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Merge branch 'x86-mm-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 2005-2012 RisingTide Systems LLC.
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/falloc.h>
34 #include <scsi/scsi.h>
35 #include <scsi/scsi_host.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 /* fd_attach_hba(): (Part of se_subsystem_api_t template)
49 *
50 *
51 */
52 static int fd_attach_hba(struct se_hba *hba, u32 host_id)
53 {
54 struct fd_host *fd_host;
55
56 fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
57 if (!fd_host) {
58 pr_err("Unable to allocate memory for struct fd_host\n");
59 return -ENOMEM;
60 }
61
62 fd_host->fd_host_id = host_id;
63
64 hba->hba_ptr = fd_host;
65
66 pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic"
67 " Target Core Stack %s\n", hba->hba_id, FD_VERSION,
68 TARGET_CORE_MOD_VERSION);
69 pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic"
70 " MaxSectors: %u\n",
71 hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS);
72
73 return 0;
74 }
75
76 static void fd_detach_hba(struct se_hba *hba)
77 {
78 struct fd_host *fd_host = hba->hba_ptr;
79
80 pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic"
81 " Target Core\n", hba->hba_id, fd_host->fd_host_id);
82
83 kfree(fd_host);
84 hba->hba_ptr = NULL;
85 }
86
87 static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name)
88 {
89 struct fd_dev *fd_dev;
90 struct fd_host *fd_host = hba->hba_ptr;
91
92 fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
93 if (!fd_dev) {
94 pr_err("Unable to allocate memory for struct fd_dev\n");
95 return NULL;
96 }
97
98 fd_dev->fd_host = fd_host;
99
100 pr_debug("FILEIO: Allocated fd_dev for %p\n", name);
101
102 return &fd_dev->dev;
103 }
104
105 static int fd_configure_device(struct se_device *dev)
106 {
107 struct fd_dev *fd_dev = FD_DEV(dev);
108 struct fd_host *fd_host = dev->se_hba->hba_ptr;
109 struct file *file;
110 struct inode *inode = NULL;
111 int flags, ret = -EINVAL;
112
113 if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
114 pr_err("Missing fd_dev_name=\n");
115 return -EINVAL;
116 }
117
118 /*
119 * Use O_DSYNC by default instead of O_SYNC to forgo syncing
120 * of pure timestamp updates.
121 */
122 flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
123
124 /*
125 * Optionally allow fd_buffered_io=1 to be enabled for people
126 * who want use the fs buffer cache as an WriteCache mechanism.
127 *
128 * This means that in event of a hard failure, there is a risk
129 * of silent data-loss if the SCSI client has *not* performed a
130 * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE
131 * to write-out the entire device cache.
132 */
133 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
134 pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n");
135 flags &= ~O_DSYNC;
136 }
137
138 file = filp_open(fd_dev->fd_dev_name, flags, 0600);
139 if (IS_ERR(file)) {
140 pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name);
141 ret = PTR_ERR(file);
142 goto fail;
143 }
144 fd_dev->fd_file = file;
145 /*
146 * If using a block backend with this struct file, we extract
147 * fd_dev->fd_[block,dev]_size from struct block_device.
