git.oblomov.eu Git - linux-2.6/blob - fs/jffs2/summary.c

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright © 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  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/slab.h>
  16 #include <linux/mtd/mtd.h>
  17 #include <linux/pagemap.h>
  18 #include <linux/crc32.h>
  19 #include <linux/compiler.h>
  20 #include <linux/vmalloc.h>
  21 #include "nodelist.h"
  22 #include "debug.h"
  23
  24 int jffs2_sum_init(struct jffs2_sb_info *c)
  25 {
  26         c->summary = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
  27
  28         if (!c->summary) {
  29                 JFFS2_WARNING("Can't allocate memory for summary information!\n");
  30                 return -ENOMEM;
  31         }
  32
  33         c->summary->sum_buf = vmalloc(c->sector_size);
  34
  35         if (!c->summary->sum_buf) {
  36                 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
  37                 kfree(c->summary);
  38                 return -ENOMEM;
  39         }
  40
  41         dbg_summary("returned successfully\n");
  42
  43         return 0;
  44 }
  45
  46 void jffs2_sum_exit(struct jffs2_sb_info *c)
  47 {
  48         dbg_summary("called\n");
  49
  50         jffs2_sum_disable_collecting(c->summary);
  51
  52         vfree(c->summary->sum_buf);
  53         c->summary->sum_buf = NULL;
  54
  55         kfree(c->summary);
  56         c->summary = NULL;
  57 }
  58
  59 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
  60 {
  61         if (!s->sum_list_head)
  62                 s->sum_list_head = (union jffs2_sum_mem *) item;
  63         if (s->sum_list_tail)
  64                 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
  65         s->sum_list_tail = (union jffs2_sum_mem *) item;
  66
  67         switch (je16_to_cpu(item->u.nodetype)) {
  68                 case JFFS2_NODETYPE_INODE:
  69                         s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
  70                         s->sum_num++;
  71                         dbg_summary("inode (%u) added to summary\n",
  72                                                 je32_to_cpu(item->i.inode));
  73                         break;
  74                 case JFFS2_NODETYPE_DIRENT:
  75                         s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
  76                         s->sum_num++;
  77                         dbg_summary("dirent (%u) added to summary\n",
  78                                                 je32_to_cpu(item->d.ino));
  79                         break;
  80 #ifdef CONFIG_JFFS2_FS_XATTR
  81                 case JFFS2_NODETYPE_XATTR:
  82                         s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
  83                         s->sum_num++;
  84                         dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
  85                                     je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
  86                         break;
  87                 case JFFS2_NODETYPE_XREF:
  88                         s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
  89                         s->sum_num++;
  90                         dbg_summary("xref added to summary\n");
  91                         break;
  92 #endif
  93                 default:
  94                         JFFS2_WARNING("UNKNOWN node type %u\n",
  95                                             je16_to_cpu(item->u.nodetype));
  96                         return 1;
  97         }
  98         return 0;
  99 }
 100
 101
 102 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
 103
 104 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
 105 {
 106         dbg_summary("called with %u\n", size);
 107         s->sum_padded += size;
 108         return 0;
 109 }
 110
 111 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
 112                                 uint32_t ofs)
 113 {
 114         struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
 115
 116         if (!temp)
 117                 return -ENOMEM;
 118
 119         temp->nodetype = ri->nodetype;
 120         temp->inode = ri->ino;
 121         temp->version = ri->version;
 122         temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */
 123         temp->totlen = ri->totlen;
 124         temp->next = NULL;
 125
 126         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 127 }
 128
 129 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
 130                                 uint32_t ofs)
 131 {
 132         struct jffs2_sum_dirent_mem *temp =
 133                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
 134
 135         if (!temp)
 136                 return -ENOMEM;
 137
 138         temp->nodetype = rd->nodetype;
 139         temp->totlen = rd->totlen;
 140         temp->offset = cpu_to_je32(ofs);        /* relative from the begining of the jeb */
 141         temp->pino = rd->pino;
 142         temp->version = rd->version;
 143         temp->ino = rd->ino;
 144         temp->nsize = rd->nsize;
 145         temp->type = rd->type;
 146         temp->next = NULL;
 147
 148         memcpy(temp->name, rd->name, rd->nsize);
 149
 150         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 151 }
 152
 153 #ifdef CONFIG_JFFS2_FS_XATTR
