fs/ubifs/ubifs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * This file is part of UBIFS.
   4  *
   5  * Copyright (C) 2006-2008 Nokia Corporation.
   6  *
   7  * (C) Copyright 2008-2010
   8  * Stefan Roese, DENX Software Engineering, sr@denx.de.
   9  *
  10  * Authors: Artem Bityutskiy (Битюцкий Артём)
  11  *          Adrian Hunter
  12  */
  13
  14 #include <common.h>
  15 #include <memalign.h>
  16 #include "ubifs.h"
  17 #include <u-boot/zlib.h>
  18
  19 #include <linux/err.h>
  20 #include <linux/lzo.h>
  21
  22 DECLARE_GLOBAL_DATA_PTR;
  23
  24 /* compress.c */
  25
  26 /*
  27  * We need a wrapper for zunzip() because the parameters are
  28  * incompatible with the lzo decompressor.
  29  */
  30 static int gzip_decompress(const unsigned char *in, size_t in_len,
  31                            unsigned char *out, size_t *out_len)
  32 {
  33         return zunzip(out, *out_len, (unsigned char *)in,
  34                       (unsigned long *)out_len, 0, 0);
  35 }
  36
  37 /* Fake description object for the "none" compressor */
  38 static struct ubifs_compressor none_compr = {
  39         .compr_type = UBIFS_COMPR_NONE,
  40         .name = "none",
  41         .capi_name = "",
  42         .decompress = NULL,
  43 };
  44
  45 static struct ubifs_compressor lzo_compr = {
  46         .compr_type = UBIFS_COMPR_LZO,
  47 #ifndef __UBOOT__
  48         .comp_mutex = &lzo_mutex,
  49 #endif
  50         .name = "lzo",
  51         .capi_name = "lzo",
  52         .decompress = lzo1x_decompress_safe,
  53 };
  54
  55 static struct ubifs_compressor zlib_compr = {
  56         .compr_type = UBIFS_COMPR_ZLIB,
  57 #ifndef __UBOOT__
  58         .comp_mutex = &deflate_mutex,
  59         .decomp_mutex = &inflate_mutex,
  60 #endif
  61         .name = "zlib",
  62         .capi_name = "deflate",
  63         .decompress = gzip_decompress,
  64 };
  65
  66 /* All UBIFS compressors */
  67 struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
  68
  69
  70 #ifdef __UBOOT__
  71 /* from mm/util.c */
  72
  73 /**
  74  * kmemdup - duplicate region of memory
  75  *
  76  * @src: memory region to duplicate
  77  * @len: memory region length
  78  * @gfp: GFP mask to use
  79  */
  80 void *kmemdup(const void *src, size_t len, gfp_t gfp)
  81 {
  82         void *p;
  83
  84         p = kmalloc(len, gfp);
  85         if (p)
  86                 memcpy(p, src, len);
  87         return p;
  88 }
  89
  90 struct crypto_comp {
  91         int compressor;
  92 };
  93
  94 static inline struct crypto_comp
  95 *crypto_alloc_comp(const char *alg_name, u32 type, u32 mask)
  96 {
  97         struct ubifs_compressor *comp;
  98         struct crypto_comp *ptr;
  99         int i = 0;
 100
 101         ptr = malloc_cache_aligned(sizeof(struct crypto_comp));
 102         while (i < UBIFS_COMPR_TYPES_CNT) {
 103                 comp = ubifs_compressors[i];
 104                 if (!comp) {
 105                         i++;
 106                         continue;
 107                 }
 108                 if (strncmp(alg_name, comp->capi_name, strlen(alg_name)) == 0) {
 109                         ptr->compressor = i;
 110                         return ptr;
 111                 }
 112                 i++;
 113         }
 114         if (i >= UBIFS_COMPR_TYPES_CNT) {
 115                 dbg_gen("invalid compression type %s", alg_name);
 116                 free (ptr);
 117                 return NULL;
 118         }
 119         return ptr;
 120 }
 121 static inline int
 122 crypto_comp_decompress(const struct ubifs_info *c, struct crypto_comp *tfm,
 123                        const u8 *src, unsigned int slen, u8 *dst,
 124                        unsigned int *dlen)
 125 {
 126         struct ubifs_compressor *compr = ubifs_compressors[tfm->compressor];
 127         int err;
 128
 129         if (compr->compr_type == UBIFS_COMPR_NONE) {
 130                 memcpy(dst, src, slen);
 131                 *dlen = slen;
 132                 return 0;
 133         }
 134
 135         err = compr->decompress(src, slen, dst, (size_t *)dlen);
 136         if (err)
 137                 ubifs_err(c, "cannot decompress %d bytes, compressor %s, "
 138                           "error %d", slen, compr->name, err);
 139
 140         return err;
 141
 142         return 0;
 143 }
 144
 145 /* from shrinker.c */
 146
 147 /* Global clean znode counter (for all mounted UBIFS instances) */
 148 atomic_long_t ubifs_clean_zn_cnt;
 149
 150 #endif
 151
 152 /**
 153  * ubifs_decompress - decompress data.
