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> |
3634a632 | 18 | #include <linux/falloc.h> |
e2e40f2c | 19 | #include <linux/uio.h> |
b6aeaded | 20 | |
4b6f5d20 | 21 | static const struct file_operations fuse_direct_io_file_operations; |
45323fb7 | 22 | |
91fe96b4 MS |
23 | static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
24 | int opcode, struct fuse_open_out *outargp) | |
b6aeaded | 25 | { |
b6aeaded | 26 | struct fuse_open_in inarg; |
7078187a | 27 | FUSE_ARGS(args); |
fd72faac MS |
28 | |
29 | memset(&inarg, 0, sizeof(inarg)); | |
6ff958ed MS |
30 | inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY); |
31 | if (!fc->atomic_o_trunc) | |
32 | inarg.flags &= ~O_TRUNC; | |
7078187a MS |
33 | args.in.h.opcode = opcode; |
34 | args.in.h.nodeid = nodeid; | |
35 | args.in.numargs = 1; | |
36 | args.in.args[0].size = sizeof(inarg); | |
37 | args.in.args[0].value = &inarg; | |
38 | args.out.numargs = 1; | |
39 | args.out.args[0].size = sizeof(*outargp); | |
40 | args.out.args[0].value = outargp; | |
fd72faac | 41 | |
7078187a | 42 | return fuse_simple_request(fc, &args); |
fd72faac MS |
43 | } |
44 | ||
acf99433 | 45 | struct fuse_file *fuse_file_alloc(struct fuse_conn *fc) |
fd72faac MS |
46 | { |
47 | struct fuse_file *ff; | |
6b2db28a | 48 | |
fd72faac | 49 | ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL); |
6b2db28a TH |
50 | if (unlikely(!ff)) |
51 | return NULL; | |
52 | ||
da5e4714 | 53 | ff->fc = fc; |
4250c066 | 54 | ff->reserved_req = fuse_request_alloc(0); |
6b2db28a TH |
55 | if (unlikely(!ff->reserved_req)) { |
56 | kfree(ff); | |
57 | return NULL; | |
fd72faac | 58 | } |
6b2db28a TH |
59 | |
60 | INIT_LIST_HEAD(&ff->write_entry); | |
61 | atomic_set(&ff->count, 0); | |
62 | RB_CLEAR_NODE(&ff->polled_node); | |
63 | init_waitqueue_head(&ff->poll_wait); | |
64 | ||
65 | spin_lock(&fc->lock); | |
66 | ff->kh = ++fc->khctr; | |
67 | spin_unlock(&fc->lock); | |
68 | ||
fd72faac MS |
69 | return ff; |
70 | } | |
71 | ||
72 | void fuse_file_free(struct fuse_file *ff) | |
73 | { | |
33649c91 | 74 | fuse_request_free(ff->reserved_req); |
fd72faac MS |
75 | kfree(ff); |
76 | } | |
77 | ||
c7b7143c | 78 | struct fuse_file *fuse_file_get(struct fuse_file *ff) |
c756e0a4 MS |
79 | { |
80 | atomic_inc(&ff->count); | |
81 | return ff; | |
82 | } | |
83 | ||
819c4b3b MS |
84 | static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req) |
85 | { | |
baebccbe | 86 | iput(req->misc.release.inode); |
819c4b3b MS |
87 | } |
88 | ||
5a18ec17 | 89 | static void fuse_file_put(struct fuse_file *ff, bool sync) |
c756e0a4 MS |
90 | { |
91 | if (atomic_dec_and_test(&ff->count)) { | |
92 | struct fuse_req *req = ff->reserved_req; | |
8b0797a4 | 93 | |
7678ac50 AG |
94 | if (ff->fc->no_open) { |
95 | /* | |
96 | * Drop the release request when client does not | |
97 | * implement 'open' | |
98 | */ | |
99 | req->background = 0; | |
baebccbe | 100 | iput(req->misc.release.inode); |
7678ac50 AG |
101 | fuse_put_request(ff->fc, req); |
102 | } else if (sync) { | |
8b41e671 | 103 | req->background = 0; |
5a18ec17 | 104 | fuse_request_send(ff->fc, req); |
baebccbe | 105 | iput(req->misc.release.inode); |
5a18ec17 MS |
106 | fuse_put_request(ff->fc, req); |
107 | } else { | |
108 | req->end = fuse_release_end; | |
8b41e671 | 109 | req->background = 1; |
5a18ec17 MS |
110 | fuse_request_send_background(ff->fc, req); |
111 | } | |
c756e0a4 MS |
112 | kfree(ff); |
113 | } | |
114 | } | |
115 | ||
08cbf542 TH |
116 | int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, |
117 | bool isdir) | |
91fe96b4 | 118 | { |
91fe96b4 | 119 | struct fuse_file *ff; |
91fe96b4 MS |
120 | int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; |
121 | ||
122 | ff = fuse_file_alloc(fc); | |
123 | if (!ff) | |
124 | return -ENOMEM; | |
125 | ||
7678ac50 AG |
126 | ff->fh = 0; |
127 | ff->open_flags = FOPEN_KEEP_CACHE; /* Default for no-open */ | |
128 | if (!fc->no_open || isdir) { | |
129 | struct fuse_open_out outarg; | |
130 | int err; | |
131 | ||
132 | err = fuse_send_open(fc, nodeid, file, opcode, &outarg); | |
133 | if (!err) { | |
134 | ff->fh = outarg.fh; | |
135 | ff->open_flags = outarg.open_flags; | |
136 | ||
137 | } else if (err != -ENOSYS || isdir) { | |
138 | fuse_file_free(ff); | |
139 | return err; | |
140 | } else { | |
141 | fc->no_open = 1; | |
142 | } | |
91fe96b4 MS |
143 | } |
144 | ||
145 | if (isdir) | |
7678ac50 | 146 | ff->open_flags &= ~FOPEN_DIRECT_IO; |
91fe96b4 | 147 | |
91fe96b4 | 148 | ff->nodeid = nodeid; |
91fe96b4 MS |
149 | file->private_data = fuse_file_get(ff); |
150 | ||
151 | return 0; | |
152 | } | |
08cbf542 | 153 | EXPORT_SYMBOL_GPL(fuse_do_open); |
91fe96b4 | 154 | |
650b22b9 PE |
155 | static void fuse_link_write_file(struct file *file) |
156 | { | |
157 | struct inode *inode = file_inode(file); | |
158 | struct fuse_conn *fc = get_fuse_conn(inode); | |
159 | struct fuse_inode *fi = get_fuse_inode(inode); | |
160 | struct fuse_file *ff = file->private_data; | |
161 | /* | |
162 | * file may be written through mmap, so chain it onto the | |
163 | * inodes's write_file list | |
164 | */ | |
165 | spin_lock(&fc->lock); | |
166 | if (list_empty(&ff->write_entry)) | |
167 | list_add(&ff->write_entry, &fi->write_files); | |
168 | spin_unlock(&fc->lock); | |
169 | } | |
170 | ||
c7b7143c | 171 | void fuse_finish_open(struct inode *inode, struct file *file) |
fd72faac | 172 | { |
c7b7143c | 173 | struct fuse_file *ff = file->private_data; |
a0822c55 | 174 | struct fuse_conn *fc = get_fuse_conn(inode); |
c7b7143c MS |
175 | |
176 | if (ff->open_flags & FOPEN_DIRECT_IO) | |
fd72faac | 177 | file->f_op = &fuse_direct_io_file_operations; |
c7b7143c | 178 | if (!(ff->open_flags & FOPEN_KEEP_CACHE)) |
b1009979 | 179 | invalidate_inode_pages2(inode->i_mapping); |
c7b7143c | 180 | if (ff->open_flags & FOPEN_NONSEEKABLE) |
a7c1b990 | 181 | nonseekable_open(inode, file); |
a0822c55 KS |
182 | if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC)) { |
183 | struct fuse_inode *fi = get_fuse_inode(inode); | |
184 | ||
185 | spin_lock(&fc->lock); | |
186 | fi->attr_version = ++fc->attr_version; | |
187 | i_size_write(inode, 0); | |
188 | spin_unlock(&fc->lock); | |
189 | fuse_invalidate_attr(inode); | |
75caeecd MP |
190 | if (fc->writeback_cache) |
191 | file_update_time(file); | |
a0822c55 | 192 | } |
4d99ff8f PE |
193 | if ((file->f_mode & FMODE_WRITE) && fc->writeback_cache) |
194 | fuse_link_write_file(file); | |
fd72faac MS |
195 | } |
196 | ||
91fe96b4 | 197 | int fuse_open_common(struct inode *inode, struct file *file, bool isdir) |
fd72faac | 198 | { |
acf99433 | 199 | struct fuse_conn *fc = get_fuse_conn(inode); |
b6aeaded | 200 | int err; |
75caeecd MP |
201 | bool lock_inode = (file->f_flags & O_TRUNC) && |
202 | fc->atomic_o_trunc && | |
203 | fc->writeback_cache; | |
b6aeaded MS |
204 | |
205 | err = generic_file_open(inode, file); | |
206 | if (err) | |
207 | return err; | |
208 | ||
75caeecd MP |
209 | if (lock_inode) |
210 | mutex_lock(&inode->i_mutex); | |
211 | ||
91fe96b4 | 212 | err = fuse_do_open(fc, get_node_id(inode), file, isdir); |
b6aeaded | 213 | |
75caeecd MP |
214 | if (!err) |
215 | fuse_finish_open(inode, file); | |
91fe96b4 | 216 | |
75caeecd MP |
217 | if (lock_inode) |
218 | mutex_unlock(&inode->i_mutex); | |
219 | ||
220 | return err; | |
b6aeaded MS |
221 | } |
222 | ||
8b0797a4 | 223 | static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode) |
64c6d8ed | 224 | { |
8b0797a4 | 225 | struct fuse_conn *fc = ff->fc; |
33649c91 | 226 | struct fuse_req *req = ff->reserved_req; |
b57d4264 | 227 | struct fuse_release_in *inarg = &req->misc.release.in; |
b6aeaded | 228 | |
8b0797a4 MS |
229 | spin_lock(&fc->lock); |
230 | list_del(&ff->write_entry); | |
231 | if (!RB_EMPTY_NODE(&ff->polled_node)) | |
232 | rb_erase(&ff->polled_node, &fc->polled_files); | |
233 | spin_unlock(&fc->lock); | |
234 | ||
357ccf2b | 235 | wake_up_interruptible_all(&ff->poll_wait); |
8b0797a4 | 236 | |
b6aeaded | 237 | inarg->fh = ff->fh; |
fd72faac | 238 | inarg->flags = flags; |
51eb01e7 | 239 | req->in.h.opcode = opcode; |
c7b7143c | 240 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
241 | req->in.numargs = 1; |
242 | req->in.args[0].size = sizeof(struct fuse_release_in); | |
243 | req->in.args[0].value = inarg; | |
fd72faac MS |
244 | } |
245 | ||
8b0797a4 | 246 | void fuse_release_common(struct file *file, int opcode) |
fd72faac | 247 | { |
6b2db28a TH |
248 | struct fuse_file *ff; |
249 | struct fuse_req *req; | |
b6aeaded | 250 | |
6b2db28a TH |
251 | ff = file->private_data; |
252 | if (unlikely(!ff)) | |
8b0797a4 | 253 | return; |
6b2db28a | 254 | |
6b2db28a | 255 | req = ff->reserved_req; |
8b0797a4 | 256 | fuse_prepare_release(ff, file->f_flags, opcode); |
6b2db28a | 257 | |
37fb3a30 MS |
258 | if (ff->flock) { |
259 | struct fuse_release_in *inarg = &req->misc.release.in; | |
260 | inarg->release_flags |= FUSE_RELEASE_FLOCK_UNLOCK; | |
261 | inarg->lock_owner = fuse_lock_owner_id(ff->fc, | |
262 | (fl_owner_t) file); | |
263 | } | |
baebccbe MS |
264 | /* Hold inode until release is finished */ |
265 | req->misc.release.inode = igrab(file_inode(file)); | |
6b2db28a | 266 | |
6b2db28a TH |
267 | /* |
268 | * Normally this will send the RELEASE request, however if | |
269 | * some asynchronous READ or WRITE requests are outstanding, | |
270 | * the sending will be delayed. | |
5a18ec17 MS |
271 | * |
272 | * Make the release synchronous if this is a fuseblk mount, | |
273 | * synchronous RELEASE is allowed (and desirable) in this case | |
274 | * because the server can be trusted not to screw up. | |
6b2db28a | 275 | */ |
5a18ec17 | 276 | fuse_file_put(ff, ff->fc->destroy_req != NULL); |
b6aeaded MS |
277 | } |
278 | ||
04730fef MS |
279 | static int fuse_open(struct inode *inode, struct file *file) |
280 | { | |
91fe96b4 | 281 | return fuse_open_common(inode, file, false); |
04730fef MS |
282 | } |
283 | ||
284 | static int fuse_release(struct inode *inode, struct file *file) | |
285 | { | |
e7cc133c PE |
286 | struct fuse_conn *fc = get_fuse_conn(inode); |
287 | ||
288 | /* see fuse_vma_close() for !writeback_cache case */ | |
289 | if (fc->writeback_cache) | |
1e18bda8 | 290 | write_inode_now(inode, 1); |
b0aa7606 | 291 | |
8b0797a4 MS |
292 | fuse_release_common(file, FUSE_RELEASE); |
293 | ||
294 | /* return value is ignored by VFS */ | |
295 | return 0; | |
296 | } | |
297 | ||
298 | void fuse_sync_release(struct fuse_file *ff, int flags) | |
299 | { | |
300 | WARN_ON(atomic_read(&ff->count) > 1); | |
301 | fuse_prepare_release(ff, flags, FUSE_RELEASE); | |
302 | ff->reserved_req->force = 1; | |
8b41e671 | 303 | ff->reserved_req->background = 0; |
8b0797a4 MS |
304 | fuse_request_send(ff->fc, ff->reserved_req); |
305 | fuse_put_request(ff->fc, ff->reserved_req); | |
306 | kfree(ff); | |
04730fef | 307 | } |
08cbf542 | 308 | EXPORT_SYMBOL_GPL(fuse_sync_release); |
04730fef | 309 | |
71421259 | 310 | /* |
9c8ef561 MS |
311 | * Scramble the ID space with XTEA, so that the value of the files_struct |
312 | * pointer is not exposed to userspace. | |
71421259 | 313 | */ |
f3332114 | 314 | u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id) |
71421259 | 315 | { |
9c8ef561 MS |
316 | u32 *k = fc->scramble_key; |
317 | u64 v = (unsigned long) id; | |
318 | u32 v0 = v; | |
319 | u32 v1 = v >> 32; | |
320 | u32 sum = 0; | |
321 | int i; | |
322 | ||
323 | for (i = 0; i < 32; i++) { | |
324 | v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]); | |
325 | sum += 0x9E3779B9; | |
326 | v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]); | |
327 | } | |
328 | ||
329 | return (u64) v0 + ((u64) v1 << 32); | |
71421259 MS |
330 | } |
331 | ||
3be5a52b | 332 | /* |
ea8cd333 | 333 | * Check if any page in a range is under writeback |
3be5a52b MS |
334 | * |
335 | * This is currently done by walking the list of writepage requests | |
336 | * for the inode, which can be pretty inefficient. | |
337 | */ | |
ea8cd333 PE |
338 | static bool fuse_range_is_writeback(struct inode *inode, pgoff_t idx_from, |
339 | pgoff_t idx_to) | |
3be5a52b MS |
340 | { |
341 | struct fuse_conn *fc = get_fuse_conn(inode); | |
342 | struct fuse_inode *fi = get_fuse_inode(inode); | |
343 | struct fuse_req *req; | |
344 | bool found = false; | |
345 | ||
346 | spin_lock(&fc->lock); | |
347 | list_for_each_entry(req, &fi->writepages, writepages_entry) { | |
348 | pgoff_t curr_index; | |
349 | ||
350 | BUG_ON(req->inode != inode); | |
351 | curr_index = req->misc.write.in.offset >> PAGE_CACHE_SHIFT; | |
ea8cd333 PE |
352 | if (idx_from < curr_index + req->num_pages && |
353 | curr_index <= idx_to) { | |
3be5a52b MS |
354 | found = true; |
355 | break; | |
356 | } | |
357 | } | |
358 | spin_unlock(&fc->lock); | |
359 | ||
360 | return found; | |
361 | } | |
362 | ||
ea8cd333 PE |
363 | static inline bool fuse_page_is_writeback(struct inode *inode, pgoff_t index) |
364 | { | |
365 | return fuse_range_is_writeback(inode, index, index); | |
366 | } | |
367 | ||
3be5a52b MS |
368 | /* |
369 | * Wait for page writeback to be completed. | |
370 | * | |
371 | * Since fuse doesn't rely on the VM writeback tracking, this has to | |
372 | * use some other means. | |
373 | */ | |
374 | static int fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index) | |
375 | { | |
376 | struct fuse_inode *fi = get_fuse_inode(inode); | |
377 | ||
378 | wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index)); | |
379 | return 0; | |
380 | } | |
381 | ||
fe38d7df MP |
382 | /* |
383 | * Wait for all pending writepages on the inode to finish. | |
384 | * | |
385 | * This is currently done by blocking further writes with FUSE_NOWRITE | |
386 | * and waiting for all sent writes to complete. | |
387 | * | |
388 | * This must be called under i_mutex, otherwise the FUSE_NOWRITE usage | |
389 | * could conflict with truncation. | |
390 | */ | |
391 | static void fuse_sync_writes(struct inode *inode) | |
392 | { | |
393 | fuse_set_nowrite(inode); | |
