Commit | Line | Data |
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c66ac9db NB |
1 | /******************************************************************************* |
2 | * Filename: target_core_file.c | |
3 | * | |
4 | * This file contains the Storage Engine <-> FILEIO transport specific functions | |
5 | * | |
6 | * Copyright (c) 2005 PyX Technologies, Inc. | |
7 | * Copyright (c) 2005-2006 SBE, Inc. All Rights Reserved. | |
8 | * Copyright (c) 2007-2010 Rising Tide Systems | |
9 | * Copyright (c) 2008-2010 Linux-iSCSI.org | |
10 | * | |
11 | * Nicholas A. Bellinger <nab@kernel.org> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
26 | * | |
27 | ******************************************************************************/ | |
28 | ||
c66ac9db NB |
29 | #include <linux/string.h> |
30 | #include <linux/parser.h> | |
31 | #include <linux/timer.h> | |
32 | #include <linux/blkdev.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/spinlock.h> | |
827509e3 | 35 | #include <linux/module.h> |
c66ac9db NB |
36 | #include <scsi/scsi.h> |
37 | #include <scsi/scsi_host.h> | |
38 | ||
39 | #include <target/target_core_base.h> | |
c4795fb2 | 40 | #include <target/target_core_backend.h> |
c66ac9db NB |
41 | |
42 | #include "target_core_file.h" | |
43 | ||
c66ac9db NB |
44 | static struct se_subsystem_api fileio_template; |
45 | ||
46 | /* fd_attach_hba(): (Part of se_subsystem_api_t template) | |
47 | * | |
48 | * | |
49 | */ | |
50 | static int fd_attach_hba(struct se_hba *hba, u32 host_id) | |
51 | { | |
52 | struct fd_host *fd_host; | |
53 | ||
54 | fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); | |
6708bb27 AG |
55 | if (!fd_host) { |
56 | pr_err("Unable to allocate memory for struct fd_host\n"); | |
e3d6f909 | 57 | return -ENOMEM; |
c66ac9db NB |
58 | } |
59 | ||
60 | fd_host->fd_host_id = host_id; | |
61 | ||
e3d6f909 | 62 | hba->hba_ptr = fd_host; |
c66ac9db | 63 | |
6708bb27 | 64 | pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" |
c66ac9db NB |
65 | " Target Core Stack %s\n", hba->hba_id, FD_VERSION, |
66 | TARGET_CORE_MOD_VERSION); | |
6708bb27 | 67 | pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" |
e3d6f909 AG |
68 | " MaxSectors: %u\n", |
69 | hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); | |
c66ac9db NB |
70 | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static void fd_detach_hba(struct se_hba *hba) | |
75 | { | |
76 | struct fd_host *fd_host = hba->hba_ptr; | |
77 | ||
6708bb27 | 78 | pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" |
c66ac9db NB |
79 | " Target Core\n", hba->hba_id, fd_host->fd_host_id); |
80 | ||
81 | kfree(fd_host); | |
82 | hba->hba_ptr = NULL; | |
83 | } | |
84 | ||
85 | static void *fd_allocate_virtdevice(struct se_hba *hba, const char *name) | |
86 | { | |
87 | struct fd_dev *fd_dev; | |
8359cf43 | 88 | struct fd_host *fd_host = hba->hba_ptr; |
c66ac9db NB |
89 | |
90 | fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); | |
6708bb27 AG |
91 | if (!fd_dev) { |
92 | pr_err("Unable to allocate memory for struct fd_dev\n"); | |
c66ac9db NB |
93 | return NULL; |
94 | } | |
95 | ||
96 | fd_dev->fd_host = fd_host; | |
97 | ||
6708bb27 | 98 | pr_debug("FILEIO: Allocated fd_dev for %p\n", name); |
c66ac9db NB |
99 | |
100 | return fd_dev; | |
101 | } | |
102 | ||
103 | /* fd_create_virtdevice(): (Part of se_subsystem_api_t template) | |
104 | * | |
105 | * | |
106 | */ | |
107 | static struct se_device *fd_create_virtdevice( | |
108 | struct se_hba *hba, | |
