fs/jffs2/summary.c

   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 1.1 2005/09/07 08:34:54 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                 return -ENOMEM;
  42         }
  43
  44         JFFS2_DBG_SUMMARY("returned succesfully\n");
  45
  46         return 0;
  47 }
  48
  49 void jffs2_sum_exit(struct jffs2_sb_info *c)
  50 {
  51         JFFS2_DBG_SUMMARY("called\n");
  52
  53         jffs2_sum_disable_collecting(c->summary);
  54
  55         vfree(c->summary->sum_buf);
  56         c->summary->sum_buf = NULL;
  57
  58         kfree(c->summary);
  59         c->summary = NULL;
  60 }
  61
  62 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
  63 {
  64         if (!s->sum_list_head)
  65                 s->sum_list_head = (union jffs2_sum_mem *) item;
  66         if (s->sum_list_tail)
  67                 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
  68         s->sum_list_tail = (union jffs2_sum_mem *) item;
  69
  70         switch (je16_to_cpu(item->u.nodetype)) {
  71                 case JFFS2_NODETYPE_INODE:
  72                         s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
  73                         s->sum_num++;
  74                         JFFS2_DBG_SUMMARY("inode (%u) added to summary\n",
  75                                                 je32_to_cpu(item->i.inode));
  76                         break;
  77                 case JFFS2_NODETYPE_DIRENT:
  78                         s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
  79                         s->sum_num++;
  80                         JFFS2_DBG_SUMMARY("dirent (%u) added to summary\n",
  81                                                 je32_to_cpu(item->d.ino));
  82                         break;
  83                 default:
  84                         JFFS2_WARNING("UNKNOWN node type %u\n",
  85                                             je16_to_cpu(item->u.nodetype));
  86                         return 1;
  87         }
  88         return 0;
  89 }
  90
  91
  92 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
  93
  94 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
  95 {
  96         JFFS2_DBG_SUMMARY("called with %u\n", size);
  97         s->sum_padded += size;
  98         return 0;
  99 }
 100
 101 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
 102                                 uint32_t ofs)
 103 {
 104         struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
 105
 106         if (!temp)
 107                 return -ENOMEM;
 108
 109         temp->nodetype = ri->nodetype;
 110         temp->inode = ri->ino;
 111         temp->version = ri->version;
 112         temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */
 113         temp->totlen = ri->totlen;
 114         temp->next = NULL;
 115
 116         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 117 }
 118
 119 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
 120                                 uint32_t ofs)
 121 {
 122         struct jffs2_sum_dirent_mem *temp =
 123                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
 124
 125         if (!temp)
 126                 return -ENOMEM;
 127
 128         temp->nodetype = rd->nodetype;
 129         temp->totlen = rd->totlen;
 130         temp->offset = cpu_to_je32(ofs);        /* relative from the begining of the jeb */
 131         temp->pino = rd->pino;
 132         temp->version = rd->version;
 133         temp->ino = rd->ino;
 134         temp->nsize = rd->nsize;
 135         temp->type = rd->type;
 136         temp->next = NULL;
 137
 138         memcpy(temp->name, rd->name, rd->nsize);
 139
 140         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 141 }
 142
 143 /* Cleanup every collected summary information */
 144
 145 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
 146 {
 147         union jffs2_sum_mem *temp;
 148
 149         if (!s->sum_list_head) {
 150                 JFFS2_DBG_SUMMARY("already empty\n");
 151         }
 152         while (s->sum_list_head) {
 153                 temp = s->sum_list_head;
 154                 s->sum_list_head = s->sum_list_head->u.next;
 155                 kfree(temp);
 156         }
 157         s->sum_list_tail = NULL;
 158         s->sum_padded = 0;
 159         s->sum_num = 0;
 160 }
 161
 162 void jffs2_sum_reset_collected(struct jffs2_summary *s)
 163 {
 164         JFFS2_DBG_SUMMARY("called\n");
 165         jffs2_sum_clean_collected(s);
 166         s->sum_size = 0;
 167 }
 168
 169 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
 170 {