394 | fuse_release_nowrite(inode); | |
395 | } | |
396 | ||
75e1fcc0 | 397 | static int fuse_flush(struct file *file, fl_owner_t id) |
b6aeaded | 398 | { |
6131ffaa | 399 | struct inode *inode = file_inode(file); |
b6aeaded MS |
400 | struct fuse_conn *fc = get_fuse_conn(inode); |
401 | struct fuse_file *ff = file->private_data; | |
402 | struct fuse_req *req; | |
403 | struct fuse_flush_in inarg; | |
404 | int err; | |
405 | ||
248d86e8 MS |
406 | if (is_bad_inode(inode)) |
407 | return -EIO; | |
408 | ||
b6aeaded MS |
409 | if (fc->no_flush) |
410 | return 0; | |
411 | ||
1e18bda8 | 412 | err = write_inode_now(inode, 1); |
fe38d7df MP |
413 | if (err) |
414 | return err; | |
415 | ||
416 | mutex_lock(&inode->i_mutex); | |
417 | fuse_sync_writes(inode); | |
418 | mutex_unlock(&inode->i_mutex); | |
419 | ||
b111c8c0 | 420 | req = fuse_get_req_nofail_nopages(fc, file); |
b6aeaded MS |
421 | memset(&inarg, 0, sizeof(inarg)); |
422 | inarg.fh = ff->fh; | |
9c8ef561 | 423 | inarg.lock_owner = fuse_lock_owner_id(fc, id); |
b6aeaded MS |
424 | req->in.h.opcode = FUSE_FLUSH; |
425 | req->in.h.nodeid = get_node_id(inode); | |
b6aeaded MS |
426 | req->in.numargs = 1; |
427 | req->in.args[0].size = sizeof(inarg); | |
428 | req->in.args[0].value = &inarg; | |
71421259 | 429 | req->force = 1; |
b93f858a | 430 | fuse_request_send(fc, req); |
b6aeaded MS |
431 | err = req->out.h.error; |
432 | fuse_put_request(fc, req); | |
433 | if (err == -ENOSYS) { | |
434 | fc->no_flush = 1; | |
435 | err = 0; | |
436 | } | |
437 | return err; | |
438 | } | |
439 | ||
02c24a82 JB |
440 | int fuse_fsync_common(struct file *file, loff_t start, loff_t end, |
441 | int datasync, int isdir) | |
b6aeaded | 442 | { |
7ea80859 | 443 | struct inode *inode = file->f_mapping->host; |
b6aeaded MS |
444 | struct fuse_conn *fc = get_fuse_conn(inode); |
445 | struct fuse_file *ff = file->private_data; | |
7078187a | 446 | FUSE_ARGS(args); |
b6aeaded MS |
447 | struct fuse_fsync_in inarg; |
448 | int err; | |
449 | ||
248d86e8 MS |
450 | if (is_bad_inode(inode)) |
451 | return -EIO; | |
452 | ||
02c24a82 JB |
453 | mutex_lock(&inode->i_mutex); |
454 | ||
3be5a52b MS |
455 | /* |
456 | * Start writeback against all dirty pages of the inode, then | |
457 | * wait for all outstanding writes, before sending the FSYNC | |
458 | * request. | |
459 | */ | |
22401e7b | 460 | err = filemap_write_and_wait_range(inode->i_mapping, start, end); |
3be5a52b | 461 | if (err) |
02c24a82 | 462 | goto out; |
3be5a52b MS |
463 | |
464 | fuse_sync_writes(inode); | |
1e18bda8 MS |
465 | err = sync_inode_metadata(inode, 1); |
466 | if (err) | |
467 | goto out; | |
3be5a52b | 468 | |
22401e7b MS |
469 | if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir)) |
470 | goto out; | |
b0aa7606 | 471 | |
b6aeaded MS |
472 | memset(&inarg, 0, sizeof(inarg)); |
473 | inarg.fh = ff->fh; | |
474 | inarg.fsync_flags = datasync ? 1 : 0; | |
7078187a MS |
475 | args.in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC; |
476 | args.in.h.nodeid = get_node_id(inode); | |
477 | args.in.numargs = 1; | |
478 | args.in.args[0].size = sizeof(inarg); | |
479 | args.in.args[0].value = &inarg; | |
480 | err = fuse_simple_request(fc, &args); | |
b6aeaded | 481 | if (err == -ENOSYS) { |
82547981 MS |
482 | if (isdir) |
483 | fc->no_fsyncdir = 1; | |
484 | else | |
485 | fc->no_fsync = 1; | |
b6aeaded MS |
486 | err = 0; |
487 | } | |
02c24a82 JB |
488 | out: |
489 | mutex_unlock(&inode->i_mutex); | |
b6aeaded MS |
490 | return err; |
491 | } | |
492 | ||
02c24a82 JB |
493 | static int fuse_fsync(struct file *file, loff_t start, loff_t end, |
494 | int datasync) | |
82547981 | 495 | { |
02c24a82 | 496 | return fuse_fsync_common(file, start, end, datasync, 0); |
82547981 MS |
497 | } |
498 | ||
2106cb18 MS |
499 | void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos, |
500 | size_t count, int opcode) | |
b6aeaded | 501 | { |
5c5c5e51 | 502 | struct fuse_read_in *inarg = &req->misc.read.in; |
a6643094 | 503 | struct fuse_file *ff = file->private_data; |
b6aeaded | 504 | |
361b1eb5 MS |
505 | inarg->fh = ff->fh; |
506 | inarg->offset = pos; | |
507 | inarg->size = count; | |
a6643094 | 508 | inarg->flags = file->f_flags; |
361b1eb5 | 509 | req->in.h.opcode = opcode; |
2106cb18 | 510 | req->in.h.nodeid = ff->nodeid; |
b6aeaded MS |
511 | req->in.numargs = 1; |
512 | req->in.args[0].size = sizeof(struct fuse_read_in); | |
c1aa96a5 | 513 | req->in.args[0].value = inarg; |
b6aeaded MS |
514 | req->out.argvar = 1; |
515 | req->out.numargs = 1; | |
516 | req->out.args[0].size = count; | |
b6aeaded MS |
517 | } |
518 | ||
187c5c36 MP |
519 | static void fuse_release_user_pages(struct fuse_req *req, int write) |
520 | { | |
521 | unsigned i; | |
522 | ||
523 | for (i = 0; i < req->num_pages; i++) { | |
524 | struct page *page = req->pages[i]; | |
525 | if (write) | |
526 | set_page_dirty_lock(page); | |
527 | put_page(page); | |
528 | } | |
529 | } | |
530 | ||
9d5722b7 CH |
531 | static ssize_t fuse_get_res_by_io(struct fuse_io_priv *io) |
532 | { | |
533 | if (io->err) | |
534 | return io->err; | |
535 | ||
536 | if (io->bytes >= 0 && io->write) | |
537 | return -EIO; | |
538 | ||
539 | return io->bytes < 0 ? io->size : io->bytes; | |
540 | } | |
541 | ||
01e9d11a MP |
542 | /** |
543 | * In case of short read, the caller sets 'pos' to the position of | |
544 | * actual end of fuse request in IO request. Otherwise, if bytes_requested | |
545 | * == bytes_transferred or rw == WRITE, the caller sets 'pos' to -1. | |
546 | * | |
547 | * An example: | |
548 | * User requested DIO read of 64K. It was splitted into two 32K fuse requests, | |
549 | * both submitted asynchronously. The first of them was ACKed by userspace as | |
550 | * fully completed (req->out.args[0].size == 32K) resulting in pos == -1. The | |
551 | * second request was ACKed as short, e.g. only 1K was read, resulting in | |
552 | * pos == 33K. | |
553 | * | |
554 | * Thus, when all fuse requests are completed, the minimal non-negative 'pos' | |
555 | * will be equal to the length of the longest contiguous fragment of | |
556 | * transferred data starting from the beginning of IO request. | |
557 | */ | |
558 | static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos) | |
559 | { | |
9d5722b7 | 560 | bool is_sync = is_sync_kiocb(io->iocb); |
01e9d11a MP |
561 | int left; |
562 | ||
563 | spin_lock(&io->lock); | |
564 | if (err) | |
565 | io->err = io->err ? : err; | |
566 | else if (pos >= 0 && (io->bytes < 0 || pos < io->bytes)) | |
567 | io->bytes = pos; | |
568 | ||
569 | left = --io->reqs; | |
9d5722b7 CH |
570 | if (!left && is_sync) |
571 | complete(io->done); | |
01e9d11a MP |
572 | spin_unlock(&io->lock); |
573 | ||
9d5722b7 CH |
574 | if (!left && !is_sync) { |
575 | ssize_t res = fuse_get_res_by_io(io); | |
01e9d11a | 576 | |
9d5722b7 CH |
577 | if (res >= 0) { |
578 | struct inode *inode = file_inode(io->iocb->ki_filp); | |
579 | struct fuse_conn *fc = get_fuse_conn(inode); | |
580 | struct fuse_inode *fi = get_fuse_inode(inode); | |
01e9d11a | 581 | |
9d5722b7 CH |
582 | spin_lock(&fc->lock); |
583 | fi->attr_version = ++fc->attr_version; | |
584 | spin_unlock(&fc->lock); | |
01e9d11a MP |
585 | } |
586 | ||
04b2fa9f | 587 | io->iocb->ki_complete(io->iocb, res, 0); |
01e9d11a MP |
588 | kfree(io); |
589 | } | |
590 | } | |
591 | ||
592 | static void fuse_aio_complete_req(struct fuse_conn *fc, struct fuse_req *req) | |
593 | { | |
594 | struct fuse_io_priv *io = req->io; | |
595 | ssize_t pos = -1; | |
596 | ||
597 | fuse_release_user_pages(req, !io->write); | |
598 | ||
599 | if (io->write) { | |
600 | if (req->misc.write.in.size != req->misc.write.out.size) | |
601 | pos = req->misc.write.in.offset - io->offset + | |
602 | req->misc.write.out.size; | |
603 | } else { | |
604 | if (req->misc.read.in.size != req->out.args[0].size) | |
605 | pos = req->misc.read.in.offset - io->offset + | |
606 | req->out.args[0].size; | |
607 | } | |
608 | ||
609 | fuse_aio_complete(io, req->out.h.error, pos); | |
610 | } | |
611 | ||
612 | static size_t fuse_async_req_send(struct fuse_conn *fc, struct fuse_req *req, | |
613 | size_t num_bytes, struct fuse_io_priv *io) | |
614 | { | |
615 | spin_lock(&io->lock); | |
616 | io->size += num_bytes; | |
617 | io->reqs++; | |
618 | spin_unlock(&io->lock); | |
619 | ||
620 | req->io = io; | |
621 | req->end = fuse_aio_complete_req; | |
622 | ||
36cf66ed | 623 | __fuse_get_request(req); |
01e9d11a MP |
624 | fuse_request_send_background(fc, req); |
625 | ||
626 | return num_bytes; | |
627 | } | |
628 | ||
36cf66ed | 629 | static size_t fuse_send_read(struct fuse_req *req, struct fuse_io_priv *io, |
2106cb18 | 630 | loff_t pos, size_t count, fl_owner_t owner) |
04730fef | 631 | { |
36cf66ed | 632 | struct file *file = io->file; |
2106cb18 MS |
633 | struct fuse_file *ff = file->private_data; |
634 | struct fuse_conn *fc = ff->fc; | |
f3332114 | 635 | |
2106cb18 | 636 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
f3332114 | 637 | if (owner != NULL) { |
5c5c5e51 | 638 | struct fuse_read_in *inarg = &req->misc.read.in; |
f3332114 MS |
639 | |
640 | inarg->read_flags |= FUSE_READ_LOCKOWNER; | |
641 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
642 | } | |
36cf66ed MP |
643 | |
644 | if (io->async) | |
645 | return fuse_async_req_send(fc, req, count, io); | |
646 | ||
b93f858a | 647 | fuse_request_send(fc, req); |
361b1eb5 | 648 | return req->out.args[0].size; |
04730fef MS |
649 | } |
650 | ||
5c5c5e51 MS |
651 | static void fuse_read_update_size(struct inode *inode, loff_t size, |
652 | u64 attr_ver) | |
653 | { | |
654 | struct fuse_conn *fc = get_fuse_conn(inode); | |
655 | struct fuse_inode *fi = get_fuse_inode(inode); | |
656 | ||
657 | spin_lock(&fc->lock); | |
06a7c3c2 MP |
658 | if (attr_ver == fi->attr_version && size < inode->i_size && |
659 | !test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) { | |
5c5c5e51 MS |
660 | fi->attr_version = ++fc->attr_version; |
661 | i_size_write(inode, size); | |
662 | } | |
663 | spin_unlock(&fc->lock); | |
664 | } | |
665 | ||
a92adc82 PE |
666 | static void fuse_short_read(struct fuse_req *req, struct inode *inode, |
667 | u64 attr_ver) | |
668 | { | |
669 | size_t num_read = req->out.args[0].size; | |
8373200b PE |
670 | struct fuse_conn *fc = get_fuse_conn(inode); |
671 | ||
672 | if (fc->writeback_cache) { | |
673 | /* | |
674 | * A hole in a file. Some data after the hole are in page cache, | |
675 | * but have not reached the client fs yet. So, the hole is not | |
676 | * present there. | |
677 | */ | |
678 | int i; | |
679 | int start_idx = num_read >> PAGE_CACHE_SHIFT; | |
680 | size_t off = num_read & (PAGE_CACHE_SIZE - 1); | |
a92adc82 | 681 | |
8373200b PE |
682 | for (i = start_idx; i < req->num_pages; i++) { |
683 | zero_user_segment(req->pages[i], off, PAGE_CACHE_SIZE); | |
684 | off = 0; | |
685 | } | |
686 | } else { | |
687 | loff_t pos = page_offset(req->pages[0]) + num_read; | |
688 | fuse_read_update_size(inode, pos, attr_ver); | |
689 | } | |
a92adc82 PE |
690 | } |
691 | ||
482fce55 | 692 | static int fuse_do_readpage(struct file *file, struct page *page) |
b6aeaded | 693 | { |
36cf66ed | 694 | struct fuse_io_priv io = { .async = 0, .file = file }; |
b6aeaded MS |
695 | struct inode *inode = page->mapping->host; |
696 | struct fuse_conn *fc = get_fuse_conn(inode); | |
248d86e8 | 697 | struct fuse_req *req; |
5c5c5e51 MS |
698 | size_t num_read; |
699 | loff_t pos = page_offset(page); | |
700 | size_t count = PAGE_CACHE_SIZE; | |
701 | u64 attr_ver; | |
248d86e8 MS |
702 | int err; |
703 | ||
3be5a52b | 704 | /* |
25985edc | 705 | * Page writeback can extend beyond the lifetime of the |
3be5a52b MS |
706 | * page-cache page, so make sure we read a properly synced |
707 | * page. | |
708 | */ | |
709 | fuse_wait_on_page_writeback(inode, page->index); | |
710 | ||
b111c8c0 | 711 | req = fuse_get_req(fc, 1); |
ce1d5a49 | 712 | if (IS_ERR(req)) |
482fce55 | 713 | return PTR_ERR(req); |
b6aeaded | 714 | |
5c5c5e51 MS |
715 | attr_ver = fuse_get_attr_version(fc); |
716 | ||
b6aeaded | 717 | req->out.page_zeroing = 1; |
f4975c67 | 718 | req->out.argpages = 1; |
b6aeaded MS |
719 | req->num_pages = 1; |
720 | req->pages[0] = page; | |
85f40aec | 721 | req->page_descs[0].length = count; |
36cf66ed | 722 | num_read = fuse_send_read(req, &io, pos, count, NULL); |
b6aeaded | 723 | err = req->out.h.error; |
5c5c5e51 MS |
724 | |
725 | if (!err) { | |
726 | /* | |
727 | * Short read means EOF. If file size is larger, truncate it | |
728 | */ | |
729 | if (num_read < count) | |
a92adc82 | 730 | fuse_short_read(req, inode, attr_ver); |
5c5c5e51 | 731 | |
b6aeaded | 732 | SetPageUptodate(page); |
5c5c5e51 MS |
733 | } |
734 | ||
a92adc82 | 735 | fuse_put_request(fc, req); |
482fce55 MP |
736 | |
737 | return err; | |
738 | } | |
739 | ||
740 | static int fuse_readpage(struct file *file, struct page *page) | |
741 | { | |
742 | struct inode *inode = page->mapping->host; | |
743 | int err; | |
744 | ||
745 | err = -EIO; | |
746 | if (is_bad_inode(inode)) | |
747 | goto out; | |
748 | ||
749 | err = fuse_do_readpage(file, page); | |
451418fc | 750 | fuse_invalidate_atime(inode); |
b6aeaded MS |
751 | out: |
752 | unlock_page(page); | |
753 | return err; | |
754 | } | |
755 | ||
c1aa96a5 | 756 | static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req) |
db50b96c | 757 | { |
c1aa96a5 | 758 | int i; |
5c5c5e51 MS |
759 | size_t count = req->misc.read.in.size; |
760 | size_t num_read = req->out.args[0].size; | |
ce534fb0 | 761 | struct address_space *mapping = NULL; |
c1aa96a5 | 762 | |
ce534fb0 MS |
763 | for (i = 0; mapping == NULL && i < req->num_pages; i++) |
764 | mapping = req->pages[i]->mapping; | |
5c5c5e51 | 765 | |
ce534fb0 MS |
766 | if (mapping) { |
767 | struct inode *inode = mapping->host; | |
768 | ||
769 | /* | |
770 | * Short read means EOF. If file size is larger, truncate it | |
771 | */ | |
a92adc82 PE |
772 | if (!req->out.h.error && num_read < count) |
