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33#include <linux/crc32.h>
34#include <linux/slab.h>
35#include "ubifs.h"
36
37
38
39
40
41
42
43
44
45
46
47enum {
48 NAME_LESS = 0,
49 NAME_MATCHES = 1,
50 NAME_GREATER = 2,
51 NOT_ON_MEDIA = 3,
52};
53
54
55
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76
77static int insert_old_idx(struct ubifs_info *c, int lnum, int offs)
78{
79 struct ubifs_old_idx *old_idx, *o;
80 struct rb_node **p, *parent = NULL;
81
82 old_idx = kmalloc(sizeof(struct ubifs_old_idx), GFP_NOFS);
83 if (unlikely(!old_idx))
84 return -ENOMEM;
85 old_idx->lnum = lnum;
86 old_idx->offs = offs;
87
88 p = &c->old_idx.rb_node;
89 while (*p) {
90 parent = *p;
91 o = rb_entry(parent, struct ubifs_old_idx, rb);
92 if (lnum < o->lnum)
93 p = &(*p)->rb_left;
94 else if (lnum > o->lnum)
95 p = &(*p)->rb_right;
96 else if (offs < o->offs)
97 p = &(*p)->rb_left;
98 else if (offs > o->offs)
99 p = &(*p)->rb_right;
100 else {
101 ubifs_err(c, "old idx added twice!");
102 kfree(old_idx);
103 return 0;
104 }
105 }
106 rb_link_node(&old_idx->rb, parent, p);
107 rb_insert_color(&old_idx->rb, &c->old_idx);
108 return 0;
109}
110
111
112
113
114
115
116
117
118int insert_old_idx_znode(struct ubifs_info *c, struct ubifs_znode *znode)
119{
120 if (znode->parent) {
121 struct ubifs_zbranch *zbr;
122
123 zbr = &znode->parent->zbranch[znode->iip];
124 if (zbr->len)
125 return insert_old_idx(c, zbr->lnum, zbr->offs);
126 } else
127 if (c->zroot.len)
128 return insert_old_idx(c, c->zroot.lnum,
129 c->zroot.offs);
130 return 0;
131}
132
133
134
135
136
137
138
139
140static int ins_clr_old_idx_znode(struct ubifs_info *c,
141 struct ubifs_znode *znode)
142{
143 int err;
144
145 if (znode->parent) {
146 struct ubifs_zbranch *zbr;
147
148 zbr = &znode->parent->zbranch[znode->iip];
149 if (zbr->len) {
150 err = insert_old_idx(c, zbr->lnum, zbr->offs);
151 if (err)
152 return err;
153 zbr->lnum = 0;
154 zbr->offs = 0;
155 zbr->len = 0;
156 }
157 } else
158 if (c->zroot.len) {
159 err = insert_old_idx(c, c->zroot.lnum, c->zroot.offs);
160 if (err)
161 return err;
162 c->zroot.lnum = 0;
163 c->zroot.offs = 0;
164 c->zroot.len = 0;
165 }
166 return 0;
167}
168
169
170
171
172
173
174
175
176
177
178
179void destroy_old_idx(struct ubifs_info *c)
180{
181 struct ubifs_old_idx *old_idx, *n;
182
183 rbtree_postorder_for_each_entry_safe(old_idx, n, &c->old_idx, rb)
184 kfree(old_idx);
185
186 c->old_idx = RB_ROOT;
187}
188
189
190
191
192
193
194
195
196static struct ubifs_znode *copy_znode(struct ubifs_info *c,
197 struct ubifs_znode *znode)
198{
199 struct ubifs_znode *zn;
200
201 zn = kmemdup(znode, c->max_znode_sz, GFP_NOFS);
202 if (unlikely(!zn))
203 return ERR_PTR(-ENOMEM);
204
205 zn->cnext = NULL;
206 __set_bit(DIRTY_ZNODE, &zn->flags);
207 __clear_bit(COW_ZNODE, &zn->flags);
208
209 ubifs_assert(!ubifs_zn_obsolete(znode));
210 __set_bit(OBSOLETE_ZNODE, &znode->flags);
211
212 if (znode->level != 0) {
213 int i;
214 const int n = zn->child_cnt;
215
216
217 for (i = 0; i < n; i++) {
218 struct ubifs_zbranch *zbr = &zn->zbranch[i];
219
220 if (zbr->znode)
221 zbr->znode->parent = zn;
222 }
223 }
224
225 atomic_long_inc(&c->dirty_zn_cnt);
226 return zn;
227}
228
229
230
231
232
233
234
235
236
237static int add_idx_dirt(struct ubifs_info *c, int lnum, int dirt)
238{
239 c->calc_idx_sz -= ALIGN(dirt, 8);
240 return ubifs_add_dirt(c, lnum, dirt);
241}
242
243
244
245
246
247
248
249
250static struct ubifs_znode *dirty_cow_znode(struct ubifs_info *c,
251 struct ubifs_zbranch *zbr)
252{
253 struct ubifs_znode *znode = zbr->znode;
254 struct ubifs_znode *zn;
255 int err;
256
257 if (!ubifs_zn_cow(znode)) {
258
259 if (!test_and_set_bit(DIRTY_ZNODE, &znode->flags)) {
260 atomic_long_inc(&c->dirty_zn_cnt);
261 atomic_long_dec(&c->clean_zn_cnt);
262 atomic_long_dec(&ubifs_clean_zn_cnt);
263 err = add_idx_dirt(c, zbr->lnum, zbr->len);
264 if (unlikely(err))
265 return ERR_PTR(err);
266 }
267 return znode;
268 }
269
270 zn = copy_znode(c, znode);
271 if (IS_ERR(zn))
272 return zn;
273
274 if (zbr->len) {
275 err = insert_old_idx(c, zbr->lnum, zbr->offs);
276 if (unlikely(err))
277 return ERR_PTR(err);
278 err = add_idx_dirt(c, zbr->lnum, zbr->len);
279 } else
280 err = 0;
281
282 zbr->znode = zn;
283 zbr->lnum = 0;
284 zbr->offs = 0;
285 zbr->len = 0;
286
287 if (unlikely(err))
288 return ERR_PTR(err);
289 return zn;
290}
291
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311
312static int lnc_add(struct ubifs_info *c, struct ubifs_zbranch *zbr,
313 const void *node)
314{
315 int err;
316 void *lnc_node;
317 const struct ubifs_dent_node *dent = node;
318
319 ubifs_assert(!zbr->leaf);
320 ubifs_assert(zbr->len != 0);
321 ubifs_assert(is_hash_key(c, &zbr->key));
322
323 err = ubifs_validate_entry(c, dent);
324 if (err) {
325 dump_stack();
326 ubifs_dump_node(c, dent);
327 return err;
328 }
329
330 lnc_node = kmemdup(node, zbr->len, GFP_NOFS);
331 if (!lnc_node)
332
333 return 0;
334
335 zbr->leaf = lnc_node;
336 return 0;
337}
338
339
340
341
342
343
344
345
346
347
348static int lnc_add_directly(struct ubifs_info *c, struct ubifs_zbranch *zbr,
349 void *node)
350{
351 int err;
352
353 ubifs_assert(!zbr->leaf);
354 ubifs_assert(zbr->len != 0);
355
356 err = ubifs_validate_entry(c, node);
357 if (err) {
358 dump_stack();
359 ubifs_dump_node(c, node);
360 return err;
361 }
362
363 zbr->leaf = node;
364 return 0;
365}
366
367
368
369
370
371
372static void lnc_free(struct ubifs_zbranch *zbr)
373{
374 if (!zbr->leaf)
375 return;
376 kfree(zbr->leaf);
377 zbr->leaf = NULL;
378}
379
380
381
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388
389
390
391static int tnc_read_node_nm(struct ubifs_info *c, struct ubifs_zbranch *zbr,
392 void *node)
393{
394 int err;
395
396 ubifs_assert(is_hash_key(c, &zbr->key));
397
398 if (zbr->leaf) {
399
400 ubifs_assert(zbr->len != 0);
401 memcpy(node, zbr->leaf, zbr->len);
402 return 0;
403 }
404
405 err = ubifs_tnc_read_node(c, zbr, node);
406 if (err)
407 return err;
408
409
410 err = lnc_add(c, zbr, node);
411 return err;
412}
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438static int try_read_node(const struct ubifs_info *c, void *buf, int type,
439 int len, int lnum, int offs)
440{
441 int err, node_len;
442 struct ubifs_ch *ch = buf;
443 uint32_t crc, node_crc;
444
445 dbg_io("LEB %d:%d, %s, length %d", lnum, offs, dbg_ntype(type), len);
446
447 err = ubifs_leb_read(c, lnum, buf, offs, len, 1);
448 if (err) {
449 ubifs_err(c, "cannot read node type %d from LEB %d:%d, error %d",
450 type, lnum, offs, err);
451 return err;
452 }
453
454 if (le32_to_cpu(ch->magic) != UBIFS_NODE_MAGIC)
455 return 0;
456
457 if (ch->node_type != type)
458 return 0;
459
460 node_len = le32_to_cpu(ch->len);
461 if (node_len != len)
462 return 0;
463
464 if (type == UBIFS_DATA_NODE && c->no_chk_data_crc && !c->mounting &&
465 !c->remounting_rw)
466 return 1;
467
468 crc = crc32(UBIFS_CRC32_INIT, buf + 8, node_len - 8);
469 node_crc = le32_to_cpu(ch->crc);
470 if (crc != node_crc)
471 return 0;
472
473 return 1;
474}
475
476
477
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481
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483
484
485
486static int fallible_read_node(struct ubifs_info *c, const union ubifs_key *key,
487 struct ubifs_zbranch *zbr, void *node)
488{
489 int ret;
490
491 dbg_tnck(key, "LEB %d:%d, key ", zbr->lnum, zbr->offs);
