1
2
3
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5
6
7#include "xfs.h"
8#include "xfs_fs.h"
9#include "xfs_shared.h"
10#include "xfs_format.h"
11#include "xfs_log_format.h"
12#include "xfs_trans_resv.h"
13#include "xfs_mount.h"
14#include "xfs_inode.h"
15#include "xfs_btree.h"
16#include "xfs_bmap_btree.h"
17#include "xfs_bmap.h"
18#include "xfs_bmap_util.h"
19#include "xfs_errortag.h"
20#include "xfs_error.h"
21#include "xfs_trans.h"
22#include "xfs_trans_space.h"
23#include "xfs_inode_item.h"
24#include "xfs_iomap.h"
25#include "xfs_trace.h"
26#include "xfs_quota.h"
27#include "xfs_dquot_item.h"
28#include "xfs_dquot.h"
29#include "xfs_reflink.h"
30
31
32#define XFS_ALLOC_ALIGN(mp, off) \
33 (((off) >> mp->m_allocsize_log) << mp->m_allocsize_log)
34
35static int
36xfs_alert_fsblock_zero(
37 xfs_inode_t *ip,
38 xfs_bmbt_irec_t *imap)
39{
40 xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
41 "Access to block zero in inode %llu "
42 "start_block: %llx start_off: %llx "
43 "blkcnt: %llx extent-state: %x",
44 (unsigned long long)ip->i_ino,
45 (unsigned long long)imap->br_startblock,
46 (unsigned long long)imap->br_startoff,
47 (unsigned long long)imap->br_blockcount,
48 imap->br_state);
49 return -EFSCORRUPTED;
50}
51
52int
53xfs_bmbt_to_iomap(
54 struct xfs_inode *ip,
55 struct iomap *iomap,
56 struct xfs_bmbt_irec *imap,
57 u16 flags)
58{
59 struct xfs_mount *mp = ip->i_mount;
60 struct xfs_buftarg *target = xfs_inode_buftarg(ip);
61
62 if (unlikely(!xfs_valid_startblock(ip, imap->br_startblock)))
63 return xfs_alert_fsblock_zero(ip, imap);
64
65 if (imap->br_startblock == HOLESTARTBLOCK) {
66 iomap->addr = IOMAP_NULL_ADDR;
67 iomap->type = IOMAP_HOLE;
68 } else if (imap->br_startblock == DELAYSTARTBLOCK ||
69 isnullstartblock(imap->br_startblock)) {
70 iomap->addr = IOMAP_NULL_ADDR;
71 iomap->type = IOMAP_DELALLOC;
72 } else {
73 iomap->addr = BBTOB(xfs_fsb_to_db(ip, imap->br_startblock));
74 if (imap->br_state == XFS_EXT_UNWRITTEN)
75 iomap->type = IOMAP_UNWRITTEN;
76 else
77 iomap->type = IOMAP_MAPPED;
78 }
79 iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
80 iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
81 iomap->bdev = target->bt_bdev;
82 iomap->dax_dev = target->bt_daxdev;
83 iomap->flags = flags;
84
85 if (xfs_ipincount(ip) &&
86 (ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP))
87 iomap->flags |= IOMAP_F_DIRTY;
88 return 0;
89}
90
91static void
92xfs_hole_to_iomap(
93 struct xfs_inode *ip,
94 struct iomap *iomap,
95 xfs_fileoff_t offset_fsb,
96 xfs_fileoff_t end_fsb)
97{
98 struct xfs_buftarg *target = xfs_inode_buftarg(ip);
99
100 iomap->addr = IOMAP_NULL_ADDR;
101 iomap->type = IOMAP_HOLE;
102 iomap->offset = XFS_FSB_TO_B(ip->i_mount, offset_fsb);
103 iomap->length = XFS_FSB_TO_B(ip->i_mount, end_fsb - offset_fsb);
104 iomap->bdev = target->bt_bdev;
105 iomap->dax_dev = target->bt_daxdev;
106}
107
108static inline xfs_fileoff_t
109xfs_iomap_end_fsb(
110 struct xfs_mount *mp,
111 loff_t offset,
112 loff_t count)
113{
114 ASSERT(offset <= mp->m_super->s_maxbytes);
115 return min(XFS_B_TO_FSB(mp, offset + count),
116 XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes));
117}
118
119static xfs_extlen_t
120xfs_eof_alignment(
121 struct xfs_inode *ip)
122{
123 struct xfs_mount *mp = ip->i_mount;
124 xfs_extlen_t align = 0;
125
126 if (!XFS_IS_REALTIME_INODE(ip)) {
127
128
129
130
131
132
133
134
135 if (mp->m_swidth && xfs_has_swalloc(mp))
136 align = mp->m_swidth;
137 else if (mp->m_dalign)
138 align = mp->m_dalign;
139
140 if (align && XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, align))
141 align = 0;
142 }
143
144 return align;
145}
146
147
148
149
150
151xfs_fileoff_t
152xfs_iomap_eof_align_last_fsb(
