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> |
7c0f6ba6 | 37 | #include <linux/uaccess.h> |
e69e7fe5 | 38 | #include <linux/idr.h> |
070b3656 | 39 | #include <linux/uio.h> |
ce85dd58 | 40 | #include <linux/slab.h> |
bd238fb4 LI |
41 | #include <net/9p/9p.h> |
42 | #include <net/9p/client.h> | |
e69e7fe5 | 43 | |
e69e7fe5 | 44 | #include "v9fs.h" |
e69e7fe5 EVH |
45 | #include "v9fs_vfs.h" |
46 | #include "fid.h" | |
60e78d2c | 47 | #include "cache.h" |
e69e7fe5 | 48 | |
7263cebe | 49 | static const struct vm_operations_struct v9fs_file_vm_ops; |
fb89b45c | 50 | static const struct vm_operations_struct v9fs_mmap_file_vm_ops; |
7263cebe | 51 | |
e69e7fe5 EVH |
52 | /** |
53 | * v9fs_file_open - open a file (or directory) | |
54 | * @inode: inode to be opened | |
55 | * @file: file being opened | |
56 | * | |
57 | */ | |
58 | ||
59 | int v9fs_file_open(struct inode *inode, struct file *file) | |
60 | { | |
6a3124a3 | 61 | int err; |
6b39f6d2 | 62 | struct v9fs_inode *v9inode; |
bd238fb4 LI |
63 | struct v9fs_session_info *v9ses; |
64 | struct p9_fid *fid; | |
65 | int omode; | |
e69e7fe5 | 66 | |
5d385153 | 67 | p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file); |
6b39f6d2 | 68 | v9inode = V9FS_I(inode); |
bd238fb4 | 69 | v9ses = v9fs_inode2v9ses(inode); |
ef56547e | 70 | if (v9fs_proto_dotl(v9ses)) |
f88657ce | 71 | omode = v9fs_open_to_dotl_flags(file->f_flags); |
ef56547e MK |
72 | else |
73 | omode = v9fs_uflags2omode(file->f_flags, | |
74 | v9fs_proto_dotu(v9ses)); | |
bd238fb4 LI |
75 | fid = file->private_data; |
76 | if (!fid) { | |
b403f0e3 | 77 | fid = v9fs_fid_clone(file_dentry(file)); |
bd238fb4 LI |
78 | if (IS_ERR(fid)) |
79 | return PTR_ERR(fid); | |
80 | ||
81 | err = p9_client_open(fid, omode); | |
9523a841 | 82 | if (err < 0) { |
bd238fb4 LI |
83 | p9_client_clunk(fid); |
84 | return err; | |
85 | } | |
ef56547e MK |
86 | if ((file->f_flags & O_APPEND) && |
87 | (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))) | |
2e4bef41 | 88 | generic_file_llseek(file, 0, SEEK_END); |
6a3124a3 | 89 | } |
e69e7fe5 | 90 | |
bd238fb4 | 91 | file->private_data = fid; |
5a7e0a8c | 92 | mutex_lock(&v9inode->v_mutex); |
fb89b45c DM |
93 | if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && |
94 | !v9inode->writeback_fid && | |
7add697a | 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 | */ | |
b403f0e3 | 103 | fid = v9fs_writeback_fid(file_dentry(file)); |
3cf387d7 AK |
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); |
fb89b45c | 112 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
60e78d2c | 113 | v9fs_cache_inode_set_cookie(inode, file); |
6a3124a3 | 114 | return 0; |
3cf387d7 AK |
115 | out_error: |
116 | p9_client_clunk(file->private_data); | |
117 | file->private_data = NULL; | |
118 | return err; | |
e69e7fe5 EVH |
119 | } |
120 | ||
121 | /** | |
122 | * v9fs_file_lock - lock a file (or directory) | |
ee443996 EVH |
123 | * @filp: file to be locked |
124 | * @cmd: lock command | |
125 | * @fl: file lock structure | |
e69e7fe5 | 126 | * |
