1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright (C) 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 * 2005 KaiGai Kohei <kaigai@ak.jp.nec.com> 9 * 10 * For licensing information, see the file 'LICENCE' in this directory. 11 * 12 * $Id: summary.c,v 1.4 2005/09/26 11:37:21 havasi Exp $ 13 * 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/sched.h> 18 #include <linux/slab.h> 19 #include <linux/mtd/mtd.h> 20 #include <linux/pagemap.h> 21 #include <linux/crc32.h> 22 #include <linux/compiler.h> 23 #include <linux/vmalloc.h> 24 #include "nodelist.h" 25 #include "debug.h" 26 27 int jffs2_sum_init(struct jffs2_sb_info *c) 28 { 29 c->summary = kmalloc(sizeof(struct jffs2_summary), GFP_KERNEL); 30 31 if (!c->summary) { 32 JFFS2_WARNING("Can't allocate memory for summary information!\n"); 33 return -ENOMEM; 34 } 35 36 memset(c->summary, 0, sizeof(struct jffs2_summary)); 37 38 c->summary->sum_buf = vmalloc(c->sector_size); 39 40 if (!c->summary->sum_buf) { 41 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n"); 42 kfree(c->summary); 43 return -ENOMEM; 44 } 45 46 dbg_summary("returned succesfully\n"); 47 48 return 0; 49 } 50 51 void jffs2_sum_exit(struct jffs2_sb_info *c) 52 { 53 dbg_summary("called\n"); 54 55 jffs2_sum_disable_collecting(c->summary); 56 57 vfree(c->summary->sum_buf); 58 c->summary->sum_buf = NULL; 59 60 kfree(c->summary); 61 c->summary = NULL; 62 } 63 64 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item) 65 { 66 if (!s->sum_list_head) 67 s->sum_list_head = (union jffs2_sum_mem *) item; 68 if (s->sum_list_tail) 69 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item; 70 s->sum_list_tail = (union jffs2_sum_mem *) item; 71 72 switch (je16_to_cpu(item->u.nodetype)) { 73 case JFFS2_NODETYPE_INODE: 74 s->sum_size += JFFS2_SUMMARY_INODE_SIZE; 75 s->sum_num++; 76 dbg_summary("inode (%u) added to summary\n", 77 je32_to_cpu(item->i.inode)); 78 break; 79 case JFFS2_NODETYPE_DIRENT: 80 s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize); 81 s->sum_num++; 82 dbg_summary("dirent (%u) added to summary\n", 83 je32_to_cpu(item->d.ino)); 84 break; 85 #ifdef CONFIG_JFFS2_FS_XATTR 86 case JFFS2_NODETYPE_XATTR: 87 s->sum_size += JFFS2_SUMMARY_XATTR_SIZE; 88 s->sum_num++; 89 dbg_summary("xattr (xid=%u, version=%u) added to summary\n", 90 je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version)); 91 break; 92 case JFFS2_NODETYPE_XREF: 93 s->sum_size += JFFS2_SUMMARY_XREF_SIZE; 94 s->sum_num++; 95 dbg_summary("xref added to summary\n"); 96 break; 97 #endif 98 default: 99 JFFS2_WARNING("UNKNOWN node type %u\n", 100 je16_to_cpu(item->u.nodetype)); 101 return 1; 102 } 103 return 0; 104 } 105 106 107 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */ 108 109 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size) 110 { 111 dbg_summary("called with %u\n", size); 112 s->sum_padded += size; 113 return 0; 114 } 115 116 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, 117 uint32_t ofs) 118 { 119 struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); 120 121 if (!temp) 122 return -ENOMEM; 123 124 temp->nodetype = ri->nodetype; 125 temp->inode = ri->ino; 126 temp->version = ri->version; 127 temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */ 128 temp->totlen = ri->totlen; 129 temp->next = NULL; 130 131 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 132 } 133 134 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, 135 uint32_t ofs) 136 { 137 struct jffs2_sum_dirent_mem *temp = 138 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL); 139 140 if (!temp) 141 return -ENOMEM; 142 143 temp->nodetype = rd->nodetype; 144 temp->totlen = rd->totlen; 145 temp->offset = cpu_to_je32(ofs); /* relative from the begining of the jeb */ 146 temp->pino = rd->pino; 147 temp->version = rd->version; 148 temp->ino = rd->ino; 149 temp->nsize = rd->nsize; 150 temp->type = rd->type; 151 temp->next = NULL; 152 153 memcpy(temp->name, rd->name, rd->nsize); 154 155 