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 * 9 * For licensing information, see the file 'LICENCE' in this directory. 10 * 11 * $Id: summary.c,v 1.4 2005/09/26 11:37:21 havasi Exp $ 12 * 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/sched.h> 17 #include <linux/slab.h> 18 #include <linux/mtd/mtd.h> 19 #include <linux/pagemap.h> 20 #include <linux/crc32.h> 21 #include <linux/compiler.h> 22 #include <linux/vmalloc.h> 23 #include "nodelist.h" 24 #include "debug.h" 25 26 int jffs2_sum_init(struct jffs2_sb_info *c) 27 { 28 c->summary = kmalloc(sizeof(struct jffs2_summary), GFP_KERNEL); 29 30 if (!c->summary) { 31 JFFS2_WARNING("Can't allocate memory for summary information!\n"); 32 return -ENOMEM; 33 } 34 35 memset(c->summary, 0, sizeof(struct jffs2_summary)); 36 37 c->summary->sum_buf = vmalloc(c->sector_size); 38 39 if (!c->summary->sum_buf) { 40 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n"); 41 kfree(c->summary); 42 return -ENOMEM; 43 } 44 45 dbg_summary("returned succesfully\n"); 46 47 return 0; 48 } 49 50 void jffs2_sum_exit(struct jffs2_sb_info *c) 51 { 52 dbg_summary("called\n"); 53 54 jffs2_sum_disable_collecting(c->summary); 55 56 vfree(c->summary->sum_buf); 57 c->summary->sum_buf = NULL; 58 59 kfree(c->summary); 60 c->summary = NULL; 61 } 62 63 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item) 64 { 65 if (!s->sum_list_head) 66 s->sum_list_head = (union jffs2_sum_mem *) item; 67 if (s->sum_list_tail) 68 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item; 69 s->sum_list_tail = (union jffs2_sum_mem *) item; 70 71 switch (je16_to_cpu(item->u.nodetype)) { 72 case JFFS2_NODETYPE_INODE: 73 s->sum_size += JFFS2_SUMMARY_INODE_SIZE; 74 s->sum_num++; 75 dbg_summary("inode (%u) added to summary\n", 76 je32_to_cpu(item->i.inode)); 77 break; 78 case JFFS2_NODETYPE_DIRENT: 79 s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize); 80 s->sum_num++; 81 dbg_summary("dirent (%u) added to summary\n", 82 je32_to_cpu(item->d.ino)); 83 break; 84 default: 85 JFFS2_WARNING("UNKNOWN node type %u\n", 86 je16_to_cpu(item->u.nodetype)); 87 return 1; 88 } 89 return 0; 90 } 91 92 93 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */ 94 95 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size) 96 { 97 dbg_summary("called with %u\n", size); 98 s->sum_padded += size; 99 return 0; 100 } 101 102 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, 103 uint32_t ofs) 104 { 105 struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); 106 107 if (!temp) 108 return -ENOMEM; 109 110 temp->nodetype = ri->nodetype; 111 temp->inode = ri->ino; 112 temp->version = ri->version; 113 temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */ 114 temp->totlen = ri->totlen; 115 temp->next = NULL; 116 117 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 118 } 119 120 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, 121 uint32_t ofs) 122 { 123 struct jffs2_sum_dirent_mem *temp = 124 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL); 125 126 if (!temp) 127 return -ENOMEM; 128 129 temp->nodetype = rd->nodetype; 130 temp->totlen = rd->totlen; 131 temp->offset = cpu_to_je32(ofs); /* relative from the begining of the jeb */ 132 temp->pino = rd->pino; 133 temp->version = rd->version; 134 temp->ino = rd->ino; 135 temp->nsize = rd->nsize; 136 temp->type = rd->type; 137 temp->next = NULL; 138 139 memcpy(temp->name, rd->name, rd->nsize); 140 141 return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp); 142 } 143 144 /* Cleanup every collected summary information */ 145 146 static void jffs2_sum_clean_collected(struct jffs2_summary *s) 147 { 148 union jffs2_sum_mem *temp; 149 150 if (!s->sum_list_head) { 151 dbg_summary("already empty\n"); 152 } 153 while (s->sum_list_head) { 154 temp = s->sum_list_head; 155 s->sum_list_head = s->sum_list_head->u.next; 156 kfree(temp); 157 } 158 s->sum_list_tail = NULL; 159 s->sum_padded = 0; 160 s->sum_num = 0; 161 } 162 163 void jffs2_sum_reset_collected(struct jffs2_summary *s) 164 { 165 dbg_summary("called\n"); 166 jffs2_sum_clean_collected(s); 167 s->sum_size = 0; 168 } 169 170 void jffs2_sum_disable_collecting(struct jffs2_summary *s) 171 { 172 dbg_summary("called\n"); 173 jffs2_sum_clean_collected(s); 174 s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; 175 } 176 177 int jffs2_sum_is_disabled(struct jffs2_summary *s) 178 { 179 return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE); 180 } 181 182 /* Move the collected summary information into sb (called from scan.c) */ 183 184 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s) 185 { 186 dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n", 187 c->summary->sum_size, c->summary->sum_num, 188 s->sum_size, s->sum_num); 189 190 c->summary->sum_size = s->sum_size; 191 c->summary->sum_num = s->sum_num; 192 c->summary->sum_padded = s->sum_padded; 193 c->summary->sum_list_head = s->sum_list_head; 194 c->summary->sum_list_tail = s->sum_list_tail; 195 196 s->sum_list_head = s->sum_list_tail = NULL; 197 } 198 199 /* Called from wbuf.c to collect writed node info */ 200 201 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs, 202 unsigned long count, uint32_t ofs) 203 { 204 union jffs2_node_union *node; 205 struct jffs2_eraseblock *jeb; 206 207 node = invecs[0].iov_base; 208 jeb = &c->blocks[ofs / c->sector_size]; 209 ofs -= jeb->offset; 210 211 switch (je16_to_cpu(node->u.nodetype)) { 212 case JFFS2_NODETYPE_INODE: { 213 struct jffs2_sum_inode_mem *temp = 214 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL); 215 216 if (!temp) 217 goto no_mem; 218 219 temp->nodetype = node->i.nodetype; 220 temp->inode = node->i.ino; 221 temp->version = node->i.version; 222 temp->offset = cpu_to_je32(ofs); 223 temp->totlen = node->i.totlen; 224 temp->next = NULL; 225 226 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 227 } 228 229 case JFFS2_NODETYPE_DIRENT: { 230 struct jffs2_sum_dirent_mem *temp = 231 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL); 232 233 if (!temp) 234 goto no_mem; 235 236 temp->nodetype = node->d.nodetype; 237 temp->totlen = node->d.totlen; 238 temp->offset = cpu_to_je32(ofs); 239 temp->pino = node->d.pino; 240 temp->version = node->d.version; 241 temp->ino = node->d.ino; 242 temp->nsize = node->d.nsize; 243 temp->type = node->d.type; 244 temp->next = NULL; 245 246 switch (count) { 247 case 1: 248 memcpy(temp->name,node->d.name,node->d.nsize); 249 break; 250 251 case 2: 252 memcpy(temp->name,invecs[1].iov_base,node->d.nsize); 253 break; 254 255 default: 256 BUG(); /* impossible count value */ 257 break; 258 } 259 260 return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp); 261 } 262 263 case JFFS2_NODETYPE_PADDING: 264 dbg_summary("node PADDING\n"); 265 c->summary->sum_padded += je32_to_cpu(node->u.totlen); 266 break; 267 268 case JFFS2_NODETYPE_CLEANMARKER: 269 dbg_summary("node CLEANMARKER\n"); 270 break; 271 272 case JFFS2_NODETYPE_SUMMARY: 273 dbg_summary("node SUMMARY\n"); 274 break; 275 276 default: 277 /* If you implement a new node type you should also implement 278 summary support for it or disable summary. 