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 call_rcu(&dev
->rcu_head
, fd_dev_call_rcu
);
243 static void fd_destroy_device(struct se_device
*dev
)
245 struct fd_dev
*fd_dev
= FD_DEV(dev
);
247 if (fd_dev
->fd_file
) {
248 filp_close(fd_dev
->fd_file
, NULL
);
249 fd_dev
->fd_file
= NULL
;
253 static int fd_do_rw(struct se_cmd
*cmd
, struct file
*fd
,
254 u32 block_size
, struct scatterlist
*sgl
,
255 u32 sgl_nents
, u32 data_length
, int is_write
)
257 struct scatterlist
*sg
;
258 struct iov_iter iter
;
259 struct bio_vec
*bvec
;
261 loff_t pos
= (cmd
->t_task_lba
* block_size
);
264 bvec
= kcalloc(sgl_nents
, sizeof(struct bio_vec
), GFP_KERNEL
);
266 pr_err("Unable to allocate fd_do_readv iov[]\n");
270 for_each_sg(sgl
, sg
, sgl_nents
, i
) {
271 bvec
[i
].bv_page
= sg_page(sg
);
272 bvec
[i
].bv_len
= sg
->length
;
273 bvec
[i
].bv_offset
= sg
->offset
;
278 iov_iter_bvec(&iter
, ITER_BVEC
, bvec
, sgl_nents
, len
);
280 ret
= vfs_iter_write(fd
, &iter
, &pos
, 0);
282 ret
= vfs_iter_read(fd
, &iter
, &pos
, 0);
285 if (ret
< 0 || ret
!= data_length
) {
286 pr_err("%s() write returned %d\n", __func__
, ret
);
292 * Return zeros and GOOD status even if the READ did not return
293 * the expected virt_size for struct file w/o a backing struct
296 if (S_ISBLK(file_inode(fd
)->i_mode
)) {
297 if (ret
< 0 || ret
!= data_length
) {
298 pr_err("%s() returned %d, expecting %u for "
299 "S_ISBLK\n", __func__
, ret
,
306 pr_err("%s() returned %d for non S_ISBLK\n",
308 } else if (ret
!= data_length
) {
311 * Probably some one truncate file under us.
312 * We must explicitly zero sg-pages to prevent
313 * expose uninizialized pages to userspace.
315 if (ret
< data_length
)
316 ret
+= iov_iter_zero(data_length
- ret
, &iter
);
326 static sense_reason_t
327 fd_execute_sync_cache(struct se_cmd
*cmd
)
329 struct se_device
*dev
= cmd
->se_dev
;
330 struct fd_dev
*fd_dev
= FD_DEV(dev
);
331 int immed
= (cmd
->t_task_cdb
[1] & 0x2);
336 * If the Immediate bit is set, queue up the GOOD response
337 * for this SYNCHRONIZE_CACHE op
340 target_complete_cmd(cmd
, SAM_STAT_GOOD
);
343 * Determine if we will be flushing the entire device.
