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 * 2006 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 successfully\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 if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) { 256 dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n"); 257 return 0; 258 } 259 260 node = invecs[0].iov_base; 261 jeb = &c->blocks[ofs / c->sector_size]; 262 ofs -= jeb->offset; 263 264 switch (je16_to_cpu(node->u.nodetype)) { 265 case JFFS2_NODETYPE_INODE: { 266 struct jffs2_sum_inode_mem *temp = 267 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); 268 269 if (!temp) 270 goto no_mem; 271 272 temp->nodetype = node->i.nodetype; 273 temp->inode = node->i.ino; 274 temp->version = node->i.version; 275 temp->offset = cpu_to_je32(ofs); 276 temp->totlen = node->i.totlen; 277 temp->next = NULL; 278 279 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 280 } 281 282 case JFFS2_NODETYPE_DIRENT: { 283 struct jffs2_sum_dirent_mem *temp = 284 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL); 285 286 if (!temp) 287 goto no_mem; 288 289 temp->nodetype = node->d.nodetype; 290 temp->totlen = node->d.totlen; 291 temp->offset = cpu_to_je32(ofs); 292 temp->pino = node->d.pino; 293 temp->version = node->d.version; 294 temp->ino = node->d.ino; 295 temp->nsize = node->d.nsize; 296 temp->type = node->d.type; 297 temp->next = NULL; 298 299 switch (count) { 300 case 1: 301 memcpy(temp->name,node->d.name,node->d.nsize); 302 break; 303 304 case 2: 305 memcpy(temp->name,invecs[1].iov_base,node->d.nsize); 306 break; 307 308 default: 309 BUG(); /* impossible count value */ 310 break; 311 } 312 313 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 314 } 315 #ifdef CONFIG_JFFS2_FS_XATTR 316 case JFFS2_NODETYPE_XATTR: { 317 struct jffs2_sum_xattr_mem *temp; 318 temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL); 319 if (!temp) 320 goto no_mem; 321 322 temp->nodetype = node->x.nodetype; 323 temp->xid = node->x.xid; 324 temp->version = node->x.version; 325 temp->totlen = node->x.totlen; 326 temp->offset = cpu_to_je32(ofs); 327 temp->next = NULL; 328 329 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 330 } 331 case JFFS2_NODETYPE_XREF: { 332 struct jffs2_sum_xref_mem *temp; 333 temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL); 334 if (!temp) 335 goto no_mem; 336 temp->nodetype = node->r.nodetype; 337 temp->offset = cpu_to_je32(ofs); 338 temp->next = NULL; 339 340 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 341 } 342 #endif 343 case JFFS2_NODETYPE_PADDING: 344 dbg_summary("node PADDING\n"); 345 c->summary->sum_padded += je32_to_cpu(node->u.totlen); 346 break; 347 348 case JFFS2_NODETYPE_CLEANMARKER: 349 dbg_summary("node CLEANMARKER\n"); 350 break; 351 352 case JFFS2_NODETYPE_SUMMARY: 353 dbg_summary("node SUMMARY\n"); 354 break; 355 356 default: 357 /* If you implement a new node type you should also implement 358 summary support for it or disable summary. 359 */ 360 BUG(); 361 break; 362 } 363 364 return 0; 365 366 no_mem: 367 JFFS2_WARNING("MEMORY ALLOCATION ERROR!"); 368 return -ENOMEM; 369 } 370 371 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c, 372 struct jffs2_eraseblock *jeb, 373 uint32_t ofs, uint32_t len, 374 struct jffs2_inode_cache *ic) 375 { 376 /* If there was a gap, mark it dirty */ 377 if ((ofs & ~3) > c->sector_size - jeb->free_size) { 378 /* Ew. Summary doesn't actually tell us explicitly about dirty space */ 379 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size)); 380 } 381 382 return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic); 383 } 384 385 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */ 386 387 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 388 struct jffs2_raw_summary *summary, uint32_t *pseudo_random) 389 { 390 struct jffs2_inode_cache *ic; 391 struct jffs2_full_dirent *fd; 392 void *sp; 393 int i, ino; 394 int err; 395 396 sp = summary->sum; 397 398 for (i=0; i<je32_to_cpu(summary->sum_num); i++) { 399 dbg_summary("processing summary index %d\n", i); 400 401 /* Make sure there's a spare ref for dirty space */ 402 err = jffs2_prealloc_raw_node_refs(c, jeb, 2); 403 if (err) 404 return err; 405 406 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) { 407 case