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Thomas Gleixner1a59d1b82019-05-27 08:55:05 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -08002/*******************************************************************************
3 * Filename: target_core_file.c
4 *
5 * This file contains the Storage Engine <-> FILEIO transport specific functions
6 *
Nicholas Bellinger4c762512013-09-05 15:29:12 -07007 * (c) Copyright 2005-2013 Datera, Inc.
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -08008 *
9 * Nicholas A. Bellinger <nab@kernel.org>
10 *
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080011 ******************************************************************************/
12
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080013#include <linux/string.h>
14#include <linux/parser.h>
15#include <linux/timer.h>
16#include <linux/blkdev.h>
17#include <linux/slab.h>
18#include <linux/spinlock.h>
Paul Gortmaker827509e2011-08-30 14:20:44 -040019#include <linux/module.h>
David S. Miller5538d292015-05-28 11:35:41 -070020#include <linux/vmalloc.h>
Asias He70d3ae5c2013-02-25 14:03:42 +080021#include <linux/falloc.h>
Bart Van Assche8dcf07b2016-11-14 15:47:14 -080022#include <linux/uio.h>
Bart Van Asscheba929992015-05-08 10:11:12 +020023#include <scsi/scsi_proto.h>
Asias He50642762013-02-25 14:03:43 +080024#include <asm/unaligned.h>
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080025
26#include <target/target_core_base.h>
Christoph Hellwigc4795fb2011-11-16 09:46:48 -050027#include <target/target_core_backend.h>
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080028
29#include "target_core_file.h"
30
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -040031static inline struct fd_dev *FD_DEV(struct se_device *dev)
32{
33 return container_of(dev, struct fd_dev, dev);
34}
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080035
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080036static int fd_attach_hba(struct se_hba *hba, u32 host_id)
37{
38 struct fd_host *fd_host;
39
40 fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
Andy Grover6708bb22011-06-08 10:36:43 -070041 if (!fd_host) {
42 pr_err("Unable to allocate memory for struct fd_host\n");
Andy Grovere3d6f902011-07-19 08:55:10 +000043 return -ENOMEM;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080044 }
45
46 fd_host->fd_host_id = host_id;
47
Andy Grovere3d6f902011-07-19 08:55:10 +000048 hba->hba_ptr = fd_host;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080049
Andy Grover6708bb22011-06-08 10:36:43 -070050 pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic"
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080051 " Target Core Stack %s\n", hba->hba_id, FD_VERSION,
Christoph Hellwigce8dd252015-06-19 15:14:39 +020052 TARGET_CORE_VERSION);
Nicholas Bellinger95cadac2013-12-12 12:24:11 -080053 pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n",
54 hba->hba_id, fd_host->fd_host_id);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080055
56 return 0;
57}
58
59static void fd_detach_hba(struct se_hba *hba)
60{
61 struct fd_host *fd_host = hba->hba_ptr;
62
Andy Grover6708bb22011-06-08 10:36:43 -070063 pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic"
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080064 " Target Core\n", hba->hba_id, fd_host->fd_host_id);
65
66 kfree(fd_host);
67 hba->hba_ptr = NULL;
68}
69
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -040070static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080071{
72 struct fd_dev *fd_dev;
Jörn Engel8359cf42011-11-24 02:05:51 +010073 struct fd_host *fd_host = hba->hba_ptr;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080074
75 fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
Andy Grover6708bb22011-06-08 10:36:43 -070076 if (!fd_dev) {
77 pr_err("Unable to allocate memory for struct fd_dev\n");
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080078 return NULL;
79 }
80
81 fd_dev->fd_host = fd_host;
82
Andy Grover6708bb22011-06-08 10:36:43 -070083 pr_debug("FILEIO: Allocated fd_dev for %p\n", name);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080084
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -040085 return &fd_dev->dev;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080086}
87
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -040088static int fd_configure_device(struct se_device *dev)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080089{
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -040090 struct fd_dev *fd_dev = FD_DEV(dev);
91 struct fd_host *fd_host = dev->se_hba->hba_ptr;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080092 struct file *file;
93 struct inode *inode = NULL;
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -040094 int flags, ret = -EINVAL;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -080095
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -040096 if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
97 pr_err("Missing fd_dev_name=\n");
98 return -EINVAL;
99 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800100
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800101 /*
Nicholas Bellingera4dff302012-05-30 16:25:41 -0700102 * Use O_DSYNC by default instead of O_SYNC to forgo syncing
103 * of pure timestamp updates.
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800104 */
Nicholas Bellingera4dff302012-05-30 16:25:41 -0700105 flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400106
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700107 /*
108 * Optionally allow fd_buffered_io=1 to be enabled for people
109 * who want use the fs buffer cache as an WriteCache mechanism.
110 *
111 * This means that in event of a hard failure, there is a risk
112 * of silent data-loss if the SCSI client has *not* performed a
113 * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE
114 * to write-out the entire device cache.
115 */
116 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
117 pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n");
118 flags &= ~O_DSYNC;
119 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800120
Al Virodbc6e022012-08-01 13:07:04 +0400121 file = filp_open(fd_dev->fd_dev_name, flags, 0600);
Nicholas Bellinger613640e2011-03-14 04:05:59 -0700122 if (IS_ERR(file)) {
Al Virodbc6e022012-08-01 13:07:04 +0400123 pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name);
Nicholas Bellinger613640e2011-03-14 04:05:59 -0700124 ret = PTR_ERR(file);
125 goto fail;
126 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800127 fd_dev->fd_file = file;
128 /*
129 * If using a block backend with this struct file, we extract
130 * fd_dev->fd_[block,dev]_size from struct block_device.
