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 1.4 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                                         kfree(summary);
 322                                         return -ENOMEM;
 323                                 }
 324
 325                                 ic = jffs2_scan_make_ino_cache(c, ino);
 326                                 if (!ic) {
 327                                         JFFS2_NOTICE("scan_make_ino_cache failed\n");
 328                                         jffs2_free_raw_node_ref(raw);
 329                                         kfree(summary);
 330                                         return -ENOMEM;
 331                                 }
 332
 333                                 raw->flash_offset = (jeb->offset + je32_to_cpu(spi->offset)) | REF_UNCHECKED;
 334                                 raw->__totlen = PAD(je32_to_cpu(spi->totlen));
 335                                 raw->next_phys = NULL;
 336                                 raw->next_in_ino = ic->nodes;
 337
 338                                 ic->nodes = raw;
 339                                 if (!jeb->first_node)
 340                                         jeb->first_node = raw;
 341                                 if (jeb->last_node)
 342                                         jeb->last_node->next_phys = raw;
 343                                 jeb->last_node = raw;
 344                                 *pseudo_random += je32_to_cpu(spi->version);
 345
 346                                 UNCHECKED_SPACE(PAD(je32_to_cpu(spi->totlen)));
 347
 348                                 sp += JFFS2_SUMMARY_INODE_SIZE;
 349
 350                                 break;
 351                         }
 352
 353                         case JFFS2_NODETYPE_DIRENT: {
 354                                 struct jffs2_sum_dirent_flash *spd;
 355                                 spd = sp;
 356
 357                                 dbg_summary("Dirent at 0x%08x\n",
 358                                                         jeb->offset + je32_to_cpu(spd->offset));
 359
 360                                 fd = jffs2_alloc_full_dirent(spd->nsize+1);
 361                                 if (!fd) {
 362                                         kfree(summary);
 363                                         return -ENOMEM;
 364                                 }
 365
 366                                 memcpy(&fd->name, spd->name, spd->nsize);
 367                                 fd->name[spd->nsize] = 0;
 368
 369                                 raw = jffs2_alloc_raw_node_ref();
 370                                 if (!raw) {
 371                                         jffs2_free_full_dirent(fd);
 372                                         JFFS2_NOTICE("allocation of node reference failed\n");
 373                                         kfree(summary);
 374                                         return -ENOMEM;
 375                                 }
 376
 377                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
 378                                 if (!ic) {
 379                                         jffs2_free_full_dirent(fd);
 380                                         jffs2_free_raw_node_ref(raw);
 381                                         kfree(summary);
 382                                         return -ENOMEM;
 383                                 }
 384
 385                                 raw->__totlen = PAD(je32_to_cpu(spd->totlen));
 386                                 raw->flash_offset = (jeb->offset + je32_to_cpu(spd->offset)) | REF_PRISTINE;
 387                                 raw->next_phys = NULL;
 388                                 raw->next_in_ino = ic->nodes;
 389                                 ic->nodes = raw;
 390                                 if (!jeb->first_node)
 391                                         jeb->first_node = raw;
 392                                 if (jeb->last_node)
 393                                         jeb->last_node->next_phys = raw;
 394                                 jeb->last_node = raw;
 395
 396                                 fd->raw = raw;
 397                                 fd->next = NULL;
 398                                 fd->version = je32_to_cpu(spd->version);
 399                                 fd->ino = je32_to_cpu(spd->ino);
 400                                 fd->nhash = full_name_hash(fd->name, spd->nsize);
 401                                 fd->type = spd->type;
 402                                 USED_SPACE(PAD(je32_to_cpu(spd->totlen)));
 403                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
 404
 405                                 *pseudo_random += je32_to_cpu(spd->version);
 406
 407                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
 408
 409                                 break;
 410                         }
 411
 412                         default : {
 413                                 JFFS2_WARNING("Unsupported node type found in summary! Exiting...");
 414                                 kfree(summary);
 415                                 return -EIO;
 416                         }
 417                 }
 418         }
 419
 420         kfree(summary);
 421         return 0;
 422 }
 423
 424 /* Process the summary node - called from jffs2_scan_eraseblock() */
 425
 426 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 427                                 uint32_t ofs, uint32_t *pseudo_random)
 428 {
 429         struct jffs2_unknown_node crcnode;
 430         struct jffs2_raw_node_ref *cache_ref;
 431         struct jffs2_raw_summary *summary;
 432         int ret, sumsize;
 433         uint32_t crc;
 434
 435         sumsize = c->sector_size - ofs;
 436         ofs += jeb->offset;
 437
 438         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
 439                                 jeb->offset, ofs, sumsize);
