blob: c629817a8854bea49a18c6b3f93f3f8923f99079 [file] [log] [blame]
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -08001/*******************************************************************************
2 * Filename: target_core_file.c
3 *
4 * This file contains the Storage Engine <-> FILEIO transport specific functions
5 *
Nicholas Bellinger4c762512013-09-05 15:29:12 -07006 * (c) Copyright 2005-2013 Datera, Inc.
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -08007 *
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 Bellingerc66ac9d2010-12-17 11:11:26 -080026#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 Gortmaker827509e2011-08-30 14:20:44 -040032#include <linux/module.h>
David S. Miller5538d292015-05-28 11:35:41 -070033#include <linux/vmalloc.h>
Asias He70d3ae5c2013-02-25 14:03:42 +080034#include <linux/falloc.h>
Bart Van Assche8dcf07b2016-11-14 15:47:14 -080035#include <linux/uio.h>
Bart Van Asscheba929992015-05-08 10:11:12 +020036#include <scsi/scsi_proto.h>
Asias He50642762013-02-25 14:03:43 +080037#include <asm/unaligned.h>
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080038
39#include <target/target_core_base.h>
Christoph Hellwigc4795fb2011-11-16 09:46:48 -050040#include <target/target_core_backend.h>
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080041
42#include "target_core_file.h"
43
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -040044static inline struct fd_dev *FD_DEV(struct se_device *dev)
45{
46 return container_of(dev, struct fd_dev, dev);
47}
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080048
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080049static int fd_attach_hba(struct se_hba *hba, u32 host_id)
50{
51 struct fd_host *fd_host;
52
53 fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
Andy Grover6708bb22011-06-08 10:36:43 -070054 if (!fd_host) {
55 pr_err("Unable to allocate memory for struct fd_host\n");
Andy Grovere3d6f902011-07-19 08:55:10 +000056 return -ENOMEM;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080057 }
58
59 fd_host->fd_host_id = host_id;
60
Andy Grovere3d6f902011-07-19 08:55:10 +000061 hba->hba_ptr = fd_host;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080062
Andy Grover6708bb22011-06-08 10:36:43 -070063 pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic"
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080064 " Target Core Stack %s\n", hba->hba_id, FD_VERSION,
Christoph Hellwigce8dd252015-06-19 15:14:39 +020065 TARGET_CORE_VERSION);
Nicholas Bellinger95cadac2013-12-12 12:24:11 -080066 pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n",
67 hba->hba_id, fd_host->fd_host_id);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080068
69 return 0;
70}
71
72static void fd_detach_hba(struct se_hba *hba)
73{
74 struct fd_host *fd_host = hba->hba_ptr;
75
Andy Grover6708bb22011-06-08 10:36:43 -070076 pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic"
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080077 " Target Core\n", hba->hba_id, fd_host->fd_host_id);
78
79 kfree(fd_host);
80 hba->hba_ptr = NULL;
81}
82
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -040083static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080084{
85 struct fd_dev *fd_dev;
Jörn Engel8359cf42011-11-24 02:05:51 +010086 struct fd_host *fd_host = hba->hba_ptr;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080087
88 fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
Andy Grover6708bb22011-06-08 10:36:43 -070089 if (!fd_dev) {
90 pr_err("Unable to allocate memory for struct fd_dev\n");
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080091 return NULL;
92 }
93
94 fd_dev->fd_host = fd_host;
95
Andy Grover6708bb22011-06-08 10:36:43 -070096 pr_debug("FILEIO: Allocated fd_dev for %p\n", name);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080097
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -040098 return &fd_dev->dev;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080099}
100
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400101static int fd_configure_device(struct se_device *dev)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800102{
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400103 struct fd_dev *fd_dev = FD_DEV(dev);
104 struct fd_host *fd_host = dev->se_hba->hba_ptr;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800105 struct file *file;
106 struct inode *inode = NULL;
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400107 int flags, ret = -EINVAL;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800108
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400109 if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
110 pr_err("Missing fd_dev_name=\n");
111 return -EINVAL;
112 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800113
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800114 /*
Nicholas Bellingera4dff302012-05-30 16:25:41 -0700115 * Use O_DSYNC by default instead of O_SYNC to forgo syncing
116 * of pure timestamp updates.
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800117 */
Nicholas Bellingera4dff302012-05-30 16:25:41 -0700118 flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400119
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700120 /*
121 * Optionally allow fd_buffered_io=1 to be enabled for people
122 * who want use the fs buffer cache as an WriteCache mechanism.
123 *
124 * This means that in event of a hard failure, there is a risk
125 * of silent data-loss if the SCSI client has *not* performed a
126 * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE
127 * to write-out the entire device cache.
