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4
5
6#include "internal.h"
7#include <asm/unaligned.h>
8#include <trace/events/erofs.h>
9
10int z_erofs_fill_inode(struct inode *inode)
11{
12 struct erofs_inode *const vi = EROFS_I(inode);
13 struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
14
15 if (!erofs_sb_has_big_pcluster(sbi) &&
16 vi->datalayout == EROFS_INODE_FLAT_COMPRESSION_LEGACY) {
17 vi->z_advise = 0;
18 vi->z_algorithmtype[0] = 0;
19 vi->z_algorithmtype[1] = 0;
20 vi->z_logical_clusterbits = LOG_BLOCK_SIZE;
21 set_bit(EROFS_I_Z_INITED_BIT, &vi->flags);
22 }
23 inode->i_mapping->a_ops = &z_erofs_aops;
24 return 0;
25}
26
27static int z_erofs_fill_inode_lazy(struct inode *inode)
28{
29 struct erofs_inode *const vi = EROFS_I(inode);
30 struct super_block *const sb = inode->i_sb;
31 int err;
32 erofs_off_t pos;
33 struct page *page;
34 void *kaddr;
35 struct z_erofs_map_header *h;
36
37 if (test_bit(EROFS_I_Z_INITED_BIT, &vi->flags)) {
38
39
40
41
42 smp_mb();
43 return 0;
44 }
45
46 if (wait_on_bit_lock(&vi->flags, EROFS_I_BL_Z_BIT, TASK_KILLABLE))
47 return -ERESTARTSYS;
48
49 err = 0;
50 if (test_bit(EROFS_I_Z_INITED_BIT, &vi->flags))
51 goto out_unlock;
52
53 DBG_BUGON(!erofs_sb_has_big_pcluster(EROFS_SB(sb)) &&
54 vi->datalayout == EROFS_INODE_FLAT_COMPRESSION_LEGACY);
55
56 pos = ALIGN(iloc(EROFS_SB(sb), vi->nid) + vi->inode_isize +
57 vi->xattr_isize, 8);
58 page = erofs_get_meta_page(sb, erofs_blknr(pos));
59 if (IS_ERR(page)) {
60 err = PTR_ERR(page);
61 goto out_unlock;
62 }
63
64 kaddr = kmap_atomic(page);
65
66 h = kaddr + erofs_blkoff(pos);
67 vi->z_advise = le16_to_cpu(h->h_advise);
68 vi->z_algorithmtype[0] = h->h_algorithmtype & 15;
69 vi->z_algorithmtype[1] = h->h_algorithmtype >> 4;
70
71 if (vi->z_algorithmtype[0] >= Z_EROFS_COMPRESSION_MAX) {
72 erofs_err(sb, "unknown compression format %u for nid %llu, please upgrade kernel",
73 vi->z_algorithmtype[0], vi->nid);
74 err = -EOPNOTSUPP;
75 goto unmap_done;
76 }
77
78 vi->z_logical_clusterbits = LOG_BLOCK_SIZE + (h->h_clusterbits & 7);
79 if (!erofs_sb_has_big_pcluster(EROFS_SB(sb)) &&
80 vi->z_advise & (Z_EROFS_ADVISE_BIG_PCLUSTER_1 |
81 Z_EROFS_ADVISE_BIG_PCLUSTER_2)) {
82 erofs_err(sb, "per-inode big pcluster without sb feature for nid %llu",
83 vi->nid);
84 err = -EFSCORRUPTED;
85 goto unmap_done;
86 }
87 if (vi->datalayout == EROFS_INODE_FLAT_COMPRESSION &&
88 !(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1) ^
89 !(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_2)) {
90 erofs_err(sb, "big pcluster head1/2 of compact indexes should be consistent for nid %llu",
91 vi->nid);
92 err = -EFSCORRUPTED;
93 goto unmap_done;
94 }
95
96 smp_mb();
97 set_bit(EROFS_I_Z_INITED_BIT, &vi->flags);
98unmap_done:
99 kunmap_atomic(kaddr);
100 unlock_page(page);
101 put_page(page);
102out_unlock:
103 clear_and_wake_up_bit(EROFS_I_BL_Z_BIT, &vi->flags);
104 return err;
105}
106
107struct z_erofs_maprecorder {
108 struct inode *inode;
109 struct erofs_map_blocks *map;
110 void *kaddr;
111
112 unsigned long lcn;
113
114 u8 type;
115 u16 clusterofs;
116 u16 delta[2];
117 erofs_blk_t pblk, compressedlcs;
118};
119
