fs/jffs2/summary.c

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright (C) 2004  Ferenc Havasi <havasi@inf.u-szeged.hu>,
   5  *                     Zoltan Sogor <weth@inf.u-szeged.hu>,
   6  *                     Patrik Kluba <pajko@halom.u-szeged.hu>,
   7  *                     University of Szeged, Hungary
   8  *               2005  KaiGai Kohei <kaigai@ak.jp.nec.com>
   9  *
  10  * For licensing information, see the file 'LICENCE' in this directory.
  11  *
  12  * $Id: summary.c,v 1.4 2005/09/26 11:37:21 havasi Exp $
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/sched.h>
  18 #include <linux/slab.h>
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/pagemap.h>
  21 #include <linux/crc32.h>
  22 #include <linux/compiler.h>
  23 #include <linux/vmalloc.h>
  24 #include "nodelist.h"
  25 #include "debug.h"
  26
  27 int jffs2_sum_init(struct jffs2_sb_info *c)
  28 {
  29         c->summary = kmalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
  30
  31         if (!c->summary) {
  32                 JFFS2_WARNING("Can't allocate memory for summary information!\n");
  33                 return -ENOMEM;
  34         }
  35
  36         memset(c->summary, 0, sizeof(struct jffs2_summary));
  37
  38         c->summary->sum_buf = vmalloc(c->sector_size);
  39
  40         if (!c->summary->sum_buf) {
  41                 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
  42                 kfree(c->summary);
  43                 return -ENOMEM;
  44         }
  45
  46         dbg_summary("returned succesfully\n");
  47
  48         return 0;
  49 }
  50
  51 void jffs2_sum_exit(struct jffs2_sb_info *c)
  52 {
  53         dbg_summary("called\n");
  54
  55         jffs2_sum_disable_collecting(c->summary);
  56
  57         vfree(c->summary->sum_buf);
  58         c->summary->sum_buf = NULL;
  59
  60         kfree(c->summary);
  61         c->summary = NULL;
  62 }
  63
  64 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
  65 {
  66         if (!s->sum_list_head)
  67                 s->sum_list_head = (union jffs2_sum_mem *) item;
  68         if (s->sum_list_tail)
  69                 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
  70         s->sum_list_tail = (union jffs2_sum_mem *) item;
  71
  72         switch (je16_to_cpu(item->u.nodetype)) {
  73                 case JFFS2_NODETYPE_INODE:
  74                         s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
  75                         s->sum_num++;
  76                         dbg_summary("inode (%u) added to summary\n",
  77                                                 je32_to_cpu(item->i.inode));
  78                         break;
  79                 case JFFS2_NODETYPE_DIRENT:
  80                         s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
  81                         s->sum_num++;
  82                         dbg_summary("dirent (%u) added to summary\n",
  83                                                 je32_to_cpu(item->d.ino));
  84                         break;
  85 #ifdef CONFIG_JFFS2_FS_XATTR
  86                 case JFFS2_NODETYPE_XATTR:
  87                         s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
  88                         s->sum_num++;
  89                         dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
  90                                     je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
  91                         break;
  92                 case JFFS2_NODETYPE_XREF:
  93                         s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
  94                         s->sum_num++;
  95                         dbg_summary("xref added to summary\n");
  96                         break;
  97 #endif
  98                 default:
  99                         JFFS2_WARNING("UNKNOWN node type %u\n",
 100                                             je16_to_cpu(item->u.nodetype));
 101                         return 1;
 102         }
 103         return 0;
 104 }
 105
 106
 107 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
 108
 109 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
 110 {
 111         dbg_summary("called with %u\n", size);
 112         s->sum_padded += size;
 113         return 0;
 114 }
 115
 116 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
 117                                 uint32_t ofs)
 118 {
 119         struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
 120
 121         if (!temp)
 122                 return -ENOMEM;
 123
 124         temp->nodetype = ri->nodetype;
 125         temp->inode = ri->ino;
