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-rw-r--r--fs/jffs2/summary.c729
1 files changed, 729 insertions, 0 deletions
diff --git a/fs/jffs2/summary.c b/fs/jffs2/summary.c
new file mode 100644
index 000000000000..cb5dd8f11e73
--- /dev/null
+++ b/fs/jffs2/summary.c
@@ -0,0 +1,729 @@
1/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright (C) 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
5 * Zoltan Sogor <weth@inf.u-szeged.hu>,
6 * Patrik Kluba <pajko@halom.u-szeged.hu>,
7 * University of Szeged, Hungary
8 *
9 * For licensing information, see the file 'LICENCE' in this directory.
10 *
11 * $Id: summary.c,v 1.1 2005/09/07 08:34:54 havasi Exp $
12 *
13 */
14
15#include <linux/kernel.h>
16#include <linux/sched.h>
17#include <linux/slab.h>
18#include <linux/mtd/mtd.h>
19#include <linux/pagemap.h>
20#include <linux/crc32.h>
21#include <linux/compiler.h>
22#include <linux/vmalloc.h>
23#include "nodelist.h"
24#include "debug.h"
25
26int jffs2_sum_init(struct jffs2_sb_info *c)
27{
28 c->summary = kmalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
29
30 if (!c->summary) {
31 JFFS2_WARNING("Can't allocate memory for summary information!\n");
32 return -ENOMEM;
33 }
34
35 memset(c->summary, 0, sizeof(struct jffs2_summary));
36
37 c->summary->sum_buf = vmalloc(c->sector_size);
38
39 if (!c->summary->sum_buf) {
40 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
41 return -ENOMEM;
42 }
43
44 JFFS2_DBG_SUMMARY("returned succesfully\n");
45
46 return 0;
47}
48
49void jffs2_sum_exit(struct jffs2_sb_info *c)
50{
51 JFFS2_DBG_SUMMARY("called\n");
52
53 jffs2_sum_disable_collecting(c->summary);
54
55 vfree(c->summary->sum_buf);
56 c->summary->sum_buf = NULL;
57
58 kfree(c->summary);
59 c->summary = NULL;
60}
61
62static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
63{
64 if (!s->sum_list_head)
65 s->sum_list_head = (union jffs2_sum_mem *) item;
66 if (s->sum_list_tail)
67 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
68 s->sum_list_tail = (union jffs2_sum_mem *) item;
69
70 switch (je16_to_cpu(item->u.nodetype)) {
71 case JFFS2_NODETYPE_INODE:
72 s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
73 s->sum_num++;
74 JFFS2_DBG_SUMMARY("inode (%u) added to summary\n",
75 je32_to_cpu(item->i.inode));
76 break;
77 case JFFS2_NODETYPE_DIRENT:
78 s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
79 s->sum_num++;
80 JFFS2_DBG_SUMMARY("dirent (%u) added to summary\n",
81 je32_to_cpu(item->d.ino));
82 break;
83 default:
84 JFFS2_WARNING("UNKNOWN node type %u\n",
85 je16_to_cpu(item->u.nodetype));
86 return 1;
87 }
88 return 0;
89}
90
91
92/* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
93
94int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
95{
96 JFFS2_DBG_SUMMARY("called with %u\n", size);
97 s->sum_padded += size;
98 return 0;
99}
100
101int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
102 uint32_t ofs)
103{
104 struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
105
106 if (!temp)
107 return -ENOMEM;
108
109 temp->nodetype = ri->nodetype;
110 temp->inode = ri->ino;
111 temp->version = ri->version;
112 temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */
113 temp->totlen = ri->totlen;
114 temp->next = NULL;
115
116 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
117}
118
119int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
120 uint32_t ofs)
121{
122 struct jffs2_sum_dirent_mem *temp =
123 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
124
125 if (!temp)
126 return -ENOMEM;
127
128 temp->nodetype = rd->nodetype;
129 temp->totlen = rd->totlen;
130 temp->offset = cpu_to_je32(ofs); /* relative from the begining of the jeb */
131 temp->pino = rd->pino;
132 temp->version = rd->version;
133 temp->ino = rd->ino;
134 temp->nsize = rd->nsize;
