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46#include "ubifs.h"
47#include <linux/crc16.h>
48#include <linux/math64.h>
49#include <linux/slab.h>
50
51
52
53
54
55
56
57
58static void do_calc_lpt_geom(struct ubifs_info *c)
59{
60 int i, n, bits, per_leb_wastage, max_pnode_cnt;
61 long long sz, tot_wastage;
62
63 n = c->main_lebs + c->max_leb_cnt - c->leb_cnt;
64 max_pnode_cnt = DIV_ROUND_UP(n, UBIFS_LPT_FANOUT);
65
66 c->lpt_hght = 1;
67 n = UBIFS_LPT_FANOUT;
68 while (n < max_pnode_cnt) {
69 c->lpt_hght += 1;
70 n <<= UBIFS_LPT_FANOUT_SHIFT;
71 }
72
73 c->pnode_cnt = DIV_ROUND_UP(c->main_lebs, UBIFS_LPT_FANOUT);
74
75 n = DIV_ROUND_UP(c->pnode_cnt, UBIFS_LPT_FANOUT);
76 c->nnode_cnt = n;
77 for (i = 1; i < c->lpt_hght; i++) {
78 n = DIV_ROUND_UP(n, UBIFS_LPT_FANOUT);
79 c->nnode_cnt += n;
80 }
81
82 c->space_bits = fls(c->leb_size) - 3;
83 c->lpt_lnum_bits = fls(c->lpt_lebs);
84 c->lpt_offs_bits = fls(c->leb_size - 1);
85 c->lpt_spc_bits = fls(c->leb_size);
86
87 n = DIV_ROUND_UP(c->max_leb_cnt, UBIFS_LPT_FANOUT);
88 c->pcnt_bits = fls(n - 1);
89
90 c->lnum_bits = fls(c->max_leb_cnt - 1);
91
92 bits = UBIFS_LPT_CRC_BITS + UBIFS_LPT_TYPE_BITS +
93 (c->big_lpt ? c->pcnt_bits : 0) +
94 (c->space_bits * 2 + 1) * UBIFS_LPT_FANOUT;
95 c->pnode_sz = (bits + 7) / 8;
96
97 bits = UBIFS_LPT_CRC_BITS + UBIFS_LPT_TYPE_BITS +
98 (c->big_lpt ? c->pcnt_bits : 0) +
99 (c->lpt_lnum_bits + c->lpt_offs_bits) * UBIFS_LPT_FANOUT;
100 c->nnode_sz = (bits + 7) / 8;
101
102 bits = UBIFS_LPT_CRC_BITS + UBIFS_LPT_TYPE_BITS +
103 c->lpt_lebs * c->lpt_spc_bits * 2;
104 c->ltab_sz = (bits + 7) / 8;
105
106 bits = UBIFS_LPT_CRC_BITS + UBIFS_LPT_TYPE_BITS +
107 c->lnum_bits * c->lsave_cnt;
108 c->lsave_sz = (bits + 7) / 8;
109
110
111 c->lpt_sz = (long long)c->pnode_cnt * c->pnode_sz;
112 c->lpt_sz += (long long)c->nnode_cnt * c->nnode_sz;
113 c->lpt_sz += c->ltab_sz;
114 if (c->big_lpt)
115 c->lpt_sz += c->lsave_sz;
116
117
118 sz = c->lpt_sz;
119 per_leb_wastage = max_t(int, c->pnode_sz, c->nnode_sz);
120 sz += per_leb_wastage;
121 tot_wastage = per_leb_wastage;
122 while (sz > c->leb_size) {
123 sz += per_leb_wastage;
124 sz -= c->leb_size;
125 tot_wastage += per_leb_wastage;
126 }
127 tot_wastage += ALIGN(sz, c->min_io_size) - sz;
128 c->lpt_sz += tot_wastage;
129}
130
131
132
133
134
135
136
137int ubifs_calc_lpt_geom(struct ubifs_info *c)
138{
139 int lebs_needed;
140 long long sz;
141
142 do_calc_lpt_geom(c);
143
144
145 sz = c->lpt_sz * 2;
146 lebs_needed = div_u64(sz + c->leb_size - 1, c->leb_size);
147 if (lebs_needed > c->lpt_lebs) {
148 ubifs_err(c, "too few LPT LEBs");
149 return -EINVAL;
150 }
151
152
153 if (c->ltab_sz > c->leb_size) {
154 ubifs_err(c, "LPT ltab too big");
155 return -EINVAL;
156 }
157
158 c->check_lpt_free = c->big_lpt;
159 return 0;
160}
161
162
163
164
165
166
167
168
169
170
171
172
173
174static int calc_dflt_lpt_geom(struct ubifs_info *c, int *main_lebs,
175 int *big_lpt)
176{
177 int i, lebs_needed;
178 long long sz;
179
180
181 c->lpt_lebs = UBIFS_MIN_LPT_LEBS;
182 c->main_lebs = *main_lebs - c->lpt_lebs;
183 if (c->main_lebs <= 0)
184 return -EINVAL;
185
186
187 c->big_lpt = 0;
188
189
190
191
192
193 do_calc_lpt_geom(c);
194
195
196 if (c->lpt_sz > c->leb_size) {
197
198 c->big_lpt = 1;
199 do_calc_lpt_geom(c);
200 }
201
202
203 for (i = 0; i < 64 ; i++) {
204 sz = c->lpt_sz * 4;
205 lebs_needed = div_u64(sz + c->leb_size - 1, c->leb_size);
206 if (lebs_needed > c->lpt_lebs) {
207
208 c->lpt_lebs = lebs_needed;
209 c->main_lebs = *main_lebs - c->lpt_lebs;
210 if (c->main_lebs <= 0)
211 return -EINVAL;
212 do_calc_lpt_geom(c);
213 continue;
214 }
215 if (c->ltab_sz > c->leb_size) {
216 ubifs_err(c, "LPT ltab too big");
217 return -EINVAL;
218 }
219 *main_lebs = c->main_lebs;
220 *big_lpt = c->big_lpt;
221 return 0;
222 }
223 return -EINVAL;
224}
225
226
227
228
229
230
231
232
233static void pack_bits(uint8_t **addr, int *pos, uint32_t val, int nrbits)
234{
235 uint8_t *p = *addr;
236 int b = *pos;
237
238 ubifs_assert(nrbits > 0);
239 ubifs_assert(nrbits <= 32);
240 ubifs_assert(*pos >= 0);
241 ubifs_assert(*pos < 8);
242 ubifs_assert((val >> nrbits) == 0 || nrbits == 32);
243 if (b) {
244 *p |= ((uint8_t)val) << b;
245 nrbits += b;
246 if (nrbits > 8) {
247 *++p = (uint8_t)(val >>= (8 - b));
248 if (nrbits > 16) {
249 *++p = (uint8_t)(val >>= 8);
250 if (nrbits > 24) {
251 *++p = (uint8_t)(val >>= 8);
252 if (nrbits > 32)
253 *++p = (uint8_t)(val >>= 8);
254 }
255 }
256 }
257 } else {
258 *p = (uint8_t)val;
259 if (nrbits > 8) {
260 *++p = (uint8_t)(val >>= 8);
261 if (nrbits > 16) {
262 *++p = (uint8_t)(val >>= 8);
263 if (nrbits > 24)
264 *++p = (uint8_t)(val >>= 8);
265 }
266 }
267 }
268 b = nrbits & 7;
269 if (b == 0)
270 p++;
271 *addr = p;
272 *pos = b;
273}
274
275
276
277
278
279
280
281
282
283uint32_t ubifs_unpack_bits(uint8_t **addr, int *pos, int nrbits)
284{
285 const int k = 32 - nrbits;
286 uint8_t *p = *addr;
287 int b = *pos;
288 uint32_t uninitialized_var(val);
289 const int bytes = (nrbits + b + 7) >> 3;
290
291 ubifs_assert(nrbits > 0);
292 ubifs_assert(nrbits <= 32);
293 ubifs_assert(*pos >= 0);
294 ubifs_assert(*pos < 8);
295 if (b) {
296 switch (bytes) {
297 case 2:
298 val = p[1];
299 break;
300 case 3:
301 val = p[1] | ((uint32_t)p[2] << 8);
302 break;
303 case 4:
304 val = p[1] | ((uint32_t)p[2] << 8) |
305 ((uint32_t)p[3] << 16);
306 break;
307 case 5:
308 val = p[1] | ((uint32_t)p[2] << 8) |
309 ((uint32_t)p[3] << 16) |
310 ((uint32_t)p[4] << 24);
311 }
312 val <<= (8 - b);
313 val |= *p >> b;
314 nrbits += b;
315 } else {
316 switch (bytes) {
317 case 1:
318 val = p[0];
319 break;
320 case 2:
321 val = p[0] | ((uint32_t)p[1] << 8);
322 break;
323 case 3:
324 val = p[0] | ((uint32_t)p[1] << 8) |
325 ((uint32_t)p[2] << 16);
326 break;
327 case 4:
328 val = p[0] | ((uint32_t)p[1] << 8) |
329 ((uint32_t)p[2] << 16) |
330 ((uint32_t)p[3] << 24);
331 break;
332 }
333 }
334 val <<= k;
335 val >>= k;
336 b = nrbits & 7;
337 p += nrbits >> 3;
338 *addr = p;
339 *pos = b;
340 ubifs_assert((val >> nrbits) == 0 || nrbits - b == 32);
341 return val;
