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1 /* 1
2 * JFFS2 -- Journalling Flash File System, Ver
3 *
4 * Copyright © 2004 Ferenc Havasi <havasi@in
5 * Zoltan Sogor <weth@inf.u-
6 * Patrik Kluba <pajko@halom
7 * University of Szeged, Hun
8 * 2006 KaiGai Kohei <kaigai@ak.j
9 *
10 * For licensing information, see the file 'LI
11 *
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/mtd/mtd.h>
17 #include <linux/pagemap.h>
18 #include <linux/crc32.h>
19 #include <linux/compiler.h>
20 #include <linux/vmalloc.h>
21 #include "nodelist.h"
22 #include "debug.h"
23
24 int jffs2_sum_init(struct jffs2_sb_info *c)
25 {
26 c->summary = kzalloc(sizeof(struct jff
27
28 if (!c->summary) {
29 JFFS2_WARNING("Can't allocate
30 return -ENOMEM;
31 }
32
33 c->summary->sum_buf = vmalloc(c->secto
34
35 if (!c->summary->sum_buf) {
36 JFFS2_WARNING("Can't allocate
37 kfree(c->summary);
38 return -ENOMEM;
39 }
40
41 dbg_summary("returned successfully\n")
42
43 return 0;
44 }
45
46 void jffs2_sum_exit(struct jffs2_sb_info *c)
47 {
48 dbg_summary("called\n");
49
50 jffs2_sum_disable_collecting(c->summar
51
52 vfree(c->summary->sum_buf);
53 c->summary->sum_buf = NULL;
54
55 kfree(c->summary);
56 c->summary = NULL;
57 }
58
59 static int jffs2_sum_add_mem(struct jffs2_summ
60 {
61 if (!s->sum_list_head)
62 s->sum_list_head = (union jffs
63 if (s->sum_list_tail)
64 s->sum_list_tail->u.next = (un
65 s->sum_list_tail = (union jffs2_sum_me
66
67 switch (je16_to_cpu(item->u.nodetype))
68 case JFFS2_NODETYPE_INODE:
69 s->sum_size += JFFS2_S
70 s->sum_num++;
71 dbg_summary("inode (%u
72
73 break;
74 case JFFS2_NODETYPE_DIRENT:
75 s->sum_size += JFFS2_S
76 s->sum_num++;
77 dbg_summary("dirent (%
78
79 break;
80 #ifdef CONFIG_JFFS2_FS_XATTR
81 case JFFS2_NODETYPE_XATTR:
82 s->sum_size += JFFS2_S
83 s->sum_num++;
84 dbg_summary("xattr (xi
85 je32_to_cp
86 break;
87 case JFFS2_NODETYPE_XREF:
88 s->sum_size += JFFS2_S
89 s->sum_num++;
90 dbg_summary("xref adde
91 break;
92 #endif
93 default:
94 JFFS2_WARNING("UNKNOWN
95 je
96 return 1;
97 }
98 return 0;
99 }
100
101
102 /* The following 3 functions are called from s
103
104 int jffs2_sum_add_padding_mem(struct jffs2_sum
105 {
106 dbg_summary("called with %u\n", size);
107 s->sum_padded += size;
108 return 0;
109 }
110
111 int jffs2_sum_add_inode_mem(struct jffs2_summa
112 uint32_t ofs)
113 {
114 struct jffs2_sum_inode_mem *temp = kma
115
116 if (!temp)
117 return -ENOMEM;
118
119 temp->nodetype = ri->nodetype;
120 temp->inode = ri->ino;
121 temp->version = ri->version;
122 temp->offset = cpu_to_je32(ofs); /* re
123 temp->totlen = ri->totlen;
124 temp->next = NULL;
125
126 return jffs2_sum_add_mem(s, (union jff
127 }
128
129 int jffs2_sum_add_dirent_mem(struct jffs2_summ
130 uint32_t ofs)
131 {
132 struct jffs2_sum_dirent_mem *temp =
133 kmalloc(sizeof(struct jffs2_su
134
135 if (!temp)
136 return -ENOMEM;
137
138 temp->nodetype = rd->nodetype;
139 temp->totlen = rd->totlen;
140 temp->offset = cpu_to_je32(ofs);
141 temp->pino = rd->pino;
