Commit | Line | Data |
---|---|---|
b6aeaded MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
3 | Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu> | |
4 | ||
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/kernel.h> | |
14 | ||
45323fb7 MS |
15 | static struct file_operations fuse_direct_io_file_operations; |
16 | ||
fd72faac MS |
17 | static int fuse_send_open(struct inode *inode, struct file *file, int isdir, |
18 | struct fuse_open_out *outargp) | |
b6aeaded MS |
19 | { |
20 | struct fuse_conn *fc = get_fuse_conn(inode); | |
b6aeaded | 21 | struct fuse_open_in inarg; |
fd72faac MS |
22 | struct fuse_req *req; |
23 | int err; | |
24 | ||
25 | req = fuse_get_request(fc); | |
26 | if (!req) | |
27 | return -EINTR; | |
28 | ||
29 | memset(&inarg, 0, sizeof(inarg)); | |
30 | inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC); | |
31 | req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; | |
32 | req->in.h.nodeid = get_node_id(inode); | |
33 | req->inode = inode; | |
34 | req->in.numargs = 1; | |
35 | req->in.args[0].size = sizeof(inarg); | |
36 | req->in.args[0].value = &inarg; | |
37 | req->out.numargs = 1; | |
38 | req->out.args[0].size = sizeof(*outargp); | |
39 | req->out.args[0].value = outargp; | |
40 | request_send(fc, req); | |
41 | err = req->out.h.error; | |
42 | fuse_put_request(fc, req); | |
43 | ||
44 | return err; | |
45 | } | |
46 | ||
47 | struct fuse_file *fuse_file_alloc(void) | |
48 | { | |
49 | struct fuse_file *ff; | |
50 | ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL); | |
51 | if (ff) { | |
52 | ff->release_req = fuse_request_alloc(); | |
53 | if (!ff->release_req) { | |
54 | kfree(ff); | |
55 | ff = NULL; | |
56 | } | |
57 | } | |
58 | return ff; | |
59 | } | |
60 | ||
61 | void fuse_file_free(struct fuse_file *ff) | |
62 | { | |
63 | fuse_request_free(ff->release_req); | |
64 | kfree(ff); | |
65 | } | |
66 | ||
67 | void fuse_finish_open(struct inode *inode, struct file *file, | |
68 | struct fuse_file *ff, struct fuse_open_out *outarg) | |
69 | { | |
70 | if (outarg->open_flags & FOPEN_DIRECT_IO) | |
71 | file->f_op = &fuse_direct_io_file_operations; | |
72 | if (!(outarg->open_flags & FOPEN_KEEP_CACHE)) | |
73 | invalidate_inode_pages(inode->i_mapping); | |
74 | ff->fh = outarg->fh; | |
75 | file->private_data = ff; | |
76 | } | |
77 | ||
78 | int fuse_open_common(struct inode *inode, struct file *file, int isdir) | |
79 | { | |
b6aeaded MS |
80 | struct fuse_open_out outarg; |
81 | struct fuse_file *ff; | |
82 | int err; | |
b6aeaded | 83 | |
dd190d06 MS |
84 | /* VFS checks this, but only _after_ ->open() */ |
85 | if (file->f_flags & O_DIRECT) | |
86 | return -EINVAL; | |
87 | ||
b6aeaded MS |
88 | err = generic_file_open(inode, file); |
89 | if (err) | |
90 | return err; | |
91 | ||
92 | /* If opening the root node, no lookup has been performed on | |
93 | it, so the attributes must be refreshed */ | |
94 | if (get_node_id(inode) == FUSE_ROOT_ID) { | |
fd72faac | 95 | err = fuse_do_getattr(inode); |
b6aeaded MS |
96 | if (err) |
97 | return err; | |
98 | } | |
99 | ||
fd72faac | 100 | ff = fuse_file_alloc(); |
b6aeaded | 101 | if (!ff) |
fd72faac | 102 | return -ENOMEM; |
b6aeaded | 103 | |
fd72faac MS |
104 | err = fuse_send_open(inode, file, isdir, &outarg); |
105 | if (err) | |
106 | fuse_file_free(ff); | |
107 | else { | |
108 | if (isdir) | |
109 | outarg.open_flags &= ~FOPEN_DIRECT_IO; | |
110 | fuse_finish_open(inode, file, ff, &outarg); | |
b6aeaded MS |
111 | } |
112 | ||
b6aeaded MS |
113 | return err; |
