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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> |
478e0841 | 17 | #include <linux/swap.h> |
b6aeaded | 18 | |
4b6f5d20 | 19 | static const struct file_operations fuse_direct_io_file_operations; |
45323fb7 | 20 | |
91fe96b4 MS |
21 | static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
22 | int opcode, struct fuse_open_out *outargp) | |
b6aeaded | 23 | { |
b6aeaded | 24 | struct fuse_open_in inarg; |
fd72faac MS |
25 | struct fuse_req *req; |
26 | int err; | |
27 | ||
ce1d5a49 MS |
28 | req = fuse_get_req(fc); |
29 | if (IS_ERR(req)) | |
30 | return PTR_ERR(req); | |
fd72faac MS |
31 | |
32 | memset(&inarg, 0, sizeof(inarg)); | |
6ff958ed MS |
33 | inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY); |
34 | if (!fc->atomic_o_trunc) | |
35 | inarg.flags &= ~O_TRUNC; | |
91fe96b4 MS |
36 | req->in.h.opcode = opcode; |
37 | req->in.h.nodeid = nodeid; | |
fd72faac MS |
38 | req->in.numargs = 1; |
39 | req->in.args[0].size = sizeof(inarg); | |
40 | req->in.args[0].value = &inarg; | |
41 | req->out.numargs = 1; | |
42 | req->out.args[0].size = sizeof(*outargp); | |
43 | req->out.args[0].value = outargp; | |
b93f858a | 44 | fuse_request_send(fc, req); |
fd72faac MS |
45 | err = req->out.h.error; |
46 | fuse_put_request(fc, req); | |
47 | ||
48 | return err; | |
49 | } | |
50 | ||
acf99433 | 51 | struct fuse_file *fuse_file_alloc(struct fuse_conn *fc) |
fd72faac MS |
52 | { |
53 | struct fuse_file *ff; | |
6b2db28a | 54 | |
fd72faac | 55 | ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL); |
6b2db28a TH |
56 | if (unlikely(!ff)) |
57 | return NULL; | |
58 | ||
da5e4714 | 59 | ff->fc = fc; |
6b2db28a TH |
60 | ff->reserved_req = fuse_request_alloc(); |
61 | if (unlikely(!ff->reserved_req)) { | |
62 | kfree(ff); | |
63 | return NULL; | |
fd72faac | 64 | } |
6b2db28a TH |
65 | |
66 | INIT_LIST_HEAD(&ff->write_entry); | |
67 | atomic_set(&ff->count, 0); | |
68 | RB_CLEAR_NODE(&ff->polled_node); | |
69 | init_waitqueue_head(&ff->poll_wait); | |
70 | ||
71 | spin_lock(&fc->lock); | |
72 | ff->kh = ++fc->khctr; | |
73 | spin_unlock(&fc->lock); | |
74 | ||
fd72faac MS |
75 | return ff; |
76 | } | |
77 | ||
78 | void fuse_file_free(struct fuse_file *ff) | |
79 | { | |
33649c91 | 80 | fuse_request_free(ff->reserved_req); |
fd72faac MS |
81 | kfree(ff); |
82 | } | |
83 | ||
c7b7143c | 84 | struct fuse_file *fuse_file_get(struct fuse_file *ff) |
c756e0a4 MS |
85 | { |
86 | atomic_inc(&ff->count); | |
87 | return ff; | |
88 | } | |
89 | ||
5a18ec17 MS |
90 | static void fuse_release_async(struct work_struct *work) |
91 | { | |
92 | struct fuse_req *req; | |
93 | struct fuse_conn *fc; | |
94 | struct path path; | |
95 | ||
96 | req = container_of(work, struct fuse_req, misc.release.work); | |
97 | path = req->misc.release.path; | |
98 | fc = get_fuse_conn(path.dentry->d_inode); | |
99 | ||
100 | fuse_put_request(fc, req); | |
101 | path_put(&path); | |
102 | } | |
103 | ||
819c4b3b MS |
104 | static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req) |
105 | { | |
5a18ec17 MS |
106 | if (fc->destroy_req) { |
107 | /* | |
108 | * If this is a fuseblk mount, then it's possible that | |
109 | * releasing the path will result in releasing the | |
110 | * super block and sending the DESTROY request. If | |
111 | * the server is single threaded, this would hang. | |
112 | * For this reason do the path_put() in a separate | |
113 | * thread. | |
114 | */ | |
115 | atomic_inc(&req->count); | |
116 | INIT_WORK(&req->misc.release.work, fuse_release_async); | |
117 | schedule_work(&req->misc.release.work); | |
118 | } else { | |
119 | path_put(&req->misc.release.path); | |
120 | } | |
819c4b3b MS |
121 | } |
122 | ||
5a18ec17 | 123 | static void fuse_file_put(struct fuse_file *ff, bool sync) |
c756e0a4 MS |
124 | { |
125 | if (atomic_dec_and_test(&ff->count)) { | |
126 | struct fuse_req *req = ff->reserved_req; | |
8b0797a4 | 127 | |
5a18ec17 MS |
128 | if (sync) { |
129 | fuse_request_send(ff->fc, req); | |
130 | path_put(&req->misc.release.path); | |
131 | fuse_put_request(ff->fc, req); | |
132 | } else { | |
133 | req->end = fuse_release_end; | |
134 | fuse_request_send_background(ff->fc, req); | |
135 | } | |
c756e0a4 MS |
136 | kfree(ff); |
137 | } | |
138 | } | |
139 | ||
08cbf542 TH |
140 | int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
141 | bool isdir) | |
91fe96b4 MS |
142 | { |
143 | struct fuse_open_out outarg; | |
144 | struct fuse_file *ff; | |
145 | int err; | |
146 | int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; | |
147 | ||
148 | ff = fuse_file_alloc(fc); | |
149 | if (!ff) | |
150 | return -ENOMEM; | |
151 | ||
152 | err = fuse_send_open(fc, nodeid, file, opcode, &outarg); | |
153 | if (err) { | |
154 | fuse_file_free(ff); | |
155 | return err; | |
156 | } | |
157 | ||
158 | if (isdir) | |
159 | outarg.open_flags &= ~FOPEN_DIRECT_IO; | |
160 | ||
161 | ff->fh = outarg.fh; | |
162 | ff->nodeid = nodeid; | |
163 | ff->open_flags = outarg.open_flags; | |
164 | file->private_data = fuse_file_get(ff); | |
165 | ||
166 | return 0; | |
167 | } | |
08cbf542 | 168 | EXPORT_SYMBOL_GPL(fuse_do_open); |
91fe96b4 | 169 | |
c7b7143c | 170 | void fuse_finish_open(struct inode *inode, struct file *file) |
fd72faac | 171 | { |
c7b7143c | 172 | struct fuse_file *ff = file->private_data; |
a0822c55 | 173 | struct fuse_conn *fc = get_fuse_conn(inode); |
c7b7143c MS |
174 | |
175 | if (ff->open_flags & FOPEN_DIRECT_IO) | |
fd72faac | 176 | file->f_op = &fuse_direct_io_file_operations; |
c7b7143c | 177 | if (!(ff->open_flags & FOPEN_KEEP_CACHE)) |
b1009979 | 178 | invalidate_inode_pages2(inode->i_mapping); |
c7b7143c | 179 | if (ff->open_flags & FOPEN_NONSEEKABLE) |
a7c1b990 | 180 | nonseekable_open(inode, file); |
a0822c55 KS |
181 | if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC)) { |
182 | struct fuse_inode *fi = get_fuse_inode(inode); | |
183 | ||
184 | spin_lock(&fc->lock); | |
185 | fi->attr_version = ++fc->attr_version; | |
186 | i_size_write(inode, 0); | |
187 | spin_unlock(&fc->lock); | |
188 | fuse_invalidate_attr(inode); | |
189 | } | |
fd72faac MS |
190 | } |
191 | ||
91fe96b4 | 192 | int fuse_open_common(struct inode *inode, struct file *file, bool isdir) |
fd72faac | 193 | { |
acf99433 | 194 | struct fuse_conn *fc = get_fuse_conn(inode); |
b6aeaded | 195 | int err; |
b6aeaded | 196 | |
dd190d06 MS |
197 | /* VFS checks this, but only _after_ ->open() */ |
198 | if (file->f_flags & O_DIRECT) | |
199 | return -EINVAL; | |
200 | ||
b6aeaded MS |
201 | err = generic_file_open(inode, file); |
202 | if (err) | |
203 | return err; | |
204 | ||
91fe96b4 | 205 | err = fuse_do_open(fc, get_node_id(inode), file, isdir); |
fd72faac | 206 | if (err) |
91fe96b4 | 207 | return err; |
b6aeaded | 208 | |
91fe96b4 MS |
209 | fuse_finish_open(inode, file); |
210 | ||
211 | return 0; | |
b6aeaded MS |
212 | } |
213 | ||
8b0797a4 | 214 | static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode) |
64c6d8ed | 215 | { |
8b0797a4 | 216 | struct fuse_conn *fc = ff->fc; |
33649c91 | 217 | struct fuse_req *req = ff->reserved_req; |
b57d4264 | 218 | struct fuse_release_in *inarg = &req->misc.release.in; |
b6aeaded | 219 | |
8b0797a4 MS |
220 | spin_lock(&fc->lock); |
221 | list_del(&ff->write_entry); | |
222 | if (!RB_EMPTY_NODE(&ff->polled_node)) | |
223 | rb_erase(&ff->polled_node, &fc->polled_files); | |
224 | spin_unlock(&fc->lock); | |
225 | ||
357ccf2b | 226 | wake_up_interruptible_all(&ff->poll_wait); |
8b0797a4 | 227 | |
b6aeaded | 228 | inarg->fh = ff->fh; |
fd72faac | 229 | inarg->flags = flags; |
51eb01e7 | 230 | req->in.h.opcode = opcode; |
c7b7143c | 231 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
232 | req->in.numargs = 1; |
233 | req->in.args[0].size = sizeof(struct fuse_release_in); | |
234 | req->in.args[0].value = inarg; | |
fd72faac MS |
235 | } |
236 | ||
8b0797a4 | 237 | void fuse_release_common(struct file *file, int opcode) |
fd72faac | 238 | { |
6b2db28a TH |
239 | struct fuse_file *ff; |
240 | struct fuse_req *req; | |
b6aeaded | 241 | |
6b2db28a TH |
242 | ff = file->private_data; |
243 | if (unlikely(!ff)) | |
8b0797a4 | 244 | return; |
6b2db28a | 245 | |
6b2db28a | 246 | req = ff->reserved_req; |
8b0797a4 | 247 | fuse_prepare_release(ff, file->f_flags, opcode); |
6b2db28a | 248 | |
37fb3a30 MS |
249 | if (ff->flock) { |
250 | struct fuse_release_in *inarg = &req->misc.release.in; | |
251 | inarg->release_flags |= FUSE_RELEASE_FLOCK_UNLOCK; | |
252 | inarg->lock_owner = fuse_lock_owner_id(ff->fc, | |
253 | (fl_owner_t) file); | |
254 | } | |
6b2db28a | 255 | /* Hold vfsmount and dentry until release is finished */ |
b0be46eb MS |
256 | path_get(&file->f_path); |
257 | req->misc.release.path = file->f_path; | |
6b2db28a | 258 | |
6b2db28a TH |
259 | /* |
260 | * Normally this will send the RELEASE request, however if | |
261 | * some asynchronous READ or WRITE requests are outstanding, | |
262 | * the sending will be delayed. | |
5a18ec17 MS |
263 | * |
264 | * Make the release synchronous if this is a fuseblk mount, | |
265 | * synchronous RELEASE is allowed (and desirable) in this case | |
266 | * because the server can be trusted not to screw up. | |
6b2db28a | 267 | */ |
5a18ec17 | 268 | fuse_file_put(ff, ff->fc->destroy_req != NULL); |
b6aeaded MS |
269 | } |
270 | ||
04730fef MS |
271 | static int fuse_open(struct inode *inode, struct file *file) |
272 | { | |
91fe96b4 | 273 | return fuse_open_common(inode, file, false); |
04730fef MS |
274 | } |
275 | ||
276 | static int fuse_release(struct inode *inode, struct file *file) | |
277 | { | |
8b0797a4 MS |