ee443996 | 127 | * Bugs: this looks like a local only lock, we should extend into 9P |
e69e7fe5 EVH |
128 | * by using open exclusive |
129 | */ | |
130 | ||
131 | static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) | |
132 | { | |
133 | int res = 0; | |
496ad9aa | 134 | struct inode *inode = file_inode(filp); |
e69e7fe5 | 135 | |
5d385153 | 136 | p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); |
e69e7fe5 EVH |
137 | |
138 | /* No mandatory locks */ | |
f78233dd | 139 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
e69e7fe5 EVH |
140 | return -ENOLCK; |
141 | ||
142 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
28fd1298 | 143 | filemap_write_and_wait(inode->i_mapping); |
fc0ecff6 | 144 | invalidate_mapping_pages(&inode->i_data, 0, -1); |
e69e7fe5 EVH |
145 | } |
146 | ||
147 | return res; | |
148 | } | |
149 | ||
a099027c MK |
150 | static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl) |
151 | { | |
152 | struct p9_flock flock; | |
153 | struct p9_fid *fid; | |
5c4086b8 | 154 | uint8_t status = P9_LOCK_ERROR; |
a099027c MK |
155 | int res = 0; |
156 | unsigned char fl_type; | |
5e172f75 | 157 | struct v9fs_session_info *v9ses; |
a099027c MK |
158 | |
159 | fid = filp->private_data; | |
160 | BUG_ON(fid == NULL); | |
161 | ||
162 | if ((fl->fl_flags & FL_POSIX) != FL_POSIX) | |
163 | BUG(); | |
164 | ||
4f656367 | 165 | res = locks_lock_file_wait(filp, fl); |
a099027c MK |
166 | if (res < 0) |
167 | goto out; | |
168 | ||
169 | /* convert posix lock to p9 tlock args */ | |
170 | memset(&flock, 0, sizeof(flock)); | |
51b8b4fb JG |
171 | /* map the lock type */ |
172 | switch (fl->fl_type) { | |
173 | case F_RDLCK: | |
174 | flock.type = P9_LOCK_TYPE_RDLCK; | |
175 | break; | |
176 | case F_WRLCK: | |
177 | flock.type = P9_LOCK_TYPE_WRLCK; | |
178 | break; | |
179 | case F_UNLCK: | |
180 | flock.type = P9_LOCK_TYPE_UNLCK; | |
181 | break; | |
182 | } | |
a099027c MK |
183 | flock.start = fl->fl_start; |
184 | if (fl->fl_end == OFFSET_MAX) | |
185 | flock.length = 0; | |
186 | else | |
187 | flock.length = fl->fl_end - fl->fl_start + 1; | |
188 | flock.proc_id = fl->fl_pid; | |
50192abe | 189 | flock.client_id = fid->clnt->name; |
a099027c MK |
190 | if (IS_SETLKW(cmd)) |
191 | flock.flags = P9_LOCK_FLAGS_BLOCK; | |
192 | ||
5e172f75 DRCS |
193 | v9ses = v9fs_inode2v9ses(file_inode(filp)); |
194 | ||
a099027c MK |
195 | /* |
196 | * if its a blocked request and we get P9_LOCK_BLOCKED as the status | |
197 | * for lock request, keep on trying | |
198 | */ | |
199 | for (;;) { | |
200 | res = p9_client_lock_dotl(fid, &flock, &status); | |
201 | if (res < 0) | |
ad80492d | 202 | goto out_unlock; |
a099027c MK |
203 | |
204 | if (status != P9_LOCK_BLOCKED) | |
205 | break; | |
206 | if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd)) | |
207 | break; | |
5e172f75 DRCS |
208 | if (schedule_timeout_interruptible(v9ses->session_lock_timeout) |
209 | != 0) | |
a0ea787b | 210 | break; |
b4dc44b3 DM |
211 | /* |
212 | * p9_client_lock_dotl overwrites flock.client_id with the | |
