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1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e69e7fe5 EVH |
2 | /* |
3 | * linux/fs/9p/vfs_file.c | |
4 | * | |
5 | * This file contians vfs file ops for 9P2000. | |
6 | * | |
7 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
8 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
e69e7fe5 EVH |
9 | */ |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/fs.h> | |
914e2637 | 14 | #include <linux/sched.h> |
e69e7fe5 EVH |
15 | #include <linux/file.h> |
16 | #include <linux/stat.h> | |
17 | #include <linux/string.h> | |
e69e7fe5 | 18 | #include <linux/inet.h> |
e69e7fe5 | 19 | #include <linux/list.h> |
637d020a | 20 | #include <linux/pagemap.h> |
a099027c | 21 | #include <linux/utsname.h> |
7c0f6ba6 | 22 | #include <linux/uaccess.h> |
e69e7fe5 | 23 | #include <linux/idr.h> |
070b3656 | 24 | #include <linux/uio.h> |
ce85dd58 | 25 | #include <linux/slab.h> |
bd238fb4 LI |
26 | #include <net/9p/9p.h> |
27 | #include <net/9p/client.h> | |
e69e7fe5 | 28 | |
e69e7fe5 | 29 | #include "v9fs.h" |
e69e7fe5 EVH |
30 | #include "v9fs_vfs.h" |
31 | #include "fid.h" | |
60e78d2c | 32 | #include "cache.h" |
e69e7fe5 | 33 | |
7263cebe | 34 | static const struct vm_operations_struct v9fs_file_vm_ops; |
fb89b45c | 35 | static const struct vm_operations_struct v9fs_mmap_file_vm_ops; |
7263cebe | 36 | |
e69e7fe5 EVH |
37 | /** |
38 | * v9fs_file_open - open a file (or directory) | |
39 | * @inode: inode to be opened | |
40 | * @file: file being opened | |
41 | * | |
42 | */ | |
43 | ||
44 | int v9fs_file_open(struct inode *inode, struct file *file) | |
45 | { | |
6a3124a3 | 46 | int err; |
6b39f6d2 | 47 | struct v9fs_inode *v9inode; |
bd238fb4 LI |
48 | struct v9fs_session_info *v9ses; |
49 | struct p9_fid *fid; | |
50 | int omode; | |
e69e7fe5 | 51 | |
5d385153 | 52 | p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file); |
6b39f6d2 | 53 | v9inode = V9FS_I(inode); |
bd238fb4 | 54 | v9ses = v9fs_inode2v9ses(inode); |
ef56547e | 55 | if (v9fs_proto_dotl(v9ses)) |
f88657ce | 56 | omode = v9fs_open_to_dotl_flags(file->f_flags); |
ef56547e MK |
57 | else |
58 | omode = v9fs_uflags2omode(file->f_flags, | |
59 | v9fs_proto_dotu(v9ses)); | |
bd238fb4 LI |
60 | fid = file->private_data; |
61 | if (!fid) { | |
b403f0e3 | 62 | fid = v9fs_fid_clone(file_dentry(file)); |
bd238fb4 LI |
63 | if (IS_ERR(fid)) |
64 | return PTR_ERR(fid); | |
65 | ||
66 | err = p9_client_open(fid, omode); | |
9523a841 | 67 | if (err < 0) { |
bd238fb4 LI |
68 | p9_client_clunk(fid); |
69 | return err; | |
70 | } | |
ef56547e MK |
71 | if ((file->f_flags & O_APPEND) && |
72 | (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))) | |
2e4bef41 | 73 | generic_file_llseek(file, 0, SEEK_END); |
6a3124a3 | 74 | } |
e69e7fe5 | 75 | |
bd238fb4 | 76 | file->private_data = fid; |
5a7e0a8c | 77 | mutex_lock(&v9inode->v_mutex); |
fb89b45c DM |
78 | if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && |
79 | !v9inode->writeback_fid && | |
7add697a | 80 | ((file->f_flags & O_ACCMODE) != O_RDONLY)) { |
3cf387d7 | 81 | /* |
6b39f6d2 | 82 | * clone a fid and add it to writeback_fid |
3cf387d7 AK |
83 | * we do it during open time instead of |
