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[WATCHDOG] watchdog miscdevice patch
[linux-2.6/libata-dev.git] / fs / fuse / file.c
blob128f79c40803fb43381da3d56370c74b3a5bff48
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
15 static const struct file_operations fuse_direct_io_file_operations;
16
17 static int fuse_send_open(struct inode *inode, struct file *file, int isdir,
18 struct fuse_open_out *outargp)
19 {
20 struct fuse_conn *fc = get_fuse_conn(inode);
21 struct fuse_open_in inarg;
22 struct fuse_req *req;
23 int err;
24
25 req = fuse_get_req(fc);
26 if (IS_ERR(req))
27 return PTR_ERR(req);
28
29 memset(&inarg, 0, sizeof(inarg));
30 inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
31 req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
32 req->in.h.nodeid = get_node_id(inode);
33 req->in.numargs = 1;
34 req->in.args[0].size = sizeof(inarg);
35 req->in.args[0].value = &inarg;
36 req->out.numargs = 1;
37 req->out.args[0].size = sizeof(*outargp);
38 req->out.args[0].value = outargp;
39 request_send(fc, req);
40 err = req->out.h.error;
41 fuse_put_request(fc, req);
42
43 return err;
44 }
45
46 struct fuse_file *fuse_file_alloc(void)
47 {
48 struct fuse_file *ff;
49 ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
50 if (ff) {
51 ff->reserved_req = fuse_request_alloc();
52 if (!ff->reserved_req) {
53 kfree(ff);
54 ff = NULL;
55 }
56 }
57 return ff;
58 }
59
60 void fuse_file_free(struct fuse_file *ff)
61 {
62 fuse_request_free(ff->reserved_req);
63 kfree(ff);
64 }
65
66 void fuse_finish_open(struct inode *inode, struct file *file,
67 struct fuse_file *ff, struct fuse_open_out *outarg)
68 {
69 if (outarg->open_flags & FOPEN_DIRECT_IO)
70 file->f_op = &fuse_direct_io_file_operations;
71 if (!(outarg->open_flags & FOPEN_KEEP_CACHE))
72 invalidate_inode_pages(inode->i_mapping);
73 ff->fh = outarg->fh;
74 file->private_data = ff;
75 }
76
77 int fuse_open_common(struct inode *inode, struct file *file, int isdir)
78 {
79 struct fuse_open_out outarg;
80 struct fuse_file *ff;
81 int err;
82
83 /* VFS checks this, but only _after_ ->open() */
84 if (file->f_flags & O_DIRECT)
85 return -EINVAL;
86
87 err = generic_file_open(inode, file);
88 if (err)
89 return err;
90
91 /* If opening the root node, no lookup has been performed on
92 it, so the attributes must be refreshed */
93 if (get_node_id(inode) == FUSE_ROOT_ID) {
94 err = fuse_do_getattr(inode);
95 if (err)
96 return err;
97 }
98
99 ff = fuse_file_alloc();
100 if (!ff)
101 return -ENOMEM;
102
103 err = fuse_send_open(inode, file, isdir, &outarg);
104 if (err)
105 fuse_file_free(ff);
106 else {
107 if (isdir)
108 outarg.open_flags &= ~FOPEN_DIRECT_IO;
109 fuse_finish_open(inode, file, ff, &outarg);
110 }
111
112 return err;
113 }
114
115 struct fuse_req *fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags,
116 int opcode)
117 {
118 struct fuse_req *req = ff->reserved_req;
119 struct fuse_release_in *inarg = &req->misc.release_in;
120
121 inarg->fh = ff->fh;
122 inarg->flags = flags;
123 req->in.h.opcode = opcode;
124 req->in.h.nodeid = nodeid;
125 req->in.numargs = 1;
126 req->in.args[0].size = sizeof(struct fuse_release_in);
127 req->in.args[0].value = inarg;
128 kfree(ff);
129
130 return req;
131 }
132
133 int fuse_release_common(struct inode *inode, struct file *file, int isdir)
134 {
135 struct fuse_file *ff = file->private_data;
136 if (ff) {
137 struct fuse_conn *fc = get_fuse_conn(inode);
138 struct fuse_req *req;
139
140 req = fuse_release_fill(ff, get_node_id(inode), file->f_flags,
141 isdir ? FUSE_RELEASEDIR : FUSE_RELEASE);
142
143 /* Hold vfsmount and dentry until release is finished */
144 req->vfsmount = mntget(file->f_vfsmnt);
145 req->dentry = dget(file->f_dentry);
146 request_send_background(fc, req);
147 }
148
149 /* Return value is ignored by VFS */
150 return 0;
151 }
152
153 static int fuse_open(struct inode *inode, struct file *file)
154 {
155 return fuse_open_common(inode, file, 0);
156 }
157
158 static int fuse_release(struct inode *inode, struct file *file)
159 {
160 return fuse_release_common(inode, file, 0);
161 }
162
163 /*
164 * Scramble the ID space with XTEA, so that the value of the files_struct
165 * pointer is not exposed to userspace.