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 156 } 157 158 #ifdef CONFIG_JFFS2_FS_XATTR 159 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs) 160 { 161 struct jffs2_sum_xattr_mem *temp; 162 163 temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL); 164 if (!temp) 165 return -ENOMEM; 166 167 temp->nodetype = rx->nodetype; 168 temp->xid = rx->xid; 169 temp->version = rx->version; 170 temp->offset = cpu_to_je32(ofs); 171 temp->totlen = rx->totlen; 172 temp->next = NULL; 173 174 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 175 } 176 177 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs) 178 { 179 struct jffs2_sum_xref_mem *temp; 180 181 temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL); 182 if (!temp) 183 return -ENOMEM; 184 185 temp->nodetype = rr->nodetype; 186 temp->offset = cpu_to_je32(ofs); 187 temp->next = NULL; 188 189 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 190 } 191 #endif 192 /* Cleanup every collected summary information */ 193 194 static void jffs2_sum_clean_collected(struct jffs2_summary *s) 195 { 196 union jffs2_sum_mem *temp; 197 198 if (!s->sum_list_head) { 199 dbg_summary("already empty\n"); 200 } 201 while (s->sum_list_head) { 202 temp = s->sum_list_head; 203 s->sum_list_head = s->sum_list_head->u.next; 204 kfree(temp); 205 } 206 s->sum_list_tail = NULL; 207 s->sum_padded = 0; 208 s->sum_num = 0; 209 } 210 211 void jffs2_sum_reset_collected(struct jffs2_summary *s) 212 { 213 dbg_summary("called\n"); 214 jffs2_sum_clean_collected(s); 215 s->sum_size = 0; 216 } 217 218 void jffs2_sum_disable_collecting(struct jffs2_summary *s) 219 { 220 dbg_summary("called\n"); 221 jffs2_sum_clean_collected(s); 222 s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; 223 } 224 225 int jffs2_sum_is_disabled(struct jffs2_summary *s) 226 { 227 return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE); 228 } 229 230 /* Move the collected summary information into sb (called from scan.c) */ 231 232 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s) 233 { 234 dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n", 235 c->summary->sum_size, c->summary->sum_num, 236 s->sum_size, s->sum_num); 237 238 c->summary->sum_size = s->sum_size; 239 c->summary->sum_num = s->sum_num; 240 c->summary->sum_padded = s->sum_padded; 241 c->summary->sum_list_head = s->sum_list_head; 242 c->summary->sum_list_tail = s->sum_list_tail; 243 244 s->sum_list_head = s->sum_list_tail = NULL; 245 } 246 247 /* Called from wbuf.c to collect writed node info */ 248 249 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs, 250 unsigned long count, uint32_t ofs) 251 { 252 union jffs2_node_union *node; 253 struct jffs2_eraseblock *jeb; 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 /* Make sure there's a spare ref for dirty space */ 397 err = jffs2_prealloc_raw_node_refs(c, jeb, 2); 398 if (err) 399 return err; 400 401 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) { 402 case JFFS2_NODETYPE_INODE: { 403 struct jffs2_sum_inode_flash *spi; 404 spi = sp; 405 406 ino = je32_to_cpu(spi->inode); 407 408 dbg_summary("Inode at 0x%08x-0x%08x\n", 409 jeb->offset + je32_to_cpu(spi->offset), 410 jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen)); 411 412 ic = jffs2_scan_make_ino_cache(c, ino); 413 if (!ic) { 414 JFFS2_NOTICE("scan_make_ino_cache failed\n"); 415 return -ENOMEM; 416 } 417 418 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED, 419 PAD(je32_to_cpu(spi->totlen)), ic); 420 421 *pseudo_random += je32_to_cpu(spi->version); 422 423 sp += JFFS2_SUMMARY_INODE_SIZE; 424 425 break; 426 } 427 428 case JFFS2_NODETYPE_DIRENT: { 429 struct jffs2_sum_dirent_flash *spd; 430 spd = sp; 431 432 dbg_summary("Dirent at 0x%08x-0x%08x\n", 433 jeb->offset + je32_to_cpu(spd->offset), 434 jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen)); 435 436 437 fd = jffs2_alloc_full_dirent(spd->nsize+1); 438 if (!fd) 439 return -ENOMEM; 440 441 memcpy(&fd->name, spd->name, spd->nsize); 442 