342}
343
344
345
346
347
348
349
350void ubifs_pack_pnode(struct ubifs_info *c, void *buf,
351 struct ubifs_pnode *pnode)
352{
353 uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES;
354 int i, pos = 0;
355 uint16_t crc;
356
357 pack_bits(&addr, &pos, UBIFS_LPT_PNODE, UBIFS_LPT_TYPE_BITS);
358 if (c->big_lpt)
359 pack_bits(&addr, &pos, pnode->num, c->pcnt_bits);
360 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
361 pack_bits(&addr, &pos, pnode->lprops[i].free >> 3,
362 c->space_bits);
363 pack_bits(&addr, &pos, pnode->lprops[i].dirty >> 3,
364 c->space_bits);
365 if (pnode->lprops[i].flags & LPROPS_INDEX)
366 pack_bits(&addr, &pos, 1, 1);
367 else
368 pack_bits(&addr, &pos, 0, 1);
369 }
370 crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES,
371 c->pnode_sz - UBIFS_LPT_CRC_BYTES);
372 addr = buf;
373 pos = 0;
374 pack_bits(&addr, &pos, crc, UBIFS_LPT_CRC_BITS);
375}
376
377
378
379
380
381
382
383void ubifs_pack_nnode(struct ubifs_info *c, void *buf,
384 struct ubifs_nnode *nnode)
385{
386 uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES;
387 int i, pos = 0;
388 uint16_t crc;
389
390 pack_bits(&addr, &pos, UBIFS_LPT_NNODE, UBIFS_LPT_TYPE_BITS);
391 if (c->big_lpt)
392 pack_bits(&addr, &pos, nnode->num, c->pcnt_bits);
393 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
394 int lnum = nnode->nbranch[i].lnum;
395
396 if (lnum == 0)
397 lnum = c->lpt_last + 1;
398 pack_bits(&addr, &pos, lnum - c->lpt_first, c->lpt_lnum_bits);
399 pack_bits(&addr, &pos, nnode->nbranch[i].offs,
400 c->lpt_offs_bits);
401 }
402 crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES,
403 c->nnode_sz - UBIFS_LPT_CRC_BYTES);
404 addr = buf;
405 pos = 0;
406 pack_bits(&addr, &pos, crc, UBIFS_LPT_CRC_BITS);
407}
408
409
410
411
412
413
414
415void ubifs_pack_ltab(struct ubifs_info *c, void *buf,
416 struct ubifs_lpt_lprops *ltab)
417{
418 uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES;
419 int i, pos = 0;
420 uint16_t crc;
421
422 pack_bits(&addr, &pos, UBIFS_LPT_LTAB, UBIFS_LPT_TYPE_BITS);
423 for (i = 0; i < c->lpt_lebs; i++) {
424 pack_bits(&addr, &pos, ltab[i].free, c->lpt_spc_bits);
425 pack_bits(&addr, &pos, ltab[i].dirty, c->lpt_spc_bits);
426 }
427 crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES,
428 c->ltab_sz - UBIFS_LPT_CRC_BYTES);
429 addr = buf;
430 pos = 0;
431 pack_bits(&addr, &pos, crc, UBIFS_LPT_CRC_BITS);
432}
433
434
435
436
437
438
439
440void ubifs_pack_lsave(struct ubifs_info *c, void *buf, int *lsave)
441{
442 uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES;
443 int i, pos = 0;
444 uint16_t crc;
445
446 pack_bits(&addr, &pos, UBIFS_LPT_LSAVE, UBIFS_LPT_TYPE_BITS);
447 for (i = 0; i < c->lsave_cnt; i++)
448 pack_bits(&addr, &pos, lsave[i], c->lnum_bits);
449 crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES,
450 c->lsave_sz - UBIFS_LPT_CRC_BYTES);
451 addr = buf;
452 pos = 0;
453 pack_bits(&addr, &pos, crc, UBIFS_LPT_CRC_BITS);
454}
455
456
457
458
459
460
461
462void ubifs_add_lpt_dirt(struct ubifs_info *c, int lnum, int dirty)
463{
464 if (!dirty || !lnum)
465 return;
466 dbg_lp("LEB %d add %d to %d",
467 lnum, dirty, c->ltab[lnum - c->lpt_first].dirty);
468 ubifs_assert(lnum >= c->lpt_first && lnum <= c->lpt_last);
469 c->ltab[lnum - c->lpt_first].dirty += dirty;
470}
471
472
473
474
475
476
477
478
479static void set_ltab(struct ubifs_info *c, int lnum, int free, int dirty)
480{
481 dbg_lp("LEB %d free %d dirty %d to %d %d",
482 lnum, c->ltab[lnum - c->lpt_first].free,
483 c->ltab[lnum - c->lpt_first].dirty, free, dirty);
484 ubifs_assert(lnum >= c->lpt_first && lnum <= c->lpt_last);
485 c->ltab[lnum - c->lpt_first].free = free;
486 c->ltab[lnum - c->lpt_first].dirty = dirty;
487}
488
489
490
491
492
493
494void ubifs_add_nnode_dirt(struct ubifs_info *c, struct ubifs_nnode *nnode)
495{
496 struct ubifs_nnode *np = nnode->parent;
497
498 if (np)
499 ubifs_add_lpt_dirt(c, np->nbranch[nnode->iip].lnum,
500 c->nnode_sz);
501 else {
502 ubifs_add_lpt_dirt(c, c->lpt_lnum, c->nnode_sz);
503 if (!(c->lpt_drty_flgs & LTAB_DIRTY)) {
504 c->lpt_drty_flgs |= LTAB_DIRTY;
505 ubifs_add_lpt_dirt(c, c->ltab_lnum, c->ltab_sz);
506 }
507 }
508}
509
510
511
512
513
514
515static void add_pnode_dirt(struct ubifs_info *c, struct ubifs_pnode *pnode)
516{
517 ubifs_add_lpt_dirt(c, pnode->parent->nbranch[pnode->iip].lnum,
518 c->pnode_sz);
519}
520
521
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528
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530
531
532static int calc_nnode_num(int row, int col)
533{
534 int num, bits;
535
536 num = 1;
537 while (row--) {
538 bits = (col & (UBIFS_LPT_FANOUT - 1));
539 col >>= UBIFS_LPT_FANOUT_SHIFT;
540 num <<= UBIFS_LPT_FANOUT_SHIFT;
541 num |= bits;
542 }
543 return num;
544}
545
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556
557
558static int calc_nnode_num_from_parent(const struct ubifs_info *c,
559 struct ubifs_nnode *parent, int iip)
560{
561 int num, shft;
562
563 if (!parent)
564 return 1;
565 shft = (c->lpt_hght - parent->level) * UBIFS_LPT_FANOUT_SHIFT;
566 num = parent->num ^ (1 << shft);
567 num |= (UBIFS_LPT_FANOUT + iip) << shft;
568 return num;
569}
570
571
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574
575
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578
579
580
581
582
583static int calc_pnode_num_from_parent(const struct ubifs_info *c,
584 struct ubifs_nnode *parent, int iip)
585{
586 int i, n = c->lpt_hght - 1, pnum = parent->num, num = 0;
587
588 for (i = 0; i < n; i++) {
589 num <<= UBIFS_LPT_FANOUT_SHIFT;
590 num |= pnum & (UBIFS_LPT_FANOUT - 1);
591 pnum >>= UBIFS_LPT_FANOUT_SHIFT;
592 }
593 num <<= UBIFS_LPT_FANOUT_SHIFT;
594 num |= iip;
595 return num;
596}
597
598
599
600
601
602
603
604
605
606
607
608int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first,
609 int *lpt_lebs, int *big_lpt)
610{
611 int lnum, err = 0, node_sz, iopos, i, j, cnt, len, alen, row;
612 int blnum, boffs, bsz, bcnt;
613 struct ubifs_pnode *pnode = NULL;
614 struct ubifs_nnode *nnode = NULL;
615 void *buf = NULL, *p;
616 struct ubifs_lpt_lprops *ltab = NULL;
