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Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / drivers / target / target_core_file.c
1 /*******************************************************************************
2 * Filename: target_core_file.c
3 *
4 * This file contains the Storage Engine <-> FILEIO transport specific functions
5 *
6 * (c) Copyright 2005-2013 Datera, Inc.
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
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>
32 #include <linux/module.h>
33 #include <linux/vmalloc.h>
34 #include <linux/falloc.h>
35 #include <scsi/scsi_proto.h>
36 #include <asm/unaligned.h>
37
38 #include <target/target_core_base.h>
39 #include <target/target_core_backend.h>
40
41 #include "target_core_file.h"
42
43 static inline struct fd_dev *FD_DEV(struct se_device *dev)
44 {
45 return container_of(dev, struct fd_dev, dev);
46 }
47
48 static int fd_attach_hba(struct se_hba *hba, u32 host_id)
49 {
50 struct fd_host *fd_host;
51
52 fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
53 if (!fd_host) {
54 pr_err("Unable to allocate memory for struct fd_host\n");
55 return -ENOMEM;
56 }
57
58 fd_host->fd_host_id = host_id;
59
60 hba->hba_ptr = fd_host;
61
62 pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic"
63 " Target Core Stack %s\n", hba->hba_id, FD_VERSION,
64 TARGET_CORE_VERSION);
65 pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n",
66 hba->hba_id, fd_host->fd_host_id);
67
68 return 0;
69 }
70
71 static void fd_detach_hba(struct se_hba *hba)
72 {
73 struct fd_host *fd_host = hba->hba_ptr;
74
75 pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic"
76 " Target Core\n", hba->hba_id, fd_host->fd_host_id);
77
78 kfree(fd_host);
79 hba->hba_ptr = NULL;
80 }
81
82 static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name)
83 {
84 struct fd_dev *fd_dev;
85 struct fd_host *fd_host = hba->hba_ptr;
86
87 fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
88 if (!fd_dev) {
89 pr_err("Unable to allocate memory for struct fd_dev\n");
90 return NULL;
91 }
92
93 fd_dev->fd_host = fd_host;
94
95 pr_debug("FILEIO: Allocated fd_dev for %p\n", name);
96
97 return &fd_dev->dev;
98 }
99
100 static int fd_configure_device(struct se_device *dev)
101 {
102 struct fd_dev *fd_dev = FD_DEV(dev);
103 struct fd_host *fd_host = dev->se_hba->hba_ptr;
104 struct file *file;
105 struct inode *inode = NULL;
106 int flags, ret = -EINVAL;
107
108 if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
109 pr_err("Missing fd_dev_name=\n");
110 return -EINVAL;
111 }
112
113 /*
114 * Use O_DSYNC by default instead of O_SYNC to forgo syncing
115 * of pure timestamp updates.
116 */
117 flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
118
119 /*
120 * Optionally allow fd_buffered_io=1 to be enabled for people
121 * who want use the fs buffer cache as an WriteCache mechanism.
122 *
123 * This means that in event of a hard failure, there is a risk
124 * of silent data-loss if the SCSI client has *not* performed a
125 * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE
126 * to write-out the entire device cache.
127 */
128 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
129 pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n");
130 flags &= ~O_DSYNC;
131 }
132
133 file = filp_open(fd_dev->fd_dev_name, flags, 0600);
134 if (IS_ERR(file)) {
135 pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name);
136 ret = PTR_ERR(file);
137 goto fail;
138 }
139 fd_dev->fd_file = file;
140 /*
141 * If using a block backend with this struct file, we extract
142 * fd_dev->fd_[block,dev]_size from struct block_device.
