_p) { |
| 533 | ret = -ENOMEM; |
| 534 | break; |
| 535 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 536 | snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME, |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 537 | "%s", arg_p); |
| 538 | kfree(arg_p); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 539 | pr_debug("FILEIO: Referencing Path: %s\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 540 | fd_dev->fd_dev_name); |
| 541 | fd_dev->fbd_flags |= FBDF_HAS_PATH; |
| 542 | break; |
| 543 | case Opt_fd_dev_size: |
| 544 | arg_p = match_strdup(&args[0]); |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 545 | if (!arg_p) { |
| 546 | ret = -ENOMEM; |
| 547 | break; |
| 548 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 549 | ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 550 | kfree(arg_p); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 551 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 552 | pr_err("strict_strtoull() failed for" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 553 | " fd_dev_size=\n"); |
| 554 | goto out; |
| 555 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 556 | pr_debug("FILEIO: Referencing Size: %llu" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 557 | " bytes\n", fd_dev->fd_dev_size); |
| 558 | fd_dev->fbd_flags |= FBDF_HAS_SIZE; |
| 559 | break; |
| 560 | case Opt_fd_buffered_io: |
| 561 | match_int(args, &arg); |
| 562 | if (arg != 1) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 563 | pr_err("bogus fd_buffered_io=%d value\n", arg); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 564 | ret = -EINVAL; |
| 565 | goto out; |
| 566 | } |
| 567 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 568 | pr_debug("FILEIO: Using buffered I/O" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 569 | " operations for struct fd_dev\n"); |
| 570 | |
| 571 | fd_dev->fbd_flags |= FDBD_USE_BUFFERED_IO; |
| 572 | break; |
| 573 | default: |
| 574 | break; |
| 575 | } |
| 576 | } |
| 577 | |
| 578 | out: |
| 579 | kfree(orig); |
| 580 | return (!ret) ? count : ret; |
| 581 | } |
| 582 | |
| 583 | static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) |
| 584 | { |
| 585 | struct fd_dev *fd_dev = (struct fd_dev *) se_dev->se_dev_su_ptr; |
| 586 | |
| 587 | if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame^] | 588 | pr_err("Missing fd_dev_name=\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 589 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 590 | } |
| 591 | |
| 592 | return 0; |
| 593 | } |
| 594 | |
| 595 | static ssize_t fd_show_configfs_dev_params( |
| 596 | struct se_hba *hba, |
| 597 | struct se_subsystem_dev *se_dev, |
| 598 | char *b) |
| 599 | { |
| 600 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; |
| 601 | ssize_t bl = 0; |
| 602 | |
| 603 | bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); |
| 604 | bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", |
| 605 | fd_dev->fd_dev_name, fd_dev->fd_dev_size, |
| 606 | (fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO) ? |
| 607 | "Buffered" : "Synchronous"); |
| 608 | return bl; |
| 609 | } |
| 610 | |
| 611 | /* fd_get_cdb(): (Part of se_subsystem_api_t template) |
| 612 | * |
| 613 | * |
| 614 | */ |
| 615 | static unsigned char *fd_get_cdb(struct se_task *task) |
| 616 | { |
| 617 | struct fd_request *req = FILE_REQ(task); |
| 618 | |
| 619 | return req->fd_scsi_cdb; |
| 620 | } |
| 621 | |
| 622 | /* fd_get_device_rev(): (Part of se_subsystem_api_t template) |
| 623 | * |
| 624 | * |
| 625 | */ |
| 626 | static u32 fd_get_device_rev(struct se_device *dev) |
| 627 | { |
| 628 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ |
| 629 | } |
| 630 | |
| 631 | /* fd_get_device_type(): (Part of se_subsystem_api_t template) |
| 632 | * |
| 633 | * |
| 634 | */ |
| 635 | static u32 fd_get_device_type(struct se_device *dev) |
| 636 | { |
| 637 | return TYPE_DISK; |
| 638 | } |
| 639 | |
| 640 | static sector_t fd_get_blocks(struct se_device *dev) |
| 641 | { |
| 642 | struct fd_dev *fd_dev = dev->dev_ptr; |
| 643 | unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 644 | dev->se_sub_dev->se_dev_attrib.block_size); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 645 | |
| 646 | return blocks_long; |
| 647 | } |
| 648 | |
| 649 | static struct se_subsystem_api fileio_template = { |
| 650 | .name = "fileio", |
| 651 | .owner = THIS_MODULE, |
| 652 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, |
| 653 | .attach_hba = fd_attach_hba, |
| 654 | .detach_hba = fd_detach_hba, |
| 655 | .allocate_virtdevice = fd_allocate_virtdevice, |
| 656 | .create_virtdevice = fd_create_virtdevice, |
| 657 | .free_device = fd_free_device, |
| 658 | .dpo_emulated = fd_emulated_dpo, |
| 659 | .fua_write_emulated = fd_emulated_fua_write, |
| 660 | .fua_read_emulated = fd_emulated_fua_read, |
| 661 | .write_cache_emulated = fd_emulated_write_cache, |
| 662 | .alloc_task = fd_alloc_task, |
| 663 | .do_task = fd_do_task, |
| 664 | .do_sync_cache = fd_emulate_sync_cache, |
| 665 | .free_task = fd_free_task, |
| 666 | .check_configfs_dev_params = fd_check_configfs_dev_params, |
| 667 | .set_configfs_dev_params = fd_set_configfs_dev_params, |
| 668 | .show_configfs_dev_params = fd_show_configfs_dev_params, |
| 669 | .get_cdb = fd_get_cdb, |
| 670 | .get_device_rev = fd_get_device_rev, |
| 671 | .get_device_type = fd_get_device_type, |
| 672 | .get_blocks = fd_get_blocks, |
| 673 | }; |
| 674 | |
| 675 | static int __init fileio_module_init(void) |
| 676 | { |
| 677 | return transport_subsystem_register(&fileio_template); |
| 678 | } |
| 679 | |
| 680 | static void fileio_module_exit(void) |
| 681 | { |
| 682 | transport_subsystem_release(&fileio_template); |
| 683 | } |
| 684 | |
| 685 | MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); |
| 686 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); |
| 687 | MODULE_LICENSE("GPL"); |
| 688 | |
| 689 | module_init(fileio_module_init); |
| 690 | module_exit(fileio_module_exit); |