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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 15 16 #include <linux/kernel.h> 17 #include <linux/slab.h> 18 #include <linux/mtd/mtd.h> 19 #include <linux/pagemap.h> 20 #include <linux/crc32.h> 21 #include <linux/compiler.h> 22 #include <linux/vmalloc.h> 23 #include "nodelist.h" 24 #include "debug.h" 25 26 int jffs2_sum_init(struct jffs2_sb_info *c) 27 { 28 uint32_t sum_size = min_t(uint32_t, c->sector_size, MAX_SUMMARY_SIZE); 29 30 c->summary = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL); 31 32 if (!c->summary) { 33 JFFS2_WARNING("Can't allocate memory for summary information!\n"); 34 return -ENOMEM; 35 } 36 37 c->summary->sum_buf = kmalloc(sum_size, GFP_KERNEL); 38 39 if (!c->summary->sum_buf) { 40 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n"); 41 kfree(c->summary); 42 return -ENOMEM; 43 } 44 45 dbg_summary("returned successfully\n"); 46 47 return 0; 48 } 49 50 void jffs2_sum_exit(struct jffs2_sb_info *c) 51 { 52 dbg_summary("called\n"); 53 54 jffs2_sum_disable_collecting(c->summary); 55 56 kfree(c->summary->sum_buf); 57 c->summary->sum_buf = NULL; 58 59 kfree(c->summary); 60 c->summary = NULL; 61 } 62 63 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item) 64 { 65 if (!s->sum_list_head) 66 s->sum_list_head = (union jffs2_sum_mem *) item; 67 if (s->sum_list_tail) 68 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item; 69 s->sum_list_tail = (union jffs2_sum_mem *) item; 70 71 switch (je16_to_cpu(item->u.nodetype)) { 72 case JFFS2_NODETYPE_INODE: 73 s->sum_size += JFFS2_SUMMARY_INODE_SIZE; 74 s->sum_num++; 75 dbg_summary("inode (%u) added to summary\n", 76 je32_to_cpu(item->i.inode)); 77 break; 78 case JFFS2_NODETYPE_DIRENT: 79 s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize); 80 s->sum_num++; 81 dbg_summary("dirent (%u) added to summary\n", 82 je32_to_cpu(item->d.ino)); 83 break; 84 #ifdef CONFIG_JFFS2_FS_XATTR 85 case JFFS2_NODETYPE_XATTR: 86 s->sum_size += JFFS2_SUMMARY_XATTR_SIZE; 87 s->sum_num++; 88 dbg_summary("xattr (xid=%u, version=%u) added to summary\n", 89 je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version)); 90 break; 91 case JFFS2_NODETYPE_XREF: 92 s->sum_size += JFFS2_SUMMARY_XREF_SIZE; 93 s->sum_num++; 94 dbg_summary("xref added to summary\n"); 95 break; 96 #endif 97 default: 98 JFFS2_WARNING("UNKNOWN node type %u\n", 99 je16_to_cpu(item->u.nodetype)); 100 return 1; 101 } 102 return 0; 103 } 104 105 106 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */ 107 108 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size) 109 { 110 dbg_summary("called with %u\n", size); 111 s->sum_padded += size; 112 return 0; 113 } 114 115 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, 116 uint32_t ofs) 117 { 118 struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); 119 120 if (!temp) 121 return -ENOMEM; 122 123 temp->nodetype = ri->nodetype; 124 temp->inode = ri->ino; 125 temp->version = ri->version; 126 temp->offset = cpu_to_je32(ofs); /* relative offset from the beginning of the jeb */ 127 temp->totlen = ri->totlen; 128 temp->next = NULL; 129 130 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 131 } 132 133 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, 134 uint32_t ofs) 135 { 136 struct jffs2_sum_dirent_mem *temp = 137 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL); 138 139 if (!temp) 140 return -ENOMEM; 141 142 temp->nodetype = rd->nodetype; 143 temp->totlen = rd->totlen; 144 temp->offset = cpu_to_je32(ofs); /* relative from the beginning of the jeb */ 145 temp->pino = rd->pino; 146 temp->version = rd->version; 147 temp->ino = rd->ino; 148 temp->nsize = rd->nsize; 149 temp->type = rd->type; 150 temp->next = NULL; 151 152 memcpy(temp->name, rd->name, rd->nsize); 153 154 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 155 } 156 157 #ifdef CONFIG_JFFS2_FS_XATTR 158 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs) 159 { 160 struct jffs2_sum_xattr_mem *temp; 161 162 temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL); 163 if (!temp) 164 return -ENOMEM; 165 166 temp->nodetype = rx->nodetype; 167 temp->xid = rx->xid; 168 temp->version = rx->version; 169 temp->offset = cpu_to_je32(ofs); 170 temp->totlen = rx->totlen; 171 temp->next = NULL; 172 173 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 174 } 175 176 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs) 177 { 178 struct jffs2_sum_xref_mem *temp; 179 180 temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL); 181 if (!temp) 182 return -ENOMEM; 183 184 temp->nodetype = rr->nodetype; 185 temp->offset = cpu_to_je32(ofs); 186 temp->next = NULL; 187 188 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 189 } 190 #endif 191 /* Cleanup every collected summary information */ 192 193 static void jffs2_sum_clean_collected(struct jffs2_summary *s) 194 { 195 union jffs2_sum_mem *temp; 196 197 if (!s->sum_list_head) { 198 dbg_summary("already empty\n"); 199 } 200 while (s->sum_list_head) { 201 temp = s->sum_list_head; 202 s->sum_list_head = s->sum_list_head->u.next; 203 kfree(temp); 204 } 205 s->sum_list_tail = NULL; 206 s->sum_padded = 0; 207 s->sum_num = 0; 208 } 209 210 void jffs2_sum_reset_collected(struct jffs2_summary *s) 211 { 212 dbg_summary("called\n"); 213 jffs2_sum_clean_collected(s); 214 s->sum_size = 0; 215 } 216 217 void jffs2_sum_disable_collecting(struct jffs2_summary *s) 218 { 219 dbg_summary("called\n"); 220 jffs2_sum_clean_collected(s); 221 s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; 222 } 223 224 int jffs2_sum_is_disabled(struct jffs2_summary *s) 225 { 226 return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE); 227 } 228 229 /* Move the collected summary information into sb (called from scan.c) */ 230 231 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s) 232 { 233 dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n", 234 c->summary->sum_size, c->summary->sum_num, 235 s->sum_size, s->sum_num); 236 237 c->summary->sum_size = s->sum_size; 238 c->summary->sum_num = s->sum_num; 239 c->summary->sum_padded = s->sum_padded; 240 c->summary->sum_list_head = s->sum_list_head; 241 c->summary->sum_list_tail = s->sum_list_tail; 242 243 s->sum_list_head = s->sum_list_tail = NULL; 244 } 245 246 /* Called from wbuf.c to collect writed node info */ 247 248 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs, 249 unsigned long count, uint32_t ofs) 250 { 251 union jffs2_node_union *node; 252 struct jffs2_eraseblock *jeb; 253 254 if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) { 255 dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n"); 256 return 0; 257 } 258 259 node = invecs[0].iov_base; 260 jeb = &c->blocks[ofs / c->sector_size]; 261 ofs -= jeb->offset; 262 263 switch (je16_to_cpu(node->u.nodetype)) { 264 case JFFS2_NODETYPE_INODE: { 265 struct jffs2_sum_inode_mem *temp = 266 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); 267 268 if (!temp) 269 goto no_mem; 270 271 temp->nodetype = node->i.nodetype; 