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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  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         uint32_t sum_size = min_t(uint32_t, c->sector_size, MAX_SUMMARY_SIZE);
  29
  30         c->summary = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
  31
  32         if (!c->summary) {
  33                 JFFS2_WARNING("Can't allocate memory for summary information!\n");
  34                 return -ENOMEM;
  35         }
  36
  37         c->summary->sum_buf = kmalloc(sum_size, GFP_KERNEL);
  38
  39         if (!c->summary->sum_buf) {
  40                 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
  41                 kfree(c->summary);
  42                 return -ENOMEM;
  43         }
  44
  45         dbg_summary("returned successfully\n");
  46
  47         return 0;
  48 }
  49
  50 void jffs2_sum_exit(struct jffs2_sb_info *c)
  51 {
  52         dbg_summary("called\n");
  53
  54         jffs2_sum_disable_collecting(c->summary);
  55
  56         kfree(c->summary->sum_buf);
  57         c->summary->sum_buf = NULL;
  58
  59         kfree(c->summary);
  60         c->summary = NULL;
  61 }
  62
  63 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
  64 {
  65         if (!s->sum_list_head)
  66                 s->sum_list_head = (union jffs2_sum_mem *) item;
  67         if (s->sum_list_tail)
  68                 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
  69         s->sum_list_tail = (union jffs2_sum_mem *) item;
  70
  71         switch (je16_to_cpu(item->u.nodetype)) {
  72                 case JFFS2_NODETYPE_INODE:
  73                         s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
  74                         s->sum_num++;
  75                         dbg_summary("inode (%u) added to summary\n",
  76                                                 je32_to_cpu(item->i.inode));
  77                         break;
  78                 case JFFS2_NODETYPE_DIRENT:
  79                         s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
  80                         s->sum_num++;
  81                         dbg_summary("dirent (%u) added to summary\n",
  82                                                 je32_to_cpu(item->d.ino));
  83                         break;
  84 #ifdef CONFIG_JFFS2_FS_XATTR
  85                 case JFFS2_NODETYPE_XATTR:
  86                         s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
  87                         s->sum_num++;
  88                         dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
  89                                     je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
  90                         break;
  91                 case JFFS2_NODETYPE_XREF:
  92                         s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
  93                         s->sum_num++;
  94                         dbg_summary("xref added to summary\n");
  95                         break;
  96 #endif
  97                 default:
  98                         JFFS2_WARNING("UNKNOWN node type %u\n",
  99                                             je16_to_cpu(item->u.nodetype));
 100                         return 1;
 101         }
 102         return 0;
 103 }
 104
 105
 106 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
 107
 108 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
 109 {
 110         dbg_summary("called with %u\n", size);
 111         s->sum_padded += size;
 112         return 0;
 113 }
 114
 115 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
 116                                 uint32_t ofs)
 117 {
 118         struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
 119
 120         if (!temp)
 121                 return -ENOMEM;
 122
 123         temp->nodetype = ri->nodetype;
 124         temp->inode = ri->ino;
 125         temp->version = ri->version;
 126         temp->offset = cpu_to_je32(ofs); /* relative offset from the beginning of the jeb */
 127         temp->totlen = ri->totlen;
 128         temp->next = NULL;
 129
 130         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 131 }
 132
 133 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
 134                                 uint32_t ofs)
 135 {
 136         struct jffs2_sum_dirent_mem *temp =
 137                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
 138
 139         if (!temp)
 140                 return -ENOMEM;
 141
 142         temp->nodetype = rd->nodetype;
 143         temp->totlen = rd->totlen;
 144         temp->offset = cpu_to_je32(ofs);        /* relative from the beginning of the jeb */
 145         temp->pino = rd->pino;
 146         temp->version = rd->version;
 147         temp->ino = rd->ino;
 148         temp->nsize = rd->nsize;
 149         temp->type = rd->type;
 150         temp->next = NULL;
 151
 152         memcpy(temp->name, rd->name, rd->nsize);
 153
 154         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 155 }
 156
 157 #ifdef CONFIG_JFFS2_FS_XATTR
 158 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
 159 {
 160         struct jffs2_sum_xattr_mem *temp;
 161
 162         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
 163         if (!temp)
 164                 return -ENOMEM;
 165
 166         temp->nodetype = rx->nodetype;
 167         temp->xid = rx->xid;
 168         temp->version = rx->version;
 169         temp->offset = cpu_to_je32(ofs);
 170         temp->totlen = rx->totlen;
 171         temp->next = NULL;
 172
 173         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 174 }
 175
 176 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
 177 {
 178         struct jffs2_sum_xref_mem *temp;
 179
 180         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
 181         if (!temp)
 182                 return -ENOMEM;
 183
