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 begining 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 begining 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 } 870