file.c 19.6 KB
Newer Older
1
2
/*
  FUSE: Filesystem in Userspace
3
  Copyright (C) 2001-2006  Miklos Szeredi <miklos@szeredi.hu>
4
5
6
7
8
9
10
11
12
13
14

  This program can be distributed under the terms of the GNU GPL.
  See the file COPYING.
*/

#include "fuse_i.h"

#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/kernel.h>

15
static const struct file_operations fuse_direct_io_file_operations;
16

17
18
static int fuse_send_open(struct inode *inode, struct file *file, int isdir,
			  struct fuse_open_out *outargp)
19
20
21
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_open_in inarg;
22
23
24
	struct fuse_req *req;
	int err;

25
26
27
	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

	memset(&inarg, 0, sizeof(inarg));
	inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
	req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
	req->in.h.nodeid = get_node_id(inode);
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
	req->out.numargs = 1;
	req->out.args[0].size = sizeof(*outargp);
	req->out.args[0].value = outargp;
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);

	return err;
}

struct fuse_file *fuse_file_alloc(void)
{
	struct fuse_file *ff;
	ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
	if (ff) {
51
52
		ff->reserved_req = fuse_request_alloc();
		if (!ff->reserved_req) {
53
54
55
56
57
58
59
60
61
			kfree(ff);
			ff = NULL;
		}
	}
	return ff;
}

void fuse_file_free(struct fuse_file *ff)
{
62
	fuse_request_free(ff->reserved_req);
63
64
65
66
67
68
69
70
71
	kfree(ff);
}

void fuse_finish_open(struct inode *inode, struct file *file,
		      struct fuse_file *ff, struct fuse_open_out *outarg)
{
	if (outarg->open_flags & FOPEN_DIRECT_IO)
		file->f_op = &fuse_direct_io_file_operations;
	if (!(outarg->open_flags & FOPEN_KEEP_CACHE))
72
		invalidate_mapping_pages(inode->i_mapping, 0, -1);
73
74
75
76
77
78
	ff->fh = outarg->fh;
	file->private_data = ff;
}

int fuse_open_common(struct inode *inode, struct file *file, int isdir)
{
79
80
81
82
	struct fuse_open_out outarg;
	struct fuse_file *ff;
	int err;

Miklos Szeredi's avatar
Miklos Szeredi committed
83
84
85
86
	/* VFS checks this, but only _after_ ->open() */
	if (file->f_flags & O_DIRECT)
		return -EINVAL;

87
88
89
90
91
92
93
	err = generic_file_open(inode, file);
	if (err)
		return err;

	/* If opening the root node, no lookup has been performed on
	   it, so the attributes must be refreshed */
	if (get_node_id(inode) == FUSE_ROOT_ID) {
94
		err = fuse_do_getattr(inode);
95
96
97
98
		if (err)
		 	return err;
	}

99
	ff = fuse_file_alloc();
100
	if (!ff)
101
		return -ENOMEM;
102

103
104
105
106
107
108
109
	err = fuse_send_open(inode, file, isdir, &outarg);
	if (err)
		fuse_file_free(ff);
	else {
		if (isdir)
			outarg.open_flags &= ~FOPEN_DIRECT_IO;
		fuse_finish_open(inode, file, ff, &outarg);
110
111
112
113
114
	}

	return err;
}

115
116
struct fuse_req *fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags,
				   int opcode)
117
{
118
	struct fuse_req *req = ff->reserved_req;
119
120
121
	struct fuse_release_in *inarg = &req->misc.release_in;

	inarg->fh = ff->fh;
122
	inarg->flags = flags;
123
	req->in.h.opcode = opcode;
124
	req->in.h.nodeid = nodeid;
125
126
127
128
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(struct fuse_release_in);
	req->in.args[0].value = inarg;
	kfree(ff);
129
130

	return req;
131
132
133
134
135
136
137
}

int fuse_release_common(struct inode *inode, struct file *file, int isdir)
{
	struct fuse_file *ff = file->private_data;
	if (ff) {
		struct fuse_conn *fc = get_fuse_conn(inode);
138
139
140
141
142
143
		struct fuse_req *req;

		req = fuse_release_fill(ff, get_node_id(inode), file->f_flags,
					isdir ? FUSE_RELEASEDIR : FUSE_RELEASE);

