]>
Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
c66ac9db NB |
2 | /******************************************************************************* |
3 | * Filename: target_core_file.c | |
4 | * | |
5 | * This file contains the Storage Engine <-> FILEIO transport specific functions | |
6 | * | |
4c76251e | 7 | * (c) Copyright 2005-2013 Datera, Inc. |
c66ac9db NB |
8 | * |
9 | * Nicholas A. Bellinger <nab@kernel.org> | |
10 | * | |
c66ac9db NB |
11 | ******************************************************************************/ |
12 | ||
c66ac9db NB |
13 | #include <linux/string.h> |
14 | #include <linux/parser.h> | |
15 | #include <linux/timer.h> | |
16 | #include <linux/blkdev.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/spinlock.h> | |
827509e3 | 19 | #include <linux/module.h> |
5538d294 | 20 | #include <linux/vmalloc.h> |
70d3ae5c | 21 | #include <linux/falloc.h> |
8dcf07be | 22 | #include <linux/uio.h> |
24b83deb | 23 | #include <linux/scatterlist.h> |
ba929992 | 24 | #include <scsi/scsi_proto.h> |
50642762 | 25 | #include <asm/unaligned.h> |
c66ac9db NB |
26 | |
27 | #include <target/target_core_base.h> | |
c4795fb2 | 28 | #include <target/target_core_backend.h> |
c66ac9db NB |
29 | |
30 | #include "target_core_file.h" | |
31 | ||
0fd97ccf CH |
32 | static inline struct fd_dev *FD_DEV(struct se_device *dev) |
33 | { | |
34 | return container_of(dev, struct fd_dev, dev); | |
35 | } | |
c66ac9db | 36 | |
c66ac9db NB |
37 | static int fd_attach_hba(struct se_hba *hba, u32 host_id) |
38 | { | |
39 | struct fd_host *fd_host; | |
40 | ||
41 | fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); | |
6708bb27 AG |
42 | if (!fd_host) { |
43 | pr_err("Unable to allocate memory for struct fd_host\n"); | |
e3d6f909 | 44 | return -ENOMEM; |
c66ac9db NB |
45 | } |
46 | ||
47 | fd_host->fd_host_id = host_id; | |
48 | ||
e3d6f909 | 49 | hba->hba_ptr = fd_host; |
c66ac9db | 50 | |
6708bb27 | 51 | pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" |
c66ac9db | 52 | " Target Core Stack %s\n", hba->hba_id, FD_VERSION, |
ce8dd25d | 53 | TARGET_CORE_VERSION); |
95cadace NB |
54 | pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n", |
55 | hba->hba_id, fd_host->fd_host_id); | |
c66ac9db NB |
56 | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static void fd_detach_hba(struct se_hba *hba) | |
61 | { | |
62 | struct fd_host *fd_host = hba->hba_ptr; | |
63 | ||
6708bb27 | 64 | pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" |
c66ac9db NB |
65 | " Target Core\n", hba->hba_id, fd_host->fd_host_id); |
66 | ||
67 | kfree(fd_host); | |
68 | hba->hba_ptr = NULL; | |
69 | } | |
70 | ||
0fd97ccf | 71 | static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
72 | { |
73 | struct fd_dev *fd_dev; | |
8359cf43 | 74 | struct fd_host *fd_host = hba->hba_ptr; |
c66ac9db NB |
75 | |
76 | fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); | |
6708bb27 AG |
77 | if (!fd_dev) { |
78 | pr_err("Unable to allocate memory for struct fd_dev\n"); | |
c66ac9db NB |
79 | return NULL; |
80 | } | |
81 | ||
82 | fd_dev->fd_host = fd_host; | |
83 | ||
6708bb27 | 84 | pr_debug("FILEIO: Allocated fd_dev for %p\n", name); |
c66ac9db | 85 | |
0fd97ccf | 86 | return &fd_dev->dev; |
c66ac9db NB |
87 | } |
88 | ||
33efaaf6 MC |
89 | static bool fd_configure_unmap(struct se_device *dev) |
90 | { | |
91 | struct file *file = FD_DEV(dev)->fd_file; | |
92 | struct inode *inode = file->f_mapping->host; | |
93 | ||
94 | if (S_ISBLK(inode->i_mode)) | |
95 | return target_configure_unmap_from_queue(&dev->dev_attrib, | |
96 | I_BDEV(inode)); | |
97 | ||
98 | /* Limit UNMAP emulation to 8k Number of LBAs (NoLB) */ | |
99 | dev->dev_attrib.max_unmap_lba_count = 0x2000; | |
100 | /* Currently hardcoded to 1 in Linux/SCSI code. */ | |
101 | dev->dev_attrib.max_unmap_block_desc_count = 1; | |
102 | dev->dev_attrib.unmap_granularity = 1; | |
103 | dev->dev_attrib.unmap_granularity_alignment = 0; | |
104 | return true; | |
105 | } | |
106 | ||
0fd97ccf | 107 | static int fd_configure_device(struct se_device *dev) |
c66ac9db | 108 | { |
0fd97ccf CH |
109 | struct fd_dev *fd_dev = FD_DEV(dev); |
110 | struct fd_host *fd_host = dev->se_hba->hba_ptr; | |
c66ac9db NB |
111 | struct file *file; |
112 | struct inode *inode = NULL; | |
0fd97ccf | 113 | int flags, ret = -EINVAL; |
c66ac9db | 114 | |
0fd97ccf CH |
115 | if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { |
116 | pr_err("Missing fd_dev_name=\n"); | |
117 | return -EINVAL; | |
118 | } | |
c66ac9db | 119 | |
