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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[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 * Check if the underlying struct block_device request_queue supports
165 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
166 * in ATA and we need to set TPE=1
167 */
168 if (blk_queue_discard(q)) {
169 dev->dev_attrib.max_unmap_lba_count =
170 q->limits.max_discard_sectors;
171 /*
172 * Currently hardcoded to 1 in Linux/SCSI code..
173 */
174 dev->dev_attrib.max_unmap_block_desc_count = 1;
175 dev->dev_attrib.unmap_granularity =
176 q->limits.discard_granularity >> 9;
177 dev->dev_attrib.unmap_granularity_alignment =
178 q->limits.discard_alignment;
179 pr_debug("IFILE: BLOCK Discard support available,"
180 " disabled by default\n");
181 }
182 /*
183 * Enable write same emulation for IBLOCK and use 0xFFFF as
184 * the smaller WRITE_SAME(10) only has a two-byte block count.
185 */
186 dev->dev_attrib.max_write_same_len = 0xFFFF;
187
188 if (blk_queue_nonrot(q))
189 dev->dev_attrib.is_nonrot = 1;
190 } else {
191 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
192 pr_err("FILEIO: Missing fd_dev_size="
193 " parameter, and no backing struct"
194 " block_device\n");
195 goto fail;
196 }
197
198 fd_dev->fd_block_size = FD_BLOCKSIZE;
199 /*
200 * Limit UNMAP emulation to 8k Number of LBAs (NoLB)
201 */
202 dev->dev_attrib.max_unmap_lba_count = 0x2000;
203 /*
204 * Currently hardcoded to 1 in Linux/SCSI code..
205 */
206 dev->dev_attrib.max_unmap_block_desc_count = 1;
207 dev->dev_attrib.unmap_granularity = 1;
208 dev->dev_attrib.unmap_granularity_alignment = 0;
209
210 /*
211 * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB)
212 * based upon struct iovec limit for vfs_writev()
213 */
214 dev->dev_attrib.max_write_same_len = 0x1000;
215 }
216
217 dev->dev_attrib.hw_block_size = fd_dev->fd_block_size;
218 dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES;
219 dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size;
220 dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
221
222 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
223 pr_debug("FILEIO: Forcing setting of emulate_write_cache=1"
224 " with FDBD_HAS_BUFFERED_IO_WCE\n");
225 dev->dev_attrib.emulate_write_cache = 1;
226 }
227
228 fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
229 fd_dev->fd_queue_depth = dev->queue_depth;
230
231 pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
232 " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
233 fd_dev->fd_dev_name, fd_dev->fd_dev_size);
234
235 return 0;
236 fail:
237 if (fd_dev->fd_file) {
238 filp_close(fd_dev->fd_file, NULL);
239 fd_dev->fd_file = NULL;
240 }
241 return ret;
242 }
243
244 static void fd_dev_call_rcu(struct rcu_head *p)
245 {
246 struct se_device *dev = container_of(p, struct se_device, rcu_head);
247 struct fd_dev *fd_dev = FD_DEV(dev);
248
249 kfree(fd_dev);
250 }
251
252 static void fd_free_device(struct se_device *dev)
253 {
254 struct fd_dev *fd_dev = FD_DEV(dev);
255
256 if (fd_dev->fd_file) {
257 filp_close(fd_dev->fd_file, NULL);
258 fd_dev->fd_file = NULL;
259 }
260 call_rcu(&dev->rcu_head, fd_dev_call_rcu);
261 }
262
263 static int fd_do_rw(struct se_cmd *cmd, struct file *fd,
264 u32 block_size, struct scatterlist *sgl,
265 u32 sgl_nents, u32 data_length, int is_write)
266 {
267 struct scatterlist *sg;
268 struct iov_iter iter;
269 struct bio_vec *bvec;
270 ssize_t len = 0;
271 loff_t pos = (cmd->t_task_lba * block_size);
272 int ret = 0, i;
273
274 bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
275 if (!bvec) {
276 pr_err("Unable to allocate fd_do_readv iov[]\n");
277 return -ENOMEM;
278 }
279
280 for_each_sg(sgl, sg, sgl_nents, i) {
281 bvec[i].bv_page = sg_page(sg);
282 bvec[i].bv_len = sg->length;
283 bvec[i].bv_offset = sg->offset;
284
285 len += sg->length;
286 }
287
288 iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len);
289 if (is_write)
290 ret = vfs_iter_write(fd, &iter, &pos);
291 else
292 ret = vfs_iter_read(fd, &iter, &pos);
293
294 kfree(bvec);
295
296 if (is_write) {
297 if (ret < 0 || ret != data_length) {
298 pr_err("%s() write returned %d\n", __func__, ret);
299 return (ret < 0 ? ret : -EINVAL);
300 }
301 } else {
302 /*
303 * Return zeros and GOOD status even if the READ did not return
304 * the expected virt_size for struct file w/o a backing struct
305 * block_device.
