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/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 = kzalloc(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         c->summary->sum_buf = vmalloc(c->sector_size);
  36
  37         if (!c->summary->sum_buf) {
  38                 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
  39                 kfree(c->summary);
  40                 return -ENOMEM;
  41         }
  42
  43         dbg_summary("returned successfully\n");
  44
  45         return 0;
  46 }
  47
  48 void jffs2_sum_exit(struct jffs2_sb_info *c)
  49 {
  50         dbg_summary("called\n");
  51
  52         jffs2_sum_disable_collecting(c->summary);
  53
  54         vfree(c->summary->sum_buf);
  55         c->summary->sum_buf = NULL;
  56
  57         kfree(c->summary);
  58         c->summary = NULL;
  59 }
  60
  61 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
  62 {
  63         if (!s->sum_list_head)
  64                 s->sum_list_head = (union jffs2_sum_mem *) item;
  65         if (s->sum_list_tail)
  66                 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
  67         s->sum_list_tail = (union jffs2_sum_mem *) item;
  68
  69         switch (je16_to_cpu(item->u.nodetype)) {
  70                 case JFFS2_NODETYPE_INODE:
  71                         s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
  72                         s->sum_num++;
  73                         dbg_summary("inode (%u) added to summary\n",
  74                                                 je32_to_cpu(item->i.inode));
  75                         break;
  76                 case JFFS2_NODETYPE_DIRENT:
  77                         s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
  78                         s->sum_num++;
  79                         dbg_summary("dirent (%u) added to summary\n",
  80                                                 je32_to_cpu(item->d.ino));
  81                         break;
  82 #ifdef CONFIG_JFFS2_FS_XATTR
  83                 case JFFS2_NODETYPE_XATTR:
  84                         s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
  85                         s->sum_num++;
  86                         dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
  87                                     je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
  88                         break;
  89                 case JFFS2_NODETYPE_XREF:
  90                         s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
  91                         s->sum_num++;
  92                         dbg_summary("xref added to summary\n");
  93                         break;
  94 #endif
  95                 default:
  96                         JFFS2_WARNING("UNKNOWN node type %u\n",
  97                                             je16_to_cpu(item->u.nodetype));
  98                         return 1;
  99         }
 100         return 0;
 101 }
 102
 103
 104 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
 105
 106 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
 107 {
 108         dbg_summary("called with %u\n", size);
 109         s->sum_padded += size;
 110         return 0;
 111 }
 112
 113 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
 114                                 uint32_t ofs)
 115 {
 116         struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
 117
 118         if (!temp)
 119                 return -ENOMEM;
 120
 121         temp->nodetype = ri->nodetype;
 122         temp->inode = ri->ino;
 123         temp->version = ri->version;
 124         temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */
 125         temp->totlen = ri->totlen;
 126         temp->next = NULL;
 127
 128         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 129 }
 130
 131 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
 132                                 uint32_t ofs)
 133 {
 134         struct jffs2_sum_dirent_mem *temp =
 135                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
 136
 137         if (!temp)
 138                 return -ENOMEM;
 139
 140         temp->nodetype = rd->nodetype;
 141         temp->totlen = rd->totlen;
 142         temp->offset = cpu_to_je32(ofs);        /* relative from the begining of the jeb */
 143         temp->pino = rd->pino;
 144         temp->version = rd->version;
 145         temp->ino = rd->ino;
 146         temp->nsize = rd->nsize;
 147         temp->type = rd->type;
 148         temp->next = NULL;
 149
 150         memcpy(temp->name, rd->name, rd->nsize);
 151
 152         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 153 }
 154
 155 #ifdef CONFIG_JFFS2_FS_XATTR
 156 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
 157 {
 158         struct jffs2_sum_xattr_mem *temp;
 159
 160         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
 161         if (!temp)
 162                 return -ENOMEM;
 163
 164         temp->nodetype = rx->nodetype;
 165         temp->xid = rx->xid;
 166         temp->version = rx->version;
 167         temp->offset = cpu_to_je32(ofs);
 168         temp->totlen = rx->totlen;
 169         temp->next = NULL;
 170
 171         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 172 }
 173
 174 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
 175 {
 176         struct jffs2_sum_xref_mem *temp;
 177
 178         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
 179         if (!temp)
 180                 return -ENOMEM;
 181
 182         temp->nodetype = rr->nodetype;
 183         temp->offset = cpu_to_je32(ofs);
 184         temp->next = NULL;
 185
 186         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 187 }
 188 #endif
 189 /* Cleanup every collected summary information */
 190
 191 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
 192 {
 193         union jffs2_sum_mem *temp;
 194
 195         if (!s->sum_list_head) {
 196                 dbg_summary("already empty\n");
