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 int checkedlen; 433 spd = sp; 434 435 dbg_summary("Dirent at 0x%08x-0x%08x\n", 436 jeb->offset + je32_to_cpu(spd->offset), 437 jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen)); 438 439 440 /* This should never happen, but https://dev.laptop.org/ticket/4184 */ 441 checkedlen = strnlen(spd->name, spd->nsize); 442 if (!checkedlen) { 443 printk(KERN_ERR "Dirent at %08x has zero at start of name. Aborting mount.\n", 444 jeb->offset + je32_to_cpu(spd->offset)); 445 return -EIO; 446 } 447 if (checkedlen < spd->nsize) { 448 printk(KERN_ERR "Dirent at %08x has zeroes in name. Truncating to %d chars\n", 449 jeb->offset + je32_to_cpu(spd->offset), checkedlen); 450 } 451 452 453 fd = jffs2_alloc_full_dirent(checkedlen+1); 454 if (!fd) 455 return -ENOMEM; 456 457 memcpy(&fd->name, spd->name, checkedlen); 458 fd->name[checkedlen] = 0; 459 460 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino)); 461 if (!ic) { 462 jffs2_free_full_dirent(fd); 463 return -ENOMEM; 464 } 465 466 fd->raw = sum_link_node_ref(c, jeb, je32_to_cpu(spd->offset) | REF_UNCHECKED, 467 PAD(je32_to_cpu(spd->totlen)), ic); 468 469 fd->next = NULL; 470 fd->version = je32_to_cpu(spd->version); 471 fd->ino = je32_to_cpu(spd->ino); 472 fd->nhash = full_name_hash(fd->name, checkedlen); 473 fd->type = spd->type; 474 475 jffs2_add_fd_to_list(c, fd, &ic->scan_dents); 476 477 *pseudo_random += je32_to_cpu(spd->version); 478 479 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize); 480 481 break; 482 } 483 #ifdef CONFIG_JFFS2_FS_XATTR 484 case JFFS2_NODETYPE_XATTR: { 485 struct jffs2_xattr_datum *xd; 486 struct jffs2_sum_xattr_flash *spx; 487 488 spx = (struct jffs2_sum_xattr_flash *)sp; 489 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", 490 jeb->offset + je32_to_cpu(spx->offset), 491 jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen), 492 je32_to_cpu(spx->xid), je32_to_cpu(spx->version)); 493 494 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid), 495 je32_to_cpu(spx->version)); 496 if (IS_ERR(xd)) 497 return PTR_ERR(xd); 498 if (xd->version > je32_to_cpu(spx->version)) { 499 /* node is not the newest one */ 500 struct jffs2_raw_node_ref *raw 501 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, 502 PAD(je32_to_cpu(spx->totlen)), NULL); 503 raw->next_in_ino = xd->node->next_in_ino; 504 xd->node->next_in_ino = raw; 505 } else { 506 xd->version = je32_to_cpu(spx->version); 507 sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, 508 PAD(je32_to_cpu(spx->totlen)), (void *)xd); 509 } 510 *pseudo_random += je32_to_cpu(spx->xid); 511 sp += JFFS2_SUMMARY_XATTR_SIZE; 512 513 break; 514 } 515 case JFFS2_NODETYPE_XREF: { 516 struct jffs2_xattr_ref *ref; 517 struct jffs2_sum_xref_flash *spr; 518 519 spr = (struct jffs2_sum_xref_flash *)sp; 520 dbg_summary("xref at %#08x-%#08x\n", 521 jeb->offset + je32_to_cpu(spr->offset), 522 jeb->offset + je32_to_cpu(spr->offset) + 523 (uint32_t)PAD(sizeof(struct jffs2_raw_xref))); 524 525 ref = jffs2_alloc_xattr_ref(); 526 if (!ref) { 527 JFFS2_NOTICE("allocation of xattr_datum failed\n"); 528 return -ENOMEM; 529 } 530 ref->next = c->xref_temp; 531 c->xref_temp = ref; 532 533 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED, 534 PAD(sizeof(struct jffs2_raw_xref)), (void *)ref); 535 536 *pseudo_random += ref->node->flash_offset; 537 sp += JFFS2_SUMMARY_XREF_SIZE; 538 539 break; 540 } 541 #endif 542 default : { 543 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype); 544 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype); 545 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT) 546 return -EIO; 547 548 /* For compatible node types, just fall back to the full scan */ 549 c->wasted_size -= jeb->wasted_size; 550 c->free_size += c->sector_size - jeb->free_size; 551 c->used_size -= jeb->used_size; 552 c->dirty_size -= jeb->dirty_size; 553 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0; 554 jeb->free_size = c->sector_size; 555 556 jffs2_free_jeb_node_refs(c, jeb); 557 return -ENOTRECOVERABLE; 558 } 559 } 560 } 561 return 0; 562 } 563 564 /* Process the summary node - called from jffs2_scan_eraseblock() */ 565 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 566 struct jffs2_raw_summary *summary, uint32_t sumsize, 567 uint32_t *pseudo_random) 568 { 569 struct jffs2_unknown_node crcnode; 570 int ret, ofs; 571 uint32_t crc; 572 573 ofs = c->sector_size - sumsize; 574 575 dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n", 576 jeb->offset, jeb->offset + ofs, sumsize); 577 578 /* OK, now check for node validity and CRC */ 579 crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 580 crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 581 crcnode.totlen = summary->totlen; 582 crc = crc32(0, &crcnode, sizeof(crcnode)-4); 583 584 if (je32_to_cpu(summary->hdr_crc) != crc) { 585 dbg_summary("Summary node header is corrupt (bad CRC or " 586 "no summary at all)\n"); 587 goto crc_err; 588 } 589 590 if (je32_to_cpu(summary->totlen) != sumsize) { 591 dbg_summary("Summary node is corrupt (wrong erasesize?)\n"); 592 goto crc_err; 593 } 594 595 crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8); 596 597 if (je32_to_cpu(summary->node_crc) != crc) { 598 dbg_summary("Summary node is corrupt (bad CRC)\n"); 599 goto crc_err; 600 } 601 602 crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary)); 603 604 if (je32_to_cpu(summary->sum_crc) != crc) { 605 dbg_summary("Summary node data is corrupt (bad CRC)\n"); 606 goto crc_err; 607 } 608 609 if ( je32_to_cpu(summary->cln_mkr) ) { 610 611 dbg_summary("Summary : CLEANMARKER node \n"); 612 613 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1); 614 if (ret) 615 return ret; 616 617 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) { 618 dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n", 619 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size); 620 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) 621 return ret; 622 } else if (jeb->first_node) { 623 dbg_summary("CLEANMARKER node not first node in block " 624 "(0x%08x)\n", jeb->offset); 625 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) 626 return ret; 627 } else { 628 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, 629 je32_to_cpu(summary->cln_mkr), NULL); 630 } 631 } 632 633 ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random); 634 /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full 635 scan of this eraseblock. So return zero */ 636 if (ret == -ENOTRECOVERABLE) 637 return 0; 638 if (ret) 639 return ret; /* real error */ 640 641 /* for PARANOIA_CHECK */ 642 ret = jffs2_prealloc_raw_node_refs(c, jeb, 2); 643 if (ret) 644 return ret; 645 646 sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL); 647 648 if (unlikely(jeb->free_size)) { 649 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n", 650 jeb->free_size, jeb->offset); 651 jeb->wasted_size += jeb->free_size; 652 c->wasted_size += jeb->free_size; 653 c->free_size -= jeb->free_size; 654 jeb->free_size = 0; 655 } 656 657 return jffs2_scan_classify_jeb(c, jeb); 658 659 crc_err: 660 JFFS2_WARNING("Summary node crc error, skipping summary information.\n"); 661 662 return 0; 663 } 664 665 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */ 666 667 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 668 uint32_t infosize, uint32_t datasize, int padsize) 669 { 670 struct jffs2_raw_summary isum; 671 union jffs2_sum_mem *temp; 672 struct jffs2_sum_marker *sm; 673 struct kvec vecs[2]; 674 uint32_t sum_ofs; 675 void *wpage; 676 int ret; 677 size_t retlen; 678 679 memset(c->summary->sum_buf, 0xff, datasize); 680 memset(&isum, 0, sizeof(isum)); 681 682 isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 683 isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 684 isum.totlen = cpu_to_je32(infosize); 685 isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4)); 686 isum.padded = cpu_to_je32(c->summary->sum_padded); 687 isum.cln_mkr = cpu_to_je32(c->cleanmarker_size); 688 isum.sum_num = cpu_to_je32(c->summary->sum_num); 689 wpage = c->summary->sum_buf; 690 691 while (c->summary->sum_num) { 692 temp = c->summary->sum_list_head; 693 694 switch (je16_to_cpu(temp->u.nodetype)) { 695 case JFFS2_NODETYPE_INODE: { 696 struct jffs2_sum_inode_flash *sino_ptr = wpage; 697 698 sino_ptr->nodetype = temp->i.nodetype; 699 sino_ptr->inode = temp->i.inode; 700 sino_ptr->version = temp->i.version; 701 sino_ptr->offset = temp->i.offset; 702 sino_ptr->totlen = temp->i.totlen; 703 704 wpage += JFFS2_SUMMARY_INODE_SIZE; 705 706 break; 707 } 708 709 case JFFS2_NODETYPE_DIRENT: { 710 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage; 711 712 sdrnt_ptr->nodetype = temp->d.nodetype; 713 sdrnt_ptr->totlen = temp->d.totlen; 714 sdrnt_ptr->offset = temp->d.offset; 715 sdrnt_ptr->pino = temp->d.pino; 716 sdrnt_ptr->version = temp->d.version; 717 sdrnt_ptr->ino = temp->d.ino; 718 sdrnt_ptr->nsize = temp->d.nsize; 719 sdrnt_ptr->type = temp->d.type; 720 721 memcpy(sdrnt_ptr->name, temp->d.name, 722 temp->d.nsize); 723 724 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize); 725 726 break; 727 } 728 #ifdef CONFIG_JFFS2_FS_XATTR 729 case JFFS2_NODETYPE_XATTR: { 730 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage; 731 732 temp = c->summary->sum_list_head; 733 sxattr_ptr->nodetype = temp->x.nodetype; 734 sxattr_ptr->xid = temp->x.xid; 735 sxattr_ptr->version = temp->x.version; 736 sxattr_ptr->offset = temp->x.offset; 737 sxattr_ptr->totlen = temp->x.totlen; 738 739 wpage += JFFS2_SUMMARY_XATTR_SIZE; 740 break; 741 } 742 case JFFS2_NODETYPE_XREF: { 743 struct jffs2_sum_xref_flash *sxref_ptr = wpage; 744 745 temp = c->summary->sum_list_head; 746 sxref_ptr->nodetype = temp->r.nodetype; 747 sxref_ptr->offset = temp->r.offset; 748 749 wpage += JFFS2_SUMMARY_XREF_SIZE; 750 break; 751 } 752 #endif 753 default : { 754 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK) 755 == JFFS2_FEATURE_RWCOMPAT_COPY) { 756 dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n", 757 je16_to_cpu(temp->u.nodetype)); 758 jffs2_sum_disable_collecting(c->summary); 759 } else { 760 BUG(); /* unknown node in summary information */ 761 } 762 } 763 } 764 765 c->summary->sum_list_head = temp->u.next; 766 kfree(temp); 767 768 c->summary->sum_num--; 769 } 770 771 jffs2_sum_reset_collected(c->summary); 772 773 wpage += padsize; 774 775 sm = wpage; 776 sm->offset = cpu_to_je32(c->sector_size - jeb->free_size); 777 sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC); 778 779 isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize)); 780 isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8)); 781 782 vecs[0].iov_base = &isum; 783 vecs[0].iov_len = sizeof(isum); 784 vecs[1].iov_base = c->summary->sum_buf; 785 vecs[1].iov_len = datasize; 786 787 sum_ofs = jeb->offset + c->sector_size - jeb->free_size; 788 789 dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n", 790 sum_ofs); 791 792 ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0); 793 794 if (ret || (retlen != infosize)) { 795 796 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n", 797 infosize, sum_ofs, ret, retlen); 798 799 if (retlen) { 800 /* Waste remaining space */ 801 spin_lock(&c->erase_completion_lock); 802 jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL); 803 spin_unlock(&c->erase_completion_lock); 804 } 805 806 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; 807 808 return 0; 809 } 810 811 spin_lock(&c->erase_completion_lock); 812 jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL); 813 spin_unlock(&c->erase_completion_lock); 814 815 return 0; 816 } 817 818 /* Write out summary information - called from jffs2_do_reserve_space */ 819 820 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c) 821 { 822 int datasize, infosize, padsize; 823 struct jffs2_eraseblock *jeb; 824 int ret; 825 826 dbg_summary("called\n"); 827 828 spin_unlock(&c->erase_completion_lock); 829 830 jeb = c->nextblock; 831 jffs2_prealloc_raw_node_refs(c, jeb, 1); 832 833 if (!c->summary->sum_num || !c->summary->sum_list_head) { 834 JFFS2_WARNING("Empty summary info!!!\n"); 835 BUG(); 836 } 837 838 datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker); 839 infosize = sizeof(struct jffs2_raw_summary) + datasize; 840 padsize = jeb->free_size - infosize; 841 infosize += padsize; 842 datasize += padsize; 843 844 /* Is there enough space for summary? */ 845 if (padsize < 0) { 846 /* don't try to write out summary for this jeb */ 847 jffs2_sum_disable_collecting(c->summary); 848 849 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize); 850 spin_lock(&c->erase_completion_lock); 851 return 0; 852 } 853 854 ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize); 855 spin_lock(&c->erase_completion_lock); 856 return ret; 857 } 858