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Commit | Line | Data |
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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 | ||
5a18ec17 MS |
89 | static void fuse_release_async(struct work_struct *work) |
90 | { | |
91 | struct fuse_req *req; | |
92 | struct fuse_conn *fc; | |
93 | struct path path; | |
94 | ||
95 | req = container_of(work, struct fuse_req, misc.release.work); | |
96 | path = req->misc.release.path; | |
97 | fc = get_fuse_conn(path.dentry->d_inode); | |
98 | ||
99 | fuse_put_request(fc, req); | |
100 | path_put(&path); | |
101 | } | |
102 | ||
819c4b3b MS |
103 | static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req) |
104 | { | |
5a18ec17 MS |
105 | if (fc->destroy_req) { |
106 | /* | |
107 | * If this is a fuseblk mount, then it's possible that | |
108 | * releasing the path will result in releasing the | |
109 | * super block and sending the DESTROY request. If | |
110 | * the server is single threaded, this would hang. | |
111 | * For this reason do the path_put() in a separate | |
112 | * thread. | |
113 | */ | |
114 | atomic_inc(&req->count); | |
115 | INIT_WORK(&req->misc.release.work, fuse_release_async); | |
116 | schedule_work(&req->misc.release.work); | |
117 | } else { | |
118 | path_put(&req->misc.release.path); | |
119 | } | |
819c4b3b MS |
120 | } |
121 | ||
5a18ec17 | 122 | static void fuse_file_put(struct fuse_file *ff, bool sync) |
c756e0a4 MS |
123 | { |
124 | if (atomic_dec_and_test(&ff->count)) { | |
125 | struct fuse_req *req = ff->reserved_req; | |
8b0797a4 | 126 | |
5a18ec17 MS |
127 | if (sync) { |
128 | fuse_request_send(ff->fc, req); | |
129 | path_put(&req->misc.release.path); | |
130 | fuse_put_request(ff->fc, req); | |
131 | } else { | |
132 | req->end = fuse_release_end; | |
133 | fuse_request_send_background(ff->fc, req); | |
134 | } | |
c756e0a4 MS |
135 | kfree(ff); |
136 | } | |
137 | } | |
138 | ||
08cbf542 TH |
139 | int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
140 | bool isdir) | |
91fe96b4 MS |
141 | { |
142 | struct fuse_open_out outarg; | |
143 | struct fuse_file *ff; | |
144 | int err; | |
145 | int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; | |
146 | ||
147 | ff = fuse_file_alloc(fc); | |
148 | if (!ff) | |
149 | return -ENOMEM; | |
150 | ||
151 | err = fuse_send_open(fc, nodeid, file, opcode, &outarg); | |
152 | if (err) { | |
153 | fuse_file_free(ff); | |
154 | return err; | |
155 | } | |
156 | ||
157 | if (isdir) | |
158 | outarg.open_flags &= ~FOPEN_DIRECT_IO; | |
159 | ||
160 | ff->fh = outarg.fh; | |
161 | ff->nodeid = nodeid; | |
162 | ff->open_flags = outarg.open_flags; | |
163 | file->private_data = fuse_file_get(ff); | |
164 | ||
165 | return 0; | |
166 | } | |
08cbf542 | 167 | EXPORT_SYMBOL_GPL(fuse_do_open); |
91fe96b4 | 168 | |
c7b7143c | 169 | void fuse_finish_open(struct inode *inode, struct file *file) |
fd72faac | 170 | { |
c7b7143c | 171 | struct fuse_file *ff = file->private_data; |
a0822c55 | 172 | struct fuse_conn *fc = get_fuse_conn(inode); |
c7b7143c MS |
173 | |
174 | if (ff->open_flags & FOPEN_DIRECT_IO) | |
fd72faac | 175 | file->f_op = &fuse_direct_io_file_operations; |
c7b7143c | 176 | if (!(ff->open_flags & FOPEN_KEEP_CACHE)) |
b1009979 | 177 | invalidate_inode_pages2(inode->i_mapping); |
c7b7143c | 178 | if (ff->open_flags & FOPEN_NONSEEKABLE) |
a7c1b990 | 179 | nonseekable_open(inode, file); |
a0822c55 KS |
180 | if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC)) { |
181 | struct fuse_inode *fi = get_fuse_inode(inode); | |
182 | ||
183 | spin_lock(&fc->lock); | |
184 | fi->attr_version = ++fc->attr_version; | |
185 | i_size_write(inode, 0); | |
186 | spin_unlock(&fc->lock); | |
187 | fuse_invalidate_attr(inode); | |
188 | } | |
fd72faac MS |
189 | } |
190 | ||
91fe96b4 | 191 | int fuse_open_common(struct inode *inode, struct file *file, bool isdir) |
fd72faac | 192 | { |
acf99433 | 193 | struct fuse_conn *fc = get_fuse_conn(inode); |
b6aeaded | 194 | int err; |
b6aeaded | 195 | |
dd190d06 MS |
196 | /* VFS checks this, but only _after_ ->open() */ |
197 | if (file->f_flags & O_DIRECT) | |
198 | return -EINVAL; | |
199 | ||
b6aeaded MS |
200 | err = generic_file_open(inode, file); |
201 | if (err) | |
202 | return err; | |
203 | ||
91fe96b4 | 204 | err = fuse_do_open(fc, get_node_id(inode), file, isdir); |
fd72faac | 205 | if (err) |
91fe96b4 | 206 | return err; |
b6aeaded | 207 | |
91fe96b4 MS |
208 | fuse_finish_open(inode, file); |
209 | ||
210 | return 0; | |
b6aeaded MS |
211 | } |
212 | ||
8b0797a4 | 213 | static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode) |
64c6d8ed | 214 | { |
8b0797a4 | 215 | struct fuse_conn *fc = ff->fc; |
33649c91 | 216 | struct fuse_req *req = ff->reserved_req; |
b57d4264 | 217 | struct fuse_release_in *inarg = &req->misc.release.in; |
b6aeaded | 218 | |
8b0797a4 MS |
219 | spin_lock(&fc->lock); |
220 | list_del(&ff->write_entry); | |
221 | if (!RB_EMPTY_NODE(&ff->polled_node)) | |
222 | rb_erase(&ff->polled_node, &fc->polled_files); | |
223 | spin_unlock(&fc->lock); | |
224 | ||
357ccf2b | 225 | wake_up_interruptible_all(&ff->poll_wait); |
8b0797a4 | 226 | |
b6aeaded | 227 | inarg->fh = ff->fh; |
fd72faac | 228 | inarg->flags = flags; |
51eb01e7 | 229 | req->in.h.opcode = opcode; |
c7b7143c | 230 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
231 | req->in.numargs = 1; |
232 | req->in.args[0].size = sizeof(struct fuse_release_in); | |
233 | req->in.args[0].value = inarg; | |
fd72faac MS |
234 | } |
235 | ||
8b0797a4 | 236 | void fuse_release_common(struct file *file, int opcode) |
fd72faac | 237 | { |
6b2db28a TH |
238 | struct fuse_file *ff; |
239 | struct fuse_req *req; | |
b6aeaded | 240 | |
6b2db28a TH |
241 | ff = file->private_data; |
242 | if (unlikely(!ff)) | |
8b0797a4 | 243 | return; |
6b2db28a | 244 | |
6b2db28a | 245 | req = ff->reserved_req; |
8b0797a4 | 246 | fuse_prepare_release(ff, file->f_flags, opcode); |
6b2db28a | 247 | |
37fb3a30 MS |
248 | if (ff->flock) { |
249 | struct fuse_release_in *inarg = &req->misc.release.in; | |
250 | inarg->release_flags |= FUSE_RELEASE_FLOCK_UNLOCK; | |
251 | inarg->lock_owner = fuse_lock_owner_id(ff->fc, | |
252 | (fl_owner_t) file); | |
253 | } | |
6b2db28a | 254 | /* Hold vfsmount and dentry until release is finished */ |
b0be46eb MS |
255 | path_get(&file->f_path); |
256 | req->misc.release.path = file->f_path; | |
6b2db28a | 257 | |
6b2db28a TH |
258 | /* |
259 | * Normally this will send the RELEASE request, however if | |
260 | * some asynchronous READ or WRITE requests are outstanding, | |
261 | * the sending will be delayed. | |
5a18ec17 MS |
262 | * |
263 | * Make the release synchronous if this is a fuseblk mount, | |
264 | * synchronous RELEASE is allowed (and desirable) in this case | |
265 | * because the server can be trusted not to screw up. | |
6b2db28a | 266 | */ |
5a18ec17 | 267 | fuse_file_put(ff, ff->fc->destroy_req != NULL); |
b6aeaded MS |
268 | } |
269 | ||
04730fef MS |
270 | static int fuse_open(struct inode *inode, struct file *file) |
271 | { | |
91fe96b4 | 272 | return fuse_open_common(inode, file, false); |
04730fef MS |
273 | } |
274 | ||
275 | static int fuse_release(struct inode *inode, struct file *file) | |
276 | { | |
8b0797a4 MS |
277 | fuse_release_common(file, FUSE_RELEASE); |
278 | ||
279 | /* return value is ignored by VFS */ | |
280 | return 0; | |
281 | } | |
282 | ||
283 | void fuse_sync_release(struct fuse_file *ff, int flags) | |
284 | { | |
285 | WARN_ON(atomic_read(&ff->count) > 1); | |
286 | fuse_prepare_release(ff, flags, FUSE_RELEASE); | |
287 | ff->reserved_req->force = 1; | |
288 | fuse_request_send(ff->fc, ff->reserved_req); | |
289 | fuse_put_request(ff->fc, ff->reserved_req); | |
290 | kfree(ff); | |
04730fef | 291 | } |
08cbf542 | 292 | EXPORT_SYMBOL_GPL(fuse_sync_release); |
04730fef | 293 | |
71421259 | 294 | /* |
9c8ef561 MS |
295 | * Scramble the ID space with XTEA, so that the value of the files_struct |
296 | * pointer is not exposed to userspace. | |
71421259 | 297 | */ |
f3332114 | 298 | u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id) |
71421259 | 299 | { |
9c8ef561 MS |
300 | u32 *k = fc->scramble_key; |
301 | u64 v = (unsigned long) id; | |
302 | u32 v0 = v; | |
303 | u32 v1 = v >> 32; | |
304 | u32 sum = 0; | |
305 | int i; | |
306 | ||
307 | for (i = 0; i < 32; i++) { | |
308 | v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]); | |
309 | sum += 0x9E3779B9; | |
310 | v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]); | |
311 | } | |
312 | ||
313 | return (u64) v0 + ((u64) v1 << 32); | |
71421259 MS |
314 | } |
315 | ||
3be5a52b MS |
316 | /* |
317 | * Check if page is under writeback | |
318 | * | |
319 | * This is currently done by walking the list of writepage requests | |
320 | * for the inode, which can be pretty inefficient. | |
321 | */ | |
322 | static bool fuse_page_is_writeback(struct inode *inode, pgoff_t index) | |
323 | { | |
324 | struct fuse_conn *fc = get_fuse_conn(inode); | |
325 | struct fuse_inode *fi = get_fuse_inode(inode); | |
326 | struct fuse_req *req; | |
327 | bool found = false; | |
328 | ||
329 | spin_lock(&fc->lock); | |
330 | list_for_each_entry(req, &fi->writepages, writepages_entry) { | |
331 | pgoff_t curr_index; | |
332 | ||
333 | BUG_ON(req->inode != inode); | |
334 | curr_index = req->misc.write.in.offset >> PAGE_CACHE_SHIFT; | |
335 | if (curr_index == index) { | |
336 | found = true; | |
337 | break; | |
338 | } | |
339 | } | |
