git.sur5r.net Git - u-boot/blob - fs/ext4/ext4_common.c

   1 /*
   2  * (C) Copyright 2011 - 2012 Samsung Electronics
   3  * EXT4 filesystem implementation in Uboot by
   4  * Uma Shankar <uma.shankar@samsung.com>
   5  * Manjunatha C Achar <a.manjunatha@samsung.com>
   6  *
   7  * ext4ls and ext4load : Based on ext2 ls load support in Uboot.
   8  *
   9  * (C) Copyright 2004
  10  * esd gmbh <www.esd-electronics.com>
  11  * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
  12  *
  13  * based on code from grub2 fs/ext2.c and fs/fshelp.c by
  14  * GRUB  --  GRand Unified Bootloader
  15  * Copyright (C) 2003, 2004  Free Software Foundation, Inc.
  16  *
  17  * ext4write : Based on generic ext4 protocol.
  18  *
  19  * SPDX-License-Identifier:     GPL-2.0+
  20  */
  21
  22 #include <common.h>
  23 #include <ext_common.h>
  24 #include <ext4fs.h>
  25 #include <inttypes.h>
  26 #include <malloc.h>
  27 #include <memalign.h>
  28 #include <stddef.h>
  29 #include <linux/stat.h>
  30 #include <linux/time.h>
  31 #include <asm/byteorder.h>
  32 #include "ext4_common.h"
  33
  34 struct ext2_data *ext4fs_root;
  35 struct ext2fs_node *ext4fs_file;
  36 uint32_t *ext4fs_indir1_block;
  37 int ext4fs_indir1_size;
  38 int ext4fs_indir1_blkno = -1;
  39 uint32_t *ext4fs_indir2_block;
  40 int ext4fs_indir2_size;
  41 int ext4fs_indir2_blkno = -1;
  42
  43 uint32_t *ext4fs_indir3_block;
  44 int ext4fs_indir3_size;
  45 int ext4fs_indir3_blkno = -1;
  46 struct ext2_inode *g_parent_inode;
  47 static int symlinknest;
  48
  49 #if defined(CONFIG_EXT4_WRITE)
  50 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
  51 {
  52         uint32_t res = size / n;
  53         if (res * n != size)
  54                 res++;
  55
  56         return res;
  57 }
  58
  59 void put_ext4(uint64_t off, void *buf, uint32_t size)
  60 {
  61         uint64_t startblock;
  62         uint64_t remainder;
  63         unsigned char *temp_ptr = NULL;
  64         struct ext_filesystem *fs = get_fs();
  65         int log2blksz = fs->dev_desc->log2blksz;
  66         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
  67
  68         startblock = off >> log2blksz;
  69         startblock += part_offset;
  70         remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
  71
  72         if (fs->dev_desc == NULL)
  73                 return;
  74
  75         if ((startblock + (size >> log2blksz)) >
  76             (part_offset + fs->total_sect)) {
  77                 printf("part_offset is " LBAFU "\n", part_offset);
  78                 printf("total_sector is %" PRIu64 "\n", fs->total_sect);
  79                 printf("error: overflow occurs\n");
  80                 return;
  81         }
  82
  83         if (remainder) {
  84                 if (fs->dev_desc->block_read) {
  85                         fs->dev_desc->block_read(fs->dev_desc,
  86                                                  startblock, 1, sec_buf);
  87                         temp_ptr = sec_buf;
  88                         memcpy((temp_ptr + remainder),
  89                                (unsigned char *)buf, size);
  90                         fs->dev_desc->block_write(fs->dev_desc,
  91                                                   startblock, 1, sec_buf);
  92                 }
  93         } else {
  94                 if (size >> log2blksz != 0) {
  95                         fs->dev_desc->block_write(fs->dev_desc,
  96                                                   startblock,
  97                                                   size >> log2blksz,
  98                                                   (unsigned long *)buf);
  99                 } else {
 100                         fs->dev_desc->block_read(fs->dev_desc,
 101                                                  startblock, 1, sec_buf);
 102                         temp_ptr = sec_buf;
 103                         memcpy(temp_ptr, buf, size);
 104                         fs->dev_desc->block_write(fs->dev_desc,
 105                                                   startblock, 1,
 106                                                   (unsigned long *)sec_buf);
 107                 }
 108         }
 109 }
 110
 111 static int _get_new_inode_no(unsigned char *buffer)
 112 {
 113         struct ext_filesystem *fs = get_fs();
 114         unsigned char input;
 115         int operand, status;
 116         int count = 1;
 117         int j = 0;
 118
 119         /* get the blocksize of the filesystem */
 120         unsigned char *ptr = buffer;
 121         while (*ptr == 255) {
 122                 ptr++;
 123                 count += 8;
 124                 if (count > ext4fs_root->sblock.inodes_per_group)
 125                         return -1;
 126         }
 127
 128         for (j = 0; j < fs->blksz; j++) {
 129                 input = *ptr;
 130                 int i = 0;
 131                 while (i <= 7) {
 132                         operand = 1 << i;
 133                         status = input & operand;
 134                         if (status) {
 135                                 i++;
 136                                 count++;
 137                         } else {
 138                                 *ptr |= operand;
 139                                 return count;
 140                         }
 141                 }
 142                 ptr = ptr + 1;
 143         }
 144
 145         return -1;
 146 }
 147
 148 static int _get_new_blk_no(unsigned char *buffer)
 149 {
 150         unsigned char input;
 151         int operand, status;
 152         int count = 0;
 153         int j = 0;
 154         unsigned char *ptr = buffer;
 155         struct ext_filesystem *fs = get_fs();
 156
 157         if (fs->blksz != 1024)
 158                 count = 0;
 159         else
 160                 count = 1;
 161
 162         while (*ptr == 255) {
 163                 ptr++;
 164                 count += 8;
 165                 if (count == (fs->blksz * 8))
 166                         return -1;
 167         }
 168
 169         for (j = 0; j < fs->blksz; j++) {
 170                 input = *ptr;
 171                 int i = 0;
 172                 while (i <= 7) {
 173                         operand = 1 << i;
 174                         status = input & operand;
 175                         if (status) {
 176                                 i++;
 177                                 count++;
 178                         } else {
 179                                 *ptr |= operand;
 180                                 return count;
 181                         }
 182                 }
 183                 ptr = ptr + 1;
 184         }
 185
 186         return -1;
 187 }
 188
 189 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
 190 {
 191         int i, remainder, status;
 192         unsigned char *ptr = buffer;
