1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2018-2019 HUAWEI, Inc.
4 * https://www.huawei.com/
7 #include <asm/unaligned.h>
8 #include <trace/events/erofs.h>
10 static int z_erofs_do_map_blocks(struct inode *inode,
11 struct erofs_map_blocks *map,
14 int z_erofs_fill_inode(struct inode *inode)
16 struct erofs_inode *const vi = EROFS_I(inode);
17 struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
19 if (!erofs_sb_has_big_pcluster(sbi) &&
20 !erofs_sb_has_ztailpacking(sbi) &&
21 vi->datalayout == EROFS_INODE_FLAT_COMPRESSION_LEGACY) {
23 vi->z_algorithmtype[0] = 0;
24 vi->z_algorithmtype[1] = 0;
25 vi->z_logical_clusterbits = LOG_BLOCK_SIZE;
26 set_bit(EROFS_I_Z_INITED_BIT, &vi->flags);
28 inode->i_mapping->a_ops = &z_erofs_aops;
32 static int z_erofs_fill_inode_lazy(struct inode *inode)
34 struct erofs_inode *const vi = EROFS_I(inode);
35 struct super_block *const sb = inode->i_sb;
38 struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
40 struct z_erofs_map_header *h;
42 if (test_bit(EROFS_I_Z_INITED_BIT, &vi->flags)) {
44 * paired with smp_mb() at the end of the function to ensure
45 * fields will only be observed after the bit is set.
51 if (wait_on_bit_lock(&vi->flags, EROFS_I_BL_Z_BIT, TASK_KILLABLE))
55 if (test_bit(EROFS_I_Z_INITED_BIT, &vi->flags))
58 DBG_BUGON(!erofs_sb_has_big_pcluster(EROFS_SB(sb)) &&
59 !erofs_sb_has_ztailpacking(EROFS_SB(sb)) &&
60 vi->datalayout == EROFS_INODE_FLAT_COMPRESSION_LEGACY);
62 pos = ALIGN(iloc(EROFS_SB(sb), vi->nid) + vi->inode_isize +
64 kaddr = erofs_read_metabuf(&buf, sb, erofs_blknr(pos),
71 h = kaddr + erofs_blkoff(pos);
72 vi->z_advise = le16_to_cpu(h->h_advise);
73 vi->z_algorithmtype[0] = h->h_algorithmtype & 15;
74 vi->z_algorithmtype[1] = h->h_algorithmtype >> 4;
77 if (vi->z_algorithmtype[0] >= Z_EROFS_COMPRESSION_MAX ||
78 vi->z_algorithmtype[++headnr] >= Z_EROFS_COMPRESSION_MAX) {
79 erofs_err(sb, "unknown HEAD%u format %u for nid %llu, please upgrade kernel",
80 headnr + 1, vi->z_algorithmtype[headnr], vi->nid);
85 vi->z_logical_clusterbits = LOG_BLOCK_SIZE + (h->h_clusterbits & 7);
86 if (!erofs_sb_has_big_pcluster(EROFS_SB(sb)) &&
87 vi->z_advise & (Z_EROFS_ADVISE_BIG_PCLUSTER_1 |
88 Z_EROFS_ADVISE_BIG_PCLUSTER_2)) {
89 erofs_err(sb, "per-inode big pcluster without sb feature for nid %llu",
94 if (vi->datalayout == EROFS_INODE_FLAT_COMPRESSION &&
95 !(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1) ^
96 !(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_2)) {
97 erofs_err(sb, "big pcluster head1/2 of compact indexes should be consistent for nid %llu",
103 erofs_put_metabuf(&buf);
107 if (vi->z_advise & Z_EROFS_ADVISE_INLINE_PCLUSTER) {
108 struct erofs_map_blocks map = {
109 .buf = __EROFS_BUF_INITIALIZER
112 vi->z_idata_size = le16_to_cpu(h->h_idata_size);
113 err = z_erofs_do_map_blocks(inode, &map,
114 EROFS_GET_BLOCKS_FINDTAIL);
115 erofs_put_metabuf(&map.buf);
118 erofs_blkoff(map.m_pa) + map.m_plen > EROFS_BLKSIZ) {
119 erofs_err(sb, "invalid tail-packing pclustersize %llu",
126 /* paired with smp_mb() at the beginning of the function */
128 set_bit(EROFS_I_Z_INITED_BIT, &vi->flags);
130 clear_and_wake_up_bit(EROFS_I_BL_Z_BIT, &vi->flags);
