Commit | Line | Data |
---|---|---|
e69e7fe5 EVH |
1 | /* |
2 | * linux/fs/9p/vfs_file.c | |
3 | * | |
4 | * This file contians vfs file ops for 9P2000. | |
5 | * | |
6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
42e8c509 EVH |
10 | * it under the terms of the GNU General Public License version 2 |
11 | * as published by the Free Software Foundation. | |
e69e7fe5 EVH |
12 | * |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to: | |
20 | * Free Software Foundation | |
21 | * 51 Franklin Street, Fifth Floor | |
22 | * Boston, MA 02111-1301 USA | |
23 | * | |
24 | */ | |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/fs.h> | |
914e2637 | 29 | #include <linux/sched.h> |
e69e7fe5 EVH |
30 | #include <linux/file.h> |
31 | #include <linux/stat.h> | |
32 | #include <linux/string.h> | |
e69e7fe5 | 33 | #include <linux/inet.h> |
e69e7fe5 | 34 | #include <linux/list.h> |
637d020a | 35 | #include <linux/pagemap.h> |
a099027c | 36 | #include <linux/utsname.h> |
e69e7fe5 EVH |
37 | #include <asm/uaccess.h> |
38 | #include <linux/idr.h> | |
bd238fb4 LI |
39 | #include <net/9p/9p.h> |
40 | #include <net/9p/client.h> | |
e69e7fe5 | 41 | |
e69e7fe5 | 42 | #include "v9fs.h" |
e69e7fe5 EVH |
43 | #include "v9fs_vfs.h" |
44 | #include "fid.h" | |
60e78d2c | 45 | #include "cache.h" |
e69e7fe5 | 46 | |
7263cebe AK |
47 | static const struct vm_operations_struct v9fs_file_vm_ops; |
48 | ||
e69e7fe5 EVH |
49 | /** |
50 | * v9fs_file_open - open a file (or directory) | |
51 | * @inode: inode to be opened | |
52 | * @file: file being opened | |
53 | * | |
54 | */ | |
55 | ||
56 | int v9fs_file_open(struct inode *inode, struct file *file) | |
57 | { | |
6a3124a3 | 58 | int err; |
6b39f6d2 | 59 | struct v9fs_inode *v9inode; |
bd238fb4 LI |
60 | struct v9fs_session_info *v9ses; |
61 | struct p9_fid *fid; | |
62 | int omode; | |
e69e7fe5 | 63 | |
ef56547e | 64 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file); |
6b39f6d2 | 65 | v9inode = V9FS_I(inode); |
bd238fb4 | 66 | v9ses = v9fs_inode2v9ses(inode); |
ef56547e | 67 | if (v9fs_proto_dotl(v9ses)) |
f88657ce | 68 | omode = v9fs_open_to_dotl_flags(file->f_flags); |
ef56547e MK |
69 | else |
70 | omode = v9fs_uflags2omode(file->f_flags, | |
71 | v9fs_proto_dotu(v9ses)); | |
bd238fb4 LI |
72 | fid = file->private_data; |
73 | if (!fid) { | |
74 | fid = v9fs_fid_clone(file->f_path.dentry); | |
75 | if (IS_ERR(fid)) | |
76 | return PTR_ERR(fid); | |
77 | ||
78 | err = p9_client_open(fid, omode); | |
9523a841 | 79 | if (err < 0) { |
bd238fb4 LI |
80 | p9_client_clunk(fid); |
81 | return err; | |
82 | } | |
ef56547e | 83 | if (file->f_flags & O_TRUNC) { |
7549ae3e | 84 | i_size_write(inode, 0); |
9523a841 EVH |
85 | inode->i_blocks = 0; |
86 | } | |
ef56547e MK |
87 | if ((file->f_flags & O_APPEND) && |
88 | (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))) | |
2e4bef41 | 89 | generic_file_llseek(file, 0, SEEK_END); |
6a3124a3 | 90 | } |
e69e7fe5 | 91 | |
bd238fb4 | 92 | file->private_data = fid; |
5a7e0a8c | 93 | mutex_lock(&v9inode->v_mutex); |
7add697a AK |
94 | if (v9ses->cache && !v9inode->writeback_fid && |
95 | ((file->f_flags & O_ACCMODE) != O_RDONLY)) { | |
3cf387d7 | 96 | /* |
6b39f6d2 | 97 | * clone a fid and add it to writeback_fid |
3cf387d7 AK |
98 | * we do it during open time instead of |
99 | * page dirty time via write_begin/page_mkwrite | |