c66ac9db | 120 | /* |
a4dff304 NB |
121 | * Use O_DSYNC by default instead of O_SYNC to forgo syncing |
122 | * of pure timestamp updates. | |
c66ac9db | 123 | */ |
a4dff304 | 124 | flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; |
0fd97ccf | 125 | |
b32f4c7e NB |
126 | /* |
127 | * Optionally allow fd_buffered_io=1 to be enabled for people | |
128 | * who want use the fs buffer cache as an WriteCache mechanism. | |
129 | * | |
130 | * This means that in event of a hard failure, there is a risk | |
131 | * of silent data-loss if the SCSI client has *not* performed a | |
132 | * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE | |
133 | * to write-out the entire device cache. | |
134 | */ | |
135 | if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { | |
136 | pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); | |
137 | flags &= ~O_DSYNC; | |
138 | } | |
c66ac9db | 139 | |
dbc6e022 | 140 | file = filp_open(fd_dev->fd_dev_name, flags, 0600); |
613640e4 | 141 | if (IS_ERR(file)) { |
dbc6e022 | 142 | pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); |
613640e4 NB |
143 | ret = PTR_ERR(file); |
144 | goto fail; | |
145 | } | |
c66ac9db NB |
146 | fd_dev->fd_file = file; |
147 | /* | |
148 | * If using a block backend with this struct file, we extract | |
149 | * fd_dev->fd_[block,dev]_size from struct block_device. | |
150 | * | |
151 | * Otherwise, we use the passed fd_size= from configfs | |
152 | */ | |
153 | inode = file->f_mapping->host; | |
154 | if (S_ISBLK(inode->i_mode)) { | |
817e8b51 | 155 | struct block_device *bdev = I_BDEV(inode); |
cd9323fd | 156 | unsigned long long dev_size; |
0fd97ccf | 157 | |
817e8b51 | 158 | fd_dev->fd_block_size = bdev_logical_block_size(bdev); |
c66ac9db NB |
159 | /* |
160 | * Determine the number of bytes from i_size_read() minus | |
161 | * one (1) logical sector from underlying struct block_device | |
162 | */ | |
cd9323fd | 163 | dev_size = (i_size_read(file->f_mapping->host) - |
c66ac9db NB |
164 | fd_dev->fd_block_size); |
165 | ||
6708bb27 | 166 | pr_debug("FILEIO: Using size: %llu bytes from struct" |
c66ac9db | 167 | " block_device blocks: %llu logical_block_size: %d\n", |
cd9323fd | 168 | dev_size, div_u64(dev_size, fd_dev->fd_block_size), |
c66ac9db | 169 | fd_dev->fd_block_size); |
70d3ae5c AH |
170 | /* |
171 | * Enable write same emulation for IBLOCK and use 0xFFFF as | |
172 | * the smaller WRITE_SAME(10) only has a two-byte block count. | |
173 | */ | |
174 | dev->dev_attrib.max_write_same_len = 0xFFFF; | |
0463a3fe | 175 | |
10f0d2a5 | 176 | if (bdev_nonrot(bdev)) |
0463a3fe | 177 | dev->dev_attrib.is_nonrot = 1; |
c66ac9db NB |
178 | } else { |
179 | if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { | |
6708bb27 | 180 | pr_err("FILEIO: Missing fd_dev_size=" |
c66ac9db NB |
181 | " parameter, and no backing struct" |
182 | " block_device\n"); | |
183 | goto fail; | |
184 | } | |
185 | ||
21363ca8 | 186 | fd_dev->fd_block_size = FD_BLOCKSIZE; |
70d3ae5c AH |
187 | |
188 | /* | |
189 | * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) | |
190 | * based upon struct iovec limit for vfs_writev() | |
191 | */ | |
192 | dev->dev_attrib.max_write_same_len = 0x1000; | |
c66ac9db NB |
193 | } |
194 | ||
21363ca8 | 195 | dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; |
95cadace | 196 | dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size; |
0fd97ccf | 197 | dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; |
c66ac9db | 198 | |
b32f4c7e NB |
199 | if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { |
200 | pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" | |
201 | " with FDBD_HAS_BUFFERED_IO_WCE\n"); | |
0fd97ccf | 202 | dev->dev_attrib.emulate_write_cache = 1; |
b32f4c7e NB |
203 | } |
204 | ||
c66ac9db NB |
205 | fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; |
206 | fd_dev->fd_queue_depth = dev->queue_depth; | |
207 | ||
6708bb27 | 208 | pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," |
c66ac9db NB |
209 | " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, |
210 | fd_dev->fd_dev_name, fd_dev->fd_dev_size); | |
211 | ||
0fd97ccf | 212 | return 0; |
c66ac9db NB |
213 | fail: |
214 | if (fd_dev->fd_file) { | |
215 | filp_close(fd_dev->fd_file, NULL); | |
216 | fd_dev->fd_file = NULL; | |
217 | } | |
0fd97ccf | 218 | return ret; |
c66ac9db NB |
219 | } |
220 | ||
4cc987ea | 221 | static void fd_dev_call_rcu(struct rcu_head *p) |
c66ac9db | 222 | { |
4cc987ea | 223 | struct se_device *dev = container_of(p, struct se_device, rcu_head); |