84 | * page dirty time via write_begin/page_mkwrite | |
85 | * because we want write after unlink usecase | |
86 | * to work. | |
87 | */ | |
b403f0e3 | 88 | fid = v9fs_writeback_fid(file_dentry(file)); |
3cf387d7 AK |
89 | if (IS_ERR(fid)) { |
90 | err = PTR_ERR(fid); | |
5a7e0a8c | 91 | mutex_unlock(&v9inode->v_mutex); |
3cf387d7 AK |
92 | goto out_error; |
93 | } | |
6b39f6d2 | 94 | v9inode->writeback_fid = (void *) fid; |
3cf387d7 | 95 | } |
5a7e0a8c | 96 | mutex_unlock(&v9inode->v_mutex); |
fb89b45c | 97 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
60e78d2c | 98 | v9fs_cache_inode_set_cookie(inode, file); |
6a3124a3 | 99 | return 0; |
3cf387d7 AK |
100 | out_error: |
101 | p9_client_clunk(file->private_data); | |
102 | file->private_data = NULL; | |
103 | return err; | |
e69e7fe5 EVH |
104 | } |
105 | ||
106 | /** | |
107 | * v9fs_file_lock - lock a file (or directory) | |
ee443996 EVH |
108 | * @filp: file to be locked |
109 | * @cmd: lock command | |
110 | * @fl: file lock structure | |
e69e7fe5 | 111 | * |
ee443996 | 112 | * Bugs: this looks like a local only lock, we should extend into 9P |
e69e7fe5 EVH |
113 | * by using open exclusive |
114 | */ | |
115 | ||
116 | static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) | |
117 | { | |
118 | int res = 0; | |
496ad9aa | 119 | struct inode *inode = file_inode(filp); |
e69e7fe5 | 120 | |
5d385153 | 121 | p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); |
e69e7fe5 EVH |
122 | |
123 | /* No mandatory locks */ | |
f78233dd | 124 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
e69e7fe5 EVH |
125 | return -ENOLCK; |
126 | ||
127 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
28fd1298 | 128 | filemap_write_and_wait(inode->i_mapping); |
fc0ecff6 | 129 | invalidate_mapping_pages(&inode->i_data, 0, -1); |
e69e7fe5 EVH |
130 | } |
131 | ||
132 | return res; | |
133 | } | |
134 | ||
a099027c MK |
135 | static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl) |
136 | { | |
137 | struct p9_flock flock; | |
138 | struct p9_fid *fid; | |
5c4086b8 | 139 | uint8_t status = P9_LOCK_ERROR; |
a099027c MK |
140 | int res = 0; |
141 | unsigned char fl_type; | |
5e172f75 | 142 | struct v9fs_session_info *v9ses; |
a099027c MK |
143 | |
144 | fid = filp->private_data; | |
145 | BUG_ON(fid == NULL); | |
146 | ||
147 | if ((fl->fl_flags & FL_POSIX) != FL_POSIX) | |
148 | BUG(); | |
149 | ||
4f656367 | 150 | res = locks_lock_file_wait(filp, fl); |
a099027c MK |
151 | if (res < 0) |
152 | goto out; | |
153 | ||
154 | /* convert posix lock to p9 tlock args */ | |
155 | memset(&flock, 0, sizeof(flock)); | |
51b8b4fb JG |
156 | /* map the lock type */ |
157 | switch (fl->fl_type) { | |
158 | case F_RDLCK: | |
159 | flock.type = P9_LOCK_TYPE_RDLCK; | |
160 | break; | |
161 | case F_WRLCK: | |
162 | flock.type = P9_LOCK_TYPE_WRLCK; | |
163 | break; | |
164 | case F_UNLCK: | |
165 | flock.type = P9_LOCK_TYPE_UNLCK; | |
166 | break; | |
167 | } | |
a099027c MK |
168 | flock.start = fl->fl_start; |
169 | if (fl->fl_end == OFFSET_MAX) | |
170 | flock.length = 0; | |
171 | else | |
172 | flock.length = fl->fl_end - fl->fl_start + 1; | |
173 | flock.proc_id = fl->fl_pid; | |