617 int *lsave = NULL;
618
619 err = calc_dflt_lpt_geom(c, main_lebs, big_lpt);
620 if (err)
621 return err;
622 *lpt_lebs = c->lpt_lebs;
623
624
625 c->lpt_first = lpt_first;
626
627 c->lpt_last = lpt_first + c->lpt_lebs - 1;
628
629 c->main_first = c->leb_cnt - *main_lebs;
630
631 lsave = kmalloc(sizeof(int) * c->lsave_cnt, GFP_KERNEL);
632 pnode = kzalloc(sizeof(struct ubifs_pnode), GFP_KERNEL);
633 nnode = kzalloc(sizeof(struct ubifs_nnode), GFP_KERNEL);
634 buf = vmalloc(c->leb_size);
635 ltab = vmalloc(sizeof(struct ubifs_lpt_lprops) * c->lpt_lebs);
636 if (!pnode || !nnode || !buf || !ltab || !lsave) {
637 err = -ENOMEM;
638 goto out;
639 }
640
641 ubifs_assert(!c->ltab);
642 c->ltab = ltab;
643
644
645 for (i = 0; i < c->lpt_lebs; i++) {
646 ltab[i].free = c->leb_size;
647 ltab[i].dirty = 0;
648 ltab[i].tgc = 0;
649 ltab[i].cmt = 0;
650 }
651
652 lnum = lpt_first;
653 p = buf;
654
655 cnt = c->pnode_cnt;
656
657
658
659
660
661 node_sz = ALIGN(ubifs_idx_node_sz(c, 1), 8);
662 iopos = ALIGN(node_sz, c->min_io_size);
663 pnode->lprops[0].free = c->leb_size - iopos;
664 pnode->lprops[0].dirty = iopos - node_sz;
665 pnode->lprops[0].flags = LPROPS_INDEX;
666
667 node_sz = UBIFS_INO_NODE_SZ;
668 iopos = ALIGN(node_sz, c->min_io_size);
669 pnode->lprops[1].free = c->leb_size - iopos;
670 pnode->lprops[1].dirty = iopos - node_sz;
671
672 for (i = 2; i < UBIFS_LPT_FANOUT; i++)
673 pnode->lprops[i].free = c->leb_size;
674
675
676 ubifs_pack_pnode(c, p, pnode);
677 p += c->pnode_sz;
678 len = c->pnode_sz;
679 pnode->num += 1;
680
681
682 pnode->lprops[0].free = c->leb_size;
683 pnode->lprops[0].dirty = 0;
684 pnode->lprops[0].flags = 0;
685
686 pnode->lprops[1].free = c->leb_size;
687 pnode->lprops[1].dirty = 0;
688
689
690
691
692
693 blnum = lnum;
694 boffs = 0;
695 bcnt = cnt;
696 bsz = c->pnode_sz;
697
698
699 for (i = 1; i < cnt; i++) {
700 if (len + c->pnode_sz > c->leb_size) {
701 alen = ALIGN(len, c->min_io_size);
702 set_ltab(c, lnum, c->leb_size - alen, alen - len);
703 memset(p, 0xff, alen - len);
704 err = ubifs_leb_change(c, lnum++, buf, alen);
705 if (err)
706 goto out;
707 p = buf;
708 len = 0;
709 }
710 ubifs_pack_pnode(c, p, pnode);
711 p += c->pnode_sz;
712 len += c->pnode_sz;
713
714
715
716
717
718 pnode->num += 1;
719 }
720
721 row = 0;
722 for (i = UBIFS_LPT_FANOUT; cnt > i; i <<= UBIFS_LPT_FANOUT_SHIFT)
723 row += 1;
724
725 while (1) {
726
727 cnt = DIV_ROUND_UP(cnt, UBIFS_LPT_FANOUT);
728 for (i = 0; i < cnt; i++) {
729 if (len + c->nnode_sz > c->leb_size) {
730 alen = ALIGN(len, c->min_io_size);
731 set_ltab(c, lnum, c->leb_size - alen,
732 alen - len);
733 memset(p, 0xff, alen - len);
734 err = ubifs_leb_change(c, lnum++, buf, alen);
735 if (err)
736 goto out;
737 p = buf;
738 len = 0;
739 }
740
741 if (cnt == 1) {
742 c->lpt_lnum = lnum;
743 c->lpt_offs = len;
744 }
745
746 for (j = 0; j < UBIFS_LPT_FANOUT; j++) {
747 if (bcnt) {
748 if (boffs + bsz > c->leb_size) {
749 blnum += 1;
750 boffs = 0;
751 }
752 nnode->nbranch[j].lnum = blnum;
753 nnode->nbranch[j].offs = boffs;
754 boffs += bsz;
755 bcnt--;
756 } else {
757 nnode->nbranch[j].lnum = 0;
758 nnode->nbranch[j].offs = 0;
759 }
760 }
761 nnode->num = calc_nnode_num(row, i);
762 ubifs_pack_nnode(c, p, nnode);
763 p += c->nnode_sz;
764 len += c->nnode_sz;
765 }
766
767 if (cnt == 1)
768 break;
769
770 bcnt = cnt;
771 bsz = c->nnode_sz;
772 row -= 1;
773 }
774
775 if (*big_lpt) {
776
777 if (len + c->lsave_sz > c->leb_size) {
778 alen = ALIGN(len, c->min_io_size);
779 set_ltab(c, lnum, c->leb_size - alen, alen - len);
780 memset(p, 0xff, alen - len);
781 err = ubifs_leb_change(c, lnum++, buf, alen);
782 if (err)
783 goto out;
784 p = buf;
785 len = 0;
786 }
787
788 c->lsave_lnum = lnum;
789 c->lsave_offs = len;
790
791 for (i = 0; i < c->lsave_cnt && i < *main_lebs; i++)
792 lsave[i] = c->main_first + i;
793 for (; i < c->lsave_cnt; i++)
794 lsave[i] = c->main_first;
795
796 ubifs_pack_lsave(c, p, lsave);
797 p += c->lsave_sz;
798 len += c->lsave_sz;
799 }
800
801
802 if (len + c->ltab_sz > c->leb_size) {
803 alen = ALIGN(len, c->min_io_size);
804 set_ltab(c, lnum, c->leb_size - alen, alen - len);
805 memset(p, 0xff, alen - len);
806 err = ubifs_leb_change(c, lnum++, buf, alen);
807 if (err)
808 goto out;
809 p = buf;
810 len = 0;
811 }
812
813 c->ltab_lnum = lnum;
814 c->ltab_offs = len;
815
816
817 len += c->ltab_sz;
818 alen = ALIGN(len, c->min_io_size);
819 set_ltab(c, lnum, c->leb_size - alen, alen - len);
820
821 ubifs_pack_ltab(c, p, ltab);
822 p += c->ltab_sz;
823
824
825 memset(p, 0xff, alen - len);
826 err = ubifs_leb_change(c, lnum, buf, alen);
827 if (err)
828 goto out;
829
830 c->nhead_lnum = lnum;
831 c->nhead_offs = ALIGN(len, c->min_io_size);
832
833 dbg_lp("space_bits %d", c->space_bits);
834 dbg_lp("lpt_lnum_bits %d", c->lpt_lnum_bits);
835 dbg_lp("lpt_offs_bits %d", c->lpt_offs_bits);
836 dbg_lp("lpt_spc_bits %d", c->lpt_spc_bits);
837 dbg_lp("pcnt_bits %d", c->pcnt_bits);
838 dbg_lp("lnum_bits %d", c->lnum_bits);
839 dbg_lp("pnode_sz %d", c->pnode_sz);
840 dbg_lp("nnode_sz %d", c->nnode_sz);
841 dbg_lp("ltab_sz %d", c->ltab_sz);
842 dbg_lp("lsave_sz %d", c->lsave_sz);
843 dbg_lp("lsave_cnt %d", c->lsave_cnt);
844 dbg_lp("lpt_hght %d", c->lpt_hght);
845 dbg_lp("big_lpt %d", c->big_lpt);
846 dbg_lp("LPT root is at %d:%d", c->lpt_lnum, c->lpt_offs);
847 dbg_lp("LPT head is at %d:%d", c->nhead_lnum, c->nhead_offs);
848 dbg_lp("LPT ltab is at %d:%d", c->ltab_lnum, c->ltab_offs);
849 if (c->big_lpt)
850 dbg_lp("LPT lsave is at %d:%d", c->lsave_lnum, c->lsave_offs);
851out:
852 c->ltab = NULL;
853 kfree(lsave);
854 vfree(ltab);
855 vfree(buf);
856 kfree(nnode);
857 kfree(pnode);
858 return err;
859}
860
861
862
863
864
865
866
867
868
869static void update_cats(struct ubifs_info *c, struct ubifs_pnode *pnode)
870{
871 int i;
872
873 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
874 int cat = pnode->lprops[i].flags & LPROPS_CAT_MASK;
875 int lnum = pnode->lprops[i].lnum;
876
877 if (!lnum)
878 return;
879 ubifs_add_to_cat(c, &pnode->lprops[i], cat);
880 }
881}
882
883
884
885
886
887
888
889