109 | struct se_subsystem_dev *se_dev, | |
110 | void *p) | |
111 | { | |
c66ac9db NB |
112 | struct se_device *dev; |
113 | struct se_dev_limits dev_limits; | |
114 | struct queue_limits *limits; | |
8359cf43 JE |
115 | struct fd_dev *fd_dev = p; |
116 | struct fd_host *fd_host = hba->hba_ptr; | |
c66ac9db NB |
117 | struct file *file; |
118 | struct inode *inode = NULL; | |
613640e4 | 119 | int dev_flags = 0, flags, ret = -EINVAL; |
c66ac9db NB |
120 | |
121 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
122 | ||
c66ac9db | 123 | /* |
a4dff304 NB |
124 | * Use O_DSYNC by default instead of O_SYNC to forgo syncing |
125 | * of pure timestamp updates. | |
c66ac9db | 126 | */ |
a4dff304 | 127 | flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; |
c66ac9db | 128 | |
dbc6e022 | 129 | file = filp_open(fd_dev->fd_dev_name, flags, 0600); |
613640e4 | 130 | if (IS_ERR(file)) { |
dbc6e022 | 131 | pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); |
613640e4 NB |
132 | ret = PTR_ERR(file); |
133 | goto fail; | |
134 | } | |
c66ac9db NB |
135 | fd_dev->fd_file = file; |
136 | /* | |
137 | * If using a block backend with this struct file, we extract | |
138 | * fd_dev->fd_[block,dev]_size from struct block_device. | |
139 | * | |
140 | * Otherwise, we use the passed fd_size= from configfs | |
141 | */ | |
142 | inode = file->f_mapping->host; | |
143 | if (S_ISBLK(inode->i_mode)) { | |
144 | struct request_queue *q; | |
cd9323fd | 145 | unsigned long long dev_size; |
c66ac9db NB |
146 | /* |
147 | * Setup the local scope queue_limits from struct request_queue->limits | |
148 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. | |
149 | */ | |
150 | q = bdev_get_queue(inode->i_bdev); | |
151 | limits = &dev_limits.limits; | |
152 | limits->logical_block_size = bdev_logical_block_size(inode->i_bdev); | |
153 | limits->max_hw_sectors = queue_max_hw_sectors(q); | |
154 | limits->max_sectors = queue_max_sectors(q); | |
155 | /* | |
156 | * Determine the number of bytes from i_size_read() minus | |
157 | * one (1) logical sector from underlying struct block_device | |
158 | */ | |
159 | fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); | |
cd9323fd | 160 | dev_size = (i_size_read(file->f_mapping->host) - |
c66ac9db NB |
161 | fd_dev->fd_block_size); |
162 | ||
6708bb27 | 163 | pr_debug("FILEIO: Using size: %llu bytes from struct" |
c66ac9db | 164 | " block_device blocks: %llu logical_block_size: %d\n", |
cd9323fd | 165 | dev_size, div_u64(dev_size, fd_dev->fd_block_size), |
c66ac9db NB |
166 | fd_dev->fd_block_size); |
167 | } else { | |
168 | if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { | |
6708bb27 | 169 | pr_err("FILEIO: Missing fd_dev_size=" |
c66ac9db NB |
170 | " parameter, and no backing struct" |
171 | " block_device\n"); | |
172 | goto fail; | |
173 | } | |
174 | ||
175 | limits = &dev_limits.limits; | |
176 | limits->logical_block_size = FD_BLOCKSIZE; | |
177 | limits->max_hw_sectors = FD_MAX_SECTORS; | |
178 | limits->max_sectors = FD_MAX_SECTORS; | |
179 | fd_dev->fd_block_size = FD_BLOCKSIZE; | |
180 | } | |
181 | ||
182 | dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; | |
183 | dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH; | |
184 | ||
185 | dev = transport_add_device_to_core_hba(hba, &fileio_template, | |
5951146d | 186 | se_dev, dev_flags, fd_dev, |
c66ac9db | 187 | &dev_limits, "FILEIO", FD_VERSION); |
6708bb27 | 188 | if (!dev) |
c66ac9db NB |
189 | goto fail; |
190 | ||