50192abe | 174 | flock.client_id = fid->clnt->name; |
a099027c MK |
175 | if (IS_SETLKW(cmd)) |
176 | flock.flags = P9_LOCK_FLAGS_BLOCK; | |
177 | ||
5e172f75 DRCS |
178 | v9ses = v9fs_inode2v9ses(file_inode(filp)); |
179 | ||
a099027c MK |
180 | /* |
181 | * if its a blocked request and we get P9_LOCK_BLOCKED as the status | |
182 | * for lock request, keep on trying | |
183 | */ | |
184 | for (;;) { | |
185 | res = p9_client_lock_dotl(fid, &flock, &status); | |
186 | if (res < 0) | |
ad80492d | 187 | goto out_unlock; |
a099027c MK |
188 | |
189 | if (status != P9_LOCK_BLOCKED) | |
190 | break; | |
191 | if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd)) | |
192 | break; | |
5e172f75 DRCS |
193 | if (schedule_timeout_interruptible(v9ses->session_lock_timeout) |
194 | != 0) | |
a0ea787b | 195 | break; |
b4dc44b3 DM |
196 | /* |
197 | * p9_client_lock_dotl overwrites flock.client_id with the | |
198 | * server message, free and reuse the client name | |
199 | */ | |
200 | if (flock.client_id != fid->clnt->name) { | |
201 | kfree(flock.client_id); | |
202 | flock.client_id = fid->clnt->name; | |
203 | } | |
a099027c MK |
204 | } |
205 | ||
206 | /* map 9p status to VFS status */ | |
207 | switch (status) { | |
208 | case P9_LOCK_SUCCESS: | |
209 | res = 0; | |
210 | break; | |
211 | case P9_LOCK_BLOCKED: | |
212 | res = -EAGAIN; | |
213 | break; | |
b642f726 KS |
214 | default: |
215 | WARN_ONCE(1, "unknown lock status code: %d\n", status); | |
426d5a0f | 216 | /* fall through */ |
a099027c MK |
217 | case P9_LOCK_ERROR: |
218 | case P9_LOCK_GRACE: | |
219 | res = -ENOLCK; | |
220 | break; | |
a099027c MK |
221 | } |
222 | ||
ad80492d | 223 | out_unlock: |
a099027c MK |
224 | /* |
225 | * incase server returned error for lock request, revert | |
226 | * it locally | |
227 | */ | |
228 | if (res < 0 && fl->fl_type != F_UNLCK) { | |
229 | fl_type = fl->fl_type; | |
230 | fl->fl_type = F_UNLCK; | |
b6478740 | 231 | /* Even if this fails we want to return the remote error */ |
2e3078af | 232 | locks_lock_file_wait(filp, fl); |
a099027c MK |
233 | fl->fl_type = fl_type; |
234 | } | |
b4dc44b3 DM |
235 | if (flock.client_id != fid->clnt->name) |
236 | kfree(flock.client_id); | |
a099027c MK |
237 | out: |
238 | return res; | |
239 | } | |
240 | ||
1d769cd1 MK |
241 | static int v9fs_file_getlock(struct file *filp, struct file_lock *fl) |
242 | { | |
243 | struct p9_getlock glock; | |
244 | struct p9_fid *fid; | |
245 | int res = 0; | |
246 | ||
247 | fid = filp->private_data; | |
248 | BUG_ON(fid == NULL); | |
249 | ||
250 | posix_test_lock(filp, fl); | |
251 | /* | |
252 | * if we have a conflicting lock locally, no need to validate | |
253 | * with server | |
254 | */ | |
255 | if (fl->fl_type != F_UNLCK) | |
256 | return res; | |
257 | ||
258 | /* convert posix lock to p9 tgetlock args */ | |
259 | memset(&glock, 0, sizeof(glock)); | |
51b8b4fb | 260 | glock.type = P9_LOCK_TYPE_UNLCK; |
1d769cd1 MK |
261 | glock.start = fl->fl_start; |
262 | if (fl->fl_end == OFFSET_MAX) | |
263 | glock.length = 0; | |
264 | else | |
265 | glock.length = fl->fl_end - fl->fl_start + 1; | |
266 | glock.proc_id = fl->fl_pid; | |
50192abe | 267 | glock.client_id = fid->clnt->name; |
