Commit | Line | Data |
---|---|---|
b6aeaded MS |
1 | /* |
2 | FUSE: Filesystem in Userspace | |
1729a16c | 3 | Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> |
b6aeaded MS |
4 | |
5 | This program can be distributed under the terms of the GNU GPL. | |
6 | See the file COPYING. | |
7 | */ | |
8 | ||
9 | #include "fuse_i.h" | |
10 | ||
11 | #include <linux/pagemap.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/kernel.h> | |
e8edc6e0 | 14 | #include <linux/sched.h> |
08cbf542 | 15 | #include <linux/module.h> |
d9d318d3 | 16 | #include <linux/compat.h> |
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 | ||
b111c8c0 | 28 | req = fuse_get_req_nopages(fc); |
ce1d5a49 MS |
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; |
4250c066 | 60 | ff->reserved_req = fuse_request_alloc(0); |
6b2db28a TH |
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 MS |
196 | |
197 | err = generic_file_open(inode, file); | |
198 | if (err) | |
199 | return err; | |
200 | ||
91fe96b4 | 201 | err = fuse_do_open(fc, get_node_id(inode), file, isdir); |
fd72faac | 202 | if (err) |
91fe96b4 | 203 | return err; |
b6aeaded | 204 | |
91fe96b4 MS |
205 | fuse_finish_open(inode, file); |
206 | ||
207 | return 0; | |
b6aeaded MS |
208 | } |
209 | ||
8b0797a4 | 210 | static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode) |
64c6d8ed | 211 | { |
8b0797a4 | 212 | struct fuse_conn *fc = ff->fc; |
33649c91 | 213 | struct fuse_req *req = ff->reserved_req; |
b57d4264 | 214 | struct fuse_release_in *inarg = &req->misc.release.in; |
b6aeaded | 215 | |
8b0797a4 MS |
216 | spin_lock(&fc->lock); |
217 | list_del(&ff->write_entry); | |
218 | if (!RB_EMPTY_NODE(&ff->polled_node)) | |
219 | rb_erase(&ff->polled_node, &fc->polled_files); | |
220 | spin_unlock(&fc->lock); | |
221 | ||
357ccf2b | 222 | wake_up_interruptible_all(&ff->poll_wait); |
8b0797a4 | 223 | |
b6aeaded | 224 | inarg->fh = ff->fh; |
fd72faac | 225 | inarg->flags = flags; |
51eb01e7 | 226 | req->in.h.opcode = opcode; |
c7b7143c | 227 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
228 | req->in.numargs = 1; |
229 | req->in.args[0].size = sizeof(struct fuse_release_in); | |
230 | req->in.args[0].value = inarg; | |
fd72faac MS |
231 | } |
232 | ||
8b0797a4 | 233 | void fuse_release_common(struct file *file, int opcode) |
fd72faac | 234 | { |
6b2db28a TH |
235 | struct fuse_file *ff; |
236 | struct fuse_req *req; | |
b6aeaded | 237 | |
6b2db28a TH |
238 | ff = file->private_data; |
239 | if (unlikely(!ff)) | |
8b0797a4 | 240 | return; |
6b2db28a | 241 | |
6b2db28a | 242 | req = ff->reserved_req; |
8b0797a4 | 243 | fuse_prepare_release(ff, file->f_flags, opcode); |
6b2db28a | 244 | |
37fb3a30 MS |
245 | if (ff->flock) { |
246 | struct fuse_release_in *inarg = &req->misc.release.in; | |
247 | inarg->release_flags |= FUSE_RELEASE_FLOCK_UNLOCK; | |
248 | inarg->lock_owner = fuse_lock_owner_id(ff->fc, | |
249 | (fl_owner_t) file); | |
250 | } | |
6b2db28a | 251 | /* Hold vfsmount and dentry until release is finished */ |
b0be46eb MS |
252 | path_get(&file->f_path); |
253 | req->misc.release.path = file->f_path; | |
6b2db28a | 254 | |
6b2db28a TH |
255 | /* |
256 | * Normally this will send the RELEASE request, however if | |
257 | * some asynchronous READ or WRITE requests are outstanding, | |
258 | * the sending will be delayed. | |
5a18ec17 MS |
259 | * |
260 | * Make the release synchronous if this is a fuseblk mount, | |
261 | * synchronous RELEASE is allowed (and desirable) in this case | |
262 | * because the server can be trusted not to screw up. | |
6b2db28a | 263 | */ |
5a18ec17 | 264 | fuse_file_put(ff, ff->fc->destroy_req != NULL); |
b6aeaded MS |
265 | } |
266 | ||
04730fef MS |
267 | static int fuse_open(struct inode *inode, struct file *file) |
268 | { | |
91fe96b4 | 269 | return fuse_open_common(inode, file, false); |
04730fef MS |
270 | } |
271 | ||
272 | static int fuse_release(struct inode *inode, struct file *file) | |
273 | { | |
8b0797a4 MS |
274 | fuse_release_common(file, FUSE_RELEASE); |
275 | ||
276 | /* return value is ignored by VFS */ | |
277 | return 0; | |
278 | } | |
279 | ||
280 | void fuse_sync_release(struct fuse_file *ff, int flags) | |
281 | { | |
282 | WARN_ON(atomic_read(&ff->count) > 1); | |
283 | fuse_prepare_release(ff, flags, FUSE_RELEASE); | |
284 | ff->reserved_req->force = 1; | |
285 | fuse_request_send(ff->fc, ff->reserved_req); | |
286 | fuse_put_request(ff->fc, ff->reserved_req); | |
287 | kfree(ff); | |
04730fef | 288 | } |
08cbf542 | 289 | EXPORT_SYMBOL_GPL(fuse_sync_release); |
04730fef | 290 | |
71421259 | 291 | /* |
9c8ef561 MS |
292 | * Scramble the ID space with XTEA, so that the value of the files_struct |
293 | * pointer is not exposed to userspace. | |
71421259 | 294 | */ |
f3332114 | 295 | u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id) |
71421259 | 296 | { |
9c8ef561 MS |
297 | u32 *k = fc->scramble_key; |
298 | u64 v = (unsigned long) id; | |
299 | u32 v0 = v; | |
300 | u32 v1 = v >> 32; | |
301 | u32 sum = 0; | |
302 | int i; | |
303 | ||
304 | for (i = 0; i < 32; i++) { | |
305 | v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]); | |
306 | sum += 0x9E3779B9; | |
307 | v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]); | |
308 | } | |
309 | ||
310 | return (u64) v0 + ((u64) v1 << 32); | |
71421259 MS |
311 | } |
312 | ||
3be5a52b MS |
313 | /* |
314 | * Check if page is under writeback | |
315 | * | |
316 | * This is currently done by walking the list of writepage requests | |
317 | * for the inode, which can be pretty inefficient. | |
318 | */ | |
319 | static bool fuse_page_is_writeback(struct inode *inode, pgoff_t index) | |
320 | { | |
321 | struct fuse_conn *fc = get_fuse_conn(inode); | |
322 | struct fuse_inode *fi = get_fuse_inode(inode); | |
323 | struct fuse_req *req; | |
324 | bool found = false; | |
325 | ||
326 | spin_lock(&fc->lock); | |
327 | list_for_each_entry(req, &fi->writepages, writepages_entry) { | |
328 | pgoff_t curr_index; | |
329 | ||
330 | BUG_ON(req->inode != inode); | |
331 | curr_index = req->misc.write.in.offset >> PAGE_CACHE_SHIFT; | |
332 | if (curr_index == index) { | |
333 | found = true; | |
334 | break; | |
335 | } | |
336 | } | |
337 | spin_unlock(&fc->lock); | |
338 | ||
339 | return found; | |
340 | } | |
341 | ||
342 | /* | |
343 | * Wait for page writeback to be completed. | |
344 | * | |
345 | * Since fuse doesn't rely on the VM writeback tracking, this has to | |
346 | * use some other means. | |
347 | */ | |
348 | static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index) | |
349 | { | |
350 | struct fuse_inode *fi = get_fuse_inode(inode); | |
351 | ||
352 | wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index)); | |
353 | return 0; | |
354 | } | |
355 | ||
75e1fcc0 | 356 | static int fuse_flush(struct file *file, fl_owner_t id) |
b6aeaded | 357 | { |
7706a9d6 | 358 | struct inode *inode = file->f_path.dentry->d_inode; |
b6aeaded MS |
359 | struct fuse_conn *fc = get_fuse_conn(inode); |
360 | struct fuse_file *ff = file->private_data; | |
361 | struct fuse_req *req; | |
362 | struct fuse_flush_in inarg; | |
363 | int err; | |
364 | ||
248d86e8 MS |
365 | if (is_bad_inode(inode)) |
366 | return -EIO; | |
367 | ||
b6aeaded MS |
368 | if (fc->no_flush) |
369 | return 0; | |
370 | ||
b111c8c0 | 371 | req = fuse_get_req_nofail_nopages(fc, file); |
b6aeaded MS |
372 | memset(&inarg, 0, sizeof(inarg)); |
373 | inarg.fh = ff->fh; | |
9c8ef561 | 374 | inarg.lock_owner = fuse_lock_owner_id(fc, id); |
b6aeaded MS |
375 | req->in.h.opcode = FUSE_FLUSH; |
376 | req->in.h.nodeid = get_node_id(inode); | |
b6aeaded MS |
377 | req->in.numargs = 1; |
378 | req->in.args[0].size = sizeof(inarg); | |
379 | req->in.args[0].value = &inarg; | |
71421259 | 380 | req->force = 1; |
b93f858a | 381 | fuse_request_send(fc, req); |
b6aeaded MS |
382 | err = req->out.h.error; |
383 | fuse_put_request(fc, req); | |
384 | if (err == -ENOSYS) { | |
385 | fc->no_flush = 1; | |
386 | err = 0; | |
387 | } | |
388 | return err; | |
389 | } | |
390 | ||
3be5a52b MS |
391 | /* |
392 | * Wait for all pending writepages on the inode to finish. | |
393 | * | |
394 | * This is currently done by blocking further writes with FUSE_NOWRITE | |
395 | * and waiting for all sent writes to complete. | |
396 | * | |
397 | * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage | |
398 | * could conflict with truncation. | |
399 | */ | |
400 | static void fuse_sync_writes(struct inode *inode) | |
401 | { | |
402 | fuse_set_nowrite(inode); | |
403 | fuse_release_nowrite(inode); | |
404 | } | |
405 | ||
02c24a82 JB |
406 | int fuse_fsync_common(struct file *file, loff_t start, loff_t end, |
407 | int datasync, int isdir) | |
b6aeaded | 408 | { |
7ea80859 | 409 | struct inode *inode = file->f_mapping->host; |
b6aeaded MS |
410 | struct fuse_conn *fc = get_fuse_conn(inode); |
411 | struct fuse_file *ff = file->private_data; | |
412 | struct fuse_req *req; | |
413 | struct fuse_fsync_in inarg; | |
414 | int err; | |
415 | ||
248d86e8 MS |
416 | if (is_bad_inode(inode)) |
417 | return -EIO; | |
418 | ||
02c24a82 JB |
419 | err = filemap_write_and_wait_range(inode->i_mapping, start, end); |
420 | if (err) | |
421 | return err; | |
422 | ||
82547981 | 423 | if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir)) |
b6aeaded MS |
424 | return 0; |
425 | ||
02c24a82 JB |
426 | mutex_lock(&inode->i_mutex); |
427 | ||
3be5a52b MS |
428 | /* |
429 | * Start writeback against all dirty pages of the inode, then | |
430 | * wait for all outstanding writes, before sending the FSYNC | |
431 | * request. | |
432 | */ | |
433 | err = write_inode_now(inode, 0); | |
434 | if (err) | |
02c24a82 | 435 | goto out; |