340 | spin_unlock(&fc->lock); | |
341 | ||
342 | return found; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Wait for page writeback to be completed. | |
347 | * | |
348 | * Since fuse doesn't rely on the VM writeback tracking, this has to | |
349 | * use some other means. | |
350 | */ | |
351 | static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index) | |
352 | { | |
353 | struct fuse_inode *fi = get_fuse_inode(inode); | |
354 | ||
355 | wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index)); | |
356 | return 0; | |
357 | } | |
358 | ||
75e1fcc0 | 359 | static int fuse_flush(struct file *file, fl_owner_t id) |
b6aeaded | 360 | { |
7706a9d6 | 361 | struct inode *inode = file->f_path.dentry->d_inode; |
b6aeaded MS |
362 | struct fuse_conn *fc = get_fuse_conn(inode); |
363 | struct fuse_file *ff = file->private_data; | |
364 | struct fuse_req *req; | |
365 | struct fuse_flush_in inarg; | |
366 | int err; | |
367 | ||
248d86e8 MS |
368 | if (is_bad_inode(inode)) |
369 | return -EIO; | |
370 | ||
b6aeaded MS |
371 | if (fc->no_flush) |
372 | return 0; | |
373 | ||
33649c91 | 374 | req = fuse_get_req_nofail(fc, file); |
b6aeaded MS |
375 | memset(&inarg, 0, sizeof(inarg)); |
376 | inarg.fh = ff->fh; | |
9c8ef561 | 377 | inarg.lock_owner = fuse_lock_owner_id(fc, id); |
b6aeaded MS |
378 | req->in.h.opcode = FUSE_FLUSH; |
379 | req->in.h.nodeid = get_node_id(inode); | |
b6aeaded MS |
380 | req->in.numargs = 1; |
381 | req->in.args[0].size = sizeof(inarg); | |
382 | req->in.args[0].value = &inarg; | |
71421259 | 383 | req->force = 1; |
b93f858a | 384 | fuse_request_send(fc, req); |
b6aeaded MS |
385 | err = req->out.h.error; |
386 | fuse_put_request(fc, req); | |
387 | if (err == -ENOSYS) { | |
388 | fc->no_flush = 1; | |
389 | err = 0; | |
390 | } | |
391 | return err; | |
392 | } | |
393 | ||
3be5a52b MS |
394 | /* |
395 | * Wait for all pending writepages on the inode to finish. | |
396 | * | |
397 | * This is currently done by blocking further writes with FUSE_NOWRITE | |
398 | * and waiting for all sent writes to complete. | |
399 | * | |
400 | * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage | |
401 | * could conflict with truncation. | |
402 | */ | |
403 | static void fuse_sync_writes(struct inode *inode) | |
404 | { | |
405 | fuse_set_nowrite(inode); | |
406 | fuse_release_nowrite(inode); | |
407 | } | |
408 | ||
7ea80859 | 409 | int fuse_fsync_common(struct file *file, int datasync, int isdir) |
b6aeaded | 410 | { |
7ea80859 | 411 | struct inode *inode = file->f_mapping->host; |
b6aeaded MS |
412 | struct fuse_conn *fc = get_fuse_conn(inode); |
413 | struct fuse_file *ff = file->private_data; | |
414 | struct fuse_req *req; | |
415 | struct fuse_fsync_in inarg; | |
416 | int err; | |
417 | ||
248d86e8 MS |
418 | if (is_bad_inode(inode)) |
419 | return -EIO; | |
420 | ||
82547981 | 421 | if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir)) |
b6aeaded MS |
422 | return 0; |
423 | ||
3be5a52b MS |
424 | /* |
425 | * Start writeback against all dirty pages of the inode, then | |
426 | * wait for all outstanding writes, before sending the FSYNC | |
427 | * request. | |
428 | */ | |
429 | err = write_inode_now(inode, 0); | |
430 | if (err) | |
431 | return err; | |
432 | ||
433 | fuse_sync_writes(inode); | |
434 | ||
ce1d5a49 MS |
435 | req = fuse_get_req(fc); |
436 | if (IS_ERR(req)) | |
437 | return PTR_ERR(req); | |
b6aeaded MS |
438 | |
439 | memset(&inarg, 0, sizeof(inarg)); | |
440 | inarg.fh = ff->fh; | |
441 | inarg.fsync_flags = datasync ? 1 : 0; | |
82547981 | 442 | req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC; |
b6aeaded | 443 | req->in.h.nodeid = get_node_id(inode); |
b6aeaded MS |
444 | req->in.numargs = 1; |
445 | req->in.args[0].size = sizeof(inarg); | |
446 | req->in.args[0].value = &inarg; | |
b93f858a | 447 | fuse_request_send(fc, req); |
b6aeaded MS |
448 | err = req->out.h.error; |
449 | fuse_put_request(fc, req); | |
450 | if (err == -ENOSYS) { | |
82547981 MS |
451 | if (isdir) |
452 | fc->no_fsyncdir = 1; | |
453 | else | |
454 | fc->no_fsync = 1; | |
b6aeaded MS |
455 | err = 0; |
456 | } | |
457 | return err; | |
458 | } | |
459 | ||
7ea80859 | 460 | static int fuse_fsync(struct file *file, int datasync) |
82547981 | 461 | { |
7ea80859 | 462 | return fuse_fsync_common(file, datasync, 0); |
82547981 MS |
463 | } |
464 | ||
2106cb18 MS |
465 | void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos, |
466 | size_t count, int opcode) | |
b6aeaded | 467 | { |
5c5c5e51 | 468 | struct fuse_read_in *inarg = &req->misc.read.in; |
a6643094 | 469 | struct fuse_file *ff = file->private_data; |
b6aeaded | 470 | |
361b1eb5 MS |
471 | inarg->fh = ff->fh; |
472 | inarg->offset = pos; | |
473 | inarg->size = count; | |
a6643094 | 474 | inarg->flags = file->f_flags; |
361b1eb5 | 475 | req->in.h.opcode = opcode; |
2106cb18 | 476 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
477 | req->in.numargs = 1; |
478 | req->in.args[0].size = sizeof(struct fuse_read_in); | |
c1aa96a5 | 479 | req->in.args[0].value = inarg; |
b6aeaded MS |
480 | req->out.argvar = 1; |
481 | req->out.numargs = 1; | |
482 | req->out.args[0].size = count; | |
b6aeaded MS |
483 | } |
484 | ||
8bfc016d | 485 | static size_t fuse_send_read(struct fuse_req *req, struct file *file, |
2106cb18 | 486 | loff_t pos, size_t count, fl_owner_t owner) |
04730fef | 487 | { |
2106cb18 MS |
488 | struct fuse_file *ff = file->private_data; |
489 | struct fuse_conn *fc = ff->fc; | |
f3332114 | 490 | |
2106cb18 | 491 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
f3332114 | 492 | if (owner != NULL) { |
5c5c5e51 | 493 | struct fuse_read_in *inarg = &req->misc.read.in; |
f3332114 MS |
494 | |
495 | inarg->read_flags |= FUSE_READ_LOCKOWNER; | |
496 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
497 | } | |
b93f858a | 498 | fuse_request_send(fc, req); |
361b1eb5 | 499 | return req->out.args[0].size; |
04730fef MS |
500 | } |
501 | ||
5c5c5e51 MS |
502 | static void fuse_read_update_size(struct inode *inode, loff_t size, |
503 | u64 attr_ver) | |
504 | { | |
505 | struct fuse_conn *fc = get_fuse_conn(inode); | |
506 | struct fuse_inode *fi = get_fuse_inode(inode); | |
507 | ||
508 | spin_lock(&fc->lock); | |
509 | if (attr_ver == fi->attr_version && size < inode->i_size) { | |
510 | fi->attr_version = ++fc->attr_version; | |
511 | i_size_write(inode, size); | |
512 | } | |
513 | spin_unlock(&fc->lock); | |
514 | } | |
515 | ||
b6aeaded MS |
516 | static int fuse_readpage(struct file *file, struct page *page) |
517 | { | |
518 | struct inode *inode = page->mapping->host; | |
519 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 | 520 | struct fuse_req *req; |
5c5c5e51 MS |
521 | size_t num_read; |
522 | loff_t pos = page_offset(page); | |
523 | size_t count = PAGE_CACHE_SIZE; | |
524 | u64 attr_ver; | |
248d86e8 MS |
525 | int err; |
526 | ||
527 | err = -EIO; | |
528 | if (is_bad_inode(inode)) | |
529 | goto out; | |
530 | ||
3be5a52b | 531 | /* |
25985edc | 532 | * Page writeback can extend beyond the lifetime of the |
3be5a52b MS |
533 | * page-cache page, so make sure we read a properly synced |
534 | * page. | |
535 | */ | |
536 | fuse_wait_on_page_writeback(inode, page->index); | |
537 | ||
ce1d5a49 MS |
538 | req = fuse_get_req(fc); |
539 | err = PTR_ERR(req); | |
540 | if (IS_ERR(req)) | |
b6aeaded MS |
541 | goto out; |
542 | ||
5c5c5e51 MS |
543 | attr_ver = fuse_get_attr_version(fc); |
544 | ||
b6aeaded | 545 | req->out.page_zeroing = 1; |
f4975c67 | 546 | req->out.argpages = 1; |
b6aeaded MS |
547 | req->num_pages = 1; |
548 | req->pages[0] = page; | |
2106cb18 | 549 | num_read = fuse_send_read(req, file, pos, count, NULL); |
b6aeaded MS |
550 | err = req->out.h.error; |
551 | fuse_put_request(fc, req); | |
5c5c5e51 MS |
552 | |
553 | if (!err) { | |
554 | /* | |
555 | * Short read means EOF. If file size is larger, truncate it | |
556 | */ | |
557 | if (num_read < count) | |
558 | fuse_read_update_size(inode, pos + num_read, attr_ver); | |
559 | ||
b6aeaded | 560 | SetPageUptodate(page); |
5c5c5e51 MS |
561 | } |
562 | ||
b36c31ba | 563 | fuse_invalidate_attr(inode); /* atime changed */ |
b6aeaded MS |
564 | out: |
565 | unlock_page(page); | |
566 | return err; | |
567 | } | |
568 | ||
c1aa96a5 | 569 | static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req) |
db50b96c | 570 | { |
c1aa96a5 | 571 | int i; |
5c5c5e51 MS |
572 | size_t count = req->misc.read.in.size; |
573 | size_t num_read = req->out.args[0].size; | |
ce534fb0 | 574 | struct address_space *mapping = NULL; |
c1aa96a5 | 575 | |
ce534fb0 MS |
576 | for (i = 0; mapping == NULL && i < req->num_pages; i++) |
577 | mapping = req->pages[i]->mapping; | |
5c5c5e51 | 578 | |
ce534fb0 MS |
579 | if (mapping) { |
580 | struct inode *inode = mapping->host; | |
581 | ||
582 | /* | |
583 | * Short read means EOF. If file size is larger, truncate it | |
584 | */ | |
585 | if (!req->out.h.error && num_read < count) { | |
586 | loff_t pos; | |
587 | ||
588 | pos = page_offset(req->pages[0]) + num_read; | |
589 | fuse_read_update_size(inode, pos, | |
590 | req->misc.read.attr_ver); | |
591 | } | |
592 | fuse_invalidate_attr(inode); /* atime changed */ | |
593 | } | |
c1aa96a5 | 594 | |
db50b96c MS |
595 | for (i = 0; i < req->num_pages; i++) { |
596 | struct page *page = req->pages[i]; | |
597 | if (!req->out.h.error) | |
598 | SetPageUptodate(page); | |
c1aa96a5 MS |
599 | else |
600 | SetPageError(page); | |
db50b96c | 601 | unlock_page(page); |
b5dd3285 | 602 | page_cache_release(page); |
