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[MIPS] mtx-1: Remove unused mtx1_sys_btn.
[linux-2.6/btrfs-unstable.git] / fs / fuse / file.c
blob0fcdba9d47c090ba5b6dae59abfdc41897d5b7f1
1 /*
2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu>
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>
14 #include <linux/sched.h>
15
16 static const struct file_operations fuse_direct_io_file_operations;
17
18 static int fuse_send_open(struct inode *inode, struct file *file, int isdir,
19 struct fuse_open_out *outargp)
20 {
21 struct fuse_conn *fc = get_fuse_conn(inode);
22 struct fuse_open_in inarg;
23 struct fuse_req *req;
24 int err;
25
26 req = fuse_get_req(fc);
27 if (IS_ERR(req))
28 return PTR_ERR(req);
29
30 memset(&inarg, 0, sizeof(inarg));
31 inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY);
32 if (!fc->atomic_o_trunc)
33 inarg.flags &= ~O_TRUNC;
34 req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
35 req->in.h.nodeid = get_node_id(inode);
36 req->in.numargs = 1;
37 req->in.args[0].size = sizeof(inarg);
38 req->in.args[0].value = &inarg;
39 req->out.numargs = 1;
40 req->out.args[0].size = sizeof(*outargp);
41 req->out.args[0].value = outargp;
42 request_send(fc, req);
43 err = req->out.h.error;
44 fuse_put_request(fc, req);
45
46 return err;
47 }
48
49 struct fuse_file *fuse_file_alloc(void)
50 {
51 struct fuse_file *ff;
52 ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
53 if (ff) {
54 ff->reserved_req = fuse_request_alloc();
55 if (!ff->reserved_req) {
56 kfree(ff);
57 ff = NULL;
58 }
59 INIT_LIST_HEAD(&ff->write_entry);
60 atomic_set(&ff->count, 0);
61 }
62 return ff;
63 }
64
65 void fuse_file_free(struct fuse_file *ff)
66 {
67 fuse_request_free(ff->reserved_req);
68 kfree(ff);
69 }
70
71 static struct fuse_file *fuse_file_get(struct fuse_file *ff)
72 {
73 atomic_inc(&ff->count);
74 return ff;
75 }
76
77 static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req)
78 {
79 dput(req->dentry);
80 mntput(req->vfsmount);
81 fuse_put_request(fc, req);
82 }
83
84 static void fuse_file_put(struct fuse_file *ff)
85 {
86 if (atomic_dec_and_test(&ff->count)) {
87 struct fuse_req *req = ff->reserved_req;
88 struct fuse_conn *fc = get_fuse_conn(req->dentry->d_inode);
89 req->end = fuse_release_end;
90 request_send_background(fc, req);
91 kfree(ff);
92 }
93 }
94
95 void fuse_finish_open(struct inode *inode, struct file *file,
96 struct fuse_file *ff, struct fuse_open_out *outarg)
97 {
98 if (outarg->open_flags & FOPEN_DIRECT_IO)
99 file->f_op = &fuse_direct_io_file_operations;
100 if (!(outarg->open_flags & FOPEN_KEEP_CACHE))
101 invalidate_inode_pages2(inode->i_mapping);
102 ff->fh = outarg->fh;
103 file->private_data = fuse_file_get(ff);
104 }
105
106 int fuse_open_common(struct inode *inode, struct file *file, int isdir)
107 {
108 struct fuse_open_out outarg;
109 struct fuse_file *ff;
110 int err;
111
112 /* VFS checks this, but only _after_ ->open() */
113 if (file->f_flags & O_DIRECT)
114 return -EINVAL;
115
116 err = generic_file_open(inode, file);
117 if (err)
118 return err;
119
120 ff = fuse_file_alloc();
121 if (!ff)
122 return -ENOMEM;
123
124 err = fuse_send_open(inode, file, isdir, &outarg);
125 if (err)
126 fuse_file_free(ff);
127 else {
128 if (isdir)
129 outarg.open_flags &= ~FOPEN_DIRECT_IO;
130 fuse_finish_open(inode, file, ff, &outarg);
131 }
132
133 return err;
134 }
135
136 void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode)
137 {
138 struct fuse_req *req = ff->reserved_req;
139 struct fuse_release_in *inarg = &req->misc.release_in;
140
141 inarg->fh = ff->fh;