 197         }
 198         while (s->sum_list_head) {
 199                 temp = s->sum_list_head;
 200                 s->sum_list_head = s->sum_list_head->u.next;
 201                 kfree(temp);
 202         }
 203         s->sum_list_tail = NULL;
 204         s->sum_padded = 0;
 205         s->sum_num = 0;
 206 }
 207
 208 void jffs2_sum_reset_collected(struct jffs2_summary *s)
 209 {
 210         dbg_summary("called\n");
 211         jffs2_sum_clean_collected(s);
 212         s->sum_size = 0;
 213 }
 214
 215 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
 216 {
 217         dbg_summary("called\n");
 218         jffs2_sum_clean_collected(s);
 219         s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 220 }
 221
 222 int jffs2_sum_is_disabled(struct jffs2_summary *s)
 223 {
 224         return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
 225 }
 226
 227 /* Move the collected summary information into sb (called from scan.c) */
 228
 229 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
 230 {
 231         dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
 232                                 c->summary->sum_size, c->summary->sum_num,
 233                                 s->sum_size, s->sum_num);
 234
 235         c->summary->sum_size = s->sum_size;
 236         c->summary->sum_num = s->sum_num;
 237         c->summary->sum_padded = s->sum_padded;
 238         c->summary->sum_list_head = s->sum_list_head;
 239         c->summary->sum_list_tail = s->sum_list_tail;
 240
 241         s->sum_list_head = s->sum_list_tail = NULL;
 242 }
 243
 244 /* Called from wbuf.c to collect writed node info */
 245
 246 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
 247                                 unsigned long count, uint32_t ofs)
 248 {
 249         union jffs2_node_union *node;
 250         struct jffs2_eraseblock *jeb;
 251
 252         if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) {
 253                 dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n");
 254                 return 0;
 255         }
 256
 257         node = invecs[0].iov_base;
 258         jeb = &c->blocks[ofs / c->sector_size];
 259         ofs -= jeb->offset;
 260
 261         switch (je16_to_cpu(node->u.nodetype)) {
 262                 case JFFS2_NODETYPE_INODE: {
 263                         struct jffs2_sum_inode_mem *temp =
 264                                 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
 265
 266                         if (!temp)
 267                                 goto no_mem;
 268
 269                         temp->nodetype = node->i.nodetype;
 270                         temp->inode = node->i.ino;
 271                         temp->version = node->i.version;
 272                         temp->offset = cpu_to_je32(ofs);
 273                         temp->totlen = node->i.totlen;
 274                         temp->next = NULL;
 275
 276                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 277                 }
 278
 279                 case JFFS2_NODETYPE_DIRENT: {
 280                         struct jffs2_sum_dirent_mem *temp =
 281                                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
 282
 283                         if (!temp)
 284                                 goto no_mem;
 285
 286                         temp->nodetype = node->d.nodetype;
 287                         temp->totlen = node->d.totlen;
 288                         temp->offset = cpu_to_je32(ofs);
 289                         temp->pino = node->d.pino;
 290                         temp->version = node->d.version;
 291                         temp->ino = node->d.ino;
 292                         temp->nsize = node->d.nsize;
 293                         temp->type = node->d.type;
 294                         temp->next = NULL;
 295
 296                         switch (count) {
 297                                 case 1:
 298                                         memcpy(temp->name,node->d.name,node->d.nsize);
 299                                         break;
 300
 301                                 case 2:
 302                                         memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
 303                                         break;
 304
 305                                 default:
 306                                         BUG();  /* impossible count value */
 307                                         break;
 308                         }
 309
 310                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 311                 }
 312 #ifdef CONFIG_JFFS2_FS_XATTR
 313                 case JFFS2_NODETYPE_XATTR: {
 314                         struct jffs2_sum_xattr_mem *temp;
 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                         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
 331                         if (!temp)
 332                                 goto no_mem;
 333                         temp->nodetype = node->r.nodetype;
 334                         temp->offset = cpu_to_je32(ofs);
 335                         temp->next = NULL;
 336
 337                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 338                 }
 339 #endif
 340                 case JFFS2_NODETYPE_PADDING:
 341                         dbg_summary("node PADDING\n");
 342                         c->summary->sum_padded += je32_to_cpu(node->u.totlen);
 343                         break;
 344
 345                 case JFFS2_NODETYPE_CLEANMARKER:
 346                         dbg_summary("node CLEANMARKER\n");
 347                         break;
 348
 349                 case JFFS2_NODETYPE_SUMMARY:
 350                         dbg_summary("node SUMMARY\n");
 351                         break;
 352
 353                 default:
 354                         /* If you implement a new node type you should also implement
 355                            summary support for it or disable summary.