278 | fuse_release_common(file, FUSE_RELEASE); |
279 | ||
280 | /* return value is ignored by VFS */ | |
281 | return 0; | |
282 | } | |
283 | ||
284 | void fuse_sync_release(struct fuse_file *ff, int flags) | |
285 | { | |
286 | WARN_ON(atomic_read(&ff->count) > 1); | |
287 | fuse_prepare_release(ff, flags, FUSE_RELEASE); | |
288 | ff->reserved_req->force = 1; | |
289 | fuse_request_send(ff->fc, ff->reserved_req); | |
290 | fuse_put_request(ff->fc, ff->reserved_req); | |
291 | kfree(ff); | |
04730fef | 292 | } |
08cbf542 | 293 | EXPORT_SYMBOL_GPL(fuse_sync_release); |
04730fef | 294 | |
71421259 | 295 | /* |
9c8ef561 MS |
296 | * Scramble the ID space with XTEA, so that the value of the files_struct |
297 | * pointer is not exposed to userspace. | |
71421259 | 298 | */ |
f3332114 | 299 | u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id) |
71421259 | 300 | { |
9c8ef561 MS |
301 | u32 *k = fc->scramble_key; |
302 | u64 v = (unsigned long) id; | |
303 | u32 v0 = v; | |
304 | u32 v1 = v >> 32; | |
305 | u32 sum = 0; | |
306 | int i; | |
307 | ||
308 | for (i = 0; i < 32; i++) { | |
309 | v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]); | |
310 | sum += 0x9E3779B9; | |
311 | v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]); | |
312 | } | |
313 | ||
314 | return (u64) v0 + ((u64) v1 << 32); | |
71421259 MS |
315 | } |
316 | ||
3be5a52b MS |
317 | /* |
318 | * Check if page is under writeback | |
319 | * | |
320 | * This is currently done by walking the list of writepage requests | |
321 | * for the inode, which can be pretty inefficient. | |
322 | */ | |
323 | static bool fuse_page_is_writeback(struct inode *inode, pgoff_t index) | |
324 | { | |
325 | struct fuse_conn *fc = get_fuse_conn(inode); | |
326 | struct fuse_inode *fi = get_fuse_inode(inode); | |
327 | struct fuse_req *req; | |
328 | bool found = false; | |
329 | ||
330 | spin_lock(&fc->lock); | |
331 | list_for_each_entry(req, &fi->writepages, writepages_entry) { | |
332 | pgoff_t curr_index; | |
333 | ||
334 | BUG_ON(req->inode != inode); | |
335 | curr_index = req->misc.write.in.offset >> PAGE_CACHE_SHIFT; | |
336 | if (curr_index == index) { | |
337 | found = true; | |
338 | break; | |
339 | } | |
340 | } | |
341 | spin_unlock(&fc->lock); | |
342 | ||
343 | return found; | |
344 | } | |
345 | ||
346 | /* | |
347 | * Wait for page writeback to be completed. | |
348 | * | |
349 | * Since fuse doesn't rely on the VM writeback tracking, this has to | |
350 | * use some other means. | |
351 | */ | |
352 | static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index) | |
353 | { | |
354 | struct fuse_inode *fi = get_fuse_inode(inode); | |
355 | ||
356 | wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index)); | |
357 | return 0; | |
358 | } | |
359 | ||
75e1fcc0 | 360 | static int fuse_flush(struct file *file, fl_owner_t id) |
b6aeaded | 361 | { |
7706a9d6 | 362 | struct inode *inode = file->f_path.dentry->d_inode; |
b6aeaded MS |
363 | struct fuse_conn *fc = get_fuse_conn(inode); |
364 | struct fuse_file *ff = file->private_data; | |
365 | struct fuse_req *req; | |
366 | struct fuse_flush_in inarg; | |
367 | int err; | |
368 | ||
248d86e8 MS |
369 | if (is_bad_inode(inode)) |
370 | return -EIO; | |
371 | ||
b6aeaded MS |
372 | if (fc->no_flush) |
373 | return 0; | |
374 | ||
33649c91 | 375 | req = fuse_get_req_nofail(fc, file); |
b6aeaded MS |
376 | memset(&inarg, 0, sizeof(inarg)); |
377 | inarg.fh = ff->fh; | |
9c8ef561 | 378 | inarg.lock_owner = fuse_lock_owner_id(fc, id); |
b6aeaded MS |
379 | req->in.h.opcode = FUSE_FLUSH; |
380 | req->in.h.nodeid = get_node_id(inode); | |
b6aeaded MS |
381 | req->in.numargs = 1; |
382 | req->in.args[0].size = sizeof(inarg); | |
383 | req->in.args[0].value = &inarg; | |
71421259 | 384 | req->force = 1; |
b93f858a | 385 | fuse_request_send(fc, req); |
b6aeaded MS |
386 | err = req->out.h.error; |
387 | fuse_put_request(fc, req); | |
388 | if (err == -ENOSYS) { | |
389 | fc->no_flush = 1; | |
390 | err = 0; | |
391 | } | |
392 | return err; | |
393 | } | |
394 | ||
3be5a52b MS |
395 | /* |
396 | * Wait for all pending writepages on the inode to finish. | |
397 | * | |
398 | * This is currently done by blocking further writes with FUSE_NOWRITE | |
399 | * and waiting for all sent writes to complete. | |
400 | * | |
401 | * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage | |
402 | * could conflict with truncation. | |
403 | */ | |
404 | static void fuse_sync_writes(struct inode *inode) | |
405 | { | |
406 | fuse_set_nowrite(inode); | |
407 | fuse_release_nowrite(inode); | |
408 | } | |
409 | ||
02c24a82 JB |
410 | int fuse_fsync_common(struct file *file, loff_t start, loff_t end, |
411 | int datasync, int isdir) | |
b6aeaded | 412 | { |
7ea80859 | 413 | struct inode *inode = file->f_mapping->host; |
b6aeaded MS |
414 | struct fuse_conn *fc = get_fuse_conn(inode); |
415 | struct fuse_file *ff = file->private_data; | |
416 | struct fuse_req *req; | |
417 | struct fuse_fsync_in inarg; | |
418 | int err; | |
419 | ||
248d86e8 MS |
420 | if (is_bad_inode(inode)) |
421 | return -EIO; | |
422 | ||
02c24a82 JB |
423 | err = filemap_write_and_wait_range(inode->i_mapping, start, end); |
424 | if (err) | |
425 | return err; | |
426 | ||
82547981 | 427 | if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir)) |
b6aeaded MS |
428 | return 0; |
429 | ||
02c24a82 JB |
430 | mutex_lock(&inode->i_mutex); |
431 | ||
3be5a52b MS |
432 | /* |
433 | * Start writeback against all dirty pages of the inode, then | |
434 | * wait for all outstanding writes, before sending the FSYNC | |
435 | * request. | |
436 | */ | |
437 | err = write_inode_now(inode, 0); | |
438 | if (err) | |
02c24a82 | 439 | goto out; |
3be5a52b MS |
440 | |
441 | fuse_sync_writes(inode); | |
442 | ||
ce1d5a49 | 443 | req = fuse_get_req(fc); |
02c24a82 JB |
444 | if (IS_ERR(req)) { |
445 | err = PTR_ERR(req); | |
446 | goto out; | |
447 | } | |
b6aeaded MS |
448 | |
449 | memset(&inarg, 0, sizeof(inarg)); | |
450 | inarg.fh = ff->fh; | |
451 | inarg.fsync_flags = datasync ? 1 : 0; | |
82547981 | 452 | req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC; |
b6aeaded | 453 | req->in.h.nodeid = get_node_id(inode); |
b6aeaded MS |
454 | req->in.numargs = 1; |
455 | req->in.args[0].size = sizeof(inarg); | |
456 | req->in.args[0].value = &inarg; | |
b93f858a | 457 | fuse_request_send(fc, req); |
b6aeaded MS |
458 | err = req->out.h.error; |
459 | fuse_put_request(fc, req); | |
460 | if (err == -ENOSYS) { | |
82547981 MS |
461 | if (isdir) |
462 | fc->no_fsyncdir = 1; | |
463 | else | |
464 | fc->no_fsync = 1; | |
b6aeaded MS |
465 | err = 0; |
466 | } | |
02c24a82 JB |
467 | out: |
468 | mutex_unlock(&inode->i_mutex); | |
b6aeaded MS |
469 | return err; |
470 | } | |
471 | ||
02c24a82 JB |
472 | static int fuse_fsync(struct file *file, loff_t start, loff_t end, |
473 | int datasync) | |
82547981 | 474 | { |
02c24a82 | 475 | return fuse_fsync_common(file, start, end, datasync, 0); |
82547981 MS |
476 | } |
477 | ||
2106cb18 MS |
478 | void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos, |
479 | size_t count, int opcode) | |
b6aeaded | 480 | { |
5c5c5e51 | 481 | struct fuse_read_in *inarg = &req->misc.read.in; |
a6643094 | 482 | struct fuse_file *ff = file->private_data; |
b6aeaded | 483 | |
361b1eb5 MS |
484 | inarg->fh = ff->fh; |
485 | inarg->offset = pos; | |
486 | inarg->size = count; | |
a6643094 | 487 | inarg->flags = file->f_flags; |
361b1eb5 | 488 | req->in.h.opcode = opcode; |
2106cb18 | 489 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
490 | req->in.numargs = 1; |
491 | req->in.args[0].size = sizeof(struct fuse_read_in); | |
c1aa96a5 | 492 | req->in.args[0].value = inarg; |
b6aeaded MS |
493 | req->out.argvar = 1; |
494 | req->out.numargs = 1; | |
495 | req->out.args[0].size = count; | |
b6aeaded MS |
496 | } |
497 | ||
8bfc016d | 498 | static size_t fuse_send_read(struct fuse_req *req, struct file *file, |
2106cb18 | 499 | loff_t pos, size_t count, fl_owner_t owner) |
04730fef | 500 | { |
2106cb18 MS |
501 | struct fuse_file *ff = file->private_data; |
502 | struct fuse_conn *fc = ff->fc; | |
f3332114 | 503 | |
2106cb18 | 504 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
f3332114 | 505 | if (owner != NULL) { |
5c5c5e51 | 506 | struct fuse_read_in *inarg = &req->misc.read.in; |
f3332114 MS |
507 | |
508 | inarg->read_flags |= FUSE_READ_LOCKOWNER; | |
509 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
510 | } | |
b93f858a | 511 | fuse_request_send(fc, req); |
361b1eb5 | 512 | return req->out.args[0].size; |
04730fef MS |
513 | } |
514 | ||
5c5c5e51 MS |
515 | static void fuse_read_update_size(struct inode *inode, loff_t size, |
516 | u64 attr_ver) | |
517 | { | |
518 | struct fuse_conn *fc = get_fuse_conn(inode); | |
519 | struct fuse_inode *fi = get_fuse_inode(inode); | |
520 | ||
521 | spin_lock(&fc->lock); | |
522 | if (attr_ver == fi->attr_version && size < inode->i_size) { | |
523 | fi->attr_version = ++fc->attr_version; | |
524 | i_size_write(inode, size); | |
525 | } | |
526 | spin_unlock(&fc->lock); | |
527 | } | |
528 | ||
b6aeaded MS |
529 | static int fuse_readpage(struct file *file, struct page *page) |
530 | { | |
531 | struct inode *inode = page->mapping->host; | |
532 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 | 533 | struct fuse_req *req; |
5c5c5e51 MS |
534 | size_t num_read; |
535 | loff_t pos = page_offset(page); | |
536 | size_t count = PAGE_CACHE_SIZE; | |
537 | u64 attr_ver; | |
248d86e8 MS |
538 | int err; |
539 | ||
540 | err = -EIO; | |
541 | if (is_bad_inode(inode)) | |
542 | goto out; | |
543 | ||
3be5a52b | 544 | /* |
