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md/raid5: Convert to hotplug state machine
[linux-2.6/btrfs-unstable.git] / drivers / target / target_core_file.c
blobd545993df18be9ede3253861e24c25726d9a8e27
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 pr_debug("IFILE: BLOCK Discard support available,"
166 " disabled by default\n");
167 /*
168 * Enable write same emulation for IBLOCK and use 0xFFFF as
169 * the smaller WRITE_SAME(10) only has a two-byte block count.
170 */
171 dev->dev_attrib.max_write_same_len = 0xFFFF;
172
173 if (blk_queue_nonrot(q))
174 dev->dev_attrib.is_nonrot = 1;
175 } else {
176 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
177 pr_err("FILEIO: Missing fd_dev_size="
178 " parameter, and no backing struct"
179 " block_device\n");
180 goto fail;
181 }
182
183 fd_dev->fd_block_size = FD_BLOCKSIZE;
184 /*
185 * Limit UNMAP emulation to 8k Number of LBAs (NoLB)
186 */
187 dev->dev_attrib.max_unmap_lba_count = 0x2000;
188 /*
189 * Currently hardcoded to 1 in Linux/SCSI code..
190 */
191 dev->dev_attrib.max_unmap_block_desc_count = 1;
192 dev->dev_attrib.unmap_granularity = 1;
193 dev->dev_attrib.unmap_granularity_alignment = 0;
194
195 /*
196 * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB)
197 * based upon struct iovec limit for vfs_writev()
198 */
199 dev->dev_attrib.max_write_same_len = 0x1000;
200 }
201
202 dev->dev_attrib.hw_block_size = fd_dev->fd_block_size;
203 dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES;
204 dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size;
205 dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
206
207 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
208 pr_debug("FILEIO: Forcing setting of emulate_write_cache=1"
209 " with FDBD_HAS_BUFFERED_IO_WCE\n");
210 dev->dev_attrib.emulate_write_cache = 1;
211 }
212
213 fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
214 fd_dev->fd_queue_depth = dev->queue_depth;
215
216 pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
217 " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
218 fd_dev->fd_dev_name, fd_dev->fd_dev_size);
219
220 return 0;
221 fail:
222 if (fd_dev->fd_file) {
223 filp_close(fd_dev->fd_file, NULL);
224 fd_dev->fd_file = NULL;
225 }
226 return ret;
227 }
228
229 static void fd_dev_call_rcu(struct rcu_head *p)
230 {
231 struct se_device *dev = container_of(p, struct se_device, rcu_head);
232 struct fd_dev *fd_dev = FD_DEV(dev);
233
234 kfree(fd_dev);
235 }
236
237 static void fd_free_device(struct se_device *dev)
238 {
239 struct fd_dev *fd_dev = FD_DEV(dev);
240
241 if (fd_dev->fd_file) {
242 filp_close(fd_dev->fd_file, NULL);
243 fd_dev->fd_file = NULL;
244 }
245 call_rcu(&dev->rcu_head, fd_dev_call_rcu);
246 }
247
248 static int fd_do_rw(struct se_cmd *cmd, struct file *fd,
249 u32 block_size, struct scatterlist *sgl,
250 u32 sgl_nents, u32 data_length, int is_write)
251 {
252 struct scatterlist *sg;
253 struct iov_iter iter;
254 struct bio_vec *bvec;
255 ssize_t len = 0;
256 loff_t pos = (cmd->t_task_lba * block_size);
257 int ret = 0, i;
258
259 bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
260 if (!bvec) {
261 pr_err("Unable to allocate fd_do_readv iov[]\n");
262 return -ENOMEM;
263 }
264
265 for_each_sg(sgl, sg, sgl_nents, i) {
266 bvec[i].bv_page = sg_page(sg);
267 bvec[i].bv_len = sg->length;
268 bvec[i].bv_offset = sg->offset;
269
270 len += sg->length;
271 }
272
273 iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len);
274 if (is_write)
275 ret = vfs_iter_write(fd, &iter, &pos);
276 else
277 ret = vfs_iter_read(fd, &iter, &pos);
278
279 kfree(bvec);
280
281 if (is_write) {
282 if (ret < 0 || ret != data_length) {
283 pr_err("%s() write returned %d\n", __func__, ret);
284 return (ret < 0 ? ret : -EINVAL);
285 }
286 } else {
287 /*
288 * Return zeros and GOOD status even if the READ did not return
289 * the expected virt_size for struct file w/o a backing struct
290 * block_device.