1d769cd1 MK |
268 | |
269 | res = p9_client_getlock_dotl(fid, &glock); | |
270 | if (res < 0) | |
b4dc44b3 | 271 | goto out; |
51b8b4fb JG |
272 | /* map 9p lock type to os lock type */ |
273 | switch (glock.type) { | |
274 | case P9_LOCK_TYPE_RDLCK: | |
275 | fl->fl_type = F_RDLCK; | |
276 | break; | |
277 | case P9_LOCK_TYPE_WRLCK: | |
278 | fl->fl_type = F_WRLCK; | |
279 | break; | |
280 | case P9_LOCK_TYPE_UNLCK: | |
281 | fl->fl_type = F_UNLCK; | |
282 | break; | |
283 | } | |
284 | if (glock.type != P9_LOCK_TYPE_UNLCK) { | |
1d769cd1 MK |
285 | fl->fl_start = glock.start; |
286 | if (glock.length == 0) | |
287 | fl->fl_end = OFFSET_MAX; | |
288 | else | |
289 | fl->fl_end = glock.start + glock.length - 1; | |
9d5b86ac | 290 | fl->fl_pid = -glock.proc_id; |
51b8b4fb | 291 | } |
b4dc44b3 DM |
292 | out: |
293 | if (glock.client_id != fid->clnt->name) | |
294 | kfree(glock.client_id); | |
1d769cd1 MK |
295 | return res; |
296 | } | |
297 | ||
a099027c MK |
298 | /** |
299 | * v9fs_file_lock_dotl - lock a file (or directory) | |
300 | * @filp: file to be locked | |
301 | * @cmd: lock command | |
302 | * @fl: file lock structure | |
303 | * | |
304 | */ | |
305 | ||
306 | static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl) | |
307 | { | |
496ad9aa | 308 | struct inode *inode = file_inode(filp); |
a099027c MK |
309 | int ret = -ENOLCK; |
310 | ||
4b8e9923 AV |
311 | p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n", |
312 | filp, cmd, fl, filp); | |
a099027c MK |
313 | |
314 | /* No mandatory locks */ | |
315 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) | |
316 | goto out_err; | |
317 | ||
318 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
319 | filemap_write_and_wait(inode->i_mapping); | |
320 | invalidate_mapping_pages(&inode->i_data, 0, -1); | |
321 | } | |
322 | ||
323 | if (IS_SETLK(cmd) || IS_SETLKW(cmd)) | |
324 | ret = v9fs_file_do_lock(filp, cmd, fl); | |
1d769cd1 MK |
325 | else if (IS_GETLK(cmd)) |
326 | ret = v9fs_file_getlock(filp, fl); | |
a099027c MK |
327 | else |
328 | ret = -EINVAL; | |
329 | out_err: | |
330 | return ret; | |
331 | } | |
332 | ||
333 | /** | |
334 | * v9fs_file_flock_dotl - lock a file | |
335 | * @filp: file to be locked | |
336 | * @cmd: lock command | |
337 | * @fl: file lock structure | |
338 | * | |
339 | */ | |
340 | ||
341 | static int v9fs_file_flock_dotl(struct file *filp, int cmd, | |
342 | struct file_lock *fl) | |
343 | { | |
496ad9aa | 344 | struct inode *inode = file_inode(filp); |
a099027c MK |
345 | int ret = -ENOLCK; |
346 | ||
4b8e9923 AV |
347 | p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n", |
348 | filp, cmd, fl, filp); | |
a099027c MK |
349 | |
350 | /* No mandatory locks */ | |
351 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) | |
352 | goto out_err; | |
353 | ||
354 | if (!(fl->fl_flags & FL_FLOCK)) | |
355 | goto out_err; | |
356 | ||
357 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
358 | filemap_write_and_wait(inode->i_mapping); | |
359 | invalidate_mapping_pages(&inode->i_data, 0, -1); | |
360 | } | |
361 | /* Convert flock to posix lock */ | |
a099027c MK |
362 | fl->fl_flags |= FL_POSIX; |