db50b96c | 603 | } |
c756e0a4 | 604 | if (req->ff) |
5a18ec17 | 605 | fuse_file_put(req->ff, false); |
c1aa96a5 MS |
606 | } |
607 | ||
2106cb18 | 608 | static void fuse_send_readpages(struct fuse_req *req, struct file *file) |
c1aa96a5 | 609 | { |
2106cb18 MS |
610 | struct fuse_file *ff = file->private_data; |
611 | struct fuse_conn *fc = ff->fc; | |
c1aa96a5 MS |
612 | loff_t pos = page_offset(req->pages[0]); |
613 | size_t count = req->num_pages << PAGE_CACHE_SHIFT; | |
f4975c67 MS |
614 | |
615 | req->out.argpages = 1; | |
c1aa96a5 | 616 | req->out.page_zeroing = 1; |
ce534fb0 | 617 | req->out.page_replace = 1; |
2106cb18 | 618 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
5c5c5e51 | 619 | req->misc.read.attr_ver = fuse_get_attr_version(fc); |
9cd68455 | 620 | if (fc->async_read) { |
c756e0a4 | 621 | req->ff = fuse_file_get(ff); |
9cd68455 | 622 | req->end = fuse_readpages_end; |
b93f858a | 623 | fuse_request_send_background(fc, req); |
9cd68455 | 624 | } else { |
b93f858a | 625 | fuse_request_send(fc, req); |
9cd68455 | 626 | fuse_readpages_end(fc, req); |
e9bb09dd | 627 | fuse_put_request(fc, req); |
9cd68455 | 628 | } |
db50b96c MS |
629 | } |
630 | ||
c756e0a4 | 631 | struct fuse_fill_data { |
db50b96c | 632 | struct fuse_req *req; |
a6643094 | 633 | struct file *file; |
db50b96c MS |
634 | struct inode *inode; |
635 | }; | |
636 | ||
637 | static int fuse_readpages_fill(void *_data, struct page *page) | |
638 | { | |
c756e0a4 | 639 | struct fuse_fill_data *data = _data; |
db50b96c MS |
640 | struct fuse_req *req = data->req; |
641 | struct inode *inode = data->inode; | |
642 | struct fuse_conn *fc = get_fuse_conn(inode); | |
643 | ||
3be5a52b MS |
644 | fuse_wait_on_page_writeback(inode, page->index); |
645 | ||
db50b96c MS |
646 | if (req->num_pages && |
647 | (req->num_pages == FUSE_MAX_PAGES_PER_REQ || | |
648 | (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read || | |
649 | req->pages[req->num_pages - 1]->index + 1 != page->index)) { | |
2106cb18 | 650 | fuse_send_readpages(req, data->file); |
ce1d5a49 MS |
651 | data->req = req = fuse_get_req(fc); |
652 | if (IS_ERR(req)) { | |
db50b96c | 653 | unlock_page(page); |
ce1d5a49 | 654 | return PTR_ERR(req); |
db50b96c | 655 | } |
db50b96c | 656 | } |
b5dd3285 | 657 | page_cache_get(page); |
db50b96c | 658 | req->pages[req->num_pages] = page; |
1729a16c | 659 | req->num_pages++; |
db50b96c MS |
660 | return 0; |
661 | } | |
662 | ||
663 | static int fuse_readpages(struct file *file, struct address_space *mapping, | |
664 | struct list_head *pages, unsigned nr_pages) | |
665 | { | |
666 | struct inode *inode = mapping->host; | |
667 | struct fuse_conn *fc = get_fuse_conn(inode); | |
c756e0a4 | 668 | struct fuse_fill_data data; |
db50b96c | 669 | int err; |
248d86e8 | 670 | |
1d7ea732 | 671 | err = -EIO; |
248d86e8 | 672 | if (is_bad_inode(inode)) |
2e990021 | 673 | goto out; |
248d86e8 | 674 | |
a6643094 | 675 | data.file = file; |
db50b96c | 676 | data.inode = inode; |
ce1d5a49 | 677 | data.req = fuse_get_req(fc); |
1d7ea732 | 678 | err = PTR_ERR(data.req); |
ce1d5a49 | 679 | if (IS_ERR(data.req)) |
2e990021 | 680 | goto out; |
db50b96c MS |
681 | |
682 | err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); | |
d3406ffa MS |
683 | if (!err) { |
684 | if (data.req->num_pages) | |
2106cb18 | 685 | fuse_send_readpages(data.req, file); |
d3406ffa MS |
686 | else |
687 | fuse_put_request(fc, data.req); | |
688 | } | |
2e990021 | 689 | out: |
1d7ea732 | 690 | return err; |
db50b96c MS |
691 | } |
692 | ||
bcb4be80 MS |
693 | static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov, |
694 | unsigned long nr_segs, loff_t pos) | |
695 | { | |
696 | struct inode *inode = iocb->ki_filp->f_mapping->host; | |
697 | ||
698 | if (pos + iov_length(iov, nr_segs) > i_size_read(inode)) { | |
699 | int err; | |
700 | /* | |
701 | * If trying to read past EOF, make sure the i_size | |
702 | * attribute is up-to-date. | |
703 | */ | |
704 | err = fuse_update_attributes(inode, NULL, iocb->ki_filp, NULL); | |
705 | if (err) | |
706 | return err; | |
707 | } | |
708 | ||
709 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
710 | } | |
711 | ||
2d698b07 | 712 | static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff, |
2106cb18 | 713 | loff_t pos, size_t count) |
b6aeaded | 714 | { |
b25e82e5 MS |
715 | struct fuse_write_in *inarg = &req->misc.write.in; |
716 | struct fuse_write_out *outarg = &req->misc.write.out; | |
b6aeaded | 717 | |
b25e82e5 MS |
718 | inarg->fh = ff->fh; |
719 | inarg->offset = pos; | |
720 | inarg->size = count; | |
b6aeaded | 721 | req->in.h.opcode = FUSE_WRITE; |
2106cb18 | 722 | req->in.h.nodeid = ff->nodeid; |
b6aeaded | 723 | req->in.numargs = 2; |
2106cb18 | 724 | if (ff->fc->minor < 9) |
f3332114 MS |
725 | req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE; |
726 | else | |
727 | req->in.args[0].size = sizeof(struct fuse_write_in); | |
b25e82e5 | 728 | req->in.args[0].value = inarg; |
b6aeaded MS |
729 | req->in.args[1].size = count; |
730 | req->out.numargs = 1; | |
731 | req->out.args[0].size = sizeof(struct fuse_write_out); | |
b25e82e5 MS |
732 | req->out.args[0].value = outarg; |
733 | } | |
734 | ||
735 | static size_t fuse_send_write(struct fuse_req *req, struct file *file, | |
2106cb18 | 736 | loff_t pos, size_t count, fl_owner_t owner) |
b25e82e5 | 737 | { |
2106cb18 MS |
738 | struct fuse_file *ff = file->private_data; |
739 | struct fuse_conn *fc = ff->fc; | |
2d698b07 MS |
740 | struct fuse_write_in *inarg = &req->misc.write.in; |
741 | ||
2106cb18 | 742 | fuse_write_fill(req, ff, pos, count); |
2d698b07 | 743 | inarg->flags = file->f_flags; |
f3332114 | 744 | if (owner != NULL) { |
f3332114 MS |
745 | inarg->write_flags |= FUSE_WRITE_LOCKOWNER; |
746 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
747 | } | |
b93f858a | 748 | fuse_request_send(fc, req); |
b25e82e5 | 749 | return req->misc.write.out.size; |
b6aeaded MS |
750 | } |
751 | ||
5e6f58a1 NP |
752 | static int fuse_write_begin(struct file *file, struct address_space *mapping, |
753 | loff_t pos, unsigned len, unsigned flags, | |
754 | struct page **pagep, void **fsdata) | |
b6aeaded | 755 | { |
5e6f58a1 NP |
756 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
757 | ||
54566b2c | 758 | *pagep = grab_cache_page_write_begin(mapping, index, flags); |
5e6f58a1 NP |
759 | if (!*pagep) |
760 | return -ENOMEM; | |
b6aeaded MS |
761 | return 0; |
762 | } | |
763 | ||
a1d75f25 | 764 | void fuse_write_update_size(struct inode *inode, loff_t pos) |
854512ec MS |
765 | { |
766 | struct fuse_conn *fc = get_fuse_conn(inode); | |
767 | struct fuse_inode *fi = get_fuse_inode(inode); | |
768 | ||
769 | spin_lock(&fc->lock); | |
770 | fi->attr_version = ++fc->attr_version; | |
771 | if (pos > inode->i_size) | |
772 | i_size_write(inode, pos); | |
773 | spin_unlock(&fc->lock); | |
774 | } | |
775 | ||
5e6f58a1 NP |
776 | static int fuse_buffered_write(struct file *file, struct inode *inode, |
777 | loff_t pos, unsigned count, struct page *page) | |
b6aeaded MS |
778 | { |
779 | int err; | |
04730fef | 780 | size_t nres; |
b6aeaded | 781 | struct fuse_conn *fc = get_fuse_conn(inode); |
5e6f58a1 | 782 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
248d86e8 MS |
783 | struct fuse_req *req; |
784 | ||
785 | if (is_bad_inode(inode)) | |
786 | return -EIO; | |
787 | ||
3be5a52b MS |
788 | /* |
789 | * Make sure writepages on the same page are not mixed up with | |
790 | * plain writes. | |
791 | */ | |
792 | fuse_wait_on_page_writeback(inode, page->index); | |
793 | ||
ce1d5a49 MS |
794 | req = fuse_get_req(fc); |
795 | if (IS_ERR(req)) | |
796 | return PTR_ERR(req); | |
b6aeaded | 797 | |
f4975c67 | 798 | req->in.argpages = 1; |
b6aeaded MS |
799 | req->num_pages = 1; |
800 | req->pages[0] = page; | |
801 | req->page_offset = offset; | |
2106cb18 | 802 | nres = fuse_send_write(req, file, pos, count, NULL); |
b6aeaded MS |
803 | err = req->out.h.error; |
804 | fuse_put_request(fc, req); | |
5e6f58a1 | 805 | if (!err && !nres) |
b6aeaded MS |
806 | err = -EIO; |
807 | if (!err) { | |
5e6f58a1 | 808 | pos += nres; |
854512ec | 809 | fuse_write_update_size(inode, pos); |
5e6f58a1 | 810 | if (count == PAGE_CACHE_SIZE) |
b6aeaded | 811 | SetPageUptodate(page); |
b36c31ba MS |
812 | } |
813 | fuse_invalidate_attr(inode); | |
5e6f58a1 NP |
814 | return err ? err : nres; |
815 | } | |
816 | ||
817 | static int fuse_write_end(struct file *file, struct address_space *mapping, | |
818 | loff_t pos, unsigned len, unsigned copied, | |
819 | struct page *page, void *fsdata) | |
820 | { | |
821 | struct inode *inode = mapping->host; | |
822 | int res = 0; | |
823 | ||
824 | if (copied) | |
825 | res = fuse_buffered_write(file, inode, pos, copied, page); | |
826 | ||
827 | unlock_page(page); | |
828 | page_cache_release(page); | |
829 | return res; | |
b6aeaded MS |
830 | } |
831 | ||
ea9b9907 NP |
832 | static size_t fuse_send_write_pages(struct fuse_req *req, struct file *file, |
833 | struct inode *inode, loff_t pos, | |
834 | size_t count) | |
835 | { | |
836 | size_t res; | |
837 | unsigned offset; | |
838 | unsigned i; | |
839 | ||
840 | for (i = 0; i < req->num_pages; i++) | |
841 | fuse_wait_on_page_writeback(inode, req->pages[i]->index); | |
842 | ||
2106cb18 | 843 | res = fuse_send_write(req, file, pos, count, NULL); |
ea9b9907 NP |
844 | |
845 | offset = req->page_offset; | |
846 | count = res; | |
847 | for (i = 0; i < req->num_pages; i++) { | |
848 | struct page *page = req->pages[i]; | |
