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> |
Asias He | 70d3ae5c | 2013-02-25 14:03:42 +0800 | [diff] [blame] | 33 | #include <linux/falloc.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 34 | #include <scsi/scsi.h> |
| 35 | #include <scsi/scsi_host.h> |
Asias He | 5064276 | 2013-02-25 14:03:43 +0800 | [diff] [blame] | 36 | #include <asm/unaligned.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 37 | |
| 38 | #include <target/target_core_base.h> |
Christoph Hellwig | c4795fb | 2011-11-16 09:46:48 -0500 | [diff] [blame] | 39 | #include <target/target_core_backend.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 40 | |
| 41 | #include "target_core_file.h" |
| 42 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 43 | static inline struct fd_dev *FD_DEV(struct se_device *dev) |
| 44 | { |
| 45 | return container_of(dev, struct fd_dev, dev); |
| 46 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 47 | |
| 48 | /* fd_attach_hba(): (Part of se_subsystem_api_t template) |
| 49 | * |
| 50 | * |
| 51 | */ |
| 52 | static int fd_attach_hba(struct se_hba *hba, u32 host_id) |
| 53 | { |
| 54 | struct fd_host *fd_host; |
| 55 | |
| 56 | fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 57 | if (!fd_host) { |
| 58 | pr_err("Unable to allocate memory for struct fd_host\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 59 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | fd_host->fd_host_id = host_id; |
| 63 | |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 64 | hba->hba_ptr = fd_host; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 65 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 66 | pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 67 | " Target Core Stack %s\n", hba->hba_id, FD_VERSION, |
| 68 | TARGET_CORE_MOD_VERSION); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 69 | pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 70 | " MaxSectors: %u\n", |
| 71 | hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 72 | |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | static void fd_detach_hba(struct se_hba *hba) |
| 77 | { |
| 78 | struct fd_host *fd_host = hba->hba_ptr; |
| 79 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 80 | pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 81 | " Target Core\n", hba->hba_id, fd_host->fd_host_id); |
| 82 | |
| 83 | kfree(fd_host); |
| 84 | hba->hba_ptr = NULL; |
| 85 | } |
| 86 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 87 | 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] | 88 | { |
| 89 | struct fd_dev *fd_dev; |
Jörn Engel | 8359cf4 | 2011-11-24 02:05:51 +0100 | [diff] [blame] | 90 | struct fd_host *fd_host = hba->hba_ptr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 91 | |
| 92 | fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 93 | if (!fd_dev) { |
| 94 | pr_err("Unable to allocate memory for struct fd_dev\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 95 | return NULL; |
| 96 | } |
| 97 | |
| 98 | fd_dev->fd_host = fd_host; |
| 99 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 100 | pr_debug("FILEIO: Allocated fd_dev for %p\n", name); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 101 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 102 | return &fd_dev->dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 103 | } |
| 104 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 105 | static int fd_configure_device(struct se_device *dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 106 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 107 | struct fd_dev *fd_dev = FD_DEV(dev); |
| 108 | struct fd_host *fd_host = dev->se_hba->hba_ptr; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 109 | struct file *file; |
| 110 | struct inode *inode = NULL; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 111 | int flags, ret = -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 112 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 113 | if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { |
| 114 | pr_err("Missing fd_dev_name=\n"); |
| 115 | return -EINVAL; |
| 116 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 117 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 118 | /* |
Nicholas Bellinger | a4dff30 | 2012-05-30 16:25:41 -0700 | [diff] [blame] | 119 | * Use O_DSYNC by default instead of O_SYNC to forgo syncing |
| 120 | * of pure timestamp updates. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 121 | */ |