131 *
132 * Otherwise, we use the passed fd_size= from configfs
133 */
134 inode = file->f_mapping->host;
135 if (S_ISBLK(inode->i_mode)) {
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400136 struct request_queue *q = bdev_get_queue(inode->i_bdev);
Nicholas Bellingercd9323f2012-05-16 16:05:26 -0700137 unsigned long long dev_size;
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400138
Nicholas Bellinger21363ca2013-05-29 21:35:23 -0700139 fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800140 /*
141 * Determine the number of bytes from i_size_read() minus
142 * one (1) logical sector from underlying struct block_device
143 */
Nicholas Bellingercd9323f2012-05-16 16:05:26 -0700144 dev_size = (i_size_read(file->f_mapping->host) -
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800145 fd_dev->fd_block_size);
146
Andy Grover6708bb22011-06-08 10:36:43 -0700147 pr_debug("FILEIO: Using size: %llu bytes from struct"
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800148 " block_device blocks: %llu logical_block_size: %d\n",
Nicholas Bellingercd9323f2012-05-16 16:05:26 -0700149 dev_size, div_u64(dev_size, fd_dev->fd_block_size),
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800150 fd_dev->fd_block_size);
Mike Christie8a9ebe72016-01-18 14:09:27 -0600151
Mike Christieea263c72016-06-02 20:12:37 -0500152 if (target_configure_unmap_from_queue(&dev->dev_attrib, q))
Asias He70d3ae5c2013-02-25 14:03:42 +0800153 pr_debug("IFILE: BLOCK Discard support available,"
Mike Christie8a9ebe72016-01-18 14:09:27 -0600154 " disabled by default\n");
Asias He70d3ae5c2013-02-25 14:03:42 +0800155 /*
156 * Enable write same emulation for IBLOCK and use 0xFFFF as
157 * the smaller WRITE_SAME(10) only has a two-byte block count.
158 */
159 dev->dev_attrib.max_write_same_len = 0xFFFF;
Asias He0463a3f2013-04-24 19:38:11 -0700160
161 if (blk_queue_nonrot(q))
162 dev->dev_attrib.is_nonrot = 1;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800163 } else {
164 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
Andy Grover6708bb22011-06-08 10:36:43 -0700165 pr_err("FILEIO: Missing fd_dev_size="
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800166 " parameter, and no backing struct"
167 " block_device\n");
168 goto fail;
169 }
170
Nicholas Bellinger21363ca2013-05-29 21:35:23 -0700171 fd_dev->fd_block_size = FD_BLOCKSIZE;
Asias He70d3ae5c2013-02-25 14:03:42 +0800172 /*
173 * Limit UNMAP emulation to 8k Number of LBAs (NoLB)
174 */
175 dev->dev_attrib.max_unmap_lba_count = 0x2000;
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 = 1;
181 dev->dev_attrib.unmap_granularity_alignment = 0;
182
183 /*
184 * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB)
185 * based upon struct iovec limit for vfs_writev()
186 */
187 dev->dev_attrib.max_write_same_len = 0x1000;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800188 }
189
Nicholas Bellinger21363ca2013-05-29 21:35:23 -0700190 dev->dev_attrib.hw_block_size = fd_dev->fd_block_size;
Nicholas Bellinger95cadac2013-12-12 12:24:11 -0800191 dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES;
192 dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size;
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400193 dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800194
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700195 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
196 pr_debug("FILEIO: Forcing setting of emulate_write_cache=1"
197 " with FDBD_HAS_BUFFERED_IO_WCE\n");
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400198 dev->dev_attrib.emulate_write_cache = 1;
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700199 }
200
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800201 fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
202 fd_dev->fd_queue_depth = dev->queue_depth;
203
Andy Grover6708bb22011-06-08 10:36:43 -0700204 pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800205 " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
206 fd_dev->fd_dev_name, fd_dev->fd_dev_size);
207
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400208 return 0;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800209fail:
210 if (fd_dev->fd_file) {
211 filp_close(fd_dev->fd_file, NULL);
212 fd_dev->fd_file = NULL;
213 }
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400214 return ret;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800215}
216
Nicholas Bellinger4cc987e2015-05-19 00:03:07 -0700217static void fd_dev_call_rcu(struct rcu_head *p)
218{
219 struct se_device *dev = container_of(p, struct se_device, rcu_head);
220 struct fd_dev *fd_dev = FD_DEV(dev);
221
222 kfree(fd_dev);
223}
224
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400225static void fd_free_device(struct se_device *dev)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800226{
Mike Christie92634702017-06-23 01:18:12 -0500227 call_rcu(&dev->rcu_head, fd_dev_call_rcu);
228}
229
230static void fd_destroy_device(struct se_device *dev)
231{