128 */
129 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
130 pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n");
131 flags &= ~O_DSYNC;
132 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800133
Al Virodbc6e022012-08-01 13:07:04 +0400134 file = filp_open(fd_dev->fd_dev_name, flags, 0600);
Nicholas Bellinger613640e2011-03-14 04:05:59 -0700135 if (IS_ERR(file)) {
Al Virodbc6e022012-08-01 13:07:04 +0400136 pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name);
Nicholas Bellinger613640e2011-03-14 04:05:59 -0700137 ret = PTR_ERR(file);
138 goto fail;
139 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800140 fd_dev->fd_file = file;
141 /*
142 * If using a block backend with this struct file, we extract
143 * fd_dev->fd_[block,dev]_size from struct block_device.
144 *
145 * Otherwise, we use the passed fd_size= from configfs
146 */
147 inode = file->f_mapping->host;
148 if (S_ISBLK(inode->i_mode)) {
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400149 struct request_queue *q = bdev_get_queue(inode->i_bdev);
Nicholas Bellingercd9323f2012-05-16 16:05:26 -0700150 unsigned long long dev_size;
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400151
Nicholas Bellinger21363ca2013-05-29 21:35:23 -0700152 fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800153 /*
154 * Determine the number of bytes from i_size_read() minus
155 * one (1) logical sector from underlying struct block_device
156 */
Nicholas Bellingercd9323f2012-05-16 16:05:26 -0700157 dev_size = (i_size_read(file->f_mapping->host) -
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800158 fd_dev->fd_block_size);
159
Andy Grover6708bb22011-06-08 10:36:43 -0700160 pr_debug("FILEIO: Using size: %llu bytes from struct"
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800161 " block_device blocks: %llu logical_block_size: %d\n",
Nicholas Bellingercd9323f2012-05-16 16:05:26 -0700162 dev_size, div_u64(dev_size, fd_dev->fd_block_size),
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800163 fd_dev->fd_block_size);
Mike Christie8a9ebe72016-01-18 14:09:27 -0600164
Mike Christieea263c72016-06-02 20:12:37 -0500165 if (target_configure_unmap_from_queue(&dev->dev_attrib, q))
Asias He70d3ae5c2013-02-25 14:03:42 +0800166 pr_debug("IFILE: BLOCK Discard support available,"
Mike Christie8a9ebe72016-01-18 14:09:27 -0600167 " disabled by default\n");
Asias He70d3ae5c2013-02-25 14:03:42 +0800168 /*
169 * Enable write same emulation for IBLOCK and use 0xFFFF as
170 * the smaller WRITE_SAME(10) only has a two-byte block count.
171 */
172 dev->dev_attrib.max_write_same_len = 0xFFFF;
Asias He0463a3f2013-04-24 19:38:11 -0700173
174 if (blk_queue_nonrot(q))
175 dev->dev_attrib.is_nonrot = 1;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800176 } else {
177 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
Andy Grover6708bb22011-06-08 10:36:43 -0700178 pr_err("FILEIO: Missing fd_dev_size="
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800179 " parameter, and no backing struct"
180 " block_device\n");
181 goto fail;
182 }
183
Nicholas Bellinger21363ca2013-05-29 21:35:23 -0700184 fd_dev->fd_block_size = FD_BLOCKSIZE;
Asias He70d3ae5c2013-02-25 14:03:42 +0800185 /*
186 * Limit UNMAP emulation to 8k Number of LBAs (NoLB)
187 */
188 dev->dev_attrib.max_unmap_lba_count = 0x2000;
189 /*
190 * Currently hardcoded to 1 in Linux/SCSI code..
