1/* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright �� 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>, 5 * Zoltan Sogor <weth@inf.u-szeged.hu>, 6 * Patrik Kluba <pajko@halom.u-szeged.hu>, 7 * University of Szeged, Hungary 8 * 2006 KaiGai Kohei <kaigai@ak.jp.nec.com> 9 * 10 * For licensing information, see the file 'LICENCE' in this directory. 11 * 12 */ 13 14#include <linux/kernel.h> 15#include <linux/slab.h> 16#include <linux/mtd/mtd.h> 17#include <linux/pagemap.h> 18#include <linux/crc32.h> 19#include <linux/compiler.h> 20#include <linux/vmalloc.h> 21#include "nodelist.h" 22#include "debug.h" 23 24int jffs2_sum_init(struct jffs2_sb_info *c) 25{ 26 c->summary = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL); 27 28 if (!c->summary) { 29 JFFS2_WARNING("Can't allocate memory for summary information!\n"); 30 return -ENOMEM; 31 } 32 33 c->summary->sum_buf = vmalloc(c->sector_size); 34 35 if (!c->summary->sum_buf) { 36 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n"); 37 kfree(c->summary); 38 return -ENOMEM; 39 } 40 41 dbg_summary("returned successfully\n"); 42 43 return 0; 44} 45 46void jffs2_sum_exit(struct jffs2_sb_info *c) 47{ 48 dbg_summary("called\n"); 49 50 jffs2_sum_disable_collecting(c->summary); 51 52 vfree(c->summary->sum_buf); 53 c->summary->sum_buf = NULL; 54 55 kfree(c->summary); 56 c->summary = NULL; 57} 58 59static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item) 60{ 61 if (!s->sum_list_head) 62 s->sum_list_head = (union jffs2_sum_mem *) item; 63 if (s->sum_list_tail) 64 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item; 65 s->sum_list_tail = (union jffs2_sum_mem *) item; 66 67 switch (je16_to_cpu(item->u.nodetype)) { 68 case JFFS2_NODETYPE_INODE: 69 s->sum_size += JFFS2_SUMMARY_INODE_SIZE; 70 s->sum_num++; 71 dbg_summary("inode (%u) added to summary\n", 72 je32_to_cpu(item->i.inode)); 73 break; 74 case JFFS2_NODETYPE_DIRENT: 75 s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize); 76 s->sum_num++; 77 dbg_summary("dirent (%u) added to summary\n", 78 je32_to_cpu(item->d.ino)); 79 break; 80#ifdef CONFIG_JFFS2_FS_XATTR 81 case JFFS2_NODETYPE_XATTR: 82 s->sum_size += JFFS2_SUMMARY_XATTR_SIZE; 83 s->sum_num++; 84 dbg_summary("xattr (xid=%u, version=%u) added to summary\n", 85 je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version)); 86 break; 87 case JFFS2_NODETYPE_XREF: 88 s->sum_size += JFFS2_SUMMARY_XREF_SIZE; 89 s->sum_num++; 90 dbg_summary("xref added to summary\n"); 91 break; 92#endif 93 default: 94 JFFS2_WARNING("UNKNOWN node type %u\n", 95 je16_to_cpu(item->u.nodetype)); 96 return 1; 97 } 98 return 0; 99} 100 101 102/* The following 3 functions are called from scan.c to collect summary info for not closed jeb */ 103 104int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size) 105{ 106 dbg_summary("called with %u\n", size); 107 s->sum_padded += size; 108 return 0; 109} 110 111int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, 112 uint32_t ofs) 113{ 114 struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); 115 116 if (!temp) 117 return -ENOMEM; 118 119 temp->nodetype = ri->nodetype; 120 temp->inode = ri->ino; 121 temp->version = ri->version; 122 temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */ 123 temp->totlen = ri->totlen; 124 temp->next = NULL; 125 126 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 127} 128 129int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, 130 uint32_t ofs) 131{ 132 struct jffs2_sum_dirent_mem *temp = 133 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL); 134 135 if (!temp) 136 return -ENOMEM; 137 138 temp->nodetype = rd->nodetype; 139 temp->totlen = rd->totlen; 140 temp->offset = cpu_to_je32(ofs); /* relative from the begining of the jeb */ 141 temp->pino = rd->pino; 142 temp->version = rd->version; 143 temp->ino = rd->ino; 144 temp->nsize = rd->nsize; 145 