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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#include <linux/sched/signal.h>
16#include <linux/module.h>
17#include <linux/swap.h>
18#include <linux/falloc.h>
19#include <linux/uio.h>
20#include <linux/fs.h>
21
22static int fuse_send_open(struct fuse_mount *fm, u64 nodeid,
23 unsigned int open_flags, int opcode,
24 struct fuse_open_out *outargp)
25{
26 struct fuse_open_in inarg;
27 FUSE_ARGS(args);
28
29 memset(&inarg, 0, sizeof(inarg));
30 inarg.flags = open_flags & ~(O_CREAT | O_EXCL | O_NOCTTY);
31 if (!fm->fc->atomic_o_trunc)
32 inarg.flags &= ~O_TRUNC;
33
34 if (fm->fc->handle_killpriv_v2 &&
35 (inarg.flags & O_TRUNC) && !capable(CAP_FSETID)) {
36 inarg.open_flags |= FUSE_OPEN_KILL_SUIDGID;
37 }
38
39 args.opcode = opcode;
40 args.nodeid = nodeid;
41 args.in_numargs = 1;
42 args.in_args[0].size = sizeof(inarg);
43 args.in_args[0].value = &inarg;
44 args.out_numargs = 1;
45 args.out_args[0].size = sizeof(*outargp);
46 args.out_args[0].value = outargp;
47
48 return fuse_simple_request(fm, &args);
49}
50
51struct fuse_release_args {
52 struct fuse_args args;
53 struct fuse_release_in inarg;
54 struct inode *inode;
55};
56
57struct fuse_file *fuse_file_alloc(struct fuse_mount *fm)
58{
59 struct fuse_file *ff;
60
61 ff = kzalloc(sizeof(struct fuse_file), GFP_KERNEL_ACCOUNT);
62 if (unlikely(!ff))
63 return NULL;
64
65 ff->fm = fm;
66 ff->release_args = kzalloc(sizeof(*ff->release_args),
67 GFP_KERNEL_ACCOUNT);
68 if (!ff->release_args) {
69 kfree(ff);
70 return NULL;
71 }
72
73 INIT_LIST_HEAD(&ff->write_entry);
74 mutex_init(&ff->readdir.lock);
75 refcount_set(&ff->count, 1);
76 RB_CLEAR_NODE(&ff->polled_node);
77 init_waitqueue_head(&ff->poll_wait);
78
79 ff->kh = atomic64_inc_return(&fm->fc->khctr);
80
81 return ff;
82}
83
84void fuse_file_free(struct fuse_file *ff)
85{
86 kfree(ff->release_args);
87 mutex_destroy(&ff->readdir.lock);
88 kfree(ff);
89}
90
91static struct fuse_file *fuse_file_get(struct fuse_file *ff)
92{
93 refcount_inc(&ff->count);
94 return ff;
95}
96
97static void fuse_release_end(struct fuse_mount *fm, struct fuse_args *args,
98 int error)
99{
100 struct fuse_release_args *ra = container_of(args, typeof(*ra), args);
101
102 iput(ra->inode);
103 kfree(ra);
104}
105
106static void fuse_file_put(struct fuse_file *ff, bool sync, bool isdir)
107{
108 if (refcount_dec_and_test(&ff->count)) {
109 struct fuse_args *args = &ff->release_args->args;
110
111 if (isdir ? ff->fm->fc->no_opendir : ff->fm->fc->no_open) {
112
113 fuse_release_end(ff->fm, args, 0);
114 } else if (sync) {
115 fuse_simple_request(ff->fm, args);
116 fuse_release_end(ff->fm, args, 0);
117 } else {
118 args->end = fuse_release_end;
119 if (fuse_simple_background(ff->fm, args,
120 GFP_KERNEL | __GFP_NOFAIL))
121 fuse_release_end(ff->fm, args, -ENOTCONN);
122 }
123 kfree(ff);
124 }
125}
126
127struct fuse_file *fuse_file_open(struct fuse_mount *fm, u64 nodeid,
128 unsigned int open_flags, bool isdir)
129{
130 struct fuse_conn *fc = fm->fc;
131 struct fuse_file *ff;
132 int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
133
134 ff = fuse_file_alloc(fm);
135 if (!ff)
136 return ERR_PTR(-ENOMEM);
137
138 ff->fh = 0;
139
140 ff->open_flags = FOPEN_KEEP_CACHE | (isdir ? FOPEN_CACHE_DIR : 0);
141 if (isdir ? !fc->no_opendir : !fc->no_open) {
142 struct fuse_open_out outarg;
143 int err;
144
145 err = fuse_send_open(fm, nodeid, open_flags, opcode, &outarg);
146 if (!err) {
147 ff->fh = outarg.fh;
148 ff->open_flags = outarg.open_flags;
149
150 } else if (err != -ENOSYS) {
151 fuse_file_free(ff);
152 return ERR_PTR(err);
153 } else {
154 if (isdir)
155 fc->no_opendir = 1;
156 else
157 fc->no_open = 1;
158 }
159 }
160
161 if (isdir)
162 ff->open_flags &= ~FOPEN_DIRECT_IO;
163
164 ff->nodeid = nodeid;
165
166 return ff;
167}
168
169int fuse_do_open(struct fuse_mount *fm, u64 nodeid, struct file *file,
170 bool isdir)
171{
172 struct fuse_file *ff = fuse_file_open(fm, nodeid, file->f_flags, isdir);
173
174 if (!IS_ERR(ff))
175 file->private_data = ff;
176
177 return PTR_ERR_OR_ZERO(ff);
178}
179EXPORT_SYMBOL_GPL(fuse_do_open);
180
181static void fuse_link_write_file(struct file *file)
182{
183 struct inode *inode = file_inode(file);
184 struct fuse_inode *fi = get_fuse_inode(inode);
185 struct fuse_file *ff = file->private_data;
186
187
188
189
190 spin_lock(&fi->lock);
191 if (list_empty(&ff->write_entry))
192 list_add(&ff->write_entry, &fi->write_files);
193 spin_unlock(&fi->lock);
194}
195
196void fuse_finish_open(struct inode *inode, struct file *file)
197{
198 struct fuse_file *ff = file->private_data;
199 struct fuse_conn *fc = get_fuse_conn(inode);
200
201 if (ff->open_flags & FOPEN_STREAM)
202 stream_open(inode, file);
203 else if (ff->open_flags & FOPEN_NONSEEKABLE)
204 nonseekable_open(inode, file);
205
206 if (fc->atomic_o_trunc && (file->f_flags & O_TRUNC)) {
207 struct fuse_inode *fi = get_fuse_inode(inode);
208
209 spin_lock(&fi->lock);
210 fi->attr_version = atomic64_inc_return(&fc->attr_version);
211 i_size_write(inode, 0);
212 spin_unlock(&fi->lock);
213 truncate_pagecache(inode, 0);
214 file_update_time(file);
215 fuse_invalidate_attr_mask(inode, FUSE_STATX_MODSIZE);
216 } else if (!(ff->open_flags & FOPEN_KEEP_CACHE)) {
217 invalidate_inode_pages2(inode->i_mapping);
218 }
219
220 if ((file->f_mode & FMODE_WRITE) && fc->writeback_cache)
221 fuse_link_write_file(file);
222}
223
224int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
225{
226 struct fuse_mount *fm = get_fuse_mount(inode);
227 struct fuse_conn *fc = fm->fc;
228 int err;
229 bool is_wb_truncate = (file->f_flags & O_TRUNC) &&
230 fc->atomic_o_trunc &&
231 fc->writeback_cache;
232 bool dax_truncate = (file->f_flags & O_TRUNC) &&
233 fc->atomic_o_trunc && FUSE_IS_DAX(inode);
234
235 if (fuse_is_bad(inode))
236 return -EIO;
237
238 err = generic_file_open(inode, file);
239 if (err)
240 return err;
241
242 if (is_wb_truncate || dax_truncate) {
243 inode_lock(inode);
244 fuse_set_nowrite(inode);
245 }
246
247 if (dax_truncate) {
248 filemap_invalidate_lock(inode->i_mapping);
249 err = fuse_dax_break_layouts(inode, 0, 0);
250 if (err)
251 goto out;
252 }
253
254 err = fuse_do_open(fm, get_node_id(inode), file, isdir);
255 if (!err)
256 fuse_finish_open(inode, file);
257
258out:
259 if (dax_truncate)
260 filemap_invalidate_unlock(inode->i_mapping);
261
262 if (is_wb_truncate | dax_truncate) {
263 fuse_release_nowrite(inode);
264 inode_unlock(inode);
265 }
266
267 return err;
268}
269
270static void fuse_prepare_release(struct fuse_inode *fi, struct fuse_file *ff,
271 unsigned int flags, int opcode)
272{
273 struct fuse_conn *fc = ff->fm->fc;
274 struct fuse_release_args *ra = ff->release_args;
275
276
277 if (likely(fi)) {
278 spin_lock(&fi->lock);
279 list_del(&ff->write_entry);
280 spin_unlock(&fi->lock);
281 }
282 spin_lock(&fc->lock);
283 if (!RB_EMPTY_NODE(&ff->polled_node))
284 rb_erase(&ff->polled_node, &fc->polled_files);
285 spin_unlock(&fc->lock);
286
287 wake_up_interruptible_all(&ff->poll_wait);
288
289 ra->inarg.fh = ff->fh;
290 ra->inarg.flags = flags;
291 ra->args.in_numargs = 1;
292 ra->args.in_args[0].size = sizeof(struct fuse_release_in);
293 ra->args.in_args[0].value = &ra->inarg;
294 ra->args.opcode = opcode;
295 ra->args.nodeid = ff->nodeid;
296 ra->args.force = true;
297 ra->args.nocreds = true;
298}
299
300void fuse_file_release(struct inode *inode, struct fuse_file *ff,
301 unsigned int open_flags, fl_owner_t id, bool isdir)
302{
303 struct fuse_inode *fi = get_fuse_inode(inode);
304 struct fuse_release_args *ra = ff->release_args;
305 int opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE;
306
307 fuse_prepare_release(fi, ff, open_flags, opcode);
308
309 if (ff->flock) {
310 ra->inarg.release_flags |= FUSE_RELEASE_FLOCK_UNLOCK;
311 ra->inarg.lock_owner = fuse_lock_owner_id(ff->fm->fc, id);
312 }
313
314 ra->inode = igrab(inode);
315
316
317
318
319
320
321
322
323
324
325 fuse_file_put(ff, ff->fm->fc->destroy, isdir);
326}
327
328void fuse_release_common(struct file *file, bool isdir)
329{
330 fuse_file_release(file_inode(file), file->private_data, file->f_flags,
331 (fl_owner_t) file, isdir);
332}
333
334static int fuse_open(struct inode *inode, struct file *file)
335{
336 return fuse_open_common(inode, file, false);
337}
338
339static int fuse_release(struct inode *inode, struct file *file)
340{
341 fuse_release_common(file, false);
342
343
344 return 0;
345}
346
347void fuse_sync_release(struct fuse_inode *fi, struct fuse_file *ff,
348 unsigned int flags)
349{
350 WARN_ON(refcount_read(&ff->count) > 1);
351 fuse_prepare_release(fi, ff, flags, FUSE_RELEASE);
352
353
354
355
356 fuse_file_put(ff, true, false);
357}
358EXPORT_SYMBOL_GPL(fuse_sync_release);
359
360
361
362
363
364u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
365{
366 u32 *k = fc->scramble_key;
367 u64 v = (unsigned long) id;
368 u32 v0 = v;
369 u32 v1 = v >> 32;
370 u32 sum = 0;
371 int i;
372
373 for (i = 0; i < 32; i++) {
374 v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ (sum + k[sum & 3]);
375 sum += 0x9E3779B9;
376 v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ (sum + k[sum>>11 & 3]);
377 }
378
379 return (u64) v0 + ((u64) v1 << 32);
380}
381
382struct fuse_writepage_args {
383 struct fuse_io_args ia;
384 struct rb_node writepages_entry;
385 struct list_head queue_entry;
386 struct fuse_writepage_args *next;
387 struct inode *inode;
388 struct fuse_sync_bucket *bucket;
389};
390
391static struct fuse_writepage_args *fuse_find_writeback(struct fuse_inode *fi,
392 pgoff_t idx_from, pgoff_t idx_to)
393{
394 struct rb_node *n;
395
396 n = fi->writepages.rb_node;
397
398 while (n) {
399 struct fuse_writepage_args *wpa;
400 pgoff_t curr_index;
401
402 wpa = rb_entry(n, struct fuse_writepage_args, writepages_entry);