191 | fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; | |
192 | fd_dev->fd_queue_depth = dev->queue_depth; | |
193 | ||
6708bb27 | 194 | pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," |
c66ac9db NB |
195 | " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, |
196 | fd_dev->fd_dev_name, fd_dev->fd_dev_size); | |
197 | ||
c66ac9db NB |
198 | return dev; |
199 | fail: | |
200 | if (fd_dev->fd_file) { | |
201 | filp_close(fd_dev->fd_file, NULL); | |
202 | fd_dev->fd_file = NULL; | |
203 | } | |
613640e4 | 204 | return ERR_PTR(ret); |
c66ac9db NB |
205 | } |
206 | ||
207 | /* fd_free_device(): (Part of se_subsystem_api_t template) | |
208 | * | |
209 | * | |
210 | */ | |
211 | static void fd_free_device(void *p) | |
212 | { | |
8359cf43 | 213 | struct fd_dev *fd_dev = p; |
c66ac9db NB |
214 | |
215 | if (fd_dev->fd_file) { | |
216 | filp_close(fd_dev->fd_file, NULL); | |
217 | fd_dev->fd_file = NULL; | |
218 | } | |
219 | ||
220 | kfree(fd_dev); | |
221 | } | |
222 | ||
5787cacd CH |
223 | static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl, |
224 | u32 sgl_nents) | |
c66ac9db | 225 | { |
5787cacd | 226 | struct se_device *se_dev = cmd->se_dev; |
42bf829e | 227 | struct fd_dev *dev = se_dev->dev_ptr; |
6708bb27 | 228 | struct file *fd = dev->fd_file; |
5787cacd | 229 | struct scatterlist *sg; |
c66ac9db NB |
230 | struct iovec *iov; |
231 | mm_segment_t old_fs; | |
5787cacd | 232 | loff_t pos = (cmd->t_task_lba * |
42bf829e | 233 | se_dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
234 | int ret = 0, i; |
235 | ||
5787cacd | 236 | iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); |
6708bb27 AG |
237 | if (!iov) { |
238 | pr_err("Unable to allocate fd_do_readv iov[]\n"); | |
e3d6f909 | 239 | return -ENOMEM; |
c66ac9db NB |
240 | } |
241 | ||
5787cacd | 242 | for_each_sg(sgl, sg, sgl_nents, i) { |
9649fa1b SAS |
243 | iov[i].iov_len = sg->length; |
244 | iov[i].iov_base = sg_virt(sg); | |
c66ac9db NB |
245 | } |
246 | ||
247 | old_fs = get_fs(); | |
248 | set_fs(get_ds()); | |
5787cacd | 249 | ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); |
c66ac9db NB |
250 | set_fs(old_fs); |
251 | ||
252 | kfree(iov); | |
253 | /* | |
254 | * Return zeros and GOOD status even if the READ did not return | |
255 | * the expected virt_size for struct file w/o a backing struct | |
256 | * block_device. | |
257 | */ | |
258 | if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { | |
5787cacd | 259 | if (ret < 0 || ret != cmd->data_length) { |
6708bb27 | 260 | pr_err("vfs_readv() returned %d," |
c66ac9db | 261 | " expecting %d for S_ISBLK\n", ret, |
5787cacd | 262 | (int)cmd->data_length); |
e3d6f909 | 263 | return (ret < 0 ? ret : -EINVAL); |
c66ac9db NB |
264 | } |
265 | } else { | |
266 | if (ret < 0) { | |
6708bb27 | 267 | pr_err("vfs_readv() returned %d for non" |
c66ac9db | 268 | " S_ISBLK\n", ret); |
e3d6f909 | 269 | return ret; |
c66ac9db NB |
270 | } |
271 | } | |
272 | ||
273 | return 1; | |
274 | } | |
275 | ||
5787cacd CH |
276 | static int fd_do_writev(struct se_cmd *cmd, struct scatterlist *sgl, |
277 | u32 sgl_nents) | |
c66ac9db | 278 | { |
5787cacd | 279 | struct se_device *se_dev = cmd->se_dev; |
42bf829e | 280 | struct fd_dev *dev = se_dev->dev_ptr; |
6708bb27 | 281 | struct file *fd = dev->fd_file; |
5787cacd | 282 | struct scatterlist *sg; |
c66ac9db NB |
283 | struct iovec *iov; |
284 | mm_segment_t old_fs; | |
5787cacd | 285 | loff_t pos = (cmd->t_task_lba * |
42bf829e | 286 | se_dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
