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 | { | |
112 | char *dev_p = NULL; | |
113 | struct se_device *dev; | |
114 | struct se_dev_limits dev_limits; | |
115 | struct queue_limits *limits; | |
8359cf43 JE |
116 | struct fd_dev *fd_dev = p; |
117 | struct fd_host *fd_host = hba->hba_ptr; | |
c66ac9db NB |
118 | mm_segment_t old_fs; |
119 | struct file *file; | |
120 | struct inode *inode = NULL; | |
613640e4 | 121 | int dev_flags = 0, flags, ret = -EINVAL; |
c66ac9db NB |
122 | |
123 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); | |
124 | ||
125 | old_fs = get_fs(); | |
126 | set_fs(get_ds()); | |
127 | dev_p = getname(fd_dev->fd_dev_name); | |
128 | set_fs(old_fs); | |
129 | ||
130 | if (IS_ERR(dev_p)) { | |
6708bb27 | 131 | pr_err("getname(%s) failed: %lu\n", |
c66ac9db | 132 | fd_dev->fd_dev_name, IS_ERR(dev_p)); |
613640e4 | 133 | ret = PTR_ERR(dev_p); |
c66ac9db NB |
134 | goto fail; |
135 | } | |
c66ac9db | 136 | /* |
a4dff304 NB |
137 | * Use O_DSYNC by default instead of O_SYNC to forgo syncing |
138 | * of pure timestamp updates. | |
c66ac9db | 139 | */ |
a4dff304 | 140 | flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; |
c66ac9db NB |
141 | |
142 | file = filp_open(dev_p, flags, 0600); | |
613640e4 | 143 | if (IS_ERR(file)) { |
6708bb27 | 144 | pr_err("filp_open(%s) failed\n", dev_p); |
613640e4 NB |
145 | ret = PTR_ERR(file); |
146 | goto fail; | |
147 | } | |
148 | if (!file || !file->f_dentry) { | |
6708bb27 | 149 | pr_err("filp_open(%s) failed\n", dev_p); |
c66ac9db NB |
150 | goto fail; |
151 | } | |
152 | fd_dev->fd_file = file; | |
153 | /* | |
154 | * If using a block backend with this struct file, we extract | |
155 | * fd_dev->fd_[block,dev]_size from struct block_device. | |
156 | * | |
157 | * Otherwise, we use the passed fd_size= from configfs | |
158 | */ | |
159 | inode = file->f_mapping->host; | |
160 | if (S_ISBLK(inode->i_mode)) { | |
161 | struct request_queue *q; | |
cd9323fd | 162 | unsigned long long dev_size; |
c66ac9db NB |
163 | /* |
164 | * Setup the local scope queue_limits from struct request_queue->limits | |
165 | * to pass into transport_add_device_to_core_hba() as struct se_dev_limits. | |
166 | */ | |
167 | q = bdev_get_queue(inode->i_bdev); | |
168 | limits = &dev_limits.limits; | |
169 | limits->logical_block_size = bdev_logical_block_size(inode->i_bdev); | |
170 | limits->max_hw_sectors = queue_max_hw_sectors(q); | |
171 | limits->max_sectors = queue_max_sectors(q); | |
172 | /* | |
173 | * Determine the number of bytes from i_size_read() minus | |
174 | * one (1) logical sector from underlying struct block_device | |
175 | */ | |
176 | fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); | |
cd9323fd | 177 | dev_size = (i_size_read(file->f_mapping->host) - |
c66ac9db NB |
178 | fd_dev->fd_block_size); |
179 | ||
6708bb27 | 180 | pr_debug("FILEIO: Using size: %llu bytes from struct" |
c66ac9db | 181 | " block_device blocks: %llu logical_block_size: %d\n", |
cd9323fd | 182 | dev_size, div_u64(dev_size, fd_dev->fd_block_size), |
c66ac9db NB |
183 | fd_dev->fd_block_size); |
184 | } else { | |
185 | if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { | |
6708bb27 | 186 | pr_err("FILEIO: Missing fd_dev_size=" |
c66ac9db NB |
187 | " parameter, and no backing struct" |
188 | " block_device\n"); | |
189 | goto fail; | |
190 | } | |
191 | ||
192 | limits = &dev_limits.limits; | |
193 | limits->logical_block_size = FD_BLOCKSIZE; | |
194 | limits->max_hw_sectors = FD_MAX_SECTORS; | |
195 | limits->max_sectors = FD_MAX_SECTORS; | |
