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82cae269 KK |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * | |
4 | * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <linux/blkdev.h> | |
9 | #include <linux/buffer_head.h> | |
10 | #include <linux/fs.h> | |
11 | #include <linux/nls.h> | |
12 | ||
13 | #include "debug.h" | |
14 | #include "ntfs.h" | |
15 | #include "ntfs_fs.h" | |
16 | ||
17 | static const struct INDEX_NAMES { | |
18 | const __le16 *name; | |
19 | u8 name_len; | |
20 | } s_index_names[INDEX_MUTEX_TOTAL] = { | |
21 | { I30_NAME, ARRAY_SIZE(I30_NAME) }, { SII_NAME, ARRAY_SIZE(SII_NAME) }, | |
22 | { SDH_NAME, ARRAY_SIZE(SDH_NAME) }, { SO_NAME, ARRAY_SIZE(SO_NAME) }, | |
23 | { SQ_NAME, ARRAY_SIZE(SQ_NAME) }, { SR_NAME, ARRAY_SIZE(SR_NAME) }, | |
24 | }; | |
25 | ||
26 | /* | |
27 | * compare two names in index | |
28 | * if l1 != 0 | |
29 | * both names are little endian on-disk ATTR_FILE_NAME structs | |
30 | * else | |
31 | * key1 - cpu_str, key2 - ATTR_FILE_NAME | |
32 | */ | |
33 | static int cmp_fnames(const void *key1, size_t l1, const void *key2, size_t l2, | |
34 | const void *data) | |
35 | { | |
36 | const struct ATTR_FILE_NAME *f2 = key2; | |
37 | const struct ntfs_sb_info *sbi = data; | |
38 | const struct ATTR_FILE_NAME *f1; | |
39 | u16 fsize2; | |
40 | bool both_case; | |
41 | ||
42 | if (l2 <= offsetof(struct ATTR_FILE_NAME, name)) | |
43 | return -1; | |
44 | ||
45 | fsize2 = fname_full_size(f2); | |
46 | if (l2 < fsize2) | |
47 | return -1; | |
48 | ||
49 | both_case = f2->type != FILE_NAME_DOS /*&& !sbi->options.nocase*/; | |
50 | if (!l1) { | |
51 | const struct le_str *s2 = (struct le_str *)&f2->name_len; | |
52 | ||
53 | /* | |
54 | * If names are equal (case insensitive) | |
55 | * try to compare it case sensitive | |
56 | */ | |
57 | return ntfs_cmp_names_cpu(key1, s2, sbi->upcase, both_case); | |
58 | } | |
59 | ||
60 | f1 = key1; | |
61 | return ntfs_cmp_names(f1->name, f1->name_len, f2->name, f2->name_len, | |
62 | sbi->upcase, both_case); | |
63 | } | |
64 | ||
65 | /* $SII of $Secure and $Q of Quota */ | |
66 | static int cmp_uint(const void *key1, size_t l1, const void *key2, size_t l2, | |
67 | const void *data) | |
68 | { | |
69 | const u32 *k1 = key1; | |
70 | const u32 *k2 = key2; | |
71 | ||
72 | if (l2 < sizeof(u32)) | |
73 | return -1; | |
74 | ||
75 | if (*k1 < *k2) | |
76 | return -1; | |
77 | if (*k1 > *k2) | |
78 | return 1; | |
79 | return 0; | |
80 | } | |
81 | ||
82 | /* $SDH of $Secure */ | |
83 | static int cmp_sdh(const void *key1, size_t l1, const void *key2, size_t l2, | |
84 | const void *data) | |
85 | { | |
86 | const struct SECURITY_KEY *k1 = key1; | |
87 | const struct SECURITY_KEY *k2 = key2; | |
88 | u32 t1, t2; | |
89 | ||
90 | if (l2 < sizeof(struct SECURITY_KEY)) | |
91 | return -1; | |
92 | ||
93 | t1 = le32_to_cpu(k1->hash); | |
94 | t2 = le32_to_cpu(k2->hash); | |
95 | ||
96 | /* First value is a hash value itself */ | |
97 | if (t1 < t2) | |
98 | return -1; | |
99 | if (t1 > t2) | |
100 | return 1; | |
101 | ||
102 | /* Second value is security Id */ | |
103 | if (data) { | |
104 | t1 = le32_to_cpu(k1->sec_id); | |
105 | t2 = le32_to_cpu(k2->sec_id); | |
106 | if (t1 < t2) | |
107 | return -1; | |
108 | if (t1 > t2) | |
109 | return 1; | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | /* $O of ObjId and "$R" for Reparse */ | |
116 | static int cmp_uints(const void *key1, size_t l1, const void *key2, size_t l2, | |
117 | const void *data) | |
118 | { | |
119 | const __le32 *k1 = key1; | |
120 | const __le32 *k2 = key2; | |
121 | size_t count; | |
122 | ||
123 | if ((size_t)data == 1) { | |
124 | /* | |
125 | * ni_delete_all -> ntfs_remove_reparse -> delete all with this reference | |
126 | * k1, k2 - pointers to REPARSE_KEY | |
127 | */ | |
128 | ||
129 | k1 += 1; // skip REPARSE_KEY.ReparseTag | |
130 | k2 += 1; // skip REPARSE_KEY.ReparseTag | |
131 | if (l2 <= sizeof(int)) | |
132 | return -1; | |
133 | l2 -= sizeof(int); | |
134 | if (l1 <= sizeof(int)) | |
135 | return 1; | |
136 | l1 -= sizeof(int); | |
137 | } | |
138 | ||
139 | if (l2 < sizeof(int)) | |
140 | return -1; | |
141 | ||
142 | for (count = min(l1, l2) >> 2; count > 0; --count, ++k1, ++k2) { | |
143 | u32 t1 = le32_to_cpu(*k1); | |
144 | u32 t2 = le32_to_cpu(*k2); | |
145 | ||
146 | if (t1 > t2) | |
147 | return 1; | |
148 | if (t1 < t2) | |
149 | return -1; | |
150 | } | |
151 | ||
152 | if (l1 > l2) | |
153 | return 1; | |
154 | if (l1 < l2) | |
155 | return -1; | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static inline NTFS_CMP_FUNC get_cmp_func(const struct INDEX_ROOT *root) | |
161 | { | |
162 | switch (root->type) { | |
163 | case ATTR_NAME: | |
164 | if (root->rule == NTFS_COLLATION_TYPE_FILENAME) | |
165 | return &cmp_fnames; | |
166 | break; | |
167 | case ATTR_ZERO: | |
168 | switch (root->rule) { | |
169 | case NTFS_COLLATION_TYPE_UINT: | |
170 | return &cmp_uint; | |
171 | case NTFS_COLLATION_TYPE_SECURITY_HASH: | |
172 | return &cmp_sdh; | |
173 | case NTFS_COLLATION_TYPE_UINTS: | |
174 | return &cmp_uints; | |
175 | default: | |
176 | break; | |
177 | } | |
178 | default: | |
179 | break; | |
180 | } | |
181 | ||
182 | return NULL; | |
183 | } | |
184 | ||
185 | struct bmp_buf { | |
186 | struct ATTRIB *b; | |
187 | struct mft_inode *mi; | |
188 | struct buffer_head *bh; | |
189 | ulong *buf; | |
190 | size_t bit; | |
191 | u32 nbits; | |
192 | u64 new_valid; | |
193 | }; | |
194 | ||
195 | static int bmp_buf_get(struct ntfs_index *indx, struct ntfs_inode *ni, | |
196 | size_t bit, struct bmp_buf *bbuf) | |
197 | { | |
198 | struct ATTRIB *b; | |
199 | size_t data_size, valid_size, vbo, off = bit >> 3; | |
200 | struct ntfs_sb_info *sbi = ni->mi.sbi; | |
201 | CLST vcn = off >> sbi->cluster_bits; | |
202 | struct ATTR_LIST_ENTRY *le = NULL; | |
203 | struct buffer_head *bh; | |
204 | struct super_block *sb; | |
205 | u32 blocksize; | |
206 | const struct INDEX_NAMES *in = &s_index_names[indx->type]; | |
207 | ||
208 | bbuf->bh = NULL; | |
209 | ||
210 | b = ni_find_attr(ni, NULL, &le, ATTR_BITMAP, in->name, in->name_len, | |
211 | &vcn, &bbuf->mi); | |
212 | bbuf->b = b; | |
213 | if (!b) | |
214 | return -EINVAL; | |
215 | ||
216 | if (!b->non_res) { | |
217 | data_size = le32_to_cpu(b->res.data_size); | |
218 | ||
219 | if (off >= data_size) | |
220 | return -EINVAL; | |
221 | ||
222 | bbuf->buf = (ulong *)resident_data(b); | |
223 | bbuf->bit = 0; | |
224 | bbuf->nbits = data_size * 8; | |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
229 | data_size = le64_to_cpu(b->nres.data_size); | |
230 | if (WARN_ON(off >= data_size)) { | |
231 | /* looks like filesystem error */ | |
232 | return -EINVAL; | |
233 | } | |
234 | ||
235 | valid_size = le64_to_cpu(b->nres.valid_size); | |
236 | ||
237 | bh = ntfs_bread_run(sbi, &indx->bitmap_run, off); | |
238 | if (!bh) | |
239 | return -EIO; | |
240 | ||
241 | if (IS_ERR(bh)) | |
242 | return PTR_ERR(bh); | |
243 | ||
244 | bbuf->bh = bh; | |
245 | ||
246 | if (buffer_locked(bh)) | |
247 | __wait_on_buffer(bh); | |
248 | ||
249 | lock_buffer(bh); | |
250 | ||
251 | sb = sbi->sb; | |
252 | blocksize = sb->s_blocksize; | |
253 | ||
254 | vbo = off & ~(size_t)sbi->block_mask; | |
255 | ||
256 | bbuf->new_valid = vbo + blocksize; | |
257 | if (bbuf->new_valid <= valid_size) | |
258 | bbuf->new_valid = 0; | |
259 | else if (bbuf->new_valid > data_size) | |
260 | bbuf->new_valid = data_size; | |
261 | ||
262 | if (vbo >= valid_size) { | |
263 | memset(bh->b_data, 0, blocksize); | |
264 | } else if (vbo + blocksize > valid_size) { | |
265 | u32 voff = valid_size & sbi->block_mask; | |
266 | ||
267 | memset(bh->b_data + voff, 0, blocksize - voff); | |
268 | } | |
269 | ||
270 | bbuf->buf = (ulong *)bh->b_data; | |
271 | bbuf->bit = 8 * (off & ~(size_t)sbi->block_mask); | |
272 | bbuf->nbits = 8 * blocksize; | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | static void bmp_buf_put(struct bmp_buf *bbuf, bool dirty) | |
278 | { | |
279 | struct buffer_head *bh = bbuf->bh; | |
280 | struct ATTRIB *b = bbuf->b; | |
281 | ||
282 | if (!bh) { | |
283 | if (b && !b->non_res && dirty) | |
284 | bbuf->mi->dirty = true; | |
285 | return; | |
286 | } | |
287 | ||
288 | if (!dirty) | |
289 | goto out; | |
290 | ||
291 | if (bbuf->new_valid) { | |
292 | b->nres.valid_size = cpu_to_le64(bbuf->new_valid); | |
293 | bbuf->mi->dirty = true; | |
294 | } | |
295 | ||
296 | set_buffer_uptodate(bh); | |
297 | mark_buffer_dirty(bh); | |
298 | ||
299 | out: | |
300 | unlock_buffer(bh); | |
301 | put_bh(bh); | |
302 | } | |
303 | ||
304 | /* | |
305 | * indx_mark_used | |
306 | * | |
307 | * marks the bit 'bit' as used | |
308 | */ | |
309 | static int indx_mark_used(struct ntfs_index *indx, struct ntfs_inode *ni, | |
310 | size_t bit) | |
311 | { | |
312 | int err; | |
313 | struct bmp_buf bbuf; | |
314 | ||
315 | err = bmp_buf_get(indx, ni, bit, &bbuf); | |
316 | if (err) | |
317 | return err; | |
318 | ||
319 | __set_bit(bit - bbuf.bit, bbuf.buf); | |
320 | ||
321 | bmp_buf_put(&bbuf, true); | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | /* | |
327 | * indx_mark_free | |
328 | * | |
329 | * the bit 'bit' as free | |
330 | */ | |
331 | static int indx_mark_free(struct ntfs_index *indx, struct ntfs_inode *ni, | |
332 | size_t bit) | |
333 | { | |
334 | int err; | |
335 | struct bmp_buf bbuf; | |
336 | ||
337 | err = bmp_buf_get(indx, ni, bit, &bbuf); | |
338 | if (err) | |
339 | return err; | |
340 | ||
341 | __clear_bit(bit - bbuf.bit, bbuf.buf); | |
342 | ||
343 | bmp_buf_put(&bbuf, true); | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
348 | /* | |
349 | * if ntfs_readdir calls this function (indx_used_bit -> scan_nres_bitmap), | |
350 | * inode is shared locked and no ni_lock | |
351 | * use rw_semaphore for read/write access to bitmap_run | |