492
493 ret = try_read_node(c, node, key_type(c, key), zbr->len, zbr->lnum,
494 zbr->offs);
495 if (ret == 1) {
496 union ubifs_key node_key;
497 struct ubifs_dent_node *dent = node;
498
499
500 key_read(c, &dent->key, &node_key);
501 if (keys_cmp(c, key, &node_key) != 0)
502 ret = 0;
503 }
504 if (ret == 0 && c->replaying)
505 dbg_mntk(key, "dangling branch LEB %d:%d len %d, key ",
506 zbr->lnum, zbr->offs, zbr->len);
507 return ret;
508}
509
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519
520
521static int matches_name(struct ubifs_info *c, struct ubifs_zbranch *zbr,
522 const struct qstr *nm)
523{
524 struct ubifs_dent_node *dent;
525 int nlen, err;
526
527
528 if (!zbr->leaf) {
529 dent = kmalloc(zbr->len, GFP_NOFS);
530 if (!dent)
531 return -ENOMEM;
532
533 err = ubifs_tnc_read_node(c, zbr, dent);
534 if (err)
535 goto out_free;
536
537
538 err = lnc_add_directly(c, zbr, dent);
539 if (err)
540 goto out_free;
541 } else
542 dent = zbr->leaf;
543
544 nlen = le16_to_cpu(dent->nlen);
545 err = memcmp(dent->name, nm->name, min_t(int, nlen, nm->len));
546 if (err == 0) {
547 if (nlen == nm->len)
548 return NAME_MATCHES;
549 else if (nlen < nm->len)
550 return NAME_LESS;
551 else
552 return NAME_GREATER;
553 } else if (err < 0)
554 return NAME_LESS;
555 else
556 return NAME_GREATER;
557
558out_free:
559 kfree(dent);
560 return err;
561}
562
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569
570
571static struct ubifs_znode *get_znode(struct ubifs_info *c,
572 struct ubifs_znode *znode, int n)
573{
574 struct ubifs_zbranch *zbr;
575
576 zbr = &znode->zbranch[n];
577 if (zbr->znode)
578 znode = zbr->znode;
579 else
580 znode = ubifs_load_znode(c, zbr, znode, n);
581 return znode;
582}
583
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592
593static int tnc_next(struct ubifs_info *c, struct ubifs_znode **zn, int *n)
594{
595 struct ubifs_znode *znode = *zn;
596 int nn = *n;
597
598 nn += 1;
599 if (nn < znode->child_cnt) {
600 *n = nn;
601 return 0;
602 }
603 while (1) {
604 struct ubifs_znode *zp;
605
606 zp = znode->parent;
607 if (!zp)
608 return -ENOENT;
609 nn = znode->iip + 1;
610 znode = zp;
611 if (nn < znode->child_cnt) {
612 znode = get_znode(c, znode, nn);
613 if (IS_ERR(znode))
614 return PTR_ERR(znode);
615 while (znode->level != 0) {
616 znode = get_znode(c, znode, 0);
617 if (IS_ERR(znode))
618 return PTR_ERR(znode);
619 }
620 nn = 0;
621 break;
622 }
623 }
624 *zn = znode;
625 *n = nn;
626 return 0;
627}
628
629
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631
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636
637
638static int tnc_prev(struct ubifs_info *c, struct ubifs_znode **zn, int *n)
639{
640 struct ubifs_znode *znode = *zn;
641 int nn = *n;
642
643 if (nn > 0) {
644 *n = nn - 1;
645 return 0;
646 }
647 while (1) {
648 struct ubifs_znode *zp;
649
650 zp = znode->parent;
651 if (!zp)
652 return -ENOENT;
653 nn = znode->iip - 1;
654 znode = zp;
655 if (nn >= 0) {
656 znode = get_znode(c, znode, nn);
657 if (IS_ERR(znode))
658 return PTR_ERR(znode);
659 while (znode->level != 0) {
660 nn = znode->child_cnt - 1;
661 znode = get_znode(c, znode, nn);
662 if (IS_ERR(znode))
663 return PTR_ERR(znode);
664 }
665 nn = znode->child_cnt - 1;
666 break;
667 }
668 }
669 *zn = znode;
670 *n = nn;
671 return 0;
672}
673
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689
690static int resolve_collision(struct ubifs_info *c, const union ubifs_key *key,
691 struct ubifs_znode **zn, int *n,
692 const struct qstr *nm)
693{
694 int err;
695
696 err = matches_name(c, &(*zn)->zbranch[*n], nm);
697 if (unlikely(err < 0))
698 return err;
699 if (err == NAME_MATCHES)
700 return 1;
701
702 if (err == NAME_GREATER) {
703
704 while (1) {
705 err = tnc_prev(c, zn, n);
706 if (err == -ENOENT) {
707 ubifs_assert(*n == 0);
708 *n = -1;
709 return 0;
710 }
711 if (err < 0)
712 return err;
713 if (keys_cmp(c, &(*zn)->zbranch[*n].key, key)) {
714
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741
742
743 if (*n == (*zn)->child_cnt - 1) {
744 err = tnc_next(c, zn, n);
745 if (err) {
746
747 ubifs_assert(0);
748 if (err == -ENOENT)
749 err = -EINVAL;
750 return err;
751 }
752 ubifs_assert(*n == 0);
753 *n = -1;
754 }
755 return 0;
756 }
757 err = matches_name(c, &(*zn)->zbranch[*n], nm);
758 if (err < 0)
759 return err;
760 if (err == NAME_LESS)
761 return 0;
762 if (err == NAME_MATCHES)
763 return 1;
764 ubifs_assert(err == NAME_GREATER);
765 }
766 } else {
767 int nn = *n;
768 struct ubifs_znode *znode = *zn;
769
770
771 while (1) {
772 err = tnc_next(c, &znode, &nn);
773 if (err == -ENOENT)
774 return 0;
775 if (err < 0)
776 return err;
777 if (keys_cmp(c, &znode->zbranch[nn].key, key))
778 return 0;
779 err = matches_name(c, &znode->zbranch[nn], nm);
780 if (err < 0)
781 return err;
782 if (err == NAME_GREATER)
783 return 0;
784 *zn = znode;
785 *n = nn;
786 if (err == NAME_MATCHES)
787 return 1;
788 ubifs_assert(err == NAME_LESS);
789 }
790 }
791}
792
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807
808static int fallible_matches_name(struct ubifs_info *c,
809 struct ubifs_zbranch *zbr,
810 const struct qstr *nm)
811{
812 struct ubifs_dent_node *dent;
813 int nlen, err;
814
815
816 if (!zbr->leaf) {
817 dent = kmalloc(zbr->len, GFP_NOFS);
818 if (!dent)
819 return -ENOMEM;
820
821 err = fallible_read_node(c, &zbr->key, zbr, dent);
822 if (err < 0)
823 goto out_free;
824 if (err == 0) {
825
826 err = NOT_ON_MEDIA;
827 goto out_free;
828 }
829 ubifs_assert(err == 1);
830
831 err = lnc_add_directly(c, zbr, dent);
832 if (err)
833 goto out_free;
834 } else
835 dent = zbr->leaf;
836
837 nlen = le16_to_cpu(dent->nlen);
838 err = memcmp(dent->name, nm->name, min_t(int, nlen, nm->len));
839 if (err == 0) {
840 if (nlen == nm->len)
841 return NAME_MATCHES;
842 else if (nlen < nm->len)
843 return NAME_LESS;
844 else
845 return NAME_GREATER;
846 } else if (err < 0)
847 return NAME_LESS;
848 else
849 return NAME_GREATER;
850
851out_free:
852 kfree(dent);
853 return err;
854}
855
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878static int fallible_resolve_collision(struct ubifs_info *c,
879 const union ubifs_key *key,
880 struct ubifs_znode **zn, int *n,
881 const struct qstr *nm, int adding)
882{
883 struct ubifs_znode *o_znode = NULL, *znode = *zn;
884 int uninitialized_var(o_n), err, cmp, unsure = 0, nn = *n;
885
886 cmp = fallible_matches_name(c, &znode->zbranch[nn], nm);
887 if (unlikely(cmp < 0))
888 return cmp;
889 if (cmp == NAME_MATCHES)
890 return 1;
891 if (cmp == NOT_ON_MEDIA) {
892 o_znode = znode;
893 o_n = nn;
894
895
896
897
898
899 unsure = 1;
900 } else if (!adding)
901 unsure = 1;
902
903 if (cmp == NAME_GREATER || unsure) {
904
905 while (1) {
906 err = tnc_prev(c, zn, n);
907 if (err == -ENOENT) {
908 ubifs_assert(*n == 0);
909 *n = -1;
910 break;
911 }
912 if (err < 0)
913 return err;
914 if (keys_cmp(c, &(*zn)->zbranch[*n].key, key)) {
915
916 if (*n == (*zn)->child_cnt - 1) {
917 err = tnc_next(c, zn, n);
918 if (err) {
919
920 ubifs_assert(0);
921 if (err == -ENOENT)
922 err = -EINVAL;
923 return err;
924 }
925 ubifs_assert(*n == 0);
926 *n = -1;
927 }
928 break;
929 }
930 err = fallible_matches_name(c, &(*zn)->zbranch[*n], nm);
931 if (err < 0)
932 return err;
933 if (err == NAME_MATCHES)
934 return 1;
935 if (err == NOT_ON_MEDIA) {
936 o_znode = *zn;
937 o_n = *n;
938 continue;
