1
2
3
4
5
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_mount.h"
13#include "xfs_inode.h"
14#include "xfs_trans.h"
15#include "xfs_inode_item.h"
16#include "xfs_bmap.h"
17#include "xfs_bmap_util.h"
18#include "xfs_dir2.h"
19#include "xfs_dir2_priv.h"
20#include "xfs_ioctl.h"
21#include "xfs_trace.h"
22#include "xfs_log.h"
23#include "xfs_icache.h"
24#include "xfs_pnfs.h"
25#include "xfs_iomap.h"
26#include "xfs_reflink.h"
27
28#include <linux/falloc.h>
29#include <linux/backing-dev.h>
30#include <linux/mman.h>
31#include <linux/fadvise.h>
32#include <linux/mount.h>
33
34static const struct vm_operations_struct xfs_file_vm_ops;
35
36
37
38
39
40static bool
41xfs_is_falloc_aligned(
42 struct xfs_inode *ip,
43 loff_t pos,
44 long long int len)
45{
46 struct xfs_mount *mp = ip->i_mount;
47 uint64_t mask;
48
49 if (XFS_IS_REALTIME_INODE(ip)) {
50 if (!is_power_of_2(mp->m_sb.sb_rextsize)) {
51 u64 rextbytes;
52 u32 mod;
53
54 rextbytes = XFS_FSB_TO_B(mp, mp->m_sb.sb_rextsize);
55 div_u64_rem(pos, rextbytes, &mod);
56 if (mod)
57 return false;
58 div_u64_rem(len, rextbytes, &mod);
59 return mod == 0;
60 }
61 mask = XFS_FSB_TO_B(mp, mp->m_sb.sb_rextsize) - 1;
62 } else {
63 mask = mp->m_sb.sb_blocksize - 1;
64 }
65
66 return !((pos | len) & mask);
67}
68
69int
70xfs_update_prealloc_flags(
71 struct xfs_inode *ip,
72 enum xfs_prealloc_flags flags)
73{
74 struct xfs_trans *tp;
75 int error;
76
77 error = xfs_trans_alloc(ip->i_mount, &M_RES(ip->i_mount)->tr_writeid,
78 0, 0, 0, &tp);
79 if (error)
80 return error;
81
82 xfs_ilock(ip, XFS_ILOCK_EXCL);
83 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
84
85 if (!(flags & XFS_PREALLOC_INVISIBLE)) {
86 VFS_I(ip)->i_mode &= ~S_ISUID;
87 if (VFS_I(ip)->i_mode & S_IXGRP)
88 VFS_I(ip)->i_mode &= ~S_ISGID;
89 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
90 }
91
92 if (flags & XFS_PREALLOC_SET)
93 ip->i_diflags |= XFS_DIFLAG_PREALLOC;
94 if (flags & XFS_PREALLOC_CLEAR)
95 ip->i_diflags &= ~XFS_DIFLAG_PREALLOC;
96
97 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
98 if (flags & XFS_PREALLOC_SYNC)
99 xfs_trans_set_sync(tp);
100 return xfs_trans_commit(tp);
101}
102
103
104
105
106
107
108
109STATIC int
110xfs_dir_fsync(
111 struct file *file,
112 loff_t start,
113 loff_t end,
114 int datasync)
115{
116 struct xfs_inode *ip = XFS_I(file->f_mapping->host);
117
118 trace_xfs_dir_fsync(ip);
119 return xfs_log_force_inode(ip);
120}
121
122static xfs_csn_t
123xfs_fsync_seq(
124 struct xfs_inode *ip,
125 bool datasync)
126{
127 if (!xfs_ipincount(ip))
128 return 0;
129 if (datasync && !(ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP))
130 return 0;
131 return ip->i_itemp->ili_commit_seq;
132}
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147static int
148xfs_fsync_flush_log(
149 struct xfs_inode *ip,
150 bool datasync,
151 int *log_flushed)
152{
153 int error = 0;
154 xfs_csn_t seq;
155
156 xfs_ilock(ip, XFS_ILOCK_SHARED);
157 seq = xfs_fsync_seq(ip, datasync);
158 if (seq) {
159 error = xfs_log_force_seq(ip->i_mount, seq, XFS_LOG_SYNC,
160 log_flushed);
161
162 spin_lock(&ip->i_itemp->ili_lock);
163 ip->i_itemp->ili_fsync_fields = 0;
164 spin_unlock(&ip->i_itemp->ili_lock);
165 }
166 xfs_iunlock(ip, XFS_ILOCK_SHARED);
167 return error;
168}
169
170STATIC int
171xfs_file_fsync(
172 struct file *file,
173 loff_t start,
174 loff_t end,
175 int datasync)
176{
177 struct xfs_inode *ip = XFS_I(file->f_mapping->host);
178 struct xfs_mount *mp = ip->i_mount;
179 int error = 0;
180 int log_flushed = 0;
181
182 trace_xfs_file_fsync(ip);
183
184 error = file_write_and_wait_range(file, start, end);
185 if (error)
186 return error;
187
188 if (xfs_is_shutdown(mp))
189 return -EIO;
190
191 xfs_iflags_clear(ip, XFS_ITRUNCATED);
192
193
194
195
196
197
198
199 if (XFS_IS_REALTIME_INODE(ip))
