Commit | Line | Data |
---|---|---|
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 | ||
0fd97ccf CH |
44 | static inline struct fd_dev *FD_DEV(struct se_device *dev) |
45 | { | |
46 | return container_of(dev, struct fd_dev, dev); | |
47 | } | |
c66ac9db NB |
48 | |
49 | /* fd_attach_hba(): (Part of se_subsystem_api_t template) | |
50 | * | |
51 | * | |
52 | */ | |
53 | static int fd_attach_hba(struct se_hba *hba, u32 host_id) | |
54 | { | |
55 | struct fd_host *fd_host; | |
56 | ||
57 | fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); | |
6708bb27 AG |
58 | if (!fd_host) { |
59 | pr_err("Unable to allocate memory for struct fd_host\n"); | |
e3d6f909 | 60 | return -ENOMEM; |
c66ac9db NB |
61 | } |
62 | ||
63 | fd_host->fd_host_id = host_id; | |
64 | ||
e3d6f909 | 65 | hba->hba_ptr = fd_host; |
c66ac9db | 66 | |
6708bb27 | 67 | pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" |
c66ac9db NB |
68 | " Target Core Stack %s\n", hba->hba_id, FD_VERSION, |
69 | TARGET_CORE_MOD_VERSION); | |
6708bb27 | 70 | pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" |
e3d6f909 AG |
71 | " MaxSectors: %u\n", |
72 | hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); | |
c66ac9db NB |
73 | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static void fd_detach_hba(struct se_hba *hba) | |
78 | { | |
79 | struct fd_host *fd_host = hba->hba_ptr; | |
80 | ||
6708bb27 | 81 | pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" |
c66ac9db NB |
82 | " Target Core\n", hba->hba_id, fd_host->fd_host_id); |
83 | ||
84 | kfree(fd_host); | |
85 | hba->hba_ptr = NULL; | |
86 | } | |
87 | ||
0fd97ccf | 88 | static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) |
c66ac9db NB |
89 | { |
90 | struct fd_dev *fd_dev; | |
8359cf43 | 91 | struct fd_host *fd_host = hba->hba_ptr; |
c66ac9db NB |
92 | |
93 | fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); | |
6708bb27 AG |
94 | if (!fd_dev) { |
95 | pr_err("Unable to allocate memory for struct fd_dev\n"); | |
c66ac9db NB |
96 | return NULL; |
97 | } | |
98 | ||
99 | fd_dev->fd_host = fd_host; | |
100 | ||
6708bb27 | 101 | pr_debug("FILEIO: Allocated fd_dev for %p\n", name); |
c66ac9db | 102 | |
0fd97ccf | 103 | return &fd_dev->dev; |
c66ac9db NB |
104 | } |
105 | ||
0fd97ccf | 106 | static int fd_configure_device(struct se_device *dev) |
c66ac9db | 107 | { |
0fd97ccf CH |
108 | struct fd_dev *fd_dev = FD_DEV(dev); |
109 | struct fd_host *fd_host = dev->se_hba->hba_ptr; | |
c66ac9db NB |
110 | struct file *file; |
111 | struct inode *inode = NULL; | |
0fd97ccf | 112 | int flags, ret = -EINVAL; |
c66ac9db | 113 | |
0fd97ccf CH |
114 | if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { |
115 | pr_err("Missing fd_dev_name=\n"); | |
116 | return -EINVAL; | |
117 | } | |
c66ac9db | 118 | |
c66ac9db | 119 | /* |
a4dff304 NB |
120 | * Use O_DSYNC by default instead of O_SYNC to forgo syncing |
121 | * of pure timestamp updates. | |
c66ac9db | 122 | */ |
a4dff304 | 123 | flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; |
0fd97ccf | 124 | |
b32f4c7e NB |
125 | /* |
126 | * Optionally allow fd_buffered_io=1 to be enabled for people | |
127 | * who want use the fs buffer cache as an WriteCache mechanism. | |
128 | * | |
129 | * This means that in event of a hard failure, there is a risk | |
130 | * of silent data-loss if the SCSI client has *not* performed a | |