100 | * because we want write after unlink usecase | |
101 | * to work. | |
102 | */ | |
103 | fid = v9fs_writeback_fid(file->f_path.dentry); | |
104 | if (IS_ERR(fid)) { | |
105 | err = PTR_ERR(fid); | |
5a7e0a8c | 106 | mutex_unlock(&v9inode->v_mutex); |
3cf387d7 AK |
107 | goto out_error; |
108 | } | |
6b39f6d2 | 109 | v9inode->writeback_fid = (void *) fid; |
3cf387d7 | 110 | } |
5a7e0a8c | 111 | mutex_unlock(&v9inode->v_mutex); |
29236f4e | 112 | #ifdef CONFIG_9P_FSCACHE |
46848de0 | 113 | if (v9ses->cache) |
60e78d2c | 114 | v9fs_cache_inode_set_cookie(inode, file); |
29236f4e | 115 | #endif |
6a3124a3 | 116 | return 0; |
3cf387d7 AK |
117 | out_error: |
118 | p9_client_clunk(file->private_data); | |
119 | file->private_data = NULL; | |
120 | return err; | |
e69e7fe5 EVH |
121 | } |
122 | ||
123 | /** | |
124 | * v9fs_file_lock - lock a file (or directory) | |
ee443996 EVH |
125 | * @filp: file to be locked |
126 | * @cmd: lock command | |
127 | * @fl: file lock structure | |
e69e7fe5 | 128 | * |
ee443996 | 129 | * Bugs: this looks like a local only lock, we should extend into 9P |
e69e7fe5 EVH |
130 | * by using open exclusive |
131 | */ | |
132 | ||
133 | static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) | |
134 | { | |
135 | int res = 0; | |
d6f787bc | 136 | struct inode *inode = filp->f_path.dentry->d_inode; |
e69e7fe5 | 137 | |
bd238fb4 | 138 | P9_DPRINTK(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); |
e69e7fe5 EVH |
139 | |
140 | /* No mandatory locks */ | |
f78233dd | 141 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
e69e7fe5 EVH |
142 | return -ENOLCK; |
143 | ||
144 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
28fd1298 | 145 | filemap_write_and_wait(inode->i_mapping); |
fc0ecff6 | 146 | invalidate_mapping_pages(&inode->i_data, 0, -1); |
e69e7fe5 EVH |
147 | } |
148 | ||
149 | return res; | |
150 | } | |
151 | ||
a099027c MK |
152 | static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl) |
153 | { | |
154 | struct p9_flock flock; | |
155 | struct p9_fid *fid; | |
156 | uint8_t status; | |
157 | int res = 0; | |
158 | unsigned char fl_type; | |
159 | ||
160 | fid = filp->private_data; | |
161 | BUG_ON(fid == NULL); | |
162 | ||
163 | if ((fl->fl_flags & FL_POSIX) != FL_POSIX) | |
164 | BUG(); | |
165 | ||
166 | res = posix_lock_file_wait(filp, fl); | |
167 | if (res < 0) | |
168 | goto out; | |
169 | ||
170 | /* convert posix lock to p9 tlock args */ | |
171 | memset(&flock, 0, sizeof(flock)); | |
51b8b4fb JG |
172 | /* map the lock type */ |
173 | switch (fl->fl_type) { | |
174 | case F_RDLCK: | |
175 | flock.type = P9_LOCK_TYPE_RDLCK; | |
176 | break; | |
177 | case F_WRLCK: | |
178 | flock.type = P9_LOCK_TYPE_WRLCK; | |
179 | break; | |
180 | case F_UNLCK: | |
181 | flock.type = P9_LOCK_TYPE_UNLCK; | |
182 | break; | |
183 | } | |
a099027c MK |
184 | flock.start = fl->fl_start; |
185 | if (fl->fl_end == OFFSET_MAX) | |
186 | flock.length = 0; | |
187 | else | |
188 | flock.length = fl->fl_end - fl->fl_start + 1; | |
189 | flock.proc_id = fl->fl_pid; | |
190 | flock.client_id = utsname()->nodename; | |
191 | if (IS_SETLKW(cmd)) | |
192 | flock.flags = P9_LOCK_FLAGS_BLOCK; | |
193 | ||
194 | /* | |
195 | * if its a blocked request and we get P9_LOCK_BLOCKED as the status | |
196 | * for lock request, keep on trying | |