352 | */ | |
353 | static int scan_nres_bitmap(struct ntfs_inode *ni, struct ATTRIB *bitmap, | |
354 | struct ntfs_index *indx, size_t from, | |
355 | bool (*fn)(const ulong *buf, u32 bit, u32 bits, | |
356 | size_t *ret), | |
357 | size_t *ret) | |
358 | { | |
359 | struct ntfs_sb_info *sbi = ni->mi.sbi; | |
360 | struct super_block *sb = sbi->sb; | |
361 | struct runs_tree *run = &indx->bitmap_run; | |
362 | struct rw_semaphore *lock = &indx->run_lock; | |
363 | u32 nbits = sb->s_blocksize * 8; | |
364 | u32 blocksize = sb->s_blocksize; | |
365 | u64 valid_size = le64_to_cpu(bitmap->nres.valid_size); | |
366 | u64 data_size = le64_to_cpu(bitmap->nres.data_size); | |
367 | sector_t eblock = bytes_to_block(sb, data_size); | |
368 | size_t vbo = from >> 3; | |
369 | sector_t blk = (vbo & sbi->cluster_mask) >> sb->s_blocksize_bits; | |
370 | sector_t vblock = vbo >> sb->s_blocksize_bits; | |
371 | sector_t blen, block; | |
372 | CLST lcn, clen, vcn, vcn_next; | |
373 | size_t idx; | |
374 | struct buffer_head *bh; | |
375 | bool ok; | |
376 | ||
377 | *ret = MINUS_ONE_T; | |
378 | ||
379 | if (vblock >= eblock) | |
380 | return 0; | |
381 | ||
382 | from &= nbits - 1; | |
383 | vcn = vbo >> sbi->cluster_bits; | |
384 | ||
385 | down_read(lock); | |
386 | ok = run_lookup_entry(run, vcn, &lcn, &clen, &idx); | |
387 | up_read(lock); | |
388 | ||
389 | next_run: | |
390 | if (!ok) { | |
391 | int err; | |
392 | const struct INDEX_NAMES *name = &s_index_names[indx->type]; | |
393 | ||
394 | down_write(lock); | |
395 | err = attr_load_runs_vcn(ni, ATTR_BITMAP, name->name, | |
396 | name->name_len, run, vcn); | |
397 | up_write(lock); | |
398 | if (err) | |
399 | return err; | |
400 | down_read(lock); | |
401 | ok = run_lookup_entry(run, vcn, &lcn, &clen, &idx); | |
402 | up_read(lock); | |
403 | if (!ok) | |
404 | return -EINVAL; | |
405 | } | |
406 | ||
407 | blen = (sector_t)clen * sbi->blocks_per_cluster; | |
408 | block = (sector_t)lcn * sbi->blocks_per_cluster; | |
409 | ||
410 | for (; blk < blen; blk++, from = 0) { | |
411 | bh = ntfs_bread(sb, block + blk); | |
412 | if (!bh) | |
413 | return -EIO; | |
414 | ||
415 | vbo = (u64)vblock << sb->s_blocksize_bits; | |
416 | if (vbo >= valid_size) { | |
417 | memset(bh->b_data, 0, blocksize); | |
418 | } else if (vbo + blocksize > valid_size) { | |
419 | u32 voff = valid_size & sbi->block_mask; | |
420 | ||
421 | memset(bh->b_data + voff, 0, blocksize - voff); | |
422 | } | |
423 | ||
424 | if (vbo + blocksize > data_size) | |
425 | nbits = 8 * (data_size - vbo); | |
426 | ||
427 | ok = nbits > from ? (*fn)((ulong *)bh->b_data, from, nbits, ret) | |
428 | : false; | |
429 | put_bh(bh); | |
430 | ||
431 | if (ok) { | |
432 | *ret += 8 * vbo; | |
433 | return 0; | |
434 | } | |
435 | ||
436 | if (++vblock >= eblock) { | |
437 | *ret = MINUS_ONE_T; | |
438 | return 0; | |
439 | } | |
440 | } | |
441 | blk = 0; | |
442 | vcn_next = vcn + clen; | |
443 | down_read(lock); | |
444 | ok = run_get_entry(run, ++idx, &vcn, &lcn, &clen) && vcn == vcn_next; | |
445 | if (!ok) | |
446 | vcn = vcn_next; | |
447 | up_read(lock); | |
448 | goto next_run; | |
449 | } | |
450 | ||
451 | static bool scan_for_free(const ulong *buf, u32 bit, u32 bits, size_t *ret) | |
452 | { | |
453 | size_t pos = find_next_zero_bit(buf, bits, bit); | |
454 | ||
455 | if (pos >= bits) | |
456 | return false; | |
457 | *ret = pos; | |
458 | return true; | |
459 | } | |
460 | ||
461 | /* | |
462 | * indx_find_free | |
463 | * | |
464 | * looks for free bit | |
465 | * returns -1 if no free bits | |
466 | */ | |
467 | static int indx_find_free(struct ntfs_index *indx, struct ntfs_inode *ni, | |
468 | size_t *bit, struct ATTRIB **bitmap) | |
469 | { | |
470 | struct ATTRIB *b; | |
471 | struct ATTR_LIST_ENTRY *le = NULL; | |
472 | const struct INDEX_NAMES *in = &s_index_names[indx->type]; | |
473 | int err; | |
474 | ||
475 | b = ni_find_attr(ni, NULL, &le, ATTR_BITMAP, in->name, in->name_len, | |
476 | NULL, NULL); | |
477 | ||
478 | if (!b) | |
479 | return -ENOENT; | |
480 | ||
481 | *bitmap = b; | |
482 | *bit = MINUS_ONE_T; | |
483 | ||
484 | if (!b->non_res) { | |
485 | u32 nbits = 8 * le32_to_cpu(b->res.data_size); | |
486 | size_t pos = find_next_zero_bit(resident_data(b), nbits, 0); | |
487 | ||
488 | if (pos < nbits) | |
489 | *bit = pos; | |
490 | } else { | |
491 | err = scan_nres_bitmap(ni, b, indx, 0, &scan_for_free, bit); | |
492 | ||
493 | if (err) | |
494 | return err; | |
495 | } | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | static bool scan_for_used(const ulong *buf, u32 bit, u32 bits, size_t *ret) | |
501 | { | |
502 | size_t pos = find_next_bit(buf, bits, bit); | |
503 | ||
504 | if (pos >= bits) | |
505 | return false; | |
506 | *ret = pos; | |
507 | return true; | |
508 | } | |
509 | ||
510 | /* | |
511 | * indx_used_bit | |
512 | * | |
513 | * looks for used bit | |
514 | * returns MINUS_ONE_T if no used bits | |
515 | */ | |
516 | int indx_used_bit(struct ntfs_index *indx, struct ntfs_inode *ni, size_t *bit) | |
517 | { | |
518 | struct ATTRIB *b; | |
519 | struct ATTR_LIST_ENTRY *le = NULL; | |
520 | size_t from = *bit; | |
521 | const struct INDEX_NAMES *in = &s_index_names[indx->type]; | |
522 | int err; | |
523 | ||
524 | b = ni_find_attr(ni, NULL, &le, ATTR_BITMAP, in->name, in->name_len, | |
525 | NULL, NULL); | |
526 | ||
527 | if (!b) | |
528 | return -ENOENT; | |
529 | ||
530 | *bit = MINUS_ONE_T; | |
531 | ||
532 | if (!b->non_res) { | |
533 | u32 nbits = le32_to_cpu(b->res.data_size) * 8; | |
534 | size_t pos = find_next_bit(resident_data(b), nbits, from); | |
535 | ||
536 | if (pos < nbits) | |
537 | *bit = pos; | |
538 | } else { | |
539 | err = scan_nres_bitmap(ni, b, indx, from, &scan_for_used, bit); | |
540 | if (err) | |
541 | return err; | |
542 | } | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | /* | |
548 | * hdr_find_split | |
549 | * | |
550 | * finds a point at which the index allocation buffer would like to | |
551 | * be split. | |
552 | * NOTE: This function should never return 'END' entry NULL returns on error | |
553 | */ | |
554 | static const struct NTFS_DE *hdr_find_split(const struct INDEX_HDR *hdr) | |
555 | { | |
556 | size_t o; | |
557 | const struct NTFS_DE *e = hdr_first_de(hdr); | |
558 | u32 used_2 = le32_to_cpu(hdr->used) >> 1; | |
559 | u16 esize = le16_to_cpu(e->size); | |
560 | ||
561 | if (!e || de_is_last(e)) | |
562 | return NULL; | |
563 | ||
564 | for (o = le32_to_cpu(hdr->de_off) + esize; o < used_2; o += esize) { | |
565 | const struct NTFS_DE *p = e; | |
566 | ||
567 | e = Add2Ptr(hdr, o); | |
568 | ||
569 | /* We must not return END entry */ | |
570 | if (de_is_last(e)) | |
571 | return p; | |
572 | ||
573 | esize = le16_to_cpu(e->size); | |
574 | } | |
575 | ||
576 | return e; | |
577 | } | |
578 | ||
579 | /* | |
580 | * hdr_insert_head | |
581 | * | |
582 | * inserts some entries at the beginning of the buffer. | |
583 | * It is used to insert entries into a newly-created buffer. | |
584 | */ | |
585 | static const struct NTFS_DE *hdr_insert_head(struct INDEX_HDR *hdr, | |
586 | const void *ins, u32 ins_bytes) | |
587 | { | |
588 | u32 to_move; | |
589 | struct NTFS_DE *e = hdr_first_de(hdr); | |
590 | u32 used = le32_to_cpu(hdr->used); | |
591 | ||
592 | if (!e) | |
593 | return NULL; | |
594 | ||
595 | /* Now we just make room for the inserted entries and jam it in. */ | |
596 | to_move = used - le32_to_cpu(hdr->de_off); | |
597 | memmove(Add2Ptr(e, ins_bytes), e, to_move); | |
598 | memcpy(e, ins, ins_bytes); | |
599 | hdr->used = cpu_to_le32(used + ins_bytes); | |
600 | ||
601 | return e; | |
602 | } | |
603 | ||
604 | void fnd_clear(struct ntfs_fnd *fnd) | |
605 | { | |
606 | int i; | |
607 | ||
608 | for (i = 0; i < fnd->level; i++) { | |
609 | struct indx_node *n = fnd->nodes[i]; | |
610 | ||
611 | if (!n) | |
612 | continue; | |
613 | ||
614 | put_indx_node(n); | |
615 | fnd->nodes[i] = NULL; | |
616 | } | |
617 | fnd->level = 0; | |
618 | fnd->root_de = NULL; | |
619 | } | |
620 | ||
621 | static int fnd_push(struct ntfs_fnd *fnd, struct indx_node *n, | |
622 | struct NTFS_DE *e) | |
623 | { | |
624 | int i; | |
625 | ||
626 | i = fnd->level; | |
627 | if (i < 0 || i >= ARRAY_SIZE(fnd->nodes)) | |
628 | return -EINVAL; | |
629 | fnd->nodes[i] = n; | |
630 | fnd->de[i] = e; | |
631 | fnd->level += 1; | |
632 | return 0; | |
633 | } | |
634 | ||
635 | static struct indx_node *fnd_pop(struct ntfs_fnd *fnd) | |
636 | { | |
637 | struct indx_node *n; | |
638 | int i = fnd->level; | |
639 | ||
640 | i -= 1; | |
641 | n = fnd->nodes[i]; | |
642 | fnd->nodes[i] = NULL; | |
643 | fnd->level = i; | |
644 | ||
645 | return n; | |
646 | } | |
647 | ||
648 | static bool fnd_is_empty(struct ntfs_fnd *fnd) | |
649 | { | |
650 | if (!fnd->level) | |
651 | return !fnd->root_de; | |
652 | ||
653 | return !fnd->de[fnd->level - 1]; | |
654 | } | |
655 | ||
656 | /* | |
657 | * hdr_find_e | |
658 | * | |
659 | * locates an entry the index buffer. | |
660 | * If no matching entry is found, it returns the first entry which is greater | |
661 | * than the desired entry If the search key is greater than all the entries the | |
662 | * buffer, it returns the 'end' entry. This function does a binary search of the | |
663 | * current index buffer, for the first entry that is <= to the search value | |
664 | * Returns NULL if error | |
665 | */ | |
666 | static struct NTFS_DE *hdr_find_e(const struct ntfs_index *indx, | |
667 | const struct INDEX_HDR *hdr, const void *key, | |
668 | size_t key_len, const void *ctx, int *diff) | |
669 | { | |
670 | struct NTFS_DE *e; | |
671 | NTFS_CMP_FUNC cmp = indx->cmp; | |
672 | u32 e_size, e_key_len; | |
673 | u32 end = le32_to_cpu(hdr->used); | |
674 | u32 off = le32_to_cpu(hdr->de_off); | |
675 | ||
676 | #ifdef NTFS3_INDEX_BINARY_SEARCH | |