142 inarg->flags = flags;
143 req->in.h.opcode = opcode;
144 req->in.h.nodeid = nodeid;
145 req->in.numargs = 1;
146 req->in.args[0].size = sizeof(struct fuse_release_in);
147 req->in.args[0].value = inarg;
148 }
149
150 int fuse_release_common(struct inode *inode, struct file *file, int isdir)
151 {
152 struct fuse_file *ff = file->private_data;
153 if (ff) {
154 struct fuse_conn *fc = get_fuse_conn(inode);
155
156 fuse_release_fill(ff, get_node_id(inode), file->f_flags,
157 isdir ? FUSE_RELEASEDIR : FUSE_RELEASE);
158
159 /* Hold vfsmount and dentry until release is finished */
160 ff->reserved_req->vfsmount = mntget(file->f_path.mnt);
161 ff->reserved_req->dentry = dget(file->f_path.dentry);
162
163 spin_lock(&fc->lock);
164 list_del(&ff->write_entry);
165 spin_unlock(&fc->lock);
166 /*
167 * Normally this will send the RELEASE request,
168 * however if some asynchronous READ or WRITE requests
169 * are outstanding, the sending will be delayed
170 */
171 fuse_file_put(ff);
172 }
173
174 /* Return value is ignored by VFS */
175 return 0;
176 }
177
178 static int fuse_open(struct inode *inode, struct file *file)
179 {
180 return fuse_open_common(inode, file, 0);
181 }
182
183 static int fuse_release(struct inode *inode, struct file *file)
184 {
185 return fuse_release_common(inode, file, 0);
186 }
187
188 /*
189 * Scramble the ID space with XTEA, so that the value of the files_struct
190 * pointer is not exposed to userspace.
191 */
192 u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
193 {
194 u32 *k = fc->scramble_key;
195 u64 v = (unsigned long) id;
196 u32 v0 = v;
197 u32 v1 = v >> 32;
198 u32 sum = 0;
199 int i;
200
201 for (i = 0; i < 32; i++) {
202 v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]);
203 sum += 0x9E3779B9;
204 v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]);
205 }
206
207 return (u64) v0 + ((u64) v1 << 32);
208 }
209
210 static int fuse_flush(struct file *file, fl_owner_t id)
211 {
212 struct inode *inode = file->f_path.dentry->d_inode;
213 struct fuse_conn *fc = get_fuse_conn(inode);
214 struct fuse_file *ff = file->private_data;
215 struct fuse_req *req;
216 struct fuse_flush_in inarg;
217 int err;
218
219 if (is_bad_inode(inode))
220 return -EIO;
221
222 if (fc->no_flush)
223 return 0;
224
225 req = fuse_get_req_nofail(fc, file);
226 memset(&inarg, 0, sizeof(inarg));
227 inarg.fh = ff->fh;
228 inarg.lock_owner = fuse_lock_owner_id(fc, id);
229 req->in.h.opcode = FUSE_FLUSH;
230 req->in.h.nodeid = get_node_id(inode);
231 req->in.numargs = 1;
232 req->in.args[0].size = sizeof(inarg);
233 req->in.args[0].value = &inarg;
234 req->force = 1;
235 request_send(fc, req);
236 err = req->out.h.error;
237 fuse_put_request(fc, req);
238 if (err == -ENOSYS) {
239 fc->no_flush = 1;
240 err = 0;
241 }
242 return err;
243 }
244
245 int fuse_fsync_common(struct file *file, struct dentry *de, int datasync,
246 int isdir)
247 {
248 struct inode *inode = de->d_inode;
249 struct fuse_conn *fc = get_fuse_conn(inode);
250 struct fuse_file *ff = file->private_data;
251 struct fuse_req *req;
252 struct fuse_fsync_in inarg;
253 int err;
254
255 if (is_bad_inode(inode))
256 return -EIO;
257
258 if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
259 return 0;
260
261 req = fuse_get_req(fc);
262 if (IS_ERR(req))
263 return PTR_ERR(req);
264
265 memset(&inarg, 0, sizeof(inarg));
266 inarg.fh = ff->fh;
267 inarg.fsync_flags = datasync ? 1 : 0;
268 req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC;
269 req->in.h.nodeid = get_node_id(inode);
270 req->in.numargs = 1;
