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 if (je32_to_cpu(node->x.version) == 0xffffffff) 314 return 0; 315 temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL); 316 if (!temp) 317 goto no_mem; 318 319 temp->nodetype = node->x.nodetype; 320 temp->xid = node->x.xid; 321 temp->version = node->x.version; 322 temp->totlen = node->x.totlen; 323 temp->offset = cpu_to_je32(ofs); 324 temp->next = NULL; 325 326 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 327 } 328 case JFFS2_NODETYPE_XREF: { 329 struct jffs2_sum_xref_mem *temp; 330 331 if (je32_to_cpu(node->r.ino) == 0xffffffff 332 && je32_to_cpu(node->r.xid) == 0xffffffff) 333 return 0; 334 temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL); 335 if (!temp) 336 goto no_mem; 337 temp->nodetype = node->r.nodetype; 338 temp->offset = cpu_to_je32(ofs); 339 temp->next = NULL; 340 341 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 342 } 343 #endif 344 case JFFS2_NODETYPE_PADDING: 345 dbg_summary("node PADDING\n"); 346 c->summary->sum_padded += je32_to_cpu(node->u.totlen); 347 break; 348 349 case JFFS2_NODETYPE_CLEANMARKER: 350 dbg_summary("node CLEANMARKER\n"); 351 break; 352 353 case JFFS2_NODETYPE_SUMMARY: 354 dbg_summary("node SUMMARY\n"); 355 break; 356 357 default: 358 /* If you implement a new node type you should also implement 359 summary support for it or disable summary. 360 */ 361 BUG(); 362 break; 363 } 364 365 return 0; 366 367 no_mem: 368 JFFS2_WARNING("MEMORY ALLOCATION ERROR!"); 369 return -ENOMEM; 370 } 371 372 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c, 373 struct jffs2_eraseblock *jeb, 374 uint32_t ofs, uint32_t len, 375 struct jffs2_inode_cache *ic) 376 { 377 /* If there was a gap, mark it dirty */ 378 if ((ofs & ~3) > c->sector_size - jeb->free_size) { 379 /* Ew. Summary doesn't actually tell us explicitly about dirty space */ 380 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size)); 381 } 382 383 return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic); 384 } 385 386 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */ 387 388 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 389 struct jffs2_raw_summary *summary, uint32_t *pseudo_random) 390 { 391 struct jffs2_inode_cache *ic; 392 struct jffs2_full_dirent *fd; 393 void *sp; 394 int i, ino; 395 int err; 396 397 sp = summary->sum; 398 399 for (i=0; i<je32_to_cpu(summary->sum_num); i++) { 400 dbg_summary("processing summary index %d\n", i); 401 402 /* Make sure there's a spare ref for dirty space */ 403 err = jffs2_prealloc_raw_node_refs(c, 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(spu->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 spd = sp; 437 438 dbg_summary("Dirent at 0x%08x\n", 439 jeb->offset + je32_to_cpu(spd->offset), 440 jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen)); 441 442 443 fd = jffs2_alloc_full_dirent(spd->nsize+1); 444 if (!fd) 445 return -ENOMEM; 446 447 memcpy(&fd->name, spd->name, spd->nsize); 448 fd->name[spd->nsize] = 0; 449 450 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino)); 451 if (!ic) { 452 jffs2_free_full_dirent(fd); 453 return -ENOMEM; 454 } 455 456 fd->raw = sum_link_node_ref(c, jeb, je32_to_cpu(spd->offset) | REF_PRISTINE, 457 PAD(je32_to_cpu(spd->totlen)), ic); 458 459 fd->next = NULL; 460 fd->version = je32_to_cpu(spd->version); 461 fd->ino = je32_to_cpu(spd->ino); 462 fd->nhash = full_name_hash(fd->name, spd->nsize); 463 fd->type = spd->type; 464 465 jffs2_add_fd_to_list(c, fd, &ic->scan_dents); 466 467 *pseudo_random += je32_to_cpu(spd->version); 468 469 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize); 470 471 break; 472 } 473 #ifdef CONFIG_JFFS2_FS_XATTR 474 case JFFS2_NODETYPE_XATTR: { 475 struct jffs2_xattr_datum *xd; 476 struct jffs2_sum_xattr_flash *spx; 477 478 spx = (struct jffs2_sum_xattr_flash *)sp; 479 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", 480 jeb->offset + je32_to_cpu(spx->offset), 481 jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen), 482 je32_to_cpu(spx->xid), je32_to_cpu(spx->version)); 483 484 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid), 485 je32_to_cpu(spx->version)); 486 if (IS_ERR(xd)) { 487 if (PTR_ERR(xd) == -EEXIST) { 488 /* a newer version of xd exists */ 489 if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(spx->totlen)))) 490 return err; 491 sp += JFFS2_SUMMARY_XATTR_SIZE; 492 break; 493 } 494 JFFS2_NOTICE("allocation of xattr_datum failed\n"); 495 return PTR_ERR(xd); 496 } 497 498 xd->node = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, 499 PAD(je32_to_cpu(spx->totlen)), NULL); 