191 */
192 dev->dev_attrib.max_unmap_block_desc_count = 1;
193 dev->dev_attrib.unmap_granularity = 1;
194 dev->dev_attrib.unmap_granularity_alignment = 0;
195
196 /*
197 * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB)
198 * based upon struct iovec limit for vfs_writev()
199 */
200 dev->dev_attrib.max_write_same_len = 0x1000;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800201 }
202
Nicholas Bellinger21363ca2013-05-29 21:35:23 -0700203 dev->dev_attrib.hw_block_size = fd_dev->fd_block_size;
Nicholas Bellinger95cadac2013-12-12 12:24:11 -0800204 dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES;
205 dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size;
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400206 dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800207
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700208 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
209 pr_debug("FILEIO: Forcing setting of emulate_write_cache=1"
210 " with FDBD_HAS_BUFFERED_IO_WCE\n");
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400211 dev->dev_attrib.emulate_write_cache = 1;
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700212 }
213
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800214 fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
215 fd_dev->fd_queue_depth = dev->queue_depth;
216
Andy Grover6708bb22011-06-08 10:36:43 -0700217 pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800218 " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
219 fd_dev->fd_dev_name, fd_dev->fd_dev_size);
220
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400221 return 0;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800222fail:
223 if (fd_dev->fd_file) {
224 filp_close(fd_dev->fd_file, NULL);
225 fd_dev->fd_file = NULL;
226 }
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400227 return ret;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800228}
229
Nicholas Bellinger4cc987e2015-05-19 00:03:07 -0700230static void fd_dev_call_rcu(struct rcu_head *p)
231{
232 struct se_device *dev = container_of(p, struct se_device, rcu_head);
233 struct fd_dev *fd_dev = FD_DEV(dev);
234
235 kfree(fd_dev);
236}
237
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400238static void fd_free_device(struct se_device *dev)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800239{
Mike Christie92634702017-06-23 01:18:12 -0500240 call_rcu(&dev->rcu_head, fd_dev_call_rcu);
241}
242
243static void fd_destroy_device(struct se_device *dev)
244{
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400245 struct fd_dev *fd_dev = FD_DEV(dev);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800246
247 if (fd_dev->fd_file) {
248 filp_close(fd_dev->fd_file, NULL);
249 fd_dev->fd_file = NULL;
250 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800251}
252
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300253static int fd_do_rw(struct se_cmd *cmd, struct file *fd,
254 u32 block_size, struct scatterlist *sgl,
255 u32 sgl_nents, u32 data_length, int is_write)
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000256{
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400257 struct scatterlist *sg;
Christoph Hellwig6b9a44d2015-02-22 08:48:41 -0800258 struct iov_iter iter;
259 struct bio_vec *bvec;
260 ssize_t len = 0;
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300261 loff_t pos = (cmd->t_task_lba * block_size);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800262 int ret = 0, i;
263
Christoph Hellwig6b9a44d2015-02-22 08:48:41 -0800264 bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
265 if (!bvec) {
Andy Grover6708bb22011-06-08 10:36:43 -0700266 pr_err("Unable to allocate fd_do_readv iov[]\n");
Andy Grovere3d6f902011-07-19 08:55:10 +0000267 return -ENOMEM;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800268 }
269
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400270 for_each_sg(sgl, sg, sgl_nents, i) {
Christoph Hellwig6b9a44d2015-02-22 08:48:41 -0800271 bvec[i].bv_page = sg_page(sg);
272 bvec[i].bv_len = sg->length;
273 bvec[i].bv_offset = sg->offset;
274
275 len += sg->length;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800276 }
277
Christoph Hellwig6b9a44d2015-02-22 08:48:41 -0800278 iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len);
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800279 if (is_write)
Christoph Hellwigabbb65892017-05-27 11:16:52 +0300280 ret = vfs_iter_write(fd, &iter, &pos, 0);
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800281 else
Christoph Hellwig18e97102017-05-27 11:16:51 +0300282 ret = vfs_iter_read(fd, &iter, &pos, 0);
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800283
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800284 if (is_write) {
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300285 if (ret < 0 || ret != data_length) {
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800286 pr_err("%s() write returned %d\n", __func__, ret);
Dmitry Monakhovf11b55d2017-03-31 19:53:35 +0400287 if (ret >= 0)
288 ret = -EINVAL;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800289 }
290 } else {
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800291 /*
292 * Return zeros and GOOD status even if the READ did not return
293 * the expected virt_size for struct file w/o a backing struct
294 * block_device.
295 */
Al Viro496ad9a2013-01-23 17:07:38 -0500296 if (S_ISBLK(file_inode(fd)->i_mode)) {
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300297 if (ret < 0 || ret != data_length) {
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800298 pr_err("%s() returned %d, expecting %u for "
299 "S_ISBLK\n", __func__, ret,
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300300 data_length);
Dmitry Monakhovf11b55d2017-03-31 19:53:35 +0400301 if (ret >= 0)
302 ret = -EINVAL;
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800303 }
304 } else {
305 if (ret < 0) {
306 pr_err("%s() returned %d for non S_ISBLK\n",
307 __func__, ret);
Dmitry Monakhovf11b55d2017-03-31 19:53:35 +0400308 } else if (ret != data_length) {
309 /*
310 * Short read case:
311 * Probably some one truncate file under us.
312 * We must explicitly zero sg-pages to prevent
313 * expose uninizialized pages to userspace.