3be5a52b MS |
436 | |
437 | fuse_sync_writes(inode); | |
438 | ||
b111c8c0 | 439 | req = fuse_get_req_nopages(fc); |
02c24a82 JB |
440 | if (IS_ERR(req)) { |
441 | err = PTR_ERR(req); | |
442 | goto out; | |
443 | } | |
b6aeaded MS |
444 | |
445 | memset(&inarg, 0, sizeof(inarg)); | |
446 | inarg.fh = ff->fh; | |
447 | inarg.fsync_flags = datasync ? 1 : 0; | |
82547981 | 448 | req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC; |
b6aeaded | 449 | req->in.h.nodeid = get_node_id(inode); |
b6aeaded MS |
450 | req->in.numargs = 1; |
451 | req->in.args[0].size = sizeof(inarg); | |
452 | req->in.args[0].value = &inarg; | |
b93f858a | 453 | fuse_request_send(fc, req); |
b6aeaded MS |
454 | err = req->out.h.error; |
455 | fuse_put_request(fc, req); | |
456 | if (err == -ENOSYS) { | |
82547981 MS |
457 | if (isdir) |
458 | fc->no_fsyncdir = 1; | |
459 | else | |
460 | fc->no_fsync = 1; | |
b6aeaded MS |
461 | err = 0; |
462 | } | |
02c24a82 JB |
463 | out: |
464 | mutex_unlock(&inode->i_mutex); | |
b6aeaded MS |
465 | return err; |
466 | } | |
467 | ||
02c24a82 JB |
468 | static int fuse_fsync(struct file *file, loff_t start, loff_t end, |
469 | int datasync) | |
82547981 | 470 | { |
02c24a82 | 471 | return fuse_fsync_common(file, start, end, datasync, 0); |
82547981 MS |
472 | } |
473 | ||
2106cb18 MS |
474 | void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos, |
475 | size_t count, int opcode) | |
b6aeaded | 476 | { |
5c5c5e51 | 477 | struct fuse_read_in *inarg = &req->misc.read.in; |
a6643094 | 478 | struct fuse_file *ff = file->private_data; |
b6aeaded | 479 | |
361b1eb5 MS |
480 | inarg->fh = ff->fh; |
481 | inarg->offset = pos; | |
482 | inarg->size = count; | |
a6643094 | 483 | inarg->flags = file->f_flags; |
361b1eb5 | 484 | req->in.h.opcode = opcode; |
2106cb18 | 485 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
486 | req->in.numargs = 1; |
487 | req->in.args[0].size = sizeof(struct fuse_read_in); | |
c1aa96a5 | 488 | req->in.args[0].value = inarg; |
b6aeaded MS |
489 | req->out.argvar = 1; |
490 | req->out.numargs = 1; | |
491 | req->out.args[0].size = count; | |
b6aeaded MS |
492 | } |
493 | ||
8bfc016d | 494 | static size_t fuse_send_read(struct fuse_req *req, struct file *file, |
2106cb18 | 495 | loff_t pos, size_t count, fl_owner_t owner) |
04730fef | 496 | { |
2106cb18 MS |
497 | struct fuse_file *ff = file->private_data; |
498 | struct fuse_conn *fc = ff->fc; | |
f3332114 | 499 | |
2106cb18 | 500 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
f3332114 | 501 | if (owner != NULL) { |
5c5c5e51 | 502 | struct fuse_read_in *inarg = &req->misc.read.in; |
f3332114 MS |
503 | |
504 | inarg->read_flags |= FUSE_READ_LOCKOWNER; | |
505 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
506 | } | |
b93f858a | 507 | fuse_request_send(fc, req); |
361b1eb5 | 508 | return req->out.args[0].size; |
04730fef MS |
509 | } |
510 | ||
5c5c5e51 MS |
511 | static void fuse_read_update_size(struct inode *inode, loff_t size, |
512 | u64 attr_ver) | |
513 | { | |
514 | struct fuse_conn *fc = get_fuse_conn(inode); | |
515 | struct fuse_inode *fi = get_fuse_inode(inode); | |
516 | ||
517 | spin_lock(&fc->lock); | |
518 | if (attr_ver == fi->attr_version && size < inode->i_size) { | |
519 | fi->attr_version = ++fc->attr_version; | |
520 | i_size_write(inode, size); | |
521 | } | |
522 | spin_unlock(&fc->lock); | |
523 | } | |
524 | ||
b6aeaded MS |
525 | static int fuse_readpage(struct file *file, struct page *page) |
526 | { | |
527 | struct inode *inode = page->mapping->host; | |
528 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 | 529 | struct fuse_req *req; |
5c5c5e51 MS |
530 | size_t num_read; |
531 | loff_t pos = page_offset(page); | |
532 | size_t count = PAGE_CACHE_SIZE; | |
533 | u64 attr_ver; | |
248d86e8 MS |
534 | int err; |
535 | ||
536 | err = -EIO; | |
537 | if (is_bad_inode(inode)) | |
538 | goto out; | |
539 | ||
3be5a52b | 540 | /* |
25985edc | 541 | * Page writeback can extend beyond the lifetime of the |
3be5a52b MS |
542 | * page-cache page, so make sure we read a properly synced |
543 | * page. | |
544 | */ | |
545 | fuse_wait_on_page_writeback(inode, page->index); | |
546 | ||
b111c8c0 | 547 | req = fuse_get_req(fc, 1); |
ce1d5a49 MS |
548 | err = PTR_ERR(req); |
549 | if (IS_ERR(req)) | |
b6aeaded MS |
550 | goto out; |
551 | ||
5c5c5e51 MS |
552 | attr_ver = fuse_get_attr_version(fc); |
553 | ||
b6aeaded | 554 | req->out.page_zeroing = 1; |
f4975c67 | 555 | req->out.argpages = 1; |
b6aeaded MS |
556 | req->num_pages = 1; |
557 | req->pages[0] = page; | |
85f40aec | 558 | req->page_descs[0].length = count; |
2106cb18 | 559 | num_read = fuse_send_read(req, file, pos, count, NULL); |
b6aeaded MS |
560 | err = req->out.h.error; |
561 | fuse_put_request(fc, req); | |
5c5c5e51 MS |
562 | |
563 | if (!err) { | |
564 | /* | |
565 | * Short read means EOF. If file size is larger, truncate it | |
566 | */ | |
567 | if (num_read < count) | |
568 | fuse_read_update_size(inode, pos + num_read, attr_ver); | |
569 | ||
b6aeaded | 570 | SetPageUptodate(page); |
5c5c5e51 MS |
571 | } |
572 | ||
b36c31ba | 573 | fuse_invalidate_attr(inode); /* atime changed */ |
b6aeaded MS |
574 | out: |
575 | unlock_page(page); | |
576 | return err; | |
577 | } | |
578 | ||
c1aa96a5 | 579 | static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req) |
db50b96c | 580 | { |
c1aa96a5 | 581 | int i; |
5c5c5e51 MS |
582 | size_t count = req->misc.read.in.size; |
583 | size_t num_read = req->out.args[0].size; | |
ce534fb0 | 584 | struct address_space *mapping = NULL; |
c1aa96a5 | 585 | |
ce534fb0 MS |
586 | for (i = 0; mapping == NULL && i < req->num_pages; i++) |
587 | mapping = req->pages[i]->mapping; | |
5c5c5e51 | 588 | |
ce534fb0 MS |
589 | if (mapping) { |
590 | struct inode *inode = mapping->host; | |
591 | ||
592 | /* | |
593 | * Short read means EOF. If file size is larger, truncate it | |
594 | */ | |
595 | if (!req->out.h.error && num_read < count) { | |
596 | loff_t pos; | |
597 | ||
598 | pos = page_offset(req->pages[0]) + num_read; | |
599 | fuse_read_update_size(inode, pos, | |
600 | req->misc.read.attr_ver); | |
601 | } | |
602 | fuse_invalidate_attr(inode); /* atime changed */ | |
603 | } | |
c1aa96a5 | 604 | |
db50b96c MS |
605 | for (i = 0; i < req->num_pages; i++) { |
606 | struct page *page = req->pages[i]; | |
607 | if (!req->out.h.error) | |
608 | SetPageUptodate(page); | |
c1aa96a5 MS |
609 | else |
610 | SetPageError(page); | |
db50b96c | 611 | unlock_page(page); |
b5dd3285 | 612 | page_cache_release(page); |
db50b96c | 613 | } |
c756e0a4 | 614 | if (req->ff) |
5a18ec17 | 615 | fuse_file_put(req->ff, false); |
c1aa96a5 MS |
616 | } |
617 | ||
2106cb18 | 618 | static void fuse_send_readpages(struct fuse_req *req, struct file *file) |
c1aa96a5 | 619 | { |
2106cb18 MS |
620 | struct fuse_file *ff = file->private_data; |
621 | struct fuse_conn *fc = ff->fc; | |
c1aa96a5 MS |
622 | loff_t pos = page_offset(req->pages[0]); |
623 | size_t count = req->num_pages << PAGE_CACHE_SHIFT; | |
f4975c67 MS |
624 | |
625 | req->out.argpages = 1; | |
c1aa96a5 | 626 | req->out.page_zeroing = 1; |
ce534fb0 | 627 | req->out.page_replace = 1; |
2106cb18 | 628 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
5c5c5e51 | 629 | req->misc.read.attr_ver = fuse_get_attr_version(fc); |
9cd68455 | 630 | if (fc->async_read) { |
c756e0a4 | 631 | req->ff = fuse_file_get(ff); |
9cd68455 | 632 | req->end = fuse_readpages_end; |
b93f858a | 633 | fuse_request_send_background(fc, req); |
9cd68455 | 634 | } else { |
b93f858a | 635 | fuse_request_send(fc, req); |
9cd68455 | 636 | fuse_readpages_end(fc, req); |
e9bb09dd | 637 | fuse_put_request(fc, req); |
9cd68455 | 638 | } |
db50b96c MS |
639 | } |
640 | ||
c756e0a4 | 641 | struct fuse_fill_data { |
db50b96c | 642 | struct fuse_req *req; |
a6643094 | 643 | struct file *file; |
db50b96c | 644 | struct inode *inode; |
f8dbdf81 | 645 | unsigned nr_pages; |
db50b96c MS |
646 | }; |
647 | ||
648 | static int fuse_readpages_fill(void *_data, struct page *page) | |
649 | { | |
c756e0a4 | 650 | struct fuse_fill_data *data = _data; |
db50b96c MS |
651 | struct fuse_req *req = data->req; |
652 | struct inode *inode = data->inode; | |
653 | struct fuse_conn *fc = get_fuse_conn(inode); | |
654 | ||
3be5a52b MS |
655 | fuse_wait_on_page_writeback(inode, page->index); |
656 | ||
db50b96c MS |
657 | if (req->num_pages && |
658 | (req->num_pages == FUSE_MAX_PAGES_PER_REQ || | |
659 | (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read || | |
660 | req->pages[req->num_pages - 1]->index + 1 != page->index)) { | |
f8dbdf81 MP |
661 | int nr_alloc = min_t(unsigned, data->nr_pages, |
662 | FUSE_MAX_PAGES_PER_REQ); | |
2106cb18 | 663 | fuse_send_readpages(req, data->file); |
f8dbdf81 | 664 | data->req = req = fuse_get_req(fc, nr_alloc); |
ce1d5a49 | 665 | if (IS_ERR(req)) { |
db50b96c | 666 | unlock_page(page); |
ce1d5a49 | 667 | return PTR_ERR(req); |
db50b96c | 668 | } |
db50b96c | 669 | } |
f8dbdf81 MP |
670 | |
671 | if (WARN_ON(req->num_pages >= req->max_pages)) { | |
672 | fuse_put_request(fc, req); | |
673 | return -EIO; | |
674 | } | |
675 | ||
b5dd3285 | 676 | page_cache_get(page); |
db50b96c | 677 | req->pages[req->num_pages] = page; |
85f40aec | 678 | req->page_descs[req->num_pages].length = PAGE_SIZE; |
1729a16c | 679 | req->num_pages++; |
f8dbdf81 | 680 | data->nr_pages--; |
db50b96c MS |
681 | return 0; |
682 | } | |
683 | ||
684 | static int fuse_readpages(struct file *file, struct address_space *mapping, | |
685 | struct list_head *pages, unsigned nr_pages) | |
686 | { | |
687 | struct inode *inode = mapping->host; | |
688 | struct fuse_conn *fc = get_fuse_conn(inode); | |