153 struct xfs_inode *ip,
154 xfs_fileoff_t end_fsb)
155{
156 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
157 xfs_extlen_t extsz = xfs_get_extsz_hint(ip);
158 xfs_extlen_t align = xfs_eof_alignment(ip);
159 struct xfs_bmbt_irec irec;
160 struct xfs_iext_cursor icur;
161
162 ASSERT(!xfs_need_iread_extents(ifp));
163
164
165
166
167 if (extsz) {
168 if (align)
169 align = roundup_64(align, extsz);
170 else
171 align = extsz;
172 }
173
174 if (align) {
175 xfs_fileoff_t aligned_end_fsb = roundup_64(end_fsb, align);
176
177 xfs_iext_last(ifp, &icur);
178 if (!xfs_iext_get_extent(ifp, &icur, &irec) ||
179 aligned_end_fsb >= irec.br_startoff + irec.br_blockcount)
180 return aligned_end_fsb;
181 }
182
183 return end_fsb;
184}
185
186int
187xfs_iomap_write_direct(
188 struct xfs_inode *ip,
189 xfs_fileoff_t offset_fsb,
190 xfs_fileoff_t count_fsb,
191 struct xfs_bmbt_irec *imap)
192{
193 struct xfs_mount *mp = ip->i_mount;
194 struct xfs_trans *tp;
195 xfs_filblks_t resaligned;
196 int nimaps;
197 unsigned int dblocks, rblocks;
198 bool force = false;
199 int error;
200 int bmapi_flags = XFS_BMAPI_PREALLOC;
201 int nr_exts = XFS_IEXT_ADD_NOSPLIT_CNT;
202
203 ASSERT(count_fsb > 0);
204
205 resaligned = xfs_aligned_fsb_count(offset_fsb, count_fsb,
206 xfs_get_extsz_hint(ip));
207 if (unlikely(XFS_IS_REALTIME_INODE(ip))) {
208 dblocks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
209 rblocks = resaligned;
210 } else {
211 dblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
212 rblocks = 0;
213 }
214
215 error = xfs_qm_dqattach(ip);
216 if (error)
217 return error;
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232 if (IS_DAX(VFS_I(ip))) {
233 bmapi_flags = XFS_BMAPI_CONVERT | XFS_BMAPI_ZERO;
234 if (imap->br_state == XFS_EXT_UNWRITTEN) {
235 force = true;
236 nr_exts = XFS_IEXT_WRITE_UNWRITTEN_CNT;
237 dblocks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
238 }
239 }
240
241 error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_write, dblocks,
242 rblocks, force, &tp);
243 if (error)
244 return error;
245
246 error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK, nr_exts);
247 if (error)
248 goto out_trans_cancel;
249
250
251
252
253
254 nimaps = 1;
255 error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, bmapi_flags, 0,
256 imap, &nimaps);
257 if (error)
258 goto out_trans_cancel;
259
260
261
262
263 error = xfs_trans_commit(tp);
264 if (error)
265 goto out_unlock;
266
267
268
269
270 if (nimaps == 0) {
271 error = -ENOSPC;
272 goto out_unlock;
273 }
274
275 if (unlikely(!xfs_valid_startblock(ip, imap->br_startblock)))
276 error = xfs_alert_fsblock_zero(ip, imap);
277
278out_unlock:
279 xfs_iunlock(ip, XFS_ILOCK_EXCL);
280 return error;
281
282out_trans_cancel:
283 xfs_trans_cancel(tp);
284 goto out_unlock;
285}
286
287STATIC bool
288xfs_quota_need_throttle(
289 struct xfs_inode *ip,
290 xfs_dqtype_t type,
291 xfs_fsblock_t alloc_blocks)
292{
293 struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
294
295 if (!dq || !xfs_this_quota_on(ip->i_mount, type))
296 return false;
297
298
299 if (!dq->q_prealloc_hi_wmark)
300 return false;
301
302
303 if (dq->q_blk.reserved + alloc_blocks < dq->q_prealloc_lo_wmark)
304 return false;
305
306 return true;
307}
308
309STATIC void
310xfs_quota_calc_throttle(
311 struct xfs_inode *ip,
312 xfs_dqtype_t type,
313 xfs_fsblock_t *qblocks,
314 int *qshift,
315 int64_t *qfreesp)
316{
317 struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
318 int64_t freesp;
319 int shift = 0;
320
321
322 if (!dq || dq->q_blk.reserved >= dq->q_prealloc_hi_wmark) {
323 *qblocks = 0;
324 *qfreesp = 0;
325 return;
326 }
327
328 freesp = dq->q_prealloc_hi_wmark - dq->q_blk.reserved;