135 temp->type = rd->type;
136 temp->next = NULL;
137
138 memcpy(temp->name, rd->name, rd->nsize);
139
140 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
141}
142
143/* Cleanup every collected summary information */
144
145static void jffs2_sum_clean_collected(struct jffs2_summary *s)
146{
147 union jffs2_sum_mem *temp;
148
149 if (!s->sum_list_head) {
150 JFFS2_DBG_SUMMARY("already empty\n");
151 }
152 while (s->sum_list_head) {
153 temp = s->sum_list_head;
154 s->sum_list_head = s->sum_list_head->u.next;
155 kfree(temp);
156 }
157 s->sum_list_tail = NULL;
158 s->sum_padded = 0;
159 s->sum_num = 0;
160}
161
162void jffs2_sum_reset_collected(struct jffs2_summary *s)
163{
164 JFFS2_DBG_SUMMARY("called\n");
165 jffs2_sum_clean_collected(s);
166 s->sum_size = 0;
167}
168
169void jffs2_sum_disable_collecting(struct jffs2_summary *s)
170{
171 JFFS2_DBG_SUMMARY("called\n");
172 jffs2_sum_clean_collected(s);
173 s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
174}
175
176int jffs2_sum_is_disabled(struct jffs2_summary *s)
177{
178 return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
179}
180
181/* Move the collected summary information into sb (called from scan.c) */
182
183void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
184{
185 JFFS2_DBG_SUMMARY("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
186 c->summary->sum_size, c->summary->sum_num,
187 s->sum_size, s->sum_num);
188
189 c->summary->sum_size = s->sum_size;
190 c->summary->sum_num = s->sum_num;
191 c->summary->sum_padded = s->sum_padded;
192 c->summary->sum_list_head = s->sum_list_head;
193 c->summary->sum_list_tail = s->sum_list_tail;
194
195 s->sum_list_head = s->sum_list_tail = NULL;
196}
197
198/* Called from wbuf.c to collect writed node info */
199
200int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
201 unsigned long count, uint32_t ofs)
202{
203 union jffs2_node_union *node;
204 struct jffs2_eraseblock *jeb;
205
206 node = invecs[0].iov_base;
207 jeb = &c->blocks[ofs / c->sector_size];
208 ofs -= jeb->offset;
209
210 switch (je16_to_cpu(node->u.nodetype)) {
211 case JFFS2_NODETYPE_INODE: {
212 struct jffs2_sum_inode_mem *temp =
213 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
214
215 if (!temp)
216 goto no_mem;
217
218 temp->nodetype = node->i.nodetype;
219 temp->inode = node->i.ino;
220 temp->version = node->i.version;
221 temp->offset = cpu_to_je32(ofs);
222 temp->totlen = node->i.totlen;
223 temp->next = NULL;
224
225 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
226 }
227
228 case JFFS2_NODETYPE_DIRENT: {
229 struct jffs2_sum_dirent_mem *temp =
230 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
231
232 if (!temp)
233 goto no_mem;
234
235 temp->nodetype = node->d.nodetype;
236 temp->totlen = node->d.totlen;
237 temp->offset = cpu_to_je32(ofs);
238 temp->pino = node->d.pino;
239 temp->version = node->d.version;
240 temp->ino = node->d.ino;
241 temp->nsize = node->d.nsize;
242 temp->type = node->d.type;
243 temp->next = NULL;
244
245 switch (count) {
246 case 1:
247 memcpy(temp->name,node->d.name,node->d.nsize);
248 break;
249
250 case 2:
251 memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
252 break;
253
254 default:
255 BUG(); /* impossible count value */
256 break;
257 }
258
259 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
260 }
261
262 case JFFS2_NODETYPE_PADDING:
263 JFFS2_DBG_SUMMARY("node PADDING\n");
264 c->summary->sum_padded += je32_to_cpu(node->u.totlen);
265 break;
266
267 case JFFS2_NODETYPE_CLEANMARKER:
268 JFFS2_DBG_SUMMARY("node CLEANMARKER\n");
269 break;
270
271 case JFFS2_NODETYPE_SUMMARY:
272 JFFS2_DBG_SUMMARY("node SUMMARY\n");
273 break;
274
275 default:
276 /* If you implement a new node type you should also implement
277 summary support for it or disable summary.