166 */
167 static u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
168 {
169 u32 *k = fc->scramble_key;
170 u64 v = (unsigned long) id;
171 u32 v0 = v;
172 u32 v1 = v >> 32;
173 u32 sum = 0;
174 int i;
175
176 for (i = 0; i < 32; i++) {
177 v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]);
178 sum += 0x9E3779B9;
179 v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]);
180 }
181
182 return (u64) v0 + ((u64) v1 << 32);
183 }
184
185 static int fuse_flush(struct file *file, fl_owner_t id)
186 {
187 struct inode *inode = file->f_dentry->d_inode;
188 struct fuse_conn *fc = get_fuse_conn(inode);
189 struct fuse_file *ff = file->private_data;
190 struct fuse_req *req;
191 struct fuse_flush_in inarg;
192 int err;
193
194 if (is_bad_inode(inode))
195 return -EIO;
196
197 if (fc->no_flush)
198 return 0;
199
200 req = fuse_get_req_nofail(fc, file);
201 memset(&inarg, 0, sizeof(inarg));
202 inarg.fh = ff->fh;
203 inarg.lock_owner = fuse_lock_owner_id(fc, id);
204 req->in.h.opcode = FUSE_FLUSH;
205 req->in.h.nodeid = get_node_id(inode);
206 req->in.numargs = 1;
207 req->in.args[0].size = sizeof(inarg);
208 req->in.args[0].value = &inarg;
209 req->force = 1;
210 request_send(fc, req);
211 err = req->out.h.error;
212 fuse_put_request(fc, req);
213 if (err == -ENOSYS) {
214 fc->no_flush = 1;
215 err = 0;
216 }
217 return err;
218 }
219
220 int fuse_fsync_common(struct file *file, struct dentry *de, int datasync,
221 int isdir)
222 {
223 struct inode *inode = de->d_inode;
224 struct fuse_conn *fc = get_fuse_conn(inode);
225 struct fuse_file *ff = file->private_data;
226 struct fuse_req *req;
227 struct fuse_fsync_in inarg;
228 int err;
229
230 if (is_bad_inode(inode))
231 return -EIO;
232
233 if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
234 return 0;
235
236 req = fuse_get_req(fc);
237 if (IS_ERR(req))
238 return PTR_ERR(req);
239
240 memset(&inarg, 0, sizeof(inarg));
241 inarg.fh = ff->fh;
242 inarg.fsync_flags = datasync ? 1 : 0;
243 req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC;
244 req->in.h.nodeid = get_node_id(inode);
245 req->in.numargs = 1;
246 req->in.args[0].size = sizeof(inarg);
247 req->in.args[0].value = &inarg;
248 request_send(fc, req);
249 err = req->out.h.error;
250 fuse_put_request(fc, req);
251 if (err == -ENOSYS) {
252 if (isdir)
253 fc->no_fsyncdir = 1;
254 else
255 fc->no_fsync = 1;
256 err = 0;
257 }
258 return err;
259 }
260
261 static int fuse_fsync(struct file *file, struct dentry *de, int datasync)
262 {
263 return fuse_fsync_common(file, de, datasync, 0);
264 }
265
266 void fuse_read_fill(struct fuse_req *req, struct file *file,
267 struct inode *inode, loff_t pos, size_t count, int opcode)
268 {
269 struct fuse_file *ff = file->private_data;
270 struct fuse_read_in *inarg = &req->misc.read_in;
271
272 inarg->fh = ff->fh;
273 inarg->offset = pos;
274 inarg->size = count;
275 req->in.h.opcode = opcode;
276 req->in.h.nodeid = get_node_id(inode);
277 req->in.numargs = 1;
278 req->in.args[0].size = sizeof(struct fuse_read_in);
279 req->in.args[0].value = inarg;
280 req->out.argpages = 1;
281 req->out.argvar = 1;
282 req->out.numargs = 1;
283 req->out.args[0].size = count;
284 }
285
286 static size_t fuse_send_read(struct fuse_req *req, struct file *file,
287 struct inode *inode, loff_t pos, size_t count)
288 {
289 struct fuse_conn *fc = get_fuse_conn(inode);
290 fuse_read_fill(req, file, inode, pos, count, FUSE_READ);
291 request_send(fc, req);
292 return req->out.args[0].size;
293 }
294
295 static int fuse_readpage(struct file *file, struct page *page)
