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 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 29 | #include <linux/string.h> |
| 30 | #include <linux/parser.h> |
| 31 | #include <linux/timer.h> |
| 32 | #include <linux/blkdev.h> |
| 33 | #include <linux/slab.h> |
| 34 | #include <linux/spinlock.h> |
Paul Gortmaker | 827509e | 2011-08-30 14:20:44 -0400 | [diff] [blame] | 35 | #include <linux/module.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> |
Christoph Hellwig | c4795fb | 2011-11-16 09:46:48 -0500 | [diff] [blame] | 40 | #include <target/target_core_backend.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 41 | |
| 42 | #include "target_core_file.h" |
| 43 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 44 | static struct se_subsystem_api fileio_template; |
| 45 | |
| 46 | /* fd_attach_hba(): (Part of se_subsystem_api_t template) |
| 47 | * |
| 48 | * |
| 49 | */ |
| 50 | static int fd_attach_hba(struct se_hba *hba, u32 host_id) |
| 51 | { |
| 52 | struct fd_host *fd_host; |
| 53 | |
| 54 | fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 55 | if (!fd_host) { |
| 56 | pr_err("Unable to allocate memory for struct fd_host\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 57 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | fd_host->fd_host_id = host_id; |
| 61 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 62 | hba->hba_ptr = fd_host; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 63 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 64 | pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 65 | " Target Core Stack %s\n", hba->hba_id, FD_VERSION, |
| 66 | TARGET_CORE_MOD_VERSION); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 67 | pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 68 | " MaxSectors: %u\n", |
| 69 | hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 70 | |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | static void fd_detach_hba(struct se_hba *hba) |
| 75 | { |
| 76 | struct fd_host *fd_host = hba->hba_ptr; |
| 77 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 78 | pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 79 | " Target Core\n", hba->hba_id, fd_host->fd_host_id); |
| 80 | |
| 81 | kfree(fd_host); |
| 82 | hba->hba_ptr = NULL; |
| 83 | } |
| 84 | |
| 85 | static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name) |
| 86 | { |
| 87 | struct fd_dev *fd_dev; |
Jörn Engel | 8359cf4 | 2011-11-24 02:05:51 +0100 | [diff] [blame] | 88 | struct fd_host *fd_host = hba->hba_ptr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 89 | |
| 90 | fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 91 | if (!fd_dev) { |
| 92 | pr_err("Unable to allocate memory for struct fd_dev\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 93 | return NULL; |
| 94 | } |
| 95 | |
| 96 | fd_dev->fd_host = fd_host; |
| 97 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 98 | pr_debug("FILEIO: Allocated fd_dev for %p\n", name); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 99 | |
| 100 | return fd_dev; |
| 101 | } |
| 102 | |
| 103 | /* fd_create_virtdevice(): (Part of se_subsystem_api_t template) |
| 104 | * |
| 105 | * |
| 106 | */ |
| 107 | static struct se_device *fd_create_virtdevice( |
| 108 | struct se_hba *hba, |
| 109 | struct se_subsystem_dev *se_dev, |
| 110 | void *p) |
| 111 | { |
| 112 | char *dev_p = NULL; |
| 113 | struct se_device *dev; |
| 114 | struct se_dev_limits dev_limits; |
| 115 | struct queue_limits *limits; |
Jörn Engel | 8359cf4 | 2011-11-24 02:05:51 +0100 | [diff] [blame] | 116 | struct fd_dev *fd_dev = p; |
| 117 | struct fd_host *fd_host = hba->hba_ptr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 118 | mm_segment_t old_fs; |
| 119 | struct file *file; |
| 120 | struct inode *inode = NULL; |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 121 | int dev_flags = 0, flags, ret = -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 122 | |
| 123 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); |
| 124 | |
| 125 | old_fs = get_fs(); |
| 126 | set_fs(get_ds()); |
| 127 | dev_p = getname(fd_dev->fd_dev_name); |
| 128 | set_fs(old_fs); |
| 129 | |
| 130 | if (IS_ERR(dev_p)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 131 | pr_err("getname(%s) failed: %lu\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 132 | fd_dev->fd_dev_name, IS_ERR(dev_p)); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 133 | ret = PTR_ERR(dev_p); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 134 | goto fail; |
| 135 | } |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 136 | |