148 *
149 * Otherwise, we use the passed fd_size= from configfs
150 */
151 inode = file->f_mapping->host;
152 if (S_ISBLK(inode->i_mode)) {
153 struct request_queue *q = bdev_get_queue(inode->i_bdev);
154 unsigned long long dev_size;
155
156 fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
157 /*
158 * Determine the number of bytes from i_size_read() minus
159 * one (1) logical sector from underlying struct block_device
160 */
161 dev_size = (i_size_read(file->f_mapping->host) -
162 fd_dev->fd_block_size);
163
164 pr_debug("FILEIO: Using size: %llu bytes from struct"
165 " block_device blocks: %llu logical_block_size: %d\n",
166 dev_size, div_u64(dev_size, fd_dev->fd_block_size),
167 fd_dev->fd_block_size);
168 /*
169 * Check if the underlying struct block_device request_queue supports
170 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
171 * in ATA and we need to set TPE=1
172 */
173 if (blk_queue_discard(q)) {
174 dev->dev_attrib.max_unmap_lba_count =
175 q->limits.max_discard_sectors;
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 =
181 q->limits.discard_granularity >> 9;
182 dev->dev_attrib.unmap_granularity_alignment =
183 q->limits.discard_alignment;
184 pr_debug("IFILE: BLOCK Discard support available,"
185 " disabled by default\n");
186 }
187 /*
188 * Enable write same emulation for IBLOCK and use 0xFFFF as
189 * the smaller WRITE_SAME(10) only has a two-byte block count.
190 */
191 dev->dev_attrib.max_write_same_len = 0xFFFF;
192
193 if (blk_queue_nonrot(q))
194 dev->dev_attrib.is_nonrot = 1;
195 } else {
196 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
197 pr_err("FILEIO: Missing fd_dev_size="
198 " parameter, and no backing struct"
199 " block_device\n");
200 goto fail;
201 }
202
203 fd_dev->fd_block_size = FD_BLOCKSIZE;
204 /*
205 * Limit UNMAP emulation to 8k Number of LBAs (NoLB)
206 */
207 dev->dev_attrib.max_unmap_lba_count = 0x2000;
208 /*
209 * Currently hardcoded to 1 in Linux/SCSI code..
210 */
211 dev->dev_attrib.max_unmap_block_desc_count = 1;
212 dev->dev_attrib.unmap_granularity = 1;
213 dev->dev_attrib.unmap_granularity_alignment = 0;
214
215 /*
216 * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB)
217 * based upon struct iovec limit for vfs_writev()
218 */
219 dev->dev_attrib.max_write_same_len = 0x1000;
220 }
221
222 dev->dev_attrib.hw_block_size = fd_dev->fd_block_size;
223 dev->dev_attrib.hw_max_sectors = FD_MAX_SECTORS;
224 dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH;
225
226 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
227 pr_debug("FILEIO: Forcing setting of emulate_write_cache=1"
228 " with FDBD_HAS_BUFFERED_IO_WCE\n");
229 dev->dev_attrib.emulate_write_cache = 1;
230 }
231
232 fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
233 fd_dev->fd_queue_depth = dev->queue_depth;
234
235 pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
236 " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
237 fd_dev->fd_dev_name, fd_dev->fd_dev_size);
238
239 return 0;
240 fail:
241 if (fd_dev->fd_file) {
242 filp_close(fd_dev->fd_file, NULL);
243 fd_dev->fd_file = NULL;
244 }
245 return ret;
246 }
247
248 static void fd_free_device(struct se_device *dev)
249 {
250 struct fd_dev *fd_dev = FD_DEV(dev);
251
252 if (fd_dev->fd_file) {
253 filp_close(fd_dev->fd_file, NULL);
254 fd_dev->fd_file = NULL;
255 }
256
257 kfree(fd_dev);
258 }
259
260 static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl,
261 u32 sgl_nents, int is_write)
262 {
263 struct se_device *se_dev = cmd->se_dev;
264 struct fd_dev *dev = FD_DEV(se_dev);
265 struct file *fd = dev->fd_file;
266 struct scatterlist *sg;
267 struct iovec *iov;
268 mm_segment_t old_fs;
269 loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size);
270 int ret = 0, i;
271
272 iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL);
273 if (!iov) {
274 pr_err("Unable to allocate fd_do_readv iov[]\n");
275 return -ENOMEM;
276 }
277
278 for_each_sg(sgl, sg, sgl_nents, i) {
279 iov[i].iov_len = sg->length;
280 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset;
281 }
282
283 old_fs = get_fs();
284 set_fs(get_ds());
285
286 if (is_write)
287 ret = vfs_writev(fd, &iov[0], sgl_nents, &pos);
288 else
289 ret = vfs_readv(fd, &iov[0], sgl_nents, &pos);
290
291 set_fs(old_fs);
292
293 for_each_sg(sgl, sg, sgl_nents, i)
294 kunmap(sg_page(sg));
295
296 kfree(iov);
297
298 if (is_write) {
299 if (ret < 0 || ret != cmd->data_length) {
300 pr_err("%s() write returned %d\n", __func__, ret);
301 return (ret < 0 ? ret : -EINVAL);
302 }
303 } else {
304 /*
305 * Return zeros and GOOD status even if the READ did not return
306 * the expected virt_size for struct file w/o a backing struct
307 * block_device.