Nicholas Bellinger | a4dff30 | 2012-05-30 16:25:41 -0700 | [diff] [blame] | 122 | flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 123 | |
Nicholas Bellinger | b32f4c7 | 2012-09-29 17:15:37 -0700 | [diff] [blame] | 124 | /* |
| 125 | * Optionally allow fd_buffered_io=1 to be enabled for people |
| 126 | * who want use the fs buffer cache as an WriteCache mechanism. |
| 127 | * |
| 128 | * This means that in event of a hard failure, there is a risk |
| 129 | * of silent data-loss if the SCSI client has *not* performed a |
| 130 | * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE |
| 131 | * to write-out the entire device cache. |
| 132 | */ |
| 133 | if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { |
| 134 | pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); |
| 135 | flags &= ~O_DSYNC; |
| 136 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 137 | |
Al Viro | dbc6e02 | 2012-08-01 13:07:04 +0400 | [diff] [blame] | 138 | file = filp_open(fd_dev->fd_dev_name, flags, 0600); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 139 | if (IS_ERR(file)) { |
Al Viro | dbc6e02 | 2012-08-01 13:07:04 +0400 | [diff] [blame] | 140 | pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); |
Nicholas Bellinger | 613640e | 2011-03-14 04:05:59 -0700 | [diff] [blame] | 141 | ret = PTR_ERR(file); |
| 142 | goto fail; |
| 143 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 144 | fd_dev->fd_file = file; |
| 145 | /* |
| 146 | * If using a block backend with this struct file, we extract |
| 147 | * fd_dev->fd_[block,dev]_size from struct block_device. |
| 148 | * |
| 149 | * Otherwise, we use the passed fd_size= from configfs |
| 150 | */ |
| 151 | inode = file->f_mapping->host; |
| 152 | if (S_ISBLK(inode->i_mode)) { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 153 | struct request_queue *q = bdev_get_queue(inode->i_bdev); |
Nicholas Bellinger | cd9323f | 2012-05-16 16:05:26 -0700 | [diff] [blame] | 154 | unsigned long long dev_size; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 155 | |
Nicholas Bellinger | 21363ca | 2013-05-29 21:35:23 -0700 | [diff] [blame^] | 156 | fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 157 | /* |
| 158 | * Determine the number of bytes from i_size_read() minus |
| 159 | * one (1) logical sector from underlying struct block_device |
| 160 | */ |
Nicholas Bellinger | cd9323f | 2012-05-16 16:05:26 -0700 | [diff] [blame] | 161 | dev_size = (i_size_read(file->f_mapping->host) - |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 162 | fd_dev->fd_block_size); |
| 163 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 164 | pr_debug("FILEIO: Using size: %llu bytes from struct" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 165 | " block_device blocks: %llu logical_block_size: %d\n", |
Nicholas Bellinger | cd9323f | 2012-05-16 16:05:26 -0700 | [diff] [blame] | 166 | dev_size, div_u64(dev_size, fd_dev->fd_block_size), |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 167 | fd_dev->fd_block_size); |
Asias He | 70d3ae5c | 2013-02-25 14:03:42 +0800 | [diff] [blame] | 168 | /* |
| 169 | * Check if the underlying struct block_device request_queue supports |
| 170 | * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM |
| 171 | * in ATA and we need to set TPE=1 |
| 172 | */ |
| 173 | if (blk_queue_discard(q)) { |
| 174 | dev->dev_attrib.max_unmap_lba_count = |
| 175 | q->limits.max_discard_sectors; |
| 176 | /* |
| 177 | * Currently hardcoded to 1 in Linux/SCSI code.. |
| 178 | */ |
| 179 | dev->dev_attrib.max_unmap_block_desc_count = 1; |
| 180 | dev->dev_attrib.unmap_granularity = |
| 181 | q->limits.discard_granularity >> 9; |
| 182 | dev->dev_attrib.unmap_granularity_alignment = |
| 183 | q->limits.discard_alignment; |
| 184 | pr_debug("IFILE: BLOCK Discard support available," |
| 185 | " disabled by default\n"); |
| 186 | } |
| 187 | /* |
| 188 | * Enable write same emulation for IBLOCK and use 0xFFFF as |
| 189 | * the smaller WRITE_SAME(10) only has a two-byte block count. |
| 190 | */ |
| 191 | dev->dev_attrib.max_write_same_len = 0xFFFF; |
Asias He | 0463a3f | 2013-04-24 19:38:11 -0700 | [diff] [blame] | 192 | |
| 193 | if (blk_queue_nonrot(q)) |
| 194 | dev->dev_attrib.is_nonrot = 1; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 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 | |
Nicholas Bellinger | 21363ca | 2013-05-29 21:35:23 -0700 | [diff] [blame^] | 203 | fd_dev->fd_block_size = FD_BLOCKSIZE; |
Asias He | 70d3ae5c | 2013-02-25 14:03:42 +0800 | [diff] [blame] | 204 | /* |
| 205 | * Limit UNMAP emulation to 8k Number of LBAs (NoLB) |