271 req->in.args[0].size = sizeof(inarg);
272 req->in.args[0].value = &inarg;
273 request_send(fc, req);
274 err = req->out.h.error;
275 fuse_put_request(fc, req);
276 if (err == -ENOSYS) {
277 if (isdir)
278 fc->no_fsyncdir = 1;
279 else
280 fc->no_fsync = 1;
281 err = 0;
282 }
283 return err;
284 }
285
286 static int fuse_fsync(struct file *file, struct dentry *de, int datasync)
287 {
288 return fuse_fsync_common(file, de, datasync, 0);
289 }
290
291 void fuse_read_fill(struct fuse_req *req, struct fuse_file *ff,
292 struct inode *inode, loff_t pos, size_t count, int opcode)
293 {
294 struct fuse_read_in *inarg = &req->misc.read_in;
295
296 inarg->fh = ff->fh;
297 inarg->offset = pos;
298 inarg->size = count;
299 req->in.h.opcode = opcode;
300 req->in.h.nodeid = get_node_id(inode);
301 req->in.numargs = 1;
302 req->in.args[0].size = sizeof(struct fuse_read_in);
303 req->in.args[0].value = inarg;
304 req->out.argpages = 1;
305 req->out.argvar = 1;
306 req->out.numargs = 1;
307 req->out.args[0].size = count;
308 }
309
310 static size_t fuse_send_read(struct fuse_req *req, struct file *file,
311 struct inode *inode, loff_t pos, size_t count,
312 fl_owner_t owner)
313 {
314 struct fuse_conn *fc = get_fuse_conn(inode);
315 struct fuse_file *ff = file->private_data;
316
317 fuse_read_fill(req, ff, inode, pos, count, FUSE_READ);
318 if (owner != NULL) {
319 struct fuse_read_in *inarg = &req->misc.read_in;
320
321 inarg->read_flags |= FUSE_READ_LOCKOWNER;
322 inarg->lock_owner = fuse_lock_owner_id(fc, owner);
323 }
324 request_send(fc, req);
325 return req->out.args[0].size;
326 }
327
328 static int fuse_readpage(struct file *file, struct page *page)
329 {
330 struct inode *inode = page->mapping->host;
331 struct fuse_conn *fc = get_fuse_conn(inode);
332 struct fuse_req *req;
333 int err;
334
335 err = -EIO;
336 if (is_bad_inode(inode))
337 goto out;
338
339 req = fuse_get_req(fc);
340 err = PTR_ERR(req);
341 if (IS_ERR(req))
342 goto out;
343
344 req->out.page_zeroing = 1;
345 req->num_pages = 1;
346 req->pages[0] = page;
347 fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE,
348 NULL);
349 err = req->out.h.error;
350 fuse_put_request(fc, req);
351 if (!err)
352 SetPageUptodate(page);
353 fuse_invalidate_attr(inode); /* atime changed */
354 out:
355 unlock_page(page);
356 return err;
357 }
358
359 static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
360 {
361 int i;
362
363 fuse_invalidate_attr(req->pages[0]->mapping->host); /* atime changed */
364
365 for (i = 0; i < req->num_pages; i++) {
366 struct page *page = req->pages[i];
367 if (!req->out.h.error)
368 SetPageUptodate(page);
369 else
370 SetPageError(page);
371 unlock_page(page);
372 }
373 if (req->ff)
374 fuse_file_put(req->ff);
375 fuse_put_request(fc, req);
376 }
377
378 static void fuse_send_readpages(struct fuse_req *req, struct fuse_file *ff,
379 struct inode *inode)
380 {
381 struct fuse_conn *fc = get_fuse_conn(inode);
382 loff_t pos = page_offset(req->pages[0]);
383 size_t count = req->num_pages << PAGE_CACHE_SHIFT;
384 req->out.page_zeroing = 1;
385 fuse_read_fill(req, ff, inode, pos, count, FUSE_READ);
386 if (fc->async_read) {
387 req->ff = fuse_file_get(ff);
388 req->end = fuse_readpages_end;
389 request_send_background(fc, req);
390 } else {
391 request_send(fc, req);
392 fuse_readpages_end(fc, req);
393 }
394 }
395
396 struct fuse_fill_data {
397 struct fuse_req *req;
398 struct fuse_file *ff;
399 struct inode *inode;
400 };
401
402 static int fuse_readpages_fill(void *_data, struct page *page)
403 {
404 struct fuse_fill_data *data = _data;