272 temp->inode = node->i.ino; 273 temp->version = node->i.version; 274 temp->offset = cpu_to_je32(ofs); 275 temp->totlen = node->i.totlen; 276 temp->next = NULL; 277 278 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 279 } 280 281 case JFFS2_NODETYPE_DIRENT: { 282 struct jffs2_sum_dirent_mem *temp = 283 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL); 284 285 if (!temp) 286 goto no_mem; 287 288 temp->nodetype = node->d.nodetype; 289 temp->totlen = node->d.totlen; 290 temp->offset = cpu_to_je32(ofs); 291 temp->pino = node->d.pino; 292 temp->version = node->d.version; 293 temp->ino = node->d.ino; 294 temp->nsize = node->d.nsize; 295 temp->type = node->d.type; 296 temp->next = NULL; 297 298 switch (count) { 299 case 1: 300 memcpy(temp->name,node->d.name,node->d.nsize); 301 break; 302 303 case 2: 304 memcpy(temp->name,invecs[1].iov_base,node->d.nsize); 305 break; 306 307 default: 308 BUG(); /* impossible count value */ 309 break; 310 } 311 312 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 313 } 314 #ifdef CONFIG_JFFS2_FS_XATTR 315 case JFFS2_NODETYPE_XATTR: { 316 struct jffs2_sum_xattr_mem *temp; 317 temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL); 318 if (!temp) 319 goto no_mem; 320 321 temp->nodetype = node->x.nodetype; 322 temp->xid = node->x.xid; 323 temp->version = node->x.version; 324 temp->totlen = node->x.totlen; 325 temp->offset = cpu_to_je32(ofs); 326 temp->next = NULL; 327 328 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 329 } 330 case JFFS2_NODETYPE_XREF: { 331 struct jffs2_sum_xref_mem *temp; 332 temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL); 333 if (!temp) 334 goto no_mem; 335 temp->nodetype = node->r.nodetype; 336 temp->offset = cpu_to_je32(ofs); 337 temp->next = NULL; 338 339 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 340 } 341 #endif 342 case JFFS2_NODETYPE_PADDING: 343 dbg_summary("node PADDING\n"); 344 c->summary->sum_padded += je32_to_cpu(node->u.totlen); 345 break; 346 347 case JFFS2_NODETYPE_CLEANMARKER: 348 dbg_summary("node CLEANMARKER\n"); 349 break; 350 351 case JFFS2_NODETYPE_SUMMARY: 352 dbg_summary("node SUMMARY\n"); 353 break; 354 355 default: 356 /* If you implement a new node type you should also implement 357 summary support for it or disable summary. 358 */ 359 BUG(); 360 break; 361 } 362 363 return 0; 364 365 no_mem: 366 JFFS2_WARNING("MEMORY ALLOCATION ERROR!"); 367 return -ENOMEM; 368 } 369 370 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c, 371 struct jffs2_eraseblock *jeb, 372 uint32_t ofs, uint32_t len, 373 struct jffs2_inode_cache *ic) 374 { 375 /* If there was a gap, mark it dirty */ 376 if ((ofs & ~3) > c->sector_size - jeb->free_size) { 377 /* Ew. Summary doesn't actually tell us explicitly about dirty space */ 378 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size)); 379 } 380 381 return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic); 382 } 383 384 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */ 385 386 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 387 struct jffs2_raw_summary *summary, uint32_t *pseudo_random) 388 { 389 struct jffs2_inode_cache *ic; 390 struct jffs2_full_dirent *fd; 391 void *sp; 392 int i, ino; 393 int err; 394 395 sp = summary->sum; 396 397 for (i=0; i<je32_to_cpu(summary->sum_num); i++) { 398 dbg_summary("processing summary index %d\n", i); 399 400 cond_resched(); 401 402 /* Make sure there's a spare ref for dirty space */ 403 err = jffs2_prealloc_raw_node_refs(c, jeb, 2); 404 