0fd97ccf | 224 | struct fd_dev *fd_dev = FD_DEV(dev); |
c66ac9db | 225 | |
c66ac9db NB |
226 | kfree(fd_dev); |
227 | } | |
228 | ||
0fd97ccf | 229 | static void fd_free_device(struct se_device *dev) |
92634706 MC |
230 | { |
231 | call_rcu(&dev->rcu_head, fd_dev_call_rcu); | |
232 | } | |
233 | ||
234 | static void fd_destroy_device(struct se_device *dev) | |
42201b55 | 235 | { |
0fd97ccf | 236 | struct fd_dev *fd_dev = FD_DEV(dev); |
42201b55 | 237 | |
c66ac9db NB |
238 | if (fd_dev->fd_file) { |
239 | filp_close(fd_dev->fd_file, NULL); | |
240 | fd_dev->fd_file = NULL; | |
42201b55 | 241 | } |
42201b55 NB |
242 | } |
243 | ||
769031c9 AV |
244 | struct target_core_file_cmd { |
245 | unsigned long len; | |
246 | struct se_cmd *cmd; | |
247 | struct kiocb iocb; | |
ecd7fba0 | 248 | struct bio_vec bvecs[]; |
769031c9 AV |
249 | }; |
250 | ||
6b19b766 | 251 | static void cmd_rw_aio_complete(struct kiocb *iocb, long ret) |
769031c9 AV |
252 | { |
253 | struct target_core_file_cmd *cmd; | |
254 | ||
255 | cmd = container_of(iocb, struct target_core_file_cmd, iocb); | |
256 | ||
257 | if (ret != cmd->len) | |
258 | target_complete_cmd(cmd->cmd, SAM_STAT_CHECK_CONDITION); | |
259 | else | |
260 | target_complete_cmd(cmd->cmd, SAM_STAT_GOOD); | |
261 | ||
262 | kfree(cmd); | |
263 | } | |
264 | ||
265 | static sense_reason_t | |
266 | fd_execute_rw_aio(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, | |
267 | enum dma_data_direction data_direction) | |
268 | { | |
269 | int is_write = !(data_direction == DMA_FROM_DEVICE); | |
270 | struct se_device *dev = cmd->se_dev; | |
271 | struct fd_dev *fd_dev = FD_DEV(dev); | |
272 | struct file *file = fd_dev->fd_file; | |
273 | struct target_core_file_cmd *aio_cmd; | |
6b1dba3d | 274 | struct iov_iter iter; |
769031c9 | 275 | struct scatterlist *sg; |
769031c9 AV |
276 | ssize_t len = 0; |
277 | int ret = 0, i; | |
278 | ||
ecd7fba0 | 279 | aio_cmd = kmalloc(struct_size(aio_cmd, bvecs, sgl_nents), GFP_KERNEL); |
769031c9 AV |
280 | if (!aio_cmd) |
281 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
282 | ||
769031c9 | 283 | for_each_sg(sgl, sg, sgl_nents, i) { |
3c7ebe95 CH |
284 | bvec_set_page(&aio_cmd->bvecs[i], sg_page(sg), sg->length, |
285 | sg->offset); | |
769031c9 AV |
286 | len += sg->length; |
287 | } | |
288 | ||
ecd7fba0 | 289 | iov_iter_bvec(&iter, is_write, aio_cmd->bvecs, sgl_nents, len); |
769031c9 AV |
290 | |
291 | aio_cmd->cmd = cmd; | |
292 | aio_cmd->len = len; | |
293 | aio_cmd->iocb.ki_pos = cmd->t_task_lba * dev->dev_attrib.block_size; | |
294 | aio_cmd->iocb.ki_filp = file; | |
295 | aio_cmd->iocb.ki_complete = cmd_rw_aio_complete; | |
296 | aio_cmd->iocb.ki_flags = IOCB_DIRECT; | |
297 | ||
298 | if (is_write && (cmd->se_cmd_flags & SCF_FUA)) | |
299 | aio_cmd->iocb.ki_flags |= IOCB_DSYNC; | |
300 | ||
301 | if (is_write) | |
302 | ret = call_write_iter(file, &aio_cmd->iocb, &iter); | |
303 | else | |
304 | ret = call_read_iter(file, &aio_cmd->iocb, &iter); | |
305 | ||
769031c9 | 306 | if (ret != -EIOCBQUEUED) |
6b19b766 | 307 | cmd_rw_aio_complete(&aio_cmd->iocb, ret); |
769031c9 AV |
308 | |
309 | return 0; | |
310 | } | |
311 | ||
8287fa5f SG |
312 | static int fd_do_rw(struct se_cmd *cmd, struct file *fd, |
313 | u32 block_size, struct scatterlist *sgl, | |
314 | u32 sgl_nents, u32 data_length, int is_write) | |
c66ac9db | 315 | { |
5787cacd | 316 | struct scatterlist *sg; |
6b9a44d0 CH |
317 | struct iov_iter iter; |
318 | struct bio_vec *bvec; | |
319 | ssize_t len = 0; | |
8287fa5f | 320 | loff_t pos = (cmd->t_task_lba * block_size); |
c66ac9db NB |
321 | int ret = 0, i; |
322 | ||
6b9a44d0 CH |
323 | bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL); |
324 | if (!bvec) { | |
6708bb27 | 325 | pr_err("Unable to allocate fd_do_readv iov[]\n"); |
e3d6f909 | 326 | return -ENOMEM; |
c66ac9db NB |
327 | } |
328 | ||
5787cacd | 329 | for_each_sg(sgl, sg, sgl_nents, i) { |
3c7ebe95 | 330 | bvec_set_page(&bvec[i], sg_page(sg), sg->length, sg->offset); |
6b9a44d0 CH |
331 | len += sg->length; |
332 | } | |
778229af | 333 | |
b676668d | 334 | iov_iter_bvec(&iter, is_write, bvec, sgl_nents, len); |
269aed70 | 335 | if (is_write) |
abbb6589 | 336 | ret = vfs_iter_write(fd, &iter, &pos, 0); |
269aed70 | 337 | else |
18e9710e | 338 | ret = vfs_iter_read(fd, &iter, &pos, 0); |
269aed70 | 339 | |
778229af | 340 | if (is_write) { |
8287fa5f | 341 | if (ret < 0 || ret != data_length) { |
778229af | 342 | pr_err("%s() write returned %d\n", __func__, ret); |
f11b55d1 DM |