329 if (freesp < dq->q_low_space[XFS_QLOWSP_5_PCNT]) {
330 shift = 2;
331 if (freesp < dq->q_low_space[XFS_QLOWSP_3_PCNT])
332 shift += 2;
333 if (freesp < dq->q_low_space[XFS_QLOWSP_1_PCNT])
334 shift += 2;
335 }
336
337 if (freesp < *qfreesp)
338 *qfreesp = freesp;
339
340
341 if ((freesp >> shift) < (*qblocks >> *qshift)) {
342 *qblocks = freesp;
343 *qshift = shift;
344 }
345}
346
347
348
349
350
351
352
353STATIC xfs_fsblock_t
354xfs_iomap_prealloc_size(
355 struct xfs_inode *ip,
356 int whichfork,
357 loff_t offset,
358 loff_t count,
359 struct xfs_iext_cursor *icur)
360{
361 struct xfs_iext_cursor ncur = *icur;
362 struct xfs_bmbt_irec prev, got;
363 struct xfs_mount *mp = ip->i_mount;
364 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
365 xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
366 int64_t freesp;
367 xfs_fsblock_t qblocks;
368 xfs_fsblock_t alloc_blocks = 0;
369 xfs_extlen_t plen;
370 int shift = 0;
371 int qshift = 0;
372
373
374
375
376
377
378
379 if (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_allocsize_blocks))
380 return 0;
381
382
383
384
385
386 if (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign) ||
387 !xfs_iext_prev_extent(ifp, &ncur, &prev) ||
388 prev.br_startoff + prev.br_blockcount < offset_fsb)
389 return mp->m_allocsize_blocks;
390
391
392
393
394
395
396 plen = prev.br_blockcount;
397 while (xfs_iext_prev_extent(ifp, &ncur, &got)) {
398 if (plen > MAXEXTLEN / 2 ||
399 isnullstartblock(got.br_startblock) ||
400 got.br_startoff + got.br_blockcount != prev.br_startoff ||
401 got.br_startblock + got.br_blockcount != prev.br_startblock)
402 break;
403 plen += got.br_blockcount;
404 prev = got;
405 }
406
407
408
409
410
411
412
413
414 alloc_blocks = plen * 2;
415 if (alloc_blocks > MAXEXTLEN)
416 alloc_blocks = XFS_B_TO_FSB(mp, offset);
417 qblocks = alloc_blocks;
418
419
420
421
422
423
424
425
426 alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(MAXEXTLEN),
427 alloc_blocks);
428
429 freesp = percpu_counter_read_positive(&mp->m_fdblocks);
430 if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) {
431 shift = 2;
432 if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT])
433 shift++;
434 if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT])
435 shift++;
436 if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT])
437 shift++;
438 if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT])
439 shift++;
440 }
441
442
443
444
445
446 if (xfs_quota_need_throttle(ip, XFS_DQTYPE_USER, alloc_blocks))
447 xfs_quota_calc_throttle(ip, XFS_DQTYPE_USER, &qblocks, &qshift,
448 &freesp);
449 if (xfs_quota_need_throttle(ip, XFS_DQTYPE_GROUP, alloc_blocks))
450 xfs_quota_calc_throttle(ip, XFS_DQTYPE_GROUP, &qblocks, &qshift,
451 &freesp);
452 if (xfs_quota_need_throttle(ip, XFS_DQTYPE_PROJ, alloc_blocks))
453 xfs_quota_calc_throttle(ip, XFS_DQTYPE_PROJ, &qblocks, &qshift,
454 &freesp);
455
456
457
458
459
460
461
462
463 alloc_blocks = min(alloc_blocks, qblocks);
464 shift = max(shift, qshift);
465
466 if (shift)
467 alloc_blocks >>= shift;
468
469
470
471
472 if (alloc_blocks)
473 alloc_blocks = rounddown_pow_of_two(alloc_blocks);
474 if (alloc_blocks > MAXEXTLEN)
475 alloc_blocks = MAXEXTLEN;
476
477
478
479
480
481
482
483 while (alloc_blocks && alloc_blocks >= freesp)
484 alloc_blocks >>= 4;
485 if (alloc_blocks < mp->m_allocsize_blocks)
486 alloc_blocks = mp->m_allocsize_blocks;
487 trace_xfs_iomap_prealloc_size(ip, alloc_blocks, shift,
488 mp->m_allocsize_blocks);
489 return alloc_blocks;
490}
491
492int
493xfs_iomap_write_unwritten(
494 xfs_inode_t *ip,
495 xfs_off_t offset,
496 xfs_off_t count,
497 bool update_isize)
498{
499 xfs_mount_t *mp = ip->i_mount;
500 xfs_fileoff_t offset_fsb;
501 xfs_filblks_t count_fsb;