287 | int ret, i = 0; |
288 | ||
5787cacd | 289 | iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); |
6708bb27 AG |
290 | if (!iov) { |
291 | pr_err("Unable to allocate fd_do_writev iov[]\n"); | |
e3d6f909 | 292 | return -ENOMEM; |
c66ac9db NB |
293 | } |
294 | ||
5787cacd | 295 | for_each_sg(sgl, sg, sgl_nents, i) { |
9649fa1b SAS |
296 | iov[i].iov_len = sg->length; |
297 | iov[i].iov_base = sg_virt(sg); | |
c66ac9db NB |
298 | } |
299 | ||
300 | old_fs = get_fs(); | |
301 | set_fs(get_ds()); | |
5787cacd | 302 | ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); |
c66ac9db NB |
303 | set_fs(old_fs); |
304 | ||
305 | kfree(iov); | |
306 | ||
5787cacd | 307 | if (ret < 0 || ret != cmd->data_length) { |
6708bb27 | 308 | pr_err("vfs_writev() returned %d\n", ret); |
e3d6f909 | 309 | return (ret < 0 ? ret : -EINVAL); |
c66ac9db NB |
310 | } |
311 | ||
312 | return 1; | |
313 | } | |
314 | ||
ad67f0d9 | 315 | static int fd_execute_sync_cache(struct se_cmd *cmd) |
c66ac9db | 316 | { |
c66ac9db NB |
317 | struct se_device *dev = cmd->se_dev; |
318 | struct fd_dev *fd_dev = dev->dev_ptr; | |
a1d8b49a | 319 | int immed = (cmd->t_task_cdb[1] & 0x2); |
c66ac9db NB |
320 | loff_t start, end; |
321 | int ret; | |
322 | ||
323 | /* | |
324 | * If the Immediate bit is set, queue up the GOOD response | |
325 | * for this SYNCHRONIZE_CACHE op | |
326 | */ | |
327 | if (immed) | |
5787cacd | 328 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db NB |
329 | |
330 | /* | |
331 | * Determine if we will be flushing the entire device. | |
332 | */ | |
a1d8b49a | 333 | if (cmd->t_task_lba == 0 && cmd->data_length == 0) { |
c66ac9db NB |
334 | start = 0; |
335 | end = LLONG_MAX; | |
336 | } else { | |
a1d8b49a | 337 | start = cmd->t_task_lba * dev->se_sub_dev->se_dev_attrib.block_size; |
c66ac9db NB |
338 | if (cmd->data_length) |
339 | end = start + cmd->data_length; | |
340 | else | |
341 | end = LLONG_MAX; | |
342 | } | |
343 | ||
344 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); | |
345 | if (ret != 0) | |
6708bb27 | 346 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
c66ac9db | 347 | |
5787cacd | 348 | if (immed) |
ad67f0d9 | 349 | return 0; |
5787cacd CH |
350 | |
351 | if (ret) { | |
352 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
353 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); | |
354 | } else { | |
355 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
356 | } | |
ad67f0d9 CH |
357 | |
358 | return 0; | |
c66ac9db NB |
359 | } |
360 | ||
0c2ad7d1 | 361 | static int fd_execute_rw(struct se_cmd *cmd) |
c66ac9db | 362 | { |
0c2ad7d1 CH |
363 | struct scatterlist *sgl = cmd->t_data_sg; |
364 | u32 sgl_nents = cmd->t_data_nents; | |
365 | enum dma_data_direction data_direction = cmd->data_direction; | |
c66ac9db NB |
366 | struct se_device *dev = cmd->se_dev; |
367 | int ret = 0; | |
368 | ||
369 | /* | |
370 | * Call vectorized fileio functions to map struct scatterlist | |
371 | * physical memory addresses to struct iovec virtual memory. | |
372 | */ | |
5787cacd CH |
373 | if (data_direction == DMA_FROM_DEVICE) { |
374 | ret = fd_do_readv(cmd, sgl, sgl_nents); | |
c66ac9db | 375 | } else { |
5787cacd | 376 | ret = fd_do_writev(cmd, sgl, sgl_nents); |
a4dff304 NB |
377 | /* |
378 | * Perform implict vfs_fsync_range() for fd_do_writev() ops | |
379 | * for SCSI WRITEs with Forced Unit Access (FUA) set. | |
380 | * Allow this to happen independent of WCE=0 setting. | |
381 | */ | |