939 }
940 if (!adding)
941 continue;
942 if (err == NAME_LESS)
943 break;
944 else
945 unsure = 0;
946 }
947 }
948
949 if (cmp == NAME_LESS || unsure) {
950
951 *zn = znode;
952 *n = nn;
953 while (1) {
954 err = tnc_next(c, &znode, &nn);
955 if (err == -ENOENT)
956 break;
957 if (err < 0)
958 return err;
959 if (keys_cmp(c, &znode->zbranch[nn].key, key))
960 break;
961 err = fallible_matches_name(c, &znode->zbranch[nn], nm);
962 if (err < 0)
963 return err;
964 if (err == NAME_GREATER)
965 break;
966 *zn = znode;
967 *n = nn;
968 if (err == NAME_MATCHES)
969 return 1;
970 if (err == NOT_ON_MEDIA) {
971 o_znode = znode;
972 o_n = nn;
973 }
974 }
975 }
976
977
978 if (adding || !o_znode)
979 return 0;
980
981 dbg_mntk(key, "dangling match LEB %d:%d len %d key ",
982 o_znode->zbranch[o_n].lnum, o_znode->zbranch[o_n].offs,
983 o_znode->zbranch[o_n].len);
984 *zn = o_znode;
985 *n = o_n;
986 return 1;
987}
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996
997static int matches_position(struct ubifs_zbranch *zbr, int lnum, int offs)
998{
999 if (zbr->lnum == lnum && zbr->offs == offs)
1000 return 1;
1001 else
1002 return 0;
1003}
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1022static int resolve_collision_directly(struct ubifs_info *c,
1023 const union ubifs_key *key,
1024 struct ubifs_znode **zn, int *n,
1025 int lnum, int offs)
1026{
1027 struct ubifs_znode *znode;
1028 int nn, err;
1029
1030 znode = *zn;
1031 nn = *n;
1032 if (matches_position(&znode->zbranch[nn], lnum, offs))
1033 return 1;
1034
1035
1036 while (1) {
1037 err = tnc_prev(c, &znode, &nn);
1038 if (err == -ENOENT)
1039 break;
1040 if (err < 0)
1041 return err;
1042 if (keys_cmp(c, &znode->zbranch[nn].key, key))
1043 break;
1044 if (matches_position(&znode->zbranch[nn], lnum, offs)) {
1045 *zn = znode;
1046 *n = nn;
1047 return 1;
1048 }
1049 }
1050
1051
1052 znode = *zn;
1053 nn = *n;
1054 while (1) {
1055 err = tnc_next(c, &znode, &nn);
1056 if (err == -ENOENT)
1057 return 0;
1058 if (err < 0)
1059 return err;
1060 if (keys_cmp(c, &znode->zbranch[nn].key, key))
1061 return 0;
1062 *zn = znode;
1063 *n = nn;
1064 if (matches_position(&znode->zbranch[nn], lnum, offs))
1065 return 1;
1066 }
1067}
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079static struct ubifs_znode *dirty_cow_bottom_up(struct ubifs_info *c,
1080 struct ubifs_znode *znode)
1081{
1082 struct ubifs_znode *zp;
1083 int *path = c->bottom_up_buf, p = 0;
1084
1085 ubifs_assert(c->zroot.znode);
1086 ubifs_assert(znode);
1087 if (c->zroot.znode->level > BOTTOM_UP_HEIGHT) {
1088 kfree(c->bottom_up_buf);
1089 c->bottom_up_buf = kmalloc(c->zroot.znode->level * sizeof(int),
1090 GFP_NOFS);
1091 if (!c->bottom_up_buf)
1092 return ERR_PTR(-ENOMEM);
1093 path = c->bottom_up_buf;
1094 }
1095 if (c->zroot.znode->level) {
1096
1097 while (1) {
1098 int n;
1099
1100 zp = znode->parent;
1101 if (!zp)
1102 break;
1103 n = znode->iip;
1104 ubifs_assert(p < c->zroot.znode->level);
1105 path[p++] = n;
1106 if (!zp->cnext && ubifs_zn_dirty(znode))
1107 break;
1108 znode = zp;
1109 }
1110 }
1111
1112
1113 while (1) {
1114 struct ubifs_zbranch *zbr;
1115
1116 zp = znode->parent;
1117 if (zp) {
1118 ubifs_assert(path[p - 1] >= 0);
1119 ubifs_assert(path[p - 1] < zp->child_cnt);
1120 zbr = &zp->zbranch[path[--p]];
1121 znode = dirty_cow_znode(c, zbr);
1122 } else {
1123 ubifs_assert(znode == c->zroot.znode);
1124 znode = dirty_cow_znode(c, &c->zroot);
1125 }
1126 if (IS_ERR(znode) || !p)
1127 break;
1128 ubifs_assert(path[p - 1] >= 0);
1129 ubifs_assert(path[p - 1] < znode->child_cnt);
1130 znode = znode->zbranch[path[p - 1]].znode;
1131 }
1132
1133 return znode;
1134}
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158int ubifs_lookup_level0(struct ubifs_info *c, const union ubifs_key *key,
1159 struct ubifs_znode **zn, int *n)
1160{
1161 int err, exact;
1162 struct ubifs_znode *znode;
1163 unsigned long time = get_seconds();
1164
1165 dbg_tnck(key, "search key ");
1166 ubifs_assert(key_type(c, key) < UBIFS_INVALID_KEY);
1167
1168 znode = c->zroot.znode;
1169 if (unlikely(!znode)) {
1170 znode = ubifs_load_znode(c, &c->zroot, NULL, 0);
1171 if (IS_ERR(znode))
1172 return PTR_ERR(znode);
1173 }
1174
1175 znode->time = time;
1176
1177 while (1) {
1178 struct ubifs_zbranch *zbr;
1179
1180 exact = ubifs_search_zbranch(c, znode, key, n);
1181
1182 if (znode->level == 0)
1183 break;
1184
1185 if (*n < 0)
1186 *n = 0;
1187 zbr = &znode->zbranch[*n];
1188
1189 if (zbr->znode) {
1190 znode->time = time;
1191 znode = zbr->znode;
1192 continue;
1193 }
1194
1195
1196 znode = ubifs_load_znode(c, zbr, znode, *n);
1197 if (IS_ERR(znode))
1198 return PTR_ERR(znode);
1199 }
1200
1201 *zn = znode;
1202 if (exact || !is_hash_key(c, key) || *n != -1) {
1203 dbg_tnc("found %d, lvl %d, n %d", exact, znode->level, *n);
1204 return exact;
1205 }
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250 err = tnc_prev(c, &znode, n);
1251 if (err == -ENOENT) {
1252 dbg_tnc("found 0, lvl %d, n -1", znode->level);
1253 *n = -1;
1254 return 0;
1255 }
1256 if (unlikely(err < 0))
1257 return err;
1258 if (keys_cmp(c, key, &znode->zbranch[*n].key)) {
1259 dbg_tnc("found 0, lvl %d, n -1", znode->level);
1260 *n = -1;
1261 return 0;
1262 }
1263
1264 dbg_tnc("found 1, lvl %d, n %d", znode->level, *n);
1265 *zn = znode;
1266 return 1;
1267}
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294static int lookup_level0_dirty(struct ubifs_info *c, const union ubifs_key *key,
1295 struct ubifs_znode **zn, int *n)
1296{
1297 int err, exact;
1298 struct ubifs_znode *znode;
1299 unsigned long time = get_seconds();
1300
1301 dbg_tnck(key, "search and dirty key ");
1302
1303 znode = c->zroot.znode;
1304 if (unlikely(!znode)) {
1305 znode = ubifs_load_znode(c, &c->zroot, NULL, 0);
1306 if (IS_ERR(znode))
1307 return PTR_ERR(znode);
1308 }
1309
1310 znode = dirty_cow_znode(c, &c->zroot);
1311 if (IS_ERR(znode))
1312 return PTR_ERR(znode);
1313
1314 znode->time = time;
1315
1316 while (1) {
1317 struct ubifs_zbranch *zbr;
1318
1319 exact = ubifs_search_zbranch(c, znode, key, n);
1320
1321 if (znode->level == 0)
1322 break;
1323
1324 if (*n < 0)
1325 *n = 0;
1326 zbr = &znode->zbranch[*n];
1327
1328 if (zbr->znode) {
1329 znode->time = time;
1330 znode = dirty_cow_znode(c, zbr);
1331 if (IS_ERR(znode))
1332 return PTR_ERR(znode);
1333 continue;
1334 }
1335
1336
1337 znode = ubifs_load_znode(c, zbr, znode, *n);
1338 if (IS_ERR(znode))
1339 return PTR_ERR(znode);
1340 znode = dirty_cow_znode(c, zbr);
1341 if (IS_ERR(znode))
1342 return PTR_ERR(znode);
1343 }
1344
1345 *zn = znode;
1346 if (exact || !is_hash_key(c, key) || *n != -1) {
1347 dbg_tnc("found %d, lvl %d, n %d", exact, znode->level, *n);
1348 return exact;
1349 }
1350
1351
1352
1353
1354
1355 err = tnc_prev(c, &znode, n);
1356 if (err == -ENOENT) {
1357 *n = -1;
1358 dbg_tnc("found 0, lvl %d, n -1", znode->level);
1359 return 0;
1360 }
1361 if (unlikely(err < 0))
1362 return err;
1363 if (keys_cmp(c, key, &znode->zbranch[*n].key)) {
1364 *n = -1;
1365 dbg_tnc("found 0, lvl %d, n -1", znode->level);
1366 return 0;
1367 }
1368
1369 if (znode->cnext || !ubifs_zn_dirty(znode)) {
1370 znode = dirty_cow_bottom_up(c, znode);
1371 if (IS_ERR(znode))
1372 return PTR_ERR(znode);
1373 }
1374
1375 dbg_tnc("found 1, lvl %d, n %d", znode->level, *n);
1376 *zn = znode;
1377 return 1;
1378}