 193         unsigned char operand;
 194         i = blockno / 8;
 195         remainder = blockno % 8;
 196         int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
 197
 198         i = i - (index * blocksize);
 199         if (blocksize != 1024) {
 200                 ptr = ptr + i;
 201                 operand = 1 << remainder;
 202                 status = *ptr & operand;
 203                 if (status)
 204                         return -1;
 205
 206                 *ptr = *ptr | operand;
 207                 return 0;
 208         } else {
 209                 if (remainder == 0) {
 210                         ptr = ptr + i - 1;
 211                         operand = (1 << 7);
 212                 } else {
 213                         ptr = ptr + i;
 214                         operand = (1 << (remainder - 1));
 215                 }
 216                 status = *ptr & operand;
 217                 if (status)
 218                         return -1;
 219
 220                 *ptr = *ptr | operand;
 221                 return 0;
 222         }
 223 }
 224
 225 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
 226 {
 227         int i, remainder, status;
 228         unsigned char *ptr = buffer;
 229         unsigned char operand;
 230         i = blockno / 8;
 231         remainder = blockno % 8;
 232         int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
 233
 234         i = i - (index * blocksize);
 235         if (blocksize != 1024) {
 236                 ptr = ptr + i;
 237                 operand = (1 << remainder);
 238                 status = *ptr & operand;
 239                 if (status)
 240                         *ptr = *ptr & ~(operand);
 241         } else {
 242                 if (remainder == 0) {
 243                         ptr = ptr + i - 1;
 244                         operand = (1 << 7);
 245                 } else {
 246                         ptr = ptr + i;
 247                         operand = (1 << (remainder - 1));
 248                 }
 249                 status = *ptr & operand;
 250                 if (status)
 251                         *ptr = *ptr & ~(operand);
 252         }
 253 }
 254
 255 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
 256 {
 257         int i, remainder, status;
 258         unsigned char *ptr = buffer;
 259         unsigned char operand;
 260
 261         inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
 262         i = inode_no / 8;
 263         remainder = inode_no % 8;
 264         if (remainder == 0) {
 265                 ptr = ptr + i - 1;
 266                 operand = (1 << 7);
 267         } else {
 268                 ptr = ptr + i;
 269                 operand = (1 << (remainder - 1));
 270         }
 271         status = *ptr & operand;
 272         if (status)
 273                 return -1;
 274
 275         *ptr = *ptr | operand;
 276
 277         return 0;
 278 }
 279
 280 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
 281 {
 282         int i, remainder, status;
 283         unsigned char *ptr = buffer;
 284         unsigned char operand;
 285
 286         inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
 287         i = inode_no / 8;
 288         remainder = inode_no % 8;
 289         if (remainder == 0) {
 290                 ptr = ptr + i - 1;
 291                 operand = (1 << 7);
 292         } else {
 293                 ptr = ptr + i;
 294                 operand = (1 << (remainder - 1));
 295         }
 296         status = *ptr & operand;
 297         if (status)
 298                 *ptr = *ptr & ~(operand);
 299 }
 300
 301 int ext4fs_checksum_update(unsigned int i)
 302 {
 303         struct ext2_block_group *desc;
 304         struct ext_filesystem *fs = get_fs();
 305         __u16 crc = 0;
 306
 307         desc = (struct ext2_block_group *)&fs->bgd[i];
 308         if (fs->sb->feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
 309                 int offset = offsetof(struct ext2_block_group, bg_checksum);
 310
 311                 crc = ext2fs_crc16(~0, fs->sb->unique_id,
 312                                    sizeof(fs->sb->unique_id));
 313                 crc = ext2fs_crc16(crc, &i, sizeof(i));
 314                 crc = ext2fs_crc16(crc, desc, offset);
 315                 offset += sizeof(desc->bg_checksum);    /* skip checksum */
 316                 assert(offset == sizeof(*desc));
 317         }
 318
 319         return crc;
 320 }
 321
 322 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
 323 {
 324         int dentry_length;
 325         int sizeof_void_space;
 326         int new_entry_byte_reqd;
 327         short padding_factor = 0;
 328
 329         if (dir->namelen % 4 != 0)
 330                 padding_factor = 4 - (dir->namelen % 4);
 331
 332         dentry_length = sizeof(struct ext2_dirent) +
 333                         dir->namelen + padding_factor;
 334         sizeof_void_space = dir->direntlen - dentry_length;
 335         if (sizeof_void_space == 0)
 336                 return 0;
 337
 338         padding_factor = 0;
 339         if (strlen(filename) % 4 != 0)
 340                 padding_factor = 4 - (strlen(filename) % 4);
 341
 342         new_entry_byte_reqd = strlen(filename) +
 343             sizeof(struct ext2_dirent) + padding_factor;
 344         if (sizeof_void_space >= new_entry_byte_reqd) {
 345                 dir->direntlen = dentry_length;
 346                 return sizeof_void_space;
 347         }
 348
 349         return 0;
 350 }
 351
 352 void ext4fs_update_parent_dentry(char *filename, int *p_ino, int file_type)
 353 {
 354         unsigned int *zero_buffer = NULL;
 355         char *root_first_block_buffer = NULL;
 356         int direct_blk_idx;
 357         long int root_blknr;
 358         long int first_block_no_of_root = 0;
 359         long int previous_blknr = -1;
 360         int totalbytes = 0;
 361         short int padding_factor = 0;
 362         unsigned int new_entry_byte_reqd;
 363         unsigned int last_entry_dirlen;
 364         int sizeof_void_space = 0;
 365         int templength = 0;
 366         int inodeno;
 367         int status;
 368         struct ext_filesystem *fs = get_fs();
 369         /* directory entry */
 370         struct ext2_dirent *dir;
 371         char *temp_dir = NULL;
 372
 373         zero_buffer = zalloc(fs->blksz);
 374         if (!zero_buffer) {
 375                 printf("No Memory\n");
 376                 return;
 377         }
 378         root_first_block_buffer = zalloc(fs->blksz);
 379         if (!root_first_block_buffer) {
 380                 free(zero_buffer);
 381                 printf("No Memory\n");
 382                 return;
 383         }
 384 restart:
 385
 386         /* read the block no allocated to a file */
 387         for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
