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  *               2006  KaiGai Kohei <kaigai@ak.jp.nec.com>
   9  *
  10  * For licensing information, see the file 'LICENCE' in this directory.
  11  *
  12  * $Id: summary.c,v 1.4 2005/09/26 11:37:21 havasi Exp $
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/sched.h>
  18 #include <linux/slab.h>
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/pagemap.h>
  21 #include <linux/crc32.h>
  22 #include <linux/compiler.h>
  23 #include <linux/vmalloc.h>
  24 #include "nodelist.h"
  25 #include "debug.h"
  26
  27 int jffs2_sum_init(struct jffs2_sb_info *c)
  28 {
  29         c->summary = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
  30
  31         if (!c->summary) {
  32                 JFFS2_WARNING("Can't allocate memory for summary information!\n");
  33                 return -ENOMEM;
  34         }
  35
  36         c->summary->sum_buf = vmalloc(c->sector_size);
  37
  38         if (!c->summary->sum_buf) {
  39                 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
  40                 kfree(c->summary);
  41                 return -ENOMEM;
  42         }
  43
  44         dbg_summary("returned successfully\n");
  45
  46         return 0;
  47 }
  48
  49 void jffs2_sum_exit(struct jffs2_sb_info *c)
  50 {
  51         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                         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                         dbg_summary("dirent (%u) added to summary\n",
  81                                                 je32_to_cpu(item->d.ino));
  82                         break;
  83 #ifdef CONFIG_JFFS2_FS_XATTR
  84                 case JFFS2_NODETYPE_XATTR:
  85                         s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
  86                         s->sum_num++;
  87                         dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
  88                                     je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
  89                         break;
  90                 case JFFS2_NODETYPE_XREF:
  91                         s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
  92                         s->sum_num++;
  93                         dbg_summary("xref added to summary\n");
  94                         break;
  95 #endif
  96                 default:
  97                         JFFS2_WARNING("UNKNOWN node type %u\n",
  98                                             je16_to_cpu(item->u.nodetype));
  99                         return 1;
 100         }
 101         return 0;
 102 }
 103
 104
 105 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
 106
 107 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
 108 {
 109         dbg_summary("called with %u\n", size);
 110         s->sum_padded += size;
 111         return 0;
 112 }
 113
 114 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
 115                                 uint32_t ofs)
 116 {
 117         struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
 118
 119         if (!temp)
 120                 return -ENOMEM;
 121
 122         temp->nodetype = ri->nodetype;
 123         temp->inode = ri->ino;
 124         temp->version = ri->version;
 125         temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */
 126         temp->totlen = ri->totlen;
 127         temp->next = NULL;
 128
 129         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 130 }
 131
 132 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
 133                                 uint32_t ofs)
 134 {
 135         struct jffs2_sum_dirent_mem *temp =
 136                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
 137
 138         if (!temp)
 139                 return -ENOMEM;
 140
 141         temp->nodetype = rd->nodetype;
 142         temp->totlen = rd->totlen;
 143         temp->offset = cpu_to_je32(ofs);        /* relative from the begining of the jeb */
 144         temp->pino = rd->pino;
 145         temp->version = rd->version;
 146         temp->ino = rd->ino;
 147         temp->nsize = rd->nsize;
 148         temp->type = rd->type;
 149         temp->next = NULL;
 150
 151         memcpy(temp->name, rd->name, rd->nsize);
 152
 153         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 154 }
 155
 156 #ifdef CONFIG_JFFS2_FS_XATTR
 157 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
 158 {
 159         struct jffs2_sum_xattr_mem *temp;
 160
 161         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
 162         if (!temp)
 163                 return -ENOMEM;
 164
 165         temp->nodetype = rx->nodetype;
 166         temp->xid = rx->xid;
 167         temp->version = rx->version;
 168         temp->offset = cpu_to_je32(ofs);
 169         temp->totlen = rx->totlen;
 170         temp->next = NULL;
 171
 172         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 173 }
 174
 175 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
 176 {
 177         struct jffs2_sum_xref_mem *temp;
 178
 179         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
 180         if (!temp)
 181                 return -ENOMEM;
 182
 183         temp->nodetype = rr->nodetype;
 184         temp->offset = cpu_to_je32(ofs);
 185         temp->next = NULL;
 186
 187         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 188 }
 189 #endif
 190 /* Cleanup every collected summary information */
 191
 192 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
 193 {
 194         union jffs2_sum_mem *temp;
 195
 196         if (!s->sum_list_head) {
 197                 dbg_summary("already empty\n");
 198         }
 199         while (s->sum_list_head) {
 200                 temp = s->sum_list_head;
 201                 s->sum_list_head = s->sum_list_head->u.next;
 202                 kfree(temp);
 203         }
 204         s->sum_list_tail = NULL;
 205         s->sum_padded = 0;
 206         s->sum_num = 0;
 207 }
 208
 209 void jffs2_sum_reset_collected(struct jffs2_summary *s)
 210 {
 211         dbg_summary("called\n");
 212         jffs2_sum_clean_collected(s);
 213         s->sum_size = 0;
 214 }