 154  * @in_buf: data to decompress
 155  * @in_len: length of the data to decompress
 156  * @out_buf: output buffer where decompressed data should
 157  * @out_len: output length is returned here
 158  * @compr_type: type of compression
 159  *
 160  * This function decompresses data from buffer @in_buf into buffer @out_buf.
 161  * The length of the uncompressed data is returned in @out_len. This functions
 162  * returns %0 on success or a negative error code on failure.
 163  */
 164 int ubifs_decompress(const struct ubifs_info *c, const void *in_buf,
 165                      int in_len, void *out_buf, int *out_len, int compr_type)
 166 {
 167         int err;
 168         struct ubifs_compressor *compr;
 169
 170         if (unlikely(compr_type < 0 || compr_type >= UBIFS_COMPR_TYPES_CNT)) {
 171                 ubifs_err(c, "invalid compression type %d", compr_type);
 172                 return -EINVAL;
 173         }
 174
 175         compr = ubifs_compressors[compr_type];
 176
 177         if (unlikely(!compr->capi_name)) {
 178                 ubifs_err(c, "%s compression is not compiled in", compr->name);
 179                 return -EINVAL;
 180         }
 181
 182         if (compr_type == UBIFS_COMPR_NONE) {
 183                 memcpy(out_buf, in_buf, in_len);
 184                 *out_len = in_len;
 185                 return 0;
 186         }
 187
 188         if (compr->decomp_mutex)
 189                 mutex_lock(compr->decomp_mutex);
 190         err = crypto_comp_decompress(c, compr->cc, in_buf, in_len, out_buf,
 191                                      (unsigned int *)out_len);
 192         if (compr->decomp_mutex)
 193                 mutex_unlock(compr->decomp_mutex);
 194         if (err)
 195                 ubifs_err(c, "cannot decompress %d bytes, compressor %s,"
 196                           " error %d", in_len, compr->name, err);
 197
 198         return err;
 199 }
 200
 201 /**
 202  * compr_init - initialize a compressor.
 203  * @compr: compressor description object
 204  *
 205  * This function initializes the requested compressor and returns zero in case
 206  * of success or a negative error code in case of failure.
 207  */
 208 static int __init compr_init(struct ubifs_compressor *compr)
 209 {
 210         ubifs_compressors[compr->compr_type] = compr;
 211
 212 #ifdef CONFIG_NEEDS_MANUAL_RELOC
 213         ubifs_compressors[compr->compr_type]->name += gd->reloc_off;
 214         ubifs_compressors[compr->compr_type]->capi_name += gd->reloc_off;
 215         ubifs_compressors[compr->compr_type]->decompress += gd->reloc_off;
 216 #endif
 217
 218         if (compr->capi_name) {
 219                 compr->cc = crypto_alloc_comp(compr->capi_name, 0, 0);
 220                 if (IS_ERR(compr->cc)) {
 221                         dbg_gen("cannot initialize compressor %s,"
 222                                   " error %ld", compr->name,
 223                                   PTR_ERR(compr->cc));
 224                         return PTR_ERR(compr->cc);
 225                 }
 226         }
 227
 228         return 0;
 229 }
 230
 231 /**
 232  * ubifs_compressors_init - initialize UBIFS compressors.