temp->type = rd->type; 146 temp->next = NULL; 147 148 memcpy(temp->name, rd->name, rd->nsize); 149 150 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 151} 152 153#ifdef CONFIG_JFFS2_FS_XATTR 154int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs) 155{ 156 struct jffs2_sum_xattr_mem *temp; 157 158 temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL); 159 if (!temp) 160 return -ENOMEM; 161 162 temp->nodetype = rx->nodetype; 163 temp->xid = rx->xid; 164 temp->version = rx->version; 165 temp->offset = cpu_to_je32(ofs); 166 temp->totlen = rx->totlen; 167 temp->next = NULL; 168 169 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 170} 171 172int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs) 173{ 174 struct jffs2_sum_xref_mem *temp; 175 176 temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL); 177 if (!temp) 178 return -ENOMEM; 179 180 temp->nodetype = rr->nodetype; 181 temp->offset = cpu_to_je32(ofs); 182 temp->next = NULL; 183 184 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 185} 186#endif 187/* Cleanup every collected summary information */ 188 189static void jffs2_sum_clean_collected(struct jffs2_summary *s) 190{ 191 union jffs2_sum_mem *temp; 192 193 if (!s->sum_list_head) { 194 dbg_summary("already empty\n"); 195 } 196 while (s->sum_list_head) { 197 temp = s->sum_list_head; 198 s->sum_list_head = s->sum_list_head->u.next; 199 kfree(temp); 200 } 201 s->sum_list_tail = NULL; 202 s->sum_padded = 0; 203 s->sum_num = 0; 204} 205 206void jffs2_sum_reset_collected(struct jffs2_summary *s) 207{ 208 dbg_summary("called\n"); 209 jffs2_sum_clean_collected(s); 210 s->sum_size = 0; 211} 212 213void jffs2_sum_disable_collecting(struct jffs2_summary *s) 214{ 215 dbg_summary("called\n"); 216 jffs2_sum_clean_collected(s); 217 s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; 218} 219 220int jffs2_sum_is_disabled(struct jffs2_summary *s) 221{ 222 return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE); 223} 224 225/* Move the collected summary information into sb (called from scan.c) */ 226 227void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s) 228{ 229 dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n", 230 c->summary->sum_size, c->summary->sum_num, 231 s->sum_size, s->sum_num); 232 233 c->summary->sum_size = s->sum_size; 234 c->summary->sum_num = s->sum_num; 235 c->summary->sum_padded = s->sum_padded; 236 c->summary->sum_list_head = s->sum_list_head; 237 c->summary->sum_list_tail = s->sum_list_tail; 238 239 s->sum_list_head = s->sum_list_tail = NULL; 240} 241 242/* Called from wbuf.c to collect writed node info */ 243 244int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs, 245 unsigned long count, uint32_t ofs) 246{ 247 union jffs2_node_union *node; 248 struct jffs2_eraseblock *jeb; 249 250 if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) { 251 dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n"); 252 return 0; 253 } 254 255 node = invecs[0].iov_base; 256 jeb = &c->blocks[ofs / c->sector_size]; 257 ofs -= jeb->offset; 258 259 switch (je16_to_cpu(node->u.nodetype)) { 260 case JFFS2_NODETYPE_INODE: { 261 struct jffs2_sum_inode_mem *temp = 262 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); 263 264 if (!temp) 265 goto no_mem; 266 267 temp->nodetype = node->i.nodetype; 268 temp->inode = node->i.ino; 269 temp->version = node->i.version; 270 temp->offset = cpu_to_je32(ofs); 271 temp->totlen = node->i.totlen; 272 temp->next = NULL; 273 274 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 275 } 276 277 case JFFS2_NODETYPE_DIRENT: { 278 struct jffs2_sum_dirent_mem *temp = 279 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL); 280 281 if (!temp) 282 goto no_mem; 283 284 temp->nodetype = node->d.nodetype; 285 temp->totlen = node->d.totlen; 286 temp->offset = cpu_to_je32(ofs); 287 temp->pino = node->d.pino; 288 temp->version = node->d.version; 289 temp->ino = node->d.ino; 290 temp->nsize = node->d.nsize; 291 temp->type = node->d.type; 292 temp->next = NULL; 293 294 switch (count) { 295 case 1: 296 memcpy(temp->name,node->d.name,node->d.nsize); 297 break; 298 299 case 2: 300 memcpy(temp->name,invecs[1].iov_base,node->d.nsize); 301 break; 302 303 default: 304 BUG(); /* impossible count value */ 305 break; 306 } 307 308 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 309 } 310#ifdef CONFIG_JFFS2_FS_XATTR 311 case JFFS2_NODETYPE_XATTR: { 312 struct jffs2_sum_xattr_mem *temp; 313 temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL); 314 if (!temp) 315 goto no_mem; 316 317 temp->nodetype = node->x.nodetype; 318 temp->xid = node->x.xid; 319 temp->version = node->x.version; 320 temp->totlen = node->x.totlen; 321 temp->offset = cpu_to_je32(ofs); 322 temp->next = NULL; 323 324 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 325 } 326 case JFFS2_NODETYPE_XREF: { 327 struct jffs2_sum_xref_mem *temp; 328 temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL); 329 if (!temp) 330 goto no_mem; 331 temp->nodetype = node->r.nodetype; 332 temp->offset = cpu_to_je32(ofs); 333 temp->next = NULL; 334 335 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 336 } 337#endif 338 case JFFS2_NODETYPE_PADDING: 339 dbg_summary("node PADDING\n"); 340 c->summary->sum_padded += je32_to_cpu(node->u.totlen); 341 break; 342 343 case JFFS2_NODETYPE_CLEANMARKER: 344 dbg_summary("node CLEANMARKER\n"); 345 break; 346 347 case JFFS2_NODETYPE_SUMMARY: 348 dbg_summary("node SUMMARY\n"); 349 break; 350 351 default: 352 /* If you implement a new node type you should also implement 353 summary support for it or disable summary. 354 */ 355 BUG(); 356 break; 357 } 358 359 return 0; 360 361no_mem: 362 JFFS2_WARNING("MEMORY ALLOCATION ERROR!"); 363 return -ENOMEM; 364} 365 366static 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 382static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 383 struct jffs2_raw_summary *summary, uint32_t *pseudo_random) 384{ 385 struct jffs2_inode_cache *ic; 386 struct jffs2_full_dirent *fd; 387 void *sp; 388 int i, ino; 389 int err; 390 391 sp = summary->sum; 392 393 for (i=0; i<je32_to_cpu(summary->sum_num); i++) { 394 dbg_summary("processing summary index %d\n", i); 395 396 cond_resched(); 397 398 /* Make sure there's a spare ref for dirty space */ 399 err = jffs2_prealloc_raw_node_refs(c, jeb, 2); 400 if (err) 401 return err; 402 403 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) { 404 case JFFS2_NODETYPE_INODE: { 405 struct jffs2_sum_inode_flash *spi; 406 spi = sp; 407 408 ino = je32_to_cpu(spi->inode); 409 410 dbg_summary("Inode at 0x%08x-0x%08x\n", 411 jeb->offset + je32_to_cpu(spi->offset), 412 jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen)); 413 414 ic = jffs2_scan_make_ino_cache(c, ino); 415 if (!ic) { 416 JFFS2_NOTICE("scan_make_ino_cache failed\n"); 417 return -ENOMEM; 418 } 419 420 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED, 421 PAD(je32_to_cpu(spi->totlen)), ic); 422 423 *pseudo_random += je32_to_cpu(spi->version); 424 425 sp += JFFS2_SUMMARY_INODE_SIZE; 426 427 break; 428 } 429 430 case JFFS2_NODETYPE_DIRENT: { 431 struct jffs2_sum_dirent_flash *spd; 432 spd = sp; 433 434 dbg_summary("Dirent at 0x%08x-0x%08x\n", 435 jeb->offset + je32_to_cpu(spd->offset), 436 jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen)); 437 438 439 fd = jffs2_alloc_full_dirent(spd->nsize+1); 440 if (!fd) 441 return -ENOMEM; 442 443 memcpy(&fd->name, spd->name, spd->nsize); 444 fd->name[spd->nsize] = 0; 445 446 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino)); 447 if (!ic) { 448 jffs2_free_full_dirent(fd); 449 return -ENOMEM; 450 } 451 452 fd->raw = sum_link_node_ref(c, jeb, je32_to_cpu(spd->offset) | REF_UNCHECKED, 453 PAD(je32_to_cpu(spd->totlen)), ic); 454 455 fd->next = NULL; 