278 */
279 BUG();
280 break;
281 }
282
283 return 0;
284
285no_mem:
286 JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
287 return -ENOMEM;
288}
289
290
291/* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
292
293static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
294 struct jffs2_summary_node *summary, uint32_t *pseudo_random)
295{
296 struct jffs2_raw_node_ref *raw;
297 struct jffs2_inode_cache *ic;
298 struct jffs2_full_dirent *fd;
299 void *sp;
300 int i, ino;
301
302 sp = summary->sum;
303
304 for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
305 JFFS2_DBG_SUMMARY("processing summary index %d\n", i);
306
307 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
308 case JFFS2_NODETYPE_INODE: {
309 struct jffs2_sum_inode_flash *spi;
310 spi = sp;
311
312 ino = je32_to_cpu(spi->inode);
313
314 JFFS2_DBG_SUMMARY("Inode at 0x%08x\n",
315 jeb->offset + je32_to_cpu(spi->offset));
316
317 raw = jffs2_alloc_raw_node_ref();
318 if (!raw) {
319 JFFS2_NOTICE("allocation of node reference failed\n");
320 kfree(summary);
321 return -ENOMEM;
322 }
323
324 ic = jffs2_scan_make_ino_cache(c, ino);
325 if (!ic) {
326 JFFS2_NOTICE("scan_make_ino_cache failed\n");
327 jffs2_free_raw_node_ref(raw);
328 kfree(summary);
329 return -ENOMEM;
330 }
331
332 raw->flash_offset = (jeb->offset + je32_to_cpu(spi->offset)) | REF_UNCHECKED;
333 raw->__totlen = PAD(je32_to_cpu(spi->totlen));
334 raw->next_phys = NULL;
335 raw->next_in_ino = ic->nodes;
336
337 ic->nodes = raw;
338 if (!jeb->first_node)
339 jeb->first_node = raw;
340 if (jeb->last_node)
341 jeb->last_node->next_phys = raw;
342 jeb->last_node = raw;
343 *pseudo_random += je32_to_cpu(spi->version);
344
345 UNCHECKED_SPACE(PAD(je32_to_cpu(spi->totlen)));
346
347 sp += JFFS2_SUMMARY_INODE_SIZE;
348
349 break;
350 }
351
352 case JFFS2_NODETYPE_DIRENT: {
353 struct jffs2_sum_dirent_flash *spd;
354 spd = sp;
355
356 JFFS2_DBG_SUMMARY("Dirent at 0x%08x\n",
357 jeb->offset + je32_to_cpu(spd->offset));
358
359 fd = jffs2_alloc_full_dirent(spd->nsize+1);
360 if (!fd) {
361 kfree(summary);
362 return -ENOMEM;
363 }
364
365 memcpy(&fd->name, spd->name, spd->nsize);
366 fd->name[spd->nsize] = 0;
367
368 raw = jffs2_alloc_raw_node_ref();
369 if (!raw) {
370 jffs2_free_full_dirent(fd);
371 JFFS2_NOTICE("allocation of node reference failed\n");
372 kfree(summary);
373 return -ENOMEM;
374 }
375
376 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
377 if (!ic) {
378 jffs2_free_full_dirent(fd);
379 jffs2_free_raw_node_ref(raw);
380 kfree(summary);
381 return -ENOMEM;
382 }
383
384 raw->__totlen = PAD(je32_to_cpu(spd->totlen));
385 raw->flash_offset = (jeb->offset + je32_to_cpu(spd->offset)) | REF_PRISTINE;
386 raw->next_phys = NULL;
387 raw->next_in_ino = ic->nodes;
388 ic->nodes = raw;
389 if (!jeb->first_node)
390 jeb->first_node = raw;
391 if (jeb->last_node)
392 jeb->last_node->next_phys = raw;
393 jeb->last_node = raw;
394
395 fd->raw = raw;
396 fd->next = NULL;
397 fd->version = je32_to_cpu(spd->version);
398 fd->ino = je32_to_cpu(spd->ino);
399 fd->nhash = full_name_hash(fd->name, spd->nsize);
400 fd->type = spd->type;
401 USED_SPACE(PAD(je32_to_cpu(spd->totlen)));
402 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