 233  *
 234  * This function initializes the compressor which were compiled in. Returns
 235  * zero in case of success and a negative error code in case of failure.
 236  */
 237 int __init ubifs_compressors_init(void)
 238 {
 239         int err;
 240
 241         err = compr_init(&lzo_compr);
 242         if (err)
 243                 return err;
 244
 245         err = compr_init(&zlib_compr);
 246         if (err)
 247                 return err;
 248
 249         err = compr_init(&none_compr);
 250         if (err)
 251                 return err;
 252
 253         return 0;
 254 }
 255
 256 /*
 257  * ubifsls...
 258  */
 259
 260 static int filldir(struct ubifs_info *c, const char *name, int namlen,
 261                    u64 ino, unsigned int d_type)
 262 {
 263         struct inode *inode;
 264         char filetime[32];
 265
 266         switch (d_type) {
 267         case UBIFS_ITYPE_REG:
 268                 printf("\t");
 269                 break;
 270         case UBIFS_ITYPE_DIR:
 271                 printf("<DIR>\t");
 272                 break;
 273         case UBIFS_ITYPE_LNK:
 274                 printf("<LNK>\t");
 275                 break;
 276         default:
 277                 printf("other\t");
 278                 break;
 279         }
 280
 281         inode = ubifs_iget(c->vfs_sb, ino);
 282         if (IS_ERR(inode)) {
 283                 printf("%s: Error in ubifs_iget(), ino=%lld ret=%p!\n",
 284                        __func__, ino, inode);
 285                 return -1;
 286         }
 287         ctime_r((time_t *)&inode->i_mtime, filetime);
 288         printf("%9lld  %24.24s  ", inode->i_size, filetime);
 289 #ifndef __UBOOT__
 290         ubifs_iput(inode);
 291 #endif
 292
 293         printf("%s\n", name);
 294
 295         return 0;
 296 }
 297
 298 static int ubifs_printdir(struct file *file, void *dirent)
 299 {
 300         int err, over = 0;
 301         struct qstr nm;
 302         union ubifs_key key;
 303         struct ubifs_dent_node *dent;
 304         struct inode *dir = file->f_path.dentry->d_inode;
 305         struct ubifs_info *c = dir->i_sb->s_fs_info;
 306
 307         dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, file->f_pos);
 308
 309         if (file->f_pos > UBIFS_S_KEY_HASH_MASK || file->f_pos == 2)
 310                 /*
 311                  * The directory was seek'ed to a senseless position or there
 312                  * are no more entries.
 313                  */
 314                 return 0;
 315
 316         if (file->f_pos == 1) {
 317                 /* Find the first entry in TNC and save it */
 318                 lowest_dent_key(c, &key, dir->i_ino);
 319                 nm.name = NULL;
 320                 dent = ubifs_tnc_next_ent(c, &key, &nm);
 321                 if (IS_ERR(dent)) {
 322                         err = PTR_ERR(dent);
 323                         goto out;
 324                 }
 325
 326                 file->f_pos = key_hash_flash(c, &dent->key);
 327                 file->private_data = dent;
 328         }
 329
 330         dent = file->private_data;
 331         if (!dent) {
 332                 /*
 333                  * The directory was seek'ed to and is now readdir'ed.
 334                  * Find the entry corresponding to @file->f_pos or the
 335                  * closest one.