405 struct fuse_req *req = data->req;
406 struct inode *inode = data->inode;
407 struct fuse_conn *fc = get_fuse_conn(inode);
408
409 if (req->num_pages &&
410 (req->num_pages == FUSE_MAX_PAGES_PER_REQ ||
411 (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read ||
412 req->pages[req->num_pages - 1]->index + 1 != page->index)) {
413 fuse_send_readpages(req, data->ff, inode);
414 data->req = req = fuse_get_req(fc);
415 if (IS_ERR(req)) {
416 unlock_page(page);
417 return PTR_ERR(req);
418 }
419 }
420 req->pages[req->num_pages] = page;
421 req->num_pages ++;
422 return 0;
423 }
424
425 static int fuse_readpages(struct file *file, struct address_space *mapping,
426 struct list_head *pages, unsigned nr_pages)
427 {
428 struct inode *inode = mapping->host;
429 struct fuse_conn *fc = get_fuse_conn(inode);
430 struct fuse_fill_data data;
431 int err;
432
433 err = -EIO;
434 if (is_bad_inode(inode))
435 goto out;
436
437 data.ff = file->private_data;
438 data.inode = inode;
439 data.req = fuse_get_req(fc);
440 err = PTR_ERR(data.req);
441 if (IS_ERR(data.req))
442 goto out;
443
444 err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
445 if (!err) {
446 if (data.req->num_pages)
447 fuse_send_readpages(data.req, data.ff, inode);
448 else
449 fuse_put_request(fc, data.req);
450 }
451 out:
452 return err;
453 }
454
455 static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff,
456 struct inode *inode, loff_t pos, size_t count,
457 int writepage)
458 {
459 struct fuse_conn *fc = get_fuse_conn(inode);
460 struct fuse_write_in *inarg = &req->misc.write.in;
461 struct fuse_write_out *outarg = &req->misc.write.out;
462
463 memset(inarg, 0, sizeof(struct fuse_write_in));
464 inarg->fh = ff->fh;
465 inarg->offset = pos;
466 inarg->size = count;
467 inarg->write_flags = writepage ? FUSE_WRITE_CACHE : 0;
468 req->in.h.opcode = FUSE_WRITE;
469 req->in.h.nodeid = get_node_id(inode);
470 req->in.argpages = 1;
471 req->in.numargs = 2;
472 if (fc->minor < 9)
473 req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE;
474 else
475 req->in.args[0].size = sizeof(struct fuse_write_in);
476 req->in.args[0].value = inarg;
477 req->in.args[1].size = count;
478 req->out.numargs = 1;
479 req->out.args[0].size = sizeof(struct fuse_write_out);
480 req->out.args[0].value = outarg;
481 }
482
483 static size_t fuse_send_write(struct fuse_req *req, struct file *file,
484 struct inode *inode, loff_t pos, size_t count,
485 fl_owner_t owner)
486 {
487 struct fuse_conn *fc = get_fuse_conn(inode);
488 fuse_write_fill(req, file->private_data, inode, pos, count, 0);
489 if (owner != NULL) {
490 struct fuse_write_in *inarg = &req->misc.write.in;
491 inarg->write_flags |= FUSE_WRITE_LOCKOWNER;
492 inarg->lock_owner = fuse_lock_owner_id(fc, owner);
493 }
494 request_send(fc, req);
495 return req->misc.write.out.size;
496 }
497
498 static int fuse_write_begin(struct file *file, struct address_space *mapping,
499 loff_t pos, unsigned len, unsigned flags,
500 struct page **pagep, void **fsdata)
501 {
502 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
503
504 *pagep = __grab_cache_page(mapping, index);
505 if (!*pagep)
506 return -ENOMEM;
507 return 0;
508 }
509
510 static int fuse_buffered_write(struct file *file, struct inode *inode,
511 loff_t pos, unsigned count, struct page *page)
512 {
513 int err;
514 size_t nres;
515 struct fuse_conn *fc = get_fuse_conn(inode);
516 struct fuse_inode *fi = get_fuse_inode(inode);
517 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
518 struct fuse_req *req;
519
520 if (is_bad_inode(inode))
521 return -EIO;
522