120static int z_erofs_reload_indexes(struct z_erofs_maprecorder *m,
121 erofs_blk_t eblk)
122{
123 struct super_block *const sb = m->inode->i_sb;
124 struct erofs_map_blocks *const map = m->map;
125 struct page *mpage = map->mpage;
126
127 if (mpage) {
128 if (mpage->index == eblk) {
129 if (!m->kaddr)
130 m->kaddr = kmap_atomic(mpage);
131 return 0;
132 }
133
134 if (m->kaddr) {
135 kunmap_atomic(m->kaddr);
136 m->kaddr = NULL;
137 }
138 put_page(mpage);
139 }
140
141 mpage = erofs_get_meta_page(sb, eblk);
142 if (IS_ERR(mpage)) {
143 map->mpage = NULL;
144 return PTR_ERR(mpage);
145 }
146 m->kaddr = kmap_atomic(mpage);
147 unlock_page(mpage);
148 map->mpage = mpage;
149 return 0;
150}
151
152static int legacy_load_cluster_from_disk(struct z_erofs_maprecorder *m,
153 unsigned long lcn)
154{
155 struct inode *const inode = m->inode;
156 struct erofs_inode *const vi = EROFS_I(inode);
157 const erofs_off_t ibase = iloc(EROFS_I_SB(inode), vi->nid);
158 const erofs_off_t pos =
159 Z_EROFS_VLE_LEGACY_INDEX_ALIGN(ibase + vi->inode_isize +
160 vi->xattr_isize) +
161 lcn * sizeof(struct z_erofs_vle_decompressed_index);
162 struct z_erofs_vle_decompressed_index *di;
163 unsigned int advise, type;
164 int err;
165
166 err = z_erofs_reload_indexes(m, erofs_blknr(pos));
167 if (err)
168 return err;
169
170 m->lcn = lcn;
171 di = m->kaddr + erofs_blkoff(pos);
172
173 advise = le16_to_cpu(di->di_advise);
174 type = (advise >> Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT) &
175 ((1 << Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS) - 1);
176 switch (type) {
177 case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
178 m->clusterofs = 1 << vi->z_logical_clusterbits;
179 m->delta[0] = le16_to_cpu(di->di_u.delta[0]);
180 if (m->delta[0] & Z_EROFS_VLE_DI_D0_CBLKCNT) {
181 if (!(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1)) {
182 DBG_BUGON(1);
183 return -EFSCORRUPTED;
184 }
185 m->compressedlcs = m->delta[0] &
186 ~Z_EROFS_VLE_DI_D0_CBLKCNT;
187 m->delta[0] = 1;
188 }
189 m->delta[1] = le16_to_cpu(di->di_u.delta[1]);
190 break;
191 case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
192 case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
193 m->clusterofs = le16_to_cpu(di->di_clusterofs);
194 m->pblk = le32_to_cpu(di->di_u.blkaddr);
195 break;
196 default:
197 DBG_BUGON(1);
198 return -EOPNOTSUPP;
199 }
200 m->type = type;
201 return 0;
202}
203
204static unsigned int decode_compactedbits(unsigned int lobits,
205 unsigned int lomask,
206 u8 *in, unsigned int pos, u8 *type)
207{
208 const unsigned int v = get_unaligned_le32(in + pos / 8) >> (pos & 7);
209 const unsigned int lo = v & lomask;
210
211 *type = (v >> lobits) & 3;
212 return lo;
213}
214
215static int get_compacted_la_distance(unsigned int lclusterbits,
216 unsigned int encodebits,
217 unsigned int vcnt, u8 *in, int i)
218{
219 const unsigned int lomask = (1 << lclusterbits) - 1;
220 unsigned int lo, d1 = 0;
221 u8 type;
222
223 DBG_BUGON(i >= vcnt);
224
225 do {
226 lo = decode_compactedbits(lclusterbits, lomask,
227 in, encodebits * i, &type);
228
229 if (type != Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
230 return d1;
231 ++d1;
232 } while (++i < vcnt);