 171         JFFS2_DBG_SUMMARY("called\n");
 172         jffs2_sum_clean_collected(s);
 173         s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 174 }
 175
 176 int jffs2_sum_is_disabled(struct jffs2_summary *s)
 177 {
 178         return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
 179 }
 180
 181 /* Move the collected summary information into sb (called from scan.c) */
 182
 183 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
 184 {
 185         JFFS2_DBG_SUMMARY("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
 186                                 c->summary->sum_size, c->summary->sum_num,
 187                                 s->sum_size, s->sum_num);
 188
 189         c->summary->sum_size = s->sum_size;
 190         c->summary->sum_num = s->sum_num;
 191         c->summary->sum_padded = s->sum_padded;
 192         c->summary->sum_list_head = s->sum_list_head;
 193         c->summary->sum_list_tail = s->sum_list_tail;
 194
 195         s->sum_list_head = s->sum_list_tail = NULL;
 196 }
 197
 198 /* Called from wbuf.c to collect writed node info */
 199
 200 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
 201                                 unsigned long count, uint32_t ofs)
 202 {
 203         union jffs2_node_union *node;
 204         struct jffs2_eraseblock *jeb;
 205
 206         node = invecs[0].iov_base;
 207         jeb = &c->blocks[ofs / c->sector_size];
 208         ofs -= jeb->offset;
 209
 210         switch (je16_to_cpu(node->u.nodetype)) {
 211                 case JFFS2_NODETYPE_INODE: {
 212                         struct jffs2_sum_inode_mem *temp =
 213                                 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
 214
 215                         if (!temp)
 216                                 goto no_mem;
 217
 218                         temp->nodetype = node->i.nodetype;
 219                         temp->inode = node->i.ino;
 220                         temp->version = node->i.version;
 221                         temp->offset = cpu_to_je32(ofs);
 222                         temp->totlen = node->i.totlen;
 223                         temp->next = NULL;
 224
 225                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 226                 }
 227
 228                 case JFFS2_NODETYPE_DIRENT: {
 229                         struct jffs2_sum_dirent_mem *temp =
 230                                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
 231
 232                         if (!temp)
 233                                 goto no_mem;
 234
 235                         temp->nodetype = node->d.nodetype;
 236                         temp->totlen = node->d.totlen;
 237                         temp->offset = cpu_to_je32(ofs);
 238                         temp->pino = node->d.pino;
 239                         temp->version = node->d.version;
 240                         temp->ino = node->d.ino;
 241                         temp->nsize = node->d.nsize;
 242                         temp->type = node->d.type;
 243                         temp->next = NULL;
 244
 245                         switch (count) {
 246                                 case 1:
 247                                         memcpy(temp->name,node->d.name,node->d.nsize);
 248                                         break;
 249
 250                                 case 2:
 251                                         memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
 252                                         break;
 253
 254                                 default:
 255                                         BUG();  /* impossible count value */
 256                                         break;
 257                         }
 258
 259                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 260                 }
 261
 262                 case JFFS2_NODETYPE_PADDING:
 263                         JFFS2_DBG_SUMMARY("node PADDING\n");
 264                         c->summary->sum_padded += je32_to_cpu(node->u.totlen);
 265                         break;
 266
 267                 case JFFS2_NODETYPE_CLEANMARKER:
 268                         JFFS2_DBG_SUMMARY("node CLEANMARKER\n");
 269                         break;
 270
 271                 case JFFS2_NODETYPE_SUMMARY:
 272                         JFFS2_DBG_SUMMARY("node SUMMARY\n");
 273                         break;
 274
 275                 default:
 276                         /* If you implement a new node type you should also implement
 277                            summary support for it or disable summary.