308 */
309 if (S_ISBLK(file_inode(fd)->i_mode)) {
310 if (ret < 0 || ret != cmd->data_length) {
311 pr_err("%s() returned %d, expecting %u for "
312 "S_ISBLK\n", __func__, ret,
313 cmd->data_length);
314 return (ret < 0 ? ret : -EINVAL);
315 }
316 } else {
317 if (ret < 0) {
318 pr_err("%s() returned %d for non S_ISBLK\n",
319 __func__, ret);
320 return ret;
321 }
322 }
323 }
324 return 1;
325 }
326
327 static sense_reason_t
328 fd_execute_sync_cache(struct se_cmd *cmd)
329 {
330 struct se_device *dev = cmd->se_dev;
331 struct fd_dev *fd_dev = FD_DEV(dev);
332 int immed = (cmd->t_task_cdb[1] & 0x2);
333 loff_t start, end;
334 int ret;
335
336 /*
337 * If the Immediate bit is set, queue up the GOOD response
338 * for this SYNCHRONIZE_CACHE op
339 */
340 if (immed)
341 target_complete_cmd(cmd, SAM_STAT_GOOD);
342
343 /*
344 * Determine if we will be flushing the entire device.
345 */
346 if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
347 start = 0;
348 end = LLONG_MAX;
349 } else {
350 start = cmd->t_task_lba * dev->dev_attrib.block_size;
351 if (cmd->data_length)
352 end = start + cmd->data_length;
353 else
354 end = LLONG_MAX;
355 }
356
357 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
358 if (ret != 0)
359 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
360
361 if (immed)
362 return 0;
363
364 if (ret)
365 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
366 else
367 target_complete_cmd(cmd, SAM_STAT_GOOD);
368
369 return 0;
370 }
371
372 static unsigned char *
373 fd_setup_write_same_buf(struct se_cmd *cmd, struct scatterlist *sg,
374 unsigned int len)
375 {
376 struct se_device *se_dev = cmd->se_dev;
377 unsigned int block_size = se_dev->dev_attrib.block_size;
378 unsigned int i = 0, end;
379 unsigned char *buf, *p, *kmap_buf;
380
381 buf = kzalloc(min_t(unsigned int, len, PAGE_SIZE), GFP_KERNEL);
382 if (!buf) {
383 pr_err("Unable to allocate fd_execute_write_same buf\n");
384 return NULL;
385 }
386
387 kmap_buf = kmap(sg_page(sg)) + sg->offset;
388 if (!kmap_buf) {
389 pr_err("kmap() failed in fd_setup_write_same\n");
390 kfree(buf);
391 return NULL;
392 }
393 /*
394 * Fill local *buf to contain multiple WRITE_SAME blocks up to
395 * min(len, PAGE_SIZE)
396 */
397 p = buf;
398 end = min_t(unsigned int, len, PAGE_SIZE);
399
400 while (i < end) {
401 memcpy(p, kmap_buf, block_size);
402
403 i += block_size;
404 p += block_size;
405 }
406 kunmap(sg_page(sg));
407
408 return buf;
409 }
410
411 static sense_reason_t
412 fd_execute_write_same(struct se_cmd *cmd)
413 {
414 struct se_device *se_dev = cmd->se_dev;
415 struct fd_dev *fd_dev = FD_DEV(se_dev);
416 struct file *f = fd_dev->fd_file;
417 struct scatterlist *sg;
418 struct iovec *iov;
419 mm_segment_t old_fs;
420 sector_t nolb = sbc_get_write_same_sectors(cmd);
421 loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
422 unsigned int len, len_tmp, iov_num;
423 int i, rc;
424 unsigned char *buf;
425
426 if (!nolb) {
427 target_complete_cmd(cmd, SAM_STAT_GOOD);
428 return 0;
429 }
430 sg = &cmd->t_data_sg[0];
431
432 if (cmd->t_data_nents > 1 ||
433 sg->length != cmd->se_dev->dev_attrib.block_size) {
434 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
435 " block_size: %u\n", cmd->t_data_nents, sg->length,
436 cmd->se_dev->dev_attrib.block_size);
437 return TCM_INVALID_CDB_FIELD;
438 }
439
440 len = len_tmp = nolb * se_dev->dev_attrib.block_size;
