1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 *
4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
5 *
6 * TODO: Merge attr_set_size/attr_data_get_block/attr_allocate_frame?
7 */
8
9 #include <linux/fs.h>
10 #include <linux/slab.h>
11 #include <linux/kernel.h>
12
13 #include "debug.h"
14 #include "ntfs.h"
15 #include "ntfs_fs.h"
16
17 /*
18 * You can set external NTFS_MIN_LOG2_OF_CLUMP/NTFS_MAX_LOG2_OF_CLUMP to manage
19 * preallocate algorithm.
20 */
21 #ifndef NTFS_MIN_LOG2_OF_CLUMP
22 #define NTFS_MIN_LOG2_OF_CLUMP 16
23 #endif
24
25 #ifndef NTFS_MAX_LOG2_OF_CLUMP
26 #define NTFS_MAX_LOG2_OF_CLUMP 26
27 #endif
28
29 // 16M
30 #define NTFS_CLUMP_MIN (1 << (NTFS_MIN_LOG2_OF_CLUMP + 8))
31 // 16G
32 #define NTFS_CLUMP_MAX (1ull << (NTFS_MAX_LOG2_OF_CLUMP + 8))
33
get_pre_allocated(u64 size)34 static inline u64 get_pre_allocated(u64 size)
35 {
36 u32 clump;
37 u8 align_shift;
38 u64 ret;
39
40 if (size <= NTFS_CLUMP_MIN) {
41 clump = 1 << NTFS_MIN_LOG2_OF_CLUMP;
42 align_shift = NTFS_MIN_LOG2_OF_CLUMP;
43 } else if (size >= NTFS_CLUMP_MAX) {
44 clump = 1 << NTFS_MAX_LOG2_OF_CLUMP;
45 align_shift = NTFS_MAX_LOG2_OF_CLUMP;
46 } else {
47 align_shift = NTFS_MIN_LOG2_OF_CLUMP - 1 +
48 __ffs(size >> (8 + NTFS_MIN_LOG2_OF_CLUMP));
49 clump = 1u << align_shift;
50 }
51
52 ret = (((size + clump - 1) >> align_shift)) << align_shift;
53
54 return ret;
55 }
56
57 /*
58 * attr_load_runs - Load all runs stored in @attr.
59 */
attr_load_runs(struct ATTRIB * attr,struct ntfs_inode * ni,struct runs_tree * run,const CLST * vcn)60 static int attr_load_runs(struct ATTRIB *attr, struct ntfs_inode *ni,
61 struct runs_tree *run, const CLST *vcn)
62 {
63 int err;
64 CLST svcn = le64_to_cpu(attr->nres.svcn);
65 CLST evcn = le64_to_cpu(attr->nres.evcn);
66 u32 asize;
67 u16 run_off;
68
69 if (svcn >= evcn + 1 || run_is_mapped_full(run, svcn, evcn))
70 return 0;
71
72 if (vcn && (evcn < *vcn || *vcn < svcn))
73 return -EINVAL;
74
75 asize = le32_to_cpu(attr->size);
76 run_off = le16_to_cpu(attr->nres.run_off);
77
78 if (run_off > asize)
79 return -EINVAL;
80
81 err = run_unpack_ex(run, ni->mi.sbi, ni->mi.rno, svcn, evcn,
82 vcn ? *vcn : svcn, Add2Ptr(attr, run_off),
83 asize - run_off);
84 if (err < 0)
85 return err;
86
87 return 0;
88 }
89
90 /*
91 * run_deallocate_ex - Deallocate clusters.
92 */
run_deallocate_ex(struct ntfs_sb_info * sbi,struct runs_tree * run,CLST vcn,CLST len,CLST * done,bool trim)93 static int run_deallocate_ex(struct ntfs_sb_info *sbi, struct runs_tree *run,
94 CLST vcn, CLST len, CLST *done, bool trim)
95 {
96 int err = 0;
97 CLST vcn_next, vcn0 = vcn, lcn, clen, dn = 0;
98 size_t idx;
99
100 if (!len)
101 goto out;
102
103 if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) {
104 failed:
105 run_truncate(run, vcn0);
106 err = -EINVAL;
107 goto out;
108 }
109
110 for (;;) {
111 if (clen > len)
112 clen = len;
113
114 if (!clen) {
115 err = -EINVAL;
116 goto out;
117 }
118
119 if (lcn != SPARSE_LCN) {
120 if (sbi) {
121 /* mark bitmap range [lcn + clen) as free and trim clusters. */
122 mark_as_free_ex(sbi, lcn, clen, trim);
123 }
124 dn += clen;
125 }
126
127 len -= clen;
128 if (!len)
129 break;
130
131 vcn_next = vcn + clen;
132 if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) ||
133 vcn != vcn_next) {
134 /* Save memory - don't load entire run. */
135 goto failed;
136 }
137 }
138
139 out:
140 if (done)
141 *done += dn;
142
143 return err;
144 }
145
146 /*
147 * attr_allocate_clusters - Find free space, mark it as used and store in @run.
148 */
attr_allocate_clusters(struct ntfs_sb_info * sbi,struct runs_tree * run,CLST vcn,CLST lcn,CLST len,CLST * pre_alloc,enum ALLOCATE_OPT opt,CLST * alen,const size_t fr,CLST * new_lcn,CLST * new_len)149 int attr_allocate_clusters(struct ntfs_sb_info *sbi, struct runs_tree *run,
150 CLST vcn, CLST lcn, CLST len, CLST *pre_alloc,
151 enum ALLOCATE_OPT opt, CLST *alen, const size_t fr,
152 CLST *new_lcn, CLST *new_len)
153 {
154 int err;
155 CLST flen, vcn0 = vcn, pre = pre_alloc ? *pre_alloc : 0;
156 size_t cnt = run->count;
157
158 for (;;) {
159 err = ntfs_look_for_free_space(sbi, lcn, len + pre, &lcn, &flen,
160 opt);
161
162 if (err == -ENOSPC && pre) {
163 pre = 0;
164 if (*pre_alloc)
165 *pre_alloc = 0;
166 continue;
167 }
168
169 if (err)
170 goto out;
171
172 if (vcn == vcn0) {
173 /* Return the first fragment. */
174 if (new_lcn)
175 *new_lcn = lcn;
176 if (new_len)
177 *new_len = flen;
178 }
179
180 /* Add new fragment into run storage. */
181 if (!run_add_entry(run, vcn, lcn, flen, opt & ALLOCATE_MFT)) {
182 /* Undo last 'ntfs_look_for_free_space' */
183 mark_as_free_ex(sbi, lcn, len, false);
184 err = -ENOMEM;
185 goto out;
186 }
187
188 if (opt & ALLOCATE_ZERO) {
189 u8 shift = sbi->cluster_bits - SECTOR_SHIFT;
190
191 err = blkdev_issue_zeroout(sbi->sb->s_bdev,
192 (sector_t)lcn << shift,
193 (sector_t)flen << shift,
194 GFP_NOFS, 0);
195 if (err)
196 goto out;
197 }
198
199 vcn += flen;
200
201 if (flen >= len || (opt & ALLOCATE_MFT) ||
202 (fr && run->count - cnt >= fr)) {
203 *alen = vcn - vcn0;
204 return 0;
205 }
206
207 len -= flen;
208 }
209
210 out:
211 /* Undo 'ntfs_look_for_free_space' */
212 if (vcn - vcn0) {
213 run_deallocate_ex(sbi, run, vcn0, vcn - vcn0, NULL, false);
214 run_truncate(run, vcn0);
215 }
216
217 return err;
218 }
219
220 /*
221 * attr_make_nonresident
222 *
223 * If page is not NULL - it is already contains resident data
224 * and locked (called from ni_write_frame()).
225 */
attr_make_nonresident(struct ntfs_inode * ni,struct ATTRIB * attr,struct ATTR_LIST_ENTRY * le,struct mft_inode * mi,u64 new_size,struct runs_tree * run,struct ATTRIB ** ins_attr,struct page * page)226 int attr_make_nonresident(struct ntfs_inode *ni, struct ATTRIB *attr,
227 struct ATTR_LIST_ENTRY *le, struct mft_inode *mi,
228 u64 new_size, struct runs_tree *run,
229 struct ATTRIB **ins_attr, struct page *page)
230 {
231 struct ntfs_sb_info *sbi;
232 struct ATTRIB *attr_s;
233 struct MFT_REC *rec;
234 u32 used, asize, rsize, aoff;
235 bool is_data;
236 CLST len, alen;
237 char *next;
238 int err;
239
240 if (attr->non_res) {
241 *ins_attr = attr;
242 return 0;
243 }
244
245 sbi = mi->sbi;
246 rec = mi->mrec;
247 attr_s = NULL;
248 used = le32_to_cpu(rec->used);
249 asize = le32_to_cpu(attr->size);
250 next = Add2Ptr(attr, asize);
251 aoff = PtrOffset(rec, attr);
252 rsize = le32_to_cpu(attr->res.data_size);
253 is_data = attr->type == ATTR_DATA && !attr->name_len;
254
255 /* len - how many clusters required to store 'rsize' bytes */
256 if (is_attr_compressed(attr)) {
257 u8 shift = sbi->cluster_bits + NTFS_LZNT_CUNIT;
258 len = ((rsize + (1u << shift) - 1) >> shift) << NTFS_LZNT_CUNIT;
259 } else {
260 len = bytes_to_cluster(sbi, rsize);
261 }
262
263 run_init(run);
264
265 /* Make a copy of original attribute. */
266 attr_s = kmemdup(attr, asize, GFP_NOFS);
267 if (!attr_s) {
268 err = -ENOMEM;
269 goto out;
270 }
271
272 if (!len) {
273 /* Empty resident -> Empty nonresident. */
274 alen = 0;
275 } else {
276 const char *data = resident_data(attr);
277
278 err = attr_allocate_clusters(sbi, run, 0, 0, len, NULL,
279 ALLOCATE_DEF, &alen, 0, NULL,
280 NULL);
281 if (err)
282 goto out1;
283
284 if (!rsize) {
285 /* Empty resident -> Non empty nonresident. */
286 } else if (!is_data) {
287 err = ntfs_sb_write_run(sbi, run, 0, data, rsize, 0);
288 if (err)
289 goto out2;
290 } else if (!page) {
291 struct address_space *mapping = ni->vfs_inode.i_mapping;
292 struct folio *folio;
293
294 folio = __filemap_get_folio(
295 mapping, 0, FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
296 mapping_gfp_mask(mapping));
297 if (IS_ERR(folio)) {
298 err = PTR_ERR(folio);
299 goto out2;
300 }
301 folio_fill_tail(folio, 0, data, rsize);
302 folio_mark_uptodate(folio);
303 folio_mark_dirty(folio);
304 folio_unlock(folio);
305 folio_put(folio);
306 }
307 }
308
309 /* Remove original attribute. */
310 used -= asize;
311 memmove(attr, Add2Ptr(attr, asize), used - aoff);
312 rec->used = cpu_to_le32(used);
313 mi->dirty = true;
314 if (le)
315 al_remove_le(ni, le);
316
317 err = ni_insert_nonresident(ni, attr_s->type, attr_name(attr_s),
318 attr_s->name_len, run, 0, alen,
319 attr_s->flags, &attr, NULL, NULL);
320 if (err)
321 goto out3;
322
323 kfree(attr_s);
324 attr->nres.data_size = cpu_to_le64(rsize);
325 attr->nres.valid_size = attr->nres.data_size;
326
327 *ins_attr = attr;
328
329 if (is_data)
330 ni->ni_flags &= ~NI_FLAG_RESIDENT;
331
332 /* Resident attribute becomes non resident. */
333 return 0;
334
335 out3:
336 attr = Add2Ptr(rec, aoff);
337 memmove(next, attr, used - aoff);
338 memcpy(attr, attr_s, asize);
339 rec->used = cpu_to_le32(used + asize);
340 mi->dirty = true;
341 out2:
342 /* Undo: do not trim new allocated clusters. */
343 run_deallocate(sbi, run, false);
344 run_close(run);
345 out1:
346 kfree(attr_s);
347 out:
348 return err;
349 }
350
351 /*
352 * attr_set_size_res - Helper for attr_set_size().