if (err) 405 return err; 406 407 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) { 408 case JFFS2_NODETYPE_INODE: { 409 struct jffs2_sum_inode_flash *spi; 410 spi = sp; 411 412 ino = je32_to_cpu(spi->inode); 413 414 dbg_summary("Inode at 0x%08x-0x%08x\n", 415 jeb->offset + je32_to_cpu(spi->offset), 416 jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen)); 417 418 ic = jffs2_scan_make_ino_cache(c, ino); 419 if (!ic) { 420 JFFS2_NOTICE("scan_make_ino_cache failed\n"); 421 return -ENOMEM; 422 } 423 424 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED, 425 PAD(je32_to_cpu(spi->totlen)), ic); 426 427 *pseudo_random += je32_to_cpu(spi->version); 428 429 sp += JFFS2_SUMMARY_INODE_SIZE; 430 431 break; 432 } 433 434 case JFFS2_NODETYPE_DIRENT: { 435 struct jffs2_sum_dirent_flash *spd; 436 int checkedlen; 437 spd = sp; 438 439 dbg_summary("Dirent at 0x%08x-0x%08x\n", 440 jeb->offset + je32_to_cpu(spd->offset), 441 jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen)); 442 443 444 /* This should never happen, but https://dev.laptop.org/ticket/4184 */ 445 checkedlen = strnlen(spd->name, spd->nsize); 446 if (!checkedlen) { 447 pr_err("Dirent at %08x has zero at start of name. Aborting mount.\n", 448 jeb->offset + 449 je32_to_cpu(spd->offset)); 450 return -EIO; 451 } 452 if (checkedlen < spd->nsize) { 453 pr_err("Dirent at %08x has zeroes in name. Truncating to %d chars\n", 454 jeb->offset + 455 je32_to_cpu(spd->offset), 456 checkedlen); 457 } 458 459 460 fd = jffs2_alloc_full_dirent(checkedlen+1); 461 if (!fd) 462 return -ENOMEM; 463 464 memcpy(&fd->name, spd->name, checkedlen); 465 fd->name[checkedlen] = 0; 466 467 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino)); 468 if (!ic) { 469 jffs2_free_full_dirent(fd); 470 return -ENOMEM; 471 } 472 473 fd->raw = sum_link_node_ref(c, jeb, je32_to_cpu(spd->offset) | REF_UNCHECKED, 474 PAD(je32_to_cpu(spd->totlen)), ic); 475 476 fd->next = NULL; 477 fd->version = je32_to_cpu(spd->version); 478 fd->ino = je32_to_cpu(spd->ino); 479 fd->nhash = full_name_hash(NULL, fd->name, checkedlen); 480 fd->type = spd->type; 481 482 jffs2_add_fd_to_list(c, fd, &ic->scan_dents); 483 484 *pseudo_random += je32_to_cpu(spd->version); 485 486 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize); 487 488 break; 489 } 490 #ifdef CONFIG_JFFS2_FS_XATTR 491 case JFFS2_NODETYPE_XATTR: { 492 struct jffs2_xattr_datum *xd; 493 struct jffs2_sum_xattr_flash *spx; 494 495 spx = (struct jffs2_sum_xattr_flash *)sp; 496 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", 497 jeb->offset + je32_to_cpu(spx->offset), 498 jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen), 499 je32_to_cpu(spx->xid), je32_to_cpu(spx->version)); 500 501 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid), 502 je32_to_cpu(spx->version)); 503 if (IS_ERR(xd)) 504 return PTR_ERR(xd); 505 if (xd->version > je32_to_cpu(spx->version)) { 506 /* node is not the newest one */ 507 struct jffs2_raw_node_ref *raw 508 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, 509 PAD(je32_to_cpu(spx->totlen)), NULL); 510 raw->next_in_ino = xd->node->next_in_ino; 511 xd->node->next_in_ino = raw; 512 } else { 513 xd->version = je32_to_cpu(spx->version); 514 sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, 515 PAD(je32_to_cpu(spx->totlen)), (void *)xd); 516 } 517 *pseudo_random += je32_to_cpu(spx->xid); 518 sp += JFFS2_SUMMARY_XATTR_SIZE; 519 520 break; 521 } 522 case JFFS2_NODETYPE_XREF: { 523 struct jffs2_xattr_ref *ref; 524 struct