773 | fuse_short_read(req, inode, req->misc.read.attr_ver); | |
ce534fb0 | 774 | |
451418fc | 775 | fuse_invalidate_atime(inode); |
ce534fb0 | 776 | } |
c1aa96a5 | 777 | |
db50b96c MS |
778 | for (i = 0; i < req->num_pages; i++) { |
779 | struct page *page = req->pages[i]; | |
780 | if (!req->out.h.error) | |
781 | SetPageUptodate(page); | |
c1aa96a5 MS |
782 | else |
783 | SetPageError(page); | |
db50b96c | 784 | unlock_page(page); |
b5dd3285 | 785 | page_cache_release(page); |
db50b96c | 786 | } |
c756e0a4 | 787 | if (req->ff) |
5a18ec17 | 788 | fuse_file_put(req->ff, false); |
c1aa96a5 MS |
789 | } |
790 | ||
2106cb18 | 791 | static void fuse_send_readpages(struct fuse_req *req, struct file *file) |
c1aa96a5 | 792 | { |
2106cb18 MS |
793 | struct fuse_file *ff = file->private_data; |
794 | struct fuse_conn *fc = ff->fc; | |
c1aa96a5 MS |
795 | loff_t pos = page_offset(req->pages[0]); |
796 | size_t count = req->num_pages << PAGE_CACHE_SHIFT; | |
f4975c67 MS |
797 | |
798 | req->out.argpages = 1; | |
c1aa96a5 | 799 | req->out.page_zeroing = 1; |
ce534fb0 | 800 | req->out.page_replace = 1; |
2106cb18 | 801 | fuse_read_fill(req, file, pos, count, FUSE_READ); |
5c5c5e51 | 802 | req->misc.read.attr_ver = fuse_get_attr_version(fc); |
9cd68455 | 803 | if (fc->async_read) { |
c756e0a4 | 804 | req->ff = fuse_file_get(ff); |
9cd68455 | 805 | req->end = fuse_readpages_end; |
b93f858a | 806 | fuse_request_send_background(fc, req); |
9cd68455 | 807 | } else { |
b93f858a | 808 | fuse_request_send(fc, req); |
9cd68455 | 809 | fuse_readpages_end(fc, req); |
e9bb09dd | 810 | fuse_put_request(fc, req); |
9cd68455 | 811 | } |
db50b96c MS |
812 | } |
813 | ||
c756e0a4 | 814 | struct fuse_fill_data { |
db50b96c | 815 | struct fuse_req *req; |
a6643094 | 816 | struct file *file; |
db50b96c | 817 | struct inode *inode; |
f8dbdf81 | 818 | unsigned nr_pages; |
db50b96c MS |
819 | }; |
820 | ||
821 | static int fuse_readpages_fill(void *_data, struct page *page) | |
822 | { | |
c756e0a4 | 823 | struct fuse_fill_data *data = _data; |
db50b96c MS |
824 | struct fuse_req *req = data->req; |
825 | struct inode *inode = data->inode; | |
826 | struct fuse_conn *fc = get_fuse_conn(inode); | |
827 | ||
3be5a52b MS |
828 | fuse_wait_on_page_writeback(inode, page->index); |
829 | ||
db50b96c MS |
830 | if (req->num_pages && |
831 | (req->num_pages == FUSE_MAX_PAGES_PER_REQ || | |
832 | (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read || | |
833 | req->pages[req->num_pages - 1]->index + 1 != page->index)) { | |
f8dbdf81 MP |
834 | int nr_alloc = min_t(unsigned, data->nr_pages, |
835 | FUSE_MAX_PAGES_PER_REQ); | |
2106cb18 | 836 | fuse_send_readpages(req, data->file); |
8b41e671 MP |
837 | if (fc->async_read) |
838 | req = fuse_get_req_for_background(fc, nr_alloc); | |
839 | else | |
840 | req = fuse_get_req(fc, nr_alloc); | |
841 | ||
842 | data->req = req; | |
ce1d5a49 | 843 | if (IS_ERR(req)) { |
db50b96c | 844 | unlock_page(page); |
ce1d5a49 | 845 | return PTR_ERR(req); |
db50b96c | 846 | } |
db50b96c | 847 | } |
f8dbdf81 MP |
848 | |
849 | if (WARN_ON(req->num_pages >= req->max_pages)) { | |
850 | fuse_put_request(fc, req); | |
851 | return -EIO; | |
852 | } | |
853 | ||
b5dd3285 | 854 | page_cache_get(page); |
db50b96c | 855 | req->pages[req->num_pages] = page; |
85f40aec | 856 | req->page_descs[req->num_pages].length = PAGE_SIZE; |
1729a16c | 857 | req->num_pages++; |
f8dbdf81 | 858 | data->nr_pages--; |
db50b96c MS |
859 | return 0; |
860 | } | |
861 | ||
862 | static int fuse_readpages(struct file *file, struct address_space *mapping, | |
863 | struct list_head *pages, unsigned nr_pages) | |
864 | { | |
865 | struct inode *inode = mapping->host; | |
866 | struct fuse_conn *fc = get_fuse_conn(inode); | |
c756e0a4 | 867 | struct fuse_fill_data data; |
db50b96c | 868 | int err; |
f8dbdf81 | 869 | int nr_alloc = min_t(unsigned, nr_pages, FUSE_MAX_PAGES_PER_REQ); |
248d86e8 | 870 | |
1d7ea732 | 871 | err = -EIO; |
248d86e8 | 872 | if (is_bad_inode(inode)) |
2e990021 | 873 | goto out; |
248d86e8 | 874 | |
a6643094 | 875 | data.file = file; |
db50b96c | 876 | data.inode = inode; |
8b41e671 MP |
877 | if (fc->async_read) |
878 | data.req = fuse_get_req_for_background(fc, nr_alloc); | |
879 | else | |
880 | data.req = fuse_get_req(fc, nr_alloc); | |
f8dbdf81 | 881 | data.nr_pages = nr_pages; |
1d7ea732 | 882 | err = PTR_ERR(data.req); |
ce1d5a49 | 883 | if (IS_ERR(data.req)) |
2e990021 | 884 | goto out; |
db50b96c MS |
885 | |
886 | err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); | |
d3406ffa MS |
887 | if (!err) { |
888 | if (data.req->num_pages) | |
2106cb18 | 889 | fuse_send_readpages(data.req, file); |
d3406ffa MS |
890 | else |
891 | fuse_put_request(fc, data.req); | |
892 | } | |
2e990021 | 893 | out: |
1d7ea732 | 894 | return err; |
db50b96c MS |
895 | } |
896 | ||
37c20f16 | 897 | static ssize_t fuse_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
bcb4be80 MS |
898 | { |
899 | struct inode *inode = iocb->ki_filp->f_mapping->host; | |
a8894274 | 900 | struct fuse_conn *fc = get_fuse_conn(inode); |
bcb4be80 | 901 | |
a8894274 BF |
902 | /* |
903 | * In auto invalidate mode, always update attributes on read. | |
904 | * Otherwise, only update if we attempt to read past EOF (to ensure | |
905 | * i_size is up to date). | |
906 | */ | |
907 | if (fc->auto_inval_data || | |
37c20f16 | 908 | (iocb->ki_pos + iov_iter_count(to) > i_size_read(inode))) { |
bcb4be80 | 909 | int err; |
bcb4be80 MS |
910 | err = fuse_update_attributes(inode, NULL, iocb->ki_filp, NULL); |
911 | if (err) | |
912 | return err; | |
913 | } | |
914 | ||
37c20f16 | 915 | return generic_file_read_iter(iocb, to); |
bcb4be80 MS |
916 | } |
917 | ||
2d698b07 | 918 | static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff, |
2106cb18 | 919 | loff_t pos, size_t count) |
b6aeaded | 920 | { |
b25e82e5 MS |
921 | struct fuse_write_in *inarg = &req->misc.write.in; |
922 | struct fuse_write_out *outarg = &req->misc.write.out; | |
b6aeaded | 923 | |
b25e82e5 MS |
924 | inarg->fh = ff->fh; |
925 | inarg->offset = pos; | |
926 | inarg->size = count; | |
b6aeaded | 927 | req->in.h.opcode = FUSE_WRITE; |
2106cb18 | 928 | req->in.h.nodeid = ff->nodeid; |
b6aeaded | 929 | req->in.numargs = 2; |
2106cb18 | 930 | if (ff->fc->minor < 9) |
f3332114 MS |
931 | req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE; |
932 | else | |
933 | req->in.args[0].size = sizeof(struct fuse_write_in); | |
b25e82e5 | 934 | req->in.args[0].value = inarg; |
b6aeaded MS |
935 | req->in.args[1].size = count; |
936 | req->out.numargs = 1; | |
937 | req->out.args[0].size = sizeof(struct fuse_write_out); | |
b25e82e5 MS |
938 | req->out.args[0].value = outarg; |
939 | } | |
940 | ||
36cf66ed | 941 | static size_t fuse_send_write(struct fuse_req *req, struct fuse_io_priv *io, |
2106cb18 | 942 | loff_t pos, size_t count, fl_owner_t owner) |
b25e82e5 | 943 | { |
36cf66ed | 944 | struct file *file = io->file; |
2106cb18 MS |
945 | struct fuse_file *ff = file->private_data; |
946 | struct fuse_conn *fc = ff->fc; | |
2d698b07 MS |
947 | struct fuse_write_in *inarg = &req->misc.write.in; |
948 | ||
2106cb18 | 949 | fuse_write_fill(req, ff, pos, count); |
2d698b07 | 950 | inarg->flags = file->f_flags; |
f3332114 | 951 | if (owner != NULL) { |
f3332114 MS |
952 | inarg->write_flags |= FUSE_WRITE_LOCKOWNER; |
953 | inarg->lock_owner = fuse_lock_owner_id(fc, owner); | |
954 | } | |
36cf66ed MP |
955 | |
956 | if (io->async) | |
957 | return fuse_async_req_send(fc, req, count, io); | |
958 | ||
b93f858a | 959 | fuse_request_send(fc, req); |
b25e82e5 | 960 | return req->misc.write.out.size; |
b6aeaded MS |
961 | } |
962 | ||
b0aa7606 | 963 | bool fuse_write_update_size(struct inode *inode, loff_t pos) |
854512ec MS |
964 | { |
965 | struct fuse_conn *fc = get_fuse_conn(inode); | |
966 | struct fuse_inode *fi = get_fuse_inode(inode); | |
b0aa7606 | 967 | bool ret = false; |
854512ec MS |
968 | |
969 | spin_lock(&fc->lock); | |
970 | fi->attr_version = ++fc->attr_version; | |
b0aa7606 | 971 | if (pos > inode->i_size) { |
854512ec | 972 | i_size_write(inode, pos); |
b0aa7606 MP |
973 | ret = true; |
974 | } | |
854512ec | 975 | spin_unlock(&fc->lock); |
b0aa7606 MP |
976 | |
977 | return ret; | |
854512ec MS |
978 | } |
979 | ||
ea9b9907 NP |
980 | static size_t fuse_send_write_pages(struct fuse_req *req, struct file *file, |
981 | struct inode *inode, loff_t pos, | |
982 | size_t count) | |
983 | { | |
984 | size_t res; | |
985 | unsigned offset; | |
986 | unsigned i; | |
36cf66ed | 987 | struct fuse_io_priv io = { .async = 0, .file = file }; |
ea9b9907 NP |
988 | |
989 | for (i = 0; i < req->num_pages; i++) | |
990 | fuse_wait_on_page_writeback(inode, req->pages[i]->index); | |
991 | ||
36cf66ed | 992 | res = fuse_send_write(req, &io, pos, count, NULL); |
ea9b9907 | 993 | |
b2430d75 | 994 | offset = req->page_descs[0].offset; |
ea9b9907 NP |
995 | count = res; |
996 | for (i = 0; i < req->num_pages; i++) { | |
997 | struct page *page = req->pages[i]; | |
998 | ||
999 | if (!req->out.h.error && !offset && count >= PAGE_CACHE_SIZE) | |
1000 | SetPageUptodate(page); | |
1001 | ||
1002 | if (count > PAGE_CACHE_SIZE - offset) | |
1003 | count -= PAGE_CACHE_SIZE - offset; | |
1004 | else | |
1005 | count = 0; | |
1006 | offset = 0; | |
1007 | ||
1008 | unlock_page(page); | |
1009 | page_cache_release(page); | |
1010 | } | |
1011 | ||
1012 | return res; | |
1013 | } | |
1014 | ||
1015 | static ssize_t fuse_fill_write_pages(struct fuse_req *req, | |
1016 | struct address_space *mapping, | |
1017 | struct iov_iter *ii, loff_t pos) | |
1018 | { | |
1019 | struct fuse_conn *fc = get_fuse_conn(mapping->host); | |
1020 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1021 | size_t count = 0; | |
1022 | int err; | |
1023 | ||
f4975c67 | 1024 | req->in.argpages = 1; |
b2430d75 | 1025 | req->page_descs[0].offset = offset; |
ea9b9907 NP |
1026 | |
1027 | do { | |
1028 | size_t tmp; | |
1029 | struct page *page; | |
1030 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; | |
1031 | size_t bytes = min_t(size_t, PAGE_CACHE_SIZE - offset, | |
1032 | iov_iter_count(ii)); | |
1033 | ||
1034 | bytes = min_t(size_t, bytes, fc->max_write - count); | |
1035 | ||
1036 | again: | |
1037 | err = -EFAULT; | |
1038 | if (iov_iter_fault_in_readable(ii, bytes)) | |
1039 | break; | |
1040 | ||
1041 | err = -ENOMEM; | |
54566b2c | 1042 | page = grab_cache_page_write_begin(mapping, index, 0); |
ea9b9907 NP |
1043 | if (!page) |
1044 | break; | |
1045 | ||
931e80e4 | 1046 | if (mapping_writably_mapped(mapping)) |
1047 | flush_dcache_page(page); | |
1048 | ||
ea9b9907 | 1049 | tmp = iov_iter_copy_from_user_atomic(page, ii, offset, bytes); |
ea9b9907 NP |
1050 | flush_dcache_page(page); |
1051 | ||
1052 | if (!tmp) { | |
1053 | unlock_page(page); | |
1054 | page_cache_release(page); | |
1055 | bytes = min(bytes, iov_iter_single_seg_count(ii)); | |
1056 | goto again; | |
1057 | } | |
1058 | ||
1059 | err = 0; | |
1060 | req->pages[req->num_pages] = page; | |
85f40aec | 1061 | req->page_descs[req->num_pages].length = tmp; |
ea9b9907 NP |
1062 | req->num_pages++; |
1063 | ||
1064 | iov_iter_advance(ii, tmp); | |
1065 | count += tmp; | |
1066 | pos += tmp; | |
1067 | offset += tmp; | |
1068 | if (offset == PAGE_CACHE_SIZE) | |
1069 | offset = 0; | |
1070 | ||
78bb6cb9 MS |
1071 | if (!fc->big_writes) |
1072 | break; | |
ea9b9907 | 1073 | } while (iov_iter_count(ii) && count < fc->max_write && |
d07f09f5 | 1074 | req->num_pages < req->max_pages && offset == 0); |
ea9b9907 NP |
1075 | |
1076 | return count > 0 ? count : err; | |
1077 | } | |
1078 | ||
d07f09f5 MP |
1079 | static inline unsigned fuse_wr_pages(loff_t pos, size_t len) |
1080 | { | |
1081 | return min_t(unsigned, | |
1082 | ((pos + len - 1) >> PAGE_CACHE_SHIFT) - | |
1083 | (pos >> PAGE_CACHE_SHIFT) + 1, | |
1084 | FUSE_MAX_PAGES_PER_REQ); | |
1085 | } | |
1086 | ||
ea9b9907 NP |
1087 | static ssize_t fuse_perform_write(struct file *file, |
1088 | struct address_space *mapping, | |
1089 | struct iov_iter *ii, loff_t pos) | |
1090 | { | |
1091 | struct inode *inode = mapping->host; | |
1092 | struct fuse_conn *fc = get_fuse_conn(inode); | |
06a7c3c2 | 1093 | struct fuse_inode *fi = get_fuse_inode(inode); |
ea9b9907 NP |
1094 | int err = 0; |
1095 | ssize_t res = 0; | |
1096 | ||
1097 | if (is_bad_inode(inode)) | |
1098 | return -EIO; | |
1099 | ||
06a7c3c2 MP |
1100 | if (inode->i_size < pos + iov_iter_count(ii)) |
1101 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); | |
1102 | ||
ea9b9907 NP |
1103 | do { |
1104 | struct fuse_req *req; | |
1105 | ssize_t count; | |
d07f09f5 | 1106 | unsigned nr_pages = fuse_wr_pages(pos, iov_iter_count(ii)); |
ea9b9907 | 1107 | |
d07f09f5 | 1108 | req = fuse_get_req(fc, nr_pages); |
ea9b9907 NP |
1109 | if (IS_ERR(req)) { |
1110 | err = PTR_ERR(req); | |
1111 | break; | |
1112 | } | |
1113 | ||
1114 | count = fuse_fill_write_pages(req, mapping, ii, pos); | |
1115 | if (count <= 0) { | |
1116 | err = count; | |
1117 | } else { | |
1118 | size_t num_written; | |
1119 | ||
1120 | num_written = fuse_send_write_pages(req, file, inode, | |
1121 | pos, count); | |
1122 | err = req->out.h.error; | |
1123 | if (!err) { | |
1124 | res += num_written; | |
1125 | pos += num_written; | |
1126 | ||
1127 | /* break out of the loop on short write */ | |
1128 | if (num_written != count) | |
1129 | err = -EIO; | |
1130 | } | |
1131 | } | |
1132 | fuse_put_request(fc, req); | |
1133 | } while (!err && iov_iter_count(ii)); | |
1134 | ||
1135 | if (res > 0) | |
1136 | fuse_write_update_size(inode, pos); | |
1137 | ||
06a7c3c2 | 1138 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); |
ea9b9907 NP |
1139 | fuse_invalidate_attr(inode); |
1140 | ||
1141 | return res > 0 ? res : err; | |
1142 | } | |
1143 | ||
84c3d55c | 1144 | static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
ea9b9907 NP |
1145 | { |
1146 | struct file *file = iocb->ki_filp; | |