677 | int max_idx = 0, fnd, min_idx; | |
678 | int nslots = 64; | |
679 | u16 *offs; | |
680 | ||
681 | if (end > 0x10000) | |
682 | goto next; | |
683 | ||
684 | offs = ntfs_malloc(sizeof(u16) * nslots); | |
685 | if (!offs) | |
686 | goto next; | |
687 | ||
688 | /* use binary search algorithm */ | |
689 | next1: | |
690 | if (off + sizeof(struct NTFS_DE) > end) { | |
691 | e = NULL; | |
692 | goto out1; | |
693 | } | |
694 | e = Add2Ptr(hdr, off); | |
695 | e_size = le16_to_cpu(e->size); | |
696 | ||
697 | if (e_size < sizeof(struct NTFS_DE) || off + e_size > end) { | |
698 | e = NULL; | |
699 | goto out1; | |
700 | } | |
701 | ||
702 | if (max_idx >= nslots) { | |
703 | u16 *ptr; | |
704 | int new_slots = QuadAlign(2 * nslots); | |
705 | ||
706 | ptr = ntfs_malloc(sizeof(u16) * new_slots); | |
707 | if (ptr) | |
708 | memcpy(ptr, offs, sizeof(u16) * max_idx); | |
709 | ntfs_free(offs); | |
710 | offs = ptr; | |
711 | nslots = new_slots; | |
712 | if (!ptr) | |
713 | goto next; | |
714 | } | |
715 | ||
716 | /* Store entry table */ | |
717 | offs[max_idx] = off; | |
718 | ||
719 | if (!de_is_last(e)) { | |
720 | off += e_size; | |
721 | max_idx += 1; | |
722 | goto next1; | |
723 | } | |
724 | ||
725 | /* | |
726 | * Table of pointers is created | |
727 | * Use binary search to find entry that is <= to the search value | |
728 | */ | |
729 | fnd = -1; | |
730 | min_idx = 0; | |
731 | ||
732 | while (min_idx <= max_idx) { | |
733 | int mid_idx = min_idx + ((max_idx - min_idx) >> 1); | |
734 | int diff2; | |
735 | ||
736 | e = Add2Ptr(hdr, offs[mid_idx]); | |
737 | ||
738 | e_key_len = le16_to_cpu(e->key_size); | |
739 | ||
740 | diff2 = (*cmp)(key, key_len, e + 1, e_key_len, ctx); | |
741 | ||
742 | if (!diff2) { | |
743 | *diff = 0; | |
744 | goto out1; | |
745 | } | |
746 | ||
747 | if (diff2 < 0) { | |
748 | max_idx = mid_idx - 1; | |
749 | fnd = mid_idx; | |
750 | if (!fnd) | |
751 | break; | |
752 | } else { | |
753 | min_idx = mid_idx + 1; | |
754 | } | |
755 | } | |
756 | ||
757 | if (fnd == -1) { | |
758 | e = NULL; | |
759 | goto out1; | |
760 | } | |
761 | ||
762 | *diff = -1; | |
763 | e = Add2Ptr(hdr, offs[fnd]); | |
764 | ||
765 | out1: | |
766 | ntfs_free(offs); | |
767 | ||
768 | return e; | |
769 | #endif | |
770 | ||
771 | next: | |
772 | /* | |
773 | * Entries index are sorted | |
774 | * Enumerate all entries until we find entry that is <= to the search value | |
775 | */ | |
776 | if (off + sizeof(struct NTFS_DE) > end) | |
777 | return NULL; | |
778 | ||
779 | e = Add2Ptr(hdr, off); | |
780 | e_size = le16_to_cpu(e->size); | |
781 | ||
782 | if (e_size < sizeof(struct NTFS_DE) || off + e_size > end) | |
783 | return NULL; | |
784 | ||
785 | off += e_size; | |
786 | ||
787 | e_key_len = le16_to_cpu(e->key_size); | |
788 | ||
789 | *diff = (*cmp)(key, key_len, e + 1, e_key_len, ctx); | |
790 | if (!*diff) | |
791 | return e; | |
792 | ||
793 | if (*diff <= 0) | |
794 | return e; | |
795 | ||
796 | if (de_is_last(e)) { | |
797 | *diff = 1; | |
798 | return e; | |
799 | } | |
800 | goto next; | |
801 | } | |
802 | ||
803 | /* | |
804 | * hdr_insert_de | |
805 | * | |
806 | * inserts an index entry into the buffer. | |
807 | * 'before' should be a pointer previously returned from hdr_find_e | |
808 | */ | |
809 | static struct NTFS_DE *hdr_insert_de(const struct ntfs_index *indx, | |
810 | struct INDEX_HDR *hdr, | |
811 | const struct NTFS_DE *de, | |
812 | struct NTFS_DE *before, const void *ctx) | |
813 | { | |
814 | int diff; | |
815 | size_t off = PtrOffset(hdr, before); | |
816 | u32 used = le32_to_cpu(hdr->used); | |
817 | u32 total = le32_to_cpu(hdr->total); | |
818 | u16 de_size = le16_to_cpu(de->size); | |
819 | ||
820 | /* First, check to see if there's enough room */ | |
821 | if (used + de_size > total) | |
822 | return NULL; | |
823 | ||
824 | /* We know there's enough space, so we know we'll succeed. */ | |
825 | if (before) { | |
826 | /* Check that before is inside Index */ | |
827 | if (off >= used || off < le32_to_cpu(hdr->de_off) || | |
828 | off + le16_to_cpu(before->size) > total) { | |
829 | return NULL; | |
830 | } | |
831 | goto ok; | |
832 | } | |
833 | /* No insert point is applied. Get it manually */ | |
834 | before = hdr_find_e(indx, hdr, de + 1, le16_to_cpu(de->key_size), ctx, | |
835 | &diff); | |
836 | if (!before) | |
837 | return NULL; | |
838 | off = PtrOffset(hdr, before); | |
839 | ||
840 | ok: | |
841 | /* Now we just make room for the entry and jam it in. */ | |
842 | memmove(Add2Ptr(before, de_size), before, used - off); | |
843 | ||
844 | hdr->used = cpu_to_le32(used + de_size); | |
845 | memcpy(before, de, de_size); | |
846 | ||
847 | return before; | |
848 | } | |
849 | ||
850 | /* | |
851 | * hdr_delete_de | |
852 | * | |
853 | * removes an entry from the index buffer | |
854 | */ | |
855 | static inline struct NTFS_DE *hdr_delete_de(struct INDEX_HDR *hdr, | |
856 | struct NTFS_DE *re) | |
857 | { | |
858 | u32 used = le32_to_cpu(hdr->used); | |
859 | u16 esize = le16_to_cpu(re->size); | |
860 | u32 off = PtrOffset(hdr, re); | |
861 | int bytes = used - (off + esize); | |
862 | ||
863 | if (off >= used || esize < sizeof(struct NTFS_DE) || | |
864 | bytes < sizeof(struct NTFS_DE)) | |
865 | return NULL; | |
866 | ||
867 | hdr->used = cpu_to_le32(used - esize); | |
868 | memmove(re, Add2Ptr(re, esize), bytes); | |
869 | ||
870 | return re; | |
871 | } | |
872 | ||
873 | void indx_clear(struct ntfs_index *indx) | |
874 | { | |
875 | run_close(&indx->alloc_run); | |
876 | run_close(&indx->bitmap_run); | |
877 | } | |
878 | ||
879 | int indx_init(struct ntfs_index *indx, struct ntfs_sb_info *sbi, | |
880 | const struct ATTRIB *attr, enum index_mutex_classed type) | |
881 | { | |
882 | u32 t32; | |
883 | const struct INDEX_ROOT *root = resident_data(attr); | |
884 | ||
885 | /* Check root fields */ | |
886 | if (!root->index_block_clst) | |
887 | return -EINVAL; | |
888 | ||
889 | indx->type = type; | |
890 | indx->idx2vbn_bits = __ffs(root->index_block_clst); | |
891 | ||
892 | t32 = le32_to_cpu(root->index_block_size); | |
893 | indx->index_bits = blksize_bits(t32); | |
894 | ||
895 | /* Check index record size */ | |
896 | if (t32 < sbi->cluster_size) { | |
897 | /* index record is smaller than a cluster, use 512 blocks */ | |
898 | if (t32 != root->index_block_clst * SECTOR_SIZE) | |
899 | return -EINVAL; | |
900 | ||
901 | /* Check alignment to a cluster */ | |
902 | if ((sbi->cluster_size >> SECTOR_SHIFT) & | |
903 | (root->index_block_clst - 1)) { | |
904 | return -EINVAL; | |
905 | } | |
906 | ||
907 | indx->vbn2vbo_bits = SECTOR_SHIFT; | |
908 | } else { | |
909 | /* index record must be a multiple of cluster size */ | |
910 | if (t32 != root->index_block_clst << sbi->cluster_bits) | |
911 | return -EINVAL; | |
912 | ||
913 | indx->vbn2vbo_bits = sbi->cluster_bits; | |
914 | } | |
915 | ||
916 | init_rwsem(&indx->run_lock); | |
917 | ||
918 | indx->cmp = get_cmp_func(root); | |
919 | return indx->cmp ? 0 : -EINVAL; | |
920 | } | |
921 | ||
922 | static struct indx_node *indx_new(struct ntfs_index *indx, | |
923 | struct ntfs_inode *ni, CLST vbn, | |
924 | const __le64 *sub_vbn) | |
925 | { | |
926 | int err; | |
927 | struct NTFS_DE *e; | |
928 | struct indx_node *r; | |
929 | struct INDEX_HDR *hdr; | |
930 | struct INDEX_BUFFER *index; | |
931 | u64 vbo = (u64)vbn << indx->vbn2vbo_bits; | |
932 | u32 bytes = 1u << indx->index_bits; | |
933 | u16 fn; | |
934 | u32 eo; | |
935 | ||
936 | r = ntfs_zalloc(sizeof(struct indx_node)); | |
937 | if (!r) | |
938 | return ERR_PTR(-ENOMEM); | |
939 | ||
940 | index = ntfs_zalloc(bytes); | |
941 | if (!index) { | |
942 | ntfs_free(r); | |
943 | return ERR_PTR(-ENOMEM); | |
944 | } | |
945 | ||
946 | err = ntfs_get_bh(ni->mi.sbi, &indx->alloc_run, vbo, bytes, &r->nb); | |
947 | ||
948 | if (err) { | |
949 | ntfs_free(index); | |
950 | ntfs_free(r); | |
951 | return ERR_PTR(err); | |
952 | } | |
953 | ||
954 | /* Create header */ | |
955 | index->rhdr.sign = NTFS_INDX_SIGNATURE; | |
956 | index->rhdr.fix_off = cpu_to_le16(sizeof(struct INDEX_BUFFER)); // 0x28 | |
957 | fn = (bytes >> SECTOR_SHIFT) + 1; // 9 | |
958 | index->rhdr.fix_num = cpu_to_le16(fn); | |
959 | index->vbn = cpu_to_le64(vbn); | |
960 | hdr = &index->ihdr; | |
961 | eo = QuadAlign(sizeof(struct INDEX_BUFFER) + fn * sizeof(short)); | |
962 | hdr->de_off = cpu_to_le32(eo); | |
963 | ||
964 | e = Add2Ptr(hdr, eo); | |
965 | ||
966 | if (sub_vbn) { | |
967 | e->flags = NTFS_IE_LAST | NTFS_IE_HAS_SUBNODES; | |
968 | e->size = cpu_to_le16(sizeof(struct NTFS_DE) + sizeof(u64)); | |
969 | hdr->used = | |
970 | cpu_to_le32(eo + sizeof(struct NTFS_DE) + sizeof(u64)); | |
971 | de_set_vbn_le(e, *sub_vbn); | |
972 | hdr->flags = 1; | |
973 | } else { | |
974 | e->size = cpu_to_le16(sizeof(struct NTFS_DE)); | |
975 | hdr->used = cpu_to_le32(eo + sizeof(struct NTFS_DE)); | |
976 | e->flags = NTFS_IE_LAST; | |
977 | } | |
978 | ||
979 | hdr->total = cpu_to_le32(bytes - offsetof(struct INDEX_BUFFER, ihdr)); | |
980 | ||
981 | r->index = index; | |
982 | return r; | |
983 | } | |
984 | ||
985 | struct INDEX_ROOT *indx_get_root(struct ntfs_index *indx, struct ntfs_inode *ni, | |
986 | struct ATTRIB **attr, struct mft_inode **mi) | |
987 | { | |
988 | struct ATTR_LIST_ENTRY *le = NULL; | |
989 | struct ATTRIB *a; | |
990 | const struct INDEX_NAMES *in = &s_index_names[indx->type]; | |
991 | ||
992 | a = ni_find_attr(ni, NULL, &le, ATTR_ROOT, in->name, in->name_len, NULL, | |
993 | mi); | |
994 | if (!a) | |
995 | return NULL; | |
996 | ||
997 | if (attr) | |
998 | *attr = a; | |
999 | ||
1000 | return resident_data_ex(a, sizeof(struct INDEX_ROOT)); | |
1001 | } | |
1002 | ||
1003 | static int indx_write(struct ntfs_index *indx, struct ntfs_inode *ni, | |
1004 | struct indx_node *node, int sync) | |