363 | fl->fl_flags ^= FL_FLOCK; | |
364 | ||
365 | if (IS_SETLK(cmd) | IS_SETLKW(cmd)) | |
366 | ret = v9fs_file_do_lock(filp, cmd, fl); | |
367 | else | |
368 | ret = -EINVAL; | |
369 | out_err: | |
370 | return ret; | |
371 | } | |
372 | ||
fbedadc1 EVH |
373 | /** |
374 | * v9fs_file_read - read from a file | |
375 | * @filp: file pointer to read | |
376 | * @udata: user data buffer to read data into | |
377 | * @count: size of buffer | |
378 | * @offset: offset at which to read data | |
379 | * | |
380 | */ | |
381 | ||
e69e7fe5 | 382 | static ssize_t |
e494b6b5 | 383 | v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
e69e7fe5 | 384 | { |
e494b6b5 | 385 | struct p9_fid *fid = iocb->ki_filp->private_data; |
b5ac1fb2 | 386 | int ret, err = 0; |
e69e7fe5 | 387 | |
e494b6b5 AV |
388 | p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", |
389 | iov_iter_count(to), iocb->ki_pos); | |
fbedadc1 | 390 | |
e494b6b5 | 391 | ret = p9_client_read(fid, iocb->ki_pos, to, &err); |
e1200fe6 AV |
392 | if (!ret) |
393 | return err; | |
e69e7fe5 | 394 | |
e494b6b5 | 395 | iocb->ki_pos += ret; |
bd238fb4 | 396 | return ret; |
e69e7fe5 EVH |
397 | } |
398 | ||
17311779 AK |
399 | /** |
400 | * v9fs_file_write - write to a file | |
401 | * @filp: file pointer to write | |
402 | * @data: data buffer to write data from | |
403 | * @count: size of buffer | |
404 | * @offset: offset at which to write data | |
405 | * | |
406 | */ | |
407 | static ssize_t | |
e494b6b5 | 408 | v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
17311779 | 409 | { |
e494b6b5 | 410 | struct file *file = iocb->ki_filp; |
3309dd04 AV |
411 | ssize_t retval; |
412 | loff_t origin; | |
c711a6b1 | 413 | int err = 0; |
17311779 | 414 | |
3309dd04 AV |
415 | retval = generic_write_checks(iocb, from); |
416 | if (retval <= 0) | |
c711a6b1 AV |
417 | return retval; |
418 | ||
3309dd04 AV |
419 | origin = iocb->ki_pos; |
420 | retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err); | |
c711a6b1 | 421 | if (retval > 0) { |
e494b6b5 | 422 | struct inode *inode = file_inode(file); |
c711a6b1 AV |
423 | loff_t i_size; |
424 | unsigned long pg_start, pg_end; | |
09cbfeaf KS |
425 | pg_start = origin >> PAGE_SHIFT; |
426 | pg_end = (origin + retval - 1) >> PAGE_SHIFT; | |
c711a6b1 AV |
427 | if (inode->i_mapping && inode->i_mapping->nrpages) |
428 | invalidate_inode_pages2_range(inode->i_mapping, | |
429 | pg_start, pg_end); | |
3309dd04 | 430 | iocb->ki_pos += retval; |
c711a6b1 | 431 | i_size = i_size_read(inode); |
3309dd04 AV |
432 | if (iocb->ki_pos > i_size) { |
433 | inode_add_bytes(inode, iocb->ki_pos - i_size); | |
5e3cc1ee HT |
434 | /* |
435 | * Need to serialize against i_size_write() in | |
436 | * v9fs_stat2inode() | |
437 | */ | |
438 | v9fs_i_size_write(inode, iocb->ki_pos); | |
c711a6b1 AV |
439 | } |
440 | return retval; | |
441 | } | |
442 | return err; | |
e69e7fe5 EVH |
443 | } |
444 | ||
02c24a82 JB |
445 | static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end, |
446 | int datasync) | |
7a4439c4 MK |
447 | { |
448 | struct p9_fid *fid; | |
02c24a82 | 449 | struct inode *inode = filp->f_mapping->host; |
7a4439c4 MK |
450 | struct p9_wstat wstat; |