403 WARN_ON(get_fuse_inode(wpa->inode) != fi);
404 curr_index = wpa->ia.write.in.offset >> PAGE_SHIFT;
405 if (idx_from >= curr_index + wpa->ia.ap.num_pages)
406 n = n->rb_right;
407 else if (idx_to < curr_index)
408 n = n->rb_left;
409 else
410 return wpa;
411 }
412 return NULL;
413}
414
415
416
417
418
419
420
421static bool fuse_range_is_writeback(struct inode *inode, pgoff_t idx_from,
422 pgoff_t idx_to)
423{
424 struct fuse_inode *fi = get_fuse_inode(inode);
425 bool found;
426
427 spin_lock(&fi->lock);
428 found = fuse_find_writeback(fi, idx_from, idx_to);
429 spin_unlock(&fi->lock);
430
431 return found;
432}
433
434static inline bool fuse_page_is_writeback(struct inode *inode, pgoff_t index)
435{
436 return fuse_range_is_writeback(inode, index, index);
437}
438
439
440
441
442
443
444
445static void fuse_wait_on_page_writeback(struct inode *inode, pgoff_t index)
446{
447 struct fuse_inode *fi = get_fuse_inode(inode);
448
449 wait_event(fi->page_waitq, !fuse_page_is_writeback(inode, index));
450}
451
452
453
454
455
456
457
458
459
460
461static void fuse_sync_writes(struct inode *inode)
462{
463 fuse_set_nowrite(inode);
464 fuse_release_nowrite(inode);
465}
466
467static int fuse_flush(struct file *file, fl_owner_t id)
468{
469 struct inode *inode = file_inode(file);
470 struct fuse_mount *fm = get_fuse_mount(inode);
471 struct fuse_file *ff = file->private_data;
472 struct fuse_flush_in inarg;
473 FUSE_ARGS(args);
474 int err;
475
476 if (fuse_is_bad(inode))
477 return -EIO;
478
479 if (ff->open_flags & FOPEN_NOFLUSH && !fm->fc->writeback_cache)
480 return 0;
481
482 err = write_inode_now(inode, 1);
483 if (err)
484 return err;
485
486 inode_lock(inode);
487 fuse_sync_writes(inode);
488 inode_unlock(inode);
489
490 err = filemap_check_errors(file->f_mapping);
491 if (err)
492 return err;
493
494 err = 0;
495 if (fm->fc->no_flush)
496 goto inval_attr_out;
497
498 memset(&inarg, 0, sizeof(inarg));
499 inarg.fh = ff->fh;
500 inarg.lock_owner = fuse_lock_owner_id(fm->fc, id);
501 args.opcode = FUSE_FLUSH;
502 args.nodeid = get_node_id(inode);
503 args.in_numargs = 1;
504 args.in_args[0].size = sizeof(inarg);
505 args.in_args[0].value = &inarg;
506 args.force = true;
507
508 err = fuse_simple_request(fm, &args);
509 if (err == -ENOSYS) {
510 fm->fc->no_flush = 1;
511 err = 0;
512 }
513
514inval_attr_out:
515
516
517
518
519 if (!err && fm->fc->writeback_cache)
520 fuse_invalidate_attr_mask(inode, STATX_BLOCKS);
521 return err;
522}
523
524int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
525 int datasync, int opcode)
526{
527 struct inode *inode = file->f_mapping->host;
528 struct fuse_mount *fm = get_fuse_mount(inode);
529 struct fuse_file *ff = file->private_data;
530 FUSE_ARGS(args);
531 struct fuse_fsync_in inarg;
532
533 memset(&inarg, 0, sizeof(inarg));
534 inarg.fh = ff->fh;
535 inarg.fsync_flags = datasync ? FUSE_FSYNC_FDATASYNC : 0;
536 args.opcode = opcode;
537 args.nodeid = get_node_id(inode);
538 args.in_numargs = 1;
539 args.in_args[0].size = sizeof(inarg);
540 args.in_args[0].value = &inarg;
541 return fuse_simple_request(fm, &args);
542}
543
544static int fuse_fsync(struct file *file, loff_t start, loff_t end,
545 int datasync)
546{
547 struct inode *inode = file->f_mapping->host;
548 struct fuse_conn *fc = get_fuse_conn(inode);
549 int err;
550
551 if (fuse_is_bad(inode))
552 return -EIO;
553
554 inode_lock(inode);
555
556
557
558
559
560
561 err = file_write_and_wait_range(file, start, end);
562 if (err)
563 goto out;
564
565 fuse_sync_writes(inode);
566
567
568
569
570
571
572 err = file_check_and_advance_wb_err(file);
573 if (err)
574 goto out;
575
576 err = sync_inode_metadata(inode, 1);
577 if (err)
578 goto out;
579
580 if (fc->no_fsync)
581 goto out;
582
583 err = fuse_fsync_common(file, start, end, datasync, FUSE_FSYNC);
584 if (err == -ENOSYS) {
585 fc->no_fsync = 1;
586 err = 0;
587 }
588out:
589 inode_unlock(inode);
590
591 return err;
592}
593
594void fuse_read_args_fill(struct fuse_io_args *ia, struct file *file, loff_t pos,
595 size_t count, int opcode)
596{
597 struct fuse_file *ff = file->private_data;
598 struct fuse_args *args = &ia->ap.args;
599
600 ia->read.in.fh = ff->fh;
601 ia->read.in.offset = pos;
602 ia->read.in.size = count;
603 ia->read.in.flags = file->f_flags;
604 args->opcode = opcode;
605 args->nodeid = ff->nodeid;
606 args->in_numargs = 1;
607 args->in_args[0].size = sizeof(ia->read.in);
608 args->in_args[0].value = &ia->read.in;
609 args->out_argvar = true;
610 args->out_numargs = 1;
611 args->out_args[0].size = count;
612}
613
614static void fuse_release_user_pages(struct fuse_args_pages *ap,
615 bool should_dirty)
616{
617 unsigned int i;
618
619 for (i = 0; i < ap->num_pages; i++) {
620 if (should_dirty)
621 set_page_dirty_lock(ap->pages[i]);
622 put_page(ap->pages[i]);
623 }
624}
625
626static void fuse_io_release(struct kref *kref)
627{
628 kfree(container_of(kref, struct fuse_io_priv, refcnt));
629}
630
631static ssize_t fuse_get_res_by_io(struct fuse_io_priv *io)
632{
633 if (io->err)
634 return io->err;
635
636 if (io->bytes >= 0 && io->write)
637 return -EIO;
638
639 return io->bytes < 0 ? io->size : io->bytes;
640}
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos)
659{
660 int left;
661
662 spin_lock(&io->lock);
663 if (err)
664 io->err = io->err ? : err;
665 else if (pos >= 0 && (io->bytes < 0 || pos < io->bytes))
666 io->bytes = pos;
667
668 left = --io->reqs;
669 if (!left && io->blocking)
670 complete(io->done);
671 spin_unlock(&io->lock);
672
673 if (!left && !io->blocking) {
674 ssize_t res = fuse_get_res_by_io(io);
675
676 if (res >= 0) {
677 struct inode *inode = file_inode(io->iocb->ki_filp);
678 struct fuse_conn *fc = get_fuse_conn(inode);
679 struct fuse_inode *fi = get_fuse_inode(inode);
680
681 spin_lock(&fi->lock);
682 fi->attr_version = atomic64_inc_return(&fc->attr_version);
683 spin_unlock(&fi->lock);
684 }
685
686 io->iocb->ki_complete(io->iocb, res);
687 }
688
689 kref_put(&io->refcnt, fuse_io_release);
690}
691
692static struct fuse_io_args *fuse_io_alloc(struct fuse_io_priv *io,
693 unsigned int npages)
694{
695 struct fuse_io_args *ia;
696
697 ia = kzalloc(sizeof(*ia), GFP_KERNEL);
698 if (ia) {
699 ia->io = io;
700 ia->ap.pages = fuse_pages_alloc(npages, GFP_KERNEL,
701 &ia->ap.descs);
702 if (!ia->ap.pages) {
703 kfree(ia);
704 ia = NULL;
705 }
706 }
707 return ia;
708}
709
710static void fuse_io_free(struct fuse_io_args *ia)
711{
712 kfree(ia->ap.pages);
713 kfree(ia);
714}
715
716static void fuse_aio_complete_req(struct fuse_mount *fm, struct fuse_args *args,
717 int err)
718{
719 struct fuse_io_args *ia = container_of(args, typeof(*ia), ap.args);
720 struct fuse_io_priv *io = ia->io;
721 ssize_t pos = -1;
722
723 fuse_release_user_pages(&ia->ap, io->should_dirty);
724
725 if (err) {
726
727 } else if (io->write) {
728 if (ia->write.out.size > ia->write.in.size) {
729 err = -EIO;
730 } else if (ia->write.in.size != ia->write.out.size) {
731 pos = ia->write.in.offset - io->offset +
732 ia->write.out.size;
733 }
734 } else {
735 u32 outsize = args->out_args[0].size;
736
737 if (ia->read.in.size != outsize)
738 pos = ia->read.in.offset - io->offset + outsize;
739 }
740
741 fuse_aio_complete(io, err, pos);
742 fuse_io_free(ia);
743}
744
745static ssize_t fuse_async_req_send(struct fuse_mount *fm,
746 struct fuse_io_args *ia, size_t num_bytes)
747{
748 ssize_t err;
749 struct fuse_io_priv *io = ia->io;
750
751 spin_lock(&io->lock);
752 kref_get(&io->refcnt);
753 io->size += num_bytes;
754 io->reqs++;
755 spin_unlock(&io->lock);
756
757 ia->ap.args.end = fuse_aio_complete_req;
758 ia->ap.args.may_block = io->should_dirty;
759 err = fuse_simple_background(fm, &ia->ap.args, GFP_KERNEL);
760 if (err)
761 fuse_aio_complete_req(fm, &ia->ap.args, err);
762
763 return num_bytes;
764}
765
766static ssize_t fuse_send_read(struct fuse_io_args *ia, loff_t pos, size_t count,
767 fl_owner_t owner)
768{
769 struct file *file = ia->io->iocb->ki_filp;
770 struct fuse_file *ff = file->private_data;
771 struct fuse_mount *fm = ff->fm;
772
773 fuse_read_args_fill(ia, file, pos, count, FUSE_READ);
774 if (owner != NULL) {
775 ia->read.in.read_flags |= FUSE_READ_LOCKOWNER;
776 ia->read.in.lock_owner = fuse_lock_owner_id(fm->fc, owner);
777 }
778
779 if (ia->io->async)
780 return fuse_async_req_send(fm, ia, count);
781
782 return fuse_simple_request(fm, &ia->ap.args);
783}
784
785static void fuse_read_update_size(struct inode *inode, loff_t size,
786 u64 attr_ver)
787{
788 struct fuse_conn *fc = get_fuse_conn(inode);
789 struct fuse_inode *fi = get_fuse_inode(inode);
790
791 spin_lock(&fi->lock);
792 if (attr_ver >= fi->attr_version && size < inode->i_size &&
793 !test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
794 fi->attr_version = atomic64_inc_return(&fc->attr_version);
795 i_size_write(inode, size);
796 }
797 spin_unlock(&fi->lock);
798}
799
800static void fuse_short_read(struct inode *inode, u64 attr_ver, size_t num_read,
801 struct fuse_args_pages *ap)
802{
803 struct fuse_conn *fc = get_fuse_conn(inode);
804
805
806
807
808
809
810 if (!fc->writeback_cache) {
811 loff_t pos = page_offset(ap->pages[0]) + num_read;
812 fuse_read_update_size(inode, pos, attr_ver);
813 }
814}
815
816static int fuse_do_readpage(struct file *file, struct page *page)
817{
818 struct inode *inode = page->mapping->host;
819 struct fuse_mount *fm = get_fuse_mount(inode);
820 loff_t pos = page_offset(page);
821 struct fuse_page_desc desc = { .length = PAGE_SIZE };
822 struct fuse_io_args ia = {
823 .ap.args.page_zeroing = true,
824 .ap.args.out_pages = true,
825 .ap.num_pages = 1,
826 .ap.pages = &page,
827 .ap.descs = &desc,
828 };
829 ssize_t res;
830 u64 attr_ver;
831
832
833
834
835
836
837 fuse_wait_on_page_writeback(inode, page->index);
838
839 attr_ver = fuse_get_attr_version(fm->fc);