306 */
307 if (S_ISBLK(file_inode(fd)->i_mode)) {
308 if (ret < 0 || ret != data_length) {
309 pr_err("%s() returned %d, expecting %u for "
310 "S_ISBLK\n", __func__, ret,
311 data_length);
312 return (ret < 0 ? ret : -EINVAL);
313 }
314 } else {
315 if (ret < 0) {
316 pr_err("%s() returned %d for non S_ISBLK\n",
317 __func__, ret);
318 return ret;
319 }
320 }
321 }
322 return 1;
323 }
324
325 static sense_reason_t
326 fd_execute_sync_cache(struct se_cmd *cmd)
327 {
328 struct se_device *dev = cmd->se_dev;
329 struct fd_dev *fd_dev = FD_DEV(dev);
330 int immed = (cmd->t_task_cdb[1] & 0x2);
331 loff_t start, end;
332 int ret;
333
334 /*
335 * If the Immediate bit is set, queue up the GOOD response
336 * for this SYNCHRONIZE_CACHE op
337 */
338 if (immed)
339 target_complete_cmd(cmd, SAM_STAT_GOOD);
340
341 /*
342 * Determine if we will be flushing the entire device.
343 */
344 if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
345 start = 0;
346 end = LLONG_MAX;
347 } else {
348 start = cmd->t_task_lba * dev->dev_attrib.block_size;
349 if (cmd->data_length)
350 end = start + cmd->data_length - 1;
351 else
352 end = LLONG_MAX;
353 }
354
355 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
356 if (ret != 0)
357 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
358
359 if (immed)
360 return 0;
361
362 if (ret)
363 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
364 else
365 target_complete_cmd(cmd, SAM_STAT_GOOD);
366
367 return 0;
368 }
369
370 static sense_reason_t
371 fd_execute_write_same(struct se_cmd *cmd)
372 {
373 struct se_device *se_dev = cmd->se_dev;
374 struct fd_dev *fd_dev = FD_DEV(se_dev);
375 loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
376 sector_t nolb = sbc_get_write_same_sectors(cmd);
377 struct iov_iter iter;
378 struct bio_vec *bvec;
379 unsigned int len = 0, i;
380 ssize_t ret;
381
382 if (!nolb) {
383 target_complete_cmd(cmd, SAM_STAT_GOOD);
384 return 0;
385 }
386 if (cmd->prot_op) {
387 pr_err("WRITE_SAME: Protection information with FILEIO"
388 " backends not supported\n");
389 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
390 }
391
392 if (cmd->t_data_nents > 1 ||
393 cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) {
394 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
395 " block_size: %u\n",
396 cmd->t_data_nents,
397 cmd->t_data_sg[0].length,
398 cmd->se_dev->dev_attrib.block_size);
399 return TCM_INVALID_CDB_FIELD;
400 }
401
402 bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL);
403 if (!bvec)
404 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
405
406 for (i = 0; i < nolb; i++) {
407 bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]);
408 bvec[i].bv_len = cmd->t_data_sg[0].length;
409 bvec[i].bv_offset = cmd->t_data_sg[0].offset;
410
411 len += se_dev->dev_attrib.block_size;
412 }
413
414 iov_iter_bvec(&iter, ITER_BVEC, bvec, nolb, len);
415 ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos);
416
417 kfree(bvec);
418 if (ret < 0 || ret != len) {
419 pr_err("vfs_iter_write() returned %zd for write same\n", ret);
420 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
421 }
422
423 target_complete_cmd(cmd, SAM_STAT_GOOD);
424 return 0;
425 }
426
427 static int
428 fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb,
429 void *buf, size_t bufsize)
430 {
431 struct fd_dev *fd_dev = FD_DEV(se_dev);
432 struct file *prot_fd = fd_dev->fd_prot_file;
433 sector_t prot_length, prot;
434 loff_t pos = lba * se_dev->prot_length;
435
436 if (!prot_fd) {
437 pr_err("Unable to locate fd_dev->fd_prot_file\n");
438 return -ENODEV;
439 }
440
441 prot_length = nolb * se_dev->prot_length;
442
443 for (prot = 0; prot < prot_length;) {
444 sector_t len = min_t(sector_t, bufsize, prot_length - prot);
445 ssize_t ret = kernel_write(prot_fd, buf, len, pos + prot);
446
447 if (ret != len) {
448 pr_err("vfs_write to prot file failed: %zd\n", ret);