 388              direct_blk_idx++) {
 389                 root_blknr = read_allocated_block(g_parent_inode,
 390                                                   direct_blk_idx);
 391                 if (root_blknr == 0) {
 392                         first_block_no_of_root = previous_blknr;
 393                         break;
 394                 }
 395                 previous_blknr = root_blknr;
 396         }
 397
 398         status = ext4fs_devread((lbaint_t)first_block_no_of_root
 399                                 * fs->sect_perblk,
 400                                 0, fs->blksz, root_first_block_buffer);
 401         if (status == 0)
 402                 goto fail;
 403
 404         if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
 405                 goto fail;
 406         dir = (struct ext2_dirent *)root_first_block_buffer;
 407         totalbytes = 0;
 408         while (dir->direntlen > 0) {
 409                 /*
 410                  * blocksize-totalbytes because last directory length
 411                  * i.e. dir->direntlen is free availble space in the
 412                  * block that means  it is a last entry of directory
 413                  * entry
 414                  */
 415
 416                 /* traversing the each directory entry */
 417                 if (fs->blksz - totalbytes == dir->direntlen) {
 418                         if (strlen(filename) % 4 != 0)
 419                                 padding_factor = 4 - (strlen(filename) % 4);
 420
 421                         new_entry_byte_reqd = strlen(filename) +
 422                             sizeof(struct ext2_dirent) + padding_factor;
 423                         padding_factor = 0;
 424                         /*
 425                          * update last directory entry length to its
 426                          * length because we are creating new directory
 427                          * entry
 428                          */
 429                         if (dir->namelen % 4 != 0)
 430                                 padding_factor = 4 - (dir->namelen % 4);
 431
 432                         last_entry_dirlen = dir->namelen +
 433                             sizeof(struct ext2_dirent) + padding_factor;
 434                         if ((fs->blksz - totalbytes - last_entry_dirlen) <
 435                                 new_entry_byte_reqd) {
 436                                 printf("1st Block Full:Allocate new block\n");
 437
 438                                 if (direct_blk_idx == INDIRECT_BLOCKS - 1) {
 439                                         printf("Directory exceeds limit\n");
 440                                         goto fail;
 441                                 }
 442                                 g_parent_inode->b.blocks.dir_blocks
 443                                     [direct_blk_idx] = ext4fs_get_new_blk_no();
 444                                 if (g_parent_inode->b.blocks.dir_blocks
 445                                         [direct_blk_idx] == -1) {
 446                                         printf("no block left to assign\n");
 447                                         goto fail;
 448                                 }
 449                                 put_ext4(((uint64_t)
 450                                           ((uint64_t)g_parent_inode->b.
 451                                            blocks.dir_blocks[direct_blk_idx] *
 452                                            (uint64_t)fs->blksz)), zero_buffer, fs->blksz);
 453                                 g_parent_inode->size =
 454                                     g_parent_inode->size + fs->blksz;
 455                                 g_parent_inode->blockcnt =
 456                                     g_parent_inode->blockcnt + fs->sect_perblk;
 457                                 if (ext4fs_put_metadata
 458                                     (root_first_block_buffer,
 459                                      first_block_no_of_root))
 460                                         goto fail;
 461                                 goto restart;
 462                         }
 463                         dir->direntlen = last_entry_dirlen;
 464                         break;
 465                 }
 466
 467                 templength = dir->direntlen;
 468                 totalbytes = totalbytes + templength;
 469                 sizeof_void_space = check_void_in_dentry(dir, filename);
 470                 if (sizeof_void_space)
 471                         break;
 472
 473                 dir = (struct ext2_dirent *)((char *)dir + templength);
 474         }
 475
 476         /* make a pointer ready for creating next directory entry */
 477         templength = dir->direntlen;
 478         totalbytes = totalbytes + templength;
 479         dir = (struct ext2_dirent *)((char *)dir + templength);
 480
 481         /* get the next available inode number */
 482         inodeno = ext4fs_get_new_inode_no();
 483         if (inodeno == -1) {
 484                 printf("no inode left to assign\n");
 485                 goto fail;
 486         }
 487         dir->inode = inodeno;
 488         if (sizeof_void_space)
 489                 dir->direntlen = sizeof_void_space;
 490         else
 491                 dir->direntlen = fs->blksz - totalbytes;
 492
 493         dir->namelen = strlen(filename);
 494         dir->filetype = FILETYPE_REG;   /* regular file */
 495         temp_dir = (char *)dir;
 496         temp_dir = temp_dir + sizeof(struct ext2_dirent);
 497         memcpy(temp_dir, filename, strlen(filename));
 498
 499         *p_ino = inodeno;
 500
 501         /* update or write  the 1st block of root inode */
 502         if (ext4fs_put_metadata(root_first_block_buffer,
 503                                 first_block_no_of_root))
 504                 goto fail;
 505
 506 fail:
 507         free(zero_buffer);
 508         free(root_first_block_buffer);
 509 }
 510
 511 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
 512 {
 513         int status;
 514         int inodeno;
 515         int totalbytes;
 516         int templength;
 517         int direct_blk_idx;
 518         long int blknr;
 519         int found = 0;
 520         char *ptr = NULL;
 521         unsigned char *block_buffer = NULL;
 522         struct ext2_dirent *dir = NULL;
 523         struct ext2_dirent *previous_dir = NULL;
 524         struct ext_filesystem *fs = get_fs();
 525
 526         /* read the block no allocated to a file */
 527         for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
 528                 direct_blk_idx++) {
 529                 blknr = read_allocated_block(parent_inode, direct_blk_idx);
 530                 if (blknr == 0)
 531                         goto fail;
 532
 533                 /* read the blocks of parenet inode */
 534                 block_buffer = zalloc(fs->blksz);