451 | int retval; | |
452 | ||
3b49c9a1 | 453 | retval = file_write_and_wait_range(filp, start, end); |
02c24a82 JB |
454 | if (retval) |
455 | return retval; | |
456 | ||
5955102c | 457 | inode_lock(inode); |
5d385153 | 458 | p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
7a4439c4 MK |
459 | |
460 | fid = filp->private_data; | |
461 | v9fs_blank_wstat(&wstat); | |
462 | ||
463 | retval = p9_client_wstat(fid, &wstat); | |
5955102c | 464 | inode_unlock(inode); |
02c24a82 | 465 | |
7a4439c4 MK |
466 | return retval; |
467 | } | |
468 | ||
02c24a82 JB |
469 | int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, |
470 | int datasync) | |
920e65dc VJJ |
471 | { |
472 | struct p9_fid *fid; | |
02c24a82 | 473 | struct inode *inode = filp->f_mapping->host; |
920e65dc VJJ |
474 | int retval; |
475 | ||
3b49c9a1 | 476 | retval = file_write_and_wait_range(filp, start, end); |
02c24a82 JB |
477 | if (retval) |
478 | return retval; | |
479 | ||
5955102c | 480 | inode_lock(inode); |
5d385153 | 481 | p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
920e65dc VJJ |
482 | |
483 | fid = filp->private_data; | |
484 | ||
b165d601 | 485 | retval = p9_client_fsync(fid, datasync); |
5955102c | 486 | inode_unlock(inode); |
02c24a82 | 487 | |
920e65dc VJJ |
488 | return retval; |
489 | } | |
490 | ||
7263cebe | 491 | static int |
fb89b45c | 492 | v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma) |
7263cebe AK |
493 | { |
494 | int retval; | |
495 | ||
fb89b45c DM |
496 | |
497 | retval = generic_file_mmap(filp, vma); | |
7263cebe AK |
498 | if (!retval) |
499 | vma->vm_ops = &v9fs_file_vm_ops; | |
500 | ||
501 | return retval; | |
502 | } | |
503 | ||
fb89b45c DM |
504 | static int |
505 | v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma) | |
506 | { | |
507 | int retval; | |
508 | struct inode *inode; | |
509 | struct v9fs_inode *v9inode; | |
510 | struct p9_fid *fid; | |
511 | ||
512 | inode = file_inode(filp); | |
513 | v9inode = V9FS_I(inode); | |
514 | mutex_lock(&v9inode->v_mutex); | |
515 | if (!v9inode->writeback_fid && | |
516 | (vma->vm_flags & VM_WRITE)) { | |
517 | /* | |
518 | * clone a fid and add it to writeback_fid | |
519 | * we do it during mmap instead of | |
520 | * page dirty time via write_begin/page_mkwrite | |
521 | * because we want write after unlink usecase | |
522 | * to work. | |
523 | */ | |
b403f0e3 | 524 | fid = v9fs_writeback_fid(file_dentry(filp)); |
fb89b45c DM |
525 | if (IS_ERR(fid)) { |
526 | retval = PTR_ERR(fid); | |
527 | mutex_unlock(&v9inode->v_mutex); | |
528 | return retval; | |
529 | } | |
530 | v9inode->writeback_fid = (void *) fid; | |
531 | } | |
532 | mutex_unlock(&v9inode->v_mutex); | |
533 | ||
534 | retval = generic_file_mmap(filp, vma); | |
535 | if (!retval) | |
536 | vma->vm_ops = &v9fs_mmap_file_vm_ops; | |
537 | ||
538 | return retval; | |
539 | } | |
540 | ||
fe6340e2 | 541 | static vm_fault_t |
11bac800 | 542 | v9fs_vm_page_mkwrite(struct vm_fault *vmf) |
7263cebe | 543 | { |
6b39f6d2 | 544 | struct v9fs_inode *v9inode; |
7263cebe | 545 | struct page *page = vmf->page; |
11bac800 | 546 | struct file *filp = vmf->vma->vm_file; |
496ad9aa | 547 | struct inode *inode = file_inode(filp); |