 440
 441         summary = kmalloc(sumsize, GFP_KERNEL);
 442
 443         if (!summary) {
 444                 return -ENOMEM;
 445         }
 446
 447         ret = jffs2_fill_scan_buf(c, (unsigned char *)summary, ofs, sumsize);
 448
 449         if (ret) {
 450                 kfree(summary);
 451                 return ret;
 452         }
 453
 454         /* OK, now check for node validity and CRC */
 455         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 456         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 457         crcnode.totlen = summary->totlen;
 458         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
 459
 460         if (je32_to_cpu(summary->hdr_crc) != crc) {
 461                 dbg_summary("Summary node header is corrupt (bad CRC or "
 462                                 "no summary at all)\n");
 463                 goto crc_err;
 464         }
 465
 466         if (je32_to_cpu(summary->totlen) != sumsize) {
 467                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
 468                 goto crc_err;
 469         }
 470
 471         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
 472
 473         if (je32_to_cpu(summary->node_crc) != crc) {
 474                 dbg_summary("Summary node is corrupt (bad CRC)\n");
 475                 goto crc_err;
 476         }
 477
 478         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
 479
 480         if (je32_to_cpu(summary->sum_crc) != crc) {
 481                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
 482                 goto crc_err;
 483         }
 484
 485         if ( je32_to_cpu(summary->cln_mkr) ) {
 486
 487                 dbg_summary("Summary : CLEANMARKER node \n");
 488
 489                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
 490                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
 491                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
 492                         UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr)));
 493                 } else if (jeb->first_node) {
 494                         dbg_summary("CLEANMARKER node not first node in block "
 495                                         "(0x%08x)\n", jeb->offset);
 496                         UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr)));
 497                 } else {
 498                         struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref();
 499
 500                         if (!marker_ref) {
 501                                 JFFS2_NOTICE("Failed to allocate node ref for clean marker\n");
 502                                 kfree(summary);
 503                                 return -ENOMEM;
 504                         }
 505
 506                         marker_ref->next_in_ino = NULL;
 507                         marker_ref->next_phys = NULL;
 508                         marker_ref->flash_offset = jeb->offset | REF_NORMAL;
 509                         marker_ref->__totlen = je32_to_cpu(summary->cln_mkr);
 510                         jeb->first_node = jeb->last_node = marker_ref;
 511
 512                         USED_SPACE( PAD(je32_to_cpu(summary->cln_mkr)) );
 513                 }
 514         }
 515
 516         if (je32_to_cpu(summary->padded)) {
 517                 DIRTY_SPACE(je32_to_cpu(summary->padded));
 518         }
 519
 520         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
 521         if (ret)
 522                 return ret;
 523
 524         /* for PARANOIA_CHECK */
 525         cache_ref = jffs2_alloc_raw_node_ref();
 526
 527         if (!cache_ref) {
 528                 JFFS2_NOTICE("Failed to allocate node ref for cache\n");
 529                 return -ENOMEM;
 530         }
 531
 532         cache_ref->next_in_ino = NULL;
 533         cache_ref->next_phys = NULL;
 534         cache_ref->flash_offset = ofs | REF_NORMAL;
 535         cache_ref->__totlen = sumsize;
 536
 537         if (!jeb->first_node)
 538                 jeb->first_node = cache_ref;
 539         if (jeb->last_node)
 540                 jeb->last_node->next_phys = cache_ref;
 541         jeb->last_node = cache_ref;
 542
 543         USED_SPACE(sumsize);
 544
 545         jeb->wasted_size += jeb->free_size;
 546         c->wasted_size += jeb->free_size;
 547         c->free_size -= jeb->free_size;
 548         jeb->free_size = 0;
 549
 550         return jffs2_scan_classify_jeb(c, jeb);
 551
 552 crc_err:
 553         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
 554
 555         return 0;
 556 }
 557
 558 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
 559
 560 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 561                                         uint32_t infosize, uint32_t datasize, int padsize)
 562 {
 563         struct jffs2_raw_summary isum;
 564         union jffs2_sum_mem *temp;
 565         struct jffs2_sum_marker *sm;
 566         struct kvec vecs[2];
 567         void *wpage;
 568         int ret;
 569         size_t retlen;
 570
 571         memset(c->summary->sum_buf, 0xff, datasize);
 572         memset(&isum, 0, sizeof(isum));
 573
 574         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 575         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 576         isum.totlen = cpu_to_je32(infosize);
 577         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
 578         isum.padded = cpu_to_je32(c->summary->sum_padded);
 579         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
 580         isum.sum_num = cpu_to_je32(c->summary->sum_num);
 581         wpage = c->summary->sum_buf;
 582
 583         while (c->summary->sum_num) {
 584
 585                 switch (je16_to_cpu(c->summary->sum_list_head->u.nodetype)) {
 586                         case JFFS2_NODETYPE_INODE: {
 587                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
 588
 589                                 sino_ptr->nodetype = c->summary->sum_list_head->i.nodetype;
