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  *               2005  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 = kmalloc(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         memset(c->summary, 0, sizeof(struct jffs2_summary));
  37
  38         c->summary->sum_buf = vmalloc(c->sector_size);
  39
  40         if (!c->summary->sum_buf) {
  41                 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
  42                 kfree(c->summary);
  43                 return -ENOMEM;
  44         }
  45
  46         dbg_summary("returned succesfully\n");
  47
  48         return 0;
  49 }
  50
  51 void jffs2_sum_exit(struct jffs2_sb_info *c)
  52 {
  53         dbg_summary("called\n");
  54
  55         jffs2_sum_disable_collecting(c->summary);
  56
  57         vfree(c->summary->sum_buf);
  58         c->summary->sum_buf = NULL;
  59
  60         kfree(c->summary);
  61         c->summary = NULL;
  62 }
  63
  64 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
  65 {
  66         if (!s->sum_list_head)
  67                 s->sum_list_head = (union jffs2_sum_mem *) item;
  68         if (s->sum_list_tail)
  69                 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
  70         s->sum_list_tail = (union jffs2_sum_mem *) item;
  71
  72         switch (je16_to_cpu(item->u.nodetype)) {
  73                 case JFFS2_NODETYPE_INODE:
  74                         s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
  75                         s->sum_num++;
  76                         dbg_summary("inode (%u) added to summary\n",
  77                                                 je32_to_cpu(item->i.inode));
  78                         break;
  79                 case JFFS2_NODETYPE_DIRENT:
  80                         s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
  81                         s->sum_num++;
  82                         dbg_summary("dirent (%u) added to summary\n",
  83                                                 je32_to_cpu(item->d.ino));
  84                         break;
  85 #ifdef CONFIG_JFFS2_FS_XATTR
  86                 case JFFS2_NODETYPE_XATTR:
  87                         s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
  88                         s->sum_num++;
  89                         dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
  90                                     je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
  91                         break;
  92                 case JFFS2_NODETYPE_XREF:
  93                         s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
  94                         s->sum_num++;
  95                         dbg_summary("xref added to summary\n");
  96                         break;
  97 #endif
  98                 default:
  99                         JFFS2_WARNING("UNKNOWN node type %u\n",
 100                                             je16_to_cpu(item->u.nodetype));
 101                         return 1;
 102         }
 103         return 0;
 104 }
 105
 106
 107 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
 108
 109 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
 110 {
 111         dbg_summary("called with %u\n", size);
 112         s->sum_padded += size;
 113         return 0;
 114 }
 115
 116 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
 117                                 uint32_t ofs)
 118 {
 119         struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
 120
 121         if (!temp)
 122                 return -ENOMEM;
 123
 124         temp->nodetype = ri->nodetype;
 125         temp->inode = ri->ino;
 126         temp->version = ri->version;
 127         temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */
 128         temp->totlen = ri->totlen;
 129         temp->next = NULL;
 130
 131         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 132 }
 133
 134 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
 135                                 uint32_t ofs)
 136 {
 137         struct jffs2_sum_dirent_mem *temp =
 138                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
 139
 140         if (!temp)
 141                 return -ENOMEM;
 142
 143         temp->nodetype = rd->nodetype;
 144         temp->totlen = rd->totlen;
 145         temp->offset = cpu_to_je32(ofs);        /* relative from the begining of the jeb */
 146         temp->pino = rd->pino;
 147         temp->version = rd->version;
 148         temp->ino = rd->ino;
 149         temp->nsize = rd->nsize;
 150         temp->type = rd->type;
 151         temp->next = NULL;
 152
 153         memcpy(temp->name, rd->name, rd->nsize);
 154
 155         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 156 }
 157
 158 #ifdef CONFIG_JFFS2_FS_XATTR
 159 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
 160 {
 161         struct jffs2_sum_xattr_mem *temp;
 162
 163         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
 164         if (!temp)
 165                 return -ENOMEM;
 166
 167         temp->nodetype = rx->nodetype;
 168         temp->xid = rx->xid;
 169         temp->version = rx->version;
 170         temp->offset = cpu_to_je32(ofs);
 171         temp->totlen = rx->totlen;
 172         temp->next = NULL;
 173
 174         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 175 }
 176
 177 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
 178 {
 179         struct jffs2_sum_xref_mem *temp;
 180
 181         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
 182         if (!temp)
 183                 return -ENOMEM;
 184
 185         temp->nodetype = rr->nodetype;
 186         temp->offset = cpu_to_je32(ofs);
 187         temp->next = NULL;
 188
 189         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 190 }
 191 #endif
 192 /* Cleanup every collected summary information */
 193
 194 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