 278                         */
 279                         BUG();
 280                         break;
 281         }
 282
 283         return 0;
 284
 285 no_mem:
 286         JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
 287         return -ENOMEM;
 288 }
 289
 290
 291 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
 292
 293 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 294                                 struct jffs2_summary_node *summary, uint32_t *pseudo_random)
 295 {
 296         struct jffs2_raw_node_ref *raw;
 297         struct jffs2_inode_cache *ic;
 298         struct jffs2_full_dirent *fd;
 299         void *sp;
 300         int i, ino;
 301
 302         sp = summary->sum;
 303
 304         for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
 305                 JFFS2_DBG_SUMMARY("processing summary index %d\n", i);
 306
 307                 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
 308                         case JFFS2_NODETYPE_INODE: {
 309                                 struct jffs2_sum_inode_flash *spi;
 310                                 spi = sp;
 311
 312                                 ino = je32_to_cpu(spi->inode);
 313
 314                                 JFFS2_DBG_SUMMARY("Inode at 0x%08x\n",
 315                                                         jeb->offset + je32_to_cpu(spi->offset));
 316
 317                                 raw = jffs2_alloc_raw_node_ref();
 318                                 if (!raw) {
 319                                         JFFS2_NOTICE("allocation of node reference failed\n");
 320                                         kfree(summary);
 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                                         kfree(summary);
 329                                         return -ENOMEM;
 330                                 }
 331
 332                                 raw->flash_offset = (jeb->offset + je32_to_cpu(spi->offset)) | REF_UNCHECKED;
 333                                 raw->__totlen = PAD(je32_to_cpu(spi->totlen));
 334                                 raw->next_phys = NULL;
 335                                 raw->next_in_ino = ic->nodes;
 336
 337                                 ic->nodes = raw;
 338                                 if (!jeb->first_node)
 339                                         jeb->first_node = raw;
 340                                 if (jeb->last_node)
 341                                         jeb->last_node->next_phys = raw;
 342                                 jeb->last_node = raw;
 343                                 *pseudo_random += je32_to_cpu(spi->version);
 344
 345                                 UNCHECKED_SPACE(PAD(je32_to_cpu(spi->totlen)));
 346
 347                                 sp += JFFS2_SUMMARY_INODE_SIZE;
 348
 349                                 break;
 350                         }
 351
 352                         case JFFS2_NODETYPE_DIRENT: {
 353                                 struct jffs2_sum_dirent_flash *spd;
 354                                 spd = sp;
 355
 356                                 JFFS2_DBG_SUMMARY("Dirent at 0x%08x\n",
 357                                                         jeb->offset + je32_to_cpu(spd->offset));
 358
 359                                 fd = jffs2_alloc_full_dirent(spd->nsize+1);
 360                                 if (!fd) {
 361                                         kfree(summary);
 362                                         return -ENOMEM;
 363                                 }
 364
 365                                 memcpy(&fd->name, spd->name, spd->nsize);
 366                                 fd->name[spd->nsize] = 0;
 367
 368                                 raw = jffs2_alloc_raw_node_ref();
 369                                 if (!raw) {
 370                                         jffs2_free_full_dirent(fd);
 371                                         JFFS2_NOTICE("allocation of node reference failed\n");
 372                                         kfree(summary);
 373                                         return -ENOMEM;
 374                                 }
 375
 376                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
 377                                 if (!ic) {
 378                                         jffs2_free_full_dirent(fd);
 379                                         jffs2_free_raw_node_ref(raw);
 380                                         kfree(summary);
 381                                         return -ENOMEM;
 382                                 }
 383
 384                                 raw->__totlen = PAD(je32_to_cpu(spd->totlen));
 385                                 raw->flash_offset = (jeb->offset + je32_to_cpu(spd->offset)) | REF_PRISTINE;