7263cebe AK |
548 | |
549 | ||
5d385153 JP |
550 | p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n", |
551 | page, (unsigned long)filp->private_data); | |
7263cebe | 552 | |
120c2bca JK |
553 | /* Update file times before taking page lock */ |
554 | file_update_time(filp); | |
555 | ||
6b39f6d2 | 556 | v9inode = V9FS_I(inode); |
7263cebe AK |
557 | /* make sure the cache has finished storing the page */ |
558 | v9fs_fscache_wait_on_page_write(inode, page); | |
6b39f6d2 | 559 | BUG_ON(!v9inode->writeback_fid); |
7263cebe AK |
560 | lock_page(page); |
561 | if (page->mapping != inode->i_mapping) | |
562 | goto out_unlock; | |
13575ca1 | 563 | wait_for_stable_page(page); |
7263cebe AK |
564 | |
565 | return VM_FAULT_LOCKED; | |
566 | out_unlock: | |
567 | unlock_page(page); | |
568 | return VM_FAULT_NOPAGE; | |
569 | } | |
570 | ||
fb89b45c DM |
571 | /** |
572 | * v9fs_mmap_file_read - read from a file | |
573 | * @filp: file pointer to read | |
fd2916bd | 574 | * @data: user data buffer to read data into |
fb89b45c DM |
575 | * @count: size of buffer |
576 | * @offset: offset at which to read data | |
577 | * | |
578 | */ | |
579 | static ssize_t | |
e494b6b5 | 580 | v9fs_mmap_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
fb89b45c DM |
581 | { |
582 | /* TODO: Check if there are dirty pages */ | |
e494b6b5 | 583 | return v9fs_file_read_iter(iocb, to); |
fb89b45c DM |
584 | } |
585 | ||
fb89b45c DM |
586 | /** |
587 | * v9fs_mmap_file_write - write to a file | |
588 | * @filp: file pointer to write | |
589 | * @data: data buffer to write data from | |
590 | * @count: size of buffer | |
591 | * @offset: offset at which to write data | |
592 | * | |
593 | */ | |
594 | static ssize_t | |
e494b6b5 | 595 | v9fs_mmap_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
fb89b45c DM |
596 | { |
597 | /* | |
598 | * TODO: invalidate mmaps on filp's inode between | |
599 | * offset and offset+count | |
600 | */ | |
e494b6b5 | 601 | return v9fs_file_write_iter(iocb, from); |
fb89b45c DM |
602 | } |
603 | ||
604 | static void v9fs_mmap_vm_close(struct vm_area_struct *vma) | |
605 | { | |
606 | struct inode *inode; | |
607 | ||
608 | struct writeback_control wbc = { | |
609 | .nr_to_write = LONG_MAX, | |
610 | .sync_mode = WB_SYNC_ALL, | |
611 | .range_start = vma->vm_pgoff * PAGE_SIZE, | |
612 | /* absolute end, byte at end included */ | |
613 | .range_end = vma->vm_pgoff * PAGE_SIZE + | |
614 | (vma->vm_end - vma->vm_start - 1), | |
615 | }; | |
616 | ||
617 | ||
618 | p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma); | |
619 | ||
620 | inode = file_inode(vma->vm_file); | |
621 | ||
622 | if (!mapping_cap_writeback_dirty(inode->i_mapping)) | |
623 | wbc.nr_to_write = 0; | |
624 | ||
625 | might_sleep(); | |
626 | sync_inode(inode, &wbc); | |
627 | } | |
628 | ||
629 | ||
7263cebe AK |
630 | static const struct vm_operations_struct v9fs_file_vm_ops = { |
631 | .fault = filemap_fault, | |
f1820361 | 632 | .map_pages = filemap_map_pages, |
7263cebe AK |
633 | .page_mkwrite = v9fs_vm_page_mkwrite, |
634 | }; | |
635 | ||
fb89b45c DM |
636 | static const struct vm_operations_struct v9fs_mmap_file_vm_ops = { |
637 | .close = v9fs_mmap_vm_close, | |