213 | * server message, free and reuse the client name | |
214 | */ | |
215 | if (flock.client_id != fid->clnt->name) { | |
216 | kfree(flock.client_id); | |
217 | flock.client_id = fid->clnt->name; | |
218 | } | |
a099027c MK |
219 | } |
220 | ||
221 | /* map 9p status to VFS status */ | |
222 | switch (status) { | |
223 | case P9_LOCK_SUCCESS: | |
224 | res = 0; | |
225 | break; | |
226 | case P9_LOCK_BLOCKED: | |
227 | res = -EAGAIN; | |
228 | break; | |
b642f726 KS |
229 | default: |
230 | WARN_ONCE(1, "unknown lock status code: %d\n", status); | |
426d5a0f | 231 | /* fall through */ |
a099027c MK |
232 | case P9_LOCK_ERROR: |
233 | case P9_LOCK_GRACE: | |
234 | res = -ENOLCK; | |
235 | break; | |
a099027c MK |
236 | } |
237 | ||
ad80492d | 238 | out_unlock: |
a099027c MK |
239 | /* |
240 | * incase server returned error for lock request, revert | |
241 | * it locally | |
242 | */ | |
243 | if (res < 0 && fl->fl_type != F_UNLCK) { | |
244 | fl_type = fl->fl_type; | |
245 | fl->fl_type = F_UNLCK; | |
b6478740 | 246 | /* Even if this fails we want to return the remote error */ |
2e3078af | 247 | locks_lock_file_wait(filp, fl); |
a099027c MK |
248 | fl->fl_type = fl_type; |
249 | } | |
b4dc44b3 DM |
250 | if (flock.client_id != fid->clnt->name) |
251 | kfree(flock.client_id); | |
a099027c MK |
252 | out: |
253 | return res; | |
254 | } | |
255 | ||
1d769cd1 MK |
256 | static int v9fs_file_getlock(struct file *filp, struct file_lock *fl) |
257 | { | |
258 | struct p9_getlock glock; | |
259 | struct p9_fid *fid; | |
260 | int res = 0; | |
261 | ||
262 | fid = filp->private_data; | |
263 | BUG_ON(fid == NULL); | |
264 | ||
265 | posix_test_lock(filp, fl); | |
266 | /* | |
267 | * if we have a conflicting lock locally, no need to validate | |
268 | * with server | |
269 | */ | |
270 | if (fl->fl_type != F_UNLCK) | |
271 | return res; | |
272 | ||
273 | /* convert posix lock to p9 tgetlock args */ | |
274 | memset(&glock, 0, sizeof(glock)); | |
51b8b4fb | 275 | glock.type = P9_LOCK_TYPE_UNLCK; |
1d769cd1 MK |
276 | glock.start = fl->fl_start; |
277 | if (fl->fl_end == OFFSET_MAX) | |
278 | glock.length = 0; | |
279 | else | |
280 | glock.length = fl->fl_end - fl->fl_start + 1; | |
281 | glock.proc_id = fl->fl_pid; | |
50192abe | 282 | glock.client_id = fid->clnt->name; |
1d769cd1 MK |
283 | |
284 | res = p9_client_getlock_dotl(fid, &glock); | |
285 | if (res < 0) | |
b4dc44b3 | 286 | goto out; |
51b8b4fb JG |
287 | /* map 9p lock type to os lock type */ |
288 | switch (glock.type) { | |
289 | case P9_LOCK_TYPE_RDLCK: | |
290 | fl->fl_type = F_RDLCK; | |
291 | break; | |
292 | case P9_LOCK_TYPE_WRLCK: | |
293 | fl->fl_type = F_WRLCK; | |
294 | break; | |
295 | case P9_LOCK_TYPE_UNLCK: | |
296 | fl->fl_type = F_UNLCK; | |
297 | break; | |
298 | } | |
299 | if (glock.type != P9_LOCK_TYPE_UNLCK) { | |
1d769cd1 MK |
300 | fl->fl_start = glock.start; |
301 | if (glock.length == 0) | |
302 | fl->fl_end = OFFSET_MAX; | |
303 | else | |
304 | fl->fl_end = glock.start + glock.length - 1; | |
