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paravirt: clean up lazy mode handling
[linux-2.6/mini2440.git] / fs / jffs2 / summary.c
blobd828b296392a00ae500c841596d7e8dda79b8670
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 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 * 2006 KaiGai Kohei <kaigai@ak.jp.nec.com>
9 *
10 * For licensing information, see the file 'LICENCE' in this directory.
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 jffs2_summary), GFP_KERNEL);
27
28 if (!c->summary) {
29 JFFS2_WARNING("Can't allocate memory for summary information!\n");
30 return -ENOMEM;
31 }
32
33 c->summary->sum_buf = vmalloc(c->sector_size);
34
35 if (!c->summary->sum_buf) {
36 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
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->summary);
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_summary *s, union jffs2_sum_mem *item)
60 {
61 if (!s->sum_list_head)
62 s->sum_list_head = (union jffs2_sum_mem *) item;
63 if (s->sum_list_tail)
64 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
65 s->sum_list_tail = (union jffs2_sum_mem *) item;
66
67 switch (je16_to_cpu(item->u.nodetype)) {
68 case JFFS2_NODETYPE_INODE:
69 s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
70 s->sum_num++;
71 dbg_summary("inode (%u) added to summary\n",
72 je32_to_cpu(item->i.inode));
73 break;
74 case JFFS2_NODETYPE_DIRENT:
75 s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
76 s->sum_num++;
77 dbg_summary("dirent (%u) added to summary\n",
78 je32_to_cpu(item->d.ino));
79 break;
80 #ifdef CONFIG_JFFS2_FS_XATTR
81 case JFFS2_NODETYPE_XATTR:
82 s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
83 s->sum_num++;
84 dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
85 je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
86 break;
87 case JFFS2_NODETYPE_XREF:
88 s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
89 s->sum_num++;
90 dbg_summary("xref added to summary\n");
91 break;
92 #endif
93 default:
94 JFFS2_WARNING("UNKNOWN node type %u\n",
95 je16_to_cpu(item->u.nodetype));
96 return 1;
97 }
98 return 0;
99 }
100
101
102 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
103
104 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
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_summary *s, struct jffs2_raw_inode *ri,
112 uint32_t ofs)
113 {
114 struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
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); /* relative offset from the begining of the jeb */
123 temp->totlen = ri->totlen;
124 temp->next = NULL;
125
126 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
127 }
128
129 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
130 uint32_t ofs)
131 {
132 struct jffs2_sum_dirent_mem *temp =
133 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
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); /* relative from the begining of the jeb */
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 jffs2_sum_mem *)temp);
151 }
152
153 #ifdef CONFIG_JFFS2_FS_XATTR
154 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
155 {
156 struct jffs2_sum_xattr_mem *temp;
157
158 temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
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 jffs2_sum_mem *)temp);
170 }
171
172 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
173 {
174 struct jffs2_sum_xref_mem *temp;
175
176 temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
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 jffs2_sum_mem *)temp);
185 }
186 #endif
187 /* Cleanup every collected summary information */
188
189 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
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_head->u.next;
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_summary *s)
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_summary *s)
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 *s)
221 {
222 return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
223 }
224
225 /* Move the collected summary information into sb (called from scan.c) */
226
227 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
228 {
229 dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