 535                 if (!block_buffer)
 536                         goto fail;
 537
 538                 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
 539                                         0, fs->blksz, (char *)block_buffer);
 540                 if (status == 0)
 541                         goto fail;
 542
 543                 dir = (struct ext2_dirent *)block_buffer;
 544                 ptr = (char *)dir;
 545                 totalbytes = 0;
 546                 while (dir->direntlen >= 0) {
 547                         /*
 548                          * blocksize-totalbytes because last directory
 549                          * length i.e.,*dir->direntlen is free availble
 550                          * space in the block that means
 551                          * it is a last entry of directory entry
 552                          */
 553                         if (strlen(dirname) == dir->namelen) {
 554                                 if (strncmp(dirname, ptr +
 555                                         sizeof(struct ext2_dirent),
 556                                         dir->namelen) == 0) {
 557                                         previous_dir->direntlen +=
 558                                                         dir->direntlen;
 559                                         inodeno = dir->inode;
 560                                         dir->inode = 0;
 561                                         found = 1;
 562                                         break;
 563                                 }
 564                         }
 565
 566                         if (fs->blksz - totalbytes == dir->direntlen)
 567                                 break;
 568
 569                         /* traversing the each directory entry */
 570                         templength = dir->direntlen;
 571                         totalbytes = totalbytes + templength;
 572                         previous_dir = dir;
 573                         dir = (struct ext2_dirent *)((char *)dir + templength);
 574                         ptr = (char *)dir;
 575                 }
 576
 577                 if (found == 1) {
 578                         free(block_buffer);
 579                         block_buffer = NULL;
 580                         return inodeno;
 581                 }
 582
 583                 free(block_buffer);
 584                 block_buffer = NULL;
 585         }
 586
 587 fail:
 588         free(block_buffer);
 589
 590         return -1;
 591 }
 592
 593 static int find_dir_depth(char *dirname)
 594 {
 595         char *token = strtok(dirname, "/");
 596         int count = 0;
 597         while (token != NULL) {
 598                 token = strtok(NULL, "/");
 599                 count++;
 600         }
 601         return count + 1 + 1;
 602         /*
 603          * for example  for string /home/temp
 604          * depth=home(1)+temp(1)+1 extra for NULL;
 605          * so count is 4;
 606          */
 607 }
 608
 609 static int parse_path(char **arr, char *dirname)
 610 {
 611         char *token = strtok(dirname, "/");
 612         int i = 0;
 613
 614         /* add root */
 615         arr[i] = zalloc(strlen("/") + 1);
 616         if (!arr[i])
 617                 return -ENOMEM;
 618         memcpy(arr[i++], "/", strlen("/"));
 619
 620         /* add each path entry after root */
 621         while (token != NULL) {
 622                 arr[i] = zalloc(strlen(token) + 1);
 623                 if (!arr[i])
 624                         return -ENOMEM;
 625                 memcpy(arr[i++], token, strlen(token));
 626                 token = strtok(NULL, "/");
 627         }
 628         arr[i] = NULL;
 629
 630         return 0;
 631 }
 632
 633 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
 634 {
 635         if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
 636                 return -1;
 637
 638         return 0;
 639 }
 640
 641 /*
 642  * Function: ext4fs_get_parent_inode_num
 643  * Return Value: inode Number of the parent directory of  file/Directory to be
 644  * created
 645  * dirname : Input parmater, input path name of the file/directory to be created
 646  * dname : Output parameter, to be filled with the name of the directory
 647  * extracted from dirname
 648  */
 649 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
 650 {
 651         int i;
 652         int depth = 0;
 653         int matched_inode_no;
 654         int result_inode_no = -1;
 655         char **ptr = NULL;
 656         char *depth_dirname = NULL;
 657         char *parse_dirname = NULL;
 658         struct ext2_inode *parent_inode = NULL;
 659         struct ext2_inode *first_inode = NULL;
 660         struct ext2_inode temp_inode;
 661
 662         if (*dirname != '/') {
 663                 printf("Please supply Absolute path\n");
 664                 return -1;
 665         }
 666
 667         /* TODO: input validation make equivalent to linux */
 668         depth_dirname = zalloc(strlen(dirname) + 1);
 669         if (!depth_dirname)
 670                 return -ENOMEM;
 671
 672         memcpy(depth_dirname, dirname, strlen(dirname));
 673         depth = find_dir_depth(depth_dirname);
 674         parse_dirname = zalloc(strlen(dirname) + 1);
 675         if (!parse_dirname)
 676                 goto fail;
 677         memcpy(parse_dirname, dirname, strlen(dirname));
 678
 679         /* allocate memory for each directory level */
 680         ptr = zalloc((depth) * sizeof(char *));
 681         if (!ptr)
 682                 goto fail;
 683         if (parse_path(ptr, parse_dirname))
 684                 goto fail;
 685         parent_inode = zalloc(sizeof(struct ext2_inode));
 686         if (!parent_inode)
 687                 goto fail;
 688         first_inode = zalloc(sizeof(struct ext2_inode));
 689         if (!first_inode)
 690                 goto fail;
 691         memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
 692         memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
 693         if (flags & F_FILE)
 694                 result_inode_no = EXT2_ROOT_INO;
 695         for (i = 1; i < depth; i++) {
 696                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 697                 if (matched_inode_no == -1) {
 698                         if (ptr[i + 1] == NULL && i == 1) {
 699                                 result_inode_no = EXT2_ROOT_INO;
 700                                 goto end;
 701                         } else {
 702                                 if (ptr[i + 1] == NULL)
 703                                         break;
 704                                 printf("Invalid path\n");
 705                                 result_inode_no = -1;
 706                                 goto fail;
 707                         }
 708                 } else {