291 */
292 if (S_ISBLK(file_inode(fd)->i_mode)) {
293 if (ret < 0 || ret != data_length) {
294 pr_err("%s() returned %d, expecting %u for "
295 "S_ISBLK\n", __func__, ret,
296 data_length);
297 return (ret < 0 ? ret : -EINVAL);
298 }
299 } else {
300 if (ret < 0) {
301 pr_err("%s() returned %d for non S_ISBLK\n",
302 __func__, ret);
303 return ret;
304 }
305 }
306 }
307 return 1;
308 }
309
310 static sense_reason_t
311 fd_execute_sync_cache(struct se_cmd *cmd)
312 {
313 struct se_device *dev = cmd->se_dev;
314 struct fd_dev *fd_dev = FD_DEV(dev);
315 int immed = (cmd->t_task_cdb[1] & 0x2);
316 loff_t start, end;
317 int ret;
318
319 /*
320 * If the Immediate bit is set, queue up the GOOD response
321 * for this SYNCHRONIZE_CACHE op
322 */
323 if (immed)
324 target_complete_cmd(cmd, SAM_STAT_GOOD);
325
326 /*
327 * Determine if we will be flushing the entire device.
328 */
329 if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
330 start = 0;
331 end = LLONG_MAX;
332 } else {
333 start = cmd->t_task_lba * dev->dev_attrib.block_size;
334 if (cmd->data_length)
335 end = start + cmd->data_length - 1;
336 else
337 end = LLONG_MAX;
338 }
339
340 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
341 if (ret != 0)
342 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
343
344 if (immed)
345 return 0;
346
347 if (ret)
348 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
349 else
350 target_complete_cmd(cmd, SAM_STAT_GOOD);
351
352 return 0;
353 }
354
355 static sense_reason_t
356 fd_execute_write_same(struct se_cmd *cmd)
357 {
358 struct se_device *se_dev = cmd->se_dev;
359 struct fd_dev *fd_dev = FD_DEV(se_dev);
360 loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
361 sector_t nolb = sbc_get_write_same_sectors(cmd);
362 struct iov_iter iter;
363 struct bio_vec *bvec;
364 unsigned int len = 0, i;
365 ssize_t ret;
366
367 if (!nolb) {
368 target_complete_cmd(cmd, SAM_STAT_GOOD);
369 return 0;
370 }
371 if (cmd->prot_op) {
372 pr_err("WRITE_SAME: Protection information with FILEIO"
373 " backends not supported\n");
374 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
375 }
376
377 if (cmd->t_data_nents > 1 ||
378 cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) {
379 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
380 " block_size: %u\n",
381 cmd->t_data_nents,
382 cmd->t_data_sg[0].length,
383 cmd->se_dev->dev_attrib.block_size);
384 return TCM_INVALID_CDB_FIELD;
385 }
386
387 bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL);
388 if (!bvec)
389 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
390
391 for (i = 0; i < nolb; i++) {
392 bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]);
393 bvec[i].bv_len = cmd->t_data_sg[0].length;
394 bvec[i].bv_offset = cmd->t_data_sg[0].offset;
395
396 len += se_dev->dev_attrib.block_size;
397 }
398
399 iov_iter_bvec(&iter, ITER_BVEC, bvec, nolb, len);
400 ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos);
401
402 kfree(bvec);
403 if (ret < 0 || ret != len) {
404 pr_err("vfs_iter_write() returned %zd for write same\n", ret);
405 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
406 }
407
408 target_complete_cmd(cmd, SAM_STAT_GOOD);
409 return 0;
410 }
411
412 static int
413 fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb,
414 void *buf, size_t bufsize)
415 {
416 struct fd_dev *fd_dev = FD_DEV(se_dev);
417 struct file *prot_fd = fd_dev->fd_prot_file;
418 sector_t prot_length, prot;
419 loff_t pos = lba * se_dev->prot_length;
420
421 if (!prot_fd) {
422 pr_err("Unable to locate fd_dev->fd_prot_file\n");
423 return -ENODEV;
424 }
425
426 prot_length = nolb * se_dev->prot_length;
427
428 for (prot = 0; prot < prot_length;) {
429 sector_t len = min_t(sector_t, bufsize, prot_length - prot);
430 ssize_t ret = kernel_write(prot_fd, buf, len, pos + prot);
431
432 if (ret != len) {
433 pr_err("vfs_write to prot file failed: %zd\n", ret);
434 return ret < 0 ? ret : -ENODEV;
435 }
436 prot += ret;
437 }
438
439 return 0;
