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 | * |
Nicholas Bellinger | fd9a11d | 2012-11-09 14:51:48 -0800 | [diff] [blame] | 6 | * (c) Copyright 2005-2012 RisingTide Systems LLC. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 7 | * |
| 8 | * Nicholas A. Bellinger <nab@kernel.org> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 23 | * |
| 24 | ******************************************************************************/ |
| 25 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 26 | #include <linux/string.h> |
| 27 | #include <linux/parser.h> |
| 28 | #include <linux/timer.h> |
| 29 | #include <linux/blkdev.h> |
| 30 | #include <linux/slab.h> |
| 31 | #include <linux/spinlock.h> |
Paul Gortmaker | 827509e | 2011-08-30 14:20:44 -0400 | [diff] [blame] | 32 | #include <linux/module.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 33 | #include <scsi/scsi.h> |
| 34 | #include <scsi/scsi_host.h> |
| 35 | |
| 36 | #include <target/target_core_base.h> |
Christoph Hellwig | c4795fb | 2011-11-16 09:46:48 -0500 | [diff] [blame] | 37 | #include <target/target_core_backend.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 38 | |
| 39 | #include "target_core_file.h" |
| 40 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 41 | static inline struct fd_dev *FD_DEV(struct se_device *dev) |
| 42 | { |
| 43 | return container_of(dev, struct fd_dev, dev); |
| 44 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 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 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 85 | static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 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 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 100 | return &fd_dev->dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 101 | } |
| 102 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 103 | static int fd_configure_device(struct se_device *dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 104 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 105 | struct fd_dev *fd_dev = FD_DEV(dev); |
| 106 | struct fd_host *fd_host = dev->se_hba->hba_ptr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 107 | struct file *file; |
| 108 | struct inode *inode = NULL; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 109 | int flags, ret = -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 110 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 111 | if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { |
| 112 | pr_err("Missing fd_dev_name=\n"); |
| 113 | return -EINVAL; |
| 114 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 115 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 116 | /* |
Nicholas Bellinger | a4dff30 | 2012-05-30 16:25:41 -0700 | [diff] [blame] | 117 | * Use O_DSYNC by default instead of O_SYNC to forgo syncing |
| 118 | * of pure timestamp updates. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 119 | */ |
Nicholas Bellinger | a4dff30 | 2012-05-30 16:25:41 -0700 | [diff] [blame] | 120 | flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 121 | |
Nicholas Bellinger | b32f4c7 | 2012-09-29 17:15:37 -0700 | [diff] [blame] | 122 | /* |
| 123 | * Optionally allow fd_buffered_io=1 to be enabled for people |
| 124 | * who want use the fs buffer cache as an WriteCache mechanism. |
| 125 | * |
| 126 | * This means that in event of a hard failure, there is a risk |
| 127 | * of silent data-loss if the SCSI client has *not* performed a |
| 128 | * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE |
| 129 | * to write-out the entire device cache. |
| 130 | */ |
| 131 | if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { |
| 132 | pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); |
| 133 | flags &= ~O_DSYNC; |
| 134 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 135 | |
Al Viro | dbc6e02 | 2012-08-01 13:07:04 +0400 | [diff] [blame] | 136 | file = filp_open(fd_dev->fd_dev_name, flags, 0600); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 137 | if (IS_ERR(file)) { |
Al Viro | dbc6e02 | 2012-08-01 13:07:04 +0400 | [diff] [blame] | 138 | pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 139 | ret = PTR_ERR(file); |
| 140 | goto fail; |
| 141 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 142 | fd_dev->fd_file = file; |
| 143 | /* |
| 144 | * If using a block backend with this struct file, we extract |
| 145 | * fd_dev->fd_[block,dev]_size from struct block_device. |
| 146 | * |
| 147 | * Otherwise, we use the passed fd_size= from configfs |
| 148 | */ |
| 149 | inode = file->f_mapping->host; |
| 150 | if (S_ISBLK(inode->i_mode)) { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 151 | struct request_queue *q = bdev_get_queue(inode->i_bdev); |
Nicholas Bellinger | cd9323f | 2012-05-16 16:05:26 -0700 | [diff] [blame] | 152 | unsigned long long dev_size; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 153 | |
| 154 | dev->dev_attrib.hw_block_size = |
| 155 | bdev_logical_block_size(inode->i_bdev); |