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400232 struct fd_dev *fd_dev = FD_DEV(dev);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800233
234 if (fd_dev->fd_file) {
235 filp_close(fd_dev->fd_file, NULL);
236 fd_dev->fd_file = NULL;
237 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800238}
239
Andrei Vagin769031c2018-03-21 23:55:02 -0700240struct target_core_file_cmd {
241 unsigned long len;
242 struct se_cmd *cmd;
243 struct kiocb iocb;
244};
245
246static void cmd_rw_aio_complete(struct kiocb *iocb, long ret, long ret2)
247{
248 struct target_core_file_cmd *cmd;
249
250 cmd = container_of(iocb, struct target_core_file_cmd, iocb);
251
252 if (ret != cmd->len)
253 target_complete_cmd(cmd->cmd, SAM_STAT_CHECK_CONDITION);
254 else
255 target_complete_cmd(cmd->cmd, SAM_STAT_GOOD);
256
257 kfree(cmd);
258}
259
260static sense_reason_t
261fd_execute_rw_aio(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
262 enum dma_data_direction data_direction)
263{
264 int is_write = !(data_direction == DMA_FROM_DEVICE);
265 struct se_device *dev = cmd->se_dev;
266 struct fd_dev *fd_dev = FD_DEV(dev);
267 struct file *file = fd_dev->fd_file;
268 struct target_core_file_cmd *aio_cmd;
269 struct iov_iter iter = {};
270 struct scatterlist *sg;
271 struct bio_vec *bvec;
272 ssize_t len = 0;
273 int ret = 0, i;
274
275 aio_cmd = kmalloc(sizeof(struct target_core_file_cmd), GFP_KERNEL);
276 if (!aio_cmd)
277 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
278
279 bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
280 if (!bvec) {
281 kfree(aio_cmd);
282 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
283 }
284
285 for_each_sg(sgl, sg, sgl_nents, i) {
286 bvec[i].bv_page = sg_page(sg);
287 bvec[i].bv_len = sg->length;
288 bvec[i].bv_offset = sg->offset;
289
290 len += sg->length;
291 }
292
David Howellsaa563d72018-10-20 00:57:56 +0100293 iov_iter_bvec(&iter, is_write, bvec, sgl_nents, len);
Andrei Vagin769031c2018-03-21 23:55:02 -0700294
295 aio_cmd->cmd = cmd;
296 aio_cmd->len = len;
297 aio_cmd->iocb.ki_pos = cmd->t_task_lba * dev->dev_attrib.block_size;
298 aio_cmd->iocb.ki_filp = file;
299 aio_cmd->iocb.ki_complete = cmd_rw_aio_complete;
300 aio_cmd->iocb.ki_flags = IOCB_DIRECT;
301
302 if (is_write && (cmd->se_cmd_flags & SCF_FUA))
303 aio_cmd->iocb.ki_flags |= IOCB_DSYNC;
304
305 if (is_write)
306 ret = call_write_iter(file, &aio_cmd->iocb, &iter);
307 else
308 ret = call_read_iter(file, &aio_cmd->iocb, &iter);
309
310 kfree(bvec);
311
312 if (ret != -EIOCBQUEUED)
313 cmd_rw_aio_complete(&aio_cmd->iocb, ret, 0);
314
315 return 0;
316}
317
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300318static int fd_do_rw(struct se_cmd *cmd, struct file *fd,
319 u32 block_size, struct scatterlist *sgl,
320 u32 sgl_nents, u32 data_length, int is_write)
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000321{
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400322 struct scatterlist *sg;
Christoph Hellwig6b9a44d2015-02-22 08:48:41 -0800323 struct iov_iter iter;
324 struct bio_vec *bvec;
325 ssize_t len = 0;
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300326 loff_t pos = (cmd->t_task_lba * block_size);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800327 int ret = 0, i;
328
Christoph Hellwig6b9a44d2015-02-22 08:48:41 -0800329 bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
330 if (!bvec) {
Andy Grover6708bb22011-06-08 10:36:43 -0700331 pr_err("Unable to allocate fd_do_readv iov[]\n");
Andy Grovere3d6f902011-07-19 08:55:10 +0000332 return -ENOMEM;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800333 }
334
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400335 for_each_sg(sgl, sg, sgl_nents, i) {
Christoph Hellwig6b9a44d2015-02-22 08:48:41 -0800336 bvec[i].bv_page = sg_page(sg);
337 bvec[i].bv_len = sg->length;
338 bvec[i].bv_offset = sg->offset;
339
340 len += sg->length;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800341 }
342
David Howellsaa563d72018-10-20 00:57:56 +0100343 iov_iter_bvec(&iter, READ, bvec, sgl_nents, len);
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800344 if (is_write)
Christoph Hellwigabbb65892017-05-27 11:16:52 +0300345 ret = vfs_iter_write(fd, &iter, &pos, 0);
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800346 else
Christoph Hellwig18e97102017-05-27 11:16:51 +0300347 ret = vfs_iter_read(fd, &iter, &pos, 0);
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800348
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800349 if (is_write) {
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300350 if (ret < 0 || ret != data_length) {
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800351 pr_err("%s() write returned %d\n", __func__, ret);
Dmitry Monakhovf11b55d2017-03-31 19:53:35 +0400352 if (ret >= 0)
353 ret = -EINVAL;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800354 }
355 } else {
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800356 /*
357 * Return zeros and GOOD status even if the READ did not return
358 * the expected virt_size for struct file w/o a backing struct
359 * block_device.