 215
 216 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
 217 {
 218         dbg_summary("called\n");
 219         jffs2_sum_clean_collected(s);
 220         s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 221 }
 222
 223 int jffs2_sum_is_disabled(struct jffs2_summary *s)
 224 {
 225         return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
 226 }
 227
 228 /* Move the collected summary information into sb (called from scan.c) */
 229
 230 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
 231 {
 232         dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
 233                                 c->summary->sum_size, c->summary->sum_num,
 234                                 s->sum_size, s->sum_num);
 235
 236         c->summary->sum_size = s->sum_size;
 237         c->summary->sum_num = s->sum_num;
 238         c->summary->sum_padded = s->sum_padded;
 239         c->summary->sum_list_head = s->sum_list_head;
 240         c->summary->sum_list_tail = s->sum_list_tail;
 241
 242         s->sum_list_head = s->sum_list_tail = NULL;
 243 }
 244
 245 /* Called from wbuf.c to collect writed node info */
 246
 247 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
 248                                 unsigned long count, uint32_t ofs)
 249 {
 250         union jffs2_node_union *node;
 251         struct jffs2_eraseblock *jeb;
 252
 253         if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) {
 254                 dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n");
 255                 return 0;
 256         }
 257
 258         node = invecs[0].iov_base;
 259         jeb = &c->blocks[ofs / c->sector_size];
 260         ofs -= jeb->offset;
 261
 262         switch (je16_to_cpu(node->u.nodetype)) {
 263                 case JFFS2_NODETYPE_INODE: {
 264                         struct jffs2_sum_inode_mem *temp =
 265                                 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
 266
 267                         if (!temp)
 268                                 goto no_mem;
 269
 270                         temp->nodetype = node->i.nodetype;
 271                         temp->inode = node->i.ino;
 272                         temp->version = node->i.version;
 273                         temp->offset = cpu_to_je32(ofs);
 274                         temp->totlen = node->i.totlen;
 275                         temp->next = NULL;
 276
 277                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 278                 }
 279
 280                 case JFFS2_NODETYPE_DIRENT: {
 281                         struct jffs2_sum_dirent_mem *temp =
 282                                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
 283
 284                         if (!temp)
 285                                 goto no_mem;
 286
 287                         temp->nodetype = node->d.nodetype;
 288                         temp->totlen = node->d.totlen;
 289                         temp->offset = cpu_to_je32(ofs);
 290                         temp->pino = node->d.pino;
 291                         temp->version = node->d.version;
 292                         temp->ino = node->d.ino;
 293                         temp->nsize = node->d.nsize;
 294                         temp->type = node->d.type;
 295                         temp->next = NULL;
 296
 297                         switch (count) {
 298                                 case 1:
 299                                         memcpy(temp->name,node->d.name,node->d.nsize);
 300                                         break;
 301
 302                                 case 2:
 303                                         memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
 304                                         break;
 305
 306                                 default:
 307                                         BUG();  /* impossible count value */
 308                                         break;
 309                         }
 310
 311                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 312                 }
 313 #ifdef CONFIG_JFFS2_FS_XATTR
 314                 case JFFS2_NODETYPE_XATTR: {
 315                         struct jffs2_sum_xattr_mem *temp;
 316                         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
 317                         if (!temp)
 318                                 goto no_mem;
 319
 320                         temp->nodetype = node->x.nodetype;
 321                         temp->xid = node->x.xid;
 322                         temp->version = node->x.version;
 323                         temp->totlen = node->x.totlen;
 324                         temp->offset = cpu_to_je32(ofs);
 325                         temp->next = NULL;
 326
 327                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 328                 }
 329                 case JFFS2_NODETYPE_XREF: {
 330                         struct jffs2_sum_xref_mem *temp;
 331                         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
 332                         if (!temp)
 333                                 goto no_mem;
 334                         temp->nodetype = node->r.nodetype;
 335                         temp->offset = cpu_to_je32(ofs);
 336                         temp->next = NULL;
 337
 338                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 339                 }
 340 #endif
 341                 case JFFS2_NODETYPE_PADDING:
 342                         dbg_summary("node PADDING\n");
 343                         c->summary->sum_padded += je32_to_cpu(node->u.totlen);
 344                         break;
 345
 346                 case JFFS2_NODETYPE_CLEANMARKER:
 347                         dbg_summary("node CLEANMARKER\n");
 348                         break;
 349
 350                 case JFFS2_NODETYPE_SUMMARY:
 351                         dbg_summary("node SUMMARY\n");
 352                         break;
 353
 354                 default:
 355                         /* If you implement a new node type you should also implement
 356                            summary support for it or disable summary.