849 | ||
850 | if (!req->out.h.error && !offset && count >= PAGE_CACHE_SIZE) | |
851 | SetPageUptodate(page); | |
852 | ||
853 | if (count > PAGE_CACHE_SIZE - offset) | |
854 | count -= PAGE_CACHE_SIZE - offset; | |
855 | else | |
856 | count = 0; | |
857 | offset = 0; | |
858 | ||
859 | unlock_page(page); | |
860 | page_cache_release(page); | |
861 | } | |
862 | ||
863 | return res; | |
864 | } | |
865 | ||
866 | static ssize_t fuse_fill_write_pages(struct fuse_req *req, | |
867 | struct address_space *mapping, | |
868 | struct iov_iter *ii, loff_t pos) | |
869 | { | |
870 | struct fuse_conn *fc = get_fuse_conn(mapping->host); | |
871 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
872 | size_t count = 0; | |
873 | int err; | |
874 | ||
f4975c67 | 875 | req->in.argpages = 1; |
ea9b9907 NP |
876 | req->page_offset = offset; |
877 | ||
878 | do { | |
879 | size_t tmp; | |
880 | struct page *page; | |
881 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; | |
882 | size_t bytes = min_t(size_t, PAGE_CACHE_SIZE - offset, | |
883 | iov_iter_count(ii)); | |
884 | ||
885 | bytes = min_t(size_t, bytes, fc->max_write - count); | |
886 | ||
887 | again: | |
888 | err = -EFAULT; | |
889 | if (iov_iter_fault_in_readable(ii, bytes)) | |
890 | break; | |
891 | ||
892 | err = -ENOMEM; | |
54566b2c | 893 | page = grab_cache_page_write_begin(mapping, index, 0); |
ea9b9907 NP |
894 | if (!page) |
895 | break; | |
896 | ||
931e80e4 | 897 | if (mapping_writably_mapped(mapping)) |
898 | flush_dcache_page(page); | |
899 | ||
ea9b9907 NP |
900 | pagefault_disable(); |
901 | tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes); | |
902 | pagefault_enable(); | |
903 | flush_dcache_page(page); | |
904 | ||
905 | if (!tmp) { | |
906 | unlock_page(page); | |
907 | page_cache_release(page); | |
908 | bytes = min(bytes, iov_iter_single_seg_count(ii)); | |
909 | goto again; | |
910 | } | |
911 | ||
912 | err = 0; | |
913 | req->pages[req->num_pages] = page; | |
914 | req->num_pages++; | |
915 | ||
916 | iov_iter_advance(ii, tmp); | |
917 | count += tmp; | |
918 | pos += tmp; | |
919 | offset += tmp; | |
920 | if (offset == PAGE_CACHE_SIZE) | |
921 | offset = 0; | |
922 | ||
78bb6cb9 MS |
923 | if (!fc->big_writes) |
924 | break; | |
ea9b9907 NP |
925 | } while (iov_iter_count(ii) && count < fc->max_write && |
926 | req->num_pages < FUSE_MAX_PAGES_PER_REQ && offset == 0); | |
927 | ||
928 | return count > 0 ? count : err; | |
929 | } | |
930 | ||
931 | static ssize_t fuse_perform_write(struct file *file, | |
932 | struct address_space *mapping, | |
933 | struct iov_iter *ii, loff_t pos) | |
934 | { | |
935 | struct inode *inode = mapping->host; | |
936 | struct fuse_conn *fc = get_fuse_conn(inode); | |
937 | int err = 0; | |
938 | ssize_t res = 0; | |
939 | ||
940 | if (is_bad_inode(inode)) | |
941 | return -EIO; | |
942 | ||
943 | do { | |
944 | struct fuse_req *req; | |
945 | ssize_t count; | |
946 | ||
947 | req = fuse_get_req(fc); | |
948 | if (IS_ERR(req)) { | |
949 | err = PTR_ERR(req); | |
950 | break; | |
951 | } | |
952 | ||
953 | count = fuse_fill_write_pages(req, mapping, ii, pos); | |
954 | if (count <= 0) { | |
955 | err = count; | |
956 | } else { | |
957 | size_t num_written; | |
958 | ||
959 | num_written = fuse_send_write_pages(req, file, inode, | |
960 | pos, count); | |
961 | err = req->out.h.error; | |
962 | if (!err) { | |
963 | res += num_written; | |
964 | pos += num_written; | |
965 | ||
966 | /* break out of the loop on short write */ | |
967 | if (num_written != count) | |
968 | err = -EIO; | |
969 | } | |
970 | } | |
971 | fuse_put_request(fc, req); | |
972 | } while (!err && iov_iter_count(ii)); | |
973 | ||
974 | if (res > 0) | |
975 | fuse_write_update_size(inode, pos); | |
976 | ||
977 | fuse_invalidate_attr(inode); | |
978 | ||
979 | return res > 0 ? res : err; | |
980 | } | |
981 | ||
982 | static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
983 | unsigned long nr_segs, loff_t pos) | |
984 | { | |
985 | struct file *file = iocb->ki_filp; | |
986 | struct address_space *mapping = file->f_mapping; | |
987 | size_t count = 0; | |
988 | ssize_t written = 0; | |
989 | struct inode *inode = mapping->host; | |
990 | ssize_t err; | |
991 | struct iov_iter i; | |
992 | ||
993 | WARN_ON(iocb->ki_pos != pos); | |
994 | ||
995 | err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ); | |
996 | if (err) | |
997 | return err; | |
998 | ||
999 | mutex_lock(&inode->i_mutex); | |
1000 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); | |
1001 | ||
1002 | /* We can write back this queue in page reclaim */ | |
1003 | current->backing_dev_info = mapping->backing_dev_info; | |
1004 | ||
1005 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1006 | if (err) | |
1007 | goto out; | |
1008 | ||
1009 | if (count == 0) | |
1010 | goto out; | |
1011 | ||
2f1936b8 | 1012 | err = file_remove_suid(file); |
ea9b9907 NP |
1013 | if (err) |
1014 | goto out; | |
1015 | ||
1016 | file_update_time(file); | |
1017 | ||
1018 | iov_iter_init(&i, iov, nr_segs, count, 0); | |
1019 | written = fuse_perform_write(file, mapping, &i, pos); | |
1020 | if (written >= 0) | |
1021 | iocb->ki_pos = pos + written; | |
1022 | ||
1023 | out: | |
1024 | current->backing_dev_info = NULL; | |
1025 | mutex_unlock(&inode->i_mutex); | |
1026 | ||
1027 | return written ? written : err; | |
1028 | } | |
1029 | ||
413ef8cb MS |
1030 | static void fuse_release_user_pages(struct fuse_req *req, int write) |
1031 | { | |
1032 | unsigned i; | |
1033 | ||
1034 | for (i = 0; i < req->num_pages; i++) { | |
1035 | struct page *page = req->pages[i]; | |
1036 | if (write) | |
1037 | set_page_dirty_lock(page); | |
1038 | put_page(page); | |
1039 | } | |
1040 | } | |
1041 | ||
1042 | static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf, | |
ce60a2f1 | 1043 | size_t *nbytesp, int write) |
413ef8cb | 1044 | { |
ce60a2f1 | 1045 | size_t nbytes = *nbytesp; |
413ef8cb MS |
1046 | unsigned long user_addr = (unsigned long) buf; |
1047 | unsigned offset = user_addr & ~PAGE_MASK; | |
1048 | int npages; | |
1049 | ||
f4975c67 MS |
1050 | /* Special case for kernel I/O: can copy directly into the buffer */ |
1051 | if (segment_eq(get_fs(), KERNEL_DS)) { | |
1052 | if (write) | |
1053 | req->in.args[1].value = (void *) user_addr; | |
1054 | else | |
1055 | req->out.args[0].value = (void *) user_addr; | |
1056 | ||
1057 | return 0; | |
1058 | } | |
413ef8cb | 1059 | |
ce60a2f1 | 1060 | nbytes = min_t(size_t, nbytes, FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT); |
413ef8cb | 1061 | npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; |
bd730967 | 1062 | npages = clamp(npages, 1, FUSE_MAX_PAGES_PER_REQ); |
1bf94ca7 | 1063 | npages = get_user_pages_fast(user_addr, npages, !write, req->pages); |
413ef8cb MS |
1064 | if (npages < 0) |
1065 | return npages; | |
1066 | ||
1067 | req->num_pages = npages; | |
1068 | req->page_offset = offset; | |
f4975c67 MS |
1069 | |
1070 | if (write) | |
1071 | req->in.argpages = 1; | |
1072 | else | |
1073 | req->out.argpages = 1; | |
1074 | ||
1075 | nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset; | |
1076 | *nbytesp = min(*nbytesp, nbytes); | |
1077 | ||
413ef8cb MS |
1078 | return 0; |
1079 | } | |
1080 | ||
08cbf542 TH |
1081 | ssize_t fuse_direct_io(struct file *file, const char __user *buf, |
1082 | size_t count, loff_t *ppos, int write) | |
413ef8cb | 1083 | { |
2106cb18 MS |
1084 | struct fuse_file *ff = file->private_data; |
1085 | struct fuse_conn *fc = ff->fc; | |
413ef8cb MS |
1086 | size_t nmax = write ? fc->max_write : fc->max_read; |
1087 | loff_t pos = *ppos; | |
1088 | ssize_t res = 0; | |
248d86e8 MS |
1089 | struct fuse_req *req; |
1090 | ||
ce1d5a49 MS |
1091 | req = fuse_get_req(fc); |
1092 | if (IS_ERR(req)) | |
1093 | return PTR_ERR(req); | |
413ef8cb MS |
1094 | |
1095 | while (count) { | |
413ef8cb | 1096 | size_t nres; |
2106cb18 | 1097 | fl_owner_t owner = current->files; |
f4975c67 MS |
1098 | size_t nbytes = min(count, nmax); |
1099 | int err = fuse_get_user_pages(req, buf, &nbytes, write); | |
413ef8cb MS |
1100 | if (err) { |
1101 | res = err; | |
1102 | break; | |
1103 | } | |
f4975c67 | 1104 | |
413ef8cb | 1105 | if (write) |
2106cb18 | 1106 | nres = fuse_send_write(req, file, pos, nbytes, owner); |
413ef8cb | 1107 | else |
2106cb18 MS |
1108 | nres = fuse_send_read(req, file, pos, nbytes, owner); |
1109 | ||
413ef8cb MS |
1110 | fuse_release_user_pages(req, !write); |
1111 | if (req->out.h.error) { | |
1112 | if (!res) | |
1113 | res = req->out.h.error; | |
1114 | break; | |
1115 | } else if (nres > nbytes) { | |
1116 | res = -EIO; | |
1117 | break; | |
1118 | } | |
1119 | count -= nres; | |
1120 | res += nres; | |
1121 | pos += nres; | |
1122 | buf += nres; | |
1123 | if (nres != nbytes) | |
1124 | break; | |
56cf34ff MS |
1125 | if (count) { |
1126 | fuse_put_request(fc, req); | |
1127 | req = fuse_get_req(fc); | |
1128 | if (IS_ERR(req)) | |
1129 | break; | |
1130 | } | |
413ef8cb | 1131 | } |
f60311d5 AA |
1132 | if (!IS_ERR(req)) |
1133 | fuse_put_request(fc, req); | |
d09cb9d7 | 1134 | if (res > 0) |
413ef8cb | 1135 | *ppos = pos; |
413ef8cb MS |
1136 | |
1137 | return res; | |
1138 | } | |
08cbf542 | 1139 | EXPORT_SYMBOL_GPL(fuse_direct_io); |
413ef8cb MS |
1140 | |
1141 | static ssize_t fuse_direct_read(struct file *file, char __user *buf, | |
1142 | size_t count, loff_t *ppos) | |
1143 | { | |
d09cb9d7 MS |
1144 | ssize_t res; |
1145 | struct inode *inode = file->f_path.dentry->d_inode; | |
1146 | ||