1005 | { | |
1006 | struct INDEX_BUFFER *ib = node->index; | |
1007 | ||
1008 | return ntfs_write_bh(ni->mi.sbi, &ib->rhdr, &node->nb, sync); | |
1009 | } | |
1010 | ||
1011 | /* | |
1012 | * if ntfs_readdir calls this function | |
1013 | * inode is shared locked and no ni_lock | |
1014 | * use rw_semaphore for read/write access to alloc_run | |
1015 | */ | |
1016 | int indx_read(struct ntfs_index *indx, struct ntfs_inode *ni, CLST vbn, | |
1017 | struct indx_node **node) | |
1018 | { | |
1019 | int err; | |
1020 | struct INDEX_BUFFER *ib; | |
1021 | struct runs_tree *run = &indx->alloc_run; | |
1022 | struct rw_semaphore *lock = &indx->run_lock; | |
1023 | u64 vbo = (u64)vbn << indx->vbn2vbo_bits; | |
1024 | u32 bytes = 1u << indx->index_bits; | |
1025 | struct indx_node *in = *node; | |
1026 | const struct INDEX_NAMES *name; | |
1027 | ||
1028 | if (!in) { | |
1029 | in = ntfs_zalloc(sizeof(struct indx_node)); | |
1030 | if (!in) | |
1031 | return -ENOMEM; | |
1032 | } else { | |
1033 | nb_put(&in->nb); | |
1034 | } | |
1035 | ||
1036 | ib = in->index; | |
1037 | if (!ib) { | |
1038 | ib = ntfs_malloc(bytes); | |
1039 | if (!ib) { | |
1040 | err = -ENOMEM; | |
1041 | goto out; | |
1042 | } | |
1043 | } | |
1044 | ||
1045 | down_read(lock); | |
1046 | err = ntfs_read_bh(ni->mi.sbi, run, vbo, &ib->rhdr, bytes, &in->nb); | |
1047 | up_read(lock); | |
1048 | if (!err) | |
1049 | goto ok; | |
1050 | ||
1051 | if (err == -E_NTFS_FIXUP) | |
1052 | goto ok; | |
1053 | ||
1054 | if (err != -ENOENT) | |
1055 | goto out; | |
1056 | ||
1057 | name = &s_index_names[indx->type]; | |
1058 | down_write(lock); | |
1059 | err = attr_load_runs_range(ni, ATTR_ALLOC, name->name, name->name_len, | |
1060 | run, vbo, vbo + bytes); | |
1061 | up_write(lock); | |
1062 | if (err) | |
1063 | goto out; | |
1064 | ||
1065 | down_read(lock); | |
1066 | err = ntfs_read_bh(ni->mi.sbi, run, vbo, &ib->rhdr, bytes, &in->nb); | |
1067 | up_read(lock); | |
1068 | if (err == -E_NTFS_FIXUP) | |
1069 | goto ok; | |
1070 | ||
1071 | if (err) | |
1072 | goto out; | |
1073 | ||
1074 | ok: | |
1075 | if (err == -E_NTFS_FIXUP) { | |
1076 | ntfs_write_bh(ni->mi.sbi, &ib->rhdr, &in->nb, 0); | |
1077 | err = 0; | |
1078 | } | |
1079 | ||
1080 | in->index = ib; | |
1081 | *node = in; | |
1082 | ||
1083 | out: | |
1084 | if (ib != in->index) | |
1085 | ntfs_free(ib); | |
1086 | ||
1087 | if (*node != in) { | |
1088 | nb_put(&in->nb); | |
1089 | ntfs_free(in); | |
1090 | } | |
1091 | ||
1092 | return err; | |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * indx_find | |
1097 | * | |
1098 | * scans NTFS directory for given entry | |
1099 | */ | |
1100 | int indx_find(struct ntfs_index *indx, struct ntfs_inode *ni, | |
1101 | const struct INDEX_ROOT *root, const void *key, size_t key_len, | |
1102 | const void *ctx, int *diff, struct NTFS_DE **entry, | |
1103 | struct ntfs_fnd *fnd) | |
1104 | { | |
1105 | int err; | |
1106 | struct NTFS_DE *e; | |
1107 | const struct INDEX_HDR *hdr; | |
1108 | struct indx_node *node; | |
1109 | ||
1110 | if (!root) | |
1111 | root = indx_get_root(&ni->dir, ni, NULL, NULL); | |
1112 | ||
1113 | if (!root) { | |
1114 | err = -EINVAL; | |
1115 | goto out; | |
1116 | } | |
1117 | ||
1118 | hdr = &root->ihdr; | |
1119 | ||
1120 | /* Check cache */ | |
1121 | e = fnd->level ? fnd->de[fnd->level - 1] : fnd->root_de; | |
1122 | if (e && !de_is_last(e) && | |
1123 | !(*indx->cmp)(key, key_len, e + 1, le16_to_cpu(e->key_size), ctx)) { | |
1124 | *entry = e; | |
1125 | *diff = 0; | |
1126 | return 0; | |
1127 | } | |
1128 | ||
1129 | /* Soft finder reset */ | |
1130 | fnd_clear(fnd); | |
1131 | ||
1132 | /* Lookup entry that is <= to the search value */ | |
1133 | e = hdr_find_e(indx, hdr, key, key_len, ctx, diff); | |
1134 | if (!e) | |
1135 | return -EINVAL; | |
1136 | ||
1137 | if (fnd) | |
1138 | fnd->root_de = e; | |
1139 | ||
1140 | err = 0; | |
1141 | ||
1142 | for (;;) { | |
1143 | node = NULL; | |
1144 | if (*diff >= 0 || !de_has_vcn_ex(e)) { | |
1145 | *entry = e; | |
1146 | goto out; | |
1147 | } | |
1148 | ||
1149 | /* Read next level. */ | |
1150 | err = indx_read(indx, ni, de_get_vbn(e), &node); | |
1151 | if (err) | |
1152 | goto out; | |
1153 | ||
1154 | /* Lookup entry that is <= to the search value */ | |
1155 | e = hdr_find_e(indx, &node->index->ihdr, key, key_len, ctx, | |
1156 | diff); | |
1157 | if (!e) { | |
1158 | err = -EINVAL; | |
1159 | put_indx_node(node); | |
1160 | goto out; | |
1161 | } | |
1162 | ||
1163 | fnd_push(fnd, node, e); | |
1164 | } | |
1165 | ||
1166 | out: | |
1167 | return err; | |
1168 | } | |
1169 | ||
1170 | int indx_find_sort(struct ntfs_index *indx, struct ntfs_inode *ni, | |
1171 | const struct INDEX_ROOT *root, struct NTFS_DE **entry, | |
1172 | struct ntfs_fnd *fnd) | |
1173 | { | |
1174 | int err; | |
1175 | struct indx_node *n = NULL; | |
1176 | struct NTFS_DE *e; | |
1177 | size_t iter = 0; | |
1178 | int level = fnd->level; | |
1179 | ||
1180 | if (!*entry) { | |
1181 | /* Start find */ | |
1182 | e = hdr_first_de(&root->ihdr); | |
1183 | if (!e) | |
1184 | return 0; | |
1185 | fnd_clear(fnd); | |
1186 | fnd->root_de = e; | |
1187 | } else if (!level) { | |
1188 | if (de_is_last(fnd->root_de)) { | |
1189 | *entry = NULL; | |
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | e = hdr_next_de(&root->ihdr, fnd->root_de); | |
1194 | if (!e) | |
1195 | return -EINVAL; | |
1196 | fnd->root_de = e; | |
1197 | } else { | |
1198 | n = fnd->nodes[level - 1]; | |
1199 | e = fnd->de[level - 1]; | |
1200 | ||
1201 | if (de_is_last(e)) | |
1202 | goto pop_level; | |
1203 | ||
1204 | e = hdr_next_de(&n->index->ihdr, e); | |
1205 | if (!e) | |
1206 | return -EINVAL; | |
1207 | ||
1208 | fnd->de[level - 1] = e; | |
1209 | } | |
1210 | ||
1211 | /* Just to avoid tree cycle */ | |
1212 | next_iter: | |
1213 | if (iter++ >= 1000) | |
1214 | return -EINVAL; | |
1215 | ||
1216 | while (de_has_vcn_ex(e)) { | |
1217 | if (le16_to_cpu(e->size) < | |
1218 | sizeof(struct NTFS_DE) + sizeof(u64)) { | |
1219 | if (n) { | |
1220 | fnd_pop(fnd); | |
1221 | ntfs_free(n); | |
1222 | } | |
1223 | return -EINVAL; | |
1224 | } | |
1225 | ||
1226 | /* Read next level */ | |
1227 | err = indx_read(indx, ni, de_get_vbn(e), &n); | |
1228 | if (err) | |
1229 | return err; | |
1230 | ||
1231 | /* Try next level */ | |
1232 | e = hdr_first_de(&n->index->ihdr); | |
1233 | if (!e) { | |
1234 | ntfs_free(n); | |
1235 | return -EINVAL; | |
1236 | } | |
1237 | ||
1238 | fnd_push(fnd, n, e); | |
1239 | } | |
1240 | ||
1241 | if (le16_to_cpu(e->size) > sizeof(struct NTFS_DE)) { | |
1242 | *entry = e; | |
1243 | return 0; | |
1244 | } | |
1245 | ||
1246 | pop_level: | |
1247 | for (;;) { | |
1248 | if (!de_is_last(e)) | |
1249 | goto next_iter; | |
1250 | ||
1251 | /* Pop one level */ | |
1252 | if (n) { | |
1253 | fnd_pop(fnd); | |
1254 | ntfs_free(n); | |
1255 | } | |
1256 | ||
1257 | level = fnd->level; | |
1258 | ||
1259 | if (level) { | |
1260 | n = fnd->nodes[level - 1]; | |
1261 | e = fnd->de[level - 1]; | |
1262 | } else if (fnd->root_de) { | |
1263 | n = NULL; | |
1264 | e = fnd->root_de; | |
1265 | fnd->root_de = NULL; | |
1266 | } else { | |
1267 | *entry = NULL; | |
1268 | return 0; | |
1269 | } | |
1270 | ||
1271 | if (le16_to_cpu(e->size) > sizeof(struct NTFS_DE)) { | |
1272 | *entry = e; | |
1273 | if (!fnd->root_de) | |
1274 | fnd->root_de = e; | |
1275 | return 0; | |
1276 | } | |
1277 | } | |
1278 | } | |
1279 | ||
1280 | int indx_find_raw(struct ntfs_index *indx, struct ntfs_inode *ni, | |
1281 | const struct INDEX_ROOT *root, struct NTFS_DE **entry, | |
1282 | size_t *off, struct ntfs_fnd *fnd) | |
1283 | { | |
1284 | int err; | |
1285 | struct indx_node *n = NULL; | |
1286 | struct NTFS_DE *e = NULL; | |
1287 | struct NTFS_DE *e2; | |
1288 | size_t bit; | |
1289 | CLST next_used_vbn; | |
1290 | CLST next_vbn; | |
1291 | u32 record_size = ni->mi.sbi->record_size; | |
1292 | ||
1293 | /* Use non sorted algorithm */ | |
1294 | if (!*entry) { | |
1295 | /* This is the first call */ | |
1296 | e = hdr_first_de(&root->ihdr); | |
1297 | if (!e) | |
1298 | return 0; | |
1299 | fnd_clear(fnd); | |
1300 | fnd->root_de = e; | |
1301 | ||
1302 | /* The first call with setup of initial element */ | |
1303 | if (*off >= record_size) { | |
1304 | next_vbn = (((*off - record_size) >> indx->index_bits)) | |
1305 | << indx->idx2vbn_bits; | |
1306 | /* jump inside cycle 'for'*/ | |
1307 | goto next; | |
1308 | } | |
1309 | ||
1310 | /* Start enumeration from root */ | |
1311 | *off = 0; | |
1312 | } else if (!fnd->root_de) | |
1313 | return -EINVAL; | |
1314 | ||
1315 | for (;;) { | |
1316 | /* Check if current entry can be used */ | |
1317 | if (e && le16_to_cpu(e->size) > sizeof(struct NTFS_DE)) | |
1318 | goto ok; | |
1319 | ||
1320 | if (!fnd->level) { | |
1321 | /* Continue to enumerate root */ | |
1322 | if (!de_is_last(fnd->root_de)) { | |
1323 | e = hdr_next_de(&root->ihdr, fnd->root_de); | |
1324 | if (!e) | |
1325 | return -EINVAL; | |
1326 | fnd->root_de = e; | |
1327 | continue; | |
1328 | } | |
1329 | ||
1330 | /* Start to enumerate indexes from 0 */ | |
1331 | next_vbn = 0; | |
1332 | } else { | |
1333 | /* Continue to enumerate indexes */ | |
1334 | e2 = fnd->de[fnd->level - 1]; | |
1335 | ||
1336 | n = fnd->nodes[fnd->level - 1]; | |
1337 | ||
1338 | if (!de_is_last(e2)) { | |
1339 | e = hdr_next_de(&n->index->ihdr, e2); | |
1340 | if (!e) | |
1341 | return -EINVAL; | |
1342 | fnd->de[fnd->level - 1] = e; | |
1343 | continue; | |
1344 | } | |
1345 | ||
1346 | /* Continue with next index */ | |
1347 | next_vbn = le64_to_cpu(n->index->vbn) + | |
1348 | root->index_block_clst; | |
1349 | } | |
1350 | ||
1351 | next: | |
1352 | /* Release current index */ | |
1353 | if (n) { | |
1354 | fnd_pop(fnd); | |
1355 | put_indx_node(n); | |
1356 | n = NULL; | |