134 struct z_erofs_maprecorder {
136 struct erofs_map_blocks *map;
140 /* compression extent information gathered */
144 erofs_blk_t pblk, compressedlcs;
145 erofs_off_t nextpackoff;
148 static int z_erofs_reload_indexes(struct z_erofs_maprecorder *m,
151 struct super_block *const sb = m->inode->i_sb;
153 m->kaddr = erofs_read_metabuf(&m->map->buf, sb, eblk,
155 if (IS_ERR(m->kaddr))
156 return PTR_ERR(m->kaddr);
160 static int legacy_load_cluster_from_disk(struct z_erofs_maprecorder *m,
163 struct inode *const inode = m->inode;
164 struct erofs_inode *const vi = EROFS_I(inode);
165 const erofs_off_t ibase = iloc(EROFS_I_SB(inode), vi->nid);
166 const erofs_off_t pos =
167 Z_EROFS_VLE_LEGACY_INDEX_ALIGN(ibase + vi->inode_isize +
169 lcn * sizeof(struct z_erofs_vle_decompressed_index);
170 struct z_erofs_vle_decompressed_index *di;
171 unsigned int advise, type;
174 err = z_erofs_reload_indexes(m, erofs_blknr(pos));
178 m->nextpackoff = pos + sizeof(struct z_erofs_vle_decompressed_index);
180 di = m->kaddr + erofs_blkoff(pos);
182 advise = le16_to_cpu(di->di_advise);
183 type = (advise >> Z_EROFS_VLE_DI_CLUSTER_TYPE_BIT) &
184 ((1 << Z_EROFS_VLE_DI_CLUSTER_TYPE_BITS) - 1);
186 case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
187 m->clusterofs = 1 << vi->z_logical_clusterbits;
188 m->delta[0] = le16_to_cpu(di->di_u.delta[0]);
189 if (m->delta[0] & Z_EROFS_VLE_DI_D0_CBLKCNT) {
190 if (!(vi->z_advise & (Z_EROFS_ADVISE_BIG_PCLUSTER_1 |
191 Z_EROFS_ADVISE_BIG_PCLUSTER_2))) {
193 return -EFSCORRUPTED;
195 m->compressedlcs = m->delta[0] &
196 ~Z_EROFS_VLE_DI_D0_CBLKCNT;
199 m->delta[1] = le16_to_cpu(di->di_u.delta[1]);
201 case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
202 case Z_EROFS_VLE_CLUSTER_TYPE_HEAD1:
203 case Z_EROFS_VLE_CLUSTER_TYPE_HEAD2:
204 m->clusterofs = le16_to_cpu(di->di_clusterofs);
205 m->pblk = le32_to_cpu(di->di_u.blkaddr);
215 static unsigned int decode_compactedbits(unsigned int lobits,
217 u8 *in, unsigned int pos, u8 *type)
219 const unsigned int v = get_unaligned_le32(in + pos / 8) >> (pos & 7);
220 const unsigned int lo = v & lomask;
222 *type = (v >> lobits) & 3;
226 static int get_compacted_la_distance(unsigned int lclusterbits,
227 unsigned int encodebits,
228 unsigned int vcnt, u8 *in, int i)
230 const unsigned int lomask = (1 << lclusterbits) - 1;
231 unsigned int lo, d1 = 0;
234 DBG_BUGON(i >= vcnt);
237 lo = decode_compactedbits(lclusterbits, lomask,
238 in, encodebits * i, &type);
240 if (type != Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
243 } while (++i < vcnt);
245 /* vcnt - 1 (Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) item */
246 if (!(lo & Z_EROFS_VLE_DI_D0_CBLKCNT))
251 static int unpack_compacted_index(struct z_erofs_maprecorder *m,
252 unsigned int amortizedshift,
253 erofs_off_t pos, bool lookahead)
255 struct erofs_inode *const vi = EROFS_I(m->inode);
256 const unsigned int lclusterbits = vi->z_logical_clusterbits;
257 const unsigned int lomask = (1 << lclusterbits) - 1;
258 unsigned int vcnt, base, lo, encodebits, nblk, eofs;
263 if (1 << amortizedshift == 4)
265 else if (1 << amortizedshift == 2 && lclusterbits == 12)
270 /* it doesn't equal to round_up(..) */