456 fd->version = je32_to_cpu(spd->version); 457 fd->ino = je32_to_cpu(spd->ino); 458 fd->nhash = full_name_hash(fd->name, spd->nsize); 459 fd->type = spd->type; 460 461 jffs2_add_fd_to_list(c, fd, &ic->scan_dents); 462 463 *pseudo_random += je32_to_cpu(spd->version); 464 465 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize); 466 467 break; 468 } 469#ifdef CONFIG_JFFS2_FS_XATTR 470 case JFFS2_NODETYPE_XATTR: { 471 struct jffs2_xattr_datum *xd; 472 struct jffs2_sum_xattr_flash *spx; 473 474 spx = (struct jffs2_sum_xattr_flash *)sp; 475 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", 476 jeb->offset + je32_to_cpu(spx->offset), 477 jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen), 478 je32_to_cpu(spx->xid), je32_to_cpu(spx->version)); 479 480 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid), 481 je32_to_cpu(spx->version)); 482 if (IS_ERR(xd)) 483 return PTR_ERR(xd); 484 if (xd->version > je32_to_cpu(spx->version)) { 485 /* node is not the newest one */ 486 struct jffs2_raw_node_ref *raw 487 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, 488 PAD(je32_to_cpu(spx->totlen)), NULL); 489 raw->next_in_ino = xd->node->next_in_ino; 490 xd->node->next_in_ino = raw; 491 } else { 492 xd->version = je32_to_cpu(spx->version); 493 sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED, 494 PAD(je32_to_cpu(spx->totlen)), (void *)xd); 495 } 496 *pseudo_random += je32_to_cpu(spx->xid); 497 sp += JFFS2_SUMMARY_XATTR_SIZE; 498 499 break; 500 } 501 case JFFS2_NODETYPE_XREF: { 502 struct jffs2_xattr_ref *ref; 503 struct jffs2_sum_xref_flash *spr; 504 505 spr = (struct jffs2_sum_xref_flash *)sp; 506 dbg_summary("xref at %#08x-%#08x\n", 507 jeb->offset + je32_to_cpu(spr->offset), 508 jeb->offset + je32_to_cpu(spr->offset) + 509 (uint32_t)PAD(sizeof(struct jffs2_raw_xref))); 510 511 ref = jffs2_alloc_xattr_ref(); 512 if (!ref) { 513 JFFS2_NOTICE("allocation of xattr_datum failed\n"); 514 return -ENOMEM; 515 } 516 ref->next = c->xref_temp; 517 c->xref_temp = ref; 518 519 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED, 520 PAD(sizeof(struct jffs2_raw_xref)), (void *)ref); 521 522 *pseudo_random += ref->node->flash_offset; 523 sp += JFFS2_SUMMARY_XREF_SIZE; 524 525 break; 526 } 527#endif 528 default : { 529 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype); 530 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype); 531 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT) 532 return -EIO; 533 534 /* For compatible node types, just fall back to the full scan */ 535 c->wasted_size -= jeb->wasted_size; 536 c->free_size += c->sector_size - jeb->free_size; 537 c->used_size -= jeb->used_size; 538 c->dirty_size -= jeb->dirty_size; 539 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0; 540 jeb->free_size = c->sector_size; 541 542 jffs2_free_jeb_node_refs(c, jeb); 543 return -ENOTRECOVERABLE; 544 } 545 } 546 } 547 return 0; 548} 549 550/* Process the summary node - called from jffs2_scan_eraseblock() */ 551int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 552 struct jffs2_raw_summary *summary, uint32_t sumsize, 553 uint32_t *pseudo_random) 554{ 555 struct jffs2_unknown_node crcnode; 556 int ret, ofs; 557 uint32_t crc; 558 559 ofs = c->sector_size - sumsize; 560 561 dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n", 562 jeb->offset, jeb->offset + ofs, sumsize); 563 564 /* OK, now check for node validity and CRC */ 565 crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 566 crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 567 crcnode.totlen = summary->totlen; 568 crc = crc32(0, &crcnode, sizeof(crcnode)-4); 569 570 if (je32_to_cpu(summary->hdr_crc) != crc) { 571 dbg_summary("Summary node header is corrupt (bad CRC or " 572 "no summary at all)\n"); 573 goto crc_err; 574 } 575 576 if (je32_to_cpu(summary->totlen) != sumsize) { 577 dbg_summary("Summary node is corrupt (wrong erasesize?)