114 | } | |
115 | ||
fd72faac MS |
116 | void fuse_send_release(struct fuse_conn *fc, struct fuse_file *ff, |
117 | u64 nodeid, struct inode *inode, int flags, int isdir) | |
b6aeaded | 118 | { |
fd72faac | 119 | struct fuse_req * req = ff->release_req; |
b6aeaded MS |
120 | struct fuse_release_in *inarg = &req->misc.release_in; |
121 | ||
122 | inarg->fh = ff->fh; | |
fd72faac | 123 | inarg->flags = flags; |
04730fef | 124 | req->in.h.opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE; |
fd72faac | 125 | req->in.h.nodeid = nodeid; |
b6aeaded MS |
126 | req->inode = inode; |
127 | req->in.numargs = 1; | |
128 | req->in.args[0].size = sizeof(struct fuse_release_in); | |
129 | req->in.args[0].value = inarg; | |
130 | request_send_background(fc, req); | |
131 | kfree(ff); | |
fd72faac MS |
132 | } |
133 | ||
134 | int fuse_release_common(struct inode *inode, struct file *file, int isdir) | |
135 | { | |
136 | struct fuse_file *ff = file->private_data; | |
137 | if (ff) { | |
138 | struct fuse_conn *fc = get_fuse_conn(inode); | |
139 | u64 nodeid = get_node_id(inode); | |
140 | fuse_send_release(fc, ff, nodeid, inode, file->f_flags, isdir); | |
141 | } | |
b6aeaded MS |
142 | |
143 | /* Return value is ignored by VFS */ | |
144 | return 0; | |
145 | } | |
146 | ||
04730fef MS |
147 | static int fuse_open(struct inode *inode, struct file *file) |
148 | { | |
149 | return fuse_open_common(inode, file, 0); | |
150 | } | |
151 | ||
152 | static int fuse_release(struct inode *inode, struct file *file) | |
153 | { | |
154 | return fuse_release_common(inode, file, 0); | |
155 | } | |
156 | ||
b6aeaded MS |
157 | static int fuse_flush(struct file *file) |
158 | { | |
159 | struct inode *inode = file->f_dentry->d_inode; | |
160 | struct fuse_conn *fc = get_fuse_conn(inode); | |
161 | struct fuse_file *ff = file->private_data; | |
162 | struct fuse_req *req; | |
163 | struct fuse_flush_in inarg; | |
164 | int err; | |
165 | ||
248d86e8 MS |
166 | if (is_bad_inode(inode)) |
167 | return -EIO; | |
168 | ||
b6aeaded MS |
169 | if (fc->no_flush) |
170 | return 0; | |
171 | ||
7c352bdf | 172 | req = fuse_get_request(fc); |
b6aeaded MS |
173 | if (!req) |
174 | return -EINTR; | |
175 | ||
176 | memset(&inarg, 0, sizeof(inarg)); | |
177 | inarg.fh = ff->fh; | |
178 | req->in.h.opcode = FUSE_FLUSH; | |
179 | req->in.h.nodeid = get_node_id(inode); | |
180 | req->inode = inode; | |
181 | req->file = file; | |
182 | req->in.numargs = 1; | |
183 | req->in.args[0].size = sizeof(inarg); | |
184 | req->in.args[0].value = &inarg; | |
7c352bdf | 185 | request_send(fc, req); |
b6aeaded MS |
186 | err = req->out.h.error; |
187 | fuse_put_request(fc, req); | |
188 | if (err == -ENOSYS) { | |
189 | fc->no_flush = 1; | |
190 | err = 0; | |
191 | } | |
192 | return err; | |
193 | } | |
194 | ||
82547981 MS |
195 | int fuse_fsync_common(struct file *file, struct dentry *de, int datasync, |
196 | int isdir) | |
b6aeaded MS |
197 | { |
198 | struct inode *inode = de->d_inode; | |
199 | struct fuse_conn *fc = get_fuse_conn(inode); | |
200 | struct fuse_file *ff = file->private_data; | |
201 | struct fuse_req *req; | |
202 | struct fuse_fsync_in inarg; | |
203 | int err; | |
204 | ||
248d86e8 MS |
205 | if (is_bad_inode(inode)) |
206 | return -EIO; | |
207 | ||
82547981 | 208 | if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir)) |
b6aeaded MS |
209 | return 0; |
210 | ||
211 | req = fuse_get_request(fc); | |
212 | if (!req) | |
7c352bdf | 213 | return -EINTR; |
b6aeaded MS |
214 | |