441 iov_num = DIV_ROUND_UP(len, PAGE_SIZE);
442
443 buf = fd_setup_write_same_buf(cmd, sg, len);
444 if (!buf)
445 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
446
447 iov = vzalloc(sizeof(struct iovec) * iov_num);
448 if (!iov) {
449 pr_err("Unable to allocate fd_execute_write_same iovecs\n");
450 kfree(buf);
451 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
452 }
453 /*
454 * Map the single fabric received scatterlist block now populated
455 * in *buf into each iovec for I/O submission.
456 */
457 for (i = 0; i < iov_num; i++) {
458 iov[i].iov_base = buf;
459 iov[i].iov_len = min_t(unsigned int, len_tmp, PAGE_SIZE);
460 len_tmp -= iov[i].iov_len;
461 }
462
463 old_fs = get_fs();
464 set_fs(get_ds());
465 rc = vfs_writev(f, &iov[0], iov_num, &pos);
466 set_fs(old_fs);
467
468 vfree(iov);
469 kfree(buf);
470
471 if (rc < 0 || rc != len) {
472 pr_err("vfs_writev() returned %d for write same\n", rc);
473 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
474 }
475
476 target_complete_cmd(cmd, SAM_STAT_GOOD);
477 return 0;
478 }
479
480 static sense_reason_t
481 fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb)
482 {
483 struct file *file = priv;
484 struct inode *inode = file->f_mapping->host;
485 int ret;
486
487 if (S_ISBLK(inode->i_mode)) {
488 /* The backend is block device, use discard */
489 struct block_device *bdev = inode->i_bdev;
490
491 ret = blkdev_issue_discard(bdev, lba,
492 nolb, GFP_KERNEL, 0);
493 if (ret < 0) {
494 pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n",
495 ret);
496 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
497 }
498 } else {
499 /* The backend is normal file, use fallocate */
500 struct se_device *se_dev = cmd->se_dev;
501 loff_t pos = lba * se_dev->dev_attrib.block_size;
502 unsigned int len = nolb * se_dev->dev_attrib.block_size;
503 int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
504
505 if (!file->f_op->fallocate)
506 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
507
508 ret = file->f_op->fallocate(file, mode, pos, len);
509 if (ret < 0) {
510 pr_warn("FILEIO: fallocate() failed: %d\n", ret);
511 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
512 }
513 }
514
515 return 0;
516 }
517
518 static sense_reason_t
519 fd_execute_write_same_unmap(struct se_cmd *cmd)
520 {
521 struct se_device *se_dev = cmd->se_dev;
522 struct fd_dev *fd_dev = FD_DEV(se_dev);
523 struct file *file = fd_dev->fd_file;
524 sector_t lba = cmd->t_task_lba;
525 sector_t nolb = sbc_get_write_same_sectors(cmd);
526 int ret;
527
528 if (!nolb) {
529 target_complete_cmd(cmd, SAM_STAT_GOOD);
530 return 0;
531 }
532
533 ret = fd_do_unmap(cmd, file, lba, nolb);
534 if (ret)
535 return ret;
536
537 target_complete_cmd(cmd, GOOD);
538 return 0;
539 }
540
541 static sense_reason_t
542 fd_execute_unmap(struct se_cmd *cmd)
543 {
544 struct file *file = FD_DEV(cmd->se_dev)->fd_file;
545
546 return sbc_execute_unmap(cmd, fd_do_unmap, file);
547 }
548
549 static sense_reason_t
550 fd_execute_rw(struct se_cmd *cmd)
551 {
552 struct scatterlist *sgl = cmd->t_data_sg;
553 u32 sgl_nents = cmd->t_data_nents;
554 enum dma_data_direction data_direction = cmd->data_direction;
555 struct se_device *dev = cmd->se_dev;
556 int ret = 0;
557
558 /*
559 * Call vectorized fileio functions to map struct scatterlist
560 * physical memory addresses to struct iovec virtual memory.