345 if (cmd
->t_task_lba
== 0 && cmd
->data_length
== 0) {
349 start
= cmd
->t_task_lba
* dev
->dev_attrib
.block_size
;
350 if (cmd
->data_length
)
351 end
= start
+ cmd
->data_length
- 1;
356 ret
= vfs_fsync_range(fd_dev
->fd_file
, start
, end
, 1);
358 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret
);
364 target_complete_cmd(cmd
, SAM_STAT_CHECK_CONDITION
);
366 target_complete_cmd(cmd
, SAM_STAT_GOOD
);
371 static sense_reason_t
372 fd_execute_write_same(struct se_cmd
*cmd
)
374 struct se_device
*se_dev
= cmd
->se_dev
;
375 struct fd_dev
*fd_dev
= FD_DEV(se_dev
);
376 loff_t pos
= cmd
->t_task_lba
* se_dev
->dev_attrib
.block_size
;
377 sector_t nolb
= sbc_get_write_same_sectors(cmd
);
378 struct iov_iter iter
;
379 struct bio_vec
*bvec
;
380 unsigned int len
= 0, i
;
384 target_complete_cmd(cmd
, SAM_STAT_GOOD
);
388 pr_err("WRITE_SAME: Protection information with FILEIO"
389 " backends not supported\n");
390 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
393 if (cmd
->t_data_nents
> 1 ||
394 cmd
->t_data_sg
[0].length
!= cmd
->se_dev
->dev_attrib
.block_size
) {
395 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
398 cmd
->t_data_sg
[0].length
,
399 cmd
->se_dev
->dev_attrib
.block_size
);
400 return TCM_INVALID_CDB_FIELD
;
403 bvec
= kcalloc(nolb
, sizeof(struct bio_vec
), GFP_KERNEL
);
405 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
407 for (i
= 0; i
< nolb
; i
++) {
408 bvec
[i
].bv_page
= sg_page(&cmd
->t_data_sg
[0]);
409 bvec
[i
].bv_len
= cmd
->t_data_sg
[0].length
;
410 bvec
[i
].bv_offset
= cmd
->t_data_sg
[0].offset
;
412 len
+= se_dev
->dev_attrib
.block_size
;
415 iov_iter_bvec(&iter
, ITER_BVEC
, bvec
, nolb
, len
);
416 ret
= vfs_iter_write(fd_dev
->fd_file
, &iter
, &pos
, 0);
419 if (ret
< 0 || ret
!= len
) {
420 pr_err("vfs_iter_write() returned %zd for write same\n", ret
);
421 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
424 target_complete_cmd(cmd
, SAM_STAT_GOOD
);
429 fd_do_prot_fill(struct se_device
*se_dev
, sector_t lba
, sector_t nolb
,
430 void *buf
, size_t bufsize
)
432 struct fd_dev
*fd_dev
= FD_DEV(se_dev
);
433 struct file
*prot_fd
= fd_dev
->fd_prot_file
;
434 sector_t prot_length
, prot
;
435 loff_t pos
= lba
* se_dev
->prot_length
;
438 pr_err("Unable to locate fd_dev->fd_prot_file\n");
442 prot_length
= nolb
* se_dev
->prot_length
;
444 for (prot
= 0; prot
< prot_length
;) {
445 sector_t len
= min_t(sector_t
, bufsize
, prot_length
- prot
);
446 ssize_t ret
= kernel_write(prot_fd
, buf
, len
, pos
+ prot
);
449 pr_err("vfs_write to prot file failed: %zd\n", ret
);
450 return ret
< 0 ? ret
: -ENODEV
;
459 fd_do_prot_unmap(struct se_cmd
*cmd
, sector_t lba
, sector_t nolb
)
464 buf
= (void *)__get_free_page(GFP_KERNEL
);
466 pr_err("Unable to allocate FILEIO prot buf\n");
469 memset(buf
, 0xff, PAGE_SIZE
);
471 rc
= fd_do_prot_fill(cmd
->se_dev
, lba
, nolb
, buf
, PAGE_SIZE
);
473 free_page((unsigned long)buf
);
478 static sense_reason_t
479 fd_execute_unmap(struct se_cmd
*cmd
, sector_t lba
, sector_t nolb
)
481 struct file
*file
= FD_DEV(cmd
->se_dev
)->fd_file
;
482 struct inode
*inode
= file
->f_mapping
->host
;
485 if (cmd
->se_dev
->dev_attrib
.pi_prot_type
) {
486 ret
= fd_do_prot_unmap(cmd
, lba
, nolb
);
488 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
491 if (S_ISBLK(inode
->i_mode
)) {
492 /* The backend is block device, use discard */
493 struct block_device
*bdev
= inode
->i_bdev
;
494 struct se_device
*dev
= cmd
->se_dev
;
496 ret
= blkdev_issue_discard(bdev
,
497 target_to_linux_sector(dev
, lba
),
498 target_to_linux_sector(dev
, nolb
),
501 pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n",
503 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
506 /* The backend is normal file, use fallocate */
507 struct se_device
*se_dev
= cmd
->se_dev
;
508 loff_t pos
= lba
* se_dev
->dev_attrib
.block_size
;
509 unsigned int len
= nolb
* se_dev
->dev_attrib
.block_size
;
510 int mode
= FALLOC_FL_PUNCH_HOLE
| FALLOC_FL_KEEP_SIZE
;
512 if (!file
->f_op
->fallocate
)
513 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
515 ret
= file
->f_op
->fallocate(file
, mode
, pos
, len
);
517 pr_warn("FILEIO: fallocate() failed: %d\n", ret
);
518 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
525 static sense_reason_t
526 fd_execute_rw(struct se_cmd
*cmd
, struct scatterlist
*sgl
, u32 sgl_nents
,
527 enum dma_data_direction data_direction
)
529 struct se_device
*dev
= cmd
->se_dev
;
530 struct fd_dev
*fd_dev
= FD_DEV(dev
);
531 struct file
*file
= fd_dev
->fd_file
;
532 struct file
*pfile
= fd_dev
->fd_prot_file
;
536 * We are currently limited by the number of iovecs (2048) per
537 * single vfs_[writev,readv] call.