200 blkdev_issue_flush(mp->m_rtdev_targp->bt_bdev);
201 else if (mp->m_logdev_targp != mp->m_ddev_targp)
202 blkdev_issue_flush(mp->m_ddev_targp->bt_bdev);
203
204
205
206
207
208
209
210 if (xfs_ipincount(ip))
211 error = xfs_fsync_flush_log(ip, datasync, &log_flushed);
212
213
214
215
216
217
218
219
220 if (!log_flushed && !XFS_IS_REALTIME_INODE(ip) &&
221 mp->m_logdev_targp == mp->m_ddev_targp)
222 blkdev_issue_flush(mp->m_ddev_targp->bt_bdev);
223
224 return error;
225}
226
227static int
228xfs_ilock_iocb(
229 struct kiocb *iocb,
230 unsigned int lock_mode)
231{
232 struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp));
233
234 if (iocb->ki_flags & IOCB_NOWAIT) {
235 if (!xfs_ilock_nowait(ip, lock_mode))
236 return -EAGAIN;
237 } else {
238 xfs_ilock(ip, lock_mode);
239 }
240
241 return 0;
242}
243
244STATIC ssize_t
245xfs_file_dio_read(
246 struct kiocb *iocb,
247 struct iov_iter *to)
248{
249 struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp));
250 ssize_t ret;
251
252 trace_xfs_file_direct_read(iocb, to);
253
254 if (!iov_iter_count(to))
255 return 0;
256
257 file_accessed(iocb->ki_filp);
258
259 ret = xfs_ilock_iocb(iocb, XFS_IOLOCK_SHARED);
260 if (ret)
261 return ret;
262 ret = iomap_dio_rw(iocb, to, &xfs_read_iomap_ops, NULL, 0);
263 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
264
265 return ret;
266}
267
268static noinline ssize_t
269xfs_file_dax_read(
270 struct kiocb *iocb,
271 struct iov_iter *to)
272{
273 struct xfs_inode *ip = XFS_I(iocb->ki_filp->f_mapping->host);
274 ssize_t ret = 0;
275
276 trace_xfs_file_dax_read(iocb, to);
277
278 if (!iov_iter_count(to))
279 return 0;
280
281 ret = xfs_ilock_iocb(iocb, XFS_IOLOCK_SHARED);
282 if (ret)
283 return ret;
284 ret = dax_iomap_rw(iocb, to, &xfs_read_iomap_ops);
285 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
286
287 file_accessed(iocb->ki_filp);
288 return ret;
289}
290
291STATIC ssize_t
292xfs_file_buffered_read(
293 struct kiocb *iocb,
294 struct iov_iter *to)
295{
296 struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp));
297 ssize_t ret;
298
299 trace_xfs_file_buffered_read(iocb, to);
300
301 ret = xfs_ilock_iocb(iocb, XFS_IOLOCK_SHARED);
302 if (ret)
303 return ret;
304 ret = generic_file_read_iter(iocb, to);
305 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
306
307 return ret;
308}
309
310STATIC ssize_t
311xfs_file_read_iter(
312 struct kiocb *iocb,
313 struct iov_iter *to)
314{
315 struct inode *inode = file_inode(iocb->ki_filp);
316 struct xfs_mount *mp = XFS_I(inode)->i_mount;
317 ssize_t ret = 0;
318
319 XFS_STATS_INC(mp, xs_read_calls);
320
321 if (xfs_is_shutdown(mp))
322 return -EIO;
323
324 if (IS_DAX(inode))
325 ret = xfs_file_dax_read(iocb, to);
326 else if (iocb->ki_flags & IOCB_DIRECT)
327 ret = xfs_file_dio_read(iocb, to);
328 else
329 ret = xfs_file_buffered_read(iocb, to);
330
331 if (ret > 0)
332 XFS_STATS_ADD(mp, xs_read_bytes, ret);
333 return ret;
334}
335
336
337
338
339
340
341
342
343STATIC ssize_t
344xfs_file_write_checks(
345 struct kiocb *iocb,
346 struct iov_iter *from,
347 int *iolock)
348{
349 struct file *file = iocb->ki_filp;
350 struct inode *inode = file->f_mapping->host;
351 struct xfs_inode *ip = XFS_I(inode);
352 ssize_t error = 0;
353 size_t count = iov_iter_count(from);
354 bool drained_dio = false;
355 loff_t isize;
356
357restart:
358 error = generic_write_checks(iocb, from);
359 if (error <= 0)
360 return error;
361
362 if (iocb->ki_flags & IOCB_NOWAIT) {
363 error = break_layout(inode, false);
364 if (error == -EWOULDBLOCK)
365 error = -EAGAIN;
366 } else {
367 error = xfs_break_layouts(inode, iolock, BREAK_WRITE);
368 }
369
370 if (error)
371 return error;
372
373
374
375
376
377 if (*iolock == XFS_IOLOCK_SHARED && !IS_NOSEC(inode)) {
378 xfs_iunlock(ip, *iolock);