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390static int maybe_leb_gced(struct ubifs_info *c, int lnum, int gc_seq1)
1391{
1392 int gc_seq2, gced_lnum;
1393
1394 gced_lnum = c->gced_lnum;
1395 smp_rmb();
1396 gc_seq2 = c->gc_seq;
1397
1398 if (gc_seq1 == gc_seq2)
1399 return 0;
1400
1401 if (gc_seq1 + 1 != gc_seq2)
1402 return 1;
1403
1404
1405
1406
1407 smp_rmb();
1408 if (gced_lnum != c->gced_lnum)
1409 return 1;
1410
1411 if (gced_lnum == lnum)
1412 return 1;
1413 return 0;
1414}
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429int ubifs_tnc_locate(struct ubifs_info *c, const union ubifs_key *key,
1430 void *node, int *lnum, int *offs)
1431{
1432 int found, n, err, safely = 0, gc_seq1;
1433 struct ubifs_znode *znode;
1434 struct ubifs_zbranch zbr, *zt;
1435
1436again:
1437 mutex_lock(&c->tnc_mutex);
1438 found = ubifs_lookup_level0(c, key, &znode, &n);
1439 if (!found) {
1440 err = -ENOENT;
1441 goto out;
1442 } else if (found < 0) {
1443 err = found;
1444 goto out;
1445 }
1446 zt = &znode->zbranch[n];
1447 if (lnum) {
1448 *lnum = zt->lnum;
1449 *offs = zt->offs;
1450 }
1451 if (is_hash_key(c, key)) {
1452
1453
1454
1455
1456 err = tnc_read_node_nm(c, zt, node);
1457 goto out;
1458 }
1459 if (safely) {
1460 err = ubifs_tnc_read_node(c, zt, node);
1461 goto out;
1462 }
1463
1464 zbr = znode->zbranch[n];
1465 gc_seq1 = c->gc_seq;
1466 mutex_unlock(&c->tnc_mutex);
1467
1468 if (ubifs_get_wbuf(c, zbr.lnum)) {
1469
1470 err = ubifs_tnc_read_node(c, &zbr, node);
1471 return err;
1472 }
1473
1474 err = fallible_read_node(c, key, &zbr, node);
1475 if (err <= 0 || maybe_leb_gced(c, zbr.lnum, gc_seq1)) {
1476
1477
1478
1479
1480 safely = 1;
1481 goto again;
1482 }
1483 return 0;
1484
1485out:
1486 mutex_unlock(&c->tnc_mutex);
1487 return err;
1488}
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503int ubifs_tnc_get_bu_keys(struct ubifs_info *c, struct bu_info *bu)
1504{
1505 int n, err = 0, lnum = -1, uninitialized_var(offs);
1506 int uninitialized_var(len);
1507 unsigned int block = key_block(c, &bu->key);
1508 struct ubifs_znode *znode;
1509
1510 bu->cnt = 0;
1511 bu->blk_cnt = 0;
1512 bu->eof = 0;
1513
1514 mutex_lock(&c->tnc_mutex);
1515
1516 err = ubifs_lookup_level0(c, &bu->key, &znode, &n);
1517 if (err < 0)
1518 goto out;
1519 if (err) {
1520
1521 len = znode->zbranch[n].len;
1522
1523 if (len > bu->buf_len) {
1524 err = -EINVAL;
1525 goto out;
1526 }
1527
1528 bu->zbranch[bu->cnt++] = znode->zbranch[n];
1529 bu->blk_cnt += 1;
1530 lnum = znode->zbranch[n].lnum;
1531 offs = ALIGN(znode->zbranch[n].offs + len, 8);
1532 }
1533 while (1) {
1534 struct ubifs_zbranch *zbr;
1535 union ubifs_key *key;
1536 unsigned int next_block;
1537
1538
1539 err = tnc_next(c, &znode, &n);
1540 if (err)
1541 goto out;
1542 zbr = &znode->zbranch[n];
1543 key = &zbr->key;
1544
1545 if (key_inum(c, key) != key_inum(c, &bu->key) ||
1546 key_type(c, key) != UBIFS_DATA_KEY) {
1547 err = -ENOENT;
1548 goto out;
1549 }
1550 if (lnum < 0) {
1551
1552 lnum = zbr->lnum;
1553 offs = ALIGN(zbr->offs + zbr->len, 8);
1554 len = zbr->len;
1555 if (len > bu->buf_len) {
1556 err = -EINVAL;
1557 goto out;
1558 }
1559 } else {
1560
1561
1562
1563
1564 if (zbr->lnum != lnum || zbr->offs != offs)
1565 goto out;
1566 offs += ALIGN(zbr->len, 8);
1567 len = ALIGN(len, 8) + zbr->len;
1568
1569 if (len > bu->buf_len)
1570 goto out;
1571 }
1572
1573 next_block = key_block(c, key);
1574 bu->blk_cnt += (next_block - block - 1);
1575 if (bu->blk_cnt >= UBIFS_MAX_BULK_READ)
1576 goto out;
1577 block = next_block;
1578
1579 bu->zbranch[bu->cnt++] = *zbr;
1580 bu->blk_cnt += 1;
1581
1582 if (bu->cnt >= UBIFS_MAX_BULK_READ)
1583 goto out;
1584 if (bu->blk_cnt >= UBIFS_MAX_BULK_READ)
1585 goto out;
1586 }
1587out:
1588 if (err == -ENOENT) {
1589 bu->eof = 1;
1590 err = 0;
1591 }
1592 bu->gc_seq = c->gc_seq;
1593 mutex_unlock(&c->tnc_mutex);
1594 if (err)
1595 return err;
1596
1597
1598
1599
1600 if (bu->blk_cnt > UBIFS_MAX_BULK_READ)
1601 bu->blk_cnt = UBIFS_MAX_BULK_READ;
1602
1603
1604
1605
1606 if (UBIFS_BLOCKS_PER_PAGE == 1 ||
1607 !(bu->blk_cnt & (UBIFS_BLOCKS_PER_PAGE - 1)))
1608 return 0;
1609 if (bu->eof) {
1610
1611 bu->blk_cnt += UBIFS_BLOCKS_PER_PAGE - 1;
1612 return 0;
1613 }
1614
1615 block = key_block(c, &bu->key) + bu->blk_cnt;
1616 block &= ~(UBIFS_BLOCKS_PER_PAGE - 1);
1617 while (bu->cnt) {
1618 if (key_block(c, &bu->zbranch[bu->cnt - 1].key) < block)
1619 break;
1620 bu->cnt -= 1;
1621 }
1622 return 0;
1623}
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635static int read_wbuf(struct ubifs_wbuf *wbuf, void *buf, int len, int lnum,
1636 int offs)
1637{
1638 const struct ubifs_info *c = wbuf->c;
1639 int rlen, overlap;
1640
1641 dbg_io("LEB %d:%d, length %d", lnum, offs, len);
1642 ubifs_assert(wbuf && lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
1643 ubifs_assert(!(offs & 7) && offs < c->leb_size);
1644 ubifs_assert(offs + len <= c->leb_size);
1645
1646 spin_lock(&wbuf->lock);
1647 overlap = (lnum == wbuf->lnum && offs + len > wbuf->offs);
1648 if (!overlap) {
1649
1650 spin_unlock(&wbuf->lock);
1651 return ubifs_leb_read(c, lnum, buf, offs, len, 0);
1652 }
1653
1654
1655 rlen = wbuf->offs - offs;
1656 if (rlen < 0)
1657 rlen = 0;
1658
1659
1660 memcpy(buf + rlen, wbuf->buf + offs + rlen - wbuf->offs, len - rlen);
1661 spin_unlock(&wbuf->lock);
1662
1663 if (rlen > 0)
1664
1665 return ubifs_leb_read(c, lnum, buf, offs, rlen, 0);
1666
1667 return 0;
1668}
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678static int validate_data_node(struct ubifs_info *c, void *buf,
1679 struct ubifs_zbranch *zbr)
1680{
1681 union ubifs_key key1;
1682 struct ubifs_ch *ch = buf;
1683 int err, len;
1684
1685 if (ch->node_type != UBIFS_DATA_NODE) {
1686 ubifs_err(c, "bad node type (%d but expected %d)",
1687 ch->node_type, UBIFS_DATA_NODE);
1688 goto out_err;
1689 }
1690
1691 err = ubifs_check_node(c, buf, zbr->lnum, zbr->offs, 0, 0);
1692 if (err) {
1693 ubifs_err(c, "expected node type %d", UBIFS_DATA_NODE);
1694 goto out;
1695 }
1696
1697 len = le32_to_cpu(ch->len);
1698 if (len != zbr->len) {
1699 ubifs_err(c, "bad node length %d, expected %d", len, zbr->len);
1700 goto out_err;
1701 }
1702
1703
1704 key_read(c, buf + UBIFS_KEY_OFFSET, &key1);
1705 if (!keys_eq(c, &zbr->key, &key1)) {
1706 ubifs_err(c, "bad key in node at LEB %d:%d",
1707 zbr->lnum, zbr->offs);
1708 dbg_tnck(&zbr->key, "looked for key ");
1709 dbg_tnck(&key1, "found node's key ");
1710 goto out_err;
1711 }
1712
1713 return 0;
1714
1715out_err:
1716 err = -EINVAL;
1717out:
1718 ubifs_err(c, "bad node at LEB %d:%d", zbr->lnum, zbr->offs);
1719 ubifs_dump_node(c, buf);
1720 dump_stack();
1721 return err;
1722}
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734int ubifs_tnc_bulk_read(struct ubifs_info *c, struct bu_info *bu)
1735{
1736 int lnum = bu->zbranch[0].lnum, offs = bu->zbranch[0].offs, len, err, i;
1737 struct ubifs_wbuf *wbuf;
1738 void *buf;
1739
1740 len = bu->zbranch[bu->cnt - 1].offs;
1741 len += bu->zbranch[bu->cnt - 1].len - offs;
1742 if (len > bu->buf_len) {
1743 ubifs_err(c, "buffer too small %d vs %d", bu->buf_len, len);
1744 return -EINVAL;
1745 }
1746
1747
1748 wbuf = ubifs_get_wbuf(c, lnum);
1749 if (wbuf)
1750 err = read_wbuf(wbuf, bu->buf, len, lnum, offs);
1751 else
1752 err = ubifs_leb_read(c, lnum, bu->buf, offs, len, 0);
1753
1754
1755 if (maybe_leb_gced(c, lnum, bu->gc_seq))
1756 return -EAGAIN;
1757