561 */
562 if (data_direction == DMA_FROM_DEVICE) {
563 ret = fd_do_rw(cmd, sgl, sgl_nents, 0);
564 } else {
565 ret = fd_do_rw(cmd, sgl, sgl_nents, 1);
566 /*
567 * Perform implict vfs_fsync_range() for fd_do_writev() ops
568 * for SCSI WRITEs with Forced Unit Access (FUA) set.
569 * Allow this to happen independent of WCE=0 setting.
570 */
571 if (ret > 0 &&
572 dev->dev_attrib.emulate_fua_write > 0 &&
573 (cmd->se_cmd_flags & SCF_FUA)) {
574 struct fd_dev *fd_dev = FD_DEV(dev);
575 loff_t start = cmd->t_task_lba *
576 dev->dev_attrib.block_size;
577 loff_t end = start + cmd->data_length;
578
579 vfs_fsync_range(fd_dev->fd_file, start, end, 1);
580 }
581 }
582
583 if (ret < 0)
584 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
585
586 if (ret)
587 target_complete_cmd(cmd, SAM_STAT_GOOD);
588 return 0;
589 }
590
591 enum {
592 Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
593 };
594
595 static match_table_t tokens = {
596 {Opt_fd_dev_name, "fd_dev_name=%s"},
597 {Opt_fd_dev_size, "fd_dev_size=%s"},
598 {Opt_fd_buffered_io, "fd_buffered_io=%d"},
599 {Opt_err, NULL}
600 };
601
602 static ssize_t fd_set_configfs_dev_params(struct se_device *dev,
603 const char *page, ssize_t count)
604 {
605 struct fd_dev *fd_dev = FD_DEV(dev);
606 char *orig, *ptr, *arg_p, *opts;
607 substring_t args[MAX_OPT_ARGS];
608 int ret = 0, arg, token;
609
610 opts = kstrdup(page, GFP_KERNEL);
611 if (!opts)
612 return -ENOMEM;
613
614 orig = opts;
615
616 while ((ptr = strsep(&opts, ",\n")) != NULL) {
617 if (!*ptr)
618 continue;
619
620 token = match_token(ptr, tokens, args);
621 switch (token) {
622 case Opt_fd_dev_name:
623 if (match_strlcpy(fd_dev->fd_dev_name, &args[0],
624 FD_MAX_DEV_NAME) == 0) {
625 ret = -EINVAL;
626 break;
627 }
628 pr_debug("FILEIO: Referencing Path: %s\n",
629 fd_dev->fd_dev_name);
630 fd_dev->fbd_flags |= FBDF_HAS_PATH;
631 break;
632 case Opt_fd_dev_size:
633 arg_p = match_strdup(&args[0]);
634 if (!arg_p) {
635 ret = -ENOMEM;
636 break;
637 }
638 ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size);
639 kfree(arg_p);
640 if (ret < 0) {
641 pr_err("strict_strtoull() failed for"
642 " fd_dev_size=\n");
643 goto out;
644 }
645 pr_debug("FILEIO: Referencing Size: %llu"
646 " bytes\n", fd_dev->fd_dev_size);
647 fd_dev->fbd_flags |= FBDF_HAS_SIZE;
648 break;
649 case Opt_fd_buffered_io:
650 match_int(args, &arg);
651 if (arg != 1) {
652 pr_err("bogus fd_buffered_io=%d value\n", arg);
653 ret = -EINVAL;
654 goto out;
655 }
656
657 pr_debug("FILEIO: Using buffered I/O"
658 " operations for struct fd_dev\n");
659
660 fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
661 break;
662 default:
663 break;
664 }
665 }
666
667 out:
668 kfree(orig);
669 return (!ret) ? count : ret;
670 }
671
672 static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b)
673 {
674 struct fd_dev *fd_dev = FD_DEV(dev);
675 ssize_t bl = 0;
676
677 bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
678 bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n",
679 fd_dev->fd_dev_name, fd_dev->fd_dev_size,
680 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ?
681 "Buffered-WCE" : "O_DSYNC");
682 return bl;
683 }
684
685 static sector_t fd_get_blocks(struct se_device *dev)
686 {
687 struct fd_dev *fd_dev = FD_DEV(dev);
688 struct file *f = fd_dev->fd_file;
689 struct inode *i = f->f_mapping->host;
690 unsigned long long dev_size;
691 /*
692 * When using a file that references an underlying struct block_device,
693 * ensure dev_size is always based on the current inode size in order
694 * to handle underlying block_device resize operations.
695 */
696 if (S_ISBLK(i->i_mode))
697 dev_size = i_size_read(i);
698 else
699 dev_size = fd_dev->fd_dev_size;
700
701 return div_u64(dev_size - dev->dev_attrib.block_size,
702 dev->dev_attrib.block_size);
703 }
704
705 static struct sbc_ops fd_sbc_ops = {
706 .execute_rw = fd_execute_rw,
707 .execute_sync_cache = fd_execute_sync_cache,
708 .execute_write_same = fd_execute_write_same,
709 .execute_write_same_unmap = fd_execute_write_same_unmap,
710 .execute_unmap = fd_execute_unmap,
711 };
712
713 static sense_reason_t
714 fd_parse_cdb(struct se_cmd *cmd)
715 {
716 return sbc_parse_cdb(cmd, &fd_sbc_ops);
717 }
718
719 static struct se_subsystem_api fileio_template = {
720 .name = "fileio",
721 .inquiry_prod = "FILEIO",
722 .inquiry_rev = FD_VERSION,
723 .owner = THIS_MODULE,
724 .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV,
725 .attach_hba = fd_attach_hba,
726 .detach_hba = fd_detach_hba,
727 .alloc_device = fd_alloc_device,
728 .configure_device = fd_configure_device,
729 .free_device = fd_free_device,
730 .parse_cdb = fd_parse_cdb,
731 .set_configfs_dev_params = fd_set_configfs_dev_params,
732 .show_configfs_dev_params = fd_show_configfs_dev_params,
733 .get_device_type = sbc_get_device_type,
734 .get_blocks = fd_get_blocks,
735 };
736
737 static int __init fileio_module_init(void)
738 {
739 return transport_subsystem_register(&fileio_template);
740 }
741
742 static void __exit fileio_module_exit(void)
743 {
744 transport_subsystem_release(&fileio_template);
745 }
746
747 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
748 MODULE_AUTHOR("nab@Linux-iSCSI.org");
749 MODULE_LICENSE("GPL");
750
751 module_init(fileio_module_init);
752 module_exit(fileio_module_exit);
Linux kernel - Deliverables
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