539 if (cmd
->data_length
> FD_MAX_BYTES
) {
540 pr_err("FILEIO: Not able to process I/O of %u bytes due to"
541 "FD_MAX_BYTES: %u iovec count limitation\n",
542 cmd
->data_length
, FD_MAX_BYTES
);
543 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
546 * Call vectorized fileio functions to map struct scatterlist
547 * physical memory addresses to struct iovec virtual memory.
549 if (data_direction
== DMA_FROM_DEVICE
) {
550 if (cmd
->prot_type
&& dev
->dev_attrib
.pi_prot_type
) {
551 ret
= fd_do_rw(cmd
, pfile
, dev
->prot_length
,
552 cmd
->t_prot_sg
, cmd
->t_prot_nents
,
553 cmd
->prot_length
, 0);
555 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
558 ret
= fd_do_rw(cmd
, file
, dev
->dev_attrib
.block_size
,
559 sgl
, sgl_nents
, cmd
->data_length
, 0);
561 if (ret
> 0 && cmd
->prot_type
&& dev
->dev_attrib
.pi_prot_type
&&
562 dev
->dev_attrib
.pi_prot_verify
) {
563 u32 sectors
= cmd
->data_length
>>
564 ilog2(dev
->dev_attrib
.block_size
);
566 rc
= sbc_dif_verify(cmd
, cmd
->t_task_lba
, sectors
,
567 0, cmd
->t_prot_sg
, 0);
572 if (cmd
->prot_type
&& dev
->dev_attrib
.pi_prot_type
&&
573 dev
->dev_attrib
.pi_prot_verify
) {
574 u32 sectors
= cmd
->data_length
>>
575 ilog2(dev
->dev_attrib
.block_size
);
577 rc
= sbc_dif_verify(cmd
, cmd
->t_task_lba
, sectors
,
578 0, cmd
->t_prot_sg
, 0);
583 ret
= fd_do_rw(cmd
, file
, dev
->dev_attrib
.block_size
,
584 sgl
, sgl_nents
, cmd
->data_length
, 1);
586 * Perform implicit vfs_fsync_range() for fd_do_writev() ops
587 * for SCSI WRITEs with Forced Unit Access (FUA) set.
588 * Allow this to happen independent of WCE=0 setting.