353 */
attr_set_size_res(struct ntfs_inode * ni,struct ATTRIB * attr,struct ATTR_LIST_ENTRY * le,struct mft_inode * mi,u64 new_size,struct runs_tree * run,struct ATTRIB ** ins_attr)354 static int attr_set_size_res(struct ntfs_inode *ni, struct ATTRIB *attr,
355 struct ATTR_LIST_ENTRY *le, struct mft_inode *mi,
356 u64 new_size, struct runs_tree *run,
357 struct ATTRIB **ins_attr)
358 {
359 struct ntfs_sb_info *sbi = mi->sbi;
360 struct MFT_REC *rec = mi->mrec;
361 u32 used = le32_to_cpu(rec->used);
362 u32 asize = le32_to_cpu(attr->size);
363 u32 aoff = PtrOffset(rec, attr);
364 u32 rsize = le32_to_cpu(attr->res.data_size);
365 u32 tail = used - aoff - asize;
366 char *next = Add2Ptr(attr, asize);
367 s64 dsize = ALIGN(new_size, 8) - ALIGN(rsize, 8);
368
369 if (dsize < 0) {
370 memmove(next + dsize, next, tail);
371 } else if (dsize > 0) {
372 if (used + dsize > sbi->max_bytes_per_attr)
373 return attr_make_nonresident(ni, attr, le, mi, new_size,
374 run, ins_attr, NULL);
375
376 memmove(next + dsize, next, tail);
377 memset(next, 0, dsize);
378 }
379
380 if (new_size > rsize)
381 memset(Add2Ptr(resident_data(attr), rsize), 0,
382 new_size - rsize);
383
384 rec->used = cpu_to_le32(used + dsize);
385 attr->size = cpu_to_le32(asize + dsize);
386 attr->res.data_size = cpu_to_le32(new_size);
387 mi->dirty = true;
388 *ins_attr = attr;
389
390 return 0;
391 }
392
393 /*
394 * attr_set_size - Change the size of attribute.
395 *
396 * Extend:
397 * - Sparse/compressed: No allocated clusters.
398 * - Normal: Append allocated and preallocated new clusters.
399 * Shrink:
400 * - No deallocate if @keep_prealloc is set.
401 */
attr_set_size(struct ntfs_inode * ni,enum ATTR_TYPE type,const __le16 * name,u8 name_len,struct runs_tree * run,u64 new_size,const u64 * new_valid,bool keep_prealloc,struct ATTRIB ** ret)402 int attr_set_size(struct ntfs_inode *ni, enum ATTR_TYPE type,
403 const __le16 *name, u8 name_len, struct runs_tree *run,
404 u64 new_size, const u64 *new_valid, bool keep_prealloc,
405 struct ATTRIB **ret)
406 {
407 int err = 0;
408 struct ntfs_sb_info *sbi = ni->mi.sbi;
409 u8 cluster_bits = sbi->cluster_bits;
410 bool is_mft = ni->mi.rno == MFT_REC_MFT && type == ATTR_DATA &&
411 !name_len;
412 u64 old_valid, old_size, old_alloc, new_alloc, new_alloc_tmp;
413 struct ATTRIB *attr = NULL, *attr_b;
414 struct ATTR_LIST_ENTRY *le, *le_b;
415 struct mft_inode *mi, *mi_b;
416 CLST alen, vcn, lcn, new_alen, old_alen, svcn, evcn;
417 CLST next_svcn, pre_alloc = -1, done = 0;
418 bool is_ext, is_bad = false;
419 bool dirty = false;
420 u32 align;
421 struct MFT_REC *rec;
422
423 again:
424 alen = 0;
425 le_b = NULL;
426 attr_b = ni_find_attr(ni, NULL, &le_b, type, name, name_len, NULL,
427 &mi_b);
428 if (!attr_b) {
429 err = -ENOENT;
430 goto bad_inode;
431 }
432
433 if (!attr_b->non_res) {
434 err = attr_set_size_res(ni, attr_b, le_b, mi_b, new_size, run,
435 &attr_b);
436 if (err)
437 return err;
438
439 /* Return if file is still resident. */
440 if (!attr_b->non_res) {
441 dirty = true;
442 goto ok1;
443 }
444
445 /* Layout of records may be changed, so do a full search. */
446 goto again;
447 }
448
449 is_ext = is_attr_ext(attr_b);
450 align = sbi->cluster_size;
451 if (is_ext)
452 align <<= attr_b->nres.c_unit;
453
454 old_valid = le64_to_cpu(attr_b->nres.valid_size);
455 old_size = le64_to_cpu(attr_b->nres.data_size);
456 old_alloc = le64_to_cpu(attr_b->nres.alloc_size);
457
458 again_1:
459 old_alen = old_alloc >> cluster_bits;
460
461 new_alloc = (new_size + align - 1) & ~(u64)(align - 1);
462 new_alen = new_alloc >> cluster_bits;
463
464 if (keep_prealloc && new_size < old_size) {
465 attr_b->nres.data_size = cpu_to_le64(new_size);
466 mi_b->dirty = dirty = true;
467 goto ok;
468 }
469
470 vcn = old_alen - 1;
471
472 svcn = le64_to_cpu(attr_b->nres.svcn);
473 evcn = le64_to_cpu(attr_b->nres.evcn);
474
475 if (svcn <= vcn && vcn <= evcn) {
476 attr = attr_b;
477 le = le_b;
478 mi = mi_b;
479 } else if (!le_b) {
480 err = -EINVAL;
481 goto bad_inode;
482 } else {
483 le = le_b;
484 attr = ni_find_attr(ni, attr_b, &le, type, name, name_len, &vcn,
485 &mi);
486 if (!attr) {
487 err = -EINVAL;
488 goto bad_inode;
489 }
490
491 next_le_1:
492 svcn = le64_to_cpu(attr->nres.svcn);
493 evcn = le64_to_cpu(attr->nres.evcn);
494 }
495 /*
496 * Here we have:
497 * attr,mi,le - last attribute segment (containing 'vcn').
498 * attr_b,mi_b,le_b - base (primary) attribute segment.
499 */
500 next_le:
501 rec = mi->mrec;
502 err = attr_load_runs(attr, ni, run, NULL);
503 if (err)
504 goto out;
505
506 if (new_size > old_size) {
507 CLST to_allocate;
508 size_t free;
509
510 if (new_alloc <= old_alloc) {
511 attr_b->nres.data_size = cpu_to_le64(new_size);
512 mi_b->dirty = dirty = true;
513 goto ok;
514 }
515
516 /*
517 * Add clusters. In simple case we have to:
518 * - allocate space (vcn, lcn, len)
519 * - update packed run in 'mi'
520 * - update attr->nres.evcn
521 * - update attr_b->nres.data_size/attr_b->nres.alloc_size
522 */
523 to_allocate = new_alen - old_alen;
524 add_alloc_in_same_attr_seg:
525 lcn = 0;
526 if (is_mft) {
527 /* MFT allocates clusters from MFT zone. */
528 pre_alloc = 0;
529 } else if (is_ext) {
530 /* No preallocate for sparse/compress. */
531 pre_alloc = 0;
532 } else if (pre_alloc == -1) {
533 pre_alloc = 0;
534 if (type == ATTR_DATA && !name_len &&
535 sbi->options->prealloc) {
536 pre_alloc = bytes_to_cluster(
537 sbi, get_pre_allocated(
538 new_size)) -
539 new_alen;
540 }
541
542 /* Get the last LCN to allocate from. */
543 if (old_alen &&
544 !run_lookup_entry(run, vcn, &lcn, NULL, NULL)) {
545 lcn = SPARSE_LCN;
546 }
547
548 if (lcn == SPARSE_LCN)
549 lcn = 0;
550 else if (lcn)
551 lcn += 1;
552
553 free = wnd_zeroes(&sbi->used.bitmap);
554 if (to_allocate > free) {
555 err = -ENOSPC;
556 goto out;
557 }
558
559 if (pre_alloc && to_allocate + pre_alloc > free)
560 pre_alloc = 0;
561 }
562
563 vcn = old_alen;
564
565 if (is_ext) {
566 if (!run_add_entry(run, vcn, SPARSE_LCN, to_allocate,
567 false)) {
568 err = -ENOMEM;
569 goto out;
570 }
571 alen = to_allocate;
572 } else {
573 /* ~3 bytes per fragment. */
574 err = attr_allocate_clusters(
575 sbi, run, vcn, lcn, to_allocate, &pre_alloc,
576 is_mft ? ALLOCATE_MFT : ALLOCATE_DEF, &alen,
577 is_mft ? 0 :
578 (sbi->record_size -
579 le32_to_cpu(rec->used) + 8) /
580 3 +
581 1,
582 NULL, NULL);
583 if (err)
584 goto out;
585 }
586
587 done += alen;
588 vcn += alen;
589 if (to_allocate > alen)
590 to_allocate -= alen;
591 else
592 to_allocate = 0;
593
594 pack_runs:
595 err = mi_pack_runs(mi, attr, run, vcn - svcn);
596 if (err)
597 goto undo_1;
598
599 next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
600 new_alloc_tmp = (u64)next_svcn << cluster_bits;
601 attr_b->nres.alloc_size = cpu_to_le64(new_alloc_tmp);
602 mi_b->dirty = dirty = true;
603
604 if (next_svcn >= vcn && !to_allocate) {
605 /* Normal way. Update attribute and exit. */
606 attr_b->nres.data_size = cpu_to_le64(new_size);
607 goto ok;
608 }
609
610 /* At least two MFT to avoid recursive loop. */
611 if (is_mft && next_svcn == vcn &&
612 ((u64)done << sbi->cluster_bits) >= 2 * sbi->record_size) {
613 new_size = new_alloc_tmp;
614 attr_b->nres.data_size = attr_b->nres.alloc_size;
615 goto ok;
616 }
617
618 if (le32_to_cpu(rec->used) < sbi->record_size) {
619 old_alen = next_svcn;
620 evcn = old_alen - 1;
621 goto add_alloc_in_same_attr_seg;
622 }
623
624 attr_b->nres.data_size = attr_b->nres.alloc_size;
625 if (new_alloc_tmp < old_valid)
626 attr_b->nres.valid_size = attr_b->nres.data_size;
627
628 if (type == ATTR_LIST) {
629 err = ni_expand_list(ni);
630 if (err)
631 goto undo_2;
632 if (next_svcn < vcn)
633 goto pack_runs;
634
635 /* Layout of records is changed. */
636 goto again;
637 }
638
639 if (!ni->attr_list.size) {
640 err = ni_create_attr_list(ni);
641 /* In case of error layout of records is not changed. */
642 if (err)
643 goto undo_2;
644 /* Layout of records is changed. */
645 }
646
647 if (next_svcn >= vcn) {
648 /* This is MFT data, repeat. */
649 goto again;
650 }
651
652 /* Insert new attribute segment. */
653 err = ni_insert_nonresident(ni, type, name, name_len, run,
654 next_svcn, vcn - next_svcn,
655 attr_b->flags, &attr, &mi, NULL);
656
657 /*
658 * Layout of records maybe changed.
