1 /*******************************************************************************
2 * Filename: target_core_file.c
4 * This file contains the Storage Engine <-> FILEIO transport specific functions
6 * (c) Copyright 2005-2013 Datera, Inc.
8 * Nicholas A. Bellinger <nab@kernel.org>
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.
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.
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.
24 ******************************************************************************/
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>
38 #include <target/target_core_base.h>
39 #include <target/target_core_backend.h>
41 #include "target_core_file.h"
43 static inline struct fd_dev *FD_DEV(struct se_device *dev)
45 return container_of(dev, struct fd_dev, dev);
48 static int fd_attach_hba(struct se_hba *hba, u32 host_id)
50 struct fd_host *fd_host;
52 fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
54 pr_err("Unable to allocate memory for struct fd_host\n");
58 fd_host->fd_host_id = host_id;
60 hba->hba_ptr = fd_host;
62 pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic"
63 " Target Core Stack %s\n", hba->hba_id, FD_VERSION,
65 pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n",
66 hba->hba_id, fd_host->fd_host_id);
71 static void fd_detach_hba(struct se_hba *hba)
73 struct fd_host *fd_host = hba->hba_ptr;
75 pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic"
76 " Target Core\n", hba->hba_id, fd_host->fd_host_id);
82 static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name)
84 struct fd_dev *fd_dev;
85 struct fd_host *fd_host = hba->hba_ptr;
87 fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
89 pr_err("Unable to allocate memory for struct fd_dev\n");
93 fd_dev->fd_host = fd_host;
95 pr_debug("FILEIO: Allocated fd_dev for %p\n", name);
100 static int fd_configure_device(struct se_device *dev)
102 struct fd_dev *fd_dev = FD_DEV(dev);
103 struct fd_host *fd_host = dev->se_hba->hba_ptr;
105 struct inode *inode = NULL;
106 int flags, ret = -EINVAL;
108 if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
109 pr_err("Missing fd_dev_name=\n");
114 * Use O_DSYNC by default instead of O_SYNC to forgo syncing
115 * of pure timestamp updates.
117 flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
120 * Optionally allow fd_buffered_io=1 to be enabled for people
121 * who want use the fs buffer cache as an WriteCache mechanism.
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.
128 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
129 pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n");
133 file = filp_open(fd_dev->fd_dev_name, flags, 0600);
135 pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name);
139 fd_dev->fd_file = file;
141 * If using a block backend with this struct file, we extract
142 * fd_dev->fd_[block,dev]_size from struct block_device.
144 * Otherwise, we use the passed fd_size= from configfs
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;
151 fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
153 * Determine the number of bytes from i_size_read() minus
154 * one (1) logical sector from underlying struct block_device
156 dev_size = (i_size_read(file->f_mapping->host) -
157 fd_dev->fd_block_size);
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);
164 if (target_configure_unmap_from_queue(&dev->dev_attrib, q))
165 pr_debug("IFILE: BLOCK Discard support available,"
166 " disabled by default\n");
168 * Enable write same emulation for IBLOCK and use 0xFFFF as
169 * the smaller WRITE_SAME(10) only has a two-byte block count.
171 dev->dev_attrib.max_write_same_len = 0xFFFF;
173 if (blk_queue_nonrot(q))
174 dev->dev_attrib.is_nonrot = 1;
176 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
177 pr_err("FILEIO: Missing fd_dev_size="
178 " parameter, and no backing struct"
183 fd_dev->fd_block_size = FD_BLOCKSIZE;
185 * Limit UNMAP emulation to 8k Number of LBAs (NoLB)
187 dev->dev_attrib.max_unmap_lba_count = 0x2000;
189 * Currently hardcoded to 1 in Linux/SCSI code..
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;
196 * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB)
197 * based upon struct iovec limit for vfs_writev()
199 dev->dev_attrib.max_write_same_len = 0x1000;
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;
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;
213 fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
214 fd_dev->fd_queue_depth = dev->queue_depth;
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);
222 if (fd_dev->fd_file) {
223 filp_close(fd_dev->fd_file, NULL);
224 fd_dev->fd_file = NULL;
229 static void fd_dev_call_rcu(struct rcu_head *p)
231 struct se_device *dev = container_of(p, struct se_device, rcu_head);
232 struct fd_dev *fd_dev = FD_DEV(dev);
237 static void fd_free_device(struct se_device *dev)
239 struct fd_dev *fd_dev = FD_DEV(dev);
241 if (fd_dev->fd_file) {
242 filp_close(fd_dev->fd_file, NULL);
243 fd_dev->fd_file = NULL;
245 call_rcu(&dev->rcu_head, fd_dev_call_rcu);
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)
252 struct scatterlist *sg;
253 struct iov_iter iter;
254 struct bio_vec *bvec;
256 loff_t pos = (cmd->t_task_lba * block_size);
259 bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
261 pr_err("Unable to allocate fd_do_readv iov[]\n");
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;
273 iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len);
275 ret = vfs_iter_write(fd, &iter, &pos);
277 ret = vfs_iter_read(fd, &iter, &pos);
280 if (ret < 0 || ret != data_length) {
281 pr_err("%s() write returned %d\n", __func__, ret);
287 * Return zeros and GOOD status even if the READ did not return
288 * the expected virt_size for struct file w/o a backing struct
291 if (S_ISBLK(file_inode(fd)->i_mode)) {
292 if (ret < 0 || ret != data_length) {
293 pr_err("%s() returned %d, expecting %u for "
294 "S_ISBLK\n", __func__, ret,
301 pr_err("%s() returned %d for non S_ISBLK\n",
303 } else if (ret != data_length) {
306 * Probably some one truncate file under us.