296 {
297 struct inode *inode = page->mapping->host;
298 struct fuse_conn *fc = get_fuse_conn(inode);
299 struct fuse_req *req;
300 int err;
301
302 err = -EIO;
303 if (is_bad_inode(inode))
304 goto out;
305
306 req = fuse_get_req(fc);
307 err = PTR_ERR(req);
308 if (IS_ERR(req))
309 goto out;
310
311 req->out.page_zeroing = 1;
312 req->num_pages = 1;
313 req->pages[0] = page;
314 fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE);
315 err = req->out.h.error;
316 fuse_put_request(fc, req);
317 if (!err)
318 SetPageUptodate(page);
319 fuse_invalidate_attr(inode); /* atime changed */
320 out:
321 unlock_page(page);
322 return err;
323 }
324
325 static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
326 {
327 int i;
328
329 fuse_invalidate_attr(req->pages[0]->mapping->host); /* atime changed */
330
331 for (i = 0; i < req->num_pages; i++) {
332 struct page *page = req->pages[i];
333 if (!req->out.h.error)
334 SetPageUptodate(page);
335 else
336 SetPageError(page);
337 unlock_page(page);
338 }
339 fuse_put_request(fc, req);
340 }
341
342 static void fuse_send_readpages(struct fuse_req *req, struct file *file,
343 struct inode *inode)
344 {
345 struct fuse_conn *fc = get_fuse_conn(inode);
346 loff_t pos = page_offset(req->pages[0]);
347 size_t count = req->num_pages << PAGE_CACHE_SHIFT;
348 req->out.page_zeroing = 1;
349 fuse_read_fill(req, file, inode, pos, count, FUSE_READ);
350 if (fc->async_read) {
351 get_file(file);
352 req->file = file;
353 req->end = fuse_readpages_end;
354 request_send_background(fc, req);
355 } else {
356 request_send(fc, req);
357 fuse_readpages_end(fc, req);
358 }
359 }
360
361 struct fuse_readpages_data {
362 struct fuse_req *req;
363 struct file *file;
364 struct inode *inode;
365 };
366
367 static int fuse_readpages_fill(void *_data, struct page *page)
368 {
369 struct fuse_readpages_data *data = _data;
370 struct fuse_req *req = data->req;
371 struct inode *inode = data->inode;
372 struct fuse_conn *fc = get_fuse_conn(inode);
373
374 if (req->num_pages &&
375 (req->num_pages == FUSE_MAX_PAGES_PER_REQ ||
376 (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read ||
377 req->pages[req->num_pages - 1]->index + 1 != page->index)) {
378 fuse_send_readpages(req, data->file, inode);
379 data->req = req = fuse_get_req(fc);
380 if (IS_ERR(req)) {
381 unlock_page(page);
382 return PTR_ERR(req);
383 }
384 }
385 req->pages[req->num_pages] = page;
386 req->num_pages ++;
387 return 0;
388 }
389
390 static int fuse_readpages(struct file *file, struct address_space *mapping,
391 struct list_head *pages, unsigned nr_pages)
392 {
393 struct inode *inode = mapping->host;
394 struct fuse_conn *fc = get_fuse_conn(inode);
395 struct fuse_readpages_data data;
396 int err;
397
398 err = -EIO;
399 if (is_bad_inode(inode))
400 goto out;
401
402 data.file = file;
403 data.inode = inode;
404 data.req = fuse_get_req(fc);
405 err = PTR_ERR(data.req);
406 if (IS_ERR(data.req))
407 goto out;
408
409 err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);
410 if (!err) {
411 if (data.req->num_pages)
412 fuse_send_readpages(data.req, file, inode);
413 else
414 fuse_put_request(fc, data.req);
415 }
416 out:
417 return err;
418 }
419
420 static size_t fuse_send_write(struct fuse_req *req, struct file *file,
421 struct inode *inode, loff_t pos, size_t count)
422 {
423 struct fuse_conn *fc = get_fuse_conn(inode);
424 struct fuse_file *ff = file->private_data;
425 struct fuse_write_in inarg;
426 struct fuse_write_out outarg;
427
428 memset(&inarg, 0, sizeof(struct fuse_write_in));
429 inarg.fh = ff->fh;