1758 if (err && err != -EBADMSG) {
1759 ubifs_err(c, "failed to read from LEB %d:%d, error %d",
1760 lnum, offs, err);
1761 dump_stack();
1762 dbg_tnck(&bu->key, "key ");
1763 return err;
1764 }
1765
1766
1767 buf = bu->buf;
1768 for (i = 0; i < bu->cnt; i++) {
1769 err = validate_data_node(c, buf, &bu->zbranch[i]);
1770 if (err)
1771 return err;
1772 buf = buf + ALIGN(bu->zbranch[i].len, 8);
1773 }
1774
1775 return 0;
1776}
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791static int do_lookup_nm(struct ubifs_info *c, const union ubifs_key *key,
1792 void *node, const struct qstr *nm)
1793{
1794 int found, n, err;
1795 struct ubifs_znode *znode;
1796
1797 dbg_tnck(key, "name '%.*s' key ", nm->len, nm->name);
1798 mutex_lock(&c->tnc_mutex);
1799 found = ubifs_lookup_level0(c, key, &znode, &n);
1800 if (!found) {
1801 err = -ENOENT;
1802 goto out_unlock;
1803 } else if (found < 0) {
1804 err = found;
1805 goto out_unlock;
1806 }
1807
1808 ubifs_assert(n >= 0);
1809
1810 err = resolve_collision(c, key, &znode, &n, nm);
1811 dbg_tnc("rc returned %d, znode %p, n %d", err, znode, n);
1812 if (unlikely(err < 0))
1813 goto out_unlock;
1814 if (err == 0) {
1815 err = -ENOENT;
1816 goto out_unlock;
1817 }
1818
1819 err = tnc_read_node_nm(c, &znode->zbranch[n], node);
1820
1821out_unlock:
1822 mutex_unlock(&c->tnc_mutex);
1823 return err;
1824}
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839int ubifs_tnc_lookup_nm(struct ubifs_info *c, const union ubifs_key *key,
1840 void *node, const struct qstr *nm)
1841{
1842 int err, len;
1843 const struct ubifs_dent_node *dent = node;
1844
1845
1846
1847
1848
1849 err = ubifs_tnc_lookup(c, key, node);
1850 if (err)
1851 return err;
1852
1853 len = le16_to_cpu(dent->nlen);
1854 if (nm->len == len && !memcmp(dent->name, nm->name, len))
1855 return 0;
1856
1857
1858
1859
1860
1861 return do_lookup_nm(c, key, node, nm);
1862}
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873static void correct_parent_keys(const struct ubifs_info *c,
1874 struct ubifs_znode *znode)
1875{
1876 union ubifs_key *key, *key1;
1877
1878 ubifs_assert(znode->parent);
1879 ubifs_assert(znode->iip == 0);
1880
1881 key = &znode->zbranch[0].key;
1882 key1 = &znode->parent->zbranch[0].key;
1883
1884 while (keys_cmp(c, key, key1) < 0) {
1885 key_copy(c, key, key1);
1886 znode = znode->parent;
1887 znode->alt = 1;
1888 if (!znode->parent || znode->iip)
1889 break;
1890 key1 = &znode->parent->zbranch[0].key;
1891 }
1892}
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905static void insert_zbranch(struct ubifs_znode *znode,
1906 const struct ubifs_zbranch *zbr, int n)
1907{
1908 int i;
1909
1910 ubifs_assert(ubifs_zn_dirty(znode));
1911
1912 if (znode->level) {
1913 for (i = znode->child_cnt; i > n; i--) {
1914 znode->zbranch[i] = znode->zbranch[i - 1];
1915 if (znode->zbranch[i].znode)
1916 znode->zbranch[i].znode->iip = i;
1917 }
1918 if (zbr->znode)
1919 zbr->znode->iip = n;
1920 } else
1921 for (i = znode->child_cnt; i > n; i--)
1922 znode->zbranch[i] = znode->zbranch[i - 1];
1923
1924 znode->zbranch[n] = *zbr;
1925 znode->child_cnt += 1;
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941 if (n == 0)
1942 znode->alt = 1;
1943}
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957static int tnc_insert(struct ubifs_info *c, struct ubifs_znode *znode,
1958 struct ubifs_zbranch *zbr, int n)
1959{
1960 struct ubifs_znode *zn, *zi, *zp;
1961 int i, keep, move, appending = 0;
1962 union ubifs_key *key = &zbr->key, *key1;
1963
1964 ubifs_assert(n >= 0 && n <= c->fanout);
1965
1966
1967again:
1968 zp = znode->parent;
1969 if (znode->child_cnt < c->fanout) {
1970 ubifs_assert(n != c->fanout);
1971 dbg_tnck(key, "inserted at %d level %d, key ", n, znode->level);
1972
1973 insert_zbranch(znode, zbr, n);
1974
1975
1976 if (n == 0 && zp && znode->iip == 0)
1977 correct_parent_keys(c, znode);
1978
1979 return 0;
1980 }
1981
1982
1983
1984
1985
1986 dbg_tnck(key, "splitting level %d, key ", znode->level);
1987
1988 if (znode->alt)
1989
1990
1991
1992
1993 ins_clr_old_idx_znode(c, znode);
1994
1995 zn = kzalloc(c->max_znode_sz, GFP_NOFS);
1996 if (!zn)
1997 return -ENOMEM;
1998 zn->parent = zp;
1999 zn->level = znode->level;
2000
2001
2002 if (znode->level == 0 && key_type(c, key) == UBIFS_DATA_KEY) {
2003
2004 if (n == c->fanout) {
2005 key1 = &znode->zbranch[n - 1].key;
2006 if (key_inum(c, key1) == key_inum(c, key) &&
2007 key_type(c, key1) == UBIFS_DATA_KEY)
2008 appending = 1;
2009 } else
2010 goto check_split;
2011 } else if (appending && n != c->fanout) {
2012
2013 appending = 0;
2014check_split:
2015 if (n >= (c->fanout + 1) / 2) {
2016 key1 = &znode->zbranch[0].key;
2017 if (key_inum(c, key1) == key_inum(c, key) &&
2018 key_type(c, key1) == UBIFS_DATA_KEY) {
2019 key1 = &znode->zbranch[n].key;
2020 if (key_inum(c, key1) != key_inum(c, key) ||
2021 key_type(c, key1) != UBIFS_DATA_KEY) {
2022 keep = n;
2023 move = c->fanout - keep;
2024 zi = znode;
2025 goto do_split;
2026 }
2027 }
2028 }
2029 }
2030
2031 if (appending) {
2032 keep = c->fanout;
2033 move = 0;
2034 } else {
2035 keep = (c->fanout + 1) / 2;
2036 move = c->fanout - keep;
2037 }
2038
2039
2040
2041
2042
2043
2044 if (n < keep) {
2045
2046 zi = znode;
2047 move += 1;
2048 keep -= 1;
2049 } else {
2050
2051 zi = zn;
2052 n -= keep;
2053
2054 if (zn->level != 0)
2055 zbr->znode->parent = zn;
2056 }
2057
2058do_split:
2059
2060 __set_bit(DIRTY_ZNODE, &zn->flags);
2061 atomic_long_inc(&c->dirty_zn_cnt);
2062
2063 zn->child_cnt = move;
2064 znode->child_cnt = keep;
2065
2066 dbg_tnc("moving %d, keeping %d", move, keep);
2067
2068
2069 for (i = 0; i < move; i++) {
2070 zn->zbranch[i] = znode->zbranch[keep + i];
2071
2072 if (zn->level != 0)
2073 if (zn->zbranch[i].znode) {
2074 zn->zbranch[i].znode->parent = zn;
2075 zn->zbranch[i].znode->iip = i;
2076 }
2077 }
2078
2079
2080 dbg_tnck(key, "inserting at %d level %d, key ", n, zn->level);
2081
2082 insert_zbranch(zi, zbr, n);
2083
2084
2085 if (zp) {
2086 if (n == 0 && zi == znode && znode->iip == 0)
2087 correct_parent_keys(c, znode);
2088
2089
2090 n = znode->iip + 1;
2091
2092
2093 zbr->key = zn->zbranch[0].key;
2094 zbr->znode = zn;
2095 zbr->lnum = 0;
2096 zbr->offs = 0;
2097 zbr->len = 0;
2098 znode = zp;
2099
2100 goto again;
2101 }
2102
2103
2104 dbg_tnc("creating new zroot at level %d", znode->level + 1);
2105
2106 zi = kzalloc(c->max_znode_sz, GFP_NOFS);
2107 if (!zi)
2108 return -ENOMEM;
2109
2110 zi->child_cnt = 2;
2111 zi->level = znode->level + 1;
2112
2113 __set_bit(DIRTY_ZNODE, &zi->flags);
2114 atomic_long_inc(&c->dirty_zn_cnt);
2115
2116 zi->zbranch[0].key = znode->zbranch[0].key;
2117 zi->zbranch[0].znode = znode;
2118 zi->zbranch[0].lnum = c->zroot.lnum;
2119 zi->zbranch[0].offs = c->zroot.offs;
2120 zi->zbranch[0].len = c->zroot.len;
2121 zi->zbranch[1].key = zn->zbranch[0].key;
2122 zi->zbranch[1].znode = zn;
2123
2124 c->zroot.lnum = 0;
2125 c->zroot.offs = 0;
2126 c->zroot.len = 0;
2127 c->zroot.znode = zi;
2128
2129 zn->parent = zi;
2130 zn->iip = 1;
2131 znode->parent = zi;
2132 znode->iip = 0;
2133
2134 return 0;
2135}
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149int ubifs_tnc_add(struct ubifs_info *c, const union ubifs_key *key, int lnum,
2150 int offs, int len)
2151{
2152 int found, n, err = 0;
2153 struct ubifs_znode *znode;
2154
2155 mutex_lock(&c->tnc_mutex);