 126         temp->version = ri->version;
 127         temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */
 128         temp->totlen = ri->totlen;
 129         temp->next = NULL;
 130
 131         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 132 }
 133
 134 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
 135                                 uint32_t ofs)
 136 {
 137         struct jffs2_sum_dirent_mem *temp =
 138                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
 139
 140         if (!temp)
 141                 return -ENOMEM;
 142
 143         temp->nodetype = rd->nodetype;
 144         temp->totlen = rd->totlen;
 145         temp->offset = cpu_to_je32(ofs);        /* relative from the begining of the jeb */
 146         temp->pino = rd->pino;
 147         temp->version = rd->version;
 148         temp->ino = rd->ino;
 149         temp->nsize = rd->nsize;
 150         temp->type = rd->type;
 151         temp->next = NULL;
 152
 153         memcpy(temp->name, rd->name, rd->nsize);
 154
 155         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 156 }
 157
 158 #ifdef CONFIG_JFFS2_FS_XATTR
 159 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
 160 {
 161         struct jffs2_sum_xattr_mem *temp;
 162
 163         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
 164         if (!temp)
 165                 return -ENOMEM;
 166
 167         temp->nodetype = rx->nodetype;
 168         temp->xid = rx->xid;
 169         temp->version = rx->version;
 170         temp->offset = cpu_to_je32(ofs);
 171         temp->totlen = rx->totlen;
 172         temp->next = NULL;
 173
 174         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 175 }
 176
 177 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
 178 {
 179         struct jffs2_sum_xref_mem *temp;
 180
 181         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
 182         if (!temp)
 183                 return -ENOMEM;
 184
 185         temp->nodetype = rr->nodetype;
 186         temp->offset = cpu_to_je32(ofs);
 187         temp->next = NULL;
 188
 189         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
 190 }
 191 #endif
 192 /* Cleanup every collected summary information */
 193
 194 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
 195 {
 196         union jffs2_sum_mem *temp;
 197
 198         if (!s->sum_list_head) {
 199                 dbg_summary("already empty\n");
 200         }
 201         while (s->sum_list_head) {
 202                 temp = s->sum_list_head;
 203                 s->sum_list_head = s->sum_list_head->u.next;
 204                 kfree(temp);
 205         }
 206         s->sum_list_tail = NULL;
 207         s->sum_padded = 0;
 208         s->sum_num = 0;
 209 }
 210
 211 void jffs2_sum_reset_collected(struct jffs2_summary *s)
 212 {
 213         dbg_summary("called\n");
 214         jffs2_sum_clean_collected(s);
 215         s->sum_size = 0;
 216 }
 217
 218 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
 219 {
 220         dbg_summary("called\n");
 221         jffs2_sum_clean_collected(s);
 222         s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 223 }
 224
 225 int jffs2_sum_is_disabled(struct jffs2_summary *s)
 226 {
 227         return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
 228 }
 229
 230 /* Move the collected summary information into sb (called from scan.c) */
 231
 232 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
 233 {
 234         dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
 235                                 c->summary->sum_size, c->summary->sum_num,
 236                                 s->sum_size, s->sum_num);
 237
 238         c->summary->sum_size = s->sum_size;
 239         c->summary->sum_num = s->sum_num;
 240         c->summary->sum_padded = s->sum_padded;
 241         c->summary->sum_list_head = s->sum_list_head;
 242         c->summary->sum_list_tail = s->sum_list_tail;
 243
 244         s->sum_list_head = s->sum_list_tail = NULL;
 245 }
 246
 247 /* Called from wbuf.c to collect writed node info */
 248
 249 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
 250                                 unsigned long count, uint32_t ofs)
 251 {
 252         union jffs2_node_union *node;
 253         struct jffs2_eraseblock *jeb;
 254
 255         node = invecs[0].iov_base;
 256         jeb = &c->blocks[ofs / c->sector_size];
 257         ofs -= jeb->offset;
 258
 259         switch (je16_to_cpu(node->u.nodetype)) {
 260                 case JFFS2_NODETYPE_INODE: {
 261                         struct jffs2_sum_inode_mem *temp =