142 temp->version = rd->version;
143 temp->ino = rd->ino;
144 temp->nsize = rd->nsize;
145 temp->type = rd->type;
146 temp->next = NULL;
147
148 memcpy(temp->name, rd->name, rd->nsize
149
150 return jffs2_sum_add_mem(s, (union jff
151 }
152
153 #ifdef CONFIG_JFFS2_FS_XATTR
154 int jffs2_sum_add_xattr_mem(struct jffs2_summa
155 {
156 struct jffs2_sum_xattr_mem *temp;
157
158 temp = kmalloc(sizeof(struct jffs2_sum
159 if (!temp)
160 return -ENOMEM;
161
162 temp->nodetype = rx->nodetype;
163 temp->xid = rx->xid;
164 temp->version = rx->version;
165 temp->offset = cpu_to_je32(ofs);
166 temp->totlen = rx->totlen;
167 temp->next = NULL;
168
169 return jffs2_sum_add_mem(s, (union jff
170 }
171
172 int jffs2_sum_add_xref_mem(struct jffs2_summar
173 {
174 struct jffs2_sum_xref_mem *temp;
175
176 temp = kmalloc(sizeof(struct jffs2_sum
177 if (!temp)
178 return -ENOMEM;
179
180 temp->nodetype = rr->nodetype;
181 temp->offset = cpu_to_je32(ofs);
182 temp->next = NULL;
183
184 return jffs2_sum_add_mem(s, (union jff
185 }
186 #endif
187 /* Cleanup every collected summary information
188
189 static void jffs2_sum_clean_collected(struct j
190 {
191 union jffs2_sum_mem *temp;
192
193 if (!s->sum_list_head) {
194 dbg_summary("already empty\n")
195 }
196 while (s->sum_list_head) {
197 temp = s->sum_list_head;
198 s->sum_list_head = s->sum_list
199 kfree(temp);
200 }
201 s->sum_list_tail = NULL;
202 s->sum_padded = 0;
203 s->sum_num = 0;
204 }
205
206 void jffs2_sum_reset_collected(struct jffs2_su
207 {
208 dbg_summary("called\n");
209 jffs2_sum_clean_collected(s);
210 s->sum_size = 0;
211 }
212
213 void jffs2_sum_disable_collecting(struct jffs2
214 {
215 dbg_summary("called\n");
216 jffs2_sum_clean_collected(s);
217 s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE
218 }
219
220 int jffs2_sum_is_disabled(struct jffs2_summary
221 {
222 return (s->sum_size == JFFS2_SUMMARY_N
223 }
224
225 /* Move the collected summary information into
226
227 void jffs2_sum_move_collected(struct jffs2_sb_
228 {
229 dbg_summary("oldsize=0x%x oldnum=%u =>
230 c->summary->su
231 s->sum_size, s
232
233 c->summary->sum_size = s->sum_size;
234 c->summary->sum_num = s->sum_num;
235 c->summary->sum_padded = s->sum_padded
236 c->summary->sum_list_head = s->sum_lis
237 c->summary->sum_list_tail = s->sum_lis
238
239 s->sum_list_head = s->sum_list_tail =
240 }
241
242 /* Called from wbuf.c to collect writed node i
243
244 int jffs2_sum_add_kvec(struct jffs2_sb_info *c
245 unsigned long
246 {
247 union jffs2_node_union *node;
248 struct jffs2_eraseblock *jeb;
249
250 if (c->summary->sum_size == JFFS2_SUMM
251 dbg_summary("Summary is disabl
252 return 0;
253 }
254
255 node = invecs[0].iov_base;
256 jeb = &c->blocks[ofs / c->sector_size]
257 ofs -= jeb->offset;
258
259 switch (je16_to_cpu(node->u.nodetype))
260 case JFFS2_NODETYPE_INODE: {
261 struct jffs2_sum_inode
262 kmalloc(sizeof
263
264 if (!temp)
265 goto no_mem;
266
267 temp->nodetype = node-
268 temp->inode = node->i.