2156 dbg_tnck(key, "%d:%d, len %d, key ", lnum, offs, len);
2157 found = lookup_level0_dirty(c, key, &znode, &n);
2158 if (!found) {
2159 struct ubifs_zbranch zbr;
2160
2161 zbr.znode = NULL;
2162 zbr.lnum = lnum;
2163 zbr.offs = offs;
2164 zbr.len = len;
2165 key_copy(c, key, &zbr.key);
2166 err = tnc_insert(c, znode, &zbr, n + 1);
2167 } else if (found == 1) {
2168 struct ubifs_zbranch *zbr = &znode->zbranch[n];
2169
2170 lnc_free(zbr);
2171 err = ubifs_add_dirt(c, zbr->lnum, zbr->len);
2172 zbr->lnum = lnum;
2173 zbr->offs = offs;
2174 zbr->len = len;
2175 } else
2176 err = found;
2177 if (!err)
2178 err = dbg_check_tnc(c, 0);
2179 mutex_unlock(&c->tnc_mutex);
2180
2181 return err;
2182}
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198int ubifs_tnc_replace(struct ubifs_info *c, const union ubifs_key *key,
2199 int old_lnum, int old_offs, int lnum, int offs, int len)
2200{
2201 int found, n, err = 0;
2202 struct ubifs_znode *znode;
2203
2204 mutex_lock(&c->tnc_mutex);
2205 dbg_tnck(key, "old LEB %d:%d, new LEB %d:%d, len %d, key ", old_lnum,
2206 old_offs, lnum, offs, len);
2207 found = lookup_level0_dirty(c, key, &znode, &n);
2208 if (found < 0) {
2209 err = found;
2210 goto out_unlock;
2211 }
2212
2213 if (found == 1) {
2214 struct ubifs_zbranch *zbr = &znode->zbranch[n];
2215
2216 found = 0;
2217 if (zbr->lnum == old_lnum && zbr->offs == old_offs) {
2218 lnc_free(zbr);
2219 err = ubifs_add_dirt(c, zbr->lnum, zbr->len);
2220 if (err)
2221 goto out_unlock;
2222 zbr->lnum = lnum;
2223 zbr->offs = offs;
2224 zbr->len = len;
2225 found = 1;
2226 } else if (is_hash_key(c, key)) {
2227 found = resolve_collision_directly(c, key, &znode, &n,
2228 old_lnum, old_offs);
2229 dbg_tnc("rc returned %d, znode %p, n %d, LEB %d:%d",
2230 found, znode, n, old_lnum, old_offs);
2231 if (found < 0) {
2232 err = found;
2233 goto out_unlock;
2234 }
2235
2236 if (found) {
2237
2238 if (znode->cnext || !ubifs_zn_dirty(znode)) {
2239 znode = dirty_cow_bottom_up(c, znode);
2240 if (IS_ERR(znode)) {
2241 err = PTR_ERR(znode);
2242 goto out_unlock;
2243 }
2244 }
2245 zbr = &znode->zbranch[n];
2246 lnc_free(zbr);
2247 err = ubifs_add_dirt(c, zbr->lnum,
2248 zbr->len);
2249 if (err)
2250 goto out_unlock;
2251 zbr->lnum = lnum;
2252 zbr->offs = offs;
2253 zbr->len = len;
2254 }
2255 }
2256 }
2257
2258 if (!found)
2259 err = ubifs_add_dirt(c, lnum, len);
2260
2261 if (!err)
2262 err = dbg_check_tnc(c, 0);
2263
2264out_unlock:
2265 mutex_unlock(&c->tnc_mutex);
2266 return err;
2267}
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281int ubifs_tnc_add_nm(struct ubifs_info *c, const union ubifs_key *key,
2282 int lnum, int offs, int len, const struct qstr *nm)
2283{
2284 int found, n, err = 0;
2285 struct ubifs_znode *znode;
2286
2287 mutex_lock(&c->tnc_mutex);
2288 dbg_tnck(key, "LEB %d:%d, name '%.*s', key ",
2289 lnum, offs, nm->len, nm->name);
2290 found = lookup_level0_dirty(c, key, &znode, &n);
2291 if (found < 0) {
2292 err = found;
2293 goto out_unlock;
2294 }
2295
2296 if (found == 1) {
2297 if (c->replaying)
2298 found = fallible_resolve_collision(c, key, &znode, &n,
2299 nm, 1);
2300 else
2301 found = resolve_collision(c, key, &znode, &n, nm);
2302 dbg_tnc("rc returned %d, znode %p, n %d", found, znode, n);
2303 if (found < 0) {
2304 err = found;
2305 goto out_unlock;
2306 }
2307
2308
2309 if (znode->cnext || !ubifs_zn_dirty(znode)) {
2310 znode = dirty_cow_bottom_up(c, znode);
2311 if (IS_ERR(znode)) {
2312 err = PTR_ERR(znode);
2313 goto out_unlock;
2314 }
2315 }
2316
2317 if (found == 1) {
2318 struct ubifs_zbranch *zbr = &znode->zbranch[n];
2319
2320 lnc_free(zbr);
2321 err = ubifs_add_dirt(c, zbr->lnum, zbr->len);
2322 zbr->lnum = lnum;
2323 zbr->offs = offs;
2324 zbr->len = len;
2325 goto out_unlock;
2326 }
2327 }
2328
2329 if (!found) {
2330 struct ubifs_zbranch zbr;
2331
2332 zbr.znode = NULL;
2333 zbr.lnum = lnum;
2334 zbr.offs = offs;
2335 zbr.len = len;
2336 key_copy(c, key, &zbr.key);
2337 err = tnc_insert(c, znode, &zbr, n + 1);
2338 if (err)
2339 goto out_unlock;
2340 if (c->replaying) {
2341
2342
2343
2344
2345
2346
2347 struct qstr noname = { .name = "" };
2348
2349 err = dbg_check_tnc(c, 0);
2350 mutex_unlock(&c->tnc_mutex);
2351 if (err)
2352 return err;
2353 return ubifs_tnc_remove_nm(c, key, &noname);
2354 }
2355 }
2356
2357out_unlock:
2358 if (!err)
2359 err = dbg_check_tnc(c, 0);
2360 mutex_unlock(&c->tnc_mutex);
2361 return err;
2362}
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373static int tnc_delete(struct ubifs_info *c, struct ubifs_znode *znode, int n)
2374{
2375 struct ubifs_zbranch *zbr;
2376 struct ubifs_znode *zp;
2377 int i, err;
2378
2379
2380 ubifs_assert(znode->level == 0);
2381 ubifs_assert(n >= 0 && n < c->fanout);
2382 dbg_tnck(&znode->zbranch[n].key, "deleting key ");
2383
2384 zbr = &znode->zbranch[n];
2385 lnc_free(zbr);
2386
2387 err = ubifs_add_dirt(c, zbr->lnum, zbr->len);
2388 if (err) {
2389 ubifs_dump_znode(c, znode);
2390 return err;
2391 }
2392
2393
2394 for (i = n; i < znode->child_cnt - 1; i++)
2395 znode->zbranch[i] = znode->zbranch[i + 1];
2396 znode->child_cnt -= 1;
2397
2398 if (znode->child_cnt > 0)
2399 return 0;
2400
2401
2402
2403
2404
2405
2406 do {
2407 ubifs_assert(!ubifs_zn_obsolete(znode));
2408 ubifs_assert(ubifs_zn_dirty(znode));
2409
2410 zp = znode->parent;
2411 n = znode->iip;
2412
2413 atomic_long_dec(&c->dirty_zn_cnt);
2414
2415 err = insert_old_idx_znode(c, znode);
2416 if (err)
2417 return err;
2418
2419 if (znode->cnext) {
2420 __set_bit(OBSOLETE_ZNODE, &znode->flags);
2421 atomic_long_inc(&c->clean_zn_cnt);
2422 atomic_long_inc(&ubifs_clean_zn_cnt);
2423 } else
2424 kfree(znode);
2425 znode = zp;
2426 } while (znode->child_cnt == 1);
2427
2428
2429 znode->child_cnt -= 1;
2430 ubifs_assert(znode->level != 0);
2431 for (i = n; i < znode->child_cnt; i++) {
2432 znode->zbranch[i] = znode->zbranch[i + 1];
2433 if (znode->zbranch[i].znode)
2434 znode->zbranch[i].znode->iip = i;
2435 }
2436
2437
2438
2439
2440
2441 if (!znode->parent) {
2442 while (znode->child_cnt == 1 && znode->level != 0) {
2443 zp = znode;
2444 zbr = &znode->zbranch[0];
2445 znode = get_znode(c, znode, 0);
2446 if (IS_ERR(znode))
2447 return PTR_ERR(znode);
2448 znode = dirty_cow_znode(c, zbr);
2449 if (IS_ERR(znode))
2450 return PTR_ERR(znode);
2451 znode->parent = NULL;
2452 znode->iip = 0;
2453 if (c->zroot.len) {
2454 err = insert_old_idx(c, c->zroot.lnum,
2455 c->zroot.offs);
2456 if (err)
2457 return err;
2458 }
2459 c->zroot.lnum = zbr->lnum;
2460 c->zroot.offs = zbr->offs;
2461 c->zroot.len = zbr->len;
2462 c->zroot.znode = znode;
2463 ubifs_assert(!ubifs_zn_obsolete(zp));
2464 ubifs_assert(ubifs_zn_dirty(zp));
2465 atomic_long_dec(&c->dirty_zn_cnt);
2466
2467 if (zp->cnext) {
2468 __set_bit(OBSOLETE_ZNODE, &zp->flags);
2469 atomic_long_inc(&c->clean_zn_cnt);
2470 atomic_long_inc(&ubifs_clean_zn_cnt);
2471 } else
2472 kfree(zp);
2473 }
2474 }
2475
2476 return 0;
2477}
2478
2479
2480
2481
2482
2483
2484
2485
2486int ubifs_tnc_remove(struct ubifs_info *c, const union ubifs_key *key)
2487{
2488 int found, n, err = 0;
2489 struct ubifs_znode *znode;
2490
2491 mutex_lock(&c->tnc_mutex);
2492 dbg_tnck(key, "key ");
2493 found = lookup_level0_dirty(c, key, &znode, &n);
2494 if (found < 0) {
2495 err = found;
2496 goto out_unlock;
2497 }
2498 if (found == 1)
2499 err = tnc_delete(c, znode, n);
2500 if (!err)
2501 err = dbg_check_tnc(c, 0);