279 */ 280 BUG(); 281 break; 282 } 283 284 return 0; 285 286 no_mem: 287 JFFS2_WARNING("MEMORY ALLOCATION ERROR!"); 288 return -ENOMEM; 289 } 290 291 292 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */ 293 294 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 295 struct jffs2_raw_summary *summary, uint32_t *pseudo_random) 296 { 297 struct jffs2_raw_node_ref *raw; 298 struct jffs2_inode_cache *ic; 299 struct jffs2_full_dirent *fd; 300 void *sp; 301 int i, ino; 302 303 sp = summary->sum; 304 305 for (i=0; i<je32_to_cpu(summary->sum_num); i++) { 306 dbg_summary("processing summary index %d\n", i); 307 308 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) { 309 case JFFS2_NODETYPE_INODE: { 310 struct jffs2_sum_inode_flash *spi; 311 spi = sp; 312 313 ino = je32_to_cpu(spi->inode); 314 315 dbg_summary("Inode at 0x%08x\n", 316 jeb->offset + je32_to_cpu(spi->offset)); 317 318 raw = jffs2_alloc_raw_node_ref(); 319 if (!raw) { 320 JFFS2_NOTICE("allocation of node reference failed\n"); 321 return -ENOMEM; 322 } 323 324 ic = jffs2_scan_make_ino_cache(c, ino); 325 if (!ic) { 326 JFFS2_NOTICE("scan_make_ino_cache failed\n"); 327 jffs2_free_raw_node_ref(raw); 328 return -ENOMEM; 329 } 330 331 raw->flash_offset = (jeb->offset + je32_to_cpu(spi->offset)) | REF_UNCHECKED; 332 raw->__totlen = PAD(je32_to_cpu(spi->totlen)); 333 raw->next_phys = NULL; 334 raw->next_in_ino = ic->nodes; 335 336 ic->nodes = raw; 337 if (!jeb->first_node) 338 jeb->first_node = raw; 339 if (jeb->last_node) 340 jeb->last_node->next_phys = raw; 341 jeb->last_node = raw; 342 *pseudo_random += je32_to_cpu(spi->version); 343 344 UNCHECKED_SPACE(PAD(je32_to_cpu(spi->totlen))); 345 346 sp += JFFS2_SUMMARY_INODE_SIZE; 347 348 break; 349 } 350 351 case JFFS2_NODETYPE_DIRENT: { 352 struct jffs2_sum_dirent_flash *spd; 353 spd = sp; 354 355 dbg_summary("Dirent at 0x%08x\n", 356 jeb->offset + je32_to_cpu(spd->offset)); 357 358 fd = jffs2_alloc_full_dirent(spd->nsize+1); 359 if (!fd) 360 return -ENOMEM; 361 362 memcpy(&fd->name, spd->name, spd->nsize); 363 fd->name[spd->nsize] = 0; 364 365 raw = jffs2_alloc_raw_node_ref(); 366 if (!raw) { 367 jffs2_free_full_dirent(fd); 368 JFFS2_NOTICE("allocation of node reference failed\n"); 369 return -ENOMEM; 370 } 371 372 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino)); 373 if (!ic) { 374 jffs2_free_full_dirent(fd); 375 jffs2_free_raw_node_ref(raw); 376 return -ENOMEM; 377 } 378 379 raw->__totlen = PAD(je32_to_cpu(spd->totlen)); 380 raw->flash_offset = (jeb->offset + je32_to_cpu(spd->offset)) | REF_PRISTINE; 381 raw->next_phys = NULL; 382 raw->next_in_ino = ic->nodes; 383 ic->nodes = raw; 384 if (!jeb->first_node) 385 jeb->first_node = raw; 386 if (jeb->last_node) 387 jeb->last_node->next_phys = raw; 388 jeb->last_node = raw; 389 390 fd->raw = raw; 391 fd->next = NULL; 392 fd->version = je32_to_cpu(spd->version); 393 fd->ino = je32_to_cpu(spd->ino); 394 fd->nhash = full_name_hash(fd->name, spd->nsize); 395 fd->type = spd->type; 396 USED_SPACE(PAD(je32_to_cpu(spd->totlen))); 397 jffs2_add_fd_to_list(c, fd, &ic->scan_dents); 398 399 *pseudo_random += je32_to_cpu(spd->version); 400 401 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize); 402 403 break; 404 } 405 406 default : { 407 JFFS2_WARNING("Unsupported node type found in summary! Exiting..."); 408 return -EIO; 409 } 410 } 411 } 412 413 return 0; 414 } 415 416 /* Process the summary node - called from jffs2_scan_eraseblock() */ 417 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 418 struct jffs2_raw_summary *summary, uint32_t sumsize, 419 uint32_t *pseudo_random) 420 { 421 struct jffs2_unknown_node crcnode; 422 struct jffs2_raw_node_ref *cache_ref; 423 int ret, ofs; 424 uint32_t crc; 425 426 ofs = jeb->offset + c->sector_size - sumsize; 427 428 dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n", 429 jeb->offset, ofs, sumsize); 430 431 /* OK, now check for node validity and CRC */ 432 crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 433 crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 434 crcnode.totlen = summary->totlen; 435 crc = crc32(0, &crcnode, sizeof(crcnode)-4); 436 437 if (je32_to_cpu(summary->hdr_crc) != crc) { 438 dbg_summary("Summary node header is corrupt (bad CRC or " 439 "no summary at all)\n"); 440 goto crc_err; 441 } 442 443 if (je32_to_cpu(summary->totlen) != sumsize) { 444 dbg_summary("Summary node is corrupt (wrong erasesize?)