269 temp->version = node->
270 temp->offset = cpu_to_
271 temp->totlen = node->i
272 temp->next = NULL;
273
274 return jffs2_sum_add_m
275 }
276
277 case JFFS2_NODETYPE_DIRENT: {
278 struct jffs2_sum_diren
279 kmalloc(sizeof
280
281 if (!temp)
282 goto no_mem;
283
284 temp->nodetype = node-
285 temp->totlen = node->d
286 temp->offset = cpu_to_
287 temp->pino = node->d.p
288 temp->version = node->
289 temp->ino = node->d.in
290 temp->nsize = node->d.
291 temp->type = node->d.t
292 temp->next = NULL;
293
294 switch (count) {
295 case 1:
296 memcpy
297 break;
298
299 case 2:
300 memcpy
301 break;
302
303 default:
304 BUG();
305 break;
306 }
307
308 return jffs2_sum_add_m
309 }
310 #ifdef CONFIG_JFFS2_FS_XATTR
311 case JFFS2_NODETYPE_XATTR: {
312 struct jffs2_sum_xattr
313 temp = kmalloc(sizeof(
314 if (!temp)
315 goto no_mem;
316
317 temp->nodetype = node-
318 temp->xid = node->x.xi
319 temp->version = node->
320 temp->totlen = node->x
321 temp->offset = cpu_to_
322 temp->next = NULL;
323
324 return jffs2_sum_add_m
325 }
326 case JFFS2_NODETYPE_XREF: {
327 struct jffs2_sum_xref_
328 temp = kmalloc(sizeof(
329 if (!temp)
330 goto no_mem;
331 temp->nodetype = node-
332 temp->offset = cpu_to_
333 temp->next = NULL;
334
335 return jffs2_sum_add_m
336 }
337 #endif
338 case JFFS2_NODETYPE_PADDING:
339 dbg_summary("node PADD
340 c->summary->sum_padded
341 break;
342
343 case JFFS2_NODETYPE_CLEANMARKE
344 dbg_summary("node CLEA
345 break;
346
347 case JFFS2_NODETYPE_SUMMARY:
348 dbg_summary("node SUMM
349 break;
350
351 default:
352 /* If you implement a
353 summary support for
354 */
355 BUG();
356 break;
357 }
358
359 return 0;
360
361 no_mem:
362 JFFS2_WARNING("MEMORY ALLOCATION ERROR
363 return -ENOMEM;
364 }
365
366 static struct jffs2_raw_node_ref *sum_link_nod
367
368
369
370 {
371 /* If there was a gap, mark it dirty *
372 if ((ofs & ~3) > c->sector_size - jeb-
373 /* Ew. Summary doesn't actuall
374 jffs2_scan_dirty_space(c, jeb,
375 }
376
377 return jffs2_link_node_ref(c, jeb, jeb
378 }
379
380 /* Process the stored summary information - he
381
382 static int jffs2_sum_process_sum_data(struct j
383 struct jffs2_r
384 {
385 struct jffs2_inode_cache *ic;
386 struct jffs2_full_dirent *fd;
387 void *sp;
388 int i, ino;
389 int err;
390
391 sp = summary->sum;
392
393 for (i=0; i<je32_to_cpu(summary->sum_n
394 dbg_summary("processing summar
395
396 cond_resched();
397
398 /* Make sure there's a spare r
399 err = jffs2_prealloc_raw_node_
400 if (err)
401 return err;
402
403 switch (je16_to_cpu(((struct j
404 case JFFS2_NODETYPE_IN
405 struct jffs2_s
406 spi = sp;
407
408 ino = je32_to_
409
410 dbg_summary("I
411 je
412 je
413
414 ic = jffs2_sca
