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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / fs / jffs2 / summary.c
blobe537fb0e0184e97eae8907a97c34d46920d9f129
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 uint32_t sum_size = min_t(uint32_t, c->sector_size, MAX_SUMMARY_SIZE);
27
28 c->summary = kzalloc(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 c->summary->sum_buf = kmalloc(sum_size, GFP_KERNEL);
36
37 if (!c->summary->sum_buf) {
38 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
39 kfree(c->summary);
40 return -ENOMEM;
41 }
42
43 dbg_summary("returned successfully\n");
44
45 return 0;
46 }
47
48 void jffs2_sum_exit(struct jffs2_sb_info *c)
49 {
50 dbg_summary("called\n");
51
52 jffs2_sum_disable_collecting(c->summary);
53
54 kfree(c->summary->sum_buf);
55 c->summary->sum_buf = NULL;
56
57 kfree(c->summary);
58 c->summary = NULL;
59 }
60
61 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
62 {
63 if (!s->sum_list_head)
64 s->sum_list_head = (union jffs2_sum_mem *) item;
65 if (s->sum_list_tail)
66 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
67 s->sum_list_tail = (union jffs2_sum_mem *) item;
68
69 switch (je16_to_cpu(item->u.nodetype)) {
70 case JFFS2_NODETYPE_INODE:
71 s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
72 s->sum_num++;
73 dbg_summary("inode (%u) added to summary\n",
74 je32_to_cpu(item->i.inode));
75 break;
76 case JFFS2_NODETYPE_DIRENT:
77 s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
78 s->sum_num++;
79 dbg_summary("dirent (%u) added to summary\n",
80 je32_to_cpu(item->d.ino));
81 break;
82 #ifdef CONFIG_JFFS2_FS_XATTR
83 case JFFS2_NODETYPE_XATTR:
84 s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
85 s->sum_num++;
86 dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
87 je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
88 break;
89 case JFFS2_NODETYPE_XREF:
90 s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
91 s->sum_num++;
92 dbg_summary("xref added to summary\n");
93 break;
94 #endif
95 default:
96 JFFS2_WARNING("UNKNOWN node type %u\n",
97 je16_to_cpu(item->u.nodetype));
98 return 1;
99 }
100 return 0;
101 }
102
103
104 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
105
106 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
107 {
108 dbg_summary("called with %u\n", size);
109 s->sum_padded += size;
110 return 0;
111 }
112
113 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
114 uint32_t ofs)
115 {
116 struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
117
118 if (!temp)
119 return -ENOMEM;
120
121 temp->nodetype = ri->nodetype;
122 temp->inode = ri->ino;
123 temp->version = ri->version;
124 temp->offset = cpu_to_je32(ofs); /* relative offset from the beginning of the jeb */
125 temp->totlen = ri->totlen;
126 temp->next = NULL;
127
128 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
129 }
130
131 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
132 uint32_t ofs)
133 {
134 struct jffs2_sum_dirent_mem *temp =
135 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
136
137 if (!temp)
138 return -ENOMEM;
139
140 temp->nodetype = rd->nodetype;
141 temp->totlen = rd->totlen;
142 temp->offset = cpu_to_je32(ofs); /* relative from the beginning of the jeb */
143 temp->pino = rd->pino;
144 temp->version = rd->version;
145 temp->ino = rd->ino;
146 temp->nsize = rd->nsize;
147 temp->type = rd->type;
148 temp->next = NULL;
149
150 memcpy(temp->name, rd->name, rd->nsize);
151
152 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
153 }
154
155 #ifdef CONFIG_JFFS2_FS_XATTR
156 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
157 {
158 struct jffs2_sum_xattr_mem *temp;
159
160 temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
161 if (!temp)
162 return -ENOMEM;
163
164 temp->nodetype = rx->nodetype;
165 temp->xid = rx->xid;
166 temp->version = rx->version;
167 temp->offset = cpu_to_je32(ofs);
168 temp->totlen = rx->totlen;
169 temp->next = NULL;
170
171 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
172 }
173
174 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
175 {
176 struct jffs2_sum_xref_mem *temp;
177
178 temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
179 if (!temp)
180 return -ENOMEM;
181
182 temp->nodetype = rr->nodetype;
183 temp->offset = cpu_to_je32(ofs);
184 temp->next = NULL;
185
186 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
187 }
188 #endif
189 /* Cleanup every collected summary information */
