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         uint32_t sum_size = max_t(uint32_t, c->sector_size, MAX_SUMMARY_SIZE);
  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 = kmalloc(sum_size, GFP_KERNEL);
  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         kfree(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                                 int checkedlen;
 435                                 spd = sp;
 436
 437                                 dbg_summary("Dirent at 0x%08x-0x%08x\n",
 438                                             jeb->offset + je32_to_cpu(spd->offset),
 439                                             jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
 440
 441
 442                                 /* This should never happen, but https://dev.laptop.org/ticket/4184 */
 443                                 checkedlen = strnlen(spd->name, spd->nsize);
 444                                 if (!checkedlen) {
 445                                         printk(KERN_ERR "Dirent at %08x has zero at start of name. Aborting mount.\n",
 446                                                jeb->offset + je32_to_cpu(spd->offset));
 447                                         return -EIO;
 448                                 }
 449                                 if (checkedlen < spd->nsize) {
 450                                         printk(KERN_ERR "Dirent at %08x has zeroes in name. Truncating to %d chars\n",
 451                                                jeb->offset + je32_to_cpu(spd->offset), checkedlen);
 452                                 }
 453
 454
 455                                 fd = jffs2_alloc_full_dirent(checkedlen+1);
 456                                 if (!fd)
 457                                         return -ENOMEM;
 458
 459                                 memcpy(&fd->name, spd->name, checkedlen);
 460                                 fd->name[checkedlen] = 0;
 461
 462                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
 463                                 if (!ic) {
 464                                         jffs2_free_full_dirent(fd);
 465                                         return -ENOMEM;
 466                                 }
 467
 468                                 fd->raw = sum_link_node_ref(c, jeb,  je32_to_cpu(spd->offset) | REF_UNCHECKED,
 469                                                             PAD(je32_to_cpu(spd->totlen)), ic);
 470
 471                                 fd->next = NULL;
 472                                 fd->version = je32_to_cpu(spd->version);
 473                                 fd->ino = je32_to_cpu(spd->ino);
 474                                 fd->nhash = full_name_hash(fd->name, checkedlen);
 475                                 fd->type = spd->type;
 476
 477                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
 478
 479                                 *pseudo_random += je32_to_cpu(spd->version);
 480
 481                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
 482
 483                                 break;
 484                         }
 485 #ifdef CONFIG_JFFS2_FS_XATTR
 486                         case JFFS2_NODETYPE_XATTR: {
 487                                 struct jffs2_xattr_datum *xd;
 488                                 struct jffs2_sum_xattr_flash *spx;
 489
 490                                 spx = (struct jffs2_sum_xattr_flash *)sp;
 491                                 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n",
 492                                             jeb->offset + je32_to_cpu(spx->offset),
 493                                             jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
 494                                             je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
 495
 496                                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
 497                                                                 je32_to_cpu(spx->version));
 498                                 if (IS_ERR(xd))
 499                                         return PTR_ERR(xd);
 500                                 if (xd->version > je32_to_cpu(spx->version)) {
 501                                         /* node is not the newest one */
 502                                         struct jffs2_raw_node_ref *raw
 503                                                 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
 504                                                                     PAD(je32_to_cpu(spx->totlen)), NULL);
 505                                         raw->next_in_ino = xd->node->next_in_ino;
 506                                         xd->node->next_in_ino = raw;
 507                                 } else {
 508                                         xd->version = je32_to_cpu(spx->version);
 509                                         sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
 510                                                           PAD(je32_to_cpu(spx->totlen)), (void *)xd);
 511                                 }
 512                                 *pseudo_random += je32_to_cpu(spx->xid);
 513                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
 514
 515                                 break;
 516                         }
 517                         case JFFS2_NODETYPE_XREF: {
 518                                 struct jffs2_xattr_ref *ref;
 519                                 struct jffs2_sum_xref_flash *spr;
 520
 521                                 spr = (struct jffs2_sum_xref_flash *)sp;
 522                                 dbg_summary("xref at %#08x-%#08x\n",
 523                                             jeb->offset + je32_to_cpu(spr->offset),
 524                                             jeb->offset + je32_to_cpu(spr->offset) +
 525                                             (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
 526
 527                                 ref = jffs2_alloc_xattr_ref();
 528                                 if (!ref) {
 529                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
 530                                         return -ENOMEM;
 531                                 }
 532                                 ref->next = c->xref_temp;
 533                                 c->xref_temp = ref;
 534
 535                                 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
 536                                                   PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
 537
 538                                 *pseudo_random += ref->node->flash_offset;
 539                                 sp += JFFS2_SUMMARY_XREF_SIZE;
 540
 541                                 break;
 542                         }
 543 #endif
 544                         default : {
 545                                 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