840
841
842 if (pos + (desc.length - 1) == LLONG_MAX)
843 desc.length--;
844
845 fuse_read_args_fill(&ia, file, pos, desc.length, FUSE_READ);
846 res = fuse_simple_request(fm, &ia.ap.args);
847 if (res < 0)
848 return res;
849
850
851
852 if (res < desc.length)
853 fuse_short_read(inode, attr_ver, res, &ia.ap);
854
855 SetPageUptodate(page);
856
857 return 0;
858}
859
860static int fuse_readpage(struct file *file, struct page *page)
861{
862 struct inode *inode = page->mapping->host;
863 int err;
864
865 err = -EIO;
866 if (fuse_is_bad(inode))
867 goto out;
868
869 err = fuse_do_readpage(file, page);
870 fuse_invalidate_atime(inode);
871 out:
872 unlock_page(page);
873 return err;
874}
875
876static void fuse_readpages_end(struct fuse_mount *fm, struct fuse_args *args,
877 int err)
878{
879 int i;
880 struct fuse_io_args *ia = container_of(args, typeof(*ia), ap.args);
881 struct fuse_args_pages *ap = &ia->ap;
882 size_t count = ia->read.in.size;
883 size_t num_read = args->out_args[0].size;
884 struct address_space *mapping = NULL;
885
886 for (i = 0; mapping == NULL && i < ap->num_pages; i++)
887 mapping = ap->pages[i]->mapping;
888
889 if (mapping) {
890 struct inode *inode = mapping->host;
891
892
893
894
895 if (!err && num_read < count)
896 fuse_short_read(inode, ia->read.attr_ver, num_read, ap);
897
898 fuse_invalidate_atime(inode);
899 }
900
901 for (i = 0; i < ap->num_pages; i++) {
902 struct page *page = ap->pages[i];
903
904 if (!err)
905 SetPageUptodate(page);
906 else
907 SetPageError(page);
908 unlock_page(page);
909 put_page(page);
910 }
911 if (ia->ff)
912 fuse_file_put(ia->ff, false, false);
913
914 fuse_io_free(ia);
915}
916
917static void fuse_send_readpages(struct fuse_io_args *ia, struct file *file)
918{
919 struct fuse_file *ff = file->private_data;
920 struct fuse_mount *fm = ff->fm;
921 struct fuse_args_pages *ap = &ia->ap;
922 loff_t pos = page_offset(ap->pages[0]);
923 size_t count = ap->num_pages << PAGE_SHIFT;
924 ssize_t res;
925 int err;
926
927 ap->args.out_pages = true;
928 ap->args.page_zeroing = true;
929 ap->args.page_replace = true;
930
931
932 if (pos + (count - 1) == LLONG_MAX) {
933 count--;
934 ap->descs[ap->num_pages - 1].length--;
935 }
936 WARN_ON((loff_t) (pos + count) < 0);
937
938 fuse_read_args_fill(ia, file, pos, count, FUSE_READ);
939 ia->read.attr_ver = fuse_get_attr_version(fm->fc);
940 if (fm->fc->async_read) {
941 ia->ff = fuse_file_get(ff);
942 ap->args.end = fuse_readpages_end;
943 err = fuse_simple_background(fm, &ap->args, GFP_KERNEL);
944 if (!err)
945 return;
946 } else {
947 res = fuse_simple_request(fm, &ap->args);
948 err = res < 0 ? res : 0;
949 }
950 fuse_readpages_end(fm, &ap->args, err);
951}
952
953static void fuse_readahead(struct readahead_control *rac)
954{
955 struct inode *inode = rac->mapping->host;
956 struct fuse_conn *fc = get_fuse_conn(inode);
957 unsigned int i, max_pages, nr_pages = 0;
958
959 if (fuse_is_bad(inode))
960 return;
961
962 max_pages = min_t(unsigned int, fc->max_pages,
963 fc->max_read / PAGE_SIZE);
964
965 for (;;) {
966 struct fuse_io_args *ia;
967 struct fuse_args_pages *ap;
968
969 nr_pages = readahead_count(rac) - nr_pages;
970 if (nr_pages > max_pages)
971 nr_pages = max_pages;
972 if (nr_pages == 0)
973 break;
974 ia = fuse_io_alloc(NULL, nr_pages);
975 if (!ia)
976 return;
977 ap = &ia->ap;
978 nr_pages = __readahead_batch(rac, ap->pages, nr_pages);
979 for (i = 0; i < nr_pages; i++) {
980 fuse_wait_on_page_writeback(inode,
981 readahead_index(rac) + i);
982 ap->descs[i].length = PAGE_SIZE;
983 }
984 ap->num_pages = nr_pages;
985 fuse_send_readpages(ia, rac->file);
986 }
987}
988
989static ssize_t fuse_cache_read_iter(struct kiocb *iocb, struct iov_iter *to)
990{
991 struct inode *inode = iocb->ki_filp->f_mapping->host;
992 struct fuse_conn *fc = get_fuse_conn(inode);
993
994
995
996
997
998
999 if (fc->auto_inval_data ||
1000 (iocb->ki_pos + iov_iter_count(to) > i_size_read(inode))) {
1001 int err;
1002 err = fuse_update_attributes(inode, iocb->ki_filp, STATX_SIZE);
1003 if (err)
1004 return err;
1005 }
1006
1007 return generic_file_read_iter(iocb, to);
1008}
1009
1010static void fuse_write_args_fill(struct fuse_io_args *ia, struct fuse_file *ff,
1011 loff_t pos, size_t count)
1012{
1013 struct fuse_args *args = &ia->ap.args;
1014
1015 ia->write.in.fh = ff->fh;
1016 ia->write.in.offset = pos;
1017 ia->write.in.size = count;
1018 args->opcode = FUSE_WRITE;
1019 args->nodeid = ff->nodeid;
1020 args->in_numargs = 2;
1021 if (ff->fm->fc->minor < 9)
1022 args->in_args[0].size = FUSE_COMPAT_WRITE_IN_SIZE;
1023 else
1024 args->in_args[0].size = sizeof(ia->write.in);
1025 args->in_args[0].value = &ia->write.in;
1026 args->in_args[1].size = count;
1027 args->out_numargs = 1;
1028 args->out_args[0].size = sizeof(ia->write.out);
1029 args->out_args[0].value = &ia->write.out;
1030}
1031
1032static unsigned int fuse_write_flags(struct kiocb *iocb)
1033{
1034 unsigned int flags = iocb->ki_filp->f_flags;
1035
1036 if (iocb->ki_flags & IOCB_DSYNC)
1037 flags |= O_DSYNC;
1038 if (iocb->ki_flags & IOCB_SYNC)
1039 flags |= O_SYNC;
1040
1041 return flags;
1042}
1043
1044static ssize_t fuse_send_write(struct fuse_io_args *ia, loff_t pos,
1045 size_t count, fl_owner_t owner)
1046{
1047 struct kiocb *iocb = ia->io->iocb;
1048 struct file *file = iocb->ki_filp;
1049 struct fuse_file *ff = file->private_data;
1050 struct fuse_mount *fm = ff->fm;
1051 struct fuse_write_in *inarg = &ia->write.in;
1052 ssize_t err;
1053
1054 fuse_write_args_fill(ia, ff, pos, count);
1055 inarg->flags = fuse_write_flags(iocb);
1056 if (owner != NULL) {
1057 inarg->write_flags |= FUSE_WRITE_LOCKOWNER;
1058 inarg->lock_owner = fuse_lock_owner_id(fm->fc, owner);
1059 }
1060
1061 if (ia->io->async)
1062 return fuse_async_req_send(fm, ia, count);
1063
1064 err = fuse_simple_request(fm, &ia->ap.args);
1065 if (!err && ia->write.out.size > count)
1066 err = -EIO;
1067
1068 return err ?: ia->write.out.size;
1069}
1070
1071bool fuse_write_update_attr(struct inode *inode, loff_t pos, ssize_t written)
1072{
1073 struct fuse_conn *fc = get_fuse_conn(inode);
1074 struct fuse_inode *fi = get_fuse_inode(inode);
1075 bool ret = false;
1076
1077 spin_lock(&fi->lock);
1078 fi->attr_version = atomic64_inc_return(&fc->attr_version);
1079 if (written > 0 && pos > inode->i_size) {
1080 i_size_write(inode, pos);
1081 ret = true;
1082 }
1083 spin_unlock(&fi->lock);
1084
1085 fuse_invalidate_attr_mask(inode, FUSE_STATX_MODSIZE);
1086
1087 return ret;
1088}
1089
1090static ssize_t fuse_send_write_pages(struct fuse_io_args *ia,
1091 struct kiocb *iocb, struct inode *inode,
1092 loff_t pos, size_t count)
1093{
1094 struct fuse_args_pages *ap = &ia->ap;
1095 struct file *file = iocb->ki_filp;
1096 struct fuse_file *ff = file->private_data;
1097 struct fuse_mount *fm = ff->fm;
1098 unsigned int offset, i;
1099 bool short_write;
1100 int err;
1101
1102 for (i = 0; i < ap->num_pages; i++)
1103 fuse_wait_on_page_writeback(inode, ap->pages[i]->index);
1104
1105 fuse_write_args_fill(ia, ff, pos, count);
1106 ia->write.in.flags = fuse_write_flags(iocb);
1107 if (fm->fc->handle_killpriv_v2 && !capable(CAP_FSETID))
1108 ia->write.in.write_flags |= FUSE_WRITE_KILL_SUIDGID;
1109
1110 err = fuse_simple_request(fm, &ap->args);
1111 if (!err && ia->write.out.size > count)
1112 err = -EIO;
1113
1114 short_write = ia->write.out.size < count;
1115 offset = ap->descs[0].offset;
1116 count = ia->write.out.size;
1117 for (i = 0; i < ap->num_pages; i++) {
1118 struct page *page = ap->pages[i];
1119
1120 if (err) {
1121 ClearPageUptodate(page);
1122 } else {
1123 if (count >= PAGE_SIZE - offset)
1124 count -= PAGE_SIZE - offset;
1125 else {
1126 if (short_write)
1127 ClearPageUptodate(page);
1128 count = 0;
1129 }
1130 offset = 0;
1131 }
1132 if (ia->write.page_locked && (i == ap->num_pages - 1))
1133 unlock_page(page);
1134 put_page(page);
1135 }
1136
1137 return err;
1138}
1139
1140static ssize_t fuse_fill_write_pages(struct fuse_io_args *ia,
1141 struct address_space *mapping,
1142 struct iov_iter *ii, loff_t pos,
1143 unsigned int max_pages)
1144{
1145 struct fuse_args_pages *ap = &ia->ap;
1146 struct fuse_conn *fc = get_fuse_conn(mapping->host);
1147 unsigned offset = pos & (PAGE_SIZE - 1);
1148 size_t count = 0;
1149 int err;
1150
1151 ap->args.in_pages = true;
1152 ap->descs[0].offset = offset;
1153
1154 do {
1155 size_t tmp;
1156 struct page *page;
1157 pgoff_t index = pos >> PAGE_SHIFT;
1158 size_t bytes = min_t(size_t, PAGE_SIZE - offset,
1159 iov_iter_count(ii));
1160
1161 bytes = min_t(size_t, bytes, fc->max_write - count);
1162
1163 again:
1164 err = -EFAULT;
1165 if (fault_in_iov_iter_readable(ii, bytes))
1166 break;
1167
1168 err = -ENOMEM;
1169 page = grab_cache_page_write_begin(mapping, index, 0);
1170 if (!page)
1171 break;
1172
1173 if (mapping_writably_mapped(mapping))
1174 flush_dcache_page(page);
1175
1176 tmp = copy_page_from_iter_atomic(page, offset, bytes, ii);
1177 flush_dcache_page(page);
1178
1179 if (!tmp) {
1180 unlock_page(page);
1181 put_page(page);
1182 goto again;
1183 }
1184
1185 err = 0;
1186 ap->pages[ap->num_pages] = page;
1187 ap->descs[ap->num_pages].length = tmp;
1188 ap->num_pages++;
1189
1190 count += tmp;
1191 pos += tmp;
1192 offset += tmp;
1193 if (offset == PAGE_SIZE)
1194 offset = 0;
1195
1196
1197 if (tmp == PAGE_SIZE)
1198 SetPageUptodate(page);
1199
1200 if (PageUptodate(page)) {
1201 unlock_page(page);
1202 } else {
1203 ia->write.page_locked = true;
1204 break;
1205 }
1206 if (!fc->big_writes)
1207 break;
1208 } while (iov_iter_count(ii) && count < fc->max_write &&
1209 ap->num_pages < max_pages && offset == 0);
1210
1211 return count > 0 ? count : err;
1212}
1213
1214static inline unsigned int fuse_wr_pages(loff_t pos, size_t len,
1215 unsigned int max_pages)
1216{
1217 return min_t(unsigned int,