440 }
441
442 static int
443 fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
444 {
445 void *buf;
446 int rc;
447
448 buf = (void *)__get_free_page(GFP_KERNEL);
449 if (!buf) {
450 pr_err("Unable to allocate FILEIO prot buf\n");
451 return -ENOMEM;
452 }
453 memset(buf, 0xff, PAGE_SIZE);
454
455 rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE);
456
457 free_page((unsigned long)buf);
458
459 return rc;
460 }
461
462 static sense_reason_t
463 fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
464 {
465 struct file *file = FD_DEV(cmd->se_dev)->fd_file;
466 struct inode *inode = file->f_mapping->host;
467 int ret;
468
469 if (cmd->se_dev->dev_attrib.pi_prot_type) {
470 ret = fd_do_prot_unmap(cmd, lba, nolb);
471 if (ret)
472 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
473 }
474
475 if (S_ISBLK(inode->i_mode)) {
476 /* The backend is block device, use discard */
477 struct block_device *bdev = inode->i_bdev;
478 struct se_device *dev = cmd->se_dev;
479
480 ret = blkdev_issue_discard(bdev,
481 target_to_linux_sector(dev, lba),
482 target_to_linux_sector(dev, nolb),
483 GFP_KERNEL, 0);
484 if (ret < 0) {
485 pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n",
486 ret);
487 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
488 }
489 } else {
490 /* The backend is normal file, use fallocate */
491 struct se_device *se_dev = cmd->se_dev;
492 loff_t pos = lba * se_dev->dev_attrib.block_size;
493 unsigned int len = nolb * se_dev->dev_attrib.block_size;
494 int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
495
496 if (!file->f_op->fallocate)
497 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
498
499 ret = file->f_op->fallocate(file, mode, pos, len);
500 if (ret < 0) {
501 pr_warn("FILEIO: fallocate() failed: %d\n", ret);
502 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
503 }
504 }
505
506 return 0;
507 }
508
509 static sense_reason_t
510 fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
511 enum dma_data_direction data_direction)
512 {
513 struct se_device *dev = cmd->se_dev;
514 struct fd_dev *fd_dev = FD_DEV(dev);
515 struct file *file = fd_dev->fd_file;
516 struct file *pfile = fd_dev->fd_prot_file;
517 sense_reason_t rc;
518 int ret = 0;
519 /*
520 * We are currently limited by the number of iovecs (2048) per
521 * single vfs_[writev,readv] call.
522 */
523 if (cmd->data_length > FD_MAX_BYTES) {
524 pr_err("FILEIO: Not able to process I/O of %u bytes due to"
525 "FD_MAX_BYTES: %u iovec count limitation\n",
526 cmd->data_length, FD_MAX_BYTES);
527 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
528 }
529 /*
530 * Call vectorized fileio functions to map struct scatterlist
531 * physical memory addresses to struct iovec virtual memory.
532 */
533 if (data_direction == DMA_FROM_DEVICE) {
534 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
535 ret = fd_do_rw(cmd, pfile, dev->prot_length,
536 cmd->t_prot_sg, cmd->t_prot_nents,
537 cmd->prot_length, 0);
538 if (ret < 0)
539 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
540 }
541
542 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
543 sgl, sgl_nents, cmd->data_length, 0);
544
545 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
546 u32 sectors = cmd->data_length >>
547 ilog2(dev->dev_attrib.block_size);
548
549 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
550 0, cmd->t_prot_sg, 0);
551 if (rc)
552 return rc;
553 }
554 } else {
555 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
556 u32 sectors = cmd->data_length >>
557 ilog2(dev->dev_attrib.block_size);
558
559 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
560 0, cmd->t_prot_sg, 0);
561 if (rc)
562 return rc;
563 }
564
565 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
566 sgl, sgl_nents, cmd->data_length, 1);
567 /*
568 * Perform implicit vfs_fsync_range() for fd_do_writev() ops
569 * for SCSI WRITEs with Forced Unit Access (FUA) set.
570 * Allow this to happen independent of WCE=0 setting.