379 *iolock = XFS_IOLOCK_EXCL;
380 error = xfs_ilock_iocb(iocb, *iolock);
381 if (error) {
382 *iolock = 0;
383 return error;
384 }
385 goto restart;
386 }
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408 if (iocb->ki_pos <= i_size_read(inode))
409 goto out;
410
411 spin_lock(&ip->i_flags_lock);
412 isize = i_size_read(inode);
413 if (iocb->ki_pos > isize) {
414 spin_unlock(&ip->i_flags_lock);
415
416 if (iocb->ki_flags & IOCB_NOWAIT)
417 return -EAGAIN;
418
419 if (!drained_dio) {
420 if (*iolock == XFS_IOLOCK_SHARED) {
421 xfs_iunlock(ip, *iolock);
422 *iolock = XFS_IOLOCK_EXCL;
423 xfs_ilock(ip, *iolock);
424 iov_iter_reexpand(from, count);
425 }
426
427
428
429
430
431
432
433
434 inode_dio_wait(inode);
435 drained_dio = true;
436 goto restart;
437 }
438
439 trace_xfs_zero_eof(ip, isize, iocb->ki_pos - isize);
440 error = iomap_zero_range(inode, isize, iocb->ki_pos - isize,
441 NULL, &xfs_buffered_write_iomap_ops);
442 if (error)
443 return error;
444 } else
445 spin_unlock(&ip->i_flags_lock);
446
447out:
448 return file_modified(file);
449}
450
451static int
452xfs_dio_write_end_io(
453 struct kiocb *iocb,
454 ssize_t size,
455 int error,
456 unsigned flags)
457{
458 struct inode *inode = file_inode(iocb->ki_filp);
459 struct xfs_inode *ip = XFS_I(inode);
460 loff_t offset = iocb->ki_pos;
461 unsigned int nofs_flag;
462
463 trace_xfs_end_io_direct_write(ip, offset, size);
464
465 if (xfs_is_shutdown(ip->i_mount))
466 return -EIO;
467
468 if (error)
469 return error;
470 if (!size)
471 return 0;
472
473
474
475
476
477 XFS_STATS_ADD(ip->i_mount, xs_write_bytes, size);
478
479
480
481
482
483
484 nofs_flag = memalloc_nofs_save();
485
486 if (flags & IOMAP_DIO_COW) {
487 error = xfs_reflink_end_cow(ip, offset, size);
488 if (error)
489 goto out;
490 }
491
492
493
494
495
496
497
498 if (flags & IOMAP_DIO_UNWRITTEN) {
499 error = xfs_iomap_write_unwritten(ip, offset, size, true);
500 goto out;
501 }
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521 if (offset + size <= i_size_read(inode))
522 goto out;
523
524 spin_lock(&ip->i_flags_lock);
525 if (offset + size > i_size_read(inode)) {
526 i_size_write(inode, offset + size);
527 spin_unlock(&ip->i_flags_lock);
528 error = xfs_setfilesize(ip, offset, size);
529 } else {
530 spin_unlock(&ip->i_flags_lock);
531 }
532
533out:
534 memalloc_nofs_restore(nofs_flag);
535 return error;
536}
537
538static const struct iomap_dio_ops xfs_dio_write_ops = {
539 .end_io = xfs_dio_write_end_io,
540};
541
542
543
544
545static noinline ssize_t
546xfs_file_dio_write_aligned(
547 struct xfs_inode *ip,
548 struct kiocb *iocb,
549 struct iov_iter *from)
550{
551 int iolock = XFS_IOLOCK_SHARED;
552 ssize_t ret;
553
554 ret = xfs_ilock_iocb(iocb, iolock);
555 if (ret)
556 return ret;
557 ret = xfs_file_write_checks(iocb, from, &iolock);
558 if (ret)
559 goto out_unlock;
560
561
562
563
564
565
566 if (iolock == XFS_IOLOCK_EXCL) {
567 xfs_ilock_demote(ip, XFS_IOLOCK_EXCL);
568 iolock = XFS_IOLOCK_SHARED;
569 }
570 trace_xfs_file_direct_write(iocb, from);
571 ret = iomap_dio_rw(iocb, from, &xfs_direct_write_iomap_ops,
572 &xfs_dio_write_ops, 0);
573out_unlock:
574 if (iolock)
575 xfs_iunlock(ip, iolock);
576 return ret;
577}
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596static noinline ssize_t
597xfs_file_dio_write_unaligned(
598 struct xfs_inode *ip,
599 struct kiocb *iocb,
600 struct iov_iter *from)
601{
602 size_t isize = i_size_read(VFS_I(ip));
603 size_t count = iov_iter_count(from);
604 int iolock = XFS_IOLOCK_SHARED;
605 unsigned int flags = IOMAP_DIO_OVERWRITE_ONLY;
606 ssize_t ret;
607
608
609
610
611
612
613 if (iocb->ki_pos > isize || iocb->ki_pos + count >= isize) {
614retry_exclusive:
615 if (iocb->ki_flags & IOCB_NOWAIT)
616 return -EAGAIN;
617 iolock = XFS_IOLOCK_EXCL;
618 flags = IOMAP_DIO_FORCE_WAIT;