215 | memset(&inarg, 0, sizeof(inarg)); | |
216 | inarg.fh = ff->fh; | |
217 | inarg.fsync_flags = datasync ? 1 : 0; | |
82547981 | 218 | req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC; |
b6aeaded MS |
219 | req->in.h.nodeid = get_node_id(inode); |
220 | req->inode = inode; | |
221 | req->file = file; | |
222 | req->in.numargs = 1; | |
223 | req->in.args[0].size = sizeof(inarg); | |
224 | req->in.args[0].value = &inarg; | |
225 | request_send(fc, req); | |
226 | err = req->out.h.error; | |
227 | fuse_put_request(fc, req); | |
228 | if (err == -ENOSYS) { | |
82547981 MS |
229 | if (isdir) |
230 | fc->no_fsyncdir = 1; | |
231 | else | |
232 | fc->no_fsync = 1; | |
b6aeaded MS |
233 | err = 0; |
234 | } | |
235 | return err; | |
236 | } | |
237 | ||
82547981 MS |
238 | static int fuse_fsync(struct file *file, struct dentry *de, int datasync) |
239 | { | |
240 | return fuse_fsync_common(file, de, datasync, 0); | |
241 | } | |
242 | ||
04730fef MS |
243 | size_t fuse_send_read_common(struct fuse_req *req, struct file *file, |
244 | struct inode *inode, loff_t pos, size_t count, | |
245 | int isdir) | |
b6aeaded MS |
246 | { |
247 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248 | struct fuse_file *ff = file->private_data; | |
249 | struct fuse_read_in inarg; | |
250 | ||
251 | memset(&inarg, 0, sizeof(struct fuse_read_in)); | |
252 | inarg.fh = ff->fh; | |
253 | inarg.offset = pos; | |
254 | inarg.size = count; | |
04730fef | 255 | req->in.h.opcode = isdir ? FUSE_READDIR : FUSE_READ; |
b6aeaded MS |
256 | req->in.h.nodeid = get_node_id(inode); |
257 | req->inode = inode; | |
258 | req->file = file; | |
259 | req->in.numargs = 1; | |
260 | req->in.args[0].size = sizeof(struct fuse_read_in); | |
261 | req->in.args[0].value = &inarg; | |
262 | req->out.argpages = 1; | |
263 | req->out.argvar = 1; | |
264 | req->out.numargs = 1; | |
265 | req->out.args[0].size = count; | |
7c352bdf | 266 | request_send(fc, req); |
b6aeaded MS |
267 | return req->out.args[0].size; |
268 | } | |
269 | ||
04730fef MS |
270 | static inline size_t fuse_send_read(struct fuse_req *req, struct file *file, |
271 | struct inode *inode, loff_t pos, | |
272 | size_t count) | |
273 | { | |
274 | return fuse_send_read_common(req, file, inode, pos, count, 0); | |
275 | } | |
276 | ||
b6aeaded MS |
277 | static int fuse_readpage(struct file *file, struct page *page) |
278 | { | |
279 | struct inode *inode = page->mapping->host; | |
280 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 MS |
281 | struct fuse_req *req; |
282 | int err; | |
283 | ||
284 | err = -EIO; | |
285 | if (is_bad_inode(inode)) | |
286 | goto out; | |
287 | ||
288 | err = -EINTR; | |
289 | req = fuse_get_request(fc); | |
b6aeaded MS |
290 | if (!req) |
291 | goto out; | |
292 | ||
293 | req->out.page_zeroing = 1; | |
294 | req->num_pages = 1; | |
295 | req->pages[0] = page; | |
4633a22e | 296 | fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE); |
b6aeaded MS |
297 | err = req->out.h.error; |
298 | fuse_put_request(fc, req); | |
299 | if (!err) | |
300 | SetPageUptodate(page); | |
b36c31ba | 301 | fuse_invalidate_attr(inode); /* atime changed */ |
b6aeaded MS |
302 | out: |
303 | unlock_page(page); | |
304 | return err; | |
305 | } | |
306 | ||
db50b96c MS |
307 | static int fuse_send_readpages(struct fuse_req *req, struct file *file, |
308 | struct inode *inode) | |
309 | { | |
4633a22e | 310 | loff_t pos = page_offset(req->pages[0]); |
db50b96c MS |
311 | size_t count = req->num_pages << PAGE_CACHE_SHIFT; |
312 | unsigned i; | |