230 c->summary->sum_size, c->summary->sum_num,
231 s->sum_size, s->sum_num);
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_list_head;
237 c->summary->sum_list_tail = s->sum_list_tail;
238
239 s->sum_list_head = s->sum_list_tail = NULL;
240 }
241
242 /* Called from wbuf.c to collect writed node info */
243
244 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
245 unsigned long count, uint32_t ofs)
246 {
247 union jffs2_node_union *node;
248 struct jffs2_eraseblock *jeb;
249
250 if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) {
251 dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n");
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_mem *temp =
262 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
263
264 if (!temp)
265 goto no_mem;
266
267 temp->nodetype = node->i.nodetype;
268 temp->inode = node->i.ino;
269 temp->version = node->i.version;
270 temp->offset = cpu_to_je32(ofs);
271 temp->totlen = node->i.totlen;
272 temp->next = NULL;
273
274 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
275 }
276
277 case JFFS2_NODETYPE_DIRENT: {
278 struct jffs2_sum_dirent_mem *temp =
279 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
280
281 if (!temp)
282 goto no_mem;
283
284 temp->nodetype = node->d.nodetype;
285 temp->totlen = node->d.totlen;
286 temp->offset = cpu_to_je32(ofs);
287 temp->pino = node->d.pino;
288 temp->version = node->d.version;
289 temp->ino = node->d.ino;
290 temp->nsize = node->d.nsize;
291 temp->type = node->d.type;
292 temp->next = NULL;
293
294 switch (count) {
295 case 1:
296 memcpy(temp->name,node->d.name,node->d.nsize);
297 break;
298
299 case 2:
300 memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
301 break;
302
303 default:
304 BUG(); /* impossible count value */
305 break;
306 }
307
308 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
309 }
310 #ifdef CONFIG_JFFS2_FS_XATTR
311 case JFFS2_NODETYPE_XATTR: {
312 struct jffs2_sum_xattr_mem *temp;
313 temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
314 if (!temp)
315 goto no_mem;
316
317 temp->nodetype = node->x.nodetype;
318 temp->xid = node->x.xid;
319 temp->version = node->x.version;
320 temp->totlen = node->x.totlen;
321 temp->offset = cpu_to_je32(ofs);
322 temp->next = NULL;
323
324 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
325 }
326 case JFFS2_NODETYPE_XREF: {
327 struct jffs2_sum_xref_mem *temp;
328 temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
329 if (!temp)
330 goto no_mem;
331 temp->nodetype = node->r.nodetype;
332 temp->offset = cpu_to_je32(ofs);
333 temp->next = NULL;
334
335 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
336 }
337 #endif
338 case JFFS2_NODETYPE_PADDING:
339 dbg_summary("node PADDING\n");
340 c->summary->sum_padded += je32_to_cpu(node->u.totlen);
341 break;
342
343 case JFFS2_NODETYPE_CLEANMARKER:
344 dbg_summary("node CLEANMARKER\n");
345 break;
346
347 case JFFS2_NODETYPE_SUMMARY:
348 dbg_summary("node SUMMARY\n");
349 break;
350
351 default:
352 /* If you implement a new node type you should also implement
353 summary support for it or disable summary.
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_node_ref(struct jffs2_sb_info *c,
367 struct jffs2_eraseblock *jeb,
368 uint32_t ofs, uint32_t len,
369 struct jffs2_inode_cache *ic)
370 {
371 /* If there was a gap, mark it dirty */
372 if ((ofs & ~3) > c->sector_size - jeb->free_size) {
373 /* Ew. Summary doesn't actually tell us explicitly about dirty space */
374 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
375 }
376
377 return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
378 }
379
380 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
381
382 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
383 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
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_num); i++) {
394 dbg_summary("processing summary index %d\n", i);
395
396 cond_resched();
397
398 /* Make sure there's a spare ref for dirty space */
399 err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
400 if (err)
401 return err;
402
403 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
404 case JFFS2_NODETYPE_INODE: {
405 struct jffs2_sum_inode_flash *spi;
406 spi = sp;
407
408 ino = je32_to_cpu(spi->inode);