131 | * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE | |
132 | * to write-out the entire device cache. | |
133 | */ | |
134 | if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { | |
135 | pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); | |
136 | flags &= ~O_DSYNC; | |
137 | } | |
c66ac9db | 138 | |
dbc6e022 | 139 | file = filp_open(fd_dev->fd_dev_name, flags, 0600); |
613640e4 | 140 | if (IS_ERR(file)) { |
dbc6e022 | 141 | pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); |
613640e4 NB |
142 | ret = PTR_ERR(file); |
143 | goto fail; | |
144 | } | |
c66ac9db NB |
145 | fd_dev->fd_file = file; |
146 | /* | |
147 | * If using a block backend with this struct file, we extract | |
148 | * fd_dev->fd_[block,dev]_size from struct block_device. | |
149 | * | |
150 | * Otherwise, we use the passed fd_size= from configfs | |
151 | */ | |
152 | inode = file->f_mapping->host; | |
153 | if (S_ISBLK(inode->i_mode)) { | |
0fd97ccf | 154 | struct request_queue *q = bdev_get_queue(inode->i_bdev); |
cd9323fd | 155 | unsigned long long dev_size; |
0fd97ccf CH |
156 | |
157 | dev->dev_attrib.hw_block_size = | |
158 | bdev_logical_block_size(inode->i_bdev); | |
159 | dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); | |
160 | ||
c66ac9db NB |
161 | /* |
162 | * Determine the number of bytes from i_size_read() minus | |
163 | * one (1) logical sector from underlying struct block_device | |
164 | */ | |
cd9323fd | 165 | dev_size = (i_size_read(file->f_mapping->host) - |
c66ac9db NB |
166 | fd_dev->fd_block_size); |
167 | ||
6708bb27 | 168 | pr_debug("FILEIO: Using size: %llu bytes from struct" |
c66ac9db | 169 | " block_device blocks: %llu logical_block_size: %d\n", |
cd9323fd | 170 | dev_size, div_u64(dev_size, fd_dev->fd_block_size), |
c66ac9db NB |
171 | fd_dev->fd_block_size); |
172 | } else { | |
173 | if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { | |
6708bb27 | 174 | pr_err("FILEIO: Missing fd_dev_size=" |
c66ac9db NB |
175 | " parameter, and no backing struct" |
176 | " block_device\n"); | |
177 | goto fail; | |
178 | } | |
179 | ||
0fd97ccf CH |
180 | dev->dev_attrib.hw_block_size = FD_BLOCKSIZE; |
181 | dev->dev_attrib.hw_max_sectors = FD_MAX_SECTORS; | |
c66ac9db NB |
182 | } |
183 | ||
0fd97ccf | 184 | fd_dev->fd_block_size = dev->dev_attrib.hw_block_size; |
c66ac9db | 185 | |
0fd97ccf | 186 | dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; |
c66ac9db | 187 | |
b32f4c7e NB |
188 | if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { |
189 | pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" | |
190 | " with FDBD_HAS_BUFFERED_IO_WCE\n"); | |
0fd97ccf | 191 | dev->dev_attrib.emulate_write_cache = 1; |
b32f4c7e NB |
192 | } |
193 | ||
c66ac9db NB |
194 | fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; |
195 | fd_dev->fd_queue_depth = dev->queue_depth; | |
196 | ||
6708bb27 | 197 | pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," |
c66ac9db NB |
198 | " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, |
199 | fd_dev->fd_dev_name, fd_dev->fd_dev_size); | |
200 | ||
0fd97ccf | 201 | return 0; |
c66ac9db NB |
202 | fail: |
203 | if (fd_dev->fd_file) { | |
204 | filp_close(fd_dev->fd_file, NULL); | |
205 | fd_dev->fd_file = NULL; | |
206 | } | |
0fd97ccf | 207 | return ret; |
c66ac9db NB |
208 | } |