		/* Hold vfsmount and dentry until release is finished */
144
145
		req->vfsmount = mntget(file->f_path.mnt);
		req->dentry = dget(file->f_path.dentry);
146
		request_send_background(fc, req);
147
	}
148
149
150
151
152

	/* Return value is ignored by VFS */
	return 0;
}

153
154
155
156
157
158
159
160
161
162
static int fuse_open(struct inode *inode, struct file *file)
{
	return fuse_open_common(inode, file, 0);
}

static int fuse_release(struct inode *inode, struct file *file)
{
	return fuse_release_common(inode, file, 0);
}

163
/*
164
165
 * Scramble the ID space with XTEA, so that the value of the files_struct
 * pointer is not exposed to userspace.
166
 */
167
static u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
168
{
169
170
171
172
173
174
175
176
177
178
179
180
181
182
	u32 *k = fc->scramble_key;
	u64 v = (unsigned long) id;
	u32 v0 = v;
	u32 v1 = v >> 32;
	u32 sum = 0;
	int i;

	for (i = 0; i < 32; i++) {
		v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]);
		sum += 0x9E3779B9;
		v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]);
	}

	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_path.dentry->d_inode;
188
189
190
191
192
193
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_file *ff = file->private_data;
	struct fuse_req *req;
	struct fuse_flush_in inarg;
	int err;

194
195
196
	if (is_bad_inode(inode))
		return -EIO;

197
198
199
	if (fc->no_flush)
		return 0;

200
	req = fuse_get_req_nofail(fc, file);
201
202
	memset(&inarg, 0, sizeof(inarg));
	inarg.fh = ff->fh;
203
	inarg.lock_owner = fuse_lock_owner_id(fc, id);
204
205
206
207
208
	req->in.h.opcode = FUSE_FLUSH;
	req->in.h.nodeid = get_node_id(inode);
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
209
	req->force = 1;
210
	request_send(fc, req);
211
212
213
214
215
216
217
218
219
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (err == -ENOSYS) {
		fc->no_flush = 1;
		err = 0;
	}
	return err;
}

220
221
int fuse_fsync_common(struct file *file, struct dentry *de, int datasync,
		      int isdir)
222
223
224
225
226
227
228
229
{
	struct inode *inode = de->d_inode;
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_file *ff = file->private_data;
	struct fuse_req *req;
	struct fuse_fsync_in inarg;
	int err;

230
231
232
	if (is_bad_inode(inode))
		return -EIO;

233
	if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
234
235
		return 0;

236
237
238
	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
239
240
241
242

	memset(&inarg, 0, sizeof(inarg));
	inarg.fh = ff->fh;
	inarg.fsync_flags = datasync ? 1 : 0;
243
	req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC;
244
245
246
247
248
249
250
251
	req->in.h.nodeid = get_node_id(inode);
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (err == -ENOSYS) {
252
253
254
255
		if (isdir)
			fc->no_fsyncdir = 1;
		else
			fc->no_fsync = 1;
256
257
258
259
260
		err = 0;
	}
	return err;
}

261
262
263
264
265
static int fuse_fsync(struct file *file, struct dentry *de, int datasync)
{
	return fuse_fsync_common(file, de, datasync, 0);
}

266
267
void fuse_read_fill(struct fuse_req *req, struct file *file,
		    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
273
274
275
	inarg->fh = ff->fh;
	inarg->offset = pos;
	inarg->size = count;
	req->in.h.opcode = opcode;
276
277
278
	req->in.h.nodeid = get_node_id(inode);
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(struct fuse_read_in);
279
	req->in.args[0].value = inarg;
280
281
282
283
284
285
	req->out.argpages = 1;
	req->out.argvar = 1;
	req->out.numargs = 1;
	req->out.args[0].size = count;
}

286
287
static size_t fuse_send_read(struct fuse_req *req, struct file *file,
			     struct inode *inode, loff_t pos, size_t count)
288
{
289
290
291
292
	struct fuse_conn *fc = get_fuse_conn(inode);
	fuse_read_fill(req, file, inode, pos, count, FUSE_READ);
	request_send(fc, req);
	return req->out.args[0].size;
293
294
}