fd->name[spd->nsize] = 0; 443 444 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino)); 445 if (!ic) { 446 jffs2_free_full_dirent(fd); 447 return -ENOMEM; 448 } 449 450 fd->raw = sum_link_node_ref(c, jeb, je32_to_cpu(spd->offset) | REF_UNCHECKED, 451 PAD(je32_to_cpu(spd->totlen)), ic); 452 453 fd->next = NULL; 454 fd->version = je32_to_cpu(spd->version); 455 fd->ino = je32_to_cpu(spd->ino); 456 fd->nhash = full_name_hash(fd->name, spd->nsize); 457 fd->type = spd->type; 458 459 jffs2_add_fd_to_list(c, fd, &ic->scan_dents); 460 461 *pseudo_random += je32_to_cpu(spd->version); 462 463 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize); 464 465 break; 466 } 467 #ifdef CONFIG_JFFS2_FS_XATTR 468 case JFFS2_NODETYPE_XATTR: { 469 struct jffs2_xattr_datum *xd; 470 struct jffs2_sum_xattr_flash *spx; 471 472 spx = (struct jffs2_sum_xattr_flash *)sp; 473 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", 474 jeb->offset + je32_to_cpu(spx->offset), 475 jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen), 476 je32_to_cpu(spx->xid), je32_to_cpu(spx->version)); 477 478 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid), 479 je32_to_cpu(spx->version)); 480 if (IS_ERR(xd)) 481 return PTR_ERR(xd); 482 if (xd->version > je32_to_cpu(spx->version)) { 483 /* node is not the newest one */ 484 struct jffs2_raw_node_ref *raw 485 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, 486 PAD(je32_to_cpu(spx->totlen)), NULL); 487 raw->next_in_ino = xd->node->next_in_ino; 488 xd->node->next_in_ino = raw; 489 } else { 490 xd->version = je32_to_cpu(spx->version); 491 sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, 492 PAD(je32_to_cpu(spx->totlen)), (void *)xd); 493 } 494 *pseudo_random += je32_to_cpu(spx->xid); 495 sp += JFFS2_SUMMARY_XATTR_SIZE; 496 497 break; 498 } 499 case JFFS2_NODETYPE_XREF: { 500 struct jffs2_xattr_ref *ref; 501 struct jffs2_sum_xref_flash *spr; 502 503 spr = (struct jffs2_sum_xref_flash *)sp; 504 dbg_summary("xref at %#08x-%#08x\n", 505 jeb->offset + je32_to_cpu(spr->offset), 506 jeb->offset + je32_to_cpu(spr->offset) + 507 (uint32_t)PAD(sizeof(struct jffs2_raw_xref))); 508 509 ref = jffs2_alloc_xattr_ref(); 510 if (!ref) { 511 JFFS2_NOTICE("allocation of xattr_datum failed\n"); 512 return -ENOMEM; 513 } 514 ref->next = c->xref_temp; 515 c->xref_temp = ref; 516 517 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED, 518 PAD(sizeof(struct jffs2_raw_xref)), (void *)ref); 519 520 *pseudo_random += ref->node->flash_offset; 521 sp += JFFS2_SUMMARY_XREF_SIZE; 522 523 break; 524 } 525 #endif 526 default : { 527 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype); 528 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype); 529 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT) 530 return -EIO; 531 532 /* For compatible node types, just fall back to the full scan */ 533 c->wasted_size -= jeb->wasted_size; 534 c->free_size += c->sector_size - jeb->free_size; 535 c->used_size -= jeb->used_size; 536 c->dirty_size -= jeb->dirty_size; 537 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0; 538 jeb->free_size = c->sector_size; 539 540 jffs2_free_jeb_node_refs(c, jeb); 541 return -ENOTRECOVERABLE; 542 } 543 } 544 } 545 return 0; 546 } 547 548 /* Process the summary node - called from jffs2_scan_eraseblock() */ 549 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 550 struct jffs2_raw_summary *summary, uint32_t sumsize, 551 uint32_t *pseudo_random) 552 { 553 struct jffs2_unknown_node crcnode; 554 int ret, ofs; 555 uint32_t crc; 556 557 ofs = c->sector_size - sumsize; 558 559 dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n", 560 jeb->offset, jeb->offset + ofs, sumsize); 561 562 /* OK, now check for node validity and CRC */ 563 crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 564 crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 565 crcnode.totlen = summary->totlen; 566 crc = crc32(0, &crcnode, sizeof(crcnode)-4); 567 568 if (je32_to_cpu(summary->hdr_crc) != crc) { 569 dbg_summary("Summary node header is corrupt (bad CRC or " 570 "no summary at all)\n"); 571 goto crc_err; 572 } 573 574 if (je32_to_cpu(summary->totlen) != sumsize) { 575 dbg_summary("Summary node is corrupt (wrong erasesize?)