c66ac9db | 382 | if (ret > 0 && |
e3d6f909 | 383 | dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && |
2d3a4b51 | 384 | (cmd->se_cmd_flags & SCF_FUA)) { |
a4dff304 NB |
385 | struct fd_dev *fd_dev = dev->dev_ptr; |
386 | loff_t start = cmd->t_task_lba * | |
387 | dev->se_sub_dev->se_dev_attrib.block_size; | |
388 | loff_t end = start + cmd->data_length; | |
c66ac9db | 389 | |
a4dff304 NB |
390 | vfs_fsync_range(fd_dev->fd_file, start, end, 1); |
391 | } | |
c66ac9db NB |
392 | } |
393 | ||
03e98c9e NB |
394 | if (ret < 0) { |
395 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
c66ac9db | 396 | return ret; |
03e98c9e | 397 | } |
5787cacd CH |
398 | if (ret) |
399 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
03e98c9e | 400 | return 0; |
c66ac9db NB |
401 | } |
402 | ||
c66ac9db NB |
403 | enum { |
404 | Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err | |
405 | }; | |
406 | ||
407 | static match_table_t tokens = { | |
408 | {Opt_fd_dev_name, "fd_dev_name=%s"}, | |
409 | {Opt_fd_dev_size, "fd_dev_size=%s"}, | |
c66ac9db NB |
410 | {Opt_err, NULL} |
411 | }; | |
412 | ||
413 | static ssize_t fd_set_configfs_dev_params( | |
414 | struct se_hba *hba, | |
415 | struct se_subsystem_dev *se_dev, | |
416 | const char *page, ssize_t count) | |
417 | { | |
418 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; | |
419 | char *orig, *ptr, *arg_p, *opts; | |
420 | substring_t args[MAX_OPT_ARGS]; | |
a4dff304 | 421 | int ret = 0, token; |
c66ac9db NB |
422 | |
423 | opts = kstrdup(page, GFP_KERNEL); | |
424 | if (!opts) | |
425 | return -ENOMEM; | |
426 | ||
427 | orig = opts; | |
428 | ||
90c161b6 | 429 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
430 | if (!*ptr) |
431 | continue; | |
432 | ||
433 | token = match_token(ptr, tokens, args); | |
434 | switch (token) { | |
435 | case Opt_fd_dev_name: | |
dbc6e022 AV |
436 | if (match_strlcpy(fd_dev->fd_dev_name, &args[0], |
437 | FD_MAX_DEV_NAME) == 0) { | |
438 | ret = -EINVAL; | |
6d180253 JJ |
439 | break; |
440 | } | |
6708bb27 | 441 | pr_debug("FILEIO: Referencing Path: %s\n", |
c66ac9db NB |
442 | fd_dev->fd_dev_name); |
443 | fd_dev->fbd_flags |= FBDF_HAS_PATH; | |
444 | break; | |
445 | case Opt_fd_dev_size: | |
446 | arg_p = match_strdup(&args[0]); | |
6d180253 JJ |
447 | if (!arg_p) { |
448 | ret = -ENOMEM; | |
449 | break; | |
450 | } | |
c66ac9db | 451 | ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); |
6d180253 | 452 | kfree(arg_p); |
c66ac9db | 453 | if (ret < 0) { |
6708bb27 | 454 | pr_err("strict_strtoull() failed for" |
c66ac9db NB |
455 | " fd_dev_size=\n"); |
456 | goto out; | |
457 | } | |
6708bb27 | 458 | pr_debug("FILEIO: Referencing Size: %llu" |
c66ac9db NB |
459 | " bytes\n", fd_dev->fd_dev_size); |
460 | fd_dev->fbd_flags |= FBDF_HAS_SIZE; | |
461 | break; | |
c66ac9db NB |
462 | default: |
463 | break; | |
464 | } | |
465 | } | |
466 | ||
467 | out: | |
468 | kfree(orig); | |
469 | return (!ret) ? count : ret; | |
470 | } | |
471 | ||
472 | static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) | |
473 | { | |
8359cf43 | 474 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; |
c66ac9db NB |
475 | |
476 | if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { | |
6708bb27 | 477 | pr_err("Missing fd_dev_name=\n"); |
e3d6f909 | 478 | return -EINVAL; |
c66ac9db NB |
479 | } |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | static ssize_t fd_show_configfs_dev_params( | |
485 | struct se_hba *hba, | |
486 | struct se_subsystem_dev *se_dev, | |