 336                  */
 337                 dent_key_init_hash(c, &key, dir->i_ino, file->f_pos);
 338                 nm.name = NULL;
 339                 dent = ubifs_tnc_next_ent(c, &key, &nm);
 340                 if (IS_ERR(dent)) {
 341                         err = PTR_ERR(dent);
 342                         goto out;
 343                 }
 344                 file->f_pos = key_hash_flash(c, &dent->key);
 345                 file->private_data = dent;
 346         }
 347
 348         while (1) {
 349                 dbg_gen("feed '%s', ino %llu, new f_pos %#x",
 350                         dent->name, (unsigned long long)le64_to_cpu(dent->inum),
 351                         key_hash_flash(c, &dent->key));
 352                 ubifs_assert(le64_to_cpu(dent->ch.sqnum) > ubifs_inode(dir)->creat_sqnum);
 353
 354                 nm.len = le16_to_cpu(dent->nlen);
 355                 over = filldir(c, (char *)dent->name, nm.len,
 356                                le64_to_cpu(dent->inum), dent->type);
 357                 if (over)
 358                         return 0;
 359
 360                 /* Switch to the next entry */
 361                 key_read(c, &dent->key, &key);
 362                 nm.name = (char *)dent->name;
 363                 dent = ubifs_tnc_next_ent(c, &key, &nm);
 364                 if (IS_ERR(dent)) {
 365                         err = PTR_ERR(dent);
 366                         goto out;
 367                 }
 368
 369                 kfree(file->private_data);
 370                 file->f_pos = key_hash_flash(c, &dent->key);
 371                 file->private_data = dent;
 372                 cond_resched();
 373         }
 374
 375 out:
 376         if (err != -ENOENT) {
 377                 ubifs_err(c, "cannot find next direntry, error %d", err);
 378                 return err;
 379         }
 380
 381         kfree(file->private_data);
 382         file->private_data = NULL;
 383         file->f_pos = 2;
 384         return 0;
 385 }
 386
 387 static int ubifs_finddir(struct super_block *sb, char *dirname,
 388                          unsigned long root_inum, unsigned long *inum)
 389 {
 390         int err;
 391         struct qstr nm;
 392         union ubifs_key key;
 393         struct ubifs_dent_node *dent;
 394         struct ubifs_info *c;
 395         struct file *file;
 396         struct dentry *dentry;
 397         struct inode *dir;
 398         int ret = 0;
 399
 400         file = kzalloc(sizeof(struct file), 0);
 401         dentry = kzalloc(sizeof(struct dentry), 0);
 402         dir = kzalloc(sizeof(struct inode), 0);
 403         if (!file || !dentry || !dir) {
 404                 printf("%s: Error, no memory for malloc!\n", __func__);
 405                 err = -ENOMEM;
 406                 goto out;
 407         }
 408
 409         dir->i_sb = sb;
 410         file->f_path.dentry = dentry;
 411         file->f_path.dentry->d_parent = dentry;
 412         file->f_path.dentry->d_inode = dir;
 413         file->f_path.dentry->d_inode->i_ino = root_inum;
 414         c = sb->s_fs_info;
 415
 416         dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, file->f_pos);
 417
 418         /* Find the first entry in TNC and save it */
 419         lowest_dent_key(c, &key, dir->i_ino);
 420         nm.name = NULL;
 421         dent = ubifs_tnc_next_ent(c, &key, &nm);
 422         if (IS_ERR(dent)) {
 423                 err = PTR_ERR(dent);
 424                 goto out;
 425         }
 426
 427         file->f_pos = key_hash_flash(c, &dent->key);
 428         file->private_data = dent;
 429
 430         while (1) {
 431                 dbg_gen("feed '%s', ino %llu, new f_pos %#x",
 432                         dent->name, (unsigned long long)le64_to_cpu(dent->inum),
 433                         key_hash_flash(c, &dent->key));
 434                 ubifs_assert(le64_to_cpu(dent->ch.sqnum) > ubifs_inode(dir)->creat_sqnum);
 435
 436                 nm.len = le16_to_cpu(dent->nlen);
 437                 if ((strncmp(dirname, (char *)dent->name, nm.len) == 0) &&
 438                     (strlen(dirname) == nm.len)) {
 439                         *inum = le64_to_cpu(dent->inum);
 440                         ret = 1;
 441                         goto out_free;
 442                 }
 443
 444                 /* Switch to the next entry */
 445                 key_read(c, &dent->key, &key);