| 206 | */ |
| 207 | dev->dev_attrib.max_unmap_lba_count = 0x2000; |
| 208 | /* |
| 209 | * Currently hardcoded to 1 in Linux/SCSI code.. |
| 210 | */ |
| 211 | dev->dev_attrib.max_unmap_block_desc_count = 1; |
| 212 | dev->dev_attrib.unmap_granularity = 1; |
| 213 | dev->dev_attrib.unmap_granularity_alignment = 0; |
| 214 | |
| 215 | /* |
| 216 | * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) |
| 217 | * based upon struct iovec limit for vfs_writev() |
| 218 | */ |
| 219 | dev->dev_attrib.max_write_same_len = 0x1000; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 220 | } |
| 221 | |
Nicholas Bellinger | 21363ca | 2013-05-29 21:35:23 -0700 | [diff] [blame^] | 222 | dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; |
Andy Grover | e3e84cd | 2013-04-26 11:09:03 -0700 | [diff] [blame] | 223 | dev->dev_attrib.hw_max_sectors = FD_MAX_SECTORS; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 224 | dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 225 | |
Nicholas Bellinger | b32f4c7 | 2012-09-29 17:15:37 -0700 | [diff] [blame] | 226 | if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { |
| 227 | pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" |
| 228 | " with FDBD_HAS_BUFFERED_IO_WCE\n"); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 229 | dev->dev_attrib.emulate_write_cache = 1; |
Nicholas Bellinger | b32f4c7 | 2012-09-29 17:15:37 -0700 | [diff] [blame] | 230 | } |
| 231 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 232 | fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; |
| 233 | fd_dev->fd_queue_depth = dev->queue_depth; |
| 234 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 235 | 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] | 236 | " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, |
| 237 | fd_dev->fd_dev_name, fd_dev->fd_dev_size); |
| 238 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 239 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 240 | fail: |
| 241 | if (fd_dev->fd_file) { |
| 242 | filp_close(fd_dev->fd_file, NULL); |
| 243 | fd_dev->fd_file = NULL; |
| 244 | } |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 245 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 246 | } |
| 247 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 248 | static void fd_free_device(struct se_device *dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 249 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 250 | struct fd_dev *fd_dev = FD_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 251 | |
| 252 | if (fd_dev->fd_file) { |
| 253 | filp_close(fd_dev->fd_file, NULL); |
| 254 | fd_dev->fd_file = NULL; |
| 255 | } |
| 256 | |
| 257 | kfree(fd_dev); |
| 258 | } |
| 259 | |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame] | 260 | static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl, |
| 261 | u32 sgl_nents, int is_write) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 262 | { |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 263 | struct se_device *se_dev = cmd->se_dev; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 264 | struct fd_dev *dev = FD_DEV(se_dev); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 265 | struct file *fd = dev->fd_file; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 266 | struct scatterlist *sg; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 267 | struct iovec *iov; |
| 268 | mm_segment_t old_fs; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 269 | 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] | 270 | int ret = 0, i; |
| 271 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 272 | iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 273 | if (!iov) { |
| 274 | pr_err("Unable to allocate fd_do_readv iov[]\n"); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 275 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 276 | } |
| 277 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 278 | for_each_sg(sgl, sg, sgl_nents, i) { |
Sebastian Andrzej Siewior | 9649fa1 | 2011-11-28 12:33:10 +0100 | [diff] [blame] | 279 | iov[i].iov_len = sg->length; |
Sebastian Andrzej Siewior | 40ff2c3 | 2012-12-05 12:08:29 +0100 | [diff] [blame] | 280 | iov[i].iov_base = kmap(sg_page(sg)) + sg->offset; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 281 | } |
| 282 | |
| 283 | old_fs = get_fs(); |
| 284 | set_fs(get_ds()); |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame] | 285 | |
| 286 | if (is_write) |
| 287 | ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); |
| 288 | else |