500 /* FIXME */ xd->node->next_in_ino = (void *)xd; 501 502 *pseudo_random += je32_to_cpu(spx->xid); 503 sp += JFFS2_SUMMARY_XATTR_SIZE; 504 505 break; 506 } 507 case JFFS2_NODETYPE_XREF: { 508 struct jffs2_xattr_ref *ref; 509 struct jffs2_sum_xref_flash *spr; 510 511 spr = (struct jffs2_sum_xref_flash *)sp; 512 dbg_summary("xref at %#08x-%#08x\n", 513 jeb->offset + je32_to_cpu(spr->offset), 514 jeb->offset + je32_to_cpu(spr->offset) + PAD(sizeof(struct jffs2_raw_xref))); 515 516 ref = jffs2_alloc_xattr_ref(); 517 if (!ref) { 518 JFFS2_NOTICE("allocation of xattr_datum failed\n"); 519 return -ENOMEM; 520 } 521 ref->ino = 0xfffffffe; 522 ref->xid = 0xfffffffd; 523 ref->next = c->xref_temp; 524 c->xref_temp = ref; 525 526 ref->node = sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED, 527 PAD(sizeof(struct jffs2_raw_xref)), NULL); 528 /* FIXME */ ref->node->next_in_ino = (void *)ref; 529 530 *pseudo_random += ref->node->flash_offset; 531 sp += JFFS2_SUMMARY_XREF_SIZE; 532 533 break; 534 } 535 #endif 536 default : { 537 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype); 538 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype); 539 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT) 540 return -EIO; 541 542 /* For compatible node types, just fall back to the full scan */ 543 c->wasted_size -= jeb->wasted_size; 544 c->free_size += c->sector_size - jeb->free_size; 545 c->used_size -= jeb->used_size; 546 c->dirty_size -= jeb->dirty_size; 547 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0; 548 jeb->free_size = c->sector_size; 549 550 jffs2_free_jeb_node_refs(c, jeb); 551 return -ENOTRECOVERABLE; 552 } 553 } 554 } 555 return 0; 556 } 557 558 /* Process the summary node - called from jffs2_scan_eraseblock() */ 559 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 560 struct jffs2_raw_summary *summary, uint32_t sumsize, 561 uint32_t *pseudo_random) 562 { 563 struct jffs2_unknown_node crcnode; 564 int ret, ofs; 565 uint32_t crc; 566 int err; 567 568 ofs = c->sector_size - sumsize; 569 570 dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n", 571 jeb->offset, jeb->offset + ofs, sumsize); 572 573 /* OK, now check for node validity and CRC */ 574 crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 575 crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 576 crcnode.totlen = summary->totlen; 577 crc = crc32(0, &crcnode, sizeof(crcnode)-4); 578 579 if (je32_to_cpu(summary->hdr_crc) != crc) { 580 dbg_summary("Summary node header is corrupt (bad CRC or " 581 "no summary at all)\n"); 582 goto crc_err; 583 } 584 585 if (je32_to_cpu(summary->totlen) != sumsize) { 586 dbg_summary("Summary node is corrupt (wrong erasesize?)\n"); 587 goto crc_err; 588 } 589 590 crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8); 591 592 if (je32_to_cpu(summary->node_crc) != crc) { 593 dbg_summary("Summary node is corrupt (bad CRC)\n"); 594 goto crc_err; 595 } 596 597 crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary)); 598 599 if (je32_to_cpu(summary->sum_crc) != crc) { 600 dbg_summary("Summary node data is corrupt (bad CRC)\n"); 601 goto crc_err; 602 } 603 604 if ( je32_to_cpu(summary->cln_mkr) ) { 605 606 dbg_summary("Summary : CLEANMARKER node \n"); 607 608 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) { 609 dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n", 610 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size); 611 if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) 612 return err; 613 } else if (jeb->first_node) { 614 dbg_summary("CLEANMARKER node not first node in block " 615 "(0x%08x)\n", jeb->offset); 616 if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) 617 return err; 618 } else { 619 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, 620 je32_to_cpu(summary->cln_mkr), NULL); 621 } 622 } 623 624 ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random); 625 /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full 626 scan of this eraseblock. So return zero */ 627 if (ret == -ENOTRECOVERABLE) 628 return 0; 629 if (ret) 630 return ret; /* real error */ 631 632 /* for PARANOIA_CHECK */ 633 ret = jffs2_prealloc_raw_node_refs(c, 2); 634 if (ret) 635 return ret; 636 637 sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL); 638 639 if (unlikely(jeb->free_size)) { 640 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n", 641 jeb->free_size, jeb->offset); 642 jeb->wasted_size += jeb->free_size; 643 c->wasted_size += jeb->free_size; 644 c->free_size -= jeb->free_size; 645 jeb->free_size = 0; 646 } 647 648 return jffs2_scan_classify_jeb(c, jeb); 649 650 crc_err: 651 JFFS2_WARNING("Summary node crc error, skipping summary information.