 446                 nm.name = (char *)dent->name;
 447                 dent = ubifs_tnc_next_ent(c, &key, &nm);
 448                 if (IS_ERR(dent)) {
 449                         err = PTR_ERR(dent);
 450                         goto out;
 451                 }
 452
 453                 kfree(file->private_data);
 454                 file->f_pos = key_hash_flash(c, &dent->key);
 455                 file->private_data = dent;
 456                 cond_resched();
 457         }
 458
 459 out:
 460         if (err != -ENOENT)
 461                 dbg_gen("cannot find next direntry, error %d", err);
 462
 463 out_free:
 464         kfree(file->private_data);
 465         free(file);
 466         free(dentry);
 467         free(dir);
 468
 469         return ret;
 470 }
 471
 472 static unsigned long ubifs_findfile(struct super_block *sb, char *filename)
 473 {
 474         int ret;
 475         char *next;
 476         char fpath[128];
 477         char symlinkpath[128];
 478         char *name = fpath;
 479         unsigned long root_inum = 1;
 480         unsigned long inum;
 481         int symlink_count = 0; /* Don't allow symlink recursion */
 482         char link_name[64];
 483
 484         strcpy(fpath, filename);
 485
 486         /* Remove all leading slashes */
 487         while (*name == '/')
 488                 name++;
 489
 490         /*
 491          * Handle root-direcoty ('/')
 492          */
 493         inum = root_inum;
 494         if (!name || *name == '\0')
 495                 return inum;
 496
 497         for (;;) {
 498                 struct inode *inode;
 499                 struct ubifs_inode *ui;
 500
 501                 /* Extract the actual part from the pathname.  */
 502                 next = strchr(name, '/');
 503                 if (next) {
 504                         /* Remove all leading slashes.  */
 505                         while (*next == '/')
 506                                 *(next++) = '\0';
 507                 }
 508
 509                 ret = ubifs_finddir(sb, name, root_inum, &inum);
 510                 if (!ret)
 511                         return 0;
 512                 inode = ubifs_iget(sb, inum);
 513
 514                 if (!inode)
 515                         return 0;
 516                 ui = ubifs_inode(inode);
 517
 518                 if ((inode->i_mode & S_IFMT) == S_IFLNK) {
 519                         char buf[128];
 520
 521                         /* We have some sort of symlink recursion, bail out */
 522                         if (symlink_count++ > 8) {
 523                                 printf("Symlink recursion, aborting\n");
 524                                 return 0;
 525                         }
 526                         memcpy(link_name, ui->data, ui->data_len);
 527                         link_name[ui->data_len] = '\0';
 528
 529                         if (link_name[0] == '/') {
 530                                 /* Absolute path, redo everything without
 531                                  * the leading slash */
 532                                 next = name = link_name + 1;
 533                                 root_inum = 1;
 534                                 continue;
 535                         }
 536                         /* Relative to cur dir */
 537                         sprintf(buf, "%s/%s",
 538                                         link_name, next == NULL ? "" : next);
 539                         memcpy(symlinkpath, buf, sizeof(buf));
 540                         next = name = symlinkpath;
 541                         continue;
 542                 }
 543
 544                 /*
 545                  * Check if directory with this name exists
 546                  */
 547
 548                 /* Found the node!  */
 549                 if (!next || *next == '\0')
 550                         return inum;
 551
 552                 root_inum = inum;
 553                 name = next;
 554         }
 555
 556         return 0;
 557 }
 558
 559 int ubifs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info)
 560 {
 561         if (rbdd) {
 562                 debug("UBIFS cannot be used with normal block devices\n");
 563                 return -1;
 564         }
 565
 566         /*
 567          * Should never happen since blk_get_device_part_str() already checks
 568          * this, but better safe then sorry.