jffs2_sum_xref_flash *spr; 525 526 spr = (struct jffs2_sum_xref_flash *)sp; 527 dbg_summary("xref at %#08x-%#08x\n", 528 jeb->offset + je32_to_cpu(spr->offset), 529 jeb->offset + je32_to_cpu(spr->offset) + 530 (uint32_t)PAD(sizeof(struct jffs2_raw_xref))); 531 532 ref = jffs2_alloc_xattr_ref(); 533 if (!ref) { 534 JFFS2_NOTICE("allocation of xattr_datum failed\n"); 535 return -ENOMEM; 536 } 537 ref->next = c->xref_temp; 538 c->xref_temp = ref; 539 540 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED, 541 PAD(sizeof(struct jffs2_raw_xref)), (void *)ref); 542 543 *pseudo_random += ref->node->flash_offset; 544 sp += JFFS2_SUMMARY_XREF_SIZE; 545 546 break; 547 } 548 #endif 549 default : { 550 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype); 551 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype); 552 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT) 553 return -EIO; 554 555 /* For compatible node types, just fall back to the full scan */ 556 c->wasted_size -= jeb->wasted_size; 557 c->free_size += c->sector_size - jeb->free_size; 558 c->used_size -= jeb->used_size; 559 c->dirty_size -= jeb->dirty_size; 560 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0; 561 jeb->free_size = c->sector_size; 562 563 jffs2_free_jeb_node_refs(c, jeb); 564 return -ENOTRECOVERABLE; 565 } 566 } 567 } 568 return 0; 569 } 570 571 /* Process the summary node - called from jffs2_scan_eraseblock() */ 572 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 573 struct jffs2_raw_summary *summary, uint32_t sumsize, 574 uint32_t *pseudo_random) 575 { 576 struct jffs2_unknown_node crcnode; 577 int ret, ofs; 578 uint32_t crc; 579 580 ofs = c->sector_size - sumsize; 581 582 dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n", 583 jeb->offset, jeb->offset + ofs, sumsize); 584 585 /* OK, now check for node validity and CRC */ 586 crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 587 crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 588 crcnode.totlen = summary->totlen; 589 crc = crc32(0, &crcnode, sizeof(crcnode)-4); 590 591 if (je32_to_cpu(summary->hdr_crc) != crc) { 592 dbg_summary("Summary node header is corrupt (bad CRC or " 593 "no summary at all)\n"); 594 goto crc_err; 595 } 596 597 if (je32_to_cpu(summary->totlen) != sumsize) { 598 dbg_summary("Summary node is corrupt (wrong erasesize?)\n"); 599 goto crc_err; 600 } 601 602 crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8); 603 604 if (je32_to_cpu(summary->node_crc) != crc) { 605 dbg_summary("Summary node is corrupt (bad CRC)\n"); 606 goto crc_err; 607 } 608 609 crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary)); 610 611 if (je32_to_cpu(summary->sum_crc) != crc) { 612 dbg_summary("Summary node data is corrupt (bad CRC)\n"); 613 goto crc_err; 614 } 615 616 if ( je32_to_cpu(summary->cln_mkr) ) { 617 618 dbg_summary("Summary : CLEANMARKER node \n"); 619 620 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1); 621 if (ret) 622 return ret; 623 624 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) { 625 dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n", 626 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size); 627 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) 628 return ret; 629 } else if (jeb->first_node) { 630 dbg_summary("CLEANMARKER node not first node in block " 631 "(0x%08x)\n", jeb->offset); 632 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) 633 return ret; 634 } else { 635 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, 