2502
2503out_unlock:
2504 mutex_unlock(&c->tnc_mutex);
2505 return err;
2506}
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516int ubifs_tnc_remove_nm(struct ubifs_info *c, const union ubifs_key *key,
2517 const struct qstr *nm)
2518{
2519 int n, err;
2520 struct ubifs_znode *znode;
2521
2522 mutex_lock(&c->tnc_mutex);
2523 dbg_tnck(key, "%.*s, key ", nm->len, nm->name);
2524 err = lookup_level0_dirty(c, key, &znode, &n);
2525 if (err < 0)
2526 goto out_unlock;
2527
2528 if (err) {
2529 if (c->replaying)
2530 err = fallible_resolve_collision(c, key, &znode, &n,
2531 nm, 0);
2532 else
2533 err = resolve_collision(c, key, &znode, &n, nm);
2534 dbg_tnc("rc returned %d, znode %p, n %d", err, znode, n);
2535 if (err < 0)
2536 goto out_unlock;
2537 if (err) {
2538
2539 if (znode->cnext || !ubifs_zn_dirty(znode)) {
2540 znode = dirty_cow_bottom_up(c, znode);
2541 if (IS_ERR(znode)) {
2542 err = PTR_ERR(znode);
2543 goto out_unlock;
2544 }
2545 }
2546 err = tnc_delete(c, znode, n);
2547 }
2548 }
2549
2550out_unlock:
2551 if (!err)
2552 err = dbg_check_tnc(c, 0);
2553 mutex_unlock(&c->tnc_mutex);
2554 return err;
2555}
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566static int key_in_range(struct ubifs_info *c, union ubifs_key *key,
2567 union ubifs_key *from_key, union ubifs_key *to_key)
2568{
2569 if (keys_cmp(c, key, from_key) < 0)
2570 return 0;
2571 if (keys_cmp(c, key, to_key) > 0)
2572 return 0;
2573 return 1;
2574}
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586int ubifs_tnc_remove_range(struct ubifs_info *c, union ubifs_key *from_key,
2587 union ubifs_key *to_key)
2588{
2589 int i, n, k, err = 0;
2590 struct ubifs_znode *znode;
2591 union ubifs_key *key;
2592
2593 mutex_lock(&c->tnc_mutex);
2594 while (1) {
2595
2596 err = ubifs_lookup_level0(c, from_key, &znode, &n);
2597 if (err < 0)
2598 goto out_unlock;
2599
2600 if (err)
2601 key = from_key;
2602 else {
2603 err = tnc_next(c, &znode, &n);
2604 if (err == -ENOENT) {
2605 err = 0;
2606 goto out_unlock;
2607 }
2608 if (err < 0)
2609 goto out_unlock;
2610 key = &znode->zbranch[n].key;
2611 if (!key_in_range(c, key, from_key, to_key)) {
2612 err = 0;
2613 goto out_unlock;
2614 }
2615 }
2616
2617
2618 if (znode->cnext || !ubifs_zn_dirty(znode)) {
2619 znode = dirty_cow_bottom_up(c, znode);
2620 if (IS_ERR(znode)) {
2621 err = PTR_ERR(znode);
2622 goto out_unlock;
2623 }
2624 }
2625
2626
2627 for (i = n + 1, k = 0; i < znode->child_cnt; i++, k++) {
2628 key = &znode->zbranch[i].key;
2629 if (!key_in_range(c, key, from_key, to_key))
2630 break;
2631 lnc_free(&znode->zbranch[i]);
2632 err = ubifs_add_dirt(c, znode->zbranch[i].lnum,
2633 znode->zbranch[i].len);
2634 if (err) {
2635 ubifs_dump_znode(c, znode);
2636 goto out_unlock;
2637 }
2638 dbg_tnck(key, "removing key ");
2639 }
2640 if (k) {
2641 for (i = n + 1 + k; i < znode->child_cnt; i++)
2642 znode->zbranch[i - k] = znode->zbranch[i];
2643 znode->child_cnt -= k;
2644 }
2645
2646
2647 err = tnc_delete(c, znode, n);
2648 if (err)
2649 goto out_unlock;
2650 }
2651
2652out_unlock:
2653 if (!err)
2654 err = dbg_check_tnc(c, 0);
2655 mutex_unlock(&c->tnc_mutex);
2656 return err;
2657}
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668int ubifs_tnc_remove_ino(struct ubifs_info *c, ino_t inum)
2669{
2670 union ubifs_key key1, key2;
2671 struct ubifs_dent_node *xent, *pxent = NULL;
2672 struct qstr nm = { .name = NULL };
2673
2674 dbg_tnc("ino %lu", (unsigned long)inum);
2675
2676
2677
2678
2679
2680 lowest_xent_key(c, &key1, inum);
2681 while (1) {
2682 ino_t xattr_inum;
2683 int err;
2684
2685 xent = ubifs_tnc_next_ent(c, &key1, &nm);
2686 if (IS_ERR(xent)) {
2687 err = PTR_ERR(xent);
2688 if (err == -ENOENT)
2689 break;
2690 return err;
2691 }
2692
2693 xattr_inum = le64_to_cpu(xent->inum);
2694 dbg_tnc("xent '%s', ino %lu", xent->name,
2695 (unsigned long)xattr_inum);
2696
2697 nm.name = xent->name;
2698 nm.len = le16_to_cpu(xent->nlen);
2699 err = ubifs_tnc_remove_nm(c, &key1, &nm);
2700 if (err) {
2701 kfree(xent);
2702 return err;
2703 }
2704
2705 lowest_ino_key(c, &key1, xattr_inum);
2706 highest_ino_key(c, &key2, xattr_inum);
2707 err = ubifs_tnc_remove_range(c, &key1, &key2);
2708 if (err) {
2709 kfree(xent);
2710 return err;
2711 }
2712
2713 kfree(pxent);
2714 pxent = xent;
2715 key_read(c, &xent->key, &key1);
2716 }
2717
2718 kfree(pxent);
2719 lowest_ino_key(c, &key1, inum);
2720 highest_ino_key(c, &key2, inum);
2721
2722 return ubifs_tnc_remove_range(c, &key1, &key2);
2723}
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748struct ubifs_dent_node *ubifs_tnc_next_ent(struct ubifs_info *c,
2749 union ubifs_key *key,
2750 const struct qstr *nm)
2751{
2752 int n, err, type = key_type(c, key);
2753 struct ubifs_znode *znode;
2754 struct ubifs_dent_node *dent;
2755 struct ubifs_zbranch *zbr;
2756 union ubifs_key *dkey;
2757
2758 dbg_tnck(key, "%s ", nm->name ? (char *)nm->name : "(lowest)");
2759 ubifs_assert(is_hash_key(c, key));
2760
2761 mutex_lock(&c->tnc_mutex);
2762 err = ubifs_lookup_level0(c, key, &znode, &n);
2763 if (unlikely(err < 0))
2764 goto out_unlock;
2765
2766 if (nm->name) {
2767 if (err) {
2768
2769 err = resolve_collision(c, key, &znode, &n, nm);
2770 dbg_tnc("rc returned %d, znode %p, n %d",
2771 err, znode, n);
2772 if (unlikely(err < 0))
2773 goto out_unlock;
2774 }
2775
2776
2777 err = tnc_next(c, &znode, &n);
2778 if (unlikely(err))
2779 goto out_unlock;
2780 } else {
2781
2782
2783
2784
2785
2786 if (!err) {
2787
2788
2789
2790
2791
2792 err = tnc_next(c, &znode, &n);
2793 if (err)
2794 goto out_unlock;
2795 }
2796 }
2797
2798 zbr = &znode->zbranch[n];
2799 dent = kmalloc(zbr->len, GFP_NOFS);
2800 if (unlikely(!dent)) {
2801 err = -ENOMEM;
2802 goto out_unlock;
2803 }
2804
2805
2806
2807
2808
2809 dkey = &zbr->key;
2810 if (key_inum(c, dkey) != key_inum(c, key) ||
2811 key_type(c, dkey) != type) {
2812 err = -ENOENT;
2813 goto out_free;
2814 }
2815
2816 err = tnc_read_node_nm(c, zbr, dent);
2817 if (unlikely(err))
2818 goto out_free;
2819
2820 mutex_unlock(&c->tnc_mutex);
2821 return dent;
2822
2823out_free:
2824 kfree(dent);
2825out_unlock:
2826 mutex_unlock(&c->tnc_mutex);
2827 return ERR_PTR(err);
2828}
2829
2830
2831
2832
2833
2834
2835
2836static void tnc_destroy_cnext(struct ubifs_info *c)
2837{
2838 struct ubifs_znode *cnext;
2839
2840 if (!c->cnext)
2841 return;
2842 ubifs_assert(c->cmt_state == COMMIT_BROKEN);
2843 cnext = c->cnext;
2844 do {
2845 struct ubifs_znode *znode = cnext;
2846
2847 cnext = cnext->cnext;
2848 if (ubifs_zn_obsolete(znode))
2849 kfree(znode);
2850 } while (cnext && cnext != c->cnext);
2851}
2852
2853
2854
2855
2856
2857void ubifs_tnc_close(struct ubifs_info *c)
2858{
2859 tnc_destroy_cnext(c);
2860 if (c->zroot.znode) {
2861 long n, freed;
2862
2863 n = atomic_long_read(&c->clean_zn_cnt);
2864 freed = ubifs_destroy_tnc_subtree(c->zroot.znode);
2865 ubifs_assert(freed == n);
2866 atomic_long_sub(n, &ubifs_clean_zn_cnt);
2867 }
2868 kfree(c->gap_lebs);
2869 kfree(c->ilebs);
2870 destroy_old_idx(c);
2871}
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881static struct ubifs_znode *left_znode(struct ubifs_info *c,
2882 struct ubifs_znode *znode)
2883{
2884 int level = znode->level;
2885
2886 while (1) {
2887 int n = znode->iip - 1;
2888
2889
2890 znode = znode->parent;
2891 if (!znode)
2892 return NULL;
2893 if (n >= 0) {
2894
2895 znode = get_znode(c, znode, n);