| 289 | ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); |
| 290 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 291 | set_fs(old_fs); |
| 292 | |
Sebastian Andrzej Siewior | 40ff2c3 | 2012-12-05 12:08:29 +0100 | [diff] [blame] | 293 | for_each_sg(sgl, sg, sgl_nents, i) |
| 294 | kunmap(sg_page(sg)); |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame] | 295 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 296 | kfree(iov); |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame] | 297 | |
| 298 | if (is_write) { |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 299 | if (ret < 0 || ret != cmd->data_length) { |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame] | 300 | pr_err("%s() write returned %d\n", __func__, ret); |
Andy Grover | e3d6f90 | 2011-07-19 08:55:10 +0000 | [diff] [blame] | 301 | return (ret < 0 ? ret : -EINVAL); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 302 | } |
| 303 | } else { |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame] | 304 | /* |
| 305 | * Return zeros and GOOD status even if the READ did not return |
| 306 | * the expected virt_size for struct file w/o a backing struct |
| 307 | * block_device. |
| 308 | */ |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 309 | if (S_ISBLK(file_inode(fd)->i_mode)) { |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame] | 310 | if (ret < 0 || ret != cmd->data_length) { |
| 311 | pr_err("%s() returned %d, expecting %u for " |
| 312 | "S_ISBLK\n", __func__, ret, |
| 313 | cmd->data_length); |
| 314 | return (ret < 0 ? ret : -EINVAL); |
| 315 | } |
| 316 | } else { |
| 317 | if (ret < 0) { |
| 318 | pr_err("%s() returned %d for non S_ISBLK\n", |
| 319 | __func__, ret); |
| 320 | return ret; |
| 321 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 322 | } |
| 323 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 324 | return 1; |
| 325 | } |
| 326 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 327 | static sense_reason_t |
| 328 | fd_execute_sync_cache(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 329 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 330 | struct se_device *dev = cmd->se_dev; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 331 | struct fd_dev *fd_dev = FD_DEV(dev); |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 332 | int immed = (cmd->t_task_cdb[1] & 0x2); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 333 | loff_t start, end; |
| 334 | int ret; |
| 335 | |
| 336 | /* |
| 337 | * If the Immediate bit is set, queue up the GOOD response |
| 338 | * for this SYNCHRONIZE_CACHE op |
| 339 | */ |
| 340 | if (immed) |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 341 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 342 | |
| 343 | /* |
| 344 | * Determine if we will be flushing the entire device. |
| 345 | */ |
Andy Grover | a1d8b49 | 2011-05-02 17:12:10 -0700 | [diff] [blame] | 346 | if (cmd->t_task_lba == 0 && cmd->data_length == 0) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 347 | start = 0; |
| 348 | end = LLONG_MAX; |
| 349 | } else { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 350 | start = cmd->t_task_lba * dev->dev_attrib.block_size; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 351 | if (cmd->data_length) |
| 352 | end = start + cmd->data_length; |
| 353 | else |
| 354 | end = LLONG_MAX; |
| 355 | } |
| 356 | |
| 357 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); |
| 358 | if (ret != 0) |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 359 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 360 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 361 | if (immed) |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 362 | return 0; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 363 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 364 | if (ret) |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 365 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 366 | else |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 367 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 368 | |
| 369 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 370 | } |
| 371 | |
Nicholas Bellinger | 7b745c8 | 2013-02-19 17:30:34 -0800 | [diff] [blame] | 372 | static unsigned char * |
| 373 | fd_setup_write_same_buf(struct se_cmd *cmd, struct scatterlist *sg, |
| 374 | unsigned int len) |
| 375 | { |
| 376 | struct se_device *se_dev = cmd->se_dev; |
| 377 | unsigned int block_size = se_dev->dev_attrib.block_size; |
| 378 | unsigned int i = 0, end; |