590 if (ret
> 0 && (cmd
->se_cmd_flags
& SCF_FUA
)) {
591 loff_t start
= cmd
->t_task_lba
*
592 dev
->dev_attrib
.block_size
;
595 if (cmd
->data_length
)
596 end
= start
+ cmd
->data_length
- 1;
600 vfs_fsync_range(fd_dev
->fd_file
, start
, end
, 1);
603 if (ret
> 0 && cmd
->prot_type
&& dev
->dev_attrib
.pi_prot_type
) {
604 ret
= fd_do_rw(cmd
, pfile
, dev
->prot_length
,
605 cmd
->t_prot_sg
, cmd
->t_prot_nents
,
606 cmd
->prot_length
, 1);
608 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
613 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
615 target_complete_cmd(cmd
, SAM_STAT_GOOD
);
620 Opt_fd_dev_name
, Opt_fd_dev_size
, Opt_fd_buffered_io
, Opt_err
623 static match_table_t tokens
= {
624 {Opt_fd_dev_name
, "fd_dev_name=%s"},
625 {Opt_fd_dev_size
, "fd_dev_size=%s"},
626 {Opt_fd_buffered_io
, "fd_buffered_io=%d"},
630 static ssize_t
fd_set_configfs_dev_params(struct se_device
*dev
,
631 const char *page
, ssize_t count
)
633 struct fd_dev
*fd_dev
= FD_DEV(dev
);
634 char *orig
, *ptr
, *arg_p
, *opts
;
635 substring_t args
[MAX_OPT_ARGS
];
636 int ret
= 0, arg
, token
;
638 opts
= kstrdup(page
, GFP_KERNEL
);
644 while ((ptr
= strsep(&opts
, ",\n")) != NULL
) {
648 token
= match_token(ptr
, tokens
, args
);
650 case Opt_fd_dev_name
:
651 if (match_strlcpy(fd_dev
->fd_dev_name
, &args
[0],
652 FD_MAX_DEV_NAME
) == 0) {
656 pr_debug("FILEIO: Referencing Path: %s\n",
657 fd_dev
->fd_dev_name
);
658 fd_dev
->fbd_flags
|= FBDF_HAS_PATH
;
660 case Opt_fd_dev_size
:
661 arg_p
= match_strdup(&args
[0]);
666 ret
= kstrtoull(arg_p
, 0, &fd_dev
->fd_dev_size
);
669 pr_err("kstrtoull() failed for"
673 pr_debug("FILEIO: Referencing Size: %llu"
674 " bytes\n", fd_dev
->fd_dev_size
);
675 fd_dev
->fbd_flags
|= FBDF_HAS_SIZE
;
677 case Opt_fd_buffered_io
:
678 ret
= match_int(args
, &arg
);
682 pr_err("bogus fd_buffered_io=%d value\n", arg
);
687 pr_debug("FILEIO: Using buffered I/O"
688 " operations for struct fd_dev\n");
690 fd_dev
->fbd_flags
|= FDBD_HAS_BUFFERED_IO_WCE
;
699 return (!ret
) ? count
: ret
;
702 static ssize_t
fd_show_configfs_dev_params(struct se_device
*dev
, char *b
)
704 struct fd_dev
*fd_dev
= FD_DEV(dev
);
707 bl
= sprintf(b
+ bl
, "TCM FILEIO ID: %u", fd_dev
->fd_dev_id
);
708 bl
+= sprintf(b
+ bl
, " File: %s Size: %llu Mode: %s\n",
709 fd_dev
->fd_dev_name
, fd_dev
->fd_dev_size
,
710 (fd_dev
->fbd_flags
& FDBD_HAS_BUFFERED_IO_WCE
) ?
711 "Buffered-WCE" : "O_DSYNC");
715 static sector_t
fd_get_blocks(struct se_device
*dev
)
717 struct fd_dev
*fd_dev
= FD_DEV(dev
);
718 struct file
*f
= fd_dev
->fd_file
;
719 struct inode
*i
= f
->f_mapping
->host
;
720 unsigned long long dev_size
;
722 * When using a file that references an underlying struct block_device,
723 * ensure dev_size is always based on the current inode size in order
724 * to handle underlying block_device resize operations.