9d5b86ac | 305 | fl->fl_pid = -glock.proc_id; |
51b8b4fb | 306 | } |
b4dc44b3 DM |
307 | out: |
308 | if (glock.client_id != fid->clnt->name) | |
309 | kfree(glock.client_id); | |
1d769cd1 MK |
310 | return res; |
311 | } | |
312 | ||
a099027c MK |
313 | /** |
314 | * v9fs_file_lock_dotl - lock a file (or directory) | |
315 | * @filp: file to be locked | |
316 | * @cmd: lock command | |
317 | * @fl: file lock structure | |
318 | * | |
319 | */ | |
320 | ||
321 | static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl) | |
322 | { | |
496ad9aa | 323 | struct inode *inode = file_inode(filp); |
a099027c MK |
324 | int ret = -ENOLCK; |
325 | ||
4b8e9923 AV |
326 | p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n", |
327 | filp, cmd, fl, filp); | |
a099027c MK |
328 | |
329 | /* No mandatory locks */ | |
330 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) | |
331 | goto out_err; | |
332 | ||
333 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
334 | filemap_write_and_wait(inode->i_mapping); | |
335 | invalidate_mapping_pages(&inode->i_data, 0, -1); | |
336 | } | |
337 | ||
338 | if (IS_SETLK(cmd) || IS_SETLKW(cmd)) | |
339 | ret = v9fs_file_do_lock(filp, cmd, fl); | |
1d769cd1 MK |
340 | else if (IS_GETLK(cmd)) |
341 | ret = v9fs_file_getlock(filp, fl); | |
a099027c MK |
342 | else |
343 | ret = -EINVAL; | |
344 | out_err: | |
345 | return ret; | |
346 | } | |
347 | ||
348 | /** | |
349 | * v9fs_file_flock_dotl - lock a file | |
350 | * @filp: file to be locked | |
351 | * @cmd: lock command | |
352 | * @fl: file lock structure | |
353 | * | |
354 | */ | |
355 | ||
356 | static int v9fs_file_flock_dotl(struct file *filp, int cmd, | |
357 | struct file_lock *fl) | |
358 | { | |
496ad9aa | 359 | struct inode *inode = file_inode(filp); |
a099027c MK |
360 | int ret = -ENOLCK; |
361 | ||
4b8e9923 AV |
362 | p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n", |
363 | filp, cmd, fl, filp); | |
a099027c MK |
364 | |
365 | /* No mandatory locks */ | |
366 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) | |
367 | goto out_err; | |
368 | ||
369 | if (!(fl->fl_flags & FL_FLOCK)) | |
370 | goto out_err; | |
371 | ||
372 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
373 | filemap_write_and_wait(inode->i_mapping); | |
374 | invalidate_mapping_pages(&inode->i_data, 0, -1); | |
375 | } | |
376 | /* Convert flock to posix lock */ | |
a099027c MK |
377 | fl->fl_flags |= FL_POSIX; |
378 | fl->fl_flags ^= FL_FLOCK; | |
379 | ||
380 | if (IS_SETLK(cmd) | IS_SETLKW(cmd)) | |
381 | ret = v9fs_file_do_lock(filp, cmd, fl); | |
382 | else | |
383 | ret = -EINVAL; | |
384 | out_err: | |
385 | return ret; | |
386 | } | |
387 | ||
fbedadc1 EVH |
388 | /** |
389 | * v9fs_file_read - read from a file | |
390 | * @filp: file pointer to read | |
391 | * @udata: user data buffer to read data into | |
392 | * @count: size of buffer | |
393 | * @offset: offset at which to read data | |
394 | * | |
395 | */ | |
396 | ||
e69e7fe5 | 397 | static ssize_t |
e494b6b5 | 398 | v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