c756e0a4 | 689 | struct fuse_fill_data data; |
db50b96c | 690 | int err; |
f8dbdf81 | 691 | int nr_alloc = min_t(unsigned, nr_pages, FUSE_MAX_PAGES_PER_REQ); |
248d86e8 | 692 | |
1d7ea732 | 693 | err = -EIO; |
248d86e8 | 694 | if (is_bad_inode(inode)) |
2e990021 | 695 | goto out; |
248d86e8 | 696 | |
a6643094 | 697 | data.file = file; |
db50b96c | 698 | data.inode = inode; |
f8dbdf81 MP |
699 | data.req = fuse_get_req(fc, nr_alloc); |
700 | data.nr_pages = nr_pages; | |
1d7ea732 | 701 | err = PTR_ERR(data.req); |
ce1d5a49 | 702 | if (IS_ERR(data.req)) |
2e990021 | 703 | goto out; |
db50b96c MS |
704 | |
705 | err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); | |
d3406ffa MS |
706 | if (!err) { |
707 | if (data.req->num_pages) | |
2106cb18 | 708 | fuse_send_readpages(data.req, file); |
d3406ffa MS |
709 | else |
710 | fuse_put_request(fc, data.req); | |
711 | } | |
2e990021 | 712 | out: |
1d7ea732 | 713 | return err; |
db50b96c MS |
714 | } |
715 | ||
bcb4be80 MS |
716 | static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov, |
717 | unsigned long nr_segs, loff_t pos) | |
718 | { | |
719 | struct inode *inode = iocb->ki_filp->f_mapping->host; | |
a8894274 | 720 | struct fuse_conn *fc = get_fuse_conn(inode); |
bcb4be80 | 721 | |
a8894274 BF |
722 | /* |
723 | * In auto invalidate mode, always update attributes on read. | |
724 | * Otherwise, only update if we attempt to read past EOF (to ensure | |
725 | * i_size is up to date). | |
726 | */ | |
727 | if (fc->auto_inval_data || | |
728 | (pos + iov_length(iov, nr_segs) > i_size_read(inode))) { | |
bcb4be80 | 729 | int err; |
bcb4be80 MS |
730 | err = fuse_update_attributes(inode, NULL, iocb->ki_filp, NULL); |
731 | if (err) | |
732 | return err; | |
733 | } | |
734 | ||
735 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
736 | } | |
737 | ||
2d698b07 | 738 | static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff, |
2106cb18 | 739 | loff_t pos, size_t count) |
b6aeaded | 740 | { |
b25e82e5 MS |
741 | struct fuse_write_in *inarg = &req->misc.write.in; |
742 | struct fuse_write_out *outarg = &req->misc.write.out; | |
b6aeaded | 743 | |
b25e82e5 MS |
744 | inarg->fh = ff->fh; |
745 | inarg->offset = pos; | |
746 | inarg->size = count; | |
b6aeaded | 747 | req->in.h.opcode = FUSE_WRITE; |
2106cb18 | 748 | req->in.h.nodeid = ff->nodeid; |
b6aeaded | 749 | req->in.numargs = 2; |
2106cb18 | 750 | if (ff->fc->minor < 9) |
f3332114 MS |
751 | req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE; |
752 | else | |
753 | req->in.args[0].size = sizeof(struct fuse_write_in); | |
b25e82e5 | 754 | req->in.args[0].value = inarg; |
b6aeaded MS |
755 | req->in.args[1].size = count; |
756 | req->out.numargs = 1; | |
757 | req->out.args[0].size = sizeof(struct fuse_write_out); | |
b25e82e5 MS |
758 | req->out.args[0].value = outarg; |
759 | } | |
760 | ||
761 | static size_t fuse_send_write(struct fuse_req *req, struct file *file, | |
2106cb18 | 762 | loff_t pos, size_t count, fl_owner_t owner) |
b25e82e5 | 763 | { |
2106cb18 MS |
764 | struct fuse_file *ff = file->private_data; |
765 | struct fuse_conn *fc = ff->fc; | |
2d698b07 MS |
766 | struct fuse_write_in *inarg = &req->misc.write.in; |
767 | ||
2106cb18 | 768 | fuse_write_fill(req, ff, pos, count); |
2d698b07 | 769 | inarg->flags = file->f_flags; |
f3332114 | 770 | if (owner != NULL) { |
f3332114 MS |
771 | inarg->write_flags |= FUSE_WRITE_LOCKOWNER; |
772 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
773 | } | |
b93f858a | 774 | fuse_request_send(fc, req); |
b25e82e5 | 775 | return req->misc.write.out.size; |
b6aeaded MS |
776 | } |
777 | ||
a1d75f25 | 778 | void fuse_write_update_size(struct inode *inode, loff_t pos) |
854512ec MS |
779 | { |
780 | struct fuse_conn *fc = get_fuse_conn(inode); | |
781 | struct fuse_inode *fi = get_fuse_inode(inode); | |
782 | ||
783 | spin_lock(&fc->lock); | |
784 | fi->attr_version = ++fc->attr_version; | |
785 | if (pos > inode->i_size) | |
786 | i_size_write(inode, pos); | |
787 | spin_unlock(&fc->lock); | |
788 | } | |
789 | ||
ea9b9907 NP |
790 | static size_t fuse_send_write_pages(struct fuse_req *req, struct file *file, |
791 | struct inode *inode, loff_t pos, | |
792 | size_t count) | |
793 | { | |
794 | size_t res; | |
795 | unsigned offset; | |
796 | unsigned i; | |
797 | ||
798 | for (i = 0; i < req->num_pages; i++) | |
799 | fuse_wait_on_page_writeback(inode, req->pages[i]->index); | |
800 | ||
2106cb18 | 801 | res = fuse_send_write(req, file, pos, count, NULL); |
ea9b9907 | 802 | |
b2430d75 | 803 | offset = req->page_descs[0].offset; |
ea9b9907 NP |
804 | count = res; |
805 | for (i = 0; i < req->num_pages; i++) { | |
806 | struct page *page = req->pages[i]; | |
807 | ||
808 | if (!req->out.h.error && !offset && count >= PAGE_CACHE_SIZE) | |
809 | SetPageUptodate(page); | |
810 | ||
811 | if (count > PAGE_CACHE_SIZE - offset) | |
812 | count -= PAGE_CACHE_SIZE - offset; | |
813 | else | |
814 | count = 0; | |
815 | offset = 0; | |
816 | ||
817 | unlock_page(page); | |
818 | page_cache_release(page); | |
819 | } | |
820 | ||
821 | return res; | |
822 | } | |
823 | ||
824 | static ssize_t fuse_fill_write_pages(struct fuse_req *req, | |
825 | struct address_space *mapping, | |
826 | struct iov_iter *ii, loff_t pos) | |
827 | { | |
828 | struct fuse_conn *fc = get_fuse_conn(mapping->host); | |
829 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
830 | size_t count = 0; | |
831 | int err; | |
832 | ||
f4975c67 | 833 | req->in.argpages = 1; |
b2430d75 | 834 | req->page_descs[0].offset = offset; |
ea9b9907 NP |
835 | |
836 | do { | |
837 | size_t tmp; | |
838 | struct page *page; | |
839 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; | |
840 | size_t bytes = min_t(size_t, PAGE_CACHE_SIZE - offset, | |
841 | iov_iter_count(ii)); | |
842 | ||
843 | bytes = min_t(size_t, bytes, fc->max_write - count); | |
844 | ||
845 | again: | |
846 | err = -EFAULT; | |
847 | if (iov_iter_fault_in_readable(ii, bytes)) | |
848 | break; | |
849 | ||
850 | err = -ENOMEM; | |
54566b2c | 851 | page = grab_cache_page_write_begin(mapping, index, 0); |
ea9b9907 NP |
852 | if (!page) |
853 | break; | |
854 | ||
931e80e4 | 855 | if (mapping_writably_mapped(mapping)) |
856 | flush_dcache_page(page); | |
857 | ||
ea9b9907 NP |
858 | pagefault_disable(); |
859 | tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes); | |
860 | pagefault_enable(); | |
861 | flush_dcache_page(page); | |
862 | ||
478e0841 JW |
863 | mark_page_accessed(page); |
864 | ||
ea9b9907 NP |
865 | if (!tmp) { |
866 | unlock_page(page); | |
867 | page_cache_release(page); | |
868 | bytes = min(bytes, iov_iter_single_seg_count(ii)); | |
869 | goto again; | |
870 | } | |
871 | ||
872 | err = 0; | |
873 | req->pages[req->num_pages] = page; | |
85f40aec | 874 | req->page_descs[req->num_pages].length = tmp; |
ea9b9907 NP |
875 | req->num_pages++; |
876 | ||
877 | iov_iter_advance(ii, tmp); | |
878 | count += tmp; | |
879 | pos += tmp; | |
880 | offset += tmp; | |
881 | if (offset == PAGE_CACHE_SIZE) | |
882 | offset = 0; | |
883 | ||
78bb6cb9 MS |
884 | if (!fc->big_writes) |
885 | break; | |
ea9b9907 | 886 | } while (iov_iter_count(ii) && count < fc->max_write && |
d07f09f5 | 887 | req->num_pages < req->max_pages && offset == 0); |
ea9b9907 NP |
888 | |
889 | return count > 0 ? count : err; | |
890 | } | |
891 | ||
d07f09f5 MP |
892 | static inline unsigned fuse_wr_pages(loff_t pos, size_t len) |
893 | { | |
894 | return min_t(unsigned, | |
895 | ((pos + len - 1) >> PAGE_CACHE_SHIFT) - | |
896 | (pos >> PAGE_CACHE_SHIFT) + 1, | |
897 | FUSE_MAX_PAGES_PER_REQ); | |
898 | } | |
899 | ||
ea9b9907 NP |
900 | static ssize_t fuse_perform_write(struct file *file, |
901 | struct address_space *mapping, | |
902 | struct iov_iter *ii, loff_t pos) | |
903 | { | |
904 | struct inode *inode = mapping->host; | |
905 | struct fuse_conn *fc = get_fuse_conn(inode); | |
906 | int err = 0; | |
907 | ssize_t res = 0; | |
908 | ||
909 | if (is_bad_inode(inode)) | |
910 | return -EIO; | |
911 | ||
912 | do { | |
913 | struct fuse_req *req; | |
914 | ssize_t count; | |
d07f09f5 | 915 | unsigned nr_pages = fuse_wr_pages(pos, iov_iter_count(ii)); |
ea9b9907 | 916 | |
d07f09f5 | 917 | req = fuse_get_req(fc, nr_pages); |
ea9b9907 NP |
918 | if (IS_ERR(req)) { |
919 | err = PTR_ERR(req); | |
920 | break; | |
921 | } | |
922 | ||
923 | count = fuse_fill_write_pages(req, mapping, ii, pos); | |
924 | if (count <= 0) { | |
925 | err = count; | |
926 | } else { | |
927 | size_t num_written; | |
928 | ||
929 | num_written = fuse_send_write_pages(req, file, inode, | |
930 | pos, count); | |
931 | err = req->out.h.error; | |
932 | if (!err) { | |
933 | res += num_written; | |
934 | pos += num_written; | |
935 | ||
936 | /* break out of the loop on short write */ | |
937 | if (num_written != count) | |
938 | err = -EIO; | |
939 | } | |
940 | } | |
941 | fuse_put_request(fc, req); | |
942 | } while (!err && iov_iter_count(ii)); | |
943 | ||
944 | if (res > 0) | |
945 | fuse_write_update_size(inode, pos); | |
946 | ||
947 | fuse_invalidate_attr(inode); | |
948 | ||
949 | return res > 0 ? res : err; | |
950 | } | |
951 | ||
952 | static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov, | |
953 | unsigned long nr_segs, loff_t pos) | |
954 | { | |
955 | struct file *file = iocb->ki_filp; | |
956 | struct address_space *mapping = file->f_mapping; | |
957 | size_t count = 0; | |
4273b793 | 958 | size_t ocount = 0; |
ea9b9907 | 959 | ssize_t written = 0; |
4273b793 | 960 | ssize_t written_buffered = 0; |
ea9b9907 NP |
961 | struct inode *inode = mapping->host; |
962 | ssize_t err; | |
963 | struct iov_iter i; | |
4273b793 | 964 | loff_t endbyte = 0; |
ea9b9907 NP |
965 | |