430 inarg.offset = pos;
431 inarg.size = count;
432 req->in.h.opcode = FUSE_WRITE;
433 req->in.h.nodeid = get_node_id(inode);
434 req->in.argpages = 1;
435 req->in.numargs = 2;
436 req->in.args[0].size = sizeof(struct fuse_write_in);
437 req->in.args[0].value = &inarg;
438 req->in.args[1].size = count;
439 req->out.numargs = 1;
440 req->out.args[0].size = sizeof(struct fuse_write_out);
441 req->out.args[0].value = &outarg;
442 request_send(fc, req);
443 return outarg.size;
444 }
445
446 static int fuse_prepare_write(struct file *file, struct page *page,
447 unsigned offset, unsigned to)
448 {
449 /* No op */
450 return 0;
451 }
452
453 static int fuse_commit_write(struct file *file, struct page *page,
454 unsigned offset, unsigned to)
455 {
456 int err;
457 size_t nres;
458 unsigned count = to - offset;
459 struct inode *inode = page->mapping->host;
460 struct fuse_conn *fc = get_fuse_conn(inode);
461 loff_t pos = page_offset(page) + offset;
462 struct fuse_req *req;
463
464 if (is_bad_inode(inode))
465 return -EIO;
466
467 req = fuse_get_req(fc);
468 if (IS_ERR(req))
469 return PTR_ERR(req);
470
471 req->num_pages = 1;
472 req->pages[0] = page;
473 req->page_offset = offset;
474 nres = fuse_send_write(req, file, inode, pos, count);
475 err = req->out.h.error;
476 fuse_put_request(fc, req);
477 if (!err && nres != count)
478 err = -EIO;
479 if (!err) {
480 pos += count;
481 spin_lock(&fc->lock);
482 if (pos > inode->i_size)
483 i_size_write(inode, pos);
484 spin_unlock(&fc->lock);
485
486 if (offset == 0 && to == PAGE_CACHE_SIZE) {
487 clear_page_dirty(page);
488 SetPageUptodate(page);
489 }
490 }
491 fuse_invalidate_attr(inode);
492 return err;
493 }
494
495 static void fuse_release_user_pages(struct fuse_req *req, int write)
496 {
497 unsigned i;
498
499 for (i = 0; i < req->num_pages; i++) {
500 struct page *page = req->pages[i];
501 if (write)
502 set_page_dirty_lock(page);
503 put_page(page);
504 }
505 }
506
507 static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
508 unsigned nbytes, int write)
509 {
510 unsigned long user_addr = (unsigned long) buf;
511 unsigned offset = user_addr & ~PAGE_MASK;
512 int npages;
513
514 /* This doesn't work with nfsd */
515 if (!current->mm)
516 return -EPERM;
517
518 nbytes = min(nbytes, (unsigned) FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT);
519 npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
520 npages = min(max(npages, 1), FUSE_MAX_PAGES_PER_REQ);
521 down_read(&current->mm->mmap_sem);
522 npages = get_user_pages(current, current->mm, user_addr, npages, write,
523 0, req->pages, NULL);
524 up_read(&current->mm->mmap_sem);
525 if (npages < 0)
526 return npages;
527
528 req->num_pages = npages;
529 req->page_offset = offset;
530 return 0;
531 }
532
533 static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
534 size_t count, loff_t *ppos, int write)
535 {
536 struct inode *inode = file->f_dentry->d_inode;
537 struct fuse_conn *fc = get_fuse_conn(inode);
538 size_t nmax = write ? fc->max_write : fc->max_read;
539 loff_t pos = *ppos;
540 ssize_t res = 0;
541 struct fuse_req *req;
542
543 if (is_bad_inode(inode))
544 return -EIO;
545
546 req = fuse_get_req(fc);
547 if (IS_ERR(req))
548 return PTR_ERR(req);
549
550 while (count) {
551 size_t nres;
552 size_t nbytes = min(count, nmax);
553 int err = fuse_get_user_pages(req, buf, nbytes, !write);
554 if (err) {
555 res = err;
556 break;
557 }
558 nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
559 nbytes = min(count, nbytes);
560 if (write)