209 | ||
0fd97ccf | 210 | static void fd_free_device(struct se_device *dev) |
c66ac9db | 211 | { |
0fd97ccf | 212 | struct fd_dev *fd_dev = FD_DEV(dev); |
c66ac9db NB |
213 | |
214 | if (fd_dev->fd_file) { | |
215 | filp_close(fd_dev->fd_file, NULL); | |
216 | fd_dev->fd_file = NULL; | |
217 | } | |
218 | ||
219 | kfree(fd_dev); | |
220 | } | |
221 | ||
5787cacd CH |
222 | static int fd_do_readv(struct se_cmd *cmd, struct scatterlist *sgl, |
223 | u32 sgl_nents) | |
c66ac9db | 224 | { |
5787cacd | 225 | struct se_device *se_dev = cmd->se_dev; |
0fd97ccf | 226 | struct fd_dev *dev = FD_DEV(se_dev); |
6708bb27 | 227 | struct file *fd = dev->fd_file; |
5787cacd | 228 | struct scatterlist *sg; |
c66ac9db NB |
229 | struct iovec *iov; |
230 | mm_segment_t old_fs; | |
0fd97ccf | 231 | loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); |
c66ac9db NB |
232 | int ret = 0, i; |
233 | ||
5787cacd | 234 | iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); |
6708bb27 AG |
235 | if (!iov) { |
236 | pr_err("Unable to allocate fd_do_readv iov[]\n"); | |
e3d6f909 | 237 | return -ENOMEM; |
c66ac9db NB |
238 | } |
239 | ||
5787cacd | 240 | for_each_sg(sgl, sg, sgl_nents, i) { |
9649fa1b SAS |
241 | iov[i].iov_len = sg->length; |
242 | iov[i].iov_base = sg_virt(sg); | |
c66ac9db NB |
243 | } |
244 | ||
245 | old_fs = get_fs(); | |
246 | set_fs(get_ds()); | |
5787cacd | 247 | ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); |
c66ac9db NB |
248 | set_fs(old_fs); |
249 | ||
250 | kfree(iov); | |
251 | /* | |
252 | * Return zeros and GOOD status even if the READ did not return | |
253 | * the expected virt_size for struct file w/o a backing struct | |
254 | * block_device. | |
255 | */ | |
256 | if (S_ISBLK(fd->f_dentry->d_inode->i_mode)) { | |
5787cacd | 257 | if (ret < 0 || ret != cmd->data_length) { |
6708bb27 | 258 | pr_err("vfs_readv() returned %d," |
c66ac9db | 259 | " expecting %d for S_ISBLK\n", ret, |
5787cacd | 260 | (int)cmd->data_length); |
e3d6f909 | 261 | return (ret < 0 ? ret : -EINVAL); |
c66ac9db NB |
262 | } |
263 | } else { | |
264 | if (ret < 0) { | |
6708bb27 | 265 | pr_err("vfs_readv() returned %d for non" |
c66ac9db | 266 | " S_ISBLK\n", ret); |
e3d6f909 | 267 | return ret; |
c66ac9db NB |
268 | } |
269 | } | |
270 | ||
271 | return 1; | |
272 | } | |
273 | ||
5787cacd CH |
274 | static int fd_do_writev(struct se_cmd *cmd, struct scatterlist *sgl, |
275 | u32 sgl_nents) | |
c66ac9db | 276 | { |
5787cacd | 277 | struct se_device *se_dev = cmd->se_dev; |
0fd97ccf | 278 | struct fd_dev *dev = FD_DEV(se_dev); |
6708bb27 | 279 | struct file *fd = dev->fd_file; |
5787cacd | 280 | struct scatterlist *sg; |
c66ac9db NB |
281 | struct iovec *iov; |
282 | mm_segment_t old_fs; | |
0fd97ccf | 283 | loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); |
c66ac9db NB |
284 | int ret, i = 0; |
285 | ||
5787cacd | 286 | iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); |
6708bb27 AG |
287 | if (!iov) { |
288 | pr_err("Unable to allocate fd_do_writev iov[]\n"); | |
e3d6f909 | 289 | return -ENOMEM; |
c66ac9db NB |
290 | } |
291 | ||
5787cacd | 292 | for_each_sg(sgl, sg, sgl_nents, i) { |
9649fa1b SAS |
293 | iov[i].iov_len = sg->length; |
294 | iov[i].iov_base = sg_virt(sg); | |
c66ac9db NB |
295 | } |
296 | ||
297 | old_fs = get_fs(); | |
298 | set_fs(get_ds()); | |