\n"); 578 goto crc_err; 579 } 580 581 crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8); 582 583 if (je32_to_cpu(summary->node_crc) != crc) { 584 dbg_summary("Summary node is corrupt (bad CRC)\n"); 585 goto crc_err; 586 } 587 588 crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary)); 589 590 if (je32_to_cpu(summary->sum_crc) != crc) { 591 dbg_summary("Summary node data is corrupt (bad CRC)\n"); 592 goto crc_err; 593 } 594 595 if ( je32_to_cpu(summary->cln_mkr) ) { 596 597 dbg_summary("Summary : CLEANMARKER node \n"); 598 599 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1); 600 if (ret) 601 return ret; 602 603 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) { 604 dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n", 605 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size); 606 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) 607 return ret; 608 } else if (jeb->first_node) { 609 dbg_summary("CLEANMARKER node not first node in block " 610 "(0x%08x)\n", jeb->offset); 611 if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr))))) 612 return ret; 613 } else { 614 jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL, 615 je32_to_cpu(summary->cln_mkr), NULL); 616 } 617 } 618 619 ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random); 620 /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full 621 scan of this eraseblock. So return zero */ 622 if (ret == -ENOTRECOVERABLE) 623 return 0; 624 if (ret) 625 return ret; /* real error */ 626 627 /* for PARANOIA_CHECK */ 628 ret = jffs2_prealloc_raw_node_refs(c, jeb, 2); 629 if (ret) 630 return ret; 631 632 sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL); 633 634 if (unlikely(jeb->free_size)) { 635 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n", 636 jeb->free_size, jeb->offset); 637 jeb->wasted_size += jeb->free_size; 638 c->wasted_size += jeb->free_size; 639 c->free_size -= jeb->free_size; 640 jeb->free_size = 0; 641 } 642 643 return jffs2_scan_classify_jeb(c, jeb); 644 645crc_err: 646 JFFS2_WARNING("Summary node crc error, skipping summary information.\n"); 647 648 return 0; 649} 650 651/* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */ 652 653static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 654 uint32_t infosize, uint32_t datasize, int padsize) 655{ 656 struct jffs2_raw_summary isum; 657 union jffs2_sum_mem *temp; 658 struct jffs2_sum_marker *sm; 659 struct kvec vecs[2]; 660 uint32_t sum_ofs; 661 void *wpage; 662 int ret; 663 size_t retlen; 664 665 memset(c->summary->sum_buf, 0xff, datasize); 666 memset(&isum, 0, sizeof(isum)); 667 668 isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 669 isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 670 isum.totlen = cpu_to_je32(infosize); 671 isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4)); 672 isum.padded = cpu_to_je32(c->summary->sum_padded); 673 isum.cln_mkr = cpu_to_je32(c->cleanmarker_size); 674 isum.sum_num = cpu_to_je32(c->summary->sum_num); 675 wpage = c->summary->sum_buf; 676 677 while (c->summary->sum_num) { 678 temp = c->summary->sum_list_head; 679 680 switch (je16_to_cpu(temp->u.nodetype)) { 681 case JFFS2_NODETYPE_INODE: { 682 struct jffs2_sum_inode_flash *sino_ptr = wpage; 683 684 sino_ptr->nodetype = temp->i.nodetype; 685 sino_ptr->inode = temp->i.inode; 686 sino_ptr->version = temp->i.version; 687 sino_ptr->offset = temp->i.offset; 688 sino_ptr->totlen = temp->i.totlen; 689 690 wpage += JFFS2_SUMMARY_INODE_SIZE; 691 692 break; 693 } 694 695 case JFFS2_NODETYPE_DIRENT: { 696 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage; 697 698 sdrnt_ptr->nodetype = temp->d.nodetype; 699 sdrnt_ptr->totlen = temp->d.totlen; 700 sdrnt_ptr->offset = temp->d.offset; 701 sdrnt_ptr->pino = temp->d.pino; 702 sdrnt_ptr->version = temp->d.version; 703 sdrnt_ptr->ino = temp->d.ino; 