890
891
892
893static void replace_cats(struct ubifs_info *c, struct ubifs_pnode *old_pnode,
894 struct ubifs_pnode *new_pnode)
895{
896 int i;
897
898 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
899 if (!new_pnode->lprops[i].lnum)
900 return;
901 ubifs_replace_cat(c, &old_pnode->lprops[i],
902 &new_pnode->lprops[i]);
903 }
904}
905
906
907
908
909
910
911
912
913
914static int check_lpt_crc(const struct ubifs_info *c, void *buf, int len)
915{
916 int pos = 0;
917 uint8_t *addr = buf;
918 uint16_t crc, calc_crc;
919
920 crc = ubifs_unpack_bits(&addr, &pos, UBIFS_LPT_CRC_BITS);
921 calc_crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES,
922 len - UBIFS_LPT_CRC_BYTES);
923 if (crc != calc_crc) {
924 ubifs_err(c, "invalid crc in LPT node: crc %hx calc %hx",
925 crc, calc_crc);
926 dump_stack();
927 return -EINVAL;
928 }
929 return 0;
930}
931
932
933
934
935
936
937
938
939
940
941static int check_lpt_type(const struct ubifs_info *c, uint8_t **addr,
942 int *pos, int type)
943{
944 int node_type;
945
946 node_type = ubifs_unpack_bits(addr, pos, UBIFS_LPT_TYPE_BITS);
947 if (node_type != type) {
948 ubifs_err(c, "invalid type (%d) in LPT node type %d",
949 node_type, type);
950 dump_stack();
951 return -EINVAL;
952 }
953 return 0;
954}
955
956
957
958
959
960
961
962
963
964static int unpack_pnode(const struct ubifs_info *c, void *buf,
965 struct ubifs_pnode *pnode)
966{
967 uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES;
968 int i, pos = 0, err;
969
970 err = check_lpt_type(c, &addr, &pos, UBIFS_LPT_PNODE);
971 if (err)
972 return err;
973 if (c->big_lpt)
974 pnode->num = ubifs_unpack_bits(&addr, &pos, c->pcnt_bits);
975 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
976 struct ubifs_lprops * const lprops = &pnode->lprops[i];
977
978 lprops->free = ubifs_unpack_bits(&addr, &pos, c->space_bits);
979 lprops->free <<= 3;
980 lprops->dirty = ubifs_unpack_bits(&addr, &pos, c->space_bits);
981 lprops->dirty <<= 3;
982
983 if (ubifs_unpack_bits(&addr, &pos, 1))
984 lprops->flags = LPROPS_INDEX;
985 else
986 lprops->flags = 0;
987 lprops->flags |= ubifs_categorize_lprops(c, lprops);
988 }
989 err = check_lpt_crc(c, buf, c->pnode_sz);
990 return err;
991}
992
993
994
995
996
997
998
999
1000
1001int ubifs_unpack_nnode(const struct ubifs_info *c, void *buf,
1002 struct ubifs_nnode *nnode)
1003{
1004 uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES;
1005 int i, pos = 0, err;
1006
1007 err = check_lpt_type(c, &addr, &pos, UBIFS_LPT_NNODE);
1008 if (err)
1009 return err;
1010 if (c->big_lpt)
1011 nnode->num = ubifs_unpack_bits(&addr, &pos, c->pcnt_bits);
1012 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
1013 int lnum;
1014
1015 lnum = ubifs_unpack_bits(&addr, &pos, c->lpt_lnum_bits) +
1016 c->lpt_first;
1017 if (lnum == c->lpt_last + 1)
1018 lnum = 0;
1019 nnode->nbranch[i].lnum = lnum;
1020 nnode->nbranch[i].offs = ubifs_unpack_bits(&addr, &pos,
1021 c->lpt_offs_bits);
1022 }
1023 err = check_lpt_crc(c, buf, c->nnode_sz);
1024 return err;
1025}
1026
1027
1028
1029
1030
1031
1032
1033
1034static int unpack_ltab(const struct ubifs_info *c, void *buf)
1035{
1036 uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES;
1037 int i, pos = 0, err;
1038
1039 err = check_lpt_type(c, &addr, &pos, UBIFS_LPT_LTAB);
1040 if (err)
1041 return err;
1042 for (i = 0; i < c->lpt_lebs; i++) {
1043 int free = ubifs_unpack_bits(&addr, &pos, c->lpt_spc_bits);
1044 int dirty = ubifs_unpack_bits(&addr, &pos, c->lpt_spc_bits);
1045
1046 if (free < 0 || free > c->leb_size || dirty < 0 ||
1047 dirty > c->leb_size || free + dirty > c->leb_size)
1048 return -EINVAL;
1049
1050 c->ltab[i].free = free;
1051 c->ltab[i].dirty = dirty;
1052 c->ltab[i].tgc = 0;
1053 c->ltab[i].cmt = 0;
1054 }
1055 err = check_lpt_crc(c, buf, c->ltab_sz);
1056 return err;
1057}
1058
1059
1060
1061
1062
1063
1064
1065
1066static int unpack_lsave(const struct ubifs_info *c, void *buf)
1067{
1068 uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES;
1069 int i, pos = 0, err;
1070
1071 err = check_lpt_type(c, &addr, &pos, UBIFS_LPT_LSAVE);
1072 if (err)
1073 return err;
1074 for (i = 0; i < c->lsave_cnt; i++) {
1075 int lnum = ubifs_unpack_bits(&addr, &pos, c->lnum_bits);
1076
1077 if (lnum < c->main_first || lnum >= c->leb_cnt)
1078 return -EINVAL;
1079 c->lsave[i] = lnum;
1080 }
1081 err = check_lpt_crc(c, buf, c->lsave_sz);
1082 return err;
1083}
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094static int validate_nnode(const struct ubifs_info *c, struct ubifs_nnode *nnode,
1095 struct ubifs_nnode *parent, int iip)
1096{
1097 int i, lvl, max_offs;
1098
1099 if (c->big_lpt) {
1100 int num = calc_nnode_num_from_parent(c, parent, iip);
1101
1102 if (nnode->num != num)
1103 return -EINVAL;
1104 }
1105 lvl = parent ? parent->level - 1 : c->lpt_hght;
1106 if (lvl < 1)
1107 return -EINVAL;
1108 if (lvl == 1)
1109 max_offs = c->leb_size - c->pnode_sz;
1110 else
1111 max_offs = c->leb_size - c->nnode_sz;
1112 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
1113 int lnum = nnode->nbranch[i].lnum;
1114 int offs = nnode->nbranch[i].offs;
1115
1116 if (lnum == 0) {
1117 if (offs != 0)
1118 return -EINVAL;
1119 continue;
1120 }
1121 if (lnum < c->lpt_first || lnum > c->lpt_last)
1122 return -EINVAL;
1123 if (offs < 0 || offs > max_offs)
1124 return -EINVAL;
1125 }
1126 return 0;
1127}
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138static int validate_pnode(const struct ubifs_info *c, struct ubifs_pnode *pnode,
1139 struct ubifs_nnode *parent, int iip)
1140{
1141 int i;
1142
1143 if (c->big_lpt) {
1144 int num = calc_pnode_num_from_parent(c, parent, iip);
1145
1146 if (pnode->num != num)
1147 return -EINVAL;
1148 }
1149 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
1150 int free = pnode->lprops[i].free;
1151 int dirty = pnode->lprops[i].dirty;
1152
1153 if (free < 0 || free > c->leb_size || free % c->min_io_size ||
1154 (free & 7))
1155 return -EINVAL;
1156 if (dirty < 0 || dirty > c->leb_size || (dirty & 7))
1157 return -EINVAL;
1158 if (dirty + free > c->leb_size)
1159 return -EINVAL;