343 | if (ret >= 0) |
344 | ret = -EINVAL; | |
c66ac9db NB |
345 | } |
346 | } else { | |
778229af SAS |
347 | /* |
348 | * Return zeros and GOOD status even if the READ did not return | |
349 | * the expected virt_size for struct file w/o a backing struct | |
350 | * block_device. | |
351 | */ | |
496ad9aa | 352 | if (S_ISBLK(file_inode(fd)->i_mode)) { |
8287fa5f | 353 | if (ret < 0 || ret != data_length) { |
778229af SAS |
354 | pr_err("%s() returned %d, expecting %u for " |
355 | "S_ISBLK\n", __func__, ret, | |
8287fa5f | 356 | data_length); |
f11b55d1 DM |
357 | if (ret >= 0) |
358 | ret = -EINVAL; | |
778229af SAS |
359 | } |
360 | } else { | |
361 | if (ret < 0) { | |
362 | pr_err("%s() returned %d for non S_ISBLK\n", | |
363 | __func__, ret); | |
f11b55d1 DM |
364 | } else if (ret != data_length) { |
365 | /* | |
366 | * Short read case: | |
367 | * Probably some one truncate file under us. | |
368 | * We must explicitly zero sg-pages to prevent | |
369 | * expose uninizialized pages to userspace. | |
370 | */ | |
371 | if (ret < data_length) | |
372 | ret += iov_iter_zero(data_length - ret, &iter); | |
373 | else | |
374 | ret = -EINVAL; | |
778229af | 375 | } |
c66ac9db NB |
376 | } |
377 | } | |
f11b55d1 DM |
378 | kfree(bvec); |
379 | return ret; | |
c66ac9db NB |
380 | } |
381 | ||
de103c93 CH |
382 | static sense_reason_t |
383 | fd_execute_sync_cache(struct se_cmd *cmd) | |
c66ac9db | 384 | { |
c66ac9db | 385 | struct se_device *dev = cmd->se_dev; |
0fd97ccf | 386 | struct fd_dev *fd_dev = FD_DEV(dev); |
a1d8b49a | 387 | int immed = (cmd->t_task_cdb[1] & 0x2); |
c66ac9db NB |
388 | loff_t start, end; |
389 | int ret; | |
390 | ||
391 | /* | |
392 | * If the Immediate bit is set, queue up the GOOD response | |
393 | * for this SYNCHRONIZE_CACHE op | |
394 | */ | |
395 | if (immed) | |
5787cacd | 396 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db NB |
397 | |
398 | /* | |
399 | * Determine if we will be flushing the entire device. | |
400 | */ | |
a1d8b49a | 401 | if (cmd->t_task_lba == 0 && cmd->data_length == 0) { |
c66ac9db NB |
402 | start = 0; |
403 | end = LLONG_MAX; | |
404 | } else { | |
0fd97ccf | 405 | start = cmd->t_task_lba * dev->dev_attrib.block_size; |
c66ac9db | 406 | if (cmd->data_length) |
62d3ab49 | 407 | end = start + cmd->data_length - 1; |
c66ac9db NB |
408 | else |
409 | end = LLONG_MAX; | |
410 | } | |
411 | ||
412 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); | |
413 | if (ret != 0) | |
6708bb27 | 414 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
c66ac9db | 415 | |
5787cacd | 416 | if (immed) |
ad67f0d9 | 417 | return 0; |
5787cacd | 418 | |
de103c93 | 419 | if (ret) |
5787cacd | 420 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); |
de103c93 | 421 | else |
5787cacd | 422 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
ad67f0d9 CH |
423 | |
424 | return 0; | |
c66ac9db NB |
425 | } |
426 | ||
7b745c84 NB |
427 | static sense_reason_t |
428 | fd_execute_write_same(struct se_cmd *cmd) | |
429 | { | |
430 | struct se_device *se_dev = cmd->se_dev; | |
431 | struct fd_dev *fd_dev = FD_DEV(se_dev); | |
7b745c84 | 432 | loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; |
d4c5dcac CH |
433 | sector_t nolb = sbc_get_write_same_sectors(cmd); |
434 | struct iov_iter iter; | |
435 | struct bio_vec *bvec; | |
436 | unsigned int len = 0, i; | |
437 | ssize_t ret; | |
7b745c84 | 438 | |
afd73f1b NB |
439 | if (cmd->prot_op) { |
440 | pr_err("WRITE_SAME: Protection information with FILEIO" | |
441 | " backends not supported\n"); | |
442 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
443 | } | |
7b745c84 | 444 | |
ccd3f449 MC |
445 | if (!cmd->t_data_nents) |
446 | return TCM_INVALID_CDB_FIELD; | |
447 | ||
7b745c84 | 448 | if (cmd->t_data_nents > 1 || |
d4c5dcac | 449 | cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) { |
7b745c84 | 450 | pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" |
d4c5dcac CH |
451 | " block_size: %u\n", |
452 | cmd->t_data_nents, | |
453 | cmd->t_data_sg[0].length, | |
7b745c84 NB |
454 | cmd->se_dev->dev_attrib.block_size); |
455 | return TCM_INVALID_CDB_FIELD; | |
456 | } | |
457 | ||
d4c5dcac CH |
458 | bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL); |
459 | if (!bvec) | |
7b745c84 NB |
460 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
461 | ||
d4c5dcac | 462 | for (i = 0; i < nolb; i++) { |
3c7ebe95 CH |
463 | bvec_set_page(&bvec[i], sg_page(&cmd->t_data_sg[0]), |
464 | cmd->t_data_sg[0].length, | |