 569          */
 570         if (!ubifs_is_mounted()) {
 571                 debug("UBIFS not mounted, use ubifsmount to mount volume first!\n");
 572                 return -1;
 573         }
 574
 575         return 0;
 576 }
 577
 578 int ubifs_ls(const char *filename)
 579 {
 580         struct ubifs_info *c = ubifs_sb->s_fs_info;
 581         struct file *file;
 582         struct dentry *dentry;
 583         struct inode *dir;
 584         void *dirent = NULL;
 585         unsigned long inum;
 586         int ret = 0;
 587
 588         c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
 589         inum = ubifs_findfile(ubifs_sb, (char *)filename);
 590         if (!inum) {
 591                 ret = -1;
 592                 goto out;
 593         }
 594
 595         file = kzalloc(sizeof(struct file), 0);
 596         dentry = kzalloc(sizeof(struct dentry), 0);
 597         dir = kzalloc(sizeof(struct inode), 0);
 598         if (!file || !dentry || !dir) {
 599                 printf("%s: Error, no memory for malloc!\n", __func__);
 600                 ret = -ENOMEM;
 601                 goto out_mem;
 602         }
 603
 604         dir->i_sb = ubifs_sb;
 605         file->f_path.dentry = dentry;
 606         file->f_path.dentry->d_parent = dentry;
 607         file->f_path.dentry->d_inode = dir;
 608         file->f_path.dentry->d_inode->i_ino = inum;
 609         file->f_pos = 1;
 610         file->private_data = NULL;
 611         ubifs_printdir(file, dirent);
 612
 613 out_mem:
 614         if (file)
 615                 free(file);
 616         if (dentry)
 617                 free(dentry);
 618         if (dir)
 619                 free(dir);
 620
 621 out:
 622         ubi_close_volume(c->ubi);
 623         return ret;
 624 }
 625
 626 int ubifs_exists(const char *filename)
 627 {
 628         struct ubifs_info *c = ubifs_sb->s_fs_info;
 629         unsigned long inum;
 630
 631         c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
 632         inum = ubifs_findfile(ubifs_sb, (char *)filename);
 633         ubi_close_volume(c->ubi);
 634
 635         return inum != 0;
 636 }
 637
 638 int ubifs_size(const char *filename, loff_t *size)
 639 {
 640         struct ubifs_info *c = ubifs_sb->s_fs_info;
 641         unsigned long inum;
 642         struct inode *inode;
 643         int err = 0;
 644
 645         c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
 646
 647         inum = ubifs_findfile(ubifs_sb, (char *)filename);
 648         if (!inum) {
 649                 err = -1;
 650                 goto out;
 651         }
 652
 653         inode = ubifs_iget(ubifs_sb, inum);
 654         if (IS_ERR(inode)) {
 655                 printf("%s: Error reading inode %ld!\n", __func__, inum);
 656                 err = PTR_ERR(inode);
 657                 goto out;
 658         }
 659
 660         *size = inode->i_size;
 661
 662         ubifs_iput(inode);
 663 out:
 664         ubi_close_volume(c->ubi);
 665         return err;
 666 }
 667
 668 /*
 669  * ubifsload...
 670  */
 671
 672 /* file.c */
 673
 674 static inline void *kmap(struct page *page)
 675 {
 676         return page->addr;
 677 }
 678
 679 static int read_block(struct inode *inode, void *addr, unsigned int block,
 680                       struct ubifs_data_node *dn)
 681 {
 682         struct ubifs_info *c = inode->i_sb->s_fs_info;
 683         int err, len, out_len;
 684         union ubifs_key key;
 685         unsigned int dlen;
 686
 687         data_key_init(c, &key, inode->i_ino, block);
 688         err = ubifs_tnc_lookup(c, &key, dn);
 689         if (err) {
 690                 if (err == -ENOENT)
 691                         /* Not found, so it must be a hole */
 692                         memset(addr, 0, UBIFS_BLOCK_SIZE);
 693                 return err;
 694         }
 695
 696         ubifs_assert(le64_to_cpu(dn->ch.sqnum) > ubifs_inode(inode)->creat_sqnum);
 697
 698         len = le32_to_cpu(dn->size);
 699         if (len <= 0 || len > UBIFS_BLOCK_SIZE)
 700                 goto dump;
 701
 702         dlen = le32_to_cpu(dn->ch.len) - UBIFS_DATA_NODE_SZ;
 703         out_len = UBIFS_BLOCK_SIZE;
 704         err = ubifs_decompress(c, &dn->data, dlen, addr, &out_len,
 705                                le16_to_cpu(dn->compr_type));
 706         if (err || len != out_len)
 707                 goto dump;
 708
 709         /*
 710          * Data length can be less than a full block, even for blocks that are
 711          * not the last in the file (e.g., as a result of making a hole and
 712          * appending data). Ensure that the remainder is zeroed out.