 195 {
 196         union jffs2_sum_mem *temp;
 197
 198         if (!s->sum_list_head) {
 199                 dbg_summary("already empty\n");
 200         }
 201         while (s->sum_list_head) {
 202                 temp = s->sum_list_head;
 203                 s->sum_list_head = s->sum_list_head->u.next;
 204                 kfree(temp);
 205         }
 206         s->sum_list_tail = NULL;
 207         s->sum_padded = 0;
 208         s->sum_num = 0;
 209 }
 210
 211 void jffs2_sum_reset_collected(struct jffs2_summary *s)
 212 {
 213         dbg_summary("called\n");
 214         jffs2_sum_clean_collected(s);
 215         s->sum_size = 0;
 216 }
 217
 218 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
 219 {
 220         dbg_summary("called\n");
 221         jffs2_sum_clean_collected(s);
 222         s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 223 }
 224
 225 int jffs2_sum_is_disabled(struct jffs2_summary *s)
 226 {
 227         return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
 228 }
 229
 230 /* Move the collected summary information into sb (called from scan.c) */
 231
 232 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
 233 {
 234         dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
 235                                 c->summary->sum_size, c->summary->sum_num,
 236                                 s->sum_size, s->sum_num);
 237
 238         c->summary->sum_size = s->sum_size;
 239         c->summary->sum_num = s->sum_num;
 240         c->summary->sum_padded = s->sum_padded;
 241         c->summary->sum_list_head = s->sum_list_head;
 242         c->summary->sum_list_tail = s->sum_list_tail;
 243
 244         s->sum_list_head = s->sum_list_tail = NULL;
 245 }
 246
 247 /* Called from wbuf.c to collect writed node info */
 248
 249 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
 250                                 unsigned long count, uint32_t ofs)
 251 {
 252         union jffs2_node_union *node;
 253         struct jffs2_eraseblock *jeb;
 254
 255         node = invecs[0].iov_base;
 256         jeb = &c->blocks[ofs / c->sector_size];
 257         ofs -= jeb->offset;
 258
 259         switch (je16_to_cpu(node->u.nodetype)) {
 260                 case JFFS2_NODETYPE_INODE: {
 261                         struct jffs2_sum_inode_mem *temp =
 262                                 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
 263
 264                         if (!temp)
 265                                 goto no_mem;
 266
 267                         temp->nodetype = node->i.nodetype;
 268                         temp->inode = node->i.ino;
 269                         temp->version = node->i.version;
 270                         temp->offset = cpu_to_je32(ofs);
 271                         temp->totlen = node->i.totlen;
 272                         temp->next = NULL;
 273
 274                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 275                 }
 276
 277                 case JFFS2_NODETYPE_DIRENT: {
 278                         struct jffs2_sum_dirent_mem *temp =
 279                                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
 280
 281                         if (!temp)
 282                                 goto no_mem;
 283
 284                         temp->nodetype = node->d.nodetype;
 285                         temp->totlen = node->d.totlen;
 286                         temp->offset = cpu_to_je32(ofs);
 287                         temp->pino = node->d.pino;
 288                         temp->version = node->d.version;
 289                         temp->ino = node->d.ino;
 290                         temp->nsize = node->d.nsize;
 291                         temp->type = node->d.type;
 292                         temp->next = NULL;
 293
 294                         switch (count) {
 295                                 case 1:
 296                                         memcpy(temp->name,node->d.name,node->d.nsize);
 297                                         break;
 298
 299                                 case 2:
 300                                         memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
 301                                         break;
 302
 303                                 default:
 304                                         BUG();  /* impossible count value */
 305                                         break;
 306                         }
 307
 308                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 309                 }
 310 #ifdef CONFIG_JFFS2_FS_XATTR
 311                 case JFFS2_NODETYPE_XATTR: {
 312                         struct jffs2_sum_xattr_mem *temp;
 313                         if (je32_to_cpu(node->x.version) == 0xffffffff)
 314                                 return 0;
 315                         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
 316                         if (!temp)
 317                                 goto no_mem;
 318
 319                         temp->nodetype = node->x.nodetype;
 320                         temp->xid = node->x.xid;
 321                         temp->version = node->x.version;
 322                         temp->totlen = node->x.totlen;
 323                         temp->offset = cpu_to_je32(ofs);
 324                         temp->next = NULL;
 325
 326                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 327                 }
 328                 case JFFS2_NODETYPE_XREF: {
 329                         struct jffs2_sum_xref_mem *temp;
 330
 331                         if (je32_to_cpu(node->r.ino) == 0xffffffff
 332                             && je32_to_cpu(node->r.xid) == 0xffffffff)
 333                                 return 0;
 334                         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
 335                         if (!temp)
 336                                 goto no_mem;