 356                         */
 357                         BUG();
 358                         break;
 359         }
 360
 361         return 0;
 362
 363 no_mem:
 364         JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
 365         return -ENOMEM;
 366 }
 367
 368 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
 369                                                     struct jffs2_eraseblock *jeb,
 370                                                     uint32_t ofs, uint32_t len,
 371                                                     struct jffs2_inode_cache *ic)
 372 {
 373         /* If there was a gap, mark it dirty */
 374         if ((ofs & ~3) > c->sector_size - jeb->free_size) {
 375                 /* Ew. Summary doesn't actually tell us explicitly about dirty space */
 376                 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
 377         }
 378
 379         return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
 380 }
 381
 382 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
 383
 384 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 385                                 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
 386 {
 387         struct jffs2_inode_cache *ic;
 388         struct jffs2_full_dirent *fd;
 389         void *sp;
 390         int i, ino;
 391         int err;
 392
 393         sp = summary->sum;
 394
 395         for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
 396                 dbg_summary("processing summary index %d\n", i);
 397
 398                 cond_resched();
 399
 400                 /* Make sure there's a spare ref for dirty space */
 401                 err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
 402                 if (err)
 403                         return err;
 404
 405                 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
 406                         case JFFS2_NODETYPE_INODE: {
 407                                 struct jffs2_sum_inode_flash *spi;
 408                                 spi = sp;
 409
 410                                 ino = je32_to_cpu(spi->inode);
 411
 412                                 dbg_summary("Inode at 0x%08x-0x%08x\n",
 413                                             jeb->offset + je32_to_cpu(spi->offset),
 414                                             jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
 415
 416                                 ic = jffs2_scan_make_ino_cache(c, ino);
 417                                 if (!ic) {
 418                                         JFFS2_NOTICE("scan_make_ino_cache failed\n");
 419                                         return -ENOMEM;
 420                                 }
 421
 422                                 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
 423                                                   PAD(je32_to_cpu(spi->totlen)), ic);
 424
 425                                 *pseudo_random += je32_to_cpu(spi->version);
 426
 427                                 sp += JFFS2_SUMMARY_INODE_SIZE;
 428
 429                                 break;
 430                         }
 431
 432                         case JFFS2_NODETYPE_DIRENT: {
 433                                 struct jffs2_sum_dirent_flash *spd;
 434                                 spd = sp;
 435
 436                                 dbg_summary("Dirent at 0x%08x-0x%08x\n",
 437                                             jeb->offset + je32_to_cpu(spd->offset),
 438                                             jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
 439
 440
 441                                 fd = jffs2_alloc_full_dirent(spd->nsize+1);
 442                                 if (!fd)
 443                                         return -ENOMEM;
 444
 445                                 memcpy(&fd->name, spd->name, spd->nsize);
 446                                 fd->name[spd->nsize] = 0;
 447
 448                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
 449                                 if (!ic) {
 450                                         jffs2_free_full_dirent(fd);
 451                                         return -ENOMEM;
 452                                 }
 453
 454                                 fd->raw = sum_link_node_ref(c, jeb,  je32_to_cpu(spd->offset) | REF_UNCHECKED,
 455                                                             PAD(je32_to_cpu(spd->totlen)), ic);
 456
 457                                 fd->next = NULL;
 458                                 fd->version = je32_to_cpu(spd->version);
 459                                 fd->ino = je32_to_cpu(spd->ino);
 460                                 fd->nhash = full_name_hash(fd->name, spd->nsize);
 461                                 fd->type = spd->type;
 462
 463                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
 464
 465                                 *pseudo_random += je32_to_cpu(spd->version);
 466
 467                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
 468
 469                                 break;
 470                         }
 471 #ifdef CONFIG_JFFS2_FS_XATTR
 472                         case JFFS2_NODETYPE_XATTR: {
 473                                 struct jffs2_xattr_datum *xd;
 474                                 struct jffs2_sum_xattr_flash *spx;
 475
 476                                 spx = (struct jffs2_sum_xattr_flash *)sp;
 477                                 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n",
 478                                             jeb->offset + je32_to_cpu(spx->offset),