307 * We must explicitly zero sg-pages to prevent
308 * expose uninizialized pages to userspace.
310 if (ret < data_length)
311 ret += iov_iter_zero(data_length - ret, &iter);
321 static sense_reason_t
322 fd_execute_sync_cache(struct se_cmd *cmd)
324 struct se_device *dev = cmd->se_dev;
325 struct fd_dev *fd_dev = FD_DEV(dev);
326 int immed = (cmd->t_task_cdb[1] & 0x2);
331 * If the Immediate bit is set, queue up the GOOD response
332 * for this SYNCHRONIZE_CACHE op
335 target_complete_cmd(cmd, SAM_STAT_GOOD);
338 * Determine if we will be flushing the entire device.
340 if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
344 start = cmd->t_task_lba * dev->dev_attrib.block_size;
345 if (cmd->data_length)
346 end = start + cmd->data_length - 1;
351 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
353 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
359 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
361 target_complete_cmd(cmd, SAM_STAT_GOOD);
366 static sense_reason_t
367 fd_execute_write_same(struct se_cmd *cmd)
369 struct se_device *se_dev = cmd->se_dev;
370 struct fd_dev *fd_dev = FD_DEV(se_dev);
371 loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
372 sector_t nolb = sbc_get_write_same_sectors(cmd);
373 struct iov_iter iter;
374 struct bio_vec *bvec;
375 unsigned int len = 0, i;
379 target_complete_cmd(cmd, SAM_STAT_GOOD);
383 pr_err("WRITE_SAME: Protection information with FILEIO"
384 " backends not supported\n");
385 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
388 if (cmd->t_data_nents > 1 ||
389 cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) {
390 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
393 cmd->t_data_sg[0].length,
394 cmd->se_dev->dev_attrib.block_size);
395 return TCM_INVALID_CDB_FIELD;
398 bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL);
400 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
402 for (i = 0; i < nolb; i++) {
403 bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]);
404 bvec[i].bv_len = cmd->t_data_sg[0].length;
405 bvec[i].bv_offset = cmd->t_data_sg[0].offset;
407 len += se_dev->dev_attrib.block_size;
410 iov_iter_bvec(&iter, ITER_BVEC, bvec, nolb, len);
411 ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos);
414 if (ret < 0 || ret != len) {
415 pr_err("vfs_iter_write() returned %zd for write same\n", ret);
416 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
419 target_complete_cmd(cmd, SAM_STAT_GOOD);
424 fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb,
425 void *buf, size_t bufsize)
427 struct fd_dev *fd_dev = FD_DEV(se_dev);
428 struct file *prot_fd = fd_dev->fd_prot_file;
429 sector_t prot_length, prot;
430 loff_t pos = lba * se_dev->prot_length;
433 pr_err("Unable to locate fd_dev->fd_prot_file\n");
437 prot_length = nolb * se_dev->prot_length;
439 for (prot = 0; prot < prot_length;) {
440 sector_t len = min_t(sector_t, bufsize, prot_length - prot);
441 ssize_t ret = kernel_write(prot_fd, buf, len, pos + prot);
444 pr_err("vfs_write to prot file failed: %zd\n", ret);
445 return ret < 0 ? ret : -ENODEV;
454 fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
459 buf = (void *)__get_free_page(GFP_KERNEL);
461 pr_err("Unable to allocate FILEIO prot buf\n");
464 memset(buf, 0xff, PAGE_SIZE);
466 rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE);
468 free_page((unsigned long)buf);
473 static sense_reason_t
474 fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
476 struct file *file = FD_DEV(cmd->se_dev)->fd_file;
477 struct inode *inode = file->f_mapping->host;
484 if (cmd->se_dev->dev_attrib.pi_prot_type) {
485 ret = fd_do_prot_unmap(cmd, lba, nolb);
487 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
490 if (S_ISBLK(inode->i_mode)) {
491 /* The backend is block device, use discard */
492 struct block_device *bdev = inode->i_bdev;
493 struct se_device *dev = cmd->se_dev;
495 ret = blkdev_issue_discard(bdev,
496 target_to_linux_sector(dev, lba),
497 target_to_linux_sector(dev, nolb),
500 pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n",
502 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
505 /* The backend is normal file, use fallocate */
506 struct se_device *se_dev = cmd->se_dev;
507 loff_t pos = lba * se_dev->dev_attrib.block_size;
508 unsigned int len = nolb * se_dev->dev_attrib.block_size;
509 int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
511 if (!file->f_op->fallocate)
512 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
514 ret = file->f_op->fallocate(file, mode, pos, len);
516 pr_warn("FILEIO: fallocate() failed: %d\n", ret);
517 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
524 static sense_reason_t
525 fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
526 enum dma_data_direction data_direction)
528 struct se_device *dev = cmd->se_dev;
529 struct fd_dev *fd_dev = FD_DEV(dev);
530 struct file *file = fd_dev->fd_file;
531 struct file *pfile = fd_dev->fd_prot_file;
535 * We are currently limited by the number of iovecs (2048) per
536 * single vfs_[writev,readv] call.