 713          */
 714         if (len < UBIFS_BLOCK_SIZE)
 715                 memset(addr + len, 0, UBIFS_BLOCK_SIZE - len);
 716
 717         return 0;
 718
 719 dump:
 720         ubifs_err(c, "bad data node (block %u, inode %lu)",
 721                   block, inode->i_ino);
 722         ubifs_dump_node(c, dn);
 723         return -EINVAL;
 724 }
 725
 726 static int do_readpage(struct ubifs_info *c, struct inode *inode,
 727                        struct page *page, int last_block_size)
 728 {
 729         void *addr;
 730         int err = 0, i;
 731         unsigned int block, beyond;
 732         struct ubifs_data_node *dn;
 733         loff_t i_size = inode->i_size;
 734
 735         dbg_gen("ino %lu, pg %lu, i_size %lld",
 736                 inode->i_ino, page->index, i_size);
 737
 738         addr = kmap(page);
 739
 740         block = page->index << UBIFS_BLOCKS_PER_PAGE_SHIFT;
 741         beyond = (i_size + UBIFS_BLOCK_SIZE - 1) >> UBIFS_BLOCK_SHIFT;
 742         if (block >= beyond) {
 743                 /* Reading beyond inode */
 744                 memset(addr, 0, PAGE_CACHE_SIZE);
 745                 goto out;
 746         }
 747
 748         dn = kmalloc(UBIFS_MAX_DATA_NODE_SZ, GFP_NOFS);
 749         if (!dn)
 750                 return -ENOMEM;
 751
 752         i = 0;
 753         while (1) {
 754                 int ret;
 755
 756                 if (block >= beyond) {
 757                         /* Reading beyond inode */
 758                         err = -ENOENT;
 759                         memset(addr, 0, UBIFS_BLOCK_SIZE);
 760                 } else {
 761                         /*
 762                          * Reading last block? Make sure to not write beyond
 763                          * the requested size in the destination buffer.
 764                          */
 765                         if (((block + 1) == beyond) || last_block_size) {
 766                                 void *buff;
 767                                 int dlen;
 768
 769                                 /*
 770                                  * We need to buffer the data locally for the
 771                                  * last block. This is to not pad the
 772                                  * destination area to a multiple of
 773                                  * UBIFS_BLOCK_SIZE.
 774                                  */
 775                                 buff = malloc_cache_aligned(UBIFS_BLOCK_SIZE);
 776                                 if (!buff) {
 777                                         printf("%s: Error, malloc fails!\n",
 778                                                __func__);
 779                                         err = -ENOMEM;
 780                                         break;
 781                                 }
 782
 783                                 /* Read block-size into temp buffer */
 784                                 ret = read_block(inode, buff, block, dn);
 785                                 if (ret) {
 786                                         err = ret;
 787                                         if (err != -ENOENT) {
 788                                                 free(buff);
 789                                                 break;
 790                                         }
 791                                 }
 792
 793                                 if (last_block_size)
 794                                         dlen = last_block_size;
 795                                 else
 796                                         dlen = le32_to_cpu(dn->size);
 797
 798                                 /* Now copy required size back to dest */
 799                                 memcpy(addr, buff, dlen);
 800
 801                                 free(buff);
 802                         } else {
 803                                 ret = read_block(inode, addr, block, dn);
 804                                 if (ret) {
 805                                         err = ret;
 806                                         if (err != -ENOENT)
 807                                                 break;
 808                                 }
 809                         }
 810                 }
 811                 if (++i >= UBIFS_BLOCKS_PER_PAGE)
 812                         break;
 813                 block += 1;
 814                 addr += UBIFS_BLOCK_SIZE;
 815         }