465 | cmd->t_data_sg[0].offset); | |
d4c5dcac CH |
466 | len += se_dev->dev_attrib.block_size; |
467 | } | |
7b745c84 | 468 | |
de4eda9d | 469 | iov_iter_bvec(&iter, ITER_SOURCE, bvec, nolb, len); |
abbb6589 | 470 | ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos, 0); |
7b745c84 | 471 | |
d4c5dcac CH |
472 | kfree(bvec); |
473 | if (ret < 0 || ret != len) { | |
474 | pr_err("vfs_iter_write() returned %zd for write same\n", ret); | |
7b745c84 NB |
475 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
476 | } | |
477 | ||
478 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
479 | return 0; | |
480 | } | |
481 | ||
64d240b7 AM |
482 | static int |
483 | fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb, | |
484 | void *buf, size_t bufsize) | |
485 | { | |
486 | struct fd_dev *fd_dev = FD_DEV(se_dev); | |
487 | struct file *prot_fd = fd_dev->fd_prot_file; | |
488 | sector_t prot_length, prot; | |
489 | loff_t pos = lba * se_dev->prot_length; | |
490 | ||
491 | if (!prot_fd) { | |
492 | pr_err("Unable to locate fd_dev->fd_prot_file\n"); | |
493 | return -ENODEV; | |
494 | } | |
495 | ||
496 | prot_length = nolb * se_dev->prot_length; | |
497 | ||
4524a0b1 | 498 | memset(buf, 0xff, bufsize); |
64d240b7 AM |
499 | for (prot = 0; prot < prot_length;) { |
500 | sector_t len = min_t(sector_t, bufsize, prot_length - prot); | |
e13ec939 | 501 | ssize_t ret = kernel_write(prot_fd, buf, len, &pos); |
64d240b7 AM |
502 | |
503 | if (ret != len) { | |
504 | pr_err("vfs_write to prot file failed: %zd\n", ret); | |
505 | return ret < 0 ? ret : -ENODEV; | |
506 | } | |
507 | prot += ret; | |
508 | } | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | static int | |
514 | fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) | |
515 | { | |
516 | void *buf; | |
517 | int rc; | |
518 | ||
519 | buf = (void *)__get_free_page(GFP_KERNEL); | |
520 | if (!buf) { | |
521 | pr_err("Unable to allocate FILEIO prot buf\n"); | |
522 | return -ENOMEM; | |
523 | } | |
64d240b7 AM |
524 | |
525 | rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE); | |
526 | ||
527 | free_page((unsigned long)buf); | |
528 | ||
529 | return rc; | |
530 | } | |
531 | ||
70d3ae5c | 532 | static sense_reason_t |
62e46942 | 533 | fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) |
70d3ae5c | 534 | { |
62e46942 | 535 | struct file *file = FD_DEV(cmd->se_dev)->fd_file; |
70d3ae5c | 536 | struct inode *inode = file->f_mapping->host; |
70d3ae5c AH |
537 | int ret; |
538 | ||
594e25e7 JY |
539 | if (!nolb) { |
540 | return 0; | |
541 | } | |
542 | ||
64d240b7 AM |
543 | if (cmd->se_dev->dev_attrib.pi_prot_type) { |
544 | ret = fd_do_prot_unmap(cmd, lba, nolb); | |
545 | if (ret) | |
546 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
547 | } | |
548 | ||
70d3ae5c AH |
549 | if (S_ISBLK(inode->i_mode)) { |
550 | /* The backend is block device, use discard */ | |
4e7b5671 | 551 | struct block_device *bdev = I_BDEV(inode); |
8a9ebe71 | 552 | struct se_device *dev = cmd->se_dev; |
70d3ae5c | 553 | |
8a9ebe71 MC |
554 | ret = blkdev_issue_discard(bdev, |
555 | target_to_linux_sector(dev, lba), | |
556 | target_to_linux_sector(dev, nolb), | |
44abff2c | 557 | GFP_KERNEL); |
70d3ae5c AH |
558 | if (ret < 0) { |
559 | pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", | |
560 | ret); | |
561 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
562 | } | |
563 | } else { | |
564 | /* The backend is normal file, use fallocate */ | |
43f55bbb AH |
565 | struct se_device *se_dev = cmd->se_dev; |
566 | loff_t pos = lba * se_dev->dev_attrib.block_size; | |
70d3ae5c AH |
567 | unsigned int len = nolb * se_dev->dev_attrib.block_size; |
568 | int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; | |
569 | ||
570 | if (!file->f_op->fallocate) | |
571 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
572 | ||
573 | ret = file->f_op->fallocate(file, mode, pos, len); | |
574 | if (ret < 0) { | |
575 | pr_warn("FILEIO: fallocate() failed: %d\n", ret); | |
576 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
577 | } | |
578 | } | |
579 | ||
43f55bbb AH |
580 | return 0; |
581 | } | |
582 | ||
de103c93 | 583 | static sense_reason_t |
769031c9 | 584 | fd_execute_rw_buffered(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
a82a9538 | 585 | enum dma_data_direction data_direction) |
c66ac9db | 586 | { |
c66ac9db | 587 | struct se_device *dev = cmd->se_dev; |
8287fa5f SG |
588 | struct fd_dev *fd_dev = FD_DEV(dev); |
589 | struct file *file = fd_dev->fd_file; | |