\n"); 652 653 return 0; 654 } 655 656 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */ 657 658 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 659 uint32_t infosize, uint32_t datasize, int padsize) 660 { 661 struct jffs2_raw_summary isum; 662 union jffs2_sum_mem *temp; 663 struct jffs2_sum_marker *sm; 664 struct kvec vecs[2]; 665 uint32_t sum_ofs; 666 void *wpage; 667 int ret; 668 size_t retlen; 669 670 memset(c->summary->sum_buf, 0xff, datasize); 671 memset(&isum, 0, sizeof(isum)); 672 673 isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 674 isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 675 isum.totlen = cpu_to_je32(infosize); 676 isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4)); 677 isum.padded = cpu_to_je32(c->summary->sum_padded); 678 isum.cln_mkr = cpu_to_je32(c->cleanmarker_size); 679 isum.sum_num = cpu_to_je32(c->summary->sum_num); 680 wpage = c->summary->sum_buf; 681 682 while (c->summary->sum_num) { 683 temp = c->summary->sum_list_head; 684 685 switch (je16_to_cpu(temp->u.nodetype)) { 686 case JFFS2_NODETYPE_INODE: { 687 struct jffs2_sum_inode_flash *sino_ptr = wpage; 688 689 sino_ptr->nodetype = temp->i.nodetype; 690 sino_ptr->inode = temp->i.inode; 691 sino_ptr->version = temp->i.version; 692 sino_ptr->offset = temp->i.offset; 693 sino_ptr->totlen = temp->i.totlen; 694 695 wpage += JFFS2_SUMMARY_INODE_SIZE; 696 697 break; 698 } 699 700 case JFFS2_NODETYPE_DIRENT: { 701 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage; 702 703 sdrnt_ptr->nodetype = temp->d.nodetype; 704 sdrnt_ptr->totlen = temp->d.totlen; 705 sdrnt_ptr->offset = temp->d.offset; 706 sdrnt_ptr->pino = temp->d.pino; 707 sdrnt_ptr->version = temp->d.version; 708 sdrnt_ptr->ino = temp->d.ino; 709 sdrnt_ptr->nsize = temp->d.nsize; 710 sdrnt_ptr->type = temp->d.type; 711 712 memcpy(sdrnt_ptr->name, temp->d.name, 713 temp->d.nsize); 714 715 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize); 716 717 break; 718 } 719 #ifdef CONFIG_JFFS2_FS_XATTR 720 case JFFS2_NODETYPE_XATTR: { 721 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage; 722 723 temp = c->summary->sum_list_head; 724 sxattr_ptr->nodetype = temp->x.nodetype; 725 sxattr_ptr->xid = temp->x.xid; 726 sxattr_ptr->version = temp->x.version; 727 sxattr_ptr->offset = temp->x.offset; 728 sxattr_ptr->totlen = temp->x.totlen; 729 730 wpage += JFFS2_SUMMARY_XATTR_SIZE; 731 break; 732 } 733 case JFFS2_NODETYPE_XREF: { 734 struct jffs2_sum_xref_flash *sxref_ptr = wpage; 735 736 temp = c->summary->sum_list_head; 737 sxref_ptr->nodetype = temp->r.nodetype; 738 sxref_ptr->offset = temp->r.offset; 739 740 wpage += JFFS2_SUMMARY_XREF_SIZE; 741 break; 742 } 743 #endif 744 default : { 745 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK) 746 == JFFS2_FEATURE_RWCOMPAT_COPY) { 747 dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n", 748 je16_to_cpu(temp->u.nodetype)); 749 jffs2_sum_disable_collecting(c->summary); 750 } else { 751 BUG(); /* unknown node in summary information */ 752 } 753 } 754 } 755 756 c->summary->sum_list_head = temp->u.next; 757 kfree(temp); 758 759 c->summary->sum_num--; 760 } 761 762 jffs2_sum_reset_collected(c->summary); 763 764 wpage += padsize; 765 766 sm = wpage; 767 sm->offset = cpu_to_je32(c->sector_size - jeb->free_size); 768 sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC); 769 770 isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize)); 771 isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8)); 772 773 vecs[0].iov_base = &isum; 774 vecs[0].iov_len = sizeof(isum); 775 vecs[1].iov_base = c->summary->sum_buf; 776 vecs[1].iov_len = datasize; 777 778 sum_ofs = jeb->offset + c->sector_size - jeb->free_size; 779 780 dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n", 781 sum_ofs); 782 783 ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0); 784 785 if (ret || (retlen != infosize)) { 786 787 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n", 788 infosize, sum_ofs, ret, retlen); 789 790 /* Waste remaining space */ 791 spin_lock(&c->erase_completion_lock); 792 jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL); 793 spin_unlock(&c->erase_completion_lock); 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 jffs2_prealloc_raw_node_refs(c, 1); 819 820 jeb = c->nextblock; 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 return 0; 840 } 841 842 ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize); 843 spin_lock(&c->erase_completion_lock); 844 return ret; 845 } 846