| 137 | /* O_DIRECT too? */ |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 138 | flags = O_RDWR | O_CREAT | O_LARGEFILE; |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 139 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 140 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 141 | * If fd_buffered_io=1 has not been set explicitly (the default), |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 142 | * use O_SYNC to force FILEIO writes to disk. |
| 143 | */ |
| 144 | if (!(fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO)) |
| 145 | flags |= O_SYNC; |
| 146 | |
| 147 | file = filp_open(dev_p, flags, 0600); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 148 | if (IS_ERR(file)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 149 | pr_err("filp_open(%s) failed\n", dev_p); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 150 | ret = PTR_ERR(file); |
| 151 | goto fail; |
| 152 | } |
| 153 | if (!file || !file->f_dentry) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 154 | pr_err("filp_open(%s) failed\n", dev_p); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 155 | goto fail; |
| 156 | } |
| 157 | fd_dev->fd_file = file; |
| 158 | /* |
| 159 | * If using a block backend with this struct file, we extract |
| 160 | * fd_dev->fd_[block,dev]_size from struct block_device. |
| 161 | * |
| 162 | * Otherwise, we use the passed fd_size= from configfs |
| 163 | */ |
| 164 | inode = file->f_mapping->host; |
| 165 | if (S_ISBLK(inode->i_mode)) { |
| 166 | struct request_queue *q; |
| 167 | /* |
| 168 | * Setup the local scope queue_limits from struct request_queue->limits |
| 169 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. |
| 170 | */ |
| 171 | q = bdev_get_queue(inode->i_bdev); |
| 172 | limits = &dev_limits.limits; |
| 173 | limits->logical_block_size = bdev_logical_block_size(inode->i_bdev); |
| 174 | limits->max_hw_sectors = queue_max_hw_sectors(q); |
| 175 | limits->max_sectors = queue_max_sectors(q); |
| 176 | /* |
| 177 | * Determine the number of bytes from i_size_read() minus |
| 178 | * one (1) logical sector from underlying struct block_device |
| 179 | */ |
| 180 | fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); |
| 181 | fd_dev->fd_dev_size = (i_size_read(file->f_mapping->host) - |
| 182 | fd_dev->fd_block_size); |
| 183 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 184 | pr_debug("FILEIO: Using size: %llu bytes from struct" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 185 | " block_device blocks: %llu logical_block_size: %d\n", |
| 186 | fd_dev->fd_dev_size, |
| 187 | div_u64(fd_dev->fd_dev_size, fd_dev->fd_block_size), |
| 188 | fd_dev->fd_block_size); |
| 189 | } else { |
| 190 | if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 191 | pr_err("FILEIO: Missing fd_dev_size=" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 192 | " parameter, and no backing struct" |
| 193 | " block_device\n"); |
| 194 | goto fail; |
| 195 | } |
| 196 | |
| 197 | limits = &dev_limits.limits; |
| 198 | limits->logical_block_size = FD_BLOCKSIZE; |
| 199 | limits->max_hw_sectors = FD_MAX_SECTORS; |
| 200 | limits->max_sectors = FD_MAX_SECTORS; |
| 201 | fd_dev->fd_block_size = FD_BLOCKSIZE; |
| 202 | } |
| 203 | |
| 204 | dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; |
| 205 | dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH; |
| 206 | |
| 207 | dev = transport_add_device_to_core_hba(hba, &fileio_template, |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 208 | se_dev, dev_flags, fd_dev, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 209 | &dev_limits, "FILEIO", FD_VERSION); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 210 | if (!dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 211 | goto fail; |
| 212 | |
| 213 | fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; |
| 214 | fd_dev->fd_queue_depth = dev->queue_depth; |
| 215 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 216 | 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] | 217 | " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, |
| 218 | fd_dev->fd_dev_name, fd_dev->fd_dev_size); |
| 219 | |
| 220 | putname(dev_p); |
| 221 | return dev; |
| 222 | fail: |
| 223 | if (fd_dev->fd_file) { |
| 224 | filp_close(fd_dev->fd_file, NULL); |
| 225 | fd_dev->fd_file = NULL; |
| 226 | } |
| 227 | putname(dev_p); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 228 | return ERR_PTR(ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | /* fd_free_device(): (Part of se_subsystem_api_t template) |