313 | req->out.page_zeroing = 1; | |
314 | fuse_send_read(req, file, inode, pos, count); | |
315 | for (i = 0; i < req->num_pages; i++) { | |
316 | struct page *page = req->pages[i]; | |
317 | if (!req->out.h.error) | |
318 | SetPageUptodate(page); | |
319 | unlock_page(page); | |
320 | } | |
321 | return req->out.h.error; | |
322 | } | |
323 | ||
324 | struct fuse_readpages_data { | |
325 | struct fuse_req *req; | |
326 | struct file *file; | |
327 | struct inode *inode; | |
328 | }; | |
329 | ||
330 | static int fuse_readpages_fill(void *_data, struct page *page) | |
331 | { | |
332 | struct fuse_readpages_data *data = _data; | |
333 | struct fuse_req *req = data->req; | |
334 | struct inode *inode = data->inode; | |
335 | struct fuse_conn *fc = get_fuse_conn(inode); | |
336 | ||
337 | if (req->num_pages && | |
338 | (req->num_pages == FUSE_MAX_PAGES_PER_REQ || | |
339 | (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read || | |
340 | req->pages[req->num_pages - 1]->index + 1 != page->index)) { | |
341 | int err = fuse_send_readpages(req, data->file, inode); | |
342 | if (err) { | |
343 | unlock_page(page); | |
344 | return err; | |
345 | } | |
346 | fuse_reset_request(req); | |
347 | } | |
348 | req->pages[req->num_pages] = page; | |
349 | req->num_pages ++; | |
350 | return 0; | |
351 | } | |
352 | ||
353 | static int fuse_readpages(struct file *file, struct address_space *mapping, | |
354 | struct list_head *pages, unsigned nr_pages) | |
355 | { | |
356 | struct inode *inode = mapping->host; | |
357 | struct fuse_conn *fc = get_fuse_conn(inode); | |
358 | struct fuse_readpages_data data; | |
359 | int err; | |
248d86e8 MS |
360 | |
361 | if (is_bad_inode(inode)) | |
362 | return -EIO; | |
363 | ||
db50b96c MS |
364 | data.file = file; |
365 | data.inode = inode; | |
7c352bdf | 366 | data.req = fuse_get_request(fc); |
db50b96c MS |
367 | if (!data.req) |
368 | return -EINTR; | |
369 | ||
370 | err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); | |
371 | if (!err && data.req->num_pages) | |
372 | err = fuse_send_readpages(data.req, file, inode); | |
373 | fuse_put_request(fc, data.req); | |
b36c31ba | 374 | fuse_invalidate_attr(inode); /* atime changed */ |
db50b96c MS |
375 | return err; |
376 | } | |
377 | ||
04730fef MS |
378 | static size_t fuse_send_write(struct fuse_req *req, struct file *file, |
379 | struct inode *inode, loff_t pos, size_t count) | |
b6aeaded MS |
380 | { |
381 | struct fuse_conn *fc = get_fuse_conn(inode); | |
382 | struct fuse_file *ff = file->private_data; | |
383 | struct fuse_write_in inarg; | |
384 | struct fuse_write_out outarg; | |
385 | ||
386 | memset(&inarg, 0, sizeof(struct fuse_write_in)); | |
387 | inarg.fh = ff->fh; | |
388 | inarg.offset = pos; | |
389 | inarg.size = count; | |
390 | req->in.h.opcode = FUSE_WRITE; | |
391 | req->in.h.nodeid = get_node_id(inode); | |
392 | req->inode = inode; | |
393 | req->file = file; | |
394 | req->in.argpages = 1; | |
395 | req->in.numargs = 2; | |
396 | req->in.args[0].size = sizeof(struct fuse_write_in); | |
397 | req->in.args[0].value = &inarg; | |
398 | req->in.args[1].size = count; | |
399 | req->out.numargs = 1; | |
400 | req->out.args[0].size = sizeof(struct fuse_write_out); | |
401 | req->out.args[0].value = &outarg; | |
7c352bdf | 402 | request_send(fc, req); |
b6aeaded MS |
403 | return outarg.size; |
404 | } | |
405 | ||
406 | static int fuse_prepare_write(struct file *file, struct page *page, | |
407 | unsigned offset, unsigned to) | |
408 | { | |
409 | /* No op */ | |
410 | return 0; | |
