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Commit | Line | Data |
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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 | |
5d385153 | 64 | p9_debug(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 MK |
83 | if ((file->f_flags & O_APPEND) && |
84 | (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))) | |
2e4bef41 | 85 | generic_file_llseek(file, 0, SEEK_END); |
6a3124a3 | 86 | } |
e69e7fe5 | 87 | |
bd238fb4 | 88 | file->private_data = fid; |
5a7e0a8c | 89 | mutex_lock(&v9inode->v_mutex); |
7add697a AK |
90 | if (v9ses->cache && !v9inode->writeback_fid && |
91 | ((file->f_flags & O_ACCMODE) != O_RDONLY)) { | |
3cf387d7 | 92 | /* |
6b39f6d2 | 93 | * clone a fid and add it to writeback_fid |
3cf387d7 AK |
94 | * we do it during open time instead of |
95 | * page dirty time via write_begin/page_mkwrite | |
96 | * because we want write after unlink usecase | |
97 | * to work. | |
98 | */ | |
99 | fid = v9fs_writeback_fid(file->f_path.dentry); | |
100 | if (IS_ERR(fid)) { | |
101 | err = PTR_ERR(fid); | |
5a7e0a8c | 102 | mutex_unlock(&v9inode->v_mutex); |
3cf387d7 AK |
103 | goto out_error; |
104 | } | |
6b39f6d2 | 105 | v9inode->writeback_fid = (void *) fid; |
3cf387d7 | 106 | } |
5a7e0a8c | 107 | mutex_unlock(&v9inode->v_mutex); |
46848de0 | 108 | if (v9ses->cache) |
60e78d2c | 109 | v9fs_cache_inode_set_cookie(inode, file); |
6a3124a3 | 110 | return 0; |
3cf387d7 AK |
111 | out_error: |
112 | p9_client_clunk(file->private_data); | |
113 | file->private_data = NULL; | |
114 | return err; | |
e69e7fe5 EVH |
115 | } |
116 | ||
117 | /** | |
118 | * v9fs_file_lock - lock a file (or directory) | |
ee443996 EVH |
119 | * @filp: file to be locked |
120 | * @cmd: lock command | |
121 | * @fl: file lock structure | |
e69e7fe5 | 122 | * |
ee443996 | 123 | * Bugs: this looks like a local only lock, we should extend into 9P |
e69e7fe5 EVH |
124 | * by using open exclusive |
125 | */ | |
126 | ||
127 | static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) | |
128 | { | |
129 | int res = 0; | |
496ad9aa | 130 | struct inode *inode = file_inode(filp); |
e69e7fe5 | 131 | |
5d385153 | 132 | p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); |
e69e7fe5 EVH |
133 | |
134 | /* No mandatory locks */ | |
f78233dd | 135 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
e69e7fe5 EVH |
136 | return -ENOLCK; |
137 | ||
138 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
28fd1298 | 139 | filemap_write_and_wait(inode->i_mapping); |
fc0ecff6 | 140 | invalidate_mapping_pages(&inode->i_data, 0, -1); |
e69e7fe5 EVH |
141 | } |
142 | ||
143 | return res; | |
144 | } | |
145 | ||
a099027c MK |
146 | static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl) |
147 | { | |
148 | struct p9_flock flock; | |
149 | struct p9_fid *fid; | |
150 | uint8_t status; | |
151 | int res = 0; | |
152 | unsigned char fl_type; | |
153 | ||
154 | fid = filp->private_data; | |
155 | BUG_ON(fid == NULL); | |
156 | ||
157 | if ((fl->fl_flags & FL_POSIX) != FL_POSIX) | |
158 | BUG(); | |
159 | ||
160 | res = posix_lock_file_wait(filp, fl); | |
161 | if (res < 0) | |
162 | goto out; | |
163 | ||
164 | /* convert posix lock to p9 tlock args */ | |
165 | memset(&flock, 0, sizeof(flock)); | |
51b8b4fb JG |
166 | /* map the lock type */ |
167 | switch (fl->fl_type) { | |
168 | case F_RDLCK: | |
169 | flock.type = P9_LOCK_TYPE_RDLCK; | |
170 | break; | |
171 | case F_WRLCK: | |
172 | flock.type = P9_LOCK_TYPE_WRLCK; | |