1218 ((pos + len - 1) >> PAGE_SHIFT) -
1219 (pos >> PAGE_SHIFT) + 1,
1220 max_pages);
1221}
1222
1223static ssize_t fuse_perform_write(struct kiocb *iocb,
1224 struct address_space *mapping,
1225 struct iov_iter *ii, loff_t pos)
1226{
1227 struct inode *inode = mapping->host;
1228 struct fuse_conn *fc = get_fuse_conn(inode);
1229 struct fuse_inode *fi = get_fuse_inode(inode);
1230 int err = 0;
1231 ssize_t res = 0;
1232
1233 if (inode->i_size < pos + iov_iter_count(ii))
1234 set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
1235
1236 do {
1237 ssize_t count;
1238 struct fuse_io_args ia = {};
1239 struct fuse_args_pages *ap = &ia.ap;
1240 unsigned int nr_pages = fuse_wr_pages(pos, iov_iter_count(ii),
1241 fc->max_pages);
1242
1243 ap->pages = fuse_pages_alloc(nr_pages, GFP_KERNEL, &ap->descs);
1244 if (!ap->pages) {
1245 err = -ENOMEM;
1246 break;
1247 }
1248
1249 count = fuse_fill_write_pages(&ia, mapping, ii, pos, nr_pages);
1250 if (count <= 0) {
1251 err = count;
1252 } else {
1253 err = fuse_send_write_pages(&ia, iocb, inode,
1254 pos, count);
1255 if (!err) {
1256 size_t num_written = ia.write.out.size;
1257
1258 res += num_written;
1259 pos += num_written;
1260
1261
1262 if (num_written != count)
1263 err = -EIO;
1264 }
1265 }
1266 kfree(ap->pages);
1267 } while (!err && iov_iter_count(ii));
1268
1269 fuse_write_update_attr(inode, pos, res);
1270 clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
1271
1272 return res > 0 ? res : err;
1273}
1274
1275static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
1276{
1277 struct file *file = iocb->ki_filp;
1278 struct address_space *mapping = file->f_mapping;
1279 ssize_t written = 0;
1280 ssize_t written_buffered = 0;
1281 struct inode *inode = mapping->host;
1282 ssize_t err;
1283 struct fuse_conn *fc = get_fuse_conn(inode);
1284 loff_t endbyte = 0;
1285
1286 if (fc->writeback_cache) {
1287
1288 err = fuse_update_attributes(mapping->host, file,
1289 STATX_SIZE | STATX_MODE);
1290 if (err)
1291 return err;
1292
1293 if (fc->handle_killpriv_v2 &&
1294 should_remove_suid(file_dentry(file))) {
1295 goto writethrough;
1296 }
1297
1298 return generic_file_write_iter(iocb, from);
1299 }
1300
1301writethrough:
1302 inode_lock(inode);
1303
1304
1305 current->backing_dev_info = inode_to_bdi(inode);
1306
1307 err = generic_write_checks(iocb, from);
1308 if (err <= 0)
1309 goto out;
1310
1311 err = file_remove_privs(file);
1312 if (err)
1313 goto out;
1314
1315 err = file_update_time(file);
1316 if (err)
1317 goto out;
1318
1319 if (iocb->ki_flags & IOCB_DIRECT) {
1320 loff_t pos = iocb->ki_pos;
1321 written = generic_file_direct_write(iocb, from);
1322 if (written < 0 || !iov_iter_count(from))
1323 goto out;
1324
1325 pos += written;
1326
1327 written_buffered = fuse_perform_write(iocb, mapping, from, pos);
1328 if (written_buffered < 0) {
1329 err = written_buffered;
1330 goto out;
1331 }
1332 endbyte = pos + written_buffered - 1;
1333
1334 err = filemap_write_and_wait_range(file->f_mapping, pos,
1335 endbyte);
1336 if (err)
1337 goto out;
1338
1339 invalidate_mapping_pages(file->f_mapping,
1340 pos >> PAGE_SHIFT,
1341 endbyte >> PAGE_SHIFT);
1342
1343 written += written_buffered;
1344 iocb->ki_pos = pos + written_buffered;
1345 } else {
1346 written = fuse_perform_write(iocb, mapping, from, iocb->ki_pos);
1347 if (written >= 0)
1348 iocb->ki_pos += written;
1349 }
1350out:
1351 current->backing_dev_info = NULL;
1352 inode_unlock(inode);
1353 if (written > 0)
1354 written = generic_write_sync(iocb, written);
1355
1356 return written ? written : err;
1357}
1358
1359static inline unsigned long fuse_get_user_addr(const struct iov_iter *ii)
1360{
1361 return (unsigned long)ii->iov->iov_base + ii->iov_offset;
1362}
1363
1364static inline size_t fuse_get_frag_size(const struct iov_iter *ii,
1365 size_t max_size)
1366{
1367 return min(iov_iter_single_seg_count(ii), max_size);
1368}
1369
1370static int fuse_get_user_pages(struct fuse_args_pages *ap, struct iov_iter *ii,
1371 size_t *nbytesp, int write,
1372 unsigned int max_pages)
1373{
1374 size_t nbytes = 0;
1375 ssize_t ret = 0;
1376
1377
1378 if (iov_iter_is_kvec(ii)) {
1379 unsigned long user_addr = fuse_get_user_addr(ii);
1380 size_t frag_size = fuse_get_frag_size(ii, *nbytesp);
1381
1382 if (write)
1383 ap->args.in_args[1].value = (void *) user_addr;
1384 else
1385 ap->args.out_args[0].value = (void *) user_addr;
1386
1387 iov_iter_advance(ii, frag_size);
1388 *nbytesp = frag_size;
1389 return 0;
1390 }
1391
1392 while (nbytes < *nbytesp && ap->num_pages < max_pages) {
1393 unsigned npages;
1394 size_t start;
1395 ret = iov_iter_get_pages(ii, &ap->pages[ap->num_pages],
1396 *nbytesp - nbytes,
1397 max_pages - ap->num_pages,
1398 &start);
1399 if (ret < 0)
1400 break;
1401
1402 iov_iter_advance(ii, ret);
1403 nbytes += ret;
1404
1405 ret += start;
1406 npages = DIV_ROUND_UP(ret, PAGE_SIZE);
1407
1408 ap->descs[ap->num_pages].offset = start;
1409 fuse_page_descs_length_init(ap->descs, ap->num_pages, npages);
1410
1411 ap->num_pages += npages;
1412 ap->descs[ap->num_pages - 1].length -=
1413 (PAGE_SIZE - ret) & (PAGE_SIZE - 1);
1414 }
1415
1416 ap->args.user_pages = true;
1417 if (write)
1418 ap->args.in_pages = true;
1419 else
1420 ap->args.out_pages = true;
1421
1422 *nbytesp = nbytes;
1423
1424 return ret < 0 ? ret : 0;
1425}
1426
1427ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
1428 loff_t *ppos, int flags)
1429{
1430 int write = flags & FUSE_DIO_WRITE;
1431 int cuse = flags & FUSE_DIO_CUSE;
1432 struct file *file = io->iocb->ki_filp;
1433 struct inode *inode = file->f_mapping->host;
1434 struct fuse_file *ff = file->private_data;
1435 struct fuse_conn *fc = ff->fm->fc;
1436 size_t nmax = write ? fc->max_write : fc->max_read;
1437 loff_t pos = *ppos;
1438 size_t count = iov_iter_count(iter);
1439 pgoff_t idx_from = pos >> PAGE_SHIFT;
1440 pgoff_t idx_to = (pos + count - 1) >> PAGE_SHIFT;
1441 ssize_t res = 0;
1442 int err = 0;
1443 struct fuse_io_args *ia;
1444 unsigned int max_pages;
1445
1446 max_pages = iov_iter_npages(iter, fc->max_pages);
1447 ia = fuse_io_alloc(io, max_pages);
1448 if (!ia)
1449 return -ENOMEM;
1450
1451 if (!cuse && fuse_range_is_writeback(inode, idx_from, idx_to)) {
1452 if (!write)
1453 inode_lock(inode);
1454 fuse_sync_writes(inode);
1455 if (!write)
1456 inode_unlock(inode);
1457 }
1458
1459 io->should_dirty = !write && iter_is_iovec(iter);
1460 while (count) {
1461 ssize_t nres;
1462 fl_owner_t owner = current->files;
1463 size_t nbytes = min(count, nmax);
1464
1465 err = fuse_get_user_pages(&ia->ap, iter, &nbytes, write,
1466 max_pages);
1467 if (err && !nbytes)
1468 break;
1469
1470 if (write) {
1471 if (!capable(CAP_FSETID))
1472 ia->write.in.write_flags |= FUSE_WRITE_KILL_SUIDGID;
1473
1474 nres = fuse_send_write(ia, pos, nbytes, owner);
1475 } else {
1476 nres = fuse_send_read(ia, pos, nbytes, owner);
1477 }
1478
1479 if (!io->async || nres < 0) {
1480 fuse_release_user_pages(&ia->ap, io->should_dirty);
1481 fuse_io_free(ia);
1482 }
1483 ia = NULL;
1484 if (nres < 0) {
1485 iov_iter_revert(iter, nbytes);
1486 err = nres;
1487 break;
1488 }
1489 WARN_ON(nres > nbytes);
1490
1491 count -= nres;
1492 res += nres;
1493 pos += nres;
1494 if (nres != nbytes) {
1495 iov_iter_revert(iter, nbytes - nres);
1496 break;
1497 }
1498 if (count) {
1499 max_pages = iov_iter_npages(iter, fc->max_pages);
1500 ia = fuse_io_alloc(io, max_pages);
1501 if (!ia)
1502 break;
1503 }
1504 }
1505 if (ia)
1506 fuse_io_free(ia);
1507 if (res > 0)
1508 *ppos = pos;
1509
1510 return res > 0 ? res : err;
1511}
1512EXPORT_SYMBOL_GPL(fuse_direct_io);
1513
1514static ssize_t __fuse_direct_read(struct fuse_io_priv *io,
1515 struct iov_iter *iter,
1516 loff_t *ppos)
1517{
1518 ssize_t res;
1519 struct inode *inode = file_inode(io->iocb->ki_filp);
1520
1521 res = fuse_direct_io(io, iter, ppos, 0);
1522
1523 fuse_invalidate_atime(inode);
1524
1525 return res;
1526}
1527
1528static ssize_t fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter);
1529
1530static ssize_t fuse_direct_read_iter(struct kiocb *iocb, struct iov_iter *to)
1531{
1532 ssize_t res;
1533
1534 if (!is_sync_kiocb(iocb) && iocb->ki_flags & IOCB_DIRECT) {
1535 res = fuse_direct_IO(iocb, to);
1536 } else {
1537 struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb);
1538
1539 res = __fuse_direct_read(&io, to, &iocb->ki_pos);
1540 }
1541
1542 return res;
1543}
1544
1545static ssize_t fuse_direct_write_iter(struct kiocb *iocb, struct iov_iter *from)
1546{
1547 struct inode *inode = file_inode(iocb->ki_filp);
1548 struct fuse_io_priv io = FUSE_IO_PRIV_SYNC(iocb);
1549 ssize_t res;
1550
1551
1552 inode_lock(inode);
1553 res = generic_write_checks(iocb, from);
1554 if (res > 0) {
1555 if (!is_sync_kiocb(iocb) && iocb->ki_flags & IOCB_DIRECT) {
1556 res = fuse_direct_IO(iocb, from);
1557 } else {
1558 res = fuse_direct_io(&io, from, &iocb->ki_pos,
1559 FUSE_DIO_WRITE);
1560 fuse_write_update_attr(inode, iocb->ki_pos, res);
1561 }
1562 }
1563 inode_unlock(inode);
1564
1565 return res;
1566}
1567
1568static ssize_t fuse_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
1569{
1570 struct file *file = iocb->ki_filp;
1571 struct fuse_file *ff = file->private_data;
1572 struct inode *inode = file_inode(file);
1573
1574 if (fuse_is_bad(inode))
1575 return -EIO;
1576
1577 if (FUSE_IS_DAX(inode))
1578 return fuse_dax_read_iter(iocb, to);
1579
1580 if (!(ff->open_flags & FOPEN_DIRECT_IO))
1581 return fuse_cache_read_iter(iocb, to);
1582 else
1583 return fuse_direct_read_iter(iocb, to);
1584}
1585
1586static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
1587{
1588 struct file *file = iocb->ki_filp;
1589 struct fuse_file *ff = file->private_data;
1590 struct inode *inode = file_inode(file);
1591
1592 if (fuse_is_bad(inode))
1593 return -EIO;
1594