196 | fd_dev->fd_block_size = FD_BLOCKSIZE; | |
197 | } | |
198 | ||
199 | dev_limits.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; | |
200 | dev_limits.queue_depth = FD_DEVICE_QUEUE_DEPTH; | |
201 | ||
202 | dev = transport_add_device_to_core_hba(hba, &fileio_template, | |
5951146d | 203 | se_dev, dev_flags, fd_dev, |
c66ac9db | 204 | &dev_limits, "FILEIO", FD_VERSION); |
6708bb27 | 205 | if (!dev) |
c66ac9db NB |
206 | goto fail; |
207 | ||
208 | fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; | |
209 | fd_dev->fd_queue_depth = dev->queue_depth; | |
210 | ||
6708bb27 | 211 | pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," |
c66ac9db NB |
212 | " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, |
213 | fd_dev->fd_dev_name, fd_dev->fd_dev_size); | |
214 | ||
215 | putname(dev_p); | |
216 | return dev; | |
217 | fail: | |
218 | if (fd_dev->fd_file) { | |
219 | filp_close(fd_dev->fd_file, NULL); | |
220 | fd_dev->fd_file = NULL; | |
221 | } | |
222 | putname(dev_p); | |
613640e4 | 223 | return ERR_PTR(ret); |
c66ac9db NB |
224 | } |
225 | ||
226 | /* fd_free_device(): (Part of se_subsystem_api_t template) | |
227 | * | |
228 | * | |
229 | */ | |
230 | static void fd_free_device(void *p) | |
231 | { | |
8359cf43 | 232 | struct fd_dev *fd_dev = p; |
c66ac9db NB |
233 | |
234 | if (fd_dev->fd_file) { | |
235 | filp_close(fd_dev->fd_file, NULL); | |
236 | fd_dev->fd_file = NULL; | |
237 | } | |
238 | ||
239 | kfree(fd_dev); | |
240 | } | |
241 | ||
5787cacd CH |
242 | static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl, |
243 | u32 sgl_nents) | |
c66ac9db | 244 | { |
5787cacd | 245 | struct se_device *se_dev = cmd->se_dev; |
42bf829e | 246 | struct fd_dev *dev = se_dev->dev_ptr; |
6708bb27 | 247 | struct file *fd = dev->fd_file; |
5787cacd | 248 | struct scatterlist *sg; |
c66ac9db NB |
249 | struct iovec *iov; |
250 | mm_segment_t old_fs; | |
5787cacd | 251 | loff_t pos = (cmd->t_task_lba * |
42bf829e | 252 | se_dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
253 | int ret = 0, i; |
254 | ||
5787cacd | 255 | iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); |
6708bb27 AG |
256 | if (!iov) { |
257 | pr_err("Unable to allocate fd_do_readv iov[]\n"); | |
e3d6f909 | 258 | return -ENOMEM; |
c66ac9db NB |
259 | } |
260 | ||
5787cacd | 261 | for_each_sg(sgl, sg, sgl_nents, i) { |
9649fa1b SAS |
262 | iov[i].iov_len = sg->length; |
263 | iov[i].iov_base = sg_virt(sg); | |
c66ac9db NB |
264 | } |
265 | ||
266 | old_fs = get_fs(); | |
267 | set_fs(get_ds()); | |
5787cacd | 268 | ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); |
c66ac9db NB |
269 | set_fs(old_fs); |
270 | ||
271 | kfree(iov); | |
272 | /* | |
273 | * Return zeros and GOOD status even if the READ did not return | |
274 | * the expected virt_size for struct file w/o a backing struct | |
275 | * block_device. | |
276 | */ | |
277 | if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { | |
5787cacd | 278 | if (ret < 0 || ret != cmd->data_length) { |
6708bb27 | 279 | pr_err("vfs_readv() returned %d," |
c66ac9db | 280 | " expecting %d for S_ISBLK\n", ret, |
5787cacd | 281 | (int)cmd->data_length); |
e3d6f909 | 282 | return (ret < 0 ? ret : -EINVAL); |
c66ac9db NB |
283 | } |
284 | } else { | |
285 | if (ret < 0) { | |
6708bb27 | 286 | pr_err("vfs_readv() returned %d for non" |
c66ac9db | 287 | " S_ISBLK\n", ret); |
e3d6f909 | 288 | return ret; |
c66ac9db NB |
289 | } |
290 | } | |
291 | ||
292 | return 1; | |
293 | } | |
294 | ||
5787cacd CH |
295 | static int fd_do_writev(struct se_cmd *cmd, struct scatterlist *sgl, |