449 return ret < 0 ? ret : -ENODEV;
450 }
451 prot += ret;
452 }
453
454 return 0;
455 }
456
457 static int
458 fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
459 {
460 void *buf;
461 int rc;
462
463 buf = (void *)__get_free_page(GFP_KERNEL);
464 if (!buf) {
465 pr_err("Unable to allocate FILEIO prot buf\n");
466 return -ENOMEM;
467 }
468 memset(buf, 0xff, PAGE_SIZE);
469
470 rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE);
471
472 free_page((unsigned long)buf);
473
474 return rc;
475 }
476
477 static sense_reason_t
478 fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
479 {
480 struct file *file = FD_DEV(cmd->se_dev)->fd_file;
481 struct inode *inode = file->f_mapping->host;
482 int ret;
483
484 if (cmd->se_dev->dev_attrib.pi_prot_type) {
485 ret = fd_do_prot_unmap(cmd, lba, nolb);
486 if (ret)
487 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
488 }
489
490 if (S_ISBLK(inode->i_mode)) {
491 /* The backend is block device, use discard */
492 struct block_device *bdev = inode->i_bdev;
493
494 ret = blkdev_issue_discard(bdev, lba,
495 nolb, GFP_KERNEL, 0);
496 if (ret < 0) {
497 pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n",
498 ret);
499 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
500 }
501 } else {
502 /* The backend is normal file, use fallocate */
503 struct se_device *se_dev = cmd->se_dev;
504 loff_t pos = lba * se_dev->dev_attrib.block_size;
505 unsigned int len = nolb * se_dev->dev_attrib.block_size;
506 int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
507
508 if (!file->f_op->fallocate)
509 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
510
511 ret = file->f_op->fallocate(file, mode, pos, len);
512 if (ret < 0) {
513 pr_warn("FILEIO: fallocate() failed: %d\n", ret);
514 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
515 }
516 }
517
518 return 0;
519 }
520
521 static sense_reason_t
522 fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
523 enum dma_data_direction data_direction)
524 {
525 struct se_device *dev = cmd->se_dev;
526 struct fd_dev *fd_dev = FD_DEV(dev);
527 struct file *file = fd_dev->fd_file;
528 struct file *pfile = fd_dev->fd_prot_file;
529 sense_reason_t rc;
530 int ret = 0;
531 /*
532 * We are currently limited by the number of iovecs (2048) per
533 * single vfs_[writev,readv] call.
534 */
535 if (cmd->data_length > FD_MAX_BYTES) {
536 pr_err("FILEIO: Not able to process I/O of %u bytes due to"
537 "FD_MAX_BYTES: %u iovec count limitiation\n",
538 cmd->data_length, FD_MAX_BYTES);
539 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
540 }
541 /*
542 * Call vectorized fileio functions to map struct scatterlist
543 * physical memory addresses to struct iovec virtual memory.
544 */
545 if (data_direction == DMA_FROM_DEVICE) {
546 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
547 ret = fd_do_rw(cmd, pfile, dev->prot_length,
548 cmd->t_prot_sg, cmd->t_prot_nents,
549 cmd->prot_length, 0);
550 if (ret < 0)
551 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
552 }
553
554 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
555 sgl, sgl_nents, cmd->data_length, 0);
556
557 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
558 u32 sectors = cmd->data_length >>
559 ilog2(dev->dev_attrib.block_size);
560
561 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
562 0, cmd->t_prot_sg, 0);
563 if (rc)
564 return rc;
565 }
566 } else {
567 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
568 u32 sectors = cmd->data_length >>
569 ilog2(dev->dev_attrib.block_size);
570
571 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
572 0, cmd->t_prot_sg, 0);
573 if (rc)
574 return rc;
575 }
576
577 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
578 sgl, sgl_nents, cmd->data_length, 1);
579 /*
580 * Perform implicit vfs_fsync_range() for fd_do_writev() ops
581 * for SCSI WRITEs with Forced Unit Access (FUA) set.