| 379 | unsigned char *buf, *p, *kmap_buf; |
| 380 | |
| 381 | buf = kzalloc(min_t(unsigned int, len, PAGE_SIZE), GFP_KERNEL); |
| 382 | if (!buf) { |
| 383 | pr_err("Unable to allocate fd_execute_write_same buf\n"); |
| 384 | return NULL; |
| 385 | } |
| 386 | |
| 387 | kmap_buf = kmap(sg_page(sg)) + sg->offset; |
| 388 | if (!kmap_buf) { |
| 389 | pr_err("kmap() failed in fd_setup_write_same\n"); |
| 390 | kfree(buf); |
| 391 | return NULL; |
| 392 | } |
| 393 | /* |
| 394 | * Fill local *buf to contain multiple WRITE_SAME blocks up to |
| 395 | * min(len, PAGE_SIZE) |
| 396 | */ |
| 397 | p = buf; |
| 398 | end = min_t(unsigned int, len, PAGE_SIZE); |
| 399 | |
| 400 | while (i < end) { |
| 401 | memcpy(p, kmap_buf, block_size); |
| 402 | |
| 403 | i += block_size; |
| 404 | p += block_size; |
| 405 | } |
| 406 | kunmap(sg_page(sg)); |
| 407 | |
| 408 | return buf; |
| 409 | } |
| 410 | |
| 411 | static sense_reason_t |
| 412 | fd_execute_write_same(struct se_cmd *cmd) |
| 413 | { |
| 414 | struct se_device *se_dev = cmd->se_dev; |
| 415 | struct fd_dev *fd_dev = FD_DEV(se_dev); |
| 416 | struct file *f = fd_dev->fd_file; |
| 417 | struct scatterlist *sg; |
| 418 | struct iovec *iov; |
| 419 | mm_segment_t old_fs; |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 420 | sector_t nolb = sbc_get_write_same_sectors(cmd); |
Nicholas Bellinger | 7b745c8 | 2013-02-19 17:30:34 -0800 | [diff] [blame] | 421 | loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; |
| 422 | unsigned int len, len_tmp, iov_num; |
| 423 | int i, rc; |
| 424 | unsigned char *buf; |
| 425 | |
| 426 | if (!nolb) { |
| 427 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
| 428 | return 0; |
| 429 | } |
| 430 | sg = &cmd->t_data_sg[0]; |
| 431 | |
| 432 | if (cmd->t_data_nents > 1 || |
| 433 | sg->length != cmd->se_dev->dev_attrib.block_size) { |
| 434 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" |
| 435 | " block_size: %u\n", cmd->t_data_nents, sg->length, |
| 436 | cmd->se_dev->dev_attrib.block_size); |
| 437 | return TCM_INVALID_CDB_FIELD; |
| 438 | } |
| 439 | |
| 440 | len = len_tmp = nolb * se_dev->dev_attrib.block_size; |
| 441 | iov_num = DIV_ROUND_UP(len, PAGE_SIZE); |
| 442 | |
| 443 | buf = fd_setup_write_same_buf(cmd, sg, len); |
| 444 | if (!buf) |
| 445 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 446 | |
| 447 | iov = vzalloc(sizeof(struct iovec) * iov_num); |
| 448 | if (!iov) { |
| 449 | pr_err("Unable to allocate fd_execute_write_same iovecs\n"); |
| 450 | kfree(buf); |
| 451 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 452 | } |
| 453 | /* |
| 454 | * Map the single fabric received scatterlist block now populated |
| 455 | * in *buf into each iovec for I/O submission. |
| 456 | */ |
| 457 | for (i = 0; i < iov_num; i++) { |
| 458 | iov[i].iov_base = buf; |
| 459 | iov[i].iov_len = min_t(unsigned int, len_tmp, PAGE_SIZE); |
| 460 | len_tmp -= iov[i].iov_len; |
| 461 | } |
| 462 | |
| 463 | old_fs = get_fs(); |
| 464 | set_fs(get_ds()); |
| 465 | rc = vfs_writev(f, &iov[0], iov_num, &pos); |
| 466 | set_fs(old_fs); |
| 467 | |
| 468 | vfree(iov); |
| 469 | kfree(buf); |
| 470 | |
| 471 | if (rc < 0 || rc != len) { |
| 472 | pr_err("vfs_writev() returned %d for write same\n", rc); |
| 473 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 474 | } |
| 475 | |
| 476 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
| 477 | return 0; |
| 478 | } |
| 479 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 480 | static sense_reason_t |
Asias He | 86d7182 | 2013-02-25 14:03:46 +0800 | [diff] [blame] | 481 | fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb) |
Asias He | 70d3ae5c | 2013-02-25 14:03:42 +0800 | [diff] [blame] | 482 | { |
Asias He | 86d7182 | 2013-02-25 14:03:46 +0800 | [diff] [blame] | 483 | struct file *file = priv; |
Asias He | 70d3ae5c | 2013-02-25 14:03:42 +0800 | [diff] [blame] | 484 | struct inode *inode = file->f_mapping->host; |
Asias He | 70d3ae5c | 2013-02-25 14:03:42 +0800 | [diff] [blame] | 485 | int ret; |
| 486 | |
Asias He | 70d3ae5c | 2013-02-25 14:03:42 +0800 | [diff] [blame] | 487 | if (S_ISBLK(inode->i_mode)) { |
| 488 | /* The backend is block device, use discard */ |
| 489 | struct block_device *bdev = inode->i_bdev; |
| 490 | |
Asias He | 43f55bb | 2013-02-25 14:03:44 +0800 | [diff] [blame] | 491 | ret = blkdev_issue_discard(bdev, lba, |
Asias He | 70d3ae5c | 2013-02-25 14:03:42 +0800 | [diff] [blame] | 492 | nolb, GFP_KERNEL, 0); |
| 493 | if (ret < 0) { |
| 494 | pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", |