| 156 | dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); |
| 157 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 158 | /* |
| 159 | * Determine the number of bytes from i_size_read() minus |
| 160 | * one (1) logical sector from underlying struct block_device |
| 161 | */ |
Nicholas Bellinger | cd9323f | 2012-05-16 16:05:26 -0700 | [diff] [blame] | 162 | dev_size = (i_size_read(file->f_mapping->host) - |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 163 | fd_dev->fd_block_size); |
| 164 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 165 | pr_debug("FILEIO: Using size: %llu bytes from struct" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 166 | " block_device blocks: %llu logical_block_size: %d\n", |
Nicholas Bellinger | cd9323f | 2012-05-16 16:05:26 -0700 | [diff] [blame] | 167 | dev_size, div_u64(dev_size, fd_dev->fd_block_size), |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 168 | fd_dev->fd_block_size); |
| 169 | } else { |
| 170 | if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 171 | pr_err("FILEIO: Missing fd_dev_size=" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 172 | " parameter, and no backing struct" |
| 173 | " block_device\n"); |
| 174 | goto fail; |
| 175 | } |
| 176 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 177 | dev->dev_attrib.hw_block_size = FD_BLOCKSIZE; |
| 178 | dev->dev_attrib.hw_max_sectors = FD_MAX_SECTORS; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 179 | } |
| 180 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 181 | fd_dev->fd_block_size = dev->dev_attrib.hw_block_size; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 182 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 183 | dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 184 | |
Nicholas Bellinger | b32f4c7 | 2012-09-29 17:15:37 -0700 | [diff] [blame] | 185 | if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { |
| 186 | pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" |
| 187 | " with FDBD_HAS_BUFFERED_IO_WCE\n"); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 188 | dev->dev_attrib.emulate_write_cache = 1; |
Nicholas Bellinger | b32f4c7 | 2012-09-29 17:15:37 -0700 | [diff] [blame] | 189 | } |
| 190 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 191 | fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; |
| 192 | fd_dev->fd_queue_depth = dev->queue_depth; |
| 193 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 194 | 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] | 195 | " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, |
| 196 | fd_dev->fd_dev_name, fd_dev->fd_dev_size); |
| 197 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 198 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 199 | fail: |
| 200 | if (fd_dev->fd_file) { |
| 201 | filp_close(fd_dev->fd_file, NULL); |
| 202 | fd_dev->fd_file = NULL; |
| 203 | } |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 204 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 205 | } |
| 206 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 207 | static void fd_free_device(struct se_device *dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 208 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 209 | struct fd_dev *fd_dev = FD_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 210 | |
| 211 | if (fd_dev->fd_file) { |
| 212 | filp_close(fd_dev->fd_file, NULL); |
| 213 | fd_dev->fd_file = NULL; |
| 214 | } |
| 215 | |
| 216 | kfree(fd_dev); |
| 217 | } |
| 218 | |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame^] | 219 | static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl, |
| 220 | u32 sgl_nents, int is_write) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 221 | { |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 222 | struct se_device *se_dev = cmd->se_dev; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 223 | struct fd_dev *dev = FD_DEV(se_dev); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 224 | struct file *fd = dev->fd_file; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 225 | struct scatterlist *sg; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 226 | struct iovec *iov; |
| 227 | mm_segment_t old_fs; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 228 | loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 229 | int ret = 0, i; |
| 230 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 231 | iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 232 | if (!iov) { |
| 233 | pr_err("Unable to allocate fd_do_readv iov[]\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 234 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 235 | } |
| 236 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 237 | for_each_sg(sgl, sg, sgl_nents, i) { |
Sebastian Andrzej Siewior | 9649fa1 | 2011-11-28 12:33:10 +0100 | [diff] [blame] | 238 | iov[i].iov_len = sg->length; |