 184         temp->nodetype = rr->nodetype;
 185         temp->offset = cpu_to_je32(ofs);
 186         temp->next = NULL;
 187
 188         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 189 }
 190 #endif
 191 /* Cleanup every collected summary information */
 192
 193 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
 194 {
 195         union jffs2_sum_mem *temp;
 196
 197         if (!s->sum_list_head) {
 198                 dbg_summary("already empty\n");
 199         }
 200         while (s->sum_list_head) {
 201                 temp = s->sum_list_head;
 202                 s->sum_list_head = s->sum_list_head->u.next;
 203                 kfree(temp);
 204         }
 205         s->sum_list_tail = NULL;
 206         s->sum_padded = 0;
 207         s->sum_num = 0;
 208 }
 209
 210 void jffs2_sum_reset_collected(struct jffs2_summary *s)
 211 {
 212         dbg_summary("called\n");
 213         jffs2_sum_clean_collected(s);
 214         s->sum_size = 0;
 215 }
 216
 217 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
 218 {
 219         dbg_summary("called\n");
 220         jffs2_sum_clean_collected(s);
 221         s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 222 }
 223
 224 int jffs2_sum_is_disabled(struct jffs2_summary *s)
 225 {
 226         return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
 227 }
 228
 229 /* Move the collected summary information into sb (called from scan.c) */
 230
 231 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
 232 {
 233         dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
 234                                 c->summary->sum_size, c->summary->sum_num,
 235                                 s->sum_size, s->sum_num);
 236
 237         c->summary->sum_size = s->sum_size;
 238         c->summary->sum_num = s->sum_num;
 239         c->summary->sum_padded = s->sum_padded;
 240         c->summary->sum_list_head = s->sum_list_head;
 241         c->summary->sum_list_tail = s->sum_list_tail;
 242
 243         s->sum_list_head = s->sum_list_tail = NULL;
 244 }
 245
 246 /* Called from wbuf.c to collect writed node info */
 247
 248 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
 249                                 unsigned long count, uint32_t ofs)
 250 {
 251         union jffs2_node_union *node;
 252         struct jffs2_eraseblock *jeb;
 253
 254         if (c->summary->sum_size == JFFS2_SUMMARY_NOSUM_SIZE) {
 255                 dbg_summary("Summary is disabled for this jeb! Skipping summary info!\n");
 256                 return 0;
 257         }
 258
 259         node = invecs[0].iov_base;
 260         jeb = &c->blocks[ofs / c->sector_size];
 261         ofs -= jeb->offset;
 262
 263         switch (je16_to_cpu(node->u.nodetype)) {
 264                 case JFFS2_NODETYPE_INODE: {
 265                         struct jffs2_sum_inode_mem *temp =
 266                                 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
 267
 268                         if (!temp)
 269                                 goto no_mem;
 270
 271                         temp->nodetype = node->i.nodetype;
 272                         temp->inode = node->i.ino;
 273                         temp->version = node->i.version;
 274                         temp->offset = cpu_to_je32(ofs);
 275                         temp->totlen = node->i.totlen;
 276                         temp->next = NULL;
 277
 278                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 279                 }
 280
 281                 case JFFS2_NODETYPE_DIRENT: {
 282                         struct jffs2_sum_dirent_mem *temp =
 283                                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
 284
 285                         if (!temp)
 286                                 goto no_mem;
 287
 288                         temp->nodetype = node->d.nodetype;
 289                         temp->totlen = node->d.totlen;
 290                         temp->offset = cpu_to_je32(ofs);
 291                         temp->pino = node->d.pino;
 292                         temp->version = node->d.version;
 293                         temp->ino = node->d.ino;
 294                         temp->nsize = node->d.nsize;
 295                         temp->type = node->d.type;
 296                         temp->next = NULL;
 297
 298                         switch (count) {
 299                                 case 1:
 300                                         memcpy(temp->name,node->d.name,node->d.nsize);
 301                                         break;
 302
 303                                 case 2:
 304                                         memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
 305                                         break;
 306
 307                                 default:
 308                                         BUG();  /* impossible count value */
 309                                         break;
 310                         }
 311
 312                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 313                 }
 314 #ifdef CONFIG_JFFS2_FS_XATTR
 315                 case JFFS2_NODETYPE_XATTR: {
 316                         struct jffs2_sum_xattr_mem *temp;
 317                         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
 318                         if (!temp)
 319                                 goto no_mem;
 320
 321                         temp->nodetype = node->x.nodetype;
 322                         temp->xid = node->x.xid;
 323                         temp->version = node->x.version;
 324                         temp->totlen = node->x.totlen;
 325                         temp->offset = cpu_to_je32(ofs);
 326                         temp->next = NULL;
 327
 328                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 329                 }
 330                 case JFFS2_NODETYPE_XREF: {