190
191 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
192 {
193 union jffs2_sum_mem *temp;
194
195 if (!s->sum_list_head) {
196 dbg_summary("already empty\n");
197 }
198 while (s->sum_list_head) {
199 temp = s->sum_list_head;
200 s->sum_list_head = s->sum_list_head->u.next;
201 kfree(temp);
202 }
203 s->sum_list_tail = NULL;
204 s->sum_padded = 0;
205 s->sum_num = 0;
206 }
207
208 void jffs2_sum_reset_collected(struct jffs2_summary *s)
209 {
210 dbg_summary("called\n");
211 jffs2_sum_clean_collected(s);
212 s->sum_size = 0;
213 }
214
215 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
216 {
217 dbg_summary("called\n");
218 jffs2_sum_clean_collected(s);
219 s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
220 }
221
222 int jffs2_sum_is_disabled(struct jffs2_summary *s)
223 {
224 return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
225 }
226
227 /* Move the collected summary information into sb (called from scan.c) */
228
229 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
230 {
231 dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
232 c->summary->sum_size, c->summary->sum_num,
233 s->sum_size, s->sum_num);
234
235 c->summary->sum_size = s->sum_size;
236 c->summary->sum_num = s->sum_num;
237 c->summary->sum_padded = s->sum_padded;
238 c->summary->sum_list_head = s->sum_list_head;
239 c->summary->sum_list_tail = s->sum_list_tail;
240
241 s->sum_list_head = s->sum_list_tail = NULL;
242 }
243
244 /* Called from wbuf.c to collect writed node info */
245
246 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
247 unsigned long count, uint32_t ofs)
248 {
249 union jffs2_node_union *node;
250 struct jffs2_eraseblock *jeb;
251
252 if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) {
253 dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n");
254 return 0;
255 }
256
257 node = invecs[0].iov_base;
258 jeb = &c->blocks[ofs / c->sector_size];
259 ofs -= jeb->offset;
260
261 switch (je16_to_cpu(node->u.nodetype)) {
262 case JFFS2_NODETYPE_INODE: {
263 struct jffs2_sum_inode_mem *temp =
264 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
265
266 if (!temp)
267 goto no_mem;
268
269 temp->nodetype = node->i.nodetype;
270 temp->inode = node->i.ino;
271 temp->version = node->i.version;
272 temp->offset = cpu_to_je32(ofs);
273 temp->totlen = node->i.totlen;
274 temp->next = NULL;
275
276 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
277 }
278
279 case JFFS2_NODETYPE_DIRENT: {
280 struct jffs2_sum_dirent_mem *temp =
281 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
282
283 if (!temp)
284 goto no_mem;
285
286 temp->nodetype = node->d.nodetype;
287 temp->totlen = node->d.totlen;
288 temp->offset = cpu_to_je32(ofs);
289 temp->pino = node->d.pino;
290 temp->version = node->d.version;
291 temp->ino = node->d.ino;
292 temp->nsize = node->d.nsize;
293 temp->type = node->d.type;
294 temp->next = NULL;
295
296 switch (count) {
297 case 1:
298 memcpy(temp->name,node->d.name,node->d.nsize);
299 break;
300
301 case 2:
302 memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
303 break;
304
305 default:
306 BUG(); /* impossible count value */
307 break;
308 }
309
310 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
311 }
312 #ifdef CONFIG_JFFS2_FS_XATTR
313 case JFFS2_NODETYPE_XATTR: {
314 struct jffs2_sum_xattr_mem *temp;
315 temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
316 if (!temp)
317 goto no_mem;
318
319 temp->nodetype = node->x.nodetype;
320 temp->xid = node->x.xid;
321 temp->version = node->x.version;
322 temp->totlen = node->x.totlen;
323 temp->offset = cpu_to_je32(ofs);
324 temp->next = NULL;
325
326 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
327 }
328 case JFFS2_NODETYPE_XREF: {
329 struct jffs2_sum_xref_mem *temp;
330 temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
331 if (!temp)
332 goto no_mem;
333 temp->nodetype = node->r.nodetype;
334 temp->offset = cpu_to_je32(ofs);
335 temp->next = NULL;
336
337 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
338 }
339 #endif
340 case JFFS2_NODETYPE_PADDING:
341 dbg_summary("node PADDING\n");
342 c->summary->sum_padded += je32_to_cpu(node->u.totlen);
343 break;
344
345 case JFFS2_NODETYPE_CLEANMARKER:
346 dbg_summary("node CLEANMARKER\n");
347 break;
348
349 case JFFS2_NODETYPE_SUMMARY:
350 dbg_summary("node SUMMARY\n");
351 break;
352
353 default:
354 /* If you implement a new node type you should also implement
355 summary support for it or disable summary.