523 req = fuse_get_req(fc);
524 if (IS_ERR(req))
525 return PTR_ERR(req);
526
527 req->num_pages = 1;
528 req->pages[0] = page;
529 req->page_offset = offset;
530 nres = fuse_send_write(req, file, inode, pos, count, NULL);
531 err = req->out.h.error;
532 fuse_put_request(fc, req);
533 if (!err && !nres)
534 err = -EIO;
535 if (!err) {
536 pos += nres;
537 spin_lock(&fc->lock);
538 fi->attr_version = ++fc->attr_version;
539 if (pos > inode->i_size)
540 i_size_write(inode, pos);
541 spin_unlock(&fc->lock);
542
543 if (count == PAGE_CACHE_SIZE)
544 SetPageUptodate(page);
545 }
546 fuse_invalidate_attr(inode);
547 return err ? err : nres;
548 }
549
550 static int fuse_write_end(struct file *file, struct address_space *mapping,
551 loff_t pos, unsigned len, unsigned copied,
552 struct page *page, void *fsdata)
553 {
554 struct inode *inode = mapping->host;
555 int res = 0;
556
557 if (copied)
558 res = fuse_buffered_write(file, inode, pos, copied, page);
559
560 unlock_page(page);
561 page_cache_release(page);
562 return res;
563 }
564
565 static void fuse_release_user_pages(struct fuse_req *req, int write)
566 {
567 unsigned i;
568
569 for (i = 0; i < req->num_pages; i++) {
570 struct page *page = req->pages[i];
571 if (write)
572 set_page_dirty_lock(page);
573 put_page(page);
574 }
575 }
576
577 static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
578 unsigned nbytes, int write)
579 {
580 unsigned long user_addr = (unsigned long) buf;
581 unsigned offset = user_addr & ~PAGE_MASK;
582 int npages;
583
584 /* This doesn't work with nfsd */
585 if (!current->mm)
586 return -EPERM;
587
588 nbytes = min(nbytes, (unsigned) FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT);
589 npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
590 npages = min(max(npages, 1), FUSE_MAX_PAGES_PER_REQ);
591 down_read(&current->mm->mmap_sem);
592 npages = get_user_pages(current, current->mm, user_addr, npages, write,
593 0, req->pages, NULL);
594 up_read(&current->mm->mmap_sem);
595 if (npages < 0)
596 return npages;
597
598 req->num_pages = npages;
599 req->page_offset = offset;
600 return 0;
601 }
602
603 static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
604 size_t count, loff_t *ppos, int write)
605 {
606 struct inode *inode = file->f_path.dentry->d_inode;
607 struct fuse_conn *fc = get_fuse_conn(inode);
608 size_t nmax = write ? fc->max_write : fc->max_read;
609 loff_t pos = *ppos;
610 ssize_t res = 0;
611 struct fuse_req *req;
612
613 if (is_bad_inode(inode))
614 return -EIO;
615
616 req = fuse_get_req(fc);
617 if (IS_ERR(req))
618 return PTR_ERR(req);
619
620 while (count) {
621 size_t nres;
622 size_t nbytes = min(count, nmax);
623 int err = fuse_get_user_pages(req, buf, nbytes, !write);
624 if (err) {
625 res = err;
626 break;
627 }
628 nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
629 nbytes = min(count, nbytes);
630 if (write)
631 nres = fuse_send_write(req, file, inode, pos, nbytes,
632 current->files);
633 else
634 nres = fuse_send_read(req, file, inode, pos, nbytes,
635 current->files);
636 fuse_release_user_pages(req, !write);
637 if (req->out.h.error) {
638 if (!res)
639 res = req->out.h.error;
640 break;
641 } else if (nres > nbytes) {
642 res = -EIO;
643 break;
644 }
645 count -= nres;
646 res += nres;
647 pos += nres;
648 buf += nres;
649 if (nres != nbytes)
650 break;
651 if (count) {
652 fuse_put_request(fc, req);
653 req = fuse_get_req(fc);
654 if (IS_ERR(req))
655 break;
656 }
657 }
658 fuse_put_request(fc, req);
659 if (res > 0) {
660 if (write) {
661 spin_lock(&fc->lock);