 386                                 raw->next_phys = NULL;
 387                                 raw->next_in_ino = ic->nodes;
 388                                 ic->nodes = raw;
 389                                 if (!jeb->first_node)
 390                                         jeb->first_node = raw;
 391                                 if (jeb->last_node)
 392                                         jeb->last_node->next_phys = raw;
 393                                 jeb->last_node = raw;
 394
 395                                 fd->raw = raw;
 396                                 fd->next = NULL;
 397                                 fd->version = je32_to_cpu(spd->version);
 398                                 fd->ino = je32_to_cpu(spd->ino);
 399                                 fd->nhash = full_name_hash(fd->name, spd->nsize);
 400                                 fd->type = spd->type;
 401                                 USED_SPACE(PAD(je32_to_cpu(spd->totlen)));
 402                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
 403
 404                                 *pseudo_random += je32_to_cpu(spd->version);
 405
 406                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
 407
 408                                 break;
 409                         }
 410
 411                         default : {
 412                                 JFFS2_WARNING("Unsupported node type found in summary! Exiting...");
 413                                 kfree(summary);
 414                                 return -EIO;
 415                         }
 416                 }
 417         }
 418
 419         kfree(summary);
 420         return 0;
 421 }
 422
 423 /* Process the summary node - called from jffs2_scan_eraseblock() */
 424
 425 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 426                                 uint32_t ofs, uint32_t *pseudo_random)
 427 {
 428         struct jffs2_unknown_node crcnode;
 429         struct jffs2_raw_node_ref *cache_ref;
 430         struct jffs2_summary_node *summary;
 431         int ret, sumsize;
 432         uint32_t crc;
 433
 434         sumsize = c->sector_size - ofs;
 435         ofs += jeb->offset;
 436
 437         JFFS2_DBG_SUMMARY("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
 438                                 jeb->offset, ofs, sumsize);
 439
 440         summary = kmalloc(sumsize, GFP_KERNEL);
 441
 442         if (!summary) {
 443                 return -ENOMEM;
 444         }
 445
 446         ret = jffs2_fill_scan_buf(c, (unsigned char *)summary, ofs, sumsize);
 447
 448         if (ret) {
 449                 kfree(summary);
 450                 return ret;
 451         }
 452
 453         /* OK, now check for node validity and CRC */
 454         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 455         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 456         crcnode.totlen = summary->totlen;
 457         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
 458
 459         if (je32_to_cpu(summary->hdr_crc) != crc) {
 460                 JFFS2_DBG_SUMMARY("Summary node header is corrupt (bad CRC or "
 461                                 "no summary at all)\n");
 462                 goto crc_err;
 463         }
 464
 465         if (je32_to_cpu(summary->totlen) != sumsize) {
 466                 JFFS2_DBG_SUMMARY("Summary node is corrupt (wrong erasesize?)\n");
 467                 goto crc_err;
 468         }
 469
 470         crc = crc32(0, summary, sizeof(struct jffs2_summary_node)-8);
 471
 472         if (je32_to_cpu(summary->node_crc) != crc) {
 473                 JFFS2_DBG_SUMMARY("Summary node is corrupt (bad CRC)\n");
 474                 goto crc_err;
 475         }
 476
 477         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_summary_node));
 478
 479         if (je32_to_cpu(summary->sum_crc) != crc) {
 480                 JFFS2_DBG_SUMMARY("Summary node data is corrupt (bad CRC)\n");
 481                 goto crc_err;
 482         }
 483
 484         if ( je32_to_cpu(summary->cln_mkr) ) {
 485
 486                 JFFS2_DBG_SUMMARY("Summary : CLEANMARKER node \n");
 487
 488                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
 489                         JFFS2_DBG_SUMMARY("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
 490                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
 491                         UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr)));
 492                 } else if (jeb->first_node) {
 493                         JFFS2_DBG_SUMMARY("CLEANMARKER node not first node in block "
 494                                         "(0x%08x)\n", jeb->offset);
 495                         UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr)));