2896 if (IS_ERR(znode))
2897 return znode;
2898 while (znode->level != level) {
2899 n = znode->child_cnt - 1;
2900 znode = get_znode(c, znode, n);
2901 if (IS_ERR(znode))
2902 return znode;
2903 }
2904 break;
2905 }
2906 }
2907 return znode;
2908}
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918static struct ubifs_znode *right_znode(struct ubifs_info *c,
2919 struct ubifs_znode *znode)
2920{
2921 int level = znode->level;
2922
2923 while (1) {
2924 int n = znode->iip + 1;
2925
2926
2927 znode = znode->parent;
2928 if (!znode)
2929 return NULL;
2930 if (n < znode->child_cnt) {
2931
2932 znode = get_znode(c, znode, n);
2933 if (IS_ERR(znode))
2934 return znode;
2935 while (znode->level != level) {
2936 znode = get_znode(c, znode, 0);
2937 if (IS_ERR(znode))
2938 return znode;
2939 }
2940 break;
2941 }
2942 }
2943 return znode;
2944}
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971static struct ubifs_znode *lookup_znode(struct ubifs_info *c,
2972 union ubifs_key *key, int level,
2973 int lnum, int offs)
2974{
2975 struct ubifs_znode *znode, *zn;
2976 int n, nn;
2977
2978 ubifs_assert(key_type(c, key) < UBIFS_INVALID_KEY);
2979
2980
2981
2982
2983
2984 if (level < 0)
2985 return ERR_PTR(-EINVAL);
2986
2987
2988 znode = c->zroot.znode;
2989 if (!znode) {
2990 znode = ubifs_load_znode(c, &c->zroot, NULL, 0);
2991 if (IS_ERR(znode))
2992 return znode;
2993 }
2994
2995 if (c->zroot.lnum == lnum && c->zroot.offs == offs)
2996 return znode;
2997
2998 if (level >= znode->level)
2999 return NULL;
3000 while (1) {
3001 ubifs_search_zbranch(c, znode, key, &n);
3002 if (n < 0) {
3003
3004
3005
3006
3007
3008
3009
3010
3011 znode = left_znode(c, znode);
3012 if (!znode)
3013 return NULL;
3014 if (IS_ERR(znode))
3015 return znode;
3016 ubifs_search_zbranch(c, znode, key, &n);
3017 ubifs_assert(n >= 0);
3018 }
3019 if (znode->level == level + 1)
3020 break;
3021 znode = get_znode(c, znode, n);
3022 if (IS_ERR(znode))
3023 return znode;
3024 }
3025
3026 if (znode->zbranch[n].lnum == lnum && znode->zbranch[n].offs == offs)
3027 return get_znode(c, znode, n);
3028
3029 if (!is_hash_key(c, key))
3030 return NULL;
3031
3032
3033
3034
3035 zn = znode;
3036 nn = n;
3037
3038 while (1) {
3039
3040 if (n)
3041 n -= 1;
3042 else {
3043 znode = left_znode(c, znode);
3044 if (!znode)
3045 break;
3046 if (IS_ERR(znode))
3047 return znode;
3048 n = znode->child_cnt - 1;
3049 }
3050
3051 if (znode->zbranch[n].lnum == lnum &&
3052 znode->zbranch[n].offs == offs)
3053 return get_znode(c, znode, n);
3054
3055 if (keys_cmp(c, &znode->zbranch[n].key, key) < 0)
3056 break;
3057 }
3058
3059 znode = zn;
3060 n = nn;
3061
3062 while (1) {
3063
3064 if (++n >= znode->child_cnt) {
3065 znode = right_znode(c, znode);
3066 if (!znode)
3067 break;
3068 if (IS_ERR(znode))
3069 return znode;
3070 n = 0;
3071 }
3072
3073 if (znode->zbranch[n].lnum == lnum &&
3074 znode->zbranch[n].offs == offs)
3075 return get_znode(c, znode, n);
3076
3077 if (keys_cmp(c, &znode->zbranch[n].key, key) > 0)
3078 break;
3079 }
3080 return NULL;
3081}
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100int is_idx_node_in_tnc(struct ubifs_info *c, union ubifs_key *key, int level,
3101 int lnum, int offs)
3102{
3103 struct ubifs_znode *znode;
3104
3105 znode = lookup_znode(c, key, level, lnum, offs);
3106 if (!znode)
3107 return 0;
3108 if (IS_ERR(znode))
3109 return PTR_ERR(znode);
3110
3111 return ubifs_zn_dirty(znode) ? 1 : 2;
3112}
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127static int is_leaf_node_in_tnc(struct ubifs_info *c, union ubifs_key *key,
3128 int lnum, int offs)
3129{
3130 struct ubifs_zbranch *zbr;
3131 struct ubifs_znode *znode, *zn;
3132 int n, found, err, nn;
3133 const int unique = !is_hash_key(c, key);
3134
3135 found = ubifs_lookup_level0(c, key, &znode, &n);
3136 if (found < 0)
3137 return found;
3138 if (!found)
3139 return 0;
3140 zbr = &znode->zbranch[n];
3141 if (lnum == zbr->lnum && offs == zbr->offs)
3142 return 1;
3143 if (unique)
3144 return 0;
3145
3146
3147
3148
3149 zn = znode;
3150 nn = n;
3151
3152 while (1) {
3153 err = tnc_prev(c, &znode, &n);
3154 if (err == -ENOENT)
3155 break;
3156 if (err)
3157 return err;
3158 if (keys_cmp(c, key, &znode->zbranch[n].key))
3159 break;
3160 zbr = &znode->zbranch[n];
3161 if (lnum == zbr->lnum && offs == zbr->offs)
3162 return 1;
3163 }
3164
3165 znode = zn;
3166 n = nn;
3167 while (1) {
3168 err = tnc_next(c, &znode, &n);
3169 if (err) {
3170 if (err == -ENOENT)
3171 return 0;
3172 return err;
3173 }
3174 if (keys_cmp(c, key, &znode->zbranch[n].key))
3175 break;
3176 zbr = &znode->zbranch[n];
3177 if (lnum == zbr->lnum && offs == zbr->offs)
3178 return 1;
3179 }
3180 return 0;
3181}
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197int ubifs_tnc_has_node(struct ubifs_info *c, union ubifs_key *key, int level,
3198 int lnum, int offs, int is_idx)
3199{
3200 int err;
3201
3202 mutex_lock(&c->tnc_mutex);
3203 if (is_idx) {
3204 err = is_idx_node_in_tnc(c, key, level, lnum, offs);
3205 if (err < 0)
3206 goto out_unlock;
3207 if (err == 1)
3208
3209 err = 0;
3210 else if (err == 2)
3211
3212 err = 1;
3213 else
3214 BUG_ON(err != 0);
3215 } else
3216 err = is_leaf_node_in_tnc(c, key, lnum, offs);
3217
3218out_unlock:
3219 mutex_unlock(&c->tnc_mutex);
3220 return err;
3221}
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237int ubifs_dirty_idx_node(struct ubifs_info *c, union ubifs_key *key, int level,
3238 int lnum, int offs)
3239{
3240 struct ubifs_znode *znode;
3241 int err = 0;
3242
3243 mutex_lock(&c->tnc_mutex);
3244 znode = lookup_znode(c, key, level, lnum, offs);
3245 if (!znode)
3246 goto out_unlock;
3247 if (IS_ERR(znode)) {
3248 err = PTR_ERR(znode);
3249 goto out_unlock;
3250 }
3251 znode = dirty_cow_bottom_up(c, znode);
3252 if (IS_ERR(znode)) {
3253 err = PTR_ERR(znode);
3254 goto out_unlock;
3255 }
3256
3257out_unlock:
3258 mutex_unlock(&c->tnc_mutex);
3259 return err;
3260}
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273int dbg_check_inode_size(struct ubifs_info *c, const struct inode *inode,
3274 loff_t size)
3275{
3276 int err, n;
3277 union ubifs_key from_key, to_key, *key;
3278 struct ubifs_znode *znode;
3279 unsigned int block;
3280
3281 if (!S_ISREG(inode->i_mode))
3282 return 0;
3283 if (!dbg_is_chk_gen(c))
3284 return 0;
3285
3286 block = (size + UBIFS_BLOCK_SIZE - 1) >> UBIFS_BLOCK_SHIFT;
3287 data_key_init(c, &from_key, inode->i_ino, block);
3288 highest_data_key(c, &to_key, inode->i_ino);
3289
3290 mutex_lock(&c->tnc_mutex);
3291 err = ubifs_lookup_level0(c, &from_key, &znode, &n);
3292 if (err < 0)
3293 goto out_unlock;
3294
3295 if (err) {
3296 key = &from_key;
3297 goto out_dump;
3298 }
3299
3300 err = tnc_next(c, &znode, &n);
3301 if (err == -ENOENT) {
3302 err = 0;
3303 goto out_unlock;
3304 }
3305 if (err < 0)
3306 goto out_unlock;
3307
3308 ubifs_assert(err == 0);
3309 key = &znode->zbranch[n].key;
3310 if (!key_in_range(c, key, &from_key, &to_key))
3311 goto out_unlock;
3312
3313out_dump:
3314 block = key_block(c, key);
3315 ubifs_err(c, "inode %lu has size %lld, but there are data at offset %lld",
3316 (unsigned long)inode->i_ino, size,
3317 ((loff_t)block) << UBIFS_BLOCK_SHIFT);
3318 mutex_unlock(&c->tnc_mutex);
3319 ubifs_dump_inode(c, inode);
3320 dump_stack();
3321 return -EINVAL;
3322
3323out_unlock:
3324 mutex_unlock(&c->tnc_mutex);
3325 return err;
3326}
3327