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 <linux/uio.h>
36 #include <scsi/scsi_proto.h>
37 #include <asm/unaligned.h>
39 #include <target/target_core_base.h>
40 #include <target/target_core_backend.h>
42 #include "target_core_file.h"
44 static inline struct fd_dev *FD_DEV(struct se_device *dev)
46 return container_of(dev, struct fd_dev, dev);
49 static int fd_attach_hba(struct se_hba *hba, u32 host_id)
51 struct fd_host *fd_host;
53 fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL);
55 pr_err("Unable to allocate memory for struct fd_host\n");
59 fd_host->fd_host_id = host_id;
61 hba->hba_ptr = fd_host;
63 pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic"
64 " Target Core Stack %s\n", hba->hba_id, FD_VERSION,
66 pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n",
67 hba->hba_id, fd_host->fd_host_id);
72 static void fd_detach_hba(struct se_hba *hba)
74 struct fd_host *fd_host = hba->hba_ptr;
76 pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic"
77 " Target Core\n", hba->hba_id, fd_host->fd_host_id);
83 static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name)
85 struct fd_dev *fd_dev;
86 struct fd_host *fd_host = hba->hba_ptr;
88 fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL);
90 pr_err("Unable to allocate memory for struct fd_dev\n");
94 fd_dev->fd_host = fd_host;
96 pr_debug("FILEIO: Allocated fd_dev for %p\n", name);
101 static int fd_configure_device(struct se_device *dev)
103 struct fd_dev *fd_dev = FD_DEV(dev);
104 struct fd_host *fd_host = dev->se_hba->hba_ptr;
106 struct inode *inode = NULL;
107 int flags, ret = -EINVAL;
109 if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) {
110 pr_err("Missing fd_dev_name=\n");
115 * Use O_DSYNC by default instead of O_SYNC to forgo syncing
116 * of pure timestamp updates.
118 flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
121 * Optionally allow fd_buffered_io=1 to be enabled for people
122 * who want use the fs buffer cache as an WriteCache mechanism.
124 * This means that in event of a hard failure, there is a risk
125 * of silent data-loss if the SCSI client has *not* performed a
126 * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE
127 * to write-out the entire device cache.
129 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) {
130 pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n");
134 file = filp_open(fd_dev->fd_dev_name, flags, 0600);
136 pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name);
140 fd_dev->fd_file = file;
142 * If using a block backend with this struct file, we extract
143 * fd_dev->fd_[block,dev]_size from struct block_device.
145 * Otherwise, we use the passed fd_size= from configfs
147 inode = file->f_mapping->host;
148 if (S_ISBLK(inode->i_mode)) {
149 struct request_queue *q = bdev_get_queue(inode->i_bdev);
150 unsigned long long dev_size;
152 fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev);
154 * Determine the number of bytes from i_size_read() minus
155 * one (1) logical sector from underlying struct block_device
157 dev_size = (i_size_read(file->f_mapping->host) -
158 fd_dev->fd_block_size);
160 pr_debug("FILEIO: Using size: %llu bytes from struct"
161 " block_device blocks: %llu logical_block_size: %d\n",
162 dev_size, div_u64(dev_size, fd_dev->fd_block_size),
163 fd_dev->fd_block_size);
165 if (target_configure_unmap_from_queue(&dev->dev_attrib, q))
166 pr_debug("IFILE: BLOCK Discard support available,"
167 " disabled by default\n");
169 * Enable write same emulation for IBLOCK and use 0xFFFF as
170 * the smaller WRITE_SAME(10) only has a two-byte block count.
172 dev->dev_attrib.max_write_same_len = 0xFFFF;
174 if (blk_queue_nonrot(q))
175 dev->dev_attrib.is_nonrot = 1;
177 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
178 pr_err("FILEIO: Missing fd_dev_size="
179 " parameter, and no backing struct"
184 fd_dev->fd_block_size = FD_BLOCKSIZE;
186 * Limit UNMAP emulation to 8k Number of LBAs (NoLB)
188 dev->dev_attrib.max_unmap_lba_count = 0x2000;
190 * Currently hardcoded to 1 in Linux/SCSI code..