314 */
315 if (ret < data_length)
316 ret += iov_iter_zero(data_length - ret, &iter);
317 else
318 ret = -EINVAL;
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800319 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800320 }
321 }
Dmitry Monakhovf11b55d2017-03-31 19:53:35 +0400322 kfree(bvec);
323 return ret;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800324}
325
Christoph Hellwigde103c92012-11-06 12:24:09 -0800326static sense_reason_t
327fd_execute_sync_cache(struct se_cmd *cmd)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800328{
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800329 struct se_device *dev = cmd->se_dev;
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400330 struct fd_dev *fd_dev = FD_DEV(dev);
Andy Grovera1d8b492011-05-02 17:12:10 -0700331 int immed = (cmd->t_task_cdb[1] & 0x2);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800332 loff_t start, end;
333 int ret;
334
335 /*
336 * If the Immediate bit is set, queue up the GOOD response
337 * for this SYNCHRONIZE_CACHE op
338 */
339 if (immed)
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400340 target_complete_cmd(cmd, SAM_STAT_GOOD);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800341
342 /*
343 * Determine if we will be flushing the entire device.
344 */
Andy Grovera1d8b492011-05-02 17:12:10 -0700345 if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800346 start = 0;
347 end = LLONG_MAX;
348 } else {
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400349 start = cmd->t_task_lba * dev->dev_attrib.block_size;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800350 if (cmd->data_length)
Zach Brown62d3ab42014-10-06 16:40:13 -0700351 end = start + cmd->data_length - 1;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800352 else
353 end = LLONG_MAX;
354 }
355
356 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
357 if (ret != 0)
Andy Grover6708bb22011-06-08 10:36:43 -0700358 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800359
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400360 if (immed)
Christoph Hellwigad67f0d2012-06-17 18:40:53 -0400361 return 0;
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400362
Christoph Hellwigde103c92012-11-06 12:24:09 -0800363 if (ret)
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400364 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
Christoph Hellwigde103c92012-11-06 12:24:09 -0800365 else
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400366 target_complete_cmd(cmd, SAM_STAT_GOOD);
Christoph Hellwigad67f0d2012-06-17 18:40:53 -0400367
368 return 0;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800369}
370
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800371static sense_reason_t
372fd_execute_write_same(struct se_cmd *cmd)
373{
374 struct se_device *se_dev = cmd->se_dev;
375 struct fd_dev *fd_dev = FD_DEV(se_dev);
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800376 loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
Christoph Hellwigd4c5dca2015-02-22 08:48:42 -0800377 sector_t nolb = sbc_get_write_same_sectors(cmd);
378 struct iov_iter iter;
379 struct bio_vec *bvec;
380 unsigned int len = 0, i;
381 ssize_t ret;
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800382
383 if (!nolb) {
384 target_complete_cmd(cmd, SAM_STAT_GOOD);
385 return 0;
386 }
Nicholas Bellingerafd73f12015-02-14 01:32:11 +0000387 if (cmd->prot_op) {
388 pr_err("WRITE_SAME: Protection information with FILEIO"
389 " backends not supported\n");
390 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
391 }
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800392
393 if (cmd->t_data_nents > 1 ||
Christoph Hellwigd4c5dca2015-02-22 08:48:42 -0800394 cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) {
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800395 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
Christoph Hellwigd4c5dca2015-02-22 08:48:42 -0800396 " block_size: %u\n",
397 cmd->t_data_nents,
398 cmd->t_data_sg[0].length,
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800399 cmd->se_dev->dev_attrib.block_size);
400 return TCM_INVALID_CDB_FIELD;
401 }
402
Christoph Hellwigd4c5dca2015-02-22 08:48:42 -0800403 bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL);
404 if (!bvec)
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800405 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
406
Christoph Hellwigd4c5dca2015-02-22 08:48:42 -0800407 for (i = 0; i < nolb; i++) {
408 bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]);
409 bvec[i].bv_len = cmd->t_data_sg[0].length;
410 bvec[i].bv_offset = cmd->t_data_sg[0].offset;
411
412 len += se_dev->dev_attrib.block_size;
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800413 }
414
Christoph Hellwigd4c5dca2015-02-22 08:48:42 -0800415 iov_iter_bvec(&iter, ITER_BVEC, bvec, nolb, len);
Christoph Hellwigabbb65892017-05-27 11:16:52 +0300416 ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos, 0);
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800417
Christoph Hellwigd4c5dca2015-02-22 08:48:42 -0800418 kfree(bvec);