 546                                 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
 547                                 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
 548                                         return -EIO;
 549
 550                                 /* For compatible node types, just fall back to the full scan */
 551                                 c->wasted_size -= jeb->wasted_size;
 552                                 c->free_size += c->sector_size - jeb->free_size;
 553                                 c->used_size -= jeb->used_size;
 554                                 c->dirty_size -= jeb->dirty_size;
 555                                 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
 556                                 jeb->free_size = c->sector_size;
 557
 558                                 jffs2_free_jeb_node_refs(c, jeb);
 559                                 return -ENOTRECOVERABLE;
 560                         }
 561                 }
 562         }
 563         return 0;
 564 }
 565
 566 /* Process the summary node - called from jffs2_scan_eraseblock() */
 567 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 568                            struct jffs2_raw_summary *summary, uint32_t sumsize,
 569                            uint32_t *pseudo_random)
 570 {
 571         struct jffs2_unknown_node crcnode;
 572         int ret, ofs;
 573         uint32_t crc;
 574
 575         ofs = c->sector_size - sumsize;
 576
 577         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
 578                     jeb->offset, jeb->offset + ofs, sumsize);
 579
 580         /* OK, now check for node validity and CRC */
 581         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 582         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 583         crcnode.totlen = summary->totlen;
 584         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
 585
 586         if (je32_to_cpu(summary->hdr_crc) != crc) {
 587                 dbg_summary("Summary node header is corrupt (bad CRC or "
 588                                 "no summary at all)\n");
 589                 goto crc_err;
 590         }
 591
 592         if (je32_to_cpu(summary->totlen) != sumsize) {
 593                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
 594                 goto crc_err;
 595         }
 596
 597         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
 598
 599         if (je32_to_cpu(summary->node_crc) != crc) {
 600                 dbg_summary("Summary node is corrupt (bad CRC)\n");
 601                 goto crc_err;
 602         }
 603
 604         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
 605
 606         if (je32_to_cpu(summary->sum_crc) != crc) {
 607                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
 608                 goto crc_err;
 609         }
 610
 611         if ( je32_to_cpu(summary->cln_mkr) ) {
 612
 613                 dbg_summary("Summary : CLEANMARKER node \n");
 614
 615                 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
 616                 if (ret)
 617                         return ret;
 618
 619                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
 620                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
 621                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
 622                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
 623                                 return ret;
 624                 } else if (jeb->first_node) {
 625                         dbg_summary("CLEANMARKER node not first node in block "
 626                                         "(0x%08x)\n", jeb->offset);
 627                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
 628                                 return ret;
 629                 } else {
 630                         jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
 631                                             je32_to_cpu(summary->cln_mkr), NULL);
 632                 }
 633         }
 634
 635         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
 636         /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
 637            scan of this eraseblock. So return zero */
 638         if (ret == -ENOTRECOVERABLE)
 639                 return 0;
 640         if (ret)
 641                 return ret;             /* real error */
 642
 643         /* for PARANOIA_CHECK */
 644         ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
 645         if (ret)
 646                 return ret;
 647
 648         sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
 649
 650         if (unlikely(jeb->free_size)) {
 651                 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
 652                               jeb->free_size, jeb->offset);
 653                 jeb->wasted_size += jeb->free_size;
 654                 c->wasted_size += jeb->free_size;
 655                 c->free_size -= jeb->free_size;
 656                 jeb->free_size = 0;
 657         }
 658
 659         return jffs2_scan_classify_jeb(c, jeb);
 660
 661 crc_err:
 662         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
 663
 664         return 0;
 665 }
 666
 667 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
 668
 669 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 670                                 uint32_t infosize, uint32_t datasize, int padsize)
 671 {
 672         struct jffs2_raw_summary isum;
 673         union jffs2_sum_mem *temp;
 674         struct jffs2_sum_marker *sm;
 675         struct kvec vecs[2];
 676         uint32_t sum_ofs;
 677         void *wpage;
 678         int ret;
 679         size_t retlen;
 680
 681         if (padsize + datasize > MAX_SUMMARY_SIZE) {
 682                 /* It won't fit in the buffer. Abort summary for this jeb */
 683                 jffs2_sum_disable_collecting(c->summary);
 684
 685                 JFFS2_WARNING("Summary too big (%d data, %d pad) in eraseblock at %08x\n",
 686                               datasize, padsize, jeb->offset);
 687                 /* Non-fatal */
 688                 return 0;
 689         }
 690         /* Is there enough space for summary? */
 691         if (padsize < 0) {
 692                 /* don't try to write out summary for this jeb */
 693                 jffs2_sum_disable_collecting(c->summary);
 694
 695                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n",
 696                               padsize);
 697                 /* Non-fatal */
 698                 return 0;
 699         }
 700
 701         memset(c->summary->sum_buf, 0xff, datasize);
 702         memset(&isum, 0, sizeof(isum));
 703
 704         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 705         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 706         isum.totlen = cpu_to_je32(infosize);
 707         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
 708         isum.padded = cpu_to_je32(c->summary->sum_padded);