25985edc | 545 | * Page writeback can extend beyond the lifetime of the |
3be5a52b MS |
546 | * page-cache page, so make sure we read a properly synced |
547 | * page. | |
548 | */ | |
549 | fuse_wait_on_page_writeback(inode, page->index); | |
550 | ||
ce1d5a49 MS |
551 | req = fuse_get_req(fc); |
552 | err = PTR_ERR(req); | |
553 | if (IS_ERR(req)) | |
b6aeaded MS |
554 | goto out; |
555 | ||
5c5c5e51 MS |
556 | attr_ver = fuse_get_attr_version(fc); |
557 | ||
b6aeaded | 558 | req->out.page_zeroing = 1; |
f4975c67 | 559 | req->out.argpages = 1; |
b6aeaded MS |
560 | req->num_pages = 1; |
561 | req->pages[0] = page; | |
2106cb18 | 562 | num_read = fuse_send_read(req, file, pos, count, NULL); |
b6aeaded MS |
563 | err = req->out.h.error; |
564 | fuse_put_request(fc, req); | |
5c5c5e51 MS |
565 | |
566 | if (!err) { | |
567 | /* | |
568 | * Short read means EOF. If file size is larger, truncate it | |
569 | */ | |
570 | if (num_read < count) | |
571 | fuse_read_update_size(inode, pos + num_read, attr_ver); | |
572 | ||
b6aeaded | 573 | SetPageUptodate(page); |
5c5c5e51 MS |
574 | } |
575 | ||
b36c31ba | 576 | fuse_invalidate_attr(inode); /* atime changed */ |
b6aeaded MS |
577 | out: |
578 | unlock_page(page); | |
579 | return err; | |
580 | } | |
581 | ||
c1aa96a5 | 582 | static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req) |
db50b96c | 583 | { |
c1aa96a5 | 584 | int i; |
5c5c5e51 MS |
585 | size_t count = req->misc.read.in.size; |
586 | size_t num_read = req->out.args[0].size; | |
ce534fb0 | 587 | struct address_space *mapping = NULL; |
c1aa96a5 | 588 | |
ce534fb0 MS |
589 | for (i = 0; mapping == NULL && i < req->num_pages; i++) |
590 | mapping = req->pages[i]->mapping; | |
5c5c5e51 | 591 | |
ce534fb0 MS |
592 | if (mapping) { |
593 | struct inode *inode = mapping->host; | |
594 | ||
595 | /* | |
596 | * Short read means EOF. If file size is larger, truncate it | |
597 | */ | |
598 | if (!req->out.h.error && num_read < count) { | |
599 | loff_t pos; | |
600 | ||
601 | pos = page_offset(req->pages[0]) + num_read; | |
602 | fuse_read_update_size(inode, pos, | |
603 | req->misc.read.attr_ver); | |
604 | } | |
605 | fuse_invalidate_attr(inode); /* atime changed */ | |
606 | } | |
c1aa96a5 | 607 | |
db50b96c MS |
608 | for (i = 0; i < req->num_pages; i++) { |
609 | struct page *page = req->pages[i]; | |
610 | if (!req->out.h.error) | |
611 | SetPageUptodate(page); | |
c1aa96a5 MS |
612 | else |
613 | SetPageError(page); | |
db50b96c | 614 | unlock_page(page); |
b5dd3285 | 615 | page_cache_release(page); |
db50b96c | 616 | } |
c756e0a4 | 617 | if (req->ff) |
5a18ec17 | 618 | fuse_file_put(req->ff, false); |
c1aa96a5 MS |
619 | } |
620 | ||
2106cb18 | 621 | static void fuse_send_readpages(struct fuse_req *req, struct file *file) |
c1aa96a5 | 622 | { |
2106cb18 MS |
623 | struct fuse_file *ff = file->private_data; |
624 | struct fuse_conn *fc = ff->fc; | |
c1aa96a5 MS |
625 | loff_t pos = page_offset(req->pages[0]); |
626 | size_t count = req->num_pages << PAGE_CACHE_SHIFT; | |
f4975c67 MS |
627 | |
628 | req->out.argpages = 1; | |
c1aa96a5 | 629 | req->out.page_zeroing = 1; |
ce534fb0 | 630 | req->out.page_replace = 1; |
2106cb18 | 631 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
5c5c5e51 | 632 | req->misc.read.attr_ver = fuse_get_attr_version(fc); |
9cd68455 | 633 | if (fc->async_read) { |
c756e0a4 | 634 | req->ff = fuse_file_get(ff); |
9cd68455 | 635 | req->end = fuse_readpages_end; |
b93f858a | 636 | fuse_request_send_background(fc, req); |
9cd68455 | 637 | } else { |
b93f858a | 638 | fuse_request_send(fc, req); |
9cd68455 | 639 | fuse_readpages_end(fc, req); |
e9bb09dd | 640 | fuse_put_request(fc, req); |
9cd68455 | 641 | } |
db50b96c MS |
642 | } |
643 | ||
c756e0a4 | 644 | struct fuse_fill_data { |
db50b96c | 645 | struct fuse_req *req; |
a6643094 | 646 | struct file *file; |
db50b96c MS |
647 | struct inode *inode; |
648 | }; | |
649 | ||
650 | static int fuse_readpages_fill(void *_data, struct page *page) | |
651 | { | |
c756e0a4 | 652 | struct fuse_fill_data *data = _data; |
db50b96c MS |
653 | struct fuse_req *req = data->req; |
654 | struct inode *inode = data->inode; | |
655 | struct fuse_conn *fc = get_fuse_conn(inode); | |
656 | ||
3be5a52b MS |
657 | fuse_wait_on_page_writeback(inode, page->index); |
658 | ||
db50b96c MS |
659 | if (req->num_pages && |
660 | (req->num_pages == FUSE_MAX_PAGES_PER_REQ || | |
661 | (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read || | |
662 | req->pages[req->num_pages - 1]->index + 1 != page->index)) { | |
2106cb18 | 663 | fuse_send_readpages(req, data->file); |
ce1d5a49 MS |
664 | data->req = req = fuse_get_req(fc); |
665 | if (IS_ERR(req)) { | |
db50b96c | 666 | unlock_page(page); |
ce1d5a49 | 667 | return PTR_ERR(req); |
db50b96c | 668 | } |
db50b96c | 669 | } |
b5dd3285 | 670 | page_cache_get(page); |
db50b96c | 671 | req->pages[req->num_pages] = page; |
1729a16c | 672 | req->num_pages++; |
db50b96c MS |
673 | return 0; |
674 | } | |
675 | ||
676 | static int fuse_readpages(struct file *file, struct address_space *mapping, | |
677 | struct list_head *pages, unsigned nr_pages) | |
678 | { | |
679 | struct inode *inode = mapping->host; | |
680 | struct fuse_conn *fc = get_fuse_conn(inode); | |
c756e0a4 | 681 | struct fuse_fill_data data; |
db50b96c | 682 | int err; |
248d86e8 | 683 | |
1d7ea732 | 684 | err = -EIO; |
248d86e8 | 685 | if (is_bad_inode(inode)) |
2e990021 | 686 | goto out; |
248d86e8 | 687 | |
a6643094 | 688 | data.file = file; |
db50b96c | 689 | data.inode = inode; |
ce1d5a49 | 690 | data.req = fuse_get_req(fc); |
1d7ea732 | 691 | err = PTR_ERR(data.req); |
ce1d5a49 | 692 | if (IS_ERR(data.req)) |
2e990021 | 693 | goto out; |
db50b96c MS |
694 | |
695 | err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); | |
d3406ffa MS |
696 | if (!err) { |
697 | if (data.req->num_pages) | |
2106cb18 | 698 | fuse_send_readpages(data.req, file); |
d3406ffa MS |
699 | else |
700 | fuse_put_request(fc, data.req); | |
701 | } | |
2e990021 | 702 | out: |
1d7ea732 | 703 | return err; |
db50b96c MS |
704 | } |
705 | ||
bcb4be80 MS |
706 | static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov, |
707 | unsigned long nr_segs, loff_t pos) | |
708 | { | |
709 | struct inode *inode = iocb->ki_filp->f_mapping->host; | |
710 | ||
711 | if (pos + iov_length(iov, nr_segs) > i_size_read(inode)) { | |
712 | int err; | |
713 | /* | |
714 | * If trying to read past EOF, make sure the i_size | |
715 | * attribute is up-to-date. | |
716 | */ | |
717 | err = fuse_update_attributes(inode, NULL, iocb->ki_filp, NULL); | |
718 | if (err) | |
719 | return err; | |
720 | } | |
721 | ||
722 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
723 | } | |
724 | ||
2d698b07 | 725 | static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff, |
2106cb18 | 726 | loff_t pos, size_t count) |
b6aeaded | 727 | { |
b25e82e5 MS |
728 | struct fuse_write_in *inarg = &req->misc.write.in; |
729 | struct fuse_write_out *outarg = &req->misc.write.out; | |
b6aeaded | 730 | |
b25e82e5 MS |
731 | inarg->fh = ff->fh; |
732 | inarg->offset = pos; | |
733 | inarg->size = count; | |
b6aeaded | 734 | req->in.h.opcode = FUSE_WRITE; |
2106cb18 | 735 | req->in.h.nodeid = ff->nodeid; |
b6aeaded | 736 | req->in.numargs = 2; |
2106cb18 | 737 | if (ff->fc->minor < 9) |
f3332114 MS |
738 | req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE; |
739 | else | |
740 | req->in.args[0].size = sizeof(struct fuse_write_in); | |
b25e82e5 | 741 | req->in.args[0].value = inarg; |
b6aeaded MS |
742 | req->in.args[1].size = count; |
743 | req->out.numargs = 1; | |
744 | req->out.args[0].size = sizeof(struct fuse_write_out); | |
b25e82e5 MS |
745 | req->out.args[0].value = outarg; |
746 | } | |
747 | ||
748 | static size_t fuse_send_write(struct fuse_req *req, struct file *file, | |
2106cb18 | 749 | loff_t pos, size_t count, fl_owner_t owner) |
b25e82e5 | 750 | { |
2106cb18 MS |
751 | struct fuse_file *ff = file->private_data; |
752 | struct fuse_conn *fc = ff->fc; | |
2d698b07 MS |
753 | struct fuse_write_in *inarg = &req->misc.write.in; |
754 | ||
2106cb18 | 755 | fuse_write_fill(req, ff, pos, count); |
2d698b07 | 756 | inarg->flags = file->f_flags; |
f3332114 | 757 | if (owner != NULL) { |
f3332114 MS |
758 | inarg->write_flags |= FUSE_WRITE_LOCKOWNER; |
759 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
760 | } | |
b93f858a | 761 | fuse_request_send(fc, req); |
b25e82e5 | 762 | return req->misc.write.out.size; |
b6aeaded MS |
763 | } |
764 | ||
a1d75f25 | 765 | void fuse_write_update_size(struct inode *inode, loff_t pos) |
854512ec MS |
766 | { |
767 | struct fuse_conn *fc = get_fuse_conn(inode); | |
768 | struct fuse_inode *fi = get_fuse_inode(inode); | |
769 | ||
770 | spin_lock(&fc->lock); | |
771 | fi->attr_version = ++fc->attr_version; | |
772 | if (pos > inode->i_size) | |
773 | i_size_write(inode, pos); | |
774 | spin_unlock(&fc->lock); | |
775 | } | |
776 | ||
ea9b9907 NP |
777 | static size_t fuse_send_write_pages(struct fuse_req *req, struct file *file, |
778 | struct inode *inode, loff_t pos, | |
779 | size_t count) | |
780 | { | |
781 | size_t res; | |
782 | unsigned offset; | |
783 | unsigned i; | |
784 | ||
785 | for (i = 0; i < req->num_pages; i++) | |
786 | fuse_wait_on_page_writeback(inode, req->pages[i]->index); | |
787 | ||
2106cb18 | 788 | res = fuse_send_write(req, file, pos, count, NULL); |
ea9b9907 NP |
789 | |
790 | offset = req->page_offset; | |
791 | count = res; | |
792 | for (i = 0; i < req->num_pages; i++) { | |
793 | struct page *page = req->pages[i]; | |
794 | ||
795 | if (!req->out.h.error && !offset && count >= PAGE_CACHE_SIZE) | |
