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Commit | Line | Data |
---|---|---|
b6aeaded MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
b6aeaded MS |
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> | |
e8edc6e0 | 14 | #include <linux/sched.h> |
08cbf542 | 15 | #include <linux/module.h> |
d9d318d3 | 16 | #include <linux/compat.h> |
b6aeaded | 17 | |
4b6f5d20 | 18 | static const struct file_operations fuse_direct_io_file_operations; |
45323fb7 | 19 | |
91fe96b4 MS |
20 | static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
21 | int opcode, struct fuse_open_out *outargp) | |
b6aeaded | 22 | { |
b6aeaded | 23 | struct fuse_open_in inarg; |
fd72faac MS |
24 | struct fuse_req *req; |
25 | int err; | |
26 | ||
ce1d5a49 MS |
27 | req = fuse_get_req(fc); |
28 | if (IS_ERR(req)) | |
29 | return PTR_ERR(req); | |
fd72faac MS |
30 | |
31 | memset(&inarg, 0, sizeof(inarg)); | |
6ff958ed MS |
32 | inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY); |
33 | if (!fc->atomic_o_trunc) | |
34 | inarg.flags &= ~O_TRUNC; | |
91fe96b4 MS |
35 | req->in.h.opcode = opcode; |
36 | req->in.h.nodeid = nodeid; | |
fd72faac MS |
37 | req->in.numargs = 1; |
38 | req->in.args[0].size = sizeof(inarg); | |
39 | req->in.args[0].value = &inarg; | |
40 | req->out.numargs = 1; | |
41 | req->out.args[0].size = sizeof(*outargp); | |
42 | req->out.args[0].value = outargp; | |
b93f858a | 43 | fuse_request_send(fc, req); |
fd72faac MS |
44 | err = req->out.h.error; |
45 | fuse_put_request(fc, req); | |
46 | ||
47 | return err; | |
48 | } | |
49 | ||
acf99433 | 50 | struct fuse_file *fuse_file_alloc(struct fuse_conn *fc) |
fd72faac MS |
51 | { |
52 | struct fuse_file *ff; | |
6b2db28a | 53 | |
fd72faac | 54 | ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL); |
6b2db28a TH |
55 | if (unlikely(!ff)) |
56 | return NULL; | |
57 | ||
da5e4714 | 58 | ff->fc = fc; |
6b2db28a TH |
59 | ff->reserved_req = fuse_request_alloc(); |
60 | if (unlikely(!ff->reserved_req)) { | |
61 | kfree(ff); | |
62 | return NULL; | |
fd72faac | 63 | } |
6b2db28a TH |
64 | |
65 | INIT_LIST_HEAD(&ff->write_entry); | |
66 | atomic_set(&ff->count, 0); | |
67 | RB_CLEAR_NODE(&ff->polled_node); | |
68 | init_waitqueue_head(&ff->poll_wait); | |
69 | ||
70 | spin_lock(&fc->lock); | |
71 | ff->kh = ++fc->khctr; | |
72 | spin_unlock(&fc->lock); | |
73 | ||
fd72faac MS |
74 | return ff; |
75 | } | |
76 | ||
77 | void fuse_file_free(struct fuse_file *ff) | |
78 | { | |
33649c91 | 79 | fuse_request_free(ff->reserved_req); |
fd72faac MS |
80 | kfree(ff); |
81 | } | |
82 | ||
c7b7143c | 83 | struct fuse_file *fuse_file_get(struct fuse_file *ff) |
c756e0a4 MS |
84 | { |
85 | atomic_inc(&ff->count); | |
86 | return ff; | |
87 | } | |
88 | ||
819c4b3b MS |
89 | static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req) |
90 | { | |
b0be46eb | 91 | path_put(&req->misc.release.path); |
819c4b3b MS |
92 | } |
93 | ||
c756e0a4 MS |
94 | static void fuse_file_put(struct fuse_file *ff) |
95 | { | |
96 | if (atomic_dec_and_test(&ff->count)) { | |
97 | struct fuse_req *req = ff->reserved_req; | |
8b0797a4 | 98 | |
819c4b3b | 99 | req->end = fuse_release_end; |
8b0797a4 | 100 | fuse_request_send_background(ff->fc, req); |
c756e0a4 MS |
101 | kfree(ff); |
102 | } | |
103 | } | |
104 | ||
08cbf542 TH |
105 | int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
106 | bool isdir) | |
91fe96b4 MS |
107 | { |
108 | struct fuse_open_out outarg; | |
109 | struct fuse_file *ff; | |
110 | int err; | |
111 | int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; | |
112 | ||
113 | ff = fuse_file_alloc(fc); | |
114 | if (!ff) | |
115 | return -ENOMEM; | |
116 | ||
117 | err = fuse_send_open(fc, nodeid, file, opcode, &outarg); | |
118 | if (err) { | |
119 | fuse_file_free(ff); | |
120 | return err; | |
121 | } | |
122 | ||
123 | if (isdir) | |
124 | outarg.open_flags &= ~FOPEN_DIRECT_IO; | |
125 | ||
126 | ff->fh = outarg.fh; | |
127 | ff->nodeid = nodeid; | |
128 | ff->open_flags = outarg.open_flags; | |
129 | file->private_data = fuse_file_get(ff); | |
130 | ||
131 | return 0; | |
132 | } | |
08cbf542 | 133 | EXPORT_SYMBOL_GPL(fuse_do_open); |
91fe96b4 | 134 | |
c7b7143c | 135 | void fuse_finish_open(struct inode *inode, struct file *file) |
fd72faac | 136 | { |
c7b7143c | 137 | struct fuse_file *ff = file->private_data; |
a0822c55 | 138 | struct fuse_conn *fc = get_fuse_conn(inode); |
c7b7143c MS |
139 | |
140 | if (ff->open_flags & FOPEN_DIRECT_IO) | |
fd72faac | 141 | file->f_op = &fuse_direct_io_file_operations; |
c7b7143c | 142 | if (!(ff->open_flags & FOPEN_KEEP_CACHE)) |
b1009979 | 143 | invalidate_inode_pages2(inode->i_mapping); |
c7b7143c | 144 | if (ff->open_flags & FOPEN_NONSEEKABLE) |
a7c1b990 | 145 | nonseekable_open(inode, file); |
a0822c55 KS |
146 | if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC)) { |
147 | struct fuse_inode *fi = get_fuse_inode(inode); | |
148 | ||
149 | spin_lock(&fc->lock); | |
150 | fi->attr_version = ++fc->attr_version; | |
151 | i_size_write(inode, 0); | |
152 | spin_unlock(&fc->lock); | |
153 | fuse_invalidate_attr(inode); | |
154 | } | |
fd72faac MS |
155 | } |
156 | ||
91fe96b4 | 157 | int fuse_open_common(struct inode *inode, struct file *file, bool isdir) |
fd72faac | 158 | { |
acf99433 | 159 | struct fuse_conn *fc = get_fuse_conn(inode); |
b6aeaded | 160 | int err; |
b6aeaded | 161 | |
dd190d06 MS |
162 | /* VFS checks this, but only _after_ ->open() */ |
163 | if (file->f_flags & O_DIRECT) | |
164 | return -EINVAL; | |
165 | ||
b6aeaded MS |
166 | err = generic_file_open(inode, file); |
167 | if (err) | |
168 | return err; | |
169 | ||
91fe96b4 | 170 | err = fuse_do_open(fc, get_node_id(inode), file, isdir); |
fd72faac | 171 | if (err) |
91fe96b4 | 172 | return err; |
b6aeaded | 173 | |
91fe96b4 MS |
174 | fuse_finish_open(inode, file); |
175 | ||
176 | return 0; | |
b6aeaded MS |
177 | } |
178 | ||
8b0797a4 | 179 | static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode) |
64c6d8ed | 180 | { |
8b0797a4 | 181 | struct fuse_conn *fc = ff->fc; |
33649c91 | 182 | struct fuse_req *req = ff->reserved_req; |
b57d4264 | 183 | struct fuse_release_in *inarg = &req->misc.release.in; |
b6aeaded | 184 | |
8b0797a4 MS |
185 | spin_lock(&fc->lock); |
186 | list_del(&ff->write_entry); | |
187 | if (!RB_EMPTY_NODE(&ff->polled_node)) | |
188 | rb_erase(&ff->polled_node, &fc->polled_files); | |
189 | spin_unlock(&fc->lock); | |
190 | ||
191 | wake_up_interruptible_sync(&ff->poll_wait); | |
192 | ||
b6aeaded | 193 | inarg->fh = ff->fh; |
fd72faac | 194 | inarg->flags = flags; |
51eb01e7 | 195 | req->in.h.opcode = opcode; |
c7b7143c | 196 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
197 | req->in.numargs = 1; |
198 | req->in.args[0].size = sizeof(struct fuse_release_in); | |
199 | req->in.args[0].value = inarg; | |
fd72faac MS |
200 | } |
201 | ||
8b0797a4 | 202 | void fuse_release_common(struct file *file, int opcode) |
fd72faac | 203 | { |
6b2db28a TH |
204 | struct fuse_file *ff; |
205 | struct fuse_req *req; | |
b6aeaded | 206 | |
6b2db28a TH |
207 | ff = file->private_data; |
208 | if (unlikely(!ff)) | |
8b0797a4 | 209 | return; |
6b2db28a | 210 | |
6b2db28a | 211 | req = ff->reserved_req; |
8b0797a4 | 212 | fuse_prepare_release(ff, file->f_flags, opcode); |
6b2db28a TH |
213 | |
214 | /* Hold vfsmount and dentry until release is finished */ | |
b0be46eb MS |
215 | path_get(&file->f_path); |
216 | req->misc.release.path = file->f_path; | |
6b2db28a | 217 | |
6b2db28a TH |
218 | /* |
219 | * Normally this will send the RELEASE request, however if | |
220 | * some asynchronous READ or WRITE requests are outstanding, | |
221 | * the sending will be delayed. | |
222 | */ | |
223 | fuse_file_put(ff); | |
b6aeaded MS |
224 | } |
225 | ||
04730fef MS |
226 | static int fuse_open(struct inode *inode, struct file *file) |
227 | { | |
91fe96b4 | 228 | return fuse_open_common(inode, file, false); |
04730fef MS |
229 | } |
230 | ||
231 | static int fuse_release(struct inode *inode, struct file *file) | |
232 | { | |
8b0797a4 MS |
233 | fuse_release_common(file, FUSE_RELEASE); |
234 | ||
235 | /* return value is ignored by VFS */ | |
236 | return 0; | |
237 | } | |
238 | ||
239 | void fuse_sync_release(struct fuse_file *ff, int flags) | |
240 | { | |
241 | WARN_ON(atomic_read(&ff->count) > 1); | |
242 | fuse_prepare_release(ff, flags, FUSE_RELEASE); | |
243 | ff->reserved_req->force = 1; | |
244 | fuse_request_send(ff->fc, ff->reserved_req); | |
245 | fuse_put_request(ff->fc, ff->reserved_req); | |
246 | kfree(ff); | |
04730fef | 247 | } |
08cbf542 | 248 | EXPORT_SYMBOL_GPL(fuse_sync_release); |
04730fef | 249 | |
71421259 | 250 | /* |
9c8ef561 MS |
251 | * Scramble the ID space with XTEA, so that the value of the files_struct |
252 | * pointer is not exposed to userspace. | |
71421259 | 253 | */ |
f3332114 | 254 | u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id) |
71421259 | 255 | { |
9c8ef561 MS |
256 | u32 *k = fc->scramble_key; |
257 | u64 v = (unsigned long) id; | |
258 | u32 v0 = v; | |
259 | u32 v1 = v >> 32; | |
260 | u32 sum = 0; | |
261 | int i; | |
262 | ||
263 | for (i = 0; i < 32; i++) { | |
264 | v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]); | |
265 | sum += 0x9E3779B9; | |
266 | v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]); | |
267 | } | |
268 | ||
269 | return (u64) v0 + ((u64) v1 << 32); | |