1147 | if (is_bad_inode(inode)) | |
1148 | return -EIO; | |
1149 | ||
1150 | res = fuse_direct_io(file, buf, count, ppos, 0); | |
1151 | ||
1152 | fuse_invalidate_attr(inode); | |
1153 | ||
1154 | return res; | |
413ef8cb MS |
1155 | } |
1156 | ||
1157 | static ssize_t fuse_direct_write(struct file *file, const char __user *buf, | |
1158 | size_t count, loff_t *ppos) | |
1159 | { | |
7706a9d6 | 1160 | struct inode *inode = file->f_path.dentry->d_inode; |
413ef8cb | 1161 | ssize_t res; |
d09cb9d7 MS |
1162 | |
1163 | if (is_bad_inode(inode)) | |
1164 | return -EIO; | |
1165 | ||
413ef8cb | 1166 | /* Don't allow parallel writes to the same file */ |
1b1dcc1b | 1167 | mutex_lock(&inode->i_mutex); |
889f7848 | 1168 | res = generic_write_checks(file, ppos, &count, 0); |
d09cb9d7 | 1169 | if (!res) { |
889f7848 | 1170 | res = fuse_direct_io(file, buf, count, ppos, 1); |
d09cb9d7 MS |
1171 | if (res > 0) |
1172 | fuse_write_update_size(inode, *ppos); | |
1173 | } | |
1b1dcc1b | 1174 | mutex_unlock(&inode->i_mutex); |
d09cb9d7 MS |
1175 | |
1176 | fuse_invalidate_attr(inode); | |
1177 | ||
413ef8cb MS |
1178 | return res; |
1179 | } | |
1180 | ||
3be5a52b | 1181 | static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req) |
b6aeaded | 1182 | { |
3be5a52b | 1183 | __free_page(req->pages[0]); |
5a18ec17 | 1184 | fuse_file_put(req->ff, false); |
3be5a52b MS |
1185 | } |
1186 | ||
1187 | static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req) | |
1188 | { | |
1189 | struct inode *inode = req->inode; | |
1190 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1191 | struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info; | |
1192 | ||
1193 | list_del(&req->writepages_entry); | |
1194 | dec_bdi_stat(bdi, BDI_WRITEBACK); | |
1195 | dec_zone_page_state(req->pages[0], NR_WRITEBACK_TEMP); | |
1196 | bdi_writeout_inc(bdi); | |
1197 | wake_up(&fi->page_waitq); | |
1198 | } | |
1199 | ||
1200 | /* Called under fc->lock, may release and reacquire it */ | |
1201 | static void fuse_send_writepage(struct fuse_conn *fc, struct fuse_req *req) | |
b9ca67b2 MS |
1202 | __releases(fc->lock) |
1203 | __acquires(fc->lock) | |
3be5a52b MS |
1204 | { |
1205 | struct fuse_inode *fi = get_fuse_inode(req->inode); | |
1206 | loff_t size = i_size_read(req->inode); | |
1207 | struct fuse_write_in *inarg = &req->misc.write.in; | |
1208 | ||
1209 | if (!fc->connected) | |
1210 | goto out_free; | |
1211 | ||
1212 | if (inarg->offset + PAGE_CACHE_SIZE <= size) { | |
1213 | inarg->size = PAGE_CACHE_SIZE; | |
1214 | } else if (inarg->offset < size) { | |
1215 | inarg->size = size & (PAGE_CACHE_SIZE - 1); | |
1216 | } else { | |
1217 | /* Got truncated off completely */ | |
1218 | goto out_free; | |
b6aeaded | 1219 | } |
3be5a52b MS |
1220 | |
1221 | req->in.args[1].size = inarg->size; | |
1222 | fi->writectr++; | |
b93f858a | 1223 | fuse_request_send_background_locked(fc, req); |
3be5a52b MS |
1224 | return; |
1225 | ||
1226 | out_free: | |
1227 | fuse_writepage_finish(fc, req); | |
1228 | spin_unlock(&fc->lock); | |
1229 | fuse_writepage_free(fc, req); | |
e9bb09dd | 1230 | fuse_put_request(fc, req); |
3be5a52b | 1231 | spin_lock(&fc->lock); |
b6aeaded MS |
1232 | } |
1233 | ||
3be5a52b MS |
1234 | /* |
1235 | * If fi->writectr is positive (no truncate or fsync going on) send | |
1236 | * all queued writepage requests. | |
1237 | * | |
1238 | * Called with fc->lock | |
1239 | */ | |
1240 | void fuse_flush_writepages(struct inode *inode) | |
b9ca67b2 MS |
1241 | __releases(fc->lock) |
1242 | __acquires(fc->lock) | |
b6aeaded | 1243 | { |
3be5a52b MS |
1244 | struct fuse_conn *fc = get_fuse_conn(inode); |
1245 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1246 | struct fuse_req *req; | |
1247 | ||
1248 | while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) { | |
1249 | req = list_entry(fi->queued_writes.next, struct fuse_req, list); | |
1250 | list_del_init(&req->list); | |
1251 | fuse_send_writepage(fc, req); | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req) | |
1256 | { | |
1257 | struct inode *inode = req->inode; | |
1258 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1259 | ||
1260 | mapping_set_error(inode->i_mapping, req->out.h.error); | |
1261 | spin_lock(&fc->lock); | |
1262 | fi->writectr--; | |
1263 | fuse_writepage_finish(fc, req); | |
1264 | spin_unlock(&fc->lock); | |
1265 | fuse_writepage_free(fc, req); | |
1266 | } | |
1267 | ||
1268 | static int fuse_writepage_locked(struct page *page) | |
1269 | { | |
1270 | struct address_space *mapping = page->mapping; | |
1271 | struct inode *inode = mapping->host; | |
1272 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1273 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1274 | struct fuse_req *req; | |
1275 | struct fuse_file *ff; | |
1276 | struct page *tmp_page; | |
1277 | ||
1278 | set_page_writeback(page); | |
1279 | ||
1280 | req = fuse_request_alloc_nofs(); | |
1281 | if (!req) | |
1282 | goto err; | |
1283 | ||
1284 | tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
1285 | if (!tmp_page) | |
1286 | goto err_free; | |
1287 | ||
1288 | spin_lock(&fc->lock); | |
1289 | BUG_ON(list_empty(&fi->write_files)); | |
1290 | ff = list_entry(fi->write_files.next, struct fuse_file, write_entry); | |
1291 | req->ff = fuse_file_get(ff); | |
1292 | spin_unlock(&fc->lock); | |
1293 | ||
2106cb18 | 1294 | fuse_write_fill(req, ff, page_offset(page), 0); |
3be5a52b MS |
1295 | |
1296 | copy_highpage(tmp_page, page); | |
2d698b07 | 1297 | req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; |
f4975c67 | 1298 | req->in.argpages = 1; |
3be5a52b MS |
1299 | req->num_pages = 1; |
1300 | req->pages[0] = tmp_page; | |
1301 | req->page_offset = 0; | |
1302 | req->end = fuse_writepage_end; | |
1303 | req->inode = inode; | |
1304 | ||
1305 | inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK); | |
1306 | inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP); | |
1307 | end_page_writeback(page); | |
1308 | ||
1309 | spin_lock(&fc->lock); | |
1310 | list_add(&req->writepages_entry, &fi->writepages); | |
1311 | list_add_tail(&req->list, &fi->queued_writes); | |
1312 | fuse_flush_writepages(inode); | |
1313 | spin_unlock(&fc->lock); | |
1314 | ||
1315 | return 0; | |
1316 | ||
1317 | err_free: | |
1318 | fuse_request_free(req); | |
1319 | err: | |
1320 | end_page_writeback(page); | |
1321 | return -ENOMEM; | |
1322 | } | |
1323 | ||
1324 | static int fuse_writepage(struct page *page, struct writeback_control *wbc) | |
1325 | { | |
1326 | int err; | |
1327 | ||
1328 | err = fuse_writepage_locked(page); | |
1329 | unlock_page(page); | |
1330 | ||
1331 | return err; | |
1332 | } | |
1333 | ||
1334 | static int fuse_launder_page(struct page *page) | |
1335 | { | |
1336 | int err = 0; | |
1337 | if (clear_page_dirty_for_io(page)) { | |
1338 | struct inode *inode = page->mapping->host; | |
1339 | err = fuse_writepage_locked(page); | |
1340 | if (!err) | |
1341 | fuse_wait_on_page_writeback(inode, page->index); | |
1342 | } | |
1343 | return err; | |
1344 | } | |
1345 | ||
1346 | /* | |
1347 | * Write back dirty pages now, because there may not be any suitable | |
1348 | * open files later | |
1349 | */ | |
1350 | static void fuse_vma_close(struct vm_area_struct *vma) | |
1351 | { | |
1352 | filemap_write_and_wait(vma->vm_file->f_mapping); | |
1353 | } | |
1354 | ||
1355 | /* | |
1356 | * Wait for writeback against this page to complete before allowing it | |
1357 | * to be marked dirty again, and hence written back again, possibly | |
1358 | * before the previous writepage completed. | |
1359 | * | |
1360 | * Block here, instead of in ->writepage(), so that the userspace fs | |
1361 | * can only block processes actually operating on the filesystem. | |
1362 | * | |
1363 | * Otherwise unprivileged userspace fs would be able to block | |
1364 | * unrelated: | |
1365 | * | |
1366 | * - page migration | |
1367 | * - sync(2) | |
1368 | * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER | |
1369 | */ | |
c2ec175c | 1370 | static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
3be5a52b | 1371 | { |
c2ec175c | 1372 | struct page *page = vmf->page; |
3be5a52b MS |
1373 | /* |
1374 | * Don't use page->mapping as it may become NULL from a | |
1375 | * concurrent truncate. | |
1376 | */ | |
1377 | struct inode *inode = vma->vm_file->f_mapping->host; | |
1378 | ||
1379 | fuse_wait_on_page_writeback(inode, page->index); | |
1380 | return 0; | |
1381 | } | |
1382 | ||
f0f37e2f | 1383 | static const struct vm_operations_struct fuse_file_vm_ops = { |
3be5a52b MS |
1384 | .close = fuse_vma_close, |
1385 | .fault = filemap_fault, | |
1386 | .page_mkwrite = fuse_page_mkwrite, | |
1387 | }; | |
1388 | ||
1389 | static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1390 | { | |
1391 | if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) { | |
1392 | struct inode *inode = file->f_dentry->d_inode; | |
1393 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1394 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1395 | struct fuse_file *ff = file->private_data; | |
1396 | /* | |
1397 | * file may be written through mmap, so chain it onto the | |
1398 | * inodes's write_file list | |
1399 | */ | |
1400 | spin_lock(&fc->lock); | |
1401 | if (list_empty(&ff->write_entry)) | |
1402 | list_add(&ff->write_entry, &fi->write_files); | |
1403 | spin_unlock(&fc->lock); | |
1404 | } | |
1405 | file_accessed(file); | |
1406 | vma->vm_ops = &fuse_file_vm_ops; | |
b6aeaded MS |
1407 | return 0; |
1408 | } | |
1409 | ||