966 | WARN_ON(iocb->ki_pos != pos); | |
967 | ||
4273b793 AA |
968 | ocount = 0; |
969 | err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ); | |
ea9b9907 NP |
970 | if (err) |
971 | return err; | |
972 | ||
4273b793 | 973 | count = ocount; |
58ef6a75 | 974 | sb_start_write(inode->i_sb); |
ea9b9907 | 975 | mutex_lock(&inode->i_mutex); |
ea9b9907 NP |
976 | |
977 | /* We can write back this queue in page reclaim */ | |
978 | current->backing_dev_info = mapping->backing_dev_info; | |
979 | ||
980 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
981 | if (err) | |
982 | goto out; | |
983 | ||
984 | if (count == 0) | |
985 | goto out; | |
986 | ||
2f1936b8 | 987 | err = file_remove_suid(file); |
ea9b9907 NP |
988 | if (err) |
989 | goto out; | |
990 | ||
c3b2da31 JB |
991 | err = file_update_time(file); |
992 | if (err) | |
993 | goto out; | |
ea9b9907 | 994 | |
4273b793 AA |
995 | if (file->f_flags & O_DIRECT) { |
996 | written = generic_file_direct_write(iocb, iov, &nr_segs, | |
997 | pos, &iocb->ki_pos, | |
998 | count, ocount); | |
999 | if (written < 0 || written == count) | |
1000 | goto out; | |
1001 | ||
1002 | pos += written; | |
1003 | count -= written; | |
ea9b9907 | 1004 | |
4273b793 AA |
1005 | iov_iter_init(&i, iov, nr_segs, count, written); |
1006 | written_buffered = fuse_perform_write(file, mapping, &i, pos); | |
1007 | if (written_buffered < 0) { | |
1008 | err = written_buffered; | |
1009 | goto out; | |
1010 | } | |
1011 | endbyte = pos + written_buffered - 1; | |
1012 | ||
1013 | err = filemap_write_and_wait_range(file->f_mapping, pos, | |
1014 | endbyte); | |
1015 | if (err) | |
1016 | goto out; | |
1017 | ||
1018 | invalidate_mapping_pages(file->f_mapping, | |
1019 | pos >> PAGE_CACHE_SHIFT, | |
1020 | endbyte >> PAGE_CACHE_SHIFT); | |
1021 | ||
1022 | written += written_buffered; | |
1023 | iocb->ki_pos = pos + written_buffered; | |
1024 | } else { | |
1025 | iov_iter_init(&i, iov, nr_segs, count, 0); | |
1026 | written = fuse_perform_write(file, mapping, &i, pos); | |
1027 | if (written >= 0) | |
1028 | iocb->ki_pos = pos + written; | |
1029 | } | |
ea9b9907 NP |
1030 | out: |
1031 | current->backing_dev_info = NULL; | |
1032 | mutex_unlock(&inode->i_mutex); | |
58ef6a75 | 1033 | sb_end_write(inode->i_sb); |
ea9b9907 NP |
1034 | |
1035 | return written ? written : err; | |
1036 | } | |
1037 | ||
413ef8cb MS |
1038 | static void fuse_release_user_pages(struct fuse_req *req, int write) |
1039 | { | |
1040 | unsigned i; | |
1041 | ||
1042 | for (i = 0; i < req->num_pages; i++) { | |
1043 | struct page *page = req->pages[i]; | |
1044 | if (write) | |
1045 | set_page_dirty_lock(page); | |
1046 | put_page(page); | |
1047 | } | |
1048 | } | |
1049 | ||
85f40aec MP |
1050 | static inline void fuse_page_descs_length_init(struct fuse_req *req) |
1051 | { | |
1052 | int i; | |
1053 | ||
1054 | for (i = 0; i < req->num_pages; i++) | |
1055 | req->page_descs[i].length = PAGE_SIZE - | |
1056 | req->page_descs[i].offset; | |
1057 | } | |
1058 | ||
413ef8cb | 1059 | static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf, |
ce60a2f1 | 1060 | size_t *nbytesp, int write) |
413ef8cb | 1061 | { |
ce60a2f1 | 1062 | size_t nbytes = *nbytesp; |
413ef8cb MS |
1063 | unsigned long user_addr = (unsigned long) buf; |
1064 | unsigned offset = user_addr & ~PAGE_MASK; | |
1065 | int npages; | |
1066 | ||
f4975c67 MS |
1067 | /* Special case for kernel I/O: can copy directly into the buffer */ |
1068 | if (segment_eq(get_fs(), KERNEL_DS)) { | |
1069 | if (write) | |
1070 | req->in.args[1].value = (void *) user_addr; | |
1071 | else | |
1072 | req->out.args[0].value = (void *) user_addr; | |
1073 | ||
1074 | return 0; | |
1075 | } | |
413ef8cb | 1076 | |
ce60a2f1 | 1077 | nbytes = min_t(size_t, nbytes, FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT); |
413ef8cb | 1078 | npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT; |
bd730967 | 1079 | npages = clamp(npages, 1, FUSE_MAX_PAGES_PER_REQ); |
1bf94ca7 | 1080 | npages = get_user_pages_fast(user_addr, npages, !write, req->pages); |
413ef8cb MS |
1081 | if (npages < 0) |
1082 | return npages; | |
1083 | ||
1084 | req->num_pages = npages; | |
b2430d75 | 1085 | req->page_descs[0].offset = offset; |
85f40aec | 1086 | fuse_page_descs_length_init(req); |
f4975c67 MS |
1087 | |
1088 | if (write) | |
1089 | req->in.argpages = 1; | |
1090 | else | |
1091 | req->out.argpages = 1; | |
1092 | ||
b2430d75 | 1093 | nbytes = (req->num_pages << PAGE_SHIFT) - req->page_descs[0].offset; |
85f40aec MP |
1094 | |
1095 | if (*nbytesp < nbytes) | |
1096 | req->page_descs[req->num_pages - 1].length -= | |
1097 | nbytes - *nbytesp; | |
1098 | ||
f4975c67 MS |
1099 | *nbytesp = min(*nbytesp, nbytes); |
1100 | ||
413ef8cb MS |
1101 | return 0; |
1102 | } | |
1103 | ||
08cbf542 TH |
1104 | ssize_t fuse_direct_io(struct file *file, const char __user *buf, |
1105 | size_t count, loff_t *ppos, int write) | |
413ef8cb | 1106 | { |
2106cb18 MS |
1107 | struct fuse_file *ff = file->private_data; |
1108 | struct fuse_conn *fc = ff->fc; | |
413ef8cb MS |
1109 | size_t nmax = write ? fc->max_write : fc->max_read; |
1110 | loff_t pos = *ppos; | |
1111 | ssize_t res = 0; | |
248d86e8 MS |
1112 | struct fuse_req *req; |
1113 | ||
b111c8c0 | 1114 | req = fuse_get_req(fc, FUSE_MAX_PAGES_PER_REQ); |
ce1d5a49 MS |
1115 | if (IS_ERR(req)) |
1116 | return PTR_ERR(req); | |
413ef8cb MS |
1117 | |
1118 | while (count) { | |
413ef8cb | 1119 | size_t nres; |
2106cb18 | 1120 | fl_owner_t owner = current->files; |
f4975c67 MS |
1121 | size_t nbytes = min(count, nmax); |
1122 | int err = fuse_get_user_pages(req, buf, &nbytes, write); | |
413ef8cb MS |
1123 | if (err) { |
1124 | res = err; | |
1125 | break; | |
1126 | } | |
f4975c67 | 1127 | |
413ef8cb | 1128 | if (write) |
2106cb18 | 1129 | nres = fuse_send_write(req, file, pos, nbytes, owner); |
413ef8cb | 1130 | else |
2106cb18 MS |
1131 | nres = fuse_send_read(req, file, pos, nbytes, owner); |
1132 | ||
413ef8cb MS |
1133 | fuse_release_user_pages(req, !write); |
1134 | if (req->out.h.error) { | |
1135 | if (!res) | |
1136 | res = req->out.h.error; | |
1137 | break; | |
1138 | } else if (nres > nbytes) { | |
1139 | res = -EIO; | |
1140 | break; | |
1141 | } | |
1142 | count -= nres; | |
1143 | res += nres; | |
1144 | pos += nres; | |
1145 | buf += nres; | |
1146 | if (nres != nbytes) | |
1147 | break; | |
56cf34ff MS |
1148 | if (count) { |
1149 | fuse_put_request(fc, req); | |
b111c8c0 | 1150 | req = fuse_get_req(fc, FUSE_MAX_PAGES_PER_REQ); |
56cf34ff MS |
1151 | if (IS_ERR(req)) |
1152 | break; | |
1153 | } | |
413ef8cb | 1154 | } |
f60311d5 AA |
1155 | if (!IS_ERR(req)) |
1156 | fuse_put_request(fc, req); | |
d09cb9d7 | 1157 | if (res > 0) |
413ef8cb | 1158 | *ppos = pos; |
413ef8cb MS |
1159 | |
1160 | return res; | |
1161 | } | |
08cbf542 | 1162 | EXPORT_SYMBOL_GPL(fuse_direct_io); |
413ef8cb MS |
1163 | |
1164 | static ssize_t fuse_direct_read(struct file *file, char __user *buf, | |
1165 | size_t count, loff_t *ppos) | |
1166 | { | |
d09cb9d7 MS |
1167 | ssize_t res; |
1168 | struct inode *inode = file->f_path.dentry->d_inode; | |
1169 | ||
1170 | if (is_bad_inode(inode)) | |
1171 | return -EIO; | |
1172 | ||
1173 | res = fuse_direct_io(file, buf, count, ppos, 0); | |
1174 | ||
1175 | fuse_invalidate_attr(inode); | |
1176 | ||
1177 | return res; | |
413ef8cb MS |
1178 | } |
1179 | ||
4273b793 AA |
1180 | static ssize_t __fuse_direct_write(struct file *file, const char __user *buf, |
1181 | size_t count, loff_t *ppos) | |
413ef8cb | 1182 | { |
7706a9d6 | 1183 | struct inode *inode = file->f_path.dentry->d_inode; |
413ef8cb | 1184 | ssize_t res; |
d09cb9d7 | 1185 | |
889f7848 | 1186 | res = generic_write_checks(file, ppos, &count, 0); |
d09cb9d7 | 1187 | if (!res) { |
889f7848 | 1188 | res = fuse_direct_io(file, buf, count, ppos, 1); |
d09cb9d7 MS |
1189 | if (res > 0) |
1190 | fuse_write_update_size(inode, *ppos); | |
1191 | } | |
d09cb9d7 MS |
1192 | |
1193 | fuse_invalidate_attr(inode); | |
1194 | ||
413ef8cb MS |
1195 | return res; |
1196 | } | |
1197 | ||
4273b793 AA |
1198 | static ssize_t fuse_direct_write(struct file *file, const char __user *buf, |
1199 | size_t count, loff_t *ppos) | |
1200 | { | |
1201 | struct inode *inode = file->f_path.dentry->d_inode; | |
1202 | ssize_t res; | |
1203 | ||
1204 | if (is_bad_inode(inode)) | |
1205 | return -EIO; | |
1206 | ||
1207 | /* Don't allow parallel writes to the same file */ | |
1208 | mutex_lock(&inode->i_mutex); | |
1209 | res = __fuse_direct_write(file, buf, count, ppos); | |
1210 | mutex_unlock(&inode->i_mutex); | |
1211 | ||
1212 | return res; | |
1213 | } | |
1214 | ||
3be5a52b | 1215 | static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req) |
b6aeaded | 1216 | { |
3be5a52b | 1217 | __free_page(req->pages[0]); |
5a18ec17 | 1218 | fuse_file_put(req->ff, false); |
3be5a52b MS |
1219 | } |
1220 | ||
1221 | static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req) | |
1222 | { | |
1223 | struct inode *inode = req->inode; | |
1224 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1225 | struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info; | |
1226 | ||
1227 | list_del(&req->writepages_entry); | |
1228 | dec_bdi_stat(bdi, BDI_WRITEBACK); | |
1229 | dec_zone_page_state(req->pages[0], NR_WRITEBACK_TEMP); | |
1230 | bdi_writeout_inc(bdi); | |
1231 | wake_up(&fi->page_waitq); | |
1232 | } | |
1233 | ||
1234 | /* Called under fc->lock, may release and reacquire it */ | |
1235 | static void fuse_send_writepage(struct fuse_conn *fc, struct fuse_req *req) | |
b9ca67b2 MS |
1236 | __releases(fc->lock) |
1237 | __acquires(fc->lock) | |
3be5a52b MS |
1238 | { |