 709                         if (ptr[i + 1] != NULL) {
 710                                 memset(parent_inode, '\0',
 711                                        sizeof(struct ext2_inode));
 712                                 if (ext4fs_iget(matched_inode_no,
 713                                                 parent_inode)) {
 714                                         result_inode_no = -1;
 715                                         goto fail;
 716                                 }
 717                                 result_inode_no = matched_inode_no;
 718                         } else {
 719                                 break;
 720                         }
 721                 }
 722         }
 723
 724 end:
 725         if (i == 1)
 726                 matched_inode_no = search_dir(first_inode, ptr[i]);
 727         else
 728                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 729
 730         if (matched_inode_no != -1) {
 731                 ext4fs_iget(matched_inode_no, &temp_inode);
 732                 if (temp_inode.mode & S_IFDIR) {
 733                         printf("It is a Directory\n");
 734                         result_inode_no = -1;
 735                         goto fail;
 736                 }
 737         }
 738
 739         if (strlen(ptr[i]) > 256) {
 740                 result_inode_no = -1;
 741                 goto fail;
 742         }
 743         memcpy(dname, ptr[i], strlen(ptr[i]));
 744
 745 fail:
 746         free(depth_dirname);
 747         free(parse_dirname);
 748         for (i = 0; i < depth; i++) {
 749                 if (!ptr[i])
 750                         break;
 751                 free(ptr[i]);
 752         }
 753         free(ptr);
 754         free(parent_inode);
 755         free(first_inode);
 756
 757         return result_inode_no;
 758 }
 759
 760 static int check_filename(char *filename, unsigned int blknr)
 761 {
 762         unsigned int first_block_no_of_root;
 763         int totalbytes = 0;
 764         int templength = 0;
 765         int status, inodeno;
 766         int found = 0;
 767         char *root_first_block_buffer = NULL;
 768         char *root_first_block_addr = NULL;
 769         struct ext2_dirent *dir = NULL;
 770         struct ext2_dirent *previous_dir = NULL;
 771         char *ptr = NULL;
 772         struct ext_filesystem *fs = get_fs();
 773         int ret = -1;
 774
 775         /* get the first block of root */
 776         first_block_no_of_root = blknr;
 777         root_first_block_buffer = zalloc(fs->blksz);
 778         if (!root_first_block_buffer)
 779                 return -ENOMEM;
 780         root_first_block_addr = root_first_block_buffer;
 781         status = ext4fs_devread((lbaint_t)first_block_no_of_root *
 782                                 fs->sect_perblk, 0,
 783                                 fs->blksz, root_first_block_buffer);
 784         if (status == 0)
 785                 goto fail;
 786
 787         if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
 788                 goto fail;
 789         dir = (struct ext2_dirent *)root_first_block_buffer;
 790         ptr = (char *)dir;
 791         totalbytes = 0;
 792         while (dir->direntlen >= 0) {
 793                 /*
 794                  * blocksize-totalbytes because last
 795                  * directory length i.e., *dir->direntlen
 796                  * is free availble space in the block that
 797                  * means it is a last entry of directory entry
 798                  */
 799                 if (strlen(filename) == dir->namelen) {
 800                         if (strncmp(filename, ptr + sizeof(struct ext2_dirent),
 801                                 dir->namelen) == 0) {
 802                                 printf("file found deleting\n");
 803                                 previous_dir->direntlen += dir->direntlen;
 804                                 inodeno = dir->inode;
 805                                 dir->inode = 0;
 806                                 found = 1;
 807                                 break;
 808                         }
 809                 }
 810
 811                 if (fs->blksz - totalbytes == dir->direntlen)
 812                         break;
 813
 814                 /* traversing the each directory entry */
 815                 templength = dir->direntlen;
 816                 totalbytes = totalbytes + templength;
 817                 previous_dir = dir;
 818                 dir = (struct ext2_dirent *)((char *)dir + templength);
 819                 ptr = (char *)dir;
 820         }
 821
 822
 823         if (found == 1) {
 824                 if (ext4fs_put_metadata(root_first_block_addr,
 825                                         first_block_no_of_root))
 826                         goto fail;
 827                 ret = inodeno;
 828         }
 829 fail:
 830         free(root_first_block_buffer);
 831
 832         return ret;
 833 }
 834
 835 int ext4fs_filename_check(char *filename)
 836 {
 837         short direct_blk_idx = 0;
 838         long int blknr = -1;
 839         int inodeno = -1;
 840
 841         /* read the block no allocated to a file */
 842         for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
 843                 direct_blk_idx++) {
 844                 blknr = read_allocated_block(g_parent_inode, direct_blk_idx);
 845                 if (blknr == 0)
 846                         break;
 847                 inodeno = check_filename(filename, blknr);
 848                 if (inodeno != -1)
 849                         return inodeno;
 850         }
 851
 852         return -1;
 853 }
 854
 855 long int ext4fs_get_new_blk_no(void)
 856 {
 857         short i;
 858         short status;
 859         int remainder;
 860         unsigned int bg_idx;
 861         static int prev_bg_bitmap_index = -1;
 862         unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
 863         struct ext_filesystem *fs = get_fs();
 864         char *journal_buffer = zalloc(fs->blksz);
 865         char *zero_buffer = zalloc(fs->blksz);
 866         if (!journal_buffer || !zero_buffer)
 867                 goto fail;
 868         struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
 869
 870         if (fs->first_pass_bbmap == 0) {
 871                 for (i = 0; i < fs->no_blkgrp; i++) {
 872                         if (bgd[i].free_blocks) {
 873                                 if (bgd[i].bg_flags & EXT4_BG_BLOCK_UNINIT) {
 874                                         put_ext4(((uint64_t) ((uint64_t)bgd[i].block_id *
 875                                                               (uint64_t)fs->blksz)),
 876                                                  zero_buffer, fs->blksz);
 877                                         bgd[i].bg_flags =
 878                                             bgd[i].