\n"); 576 goto crc_err; 577 } 578 579 crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8); 580 581 if (je32_to_cpu(summary->node_crc) != crc) { 582 dbg_summary("Summary node is corrupt (bad CRC)\n"); 583 goto crc_err; 584 } 585 586 crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary)); 587 588 if (je32_to_cpu(summary->sum_crc) != crc) { 589 dbg_summary("Summary node data is corrupt (bad CRC)\n"); 590 goto crc_err; 591 } 592 593 if ( je32_to_cpu(summary->cln_mkr) ) { 594 595 dbg_summary("Summary : CLEANMARKER node \n"); 596 597 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1); 598 if (ret) 599 return ret; 600 601 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) { 602 dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n", 603 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size); 604 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) 605 return ret; 606 } else if (jeb->first_node) { 607 dbg_summary("CLEANMARKER node not first node in block " 608 "(0x%08x)\n", jeb->offset); 609 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) 610 return ret; 611 } else { 612 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, 613 je32_to_cpu(summary->cln_mkr), NULL); 614 } 615 } 616 617 ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random); 618 /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full 619 scan of this eraseblock. So return zero */ 620 if (ret == -ENOTRECOVERABLE) 621 return 0; 622 if (ret) 623 return ret; /* real error */ 624 625 /* for PARANOIA_CHECK */ 626 ret = jffs2_prealloc_raw_node_refs(c, jeb, 2); 627 if (ret) 628 return ret; 629 630 sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL); 631 632 if (unlikely(jeb->free_size)) { 633 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n", 634 jeb->free_size, jeb->offset); 635 jeb->wasted_size += jeb->free_size; 636 c->wasted_size += jeb->free_size; 637 c->free_size -= jeb->free_size; 638 jeb->free_size = 0; 639 } 640 641 return jffs2_scan_classify_jeb(c, jeb); 642 643 crc_err: 644 JFFS2_WARNING("Summary node crc error, skipping summary information.\n"); 645 646 return 0; 647 } 648 649 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */ 650 651 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 652 uint32_t infosize, uint32_t datasize, int padsize) 653 { 654 struct jffs2_raw_summary isum; 655 union jffs2_sum_mem *temp; 656 struct jffs2_sum_marker *sm; 657 struct kvec vecs[2]; 658 uint32_t sum_ofs; 659 void *wpage; 660 int ret; 661 size_t retlen; 662 663 memset(c->summary->sum_buf, 0xff, datasize); 664 memset(&isum, 0, sizeof(isum)); 665 666 isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 667 isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 668 isum.totlen = cpu_to_je32(infosize); 669 isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4)); 670 isum.padded = cpu_to_je32(c->summary->sum_padded); 671 isum.cln_mkr = cpu_to_je32(c->cleanmarker_size); 672 isum.sum_num = cpu_to_je32(c->summary->sum_num); 673 wpage = c->summary->sum_buf; 674 675 while (c->summary->sum_num) { 676 temp = c->summary->sum_list_head; 677 678 switch (je16_to_cpu(temp->u.nodetype)) { 679 case JFFS2_NODETYPE_INODE: { 680 struct jffs2_sum_inode_flash *sino_ptr = wpage; 681 682 sino_ptr->nodetype = temp->i.nodetype; 683 sino_ptr->inode = temp->i.inode; 684 sino_ptr->version = temp->i.version; 685 sino_ptr->offset = temp->i.offset; 686 sino_ptr->totlen = temp->i.totlen; 687 688 wpage += JFFS2_SUMMARY_INODE_SIZE; 689 690 break; 691 } 692 693 case JFFS2_NODETYPE_DIRENT: { 694 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage; 695 696 sdrnt_ptr->nodetype = temp->d.nodetype; 697 sdrnt_ptr->totlen = temp->d.totlen; 698 sdrnt_ptr->offset = temp->d.offset; 699 sdrnt_ptr->pino = temp->d.pino; 700 sdrnt_ptr->version = temp->d.version; 701 sdrnt_ptr->ino = temp->d.ino; 702 sdrnt_ptr->nsize = temp->d.nsize; 703 sdrnt_ptr->type = temp->d.type; 704 705 memcpy(sdrnt_ptr->name, temp->d.name, 706 temp->d.nsize); 707 708 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize); 709 710 break; 711 } 712 #ifdef CONFIG_JFFS2_FS_XATTR 713 case JFFS2_NODETYPE_XATTR: { 714 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage; 715 716 temp = c->summary->sum_list_head; 717 sxattr_ptr->nodetype = temp->x.nodetype; 718 sxattr_ptr->xid = temp->x.xid; 719 sxattr_ptr->version = temp->x.version; 720 sxattr_ptr->offset = temp->x.offset; 721 sxattr_ptr->totlen = temp->x.totlen; 722 723 wpage += JFFS2_SUMMARY_XATTR_SIZE; 724 break; 725 } 726 case JFFS2_NODETYPE_XREF: { 727 struct jffs2_sum_xref_flash *sxref_ptr = wpage; 728 729 temp = c->summary->sum_list_head; 730 sxref_ptr->nodetype = temp->r.nodetype; 731 sxref_ptr->offset = temp->r.offset; 732 733 wpage += JFFS2_SUMMARY_XREF_SIZE; 734 break; 735 } 736 #endif 737 default : { 738 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK) 739 == JFFS2_FEATURE_RWCOMPAT_COPY) { 740 dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n", 741 je16_to_cpu(temp->u.nodetype)); 742 jffs2_sum_disable_collecting(c->summary); 743 } else { 744 BUG(); /* unknown node in summary information */ 745 } 746 } 747 } 748 749 c->summary->sum_list_head = temp->u.next; 750 kfree(temp); 751 752 c->summary->sum_num--; 753 } 754 755 jffs2_sum_reset_collected(c->summary); 756 757 wpage += padsize; 758 759 sm = wpage; 760 sm->offset = cpu_to_je32(c->sector_size - jeb->free_size); 761 sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC); 762 763 isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize)); 764 isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8)); 765 766 vecs[0].iov_base = &isum; 767 vecs[0].iov_len = sizeof(isum); 768 vecs[1].iov_base = c->summary->sum_buf; 769 vecs[1].iov_len = datasize; 770 771 sum_ofs = jeb->offset + c->sector_size - jeb->free_size; 772 773 dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n", 774 sum_ofs); 775 776 ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0); 777 778 if (ret || (retlen != infosize)) { 779 780 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n", 781 infosize, sum_ofs, ret, retlen); 782 783 if (retlen) { 784 /* Waste remaining space */ 785 spin_lock(&c->erase_completion_lock); 786 jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL); 787 spin_unlock(&c->erase_completion_lock); 788 } 789 790 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; 791 792 return 0; 793 } 794 795 spin_lock(&c->erase_completion_lock); 796 jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL); 797 spin_unlock(&c->erase_completion_lock); 798 799 return 0; 800 } 801 802 /* Write out summary information - called from jffs2_do_reserve_space */ 803 804 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c) 805 { 806 int datasize, infosize, padsize; 807 struct jffs2_eraseblock *jeb; 808 int ret; 809 810 dbg_summary("called\n"); 811 812 spin_unlock(&c->erase_completion_lock); 813 814 jeb = c->nextblock; 815 jffs2_prealloc_raw_node_refs(c, jeb, 1); 816 817 if (!c->summary->sum_num || !c->summary->sum_list_head) { 818 JFFS2_WARNING("Empty summary info!!!\n"); 819 BUG(); 820 } 821 822 datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker); 823 infosize = sizeof(struct jffs2_raw_summary) + datasize; 824 padsize = jeb->free_size - infosize; 825 infosize += padsize; 826 datasize += padsize; 827 828 /* Is there enough space for summary? */ 829 if (padsize < 0) { 830 /* don't try to write out summary for this jeb */ 831 jffs2_sum_disable_collecting(c->summary); 832 833 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize); 834 spin_lock(&c->erase_completion_lock); 835 return 0; 836 } 837 838 ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize); 839 spin_lock(&c->erase_completion_lock); 840 return ret; 841 } 842