360 */
Al Viro496ad9a2013-01-23 17:07:38 -0500361 if (S_ISBLK(file_inode(fd)->i_mode)) {
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300362 if (ret < 0 || ret != data_length) {
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800363 pr_err("%s() returned %d, expecting %u for "
364 "S_ISBLK\n", __func__, ret,
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300365 data_length);
Dmitry Monakhovf11b55d2017-03-31 19:53:35 +0400366 if (ret >= 0)
367 ret = -EINVAL;
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800368 }
369 } else {
370 if (ret < 0) {
371 pr_err("%s() returned %d for non S_ISBLK\n",
372 __func__, ret);
Dmitry Monakhovf11b55d2017-03-31 19:53:35 +0400373 } else if (ret != data_length) {
374 /*
375 * Short read case:
376 * Probably some one truncate file under us.
377 * We must explicitly zero sg-pages to prevent
378 * expose uninizialized pages to userspace.
379 */
380 if (ret < data_length)
381 ret += iov_iter_zero(data_length - ret, &iter);
382 else
383 ret = -EINVAL;
Sebastian Andrzej Siewior778229a2012-12-05 13:09:45 -0800384 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800385 }
386 }
Dmitry Monakhovf11b55d2017-03-31 19:53:35 +0400387 kfree(bvec);
388 return ret;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800389}
390
Christoph Hellwigde103c92012-11-06 12:24:09 -0800391static sense_reason_t
392fd_execute_sync_cache(struct se_cmd *cmd)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800393{
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800394 struct se_device *dev = cmd->se_dev;
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400395 struct fd_dev *fd_dev = FD_DEV(dev);
Andy Grovera1d8b492011-05-02 17:12:10 -0700396 int immed = (cmd->t_task_cdb[1] & 0x2);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800397 loff_t start, end;
398 int ret;
399
400 /*
401 * If the Immediate bit is set, queue up the GOOD response
402 * for this SYNCHRONIZE_CACHE op
403 */
404 if (immed)
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400405 target_complete_cmd(cmd, SAM_STAT_GOOD);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800406
407 /*
408 * Determine if we will be flushing the entire device.
409 */
Andy Grovera1d8b492011-05-02 17:12:10 -0700410 if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800411 start = 0;
412 end = LLONG_MAX;
413 } else {
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400414 start = cmd->t_task_lba * dev->dev_attrib.block_size;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800415 if (cmd->data_length)
Zach Brown62d3ab42014-10-06 16:40:13 -0700416 end = start + cmd->data_length - 1;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800417 else
418 end = LLONG_MAX;
419 }
420
421 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
422 if (ret != 0)
Andy Grover6708bb22011-06-08 10:36:43 -0700423 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800424
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400425 if (immed)
Christoph Hellwigad67f0d2012-06-17 18:40:53 -0400426 return 0;
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400427
Christoph Hellwigde103c92012-11-06 12:24:09 -0800428 if (ret)
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400429 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
Christoph Hellwigde103c92012-11-06 12:24:09 -0800430 else
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400431 target_complete_cmd(cmd, SAM_STAT_GOOD);
Christoph Hellwigad67f0d2012-06-17 18:40:53 -0400432
433 return 0;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800434}
435
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800436static sense_reason_t
437fd_execute_write_same(struct se_cmd *cmd)
438{
439 struct se_device *se_dev = cmd->se_dev;
440 struct fd_dev *fd_dev = FD_DEV(se_dev);
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800441 loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
Christoph Hellwigd4c5dca2015-02-22 08:48:42 -0800442 sector_t nolb = sbc_get_write_same_sectors(cmd);
443 struct iov_iter iter;
444 struct bio_vec *bvec;
445 unsigned int len = 0, i;
446 ssize_t ret;
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800447
448 if (!nolb) {
449 target_complete_cmd(cmd, SAM_STAT_GOOD);
450 return 0;
451 }
Nicholas Bellingerafd73f12015-02-14 01:32:11 +0000452 if (cmd->prot_op) {
453 pr_err("WRITE_SAME: Protection information with FILEIO"
454 " backends not supported\n");
455 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
456 }
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800457
458 if (cmd->t_data_nents > 1 ||
Christoph Hellwigd4c5dca2015-02-22 08:48:42 -0800459 cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) {
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800460 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
Christoph Hellwigd4c5dca2015-02-22 08:48:42 -0800461 " block_size: %u\n",
462 cmd->t_data_nents,
463 cmd->t_data_sg[0].length,
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800464 cmd->se_dev->dev_attrib.block_size);
465 return TCM_INVALID_CDB_FIELD;
466 }
467
Christoph Hellwigd4c5dca2015-02-22 08:48:42 -0800468 bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL);
469 if (!bvec)
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800470 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
471
Christoph Hellwigd4c5dca2015-02-22 08:48:42 -0800472 for (i = 0; i < nolb; i++) {