502 xfs_filblks_t numblks_fsb;
503 int nimaps;
504 xfs_trans_t *tp;
505 xfs_bmbt_irec_t imap;
506 struct inode *inode = VFS_I(ip);
507 xfs_fsize_t i_size;
508 uint resblks;
509 int error;
510
511 trace_xfs_unwritten_convert(ip, offset, count);
512
513 offset_fsb = XFS_B_TO_FSBT(mp, offset);
514 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
515 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
516
517
518
519
520
521
522
523
524
525
526
527 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
528
529
530 error = xfs_qm_dqattach(ip);
531 if (error)
532 return error;
533
534 do {
535
536
537
538
539
540
541
542
543
544 error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_write, resblks,
545 0, true, &tp);
546 if (error)
547 return error;
548
549 error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK,
550 XFS_IEXT_WRITE_UNWRITTEN_CNT);
551 if (error)
552 goto error_on_bmapi_transaction;
553
554
555
556
557 nimaps = 1;
558 error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
559 XFS_BMAPI_CONVERT, resblks, &imap,
560 &nimaps);
561 if (error)
562 goto error_on_bmapi_transaction;
563
564
565
566
567
568
569 i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb);
570 if (i_size > offset + count)
571 i_size = offset + count;
572 if (update_isize && i_size > i_size_read(inode))
573 i_size_write(inode, i_size);
574 i_size = xfs_new_eof(ip, i_size);
575 if (i_size) {
576 ip->i_disk_size = i_size;
577 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
578 }
579
580 error = xfs_trans_commit(tp);
581 xfs_iunlock(ip, XFS_ILOCK_EXCL);
582 if (error)
583 return error;
584
585 if (unlikely(!xfs_valid_startblock(ip, imap.br_startblock)))
586 return xfs_alert_fsblock_zero(ip, &imap);
587
588 if ((numblks_fsb = imap.br_blockcount) == 0) {
589
590
591
592
593 ASSERT(imap.br_blockcount);
594 break;
595 }
596 offset_fsb += numblks_fsb;
597 count_fsb -= numblks_fsb;
598 } while (count_fsb > 0);
599
600 return 0;
601
602error_on_bmapi_transaction:
603 xfs_trans_cancel(tp);
604 xfs_iunlock(ip, XFS_ILOCK_EXCL);
605 return error;
606}
607
608static inline bool
609imap_needs_alloc(
610 struct inode *inode,
611 unsigned flags,
612 struct xfs_bmbt_irec *imap,
613 int nimaps)
614{
615
616 if (flags & IOMAP_ZERO)
617 return false;
618 if (!nimaps ||
619 imap->br_startblock == HOLESTARTBLOCK ||
620 imap->br_startblock == DELAYSTARTBLOCK)
621 return true;
622
623 if (IS_DAX(inode) && imap->br_state == XFS_EXT_UNWRITTEN)
624 return true;
625 return false;
626}
627
628static inline bool
629imap_needs_cow(
630 struct xfs_inode *ip,
631 unsigned int flags,
632 struct xfs_bmbt_irec *imap,
633 int nimaps)
634{
635 if (!xfs_is_cow_inode(ip))
636 return false;
637
638
639 if (flags & IOMAP_ZERO) {
640 if (!nimaps ||
641 imap->br_startblock == HOLESTARTBLOCK ||
642 imap->br_state == XFS_EXT_UNWRITTEN)
643 return false;
644 }
645
646 return true;
647}
648
649static int
650xfs_ilock_for_iomap(
651 struct xfs_inode *ip,
652 unsigned flags,
653 unsigned *lockmode)
654{
655 unsigned mode = XFS_ILOCK_SHARED;
656 bool is_write = flags & (IOMAP_WRITE | IOMAP_ZERO);
657
658
659
660
661
662 if (xfs_is_cow_inode(ip) && is_write)
663 mode = XFS_ILOCK_EXCL;
664
665
666
667
668
669
670 if (xfs_need_iread_extents(&ip->i_df)) {
671 if (flags & IOMAP_NOWAIT)
672 return -EAGAIN;
673 mode = XFS_ILOCK_EXCL;
674 }
675
676relock:
677 if (flags & IOMAP_NOWAIT) {
678 if (!xfs_ilock_nowait(ip, mode))
679 return -EAGAIN;
680 } else {
681 xfs_ilock(ip, mode);
682 }
683
684
685
686
687
688
689 if (mode == XFS_ILOCK_SHARED && is_write && xfs_is_cow_inode(ip)) {
690 xfs_iunlock(ip, mode);
691 mode = XFS_ILOCK_EXCL;
692 goto relock;
693 }
694
695 *lockmode = mode;
696 return 0;
697}
698
699
700
701
702
703static bool