1595 if (FUSE_IS_DAX(inode))
1596 return fuse_dax_write_iter(iocb, from);
1597
1598 if (!(ff->open_flags & FOPEN_DIRECT_IO))
1599 return fuse_cache_write_iter(iocb, from);
1600 else
1601 return fuse_direct_write_iter(iocb, from);
1602}
1603
1604static void fuse_writepage_free(struct fuse_writepage_args *wpa)
1605{
1606 struct fuse_args_pages *ap = &wpa->ia.ap;
1607 int i;
1608
1609 if (wpa->bucket)
1610 fuse_sync_bucket_dec(wpa->bucket);
1611
1612 for (i = 0; i < ap->num_pages; i++)
1613 __free_page(ap->pages[i]);
1614
1615 if (wpa->ia.ff)
1616 fuse_file_put(wpa->ia.ff, false, false);
1617
1618 kfree(ap->pages);
1619 kfree(wpa);
1620}
1621
1622static void fuse_writepage_finish(struct fuse_mount *fm,
1623 struct fuse_writepage_args *wpa)
1624{
1625 struct fuse_args_pages *ap = &wpa->ia.ap;
1626 struct inode *inode = wpa->inode;
1627 struct fuse_inode *fi = get_fuse_inode(inode);
1628 struct backing_dev_info *bdi = inode_to_bdi(inode);
1629 int i;
1630
1631 for (i = 0; i < ap->num_pages; i++) {
1632 dec_wb_stat(&bdi->wb, WB_WRITEBACK);
1633 dec_node_page_state(ap->pages[i], NR_WRITEBACK_TEMP);
1634 wb_writeout_inc(&bdi->wb);
1635 }
1636 wake_up(&fi->page_waitq);
1637}
1638
1639
1640static void fuse_send_writepage(struct fuse_mount *fm,
1641 struct fuse_writepage_args *wpa, loff_t size)
1642__releases(fi->lock)
1643__acquires(fi->lock)
1644{
1645 struct fuse_writepage_args *aux, *next;
1646 struct fuse_inode *fi = get_fuse_inode(wpa->inode);
1647 struct fuse_write_in *inarg = &wpa->ia.write.in;
1648 struct fuse_args *args = &wpa->ia.ap.args;
1649 __u64 data_size = wpa->ia.ap.num_pages * PAGE_SIZE;
1650 int err;
1651
1652 fi->writectr++;
1653 if (inarg->offset + data_size <= size) {
1654 inarg->size = data_size;
1655 } else if (inarg->offset < size) {
1656 inarg->size = size - inarg->offset;
1657 } else {
1658
1659 goto out_free;
1660 }
1661
1662 args->in_args[1].size = inarg->size;
1663 args->force = true;
1664 args->nocreds = true;
1665
1666 err = fuse_simple_background(fm, args, GFP_ATOMIC);
1667 if (err == -ENOMEM) {
1668 spin_unlock(&fi->lock);
1669 err = fuse_simple_background(fm, args, GFP_NOFS | __GFP_NOFAIL);
1670 spin_lock(&fi->lock);
1671 }
1672
1673
1674 if (unlikely(err))
1675 goto out_free;
1676
1677 return;
1678
1679 out_free:
1680 fi->writectr--;
1681 rb_erase(&wpa->writepages_entry, &fi->writepages);
1682 fuse_writepage_finish(fm, wpa);
1683 spin_unlock(&fi->lock);
1684
1685
1686 for (aux = wpa->next; aux; aux = next) {
1687 next = aux->next;
1688 aux->next = NULL;
1689 fuse_writepage_free(aux);
1690 }
1691
1692 fuse_writepage_free(wpa);
1693 spin_lock(&fi->lock);
1694}
1695
1696
1697
1698
1699
1700
1701
1702void fuse_flush_writepages(struct inode *inode)
1703__releases(fi->lock)
1704__acquires(fi->lock)
1705{
1706 struct fuse_mount *fm = get_fuse_mount(inode);
1707 struct fuse_inode *fi = get_fuse_inode(inode);
1708 loff_t crop = i_size_read(inode);
1709 struct fuse_writepage_args *wpa;
1710
1711 while (fi->writectr >= 0 && !list_empty(&fi->queued_writes)) {
1712 wpa = list_entry(fi->queued_writes.next,
1713 struct fuse_writepage_args, queue_entry);
1714 list_del_init(&wpa->queue_entry);
1715 fuse_send_writepage(fm, wpa, crop);
1716 }
1717}
1718
1719static struct fuse_writepage_args *fuse_insert_writeback(struct rb_root *root,
1720 struct fuse_writepage_args *wpa)
1721{
1722 pgoff_t idx_from = wpa->ia.write.in.offset >> PAGE_SHIFT;
1723 pgoff_t idx_to = idx_from + wpa->ia.ap.num_pages - 1;
1724 struct rb_node **p = &root->rb_node;
1725 struct rb_node *parent = NULL;
1726
1727 WARN_ON(!wpa->ia.ap.num_pages);
1728 while (*p) {
1729 struct fuse_writepage_args *curr;
1730 pgoff_t curr_index;
1731
1732 parent = *p;
1733 curr = rb_entry(parent, struct fuse_writepage_args,
1734 writepages_entry);
1735 WARN_ON(curr->inode != wpa->inode);
1736 curr_index = curr->ia.write.in.offset >> PAGE_SHIFT;
1737
1738 if (idx_from >= curr_index + curr->ia.ap.num_pages)
1739 p = &(*p)->rb_right;
1740 else if (idx_to < curr_index)
1741 p = &(*p)->rb_left;
1742 else
1743 return curr;
1744 }
1745
1746 rb_link_node(&wpa->writepages_entry, parent, p);
1747 rb_insert_color(&wpa->writepages_entry, root);
1748 return NULL;
1749}
1750
1751static void tree_insert(struct rb_root *root, struct fuse_writepage_args *wpa)
1752{
1753 WARN_ON(fuse_insert_writeback(root, wpa));
1754}
1755
1756static void fuse_writepage_end(struct fuse_mount *fm, struct fuse_args *args,
1757 int error)
1758{
1759 struct fuse_writepage_args *wpa =
1760 container_of(args, typeof(*wpa), ia.ap.args);
1761 struct inode *inode = wpa->inode;
1762 struct fuse_inode *fi = get_fuse_inode(inode);
1763 struct fuse_conn *fc = get_fuse_conn(inode);
1764
1765 mapping_set_error(inode->i_mapping, error);
1766
1767
1768
1769
1770
1771
1772 if (!fc->writeback_cache)
1773 fuse_invalidate_attr_mask(inode, FUSE_STATX_MODIFY);
1774 spin_lock(&fi->lock);
1775 rb_erase(&wpa->writepages_entry, &fi->writepages);
1776 while (wpa->next) {
1777 struct fuse_mount *fm = get_fuse_mount(inode);
1778 struct fuse_write_in *inarg = &wpa->ia.write.in;
1779 struct fuse_writepage_args *next = wpa->next;
1780
1781 wpa->next = next->next;
1782 next->next = NULL;
1783 next->ia.ff = fuse_file_get(wpa->ia.ff);
1784 tree_insert(&fi->writepages, next);
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809 fuse_send_writepage(fm, next, inarg->offset + inarg->size);
1810 }
1811 fi->writectr--;
1812 fuse_writepage_finish(fm, wpa);
1813 spin_unlock(&fi->lock);
1814 fuse_writepage_free(wpa);
1815}
1816
1817static struct fuse_file *__fuse_write_file_get(struct fuse_inode *fi)
1818{
1819 struct fuse_file *ff;
1820
1821 spin_lock(&fi->lock);
1822 ff = list_first_entry_or_null(&fi->write_files, struct fuse_file,
1823 write_entry);
1824 if (ff)
1825 fuse_file_get(ff);
1826 spin_unlock(&fi->lock);
1827
1828 return ff;
1829}
1830
1831static struct fuse_file *fuse_write_file_get(struct fuse_inode *fi)
1832{
1833 struct fuse_file *ff = __fuse_write_file_get(fi);
1834 WARN_ON(!ff);
1835 return ff;
1836}
1837
1838int fuse_write_inode(struct inode *inode, struct writeback_control *wbc)
1839{
1840 struct fuse_inode *fi = get_fuse_inode(inode);
1841 struct fuse_file *ff;
1842 int err;
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853 WARN_ON(wbc->for_reclaim);
1854
1855 ff = __fuse_write_file_get(fi);
1856 err = fuse_flush_times(inode, ff);
1857 if (ff)
1858 fuse_file_put(ff, false, false);
1859
1860 return err;
1861}
1862
1863static struct fuse_writepage_args *fuse_writepage_args_alloc(void)
1864{
1865 struct fuse_writepage_args *wpa;
1866 struct fuse_args_pages *ap;
1867
1868 wpa = kzalloc(sizeof(*wpa), GFP_NOFS);
1869 if (wpa) {
1870 ap = &wpa->ia.ap;
1871 ap->num_pages = 0;
1872 ap->pages = fuse_pages_alloc(1, GFP_NOFS, &ap->descs);
1873 if (!ap->pages) {
1874 kfree(wpa);
1875 wpa = NULL;
1876 }
1877 }
1878 return wpa;
1879
1880}
1881
1882static void fuse_writepage_add_to_bucket(struct fuse_conn *fc,
1883 struct fuse_writepage_args *wpa)
1884{
1885 if (!fc->sync_fs)
1886 return;
1887
1888 rcu_read_lock();
1889
1890 do {
1891 wpa->bucket = rcu_dereference(fc->curr_bucket);
1892 } while (unlikely(!atomic_inc_not_zero(&wpa->bucket->count)));
1893 rcu_read_unlock();
1894}
1895
1896static int fuse_writepage_locked(struct page *page)
1897{
1898 struct address_space *mapping = page->mapping;
1899 struct inode *inode = mapping->host;
1900 struct fuse_conn *fc = get_fuse_conn(inode);
1901 struct fuse_inode *fi = get_fuse_inode(inode);
1902 struct fuse_writepage_args *wpa;
1903 struct fuse_args_pages *ap;
1904 struct page *tmp_page;
1905 int error = -ENOMEM;
1906
1907 set_page_writeback(page);
1908
1909 wpa = fuse_writepage_args_alloc();
1910 if (!wpa)
1911 goto err;
1912 ap = &wpa->ia.ap;
1913
1914 tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
1915 if (!tmp_page)
1916 goto err_free;
1917
1918 error = -EIO;
1919 wpa->ia.ff = fuse_write_file_get(fi);
1920 if (!wpa->ia.ff)
1921 goto err_nofile;
1922
1923 fuse_writepage_add_to_bucket(fc, wpa);
1924 fuse_write_args_fill(&wpa->ia, wpa->ia.ff, page_offset(page), 0);
1925
1926 copy_highpage(tmp_page, page);
1927 wpa->ia.write.in.write_flags |= FUSE_WRITE_CACHE;
1928 wpa->next = NULL;
1929 ap->args.in_pages = true;
1930 ap->num_pages = 1;
1931 ap->pages[0] = tmp_page;
1932 ap->descs[0].offset = 0;
1933 ap->descs[0].length = PAGE_SIZE;
1934 ap->args.end = fuse_writepage_end;
1935 wpa->inode = inode;
1936
1937 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
1938 inc_node_page_state(tmp_page, NR_WRITEBACK_TEMP);
1939
1940 spin_lock(&fi->lock);
1941 tree_insert(&fi->writepages, wpa);
1942 list_add_tail(&wpa->queue_entry, &fi->queued_writes);
1943 fuse_flush_writepages(inode);
1944 spin_unlock(&fi->lock);
1945
1946 end_page_writeback(page);
1947
1948 return 0;
1949
1950err_nofile:
1951 __free_page(tmp_page);
1952err_free:
1953 kfree(wpa);
1954err:
1955 mapping_set_error(page->mapping, error);
1956 end_page_writeback(page);
1957 return error;
1958}
1959
1960static int fuse_writepage(struct page *page, struct writeback_control *wbc)
1961{
1962 int err;
1963
1964 if (fuse_page_is_writeback(page->mapping->host, page->index)) {
1965
1966
1967
1968
1969
1970 WARN_ON(wbc->sync_mode == WB_SYNC_ALL);
1971
1972 redirty_page_for_writepage(wbc, page);
1973 unlock_page(page);
1974 return 0;
1975 }
1976
1977 err = fuse_writepage_locked(page);
1978 unlock_page(page);
1979
1980 return err;
1981}
1982
1983struct fuse_fill_wb_data {
1984 struct fuse_writepage_args *wpa;
1985 struct fuse_file *ff;
1986 struct inode *inode;
1987 struct page **orig_pages;
1988 unsigned int max_pages;
1989};
1990
1991static bool fuse_pages_realloc(struct fuse_fill_wb_data *data)
1992{
1993 struct fuse_args_pages *ap = &data->wpa->ia.ap;
1994 struct fuse_conn *fc = get_fuse_conn(data->inode);
1995 struct page **pages;
1996 struct fuse_page_desc *descs;