| 232 | * |
| 233 | * |
| 234 | */ |
| 235 | static void fd_free_device(void *p) |
| 236 | { |
Jörn Engel | 8359cf4 | 2011-11-24 02:05:51 +0100 | [diff] [blame] | 237 | struct fd_dev *fd_dev = p; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 238 | |
| 239 | if (fd_dev->fd_file) { |
| 240 | filp_close(fd_dev->fd_file, NULL); |
| 241 | fd_dev->fd_file = NULL; |
| 242 | } |
| 243 | |
| 244 | kfree(fd_dev); |
| 245 | } |
| 246 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 247 | static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl, |
| 248 | u32 sgl_nents) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 249 | { |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 250 | struct se_device *se_dev = cmd->se_dev; |
Christoph Hellwig | 42bf829 | 2011-10-12 11:07:00 -0400 | [diff] [blame] | 251 | struct fd_dev *dev = se_dev->dev_ptr; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 252 | struct file *fd = dev->fd_file; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 253 | struct scatterlist *sg; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 254 | struct iovec *iov; |
| 255 | mm_segment_t old_fs; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 256 | loff_t pos = (cmd->t_task_lba * |
Christoph Hellwig | 42bf829 | 2011-10-12 11:07:00 -0400 | [diff] [blame] | 257 | se_dev->se_sub_dev->se_dev_attrib.block_size); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 258 | int ret = 0, i; |
| 259 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 260 | iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 261 | if (!iov) { |
| 262 | pr_err("Unable to allocate fd_do_readv iov[]\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 263 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 264 | } |
| 265 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 266 | for_each_sg(sgl, sg, sgl_nents, i) { |
Sebastian Andrzej Siewior | 9649fa1 | 2011-11-28 12:33:10 +0100 | [diff] [blame] | 267 | iov[i].iov_len = sg->length; |
| 268 | iov[i].iov_base = sg_virt(sg); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 269 | } |
| 270 | |
| 271 | old_fs = get_fs(); |
| 272 | set_fs(get_ds()); |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 273 | ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 274 | set_fs(old_fs); |
| 275 | |
| 276 | kfree(iov); |
| 277 | /* |
| 278 | * Return zeros and GOOD status even if the READ did not return |
| 279 | * the expected virt_size for struct file w/o a backing struct |
| 280 | * block_device. |
| 281 | */ |
| 282 | if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 283 | if (ret < 0 || ret != cmd->data_length) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 284 | pr_err("vfs_readv() returned %d," |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 285 | " expecting %d for S_ISBLK\n", ret, |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 286 | (int)cmd->data_length); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 287 | return (ret < 0 ? ret : -EINVAL); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 288 | } |
| 289 | } else { |
| 290 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 291 | pr_err("vfs_readv() returned %d for non" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 292 | " S_ISBLK\n", ret); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 293 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 294 | } |
| 295 | } |
| 296 | |
| 297 | return 1; |
| 298 | } |
| 299 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 300 | static int fd_do_writev(struct se_cmd *cmd, struct scatterlist *sgl, |
| 301 | u32 sgl_nents) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 302 | { |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 303 | struct se_device *se_dev = cmd->se_dev; |
Christoph Hellwig | 42bf829 | 2011-10-12 11:07:00 -0400 | [diff] [blame] | 304 | struct fd_dev *dev = se_dev->dev_ptr; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 305 | struct file *fd = dev->fd_file; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 306 | struct scatterlist *sg; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 307 | struct iovec *iov; |
| 308 | mm_segment_t old_fs; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 309 | loff_t pos = (cmd->t_task_lba * |
Christoph Hellwig | 42bf829 | 2011-10-12 11:07:00 -0400 | [diff] [blame] | 310 | se_dev->se_sub_dev->se_dev_attrib.block_size); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 311 | int ret, i = 0; |
| 312 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 313 | iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 314 | if (!iov) { |