619 }
620
621 ret = xfs_ilock_iocb(iocb, iolock);
622 if (ret)
623 return ret;
624
625
626
627
628
629 if (xfs_is_cow_inode(ip)) {
630 trace_xfs_reflink_bounce_dio_write(iocb, from);
631 ret = -ENOTBLK;
632 goto out_unlock;
633 }
634
635 ret = xfs_file_write_checks(iocb, from, &iolock);
636 if (ret)
637 goto out_unlock;
638
639
640
641
642
643
644
645 if (flags & IOMAP_DIO_FORCE_WAIT)
646 inode_dio_wait(VFS_I(ip));
647
648 trace_xfs_file_direct_write(iocb, from);
649 ret = iomap_dio_rw(iocb, from, &xfs_direct_write_iomap_ops,
650 &xfs_dio_write_ops, flags);
651
652
653
654
655
656
657 if (ret == -EAGAIN && !(iocb->ki_flags & IOCB_NOWAIT)) {
658 ASSERT(flags & IOMAP_DIO_OVERWRITE_ONLY);
659 xfs_iunlock(ip, iolock);
660 goto retry_exclusive;
661 }
662
663out_unlock:
664 if (iolock)
665 xfs_iunlock(ip, iolock);
666 return ret;
667}
668
669static ssize_t
670xfs_file_dio_write(
671 struct kiocb *iocb,
672 struct iov_iter *from)
673{
674 struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp));
675 struct xfs_buftarg *target = xfs_inode_buftarg(ip);
676 size_t count = iov_iter_count(from);
677
678
679 if ((iocb->ki_pos | count) & target->bt_logical_sectormask)
680 return -EINVAL;
681 if ((iocb->ki_pos | count) & ip->i_mount->m_blockmask)
682 return xfs_file_dio_write_unaligned(ip, iocb, from);
683 return xfs_file_dio_write_aligned(ip, iocb, from);
684}
685
686static noinline ssize_t
687xfs_file_dax_write(
688 struct kiocb *iocb,
689 struct iov_iter *from)
690{
691 struct inode *inode = iocb->ki_filp->f_mapping->host;
692 struct xfs_inode *ip = XFS_I(inode);
693 int iolock = XFS_IOLOCK_EXCL;
694 ssize_t ret, error = 0;
695 loff_t pos;
696
697 ret = xfs_ilock_iocb(iocb, iolock);
698 if (ret)
699 return ret;
700 ret = xfs_file_write_checks(iocb, from, &iolock);
701 if (ret)
702 goto out;
703
704 pos = iocb->ki_pos;
705
706 trace_xfs_file_dax_write(iocb, from);
707 ret = dax_iomap_rw(iocb, from, &xfs_direct_write_iomap_ops);
708 if (ret > 0 && iocb->ki_pos > i_size_read(inode)) {
709 i_size_write(inode, iocb->ki_pos);
710 error = xfs_setfilesize(ip, pos, ret);
711 }
712out:
713 if (iolock)
714 xfs_iunlock(ip, iolock);
715 if (error)
716 return error;
717
718 if (ret > 0) {
719 XFS_STATS_ADD(ip->i_mount, xs_write_bytes, ret);
720
721
722 ret = generic_write_sync(iocb, ret);
723 }
724 return ret;
725}
726
727STATIC ssize_t
728xfs_file_buffered_write(
729 struct kiocb *iocb,
730 struct iov_iter *from)
731{
732 struct file *file = iocb->ki_filp;
733 struct address_space *mapping = file->f_mapping;
734 struct inode *inode = mapping->host;
735 struct xfs_inode *ip = XFS_I(inode);
736 ssize_t ret;
737 bool cleared_space = false;
738 int iolock;
739
740 if (iocb->ki_flags & IOCB_NOWAIT)
741 return -EOPNOTSUPP;
742
743write_retry:
744 iolock = XFS_IOLOCK_EXCL;
745 xfs_ilock(ip, iolock);
746
747 ret = xfs_file_write_checks(iocb, from, &iolock);
748 if (ret)
749 goto out;
750
751
752 current->backing_dev_info = inode_to_bdi(inode);
753
754 trace_xfs_file_buffered_write(iocb, from);
755 ret = iomap_file_buffered_write(iocb, from,
756 &xfs_buffered_write_iomap_ops);
757 if (likely(ret >= 0))
758 iocb->ki_pos += ret;
759
760
761
762
763
764
765
766
767
768
769
770 if (ret == -EDQUOT && !cleared_space) {
771 xfs_iunlock(ip, iolock);
772 xfs_blockgc_free_quota(ip, XFS_ICWALK_FLAG_SYNC);
773 cleared_space = true;
774 goto write_retry;
775 } else if (ret == -ENOSPC && !cleared_space) {
776 struct xfs_icwalk icw = {0};
777
778 cleared_space = true;
779 xfs_flush_inodes(ip->i_mount);
780
781 xfs_iunlock(ip, iolock);
782 icw.icw_flags = XFS_ICWALK_FLAG_SYNC;
783 xfs_blockgc_free_space(ip->i_mount, &icw);
784 goto write_retry;
785 }
786
787 current->backing_dev_info = NULL;
788out:
789 if (iolock)
790 xfs_iunlock(ip, iolock);
791
792 if (ret > 0) {