659 * Find base attribute to update.
660 */
661 le_b = NULL;
662 attr_b = ni_find_attr(ni, NULL, &le_b, type, name, name_len,
663 NULL, &mi_b);
664 if (!attr_b) {
665 err = -EINVAL;
666 goto bad_inode;
667 }
668
669 if (err) {
670 /* ni_insert_nonresident failed. */
671 attr = NULL;
672 goto undo_2;
673 }
674
675 /* keep runs for $MFT::$ATTR_DATA and $MFT::$ATTR_BITMAP. */
676 if (ni->mi.rno != MFT_REC_MFT)
677 run_truncate_head(run, evcn + 1);
678
679 svcn = le64_to_cpu(attr->nres.svcn);
680 evcn = le64_to_cpu(attr->nres.evcn);
681
682 /*
683 * Attribute is in consistency state.
684 * Save this point to restore to if next steps fail.
685 */
686 old_valid = old_size = old_alloc = (u64)vcn << cluster_bits;
687 attr_b->nres.valid_size = attr_b->nres.data_size =
688 attr_b->nres.alloc_size = cpu_to_le64(old_size);
689 mi_b->dirty = dirty = true;
690 goto again_1;
691 }
692
693 if (new_size != old_size ||
694 (new_alloc != old_alloc && !keep_prealloc)) {
695 /*
696 * Truncate clusters. In simple case we have to:
697 * - update packed run in 'mi'
698 * - update attr->nres.evcn
699 * - update attr_b->nres.data_size/attr_b->nres.alloc_size
700 * - mark and trim clusters as free (vcn, lcn, len)
701 */
702 CLST dlen = 0;
703
704 vcn = max(svcn, new_alen);
705 new_alloc_tmp = (u64)vcn << cluster_bits;
706
707 if (vcn > svcn) {
708 err = mi_pack_runs(mi, attr, run, vcn - svcn);
709 if (err)
710 goto out;
711 } else if (le && le->vcn) {
712 u16 le_sz = le16_to_cpu(le->size);
713
714 /*
715 * NOTE: List entries for one attribute are always
716 * the same size. We deal with last entry (vcn==0)
717 * and it is not first in entries array
718 * (list entry for std attribute always first).
719 * So it is safe to step back.
720 */
721 mi_remove_attr(NULL, mi, attr);
722
723 if (!al_remove_le(ni, le)) {
724 err = -EINVAL;
725 goto bad_inode;
726 }
727
728 le = (struct ATTR_LIST_ENTRY *)((u8 *)le - le_sz);
729 } else {
730 attr->nres.evcn = cpu_to_le64((u64)vcn - 1);
731 mi->dirty = true;
732 }
733
734 attr_b->nres.alloc_size = cpu_to_le64(new_alloc_tmp);
735
736 if (vcn == new_alen) {
737 attr_b->nres.data_size = cpu_to_le64(new_size);
738 if (new_size < old_valid)
739 attr_b->nres.valid_size =
740 attr_b->nres.data_size;
741 } else {
742 if (new_alloc_tmp <=
743 le64_to_cpu(attr_b->nres.data_size))
744 attr_b->nres.data_size =
745 attr_b->nres.alloc_size;
746 if (new_alloc_tmp <
747 le64_to_cpu(attr_b->nres.valid_size))
748 attr_b->nres.valid_size =
749 attr_b->nres.alloc_size;
750 }
751 mi_b->dirty = dirty = true;
752
753 err = run_deallocate_ex(sbi, run, vcn, evcn - vcn + 1, &dlen,
754 true);
755 if (err)
756 goto out;
757
758 if (is_ext) {
759 /* dlen - really deallocated clusters. */
760 le64_sub_cpu(&attr_b->nres.total_size,
761 ((u64)dlen << cluster_bits));
762 }
763
764 run_truncate(run, vcn);
765
766 if (new_alloc_tmp <= new_alloc)
767 goto ok;
768
769 old_size = new_alloc_tmp;
770 vcn = svcn - 1;
771
772 if (le == le_b) {
773 attr = attr_b;
774 mi = mi_b;
775 evcn = svcn - 1;
776 svcn = 0;
777 goto next_le;
778 }
779
780 if (le->type != type || le->name_len != name_len ||
781 memcmp(le_name(le), name, name_len * sizeof(short))) {
782 err = -EINVAL;
783 goto bad_inode;
784 }
785
786 err = ni_load_mi(ni, le, &mi);
787 if (err)
788 goto out;
789
790 attr = mi_find_attr(mi, NULL, type, name, name_len, &le->id);
791 if (!attr) {
792 err = -EINVAL;
793 goto bad_inode;
794 }
795 goto next_le_1;
796 }
797
798 ok:
799 if (new_valid) {
800 __le64 valid = cpu_to_le64(min(*new_valid, new_size));
801
802 if (attr_b->nres.valid_size != valid) {
803 attr_b->nres.valid_size = valid;
804 mi_b->dirty = true;
805 }
806 }
807
808 ok1:
809 if (ret)
810 *ret = attr_b;
811
812 if (((type == ATTR_DATA && !name_len) ||
813 (type == ATTR_ALLOC && name == I30_NAME))) {
814 /* Update inode_set_bytes. */
815 if (attr_b->non_res) {
816 new_alloc = le64_to_cpu(attr_b->nres.alloc_size);
817 if (inode_get_bytes(&ni->vfs_inode) != new_alloc) {
818 inode_set_bytes(&ni->vfs_inode, new_alloc);
819 dirty = true;
820 }
821 }
822
823 /* Don't forget to update duplicate information in parent. */
824 if (dirty) {
825 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
826 mark_inode_dirty(&ni->vfs_inode);
827 }
828 }
829
830 return 0;
831
832 undo_2:
833 vcn -= alen;
834 attr_b->nres.data_size = cpu_to_le64(old_size);
835 attr_b->nres.valid_size = cpu_to_le64(old_valid);
836 attr_b->nres.alloc_size = cpu_to_le64(old_alloc);
837
838 /* Restore 'attr' and 'mi'. */
839 if (attr)
840 goto restore_run;
841
842 if (le64_to_cpu(attr_b->nres.svcn) <= svcn &&
843 svcn <= le64_to_cpu(attr_b->nres.evcn)) {
844 attr = attr_b;
845 le = le_b;
846 mi = mi_b;
847 } else if (!le_b) {
848 err = -EINVAL;
849 goto bad_inode;
850 } else {
851 le = le_b;
852 attr = ni_find_attr(ni, attr_b, &le, type, name, name_len,
853 &svcn, &mi);
854 if (!attr)
855 goto bad_inode;
856 }
857
858 restore_run:
859 if (mi_pack_runs(mi, attr, run, evcn - svcn + 1))
860 is_bad = true;
861
862 undo_1:
863 run_deallocate_ex(sbi, run, vcn, alen, NULL, false);
864
865 run_truncate(run, vcn);
866 out:
867 if (is_bad) {
868 bad_inode:
869 _ntfs_bad_inode(&ni->vfs_inode);
870 }
871 return err;
872 }
873
874 /*
875 * attr_data_get_block - Returns 'lcn' and 'len' for given 'vcn'.
876 *
877 * @new == NULL means just to get current mapping for 'vcn'
878 * @new != NULL means allocate real cluster if 'vcn' maps to hole
879 * @zero - zeroout new allocated clusters
880 *
881 * NOTE:
882 * - @new != NULL is called only for sparsed or compressed attributes.
883 * - new allocated clusters are zeroed via blkdev_issue_zeroout.
884 */
attr_data_get_block(struct ntfs_inode * ni,CLST vcn,CLST clen,CLST * lcn,CLST * len,bool * new,bool zero)885 int attr_data_get_block(struct ntfs_inode *ni, CLST vcn, CLST clen, CLST *lcn,
886 CLST *len, bool *new, bool zero)
887 {
888 int err = 0;
889 struct runs_tree *run = &ni->file.run;
890 struct ntfs_sb_info *sbi;
891 u8 cluster_bits;
892 struct ATTRIB *attr, *attr_b;
893 struct ATTR_LIST_ENTRY *le, *le_b;
894 struct mft_inode *mi, *mi_b;
895 CLST hint, svcn, to_alloc, evcn1, next_svcn, asize, end, vcn0, alen;
896 CLST alloc, evcn;
897 unsigned fr;
898 u64 total_size, total_size0;
899 int step = 0;
900
901 if (new)
902 *new = false;
903
904 /* Try to find in cache. */
905 down_read(&ni->file.run_lock);
906 if (!run_lookup_entry(run, vcn, lcn, len, NULL))
907 *len = 0;
908 up_read(&ni->file.run_lock);
909
910 if (*len && (*lcn != SPARSE_LCN || !new))
911 return 0; /* Fast normal way without allocation. */
912
913 /* No cluster in cache or we need to allocate cluster in hole. */
914 sbi = ni->mi.sbi;
915 cluster_bits = sbi->cluster_bits;
916
917 ni_lock(ni);
918 down_write(&ni->file.run_lock);
919
920 /* Repeat the code above (under write lock). */
921 if (!run_lookup_entry(run, vcn, lcn, len, NULL))
922 *len = 0;
923
924 if (*len) {
925 if (*lcn != SPARSE_LCN || !new)
926 goto out; /* normal way without allocation. */
927 if (clen > *len)
928 clen = *len;
929 }
930
931 le_b = NULL;
932 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b);
933 if (!attr_b) {
934 err = -ENOENT;
935 goto out;
936 }
937
938 if (!attr_b->non_res) {
939 *lcn = RESIDENT_LCN;
940 *len = 1;
941 goto out;
942 }
943
944 asize = le64_to_cpu(attr_b->nres.alloc_size) >> cluster_bits;
945 if (vcn >= asize) {
946 if (new) {
947 err = -EINVAL;
948 } else {
949 *len = 1;
950 *lcn = SPARSE_LCN;
951 }
952 goto out;
953 }
954
955 svcn = le64_to_cpu(attr_b->nres.svcn);
956 evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1;
957
958 attr = attr_b;
959 le = le_b;
960 mi = mi_b;
961
962 if (le_b && (vcn < svcn || evcn1 <= vcn)) {
963 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
964 &mi);
965 if (!attr) {
966 err = -EINVAL;
967 goto out;
968 }
969 svcn = le64_to_cpu(attr->nres.svcn);
970 evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
971 }
972
973 /* Load in cache actual information. */
974 err = attr_load_runs(attr, ni, run, NULL);
975 if (err)
976 goto out;
977
978 /* Check for compressed frame. */
979 err = attr_is_frame_compressed(ni, attr, vcn >> NTFS_LZNT_CUNIT, &hint);
980 if (err)
981 goto out;
982
983 if (hint) {
984 /* if frame is compressed - don't touch it. */
985 *lcn = COMPRESSED_LCN;
986 *len = hint;
987 err = -EOPNOTSUPP;
988 goto out;
989 }
990
991 if (!*len) {
992 if (run_lookup_entry(run, vcn, lcn, len, NULL)) {
993 if (*lcn != SPARSE_LCN || !new)
994 goto ok; /* Slow normal way without allocation. */
995
996 if (clen > *len)
997 clen = *len;
998 } else if (!new) {
999 /* Here we may return -ENOENT.