704imap_spans_range(
705 struct xfs_bmbt_irec *imap,
706 xfs_fileoff_t offset_fsb,
707 xfs_fileoff_t end_fsb)
708{
709 if (imap->br_startoff > offset_fsb)
710 return false;
711 if (imap->br_startoff + imap->br_blockcount < end_fsb)
712 return false;
713 return true;
714}
715
716static int
717xfs_direct_write_iomap_begin(
718 struct inode *inode,
719 loff_t offset,
720 loff_t length,
721 unsigned flags,
722 struct iomap *iomap,
723 struct iomap *srcmap)
724{
725 struct xfs_inode *ip = XFS_I(inode);
726 struct xfs_mount *mp = ip->i_mount;
727 struct xfs_bmbt_irec imap, cmap;
728 xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
729 xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, length);
730 int nimaps = 1, error = 0;
731 bool shared = false;
732 u16 iomap_flags = 0;
733 unsigned lockmode;
734
735 ASSERT(flags & (IOMAP_WRITE | IOMAP_ZERO));
736
737 if (xfs_is_shutdown(mp))
738 return -EIO;
739
740
741
742
743
744
745 if (offset + length > i_size_read(inode))
746 iomap_flags |= IOMAP_F_DIRTY;
747
748 error = xfs_ilock_for_iomap(ip, flags, &lockmode);
749 if (error)
750 return error;
751
752 error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
753 &nimaps, 0);
754 if (error)
755 goto out_unlock;
756
757 if (imap_needs_cow(ip, flags, &imap, nimaps)) {
758 error = -EAGAIN;
759 if (flags & IOMAP_NOWAIT)
760 goto out_unlock;
761
762
763 error = xfs_reflink_allocate_cow(ip, &imap, &cmap, &shared,
764 &lockmode, flags & IOMAP_DIRECT);
765 if (error)
766 goto out_unlock;
767 if (shared)
768 goto out_found_cow;
769 end_fsb = imap.br_startoff + imap.br_blockcount;
770 length = XFS_FSB_TO_B(mp, end_fsb) - offset;
771 }
772
773 if (imap_needs_alloc(inode, flags, &imap, nimaps))
774 goto allocate_blocks;
775
776
777
778
779
780
781
782 if (flags & (IOMAP_NOWAIT | IOMAP_OVERWRITE_ONLY)) {
783 error = -EAGAIN;
784 if (!imap_spans_range(&imap, offset_fsb, end_fsb))
785 goto out_unlock;
786 }
787
788
789
790
791
792
793
794 if (flags & IOMAP_OVERWRITE_ONLY) {
795 error = -EAGAIN;
796 if (imap.br_state != XFS_EXT_NORM &&
797 ((offset | length) & mp->m_blockmask))
798 goto out_unlock;
799 }
800
801 xfs_iunlock(ip, lockmode);
802 trace_xfs_iomap_found(ip, offset, length, XFS_DATA_FORK, &imap);
803 return xfs_bmbt_to_iomap(ip, iomap, &imap, iomap_flags);
804
805allocate_blocks:
806 error = -EAGAIN;
807 if (flags & (IOMAP_NOWAIT | IOMAP_OVERWRITE_ONLY))
808 goto out_unlock;
809
810
811
812
813
814
815
816
817
818
819 length = min_t(loff_t, length, 1024 * PAGE_SIZE);
820 end_fsb = xfs_iomap_end_fsb(mp, offset, length);
821
822 if (offset + length > XFS_ISIZE(ip))
823 end_fsb = xfs_iomap_eof_align_last_fsb(ip, end_fsb);
824 else if (nimaps && imap.br_startblock == HOLESTARTBLOCK)
825 end_fsb = min(end_fsb, imap.br_startoff + imap.br_blockcount);
826 xfs_iunlock(ip, lockmode);
827
828 error = xfs_iomap_write_direct(ip, offset_fsb, end_fsb - offset_fsb,
829 &imap);
830 if (error)
831 return error;
832
833 trace_xfs_iomap_alloc(ip, offset, length, XFS_DATA_FORK, &imap);
834 return xfs_bmbt_to_iomap(ip, iomap, &imap, iomap_flags | IOMAP_F_NEW);
835
836out_found_cow:
837 xfs_iunlock(ip, lockmode);
838 length = XFS_FSB_TO_B(mp, cmap.br_startoff + cmap.br_blockcount);
839 trace_xfs_iomap_found(ip, offset, length - offset, XFS_COW_FORK, &cmap);
840 if (imap.br_startblock != HOLESTARTBLOCK) {
841 error = xfs_bmbt_to_iomap(ip, srcmap, &imap, 0);
842 if (error)
843 return error;
844 }
845 return xfs_bmbt_to_iomap(ip, iomap, &cmap, IOMAP_F_SHARED);
846
847out_unlock:
848 if (lockmode)
849 xfs_iunlock(ip, lockmode);
850 return error;
851}
852
853const struct iomap_ops xfs_direct_write_iomap_ops = {
854 .iomap_begin = xfs_direct_write_iomap_begin,
855};
856
857static int
858xfs_buffered_write_iomap_begin(