1160 }
1161 return 0;
1162}
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172static void set_pnode_lnum(const struct ubifs_info *c,
1173 struct ubifs_pnode *pnode)
1174{
1175 int i, lnum;
1176
1177 lnum = (pnode->num << UBIFS_LPT_FANOUT_SHIFT) + c->main_first;
1178 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
1179 if (lnum >= c->leb_cnt)
1180 return;
1181 pnode->lprops[i].lnum = lnum++;
1182 }
1183}
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193int ubifs_read_nnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip)
1194{
1195 struct ubifs_nbranch *branch = NULL;
1196 struct ubifs_nnode *nnode = NULL;
1197 void *buf = c->lpt_nod_buf;
1198 int err, lnum, offs;
1199
1200 if (parent) {
1201 branch = &parent->nbranch[iip];
1202 lnum = branch->lnum;
1203 offs = branch->offs;
1204 } else {
1205 lnum = c->lpt_lnum;
1206 offs = c->lpt_offs;
1207 }
1208 nnode = kzalloc(sizeof(struct ubifs_nnode), GFP_NOFS);
1209 if (!nnode) {
1210 err = -ENOMEM;
1211 goto out;
1212 }
1213 if (lnum == 0) {
1214
1215
1216
1217
1218
1219
1220 if (c->big_lpt)
1221 nnode->num = calc_nnode_num_from_parent(c, parent, iip);
1222 } else {
1223 err = ubifs_leb_read(c, lnum, buf, offs, c->nnode_sz, 1);
1224 if (err)
1225 goto out;
1226 err = ubifs_unpack_nnode(c, buf, nnode);
1227 if (err)
1228 goto out;
1229 }
1230 err = validate_nnode(c, nnode, parent, iip);
1231 if (err)
1232 goto out;
1233 if (!c->big_lpt)
1234 nnode->num = calc_nnode_num_from_parent(c, parent, iip);
1235 if (parent) {
1236 branch->nnode = nnode;
1237 nnode->level = parent->level - 1;
1238 } else {
1239 c->nroot = nnode;
1240 nnode->level = c->lpt_hght;
1241 }
1242 nnode->parent = parent;
1243 nnode->iip = iip;
1244 return 0;
1245
1246out:
1247 ubifs_err(c, "error %d reading nnode at %d:%d", err, lnum, offs);
1248 dump_stack();
1249 kfree(nnode);
1250 return err;
1251}
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261static int read_pnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip)
1262{
1263 struct ubifs_nbranch *branch;
1264 struct ubifs_pnode *pnode = NULL;
1265 void *buf = c->lpt_nod_buf;
1266 int err, lnum, offs;
1267
1268 branch = &parent->nbranch[iip];
1269 lnum = branch->lnum;
1270 offs = branch->offs;
1271 pnode = kzalloc(sizeof(struct ubifs_pnode), GFP_NOFS);
1272 if (!pnode)
1273 return -ENOMEM;
1274
1275 if (lnum == 0) {
1276
1277
1278
1279
1280
1281 int i;
1282
1283 if (c->big_lpt)
1284 pnode->num = calc_pnode_num_from_parent(c, parent, iip);
1285 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
1286 struct ubifs_lprops * const lprops = &pnode->lprops[i];
1287
1288 lprops->free = c->leb_size;
1289 lprops->flags = ubifs_categorize_lprops(c, lprops);
1290 }
1291 } else {
1292 err = ubifs_leb_read(c, lnum, buf, offs, c->pnode_sz, 1);
1293 if (err)
1294 goto out;
1295 err = unpack_pnode(c, buf, pnode);
1296 if (err)
1297 goto out;
1298 }
1299 err = validate_pnode(c, pnode, parent, iip);
1300 if (err)
1301 goto out;
1302 if (!c->big_lpt)
1303 pnode->num = calc_pnode_num_from_parent(c, parent, iip);
1304 branch->pnode = pnode;
1305 pnode->parent = parent;
1306 pnode->iip = iip;
1307 set_pnode_lnum(c, pnode);
1308 c->pnodes_have += 1;
1309 return 0;
1310
1311out:
1312 ubifs_err(c, "error %d reading pnode at %d:%d", err, lnum, offs);
1313 ubifs_dump_pnode(c, pnode, parent, iip);
1314 dump_stack();
1315 ubifs_err(c, "calc num: %d", calc_pnode_num_from_parent(c, parent, iip));
1316 kfree(pnode);
1317 return err;
1318}
1319
1320
1321
1322
1323
1324
1325
1326static int read_ltab(struct ubifs_info *c)
1327{
1328 int err;
1329 void *buf;
1330
1331 buf = vmalloc(c->ltab_sz);
1332 if (!buf)
1333 return -ENOMEM;
1334 err = ubifs_leb_read(c, c->ltab_lnum, buf, c->ltab_offs, c->ltab_sz, 1);
1335 if (err)
1336 goto out;
1337 err = unpack_ltab(c, buf);
1338out:
1339 vfree(buf);
1340 return err;
1341}
1342
1343
1344
1345
1346
1347
1348
1349static int read_lsave(struct ubifs_info *c)
1350{
1351 int err, i;
1352 void *buf;
1353
1354 buf = vmalloc(c->lsave_sz);
1355 if (!buf)
1356 return -ENOMEM;
1357 err = ubifs_leb_read(c, c->lsave_lnum, buf, c->lsave_offs,
1358 c->lsave_sz, 1);
1359 if (err)
1360 goto out;
1361 err = unpack_lsave(c, buf);
1362 if (err)
1363 goto out;
1364 for (i = 0; i < c->lsave_cnt; i++) {
1365 int lnum = c->lsave[i];
1366 struct ubifs_lprops *lprops;
1367
1368
1369
1370
1371
1372 if (lnum >= c->leb_cnt)
1373 continue;
1374 lprops = ubifs_lpt_lookup(c, lnum);
1375 if (IS_ERR(lprops)) {
1376 err = PTR_ERR(lprops);
1377 goto out;
1378 }
1379 }
1380out:
1381 vfree(buf);
1382 return err;
1383}
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394struct ubifs_nnode *ubifs_get_nnode(struct ubifs_info *c,
1395 struct ubifs_nnode *parent, int iip)
1396{
1397 struct ubifs_nbranch *branch;
1398 struct ubifs_nnode *nnode;
1399 int err;
1400
1401 branch = &parent->nbranch[iip];
1402 nnode = branch->nnode;
1403 if (nnode)
1404 return nnode;
1405 err = ubifs_read_nnode(c, parent, iip);
1406 if (err)
1407 return ERR_PTR(err);
1408 return branch->nnode;
1409}
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420struct ubifs_pnode *ubifs_get_pnode(struct ubifs_info *c,
1421 struct ubifs_nnode *parent, int iip)
1422{
1423 struct ubifs_nbranch *branch;
1424 struct ubifs_pnode *pnode;
1425 int err;
1426
1427 branch = &parent->nbranch[iip];
1428 pnode = branch->pnode;
1429 if (pnode)
1430 return pnode;
1431 err = read_pnode(c, parent, iip);
1432 if (err)
1433 return ERR_PTR(err);
1434 update_cats(c, branch->pnode);
1435 return branch->pnode;
1436}
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum)
1447{
1448 int err, i, h, iip, shft;
1449 struct ubifs_nnode *nnode;
1450 struct ubifs_pnode *pnode;
1451
1452 if (!c->nroot) {
1453 err = ubifs_read_nnode(c, NULL, 0);
1454 if (err)
1455 return ERR_PTR(err);
1456 }
1457 nnode = c->nroot;
1458 i = lnum - c->main_first;
1459 shft = c->lpt_hght * UBIFS_LPT_FANOUT_SHIFT;
1460 for (h = 1; h < c->lpt_hght; h++) {
1461 iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
1462 shft -= UBIFS_LPT_FANOUT_SHIFT;
1463 nnode = ubifs_get_nnode(c, nnode, iip);
1464 if (IS_ERR(nnode))