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;
197 * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB)
198 * based upon struct iovec limit for vfs_writev()
200 dev->dev_attrib.max_write_same_len = 0x1000;
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;
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;
214 fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
215 fd_dev->fd_queue_depth = dev->queue_depth;
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);
223 if (fd_dev->fd_file) {
224 filp_close(fd_dev->fd_file, NULL);
225 fd_dev->fd_file = NULL;
230 static void fd_dev_call_rcu(struct rcu_head *p)
232 struct se_device *dev = container_of(p, struct se_device, rcu_head);
233 struct fd_dev *fd_dev = FD_DEV(dev);
238 static void fd_free_device(struct se_device *dev)
240 struct fd_dev *fd_dev = FD_DEV(dev);
242 if (fd_dev->fd_file) {
243 filp_close(fd_dev->fd_file, NULL);
244 fd_dev->fd_file = NULL;
246 call_rcu(&dev->rcu_head, fd_dev_call_rcu);
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)
253 struct scatterlist *sg;
254 struct iov_iter iter;
255 struct bio_vec *bvec;
257 loff_t pos = (cmd->t_task_lba * block_size);
260 bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL);
262 pr_err("Unable to allocate fd_do_readv iov[]\n");
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;
274 iov_iter_bvec(&iter, ITER_BVEC, bvec, sgl_nents, len);
276 ret = vfs_iter_write(fd, &iter, &pos);
278 ret = vfs_iter_read(fd, &iter, &pos);
281 if (ret < 0 || ret != data_length) {
282 pr_err("%s() write returned %d\n", __func__, ret);
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
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,
302 pr_err("%s() returned %d for non S_ISBLK\n",
304 } else if (ret != data_length) {
307 * Probably some one truncate file under us.
308 * We must explicitly zero sg-pages to prevent
309 * expose uninizialized pages to userspace.
311 if (ret < data_length)
312 ret += iov_iter_zero(data_length - ret, &iter);
322 static sense_reason_t
323 fd_execute_sync_cache(struct se_cmd *cmd)
325 struct se_device *dev = cmd->se_dev;
326 struct fd_dev *fd_dev = FD_DEV(dev);
327 int immed = (cmd->t_task_cdb[1] & 0x2);
332 * If the Immediate bit is set, queue up the GOOD response
333 * for this SYNCHRONIZE_CACHE op
336 target_complete_cmd(cmd, SAM_STAT_GOOD);
339 * Determine if we will be flushing the entire device.
341 if (cmd->t_task_lba == 0 && cmd->data_length == 0) {
345 start = cmd->t_task_lba * dev->dev_attrib.block_size;
346 if (cmd->data_length)
347 end = start + cmd->data_length - 1;
352 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1);
354 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret);
360 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
362 target_complete_cmd(cmd, SAM_STAT_GOOD);
367 static sense_reason_t
368 fd_execute_write_same(struct se_cmd *cmd)
370 struct se_device *se_dev = cmd->se_dev;
371 struct fd_dev *fd_dev = FD_DEV(se_dev);
372 loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
373 sector_t nolb = sbc_get_write_same_sectors(cmd);
374 struct iov_iter iter;
375 struct bio_vec *bvec;
376 unsigned int len = 0, i;
380 target_complete_cmd(cmd, SAM_STAT_GOOD);
384 pr_err("WRITE_SAME: Protection information with FILEIO"
385 " backends not supported\n");
386 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
389 if (cmd->t_data_nents > 1 ||
390 cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) {
391 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
394 cmd->t_data_sg[0].length,
395 cmd->se_dev->dev_attrib.block_size);
396 return TCM_INVALID_CDB_FIELD;
399 bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL);
401 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
403 for (i = 0; i < nolb; i++) {
404 bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]);
405 bvec[i].bv_len = cmd->t_data_sg[0].length;
406 bvec[i].bv_offset = cmd->t_data_sg[0].offset;
408 len += se_dev->dev_attrib.block_size;
411 iov_iter_bvec(&iter, ITER_BVEC, bvec, nolb, len);
412 ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos);
415 if (ret < 0 || ret != len) {
416 pr_err("vfs_iter_write() returned %zd for write same\n", ret);
417 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
420 target_complete_cmd(cmd, SAM_STAT_GOOD);
425 fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb,
426 void *buf, size_t bufsize)
428 struct fd_dev *fd_dev = FD_DEV(se_dev);
429 struct file *prot_fd = fd_dev->fd_prot_file;
430 sector_t prot_length, prot;
431 loff_t pos = lba * se_dev->prot_length;
434 pr_err("Unable to locate fd_dev->fd_prot_file\n");
438 prot_length = nolb * se_dev->prot_length;
440 for (prot = 0; prot < prot_length;) {
441 sector_t len = min_t(sector_t, bufsize, prot_length - prot);
442 ssize_t ret = kernel_write(prot_fd, buf, len, pos + prot);
445 pr_err("vfs_write to prot file failed: %zd\n", ret);
446 return ret < 0 ? ret : -ENODEV;
455 fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
460 buf = (void *)__get_free_page(GFP_KERNEL);
462 pr_err("Unable to allocate FILEIO prot buf\n");
465 memset(buf, 0xff, PAGE_SIZE);
467 rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE);
469 free_page((unsigned long)buf);
474 static sense_reason_t
475 fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb)
477 struct file *file = FD_DEV(cmd->se_dev)->fd_file;
478 struct inode *inode = file->f_mapping->host;
481 if (cmd->se_dev->dev_attrib.pi_prot_type) {
482 ret = fd_do_prot_unmap(cmd, lba, nolb);
484 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
487 if (S_ISBLK(inode->i_mode)) {
488 /* The backend is block device, use discard */
489 struct block_device *bdev = inode->i_bdev;
490 struct se_device *dev = cmd->se_dev;
492 ret = blkdev_issue_discard(bdev,
493 target_to_linux_sector(dev, lba),
494 target_to_linux_sector(dev, nolb),
497 pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n",
499 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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;
508 if (!file->f_op->fallocate)
509 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
511 ret = file->f_op->fallocate(file, mode, pos, len);
513 pr_warn("FILEIO: fallocate() failed: %d\n", ret);
514 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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)
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;
532 * We are currently limited by the number of iovecs (2048) per
533 * single vfs_[writev,readv] call.