 709         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
 710         isum.sum_num = cpu_to_je32(c->summary->sum_num);
 711         wpage = c->summary->sum_buf;
 712
 713         while (c->summary->sum_num) {
 714                 temp = c->summary->sum_list_head;
 715
 716                 switch (je16_to_cpu(temp->u.nodetype)) {
 717                         case JFFS2_NODETYPE_INODE: {
 718                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
 719
 720                                 sino_ptr->nodetype = temp->i.nodetype;
 721                                 sino_ptr->inode = temp->i.inode;
 722                                 sino_ptr->version = temp->i.version;
 723                                 sino_ptr->offset = temp->i.offset;
 724                                 sino_ptr->totlen = temp->i.totlen;
 725
 726                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
 727
 728                                 break;
 729                         }
 730
 731                         case JFFS2_NODETYPE_DIRENT: {
 732                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
 733
 734                                 sdrnt_ptr->nodetype = temp->d.nodetype;
 735                                 sdrnt_ptr->totlen = temp->d.totlen;
 736                                 sdrnt_ptr->offset = temp->d.offset;
 737                                 sdrnt_ptr->pino = temp->d.pino;
 738                                 sdrnt_ptr->version = temp->d.version;
 739                                 sdrnt_ptr->ino = temp->d.ino;
 740                                 sdrnt_ptr->nsize = temp->d.nsize;
 741                                 sdrnt_ptr->type = temp->d.type;
 742
 743                                 memcpy(sdrnt_ptr->name, temp->d.name,
 744                                                         temp->d.nsize);
 745
 746                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
 747
 748                                 break;
 749                         }
 750 #ifdef CONFIG_JFFS2_FS_XATTR
 751                         case JFFS2_NODETYPE_XATTR: {
 752                                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
 753
 754                                 temp = c->summary->sum_list_head;
 755                                 sxattr_ptr->nodetype = temp->x.nodetype;
 756                                 sxattr_ptr->xid = temp->x.xid;
 757                                 sxattr_ptr->version = temp->x.version;
 758                                 sxattr_ptr->offset = temp->x.offset;
 759                                 sxattr_ptr->totlen = temp->x.totlen;
 760
 761                                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
 762                                 break;
 763                         }
 764                         case JFFS2_NODETYPE_XREF: {
 765                                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
 766
 767                                 temp = c->summary->sum_list_head;
 768                                 sxref_ptr->nodetype = temp->r.nodetype;
 769                                 sxref_ptr->offset = temp->r.offset;
 770
 771                                 wpage += JFFS2_SUMMARY_XREF_SIZE;
 772                                 break;
 773                         }
 774 #endif
 775                         default : {
 776                                 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
 777                                     == JFFS2_FEATURE_RWCOMPAT_COPY) {
 778                                         dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
 779                                                     je16_to_cpu(temp->u.nodetype));
 780                                         jffs2_sum_disable_collecting(c->summary);
 781                                 } else {
 782                                         BUG();  /* unknown node in summary information */
 783                                 }
 784                         }
 785                 }
 786
 787                 c->summary->sum_list_head = temp->u.next;
 788                 kfree(temp);
 789
 790                 c->summary->sum_num--;
 791         }
 792
 793         jffs2_sum_reset_collected(c->summary);
 794
 795         wpage += padsize;
 796
 797         sm = wpage;
 798         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
 799         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
 800
 801         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
 802         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
 803
 804         vecs[0].iov_base = &isum;
 805         vecs[0].iov_len = sizeof(isum);
 806         vecs[1].iov_base = c->summary->sum_buf;
 807         vecs[1].iov_len = datasize;
 808
 809         sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
 810
 811         dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
 812                     sum_ofs);
 813
 814         ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
 815
 816         if (ret || (retlen != infosize)) {
 817
 818                 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
 819                               infosize, sum_ofs, ret, retlen);
 820
 821                 if (retlen) {
 822                         /* Waste remaining space */
 823                         spin_lock(&c->erase_completion_lock);
 824                         jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
 825                         spin_unlock(&c->erase_completion_lock);
 826                 }
 827
 828                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 829
 830                 return 0;
 831         }
 832
 833         spin_lock(&c->erase_completion_lock);
 834         jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
 835         spin_unlock(&c->erase_completion_lock);
 836
 837         return 0;
 838 }
 839
 840 /* Write out summary information - called from jffs2_do_reserve_space */
 841
 842 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
 843 {
 844         int datasize, infosize, padsize;
 845         struct jffs2_eraseblock *jeb;
 846         int ret = 0;
 847
 848         dbg_summary("called\n");
 849
 850         spin_unlock(&c->erase_completion_lock);
 851
 852         jeb = c->nextblock;
 853         jffs2_prealloc_raw_node_refs(c, jeb, 1);
 854
 855         if (!c->summary->sum_num || !c->summary->sum_list_head) {
 856                 JFFS2_WARNING("Empty summary info!!!\n");
 857                 BUG();
 858         }
 859
 860         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
 861         infosize = sizeof(struct jffs2_raw_summary) + datasize;
 862         padsize = jeb->free_size - infosize;
 863         infosize += padsize;
 864         datasize += padsize;
 865
 866         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
 867         spin_lock(&c->erase_completion_lock);
 868         return ret;
 869 }