71421259 MS |
270 | } |
271 | ||
3be5a52b MS |
272 | /* |
273 | * Check if page is under writeback | |
274 | * | |
275 | * This is currently done by walking the list of writepage requests | |
276 | * for the inode, which can be pretty inefficient. | |
277 | */ | |
278 | static bool fuse_page_is_writeback(struct inode *inode, pgoff_t index) | |
279 | { | |
280 | struct fuse_conn *fc = get_fuse_conn(inode); | |
281 | struct fuse_inode *fi = get_fuse_inode(inode); | |
282 | struct fuse_req *req; | |
283 | bool found = false; | |
284 | ||
285 | spin_lock(&fc->lock); | |
286 | list_for_each_entry(req, &fi->writepages, writepages_entry) { | |
287 | pgoff_t curr_index; | |
288 | ||
289 | BUG_ON(req->inode != inode); | |
290 | curr_index = req->misc.write.in.offset >> PAGE_CACHE_SHIFT; | |
291 | if (curr_index == index) { | |
292 | found = true; | |
293 | break; | |
294 | } | |
295 | } | |
296 | spin_unlock(&fc->lock); | |
297 | ||
298 | return found; | |
299 | } | |
300 | ||
301 | /* | |
302 | * Wait for page writeback to be completed. | |
303 | * | |
304 | * Since fuse doesn't rely on the VM writeback tracking, this has to | |
305 | * use some other means. | |
306 | */ | |
307 | static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index) | |
308 | { | |
309 | struct fuse_inode *fi = get_fuse_inode(inode); | |
310 | ||
311 | wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index)); | |
312 | return 0; | |
313 | } | |
314 | ||
75e1fcc0 | 315 | static int fuse_flush(struct file *file, fl_owner_t id) |
b6aeaded | 316 | { |
7706a9d6 | 317 | struct inode *inode = file->f_path.dentry->d_inode; |
b6aeaded MS |
318 | struct fuse_conn *fc = get_fuse_conn(inode); |
319 | struct fuse_file *ff = file->private_data; | |
320 | struct fuse_req *req; | |
321 | struct fuse_flush_in inarg; | |
322 | int err; | |
323 | ||
248d86e8 MS |
324 | if (is_bad_inode(inode)) |
325 | return -EIO; | |
326 | ||
b6aeaded MS |
327 | if (fc->no_flush) |
328 | return 0; | |
329 | ||
33649c91 | 330 | req = fuse_get_req_nofail(fc, file); |
b6aeaded MS |
331 | memset(&inarg, 0, sizeof(inarg)); |
332 | inarg.fh = ff->fh; | |
9c8ef561 | 333 | inarg.lock_owner = fuse_lock_owner_id(fc, id); |
b6aeaded MS |
334 | req->in.h.opcode = FUSE_FLUSH; |
335 | req->in.h.nodeid = get_node_id(inode); | |
b6aeaded MS |
336 | req->in.numargs = 1; |
337 | req->in.args[0].size = sizeof(inarg); | |
338 | req->in.args[0].value = &inarg; | |
71421259 | 339 | req->force = 1; |
b93f858a | 340 | fuse_request_send(fc, req); |
b6aeaded MS |
341 | err = req->out.h.error; |
342 | fuse_put_request(fc, req); | |
343 | if (err == -ENOSYS) { | |
344 | fc->no_flush = 1; | |
345 | err = 0; | |
346 | } | |
347 | return err; | |
348 | } | |
349 | ||
3be5a52b MS |
350 | /* |
351 | * Wait for all pending writepages on the inode to finish. | |
352 | * | |
353 | * This is currently done by blocking further writes with FUSE_NOWRITE | |
354 | * and waiting for all sent writes to complete. | |
355 | * | |
356 | * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage | |
357 | * could conflict with truncation. | |
358 | */ | |
359 | static void fuse_sync_writes(struct inode *inode) | |
360 | { | |
361 | fuse_set_nowrite(inode); | |
362 | fuse_release_nowrite(inode); | |
363 | } | |
364 | ||
7ea80859 | 365 | int fuse_fsync_common(struct file *file, int datasync, int isdir) |
b6aeaded | 366 | { |
7ea80859 | 367 | struct inode *inode = file->f_mapping->host; |
b6aeaded MS |
368 | struct fuse_conn *fc = get_fuse_conn(inode); |
369 | struct fuse_file *ff = file->private_data; | |
370 | struct fuse_req *req; | |
371 | struct fuse_fsync_in inarg; | |
372 | int err; | |
373 | ||
248d86e8 MS |
374 | if (is_bad_inode(inode)) |
375 | return -EIO; | |
376 | ||
82547981 | 377 | if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir)) |
b6aeaded MS |
378 | return 0; |
379 | ||
3be5a52b MS |
380 | /* |
381 | * Start writeback against all dirty pages of the inode, then | |
382 | * wait for all outstanding writes, before sending the FSYNC | |
383 | * request. | |
384 | */ | |
385 | err = write_inode_now(inode, 0); | |
386 | if (err) | |
387 | return err; | |
388 | ||
389 | fuse_sync_writes(inode); | |
390 | ||
ce1d5a49 MS |
391 | req = fuse_get_req(fc); |
392 | if (IS_ERR(req)) | |
393 | return PTR_ERR(req); | |
b6aeaded MS |
394 | |
395 | memset(&inarg, 0, sizeof(inarg)); | |
396 | inarg.fh = ff->fh; | |
397 | inarg.fsync_flags = datasync ? 1 : 0; | |
82547981 | 398 | req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC; |
b6aeaded | 399 | req->in.h.nodeid = get_node_id(inode); |
b6aeaded MS |
400 | req->in.numargs = 1; |
401 | req->in.args[0].size = sizeof(inarg); | |
402 | req->in.args[0].value = &inarg; | |
b93f858a | 403 | fuse_request_send(fc, req); |
b6aeaded MS |
404 | err = req->out.h.error; |
405 | fuse_put_request(fc, req); | |
406 | if (err == -ENOSYS) { | |
82547981 MS |
407 | if (isdir) |
408 | fc->no_fsyncdir = 1; | |
409 | else | |
410 | fc->no_fsync = 1; | |
b6aeaded MS |
411 | err = 0; |
412 | } | |
413 | return err; | |
414 | } | |
415 | ||
7ea80859 | 416 | static int fuse_fsync(struct file *file, int datasync) |
82547981 | 417 | { |
7ea80859 | 418 | return fuse_fsync_common(file, datasync, 0); |
82547981 MS |
419 | } |
420 | ||
2106cb18 MS |
421 | void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos, |
422 | size_t count, int opcode) | |
b6aeaded | 423 | { |
5c5c5e51 | 424 | struct fuse_read_in *inarg = &req->misc.read.in; |
a6643094 | 425 | struct fuse_file *ff = file->private_data; |
b6aeaded | 426 | |
361b1eb5 MS |
427 | inarg->fh = ff->fh; |
428 | inarg->offset = pos; | |
429 | inarg->size = count; | |
a6643094 | 430 | inarg->flags = file->f_flags; |
361b1eb5 | 431 | req->in.h.opcode = opcode; |
2106cb18 | 432 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
433 | req->in.numargs = 1; |
434 | req->in.args[0].size = sizeof(struct fuse_read_in); | |
c1aa96a5 | 435 | req->in.args[0].value = inarg; |
b6aeaded MS |
436 | req->out.argvar = 1; |
437 | req->out.numargs = 1; | |
438 | req->out.args[0].size = count; | |
b6aeaded MS |
439 | } |
440 | ||
8bfc016d | 441 | static size_t fuse_send_read(struct fuse_req *req, struct file *file, |
2106cb18 | 442 | loff_t pos, size_t count, fl_owner_t owner) |
04730fef | 443 | { |
2106cb18 MS |
444 | struct fuse_file *ff = file->private_data; |
445 | struct fuse_conn *fc = ff->fc; | |
f3332114 | 446 | |
2106cb18 | 447 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
f3332114 | 448 | if (owner != NULL) { |
5c5c5e51 | 449 | struct fuse_read_in *inarg = &req->misc.read.in; |
f3332114 MS |
450 | |
451 | inarg->read_flags |= FUSE_READ_LOCKOWNER; | |
452 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
453 | } | |
b93f858a | 454 | fuse_request_send(fc, req); |
361b1eb5 | 455 | return req->out.args[0].size; |
04730fef MS |
456 | } |
457 | ||
5c5c5e51 MS |
458 | static void fuse_read_update_size(struct inode *inode, loff_t size, |
459 | u64 attr_ver) | |
460 | { | |
461 | struct fuse_conn *fc = get_fuse_conn(inode); | |
462 | struct fuse_inode *fi = get_fuse_inode(inode); | |
463 | ||
464 | spin_lock(&fc->lock); | |
465 | if (attr_ver == fi->attr_version && size < inode->i_size) { | |
466 | fi->attr_version = ++fc->attr_version; | |
467 | i_size_write(inode, size); | |
468 | } | |
469 | spin_unlock(&fc->lock); | |
470 | } | |
471 | ||
b6aeaded MS |
472 | static int fuse_readpage(struct file *file, struct page *page) |
473 | { | |
474 | struct inode *inode = page->mapping->host; | |
475 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 | 476 | struct fuse_req *req; |
5c5c5e51 MS |
477 | size_t num_read; |
478 | loff_t pos = page_offset(page); | |
479 | size_t count = PAGE_CACHE_SIZE; | |
480 | u64 attr_ver; | |
248d86e8 MS |
481 | int err; |
482 | ||
483 | err = -EIO; | |
484 | if (is_bad_inode(inode)) | |
485 | goto out; | |
486 | ||
3be5a52b MS |
487 | /* |
488 | * Page writeback can extend beyond the liftime of the | |
489 | * page-cache page, so make sure we read a properly synced | |
490 | * page. | |
491 | */ | |
492 | fuse_wait_on_page_writeback(inode, page->index); | |
493 | ||
ce1d5a49 MS |
494 | req = fuse_get_req(fc); |
495 | err = PTR_ERR(req); | |
496 | if (IS_ERR(req)) | |
b6aeaded MS |
497 | goto out; |
498 | ||
5c5c5e51 MS |
499 | attr_ver = fuse_get_attr_version(fc); |
500 | ||
b6aeaded | 501 | req->out.page_zeroing = 1; |
f4975c67 | 502 | req->out.argpages = 1; |
b6aeaded MS |
503 | req->num_pages = 1; |
504 | req->pages[0] = page; | |
2106cb18 | 505 | num_read = fuse_send_read(req, file, pos, count, NULL); |
b6aeaded MS |
506 | err = req->out.h.error; |
507 | fuse_put_request(fc, req); | |
5c5c5e51 MS |
508 | |
509 | if (!err) { | |
510 | /* | |
511 | * Short read means EOF. If file size is larger, truncate it | |
512 | */ | |
513 | if (num_read < count) | |
514 | fuse_read_update_size(inode, pos + num_read, attr_ver); | |
515 | ||
b6aeaded | 516 | SetPageUptodate(page); |
5c5c5e51 MS |
517 | } |
518 | ||
b36c31ba | 519 | fuse_invalidate_attr(inode); /* atime changed */ |
b6aeaded MS |
520 | out: |
521 | unlock_page(page); | |
522 | return err; | |
523 | } | |
524 | ||
c1aa96a5 | 525 | static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req) |
db50b96c | 526 | { |
c1aa96a5 | 527 | int i; |
5c5c5e51 MS |
528 | size_t count = req->misc.read.in.size; |
529 | size_t num_read = req->out.args[0].size; | |