561 nres = fuse_send_write(req, file, inode, pos, nbytes);
562 else
563 nres = fuse_send_read(req, file, inode, pos, nbytes);
564 fuse_release_user_pages(req, !write);
565 if (req->out.h.error) {
566 if (!res)
567 res = req->out.h.error;
568 break;
569 } else if (nres > nbytes) {
570 res = -EIO;
571 break;
572 }
573 count -= nres;
574 res += nres;
575 pos += nres;
576 buf += nres;
577 if (nres != nbytes)
578 break;
579 if (count) {
580 fuse_put_request(fc, req);
581 req = fuse_get_req(fc);
582 if (IS_ERR(req))
583 break;
584 }
585 }
586 fuse_put_request(fc, req);
587 if (res > 0) {
588 if (write) {
589 spin_lock(&fc->lock);
590 if (pos > inode->i_size)
591 i_size_write(inode, pos);
592 spin_unlock(&fc->lock);
593 }
594 *ppos = pos;
595 }
596 fuse_invalidate_attr(inode);
597
598 return res;
599 }
600
601 static ssize_t fuse_direct_read(struct file *file, char __user *buf,
602 size_t count, loff_t *ppos)
603 {
604 return fuse_direct_io(file, buf, count, ppos, 0);
605 }
606
607 static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
608 size_t count, loff_t *ppos)
609 {
610 struct inode *inode = file->f_dentry->d_inode;
611 ssize_t res;
612 /* Don't allow parallel writes to the same file */
613 mutex_lock(&inode->i_mutex);
614 res = fuse_direct_io(file, buf, count, ppos, 1);
615 mutex_unlock(&inode->i_mutex);
616 return res;
617 }
618
619 static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
620 {
621 if ((vma->vm_flags & VM_SHARED)) {
622 if ((vma->vm_flags & VM_WRITE))
623 return -ENODEV;
624 else
625 vma->vm_flags &= ~VM_MAYWRITE;
626 }
627 return generic_file_mmap(file, vma);
628 }
629
630 static int fuse_set_page_dirty(struct page *page)
631 {
632 printk("fuse_set_page_dirty: should not happen\n");
633 dump_stack();
634 return 0;
635 }
636
637 static int convert_fuse_file_lock(const struct fuse_file_lock *ffl,
638 struct file_lock *fl)
639 {
640 switch (ffl->type) {
641 case F_UNLCK:
642 break;
643
644 case F_RDLCK:
645 case F_WRLCK:
646 if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX ||
647 ffl->end < ffl->start)
648 return -EIO;
649
650 fl->fl_start = ffl->start;
651 fl->fl_end = ffl->end;
652 fl->fl_pid = ffl->pid;
653 break;
654
655 default:
656 return -EIO;
657 }
658 fl->fl_type = ffl->type;
659 return 0;
660 }
661
662 static void fuse_lk_fill(struct fuse_req *req, struct file *file,
663 const struct file_lock *fl, int opcode, pid_t pid)
664 {
665 struct inode *inode = file->f_dentry->d_inode;
666 struct fuse_conn *fc = get_fuse_conn(inode);
667 struct fuse_file *ff = file->private_data;
668 struct fuse_lk_in *arg = &req->misc.lk_in;
669
670 arg->fh = ff->fh;
671 arg->owner = fuse_lock_owner_id(fc, fl->fl_owner);
672 arg->lk.start = fl->fl_start;
673 arg->lk.end = fl->fl_end;
674 arg->lk.type = fl->fl_type;
675 arg->lk.pid = pid;
676 req->in.h.opcode = opcode;
677 req->in.h.nodeid = get_node_id(inode);
678 req->in.numargs = 1;
679 req->in.args[0].size = sizeof(*arg);
680 req->in.args[0].value = arg;
681 }
682
683 static int fuse_getlk(struct file *file, struct file_lock *fl)
684 {
685 struct inode *inode = file->f_dentry->d_inode;
686 struct fuse_conn *fc = get_fuse_conn(inode);
687 struct fuse_req *req;
688 struct fuse_lk_out outarg;
689 int err;
690
691 req = fuse_get_req(fc);
692 if (IS_ERR(req))
693 return PTR_ERR(req);
694
695 fuse_lk_fill(req, file, fl, FUSE_GETLK, 0);
696 req->out.numargs = 1;
697 req->out.args[0].size = sizeof(outarg);
698 req->out.args[0].value = &outarg;
699 request_send(fc, req);
700 err = req->out.h.error;
701 fuse_put_request(fc, req);
702 if (!err)
703 err = convert_fuse_file_lock(&outarg.lk, fl);