197 | */ | |
198 | for (;;) { | |
199 | res = p9_client_lock_dotl(fid, &flock, &status); | |
200 | if (res < 0) | |
201 | break; | |
202 | ||
203 | if (status != P9_LOCK_BLOCKED) | |
204 | break; | |
205 | if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd)) | |
206 | break; | |
207 | schedule_timeout_interruptible(P9_LOCK_TIMEOUT); | |
208 | } | |
209 | ||
210 | /* map 9p status to VFS status */ | |
211 | switch (status) { | |
212 | case P9_LOCK_SUCCESS: | |
213 | res = 0; | |
214 | break; | |
215 | case P9_LOCK_BLOCKED: | |
216 | res = -EAGAIN; | |
217 | break; | |
218 | case P9_LOCK_ERROR: | |
219 | case P9_LOCK_GRACE: | |
220 | res = -ENOLCK; | |
221 | break; | |
222 | default: | |
223 | BUG(); | |
224 | } | |
225 | ||
226 | /* | |
227 | * incase server returned error for lock request, revert | |
228 | * it locally | |
229 | */ | |
230 | if (res < 0 && fl->fl_type != F_UNLCK) { | |
231 | fl_type = fl->fl_type; | |
232 | fl->fl_type = F_UNLCK; | |
233 | res = posix_lock_file_wait(filp, fl); | |
234 | fl->fl_type = fl_type; | |
235 | } | |
236 | out: | |
237 | return res; | |
238 | } | |
239 | ||
1d769cd1 MK |
240 | static int v9fs_file_getlock(struct file *filp, struct file_lock *fl) |
241 | { | |
242 | struct p9_getlock glock; | |
243 | struct p9_fid *fid; | |
244 | int res = 0; | |
245 | ||
246 | fid = filp->private_data; | |
247 | BUG_ON(fid == NULL); | |
248 | ||
249 | posix_test_lock(filp, fl); | |
250 | /* | |
251 | * if we have a conflicting lock locally, no need to validate | |
252 | * with server | |
253 | */ | |
254 | if (fl->fl_type != F_UNLCK) | |
255 | return res; | |
256 | ||
257 | /* convert posix lock to p9 tgetlock args */ | |
258 | memset(&glock, 0, sizeof(glock)); | |
51b8b4fb | 259 | glock.type = P9_LOCK_TYPE_UNLCK; |
1d769cd1 MK |
260 | glock.start = fl->fl_start; |
261 | if (fl->fl_end == OFFSET_MAX) | |
262 | glock.length = 0; | |
263 | else | |
264 | glock.length = fl->fl_end - fl->fl_start + 1; | |
265 | glock.proc_id = fl->fl_pid; | |
266 | glock.client_id = utsname()->nodename; | |
267 | ||
268 | res = p9_client_getlock_dotl(fid, &glock); | |
269 | if (res < 0) | |
270 | return res; | |
51b8b4fb JG |
271 | /* map 9p lock type to os lock type */ |
272 | switch (glock.type) { | |
273 | case P9_LOCK_TYPE_RDLCK: | |
274 | fl->fl_type = F_RDLCK; | |
275 | break; | |
276 | case P9_LOCK_TYPE_WRLCK: | |
277 | fl->fl_type = F_WRLCK; | |
278 | break; | |
279 | case P9_LOCK_TYPE_UNLCK: | |
280 | fl->fl_type = F_UNLCK; | |
281 | break; | |
282 | } | |
283 | if (glock.type != P9_LOCK_TYPE_UNLCK) { | |
1d769cd1 MK |
284 | fl->fl_start = glock.start; |
285 | if (glock.length == 0) | |
286 | fl->fl_end = OFFSET_MAX; | |
287 | else | |
288 | fl->fl_end = glock.start + glock.length - 1; | |
289 | fl->fl_pid = glock.proc_id; | |
51b8b4fb | 290 | } |
1d769cd1 MK |
291 | return res; |
292 | } | |
293 | ||
a099027c MK |
294 | /** |
295 | * v9fs_file_lock_dotl - lock a file (or directory) | |
296 | * @filp: file to be locked | |
297 | * @cmd: lock command | |
298 | * @fl: file lock structure | |
299 | * | |
300 | */ | |
301 | ||
302 | static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl) | |
303 | { | |
304 | struct inode *inode = filp->f_path.dentry->d_inode; | |
305 | int ret = -ENOLCK; | |
306 | ||