473 bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]);
474 bvec[i].bv_len = cmd->t_data_sg[0].length;
475 bvec[i].bv_offset = cmd->t_data_sg[0].offset;
476
477 len += se_dev->dev_attrib.block_size;
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800478 }
479
David Howellsaa563d72018-10-20 00:57:56 +0100480 iov_iter_bvec(&iter, READ, bvec, nolb, len);
Christoph Hellwigabbb65892017-05-27 11:16:52 +0300481 ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos, 0);
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800482
Christoph Hellwigd4c5dca2015-02-22 08:48:42 -0800483 kfree(bvec);
484 if (ret < 0 || ret != len) {
485 pr_err("vfs_iter_write() returned %zd for write same\n", ret);
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800486 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
487 }
488
489 target_complete_cmd(cmd, SAM_STAT_GOOD);
490 return 0;
491}
492
Akinobu Mita64d240b2015-04-13 23:21:58 +0900493static int
494fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb,
495 void *buf, size_t bufsize)
496{
497 struct fd_dev *fd_dev = FD_DEV(se_dev);
498 struct file *prot_fd = fd_dev->fd_prot_file;
499 sector_t prot_length, prot;
500 loff_t pos = lba * se_dev->prot_length;
501
502 if (!prot_fd) {
503 pr_err("Unable to locate fd_dev->fd_prot_file\n");
504 return -ENODEV;
505 }
506
507 prot_length = nolb * se_dev->prot_length;
508
509 for (prot = 0; prot < prot_length;) {
510 sector_t len = min_t(sector_t, bufsize, prot_length - prot);
Christoph Hellwige13ec932017-09-01 17:39:14 +0200511 ssize_t ret = kernel_write(prot_fd, buf, len, &pos);
Akinobu Mita64d240b2015-04-13 23:21:58 +0900512
513 if (ret != len) {
514 pr_err("vfs_write to prot file failed: %zd\n", ret);
515 return ret < 0 ? ret : -ENODEV;
516 }
517 prot += ret;
518 }
519
520 return 0;
521}
522
523static int
524fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
525{
526 void *buf;
527 int rc;
528
529 buf = (void *)__get_free_page(GFP_KERNEL);
530 if (!buf) {
531 pr_err("Unable to allocate FILEIO prot buf\n");
532 return -ENOMEM;
533 }
534 memset(buf, 0xff, PAGE_SIZE);
535
536 rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE);
537
538 free_page((unsigned long)buf);
539
540 return rc;
541}
542
Christoph Hellwigde103c92012-11-06 12:24:09 -0800543static sense_reason_t
Christoph Hellwig62e46942015-06-19 15:10:59 +0200544fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
Asias He70d3ae5c2013-02-25 14:03:42 +0800545{
Christoph Hellwig62e46942015-06-19 15:10:59 +0200546 struct file *file = FD_DEV(cmd->se_dev)->fd_file;
Asias He70d3ae5c2013-02-25 14:03:42 +0800547 struct inode *inode = file->f_mapping->host;
Asias He70d3ae5c2013-02-25 14:03:42 +0800548 int ret;
549
Jiang Yi594e25e2017-08-11 11:29:44 +0800550 if (!nolb) {
551 return 0;
552 }
553
Akinobu Mita64d240b2015-04-13 23:21:58 +0900554 if (cmd->se_dev->dev_attrib.pi_prot_type) {
555 ret = fd_do_prot_unmap(cmd, lba, nolb);
556 if (ret)
557 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
558 }
559
Asias He70d3ae5c2013-02-25 14:03:42 +0800560 if (S_ISBLK(inode->i_mode)) {
561 /* The backend is block device, use discard */
562 struct block_device *bdev = inode->i_bdev;
Mike Christie8a9ebe72016-01-18 14:09:27 -0600563 struct se_device *dev = cmd->se_dev;
Asias He70d3ae5c2013-02-25 14:03:42 +0800564
Mike Christie8a9ebe72016-01-18 14:09:27 -0600565 ret = blkdev_issue_discard(bdev,
566 target_to_linux_sector(dev, lba),
567 target_to_linux_sector(dev, nolb),
568 GFP_KERNEL, 0);
Asias He70d3ae5c2013-02-25 14:03:42 +0800569 if (ret < 0) {
570 pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n",
571 ret);
572 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
573 }
574 } else {
575 /* The backend is normal file, use fallocate */
Asias He43f55bb2013-02-25 14:03:44 +0800576 struct se_device *se_dev = cmd->se_dev;
577 loff_t pos = lba * se_dev->dev_attrib.block_size;
Asias He70d3ae5c2013-02-25 14:03:42 +0800578 unsigned int len = nolb * se_dev->dev_attrib.block_size;
579 int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
580
581 if (!file->f_op->fallocate)
582 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
583
584 ret = file->f_op->fallocate(file, mode, pos, len);
585 if (ret < 0) {
586 pr_warn("FILEIO: fallocate() failed: %d\n", ret);
587 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
588 }
589 }
590
Asias He43f55bb2013-02-25 14:03:44 +0800591 return 0;
592}
593
594static sense_reason_t
Andrei Vagin769031c2018-03-21 23:55:02 -0700595fd_execute_rw_buffered(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
Nicholas Bellingera82a9532013-08-19 23:57:30 -0700596 enum dma_data_direction data_direction)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800597{
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800598 struct se_device *dev = cmd->se_dev;
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300599 struct fd_dev *fd_dev = FD_DEV(dev);
600 struct file *file = fd_dev->fd_file;
601 struct file *pfile = fd_dev->fd_prot_file;
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000602 sense_reason_t rc;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800603 int ret = 0;
Nicholas Bellinger046ba642015-01-06 16:10:37 -0800604 /*
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800605 * Call vectorized fileio functions to map struct scatterlist
606 * physical memory addresses to struct iovec virtual memory.