 262                                 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
 263
 264                         if (!temp)
 265                                 goto no_mem;
 266
 267                         temp->nodetype = node->i.nodetype;
 268                         temp->inode = node->i.ino;
 269                         temp->version = node->i.version;
 270                         temp->offset = cpu_to_je32(ofs);
 271                         temp->totlen = node->i.totlen;
 272                         temp->next = NULL;
 273
 274                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 275                 }
 276
 277                 case JFFS2_NODETYPE_DIRENT: {
 278                         struct jffs2_sum_dirent_mem *temp =
 279                                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
 280
 281                         if (!temp)
 282                                 goto no_mem;
 283
 284                         temp->nodetype = node->d.nodetype;
 285                         temp->totlen = node->d.totlen;
 286                         temp->offset = cpu_to_je32(ofs);
 287                         temp->pino = node->d.pino;
 288                         temp->version = node->d.version;
 289                         temp->ino = node->d.ino;
 290                         temp->nsize = node->d.nsize;
 291                         temp->type = node->d.type;
 292                         temp->next = NULL;
 293
 294                         switch (count) {
 295                                 case 1:
 296                                         memcpy(temp->name,node->d.name,node->d.nsize);
 297                                         break;
 298
 299                                 case 2:
 300                                         memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
 301                                         break;
 302
 303                                 default:
 304                                         BUG();  /* impossible count value */
 305                                         break;
 306                         }
 307
 308                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 309                 }
 310 #ifdef CONFIG_JFFS2_FS_XATTR
 311                 case JFFS2_NODETYPE_XATTR: {
 312                         struct jffs2_sum_xattr_mem *temp;
 313                         if (je32_to_cpu(node->x.version) == 0xffffffff)
 314                                 return 0;
 315                         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
 316                         if (!temp)
 317                                 goto no_mem;
 318
 319                         temp->nodetype = node->x.nodetype;
 320                         temp->xid = node->x.xid;
 321                         temp->version = node->x.version;
 322                         temp->totlen = node->x.totlen;
 323                         temp->offset = cpu_to_je32(ofs);
 324                         temp->next = NULL;
 325
 326                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 327                 }
 328                 case JFFS2_NODETYPE_XREF: {
 329                         struct jffs2_sum_xref_mem *temp;
 330
 331                         if (je32_to_cpu(node->r.ino) == 0xffffffff
 332                             && je32_to_cpu(node->r.xid) == 0xffffffff)
 333                                 return 0;
 334                         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
 335                         if (!temp)
 336                                 goto no_mem;
 337                         temp->nodetype = node->r.nodetype;
 338                         temp->offset = cpu_to_je32(ofs);
 339                         temp->next = NULL;
 340
 341                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
 342                 }
 343 #endif
 344                 case JFFS2_NODETYPE_PADDING:
 345                         dbg_summary("node PADDING\n");
 346                         c->summary->sum_padded += je32_to_cpu(node->u.totlen);
 347                         break;
 348
 349                 case JFFS2_NODETYPE_CLEANMARKER:
 350                         dbg_summary("node CLEANMARKER\n");
 351                         break;
 352
 353                 case JFFS2_NODETYPE_SUMMARY:
 354                         dbg_summary("node SUMMARY\n");
 355                         break;
 356
 357                 default:
 358                         /* If you implement a new node type you should also implement
 359                            summary support for it or disable summary.