419 if (ret < 0 || ret != len) {
420 pr_err("vfs_iter_write() returned %zd for write same\n", ret);
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800421 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
422 }
423
424 target_complete_cmd(cmd, SAM_STAT_GOOD);
425 return 0;
426}
427
Akinobu Mita64d240b2015-04-13 23:21:58 +0900428static int
429fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb,
430 void *buf, size_t bufsize)
431{
432 struct fd_dev *fd_dev = FD_DEV(se_dev);
433 struct file *prot_fd = fd_dev->fd_prot_file;
434 sector_t prot_length, prot;
435 loff_t pos = lba * se_dev->prot_length;
436
437 if (!prot_fd) {
438 pr_err("Unable to locate fd_dev->fd_prot_file\n");
439 return -ENODEV;
440 }
441
442 prot_length = nolb * se_dev->prot_length;
443
444 for (prot = 0; prot < prot_length;) {
445 sector_t len = min_t(sector_t, bufsize, prot_length - prot);
Christoph Hellwige13ec932017-09-01 17:39:14 +0200446 ssize_t ret = kernel_write(prot_fd, buf, len, &pos);
Akinobu Mita64d240b2015-04-13 23:21:58 +0900447
448 if (ret != len) {
449 pr_err("vfs_write to prot file failed: %zd\n", ret);
450 return ret < 0 ? ret : -ENODEV;
451 }
452 prot += ret;
453 }
454
455 return 0;
456}
457
458static int
459fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
460{
461 void *buf;
462 int rc;
463
464 buf = (void *)__get_free_page(GFP_KERNEL);
465 if (!buf) {
466 pr_err("Unable to allocate FILEIO prot buf\n");
467 return -ENOMEM;
468 }
469 memset(buf, 0xff, PAGE_SIZE);
470
471 rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE);
472
473 free_page((unsigned long)buf);
474
475 return rc;
476}
477
Christoph Hellwigde103c92012-11-06 12:24:09 -0800478static sense_reason_t
Christoph Hellwig62e46942015-06-19 15:10:59 +0200479fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
Asias He70d3ae5c2013-02-25 14:03:42 +0800480{
Christoph Hellwig62e46942015-06-19 15:10:59 +0200481 struct file *file = FD_DEV(cmd->se_dev)->fd_file;
Asias He70d3ae5c2013-02-25 14:03:42 +0800482 struct inode *inode = file->f_mapping->host;
Asias He70d3ae5c2013-02-25 14:03:42 +0800483 int ret;
484
Akinobu Mita64d240b2015-04-13 23:21:58 +0900485 if (cmd->se_dev->dev_attrib.pi_prot_type) {
486 ret = fd_do_prot_unmap(cmd, lba, nolb);
487 if (ret)
488 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
489 }
490
Asias He70d3ae5c2013-02-25 14:03:42 +0800491 if (S_ISBLK(inode->i_mode)) {
492 /* The backend is block device, use discard */
493 struct block_device *bdev = inode->i_bdev;
Mike Christie8a9ebe72016-01-18 14:09:27 -0600494 struct se_device *dev = cmd->se_dev;
Asias He70d3ae5c2013-02-25 14:03:42 +0800495
Mike Christie8a9ebe72016-01-18 14:09:27 -0600496 ret = blkdev_issue_discard(bdev,
497 target_to_linux_sector(dev, lba),
498 target_to_linux_sector(dev, nolb),
499 GFP_KERNEL, 0);
Asias He70d3ae5c2013-02-25 14:03:42 +0800500 if (ret < 0) {
501 pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n",
502 ret);
503 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
504 }
505 } else {
506 /* The backend is normal file, use fallocate */
Asias He43f55bb2013-02-25 14:03:44 +0800507 struct se_device *se_dev = cmd->se_dev;
508 loff_t pos = lba * se_dev->dev_attrib.block_size;
Asias He70d3ae5c2013-02-25 14:03:42 +0800509 unsigned int len = nolb * se_dev->dev_attrib.block_size;
510 int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
511
512 if (!file->f_op->fallocate)
513 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
514
515 ret = file->f_op->fallocate(file, mode, pos, len);
516 if (ret < 0) {
517 pr_warn("FILEIO: fallocate() failed: %d\n", ret);
518 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
519 }
520 }
521
Asias He43f55bb2013-02-25 14:03:44 +0800522 return 0;
523}
524
525static sense_reason_t
Nicholas Bellingera82a9532013-08-19 23:57:30 -0700526fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
527 enum dma_data_direction data_direction)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800528{
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800529 struct se_device *dev = cmd->se_dev;
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300530 struct fd_dev *fd_dev = FD_DEV(dev);
531 struct file *file = fd_dev->fd_file;
532 struct file *pfile = fd_dev->fd_prot_file;
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000533 sense_reason_t rc;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800534 int ret = 0;
Nicholas Bellinger046ba642015-01-06 16:10:37 -0800535 /*
536 * We are currently limited by the number of iovecs (2048) per
537 * single vfs_[writev,readv] call.
538 */
539 if (cmd->data_length > FD_MAX_BYTES) {
540 pr_err("FILEIO: Not able to process I/O of %u bytes due to"
Colin Ian King291e3e52016-06-22 19:31:51 +0100541 "FD_MAX_BYTES: %u iovec count limitation\n",
Nicholas Bellinger046ba642015-01-06 16:10:37 -0800542 cmd->data_length, FD_MAX_BYTES);
543 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
544 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800545 /*
546 * Call vectorized fileio functions to map struct scatterlist
547 * physical memory addresses to struct iovec virtual memory.