ce534fb0 | 530 | struct address_space *mapping = NULL; |
c1aa96a5 | 531 | |
ce534fb0 MS |
532 | for (i = 0; mapping == NULL && i < req->num_pages; i++) |
533 | mapping = req->pages[i]->mapping; | |
5c5c5e51 | 534 | |
ce534fb0 MS |
535 | if (mapping) { |
536 | struct inode *inode = mapping->host; | |
537 | ||
538 | /* | |
539 | * Short read means EOF. If file size is larger, truncate it | |
540 | */ | |
541 | if (!req->out.h.error && num_read < count) { | |
542 | loff_t pos; | |
543 | ||
544 | pos = page_offset(req->pages[0]) + num_read; | |
545 | fuse_read_update_size(inode, pos, | |
546 | req->misc.read.attr_ver); | |
547 | } | |
548 | fuse_invalidate_attr(inode); /* atime changed */ | |
549 | } | |
c1aa96a5 | 550 | |
db50b96c MS |
551 | for (i = 0; i < req->num_pages; i++) { |
552 | struct page *page = req->pages[i]; | |
553 | if (!req->out.h.error) | |
554 | SetPageUptodate(page); | |
c1aa96a5 MS |
555 | else |
556 | SetPageError(page); | |
db50b96c | 557 | unlock_page(page); |
b5dd3285 | 558 | page_cache_release(page); |
db50b96c | 559 | } |
c756e0a4 MS |
560 | if (req->ff) |
561 | fuse_file_put(req->ff); | |
c1aa96a5 MS |
562 | } |
563 | ||
2106cb18 | 564 | static void fuse_send_readpages(struct fuse_req *req, struct file *file) |
c1aa96a5 | 565 | { |
2106cb18 MS |
566 | struct fuse_file *ff = file->private_data; |
567 | struct fuse_conn *fc = ff->fc; | |
c1aa96a5 MS |
568 | loff_t pos = page_offset(req->pages[0]); |
569 | size_t count = req->num_pages << PAGE_CACHE_SHIFT; | |
f4975c67 MS |
570 | |
571 | req->out.argpages = 1; | |
c1aa96a5 | 572 | req->out.page_zeroing = 1; |
ce534fb0 | 573 | req->out.page_replace = 1; |
2106cb18 | 574 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
5c5c5e51 | 575 | req->misc.read.attr_ver = fuse_get_attr_version(fc); |
9cd68455 | 576 | if (fc->async_read) { |
c756e0a4 | 577 | req->ff = fuse_file_get(ff); |
9cd68455 | 578 | req->end = fuse_readpages_end; |
b93f858a | 579 | fuse_request_send_background(fc, req); |
9cd68455 | 580 | } else { |
b93f858a | 581 | fuse_request_send(fc, req); |
9cd68455 | 582 | fuse_readpages_end(fc, req); |
e9bb09dd | 583 | fuse_put_request(fc, req); |
9cd68455 | 584 | } |
db50b96c MS |
585 | } |
586 | ||
c756e0a4 | 587 | struct fuse_fill_data { |
db50b96c | 588 | struct fuse_req *req; |
a6643094 | 589 | struct file *file; |
db50b96c MS |
590 | struct inode *inode; |
591 | }; | |
592 | ||
593 | static int fuse_readpages_fill(void *_data, struct page *page) | |
594 | { | |
c756e0a4 | 595 | struct fuse_fill_data *data = _data; |
db50b96c MS |
596 | struct fuse_req *req = data->req; |
597 | struct inode *inode = data->inode; | |
598 | struct fuse_conn *fc = get_fuse_conn(inode); | |
599 | ||
3be5a52b MS |
600 | fuse_wait_on_page_writeback(inode, page->index); |
601 | ||
db50b96c MS |
602 | if (req->num_pages && |
603 | (req->num_pages == FUSE_MAX_PAGES_PER_REQ || | |
604 | (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read || | |
605 | req->pages[req->num_pages - 1]->index + 1 != page->index)) { | |
2106cb18 | 606 | fuse_send_readpages(req, data->file); |
ce1d5a49 MS |
607 | data->req = req = fuse_get_req(fc); |
608 | if (IS_ERR(req)) { | |
db50b96c | 609 | unlock_page(page); |
ce1d5a49 | 610 | return PTR_ERR(req); |
db50b96c | 611 | } |
db50b96c | 612 | } |
b5dd3285 | 613 | page_cache_get(page); |
db50b96c | 614 | req->pages[req->num_pages] = page; |
1729a16c | 615 | req->num_pages++; |
db50b96c MS |
616 | return 0; |
617 | } | |
618 | ||
619 | static int fuse_readpages(struct file *file, struct address_space *mapping, | |
620 | struct list_head *pages, unsigned nr_pages) | |
621 | { | |
622 | struct inode *inode = mapping->host; | |
623 | struct fuse_conn *fc = get_fuse_conn(inode); | |
c756e0a4 | 624 | struct fuse_fill_data data; |
db50b96c | 625 | int err; |
248d86e8 | 626 | |
1d7ea732 | 627 | err = -EIO; |
248d86e8 | 628 | if (is_bad_inode(inode)) |
2e990021 | 629 | goto out; |
248d86e8 | 630 | |
a6643094 | 631 | data.file = file; |
db50b96c | 632 | data.inode = inode; |
ce1d5a49 | 633 | data.req = fuse_get_req(fc); |
1d7ea732 | 634 | err = PTR_ERR(data.req); |
ce1d5a49 | 635 | if (IS_ERR(data.req)) |
2e990021 | 636 | goto out; |
db50b96c MS |
637 | |
638 | err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); | |
d3406ffa MS |
639 | if (!err) { |
640 | if (data.req->num_pages) | |
2106cb18 | 641 | fuse_send_readpages(data.req, file); |
d3406ffa MS |
642 | else |
643 | fuse_put_request(fc, data.req); | |
644 | } | |
2e990021 | 645 | out: |
1d7ea732 | 646 | return err; |
db50b96c MS |
647 | } |
648 | ||
bcb4be80 MS |
649 | static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov, |
650 | unsigned long nr_segs, loff_t pos) | |
651 | { | |
652 | struct inode *inode = iocb->ki_filp->f_mapping->host; | |
653 | ||
654 | if (pos + iov_length(iov, nr_segs) > i_size_read(inode)) { | |
655 | int err; | |
656 | /* | |
657 | * If trying to read past EOF, make sure the i_size | |
658 | * attribute is up-to-date. | |
659 | */ | |
660 | err = fuse_update_attributes(inode, NULL, iocb->ki_filp, NULL); | |
661 | if (err) | |
662 | return err; | |
663 | } | |
664 | ||
665 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
666 | } | |
667 | ||
2d698b07 | 668 | static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff, |
2106cb18 | 669 | loff_t pos, size_t count) |
b6aeaded | 670 | { |
b25e82e5 MS |
671 | struct fuse_write_in *inarg = &req->misc.write.in; |
672 | struct fuse_write_out *outarg = &req->misc.write.out; | |
b6aeaded | 673 | |
b25e82e5 MS |
674 | inarg->fh = ff->fh; |
675 | inarg->offset = pos; | |
676 | inarg->size = count; | |
b6aeaded | 677 | req->in.h.opcode = FUSE_WRITE; |
2106cb18 | 678 | req->in.h.nodeid = ff->nodeid; |
b6aeaded | 679 | req->in.numargs = 2; |
2106cb18 | 680 | if (ff->fc->minor < 9) |
f3332114 MS |
681 | req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE; |
682 | else | |
683 | req->in.args[0].size = sizeof(struct fuse_write_in); | |
b25e82e5 | 684 | req->in.args[0].value = inarg; |
b6aeaded MS |
685 | req->in.args[1].size = count; |
686 | req->out.numargs = 1; | |
687 | req->out.args[0].size = sizeof(struct fuse_write_out); | |
b25e82e5 MS |
688 | req->out.args[0].value = outarg; |
689 | } | |
690 | ||
691 | static size_t fuse_send_write(struct fuse_req *req, struct file *file, | |
2106cb18 | 692 | loff_t pos, size_t count, fl_owner_t owner) |
b25e82e5 | 693 | { |
2106cb18 MS |
694 | struct fuse_file *ff = file->private_data; |
695 | struct fuse_conn *fc = ff->fc; | |
2d698b07 MS |
696 | struct fuse_write_in *inarg = &req->misc.write.in; |
697 | ||
2106cb18 | 698 | fuse_write_fill(req, ff, pos, count); |
2d698b07 | 699 | inarg->flags = file->f_flags; |
f3332114 | 700 | if (owner != NULL) { |
f3332114 MS |
701 | inarg->write_flags |= FUSE_WRITE_LOCKOWNER; |
702 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
703 | } | |
b93f858a | 704 | fuse_request_send(fc, req); |
b25e82e5 | 705 | return req->misc.write.out.size; |
b6aeaded MS |
706 | } |
707 | ||
5e6f58a1 NP |
708 | static int fuse_write_begin(struct file *file, struct address_space *mapping, |
709 | loff_t pos, unsigned len, unsigned flags, | |
710 | struct page **pagep, void **fsdata) | |
b6aeaded | 711 | { |
5e6f58a1 NP |
712 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
713 | ||
54566b2c | 714 | *pagep = grab_cache_page_write_begin(mapping, index, flags); |
5e6f58a1 NP |
715 | if (!*pagep) |
716 | return -ENOMEM; | |
b6aeaded MS |
717 | return 0; |
718 | } | |
719 | ||
a1d75f25 | 720 | void fuse_write_update_size(struct inode *inode, loff_t pos) |
854512ec MS |
721 | { |
722 | struct fuse_conn *fc = get_fuse_conn(inode); | |
723 | struct fuse_inode *fi = get_fuse_inode(inode); | |
724 | ||
725 | spin_lock(&fc->lock); | |
726 | fi->attr_version = ++fc->attr_version; | |
727 | if (pos > inode->i_size) | |
728 | i_size_write(inode, pos); | |
729 | spin_unlock(&fc->lock); | |
730 | } | |
731 | ||
5e6f58a1 NP |
732 | static int fuse_buffered_write(struct file *file, struct inode *inode, |
733 | loff_t pos, unsigned count, struct page *page) | |
b6aeaded MS |
734 | { |
735 | int err; | |
04730fef | 736 | size_t nres; |
b6aeaded | 737 | struct fuse_conn *fc = get_fuse_conn(inode); |
5e6f58a1 | 738 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
248d86e8 MS |
739 | struct fuse_req *req; |
740 | ||
741 | if (is_bad_inode(inode)) | |
742 | return -EIO; | |
743 | ||
3be5a52b MS |
744 | /* |
745 | * Make sure writepages on the same page are not mixed up with | |
746 | * plain writes. | |
747 | */ | |
748 | fuse_wait_on_page_writeback(inode, page->index); | |
749 | ||
ce1d5a49 MS |
750 | req = fuse_get_req(fc); |
751 | if (IS_ERR(req)) | |
752 | return PTR_ERR(req); | |
b6aeaded | 753 | |
f4975c67 | 754 | req->in.argpages = 1; |
b6aeaded MS |
755 | req->num_pages = 1; |
756 | req->pages[0] = page; | |
757 | req->page_offset = offset; | |
2106cb18 | 758 | nres = fuse_send_write(req, file, pos, count, NULL); |
b6aeaded MS |
759 | err = req->out.h.error; |
760 | fuse_put_request(fc, req); | |
5e6f58a1 | 761 | if (!err && !nres) |
b6aeaded MS |
762 | err = -EIO; |
763 | if (!err) { | |
5e6f58a1 | 764 | pos += nres; |
854512ec | 765 | fuse_write_update_size(inode, pos); |
5e6f58a1 | 766 | if (count == PAGE_CACHE_SIZE) |
b6aeaded | 767 | SetPageUptodate(page); |
b36c31ba MS |
768 | } |
769 | fuse_invalidate_attr(inode); | |
5e6f58a1 NP |
770 | return err ? err : nres; |
771 | } | |