296 | u32 sgl_nents) | |
c66ac9db | 297 | { |
5787cacd | 298 | struct se_device *se_dev = cmd->se_dev; |
42bf829e | 299 | struct fd_dev *dev = se_dev->dev_ptr; |
6708bb27 | 300 | struct file *fd = dev->fd_file; |
5787cacd | 301 | struct scatterlist *sg; |
c66ac9db NB |
302 | struct iovec *iov; |
303 | mm_segment_t old_fs; | |
5787cacd | 304 | loff_t pos = (cmd->t_task_lba * |
42bf829e | 305 | se_dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
306 | int ret, i = 0; |
307 | ||
5787cacd | 308 | iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); |
6708bb27 AG |
309 | if (!iov) { |
310 | pr_err("Unable to allocate fd_do_writev iov[]\n"); | |
e3d6f909 | 311 | return -ENOMEM; |
c66ac9db NB |
312 | } |
313 | ||
5787cacd | 314 | for_each_sg(sgl, sg, sgl_nents, i) { |
9649fa1b SAS |
315 | iov[i].iov_len = sg->length; |
316 | iov[i].iov_base = sg_virt(sg); | |
c66ac9db NB |
317 | } |
318 | ||
319 | old_fs = get_fs(); | |
320 | set_fs(get_ds()); | |
5787cacd | 321 | ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); |
c66ac9db NB |
322 | set_fs(old_fs); |
323 | ||
324 | kfree(iov); | |
325 | ||
5787cacd | 326 | if (ret < 0 || ret != cmd->data_length) { |
6708bb27 | 327 | pr_err("vfs_writev() returned %d\n", ret); |
e3d6f909 | 328 | return (ret < 0 ? ret : -EINVAL); |
c66ac9db NB |
329 | } |
330 | ||
331 | return 1; | |
332 | } | |
333 | ||
6bb35e00 | 334 | static void fd_emulate_sync_cache(struct se_cmd *cmd) |
c66ac9db | 335 | { |
c66ac9db NB |
336 | struct se_device *dev = cmd->se_dev; |
337 | struct fd_dev *fd_dev = dev->dev_ptr; | |
a1d8b49a | 338 | int immed = (cmd->t_task_cdb[1] & 0x2); |
c66ac9db NB |
339 | loff_t start, end; |
340 | int ret; | |
341 | ||
342 | /* | |
343 | * If the Immediate bit is set, queue up the GOOD response | |
344 | * for this SYNCHRONIZE_CACHE op | |
345 | */ | |
346 | if (immed) | |
5787cacd | 347 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db NB |
348 | |
349 | /* | |
350 | * Determine if we will be flushing the entire device. | |
351 | */ | |
a1d8b49a | 352 | if (cmd->t_task_lba == 0 && cmd->data_length == 0) { |
c66ac9db NB |
353 | start = 0; |
354 | end = LLONG_MAX; | |
355 | } else { | |
a1d8b49a | 356 | start = cmd->t_task_lba * dev->se_sub_dev->se_dev_attrib.block_size; |
c66ac9db NB |
357 | if (cmd->data_length) |
358 | end = start + cmd->data_length; | |
359 | else | |
360 | end = LLONG_MAX; | |
361 | } | |
362 | ||
363 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); | |
364 | if (ret != 0) | |
6708bb27 | 365 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
c66ac9db | 366 | |
5787cacd CH |
367 | if (immed) |
368 | return; | |
369 | ||
370 | if (ret) { | |
371 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
372 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); | |
373 | } else { | |
374 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
375 | } | |
c66ac9db NB |
376 | } |
377 | ||
5787cacd CH |
378 | static int fd_execute_cmd(struct se_cmd *cmd, struct scatterlist *sgl, |
379 | u32 sgl_nents, enum dma_data_direction data_direction) | |
c66ac9db | 380 | { |
c66ac9db NB |
381 | struct se_device *dev = cmd->se_dev; |
382 | int ret = 0; | |
383 | ||
384 | /* | |
385 | * Call vectorized fileio functions to map struct scatterlist | |
386 | * physical memory addresses to struct iovec virtual memory. | |
387 | */ | |
5787cacd CH |
388 | if (data_direction == DMA_FROM_DEVICE) { |
389 | ret = fd_do_readv(cmd, sgl, sgl_nents); | |
c66ac9db | 390 | } else { |
5787cacd | 391 | ret = fd_do_writev(cmd, sgl, sgl_nents); |