233
234
235 if (!(lo & Z_EROFS_VLE_DI_D0_CBLKCNT))
236 d1 += lo - 1;
237 return d1;
238}
239
240static int unpack_compacted_index(struct z_erofs_maprecorder *m,
241 unsigned int amortizedshift,
242 unsigned int eofs, bool lookahead)
243{
244 struct erofs_inode *const vi = EROFS_I(m->inode);
245 const unsigned int lclusterbits = vi->z_logical_clusterbits;
246 const unsigned int lomask = (1 << lclusterbits) - 1;
247 unsigned int vcnt, base, lo, encodebits, nblk;
248 int i;
249 u8 *in, type;
250 bool big_pcluster;
251
252 if (1 << amortizedshift == 4)
253 vcnt = 2;
254 else if (1 << amortizedshift == 2 && lclusterbits == 12)
255 vcnt = 16;
256 else
257 return -EOPNOTSUPP;
258
259 big_pcluster = vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1;
260 encodebits = ((vcnt << amortizedshift) - sizeof(__le32)) * 8 / vcnt;
261 base = round_down(eofs, vcnt << amortizedshift);
262 in = m->kaddr + base;
263
264 i = (eofs - base) >> amortizedshift;
265
266 lo = decode_compactedbits(lclusterbits, lomask,
267 in, encodebits * i, &type);
268 m->type = type;
269 if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
270 m->clusterofs = 1 << lclusterbits;
271
272
273 if (lookahead)
274 m->delta[1] = get_compacted_la_distance(lclusterbits,
275 encodebits, vcnt, in, i);
276 if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT) {
277 if (!big_pcluster) {
278 DBG_BUGON(1);
279 return -EFSCORRUPTED;
280 }
281 m->compressedlcs = lo & ~Z_EROFS_VLE_DI_D0_CBLKCNT;
282 m->delta[0] = 1;
283 return 0;
284 } else if (i + 1 != (int)vcnt) {
285 m->delta[0] = lo;
286 return 0;
287 }
288
289
290
291
292
293 lo = decode_compactedbits(lclusterbits, lomask,
294 in, encodebits * (i - 1), &type);
295 if (type != Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
296 lo = 0;
297 else if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT)
298 lo = 1;
299 m->delta[0] = lo + 1;
300 return 0;
301 }
302 m->clusterofs = lo;
303 m->delta[0] = 0;
304
305 if (!big_pcluster) {
306 nblk = 1;
307 while (i > 0) {
308 --i;
309 lo = decode_compactedbits(lclusterbits, lomask,
310 in, encodebits * i, &type);
311 if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
312 i -= lo;
313
314 if (i >= 0)
315 ++nblk;
316 }
317 } else {
318 nblk = 0;
319 while (i > 0) {
320 --i;
321 lo = decode_compactedbits(lclusterbits, lomask,
322 in, encodebits * i, &type);
323 if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
324 if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT) {
325 --i;
326 nblk += lo & ~Z_EROFS_VLE_DI_D0_CBLKCNT;
327 continue;
328 }
329
330 if (lo <= 1) {
331 DBG_BUGON(1);
332 return -EFSCORRUPTED;
333 }
334 i -= lo - 2;
335 continue;
336 }
337 ++nblk;
338 }
339 }
340 in += (vcnt << amortizedshift) - sizeof(__le32);
341 m->pblk = le32_to_cpu(*(__le32 *)in) + nblk;
342 return 0;
343}
344
345static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m,
346 unsigned long lcn, bool lookahead)
347{
348 struct inode *const inode = m->inode;
349 struct erofs_inode *const vi = EROFS_I(inode);
350 const unsigned int lclusterbits = vi->z_logical_clusterbits;
351 const erofs_off_t ebase = ALIGN(iloc(EROFS_I_SB(inode), vi->nid) +