 360                         */
 361                         BUG();
 362                         break;
 363         }
 364
 365         return 0;
 366
 367 no_mem:
 368         JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
 369         return -ENOMEM;
 370 }
 371
 372
 373 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
 374
 375 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 376                                 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
 377 {
 378         struct jffs2_raw_node_ref *raw;
 379         struct jffs2_inode_cache *ic;
 380         struct jffs2_full_dirent *fd;
 381         void *sp;
 382         int i, ino;
 383
 384         sp = summary->sum;
 385
 386         for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
 387                 dbg_summary("processing summary index %d\n", i);
 388
 389                 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
 390                         case JFFS2_NODETYPE_INODE: {
 391                                 struct jffs2_sum_inode_flash *spi;
 392                                 spi = sp;
 393
 394                                 ino = je32_to_cpu(spi->inode);
 395
 396                                 dbg_summary("Inode at 0x%08x\n",
 397                                                         jeb->offset + je32_to_cpu(spi->offset));
 398
 399                                 raw = jffs2_alloc_raw_node_ref();
 400                                 if (!raw) {
 401                                         JFFS2_NOTICE("allocation of node reference failed\n");
 402                                         kfree(summary);
 403                                         return -ENOMEM;
 404                                 }
 405
 406                                 ic = jffs2_scan_make_ino_cache(c, ino);
 407                                 if (!ic) {
 408                                         JFFS2_NOTICE("scan_make_ino_cache failed\n");
 409                                         jffs2_free_raw_node_ref(raw);
 410                                         kfree(summary);
 411                                         return -ENOMEM;
 412                                 }
 413
 414                                 raw->flash_offset = (jeb->offset + je32_to_cpu(spi->offset)) | REF_UNCHECKED;
 415                                 raw->__totlen = PAD(je32_to_cpu(spi->totlen));
 416                                 raw->next_phys = NULL;
 417                                 raw->next_in_ino = ic->nodes;
 418
 419                                 ic->nodes = raw;
 420                                 if (!jeb->first_node)
 421                                         jeb->first_node = raw;
 422                                 if (jeb->last_node)
 423                                         jeb->last_node->next_phys = raw;
 424                                 jeb->last_node = raw;
 425                                 *pseudo_random += je32_to_cpu(spi->version);
 426
 427                                 UNCHECKED_SPACE(PAD(je32_to_cpu(spi->totlen)));
 428
 429                                 sp += JFFS2_SUMMARY_INODE_SIZE;
 430
 431                                 break;
 432                         }
 433
 434                         case JFFS2_NODETYPE_DIRENT: {
 435                                 struct jffs2_sum_dirent_flash *spd;
 436                                 spd = sp;
 437
 438                                 dbg_summary("Dirent at 0x%08x\n",
 439                                                         jeb->offset + je32_to_cpu(spd->offset));
 440
 441                                 fd = jffs2_alloc_full_dirent(spd->nsize+1);
 442                                 if (!fd) {
 443                                         kfree(summary);
 444                                         return -ENOMEM;
 445                                 }
 446
 447                                 memcpy(&fd->name, spd->name, spd->nsize);
 448                                 fd->name[spd->nsize] = 0;
 449
 450                                 raw = jffs2_alloc_raw_node_ref();
 451                                 if (!raw) {
 452                                         jffs2_free_full_dirent(fd);
 453                                         JFFS2_NOTICE("allocation of node reference failed\n");
 454                                         kfree(summary);
 455                                         return -ENOMEM;
 456                                 }
 457
 458                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
 459                                 if (!ic) {
 460                                         jffs2_free_full_dirent(fd);
 461                                         jffs2_free_raw_node_ref(raw);
 462                                         kfree(summary);
 463                                         return -ENOMEM;
 464                                 }
 465
 466                                 raw->__totlen = PAD(je32_to_cpu(spd->totlen));
 467                                 raw->flash_offset = (jeb->offset + je32_to_cpu(spd->offset)) | REF_PRISTINE;