143 *
144 * Otherwise, we use the passed fd_size= from configfs
145 */
146 inode = file->f_mapping->host;
147 if (S_ISBLK(inode->i_mode)) {
148 struct request_queue *q = bdev_get_queue(inode->i_bdev);
149 unsigned long long dev_size;
150
151 fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
152 /*
153 * Determine the number of bytes from i_size_read() minus
154 * one (1) logical sector from underlying struct block_device
155 */
156 dev_size = (i_size_read(file->f_mapping->host) -
157 fd_dev->fd_block_size);
158
159 pr_debug("FILEIO: Using size: %llu bytes from struct"
160 " block_device blocks: %llu logical_block_size: %d\n",
161 dev_size, div_u64(dev_size, fd_dev->fd_block_size),
162 fd_dev->fd_block_size);
163
164 if (target_configure_unmap_from_queue(&dev->dev_attrib, q,
165 fd_dev->fd_block_size))
166 pr_debug("IFILE: BLOCK Discard support available,"
167 " disabled by default\n");
168 /*
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;
173
174 if (blk_queue_nonrot(q))
175 dev->dev_attrib.is_nonrot = 1;
176 } else {
177 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
178 pr_err("FILEIO: Missing fd_dev_size="
179 " parameter, and no backing struct"
180 " block_device\n");
181 goto fail;
182 }
183
184 fd_dev->fd_block_size = FD_BLOCKSIZE;
185 /*
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;
201 }
202
203 dev->dev_attrib.hw_block_size = fd_dev->fd_block_size;
204 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;
206 dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
207
208 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");
211 dev->dev_attrib.emulate_write_cache = 1;
212 }
213
214 fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
215 fd_dev->fd_queue_depth = dev->queue_depth;
216
217 pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
218 " %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
221 return 0;
222 fail:
223 if (fd_dev->fd_file) {
224 filp_close(fd_dev->fd_file, NULL);
225 fd_dev->fd_file = NULL;
226 }
227 return ret;
228 }
229
230 static 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
238 static void fd_free_device(struct se_device *dev)
239 {
240 struct fd_dev *fd_dev = FD_DEV(dev);
241
242 if (fd_dev->fd_file) {
243 filp_close(fd_dev->fd_file, NULL);
244 fd_dev->fd_file = NULL;
245 }
246 call_rcu(&dev->rcu_head, fd_dev_call_rcu);
247 }
248
249 static int fd_do_rw(struct se_cmd *cmd, struct file *fd,
250 u32 block_size, struct scatterlist *sgl,
251 u32 sgl_nents, u32 data_length, int is_write)
252 {
253 struct scatterlist *sg;
254 struct iov_iter iter;
255 struct bio_vec *bvec;
256 ssize_t len = 0;
257 loff_t pos = (cmd->t_task_lba * block_size);
258 int ret = 0, i;
259
260 bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
261 if (!bvec) {
262 pr_err("Unable to allocate fd_do_readv iov[]\n");
263 return -ENOMEM;
264 }
265
266 for_each_sg(sgl, sg, sgl_nents, i) {
267 bvec[i].bv_page = sg_page(sg);
268 bvec[i].bv_len = sg->length;
269 bvec[i].bv_offset = sg->offset;
270
271 len += sg->length;
272 }
273
274 iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len);
275 if (is_write)
276 ret = vfs_iter_write(fd, &iter, &pos);
277 else
278 ret = vfs_iter_read(fd, &iter, &pos);
279
280 kfree(bvec);
281
282 if (is_write) {
283 if (ret < 0 || ret != data_length) {
284 pr_err("%s() write returned %d\n", __func__, ret);
285 return (ret < 0 ? ret : -EINVAL);
286 }
287 } else {
288 /*
289 * Return zeros and GOOD status even if the READ did not return
290 * the expected virt_size for struct file w/o a backing struct
291 * block_device.
292 */
293 if (S_ISBLK(file_inode(fd)->i_mode)) {
294 if (ret < 0 || ret != data_length) {
295 pr_err("%s() returned %d, expecting %u for "
296 "S_ISBLK\n", __func__, ret,
297 data_length);
298 return (ret < 0 ? ret : -EINVAL);
299 }
300 } else {
301 if (ret < 0) {
302 pr_err("%s() returned %d for non S_ISBLK\n",
303 __func__, ret);
304 return ret;
305 }
306 }
307 }
308 return 1;
309 }
310
311 static sense_reason_t
312 fd_execute_sync_cache(struct se_cmd *cmd)
313 {
314 struct se_device *dev = cmd->se_dev;
315 struct fd_dev *fd_dev = FD_DEV(dev);
316 int immed = (cmd->t_task_cdb[1] & 0x2);
317 loff_t start, end;
318 int ret;
319
320 /*
321 * If the Immediate bit is set, queue up the GOOD response
322 * for this SYNCHRONIZE_CACHE op
323 */
324 if (immed)
325 target_complete_cmd(cmd, SAM_STAT_GOOD);
326
327 /*
328 * Determine if we will be flushing the entire device.