 337                         temp->nodetype = node->r.nodetype;
 338                         temp->offset = cpu_to_je32(ofs);
 339                         temp->next = NULL;
 340
 341                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 342                 }
 343 #endif
 344                 case JFFS2_NODETYPE_PADDING:
 345                         dbg_summary("node PADDING\n");
 346                         c->summary->sum_padded += je32_to_cpu(node->u.totlen);
 347                         break;
 348
 349                 case JFFS2_NODETYPE_CLEANMARKER:
 350                         dbg_summary("node CLEANMARKER\n");
 351                         break;
 352
 353                 case JFFS2_NODETYPE_SUMMARY:
 354                         dbg_summary("node SUMMARY\n");
 355                         break;
 356
 357                 default:
 358                         /* If you implement a new node type you should also implement
 359                            summary support for it or disable summary.
 360                         */
 361                         BUG();
 362                         break;
 363         }
 364
 365         return 0;
 366
 367 no_mem:
 368         JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
 369         return -ENOMEM;
 370 }
 371
 372 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
 373                                                     struct jffs2_eraseblock *jeb,
 374                                                     uint32_t ofs, uint32_t len,
 375                                                     struct jffs2_inode_cache *ic)
 376 {
 377         /* If there was a gap, mark it dirty */
 378         if ((ofs & ~3) > c->sector_size - jeb->free_size) {
 379                 /* Ew. Summary doesn't actually tell us explicitly about dirty space */
 380                 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
 381         }
 382
 383         return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
 384 }
 385
 386 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
 387
 388 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 389                                 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
 390 {
 391         struct jffs2_inode_cache *ic;
 392         struct jffs2_full_dirent *fd;
 393         void *sp;
 394         int i, ino;
 395         int err;
 396
 397         sp = summary->sum;
 398
 399         for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
 400                 dbg_summary("processing summary index %d\n", i);
 401
 402                 /* Make sure there's a spare ref for dirty space */
 403                 err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
 404                 if (err)
 405                         return err;
 406
 407                 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
 408                         case JFFS2_NODETYPE_INODE: {
 409                                 struct jffs2_sum_inode_flash *spi;
 410                                 spi = sp;
 411
 412                                 ino = je32_to_cpu(spi->inode);
 413
 414                                 dbg_summary("Inode at 0x%08x-0x%08x\n",
 415                                             jeb->offset + je32_to_cpu(spi->offset),
 416                                             jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
 417
 418                                 ic = jffs2_scan_make_ino_cache(c, ino);
 419                                 if (!ic) {
 420                                         JFFS2_NOTICE("scan_make_ino_cache failed\n");
 421                                         return -ENOMEM;
 422                                 }
 423
 424                                 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
 425                                                   PAD(je32_to_cpu(spi->totlen)), ic);
 426
 427                                 *pseudo_random += je32_to_cpu(spi->version);
 428
 429                                 sp += JFFS2_SUMMARY_INODE_SIZE;
 430
 431                                 break;
 432                         }
 433
 434                         case JFFS2_NODETYPE_DIRENT: {
 435                                 struct jffs2_sum_dirent_flash *spd;
 436                                 spd = sp;
 437
 438                                 dbg_summary("Dirent at 0x%08x-0x%08x\n",
 439                                             jeb->offset + je32_to_cpu(spd->offset),
 440                                             jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
 441
 442
 443                                 fd = jffs2_alloc_full_dirent(spd->nsize+1);
 444                                 if (!fd)
 445                                         return -ENOMEM;
 446
 447                                 memcpy(&fd->name, spd->name, spd->nsize);
 448                                 fd->name[spd->nsize] = 0;
 449
 450                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
 451                                 if (!ic) {
 452                                         jffs2_free_full_dirent(fd);
 453                                         return -ENOMEM;
 454                                 }
 455
 456                                 fd->raw = sum_link_node_ref(c, jeb,  je32_to_cpu(spd->offset) | REF_UNCHECKED,
 457                                                             PAD(je32_to_cpu(spd->totlen)), ic);
 458
 459                                 fd->next = NULL;
 460                                 fd->version = je32_to_cpu(spd->version);
 461                                 fd->ino = je32_to_cpu(spd->ino);
 462                                 fd->nhash = full_name_hash(fd->name, spd->nsize);
 463                                 fd->type = spd->type;
 464
 465                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
 466
 467                                 *pseudo_random += je32_to_cpu(spd->version);