271 m->nextpackoff = round_down(pos, vcnt << amortizedshift) +
272 (vcnt << amortizedshift);
273 big_pcluster = vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1;
274 encodebits = ((vcnt << amortizedshift) - sizeof(__le32)) * 8 / vcnt;
275 eofs = erofs_blkoff(pos);
276 base = round_down(eofs, vcnt << amortizedshift);
277 in = m->kaddr + base;
279 i = (eofs - base) >> amortizedshift;
281 lo = decode_compactedbits(lclusterbits, lomask,
282 in, encodebits * i, &type);
284 if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
285 m->clusterofs = 1 << lclusterbits;
287 /* figure out lookahead_distance: delta[1] if needed */
289 m->delta[1] = get_compacted_la_distance(lclusterbits,
290 encodebits, vcnt, in, i);
291 if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT) {
294 return -EFSCORRUPTED;
296 m->compressedlcs = lo & ~Z_EROFS_VLE_DI_D0_CBLKCNT;
299 } else if (i + 1 != (int)vcnt) {
304 * since the last lcluster in the pack is special,
305 * of which lo saves delta[1] rather than delta[0].
306 * Hence, get delta[0] by the previous lcluster indirectly.
308 lo = decode_compactedbits(lclusterbits, lomask,
309 in, encodebits * (i - 1), &type);
310 if (type != Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
312 else if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT)
314 m->delta[0] = lo + 1;
319 /* figout out blkaddr (pblk) for HEAD lclusters */
324 lo = decode_compactedbits(lclusterbits, lomask,
325 in, encodebits * i, &type);
326 if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD)
336 lo = decode_compactedbits(lclusterbits, lomask,
337 in, encodebits * i, &type);
338 if (type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
339 if (lo & Z_EROFS_VLE_DI_D0_CBLKCNT) {
341 nblk += lo & ~Z_EROFS_VLE_DI_D0_CBLKCNT;
344 /* bigpcluster shouldn't have plain d0 == 1 */
347 return -EFSCORRUPTED;
355 in += (vcnt << amortizedshift) - sizeof(__le32);
356 m->pblk = le32_to_cpu(*(__le32 *)in) + nblk;
360 static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m,
361 unsigned long lcn, bool lookahead)
363 struct inode *const inode = m->inode;
364 struct erofs_inode *const vi = EROFS_I(inode);
365 const unsigned int lclusterbits = vi->z_logical_clusterbits;
366 const erofs_off_t ebase = ALIGN(iloc(EROFS_I_SB(inode), vi->nid) +
367 vi->inode_isize + vi->xattr_isize, 8) +
368 sizeof(struct z_erofs_map_header);
369 const unsigned int totalidx = DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ);
370 unsigned int compacted_4b_initial, compacted_2b;
371 unsigned int amortizedshift;
375 if (lclusterbits != 12)
382 /* used to align to 32-byte (compacted_2b) alignment */
383 compacted_4b_initial = (32 - ebase % 32) / 4;
384 if (compacted_4b_initial == 32 / 4)
385 compacted_4b_initial = 0;
387 if ((vi->z_advise & Z_EROFS_ADVISE_COMPACTED_2B) &&
388 compacted_4b_initial < totalidx)
389 compacted_2b = rounddown(totalidx - compacted_4b_initial, 16);
394 if (lcn < compacted_4b_initial) {
398 pos += compacted_4b_initial * 4;
399 lcn -= compacted_4b_initial;
401 if (lcn < compacted_2b) {
405 pos += compacted_2b * 2;
409 pos += lcn * (1 << amortizedshift);
410 err = z_erofs_reload_indexes(m, erofs_blknr(pos));