1465 return ERR_CAST(nnode);
1466 }
1467 iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
1468 pnode = ubifs_get_pnode(c, nnode, iip);
1469 if (IS_ERR(pnode))
1470 return ERR_CAST(pnode);
1471 iip = (i & (UBIFS_LPT_FANOUT - 1));
1472 dbg_lp("LEB %d, free %d, dirty %d, flags %d", lnum,
1473 pnode->lprops[iip].free, pnode->lprops[iip].dirty,
1474 pnode->lprops[iip].flags);
1475 return &pnode->lprops[iip];
1476}
1477
1478
1479
1480
1481
1482
1483
1484
1485static struct ubifs_nnode *dirty_cow_nnode(struct ubifs_info *c,
1486 struct ubifs_nnode *nnode)
1487{
1488 struct ubifs_nnode *n;
1489 int i;
1490
1491 if (!test_bit(COW_CNODE, &nnode->flags)) {
1492
1493 if (!test_and_set_bit(DIRTY_CNODE, &nnode->flags)) {
1494 c->dirty_nn_cnt += 1;
1495 ubifs_add_nnode_dirt(c, nnode);
1496 }
1497 return nnode;
1498 }
1499
1500
1501 n = kmemdup(nnode, sizeof(struct ubifs_nnode), GFP_NOFS);
1502 if (unlikely(!n))
1503 return ERR_PTR(-ENOMEM);
1504
1505 n->cnext = NULL;
1506 __set_bit(DIRTY_CNODE, &n->flags);
1507 __clear_bit(COW_CNODE, &n->flags);
1508
1509
1510 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
1511 struct ubifs_nbranch *branch = &n->nbranch[i];
1512
1513 if (branch->cnode)
1514 branch->cnode->parent = n;
1515 }
1516
1517 ubifs_assert(!test_bit(OBSOLETE_CNODE, &nnode->flags));
1518 __set_bit(OBSOLETE_CNODE, &nnode->flags);
1519
1520 c->dirty_nn_cnt += 1;
1521 ubifs_add_nnode_dirt(c, nnode);
1522 if (nnode->parent)
1523 nnode->parent->nbranch[n->iip].nnode = n;
1524 else
1525 c->nroot = n;
1526 return n;
1527}
1528
1529
1530
1531
1532
1533
1534
1535
1536static struct ubifs_pnode *dirty_cow_pnode(struct ubifs_info *c,
1537 struct ubifs_pnode *pnode)
1538{
1539 struct ubifs_pnode *p;
1540
1541 if (!test_bit(COW_CNODE, &pnode->flags)) {
1542
1543 if (!test_and_set_bit(DIRTY_CNODE, &pnode->flags)) {
1544 c->dirty_pn_cnt += 1;
1545 add_pnode_dirt(c, pnode);
1546 }
1547 return pnode;
1548 }
1549
1550
1551 p = kmemdup(pnode, sizeof(struct ubifs_pnode), GFP_NOFS);
1552 if (unlikely(!p))
1553 return ERR_PTR(-ENOMEM);
1554
1555 p->cnext = NULL;
1556 __set_bit(DIRTY_CNODE, &p->flags);
1557 __clear_bit(COW_CNODE, &p->flags);
1558 replace_cats(c, pnode, p);
1559
1560 ubifs_assert(!test_bit(OBSOLETE_CNODE, &pnode->flags));
1561 __set_bit(OBSOLETE_CNODE, &pnode->flags);
1562
1563 c->dirty_pn_cnt += 1;
1564 add_pnode_dirt(c, pnode);
1565 pnode->parent->nbranch[p->iip].pnode = p;
1566 return p;
1567}
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577struct ubifs_lprops *ubifs_lpt_lookup_dirty(struct ubifs_info *c, int lnum)
1578{
1579 int err, i, h, iip, shft;
1580 struct ubifs_nnode *nnode;
1581 struct ubifs_pnode *pnode;
1582
1583 if (!c->nroot) {
1584 err = ubifs_read_nnode(c, NULL, 0);
1585 if (err)
1586 return ERR_PTR(err);
1587 }
1588 nnode = c->nroot;
1589 nnode = dirty_cow_nnode(c, nnode);
1590 if (IS_ERR(nnode))
1591 return ERR_CAST(nnode);
1592 i = lnum - c->main_first;
1593 shft = c->lpt_hght * UBIFS_LPT_FANOUT_SHIFT;
1594 for (h = 1; h < c->lpt_hght; h++) {
1595 iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
1596 shft -= UBIFS_LPT_FANOUT_SHIFT;
1597 nnode = ubifs_get_nnode(c, nnode, iip);
1598 if (IS_ERR(nnode))
1599 return ERR_CAST(nnode);
1600 nnode = dirty_cow_nnode(c, nnode);
1601 if (IS_ERR(nnode))
1602 return ERR_CAST(nnode);
1603 }
1604 iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
1605 pnode = ubifs_get_pnode(c, nnode, iip);
1606 if (IS_ERR(pnode))
1607 return ERR_CAST(pnode);
1608 pnode = dirty_cow_pnode(c, pnode);
1609 if (IS_ERR(pnode))
1610 return ERR_CAST(pnode);
1611 iip = (i & (UBIFS_LPT_FANOUT - 1));
1612 dbg_lp("LEB %d, free %d, dirty %d, flags %d", lnum,
1613 pnode->lprops[iip].free, pnode->lprops[iip].dirty,
1614 pnode->lprops[iip].flags);
1615 ubifs_assert(test_bit(DIRTY_CNODE, &pnode->flags));
1616 return &pnode->lprops[iip];
1617}
1618
1619
1620
1621
1622
1623
1624
1625static int lpt_init_rd(struct ubifs_info *c)
1626{
1627 int err, i;
1628
1629 c->ltab = vmalloc(sizeof(struct ubifs_lpt_lprops) * c->lpt_lebs);
1630 if (!c->ltab)
1631 return -ENOMEM;
1632
1633 i = max_t(int, c->nnode_sz, c->pnode_sz);
1634 c->lpt_nod_buf = kmalloc(i, GFP_KERNEL);
1635 if (!c->lpt_nod_buf)
1636 return -ENOMEM;
1637
1638 for (i = 0; i < LPROPS_HEAP_CNT; i++) {
1639 c->lpt_heap[i].arr = kmalloc(sizeof(void *) * LPT_HEAP_SZ,
1640 GFP_KERNEL);
1641 if (!c->lpt_heap[i].arr)
1642 return -ENOMEM;
1643 c->lpt_heap[i].cnt = 0;
1644 c->lpt_heap[i].max_cnt = LPT_HEAP_SZ;
1645 }
1646
1647 c->dirty_idx.arr = kmalloc(sizeof(void *) * LPT_HEAP_SZ, GFP_KERNEL);
1648 if (!c->dirty_idx.arr)
1649 return -ENOMEM;
1650 c->dirty_idx.cnt = 0;
1651 c->dirty_idx.max_cnt = LPT_HEAP_SZ;
1652
1653 err = read_ltab(c);
1654 if (err)
1655 return err;
1656
1657 dbg_lp("space_bits %d", c->space_bits);
1658 dbg_lp("lpt_lnum_bits %d", c->lpt_lnum_bits);
1659 dbg_lp("lpt_offs_bits %d", c->lpt_offs_bits);
1660 dbg_lp("lpt_spc_bits %d", c->lpt_spc_bits);
1661 dbg_lp("pcnt_bits %d", c->pcnt_bits);
1662 dbg_lp("lnum_bits %d", c->lnum_bits);
1663 dbg_lp("pnode_sz %d", c->pnode_sz);
1664 dbg_lp("nnode_sz %d", c->nnode_sz);
1665 dbg_lp("ltab_sz %d", c->ltab_sz);
1666 dbg_lp("lsave_sz %d", c->lsave_sz);
1667 dbg_lp("lsave_cnt %d", c->lsave_cnt);
1668 dbg_lp("lpt_hght %d", c->lpt_hght);
1669 dbg_lp("big_lpt %d", c->big_lpt);
1670 dbg_lp("LPT root is at %d:%d", c->lpt_lnum, c->lpt_offs);
1671 dbg_lp("LPT head is at %d:%d", c->nhead_lnum, c->nhead_offs);
1672 dbg_lp("LPT ltab is at %d:%d", c->ltab_lnum, c->ltab_offs);
1673 if (c->big_lpt)
1674 dbg_lp("LPT lsave is at %d:%d", c->lsave_lnum, c->lsave_offs);
1675
1676 return 0;
1677}
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687static int lpt_init_wr(struct ubifs_info *c)
1688{
1689 int err, i;
1690
1691 c->ltab_cmt = vmalloc(sizeof(struct ubifs_lpt_lprops) * c->lpt_lebs);
1692 if (!c->ltab_cmt)
1693 return -ENOMEM;
1694
1695 c->lpt_buf = vmalloc(c->leb_size);
1696 if (!c->lpt_buf)
1697 return -ENOMEM;
1698
1699 if (c->big_lpt) {
1700 c->lsave = kmalloc(sizeof(int) * c->lsave_cnt, GFP_NOFS);
1701 if (!c->lsave)
1702 return -ENOMEM;