 357                         */
 358                         BUG();
 359                         break;
 360         }
 361
 362         return 0;
 363
 364 no_mem:
 365         JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
 366         return -ENOMEM;
 367 }
 368
 369 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
 370                                                     struct jffs2_eraseblock *jeb,
 371                                                     uint32_t ofs, uint32_t len,
 372                                                     struct jffs2_inode_cache *ic)
 373 {
 374         /* If there was a gap, mark it dirty */
 375         if ((ofs & ~3) > c->sector_size - jeb->free_size) {
 376                 /* Ew. Summary doesn't actually tell us explicitly about dirty space */
 377                 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
 378         }
 379
 380         return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
 381 }
 382
 383 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
 384
 385 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 386                                 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
 387 {
 388         struct jffs2_inode_cache *ic;
 389         struct jffs2_full_dirent *fd;
 390         void *sp;
 391         int i, ino;
 392         int err;
 393
 394         sp = summary->sum;
 395
 396         for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
 397                 dbg_summary("processing summary index %d\n", i);
 398
 399                 cond_resched();
 400
 401                 /* Make sure there's a spare ref for dirty space */
 402                 err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
 403                 if (err)
 404                         return err;
 405
 406                 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
 407                         case JFFS2_NODETYPE_INODE: {
 408                                 struct jffs2_sum_inode_flash *spi;
 409                                 spi = sp;
 410
 411                                 ino = je32_to_cpu(spi->inode);
 412
 413                                 dbg_summary("Inode at 0x%08x-0x%08x\n",
 414                                             jeb->offset + je32_to_cpu(spi->offset),
 415                                             jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
 416
 417                                 ic = jffs2_scan_make_ino_cache(c, ino);
 418                                 if (!ic) {
 419                                         JFFS2_NOTICE("scan_make_ino_cache failed\n");
 420                                         return -ENOMEM;
 421                                 }
 422
 423                                 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
 424                                                   PAD(je32_to_cpu(spi->totlen)), ic);
 425
 426                                 *pseudo_random += je32_to_cpu(spi->version);
 427
 428                                 sp += JFFS2_SUMMARY_INODE_SIZE;
 429
 430                                 break;
 431                         }
 432
 433                         case JFFS2_NODETYPE_DIRENT: {
 434                                 struct jffs2_sum_dirent_flash *spd;
 435                                 spd = sp;
 436
 437                                 dbg_summary("Dirent at 0x%08x-0x%08x\n",
 438                                             jeb->offset + je32_to_cpu(spd->offset),
 439                                             jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
 440
 441
 442                                 fd = jffs2_alloc_full_dirent(spd->nsize+1);
 443                                 if (!fd)
 444                                         return -ENOMEM;
 445
 446                                 memcpy(&fd->name, spd->name, spd->nsize);
 447                                 fd->name[spd->nsize] = 0;
 448
 449                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
 450                                 if (!ic) {
 451                                         jffs2_free_full_dirent(fd);
 452                                         return -ENOMEM;
 453                                 }
 454
 455                                 fd->raw = sum_link_node_ref(c, jeb,  je32_to_cpu(spd->offset) | REF_UNCHECKED,
 456                                                             PAD(je32_to_cpu(spd->totlen)), ic);
 457
 458                                 fd->next = NULL;
 459                                 fd->version = je32_to_cpu(spd->version);
 460                                 fd->ino = je32_to_cpu(spd->ino);
 461                                 fd->nhash = full_name_hash(fd->name, spd->nsize);
 462                                 fd->type = spd->type;
 463
 464                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
 465
 466                                 *pseudo_random += je32_to_cpu(spd->version);
 467
 468                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
 469
 470                                 break;
 471                         }
 472 #ifdef CONFIG_JFFS2_FS_XATTR
 473                         case JFFS2_NODETYPE_XATTR: {
 474                                 struct jffs2_xattr_datum *xd;
 475                                 struct jffs2_sum_xattr_flash *spx;
 476
 477                                 spx = (struct jffs2_sum_xattr_flash *)sp;
 478                                 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n",
 479                                             jeb->offset + je32_to_cpu(spx->offset),