772 | ||
773 | static int fuse_write_end(struct file *file, struct address_space *mapping, | |
774 | loff_t pos, unsigned len, unsigned copied, | |
775 | struct page *page, void *fsdata) | |
776 | { | |
777 | struct inode *inode = mapping->host; | |
778 | int res = 0; | |
779 | ||
780 | if (copied) | |
781 | res = fuse_buffered_write(file, inode, pos, copied, page); | |
782 | ||
783 | unlock_page(page); | |
784 | page_cache_release(page); | |
785 | return res; | |
b6aeaded MS |
786 | } |
787 | ||
ea9b9907 NP |
788 | static size_t fuse_send_write_pages(struct fuse_req *req, struct file *file, |
789 | struct inode *inode, loff_t pos, | |
790 | size_t count) | |
791 | { | |
792 | size_t res; | |
793 | unsigned offset; | |
794 | unsigned i; | |
795 | ||
796 | for (i = 0; i < req->num_pages; i++) | |
797 | fuse_wait_on_page_writeback(inode, req->pages[i]->index); | |
798 | ||
2106cb18 | 799 | res = fuse_send_write(req, file, pos, count, NULL); |
ea9b9907 NP |
800 | |
801 | offset = req->page_offset; | |
802 | count = res; | |
803 | for (i = 0; i < req->num_pages; i++) { | |
804 | struct page *page = req->pages[i]; | |
805 | ||
806 | if (!req->out.h.error && !offset && count >= PAGE_CACHE_SIZE) | |
807 | SetPageUptodate(page); | |
808 | ||
809 | if (count > PAGE_CACHE_SIZE - offset) | |
810 | count -= PAGE_CACHE_SIZE - offset; | |
811 | else | |
812 | count = 0; | |
813 | offset = 0; | |
814 | ||
815 | unlock_page(page); | |
816 | page_cache_release(page); | |
817 | } | |
818 | ||
819 | return res; | |
820 | } | |
821 | ||
822 | static ssize_t fuse_fill_write_pages(struct fuse_req *req, | |
823 | struct address_space *mapping, | |
824 | struct iov_iter *ii, loff_t pos) | |
825 | { | |
826 | struct fuse_conn *fc = get_fuse_conn(mapping->host); | |
827 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
828 | size_t count = 0; | |
829 | int err; | |
830 | ||
f4975c67 | 831 | req->in.argpages = 1; |
ea9b9907 NP |
832 | req->page_offset = offset; |
833 | ||
834 | do { | |
835 | size_t tmp; | |
836 | struct page *page; | |
837 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; | |
838 | size_t bytes = min_t(size_t, PAGE_CACHE_SIZE - offset, | |
839 | iov_iter_count(ii)); | |
840 | ||
841 | bytes = min_t(size_t, bytes, fc->max_write - count); | |
842 | ||
843 | again: | |
844 | err = -EFAULT; | |
845 | if (iov_iter_fault_in_readable(ii, bytes)) | |
846 | break; | |
847 | ||
848 | err = -ENOMEM; | |
54566b2c | 849 | page = grab_cache_page_write_begin(mapping, index, 0); |
ea9b9907 NP |
850 | if (!page) |
851 | break; | |
852 | ||
931e80e4 | 853 | if (mapping_writably_mapped(mapping)) |
854 | flush_dcache_page(page); | |
855 | ||
ea9b9907 NP |
856 | pagefault_disable(); |
857 | tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes); | |
858 | pagefault_enable(); | |
859 | flush_dcache_page(page); | |
860 | ||
861 | if (!tmp) { | |
862 | unlock_page(page); | |
863 | page_cache_release(page); | |
864 | bytes = min(bytes, iov_iter_single_seg_count(ii)); | |
865 | goto again; | |
866 | } | |
867 | ||
868 | err = 0; | |
869 | req->pages[req->num_pages] = page; | |
870 | req->num_pages++; | |
871 | ||
872 | iov_iter_advance(ii, tmp); | |
873 | count += tmp; | |
874 | pos += tmp; | |
875 | offset += tmp; | |
876 | if (offset == PAGE_CACHE_SIZE) | |
877 | offset = 0; | |
878 | ||
78bb6cb9 MS |
879 | if (!fc->big_writes) |
880 | break; | |
ea9b9907 NP |
881 | } while (iov_iter_count(ii) && count < fc->max_write && |
882 | req->num_pages < FUSE_MAX_PAGES_PER_REQ && offset == 0); | |
883 | ||
884 | return count > 0 ? count : err; | |
885 | } | |
886 | ||
887 | static ssize_t fuse_perform_write(struct file *file, | |
888 | struct address_space *mapping, | |
889 | struct iov_iter *ii, loff_t pos) | |
890 | { | |
891 | struct inode *inode = mapping->host; | |
892 | struct fuse_conn *fc = get_fuse_conn(inode); | |
893 | int err = 0; | |
894 | ssize_t res = 0; | |
895 | ||
896 | if (is_bad_inode(inode)) | |
897 | return -EIO; | |
898 | ||
899 | do { | |
900 | struct fuse_req *req; | |
901 | ssize_t count; | |
902 | ||
903 | req = fuse_get_req(fc); | |
904 | if (IS_ERR(req)) { | |
905 | err = PTR_ERR(req); | |
906 | break; | |
907 | } | |
908 | ||
909 | count = fuse_fill_write_pages(req, mapping, ii, pos); | |
910 | if (count <= 0) { | |
911 | err = count; | |
912 | } else { | |
913 | size_t num_written; | |
914 | ||
915 | num_written = fuse_send_write_pages(req, file, inode, | |
916 | pos, count); | |
917 | err = req->out.h.error; | |
918 | if (!err) { | |
919 | res += num_written; | |
920 | pos += num_written; | |
921 | ||
922 | /* break out of the loop on short write */ | |
923 | if (num_written != count) | |
924 | err = -EIO; | |
925 | } | |
926 | } | |
927 | fuse_put_request(fc, req); | |
928 | } while (!err && iov_iter_count(ii)); | |
929 | ||
930 | if (res > 0) | |
931 | fuse_write_update_size(inode, pos); | |
932 | ||
933 | fuse_invalidate_attr(inode); | |
934 | ||
935 | return res > 0 ? res : err; | |
936 | } | |
937 | ||
938 | static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
939 | unsigned long nr_segs, loff_t pos) | |
940 | { | |
941 | struct file *file = iocb->ki_filp; | |
942 | struct address_space *mapping = file->f_mapping; | |
943 | size_t count = 0; | |
944 | ssize_t written = 0; | |
945 | struct inode *inode = mapping->host; | |
946 | ssize_t err; | |
947 | struct iov_iter i; | |
948 | ||
949 | WARN_ON(iocb->ki_pos != pos); | |
950 | ||
951 | err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ); | |
952 | if (err) | |
953 | return err; | |
954 | ||
955 | mutex_lock(&inode->i_mutex); | |
956 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); | |
957 | ||
958 | /* We can write back this queue in page reclaim */ | |
959 | current->backing_dev_info = mapping->backing_dev_info; | |
960 | ||
961 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
962 | if (err) | |
963 | goto out; | |
964 | ||
965 | if (count == 0) | |
966 | goto out; | |
967 | ||
2f1936b8 | 968 | err = file_remove_suid(file); |
ea9b9907 NP |
969 | if (err) |
970 | goto out; | |
971 | ||
972 | file_update_time(file); | |
973 | ||
974 | iov_iter_init(&i, iov, nr_segs, count, 0); | |
975 | written = fuse_perform_write(file, mapping, &i, pos); | |
976 | if (written >= 0) | |
977 | iocb->ki_pos = pos + written; | |
978 | ||
979 | out: | |
980 | current->backing_dev_info = NULL; | |
981 | mutex_unlock(&inode->i_mutex); | |
982 | ||
983 | return written ? written : err; | |
984 | } | |
985 | ||
413ef8cb MS |
986 | static void fuse_release_user_pages(struct fuse_req *req, int write) |
987 | { | |
988 | unsigned i; | |
989 | ||
990 | for (i = 0; i < req->num_pages; i++) { | |
991 | struct page *page = req->pages[i]; | |
992 | if (write) | |
993 | set_page_dirty_lock(page); | |
994 | put_page(page); | |
995 | } | |
996 | } | |
997 | ||
998 | static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf, | |
ce60a2f1 | 999 | size_t *nbytesp, int write) |
413ef8cb | 1000 | { |
ce60a2f1 | 1001 | size_t nbytes = *nbytesp; |
413ef8cb MS |
1002 | unsigned long user_addr = (unsigned long) buf; |
1003 | unsigned offset = user_addr & ~PAGE_MASK; | |
1004 | int npages; | |
1005 | ||
f4975c67 MS |
1006 | /* Special case for kernel I/O: can copy directly into the buffer */ |
1007 | if (segment_eq(get_fs(), KERNEL_DS)) { | |
1008 | if (write) | |
1009 | req->in.args[1].value = (void *) user_addr; | |
1010 | else | |
1011 | req->out.args[0].value = (void *) user_addr; | |
1012 | ||
1013 | return 0; | |
1014 | } | |
413ef8cb | 1015 | |
ce60a2f1 | 1016 | nbytes = min_t(size_t, nbytes, FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT); |
413ef8cb | 1017 | npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; |
bd730967 | 1018 | npages = clamp(npages, 1, FUSE_MAX_PAGES_PER_REQ); |
1bf94ca7 | 1019 | npages = get_user_pages_fast(user_addr, npages, !write, req->pages); |
413ef8cb MS |
1020 | if (npages < 0) |
1021 | return npages; | |
1022 | ||
1023 | req->num_pages = npages; | |
1024 | req->page_offset = offset; | |
f4975c67 MS |
1025 | |
1026 | if (write) | |
1027 | req->in.argpages = 1; | |
1028 | else | |
1029 | req->out.argpages = 1; | |
1030 | ||
1031 | nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset; | |
1032 | *nbytesp = min(*nbytesp, nbytes); | |
1033 | ||
413ef8cb MS |
1034 | return 0; |
1035 | } | |
1036 | ||
08cbf542 TH |
1037 | ssize_t fuse_direct_io(struct file *file, const char __user *buf, |
1038 | size_t count, loff_t *ppos, int write) | |
413ef8cb | 1039 | { |
2106cb18 MS |
1040 | struct fuse_file *ff = file->private_data; |
1041 | struct fuse_conn *fc = ff->fc; | |
413ef8cb MS |
1042 | size_t nmax = write ? fc->max_write : fc->max_read; |
1043 | loff_t pos = *ppos; | |
1044 | ssize_t res = 0; | |
248d86e8 MS |
1045 | struct fuse_req *req; |
1046 | ||
ce1d5a49 MS |
1047 | req = fuse_get_req(fc); |
1048 | if (IS_ERR(req)) | |
1049 | return PTR_ERR(req); | |
413ef8cb MS |
1050 | |
1051 | while (count) { | |
413ef8cb | 1052 | size_t nres; |
2106cb18 | 1053 | fl_owner_t owner = current->files; |
f4975c67 MS |
1054 | size_t nbytes = min(count, nmax); |
1055 | int err = fuse_get_user_pages(req, buf, &nbytes, write); | |
413ef8cb MS |
1056 | if (err) { |
1057 | res = err; | |
1058 | break; | |
1059 | } | |
f4975c67 | 1060 | |
413ef8cb | 1061 | if (write) |
2106cb18 | 1062 | nres = fuse_send_write(req, file, pos, nbytes, owner); |
413ef8cb | 1063 | else |