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 limitation\n",
538 cmd->data_length, FD_MAX_BYTES);
539 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
542 * Call vectorized fileio functions to map struct scatterlist
543 * physical memory addresses to struct iovec virtual memory.
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);
551 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
554 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
555 sgl, sgl_nents, cmd->data_length, 0);
557 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type &&
558 dev->dev_attrib.pi_prot_verify) {
559 u32 sectors = cmd->data_length >>
560 ilog2(dev->dev_attrib.block_size);
562 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
563 0, cmd->t_prot_sg, 0);
568 if (cmd->prot_type && dev->dev_attrib.pi_prot_type &&
569 dev->dev_attrib.pi_prot_verify) {
570 u32 sectors = cmd->data_length >>
571 ilog2(dev->dev_attrib.block_size);
573 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors,
574 0, cmd->t_prot_sg, 0);
579 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size,
580 sgl, sgl_nents, cmd->data_length, 1);
582 * Perform implicit vfs_fsync_range() for fd_do_writev() ops
583 * for SCSI WRITEs with Forced Unit Access (FUA) set.
584 * Allow this to happen independent of WCE=0 setting.
586 if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) {
587 loff_t start = cmd->t_task_lba *
588 dev->dev_attrib.block_size;
591 if (cmd->data_length)
592 end = start + cmd->data_length - 1;
596 vfs_fsync_range(fd_dev->fd_file, start, end, 1);
599 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) {
600 ret = fd_do_rw(cmd, pfile, dev->prot_length,
601 cmd->t_prot_sg, cmd->t_prot_nents,
602 cmd->prot_length, 1);
604 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
609 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
611 target_complete_cmd(cmd, SAM_STAT_GOOD);
616 Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err
619 static match_table_t tokens = {
620 {Opt_fd_dev_name, "fd_dev_name=%s"},
621 {Opt_fd_dev_size, "fd_dev_size=%s"},
622 {Opt_fd_buffered_io, "fd_buffered_io=%d"},
626 static ssize_t fd_set_configfs_dev_params(struct se_device *dev,
627 const char *page, ssize_t count)
629 struct fd_dev *fd_dev = FD_DEV(dev);
630 char *orig, *ptr, *arg_p, *opts;
631 substring_t args[MAX_OPT_ARGS];
632 int ret = 0, arg, token;
634 opts = kstrdup(page, GFP_KERNEL);
640 while ((ptr = strsep(&opts, ",\n")) != NULL) {
644 token = match_token(ptr, tokens, args);
646 case Opt_fd_dev_name:
647 if (match_strlcpy(fd_dev->fd_dev_name, &args[0],
648 FD_MAX_DEV_NAME) == 0) {
652 pr_debug("FILEIO: Referencing Path: %s\n",
653 fd_dev->fd_dev_name);
654 fd_dev->fbd_flags |= FBDF_HAS_PATH;
656 case Opt_fd_dev_size:
657 arg_p = match_strdup(&args[0]);
662 ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size);
665 pr_err("kstrtoull() failed for"
669 pr_debug("FILEIO: Referencing Size: %llu"
670 " bytes\n", fd_dev->fd_dev_size);
671 fd_dev->fbd_flags |= FBDF_HAS_SIZE;
673 case Opt_fd_buffered_io:
674 ret = match_int(args, &arg);
678 pr_err("bogus fd_buffered_io=%d value\n", arg);
683 pr_debug("FILEIO: Using buffered I/O"
684 " operations for struct fd_dev\n");
686 fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE;
695 return (!ret) ? count : ret;
698 static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b)
700 struct fd_dev *fd_dev = FD_DEV(dev);
703 bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id);
704 bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n",
705 fd_dev->fd_dev_name, fd_dev->fd_dev_size,
706 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ?