 468
 469                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
 470
 471                                 break;
 472                         }
 473 #ifdef CONFIG_JFFS2_FS_XATTR
 474                         case JFFS2_NODETYPE_XATTR: {
 475                                 struct jffs2_xattr_datum *xd;
 476                                 struct jffs2_sum_xattr_flash *spx;
 477
 478                                 spx = (struct jffs2_sum_xattr_flash *)sp;
 479                                 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n",
 480                                             jeb->offset + je32_to_cpu(spx->offset),
 481                                             jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
 482                                             je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
 483
 484                                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
 485                                                                 je32_to_cpu(spx->version));
 486                                 if (IS_ERR(xd)) {
 487                                         if (PTR_ERR(xd) == -EEXIST) {
 488                                                 /* a newer version of xd exists */
 489                                                 if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(spx->totlen))))
 490                                                         return err;
 491                                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
 492                                                 break;
 493                                         }
 494                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
 495                                         return PTR_ERR(xd);
 496                                 }
 497
 498                                 xd->node = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
 499                                                              PAD(je32_to_cpu(spx->totlen)), NULL);
 500                                 /* FIXME */ xd->node->next_in_ino = (void *)xd;
 501
 502                                 *pseudo_random += je32_to_cpu(spx->xid);
 503                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
 504
 505                                 break;
 506                         }
 507                         case JFFS2_NODETYPE_XREF: {
 508                                 struct jffs2_xattr_ref *ref;
 509                                 struct jffs2_sum_xref_flash *spr;
 510
 511                                 spr = (struct jffs2_sum_xref_flash *)sp;
 512                                 dbg_summary("xref at %#08x-%#08x\n",
 513                                             jeb->offset + je32_to_cpu(spr->offset),
 514                                             jeb->offset + je32_to_cpu(spr->offset) +
 515                                             (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
 516
 517                                 ref = jffs2_alloc_xattr_ref();
 518                                 if (!ref) {
 519                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
 520                                         return -ENOMEM;
 521                                 }
 522                                 ref->ino = 0xfffffffe;
 523                                 ref->xid = 0xfffffffd;
 524                                 ref->next = c->xref_temp;
 525                                 c->xref_temp = ref;
 526
 527                                 ref->node = sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
 528                                                               PAD(sizeof(struct jffs2_raw_xref)), NULL);
 529                                 /* FIXME */ ref->node->next_in_ino = (void *)ref;
 530
 531                                 *pseudo_random += ref->node->flash_offset;
 532                                 sp += JFFS2_SUMMARY_XREF_SIZE;
 533
 534                                 break;
 535                         }
 536 #endif
 537                         default : {
 538                                 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
 539                                 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
 540                                 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
 541                                         return -EIO;
 542
 543                                 /* For compatible node types, just fall back to the full scan */
 544                                 c->wasted_size -= jeb->wasted_size;
 545                                 c->free_size += c->sector_size - jeb->free_size;
 546                                 c->used_size -= jeb->used_size;
 547                                 c->dirty_size -= jeb->dirty_size;
 548                                 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
 549                                 jeb->free_size = c->sector_size;
 550
 551                                 jffs2_free_jeb_node_refs(c, jeb);
 552                                 return -ENOTRECOVERABLE;
 553                         }
 554                 }
 555         }
 556         return 0;
 557 }
 558
 559 /* Process the summary node - called from jffs2_scan_eraseblock() */
 560 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 561                            struct jffs2_raw_summary *summary, uint32_t sumsize,
 562                            uint32_t *pseudo_random)
 563 {
 564         struct jffs2_unknown_node crcnode;
 565         int ret, ofs;
 566         uint32_t crc;
 567
 568         ofs = c->sector_size - sumsize;
 569
 570         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
 571                     jeb->offset, jeb->offset + ofs, sumsize);
 572
 573         /* OK, now check for node validity and CRC */