1239 | struct fuse_inode *fi = get_fuse_inode(req->inode); | |
1240 | loff_t size = i_size_read(req->inode); | |
1241 | struct fuse_write_in *inarg = &req->misc.write.in; | |
1242 | ||
1243 | if (!fc->connected) | |
1244 | goto out_free; | |
1245 | ||
1246 | if (inarg->offset + PAGE_CACHE_SIZE <= size) { | |
1247 | inarg->size = PAGE_CACHE_SIZE; | |
1248 | } else if (inarg->offset < size) { | |
1249 | inarg->size = size & (PAGE_CACHE_SIZE - 1); | |
1250 | } else { | |
1251 | /* Got truncated off completely */ | |
1252 | goto out_free; | |
b6aeaded | 1253 | } |
3be5a52b MS |
1254 | |
1255 | req->in.args[1].size = inarg->size; | |
1256 | fi->writectr++; | |
b93f858a | 1257 | fuse_request_send_background_locked(fc, req); |
3be5a52b MS |
1258 | return; |
1259 | ||
1260 | out_free: | |
1261 | fuse_writepage_finish(fc, req); | |
1262 | spin_unlock(&fc->lock); | |
1263 | fuse_writepage_free(fc, req); | |
e9bb09dd | 1264 | fuse_put_request(fc, req); |
3be5a52b | 1265 | spin_lock(&fc->lock); |
b6aeaded MS |
1266 | } |
1267 | ||
3be5a52b MS |
1268 | /* |
1269 | * If fi->writectr is positive (no truncate or fsync going on) send | |
1270 | * all queued writepage requests. | |
1271 | * | |
1272 | * Called with fc->lock | |
1273 | */ | |
1274 | void fuse_flush_writepages(struct inode *inode) | |
b9ca67b2 MS |
1275 | __releases(fc->lock) |
1276 | __acquires(fc->lock) | |
b6aeaded | 1277 | { |
3be5a52b MS |
1278 | struct fuse_conn *fc = get_fuse_conn(inode); |
1279 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1280 | struct fuse_req *req; | |
1281 | ||
1282 | while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) { | |
1283 | req = list_entry(fi->queued_writes.next, struct fuse_req, list); | |
1284 | list_del_init(&req->list); | |
1285 | fuse_send_writepage(fc, req); | |
1286 | } | |
1287 | } | |
1288 | ||
1289 | static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req) | |
1290 | { | |
1291 | struct inode *inode = req->inode; | |
1292 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1293 | ||
1294 | mapping_set_error(inode->i_mapping, req->out.h.error); | |
1295 | spin_lock(&fc->lock); | |
1296 | fi->writectr--; | |
1297 | fuse_writepage_finish(fc, req); | |
1298 | spin_unlock(&fc->lock); | |
1299 | fuse_writepage_free(fc, req); | |
1300 | } | |
1301 | ||
1302 | static int fuse_writepage_locked(struct page *page) | |
1303 | { | |
1304 | struct address_space *mapping = page->mapping; | |
1305 | struct inode *inode = mapping->host; | |
1306 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1307 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1308 | struct fuse_req *req; | |
1309 | struct fuse_file *ff; | |
1310 | struct page *tmp_page; | |
1311 | ||
1312 | set_page_writeback(page); | |
1313 | ||
4250c066 | 1314 | req = fuse_request_alloc_nofs(1); |
3be5a52b MS |
1315 | if (!req) |
1316 | goto err; | |
1317 | ||
1318 | tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
1319 | if (!tmp_page) | |
1320 | goto err_free; | |
1321 | ||
1322 | spin_lock(&fc->lock); | |
1323 | BUG_ON(list_empty(&fi->write_files)); | |
1324 | ff = list_entry(fi->write_files.next, struct fuse_file, write_entry); | |
1325 | req->ff = fuse_file_get(ff); | |
1326 | spin_unlock(&fc->lock); | |
1327 | ||
2106cb18 | 1328 | fuse_write_fill(req, ff, page_offset(page), 0); |
3be5a52b MS |
1329 | |
1330 | copy_highpage(tmp_page, page); | |
2d698b07 | 1331 | req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; |
f4975c67 | 1332 | req->in.argpages = 1; |
3be5a52b MS |
1333 | req->num_pages = 1; |
1334 | req->pages[0] = tmp_page; | |
b2430d75 | 1335 | req->page_descs[0].offset = 0; |
85f40aec | 1336 | req->page_descs[0].length = PAGE_SIZE; |
3be5a52b MS |
1337 | req->end = fuse_writepage_end; |
1338 | req->inode = inode; | |
1339 | ||
1340 | inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK); | |
1341 | inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP); | |
1342 | end_page_writeback(page); | |
1343 | ||
1344 | spin_lock(&fc->lock); | |
1345 | list_add(&req->writepages_entry, &fi->writepages); | |
1346 | list_add_tail(&req->list, &fi->queued_writes); | |
1347 | fuse_flush_writepages(inode); | |
1348 | spin_unlock(&fc->lock); | |
1349 | ||
1350 | return 0; | |
1351 | ||
1352 | err_free: | |
1353 | fuse_request_free(req); | |
1354 | err: | |
1355 | end_page_writeback(page); | |
1356 | return -ENOMEM; | |
1357 | } | |
1358 | ||
1359 | static int fuse_writepage(struct page *page, struct writeback_control *wbc) | |
1360 | { | |
1361 | int err; | |
1362 | ||
1363 | err = fuse_writepage_locked(page); | |
1364 | unlock_page(page); | |
1365 | ||
1366 | return err; | |
1367 | } | |
1368 | ||
1369 | static int fuse_launder_page(struct page *page) | |
1370 | { | |
1371 | int err = 0; | |
1372 | if (clear_page_dirty_for_io(page)) { | |
1373 | struct inode *inode = page->mapping->host; | |
1374 | err = fuse_writepage_locked(page); | |
1375 | if (!err) | |
1376 | fuse_wait_on_page_writeback(inode, page->index); | |
1377 | } | |
1378 | return err; | |
1379 | } | |
1380 | ||
1381 | /* | |
1382 | * Write back dirty pages now, because there may not be any suitable | |
1383 | * open files later | |
1384 | */ | |
1385 | static void fuse_vma_close(struct vm_area_struct *vma) | |
1386 | { | |
1387 | filemap_write_and_wait(vma->vm_file->f_mapping); | |
1388 | } | |
1389 | ||
1390 | /* | |
1391 | * Wait for writeback against this page to complete before allowing it | |
1392 | * to be marked dirty again, and hence written back again, possibly | |
1393 | * before the previous writepage completed. | |
1394 | * | |
1395 | * Block here, instead of in ->writepage(), so that the userspace fs | |
1396 | * can only block processes actually operating on the filesystem. | |
1397 | * | |
1398 | * Otherwise unprivileged userspace fs would be able to block | |
1399 | * unrelated: | |
1400 | * | |
1401 | * - page migration | |
1402 | * - sync(2) | |
1403 | * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER | |
1404 | */ | |
c2ec175c | 1405 | static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
3be5a52b | 1406 | { |
c2ec175c | 1407 | struct page *page = vmf->page; |
3be5a52b MS |
1408 | /* |
1409 | * Don't use page->mapping as it may become NULL from a | |
1410 | * concurrent truncate. | |
1411 | */ | |
1412 | struct inode *inode = vma->vm_file->f_mapping->host; | |
1413 | ||
1414 | fuse_wait_on_page_writeback(inode, page->index); | |
1415 | return 0; | |
1416 | } | |
1417 | ||
f0f37e2f | 1418 | static const struct vm_operations_struct fuse_file_vm_ops = { |
3be5a52b MS |
1419 | .close = fuse_vma_close, |
1420 | .fault = filemap_fault, | |
1421 | .page_mkwrite = fuse_page_mkwrite, | |
0b173bc4 | 1422 | .remap_pages = generic_file_remap_pages, |
3be5a52b MS |
1423 | }; |
1424 | ||
1425 | static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1426 | { | |
1427 | if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) { | |
1428 | struct inode *inode = file->f_dentry->d_inode; | |
1429 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1430 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1431 | struct fuse_file *ff = file->private_data; | |
1432 | /* | |
1433 | * file may be written through mmap, so chain it onto the | |
1434 | * inodes's write_file list | |
1435 | */ | |
1436 | spin_lock(&fc->lock); | |
1437 | if (list_empty(&ff->write_entry)) | |
1438 | list_add(&ff->write_entry, &fi->write_files); | |
1439 | spin_unlock(&fc->lock); | |
1440 | } | |
1441 | file_accessed(file); | |
1442 | vma->vm_ops = &fuse_file_vm_ops; | |
b6aeaded MS |
1443 | return 0; |
1444 | } | |
1445 | ||
fc280c96 MS |
1446 | static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma) |
1447 | { | |
1448 | /* Can't provide the coherency needed for MAP_SHARED */ | |
1449 | if (vma->vm_flags & VM_MAYSHARE) | |
1450 | return -ENODEV; | |
1451 | ||
3121bfe7 MS |
1452 | invalidate_inode_pages2(file->f_mapping); |
1453 | ||
fc280c96 MS |
1454 | return generic_file_mmap(file, vma); |
1455 | } | |
1456 | ||
71421259 MS |
1457 | static int convert_fuse_file_lock(const struct fuse_file_lock *ffl, |
1458 | struct file_lock *fl) | |
1459 | { | |
1460 | switch (ffl->type) { | |
1461 | case F_UNLCK: | |
1462 | break; | |
1463 | ||
1464 | case F_RDLCK: | |
1465 | case F_WRLCK: | |
1466 | if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX || | |
1467 | ffl->end < ffl->start) | |
1468 | return -EIO; | |
1469 | ||
1470 | fl->fl_start = ffl->start; | |
1471 | fl->fl_end = ffl->end; | |
1472 | fl->fl_pid = ffl->pid; | |
1473 | break; | |
1474 | ||
1475 | default: | |
1476 | return -EIO; | |
1477 | } | |
1478 | fl->fl_type = ffl->type; | |
1479 | return 0; | |
1480 | } | |
1481 | ||
1482 | static void fuse_lk_fill(struct fuse_req *req, struct file *file, | |
a9ff4f87 MS |
1483 | const struct file_lock *fl, int opcode, pid_t pid, |
1484 | int flock) | |
71421259 | 1485 | { |
7706a9d6 | 1486 | struct inode *inode = file->f_path.dentry->d_inode; |
9c8ef561 | 1487 | struct fuse_conn *fc = get_fuse_conn(inode); |
71421259 MS |
1488 | struct fuse_file *ff = file->private_data; |
1489 | struct fuse_lk_in *arg = &req->misc.lk_in; | |
1490 | ||
1491 | arg->fh = ff->fh; | |
9c8ef561 | 1492 | arg->owner = fuse_lock_owner_id(fc, fl->fl_owner); |
71421259 MS |
1493 | arg->lk.start = fl->fl_start; |
1494 | arg->lk.end = fl->fl_end; | |
1495 | arg->lk.type = fl->fl_type; | |
1496 | arg->lk.pid = pid; | |
a9ff4f87 MS |
1497 | if (flock) |
1498 | arg->lk_flags |= FUSE_LK_FLOCK; | |
71421259 MS |
1499 | req->in.h.opcode = opcode; |
1500 | req->in.h.nodeid = get_node_id(inode); | |
1501 | req->in.numargs = 1; | |
1502 | req->in.args[0].size = sizeof(*arg); | |
1503 | req->in.args[0].value = arg; | |
1504 | } | |
1505 | ||