356 */
357 BUG();
358 break;
359 }
360
361 return 0;
362
363 no_mem:
364 JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
365 return -ENOMEM;
366 }
367
368 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
369 struct jffs2_eraseblock *jeb,
370 uint32_t ofs, uint32_t len,
371 struct jffs2_inode_cache *ic)
372 {
373 /* If there was a gap, mark it dirty */
374 if ((ofs & ~3) > c->sector_size - jeb->free_size) {
375 /* Ew. Summary doesn't actually tell us explicitly about dirty space */
376 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
377 }
378
379 return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
380 }
381
382 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
383
384 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
385 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
386 {
387 struct jffs2_inode_cache *ic;
388 struct jffs2_full_dirent *fd;
389 void *sp;
390 int i, ino;
391 int err;
392
393 sp = summary->sum;
394
395 for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
396 dbg_summary("processing summary index %d\n", i);
397
398 cond_resched();
399
400 /* Make sure there's a spare ref for dirty space */
401 err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
402 if (err)
403 return err;
404
405 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
406 case JFFS2_NODETYPE_INODE: {
407 struct jffs2_sum_inode_flash *spi;
408 spi = sp;
409
410 ino = je32_to_cpu(spi->inode);
411
412 dbg_summary("Inode at 0x%08x-0x%08x\n",
413 jeb->offset + je32_to_cpu(spi->offset),
414 jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
415
416 ic = jffs2_scan_make_ino_cache(c, ino);
417 if (!ic) {
418 JFFS2_NOTICE("scan_make_ino_cache failed\n");
419 return -ENOMEM;
420 }
421
422 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
423 PAD(je32_to_cpu(spi->totlen)), ic);
424
425 *pseudo_random += je32_to_cpu(spi->version);
426
427 sp += JFFS2_SUMMARY_INODE_SIZE;
428
429 break;
430 }
431
432 case JFFS2_NODETYPE_DIRENT: {
433 struct jffs2_sum_dirent_flash *spd;
434 int checkedlen;
435 spd = sp;
436
437 dbg_summary("Dirent at 0x%08x-0x%08x\n",
438 jeb->offset + je32_to_cpu(spd->offset),
439 jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
440
441
442 /* This should never happen, but https://dev.laptop.org/ticket/4184 */
443 checkedlen = strnlen(spd->name, spd->nsize);
444 if (!checkedlen) {
445 printk(KERN_ERR "Dirent at %08x has zero at start of name. Aborting mount.\n",
446 jeb->offset + je32_to_cpu(spd->offset));
447 return -EIO;
448 }
449 if (checkedlen < spd->nsize) {
450 printk(KERN_ERR "Dirent at %08x has zeroes in name. Truncating to %d chars\n",
451 jeb->offset + je32_to_cpu(spd->offset), checkedlen);
452 }
453
454
455 fd = jffs2_alloc_full_dirent(checkedlen+1);
456 if (!fd)
457 return -ENOMEM;
458
459 memcpy(&fd->name, spd->name, checkedlen);
460 fd->name[checkedlen] = 0;
461
462 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
463 if (!ic) {
464 jffs2_free_full_dirent(fd);
465 return -ENOMEM;
466 }
467
468 fd->raw = sum_link_node_ref(c, jeb, je32_to_cpu(spd->offset) | REF_UNCHECKED,
469 PAD(je32_to_cpu(spd->totlen)), ic);
470
471 fd->next = NULL;
472 fd->version = je32_to_cpu(spd->version);
473 fd->ino = je32_to_cpu(spd->ino);
474 fd->nhash = full_name_hash(fd->name, checkedlen);
475 fd->type = spd->type;
476
477 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
478
479 *pseudo_random += je32_to_cpu(spd->version);
480
481 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
482
483 break;
484 }
485 #ifdef CONFIG_JFFS2_FS_XATTR
486 case JFFS2_NODETYPE_XATTR: {
487 struct jffs2_xattr_datum *xd;
488 struct jffs2_sum_xattr_flash *spx;
489
490 spx = (struct jffs2_sum_xattr_flash *)sp;
491 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n",