e69e7fe5 | 399 | { |
e494b6b5 | 400 | struct p9_fid *fid = iocb->ki_filp->private_data; |
b5ac1fb2 | 401 | int ret, err = 0; |
e69e7fe5 | 402 | |
e494b6b5 AV |
403 | p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", |
404 | iov_iter_count(to), iocb->ki_pos); | |
fbedadc1 | 405 | |
e494b6b5 | 406 | ret = p9_client_read(fid, iocb->ki_pos, to, &err); |
e1200fe6 AV |
407 | if (!ret) |
408 | return err; | |
e69e7fe5 | 409 | |
e494b6b5 | 410 | iocb->ki_pos += ret; |
bd238fb4 | 411 | return ret; |
e69e7fe5 EVH |
412 | } |
413 | ||
17311779 AK |
414 | /** |
415 | * v9fs_file_write - write to a file | |
416 | * @filp: file pointer to write | |
417 | * @data: data buffer to write data from | |
418 | * @count: size of buffer | |
419 | * @offset: offset at which to write data | |
420 | * | |
421 | */ | |
422 | static ssize_t | |
e494b6b5 | 423 | v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
17311779 | 424 | { |
e494b6b5 | 425 | struct file *file = iocb->ki_filp; |
3309dd04 AV |
426 | ssize_t retval; |
427 | loff_t origin; | |
c711a6b1 | 428 | int err = 0; |
17311779 | 429 | |
3309dd04 AV |
430 | retval = generic_write_checks(iocb, from); |
431 | if (retval <= 0) | |
c711a6b1 AV |
432 | return retval; |
433 | ||
3309dd04 AV |
434 | origin = iocb->ki_pos; |
435 | retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err); | |
c711a6b1 | 436 | if (retval > 0) { |
e494b6b5 | 437 | struct inode *inode = file_inode(file); |
c711a6b1 AV |
438 | loff_t i_size; |
439 | unsigned long pg_start, pg_end; | |
09cbfeaf KS |
440 | pg_start = origin >> PAGE_SHIFT; |
441 | pg_end = (origin + retval - 1) >> PAGE_SHIFT; | |
c711a6b1 AV |
442 | if (inode->i_mapping && inode->i_mapping->nrpages) |
443 | invalidate_inode_pages2_range(inode->i_mapping, | |
444 | pg_start, pg_end); | |
3309dd04 | 445 | iocb->ki_pos += retval; |
c711a6b1 | 446 | i_size = i_size_read(inode); |
3309dd04 AV |
447 | if (iocb->ki_pos > i_size) { |
448 | inode_add_bytes(inode, iocb->ki_pos - i_size); | |
5e3cc1ee HT |
449 | /* |
450 | * Need to serialize against i_size_write() in | |
451 | * v9fs_stat2inode() | |
452 | */ | |
453 | v9fs_i_size_write(inode, iocb->ki_pos); | |
c711a6b1 AV |
454 | } |
455 | return retval; | |
456 | } | |
457 | return err; | |
e69e7fe5 EVH |
458 | } |
459 | ||
02c24a82 JB |
460 | static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end, |
461 | int datasync) | |
7a4439c4 MK |
462 | { |
463 | struct p9_fid *fid; | |
02c24a82 | 464 | struct inode *inode = filp->f_mapping->host; |
7a4439c4 MK |
465 | struct p9_wstat wstat; |
466 | int retval; | |
467 | ||
3b49c9a1 | 468 | retval = file_write_and_wait_range(filp, start, end); |
02c24a82 JB |
469 | if (retval) |
470 | return retval; | |
471 | ||
5955102c | 472 | inode_lock(inode); |
5d385153 | 473 | p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
7a4439c4 MK |
474 | |
475 | fid = filp->private_data; | |
476 | v9fs_blank_wstat(&wstat); | |
477 | ||
478 | retval = p9_client_wstat(fid, &wstat); | |
5955102c | 479 | inode_unlock(inode); |