173 | break; | |
174 | case F_UNLCK: | |
175 | flock.type = P9_LOCK_TYPE_UNLCK; | |
176 | break; | |
177 | } | |
a099027c MK |
178 | flock.start = fl->fl_start; |
179 | if (fl->fl_end == OFFSET_MAX) | |
180 | flock.length = 0; | |
181 | else | |
182 | flock.length = fl->fl_end - fl->fl_start + 1; | |
183 | flock.proc_id = fl->fl_pid; | |
50192abe | 184 | flock.client_id = fid->clnt->name; |
a099027c MK |
185 | if (IS_SETLKW(cmd)) |
186 | flock.flags = P9_LOCK_FLAGS_BLOCK; | |
187 | ||
188 | /* | |
189 | * if its a blocked request and we get P9_LOCK_BLOCKED as the status | |
190 | * for lock request, keep on trying | |
191 | */ | |
192 | for (;;) { | |
193 | res = p9_client_lock_dotl(fid, &flock, &status); | |
194 | if (res < 0) | |
195 | break; | |
196 | ||
197 | if (status != P9_LOCK_BLOCKED) | |
198 | break; | |
199 | if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd)) | |
200 | break; | |
a0ea787b JG |
201 | if (schedule_timeout_interruptible(P9_LOCK_TIMEOUT) != 0) |
202 | break; | |
a099027c MK |
203 | } |
204 | ||
205 | /* map 9p status to VFS status */ | |
206 | switch (status) { | |
207 | case P9_LOCK_SUCCESS: | |
208 | res = 0; | |
209 | break; | |
210 | case P9_LOCK_BLOCKED: | |
211 | res = -EAGAIN; | |
212 | break; | |
213 | case P9_LOCK_ERROR: | |
214 | case P9_LOCK_GRACE: | |
215 | res = -ENOLCK; | |
216 | break; | |
217 | default: | |
218 | BUG(); | |
219 | } | |
220 | ||
221 | /* | |
222 | * incase server returned error for lock request, revert | |
223 | * it locally | |
224 | */ | |
225 | if (res < 0 && fl->fl_type != F_UNLCK) { | |
226 | fl_type = fl->fl_type; | |
227 | fl->fl_type = F_UNLCK; | |
228 | res = posix_lock_file_wait(filp, fl); | |
229 | fl->fl_type = fl_type; | |
230 | } | |
231 | out: | |
232 | return res; | |
233 | } | |
234 | ||
1d769cd1 MK |
235 | static int v9fs_file_getlock(struct file *filp, struct file_lock *fl) |
236 | { | |
237 | struct p9_getlock glock; | |
238 | struct p9_fid *fid; | |
239 | int res = 0; | |
240 | ||
241 | fid = filp->private_data; | |
242 | BUG_ON(fid == NULL); | |
243 | ||
244 | posix_test_lock(filp, fl); | |
245 | /* | |
246 | * if we have a conflicting lock locally, no need to validate | |
247 | * with server | |
248 | */ | |
249 | if (fl->fl_type != F_UNLCK) | |
250 | return res; | |
251 | ||
252 | /* convert posix lock to p9 tgetlock args */ | |
253 | memset(&glock, 0, sizeof(glock)); | |
51b8b4fb | 254 | glock.type = P9_LOCK_TYPE_UNLCK; |
1d769cd1 MK |
255 | glock.start = fl->fl_start; |
256 | if (fl->fl_end == OFFSET_MAX) | |
257 | glock.length = 0; | |
258 | else | |
259 | glock.length = fl->fl_end - fl->fl_start + 1; | |
260 | glock.proc_id = fl->fl_pid; | |
50192abe | 261 | glock.client_id = fid->clnt->name; |
1d769cd1 MK |
262 | |
263 | res = p9_client_getlock_dotl(fid, &glock); | |
264 | if (res < 0) | |
265 | return res; | |
51b8b4fb JG |
266 | /* map 9p lock type to os lock type */ |
267 | switch (glock.type) { | |
268 | case P9_LOCK_TYPE_RDLCK: | |
269 | fl->fl_type = F_RDLCK; | |
270 | break; | |
271 | case P9_LOCK_TYPE_WRLCK: | |
272 | fl->fl_type = F_WRLCK; | |
273 | break; | |
274 | case P9_LOCK_TYPE_UNLCK: | |
275 | fl->fl_type = F_UNLCK; | |
276 | break; | |
277 | } | |
278 | if (glock.type != P9_LOCK_TYPE_UNLCK) { | |
1d769cd1 MK |
279 | fl->fl_start = glock.start; |
280 | if (glock.length == 0) | |
281 | fl->fl_end = OFFSET_MAX; | |
282 | else | |
283 | fl->fl_end = glock.start + glock.length - 1; | |
284 | fl->fl_pid = glock.proc_id; | |