1357 | } | |
1358 | ||
1359 | /* Skip all free indexes */ | |
1360 | bit = next_vbn >> indx->idx2vbn_bits; | |
1361 | err = indx_used_bit(indx, ni, &bit); | |
1362 | if (err == -ENOENT || bit == MINUS_ONE_T) { | |
1363 | /* No used indexes */ | |
1364 | *entry = NULL; | |
1365 | return 0; | |
1366 | } | |
1367 | ||
1368 | next_used_vbn = bit << indx->idx2vbn_bits; | |
1369 | ||
1370 | /* Read buffer into memory */ | |
1371 | err = indx_read(indx, ni, next_used_vbn, &n); | |
1372 | if (err) | |
1373 | return err; | |
1374 | ||
1375 | e = hdr_first_de(&n->index->ihdr); | |
1376 | fnd_push(fnd, n, e); | |
1377 | if (!e) | |
1378 | return -EINVAL; | |
1379 | } | |
1380 | ||
1381 | ok: | |
1382 | /* return offset to restore enumerator if necessary */ | |
1383 | if (!n) { | |
1384 | /* 'e' points in root */ | |
1385 | *off = PtrOffset(&root->ihdr, e); | |
1386 | } else { | |
1387 | /* 'e' points in index */ | |
1388 | *off = (le64_to_cpu(n->index->vbn) << indx->vbn2vbo_bits) + | |
1389 | record_size + PtrOffset(&n->index->ihdr, e); | |
1390 | } | |
1391 | ||
1392 | *entry = e; | |
1393 | return 0; | |
1394 | } | |
1395 | ||
1396 | /* | |
1397 | * indx_create_allocate | |
1398 | * | |
1399 | * create "Allocation + Bitmap" attributes | |
1400 | */ | |
1401 | static int indx_create_allocate(struct ntfs_index *indx, struct ntfs_inode *ni, | |
1402 | CLST *vbn) | |
1403 | { | |
1404 | int err = -ENOMEM; | |
1405 | struct ntfs_sb_info *sbi = ni->mi.sbi; | |
1406 | struct ATTRIB *bitmap; | |
1407 | struct ATTRIB *alloc; | |
1408 | u32 data_size = 1u << indx->index_bits; | |
1409 | u32 alloc_size = ntfs_up_cluster(sbi, data_size); | |
1410 | CLST len = alloc_size >> sbi->cluster_bits; | |
1411 | const struct INDEX_NAMES *in = &s_index_names[indx->type]; | |
1412 | CLST alen; | |
1413 | struct runs_tree run; | |
1414 | ||
1415 | run_init(&run); | |
1416 | ||
1417 | err = attr_allocate_clusters(sbi, &run, 0, 0, len, NULL, 0, &alen, 0, | |
1418 | NULL); | |
1419 | if (err) | |
1420 | goto out; | |
1421 | ||
1422 | err = ni_insert_nonresident(ni, ATTR_ALLOC, in->name, in->name_len, | |
1423 | &run, 0, len, 0, &alloc, NULL); | |
1424 | if (err) | |
1425 | goto out1; | |
1426 | ||
1427 | alloc->nres.valid_size = alloc->nres.data_size = cpu_to_le64(data_size); | |
1428 | ||
1429 | err = ni_insert_resident(ni, bitmap_size(1), ATTR_BITMAP, in->name, | |
1430 | in->name_len, &bitmap, NULL); | |
1431 | if (err) | |
1432 | goto out2; | |
1433 | ||
1434 | if (in->name == I30_NAME) { | |
1435 | ni->vfs_inode.i_size = data_size; | |
1436 | inode_set_bytes(&ni->vfs_inode, alloc_size); | |
1437 | } | |
1438 | ||
1439 | memcpy(&indx->alloc_run, &run, sizeof(run)); | |
1440 | ||
1441 | *vbn = 0; | |
1442 | ||
1443 | return 0; | |
1444 | ||
1445 | out2: | |
1446 | mi_remove_attr(&ni->mi, alloc); | |
1447 | ||
1448 | out1: | |
1449 | run_deallocate(sbi, &run, false); | |
1450 | ||
1451 | out: | |
1452 | return err; | |
1453 | } | |
1454 | ||
1455 | /* | |
1456 | * indx_add_allocate | |
1457 | * | |
1458 | * add clusters to index | |
1459 | */ | |
1460 | static int indx_add_allocate(struct ntfs_index *indx, struct ntfs_inode *ni, | |
1461 | CLST *vbn) | |
1462 | { | |
1463 | int err; | |
1464 | size_t bit; | |
1465 | u64 data_size; | |
1466 | u64 bmp_size, bmp_size_v; | |
1467 | struct ATTRIB *bmp, *alloc; | |
1468 | struct mft_inode *mi; | |
1469 | const struct INDEX_NAMES *in = &s_index_names[indx->type]; | |
1470 | ||
1471 | err = indx_find_free(indx, ni, &bit, &bmp); | |
1472 | if (err) | |
1473 | goto out1; | |
1474 | ||
1475 | if (bit != MINUS_ONE_T) { | |
1476 | bmp = NULL; | |
1477 | } else { | |
1478 | if (bmp->non_res) { | |
1479 | bmp_size = le64_to_cpu(bmp->nres.data_size); | |
1480 | bmp_size_v = le64_to_cpu(bmp->nres.valid_size); | |
1481 | } else { | |
1482 | bmp_size = bmp_size_v = le32_to_cpu(bmp->res.data_size); | |
1483 | } | |
1484 | ||
1485 | bit = bmp_size << 3; | |
1486 | } | |
1487 | ||
1488 | data_size = (u64)(bit + 1) << indx->index_bits; | |
1489 | ||
1490 | if (bmp) { | |
1491 | /* Increase bitmap */ | |
1492 | err = attr_set_size(ni, ATTR_BITMAP, in->name, in->name_len, | |
1493 | &indx->bitmap_run, bitmap_size(bit + 1), | |
1494 | NULL, true, NULL); | |
1495 | if (err) | |
1496 | goto out1; | |
1497 | } | |
1498 | ||
1499 | alloc = ni_find_attr(ni, NULL, NULL, ATTR_ALLOC, in->name, in->name_len, | |
1500 | NULL, &mi); | |
1501 | if (!alloc) { | |
1502 | if (bmp) | |
1503 | goto out2; | |
1504 | goto out1; | |
1505 | } | |
1506 | ||
1507 | /* Increase allocation */ | |
1508 | err = attr_set_size(ni, ATTR_ALLOC, in->name, in->name_len, | |
1509 | &indx->alloc_run, data_size, &data_size, true, | |
1510 | NULL); | |
1511 | if (err) { | |
1512 | if (bmp) | |
1513 | goto out2; | |
1514 | goto out1; | |
1515 | } | |
1516 | ||
1517 | *vbn = bit << indx->idx2vbn_bits; | |
1518 | ||
1519 | return 0; | |
1520 | ||
1521 | out2: | |
1522 | /* Ops (no space?) */ | |
1523 | attr_set_size(ni, ATTR_BITMAP, in->name, in->name_len, | |
1524 | &indx->bitmap_run, bmp_size, &bmp_size_v, false, NULL); | |
1525 | ||
1526 | out1: | |
1527 | return err; | |
1528 | } | |
1529 | ||
1530 | /* | |
1531 | * indx_insert_into_root | |
1532 | * | |
1533 | * attempts to insert an entry into the index root | |
1534 | * If necessary, it will twiddle the index b-tree. | |
1535 | */ | |
1536 | static int indx_insert_into_root(struct ntfs_index *indx, struct ntfs_inode *ni, | |
1537 | const struct NTFS_DE *new_de, | |
1538 | struct NTFS_DE *root_de, const void *ctx, | |
1539 | struct ntfs_fnd *fnd) | |
1540 | { | |
1541 | int err = 0; | |
1542 | struct NTFS_DE *e, *e0, *re; | |
1543 | struct mft_inode *mi; | |
1544 | struct ATTRIB *attr; | |
1545 | struct MFT_REC *rec; | |
1546 | struct INDEX_HDR *hdr; | |
1547 | struct indx_node *n; | |
1548 | CLST new_vbn; | |
1549 | __le64 *sub_vbn, t_vbn; | |
1550 | u16 new_de_size; | |
1551 | u32 hdr_used, hdr_total, asize, used, to_move; | |
1552 | u32 root_size, new_root_size; | |
1553 | struct ntfs_sb_info *sbi; | |
1554 | int ds_root; | |
1555 | struct INDEX_ROOT *root, *a_root = NULL; | |
1556 | ||
1557 | /* Get the record this root placed in */ | |
1558 | root = indx_get_root(indx, ni, &attr, &mi); | |
1559 | if (!root) | |
1560 | goto out; | |
1561 | ||
1562 | /* | |
1563 | * Try easy case: | |
1564 | * hdr_insert_de will succeed if there's room the root for the new entry. | |
1565 | */ | |
1566 | hdr = &root->ihdr; | |
1567 | sbi = ni->mi.sbi; | |
1568 | rec = mi->mrec; | |
1569 | used = le32_to_cpu(rec->used); | |
1570 | new_de_size = le16_to_cpu(new_de->size); | |
1571 | hdr_used = le32_to_cpu(hdr->used); | |
1572 | hdr_total = le32_to_cpu(hdr->total); | |
1573 | asize = le32_to_cpu(attr->size); | |
1574 | root_size = le32_to_cpu(attr->res.data_size); | |
1575 | ||
1576 | ds_root = new_de_size + hdr_used - hdr_total; | |
1577 | ||
1578 | if (used + ds_root < sbi->max_bytes_per_attr) { | |
1579 | /* make a room for new elements */ | |
1580 | mi_resize_attr(mi, attr, ds_root); | |
1581 | hdr->total = cpu_to_le32(hdr_total + ds_root); | |
1582 | e = hdr_insert_de(indx, hdr, new_de, root_de, ctx); | |
1583 | WARN_ON(!e); | |
1584 | fnd_clear(fnd); | |
1585 | fnd->root_de = e; | |
1586 | ||
1587 | return 0; | |
1588 | } | |
1589 | ||
1590 | /* Make a copy of root attribute to restore if error */ | |
1591 | a_root = ntfs_memdup(attr, asize); | |
1592 | if (!a_root) { | |
1593 | err = -ENOMEM; | |
1594 | goto out; | |
1595 | } | |
1596 | ||
1597 | /* copy all the non-end entries from the index root to the new buffer.*/ | |
1598 | to_move = 0; | |
1599 | e0 = hdr_first_de(hdr); | |
1600 | ||
1601 | /* Calculate the size to copy */ | |
1602 | for (e = e0;; e = hdr_next_de(hdr, e)) { | |
1603 | if (!e) { | |
1604 | err = -EINVAL; | |
1605 | goto out; | |
1606 | } | |
1607 | ||
1608 | if (de_is_last(e)) | |
1609 | break; | |
1610 | to_move += le16_to_cpu(e->size); | |
1611 | } | |
1612 | ||
1613 | n = NULL; | |
1614 | if (!to_move) { | |
1615 | re = NULL; | |
1616 | } else { | |
1617 | re = ntfs_memdup(e0, to_move); | |
1618 | if (!re) { | |
1619 | err = -ENOMEM; | |
1620 | goto out; | |
1621 | } | |
1622 | } | |
1623 | ||
1624 | sub_vbn = NULL; | |
1625 | if (de_has_vcn(e)) { | |
1626 | t_vbn = de_get_vbn_le(e); | |
1627 | sub_vbn = &t_vbn; | |
1628 | } | |
1629 | ||
1630 | new_root_size = sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE) + | |
1631 | sizeof(u64); | |
1632 | ds_root = new_root_size - root_size; | |
1633 | ||
1634 | if (ds_root > 0 && used + ds_root > sbi->max_bytes_per_attr) { | |
1635 | /* make root external */ | |
1636 | err = -EOPNOTSUPP; | |
1637 | goto out; | |
1638 | } | |
1639 | ||
1640 | if (ds_root) | |
1641 | mi_resize_attr(mi, attr, ds_root); | |
1642 | ||
1643 | /* Fill first entry (vcn will be set later) */ | |
1644 | e = (struct NTFS_DE *)(root + 1); | |
1645 | memset(e, 0, sizeof(struct NTFS_DE)); | |
1646 | e->size = cpu_to_le16(sizeof(struct NTFS_DE) + sizeof(u64)); | |
1647 | e->flags = NTFS_IE_HAS_SUBNODES | NTFS_IE_LAST; | |
1648 | ||
1649 | hdr->flags = 1; | |
1650 | hdr->used = hdr->total = | |
1651 | cpu_to_le32(new_root_size - offsetof(struct INDEX_ROOT, ihdr)); | |
1652 | ||
1653 | fnd->root_de = hdr_first_de(hdr); | |
1654 | mi->dirty = true; | |
1655 | ||
1656 | /* Create alloc and bitmap attributes (if not) */ | |
1657 | err = run_is_empty(&indx->alloc_run) | |
1658 | ? indx_create_allocate(indx, ni, &new_vbn) | |
1659 | : indx_add_allocate(indx, ni, &new_vbn); | |
1660 | ||
1661 | /* layout of record may be changed, so rescan root */ | |
1662 | root = indx_get_root(indx, ni, &attr, &mi); | |
1663 | if (!root) { | |
1664 | /* bug? */ | |
1665 | ntfs_set_state(sbi, NTFS_DIRTY_ERROR); | |
1666 | err = -EINVAL; | |
1667 | goto out1; | |
1668 | } | |
1669 | ||
1670 | if (err) { | |
1671 | /* restore root */ | |