571 */
572 if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) {
573 loff_t start = cmd->t_task_lba *
574 dev->dev_attrib.block_size;
575 loff_t end;
576
577 if (cmd->data_length)
578 end = start + cmd->data_length - 1;
579 else
580 end = LLONG_MAX;
581
582 vfs_fsync_range(fd_dev->fd_file, start, end, 1);
583 }
584
585 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
586 ret = fd_do_rw(cmd, pfile, dev->prot_length,
587 cmd->t_prot_sg, cmd->t_prot_nents,
588 cmd->prot_length, 1);
589 if (ret < 0)
590 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
591 }
592 }
593
594 if (ret < 0)
595 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
596
597 if (ret)
598 target_complete_cmd(cmd, SAM_STAT_GOOD);
599 return 0;
600 }
601
602 enum {
603 Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
604 };
605
606 static match_table_t tokens = {
607 {Opt_fd_dev_name, "fd_dev_name=%s"},
608 {Opt_fd_dev_size, "fd_dev_size=%s"},
609 {Opt_fd_buffered_io, "fd_buffered_io=%d"},
610 {Opt_err, NULL}
611 };
612
613 static ssize_t fd_set_configfs_dev_params(struct se_device *dev,
614 const char *page, ssize_t count)
615 {
616 struct fd_dev *fd_dev = FD_DEV(dev);
617 char *orig, *ptr, *arg_p, *opts;
618 substring_t args[MAX_OPT_ARGS];
619 int ret = 0, arg, token;
620
621 opts = kstrdup(page, GFP_KERNEL);
622 if (!opts)
623 return -ENOMEM;
624
625 orig = opts;
626
627 while ((ptr = strsep(&opts, ",\n")) != NULL) {
628 if (!*ptr)
629 continue;
630
631 token = match_token(ptr, tokens, args);
632 switch (token) {
633 case Opt_fd_dev_name:
634 if (match_strlcpy(fd_dev->fd_dev_name, &args[0],
635 FD_MAX_DEV_NAME) == 0) {
636 ret = -EINVAL;
637 break;
638 }
639 pr_debug("FILEIO: Referencing Path: %s\n",
640 fd_dev->fd_dev_name);
641 fd_dev->fbd_flags |= FBDF_HAS_PATH;
642 break;
643 case Opt_fd_dev_size:
644 arg_p = match_strdup(&args[0]);
645 if (!arg_p) {
646 ret = -ENOMEM;
647 break;
648 }
649 ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size);
650 kfree(arg_p);
651 if (ret < 0) {
652 pr_err("kstrtoull() failed for"
653 " fd_dev_size=\n");
654 goto out;
655 }
656 pr_debug("FILEIO: Referencing Size: %llu"
657 " bytes\n", fd_dev->fd_dev_size);
658 fd_dev->fbd_flags |= FBDF_HAS_SIZE;
659 break;
660 case Opt_fd_buffered_io:
661 ret = match_int(args, &arg);
662 if (ret)
663 goto out;
664 if (arg != 1) {
665 pr_err("bogus fd_buffered_io=%d value\n", arg);
666 ret = -EINVAL;
667 goto out;
668 }
669
670 pr_debug("FILEIO: Using buffered I/O"
671 " operations for struct fd_dev\n");
672
673 fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
674 break;
675 default:
676 break;
677 }
678 }
679
680 out:
681 kfree(orig);
682 return (!ret) ? count : ret;
683 }
684
685 static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b)
686 {
687 struct fd_dev *fd_dev = FD_DEV(dev);
688 ssize_t bl = 0;
689
690 bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
691 bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n",
692 fd_dev->fd_dev_name, fd_dev->fd_dev_size,
693 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ?
694 "Buffered-WCE" : "O_DSYNC");
695 return bl;
696 }
697
698 static sector_t fd_get_blocks(struct se_device *dev)
699 {
700 struct fd_dev *fd_dev = FD_DEV(dev);
701 struct file *f = fd_dev->fd_file;
702 struct inode *i = f->f_mapping->host;
703 unsigned long long dev_size;
704 /*
705 * When using a file that references an underlying struct block_device,
706 * ensure dev_size is always based on the current inode size in order
707 * to handle underlying block_device resize operations.