607 */
Christoph Hellwig5787cac2012-04-24 00:25:06 -0400608 if (data_direction == DMA_FROM_DEVICE) {
Nicholas Bellingeree920462015-02-28 02:44:19 -0800609 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300610 ret = fd_do_rw(cmd, pfile, dev->prot_length,
611 cmd->t_prot_sg, cmd->t_prot_nents,
612 cmd->prot_length, 0);
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000613 if (ret < 0)
614 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
615 }
616
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300617 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
618 sgl, sgl_nents, cmd->data_length, 0);
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000619
Dmitry Monakhov056e8922017-03-31 19:53:36 +0400620 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type &&
621 dev->dev_attrib.pi_prot_verify) {
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300622 u32 sectors = cmd->data_length >>
623 ilog2(dev->dev_attrib.block_size);
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000624
Sagi Grimbergf75b6fa2015-04-19 20:27:19 +0300625 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
626 0, cmd->t_prot_sg, 0);
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300627 if (rc)
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000628 return rc;
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000629 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800630 } else {
Dmitry Monakhov056e8922017-03-31 19:53:36 +0400631 if (cmd->prot_type && dev->dev_attrib.pi_prot_type &&
632 dev->dev_attrib.pi_prot_verify) {
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300633 u32 sectors = cmd->data_length >>
634 ilog2(dev->dev_attrib.block_size);
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000635
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300636 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
637 0, cmd->t_prot_sg, 0);
638 if (rc)
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000639 return rc;
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000640 }
641
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300642 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
643 sgl, sgl_nents, cmd->data_length, 1);
Nicholas Bellingera4dff302012-05-30 16:25:41 -0700644 /*
Hannes Reinecke125d0112013-11-19 09:07:46 +0100645 * Perform implicit vfs_fsync_range() for fd_do_writev() ops
Nicholas Bellingera4dff302012-05-30 16:25:41 -0700646 * for SCSI WRITEs with Forced Unit Access (FUA) set.
647 * Allow this to happen independent of WCE=0 setting.
648 */
Christoph Hellwig814e5b42015-04-20 15:00:30 +0200649 if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) {
Nicholas Bellingera4dff302012-05-30 16:25:41 -0700650 loff_t start = cmd->t_task_lba *
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400651 dev->dev_attrib.block_size;
Zach Brown62d3ab42014-10-06 16:40:13 -0700652 loff_t end;
653
654 if (cmd->data_length)
655 end = start + cmd->data_length - 1;
656 else
657 end = LLONG_MAX;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800658
Nicholas Bellingera4dff302012-05-30 16:25:41 -0700659 vfs_fsync_range(fd_dev->fd_file, start, end, 1);
660 }
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000661
Nicholas Bellingeree920462015-02-28 02:44:19 -0800662 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300663 ret = fd_do_rw(cmd, pfile, dev->prot_length,
664 cmd->t_prot_sg, cmd->t_prot_nents,
665 cmd->prot_length, 1);
Nicholas Bellinger42201b52014-01-18 09:33:48 +0000666 if (ret < 0)
667 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
668 }
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800669 }
670
Sagi Grimberg8287fa52015-04-19 20:27:20 +0300671 if (ret < 0)
Christoph Hellwigde103c92012-11-06 12:24:09 -0800672 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
673
Bart Van Assche59ac9c02017-05-04 15:50:47 -0700674 target_complete_cmd(cmd, SAM_STAT_GOOD);
Nicholas Bellinger03e98c92011-11-04 02:36:16 -0700675 return 0;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800676}
677
Andrei Vagin769031c2018-03-21 23:55:02 -0700678static sense_reason_t
679fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
680 enum dma_data_direction data_direction)
681{
682 struct se_device *dev = cmd->se_dev;
683 struct fd_dev *fd_dev = FD_DEV(dev);
684
685 /*
686 * We are currently limited by the number of iovecs (2048) per
687 * single vfs_[writev,readv] call.
688 */
689 if (cmd->data_length > FD_MAX_BYTES) {
690 pr_err("FILEIO: Not able to process I/O of %u bytes due to"
691 "FD_MAX_BYTES: %u iovec count limitation\n",
692 cmd->data_length, FD_MAX_BYTES);
693 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
694 }
695
696 if (fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO)
697 return fd_execute_rw_aio(cmd, sgl, sgl_nents, data_direction);
698 return fd_execute_rw_buffered(cmd, sgl, sgl_nents, data_direction);
699}
700
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800701enum {
Andrei Vagin769031c2018-03-21 23:55:02 -0700702 Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io,
703 Opt_fd_async_io, Opt_err
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800704};