2106cb18 MS |
1064 | nres = fuse_send_read(req, file, pos, nbytes, owner); |
1065 | ||
413ef8cb MS |
1066 | fuse_release_user_pages(req, !write); |
1067 | if (req->out.h.error) { | |
1068 | if (!res) | |
1069 | res = req->out.h.error; | |
1070 | break; | |
1071 | } else if (nres > nbytes) { | |
1072 | res = -EIO; | |
1073 | break; | |
1074 | } | |
1075 | count -= nres; | |
1076 | res += nres; | |
1077 | pos += nres; | |
1078 | buf += nres; | |
1079 | if (nres != nbytes) | |
1080 | break; | |
56cf34ff MS |
1081 | if (count) { |
1082 | fuse_put_request(fc, req); | |
1083 | req = fuse_get_req(fc); | |
1084 | if (IS_ERR(req)) | |
1085 | break; | |
1086 | } | |
413ef8cb | 1087 | } |
f60311d5 AA |
1088 | if (!IS_ERR(req)) |
1089 | fuse_put_request(fc, req); | |
d09cb9d7 | 1090 | if (res > 0) |
413ef8cb | 1091 | *ppos = pos; |
413ef8cb MS |
1092 | |
1093 | return res; | |
1094 | } | |
08cbf542 | 1095 | EXPORT_SYMBOL_GPL(fuse_direct_io); |
413ef8cb MS |
1096 | |
1097 | static ssize_t fuse_direct_read(struct file *file, char __user *buf, | |
1098 | size_t count, loff_t *ppos) | |
1099 | { | |
d09cb9d7 MS |
1100 | ssize_t res; |
1101 | struct inode *inode = file->f_path.dentry->d_inode; | |
1102 | ||
1103 | if (is_bad_inode(inode)) | |
1104 | return -EIO; | |
1105 | ||
1106 | res = fuse_direct_io(file, buf, count, ppos, 0); | |
1107 | ||
1108 | fuse_invalidate_attr(inode); | |
1109 | ||
1110 | return res; | |
413ef8cb MS |
1111 | } |
1112 | ||
1113 | static ssize_t fuse_direct_write(struct file *file, const char __user *buf, | |
1114 | size_t count, loff_t *ppos) | |
1115 | { | |
7706a9d6 | 1116 | struct inode *inode = file->f_path.dentry->d_inode; |
413ef8cb | 1117 | ssize_t res; |
d09cb9d7 MS |
1118 | |
1119 | if (is_bad_inode(inode)) | |
1120 | return -EIO; | |
1121 | ||
413ef8cb | 1122 | /* Don't allow parallel writes to the same file */ |
1b1dcc1b | 1123 | mutex_lock(&inode->i_mutex); |
889f7848 | 1124 | res = generic_write_checks(file, ppos, &count, 0); |
d09cb9d7 | 1125 | if (!res) { |
889f7848 | 1126 | res = fuse_direct_io(file, buf, count, ppos, 1); |
d09cb9d7 MS |
1127 | if (res > 0) |
1128 | fuse_write_update_size(inode, *ppos); | |
1129 | } | |
1b1dcc1b | 1130 | mutex_unlock(&inode->i_mutex); |
d09cb9d7 MS |
1131 | |
1132 | fuse_invalidate_attr(inode); | |
1133 | ||
413ef8cb MS |
1134 | return res; |
1135 | } | |
1136 | ||
3be5a52b | 1137 | static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req) |
b6aeaded | 1138 | { |
3be5a52b MS |
1139 | __free_page(req->pages[0]); |
1140 | fuse_file_put(req->ff); | |
3be5a52b MS |
1141 | } |
1142 | ||
1143 | static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req) | |
1144 | { | |
1145 | struct inode *inode = req->inode; | |
1146 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1147 | struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info; | |
1148 | ||
1149 | list_del(&req->writepages_entry); | |
1150 | dec_bdi_stat(bdi, BDI_WRITEBACK); | |
1151 | dec_zone_page_state(req->pages[0], NR_WRITEBACK_TEMP); | |
1152 | bdi_writeout_inc(bdi); | |
1153 | wake_up(&fi->page_waitq); | |
1154 | } | |
1155 | ||
1156 | /* Called under fc->lock, may release and reacquire it */ | |
1157 | static void fuse_send_writepage(struct fuse_conn *fc, struct fuse_req *req) | |
b9ca67b2 MS |
1158 | __releases(fc->lock) |
1159 | __acquires(fc->lock) | |
3be5a52b MS |
1160 | { |
1161 | struct fuse_inode *fi = get_fuse_inode(req->inode); | |
1162 | loff_t size = i_size_read(req->inode); | |
1163 | struct fuse_write_in *inarg = &req->misc.write.in; | |
1164 | ||
1165 | if (!fc->connected) | |
1166 | goto out_free; | |
1167 | ||
1168 | if (inarg->offset + PAGE_CACHE_SIZE <= size) { | |
1169 | inarg->size = PAGE_CACHE_SIZE; | |
1170 | } else if (inarg->offset < size) { | |
1171 | inarg->size = size & (PAGE_CACHE_SIZE - 1); | |
1172 | } else { | |
1173 | /* Got truncated off completely */ | |
1174 | goto out_free; | |
b6aeaded | 1175 | } |
3be5a52b MS |
1176 | |
1177 | req->in.args[1].size = inarg->size; | |
1178 | fi->writectr++; | |
b93f858a | 1179 | fuse_request_send_background_locked(fc, req); |
3be5a52b MS |
1180 | return; |
1181 | ||
1182 | out_free: | |
1183 | fuse_writepage_finish(fc, req); | |
1184 | spin_unlock(&fc->lock); | |
1185 | fuse_writepage_free(fc, req); | |
e9bb09dd | 1186 | fuse_put_request(fc, req); |
3be5a52b | 1187 | spin_lock(&fc->lock); |
b6aeaded MS |
1188 | } |
1189 | ||
3be5a52b MS |
1190 | /* |
1191 | * If fi->writectr is positive (no truncate or fsync going on) send | |
1192 | * all queued writepage requests. | |
1193 | * | |
1194 | * Called with fc->lock | |
1195 | */ | |
1196 | void fuse_flush_writepages(struct inode *inode) | |
b9ca67b2 MS |
1197 | __releases(fc->lock) |
1198 | __acquires(fc->lock) | |
b6aeaded | 1199 | { |
3be5a52b MS |
1200 | struct fuse_conn *fc = get_fuse_conn(inode); |
1201 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1202 | struct fuse_req *req; | |
1203 | ||
1204 | while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) { | |
1205 | req = list_entry(fi->queued_writes.next, struct fuse_req, list); | |
1206 | list_del_init(&req->list); | |
1207 | fuse_send_writepage(fc, req); | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req) | |
1212 | { | |
1213 | struct inode *inode = req->inode; | |
1214 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1215 | ||
1216 | mapping_set_error(inode->i_mapping, req->out.h.error); | |
1217 | spin_lock(&fc->lock); | |
1218 | fi->writectr--; | |
1219 | fuse_writepage_finish(fc, req); | |
1220 | spin_unlock(&fc->lock); | |
1221 | fuse_writepage_free(fc, req); | |
1222 | } | |
1223 | ||
1224 | static int fuse_writepage_locked(struct page *page) | |
1225 | { | |
1226 | struct address_space *mapping = page->mapping; | |
1227 | struct inode *inode = mapping->host; | |
1228 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1229 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1230 | struct fuse_req *req; | |
1231 | struct fuse_file *ff; | |
1232 | struct page *tmp_page; | |
1233 | ||
1234 | set_page_writeback(page); | |
1235 | ||
1236 | req = fuse_request_alloc_nofs(); | |
1237 | if (!req) | |
1238 | goto err; | |
1239 | ||
1240 | tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
1241 | if (!tmp_page) | |
1242 | goto err_free; | |
1243 | ||
1244 | spin_lock(&fc->lock); | |
1245 | BUG_ON(list_empty(&fi->write_files)); | |
1246 | ff = list_entry(fi->write_files.next, struct fuse_file, write_entry); | |
1247 | req->ff = fuse_file_get(ff); | |
1248 | spin_unlock(&fc->lock); | |
1249 | ||
2106cb18 | 1250 | fuse_write_fill(req, ff, page_offset(page), 0); |
3be5a52b MS |
1251 | |
1252 | copy_highpage(tmp_page, page); | |
2d698b07 | 1253 | req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; |
f4975c67 | 1254 | req->in.argpages = 1; |
3be5a52b MS |
1255 | req->num_pages = 1; |
1256 | req->pages[0] = tmp_page; | |
1257 | req->page_offset = 0; | |
1258 | req->end = fuse_writepage_end; | |
1259 | req->inode = inode; | |
1260 | ||
1261 | inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK); | |
1262 | inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP); | |
1263 | end_page_writeback(page); | |
1264 | ||
1265 | spin_lock(&fc->lock); | |
1266 | list_add(&req->writepages_entry, &fi->writepages); | |
1267 | list_add_tail(&req->list, &fi->queued_writes); | |
1268 | fuse_flush_writepages(inode); | |
1269 | spin_unlock(&fc->lock); | |
1270 | ||
1271 | return 0; | |
1272 | ||
1273 | err_free: | |
1274 | fuse_request_free(req); | |
1275 | err: | |
1276 | end_page_writeback(page); | |
1277 | return -ENOMEM; | |
1278 | } | |
1279 | ||
1280 | static int fuse_writepage(struct page *page, struct writeback_control *wbc) | |
1281 | { | |
1282 | int err; | |
1283 | ||
1284 | err = fuse_writepage_locked(page); | |
1285 | unlock_page(page); | |
1286 | ||
1287 | return err; | |
1288 | } | |
1289 | ||
1290 | static int fuse_launder_page(struct page *page) | |
1291 | { | |
1292 | int err = 0; | |
1293 | if (clear_page_dirty_for_io(page)) { | |
1294 | struct inode *inode = page->mapping->host; | |
1295 | err = fuse_writepage_locked(page); | |
1296 | if (!err) | |
1297 | fuse_wait_on_page_writeback(inode, page->index); | |
1298 | } | |
1299 | return err; | |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * Write back dirty pages now, because there may not be any suitable | |
1304 | * open files later | |
1305 | */ | |
1306 | static void fuse_vma_close(struct vm_area_struct *vma) | |
1307 | { | |
1308 | filemap_write_and_wait(vma->vm_file->f_mapping); | |
1309 | } | |
1310 | ||
1311 | /* | |
1312 | * Wait for writeback against this page to complete before allowing it | |
1313 | * to be marked dirty again, and hence written back again, possibly | |
1314 | * before the previous writepage completed. | |
1315 | * | |
1316 | * Block here, instead of in ->writepage(), so that the userspace fs | |
1317 | * can only block processes actually operating on the filesystem. | |
1318 | * | |
1319 | * Otherwise unprivileged userspace fs would be able to block | |
1320 | * unrelated: | |
1321 | * | |
1322 | * - page migration | |
1323 | * - sync(2) | |
1324 | * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER | |
1325 | */ | |
c2ec175c | 1326 | static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
3be5a52b | 1327 | { |
c2ec175c | 1328 | struct page *page = vmf->page; |
3be5a52b MS |
1329 | /* |