1147 | struct address_space *mapping = file->f_mapping; | |
ea9b9907 | 1148 | ssize_t written = 0; |
4273b793 | 1149 | ssize_t written_buffered = 0; |
ea9b9907 NP |
1150 | struct inode *inode = mapping->host; |
1151 | ssize_t err; | |
4273b793 | 1152 | loff_t endbyte = 0; |
ea9b9907 | 1153 | |
4d99ff8f PE |
1154 | if (get_fuse_conn(inode)->writeback_cache) { |
1155 | /* Update size (EOF optimization) and mode (SUID clearing) */ | |
1156 | err = fuse_update_attributes(mapping->host, NULL, file, NULL); | |
1157 | if (err) | |
1158 | return err; | |
1159 | ||
84c3d55c | 1160 | return generic_file_write_iter(iocb, from); |
4d99ff8f PE |
1161 | } |
1162 | ||
ea9b9907 | 1163 | mutex_lock(&inode->i_mutex); |
ea9b9907 NP |
1164 | |
1165 | /* We can write back this queue in page reclaim */ | |
de1414a6 | 1166 | current->backing_dev_info = inode_to_bdi(inode); |
ea9b9907 | 1167 | |
3309dd04 AV |
1168 | err = generic_write_checks(iocb, from); |
1169 | if (err <= 0) | |
ea9b9907 NP |
1170 | goto out; |
1171 | ||
2f1936b8 | 1172 | err = file_remove_suid(file); |
ea9b9907 NP |
1173 | if (err) |
1174 | goto out; | |
1175 | ||
c3b2da31 JB |
1176 | err = file_update_time(file); |
1177 | if (err) | |
1178 | goto out; | |
ea9b9907 | 1179 | |
2ba48ce5 | 1180 | if (iocb->ki_flags & IOCB_DIRECT) { |
3309dd04 | 1181 | loff_t pos = iocb->ki_pos; |
84c3d55c AV |
1182 | written = generic_file_direct_write(iocb, from, pos); |
1183 | if (written < 0 || !iov_iter_count(from)) | |
4273b793 AA |
1184 | goto out; |
1185 | ||
1186 | pos += written; | |
ea9b9907 | 1187 | |
84c3d55c | 1188 | written_buffered = fuse_perform_write(file, mapping, from, pos); |
4273b793 AA |
1189 | if (written_buffered < 0) { |
1190 | err = written_buffered; | |
1191 | goto out; | |
1192 | } | |
1193 | endbyte = pos + written_buffered - 1; | |
1194 | ||
1195 | err = filemap_write_and_wait_range(file->f_mapping, pos, | |
1196 | endbyte); | |
1197 | if (err) | |
1198 | goto out; | |
1199 | ||
1200 | invalidate_mapping_pages(file->f_mapping, | |
1201 | pos >> PAGE_CACHE_SHIFT, | |
1202 | endbyte >> PAGE_CACHE_SHIFT); | |
1203 | ||
1204 | written += written_buffered; | |
1205 | iocb->ki_pos = pos + written_buffered; | |
1206 | } else { | |
3309dd04 | 1207 | written = fuse_perform_write(file, mapping, from, iocb->ki_pos); |
4273b793 | 1208 | if (written >= 0) |
3309dd04 | 1209 | iocb->ki_pos += written; |
4273b793 | 1210 | } |
ea9b9907 NP |
1211 | out: |
1212 | current->backing_dev_info = NULL; | |
1213 | mutex_unlock(&inode->i_mutex); | |
1214 | ||
1215 | return written ? written : err; | |
1216 | } | |
1217 | ||
7c190c8b MP |
1218 | static inline void fuse_page_descs_length_init(struct fuse_req *req, |
1219 | unsigned index, unsigned nr_pages) | |
85f40aec MP |
1220 | { |
1221 | int i; | |
1222 | ||
7c190c8b | 1223 | for (i = index; i < index + nr_pages; i++) |
85f40aec MP |
1224 | req->page_descs[i].length = PAGE_SIZE - |
1225 | req->page_descs[i].offset; | |
1226 | } | |
1227 | ||
7c190c8b MP |
1228 | static inline unsigned long fuse_get_user_addr(const struct iov_iter *ii) |
1229 | { | |
1230 | return (unsigned long)ii->iov->iov_base + ii->iov_offset; | |
1231 | } | |
1232 | ||
1233 | static inline size_t fuse_get_frag_size(const struct iov_iter *ii, | |
1234 | size_t max_size) | |
1235 | { | |
1236 | return min(iov_iter_single_seg_count(ii), max_size); | |
1237 | } | |
1238 | ||
b98d023a | 1239 | static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii, |
ce60a2f1 | 1240 | size_t *nbytesp, int write) |
413ef8cb | 1241 | { |
7c190c8b | 1242 | size_t nbytes = 0; /* # bytes already packed in req */ |
b98d023a | 1243 | |
f4975c67 | 1244 | /* Special case for kernel I/O: can copy directly into the buffer */ |
62a8067a | 1245 | if (ii->type & ITER_KVEC) { |
7c190c8b MP |
1246 | unsigned long user_addr = fuse_get_user_addr(ii); |
1247 | size_t frag_size = fuse_get_frag_size(ii, *nbytesp); | |
1248 | ||
f4975c67 MS |
1249 | if (write) |
1250 | req->in.args[1].value = (void *) user_addr; | |
1251 | else | |
1252 | req->out.args[0].value = (void *) user_addr; | |
1253 | ||
b98d023a MP |
1254 | iov_iter_advance(ii, frag_size); |
1255 | *nbytesp = frag_size; | |
f4975c67 MS |
1256 | return 0; |
1257 | } | |
413ef8cb | 1258 | |
5565a9d8 | 1259 | while (nbytes < *nbytesp && req->num_pages < req->max_pages) { |
7c190c8b | 1260 | unsigned npages; |
f67da30c | 1261 | size_t start; |
c9c37e2e AV |
1262 | ssize_t ret = iov_iter_get_pages(ii, |
1263 | &req->pages[req->num_pages], | |
2c80929c | 1264 | *nbytesp - nbytes, |
c7f3888a AV |
1265 | req->max_pages - req->num_pages, |
1266 | &start); | |
7c190c8b MP |
1267 | if (ret < 0) |
1268 | return ret; | |
1269 | ||
c9c37e2e AV |
1270 | iov_iter_advance(ii, ret); |
1271 | nbytes += ret; | |
7c190c8b | 1272 | |
c9c37e2e AV |
1273 | ret += start; |
1274 | npages = (ret + PAGE_SIZE - 1) / PAGE_SIZE; | |
7c190c8b | 1275 | |
c9c37e2e | 1276 | req->page_descs[req->num_pages].offset = start; |
7c190c8b MP |
1277 | fuse_page_descs_length_init(req, req->num_pages, npages); |
1278 | ||
1279 | req->num_pages += npages; | |
1280 | req->page_descs[req->num_pages - 1].length -= | |
c9c37e2e | 1281 | (PAGE_SIZE - ret) & (PAGE_SIZE - 1); |
7c190c8b | 1282 | } |
f4975c67 MS |
1283 | |
1284 | if (write) | |
1285 | req->in.argpages = 1; | |
1286 | else | |
1287 | req->out.argpages = 1; | |
1288 | ||
7c190c8b | 1289 | *nbytesp = nbytes; |
f4975c67 | 1290 | |
413ef8cb MS |
1291 | return 0; |
1292 | } | |
1293 | ||
5565a9d8 MP |
1294 | static inline int fuse_iter_npages(const struct iov_iter *ii_p) |
1295 | { | |
f67da30c | 1296 | return iov_iter_npages(ii_p, FUSE_MAX_PAGES_PER_REQ); |
5565a9d8 MP |
1297 | } |
1298 | ||
d22a943f AV |
1299 | ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter, |
1300 | loff_t *ppos, int flags) | |
413ef8cb | 1301 | { |
ea8cd333 PE |
1302 | int write = flags & FUSE_DIO_WRITE; |
1303 | int cuse = flags & FUSE_DIO_CUSE; | |
36cf66ed | 1304 | struct file *file = io->file; |
ea8cd333 | 1305 | struct inode *inode = file->f_mapping->host; |
2106cb18 MS |
1306 | struct fuse_file *ff = file->private_data; |
1307 | struct fuse_conn *fc = ff->fc; | |
413ef8cb MS |
1308 | size_t nmax = write ? fc->max_write : fc->max_read; |
1309 | loff_t pos = *ppos; | |
d22a943f | 1310 | size_t count = iov_iter_count(iter); |
ea8cd333 PE |
1311 | pgoff_t idx_from = pos >> PAGE_CACHE_SHIFT; |
1312 | pgoff_t idx_to = (pos + count - 1) >> PAGE_CACHE_SHIFT; | |
413ef8cb | 1313 | ssize_t res = 0; |
248d86e8 MS |
1314 | struct fuse_req *req; |
1315 | ||
de82b923 | 1316 | if (io->async) |
d22a943f | 1317 | req = fuse_get_req_for_background(fc, fuse_iter_npages(iter)); |
de82b923 | 1318 | else |
d22a943f | 1319 | req = fuse_get_req(fc, fuse_iter_npages(iter)); |
ce1d5a49 MS |
1320 | if (IS_ERR(req)) |
1321 | return PTR_ERR(req); | |
413ef8cb | 1322 | |
ea8cd333 PE |
1323 | if (!cuse && fuse_range_is_writeback(inode, idx_from, idx_to)) { |
1324 | if (!write) | |
1325 | mutex_lock(&inode->i_mutex); | |
1326 | fuse_sync_writes(inode); | |
1327 | if (!write) | |
1328 | mutex_unlock(&inode->i_mutex); | |
1329 | } | |
1330 | ||
413ef8cb | 1331 | while (count) { |
413ef8cb | 1332 | size_t nres; |
2106cb18 | 1333 | fl_owner_t owner = current->files; |
f4975c67 | 1334 | size_t nbytes = min(count, nmax); |
d22a943f | 1335 | int err = fuse_get_user_pages(req, iter, &nbytes, write); |
413ef8cb MS |
1336 | if (err) { |
1337 | res = err; | |
1338 | break; | |
1339 | } | |
f4975c67 | 1340 | |
413ef8cb | 1341 | if (write) |
36cf66ed | 1342 | nres = fuse_send_write(req, io, pos, nbytes, owner); |
413ef8cb | 1343 | else |
36cf66ed | 1344 | nres = fuse_send_read(req, io, pos, nbytes, owner); |
2106cb18 | 1345 | |
36cf66ed MP |
1346 | if (!io->async) |
1347 | fuse_release_user_pages(req, !write); | |
413ef8cb MS |
1348 | if (req->out.h.error) { |
1349 | if (!res) | |
1350 | res = req->out.h.error; | |
1351 | break; | |
1352 | } else if (nres > nbytes) { | |
1353 | res = -EIO; | |
1354 | break; | |
1355 | } | |
1356 | count -= nres; | |
1357 | res += nres; | |
1358 | pos += nres; | |
413ef8cb MS |
1359 | if (nres != nbytes) |
1360 | break; | |
56cf34ff MS |
1361 | if (count) { |
1362 | fuse_put_request(fc, req); | |
de82b923 BF |
1363 | if (io->async) |
1364 | req = fuse_get_req_for_background(fc, | |
d22a943f | 1365 | fuse_iter_npages(iter)); |
de82b923 | 1366 | else |
d22a943f | 1367 | req = fuse_get_req(fc, fuse_iter_npages(iter)); |
56cf34ff MS |
1368 | if (IS_ERR(req)) |
1369 | break; | |
1370 | } | |
413ef8cb | 1371 | } |
f60311d5 AA |
1372 | if (!IS_ERR(req)) |
1373 | fuse_put_request(fc, req); | |
d09cb9d7 | 1374 | if (res > 0) |
413ef8cb | 1375 | *ppos = pos; |
413ef8cb MS |
1376 | |
1377 | return res; | |
1378 | } | |
08cbf542 | 1379 | EXPORT_SYMBOL_GPL(fuse_direct_io); |
413ef8cb | 1380 | |
36cf66ed | 1381 | static ssize_t __fuse_direct_read(struct fuse_io_priv *io, |
d22a943f AV |
1382 | struct iov_iter *iter, |
1383 | loff_t *ppos) | |
413ef8cb | 1384 | { |
d09cb9d7 | 1385 | ssize_t res; |
36cf66ed | 1386 | struct file *file = io->file; |
6131ffaa | 1387 | struct inode *inode = file_inode(file); |
d09cb9d7 MS |
1388 | |
1389 | if (is_bad_inode(inode)) | |
1390 | return -EIO; | |
1391 | ||
d22a943f | 1392 | res = fuse_direct_io(io, iter, ppos, 0); |
d09cb9d7 MS |
1393 | |
1394 | fuse_invalidate_attr(inode); | |
1395 | ||
1396 | return res; | |
413ef8cb MS |
1397 | } |
1398 | ||
15316263 | 1399 | static ssize_t fuse_direct_read_iter(struct kiocb *iocb, struct iov_iter *to) |
b98d023a | 1400 | { |
15316263 AV |
1401 | struct fuse_io_priv io = { .async = 0, .file = iocb->ki_filp }; |
1402 | return __fuse_direct_read(&io, to, &iocb->ki_pos); | |
b98d023a MP |
1403 | } |
1404 | ||
15316263 | 1405 | static ssize_t fuse_direct_write_iter(struct kiocb *iocb, struct iov_iter *from) |
4273b793 | 1406 | { |
15316263 | 1407 | struct file *file = iocb->ki_filp; |
6131ffaa | 1408 | struct inode *inode = file_inode(file); |
36cf66ed | 1409 | struct fuse_io_priv io = { .async = 0, .file = file }; |
15316263 | 1410 | ssize_t res; |
4273b793 AA |
1411 | |
1412 | if (is_bad_inode(inode)) | |
1413 | return -EIO; | |
1414 | ||
1415 | /* Don't allow parallel writes to the same file */ | |
1416 | mutex_lock(&inode->i_mutex); | |
3309dd04 AV |
1417 | res = generic_write_checks(iocb, from); |
1418 | if (res > 0) | |
812408fb | 1419 | res = fuse_direct_io(&io, from, &iocb->ki_pos, FUSE_DIO_WRITE); |
812408fb | 1420 | fuse_invalidate_attr(inode); |
bcba24cc | 1421 | if (res > 0) |
15316263 | 1422 | fuse_write_update_size(inode, iocb->ki_pos); |
4273b793 AA |
1423 | mutex_unlock(&inode->i_mutex); |
1424 | ||
1425 | return res; | |
1426 | } | |
1427 | ||
3be5a52b | 1428 | static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req) |
b6aeaded | 1429 | { |
385b1268 PE |
1430 | int i; |
1431 | ||
1432 | for (i = 0; i < req->num_pages; i++) | |
1433 | __free_page(req->pages[i]); | |
8b284dc4 MS |
1434 | |
1435 | if (req->ff) | |
1436 | fuse_file_put(req->ff, false); | |
3be5a52b MS |
1437 | } |
1438 | ||
1439 | static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req) | |
1440 | { | |
1441 | struct inode *inode = req->inode; | |
1442 | struct fuse_inode *fi = get_fuse_inode(inode); | |
de1414a6 | 1443 | struct backing_dev_info *bdi = inode_to_bdi(inode); |
385b1268 | 1444 | int i; |
3be5a52b MS |
1445 | |
1446 | list_del(&req->writepages_entry); | |
385b1268 PE |
1447 | for (i = 0; i < req->num_pages; i++) { |
1448 | dec_bdi_stat(bdi, BDI_WRITEBACK); | |
1449 | dec_zone_page_state(req->pages[i], NR_WRITEBACK_TEMP); | |
1450 | bdi_writeout_inc(bdi); | |
1451 | } | |
3be5a52b MS |
1452 | wake_up(&fi->page_waitq); |
1453 | } | |
1454 | ||
1455 | /* Called under fc->lock, may release and reacquire it */ | |
6eaf4782 MP |
1456 | static void fuse_send_writepage(struct fuse_conn *fc, struct fuse_req *req, |
1457 | loff_t size) | |
b9ca67b2 MS |
1458 | __releases(fc->lock) |
1459 | __acquires(fc->lock) | |
3be5a52b MS |
1460 | { |
1461 | struct fuse_inode *fi = get_fuse_inode(req->inode); | |
3be5a52b | 1462 | struct fuse_write_in *inarg = &req->misc.write.in; |
385b1268 | 1463 | __u64 data_size = req->num_pages * PAGE_CACHE_SIZE; |
3be5a52b MS |
1464 | |
1465 | if (!fc->connected) | |
1466 | goto out_free; | |
1467 | ||
385b1268 PE |
1468 | if (inarg->offset + data_size <= size) { |
1469 | inarg->size = data_size; | |
3be5a52b | 1470 | } else if (inarg->offset < size) { |
385b1268 | 1471 | inarg->size = size - inarg->offset; |
3be5a52b MS |
1472 | } else { |
1473 | /* Got truncated off completely */ | |
1474 | goto out_free; | |
b6aeaded | 1475 | } |
3be5a52b MS |
1476 | |
1477 | req->in.args[1].size = inarg->size; | |
1478 | fi->writectr++; | |
b93f858a | 1479 | fuse_request_send_background_locked(fc, req); |
3be5a52b MS |
1480 | return; |
1481 | ||
1482 | out_free: | |
1483 | fuse_writepage_finish(fc, req); | |
1484 | spin_unlock(&fc->lock); | |
1485 | fuse_writepage_free(fc, req); | |
e9bb09dd | 1486 | fuse_put_request(fc, req); |
3be5a52b | 1487 | spin_lock(&fc->lock); |
b6aeaded MS |
1488 | } |
1489 | ||
3be5a52b MS |
1490 | /* |
1491 | * If fi->writectr is positive (no truncate or fsync going on) send | |
1492 | * all queued writepage requests. | |
1493 | * | |
1494 | * Called with fc->lock | |
1495 | */ | |
1496 | void fuse_flush_writepages(struct inode *inode) | |
b9ca67b2 MS |
1497 | __releases(fc->lock) |
1498 | __acquires(fc->lock) | |
b6aeaded | 1499 | { |
3be5a52b MS |
1500 | struct fuse_conn *fc = get_fuse_conn(inode); |
1501 | struct fuse_inode *fi = get_fuse_inode(inode); | |
6eaf4782 | 1502 | size_t crop = i_size_read(inode); |
3be5a52b MS |
1503 | struct fuse_req *req; |
1504 | ||
1505 | while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) { | |
1506 | req = list_entry(fi->queued_writes.next, struct fuse_req, list); | |
1507 | list_del_init(&req->list); | |
6eaf4782 | 1508 | fuse_send_writepage(fc, req, crop); |
3be5a52b MS |
1509 | } |
1510 | } | |
1511 | ||
1512 | static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req) | |