1997 unsigned int npages = min_t(unsigned int,
1998 max_t(unsigned int, data->max_pages * 2,
1999 FUSE_DEFAULT_MAX_PAGES_PER_REQ),
2000 fc->max_pages);
2001 WARN_ON(npages <= data->max_pages);
2002
2003 pages = fuse_pages_alloc(npages, GFP_NOFS, &descs);
2004 if (!pages)
2005 return false;
2006
2007 memcpy(pages, ap->pages, sizeof(struct page *) * ap->num_pages);
2008 memcpy(descs, ap->descs, sizeof(struct fuse_page_desc) * ap->num_pages);
2009 kfree(ap->pages);
2010 ap->pages = pages;
2011 ap->descs = descs;
2012 data->max_pages = npages;
2013
2014 return true;
2015}
2016
2017static void fuse_writepages_send(struct fuse_fill_wb_data *data)
2018{
2019 struct fuse_writepage_args *wpa = data->wpa;
2020 struct inode *inode = data->inode;
2021 struct fuse_inode *fi = get_fuse_inode(inode);
2022 int num_pages = wpa->ia.ap.num_pages;
2023 int i;
2024
2025 wpa->ia.ff = fuse_file_get(data->ff);
2026 spin_lock(&fi->lock);
2027 list_add_tail(&wpa->queue_entry, &fi->queued_writes);
2028 fuse_flush_writepages(inode);
2029 spin_unlock(&fi->lock);
2030
2031 for (i = 0; i < num_pages; i++)
2032 end_page_writeback(data->orig_pages[i]);
2033}
2034
2035
2036
2037
2038
2039
2040
2041
2042static bool fuse_writepage_add(struct fuse_writepage_args *new_wpa,
2043 struct page *page)
2044{
2045 struct fuse_inode *fi = get_fuse_inode(new_wpa->inode);
2046 struct fuse_writepage_args *tmp;
2047 struct fuse_writepage_args *old_wpa;
2048 struct fuse_args_pages *new_ap = &new_wpa->ia.ap;
2049
2050 WARN_ON(new_ap->num_pages != 0);
2051 new_ap->num_pages = 1;
2052
2053 spin_lock(&fi->lock);
2054 old_wpa = fuse_insert_writeback(&fi->writepages, new_wpa);
2055 if (!old_wpa) {
2056 spin_unlock(&fi->lock);
2057 return true;
2058 }
2059
2060 for (tmp = old_wpa->next; tmp; tmp = tmp->next) {
2061 pgoff_t curr_index;
2062
2063 WARN_ON(tmp->inode != new_wpa->inode);
2064 curr_index = tmp->ia.write.in.offset >> PAGE_SHIFT;
2065 if (curr_index == page->index) {
2066 WARN_ON(tmp->ia.ap.num_pages != 1);
2067 swap(tmp->ia.ap.pages[0], new_ap->pages[0]);
2068 break;
2069 }
2070 }
2071
2072 if (!tmp) {
2073 new_wpa->next = old_wpa->next;
2074 old_wpa->next = new_wpa;
2075 }
2076
2077 spin_unlock(&fi->lock);
2078
2079 if (tmp) {
2080 struct backing_dev_info *bdi = inode_to_bdi(new_wpa->inode);
2081
2082 dec_wb_stat(&bdi->wb, WB_WRITEBACK);
2083 dec_node_page_state(new_ap->pages[0], NR_WRITEBACK_TEMP);
2084 wb_writeout_inc(&bdi->wb);
2085 fuse_writepage_free(new_wpa);
2086 }
2087
2088 return false;
2089}
2090
2091static bool fuse_writepage_need_send(struct fuse_conn *fc, struct page *page,
2092 struct fuse_args_pages *ap,
2093 struct fuse_fill_wb_data *data)
2094{
2095 WARN_ON(!ap->num_pages);
2096
2097
2098
2099
2100
2101
2102
2103 if (fuse_page_is_writeback(data->inode, page->index))
2104 return true;
2105
2106
2107 if (ap->num_pages == fc->max_pages)
2108 return true;
2109
2110
2111 if ((ap->num_pages + 1) * PAGE_SIZE > fc->max_write)
2112 return true;
2113
2114
2115 if (data->orig_pages[ap->num_pages - 1]->index + 1 != page->index)
2116 return true;
2117
2118
2119 if (ap->num_pages == data->max_pages && !fuse_pages_realloc(data))
2120 return true;
2121
2122 return false;
2123}
2124
2125static int fuse_writepages_fill(struct page *page,
2126 struct writeback_control *wbc, void *_data)
2127{
2128 struct fuse_fill_wb_data *data = _data;
2129 struct fuse_writepage_args *wpa = data->wpa;
2130 struct fuse_args_pages *ap = &wpa->ia.ap;
2131 struct inode *inode = data->inode;
2132 struct fuse_inode *fi = get_fuse_inode(inode);
2133 struct fuse_conn *fc = get_fuse_conn(inode);
2134 struct page *tmp_page;
2135 int err;
2136
2137 if (!data->ff) {
2138 err = -EIO;
2139 data->ff = fuse_write_file_get(fi);
2140 if (!data->ff)
2141 goto out_unlock;
2142 }
2143
2144 if (wpa && fuse_writepage_need_send(fc, page, ap, data)) {
2145 fuse_writepages_send(data);
2146 data->wpa = NULL;
2147 }
2148
2149 err = -ENOMEM;
2150 tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
2151 if (!tmp_page)
2152 goto out_unlock;
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167 if (data->wpa == NULL) {
2168 err = -ENOMEM;
2169 wpa = fuse_writepage_args_alloc();
2170 if (!wpa) {
2171 __free_page(tmp_page);
2172 goto out_unlock;
2173 }
2174 fuse_writepage_add_to_bucket(fc, wpa);
2175
2176 data->max_pages = 1;
2177
2178 ap = &wpa->ia.ap;
2179 fuse_write_args_fill(&wpa->ia, data->ff, page_offset(page), 0);
2180 wpa->ia.write.in.write_flags |= FUSE_WRITE_CACHE;
2181 wpa->next = NULL;
2182 ap->args.in_pages = true;
2183 ap->args.end = fuse_writepage_end;
2184 ap->num_pages = 0;
2185 wpa->inode = inode;
2186 }
2187 set_page_writeback(page);
2188
2189 copy_highpage(tmp_page, page);
2190 ap->pages[ap->num_pages] = tmp_page;
2191 ap->descs[ap->num_pages].offset = 0;
2192 ap->descs[ap->num_pages].length = PAGE_SIZE;
2193 data->orig_pages[ap->num_pages] = page;
2194
2195 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
2196 inc_node_page_state(tmp_page, NR_WRITEBACK_TEMP);
2197
2198 err = 0;
2199 if (data->wpa) {
2200
2201
2202
2203
2204 spin_lock(&fi->lock);
2205 ap->num_pages++;
2206 spin_unlock(&fi->lock);
2207 } else if (fuse_writepage_add(wpa, page)) {
2208 data->wpa = wpa;
2209 } else {
2210 end_page_writeback(page);
2211 }
2212out_unlock:
2213 unlock_page(page);
2214
2215 return err;
2216}
2217
2218static int fuse_writepages(struct address_space *mapping,
2219 struct writeback_control *wbc)
2220{
2221 struct inode *inode = mapping->host;
2222 struct fuse_conn *fc = get_fuse_conn(inode);
2223 struct fuse_fill_wb_data data;
2224 int err;
2225
2226 err = -EIO;
2227 if (fuse_is_bad(inode))
2228 goto out;
2229
2230 data.inode = inode;
2231 data.wpa = NULL;
2232 data.ff = NULL;
2233
2234 err = -ENOMEM;
2235 data.orig_pages = kcalloc(fc->max_pages,
2236 sizeof(struct page *),
2237 GFP_NOFS);
2238 if (!data.orig_pages)
2239 goto out;
2240
2241 err = write_cache_pages(mapping, wbc, fuse_writepages_fill, &data);
2242 if (data.wpa) {
2243 WARN_ON(!data.wpa->ia.ap.num_pages);
2244 fuse_writepages_send(&data);
2245 }
2246 if (data.ff)
2247 fuse_file_put(data.ff, false, false);
2248
2249 kfree(data.orig_pages);
2250out:
2251 return err;
2252}
2253
2254
2255
2256
2257
2258static int fuse_write_begin(struct file *file, struct address_space *mapping,
2259 loff_t pos, unsigned len, unsigned flags,
2260 struct page **pagep, void **fsdata)
2261{
2262 pgoff_t index = pos >> PAGE_SHIFT;
2263 struct fuse_conn *fc = get_fuse_conn(file_inode(file));
2264 struct page *page;
2265 loff_t fsize;
2266 int err = -ENOMEM;
2267
2268 WARN_ON(!fc->writeback_cache);
2269
2270 page = grab_cache_page_write_begin(mapping, index, flags);
2271 if (!page)
2272 goto error;
2273
2274 fuse_wait_on_page_writeback(mapping->host, page->index);
2275
2276 if (PageUptodate(page) || len == PAGE_SIZE)
2277 goto success;
2278
2279
2280
2281
2282 fsize = i_size_read(mapping->host);
2283 if (fsize <= (pos & PAGE_MASK)) {
2284 size_t off = pos & ~PAGE_MASK;
2285 if (off)
2286 zero_user_segment(page, 0, off);
2287 goto success;
2288 }
2289 err = fuse_do_readpage(file, page);
2290 if (err)
2291 goto cleanup;
2292success:
2293 *pagep = page;
2294 return 0;
2295
2296cleanup:
2297 unlock_page(page);
2298 put_page(page);
2299error:
2300 return err;
2301}
2302
2303static int fuse_write_end(struct file *file, struct address_space *mapping,
2304 loff_t pos, unsigned len, unsigned copied,
2305 struct page *page, void *fsdata)
2306{
2307 struct inode *inode = page->mapping->host;
2308
2309
2310 if (!copied)
2311 goto unlock;
2312
2313 pos += copied;
2314 if (!PageUptodate(page)) {
2315
2316 size_t endoff = pos & ~PAGE_MASK;
2317 if (endoff)
2318 zero_user_segment(page, endoff, PAGE_SIZE);
2319 SetPageUptodate(page);
2320 }
2321
2322 if (pos > inode->i_size)
2323 i_size_write(inode, pos);
2324
2325 set_page_dirty(page);
2326
2327unlock:
2328 unlock_page(page);
2329 put_page(page);
2330
2331 return copied;
2332}
2333
2334static int fuse_launder_page(struct page *page)
2335{
2336 int err = 0;
2337 if (clear_page_dirty_for_io(page)) {
2338 struct inode *inode = page->mapping->host;
2339
2340
2341 fuse_wait_on_page_writeback(inode, page->index);
2342 err = fuse_writepage_locked(page);
2343 if (!err)
2344 fuse_wait_on_page_writeback(inode, page->index);
2345 }
2346 return err;
2347}
2348
2349
2350
2351
2352
2353static void fuse_vma_close(struct vm_area_struct *vma)
2354{
2355 int err;
2356
2357 err = write_inode_now(vma->vm_file->f_mapping->host, 1);
2358 mapping_set_error(vma->vm_file->f_mapping, err);
2359}
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376static vm_fault_t fuse_page_mkwrite(struct vm_fault *vmf)
2377{
2378 struct page *page = vmf->page;
2379 struct inode *inode = file_inode(vmf->vma->vm_file);
2380
2381 file_update_time(vmf->vma->vm_file);
2382 lock_page(page);
2383 if (page->mapping != inode->i_mapping) {
2384 unlock_page(page);
2385 return VM_FAULT_NOPAGE;
2386 }
2387
2388 fuse_wait_on_page_writeback(inode, page->index);
2389 return VM_FAULT_LOCKED;
2390}
2391
2392static const struct vm_operations_struct fuse_file_vm_ops = {
2393 .close = fuse_vma_close,
2394 .fault = filemap_fault,
2395 .map_pages = filemap_map_pages,
2396 .page_mkwrite = fuse_page_mkwrite,
2397};
2398
2399static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
2400{
2401 struct fuse_file *ff = file->private_data;
2402
2403
2404 if (FUSE_IS_DAX(file_inode(file)))
2405 return fuse_dax_mmap(file, vma);
2406
2407 if (ff->open_flags & FOPEN_DIRECT_IO) {
2408
2409 if (vma->vm_flags & VM_MAYSHARE)
2410 return -ENODEV;
2411
2412 invalidate_inode_pages2(file->f_mapping);
2413
2414 return generic_file_mmap(file, vma);
2415 }
2416
2417 if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE))
2418 fuse_link_write_file(file);
2419
2420 file_accessed(file);
2421 vma->vm_ops = &fuse_file_vm_ops;
2422 return 0;