5787cacd | 299 | ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); |
c66ac9db NB |
300 | set_fs(old_fs); |
301 | ||
302 | kfree(iov); | |
303 | ||
5787cacd | 304 | if (ret < 0 || ret != cmd->data_length) { |
6708bb27 | 305 | pr_err("vfs_writev() returned %d\n", ret); |
e3d6f909 | 306 | return (ret < 0 ? ret : -EINVAL); |
c66ac9db NB |
307 | } |
308 | ||
309 | return 1; | |
310 | } | |
311 | ||
ad67f0d9 | 312 | static int fd_execute_sync_cache(struct se_cmd *cmd) |
c66ac9db | 313 | { |
c66ac9db | 314 | struct se_device *dev = cmd->se_dev; |
0fd97ccf | 315 | struct fd_dev *fd_dev = FD_DEV(dev); |
a1d8b49a | 316 | int immed = (cmd->t_task_cdb[1] & 0x2); |
c66ac9db NB |
317 | loff_t start, end; |
318 | int ret; | |
319 | ||
320 | /* | |
321 | * If the Immediate bit is set, queue up the GOOD response | |
322 | * for this SYNCHRONIZE_CACHE op | |
323 | */ | |
324 | if (immed) | |
5787cacd | 325 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
c66ac9db NB |
326 | |
327 | /* | |
328 | * Determine if we will be flushing the entire device. | |
329 | */ | |
a1d8b49a | 330 | if (cmd->t_task_lba == 0 && cmd->data_length == 0) { |
c66ac9db NB |
331 | start = 0; |
332 | end = LLONG_MAX; | |
333 | } else { | |
0fd97ccf | 334 | start = cmd->t_task_lba * dev->dev_attrib.block_size; |
c66ac9db NB |
335 | if (cmd->data_length) |
336 | end = start + cmd->data_length; | |
337 | else | |
338 | end = LLONG_MAX; | |
339 | } | |
340 | ||
341 | ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); | |
342 | if (ret != 0) | |
6708bb27 | 343 | pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); |
c66ac9db | 344 | |
5787cacd | 345 | if (immed) |
ad67f0d9 | 346 | return 0; |
5787cacd CH |
347 | |
348 | if (ret) { | |
349 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
350 | target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); | |
351 | } else { | |
352 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
353 | } | |
ad67f0d9 CH |
354 | |
355 | return 0; | |
c66ac9db NB |
356 | } |
357 | ||
0c2ad7d1 | 358 | static int fd_execute_rw(struct se_cmd *cmd) |
c66ac9db | 359 | { |
0c2ad7d1 CH |
360 | struct scatterlist *sgl = cmd->t_data_sg; |
361 | u32 sgl_nents = cmd->t_data_nents; | |
362 | enum dma_data_direction data_direction = cmd->data_direction; | |
c66ac9db NB |
363 | struct se_device *dev = cmd->se_dev; |
364 | int ret = 0; | |
365 | ||
366 | /* | |
367 | * Call vectorized fileio functions to map struct scatterlist | |
368 | * physical memory addresses to struct iovec virtual memory. | |
369 | */ | |
5787cacd CH |
370 | if (data_direction == DMA_FROM_DEVICE) { |
371 | ret = fd_do_readv(cmd, sgl, sgl_nents); | |
c66ac9db | 372 | } else { |
5787cacd | 373 | ret = fd_do_writev(cmd, sgl, sgl_nents); |
a4dff304 NB |
374 | /* |
375 | * Perform implict vfs_fsync_range() for fd_do_writev() ops | |
376 | * for SCSI WRITEs with Forced Unit Access (FUA) set. | |
377 | * Allow this to happen independent of WCE=0 setting. | |
378 | */ | |
c66ac9db | 379 | if (ret > 0 && |
0fd97ccf | 380 | dev->dev_attrib.emulate_fua_write > 0 && |
2d3a4b51 | 381 | (cmd->se_cmd_flags & SCF_FUA)) { |
0fd97ccf | 382 | struct fd_dev *fd_dev = FD_DEV(dev); |
a4dff304 | 383 | loff_t start = cmd->t_task_lba * |
0fd97ccf | 384 | dev->dev_attrib.block_size; |
a4dff304 | 385 | loff_t end = start + cmd->data_length; |
c66ac9db | 386 | |
a4dff304 NB |