Sebastian Andrzej Siewior | 40ff2c3 | 2012-12-05 12:08:29 +0100 | [diff] [blame] | 239 | iov[i].iov_base = kmap(sg_page(sg)) + sg->offset; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 240 | } |
| 241 | |
| 242 | old_fs = get_fs(); |
| 243 | set_fs(get_ds()); |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame^] | 244 | |
| 245 | if (is_write) |
| 246 | ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); |
| 247 | else |
| 248 | ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); |
| 249 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 250 | set_fs(old_fs); |
| 251 | |
Sebastian Andrzej Siewior | 40ff2c3 | 2012-12-05 12:08:29 +0100 | [diff] [blame] | 252 | for_each_sg(sgl, sg, sgl_nents, i) |
| 253 | kunmap(sg_page(sg)); |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame^] | 254 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 255 | kfree(iov); |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame^] | 256 | |
| 257 | if (is_write) { |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 258 | if (ret < 0 || ret != cmd->data_length) { |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame^] | 259 | pr_err("%s() write returned %d\n", __func__, ret); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 260 | return (ret < 0 ? ret : -EINVAL); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 261 | } |
| 262 | } else { |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame^] | 263 | /* |
| 264 | * Return zeros and GOOD status even if the READ did not return |
| 265 | * the expected virt_size for struct file w/o a backing struct |
| 266 | * block_device. |
| 267 | */ |
| 268 | if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { |
| 269 | if (ret < 0 || ret != cmd->data_length) { |
| 270 | pr_err("%s() returned %d, expecting %u for " |
| 271 | "S_ISBLK\n", __func__, ret, |
| 272 | cmd->data_length); |
| 273 | return (ret < 0 ? ret : -EINVAL); |
| 274 | } |
| 275 | } else { |
| 276 | if (ret < 0) { |
| 277 | pr_err("%s() returned %d for non S_ISBLK\n", |
| 278 | __func__, ret); |
| 279 | return ret; |
| 280 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 281 | } |
| 282 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 283 | return 1; |
| 284 | } |
| 285 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 286 | static sense_reason_t |
| 287 | fd_execute_sync_cache(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 288 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 289 | struct se_device *dev = cmd->se_dev; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 290 | struct fd_dev *fd_dev = FD_DEV(dev); |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 291 | int immed = (cmd->t_task_cdb[1] & 0x2); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 292 | loff_t start, end; |
| 293 | int ret; |
| 294 | |
| 295 | /* |
| 296 | * If the Immediate bit is set, queue up the GOOD response |
| 297 | * for this SYNCHRONIZE_CACHE op |
| 298 | */ |
| 299 | if (immed) |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 300 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 301 | |
| 302 | /* |
| 303 | * Determine if we will be flushing the entire device. |
| 304 | */ |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 305 | if (cmd->t_task_lba == 0 && cmd->data_length == 0) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 306 | start = 0; |
| 307 | end = LLONG_MAX; |
| 308 | } else { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 309 | start = cmd->t_task_lba * dev->dev_attrib.block_size; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 310 | if (cmd->data_length) |
| 311 | end = start + cmd->data_length; |
| 312 | else |
| 313 | end = LLONG_MAX; |
| 314 | } |
| 315 | |
| 316 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); |
| 317 | if (ret != 0) |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 318 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 319 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 320 | if (immed) |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 321 | return 0; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 322 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 323 | if (ret) |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 324 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 325 | else |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 326 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 327 | |
| 328 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 329 | } |
| 330 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 331 | static sense_reason_t |
| 332 | fd_execute_rw(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 333 | { |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 334 | struct scatterlist *sgl = cmd->t_data_sg; |
| 335 | u32 sgl_nents = cmd->t_data_nents; |
| 336 | enum dma_data_direction data_direction = cmd->data_direction; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 337 | struct se_device *dev = cmd->se_dev; |
| 338 | int ret = 0; |
| 339 | |
| 340 | /* |
| 341 | * Call vectorized fileio functions to map struct scatterlist |