fc280c96 MS |
1410 | static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma) |
1411 | { | |
1412 | /* Can't provide the coherency needed for MAP_SHARED */ | |
1413 | if (vma->vm_flags & VM_MAYSHARE) | |
1414 | return -ENODEV; | |
1415 | ||
3121bfe7 MS |
1416 | invalidate_inode_pages2(file->f_mapping); |
1417 | ||
fc280c96 MS |
1418 | return generic_file_mmap(file, vma); |
1419 | } | |
1420 | ||
71421259 MS |
1421 | static int convert_fuse_file_lock(const struct fuse_file_lock *ffl, |
1422 | struct file_lock *fl) | |
1423 | { | |
1424 | switch (ffl->type) { | |
1425 | case F_UNLCK: | |
1426 | break; | |
1427 | ||
1428 | case F_RDLCK: | |
1429 | case F_WRLCK: | |
1430 | if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX || | |
1431 | ffl->end < ffl->start) | |
1432 | return -EIO; | |
1433 | ||
1434 | fl->fl_start = ffl->start; | |
1435 | fl->fl_end = ffl->end; | |
1436 | fl->fl_pid = ffl->pid; | |
1437 | break; | |
1438 | ||
1439 | default: | |
1440 | return -EIO; | |
1441 | } | |
1442 | fl->fl_type = ffl->type; | |
1443 | return 0; | |
1444 | } | |
1445 | ||
1446 | static void fuse_lk_fill(struct fuse_req *req, struct file *file, | |
a9ff4f87 MS |
1447 | const struct file_lock *fl, int opcode, pid_t pid, |
1448 | int flock) | |
71421259 | 1449 | { |
7706a9d6 | 1450 | struct inode *inode = file->f_path.dentry->d_inode; |
9c8ef561 | 1451 | struct fuse_conn *fc = get_fuse_conn(inode); |
71421259 MS |
1452 | struct fuse_file *ff = file->private_data; |
1453 | struct fuse_lk_in *arg = &req->misc.lk_in; | |
1454 | ||
1455 | arg->fh = ff->fh; | |
9c8ef561 | 1456 | arg->owner = fuse_lock_owner_id(fc, fl->fl_owner); |
71421259 MS |
1457 | arg->lk.start = fl->fl_start; |
1458 | arg->lk.end = fl->fl_end; | |
1459 | arg->lk.type = fl->fl_type; | |
1460 | arg->lk.pid = pid; | |
a9ff4f87 MS |
1461 | if (flock) |
1462 | arg->lk_flags |= FUSE_LK_FLOCK; | |
71421259 MS |
1463 | req->in.h.opcode = opcode; |
1464 | req->in.h.nodeid = get_node_id(inode); | |
1465 | req->in.numargs = 1; | |
1466 | req->in.args[0].size = sizeof(*arg); | |
1467 | req->in.args[0].value = arg; | |
1468 | } | |
1469 | ||
1470 | static int fuse_getlk(struct file *file, struct file_lock *fl) | |
1471 | { | |
7706a9d6 | 1472 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1473 | struct fuse_conn *fc = get_fuse_conn(inode); |
1474 | struct fuse_req *req; | |
1475 | struct fuse_lk_out outarg; | |
1476 | int err; | |
1477 | ||
1478 | req = fuse_get_req(fc); | |
1479 | if (IS_ERR(req)) | |
1480 | return PTR_ERR(req); | |
1481 | ||
a9ff4f87 | 1482 | fuse_lk_fill(req, file, fl, FUSE_GETLK, 0, 0); |
71421259 MS |
1483 | req->out.numargs = 1; |
1484 | req->out.args[0].size = sizeof(outarg); | |
1485 | req->out.args[0].value = &outarg; | |
b93f858a | 1486 | fuse_request_send(fc, req); |
71421259 MS |
1487 | err = req->out.h.error; |
1488 | fuse_put_request(fc, req); | |
1489 | if (!err) | |
1490 | err = convert_fuse_file_lock(&outarg.lk, fl); | |
1491 | ||
1492 | return err; | |
1493 | } | |
1494 | ||
a9ff4f87 | 1495 | static int fuse_setlk(struct file *file, struct file_lock *fl, int flock) |
71421259 | 1496 | { |
7706a9d6 | 1497 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1498 | struct fuse_conn *fc = get_fuse_conn(inode); |
1499 | struct fuse_req *req; | |
1500 | int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK; | |
1501 | pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0; | |
1502 | int err; | |
1503 | ||
48e90761 MS |
1504 | if (fl->fl_lmops && fl->fl_lmops->fl_grant) { |
1505 | /* NLM needs asynchronous locks, which we don't support yet */ | |
1506 | return -ENOLCK; | |
1507 | } | |
1508 | ||
71421259 MS |
1509 | /* Unlock on close is handled by the flush method */ |
1510 | if (fl->fl_flags & FL_CLOSE) | |
1511 | return 0; | |
1512 | ||
1513 | req = fuse_get_req(fc); | |
1514 | if (IS_ERR(req)) | |
1515 | return PTR_ERR(req); | |
1516 | ||
a9ff4f87 | 1517 | fuse_lk_fill(req, file, fl, opcode, pid, flock); |
b93f858a | 1518 | fuse_request_send(fc, req); |
71421259 | 1519 | err = req->out.h.error; |
a4d27e75 MS |
1520 | /* locking is restartable */ |
1521 | if (err == -EINTR) | |
1522 | err = -ERESTARTSYS; | |
71421259 MS |
1523 | fuse_put_request(fc, req); |
1524 | return err; | |
1525 | } | |
1526 | ||
1527 | static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) | |
1528 | { | |
7706a9d6 | 1529 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1530 | struct fuse_conn *fc = get_fuse_conn(inode); |
1531 | int err; | |
1532 | ||
48e90761 MS |
1533 | if (cmd == F_CANCELLK) { |
1534 | err = 0; | |
1535 | } else if (cmd == F_GETLK) { | |
71421259 | 1536 | if (fc->no_lock) { |
9d6a8c5c | 1537 | posix_test_lock(file, fl); |
71421259 MS |
1538 | err = 0; |
1539 | } else | |
1540 | err = fuse_getlk(file, fl); | |
1541 | } else { | |
1542 | if (fc->no_lock) | |
48e90761 | 1543 | err = posix_lock_file(file, fl, NULL); |
71421259 | 1544 | else |
a9ff4f87 | 1545 | err = fuse_setlk(file, fl, 0); |
71421259 MS |
1546 | } |
1547 | return err; | |
1548 | } | |
1549 | ||
a9ff4f87 MS |
1550 | static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl) |
1551 | { | |
1552 | struct inode *inode = file->f_path.dentry->d_inode; | |
1553 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1554 | int err; | |
1555 | ||
37fb3a30 | 1556 | if (fc->no_flock) { |
a9ff4f87 MS |
1557 | err = flock_lock_file_wait(file, fl); |
1558 | } else { | |
37fb3a30 MS |
1559 | struct fuse_file *ff = file->private_data; |
1560 | ||
a9ff4f87 MS |
1561 | /* emulate flock with POSIX locks */ |
1562 | fl->fl_owner = (fl_owner_t) file; | |
37fb3a30 | 1563 | ff->flock = true; |
a9ff4f87 MS |
1564 | err = fuse_setlk(file, fl, 1); |
1565 | } | |
1566 | ||
1567 | return err; | |
1568 | } | |
1569 | ||
b2d2272f MS |
1570 | static sector_t fuse_bmap(struct address_space *mapping, sector_t block) |
1571 | { | |
1572 | struct inode *inode = mapping->host; | |
1573 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1574 | struct fuse_req *req; | |
1575 | struct fuse_bmap_in inarg; | |
1576 | struct fuse_bmap_out outarg; | |
1577 | int err; | |
1578 | ||
1579 | if (!inode->i_sb->s_bdev || fc->no_bmap) | |
1580 | return 0; | |
1581 | ||
1582 | req = fuse_get_req(fc); | |
1583 | if (IS_ERR(req)) | |
1584 | return 0; | |
1585 | ||
1586 | memset(&inarg, 0, sizeof(inarg)); | |
1587 | inarg.block = block; | |
1588 | inarg.blocksize = inode->i_sb->s_blocksize; | |
1589 | req->in.h.opcode = FUSE_BMAP; | |
1590 | req->in.h.nodeid = get_node_id(inode); | |
1591 | req->in.numargs = 1; | |
1592 | req->in.args[0].size = sizeof(inarg); | |
1593 | req->in.args[0].value = &inarg; | |
1594 | req->out.numargs = 1; | |
1595 | req->out.args[0].size = sizeof(outarg); | |
1596 | req->out.args[0].value = &outarg; | |
b93f858a | 1597 | fuse_request_send(fc, req); |
b2d2272f MS |
1598 | err = req->out.h.error; |
1599 | fuse_put_request(fc, req); | |
1600 | if (err == -ENOSYS) | |
1601 | fc->no_bmap = 1; | |
1602 | ||
1603 | return err ? 0 : outarg.block; | |
1604 | } | |
1605 | ||
5559b8f4 MS |
1606 | static loff_t fuse_file_llseek(struct file *file, loff_t offset, int origin) |
1607 | { | |
1608 | loff_t retval; | |
1609 | struct inode *inode = file->f_path.dentry->d_inode; | |
1610 | ||
1611 | mutex_lock(&inode->i_mutex); | |
1612 | switch (origin) { | |
1613 | case SEEK_END: | |
769415c6 MS |
1614 | retval = fuse_update_attributes(inode, NULL, file, NULL); |
1615 | if (retval) | |
5291658d | 1616 | goto exit; |
5559b8f4 MS |
1617 | offset += i_size_read(inode); |
1618 | break; | |
1619 | case SEEK_CUR: | |
1620 | offset += file->f_pos; | |
1621 | } | |
1622 | retval = -EINVAL; | |
1623 | if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { | |
1624 | if (offset != file->f_pos) { | |
1625 | file->f_pos = offset; | |
1626 | file->f_version = 0; | |
1627 | } | |
1628 | retval = offset; | |
1629 | } | |
5291658d | 1630 | exit: |
5559b8f4 MS |
1631 | mutex_unlock(&inode->i_mutex); |
1632 | return retval; | |
1633 | } | |
1634 | ||
59efec7b TH |
1635 | static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov, |
1636 | unsigned int nr_segs, size_t bytes, bool to_user) | |
1637 | { | |
1638 | struct iov_iter ii; | |
1639 | int page_idx = 0; | |
1640 | ||
1641 | if (!bytes) | |
1642 | return 0; | |
1643 | ||
1644 | iov_iter_init(&ii, iov, nr_segs, bytes, 0); | |
1645 | ||
1646 | while (iov_iter_count(&ii)) { | |
1647 | struct page *page = pages[page_idx++]; | |
1648 | size_t todo = min_t(size_t, PAGE_SIZE, iov_iter_count(&ii)); | |
4aa0edd2 | 1649 | void *kaddr; |
59efec7b | 1650 | |
4aa0edd2 | 1651 | kaddr = kmap(page); |
59efec7b TH |
1652 | |
1653 | while (todo) { | |
1654 | char __user *uaddr = ii.iov->iov_base + ii.iov_offset; | |
1655 | size_t iov_len = ii.iov->iov_len - ii.iov_offset; | |
1656 | size_t copy = min(todo, iov_len); | |
1657 | size_t left; | |
1658 | ||
1659 | if (!to_user) | |
1660 | left = copy_from_user(kaddr, uaddr, copy); | |
1661 | else | |
1662 | left = copy_to_user(uaddr, kaddr, copy); | |
1663 | ||
1664 | if (unlikely(left)) | |
1665 | return -EFAULT; | |
1666 | ||
1667 | iov_iter_advance(&ii, copy); | |
1668 | todo -= copy; | |
1669 | kaddr += copy; | |
1670 | } | |
1671 | ||
0bd87182 | 1672 | kunmap(page); |
59efec7b TH |
1673 | } |
1674 | ||
1675 | return 0; | |
1676 | } | |
1677 | ||
d9d318d3 MS |
1678 | /* |
1679 | * CUSE servers compiled on 32bit broke on 64bit kernels because the | |
1680 | * ABI was defined to be 'struct iovec' which is different on 32bit | |