 479                                             jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
 480                                             je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
 481
 482                                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
 483                                                                 je32_to_cpu(spx->version));
 484                                 if (IS_ERR(xd))
 485                                         return PTR_ERR(xd);
 486                                 if (xd->version > je32_to_cpu(spx->version)) {
 487                                         /* node is not the newest one */
 488                                         struct jffs2_raw_node_ref *raw
 489                                                 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
 490                                                                     PAD(je32_to_cpu(spx->totlen)), NULL);
 491                                         raw->next_in_ino = xd->node->next_in_ino;
 492                                         xd->node->next_in_ino = raw;
 493                                 } else {
 494                                         xd->version = je32_to_cpu(spx->version);
 495                                         sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
 496                                                           PAD(je32_to_cpu(spx->totlen)), (void *)xd);
 497                                 }
 498                                 *pseudo_random += je32_to_cpu(spx->xid);
 499                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
 500
 501                                 break;
 502                         }
 503                         case JFFS2_NODETYPE_XREF: {
 504                                 struct jffs2_xattr_ref *ref;
 505                                 struct jffs2_sum_xref_flash *spr;
 506
 507                                 spr = (struct jffs2_sum_xref_flash *)sp;
 508                                 dbg_summary("xref at %#08x-%#08x\n",
 509                                             jeb->offset + je32_to_cpu(spr->offset),
 510                                             jeb->offset + je32_to_cpu(spr->offset) +
 511                                             (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
 512
 513                                 ref = jffs2_alloc_xattr_ref();
 514                                 if (!ref) {
 515                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
 516                                         return -ENOMEM;
 517                                 }
 518                                 ref->next = c->xref_temp;
 519                                 c->xref_temp = ref;
 520
 521                                 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
 522                                                   PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
 523
 524                                 *pseudo_random += ref->node->flash_offset;
 525                                 sp += JFFS2_SUMMARY_XREF_SIZE;
 526
 527                                 break;
 528                         }
 529 #endif
 530                         default : {
 531                                 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
 532                                 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
 533                                 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
 534                                         return -EIO;
 535
 536                                 /* For compatible node types, just fall back to the full scan */
 537                                 c->wasted_size -= jeb->wasted_size;
 538                                 c->free_size += c->sector_size - jeb->free_size;
 539                                 c->used_size -= jeb->used_size;
 540                                 c->dirty_size -= jeb->dirty_size;
 541                                 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
 542                                 jeb->free_size = c->sector_size;
 543
 544                                 jffs2_free_jeb_node_refs(c, jeb);
 545                                 return -ENOTRECOVERABLE;
 546                         }
 547                 }
 548         }
 549         return 0;
 550 }
 551
 552 /* Process the summary node - called from jffs2_scan_eraseblock() */
 553 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 554                            struct jffs2_raw_summary *summary, uint32_t sumsize,
 555                            uint32_t *pseudo_random)
 556 {
 557         struct jffs2_unknown_node crcnode;
 558         int ret, ofs;
 559         uint32_t crc;
 560
 561         ofs = c->sector_size - sumsize;
 562
 563         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
 564                     jeb->offset, jeb->offset + ofs, sumsize);
 565
 566         /* OK, now check for node validity and CRC */
 567         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 568         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 569         crcnode.totlen = summary->totlen;
 570         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
 571
 572         if (je32_to_cpu(summary->hdr_crc) != crc) {
 573                 dbg_summary("Summary node header is corrupt (bad CRC or "
 574                                 "no summary at all)\n");
 575                 goto crc_err;
 576         }
 577
 578         if (je32_to_cpu(summary->totlen) != sumsize) {