413 return unpack_compacted_index(m, amortizedshift, pos, lookahead);
416 static int z_erofs_load_cluster_from_disk(struct z_erofs_maprecorder *m,
417 unsigned int lcn, bool lookahead)
419 const unsigned int datamode = EROFS_I(m->inode)->datalayout;
421 if (datamode == EROFS_INODE_FLAT_COMPRESSION_LEGACY)
422 return legacy_load_cluster_from_disk(m, lcn);
424 if (datamode == EROFS_INODE_FLAT_COMPRESSION)
425 return compacted_load_cluster_from_disk(m, lcn, lookahead);
430 static int z_erofs_extent_lookback(struct z_erofs_maprecorder *m,
431 unsigned int lookback_distance)
433 struct erofs_inode *const vi = EROFS_I(m->inode);
434 struct erofs_map_blocks *const map = m->map;
435 const unsigned int lclusterbits = vi->z_logical_clusterbits;
436 unsigned long lcn = m->lcn;
439 if (lcn < lookback_distance) {
440 erofs_err(m->inode->i_sb,
441 "bogus lookback distance @ nid %llu", vi->nid);
443 return -EFSCORRUPTED;
446 /* load extent head logical cluster if needed */
447 lcn -= lookback_distance;
448 err = z_erofs_load_cluster_from_disk(m, lcn, false);
453 case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
455 erofs_err(m->inode->i_sb,
456 "invalid lookback distance 0 @ nid %llu",
459 return -EFSCORRUPTED;
461 return z_erofs_extent_lookback(m, m->delta[0]);
462 case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
463 case Z_EROFS_VLE_CLUSTER_TYPE_HEAD1:
464 case Z_EROFS_VLE_CLUSTER_TYPE_HEAD2:
465 m->headtype = m->type;
466 map->m_la = (lcn << lclusterbits) | m->clusterofs;
469 erofs_err(m->inode->i_sb,
470 "unknown type %u @ lcn %lu of nid %llu",
471 m->type, lcn, vi->nid);
478 static int z_erofs_get_extent_compressedlen(struct z_erofs_maprecorder *m,
479 unsigned int initial_lcn)
481 struct erofs_inode *const vi = EROFS_I(m->inode);
482 struct erofs_map_blocks *const map = m->map;
483 const unsigned int lclusterbits = vi->z_logical_clusterbits;
487 DBG_BUGON(m->type != Z_EROFS_VLE_CLUSTER_TYPE_PLAIN &&
488 m->type != Z_EROFS_VLE_CLUSTER_TYPE_HEAD1 &&
489 m->type != Z_EROFS_VLE_CLUSTER_TYPE_HEAD2);
490 DBG_BUGON(m->type != m->headtype);
492 if (m->headtype == Z_EROFS_VLE_CLUSTER_TYPE_PLAIN ||
493 ((m->headtype == Z_EROFS_VLE_CLUSTER_TYPE_HEAD1) &&
494 !(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_1)) ||
495 ((m->headtype == Z_EROFS_VLE_CLUSTER_TYPE_HEAD2) &&
496 !(vi->z_advise & Z_EROFS_ADVISE_BIG_PCLUSTER_2))) {
497 map->m_plen = 1 << lclusterbits;
501 if (m->compressedlcs)
504 err = z_erofs_load_cluster_from_disk(m, lcn, false);
509 * If the 1st NONHEAD lcluster has already been handled initially w/o
510 * valid compressedlcs, which means at least it mustn't be CBLKCNT, or
511 * an internal implemenatation error is detected.
513 * The following code can also handle it properly anyway, but let's
514 * BUG_ON in the debugging mode only for developers to notice that.
516 DBG_BUGON(lcn == initial_lcn &&
517 m->type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD);
520 case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
521 case Z_EROFS_VLE_CLUSTER_TYPE_HEAD1:
522 case Z_EROFS_VLE_CLUSTER_TYPE_HEAD2:
524 * if the 1st NONHEAD lcluster is actually PLAIN or HEAD type
525 * rather than CBLKCNT, it's a 1 lcluster-sized pcluster.