| 342 | * physical memory addresses to struct iovec virtual memory. |
| 343 | */ |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 344 | if (data_direction == DMA_FROM_DEVICE) { |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame^] | 345 | ret = fd_do_rw(cmd, sgl, sgl_nents, 0); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 346 | } else { |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame^] | 347 | ret = fd_do_rw(cmd, sgl, sgl_nents, 1); |
Nicholas Bellinger | a4dff30 | 2012-05-30 16:25:41 -0700 | [diff] [blame] | 348 | /* |
| 349 | * Perform implict vfs_fsync_range() for fd_do_writev() ops |
| 350 | * for SCSI WRITEs with Forced Unit Access (FUA) set. |
| 351 | * Allow this to happen independent of WCE=0 setting. |
| 352 | */ |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 353 | if (ret > 0 && |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 354 | dev->dev_attrib.emulate_fua_write > 0 && |
Christoph Hellwig | 2d3a4b5 | 2011-11-14 11:36:29 -0500 | [diff] [blame] | 355 | (cmd->se_cmd_flags & SCF_FUA)) { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 356 | struct fd_dev *fd_dev = FD_DEV(dev); |
Nicholas Bellinger | a4dff30 | 2012-05-30 16:25:41 -0700 | [diff] [blame] | 357 | loff_t start = cmd->t_task_lba * |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 358 | dev->dev_attrib.block_size; |
Nicholas Bellinger | a4dff30 | 2012-05-30 16:25:41 -0700 | [diff] [blame] | 359 | loff_t end = start + cmd->data_length; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 360 | |
Nicholas Bellinger | a4dff30 | 2012-05-30 16:25:41 -0700 | [diff] [blame] | 361 | vfs_fsync_range(fd_dev->fd_file, start, end, 1); |
| 362 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 363 | } |
| 364 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 365 | if (ret < 0) |
| 366 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 367 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 368 | if (ret) |
| 369 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 370 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 371 | } |
| 372 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 373 | enum { |
| 374 | Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err |
| 375 | }; |
| 376 | |
| 377 | static match_table_t tokens = { |
| 378 | {Opt_fd_dev_name, "fd_dev_name=%s"}, |
| 379 | {Opt_fd_dev_size, "fd_dev_size=%s"}, |
Nicholas Bellinger | b32f4c7 | 2012-09-29 17:15:37 -0700 | [diff] [blame] | 380 | {Opt_fd_buffered_io, "fd_buffered_io=%d"}, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 381 | {Opt_err, NULL} |
| 382 | }; |
| 383 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 384 | static ssize_t fd_set_configfs_dev_params(struct se_device *dev, |
| 385 | const char *page, ssize_t count) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 386 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 387 | struct fd_dev *fd_dev = FD_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 388 | char *orig, *ptr, *arg_p, *opts; |
| 389 | substring_t args[MAX_OPT_ARGS]; |
Nicholas Bellinger | b32f4c7 | 2012-09-29 17:15:37 -0700 | [diff] [blame] | 390 | int ret = 0, arg, token; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 391 | |
| 392 | opts = kstrdup(page, GFP_KERNEL); |
| 393 | if (!opts) |
| 394 | return -ENOMEM; |
| 395 | |
| 396 | orig = opts; |
| 397 | |
Sebastian Andrzej Siewior | 90c161b | 2011-11-23 20:53:17 +0100 | [diff] [blame] | 398 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 399 | if (!*ptr) |
| 400 | continue; |
| 401 | |
| 402 | token = match_token(ptr, tokens, args); |
| 403 | switch (token) { |
| 404 | case Opt_fd_dev_name: |
Al Viro | dbc6e02 | 2012-08-01 13:07:04 +0400 | [diff] [blame] | 405 | if (match_strlcpy(fd_dev->fd_dev_name, &args[0], |
| 406 | FD_MAX_DEV_NAME) == 0) { |
| 407 | ret = -EINVAL; |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 408 | break; |
| 409 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 410 | pr_debug("FILEIO: Referencing Path: %s\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 411 | fd_dev->fd_dev_name); |
| 412 | fd_dev->fbd_flags |= FBDF_HAS_PATH; |
| 413 | break; |
| 414 | case Opt_fd_dev_size: |
| 415 | arg_p = match_strdup(&args[0]); |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 416 | if (!arg_p) { |
| 417 | ret = -ENOMEM; |
| 418 | break; |
| 419 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 420 | ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 421 | kfree(arg_p); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 422 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 423 | pr_err("strict_strtoull() failed for" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 424 | " fd_dev_size=\n"); |
| 425 | goto out; |
| 426 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 427 | pr_debug("FILEIO: Referencing Size: %llu" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 428 | " bytes\n", fd_dev->fd_dev_size); |
| 429 | fd_dev->fbd_flags |= FBDF_HAS_SIZE; |
| 430 | break; |