295
296
297
298
static int fuse_readpage(struct file *file, struct page *page)
{
	struct inode *inode = page->mapping->host;
	struct fuse_conn *fc = get_fuse_conn(inode);
299
300
301
302
303
304
305
	struct fuse_req *req;
	int err;

	err = -EIO;
	if (is_bad_inode(inode))
		goto out;

306
307
308
	req = fuse_get_req(fc);
	err = PTR_ERR(req);
	if (IS_ERR(req))
309
310
311
312
313
		goto out;

	req->out.page_zeroing = 1;
	req->num_pages = 1;
	req->pages[0] = page;
314
	fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE);
315
316
317
318
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err)
		SetPageUptodate(page);
319
	fuse_invalidate_attr(inode); /* atime changed */
320
321
322
323
324
 out:
	unlock_page(page);
	return err;
}

325
static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
326
{
327
328
329
330
	int i;

	fuse_invalidate_attr(req->pages[0]->mapping->host); /* atime changed */

331
332
333
334
	for (i = 0; i < req->num_pages; i++) {
		struct page *page = req->pages[i];
		if (!req->out.h.error)
			SetPageUptodate(page);
335
336
		else
			SetPageError(page);
337
338
		unlock_page(page);
	}
339
340
341
342
343
344
345
346
347
348
349
	fuse_put_request(fc, req);
}

static void fuse_send_readpages(struct fuse_req *req, struct file *file,
				struct inode *inode)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	loff_t pos = page_offset(req->pages[0]);
	size_t count = req->num_pages << PAGE_CACHE_SHIFT;
	req->out.page_zeroing = 1;
	fuse_read_fill(req, file, inode, pos, count, FUSE_READ);
350
	if (fc->async_read) {
351
352
		get_file(file);
		req->file = file;
353
354
355
356
357
358
		req->end = fuse_readpages_end;
		request_send_background(fc, req);
	} else {
		request_send(fc, req);
		fuse_readpages_end(fc, req);
	}
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
}

struct fuse_readpages_data {
	struct fuse_req *req;
	struct file *file;
	struct inode *inode;
};

static int fuse_readpages_fill(void *_data, struct page *page)
{
	struct fuse_readpages_data *data = _data;
	struct fuse_req *req = data->req;
	struct inode *inode = data->inode;
	struct fuse_conn *fc = get_fuse_conn(inode);

	if (req->num_pages &&
	    (req->num_pages == FUSE_MAX_PAGES_PER_REQ ||
	     (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read ||
	     req->pages[req->num_pages - 1]->index + 1 != page->index)) {
378
		fuse_send_readpages(req, data->file, inode);
379
380
		data->req = req = fuse_get_req(fc);
		if (IS_ERR(req)) {
381
			unlock_page(page);
382
			return PTR_ERR(req);
383
384
385
386
387
388
389
390
391
392
393
394
395
396
		}
	}
	req->pages[req->num_pages] = page;
	req->num_pages ++;
	return 0;
}

static int fuse_readpages(struct file *file, struct address_space *mapping,
			  struct list_head *pages, unsigned nr_pages)
{
	struct inode *inode = mapping->host;
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_readpages_data data;
	int err;
397

398
	err = -EIO;
399
	if (is_bad_inode(inode))
400
		goto out;
401

402
403
	data.file = file;
	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
411
412
413
414
415
	if (!err) {
		if (data.req->num_pages)
			fuse_send_readpages(data.req, file, inode);
		else
			fuse_put_request(fc, data.req);
	}
416
out:
417
	return err;
418
419
}