51b8b4fb | 285 | } |
1d769cd1 MK |
286 | return res; |
287 | } | |
288 | ||
a099027c MK |
289 | /** |
290 | * v9fs_file_lock_dotl - lock a file (or directory) | |
291 | * @filp: file to be locked | |
292 | * @cmd: lock command | |
293 | * @fl: file lock structure | |
294 | * | |
295 | */ | |
296 | ||
297 | static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl) | |
298 | { | |
496ad9aa | 299 | struct inode *inode = file_inode(filp); |
a099027c MK |
300 | int ret = -ENOLCK; |
301 | ||
5d385153 JP |
302 | p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n", |
303 | filp, cmd, fl, filp->f_path.dentry->d_name.name); | |
a099027c MK |
304 | |
305 | /* No mandatory locks */ | |
306 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) | |
307 | goto out_err; | |
308 | ||
309 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
310 | filemap_write_and_wait(inode->i_mapping); | |
311 | invalidate_mapping_pages(&inode->i_data, 0, -1); | |
312 | } | |
313 | ||
314 | if (IS_SETLK(cmd) || IS_SETLKW(cmd)) | |
315 | ret = v9fs_file_do_lock(filp, cmd, fl); | |
1d769cd1 MK |
316 | else if (IS_GETLK(cmd)) |
317 | ret = v9fs_file_getlock(filp, fl); | |
a099027c MK |
318 | else |
319 | ret = -EINVAL; | |
320 | out_err: | |
321 | return ret; | |
322 | } | |
323 | ||
324 | /** | |
325 | * v9fs_file_flock_dotl - lock a file | |
326 | * @filp: file to be locked | |
327 | * @cmd: lock command | |
328 | * @fl: file lock structure | |
329 | * | |
330 | */ | |
331 | ||
332 | static int v9fs_file_flock_dotl(struct file *filp, int cmd, | |
333 | struct file_lock *fl) | |
334 | { | |
496ad9aa | 335 | struct inode *inode = file_inode(filp); |
a099027c MK |
336 | int ret = -ENOLCK; |
337 | ||
5d385153 JP |
338 | p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n", |
339 | filp, cmd, fl, filp->f_path.dentry->d_name.name); | |
a099027c MK |
340 | |
341 | /* No mandatory locks */ | |
342 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) | |
343 | goto out_err; | |
344 | ||
345 | if (!(fl->fl_flags & FL_FLOCK)) | |
346 | goto out_err; | |
347 | ||
348 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
349 | filemap_write_and_wait(inode->i_mapping); | |
350 | invalidate_mapping_pages(&inode->i_data, 0, -1); | |
351 | } | |
352 | /* Convert flock to posix lock */ | |
353 | fl->fl_owner = (fl_owner_t)filp; | |
354 | fl->fl_start = 0; | |
355 | fl->fl_end = OFFSET_MAX; | |
356 | fl->fl_flags |= FL_POSIX; | |
357 | fl->fl_flags ^= FL_FLOCK; | |
358 | ||
359 | if (IS_SETLK(cmd) | IS_SETLKW(cmd)) | |
360 | ret = v9fs_file_do_lock(filp, cmd, fl); | |
361 | else | |
362 | ret = -EINVAL; | |
363 | out_err: | |
364 | return ret; | |
365 | } | |
366 | ||
e69e7fe5 | 367 | /** |
17311779 AK |
368 | * v9fs_fid_readn - read from a fid |
369 | * @fid: fid to read | |
e69e7fe5 | 370 | * @data: data buffer to read data into |
fbedadc1 | 371 | * @udata: user data buffer to read data into |
e69e7fe5 EVH |
372 | * @count: size of buffer |
373 | * @offset: offset at which to read data | |
374 | * | |
375 | */ | |
fbedadc1 | 376 | ssize_t |
17311779 | 377 | v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count, |
fbedadc1 EVH |
378 | u64 offset) |
379 | { | |
97e8442b | 380 | int n, total, size; |
fbedadc1 | 381 | |
5d385153 JP |
382 | p9_debug(P9_DEBUG_VFS, "fid %d offset %llu count %d\n", |
383 | fid->fid, (long long unsigned)offset, count); | |
fbedadc1 EVH |
384 | n = 0; |
385 | total = 0; | |
97e8442b | 386 | size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ; |