636 je32_to_cpu(summary->cln_mkr), NULL); 637 } 638 } 639 640 ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random); 641 /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full 642 scan of this eraseblock. So return zero */ 643 if (ret == -ENOTRECOVERABLE) 644 return 0; 645 if (ret) 646 return ret; /* real error */ 647 648 /* for PARANOIA_CHECK */ 649 ret = jffs2_prealloc_raw_node_refs(c, jeb, 2); 650 if (ret) 651 return ret; 652 653 sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL); 654 655 if (unlikely(jeb->free_size)) { 656 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n", 657 jeb->free_size, jeb->offset); 658 jeb->wasted_size += jeb->free_size; 659 c->wasted_size += jeb->free_size; 660 c->free_size -= jeb->free_size; 661 jeb->free_size = 0; 662 } 663 664 return jffs2_scan_classify_jeb(c, jeb); 665 666 crc_err: 667 JFFS2_WARNING("Summary node crc error, skipping summary information.\n"); 668 669 return 0; 670 } 671 672 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */ 673 674 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 675 uint32_t infosize, uint32_t datasize, int padsize) 676 { 677 struct jffs2_raw_summary isum; 678 union jffs2_sum_mem *temp; 679 struct jffs2_sum_marker *sm; 680 struct kvec vecs[2]; 681 uint32_t sum_ofs; 682 void *wpage; 683 int ret; 684 size_t retlen; 685 686 if (padsize + datasize > MAX_SUMMARY_SIZE) { 687 /* It won't fit in the buffer. Abort summary for this jeb */ 688 jffs2_sum_disable_collecting(c->summary); 689 690 JFFS2_WARNING("Summary too big (%d data, %d pad) in eraseblock at %08x\n", 691 datasize, padsize, jeb->offset); 692 /* Non-fatal */ 693 return 0; 694 } 695 /* Is there enough space for summary? */ 696 if (padsize < 0) { 697 /* don't try to write out summary for this jeb */ 698 jffs2_sum_disable_collecting(c->summary); 699 700 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", 701 padsize); 702 /* Non-fatal */ 703 return 0; 704 } 705 706 memset(c->summary->sum_buf, 0xff, datasize); 707 memset(&isum, 0, sizeof(isum)); 708 709 isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 710 isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 711 isum.totlen = cpu_to_je32(infosize); 712 isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4)); 713 isum.padded = cpu_to_je32(c->summary->sum_padded); 714 isum.cln_mkr = cpu_to_je32(c->cleanmarker_size); 715 isum.sum_num = cpu_to_je32(c->summary->sum_num); 716 wpage = c->summary->sum_buf; 717 718 while (c->summary->sum_num) { 719 temp = c->summary->sum_list_head; 720 721 switch (je16_to_cpu(temp->u.nodetype)) { 722 case JFFS2_NODETYPE_INODE: { 723 struct jffs2_sum_inode_flash *sino_ptr = wpage; 724 725 sino_ptr->nodetype = temp->i.nodetype; 726 sino_ptr->inode = temp->i.inode; 727 sino_ptr->version = temp->i.version; 728 sino_ptr->offset = temp->i.offset; 729 sino_ptr->totlen = temp->i.totlen; 730 731 wpage += JFFS2_SUMMARY_INODE_SIZE; 732 733 break; 734 } 735 736 case JFFS2_NODETYPE_DIRENT: { 737 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage; 738 739 sdrnt_ptr->nodetype = temp->d.nodetype; 740 sdrnt_ptr->totlen = temp->d.totlen; 741 sdrnt_ptr->offset = temp->d.offset; 742 sdrnt_ptr->pino = temp->d.pino; 743 sdrnt_ptr->version = temp->d.version; 744 sdrnt_ptr->ino = temp->d.ino; 745 sdrnt_ptr->nsize = temp->d.nsize; 746 sdrnt_ptr->type = temp->d.type; 747 748 memcpy(sdrnt_ptr->name, temp->d.name, 749 temp->d.nsize); 750 751 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize); 752 753 break; 754 } 