409
410 dbg_summary("Inode at 0x%08x-0x%08x\n",
411 jeb->offset + je32_to_cpu(spi->offset),
412 jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
413
414 ic = jffs2_scan_make_ino_cache(c, ino);
415 if (!ic) {
416 JFFS2_NOTICE("scan_make_ino_cache failed\n");
417 return -ENOMEM;
418 }
419
420 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
421 PAD(je32_to_cpu(spi->totlen)), ic);
422
423 *pseudo_random += je32_to_cpu(spi->version);
424
425 sp += JFFS2_SUMMARY_INODE_SIZE;
426
427 break;
428 }
429
430 case JFFS2_NODETYPE_DIRENT: {
431 struct jffs2_sum_dirent_flash *spd;
432 spd = sp;
433
434 dbg_summary("Dirent at 0x%08x-0x%08x\n",
435 jeb->offset + je32_to_cpu(spd->offset),
436 jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
437
438
439 fd = jffs2_alloc_full_dirent(spd->nsize+1);
440 if (!fd)
441 return -ENOMEM;
442
443 memcpy(&fd->name, spd->name, spd->nsize);
444 fd->name[spd->nsize] = 0;
445
446 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
447 if (!ic) {
448 jffs2_free_full_dirent(fd);
449 return -ENOMEM;
450 }
451
452 fd->raw = sum_link_node_ref(c, jeb, je32_to_cpu(spd->offset) | REF_UNCHECKED,
453 PAD(je32_to_cpu(spd->totlen)), ic);
454
455 fd->next = NULL;
456 fd->version = je32_to_cpu(spd->version);
457 fd->ino = je32_to_cpu(spd->ino);
458 fd->nhash = full_name_hash(fd->name, spd->nsize);
459 fd->type = spd->type;
460
461 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
462
463 *pseudo_random += je32_to_cpu(spd->version);
464
465 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
466
467 break;
468 }
469 #ifdef CONFIG_JFFS2_FS_XATTR
470 case JFFS2_NODETYPE_XATTR: {
471 struct jffs2_xattr_datum *xd;
472 struct jffs2_sum_xattr_flash *spx;
473
474 spx = (struct jffs2_sum_xattr_flash *)sp;
475 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n",
476 jeb->offset + je32_to_cpu(spx->offset),
477 jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
478 je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
479
480 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
481 je32_to_cpu(spx->version));
482 if (IS_ERR(xd))
483 return PTR_ERR(xd);
484 if (xd->version > je32_to_cpu(spx->version)) {
485 /* node is not the newest one */
486 struct jffs2_raw_node_ref *raw
487 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
488 PAD(je32_to_cpu(spx->totlen)), NULL);
489 raw->next_in_ino = xd->node->next_in_ino;
490 xd->node->next_in_ino = raw;
491 } else {
492 xd->version = je32_to_cpu(spx->version);
493 sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
494 PAD(je32_to_cpu(spx->totlen)), (void *)xd);
495 }
496 *pseudo_random += je32_to_cpu(spx->xid);
497 sp += JFFS2_SUMMARY_XATTR_SIZE;
498
499 break;
500 }
501 case JFFS2_NODETYPE_XREF: {
502 struct jffs2_xattr_ref *ref;
503 struct jffs2_sum_xref_flash *spr;
504
505 spr = (struct jffs2_sum_xref_flash *)sp;
506 dbg_summary("xref at %#08x-%#08x\n",
507 jeb->offset + je32_to_cpu(spr->offset),
508 jeb->offset + je32_to_cpu(spr->offset) +
509 (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
510
511 ref = jffs2_alloc_xattr_ref();
512 if (!ref) {
513 JFFS2_NOTICE("allocation of xattr_datum failed\n");
514 return -ENOMEM;
515 }
516 ref->next = c->xref_temp;
517 c->xref_temp = ref;
518
519 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
520 PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
521
522 *pseudo_random += ref->node->flash_offset;
523 sp += JFFS2_SUMMARY_XREF_SIZE;
524
525 break;
526 }
527 #endif
528 default : {
529 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
530 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
531 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
532 return -EIO;
533
534 /* For compatible node types, just fall back to the full scan */
535 c->wasted_size -= jeb->wasted_size;
536 c->free_size += c->sector_size - jeb->free_size;
537 c->used_size -= jeb->used_size;
538 c->dirty_size -= jeb->dirty_size;
539 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
540 jeb->free_size = c->sector_size;
541
542 jffs2_free_jeb_node_refs(c, jeb);
543 return -ENOTRECOVERABLE;
544 }
545 }
546 }
547 return 0;
548 }
549
550 /* Process the summary node - called from jffs2_scan_eraseblock() */
551 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