403
404 *pseudo_random += je32_to_cpu(spd->version);
405
406 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
407
408 break;
409 }
410
411 default : {
412 JFFS2_WARNING("Unsupported node type found in summary! Exiting...");
413 kfree(summary);
414 return -EIO;
415 }
416 }
417 }
418
419 kfree(summary);
420 return 0;
421}
422
423/* Process the summary node - called from jffs2_scan_eraseblock() */
424
425int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
426 uint32_t ofs, uint32_t *pseudo_random)
427{
428 struct jffs2_unknown_node crcnode;
429 struct jffs2_raw_node_ref *cache_ref;
430 struct jffs2_summary_node *summary;
431 int ret, sumsize;
432 uint32_t crc;
433
434 sumsize = c->sector_size - ofs;
435 ofs += jeb->offset;
436
437 JFFS2_DBG_SUMMARY("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
438 jeb->offset, ofs, sumsize);
439
440 summary = kmalloc(sumsize, GFP_KERNEL);
441
442 if (!summary) {
443 return -ENOMEM;
444 }
445
446 ret = jffs2_fill_scan_buf(c, (unsigned char *)summary, ofs, sumsize);
447
448 if (ret) {
449 kfree(summary);
450 return ret;
451 }
452
453 /* OK, now check for node validity and CRC */
454 crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
455 crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
456 crcnode.totlen = summary->totlen;
457 crc = crc32(0, &crcnode, sizeof(crcnode)-4);
458
459 if (je32_to_cpu(summary->hdr_crc) != crc) {
460 JFFS2_DBG_SUMMARY("Summary node header is corrupt (bad CRC or "
461 "no summary at all)\n");
462 goto crc_err;
463 }
464
465 if (je32_to_cpu(summary->totlen) != sumsize) {
466 JFFS2_DBG_SUMMARY("Summary node is corrupt (wrong erasesize?)\n");
467 goto crc_err;
468 }
469
470 crc = crc32(0, summary, sizeof(struct jffs2_summary_node)-8);
471
472 if (je32_to_cpu(summary->node_crc) != crc) {
473 JFFS2_DBG_SUMMARY("Summary node is corrupt (bad CRC)\n");
474 goto crc_err;
475 }
476
477 crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_summary_node));
478
479 if (je32_to_cpu(summary->sum_crc) != crc) {
480 JFFS2_DBG_SUMMARY("Summary node data is corrupt (bad CRC)\n");
481 goto crc_err;
482 }
483
484 if ( je32_to_cpu(summary->cln_mkr) ) {
485
486 JFFS2_DBG_SUMMARY("Summary : CLEANMARKER node \n");
487
488 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
489 JFFS2_DBG_SUMMARY("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
490 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
491 UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr)));
492 } else if (jeb->first_node) {
493 JFFS2_DBG_SUMMARY("CLEANMARKER node not first node in block "
494 "(0x%08x)\n", jeb->offset);
495 UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr)));
496 } else {
497 struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref();
498
499 if (!marker_ref) {
500 JFFS2_NOTICE("Failed to allocate node ref for clean marker\n");
501 kfree(summary);
502 return -ENOMEM;
503 }
504
505 marker_ref->next_in_ino = NULL;
506 marker_ref->next_phys = NULL;
507 marker_ref->flash_offset = jeb->offset | REF_NORMAL;
508 marker_ref->__totlen = je32_to_cpu(summary->cln_mkr);
509 jeb->first_node = jeb->last_node = marker_ref;
510
511 USED_SPACE( PAD(je32_to_cpu(summary->cln_mkr)) );
512 }
513 }
514
515 if (je32_to_cpu(summary->padded)) {