 879                                             bg_flags & ~EXT4_BG_BLOCK_UNINIT;
 880                                         memcpy(fs->blk_bmaps[i], zero_buffer,
 881                                                fs->blksz);
 882                                 }
 883                                 fs->curr_blkno =
 884                                     _get_new_blk_no(fs->blk_bmaps[i]);
 885                                 if (fs->curr_blkno == -1)
 886                                         /* if block bitmap is completely fill */
 887                                         continue;
 888                                 fs->curr_blkno = fs->curr_blkno +
 889                                                 (i * fs->blksz * 8);
 890                                 fs->first_pass_bbmap++;
 891                                 bgd[i].free_blocks--;
 892                                 fs->sb->free_blocks--;
 893                                 status = ext4fs_devread((lbaint_t)
 894                                                         bgd[i].block_id *
 895                                                         fs->sect_perblk, 0,
 896                                                         fs->blksz,
 897                                                         journal_buffer);
 898                                 if (status == 0)
 899                                         goto fail;
 900                                 if (ext4fs_log_journal(journal_buffer,
 901                                                         bgd[i].block_id))
 902                                         goto fail;
 903                                 goto success;
 904                         } else {
 905                                 debug("no space left on block group %d\n", i);
 906                         }
 907                 }
 908
 909                 goto fail;
 910         } else {
 911 restart:
 912                 fs->curr_blkno++;
 913                 /* get the blockbitmap index respective to blockno */
 914                 bg_idx = fs->curr_blkno / blk_per_grp;
 915                 if (fs->blksz == 1024) {
 916                         remainder = fs->curr_blkno % blk_per_grp;
 917                         if (!remainder)
 918                                 bg_idx--;
 919                 }
 920
 921                 /*
 922                  * To skip completely filled block group bitmaps
 923                  * Optimize the block allocation
 924                  */
 925                 if (bg_idx >= fs->no_blkgrp)
 926                         goto fail;
 927
 928                 if (bgd[bg_idx].free_blocks == 0) {
 929                         debug("block group %u is full. Skipping\n", bg_idx);
 930                         fs->curr_blkno = fs->curr_blkno + blk_per_grp;
 931                         fs->curr_blkno--;
 932                         goto restart;
 933                 }
 934
 935                 if (bgd[bg_idx].bg_flags & EXT4_BG_BLOCK_UNINIT) {
 936                         memset(zero_buffer, '\0', fs->blksz);
 937                         put_ext4(((uint64_t) ((uint64_t)bgd[bg_idx].block_id *
 938                                         (uint64_t)fs->blksz)), zero_buffer, fs->blksz);
 939                         memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
 940                         bgd[bg_idx].bg_flags = bgd[bg_idx].bg_flags &
 941                                                 ~EXT4_BG_BLOCK_UNINIT;
 942                 }
 943
 944                 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
 945                                    bg_idx) != 0) {
 946                         debug("going for restart for the block no %ld %u\n",
 947                               fs->curr_blkno, bg_idx);
 948                         goto restart;
 949                 }
 950
 951                 /* journal backup */
 952                 if (prev_bg_bitmap_index != bg_idx) {
 953                         memset(journal_buffer, '\0', fs->blksz);
 954                         status = ext4fs_devread((lbaint_t)bgd[bg_idx].block_id
 955                                                 * fs->sect_perblk,
 956                                                 0, fs->blksz, journal_buffer);
 957                         if (status == 0)
 958                                 goto fail;
 959                         if (ext4fs_log_journal(journal_buffer,
 960                                                 bgd[bg_idx].block_id))
 961                                 goto fail;
 962
 963                         prev_bg_bitmap_index = bg_idx;
 964                 }
 965                 bgd[bg_idx].free_blocks--;
 966                 fs->sb->free_blocks--;
 967                 goto success;
 968         }
 969 success:
 970         free(journal_buffer);
 971         free(zero_buffer);
 972
 973         return fs->curr_blkno;
 974 fail:
 975         free(journal_buffer);
 976         free(zero_buffer);
 977
 978         return -1;
 979 }
 980
 981 int ext4fs_get_new_inode_no(void)
 982 {
 983         short i;
 984         short status;
 985         unsigned int ibmap_idx;
 986         static int prev_inode_bitmap_index = -1;
 987         unsigned int inodes_per_grp = ext4fs_root->sblock.inodes_per_group;
 988         struct ext_filesystem *fs = get_fs();
 989         char *journal_buffer = zalloc(fs->blksz);
 990         char *zero_buffer = zalloc(fs->blksz);
 991         if (!journal_buffer || !zero_buffer)
 992                 goto fail;
 993         struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
 994
 995         if (fs->first_pass_ibmap == 0) {
 996                 for (i = 0; i < fs->no_blkgrp; i++) {
 997                         if (bgd[i].free_inodes) {
 998                                 if (bgd[i].bg_itable_unused !=
 999                                                 bgd[i].free_inodes)
1000                                         bgd[i].bg_itable_unused =
1001                                                 bgd[i].free_inodes;
1002                                 if (bgd[i].bg_flags & EXT4_BG_INODE_UNINIT) {
1003                                         put_ext4(((uint64_t)
1004                                                   ((uint64_t)bgd[i].inode_id *
1005                                                         (uint64_t)fs->blksz)),
1006                                                  zero_buffer, fs->blksz);
1007                                         bgd[i].bg_flags = bgd[i].bg_flags &
1008                                                         ~EXT4_BG_INODE_UNINIT;
1009                                         memcpy(fs->inode_bmaps[i],
1010                                                zero_buffer, fs->blksz);
1011                                 }