1000 * In any case caller gets zero length. */
1001 goto ok;
1002 }
1003 }
1004
1005 if (!is_attr_ext(attr_b)) {
1006 /* The code below only for sparsed or compressed attributes. */
1007 err = -EINVAL;
1008 goto out;
1009 }
1010
1011 vcn0 = vcn;
1012 to_alloc = clen;
1013 fr = (sbi->record_size - le32_to_cpu(mi->mrec->used) + 8) / 3 + 1;
1014 /* Allocate frame aligned clusters.
1015 * ntfs.sys usually uses 16 clusters per frame for sparsed or compressed.
1016 * ntfs3 uses 1 cluster per frame for new created sparsed files. */
1017 if (attr_b->nres.c_unit) {
1018 CLST clst_per_frame = 1u << attr_b->nres.c_unit;
1019 CLST cmask = ~(clst_per_frame - 1);
1020
1021 /* Get frame aligned vcn and to_alloc. */
1022 vcn = vcn0 & cmask;
1023 to_alloc = ((vcn0 + clen + clst_per_frame - 1) & cmask) - vcn;
1024 if (fr < clst_per_frame)
1025 fr = clst_per_frame;
1026 zero = true;
1027
1028 /* Check if 'vcn' and 'vcn0' in different attribute segments. */
1029 if (vcn < svcn || evcn1 <= vcn) {
1030 /* Load attribute for truncated vcn. */
1031 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0,
1032 &vcn, &mi);
1033 if (!attr) {
1034 err = -EINVAL;
1035 goto out;
1036 }
1037 svcn = le64_to_cpu(attr->nres.svcn);
1038 evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
1039 err = attr_load_runs(attr, ni, run, NULL);
1040 if (err)
1041 goto out;
1042 }
1043 }
1044
1045 if (vcn + to_alloc > asize)
1046 to_alloc = asize - vcn;
1047
1048 /* Get the last LCN to allocate from. */
1049 hint = 0;
1050
1051 if (vcn > evcn1) {
1052 if (!run_add_entry(run, evcn1, SPARSE_LCN, vcn - evcn1,
1053 false)) {
1054 err = -ENOMEM;
1055 goto out;
1056 }
1057 } else if (vcn && !run_lookup_entry(run, vcn - 1, &hint, NULL, NULL)) {
1058 hint = -1;
1059 }
1060
1061 /* Allocate and zeroout new clusters. */
1062 err = attr_allocate_clusters(sbi, run, vcn, hint + 1, to_alloc, NULL,
1063 zero ? ALLOCATE_ZERO : ALLOCATE_DEF, &alen,
1064 fr, lcn, len);
1065 if (err)
1066 goto out;
1067 *new = true;
1068 step = 1;
1069
1070 end = vcn + alen;
1071 /* Save 'total_size0' to restore if error. */
1072 total_size0 = le64_to_cpu(attr_b->nres.total_size);
1073 total_size = total_size0 + ((u64)alen << cluster_bits);
1074
1075 if (vcn != vcn0) {
1076 if (!run_lookup_entry(run, vcn0, lcn, len, NULL)) {
1077 err = -EINVAL;
1078 goto out;
1079 }
1080 if (*lcn == SPARSE_LCN) {
1081 /* Internal error. Should not happened. */
1082 WARN_ON(1);
1083 err = -EINVAL;
1084 goto out;
1085 }
1086 /* Check case when vcn0 + len overlaps new allocated clusters. */
1087 if (vcn0 + *len > end)
1088 *len = end - vcn0;
1089 }
1090
1091 repack:
1092 err = mi_pack_runs(mi, attr, run, max(end, evcn1) - svcn);
1093 if (err)
1094 goto out;
1095
1096 attr_b->nres.total_size = cpu_to_le64(total_size);
1097 inode_set_bytes(&ni->vfs_inode, total_size);
1098 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
1099
1100 mi_b->dirty = true;
1101 mark_inode_dirty(&ni->vfs_inode);
1102
1103 /* Stored [vcn : next_svcn) from [vcn : end). */
1104 next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
1105
1106 if (end <= evcn1) {
1107 if (next_svcn == evcn1) {
1108 /* Normal way. Update attribute and exit. */
1109 goto ok;
1110 }
1111 /* Add new segment [next_svcn : evcn1 - next_svcn). */
1112 if (!ni->attr_list.size) {
1113 err = ni_create_attr_list(ni);
1114 if (err)
1115 goto undo1;
1116 /* Layout of records is changed. */
1117 le_b = NULL;
1118 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL,
1119 0, NULL, &mi_b);
1120 if (!attr_b) {
1121 err = -ENOENT;
1122 goto out;
1123 }
1124
1125 attr = attr_b;
1126 le = le_b;
1127 mi = mi_b;
1128 goto repack;
1129 }
1130 }
1131
1132 /*
1133 * The code below may require additional cluster (to extend attribute list)
1134 * and / or one MFT record
1135 * It is too complex to undo operations if -ENOSPC occurs deep inside
1136 * in 'ni_insert_nonresident'.
1137 * Return in advance -ENOSPC here if there are no free cluster and no free MFT.
1138 */
1139 if (!ntfs_check_for_free_space(sbi, 1, 1)) {
1140 /* Undo step 1. */
1141 err = -ENOSPC;
1142 goto undo1;
1143 }
1144
1145 step = 2;
1146 svcn = evcn1;
1147
1148 /* Estimate next attribute. */
1149 attr = ni_find_attr(ni, attr, &le, ATTR_DATA, NULL, 0, &svcn, &mi);
1150
1151 if (!attr) {
1152 /* Insert new attribute segment. */
1153 goto ins_ext;
1154 }
1155
1156 /* Try to update existed attribute segment. */
1157 alloc = bytes_to_cluster(sbi, le64_to_cpu(attr_b->nres.alloc_size));
1158 evcn = le64_to_cpu(attr->nres.evcn);
1159
1160 if (end < next_svcn)
1161 end = next_svcn;
1162 while (end > evcn) {
1163 /* Remove segment [svcn : evcn). */
1164 mi_remove_attr(NULL, mi, attr);
1165
1166 if (!al_remove_le(ni, le)) {
1167 err = -EINVAL;
1168 goto out;
1169 }
1170
1171 if (evcn + 1 >= alloc) {
1172 /* Last attribute segment. */
1173 evcn1 = evcn + 1;
1174 goto ins_ext;
1175 }
1176
1177 if (ni_load_mi(ni, le, &mi)) {
1178 attr = NULL;
1179 goto out;
1180 }
1181
1182 attr = mi_find_attr(mi, NULL, ATTR_DATA, NULL, 0, &le->id);
1183 if (!attr) {
1184 err = -EINVAL;
1185 goto out;
1186 }
1187 svcn = le64_to_cpu(attr->nres.svcn);
1188 evcn = le64_to_cpu(attr->nres.evcn);
1189 }
1190
1191 if (end < svcn)
1192 end = svcn;
1193
1194 err = attr_load_runs(attr, ni, run, &end);
1195 if (err)
1196 goto out;
1197
1198 evcn1 = evcn + 1;
1199 attr->nres.svcn = cpu_to_le64(next_svcn);
1200 err = mi_pack_runs(mi, attr, run, evcn1 - next_svcn);
1201 if (err)
1202 goto out;
1203
1204 le->vcn = cpu_to_le64(next_svcn);
1205 ni->attr_list.dirty = true;
1206 mi->dirty = true;
1207 next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
1208
1209 ins_ext:
1210 if (evcn1 > next_svcn) {
1211 err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run,
1212 next_svcn, evcn1 - next_svcn,
1213 attr_b->flags, &attr, &mi, NULL);
1214 if (err)
1215 goto out;
1216 }
1217 ok:
1218 run_truncate_around(run, vcn);
1219 out:
1220 if (err && step > 1) {
1221 /* Too complex to restore. */
1222 _ntfs_bad_inode(&ni->vfs_inode);
1223 }
1224 up_write(&ni->file.run_lock);
1225 ni_unlock(ni);
1226
1227 return err;
1228
1229 undo1:
1230 /* Undo step1. */
1231 attr_b->nres.total_size = cpu_to_le64(total_size0);
1232 inode_set_bytes(&ni->vfs_inode, total_size0);
1233
1234 if (run_deallocate_ex(sbi, run, vcn, alen, NULL, false) ||
1235 !run_add_entry(run, vcn, SPARSE_LCN, alen, false) ||
1236 mi_pack_runs(mi, attr, run, max(end, evcn1) - svcn)) {
1237 _ntfs_bad_inode(&ni->vfs_inode);
1238 }
1239 goto out;
1240 }
1241
attr_data_read_resident(struct ntfs_inode * ni,struct folio * folio)1242 int attr_data_read_resident(struct ntfs_inode *ni, struct folio *folio)
1243 {
1244 u64 vbo;
1245 struct ATTRIB *attr;
1246 u32 data_size;
1247 size_t len;
1248
1249 attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL, NULL);
1250 if (!attr)
1251 return -EINVAL;
1252
1253 if (attr->non_res)
1254 return E_NTFS_NONRESIDENT;
1255
1256 vbo = folio->index << PAGE_SHIFT;
1257 data_size = le32_to_cpu(attr->res.data_size);
1258 if (vbo > data_size)
1259 len = 0;
1260 else
1261 len = min(data_size - vbo, folio_size(folio));
1262
1263 folio_fill_tail(folio, 0, resident_data(attr) + vbo, len);
1264 folio_mark_uptodate(folio);
1265
1266 return 0;
1267 }
1268
attr_data_write_resident(struct ntfs_inode * ni,struct folio * folio)1269 int attr_data_write_resident(struct ntfs_inode *ni, struct folio *folio)
1270 {
1271 u64 vbo;
1272 struct mft_inode *mi;
1273 struct ATTRIB *attr;
1274 u32 data_size;
1275
1276 attr = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL, &mi);
1277 if (!attr)
1278 return -EINVAL;
1279
1280 if (attr->non_res) {
1281 /* Return special error code to check this case. */
1282 return E_NTFS_NONRESIDENT;
1283 }
1284
1285 vbo = folio->index << PAGE_SHIFT;
1286 data_size = le32_to_cpu(attr->res.data_size);
1287 if (vbo < data_size) {
1288 char *data = resident_data(attr);
1289 size_t len = min(data_size - vbo, folio_size(folio));
1290
1291 memcpy_from_folio(data + vbo, folio, 0, len);
1292 mi->dirty = true;
1293 }
1294 ni->i_valid = data_size;
1295
1296 return 0;
1297 }
1298
1299 /*
1300 * attr_load_runs_vcn - Load runs with VCN.