 480                                             jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
 481                                             je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
 482
 483                                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
 484                                                                 je32_to_cpu(spx->version));
 485                                 if (IS_ERR(xd))
 486                                         return PTR_ERR(xd);
 487                                 if (xd->version > je32_to_cpu(spx->version)) {
 488                                         /* node is not the newest one */
 489                                         struct jffs2_raw_node_ref *raw
 490                                                 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
 491                                                                     PAD(je32_to_cpu(spx->totlen)), NULL);
 492                                         raw->next_in_ino = xd->node->next_in_ino;
 493                                         xd->node->next_in_ino = raw;
 494                                 } else {
 495                                         xd->version = je32_to_cpu(spx->version);
 496                                         sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
 497                                                           PAD(je32_to_cpu(spx->totlen)), (void *)xd);
 498                                 }
 499                                 *pseudo_random += je32_to_cpu(spx->xid);
 500                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
 501
 502                                 break;
 503                         }
 504                         case JFFS2_NODETYPE_XREF: {
 505                                 struct jffs2_xattr_ref *ref;
 506                                 struct jffs2_sum_xref_flash *spr;
 507
 508                                 spr = (struct jffs2_sum_xref_flash *)sp;
 509                                 dbg_summary("xref at %#08x-%#08x\n",
 510                                             jeb->offset + je32_to_cpu(spr->offset),
 511                                             jeb->offset + je32_to_cpu(spr->offset) +
 512                                             (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
 513
 514                                 ref = jffs2_alloc_xattr_ref();
 515                                 if (!ref) {
 516                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
 517                                         return -ENOMEM;
 518                                 }
 519                                 ref->next = c->xref_temp;
 520                                 c->xref_temp = ref;
 521
 522                                 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
 523                                                   PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
 524
 525                                 *pseudo_random += ref->node->flash_offset;
 526                                 sp += JFFS2_SUMMARY_XREF_SIZE;
 527
 528                                 break;
 529                         }
 530 #endif
 531                         default : {
 532                                 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
 533                                 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
 534                                 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
 535                                         return -EIO;
 536
 537                                 /* For compatible node types, just fall back to the full scan */
 538                                 c->wasted_size -= jeb->wasted_size;
 539                                 c->free_size += c->sector_size - jeb->free_size;
 540                                 c->used_size -= jeb->used_size;
 541                                 c->dirty_size -= jeb->dirty_size;
 542                                 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
 543                                 jeb->free_size = c->sector_size;
 544
 545                                 jffs2_free_jeb_node_refs(c, jeb);
 546                                 return -ENOTRECOVERABLE;
 547                         }
 548                 }
 549         }
 550         return 0;
 551 }
 552
 553 /* Process the summary node - called from jffs2_scan_eraseblock() */
 554 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 555                            struct jffs2_raw_summary *summary, uint32_t sumsize,
 556                            uint32_t *pseudo_random)
 557 {
 558         struct jffs2_unknown_node crcnode;
 559         int ret, ofs;
 560         uint32_t crc;
 561
 562         ofs = c->sector_size - sumsize;
 563
 564         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
 565                     jeb->offset, jeb->offset + ofs, sumsize);
 566
 567         /* OK, now check for node validity and CRC */
 568         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 569         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 570         crcnode.totlen = summary->totlen;
 571         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
 572
 573         if (je32_to_cpu(summary->hdr_crc) != crc) {
 574                 dbg_summary("Summary node header is corrupt (bad CRC or "
 575                                 "no summary at all)\n");
 576                 goto crc_err;
 577         }
 578
 579         if (je32_to_cpu(summary->totlen) != sumsize) {