 468                                 raw->next_phys = NULL;
 469                                 raw->next_in_ino = ic->nodes;
 470                                 ic->nodes = raw;
 471                                 if (!jeb->first_node)
 472                                         jeb->first_node = raw;
 473                                 if (jeb->last_node)
 474                                         jeb->last_node->next_phys = raw;
 475                                 jeb->last_node = raw;
 476
 477                                 fd->raw = raw;
 478                                 fd->next = NULL;
 479                                 fd->version = je32_to_cpu(spd->version);
 480                                 fd->ino = je32_to_cpu(spd->ino);
 481                                 fd->nhash = full_name_hash(fd->name, spd->nsize);
 482                                 fd->type = spd->type;
 483                                 USED_SPACE(PAD(je32_to_cpu(spd->totlen)));
 484                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
 485
 486                                 *pseudo_random += je32_to_cpu(spd->version);
 487
 488                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
 489
 490                                 break;
 491                         }
 492 #ifdef CONFIG_JFFS2_FS_XATTR
 493                         case JFFS2_NODETYPE_XATTR: {
 494                                 struct jffs2_xattr_datum *xd;
 495                                 struct jffs2_sum_xattr_flash *spx;
 496                                 uint32_t ofs;
 497
 498                                 spx = (struct jffs2_sum_xattr_flash *)sp;
 499                                 ofs = jeb->offset + je32_to_cpu(spx->offset);
 500                                 dbg_summary("xattr at %#08x (xid=%u, version=%u)\n", ofs,
 501                                             je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
 502                                 raw = jffs2_alloc_raw_node_ref();
 503                                 if (!raw) {
 504                                         JFFS2_NOTICE("allocation of node reference failed\n");
 505                                         kfree(summary);
 506                                         return -ENOMEM;
 507                                 }
 508                                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
 509                                                                 je32_to_cpu(spx->version));
 510                                 if (IS_ERR(xd)) {
 511                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
 512                                         jffs2_free_raw_node_ref(raw);
 513                                         kfree(summary);
 514                                         return PTR_ERR(xd);
 515                                 }
 516                                 xd->node = raw;
 517
 518                                 raw->flash_offset = ofs | REF_UNCHECKED;
 519                                 raw->__totlen = PAD(je32_to_cpu(spx->totlen));
 520                                 raw->next_phys = NULL;
 521                                 raw->next_in_ino = (void *)xd;
 522                                 if (!jeb->first_node)
 523                                         jeb->first_node = raw;
 524                                 if (jeb->last_node)
 525                                         jeb->last_node->next_phys = raw;
 526                                 jeb->last_node = raw;
 527
 528                                 *pseudo_random += je32_to_cpu(spx->xid);
 529                                 UNCHECKED_SPACE(je32_to_cpu(spx->totlen));
 530                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
 531
 532                                 break;
 533                         }
 534                         case JFFS2_NODETYPE_XREF: {
 535                                 struct jffs2_xattr_ref *ref;
 536                                 struct jffs2_sum_xref_flash *spr;
 537                                 uint32_t ofs;
 538
 539                                 spr = (struct jffs2_sum_xref_flash *)sp;
 540                                 ofs = jeb->offset + je32_to_cpu(spr->offset);
 541                                 dbg_summary("xref at %#08x (xid=%u, ino=%u)\n", ofs,
 542                                             je32_to_cpu(spr->xid), je32_to_cpu(spr->ino));
 543                                 raw = jffs2_alloc_raw_node_ref();
 544                                 if (!raw) {
 545                                         JFFS2_NOTICE("allocation of node reference failed\n");
 546                                         kfree(summary);
 547                                         return -ENOMEM;
 548                                 }
 549                                 ref = jffs2_alloc_xattr_ref();
 550                                 if (!ref) {
 551                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
 552                                         jffs2_free_raw_node_ref(raw);