1301 */
attr_load_runs_vcn(struct ntfs_inode * ni,enum ATTR_TYPE type,const __le16 * name,u8 name_len,struct runs_tree * run,CLST vcn)1302 int attr_load_runs_vcn(struct ntfs_inode *ni, enum ATTR_TYPE type,
1303 const __le16 *name, u8 name_len, struct runs_tree *run,
1304 CLST vcn)
1305 {
1306 struct ATTRIB *attr;
1307 int err;
1308 CLST svcn, evcn;
1309 u16 ro;
1310
1311 if (!ni) {
1312 /* Is record corrupted? */
1313 return -ENOENT;
1314 }
1315
1316 attr = ni_find_attr(ni, NULL, NULL, type, name, name_len, &vcn, NULL);
1317 if (!attr) {
1318 /* Is record corrupted? */
1319 return -ENOENT;
1320 }
1321
1322 svcn = le64_to_cpu(attr->nres.svcn);
1323 evcn = le64_to_cpu(attr->nres.evcn);
1324
1325 if (evcn < vcn || vcn < svcn) {
1326 /* Is record corrupted? */
1327 return -EINVAL;
1328 }
1329
1330 ro = le16_to_cpu(attr->nres.run_off);
1331
1332 if (ro > le32_to_cpu(attr->size))
1333 return -EINVAL;
1334
1335 err = run_unpack_ex(run, ni->mi.sbi, ni->mi.rno, svcn, evcn, svcn,
1336 Add2Ptr(attr, ro), le32_to_cpu(attr->size) - ro);
1337 if (err < 0)
1338 return err;
1339 return 0;
1340 }
1341
1342 /*
1343 * attr_load_runs_range - Load runs for given range [from to).
1344 */
attr_load_runs_range(struct ntfs_inode * ni,enum ATTR_TYPE type,const __le16 * name,u8 name_len,struct runs_tree * run,u64 from,u64 to)1345 int attr_load_runs_range(struct ntfs_inode *ni, enum ATTR_TYPE type,
1346 const __le16 *name, u8 name_len, struct runs_tree *run,
1347 u64 from, u64 to)
1348 {
1349 struct ntfs_sb_info *sbi = ni->mi.sbi;
1350 u8 cluster_bits = sbi->cluster_bits;
1351 CLST vcn;
1352 CLST vcn_last = (to - 1) >> cluster_bits;
1353 CLST lcn, clen;
1354 int err;
1355
1356 for (vcn = from >> cluster_bits; vcn <= vcn_last; vcn += clen) {
1357 if (!run_lookup_entry(run, vcn, &lcn, &clen, NULL)) {
1358 err = attr_load_runs_vcn(ni, type, name, name_len, run,
1359 vcn);
1360 if (err)
1361 return err;
1362 clen = 0; /* Next run_lookup_entry(vcn) must be success. */
1363 }
1364 }
1365
1366 return 0;
1367 }
1368
1369 #ifdef CONFIG_NTFS3_LZX_XPRESS
1370 /*
1371 * attr_wof_frame_info
1372 *
1373 * Read header of Xpress/LZX file to get info about frame.
1374 */
attr_wof_frame_info(struct ntfs_inode * ni,struct ATTRIB * attr,struct runs_tree * run,u64 frame,u64 frames,u8 frame_bits,u32 * ondisk_size,u64 * vbo_data)1375 int attr_wof_frame_info(struct ntfs_inode *ni, struct ATTRIB *attr,
1376 struct runs_tree *run, u64 frame, u64 frames,
1377 u8 frame_bits, u32 *ondisk_size, u64 *vbo_data)
1378 {
1379 struct ntfs_sb_info *sbi = ni->mi.sbi;
1380 u64 vbo[2], off[2], wof_size;
1381 u32 voff;
1382 u8 bytes_per_off;
1383 char *addr;
1384 struct folio *folio;
1385 int i, err;
1386 __le32 *off32;
1387 __le64 *off64;
1388
1389 if (ni->vfs_inode.i_size < 0x100000000ull) {
1390 /* File starts with array of 32 bit offsets. */
1391 bytes_per_off = sizeof(__le32);
1392 vbo[1] = frame << 2;
1393 *vbo_data = frames << 2;
1394 } else {
1395 /* File starts with array of 64 bit offsets. */
1396 bytes_per_off = sizeof(__le64);
1397 vbo[1] = frame << 3;
1398 *vbo_data = frames << 3;
1399 }
1400
1401 /*
1402 * Read 4/8 bytes at [vbo - 4(8)] == offset where compressed frame starts.
1403 * Read 4/8 bytes at [vbo] == offset where compressed frame ends.
1404 */
1405 if (!attr->non_res) {
1406 if (vbo[1] + bytes_per_off > le32_to_cpu(attr->res.data_size)) {
1407 ntfs_inode_err(&ni->vfs_inode, "is corrupted");
1408 return -EINVAL;
1409 }
1410 addr = resident_data(attr);
1411
1412 if (bytes_per_off == sizeof(__le32)) {
1413 off32 = Add2Ptr(addr, vbo[1]);
1414 off[0] = vbo[1] ? le32_to_cpu(off32[-1]) : 0;
1415 off[1] = le32_to_cpu(off32[0]);
1416 } else {
1417 off64 = Add2Ptr(addr, vbo[1]);
1418 off[0] = vbo[1] ? le64_to_cpu(off64[-1]) : 0;
1419 off[1] = le64_to_cpu(off64[0]);
1420 }
1421
1422 *vbo_data += off[0];
1423 *ondisk_size = off[1] - off[0];
1424 return 0;
1425 }
1426
1427 wof_size = le64_to_cpu(attr->nres.data_size);
1428 down_write(&ni->file.run_lock);
1429 folio = ni->file.offs_folio;
1430 if (!folio) {
1431 folio = folio_alloc(GFP_KERNEL, 0);
1432 if (!folio) {
1433 err = -ENOMEM;
1434 goto out;
1435 }
1436 folio->index = -1;
1437 ni->file.offs_folio = folio;
1438 }
1439 folio_lock(folio);
1440 addr = folio_address(folio);
1441
1442 if (vbo[1]) {
1443 voff = vbo[1] & (PAGE_SIZE - 1);
1444 vbo[0] = vbo[1] - bytes_per_off;
1445 i = 0;
1446 } else {
1447 voff = 0;
1448 vbo[0] = 0;
1449 off[0] = 0;
1450 i = 1;
1451 }
1452
1453 do {
1454 pgoff_t index = vbo[i] >> PAGE_SHIFT;
1455
1456 if (index != folio->index) {
1457 struct page *page = &folio->page;
1458 u64 from = vbo[i] & ~(u64)(PAGE_SIZE - 1);
1459 u64 to = min(from + PAGE_SIZE, wof_size);
1460
1461 err = attr_load_runs_range(ni, ATTR_DATA, WOF_NAME,
1462 ARRAY_SIZE(WOF_NAME), run,
1463 from, to);
1464 if (err)
1465 goto out1;
1466
1467 err = ntfs_bio_pages(sbi, run, &page, 1, from,
1468 to - from, REQ_OP_READ);
1469 if (err) {
1470 folio->index = -1;
1471 goto out1;
1472 }
1473 folio->index = index;
1474 }
1475
1476 if (i) {
1477 if (bytes_per_off == sizeof(__le32)) {
1478 off32 = Add2Ptr(addr, voff);
1479 off[1] = le32_to_cpu(*off32);
1480 } else {
1481 off64 = Add2Ptr(addr, voff);
1482 off[1] = le64_to_cpu(*off64);
1483 }
1484 } else if (!voff) {
1485 if (bytes_per_off == sizeof(__le32)) {
1486 off32 = Add2Ptr(addr, PAGE_SIZE - sizeof(u32));
1487 off[0] = le32_to_cpu(*off32);
1488 } else {
1489 off64 = Add2Ptr(addr, PAGE_SIZE - sizeof(u64));
1490 off[0] = le64_to_cpu(*off64);
1491 }
1492 } else {
1493 /* Two values in one page. */
1494 if (bytes_per_off == sizeof(__le32)) {
1495 off32 = Add2Ptr(addr, voff);
1496 off[0] = le32_to_cpu(off32[-1]);
1497 off[1] = le32_to_cpu(off32[0]);
1498 } else {
1499 off64 = Add2Ptr(addr, voff);
1500 off[0] = le64_to_cpu(off64[-1]);
1501 off[1] = le64_to_cpu(off64[0]);
1502 }
1503 break;
1504 }
1505 } while (++i < 2);
1506
1507 *vbo_data += off[0];
1508 *ondisk_size = off[1] - off[0];
1509
1510 out1:
1511 folio_unlock(folio);
1512 out:
1513 up_write(&ni->file.run_lock);
1514 return err;
1515 }
1516 #endif
1517
1518 /*
1519 * attr_is_frame_compressed - Used to detect compressed frame.
1520 */
attr_is_frame_compressed(struct ntfs_inode * ni,struct ATTRIB * attr,CLST frame,CLST * clst_data)1521 int attr_is_frame_compressed(struct ntfs_inode *ni, struct ATTRIB *attr,
1522 CLST frame, CLST *clst_data)
1523 {
1524 int err;
1525 u32 clst_frame;
1526 CLST clen, lcn, vcn, alen, slen, vcn_next;
1527 size_t idx;
1528 struct runs_tree *run;
1529
1530 *clst_data = 0;
1531
1532 if (!is_attr_compressed(attr))
1533 return 0;
1534
1535 if (!attr->non_res)
1536 return 0;
1537
1538 clst_frame = 1u << attr->nres.c_unit;
1539 vcn = frame * clst_frame;
1540 run = &ni->file.run;
1541
1542 if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx)) {
1543 err = attr_load_runs_vcn(ni, attr->type, attr_name(attr),
1544 attr->name_len, run, vcn);
1545 if (err)
1546 return err;
1547
1548 if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx))
1549 return -EINVAL;
1550 }
1551
1552 if (lcn == SPARSE_LCN) {
1553 /* Sparsed frame. */
1554 return 0;
1555 }
1556
1557 if (clen >= clst_frame) {
1558 /*
1559 * The frame is not compressed 'cause
1560 * it does not contain any sparse clusters.
1561 */
1562 *clst_data = clst_frame;
1563 return 0;
1564 }
1565
1566 alen = bytes_to_cluster(ni->mi.sbi, le64_to_cpu(attr->nres.alloc_size));
1567 slen = 0;
1568 *clst_data = clen;
1569
1570 /*
1571 * The frame is compressed if *clst_data + slen >= clst_frame.
1572 * Check next fragments.
1573 */
1574 while ((vcn += clen) < alen) {
1575 vcn_next = vcn;
1576
1577 if (!run_get_entry(run, ++idx, &vcn, &lcn, &clen) ||
1578 vcn_next != vcn) {
1579 err = attr_load_runs_vcn(ni, attr->type,
1580 attr_name(attr),
1581 attr->name_len, run, vcn_next);
1582 if (err)
1583 return err;
1584 vcn = vcn_next;
1585
1586 if (!run_lookup_entry(run, vcn, &lcn, &clen, &idx))
1587 return -EINVAL;
1588 }
1589
1590 if (lcn == SPARSE_LCN) {
1591 slen += clen;
1592 } else {
1593 if (slen) {
1594 /*
1595 * Data_clusters + sparse_clusters =
1596 * not enough for frame.