1506 | static int fuse_getlk(struct file *file, struct file_lock *fl) | |
1507 | { | |
7706a9d6 | 1508 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1509 | struct fuse_conn *fc = get_fuse_conn(inode); |
1510 | struct fuse_req *req; | |
1511 | struct fuse_lk_out outarg; | |
1512 | int err; | |
1513 | ||
b111c8c0 | 1514 | req = fuse_get_req_nopages(fc); |
71421259 MS |
1515 | if (IS_ERR(req)) |
1516 | return PTR_ERR(req); | |
1517 | ||
a9ff4f87 | 1518 | fuse_lk_fill(req, file, fl, FUSE_GETLK, 0, 0); |
71421259 MS |
1519 | req->out.numargs = 1; |
1520 | req->out.args[0].size = sizeof(outarg); | |
1521 | req->out.args[0].value = &outarg; | |
b93f858a | 1522 | fuse_request_send(fc, req); |
71421259 MS |
1523 | err = req->out.h.error; |
1524 | fuse_put_request(fc, req); | |
1525 | if (!err) | |
1526 | err = convert_fuse_file_lock(&outarg.lk, fl); | |
1527 | ||
1528 | return err; | |
1529 | } | |
1530 | ||
a9ff4f87 | 1531 | static int fuse_setlk(struct file *file, struct file_lock *fl, int flock) |
71421259 | 1532 | { |
7706a9d6 | 1533 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1534 | struct fuse_conn *fc = get_fuse_conn(inode); |
1535 | struct fuse_req *req; | |
1536 | int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK; | |
1537 | pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0; | |
1538 | int err; | |
1539 | ||
8fb47a4f | 1540 | if (fl->fl_lmops && fl->fl_lmops->lm_grant) { |
48e90761 MS |
1541 | /* NLM needs asynchronous locks, which we don't support yet */ |
1542 | return -ENOLCK; | |
1543 | } | |
1544 | ||
71421259 MS |
1545 | /* Unlock on close is handled by the flush method */ |
1546 | if (fl->fl_flags & FL_CLOSE) | |
1547 | return 0; | |
1548 | ||
b111c8c0 | 1549 | req = fuse_get_req_nopages(fc); |
71421259 MS |
1550 | if (IS_ERR(req)) |
1551 | return PTR_ERR(req); | |
1552 | ||
a9ff4f87 | 1553 | fuse_lk_fill(req, file, fl, opcode, pid, flock); |
b93f858a | 1554 | fuse_request_send(fc, req); |
71421259 | 1555 | err = req->out.h.error; |
a4d27e75 MS |
1556 | /* locking is restartable */ |
1557 | if (err == -EINTR) | |
1558 | err = -ERESTARTSYS; | |
71421259 MS |
1559 | fuse_put_request(fc, req); |
1560 | return err; | |
1561 | } | |
1562 | ||
1563 | static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) | |
1564 | { | |
7706a9d6 | 1565 | struct inode *inode = file->f_path.dentry->d_inode; |
71421259 MS |
1566 | struct fuse_conn *fc = get_fuse_conn(inode); |
1567 | int err; | |
1568 | ||
48e90761 MS |
1569 | if (cmd == F_CANCELLK) { |
1570 | err = 0; | |
1571 | } else if (cmd == F_GETLK) { | |
71421259 | 1572 | if (fc->no_lock) { |
9d6a8c5c | 1573 | posix_test_lock(file, fl); |
71421259 MS |
1574 | err = 0; |
1575 | } else | |
1576 | err = fuse_getlk(file, fl); | |
1577 | } else { | |
1578 | if (fc->no_lock) | |
48e90761 | 1579 | err = posix_lock_file(file, fl, NULL); |
71421259 | 1580 | else |
a9ff4f87 | 1581 | err = fuse_setlk(file, fl, 0); |
71421259 MS |
1582 | } |
1583 | return err; | |
1584 | } | |
1585 | ||
a9ff4f87 MS |
1586 | static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl) |
1587 | { | |
1588 | struct inode *inode = file->f_path.dentry->d_inode; | |
1589 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1590 | int err; | |
1591 | ||
37fb3a30 | 1592 | if (fc->no_flock) { |
a9ff4f87 MS |
1593 | err = flock_lock_file_wait(file, fl); |
1594 | } else { | |
37fb3a30 MS |
1595 | struct fuse_file *ff = file->private_data; |
1596 | ||
a9ff4f87 MS |
1597 | /* emulate flock with POSIX locks */ |
1598 | fl->fl_owner = (fl_owner_t) file; | |
37fb3a30 | 1599 | ff->flock = true; |
a9ff4f87 MS |
1600 | err = fuse_setlk(file, fl, 1); |
1601 | } | |
1602 | ||
1603 | return err; | |
1604 | } | |
1605 | ||
b2d2272f MS |
1606 | static sector_t fuse_bmap(struct address_space *mapping, sector_t block) |
1607 | { | |
1608 | struct inode *inode = mapping->host; | |
1609 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1610 | struct fuse_req *req; | |
1611 | struct fuse_bmap_in inarg; | |
1612 | struct fuse_bmap_out outarg; | |
1613 | int err; | |
1614 | ||
1615 | if (!inode->i_sb->s_bdev || fc->no_bmap) | |
1616 | return 0; | |
1617 | ||
b111c8c0 | 1618 | req = fuse_get_req_nopages(fc); |
b2d2272f MS |
1619 | if (IS_ERR(req)) |
1620 | return 0; | |
1621 | ||
1622 | memset(&inarg, 0, sizeof(inarg)); | |
1623 | inarg.block = block; | |
1624 | inarg.blocksize = inode->i_sb->s_blocksize; | |
1625 | req->in.h.opcode = FUSE_BMAP; | |
1626 | req->in.h.nodeid = get_node_id(inode); | |
1627 | req->in.numargs = 1; | |
1628 | req->in.args[0].size = sizeof(inarg); | |
1629 | req->in.args[0].value = &inarg; | |
1630 | req->out.numargs = 1; | |
1631 | req->out.args[0].size = sizeof(outarg); | |
1632 | req->out.args[0].value = &outarg; | |
b93f858a | 1633 | fuse_request_send(fc, req); |
b2d2272f MS |
1634 | err = req->out.h.error; |
1635 | fuse_put_request(fc, req); | |
1636 | if (err == -ENOSYS) | |
1637 | fc->no_bmap = 1; | |
1638 | ||
1639 | return err ? 0 : outarg.block; | |
1640 | } | |
1641 | ||
965c8e59 | 1642 | static loff_t fuse_file_llseek(struct file *file, loff_t offset, int whence) |
5559b8f4 MS |
1643 | { |
1644 | loff_t retval; | |
1645 | struct inode *inode = file->f_path.dentry->d_inode; | |
1646 | ||
c07c3d19 | 1647 | /* No i_mutex protection necessary for SEEK_CUR and SEEK_SET */ |
965c8e59 AM |
1648 | if (whence == SEEK_CUR || whence == SEEK_SET) |
1649 | return generic_file_llseek(file, offset, whence); | |
06222e49 | 1650 | |
c07c3d19 MS |
1651 | mutex_lock(&inode->i_mutex); |
1652 | retval = fuse_update_attributes(inode, NULL, file, NULL); | |
1653 | if (!retval) | |
965c8e59 | 1654 | retval = generic_file_llseek(file, offset, whence); |
5559b8f4 | 1655 | mutex_unlock(&inode->i_mutex); |
c07c3d19 | 1656 | |
5559b8f4 MS |
1657 | return retval; |
1658 | } | |
1659 | ||
59efec7b TH |
1660 | static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov, |
1661 | unsigned int nr_segs, size_t bytes, bool to_user) | |
1662 | { | |
1663 | struct iov_iter ii; | |
1664 | int page_idx = 0; | |
1665 | ||
1666 | if (!bytes) | |
1667 | return 0; | |
1668 | ||
1669 | iov_iter_init(&ii, iov, nr_segs, bytes, 0); | |
1670 | ||
1671 | while (iov_iter_count(&ii)) { | |
1672 | struct page *page = pages[page_idx++]; | |
1673 | size_t todo = min_t(size_t, PAGE_SIZE, iov_iter_count(&ii)); | |
4aa0edd2 | 1674 | void *kaddr; |
59efec7b | 1675 | |
4aa0edd2 | 1676 | kaddr = kmap(page); |
59efec7b TH |
1677 | |
1678 | while (todo) { | |
1679 | char __user *uaddr = ii.iov->iov_base + ii.iov_offset; | |
1680 | size_t iov_len = ii.iov->iov_len - ii.iov_offset; | |
1681 | size_t copy = min(todo, iov_len); | |
1682 | size_t left; | |
1683 | ||
1684 | if (!to_user) | |
1685 | left = copy_from_user(kaddr, uaddr, copy); | |
1686 | else | |
1687 | left = copy_to_user(uaddr, kaddr, copy); | |
1688 | ||
1689 | if (unlikely(left)) | |
1690 | return -EFAULT; | |
1691 | ||
1692 | iov_iter_advance(&ii, copy); | |
1693 | todo -= copy; | |
1694 | kaddr += copy; | |
1695 | } | |
1696 | ||
0bd87182 | 1697 | kunmap(page); |
59efec7b TH |
1698 | } |
1699 | ||
1700 | return 0; | |
1701 | } | |
1702 | ||
d9d318d3 MS |
1703 | /* |
1704 | * CUSE servers compiled on 32bit broke on 64bit kernels because the | |
1705 | * ABI was defined to be 'struct iovec' which is different on 32bit | |
1706 | * and 64bit. Fortunately we can determine which structure the server | |
1707 | * used from the size of the reply. | |
1708 | */ | |
1baa26b2 MS |
1709 | static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src, |
1710 | size_t transferred, unsigned count, | |
1711 | bool is_compat) | |
d9d318d3 MS |
1712 | { |
1713 | #ifdef CONFIG_COMPAT | |
1714 | if (count * sizeof(struct compat_iovec) == transferred) { | |
1715 | struct compat_iovec *ciov = src; | |
1716 | unsigned i; | |
1717 | ||
1718 | /* | |
1719 | * With this interface a 32bit server cannot support | |
1720 | * non-compat (i.e. ones coming from 64bit apps) ioctl | |
1721 | * requests | |
1722 | */ | |
1723 | if (!is_compat) | |
1724 | return -EINVAL; | |
1725 | ||
1726 | for (i = 0; i < count; i++) { | |
1727 | dst[i].iov_base = compat_ptr(ciov[i].iov_base); | |
1728 | dst[i].iov_len = ciov[i].iov_len; | |
1729 | } | |
1730 | return 0; | |
1731 | } | |
1732 | #endif | |
1733 | ||
1734 | if (count * sizeof(struct iovec) != transferred) | |
1735 | return -EIO; | |
1736 | ||
1737 | memcpy(dst, src, transferred); | |
1738 | return 0; | |
1739 | } | |
1740 | ||
7572777e MS |
1741 | /* Make sure iov_length() won't overflow */ |
1742 | static int fuse_verify_ioctl_iov(struct iovec *iov, size_t count) | |
1743 | { | |
1744 | size_t n; | |
1745 | u32 max = FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT; | |
1746 | ||
fb6ccff6 | 1747 | for (n = 0; n < count; n++, iov++) { |
7572777e MS |
1748 | if (iov->iov_len > (size_t) max) |
1749 | return -ENOMEM; | |
1750 | max -= iov->iov_len; | |
1751 | } | |
1752 | return 0; | |
1753 | } | |
1754 | ||
1baa26b2 MS |
1755 | static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst, |
1756 | void *src, size_t transferred, unsigned count, | |
1757 | bool is_compat) | |
1758 | { | |
1759 | unsigned i; | |
1760 | struct fuse_ioctl_iovec *fiov = src; | |
1761 | ||
1762 | if (fc->minor < 16) { | |
1763 | return fuse_copy_ioctl_iovec_old(dst, src, transferred, | |
1764 | count, is_compat); | |
1765 | } | |
1766 | ||
1767 | if (count * sizeof(struct fuse_ioctl_iovec) != transferred) | |
1768 | return -EIO; | |
1769 | ||
1770 | for (i = 0; i < count; i++) { | |
1771 | /* Did the server supply an inappropriate value? */ | |
1772 | if (fiov[i].base != (unsigned long) fiov[i].base || | |
1773 | fiov[i].len != (unsigned long) fiov[i].len) | |
1774 | return -EIO; | |