| 495 | ret); |
| 496 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 497 | } |
| 498 | } else { |
| 499 | /* The backend is normal file, use fallocate */ |
Asias He | 43f55bb | 2013-02-25 14:03:44 +0800 | [diff] [blame] | 500 | struct se_device *se_dev = cmd->se_dev; |
| 501 | loff_t pos = lba * se_dev->dev_attrib.block_size; |
Asias He | 70d3ae5c | 2013-02-25 14:03:42 +0800 | [diff] [blame] | 502 | unsigned int len = nolb * se_dev->dev_attrib.block_size; |
| 503 | int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; |
| 504 | |
| 505 | if (!file->f_op->fallocate) |
| 506 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 507 | |
| 508 | ret = file->f_op->fallocate(file, mode, pos, len); |
| 509 | if (ret < 0) { |
| 510 | pr_warn("FILEIO: fallocate() failed: %d\n", ret); |
| 511 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 512 | } |
| 513 | } |
| 514 | |
Asias He | 43f55bb | 2013-02-25 14:03:44 +0800 | [diff] [blame] | 515 | return 0; |
| 516 | } |
| 517 | |
| 518 | static sense_reason_t |
| 519 | fd_execute_write_same_unmap(struct se_cmd *cmd) |
| 520 | { |
| 521 | struct se_device *se_dev = cmd->se_dev; |
| 522 | struct fd_dev *fd_dev = FD_DEV(se_dev); |
| 523 | struct file *file = fd_dev->fd_file; |
| 524 | sector_t lba = cmd->t_task_lba; |
| 525 | sector_t nolb = sbc_get_write_same_sectors(cmd); |
| 526 | int ret; |
| 527 | |
| 528 | if (!nolb) { |
| 529 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
| 530 | return 0; |
| 531 | } |
| 532 | |
| 533 | ret = fd_do_unmap(cmd, file, lba, nolb); |
| 534 | if (ret) |
| 535 | return ret; |
| 536 | |
Asias He | 70d3ae5c | 2013-02-25 14:03:42 +0800 | [diff] [blame] | 537 | target_complete_cmd(cmd, GOOD); |
| 538 | return 0; |
| 539 | } |
| 540 | |
| 541 | static sense_reason_t |
Asias He | 5064276 | 2013-02-25 14:03:43 +0800 | [diff] [blame] | 542 | fd_execute_unmap(struct se_cmd *cmd) |
| 543 | { |
Asias He | 86d7182 | 2013-02-25 14:03:46 +0800 | [diff] [blame] | 544 | struct file *file = FD_DEV(cmd->se_dev)->fd_file; |
Asias He | 5064276 | 2013-02-25 14:03:43 +0800 | [diff] [blame] | 545 | |
Asias He | 86d7182 | 2013-02-25 14:03:46 +0800 | [diff] [blame] | 546 | return sbc_execute_unmap(cmd, fd_do_unmap, file); |
Asias He | 5064276 | 2013-02-25 14:03:43 +0800 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | static sense_reason_t |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 550 | fd_execute_rw(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 551 | { |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 552 | struct scatterlist *sgl = cmd->t_data_sg; |
| 553 | u32 sgl_nents = cmd->t_data_nents; |
| 554 | enum dma_data_direction data_direction = cmd->data_direction; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 555 | struct se_device *dev = cmd->se_dev; |
| 556 | int ret = 0; |
| 557 | |
| 558 | /* |
| 559 | * Call vectorized fileio functions to map struct scatterlist |
| 560 | * physical memory addresses to struct iovec virtual memory. |
| 561 | */ |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 562 | if (data_direction == DMA_FROM_DEVICE) { |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame] | 563 | ret = fd_do_rw(cmd, sgl, sgl_nents, 0); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 564 | } else { |
Sebastian Andrzej Siewior | 778229a | 2012-12-05 13:09:45 -0800 | [diff] [blame] | 565 | ret = fd_do_rw(cmd, sgl, sgl_nents, 1); |
Nicholas Bellinger | a4dff30 | 2012-05-30 16:25:41 -0700 | [diff] [blame] | 566 | /* |
| 567 | * Perform implict vfs_fsync_range() for fd_do_writev() ops |
| 568 | * for SCSI WRITEs with Forced Unit Access (FUA) set. |
| 569 | * Allow this to happen independent of WCE=0 setting. |
| 570 | */ |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 571 | if (ret > 0 && |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 572 | dev->dev_attrib.emulate_fua_write > 0 && |
Christoph Hellwig | 2d3a4b5 | 2011-11-14 11:36:29 -0500 | [diff] [blame] | 573 | (cmd->se_cmd_flags & SCF_FUA)) { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 574 | struct fd_dev *fd_dev = FD_DEV(dev); |
Nicholas Bellinger | a4dff30 | 2012-05-30 16:25:41 -0700 | [diff] [blame] | 575 | loff_t start = cmd->t_task_lba * |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 576 | dev->dev_attrib.block_size; |
Nicholas Bellinger | a4dff30 | 2012-05-30 16:25:41 -0700 | [diff] [blame] | 577 | loff_t end = start + cmd->data_length; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 578 | |