1012                                 fs->curr_inode_no =
1013                                     _get_new_inode_no(fs->inode_bmaps[i]);
1014                                 if (fs->curr_inode_no == -1)
1015                                         /* if block bitmap is completely fill */
1016                                         continue;
1017                                 fs->curr_inode_no = fs->curr_inode_no +
1018                                                         (i * inodes_per_grp);
1019                                 fs->first_pass_ibmap++;
1020                                 bgd[i].free_inodes--;
1021                                 bgd[i].bg_itable_unused--;
1022                                 fs->sb->free_inodes--;
1023                                 status = ext4fs_devread((lbaint_t)
1024                                                         bgd[i].inode_id *
1025                                                         fs->sect_perblk, 0,
1026                                                         fs->blksz,
1027                                                         journal_buffer);
1028                                 if (status == 0)
1029                                         goto fail;
1030                                 if (ext4fs_log_journal(journal_buffer,
1031                                                         bgd[i].inode_id))
1032                                         goto fail;
1033                                 goto success;
1034                         } else
1035                                 debug("no inode left on block group %d\n", i);
1036                 }
1037                 goto fail;
1038         } else {
1039 restart:
1040                 fs->curr_inode_no++;
1041                 /* get the blockbitmap index respective to blockno */
1042                 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1043                 if (bgd[ibmap_idx].bg_flags & EXT4_BG_INODE_UNINIT) {
1044                         memset(zero_buffer, '\0', fs->blksz);
1045                         put_ext4(((uint64_t) ((uint64_t)bgd[ibmap_idx].inode_id *
1046                                               (uint64_t)fs->blksz)), zero_buffer,
1047                                  fs->blksz);
1048                         bgd[ibmap_idx].bg_flags =
1049                             bgd[ibmap_idx].bg_flags & ~EXT4_BG_INODE_UNINIT;
1050                         memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1051                                 fs->blksz);
1052                 }
1053
1054                 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1055                                           fs->inode_bmaps[ibmap_idx],
1056                                           ibmap_idx) != 0) {
1057                         debug("going for restart for the block no %d %u\n",
1058                               fs->curr_inode_no, ibmap_idx);
1059                         goto restart;
1060                 }
1061
1062                 /* journal backup */
1063                 if (prev_inode_bitmap_index != ibmap_idx) {
1064                         memset(journal_buffer, '\0', fs->blksz);
1065                         status = ext4fs_devread((lbaint_t)
1066                                                 bgd[ibmap_idx].inode_id
1067                                                 * fs->sect_perblk,
1068                                                 0, fs->blksz, journal_buffer);
1069                         if (status == 0)
1070                                 goto fail;
1071                         if (ext4fs_log_journal(journal_buffer,
1072                                                 bgd[ibmap_idx].inode_id))
1073                                 goto fail;
1074                         prev_inode_bitmap_index = ibmap_idx;
1075                 }
1076                 if (bgd[ibmap_idx].bg_itable_unused !=
1077                                 bgd[ibmap_idx].free_inodes)
1078                         bgd[ibmap_idx].bg_itable_unused =
1079                                         bgd[ibmap_idx].free_inodes;
1080                 bgd[ibmap_idx].free_inodes--;
1081                 bgd[ibmap_idx].bg_itable_unused--;
1082                 fs->sb->free_inodes--;
1083                 goto success;
1084         }
1085
1086 success:
1087         free(journal_buffer);
1088         free(zero_buffer);
1089
1090         return fs->curr_inode_no;
1091 fail:
1092         free(journal_buffer);
1093         free(zero_buffer);
1094
1095         return -1;
1096
1097 }
1098
1099
1100 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1101                                         unsigned int *total_remaining_blocks,
1102                                         unsigned int *no_blks_reqd)
1103 {
1104         short i;
1105         short status;
1106         long int actual_block_no;
1107         long int si_blockno;
1108         /* si :single indirect */
1109         unsigned int *si_buffer = NULL;
1110         unsigned int *si_start_addr = NULL;
1111         struct ext_filesystem *fs = get_fs();
1112
1113         if (*total_remaining_blocks != 0) {
1114                 si_buffer = zalloc(fs->blksz);
1115                 if (!si_buffer) {
1116                         printf("No Memory\n");
1117                         return;
1118                 }
1119                 si_start_addr = si_buffer;
1120                 si_blockno = ext4fs_get_new_blk_no();
1121                 if (si_blockno == -1) {
1122                         printf("no block left to assign\n");
1123                         goto fail;
1124                 }
1125                 (*no_blks_reqd)++;
1126                 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1127
1128                 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1129                                         0, fs->blksz, (char *)si_buffer);
1130                 memset(si_buffer, '\0', fs->blksz);
1131                 if (status == 0)
1132                         goto fail;
1133
1134                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1135                         actual_block_no = ext4fs_get_new_blk_no();
1136                         if (actual_block_no == -1) {
1137                                 printf("no block left to assign\n");
1138                                 goto fail;
1139                         }
1140                         *si_buffer = actual_block_no;
1141                         debug("SIAB %u: %u\n", *si_buffer,
1142                                 *total_remaining_blocks);
1143
1144                         si_buffer++;
1145                         (*total_remaining_blocks)--;
1146                         if (*total_remaining_blocks == 0)
1147                                 break;