| 315 | pr_err("Unable to allocate fd_do_writev iov[]\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 316 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 317 | } |
| 318 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 319 | for_each_sg(sgl, sg, sgl_nents, i) { |
Sebastian Andrzej Siewior | 9649fa1 | 2011-11-28 12:33:10 +0100 | [diff] [blame] | 320 | iov[i].iov_len = sg->length; |
| 321 | iov[i].iov_base = sg_virt(sg); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | old_fs = get_fs(); |
| 325 | set_fs(get_ds()); |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 326 | ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 327 | set_fs(old_fs); |
| 328 | |
| 329 | kfree(iov); |
| 330 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 331 | if (ret < 0 || ret != cmd->data_length) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 332 | pr_err("vfs_writev() returned %d\n", ret); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 333 | return (ret < 0 ? ret : -EINVAL); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 334 | } |
| 335 | |
| 336 | return 1; |
| 337 | } |
| 338 | |
Christoph Hellwig | 6bb35e0 | 2012-04-23 11:35:33 -0400 | [diff] [blame] | 339 | static void fd_emulate_sync_cache(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 340 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 341 | struct se_device *dev = cmd->se_dev; |
| 342 | struct fd_dev *fd_dev = dev->dev_ptr; |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 343 | int immed = (cmd->t_task_cdb[1] & 0x2); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 344 | loff_t start, end; |
| 345 | int ret; |
| 346 | |
| 347 | /* |
| 348 | * If the Immediate bit is set, queue up the GOOD response |
| 349 | * for this SYNCHRONIZE_CACHE op |
| 350 | */ |
| 351 | if (immed) |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 352 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 353 | |
| 354 | /* |
| 355 | * Determine if we will be flushing the entire device. |
| 356 | */ |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 357 | if (cmd->t_task_lba == 0 && cmd->data_length == 0) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 358 | start = 0; |
| 359 | end = LLONG_MAX; |
| 360 | } else { |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 361 | 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] | 362 | if (cmd->data_length) |
| 363 | end = start + cmd->data_length; |
| 364 | else |
| 365 | end = LLONG_MAX; |
| 366 | } |
| 367 | |
| 368 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); |
| 369 | if (ret != 0) |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 370 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 371 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 372 | if (immed) |
| 373 | return; |
| 374 | |
| 375 | if (ret) { |
| 376 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 377 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
| 378 | } else { |
| 379 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
| 380 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 381 | } |
| 382 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 383 | static void fd_emulate_write_fua(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 384 | { |
| 385 | struct se_device *dev = cmd->se_dev; |
| 386 | struct fd_dev *fd_dev = dev->dev_ptr; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 387 | loff_t start = cmd->t_task_lba * |
Christoph Hellwig | 72a0e5e | 2012-04-23 11:35:30 -0400 | [diff] [blame] | 388 | dev->se_sub_dev->se_dev_attrib.block_size; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 389 | loff_t end = start + cmd->data_length; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 390 | int ret; |
| 391 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 392 | pr_debug("FILEIO: FUA WRITE LBA: %llu, bytes: %u\n", |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 393 | cmd->t_task_lba, cmd->data_length); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 394 | |
| 395 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); |
| 396 | if (ret != 0) |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 397 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 398 | } |
| 399 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 400 | static int fd_execute_cmd(struct se_cmd *cmd, struct scatterlist *sgl, |
| 401 | u32 sgl_nents, enum dma_data_direction data_direction) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 402 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 403 | struct se_device *dev = cmd->se_dev; |