492 jeb->offset + je32_to_cpu(spx->offset),
493 jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
494 je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
495
496 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
497 je32_to_cpu(spx->version));
498 if (IS_ERR(xd))
499 return PTR_ERR(xd);
500 if (xd->version > je32_to_cpu(spx->version)) {
501 /* node is not the newest one */
502 struct jffs2_raw_node_ref *raw
503 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
504 PAD(je32_to_cpu(spx->totlen)), NULL);
505 raw->next_in_ino = xd->node->next_in_ino;
506 xd->node->next_in_ino = raw;
507 } else {
508 xd->version = je32_to_cpu(spx->version);
509 sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
510 PAD(je32_to_cpu(spx->totlen)), (void *)xd);
511 }
512 *pseudo_random += je32_to_cpu(spx->xid);
513 sp += JFFS2_SUMMARY_XATTR_SIZE;
514
515 break;
516 }
517 case JFFS2_NODETYPE_XREF: {
518 struct jffs2_xattr_ref *ref;
519 struct jffs2_sum_xref_flash *spr;
520
521 spr = (struct jffs2_sum_xref_flash *)sp;
522 dbg_summary("xref at %#08x-%#08x\n",
523 jeb->offset + je32_to_cpu(spr->offset),
524 jeb->offset + je32_to_cpu(spr->offset) +
525 (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
526
527 ref = jffs2_alloc_xattr_ref();
528 if (!ref) {
529 JFFS2_NOTICE("allocation of xattr_datum failed\n");
530 return -ENOMEM;
531 }
532 ref->next = c->xref_temp;
533 c->xref_temp = ref;
534
535 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
536 PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
537
538 *pseudo_random += ref->node->flash_offset;
539 sp += JFFS2_SUMMARY_XREF_SIZE;
540
541 break;
542 }
543 #endif
544 default : {
545 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
546 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
547 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
548 return -EIO;
549
550 /* For compatible node types, just fall back to the full scan */
551 c->wasted_size -= jeb->wasted_size;
552 c->free_size += c->sector_size - jeb->free_size;
553 c->used_size -= jeb->used_size;
554 c->dirty_size -= jeb->dirty_size;
555 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
556 jeb->free_size = c->sector_size;
557
558 jffs2_free_jeb_node_refs(c, jeb);
559 return -ENOTRECOVERABLE;
560 }
561 }
562 }
563 return 0;
564 }
565
566 /* Process the summary node - called from jffs2_scan_eraseblock() */
567 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
568 struct jffs2_raw_summary *summary, uint32_t sumsize,
569 uint32_t *pseudo_random)
570 {
571 struct jffs2_unknown_node crcnode;
572 int ret, ofs;
573 uint32_t crc;
574
575 ofs = c->sector_size - sumsize;
576
577 dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
578 jeb->offset, jeb->offset + ofs, sumsize);
579
580 /* OK, now check for node validity and CRC */
581 crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
582 crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
583 crcnode.totlen = summary->totlen;
584 crc = crc32(0, &crcnode, sizeof(crcnode)-4);
585
586 if (je32_to_cpu(summary->hdr_crc) != crc) {
587 dbg_summary("Summary node header is corrupt (bad CRC or "
588 "no summary at all)\n");
589 goto crc_err;
590 }
591
592 if (je32_to_cpu(summary->totlen) != sumsize) {
593 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
594 goto crc_err;
595 }
596
597 crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
598
599 if (je32_to_cpu(summary->node_crc) != crc) {
600 dbg_summary("Summary node is corrupt (bad CRC)\n");
601 goto crc_err;
602 }
603
604 crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
605
606 if (je32_to_cpu(summary->sum_crc) != crc) {
607 dbg_summary("Summary node data is corrupt (bad CRC)\n");
608 goto crc_err;
609 }
610