329 */
330 if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
331 start = 0;
332 end = LLONG_MAX;
333 } else {
334 start = cmd->t_task_lba * dev->dev_attrib.block_size;
335 if (cmd->data_length)
336 end = start + cmd->data_length - 1;
337 else
338 end = LLONG_MAX;
339 }
340
341 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
342 if (ret != 0)
343 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
344
345 if (immed)
346 return 0;
347
348 if (ret)
349 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
350 else
351 target_complete_cmd(cmd, SAM_STAT_GOOD);
352
353 return 0;
354 }
355
356 static sense_reason_t
357 fd_execute_write_same(struct se_cmd *cmd)
358 {
359 struct se_device *se_dev = cmd->se_dev;
360 struct fd_dev *fd_dev = FD_DEV(se_dev);
361 loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
362 sector_t nolb = sbc_get_write_same_sectors(cmd);
363 struct iov_iter iter;
364 struct bio_vec *bvec;
365 unsigned int len = 0, i;
366 ssize_t ret;
367
368 if (!nolb) {
369 target_complete_cmd(cmd, SAM_STAT_GOOD);
370 return 0;
371 }
372 if (cmd->prot_op) {
373 pr_err("WRITE_SAME: Protection information with FILEIO"
374 " backends not supported\n");
375 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
376 }
377
378 if (cmd->t_data_nents > 1 ||
379 cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) {
380 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
381 " block_size: %u\n",
382 cmd->t_data_nents,
383 cmd->t_data_sg[0].length,
384 cmd->se_dev->dev_attrib.block_size);
385 return TCM_INVALID_CDB_FIELD;
386 }
387
388 bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL);
389 if (!bvec)
390 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
391
392 for (i = 0; i < nolb; i++) {
393 bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]);
394 bvec[i].bv_len = cmd->t_data_sg[0].length;
395 bvec[i].bv_offset = cmd->t_data_sg[0].offset;
396
397 len += se_dev->dev_attrib.block_size;
398 }
399
400 iov_iter_bvec(&iter, ITER_BVEC, bvec, nolb, len);
401 ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos);
402
403 kfree(bvec);
404 if (ret < 0 || ret != len) {
405 pr_err("vfs_iter_write() returned %zd for write same\n", ret);
406 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
407 }
408
409 target_complete_cmd(cmd, SAM_STAT_GOOD);
410 return 0;
411 }
412
413 static int
414 fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb,
415 void *buf, size_t bufsize)
416 {
417 struct fd_dev *fd_dev = FD_DEV(se_dev);
418 struct file *prot_fd = fd_dev->fd_prot_file;
419 sector_t prot_length, prot;
420 loff_t pos = lba * se_dev->prot_length;
421
422 if (!prot_fd) {
423 pr_err("Unable to locate fd_dev->fd_prot_file\n");
424 return -ENODEV;
425 }
426
427 prot_length = nolb * se_dev->prot_length;
428
429 for (prot = 0; prot < prot_length;) {
430 sector_t len = min_t(sector_t, bufsize, prot_length - prot);
431 ssize_t ret = kernel_write(prot_fd, buf, len, pos + prot);
432
433 if (ret != len) {
434 pr_err("vfs_write to prot file failed: %zd\n", ret);
435 return ret < 0 ? ret : -ENODEV;
436 }
437 prot += ret;
438 }
439
440 return 0;
441 }
442
443 static int
444 fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
445 {
446 void *buf;
447 int rc;
448
449 buf = (void *)__get_free_page(GFP_KERNEL);
450 if (!buf) {
451 pr_err("Unable to allocate FILEIO prot buf\n");
452 return -ENOMEM;
453 }
454 memset(buf, 0xff, PAGE_SIZE);
455
456 rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE);
457
458 free_page((unsigned long)buf);
459
460 return rc;
461 }
462