1513 | { | |
1514 | struct inode *inode = req->inode; | |
1515 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1516 | ||
1517 | mapping_set_error(inode->i_mapping, req->out.h.error); | |
1518 | spin_lock(&fc->lock); | |
8b284dc4 | 1519 | while (req->misc.write.next) { |
6eaf4782 MP |
1520 | struct fuse_conn *fc = get_fuse_conn(inode); |
1521 | struct fuse_write_in *inarg = &req->misc.write.in; | |
8b284dc4 MS |
1522 | struct fuse_req *next = req->misc.write.next; |
1523 | req->misc.write.next = next->misc.write.next; | |
1524 | next->misc.write.next = NULL; | |
ce128de6 | 1525 | next->ff = fuse_file_get(req->ff); |
8b284dc4 | 1526 | list_add(&next->writepages_entry, &fi->writepages); |
6eaf4782 MP |
1527 | |
1528 | /* | |
1529 | * Skip fuse_flush_writepages() to make it easy to crop requests | |
1530 | * based on primary request size. | |
1531 | * | |
1532 | * 1st case (trivial): there are no concurrent activities using | |
1533 | * fuse_set/release_nowrite. Then we're on safe side because | |
1534 | * fuse_flush_writepages() would call fuse_send_writepage() | |
1535 | * anyway. | |
1536 | * | |
1537 | * 2nd case: someone called fuse_set_nowrite and it is waiting | |
1538 | * now for completion of all in-flight requests. This happens | |
1539 | * rarely and no more than once per page, so this should be | |
1540 | * okay. | |
1541 | * | |
1542 | * 3rd case: someone (e.g. fuse_do_setattr()) is in the middle | |
1543 | * of fuse_set_nowrite..fuse_release_nowrite section. The fact | |
1544 | * that fuse_set_nowrite returned implies that all in-flight | |
1545 | * requests were completed along with all of their secondary | |
1546 | * requests. Further primary requests are blocked by negative | |
1547 | * writectr. Hence there cannot be any in-flight requests and | |
1548 | * no invocations of fuse_writepage_end() while we're in | |
1549 | * fuse_set_nowrite..fuse_release_nowrite section. | |
1550 | */ | |
1551 | fuse_send_writepage(fc, next, inarg->offset + inarg->size); | |
8b284dc4 | 1552 | } |
3be5a52b MS |
1553 | fi->writectr--; |
1554 | fuse_writepage_finish(fc, req); | |
1555 | spin_unlock(&fc->lock); | |
1556 | fuse_writepage_free(fc, req); | |
1557 | } | |
1558 | ||
1e18bda8 MS |
1559 | static struct fuse_file *__fuse_write_file_get(struct fuse_conn *fc, |
1560 | struct fuse_inode *fi) | |
adcadfa8 | 1561 | { |
72523425 | 1562 | struct fuse_file *ff = NULL; |
adcadfa8 PE |
1563 | |
1564 | spin_lock(&fc->lock); | |
1e18bda8 | 1565 | if (!list_empty(&fi->write_files)) { |
72523425 MS |
1566 | ff = list_entry(fi->write_files.next, struct fuse_file, |
1567 | write_entry); | |
1568 | fuse_file_get(ff); | |
1569 | } | |
adcadfa8 PE |
1570 | spin_unlock(&fc->lock); |
1571 | ||
1572 | return ff; | |
1573 | } | |
1574 | ||
1e18bda8 MS |
1575 | static struct fuse_file *fuse_write_file_get(struct fuse_conn *fc, |
1576 | struct fuse_inode *fi) | |
1577 | { | |
1578 | struct fuse_file *ff = __fuse_write_file_get(fc, fi); | |
1579 | WARN_ON(!ff); | |
1580 | return ff; | |
1581 | } | |
1582 | ||
1583 | int fuse_write_inode(struct inode *inode, struct writeback_control *wbc) | |
1584 | { | |
1585 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1586 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1587 | struct fuse_file *ff; | |
1588 | int err; | |
1589 | ||
1590 | ff = __fuse_write_file_get(fc, fi); | |
ab9e13f7 | 1591 | err = fuse_flush_times(inode, ff); |
1e18bda8 MS |
1592 | if (ff) |
1593 | fuse_file_put(ff, 0); | |
1594 | ||
1595 | return err; | |
1596 | } | |
1597 | ||
3be5a52b MS |
1598 | static int fuse_writepage_locked(struct page *page) |
1599 | { | |
1600 | struct address_space *mapping = page->mapping; | |
1601 | struct inode *inode = mapping->host; | |
1602 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1603 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1604 | struct fuse_req *req; | |
3be5a52b | 1605 | struct page *tmp_page; |
72523425 | 1606 | int error = -ENOMEM; |
3be5a52b MS |
1607 | |
1608 | set_page_writeback(page); | |
1609 | ||
4250c066 | 1610 | req = fuse_request_alloc_nofs(1); |
3be5a52b MS |
1611 | if (!req) |
1612 | goto err; | |
1613 | ||
8b41e671 | 1614 | req->background = 1; /* writeback always goes to bg_queue */ |
3be5a52b MS |
1615 | tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); |
1616 | if (!tmp_page) | |
1617 | goto err_free; | |
1618 | ||
72523425 | 1619 | error = -EIO; |
26d614df | 1620 | req->ff = fuse_write_file_get(fc, fi); |
72523425 | 1621 | if (!req->ff) |
27f1b363 | 1622 | goto err_nofile; |
72523425 | 1623 | |
adcadfa8 | 1624 | fuse_write_fill(req, req->ff, page_offset(page), 0); |
3be5a52b MS |
1625 | |
1626 | copy_highpage(tmp_page, page); | |
2d698b07 | 1627 | req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; |
8b284dc4 | 1628 | req->misc.write.next = NULL; |
f4975c67 | 1629 | req->in.argpages = 1; |
3be5a52b MS |
1630 | req->num_pages = 1; |
1631 | req->pages[0] = tmp_page; | |
b2430d75 | 1632 | req->page_descs[0].offset = 0; |
85f40aec | 1633 | req->page_descs[0].length = PAGE_SIZE; |
3be5a52b MS |
1634 | req->end = fuse_writepage_end; |
1635 | req->inode = inode; | |
1636 | ||
de1414a6 | 1637 | inc_bdi_stat(inode_to_bdi(inode), BDI_WRITEBACK); |
3be5a52b | 1638 | inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP); |
3be5a52b MS |
1639 | |
1640 | spin_lock(&fc->lock); | |
1641 | list_add(&req->writepages_entry, &fi->writepages); | |
1642 | list_add_tail(&req->list, &fi->queued_writes); | |
1643 | fuse_flush_writepages(inode); | |
1644 | spin_unlock(&fc->lock); | |
1645 | ||
4a4ac4eb MP |
1646 | end_page_writeback(page); |
1647 | ||
3be5a52b MS |
1648 | return 0; |
1649 | ||
27f1b363 MP |
1650 | err_nofile: |
1651 | __free_page(tmp_page); | |
3be5a52b MS |
1652 | err_free: |
1653 | fuse_request_free(req); | |
1654 | err: | |
1655 | end_page_writeback(page); | |
72523425 | 1656 | return error; |
3be5a52b MS |
1657 | } |
1658 | ||
1659 | static int fuse_writepage(struct page *page, struct writeback_control *wbc) | |
1660 | { | |
1661 | int err; | |
1662 | ||
ff17be08 MS |
1663 | if (fuse_page_is_writeback(page->mapping->host, page->index)) { |
1664 | /* | |
1665 | * ->writepages() should be called for sync() and friends. We | |
1666 | * should only get here on direct reclaim and then we are | |
1667 | * allowed to skip a page which is already in flight | |
1668 | */ | |
1669 | WARN_ON(wbc->sync_mode == WB_SYNC_ALL); | |
1670 | ||
1671 | redirty_page_for_writepage(wbc, page); | |
1672 | return 0; | |
1673 | } | |
1674 | ||
3be5a52b MS |
1675 | err = fuse_writepage_locked(page); |
1676 | unlock_page(page); | |
1677 | ||
1678 | return err; | |
1679 | } | |
1680 | ||
26d614df PE |
1681 | struct fuse_fill_wb_data { |
1682 | struct fuse_req *req; | |
1683 | struct fuse_file *ff; | |
1684 | struct inode *inode; | |
2d033eaa | 1685 | struct page **orig_pages; |
26d614df PE |
1686 | }; |
1687 | ||
1688 | static void fuse_writepages_send(struct fuse_fill_wb_data *data) | |
1689 | { | |
1690 | struct fuse_req *req = data->req; | |
1691 | struct inode *inode = data->inode; | |
1692 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1693 | struct fuse_inode *fi = get_fuse_inode(inode); | |
2d033eaa MP |
1694 | int num_pages = req->num_pages; |
1695 | int i; | |
26d614df PE |
1696 | |
1697 | req->ff = fuse_file_get(data->ff); | |
1698 | spin_lock(&fc->lock); | |
1699 | list_add_tail(&req->list, &fi->queued_writes); | |
1700 | fuse_flush_writepages(inode); | |
1701 | spin_unlock(&fc->lock); | |
2d033eaa MP |
1702 | |
1703 | for (i = 0; i < num_pages; i++) | |
1704 | end_page_writeback(data->orig_pages[i]); | |
26d614df PE |
1705 | } |
1706 | ||
8b284dc4 MS |
1707 | static bool fuse_writepage_in_flight(struct fuse_req *new_req, |
1708 | struct page *page) | |
1709 | { | |
1710 | struct fuse_conn *fc = get_fuse_conn(new_req->inode); | |
1711 | struct fuse_inode *fi = get_fuse_inode(new_req->inode); | |
1712 | struct fuse_req *tmp; | |
1713 | struct fuse_req *old_req; | |
1714 | bool found = false; | |
1715 | pgoff_t curr_index; | |
1716 | ||
1717 | BUG_ON(new_req->num_pages != 0); | |
1718 | ||
1719 | spin_lock(&fc->lock); | |
1720 | list_del(&new_req->writepages_entry); | |
8b284dc4 MS |
1721 | list_for_each_entry(old_req, &fi->writepages, writepages_entry) { |
1722 | BUG_ON(old_req->inode != new_req->inode); | |
1723 | curr_index = old_req->misc.write.in.offset >> PAGE_CACHE_SHIFT; | |
1724 | if (curr_index <= page->index && | |
1725 | page->index < curr_index + old_req->num_pages) { | |
1726 | found = true; | |
1727 | break; | |
1728 | } | |
1729 | } | |
f6011081 MP |
1730 | if (!found) { |
1731 | list_add(&new_req->writepages_entry, &fi->writepages); | |
8b284dc4 | 1732 | goto out_unlock; |
f6011081 | 1733 | } |
8b284dc4 | 1734 | |
f6011081 | 1735 | new_req->num_pages = 1; |
8b284dc4 MS |
1736 | for (tmp = old_req; tmp != NULL; tmp = tmp->misc.write.next) { |
1737 | BUG_ON(tmp->inode != new_req->inode); | |
1738 | curr_index = tmp->misc.write.in.offset >> PAGE_CACHE_SHIFT; | |
1739 | if (tmp->num_pages == 1 && | |
1740 | curr_index == page->index) { | |
1741 | old_req = tmp; | |
1742 | } | |
1743 | } | |
1744 | ||
1745 | if (old_req->num_pages == 1 && (old_req->state == FUSE_REQ_INIT || | |
1746 | old_req->state == FUSE_REQ_PENDING)) { | |
de1414a6 | 1747 | struct backing_dev_info *bdi = inode_to_bdi(page->mapping->host); |
41b6e41f | 1748 | |
8b284dc4 MS |
1749 | copy_highpage(old_req->pages[0], page); |
1750 | spin_unlock(&fc->lock); | |
1751 | ||
41b6e41f | 1752 | dec_bdi_stat(bdi, BDI_WRITEBACK); |
8b284dc4 | 1753 | dec_zone_page_state(page, NR_WRITEBACK_TEMP); |
41b6e41f | 1754 | bdi_writeout_inc(bdi); |
8b284dc4 MS |
1755 | fuse_writepage_free(fc, new_req); |
1756 | fuse_request_free(new_req); | |
1757 | goto out; | |
1758 | } else { | |
1759 | new_req->misc.write.next = old_req->misc.write.next; | |
1760 | old_req->misc.write.next = new_req; | |
1761 | } | |
1762 | out_unlock: | |
1763 | spin_unlock(&fc->lock); | |
1764 | out: | |
1765 | return found; | |
1766 | } | |
1767 | ||
26d614df PE |
1768 | static int fuse_writepages_fill(struct page *page, |
1769 | struct writeback_control *wbc, void *_data) | |
1770 | { | |
1771 | struct fuse_fill_wb_data *data = _data; | |
1772 | struct fuse_req *req = data->req; | |
1773 | struct inode *inode = data->inode; | |
1774 | struct fuse_conn *fc = get_fuse_conn(inode); | |
1775 | struct page *tmp_page; | |
8b284dc4 | 1776 | bool is_writeback; |
26d614df PE |
1777 | int err; |
1778 | ||
1779 | if (!data->ff) { | |
1780 | err = -EIO; | |
1781 | data->ff = fuse_write_file_get(fc, get_fuse_inode(inode)); | |
1782 | if (!data->ff) | |
1783 | goto out_unlock; | |
1784 | } | |
1785 | ||
8b284dc4 MS |
1786 | /* |
1787 | * Being under writeback is unlikely but possible. For example direct | |
1788 | * read to an mmaped fuse file will set the page dirty twice; once when | |
1789 | * the pages are faulted with get_user_pages(), and then after the read | |
1790 | * completed. | |
1791 | */ | |
1792 | is_writeback = fuse_page_is_writeback(inode, page->index); | |
1793 | ||
1794 | if (req && req->num_pages && | |
1795 | (is_writeback || req->num_pages == FUSE_MAX_PAGES_PER_REQ || | |
1796 | (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_write || | |
1797 | data->orig_pages[req->num_pages - 1]->index + 1 != page->index)) { | |
1798 | fuse_writepages_send(data); | |
1799 | data->req = NULL; | |
26d614df PE |
1800 | } |
1801 | err = -ENOMEM; | |
1802 | tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM); | |
1803 | if (!tmp_page) | |
1804 | goto out_unlock; | |
1805 | ||
1806 | /* | |
1807 | * The page must not be redirtied until the writeout is completed | |
1808 | * (i.e. userspace has sent a reply to the write request). Otherwise | |
1809 | * there could be more than one temporary page instance for each real | |
1810 | * page. | |
1811 | * | |
1812 | * This is ensured by holding the page lock in page_mkwrite() while | |
1813 | * checking fuse_page_is_writeback(). We already hold the page lock | |
1814 | * since clear_page_dirty_for_io() and keep it held until we add the | |
1815 | * request to the fi->writepages list and increment req->num_pages. | |
1816 | * After this fuse_page_is_writeback() will indicate that the page is | |
1817 | * under writeback, so we can release the page lock. | |
1818 | */ | |
1819 | if (data->req == NULL) { | |
1820 | struct fuse_inode *fi = get_fuse_inode(inode); | |
1821 | ||
1822 | err = -ENOMEM; | |
1823 | req = fuse_request_alloc_nofs(FUSE_MAX_PAGES_PER_REQ); | |
1824 | if (!req) { | |
1825 | __free_page(tmp_page); | |
1826 | goto out_unlock; | |
1827 | } | |
1828 | ||
1829 | fuse_write_fill(req, data->ff, page_offset(page), 0); | |
1830 | req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; | |
8b284dc4 | 1831 | req->misc.write.next = NULL; |
26d614df PE |
1832 | req->in.argpages = 1; |
1833 | req->background = 1; | |
1834 | req->num_pages = 0; | |
1835 | req->end = fuse_writepage_end; | |
1836 | req->inode = inode; | |
1837 | ||
1838 | spin_lock(&fc->lock); | |
1839 | list_add(&req->writepages_entry, &fi->writepages); | |
1840 | spin_unlock(&fc->lock); | |
1841 | ||
1842 | data->req = req; | |
1843 | } | |
1844 | set_page_writeback(page); | |
1845 | ||
1846 | copy_highpage(tmp_page, page); | |
1847 | req->pages[req->num_pages] = tmp_page; | |
1848 | req->page_descs[req->num_pages].offset = 0; | |
1849 | req->page_descs[req->num_pages].length = PAGE_SIZE; | |
1850 | ||
de1414a6 | 1851 | inc_bdi_stat(inode_to_bdi(inode), BDI_WRITEBACK); |
26d614df | 1852 | inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP); |
8b284dc4 MS |
1853 | |
1854 | err = 0; | |
1855 | if (is_writeback && fuse_writepage_in_flight(req, page)) { | |
1856 | end_page_writeback(page); | |
1857 | data->req = NULL; | |
1858 | goto out_unlock; | |
1859 | } | |
2d033eaa | 1860 | data->orig_pages[req->num_pages] = page; |
26d614df PE |
1861 | |
1862 | /* | |