487 | char *b) | |
488 | { | |
489 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; | |
490 | ssize_t bl = 0; | |
491 | ||
492 | bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); | |
a4dff304 NB |
493 | bl += sprintf(b + bl, " File: %s Size: %llu Mode: O_DSYNC\n", |
494 | fd_dev->fd_dev_name, fd_dev->fd_dev_size); | |
c66ac9db NB |
495 | return bl; |
496 | } | |
497 | ||
c66ac9db NB |
498 | /* fd_get_device_rev(): (Part of se_subsystem_api_t template) |
499 | * | |
500 | * | |
501 | */ | |
502 | static u32 fd_get_device_rev(struct se_device *dev) | |
503 | { | |
504 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
505 | } | |
506 | ||
507 | /* fd_get_device_type(): (Part of se_subsystem_api_t template) | |
508 | * | |
509 | * | |
510 | */ | |
511 | static u32 fd_get_device_type(struct se_device *dev) | |
512 | { | |
513 | return TYPE_DISK; | |
514 | } | |
515 | ||
516 | static sector_t fd_get_blocks(struct se_device *dev) | |
517 | { | |
518 | struct fd_dev *fd_dev = dev->dev_ptr; | |
cd9323fd NB |
519 | struct file *f = fd_dev->fd_file; |
520 | struct inode *i = f->f_mapping->host; | |
521 | unsigned long long dev_size; | |
522 | /* | |
523 | * When using a file that references an underlying struct block_device, | |
524 | * ensure dev_size is always based on the current inode size in order | |
525 | * to handle underlying block_device resize operations. | |
526 | */ | |
527 | if (S_ISBLK(i->i_mode)) | |
528 | dev_size = (i_size_read(i) - fd_dev->fd_block_size); | |
529 | else | |
530 | dev_size = fd_dev->fd_dev_size; | |
c66ac9db | 531 | |
cd9323fd | 532 | return div_u64(dev_size, dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
533 | } |
534 | ||
0c2ad7d1 CH |
535 | static struct spc_ops fd_spc_ops = { |
536 | .execute_rw = fd_execute_rw, | |
ad67f0d9 | 537 | .execute_sync_cache = fd_execute_sync_cache, |
0c2ad7d1 CH |
538 | }; |
539 | ||
540 | static int fd_parse_cdb(struct se_cmd *cmd) | |
541 | { | |
542 | return sbc_parse_cdb(cmd, &fd_spc_ops); | |
543 | } | |
544 | ||
c66ac9db NB |
545 | static struct se_subsystem_api fileio_template = { |
546 | .name = "fileio", | |
547 | .owner = THIS_MODULE, | |
548 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
f55918fa CH |
549 | .write_cache_emulated = 1, |
550 | .fua_write_emulated = 1, | |
c66ac9db NB |
551 | .attach_hba = fd_attach_hba, |
552 | .detach_hba = fd_detach_hba, | |
553 | .allocate_virtdevice = fd_allocate_virtdevice, | |
554 | .create_virtdevice = fd_create_virtdevice, | |
555 | .free_device = fd_free_device, | |
0c2ad7d1 | 556 | .parse_cdb = fd_parse_cdb, |
c66ac9db NB |
557 | .check_configfs_dev_params = fd_check_configfs_dev_params, |
558 | .set_configfs_dev_params = fd_set_configfs_dev_params, | |
559 | .show_configfs_dev_params = fd_show_configfs_dev_params, | |
c66ac9db NB |
560 | .get_device_rev = fd_get_device_rev, |
561 | .get_device_type = fd_get_device_type, | |
562 | .get_blocks = fd_get_blocks, | |
563 | }; | |
564 | ||
565 | static int __init fileio_module_init(void) | |
566 | { | |
567 | return transport_subsystem_register(&fileio_template); | |
568 | } | |
569 | ||
570 | static void fileio_module_exit(void) | |
571 | { | |
572 | transport_subsystem_release(&fileio_template); | |
573 | } | |
574 | ||
575 | MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); | |
576 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
577 | MODULE_LICENSE("GPL"); | |
578 | ||
579 | module_init(fileio_module_init); | |
580 | module_exit(fileio_module_exit); |