796 | SetPageUptodate(page); | |
797 | ||
798 | if (count > PAGE_CACHE_SIZE - offset) | |
799 | count -= PAGE_CACHE_SIZE - offset; | |
800 | else | |
801 | count = 0; | |
802 | offset = 0; | |
803 | ||
804 | unlock_page(page); | |
805 | page_cache_release(page); | |
806 | } | |
807 | ||
808 | return res; | |
809 | } | |
810 | ||
811 | static ssize_t fuse_fill_write_pages(struct fuse_req *req, | |
812 | struct address_space *mapping, | |
813 | struct iov_iter *ii, loff_t pos) | |
814 | { | |
815 | struct fuse_conn *fc = get_fuse_conn(mapping->host); | |
816 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
817 | size_t count = 0; | |
818 | int err; | |
819 | ||
f4975c67 | 820 | req->in.argpages = 1; |
ea9b9907 NP |
821 | req->page_offset = offset; |
822 | ||
823 | do { | |
824 | size_t tmp; | |
825 | struct page *page; | |
826 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; | |
827 | size_t bytes = min_t(size_t, PAGE_CACHE_SIZE - offset, | |
828 | iov_iter_count(ii)); | |
829 | ||
830 | bytes = min_t(size_t, bytes, fc->max_write - count); | |
831 | ||
832 | again: | |
833 | err = -EFAULT; | |
834 | if (iov_iter_fault_in_readable(ii, bytes)) | |
835 | break; | |
836 | ||
837 | err = -ENOMEM; | |
54566b2c | 838 | page = grab_cache_page_write_begin(mapping, index, 0); |
ea9b9907 NP |
839 | if (!page) |
840 | break; | |
841 | ||
931e80e4 | 842 | if (mapping_writably_mapped(mapping)) |
843 | flush_dcache_page(page); | |
844 | ||
ea9b9907 NP |
845 | pagefault_disable(); |
846 | tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes); | |
847 | pagefault_enable(); | |
848 | flush_dcache_page(page); | |
849 | ||
478e0841 JW |
850 | mark_page_accessed(page); |
851 | ||
ea9b9907 NP |
852 | if (!tmp) { |
853 | unlock_page(page); | |
854 | page_cache_release(page); | |
855 | bytes = min(bytes, iov_iter_single_seg_count(ii)); | |
856 | goto again; | |
857 | } | |
858 | ||
859 | err = 0; | |
860 | req->pages[req->num_pages] = page; | |
861 | req->num_pages++; | |
862 | ||
863 | iov_iter_advance(ii, tmp); | |
864 | count += tmp; | |
865 | pos += tmp; | |
866 | offset += tmp; | |
867 | if (offset == PAGE_CACHE_SIZE) | |
868 | offset = 0; | |
869 | ||
78bb6cb9 MS |
870 | if (!fc->big_writes) |
871 | break; | |
ea9b9907 NP |
872 | } while (iov_iter_count(ii) && count < fc->max_write && |
873 | req->num_pages < FUSE_MAX_PAGES_PER_REQ && offset == 0); | |
874 | ||
875 | return count > 0 ? count : err; | |
876 | } | |
877 | ||
878 | static ssize_t fuse_perform_write(struct file *file, | |
879 | struct address_space *mapping, | |
880 | struct iov_iter *ii, loff_t pos) | |
881 | { | |
882 | struct inode *inode = mapping->host; | |
883 | struct fuse_conn *fc = get_fuse_conn(inode); | |
884 | int err = 0; | |
885 | ssize_t res = 0; | |
886 | ||
887 | if (is_bad_inode(inode)) | |
888 | return -EIO; | |
889 | ||
890 | do { | |
891 | struct fuse_req *req; | |
892 | ssize_t count; | |
893 | ||
894 | req = fuse_get_req(fc); | |
895 | if (IS_ERR(req)) { | |
896 | err = PTR_ERR(req); | |
897 | break; | |
898 | } | |
899 | ||
900 | count = fuse_fill_write_pages(req, mapping, ii, pos); | |
901 | if (count <= 0) { | |
902 | err = count; | |
903 | } else { | |
904 | size_t num_written; | |
905 | ||
906 | num_written = fuse_send_write_pages(req, file, inode, | |
907 | pos, count); | |
908 | err = req->out.h.error; | |
909 | if (!err) { | |
910 | res += num_written; | |
911 | pos += num_written; | |
912 | ||
913 | /* break out of the loop on short write */ | |
914 | if (num_written != count) | |
915 | err = -EIO; | |
916 | } | |
917 | } | |
918 | fuse_put_request(fc, req); | |
919 | } while (!err && iov_iter_count(ii)); | |
920 | ||
921 | if (res > 0) | |
922 | fuse_write_update_size(inode, pos); | |
923 | ||
924 | fuse_invalidate_attr(inode); | |
925 | ||
926 | return res > 0 ? res : err; | |
927 | } | |
928 | ||
929 | static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
930 | unsigned long nr_segs, loff_t pos) | |
931 | { | |
932 | struct file *file = iocb->ki_filp; | |
933 | struct address_space *mapping = file->f_mapping; | |
934 | size_t count = 0; | |
935 | ssize_t written = 0; | |
936 | struct inode *inode = mapping->host; | |
937 | ssize_t err; | |
938 | struct iov_iter i; | |
939 | ||
940 | WARN_ON(iocb->ki_pos != pos); | |
941 | ||
942 | err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ); | |
943 | if (err) | |
944 | return err; | |
945 | ||
946 | mutex_lock(&inode->i_mutex); | |
947 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); | |
948 | ||
949 | /* We can write back this queue in page reclaim */ | |
950 | current->backing_dev_info = mapping->backing_dev_info; | |
951 | ||
952 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
953 | if (err) | |
954 | goto out; | |
955 | ||
956 | if (count == 0) | |
957 | goto out; | |
958 | ||
2f1936b8 | 959 | err = file_remove_suid(file); |
ea9b9907 NP |
960 | if (err) |
961 | goto out; | |
962 | ||
963 | file_update_time(file); | |
964 | ||
965 | iov_iter_init(&i, iov, nr_segs, count, 0); | |
966 | written = fuse_perform_write(file, mapping, &i, pos); | |
967 | if (written >= 0) | |
968 | iocb->ki_pos = pos + written; | |
969 | ||
970 | out: | |
971 | current->backing_dev_info = NULL; | |
972 | mutex_unlock(&inode->i_mutex); | |
973 | ||
974 | return written ? written : err; | |
975 | } | |
976 | ||
413ef8cb MS |
977 | static void fuse_release_user_pages(struct fuse_req *req, int write) |
978 | { | |
979 | unsigned i; | |
980 | ||
981 | for (i = 0; i < req->num_pages; i++) { | |
982 | struct page *page = req->pages[i]; | |
983 | if (write) | |
984 | set_page_dirty_lock(page); | |
985 | put_page(page); | |
986 | } | |
987 | } | |
988 | ||
989 | static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf, | |
ce60a2f1 | 990 | size_t *nbytesp, int write) |
413ef8cb | 991 | { |
ce60a2f1 | 992 | size_t nbytes = *nbytesp; |
413ef8cb MS |
993 | unsigned long user_addr = (unsigned long) buf; |
994 | unsigned offset = user_addr & ~PAGE_MASK; | |
995 | int npages; | |
996 | ||
f4975c67 MS |
997 | /* Special case for kernel I/O: can copy directly into the buffer */ |
998 | if (segment_eq(get_fs(), KERNEL_DS)) { | |
999 | if (write) | |
1000 | req->in.args[1].value = (void *) user_addr; | |
1001 | else | |
1002 | req->out.args[0].value = (void *) user_addr; | |
1003 | ||
1004 | return 0; | |
1005 | } | |
413ef8cb | 1006 | |
ce60a2f1 | 1007 | nbytes = min_t(size_t, nbytes, FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT); |
413ef8cb | 1008 | npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; |
bd730967 | 1009 | npages = clamp(npages, 1, FUSE_MAX_PAGES_PER_REQ); |
1bf94ca7 | 1010 | npages = get_user_pages_fast(user_addr, npages, !write, req->pages); |
413ef8cb MS |
1011 | if (npages < 0) |
1012 | return npages; | |
1013 | ||
1014 | req->num_pages = npages; | |
1015 | req->page_offset = offset; | |
f4975c67 MS |
1016 | |
1017 | if (write) | |
1018 | req->in.argpages = 1; | |
1019 | else | |
1020 | req->out.argpages = 1; | |
1021 | ||
1022 | nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset; | |
1023 | *nbytesp = min(*nbytesp, nbytes); | |
1024 | ||
413ef8cb MS |
1025 | return 0; |
1026 | } | |
1027 | ||
08cbf542 TH |
1028 | ssize_t fuse_direct_io(struct file *file, const char __user *buf, |
1029 | size_t count, loff_t *ppos, int write) | |
413ef8cb | 1030 | { |
2106cb18 MS |
1031 | struct fuse_file *ff = file->private_data; |
1032 | struct fuse_conn *fc = ff->fc; | |
413ef8cb MS |
1033 | size_t nmax = write ? fc->max_write : fc->max_read; |
1034 | loff_t pos = *ppos; | |
1035 | ssize_t res = 0; | |
248d86e8 MS |
1036 | struct fuse_req *req; |
1037 | ||
ce1d5a49 MS |
1038 | req = fuse_get_req(fc); |
1039 | if (IS_ERR(req)) | |
1040 | return PTR_ERR(req); | |
413ef8cb MS |
1041 | |
1042 | while (count) { | |
413ef8cb | 1043 | size_t nres; |
2106cb18 | 1044 | fl_owner_t owner = current->files; |
f4975c67 MS |
1045 | size_t nbytes = min(count, nmax); |
1046 | int err = fuse_get_user_pages(req, buf, &nbytes, write); | |
413ef8cb MS |
1047 | if (err) { |
1048 | res = err; | |
1049 | break; | |
1050 | } | |
f4975c67 | 1051 | |
413ef8cb | 1052 | if (write) |
2106cb18 | 1053 | nres = fuse_send_write(req, file, pos, nbytes, owner); |
413ef8cb | 1054 | else |
2106cb18 MS |
1055 | nres = fuse_send_read(req, file, pos, nbytes, owner); |
1056 | ||
413ef8cb MS |
1057 | fuse_release_user_pages(req, !write); |
1058 | if (req->out.h.error) { | |
1059 | if (!res) | |
1060 | res = req->out.h.error; | |
1061 | break; | |
1062 | } else if (nres > nbytes) { | |
1063 | res = -EIO; | |
1064 | break; | |
1065 | } | |
1066 | count -= nres; | |
1067 | res += nres; | |
1068 | pos += nres; | |
1069 | buf += nres; | |
1070 | if (nres != nbytes) | |
1071 | break; | |
56cf34ff MS |
1072 | if (count) { |
1073 | fuse_put_request(fc, req); | |
1074 | req = fuse_get_req(fc); | |
1075 | if (IS_ERR(req)) | |
1076 | break; | |
1077 | } | |
413ef8cb | 1078 | } |
f60311d5 AA |
1079 | if (!IS_ERR(req)) |
1080 | fuse_put_request(fc, req); | |
d09cb9d7 | 1081 | if (res > 0) |
413ef8cb | 1082 | *ppos = pos; |
413ef8cb MS |
1083 | |
1084 | return res; | |
1085 | } | |
08cbf542 | 1086 | EXPORT_SYMBOL_GPL(fuse_direct_io); |
413ef8cb MS |
1087 | |
1088 | static ssize_t fuse_direct_read(struct file *file, char __user *buf, | |
1089 | size_t count, loff_t *ppos) | |
1090 | { | |
d09cb9d7 MS |
1091 | ssize_t res; |
1092 | struct inode *inode = file->f_path.dentry->d_inode; | |
1093 | ||
1094 | if (is_bad_inode(inode)) | |
1095 | return -EIO; | |
1096 | ||
1097 | res = fuse_direct_io(file, buf, count, ppos, 0); | |
1098 | ||