1703 err = read_lsave(c);
1704 if (err)
1705 return err;
1706 }
1707
1708 for (i = 0; i < c->lpt_lebs; i++)
1709 if (c->ltab[i].free == c->leb_size) {
1710 err = ubifs_leb_unmap(c, i + c->lpt_first);
1711 if (err)
1712 return err;
1713 }
1714
1715 return 0;
1716}
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730int ubifs_lpt_init(struct ubifs_info *c, int rd, int wr)
1731{
1732 int err;
1733
1734 if (rd) {
1735 err = lpt_init_rd(c);
1736 if (err)
1737 goto out_err;
1738 }
1739
1740 if (wr) {
1741 err = lpt_init_wr(c);
1742 if (err)
1743 goto out_err;
1744 }
1745
1746 return 0;
1747
1748out_err:
1749 if (wr)
1750 ubifs_lpt_free(c, 1);
1751 if (rd)
1752 ubifs_lpt_free(c, 0);
1753 return err;
1754}
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767struct lpt_scan_node {
1768 union {
1769 struct ubifs_nnode nnode;
1770 struct ubifs_pnode pnode;
1771 struct ubifs_cnode cnode;
1772 };
1773 int in_tree;
1774 union {
1775 struct ubifs_nnode *nnode;
1776 struct ubifs_pnode *pnode;
1777 struct ubifs_cnode *cnode;
1778 } ptr;
1779};
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791static struct ubifs_nnode *scan_get_nnode(struct ubifs_info *c,
1792 struct lpt_scan_node *path,
1793 struct ubifs_nnode *parent, int iip)
1794{
1795 struct ubifs_nbranch *branch;
1796 struct ubifs_nnode *nnode;
1797 void *buf = c->lpt_nod_buf;
1798 int err;
1799
1800 branch = &parent->nbranch[iip];
1801 nnode = branch->nnode;
1802 if (nnode) {
1803 path->in_tree = 1;
1804 path->ptr.nnode = nnode;
1805 return nnode;
1806 }
1807 nnode = &path->nnode;
1808 path->in_tree = 0;
1809 path->ptr.nnode = nnode;
1810 memset(nnode, 0, sizeof(struct ubifs_nnode));
1811 if (branch->lnum == 0) {
1812
1813
1814
1815
1816
1817
1818 if (c->big_lpt)
1819 nnode->num = calc_nnode_num_from_parent(c, parent, iip);
1820 } else {
1821 err = ubifs_leb_read(c, branch->lnum, buf, branch->offs,
1822 c->nnode_sz, 1);
1823 if (err)
1824 return ERR_PTR(err);
1825 err = ubifs_unpack_nnode(c, buf, nnode);
1826 if (err)
1827 return ERR_PTR(err);
1828 }
1829 err = validate_nnode(c, nnode, parent, iip);
1830 if (err)
1831 return ERR_PTR(err);
1832 if (!c->big_lpt)
1833 nnode->num = calc_nnode_num_from_parent(c, parent, iip);
1834 nnode->level = parent->level - 1;
1835 nnode->parent = parent;
1836 nnode->iip = iip;
1837 return nnode;
1838}
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850static struct ubifs_pnode *scan_get_pnode(struct ubifs_info *c,
1851 struct lpt_scan_node *path,
1852 struct ubifs_nnode *parent, int iip)
1853{
1854 struct ubifs_nbranch *branch;
1855 struct ubifs_pnode *pnode;
1856 void *buf = c->lpt_nod_buf;
1857 int err;
1858
1859 branch = &parent->nbranch[iip];
1860 pnode = branch->pnode;
1861 if (pnode) {
1862 path->in_tree = 1;
1863 path->ptr.pnode = pnode;
1864 return pnode;
1865 }
1866 pnode = &path->pnode;
1867 path->in_tree = 0;
1868 path->ptr.pnode = pnode;
1869 memset(pnode, 0, sizeof(struct ubifs_pnode));
1870 if (branch->lnum == 0) {
1871
1872
1873
1874
1875
1876 int i;
1877
1878 if (c->big_lpt)
1879 pnode->num = calc_pnode_num_from_parent(c, parent, iip);
1880 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
1881 struct ubifs_lprops * const lprops = &pnode->lprops[i];
1882
1883 lprops->free = c->leb_size;
1884 lprops->flags = ubifs_categorize_lprops(c, lprops);
1885 }
1886 } else {
1887 ubifs_assert(branch->lnum >= c->lpt_first &&
1888 branch->lnum <= c->lpt_last);
1889 ubifs_assert(branch->offs >= 0 && branch->offs < c->leb_size);
1890 err = ubifs_leb_read(c, branch->lnum, buf, branch->offs,
1891 c->pnode_sz, 1);
1892 if (err)
1893 return ERR_PTR(err);
1894 err = unpack_pnode(c, buf, pnode);
1895 if (err)
1896 return ERR_PTR(err);
1897 }
1898 err = validate_pnode(c, pnode, parent, iip);
1899 if (err)
1900 return ERR_PTR(err);
1901 if (!c->big_lpt)
1902 pnode->num = calc_pnode_num_from_parent(c, parent, iip);
1903 pnode->parent = parent;
1904 pnode->iip = iip;
1905 set_pnode_lnum(c, pnode);
1906 return pnode;
1907}
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919int ubifs_lpt_scan_nolock(struct ubifs_info *c, int start_lnum, int end_lnum,
1920 ubifs_lpt_scan_callback scan_cb, void *data)
1921{
1922 int err = 0, i, h, iip, shft;
1923 struct ubifs_nnode *nnode;
1924 struct ubifs_pnode *pnode;
1925 struct lpt_scan_node *path;
1926
1927 if (start_lnum == -1) {
1928 start_lnum = end_lnum + 1;
1929 if (start_lnum >= c->leb_cnt)
1930 start_lnum = c->main_first;
1931 }
1932
1933 ubifs_assert(start_lnum >= c->main_first && start_lnum < c->leb_cnt);
1934 ubifs_assert(end_lnum >= c->main_first && end_lnum < c->leb_cnt);
1935
1936 if (!c->nroot) {
1937 err = ubifs_read_nnode(c, NULL, 0);
1938 if (err)
1939 return err;
1940 }
1941
1942 path = kmalloc(sizeof(struct lpt_scan_node) * (c->lpt_hght + 1),
1943 GFP_NOFS);
1944 if (!path)
1945 return -ENOMEM;
1946
1947 path[0].ptr.nnode = c->nroot;
1948 path[0].in_tree = 1;
1949again:
1950
1951 nnode = c->nroot;
1952 i = start_lnum - c->main_first;
1953 shft = c->lpt_hght * UBIFS_LPT_FANOUT_SHIFT;
1954 for (h = 1; h < c->lpt_hght; h++) {
1955 iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
1956 shft -= UBIFS_LPT_FANOUT_SHIFT;
1957 nnode = scan_get_nnode(c, path + h, nnode, iip);
1958 if (IS_ERR(nnode)) {
1959 err = PTR_ERR(nnode);
1960 goto out;
1961 }
1962 }
1963 iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
1964 pnode = scan_get_pnode(c, path + h, nnode, iip);
1965 if (IS_ERR(pnode)) {
1966 err = PTR_ERR(pnode);
1967 goto out;
1968 }
1969 iip = (i & (UBIFS_LPT_FANOUT - 1));
1970
1971
1972 while (1) {
1973 struct ubifs_lprops *lprops = &pnode->lprops[iip];
1974 int ret, lnum = lprops->lnum;
1975
1976 ret = scan_cb(c, lprops, path[h].in_tree, data);
1977 if (ret < 0) {
1978 err = ret;
1979 goto out;
1980 }
1981 if (ret & LPT_SCAN_ADD) {
1982
1983 for (h = 1; h < c->lpt_hght; h++) {
1984 const size_t sz = sizeof(struct ubifs_nnode);
1985 struct ubifs_nnode *parent;
1986
1987 if (path[h].in_tree)
1988 continue;
1989 nnode = kmemdup(&path[h].nnode, sz, GFP_NOFS);
1990 if (!nnode) {
1991 err = -ENOMEM;
1992 goto out;
1993 }
1994 parent = nnode->parent;