1681 | * and 64bit. Fortunately we can determine which structure the server | |
1682 | * used from the size of the reply. | |
1683 | */ | |
1baa26b2 MS |
1684 | static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src, |
1685 | size_t transferred, unsigned count, | |
1686 | bool is_compat) | |
d9d318d3 MS |
1687 | { |
1688 | #ifdef CONFIG_COMPAT | |
1689 | if (count * sizeof(struct compat_iovec) == transferred) { | |
1690 | struct compat_iovec *ciov = src; | |
1691 | unsigned i; | |
1692 | ||
1693 | /* | |
1694 | * With this interface a 32bit server cannot support | |
1695 | * non-compat (i.e. ones coming from 64bit apps) ioctl | |
1696 | * requests | |
1697 | */ | |
1698 | if (!is_compat) | |
1699 | return -EINVAL; | |
1700 | ||
1701 | for (i = 0; i < count; i++) { | |
1702 | dst[i].iov_base = compat_ptr(ciov[i].iov_base); | |
1703 | dst[i].iov_len = ciov[i].iov_len; | |
1704 | } | |
1705 | return 0; | |
1706 | } | |
1707 | #endif | |
1708 | ||
1709 | if (count * sizeof(struct iovec) != transferred) | |
1710 | return -EIO; | |
1711 | ||
1712 | memcpy(dst, src, transferred); | |
1713 | return 0; | |
1714 | } | |
1715 | ||
7572777e MS |
1716 | /* Make sure iov_length() won't overflow */ |
1717 | static int fuse_verify_ioctl_iov(struct iovec *iov, size_t count) | |
1718 | { | |
1719 | size_t n; | |
1720 | u32 max = FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT; | |
1721 | ||
1722 | for (n = 0; n < count; n++) { | |
1723 | if (iov->iov_len > (size_t) max) | |
1724 | return -ENOMEM; | |
1725 | max -= iov->iov_len; | |
1726 | } | |
1727 | return 0; | |
1728 | } | |
1729 | ||
1baa26b2 MS |
1730 | static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst, |
1731 | void *src, size_t transferred, unsigned count, | |
1732 | bool is_compat) | |
1733 | { | |
1734 | unsigned i; | |
1735 | struct fuse_ioctl_iovec *fiov = src; | |
1736 | ||
1737 | if (fc->minor < 16) { | |
1738 | return fuse_copy_ioctl_iovec_old(dst, src, transferred, | |
1739 | count, is_compat); | |
1740 | } | |
1741 | ||
1742 | if (count * sizeof(struct fuse_ioctl_iovec) != transferred) | |
1743 | return -EIO; | |
1744 | ||
1745 | for (i = 0; i < count; i++) { | |
1746 | /* Did the server supply an inappropriate value? */ | |
1747 | if (fiov[i].base != (unsigned long) fiov[i].base || | |
1748 | fiov[i].len != (unsigned long) fiov[i].len) | |
1749 | return -EIO; | |
1750 | ||
1751 | dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base; | |
1752 | dst[i].iov_len = (size_t) fiov[i].len; | |
1753 | ||
1754 | #ifdef CONFIG_COMPAT | |
1755 | if (is_compat && | |
1756 | (ptr_to_compat(dst[i].iov_base) != fiov[i].base || | |
1757 | (compat_size_t) dst[i].iov_len != fiov[i].len)) | |
1758 | return -EIO; | |
1759 | #endif | |
1760 | } | |
1761 | ||
1762 | return 0; | |
1763 | } | |
1764 | ||
1765 | ||
59efec7b TH |
1766 | /* |
1767 | * For ioctls, there is no generic way to determine how much memory | |
1768 | * needs to be read and/or written. Furthermore, ioctls are allowed | |
1769 | * to dereference the passed pointer, so the parameter requires deep | |
1770 | * copying but FUSE has no idea whatsoever about what to copy in or | |
1771 | * out. | |
1772 | * | |
1773 | * This is solved by allowing FUSE server to retry ioctl with | |
1774 | * necessary in/out iovecs. Let's assume the ioctl implementation | |
1775 | * needs to read in the following structure. | |
1776 | * | |
1777 | * struct a { | |
1778 | * char *buf; | |
1779 | * size_t buflen; | |
1780 | * } | |
1781 | * | |
1782 | * On the first callout to FUSE server, inarg->in_size and | |
1783 | * inarg->out_size will be NULL; then, the server completes the ioctl | |
1784 | * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and | |
1785 | * the actual iov array to | |
1786 | * | |
1787 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } } | |
1788 | * | |
1789 | * which tells FUSE to copy in the requested area and retry the ioctl. | |
1790 | * On the second round, the server has access to the structure and | |
1791 | * from that it can tell what to look for next, so on the invocation, | |
1792 | * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to | |
1793 | * | |
1794 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) }, | |
1795 | * { .iov_base = a.buf, .iov_len = a.buflen } } | |
1796 | * | |
1797 | * FUSE will copy both struct a and the pointed buffer from the | |
1798 | * process doing the ioctl and retry ioctl with both struct a and the | |
1799 | * buffer. | |
1800 | * | |
1801 | * This time, FUSE server has everything it needs and completes ioctl | |
1802 | * without FUSE_IOCTL_RETRY which finishes the ioctl call. | |
1803 | * | |
1804 | * Copying data out works the same way. | |
1805 | * | |
1806 | * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel | |
1807 | * automatically initializes in and out iovs by decoding @cmd with | |
1808 | * _IOC_* macros and the server is not allowed to request RETRY. This | |
1809 | * limits ioctl data transfers to well-formed ioctls and is the forced | |
1810 | * behavior for all FUSE servers. | |
1811 | */ | |
08cbf542 TH |
1812 | long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, |
1813 | unsigned int flags) | |
59efec7b | 1814 | { |
59efec7b | 1815 | struct fuse_file *ff = file->private_data; |
d36f2487 | 1816 | struct fuse_conn *fc = ff->fc; |
59efec7b TH |
1817 | struct fuse_ioctl_in inarg = { |
1818 | .fh = ff->fh, | |
1819 | .cmd = cmd, | |
1820 | .arg = arg, | |
1821 | .flags = flags | |
1822 | }; | |
1823 | struct fuse_ioctl_out outarg; | |
1824 | struct fuse_req *req = NULL; | |
1825 | struct page **pages = NULL; | |
8ac83505 | 1826 | struct iovec *iov_page = NULL; |
59efec7b TH |
1827 | struct iovec *in_iov = NULL, *out_iov = NULL; |
1828 | unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages; | |
1829 | size_t in_size, out_size, transferred; | |
1830 | int err; | |
1831 | ||
1baa26b2 MS |
1832 | #if BITS_PER_LONG == 32 |
1833 | inarg.flags |= FUSE_IOCTL_32BIT; | |
1834 | #else | |
1835 | if (flags & FUSE_IOCTL_COMPAT) | |
1836 | inarg.flags |= FUSE_IOCTL_32BIT; | |
1837 | #endif | |
1838 | ||
59efec7b | 1839 | /* assume all the iovs returned by client always fits in a page */ |
1baa26b2 | 1840 | BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE); |
59efec7b | 1841 | |
59efec7b TH |
1842 | err = -ENOMEM; |
1843 | pages = kzalloc(sizeof(pages[0]) * FUSE_MAX_PAGES_PER_REQ, GFP_KERNEL); | |
8ac83505 | 1844 | iov_page = (struct iovec *) __get_free_page(GFP_KERNEL); |
59efec7b TH |
1845 | if (!pages || !iov_page) |
1846 | goto out; | |
1847 | ||
1848 | /* | |
1849 | * If restricted, initialize IO parameters as encoded in @cmd. | |
1850 | * RETRY from server is not allowed. | |
1851 | */ | |
1852 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) { | |
8ac83505 | 1853 | struct iovec *iov = iov_page; |
59efec7b | 1854 | |
c9f0523d | 1855 | iov->iov_base = (void __user *)arg; |
59efec7b TH |
1856 | iov->iov_len = _IOC_SIZE(cmd); |
1857 | ||
1858 | if (_IOC_DIR(cmd) & _IOC_WRITE) { | |
1859 | in_iov = iov; | |
1860 | in_iovs = 1; | |
1861 | } | |
1862 | ||
1863 | if (_IOC_DIR(cmd) & _IOC_READ) { | |
1864 | out_iov = iov; | |
1865 | out_iovs = 1; | |
1866 | } | |
1867 | } | |
1868 | ||
1869 | retry: | |
1870 | inarg.in_size = in_size = iov_length(in_iov, in_iovs); | |
1871 | inarg.out_size = out_size = iov_length(out_iov, out_iovs); | |
1872 | ||
1873 | /* | |
1874 | * Out data can be used either for actual out data or iovs, | |
1875 | * make sure there always is at least one page. | |
1876 | */ | |
1877 | out_size = max_t(size_t, out_size, PAGE_SIZE); | |
1878 | max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE); | |
1879 | ||
1880 | /* make sure there are enough buffer pages and init request with them */ | |
1881 | err = -ENOMEM; | |
1882 | if (max_pages > FUSE_MAX_PAGES_PER_REQ) | |
1883 | goto out; | |
1884 | while (num_pages < max_pages) { | |
1885 | pages[num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM); | |
1886 | if (!pages[num_pages]) | |
1887 | goto out; | |
1888 | num_pages++; | |
1889 | } | |
1890 | ||
1891 | req = fuse_get_req(fc); | |
1892 | if (IS_ERR(req)) { | |
1893 | err = PTR_ERR(req); | |
1894 | req = NULL; | |
1895 | goto out; | |
1896 | } | |
1897 | memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages); | |
1898 | req->num_pages = num_pages; | |
1899 | ||
1900 | /* okay, let's send it to the client */ | |
1901 | req->in.h.opcode = FUSE_IOCTL; | |
d36f2487 | 1902 | req->in.h.nodeid = ff->nodeid; |
59efec7b TH |
1903 | req->in.numargs = 1; |
1904 | req->in.args[0].size = sizeof(inarg); | |
1905 | req->in.args[0].value = &inarg; | |
1906 | if (in_size) { | |
1907 | req->in.numargs++; | |
1908 | req->in.args[1].size = in_size; | |
1909 | req->in.argpages = 1; | |
1910 | ||
1911 | err = fuse_ioctl_copy_user(pages, in_iov, in_iovs, in_size, | |
1912 | false); | |
1913 | if (err) | |
1914 | goto out; | |
1915 | } | |
1916 | ||
1917 | req->out.numargs = 2; | |
1918 | req->out.args[0].size = sizeof(outarg); | |
1919 | req->out.args[0].value = &outarg; | |
1920 | req->out.args[1].size = out_size; | |
1921 | req->out.argpages = 1; | |
1922 | req->out.argvar = 1; | |
1923 | ||
b93f858a | 1924 | fuse_request_send(fc, req); |
59efec7b TH |
1925 | err = req->out.h.error; |
1926 | transferred = req->out.args[1].size; | |
1927 | fuse_put_request(fc, req); | |
1928 | req = NULL; | |
1929 | if (err) | |
1930 | goto out; | |
1931 | ||
1932 | /* did it ask for retry? */ | |
1933 | if (outarg.flags & FUSE_IOCTL_RETRY) { | |
8ac83505 | 1934 | void *vaddr; |