662 if (pos > inode->i_size)
663 i_size_write(inode, pos);
664 spin_unlock(&fc->lock);
665 }
666 *ppos = pos;
667 }
668 fuse_invalidate_attr(inode);
669
670 return res;
671 }
672
673 static ssize_t fuse_direct_read(struct file *file, char __user *buf,
674 size_t count, loff_t *ppos)
675 {
676 return fuse_direct_io(file, buf, count, ppos, 0);
677 }
678
679 static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
680 size_t count, loff_t *ppos)
681 {
682 struct inode *inode = file->f_path.dentry->d_inode;
683 ssize_t res;
684 /* Don't allow parallel writes to the same file */
685 mutex_lock(&inode->i_mutex);
686 res = generic_write_checks(file, ppos, &count, 0);
687 if (!res)
688 res = fuse_direct_io(file, buf, count, ppos, 1);
689 mutex_unlock(&inode->i_mutex);
690 return res;
691 }
692
693 static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
694 {
695 if ((vma->vm_flags & VM_SHARED)) {
696 if ((vma->vm_flags & VM_WRITE))
697 return -ENODEV;
698 else
699 vma->vm_flags &= ~VM_MAYWRITE;
700 }
701 return generic_file_mmap(file, vma);
702 }
703
704 static int fuse_set_page_dirty(struct page *page)
705 {
706 printk("fuse_set_page_dirty: should not happen\n");
707 dump_stack();
708 return 0;
709 }
710
711 static int convert_fuse_file_lock(const struct fuse_file_lock *ffl,
712 struct file_lock *fl)
713 {
714 switch (ffl->type) {
715 case F_UNLCK:
716 break;
717
718 case F_RDLCK:
719 case F_WRLCK:
720 if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX ||
721 ffl->end < ffl->start)
722 return -EIO;
723
724 fl->fl_start = ffl->start;
725 fl->fl_end = ffl->end;
726 fl->fl_pid = ffl->pid;
727 break;
728
729 default:
730 return -EIO;
731 }
732 fl->fl_type = ffl->type;
733 return 0;
734 }
735
736 static void fuse_lk_fill(struct fuse_req *req, struct file *file,
737 const struct file_lock *fl, int opcode, pid_t pid,
738 int flock)
739 {
740 struct inode *inode = file->f_path.dentry->d_inode;
741 struct fuse_conn *fc = get_fuse_conn(inode);
742 struct fuse_file *ff = file->private_data;
743 struct fuse_lk_in *arg = &req->misc.lk_in;
744
745 arg->fh = ff->fh;
746 arg->owner = fuse_lock_owner_id(fc, fl->fl_owner);
747 arg->lk.start = fl->fl_start;
748 arg->lk.end = fl->fl_end;
749 arg->lk.type = fl->fl_type;
750 arg->lk.pid = pid;
751 if (flock)
752 arg->lk_flags |= FUSE_LK_FLOCK;
753 req->in.h.opcode = opcode;
754 req->in.h.nodeid = get_node_id(inode);
755 req->in.numargs = 1;
756 req->in.args[0].size = sizeof(*arg);
757 req->in.args[0].value = arg;
758 }
759
760 static int fuse_getlk(struct file *file, struct file_lock *fl)
761 {
762 struct inode *inode = file->f_path.dentry->d_inode;
763 struct fuse_conn *fc = get_fuse_conn(inode);
764 struct fuse_req *req;
765 struct fuse_lk_out outarg;
766 int err;
767
768 req = fuse_get_req(fc);
769 if (IS_ERR(req))
770 return PTR_ERR(req);
771
772 fuse_lk_fill(req, file, fl, FUSE_GETLK, 0, 0);
773 req->out.numargs = 1;
774 req->out.args[0].size = sizeof(outarg);
775 req->out.args[0].value = &outarg;
776 request_send(fc, req);
777 err = req->out.h.error;
778 fuse_put_request(fc, req);
779 if (!err)
780 err = convert_fuse_file_lock(&outarg.lk, fl);
781
782 return err;
783 }
784
785 static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
786 {
787 struct inode *inode = file->f_path.dentry->d_inode;
788 struct fuse_conn *fc = get_fuse_conn(inode);
789 struct fuse_req *req;
790 int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK;
791 pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0;
792 int err;
793
794 /* Unlock on close is handled by the flush method */
795 if (fl->fl_flags & FL_CLOSE)