1099 | fuse_invalidate_attr(inode); | |
1100 | ||
1101 | return res; | |
413ef8cb MS |
1102 | } |
1103 | ||
1104 | static ssize_t fuse_direct_write(struct file *file, const char __user *buf, | |
1105 | size_t count, loff_t *ppos) | |
1106 | { | |
7706a9d6 | 1107 | struct inode *inode = file->f_path.dentry->d_inode; |
413ef8cb | 1108 | ssize_t res; |
d09cb9d7 MS |
1109 | |
1110 | if (is_bad_inode(inode)) | |
1111 | return -EIO; | |
1112 | ||
413ef8cb | 1113 | /* Don't allow parallel writes to the same file */ |
1b1dcc1b | 1114 | mutex_lock(&inode->i_mutex); |
889f7848 | 1115 | res = generic_write_checks(file, ppos, &count, 0); |
d09cb9d7 | 1116 | if (!res) { |
889f7848 | 1117 | res = fuse_direct_io(file, buf, count, ppos, 1); |
d09cb9d7 MS |
1118 | if (res > 0) |
1119 | fuse_write_update_size(inode, *ppos); | |
1120 | } | |
1b1dcc1b | 1121 | mutex_unlock(&inode->i_mutex); |
d09cb9d7 MS |
1122 | |
1123 | fuse_invalidate_attr(inode); | |
1124 | ||
413ef8cb MS |
1125 | return res; |
1126 | } | |
1127 | ||
3be5a52b | 1128 | static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req) |
b6aeaded | 1129 | { |
3be5a52b | 1130 | __free_page(req->pages[0]); |
5a18ec17 | 1131 | fuse_file_put(req->ff, false); |
3be5a52b MS |
1132 | } |
1133 | ||
1134 | static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req) | |
1135 | { | |
1136 | struct inode *inode = req->inode; | |
1137 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1138 | struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info; | |
1139 | ||
1140 | list_del(&req->writepages_entry); | |
1141 | dec_bdi_stat(bdi, BDI_WRITEBACK); | |
1142 | dec_zone_page_state(req->pages[0], NR_WRITEBACK_TEMP); | |
1143 | bdi_writeout_inc(bdi); | |
1144 | wake_up(&fi->page_waitq); | |
1145 | } | |
1146 | ||
1147 | /* Called under fc->lock, may release and reacquire it */ | |
1148 | static void fuse_send_writepage(struct fuse_conn *fc, struct fuse_req *req) | |
b9ca67b2 MS |
1149 | __releases(fc->lock) |
1150 | __acquires(fc->lock) | |
3be5a52b MS |
1151 | { |
1152 | struct fuse_inode *fi = get_fuse_inode(req->inode); | |
1153 | loff_t size = i_size_read(req->inode); | |
1154 | struct fuse_write_in *inarg = &req->misc.write.in; | |
1155 | ||
1156 | if (!fc->connected) | |
1157 | goto out_free; | |
1158 | ||
1159 | if (inarg->offset + PAGE_CACHE_SIZE <= size) { | |
1160 | inarg->size = PAGE_CACHE_SIZE; | |
1161 | } else if (inarg->offset < size) { | |
1162 | inarg->size = size & (PAGE_CACHE_SIZE - 1); | |
1163 | } else { | |
1164 | /* Got truncated off completely */ | |
1165 | goto out_free; | |
b6aeaded | 1166 | } |
3be5a52b MS |
1167 | |
1168 | req->in.args[1].size = inarg->size; | |
1169 | fi->writectr++; | |
b93f858a | 1170 | fuse_request_send_background_locked(fc, req); |
3be5a52b MS |
1171 | return; |
1172 | ||
1173 | out_free: | |
1174 | fuse_writepage_finish(fc, req); | |
1175 | spin_unlock(&fc->lock); | |
1176 | fuse_writepage_free(fc, req); | |
e9bb09dd | 1177 | fuse_put_request(fc, req); |
3be5a52b | 1178 | spin_lock(&fc->lock); |
b6aeaded MS |
1179 | } |
1180 | ||
3be5a52b MS |
1181 | /* |
1182 | * If fi->writectr is positive (no truncate or fsync going on) send | |
1183 | * all queued writepage requests. | |
1184 | * | |
1185 | * Called with fc->lock | |
1186 | */ | |
1187 | void fuse_flush_writepages(struct inode *inode) | |
b9ca67b2 MS |
1188 | __releases(fc->lock) |
1189 | __acquires(fc->lock) | |
b6aeaded | 1190 | { |
3be5a52b MS |
1191 | struct fuse_conn *fc = get_fuse_conn(inode); |
1192 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1193 | struct fuse_req *req; | |
1194 | ||
1195 | while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) { | |
1196 | req = list_entry(fi->queued_writes.next, struct fuse_req, list); | |
1197 | list_del_init(&req->list); | |
1198 | fuse_send_writepage(fc, req); | |
1199 | } | |
1200 | } | |
1201 | ||
1202 | static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req) | |
1203 | { | |
1204 | struct inode *inode = req->inode; | |
1205 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1206 | ||
1207 | mapping_set_error(inode->i_mapping, req->out.h.error); | |
1208 | spin_lock(&fc->lock); | |
1209 | fi->writectr--; | |
1210 | fuse_writepage_finish(fc, req); | |
1211 | spin_unlock(&fc->lock); | |
1212 | fuse_writepage_free(fc, req); | |
1213 | } | |
1214 | ||
1215 | static int fuse_writepage_locked(struct page *page) | |
1216 | { | |
1217 | struct address_space *mapping = page->mapping; | |
1218 | struct inode *inode = mapping->host; | |
1219 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1220 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1221 | struct fuse_req *req; | |
1222 | struct fuse_file *ff; | |
1223 | struct page *tmp_page; | |
1224 | ||
1225 | set_page_writeback(page); | |
1226 | ||
1227 | req = fuse_request_alloc_nofs(); | |
1228 | if (!req) | |
1229 | goto err; | |
1230 | ||
1231 | tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
1232 | if (!tmp_page) | |
1233 | goto err_free; | |
1234 | ||
1235 | spin_lock(&fc->lock); | |
1236 | BUG_ON(list_empty(&fi->write_files)); | |
1237 | ff = list_entry(fi->write_files.next, struct fuse_file, write_entry); | |
1238 | req->ff = fuse_file_get(ff); | |
1239 | spin_unlock(&fc->lock); | |
1240 | ||
2106cb18 | 1241 | fuse_write_fill(req, ff, page_offset(page), 0); |
3be5a52b MS |
1242 | |
1243 | copy_highpage(tmp_page, page); | |
2d698b07 | 1244 | req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; |
f4975c67 | 1245 | req->in.argpages = 1; |
3be5a52b MS |
1246 | req->num_pages = 1; |
1247 | req->pages[0] = tmp_page; | |
1248 | req->page_offset = 0; | |
1249 | req->end = fuse_writepage_end; | |
1250 | req->inode = inode; | |
1251 | ||
1252 | inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK); | |
1253 | inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP); | |
1254 | end_page_writeback(page); | |
1255 | ||
1256 | spin_lock(&fc->lock); | |
1257 | list_add(&req->writepages_entry, &fi->writepages); | |
1258 | list_add_tail(&req->list, &fi->queued_writes); | |
1259 | fuse_flush_writepages(inode); | |
1260 | spin_unlock(&fc->lock); | |
1261 | ||
1262 | return 0; | |
1263 | ||
1264 | err_free: | |
1265 | fuse_request_free(req); | |
1266 | err: | |
1267 | end_page_writeback(page); | |
1268 | return -ENOMEM; | |
1269 | } | |
1270 | ||
1271 | static int fuse_writepage(struct page *page, struct writeback_control *wbc) | |
1272 | { | |
1273 | int err; | |
1274 | ||
1275 | err = fuse_writepage_locked(page); | |
1276 | unlock_page(page); | |
1277 | ||
1278 | return err; | |
1279 | } | |
1280 | ||
1281 | static int fuse_launder_page(struct page *page) | |
1282 | { | |
1283 | int err = 0; | |
1284 | if (clear_page_dirty_for_io(page)) { | |
1285 | struct inode *inode = page->mapping->host; | |
1286 | err = fuse_writepage_locked(page); | |
1287 | if (!err) | |
1288 | fuse_wait_on_page_writeback(inode, page->index); | |
1289 | } | |
1290 | return err; | |
1291 | } | |
1292 | ||
1293 | /* | |
1294 | * Write back dirty pages now, because there may not be any suitable | |
1295 | * open files later | |
1296 | */ | |
1297 | static void fuse_vma_close(struct vm_area_struct *vma) | |
1298 | { | |
1299 | filemap_write_and_wait(vma->vm_file->f_mapping); | |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * Wait for writeback against this page to complete before allowing it | |
1304 | * to be marked dirty again, and hence written back again, possibly | |
1305 | * before the previous writepage completed. | |
1306 | * | |
1307 | * Block here, instead of in ->writepage(), so that the userspace fs | |
1308 | * can only block processes actually operating on the filesystem. | |
1309 | * | |
1310 | * Otherwise unprivileged userspace fs would be able to block | |
1311 | * unrelated: | |
1312 | * | |
1313 | * - page migration | |
1314 | * - sync(2) | |
1315 | * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER | |
1316 | */ | |
c2ec175c | 1317 | static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
3be5a52b | 1318 | { |
c2ec175c | 1319 | struct page *page = vmf->page; |
3be5a52b MS |
1320 | /* |
1321 | * Don't use page->mapping as it may become NULL from a | |
1322 | * concurrent truncate. | |
1323 | */ | |
1324 | struct inode *inode = vma->vm_file->f_mapping->host; | |
1325 | ||
1326 | fuse_wait_on_page_writeback(inode, page->index); | |
1327 | return 0; | |
1328 | } | |
1329 | ||
f0f37e2f | 1330 | static const struct vm_operations_struct fuse_file_vm_ops = { |
3be5a52b MS |
1331 | .close = fuse_vma_close, |
1332 | .fault = filemap_fault, | |
1333 | .page_mkwrite = fuse_page_mkwrite, | |
1334 | }; | |
1335 | ||
1336 | static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1337 | { | |
1338 | if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) { | |
1339 | struct inode *inode = file->f_dentry->d_inode; | |
1340 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1341 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1342 | struct fuse_file *ff = file->private_data; | |
1343 | /* | |
1344 | * file may be written through mmap, so chain it onto the | |
1345 | * inodes's write_file list | |
1346 | */ | |
1347 | spin_lock(&fc->lock); | |
1348 | if (list_empty(&ff->write_entry)) | |
1349 | list_add(&ff->write_entry, &fi->write_files); | |
1350 | spin_unlock(&fc->lock); | |
1351 | } | |
1352 | file_accessed(file); | |
1353 | vma->vm_ops = &fuse_file_vm_ops; | |
b6aeaded MS |
1354 | return 0; |
1355 | } | |
1356 | ||
fc280c96 MS |
1357 | static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma) |
1358 | { | |
1359 | /* Can't provide the coherency needed for MAP_SHARED */ | |
1360 | if (vma->vm_flags & VM_MAYSHARE) | |