 331                         struct jffs2_sum_xref_mem *temp;
 332                         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
 333                         if (!temp)
 334                                 goto no_mem;
 335                         temp->nodetype = node->r.nodetype;
 336                         temp->offset = cpu_to_je32(ofs);
 337                         temp->next = NULL;
 338
 339                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 340                 }
 341 #endif
 342                 case JFFS2_NODETYPE_PADDING:
 343                         dbg_summary("node PADDING\n");
 344                         c->summary->sum_padded += je32_to_cpu(node->u.totlen);
 345                         break;
 346
 347                 case JFFS2_NODETYPE_CLEANMARKER:
 348                         dbg_summary("node CLEANMARKER\n");
 349                         break;
 350
 351                 case JFFS2_NODETYPE_SUMMARY:
 352                         dbg_summary("node SUMMARY\n");
 353                         break;
 354
 355                 default:
 356                         /* If you implement a new node type you should also implement
 357                            summary support for it or disable summary.
 358                         */
 359                         BUG();
 360                         break;
 361         }
 362
 363         return 0;
 364
 365 no_mem:
 366         JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
 367         return -ENOMEM;
 368 }
 369
 370 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
 371                                                     struct jffs2_eraseblock *jeb,
 372                                                     uint32_t ofs, uint32_t len,
 373                                                     struct jffs2_inode_cache *ic)
 374 {
 375         /* If there was a gap, mark it dirty */
 376         if ((ofs & ~3) > c->sector_size - jeb->free_size) {
 377                 /* Ew. Summary doesn't actually tell us explicitly about dirty space */
 378                 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
 379         }
 380
 381         return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
 382 }
 383
 384 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
 385
 386 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 387                                 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
 388 {
 389         struct jffs2_inode_cache *ic;
 390         struct jffs2_full_dirent *fd;
 391         void *sp;
 392         int i, ino;
 393         int err;
 394
 395         sp = summary->sum;
 396
 397         for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
 398                 dbg_summary("processing summary index %d\n", i);
 399
 400                 cond_resched();
 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                                 int checkedlen;
 437                                 spd = sp;
 438
 439                                 dbg_summary("Dirent at 0x%08x-0x%08x\n",
 440                                             jeb->offset + je32_to_cpu(spd->offset),
 441                                             jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
 442
 443
 444                                 /* This should never happen, but https://dev.laptop.org/ticket/4184 */
 445                                 checkedlen = strnlen(spd->name, spd->nsize);
 446                                 if (!checkedlen) {
 447                                         pr_err("Dirent at %08x has zero at start of name. Aborting mount.\n",
 448                                                jeb->offset +
 449                                                je32_to_cpu(spd->offset));
 450                                         return -EIO;
 451                                 }
 452                                 if (checkedlen < spd->nsize) {
 453                                         pr_err("Dirent at %08x has zeroes in name. Truncating to %d chars\n",
 454                                                jeb->offset +
 455                                                je32_to_cpu(spd->offset),
 456                                                checkedlen);
 457                                 }
 458
 459
 460                                 fd = jffs2_alloc_full_dirent(checkedlen+1);
 461                                 if (!fd)
 462                                         return -ENOMEM;
 463
 464                                 memcpy(&fd->name, spd->name, checkedlen);
 465                                 fd->name[checkedlen] = 0;
 466
 467                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
 468                                 if (!ic) {
 469                                         jffs2_free_full_dirent(fd);
 470                                         return -ENOMEM;
 471                                 }
 472
 473                                 fd->raw = sum_link_node_ref(c, jeb,  je32_to_cpu(spd->offset) | REF_UNCHECKED,
 474                                                             PAD(je32_to_cpu(spd->totlen)), ic);
 475
 476                                 fd->next = NULL;
 477                                 fd->version = je32_to_cpu(spd->version);
 478                                 fd->ino = je32_to_cpu(spd->ino);
 479                                 fd->nhash = full_name_hash(fd->name, checkedlen);
 480                                 fd->type = spd->type;
 481
 482                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
 483
 484                                 *pseudo_random += je32_to_cpu(spd->version);
 485
 486                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
 487
 488                                 break;
 489                         }
 490 #ifdef CONFIG_JFFS2_FS_XATTR
 491                         case JFFS2_NODETYPE_XATTR: {