02c24a82 | 480 | |
7a4439c4 MK |
481 | return retval; |
482 | } | |
483 | ||
02c24a82 JB |
484 | int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, |
485 | int datasync) | |
920e65dc VJJ |
486 | { |
487 | struct p9_fid *fid; | |
02c24a82 | 488 | struct inode *inode = filp->f_mapping->host; |
920e65dc VJJ |
489 | int retval; |
490 | ||
3b49c9a1 | 491 | retval = file_write_and_wait_range(filp, start, end); |
02c24a82 JB |
492 | if (retval) |
493 | return retval; | |
494 | ||
5955102c | 495 | inode_lock(inode); |
5d385153 | 496 | p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
920e65dc VJJ |
497 | |
498 | fid = filp->private_data; | |
499 | ||
b165d601 | 500 | retval = p9_client_fsync(fid, datasync); |
5955102c | 501 | inode_unlock(inode); |
02c24a82 | 502 | |
920e65dc VJJ |
503 | return retval; |
504 | } | |
505 | ||
7263cebe | 506 | static int |
fb89b45c | 507 | v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma) |
7263cebe AK |
508 | { |
509 | int retval; | |
510 | ||
fb89b45c DM |
511 | |
512 | retval = generic_file_mmap(filp, vma); | |
7263cebe AK |
513 | if (!retval) |
514 | vma->vm_ops = &v9fs_file_vm_ops; | |
515 | ||
516 | return retval; | |
517 | } | |
518 | ||
fb89b45c DM |
519 | static int |
520 | v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma) | |
521 | { | |
522 | int retval; | |
523 | struct inode *inode; | |
524 | struct v9fs_inode *v9inode; | |
525 | struct p9_fid *fid; | |
526 | ||
527 | inode = file_inode(filp); | |
528 | v9inode = V9FS_I(inode); | |
529 | mutex_lock(&v9inode->v_mutex); | |
530 | if (!v9inode->writeback_fid && | |
531 | (vma->vm_flags & VM_WRITE)) { | |
532 | /* | |
533 | * clone a fid and add it to writeback_fid | |
534 | * we do it during mmap instead of | |
535 | * page dirty time via write_begin/page_mkwrite | |
536 | * because we want write after unlink usecase | |
537 | * to work. | |
538 | */ | |
b403f0e3 | 539 | fid = v9fs_writeback_fid(file_dentry(filp)); |
fb89b45c DM |
540 | if (IS_ERR(fid)) { |
541 | retval = PTR_ERR(fid); | |
542 | mutex_unlock(&v9inode->v_mutex); | |
543 | return retval; | |
544 | } | |
545 | v9inode->writeback_fid = (void *) fid; | |
546 | } | |
547 | mutex_unlock(&v9inode->v_mutex); | |
548 | ||
549 | retval = generic_file_mmap(filp, vma); | |
550 | if (!retval) | |
551 | vma->vm_ops = &v9fs_mmap_file_vm_ops; | |
552 | ||
553 | return retval; | |
554 | } | |
555 | ||
fe6340e2 | 556 | static vm_fault_t |
11bac800 | 557 | v9fs_vm_page_mkwrite(struct vm_fault *vmf) |
7263cebe | 558 | { |
6b39f6d2 | 559 | struct v9fs_inode *v9inode; |
7263cebe | 560 | struct page *page = vmf->page; |
11bac800 | 561 | struct file *filp = vmf->vma->vm_file; |
496ad9aa | 562 | struct inode *inode = file_inode(filp); |
7263cebe AK |
563 | |
564 | ||
5d385153 JP |
565 | p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n", |
566 | page, (unsigned long)filp->private_data); | |
7263cebe | 567 | |
120c2bca JK |
568 | /* Update file times before taking page lock */ |
569 | file_update_time(filp); | |
570 | ||