 574         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 575         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 576         crcnode.totlen = summary->totlen;
 577         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
 578
 579         if (je32_to_cpu(summary->hdr_crc) != crc) {
 580                 dbg_summary("Summary node header is corrupt (bad CRC or "
 581                                 "no summary at all)\n");
 582                 goto crc_err;
 583         }
 584
 585         if (je32_to_cpu(summary->totlen) != sumsize) {
 586                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
 587                 goto crc_err;
 588         }
 589
 590         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
 591
 592         if (je32_to_cpu(summary->node_crc) != crc) {
 593                 dbg_summary("Summary node is corrupt (bad CRC)\n");
 594                 goto crc_err;
 595         }
 596
 597         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
 598
 599         if (je32_to_cpu(summary->sum_crc) != crc) {
 600                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
 601                 goto crc_err;
 602         }
 603
 604         if ( je32_to_cpu(summary->cln_mkr) ) {
 605
 606                 dbg_summary("Summary : CLEANMARKER node \n");
 607
 608                 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
 609                 if (ret)
 610                         return ret;
 611
 612                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
 613                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
 614                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
 615                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
 616                                 return ret;
 617                 } else if (jeb->first_node) {
 618                         dbg_summary("CLEANMARKER node not first node in block "
 619                                         "(0x%08x)\n", jeb->offset);
 620                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
 621                                 return ret;
 622                 } else {
 623                         jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
 624                                             je32_to_cpu(summary->cln_mkr), NULL);
 625                 }
 626         }
 627
 628         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
 629         /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
 630            scan of this eraseblock. So return zero */
 631         if (ret == -ENOTRECOVERABLE)
 632                 return 0;
 633         if (ret)
 634                 return ret;             /* real error */
 635
 636         /* for PARANOIA_CHECK */
 637         ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
 638         if (ret)
 639                 return ret;
 640
 641         sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
 642
 643         if (unlikely(jeb->free_size)) {
 644                 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
 645                               jeb->free_size, jeb->offset);
 646                 jeb->wasted_size += jeb->free_size;
 647                 c->wasted_size += jeb->free_size;
 648                 c->free_size -= jeb->free_size;
 649                 jeb->free_size = 0;
 650         }
 651
 652         return jffs2_scan_classify_jeb(c, jeb);
 653
 654 crc_err:
 655         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
 656
 657         return 0;
 658 }
 659
 660 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
 661
 662 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 663                                         uint32_t infosize, uint32_t datasize, int padsize)
 664 {
 665         struct jffs2_raw_summary isum;
 666         union jffs2_sum_mem *temp;
 667         struct jffs2_sum_marker *sm;
 668         struct kvec vecs[2];
 669         uint32_t sum_ofs;
 670         void *wpage;
 671         int ret;
 672         size_t retlen;
 673
 674         memset(c->summary->sum_buf, 0xff, datasize);
 675         memset(&isum, 0, sizeof(isum));
 676
 677         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 678         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 679         isum.totlen = cpu_to_je32(infosize);
 680         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
 681         isum.padded = cpu_to_je32(c->summary->sum_padded);
 682         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
 683         isum.sum_num = cpu_to_je32(c->summary->sum_num);
 684         wpage = c->summary->sum_buf;
 685
 686         while (c->summary->sum_num) {
 687                 temp = c->summary->sum_list_head;
 688
 689                 switch (je16_to_cpu(temp->u.nodetype)) {
 690                         case JFFS2_NODETYPE_INODE: {
 691                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
 692
 693                                 sino_ptr->nodetype = temp->i.nodetype;
 694                                 sino_ptr->inode = temp->i.inode;
 695                                 sino_ptr->version = temp->i.version;
 696                                 sino_ptr->offset = temp->i.offset;
 697                                 sino_ptr->totlen = temp->i.totlen;
 698
 699                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
 700
 701                                 break;
 702                         }
 703
 704                         case JFFS2_NODETYPE_DIRENT: {
 705                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
 706
 707                                 sdrnt_ptr->nodetype = temp->d.nodetype;
 708                                 sdrnt_ptr->totlen = temp->d.totlen;
 709                                 sdrnt_ptr->offset = temp->d.offset;
 710                                 sdrnt_ptr->pino = temp->d.pino;