705
706static match_table_t tokens = {
707 {Opt_fd_dev_name, "fd_dev_name=%s"},
708 {Opt_fd_dev_size, "fd_dev_size=%s"},
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700709 {Opt_fd_buffered_io, "fd_buffered_io=%d"},
Andrei Vagin769031c2018-03-21 23:55:02 -0700710 {Opt_fd_async_io, "fd_async_io=%d"},
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800711 {Opt_err, NULL}
712};
713
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400714static ssize_t fd_set_configfs_dev_params(struct se_device *dev,
715 const char *page, ssize_t count)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800716{
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400717 struct fd_dev *fd_dev = FD_DEV(dev);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800718 char *orig, *ptr, *arg_p, *opts;
719 substring_t args[MAX_OPT_ARGS];
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700720 int ret = 0, arg, token;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800721
722 opts = kstrdup(page, GFP_KERNEL);
723 if (!opts)
724 return -ENOMEM;
725
726 orig = opts;
727
Sebastian Andrzej Siewior90c161b2011-11-23 20:53:17 +0100728 while ((ptr = strsep(&opts, ",\n")) != NULL) {
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800729 if (!*ptr)
730 continue;
731
732 token = match_token(ptr, tokens, args);
733 switch (token) {
734 case Opt_fd_dev_name:
Al Virodbc6e022012-08-01 13:07:04 +0400735 if (match_strlcpy(fd_dev->fd_dev_name, &args[0],
736 FD_MAX_DEV_NAME) == 0) {
737 ret = -EINVAL;
Jesper Juhl6d180252011-03-14 04:05:56 -0700738 break;
739 }
Andy Grover6708bb22011-06-08 10:36:43 -0700740 pr_debug("FILEIO: Referencing Path: %s\n",
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800741 fd_dev->fd_dev_name);
742 fd_dev->fbd_flags |= FBDF_HAS_PATH;
743 break;
744 case Opt_fd_dev_size:
745 arg_p = match_strdup(&args[0]);
Jesper Juhl6d180252011-03-14 04:05:56 -0700746 if (!arg_p) {
747 ret = -ENOMEM;
748 break;
749 }
Jingoo Han57103d72013-07-19 16:22:19 +0900750 ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size);
Jesper Juhl6d180252011-03-14 04:05:56 -0700751 kfree(arg_p);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800752 if (ret < 0) {
Jingoo Han57103d72013-07-19 16:22:19 +0900753 pr_err("kstrtoull() failed for"
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800754 " fd_dev_size=\n");
755 goto out;
756 }
Andy Grover6708bb22011-06-08 10:36:43 -0700757 pr_debug("FILEIO: Referencing Size: %llu"
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800758 " bytes\n", fd_dev->fd_dev_size);
759 fd_dev->fbd_flags |= FBDF_HAS_SIZE;
760 break;
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700761 case Opt_fd_buffered_io:
Joern Engelce31c1b2014-09-02 17:50:00 -0400762 ret = match_int(args, &arg);
763 if (ret)
764 goto out;
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700765 if (arg != 1) {
766 pr_err("bogus fd_buffered_io=%d value\n", arg);
767 ret = -EINVAL;
768 goto out;
769 }
770
771 pr_debug("FILEIO: Using buffered I/O"
772 " operations for struct fd_dev\n");
773
774 fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
775 break;
Andrei Vagin769031c2018-03-21 23:55:02 -0700776 case Opt_fd_async_io:
777 ret = match_int(args, &arg);
778 if (ret)
779 goto out;
780 if (arg != 1) {
781 pr_err("bogus fd_async_io=%d value\n", arg);
782 ret = -EINVAL;
783 goto out;
784 }
785
786 pr_debug("FILEIO: Using async I/O"
787 " operations for struct fd_dev\n");
788
789 fd_dev->fbd_flags |= FDBD_HAS_ASYNC_IO;
790 break;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800791 default:
792 break;
793 }
794 }
795
796out:
797 kfree(orig);
798 return (!ret) ? count : ret;
799}
800
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400801static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800802{
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400803 struct fd_dev *fd_dev = FD_DEV(dev);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800804 ssize_t bl = 0;
805
806 bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
Andrei Vagin769031c2018-03-21 23:55:02 -0700807 bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s Async: %d\n",
Nicholas Bellingerb32f4c72012-09-29 17:15:37 -0700808 fd_dev->fd_dev_name, fd_dev->fd_dev_size,
809 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ?
Andrei Vagin769031c2018-03-21 23:55:02 -0700810 "Buffered-WCE" : "O_DSYNC",
811 !!(fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO));
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800812 return bl;
813}
814
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800815static sector_t fd_get_blocks(struct se_device *dev)
816{
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400817 struct fd_dev *fd_dev = FD_DEV(dev);
Nicholas Bellingercd9323f2012-05-16 16:05:26 -0700818 struct file *f = fd_dev->fd_file;
819 struct inode *i = f->f_mapping->host;
820 unsigned long long dev_size;
821 /*
822 * When using a file that references an underlying struct block_device,
823 * ensure dev_size is always based on the current inode size in order
824 * to handle underlying block_device resize operations.