352 vi->inode_isize + vi->xattr_isize, 8) +
353 sizeof(struct z_erofs_map_header);
354 const unsigned int totalidx = DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ);
355 unsigned int compacted_4b_initial, compacted_2b;
356 unsigned int amortizedshift;
357 erofs_off_t pos;
358 int err;
359
360 if (lclusterbits != 12)
361 return -EOPNOTSUPP;
362
363 if (lcn >= totalidx)
364 return -EINVAL;
365
366 m->lcn = lcn;
367
368 compacted_4b_initial = (32 - ebase % 32) / 4;
369 if (compacted_4b_initial == 32 / 4)
370 compacted_4b_initial = 0;
371
372 if ((vi->z_advise & Z_EROFS_ADVISE_COMPACTED_2B) &&
373 compacted_4b_initial < totalidx)
374 compacted_2b = rounddown(totalidx - compacted_4b_initial, 16);
375 else
376 compacted_2b = 0;
377
378 pos = ebase;
379 if (lcn < compacted_4b_initial) {
380 amortizedshift = 2;
381 goto out;
382 }
383 pos += compacted_4b_initial * 4;
384 lcn -= compacted_4b_initial;
385
386 if (lcn < compacted_2b) {
387 amortizedshift = 1;
388 goto out;
389 }
390 pos += compacted_2b * 2;
391 lcn -= compacted_2b;
392 amortizedshift = 2;
393out:
394 pos += lcn * (1 << amortizedshift);
395 err = z_erofs_reload_indexes(m, erofs_blknr(pos));
396 if (err)
397 return err;
398 return unpack_compacted_index(m, amortizedshift, erofs_blkoff(pos),
399 lookahead);
400}
401
402static int z_erofs_load_cluster_from_disk(struct z_erofs_maprecorder *m,
403 unsigned int lcn, bool lookahead)
404{
405 const unsigned int datamode = EROFS_I(m->inode)->datalayout;
406
407 if (datamode == EROFS_INODE_FLAT_COMPRESSION_LEGACY)
408 return legacy_load_cluster_from_disk(m, lcn);
409
410 if (datamode == EROFS_INODE_FLAT_COMPRESSION)
411 return compacted_load_cluster_from_disk(m, lcn, lookahead);
412
413 return -EINVAL;
414}
415
416static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
417 unsigned int lookback_distance)
418{
419 struct erofs_inode *const vi = EROFS_I(m->inode);
420 struct erofs_map_blocks *const map = m->map;
421 const unsigned int lclusterbits = vi->z_logical_clusterbits;
422 unsigned long lcn = m->lcn;
423 int err;
424
425 if (lcn < lookback_distance) {
426 erofs_err(m->inode->i_sb,
427 "bogus lookback distance @ nid %llu", vi->nid);
428 DBG_BUGON(1);
429 return -EFSCORRUPTED;
430 }
431
432
433 lcn -= lookback_distance;
434 err = z_erofs_load_cluster_from_disk(m, lcn, false);
435 if (err)
436 return err;
437
438 switch (m->type) {
439 case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
440 if (!m->delta[0]) {
441 erofs_err(m->inode->i_sb,
442 "invalid lookback distance 0 @ nid %llu",
443 vi->nid);
444 DBG_BUGON(1);
445 return -EFSCORRUPTED;
446 }
447 return z_erofs_extent_lookback(m, m->delta[0]);
448 case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
449 map->m_flags &= ~EROFS_MAP_ZIPPED;
450 fallthrough;
451 case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
452 map->m_la = (lcn << lclusterbits) | m->clusterofs;
453 break;
454 default:
455 erofs_err(m->inode->i_sb,
456 "unknown type %u @ lcn %lu of nid %llu",
457 m->type, lcn, vi->nid);
458 DBG_BUGON(1);
459 return -EOPNOTSUPP;
460 }
461 return 0;
462}
463
464static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
465 unsigned int initial_lcn)
466{