552 struct jffs2_raw_summary *summary, uint32_t sumsize,
553 uint32_t *pseudo_random)
554 {
555 struct jffs2_unknown_node crcnode;
556 int ret, ofs;
557 uint32_t crc;
558
559 ofs = c->sector_size - sumsize;
560
561 dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
562 jeb->offset, jeb->offset + ofs, sumsize);
563
564 /* OK, now check for node validity and CRC */
565 crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
566 crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
567 crcnode.totlen = summary->totlen;
568 crc = crc32(0, &crcnode, sizeof(crcnode)-4);
569
570 if (je32_to_cpu(summary->hdr_crc) != crc) {
571 dbg_summary("Summary node header is corrupt (bad CRC or "
572 "no summary at all)\n");
573 goto crc_err;
574 }
575
576 if (je32_to_cpu(summary->totlen) != sumsize) {
577 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
578 goto crc_err;
579 }
580
581 crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
582
583 if (je32_to_cpu(summary->node_crc) != crc) {
584 dbg_summary("Summary node is corrupt (bad CRC)\n");
585 goto crc_err;
586 }
587
588 crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
589
590 if (je32_to_cpu(summary->sum_crc) != crc) {
591 dbg_summary("Summary node data is corrupt (bad CRC)\n");
592 goto crc_err;
593 }
594
595 if ( je32_to_cpu(summary->cln_mkr) ) {
596
597 dbg_summary("Summary : CLEANMARKER node \n");
598
599 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
600 if (ret)
601 return ret;
602
603 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
604 dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
605 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
606 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
607 return ret;
608 } else if (jeb->first_node) {
609 dbg_summary("CLEANMARKER node not first node in block "
610 "(0x%08x)\n", jeb->offset);
611 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
612 return ret;
613 } else {
614 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
615 je32_to_cpu(summary->cln_mkr), NULL);
616 }
617 }
618
619 ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
620 /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
621 scan of this eraseblock. So return zero */
622 if (ret == -ENOTRECOVERABLE)
623 return 0;
624 if (ret)
625 return ret; /* real error */
626
627 /* for PARANOIA_CHECK */
628 ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
629 if (ret)
630 return ret;
631
632 sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
633
634 if (unlikely(jeb->free_size)) {
635 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
636 jeb->free_size, jeb->offset);
637 jeb->wasted_size += jeb->free_size;
638 c->wasted_size += jeb->free_size;
639 c->free_size -= jeb->free_size;
640 jeb->free_size = 0;
641 }
642
643 return jffs2_scan_classify_jeb(c, jeb);
644
645 crc_err:
646 JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
647
648 return 0;
649 }
650
651 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
652
653 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
654 uint32_t infosize, uint32_t datasize, int padsize)
655 {
656 struct jffs2_raw_summary isum;
657 union jffs2_sum_mem *temp;
658 struct jffs2_sum_marker *sm;
659 struct kvec vecs[2];
660 uint32_t sum_ofs;
661 void *wpage;
662 int ret;
663 size_t retlen;
664
665 memset(c->summary->sum_buf, 0xff, datasize);
666 memset(&isum, 0, sizeof(isum));
667
668 isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
669 isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
670 isum.totlen = cpu_to_je32(infosize);
671 isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
672 isum.padded = cpu_to_je32(c->summary->sum_padded);
673 isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
674 isum.sum_num = cpu_to_je32(c->summary->sum_num);
675 wpage = c->summary->sum_buf;
676
677 while (c->summary->sum_num) {
678 temp = c->summary->sum_list_head;
679
680 switch (je16_to_cpu(temp->u.nodetype)) {
681 case JFFS2_NODETYPE_INODE: {
682 struct jffs2_sum_inode_flash *sino_ptr = wpage;
683
684 sino_ptr->nodetype = temp->i.nodetype;
685 sino_ptr->inode = temp->i.inode;
686 sino_ptr->version = temp->i.version;
687 sino_ptr->offset = temp->i.offset;
688 sino_ptr->totlen = temp->i.totlen;
689
690 wpage += JFFS2_SUMMARY_INODE_SIZE;