 154 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
 155 {
 156         struct jffs2_sum_xattr_mem *temp;
 157
 158         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
 159         if (!temp)
 160                 return -ENOMEM;
 161
 162         temp->nodetype = rx->nodetype;
 163         temp->xid = rx->xid;
 164         temp->version = rx->version;
 165         temp->offset = cpu_to_je32(ofs);
 166         temp->totlen = rx->totlen;
 167         temp->next = NULL;
 168
 169         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 170 }
 171
 172 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
 173 {
 174         struct jffs2_sum_xref_mem *temp;
 175
 176         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
 177         if (!temp)
 178                 return -ENOMEM;
 179
 180         temp->nodetype = rr->nodetype;
 181         temp->offset = cpu_to_je32(ofs);
 182         temp->next = NULL;
 183
 184         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 185 }
 186 #endif
 187 /* Cleanup every collected summary information */
 188
 189 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
 190 {
 191         union jffs2_sum_mem *temp;
 192
 193         if (!s->sum_list_head) {
 194                 dbg_summary("already empty\n");
 195         }
 196         while (s->sum_list_head) {
 197                 temp = s->sum_list_head;
 198                 s->sum_list_head = s->sum_list_head->u.next;
 199                 kfree(temp);
 200         }
 201         s->sum_list_tail = NULL;
 202         s->sum_padded = 0;
 203         s->sum_num = 0;
 204 }
 205
 206 void jffs2_sum_reset_collected(struct jffs2_summary *s)
 207 {
 208         dbg_summary("called\n");
 209         jffs2_sum_clean_collected(s);
 210         s->sum_size = 0;
 211 }
 212
 213 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
 214 {
 215         dbg_summary("called\n");
 216         jffs2_sum_clean_collected(s);
 217         s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 218 }
 219
 220 int jffs2_sum_is_disabled(struct jffs2_summary *s)
 221 {
 222         return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
 223 }
 224
 225 /* Move the collected summary information into sb (called from scan.c) */
 226
 227 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
 228 {
 229         dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
 230                                 c->summary->sum_size, c->summary->sum_num,
 231                                 s->sum_size, s->sum_num);
 232
 233         c->summary->sum_size = s->sum_size;
 234         c->summary->sum_num = s->sum_num;
 235         c->summary->sum_padded = s->sum_padded;
 236         c->summary->sum_list_head = s->sum_list_head;
 237         c->summary->sum_list_tail = s->sum_list_tail;
 238
 239         s->sum_list_head = s->sum_list_tail = NULL;
 240 }
 241
 242 /* Called from wbuf.c to collect writed node info */
 243
 244 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
 245                                 unsigned long count, uint32_t ofs)
 246 {
 247         union jffs2_node_union *node;
 248         struct jffs2_eraseblock *jeb;
 249
 250         if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) {
 251                 dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n");
 252                 return 0;
 253         }
 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                         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
 314                         if (!temp)
 315                                 goto no_mem;
 316
 317                         temp->nodetype = node->x.nodetype;
 318                         temp->xid = node->x.xid;
 319                         temp->version = node->x.version;
 320                         temp->totlen = node->x.totlen;
 321                         temp->offset = cpu_to_je32(ofs);
 322                         temp->next = NULL;
 323
 324                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 325                 }
 326                 case JFFS2_NODETYPE_XREF: {
 327                         struct jffs2_sum_xref_mem *temp;
 328                         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
 329                         if (!temp)
 330                                 goto no_mem;
 331                         temp->nodetype = node->r.nodetype;
 332                         temp->offset = cpu_to_je32(ofs);
 333                         temp->next = NULL;
 334
 335                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 336                 }
 337 #endif
 338                 case JFFS2_NODETYPE_PADDING:
 339                         dbg_summary("node PADDING\n");
 340                         c->summary->sum_padded += je32_to_cpu(node->u.totlen);
 341                         break;
 342
 343                 case JFFS2_NODETYPE_CLEANMARKER:
 344                         dbg_summary("node CLEANMARKER\n");
 345                         break;
 346
 347                 case JFFS2_NODETYPE_SUMMARY:
 348                         dbg_summary("node SUMMARY\n");
 349                         break;
 350
 351                 default:
 352                         /* If you implement a new node type you should also implement
 353                            summary support for it or disable summary.