2423}
2424
2425static int convert_fuse_file_lock(struct fuse_conn *fc,
2426 const struct fuse_file_lock *ffl,
2427 struct file_lock *fl)
2428{
2429 switch (ffl->type) {
2430 case F_UNLCK:
2431 break;
2432
2433 case F_RDLCK:
2434 case F_WRLCK:
2435 if (ffl->start > OFFSET_MAX || ffl->end > OFFSET_MAX ||
2436 ffl->end < ffl->start)
2437 return -EIO;
2438
2439 fl->fl_start = ffl->start;
2440 fl->fl_end = ffl->end;
2441
2442
2443
2444
2445
2446 rcu_read_lock();
2447 fl->fl_pid = pid_nr_ns(find_pid_ns(ffl->pid, fc->pid_ns), &init_pid_ns);
2448 rcu_read_unlock();
2449 break;
2450
2451 default:
2452 return -EIO;
2453 }
2454 fl->fl_type = ffl->type;
2455 return 0;
2456}
2457
2458static void fuse_lk_fill(struct fuse_args *args, struct file *file,
2459 const struct file_lock *fl, int opcode, pid_t pid,
2460 int flock, struct fuse_lk_in *inarg)
2461{
2462 struct inode *inode = file_inode(file);
2463 struct fuse_conn *fc = get_fuse_conn(inode);
2464 struct fuse_file *ff = file->private_data;
2465
2466 memset(inarg, 0, sizeof(*inarg));
2467 inarg->fh = ff->fh;
2468 inarg->owner = fuse_lock_owner_id(fc, fl->fl_owner);
2469 inarg->lk.start = fl->fl_start;
2470 inarg->lk.end = fl->fl_end;
2471 inarg->lk.type = fl->fl_type;
2472 inarg->lk.pid = pid;
2473 if (flock)
2474 inarg->lk_flags |= FUSE_LK_FLOCK;
2475 args->opcode = opcode;
2476 args->nodeid = get_node_id(inode);
2477 args->in_numargs = 1;
2478 args->in_args[0].size = sizeof(*inarg);
2479 args->in_args[0].value = inarg;
2480}
2481
2482static int fuse_getlk(struct file *file, struct file_lock *fl)
2483{
2484 struct inode *inode = file_inode(file);
2485 struct fuse_mount *fm = get_fuse_mount(inode);
2486 FUSE_ARGS(args);
2487 struct fuse_lk_in inarg;
2488 struct fuse_lk_out outarg;
2489 int err;
2490
2491 fuse_lk_fill(&args, file, fl, FUSE_GETLK, 0, 0, &inarg);
2492 args.out_numargs = 1;
2493 args.out_args[0].size = sizeof(outarg);
2494 args.out_args[0].value = &outarg;
2495 err = fuse_simple_request(fm, &args);
2496 if (!err)
2497 err = convert_fuse_file_lock(fm->fc, &outarg.lk, fl);
2498
2499 return err;
2500}
2501
2502static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
2503{
2504 struct inode *inode = file_inode(file);
2505 struct fuse_mount *fm = get_fuse_mount(inode);
2506 FUSE_ARGS(args);
2507 struct fuse_lk_in inarg;
2508 int opcode = (fl->fl_flags & FL_SLEEP) ? FUSE_SETLKW : FUSE_SETLK;
2509 struct pid *pid = fl->fl_type != F_UNLCK ? task_tgid(current) : NULL;
2510 pid_t pid_nr = pid_nr_ns(pid, fm->fc->pid_ns);
2511 int err;
2512
2513 if (fl->fl_lmops && fl->fl_lmops->lm_grant) {
2514
2515 return -ENOLCK;
2516 }
2517
2518
2519 if ((fl->fl_flags & FL_CLOSE_POSIX) == FL_CLOSE_POSIX)
2520 return 0;
2521
2522 fuse_lk_fill(&args, file, fl, opcode, pid_nr, flock, &inarg);
2523 err = fuse_simple_request(fm, &args);
2524
2525
2526 if (err == -EINTR)
2527 err = -ERESTARTSYS;
2528
2529 return err;
2530}
2531
2532static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
2533{
2534 struct inode *inode = file_inode(file);
2535 struct fuse_conn *fc = get_fuse_conn(inode);
2536 int err;
2537
2538 if (cmd == F_CANCELLK) {
2539 err = 0;
2540 } else if (cmd == F_GETLK) {
2541 if (fc->no_lock) {
2542 posix_test_lock(file, fl);
2543 err = 0;
2544 } else
2545 err = fuse_getlk(file, fl);
2546 } else {
2547 if (fc->no_lock)
2548 err = posix_lock_file(file, fl, NULL);
2549 else
2550 err = fuse_setlk(file, fl, 0);
2551 }
2552 return err;
2553}
2554
2555static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl)
2556{
2557 struct inode *inode = file_inode(file);
2558 struct fuse_conn *fc = get_fuse_conn(inode);
2559 int err;
2560
2561 if (fc->no_flock) {
2562 err = locks_lock_file_wait(file, fl);
2563 } else {
2564 struct fuse_file *ff = file->private_data;
2565
2566
2567 ff->flock = true;
2568 err = fuse_setlk(file, fl, 1);
2569 }
2570
2571 return err;
2572}
2573
2574static sector_t fuse_bmap(struct address_space *mapping, sector_t block)
2575{
2576 struct inode *inode = mapping->host;
2577 struct fuse_mount *fm = get_fuse_mount(inode);
2578 FUSE_ARGS(args);
2579 struct fuse_bmap_in inarg;
2580 struct fuse_bmap_out outarg;
2581 int err;
2582
2583 if (!inode->i_sb->s_bdev || fm->fc->no_bmap)
2584 return 0;
2585
2586 memset(&inarg, 0, sizeof(inarg));
2587 inarg.block = block;
2588 inarg.blocksize = inode->i_sb->s_blocksize;
2589 args.opcode = FUSE_BMAP;
2590 args.nodeid = get_node_id(inode);
2591 args.in_numargs = 1;
2592 args.in_args[0].size = sizeof(inarg);
2593 args.in_args[0].value = &inarg;
2594 args.out_numargs = 1;
2595 args.out_args[0].size = sizeof(outarg);
2596 args.out_args[0].value = &outarg;
2597 err = fuse_simple_request(fm, &args);
2598 if (err == -ENOSYS)
2599 fm->fc->no_bmap = 1;
2600
2601 return err ? 0 : outarg.block;
2602}
2603
2604static loff_t fuse_lseek(struct file *file, loff_t offset, int whence)
2605{
2606 struct inode *inode = file->f_mapping->host;
2607 struct fuse_mount *fm = get_fuse_mount(inode);
2608 struct fuse_file *ff = file->private_data;
2609 FUSE_ARGS(args);
2610 struct fuse_lseek_in inarg = {
2611 .fh = ff->fh,
2612 .offset = offset,
2613 .whence = whence
2614 };
2615 struct fuse_lseek_out outarg;
2616 int err;
2617
2618 if (fm->fc->no_lseek)
2619 goto fallback;
2620
2621 args.opcode = FUSE_LSEEK;
2622 args.nodeid = ff->nodeid;
2623 args.in_numargs = 1;
2624 args.in_args[0].size = sizeof(inarg);
2625 args.in_args[0].value = &inarg;
2626 args.out_numargs = 1;
2627 args.out_args[0].size = sizeof(outarg);
2628 args.out_args[0].value = &outarg;
2629 err = fuse_simple_request(fm, &args);
2630 if (err) {
2631 if (err == -ENOSYS) {
2632 fm->fc->no_lseek = 1;
2633 goto fallback;
2634 }
2635 return err;
2636 }
2637
2638 return vfs_setpos(file, outarg.offset, inode->i_sb->s_maxbytes);
2639
2640fallback:
2641 err = fuse_update_attributes(inode, file, STATX_SIZE);
2642 if (!err)
2643 return generic_file_llseek(file, offset, whence);
2644 else
2645 return err;
2646}
2647
2648static loff_t fuse_file_llseek(struct file *file, loff_t offset, int whence)
2649{
2650 loff_t retval;
2651 struct inode *inode = file_inode(file);
2652
2653 switch (whence) {
2654 case SEEK_SET:
2655 case SEEK_CUR:
2656
2657 retval = generic_file_llseek(file, offset, whence);
2658 break;
2659 case SEEK_END:
2660 inode_lock(inode);
2661 retval = fuse_update_attributes(inode, file, STATX_SIZE);
2662 if (!retval)
2663 retval = generic_file_llseek(file, offset, whence);
2664 inode_unlock(inode);
2665 break;
2666 case SEEK_HOLE:
2667 case SEEK_DATA:
2668 inode_lock(inode);
2669 retval = fuse_lseek(file, offset, whence);
2670 inode_unlock(inode);
2671 break;
2672 default:
2673 retval = -EINVAL;
2674 }
2675
2676 return retval;
2677}
2678
2679
2680
2681
2682
2683
2684static struct rb_node **fuse_find_polled_node(struct fuse_conn *fc, u64 kh,
2685 struct rb_node **parent_out)
2686{
2687 struct rb_node **link = &fc->polled_files.rb_node;
2688 struct rb_node *last = NULL;
2689
2690 while (*link) {
2691 struct fuse_file *ff;
2692
2693 last = *link;
2694 ff = rb_entry(last, struct fuse_file, polled_node);
2695
2696 if (kh < ff->kh)
2697 link = &last->rb_left;
2698 else if (kh > ff->kh)
2699 link = &last->rb_right;
2700 else
2701 return link;
2702 }
2703
2704 if (parent_out)
2705 *parent_out = last;
2706 return link;
2707}
2708
2709
2710
2711
2712
2713
2714
2715static void fuse_register_polled_file(struct fuse_conn *fc,
2716 struct fuse_file *ff)
2717{
2718 spin_lock(&fc->lock);
2719 if (RB_EMPTY_NODE(&ff->polled_node)) {
2720 struct rb_node **link, *parent;
2721
2722 link = fuse_find_polled_node(fc, ff->kh, &parent);
2723 BUG_ON(*link);
2724 rb_link_node(&ff->polled_node, parent, link);
2725 rb_insert_color(&ff->polled_node, &fc->polled_files);
2726 }
2727 spin_unlock(&fc->lock);
2728}
2729
2730__poll_t fuse_file_poll(struct file *file, poll_table *wait)
2731{
2732 struct fuse_file *ff = file->private_data;
2733 struct fuse_mount *fm = ff->fm;
2734 struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh };
2735 struct fuse_poll_out outarg;
2736 FUSE_ARGS(args);
2737 int err;
2738
2739 if (fm->fc->no_poll)
2740 return DEFAULT_POLLMASK;
2741
2742 poll_wait(file, &ff->poll_wait, wait);
2743 inarg.events = mangle_poll(poll_requested_events(wait));
2744
2745
2746
2747
2748
2749 if (waitqueue_active(&ff->poll_wait)) {
2750 inarg.flags |= FUSE_POLL_SCHEDULE_NOTIFY;
2751 fuse_register_polled_file(fm->fc, ff);
2752 }
2753
2754 args.opcode = FUSE_POLL;
2755 args.nodeid = ff->nodeid;
2756 args.in_numargs = 1;
2757 args.in_args[0].size = sizeof(inarg);
2758 args.in_args[0].value = &inarg;
2759 args.out_numargs = 1;
2760 args.out_args[0].size = sizeof(outarg);
2761 args.out_args[0].value = &outarg;
2762 err = fuse_simple_request(fm, &args);
2763
2764 if (!err)
2765 return demangle_poll(outarg.revents);
2766 if (err == -ENOSYS) {
2767 fm->fc->no_poll = 1;
2768 return DEFAULT_POLLMASK;
2769 }
2770 return EPOLLERR;
2771}
2772EXPORT_SYMBOL_GPL(fuse_file_poll);
2773
2774
2775
2776
2777
2778int fuse_notify_poll_wakeup(struct fuse_conn *fc,
2779 struct fuse_notify_poll_wakeup_out *outarg)
2780{
2781 u64 kh = outarg->kh;
2782 struct rb_node **link;
2783
2784 spin_lock(&fc->lock);
2785
2786 link = fuse_find_polled_node(fc, kh, NULL);
2787 if (*link) {
2788 struct fuse_file *ff;
2789
2790 ff = rb_entry(*link, struct fuse_file, polled_node);
2791 wake_up_interruptible_sync(&ff->poll_wait);
2792 }
2793
2794 spin_unlock(&fc->lock);
2795 return 0;
2796}
2797
2798static void fuse_do_truncate(struct file *file)
2799{
2800 struct inode *inode = file->f_mapping->host;
2801 struct iattr attr;
2802
2803 attr.ia_valid = ATTR_SIZE;
2804 attr.ia_size = i_size_read(inode);
2805
2806 attr.ia_file = file;
2807 attr.ia_valid |= ATTR_FILE;
2808
2809 fuse_do_setattr(file_dentry(file), &attr, file);
2810}
2811
2812static inline loff_t fuse_round_up(struct fuse_conn *fc, loff_t off)