 816         if (err) {
 817                 if (err == -ENOENT) {
 818                         /* Not found, so it must be a hole */
 819                         dbg_gen("hole");
 820                         goto out_free;
 821                 }
 822                 ubifs_err(c, "cannot read page %lu of inode %lu, error %d",
 823                           page->index, inode->i_ino, err);
 824                 goto error;
 825         }
 826
 827 out_free:
 828         kfree(dn);
 829 out:
 830         return 0;
 831
 832 error:
 833         kfree(dn);
 834         return err;
 835 }
 836
 837 int ubifs_read(const char *filename, void *buf, loff_t offset,
 838                loff_t size, loff_t *actread)
 839 {
 840         struct ubifs_info *c = ubifs_sb->s_fs_info;
 841         unsigned long inum;
 842         struct inode *inode;
 843         struct page page;
 844         int err = 0;
 845         int i;
 846         int count;
 847         int last_block_size = 0;
 848
 849         *actread = 0;
 850
 851         if (offset & (PAGE_SIZE - 1)) {
 852                 printf("ubifs: Error offset must be a multiple of %d\n",
 853                        PAGE_SIZE);
 854                 return -1;
 855         }
 856
 857         c->ubi = ubi_open_volume(c->vi.ubi_num, c->vi.vol_id, UBI_READONLY);
 858         /* ubifs_findfile will resolve symlinks, so we know that we get
 859          * the real file here */
 860         inum = ubifs_findfile(ubifs_sb, (char *)filename);
 861         if (!inum) {
 862                 err = -1;
 863                 goto out;
 864         }
 865
 866         /*
 867          * Read file inode
 868          */
 869         inode = ubifs_iget(ubifs_sb, inum);
 870         if (IS_ERR(inode)) {
 871                 printf("%s: Error reading inode %ld!\n", __func__, inum);
 872                 err = PTR_ERR(inode);
 873                 goto out;
 874         }
 875
 876         if (offset > inode->i_size) {
 877                 printf("ubifs: Error offset (%lld) > file-size (%lld)\n",
 878                        offset, size);
 879                 err = -1;
 880                 goto put_inode;
 881         }
 882
 883         /*
 884          * If no size was specified or if size bigger than filesize
 885          * set size to filesize
 886          */
 887         if ((size == 0) || (size > (inode->i_size - offset)))
 888                 size = inode->i_size - offset;
 889
 890         count = (size + UBIFS_BLOCK_SIZE - 1) >> UBIFS_BLOCK_SHIFT;
 891
 892         page.addr = buf;
 893         page.index = offset / PAGE_SIZE;
 894         page.inode = inode;
 895         for (i = 0; i < count; i++) {
 896                 /*
 897                  * Make sure to not read beyond the requested size
 898                  */
 899                 if (((i + 1) == count) && (size < inode->i_size))
 900                         last_block_size = size - (i * PAGE_SIZE);
 901
 902                 err = do_readpage(c, inode, &page, last_block_size);
 903                 if (err)
 904                         break;
 905
 906                 page.addr += PAGE_SIZE;
 907                 page.index++;
 908         }
 909
 910         if (err) {
 911                 printf("Error reading file '%s'\n", filename);
 912                 *actread = i * PAGE_SIZE;
 913         } else {
 914                 *actread = size;
 915         }
 916
 917 put_inode:
 918         ubifs_iput(inode);
 919
 920 out:
 921         ubi_close_volume(c->ubi);
 922         return err;
 923 }
 924
 925 void ubifs_close(void)
 926 {
 927 }
 928
 929 /* Compat wrappers for common/cmd_ubifs.c */
 930 int ubifs_load(char *filename, u32 addr, u32 size)
 931 {
 932         loff_t actread;
 933         int err;
 934
 935         printf("Loading file '%s' to addr 0x%08x...\n", filename, addr);
 936
 937         err = ubifs_read(filename, (void *)(uintptr_t)addr, 0, size, &actread);
 938         if (err == 0) {
 939                 env_set_hex("filesize", actread);
 940                 printf("Done\n");
 941         }
 942
 943         return err;
 944 }
 945
 946 void uboot_ubifs_umount(void)
 947 {
 948         if (ubifs_sb) {
 949                 printf("Unmounting UBIFS volume %s!\n",
 950                        ((struct ubifs_info *)(ubifs_sb->s_fs_info))->vi.name);
 951                 ubifs_umount(ubifs_sb->s_fs_info);
 952                 ubifs_sb = NULL;
 953         }
 954 }