415 if (!ic) {
416 JFFS2_
417 return
418 }
419
420 sum_link_node_
421
422
423 *pseudo_random
424
425 sp += JFFS2_SU
426
427 break;
428 }
429
430 case JFFS2_NODETYPE_DI
431 struct jffs2_s
432 int checkedlen
433 spd = sp;
434
435 dbg_summary("D
436 je
437 je
438
439
440 /* This should
441 checkedlen = s
442 if (!checkedle
443 printk
444
445 return
446 }
447 if (checkedlen
448 printk
449
450 }
451
452
453 fd = jffs2_all
454 if (!fd)
455 return
456
457 memcpy(&fd->na
458 fd->name[check
459
460 ic = jffs2_sca
461 if (!ic) {
462 jffs2_
463 return
464 }
465
466 fd->raw = sum_
467
468
469 fd->next = NUL
470 fd->version =
471 fd->ino = je32
472 fd->nhash = fu
473 fd->type = spd
474
475 jffs2_add_fd_t
476
477 *pseudo_random
478
479 sp += JFFS2_SU
480
481 break;
482 }
483 #ifdef CONFIG_JFFS2_FS_XATTR
484 case JFFS2_NODETYPE_XA
485 struct jffs2_x
486 struct jffs2_s
487
488 spx = (struct
489 dbg_summary("x
490 je
491 je
492 je
493
494 xd = jffs2_set
495
496 if (IS_ERR(xd)
497 return
498 if (xd->versio
499 /* nod
500 struct
501
502
503 raw->n
504 xd->no
505 } else {
506 xd->ve
507 sum_li
508
509 }
510 *pseudo_random
511 sp += JFFS2_SU
512
513 break;
514 }
515 case JFFS2_NODETYPE_XR
516 struct jffs2_x
517 struct jffs2_s
518
519 spr = (struct
520 dbg_summary("x
521 je
522 je
523 (u
524
525 ref = jffs2_al
526 if (!ref) {
527 JFFS2_
528 return
529 }
530 ref->next = c-
531 c->xref_temp =
532
533 sum_link_node_
534
535
536 *pseudo_random
537 sp += JFFS2_SU
538
539 break;
540 }
541 #endif
542 default : {
543 uint16_t nodet
544 JFFS2_WARNING(
545 if ((nodetype
546 return
547
548 /* For compati
549 c->wasted_size
550 c->free_size +
551 c->used_size -
552 c->dirty_size
553 jeb->wasted_si
554 jeb->free_size
555
556 jffs2_free_jeb
557 return -ENOTRE
558 }
559 }
560 }
561 return 0;
562 }
563
564 /* Process the summary node - called from jffs
565 int jffs2_sum_scan_sumnode(struct jffs2_sb_inf
566 struct jffs2_raw_su
567 uint32_t *pseudo_ra
568 {
569 struct jffs2_unknown_node crcnode;
570 int ret, ofs;
571 uint32_t crc;
572
573 ofs = c->sector_size - sumsize;
574
575 dbg_summary("summary found for 0x%08x
576 jeb->offset, jeb->offset +
577
578 /* OK, now check for node validity and
579 crcnode.magic = cpu_to_je16(JFFS2_MAGI
580 crcnode.nodetype = cpu_to_je16(JFFS2_N
581 crcnode.totlen = summary->totlen;
582 crc = crc32(0, &crcnode, sizeof(crcnod
583
584 if (je32_to_cpu(summary->hdr_crc) != c
585 dbg_summary("Summary node head
586 "no summary at
587 goto crc_err;
588 }
589
590 if (je32_to_cpu(summary->totlen) != su
591 dbg_summary("Summary node is c
592 goto crc_err;
593 }
594
595 crc = crc32(0, summary, sizeof(struct
596
597 if (je32_to_cpu(summary->node_crc) !=