796 return 0;
797
798 req = fuse_get_req(fc);
799 if (IS_ERR(req))
800 return PTR_ERR(req);
801
802 fuse_lk_fill(req, file, fl, opcode, pid, flock);
803 request_send(fc, req);
804 err = req->out.h.error;
805 /* locking is restartable */
806 if (err == -EINTR)
807 err = -ERESTARTSYS;
808 fuse_put_request(fc, req);
809 return err;
810 }
811
812 static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
813 {
814 struct inode *inode = file->f_path.dentry->d_inode;
815 struct fuse_conn *fc = get_fuse_conn(inode);
816 int err;
817
818 if (cmd == F_GETLK) {
819 if (fc->no_lock) {
820 posix_test_lock(file, fl);
821 err = 0;
822 } else
823 err = fuse_getlk(file, fl);
824 } else {
825 if (fc->no_lock)
826 err = posix_lock_file_wait(file, fl);
827 else
828 err = fuse_setlk(file, fl, 0);
829 }
830 return err;
831 }
832
833 static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl)
834 {
835 struct inode *inode = file->f_path.dentry->d_inode;
836 struct fuse_conn *fc = get_fuse_conn(inode);
837 int err;
838
839 if (fc->no_lock) {
840 err = flock_lock_file_wait(file, fl);
841 } else {
842 /* emulate flock with POSIX locks */
843 fl->fl_owner = (fl_owner_t) file;
844 err = fuse_setlk(file, fl, 1);
845 }
846
847 return err;
848 }
849
850 static sector_t fuse_bmap(struct address_space *mapping, sector_t block)
851 {
852 struct inode *inode = mapping->host;
853 struct fuse_conn *fc = get_fuse_conn(inode);
854 struct fuse_req *req;
855 struct fuse_bmap_in inarg;
856 struct fuse_bmap_out outarg;
857 int err;
858
859 if (!inode->i_sb->s_bdev || fc->no_bmap)
860 return 0;
861
862 req = fuse_get_req(fc);
863 if (IS_ERR(req))
864 return 0;
865
866 memset(&inarg, 0, sizeof(inarg));
867 inarg.block = block;
868 inarg.blocksize = inode->i_sb->s_blocksize;
869 req->in.h.opcode = FUSE_BMAP;
870 req->in.h.nodeid = get_node_id(inode);
871 req->in.numargs = 1;
872 req->in.args[0].size = sizeof(inarg);
873 req->in.args[0].value = &inarg;
874 req->out.numargs = 1;
875 req->out.args[0].size = sizeof(outarg);
876 req->out.args[0].value = &outarg;
877 request_send(fc, req);
878 err = req->out.h.error;
879 fuse_put_request(fc, req);
880 if (err == -ENOSYS)
881 fc->no_bmap = 1;
882
883 return err ? 0 : outarg.block;
884 }
885
886 static const struct file_operations fuse_file_operations = {
887 .llseek = generic_file_llseek,
888 .read = do_sync_read,
889 .aio_read = generic_file_aio_read,
890 .write = do_sync_write,
891 .aio_write = generic_file_aio_write,
892 .mmap = fuse_file_mmap,
893 .open = fuse_open,
894 .flush = fuse_flush,
895 .release = fuse_release,
896 .fsync = fuse_fsync,
897 .lock = fuse_file_lock,
898 .flock = fuse_file_flock,
899 .splice_read = generic_file_splice_read,
900 };
901
902 static const struct file_operations fuse_direct_io_file_operations = {
903 .llseek = generic_file_llseek,
904 .read = fuse_direct_read,
905 .write = fuse_direct_write,
906 .open = fuse_open,
907 .flush = fuse_flush,
908 .release = fuse_release,
909 .fsync = fuse_fsync,
910 .lock = fuse_file_lock,
911 .flock = fuse_file_flock,
912 /* no mmap and splice_read */
913 };
914
915 static const struct address_space_operations fuse_file_aops = {
916 .readpage = fuse_readpage,
917 .write_begin = fuse_write_begin,
918 .write_end = fuse_write_end,
919 .readpages = fuse_readpages,
920 .set_page_dirty = fuse_set_page_dirty,
921 .bmap = fuse_bmap,
922 };
923
924 void fuse_init_file_inode(struct inode *inode)
925 {
926 inode->i_fop = &fuse_file_operations;
927 inode->i_data.a_ops = &fuse_file_aops;
928 }
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