a4dff304 NB |
392 | /* |
393 | * Perform implict vfs_fsync_range() for fd_do_writev() ops | |
394 | * for SCSI WRITEs with Forced Unit Access (FUA) set. | |
395 | * Allow this to happen independent of WCE=0 setting. | |
396 | */ | |
c66ac9db | 397 | if (ret > 0 && |
e3d6f909 | 398 | dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 && |
2d3a4b51 | 399 | (cmd->se_cmd_flags & SCF_FUA)) { |
a4dff304 NB |
400 | struct fd_dev *fd_dev = dev->dev_ptr; |
401 | loff_t start = cmd->t_task_lba * | |
402 | dev->se_sub_dev->se_dev_attrib.block_size; | |
403 | loff_t end = start + cmd->data_length; | |
c66ac9db | 404 | |
a4dff304 NB |
405 | vfs_fsync_range(fd_dev->fd_file, start, end, 1); |
406 | } | |
c66ac9db NB |
407 | } |
408 | ||
03e98c9e NB |
409 | if (ret < 0) { |
410 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
c66ac9db | 411 | return ret; |
03e98c9e | 412 | } |
5787cacd CH |
413 | if (ret) |
414 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
03e98c9e | 415 | return 0; |
c66ac9db NB |
416 | } |
417 | ||
c66ac9db NB |
418 | enum { |
419 | Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err | |
420 | }; | |
421 | ||
422 | static match_table_t tokens = { | |
423 | {Opt_fd_dev_name, "fd_dev_name=%s"}, | |
424 | {Opt_fd_dev_size, "fd_dev_size=%s"}, | |
c66ac9db NB |
425 | {Opt_err, NULL} |
426 | }; | |
427 | ||
428 | static ssize_t fd_set_configfs_dev_params( | |
429 | struct se_hba *hba, | |
430 | struct se_subsystem_dev *se_dev, | |
431 | const char *page, ssize_t count) | |
432 | { | |
433 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; | |
434 | char *orig, *ptr, *arg_p, *opts; | |
435 | substring_t args[MAX_OPT_ARGS]; | |
a4dff304 | 436 | int ret = 0, token; |
c66ac9db NB |
437 | |
438 | opts = kstrdup(page, GFP_KERNEL); | |
439 | if (!opts) | |
440 | return -ENOMEM; | |
441 | ||
442 | orig = opts; | |
443 | ||
90c161b6 | 444 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
445 | if (!*ptr) |
446 | continue; | |
447 | ||
448 | token = match_token(ptr, tokens, args); | |
449 | switch (token) { | |
450 | case Opt_fd_dev_name: | |
6d180253 JJ |
451 | arg_p = match_strdup(&args[0]); |
452 | if (!arg_p) { | |
453 | ret = -ENOMEM; | |
454 | break; | |
455 | } | |
c66ac9db | 456 | snprintf(fd_dev->fd_dev_name, FD_MAX_DEV_NAME, |
6d180253 JJ |
457 | "%s", arg_p); |
458 | kfree(arg_p); | |
6708bb27 | 459 | pr_debug("FILEIO: Referencing Path: %s\n", |
c66ac9db NB |
460 | fd_dev->fd_dev_name); |
461 | fd_dev->fbd_flags |= FBDF_HAS_PATH; | |
462 | break; | |
463 | case Opt_fd_dev_size: | |
464 | arg_p = match_strdup(&args[0]); | |
6d180253 JJ |
465 | if (!arg_p) { |
466 | ret = -ENOMEM; | |
467 | break; | |
468 | } | |
c66ac9db | 469 | ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); |
6d180253 | 470 | kfree(arg_p); |
c66ac9db | 471 | if (ret < 0) { |
6708bb27 | 472 | pr_err("strict_strtoull() failed for" |
c66ac9db NB |
473 | " fd_dev_size=\n"); |
474 | goto out; | |
475 | } | |
6708bb27 | 476 | pr_debug("FILEIO: Referencing Size: %llu" |
c66ac9db NB |
477 | " bytes\n", fd_dev->fd_dev_size); |
478 | fd_dev->fbd_flags |= FBDF_HAS_SIZE; | |
479 | break; | |
c66ac9db NB |
480 | default: |
481 | break; | |
482 | } | |
483 | } | |
484 | ||
485 | out: | |
486 | kfree(orig); | |
487 | return (!ret) ? count : ret; | |
488 | } | |
489 | ||
490 | static ssize_t fd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) | |
491 | { | |
8359cf43 | 492 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; |
c66ac9db NB |
493 | |