598 dbg_summary("Summary node is c
599 goto crc_err;
600 }
601
602 crc = crc32(0, summary->sum, sumsize -
603
604 if (je32_to_cpu(summary->sum_crc) != c
605 dbg_summary("Summary node data
606 goto crc_err;
607 }
608
609 if ( je32_to_cpu(summary->cln_mkr) ) {
610
611 dbg_summary("Summary : CLEANMA
612
613 ret = jffs2_prealloc_raw_node_
614 if (ret)
615 return ret;
616
617 if (je32_to_cpu(summary->cln_m
618 dbg_summary("CLEANMARK
619 je32_to_cpu(su
620 if ((ret = jffs2_scan_
621 return ret;
622 } else if (jeb->first_node) {
623 dbg_summary("CLEANMARK
624 "(0x%0
625 if ((ret = jffs2_scan_
626 return ret;
627 } else {
628 jffs2_link_node_ref(c,
629 je
630 }
631 }
632
633 ret = jffs2_sum_process_sum_data(c, je
634 /* -ENOTRECOVERABLE isn't a fatal erro
635 scan of this eraseblock. So return
636 if (ret == -ENOTRECOVERABLE)
637 return 0;
638 if (ret)
639 return ret; /* rea
640
641 /* for PARANOIA_CHECK */
642 ret = jffs2_prealloc_raw_node_refs(c,
643 if (ret)
644 return ret;
645
646 sum_link_node_ref(c, jeb, ofs | REF_NO
647
648 if (unlikely(jeb->free_size)) {
649 JFFS2_WARNING("Free size 0x%x
650 jeb->free_size,
651 jeb->wasted_size += jeb->free_
652 c->wasted_size += jeb->free_si
653 c->free_size -= jeb->free_size
654 jeb->free_size = 0;
655 }
656
657 return jffs2_scan_classify_jeb(c, jeb)
658
659 crc_err:
660 JFFS2_WARNING("Summary node crc error,
661
662 return 0;
663 }
664
665 /* Write summary data to flash - helper functi
666
667 static int jffs2_sum_write_data(struct jffs2_s
668 uint32
669 {
670 struct jffs2_raw_summary isum;
671 union jffs2_sum_mem *temp;
672 struct jffs2_sum_marker *sm;
673 struct kvec vecs[2];
674 uint32_t sum_ofs;
675 void *wpage;
676 int ret;
677 size_t retlen;
678
679 memset(c->summary->sum_buf, 0xff, data
680 memset(&isum, 0, sizeof(isum));
681
682 isum.magic = cpu_to_je16(JFFS2_MAGIC_B
683 isum.nodetype = cpu_to_je16(JFFS2_NODE
684 isum.totlen = cpu_to_je32(infosize);
685 isum.hdr_crc = cpu_to_je32(crc32(0, &i
686 isum.padded = cpu_to_je32(c->summary->
687 isum.cln_mkr = cpu_to_je32(c->cleanmar
688 isum.sum_num = cpu_to_je32(c->summary-
689 wpage = c->summary->sum_buf;
690
691 while (c->summary->sum_num) {
692 temp = c->summary->sum_list_he
693
694 switch (je16_to_cpu(temp->u.no
695 case JFFS2_NODETYPE_IN
696 struct jffs2_s
697
698 sino_ptr->node
699 sino_ptr->inod
700 sino_ptr->vers
701 sino_ptr->offs
702 sino_ptr->totl
703
704 wpage += JFFS2
705
706 break;
707 }
708
709 case JFFS2_NODETYPE_DI
710 struct jffs2_s
711
712 sdrnt_ptr->nod
713 sdrnt_ptr->tot
714 sdrnt_ptr->off
715 sdrnt_ptr->pin
716 sdrnt_ptr->ver
717 sdrnt_ptr->ino
718 sdrnt_ptr->nsi
719 sdrnt_ptr->typ
720
721 memcpy(sdrnt_p
722
723
724 wpage += JFFS2