 580                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
 581                 goto crc_err;
 582         }
 583
 584         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
 585
 586         if (je32_to_cpu(summary->node_crc) != crc) {
 587                 dbg_summary("Summary node is corrupt (bad CRC)\n");
 588                 goto crc_err;
 589         }
 590
 591         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
 592
 593         if (je32_to_cpu(summary->sum_crc) != crc) {
 594                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
 595                 goto crc_err;
 596         }
 597
 598         if ( je32_to_cpu(summary->cln_mkr) ) {
 599
 600                 dbg_summary("Summary : CLEANMARKER node \n");
 601
 602                 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
 603                 if (ret)
 604                         return ret;
 605
 606                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
 607                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
 608                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
 609                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
 610                                 return ret;
 611                 } else if (jeb->first_node) {
 612                         dbg_summary("CLEANMARKER node not first node in block "
 613                                         "(0x%08x)\n", jeb->offset);
 614                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
 615                                 return ret;
 616                 } else {
 617                         jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
 618                                             je32_to_cpu(summary->cln_mkr), NULL);
 619                 }
 620         }
 621
 622         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
 623         /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
 624            scan of this eraseblock. So return zero */
 625         if (ret == -ENOTRECOVERABLE)
 626                 return 0;
 627         if (ret)
 628                 return ret;             /* real error */
 629
 630         /* for PARANOIA_CHECK */
 631         ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
 632         if (ret)
 633                 return ret;
 634
 635         sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
 636
 637         if (unlikely(jeb->free_size)) {
 638                 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
 639                               jeb->free_size, jeb->offset);
 640                 jeb->wasted_size += jeb->free_size;
 641                 c->wasted_size += jeb->free_size;
 642                 c->free_size -= jeb->free_size;
 643                 jeb->free_size = 0;
 644         }
 645
 646         return jffs2_scan_classify_jeb(c, jeb);
 647
 648 crc_err:
 649         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
 650
 651         return 0;
 652 }
 653
 654 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
 655
 656 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 657                                         uint32_t infosize, uint32_t datasize, int padsize)
 658 {
 659         struct jffs2_raw_summary isum;
 660         union jffs2_sum_mem *temp;
 661         struct jffs2_sum_marker *sm;
 662         struct kvec vecs[2];
 663         uint32_t sum_ofs;
 664         void *wpage;
 665         int ret;
 666         size_t retlen;
 667
 668         memset(c->summary->sum_buf, 0xff, datasize);
 669         memset(&isum, 0, sizeof(isum));
 670
 671         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 672         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 673         isum.totlen = cpu_to_je32(infosize);
 674         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
 675         isum.padded = cpu_to_je32(c->summary->sum_padded);
 676         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
 677         isum.sum_num = cpu_to_je32(c->summary->sum_num);
 678         wpage = c->summary->sum_buf;
 679
 680         while (c->summary->sum_num) {
 681                 temp = c->summary->sum_list_head;
 682
 683                 switch (je16_to_cpu(temp->u.nodetype)) {
 684                         case JFFS2_NODETYPE_INODE: {
 685                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
 686
 687                                 sino_ptr->nodetype = temp->i.nodetype;
 688                                 sino_ptr->inode = temp->i.inode;
 689                                 sino_ptr->version = temp->i.version;
 690                                 sino_ptr->offset = temp->i.offset;
 691                                 sino_ptr->totlen = temp->i.totlen;
 692
 693                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
 694
 695                                 break;
 696                         }
 697
 698                         case JFFS2_NODETYPE_DIRENT: {
 699                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
 700
 701                                 sdrnt_ptr->nodetype = temp->d.nodetype;
 702                                 sdrnt_ptr->totlen = temp->d.totlen;
 703                                 sdrnt_ptr->offset = temp->d.offset;
 704                                 sdrnt_ptr->pino = temp->d.pino;
 705                                 sdrnt_ptr->version = temp->d.version;
 706                                 sdrnt_ptr->ino = temp->d.ino;
 707                                 sdrnt_ptr->nsize = temp->d.nsize;
 708                                 sdrnt_ptr->type = temp->d.type;
 709