611 if ( je32_to_cpu(summary->cln_mkr) ) {
612
613 dbg_summary("Summary : CLEANMARKER node \n");
614
615 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
616 if (ret)
617 return ret;
618
619 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
620 dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
621 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
622 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
623 return ret;
624 } else if (jeb->first_node) {
625 dbg_summary("CLEANMARKER node not first node in block "
626 "(0x%08x)\n", jeb->offset);
627 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
628 return ret;
629 } else {
630 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
631 je32_to_cpu(summary->cln_mkr), NULL);
632 }
633 }
634
635 ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
636 /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
637 scan of this eraseblock. So return zero */
638 if (ret == -ENOTRECOVERABLE)
639 return 0;
640 if (ret)
641 return ret; /* real error */
642
643 /* for PARANOIA_CHECK */
644 ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
645 if (ret)
646 return ret;
647
648 sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
649
650 if (unlikely(jeb->free_size)) {
651 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
652 jeb->free_size, jeb->offset);
653 jeb->wasted_size += jeb->free_size;
654 c->wasted_size += jeb->free_size;
655 c->free_size -= jeb->free_size;
656 jeb->free_size = 0;
657 }
658
659 return jffs2_scan_classify_jeb(c, jeb);
660
661 crc_err:
662 JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
663
664 return 0;
665 }
666
667 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
668
669 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
670 uint32_t infosize, uint32_t datasize, int padsize)
671 {
672 struct jffs2_raw_summary isum;
673 union jffs2_sum_mem *temp;
674 struct jffs2_sum_marker *sm;
675 struct kvec vecs[2];
676 uint32_t sum_ofs;
677 void *wpage;
678 int ret;
679 size_t retlen;
680
681 if (padsize + datasize > MAX_SUMMARY_SIZE) {
682 /* It won't fit in the buffer. Abort summary for this jeb */
683 jffs2_sum_disable_collecting(c->summary);
684
685 JFFS2_WARNING("Summary too big (%d data, %d pad) in eraseblock at %08x\n",
686 datasize, padsize, jeb->offset);
687 /* Non-fatal */
688 return 0;
689 }
690 /* Is there enough space for summary? */
691 if (padsize < 0) {
692 /* don't try to write out summary for this jeb */
693 jffs2_sum_disable_collecting(c->summary);
694
695 JFFS2_WARNING("Not enough space for summary, padsize = %d\n",
696 padsize);
697 /* Non-fatal */
698 return 0;
699 }
700
701 memset(c->summary->sum_buf, 0xff, datasize);
702 memset(&isum, 0, sizeof(isum));
703
704 isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
705 isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
706 isum.totlen = cpu_to_je32(infosize);
707 isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
708 isum.padded = cpu_to_je32(c->summary->sum_padded);
709 isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
710 isum.sum_num = cpu_to_je32(c->summary->sum_num);
711 wpage = c->summary->sum_buf;
712
713 while (c->summary->sum_num) {
714 temp = c->summary->sum_list_head;
715
716 switch (je16_to_cpu(temp->u.nodetype)) {
717 case JFFS2_NODETYPE_INODE: {
718 struct jffs2_sum_inode_flash *sino_ptr = wpage;
719
720 sino_ptr->nodetype = temp->i.nodetype;
721 sino_ptr->inode = temp->i.inode;
722 sino_ptr->version = temp->i.version;
723 sino_ptr->offset = temp->i.offset;
724 sino_ptr->totlen = temp->i.totlen;
725
726 wpage += JFFS2_SUMMARY_INODE_SIZE;
727
728 break;
729 }
730
731 case JFFS2_NODETYPE_DIRENT: {
732 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
733
734 sdrnt_ptr->nodetype = temp->d.nodetype;