387 | vfs_fsync_range(fd_dev->fd_file, start, end, 1); |
388 | } | |
c66ac9db NB |
389 | } |
390 | ||
03e98c9e NB |
391 | if (ret < 0) { |
392 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; | |
c66ac9db | 393 | return ret; |
03e98c9e | 394 | } |
5787cacd CH |
395 | if (ret) |
396 | target_complete_cmd(cmd, SAM_STAT_GOOD); | |
03e98c9e | 397 | return 0; |
c66ac9db NB |
398 | } |
399 | ||
c66ac9db NB |
400 | enum { |
401 | Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err | |
402 | }; | |
403 | ||
404 | static match_table_t tokens = { | |
405 | {Opt_fd_dev_name, "fd_dev_name=%s"}, | |
406 | {Opt_fd_dev_size, "fd_dev_size=%s"}, | |
b32f4c7e | 407 | {Opt_fd_buffered_io, "fd_buffered_io=%d"}, |
c66ac9db NB |
408 | {Opt_err, NULL} |
409 | }; | |
410 | ||
0fd97ccf CH |
411 | static ssize_t fd_set_configfs_dev_params(struct se_device *dev, |
412 | const char *page, ssize_t count) | |
c66ac9db | 413 | { |
0fd97ccf | 414 | struct fd_dev *fd_dev = FD_DEV(dev); |
c66ac9db NB |
415 | char *orig, *ptr, *arg_p, *opts; |
416 | substring_t args[MAX_OPT_ARGS]; | |
b32f4c7e | 417 | int ret = 0, arg, token; |
c66ac9db NB |
418 | |
419 | opts = kstrdup(page, GFP_KERNEL); | |
420 | if (!opts) | |
421 | return -ENOMEM; | |
422 | ||
423 | orig = opts; | |
424 | ||
90c161b6 | 425 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
c66ac9db NB |
426 | if (!*ptr) |
427 | continue; | |
428 | ||
429 | token = match_token(ptr, tokens, args); | |
430 | switch (token) { | |
431 | case Opt_fd_dev_name: | |
dbc6e022 AV |
432 | if (match_strlcpy(fd_dev->fd_dev_name, &args[0], |
433 | FD_MAX_DEV_NAME) == 0) { | |
434 | ret = -EINVAL; | |
6d180253 JJ |
435 | break; |
436 | } | |
6708bb27 | 437 | pr_debug("FILEIO: Referencing Path: %s\n", |
c66ac9db NB |
438 | fd_dev->fd_dev_name); |
439 | fd_dev->fbd_flags |= FBDF_HAS_PATH; | |
440 | break; | |
441 | case Opt_fd_dev_size: | |
442 | arg_p = match_strdup(&args[0]); | |
6d180253 JJ |
443 | if (!arg_p) { |
444 | ret = -ENOMEM; | |
445 | break; | |
446 | } | |
c66ac9db | 447 | ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); |
6d180253 | 448 | kfree(arg_p); |
c66ac9db | 449 | if (ret < 0) { |
6708bb27 | 450 | pr_err("strict_strtoull() failed for" |
c66ac9db NB |
451 | " fd_dev_size=\n"); |
452 | goto out; | |
453 | } | |
6708bb27 | 454 | pr_debug("FILEIO: Referencing Size: %llu" |
c66ac9db NB |
455 | " bytes\n", fd_dev->fd_dev_size); |
456 | fd_dev->fbd_flags |= FBDF_HAS_SIZE; | |
457 | break; | |
b32f4c7e NB |
458 | case Opt_fd_buffered_io: |
459 | match_int(args, &arg); | |
460 | if (arg != 1) { | |
461 | pr_err("bogus fd_buffered_io=%d value\n", arg); | |
462 | ret = -EINVAL; | |
463 | goto out; | |
464 | } | |
465 | ||
466 | pr_debug("FILEIO: Using buffered I/O" | |
467 | " operations for struct fd_dev\n"); | |
468 | ||
469 | fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; | |
470 | break; | |
c66ac9db NB |
471 | default: |
472 | break; | |
473 | } | |
474 | } | |
475 | ||
476 | out: | |
477 | kfree(orig); | |
478 | return (!ret) ? count : ret; | |
479 | } | |
480 | ||
0fd97ccf | 481 | static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) |
c66ac9db | 482 | { |
0fd97ccf | 483 | struct fd_dev *fd_dev = FD_DEV(dev); |
c66ac9db NB |
484 | ssize_t bl = 0; |
485 | ||
486 | bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); | |
b32f4c7e NB |