fbedadc1 EVH |
387 | do { |
388 | n = p9_client_read(fid, data, udata, offset, count); | |
389 | if (n <= 0) | |
390 | break; | |
391 | ||
392 | if (data) | |
393 | data += n; | |
394 | if (udata) | |
395 | udata += n; | |
396 | ||
397 | offset += n; | |
398 | count -= n; | |
399 | total += n; | |
97e8442b | 400 | } while (count > 0 && n == size); |
fbedadc1 EVH |
401 | |
402 | if (n < 0) | |
403 | total = n; | |
404 | ||
405 | return total; | |
406 | } | |
407 | ||
17311779 AK |
408 | /** |
409 | * v9fs_file_readn - read from a file | |
410 | * @filp: file pointer to read | |
411 | * @data: data buffer to read data into | |
412 | * @udata: user data buffer to read data into | |
413 | * @count: size of buffer | |
414 | * @offset: offset at which to read data | |
415 | * | |
416 | */ | |
417 | ssize_t | |
418 | v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count, | |
419 | u64 offset) | |
420 | { | |
421 | return v9fs_fid_readn(filp->private_data, data, udata, count, offset); | |
422 | } | |
423 | ||
fbedadc1 EVH |
424 | /** |
425 | * v9fs_file_read - read from a file | |
426 | * @filp: file pointer to read | |
427 | * @udata: user data buffer to read data into | |
428 | * @count: size of buffer | |
429 | * @offset: offset at which to read data | |
430 | * | |
431 | */ | |
432 | ||
e69e7fe5 | 433 | static ssize_t |
fbedadc1 | 434 | v9fs_file_read(struct file *filp, char __user *udata, size_t count, |
19cba8ab | 435 | loff_t * offset) |
e69e7fe5 | 436 | { |
bd238fb4 LI |
437 | int ret; |
438 | struct p9_fid *fid; | |
97e8442b | 439 | size_t size; |
e69e7fe5 | 440 | |
5d385153 | 441 | p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset); |
bd238fb4 | 442 | fid = filp->private_data; |
fbedadc1 | 443 | |
97e8442b MK |
444 | size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ; |
445 | if (count > size) | |
fbedadc1 EVH |
446 | ret = v9fs_file_readn(filp, NULL, udata, count, *offset); |
447 | else | |
448 | ret = p9_client_read(fid, NULL, udata, *offset, count); | |
449 | ||
bd238fb4 LI |
450 | if (ret > 0) |
451 | *offset += ret; | |
e69e7fe5 | 452 | |
bd238fb4 | 453 | return ret; |
e69e7fe5 EVH |
454 | } |
455 | ||
17311779 AK |
456 | ssize_t |
457 | v9fs_file_write_internal(struct inode *inode, struct p9_fid *fid, | |
458 | const char __user *data, size_t count, | |
459 | loff_t *offset, int invalidate) | |
e69e7fe5 | 460 | { |
8d40fa24 | 461 | int n; |
fa6ea161 | 462 | loff_t i_size; |
17311779 | 463 | size_t total = 0; |
dfb0ec2e | 464 | struct p9_client *clnt; |
fc0f2961 | 465 | loff_t origin = *offset; |
637d020a | 466 | unsigned long pg_start, pg_end; |
e69e7fe5 | 467 | |
5d385153 JP |
468 | p9_debug(P9_DEBUG_VFS, "data %p count %d offset %x\n", |
469 | data, (int)count, (int)*offset); | |
e69e7fe5 | 470 | |
dfb0ec2e | 471 | clnt = fid->clnt; |
dfb0ec2e | 472 | do { |
8d40fa24 | 473 | n = p9_client_write(fid, NULL, data+total, origin+total, count); |
dfb0ec2e EVH |
474 | if (n <= 0) |
475 | break; | |
476 | count -= n; | |
477 | total += n; | |
478 | } while (count > 0); | |
479 | ||
17311779 | 480 | if (invalidate && (total > 0)) { |
637d020a AK |
481 | pg_start = origin >> PAGE_CACHE_SHIFT; |
482 | pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT; | |
60e78d2c AK |
483 | if (inode->i_mapping && inode->i_mapping->nrpages) |
484 | invalidate_inode_pages2_range(inode->i_mapping, | |
485 | pg_start, pg_end); | |
dfb0ec2e | 486 | *offset += total; |
fa6ea161 AK |
487 | i_size = i_size_read(inode); |