691
692 break;
693 }
694
695 case JFFS2_NODETYPE_DIRENT: {
696 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
697
698 sdrnt_ptr->nodetype = temp->d.nodetype;
699 sdrnt_ptr->totlen = temp->d.totlen;
700 sdrnt_ptr->offset = temp->d.offset;
701 sdrnt_ptr->pino = temp->d.pino;
702 sdrnt_ptr->version = temp->d.version;
703 sdrnt_ptr->ino = temp->d.ino;
704 sdrnt_ptr->nsize = temp->d.nsize;
705 sdrnt_ptr->type = temp->d.type;
706
707 memcpy(sdrnt_ptr->name, temp->d.name,
708 temp->d.nsize);
709
710 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
711
712 break;
713 }
714 #ifdef CONFIG_JFFS2_FS_XATTR
715 case JFFS2_NODETYPE_XATTR: {
716 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
717
718 temp = c->summary->sum_list_head;
719 sxattr_ptr->nodetype = temp->x.nodetype;
720 sxattr_ptr->xid = temp->x.xid;
721 sxattr_ptr->version = temp->x.version;
722 sxattr_ptr->offset = temp->x.offset;
723 sxattr_ptr->totlen = temp->x.totlen;
724
725 wpage += JFFS2_SUMMARY_XATTR_SIZE;
726 break;
727 }
728 case JFFS2_NODETYPE_XREF: {
729 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
730
731 temp = c->summary->sum_list_head;
732 sxref_ptr->nodetype = temp->r.nodetype;
733 sxref_ptr->offset = temp->r.offset;
734
735 wpage += JFFS2_SUMMARY_XREF_SIZE;
736 break;
737 }
738 #endif
739 default : {
740 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
741 == JFFS2_FEATURE_RWCOMPAT_COPY) {
742 dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
743 je16_to_cpu(temp->u.nodetype));
744 jffs2_sum_disable_collecting(c->summary);
745 } else {
746 BUG(); /* unknown node in summary information */
747 }
748 }
749 }
750
751 c->summary->sum_list_head = temp->u.next;
752 kfree(temp);
753
754 c->summary->sum_num--;
755 }
756
757 jffs2_sum_reset_collected(c->summary);
758
759 wpage += padsize;
760
761 sm = wpage;
762 sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
763 sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
764
765 isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
766 isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
767
768 vecs[0].iov_base = &isum;
769 vecs[0].iov_len = sizeof(isum);
770 vecs[1].iov_base = c->summary->sum_buf;
771 vecs[1].iov_len = datasize;
772
773 sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
774
775 dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
776 sum_ofs);
777
778 ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
779
780 if (ret || (retlen != infosize)) {
781
782 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
783 infosize, sum_ofs, ret, retlen);
784
785 if (retlen) {
786 /* Waste remaining space */
787 spin_lock(&c->erase_completion_lock);
788 jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
789 spin_unlock(&c->erase_completion_lock);
790 }
791
792 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
793
794 return 0;
795 }
796
797 spin_lock(&c->erase_completion_lock);
798 jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
799 spin_unlock(&c->erase_completion_lock);
800
801 return 0;
802 }
803
804 /* Write out summary information - called from jffs2_do_reserve_space */
805
806 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
807 {
808 int datasize, infosize, padsize;
809 struct jffs2_eraseblock *jeb;
810 int ret;
811
812 dbg_summary("called\n");
813
814 spin_unlock(&c->erase_completion_lock);
815
816 jeb = c->nextblock;
817 jffs2_prealloc_raw_node_refs(c, jeb, 1);
818
819 if (!c->summary->sum_num || !c->summary->sum_list_head) {
820 JFFS2_WARNING("Empty summary info!!!\n");
821 BUG();
822 }
823
824 datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
825 infosize = sizeof(struct jffs2_raw_summary) + datasize;
826 padsize = jeb->free_size - infosize;
827 infosize += padsize;
828 datasize += padsize;
829
830 /* Is there enough space for summary? */
831 if (padsize < 0) {
832 /* don't try to write out summary for this jeb */
833 jffs2_sum_disable_collecting(c->summary);
834
835 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
836 spin_lock(&c->erase_completion_lock);
837 return 0;
838 }
839
840 ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
841 spin_lock(&c->erase_completion_lock);
842 return ret;
843 }
Support for the Chinese Samsung S3C2440 based development boards