726 if (S_ISBLK(i
->i_mode
))
727 dev_size
= i_size_read(i
);
729 dev_size
= fd_dev
->fd_dev_size
;
731 return div_u64(dev_size
- dev
->dev_attrib
.block_size
,
732 dev
->dev_attrib
.block_size
);
735 static int fd_init_prot(struct se_device
*dev
)
737 struct fd_dev
*fd_dev
= FD_DEV(dev
);
738 struct file
*prot_file
, *file
= fd_dev
->fd_file
;
740 int ret
, flags
= O_RDWR
| O_CREAT
| O_LARGEFILE
| O_DSYNC
;
741 char buf
[FD_MAX_DEV_PROT_NAME
];
744 pr_err("Unable to locate fd_dev->fd_file\n");
748 inode
= file
->f_mapping
->host
;
749 if (S_ISBLK(inode
->i_mode
)) {
750 pr_err("FILEIO Protection emulation only supported on"
755 if (fd_dev
->fbd_flags
& FDBD_HAS_BUFFERED_IO_WCE
)
758 snprintf(buf
, FD_MAX_DEV_PROT_NAME
, "%s.protection",
759 fd_dev
->fd_dev_name
);
761 prot_file
= filp_open(buf
, flags
, 0600);
762 if (IS_ERR(prot_file
)) {
763 pr_err("filp_open(%s) failed\n", buf
);
764 ret
= PTR_ERR(prot_file
);
767 fd_dev
->fd_prot_file
= prot_file
;
772 static int fd_format_prot(struct se_device
*dev
)
775 int unit_size
= FDBD_FORMAT_UNIT_SIZE
* dev
->dev_attrib
.block_size
;
778 if (!dev
->dev_attrib
.pi_prot_type
) {
779 pr_err("Unable to format_prot while pi_prot_type == 0\n");
783 buf
= vzalloc(unit_size
);
785 pr_err("Unable to allocate FILEIO prot buf\n");
789 pr_debug("Using FILEIO prot_length: %llu\n",
790 (unsigned long long)(dev
->transport
->get_blocks(dev
) + 1) *
793 memset(buf
, 0xff, unit_size
);
794 ret
= fd_do_prot_fill(dev
, 0, dev
->transport
->get_blocks(dev
) + 1,
800 static void fd_free_prot(struct se_device
*dev
)
802 struct fd_dev
*fd_dev
= FD_DEV(dev
);
804 if (!fd_dev
->fd_prot_file
)
807 filp_close(fd_dev
->fd_prot_file
, NULL
);
808 fd_dev
->fd_prot_file
= NULL
;
811 static struct sbc_ops fd_sbc_ops
= {
812 .execute_rw
= fd_execute_rw
,
813 .execute_sync_cache
= fd_execute_sync_cache
,
814 .execute_write_same
= fd_execute_write_same
,
815 .execute_unmap
= fd_execute_unmap
,
818 static sense_reason_t
819 fd_parse_cdb(struct se_cmd
*cmd
)
821 return sbc_parse_cdb(cmd
, &fd_sbc_ops
);
824 static const struct target_backend_ops fileio_ops
= {
826 .inquiry_prod
= "FILEIO",
827 .inquiry_rev
= FD_VERSION
,
828 .owner
= THIS_MODULE
,
829 .attach_hba
= fd_attach_hba
,
830 .detach_hba
= fd_detach_hba
,
831 .alloc_device
= fd_alloc_device
,
832 .configure_device
= fd_configure_device
,
833 .destroy_device
= fd_destroy_device
,
834 .free_device
= fd_free_device
,
835 .parse_cdb
= fd_parse_cdb
,
836 .set_configfs_dev_params
= fd_set_configfs_dev_params
,
837 .show_configfs_dev_params
= fd_show_configfs_dev_params
,
838 .get_device_type
= sbc_get_device_type
,
839 .get_blocks
= fd_get_blocks
,
840 .init_prot
= fd_init_prot
,
841 .format_prot
= fd_format_prot
,
842 .free_prot
= fd_free_prot
,
843 .tb_dev_attrib_attrs
= sbc_attrib_attrs
,
846 static int __init
fileio_module_init(void)
848 return transport_backend_register(&fileio_ops
);
851 static void __exit
fileio_module_exit(void)
853 target_backend_unregister(&fileio_ops
);
856 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin");
857 MODULE_AUTHOR("nab@Linux-iSCSI.org");
858 MODULE_LICENSE("GPL");
860 module_init(fileio_module_init
);
861 module_exit(fileio_module_exit
);