1863 | * Protected by fc->lock against concurrent access by | |
1864 | * fuse_page_is_writeback(). | |
1865 | */ | |
1866 | spin_lock(&fc->lock); | |
1867 | req->num_pages++; | |
1868 | spin_unlock(&fc->lock); | |
1869 | ||
26d614df PE |
1870 | out_unlock: |
1871 | unlock_page(page); | |
1872 | ||
1873 | return err; | |
1874 | } | |
1875 | ||
1876 | static int fuse_writepages(struct address_space *mapping, | |
1877 | struct writeback_control *wbc) | |
1878 | { | |
1879 | struct inode *inode = mapping->host; | |
1880 | struct fuse_fill_wb_data data; | |
1881 | int err; | |
1882 | ||
1883 | err = -EIO; | |
1884 | if (is_bad_inode(inode)) | |
1885 | goto out; | |
1886 | ||
1887 | data.inode = inode; | |
1888 | data.req = NULL; | |
1889 | data.ff = NULL; | |
1890 | ||
2d033eaa | 1891 | err = -ENOMEM; |
f2b3455e FF |
1892 | data.orig_pages = kcalloc(FUSE_MAX_PAGES_PER_REQ, |
1893 | sizeof(struct page *), | |
2d033eaa MP |
1894 | GFP_NOFS); |
1895 | if (!data.orig_pages) | |
1896 | goto out; | |
1897 | ||
26d614df PE |
1898 | err = write_cache_pages(mapping, wbc, fuse_writepages_fill, &data); |
1899 | if (data.req) { | |
1900 | /* Ignore errors if we can write at least one page */ | |
1901 | BUG_ON(!data.req->num_pages); | |
1902 | fuse_writepages_send(&data); | |
1903 | err = 0; | |
1904 | } | |
1905 | if (data.ff) | |
1906 | fuse_file_put(data.ff, false); | |
2d033eaa MP |
1907 | |
1908 | kfree(data.orig_pages); | |
26d614df PE |
1909 | out: |
1910 | return err; | |
1911 | } | |
1912 | ||
6b12c1b3 PE |
1913 | /* |
1914 | * It's worthy to make sure that space is reserved on disk for the write, | |
1915 | * but how to implement it without killing performance need more thinking. | |
1916 | */ | |
1917 | static int fuse_write_begin(struct file *file, struct address_space *mapping, | |
1918 | loff_t pos, unsigned len, unsigned flags, | |
1919 | struct page **pagep, void **fsdata) | |
1920 | { | |
1921 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; | |
a455589f | 1922 | struct fuse_conn *fc = get_fuse_conn(file_inode(file)); |
6b12c1b3 PE |
1923 | struct page *page; |
1924 | loff_t fsize; | |
1925 | int err = -ENOMEM; | |
1926 | ||
1927 | WARN_ON(!fc->writeback_cache); | |
1928 | ||
1929 | page = grab_cache_page_write_begin(mapping, index, flags); | |
1930 | if (!page) | |
1931 | goto error; | |
1932 | ||
1933 | fuse_wait_on_page_writeback(mapping->host, page->index); | |
1934 | ||
1935 | if (PageUptodate(page) || len == PAGE_CACHE_SIZE) | |
1936 | goto success; | |
1937 | /* | |
1938 | * Check if the start this page comes after the end of file, in which | |
1939 | * case the readpage can be optimized away. | |
1940 | */ | |
1941 | fsize = i_size_read(mapping->host); | |
1942 | if (fsize <= (pos & PAGE_CACHE_MASK)) { | |
1943 | size_t off = pos & ~PAGE_CACHE_MASK; | |
1944 | if (off) | |
1945 | zero_user_segment(page, 0, off); | |
1946 | goto success; | |
1947 | } | |
1948 | err = fuse_do_readpage(file, page); | |
1949 | if (err) | |
1950 | goto cleanup; | |
1951 | success: | |
1952 | *pagep = page; | |
1953 | return 0; | |
1954 | ||
1955 | cleanup: | |
1956 | unlock_page(page); | |
1957 | page_cache_release(page); | |
1958 | error: | |
1959 | return err; | |
1960 | } | |
1961 | ||
1962 | static int fuse_write_end(struct file *file, struct address_space *mapping, | |
1963 | loff_t pos, unsigned len, unsigned copied, | |
1964 | struct page *page, void *fsdata) | |
1965 | { | |
1966 | struct inode *inode = page->mapping->host; | |
1967 | ||
1968 | if (!PageUptodate(page)) { | |
1969 | /* Zero any unwritten bytes at the end of the page */ | |
1970 | size_t endoff = (pos + copied) & ~PAGE_CACHE_MASK; | |
1971 | if (endoff) | |
1972 | zero_user_segment(page, endoff, PAGE_CACHE_SIZE); | |
1973 | SetPageUptodate(page); | |
1974 | } | |
1975 | ||
1976 | fuse_write_update_size(inode, pos + copied); | |
1977 | set_page_dirty(page); | |
1978 | unlock_page(page); | |
1979 | page_cache_release(page); | |
1980 | ||
1981 | return copied; | |
1982 | } | |
1983 | ||
3be5a52b MS |
1984 | static int fuse_launder_page(struct page *page) |
1985 | { | |
1986 | int err = 0; | |
1987 | if (clear_page_dirty_for_io(page)) { | |
1988 | struct inode *inode = page->mapping->host; | |
1989 | err = fuse_writepage_locked(page); | |
1990 | if (!err) | |
1991 | fuse_wait_on_page_writeback(inode, page->index); | |
1992 | } | |
1993 | return err; | |
1994 | } | |
1995 | ||
1996 | /* | |
1997 | * Write back dirty pages now, because there may not be any suitable | |
1998 | * open files later | |
1999 | */ | |
2000 | static void fuse_vma_close(struct vm_area_struct *vma) | |
2001 | { | |
2002 | filemap_write_and_wait(vma->vm_file->f_mapping); | |
2003 | } | |
2004 | ||
2005 | /* | |
2006 | * Wait for writeback against this page to complete before allowing it | |
2007 | * to be marked dirty again, and hence written back again, possibly | |
2008 | * before the previous writepage completed. | |
2009 | * | |
2010 | * Block here, instead of in ->writepage(), so that the userspace fs | |
2011 | * can only block processes actually operating on the filesystem. | |
2012 | * | |
2013 | * Otherwise unprivileged userspace fs would be able to block | |
2014 | * unrelated: | |
2015 | * | |
2016 | * - page migration | |
2017 | * - sync(2) | |
2018 | * - try_to_free_pages() with order > PAGE_ALLOC_COSTLY_ORDER | |
2019 | */ | |
c2ec175c | 2020 | static int fuse_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
3be5a52b | 2021 | { |
c2ec175c | 2022 | struct page *page = vmf->page; |
cca24370 MS |
2023 | struct inode *inode = file_inode(vma->vm_file); |
2024 | ||
2025 | file_update_time(vma->vm_file); | |
2026 | lock_page(page); | |
2027 | if (page->mapping != inode->i_mapping) { | |
2028 | unlock_page(page); | |
2029 | return VM_FAULT_NOPAGE; | |
2030 | } | |
3be5a52b MS |
2031 | |
2032 | fuse_wait_on_page_writeback(inode, page->index); | |
cca24370 | 2033 | return VM_FAULT_LOCKED; |
3be5a52b MS |
2034 | } |
2035 | ||
f0f37e2f | 2036 | static const struct vm_operations_struct fuse_file_vm_ops = { |
3be5a52b MS |
2037 | .close = fuse_vma_close, |
2038 | .fault = filemap_fault, | |
f1820361 | 2039 | .map_pages = filemap_map_pages, |
3be5a52b MS |
2040 | .page_mkwrite = fuse_page_mkwrite, |
2041 | }; | |
2042 | ||
2043 | static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma) | |
2044 | { | |
650b22b9 PE |
2045 | if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) |
2046 | fuse_link_write_file(file); | |
2047 | ||
3be5a52b MS |
2048 | file_accessed(file); |
2049 | vma->vm_ops = &fuse_file_vm_ops; | |
b6aeaded MS |
2050 | return 0; |
2051 | } | |
2052 | ||
fc280c96 MS |
2053 | static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma) |
2054 | { | |
2055 | /* Can't provide the coherency needed for MAP_SHARED */ | |
2056 | if (vma->vm_flags & VM_MAYSHARE) | |
2057 | return -ENODEV; | |
2058 | ||
3121bfe7 MS |
2059 | invalidate_inode_pages2(file->f_mapping); |
2060 | ||
fc280c96 MS |
2061 | return generic_file_mmap(file, vma); |
2062 | } | |
2063 | ||
71421259 MS |
2064 | static int convert_fuse_file_lock(const struct fuse_file_lock *ffl, |
2065 | struct file_lock *fl) | |
2066 | { | |
2067 | switch (ffl->type) { | |
2068 | case F_UNLCK: | |
2069 | break; | |
2070 | ||
2071 | case F_RDLCK: | |
2072 | case F_WRLCK: | |
2073 | if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX || | |
2074 | ffl->end < ffl->start) | |
2075 | return -EIO; | |
2076 | ||
2077 | fl->fl_start = ffl->start; | |
2078 | fl->fl_end = ffl->end; | |
2079 | fl->fl_pid = ffl->pid; | |
2080 | break; | |
2081 | ||
2082 | default: | |
2083 | return -EIO; | |
2084 | } | |
2085 | fl->fl_type = ffl->type; | |
2086 | return 0; | |
2087 | } | |
2088 | ||
7078187a | 2089 | static void fuse_lk_fill(struct fuse_args *args, struct file *file, |
a9ff4f87 | 2090 | const struct file_lock *fl, int opcode, pid_t pid, |
7078187a | 2091 | int flock, struct fuse_lk_in *inarg) |
71421259 | 2092 | { |
6131ffaa | 2093 | struct inode *inode = file_inode(file); |
9c8ef561 | 2094 | struct fuse_conn *fc = get_fuse_conn(inode); |
71421259 | 2095 | struct fuse_file *ff = file->private_data; |
7078187a MS |
2096 | |
2097 | memset(inarg, 0, sizeof(*inarg)); | |
2098 | inarg->fh = ff->fh; | |
2099 | inarg->owner = fuse_lock_owner_id(fc, fl->fl_owner); | |
2100 | inarg->lk.start = fl->fl_start; | |
2101 | inarg->lk.end = fl->fl_end; | |
2102 | inarg->lk.type = fl->fl_type; | |
2103 | inarg->lk.pid = pid; | |
a9ff4f87 | 2104 | if (flock) |
7078187a MS |
2105 | inarg->lk_flags |= FUSE_LK_FLOCK; |
2106 | args->in.h.opcode = opcode; | |
2107 | args->in.h.nodeid = get_node_id(inode); | |
2108 | args->in.numargs = 1; | |
2109 | args->in.args[0].size = sizeof(*inarg); | |
2110 | args->in.args[0].value = inarg; | |
71421259 MS |
2111 | } |
2112 | ||
2113 | static int fuse_getlk(struct file *file, struct file_lock *fl) | |
2114 | { | |
6131ffaa | 2115 | struct inode *inode = file_inode(file); |
71421259 | 2116 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a MS |
2117 | FUSE_ARGS(args); |
2118 | struct fuse_lk_in inarg; | |
71421259 MS |
2119 | struct fuse_lk_out outarg; |
2120 | int err; | |
2121 | ||
7078187a MS |
2122 | fuse_lk_fill(&args, file, fl, FUSE_GETLK, 0, 0, &inarg); |
2123 | args.out.numargs = 1; | |
2124 | args.out.args[0].size = sizeof(outarg); | |
2125 | args.out.args[0].value = &outarg; | |
2126 | err = fuse_simple_request(fc, &args); | |
71421259 MS |
2127 | if (!err) |
2128 | err = convert_fuse_file_lock(&outarg.lk, fl); | |
2129 | ||
2130 | return err; | |
2131 | } | |
2132 | ||
a9ff4f87 | 2133 | static int fuse_setlk(struct file *file, struct file_lock *fl, int flock) |
71421259 | 2134 | { |
6131ffaa | 2135 | struct inode *inode = file_inode(file); |
71421259 | 2136 | struct fuse_conn *fc = get_fuse_conn(inode); |
7078187a MS |
2137 | FUSE_ARGS(args); |
2138 | struct fuse_lk_in inarg; | |
71421259 MS |
2139 | int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK; |
2140 | pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0; | |
2141 | int err; | |
2142 | ||
8fb47a4f | 2143 | if (fl->fl_lmops && fl->fl_lmops->lm_grant) { |
48e90761 MS |
2144 | /* NLM needs asynchronous locks, which we don't support yet */ |
2145 | return -ENOLCK; | |
2146 | } | |
2147 | ||
71421259 MS |
2148 | /* Unlock on close is handled by the flush method */ |
2149 | if (fl->fl_flags & FL_CLOSE) | |
2150 | return 0; | |
2151 | ||
7078187a MS |
2152 | fuse_lk_fill(&args, file, fl, opcode, pid, flock, &inarg); |
2153 | err = fuse_simple_request(fc, &args); | |
71421259 | 2154 | |
a4d27e75 MS |
2155 | /* locking is restartable */ |
2156 | if (err == -EINTR) | |
2157 | err = -ERESTARTSYS; | |
7078187a | 2158 | |
71421259 MS |
2159 | return err; |
2160 | } | |
2161 | ||
2162 | static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl) | |
2163 | { | |
6131ffaa | 2164 | struct inode *inode = file_inode(file); |
71421259 MS |
2165 | struct fuse_conn *fc = get_fuse_conn(inode); |
2166 | int err; | |
2167 | ||
48e90761 MS |
2168 | if (cmd == F_CANCELLK) { |
2169 | err = 0; | |
2170 | } else if (cmd == F_GETLK) { | |
71421259 | 2171 | if (fc->no_lock) { |
9d6a8c5c | 2172 | posix_test_lock(file, fl); |
71421259 MS |
2173 | err = 0; |
2174 | } else | |
2175 | err = fuse_getlk(file, fl); | |
2176 | } else { | |
2177 | if (fc->no_lock) | |
48e90761 | 2178 | err = posix_lock_file(file, fl, NULL); |
71421259 | 2179 | else |
a9ff4f87 | 2180 | err = fuse_setlk(file, fl, 0); |
71421259 MS |
2181 | } |
2182 | return err; | |
2183 | } | |
2184 | ||
a9ff4f87 MS |
2185 | static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl) |
2186 | { | |
6131ffaa | 2187 | struct inode *inode = file_inode(file); |
a9ff4f87 MS |
2188 | struct fuse_conn *fc = get_fuse_conn(inode); |
2189 | int err; | |
2190 | ||
37fb3a30 | 2191 | if (fc->no_flock) { |
a9ff4f87 MS |
2192 | err = flock_lock_file_wait(file, fl); |
2193 | } else { | |
37fb3a30 MS |
2194 | struct fuse_file *ff = file->private_data; |
2195 | ||
a9ff4f87 | 2196 | /* emulate flock with POSIX locks */ |
37fb3a30 | 2197 | ff->flock = true; |
a9ff4f87 MS |
2198 | err = fuse_setlk(file, fl, 1); |
2199 | } | |
2200 | ||
2201 | return err; | |
2202 | } | |
2203 | ||
b2d2272f MS |
2204 | static sector_t fuse_bmap(struct address_space *mapping, sector_t block) |
2205 | { | |
2206 | struct inode *inode = mapping->host; | |
2207 | struct fuse_conn *fc = get_fuse_conn(inode); | |
7078187a | 2208 | FUSE_ARGS(args); |
b2d2272f MS |
2209 | struct fuse_bmap_in inarg; |
2210 | struct fuse_bmap_out outarg; | |
2211 | int err; | |
2212 | ||
2213 | if (!inode->i_sb->s_bdev || fc->no_bmap) | |
2214 | return 0; | |
2215 | ||
b2d2272f MS |
2216 | memset(&inarg, 0, sizeof(inarg)); |
2217 | inarg.block = block; | |
2218 | inarg.blocksize = inode->i_sb->s_blocksize; | |
7078187a MS |
2219 | args.in.h.opcode = FUSE_BMAP; |
2220 | args.in.h.nodeid = get_node_id(inode); | |
2221 | args.in.numargs = 1; | |
2222 | args.in.args[0].size = sizeof(inarg); | |
2223 | args.in.args[0].value = &inarg; | |
2224 | args.out.numargs = 1; | |
2225 | args.out.args[0].size = sizeof(outarg); | |
2226 | args.out.args[0].value = &outarg; | |
2227 | err = fuse_simple_request(fc, &args); | |
b2d2272f MS |
2228 | if (err == -ENOSYS) |
2229 | fc->no_bmap = 1; | |
2230 | ||
2231 | return err ? 0 : outarg.block; | |
2232 | } | |
2233 | ||
965c8e59 | 2234 | static loff_t fuse_file_llseek(struct file *file, loff_t offset, int whence) |
5559b8f4 MS |
2235 | { |
2236 | loff_t retval; | |
6131ffaa | 2237 | struct inode *inode = file_inode(file); |
5559b8f4 | 2238 | |
c07c3d19 | 2239 | /* No i_mutex protection necessary for SEEK_CUR and SEEK_SET */ |
965c8e59 AM |
2240 | if (whence == SEEK_CUR || whence == SEEK_SET) |
2241 | return generic_file_llseek(file, offset, whence); | |
06222e49 | 2242 | |
c07c3d19 MS |
2243 | mutex_lock(&inode->i_mutex); |
2244 | retval = fuse_update_attributes(inode, NULL, file, NULL); | |
2245 | if (!retval) | |
965c8e59 | 2246 | retval = generic_file_llseek(file, offset, whence); |