JFFS2_NODETYPE_INODE: { 408 struct jffs2_sum_inode_flash *spi; 409 spi = sp; 410 411 ino = je32_to_cpu(spi->inode); 412 413 dbg_summary("Inode at 0x%08x-0x%08x\n", 414 jeb->offset + je32_to_cpu(spi->offset), 415 jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen)); 416 417 ic = jffs2_scan_make_ino_cache(c, ino); 418 if (!ic) { 419 JFFS2_NOTICE("scan_make_ino_cache failed\n"); 420 return -ENOMEM; 421 } 422 423 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED, 424 PAD(je32_to_cpu(spi->totlen)), ic); 425 426 *pseudo_random += je32_to_cpu(spi->version); 427 428 sp += JFFS2_SUMMARY_INODE_SIZE; 429 430 break; 431 } 432 433 case JFFS2_NODETYPE_DIRENT: { 434 struct jffs2_sum_dirent_flash *spd; 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 fd = jffs2_alloc_full_dirent(spd->nsize+1); 443 if (!fd) 444 return -ENOMEM; 445 446 memcpy(&fd->name, spd->name, spd->nsize); 447 fd->name[spd->nsize] = 0; 448 449 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino)); 450 if (!ic) { 451 jffs2_free_full_dirent(fd); 452 return -ENOMEM; 453 } 454 455 fd->raw = sum_link_node_ref(c, jeb, je32_to_cpu(spd->offset) | REF_UNCHECKED, 456 PAD(je32_to_cpu(spd->totlen)), ic); 457 458 fd->next = NULL; 459 fd->version = je32_to_cpu(spd->version); 460 fd->ino = je32_to_cpu(spd->ino); 461 fd->nhash = full_name_hash(fd->name, spd->nsize); 462 fd->type = spd->type; 463 464 jffs2_add_fd_to_list(c, fd, &ic->scan_dents); 465 466 *pseudo_random += je32_to_cpu(spd->version); 467 468 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize); 469 470 break; 471 } 472 #ifdef CONFIG_JFFS2_FS_XATTR 473 case JFFS2_NODETYPE_XATTR: { 474 struct jffs2_xattr_datum *xd; 475 struct jffs2_sum_xattr_flash *spx; 476 477 spx = (struct jffs2_sum_xattr_flash *)sp; 478 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", 479 jeb->offset + je32_to_cpu(spx->offset), 480 jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen), 481 je32_to_cpu(spx->xid), je32_to_cpu(spx->version)); 482 483 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid), 484 je32_to_cpu(spx->version)); 485 if (IS_ERR(xd)) 486 return PTR_ERR(xd); 487 if (xd->version > je32_to_cpu(spx->version)) { 488 /* node is not the newest one */ 489 struct jffs2_raw_node_ref *raw 490 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, 491 PAD(je32_to_cpu(spx->totlen)), NULL); 492 raw->next_in_ino = xd->node->next_in_ino; 493 xd->node->next_in_ino = raw; 494 } else { 495 xd->version = je32_to_cpu(spx->version); 496 sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, 497 PAD(je32_to_cpu(spx->totlen)), (void *)xd); 498 } 499 *pseudo_random += je32_to_cpu(spx->xid); 500 sp += JFFS2_SUMMARY_XATTR_SIZE; 501 502 break; 503 } 504 case JFFS2_NODETYPE_XREF: { 505 struct jffs2_xattr_ref *ref; 506 struct jffs2_sum_xref_flash *spr; 507 508 spr = (struct jffs2_sum_xref_flash *)sp; 509 dbg_summary("xref at %#08x-%#08x\n", 510 jeb->offset + je32_to_cpu(spr->offset), 511 jeb->offset + je32_to_cpu(spr->offset) + 512 (uint32_t)PAD(sizeof(struct jffs2_raw_xref))); 513 514 ref = jffs2_alloc_xattr_ref(); 515 if (!ref) { 516 JFFS2_NOTICE("allocation of xattr_datum failed\n"); 517 return -ENOMEM; 518 } 519 ref->next = c->xref_temp; 520 c->xref_temp = ref; 521 522 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED, 523 PAD(sizeof(struct jffs2_raw_xref)), (void *)ref); 524 525 *pseudo_random += ref->node->flash_offset; 526 sp += JFFS2_SUMMARY_XREF_SIZE; 527 528 break; 529 } 530 #endif 531 default : { 532 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype); 533 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype); 534 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT) 535 return -EIO; 536 537 /* For compatible node types, just fall back to the full scan */ 538 c->wasted_size -= jeb->wasted_size; 539 c->free_size += c->sector_size - jeb->free_size; 540 c->used_size -= jeb->used_size; 541 c->dirty_size -= jeb->dirty_size; 542 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0; 543 jeb->free_size = c->sector_size; 544 545 jffs2_free_jeb_node_refs(c, jeb); 546 return -ENOTRECOVERABLE; 547 } 548 } 549 } 550 return 0; 551 } 552 553 /* Process the summary node - called from jffs2_scan_eraseblock() */ 554 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 555 struct jffs2_raw_summary *summary, uint32_t sumsize, 556 uint32_t *pseudo_random) 557 { 558 struct jffs2_unknown_node crcnode; 559 int ret, ofs; 560 uint32_t crc; 561 562 ofs = c->sector_size - sumsize; 563 564 dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n", 565 jeb->offset, jeb->offset + ofs, sumsize); 566 567 /* OK, now check for node validity and CRC */ 568 crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 569 crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 570 crcnode.totlen = summary->totlen; 571 crc = crc32(0, &crcnode, sizeof(crcnode)-4); 572 573 if (je32_to_cpu(summary->hdr_crc) != crc) { 574 dbg_summary("Summary node header is corrupt (bad CRC or " 575 "no summary at all)\n"); 576 goto crc_err; 577 } 578 579 if (je32_to_cpu(summary->totlen) != sumsize) { 580 dbg_summary("Summary node is corrupt (wrong erasesize?)\n"); 581 goto crc_err; 582 } 583 584 crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8); 585 586 if (je32_to_cpu(summary->node_crc) != crc) { 587 dbg_summary("Summary node is corrupt (bad CRC)\n"); 588 goto crc_err; 589 } 590 591 crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary)); 592 593 if (je32_to_cpu(summary->sum_crc) != crc) { 594 dbg_summary("Summary node data is corrupt (bad CRC)\n"); 595 goto crc_err; 596 } 597 598 if ( je32_to_cpu(summary->cln_mkr) ) { 599 600 dbg_summary("Summary : CLEANMARKER node \n"); 601 602 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1); 603 if (ret) 604 return ret; 605 606 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) { 607 dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n", 608 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size); 609 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) 610 return ret; 611 } else if (jeb->first_node) { 612 dbg_summary("CLEANMARKER node not first node in block " 613 "(0x%08x)\n", jeb->offset); 614 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) 615 return ret; 616 } else { 617 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, 618 je32_to_cpu(summary->cln_mkr), NULL); 619 } 620 } 621 622 ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random); 623 /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full 624 scan of this eraseblock. So return zero */ 625 if (ret == -ENOTRECOVERABLE) 626 return 0; 627 if (ret) 628 return ret; /* real error */ 629 630 /* for PARANOIA_CHECK */ 631 ret = jffs2_prealloc_raw_node_refs(c, jeb, 2); 632 if (ret) 633 return ret; 634 635 sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL); 636 637 if (unlikely(jeb->free_size)) { 638 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n", 639 jeb->free_size, jeb->offset); 640 jeb->wasted_size += jeb->free_size; 641 c->wasted_size += jeb->free_size; 642 c->free_size -= jeb->free_size; 643 jeb->free_size = 0; 644 } 645 646 return jffs2_scan_classify_jeb(c, jeb); 647 648 crc_err: 649 JFFS2_WARNING("Summary node crc error, skipping summary information.\n"); 650 651 return 0; 652 } 653 654 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */ 655 656 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 657 uint32_t infosize, uint32_t datasize, int padsize) 658 { 659 struct jffs2_raw_summary isum; 660 union jffs2_sum_mem *temp; 661 struct jffs2_sum_marker *sm; 662 struct kvec vecs[2]; 663 uint32_t sum_ofs; 664 void *wpage; 665 int ret; 666 size_t retlen; 667 668 memset(c->summary->sum_buf, 0xff, datasize); 669 memset(&isum, 0, sizeof(isum)); 670 671 isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 672 isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 673 isum.totlen = cpu_to_je32(infosize); 674 isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4)); 675 isum.padded = cpu_to_je32(c->summary->sum_padded); 676 isum.cln_mkr = cpu_to_je32(c->cleanmarker_size); 677 isum.sum_num = cpu_to_je32(c->summary->sum_num); 678 wpage = c->summary->sum_buf; 679 680 while (c->summary->sum_num) { 681 temp = c->summary->sum_list_head; 682 683 switch (je16_to_cpu(temp->u.nodetype)) { 684 case JFFS2_NODETYPE_INODE: { 685 struct jffs2_sum_inode_flash *sino_ptr = wpage; 686 687 sino_ptr->nodetype = temp->i.nodetype; 688 sino_ptr->inode = temp->i.inode; 689 sino_ptr->version = temp->i.version; 690 sino_ptr->offset = temp->i.offset; 691 sino_ptr->totlen = temp->i.totlen; 692 693 wpage += JFFS2_SUMMARY_INODE_SIZE; 694 695 break; 696 } 697 698 case JFFS2_NODETYPE_DIRENT: { 699 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage; 700 701 sdrnt_ptr->nodetype = temp->d.nodetype; 702 sdrnt_ptr->totlen = temp->d.totlen; 703 sdrnt_ptr->offset = temp->d.offset; 704 sdrnt_ptr->pino = temp->d.pino; 705 sdrnt_ptr->version = temp->d.version; 706 sdrnt_ptr->ino = temp->d.ino; 707 sdrnt_ptr->nsize = temp->d.nsize; 708 sdrnt_ptr->type = temp->d.type; 709 710 memcpy(sdrnt_ptr->name, temp->d.name, 711 temp->d.nsize); 712 713 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize); 714 715 break; 716 } 717 #ifdef CONFIG_JFFS2_FS_XATTR 718 case JFFS2_NODETYPE_XATTR: { 719 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage; 720 721 temp = c->summary->sum_list_head; 722 sxattr_ptr->nodetype = temp->x.nodetype; 723 sxattr_ptr->xid = temp->x.xid; 724 sxattr_ptr->version = temp->x.version; 725 sxattr_ptr->offset = temp->x.offset; 726 sxattr_ptr->totlen = temp->x.totlen; 727 728 wpage += JFFS2_SUMMARY_XATTR_SIZE; 729 break; 730 } 731 case JFFS2_NODETYPE_XREF: { 732 struct jffs2_sum_xref_flash *sxref_ptr = wpage; 733 734 temp = c->summary->sum_list_head; 735 sxref_ptr->nodetype = temp->r.nodetype; 736 sxref_ptr->offset = temp->r.offset; 737 738 wpage += JFFS2_SUMMARY_XREF_SIZE; 739 break; 740 } 741 #endif 742 default : { 743 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK) 744 == JFFS2_FEATURE_RWCOMPAT_COPY) { 745 dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n", 746 je16_to_cpu(temp->u.nodetype)); 747 jffs2_sum_disable_collecting(c->summary); 748 } else { 749 BUG(); /* unknown node in summary information */ 750 } 751 } 752 } 753 754 c->summary->sum_list_head = temp->u.next; 755 kfree(temp); 756 757 c->summary->sum_num--; 758 } 759 760 jffs2_sum_reset_collected(c->summary); 761 762 wpage += padsize; 763 764 sm = wpage; 765 sm->offset = cpu_to_je32(c->sector_size - jeb->free_size); 766 sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC); 767 768 isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize)); 769 isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8)); 770 771 vecs[0].iov_base = &isum; 772 vecs[0].iov_len = sizeof(isum); 773 vecs[1].iov_base = c->summary->sum_buf; 774 vecs[1].iov_len = datasize; 775 776 sum_ofs = jeb->offset + c->sector_size - jeb->free_size; 777 778 dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n", 779 sum_ofs); 780 781 ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0); 782 783 if (ret || (retlen != infosize)) { 784 785 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n", 786 infosize, sum_ofs, ret, retlen); 787 788 if (retlen) { 789 /* Waste remaining space */ 790 spin_lock(&c->erase_completion_lock); 791 jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL); 792 spin_unlock(&c->erase_completion_lock); 793 } 794 795 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; 796 797 return 0; 798 } 799 800 spin_lock(&c->erase_completion_lock); 801 jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL); 802 spin_unlock(&c->erase_completion_lock); 803 804 return 0; 805 } 806 807 /* Write out summary information - called from jffs2_do_reserve_space */ 808 809 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c) 810 { 811 int datasize, infosize, padsize; 812 struct jffs2_eraseblock *jeb; 813 int ret; 814 815 dbg_summary("called\n"); 816 817 spin_unlock(&c->erase_completion_lock); 818 819 jeb = c->nextblock; 820 jffs2_prealloc_raw_node_refs(c, jeb, 1); 821 822 if (!c->summary->sum_num || !c->summary->sum_list_head) { 823 JFFS2_WARNING("Empty summary info!!!\n"); 824 BUG(); 825 } 826 827 datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker); 828 infosize = sizeof(struct jffs2_raw_summary) + datasize; 829 padsize = jeb->free_size - infosize; 830 infosize += padsize; 831 datasize += padsize; 832 833 /* Is there enough space for summary? */ 834 if (padsize < 0) { 835 /* don't try to write out summary for this jeb */ 836 jffs2_sum_disable_collecting(c->summary); 837 838 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize); 839 spin_lock(&c->erase_completion_lock); 840 return 0; 841 } 842 843 ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize); 844 spin_lock(&c->erase_completion_lock); 845 return ret; 846 } 847