 492                                 struct jffs2_xattr_datum *xd;
 493                                 struct jffs2_sum_xattr_flash *spx;
 494
 495                                 spx = (struct jffs2_sum_xattr_flash *)sp;
 496                                 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n",
 497                                             jeb->offset + je32_to_cpu(spx->offset),
 498                                             jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
 499                                             je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
 500
 501                                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
 502                                                                 je32_to_cpu(spx->version));
 503                                 if (IS_ERR(xd))
 504                                         return PTR_ERR(xd);
 505                                 if (xd->version > je32_to_cpu(spx->version)) {
 506                                         /* node is not the newest one */
 507                                         struct jffs2_raw_node_ref *raw
 508                                                 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
 509                                                                     PAD(je32_to_cpu(spx->totlen)), NULL);
 510                                         raw->next_in_ino = xd->node->next_in_ino;
 511                                         xd->node->next_in_ino = raw;
 512                                 } else {
 513                                         xd->version = je32_to_cpu(spx->version);
 514                                         sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
 515                                                           PAD(je32_to_cpu(spx->totlen)), (void *)xd);
 516                                 }
 517                                 *pseudo_random += je32_to_cpu(spx->xid);
 518                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
 519
 520                                 break;
 521                         }
 522                         case JFFS2_NODETYPE_XREF: {
 523                                 struct jffs2_xattr_ref *ref;
 524                                 struct jffs2_sum_xref_flash *spr;
 525
 526                                 spr = (struct jffs2_sum_xref_flash *)sp;
 527                                 dbg_summary("xref at %#08x-%#08x\n",
 528                                             jeb->offset + je32_to_cpu(spr->offset),
 529                                             jeb->offset + je32_to_cpu(spr->offset) +
 530                                             (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
 531
 532                                 ref = jffs2_alloc_xattr_ref();
 533                                 if (!ref) {
 534                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
 535                                         return -ENOMEM;
 536                                 }
 537                                 ref->next = c->xref_temp;
 538                                 c->xref_temp = ref;
 539
 540                                 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
 541                                                   PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
 542
 543                                 *pseudo_random += ref->node->flash_offset;
 544                                 sp += JFFS2_SUMMARY_XREF_SIZE;
 545
 546                                 break;
 547                         }
 548 #endif
 549                         default : {
 550                                 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
 551                                 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
 552                                 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
 553                                         return -EIO;
 554
 555                                 /* For compatible node types, just fall back to the full scan */
 556                                 c->wasted_size -= jeb->wasted_size;
 557                                 c->free_size += c->sector_size - jeb->free_size;
 558                                 c->used_size -= jeb->used_size;
 559                                 c->dirty_size -= jeb->dirty_size;
 560                                 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
 561                                 jeb->free_size = c->sector_size;
 562
 563                                 jffs2_free_jeb_node_refs(c, jeb);
 564                                 return -ENOTRECOVERABLE;
 565                         }
 566                 }
 567         }
 568         return 0;
 569 }
 570
 571 /* Process the summary node - called from jffs2_scan_eraseblock() */
 572 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 573                            struct jffs2_raw_summary *summary, uint32_t sumsize,
 574                            uint32_t *pseudo_random)
 575 {
 576         struct jffs2_unknown_node crcnode;
 577         int ret, ofs;
 578         uint32_t crc;
 579
 580         ofs = c->sector_size - sumsize;
 581
 582         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
 583                     jeb->offset, jeb->offset + ofs, sumsize);
 584
 585         /* OK, now check for node validity and CRC */
 586         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 587         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 588         crcnode.totlen = summary->totlen;
 589         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
 590
 591         if (je32_to_cpu(summary->hdr_crc) != crc) {
 592                 dbg_summary("Summary node header is corrupt (bad CRC or "
 593                                 "no summary at all)\n");
 594                 goto crc_err;
 595         }