 711                                 sdrnt_ptr->version = temp->d.version;
 712                                 sdrnt_ptr->ino = temp->d.ino;
 713                                 sdrnt_ptr->nsize = temp->d.nsize;
 714                                 sdrnt_ptr->type = temp->d.type;
 715
 716                                 memcpy(sdrnt_ptr->name, temp->d.name,
 717                                                         temp->d.nsize);
 718
 719                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
 720
 721                                 break;
 722                         }
 723 #ifdef CONFIG_JFFS2_FS_XATTR
 724                         case JFFS2_NODETYPE_XATTR: {
 725                                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
 726
 727                                 temp = c->summary->sum_list_head;
 728                                 sxattr_ptr->nodetype = temp->x.nodetype;
 729                                 sxattr_ptr->xid = temp->x.xid;
 730                                 sxattr_ptr->version = temp->x.version;
 731                                 sxattr_ptr->offset = temp->x.offset;
 732                                 sxattr_ptr->totlen = temp->x.totlen;
 733
 734                                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
 735                                 break;
 736                         }
 737                         case JFFS2_NODETYPE_XREF: {
 738                                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
 739
 740                                 temp = c->summary->sum_list_head;
 741                                 sxref_ptr->nodetype = temp->r.nodetype;
 742                                 sxref_ptr->offset = temp->r.offset;
 743
 744                                 wpage += JFFS2_SUMMARY_XREF_SIZE;
 745                                 break;
 746                         }
 747 #endif
 748                         default : {
 749                                 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
 750                                     == JFFS2_FEATURE_RWCOMPAT_COPY) {
 751                                         dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
 752                                                     je16_to_cpu(temp->u.nodetype));
 753                                         jffs2_sum_disable_collecting(c->summary);
 754                                 } else {
 755                                         BUG();  /* unknown node in summary information */
 756                                 }
 757                         }
 758                 }
 759
 760                 c->summary->sum_list_head = temp->u.next;
 761                 kfree(temp);
 762
 763                 c->summary->sum_num--;
 764         }
 765
 766         jffs2_sum_reset_collected(c->summary);
 767
 768         wpage += padsize;
 769
 770         sm = wpage;
 771         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
 772         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
 773
 774         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
 775         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
 776
 777         vecs[0].iov_base = &isum;
 778         vecs[0].iov_len = sizeof(isum);
 779         vecs[1].iov_base = c->summary->sum_buf;
 780         vecs[1].iov_len = datasize;
 781
 782         sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
 783
 784         dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
 785                     sum_ofs);
 786
 787         ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
 788
 789         if (ret || (retlen != infosize)) {
 790
 791                 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
 792                               infosize, sum_ofs, ret, retlen);
 793
 794                 if (retlen) {
 795                         /* Waste remaining space */
 796                         spin_lock(&c->erase_completion_lock);
 797                         jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
 798                         spin_unlock(&c->erase_completion_lock);
 799                 }
 800
 801                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 802
 803                 return 0;
 804         }
 805
 806         spin_lock(&c->erase_completion_lock);
 807         jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
 808         spin_unlock(&c->erase_completion_lock);
 809
 810         return 0;
 811 }
 812
 813 /* Write out summary information - called from jffs2_do_reserve_space */
 814
 815 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
 816 {
 817         int datasize, infosize, padsize;
 818         struct jffs2_eraseblock *jeb;
 819         int ret;
 820
 821         dbg_summary("called\n");
 822
 823         spin_unlock(&c->erase_completion_lock);
 824
 825         jeb = c->nextblock;
 826         jffs2_prealloc_raw_node_refs(c, jeb, 1);
 827
 828         if (!c->summary->sum_num || !c->summary->sum_list_head) {
 829                 JFFS2_WARNING("Empty summary info!!!\n");
 830                 BUG();
 831         }
 832
 833         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
 834         infosize = sizeof(struct jffs2_raw_summary) + datasize;
 835         padsize = jeb->free_size - infosize;
 836         infosize += padsize;
 837         datasize += padsize;
 838
 839         /* Is there enough space for summary? */
 840         if (padsize < 0) {
 841                 /* don't try to write out summary for this jeb */
 842                 jffs2_sum_disable_collecting(c->summary);
 843
 844                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
 845                 spin_lock(&c->erase_completion_lock);
 846                 return 0;
 847         }
 848
 849         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
 850         spin_lock(&c->erase_completion_lock);
 851         return ret;
 852 }