494 | if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { | |
6708bb27 | 495 | pr_err("Missing fd_dev_name=\n"); |
e3d6f909 | 496 | return -EINVAL; |
c66ac9db NB |
497 | } |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
502 | static ssize_t fd_show_configfs_dev_params( | |
503 | struct se_hba *hba, | |
504 | struct se_subsystem_dev *se_dev, | |
505 | char *b) | |
506 | { | |
507 | struct fd_dev *fd_dev = se_dev->se_dev_su_ptr; | |
508 | ssize_t bl = 0; | |
509 | ||
510 | bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); | |
a4dff304 NB |
511 | bl += sprintf(b + bl, " File: %s Size: %llu Mode: O_DSYNC\n", |
512 | fd_dev->fd_dev_name, fd_dev->fd_dev_size); | |
c66ac9db NB |
513 | return bl; |
514 | } | |
515 | ||
c66ac9db NB |
516 | /* fd_get_device_rev(): (Part of se_subsystem_api_t template) |
517 | * | |
518 | * | |
519 | */ | |
520 | static u32 fd_get_device_rev(struct se_device *dev) | |
521 | { | |
522 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
523 | } | |
524 | ||
525 | /* fd_get_device_type(): (Part of se_subsystem_api_t template) | |
526 | * | |
527 | * | |
528 | */ | |
529 | static u32 fd_get_device_type(struct se_device *dev) | |
530 | { | |
531 | return TYPE_DISK; | |
532 | } | |
533 | ||
534 | static sector_t fd_get_blocks(struct se_device *dev) | |
535 | { | |
536 | struct fd_dev *fd_dev = dev->dev_ptr; | |
cd9323fd NB |
537 | struct file *f = fd_dev->fd_file; |
538 | struct inode *i = f->f_mapping->host; | |
539 | unsigned long long dev_size; | |
540 | /* | |
541 | * When using a file that references an underlying struct block_device, | |
542 | * ensure dev_size is always based on the current inode size in order | |
543 | * to handle underlying block_device resize operations. | |
544 | */ | |
545 | if (S_ISBLK(i->i_mode)) | |
546 | dev_size = (i_size_read(i) - fd_dev->fd_block_size); | |
547 | else | |
548 | dev_size = fd_dev->fd_dev_size; | |
c66ac9db | 549 | |
cd9323fd | 550 | return div_u64(dev_size, dev->se_sub_dev->se_dev_attrib.block_size); |
c66ac9db NB |
551 | } |
552 | ||
553 | static struct se_subsystem_api fileio_template = { | |
554 | .name = "fileio", | |
555 | .owner = THIS_MODULE, | |
556 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
f55918fa CH |
557 | .write_cache_emulated = 1, |
558 | .fua_write_emulated = 1, | |
c66ac9db NB |
559 | .attach_hba = fd_attach_hba, |
560 | .detach_hba = fd_detach_hba, | |
561 | .allocate_virtdevice = fd_allocate_virtdevice, | |
562 | .create_virtdevice = fd_create_virtdevice, | |
563 | .free_device = fd_free_device, | |
5787cacd | 564 | .execute_cmd = fd_execute_cmd, |
c66ac9db | 565 | .do_sync_cache = fd_emulate_sync_cache, |
c66ac9db NB |
566 | .check_configfs_dev_params = fd_check_configfs_dev_params, |
567 | .set_configfs_dev_params = fd_set_configfs_dev_params, | |
568 | .show_configfs_dev_params = fd_show_configfs_dev_params, | |
c66ac9db NB |
569 | .get_device_rev = fd_get_device_rev, |
570 | .get_device_type = fd_get_device_type, | |
571 | .get_blocks = fd_get_blocks, | |
572 | }; | |
573 | ||
574 | static int __init fileio_module_init(void) | |
575 | { | |
576 | return transport_subsystem_register(&fileio_template); | |
577 | } | |
578 | ||
579 | static void fileio_module_exit(void) | |
580 | { | |
581 | transport_subsystem_release(&fileio_template); | |
582 | } | |
583 | ||
584 | MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); | |
585 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
586 | MODULE_LICENSE("GPL"); | |
587 | ||
588 | module_init(fileio_module_init); | |
589 | module_exit(fileio_module_exit); |