487 | bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", |
488 | fd_dev->fd_dev_name, fd_dev->fd_dev_size, | |
489 | (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? | |
490 | "Buffered-WCE" : "O_DSYNC"); | |
c66ac9db NB |
491 | return bl; |
492 | } | |
493 | ||
c66ac9db NB |
494 | /* fd_get_device_rev(): (Part of se_subsystem_api_t template) |
495 | * | |
496 | * | |
497 | */ | |
498 | static u32 fd_get_device_rev(struct se_device *dev) | |
499 | { | |
500 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ | |
501 | } | |
502 | ||
503 | /* fd_get_device_type(): (Part of se_subsystem_api_t template) | |
504 | * | |
505 | * | |
506 | */ | |
507 | static u32 fd_get_device_type(struct se_device *dev) | |
508 | { | |
509 | return TYPE_DISK; | |
510 | } | |
511 | ||
512 | static sector_t fd_get_blocks(struct se_device *dev) | |
513 | { | |
0fd97ccf | 514 | struct fd_dev *fd_dev = FD_DEV(dev); |
cd9323fd NB |
515 | struct file *f = fd_dev->fd_file; |
516 | struct inode *i = f->f_mapping->host; | |
517 | unsigned long long dev_size; | |
518 | /* | |
519 | * When using a file that references an underlying struct block_device, | |
520 | * ensure dev_size is always based on the current inode size in order | |
521 | * to handle underlying block_device resize operations. | |
522 | */ | |
523 | if (S_ISBLK(i->i_mode)) | |
524 | dev_size = (i_size_read(i) - fd_dev->fd_block_size); | |
525 | else | |
526 | dev_size = fd_dev->fd_dev_size; | |
c66ac9db | 527 | |
0fd97ccf | 528 | return div_u64(dev_size, dev->dev_attrib.block_size); |
c66ac9db NB |
529 | } |
530 | ||
0c2ad7d1 CH |
531 | static struct spc_ops fd_spc_ops = { |
532 | .execute_rw = fd_execute_rw, | |
ad67f0d9 | 533 | .execute_sync_cache = fd_execute_sync_cache, |
0c2ad7d1 CH |
534 | }; |
535 | ||
536 | static int fd_parse_cdb(struct se_cmd *cmd) | |
537 | { | |
538 | return sbc_parse_cdb(cmd, &fd_spc_ops); | |
539 | } | |
540 | ||
c66ac9db NB |
541 | static struct se_subsystem_api fileio_template = { |
542 | .name = "fileio", | |
0fd97ccf CH |
543 | .inquiry_prod = "FILEIO", |
544 | .inquiry_rev = FD_VERSION, | |
c66ac9db NB |
545 | .owner = THIS_MODULE, |
546 | .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, | |
547 | .attach_hba = fd_attach_hba, | |
548 | .detach_hba = fd_detach_hba, | |
0fd97ccf CH |
549 | .alloc_device = fd_alloc_device, |
550 | .configure_device = fd_configure_device, | |
c66ac9db | 551 | .free_device = fd_free_device, |
0c2ad7d1 | 552 | .parse_cdb = fd_parse_cdb, |
c66ac9db NB |
553 | .set_configfs_dev_params = fd_set_configfs_dev_params, |
554 | .show_configfs_dev_params = fd_show_configfs_dev_params, | |
c66ac9db NB |
555 | .get_device_rev = fd_get_device_rev, |
556 | .get_device_type = fd_get_device_type, | |
557 | .get_blocks = fd_get_blocks, | |
558 | }; | |
559 | ||
560 | static int __init fileio_module_init(void) | |
561 | { | |
562 | return transport_subsystem_register(&fileio_template); | |
563 | } | |
564 | ||
565 | static void fileio_module_exit(void) | |
566 | { | |
567 | transport_subsystem_release(&fileio_template); | |
568 | } | |
569 | ||
570 | MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); | |
571 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
572 | MODULE_LICENSE("GPL"); | |
573 | ||
574 | module_init(fileio_module_init); | |
575 | module_exit(fileio_module_exit); |