590 | struct file *pfile = fd_dev->fd_prot_file; | |
42201b55 | 591 | sense_reason_t rc; |
c66ac9db | 592 | int ret = 0; |
c66ac9db NB |
593 | /* |
594 | * Call vectorized fileio functions to map struct scatterlist | |
595 | * physical memory addresses to struct iovec virtual memory. | |
596 | */ | |
5787cacd | 597 | if (data_direction == DMA_FROM_DEVICE) { |
ee920469 | 598 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
8287fa5f SG |
599 | ret = fd_do_rw(cmd, pfile, dev->prot_length, |
600 | cmd->t_prot_sg, cmd->t_prot_nents, | |
601 | cmd->prot_length, 0); | |
42201b55 NB |
602 | if (ret < 0) |
603 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
604 | } | |
605 | ||
8287fa5f SG |
606 | ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, |
607 | sgl, sgl_nents, cmd->data_length, 0); | |
42201b55 | 608 | |
056e8924 DM |
609 | if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type && |
610 | dev->dev_attrib.pi_prot_verify) { | |
8287fa5f SG |
611 | u32 sectors = cmd->data_length >> |
612 | ilog2(dev->dev_attrib.block_size); | |
42201b55 | 613 | |
f75b6fae | 614 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, |
8287fa5f SG |
615 | 0, cmd->t_prot_sg, 0); |
616 | if (rc) | |
42201b55 | 617 | return rc; |
42201b55 | 618 | } |
c66ac9db | 619 | } else { |
056e8924 DM |
620 | if (cmd->prot_type && dev->dev_attrib.pi_prot_type && |
621 | dev->dev_attrib.pi_prot_verify) { | |
8287fa5f SG |
622 | u32 sectors = cmd->data_length >> |
623 | ilog2(dev->dev_attrib.block_size); | |
42201b55 | 624 | |
f75b6fae SG |
625 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, |
626 | 0, cmd->t_prot_sg, 0); | |
8287fa5f | 627 | if (rc) |
42201b55 | 628 | return rc; |
42201b55 NB |
629 | } |
630 | ||
8287fa5f SG |
631 | ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, |
632 | sgl, sgl_nents, cmd->data_length, 1); | |
a4dff304 | 633 | /* |
125d0119 | 634 | * Perform implicit vfs_fsync_range() for fd_do_writev() ops |
a4dff304 NB |
635 | * for SCSI WRITEs with Forced Unit Access (FUA) set. |
636 | * Allow this to happen independent of WCE=0 setting. | |
637 | */ | |
814e5b45 | 638 | if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) { |
a4dff304 | 639 | loff_t start = cmd->t_task_lba * |
0fd97ccf | 640 | dev->dev_attrib.block_size; |
62d3ab49 ZB |
641 | loff_t end; |
642 | ||
643 | if (cmd->data_length) | |
644 | end = start + cmd->data_length - 1; | |
645 | else | |
646 | end = LLONG_MAX; | |
c66ac9db | 647 | |
a4dff304 NB |
648 | vfs_fsync_range(fd_dev->fd_file, start, end, 1); |
649 | } | |
42201b55 | 650 | |
ee920469 | 651 | if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) { |
8287fa5f SG |
652 | ret = fd_do_rw(cmd, pfile, dev->prot_length, |
653 | cmd->t_prot_sg, cmd->t_prot_nents, | |
654 | cmd->prot_length, 1); | |
42201b55 NB |
655 | if (ret < 0) |
656 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
657 | } | |
c66ac9db NB |
658 | } |
659 | ||
8287fa5f | 660 | if (ret < 0) |
de103c93 CH |
661 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
662 | ||
59ac9c07 | 663 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
03e98c9e | 664 | return 0; |
c66ac9db NB |
665 | } |
666 | ||
769031c9 AV |
667 | static sense_reason_t |
668 | fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, | |
669 | enum dma_data_direction data_direction) | |
670 | { | |
671 | struct se_device *dev = cmd->se_dev; | |
672 | struct fd_dev *fd_dev = FD_DEV(dev); | |
673 | ||
674 | /* | |
675 | * We are currently limited by the number of iovecs (2048) per | |
676 | * single vfs_[writev,readv] call. | |
677 | */ | |
678 | if (cmd->data_length > FD_MAX_BYTES) { | |
679 | pr_err("FILEIO: Not able to process I/O of %u bytes due to" | |
680 | "FD_MAX_BYTES: %u iovec count limitation\n", | |
681 | cmd->data_length, FD_MAX_BYTES); | |
682 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
683 | } | |
684 | ||
685 | if (fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO) | |
686 | return fd_execute_rw_aio(cmd, sgl, sgl_nents, data_direction); | |
687 | return fd_execute_rw_buffered(cmd, sgl, sgl_nents, data_direction); | |
688 | } | |
689 | ||
c66ac9db | 690 | enum { |
769031c9 AV |
691 | Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, |
692 | Opt_fd_async_io, Opt_err | |
c66ac9db NB |
693 | }; |
694 | ||
695 | static match_table_t tokens = { | |
696 | {Opt_fd_dev_name, "fd_dev_name=%s"}, | |
697 | {Opt_fd_dev_size, "fd_dev_size=%s"}, | |
b32f4c7e | 698 | {Opt_fd_buffered_io, "fd_buffered_io=%d"}, |
769031c9 | 699 | {Opt_fd_async_io, "fd_async_io=%d"}, |