Nicholas Bellinger | a4dff30 | 2012-05-30 16:25:41 -0700 | [diff] [blame] | 579 | vfs_fsync_range(fd_dev->fd_file, start, end, 1); |
| 580 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 581 | } |
| 582 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 583 | if (ret < 0) |
| 584 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 585 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 586 | if (ret) |
| 587 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 588 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 589 | } |
| 590 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 591 | enum { |
| 592 | Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err |
| 593 | }; |
| 594 | |
| 595 | static match_table_t tokens = { |
| 596 | {Opt_fd_dev_name, "fd_dev_name=%s"}, |
| 597 | {Opt_fd_dev_size, "fd_dev_size=%s"}, |
Nicholas Bellinger | b32f4c7 | 2012-09-29 17:15:37 -0700 | [diff] [blame] | 598 | {Opt_fd_buffered_io, "fd_buffered_io=%d"}, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 599 | {Opt_err, NULL} |
| 600 | }; |
| 601 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 602 | static ssize_t fd_set_configfs_dev_params(struct se_device *dev, |
| 603 | const char *page, ssize_t count) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 604 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 605 | struct fd_dev *fd_dev = FD_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 606 | char *orig, *ptr, *arg_p, *opts; |
| 607 | substring_t args[MAX_OPT_ARGS]; |
Nicholas Bellinger | b32f4c7 | 2012-09-29 17:15:37 -0700 | [diff] [blame] | 608 | int ret = 0, arg, token; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 609 | |
| 610 | opts = kstrdup(page, GFP_KERNEL); |
| 611 | if (!opts) |
| 612 | return -ENOMEM; |
| 613 | |
| 614 | orig = opts; |
| 615 | |
Sebastian Andrzej Siewior | 90c161b | 2011-11-23 20:53:17 +0100 | [diff] [blame] | 616 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 617 | if (!*ptr) |
| 618 | continue; |
| 619 | |
| 620 | token = match_token(ptr, tokens, args); |
| 621 | switch (token) { |
| 622 | case Opt_fd_dev_name: |
Al Viro | dbc6e02 | 2012-08-01 13:07:04 +0400 | [diff] [blame] | 623 | if (match_strlcpy(fd_dev->fd_dev_name, &args[0], |
| 624 | FD_MAX_DEV_NAME) == 0) { |
| 625 | ret = -EINVAL; |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 626 | break; |
| 627 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 628 | pr_debug("FILEIO: Referencing Path: %s\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 629 | fd_dev->fd_dev_name); |
| 630 | fd_dev->fbd_flags |= FBDF_HAS_PATH; |
| 631 | break; |
| 632 | case Opt_fd_dev_size: |
| 633 | arg_p = match_strdup(&args[0]); |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 634 | if (!arg_p) { |
| 635 | ret = -ENOMEM; |
| 636 | break; |
| 637 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 638 | ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); |
Jesper Juhl | 6d18025 | 2011-03-14 04:05:56 -0700 | [diff] [blame] | 639 | kfree(arg_p); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 640 | if (ret < 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 641 | pr_err("strict_strtoull() failed for" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 642 | " fd_dev_size=\n"); |
| 643 | goto out; |
| 644 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 645 | pr_debug("FILEIO: Referencing Size: %llu" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 646 | " bytes\n", fd_dev->fd_dev_size); |
| 647 | fd_dev->fbd_flags |= FBDF_HAS_SIZE; |
| 648 | break; |
Nicholas Bellinger | b32f4c7 | 2012-09-29 17:15:37 -0700 | [diff] [blame] | 649 | case Opt_fd_buffered_io: |
| 650 | match_int(args, &arg); |
| 651 | if (arg != 1) { |
| 652 | pr_err("bogus fd_buffered_io=%d value\n", arg); |
| 653 | ret = -EINVAL; |
| 654 | goto out; |
| 655 | } |
| 656 | |
| 657 | pr_debug("FILEIO: Using buffered I/O" |
| 658 | " operations for struct fd_dev\n"); |
| 659 | |
| 660 | fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; |
| 661 | break; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 662 | default: |
| 663 | break; |
| 664 | } |
| 665 | } |
| 666 | |
| 667 | out: |
| 668 | kfree(orig); |
| 669 | return (!ret) ? count : ret; |
| 670 | } |
| 671 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 672 | 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] | 673 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 674 | struct fd_dev *fd_dev = FD_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 675 | ssize_t bl = 0; |
| 676 | |
| 677 | 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] | 678 | bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", |