5559b8f4 | 2247 | mutex_unlock(&inode->i_mutex); |
c07c3d19 | 2248 | |
5559b8f4 MS |
2249 | return retval; |
2250 | } | |
2251 | ||
59efec7b TH |
2252 | static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov, |
2253 | unsigned int nr_segs, size_t bytes, bool to_user) | |
2254 | { | |
2255 | struct iov_iter ii; | |
2256 | int page_idx = 0; | |
2257 | ||
2258 | if (!bytes) | |
2259 | return 0; | |
2260 | ||
71d8e532 | 2261 | iov_iter_init(&ii, to_user ? READ : WRITE, iov, nr_segs, bytes); |
59efec7b TH |
2262 | |
2263 | while (iov_iter_count(&ii)) { | |
2264 | struct page *page = pages[page_idx++]; | |
2265 | size_t todo = min_t(size_t, PAGE_SIZE, iov_iter_count(&ii)); | |
4aa0edd2 | 2266 | void *kaddr; |
59efec7b | 2267 | |
4aa0edd2 | 2268 | kaddr = kmap(page); |
59efec7b TH |
2269 | |
2270 | while (todo) { | |
2271 | char __user *uaddr = ii.iov->iov_base + ii.iov_offset; | |
2272 | size_t iov_len = ii.iov->iov_len - ii.iov_offset; | |
2273 | size_t copy = min(todo, iov_len); | |
2274 | size_t left; | |
2275 | ||
2276 | if (!to_user) | |
2277 | left = copy_from_user(kaddr, uaddr, copy); | |
2278 | else | |
2279 | left = copy_to_user(uaddr, kaddr, copy); | |
2280 | ||
2281 | if (unlikely(left)) | |
2282 | return -EFAULT; | |
2283 | ||
2284 | iov_iter_advance(&ii, copy); | |
2285 | todo -= copy; | |
2286 | kaddr += copy; | |
2287 | } | |
2288 | ||
0bd87182 | 2289 | kunmap(page); |
59efec7b TH |
2290 | } |
2291 | ||
2292 | return 0; | |
2293 | } | |
2294 | ||
d9d318d3 MS |
2295 | /* |
2296 | * CUSE servers compiled on 32bit broke on 64bit kernels because the | |
2297 | * ABI was defined to be 'struct iovec' which is different on 32bit | |
2298 | * and 64bit. Fortunately we can determine which structure the server | |
2299 | * used from the size of the reply. | |
2300 | */ | |
1baa26b2 MS |
2301 | static int fuse_copy_ioctl_iovec_old(struct iovec *dst, void *src, |
2302 | size_t transferred, unsigned count, | |
2303 | bool is_compat) | |
d9d318d3 MS |
2304 | { |
2305 | #ifdef CONFIG_COMPAT | |
2306 | if (count * sizeof(struct compat_iovec) == transferred) { | |
2307 | struct compat_iovec *ciov = src; | |
2308 | unsigned i; | |
2309 | ||
2310 | /* | |
2311 | * With this interface a 32bit server cannot support | |
2312 | * non-compat (i.e. ones coming from 64bit apps) ioctl | |
2313 | * requests | |
2314 | */ | |
2315 | if (!is_compat) | |
2316 | return -EINVAL; | |
2317 | ||
2318 | for (i = 0; i < count; i++) { | |
2319 | dst[i].iov_base = compat_ptr(ciov[i].iov_base); | |
2320 | dst[i].iov_len = ciov[i].iov_len; | |
2321 | } | |
2322 | return 0; | |
2323 | } | |
2324 | #endif | |
2325 | ||
2326 | if (count * sizeof(struct iovec) != transferred) | |
2327 | return -EIO; | |
2328 | ||
2329 | memcpy(dst, src, transferred); | |
2330 | return 0; | |
2331 | } | |
2332 | ||
7572777e MS |
2333 | /* Make sure iov_length() won't overflow */ |
2334 | static int fuse_verify_ioctl_iov(struct iovec *iov, size_t count) | |
2335 | { | |
2336 | size_t n; | |
2337 | u32 max = FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT; | |
2338 | ||
fb6ccff6 | 2339 | for (n = 0; n < count; n++, iov++) { |
7572777e MS |
2340 | if (iov->iov_len > (size_t) max) |
2341 | return -ENOMEM; | |
2342 | max -= iov->iov_len; | |
2343 | } | |
2344 | return 0; | |
2345 | } | |
2346 | ||
1baa26b2 MS |
2347 | static int fuse_copy_ioctl_iovec(struct fuse_conn *fc, struct iovec *dst, |
2348 | void *src, size_t transferred, unsigned count, | |
2349 | bool is_compat) | |
2350 | { | |
2351 | unsigned i; | |
2352 | struct fuse_ioctl_iovec *fiov = src; | |
2353 | ||
2354 | if (fc->minor < 16) { | |
2355 | return fuse_copy_ioctl_iovec_old(dst, src, transferred, | |
2356 | count, is_compat); | |
2357 | } | |
2358 | ||
2359 | if (count * sizeof(struct fuse_ioctl_iovec) != transferred) | |
2360 | return -EIO; | |
2361 | ||
2362 | for (i = 0; i < count; i++) { | |
2363 | /* Did the server supply an inappropriate value? */ | |
2364 | if (fiov[i].base != (unsigned long) fiov[i].base || | |
2365 | fiov[i].len != (unsigned long) fiov[i].len) | |
2366 | return -EIO; | |
2367 | ||
2368 | dst[i].iov_base = (void __user *) (unsigned long) fiov[i].base; | |
2369 | dst[i].iov_len = (size_t) fiov[i].len; | |
2370 | ||
2371 | #ifdef CONFIG_COMPAT | |
2372 | if (is_compat && | |
2373 | (ptr_to_compat(dst[i].iov_base) != fiov[i].base || | |
2374 | (compat_size_t) dst[i].iov_len != fiov[i].len)) | |
2375 | return -EIO; | |
2376 | #endif | |
2377 | } | |
2378 | ||
2379 | return 0; | |
2380 | } | |
2381 | ||
2382 | ||
59efec7b TH |
2383 | /* |
2384 | * For ioctls, there is no generic way to determine how much memory | |
2385 | * needs to be read and/or written. Furthermore, ioctls are allowed | |
2386 | * to dereference the passed pointer, so the parameter requires deep | |
2387 | * copying but FUSE has no idea whatsoever about what to copy in or | |
2388 | * out. | |
2389 | * | |
2390 | * This is solved by allowing FUSE server to retry ioctl with | |
2391 | * necessary in/out iovecs. Let's assume the ioctl implementation | |
2392 | * needs to read in the following structure. | |
2393 | * | |
2394 | * struct a { | |
2395 | * char *buf; | |
2396 | * size_t buflen; | |
2397 | * } | |
2398 | * | |
2399 | * On the first callout to FUSE server, inarg->in_size and | |
2400 | * inarg->out_size will be NULL; then, the server completes the ioctl | |
2401 | * with FUSE_IOCTL_RETRY set in out->flags, out->in_iovs set to 1 and | |
2402 | * the actual iov array to | |
2403 | * | |
2404 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) } } | |
2405 | * | |
2406 | * which tells FUSE to copy in the requested area and retry the ioctl. | |
2407 | * On the second round, the server has access to the structure and | |
2408 | * from that it can tell what to look for next, so on the invocation, | |
2409 | * it sets FUSE_IOCTL_RETRY, out->in_iovs to 2 and iov array to | |
2410 | * | |
2411 | * { { .iov_base = inarg.arg, .iov_len = sizeof(struct a) }, | |
2412 | * { .iov_base = a.buf, .iov_len = a.buflen } } | |
2413 | * | |
2414 | * FUSE will copy both struct a and the pointed buffer from the | |
2415 | * process doing the ioctl and retry ioctl with both struct a and the | |
2416 | * buffer. | |
2417 | * | |
2418 | * This time, FUSE server has everything it needs and completes ioctl | |
2419 | * without FUSE_IOCTL_RETRY which finishes the ioctl call. | |
2420 | * | |
2421 | * Copying data out works the same way. | |
2422 | * | |
2423 | * Note that if FUSE_IOCTL_UNRESTRICTED is clear, the kernel | |
2424 | * automatically initializes in and out iovs by decoding @cmd with | |
2425 | * _IOC_* macros and the server is not allowed to request RETRY. This | |
2426 | * limits ioctl data transfers to well-formed ioctls and is the forced | |
2427 | * behavior for all FUSE servers. | |
2428 | */ | |
08cbf542 TH |
2429 | long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, |
2430 | unsigned int flags) | |
59efec7b | 2431 | { |
59efec7b | 2432 | struct fuse_file *ff = file->private_data; |
d36f2487 | 2433 | struct fuse_conn *fc = ff->fc; |
59efec7b TH |
2434 | struct fuse_ioctl_in inarg = { |
2435 | .fh = ff->fh, | |
2436 | .cmd = cmd, | |
2437 | .arg = arg, | |
2438 | .flags = flags | |
2439 | }; | |
2440 | struct fuse_ioctl_out outarg; | |
2441 | struct fuse_req *req = NULL; | |
2442 | struct page **pages = NULL; | |
8ac83505 | 2443 | struct iovec *iov_page = NULL; |
59efec7b TH |
2444 | struct iovec *in_iov = NULL, *out_iov = NULL; |
2445 | unsigned int in_iovs = 0, out_iovs = 0, num_pages = 0, max_pages; | |
2446 | size_t in_size, out_size, transferred; | |
2447 | int err; | |
2448 | ||
1baa26b2 MS |
2449 | #if BITS_PER_LONG == 32 |
2450 | inarg.flags |= FUSE_IOCTL_32BIT; | |
2451 | #else | |
2452 | if (flags & FUSE_IOCTL_COMPAT) | |
2453 | inarg.flags |= FUSE_IOCTL_32BIT; | |
2454 | #endif | |
2455 | ||
59efec7b | 2456 | /* assume all the iovs returned by client always fits in a page */ |
1baa26b2 | 2457 | BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE); |
59efec7b | 2458 | |
59efec7b | 2459 | err = -ENOMEM; |
c411cc88 | 2460 | pages = kcalloc(FUSE_MAX_PAGES_PER_REQ, sizeof(pages[0]), GFP_KERNEL); |
8ac83505 | 2461 | iov_page = (struct iovec *) __get_free_page(GFP_KERNEL); |
59efec7b TH |
2462 | if (!pages || !iov_page) |
2463 | goto out; | |
2464 | ||
2465 | /* | |
2466 | * If restricted, initialize IO parameters as encoded in @cmd. | |
2467 | * RETRY from server is not allowed. | |
2468 | */ | |
2469 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) { | |
8ac83505 | 2470 | struct iovec *iov = iov_page; |
59efec7b | 2471 | |
c9f0523d | 2472 | iov->iov_base = (void __user *)arg; |
59efec7b TH |
2473 | iov->iov_len = _IOC_SIZE(cmd); |
2474 | ||
2475 | if (_IOC_DIR(cmd) & _IOC_WRITE) { | |
2476 | in_iov = iov; | |
2477 | in_iovs = 1; | |
2478 | } | |
2479 | ||
2480 | if (_IOC_DIR(cmd) & _IOC_READ) { | |
2481 | out_iov = iov; | |
2482 | out_iovs = 1; | |
2483 | } | |
2484 | } | |
2485 | ||
2486 | retry: | |
2487 | inarg.in_size = in_size = iov_length(in_iov, in_iovs); | |
2488 | inarg.out_size = out_size = iov_length(out_iov, out_iovs); | |
2489 | ||
2490 | /* | |
2491 | * Out data can be used either for actual out data or iovs, | |
2492 | * make sure there always is at least one page. | |
2493 | */ | |
2494 | out_size = max_t(size_t, out_size, PAGE_SIZE); | |
2495 | max_pages = DIV_ROUND_UP(max(in_size, out_size), PAGE_SIZE); | |
2496 | ||
2497 | /* make sure there are enough buffer pages and init request with them */ | |
2498 | err = -ENOMEM; | |
2499 | if (max_pages > FUSE_MAX_PAGES_PER_REQ) | |
2500 | goto out; | |
2501 | while (num_pages < max_pages) { | |
2502 | pages[num_pages] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM); | |
2503 | if (!pages[num_pages]) | |
2504 | goto out; | |
2505 | num_pages++; | |
2506 | } | |
2507 | ||
54b96670 | 2508 | req = fuse_get_req(fc, num_pages); |
59efec7b TH |
2509 | if (IS_ERR(req)) { |
2510 | err = PTR_ERR(req); | |
2511 | req = NULL; | |
2512 | goto out; | |
2513 | } | |
2514 | memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages); | |
2515 | req->num_pages = num_pages; | |
7c190c8b | 2516 | fuse_page_descs_length_init(req, 0, req->num_pages); |
59efec7b TH |
2517 | |
2518 | /* okay, let's send it to the client */ | |
2519 | req->in.h.opcode = FUSE_IOCTL; | |
d36f2487 | 2520 | req->in.h.nodeid = ff->nodeid; |
59efec7b TH |
2521 | req->in.numargs = 1; |
2522 | req->in.args[0].size = sizeof(inarg); | |
2523 | req->in.args[0].value = &inarg; | |
2524 | if (in_size) { | |
2525 | req->in.numargs++; | |
2526 | req->in.args[1].size = in_size; | |
2527 | req->in.argpages = 1; | |
2528 | ||
2529 | err = fuse_ioctl_copy_user(pages, in_iov, in_iovs, in_size, | |
2530 | false); | |
2531 | if (err) | |
2532 | goto out; | |
2533 | } | |
2534 | ||
2535 | req->out.numargs = 2; | |
2536 | req->out.args[0].size = sizeof(outarg); | |
2537 | req->out.args[0].value = &outarg; | |
2538 | req->out.args[1].size = out_size; | |
2539 | req->out.argpages = 1; | |
2540 | req->out.argvar = 1; | |
2541 | ||
b93f858a | 2542 | fuse_request_send(fc, req); |
59efec7b TH |
2543 | err = req->out.h.error; |
2544 | transferred = req->out.args[1].size; | |
2545 | fuse_put_request(fc, req); | |
2546 | req = NULL; | |
2547 | if (err) | |
2548 | goto out; | |
2549 | ||
2550 | /* did it ask for retry? */ | |
2551 | if (outarg.flags & FUSE_IOCTL_RETRY) { | |
8ac83505 | 2552 | void *vaddr; |
59efec7b TH |
2553 | |
2554 | /* no retry if in restricted mode */ | |
2555 | err = -EIO; | |
2556 | if (!(flags & FUSE_IOCTL_UNRESTRICTED)) | |
2557 | goto out; | |
2558 | ||
2559 | in_iovs = outarg.in_iovs; | |
2560 | out_iovs = outarg.out_iovs; | |
2561 | ||
2562 | /* | |
2563 | * Make sure things are in boundary, separate checks | |
2564 | * are to protect against overflow. | |
2565 | */ | |
2566 | err = -ENOMEM; | |
2567 | if (in_iovs > FUSE_IOCTL_MAX_IOV || | |
2568 | out_iovs > FUSE_IOCTL_MAX_IOV || | |
2569 | in_iovs + out_iovs > FUSE_IOCTL_MAX_IOV) | |
2570 | goto out; | |
2571 | ||
2408f6ef | 2572 | vaddr = kmap_atomic(pages[0]); |
1baa26b2 | 2573 | err = fuse_copy_ioctl_iovec(fc, iov_page, vaddr, |
d9d318d3 MS |
2574 | transferred, in_iovs + out_iovs, |
2575 | (flags & FUSE_IOCTL_COMPAT) != 0); | |
2408f6ef | 2576 | kunmap_atomic(vaddr); |
d9d318d3 MS |
2577 | if (err) |
2578 | goto out; | |
59efec7b | 2579 | |
8ac83505 | 2580 | in_iov = iov_page; |
59efec7b TH |
2581 | out_iov = in_iov + in_iovs; |
2582 | ||
7572777e MS |
2583 | err = fuse_verify_ioctl_iov(in_iov, in_iovs); |
2584 | if (err) | |
2585 | goto out; | |
2586 | ||
2587 | err = fuse_verify_ioctl_iov(out_iov, out_iovs); | |
2588 | if (err) | |
2589 | goto out; | |
2590 | ||
59efec7b TH |
2591 | goto retry; |
2592 | } | |
2593 | ||
2594 | err = -EIO; | |
2595 | if (transferred > inarg.out_size) | |
2596 | goto out; | |
2597 | ||
2598 | err = fuse_ioctl_copy_user(pages, out_iov, out_iovs, transferred, true); | |
2599 | out: | |
2600 | if (req) | |
2601 | fuse_put_request(fc, req); | |
8ac83505 | 2602 | free_page((unsigned long) iov_page); |
59efec7b TH |
2603 | while (num_pages) |
2604 | __free_page(pages[--num_pages]); | |
2605 | kfree(pages); | |
2606 | ||
2607 | return err ? err : outarg.result; | |
2608 | } | |
08cbf542 | 2609 | EXPORT_SYMBOL_GPL(fuse_do_ioctl); |
59efec7b | 2610 | |
b18da0c5 MS |
2611 | long fuse_ioctl_common(struct file *file, unsigned int cmd, |
2612 | unsigned long arg, unsigned int flags) | |
d36f2487 | 2613 | { |
6131ffaa | 2614 | struct inode *inode = file_inode(file); |
d36f2487 MS |
2615 | struct fuse_conn *fc = get_fuse_conn(inode); |
2616 | ||
c2132c1b | 2617 | if (!fuse_allow_current_process(fc)) |
d36f2487 MS |
2618 | return -EACCES; |
2619 | ||
2620 | if (is_bad_inode(inode)) | |
2621 | return -EIO; | |
2622 | ||
2623 | return fuse_do_ioctl(file, cmd, arg, flags); | |
2624 | } | |
2625 | ||
59efec7b TH |
2626 | static long fuse_file_ioctl(struct file *file, unsigned int cmd, |
2627 | unsigned long arg) | |