467 struct erofs_inode *const vi = EROFS_I(m->inode);
468 struct erofs_map_blocks *const map = m->map;
469 const unsigned int lclusterbits = vi->z_logical_clusterbits;
470 unsigned long lcn;
471 int err;
472
473 DBG_BUGON(m->type != Z_EROFS_VLE_CLUSTER_TYPE_PLAIN &&
474 m->type != Z_EROFS_VLE_CLUSTER_TYPE_HEAD);
475 if (!(map->m_flags & EROFS_MAP_ZIPPED) ||
476 !(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1)) {
477 map->m_plen = 1 << lclusterbits;
478 return 0;
479 }
480
481 lcn = m->lcn + 1;
482 if (m->compressedlcs)
483 goto out;
484
485 err = z_erofs_load_cluster_from_disk(m, lcn, false);
486 if (err)
487 return err;
488
489
490
491
492
493
494
495
496
497 DBG_BUGON(lcn == initial_lcn &&
498 m->type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD);
499
500 switch (m->type) {
501 case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
502 case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
503
504
505
506
507 m->compressedlcs = 1;
508 break;
509 case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
510 if (m->delta[0] != 1)
511 goto err_bonus_cblkcnt;
512 if (m->compressedlcs)
513 break;
514 fallthrough;
515 default:
516 erofs_err(m->inode->i_sb,
517 "cannot found CBLKCNT @ lcn %lu of nid %llu",
518 lcn, vi->nid);
519 DBG_BUGON(1);
520 return -EFSCORRUPTED;
521 }
522out:
523 map->m_plen = m->compressedlcs << lclusterbits;
524 return 0;
525err_bonus_cblkcnt:
526 erofs_err(m->inode->i_sb,
527 "bogus CBLKCNT @ lcn %lu of nid %llu",
528 lcn, vi->nid);
529 DBG_BUGON(1);
530 return -EFSCORRUPTED;
531}
532
533static int z_erofs_get_extent_decompressedlen(struct z_erofs_maprecorder *m)
534{
535 struct inode *inode = m->inode;
536 struct erofs_inode *vi = EROFS_I(inode);
537 struct erofs_map_blocks *map = m->map;
538 unsigned int lclusterbits = vi->z_logical_clusterbits;
539 u64 lcn = m->lcn, headlcn = map->m_la >> lclusterbits;
540 int err;
541
542 do {
543
544 if ((lcn << lclusterbits) >= inode->i_size) {
545 map->m_llen = inode->i_size - map->m_la;
546 return 0;
547 }
548
549 err = z_erofs_load_cluster_from_disk(m, lcn, true);
550 if (err)
551 return err;
552
553 if (m->type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
554 DBG_BUGON(!m->delta[1] &&
555 m->clusterofs != 1 << lclusterbits);
556 } else if (m->type == Z_EROFS_VLE_CLUSTER_TYPE_PLAIN ||
557 m->type == Z_EROFS_VLE_CLUSTER_TYPE_HEAD) {
558
559 if (lcn != headlcn)
560 break;
561 m->delta[1] = 1;
562 } else {
563 erofs_err(inode->i_sb, "unknown type %u @ lcn %llu of nid %llu",
564 m->type, lcn, vi->nid);
565 DBG_BUGON(1);
566 return -EOPNOTSUPP;
567 }
568 lcn += m->delta[1];
569 } while (m->delta[1]);
570
571 map->m_llen = (lcn << lclusterbits) + m->clusterofs - map->m_la;
572 return 0;
573}
574
575int z_erofs_map_blocks_iter(struct inode *inode,
576 struct erofs_map_blocks *map,
577 int flags)
578{
579 struct erofs_inode *const vi = EROFS_I(inode);
580 struct z_erofs_maprecorder m = {
581 .inode = inode,
582 .map = map,
583 };
584 int err = 0;
585 unsigned int lclusterbits, endoff;
586 unsigned long initial_lcn;
587 unsigned long long ofs, end;
588
589 trace_z_erofs_map_blocks_iter_enter(inode, map, flags);
590
591
592 if (map->m_la >= inode->i_size) {