Nicholas Bellinger | b32f4c7 | 2012-09-29 17:15:37 -0700 | [diff] [blame] | 431 | case Opt_fd_buffered_io: |
| 432 | match_int(args, &arg); |
| 433 | if (arg != 1) { |
| 434 | pr_err("bogus fd_buffered_io=%d value\n", arg); |
| 435 | ret = -EINVAL; |
| 436 | goto out; |
| 437 | } |
| 438 | |
| 439 | pr_debug("FILEIO: Using buffered I/O" |
| 440 | " operations for struct fd_dev\n"); |
| 441 | |
| 442 | fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; |
| 443 | break; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 444 | default: |
| 445 | break; |
| 446 | } |
| 447 | } |
| 448 | |
| 449 | out: |
| 450 | kfree(orig); |
| 451 | return (!ret) ? count : ret; |
| 452 | } |
| 453 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 454 | static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 455 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 456 | struct fd_dev *fd_dev = FD_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 457 | ssize_t bl = 0; |
| 458 | |
| 459 | bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); |
Nicholas Bellinger | b32f4c7 | 2012-09-29 17:15:37 -0700 | [diff] [blame] | 460 | bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", |
| 461 | fd_dev->fd_dev_name, fd_dev->fd_dev_size, |
| 462 | (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? |
| 463 | "Buffered-WCE" : "O_DSYNC"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 464 | return bl; |
| 465 | } |
| 466 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 467 | static sector_t fd_get_blocks(struct se_device *dev) |
| 468 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 469 | struct fd_dev *fd_dev = FD_DEV(dev); |
Nicholas Bellinger | cd9323f | 2012-05-16 16:05:26 -0700 | [diff] [blame] | 470 | struct file *f = fd_dev->fd_file; |
| 471 | struct inode *i = f->f_mapping->host; |
| 472 | unsigned long long dev_size; |
| 473 | /* |
| 474 | * When using a file that references an underlying struct block_device, |
| 475 | * ensure dev_size is always based on the current inode size in order |
| 476 | * to handle underlying block_device resize operations. |
| 477 | */ |
| 478 | if (S_ISBLK(i->i_mode)) |
| 479 | dev_size = (i_size_read(i) - fd_dev->fd_block_size); |
| 480 | else |
| 481 | dev_size = fd_dev->fd_dev_size; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 482 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 483 | return div_u64(dev_size, dev->dev_attrib.block_size); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 484 | } |
| 485 | |
Christoph Hellwig | 9e999a6 | 2012-10-07 10:55:50 -0400 | [diff] [blame] | 486 | static struct sbc_ops fd_sbc_ops = { |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 487 | .execute_rw = fd_execute_rw, |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 488 | .execute_sync_cache = fd_execute_sync_cache, |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 489 | }; |
| 490 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 491 | static sense_reason_t |
| 492 | fd_parse_cdb(struct se_cmd *cmd) |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 493 | { |
Christoph Hellwig | 9e999a6 | 2012-10-07 10:55:50 -0400 | [diff] [blame] | 494 | return sbc_parse_cdb(cmd, &fd_sbc_ops); |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 495 | } |
| 496 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 497 | static struct se_subsystem_api fileio_template = { |
| 498 | .name = "fileio", |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 499 | .inquiry_prod = "FILEIO", |
| 500 | .inquiry_rev = FD_VERSION, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 501 | .owner = THIS_MODULE, |
| 502 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, |
| 503 | .attach_hba = fd_attach_hba, |
| 504 | .detach_hba = fd_detach_hba, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 505 | .alloc_device = fd_alloc_device, |
| 506 | .configure_device = fd_configure_device, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 507 | .free_device = fd_free_device, |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 508 | .parse_cdb = fd_parse_cdb, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 509 | .set_configfs_dev_params = fd_set_configfs_dev_params, |
| 510 | .show_configfs_dev_params = fd_show_configfs_dev_params, |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 511 | .get_device_type = sbc_get_device_type, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 512 | .get_blocks = fd_get_blocks, |
| 513 | }; |
| 514 | |
| 515 | static int __init fileio_module_init(void) |
| 516 | { |
| 517 | return transport_subsystem_register(&fileio_template); |
| 518 | } |
| 519 | |
| 520 | static void fileio_module_exit(void) |
| 521 | { |
| 522 | transport_subsystem_release(&fileio_template); |
| 523 | } |
| 524 | |
| 525 | MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); |
| 526 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); |
| 527 | MODULE_LICENSE("GPL"); |
| 528 | |
| 529 | module_init(fileio_module_init); |
| 530 | module_exit(fileio_module_exit); |