| 679 | fd_dev->fd_dev_name, fd_dev->fd_dev_size, |
| 680 | (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? |
| 681 | "Buffered-WCE" : "O_DSYNC"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 682 | return bl; |
| 683 | } |
| 684 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 685 | static sector_t fd_get_blocks(struct se_device *dev) |
| 686 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 687 | struct fd_dev *fd_dev = FD_DEV(dev); |
Nicholas Bellinger | cd9323f | 2012-05-16 16:05:26 -0700 | [diff] [blame] | 688 | struct file *f = fd_dev->fd_file; |
| 689 | struct inode *i = f->f_mapping->host; |
| 690 | unsigned long long dev_size; |
| 691 | /* |
| 692 | * When using a file that references an underlying struct block_device, |
| 693 | * ensure dev_size is always based on the current inode size in order |
| 694 | * to handle underlying block_device resize operations. |
| 695 | */ |
| 696 | if (S_ISBLK(i->i_mode)) |
Nicholas Bellinger | 21363ca | 2013-05-29 21:35:23 -0700 | [diff] [blame^] | 697 | dev_size = i_size_read(i); |
Nicholas Bellinger | cd9323f | 2012-05-16 16:05:26 -0700 | [diff] [blame] | 698 | else |
| 699 | dev_size = fd_dev->fd_dev_size; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 700 | |
Nicholas Bellinger | 21363ca | 2013-05-29 21:35:23 -0700 | [diff] [blame^] | 701 | return div_u64(dev_size - dev->dev_attrib.block_size, |
| 702 | dev->dev_attrib.block_size); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 703 | } |
| 704 | |
Christoph Hellwig | 9e999a6 | 2012-10-07 10:55:50 -0400 | [diff] [blame] | 705 | static struct sbc_ops fd_sbc_ops = { |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 706 | .execute_rw = fd_execute_rw, |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 707 | .execute_sync_cache = fd_execute_sync_cache, |
Nicholas Bellinger | 7b745c8 | 2013-02-19 17:30:34 -0800 | [diff] [blame] | 708 | .execute_write_same = fd_execute_write_same, |
Asias He | 70d3ae5c | 2013-02-25 14:03:42 +0800 | [diff] [blame] | 709 | .execute_write_same_unmap = fd_execute_write_same_unmap, |
Asias He | 5064276 | 2013-02-25 14:03:43 +0800 | [diff] [blame] | 710 | .execute_unmap = fd_execute_unmap, |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 711 | }; |
| 712 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 713 | static sense_reason_t |
| 714 | fd_parse_cdb(struct se_cmd *cmd) |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 715 | { |
Christoph Hellwig | 9e999a6 | 2012-10-07 10:55:50 -0400 | [diff] [blame] | 716 | return sbc_parse_cdb(cmd, &fd_sbc_ops); |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 717 | } |
| 718 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 719 | static struct se_subsystem_api fileio_template = { |
| 720 | .name = "fileio", |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 721 | .inquiry_prod = "FILEIO", |
| 722 | .inquiry_rev = FD_VERSION, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 723 | .owner = THIS_MODULE, |
| 724 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, |
| 725 | .attach_hba = fd_attach_hba, |
| 726 | .detach_hba = fd_detach_hba, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 727 | .alloc_device = fd_alloc_device, |
| 728 | .configure_device = fd_configure_device, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 729 | .free_device = fd_free_device, |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 730 | .parse_cdb = fd_parse_cdb, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 731 | .set_configfs_dev_params = fd_set_configfs_dev_params, |
| 732 | .show_configfs_dev_params = fd_show_configfs_dev_params, |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 733 | .get_device_type = sbc_get_device_type, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 734 | .get_blocks = fd_get_blocks, |
| 735 | }; |
| 736 | |
| 737 | static int __init fileio_module_init(void) |
| 738 | { |
| 739 | return transport_subsystem_register(&fileio_template); |
| 740 | } |
| 741 | |
Asias He | 63b91d5 | 2013-02-27 12:50:56 +0800 | [diff] [blame] | 742 | static void __exit fileio_module_exit(void) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 743 | { |
| 744 | transport_subsystem_release(&fileio_template); |
| 745 | } |
| 746 | |
| 747 | MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); |
| 748 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); |
| 749 | MODULE_LICENSE("GPL"); |
| 750 | |
| 751 | module_init(fileio_module_init); |
| 752 | module_exit(fileio_module_exit); |