307 | P9_DPRINTK(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n", filp, | |
308 | cmd, fl, filp->f_path.dentry->d_name.name); | |
309 | ||
310 | /* No mandatory locks */ | |
311 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) | |
312 | goto out_err; | |
313 | ||
314 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
315 | filemap_write_and_wait(inode->i_mapping); | |
316 | invalidate_mapping_pages(&inode->i_data, 0, -1); | |
317 | } | |
318 | ||
319 | if (IS_SETLK(cmd) || IS_SETLKW(cmd)) | |
320 | ret = v9fs_file_do_lock(filp, cmd, fl); | |
1d769cd1 MK |
321 | else if (IS_GETLK(cmd)) |
322 | ret = v9fs_file_getlock(filp, fl); | |
a099027c MK |
323 | else |
324 | ret = -EINVAL; | |
325 | out_err: | |
326 | return ret; | |
327 | } | |
328 | ||
329 | /** | |
330 | * v9fs_file_flock_dotl - lock a file | |
331 | * @filp: file to be locked | |
332 | * @cmd: lock command | |
333 | * @fl: file lock structure | |
334 | * | |
335 | */ | |
336 | ||
337 | static int v9fs_file_flock_dotl(struct file *filp, int cmd, | |
338 | struct file_lock *fl) | |
339 | { | |
340 | struct inode *inode = filp->f_path.dentry->d_inode; | |
341 | int ret = -ENOLCK; | |
342 | ||
343 | P9_DPRINTK(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n", filp, | |
344 | cmd, fl, filp->f_path.dentry->d_name.name); | |
345 | ||
346 | /* No mandatory locks */ | |
347 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) | |
348 | goto out_err; | |
349 | ||
350 | if (!(fl->fl_flags & FL_FLOCK)) | |
351 | goto out_err; | |
352 | ||
353 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
354 | filemap_write_and_wait(inode->i_mapping); | |
355 | invalidate_mapping_pages(&inode->i_data, 0, -1); | |
356 | } | |
357 | /* Convert flock to posix lock */ | |
358 | fl->fl_owner = (fl_owner_t)filp; | |
359 | fl->fl_start = 0; | |
360 | fl->fl_end = OFFSET_MAX; | |
361 | fl->fl_flags |= FL_POSIX; | |
362 | fl->fl_flags ^= FL_FLOCK; | |
363 | ||
364 | if (IS_SETLK(cmd) | IS_SETLKW(cmd)) | |
365 | ret = v9fs_file_do_lock(filp, cmd, fl); | |
366 | else | |
367 | ret = -EINVAL; | |
368 | out_err: | |
369 | return ret; | |
370 | } | |
371 | ||
e69e7fe5 | 372 | /** |
17311779 AK |
373 | * v9fs_fid_readn - read from a fid |
374 | * @fid: fid to read | |
e69e7fe5 | 375 | * @data: data buffer to read data into |
fbedadc1 | 376 | * @udata: user data buffer to read data into |
e69e7fe5 EVH |
377 | * @count: size of buffer |
378 | * @offset: offset at which to read data | |
379 | * | |
380 | */ | |
fbedadc1 | 381 | ssize_t |
17311779 | 382 | v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count, |
fbedadc1 EVH |
383 | u64 offset) |
384 | { | |
97e8442b | 385 | int n, total, size; |
fbedadc1 | 386 | |
51a87c55 | 387 | P9_DPRINTK(P9_DEBUG_VFS, "fid %d offset %llu count %d\n", fid->fid, |
17311779 | 388 | (long long unsigned) offset, count); |
fbedadc1 EVH |
389 | n = 0; |
390 | total = 0; | |
97e8442b | 391 | size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ; |
fbedadc1 EVH |
392 | do { |
393 | n = p9_client_read(fid, data, udata, offset, count); | |
394 | if (n <= 0) | |
395 | break; | |
396 | ||
397 | if (data) | |
398 | data += n; | |
399 | if (udata) | |
400 | udata += n; | |
401 | ||
402 | offset += n; | |
403 | count -= n; | |
404 | total += n; | |
97e8442b | 405 | } while (count > 0 && n == size); |
fbedadc1 EVH |
406 | |
407 | if (n < 0) | |