 496                 } else {
 497                         struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref();
 498
 499                         if (!marker_ref) {
 500                                 JFFS2_NOTICE("Failed to allocate node ref for clean marker\n");
 501                                 kfree(summary);
 502                                 return -ENOMEM;
 503                         }
 504
 505                         marker_ref->next_in_ino = NULL;
 506                         marker_ref->next_phys = NULL;
 507                         marker_ref->flash_offset = jeb->offset | REF_NORMAL;
 508                         marker_ref->__totlen = je32_to_cpu(summary->cln_mkr);
 509                         jeb->first_node = jeb->last_node = marker_ref;
 510
 511                         USED_SPACE( PAD(je32_to_cpu(summary->cln_mkr)) );
 512                 }
 513         }
 514
 515         if (je32_to_cpu(summary->padded)) {
 516                 DIRTY_SPACE(je32_to_cpu(summary->padded));
 517         }
 518
 519         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
 520         if (ret)
 521                 return ret;
 522
 523         /* for PARANOIA_CHECK */
 524         cache_ref = jffs2_alloc_raw_node_ref();
 525
 526         if (!cache_ref) {
 527                 JFFS2_NOTICE("Failed to allocate node ref for cache\n");
 528                 return -ENOMEM;
 529         }
 530
 531         cache_ref->next_in_ino = NULL;
 532         cache_ref->next_phys = NULL;
 533         cache_ref->flash_offset = ofs | REF_NORMAL;
 534         cache_ref->__totlen = sumsize;
 535
 536         if (!jeb->first_node)
 537                 jeb->first_node = cache_ref;
 538         if (jeb->last_node)
 539                 jeb->last_node->next_phys = cache_ref;
 540         jeb->last_node = cache_ref;
 541
 542         USED_SPACE(sumsize);
 543
 544         jeb->wasted_size += jeb->free_size;
 545         c->wasted_size += jeb->free_size;
 546         c->free_size -= jeb->free_size;
 547         jeb->free_size = 0;
 548
 549         return jffs2_scan_classify_jeb(c, jeb);
 550
 551 crc_err:
 552         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
 553
 554         return 0;
 555 }
 556
 557 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
 558
 559 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 560                                         uint32_t infosize, uint32_t datasize, int padsize)
 561 {
 562         struct jffs2_summary_node isum;
 563         union jffs2_sum_mem *temp;
 564         struct jffs2_sum_marker *sm;
 565         struct kvec vecs[2];
 566         void *wpage;
 567         int ret;
 568         size_t retlen;
 569
 570         memset(c->summary->sum_buf, 0xff, datasize);
 571         memset(&isum, 0, sizeof(isum));
 572
 573         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 574         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 575         isum.totlen = cpu_to_je32(infosize);
 576         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
 577         isum.padded = cpu_to_je32(c->summary->sum_padded);
 578         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
 579         isum.sum_num = cpu_to_je32(c->summary->sum_num);
 580         wpage = c->summary->sum_buf;
 581
 582         while (c->summary->sum_num) {
 583
 584                 switch (je16_to_cpu(c->summary->sum_list_head->u.nodetype)) {
 585                         case JFFS2_NODETYPE_INODE: {
 586                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
 587
 588                                 sino_ptr->nodetype = c->summary->sum_list_head->i.nodetype;
 589                                 sino_ptr->inode = c->summary->sum_list_head->i.inode;
 590                                 sino_ptr->version = c->summary->sum_list_head->i.version;
 591                                 sino_ptr->offset = c->summary->sum_list_head->i.offset;
 592                                 sino_ptr->totlen = c->summary->sum_list_head->i.totlen;
 593
 594                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
 595
 596                                 break;
 597                         }
 598
 599                         case JFFS2_NODETYPE_DIRENT: {
 600                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
 601
 602                                 sdrnt_ptr->nodetype = c->summary->sum_list_head->d.nodetype;
 603                                 sdrnt_ptr->totlen = c->summary->sum_list_head->d.totlen;
 604                                 sdrnt_ptr->offset = c->summary->sum_list_head->d.offset;
 605                                 sdrnt_ptr->pino = c->summary->sum_list_head->d.pino;
 606                                 sdrnt_ptr->version = c->summary->sum_list_head->d.version;