1597 */
1598 return -EINVAL;
1599 }
1600 *clst_data += clen;
1601 }
1602
1603 if (*clst_data + slen >= clst_frame) {
1604 if (!slen) {
1605 /*
1606 * There is no sparsed clusters in this frame
1607 * so it is not compressed.
1608 */
1609 *clst_data = clst_frame;
1610 } else {
1611 /* Frame is compressed. */
1612 }
1613 break;
1614 }
1615 }
1616
1617 return 0;
1618 }
1619
1620 /*
1621 * attr_allocate_frame - Allocate/free clusters for @frame.
1622 *
1623 * Assumed: down_write(&ni->file.run_lock);
1624 */
attr_allocate_frame(struct ntfs_inode * ni,CLST frame,size_t compr_size,u64 new_valid)1625 int attr_allocate_frame(struct ntfs_inode *ni, CLST frame, size_t compr_size,
1626 u64 new_valid)
1627 {
1628 int err = 0;
1629 struct runs_tree *run = &ni->file.run;
1630 struct ntfs_sb_info *sbi = ni->mi.sbi;
1631 struct ATTRIB *attr = NULL, *attr_b;
1632 struct ATTR_LIST_ENTRY *le, *le_b;
1633 struct mft_inode *mi, *mi_b;
1634 CLST svcn, evcn1, next_svcn, len;
1635 CLST vcn, end, clst_data;
1636 u64 total_size, valid_size, data_size;
1637
1638 le_b = NULL;
1639 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b);
1640 if (!attr_b)
1641 return -ENOENT;
1642
1643 if (!is_attr_ext(attr_b))
1644 return -EINVAL;
1645
1646 vcn = frame << NTFS_LZNT_CUNIT;
1647 total_size = le64_to_cpu(attr_b->nres.total_size);
1648
1649 svcn = le64_to_cpu(attr_b->nres.svcn);
1650 evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1;
1651 data_size = le64_to_cpu(attr_b->nres.data_size);
1652
1653 if (svcn <= vcn && vcn < evcn1) {
1654 attr = attr_b;
1655 le = le_b;
1656 mi = mi_b;
1657 } else if (!le_b) {
1658 err = -EINVAL;
1659 goto out;
1660 } else {
1661 le = le_b;
1662 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
1663 &mi);
1664 if (!attr) {
1665 err = -EINVAL;
1666 goto out;
1667 }
1668 svcn = le64_to_cpu(attr->nres.svcn);
1669 evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
1670 }
1671
1672 err = attr_load_runs(attr, ni, run, NULL);
1673 if (err)
1674 goto out;
1675
1676 err = attr_is_frame_compressed(ni, attr_b, frame, &clst_data);
1677 if (err)
1678 goto out;
1679
1680 total_size -= (u64)clst_data << sbi->cluster_bits;
1681
1682 len = bytes_to_cluster(sbi, compr_size);
1683
1684 if (len == clst_data)
1685 goto out;
1686
1687 if (len < clst_data) {
1688 err = run_deallocate_ex(sbi, run, vcn + len, clst_data - len,
1689 NULL, true);
1690 if (err)
1691 goto out;
1692
1693 if (!run_add_entry(run, vcn + len, SPARSE_LCN, clst_data - len,
1694 false)) {
1695 err = -ENOMEM;
1696 goto out;
1697 }
1698 end = vcn + clst_data;
1699 /* Run contains updated range [vcn + len : end). */
1700 } else {
1701 CLST alen, hint = 0;
1702 /* Get the last LCN to allocate from. */
1703 if (vcn + clst_data &&
1704 !run_lookup_entry(run, vcn + clst_data - 1, &hint, NULL,
1705 NULL)) {
1706 hint = -1;
1707 }
1708
1709 err = attr_allocate_clusters(sbi, run, vcn + clst_data,
1710 hint + 1, len - clst_data, NULL,
1711 ALLOCATE_DEF, &alen, 0, NULL,
1712 NULL);
1713 if (err)
1714 goto out;
1715
1716 end = vcn + len;
1717 /* Run contains updated range [vcn + clst_data : end). */
1718 }
1719
1720 total_size += (u64)len << sbi->cluster_bits;
1721
1722 repack:
1723 err = mi_pack_runs(mi, attr, run, max(end, evcn1) - svcn);
1724 if (err)
1725 goto out;
1726
1727 attr_b->nres.total_size = cpu_to_le64(total_size);
1728 inode_set_bytes(&ni->vfs_inode, total_size);
1729 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
1730
1731 mi_b->dirty = true;
1732 mark_inode_dirty(&ni->vfs_inode);
1733
1734 /* Stored [vcn : next_svcn) from [vcn : end). */
1735 next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
1736
1737 if (end <= evcn1) {
1738 if (next_svcn == evcn1) {
1739 /* Normal way. Update attribute and exit. */
1740 goto ok;
1741 }
1742 /* Add new segment [next_svcn : evcn1 - next_svcn). */
1743 if (!ni->attr_list.size) {
1744 err = ni_create_attr_list(ni);
1745 if (err)
1746 goto out;
1747 /* Layout of records is changed. */
1748 le_b = NULL;
1749 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL,
1750 0, NULL, &mi_b);
1751 if (!attr_b) {
1752 err = -ENOENT;
1753 goto out;
1754 }
1755
1756 attr = attr_b;
1757 le = le_b;
1758 mi = mi_b;
1759 goto repack;
1760 }
1761 }
1762
1763 svcn = evcn1;
1764
1765 /* Estimate next attribute. */
1766 attr = ni_find_attr(ni, attr, &le, ATTR_DATA, NULL, 0, &svcn, &mi);
1767
1768 if (attr) {
1769 CLST alloc = bytes_to_cluster(
1770 sbi, le64_to_cpu(attr_b->nres.alloc_size));
1771 CLST evcn = le64_to_cpu(attr->nres.evcn);
1772
1773 if (end < next_svcn)
1774 end = next_svcn;
1775 while (end > evcn) {
1776 /* Remove segment [svcn : evcn). */
1777 mi_remove_attr(NULL, mi, attr);
1778
1779 if (!al_remove_le(ni, le)) {
1780 err = -EINVAL;
1781 goto out;
1782 }
1783
1784 if (evcn + 1 >= alloc) {
1785 /* Last attribute segment. */
1786 evcn1 = evcn + 1;
1787 goto ins_ext;
1788 }
1789
1790 if (ni_load_mi(ni, le, &mi)) {
1791 attr = NULL;
1792 goto out;
1793 }
1794
1795 attr = mi_find_attr(mi, NULL, ATTR_DATA, NULL, 0,
1796 &le->id);
1797 if (!attr) {
1798 err = -EINVAL;
1799 goto out;
1800 }
1801 svcn = le64_to_cpu(attr->nres.svcn);
1802 evcn = le64_to_cpu(attr->nres.evcn);
1803 }
1804
1805 if (end < svcn)
1806 end = svcn;
1807
1808 err = attr_load_runs(attr, ni, run, &end);
1809 if (err)
1810 goto out;
1811
1812 evcn1 = evcn + 1;
1813 attr->nres.svcn = cpu_to_le64(next_svcn);
1814 err = mi_pack_runs(mi, attr, run, evcn1 - next_svcn);
1815 if (err)
1816 goto out;
1817
1818 le->vcn = cpu_to_le64(next_svcn);
1819 ni->attr_list.dirty = true;
1820 mi->dirty = true;
1821
1822 next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
1823 }
1824 ins_ext:
1825 if (evcn1 > next_svcn) {
1826 err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run,
1827 next_svcn, evcn1 - next_svcn,
1828 attr_b->flags, &attr, &mi, NULL);
1829 if (err)
1830 goto out;
1831 }
1832 ok:
1833 run_truncate_around(run, vcn);
1834 out:
1835 if (attr_b) {
1836 if (new_valid > data_size)
1837 new_valid = data_size;
1838
1839 valid_size = le64_to_cpu(attr_b->nres.valid_size);
1840 if (new_valid != valid_size) {
1841 attr_b->nres.valid_size = cpu_to_le64(valid_size);
1842 mi_b->dirty = true;
1843 }
1844 }
1845
1846 return err;
1847 }
1848
1849 /*
1850 * attr_collapse_range - Collapse range in file.
1851 */
attr_collapse_range(struct ntfs_inode * ni,u64 vbo,u64 bytes)1852 int attr_collapse_range(struct ntfs_inode *ni, u64 vbo, u64 bytes)
1853 {
1854 int err = 0;
1855 struct runs_tree *run = &ni->file.run;
1856 struct ntfs_sb_info *sbi = ni->mi.sbi;
1857 struct ATTRIB *attr = NULL, *attr_b;
1858 struct ATTR_LIST_ENTRY *le, *le_b;
1859 struct mft_inode *mi, *mi_b;
1860 CLST svcn, evcn1, len, dealloc, alen;
1861 CLST vcn, end;
1862 u64 valid_size, data_size, alloc_size, total_size;
1863 u32 mask;
1864 __le16 a_flags;
1865
1866 if (!bytes)
1867 return 0;
1868
1869 le_b = NULL;
1870 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b);
1871 if (!attr_b)
1872 return -ENOENT;
1873
1874 if (!attr_b->non_res) {
1875 /* Attribute is resident. Nothing to do? */
1876 return 0;
1877 }
1878
1879 data_size = le64_to_cpu(attr_b->nres.data_size);
1880 alloc_size = le64_to_cpu(attr_b->nres.alloc_size);
1881 a_flags = attr_b->flags;
1882
1883 if (is_attr_ext(attr_b)) {
1884 total_size = le64_to_cpu(attr_b->nres.total_size);
1885 mask = (sbi->cluster_size << attr_b->nres.c_unit) - 1;
1886 } else {
1887 total_size = alloc_size;
1888 mask = sbi->cluster_mask;
1889 }
1890
1891 if ((vbo & mask) || (bytes & mask)) {
1892 /* Allow to collapse only cluster aligned ranges. */
1893 return -EINVAL;
1894 }
1895
1896 if (vbo > data_size)
1897 return -EINVAL;
1898
1899 down_write(&ni->file.run_lock);
1900
1901 if (vbo + bytes >= data_size) {
1902 u64 new_valid = min(ni->i_valid, vbo);
1903
1904 /* Simple truncate file at 'vbo'. */
1905 truncate_setsize(&ni->vfs_inode, vbo);
1906 err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, vbo,
1907 &new_valid, true, NULL);
1908
1909 if (!err && new_valid < ni->i_valid)
1910 ni->i_valid = new_valid;
1911
1912 goto out;
1913 }
1914
1915 /*
1916 * Enumerate all attribute segments and collapse.