420
421
static size_t fuse_send_write(struct fuse_req *req, struct file *file,
			      struct inode *inode, loff_t pos, size_t count)
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_file *ff = file->private_data;
	struct fuse_write_in inarg;
	struct fuse_write_out outarg;

	memset(&inarg, 0, sizeof(struct fuse_write_in));
	inarg.fh = ff->fh;
	inarg.offset = pos;
	inarg.size = count;
	req->in.h.opcode = FUSE_WRITE;
	req->in.h.nodeid = get_node_id(inode);
	req->in.argpages = 1;
	req->in.numargs = 2;
	req->in.args[0].size = sizeof(struct fuse_write_in);
	req->in.args[0].value = &inarg;
	req->in.args[1].size = count;
	req->out.numargs = 1;
	req->out.args[0].size = sizeof(struct fuse_write_out);
	req->out.args[0].value = &outarg;
442
	request_send(fc, req);
443
444
445
446
447
448
449
450
451
452
453
454
455
456
	return outarg.size;
}

static int fuse_prepare_write(struct file *file, struct page *page,
			      unsigned offset, unsigned to)
{
	/* No op */
	return 0;
}

static int fuse_commit_write(struct file *file, struct page *page,
			     unsigned offset, unsigned to)
{
	int err;
457
	size_t nres;
458
459
460
	unsigned count = to - offset;
	struct inode *inode = page->mapping->host;
	struct fuse_conn *fc = get_fuse_conn(inode);
461
	loff_t pos = page_offset(page) + offset;
462
463
464
465
466
	struct fuse_req *req;

	if (is_bad_inode(inode))
		return -EIO;

467
468
469
	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
470
471
472
473
474
475
476
477
478
479
480

	req->num_pages = 1;
	req->pages[0] = page;
	req->page_offset = offset;
	nres = fuse_send_write(req, file, inode, pos, count);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err && nres != count)
		err = -EIO;
	if (!err) {
		pos += count;
Miklos Szeredi's avatar
Miklos Szeredi committed
481
482
		spin_lock(&fc->lock);
		if (pos > inode->i_size)
483
			i_size_write(inode, pos);
Miklos Szeredi's avatar
Miklos Szeredi committed
484
		spin_unlock(&fc->lock);
485

486
		if (offset == 0 && to == PAGE_CACHE_SIZE)
487
			SetPageUptodate(page);
488
489
	}
	fuse_invalidate_attr(inode);
490
491
492
	return err;
}

Miklos Szeredi's avatar
Miklos Szeredi committed
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
static void fuse_release_user_pages(struct fuse_req *req, int write)
{
	unsigned i;

	for (i = 0; i < req->num_pages; i++) {
		struct page *page = req->pages[i];
		if (write)
			set_page_dirty_lock(page);
		put_page(page);
	}
}

static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
			       unsigned nbytes, int write)
{
	unsigned long user_addr = (unsigned long) buf;
	unsigned offset = user_addr & ~PAGE_MASK;
	int npages;

	/* This doesn't work with nfsd */
	if (!current->mm)
		return -EPERM;

	nbytes = min(nbytes, (unsigned) FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT);
	npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
518
	npages = min(max(npages, 1), FUSE_MAX_PAGES_PER_REQ);
Miklos Szeredi's avatar
Miklos Szeredi committed
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
	down_read(&current->mm->mmap_sem);
	npages = get_user_pages(current, current->mm, user_addr, npages, write,
				0, req->pages, NULL);
	up_read(&current->mm->mmap_sem);
	if (npages < 0)
		return npages;

	req->num_pages = npages;
	req->page_offset = offset;
	return 0;
}

static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
			      size_t count, loff_t *ppos, int write)
{
534
	struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi's avatar
Miklos Szeredi committed
535
536
537
538
	struct fuse_conn *fc = get_fuse_conn(inode);
	size_t nmax = write ? fc->max_write : fc->max_read;
	loff_t pos = *ppos;
	ssize_t res = 0;
539
540
541
542
543
	struct fuse_req *req;

	if (is_bad_inode(inode))
		return -EIO;

544
545
546
	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
Miklos Szeredi's avatar
Miklos Szeredi committed
547
548
549
550
551
552
553
554
555