 579                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
 580                 goto crc_err;
 581         }
 582
 583         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
 584
 585         if (je32_to_cpu(summary->node_crc) != crc) {
 586                 dbg_summary("Summary node is corrupt (bad CRC)\n");
 587                 goto crc_err;
 588         }
 589
 590         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
 591
 592         if (je32_to_cpu(summary->sum_crc) != crc) {
 593                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
 594                 goto crc_err;
 595         }
 596
 597         if ( je32_to_cpu(summary->cln_mkr) ) {
 598
 599                 dbg_summary("Summary : CLEANMARKER node \n");
 600
 601                 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
 602                 if (ret)
 603                         return ret;
 604
 605                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
 606                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
 607                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
 608                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
 609                                 return ret;
 610                 } else if (jeb->first_node) {
 611                         dbg_summary("CLEANMARKER node not first node in block "
 612                                         "(0x%08x)\n", jeb->offset);
 613                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
 614                                 return ret;
 615                 } else {
 616                         jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
 617                                             je32_to_cpu(summary->cln_mkr), NULL);
 618                 }
 619         }
 620
 621         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
 622         /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
 623            scan of this eraseblock. So return zero */
 624         if (ret == -ENOTRECOVERABLE)
 625                 return 0;
 626         if (ret)
 627                 return ret;             /* real error */
 628
 629         /* for PARANOIA_CHECK */
 630         ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
 631         if (ret)
 632                 return ret;
 633
 634         sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
 635
 636         if (unlikely(jeb->free_size)) {
 637                 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
 638                               jeb->free_size, jeb->offset);
 639                 jeb->wasted_size += jeb->free_size;
 640                 c->wasted_size += jeb->free_size;
 641                 c->free_size -= jeb->free_size;
 642                 jeb->free_size = 0;
 643         }
 644
 645         return jffs2_scan_classify_jeb(c, jeb);
 646
 647 crc_err:
 648         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
 649
 650         return 0;
 651 }
 652
 653 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
 654
 655 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 656                                         uint32_t infosize, uint32_t datasize, int padsize)
 657 {
 658         struct jffs2_raw_summary isum;
 659         union jffs2_sum_mem *temp;
 660         struct jffs2_sum_marker *sm;
 661         struct kvec vecs[2];
 662         uint32_t sum_ofs;
 663         void *wpage;
 664         int ret;
 665         size_t retlen;
 666
 667         memset(c->summary->sum_buf, 0xff, datasize);
 668         memset(&isum, 0, sizeof(isum));
 669
 670         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 671         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 672         isum.totlen = cpu_to_je32(infosize);
 673         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
 674         isum.padded = cpu_to_je32(c->summary->sum_padded);
 675         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
 676         isum.sum_num = cpu_to_je32(c->summary->sum_num);
 677         wpage = c->summary->sum_buf;
 678
 679         while (c->summary->sum_num) {
 680                 temp = c->summary->sum_list_head;
 681
 682                 switch (je16_to_cpu(temp->u.nodetype)) {
 683                         case JFFS2_NODETYPE_INODE: {
 684                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
 685
 686                                 sino_ptr->nodetype = temp->i.nodetype;
 687                                 sino_ptr->inode = temp->i.inode;
 688                                 sino_ptr->version = temp->i.version;
 689                                 sino_ptr->offset = temp->i.offset;
 690                                 sino_ptr->totlen = temp->i.totlen;
 691
 692                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
 693
 694                                 break;
 695                         }
 696
 697                         case JFFS2_NODETYPE_DIRENT: {
 698                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
 699
 700                                 sdrnt_ptr->nodetype = temp->d.nodetype;
 701                                 sdrnt_ptr->totlen = temp->d.totlen;
 702                                 sdrnt_ptr->offset = temp->d.offset;
 703                                 sdrnt_ptr->pino = temp->d.pino;
 704                                 sdrnt_ptr->version = temp->d.version;
 705                                 sdrnt_ptr->ino = temp->d.ino;
 706                                 sdrnt_ptr->nsize = temp->d.nsize;
 707                                 sdrnt_ptr->type = temp->d.type;
 708