548 */
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400549 if (data_direction == DMA_FROM_DEVICE) {
Nicholas Bellingeree920462015-02-28 02:44:19 -0800550 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300551 ret = fd_do_rw(cmd, pfile, dev->prot_length,
552 cmd->t_prot_sg, cmd->t_prot_nents,
553 cmd->prot_length, 0);
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000554 if (ret < 0)
555 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
556 }
557
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300558 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
559 sgl, sgl_nents, cmd->data_length, 0);
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000560
Dmitry Monakhov056e8922017-03-31 19:53:36 +0400561 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type &&
562 dev->dev_attrib.pi_prot_verify) {
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300563 u32 sectors = cmd->data_length >>
564 ilog2(dev->dev_attrib.block_size);
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000565
Sagi Grimbergf75b6fa2015-04-19 20:27:19 +0300566 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
567 0, cmd->t_prot_sg, 0);
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300568 if (rc)
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000569 return rc;
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000570 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800571 } else {
Dmitry Monakhov056e8922017-03-31 19:53:36 +0400572 if (cmd->prot_type && dev->dev_attrib.pi_prot_type &&
573 dev->dev_attrib.pi_prot_verify) {
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300574 u32 sectors = cmd->data_length >>
575 ilog2(dev->dev_attrib.block_size);
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000576
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300577 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
578 0, cmd->t_prot_sg, 0);
579 if (rc)
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000580 return rc;
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000581 }
582
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300583 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
584 sgl, sgl_nents, cmd->data_length, 1);
Nicholas Bellingera4dff302012-05-30 16:25:41 -0700585 /*
Hannes Reinecke125d0112013-11-19 09:07:46 +0100586 * Perform implicit vfs_fsync_range() for fd_do_writev() ops
Nicholas Bellingera4dff302012-05-30 16:25:41 -0700587 * for SCSI WRITEs with Forced Unit Access (FUA) set.
588 * Allow this to happen independent of WCE=0 setting.
589 */
Christoph Hellwig814e5b42015-04-20 15:00:30 +0200590 if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) {
Nicholas Bellingera4dff302012-05-30 16:25:41 -0700591 loff_t start = cmd->t_task_lba *
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400592 dev->dev_attrib.block_size;
Zach Brown62d3ab42014-10-06 16:40:13 -0700593 loff_t end;
594
595 if (cmd->data_length)
596 end = start + cmd->data_length - 1;
597 else
598 end = LLONG_MAX;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800599
Nicholas Bellingera4dff302012-05-30 16:25:41 -0700600 vfs_fsync_range(fd_dev->fd_file, start, end, 1);
601 }
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000602
Nicholas Bellingeree920462015-02-28 02:44:19 -0800603 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300604 ret = fd_do_rw(cmd, pfile, dev->prot_length,
605 cmd->t_prot_sg, cmd->t_prot_nents,
606 cmd->prot_length, 1);
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000607 if (ret < 0)
608 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
609 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800610 }
611
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300612 if (ret < 0)
Christoph Hellwigde103c92012-11-06 12:24:09 -0800613 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
614
Bart Van Assche59ac9c02017-05-04 15:50:47 -0700615 target_complete_cmd(cmd, SAM_STAT_GOOD);
Nicholas Bellinger03e98c92011-11-04 02:36:16 -0700616 return 0;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800617}
618
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800619enum {
620 Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
621};
622
623static match_table_t tokens = {
624 {Opt_fd_dev_name, "fd_dev_name=%s"},
625 {Opt_fd_dev_size, "fd_dev_size=%s"},
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700626 {Opt_fd_buffered_io, "fd_buffered_io=%d"},
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800627 {Opt_err, NULL}
628};
629
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400630static ssize_t fd_set_configfs_dev_params(struct se_device *dev,
631 const char *page, ssize_t count)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800632{
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400633 struct fd_dev *fd_dev = FD_DEV(dev);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800634 char *orig, *ptr, *arg_p, *opts;
635 substring_t args[MAX_OPT_ARGS];