| 404 | int ret = 0; |
| 405 | |
| 406 | /* |
| 407 | * Call vectorized fileio functions to map struct scatterlist |
| 408 | * physical memory addresses to struct iovec virtual memory. |
| 409 | */ |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 410 | if (data_direction == DMA_FROM_DEVICE) { |
| 411 | ret = fd_do_readv(cmd, sgl, sgl_nents); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 412 | } else { |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 413 | ret = fd_do_writev(cmd, sgl, sgl_nents); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 414 | |
| 415 | if (ret > 0 && |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 416 | dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0 && |
| 417 | dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && |
Christoph Hellwig | 2d3a4b5 | 2011-11-14 11:36:29 -0500 | [diff] [blame] | 418 | (cmd->se_cmd_flags & SCF_FUA)) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 419 | /* |
| 420 | * We might need to be a bit smarter here |
| 421 | * and return some sense data to let the initiator |
| 422 | * know the FUA WRITE cache sync failed..? |
| 423 | */ |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 424 | fd_emulate_write_fua(cmd); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 425 | } |
| 426 | |
| 427 | } |
| 428 | |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 429 | if (ret < 0) { |
| 430 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 431 | return ret; |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 432 | } |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 433 | if (ret) |
| 434 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 435 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 436 | } |
| 437 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 438 | enum { |
| 439 | Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err |
| 440 | }; |
| 441 | |
| 442 | static match_table_t tokens = { |
| 443 | {Opt_fd_dev_name, "fd_dev_name=%s"}, |
| 444 | {Opt_fd_dev_size, "fd_dev_size=%s"}, |
Nicholas Bellinger | 58c3e64 | 2011-03-14 04:06:08 -0700 | [diff] [blame] | 445 | {Opt_fd_buffered_io, "fd_buffered_io=%d"}, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 446 | {Opt_err, NULL} |
| 447 | }; |
| 448 | |
| 449 | static ssize_t fd_set_configfs_dev_params( |
| 450 | struct se_hba *hba, |
| 451 | struct se_subsystem_dev *se_dev, |
| 452 | const char *page, ssize_t count) |
| 453 | { |
| 454 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; |
| 455 | char *orig, *ptr, *arg_p, *opts; |
| 456 | substring_t args[MAX_OPT_ARGS]; |
| 457 | int ret = 0, arg, token; |
| 458 | |
| 459 | opts = kstrdup(page, GFP_KERNEL); |
| 460 | if (!opts) |
| 461 | return -ENOMEM; |
| 462 | |
| 463 | orig = opts; |
| 464 | |
Sebastian Andrzej Siewior | 90c161b | 2011-11-23 20:53:17 +0100 | [diff] [blame] | 465 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 466 | if (!*ptr) |
| 467 | continue; |
| 468 | |
| 469 | token = match_token(ptr, tokens, args); |
| 470 | switch (token) { |
| 471 | case Opt_fd_dev_name: |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 472 | arg_p = match_strdup(&args[0]); |
| 473 | if (!arg_p) { |
| 474 | ret = -ENOMEM; |
| 475 | break; |
| 476 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 477 | snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME, |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 478 | "%s", arg_p); |
| 479 | kfree(arg_p); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 480 | pr_debug("FILEIO: Referencing Path: %s\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 481 | fd_dev->fd_dev_name); |
| 482 | fd_dev->fbd_flags |= FBDF_HAS_PATH; |
| 483 | break; |
| 484 | case Opt_fd_dev_size: |
| 485 | arg_p = match_strdup(&args[0]); |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 486 | if (!arg_p) { |
| 487 | ret = -ENOMEM; |
| 488 | break; |
| 489 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 490 | ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 491 | kfree(arg_p); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 492 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 493 | pr_err("strict_strtoull() failed for" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 494 | " fd_dev_size=\n"); |
| 495 | goto out; |
| 496 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 497 | pr_debug("FILEIO: Referencing Size: %llu" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 498 | " bytes\n", fd_dev->fd_dev_size); |
| 499 | fd_dev->fbd_flags |= FBDF_HAS_SIZE; |
| 500 | break; |