463 static sense_reason_t
464 fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
465 {
466 struct file *file = FD_DEV(cmd->se_dev)->fd_file;
467 struct inode *inode = file->f_mapping->host;
468 int ret;
469
470 if (cmd->se_dev->dev_attrib.pi_prot_type) {
471 ret = fd_do_prot_unmap(cmd, lba, nolb);
472 if (ret)
473 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
474 }
475
476 if (S_ISBLK(inode->i_mode)) {
477 /* The backend is block device, use discard */
478 struct block_device *bdev = inode->i_bdev;
479 struct se_device *dev = cmd->se_dev;
480
481 ret = blkdev_issue_discard(bdev,
482 target_to_linux_sector(dev, lba),
483 target_to_linux_sector(dev, nolb),
484 GFP_KERNEL, 0);
485 if (ret < 0) {
486 pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n",
487 ret);
488 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
489 }
490 } else {
491 /* The backend is normal file, use fallocate */
492 struct se_device *se_dev = cmd->se_dev;
493 loff_t pos = lba * se_dev->dev_attrib.block_size;
494 unsigned int len = nolb * se_dev->dev_attrib.block_size;
495 int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
496
497 if (!file->f_op->fallocate)
498 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
499
500 ret = file->f_op->fallocate(file, mode, pos, len);
501 if (ret < 0) {
502 pr_warn("FILEIO: fallocate() failed: %d\n", ret);
503 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
504 }
505 }
506
507 return 0;
508 }
509
510 static sense_reason_t
511 fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
512 enum dma_data_direction data_direction)
513 {
514 struct se_device *dev = cmd->se_dev;
515 struct fd_dev *fd_dev = FD_DEV(dev);
516 struct file *file = fd_dev->fd_file;
517 struct file *pfile = fd_dev->fd_prot_file;
518 sense_reason_t rc;
519 int ret = 0;
520 /*
521 * We are currently limited by the number of iovecs (2048) per
522 * single vfs_[writev,readv] call.
523 */
524 if (cmd->data_length > FD_MAX_BYTES) {
525 pr_err("FILEIO: Not able to process I/O of %u bytes due to"
526 "FD_MAX_BYTES: %u iovec count limitiation\n",
527 cmd->data_length, FD_MAX_BYTES);
528 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
529 }
530 /*
531 * Call vectorized fileio functions to map struct scatterlist
532 * physical memory addresses to struct iovec virtual memory.
533 */
534 if (data_direction == DMA_FROM_DEVICE) {
535 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
536 ret = fd_do_rw(cmd, pfile, dev->prot_length,
537 cmd->t_prot_sg, cmd->t_prot_nents,
538 cmd->prot_length, 0);
539 if (ret < 0)
540 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
541 }
542
543 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
544 sgl, sgl_nents, cmd->data_length, 0);
545
546 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
547 u32 sectors = cmd->data_length >>
548 ilog2(dev->dev_attrib.block_size);
549
550 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
551 0, cmd->t_prot_sg, 0);
552 if (rc)
553 return rc;
554 }
555 } else {
556 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
557 u32 sectors = cmd->data_length >>
558 ilog2(dev->dev_attrib.block_size);
559
560 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
561 0, cmd->t_prot_sg, 0);
562 if (rc)
563 return rc;
564 }
565
566 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
567 sgl, sgl_nents, cmd->data_length, 1);
568 /*
569 * Perform implicit vfs_fsync_range() for fd_do_writev() ops
570 * for SCSI WRITEs with Forced Unit Access (FUA) set.
571 * Allow this to happen independent of WCE=0 setting.