859 struct inode *inode,
860 loff_t offset,
861 loff_t count,
862 unsigned flags,
863 struct iomap *iomap,
864 struct iomap *srcmap)
865{
866 struct xfs_inode *ip = XFS_I(inode);
867 struct xfs_mount *mp = ip->i_mount;
868 xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
869 xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, count);
870 struct xfs_bmbt_irec imap, cmap;
871 struct xfs_iext_cursor icur, ccur;
872 xfs_fsblock_t prealloc_blocks = 0;
873 bool eof = false, cow_eof = false, shared = false;
874 int allocfork = XFS_DATA_FORK;
875 int error = 0;
876
877 if (xfs_is_shutdown(mp))
878 return -EIO;
879
880
881 if (xfs_get_extsz_hint(ip))
882 return xfs_direct_write_iomap_begin(inode, offset, count,
883 flags, iomap, srcmap);
884
885 ASSERT(!XFS_IS_REALTIME_INODE(ip));
886
887 xfs_ilock(ip, XFS_ILOCK_EXCL);
888
889 if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(&ip->i_df)) ||
890 XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
891 error = -EFSCORRUPTED;
892 goto out_unlock;
893 }
894
895 XFS_STATS_INC(mp, xs_blk_mapw);
896
897 error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
898 if (error)
899 goto out_unlock;
900
901
902
903
904
905
906
907 eof = !xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap);
908 if (eof)
909 imap.br_startoff = end_fsb;
910
911
912 if ((flags & IOMAP_ZERO) && imap.br_startoff > offset_fsb) {
913 xfs_hole_to_iomap(ip, iomap, offset_fsb, imap.br_startoff);
914 goto out_unlock;
915 }
916
917
918
919
920
921
922
923
924
925 if (xfs_is_cow_inode(ip)) {
926 if (!ip->i_cowfp) {
927 ASSERT(!xfs_is_reflink_inode(ip));
928 xfs_ifork_init_cow(ip);
929 }
930 cow_eof = !xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb,
931 &ccur, &cmap);
932 if (!cow_eof && cmap.br_startoff <= offset_fsb) {
933 trace_xfs_reflink_cow_found(ip, &cmap);
934 goto found_cow;
935 }
936 }
937
938 if (imap.br_startoff <= offset_fsb) {
939
940
941
942
943
944 if (!xfs_is_cow_inode(ip) ||
945 ((flags & IOMAP_ZERO) && imap.br_state != XFS_EXT_NORM)) {
946 trace_xfs_iomap_found(ip, offset, count, XFS_DATA_FORK,
947 &imap);
948 goto found_imap;
949 }
950
951 xfs_trim_extent(&imap, offset_fsb, end_fsb - offset_fsb);
952
953
954 error = xfs_bmap_trim_cow(ip, &imap, &shared);
955 if (error)
956 goto out_unlock;
957
958
959 if (!shared) {
960 trace_xfs_iomap_found(ip, offset, count, XFS_DATA_FORK,
961 &imap);
962 goto found_imap;
963 }
964
965
966
967
968
969 allocfork = XFS_COW_FORK;
970 end_fsb = imap.br_startoff + imap.br_blockcount;
971 } else {
972
973
974
975
976
977
978
979
980
981 count = min_t(loff_t, count, 1024 * PAGE_SIZE);
982 end_fsb = xfs_iomap_end_fsb(mp, offset, count);
983
984 if (xfs_is_always_cow_inode(ip))
985 allocfork = XFS_COW_FORK;
986 }
987
988 error = xfs_qm_dqattach_locked(ip, false);
989 if (error)
990 goto out_unlock;
991
992 if (eof && offset + count > XFS_ISIZE(ip)) {
993
994
995
996
997 if (xfs_has_allocsize(mp))
998 prealloc_blocks = mp->m_allocsize_blocks;
999 else
1000 prealloc_blocks = xfs_iomap_prealloc_size(ip, allocfork,
1001 offset, count, &icur);
1002 if (prealloc_blocks) {
1003 xfs_extlen_t align;
1004 xfs_off_t end_offset;
1005 xfs_fileoff_t p_end_fsb;
1006
1007 end_offset = XFS_ALLOC_ALIGN(mp, offset + count - 1);
1008 p_end_fsb = XFS_B_TO_FSBT(mp, end_offset) +
1009 prealloc_blocks;
1010
1011 align = xfs_eof_alignment(ip);
1012 if (align)
1013 p_end_fsb = roundup_64(p_end_fsb, align);
1014
1015 p_end_fsb = min(p_end_fsb,
1016 XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes));
1017 ASSERT(p_end_fsb > offset_fsb);
1018 prealloc_blocks = p_end_fsb - end_fsb;
1019 }
1020 }
1021
1022retry:
1023 error = xfs_bmapi_reserve_delalloc(ip, allocfork, offset_fsb,
1024 end_fsb - offset_fsb, prealloc_blocks,