 709                                 memcpy(sdrnt_ptr->name, temp->d.name,
 710                                                         temp->d.nsize);
 711
 712                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
 713
 714                                 break;
 715                         }
 716 #ifdef CONFIG_JFFS2_FS_XATTR
 717                         case JFFS2_NODETYPE_XATTR: {
 718                                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
 719
 720                                 temp = c->summary->sum_list_head;
 721                                 sxattr_ptr->nodetype = temp->x.nodetype;
 722                                 sxattr_ptr->xid = temp->x.xid;
 723                                 sxattr_ptr->version = temp->x.version;
 724                                 sxattr_ptr->offset = temp->x.offset;
 725                                 sxattr_ptr->totlen = temp->x.totlen;
 726
 727                                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
 728                                 break;
 729                         }
 730                         case JFFS2_NODETYPE_XREF: {
 731                                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
 732
 733                                 temp = c->summary->sum_list_head;
 734                                 sxref_ptr->nodetype = temp->r.nodetype;
 735                                 sxref_ptr->offset = temp->r.offset;
 736
 737                                 wpage += JFFS2_SUMMARY_XREF_SIZE;
 738                                 break;
 739                         }
 740 #endif
 741                         default : {
 742                                 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
 743                                     == JFFS2_FEATURE_RWCOMPAT_COPY) {
 744                                         dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
 745                                                     je16_to_cpu(temp->u.nodetype));
 746                                         jffs2_sum_disable_collecting(c->summary);
 747                                 } else {
 748                                         BUG();  /* unknown node in summary information */
 749                                 }
 750                         }
 751                 }
 752
 753                 c->summary->sum_list_head = temp->u.next;
 754                 kfree(temp);
 755
 756                 c->summary->sum_num--;
 757         }
 758
 759         jffs2_sum_reset_collected(c->summary);
 760
 761         wpage += padsize;
 762
 763         sm = wpage;
 764         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
 765         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
 766
 767         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
 768         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
 769
 770         vecs[0].iov_base = &isum;
 771         vecs[0].iov_len = sizeof(isum);
 772         vecs[1].iov_base = c->summary->sum_buf;
 773         vecs[1].iov_len = datasize;
 774
 775         sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
 776
 777         dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
 778                     sum_ofs);
 779
 780         ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
 781
 782         if (ret || (retlen != infosize)) {
 783
 784                 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
 785                               infosize, sum_ofs, ret, retlen);
 786
 787                 if (retlen) {
 788                         /* Waste remaining space */
 789                         spin_lock(&c->erase_completion_lock);
 790                         jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
 791                         spin_unlock(&c->erase_completion_lock);
 792                 }
 793
 794                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 795
 796                 return 0;
 797         }
 798
 799         spin_lock(&c->erase_completion_lock);
 800         jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
 801         spin_unlock(&c->erase_completion_lock);
 802
 803         return 0;
 804 }
 805
 806 /* Write out summary information - called from jffs2_do_reserve_space */
 807
 808 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
 809 {
 810         int datasize, infosize, padsize;
 811         struct jffs2_eraseblock *jeb;
 812         int ret;
 813
 814         dbg_summary("called\n");
 815
 816         spin_unlock(&c->erase_completion_lock);
 817
 818         jeb = c->nextblock;
 819         jffs2_prealloc_raw_node_refs(c, jeb, 1);
 820
 821         if (!c->summary->sum_num || !c->summary->sum_list_head) {
 822                 JFFS2_WARNING("Empty summary info!!!\n");
 823                 BUG();
 824         }
 825
 826         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
 827         infosize = sizeof(struct jffs2_raw_summary) + datasize;
 828         padsize = jeb->free_size - infosize;
 829         infosize += padsize;
 830         datasize += padsize;
 831
 832         /* Is there enough space for summary? */
 833         if (padsize < 0) {
 834                 /* don't try to write out summary for this jeb */
 835                 jffs2_sum_disable_collecting(c->summary);
 836
 837                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
 838                 spin_lock(&c->erase_completion_lock);
 839                 return 0;
 840         }
 841
 842         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
 843         spin_lock(&c->erase_completion_lock);
 844         return ret;
 845 }