1775 | ||
1776 | dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base; | |
1777 | dst[i].iov_len = (size_t) fiov[i].len; | |
1778 | ||
1779 | #ifdef CONFIG_COMPAT | |
1780 | if (is_compat && | |
1781 | (ptr_to_compat(dst[i].iov_base) != fiov[i].base || | |
1782 | (compat_size_t) dst[i].iov_len != fiov[i].len)) | |
1783 | return -EIO; | |
1784 | #endif | |
1785 | } | |
1786 | ||
1787 | return 0; | |
1788 | } | |
1789 | ||
1790 | ||
59efec7b TH |
1791 | /* |
1792 | * For ioctls, there is no generic way to determine how much memory | |
1793 | * needs to be read and/or written. Furthermore, ioctls are allowed | |
1794 | * to dereference the passed pointer, so the parameter requires deep | |
1795 | * copying but FUSE has no idea whatsoever about what to copy in or | |
1796 | * out. | |
1797 | * | |
1798 | * This is solved by allowing FUSE server to retry ioctl with | |
1799 | * necessary in/out iovecs. Let's assume the ioctl implementation | |
1800 | * needs to read in the following structure. | |
1801 | * | |
1802 | * struct a { | |
1803 | * char *buf; | |
1804 | * size_t buflen; | |
1805 | * } | |
1806 | * | |
1807 | * On the first callout to FUSE server, inarg->in_size and | |
1808 | * inarg->out_size will be NULL; then, the server completes the ioctl | |
1809 | * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and | |
1810 | * the actual iov array to | |
1811 | * | |
1812 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } } | |
1813 | * | |
1814 | * which tells FUSE to copy in the requested area and retry the ioctl. | |
1815 | * On the second round, the server has access to the structure and | |
1816 | * from that it can tell what to look for next, so on the invocation, | |
1817 | * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to | |
1818 | * | |
1819 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) }, | |
1820 | * { .iov_base = a.buf, .iov_len = a.buflen } } | |
1821 | * | |
1822 | * FUSE will copy both struct a and the pointed buffer from the | |
1823 | * process doing the ioctl and retry ioctl with both struct a and the | |
1824 | * buffer. | |
1825 | * | |
1826 | * This time, FUSE server has everything it needs and completes ioctl | |
1827 | * without FUSE_IOCTL_RETRY which finishes the ioctl call. | |
1828 | * | |
1829 | * Copying data out works the same way. | |
1830 | * | |
1831 | * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel | |
1832 | * automatically initializes in and out iovs by decoding @cmd with | |
1833 | * _IOC_* macros and the server is not allowed to request RETRY. This | |
1834 | * limits ioctl data transfers to well-formed ioctls and is the forced | |
1835 | * behavior for all FUSE servers. | |
1836 | */ | |
08cbf542 TH |
1837 | long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, |
1838 | unsigned int flags) | |
59efec7b | 1839 | { |
59efec7b | 1840 | struct fuse_file *ff = file->private_data; |
d36f2487 | 1841 | struct fuse_conn *fc = ff->fc; |
59efec7b TH |
1842 | struct fuse_ioctl_in inarg = { |
1843 | .fh = ff->fh, | |
1844 | .cmd = cmd, | |
1845 | .arg = arg, | |
1846 | .flags = flags | |
1847 | }; | |
1848 | struct fuse_ioctl_out outarg; | |
1849 | struct fuse_req *req = NULL; | |
1850 | struct page **pages = NULL; | |
8ac83505 | 1851 | struct iovec *iov_page = NULL; |
59efec7b TH |
1852 | struct iovec *in_iov = NULL, *out_iov = NULL; |
1853 | unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages; | |
1854 | size_t in_size, out_size, transferred; | |
1855 | int err; | |
1856 | ||
1baa26b2 MS |
1857 | #if BITS_PER_LONG == 32 |
1858 | inarg.flags |= FUSE_IOCTL_32BIT; | |
1859 | #else | |
1860 | if (flags & FUSE_IOCTL_COMPAT) | |
1861 | inarg.flags |= FUSE_IOCTL_32BIT; | |
1862 | #endif | |
1863 | ||
59efec7b | 1864 | /* assume all the iovs returned by client always fits in a page */ |
1baa26b2 | 1865 | BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE); |
59efec7b | 1866 | |
59efec7b | 1867 | err = -ENOMEM; |
c411cc88 | 1868 | pages = kcalloc(FUSE_MAX_PAGES_PER_REQ, sizeof(pages[0]), GFP_KERNEL); |
8ac83505 | 1869 | iov_page = (struct iovec *) __get_free_page(GFP_KERNEL); |
59efec7b TH |
1870 | if (!pages || !iov_page) |
1871 | goto out; | |
1872 | ||
1873 | /* | |
1874 | * If restricted, initialize IO parameters as encoded in @cmd. | |
1875 | * RETRY from server is not allowed. | |
1876 | */ | |
1877 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) { | |
8ac83505 | 1878 | struct iovec *iov = iov_page; |
59efec7b | 1879 | |
c9f0523d | 1880 | iov->iov_base = (void __user *)arg; |
59efec7b TH |
1881 | iov->iov_len = _IOC_SIZE(cmd); |
1882 | ||
1883 | if (_IOC_DIR(cmd) & _IOC_WRITE) { | |
1884 | in_iov = iov; | |
1885 | in_iovs = 1; | |
1886 | } | |
1887 | ||
1888 | if (_IOC_DIR(cmd) & _IOC_READ) { | |
1889 | out_iov = iov; | |
1890 | out_iovs = 1; | |
1891 | } | |
1892 | } | |
1893 | ||
1894 | retry: | |
1895 | inarg.in_size = in_size = iov_length(in_iov, in_iovs); | |
1896 | inarg.out_size = out_size = iov_length(out_iov, out_iovs); | |
1897 | ||
1898 | /* | |
1899 | * Out data can be used either for actual out data or iovs, | |
1900 | * make sure there always is at least one page. | |
1901 | */ | |
1902 | out_size = max_t(size_t, out_size, PAGE_SIZE); | |
1903 | max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE); | |
1904 | ||
1905 | /* make sure there are enough buffer pages and init request with them */ | |
1906 | err = -ENOMEM; | |
1907 | if (max_pages > FUSE_MAX_PAGES_PER_REQ) | |
1908 | goto out; | |
1909 | while (num_pages < max_pages) { | |
1910 | pages[num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM); | |
1911 | if (!pages[num_pages]) | |
1912 | goto out; | |
1913 | num_pages++; | |
1914 | } | |
1915 | ||
54b96670 | 1916 | req = fuse_get_req(fc, num_pages); |
59efec7b TH |
1917 | if (IS_ERR(req)) { |
1918 | err = PTR_ERR(req); | |
1919 | req = NULL; | |
1920 | goto out; | |
1921 | } | |
1922 | memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages); | |
1923 | req->num_pages = num_pages; | |
85f40aec | 1924 | fuse_page_descs_length_init(req); |
59efec7b TH |
1925 | |
1926 | /* okay, let's send it to the client */ | |
1927 | req->in.h.opcode = FUSE_IOCTL; | |
d36f2487 | 1928 | req->in.h.nodeid = ff->nodeid; |
59efec7b TH |
1929 | req->in.numargs = 1; |
1930 | req->in.args[0].size = sizeof(inarg); | |
1931 | req->in.args[0].value = &inarg; | |
1932 | if (in_size) { | |
1933 | req->in.numargs++; | |
1934 | req->in.args[1].size = in_size; | |
1935 | req->in.argpages = 1; | |
1936 | ||
1937 | err = fuse_ioctl_copy_user(pages, in_iov, in_iovs, in_size, | |
1938 | false); | |
1939 | if (err) | |
1940 | goto out; | |
1941 | } | |
1942 | ||
1943 | req->out.numargs = 2; | |
1944 | req->out.args[0].size = sizeof(outarg); | |
1945 | req->out.args[0].value = &outarg; | |
1946 | req->out.args[1].size = out_size; | |
1947 | req->out.argpages = 1; | |
1948 | req->out.argvar = 1; | |
1949 | ||
b93f858a | 1950 | fuse_request_send(fc, req); |
59efec7b TH |
1951 | err = req->out.h.error; |
1952 | transferred = req->out.args[1].size; | |
1953 | fuse_put_request(fc, req); | |
1954 | req = NULL; | |
1955 | if (err) | |
1956 | goto out; | |
1957 | ||
1958 | /* did it ask for retry? */ | |
1959 | if (outarg.flags & FUSE_IOCTL_RETRY) { | |
8ac83505 | 1960 | void *vaddr; |
59efec7b TH |
1961 | |
1962 | /* no retry if in restricted mode */ | |
1963 | err = -EIO; | |
1964 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) | |
1965 | goto out; | |
1966 | ||
1967 | in_iovs = outarg.in_iovs; | |
1968 | out_iovs = outarg.out_iovs; | |
1969 | ||
1970 | /* | |
1971 | * Make sure things are in boundary, separate checks | |
1972 | * are to protect against overflow. | |
1973 | */ | |
1974 | err = -ENOMEM; | |
1975 | if (in_iovs > FUSE_IOCTL_MAX_IOV || | |
1976 | out_iovs > FUSE_IOCTL_MAX_IOV || | |
1977 | in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV) | |
1978 | goto out; | |
1979 | ||
2408f6ef | 1980 | vaddr = kmap_atomic(pages[0]); |
1baa26b2 | 1981 | err = fuse_copy_ioctl_iovec(fc, iov_page, vaddr, |
d9d318d3 MS |
1982 | transferred, in_iovs + out_iovs, |
1983 | (flags & FUSE_IOCTL_COMPAT) != 0); | |
2408f6ef | 1984 | kunmap_atomic(vaddr); |
d9d318d3 MS |
1985 | if (err) |
1986 | goto out; | |
59efec7b | 1987 | |
8ac83505 | 1988 | in_iov = iov_page; |
59efec7b TH |
1989 | out_iov = in_iov + in_iovs; |
1990 | ||
7572777e MS |
1991 | err = fuse_verify_ioctl_iov(in_iov, in_iovs); |
1992 | if (err) | |
1993 | goto out; | |
1994 | ||
1995 | err = fuse_verify_ioctl_iov(out_iov, out_iovs); | |
1996 | if (err) | |
1997 | goto out; | |
1998 | ||
59efec7b TH |
1999 | goto retry; |
2000 | } | |
2001 | ||
2002 | err = -EIO; | |
2003 | if (transferred > inarg.out_size) | |
2004 | goto out; | |
2005 | ||
2006 | err = fuse_ioctl_copy_user(pages, out_iov, out_iovs, transferred, true); | |
2007 | out: | |
2008 | if (req) | |
2009 | fuse_put_request(fc, req); | |
8ac83505 | 2010 | free_page((unsigned long) iov_page); |
59efec7b TH |
2011 | while (num_pages) |
2012 | __free_page(pages[--num_pages]); | |
2013 | kfree(pages); | |
2014 | ||
2015 | return err ? err : outarg.result; | |
2016 | } | |
08cbf542 | 2017 | EXPORT_SYMBOL_GPL(fuse_do_ioctl); |
59efec7b | 2018 | |
b18da0c5 MS |
2019 | long fuse_ioctl_common(struct file *file, unsigned int cmd, |
2020 | unsigned long arg, unsigned int flags) | |
d36f2487 MS |
2021 | { |
2022 | struct inode *inode = file->f_dentry->d_inode; | |
2023 | struct fuse_conn *fc = get_fuse_conn(inode); | |
2024 | ||
2025 | if (!fuse_allow_task(fc, current)) | |
2026 | return -EACCES; | |
2027 | ||
2028 | if (is_bad_inode(inode)) | |
2029 | return -EIO; | |
2030 | ||
2031 | return fuse_do_ioctl(file, cmd, arg, flags); | |
2032 | } | |