2813{
2814 return round_up(off, fc->max_pages << PAGE_SHIFT);
2815}
2816
2817static ssize_t
2818fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
2819{
2820 DECLARE_COMPLETION_ONSTACK(wait);
2821 ssize_t ret = 0;
2822 struct file *file = iocb->ki_filp;
2823 struct fuse_file *ff = file->private_data;
2824 loff_t pos = 0;
2825 struct inode *inode;
2826 loff_t i_size;
2827 size_t count = iov_iter_count(iter), shortened = 0;
2828 loff_t offset = iocb->ki_pos;
2829 struct fuse_io_priv *io;
2830
2831 pos = offset;
2832 inode = file->f_mapping->host;
2833 i_size = i_size_read(inode);
2834
2835 if ((iov_iter_rw(iter) == READ) && (offset >= i_size))
2836 return 0;
2837
2838 io = kmalloc(sizeof(struct fuse_io_priv), GFP_KERNEL);
2839 if (!io)
2840 return -ENOMEM;
2841 spin_lock_init(&io->lock);
2842 kref_init(&io->refcnt);
2843 io->reqs = 1;
2844 io->bytes = -1;
2845 io->size = 0;
2846 io->offset = offset;
2847 io->write = (iov_iter_rw(iter) == WRITE);
2848 io->err = 0;
2849
2850
2851
2852
2853 io->async = ff->fm->fc->async_dio;
2854 io->iocb = iocb;
2855 io->blocking = is_sync_kiocb(iocb);
2856
2857
2858 if (io->async && !io->write && offset + count > i_size) {
2859 iov_iter_truncate(iter, fuse_round_up(ff->fm->fc, i_size - offset));
2860 shortened = count - iov_iter_count(iter);
2861 count -= shortened;
2862 }
2863
2864
2865
2866
2867
2868 if ((offset + count > i_size) && io->write)
2869 io->blocking = true;
2870
2871 if (io->async && io->blocking) {
2872
2873
2874
2875
2876 kref_get(&io->refcnt);
2877 io->done = &wait;
2878 }
2879
2880 if (iov_iter_rw(iter) == WRITE) {
2881 ret = fuse_direct_io(io, iter, &pos, FUSE_DIO_WRITE);
2882 fuse_invalidate_attr_mask(inode, FUSE_STATX_MODSIZE);
2883 } else {
2884 ret = __fuse_direct_read(io, iter, &pos);
2885 }
2886 iov_iter_reexpand(iter, iov_iter_count(iter) + shortened);
2887
2888 if (io->async) {
2889 bool blocking = io->blocking;
2890
2891 fuse_aio_complete(io, ret < 0 ? ret : 0, -1);
2892
2893
2894 if (!blocking)
2895 return -EIOCBQUEUED;
2896
2897 wait_for_completion(&wait);
2898 ret = fuse_get_res_by_io(io);
2899 }
2900
2901 kref_put(&io->refcnt, fuse_io_release);
2902
2903 if (iov_iter_rw(iter) == WRITE) {
2904 fuse_write_update_attr(inode, pos, ret);
2905 if (ret < 0 && offset + count > i_size)
2906 fuse_do_truncate(file);
2907 }
2908
2909 return ret;
2910}
2911
2912static int fuse_writeback_range(struct inode *inode, loff_t start, loff_t end)
2913{
2914 int err = filemap_write_and_wait_range(inode->i_mapping, start, LLONG_MAX);
2915
2916 if (!err)
2917 fuse_sync_writes(inode);
2918
2919 return err;
2920}
2921
2922static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
2923 loff_t length)
2924{
2925 struct fuse_file *ff = file->private_data;
2926 struct inode *inode = file_inode(file);
2927 struct fuse_inode *fi = get_fuse_inode(inode);
2928 struct fuse_mount *fm = ff->fm;
2929 FUSE_ARGS(args);
2930 struct fuse_fallocate_in inarg = {
2931 .fh = ff->fh,
2932 .offset = offset,
2933 .length = length,
2934 .mode = mode
2935 };
2936 int err;
2937 bool lock_inode = !(mode & FALLOC_FL_KEEP_SIZE) ||
2938 (mode & (FALLOC_FL_PUNCH_HOLE |
2939 FALLOC_FL_ZERO_RANGE));
2940
2941 bool block_faults = FUSE_IS_DAX(inode) && lock_inode;
2942
2943 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
2944 FALLOC_FL_ZERO_RANGE))
2945 return -EOPNOTSUPP;
2946
2947 if (fm->fc->no_fallocate)
2948 return -EOPNOTSUPP;
2949
2950 if (lock_inode) {
2951 inode_lock(inode);
2952 if (block_faults) {
2953 filemap_invalidate_lock(inode->i_mapping);
2954 err = fuse_dax_break_layouts(inode, 0, 0);
2955 if (err)
2956 goto out;
2957 }
2958
2959 if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_ZERO_RANGE)) {
2960 loff_t endbyte = offset + length - 1;
2961
2962 err = fuse_writeback_range(inode, offset, endbyte);
2963 if (err)
2964 goto out;
2965 }
2966 }
2967
2968 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
2969 offset + length > i_size_read(inode)) {
2970 err = inode_newsize_ok(inode, offset + length);
2971 if (err)
2972 goto out;
2973 }
2974
2975 if (!(mode & FALLOC_FL_KEEP_SIZE))
2976 set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
2977
2978 args.opcode = FUSE_FALLOCATE;
2979 args.nodeid = ff->nodeid;
2980 args.in_numargs = 1;
2981 args.in_args[0].size = sizeof(inarg);
2982 args.in_args[0].value = &inarg;
2983 err = fuse_simple_request(fm, &args);
2984 if (err == -ENOSYS) {
2985 fm->fc->no_fallocate = 1;
2986 err = -EOPNOTSUPP;
2987 }
2988 if (err)
2989 goto out;
2990
2991
2992 if (!(mode & FALLOC_FL_KEEP_SIZE)) {
2993 if (fuse_write_update_attr(inode, offset + length, length))
2994 file_update_time(file);
2995 }
2996
2997 if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_ZERO_RANGE))
2998 truncate_pagecache_range(inode, offset, offset + length - 1);
2999
3000 fuse_invalidate_attr_mask(inode, FUSE_STATX_MODSIZE);
3001
3002out:
3003 if (!(mode & FALLOC_FL_KEEP_SIZE))
3004 clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
3005
3006 if (block_faults)
3007 filemap_invalidate_unlock(inode->i_mapping);
3008
3009 if (lock_inode)
3010 inode_unlock(inode);
3011
3012 fuse_flush_time_update(inode);
3013
3014 return err;
3015}
3016
3017static ssize_t __fuse_copy_file_range(struct file *file_in, loff_t pos_in,
3018 struct file *file_out, loff_t pos_out,
3019 size_t len, unsigned int flags)
3020{
3021 struct fuse_file *ff_in = file_in->private_data;
3022 struct fuse_file *ff_out = file_out->private_data;
3023 struct inode *inode_in = file_inode(file_in);
3024 struct inode *inode_out = file_inode(file_out);
3025 struct fuse_inode *fi_out = get_fuse_inode(inode_out);
3026 struct fuse_mount *fm = ff_in->fm;
3027 struct fuse_conn *fc = fm->fc;
3028 FUSE_ARGS(args);
3029 struct fuse_copy_file_range_in inarg = {
3030 .fh_in = ff_in->fh,
3031 .off_in = pos_in,
3032 .nodeid_out = ff_out->nodeid,
3033 .fh_out = ff_out->fh,
3034 .off_out = pos_out,
3035 .len = len,
3036 .flags = flags
3037 };
3038 struct fuse_write_out outarg;
3039 ssize_t err;
3040
3041
3042 bool is_unstable = (!fc->writeback_cache) &&
3043 ((pos_out + len) > inode_out->i_size);
3044
3045 if (fc->no_copy_file_range)
3046 return -EOPNOTSUPP;
3047
3048 if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb)
3049 return -EXDEV;
3050
3051 inode_lock(inode_in);
3052 err = fuse_writeback_range(inode_in, pos_in, pos_in + len - 1);
3053 inode_unlock(inode_in);
3054 if (err)
3055 return err;
3056
3057 inode_lock(inode_out);
3058
3059 err = file_modified(file_out);
3060 if (err)
3061 goto out;
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081 err = fuse_writeback_range(inode_out, pos_out, pos_out + len - 1);
3082 if (err)
3083 goto out;
3084
3085 if (is_unstable)
3086 set_bit(FUSE_I_SIZE_UNSTABLE, &fi_out->state);
3087
3088 args.opcode = FUSE_COPY_FILE_RANGE;
3089 args.nodeid = ff_in->nodeid;
3090 args.in_numargs = 1;
3091 args.in_args[0].size = sizeof(inarg);
3092 args.in_args[0].value = &inarg;
3093 args.out_numargs = 1;
3094 args.out_args[0].size = sizeof(outarg);
3095 args.out_args[0].value = &outarg;
3096 err = fuse_simple_request(fm, &args);
3097 if (err == -ENOSYS) {
3098 fc->no_copy_file_range = 1;
3099 err = -EOPNOTSUPP;
3100 }
3101 if (err)
3102 goto out;
3103
3104 truncate_inode_pages_range(inode_out->i_mapping,
3105 ALIGN_DOWN(pos_out, PAGE_SIZE),
3106 ALIGN(pos_out + outarg.size, PAGE_SIZE) - 1);
3107
3108 file_update_time(file_out);
3109 fuse_write_update_attr(inode_out, pos_out + outarg.size, outarg.size);
3110
3111 err = outarg.size;
3112out:
3113 if (is_unstable)
3114 clear_bit(FUSE_I_SIZE_UNSTABLE, &fi_out->state);
3115
3116 inode_unlock(inode_out);
3117 file_accessed(file_in);
3118
3119 fuse_flush_time_update(inode_out);
3120
3121 return err;
3122}
3123
3124static ssize_t fuse_copy_file_range(struct file *src_file, loff_t src_off,
3125 struct file *dst_file, loff_t dst_off,
3126 size_t len, unsigned int flags)
3127{
3128 ssize_t ret;
3129
3130 ret = __fuse_copy_file_range(src_file, src_off, dst_file, dst_off,
3131 len, flags);
3132
3133 if (ret == -EOPNOTSUPP || ret == -EXDEV)
3134 ret = generic_copy_file_range(src_file, src_off, dst_file,
3135 dst_off, len, flags);
3136 return ret;
3137}
3138
3139static const struct file_operations fuse_file_operations = {
3140 .llseek = fuse_file_llseek,
3141 .read_iter = fuse_file_read_iter,
3142 .write_iter = fuse_file_write_iter,
3143 .mmap = fuse_file_mmap,
3144 .open = fuse_open,
3145 .flush = fuse_flush,
3146 .release = fuse_release,
3147 .fsync = fuse_fsync,
3148 .lock = fuse_file_lock,
3149 .get_unmapped_area = thp_get_unmapped_area,
3150 .flock = fuse_file_flock,
3151 .splice_read = generic_file_splice_read,
3152 .splice_write = iter_file_splice_write,
3153 .unlocked_ioctl = fuse_file_ioctl,
3154 .compat_ioctl = fuse_file_compat_ioctl,
3155 .poll = fuse_file_poll,
3156 .fallocate = fuse_file_fallocate,
3157 .copy_file_range = fuse_copy_file_range,
3158};
3159
3160static const struct address_space_operations fuse_file_aops = {
3161 .readpage = fuse_readpage,
3162 .readahead = fuse_readahead,
3163 .writepage = fuse_writepage,
3164 .writepages = fuse_writepages,
3165 .launder_page = fuse_launder_page,
3166 .set_page_dirty = __set_page_dirty_nobuffers,
3167 .bmap = fuse_bmap,
3168 .direct_IO = fuse_direct_IO,
3169 .write_begin = fuse_write_begin,
3170 .write_end = fuse_write_end,
3171};
3172
3173void fuse_init_file_inode(struct inode *inode, unsigned int flags)
3174{
3175 struct fuse_inode *fi = get_fuse_inode(inode);
3176
3177 inode->i_fop = &fuse_file_operations;
3178 inode->i_data.a_ops = &fuse_file_aops;
3179
3180 INIT_LIST_HEAD(&fi->write_files);
3181 INIT_LIST_HEAD(&fi->queued_writes);
3182 fi->writectr = 0;
3183 init_waitqueue_head(&fi->page_waitq);
3184 fi->writepages = RB_ROOT;
3185
3186 if (IS_ENABLED(CONFIG_FUSE_DAX))
3187 fuse_dax_inode_init(inode, flags);
3188}
3189