488 | if (*offset > i_size) { | |
489 | inode_add_bytes(inode, *offset - i_size); | |
490 | i_size_write(inode, *offset); | |
491 | } | |
9523a841 | 492 | } |
dfb0ec2e | 493 | if (n < 0) |
17311779 AK |
494 | return n; |
495 | ||
496 | return total; | |
497 | } | |
498 | ||
499 | /** | |
500 | * v9fs_file_write - write to a file | |
501 | * @filp: file pointer to write | |
502 | * @data: data buffer to write data from | |
503 | * @count: size of buffer | |
504 | * @offset: offset at which to write data | |
505 | * | |
506 | */ | |
507 | static ssize_t | |
508 | v9fs_file_write(struct file *filp, const char __user * data, | |
509 | size_t count, loff_t *offset) | |
510 | { | |
511 | ssize_t retval = 0; | |
512 | loff_t origin = *offset; | |
513 | ||
514 | ||
515 | retval = generic_write_checks(filp, &origin, &count, 0); | |
516 | if (retval) | |
517 | goto out; | |
518 | ||
519 | retval = -EINVAL; | |
520 | if ((ssize_t) count < 0) | |
521 | goto out; | |
522 | retval = 0; | |
523 | if (!count) | |
524 | goto out; | |
525 | ||
496ad9aa | 526 | retval = v9fs_file_write_internal(file_inode(filp), |
17311779 | 527 | filp->private_data, |
aaf0ef1d MK |
528 | data, count, &origin, 1); |
529 | /* update offset on successful write */ | |
530 | if (retval > 0) | |
531 | *offset = origin; | |
3834b12a HPB |
532 | out: |
533 | return retval; | |
e69e7fe5 EVH |
534 | } |
535 | ||
7263cebe | 536 | |
02c24a82 JB |
537 | static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end, |
538 | int datasync) | |
7a4439c4 MK |
539 | { |
540 | struct p9_fid *fid; | |
02c24a82 | 541 | struct inode *inode = filp->f_mapping->host; |
7a4439c4 MK |
542 | struct p9_wstat wstat; |
543 | int retval; | |
544 | ||
02c24a82 JB |
545 | retval = filemap_write_and_wait_range(inode->i_mapping, start, end); |
546 | if (retval) | |
547 | return retval; | |
548 | ||
549 | mutex_lock(&inode->i_mutex); | |
5d385153 | 550 | p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
7a4439c4 MK |
551 | |
552 | fid = filp->private_data; | |
553 | v9fs_blank_wstat(&wstat); | |
554 | ||
555 | retval = p9_client_wstat(fid, &wstat); | |
02c24a82 JB |
556 | mutex_unlock(&inode->i_mutex); |
557 | ||
7a4439c4 MK |
558 | return retval; |
559 | } | |
560 | ||
02c24a82 JB |
561 | int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, |
562 | int datasync) | |
920e65dc VJJ |
563 | { |
564 | struct p9_fid *fid; | |
02c24a82 | 565 | struct inode *inode = filp->f_mapping->host; |
920e65dc VJJ |
566 | int retval; |
567 | ||
02c24a82 JB |
568 | retval = filemap_write_and_wait_range(inode->i_mapping, start, end); |
569 | if (retval) | |
570 | return retval; | |
571 | ||
572 | mutex_lock(&inode->i_mutex); | |
5d385153 | 573 | p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
920e65dc VJJ |
574 | |
575 | fid = filp->private_data; | |
576 | ||
b165d601 | 577 | retval = p9_client_fsync(fid, datasync); |
02c24a82 JB |
578 | mutex_unlock(&inode->i_mutex); |
579 | ||
920e65dc VJJ |
580 | return retval; |
581 | } | |
582 | ||
7263cebe AK |
583 | static int |
584 | v9fs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
585 | { | |
586 | int retval; | |
587 | ||
588 | retval = generic_file_mmap(file, vma); | |
589 | if (!retval) | |
590 | vma->vm_ops = &v9fs_file_vm_ops; | |
591 | ||
592 | return retval; | |
593 | } | |
594 | ||
595 | static int | |
596 | v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
597 | { | |
6b39f6d2 | 598 | struct v9fs_inode *v9inode; |
7263cebe AK |