1025 allocfork == XFS_DATA_FORK ? &imap : &cmap,
1026 allocfork == XFS_DATA_FORK ? &icur : &ccur,
1027 allocfork == XFS_DATA_FORK ? eof : cow_eof);
1028 switch (error) {
1029 case 0:
1030 break;
1031 case -ENOSPC:
1032 case -EDQUOT:
1033
1034 trace_xfs_delalloc_enospc(ip, offset, count);
1035 if (prealloc_blocks) {
1036 prealloc_blocks = 0;
1037 goto retry;
1038 }
1039 fallthrough;
1040 default:
1041 goto out_unlock;
1042 }
1043
1044 if (allocfork == XFS_COW_FORK) {
1045 trace_xfs_iomap_alloc(ip, offset, count, allocfork, &cmap);
1046 goto found_cow;
1047 }
1048
1049
1050
1051
1052
1053 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1054 trace_xfs_iomap_alloc(ip, offset, count, allocfork, &imap);
1055 return xfs_bmbt_to_iomap(ip, iomap, &imap, IOMAP_F_NEW);
1056
1057found_imap:
1058 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1059 return xfs_bmbt_to_iomap(ip, iomap, &imap, 0);
1060
1061found_cow:
1062 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1063 if (imap.br_startoff <= offset_fsb) {
1064 error = xfs_bmbt_to_iomap(ip, srcmap, &imap, 0);
1065 if (error)
1066 return error;
1067 return xfs_bmbt_to_iomap(ip, iomap, &cmap, IOMAP_F_SHARED);
1068 }
1069
1070 xfs_trim_extent(&cmap, offset_fsb, imap.br_startoff - offset_fsb);
1071 return xfs_bmbt_to_iomap(ip, iomap, &cmap, 0);
1072
1073out_unlock:
1074 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1075 return error;
1076}
1077
1078static int
1079xfs_buffered_write_iomap_end(
1080 struct inode *inode,
1081 loff_t offset,
1082 loff_t length,
1083 ssize_t written,
1084 unsigned flags,
1085 struct iomap *iomap)
1086{
1087 struct xfs_inode *ip = XFS_I(inode);
1088 struct xfs_mount *mp = ip->i_mount;
1089 xfs_fileoff_t start_fsb;
1090 xfs_fileoff_t end_fsb;
1091 int error = 0;
1092
1093 if (iomap->type != IOMAP_DELALLOC)
1094 return 0;
1095
1096
1097
1098
1099
1100 if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DROP_WRITES)) {
1101 iomap->flags |= IOMAP_F_NEW;
1102 written = 0;
1103 }
1104
1105
1106
1107
1108
1109
1110 if (unlikely(!written))
1111 start_fsb = XFS_B_TO_FSBT(mp, offset);
1112 else
1113 start_fsb = XFS_B_TO_FSB(mp, offset + written);
1114 end_fsb = XFS_B_TO_FSB(mp, offset + length);
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124 if ((iomap->flags & IOMAP_F_NEW) && start_fsb < end_fsb) {
1125 truncate_pagecache_range(VFS_I(ip), XFS_FSB_TO_B(mp, start_fsb),
1126 XFS_FSB_TO_B(mp, end_fsb) - 1);
1127
1128 error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
1129 end_fsb - start_fsb);
1130 if (error && !xfs_is_shutdown(mp)) {
1131 xfs_alert(mp, "%s: unable to clean up ino %lld",
1132 __func__, ip->i_ino);
1133 return error;
1134 }
1135 }
1136
1137 return 0;
1138}
1139
1140const struct iomap_ops xfs_buffered_write_iomap_ops = {
1141 .iomap_begin = xfs_buffered_write_iomap_begin,
1142 .iomap_end = xfs_buffered_write_iomap_end,
1143};
1144
1145static int
1146xfs_read_iomap_begin(
1147 struct inode *inode,
1148 loff_t offset,
1149 loff_t length,
1150 unsigned flags,
1151 struct iomap *iomap,
1152 struct iomap *srcmap)
1153{
1154 struct xfs_inode *ip = XFS_I(inode);
1155 struct xfs_mount *mp = ip->i_mount;
1156 struct xfs_bmbt_irec imap;
1157 xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
1158 xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, length);
1159 int nimaps = 1, error = 0;
1160 bool shared = false;
1161 unsigned lockmode;
1162
1163 ASSERT(!(flags & (IOMAP_WRITE | IOMAP_ZERO)));
1164
1165 if (xfs_is_shutdown(mp))
1166 return -EIO;
1167
1168 error = xfs_ilock_for_iomap(ip, flags, &lockmode);
1169 if (error)
1170 return error;
1171 error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
1172 &nimaps, 0);
1173 if (!error && (flags & IOMAP_REPORT))