 354                         */
 355                         BUG();
 356                         break;
 357         }
 358
 359         return 0;
 360
 361 no_mem:
 362         JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
 363         return -ENOMEM;
 364 }
 365
 366 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
 367                                                     struct jffs2_eraseblock *jeb,
 368                                                     uint32_t ofs, uint32_t len,
 369                                                     struct jffs2_inode_cache *ic)
 370 {
 371         /* If there was a gap, mark it dirty */
 372         if ((ofs & ~3) > c->sector_size - jeb->free_size) {
 373                 /* Ew. Summary doesn't actually tell us explicitly about dirty space */
 374                 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
 375         }
 376
 377         return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
 378 }
 379
 380 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
 381
 382 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 383                                 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
 384 {
 385         struct jffs2_inode_cache *ic;
 386         struct jffs2_full_dirent *fd;
 387         void *sp;
 388         int i, ino;
 389         int err;
 390
 391         sp = summary->sum;
 392
 393         for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
 394                 dbg_summary("processing summary index %d\n", i);
 395
 396                 cond_resched();
 397
 398                 /* Make sure there's a spare ref for dirty space */
 399                 err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
 400                 if (err)
 401                         return err;
 402
 403                 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
 404                         case JFFS2_NODETYPE_INODE: {
 405                                 struct jffs2_sum_inode_flash *spi;
 406                                 spi = sp;
 407
 408                                 ino = je32_to_cpu(spi->inode);
 409
 410                                 dbg_summary("Inode at 0x%08x-0x%08x\n",
 411                                             jeb->offset + je32_to_cpu(spi->offset),
 412                                             jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
 413
 414                                 ic = jffs2_scan_make_ino_cache(c, ino);
 415                                 if (!ic) {
 416                                         JFFS2_NOTICE("scan_make_ino_cache failed\n");
 417                                         return -ENOMEM;
 418                                 }
 419
 420                                 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
 421                                                   PAD(je32_to_cpu(spi->totlen)), ic);
 422
 423                                 *pseudo_random += je32_to_cpu(spi->version);
 424
 425                                 sp += JFFS2_SUMMARY_INODE_SIZE;
 426
 427                                 break;
 428                         }
 429
 430                         case JFFS2_NODETYPE_DIRENT: {
 431                                 struct jffs2_sum_dirent_flash *spd;
 432                                 int checkedlen;
 433                                 spd = sp;
 434
 435                                 dbg_summary("Dirent at 0x%08x-0x%08x\n",
 436                                             jeb->offset + je32_to_cpu(spd->offset),
 437                                             jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
 438
 439
 440                                 /* This should never happen, but https://dev.laptop.org/ticket/4184 */
 441                                 checkedlen = strnlen(spd->name, spd->nsize);
 442                                 if (!checkedlen) {
 443                                         printk(KERN_ERR "Dirent at %08x has zero at start of name. Aborting mount.\n",
 444                                                jeb->offset + je32_to_cpu(spd->offset));
 445                                         return -EIO;
 446                                 }
 447                                 if (checkedlen < spd->nsize) {
 448                                         printk(KERN_ERR "Dirent at %08x has zeroes in name. Truncating to %d chars\n",
 449                                                jeb->offset + je32_to_cpu(spd->offset), checkedlen);
 450                                 }
 451
 452
 453                                 fd = jffs2_alloc_full_dirent(checkedlen+1);
 454                                 if (!fd)
 455                                         return -ENOMEM;
 456
 457                                 memcpy(&fd->name, spd->name, checkedlen);
 458                                 fd->name[checkedlen] = 0;
 459
 460                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
 461                                 if (!ic) {
 462                                         jffs2_free_full_dirent(fd);
 463                                         return -ENOMEM;
 464                                 }
 465
 466                                 fd->raw = sum_link_node_ref(c, jeb,  je32_to_cpu(spd->offset) | REF_UNCHECKED,
 467                                                             PAD(je32_to_cpu(spd->totlen)), ic);
 468
 469                                 fd->next = NULL;
 470                                 fd->version = je32_to_cpu(spd->version);
 471                                 fd->ino = je32_to_cpu(spd->ino);
 472                                 fd->nhash = full_name_hash(fd->name, checkedlen);
 473                                 fd->type = spd->type;
 474
 475                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
 476