599 | struct page *page = vmf->page; |
600 | struct file *filp = vma->vm_file; | |
496ad9aa | 601 | struct inode *inode = file_inode(filp); |
7263cebe AK |
602 | |
603 | ||
5d385153 JP |
604 | p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n", |
605 | page, (unsigned long)filp->private_data); | |
7263cebe | 606 | |
120c2bca JK |
607 | /* Update file times before taking page lock */ |
608 | file_update_time(filp); | |
609 | ||
6b39f6d2 | 610 | v9inode = V9FS_I(inode); |
7263cebe AK |
611 | /* make sure the cache has finished storing the page */ |
612 | v9fs_fscache_wait_on_page_write(inode, page); | |
6b39f6d2 | 613 | BUG_ON(!v9inode->writeback_fid); |
7263cebe AK |
614 | lock_page(page); |
615 | if (page->mapping != inode->i_mapping) | |
616 | goto out_unlock; | |
13575ca1 | 617 | wait_for_stable_page(page); |
7263cebe AK |
618 | |
619 | return VM_FAULT_LOCKED; | |
620 | out_unlock: | |
621 | unlock_page(page); | |
622 | return VM_FAULT_NOPAGE; | |
623 | } | |
624 | ||
e959b549 AK |
625 | static ssize_t |
626 | v9fs_direct_read(struct file *filp, char __user *udata, size_t count, | |
627 | loff_t *offsetp) | |
628 | { | |
629 | loff_t size, offset; | |
630 | struct inode *inode; | |
631 | struct address_space *mapping; | |
632 | ||
633 | offset = *offsetp; | |
634 | mapping = filp->f_mapping; | |
635 | inode = mapping->host; | |
636 | if (!count) | |
637 | return 0; | |
638 | size = i_size_read(inode); | |
639 | if (offset < size) | |
640 | filemap_write_and_wait_range(mapping, offset, | |
641 | offset + count - 1); | |
642 | ||
643 | return v9fs_file_read(filp, udata, count, offsetp); | |
644 | } | |
645 | ||
646 | /** | |
647 | * v9fs_cached_file_read - read from a file | |
648 | * @filp: file pointer to read | |
649 | * @udata: user data buffer to read data into | |
650 | * @count: size of buffer | |
651 | * @offset: offset at which to read data | |
652 | * | |
653 | */ | |
654 | static ssize_t | |
655 | v9fs_cached_file_read(struct file *filp, char __user *data, size_t count, | |
656 | loff_t *offset) | |
657 | { | |
658 | if (filp->f_flags & O_DIRECT) | |
659 | return v9fs_direct_read(filp, data, count, offset); | |
660 | return do_sync_read(filp, data, count, offset); | |
661 | } | |
662 | ||
663 | static ssize_t | |
664 | v9fs_direct_write(struct file *filp, const char __user * data, | |
665 | size_t count, loff_t *offsetp) | |
666 | { | |
667 | loff_t offset; | |
668 | ssize_t retval; | |
669 | struct inode *inode; | |
670 | struct address_space *mapping; | |
671 | ||
672 | offset = *offsetp; | |
673 | mapping = filp->f_mapping; | |
674 | inode = mapping->host; | |
675 | if (!count) | |
676 | return 0; | |
677 | ||
678 | mutex_lock(&inode->i_mutex); | |
679 | retval = filemap_write_and_wait_range(mapping, offset, | |
680 | offset + count - 1); | |
681 | if (retval) | |
682 | goto err_out; | |
683 | /* | |
684 | * After a write we want buffered reads to be sure to go to disk to get | |
685 | * the new data. We invalidate clean cached page from the region we're | |
686 | * about to write. We do this *before* the write so that if we fail | |
687 | * here we fall back to buffered write | |
688 | */ | |
689 | if (mapping->nrpages) { | |
690 | pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT; | |
691 | pgoff_t pg_end = (offset + count - 1) >> PAGE_CACHE_SHIFT; | |
692 | ||
693 | retval = invalidate_inode_pages2_range(mapping, | |
694 | pg_start, pg_end); | |
695 | /* | |
696 | * If a page can not be invalidated, fall back | |