704 sdrnt_ptr->nsize = temp->d.nsize; 705 sdrnt_ptr->type = temp->d.type; 706 707 memcpy(sdrnt_ptr->name, temp->d.name, 708 temp->d.nsize); 709 710 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize); 711 712 break; 713 } 714#ifdef CONFIG_JFFS2_FS_XATTR 715 case JFFS2_NODETYPE_XATTR: { 716 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage; 717 718 temp = c->summary->sum_list_head; 719 sxattr_ptr->nodetype = temp->x.nodetype; 720 sxattr_ptr->xid = temp->x.xid; 721 sxattr_ptr->version = temp->x.version; 722 sxattr_ptr->offset = temp->x.offset; 723 sxattr_ptr->totlen = temp->x.totlen; 724 725 wpage += JFFS2_SUMMARY_XATTR_SIZE; 726 break; 727 } 728 case JFFS2_NODETYPE_XREF: { 729 struct jffs2_sum_xref_flash *sxref_ptr = wpage; 730 731 temp = c->summary->sum_list_head; 732 sxref_ptr->nodetype = temp->r.nodetype; 733 sxref_ptr->offset = temp->r.offset; 734 735 wpage += JFFS2_SUMMARY_XREF_SIZE; 736 break; 737 } 738#endif 739 default : { 740 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK) 741 == JFFS2_FEATURE_RWCOMPAT_COPY) { 742 dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n", 743 je16_to_cpu(temp->u.nodetype)); 744 jffs2_sum_disable_collecting(c->summary); 745 } else { 746 BUG(); /* unknown node in summary information */ 747 } 748 } 749 } 750 751 c->summary->sum_list_head = temp->u.next; 752 kfree(temp); 753 754 c->summary->sum_num--; 755 } 756 757 jffs2_sum_reset_collected(c->summary); 758 759 wpage += padsize; 760 761 sm = wpage; 762 sm->offset = cpu_to_je32(c->sector_size - jeb->free_size); 763 sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC); 764 765 isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize)); 766 isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8)); 767 768 vecs[0].iov_base = &isum; 769 vecs[0].iov_len = sizeof(isum); 770 vecs[1].iov_base = c->summary->sum_buf; 771 vecs[1].iov_len = datasize; 772 773 sum_ofs = jeb->offset + c->sector_size - jeb->free_size; 774 775 dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n", 776 sum_ofs); 777 778 ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0); 779 780 if (ret || (retlen != infosize)) { 781 782 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n", 783 infosize, sum_ofs, ret, retlen); 784 785 if (retlen) { 786 /* Waste remaining space */ 787 spin_lock(&c->erase_completion_lock); 788 jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL); 789 spin_unlock(&c->erase_completion_lock); 790 } 791 792 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; 793 794 return 0; 795 } 796 797 spin_lock(&c->erase_completion_lock); 798 jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL); 799 spin_unlock(&c->erase_completion_lock); 800 801 return 0; 802} 803 804/* Write out summary information - called from jffs2_do_reserve_space */ 805 806int jffs2_sum_write_sumnode(struct jffs2_sb_info *c) 807{ 808 int datasize, infosize, padsize; 809 struct jffs2_eraseblock *jeb; 810 int ret; 811 812 dbg_summary("called\n"); 813 814 spin_unlock(&c->erase_completion_lock); 815 816 jeb = c->nextblock; 817 jffs2_prealloc_raw_node_refs(c, jeb, 1); 818 819 if (!c->summary->sum_num || !c->summary->sum_list_head) { 820 JFFS2_WARNING("Empty summary info!!!\n"); 821 BUG(); 822 } 823 824 datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker); 825 infosize = sizeof(struct jffs2_raw_summary) + datasize; 826 padsize = jeb->free_size - infosize; 827 infosize += padsize; 828 datasize += padsize; 829 830 /* Is there enough space for summary? */ 831 if (padsize < 0) { 832 /* don't try to write out summary for this jeb */ 833 jffs2_sum_disable_collecting(c->summary); 834 835 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize); 836 spin_lock(&c->erase_completion_lock); 837 return 0; 838 } 839 840 ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize); 841 spin_lock(&c->erase_completion_lock); 842 return ret; 843} 844