516 DIRTY_SPACE(je32_to_cpu(summary->padded));
517 }
518
519 ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
520 if (ret)
521 return ret;
522
523 /* for PARANOIA_CHECK */
524 cache_ref = jffs2_alloc_raw_node_ref();
525
526 if (!cache_ref) {
527 JFFS2_NOTICE("Failed to allocate node ref for cache\n");
528 return -ENOMEM;
529 }
530
531 cache_ref->next_in_ino = NULL;
532 cache_ref->next_phys = NULL;
533 cache_ref->flash_offset = ofs | REF_NORMAL;
534 cache_ref->__totlen = sumsize;
535
536 if (!jeb->first_node)
537 jeb->first_node = cache_ref;
538 if (jeb->last_node)
539 jeb->last_node->next_phys = cache_ref;
540 jeb->last_node = cache_ref;
541
542 USED_SPACE(sumsize);
543
544 jeb->wasted_size += jeb->free_size;
545 c->wasted_size += jeb->free_size;
546 c->free_size -= jeb->free_size;
547 jeb->free_size = 0;
548
549 return jffs2_scan_classify_jeb(c, jeb);
550
551crc_err:
552 JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
553
554 return 0;
555}
556
557/* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
558
559static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
560 uint32_t infosize, uint32_t datasize, int padsize)
561{
562 struct jffs2_summary_node isum;
563 union jffs2_sum_mem *temp;
564 struct jffs2_sum_marker *sm;
565 struct kvec vecs[2];
566 void *wpage;
567 int ret;
568 size_t retlen;
569
570 memset(c->summary->sum_buf, 0xff, datasize);
571 memset(&isum, 0, sizeof(isum));
572
573 isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
574 isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
575 isum.totlen = cpu_to_je32(infosize);
576 isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
577 isum.padded = cpu_to_je32(c->summary->sum_padded);
578 isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
579 isum.sum_num = cpu_to_je32(c->summary->sum_num);
580 wpage = c->summary->sum_buf;
581
582 while (c->summary->sum_num) {
583
584 switch (je16_to_cpu(c->summary->sum_list_head->u.nodetype)) {
585 case JFFS2_NODETYPE_INODE: {
586 struct jffs2_sum_inode_flash *sino_ptr = wpage;
587
588 sino_ptr->nodetype = c->summary->sum_list_head->i.nodetype;
589 sino_ptr->inode = c->summary->sum_list_head->i.inode;
590 sino_ptr->version = c->summary->sum_list_head->i.version;
591 sino_ptr->offset = c->summary->sum_list_head->i.offset;
592 sino_ptr->totlen = c->summary->sum_list_head->i.totlen;
593
594 wpage += JFFS2_SUMMARY_INODE_SIZE;
595
596 break;
597 }
598
599 case JFFS2_NODETYPE_DIRENT: {
600 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
601
602 sdrnt_ptr->nodetype = c->summary->sum_list_head->d.nodetype;
603 sdrnt_ptr->totlen = c->summary->sum_list_head->d.totlen;
604 sdrnt_ptr->offset = c->summary->sum_list_head->d.offset;
605 sdrnt_ptr->pino = c->summary->sum_list_head->d.pino;
606 sdrnt_ptr->version = c->summary->sum_list_head->d.version;
607 sdrnt_ptr->ino = c->summary->sum_list_head->d.ino;
608 sdrnt_ptr->nsize = c->summary->sum_list_head->d.nsize;
609 sdrnt_ptr->type = c->summary->sum_list_head->d.type;
610
611 memcpy(sdrnt_ptr->name, c->summary->sum_list_head->d.name,
612 c->summary->sum_list_head->d.nsize);
613
614 wpage += JFFS2_SUMMARY_DIRENT_SIZE(c->summary->sum_list_head->d.nsize);
615
616 break;
617 }
618
619 default : {