408 | total = n; | |
409 | ||
410 | return total; | |
411 | } | |
412 | ||
17311779 AK |
413 | /** |
414 | * v9fs_file_readn - read from a file | |
415 | * @filp: file pointer to read | |
416 | * @data: data buffer to read data into | |
417 | * @udata: user data buffer to read data into | |
418 | * @count: size of buffer | |
419 | * @offset: offset at which to read data | |
420 | * | |
421 | */ | |
422 | ssize_t | |
423 | v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count, | |
424 | u64 offset) | |
425 | { | |
426 | return v9fs_fid_readn(filp->private_data, data, udata, count, offset); | |
427 | } | |
428 | ||
fbedadc1 EVH |
429 | /** |
430 | * v9fs_file_read - read from a file | |
431 | * @filp: file pointer to read | |
432 | * @udata: user data buffer to read data into | |
433 | * @count: size of buffer | |
434 | * @offset: offset at which to read data | |
435 | * | |
436 | */ | |
437 | ||
e69e7fe5 | 438 | static ssize_t |
fbedadc1 | 439 | v9fs_file_read(struct file *filp, char __user *udata, size_t count, |
19cba8ab | 440 | loff_t * offset) |
e69e7fe5 | 441 | { |
bd238fb4 LI |
442 | int ret; |
443 | struct p9_fid *fid; | |
97e8442b | 444 | size_t size; |
e69e7fe5 | 445 | |
ea2e7996 | 446 | P9_DPRINTK(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset); |
bd238fb4 | 447 | fid = filp->private_data; |
fbedadc1 | 448 | |
97e8442b MK |
449 | size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ; |
450 | if (count > size) | |
fbedadc1 EVH |
451 | ret = v9fs_file_readn(filp, NULL, udata, count, *offset); |
452 | else | |
453 | ret = p9_client_read(fid, NULL, udata, *offset, count); | |
454 | ||
bd238fb4 LI |
455 | if (ret > 0) |
456 | *offset += ret; | |
e69e7fe5 | 457 | |
bd238fb4 | 458 | return ret; |
e69e7fe5 EVH |
459 | } |
460 | ||
17311779 AK |
461 | ssize_t |
462 | v9fs_file_write_internal(struct inode *inode, struct p9_fid *fid, | |
463 | const char __user *data, size_t count, | |
464 | loff_t *offset, int invalidate) | |
e69e7fe5 | 465 | { |
8d40fa24 | 466 | int n; |
fa6ea161 | 467 | loff_t i_size; |
17311779 | 468 | size_t total = 0; |
dfb0ec2e | 469 | struct p9_client *clnt; |
fc0f2961 | 470 | loff_t origin = *offset; |
637d020a | 471 | unsigned long pg_start, pg_end; |
e69e7fe5 | 472 | |
bd238fb4 LI |
473 | P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data, |
474 | (int)count, (int)*offset); | |
e69e7fe5 | 475 | |
dfb0ec2e | 476 | clnt = fid->clnt; |
dfb0ec2e | 477 | do { |
8d40fa24 | 478 | n = p9_client_write(fid, NULL, data+total, origin+total, count); |
dfb0ec2e EVH |
479 | if (n <= 0) |
480 | break; | |
481 | count -= n; | |
482 | total += n; | |
483 | } while (count > 0); | |
484 | ||
17311779 | 485 | if (invalidate && (total > 0)) { |
637d020a AK |
486 | pg_start = origin >> PAGE_CACHE_SHIFT; |
487 | pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT; | |
60e78d2c AK |
488 | if (inode->i_mapping && inode->i_mapping->nrpages) |
489 | invalidate_inode_pages2_range(inode->i_mapping, | |
490 | pg_start, pg_end); | |
dfb0ec2e | 491 | *offset += total; |
fa6ea161 AK |
492 | i_size = i_size_read(inode); |
493 | if (*offset > i_size) { | |
494 | inode_add_bytes(inode, *offset - i_size); | |
495 | i_size_write(inode, *offset); | |
496 | } | |
9523a841 | 497 | } |
dfb0ec2e | 498 | if (n < 0) |
17311779 AK |
499 | return n; |
500 | ||
501 | return total; | |