 477                                 *pseudo_random += je32_to_cpu(spd->version);
 478
 479                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
 480
 481                                 break;
 482                         }
 483 #ifdef CONFIG_JFFS2_FS_XATTR
 484                         case JFFS2_NODETYPE_XATTR: {
 485                                 struct jffs2_xattr_datum *xd;
 486                                 struct jffs2_sum_xattr_flash *spx;
 487
 488                                 spx = (struct jffs2_sum_xattr_flash *)sp;
 489                                 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n",
 490                                             jeb->offset + je32_to_cpu(spx->offset),
 491                                             jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
 492                                             je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
 493
 494                                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
 495                                                                 je32_to_cpu(spx->version));
 496                                 if (IS_ERR(xd))
 497                                         return PTR_ERR(xd);
 498                                 if (xd->version > je32_to_cpu(spx->version)) {
 499                                         /* node is not the newest one */
 500                                         struct jffs2_raw_node_ref *raw
 501                                                 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
 502                                                                     PAD(je32_to_cpu(spx->totlen)), NULL);
 503                                         raw->next_in_ino = xd->node->next_in_ino;
 504                                         xd->node->next_in_ino = raw;
 505                                 } else {
 506                                         xd->version = je32_to_cpu(spx->version);
 507                                         sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
 508                                                           PAD(je32_to_cpu(spx->totlen)), (void *)xd);
 509                                 }
 510                                 *pseudo_random += je32_to_cpu(spx->xid);
 511                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
 512
 513                                 break;
 514                         }
 515                         case JFFS2_NODETYPE_XREF: {
 516                                 struct jffs2_xattr_ref *ref;
 517                                 struct jffs2_sum_xref_flash *spr;
 518
 519                                 spr = (struct jffs2_sum_xref_flash *)sp;
 520                                 dbg_summary("xref at %#08x-%#08x\n",
 521                                             jeb->offset + je32_to_cpu(spr->offset),
 522                                             jeb->offset + je32_to_cpu(spr->offset) +
 523                                             (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
 524
 525                                 ref = jffs2_alloc_xattr_ref();
 526                                 if (!ref) {
 527                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
 528                                         return -ENOMEM;
 529                                 }
 530                                 ref->next = c->xref_temp;
 531                                 c->xref_temp = ref;
 532
 533                                 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
 534                                                   PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
 535
 536                                 *pseudo_random += ref->node->flash_offset;
 537                                 sp += JFFS2_SUMMARY_XREF_SIZE;
 538
 539                                 break;
 540                         }
 541 #endif
 542                         default : {
 543                                 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
 544                                 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
 545                                 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
 546                                         return -EIO;
 547
 548                                 /* For compatible node types, just fall back to the full scan */
 549                                 c->wasted_size -= jeb->wasted_size;
 550                                 c->free_size += c->sector_size - jeb->free_size;
 551                                 c->used_size -= jeb->used_size;
 552                                 c->dirty_size -= jeb->dirty_size;
 553                                 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
 554                                 jeb->free_size = c->sector_size;
 555
 556                                 jffs2_free_jeb_node_refs(c, jeb);
 557                                 return -ENOTRECOVERABLE;
 558                         }
 559                 }
 560         }
 561         return 0;
 562 }
 563
 564 /* Process the summary node - called from jffs2_scan_eraseblock() */
 565 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 566                            struct jffs2_raw_summary *summary, uint32_t sumsize,
 567                            uint32_t *pseudo_random)
 568 {
 569         struct jffs2_unknown_node crcnode;
 570         int ret, ofs;
 571         uint32_t crc;
 572
 573         ofs = c->sector_size - sumsize;
 574
 575         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
 576                     jeb->offset, jeb->offset + ofs, sumsize);
 577
 578         /* OK, now check for node validity and CRC */
 579         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 580         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 581         crcnode.totlen = summary->totlen;