6b39f6d2 | 571 | v9inode = V9FS_I(inode); |
7263cebe AK |
572 | /* make sure the cache has finished storing the page */ |
573 | v9fs_fscache_wait_on_page_write(inode, page); | |
6b39f6d2 | 574 | BUG_ON(!v9inode->writeback_fid); |
7263cebe AK |
575 | lock_page(page); |
576 | if (page->mapping != inode->i_mapping) | |
577 | goto out_unlock; | |
13575ca1 | 578 | wait_for_stable_page(page); |
7263cebe AK |
579 | |
580 | return VM_FAULT_LOCKED; | |
581 | out_unlock: | |
582 | unlock_page(page); | |
583 | return VM_FAULT_NOPAGE; | |
584 | } | |
585 | ||
fb89b45c DM |
586 | /** |
587 | * v9fs_mmap_file_read - read from a file | |
588 | * @filp: file pointer to read | |
fd2916bd | 589 | * @data: user data buffer to read data into |
fb89b45c DM |
590 | * @count: size of buffer |
591 | * @offset: offset at which to read data | |
592 | * | |
593 | */ | |
594 | static ssize_t | |
e494b6b5 | 595 | v9fs_mmap_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
fb89b45c DM |
596 | { |
597 | /* TODO: Check if there are dirty pages */ | |
e494b6b5 | 598 | return v9fs_file_read_iter(iocb, to); |
fb89b45c DM |
599 | } |
600 | ||
fb89b45c DM |
601 | /** |
602 | * v9fs_mmap_file_write - write to a file | |
603 | * @filp: file pointer to write | |
604 | * @data: data buffer to write data from | |
605 | * @count: size of buffer | |
606 | * @offset: offset at which to write data | |
607 | * | |
608 | */ | |
609 | static ssize_t | |
e494b6b5 | 610 | v9fs_mmap_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
fb89b45c DM |
611 | { |
612 | /* | |
613 | * TODO: invalidate mmaps on filp's inode between | |
614 | * offset and offset+count | |
615 | */ | |
e494b6b5 | 616 | return v9fs_file_write_iter(iocb, from); |
fb89b45c DM |
617 | } |
618 | ||
619 | static void v9fs_mmap_vm_close(struct vm_area_struct *vma) | |
620 | { | |
621 | struct inode *inode; | |
622 | ||
623 | struct writeback_control wbc = { | |
624 | .nr_to_write = LONG_MAX, | |
625 | .sync_mode = WB_SYNC_ALL, | |
626 | .range_start = vma->vm_pgoff * PAGE_SIZE, | |
627 | /* absolute end, byte at end included */ | |
628 | .range_end = vma->vm_pgoff * PAGE_SIZE + | |
629 | (vma->vm_end - vma->vm_start - 1), | |
630 | }; | |
631 | ||
632 | ||
633 | p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma); | |
634 | ||
635 | inode = file_inode(vma->vm_file); | |
636 | ||
637 | if (!mapping_cap_writeback_dirty(inode->i_mapping)) | |
638 | wbc.nr_to_write = 0; | |
639 | ||
640 | might_sleep(); | |
641 | sync_inode(inode, &wbc); | |
642 | } | |
643 | ||
644 | ||
7263cebe AK |
645 | static const struct vm_operations_struct v9fs_file_vm_ops = { |
646 | .fault = filemap_fault, | |
f1820361 | 647 | .map_pages = filemap_map_pages, |
7263cebe AK |
648 | .page_mkwrite = v9fs_vm_page_mkwrite, |
649 | }; | |
650 | ||
fb89b45c DM |
651 | static const struct vm_operations_struct v9fs_mmap_file_vm_ops = { |
652 | .close = v9fs_mmap_vm_close, | |
653 | .fault = filemap_fault, | |
f1820361 | 654 | .map_pages = filemap_map_pages, |
fb89b45c | 655 | .page_mkwrite = v9fs_vm_page_mkwrite, |