 710                                 memcpy(sdrnt_ptr->name, temp->d.name,
 711                                                         temp->d.nsize);
 712
 713                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
 714
 715                                 break;
 716                         }
 717 #ifdef CONFIG_JFFS2_FS_XATTR
 718                         case JFFS2_NODETYPE_XATTR: {
 719                                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
 720
 721                                 temp = c->summary->sum_list_head;
 722                                 sxattr_ptr->nodetype = temp->x.nodetype;
 723                                 sxattr_ptr->xid = temp->x.xid;
 724                                 sxattr_ptr->version = temp->x.version;
 725                                 sxattr_ptr->offset = temp->x.offset;
 726                                 sxattr_ptr->totlen = temp->x.totlen;
 727
 728                                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
 729                                 break;
 730                         }
 731                         case JFFS2_NODETYPE_XREF: {
 732                                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
 733
 734                                 temp = c->summary->sum_list_head;
 735                                 sxref_ptr->nodetype = temp->r.nodetype;
 736                                 sxref_ptr->offset = temp->r.offset;
 737
 738                                 wpage += JFFS2_SUMMARY_XREF_SIZE;
 739                                 break;
 740                         }
 741 #endif
 742                         default : {
 743                                 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
 744                                     == JFFS2_FEATURE_RWCOMPAT_COPY) {
 745                                         dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
 746                                                     je16_to_cpu(temp->u.nodetype));
 747                                         jffs2_sum_disable_collecting(c->summary);
 748                                 } else {
 749                                         BUG();  /* unknown node in summary information */
 750                                 }
 751                         }
 752                 }
 753
 754                 c->summary->sum_list_head = temp->u.next;
 755                 kfree(temp);
 756
 757                 c->summary->sum_num--;
 758         }
 759
 760         jffs2_sum_reset_collected(c->summary);
 761
 762         wpage += padsize;
 763
 764         sm = wpage;
 765         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
 766         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
 767
 768         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
 769         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
 770
 771         vecs[0].iov_base = &isum;
 772         vecs[0].iov_len = sizeof(isum);
 773         vecs[1].iov_base = c->summary->sum_buf;
 774         vecs[1].iov_len = datasize;
 775
 776         sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
 777
 778         dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
 779                     sum_ofs);
 780
 781         ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
 782
 783         if (ret || (retlen != infosize)) {
 784
 785                 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
 786                               infosize, sum_ofs, ret, retlen);
 787
 788                 if (retlen) {
 789                         /* Waste remaining space */
 790                         spin_lock(&c->erase_completion_lock);
 791                         jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
 792                         spin_unlock(&c->erase_completion_lock);
 793                 }
 794
 795                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 796
 797                 return 0;
 798         }
 799
 800         spin_lock(&c->erase_completion_lock);
 801         jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
 802         spin_unlock(&c->erase_completion_lock);
 803
 804         return 0;
 805 }
 806
 807 /* Write out summary information - called from jffs2_do_reserve_space */
 808
 809 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
 810 {
 811         int datasize, infosize, padsize;
 812         struct jffs2_eraseblock *jeb;
 813         int ret;
 814
 815         dbg_summary("called\n");
 816
 817         spin_unlock(&c->erase_completion_lock);
 818
 819         jeb = c->nextblock;
 820         jffs2_prealloc_raw_node_refs(c, jeb, 1);
 821
 822         if (!c->summary->sum_num || !c->summary->sum_list_head) {
 823                 JFFS2_WARNING("Empty summary info!!!\n");
 824                 BUG();
 825         }
 826
 827         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
 828         infosize = sizeof(struct jffs2_raw_summary) + datasize;
 829         padsize = jeb->free_size - infosize;
 830         infosize += padsize;
 831         datasize += padsize;
 832
 833         /* Is there enough space for summary? */
 834         if (padsize < 0) {
 835                 /* don't try to write out summary for this jeb */
 836                 jffs2_sum_disable_collecting(c->summary);
 837
 838                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
 839                 spin_lock(&c->erase_completion_lock);
 840                 return 0;
 841         }
 842
 843         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
 844         spin_lock(&c->erase_completion_lock);
 845         return ret;
 846 }