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