1361 | return -ENODEV; | |
1362 | ||
3121bfe7 MS |
1363 | invalidate_inode_pages2(file->f_mapping); |
1364 | ||
fc280c96 MS |
1365 | return generic_file_mmap(file, vma); |
1366 | } | |
1367 | ||
71421259 MS |
1368 | static int convert_fuse_file_lock(const struct fuse_file_lock *ffl, |
1369 | struct file_lock *fl) | |
1370 | { | |
1371 | switch (ffl->type) { | |
1372 | case F_UNLCK: | |
1373 | break; | |
1374 | ||
1375 | case F_RDLCK: | |
1376 | case F_WRLCK: | |
1377 | if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX || | |
1378 | ffl->end < ffl->start) | |
1379 | return -EIO; | |
1380 | ||
1381 | fl->fl_start = ffl->start; | |
1382 | fl->fl_end = ffl->end; | |
1383 | fl->fl_pid = ffl->pid; | |
1384 | break; | |
1385 | ||
1386 | default: | |
1387 | return -EIO; | |
1388 | } | |
1389 | fl->fl_type = ffl->type; | |
1390 | return 0; | |
1391 | } | |
1392 | ||
1393 | static void fuse_lk_fill(struct fuse_req *req, struct file *file, | |
a9ff4f87 MS |
1394 | const struct file_lock *fl, int opcode, pid_t pid, |
1395 | int flock) | |
71421259 | 1396 | { |
7706a9d6 | 1397 | struct inode *inode = file->f_path.dentry->d_inode; |
9c8ef561 | 1398 | struct fuse_conn *fc = get_fuse_conn(inode); |
71421259 MS |
1399 | struct fuse_file *ff = file->private_data; |
1400 | struct fuse_lk_in *arg = &req->misc.lk_in; | |
1401 | ||
1402 | arg->fh = ff->fh; | |
9c8ef561 | 1403 | arg->owner = fuse_lock_owner_id(fc, fl->fl_owner); |
71421259 MS |
1404 | arg->lk.start = fl->fl_start; |
1405 | arg->lk.end = fl->fl_end; | |
1406 | arg->lk.type = fl->fl_type; | |
1407 | arg->lk.pid = pid; | |
a9ff4f87 MS |
1408 | if (flock) |
1409 | arg->lk_flags |= FUSE_LK_FLOCK; | |
71421259 MS |
1410 | req->in.h.opcode = opcode; |
1411 | req->in.h.nodeid = get_node_id(inode); | |
1412 | req->in.numargs = 1; | |
1413 | req->in.args[0].size = sizeof(*arg); | |
1414 | req->in.args[0].value = arg; | |
1415 | } | |
1416 | ||
1417 | static int fuse_getlk(struct file *file, struct file_lock *fl) | |
1418 | { | |
7706a9d6 | 1419 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1420 | struct fuse_conn *fc = get_fuse_conn(inode); |
1421 | struct fuse_req *req; | |
1422 | struct fuse_lk_out outarg; | |
1423 | int err; | |
1424 | ||
1425 | req = fuse_get_req(fc); | |
1426 | if (IS_ERR(req)) | |
1427 | return PTR_ERR(req); | |
1428 | ||
a9ff4f87 | 1429 | fuse_lk_fill(req, file, fl, FUSE_GETLK, 0, 0); |
71421259 MS |
1430 | req->out.numargs = 1; |
1431 | req->out.args[0].size = sizeof(outarg); | |
1432 | req->out.args[0].value = &outarg; | |
b93f858a | 1433 | fuse_request_send(fc, req); |
71421259 MS |
1434 | err = req->out.h.error; |
1435 | fuse_put_request(fc, req); | |
1436 | if (!err) | |
1437 | err = convert_fuse_file_lock(&outarg.lk, fl); | |
1438 | ||
1439 | return err; | |
1440 | } | |
1441 | ||
a9ff4f87 | 1442 | static int fuse_setlk(struct file *file, struct file_lock *fl, int flock) |
71421259 | 1443 | { |
7706a9d6 | 1444 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1445 | struct fuse_conn *fc = get_fuse_conn(inode); |
1446 | struct fuse_req *req; | |
1447 | int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK; | |
1448 | pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0; | |
1449 | int err; | |
1450 | ||
8fb47a4f | 1451 | if (fl->fl_lmops && fl->fl_lmops->lm_grant) { |
48e90761 MS |
1452 | /* NLM needs asynchronous locks, which we don't support yet */ |
1453 | return -ENOLCK; | |
1454 | } | |
1455 | ||
71421259 MS |
1456 | /* Unlock on close is handled by the flush method */ |
1457 | if (fl->fl_flags & FL_CLOSE) | |
1458 | return 0; | |
1459 | ||
1460 | req = fuse_get_req(fc); | |
1461 | if (IS_ERR(req)) | |
1462 | return PTR_ERR(req); | |
1463 | ||
a9ff4f87 | 1464 | fuse_lk_fill(req, file, fl, opcode, pid, flock); |
b93f858a | 1465 | fuse_request_send(fc, req); |
71421259 | 1466 | err = req->out.h.error; |
a4d27e75 MS |
1467 | /* locking is restartable */ |
1468 | if (err == -EINTR) | |
1469 | err = -ERESTARTSYS; | |
71421259 MS |
1470 | fuse_put_request(fc, req); |
1471 | return err; | |
1472 | } | |
1473 | ||
1474 | static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) | |
1475 | { | |
7706a9d6 | 1476 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1477 | struct fuse_conn *fc = get_fuse_conn(inode); |
1478 | int err; | |
1479 | ||
48e90761 MS |
1480 | if (cmd == F_CANCELLK) { |
1481 | err = 0; | |
1482 | } else if (cmd == F_GETLK) { | |
71421259 | 1483 | if (fc->no_lock) { |
9d6a8c5c | 1484 | posix_test_lock(file, fl); |
71421259 MS |
1485 | err = 0; |
1486 | } else | |
1487 | err = fuse_getlk(file, fl); | |
1488 | } else { | |
1489 | if (fc->no_lock) | |
48e90761 | 1490 | err = posix_lock_file(file, fl, NULL); |
71421259 | 1491 | else |
a9ff4f87 | 1492 | err = fuse_setlk(file, fl, 0); |
71421259 MS |
1493 | } |
1494 | return err; | |
1495 | } | |
1496 | ||
a9ff4f87 MS |
1497 | static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl) |
1498 | { | |
1499 | struct inode *inode = file->f_path.dentry->d_inode; | |
1500 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1501 | int err; | |
1502 | ||
37fb3a30 | 1503 | if (fc->no_flock) { |
a9ff4f87 MS |
1504 | err = flock_lock_file_wait(file, fl); |
1505 | } else { | |
37fb3a30 MS |
1506 | struct fuse_file *ff = file->private_data; |
1507 | ||
a9ff4f87 MS |
1508 | /* emulate flock with POSIX locks */ |
1509 | fl->fl_owner = (fl_owner_t) file; | |
37fb3a30 | 1510 | ff->flock = true; |
a9ff4f87 MS |
1511 | err = fuse_setlk(file, fl, 1); |
1512 | } | |
1513 | ||
1514 | return err; | |
1515 | } | |
1516 | ||
b2d2272f MS |
1517 | static sector_t fuse_bmap(struct address_space *mapping, sector_t block) |
1518 | { | |
1519 | struct inode *inode = mapping->host; | |
1520 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1521 | struct fuse_req *req; | |
1522 | struct fuse_bmap_in inarg; | |
1523 | struct fuse_bmap_out outarg; | |
1524 | int err; | |
1525 | ||
1526 | if (!inode->i_sb->s_bdev || fc->no_bmap) | |
1527 | return 0; | |
1528 | ||
1529 | req = fuse_get_req(fc); | |
1530 | if (IS_ERR(req)) | |
1531 | return 0; | |
1532 | ||
1533 | memset(&inarg, 0, sizeof(inarg)); | |
1534 | inarg.block = block; | |
1535 | inarg.blocksize = inode->i_sb->s_blocksize; | |
1536 | req->in.h.opcode = FUSE_BMAP; | |
1537 | req->in.h.nodeid = get_node_id(inode); | |
1538 | req->in.numargs = 1; | |
1539 | req->in.args[0].size = sizeof(inarg); | |
1540 | req->in.args[0].value = &inarg; | |
1541 | req->out.numargs = 1; | |
1542 | req->out.args[0].size = sizeof(outarg); | |
1543 | req->out.args[0].value = &outarg; | |
b93f858a | 1544 | fuse_request_send(fc, req); |
b2d2272f MS |
1545 | err = req->out.h.error; |
1546 | fuse_put_request(fc, req); | |
1547 | if (err == -ENOSYS) | |
1548 | fc->no_bmap = 1; | |
1549 | ||
1550 | return err ? 0 : outarg.block; | |
1551 | } | |
1552 | ||
5559b8f4 MS |
1553 | static loff_t fuse_file_llseek(struct file *file, loff_t offset, int origin) |
1554 | { | |
1555 | loff_t retval; | |
1556 | struct inode *inode = file->f_path.dentry->d_inode; | |
1557 | ||
1558 | mutex_lock(&inode->i_mutex); | |
b48c6af2 | 1559 | if (origin != SEEK_CUR && origin != SEEK_SET) { |
769415c6 MS |
1560 | retval = fuse_update_attributes(inode, NULL, file, NULL); |
1561 | if (retval) | |
5291658d | 1562 | goto exit; |
06222e49 JB |
1563 | } |
1564 | ||
1565 | switch (origin) { | |
1566 | case SEEK_END: | |
5559b8f4 MS |
1567 | offset += i_size_read(inode); |
1568 | break; | |
1569 | case SEEK_CUR: | |
73104b6e MS |
1570 | if (offset == 0) { |
1571 | retval = file->f_pos; | |
1572 | goto exit; | |
1573 | } | |
5559b8f4 | 1574 | offset += file->f_pos; |
06222e49 JB |
1575 | break; |
1576 | case SEEK_DATA: | |
1577 | if (offset >= i_size_read(inode)) { | |
1578 | retval = -ENXIO; | |
1579 | goto exit; | |
1580 | } | |
1581 | break; | |
1582 | case SEEK_HOLE: | |
1583 | if (offset >= i_size_read(inode)) { | |
1584 | retval = -ENXIO; | |
1585 | goto exit; | |
1586 | } | |
1587 | offset = i_size_read(inode); | |
1588 | break; | |
5559b8f4 MS |
1589 | } |
1590 | retval = -EINVAL; | |
1591 | if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { | |
1592 | if (offset != file->f_pos) { | |
1593 | file->f_pos = offset; | |
1594 | file->f_version = 0; | |
1595 | } | |
1596 | retval = offset; | |
1597 | } | |
5291658d | 1598 | exit: |
5559b8f4 MS |
1599 | mutex_unlock(&inode->i_mutex); |
1600 | return retval; | |
1601 | } | |
1602 | ||
59efec7b TH |
1603 | static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov, |
1604 | unsigned int nr_segs, size_t bytes, bool to_user) | |
1605 | { | |
1606 | struct iov_iter ii; | |
1607 | int page_idx = 0; | |
1608 | ||
1609 | if (!bytes) | |
1610 | return 0; | |
1611 | ||
1612 | iov_iter_init(&ii, iov, nr_segs, bytes, 0); | |
1613 | ||
1614 | while (iov_iter_count(&ii)) { | |
1615 | struct page *page = pages[page_idx++]; | |
1616 | size_t todo = min_t(size_t, PAGE_SIZE, iov_iter_count(&ii)); | |
4aa0edd2 | 1617 | void *kaddr; |
59efec7b | 1618 | |
4aa0edd2 | 1619 | kaddr = kmap(page); |
59efec7b TH |
1620 | |
1621 | while (todo) { | |
1622 | char __user *uaddr = ii.iov->iov_base + ii.iov_offset; | |
1623 | size_t iov_len = ii.iov->iov_len - ii.iov_offset; | |
1624 | size_t copy = min(todo, iov_len); | |
1625 | size_t left; | |
1626 | ||
1627 | if (!to_user) | |
1628 | left = copy_from_user(kaddr, uaddr, copy); | |
1629 | else | |
1630 | left = copy_to_user(uaddr, kaddr, copy); | |
1631 | ||
1632 | if (unlikely(left)) | |
1633 | return -EFAULT; | |
1634 | ||
1635 | iov_iter_advance(&ii, copy); | |
1636 | todo -= copy; | |
1637 | kaddr += copy; | |
1638 | } | |
1639 | ||