502 | } | |
503 | ||
504 | /** | |
505 | * v9fs_file_write - write to a file | |
506 | * @filp: file pointer to write | |
507 | * @data: data buffer to write data from | |
508 | * @count: size of buffer | |
509 | * @offset: offset at which to write data | |
510 | * | |
511 | */ | |
512 | static ssize_t | |
513 | v9fs_file_write(struct file *filp, const char __user * data, | |
514 | size_t count, loff_t *offset) | |
515 | { | |
516 | ssize_t retval = 0; | |
517 | loff_t origin = *offset; | |
518 | ||
519 | ||
520 | retval = generic_write_checks(filp, &origin, &count, 0); | |
521 | if (retval) | |
522 | goto out; | |
523 | ||
524 | retval = -EINVAL; | |
525 | if ((ssize_t) count < 0) | |
526 | goto out; | |
527 | retval = 0; | |
528 | if (!count) | |
529 | goto out; | |
530 | ||
aaf0ef1d | 531 | retval = v9fs_file_write_internal(filp->f_path.dentry->d_inode, |
17311779 | 532 | filp->private_data, |
aaf0ef1d MK |
533 | data, count, &origin, 1); |
534 | /* update offset on successful write */ | |
535 | if (retval > 0) | |
536 | *offset = origin; | |
3834b12a HPB |
537 | out: |
538 | return retval; | |
e69e7fe5 EVH |
539 | } |
540 | ||
7263cebe | 541 | |
02c24a82 JB |
542 | static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end, |
543 | int datasync) | |
7a4439c4 MK |
544 | { |
545 | struct p9_fid *fid; | |
02c24a82 | 546 | struct inode *inode = filp->f_mapping->host; |
7a4439c4 MK |
547 | struct p9_wstat wstat; |
548 | int retval; | |
549 | ||
02c24a82 JB |
550 | retval = filemap_write_and_wait_range(inode->i_mapping, start, end); |
551 | if (retval) | |
552 | return retval; | |
553 | ||
554 | mutex_lock(&inode->i_mutex); | |
7ea80859 | 555 | P9_DPRINTK(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
7a4439c4 MK |
556 | |
557 | fid = filp->private_data; | |
558 | v9fs_blank_wstat(&wstat); | |
559 | ||
560 | retval = p9_client_wstat(fid, &wstat); | |
02c24a82 JB |
561 | mutex_unlock(&inode->i_mutex); |
562 | ||
7a4439c4 MK |
563 | return retval; |
564 | } | |
565 | ||
02c24a82 JB |
566 | int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, |
567 | int datasync) | |
920e65dc VJJ |
568 | { |
569 | struct p9_fid *fid; | |
02c24a82 | 570 | struct inode *inode = filp->f_mapping->host; |
920e65dc VJJ |
571 | int retval; |
572 | ||
02c24a82 JB |
573 | retval = filemap_write_and_wait_range(inode->i_mapping, start, end); |
574 | if (retval) | |
575 | return retval; | |
576 | ||
577 | mutex_lock(&inode->i_mutex); | |
920e65dc VJJ |
578 | P9_DPRINTK(P9_DEBUG_VFS, "v9fs_file_fsync_dotl: filp %p datasync %x\n", |
579 | filp, datasync); | |
580 | ||
581 | fid = filp->private_data; | |
582 | ||
b165d601 | 583 | retval = p9_client_fsync(fid, datasync); |
02c24a82 JB |
584 | mutex_unlock(&inode->i_mutex); |
585 | ||
920e65dc VJJ |
586 | return retval; |
587 | } | |
588 | ||
7263cebe AK |
589 | static int |
590 | v9fs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
591 | { | |
592 | int retval; | |
593 | ||
594 | retval = generic_file_mmap(file, vma); | |
595 | if (!retval) | |
596 | vma->vm_ops = &v9fs_file_vm_ops; | |
597 | ||
598 | return retval; | |
599 | } | |
600 | ||
601 | static int | |
602 | v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
603 | { | |
6b39f6d2 | 604 | struct v9fs_inode *v9inode; |
7263cebe AK |
605 | struct page *page = vmf->page; |