538 if (cmd->data_length > FD_MAX_BYTES) {
539 pr_err("FILEIO: Not able to process I/O of %u bytes due to"
540 "FD_MAX_BYTES: %u iovec count limitation\n",
541 cmd->data_length, FD_MAX_BYTES);
542 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
545 * Call vectorized fileio functions to map struct scatterlist
546 * physical memory addresses to struct iovec virtual memory.
548 if (data_direction == DMA_FROM_DEVICE) {
549 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
550 ret = fd_do_rw(cmd, pfile, dev->prot_length,
551 cmd->t_prot_sg, cmd->t_prot_nents,
552 cmd->prot_length, 0);
554 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
557 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
558 sgl, sgl_nents, cmd->data_length, 0);
560 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
561 u32 sectors = cmd->data_length >>
562 ilog2(dev->dev_attrib.block_size);
564 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
565 0, cmd->t_prot_sg, 0);
570 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) {
571 u32 sectors = cmd->data_length >>
572 ilog2(dev->dev_attrib.block_size);
574 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
575 0, cmd->t_prot_sg, 0);
580 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
581 sgl, sgl_nents, cmd->data_length, 1);
583 * Perform implicit vfs_fsync_range() for fd_do_writev() ops
584 * for SCSI WRITEs with Forced Unit Access (FUA) set.
585 * Allow this to happen independent of WCE=0 setting.
587 if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) {
588 loff_t start = cmd->t_task_lba *
589 dev->dev_attrib.block_size;
592 if (cmd->data_length)
593 end = start + cmd->data_length - 1;
597 vfs_fsync_range(fd_dev->fd_file, start, end, 1);
600 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
601 ret = fd_do_rw(cmd, pfile, dev->prot_length,
602 cmd->t_prot_sg, cmd->t_prot_nents,
603 cmd->prot_length, 1);
605 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
610 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
612 target_complete_cmd(cmd, SAM_STAT_GOOD);
617 Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
620 static match_table_t tokens = {
621 {Opt_fd_dev_name, "fd_dev_name=%s"},
622 {Opt_fd_dev_size, "fd_dev_size=%s"},
623 {Opt_fd_buffered_io, "fd_buffered_io=%d"},
627 static ssize_t fd_set_configfs_dev_params(struct se_device *dev,
628 const char *page, ssize_t count)
630 struct fd_dev *fd_dev = FD_DEV(dev);
631 char *orig, *ptr, *arg_p, *opts;
632 substring_t args[MAX_OPT_ARGS];
633 int ret = 0, arg, token;
635 opts = kstrdup(page, GFP_KERNEL);
641 while ((ptr = strsep(&opts, ",\n")) != NULL) {
645 token = match_token(ptr, tokens, args);
647 case Opt_fd_dev_name:
648 if (match_strlcpy(fd_dev->fd_dev_name, &args[0],
649 FD_MAX_DEV_NAME) == 0) {
653 pr_debug("FILEIO: Referencing Path: %s\n",
654 fd_dev->fd_dev_name);
655 fd_dev->fbd_flags |= FBDF_HAS_PATH;
657 case Opt_fd_dev_size:
658 arg_p = match_strdup(&args[0]);
663 ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size);
666 pr_err("kstrtoull() failed for"
670 pr_debug("FILEIO: Referencing Size: %llu"
671 " bytes\n", fd_dev->fd_dev_size);
672 fd_dev->fbd_flags |= FBDF_HAS_SIZE;
674 case Opt_fd_buffered_io:
675 ret = match_int(args, &arg);
679 pr_err("bogus fd_buffered_io=%d value\n", arg);
684 pr_debug("FILEIO: Using buffered I/O"
685 " operations for struct fd_dev\n");
687 fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
696 return (!ret) ? count : ret;
699 static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b)
701 struct fd_dev *fd_dev = FD_DEV(dev);
704 bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
705 bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n",
706 fd_dev->fd_dev_name, fd_dev->fd_dev_size,
707 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ?