582 * Allow this to happen independent of WCE=0 setting.
583 */
584 if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) {
585 loff_t start = cmd->t_task_lba *
586 dev->dev_attrib.block_size;
587 loff_t end;
588
589 if (cmd->data_length)
590 end = start + cmd->data_length - 1;
591 else
592 end = LLONG_MAX;
593
594 vfs_fsync_range(fd_dev->fd_file, start, end, 1);
595 }
596
597 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
598 ret = fd_do_rw(cmd, pfile, dev->prot_length,
599 cmd->t_prot_sg, cmd->t_prot_nents,
600 cmd->prot_length, 1);
601 if (ret < 0)
602 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
603 }
604 }
605
606 if (ret < 0)
607 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
608
609 if (ret)
610 target_complete_cmd(cmd, SAM_STAT_GOOD);
611 return 0;
612 }
613
614 enum {
615 Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
616 };
617
618 static match_table_t tokens = {
619 {Opt_fd_dev_name, "fd_dev_name=%s"},
620 {Opt_fd_dev_size, "fd_dev_size=%s"},
621 {Opt_fd_buffered_io, "fd_buffered_io=%d"},
622 {Opt_err, NULL}
623 };
624
625 static ssize_t fd_set_configfs_dev_params(struct se_device *dev,
626 const char *page, ssize_t count)
627 {
628 struct fd_dev *fd_dev = FD_DEV(dev);
629 char *orig, *ptr, *arg_p, *opts;
630 substring_t args[MAX_OPT_ARGS];
631 int ret = 0, arg, token;
632
633 opts = kstrdup(page, GFP_KERNEL);
634 if (!opts)
635 return -ENOMEM;
636
637 orig = opts;
638
639 while ((ptr = strsep(&opts, ",\n")) != NULL) {
640 if (!*ptr)
641 continue;
642
643 token = match_token(ptr, tokens, args);
644 switch (token) {
645 case Opt_fd_dev_name:
646 if (match_strlcpy(fd_dev->fd_dev_name, &args[0],
647 FD_MAX_DEV_NAME) == 0) {
648 ret = -EINVAL;
649 break;
650 }
651 pr_debug("FILEIO: Referencing Path: %s\n",
652 fd_dev->fd_dev_name);
653 fd_dev->fbd_flags |= FBDF_HAS_PATH;
654 break;
655 case Opt_fd_dev_size:
656 arg_p = match_strdup(&args[0]);
657 if (!arg_p) {
658 ret = -ENOMEM;
659 break;
660 }
661 ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size);
662 kfree(arg_p);
663 if (ret < 0) {
664 pr_err("kstrtoull() failed for"
665 " fd_dev_size=\n");
666 goto out;
667 }
668 pr_debug("FILEIO: Referencing Size: %llu"
669 " bytes\n", fd_dev->fd_dev_size);
670 fd_dev->fbd_flags |= FBDF_HAS_SIZE;
671 break;
672 case Opt_fd_buffered_io:
673 ret = match_int(args, &arg);
674 if (ret)
675 goto out;
676 if (arg != 1) {
677 pr_err("bogus fd_buffered_io=%d value\n", arg);
678 ret = -EINVAL;
679 goto out;
680 }
681
682 pr_debug("FILEIO: Using buffered I/O"
683 " operations for struct fd_dev\n");
684
685 fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
686 break;
687 default:
688 break;
689 }
690 }
691
692 out:
693 kfree(orig);
694 return (!ret) ? count : ret;
695 }
696
697 static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b)
698 {
699 struct fd_dev *fd_dev = FD_DEV(dev);
700 ssize_t bl = 0;
701
702 bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
703 bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n",
704 fd_dev->fd_dev_name, fd_dev->fd_dev_size,
705 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ?
706 "Buffered-WCE" : "O_DSYNC");
707 return bl;
708 }
709
710 static sector_t fd_get_blocks(struct se_device *dev)
711 {
712 struct fd_dev *fd_dev = FD_DEV(dev);
713 struct file *f = fd_dev->fd_file;
714 struct inode *i = f->f_mapping->host;
715 unsigned long long dev_size;
716 /*
717 * When using a file that references an underlying struct block_device,
718 * ensure dev_size is always based on the current inode size in order
719 * to handle underlying block_device resize operations.