| 501 | case Opt_fd_buffered_io: |
| 502 | match_int(args, &arg); |
| 503 | if (arg != 1) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 504 | pr_err("bogus fd_buffered_io=%d value\n", arg); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 505 | ret = -EINVAL; |
| 506 | goto out; |
| 507 | } |
| 508 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 509 | pr_debug("FILEIO: Using buffered I/O" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 510 | " operations for struct fd_dev\n"); |
| 511 | |
| 512 | fd_dev->fbd_flags |= FDBD_USE_BUFFERED_IO; |
| 513 | break; |
| 514 | default: |
| 515 | break; |
| 516 | } |
| 517 | } |
| 518 | |
| 519 | out: |
| 520 | kfree(orig); |
| 521 | return (!ret) ? count : ret; |
| 522 | } |
| 523 | |
| 524 | static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) |
| 525 | { |
Jörn Engel | 8359cf4 | 2011-11-24 02:05:51 +0100 | [diff] [blame] | 526 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 527 | |
| 528 | if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 529 | pr_err("Missing fd_dev_name=\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 530 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 531 | } |
| 532 | |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | static ssize_t fd_show_configfs_dev_params( |
| 537 | struct se_hba *hba, |
| 538 | struct se_subsystem_dev *se_dev, |
| 539 | char *b) |
| 540 | { |
| 541 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; |
| 542 | ssize_t bl = 0; |
| 543 | |
| 544 | bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); |
| 545 | bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", |
| 546 | fd_dev->fd_dev_name, fd_dev->fd_dev_size, |
| 547 | (fd_dev->fbd_flags & FDBD_USE_BUFFERED_IO) ? |
| 548 | "Buffered" : "Synchronous"); |
| 549 | return bl; |
| 550 | } |
| 551 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 552 | /* fd_get_device_rev(): (Part of se_subsystem_api_t template) |
| 553 | * |
| 554 | * |
| 555 | */ |
| 556 | static u32 fd_get_device_rev(struct se_device *dev) |
| 557 | { |
| 558 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ |
| 559 | } |
| 560 | |
| 561 | /* fd_get_device_type(): (Part of se_subsystem_api_t template) |
| 562 | * |
| 563 | * |
| 564 | */ |
| 565 | static u32 fd_get_device_type(struct se_device *dev) |
| 566 | { |
| 567 | return TYPE_DISK; |
| 568 | } |
| 569 | |
| 570 | static sector_t fd_get_blocks(struct se_device *dev) |
| 571 | { |
| 572 | struct fd_dev *fd_dev = dev->dev_ptr; |
| 573 | unsigned long long blocks_long = div_u64(fd_dev->fd_dev_size, |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 574 | dev->se_sub_dev->se_dev_attrib.block_size); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 575 | |
| 576 | return blocks_long; |
| 577 | } |
| 578 | |
| 579 | static struct se_subsystem_api fileio_template = { |
| 580 | .name = "fileio", |
| 581 | .owner = THIS_MODULE, |
| 582 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, |
Christoph Hellwig | f55918f | 2011-10-14 07:30:17 -0400 | [diff] [blame] | 583 | .write_cache_emulated = 1, |
| 584 | .fua_write_emulated = 1, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 585 | .attach_hba = fd_attach_hba, |
| 586 | .detach_hba = fd_detach_hba, |
| 587 | .allocate_virtdevice = fd_allocate_virtdevice, |
| 588 | .create_virtdevice = fd_create_virtdevice, |
| 589 | .free_device = fd_free_device, |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 590 | .execute_cmd = fd_execute_cmd, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 591 | .do_sync_cache = fd_emulate_sync_cache, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 592 | .check_configfs_dev_params = fd_check_configfs_dev_params, |
| 593 | .set_configfs_dev_params = fd_set_configfs_dev_params, |
| 594 | .show_configfs_dev_params = fd_show_configfs_dev_params, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 595 | .get_device_rev = fd_get_device_rev, |
| 596 | .get_device_type = fd_get_device_type, |
| 597 | .get_blocks = fd_get_blocks, |
| 598 | }; |
| 599 | |
| 600 | static int __init fileio_module_init(void) |
| 601 | { |
| 602 | return transport_subsystem_register(&fileio_template); |
| 603 | } |
| 604 | |
| 605 | static void fileio_module_exit(void) |
| 606 | { |
| 607 | transport_subsystem_release(&fileio_template); |
| 608 | } |
| 609 | |
| 610 | MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); |
| 611 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); |
| 612 | MODULE_LICENSE("GPL"); |
| 613 | |
| 614 | module_init(fileio_module_init); |
| 615 | module_exit(fileio_module_exit); |