linux/fs/jffs2/summary.c
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   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
  26int 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
  50void 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
  63static 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
 108int 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
 115int 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
 133int 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
 158int 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
 176int 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
 193static 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
 210void 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
 217void 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
 224int 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
 231void 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
 248int 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
 365no_mem:
 366        JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
 367        return -ENOMEM;
 368}
 369
 370static 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
 386static 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() */
 572int 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
 666crc_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
 674static 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
 846int 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}
 874
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