725
726 break;
727 }
728 #ifdef CONFIG_JFFS2_FS_XATTR
729 case JFFS2_NODETYPE_XA
730 struct jffs2_s
731
732 temp = c->summ
733 sxattr_ptr->no
734 sxattr_ptr->xi
735 sxattr_ptr->ve
736 sxattr_ptr->of
737 sxattr_ptr->to
738
739 wpage += JFFS2
740 break;
741 }
742 case JFFS2_NODETYPE_XR
743 struct jffs2_s
744
745 temp = c->summ
746 sxref_ptr->nod
747 sxref_ptr->off
748
749 wpage += JFFS2
750 break;
751 }
752 #endif
753 default : {
754 if ((je16_to_c
755 == JFFS2_F
756 dbg_su
757
758 jffs2_
759 } else {
760 BUG();
761 }
762 }
763 }
764
765 c->summary->sum_list_head = te
766 kfree(temp);
767
768 c->summary->sum_num--;
769 }
770
771 jffs2_sum_reset_collected(c->summary);
772
773 wpage += padsize;
774
775 sm = wpage;
776 sm->offset = cpu_to_je32(c->sector_siz
777 sm->magic = cpu_to_je32(JFFS2_SUM_MAGI
778
779 isum.sum_crc = cpu_to_je32(crc32(0, c-
780 isum.node_crc = cpu_to_je32(crc32(0, &
781
782 vecs[0].iov_base = &isum;
783 vecs[0].iov_len = sizeof(isum);
784 vecs[1].iov_base = c->summary->sum_buf
785 vecs[1].iov_len = datasize;
786
787 sum_ofs = jeb->offset + c->sector_size
788
789 dbg_summary("JFFS2: writing out data t
790 sum_ofs);
791
792 ret = jffs2_flash_writev(c, vecs, 2, s
793
794 if (ret || (retlen != infosize)) {
795
796 JFFS2_WARNING("Write of %u byt
797 infosize, sum_of
798
799 if (retlen) {
800 /* Waste remaining spa
801 spin_lock(&c->erase_co
802 jffs2_link_node_ref(c,
803 spin_unlock(&c->erase_
804 }
805
806 c->summary->sum_size = JFFS2_S
807
808 return 0;
809 }
810
811 spin_lock(&c->erase_completion_lock);
812 jffs2_link_node_ref(c, jeb, sum_ofs |
813 spin_unlock(&c->erase_completion_lock)
814
815 return 0;
816 }
817
818 /* Write out summary information - called from
819
820 int jffs2_sum_write_sumnode(struct jffs2_sb_in
821 {
822 int datasize, infosize, padsize;
823 struct jffs2_eraseblock *jeb;
824 int ret;
825
826 dbg_summary("called\n");
827
828 spin_unlock(&c->erase_completion_lock)
829
830 jeb = c->nextblock;
831 jffs2_prealloc_raw_node_refs(c, jeb, 1
832
833 if (!c->summary->sum_num || !c->summar
834 JFFS2_WARNING("Empty summary i
835 BUG();
836 }
837
838 datasize = c->summary->sum_size + size
839 infosize = sizeof(struct jffs2_raw_sum
840 padsize = jeb->free_size - infosize;
841 infosize += padsize;
842 datasize += padsize;
843
844 /* Is there enough space for summary?
845 if (padsize < 0) {
846 /* don't try to write out summ
847 jffs2_sum_disable_collecting(c
848
849 JFFS2_WARNING("Not enough spac
850 spin_lock(&c->erase_completion
851 return 0;
852 }
853
854 ret = jffs2_sum_write_data(c, jeb, inf
855 spin_lock(&c->erase_completion_lock);
856 return ret;
857 }
858
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