 596
 597         if (je32_to_cpu(summary->totlen) != sumsize) {
 598                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
 599                 goto crc_err;
 600         }
 601
 602         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
 603
 604         if (je32_to_cpu(summary->node_crc) != crc) {
 605                 dbg_summary("Summary node is corrupt (bad CRC)\n");
 606                 goto crc_err;
 607         }
 608
 609         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
 610
 611         if (je32_to_cpu(summary->sum_crc) != crc) {
 612                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
 613                 goto crc_err;
 614         }
 615
 616         if ( je32_to_cpu(summary->cln_mkr) ) {
 617
 618                 dbg_summary("Summary : CLEANMARKER node \n");
 619
 620                 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
 621                 if (ret)
 622                         return ret;
 623
 624                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
 625                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
 626                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
 627                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
 628                                 return ret;
 629                 } else if (jeb->first_node) {
 630                         dbg_summary("CLEANMARKER node not first node in block "
 631                                         "(0x%08x)\n", jeb->offset);
 632                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
 633                                 return ret;
 634                 } else {
 635                         jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
 636                                             je32_to_cpu(summary->cln_mkr), NULL);
 637                 }
 638         }
 639
 640         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
 641         /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
 642            scan of this eraseblock. So return zero */
 643         if (ret == -ENOTRECOVERABLE)
 644                 return 0;
 645         if (ret)
 646                 return ret;             /* real error */
 647
 648         /* for PARANOIA_CHECK */
 649         ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
 650         if (ret)
 651                 return ret;
 652
 653         sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
 654
 655         if (unlikely(jeb->free_size)) {
 656                 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
 657                               jeb->free_size, jeb->offset);
 658                 jeb->wasted_size += jeb->free_size;
 659                 c->wasted_size += jeb->free_size;
 660                 c->free_size -= jeb->free_size;
 661                 jeb->free_size = 0;
 662         }
 663
 664         return jffs2_scan_classify_jeb(c, jeb);
 665
 666 crc_err:
 667         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
 668
 669         return 0;
 670 }
 671
 672 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
 673
 674 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 675                                 uint32_t infosize, uint32_t datasize, int padsize)
 676 {
 677         struct jffs2_raw_summary isum;
 678         union jffs2_sum_mem *temp;
 679         struct jffs2_sum_marker *sm;
 680         struct kvec vecs[2];
 681         uint32_t sum_ofs;
 682         void *wpage;
 683         int ret;
 684         size_t retlen;
 685
 686         if (padsize + datasize > MAX_SUMMARY_SIZE) {
 687                 /* It won't fit in the buffer. Abort summary for this jeb */
 688                 jffs2_sum_disable_collecting(c->summary);
 689
 690                 JFFS2_WARNING("Summary too big (%d data, %d pad) in eraseblock at %08x\n",
 691                               datasize, padsize, jeb->offset);
 692                 /* Non-fatal */
 693                 return 0;
 694         }
 695         /* Is there enough space for summary? */
 696         if (padsize < 0) {
 697                 /* don't try to write out summary for this jeb */
 698                 jffs2_sum_disable_collecting(c->summary);
 699
 700                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n",
 701                               padsize);
 702                 /* Non-fatal */
 703                 return 0;
 704         }
 705
 706         memset(c->summary->sum_buf, 0xff, datasize);
 707         memset(&isum, 0, sizeof(isum));
 708
 709         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 710         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 711         isum.totlen = cpu_to_je32(infosize);
 712         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
 713         isum.padded = cpu_to_je32(c->summary->sum_padded);
 714         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
 715         isum.sum_num = cpu_to_je32(c->summary->sum_num);
 716         wpage = c->summary->sum_buf;
 717
 718         while (c->summary->sum_num) {
 719                 temp = c->summary->sum_list_head;
 720
 721                 switch (je16_to_cpu(temp->u.nodetype)) {
 722                         case JFFS2_NODETYPE_INODE: {
 723                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
 724
 725                                 sino_ptr->nodetype = temp->i.nodetype;
 726                                 sino_ptr->inode = temp->i.inode;
 727                                 sino_ptr->version = temp->i.version;
 728                                 sino_ptr->offset = temp->i.offset;
 729                                 sino_ptr->totlen = temp->i.totlen;
 730
 731                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
 732
 733                                 break;
 734                         }
 735
 736                         case JFFS2_NODETYPE_DIRENT: {