1917 */
1918 alen = alloc_size >> sbi->cluster_bits;
1919 vcn = vbo >> sbi->cluster_bits;
1920 len = bytes >> sbi->cluster_bits;
1921 end = vcn + len;
1922 dealloc = 0;
1923
1924 svcn = le64_to_cpu(attr_b->nres.svcn);
1925 evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1;
1926
1927 if (svcn <= vcn && vcn < evcn1) {
1928 attr = attr_b;
1929 le = le_b;
1930 mi = mi_b;
1931 } else if (!le_b) {
1932 err = -EINVAL;
1933 goto out;
1934 } else {
1935 le = le_b;
1936 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
1937 &mi);
1938 if (!attr) {
1939 err = -EINVAL;
1940 goto out;
1941 }
1942
1943 svcn = le64_to_cpu(attr->nres.svcn);
1944 evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
1945 }
1946
1947 for (;;) {
1948 if (svcn >= end) {
1949 /* Shift VCN- */
1950 attr->nres.svcn = cpu_to_le64(svcn - len);
1951 attr->nres.evcn = cpu_to_le64(evcn1 - 1 - len);
1952 if (le) {
1953 le->vcn = attr->nres.svcn;
1954 ni->attr_list.dirty = true;
1955 }
1956 mi->dirty = true;
1957 } else if (svcn < vcn || end < evcn1) {
1958 CLST vcn1, eat, next_svcn;
1959
1960 /* Collapse a part of this attribute segment. */
1961 err = attr_load_runs(attr, ni, run, &svcn);
1962 if (err)
1963 goto out;
1964 vcn1 = max(vcn, svcn);
1965 eat = min(end, evcn1) - vcn1;
1966
1967 err = run_deallocate_ex(sbi, run, vcn1, eat, &dealloc,
1968 true);
1969 if (err)
1970 goto out;
1971
1972 if (!run_collapse_range(run, vcn1, eat)) {
1973 err = -ENOMEM;
1974 goto out;
1975 }
1976
1977 if (svcn >= vcn) {
1978 /* Shift VCN */
1979 attr->nres.svcn = cpu_to_le64(vcn);
1980 if (le) {
1981 le->vcn = attr->nres.svcn;
1982 ni->attr_list.dirty = true;
1983 }
1984 }
1985
1986 err = mi_pack_runs(mi, attr, run, evcn1 - svcn - eat);
1987 if (err)
1988 goto out;
1989
1990 next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
1991 if (next_svcn + eat < evcn1) {
1992 err = ni_insert_nonresident(
1993 ni, ATTR_DATA, NULL, 0, run, next_svcn,
1994 evcn1 - eat - next_svcn, a_flags, &attr,
1995 &mi, &le);
1996 if (err)
1997 goto out;
1998
1999 /* Layout of records maybe changed. */
2000 attr_b = NULL;
2001 }
2002
2003 /* Free all allocated memory. */
2004 run_truncate(run, 0);
2005 } else {
2006 u16 le_sz;
2007 u16 roff = le16_to_cpu(attr->nres.run_off);
2008
2009 if (roff > le32_to_cpu(attr->size)) {
2010 err = -EINVAL;
2011 goto out;
2012 }
2013
2014 run_unpack_ex(RUN_DEALLOCATE, sbi, ni->mi.rno, svcn,
2015 evcn1 - 1, svcn, Add2Ptr(attr, roff),
2016 le32_to_cpu(attr->size) - roff);
2017
2018 /* Delete this attribute segment. */
2019 mi_remove_attr(NULL, mi, attr);
2020 if (!le)
2021 break;
2022
2023 le_sz = le16_to_cpu(le->size);
2024 if (!al_remove_le(ni, le)) {
2025 err = -EINVAL;
2026 goto out;
2027 }
2028
2029 if (evcn1 >= alen)
2030 break;
2031
2032 if (!svcn) {
2033 /* Load next record that contains this attribute. */
2034 if (ni_load_mi(ni, le, &mi)) {
2035 err = -EINVAL;
2036 goto out;
2037 }
2038
2039 /* Look for required attribute. */
2040 attr = mi_find_attr(mi, NULL, ATTR_DATA, NULL,
2041 0, &le->id);
2042 if (!attr) {
2043 err = -EINVAL;
2044 goto out;
2045 }
2046 goto next_attr;
2047 }
2048 le = (struct ATTR_LIST_ENTRY *)((u8 *)le - le_sz);
2049 }
2050
2051 if (evcn1 >= alen)
2052 break;
2053
2054 attr = ni_enum_attr_ex(ni, attr, &le, &mi);
2055 if (!attr) {
2056 err = -EINVAL;
2057 goto out;
2058 }
2059
2060 next_attr:
2061 svcn = le64_to_cpu(attr->nres.svcn);
2062 evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
2063 }
2064
2065 if (!attr_b) {
2066 le_b = NULL;
2067 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL,
2068 &mi_b);
2069 if (!attr_b) {
2070 err = -ENOENT;
2071 goto out;
2072 }
2073 }
2074
2075 data_size -= bytes;
2076 valid_size = ni->i_valid;
2077 if (vbo + bytes <= valid_size)
2078 valid_size -= bytes;
2079 else if (vbo < valid_size)
2080 valid_size = vbo;
2081
2082 attr_b->nres.alloc_size = cpu_to_le64(alloc_size - bytes);
2083 attr_b->nres.data_size = cpu_to_le64(data_size);
2084 attr_b->nres.valid_size = cpu_to_le64(min(valid_size, data_size));
2085 total_size -= (u64)dealloc << sbi->cluster_bits;
2086 if (is_attr_ext(attr_b))
2087 attr_b->nres.total_size = cpu_to_le64(total_size);
2088 mi_b->dirty = true;
2089
2090 /* Update inode size. */
2091 ni->i_valid = valid_size;
2092 i_size_write(&ni->vfs_inode, data_size);
2093 inode_set_bytes(&ni->vfs_inode, total_size);
2094 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
2095 mark_inode_dirty(&ni->vfs_inode);
2096
2097 out:
2098 up_write(&ni->file.run_lock);
2099 if (err)
2100 _ntfs_bad_inode(&ni->vfs_inode);
2101
2102 return err;
2103 }
2104
2105 /*
2106 * attr_punch_hole
2107 *
2108 * Not for normal files.
2109 */
attr_punch_hole(struct ntfs_inode * ni,u64 vbo,u64 bytes,u32 * frame_size)2110 int attr_punch_hole(struct ntfs_inode *ni, u64 vbo, u64 bytes, u32 *frame_size)
2111 {
2112 int err = 0;
2113 struct runs_tree *run = &ni->file.run;
2114 struct ntfs_sb_info *sbi = ni->mi.sbi;
2115 struct ATTRIB *attr = NULL, *attr_b;
2116 struct ATTR_LIST_ENTRY *le, *le_b;
2117 struct mft_inode *mi, *mi_b;
2118 CLST svcn, evcn1, vcn, len, end, alen, hole, next_svcn;
2119 u64 total_size, alloc_size;
2120 u32 mask;
2121 __le16 a_flags;
2122 struct runs_tree run2;
2123
2124 if (!bytes)
2125 return 0;
2126
2127 le_b = NULL;
2128 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b);
2129 if (!attr_b)
2130 return -ENOENT;
2131
2132 if (!attr_b->non_res) {
2133 u32 data_size = le32_to_cpu(attr_b->res.data_size);
2134 u32 from, to;
2135
2136 if (vbo > data_size)
2137 return 0;
2138
2139 from = vbo;
2140 to = min_t(u64, vbo + bytes, data_size);
2141 memset(Add2Ptr(resident_data(attr_b), from), 0, to - from);
2142 return 0;
2143 }
2144
2145 if (!is_attr_ext(attr_b))
2146 return -EOPNOTSUPP;
2147
2148 alloc_size = le64_to_cpu(attr_b->nres.alloc_size);
2149 total_size = le64_to_cpu(attr_b->nres.total_size);
2150
2151 if (vbo >= alloc_size) {
2152 /* NOTE: It is allowed. */
2153 return 0;
2154 }
2155
2156 mask = (sbi->cluster_size << attr_b->nres.c_unit) - 1;
2157
2158 bytes += vbo;
2159 if (bytes > alloc_size)
2160 bytes = alloc_size;
2161 bytes -= vbo;
2162
2163 if ((vbo & mask) || (bytes & mask)) {
2164 /* We have to zero a range(s). */
2165 if (frame_size == NULL) {
2166 /* Caller insists range is aligned. */
2167 return -EINVAL;
2168 }
2169 *frame_size = mask + 1;
2170 return E_NTFS_NOTALIGNED;
2171 }
2172
2173 down_write(&ni->file.run_lock);
2174 run_init(&run2);
2175 run_truncate(run, 0);
2176
2177 /*
2178 * Enumerate all attribute segments and punch hole where necessary.
2179 */
2180 alen = alloc_size >> sbi->cluster_bits;
2181 vcn = vbo >> sbi->cluster_bits;
2182 len = bytes >> sbi->cluster_bits;
2183 end = vcn + len;
2184 hole = 0;
2185
2186 svcn = le64_to_cpu(attr_b->nres.svcn);
2187 evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1;
2188 a_flags = attr_b->flags;
2189
2190 if (svcn <= vcn && vcn < evcn1) {
2191 attr = attr_b;
2192 le = le_b;
2193 mi = mi_b;
2194 } else if (!le_b) {
2195 err = -EINVAL;
2196 goto bad_inode;
2197 } else {
2198 le = le_b;
2199 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
2200 &mi);
2201 if (!attr) {
2202 err = -EINVAL;
2203 goto bad_inode;
2204 }
2205
2206 svcn = le64_to_cpu(attr->nres.svcn);
2207 evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
2208 }
2209
2210 while (svcn < end) {
2211 CLST vcn1, zero, hole2 = hole;
2212
2213 err = attr_load_runs(attr, ni, run, &svcn);
2214 if (err)
2215 goto done;
2216 vcn1 = max(vcn, svcn);
2217 zero = min(end, evcn1) - vcn1;
2218
2219 /*
2220 * Check range [vcn1 + zero).
2221 * Calculate how many clusters there are.
2222 * Don't do any destructive actions.
2223 */
2224 err = run_deallocate_ex(NULL, run, vcn1, zero, &hole2, false);
2225 if (err)
2226 goto done;
2227
2228 /* Check if required range is already hole. */
2229 if (hole2 == hole)
2230 goto next_attr;
2231
2232 /* Make a clone of run to undo. */
2233 err = run_clone(run, &run2);
2234 if (err)
2235 goto done;
2236
2237 /* Make a hole range (sparse) [vcn1 + zero). */
2238 if (!run_add_entry(run, vcn1, SPARSE_LCN, zero, false)) {
2239 err = -ENOMEM;
2240 goto done;
2241 }
2242
2243 /* Update run in attribute segment. */
2244 err = mi_pack_runs(mi, attr, run, evcn1 - svcn);
2245 if (err)
2246 goto done;
2247 next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
2248 if (next_svcn < evcn1) {
2249 /* Insert new attribute segment. */
2250 err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run,
2251 next_svcn,
2252 evcn1 - next_svcn, a_flags,
2253 &attr, &mi, &le);
2254 if (err)
2255 goto undo_punch;
2256
2257 /* Layout of records maybe changed. */
2258 attr_b = NULL;
2259 }
2260
2261 /* Real deallocate. Should not fail. */
2262 run_deallocate_ex(sbi, &run2, vcn1, zero, &hole, true);
2263
2264 next_attr:
2265 /* Free all allocated memory. */
2266 run_truncate(run, 0);
2267
2268 if (evcn1 >= alen)
2269 break;
2270
2271 /* Get next attribute segment. */
2272 attr = ni_enum_attr_ex(ni, attr, &le, &mi);
2273 if (!attr) {
2274 err = -EINVAL;
2275 goto bad_inode;
2276 }
2277
2278 svcn = le64_to_cpu(attr->nres.svcn);
2279 evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
2280 }
2281
2282 done:
2283 if (!hole)
2284 goto out;
2285
2286 if (!attr_b) {
2287 attr_b = ni_find_attr(ni, NULL, NULL, ATTR_DATA, NULL, 0, NULL,
2288 &mi_b);
2289 if (!attr_b) {
2290 err = -EINVAL;
2291 goto bad_inode;
2292 }
2293 }
2294
2295 total_size -= (u64)hole << sbi->cluster_bits;
2296 attr_b->nres.total_size = cpu_to_le64(total_size);
2297 mi_b->dirty = true;
2298
2299 /* Update inode size. */
2300 inode_set_bytes(&ni->vfs_inode, total_size);
2301 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
2302 mark_inode_dirty(&ni->vfs_inode);
2303
2304 out:
2305 run_close(&run2);
2306 up_write(&ni->file.run_lock);
2307 return err;
2308
2309 bad_inode:
2310 _ntfs_bad_inode(&ni->vfs_inode);
2311 goto out;
2312
2313 undo_punch:
2314 /*
2315 * Restore packed runs.