1672 | if (mi_resize_attr(mi, attr, -ds_root)) | |
1673 | memcpy(attr, a_root, asize); | |
1674 | else { | |
1675 | /* bug? */ | |
1676 | ntfs_set_state(sbi, NTFS_DIRTY_ERROR); | |
1677 | } | |
1678 | goto out1; | |
1679 | } | |
1680 | ||
1681 | e = (struct NTFS_DE *)(root + 1); | |
1682 | *(__le64 *)(e + 1) = cpu_to_le64(new_vbn); | |
1683 | mi->dirty = true; | |
1684 | ||
1685 | /* now we can create/format the new buffer and copy the entries into */ | |
1686 | n = indx_new(indx, ni, new_vbn, sub_vbn); | |
1687 | if (IS_ERR(n)) { | |
1688 | err = PTR_ERR(n); | |
1689 | goto out1; | |
1690 | } | |
1691 | ||
1692 | hdr = &n->index->ihdr; | |
1693 | hdr_used = le32_to_cpu(hdr->used); | |
1694 | hdr_total = le32_to_cpu(hdr->total); | |
1695 | ||
1696 | /* Copy root entries into new buffer */ | |
1697 | hdr_insert_head(hdr, re, to_move); | |
1698 | ||
1699 | /* Update bitmap attribute */ | |
1700 | indx_mark_used(indx, ni, new_vbn >> indx->idx2vbn_bits); | |
1701 | ||
1702 | /* Check if we can insert new entry new index buffer */ | |
1703 | if (hdr_used + new_de_size > hdr_total) { | |
1704 | /* | |
1705 | * This occurs if mft record is the same or bigger than index | |
1706 | * buffer. Move all root new index and have no space to add | |
1707 | * new entry classic case when mft record is 1K and index | |
1708 | * buffer 4K the problem should not occurs | |
1709 | */ | |
1710 | ntfs_free(re); | |
1711 | indx_write(indx, ni, n, 0); | |
1712 | ||
1713 | put_indx_node(n); | |
1714 | fnd_clear(fnd); | |
1715 | err = indx_insert_entry(indx, ni, new_de, ctx, fnd); | |
1716 | goto out; | |
1717 | } | |
1718 | ||
1719 | /* | |
1720 | * Now root is a parent for new index buffer | |
1721 | * Insert NewEntry a new buffer | |
1722 | */ | |
1723 | e = hdr_insert_de(indx, hdr, new_de, NULL, ctx); | |
1724 | if (!e) { | |
1725 | err = -EINVAL; | |
1726 | goto out1; | |
1727 | } | |
1728 | fnd_push(fnd, n, e); | |
1729 | ||
1730 | /* Just write updates index into disk */ | |
1731 | indx_write(indx, ni, n, 0); | |
1732 | ||
1733 | n = NULL; | |
1734 | ||
1735 | out1: | |
1736 | ntfs_free(re); | |
1737 | if (n) | |
1738 | put_indx_node(n); | |
1739 | ||
1740 | out: | |
1741 | ntfs_free(a_root); | |
1742 | return err; | |
1743 | } | |
1744 | ||
1745 | /* | |
1746 | * indx_insert_into_buffer | |
1747 | * | |
1748 | * attempts to insert an entry into an Index Allocation Buffer. | |
1749 | * If necessary, it will split the buffer. | |
1750 | */ | |
1751 | static int | |
1752 | indx_insert_into_buffer(struct ntfs_index *indx, struct ntfs_inode *ni, | |
1753 | struct INDEX_ROOT *root, const struct NTFS_DE *new_de, | |
1754 | const void *ctx, int level, struct ntfs_fnd *fnd) | |
1755 | { | |
1756 | int err; | |
1757 | const struct NTFS_DE *sp; | |
1758 | struct NTFS_DE *e, *de_t, *up_e = NULL; | |
1759 | struct indx_node *n2 = NULL; | |
1760 | struct indx_node *n1 = fnd->nodes[level]; | |
1761 | struct INDEX_HDR *hdr1 = &n1->index->ihdr; | |
1762 | struct INDEX_HDR *hdr2; | |
1763 | u32 to_copy, used; | |
1764 | CLST new_vbn; | |
1765 | __le64 t_vbn, *sub_vbn; | |
1766 | u16 sp_size; | |
1767 | ||
1768 | /* Try the most easy case */ | |
1769 | e = fnd->level - 1 == level ? fnd->de[level] : NULL; | |
1770 | e = hdr_insert_de(indx, hdr1, new_de, e, ctx); | |
1771 | fnd->de[level] = e; | |
1772 | if (e) { | |
1773 | /* Just write updated index into disk */ | |
1774 | indx_write(indx, ni, n1, 0); | |
1775 | return 0; | |
1776 | } | |
1777 | ||
1778 | /* | |
1779 | * No space to insert into buffer. Split it. | |
1780 | * To split we: | |
1781 | * - Save split point ('cause index buffers will be changed) | |
1782 | * - Allocate NewBuffer and copy all entries <= sp into new buffer | |
1783 | * - Remove all entries (sp including) from TargetBuffer | |
1784 | * - Insert NewEntry into left or right buffer (depending on sp <=> | |
1785 | * NewEntry) | |
1786 | * - Insert sp into parent buffer (or root) | |
1787 | * - Make sp a parent for new buffer | |
1788 | */ | |
1789 | sp = hdr_find_split(hdr1); | |
1790 | if (!sp) | |
1791 | return -EINVAL; | |
1792 | ||
1793 | sp_size = le16_to_cpu(sp->size); | |
1794 | up_e = ntfs_malloc(sp_size + sizeof(u64)); | |
1795 | if (!up_e) | |
1796 | return -ENOMEM; | |
1797 | memcpy(up_e, sp, sp_size); | |
1798 | ||
1799 | if (!hdr1->flags) { | |
1800 | up_e->flags |= NTFS_IE_HAS_SUBNODES; | |
1801 | up_e->size = cpu_to_le16(sp_size + sizeof(u64)); | |
1802 | sub_vbn = NULL; | |
1803 | } else { | |
1804 | t_vbn = de_get_vbn_le(up_e); | |
1805 | sub_vbn = &t_vbn; | |
1806 | } | |
1807 | ||
1808 | /* Allocate on disk a new index allocation buffer. */ | |
1809 | err = indx_add_allocate(indx, ni, &new_vbn); | |
1810 | if (err) | |
1811 | goto out; | |
1812 | ||
1813 | /* Allocate and format memory a new index buffer */ | |
1814 | n2 = indx_new(indx, ni, new_vbn, sub_vbn); | |
1815 | if (IS_ERR(n2)) { | |
1816 | err = PTR_ERR(n2); | |
1817 | goto out; | |
1818 | } | |
1819 | ||
1820 | hdr2 = &n2->index->ihdr; | |
1821 | ||
1822 | /* Make sp a parent for new buffer */ | |
1823 | de_set_vbn(up_e, new_vbn); | |
1824 | ||
1825 | /* copy all the entries <= sp into the new buffer. */ | |
1826 | de_t = hdr_first_de(hdr1); | |
1827 | to_copy = PtrOffset(de_t, sp); | |
1828 | hdr_insert_head(hdr2, de_t, to_copy); | |
1829 | ||
1830 | /* remove all entries (sp including) from hdr1 */ | |
1831 | used = le32_to_cpu(hdr1->used) - to_copy - sp_size; | |
1832 | memmove(de_t, Add2Ptr(sp, sp_size), used - le32_to_cpu(hdr1->de_off)); | |
1833 | hdr1->used = cpu_to_le32(used); | |
1834 | ||
1835 | /* Insert new entry into left or right buffer (depending on sp <=> new_de) */ | |
1836 | hdr_insert_de(indx, | |
1837 | (*indx->cmp)(new_de + 1, le16_to_cpu(new_de->key_size), | |
1838 | up_e + 1, le16_to_cpu(up_e->key_size), | |
1839 | ctx) < 0 | |
1840 | ? hdr2 | |
1841 | : hdr1, | |
1842 | new_de, NULL, ctx); | |
1843 | ||
1844 | indx_mark_used(indx, ni, new_vbn >> indx->idx2vbn_bits); | |
1845 | ||
1846 | indx_write(indx, ni, n1, 0); | |
1847 | indx_write(indx, ni, n2, 0); | |
1848 | ||
1849 | put_indx_node(n2); | |
1850 | ||
1851 | /* | |
1852 | * we've finished splitting everybody, so we are ready to | |
1853 | * insert the promoted entry into the parent. | |
1854 | */ | |
1855 | if (!level) { | |
1856 | /* Insert in root */ | |
1857 | err = indx_insert_into_root(indx, ni, up_e, NULL, ctx, fnd); | |
1858 | if (err) | |
1859 | goto out; | |
1860 | } else { | |
1861 | /* | |
1862 | * The target buffer's parent is another index buffer | |
1863 | * TODO: Remove recursion | |
1864 | */ | |
1865 | err = indx_insert_into_buffer(indx, ni, root, up_e, ctx, | |
1866 | level - 1, fnd); | |
1867 | if (err) | |
1868 | goto out; | |
1869 | } | |
1870 | ||
1871 | out: | |
1872 | ntfs_free(up_e); | |
1873 | ||
1874 | return err; | |
1875 | } | |
1876 | ||
1877 | /* | |
1878 | * indx_insert_entry | |
1879 | * | |
1880 | * inserts new entry into index | |
1881 | */ | |
1882 | int indx_insert_entry(struct ntfs_index *indx, struct ntfs_inode *ni, | |
1883 | const struct NTFS_DE *new_de, const void *ctx, | |
1884 | struct ntfs_fnd *fnd) | |
1885 | { | |
1886 | int err; | |
1887 | int diff; | |
1888 | struct NTFS_DE *e; | |
1889 | struct ntfs_fnd *fnd_a = NULL; | |
1890 | struct INDEX_ROOT *root; | |
1891 | ||
1892 | if (!fnd) { | |
1893 | fnd_a = fnd_get(); | |
1894 | if (!fnd_a) { | |
1895 | err = -ENOMEM; | |
1896 | goto out1; | |
1897 | } | |
1898 | fnd = fnd_a; | |
1899 | } | |
1900 | ||
1901 | root = indx_get_root(indx, ni, NULL, NULL); | |
1902 | if (!root) { | |
1903 | err = -EINVAL; | |
1904 | goto out; | |
1905 | } | |
1906 | ||
1907 | if (fnd_is_empty(fnd)) { | |
1908 | /* Find the spot the tree where we want to insert the new entry. */ | |
1909 | err = indx_find(indx, ni, root, new_de + 1, | |
1910 | le16_to_cpu(new_de->key_size), ctx, &diff, &e, | |
1911 | fnd); | |
1912 | if (err) | |
1913 | goto out; | |
1914 | ||
1915 | if (!diff) { | |
1916 | err = -EEXIST; | |
1917 | goto out; | |
1918 | } | |
1919 | } | |
1920 | ||
1921 | if (!fnd->level) { | |
1922 | /* The root is also a leaf, so we'll insert the new entry into it. */ | |
1923 | err = indx_insert_into_root(indx, ni, new_de, fnd->root_de, ctx, | |
1924 | fnd); | |
1925 | if (err) | |
1926 | goto out; | |
1927 | } else { | |
1928 | /* found a leaf buffer, so we'll insert the new entry into it.*/ | |
1929 | err = indx_insert_into_buffer(indx, ni, root, new_de, ctx, | |
1930 | fnd->level - 1, fnd); | |
1931 | if (err) | |
1932 | goto out; | |
1933 | } | |
1934 | ||
1935 | out: | |
1936 | fnd_put(fnd_a); | |
1937 | out1: | |
1938 | return err; | |
1939 | } | |
1940 | ||
1941 | /* | |
1942 | * indx_find_buffer | |
1943 | * | |
1944 | * locates a buffer the tree. | |
1945 | */ | |
1946 | static struct indx_node *indx_find_buffer(struct ntfs_index *indx, | |
1947 | struct ntfs_inode *ni, | |
1948 | const struct INDEX_ROOT *root, | |
1949 | __le64 vbn, struct indx_node *n) | |
1950 | { | |
1951 | int err; | |
1952 | const struct NTFS_DE *e; | |
1953 | struct indx_node *r; | |
1954 | const struct INDEX_HDR *hdr = n ? &n->index->ihdr : &root->ihdr; | |
1955 | ||
1956 | /* Step 1: Scan one level */ | |
1957 | for (e = hdr_first_de(hdr);; e = hdr_next_de(hdr, e)) { | |
1958 | if (!e) | |
1959 | return ERR_PTR(-EINVAL); | |
1960 | ||
1961 | if (de_has_vcn(e) && vbn == de_get_vbn_le(e)) | |
1962 | return n; | |
1963 | ||
1964 | if (de_is_last(e)) | |
1965 | break; | |
1966 | } | |
1967 | ||
1968 | /* Step2: Do recursion */ | |
1969 | e = Add2Ptr(hdr, le32_to_cpu(hdr->de_off)); | |
1970 | for (;;) { | |
1971 | if (de_has_vcn_ex(e)) { | |
1972 | err = indx_read(indx, ni, de_get_vbn(e), &n); | |
1973 | if (err) | |
1974 | return ERR_PTR(err); | |
1975 | ||
1976 | r = indx_find_buffer(indx, ni, root, vbn, n); | |
1977 | if (r) | |
1978 | return r; | |
1979 | } | |