707 "Buffered-WCE" : "O_DSYNC");
711 static sector_t fd_get_blocks(struct se_device *dev)
713 struct fd_dev *fd_dev = FD_DEV(dev);
714 struct file *f = fd_dev->fd_file;
715 struct inode *i = f->f_mapping->host;
716 unsigned long long dev_size;
718 * When using a file that references an underlying struct block_device,
719 * ensure dev_size is always based on the current inode size in order
720 * to handle underlying block_device resize operations.
722 if (S_ISBLK(i->i_mode))
723 dev_size = i_size_read(i);
725 dev_size = fd_dev->fd_dev_size;
727 return div_u64(dev_size - dev->dev_attrib.block_size,
728 dev->dev_attrib.block_size);
731 static int fd_init_prot(struct se_device *dev)
733 struct fd_dev *fd_dev = FD_DEV(dev);
734 struct file *prot_file, *file = fd_dev->fd_file;
736 int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
737 char buf[FD_MAX_DEV_PROT_NAME];
740 pr_err("Unable to locate fd_dev->fd_file\n");
744 inode = file->f_mapping->host;
745 if (S_ISBLK(inode->i_mode)) {
746 pr_err("FILEIO Protection emulation only supported on"
751 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE)
754 snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection",
755 fd_dev->fd_dev_name);
757 prot_file = filp_open(buf, flags, 0600);
758 if (IS_ERR(prot_file)) {
759 pr_err("filp_open(%s) failed\n", buf);
760 ret = PTR_ERR(prot_file);
763 fd_dev->fd_prot_file = prot_file;
768 static int fd_format_prot(struct se_device *dev)
771 int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size;
774 if (!dev->dev_attrib.pi_prot_type) {
775 pr_err("Unable to format_prot while pi_prot_type == 0\n");
779 buf = vzalloc(unit_size);
781 pr_err("Unable to allocate FILEIO prot buf\n");
785 pr_debug("Using FILEIO prot_length: %llu\n",
786 (unsigned long long)(dev->transport->get_blocks(dev) + 1) *
789 memset(buf, 0xff, unit_size);
790 ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1,
796 static void fd_free_prot(struct se_device *dev)
798 struct fd_dev *fd_dev = FD_DEV(dev);
800 if (!fd_dev->fd_prot_file)
803 filp_close(fd_dev->fd_prot_file, NULL);
804 fd_dev->fd_prot_file = NULL;
807 static struct sbc_ops fd_sbc_ops = {
808 .execute_rw = fd_execute_rw,
809 .execute_sync_cache = fd_execute_sync_cache,
810 .execute_write_same = fd_execute_write_same,
811 .execute_unmap = fd_execute_unmap,
814 static sense_reason_t
815 fd_parse_cdb(struct se_cmd *cmd)
817 return sbc_parse_cdb(cmd, &fd_sbc_ops);
820 static const struct target_backend_ops fileio_ops = {
822 .inquiry_prod = "FILEIO",
823 .inquiry_rev = FD_VERSION,
824 .owner = THIS_MODULE,
825 .attach_hba = fd_attach_hba,
826 .detach_hba = fd_detach_hba,
827 .alloc_device = fd_alloc_device,
828 .configure_device = fd_configure_device,
829 .free_device = fd_free_device,
830 .parse_cdb = fd_parse_cdb,
831 .set_configfs_dev_params = fd_set_configfs_dev_params,
832 .show_configfs_dev_params = fd_show_configfs_dev_params,
833 .get_device_type = sbc_get_device_type,
834 .get_blocks = fd_get_blocks,
835 .init_prot = fd_init_prot,
836 .format_prot = fd_format_prot,
837 .free_prot = fd_free_prot,
838 .tb_dev_attrib_attrs = sbc_attrib_attrs,
841 static int __init fileio_module_init(void)
843 return transport_backend_register(&fileio_ops);
846 static void __exit fileio_module_exit(void)
848 target_backend_unregister(&fileio_ops);
851 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
852 MODULE_AUTHOR("nab@Linux-iSCSI.org");
853 MODULE_LICENSE("GPL");
855 module_init(fileio_module_init);
856 module_exit(fileio_module_exit);