2316 * 'mi_pack_runs' should not fail, cause we restore original.
2317 */
2318 if (mi_pack_runs(mi, attr, &run2, evcn1 - svcn))
2319 goto bad_inode;
2320
2321 goto done;
2322 }
2323
2324 /*
2325 * attr_insert_range - Insert range (hole) in file.
2326 * Not for normal files.
2327 */
attr_insert_range(struct ntfs_inode * ni,u64 vbo,u64 bytes)2328 int attr_insert_range(struct ntfs_inode *ni, u64 vbo, u64 bytes)
2329 {
2330 int err = 0;
2331 struct runs_tree *run = &ni->file.run;
2332 struct ntfs_sb_info *sbi = ni->mi.sbi;
2333 struct ATTRIB *attr = NULL, *attr_b;
2334 struct ATTR_LIST_ENTRY *le, *le_b;
2335 struct mft_inode *mi, *mi_b;
2336 CLST vcn, svcn, evcn1, len, next_svcn;
2337 u64 data_size, alloc_size;
2338 u32 mask;
2339 __le16 a_flags;
2340
2341 if (!bytes)
2342 return 0;
2343
2344 le_b = NULL;
2345 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b);
2346 if (!attr_b)
2347 return -ENOENT;
2348
2349 if (!is_attr_ext(attr_b)) {
2350 /* It was checked above. See fallocate. */
2351 return -EOPNOTSUPP;
2352 }
2353
2354 if (!attr_b->non_res) {
2355 data_size = le32_to_cpu(attr_b->res.data_size);
2356 alloc_size = data_size;
2357 mask = sbi->cluster_mask; /* cluster_size - 1 */
2358 } else {
2359 data_size = le64_to_cpu(attr_b->nres.data_size);
2360 alloc_size = le64_to_cpu(attr_b->nres.alloc_size);
2361 mask = (sbi->cluster_size << attr_b->nres.c_unit) - 1;
2362 }
2363
2364 if (vbo >= data_size) {
2365 /*
2366 * Insert range after the file size is not allowed.
2367 * If the offset is equal to or greater than the end of
2368 * file, an error is returned. For such operations (i.e., inserting
2369 * a hole at the end of file), ftruncate(2) should be used.
2370 */
2371 return -EINVAL;
2372 }
2373
2374 if ((vbo & mask) || (bytes & mask)) {
2375 /* Allow to insert only frame aligned ranges. */
2376 return -EINVAL;
2377 }
2378
2379 /*
2380 * valid_size <= data_size <= alloc_size
2381 * Check alloc_size for maximum possible.
2382 */
2383 if (bytes > sbi->maxbytes_sparse - alloc_size)
2384 return -EFBIG;
2385
2386 vcn = vbo >> sbi->cluster_bits;
2387 len = bytes >> sbi->cluster_bits;
2388
2389 down_write(&ni->file.run_lock);
2390
2391 if (!attr_b->non_res) {
2392 err = attr_set_size(ni, ATTR_DATA, NULL, 0, run,
2393 data_size + bytes, NULL, false, NULL);
2394
2395 le_b = NULL;
2396 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL,
2397 &mi_b);
2398 if (!attr_b) {
2399 err = -EINVAL;
2400 goto bad_inode;
2401 }
2402
2403 if (err)
2404 goto out;
2405
2406 if (!attr_b->non_res) {
2407 /* Still resident. */
2408 char *data = Add2Ptr(attr_b,
2409 le16_to_cpu(attr_b->res.data_off));
2410
2411 memmove(data + bytes, data, bytes);
2412 memset(data, 0, bytes);
2413 goto done;
2414 }
2415
2416 /* Resident files becomes nonresident. */
2417 data_size = le64_to_cpu(attr_b->nres.data_size);
2418 alloc_size = le64_to_cpu(attr_b->nres.alloc_size);
2419 }
2420
2421 /*
2422 * Enumerate all attribute segments and shift start vcn.
2423 */
2424 a_flags = attr_b->flags;
2425 svcn = le64_to_cpu(attr_b->nres.svcn);
2426 evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1;
2427
2428 if (svcn <= vcn && vcn < evcn1) {
2429 attr = attr_b;
2430 le = le_b;
2431 mi = mi_b;
2432 } else if (!le_b) {
2433 err = -EINVAL;
2434 goto bad_inode;
2435 } else {
2436 le = le_b;
2437 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
2438 &mi);
2439 if (!attr) {
2440 err = -EINVAL;
2441 goto bad_inode;
2442 }
2443
2444 svcn = le64_to_cpu(attr->nres.svcn);
2445 evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
2446 }
2447
2448 run_truncate(run, 0); /* clear cached values. */
2449 err = attr_load_runs(attr, ni, run, NULL);
2450 if (err)
2451 goto out;
2452
2453 if (!run_insert_range(run, vcn, len)) {
2454 err = -ENOMEM;
2455 goto out;
2456 }
2457
2458 /* Try to pack in current record as much as possible. */
2459 err = mi_pack_runs(mi, attr, run, evcn1 + len - svcn);
2460 if (err)
2461 goto out;
2462
2463 next_svcn = le64_to_cpu(attr->nres.evcn) + 1;
2464
2465 while ((attr = ni_enum_attr_ex(ni, attr, &le, &mi)) &&
2466 attr->type == ATTR_DATA && !attr->name_len) {
2467 le64_add_cpu(&attr->nres.svcn, len);
2468 le64_add_cpu(&attr->nres.evcn, len);
2469 if (le) {
2470 le->vcn = attr->nres.svcn;
2471 ni->attr_list.dirty = true;
2472 }
2473 mi->dirty = true;
2474 }
2475
2476 if (next_svcn < evcn1 + len) {
2477 err = ni_insert_nonresident(ni, ATTR_DATA, NULL, 0, run,
2478 next_svcn, evcn1 + len - next_svcn,
2479 a_flags, NULL, NULL, NULL);
2480
2481 le_b = NULL;
2482 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL,
2483 &mi_b);
2484 if (!attr_b) {
2485 err = -EINVAL;
2486 goto bad_inode;
2487 }
2488
2489 if (err) {
2490 /* ni_insert_nonresident failed. Try to undo. */
2491 goto undo_insert_range;
2492 }
2493 }
2494
2495 /*
2496 * Update primary attribute segment.
2497 */
2498 if (vbo <= ni->i_valid)
2499 ni->i_valid += bytes;
2500
2501 attr_b->nres.data_size = cpu_to_le64(data_size + bytes);
2502 attr_b->nres.alloc_size = cpu_to_le64(alloc_size + bytes);
2503
2504 /* ni->valid may be not equal valid_size (temporary). */
2505 if (ni->i_valid > data_size + bytes)
2506 attr_b->nres.valid_size = attr_b->nres.data_size;
2507 else
2508 attr_b->nres.valid_size = cpu_to_le64(ni->i_valid);
2509 mi_b->dirty = true;
2510
2511 done:
2512 i_size_write(&ni->vfs_inode, ni->vfs_inode.i_size + bytes);
2513 ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
2514 mark_inode_dirty(&ni->vfs_inode);
2515
2516 out:
2517 run_truncate(run, 0); /* clear cached values. */
2518
2519 up_write(&ni->file.run_lock);
2520
2521 return err;
2522
2523 bad_inode:
2524 _ntfs_bad_inode(&ni->vfs_inode);
2525 goto out;
2526
2527 undo_insert_range:
2528 svcn = le64_to_cpu(attr_b->nres.svcn);
2529 evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1;
2530
2531 if (svcn <= vcn && vcn < evcn1) {
2532 attr = attr_b;
2533 le = le_b;
2534 mi = mi_b;
2535 } else if (!le_b) {
2536 goto bad_inode;
2537 } else {
2538 le = le_b;
2539 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn,
2540 &mi);
2541 if (!attr) {
2542 goto bad_inode;
2543 }
2544
2545 svcn = le64_to_cpu(attr->nres.svcn);
2546 evcn1 = le64_to_cpu(attr->nres.evcn) + 1;
2547 }
2548
2549 if (attr_load_runs(attr, ni, run, NULL))
2550 goto bad_inode;
2551
2552 if (!run_collapse_range(run, vcn, len))
2553 goto bad_inode;
2554
2555 if (mi_pack_runs(mi, attr, run, evcn1 + len - svcn))
2556 goto bad_inode;
2557
2558 while ((attr = ni_enum_attr_ex(ni, attr, &le, &mi)) &&
2559 attr->type == ATTR_DATA && !attr->name_len) {
2560 le64_sub_cpu(&attr->nres.svcn, len);
2561 le64_sub_cpu(&attr->nres.evcn, len);
2562 if (le) {
2563 le->vcn = attr->nres.svcn;
2564 ni->attr_list.dirty = true;
2565 }
2566 mi->dirty = true;
2567 }
2568
2569 goto out;
2570 }
2571
2572 /*
2573 * attr_force_nonresident
2574 *
2575 * Convert default data attribute into non resident form.
2576 */
attr_force_nonresident(struct ntfs_inode * ni)2577 int attr_force_nonresident(struct ntfs_inode *ni)
2578 {
2579 int err;
2580 struct ATTRIB *attr;
2581 struct ATTR_LIST_ENTRY *le = NULL;
2582 struct mft_inode *mi;
2583
2584 attr = ni_find_attr(ni, NULL, &le, ATTR_DATA, NULL, 0, NULL, &mi);
2585 if (!attr) {
2586 ntfs_bad_inode(&ni->vfs_inode, "no data attribute");
2587 return -ENOENT;
2588 }
2589
2590 if (attr->non_res) {
2591 /* Already non resident. */
2592 return 0;
2593 }
2594
2595 down_write(&ni->file.run_lock);
2596 err = attr_make_nonresident(ni, attr, le, mi,
2597 le32_to_cpu(attr->res.data_size),
2598 &ni->file.run, &attr, NULL);
2599 up_write(&ni->file.run_lock);
2600
2601 return err;
2602 }
2603