793 XFS_STATS_ADD(ip->i_mount, xs_write_bytes, ret);
794
795 ret = generic_write_sync(iocb, ret);
796 }
797 return ret;
798}
799
800STATIC ssize_t
801xfs_file_write_iter(
802 struct kiocb *iocb,
803 struct iov_iter *from)
804{
805 struct file *file = iocb->ki_filp;
806 struct address_space *mapping = file->f_mapping;
807 struct inode *inode = mapping->host;
808 struct xfs_inode *ip = XFS_I(inode);
809 ssize_t ret;
810 size_t ocount = iov_iter_count(from);
811
812 XFS_STATS_INC(ip->i_mount, xs_write_calls);
813
814 if (ocount == 0)
815 return 0;
816
817 if (xfs_is_shutdown(ip->i_mount))
818 return -EIO;
819
820 if (IS_DAX(inode))
821 return xfs_file_dax_write(iocb, from);
822
823 if (iocb->ki_flags & IOCB_DIRECT) {
824
825
826
827
828
829
830 ret = xfs_file_dio_write(iocb, from);
831 if (ret != -ENOTBLK)
832 return ret;
833 }
834
835 return xfs_file_buffered_write(iocb, from);
836}
837
838static void
839xfs_wait_dax_page(
840 struct inode *inode)
841{
842 struct xfs_inode *ip = XFS_I(inode);
843
844 xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
845 schedule();
846 xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
847}
848
849static int
850xfs_break_dax_layouts(
851 struct inode *inode,
852 bool *retry)
853{
854 struct page *page;
855
856 ASSERT(xfs_isilocked(XFS_I(inode), XFS_MMAPLOCK_EXCL));
857
858 page = dax_layout_busy_page(inode->i_mapping);
859 if (!page)
860 return 0;
861
862 *retry = true;
863 return ___wait_var_event(&page->_refcount,
864 atomic_read(&page->_refcount) == 1, TASK_INTERRUPTIBLE,
865 0, 0, xfs_wait_dax_page(inode));
866}
867
868int
869xfs_break_layouts(
870 struct inode *inode,
871 uint *iolock,
872 enum layout_break_reason reason)
873{
874 bool retry;
875 int error;
876
877 ASSERT(xfs_isilocked(XFS_I(inode), XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL));
878
879 do {
880 retry = false;
881 switch (reason) {
882 case BREAK_UNMAP:
883 error = xfs_break_dax_layouts(inode, &retry);
884 if (error || retry)
885 break;
886 fallthrough;
887 case BREAK_WRITE:
888 error = xfs_break_leased_layouts(inode, iolock, &retry);
889 break;
890 default:
891 WARN_ON_ONCE(1);
892 error = -EINVAL;
893 }
894 } while (error == 0 && retry);
895
896 return error;
897}
898
899#define XFS_FALLOC_FL_SUPPORTED \
900 (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \
901 FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE | \
902 FALLOC_FL_INSERT_RANGE | FALLOC_FL_UNSHARE_RANGE)
903
904STATIC long
905xfs_file_fallocate(
906 struct file *file,
907 int mode,
908 loff_t offset,
909 loff_t len)
910{
911 struct inode *inode = file_inode(file);
912 struct xfs_inode *ip = XFS_I(inode);
913 long error;
914 enum xfs_prealloc_flags flags = 0;
915 uint iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
916 loff_t new_size = 0;
917 bool do_file_insert = false;
918
919 if (!S_ISREG(inode->i_mode))
920 return -EINVAL;
921 if (mode & ~XFS_FALLOC_FL_SUPPORTED)
922 return -EOPNOTSUPP;
923
924 xfs_ilock(ip, iolock);
925 error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
926 if (error)
927 goto out_unlock;
928
929
930
931
932
933
934
935
936 inode_dio_wait(inode);
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952 if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_ZERO_RANGE |
953 FALLOC_FL_COLLAPSE_RANGE)) {
954 error = xfs_flush_unmap_range(ip, offset, len);
955 if (error)
956 goto out_unlock;
957 }
958
959 if (mode & FALLOC_FL_PUNCH_HOLE) {
960 error = xfs_free_file_space(ip, offset, len);
961 if (error)
962 goto out_unlock;
963 } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
964 if (!xfs_is_falloc_aligned(ip, offset, len)) {
965 error = -EINVAL;
966 goto out_unlock;
967 }
968
969
970
971
972
973 if (offset + len >= i_size_read(inode)) {
974 error = -EINVAL;
975 goto out_unlock;
976 }
977