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700636 int ret = 0, arg, token;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800637
638 opts = kstrdup(page, GFP_KERNEL);
639 if (!opts)
640 return -ENOMEM;
641
642 orig = opts;
643
Sebastian Andrzej Siewior90c161b2011-11-23 20:53:17 +0100644 while ((ptr = strsep(&opts, ",\n")) != NULL) {
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800645 if (!*ptr)
646 continue;
647
648 token = match_token(ptr, tokens, args);
649 switch (token) {
650 case Opt_fd_dev_name:
Al Virodbc6e022012-08-01 13:07:04 +0400651 if (match_strlcpy(fd_dev->fd_dev_name, &args[0],
652 FD_MAX_DEV_NAME) == 0) {
653 ret = -EINVAL;
Jesper Juhl6d180252011-03-14 04:05:56 -0700654 break;
655 }
Andy Grover6708bb22011-06-08 10:36:43 -0700656 pr_debug("FILEIO: Referencing Path: %s\n",
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800657 fd_dev->fd_dev_name);
658 fd_dev->fbd_flags |= FBDF_HAS_PATH;
659 break;
660 case Opt_fd_dev_size:
661 arg_p = match_strdup(&args[0]);
Jesper Juhl6d180252011-03-14 04:05:56 -0700662 if (!arg_p) {
663 ret = -ENOMEM;
664 break;
665 }
Jingoo Han57103d72013-07-19 16:22:19 +0900666 ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size);
Jesper Juhl6d180252011-03-14 04:05:56 -0700667 kfree(arg_p);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800668 if (ret < 0) {
Jingoo Han57103d72013-07-19 16:22:19 +0900669 pr_err("kstrtoull() failed for"
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800670 " fd_dev_size=\n");
671 goto out;
672 }
Andy Grover6708bb22011-06-08 10:36:43 -0700673 pr_debug("FILEIO: Referencing Size: %llu"
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800674 " bytes\n", fd_dev->fd_dev_size);
675 fd_dev->fbd_flags |= FBDF_HAS_SIZE;
676 break;
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700677 case Opt_fd_buffered_io:
Joern Engelce31c1b2014-09-02 17:50:00 -0400678 ret = match_int(args, &arg);
679 if (ret)
680 goto out;
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700681 if (arg != 1) {
682 pr_err("bogus fd_buffered_io=%d value\n", arg);
683 ret = -EINVAL;
684 goto out;
685 }
686
687 pr_debug("FILEIO: Using buffered I/O"
688 " operations for struct fd_dev\n");
689
690 fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
691 break;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800692 default:
693 break;
694 }
695 }
696
697out:
698 kfree(orig);
699 return (!ret) ? count : ret;
700}
701
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400702static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800703{
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400704 struct fd_dev *fd_dev = FD_DEV(dev);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800705 ssize_t bl = 0;
706
707 bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700708 bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n",
709 fd_dev->fd_dev_name, fd_dev->fd_dev_size,
710 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ?
711 "Buffered-WCE" : "O_DSYNC");
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800712 return bl;
713}
714
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800715static sector_t fd_get_blocks(struct se_device *dev)
716{
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400717 struct fd_dev *fd_dev = FD_DEV(dev);
Nicholas Bellingercd9323f2012-05-16 16:05:26 -0700718 struct file *f = fd_dev->fd_file;
719 struct inode *i = f->f_mapping->host;
720 unsigned long long dev_size;
721 /*
722 * When using a file that references an underlying struct block_device,
723 * ensure dev_size is always based on the current inode size in order
724 * to handle underlying block_device resize operations.
725 */
726 if (S_ISBLK(i->i_mode))
Nicholas Bellinger21363ca2013-05-29 21:35:23 -0700727 dev_size = i_size_read(i);
Nicholas Bellingercd9323f2012-05-16 16:05:26 -0700728 else
729 dev_size = fd_dev->fd_dev_size;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800730
Nicholas Bellinger21363ca2013-05-29 21:35:23 -0700731 return div_u64(dev_size - dev->dev_attrib.block_size,
732 dev->dev_attrib.block_size);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800733}
734
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000735static int fd_init_prot(struct se_device *dev)
736{
737 struct fd_dev *fd_dev = FD_DEV(dev);
738 struct file *prot_file, *file = fd_dev->fd_file;
739 struct inode *inode;
740 int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
741 char buf[FD_MAX_DEV_PROT_NAME];
742
743 if (!file) {
744 pr_err("Unable to locate fd_dev->fd_file\n");
745 return -ENODEV;
746 }
747
748 inode = file->f_mapping->host;
749 if (S_ISBLK(inode->i_mode)) {
750 pr_err("FILEIO Protection emulation only supported on"
751 " !S_ISBLK\n");
752 return -ENOSYS;
753 }
754
755 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE)
756 flags &= ~O_DSYNC;
757
758 snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection",
759 fd_dev->fd_dev_name);
760
761 prot_file = filp_open(buf, flags, 0600);