c66ac9db NB |
700 | {Opt_err, NULL} |
701 | }; | |
702 | ||
0fd97ccf CH |
703 | static ssize_t fd_set_configfs_dev_params(struct se_device *dev, |
704 | const char *page, ssize_t count) | |
c66ac9db | 705 | { |
0fd97ccf | 706 | struct fd_dev *fd_dev = FD_DEV(dev); |
c66ac9db NB |
707 | char *orig, *ptr, *arg_p, *opts; |
708 | substring_t args[MAX_OPT_ARGS]; | |
b32f4c7e | 709 | int ret = 0, arg, token; |
c66ac9db NB |
710 | |
711 | opts = kstrdup(page, GFP_KERNEL); | |
712 | if (!opts) | |
713 | return -ENOMEM; | |
714 | ||
715 | orig = opts; | |
716 | ||
90c161b6 | 717 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
718 | if (!*ptr) |
719 | continue; | |
720 | ||
721 | token = match_token(ptr, tokens, args); | |
722 | switch (token) { | |
723 | case Opt_fd_dev_name: | |
dbc6e022 AV |
724 | if (match_strlcpy(fd_dev->fd_dev_name, &args[0], |
725 | FD_MAX_DEV_NAME) == 0) { | |
726 | ret = -EINVAL; | |
6d180253 JJ |
727 | break; |
728 | } | |
6708bb27 | 729 | pr_debug("FILEIO: Referencing Path: %s\n", |
c66ac9db NB |
730 | fd_dev->fd_dev_name); |
731 | fd_dev->fbd_flags |= FBDF_HAS_PATH; | |
732 | break; | |
733 | case Opt_fd_dev_size: | |
734 | arg_p = match_strdup(&args[0]); | |
6d180253 JJ |
735 | if (!arg_p) { |
736 | ret = -ENOMEM; | |
737 | break; | |
738 | } | |
57103d7f | 739 | ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); |
6d180253 | 740 | kfree(arg_p); |
c66ac9db | 741 | if (ret < 0) { |
57103d7f | 742 | pr_err("kstrtoull() failed for" |
c66ac9db NB |
743 | " fd_dev_size=\n"); |
744 | goto out; | |
745 | } | |
6708bb27 | 746 | pr_debug("FILEIO: Referencing Size: %llu" |
c66ac9db NB |
747 | " bytes\n", fd_dev->fd_dev_size); |
748 | fd_dev->fbd_flags |= FBDF_HAS_SIZE; | |
749 | break; | |
b32f4c7e | 750 | case Opt_fd_buffered_io: |
ce31c1b0 JE |
751 | ret = match_int(args, &arg); |
752 | if (ret) | |
753 | goto out; | |
b32f4c7e NB |
754 | if (arg != 1) { |
755 | pr_err("bogus fd_buffered_io=%d value\n", arg); | |
756 | ret = -EINVAL; | |
757 | goto out; | |
758 | } | |
759 | ||
760 | pr_debug("FILEIO: Using buffered I/O" | |
761 | " operations for struct fd_dev\n"); | |
762 | ||
763 | fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; | |
764 | break; | |
769031c9 AV |
765 | case Opt_fd_async_io: |
766 | ret = match_int(args, &arg); | |
767 | if (ret) | |
768 | goto out; | |
769 | if (arg != 1) { | |
770 | pr_err("bogus fd_async_io=%d value\n", arg); | |
771 | ret = -EINVAL; | |
772 | goto out; | |
773 | } | |
774 | ||
775 | pr_debug("FILEIO: Using async I/O" | |
776 | " operations for struct fd_dev\n"); | |
777 | ||
778 | fd_dev->fbd_flags |= FDBD_HAS_ASYNC_IO; | |
779 | break; | |
c66ac9db NB |
780 | default: |
781 | break; | |
782 | } | |
783 | } | |
784 | ||
785 | out: | |
786 | kfree(orig); | |
787 | return (!ret) ? count : ret; | |
788 | } | |
789 | ||
0fd97ccf | 790 | static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 791 | { |
0fd97ccf | 792 | struct fd_dev *fd_dev = FD_DEV(dev); |
c66ac9db NB |
793 | ssize_t bl = 0; |
794 | ||
795 | bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); | |
769031c9 | 796 | bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s Async: %d\n", |
b32f4c7e NB |
797 | fd_dev->fd_dev_name, fd_dev->fd_dev_size, |
798 | (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? | |
769031c9 AV |
799 | "Buffered-WCE" : "O_DSYNC", |
800 | !!(fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO)); | |
c66ac9db NB |
801 | return bl; |
802 | } | |
803 | ||
c66ac9db NB |
804 | static sector_t fd_get_blocks(struct se_device *dev) |
805 | { | |
0fd97ccf | 806 | struct fd_dev *fd_dev = FD_DEV(dev); |
cd9323fd NB |
807 | struct file *f = fd_dev->fd_file; |
808 | struct inode *i = f->f_mapping->host; | |
809 | unsigned long long dev_size; | |
810 | /* | |
811 | * When using a file that references an underlying struct block_device, | |
812 | * ensure dev_size is always based on the current inode size in order | |
813 | * to handle underlying block_device resize operations. | |
814 | */ | |
815 | if (S_ISBLK(i->i_mode)) | |
21363ca8 | 816 | dev_size = i_size_read(i); |
cd9323fd NB |
817 | else |
818 | dev_size = fd_dev->fd_dev_size; | |
c66ac9db | 819 | |
21363ca8 NB |
820 | return div_u64(dev_size - dev->dev_attrib.block_size, |
821 | dev->dev_attrib.block_size); | |
c66ac9db NB |
822 | } |
823 | ||
0f5e2ec4 NB |
824 | static int fd_init_prot(struct se_device *dev) |
825 | { | |
826 | struct fd_dev *fd_dev = FD_DEV(dev); | |
827 | struct file *prot_file, *file = fd_dev->fd_file; | |