978 new_size = i_size_read(inode) - len;
979
980 error = xfs_collapse_file_space(ip, offset, len);
981 if (error)
982 goto out_unlock;
983 } else if (mode & FALLOC_FL_INSERT_RANGE) {
984 loff_t isize = i_size_read(inode);
985
986 if (!xfs_is_falloc_aligned(ip, offset, len)) {
987 error = -EINVAL;
988 goto out_unlock;
989 }
990
991
992
993
994
995 if (inode->i_sb->s_maxbytes - isize < len) {
996 error = -EFBIG;
997 goto out_unlock;
998 }
999 new_size = isize + len;
1000
1001
1002 if (offset >= isize) {
1003 error = -EINVAL;
1004 goto out_unlock;
1005 }
1006 do_file_insert = true;
1007 } else {
1008 flags |= XFS_PREALLOC_SET;
1009
1010 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
1011 offset + len > i_size_read(inode)) {
1012 new_size = offset + len;
1013 error = inode_newsize_ok(inode, new_size);
1014 if (error)
1015 goto out_unlock;
1016 }
1017
1018 if (mode & FALLOC_FL_ZERO_RANGE) {
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028 unsigned int blksize = i_blocksize(inode);
1029
1030 trace_xfs_zero_file_space(ip);
1031
1032 error = xfs_free_file_space(ip, offset, len);
1033 if (error)
1034 goto out_unlock;
1035
1036 len = round_up(offset + len, blksize) -
1037 round_down(offset, blksize);
1038 offset = round_down(offset, blksize);
1039 } else if (mode & FALLOC_FL_UNSHARE_RANGE) {
1040 error = xfs_reflink_unshare(ip, offset, len);
1041 if (error)
1042 goto out_unlock;
1043 } else {
1044
1045
1046
1047
1048 if (xfs_is_always_cow_inode(ip)) {
1049 error = -EOPNOTSUPP;
1050 goto out_unlock;
1051 }
1052 }
1053
1054 if (!xfs_is_always_cow_inode(ip)) {
1055 error = xfs_alloc_file_space(ip, offset, len,
1056 XFS_BMAPI_PREALLOC);
1057 if (error)
1058 goto out_unlock;
1059 }
1060 }
1061
1062 if (file->f_flags & O_DSYNC)
1063 flags |= XFS_PREALLOC_SYNC;
1064
1065 error = xfs_update_prealloc_flags(ip, flags);
1066 if (error)
1067 goto out_unlock;
1068
1069
1070 if (new_size) {
1071 struct iattr iattr;
1072
1073 iattr.ia_valid = ATTR_SIZE;
1074 iattr.ia_size = new_size;
1075 error = xfs_vn_setattr_size(file_mnt_user_ns(file),
1076 file_dentry(file), &iattr);
1077 if (error)
1078 goto out_unlock;
1079 }
1080
1081
1082
1083
1084
1085
1086
1087 if (do_file_insert)
1088 error = xfs_insert_file_space(ip, offset, len);
1089
1090out_unlock:
1091 xfs_iunlock(ip, iolock);
1092 return error;
1093}
1094
1095STATIC int
1096xfs_file_fadvise(
1097 struct file *file,
1098 loff_t start,
1099 loff_t end,
1100 int advice)
1101{
1102 struct xfs_inode *ip = XFS_I(file_inode(file));
1103 int ret;
1104 int lockflags = 0;
1105
1106
1107
1108
1109
1110 if (advice == POSIX_FADV_WILLNEED) {
1111 lockflags = XFS_IOLOCK_SHARED;
1112 xfs_ilock(ip, lockflags);
1113 }
1114 ret = generic_fadvise(file, start, end, advice);
1115 if (lockflags)
1116 xfs_iunlock(ip, lockflags);
1117 return ret;
1118}
1119
1120
1121static inline bool xfs_file_sync_writes(struct file *filp)
1122{
1123 struct xfs_inode *ip = XFS_I(file_inode(filp));
1124
1125 if (xfs_has_wsync(ip->i_mount))
1126 return true;
1127 if (filp->f_flags & (__O_SYNC | O_DSYNC))
1128 return true;
1129 if (IS_SYNC(file_inode(filp)))
1130 return true;
1131
1132 return false;
1133}
1134
1135STATIC loff_t
1136xfs_file_remap_range(
1137 struct file *file_in,
1138 loff_t pos_in,
1139 struct file *file_out,
1140 loff_t pos_out,
1141 loff_t len,
1142 unsigned int remap_flags)
1143{
1144 struct inode *inode_in = file_inode(file_in);
1145 struct xfs_inode *src = XFS_I(inode_in);
1146 struct inode *inode_out = file_inode(file_out);
1147 struct xfs_inode *dest = XFS_I(inode_out);
1148 struct xfs_mount *mp = src->i_mount;
1149 loff_t remapped = 0;
1150 xfs_extlen_t cowextsize;
1151 int ret;
1152
1153 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
1154 return -EINVAL;
1155
1156 if (!xfs_has_reflink(mp))
1157 return -EOPNOTSUPP;
1158