 553                                         kfree(summary);
 554                                         return -ENOMEM;
 555                                 }
 556                                 ref->ino = 0xfffffffe;
 557                                 ref->xid = 0xfffffffd;
 558                                 ref->node = raw;
 559                                 ref->next = c->xref_temp;
 560                                 c->xref_temp = ref;
 561
 562                                 raw->__totlen = PAD(sizeof(struct jffs2_raw_xref));
 563                                 raw->flash_offset = ofs | REF_UNCHECKED;
 564                                 raw->next_phys = NULL;
 565                                 raw->next_in_ino = (void *)ref;
 566                                 if (!jeb->first_node)
 567                                         jeb->first_node = raw;
 568                                 if (jeb->last_node)
 569                                         jeb->last_node->next_phys = raw;
 570                                 jeb->last_node = raw;
 571
 572                                 UNCHECKED_SPACE(PAD(sizeof(struct jffs2_raw_xref)));
 573                                 *pseudo_random += ofs;
 574                                 sp += JFFS2_SUMMARY_XREF_SIZE;
 575
 576                                 break;
 577                         }
 578 #endif
 579                         default : {
 580 printk("nodetype = %#04x\n",je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype));
 581                                 JFFS2_WARNING("Unsupported node type found in summary! Exiting...");
 582                                 kfree(summary);
 583                                 return -EIO;
 584                         }
 585                 }
 586         }
 587
 588         kfree(summary);
 589         return 0;
 590 }
 591
 592 /* Process the summary node - called from jffs2_scan_eraseblock() */
 593
 594 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 595                                 uint32_t ofs, uint32_t *pseudo_random)
 596 {
 597         struct jffs2_unknown_node crcnode;
 598         struct jffs2_raw_node_ref *cache_ref;
 599         struct jffs2_raw_summary *summary;
 600         int ret, sumsize;
 601         uint32_t crc;
 602
 603         sumsize = c->sector_size - ofs;
 604         ofs += jeb->offset;
 605
 606         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
 607                                 jeb->offset, ofs, sumsize);
 608
 609         summary = kmalloc(sumsize, GFP_KERNEL);
 610
 611         if (!summary) {
 612                 return -ENOMEM;
 613         }
 614
 615         ret = jffs2_fill_scan_buf(c, (unsigned char *)summary, ofs, sumsize);
 616
 617         if (ret) {
 618                 kfree(summary);
 619                 return ret;
 620         }
 621
 622         /* OK, now check for node validity and CRC */
 623         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 624         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 625         crcnode.totlen = summary->totlen;
 626         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
 627
 628         if (je32_to_cpu(summary->hdr_crc) != crc) {
 629                 dbg_summary("Summary node header is corrupt (bad CRC or "
 630                                 "no summary at all)\n");
 631                 goto crc_err;
 632         }
 633
 634         if (je32_to_cpu(summary->totlen) != sumsize) {
 635                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
 636                 goto crc_err;
 637         }
 638
 639         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
 640
 641         if (je32_to_cpu(summary->node_crc) != crc) {
 642                 dbg_summary("Summary node is corrupt (bad CRC)\n");
 643                 goto crc_err;
 644         }
 645
 646         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
 647
 648         if (je32_to_cpu(summary->sum_crc) != crc) {
 649                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
 650                 goto crc_err;
 651         }
 652
 653         if ( je32_to_cpu(summary->cln_mkr) ) {
 654
 655                 dbg_summary("Summary : CLEANMARKER node \n");
 656
 657                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
 658                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
 659                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
 660                         UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr)));
 661                 } else if (jeb->first_node) {
 662                         dbg_summary("CLEANMARKER node not first node in block "
 663                                         "(0x%08x)\n", jeb->offset);
 664                         UNCHECKED_SPACE(PAD(je32_to_cpu(summary->cln_mkr)));
 665                 } else {
 666                         struct jffs2_raw_node_ref *marker_ref = jffs2_alloc_raw_node_ref();
 667
 668                         if (!marker_ref) {
 669                                 JFFS2_NOTICE("Failed to allocate node ref for clean marker\n");