0bd87182 | 1640 | kunmap(page); |
59efec7b TH |
1641 | } |
1642 | ||
1643 | return 0; | |
1644 | } | |
1645 | ||
d9d318d3 MS |
1646 | /* |
1647 | * CUSE servers compiled on 32bit broke on 64bit kernels because the | |
1648 | * ABI was defined to be 'struct iovec' which is different on 32bit | |
1649 | * and 64bit. Fortunately we can determine which structure the server | |
1650 | * used from the size of the reply. | |
1651 | */ | |
1baa26b2 MS |
1652 | static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src, |
1653 | size_t transferred, unsigned count, | |
1654 | bool is_compat) | |
d9d318d3 MS |
1655 | { |
1656 | #ifdef CONFIG_COMPAT | |
1657 | if (count * sizeof(struct compat_iovec) == transferred) { | |
1658 | struct compat_iovec *ciov = src; | |
1659 | unsigned i; | |
1660 | ||
1661 | /* | |
1662 | * With this interface a 32bit server cannot support | |
1663 | * non-compat (i.e. ones coming from 64bit apps) ioctl | |
1664 | * requests | |
1665 | */ | |
1666 | if (!is_compat) | |
1667 | return -EINVAL; | |
1668 | ||
1669 | for (i = 0; i < count; i++) { | |
1670 | dst[i].iov_base = compat_ptr(ciov[i].iov_base); | |
1671 | dst[i].iov_len = ciov[i].iov_len; | |
1672 | } | |
1673 | return 0; | |
1674 | } | |
1675 | #endif | |
1676 | ||
1677 | if (count * sizeof(struct iovec) != transferred) | |
1678 | return -EIO; | |
1679 | ||
1680 | memcpy(dst, src, transferred); | |
1681 | return 0; | |
1682 | } | |
1683 | ||
7572777e MS |
1684 | /* Make sure iov_length() won't overflow */ |
1685 | static int fuse_verify_ioctl_iov(struct iovec *iov, size_t count) | |
1686 | { | |
1687 | size_t n; | |
1688 | u32 max = FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT; | |
1689 | ||
1690 | for (n = 0; n < count; n++) { | |
1691 | if (iov->iov_len > (size_t) max) | |
1692 | return -ENOMEM; | |
1693 | max -= iov->iov_len; | |
1694 | } | |
1695 | return 0; | |
1696 | } | |
1697 | ||
1baa26b2 MS |
1698 | static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst, |
1699 | void *src, size_t transferred, unsigned count, | |
1700 | bool is_compat) | |
1701 | { | |
1702 | unsigned i; | |
1703 | struct fuse_ioctl_iovec *fiov = src; | |
1704 | ||
1705 | if (fc->minor < 16) { | |
1706 | return fuse_copy_ioctl_iovec_old(dst, src, transferred, | |
1707 | count, is_compat); | |
1708 | } | |
1709 | ||
1710 | if (count * sizeof(struct fuse_ioctl_iovec) != transferred) | |
1711 | return -EIO; | |
1712 | ||
1713 | for (i = 0; i < count; i++) { | |
1714 | /* Did the server supply an inappropriate value? */ | |
1715 | if (fiov[i].base != (unsigned long) fiov[i].base || | |
1716 | fiov[i].len != (unsigned long) fiov[i].len) | |
1717 | return -EIO; | |
1718 | ||
1719 | dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base; | |
1720 | dst[i].iov_len = (size_t) fiov[i].len; | |
1721 | ||
1722 | #ifdef CONFIG_COMPAT | |
1723 | if (is_compat && | |
1724 | (ptr_to_compat(dst[i].iov_base) != fiov[i].base || | |
1725 | (compat_size_t) dst[i].iov_len != fiov[i].len)) | |
1726 | return -EIO; | |
1727 | #endif | |
1728 | } | |
1729 | ||
1730 | return 0; | |
1731 | } | |
1732 | ||
1733 | ||
59efec7b TH |
1734 | /* |
1735 | * For ioctls, there is no generic way to determine how much memory | |
1736 | * needs to be read and/or written. Furthermore, ioctls are allowed | |
1737 | * to dereference the passed pointer, so the parameter requires deep | |
1738 | * copying but FUSE has no idea whatsoever about what to copy in or | |
1739 | * out. | |
1740 | * | |
1741 | * This is solved by allowing FUSE server to retry ioctl with | |
1742 | * necessary in/out iovecs. Let's assume the ioctl implementation | |
1743 | * needs to read in the following structure. | |
1744 | * | |
1745 | * struct a { | |
1746 | * char *buf; | |
1747 | * size_t buflen; | |
1748 | * } | |
1749 | * | |
1750 | * On the first callout to FUSE server, inarg->in_size and | |
1751 | * inarg->out_size will be NULL; then, the server completes the ioctl | |
1752 | * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and | |
1753 | * the actual iov array to | |
1754 | * | |
1755 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } } | |
1756 | * | |
1757 | * which tells FUSE to copy in the requested area and retry the ioctl. | |
1758 | * On the second round, the server has access to the structure and | |
1759 | * from that it can tell what to look for next, so on the invocation, | |
1760 | * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to | |
1761 | * | |
1762 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) }, | |
1763 | * { .iov_base = a.buf, .iov_len = a.buflen } } | |
1764 | * | |
1765 | * FUSE will copy both struct a and the pointed buffer from the | |
1766 | * process doing the ioctl and retry ioctl with both struct a and the | |
1767 | * buffer. | |
1768 | * | |
1769 | * This time, FUSE server has everything it needs and completes ioctl | |
1770 | * without FUSE_IOCTL_RETRY which finishes the ioctl call. | |
1771 | * | |
1772 | * Copying data out works the same way. | |
1773 | * | |
1774 | * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel | |
1775 | * automatically initializes in and out iovs by decoding @cmd with | |
1776 | * _IOC_* macros and the server is not allowed to request RETRY. This | |
1777 | * limits ioctl data transfers to well-formed ioctls and is the forced | |
1778 | * behavior for all FUSE servers. | |
1779 | */ | |
08cbf542 TH |
1780 | long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, |
1781 | unsigned int flags) | |
59efec7b | 1782 | { |
59efec7b | 1783 | struct fuse_file *ff = file->private_data; |
d36f2487 | 1784 | struct fuse_conn *fc = ff->fc; |
59efec7b TH |
1785 | struct fuse_ioctl_in inarg = { |
1786 | .fh = ff->fh, | |
1787 | .cmd = cmd, | |
1788 | .arg = arg, | |
1789 | .flags = flags | |
1790 | }; | |
1791 | struct fuse_ioctl_out outarg; | |
1792 | struct fuse_req *req = NULL; | |
1793 | struct page **pages = NULL; | |
8ac83505 | 1794 | struct iovec *iov_page = NULL; |
59efec7b TH |
1795 | struct iovec *in_iov = NULL, *out_iov = NULL; |
1796 | unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages; | |
1797 | size_t in_size, out_size, transferred; | |
1798 | int err; | |
1799 | ||
1baa26b2 MS |
1800 | #if BITS_PER_LONG == 32 |
1801 | inarg.flags |= FUSE_IOCTL_32BIT; | |
1802 | #else | |
1803 | if (flags & FUSE_IOCTL_COMPAT) | |
1804 | inarg.flags |= FUSE_IOCTL_32BIT; | |
1805 | #endif | |
1806 | ||
59efec7b | 1807 | /* assume all the iovs returned by client always fits in a page */ |
1baa26b2 | 1808 | BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE); |
59efec7b | 1809 | |
59efec7b TH |
1810 | err = -ENOMEM; |
1811 | pages = kzalloc(sizeof(pages[0]) * FUSE_MAX_PAGES_PER_REQ, GFP_KERNEL); | |
8ac83505 | 1812 | iov_page = (struct iovec *) __get_free_page(GFP_KERNEL); |
59efec7b TH |
1813 | if (!pages || !iov_page) |
1814 | goto out; | |
1815 | ||
1816 | /* | |
1817 | * If restricted, initialize IO parameters as encoded in @cmd. | |
1818 | * RETRY from server is not allowed. | |
1819 | */ | |
1820 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) { | |
8ac83505 | 1821 | struct iovec *iov = iov_page; |
59efec7b | 1822 | |
c9f0523d | 1823 | iov->iov_base = (void __user *)arg; |
59efec7b TH |
1824 | iov->iov_len = _IOC_SIZE(cmd); |
1825 | ||
1826 | if (_IOC_DIR(cmd) & _IOC_WRITE) { | |
1827 | in_iov = iov; | |
1828 | in_iovs = 1; | |
1829 | } | |
1830 | ||
1831 | if (_IOC_DIR(cmd) & _IOC_READ) { | |
1832 | out_iov = iov; | |
1833 | out_iovs = 1; | |
1834 | } | |
1835 | } | |
1836 | ||
1837 | retry: | |
1838 | inarg.in_size = in_size = iov_length(in_iov, in_iovs); | |
1839 | inarg.out_size = out_size = iov_length(out_iov, out_iovs); | |
1840 | ||
1841 | /* | |
1842 | * Out data can be used either for actual out data or iovs, | |
1843 | * make sure there always is at least one page. | |
1844 | */ | |
1845 | out_size = max_t(size_t, out_size, PAGE_SIZE); | |
1846 | max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE); | |
1847 | ||
1848 | /* make sure there are enough buffer pages and init request with them */ | |
1849 | err = -ENOMEM; | |
1850 | if (max_pages > FUSE_MAX_PAGES_PER_REQ) | |
1851 | goto out; | |
1852 | while (num_pages < max_pages) { | |
1853 | pages[num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM); | |
1854 | if (!pages[num_pages]) | |
1855 | goto out; | |
1856 | num_pages++; | |
1857 | } | |
1858 | ||
1859 | req = fuse_get_req(fc); | |
1860 | if (IS_ERR(req)) { | |
1861 | err = PTR_ERR(req); | |
1862 | req = NULL; | |
1863 | goto out; | |
1864 | } | |
1865 | memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages); | |
1866 | req->num_pages = num_pages; | |
1867 | ||
1868 | /* okay, let's send it to the client */ | |
1869 | req->in.h.opcode = FUSE_IOCTL; | |
d36f2487 | 1870 | req->in.h.nodeid = ff->nodeid; |
59efec7b TH |
1871 | req->in.numargs = 1; |
1872 | req->in.args[0].size = sizeof(inarg); | |
1873 | req->in.args[0].value = &inarg; | |
1874 | if (in_size) { | |
1875 | req->in.numargs++; | |
1876 | req->in.args[1].size = in_size; | |
1877 | req->in.argpages = 1; | |
1878 | ||
1879 | err = fuse_ioctl_copy_user(pages, in_iov, in_iovs, in_size, | |
1880 | false); | |
1881 | if (err) | |
1882 | goto out; | |
1883 | } | |
1884 | ||
1885 | req->out.numargs = 2; | |
1886 | req->out.args[0].size = sizeof(outarg); | |
1887 | req->out.args[0].value = &outarg; | |
1888 | req->out.args[1].size = out_size; | |
1889 | req->out.argpages = 1; | |
1890 | req->out.argvar = 1; | |
1891 | ||
b93f858a | 1892 | fuse_request_send(fc, req); |
59efec7b TH |
1893 | err = req->out.h.error; |
1894 | transferred = req->out.args[1].size; | |
1895 | fuse_put_request(fc, req); | |