708 "Buffered-WCE" : "O_DSYNC");
712 static sector_t fd_get_blocks(struct se_device *dev)
714 struct fd_dev *fd_dev = FD_DEV(dev);
715 struct file *f = fd_dev->fd_file;
716 struct inode *i = f->f_mapping->host;
717 unsigned long long dev_size;
719 * When using a file that references an underlying struct block_device,
720 * ensure dev_size is always based on the current inode size in order
721 * to handle underlying block_device resize operations.
723 if (S_ISBLK(i->i_mode))
724 dev_size = i_size_read(i);
726 dev_size = fd_dev->fd_dev_size;
728 return div_u64(dev_size - dev->dev_attrib.block_size,
729 dev->dev_attrib.block_size);
732 static int fd_init_prot(struct se_device *dev)
734 struct fd_dev *fd_dev = FD_DEV(dev);
735 struct file *prot_file, *file = fd_dev->fd_file;
737 int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
738 char buf[FD_MAX_DEV_PROT_NAME];
741 pr_err("Unable to locate fd_dev->fd_file\n");
745 inode = file->f_mapping->host;
746 if (S_ISBLK(inode->i_mode)) {
747 pr_err("FILEIO Protection emulation only supported on"
752 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE)
755 snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection",
756 fd_dev->fd_dev_name);
758 prot_file = filp_open(buf, flags, 0600);
759 if (IS_ERR(prot_file)) {
760 pr_err("filp_open(%s) failed\n", buf);
761 ret = PTR_ERR(prot_file);
764 fd_dev->fd_prot_file = prot_file;
769 static int fd_format_prot(struct se_device *dev)
772 int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size;
775 if (!dev->dev_attrib.pi_prot_type) {
776 pr_err("Unable to format_prot while pi_prot_type == 0\n");
780 buf = vzalloc(unit_size);
782 pr_err("Unable to allocate FILEIO prot buf\n");
786 pr_debug("Using FILEIO prot_length: %llu\n",
787 (unsigned long long)(dev->transport->get_blocks(dev) + 1) *
790 memset(buf, 0xff, unit_size);
791 ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1,
797 static void fd_free_prot(struct se_device *dev)
799 struct fd_dev *fd_dev = FD_DEV(dev);
801 if (!fd_dev->fd_prot_file)
804 filp_close(fd_dev->fd_prot_file, NULL);
805 fd_dev->fd_prot_file = NULL;
808 static struct sbc_ops fd_sbc_ops = {
809 .execute_rw = fd_execute_rw,
810 .execute_sync_cache = fd_execute_sync_cache,
811 .execute_write_same = fd_execute_write_same,
812 .execute_unmap = fd_execute_unmap,
815 static sense_reason_t
816 fd_parse_cdb(struct se_cmd *cmd)
818 return sbc_parse_cdb(cmd, &fd_sbc_ops);
821 static const struct target_backend_ops fileio_ops = {
823 .inquiry_prod = "FILEIO",
824 .inquiry_rev = FD_VERSION,
825 .owner = THIS_MODULE,
826 .attach_hba = fd_attach_hba,
827 .detach_hba = fd_detach_hba,
828 .alloc_device = fd_alloc_device,
829 .configure_device = fd_configure_device,
830 .free_device = fd_free_device,
831 .parse_cdb = fd_parse_cdb,
832 .set_configfs_dev_params = fd_set_configfs_dev_params,
833 .show_configfs_dev_params = fd_show_configfs_dev_params,
834 .get_device_type = sbc_get_device_type,
835 .get_blocks = fd_get_blocks,
836 .init_prot = fd_init_prot,
837 .format_prot = fd_format_prot,
838 .free_prot = fd_free_prot,
839 .tb_dev_attrib_attrs = sbc_attrib_attrs,
842 static int __init fileio_module_init(void)
844 return transport_backend_register(&fileio_ops);
847 static void __exit fileio_module_exit(void)
849 target_backend_unregister(&fileio_ops);
852 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
853 MODULE_AUTHOR("nab@Linux-iSCSI.org");
854 MODULE_LICENSE("GPL");
856 module_init(fileio_module_init);
857 module_exit(fileio_module_exit);