2033 | ||
59efec7b TH |
2034 | static long fuse_file_ioctl(struct file *file, unsigned int cmd, |
2035 | unsigned long arg) | |
2036 | { | |
b18da0c5 | 2037 | return fuse_ioctl_common(file, cmd, arg, 0); |
59efec7b TH |
2038 | } |
2039 | ||
2040 | static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd, | |
2041 | unsigned long arg) | |
2042 | { | |
b18da0c5 | 2043 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT); |
59efec7b TH |
2044 | } |
2045 | ||
95668a69 TH |
2046 | /* |
2047 | * All files which have been polled are linked to RB tree | |
2048 | * fuse_conn->polled_files which is indexed by kh. Walk the tree and | |
2049 | * find the matching one. | |
2050 | */ | |
2051 | static struct rb_node **fuse_find_polled_node(struct fuse_conn *fc, u64 kh, | |
2052 | struct rb_node **parent_out) | |
2053 | { | |
2054 | struct rb_node **link = &fc->polled_files.rb_node; | |
2055 | struct rb_node *last = NULL; | |
2056 | ||
2057 | while (*link) { | |
2058 | struct fuse_file *ff; | |
2059 | ||
2060 | last = *link; | |
2061 | ff = rb_entry(last, struct fuse_file, polled_node); | |
2062 | ||
2063 | if (kh < ff->kh) | |
2064 | link = &last->rb_left; | |
2065 | else if (kh > ff->kh) | |
2066 | link = &last->rb_right; | |
2067 | else | |
2068 | return link; | |
2069 | } | |
2070 | ||
2071 | if (parent_out) | |
2072 | *parent_out = last; | |
2073 | return link; | |
2074 | } | |
2075 | ||
2076 | /* | |
2077 | * The file is about to be polled. Make sure it's on the polled_files | |
2078 | * RB tree. Note that files once added to the polled_files tree are | |
2079 | * not removed before the file is released. This is because a file | |
2080 | * polled once is likely to be polled again. | |
2081 | */ | |
2082 | static void fuse_register_polled_file(struct fuse_conn *fc, | |
2083 | struct fuse_file *ff) | |
2084 | { | |
2085 | spin_lock(&fc->lock); | |
2086 | if (RB_EMPTY_NODE(&ff->polled_node)) { | |
2087 | struct rb_node **link, *parent; | |
2088 | ||
2089 | link = fuse_find_polled_node(fc, ff->kh, &parent); | |
2090 | BUG_ON(*link); | |
2091 | rb_link_node(&ff->polled_node, parent, link); | |
2092 | rb_insert_color(&ff->polled_node, &fc->polled_files); | |
2093 | } | |
2094 | spin_unlock(&fc->lock); | |
2095 | } | |
2096 | ||
08cbf542 | 2097 | unsigned fuse_file_poll(struct file *file, poll_table *wait) |
95668a69 | 2098 | { |
95668a69 | 2099 | struct fuse_file *ff = file->private_data; |
797759aa | 2100 | struct fuse_conn *fc = ff->fc; |
95668a69 TH |
2101 | struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh }; |
2102 | struct fuse_poll_out outarg; | |
2103 | struct fuse_req *req; | |
2104 | int err; | |
2105 | ||
2106 | if (fc->no_poll) | |
2107 | return DEFAULT_POLLMASK; | |
2108 | ||
2109 | poll_wait(file, &ff->poll_wait, wait); | |
2110 | ||
2111 | /* | |
2112 | * Ask for notification iff there's someone waiting for it. | |
2113 | * The client may ignore the flag and always notify. | |
2114 | */ | |
2115 | if (waitqueue_active(&ff->poll_wait)) { | |
2116 | inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY; | |
2117 | fuse_register_polled_file(fc, ff); | |
2118 | } | |
2119 | ||
b111c8c0 | 2120 | req = fuse_get_req_nopages(fc); |
95668a69 | 2121 | if (IS_ERR(req)) |
201fa69a | 2122 | return POLLERR; |
95668a69 TH |
2123 | |
2124 | req->in.h.opcode = FUSE_POLL; | |
797759aa | 2125 | req->in.h.nodeid = ff->nodeid; |
95668a69 TH |
2126 | req->in.numargs = 1; |
2127 | req->in.args[0].size = sizeof(inarg); | |
2128 | req->in.args[0].value = &inarg; | |
2129 | req->out.numargs = 1; | |
2130 | req->out.args[0].size = sizeof(outarg); | |
2131 | req->out.args[0].value = &outarg; | |
b93f858a | 2132 | fuse_request_send(fc, req); |
95668a69 TH |
2133 | err = req->out.h.error; |
2134 | fuse_put_request(fc, req); | |
2135 | ||
2136 | if (!err) | |
2137 | return outarg.revents; | |
2138 | if (err == -ENOSYS) { | |
2139 | fc->no_poll = 1; | |
2140 | return DEFAULT_POLLMASK; | |
2141 | } | |
2142 | return POLLERR; | |
2143 | } | |
08cbf542 | 2144 | EXPORT_SYMBOL_GPL(fuse_file_poll); |
95668a69 TH |
2145 | |
2146 | /* | |
2147 | * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and | |
2148 | * wakes up the poll waiters. | |
2149 | */ | |
2150 | int fuse_notify_poll_wakeup(struct fuse_conn *fc, | |
2151 | struct fuse_notify_poll_wakeup_out *outarg) | |
2152 | { | |
2153 | u64 kh = outarg->kh; | |
2154 | struct rb_node **link; | |
2155 | ||
2156 | spin_lock(&fc->lock); | |
2157 | ||
2158 | link = fuse_find_polled_node(fc, kh, NULL); | |
2159 | if (*link) { | |
2160 | struct fuse_file *ff; | |
2161 | ||
2162 | ff = rb_entry(*link, struct fuse_file, polled_node); | |
2163 | wake_up_interruptible_sync(&ff->poll_wait); | |
2164 | } | |
2165 | ||
2166 | spin_unlock(&fc->lock); | |
2167 | return 0; | |
2168 | } | |
2169 | ||
4273b793 AA |
2170 | static ssize_t fuse_loop_dio(struct file *filp, const struct iovec *iov, |
2171 | unsigned long nr_segs, loff_t *ppos, int rw) | |
2172 | { | |
2173 | const struct iovec *vector = iov; | |
2174 | ssize_t ret = 0; | |
2175 | ||
2176 | while (nr_segs > 0) { | |
2177 | void __user *base; | |
2178 | size_t len; | |
2179 | ssize_t nr; | |
2180 | ||
2181 | base = vector->iov_base; | |
2182 | len = vector->iov_len; | |
2183 | vector++; | |
2184 | nr_segs--; | |
2185 | ||
2186 | if (rw == WRITE) | |
2187 | nr = __fuse_direct_write(filp, base, len, ppos); | |
2188 | else | |
2189 | nr = fuse_direct_read(filp, base, len, ppos); | |
2190 | ||
2191 | if (nr < 0) { | |
2192 | if (!ret) | |
2193 | ret = nr; | |
2194 | break; | |
2195 | } | |
2196 | ret += nr; | |
2197 | if (nr != len) | |
2198 | break; | |
2199 | } | |
2200 | ||
2201 | return ret; | |
2202 | } | |
2203 | ||
2204 | ||
2205 | static ssize_t | |
2206 | fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, | |
2207 | loff_t offset, unsigned long nr_segs) | |
2208 | { | |
2209 | ssize_t ret = 0; | |
2210 | struct file *file = NULL; | |
2211 | loff_t pos = 0; | |
2212 | ||
2213 | file = iocb->ki_filp; | |
2214 | pos = offset; | |
2215 | ||
2216 | ret = fuse_loop_dio(file, iov, nr_segs, &pos, rw); | |
2217 | ||
2218 | return ret; | |
2219 | } | |
2220 | ||
cdadb11c MS |
2221 | static long fuse_file_fallocate(struct file *file, int mode, loff_t offset, |
2222 | loff_t length) | |
05ba1f08 AP |
2223 | { |
2224 | struct fuse_file *ff = file->private_data; | |
2225 | struct fuse_conn *fc = ff->fc; | |
2226 | struct fuse_req *req; | |
2227 | struct fuse_fallocate_in inarg = { | |
2228 | .fh = ff->fh, | |
2229 | .offset = offset, | |
2230 | .length = length, | |
2231 | .mode = mode | |
2232 | }; | |
2233 | int err; | |
2234 | ||
519c6040 MS |
2235 | if (fc->no_fallocate) |
2236 | return -EOPNOTSUPP; | |
2237 | ||
b111c8c0 | 2238 | req = fuse_get_req_nopages(fc); |
05ba1f08 AP |
2239 | if (IS_ERR(req)) |
2240 | return PTR_ERR(req); | |
2241 | ||
2242 | req->in.h.opcode = FUSE_FALLOCATE; | |
2243 | req->in.h.nodeid = ff->nodeid; | |
2244 | req->in.numargs = 1; | |
2245 | req->in.args[0].size = sizeof(inarg); | |
2246 | req->in.args[0].value = &inarg; | |
2247 | fuse_request_send(fc, req); | |
2248 | err = req->out.h.error; | |
519c6040 MS |
2249 | if (err == -ENOSYS) { |
2250 | fc->no_fallocate = 1; | |
2251 | err = -EOPNOTSUPP; | |
2252 | } | |
05ba1f08 AP |
2253 | fuse_put_request(fc, req); |
2254 | ||
2255 | return err; | |
2256 | } | |
05ba1f08 | 2257 | |
4b6f5d20 | 2258 | static const struct file_operations fuse_file_operations = { |
5559b8f4 | 2259 | .llseek = fuse_file_llseek, |
543ade1f | 2260 | .read = do_sync_read, |
bcb4be80 | 2261 | .aio_read = fuse_file_aio_read, |
543ade1f | 2262 | .write = do_sync_write, |
ea9b9907 | 2263 | .aio_write = fuse_file_aio_write, |
b6aeaded MS |
2264 | .mmap = fuse_file_mmap, |
2265 | .open = fuse_open, | |
2266 | .flush = fuse_flush, | |
2267 | .release = fuse_release, | |
2268 | .fsync = fuse_fsync, | |
71421259 | 2269 | .lock = fuse_file_lock, |
a9ff4f87 | 2270 | .flock = fuse_file_flock, |
5ffc4ef4 | 2271 | .splice_read = generic_file_splice_read, |
59efec7b TH |
2272 | .unlocked_ioctl = fuse_file_ioctl, |
2273 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 2274 | .poll = fuse_file_poll, |
05ba1f08 | 2275 | .fallocate = fuse_file_fallocate, |
b6aeaded MS |
2276 | }; |
2277 | ||
4b6f5d20 | 2278 | static const struct file_operations fuse_direct_io_file_operations = { |
5559b8f4 | 2279 | .llseek = fuse_file_llseek, |
413ef8cb MS |
2280 | .read = fuse_direct_read, |
2281 | .write = fuse_direct_write, | |
fc280c96 | 2282 | .mmap = fuse_direct_mmap, |
413ef8cb MS |
2283 | .open = fuse_open, |
2284 | .flush = fuse_flush, | |
2285 | .release = fuse_release, | |
2286 | .fsync = fuse_fsync, | |
71421259 | 2287 | .lock = fuse_file_lock, |
a9ff4f87 | 2288 | .flock = fuse_file_flock, |
59efec7b TH |
2289 | .unlocked_ioctl = fuse_file_ioctl, |
2290 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 2291 | .poll = fuse_file_poll, |
05ba1f08 | 2292 | .fallocate = fuse_file_fallocate, |
fc280c96 | 2293 | /* no splice_read */ |
413ef8cb MS |
2294 | }; |
2295 | ||
f5e54d6e | 2296 | static const struct address_space_operations fuse_file_aops = { |
b6aeaded | 2297 | .readpage = fuse_readpage, |
3be5a52b MS |
2298 | .writepage = fuse_writepage, |
2299 | .launder_page = fuse_launder_page, | |
db50b96c | 2300 | .readpages = fuse_readpages, |
3be5a52b | 2301 | .set_page_dirty = __set_page_dirty_nobuffers, |
b2d2272f | 2302 | .bmap = fuse_bmap, |
4273b793 | 2303 | .direct_IO = fuse_direct_IO, |
b6aeaded MS |
2304 | }; |
2305 | ||
2306 | void fuse_init_file_inode(struct inode *inode) | |
2307 | { | |
45323fb7 MS |
2308 | inode->i_fop = &fuse_file_operations; |
2309 | inode->i_data.a_ops = &fuse_file_aops; | |
b6aeaded | 2310 | } |