 582         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
 583
 584         if (je32_to_cpu(summary->hdr_crc) != crc) {
 585                 dbg_summary("Summary node header is corrupt (bad CRC or "
 586                                 "no summary at all)\n");
 587                 goto crc_err;
 588         }
 589
 590         if (je32_to_cpu(summary->totlen) != sumsize) {
 591                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
 592                 goto crc_err;
 593         }
 594
 595         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
 596
 597         if (je32_to_cpu(summary->node_crc) != crc) {
 598                 dbg_summary("Summary node is corrupt (bad CRC)\n");
 599                 goto crc_err;
 600         }
 601
 602         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
 603
 604         if (je32_to_cpu(summary->sum_crc) != crc) {
 605                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
 606                 goto crc_err;
 607         }
 608
 609         if ( je32_to_cpu(summary->cln_mkr) ) {
 610
 611                 dbg_summary("Summary : CLEANMARKER node \n");
 612
 613                 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
 614                 if (ret)
 615                         return ret;
 616
 617                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
 618                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
 619                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
 620                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
 621                                 return ret;
 622                 } else if (jeb->first_node) {
 623                         dbg_summary("CLEANMARKER node not first node in block "
 624                                         "(0x%08x)\n", jeb->offset);
 625                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
 626                                 return ret;
 627                 } else {
 628                         jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
 629                                             je32_to_cpu(summary->cln_mkr), NULL);
 630                 }
 631         }
 632
 633         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
 634         /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
 635            scan of this eraseblock. So return zero */
 636         if (ret == -ENOTRECOVERABLE)
 637                 return 0;
 638         if (ret)
 639                 return ret;             /* real error */
 640
 641         /* for PARANOIA_CHECK */
 642         ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
 643         if (ret)
 644                 return ret;
 645
 646         sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
 647
 648         if (unlikely(jeb->free_size)) {
 649                 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
 650                               jeb->free_size, jeb->offset);
 651                 jeb->wasted_size += jeb->free_size;
 652                 c->wasted_size += jeb->free_size;
 653                 c->free_size -= jeb->free_size;
 654                 jeb->free_size = 0;
 655         }
 656
 657         return jffs2_scan_classify_jeb(c, jeb);
 658
 659 crc_err:
 660         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
 661
 662         return 0;
 663 }
 664
 665 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
 666
 667 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 668                                         uint32_t infosize, uint32_t datasize, int padsize)
 669 {
 670         struct jffs2_raw_summary isum;
 671         union jffs2_sum_mem *temp;
 672         struct jffs2_sum_marker *sm;
 673         struct kvec vecs[2];
 674         uint32_t sum_ofs;
 675         void *wpage;
 676         int ret;
 677         size_t retlen;
 678
 679         memset(c->summary->sum_buf, 0xff, datasize);
 680         memset(&isum, 0, sizeof(isum));
 681
 682         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 683         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 684         isum.totlen = cpu_to_je32(infosize);
 685         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
 686         isum.padded = cpu_to_je32(c->summary->sum_padded);
 687         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
 688         isum.sum_num = cpu_to_je32(c->summary->sum_num);
 689         wpage = c->summary->sum_buf;
 690
 691         while (c->summary->sum_num) {
 692                 temp = c->summary->sum_list_head;
 693
 694                 switch (je16_to_cpu(temp->u.nodetype)) {
 695                         case JFFS2_NODETYPE_INODE: {
 696                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
 697
 698                                 sino_ptr->nodetype = temp->i.nodetype;
 699                                 sino_ptr->inode = temp->i.inode;
 700                                 sino_ptr->version = temp->i.version;
 701                                 sino_ptr->offset = temp->i.offset;
 702                                 sino_ptr->totlen = temp->i.totlen;
 703
 704                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
 705
 706                                 break;
 707                         }
 708
 709                         case JFFS2_NODETYPE_DIRENT: {
 710                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
 711
 712                                 sdrnt_ptr->nodetype = temp->d.nodetype;
 713                                 sdrnt_ptr->totlen = temp->d.totlen;
 714                                 sdrnt_ptr->offset = temp->d.offset;
 715                                 sdrnt_ptr->pino = temp->d.pino;
 716                                 sdrnt_ptr->version = temp->d.version;