1995 parent->nbranch[nnode->iip].nnode = nnode;
1996 path[h].ptr.nnode = nnode;
1997 path[h].in_tree = 1;
1998 path[h + 1].cnode.parent = nnode;
1999 }
2000 if (path[h].in_tree)
2001 ubifs_ensure_cat(c, lprops);
2002 else {
2003 const size_t sz = sizeof(struct ubifs_pnode);
2004 struct ubifs_nnode *parent;
2005
2006 pnode = kmemdup(&path[h].pnode, sz, GFP_NOFS);
2007 if (!pnode) {
2008 err = -ENOMEM;
2009 goto out;
2010 }
2011 parent = pnode->parent;
2012 parent->nbranch[pnode->iip].pnode = pnode;
2013 path[h].ptr.pnode = pnode;
2014 path[h].in_tree = 1;
2015 update_cats(c, pnode);
2016 c->pnodes_have += 1;
2017 }
2018 err = dbg_check_lpt_nodes(c, (struct ubifs_cnode *)
2019 c->nroot, 0, 0);
2020 if (err)
2021 goto out;
2022 err = dbg_check_cats(c);
2023 if (err)
2024 goto out;
2025 }
2026 if (ret & LPT_SCAN_STOP) {
2027 err = 0;
2028 break;
2029 }
2030
2031 if (lnum == end_lnum) {
2032
2033
2034
2035
2036 err = -ENOSPC;
2037 goto out;
2038 }
2039 if (lnum + 1 >= c->leb_cnt) {
2040
2041 start_lnum = c->main_first;
2042 goto again;
2043 }
2044 if (iip + 1 < UBIFS_LPT_FANOUT) {
2045
2046 iip += 1;
2047 continue;
2048 }
2049
2050 iip = pnode->iip;
2051 while (1) {
2052 h -= 1;
2053 ubifs_assert(h >= 0);
2054 nnode = path[h].ptr.nnode;
2055 if (iip + 1 < UBIFS_LPT_FANOUT)
2056 break;
2057 iip = nnode->iip;
2058 }
2059
2060 iip += 1;
2061
2062 h += 1;
2063 for (; h < c->lpt_hght; h++) {
2064 nnode = scan_get_nnode(c, path + h, nnode, iip);
2065 if (IS_ERR(nnode)) {
2066 err = PTR_ERR(nnode);
2067 goto out;
2068 }
2069 iip = 0;
2070 }
2071 pnode = scan_get_pnode(c, path + h, nnode, iip);
2072 if (IS_ERR(pnode)) {
2073 err = PTR_ERR(pnode);
2074 goto out;
2075 }
2076 iip = 0;
2077 }
2078out:
2079 kfree(path);
2080 return err;
2081}
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091static int dbg_chk_pnode(struct ubifs_info *c, struct ubifs_pnode *pnode,
2092 int col)
2093{
2094 int i;
2095
2096 if (pnode->num != col) {
2097 ubifs_err(c, "pnode num %d expected %d parent num %d iip %d",
2098 pnode->num, col, pnode->parent->num, pnode->iip);
2099 return -EINVAL;
2100 }
2101 for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
2102 struct ubifs_lprops *lp, *lprops = &pnode->lprops[i];
2103 int lnum = (pnode->num << UBIFS_LPT_FANOUT_SHIFT) + i +
2104 c->main_first;
2105 int found, cat = lprops->flags & LPROPS_CAT_MASK;
2106 struct ubifs_lpt_heap *heap;
2107 struct list_head *list = NULL;
2108
2109 if (lnum >= c->leb_cnt)
2110 continue;
2111 if (lprops->lnum != lnum) {
2112 ubifs_err(c, "bad LEB number %d expected %d",
2113 lprops->lnum, lnum);
2114 return -EINVAL;
2115 }
2116 if (lprops->flags & LPROPS_TAKEN) {
2117 if (cat != LPROPS_UNCAT) {
2118 ubifs_err(c, "LEB %d taken but not uncat %d",
2119 lprops->lnum, cat);
2120 return -EINVAL;
2121 }
2122 continue;
2123 }
2124 if (lprops->flags & LPROPS_INDEX) {
2125 switch (cat) {
2126 case LPROPS_UNCAT:
2127 case LPROPS_DIRTY_IDX:
2128 case LPROPS_FRDI_IDX:
2129 break;
2130 default:
2131 ubifs_err(c, "LEB %d index but cat %d",
2132 lprops->lnum, cat);
2133 return -EINVAL;
2134 }
2135 } else {
2136 switch (cat) {
2137 case LPROPS_UNCAT:
2138 case LPROPS_DIRTY:
2139 case LPROPS_FREE:
2140 case LPROPS_EMPTY:
2141 case LPROPS_FREEABLE:
2142 break;
2143 default:
2144 ubifs_err(c, "LEB %d not index but cat %d",
2145 lprops->lnum, cat);
2146 return -EINVAL;
2147 }
2148 }
2149 switch (cat) {
2150 case LPROPS_UNCAT:
2151 list = &c->uncat_list;
2152 break;
2153 case LPROPS_EMPTY:
2154 list = &c->empty_list;
2155 break;
2156 case LPROPS_FREEABLE:
2157 list = &c->freeable_list;
2158 break;
2159 case LPROPS_FRDI_IDX:
2160 list = &c->frdi_idx_list;
2161 break;
2162 }
2163 found = 0;
2164 switch (cat) {
2165 case LPROPS_DIRTY:
2166 case LPROPS_DIRTY_IDX:
2167 case LPROPS_FREE:
2168 heap = &c->lpt_heap[cat - 1];
2169 if (lprops->hpos < heap->cnt &&
2170 heap->arr[lprops->hpos] == lprops)
2171 found = 1;
2172 break;
2173 case LPROPS_UNCAT:
2174 case LPROPS_EMPTY:
2175 case LPROPS_FREEABLE:
2176 case LPROPS_FRDI_IDX:
2177 list_for_each_entry(lp, list, list)
2178 if (lprops == lp) {
2179 found = 1;
2180 break;
2181 }
2182 break;
2183 }
2184 if (!found) {
2185 ubifs_err(c, "LEB %d cat %d not found in cat heap/list",
2186 lprops->lnum, cat);
2187 return -EINVAL;
2188 }
2189 switch (cat) {
2190 case LPROPS_EMPTY:
2191 if (lprops->free != c->leb_size) {
2192 ubifs_err(c, "LEB %d cat %d free %d dirty %d",
2193 lprops->lnum, cat, lprops->free,
2194 lprops->dirty);
2195 return -EINVAL;
2196 }
2197 break;
2198 case LPROPS_FREEABLE:
2199 case LPROPS_FRDI_IDX:
2200 if (lprops->free + lprops->dirty != c->leb_size) {
2201 ubifs_err(c, "LEB %d cat %d free %d dirty %d",
2202 lprops->lnum, cat, lprops->free,
2203 lprops->dirty);
2204 return -EINVAL;
2205 }
2206 break;
2207 }
2208 }
2209 return 0;
2210}
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221int dbg_check_lpt_nodes(struct ubifs_info *c, struct ubifs_cnode *cnode,
2222 int row, int col)
2223{
2224 struct ubifs_nnode *nnode, *nn;
2225 struct ubifs_cnode *cn;
2226 int num, iip = 0, err;
2227
2228 if (!dbg_is_chk_lprops(c))
2229 return 0;
2230
2231 while (cnode) {
2232 ubifs_assert(row >= 0);
2233 nnode = cnode->parent;
2234 if (cnode->level) {
2235
2236 num = calc_nnode_num(row, col);
2237 if (cnode->num != num) {
2238 ubifs_err(c, "nnode num %d expected %d parent num %d iip %d",
2239 cnode->num, num,
2240 (nnode ? nnode->num : 0), cnode->iip);
2241 return -EINVAL;
2242 }
2243 nn = (struct ubifs_nnode *)cnode;
2244 while (iip < UBIFS_LPT_FANOUT) {
2245 cn = nn->nbranch[iip].cnode;
2246 if (cn) {
2247
2248 row += 1;
2249 col <<= UBIFS_LPT_FANOUT_SHIFT;
2250 col += iip;
2251 iip = 0;
2252 cnode = cn;
2253 break;
2254 }
2255
2256 iip += 1;
2257 }
2258 if (iip < UBIFS_LPT_FANOUT)
2259 continue;
2260 } else {
2261 struct ubifs_pnode *pnode;
2262
2263
2264 pnode = (struct ubifs_pnode *)cnode;
2265 err = dbg_chk_pnode(c, pnode, col);
2266 if (err)
2267 return err;
2268 }
2269
2270 row -= 1;
2271 col >>= UBIFS_LPT_FANOUT_SHIFT;
2272 iip = cnode->iip + 1;
2273 cnode = (struct ubifs_cnode *)nnode;
2274 }
2275 return 0;
2276}
2277