606 | struct file *filp = vma->vm_file; | |
607 | struct inode *inode = filp->f_path.dentry->d_inode; | |
608 | ||
609 | ||
610 | P9_DPRINTK(P9_DEBUG_VFS, "page %p fid %lx\n", | |
611 | page, (unsigned long)filp->private_data); | |
612 | ||
6b39f6d2 | 613 | v9inode = V9FS_I(inode); |
7263cebe AK |
614 | /* make sure the cache has finished storing the page */ |
615 | v9fs_fscache_wait_on_page_write(inode, page); | |
6b39f6d2 | 616 | BUG_ON(!v9inode->writeback_fid); |
7263cebe AK |
617 | lock_page(page); |
618 | if (page->mapping != inode->i_mapping) | |
619 | goto out_unlock; | |
620 | ||
621 | return VM_FAULT_LOCKED; | |
622 | out_unlock: | |
623 | unlock_page(page); | |
624 | return VM_FAULT_NOPAGE; | |
625 | } | |
626 | ||
e959b549 AK |
627 | static ssize_t |
628 | v9fs_direct_read(struct file *filp, char __user *udata, size_t count, | |
629 | loff_t *offsetp) | |
630 | { | |
631 | loff_t size, offset; | |
632 | struct inode *inode; | |
633 | struct address_space *mapping; | |
634 | ||
635 | offset = *offsetp; | |
636 | mapping = filp->f_mapping; | |
637 | inode = mapping->host; | |
638 | if (!count) | |
639 | return 0; | |
640 | size = i_size_read(inode); | |
641 | if (offset < size) | |
642 | filemap_write_and_wait_range(mapping, offset, | |
643 | offset + count - 1); | |
644 | ||
645 | return v9fs_file_read(filp, udata, count, offsetp); | |
646 | } | |
647 | ||
648 | /** | |
649 | * v9fs_cached_file_read - read from a file | |
650 | * @filp: file pointer to read | |
651 | * @udata: user data buffer to read data into | |
652 | * @count: size of buffer | |
653 | * @offset: offset at which to read data | |
654 | * | |
655 | */ | |
656 | static ssize_t | |
657 | v9fs_cached_file_read(struct file *filp, char __user *data, size_t count, | |
658 | loff_t *offset) | |
659 | { | |
660 | if (filp->f_flags & O_DIRECT) | |
661 | return v9fs_direct_read(filp, data, count, offset); | |
662 | return do_sync_read(filp, data, count, offset); | |
663 | } | |
664 | ||
665 | static ssize_t | |
666 | v9fs_direct_write(struct file *filp, const char __user * data, | |
667 | size_t count, loff_t *offsetp) | |
668 | { | |
669 | loff_t offset; | |
670 | ssize_t retval; | |
671 | struct inode *inode; | |
672 | struct address_space *mapping; | |
673 | ||
674 | offset = *offsetp; | |
675 | mapping = filp->f_mapping; | |
676 | inode = mapping->host; | |
677 | if (!count) | |
678 | return 0; | |
679 | ||
680 | mutex_lock(&inode->i_mutex); | |
681 | retval = filemap_write_and_wait_range(mapping, offset, | |
682 | offset + count - 1); | |
683 | if (retval) | |
684 | goto err_out; | |
685 | /* | |
686 | * After a write we want buffered reads to be sure to go to disk to get | |
687 | * the new data. We invalidate clean cached page from the region we're | |
688 | * about to write. We do this *before* the write so that if we fail | |
689 | * here we fall back to buffered write | |
690 | */ | |
691 | if (mapping->nrpages) { | |
692 | pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT; | |
693 | pgoff_t pg_end = (offset + count - 1) >> PAGE_CACHE_SHIFT; | |
694 | ||
695 | retval = invalidate_inode_pages2_range(mapping, | |
696 | pg_start, pg_end); | |
697 | /* | |
698 | * If a page can not be invalidated, fall back | |
699 | * to buffered write. | |
700 | */ | |
701 | if (retval) { | |
702 | if (retval == -EBUSY) | |