638 | .fault = filemap_fault, | |
f1820361 | 639 | .map_pages = filemap_map_pages, |
fb89b45c | 640 | .page_mkwrite = v9fs_vm_page_mkwrite, |
fb89b45c DM |
641 | }; |
642 | ||
e959b549 | 643 | |
29236f4e | 644 | const struct file_operations v9fs_cached_file_operations = { |
e03abc0c | 645 | .llseek = generic_file_llseek, |
aad4f8bb | 646 | .read_iter = generic_file_read_iter, |
8174202b | 647 | .write_iter = generic_file_write_iter, |
e03abc0c EVH |
648 | .open = v9fs_file_open, |
649 | .release = v9fs_dir_release, | |
650 | .lock = v9fs_file_lock, | |
7263cebe | 651 | .mmap = v9fs_file_mmap, |
7a4439c4 | 652 | .fsync = v9fs_file_fsync, |
e03abc0c EVH |
653 | }; |
654 | ||
29236f4e | 655 | const struct file_operations v9fs_cached_file_operations_dotl = { |
b04faaf3 | 656 | .llseek = generic_file_llseek, |
aad4f8bb | 657 | .read_iter = generic_file_read_iter, |
8174202b | 658 | .write_iter = generic_file_write_iter, |
b04faaf3 VJJ |
659 | .open = v9fs_file_open, |
660 | .release = v9fs_dir_release, | |
a099027c MK |
661 | .lock = v9fs_file_lock_dotl, |
662 | .flock = v9fs_file_flock_dotl, | |
7263cebe | 663 | .mmap = v9fs_file_mmap, |
920e65dc | 664 | .fsync = v9fs_file_fsync_dotl, |
b04faaf3 VJJ |
665 | }; |
666 | ||
4b6f5d20 | 667 | const struct file_operations v9fs_file_operations = { |
e69e7fe5 | 668 | .llseek = generic_file_llseek, |
e494b6b5 AV |
669 | .read_iter = v9fs_file_read_iter, |
670 | .write_iter = v9fs_file_write_iter, | |
e69e7fe5 EVH |
671 | .open = v9fs_file_open, |
672 | .release = v9fs_dir_release, | |
673 | .lock = v9fs_file_lock, | |
14b8869f | 674 | .mmap = generic_file_readonly_mmap, |
7a4439c4 | 675 | .fsync = v9fs_file_fsync, |
e69e7fe5 | 676 | }; |
9b6533c9 SK |
677 | |
678 | const struct file_operations v9fs_file_operations_dotl = { | |
679 | .llseek = generic_file_llseek, | |
e494b6b5 AV |
680 | .read_iter = v9fs_file_read_iter, |
681 | .write_iter = v9fs_file_write_iter, | |
9b6533c9 SK |
682 | .open = v9fs_file_open, |
683 | .release = v9fs_dir_release, | |
a099027c MK |
684 | .lock = v9fs_file_lock_dotl, |
685 | .flock = v9fs_file_flock_dotl, | |
9b6533c9 | 686 | .mmap = generic_file_readonly_mmap, |
920e65dc | 687 | .fsync = v9fs_file_fsync_dotl, |
9b6533c9 | 688 | }; |
fb89b45c DM |
689 | |
690 | const struct file_operations v9fs_mmap_file_operations = { | |
691 | .llseek = generic_file_llseek, | |
e494b6b5 AV |
692 | .read_iter = v9fs_mmap_file_read_iter, |
693 | .write_iter = v9fs_mmap_file_write_iter, | |
fb89b45c DM |
694 | .open = v9fs_file_open, |
695 | .release = v9fs_dir_release, | |
696 | .lock = v9fs_file_lock, | |
697 | .mmap = v9fs_mmap_file_mmap, | |
698 | .fsync = v9fs_file_fsync, | |
699 | }; | |
700 | ||
701 | const struct file_operations v9fs_mmap_file_operations_dotl = { | |
702 | .llseek = generic_file_llseek, | |
e494b6b5 AV |
703 | .read_iter = v9fs_mmap_file_read_iter, |
704 | .write_iter = v9fs_mmap_file_write_iter, | |
fb89b45c DM |
705 | .open = v9fs_file_open, |
706 | .release = v9fs_dir_release, | |
707 | .lock = v9fs_file_lock_dotl, | |
708 | .flock = v9fs_file_flock_dotl, | |
709 | .mmap = v9fs_mmap_file_mmap, | |
710 | .fsync = v9fs_file_fsync_dotl, | |
711 | }; |