1330 | * Don't use page->mapping as it may become NULL from a | |
1331 | * concurrent truncate. | |
1332 | */ | |
1333 | struct inode *inode = vma->vm_file->f_mapping->host; | |
1334 | ||
1335 | fuse_wait_on_page_writeback(inode, page->index); | |
1336 | return 0; | |
1337 | } | |
1338 | ||
f0f37e2f | 1339 | static const struct vm_operations_struct fuse_file_vm_ops = { |
3be5a52b MS |
1340 | .close = fuse_vma_close, |
1341 | .fault = filemap_fault, | |
1342 | .page_mkwrite = fuse_page_mkwrite, | |
1343 | }; | |
1344 | ||
1345 | static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1346 | { | |
1347 | if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) { | |
1348 | struct inode *inode = file->f_dentry->d_inode; | |
1349 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1350 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1351 | struct fuse_file *ff = file->private_data; | |
1352 | /* | |
1353 | * file may be written through mmap, so chain it onto the | |
1354 | * inodes's write_file list | |
1355 | */ | |
1356 | spin_lock(&fc->lock); | |
1357 | if (list_empty(&ff->write_entry)) | |
1358 | list_add(&ff->write_entry, &fi->write_files); | |
1359 | spin_unlock(&fc->lock); | |
1360 | } | |
1361 | file_accessed(file); | |
1362 | vma->vm_ops = &fuse_file_vm_ops; | |
b6aeaded MS |
1363 | return 0; |
1364 | } | |
1365 | ||
fc280c96 MS |
1366 | static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma) |
1367 | { | |
1368 | /* Can't provide the coherency needed for MAP_SHARED */ | |
1369 | if (vma->vm_flags & VM_MAYSHARE) | |
1370 | return -ENODEV; | |
1371 | ||
3121bfe7 MS |
1372 | invalidate_inode_pages2(file->f_mapping); |
1373 | ||
fc280c96 MS |
1374 | return generic_file_mmap(file, vma); |
1375 | } | |
1376 | ||
71421259 MS |
1377 | static int convert_fuse_file_lock(const struct fuse_file_lock *ffl, |
1378 | struct file_lock *fl) | |
1379 | { | |
1380 | switch (ffl->type) { | |
1381 | case F_UNLCK: | |
1382 | break; | |
1383 | ||
1384 | case F_RDLCK: | |
1385 | case F_WRLCK: | |
1386 | if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX || | |
1387 | ffl->end < ffl->start) | |
1388 | return -EIO; | |
1389 | ||
1390 | fl->fl_start = ffl->start; | |
1391 | fl->fl_end = ffl->end; | |
1392 | fl->fl_pid = ffl->pid; | |
1393 | break; | |
1394 | ||
1395 | default: | |
1396 | return -EIO; | |
1397 | } | |
1398 | fl->fl_type = ffl->type; | |
1399 | return 0; | |
1400 | } | |
1401 | ||
1402 | static void fuse_lk_fill(struct fuse_req *req, struct file *file, | |
a9ff4f87 MS |
1403 | const struct file_lock *fl, int opcode, pid_t pid, |
1404 | int flock) | |
71421259 | 1405 | { |
7706a9d6 | 1406 | struct inode *inode = file->f_path.dentry->d_inode; |
9c8ef561 | 1407 | struct fuse_conn *fc = get_fuse_conn(inode); |
71421259 MS |
1408 | struct fuse_file *ff = file->private_data; |
1409 | struct fuse_lk_in *arg = &req->misc.lk_in; | |
1410 | ||
1411 | arg->fh = ff->fh; | |
9c8ef561 | 1412 | arg->owner = fuse_lock_owner_id(fc, fl->fl_owner); |
71421259 MS |
1413 | arg->lk.start = fl->fl_start; |
1414 | arg->lk.end = fl->fl_end; | |
1415 | arg->lk.type = fl->fl_type; | |
1416 | arg->lk.pid = pid; | |
a9ff4f87 MS |
1417 | if (flock) |
1418 | arg->lk_flags |= FUSE_LK_FLOCK; | |
71421259 MS |
1419 | req->in.h.opcode = opcode; |
1420 | req->in.h.nodeid = get_node_id(inode); | |
1421 | req->in.numargs = 1; | |
1422 | req->in.args[0].size = sizeof(*arg); | |
1423 | req->in.args[0].value = arg; | |
1424 | } | |
1425 | ||
1426 | static int fuse_getlk(struct file *file, struct file_lock *fl) | |
1427 | { | |
7706a9d6 | 1428 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1429 | struct fuse_conn *fc = get_fuse_conn(inode); |
1430 | struct fuse_req *req; | |
1431 | struct fuse_lk_out outarg; | |
1432 | int err; | |
1433 | ||
1434 | req = fuse_get_req(fc); | |
1435 | if (IS_ERR(req)) | |
1436 | return PTR_ERR(req); | |
1437 | ||
a9ff4f87 | 1438 | fuse_lk_fill(req, file, fl, FUSE_GETLK, 0, 0); |
71421259 MS |
1439 | req->out.numargs = 1; |
1440 | req->out.args[0].size = sizeof(outarg); | |
1441 | req->out.args[0].value = &outarg; | |
b93f858a | 1442 | fuse_request_send(fc, req); |
71421259 MS |
1443 | err = req->out.h.error; |
1444 | fuse_put_request(fc, req); | |
1445 | if (!err) | |
1446 | err = convert_fuse_file_lock(&outarg.lk, fl); | |
1447 | ||
1448 | return err; | |
1449 | } | |
1450 | ||
a9ff4f87 | 1451 | static int fuse_setlk(struct file *file, struct file_lock *fl, int flock) |
71421259 | 1452 | { |
7706a9d6 | 1453 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1454 | struct fuse_conn *fc = get_fuse_conn(inode); |
1455 | struct fuse_req *req; | |
1456 | int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK; | |
1457 | pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0; | |
1458 | int err; | |
1459 | ||
48e90761 MS |
1460 | if (fl->fl_lmops && fl->fl_lmops->fl_grant) { |
1461 | /* NLM needs asynchronous locks, which we don't support yet */ | |
1462 | return -ENOLCK; | |
1463 | } | |
1464 | ||
71421259 MS |
1465 | /* Unlock on close is handled by the flush method */ |
1466 | if (fl->fl_flags & FL_CLOSE) | |
1467 | return 0; | |
1468 | ||
1469 | req = fuse_get_req(fc); | |
1470 | if (IS_ERR(req)) | |
1471 | return PTR_ERR(req); | |
1472 | ||
a9ff4f87 | 1473 | fuse_lk_fill(req, file, fl, opcode, pid, flock); |
b93f858a | 1474 | fuse_request_send(fc, req); |
71421259 | 1475 | err = req->out.h.error; |
a4d27e75 MS |
1476 | /* locking is restartable */ |
1477 | if (err == -EINTR) | |
1478 | err = -ERESTARTSYS; | |
71421259 MS |
1479 | fuse_put_request(fc, req); |
1480 | return err; | |
1481 | } | |
1482 | ||
1483 | static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) | |
1484 | { | |
7706a9d6 | 1485 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1486 | struct fuse_conn *fc = get_fuse_conn(inode); |
1487 | int err; | |
1488 | ||
48e90761 MS |
1489 | if (cmd == F_CANCELLK) { |
1490 | err = 0; | |
1491 | } else if (cmd == F_GETLK) { | |
71421259 | 1492 | if (fc->no_lock) { |
9d6a8c5c | 1493 | posix_test_lock(file, fl); |
71421259 MS |
1494 | err = 0; |
1495 | } else | |
1496 | err = fuse_getlk(file, fl); | |
1497 | } else { | |
1498 | if (fc->no_lock) | |
48e90761 | 1499 | err = posix_lock_file(file, fl, NULL); |
71421259 | 1500 | else |
a9ff4f87 | 1501 | err = fuse_setlk(file, fl, 0); |
71421259 MS |
1502 | } |
1503 | return err; | |
1504 | } | |
1505 | ||
a9ff4f87 MS |
1506 | static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl) |
1507 | { | |
1508 | struct inode *inode = file->f_path.dentry->d_inode; | |
1509 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1510 | int err; | |
1511 | ||
1512 | if (fc->no_lock) { | |
1513 | err = flock_lock_file_wait(file, fl); | |
1514 | } else { | |
1515 | /* emulate flock with POSIX locks */ | |
1516 | fl->fl_owner = (fl_owner_t) file; | |
1517 | err = fuse_setlk(file, fl, 1); | |
1518 | } | |
1519 | ||
1520 | return err; | |
1521 | } | |
1522 | ||
b2d2272f MS |
1523 | static sector_t fuse_bmap(struct address_space *mapping, sector_t block) |
1524 | { | |
1525 | struct inode *inode = mapping->host; | |
1526 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1527 | struct fuse_req *req; | |
1528 | struct fuse_bmap_in inarg; | |
1529 | struct fuse_bmap_out outarg; | |
1530 | int err; | |
1531 | ||
1532 | if (!inode->i_sb->s_bdev || fc->no_bmap) | |
1533 | return 0; | |
1534 | ||
1535 | req = fuse_get_req(fc); | |
1536 | if (IS_ERR(req)) | |
1537 | return 0; | |
1538 | ||
1539 | memset(&inarg, 0, sizeof(inarg)); | |
1540 | inarg.block = block; | |
1541 | inarg.blocksize = inode->i_sb->s_blocksize; | |
1542 | req->in.h.opcode = FUSE_BMAP; | |
1543 | req->in.h.nodeid = get_node_id(inode); | |
1544 | req->in.numargs = 1; | |
1545 | req->in.args[0].size = sizeof(inarg); | |
1546 | req->in.args[0].value = &inarg; | |
1547 | req->out.numargs = 1; | |
1548 | req->out.args[0].size = sizeof(outarg); | |
1549 | req->out.args[0].value = &outarg; | |
b93f858a | 1550 | fuse_request_send(fc, req); |
b2d2272f MS |
1551 | err = req->out.h.error; |
1552 | fuse_put_request(fc, req); | |
1553 | if (err == -ENOSYS) | |
1554 | fc->no_bmap = 1; | |
1555 | ||
1556 | return err ? 0 : outarg.block; | |
1557 | } | |
1558 | ||
5559b8f4 MS |
1559 | static loff_t fuse_file_llseek(struct file *file, loff_t offset, int origin) |
1560 | { | |
1561 | loff_t retval; | |
1562 | struct inode *inode = file->f_path.dentry->d_inode; | |
1563 | ||
1564 | mutex_lock(&inode->i_mutex); | |
1565 | switch (origin) { | |
1566 | case SEEK_END: | |
769415c6 MS |
1567 | retval = fuse_update_attributes(inode, NULL, file, NULL); |
1568 | if (retval) | |
5291658d | 1569 | goto exit; |
5559b8f4 MS |
1570 | offset += i_size_read(inode); |
1571 | break; | |
1572 | case SEEK_CUR: | |
1573 | offset += file->f_pos; | |
1574 | } | |
1575 | retval = -EINVAL; | |
1576 | if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { | |
1577 | if (offset != file->f_pos) { | |
1578 | file->f_pos = offset; | |
1579 | file->f_version = 0; | |
1580 | } | |
1581 | retval = offset; | |
1582 | } | |
5291658d | 1583 | exit: |
5559b8f4 MS |
1584 | mutex_unlock(&inode->i_mutex); |
1585 | return retval; | |
1586 | } | |
1587 | ||
59efec7b TH |
1588 | static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov, |
1589 | unsigned int nr_segs, size_t bytes, bool to_user) | |
1590 | { | |
1591 | struct iov_iter ii; | |
1592 | int page_idx = 0; | |