1159 if (xfs_is_shutdown(mp))
1160 return -EIO;
1161
1162
1163 ret = xfs_reflink_remap_prep(file_in, pos_in, file_out, pos_out,
1164 &len, remap_flags);
1165 if (ret || len == 0)
1166 return ret;
1167
1168 trace_xfs_reflink_remap_range(src, pos_in, len, dest, pos_out);
1169
1170 ret = xfs_reflink_remap_blocks(src, pos_in, dest, pos_out, len,
1171 &remapped);
1172 if (ret)
1173 goto out_unlock;
1174
1175
1176
1177
1178
1179
1180 cowextsize = 0;
1181 if (pos_in == 0 && len == i_size_read(inode_in) &&
1182 (src->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE) &&
1183 pos_out == 0 && len >= i_size_read(inode_out) &&
1184 !(dest->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE))
1185 cowextsize = src->i_cowextsize;
1186
1187 ret = xfs_reflink_update_dest(dest, pos_out + len, cowextsize,
1188 remap_flags);
1189 if (ret)
1190 goto out_unlock;
1191
1192 if (xfs_file_sync_writes(file_in) || xfs_file_sync_writes(file_out))
1193 xfs_log_force_inode(dest);
1194out_unlock:
1195 xfs_iunlock2_io_mmap(src, dest);
1196 if (ret)
1197 trace_xfs_reflink_remap_range_error(dest, ret, _RET_IP_);
1198 return remapped > 0 ? remapped : ret;
1199}
1200
1201STATIC int
1202xfs_file_open(
1203 struct inode *inode,
1204 struct file *file)
1205{
1206 if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
1207 return -EFBIG;
1208 if (xfs_is_shutdown(XFS_M(inode->i_sb)))
1209 return -EIO;
1210 file->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC;
1211 return 0;
1212}
1213
1214STATIC int
1215xfs_dir_open(
1216 struct inode *inode,
1217 struct file *file)
1218{
1219 struct xfs_inode *ip = XFS_I(inode);
1220 int mode;
1221 int error;
1222
1223 error = xfs_file_open(inode, file);
1224 if (error)
1225 return error;
1226
1227
1228
1229
1230
1231 mode = xfs_ilock_data_map_shared(ip);
1232 if (ip->i_df.if_nextents > 0)
1233 error = xfs_dir3_data_readahead(ip, 0, 0);
1234 xfs_iunlock(ip, mode);
1235 return error;
1236}
1237
1238STATIC int
1239xfs_file_release(
1240 struct inode *inode,
1241 struct file *filp)
1242{
1243 return xfs_release(XFS_I(inode));
1244}
1245
1246STATIC int
1247xfs_file_readdir(
1248 struct file *file,
1249 struct dir_context *ctx)
1250{
1251 struct inode *inode = file_inode(file);
1252 xfs_inode_t *ip = XFS_I(inode);
1253 size_t bufsize;
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267 bufsize = (size_t)min_t(loff_t, XFS_READDIR_BUFSIZE, ip->i_disk_size);
1268
1269 return xfs_readdir(NULL, ip, ctx, bufsize);
1270}
1271
1272STATIC loff_t
1273xfs_file_llseek(
1274 struct file *file,
1275 loff_t offset,
1276 int whence)
1277{
1278 struct inode *inode = file->f_mapping->host;
1279
1280 if (xfs_is_shutdown(XFS_I(inode)->i_mount))
1281 return -EIO;
1282
1283 switch (whence) {
1284 default:
1285 return generic_file_llseek(file, offset, whence);
1286 case SEEK_HOLE:
1287 offset = iomap_seek_hole(inode, offset, &xfs_seek_iomap_ops);
1288 break;
1289 case SEEK_DATA:
1290 offset = iomap_seek_data(inode, offset, &xfs_seek_iomap_ops);
1291 break;
1292 }
1293
1294 if (offset < 0)
1295 return offset;
1296 return vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1297}
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309static vm_fault_t
1310__xfs_filemap_fault(
1311 struct vm_fault *vmf,
1312 enum page_entry_size pe_size,
1313 bool write_fault)
1314{
1315 struct inode *inode = file_inode(vmf->vma->vm_file);
1316 struct xfs_inode *ip = XFS_I(inode);
1317 vm_fault_t ret;
1318
1319 trace_xfs_filemap_fault(ip, pe_size, write_fault);
1320
1321 if (write_fault) {
1322 sb_start_pagefault(inode->i_sb);
1323 file_update_time(vmf->vma->vm_file);
1324 }
1325
1326 if (IS_DAX(inode)) {
1327 pfn_t pfn;
1328
1329 xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
1330 ret = dax_iomap_fault(vmf, pe_size, &pfn, NULL,
1331 (write_fault && !vmf->cow_page) ?