593 map->m_llen = map->m_la + 1 - inode->i_size;
594 map->m_la = inode->i_size;
595 map->m_flags = 0;
596 goto out;
597 }
598
599 err = z_erofs_fill_inode_lazy(inode);
600 if (err)
601 goto out;
602
603 lclusterbits = vi->z_logical_clusterbits;
604 ofs = map->m_la;
605 initial_lcn = ofs >> lclusterbits;
606 endoff = ofs & ((1 << lclusterbits) - 1);
607
608 err = z_erofs_load_cluster_from_disk(&m, initial_lcn, false);
609 if (err)
610 goto unmap_out;
611
612 map->m_flags = EROFS_MAP_ZIPPED;
613 end = (m.lcn + 1ULL) << lclusterbits;
614
615 switch (m.type) {
616 case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
617 if (endoff >= m.clusterofs)
618 map->m_flags &= ~EROFS_MAP_ZIPPED;
619 fallthrough;
620 case Z_EROFS_VLE_CLUSTER_TYPE_HEAD:
621 if (endoff >= m.clusterofs) {
622 map->m_la = (m.lcn << lclusterbits) | m.clusterofs;
623 break;
624 }
625
626 if (!m.lcn) {
627 erofs_err(inode->i_sb,
628 "invalid logical cluster 0 at nid %llu",
629 vi->nid);
630 err = -EFSCORRUPTED;
631 goto unmap_out;
632 }
633 end = (m.lcn << lclusterbits) | m.clusterofs;
634 map->m_flags |= EROFS_MAP_FULL_MAPPED;
635 m.delta[0] = 1;
636 fallthrough;
637 case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
638
639 err = z_erofs_extent_lookback(&m, m.delta[0]);
640 if (err)
641 goto unmap_out;
642 break;
643 default:
644 erofs_err(inode->i_sb,
645 "unknown type %u @ offset %llu of nid %llu",
646 m.type, ofs, vi->nid);
647 err = -EOPNOTSUPP;
648 goto unmap_out;
649 }
650
651 map->m_llen = end - map->m_la;
652 map->m_pa = blknr_to_addr(m.pblk);
653 map->m_flags |= EROFS_MAP_MAPPED;
654
655 err = z_erofs_get_extent_compressedlen(&m, initial_lcn);
656 if (err)
657 goto out;
658
659 if (flags & EROFS_GET_BLOCKS_FIEMAP) {
660 err = z_erofs_get_extent_decompressedlen(&m);
661 if (!err)
662 map->m_flags |= EROFS_MAP_FULL_MAPPED;
663 }
664unmap_out:
665 if (m.kaddr)
666 kunmap_atomic(m.kaddr);
667
668out:
669 erofs_dbg("%s, m_la %llu m_pa %llu m_llen %llu m_plen %llu m_flags 0%o",
670 __func__, map->m_la, map->m_pa,
671 map->m_llen, map->m_plen, map->m_flags);
672
673 trace_z_erofs_map_blocks_iter_exit(inode, map, flags, err);
674
675
676 DBG_BUGON(err < 0 && err != -ENOMEM);
677 return err;
678}
679
680static int z_erofs_iomap_begin_report(struct inode *inode, loff_t offset,
681 loff_t length, unsigned int flags,
682 struct iomap *iomap, struct iomap *srcmap)
683{
684 int ret;
685 struct erofs_map_blocks map = { .m_la = offset };
686
687 ret = z_erofs_map_blocks_iter(inode, &map, EROFS_GET_BLOCKS_FIEMAP);
688 if (map.mpage)
689 put_page(map.mpage);
690 if (ret < 0)
691 return ret;
692
693 iomap->bdev = inode->i_sb->s_bdev;
694 iomap->offset = map.m_la;
695 iomap->length = map.m_llen;
696 if (map.m_flags & EROFS_MAP_MAPPED) {
697 iomap->type = IOMAP_MAPPED;
698 iomap->addr = map.m_pa;
699 } else {
700 iomap->type = IOMAP_HOLE;
701 iomap->addr = IOMAP_NULL_ADDR;
702
703
704
705
706
707 if (iomap->offset >= inode->i_size)
708 iomap->length = length + map.m_la - offset;
709 }
710 iomap->flags = 0;
711 return 0;
712}
713
714const struct iomap_ops z_erofs_iomap_report_ops = {
715 .iomap_begin = z_erofs_iomap_begin_report,
716};
717