 607                                 sdrnt_ptr->ino = c->summary->sum_list_head->d.ino;
 608                                 sdrnt_ptr->nsize = c->summary->sum_list_head->d.nsize;
 609                                 sdrnt_ptr->type = c->summary->sum_list_head->d.type;
 610
 611                                 memcpy(sdrnt_ptr->name, c->summary->sum_list_head->d.name,
 612                                                         c->summary->sum_list_head->d.nsize);
 613
 614                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(c->summary->sum_list_head->d.nsize);
 615
 616                                 break;
 617                         }
 618
 619                         default : {
 620                                 BUG();  /* unknown node in summary information */
 621                         }
 622                 }
 623
 624                 temp = c->summary->sum_list_head;
 625                 c->summary->sum_list_head = c->summary->sum_list_head->u.next;
 626                 kfree(temp);
 627
 628                 c->summary->sum_num--;
 629         }
 630
 631         jffs2_sum_reset_collected(c->summary);
 632
 633         wpage += padsize;
 634
 635         sm = wpage;
 636         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
 637         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
 638
 639         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
 640         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
 641
 642         vecs[0].iov_base = &isum;
 643         vecs[0].iov_len = sizeof(isum);
 644         vecs[1].iov_base = c->summary->sum_buf;
 645         vecs[1].iov_len = datasize;
 646
 647         JFFS2_DBG_SUMMARY("JFFS2: writing out data to flash to pos : 0x%08x\n",
 648                         jeb->offset + c->sector_size - jeb->free_size);
 649
 650         spin_unlock(&c->erase_completion_lock);
 651         ret = jffs2_flash_writev(c, vecs, 2, jeb->offset + c->sector_size -
 652                                 jeb->free_size, &retlen, 0);
 653         spin_lock(&c->erase_completion_lock);
 654
 655
 656         if (ret || (retlen != infosize)) {
 657                 JFFS2_WARNING("Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n",
 658                         infosize, jeb->offset + c->sector_size - jeb->free_size, ret, retlen);
 659
 660                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 661                 WASTED_SPACE(infosize);
 662
 663                 return 1;
 664         }
 665
 666         return 0;
 667 }
 668
 669 /* Write out summary information - called from jffs2_do_reserve_space */
 670
 671 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
 672 {
 673         struct jffs2_raw_node_ref *summary_ref;
 674         int datasize, infosize, padsize, ret;
 675         struct jffs2_eraseblock *jeb;
 676
 677         JFFS2_DBG_SUMMARY("called\n");
 678
 679         jeb = c->nextblock;
 680
 681         if (!c->summary->sum_num || !c->summary->sum_list_head) {
 682                 JFFS2_WARNING("Empty summary info!!!\n");
 683                 BUG();
 684         }
 685
 686         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
 687         infosize = sizeof(struct jffs2_summary_node) + datasize;
 688         padsize = jeb->free_size - infosize;
 689         infosize += padsize;
 690         datasize += padsize;
 691
 692         /* Is there enough space for summary? */
 693         if (padsize < 0) {
 694                 /* don't try to write out summary for this jeb */
 695                 jffs2_sum_disable_collecting(c->summary);
 696
 697                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
 698                 return 0;
 699         }
 700
 701         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
 702         if (ret)
 703                 return 0; /* can't write out summary, block is marked as NOSUM_SIZE */
 704
 705         /* for ACCT_PARANOIA_CHECK */
 706         spin_unlock(&c->erase_completion_lock);
 707         summary_ref = jffs2_alloc_raw_node_ref();
 708         spin_lock(&c->erase_completion_lock);
 709
 710         if (!summary_ref) {
 711                 JFFS2_NOTICE("Failed to allocate node ref for summary\n");
 712                 return -ENOMEM;
 713         }
 714
 715         summary_ref->next_in_ino = NULL;
 716         summary_ref->next_phys = NULL;
 717         summary_ref->flash_offset = (jeb->offset + c->sector_size - jeb->free_size) | REF_NORMAL;
 718         summary_ref->__totlen = infosize;
 719
 720         if (!jeb->first_node)
 721                 jeb->first_node = summary_ref;
 722         if (jeb->last_node)
 723                 jeb->last_node->next_phys = summary_ref;
 724         jeb->last_node = summary_ref;
 725
 726         USED_SPACE(infosize);
 727
 728         return 0;
 729 }