703 | goto buff_write; | |
704 | goto err_out; | |
705 | } | |
706 | } | |
707 | retval = v9fs_file_write(filp, data, count, offsetp); | |
708 | err_out: | |
709 | mutex_unlock(&inode->i_mutex); | |
710 | return retval; | |
711 | ||
712 | buff_write: | |
713 | mutex_unlock(&inode->i_mutex); | |
714 | return do_sync_write(filp, data, count, offsetp); | |
715 | } | |
716 | ||
717 | /** | |
718 | * v9fs_cached_file_write - write to a file | |
719 | * @filp: file pointer to write | |
720 | * @data: data buffer to write data from | |
721 | * @count: size of buffer | |
722 | * @offset: offset at which to write data | |
723 | * | |
724 | */ | |
725 | static ssize_t | |
726 | v9fs_cached_file_write(struct file *filp, const char __user * data, | |
727 | size_t count, loff_t *offset) | |
728 | { | |
729 | ||
730 | if (filp->f_flags & O_DIRECT) | |
731 | return v9fs_direct_write(filp, data, count, offset); | |
732 | return do_sync_write(filp, data, count, offset); | |
733 | } | |
734 | ||
7263cebe AK |
735 | static const struct vm_operations_struct v9fs_file_vm_ops = { |
736 | .fault = filemap_fault, | |
737 | .page_mkwrite = v9fs_vm_page_mkwrite, | |
738 | }; | |
739 | ||
e959b549 | 740 | |
29236f4e | 741 | const struct file_operations v9fs_cached_file_operations = { |
e03abc0c | 742 | .llseek = generic_file_llseek, |
e959b549 AK |
743 | .read = v9fs_cached_file_read, |
744 | .write = v9fs_cached_file_write, | |
e03abc0c | 745 | .aio_read = generic_file_aio_read, |
7263cebe | 746 | .aio_write = generic_file_aio_write, |
e03abc0c EVH |
747 | .open = v9fs_file_open, |
748 | .release = v9fs_dir_release, | |
749 | .lock = v9fs_file_lock, | |
7263cebe | 750 | .mmap = v9fs_file_mmap, |
7a4439c4 | 751 | .fsync = v9fs_file_fsync, |
e03abc0c EVH |
752 | }; |
753 | ||
29236f4e | 754 | const struct file_operations v9fs_cached_file_operations_dotl = { |
b04faaf3 | 755 | .llseek = generic_file_llseek, |
e959b549 AK |
756 | .read = v9fs_cached_file_read, |
757 | .write = v9fs_cached_file_write, | |
b04faaf3 | 758 | .aio_read = generic_file_aio_read, |
7263cebe | 759 | .aio_write = generic_file_aio_write, |
b04faaf3 VJJ |
760 | .open = v9fs_file_open, |
761 | .release = v9fs_dir_release, | |
a099027c MK |
762 | .lock = v9fs_file_lock_dotl, |
763 | .flock = v9fs_file_flock_dotl, | |
7263cebe | 764 | .mmap = v9fs_file_mmap, |
920e65dc | 765 | .fsync = v9fs_file_fsync_dotl, |
b04faaf3 VJJ |
766 | }; |
767 | ||
4b6f5d20 | 768 | const struct file_operations v9fs_file_operations = { |
e69e7fe5 EVH |
769 | .llseek = generic_file_llseek, |
770 | .read = v9fs_file_read, | |
771 | .write = v9fs_file_write, | |
772 | .open = v9fs_file_open, | |
773 | .release = v9fs_dir_release, | |
774 | .lock = v9fs_file_lock, | |
14b8869f | 775 | .mmap = generic_file_readonly_mmap, |
7a4439c4 | 776 | .fsync = v9fs_file_fsync, |
e69e7fe5 | 777 | }; |
9b6533c9 SK |
778 | |
779 | const struct file_operations v9fs_file_operations_dotl = { | |
780 | .llseek = generic_file_llseek, | |
781 | .read = v9fs_file_read, | |
782 | .write = v9fs_file_write, | |
783 | .open = v9fs_file_open, | |
784 | .release = v9fs_dir_release, | |
a099027c MK |
785 | .lock = v9fs_file_lock_dotl, |
786 | .flock = v9fs_file_flock_dotl, | |
9b6533c9 | 787 | .mmap = generic_file_readonly_mmap, |
920e65dc | 788 | .fsync = v9fs_file_fsync_dotl, |
9b6533c9 | 789 | }; |