762 if (IS_ERR(prot_file)) {
763 pr_err("filp_open(%s) failed\n", buf);
764 ret = PTR_ERR(prot_file);
765 return ret;
766 }
767 fd_dev->fd_prot_file = prot_file;
768
769 return 0;
770}
771
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000772static int fd_format_prot(struct se_device *dev)
773{
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000774 unsigned char *buf;
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000775 int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size;
Akinobu Mita64d240b2015-04-13 23:21:58 +0900776 int ret;
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000777
778 if (!dev->dev_attrib.pi_prot_type) {
779 pr_err("Unable to format_prot while pi_prot_type == 0\n");
780 return -ENODEV;
781 }
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000782
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000783 buf = vzalloc(unit_size);
784 if (!buf) {
785 pr_err("Unable to allocate FILEIO prot buf\n");
786 return -ENOMEM;
787 }
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000788
789 pr_debug("Using FILEIO prot_length: %llu\n",
Akinobu Mita64d240b2015-04-13 23:21:58 +0900790 (unsigned long long)(dev->transport->get_blocks(dev) + 1) *
791 dev->prot_length);
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000792
Sagi Grimberg80dcd0c2014-02-19 17:50:16 +0200793 memset(buf, 0xff, unit_size);
Akinobu Mita64d240b2015-04-13 23:21:58 +0900794 ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1,
795 buf, unit_size);
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000796 vfree(buf);
797 return ret;
798}
799
800static void fd_free_prot(struct se_device *dev)
801{
802 struct fd_dev *fd_dev = FD_DEV(dev);
803
804 if (!fd_dev->fd_prot_file)
805 return;
806
807 filp_close(fd_dev->fd_prot_file, NULL);
808 fd_dev->fd_prot_file = NULL;
809}
810
Christoph Hellwig9e999a62012-10-07 10:55:50 -0400811static struct sbc_ops fd_sbc_ops = {
Christoph Hellwig0c2ad7d2012-06-17 18:40:52 -0400812 .execute_rw = fd_execute_rw,
Christoph Hellwigad67f0d2012-06-17 18:40:53 -0400813 .execute_sync_cache = fd_execute_sync_cache,
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800814 .execute_write_same = fd_execute_write_same,
Asias He50642762013-02-25 14:03:43 +0800815 .execute_unmap = fd_execute_unmap,
Christoph Hellwig0c2ad7d2012-06-17 18:40:52 -0400816};
817
Christoph Hellwigde103c92012-11-06 12:24:09 -0800818static sense_reason_t
819fd_parse_cdb(struct se_cmd *cmd)
Christoph Hellwig0c2ad7d2012-06-17 18:40:52 -0400820{
Christoph Hellwig9e999a62012-10-07 10:55:50 -0400821 return sbc_parse_cdb(cmd, &fd_sbc_ops);
Christoph Hellwig0c2ad7d2012-06-17 18:40:52 -0400822}
823
Christoph Hellwig0a06d432015-05-10 18:14:56 +0200824static const struct target_backend_ops fileio_ops = {
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800825 .name = "fileio",
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400826 .inquiry_prod = "FILEIO",
827 .inquiry_rev = FD_VERSION,
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800828 .owner = THIS_MODULE,
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800829 .attach_hba = fd_attach_hba,
830 .detach_hba = fd_detach_hba,
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400831 .alloc_device = fd_alloc_device,
832 .configure_device = fd_configure_device,
Mike Christie92634702017-06-23 01:18:12 -0500833 .destroy_device = fd_destroy_device,
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800834 .free_device = fd_free_device,
Christoph Hellwig0c2ad7d2012-06-17 18:40:52 -0400835 .parse_cdb = fd_parse_cdb,
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800836 .set_configfs_dev_params = fd_set_configfs_dev_params,
837 .show_configfs_dev_params = fd_show_configfs_dev_params,
Christoph Hellwig6f23ac82012-10-07 10:55:53 -0400838 .get_device_type = sbc_get_device_type,
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800839 .get_blocks = fd_get_blocks,
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000840 .init_prot = fd_init_prot,
841 .format_prot = fd_format_prot,
842 .free_prot = fd_free_prot,
Christoph Hellwig5873c4d2015-05-10 18:14:57 +0200843 .tb_dev_attrib_attrs = sbc_attrib_attrs,
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800844};
845
846static int __init fileio_module_init(void)
847{
Christoph Hellwig0a06d432015-05-10 18:14:56 +0200848 return transport_backend_register(&fileio_ops);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800849}
850
Asias He63b91d52013-02-27 12:50:56 +0800851static void __exit fileio_module_exit(void)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800852{
Christoph Hellwig0a06d432015-05-10 18:14:56 +0200853 target_backend_unregister(&fileio_ops);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800854}
855
856MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
857MODULE_AUTHOR("nab@Linux-iSCSI.org");
858MODULE_LICENSE("GPL");
859
860module_init(fileio_module_init);
861module_exit(fileio_module_exit);