1332 &xfs_direct_write_iomap_ops :
1333 &xfs_read_iomap_ops);
1334 if (ret & VM_FAULT_NEEDDSYNC)
1335 ret = dax_finish_sync_fault(vmf, pe_size, pfn);
1336 xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
1337 } else {
1338 if (write_fault) {
1339 xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
1340 ret = iomap_page_mkwrite(vmf,
1341 &xfs_buffered_write_iomap_ops);
1342 xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
1343 } else {
1344 ret = filemap_fault(vmf);
1345 }
1346 }
1347
1348 if (write_fault)
1349 sb_end_pagefault(inode->i_sb);
1350 return ret;
1351}
1352
1353static inline bool
1354xfs_is_write_fault(
1355 struct vm_fault *vmf)
1356{
1357 return (vmf->flags & FAULT_FLAG_WRITE) &&
1358 (vmf->vma->vm_flags & VM_SHARED);
1359}
1360
1361static vm_fault_t
1362xfs_filemap_fault(
1363 struct vm_fault *vmf)
1364{
1365
1366 return __xfs_filemap_fault(vmf, PE_SIZE_PTE,
1367 IS_DAX(file_inode(vmf->vma->vm_file)) &&
1368 xfs_is_write_fault(vmf));
1369}
1370
1371static vm_fault_t
1372xfs_filemap_huge_fault(
1373 struct vm_fault *vmf,
1374 enum page_entry_size pe_size)
1375{
1376 if (!IS_DAX(file_inode(vmf->vma->vm_file)))
1377 return VM_FAULT_FALLBACK;
1378
1379
1380 return __xfs_filemap_fault(vmf, pe_size,
1381 xfs_is_write_fault(vmf));
1382}
1383
1384static vm_fault_t
1385xfs_filemap_page_mkwrite(
1386 struct vm_fault *vmf)
1387{
1388 return __xfs_filemap_fault(vmf, PE_SIZE_PTE, true);
1389}
1390
1391
1392
1393
1394
1395
1396static vm_fault_t
1397xfs_filemap_pfn_mkwrite(
1398 struct vm_fault *vmf)
1399{
1400
1401 return __xfs_filemap_fault(vmf, PE_SIZE_PTE, true);
1402}
1403
1404static vm_fault_t
1405xfs_filemap_map_pages(
1406 struct vm_fault *vmf,
1407 pgoff_t start_pgoff,
1408 pgoff_t end_pgoff)
1409{
1410 struct inode *inode = file_inode(vmf->vma->vm_file);
1411 vm_fault_t ret;
1412
1413 xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
1414 ret = filemap_map_pages(vmf, start_pgoff, end_pgoff);
1415 xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
1416 return ret;
1417}
1418
1419static const struct vm_operations_struct xfs_file_vm_ops = {
1420 .fault = xfs_filemap_fault,
1421 .huge_fault = xfs_filemap_huge_fault,
1422 .map_pages = xfs_filemap_map_pages,
1423 .page_mkwrite = xfs_filemap_page_mkwrite,
1424 .pfn_mkwrite = xfs_filemap_pfn_mkwrite,
1425};
1426
1427STATIC int
1428xfs_file_mmap(
1429 struct file *file,
1430 struct vm_area_struct *vma)
1431{
1432 struct inode *inode = file_inode(file);
1433 struct xfs_buftarg *target = xfs_inode_buftarg(XFS_I(inode));
1434
1435
1436
1437
1438
1439 if (!daxdev_mapping_supported(vma, target->bt_daxdev))
1440 return -EOPNOTSUPP;
1441
1442 file_accessed(file);
1443 vma->vm_ops = &xfs_file_vm_ops;
1444 if (IS_DAX(inode))
1445 vma->vm_flags |= VM_HUGEPAGE;
1446 return 0;
1447}
1448
1449const struct file_operations xfs_file_operations = {
1450 .llseek = xfs_file_llseek,
1451 .read_iter = xfs_file_read_iter,
1452 .write_iter = xfs_file_write_iter,
1453 .splice_read = generic_file_splice_read,
1454 .splice_write = iter_file_splice_write,
1455 .iopoll = iomap_dio_iopoll,
1456 .unlocked_ioctl = xfs_file_ioctl,
1457#ifdef CONFIG_COMPAT
1458 .compat_ioctl = xfs_file_compat_ioctl,
1459#endif
1460 .mmap = xfs_file_mmap,
1461 .mmap_supported_flags = MAP_SYNC,
1462 .open = xfs_file_open,
1463 .release = xfs_file_release,
1464 .fsync = xfs_file_fsync,
1465 .get_unmapped_area = thp_get_unmapped_area,
1466 .fallocate = xfs_file_fallocate,
1467 .fadvise = xfs_file_fadvise,
1468 .remap_file_range = xfs_file_remap_range,
1469};
1470
1471const struct file_operations xfs_dir_file_operations = {
1472 .open = xfs_dir_open,
1473 .read = generic_read_dir,
1474 .iterate_shared = xfs_file_readdir,
1475 .llseek = generic_file_llseek,
1476 .unlocked_ioctl = xfs_file_ioctl,
1477#ifdef CONFIG_COMPAT
1478 .compat_ioctl = xfs_file_compat_ioctl,
1479#endif
1480 .fsync = xfs_dir_fsync,
1481};
1482