527 m->compressedlcs = 1;
529 case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
530 if (m->delta[0] != 1)
531 goto err_bonus_cblkcnt;
532 if (m->compressedlcs)
536 erofs_err(m->inode->i_sb,
537 "cannot found CBLKCNT @ lcn %lu of nid %llu",
540 return -EFSCORRUPTED;
543 map->m_plen = m->compressedlcs << lclusterbits;
546 erofs_err(m->inode->i_sb,
547 "bogus CBLKCNT @ lcn %lu of nid %llu",
550 return -EFSCORRUPTED;
553 static int z_erofs_get_extent_decompressedlen(struct z_erofs_maprecorder *m)
555 struct inode *inode = m->inode;
556 struct erofs_inode *vi = EROFS_I(inode);
557 struct erofs_map_blocks *map = m->map;
558 unsigned int lclusterbits = vi->z_logical_clusterbits;
559 u64 lcn = m->lcn, headlcn = map->m_la >> lclusterbits;
563 /* handle the last EOF pcluster (no next HEAD lcluster) */
564 if ((lcn << lclusterbits) >= inode->i_size) {
565 map->m_llen = inode->i_size - map->m_la;
569 err = z_erofs_load_cluster_from_disk(m, lcn, true);
573 if (m->type == Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD) {
574 DBG_BUGON(!m->delta[1] &&
575 m->clusterofs != 1 << lclusterbits);
576 } else if (m->type == Z_EROFS_VLE_CLUSTER_TYPE_PLAIN ||
577 m->type == Z_EROFS_VLE_CLUSTER_TYPE_HEAD1 ||
578 m->type == Z_EROFS_VLE_CLUSTER_TYPE_HEAD2) {
579 /* go on until the next HEAD lcluster */
584 erofs_err(inode->i_sb, "unknown type %u @ lcn %llu of nid %llu",
585 m->type, lcn, vi->nid);
590 } while (m->delta[1]);
592 map->m_llen = (lcn << lclusterbits) + m->clusterofs - map->m_la;
596 static int z_erofs_do_map_blocks(struct inode *inode,
597 struct erofs_map_blocks *map,
600 struct erofs_inode *const vi = EROFS_I(inode);
601 bool ztailpacking = vi->z_advise & Z_EROFS_ADVISE_INLINE_PCLUSTER;
602 struct z_erofs_maprecorder m = {
607 unsigned int lclusterbits, endoff;
608 unsigned long initial_lcn;
609 unsigned long long ofs, end;
611 lclusterbits = vi->z_logical_clusterbits;
612 ofs = flags & EROFS_GET_BLOCKS_FINDTAIL ? inode->i_size - 1 : map->m_la;
613 initial_lcn = ofs >> lclusterbits;
614 endoff = ofs & ((1 << lclusterbits) - 1);
616 err = z_erofs_load_cluster_from_disk(&m, initial_lcn, false);
620 if (ztailpacking && (flags & EROFS_GET_BLOCKS_FINDTAIL))
621 vi->z_idataoff = m.nextpackoff;
623 map->m_flags = EROFS_MAP_MAPPED | EROFS_MAP_ENCODED;
624 end = (m.lcn + 1ULL) << lclusterbits;
627 case Z_EROFS_VLE_CLUSTER_TYPE_PLAIN:
628 case Z_EROFS_VLE_CLUSTER_TYPE_HEAD1:
629 case Z_EROFS_VLE_CLUSTER_TYPE_HEAD2:
630 if (endoff >= m.clusterofs) {
632 map->m_la = (m.lcn << lclusterbits) | m.clusterofs;
635 /* m.lcn should be >= 1 if endoff < m.clusterofs */
637 erofs_err(inode->i_sb,
638 "invalid logical cluster 0 at nid %llu",
643 end = (m.lcn << lclusterbits) | m.clusterofs;
644 map->m_flags |= EROFS_MAP_FULL_MAPPED;
647 case Z_EROFS_VLE_CLUSTER_TYPE_NONHEAD:
648 /* get the corresponding first chunk */