708 */
709 if (S_ISBLK(i->i_mode))
710 dev_size = i_size_read(i);
711 else
712 dev_size = fd_dev->fd_dev_size;
713
714 return div_u64(dev_size - dev->dev_attrib.block_size,
715 dev->dev_attrib.block_size);
716 }
717
718 static int fd_init_prot(struct se_device *dev)
719 {
720 struct fd_dev *fd_dev = FD_DEV(dev);
721 struct file *prot_file, *file = fd_dev->fd_file;
722 struct inode *inode;
723 int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
724 char buf[FD_MAX_DEV_PROT_NAME];
725
726 if (!file) {
727 pr_err("Unable to locate fd_dev->fd_file\n");
728 return -ENODEV;
729 }
730
731 inode = file->f_mapping->host;
732 if (S_ISBLK(inode->i_mode)) {
733 pr_err("FILEIO Protection emulation only supported on"
734 " !S_ISBLK\n");
735 return -ENOSYS;
736 }
737
738 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE)
739 flags &= ~O_DSYNC;
740
741 snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection",
742 fd_dev->fd_dev_name);
743
744 prot_file = filp_open(buf, flags, 0600);
745 if (IS_ERR(prot_file)) {
746 pr_err("filp_open(%s) failed\n", buf);
747 ret = PTR_ERR(prot_file);
748 return ret;
749 }
750 fd_dev->fd_prot_file = prot_file;
751
752 return 0;
753 }
754
755 static int fd_format_prot(struct se_device *dev)
756 {
757 unsigned char *buf;
758 int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size;
759 int ret;
760
761 if (!dev->dev_attrib.pi_prot_type) {
762 pr_err("Unable to format_prot while pi_prot_type == 0\n");
763 return -ENODEV;
764 }
765
766 buf = vzalloc(unit_size);
767 if (!buf) {
768 pr_err("Unable to allocate FILEIO prot buf\n");
769 return -ENOMEM;
770 }
771
772 pr_debug("Using FILEIO prot_length: %llu\n",
773 (unsigned long long)(dev->transport->get_blocks(dev) + 1) *
774 dev->prot_length);
775
776 memset(buf, 0xff, unit_size);
777 ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1,
778 buf, unit_size);
779 vfree(buf);
780 return ret;
781 }
782
783 static void fd_free_prot(struct se_device *dev)
784 {
785 struct fd_dev *fd_dev = FD_DEV(dev);
786
787 if (!fd_dev->fd_prot_file)
788 return;
789
790 filp_close(fd_dev->fd_prot_file, NULL);
791 fd_dev->fd_prot_file = NULL;
792 }
793
794 static struct sbc_ops fd_sbc_ops = {
795 .execute_rw = fd_execute_rw,
796 .execute_sync_cache = fd_execute_sync_cache,
797 .execute_write_same = fd_execute_write_same,
798 .execute_unmap = fd_execute_unmap,
799 };
800
801 static sense_reason_t
802 fd_parse_cdb(struct se_cmd *cmd)
803 {
804 return sbc_parse_cdb(cmd, &fd_sbc_ops);
805 }
806
807 static const struct target_backend_ops fileio_ops = {
808 .name = "fileio",
809 .inquiry_prod = "FILEIO",
810 .inquiry_rev = FD_VERSION,
811 .owner = THIS_MODULE,
812 .attach_hba = fd_attach_hba,
813 .detach_hba = fd_detach_hba,
814 .alloc_device = fd_alloc_device,
815 .configure_device = fd_configure_device,
816 .free_device = fd_free_device,
817 .parse_cdb = fd_parse_cdb,
818 .set_configfs_dev_params = fd_set_configfs_dev_params,
819 .show_configfs_dev_params = fd_show_configfs_dev_params,
820 .get_device_type = sbc_get_device_type,
821 .get_blocks = fd_get_blocks,
822 .init_prot = fd_init_prot,
823 .format_prot = fd_format_prot,
824 .free_prot = fd_free_prot,
825 .tb_dev_attrib_attrs = sbc_attrib_attrs,
826 };
827
828 static int __init fileio_module_init(void)
829 {
830 return transport_backend_register(&fileio_ops);
831 }
832
833 static void __exit fileio_module_exit(void)
834 {
835 target_backend_unregister(&fileio_ops);
836 }
837
838 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
839 MODULE_AUTHOR("nab@Linux-iSCSI.org");
840 MODULE_LICENSE("GPL");
841
842 module_init(fileio_module_init);
843 module_exit(fileio_module_exit);
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