620 BUG(); /* unknown node in summary information */
621 }
622 }
623
624 temp = c->summary->sum_list_head;
625 c->summary->sum_list_head = c->summary->sum_list_head->u.next;
626 kfree(temp);
627
628 c->summary->sum_num--;
629 }
630
631 jffs2_sum_reset_collected(c->summary);
632
633 wpage += padsize;
634
635 sm = wpage;
636 sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
637 sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
638
639 isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
640 isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
641
642 vecs[0].iov_base = &isum;
643 vecs[0].iov_len = sizeof(isum);
644 vecs[1].iov_base = c->summary->sum_buf;
645 vecs[1].iov_len = datasize;
646
647 JFFS2_DBG_SUMMARY("JFFS2: writing out data to flash to pos : 0x%08x\n",
648 jeb->offset + c->sector_size - jeb->free_size);
649
650 spin_unlock(&c->erase_completion_lock);
651 ret = jffs2_flash_writev(c, vecs, 2, jeb->offset + c->sector_size -
652 jeb->free_size, &retlen, 0);
653 spin_lock(&c->erase_completion_lock);
654
655
656 if (ret || (retlen != infosize)) {
657 JFFS2_WARNING("Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n",
658 infosize, jeb->offset + c->sector_size - jeb->free_size, ret, retlen);
659
660 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
661 WASTED_SPACE(infosize);
662
663 return 1;
664 }
665
666 return 0;
667}
668
669/* Write out summary information - called from jffs2_do_reserve_space */
670
671int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
672{
673 struct jffs2_raw_node_ref *summary_ref;
674 int datasize, infosize, padsize, ret;
675 struct jffs2_eraseblock *jeb;
676
677 JFFS2_DBG_SUMMARY("called\n");
678
679 jeb = c->nextblock;
680
681 if (!c->summary->sum_num || !c->summary->sum_list_head) {
682 JFFS2_WARNING("Empty summary info!!!\n");
683 BUG();
684 }
685
686 datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
687 infosize = sizeof(struct jffs2_summary_node) + datasize;
688 padsize = jeb->free_size - infosize;
689 infosize += padsize;
690 datasize += padsize;
691
692 /* Is there enough space for summary? */
693 if (padsize < 0) {
694 /* don't try to write out summary for this jeb */
695 jffs2_sum_disable_collecting(c->summary);
696
697 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
698 return 0;
699 }
700
701 ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
702 if (ret)
703 return 0; /* can't write out summary, block is marked as NOSUM_SIZE */
704
705 /* for ACCT_PARANOIA_CHECK */
706 spin_unlock(&c->erase_completion_lock);
707 summary_ref = jffs2_alloc_raw_node_ref();
708 spin_lock(&c->erase_completion_lock);
709
710 if (!summary_ref) {
711 JFFS2_NOTICE("Failed to allocate node ref for summary\n");
712 return -ENOMEM;
713 }
714
715 summary_ref->next_in_ino = NULL;
716 summary_ref->next_phys = NULL;
717 summary_ref->flash_offset = (jeb->offset + c->sector_size - jeb->free_size) | REF_NORMAL;
718 summary_ref->__totlen = infosize;
719
720 if (!jeb->first_node)
721 jeb->first_node = summary_ref;
722 if (jeb->last_node)
723 jeb->last_node->next_phys = summary_ref;
724 jeb->last_node = summary_ref;
725
726 USED_SPACE(infosize);
727
728 return 0;
729}
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-29 01:28:16 -0400