1896 | req = NULL; | |
1897 | if (err) | |
1898 | goto out; | |
1899 | ||
1900 | /* did it ask for retry? */ | |
1901 | if (outarg.flags & FUSE_IOCTL_RETRY) { | |
8ac83505 | 1902 | void *vaddr; |
59efec7b TH |
1903 | |
1904 | /* no retry if in restricted mode */ | |
1905 | err = -EIO; | |
1906 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) | |
1907 | goto out; | |
1908 | ||
1909 | in_iovs = outarg.in_iovs; | |
1910 | out_iovs = outarg.out_iovs; | |
1911 | ||
1912 | /* | |
1913 | * Make sure things are in boundary, separate checks | |
1914 | * are to protect against overflow. | |
1915 | */ | |
1916 | err = -ENOMEM; | |
1917 | if (in_iovs > FUSE_IOCTL_MAX_IOV || | |
1918 | out_iovs > FUSE_IOCTL_MAX_IOV || | |
1919 | in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV) | |
1920 | goto out; | |
1921 | ||
59efec7b | 1922 | vaddr = kmap_atomic(pages[0], KM_USER0); |
1baa26b2 | 1923 | err = fuse_copy_ioctl_iovec(fc, iov_page, vaddr, |
d9d318d3 MS |
1924 | transferred, in_iovs + out_iovs, |
1925 | (flags & FUSE_IOCTL_COMPAT) != 0); | |
59efec7b | 1926 | kunmap_atomic(vaddr, KM_USER0); |
d9d318d3 MS |
1927 | if (err) |
1928 | goto out; | |
59efec7b | 1929 | |
8ac83505 | 1930 | in_iov = iov_page; |
59efec7b TH |
1931 | out_iov = in_iov + in_iovs; |
1932 | ||
7572777e MS |
1933 | err = fuse_verify_ioctl_iov(in_iov, in_iovs); |
1934 | if (err) | |
1935 | goto out; | |
1936 | ||
1937 | err = fuse_verify_ioctl_iov(out_iov, out_iovs); | |
1938 | if (err) | |
1939 | goto out; | |
1940 | ||
59efec7b TH |
1941 | goto retry; |
1942 | } | |
1943 | ||
1944 | err = -EIO; | |
1945 | if (transferred > inarg.out_size) | |
1946 | goto out; | |
1947 | ||
1948 | err = fuse_ioctl_copy_user(pages, out_iov, out_iovs, transferred, true); | |
1949 | out: | |
1950 | if (req) | |
1951 | fuse_put_request(fc, req); | |
8ac83505 | 1952 | free_page((unsigned long) iov_page); |
59efec7b TH |
1953 | while (num_pages) |
1954 | __free_page(pages[--num_pages]); | |
1955 | kfree(pages); | |
1956 | ||
1957 | return err ? err : outarg.result; | |
1958 | } | |
08cbf542 | 1959 | EXPORT_SYMBOL_GPL(fuse_do_ioctl); |
59efec7b | 1960 | |
d36f2487 MS |
1961 | static long fuse_file_ioctl_common(struct file *file, unsigned int cmd, |
1962 | unsigned long arg, unsigned int flags) | |
1963 | { | |
1964 | struct inode *inode = file->f_dentry->d_inode; | |
1965 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1966 | ||
1967 | if (!fuse_allow_task(fc, current)) | |
1968 | return -EACCES; | |
1969 | ||
1970 | if (is_bad_inode(inode)) | |
1971 | return -EIO; | |
1972 | ||
1973 | return fuse_do_ioctl(file, cmd, arg, flags); | |
1974 | } | |
1975 | ||
59efec7b TH |
1976 | static long fuse_file_ioctl(struct file *file, unsigned int cmd, |
1977 | unsigned long arg) | |
1978 | { | |
d36f2487 | 1979 | return fuse_file_ioctl_common(file, cmd, arg, 0); |
59efec7b TH |
1980 | } |
1981 | ||
1982 | static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd, | |
1983 | unsigned long arg) | |
1984 | { | |
d36f2487 | 1985 | return fuse_file_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT); |
59efec7b TH |
1986 | } |
1987 | ||
95668a69 TH |
1988 | /* |
1989 | * All files which have been polled are linked to RB tree | |
1990 | * fuse_conn->polled_files which is indexed by kh. Walk the tree and | |
1991 | * find the matching one. | |
1992 | */ | |
1993 | static struct rb_node **fuse_find_polled_node(struct fuse_conn *fc, u64 kh, | |
1994 | struct rb_node **parent_out) | |
1995 | { | |
1996 | struct rb_node **link = &fc->polled_files.rb_node; | |
1997 | struct rb_node *last = NULL; | |
1998 | ||
1999 | while (*link) { | |
2000 | struct fuse_file *ff; | |
2001 | ||
2002 | last = *link; | |
2003 | ff = rb_entry(last, struct fuse_file, polled_node); | |
2004 | ||
2005 | if (kh < ff->kh) | |
2006 | link = &last->rb_left; | |
2007 | else if (kh > ff->kh) | |
2008 | link = &last->rb_right; | |
2009 | else | |
2010 | return link; | |
2011 | } | |
2012 | ||
2013 | if (parent_out) | |
2014 | *parent_out = last; | |
2015 | return link; | |
2016 | } | |
2017 | ||
2018 | /* | |
2019 | * The file is about to be polled. Make sure it's on the polled_files | |
2020 | * RB tree. Note that files once added to the polled_files tree are | |
2021 | * not removed before the file is released. This is because a file | |
2022 | * polled once is likely to be polled again. | |
2023 | */ | |
2024 | static void fuse_register_polled_file(struct fuse_conn *fc, | |
2025 | struct fuse_file *ff) | |
2026 | { | |
2027 | spin_lock(&fc->lock); | |
2028 | if (RB_EMPTY_NODE(&ff->polled_node)) { | |
2029 | struct rb_node **link, *parent; | |
2030 | ||
2031 | link = fuse_find_polled_node(fc, ff->kh, &parent); | |
2032 | BUG_ON(*link); | |
2033 | rb_link_node(&ff->polled_node, parent, link); | |
2034 | rb_insert_color(&ff->polled_node, &fc->polled_files); | |
2035 | } | |
2036 | spin_unlock(&fc->lock); | |
2037 | } | |
2038 | ||
08cbf542 | 2039 | unsigned fuse_file_poll(struct file *file, poll_table *wait) |
95668a69 | 2040 | { |
95668a69 | 2041 | struct fuse_file *ff = file->private_data; |
797759aa | 2042 | struct fuse_conn *fc = ff->fc; |
95668a69 TH |
2043 | struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh }; |
2044 | struct fuse_poll_out outarg; | |
2045 | struct fuse_req *req; | |
2046 | int err; | |
2047 | ||
2048 | if (fc->no_poll) | |
2049 | return DEFAULT_POLLMASK; | |
2050 | ||
2051 | poll_wait(file, &ff->poll_wait, wait); | |
2052 | ||
2053 | /* | |
2054 | * Ask for notification iff there's someone waiting for it. | |
2055 | * The client may ignore the flag and always notify. | |
2056 | */ | |
2057 | if (waitqueue_active(&ff->poll_wait)) { | |
2058 | inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY; | |
2059 | fuse_register_polled_file(fc, ff); | |
2060 | } | |
2061 | ||
2062 | req = fuse_get_req(fc); | |
2063 | if (IS_ERR(req)) | |
201fa69a | 2064 | return POLLERR; |
95668a69 TH |
2065 | |
2066 | req->in.h.opcode = FUSE_POLL; | |
797759aa | 2067 | req->in.h.nodeid = ff->nodeid; |
95668a69 TH |
2068 | req->in.numargs = 1; |
2069 | req->in.args[0].size = sizeof(inarg); | |
2070 | req->in.args[0].value = &inarg; | |
2071 | req->out.numargs = 1; | |
2072 | req->out.args[0].size = sizeof(outarg); | |
2073 | req->out.args[0].value = &outarg; | |
b93f858a | 2074 | fuse_request_send(fc, req); |
95668a69 TH |
2075 | err = req->out.h.error; |
2076 | fuse_put_request(fc, req); | |
2077 | ||
2078 | if (!err) | |
2079 | return outarg.revents; | |
2080 | if (err == -ENOSYS) { | |
2081 | fc->no_poll = 1; | |
2082 | return DEFAULT_POLLMASK; | |
2083 | } | |
2084 | return POLLERR; | |
2085 | } | |
08cbf542 | 2086 | EXPORT_SYMBOL_GPL(fuse_file_poll); |
95668a69 TH |
2087 | |
2088 | /* | |
2089 | * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and | |
2090 | * wakes up the poll waiters. | |
2091 | */ | |
2092 | int fuse_notify_poll_wakeup(struct fuse_conn *fc, | |
2093 | struct fuse_notify_poll_wakeup_out *outarg) | |
2094 | { | |
2095 | u64 kh = outarg->kh; | |
2096 | struct rb_node **link; | |
2097 | ||
2098 | spin_lock(&fc->lock); | |
2099 | ||
2100 | link = fuse_find_polled_node(fc, kh, NULL); | |
2101 | if (*link) { | |
2102 | struct fuse_file *ff; | |
2103 | ||
2104 | ff = rb_entry(*link, struct fuse_file, polled_node); | |
2105 | wake_up_interruptible_sync(&ff->poll_wait); | |
2106 | } | |
2107 | ||
2108 | spin_unlock(&fc->lock); | |
2109 | return 0; | |
2110 | } | |
2111 | ||
4b6f5d20 | 2112 | static const struct file_operations fuse_file_operations = { |
5559b8f4 | 2113 | .llseek = fuse_file_llseek, |
543ade1f | 2114 | .read = do_sync_read, |
bcb4be80 | 2115 | .aio_read = fuse_file_aio_read, |
543ade1f | 2116 | .write = do_sync_write, |
ea9b9907 | 2117 | .aio_write = fuse_file_aio_write, |
b6aeaded MS |
2118 | .mmap = fuse_file_mmap, |
2119 | .open = fuse_open, | |
2120 | .flush = fuse_flush, | |
2121 | .release = fuse_release, | |
2122 | .fsync = fuse_fsync, | |
71421259 | 2123 | .lock = fuse_file_lock, |
a9ff4f87 | 2124 | .flock = fuse_file_flock, |
5ffc4ef4 | 2125 | .splice_read = generic_file_splice_read, |
59efec7b TH |
2126 | .unlocked_ioctl = fuse_file_ioctl, |
2127 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 2128 | .poll = fuse_file_poll, |
b6aeaded MS |
2129 | }; |
2130 | ||
4b6f5d20 | 2131 | static const struct file_operations fuse_direct_io_file_operations = { |
5559b8f4 | 2132 | .llseek = fuse_file_llseek, |
413ef8cb MS |
2133 | .read = fuse_direct_read, |
2134 | .write = fuse_direct_write, | |
fc280c96 | 2135 | .mmap = fuse_direct_mmap, |
413ef8cb MS |
2136 | .open = fuse_open, |
2137 | .flush = fuse_flush, | |
2138 | .release = fuse_release, | |
2139 | .fsync = fuse_fsync, | |
71421259 | 2140 | .lock = fuse_file_lock, |
a9ff4f87 | 2141 | .flock = fuse_file_flock, |
59efec7b TH |
2142 | .unlocked_ioctl = fuse_file_ioctl, |
2143 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 2144 | .poll = fuse_file_poll, |
fc280c96 | 2145 | /* no splice_read */ |
413ef8cb MS |
2146 | }; |
2147 | ||
f5e54d6e | 2148 | static const struct address_space_operations fuse_file_aops = { |
b6aeaded | 2149 | .readpage = fuse_readpage, |
3be5a52b MS |
2150 | .writepage = fuse_writepage, |
2151 | .launder_page = fuse_launder_page, | |
db50b96c | 2152 | .readpages = fuse_readpages, |
3be5a52b | 2153 | .set_page_dirty = __set_page_dirty_nobuffers, |
b2d2272f | 2154 | .bmap = fuse_bmap, |
b6aeaded MS |
2155 | }; |
2156 | ||
2157 | void fuse_init_file_inode(struct inode *inode) | |
2158 | { | |
45323fb7 MS |
2159 | inode->i_fop = &fuse_file_operations; |
2160 | inode->i_data.a_ops = &fuse_file_aops; | |
b6aeaded | 2161 | } |