2628 | { | |
b18da0c5 | 2629 | return fuse_ioctl_common(file, cmd, arg, 0); |
59efec7b TH |
2630 | } |
2631 | ||
2632 | static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd, | |
2633 | unsigned long arg) | |
2634 | { | |
b18da0c5 | 2635 | return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT); |
59efec7b TH |
2636 | } |
2637 | ||
95668a69 TH |
2638 | /* |
2639 | * All files which have been polled are linked to RB tree | |
2640 | * fuse_conn->polled_files which is indexed by kh. Walk the tree and | |
2641 | * find the matching one. | |
2642 | */ | |
2643 | static struct rb_node **fuse_find_polled_node(struct fuse_conn *fc, u64 kh, | |
2644 | struct rb_node **parent_out) | |
2645 | { | |
2646 | struct rb_node **link = &fc->polled_files.rb_node; | |
2647 | struct rb_node *last = NULL; | |
2648 | ||
2649 | while (*link) { | |
2650 | struct fuse_file *ff; | |
2651 | ||
2652 | last = *link; | |
2653 | ff = rb_entry(last, struct fuse_file, polled_node); | |
2654 | ||
2655 | if (kh < ff->kh) | |
2656 | link = &last->rb_left; | |
2657 | else if (kh > ff->kh) | |
2658 | link = &last->rb_right; | |
2659 | else | |
2660 | return link; | |
2661 | } | |
2662 | ||
2663 | if (parent_out) | |
2664 | *parent_out = last; | |
2665 | return link; | |
2666 | } | |
2667 | ||
2668 | /* | |
2669 | * The file is about to be polled. Make sure it's on the polled_files | |
2670 | * RB tree. Note that files once added to the polled_files tree are | |
2671 | * not removed before the file is released. This is because a file | |
2672 | * polled once is likely to be polled again. | |
2673 | */ | |
2674 | static void fuse_register_polled_file(struct fuse_conn *fc, | |
2675 | struct fuse_file *ff) | |
2676 | { | |
2677 | spin_lock(&fc->lock); | |
2678 | if (RB_EMPTY_NODE(&ff->polled_node)) { | |
f3846266 | 2679 | struct rb_node **link, *uninitialized_var(parent); |
95668a69 TH |
2680 | |
2681 | link = fuse_find_polled_node(fc, ff->kh, &parent); | |
2682 | BUG_ON(*link); | |
2683 | rb_link_node(&ff->polled_node, parent, link); | |
2684 | rb_insert_color(&ff->polled_node, &fc->polled_files); | |
2685 | } | |
2686 | spin_unlock(&fc->lock); | |
2687 | } | |
2688 | ||
08cbf542 | 2689 | unsigned fuse_file_poll(struct file *file, poll_table *wait) |
95668a69 | 2690 | { |
95668a69 | 2691 | struct fuse_file *ff = file->private_data; |
797759aa | 2692 | struct fuse_conn *fc = ff->fc; |
95668a69 TH |
2693 | struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh }; |
2694 | struct fuse_poll_out outarg; | |
7078187a | 2695 | FUSE_ARGS(args); |
95668a69 TH |
2696 | int err; |
2697 | ||
2698 | if (fc->no_poll) | |
2699 | return DEFAULT_POLLMASK; | |
2700 | ||
2701 | poll_wait(file, &ff->poll_wait, wait); | |
0415d291 | 2702 | inarg.events = (__u32)poll_requested_events(wait); |
95668a69 TH |
2703 | |
2704 | /* | |
2705 | * Ask for notification iff there's someone waiting for it. | |
2706 | * The client may ignore the flag and always notify. | |
2707 | */ | |
2708 | if (waitqueue_active(&ff->poll_wait)) { | |
2709 | inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY; | |
2710 | fuse_register_polled_file(fc, ff); | |
2711 | } | |
2712 | ||
7078187a MS |
2713 | args.in.h.opcode = FUSE_POLL; |
2714 | args.in.h.nodeid = ff->nodeid; | |
2715 | args.in.numargs = 1; | |
2716 | args.in.args[0].size = sizeof(inarg); | |
2717 | args.in.args[0].value = &inarg; | |
2718 | args.out.numargs = 1; | |
2719 | args.out.args[0].size = sizeof(outarg); | |
2720 | args.out.args[0].value = &outarg; | |
2721 | err = fuse_simple_request(fc, &args); | |
95668a69 TH |
2722 | |
2723 | if (!err) | |
2724 | return outarg.revents; | |
2725 | if (err == -ENOSYS) { | |
2726 | fc->no_poll = 1; | |
2727 | return DEFAULT_POLLMASK; | |
2728 | } | |
2729 | return POLLERR; | |
2730 | } | |
08cbf542 | 2731 | EXPORT_SYMBOL_GPL(fuse_file_poll); |
95668a69 TH |
2732 | |
2733 | /* | |
2734 | * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and | |
2735 | * wakes up the poll waiters. | |
2736 | */ | |
2737 | int fuse_notify_poll_wakeup(struct fuse_conn *fc, | |
2738 | struct fuse_notify_poll_wakeup_out *outarg) | |
2739 | { | |
2740 | u64 kh = outarg->kh; | |
2741 | struct rb_node **link; | |
2742 | ||
2743 | spin_lock(&fc->lock); | |
2744 | ||
2745 | link = fuse_find_polled_node(fc, kh, NULL); | |
2746 | if (*link) { | |
2747 | struct fuse_file *ff; | |
2748 | ||
2749 | ff = rb_entry(*link, struct fuse_file, polled_node); | |
2750 | wake_up_interruptible_sync(&ff->poll_wait); | |
2751 | } | |
2752 | ||
2753 | spin_unlock(&fc->lock); | |
2754 | return 0; | |
2755 | } | |
2756 | ||
efb9fa9e MP |
2757 | static void fuse_do_truncate(struct file *file) |
2758 | { | |
2759 | struct inode *inode = file->f_mapping->host; | |
2760 | struct iattr attr; | |
2761 | ||
2762 | attr.ia_valid = ATTR_SIZE; | |
2763 | attr.ia_size = i_size_read(inode); | |
2764 | ||
2765 | attr.ia_file = file; | |
2766 | attr.ia_valid |= ATTR_FILE; | |
2767 | ||
2768 | fuse_do_setattr(inode, &attr, file); | |
2769 | } | |
2770 | ||
e5c5f05d MP |
2771 | static inline loff_t fuse_round_up(loff_t off) |
2772 | { | |
2773 | return round_up(off, FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT); | |
2774 | } | |
2775 | ||
4273b793 | 2776 | static ssize_t |
22c6186e | 2777 | fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t offset) |
4273b793 | 2778 | { |
9d5722b7 | 2779 | DECLARE_COMPLETION_ONSTACK(wait); |
4273b793 | 2780 | ssize_t ret = 0; |
60b9df7a MS |
2781 | struct file *file = iocb->ki_filp; |
2782 | struct fuse_file *ff = file->private_data; | |
e5c5f05d | 2783 | bool async_dio = ff->fc->async_dio; |
4273b793 | 2784 | loff_t pos = 0; |
bcba24cc MP |
2785 | struct inode *inode; |
2786 | loff_t i_size; | |
a6cbcd4a | 2787 | size_t count = iov_iter_count(iter); |
36cf66ed | 2788 | struct fuse_io_priv *io; |
4273b793 | 2789 | |
4273b793 | 2790 | pos = offset; |
bcba24cc MP |
2791 | inode = file->f_mapping->host; |
2792 | i_size = i_size_read(inode); | |
4273b793 | 2793 | |
6f673763 | 2794 | if ((iov_iter_rw(iter) == READ) && (offset > i_size)) |
9fe55eea SW |
2795 | return 0; |
2796 | ||
439ee5f0 | 2797 | /* optimization for short read */ |
6f673763 | 2798 | if (async_dio && iov_iter_rw(iter) != WRITE && offset + count > i_size) { |
439ee5f0 MP |
2799 | if (offset >= i_size) |
2800 | return 0; | |
6b775b18 AV |
2801 | iov_iter_truncate(iter, fuse_round_up(i_size - offset)); |
2802 | count = iov_iter_count(iter); | |
439ee5f0 MP |
2803 | } |
2804 | ||
bcba24cc | 2805 | io = kmalloc(sizeof(struct fuse_io_priv), GFP_KERNEL); |
36cf66ed MP |
2806 | if (!io) |
2807 | return -ENOMEM; | |
bcba24cc MP |
2808 | spin_lock_init(&io->lock); |
2809 | io->reqs = 1; | |
2810 | io->bytes = -1; | |
2811 | io->size = 0; | |
2812 | io->offset = offset; | |
6f673763 | 2813 | io->write = (iov_iter_rw(iter) == WRITE); |
bcba24cc | 2814 | io->err = 0; |
36cf66ed | 2815 | io->file = file; |
bcba24cc MP |
2816 | /* |
2817 | * By default, we want to optimize all I/Os with async request | |
60b9df7a | 2818 | * submission to the client filesystem if supported. |
bcba24cc | 2819 | */ |
e5c5f05d | 2820 | io->async = async_dio; |
bcba24cc MP |
2821 | io->iocb = iocb; |
2822 | ||
2823 | /* | |
2824 | * We cannot asynchronously extend the size of a file. We have no method | |
2825 | * to wait on real async I/O requests, so we must submit this request | |
2826 | * synchronously. | |
2827 | */ | |
6f673763 OS |
2828 | if (!is_sync_kiocb(iocb) && (offset + count > i_size) && |
2829 | iov_iter_rw(iter) == WRITE) | |
bcba24cc | 2830 | io->async = false; |
4273b793 | 2831 | |
9d5722b7 CH |
2832 | if (io->async && is_sync_kiocb(iocb)) |
2833 | io->done = &wait; | |
2834 | ||
6f673763 | 2835 | if (iov_iter_rw(iter) == WRITE) { |
6b775b18 | 2836 | ret = fuse_direct_io(io, iter, &pos, FUSE_DIO_WRITE); |
812408fb AV |
2837 | fuse_invalidate_attr(inode); |
2838 | } else { | |
d22a943f | 2839 | ret = __fuse_direct_read(io, iter, &pos); |
812408fb | 2840 | } |
36cf66ed | 2841 | |
bcba24cc MP |
2842 | if (io->async) { |
2843 | fuse_aio_complete(io, ret < 0 ? ret : 0, -1); | |
2844 | ||
2845 | /* we have a non-extending, async request, so return */ | |
c9ecf989 | 2846 | if (!is_sync_kiocb(iocb)) |
bcba24cc MP |
2847 | return -EIOCBQUEUED; |
2848 | ||
9d5722b7 CH |
2849 | wait_for_completion(&wait); |
2850 | ret = fuse_get_res_by_io(io); | |
bcba24cc MP |
2851 | } |
2852 | ||
9d5722b7 CH |
2853 | kfree(io); |
2854 | ||
6f673763 | 2855 | if (iov_iter_rw(iter) == WRITE) { |
efb9fa9e MP |
2856 | if (ret > 0) |
2857 | fuse_write_update_size(inode, pos); | |
2858 | else if (ret < 0 && offset + count > i_size) | |
2859 | fuse_do_truncate(file); | |
2860 | } | |
4273b793 AA |
2861 | |
2862 | return ret; | |
2863 | } | |
2864 | ||
cdadb11c MS |
2865 | static long fuse_file_fallocate(struct file *file, int mode, loff_t offset, |
2866 | loff_t length) | |
05ba1f08 AP |
2867 | { |
2868 | struct fuse_file *ff = file->private_data; | |
1c68271c | 2869 | struct inode *inode = file_inode(file); |
0ab08f57 | 2870 | struct fuse_inode *fi = get_fuse_inode(inode); |
05ba1f08 | 2871 | struct fuse_conn *fc = ff->fc; |
7078187a | 2872 | FUSE_ARGS(args); |
05ba1f08 AP |
2873 | struct fuse_fallocate_in inarg = { |
2874 | .fh = ff->fh, | |
2875 | .offset = offset, | |
2876 | .length = length, | |
2877 | .mode = mode | |
2878 | }; | |
2879 | int err; | |
14c14414 MP |
2880 | bool lock_inode = !(mode & FALLOC_FL_KEEP_SIZE) || |
2881 | (mode & FALLOC_FL_PUNCH_HOLE); | |
05ba1f08 | 2882 | |
4adb8302 MS |
2883 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) |
2884 | return -EOPNOTSUPP; | |
2885 | ||
519c6040 MS |
2886 | if (fc->no_fallocate) |
2887 | return -EOPNOTSUPP; | |
2888 | ||
14c14414 | 2889 | if (lock_inode) { |
3634a632 | 2890 | mutex_lock(&inode->i_mutex); |
bde52788 MP |
2891 | if (mode & FALLOC_FL_PUNCH_HOLE) { |
2892 | loff_t endbyte = offset + length - 1; | |
2893 | err = filemap_write_and_wait_range(inode->i_mapping, | |
2894 | offset, endbyte); | |
2895 | if (err) | |
2896 | goto out; | |
2897 | ||
2898 | fuse_sync_writes(inode); | |
2899 | } | |
3634a632 BF |
2900 | } |
2901 | ||
0ab08f57 MP |
2902 | if (!(mode & FALLOC_FL_KEEP_SIZE)) |
2903 | set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); | |
2904 | ||
7078187a MS |
2905 | args.in.h.opcode = FUSE_FALLOCATE; |
2906 | args.in.h.nodeid = ff->nodeid; | |
2907 | args.in.numargs = 1; | |
2908 | args.in.args[0].size = sizeof(inarg); | |
2909 | args.in.args[0].value = &inarg; | |
2910 | err = fuse_simple_request(fc, &args); | |
519c6040 MS |
2911 | if (err == -ENOSYS) { |
2912 | fc->no_fallocate = 1; | |
2913 | err = -EOPNOTSUPP; | |
2914 | } | |
bee6c307 BF |
2915 | if (err) |
2916 | goto out; | |
2917 | ||
2918 | /* we could have extended the file */ | |
b0aa7606 MP |
2919 | if (!(mode & FALLOC_FL_KEEP_SIZE)) { |
2920 | bool changed = fuse_write_update_size(inode, offset + length); | |
2921 | ||
93d2269d MS |
2922 | if (changed && fc->writeback_cache) |
2923 | file_update_time(file); | |
b0aa7606 | 2924 | } |
bee6c307 BF |
2925 | |
2926 | if (mode & FALLOC_FL_PUNCH_HOLE) | |
2927 | truncate_pagecache_range(inode, offset, offset + length - 1); | |
2928 | ||
2929 | fuse_invalidate_attr(inode); | |
2930 | ||
3634a632 | 2931 | out: |
0ab08f57 MP |
2932 | if (!(mode & FALLOC_FL_KEEP_SIZE)) |
2933 | clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); | |
2934 | ||
bde52788 | 2935 | if (lock_inode) |
3634a632 | 2936 | mutex_unlock(&inode->i_mutex); |
3634a632 | 2937 | |
05ba1f08 AP |
2938 | return err; |
2939 | } | |
05ba1f08 | 2940 | |
4b6f5d20 | 2941 | static const struct file_operations fuse_file_operations = { |
5559b8f4 | 2942 | .llseek = fuse_file_llseek, |
37c20f16 | 2943 | .read_iter = fuse_file_read_iter, |
84c3d55c | 2944 | .write_iter = fuse_file_write_iter, |
b6aeaded MS |
2945 | .mmap = fuse_file_mmap, |
2946 | .open = fuse_open, | |
2947 | .flush = fuse_flush, | |
2948 | .release = fuse_release, | |
2949 | .fsync = fuse_fsync, | |
71421259 | 2950 | .lock = fuse_file_lock, |
a9ff4f87 | 2951 | .flock = fuse_file_flock, |
5ffc4ef4 | 2952 | .splice_read = generic_file_splice_read, |
59efec7b TH |
2953 | .unlocked_ioctl = fuse_file_ioctl, |
2954 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 2955 | .poll = fuse_file_poll, |
05ba1f08 | 2956 | .fallocate = fuse_file_fallocate, |
b6aeaded MS |
2957 | }; |
2958 | ||
4b6f5d20 | 2959 | static const struct file_operations fuse_direct_io_file_operations = { |
5559b8f4 | 2960 | .llseek = fuse_file_llseek, |
15316263 | 2961 | .read_iter = fuse_direct_read_iter, |
15316263 | 2962 | .write_iter = fuse_direct_write_iter, |
fc280c96 | 2963 | .mmap = fuse_direct_mmap, |
413ef8cb MS |
2964 | .open = fuse_open, |
2965 | .flush = fuse_flush, | |
2966 | .release = fuse_release, | |
2967 | .fsync = fuse_fsync, | |
71421259 | 2968 | .lock = fuse_file_lock, |
a9ff4f87 | 2969 | .flock = fuse_file_flock, |
59efec7b TH |
2970 | .unlocked_ioctl = fuse_file_ioctl, |
2971 | .compat_ioctl = fuse_file_compat_ioctl, | |
95668a69 | 2972 | .poll = fuse_file_poll, |
05ba1f08 | 2973 | .fallocate = fuse_file_fallocate, |
fc280c96 | 2974 | /* no splice_read */ |
413ef8cb MS |
2975 | }; |
2976 | ||
f5e54d6e | 2977 | static const struct address_space_operations fuse_file_aops = { |
b6aeaded | 2978 | .readpage = fuse_readpage, |
3be5a52b | 2979 | .writepage = fuse_writepage, |
26d614df | 2980 | .writepages = fuse_writepages, |
3be5a52b | 2981 | .launder_page = fuse_launder_page, |
db50b96c | 2982 | .readpages = fuse_readpages, |
3be5a52b | 2983 | .set_page_dirty = __set_page_dirty_nobuffers, |
b2d2272f | 2984 | .bmap = fuse_bmap, |
4273b793 | 2985 | .direct_IO = fuse_direct_IO, |
6b12c1b3 PE |
2986 | .write_begin = fuse_write_begin, |
2987 | .write_end = fuse_write_end, | |
b6aeaded MS |
2988 | }; |
2989 | ||
2990 | void fuse_init_file_inode(struct inode *inode) | |
2991 | { | |
45323fb7 MS |
2992 | inode->i_fop = &fuse_file_operations; |
2993 | inode->i_data.a_ops = &fuse_file_aops; | |
b6aeaded | 2994 | } |