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   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 }