572 */
573 if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) {
574 loff_t start = cmd->t_task_lba *
575 dev->dev_attrib.block_size;
576 loff_t end;
577
578 if (cmd->data_length)
579 end = start + cmd->data_length - 1;
580 else
581 end = LLONG_MAX;
582
583 vfs_fsync_range(fd_dev->fd_file, start, end, 1);
584 }
585
586 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
587 ret = fd_do_rw(cmd, pfile, dev->prot_length,
588 cmd->t_prot_sg, cmd->t_prot_nents,
589 cmd->prot_length, 1);
590 if (ret < 0)
591 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
592 }
593 }
594
595 if (ret < 0)
596 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
597
598 if (ret)
599 target_complete_cmd(cmd, SAM_STAT_GOOD);
600 return 0;
601 }
602
603 enum {
604 Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
605 };
606
607 static match_table_t tokens = {
608 {Opt_fd_dev_name, "fd_dev_name=%s"},
609 {Opt_fd_dev_size, "fd_dev_size=%s"},
610 {Opt_fd_buffered_io, "fd_buffered_io=%d"},
611 {Opt_err, NULL}
612 };
613
614 static ssize_t fd_set_configfs_dev_params(struct se_device *dev,
615 const char *page, ssize_t count)
616 {
617 struct fd_dev *fd_dev = FD_DEV(dev);
618 char *orig, *ptr, *arg_p, *opts;
619 substring_t args[MAX_OPT_ARGS];
620 int ret = 0, arg, token;
621
622 opts = kstrdup(page, GFP_KERNEL);
623 if (!opts)
624 return -ENOMEM;
625
626 orig = opts;
627
628 while ((ptr = strsep(&opts, ",\n")) != NULL) {
629 if (!*ptr)
630 continue;
631
632 token = match_token(ptr, tokens, args);
633 switch (token) {
634 case Opt_fd_dev_name:
635 if (match_strlcpy(fd_dev->fd_dev_name, &args[0],
636 FD_MAX_DEV_NAME) == 0) {
637 ret = -EINVAL;
638 break;
639 }
640 pr_debug("FILEIO: Referencing Path: %s\n",
641 fd_dev->fd_dev_name);
642 fd_dev->fbd_flags |= FBDF_HAS_PATH;
643 break;
644 case Opt_fd_dev_size:
645 arg_p = match_strdup(&args[0]);
646 if (!arg_p) {
647 ret = -ENOMEM;
648 break;
649 }
650 ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size);
651 kfree(arg_p);
652 if (ret < 0) {
653 pr_err("kstrtoull() failed for"
654 " fd_dev_size=\n");
655 goto out;
656 }
657 pr_debug("FILEIO: Referencing Size: %llu"
658 " bytes\n", fd_dev->fd_dev_size);
659 fd_dev->fbd_flags |= FBDF_HAS_SIZE;
660 break;
661 case Opt_fd_buffered_io:
662 ret = match_int(args, &arg);
663 if (ret)
664 goto out;
665 if (arg != 1) {
666 pr_err("bogus fd_buffered_io=%d value\n", arg);
667 ret = -EINVAL;
668 goto out;
669 }
670
671 pr_debug("FILEIO: Using buffered I/O"
672 " operations for struct fd_dev\n");
673
674 fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
675 break;
676 default:
677 break;
678 }
679 }
680
681 out:
682 kfree(orig);
683 return (!ret) ? count : ret;
684 }
685
686 static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b)
687 {
688 struct fd_dev *fd_dev = FD_DEV(dev);
689 ssize_t bl = 0;
690
691 bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
692 bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n",
693 fd_dev->fd_dev_name, fd_dev->fd_dev_size,
694 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ?
695 "Buffered-WCE" : "O_DSYNC");
696 return bl;
697 }
698
699 static sector_t fd_get_blocks(struct se_device *dev)
700 {
701 struct fd_dev *fd_dev = FD_DEV(dev);
702 struct file *f = fd_dev->fd_file;
703 struct inode *i = f->f_mapping->host;
704 unsigned long long dev_size;
705 /*
706 * When using a file that references an underlying struct block_device,
707 * ensure dev_size is always based on the current inode size in order
708 * to handle underlying block_device resize operations.