1174 error = xfs_reflink_trim_around_shared(ip, &imap, &shared);
1175 xfs_iunlock(ip, lockmode);
1176
1177 if (error)
1178 return error;
1179 trace_xfs_iomap_found(ip, offset, length, XFS_DATA_FORK, &imap);
1180 return xfs_bmbt_to_iomap(ip, iomap, &imap, shared ? IOMAP_F_SHARED : 0);
1181}
1182
1183const struct iomap_ops xfs_read_iomap_ops = {
1184 .iomap_begin = xfs_read_iomap_begin,
1185};
1186
1187static int
1188xfs_seek_iomap_begin(
1189 struct inode *inode,
1190 loff_t offset,
1191 loff_t length,
1192 unsigned flags,
1193 struct iomap *iomap,
1194 struct iomap *srcmap)
1195{
1196 struct xfs_inode *ip = XFS_I(inode);
1197 struct xfs_mount *mp = ip->i_mount;
1198 xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
1199 xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + length);
1200 xfs_fileoff_t cow_fsb = NULLFILEOFF, data_fsb = NULLFILEOFF;
1201 struct xfs_iext_cursor icur;
1202 struct xfs_bmbt_irec imap, cmap;
1203 int error = 0;
1204 unsigned lockmode;
1205
1206 if (xfs_is_shutdown(mp))
1207 return -EIO;
1208
1209 lockmode = xfs_ilock_data_map_shared(ip);
1210 error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
1211 if (error)
1212 goto out_unlock;
1213
1214 if (xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap)) {
1215
1216
1217
1218 if (imap.br_startoff <= offset_fsb)
1219 goto done;
1220 data_fsb = imap.br_startoff;
1221 } else {
1222
1223
1224
1225 data_fsb = xfs_iomap_end_fsb(mp, offset, length);
1226 }
1227
1228
1229
1230
1231
1232 if (xfs_inode_has_cow_data(ip) &&
1233 xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &cmap))
1234 cow_fsb = cmap.br_startoff;
1235 if (cow_fsb != NULLFILEOFF && cow_fsb <= offset_fsb) {
1236 if (data_fsb < cow_fsb + cmap.br_blockcount)
1237 end_fsb = min(end_fsb, data_fsb);
1238 xfs_trim_extent(&cmap, offset_fsb, end_fsb);
1239 error = xfs_bmbt_to_iomap(ip, iomap, &cmap, IOMAP_F_SHARED);
1240
1241
1242
1243
1244
1245 iomap->type = IOMAP_UNWRITTEN;
1246 goto out_unlock;
1247 }
1248
1249
1250
1251
1252 if (cow_fsb != NULLFILEOFF && cow_fsb < data_fsb)
1253 imap.br_blockcount = cow_fsb - offset_fsb;
1254 else
1255 imap.br_blockcount = data_fsb - offset_fsb;
1256 imap.br_startoff = offset_fsb;
1257 imap.br_startblock = HOLESTARTBLOCK;
1258 imap.br_state = XFS_EXT_NORM;
1259done:
1260 xfs_trim_extent(&imap, offset_fsb, end_fsb);
1261 error = xfs_bmbt_to_iomap(ip, iomap, &imap, 0);
1262out_unlock:
1263 xfs_iunlock(ip, lockmode);
1264 return error;
1265}
1266
1267const struct iomap_ops xfs_seek_iomap_ops = {
1268 .iomap_begin = xfs_seek_iomap_begin,
1269};
1270
1271static int
1272xfs_xattr_iomap_begin(
1273 struct inode *inode,
1274 loff_t offset,
1275 loff_t length,
1276 unsigned flags,
1277 struct iomap *iomap,
1278 struct iomap *srcmap)
1279{
1280 struct xfs_inode *ip = XFS_I(inode);
1281 struct xfs_mount *mp = ip->i_mount;
1282 xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
1283 xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + length);
1284 struct xfs_bmbt_irec imap;
1285 int nimaps = 1, error = 0;
1286 unsigned lockmode;
1287
1288 if (xfs_is_shutdown(mp))
1289 return -EIO;
1290
1291 lockmode = xfs_ilock_attr_map_shared(ip);
1292
1293
1294 if (!XFS_IFORK_Q(ip) || !ip->i_afp->if_nextents) {
1295 error = -ENOENT;
1296 goto out_unlock;
1297 }
1298
1299 ASSERT(ip->i_afp->if_format != XFS_DINODE_FMT_LOCAL);
1300 error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
1301 &nimaps, XFS_BMAPI_ATTRFORK);
1302out_unlock:
1303 xfs_iunlock(ip, lockmode);
1304
1305 if (error)
1306 return error;
1307 ASSERT(nimaps);
1308 return xfs_bmbt_to_iomap(ip, iomap, &imap, 0);
1309}
1310
1311const struct iomap_ops xfs_xattr_iomap_ops = {
1312 .iomap_begin = xfs_xattr_iomap_begin,
1313};
1314