\n"); 445 goto crc_err; 446 } 447 448 crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8); 449 450 if (je32_to_cpu(summary->node_crc) != crc) { 451 dbg_summary("Summary node is corrupt (bad CRC)\n"); 452 goto crc_err; 453 } 454 455 crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary)); 456 457 if (je32_to_cpu(summary->sum_crc) != crc) { 458 dbg_summary("Summary node data is corrupt (bad CRC)\n"); 459 goto crc_err; 460 } 461 462 if ( je32_to_cpu(summary->cln_mkr) ) { 463 464 dbg_summary("Summary : CLEANMARKER node \n"); 465 466 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) { 467 dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n", 468 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size); 469 UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr))); 470 } else if (jeb->first_node) { 471 dbg_summary("CLEANMARKER node not first node in block " 472 "(0x%08x)\n", jeb->offset); 473 UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr))); 474 } else { 475 struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref(); 476 477 if (!marker_ref) { 478 JFFS2_NOTICE("Failed to allocate node ref for clean marker\n"); 479 return -ENOMEM; 480 } 481 482 marker_ref->next_in_ino = NULL; 483 marker_ref->next_phys = NULL; 484 marker_ref->flash_offset = jeb->offset | REF_NORMAL; 485 marker_ref->__totlen = je32_to_cpu(summary->cln_mkr); 486 jeb->first_node = jeb->last_node = marker_ref; 487 488 USED_SPACE( PAD(je32_to_cpu(summary->cln_mkr)) ); 489 } 490 } 491 492 if (je32_to_cpu(summary->padded)) { 493 DIRTY_SPACE(je32_to_cpu(summary->padded)); 494 } 495 496 ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random); 497 if (ret) 498 return ret; 499 500 /* for PARANOIA_CHECK */ 501 cache_ref = jffs2_alloc_raw_node_ref(); 502 503 if (!cache_ref) { 504 JFFS2_NOTICE("Failed to allocate node ref for cache\n"); 505 return -ENOMEM; 506 } 507 508 cache_ref->next_in_ino = NULL; 509 cache_ref->next_phys = NULL; 510 cache_ref->flash_offset = ofs | REF_NORMAL; 511 cache_ref->__totlen = sumsize; 512 513 if (!jeb->first_node) 514 jeb->first_node = cache_ref; 515 if (jeb->last_node) 516 jeb->last_node->next_phys = cache_ref; 517 jeb->last_node = cache_ref; 518 519 USED_SPACE(sumsize); 520 521 jeb->wasted_size += jeb->free_size; 522 c->wasted_size += jeb->free_size; 523 c->free_size -= jeb->free_size; 524 jeb->free_size = 0; 525 526 return jffs2_scan_classify_jeb(c, jeb); 527 528 crc_err: 529 JFFS2_WARNING("Summary node crc error, skipping summary information.\n"); 530 531 return 0; 532 } 533 534 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */ 535 536 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, 537 uint32_t infosize, uint32_t datasize, int padsize) 538 { 539 struct jffs2_raw_summary isum; 540 union jffs2_sum_mem *temp; 541 struct jffs2_sum_marker *sm; 542 struct kvec vecs[2]; 543 void *wpage; 544 int ret; 545 size_t retlen; 546 547 memset(c->summary->sum_buf, 0xff, datasize); 548 memset(&isum, 0, sizeof(isum)); 549 550 isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 551 isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY); 552 isum.totlen = cpu_to_je32(infosize); 553 isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4)); 554 isum.padded = cpu_to_je32(c->summary->sum_padded); 555 isum.cln_mkr = cpu_to_je32(c->cleanmarker_size); 556 isum.sum_num = cpu_to_je32(c->summary->sum_num); 557 wpage = c->summary->sum_buf; 558 559 while (c->summary->sum_num) { 560 temp = c->summary->sum_list_head; 561 562 switch (je16_to_cpu(temp->u.nodetype)) { 563 case JFFS2_NODETYPE_INODE: { 564 struct jffs2_sum_inode_flash *sino_ptr = wpage; 565 566 sino_ptr->nodetype = temp->i.nodetype; 567 sino_ptr->inode = temp->i.inode; 568 sino_ptr->version = temp->i.version; 569 sino_ptr->offset = temp->i.offset; 570 sino_ptr->totlen = temp->i.totlen; 571 572 wpage += JFFS2_SUMMARY_INODE_SIZE; 573 574 break; 575 } 576 577 case JFFS2_NODETYPE_DIRENT: { 578 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage; 579 580 sdrnt_ptr->nodetype = temp->d.nodetype; 581 sdrnt_ptr->totlen = temp->d.totlen; 582 sdrnt_ptr->offset = temp->d.offset; 583 sdrnt_ptr->pino = temp->d.pino; 584 sdrnt_ptr->version = temp->d.version; 585 sdrnt_ptr->ino = temp->d.ino; 586 sdrnt_ptr->nsize = temp->d.nsize; 587 sdrnt_ptr->type = temp->d.type; 588 589 memcpy(sdrnt_ptr->name, temp->d.name, 590 temp->d.nsize); 591 592 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize); 593 594 break; 595 } 596 597 default : { 598 BUG(); /* unknown node in summary information */ 599 } 600 } 601 602 c->summary->sum_list_head = temp->u.next; 603 kfree(temp); 604 605 c->summary->sum_num--; 606 } 607 608 jffs2_sum_reset_collected(c->summary); 609 610 wpage += padsize; 611 612 sm = wpage; 613 sm->offset = cpu_to_je32(c->sector_size - jeb->free_size); 614 sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC); 615 616 isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize)); 617 isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8)); 618 619 vecs[0].iov_base = &isum; 620 vecs[0].iov_len = sizeof(isum); 621 vecs[1].iov_base = c->summary->sum_buf; 622 vecs[1].iov_len = datasize; 623 624 dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n", 625 jeb->offset + c->sector_size - jeb->free_size); 626 627 spin_unlock(&c->erase_completion_lock); 628 ret = jffs2_flash_writev(c, vecs, 2, jeb->offset + c->sector_size - 629 jeb->free_size, &retlen, 0); 630 spin_lock(&c->erase_completion_lock); 631 632 633 if (ret || (retlen != infosize)) { 634 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n", 635 infosize, jeb->offset + c->sector_size - jeb->free_size, ret, retlen); 636 637 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE; 638 WASTED_SPACE(infosize); 639 640 return 1; 641 } 642 643 return 0; 644 } 645 646 /* Write out summary information - called from jffs2_do_reserve_space */ 647 648 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c) 649 { 650 struct jffs2_raw_node_ref *summary_ref; 651 int datasize, infosize, padsize, ret; 652 struct jffs2_eraseblock *jeb; 653 654 dbg_summary("called\n"); 655 656 jeb = c->nextblock; 657 658 if (!c->summary->sum_num || !c->summary->sum_list_head) { 659 JFFS2_WARNING("Empty summary info!!!\n"); 660 BUG(); 661 } 662 663 datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker); 664 infosize = sizeof(struct jffs2_raw_summary) + datasize; 665 padsize = jeb->free_size - infosize; 666 infosize += padsize; 667 datasize += padsize; 668 669 /* Is there enough space for summary? */ 670 if (padsize < 0) { 671 /* don't try to write out summary for this jeb */ 672 jffs2_sum_disable_collecting(c->summary); 673 674 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize); 675 return 0; 676 } 677 678 ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize); 679 if (ret) 680 return 0; /* can't write out summary, block is marked as NOSUM_SIZE */ 681 682 /* for ACCT_PARANOIA_CHECK */ 683 spin_unlock(&c->erase_completion_lock); 684 summary_ref = jffs2_alloc_raw_node_ref(); 685 spin_lock(&c->erase_completion_lock); 686 687 if (!summary_ref) { 688 JFFS2_NOTICE("Failed to allocate node ref for summary\n"); 689 return -ENOMEM; 690 } 691 692 summary_ref->next_in_ino = NULL; 693 summary_ref->next_phys = NULL; 694 summary_ref->flash_offset = (jeb->offset + c->sector_size - jeb->free_size) | REF_NORMAL; 695 summary_ref->__totlen = infosize; 696 697 if (!jeb->first_node) 698 jeb->first_node = summary_ref; 699 if (jeb->last_node) 700 jeb->last_node->next_phys = summary_ref; 701 jeb->last_node = summary_ref; 702 703 USED_SPACE(infosize); 704 705 return 0; 706 } 707