 670                                 kfree(summary);
 671                                 return -ENOMEM;
 672                         }
 673
 674                         marker_ref->next_in_ino = NULL;
 675                         marker_ref->next_phys = NULL;
 676                         marker_ref->flash_offset = jeb->offset | REF_NORMAL;
 677                         marker_ref->__totlen = je32_to_cpu(summary->cln_mkr);
 678                         jeb->first_node = jeb->last_node = marker_ref;
 679
 680                         USED_SPACE( PAD(je32_to_cpu(summary->cln_mkr)) );
 681                 }
 682         }
 683
 684         if (je32_to_cpu(summary->padded)) {
 685                 DIRTY_SPACE(je32_to_cpu(summary->padded));
 686         }
 687
 688         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
 689         if (ret)
 690                 return ret;
 691
 692         /* for PARANOIA_CHECK */
 693         cache_ref = jffs2_alloc_raw_node_ref();
 694
 695         if (!cache_ref) {
 696                 JFFS2_NOTICE("Failed to allocate node ref for cache\n");
 697                 return -ENOMEM;
 698         }
 699
 700         cache_ref->next_in_ino = NULL;
 701         cache_ref->next_phys = NULL;
 702         cache_ref->flash_offset = ofs | REF_NORMAL;
 703         cache_ref->__totlen = sumsize;
 704
 705         if (!jeb->first_node)
 706                 jeb->first_node = cache_ref;
 707         if (jeb->last_node)
 708                 jeb->last_node->next_phys = cache_ref;
 709         jeb->last_node = cache_ref;
 710
 711         USED_SPACE(sumsize);
 712
 713         jeb->wasted_size += jeb->free_size;
 714         c->wasted_size += jeb->free_size;
 715         c->free_size -= jeb->free_size;
 716         jeb->free_size = 0;
 717
 718         return jffs2_scan_classify_jeb(c, jeb);
 719
 720 crc_err:
 721         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
 722
 723         return 0;
 724 }
 725
 726 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
 727
 728 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 729                                         uint32_t infosize, uint32_t datasize, int padsize)
 730 {
 731         struct jffs2_raw_summary isum;
 732         union jffs2_sum_mem *temp;
 733         struct jffs2_sum_marker *sm;
 734         struct kvec vecs[2];
 735         void *wpage;
 736         int ret;
 737         size_t retlen;
 738
 739         memset(c->summary->sum_buf, 0xff, datasize);
 740         memset(&isum, 0, sizeof(isum));
 741
 742         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 743         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
 744         isum.totlen = cpu_to_je32(infosize);
 745         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
 746         isum.padded = cpu_to_je32(c->summary->sum_padded);
 747         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
 748         isum.sum_num = cpu_to_je32(c->summary->sum_num);
 749         wpage = c->summary->sum_buf;
 750
 751         while (c->summary->sum_num) {
 752                 temp = c->summary->sum_list_head;
 753
 754                 switch (je16_to_cpu(temp->u.nodetype)) {
 755                         case JFFS2_NODETYPE_INODE: {
 756                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
 757
 758                                 sino_ptr->nodetype = temp->i.nodetype;
 759                                 sino_ptr->inode = temp->i.inode;
 760                                 sino_ptr->version = temp->i.version;
 761                                 sino_ptr->offset = temp->i.offset;
 762                                 sino_ptr->totlen = temp->i.totlen;
 763
 764                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
 765
 766                                 break;
 767                         }
 768
 769                         case JFFS2_NODETYPE_DIRENT: {
 770                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
 771
 772                                 sdrnt_ptr->nodetype = temp->d.nodetype;
 773                                 sdrnt_ptr->totlen = temp->d.totlen;
 774                                 sdrnt_ptr->offset = temp->d.offset;
 775                                 sdrnt_ptr->pino = temp->d.pino;
 776                                 sdrnt_ptr->version = temp->d.version;
 777                                 sdrnt_ptr->ino = temp->d.ino;
 778                                 sdrnt_ptr->nsize = temp->d.nsize;
 779                                 sdrnt_ptr->type = temp->d.type;
 780
 781                                 memcpy(sdrnt_ptr->name, temp->d.name,
 782                                                         temp->d.nsize);
 783
 784                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
 785
 786                                 break;
 787                         }
 788 #ifdef CONFIG_JFFS2_FS_XATTR
 789                         case JFFS2_NODETYPE_XATTR: {
 790                                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
 791
 792                                 temp = c->summary->sum_list_head;