59efec7b TH |
1935 | |
1936 | /* no retry if in restricted mode */ | |
1937 | err = -EIO; | |
1938 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) | |
1939 | goto out; | |
1940 | ||
1941 | in_iovs = outarg.in_iovs; | |
1942 | out_iovs = outarg.out_iovs; | |
1943 | ||
1944 | /* | |
1945 | * Make sure things are in boundary, separate checks | |
1946 | * are to protect against overflow. | |
1947 | */ | |
1948 | err = -ENOMEM; | |
1949 | if (in_iovs > FUSE_IOCTL_MAX_IOV || | |
1950 | out_iovs > FUSE_IOCTL_MAX_IOV || | |
1951 | in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV) | |
1952 | goto out; | |
1953 | ||
59efec7b | 1954 | vaddr = kmap_atomic(pages[0], KM_USER0); |
1baa26b2 | 1955 | err = fuse_copy_ioctl_iovec(fc, iov_page, vaddr, |
d9d318d3 MS |
1956 | transferred, in_iovs + out_iovs, |
1957 | (flags & FUSE_IOCTL_COMPAT) != 0); | |
59efec7b | 1958 | kunmap_atomic(vaddr, KM_USER0); |
d9d318d3 MS |
1959 | if (err) |
1960 | goto out; | |
59efec7b | 1961 | |
8ac83505 | 1962 | in_iov = iov_page; |
59efec7b TH |
1963 | out_iov = in_iov + in_iovs; |
1964 | ||
7572777e MS |
1965 | err = fuse_verify_ioctl_iov(in_iov, in_iovs); |
1966 | if (err) | |
1967 | goto out; | |
1968 | ||
1969 | err = fuse_verify_ioctl_iov(out_iov, out_iovs); | |
1970 | if (err) | |
1971 | goto out; | |
1972 | ||
59efec7b TH |
1973 | goto retry; |
1974 | } | |
1975 | ||
1976 | err = -EIO; | |
1977 | if (transferred > inarg.out_size) | |
1978 | goto out; | |
1979 | ||
1980 | err = fuse_ioctl_copy_user(pages, out_iov, out_iovs, transferred, true); | |
1981 | out: | |
1982 | if (req) | |
1983 | fuse_put_request(fc, req); | |
8ac83505 | 1984 | free_page((unsigned long) iov_page); |
59efec7b TH |
1985 | while (num_pages) |
1986 | __free_page(pages[--num_pages]); | |
1987 | kfree(pages); | |
1988 | ||
1989 | return err ? err : outarg.result; | |
1990 | } | |
08cbf542 | 1991 | EXPORT_SYMBOL_GPL(fuse_do_ioctl); |
59efec7b | 1992 | |
d36f2487 MS |
1993 | static long fuse_file_ioctl_common(struct file *file, unsigned int cmd, |
1994 | unsigned long arg, unsigned int flags) | |
1995 | { | |
1996 | struct inode *inode = file->f_dentry->d_inode; | |
1997 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1998 | ||
1999 | if (!fuse_allow_task(fc, current)) | |
2000 | return -EACCES; | |
2001 | ||
2002 | if (is_bad_inode(inode)) | |
2003 | return -EIO; | |
2004 | ||
2005 | return fuse_do_ioctl(file, cmd, arg, flags); | |
2006 | } | |
2007 | ||
59efec7b TH |
2008 | static long fuse_file_ioctl(struct file *file, unsigned int cmd, |
2009 | unsigned long arg) | |
2010 | { | |
d36f2487 | 2011 | return fuse_file_ioctl_common(file, cmd, arg, 0); |
59efec7b TH |
2012 | } |
2013 | ||
2014 | static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd, | |
2015 | unsigned long arg) | |
2016 | { | |
d36f2487 | 2017 | return fuse_file_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT); |
59efec7b TH |
2018 | } |
2019 | ||
95668a69 TH |
2020 | /* |
2021 | * All files which have been polled are linked to RB tree | |
2022 | * fuse_conn->polled_files which is indexed by kh. Walk the tree and | |
2023 | * find the matching one. | |
2024 | */ | |
2025 | static struct rb_node **fuse_find_polled_node(struct fuse_conn *fc, u64 kh, | |
2026 | struct rb_node **parent_out) | |
2027 | { | |
2028 | struct rb_node **link = &fc->polled_files.rb_node; | |
2029 | struct rb_node *last = NULL; | |
2030 | ||
2031 | while (*link) { | |
2032 | struct fuse_file *ff; | |
2033 | ||
2034 | last = *link; | |
2035 | ff = rb_entry(last, struct fuse_file, polled_node); | |
2036 | ||
2037 | if (kh < ff->kh) | |
2038 | link = &last->rb_left; | |
2039 | else if (kh > ff->kh) | |
2040 | link = &last->rb_right; | |
2041 | else | |
2042 | return link; | |
2043 | } | |
2044 | ||
2045 | if (parent_out) | |
2046 | *parent_out = last; | |
2047 | return link; | |
2048 | } | |
2049 | ||
2050 | /* | |
2051 | * The file is about to be polled. Make sure it's on the polled_files | |
2052 | * RB tree. Note that files once added to the polled_files tree are | |
2053 | * not removed before the file is released. This is because a file | |
2054 | * polled once is likely to be polled again. | |
2055 | */ | |
2056 | static void fuse_register_polled_file(struct fuse_conn *fc, | |
2057 | struct fuse_file *ff) | |
2058 | { | |
2059 | spin_lock(&fc->lock); | |
2060 | if (RB_EMPTY_NODE(&ff->polled_node)) { | |
2061 | struct rb_node **link, *parent; | |
2062 | ||
2063 | link = fuse_find_polled_node(fc, ff->kh, &parent); | |
2064 | BUG_ON(*link); | |
2065 | rb_link_node(&ff->polled_node, parent, link); | |
2066 | rb_insert_color(&ff->polled_node, &fc->polled_files); | |
2067 | } | |
2068 | spin_unlock(&fc->lock); | |
2069 | } | |
2070 | ||
08cbf542 | 2071 | unsigned fuse_file_poll(struct file *file, poll_table *wait) |
95668a69 | 2072 | { |
95668a69 | 2073 | struct fuse_file *ff = file->private_data; |
797759aa | 2074 | struct fuse_conn *fc = ff->fc; |
95668a69 TH |
2075 | struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh }; |
2076 | struct fuse_poll_out outarg; | |
2077 | struct fuse_req *req; | |
2078 | int err; | |
2079 | ||
2080 | if (fc->no_poll) | |
2081 | return DEFAULT_POLLMASK; | |
2082 | ||
2083 | poll_wait(file, &ff->poll_wait, wait); | |
2084 | ||
2085 | /* | |
2086 | * Ask for notification iff there's someone waiting for it. | |
2087 | * The client may ignore the flag and always notify. | |
2088 | */ | |
2089 | if (waitqueue_active(&ff->poll_wait)) { | |
2090 | inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY; | |
2091 | fuse_register_polled_file(fc, ff); | |
2092 | } | |
2093 | ||
2094 | req = fuse_get_req(fc); | |
2095 | if (IS_ERR(req)) | |
201fa69a | 2096 | return POLLERR; |
95668a69 TH |
2097 | |
2098 | req->in.h.opcode = FUSE_POLL; | |
797759aa | 2099 | req->in.h.nodeid = ff->nodeid; |
95668a69 TH |
2100 | req->in.numargs = 1; |
2101 | req->in.args[0].size = sizeof(inarg); | |
2102 | req->in.args[0].value = &inarg; | |
2103 | req->out.numargs = 1; | |
2104 | req->out.args[0].size = sizeof(outarg); | |
2105 | req->out.args[0].value = &outarg; | |
b93f858a | 2106 | fuse_request_send(fc, req); |
95668a69 TH |
2107 | err = req->out.h.error; |
2108 | fuse_put_request(fc, req); | |
2109 | ||
2110 | if (!err) | |
2111 | return outarg.revents; | |
2112 | if (err == -ENOSYS) { | |
2113 | fc->no_poll = 1; | |
2114 | return DEFAULT_POLLMASK; | |
2115 | } | |
2116 | return POLLERR; | |
2117 | } | |
08cbf542 | 2118 | EXPORT_SYMBOL_GPL(fuse_file_poll); |
95668a69 TH |
2119 | |
2120 | /* | |
2121 | * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and | |
2122 | * wakes up the poll waiters. | |
2123 | */ | |
2124 | int fuse_notify_poll_wakeup(struct fuse_conn *fc, | |
2125 | struct fuse_notify_poll_wakeup_out *outarg) | |
2126 | { | |
2127 | u64 kh = outarg->kh; | |
2128 | struct rb_node **link; | |
2129 | ||
2130 | spin_lock(&fc->lock); | |
2131 | ||
2132 | link = fuse_find_polled_node(fc, kh, NULL); | |
2133 | if (*link) { | |
2134 | struct fuse_file *ff; | |
2135 | ||
2136 | ff = rb_entry(*link, struct fuse_file, polled_node); | |
2137 | wake_up_interruptible_sync(&ff->poll_wait); | |
2138 | } | |
2139 | ||
2140 | spin_unlock(&fc->lock); | |
2141 | return 0; | |
2142 | } | |
2143 | ||
4b6f5d20 | 2144 | static const struct file_operations fuse_file_operations = { |
5559b8f4 | 2145 | .llseek = fuse_file_llseek, |
543ade1f | 2146 | .read = do_sync_read, |
bcb4be80 | 2147 | .aio_read = fuse_file_aio_read, |
543ade1f | 2148 | .write = do_sync_write, |
ea9b9907 | 2149 | .aio_write = fuse_file_aio_write, |
b6aeaded MS |
2150 | .mmap = fuse_file_mmap, |
2151 | .open = fuse_open, | |
2152 | .flush = fuse_flush, | |
2153 | .release = fuse_release, | |
2154 | .fsync = fuse_fsync, | |
71421259 | 2155 | .lock = fuse_file_lock, |
a9ff4f87 | 2156 | .flock = fuse_file_flock, |
5ffc4ef4 | 2157 | .splice_read = generic_file_splice_read, |
59efec7b TH |
2158 | .unlocked_ioctl = fuse_file_ioctl, |
2159 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 2160 | .poll = fuse_file_poll, |
b6aeaded MS |
2161 | }; |
2162 | ||
4b6f5d20 | 2163 | static const struct file_operations fuse_direct_io_file_operations = { |
5559b8f4 | 2164 | .llseek = fuse_file_llseek, |
413ef8cb MS |
2165 | .read = fuse_direct_read, |
2166 | .write = fuse_direct_write, | |
fc280c96 | 2167 | .mmap = fuse_direct_mmap, |
413ef8cb MS |
2168 | .open = fuse_open, |
2169 | .flush = fuse_flush, | |
2170 | .release = fuse_release, | |
2171 | .fsync = fuse_fsync, | |
71421259 | 2172 | .lock = fuse_file_lock, |
a9ff4f87 | 2173 | .flock = fuse_file_flock, |
59efec7b TH |
2174 | .unlocked_ioctl = fuse_file_ioctl, |
2175 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 2176 | .poll = fuse_file_poll, |
fc280c96 | 2177 | /* no splice_read */ |
413ef8cb MS |
2178 | }; |
2179 | ||
f5e54d6e | 2180 | static const struct address_space_operations fuse_file_aops = { |
b6aeaded | 2181 | .readpage = fuse_readpage, |
3be5a52b MS |
2182 | .writepage = fuse_writepage, |
2183 | .launder_page = fuse_launder_page, | |
5e6f58a1 NP |
2184 | .write_begin = fuse_write_begin, |
2185 | .write_end = fuse_write_end, | |
db50b96c | 2186 | .readpages = fuse_readpages, |
3be5a52b | 2187 | .set_page_dirty = __set_page_dirty_nobuffers, |
b2d2272f | 2188 | .bmap = fuse_bmap, |
b6aeaded MS |
2189 | }; |
2190 | ||
2191 | void fuse_init_file_inode(struct inode *inode) | |
2192 | { | |
45323fb7 MS |
2193 | inode->i_fop = &fuse_file_operations; |
2194 | inode->i_data.a_ops = &fuse_file_aops; | |
b6aeaded | 2195 | } |