709 */
710 if (S_ISBLK(i->i_mode))
711 dev_size = i_size_read(i);
712 else
713 dev_size = fd_dev->fd_dev_size;
714
715 return div_u64(dev_size - dev->dev_attrib.block_size,
716 dev->dev_attrib.block_size);
717 }
718
719 static int fd_init_prot(struct se_device *dev)
720 {
721 struct fd_dev *fd_dev = FD_DEV(dev);
722 struct file *prot_file, *file = fd_dev->fd_file;
723 struct inode *inode;
724 int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
725 char buf[FD_MAX_DEV_PROT_NAME];
726
727 if (!file) {
728 pr_err("Unable to locate fd_dev->fd_file\n");
729 return -ENODEV;
730 }
731
732 inode = file->f_mapping->host;
733 if (S_ISBLK(inode->i_mode)) {
734 pr_err("FILEIO Protection emulation only supported on"
735 " !S_ISBLK\n");
736 return -ENOSYS;
737 }
738
739 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE)
740 flags &= ~O_DSYNC;
741
742 snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection",
743 fd_dev->fd_dev_name);
744
745 prot_file = filp_open(buf, flags, 0600);
746 if (IS_ERR(prot_file)) {
747 pr_err("filp_open(%s) failed\n", buf);
748 ret = PTR_ERR(prot_file);
749 return ret;
750 }
751 fd_dev->fd_prot_file = prot_file;
752
753 return 0;
754 }
755
756 static int fd_format_prot(struct se_device *dev)
757 {
758 unsigned char *buf;
759 int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size;
760 int ret;
761
762 if (!dev->dev_attrib.pi_prot_type) {
763 pr_err("Unable to format_prot while pi_prot_type == 0\n");
764 return -ENODEV;
765 }
766
767 buf = vzalloc(unit_size);
768 if (!buf) {
769 pr_err("Unable to allocate FILEIO prot buf\n");
770 return -ENOMEM;
771 }
772
773 pr_debug("Using FILEIO prot_length: %llu\n",
774 (unsigned long long)(dev->transport->get_blocks(dev) + 1) *
775 dev->prot_length);
776
777 memset(buf, 0xff, unit_size);
778 ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1,
779 buf, unit_size);
780 vfree(buf);
781 return ret;
782 }
783
784 static void fd_free_prot(struct se_device *dev)
785 {
786 struct fd_dev *fd_dev = FD_DEV(dev);
787
788 if (!fd_dev->fd_prot_file)
789 return;
790
791 filp_close(fd_dev->fd_prot_file, NULL);
792 fd_dev->fd_prot_file = NULL;
793 }
794
795 static struct sbc_ops fd_sbc_ops = {
796 .execute_rw = fd_execute_rw,
797 .execute_sync_cache = fd_execute_sync_cache,
798 .execute_write_same = fd_execute_write_same,
799 .execute_unmap = fd_execute_unmap,
800 };
801
802 static sense_reason_t
803 fd_parse_cdb(struct se_cmd *cmd)
804 {
805 return sbc_parse_cdb(cmd, &fd_sbc_ops);
806 }
807
808 static const struct target_backend_ops fileio_ops = {
809 .name = "fileio",
810 .inquiry_prod = "FILEIO",
811 .inquiry_rev = FD_VERSION,
812 .owner = THIS_MODULE,
813 .attach_hba = fd_attach_hba,
814 .detach_hba = fd_detach_hba,
815 .alloc_device = fd_alloc_device,
816 .configure_device = fd_configure_device,
817 .free_device = fd_free_device,
818 .parse_cdb = fd_parse_cdb,
819 .set_configfs_dev_params = fd_set_configfs_dev_params,
820 .show_configfs_dev_params = fd_show_configfs_dev_params,
821 .get_device_type = sbc_get_device_type,
822 .get_blocks = fd_get_blocks,
823 .init_prot = fd_init_prot,
824 .format_prot = fd_format_prot,
825 .free_prot = fd_free_prot,
826 .tb_dev_attrib_attrs = sbc_attrib_attrs,
827 };
828
829 static int __init fileio_module_init(void)
830 {
831 return transport_backend_register(&fileio_ops);
832 }
833
834 static void __exit fileio_module_exit(void)
835 {
836 target_backend_unregister(&fileio_ops);
837 }
838
839 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
840 MODULE_AUTHOR("nab@Linux-iSCSI.org");
841 MODULE_LICENSE("GPL");
842
843 module_init(fileio_module_init);
844 module_exit(fileio_module_exit);
Linux kernel - Deliverables
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