411 | } | |
412 | ||
413 | static int fuse_commit_write(struct file *file, struct page *page, | |
414 | unsigned offset, unsigned to) | |
415 | { | |
416 | int err; | |
04730fef | 417 | size_t nres; |
b6aeaded MS |
418 | unsigned count = to - offset; |
419 | struct inode *inode = page->mapping->host; | |
420 | struct fuse_conn *fc = get_fuse_conn(inode); | |
4633a22e | 421 | loff_t pos = page_offset(page) + offset; |
248d86e8 MS |
422 | struct fuse_req *req; |
423 | ||
424 | if (is_bad_inode(inode)) | |
425 | return -EIO; | |
426 | ||
427 | req = fuse_get_request(fc); | |
b6aeaded MS |
428 | if (!req) |
429 | return -EINTR; | |
430 | ||
431 | req->num_pages = 1; | |
432 | req->pages[0] = page; | |
433 | req->page_offset = offset; | |
434 | nres = fuse_send_write(req, file, inode, pos, count); | |
435 | err = req->out.h.error; | |
436 | fuse_put_request(fc, req); | |
437 | if (!err && nres != count) | |
438 | err = -EIO; | |
439 | if (!err) { | |
440 | pos += count; | |
441 | if (pos > i_size_read(inode)) | |
442 | i_size_write(inode, pos); | |
443 | ||
444 | if (offset == 0 && to == PAGE_CACHE_SIZE) { | |
445 | clear_page_dirty(page); | |
446 | SetPageUptodate(page); | |
447 | } | |
b36c31ba MS |
448 | } |
449 | fuse_invalidate_attr(inode); | |
b6aeaded MS |
450 | return err; |
451 | } | |
452 | ||
413ef8cb MS |
453 | static void fuse_release_user_pages(struct fuse_req *req, int write) |
454 | { | |
455 | unsigned i; | |
456 | ||
457 | for (i = 0; i < req->num_pages; i++) { | |
458 | struct page *page = req->pages[i]; | |
459 | if (write) | |
460 | set_page_dirty_lock(page); | |
461 | put_page(page); | |
462 | } | |
463 | } | |
464 | ||
465 | static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf, | |
466 | unsigned nbytes, int write) | |
467 | { | |
468 | unsigned long user_addr = (unsigned long) buf; | |
469 | unsigned offset = user_addr & ~PAGE_MASK; | |
470 | int npages; | |
471 | ||
472 | /* This doesn't work with nfsd */ | |
473 | if (!current->mm) | |
474 | return -EPERM; | |
475 | ||
476 | nbytes = min(nbytes, (unsigned) FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT); | |
477 | npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
6ad84aca | 478 | npages = min(max(npages, 1), FUSE_MAX_PAGES_PER_REQ); |
413ef8cb MS |
479 | down_read(¤t->mm->mmap_sem); |
480 | npages = get_user_pages(current, current->mm, user_addr, npages, write, | |
481 | 0, req->pages, NULL); | |
482 | up_read(¤t->mm->mmap_sem); | |
483 | if (npages < 0) | |
484 | return npages; | |
485 | ||
486 | req->num_pages = npages; | |
487 | req->page_offset = offset; | |
488 | return 0; | |
489 | } | |
490 | ||
491 | static ssize_t fuse_direct_io(struct file *file, const char __user *buf, | |
492 | size_t count, loff_t *ppos, int write) | |
493 | { | |
494 | struct inode *inode = file->f_dentry->d_inode; | |
495 | struct fuse_conn *fc = get_fuse_conn(inode); | |
496 | size_t nmax = write ? fc->max_write : fc->max_read; | |
497 | loff_t pos = *ppos; | |
498 | ssize_t res = 0; | |
248d86e8 MS |
499 | struct fuse_req *req; |
500 | ||
501 | if (is_bad_inode(inode)) | |
502 | return -EIO; | |
503 | ||
504 | req = fuse_get_request(fc); | |
413ef8cb | 505 | if (!req) |
7c352bdf | 506 | return -EINTR; |
413ef8cb MS |
507 | |
508 | while (count) { | |
413ef8cb MS |
509 | size_t nres; |
510 | size_t nbytes = min(count, nmax); | |
511 | int err = fuse_get_user_pages(req, buf, nbytes, !write); | |
512 | if (err) { | |
513 | res = err; | |
514 | break; | |
515 | } | |
6ad84aca MS |