	while (count) {
		size_t nres;
		size_t nbytes = min(count, nmax);
		int err = fuse_get_user_pages(req, buf, nbytes, !write);
		if (err) {
			res = err;
			break;
		}
556
557
		nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
		nbytes = min(count, nbytes);
Miklos Szeredi's avatar
Miklos Szeredi committed
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
		if (write)
			nres = fuse_send_write(req, file, inode, pos, nbytes);
		else
			nres = fuse_send_read(req, file, inode, pos, nbytes);
		fuse_release_user_pages(req, !write);
		if (req->out.h.error) {
			if (!res)
				res = req->out.h.error;
			break;
		} else if (nres > nbytes) {
			res = -EIO;
			break;
		}
		count -= nres;
		res += nres;
		pos += nres;
		buf += nres;
		if (nres != nbytes)
			break;
577
578
579
580
581
582
		if (count) {
			fuse_put_request(fc, req);
			req = fuse_get_req(fc);
			if (IS_ERR(req))
				break;
		}
Miklos Szeredi's avatar
Miklos Szeredi committed
583
584
585
	}
	fuse_put_request(fc, req);
	if (res > 0) {
Miklos Szeredi's avatar
Miklos Szeredi committed
586
587
588
589
590
591
		if (write) {
			spin_lock(&fc->lock);
			if (pos > inode->i_size)
				i_size_write(inode, pos);
			spin_unlock(&fc->lock);
		}
Miklos Szeredi's avatar
Miklos Szeredi committed
592
		*ppos = pos;
593
594
	}
	fuse_invalidate_attr(inode);
Miklos Szeredi's avatar
Miklos Szeredi committed
595
596
597
598
599
600
601
602
603
604
605
606
607

	return res;
}

static ssize_t fuse_direct_read(struct file *file, char __user *buf,
				     size_t count, loff_t *ppos)
{
	return fuse_direct_io(file, buf, count, ppos, 0);
}

static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
				 size_t count, loff_t *ppos)
{
608
	struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi's avatar
Miklos Szeredi committed
609
610
	ssize_t res;
	/* Don't allow parallel writes to the same file */
611
	mutex_lock(&inode->i_mutex);
Miklos Szeredi's avatar
Miklos Szeredi committed
612
	res = fuse_direct_io(file, buf, count, ppos, 1);
613
	mutex_unlock(&inode->i_mutex);
Miklos Szeredi's avatar
Miklos Szeredi committed
614
615
616
	return res;
}

617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	if ((vma->vm_flags & VM_SHARED)) {
		if ((vma->vm_flags & VM_WRITE))
			return -ENODEV;
		else
			vma->vm_flags &= ~VM_MAYWRITE;
	}
	return generic_file_mmap(file, vma);
}

static int fuse_set_page_dirty(struct page *page)
{
	printk("fuse_set_page_dirty: should not happen\n");
	dump_stack();
	return 0;
}

635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
static int convert_fuse_file_lock(const struct fuse_file_lock *ffl,
				  struct file_lock *fl)
{
	switch (ffl->type) {
	case F_UNLCK:
		break;

	case F_RDLCK:
	case F_WRLCK:
		if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX ||
		    ffl->end < ffl->start)
			return -EIO;

		fl->fl_start = ffl->start;
		fl->fl_end = ffl->end;
		fl->fl_pid = ffl->pid;
		break;

	default:
		return -EIO;
	}
	fl->fl_type = ffl->type;
	return 0;
}

static void fuse_lk_fill(struct fuse_req *req, struct file *file,
			 const struct file_lock *fl, int opcode, pid_t pid)
{
663
	struct inode *inode = file->f_path.dentry->d_inode;
664
	struct fuse_conn *fc = get_fuse_conn(inode);
665
666
667
668
	struct fuse_file *ff = file->private_data;
	struct fuse_lk_in *arg = &req->misc.lk_in;

	arg->fh = ff->fh;
669
	arg->owner = fuse_lock_owner_id(fc, fl->fl_owner);
670
671
672
673
674
675
676
677
678
679
680
681
682
	arg->lk.start = fl->fl_start;
	arg->lk.end = fl->fl_end;
	arg->lk.type = fl->fl_type;
	arg->lk.pid = pid;
	req->in.h.opcode = opcode;
	req->in.h.nodeid = get_node_id(inode);
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(*arg);
	req->in.args[0].value = arg;
}

static int fuse_getlk(struct file *file, struct file_lock *fl)
{
683
	struct inode *inode = file->f_path.dentry->d_inode;
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_req *req;
	struct fuse_lk_out outarg;
	int err;