828 | struct inode *inode; | |
829 | int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; | |
830 | char buf[FD_MAX_DEV_PROT_NAME]; | |
831 | ||
832 | if (!file) { | |
833 | pr_err("Unable to locate fd_dev->fd_file\n"); | |
834 | return -ENODEV; | |
835 | } | |
836 | ||
837 | inode = file->f_mapping->host; | |
838 | if (S_ISBLK(inode->i_mode)) { | |
839 | pr_err("FILEIO Protection emulation only supported on" | |
840 | " !S_ISBLK\n"); | |
841 | return -ENOSYS; | |
842 | } | |
843 | ||
844 | if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) | |
845 | flags &= ~O_DSYNC; | |
846 | ||
847 | snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection", | |
848 | fd_dev->fd_dev_name); | |
849 | ||
850 | prot_file = filp_open(buf, flags, 0600); | |
851 | if (IS_ERR(prot_file)) { | |
852 | pr_err("filp_open(%s) failed\n", buf); | |
853 | ret = PTR_ERR(prot_file); | |
854 | return ret; | |
855 | } | |
856 | fd_dev->fd_prot_file = prot_file; | |
857 | ||
858 | return 0; | |
859 | } | |
860 | ||
0f5e2ec4 NB |
861 | static int fd_format_prot(struct se_device *dev) |
862 | { | |
0f5e2ec4 | 863 | unsigned char *buf; |
0f5e2ec4 | 864 | int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size; |
64d240b7 | 865 | int ret; |
0f5e2ec4 NB |
866 | |
867 | if (!dev->dev_attrib.pi_prot_type) { | |
868 | pr_err("Unable to format_prot while pi_prot_type == 0\n"); | |
869 | return -ENODEV; | |
870 | } | |
0f5e2ec4 | 871 | |
0f5e2ec4 NB |
872 | buf = vzalloc(unit_size); |
873 | if (!buf) { | |
874 | pr_err("Unable to allocate FILEIO prot buf\n"); | |
875 | return -ENOMEM; | |
876 | } | |
0f5e2ec4 NB |
877 | |
878 | pr_debug("Using FILEIO prot_length: %llu\n", | |
64d240b7 AM |
879 | (unsigned long long)(dev->transport->get_blocks(dev) + 1) * |
880 | dev->prot_length); | |
0f5e2ec4 | 881 | |
64d240b7 AM |
882 | ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1, |
883 | buf, unit_size); | |
0f5e2ec4 NB |
884 | vfree(buf); |
885 | return ret; | |
886 | } | |
887 | ||
888 | static void fd_free_prot(struct se_device *dev) | |
889 | { | |
890 | struct fd_dev *fd_dev = FD_DEV(dev); | |
891 | ||
892 | if (!fd_dev->fd_prot_file) | |
893 | return; | |
894 | ||
895 | filp_close(fd_dev->fd_prot_file, NULL); | |
896 | fd_dev->fd_prot_file = NULL; | |
897 | } | |
898 | ||
0217da08 | 899 | static struct exec_cmd_ops fd_exec_cmd_ops = { |
0c2ad7d1 | 900 | .execute_rw = fd_execute_rw, |
ad67f0d9 | 901 | .execute_sync_cache = fd_execute_sync_cache, |
7b745c84 | 902 | .execute_write_same = fd_execute_write_same, |
50642762 | 903 | .execute_unmap = fd_execute_unmap, |
0c2ad7d1 CH |
904 | }; |
905 | ||
de103c93 CH |
906 | static sense_reason_t |
907 | fd_parse_cdb(struct se_cmd *cmd) | |
0c2ad7d1 | 908 | { |
0217da08 | 909 | return sbc_parse_cdb(cmd, &fd_exec_cmd_ops); |
0c2ad7d1 CH |
910 | } |
911 | ||
0a06d430 | 912 | static const struct target_backend_ops fileio_ops = { |
c66ac9db | 913 | .name = "fileio", |
0fd97ccf CH |
914 | .inquiry_prod = "FILEIO", |
915 | .inquiry_rev = FD_VERSION, | |
c66ac9db | 916 | .owner = THIS_MODULE, |
c66ac9db NB |
917 | .attach_hba = fd_attach_hba, |
918 | .detach_hba = fd_detach_hba, | |
0fd97ccf CH |
919 | .alloc_device = fd_alloc_device, |
920 | .configure_device = fd_configure_device, | |
92634706 | 921 | .destroy_device = fd_destroy_device, |
c66ac9db | 922 | .free_device = fd_free_device, |
33efaaf6 | 923 | .configure_unmap = fd_configure_unmap, |
0c2ad7d1 | 924 | .parse_cdb = fd_parse_cdb, |
c66ac9db NB |
925 | .set_configfs_dev_params = fd_set_configfs_dev_params, |
926 | .show_configfs_dev_params = fd_show_configfs_dev_params, | |
6f23ac8a | 927 | .get_device_type = sbc_get_device_type, |
c66ac9db | 928 | .get_blocks = fd_get_blocks, |
0f5e2ec4 NB |
929 | .init_prot = fd_init_prot, |
930 | .format_prot = fd_format_prot, | |
931 | .free_prot = fd_free_prot, | |
5873c4d1 | 932 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
c66ac9db NB |
933 | }; |
934 | ||
935 | static int __init fileio_module_init(void) | |
936 | { | |
0a06d430 | 937 | return transport_backend_register(&fileio_ops); |
c66ac9db NB |
938 | } |
939 | ||
63b91d5a | 940 | static void __exit fileio_module_exit(void) |
c66ac9db | 941 | { |
0a06d430 | 942 | target_backend_unregister(&fileio_ops); |
c66ac9db NB |
943 | } |
944 | ||
945 | MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); | |
946 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
947 | MODULE_LICENSE("GPL"); | |
948 | ||
949 | module_init(fileio_module_init); | |
950 | module_exit(fileio_module_exit); |