755 #ifdef CONFIG_JFFS2_FS_XATTR 756 case JFFS2_NODETYPE_XATTR: { 757 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage; 758 759 temp = c->summary->sum_list_head; 760 sxattr_ptr->nodetype = temp->x.nodetype; 761 sxattr_ptr->xid = temp->x.xid; 762 sxattr_ptr->version = temp->x.version; 763 sxattr_ptr->offset = temp->x.offset; 764 sxattr_ptr->totlen = temp->x.totlen; 765 766 wpage += JFFS2_SUMMARY_XATTR_SIZE; 767 break; 768 } 769 case JFFS2_NODETYPE_XREF: { 770 struct jffs2_sum_xref_flash *sxref_ptr = wpage; 771 772 temp = c->summary->sum_list_head; 773 sxref_ptr->nodetype = temp->r.nodetype; 774 sxref_ptr->offset = temp->r.offset; 775 776 wpage += JFFS2_SUMMARY_XREF_SIZE; 777 break; 778 } 779 #endif 780 default : { 781 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK) 782 == JFFS2_FEATURE_RWCOMPAT_COPY) { 783 dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n", 784 je16_to_cpu(temp->u.nodetype)); 785 jffs2_sum_disable_collecting(c->summary); 786 /* The above call removes the list, nothing more to do */ 787 goto bail_rwcompat; 788 } else { 789 BUG(); /* unknown node in summary information */ 790 } 791 } 792 } 793 794 c->summary->sum_list_head = temp->u.next; 795 kfree(temp); 796 797 c->summary->sum_num--; 798 } 799 bail_rwcompat: 800 801 jffs2_sum_reset_collected(c->summary); 802 803 wpage += padsize; 804 805 sm = wpage; 806 sm->offset = cpu_to_je32(c->sector_size - jeb->free_size); 807 sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC); 808 809 isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize)); 810 isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8)); 811 812 vecs[0].iov_base = &isum; 813 vecs[0].iov_len = sizeof(isum); 814 vecs[1].iov_base = c->summary->sum_buf; 815 vecs[1].iov_len = datasize; 816 817 sum_ofs = jeb->offset + c->sector_size - jeb->free_size; 818 819 dbg_summary("writing out data to flash to pos : 0x%08x\n", sum_ofs); 820 821 ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0); 822 823 if (ret || (retlen != infosize)) { 824 825 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n", 826 infosize, sum_ofs, ret, retlen); 827 828 if (retlen) { 829 /* Waste remaining space */ 830 spin_lock(&c->erase_completion_lock); 831 jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL); 832 spin_unlock(&c->erase_completion_lock); 833 } 834 835 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; 836 837 return 0; 838 } 839 840 spin_lock(&c->erase_completion_lock); 841 jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL); 842 spin_unlock(&c->erase_completion_lock); 843 844 return 0; 845 } 846 847 /* Write out summary information - called from jffs2_do_reserve_space */ 848 849 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c) 850 __must_hold(&c->erase_completion_block) 851 { 852 int datasize, infosize, padsize; 853 struct jffs2_eraseblock *jeb; 854 int ret = 0; 855 856 dbg_summary("called\n"); 857 858 spin_unlock(&c->erase_completion_lock); 859 860 jeb = c->nextblock; 861 jffs2_prealloc_raw_node_refs(c, jeb, 1); 862 863 if (!c->summary->sum_num || !c->summary->sum_list_head) { 864 JFFS2_WARNING("Empty summary info!!!\n"); 865 BUG(); 866 } 867 868 datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker); 869 infosize = sizeof(struct jffs2_raw_summary) + datasize; 870 padsize = jeb->free_size - infosize; 871 infosize += padsize; 872 datasize += padsize; 873 874 ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize); 875 spin_lock(&c->erase_completion_lock); 876 return ret; 877 } 878