1980 | ||
1981 | if (de_is_last(e)) | |
1982 | break; | |
1983 | ||
1984 | e = Add2Ptr(e, le16_to_cpu(e->size)); | |
1985 | } | |
1986 | ||
1987 | return NULL; | |
1988 | } | |
1989 | ||
1990 | /* | |
1991 | * indx_shrink | |
1992 | * | |
1993 | * deallocates unused tail indexes | |
1994 | */ | |
1995 | static int indx_shrink(struct ntfs_index *indx, struct ntfs_inode *ni, | |
1996 | size_t bit) | |
1997 | { | |
1998 | int err = 0; | |
1999 | u64 bpb, new_data; | |
2000 | size_t nbits; | |
2001 | struct ATTRIB *b; | |
2002 | struct ATTR_LIST_ENTRY *le = NULL; | |
2003 | const struct INDEX_NAMES *in = &s_index_names[indx->type]; | |
2004 | ||
2005 | b = ni_find_attr(ni, NULL, &le, ATTR_BITMAP, in->name, in->name_len, | |
2006 | NULL, NULL); | |
2007 | ||
2008 | if (!b) | |
2009 | return -ENOENT; | |
2010 | ||
2011 | if (!b->non_res) { | |
2012 | unsigned long pos; | |
2013 | const unsigned long *bm = resident_data(b); | |
2014 | ||
2015 | nbits = le32_to_cpu(b->res.data_size) * 8; | |
2016 | ||
2017 | if (bit >= nbits) | |
2018 | return 0; | |
2019 | ||
2020 | pos = find_next_bit(bm, nbits, bit); | |
2021 | if (pos < nbits) | |
2022 | return 0; | |
2023 | } else { | |
2024 | size_t used = MINUS_ONE_T; | |
2025 | ||
2026 | nbits = le64_to_cpu(b->nres.data_size) * 8; | |
2027 | ||
2028 | if (bit >= nbits) | |
2029 | return 0; | |
2030 | ||
2031 | err = scan_nres_bitmap(ni, b, indx, bit, &scan_for_used, &used); | |
2032 | if (err) | |
2033 | return err; | |
2034 | ||
2035 | if (used != MINUS_ONE_T) | |
2036 | return 0; | |
2037 | } | |
2038 | ||
2039 | new_data = (u64)bit << indx->index_bits; | |
2040 | ||
2041 | err = attr_set_size(ni, ATTR_ALLOC, in->name, in->name_len, | |
2042 | &indx->alloc_run, new_data, &new_data, false, NULL); | |
2043 | if (err) | |
2044 | return err; | |
2045 | ||
2046 | bpb = bitmap_size(bit); | |
2047 | if (bpb * 8 == nbits) | |
2048 | return 0; | |
2049 | ||
2050 | err = attr_set_size(ni, ATTR_BITMAP, in->name, in->name_len, | |
2051 | &indx->bitmap_run, bpb, &bpb, false, NULL); | |
2052 | ||
2053 | return err; | |
2054 | } | |
2055 | ||
2056 | static int indx_free_children(struct ntfs_index *indx, struct ntfs_inode *ni, | |
2057 | const struct NTFS_DE *e, bool trim) | |
2058 | { | |
2059 | int err; | |
2060 | struct indx_node *n; | |
2061 | struct INDEX_HDR *hdr; | |
2062 | CLST vbn = de_get_vbn(e); | |
2063 | size_t i; | |
2064 | ||
2065 | err = indx_read(indx, ni, vbn, &n); | |
2066 | if (err) | |
2067 | return err; | |
2068 | ||
2069 | hdr = &n->index->ihdr; | |
2070 | /* First, recurse into the children, if any.*/ | |
2071 | if (hdr_has_subnode(hdr)) { | |
2072 | for (e = hdr_first_de(hdr); e; e = hdr_next_de(hdr, e)) { | |
2073 | indx_free_children(indx, ni, e, false); | |
2074 | if (de_is_last(e)) | |
2075 | break; | |
2076 | } | |
2077 | } | |
2078 | ||
2079 | put_indx_node(n); | |
2080 | ||
2081 | i = vbn >> indx->idx2vbn_bits; | |
2082 | /* We've gotten rid of the children; add this buffer to the free list. */ | |
2083 | indx_mark_free(indx, ni, i); | |
2084 | ||
2085 | if (!trim) | |
2086 | return 0; | |
2087 | ||
2088 | /* | |
2089 | * If there are no used indexes after current free index | |
2090 | * then we can truncate allocation and bitmap | |
2091 | * Use bitmap to estimate the case | |
2092 | */ | |
2093 | indx_shrink(indx, ni, i + 1); | |
2094 | return 0; | |
2095 | } | |
2096 | ||
2097 | /* | |
2098 | * indx_get_entry_to_replace | |
2099 | * | |
2100 | * finds a replacement entry for a deleted entry | |
2101 | * always returns a node entry: | |
2102 | * NTFS_IE_HAS_SUBNODES is set the flags and the size includes the sub_vcn | |
2103 | */ | |
2104 | static int indx_get_entry_to_replace(struct ntfs_index *indx, | |
2105 | struct ntfs_inode *ni, | |
2106 | const struct NTFS_DE *de_next, | |
2107 | struct NTFS_DE **de_to_replace, | |
2108 | struct ntfs_fnd *fnd) | |
2109 | { | |
2110 | int err; | |
2111 | int level = -1; | |
2112 | CLST vbn; | |
2113 | struct NTFS_DE *e, *te, *re; | |
2114 | struct indx_node *n; | |
2115 | struct INDEX_BUFFER *ib; | |
2116 | ||
2117 | *de_to_replace = NULL; | |
2118 | ||
2119 | /* Find first leaf entry down from de_next */ | |
2120 | vbn = de_get_vbn(de_next); | |
2121 | for (;;) { | |
2122 | n = NULL; | |
2123 | err = indx_read(indx, ni, vbn, &n); | |
2124 | if (err) | |
2125 | goto out; | |
2126 | ||
2127 | e = hdr_first_de(&n->index->ihdr); | |
2128 | fnd_push(fnd, n, e); | |
2129 | ||
2130 | if (!de_is_last(e)) { | |
2131 | /* | |
2132 | * This buffer is non-empty, so its first entry could be used as the | |
2133 | * replacement entry. | |
2134 | */ | |
2135 | level = fnd->level - 1; | |
2136 | } | |
2137 | ||
2138 | if (!de_has_vcn(e)) | |
2139 | break; | |
2140 | ||
2141 | /* This buffer is a node. Continue to go down */ | |
2142 | vbn = de_get_vbn(e); | |
2143 | } | |
2144 | ||
2145 | if (level == -1) | |
2146 | goto out; | |
2147 | ||
2148 | n = fnd->nodes[level]; | |
2149 | te = hdr_first_de(&n->index->ihdr); | |
2150 | /* Copy the candidate entry into the replacement entry buffer. */ | |
2151 | re = ntfs_malloc(le16_to_cpu(te->size) + sizeof(u64)); | |
2152 | if (!re) { | |
2153 | err = -ENOMEM; | |
2154 | goto out; | |
2155 | } | |
2156 | ||
2157 | *de_to_replace = re; | |
2158 | memcpy(re, te, le16_to_cpu(te->size)); | |
2159 | ||
2160 | if (!de_has_vcn(re)) { | |
2161 | /* | |
2162 | * The replacement entry we found doesn't have a sub_vcn. increase its size | |
2163 | * to hold one. | |
2164 | */ | |
2165 | le16_add_cpu(&re->size, sizeof(u64)); | |
2166 | re->flags |= NTFS_IE_HAS_SUBNODES; | |
2167 | } else { | |
2168 | /* | |
2169 | * The replacement entry we found was a node entry, which means that all | |
2170 | * its child buffers are empty. Return them to the free pool. | |
2171 | */ | |
2172 | indx_free_children(indx, ni, te, true); | |
2173 | } | |
2174 | ||
2175 | /* | |
2176 | * Expunge the replacement entry from its former location, | |
2177 | * and then write that buffer. | |
2178 | */ | |
2179 | ib = n->index; | |
2180 | e = hdr_delete_de(&ib->ihdr, te); | |
2181 | ||
2182 | fnd->de[level] = e; | |
2183 | indx_write(indx, ni, n, 0); | |
2184 | ||
2185 | /* Check to see if this action created an empty leaf. */ | |
2186 | if (ib_is_leaf(ib) && ib_is_empty(ib)) | |
2187 | return 0; | |
2188 | ||
2189 | out: | |
2190 | fnd_clear(fnd); | |
2191 | return err; | |
2192 | } | |
2193 | ||
2194 | /* | |
2195 | * indx_delete_entry | |
2196 | * | |
2197 | * deletes an entry from the index. | |
2198 | */ | |
2199 | int indx_delete_entry(struct ntfs_index *indx, struct ntfs_inode *ni, | |
2200 | const void *key, u32 key_len, const void *ctx) | |
2201 | { | |
2202 | int err, diff; | |
2203 | struct INDEX_ROOT *root; | |
2204 | struct INDEX_HDR *hdr; | |
2205 | struct ntfs_fnd *fnd, *fnd2; | |
2206 | struct INDEX_BUFFER *ib; | |
2207 | struct NTFS_DE *e, *re, *next, *prev, *me; | |
2208 | struct indx_node *n, *n2d = NULL; | |
2209 | __le64 sub_vbn; | |
2210 | int level, level2; | |
2211 | struct ATTRIB *attr; | |
2212 | struct mft_inode *mi; | |
2213 | u32 e_size, root_size, new_root_size; | |
2214 | size_t trim_bit; | |
2215 | const struct INDEX_NAMES *in; | |
2216 | ||
2217 | fnd = fnd_get(); | |
2218 | if (!fnd) { | |
2219 | err = -ENOMEM; | |
2220 | goto out2; | |
2221 | } | |
2222 | ||
2223 | fnd2 = fnd_get(); | |
2224 | if (!fnd2) { | |
2225 | err = -ENOMEM; | |
2226 | goto out1; | |
2227 | } | |
2228 | ||
2229 | root = indx_get_root(indx, ni, &attr, &mi); | |
2230 | if (!root) { | |
2231 | err = -EINVAL; | |
2232 | goto out; | |
2233 | } | |
2234 | ||
2235 | /* Locate the entry to remove. */ | |
2236 | err = indx_find(indx, ni, root, key, key_len, ctx, &diff, &e, fnd); | |
2237 | if (err) | |
2238 | goto out; | |
2239 | ||
2240 | if (!e || diff) { | |
2241 | err = -ENOENT; | |
2242 | goto out; | |
2243 | } | |
2244 | ||
2245 | level = fnd->level; | |
2246 | ||
2247 | if (level) { | |
2248 | n = fnd->nodes[level - 1]; | |
2249 | e = fnd->de[level - 1]; | |
2250 | ib = n->index; | |
2251 | hdr = &ib->ihdr; | |
2252 | } else { | |
2253 | hdr = &root->ihdr; | |
2254 | e = fnd->root_de; | |
2255 | n = NULL; | |
2256 | } | |
2257 | ||
2258 | e_size = le16_to_cpu(e->size); | |
2259 | ||
2260 | if (!de_has_vcn_ex(e)) { | |
2261 | /* The entry to delete is a leaf, so we can just rip it out */ | |
2262 | hdr_delete_de(hdr, e); | |
2263 | ||
2264 | if (!level) { | |
2265 | hdr->total = hdr->used; | |
2266 | ||
2267 | /* Shrink resident root attribute */ | |
2268 | mi_resize_attr(mi, attr, 0 - e_size); | |
2269 | goto out; | |
2270 | } | |
2271 | ||
2272 | indx_write(indx, ni, n, 0); | |
2273 | ||
2274 | /* | |
2275 | * Check to see if removing that entry made | |
2276 | * the leaf empty. | |
2277 | */ | |
2278 | if (ib_is_leaf(ib) && ib_is_empty(ib)) { | |
2279 | fnd_pop(fnd); | |
2280 | fnd_push(fnd2, n, e); | |
2281 | } | |
2282 | } else { | |
2283 | /* | |
2284 | * The entry we wish to delete is a node buffer, so we | |
2285 | * have to find a replacement for it. | |
2286 | */ | |
2287 | next = de_get_next(e); | |
2288 | ||
2289 | err = indx_get_entry_to_replace(indx, ni, next, &re, fnd2); | |
2290 | if (err) | |
2291 | goto out; | |
2292 | ||
2293 | if (re) { | |
2294 | de_set_vbn_le(re, de_get_vbn_le(e)); | |
2295 | hdr_delete_de(hdr, e); | |
2296 | ||
2297 | err = level ? indx_insert_into_buffer(indx, ni, root, | |
2298 | re, ctx, | |
2299 | fnd->level - 1, | |
2300 | fnd) | |
2301 | : indx_insert_into_root(indx, ni, re, e, | |
2302 | ctx, fnd); | |
2303 | ntfs_free(re); | |
2304 | ||
2305 | if (err) | |
2306 | goto out; | |
2307 | } else { | |
2308 | /* | |
2309 | * There is no replacement for the current entry. | |
2310 | * This means that the subtree rooted at its node is empty, | |
2311 | * and can be deleted, which turn means that the node can | |