825 */
826 if (S_ISBLK(i->i_mode))
Nicholas Bellinger21363ca2013-05-29 21:35:23 -0700827 dev_size = i_size_read(i);
Nicholas Bellingercd9323f2012-05-16 16:05:26 -0700828 else
829 dev_size = fd_dev->fd_dev_size;
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800830
Nicholas Bellinger21363ca2013-05-29 21:35:23 -0700831 return div_u64(dev_size - dev->dev_attrib.block_size,
832 dev->dev_attrib.block_size);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800833}
834
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000835static int fd_init_prot(struct se_device *dev)
836{
837 struct fd_dev *fd_dev = FD_DEV(dev);
838 struct file *prot_file, *file = fd_dev->fd_file;
839 struct inode *inode;
840 int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
841 char buf[FD_MAX_DEV_PROT_NAME];
842
843 if (!file) {
844 pr_err("Unable to locate fd_dev->fd_file\n");
845 return -ENODEV;
846 }
847
848 inode = file->f_mapping->host;
849 if (S_ISBLK(inode->i_mode)) {
850 pr_err("FILEIO Protection emulation only supported on"
851 " !S_ISBLK\n");
852 return -ENOSYS;
853 }
854
855 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE)
856 flags &= ~O_DSYNC;
857
858 snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection",
859 fd_dev->fd_dev_name);
860
861 prot_file = filp_open(buf, flags, 0600);
862 if (IS_ERR(prot_file)) {
863 pr_err("filp_open(%s) failed\n", buf);
864 ret = PTR_ERR(prot_file);
865 return ret;
866 }
867 fd_dev->fd_prot_file = prot_file;
868
869 return 0;
870}
871
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000872static int fd_format_prot(struct se_device *dev)
873{
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000874 unsigned char *buf;
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000875 int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size;
Akinobu Mita64d240b2015-04-13 23:21:58 +0900876 int ret;
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000877
878 if (!dev->dev_attrib.pi_prot_type) {
879 pr_err("Unable to format_prot while pi_prot_type == 0\n");
880 return -ENODEV;
881 }
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000882
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000883 buf = vzalloc(unit_size);
884 if (!buf) {
885 pr_err("Unable to allocate FILEIO prot buf\n");
886 return -ENOMEM;
887 }
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000888
889 pr_debug("Using FILEIO prot_length: %llu\n",
Akinobu Mita64d240b2015-04-13 23:21:58 +0900890 (unsigned long long)(dev->transport->get_blocks(dev) + 1) *
891 dev->prot_length);
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000892
Sagi Grimberg80dcd0c2014-02-19 17:50:16 +0200893 memset(buf, 0xff, unit_size);
Akinobu Mita64d240b2015-04-13 23:21:58 +0900894 ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1,
895 buf, unit_size);
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000896 vfree(buf);
897 return ret;
898}
899
900static void fd_free_prot(struct se_device *dev)
901{
902 struct fd_dev *fd_dev = FD_DEV(dev);
903
904 if (!fd_dev->fd_prot_file)
905 return;
906
907 filp_close(fd_dev->fd_prot_file, NULL);
908 fd_dev->fd_prot_file = NULL;
909}
910
Christoph Hellwig9e999a62012-10-07 10:55:50 -0400911static struct sbc_ops fd_sbc_ops = {
Christoph Hellwig0c2ad7d2012-06-17 18:40:52 -0400912 .execute_rw = fd_execute_rw,
Christoph Hellwigad67f0d2012-06-17 18:40:53 -0400913 .execute_sync_cache = fd_execute_sync_cache,
Nicholas Bellinger7b745c82013-02-19 17:30:34 -0800914 .execute_write_same = fd_execute_write_same,
Asias He50642762013-02-25 14:03:43 +0800915 .execute_unmap = fd_execute_unmap,
Christoph Hellwig0c2ad7d2012-06-17 18:40:52 -0400916};
917
Christoph Hellwigde103c92012-11-06 12:24:09 -0800918static sense_reason_t
919fd_parse_cdb(struct se_cmd *cmd)
Christoph Hellwig0c2ad7d2012-06-17 18:40:52 -0400920{
Christoph Hellwig9e999a62012-10-07 10:55:50 -0400921 return sbc_parse_cdb(cmd, &fd_sbc_ops);
Christoph Hellwig0c2ad7d2012-06-17 18:40:52 -0400922}
923
Christoph Hellwig0a06d432015-05-10 18:14:56 +0200924static const struct target_backend_ops fileio_ops = {
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800925 .name = "fileio",
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400926 .inquiry_prod = "FILEIO",
927 .inquiry_rev = FD_VERSION,
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800928 .owner = THIS_MODULE,
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800929 .attach_hba = fd_attach_hba,
930 .detach_hba = fd_detach_hba,
Christoph Hellwig0fd97cc2012-10-08 00:03:19 -0400931 .alloc_device = fd_alloc_device,
932 .configure_device = fd_configure_device,
Mike Christie92634702017-06-23 01:18:12 -0500933 .destroy_device = fd_destroy_device,
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800934 .free_device = fd_free_device,
Christoph Hellwig0c2ad7d2012-06-17 18:40:52 -0400935 .parse_cdb = fd_parse_cdb,
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800936 .set_configfs_dev_params = fd_set_configfs_dev_params,
937 .show_configfs_dev_params = fd_show_configfs_dev_params,
Christoph Hellwig6f23ac82012-10-07 10:55:53 -0400938 .get_device_type = sbc_get_device_type,
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800939 .get_blocks = fd_get_blocks,
Nicholas Bellinger0f5e2ec2014-01-18 09:32:56 +0000940 .init_prot = fd_init_prot,
941 .format_prot = fd_format_prot,
942 .free_prot = fd_free_prot,
Christoph Hellwig5873c4d2015-05-10 18:14:57 +0200943 .tb_dev_attrib_attrs = sbc_attrib_attrs,
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800944};
945
946static int __init fileio_module_init(void)
947{
Christoph Hellwig0a06d432015-05-10 18:14:56 +0200948 return transport_backend_register(&fileio_ops);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800949}
950
Asias He63b91d52013-02-27 12:50:56 +0800951static void __exit fileio_module_exit(void)
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800952{
Christoph Hellwig0a06d432015-05-10 18:14:56 +0200953 target_backend_unregister(&fileio_ops);
Nicholas Bellingerc66ac9d2010-12-17 11:11:26 -0800954}
955
956MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
957MODULE_AUTHOR("nab@Linux-iSCSI.org");
958MODULE_LICENSE("GPL");
959
960module_init(fileio_module_init);
961module_exit(fileio_module_exit);