649 err = z_erofs_extent_lookback(&m, m.delta[0]);
654 erofs_err(inode->i_sb,
655 "unknown type %u @ offset %llu of nid %llu",
656 m.type, ofs, vi->nid);
661 map->m_llen = end - map->m_la;
663 if (flags & EROFS_GET_BLOCKS_FINDTAIL)
664 vi->z_tailextent_headlcn = m.lcn;
665 if (ztailpacking && m.lcn == vi->z_tailextent_headlcn) {
666 map->m_flags |= EROFS_MAP_META;
667 map->m_pa = vi->z_idataoff;
668 map->m_plen = vi->z_idata_size;
670 map->m_pa = blknr_to_addr(m.pblk);
671 err = z_erofs_get_extent_compressedlen(&m, initial_lcn);
676 if (m.headtype == Z_EROFS_VLE_CLUSTER_TYPE_PLAIN)
677 map->m_algorithmformat = Z_EROFS_COMPRESSION_SHIFTED;
678 else if (m.headtype == Z_EROFS_VLE_CLUSTER_TYPE_HEAD2)
679 map->m_algorithmformat = vi->z_algorithmtype[1];
681 map->m_algorithmformat = vi->z_algorithmtype[0];
683 if ((flags & EROFS_GET_BLOCKS_FIEMAP) ||
684 ((flags & EROFS_GET_BLOCKS_READMORE) &&
685 map->m_algorithmformat == Z_EROFS_COMPRESSION_LZMA &&
686 map->m_llen >= EROFS_BLKSIZ)) {
687 err = z_erofs_get_extent_decompressedlen(&m);
689 map->m_flags |= EROFS_MAP_FULL_MAPPED;
692 erofs_unmap_metabuf(&m.map->buf);
695 erofs_dbg("%s, m_la %llu m_pa %llu m_llen %llu m_plen %llu m_flags 0%o",
696 __func__, map->m_la, map->m_pa,
697 map->m_llen, map->m_plen, map->m_flags);
702 int z_erofs_map_blocks_iter(struct inode *inode,
703 struct erofs_map_blocks *map,
708 trace_z_erofs_map_blocks_iter_enter(inode, map, flags);
710 /* when trying to read beyond EOF, leave it unmapped */
711 if (map->m_la >= inode->i_size) {
712 map->m_llen = map->m_la + 1 - inode->i_size;
713 map->m_la = inode->i_size;
718 err = z_erofs_fill_inode_lazy(inode);
722 err = z_erofs_do_map_blocks(inode, map, flags);
724 trace_z_erofs_map_blocks_iter_exit(inode, map, flags, err);
726 /* aggressively BUG_ON iff CONFIG_EROFS_FS_DEBUG is on */
727 DBG_BUGON(err < 0 && err != -ENOMEM);
731 static int z_erofs_iomap_begin_report(struct inode *inode, loff_t offset,
732 loff_t length, unsigned int flags,
733 struct iomap *iomap, struct iomap *srcmap)
736 struct erofs_map_blocks map = { .m_la = offset };
738 ret = z_erofs_map_blocks_iter(inode, &map, EROFS_GET_BLOCKS_FIEMAP);
739 erofs_put_metabuf(&map.buf);
743 iomap->bdev = inode->i_sb->s_bdev;
744 iomap->offset = map.m_la;
745 iomap->length = map.m_llen;
746 if (map.m_flags & EROFS_MAP_MAPPED) {
747 iomap->type = IOMAP_MAPPED;
748 iomap->addr = map.m_pa;
750 iomap->type = IOMAP_HOLE;
751 iomap->addr = IOMAP_NULL_ADDR;
753 * No strict rule how to describe extents for post EOF, yet
754 * we need do like below. Otherwise, iomap itself will get
755 * into an endless loop on post EOF.
757 if (iomap->offset >= inode->i_size)
758 iomap->length = length + map.m_la - offset;
764 const struct iomap_ops z_erofs_iomap_report_ops = {
765 .iomap_begin = z_erofs_iomap_begin_report,