2312 | * just inherit the deleted entry sub_vcn | |
2313 | */ | |
2314 | indx_free_children(indx, ni, next, true); | |
2315 | ||
2316 | de_set_vbn_le(next, de_get_vbn_le(e)); | |
2317 | hdr_delete_de(hdr, e); | |
2318 | if (level) { | |
2319 | indx_write(indx, ni, n, 0); | |
2320 | } else { | |
2321 | hdr->total = hdr->used; | |
2322 | ||
2323 | /* Shrink resident root attribute */ | |
2324 | mi_resize_attr(mi, attr, 0 - e_size); | |
2325 | } | |
2326 | } | |
2327 | } | |
2328 | ||
2329 | /* Delete a branch of tree */ | |
2330 | if (!fnd2 || !fnd2->level) | |
2331 | goto out; | |
2332 | ||
2333 | /* Reinit root 'cause it can be changed */ | |
2334 | root = indx_get_root(indx, ni, &attr, &mi); | |
2335 | if (!root) { | |
2336 | err = -EINVAL; | |
2337 | goto out; | |
2338 | } | |
2339 | ||
2340 | n2d = NULL; | |
2341 | sub_vbn = fnd2->nodes[0]->index->vbn; | |
2342 | level2 = 0; | |
2343 | level = fnd->level; | |
2344 | ||
2345 | hdr = level ? &fnd->nodes[level - 1]->index->ihdr : &root->ihdr; | |
2346 | ||
2347 | /* Scan current level */ | |
2348 | for (e = hdr_first_de(hdr);; e = hdr_next_de(hdr, e)) { | |
2349 | if (!e) { | |
2350 | err = -EINVAL; | |
2351 | goto out; | |
2352 | } | |
2353 | ||
2354 | if (de_has_vcn(e) && sub_vbn == de_get_vbn_le(e)) | |
2355 | break; | |
2356 | ||
2357 | if (de_is_last(e)) { | |
2358 | e = NULL; | |
2359 | break; | |
2360 | } | |
2361 | } | |
2362 | ||
2363 | if (!e) { | |
2364 | /* Do slow search from root */ | |
2365 | struct indx_node *in; | |
2366 | ||
2367 | fnd_clear(fnd); | |
2368 | ||
2369 | in = indx_find_buffer(indx, ni, root, sub_vbn, NULL); | |
2370 | if (IS_ERR(in)) { | |
2371 | err = PTR_ERR(in); | |
2372 | goto out; | |
2373 | } | |
2374 | ||
2375 | if (in) | |
2376 | fnd_push(fnd, in, NULL); | |
2377 | } | |
2378 | ||
2379 | /* Merge fnd2 -> fnd */ | |
2380 | for (level = 0; level < fnd2->level; level++) { | |
2381 | fnd_push(fnd, fnd2->nodes[level], fnd2->de[level]); | |
2382 | fnd2->nodes[level] = NULL; | |
2383 | } | |
2384 | fnd2->level = 0; | |
2385 | ||
2386 | hdr = NULL; | |
2387 | for (level = fnd->level; level; level--) { | |
2388 | struct indx_node *in = fnd->nodes[level - 1]; | |
2389 | ||
2390 | ib = in->index; | |
2391 | if (ib_is_empty(ib)) { | |
2392 | sub_vbn = ib->vbn; | |
2393 | } else { | |
2394 | hdr = &ib->ihdr; | |
2395 | n2d = in; | |
2396 | level2 = level; | |
2397 | break; | |
2398 | } | |
2399 | } | |
2400 | ||
2401 | if (!hdr) | |
2402 | hdr = &root->ihdr; | |
2403 | ||
2404 | e = hdr_first_de(hdr); | |
2405 | if (!e) { | |
2406 | err = -EINVAL; | |
2407 | goto out; | |
2408 | } | |
2409 | ||
2410 | if (hdr != &root->ihdr || !de_is_last(e)) { | |
2411 | prev = NULL; | |
2412 | while (!de_is_last(e)) { | |
2413 | if (de_has_vcn(e) && sub_vbn == de_get_vbn_le(e)) | |
2414 | break; | |
2415 | prev = e; | |
2416 | e = hdr_next_de(hdr, e); | |
2417 | if (!e) { | |
2418 | err = -EINVAL; | |
2419 | goto out; | |
2420 | } | |
2421 | } | |
2422 | ||
2423 | if (sub_vbn != de_get_vbn_le(e)) { | |
2424 | /* | |
2425 | * Didn't find the parent entry, although this buffer is the parent trail. | |
2426 | * Something is corrupt. | |
2427 | */ | |
2428 | err = -EINVAL; | |
2429 | goto out; | |
2430 | } | |
2431 | ||
2432 | if (de_is_last(e)) { | |
2433 | /* | |
2434 | * Since we can't remove the end entry, we'll remove its | |
2435 | * predecessor instead. This means we have to transfer the | |
2436 | * predecessor's sub_vcn to the end entry. | |
2437 | * Note: that this index block is not empty, so the | |
2438 | * predecessor must exist | |
2439 | */ | |
2440 | if (!prev) { | |
2441 | err = -EINVAL; | |
2442 | goto out; | |
2443 | } | |
2444 | ||
2445 | if (de_has_vcn(prev)) { | |
2446 | de_set_vbn_le(e, de_get_vbn_le(prev)); | |
2447 | } else if (de_has_vcn(e)) { | |
2448 | le16_sub_cpu(&e->size, sizeof(u64)); | |
2449 | e->flags &= ~NTFS_IE_HAS_SUBNODES; | |
2450 | le32_sub_cpu(&hdr->used, sizeof(u64)); | |
2451 | } | |
2452 | e = prev; | |
2453 | } | |
2454 | ||
2455 | /* | |
2456 | * Copy the current entry into a temporary buffer (stripping off its | |
2457 | * down-pointer, if any) and delete it from the current buffer or root, | |
2458 | * as appropriate. | |
2459 | */ | |
2460 | e_size = le16_to_cpu(e->size); | |
2461 | me = ntfs_memdup(e, e_size); | |
2462 | if (!me) { | |
2463 | err = -ENOMEM; | |
2464 | goto out; | |
2465 | } | |
2466 | ||
2467 | if (de_has_vcn(me)) { | |
2468 | me->flags &= ~NTFS_IE_HAS_SUBNODES; | |
2469 | le16_sub_cpu(&me->size, sizeof(u64)); | |
2470 | } | |
2471 | ||
2472 | hdr_delete_de(hdr, e); | |
2473 | ||
2474 | if (hdr == &root->ihdr) { | |
2475 | level = 0; | |
2476 | hdr->total = hdr->used; | |
2477 | ||
2478 | /* Shrink resident root attribute */ | |
2479 | mi_resize_attr(mi, attr, 0 - e_size); | |
2480 | } else { | |
2481 | indx_write(indx, ni, n2d, 0); | |
2482 | level = level2; | |
2483 | } | |
2484 | ||
2485 | /* Mark unused buffers as free */ | |
2486 | trim_bit = -1; | |
2487 | for (; level < fnd->level; level++) { | |
2488 | ib = fnd->nodes[level]->index; | |
2489 | if (ib_is_empty(ib)) { | |
2490 | size_t k = le64_to_cpu(ib->vbn) >> | |
2491 | indx->idx2vbn_bits; | |
2492 | ||
2493 | indx_mark_free(indx, ni, k); | |
2494 | if (k < trim_bit) | |
2495 | trim_bit = k; | |
2496 | } | |
2497 | } | |
2498 | ||
2499 | fnd_clear(fnd); | |
2500 | /*fnd->root_de = NULL;*/ | |
2501 | ||
2502 | /* | |
2503 | * Re-insert the entry into the tree. | |
2504 | * Find the spot the tree where we want to insert the new entry. | |
2505 | */ | |
2506 | err = indx_insert_entry(indx, ni, me, ctx, fnd); | |
2507 | ntfs_free(me); | |
2508 | if (err) | |
2509 | goto out; | |
2510 | ||
2511 | if (trim_bit != -1) | |
2512 | indx_shrink(indx, ni, trim_bit); | |
2513 | } else { | |
2514 | /* | |
2515 | * This tree needs to be collapsed down to an empty root. | |
2516 | * Recreate the index root as an empty leaf and free all the bits the | |
2517 | * index allocation bitmap. | |
2518 | */ | |
2519 | fnd_clear(fnd); | |
2520 | fnd_clear(fnd2); | |
2521 | ||
2522 | in = &s_index_names[indx->type]; | |
2523 | ||
2524 | err = attr_set_size(ni, ATTR_ALLOC, in->name, in->name_len, | |
2525 | &indx->alloc_run, 0, NULL, false, NULL); | |
2526 | err = ni_remove_attr(ni, ATTR_ALLOC, in->name, in->name_len, | |
2527 | false, NULL); | |
2528 | run_close(&indx->alloc_run); | |
2529 | ||
2530 | err = attr_set_size(ni, ATTR_BITMAP, in->name, in->name_len, | |
2531 | &indx->bitmap_run, 0, NULL, false, NULL); | |
2532 | err = ni_remove_attr(ni, ATTR_BITMAP, in->name, in->name_len, | |
2533 | false, NULL); | |
2534 | run_close(&indx->bitmap_run); | |
2535 | ||
2536 | root = indx_get_root(indx, ni, &attr, &mi); | |
2537 | if (!root) { | |
2538 | err = -EINVAL; | |
2539 | goto out; | |
2540 | } | |
2541 | ||
2542 | root_size = le32_to_cpu(attr->res.data_size); | |
2543 | new_root_size = | |
2544 | sizeof(struct INDEX_ROOT) + sizeof(struct NTFS_DE); | |
2545 | ||
2546 | if (new_root_size != root_size && | |
2547 | !mi_resize_attr(mi, attr, new_root_size - root_size)) { | |
2548 | err = -EINVAL; | |
2549 | goto out; | |
2550 | } | |
2551 | ||
2552 | /* Fill first entry */ | |
2553 | e = (struct NTFS_DE *)(root + 1); | |
2554 | e->ref.low = 0; | |
2555 | e->ref.high = 0; | |
2556 | e->ref.seq = 0; | |
2557 | e->size = cpu_to_le16(sizeof(struct NTFS_DE)); | |
2558 | e->flags = NTFS_IE_LAST; // 0x02 | |
2559 | e->key_size = 0; | |
2560 | e->res = 0; | |
2561 | ||
2562 | hdr = &root->ihdr; | |
2563 | hdr->flags = 0; | |
2564 | hdr->used = hdr->total = cpu_to_le32( | |
2565 | new_root_size - offsetof(struct INDEX_ROOT, ihdr)); | |
2566 | mi->dirty = true; | |
2567 | } | |
2568 | ||
2569 | out: | |
2570 | fnd_put(fnd2); | |
2571 | out1: | |
2572 | fnd_put(fnd); | |
2573 | out2: | |
2574 | return err; | |
2575 | } | |
2576 | ||
2577 | /* | |
2578 | * Update duplicated information in directory entry | |
2579 | * 'dup' - info from MFT record | |
2580 | */ | |
2581 | int indx_update_dup(struct ntfs_inode *ni, struct ntfs_sb_info *sbi, | |
2582 | const struct ATTR_FILE_NAME *fname, | |
2583 | const struct NTFS_DUP_INFO *dup, int sync) | |
2584 | { | |
2585 | int err, diff; | |
2586 | struct NTFS_DE *e = NULL; | |
2587 | struct ATTR_FILE_NAME *e_fname; | |
2588 | struct ntfs_fnd *fnd; | |
2589 | struct INDEX_ROOT *root; | |
2590 | struct mft_inode *mi; | |
2591 | struct ntfs_index *indx = &ni->dir; | |
2592 | ||
2593 | fnd = fnd_get(); | |
2594 | if (!fnd) { | |
2595 | err = -ENOMEM; | |
2596 | goto out1; | |
2597 | } | |
2598 | ||
2599 | root = indx_get_root(indx, ni, NULL, &mi); | |
2600 | if (!root) { | |
2601 | err = -EINVAL; | |
2602 | goto out; | |
2603 | } | |
2604 | ||
2605 | /* Find entry in directory */ | |
2606 | err = indx_find(indx, ni, root, fname, fname_full_size(fname), sbi, | |
2607 | &diff, &e, fnd); | |
2608 | if (err) | |
2609 | goto out; | |
2610 | ||
2611 | if (!e) { | |
2612 | err = -EINVAL; | |
2613 | goto out; | |
2614 | } | |
2615 | ||
2616 | if (diff) { | |
2617 | err = -EINVAL; | |
2618 | goto out; | |
2619 | } | |
2620 | ||
2621 | e_fname = (struct ATTR_FILE_NAME *)(e + 1); | |
2622 | ||
2623 | if (!memcmp(&e_fname->dup, dup, sizeof(*dup))) { | |
2624 | /* nothing to update in index! Try to avoid this call */ | |
2625 | goto out; | |
2626 | } | |
2627 | ||
2628 | memcpy(&e_fname->dup, dup, sizeof(*dup)); | |
2629 | ||
2630 | if (fnd->level) { | |
2631 | /* directory entry in index */ | |
2632 | err = indx_write(indx, ni, fnd->nodes[fnd->level - 1], sync); | |
2633 | } else { | |
2634 | /* directory entry in directory MFT record */ | |
2635 | mi->dirty = true; | |
2636 | if (sync) | |
2637 | err = mi_write(mi, 1); | |
2638 | else | |
2639 | mark_inode_dirty(&ni->vfs_inode); | |
2640 | } | |
2641 | ||
2642 | out: | |
2643 | fnd_put(fnd); | |
2644 | ||
2645 | out1: | |
2646 | return err; | |
2647 | } |