720 */
721 if (S_ISBLK(i->i_mode))
722 dev_size = i_size_read(i);
723 else
724 dev_size = fd_dev->fd_dev_size;
725
726 return div_u64(dev_size - dev->dev_attrib.block_size,
727 dev->dev_attrib.block_size);
728 }
729
730 static int fd_init_prot(struct se_device *dev)
731 {
732 struct fd_dev *fd_dev = FD_DEV(dev);
733 struct file *prot_file, *file = fd_dev->fd_file;
734 struct inode *inode;
735 int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
736 char buf[FD_MAX_DEV_PROT_NAME];
737
738 if (!file) {
739 pr_err("Unable to locate fd_dev->fd_file\n");
740 return -ENODEV;
741 }
742
743 inode = file->f_mapping->host;
744 if (S_ISBLK(inode->i_mode)) {
745 pr_err("FILEIO Protection emulation only supported on"
746 " !S_ISBLK\n");
747 return -ENOSYS;
748 }
749
750 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE)
751 flags &= ~O_DSYNC;
752
753 snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection",
754 fd_dev->fd_dev_name);
755
756 prot_file = filp_open(buf, flags, 0600);
757 if (IS_ERR(prot_file)) {
758 pr_err("filp_open(%s) failed\n", buf);
759 ret = PTR_ERR(prot_file);
760 return ret;
761 }
762 fd_dev->fd_prot_file = prot_file;
763
764 return 0;
765 }
766
767 static int fd_format_prot(struct se_device *dev)
768 {
769 unsigned char *buf;
770 int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size;
771 int ret;
772
773 if (!dev->dev_attrib.pi_prot_type) {
774 pr_err("Unable to format_prot while pi_prot_type == 0\n");
775 return -ENODEV;
776 }
777
778 buf = vzalloc(unit_size);
779 if (!buf) {
780 pr_err("Unable to allocate FILEIO prot buf\n");
781 return -ENOMEM;
782 }
783
784 pr_debug("Using FILEIO prot_length: %llu\n",
785 (unsigned long long)(dev->transport->get_blocks(dev) + 1) *
786 dev->prot_length);
787
788 memset(buf, 0xff, unit_size);
789 ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1,
790 buf, unit_size);
791 vfree(buf);
792 return ret;
793 }
794
795 static void fd_free_prot(struct se_device *dev)
796 {
797 struct fd_dev *fd_dev = FD_DEV(dev);
798
799 if (!fd_dev->fd_prot_file)
800 return;
801
802 filp_close(fd_dev->fd_prot_file, NULL);
803 fd_dev->fd_prot_file = NULL;
804 }
805
806 static struct sbc_ops fd_sbc_ops = {
807 .execute_rw = fd_execute_rw,
808 .execute_sync_cache = fd_execute_sync_cache,
809 .execute_write_same = fd_execute_write_same,
810 .execute_unmap = fd_execute_unmap,
811 };
812
813 static sense_reason_t
814 fd_parse_cdb(struct se_cmd *cmd)
815 {
816 return sbc_parse_cdb(cmd, &fd_sbc_ops);
817 }
818
819 static const struct target_backend_ops fileio_ops = {
820 .name = "fileio",
821 .inquiry_prod = "FILEIO",
822 .inquiry_rev = FD_VERSION,
823 .owner = THIS_MODULE,
824 .attach_hba = fd_attach_hba,
825 .detach_hba = fd_detach_hba,
826 .alloc_device = fd_alloc_device,
827 .configure_device = fd_configure_device,
828 .free_device = fd_free_device,
829 .parse_cdb = fd_parse_cdb,
830 .set_configfs_dev_params = fd_set_configfs_dev_params,
831 .show_configfs_dev_params = fd_show_configfs_dev_params,
832 .get_device_type = sbc_get_device_type,
833 .get_blocks = fd_get_blocks,
834 .init_prot = fd_init_prot,
835 .format_prot = fd_format_prot,
836 .free_prot = fd_free_prot,
837 .tb_dev_attrib_attrs = sbc_attrib_attrs,
838 };
839
840 static int __init fileio_module_init(void)
841 {
842 return transport_backend_register(&fileio_ops);
843 }
844
845 static void __exit fileio_module_exit(void)
846 {
847 target_backend_unregister(&fileio_ops);
848 }
849
850 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
851 MODULE_AUTHOR("nab@Linux-iSCSI.org");
852 MODULE_LICENSE("GPL");
853
854 module_init(fileio_module_init);
855 module_exit(fileio_module_exit);
Linux kernel - Deliverables
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