1593 | ||
1594 | if (!bytes) | |
1595 | return 0; | |
1596 | ||
1597 | iov_iter_init(&ii, iov, nr_segs, bytes, 0); | |
1598 | ||
1599 | while (iov_iter_count(&ii)) { | |
1600 | struct page *page = pages[page_idx++]; | |
1601 | size_t todo = min_t(size_t, PAGE_SIZE, iov_iter_count(&ii)); | |
4aa0edd2 | 1602 | void *kaddr; |
59efec7b | 1603 | |
4aa0edd2 | 1604 | kaddr = kmap(page); |
59efec7b TH |
1605 | |
1606 | while (todo) { | |
1607 | char __user *uaddr = ii.iov->iov_base + ii.iov_offset; | |
1608 | size_t iov_len = ii.iov->iov_len - ii.iov_offset; | |
1609 | size_t copy = min(todo, iov_len); | |
1610 | size_t left; | |
1611 | ||
1612 | if (!to_user) | |
1613 | left = copy_from_user(kaddr, uaddr, copy); | |
1614 | else | |
1615 | left = copy_to_user(uaddr, kaddr, copy); | |
1616 | ||
1617 | if (unlikely(left)) | |
1618 | return -EFAULT; | |
1619 | ||
1620 | iov_iter_advance(&ii, copy); | |
1621 | todo -= copy; | |
1622 | kaddr += copy; | |
1623 | } | |
1624 | ||
0bd87182 | 1625 | kunmap(page); |
59efec7b TH |
1626 | } |
1627 | ||
1628 | return 0; | |
1629 | } | |
1630 | ||
d9d318d3 MS |
1631 | /* |
1632 | * CUSE servers compiled on 32bit broke on 64bit kernels because the | |
1633 | * ABI was defined to be 'struct iovec' which is different on 32bit | |
1634 | * and 64bit. Fortunately we can determine which structure the server | |
1635 | * used from the size of the reply. | |
1636 | */ | |
1637 | static int fuse_copy_ioctl_iovec(struct iovec *dst, void *src, | |
1638 | size_t transferred, unsigned count, | |
1639 | bool is_compat) | |
1640 | { | |
1641 | #ifdef CONFIG_COMPAT | |
1642 | if (count * sizeof(struct compat_iovec) == transferred) { | |
1643 | struct compat_iovec *ciov = src; | |
1644 | unsigned i; | |
1645 | ||
1646 | /* | |
1647 | * With this interface a 32bit server cannot support | |
1648 | * non-compat (i.e. ones coming from 64bit apps) ioctl | |
1649 | * requests | |
1650 | */ | |
1651 | if (!is_compat) | |
1652 | return -EINVAL; | |
1653 | ||
1654 | for (i = 0; i < count; i++) { | |
1655 | dst[i].iov_base = compat_ptr(ciov[i].iov_base); | |
1656 | dst[i].iov_len = ciov[i].iov_len; | |
1657 | } | |
1658 | return 0; | |
1659 | } | |
1660 | #endif | |
1661 | ||
1662 | if (count * sizeof(struct iovec) != transferred) | |
1663 | return -EIO; | |
1664 | ||
1665 | memcpy(dst, src, transferred); | |
1666 | return 0; | |
1667 | } | |
1668 | ||
7572777e MS |
1669 | /* Make sure iov_length() won't overflow */ |
1670 | static int fuse_verify_ioctl_iov(struct iovec *iov, size_t count) | |
1671 | { | |
1672 | size_t n; | |
1673 | u32 max = FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT; | |
1674 | ||
1675 | for (n = 0; n < count; n++) { | |
1676 | if (iov->iov_len > (size_t) max) | |
1677 | return -ENOMEM; | |
1678 | max -= iov->iov_len; | |
1679 | } | |
1680 | return 0; | |
1681 | } | |
1682 | ||
59efec7b TH |
1683 | /* |
1684 | * For ioctls, there is no generic way to determine how much memory | |
1685 | * needs to be read and/or written. Furthermore, ioctls are allowed | |
1686 | * to dereference the passed pointer, so the parameter requires deep | |
1687 | * copying but FUSE has no idea whatsoever about what to copy in or | |
1688 | * out. | |
1689 | * | |
1690 | * This is solved by allowing FUSE server to retry ioctl with | |
1691 | * necessary in/out iovecs. Let's assume the ioctl implementation | |
1692 | * needs to read in the following structure. | |
1693 | * | |
1694 | * struct a { | |
1695 | * char *buf; | |
1696 | * size_t buflen; | |
1697 | * } | |
1698 | * | |
1699 | * On the first callout to FUSE server, inarg->in_size and | |
1700 | * inarg->out_size will be NULL; then, the server completes the ioctl | |
1701 | * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and | |
1702 | * the actual iov array to | |
1703 | * | |
1704 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } } | |
1705 | * | |
1706 | * which tells FUSE to copy in the requested area and retry the ioctl. | |
1707 | * On the second round, the server has access to the structure and | |
1708 | * from that it can tell what to look for next, so on the invocation, | |
1709 | * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to | |
1710 | * | |
1711 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) }, | |
1712 | * { .iov_base = a.buf, .iov_len = a.buflen } } | |
1713 | * | |
1714 | * FUSE will copy both struct a and the pointed buffer from the | |
1715 | * process doing the ioctl and retry ioctl with both struct a and the | |
1716 | * buffer. | |
1717 | * | |
1718 | * This time, FUSE server has everything it needs and completes ioctl | |
1719 | * without FUSE_IOCTL_RETRY which finishes the ioctl call. | |
1720 | * | |
1721 | * Copying data out works the same way. | |
1722 | * | |
1723 | * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel | |
1724 | * automatically initializes in and out iovs by decoding @cmd with | |
1725 | * _IOC_* macros and the server is not allowed to request RETRY. This | |
1726 | * limits ioctl data transfers to well-formed ioctls and is the forced | |
1727 | * behavior for all FUSE servers. | |
1728 | */ | |
08cbf542 TH |
1729 | long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, |
1730 | unsigned int flags) | |
59efec7b | 1731 | { |
59efec7b | 1732 | struct fuse_file *ff = file->private_data; |
d36f2487 | 1733 | struct fuse_conn *fc = ff->fc; |
59efec7b TH |
1734 | struct fuse_ioctl_in inarg = { |
1735 | .fh = ff->fh, | |
1736 | .cmd = cmd, | |
1737 | .arg = arg, | |
1738 | .flags = flags | |
1739 | }; | |
1740 | struct fuse_ioctl_out outarg; | |
1741 | struct fuse_req *req = NULL; | |
1742 | struct page **pages = NULL; | |
1743 | struct page *iov_page = NULL; | |
1744 | struct iovec *in_iov = NULL, *out_iov = NULL; | |
1745 | unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages; | |
1746 | size_t in_size, out_size, transferred; | |
1747 | int err; | |
1748 | ||
1749 | /* assume all the iovs returned by client always fits in a page */ | |
1750 | BUILD_BUG_ON(sizeof(struct iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE); | |
1751 | ||
59efec7b TH |
1752 | err = -ENOMEM; |
1753 | pages = kzalloc(sizeof(pages[0]) * FUSE_MAX_PAGES_PER_REQ, GFP_KERNEL); | |
1754 | iov_page = alloc_page(GFP_KERNEL); | |
1755 | if (!pages || !iov_page) | |
1756 | goto out; | |
1757 | ||
1758 | /* | |
1759 | * If restricted, initialize IO parameters as encoded in @cmd. | |
1760 | * RETRY from server is not allowed. | |
1761 | */ | |
1762 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) { | |
1763 | struct iovec *iov = page_address(iov_page); | |
1764 | ||
c9f0523d | 1765 | iov->iov_base = (void __user *)arg; |
59efec7b TH |
1766 | iov->iov_len = _IOC_SIZE(cmd); |
1767 | ||
1768 | if (_IOC_DIR(cmd) & _IOC_WRITE) { | |
1769 | in_iov = iov; | |
1770 | in_iovs = 1; | |
1771 | } | |
1772 | ||
1773 | if (_IOC_DIR(cmd) & _IOC_READ) { | |
1774 | out_iov = iov; | |
1775 | out_iovs = 1; | |
1776 | } | |
1777 | } | |
1778 | ||
1779 | retry: | |
1780 | inarg.in_size = in_size = iov_length(in_iov, in_iovs); | |
1781 | inarg.out_size = out_size = iov_length(out_iov, out_iovs); | |
1782 | ||
1783 | /* | |
1784 | * Out data can be used either for actual out data or iovs, | |
1785 | * make sure there always is at least one page. | |
1786 | */ | |
1787 | out_size = max_t(size_t, out_size, PAGE_SIZE); | |
1788 | max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE); | |
1789 | ||
1790 | /* make sure there are enough buffer pages and init request with them */ | |
1791 | err = -ENOMEM; | |
1792 | if (max_pages > FUSE_MAX_PAGES_PER_REQ) | |
1793 | goto out; | |
1794 | while (num_pages < max_pages) { | |
1795 | pages[num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM); | |
1796 | if (!pages[num_pages]) | |
1797 | goto out; | |
1798 | num_pages++; | |
1799 | } | |
1800 | ||
1801 | req = fuse_get_req(fc); | |
1802 | if (IS_ERR(req)) { | |
1803 | err = PTR_ERR(req); | |
1804 | req = NULL; | |
1805 | goto out; | |
1806 | } | |
1807 | memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages); | |
1808 | req->num_pages = num_pages; | |
1809 | ||
1810 | /* okay, let's send it to the client */ | |
1811 | req->in.h.opcode = FUSE_IOCTL; | |
d36f2487 | 1812 | req->in.h.nodeid = ff->nodeid; |
59efec7b TH |
1813 | req->in.numargs = 1; |
1814 | req->in.args[0].size = sizeof(inarg); | |
1815 | req->in.args[0].value = &inarg; | |
1816 | if (in_size) { | |
1817 | req->in.numargs++; | |
1818 | req->in.args[1].size = in_size; | |
1819 | req->in.argpages = 1; | |
1820 | ||
1821 | err = fuse_ioctl_copy_user(pages, in_iov, in_iovs, in_size, | |
1822 | false); | |
1823 | if (err) | |
1824 | goto out; | |
1825 | } | |
1826 | ||
1827 | req->out.numargs = 2; | |
1828 | req->out.args[0].size = sizeof(outarg); | |
1829 | req->out.args[0].value = &outarg; | |
1830 | req->out.args[1].size = out_size; | |
1831 | req->out.argpages = 1; | |
1832 | req->out.argvar = 1; | |
1833 | ||
b93f858a | 1834 | fuse_request_send(fc, req); |
59efec7b TH |
1835 | err = req->out.h.error; |
1836 | transferred = req->out.args[1].size; | |
1837 | fuse_put_request(fc, req); | |
1838 | req = NULL; | |
1839 | if (err) | |
1840 | goto out; | |
1841 | ||
1842 | /* did it ask for retry? */ | |
1843 | if (outarg.flags & FUSE_IOCTL_RETRY) { | |
1844 | char *vaddr; | |
1845 | ||
1846 | /* no retry if in restricted mode */ | |
1847 | err = -EIO; | |