 737                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
 738
 739                                 sdrnt_ptr->nodetype = temp->d.nodetype;
 740                                 sdrnt_ptr->totlen = temp->d.totlen;
 741                                 sdrnt_ptr->offset = temp->d.offset;
 742                                 sdrnt_ptr->pino = temp->d.pino;
 743                                 sdrnt_ptr->version = temp->d.version;
 744                                 sdrnt_ptr->ino = temp->d.ino;
 745                                 sdrnt_ptr->nsize = temp->d.nsize;
 746                                 sdrnt_ptr->type = temp->d.type;
 747
 748                                 memcpy(sdrnt_ptr->name, temp->d.name,
 749                                                         temp->d.nsize);
 750
 751                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
 752
 753                                 break;
 754                         }
 755 #ifdef CONFIG_JFFS2_FS_XATTR
 756                         case JFFS2_NODETYPE_XATTR: {
 757                                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
 758
 759                                 temp = c->summary->sum_list_head;
 760                                 sxattr_ptr->nodetype = temp->x.nodetype;
 761                                 sxattr_ptr->xid = temp->x.xid;
 762                                 sxattr_ptr->version = temp->x.version;
 763                                 sxattr_ptr->offset = temp->x.offset;
 764                                 sxattr_ptr->totlen = temp->x.totlen;
 765
 766                                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
 767                                 break;
 768                         }
 769                         case JFFS2_NODETYPE_XREF: {
 770                                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
 771
 772                                 temp = c->summary->sum_list_head;
 773                                 sxref_ptr->nodetype = temp->r.nodetype;
 774                                 sxref_ptr->offset = temp->r.offset;
 775
 776                                 wpage += JFFS2_SUMMARY_XREF_SIZE;
 777                                 break;
 778                         }
 779 #endif
 780                         default : {
 781                                 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
 782                                     == JFFS2_FEATURE_RWCOMPAT_COPY) {
 783                                         dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
 784                                                     je16_to_cpu(temp->u.nodetype));
 785                                         jffs2_sum_disable_collecting(c->summary);
 786                                 } else {
 787                                         BUG();  /* unknown node in summary information */
 788                                 }
 789                         }
 790                 }
 791
 792                 c->summary->sum_list_head = temp->u.next;
 793                 kfree(temp);
 794
 795                 c->summary->sum_num--;
 796         }
 797
 798         jffs2_sum_reset_collected(c->summary);
 799
 800         wpage += padsize;
 801
 802         sm = wpage;
 803         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
 804         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
 805
 806         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
 807         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
 808
 809         vecs[0].iov_base = &isum;
 810         vecs[0].iov_len = sizeof(isum);
 811         vecs[1].iov_base = c->summary->sum_buf;
 812         vecs[1].iov_len = datasize;
 813
 814         sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
 815
 816         dbg_summary("writing out data to flash to pos : 0x%08x\n", sum_ofs);
 817
 818         ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
 819
 820         if (ret || (retlen != infosize)) {
 821
 822                 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
 823                               infosize, sum_ofs, ret, retlen);
 824
 825                 if (retlen) {
 826                         /* Waste remaining space */
 827                         spin_lock(&c->erase_completion_lock);
 828                         jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
 829                         spin_unlock(&c->erase_completion_lock);
 830                 }
 831
 832                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 833
 834                 return 0;
 835         }
 836
 837         spin_lock(&c->erase_completion_lock);
 838         jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
 839         spin_unlock(&c->erase_completion_lock);
 840
 841         return 0;
 842 }
 843
 844 /* Write out summary information - called from jffs2_do_reserve_space */
 845
 846 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
 847 {
 848         int datasize, infosize, padsize;
 849         struct jffs2_eraseblock *jeb;
 850         int ret = 0;
 851
 852         dbg_summary("called\n");
 853
 854         spin_unlock(&c->erase_completion_lock);
 855
 856         jeb = c->nextblock;
 857         jffs2_prealloc_raw_node_refs(c, jeb, 1);
 858
 859         if (!c->summary->sum_num || !c->summary->sum_list_head) {
 860                 JFFS2_WARNING("Empty summary info!!!\n");
 861                 BUG();
 862         }
 863
 864         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
 865         infosize = sizeof(struct jffs2_raw_summary) + datasize;
 866         padsize = jeb->free_size - infosize;
 867         infosize += padsize;
 868         datasize += padsize;
 869
 870         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
 871         spin_lock(&c->erase_completion_lock);
 872         return ret;
 873 }