704
705 return err;
706 }
707
708 static int fuse_setlk(struct file *file, struct file_lock *fl)
709 {
710 struct inode *inode = file->f_dentry->d_inode;
711 struct fuse_conn *fc = get_fuse_conn(inode);
712 struct fuse_req *req;
713 int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK;
714 pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0;
715 int err;
716
717 /* Unlock on close is handled by the flush method */
718 if (fl->fl_flags & FL_CLOSE)
719 return 0;
720
721 req = fuse_get_req(fc);
722 if (IS_ERR(req))
723 return PTR_ERR(req);
724
725 fuse_lk_fill(req, file, fl, opcode, pid);
726 request_send(fc, req);
727 err = req->out.h.error;
728 /* locking is restartable */
729 if (err == -EINTR)
730 err = -ERESTARTSYS;
731 fuse_put_request(fc, req);
732 return err;
733 }
734
735 static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
736 {
737 struct inode *inode = file->f_dentry->d_inode;
738 struct fuse_conn *fc = get_fuse_conn(inode);
739 int err;
740
741 if (cmd == F_GETLK) {
742 if (fc->no_lock) {
743 if (!posix_test_lock(file, fl, fl))
744 fl->fl_type = F_UNLCK;
745 err = 0;
746 } else
747 err = fuse_getlk(file, fl);
748 } else {
749 if (fc->no_lock)
750 err = posix_lock_file_wait(file, fl);
751 else
752 err = fuse_setlk(file, fl);
753 }
754 return err;
755 }
756
757 static sector_t fuse_bmap(struct address_space *mapping, sector_t block)
758 {
759 struct inode *inode = mapping->host;
760 struct fuse_conn *fc = get_fuse_conn(inode);
761 struct fuse_req *req;
762 struct fuse_bmap_in inarg;
763 struct fuse_bmap_out outarg;
764 int err;
765
766 if (!inode->i_sb->s_bdev || fc->no_bmap)
767 return 0;
768
769 req = fuse_get_req(fc);
770 if (IS_ERR(req))
771 return 0;
772
773 memset(&inarg, 0, sizeof(inarg));
774 inarg.block = block;
775 inarg.blocksize = inode->i_sb->s_blocksize;
776 req->in.h.opcode = FUSE_BMAP;
777 req->in.h.nodeid = get_node_id(inode);
778 req->in.numargs = 1;
779 req->in.args[0].size = sizeof(inarg);
780 req->in.args[0].value = &inarg;
781 req->out.numargs = 1;
782 req->out.args[0].size = sizeof(outarg);
783 req->out.args[0].value = &outarg;
784 request_send(fc, req);
785 err = req->out.h.error;
786 fuse_put_request(fc, req);
787 if (err == -ENOSYS)
788 fc->no_bmap = 1;
789
790 return err ? 0 : outarg.block;
791 }
792
793 static const struct file_operations fuse_file_operations = {
794 .llseek = generic_file_llseek,
795 .read = do_sync_read,
796 .aio_read = generic_file_aio_read,
797 .write = do_sync_write,
798 .aio_write = generic_file_aio_write,
799 .mmap = fuse_file_mmap,
800 .open = fuse_open,
801 .flush = fuse_flush,
802 .release = fuse_release,
803 .fsync = fuse_fsync,
804 .lock = fuse_file_lock,
805 .sendfile = generic_file_sendfile,
806 };
807
808 static const struct file_operations fuse_direct_io_file_operations = {
809 .llseek = generic_file_llseek,
810 .read = fuse_direct_read,
811 .write = fuse_direct_write,
812 .open = fuse_open,
813 .flush = fuse_flush,
814 .release = fuse_release,
815 .fsync = fuse_fsync,
816 .lock = fuse_file_lock,
817 /* no mmap and sendfile */
818 };
819
820 static const struct address_space_operations fuse_file_aops = {
821 .readpage = fuse_readpage,
822 .prepare_write = fuse_prepare_write,
823 .commit_write = fuse_commit_write,
824 .readpages = fuse_readpages,
825 .set_page_dirty = fuse_set_page_dirty,
826 .bmap = fuse_bmap,
827 };
828
829 void fuse_init_file_inode(struct inode *inode)
830 {
831 inode->i_fop = &fuse_file_operations;
832 inode->i_data.a_ops = &fuse_file_aops;
833 }
Linux 2.6 libata-dev (mirror)