	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);

	fuse_lk_fill(req, file, fl, FUSE_GETLK, 0);
	req->out.numargs = 1;
	req->out.args[0].size = sizeof(outarg);
	req->out.args[0].value = &outarg;
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (!err)
		err = convert_fuse_file_lock(&outarg.lk, fl);

	return err;
}

static int fuse_setlk(struct file *file, struct file_lock *fl)
{
708
	struct inode *inode = file->f_path.dentry->d_inode;
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_req *req;
	int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK;
	pid_t pid = fl->fl_type != F_UNLCK ? current->tgid : 0;
	int err;

	/* Unlock on close is handled by the flush method */
	if (fl->fl_flags & FL_CLOSE)
		return 0;

	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);

	fuse_lk_fill(req, file, fl, opcode, pid);
	request_send(fc, req);
	err = req->out.h.error;
726
727
728
	/* locking is restartable */
	if (err == -EINTR)
		err = -ERESTARTSYS;
729
730
731
732
733
734
	fuse_put_request(fc, req);
	return err;
}

static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
{
735
	struct inode *inode = file->f_path.dentry->d_inode;
736
737
738
739
740
	struct fuse_conn *fc = get_fuse_conn(inode);
	int err;

	if (cmd == F_GETLK) {
		if (fc->no_lock) {
741
			posix_test_lock(file, fl);
742
743
744
745
746
747
748
749
750
751
752
753
			err = 0;
		} else
			err = fuse_getlk(file, fl);
	} else {
		if (fc->no_lock)
			err = posix_lock_file_wait(file, fl);
		else
			err = fuse_setlk(file, fl);
	}
	return err;
}

754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
static sector_t fuse_bmap(struct address_space *mapping, sector_t block)
{
	struct inode *inode = mapping->host;
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_req *req;
	struct fuse_bmap_in inarg;
	struct fuse_bmap_out outarg;
	int err;

	if (!inode->i_sb->s_bdev || fc->no_bmap)
		return 0;

	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return 0;

	memset(&inarg, 0, sizeof(inarg));
	inarg.block = block;
	inarg.blocksize = inode->i_sb->s_blocksize;
	req->in.h.opcode = FUSE_BMAP;
	req->in.h.nodeid = get_node_id(inode);
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(inarg);
	req->in.args[0].value = &inarg;
	req->out.numargs = 1;
	req->out.args[0].size = sizeof(outarg);
	req->out.args[0].value = &outarg;
	request_send(fc, req);
	err = req->out.h.error;
	fuse_put_request(fc, req);
	if (err == -ENOSYS)
		fc->no_bmap = 1;

	return err ? 0 : outarg.block;
}

790
static const struct file_operations fuse_file_operations = {
791
	.llseek		= generic_file_llseek,
792
793
794
795
	.read		= do_sync_read,
	.aio_read	= generic_file_aio_read,
	.write		= do_sync_write,
	.aio_write	= generic_file_aio_write,
796
797
798
799
800
	.mmap		= fuse_file_mmap,
	.open		= fuse_open,
	.flush		= fuse_flush,
	.release	= fuse_release,
	.fsync		= fuse_fsync,
801
	.lock		= fuse_file_lock,
802
803
804
	.sendfile	= generic_file_sendfile,
};

805
static const struct file_operations fuse_direct_io_file_operations = {
Miklos Szeredi's avatar
Miklos Szeredi committed
806
807
808
809
810
811
812
	.llseek		= generic_file_llseek,
	.read		= fuse_direct_read,
	.write		= fuse_direct_write,
	.open		= fuse_open,
	.flush		= fuse_flush,
	.release	= fuse_release,
	.fsync		= fuse_fsync,
813
	.lock		= fuse_file_lock,
Miklos Szeredi's avatar
Miklos Szeredi committed
814
815
816
	/* no mmap and sendfile */
};

817
static const struct address_space_operations fuse_file_aops  = {
818
819
820
	.readpage	= fuse_readpage,
	.prepare_write	= fuse_prepare_write,
	.commit_write	= fuse_commit_write,
821
	.readpages	= fuse_readpages,
822
	.set_page_dirty	= fuse_set_page_dirty,
823
	.bmap		= fuse_bmap,
824
825
826
827
};

void fuse_init_file_inode(struct inode *inode)
{
828
829
	inode->i_fop = &fuse_file_operations;
	inode->i_data.a_ops = &fuse_file_aops;
830
}