697 | * to buffered write. | |
698 | */ | |
699 | if (retval) { | |
700 | if (retval == -EBUSY) | |
701 | goto buff_write; | |
702 | goto err_out; | |
703 | } | |
704 | } | |
705 | retval = v9fs_file_write(filp, data, count, offsetp); | |
706 | err_out: | |
707 | mutex_unlock(&inode->i_mutex); | |
708 | return retval; | |
709 | ||
710 | buff_write: | |
711 | mutex_unlock(&inode->i_mutex); | |
712 | return do_sync_write(filp, data, count, offsetp); | |
713 | } | |
714 | ||
715 | /** | |
716 | * v9fs_cached_file_write - write to a file | |
717 | * @filp: file pointer to write | |
718 | * @data: data buffer to write data from | |
719 | * @count: size of buffer | |
720 | * @offset: offset at which to write data | |
721 | * | |
722 | */ | |
723 | static ssize_t | |
724 | v9fs_cached_file_write(struct file *filp, const char __user * data, | |
725 | size_t count, loff_t *offset) | |
726 | { | |
727 | ||
728 | if (filp->f_flags & O_DIRECT) | |
729 | return v9fs_direct_write(filp, data, count, offset); | |
730 | return do_sync_write(filp, data, count, offset); | |
731 | } | |
732 | ||
7263cebe AK |
733 | static const struct vm_operations_struct v9fs_file_vm_ops = { |
734 | .fault = filemap_fault, | |
735 | .page_mkwrite = v9fs_vm_page_mkwrite, | |
0b173bc4 | 736 | .remap_pages = generic_file_remap_pages, |
7263cebe AK |
737 | }; |
738 | ||
e959b549 | 739 | |
29236f4e | 740 | const struct file_operations v9fs_cached_file_operations = { |
e03abc0c | 741 | .llseek = generic_file_llseek, |
e959b549 AK |
742 | .read = v9fs_cached_file_read, |
743 | .write = v9fs_cached_file_write, | |
e03abc0c | 744 | .aio_read = generic_file_aio_read, |
7263cebe | 745 | .aio_write = generic_file_aio_write, |
e03abc0c EVH |
746 | .open = v9fs_file_open, |
747 | .release = v9fs_dir_release, | |
748 | .lock = v9fs_file_lock, | |
7263cebe | 749 | .mmap = v9fs_file_mmap, |
7a4439c4 | 750 | .fsync = v9fs_file_fsync, |
e03abc0c EVH |
751 | }; |
752 | ||
29236f4e | 753 | const struct file_operations v9fs_cached_file_operations_dotl = { |
b04faaf3 | 754 | .llseek = generic_file_llseek, |
e959b549 AK |
755 | .read = v9fs_cached_file_read, |
756 | .write = v9fs_cached_file_write, | |
b04faaf3 | 757 | .aio_read = generic_file_aio_read, |
7263cebe | 758 | .aio_write = generic_file_aio_write, |
b04faaf3 VJJ |
759 | .open = v9fs_file_open, |
760 | .release = v9fs_dir_release, | |
a099027c MK |
761 | .lock = v9fs_file_lock_dotl, |
762 | .flock = v9fs_file_flock_dotl, | |
7263cebe | 763 | .mmap = v9fs_file_mmap, |
920e65dc | 764 | .fsync = v9fs_file_fsync_dotl, |
b04faaf3 VJJ |
765 | }; |
766 | ||
4b6f5d20 | 767 | const struct file_operations v9fs_file_operations = { |
e69e7fe5 EVH |
768 | .llseek = generic_file_llseek, |
769 | .read = v9fs_file_read, | |
770 | .write = v9fs_file_write, | |
771 | .open = v9fs_file_open, | |
772 | .release = v9fs_dir_release, | |
773 | .lock = v9fs_file_lock, | |
14b8869f | 774 | .mmap = generic_file_readonly_mmap, |
7a4439c4 | 775 | .fsync = v9fs_file_fsync, |
e69e7fe5 | 776 | }; |
9b6533c9 SK |
777 | |
778 | const struct file_operations v9fs_file_operations_dotl = { | |
779 | .llseek = generic_file_llseek, | |
780 | .read = v9fs_file_read, | |
781 | .write = v9fs_file_write, | |
782 | .open = v9fs_file_open, | |
783 | .release = v9fs_dir_release, | |
a099027c MK |
784 | .lock = v9fs_file_lock_dotl, |
785 | .flock = v9fs_file_flock_dotl, | |
9b6533c9 | 786 | .mmap = generic_file_readonly_mmap, |
920e65dc | 787 | .fsync = v9fs_file_fsync_dotl, |
9b6533c9 | 788 | }; |