 793                                 sxattr_ptr->nodetype = temp->x.nodetype;
 794                                 sxattr_ptr->xid = temp->x.xid;
 795                                 sxattr_ptr->version = temp->x.version;
 796                                 sxattr_ptr->offset = temp->x.offset;
 797                                 sxattr_ptr->totlen = temp->x.totlen;
 798
 799                                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
 800                                 break;
 801                         }
 802                         case JFFS2_NODETYPE_XREF: {
 803                                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
 804
 805                                 temp = c->summary->sum_list_head;
 806                                 sxref_ptr->nodetype = temp->r.nodetype;
 807                                 sxref_ptr->offset = temp->r.offset;
 808
 809                                 wpage += JFFS2_SUMMARY_XREF_SIZE;
 810                                 break;
 811                         }
 812 #endif
 813                         default : {
 814                                 BUG();  /* unknown node in summary information */
 815                         }
 816                 }
 817
 818                 c->summary->sum_list_head = temp->u.next;
 819                 kfree(temp);
 820
 821                 c->summary->sum_num--;
 822         }
 823
 824         jffs2_sum_reset_collected(c->summary);
 825
 826         wpage += padsize;
 827
 828         sm = wpage;
 829         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
 830         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
 831
 832         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
 833         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
 834
 835         vecs[0].iov_base = &isum;
 836         vecs[0].iov_len = sizeof(isum);
 837         vecs[1].iov_base = c->summary->sum_buf;
 838         vecs[1].iov_len = datasize;
 839
 840         dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
 841                         jeb->offset + c->sector_size - jeb->free_size);
 842
 843         spin_unlock(&c->erase_completion_lock);
 844         ret = jffs2_flash_writev(c, vecs, 2, jeb->offset + c->sector_size -
 845                                 jeb->free_size, &retlen, 0);
 846         spin_lock(&c->erase_completion_lock);
 847
 848
 849         if (ret || (retlen != infosize)) {
 850                 JFFS2_WARNING("Write of %d bytes at 0x%08x failed. returned %d, retlen %zu\n",
 851                         infosize, jeb->offset + c->sector_size - jeb->free_size, ret, retlen);
 852
 853                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
 854                 WASTED_SPACE(infosize);
 855
 856                 return 1;
 857         }
 858
 859         return 0;
 860 }
 861
 862 /* Write out summary information - called from jffs2_do_reserve_space */
 863
 864 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
 865 {
 866         struct jffs2_raw_node_ref *summary_ref;
 867         int datasize, infosize, padsize, ret;
 868         struct jffs2_eraseblock *jeb;
 869
 870         dbg_summary("called\n");
 871
 872         jeb = c->nextblock;
 873
 874         if (!c->summary->sum_num || !c->summary->sum_list_head) {
 875                 JFFS2_WARNING("Empty summary info!!!\n");
 876                 BUG();
 877         }
 878
 879         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
 880         infosize = sizeof(struct jffs2_raw_summary) + datasize;
 881         padsize = jeb->free_size - infosize;
 882         infosize += padsize;
 883         datasize += padsize;
 884
 885         /* Is there enough space for summary? */
 886         if (padsize < 0) {
 887                 /* don't try to write out summary for this jeb */
 888                 jffs2_sum_disable_collecting(c->summary);
 889
 890                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
 891                 return 0;
 892         }
 893
 894         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
 895         if (ret)
 896                 return 0; /* can't write out summary, block is marked as NOSUM_SIZE */
 897
 898         /* for ACCT_PARANOIA_CHECK */
 899         spin_unlock(&c->erase_completion_lock);
 900         summary_ref = jffs2_alloc_raw_node_ref();
 901         spin_lock(&c->erase_completion_lock);
 902
 903         if (!summary_ref) {
 904                 JFFS2_NOTICE("Failed to allocate node ref for summary\n");
 905                 return -ENOMEM;
 906         }
 907
 908         summary_ref->next_in_ino = NULL;
 909         summary_ref->next_phys = NULL;
 910         summary_ref->flash_offset = (jeb->offset + c->sector_size - jeb->free_size) | REF_NORMAL;
 911         summary_ref->__totlen = infosize;
 912
 913         if (!jeb->first_node)
 914                 jeb->first_node = summary_ref;
 915         if (jeb->last_node)
 916                 jeb->last_node->next_phys = summary_ref;
 917         jeb->last_node = summary_ref;
 918
 919         USED_SPACE(infosize);
 920
 921         return 0;
 922 }