735 sdrnt_ptr->totlen = temp->d.totlen;
736 sdrnt_ptr->offset = temp->d.offset;
737 sdrnt_ptr->pino = temp->d.pino;
738 sdrnt_ptr->version = temp->d.version;
739 sdrnt_ptr->ino = temp->d.ino;
740 sdrnt_ptr->nsize = temp->d.nsize;
741 sdrnt_ptr->type = temp->d.type;
742
743 memcpy(sdrnt_ptr->name, temp->d.name,
744 temp->d.nsize);
745
746 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
747
748 break;
749 }
750 #ifdef CONFIG_JFFS2_FS_XATTR
751 case JFFS2_NODETYPE_XATTR: {
752 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
753
754 temp = c->summary->sum_list_head;
755 sxattr_ptr->nodetype = temp->x.nodetype;
756 sxattr_ptr->xid = temp->x.xid;
757 sxattr_ptr->version = temp->x.version;
758 sxattr_ptr->offset = temp->x.offset;
759 sxattr_ptr->totlen = temp->x.totlen;
760
761 wpage += JFFS2_SUMMARY_XATTR_SIZE;
762 break;
763 }
764 case JFFS2_NODETYPE_XREF: {
765 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
766
767 temp = c->summary->sum_list_head;
768 sxref_ptr->nodetype = temp->r.nodetype;
769 sxref_ptr->offset = temp->r.offset;
770
771 wpage += JFFS2_SUMMARY_XREF_SIZE;
772 break;
773 }
774 #endif
775 default : {
776 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
777 == JFFS2_FEATURE_RWCOMPAT_COPY) {
778 dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
779 je16_to_cpu(temp->u.nodetype));
780 jffs2_sum_disable_collecting(c->summary);
781 } else {
782 BUG(); /* unknown node in summary information */
783 }
784 }
785 }
786
787 c->summary->sum_list_head = temp->u.next;
788 kfree(temp);
789
790 c->summary->sum_num--;
791 }
792
793 jffs2_sum_reset_collected(c->summary);
794
795 wpage += padsize;
796
797 sm = wpage;
798 sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
799 sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
800
801 isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
802 isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
803
804 vecs[0].iov_base = &isum;
805 vecs[0].iov_len = sizeof(isum);
806 vecs[1].iov_base = c->summary->sum_buf;
807 vecs[1].iov_len = datasize;
808
809 sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
810
811 dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
812 sum_ofs);
813
814 ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
815
816 if (ret || (retlen != infosize)) {
817
818 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
819 infosize, sum_ofs, ret, retlen);
820
821 if (retlen) {
822 /* Waste remaining space */
823 spin_lock(&c->erase_completion_lock);
824 jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
825 spin_unlock(&c->erase_completion_lock);
826 }
827
828 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
829
830 return 0;
831 }
832
833 spin_lock(&c->erase_completion_lock);
834 jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
835 spin_unlock(&c->erase_completion_lock);
836
837 return 0;
838 }
839
840 /* Write out summary information - called from jffs2_do_reserve_space */
841
842 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
843 {
844 int datasize, infosize, padsize;
845 struct jffs2_eraseblock *jeb;
846 int ret = 0;
847
848 dbg_summary("called\n");
849
850 spin_unlock(&c->erase_completion_lock);
851
852 jeb = c->nextblock;
853 jffs2_prealloc_raw_node_refs(c, jeb, 1);
854
855 if (!c->summary->sum_num || !c->summary->sum_list_head) {
856 JFFS2_WARNING("Empty summary info!!!\n");
857 BUG();
858 }
859
860 datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
861 infosize = sizeof(struct jffs2_raw_summary) + datasize;
862 padsize = jeb->free_size - infosize;
863 infosize += padsize;
864 datasize += padsize;
865
866 ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
867 spin_lock(&c->erase_completion_lock);
868 return ret;
869 }