516 | nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset; |
517 | nbytes = min(count, nbytes); | |
413ef8cb MS |
518 | if (write) |
519 | nres = fuse_send_write(req, file, inode, pos, nbytes); | |
520 | else | |
521 | nres = fuse_send_read(req, file, inode, pos, nbytes); | |
522 | fuse_release_user_pages(req, !write); | |
523 | if (req->out.h.error) { | |
524 | if (!res) | |
525 | res = req->out.h.error; | |
526 | break; | |
527 | } else if (nres > nbytes) { | |
528 | res = -EIO; | |
529 | break; | |
530 | } | |
531 | count -= nres; | |
532 | res += nres; | |
533 | pos += nres; | |
534 | buf += nres; | |
535 | if (nres != nbytes) | |
536 | break; | |
537 | if (count) | |
538 | fuse_reset_request(req); | |
539 | } | |
540 | fuse_put_request(fc, req); | |
541 | if (res > 0) { | |
542 | if (write && pos > i_size_read(inode)) | |
543 | i_size_write(inode, pos); | |
544 | *ppos = pos; | |
b36c31ba MS |
545 | } |
546 | fuse_invalidate_attr(inode); | |
413ef8cb MS |
547 | |
548 | return res; | |
549 | } | |
550 | ||
551 | static ssize_t fuse_direct_read(struct file *file, char __user *buf, | |
552 | size_t count, loff_t *ppos) | |
553 | { | |
554 | return fuse_direct_io(file, buf, count, ppos, 0); | |
555 | } | |
556 | ||
557 | static ssize_t fuse_direct_write(struct file *file, const char __user *buf, | |
558 | size_t count, loff_t *ppos) | |
559 | { | |
560 | struct inode *inode = file->f_dentry->d_inode; | |
561 | ssize_t res; | |
562 | /* Don't allow parallel writes to the same file */ | |
563 | down(&inode->i_sem); | |
564 | res = fuse_direct_io(file, buf, count, ppos, 1); | |
565 | up(&inode->i_sem); | |
566 | return res; | |
567 | } | |
568 | ||
b6aeaded MS |
569 | static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) |
570 | { | |
571 | if ((vma->vm_flags & VM_SHARED)) { | |
572 | if ((vma->vm_flags & VM_WRITE)) | |
573 | return -ENODEV; | |
574 | else | |
575 | vma->vm_flags &= ~VM_MAYWRITE; | |
576 | } | |
577 | return generic_file_mmap(file, vma); | |
578 | } | |
579 | ||
580 | static int fuse_set_page_dirty(struct page *page) | |
581 | { | |
582 | printk("fuse_set_page_dirty: should not happen\n"); | |
583 | dump_stack(); | |
584 | return 0; | |
585 | } | |
586 | ||
587 | static struct file_operations fuse_file_operations = { | |
588 | .llseek = generic_file_llseek, | |
589 | .read = generic_file_read, | |
590 | .write = generic_file_write, | |
591 | .mmap = fuse_file_mmap, | |
592 | .open = fuse_open, | |
593 | .flush = fuse_flush, | |
594 | .release = fuse_release, | |
595 | .fsync = fuse_fsync, | |
596 | .sendfile = generic_file_sendfile, | |
597 | }; | |
598 | ||
413ef8cb MS |
599 | static struct file_operations fuse_direct_io_file_operations = { |
600 | .llseek = generic_file_llseek, | |
601 | .read = fuse_direct_read, | |
602 | .write = fuse_direct_write, | |
603 | .open = fuse_open, | |
604 | .flush = fuse_flush, | |
605 | .release = fuse_release, | |
606 | .fsync = fuse_fsync, | |
607 | /* no mmap and sendfile */ | |
608 | }; | |
609 | ||
b6aeaded MS |
610 | static struct address_space_operations fuse_file_aops = { |
611 | .readpage = fuse_readpage, | |
612 | .prepare_write = fuse_prepare_write, | |
613 | .commit_write = fuse_commit_write, | |
db50b96c | 614 | .readpages = fuse_readpages, |
b6aeaded MS |
615 | .set_page_dirty = fuse_set_page_dirty, |
616 | }; | |
617 | ||
618 | void fuse_init_file_inode(struct inode *inode) | |
619 | { | |
45323fb7 MS |
620 | inode->i_fop = &fuse_file_operations; |
621 | inode->i_data.a_ops = &fuse_file_aops; | |
b6aeaded | 622 | } |