1848 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) | |
1849 | goto out; | |
1850 | ||
1851 | in_iovs = outarg.in_iovs; | |
1852 | out_iovs = outarg.out_iovs; | |
1853 | ||
1854 | /* | |
1855 | * Make sure things are in boundary, separate checks | |
1856 | * are to protect against overflow. | |
1857 | */ | |
1858 | err = -ENOMEM; | |
1859 | if (in_iovs > FUSE_IOCTL_MAX_IOV || | |
1860 | out_iovs > FUSE_IOCTL_MAX_IOV || | |
1861 | in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV) | |
1862 | goto out; | |
1863 | ||
59efec7b | 1864 | vaddr = kmap_atomic(pages[0], KM_USER0); |
d9d318d3 MS |
1865 | err = fuse_copy_ioctl_iovec(page_address(iov_page), vaddr, |
1866 | transferred, in_iovs + out_iovs, | |
1867 | (flags & FUSE_IOCTL_COMPAT) != 0); | |
59efec7b | 1868 | kunmap_atomic(vaddr, KM_USER0); |
d9d318d3 MS |
1869 | if (err) |
1870 | goto out; | |
59efec7b TH |
1871 | |
1872 | in_iov = page_address(iov_page); | |
1873 | out_iov = in_iov + in_iovs; | |
1874 | ||
7572777e MS |
1875 | err = fuse_verify_ioctl_iov(in_iov, in_iovs); |
1876 | if (err) | |
1877 | goto out; | |
1878 | ||
1879 | err = fuse_verify_ioctl_iov(out_iov, out_iovs); | |
1880 | if (err) | |
1881 | goto out; | |
1882 | ||
59efec7b TH |
1883 | goto retry; |
1884 | } | |
1885 | ||
1886 | err = -EIO; | |
1887 | if (transferred > inarg.out_size) | |
1888 | goto out; | |
1889 | ||
1890 | err = fuse_ioctl_copy_user(pages, out_iov, out_iovs, transferred, true); | |
1891 | out: | |
1892 | if (req) | |
1893 | fuse_put_request(fc, req); | |
1894 | if (iov_page) | |
1895 | __free_page(iov_page); | |
1896 | while (num_pages) | |
1897 | __free_page(pages[--num_pages]); | |
1898 | kfree(pages); | |
1899 | ||
1900 | return err ? err : outarg.result; | |
1901 | } | |
08cbf542 | 1902 | EXPORT_SYMBOL_GPL(fuse_do_ioctl); |
59efec7b | 1903 | |
d36f2487 MS |
1904 | static long fuse_file_ioctl_common(struct file *file, unsigned int cmd, |
1905 | unsigned long arg, unsigned int flags) | |
1906 | { | |
1907 | struct inode *inode = file->f_dentry->d_inode; | |
1908 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1909 | ||
1910 | if (!fuse_allow_task(fc, current)) | |
1911 | return -EACCES; | |
1912 | ||
1913 | if (is_bad_inode(inode)) | |
1914 | return -EIO; | |
1915 | ||
1916 | return fuse_do_ioctl(file, cmd, arg, flags); | |
1917 | } | |
1918 | ||
59efec7b TH |
1919 | static long fuse_file_ioctl(struct file *file, unsigned int cmd, |
1920 | unsigned long arg) | |
1921 | { | |
d36f2487 | 1922 | return fuse_file_ioctl_common(file, cmd, arg, 0); |
59efec7b TH |
1923 | } |
1924 | ||
1925 | static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd, | |
1926 | unsigned long arg) | |
1927 | { | |
d36f2487 | 1928 | return fuse_file_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT); |
59efec7b TH |
1929 | } |
1930 | ||
95668a69 TH |
1931 | /* |
1932 | * All files which have been polled are linked to RB tree | |
1933 | * fuse_conn->polled_files which is indexed by kh. Walk the tree and | |
1934 | * find the matching one. | |
1935 | */ | |
1936 | static struct rb_node **fuse_find_polled_node(struct fuse_conn *fc, u64 kh, | |
1937 | struct rb_node **parent_out) | |
1938 | { | |
1939 | struct rb_node **link = &fc->polled_files.rb_node; | |
1940 | struct rb_node *last = NULL; | |
1941 | ||
1942 | while (*link) { | |
1943 | struct fuse_file *ff; | |
1944 | ||
1945 | last = *link; | |
1946 | ff = rb_entry(last, struct fuse_file, polled_node); | |
1947 | ||
1948 | if (kh < ff->kh) | |
1949 | link = &last->rb_left; | |
1950 | else if (kh > ff->kh) | |
1951 | link = &last->rb_right; | |
1952 | else | |
1953 | return link; | |
1954 | } | |
1955 | ||
1956 | if (parent_out) | |
1957 | *parent_out = last; | |
1958 | return link; | |
1959 | } | |
1960 | ||
1961 | /* | |
1962 | * The file is about to be polled. Make sure it's on the polled_files | |
1963 | * RB tree. Note that files once added to the polled_files tree are | |
1964 | * not removed before the file is released. This is because a file | |
1965 | * polled once is likely to be polled again. | |
1966 | */ | |
1967 | static void fuse_register_polled_file(struct fuse_conn *fc, | |
1968 | struct fuse_file *ff) | |
1969 | { | |
1970 | spin_lock(&fc->lock); | |
1971 | if (RB_EMPTY_NODE(&ff->polled_node)) { | |
1972 | struct rb_node **link, *parent; | |
1973 | ||
1974 | link = fuse_find_polled_node(fc, ff->kh, &parent); | |
1975 | BUG_ON(*link); | |
1976 | rb_link_node(&ff->polled_node, parent, link); | |
1977 | rb_insert_color(&ff->polled_node, &fc->polled_files); | |
1978 | } | |
1979 | spin_unlock(&fc->lock); | |
1980 | } | |
1981 | ||
08cbf542 | 1982 | unsigned fuse_file_poll(struct file *file, poll_table *wait) |
95668a69 | 1983 | { |
95668a69 | 1984 | struct fuse_file *ff = file->private_data; |
797759aa | 1985 | struct fuse_conn *fc = ff->fc; |
95668a69 TH |
1986 | struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh }; |
1987 | struct fuse_poll_out outarg; | |
1988 | struct fuse_req *req; | |
1989 | int err; | |
1990 | ||
1991 | if (fc->no_poll) | |
1992 | return DEFAULT_POLLMASK; | |
1993 | ||
1994 | poll_wait(file, &ff->poll_wait, wait); | |
1995 | ||
1996 | /* | |
1997 | * Ask for notification iff there's someone waiting for it. | |
1998 | * The client may ignore the flag and always notify. | |
1999 | */ | |
2000 | if (waitqueue_active(&ff->poll_wait)) { | |
2001 | inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY; | |
2002 | fuse_register_polled_file(fc, ff); | |
2003 | } | |
2004 | ||
2005 | req = fuse_get_req(fc); | |
2006 | if (IS_ERR(req)) | |
201fa69a | 2007 | return POLLERR; |
95668a69 TH |
2008 | |
2009 | req->in.h.opcode = FUSE_POLL; | |
797759aa | 2010 | req->in.h.nodeid = ff->nodeid; |
95668a69 TH |
2011 | req->in.numargs = 1; |
2012 | req->in.args[0].size = sizeof(inarg); | |
2013 | req->in.args[0].value = &inarg; | |
2014 | req->out.numargs = 1; | |
2015 | req->out.args[0].size = sizeof(outarg); | |
2016 | req->out.args[0].value = &outarg; | |
b93f858a | 2017 | fuse_request_send(fc, req); |
95668a69 TH |
2018 | err = req->out.h.error; |
2019 | fuse_put_request(fc, req); | |
2020 | ||
2021 | if (!err) | |
2022 | return outarg.revents; | |
2023 | if (err == -ENOSYS) { | |
2024 | fc->no_poll = 1; | |
2025 | return DEFAULT_POLLMASK; | |
2026 | } | |
2027 | return POLLERR; | |
2028 | } | |
08cbf542 | 2029 | EXPORT_SYMBOL_GPL(fuse_file_poll); |
95668a69 TH |
2030 | |
2031 | /* | |
2032 | * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and | |
2033 | * wakes up the poll waiters. | |
2034 | */ | |
2035 | int fuse_notify_poll_wakeup(struct fuse_conn *fc, | |
2036 | struct fuse_notify_poll_wakeup_out *outarg) | |
2037 | { | |
2038 | u64 kh = outarg->kh; | |
2039 | struct rb_node **link; | |
2040 | ||
2041 | spin_lock(&fc->lock); | |
2042 | ||
2043 | link = fuse_find_polled_node(fc, kh, NULL); | |
2044 | if (*link) { | |
2045 | struct fuse_file *ff; | |
2046 | ||
2047 | ff = rb_entry(*link, struct fuse_file, polled_node); | |
2048 | wake_up_interruptible_sync(&ff->poll_wait); | |
2049 | } | |
2050 | ||
2051 | spin_unlock(&fc->lock); | |
2052 | return 0; | |
2053 | } | |
2054 | ||
4b6f5d20 | 2055 | static const struct file_operations fuse_file_operations = { |
5559b8f4 | 2056 | .llseek = fuse_file_llseek, |
543ade1f | 2057 | .read = do_sync_read, |
bcb4be80 | 2058 | .aio_read = fuse_file_aio_read, |
543ade1f | 2059 | .write = do_sync_write, |
ea9b9907 | 2060 | .aio_write = fuse_file_aio_write, |
b6aeaded MS |
2061 | .mmap = fuse_file_mmap, |
2062 | .open = fuse_open, | |
2063 | .flush = fuse_flush, | |
2064 | .release = fuse_release, | |
2065 | .fsync = fuse_fsync, | |
71421259 | 2066 | .lock = fuse_file_lock, |
a9ff4f87 | 2067 | .flock = fuse_file_flock, |
5ffc4ef4 | 2068 | .splice_read = generic_file_splice_read, |
59efec7b TH |
2069 | .unlocked_ioctl = fuse_file_ioctl, |
2070 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 2071 | .poll = fuse_file_poll, |
b6aeaded MS |
2072 | }; |
2073 | ||
4b6f5d20 | 2074 | static const struct file_operations fuse_direct_io_file_operations = { |
5559b8f4 | 2075 | .llseek = fuse_file_llseek, |
413ef8cb MS |
2076 | .read = fuse_direct_read, |
2077 | .write = fuse_direct_write, | |
fc280c96 | 2078 | .mmap = fuse_direct_mmap, |
413ef8cb MS |
2079 | .open = fuse_open, |
2080 | .flush = fuse_flush, | |
2081 | .release = fuse_release, | |
2082 | .fsync = fuse_fsync, | |
71421259 | 2083 | .lock = fuse_file_lock, |
a9ff4f87 | 2084 | .flock = fuse_file_flock, |
59efec7b TH |
2085 | .unlocked_ioctl = fuse_file_ioctl, |
2086 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 2087 | .poll = fuse_file_poll, |
fc280c96 | 2088 | /* no splice_read */ |
413ef8cb MS |
2089 | }; |
2090 | ||
f5e54d6e | 2091 | static const struct address_space_operations fuse_file_aops = { |
b6aeaded | 2092 | .readpage = fuse_readpage, |
3be5a52b MS |
2093 | .writepage = fuse_writepage, |
2094 | .launder_page = fuse_launder_page, | |
5e6f58a1 NP |
2095 | .write_begin = fuse_write_begin, |
2096 | .write_end = fuse_write_end, | |
db50b96c | 2097 | .readpages = fuse_readpages, |
3be5a52b | 2098 | .set_page_dirty = __set_page_dirty_nobuffers, |
b2d2272f | 2099 | .bmap = fuse_bmap, |
b6aeaded MS |
2100 | }; |
2101 | ||
2102 | void fuse_init_file_inode(struct inode *inode) | |
2103 | { | |
45323fb7 MS |
2104 | inode->i_fop = &fuse_file_operations; |
2105 | inode->i_data.a_ops = &fuse_file_aops; | |
b6aeaded | 2106 | } |