 717                                 sdrnt_ptr->ino = temp->d.ino;
 718                                 sdrnt_ptr->nsize = temp->d.nsize;
 719                                 sdrnt_ptr->type = temp->d.type;
 720
 721                                 memcpy(sdrnt_ptr->name, temp->d.name,
 722                                                         temp->d.nsize);
 723
 724                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
 725
 726                                 break;
 727                         }
 728 #ifdef CONFIG_JFFS2_FS_XATTR
 729                         case JFFS2_NODETYPE_XATTR: {
 730                                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
 731
 732                                 temp = c->summary->sum_list_head;
 733                                 sxattr_ptr->nodetype = temp->x.nodetype;
 734                                 sxattr_ptr->xid = temp->x.xid;
 735                                 sxattr_ptr->version = temp->x.version;
 736                                 sxattr_ptr->offset = temp->x.offset;
 737                                 sxattr_ptr->totlen = temp->x.totlen;
 738
 739                                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
 740                                 break;
 741                         }
 742                         case JFFS2_NODETYPE_XREF: {
 743                                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
 744
 745                                 temp = c->summary->sum_list_head;
 746                                 sxref_ptr->nodetype = temp->r.nodetype;
 747                                 sxref_ptr->offset = temp->r.offset;
 748
 749                                 wpage += JFFS2_SUMMARY_XREF_SIZE;
 750                                 break;
 751                         }
 752 #endif
 753                         default : {
 754                                 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
 755                                     == JFFS2_FEATURE_RWCOMPAT_COPY) {
 756                                         dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
 757                                                     je16_to_cpu(temp->u.nodetype));
 758                                         jffs2_sum_disable_collecting(c->summary);
 759                                 } else {
 760                                         BUG();  /* unknown node in summary information */
 761                                 }
 762                         }
 763                 }
 764
 765                 c->summary->sum_list_head = temp->u.next;
 766                 kfree(temp);
 767
 768                 c->summary->sum_num--;
 769         }
 770
 771         jffs2_sum_reset_collected(c->summary);
 772
 773         wpage += padsize;
 774
 775         sm = wpage;
 776         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
 777         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
 778
 779         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
 780         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
 781
 782         vecs[0].iov_base = &isum;
 783         vecs[0].iov_len = sizeof(isum);
 784         vecs[1].iov_base = c->summary->sum_buf;
 785         vecs[1].iov_len = datasize;
 786
 787         sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
 788
 789         dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
 790                     sum_ofs);
 791
 792         ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
 793
 794         if (ret || (retlen != infosize)) {
 795
 796                 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
 797                               infosize, sum_ofs, ret, retlen);
 798
 799                 if (retlen) {
 800                         /* Waste remaining space */
 801                         spin_lock(&c->erase_completion_lock);
 802                         jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
 803                         spin_unlock(&c->erase_completion_lock);
 804                 }
 805
 806                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 807
 808                 return 0;
 809         }
 810
 811         spin_lock(&c->erase_completion_lock);
 812         jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
 813         spin_unlock(&c->erase_completion_lock);
 814
 815         return 0;
 816 }
 817
 818 /* Write out summary information - called from jffs2_do_reserve_space */
 819
 820 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
 821 {
 822         int datasize, infosize, padsize;
 823         struct jffs2_eraseblock *jeb;
 824         int ret;
 825
 826         dbg_summary("called\n");
 827
 828         spin_unlock(&c->erase_completion_lock);
 829
 830         jeb = c->nextblock;
 831         jffs2_prealloc_raw_node_refs(c, jeb, 1);
 832
 833         if (!c->summary->sum_num || !c->summary->sum_list_head) {
 834                 JFFS2_WARNING("Empty summary info!!!\n");
 835                 BUG();
 836         }
 837
 838         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
 839         infosize = sizeof(struct jffs2_raw_summary) + datasize;
 840         padsize = jeb->free_size - infosize;
 841         infosize += padsize;
 842         datasize += padsize;
 843
 844         /* Is there enough space for summary? */
 845         if (padsize < 0) {
 846                 /* don't try to write out summary for this jeb */
 847                 jffs2_sum_disable_collecting(c->summary);
 848
 849                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
 850                 spin_lock(&c->erase_completion_lock);
 851                 return 0;
 852         }
 853
 854         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
 855         spin_lock(&c->erase_completion_lock);
 856         return ret;
 857 }