 590                                 sino_ptr->inode = c->summary->sum_list_head->i.inode;
 591                                 sino_ptr->version = c->summary->sum_list_head->i.version;
 592                                 sino_ptr->offset = c->summary->sum_list_head->i.offset;
 593                                 sino_ptr->totlen = c->summary->sum_list_head->i.totlen;
 594
 595                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
 596
 597                                 break;
 598                         }
 599
 600                         case JFFS2_NODETYPE_DIRENT: {
 601                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
 602
 603                                 sdrnt_ptr->nodetype = c->summary->sum_list_head->d.nodetype;
 604                                 sdrnt_ptr->totlen = c->summary->sum_list_head->d.totlen;
 605                                 sdrnt_ptr->offset = c->summary->sum_list_head->d.offset;
 606                                 sdrnt_ptr->pino = c->summary->sum_list_head->d.pino;
 607                                 sdrnt_ptr->version = c->summary->sum_list_head->d.version;
 608                                 sdrnt_ptr->ino = c->summary->sum_list_head->d.ino;
 609                                 sdrnt_ptr->nsize = c->summary->sum_list_head->d.nsize;
 610                                 sdrnt_ptr->type = c->summary->sum_list_head->d.type;
 611
 612                                 memcpy(sdrnt_ptr->name, c->summary->sum_list_head->d.name,
 613                                                         c->summary->sum_list_head->d.nsize);
 614
 615                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(c->summary->sum_list_head->d.nsize);
 616
 617                                 break;
 618                         }
 619
 620                         default : {
 621                                 BUG();  /* unknown node in summary information */
 622                         }
 623                 }
 624
 625                 temp = c->summary->sum_list_head;
 626                 c->summary->sum_list_head = c->summary->sum_list_head->u.next;
 627                 kfree(temp);
 628
 629                 c->summary->sum_num--;
 630         }
 631
 632         jffs2_sum_reset_collected(c->summary);
 633
 634         wpage += padsize;
 635
 636         sm = wpage;
 637         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
 638         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
 639
 640         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
 641         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
 642
 643         vecs[0].iov_base = &isum;
 644         vecs[0].iov_len = sizeof(isum);
 645         vecs[1].iov_base = c->summary->sum_buf;
 646         vecs[1].iov_len = datasize;
 647
 648         dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
 649                         jeb->offset + c->sector_size - jeb->free_size);
 650
 651         spin_unlock(&c->erase_completion_lock);
 652         ret = jffs2_flash_writev(c, vecs, 2, jeb->offset + c->sector_size -
 653                                 jeb->free_size, &retlen, 0);
 654         spin_lock(&c->erase_completion_lock);
 655
 656
 657         if (ret || (retlen != infosize)) {
 658                 JFFS2_WARNING("Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n",
 659                         infosize, jeb->offset + c->sector_size - jeb->free_size, ret, retlen);
 660
 661                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 662                 WASTED_SPACE(infosize);
 663
 664                 return 1;
 665         }
 666
 667         return 0;
 668 }
 669
 670 /* Write out summary information - called from jffs2_do_reserve_space */
 671
 672 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
 673 {
 674         struct jffs2_raw_node_ref *summary_ref;
 675         int datasize, infosize, padsize, ret;
 676         struct jffs2_eraseblock *jeb;
 677
 678         dbg_summary("called\n");
 679
 680         jeb = c->nextblock;
 681
 682         if (!c->summary->sum_num || !c->summary->sum_list_head) {
 683                 JFFS2_WARNING("Empty summary info!!!\n");
 684                 BUG();
 685         }
 686
 687         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
 688         infosize = sizeof(struct jffs2_raw_summary) + datasize;
 689         padsize = jeb->free_size - infosize;
 690         infosize += padsize;
 691         datasize += padsize;
 692
 693         /* Is there enough space for summary? */
 694         if (padsize < 0) {
 695                 /* don't try to write out summary for this jeb */
 696                 jffs2_sum_disable_collecting(c->summary);
 697
 698                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
 699                 return 0;
 700         }
 701
 702         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
 703         if (ret)
 704                 return 0; /* can't write out summary, block is marked as NOSUM_SIZE */
 705
 706         /* for ACCT_PARANOIA_CHECK */
 707         spin_unlock(&c->erase_completion_lock);
 708         summary_ref = jffs2_alloc_raw_node_ref();
 709         spin_lock(&c->erase_completion_lock);
 710
 711         if (!summary_ref) {
 712                 JFFS2_NOTICE("Failed to allocate node ref for summary\n");
 713                 return -ENOMEM;
 714         }
 715
 716         summary_ref->next_in_ino = NULL;
 717         summary_ref->next_phys = NULL;
 718         summary_ref->flash_offset = (jeb->offset + c->sector_size - jeb->free_size) | REF_NORMAL;
 719         summary_ref->__totlen = infosize;
 720
 721         if (!jeb->first_node)
 722                 jeb->first_node = summary_ref;
 723         if (jeb->last_node)
 724                 jeb->last_node->next_phys = summary_ref;
 725         jeb->last_node = summary_ref;
 726
 727         USED_SPACE(infosize);
 728
 729         return 0;
 730 }