fb89b45c DM |
656 | }; |
657 | ||
e959b549 | 658 | |
29236f4e | 659 | const struct file_operations v9fs_cached_file_operations = { |
e03abc0c | 660 | .llseek = generic_file_llseek, |
aad4f8bb | 661 | .read_iter = generic_file_read_iter, |
8174202b | 662 | .write_iter = generic_file_write_iter, |
e03abc0c EVH |
663 | .open = v9fs_file_open, |
664 | .release = v9fs_dir_release, | |
665 | .lock = v9fs_file_lock, | |
7263cebe | 666 | .mmap = v9fs_file_mmap, |
7a4439c4 | 667 | .fsync = v9fs_file_fsync, |
e03abc0c EVH |
668 | }; |
669 | ||
29236f4e | 670 | const struct file_operations v9fs_cached_file_operations_dotl = { |
b04faaf3 | 671 | .llseek = generic_file_llseek, |
aad4f8bb | 672 | .read_iter = generic_file_read_iter, |
8174202b | 673 | .write_iter = generic_file_write_iter, |
b04faaf3 VJJ |
674 | .open = v9fs_file_open, |
675 | .release = v9fs_dir_release, | |
a099027c MK |
676 | .lock = v9fs_file_lock_dotl, |
677 | .flock = v9fs_file_flock_dotl, | |
7263cebe | 678 | .mmap = v9fs_file_mmap, |
920e65dc | 679 | .fsync = v9fs_file_fsync_dotl, |
b04faaf3 VJJ |
680 | }; |
681 | ||
4b6f5d20 | 682 | const struct file_operations v9fs_file_operations = { |
e69e7fe5 | 683 | .llseek = generic_file_llseek, |
e494b6b5 AV |
684 | .read_iter = v9fs_file_read_iter, |
685 | .write_iter = v9fs_file_write_iter, | |
e69e7fe5 EVH |
686 | .open = v9fs_file_open, |
687 | .release = v9fs_dir_release, | |
688 | .lock = v9fs_file_lock, | |
14b8869f | 689 | .mmap = generic_file_readonly_mmap, |
7a4439c4 | 690 | .fsync = v9fs_file_fsync, |
e69e7fe5 | 691 | }; |
9b6533c9 SK |
692 | |
693 | const struct file_operations v9fs_file_operations_dotl = { | |
694 | .llseek = generic_file_llseek, | |
e494b6b5 AV |
695 | .read_iter = v9fs_file_read_iter, |
696 | .write_iter = v9fs_file_write_iter, | |
9b6533c9 SK |
697 | .open = v9fs_file_open, |
698 | .release = v9fs_dir_release, | |
a099027c MK |
699 | .lock = v9fs_file_lock_dotl, |
700 | .flock = v9fs_file_flock_dotl, | |
9b6533c9 | 701 | .mmap = generic_file_readonly_mmap, |
920e65dc | 702 | .fsync = v9fs_file_fsync_dotl, |
9b6533c9 | 703 | }; |
fb89b45c DM |
704 | |
705 | const struct file_operations v9fs_mmap_file_operations = { | |
706 | .llseek = generic_file_llseek, | |
e494b6b5 AV |
707 | .read_iter = v9fs_mmap_file_read_iter, |
708 | .write_iter = v9fs_mmap_file_write_iter, | |
fb89b45c DM |
709 | .open = v9fs_file_open, |
710 | .release = v9fs_dir_release, | |
711 | .lock = v9fs_file_lock, | |
712 | .mmap = v9fs_mmap_file_mmap, | |
713 | .fsync = v9fs_file_fsync, | |
714 | }; | |
715 | ||
716 | const struct file_operations v9fs_mmap_file_operations_dotl = { | |
717 | .llseek = generic_file_llseek, | |
e494b6b5 AV |
718 | .read_iter = v9fs_mmap_file_read_iter, |
719 | .write_iter = v9fs_mmap_file_write_iter, | |
fb89b45c DM |
720 | .open = v9fs_file_open, |
721 | .release = v9fs_dir_release, | |
722 | .lock = v9fs_file_lock_dotl, | |
723 | .flock = v9fs_file_flock_dotl, | |
724 | .mmap = v9fs_mmap_file_mmap, | |
725 | .fsync = v9fs_file_fsync_dotl, | |
726 | }; |