1148                 }
1149
1150                 /* write the block to disk */
1151                 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1152                          si_start_addr, fs->blksz);
1153                 file_inode->b.blocks.indir_block = si_blockno;
1154         }
1155 fail:
1156         free(si_start_addr);
1157 }
1158
1159 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1160                                         unsigned int *total_remaining_blocks,
1161                                         unsigned int *no_blks_reqd)
1162 {
1163         short i;
1164         short j;
1165         short status;
1166         long int actual_block_no;
1167         /* di:double indirect */
1168         long int di_blockno_parent;
1169         long int di_blockno_child;
1170         unsigned int *di_parent_buffer = NULL;
1171         unsigned int *di_child_buff = NULL;
1172         unsigned int *di_block_start_addr = NULL;
1173         unsigned int *di_child_buff_start = NULL;
1174         struct ext_filesystem *fs = get_fs();
1175
1176         if (*total_remaining_blocks != 0) {
1177                 /* double indirect parent block connecting to inode */
1178                 di_blockno_parent = ext4fs_get_new_blk_no();
1179                 if (di_blockno_parent == -1) {
1180                         printf("no block left to assign\n");
1181                         goto fail;
1182                 }
1183                 di_parent_buffer = zalloc(fs->blksz);
1184                 if (!di_parent_buffer)
1185                         goto fail;
1186
1187                 di_block_start_addr = di_parent_buffer;
1188                 (*no_blks_reqd)++;
1189                 debug("DIPB %ld: %u\n", di_blockno_parent,
1190                       *total_remaining_blocks);
1191
1192                 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1193                                         fs->sect_perblk, 0,
1194                                         fs->blksz, (char *)di_parent_buffer);
1195
1196                 if (!status) {
1197                         printf("%s: Device read error!\n", __func__);
1198                         goto fail;
1199                 }
1200                 memset(di_parent_buffer, '\0', fs->blksz);
1201
1202                 /*
1203                  * start:for each double indirect parent
1204                  * block create one more block
1205                  */
1206                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1207                         di_blockno_child = ext4fs_get_new_blk_no();
1208                         if (di_blockno_child == -1) {
1209                                 printf("no block left to assign\n");
1210                                 goto fail;
1211                         }
1212                         di_child_buff = zalloc(fs->blksz);
1213                         if (!di_child_buff)
1214                                 goto fail;
1215
1216                         di_child_buff_start = di_child_buff;
1217                         *di_parent_buffer = di_blockno_child;
1218                         di_parent_buffer++;
1219                         (*no_blks_reqd)++;
1220                         debug("DICB %ld: %u\n", di_blockno_child,
1221                               *total_remaining_blocks);
1222
1223                         status = ext4fs_devread((lbaint_t)di_blockno_child *
1224                                                 fs->sect_perblk, 0,
1225                                                 fs->blksz,
1226                                                 (char *)di_child_buff);
1227
1228                         if (!status) {
1229                                 printf("%s: Device read error!\n", __func__);
1230                                 goto fail;
1231                         }
1232                         memset(di_child_buff, '\0', fs->blksz);
1233                         /* filling of actual datablocks for each child */
1234                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1235                                 actual_block_no = ext4fs_get_new_blk_no();
1236                                 if (actual_block_no == -1) {
1237                                         printf("no block left to assign\n");
1238                                         goto fail;
1239                                 }
1240                                 *di_child_buff = actual_block_no;
1241                                 debug("DIAB %ld: %u\n", actual_block_no,
1242                                       *total_remaining_blocks);
1243
1244                                 di_child_buff++;
1245                                 (*total_remaining_blocks)--;
1246                                 if (*total_remaining_blocks == 0)
1247                                         break;
1248                         }
1249                         /* write the block  table */
1250                         put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1251                                  di_child_buff_start, fs->blksz);
1252                         free(di_child_buff_start);
1253                         di_child_buff_start = NULL;
1254
1255                         if (*total_remaining_blocks == 0)
1256                                 break;
1257                 }
1258                 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1259                          di_block_start_addr, fs->blksz);
1260                 file_inode->b.blocks.double_indir_block = di_blockno_parent;
1261         }
1262 fail:
1263         free(di_block_start_addr);
1264 }
1265
1266 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1267                                         unsigned int *total_remaining_blocks,
1268                                         unsigned int *no_blks_reqd)
1269 {
1270         short i;
1271         short j;
1272         short k;
1273         long int actual_block_no;
1274         /* ti: Triple Indirect */
1275         long int ti_gp_blockno;
1276         long int ti_parent_blockno;
1277         long int ti_child_blockno;
1278         unsigned int *ti_gp_buff = NULL;
1279         unsigned int *ti_parent_buff = NULL;
1280         unsigned int *ti_child_buff = NULL;
1281         unsigned int *ti_gp_buff_start_addr = NULL;
1282         unsigned int *ti_pbuff_start_addr = NULL;
1283         unsigned int *ti_cbuff_start_addr = NULL;
1284         struct ext_filesystem *fs = get_fs();
1285         if (*total_remaining_blocks != 0) {
1286                 /* triple indirect grand parent block connecting to inode */
1287                 ti_gp_blockno = ext4fs_get_new_blk_no();
1288                 if (ti_gp_blockno == -1) {
1289                         printf("no block left to assign\n");
1290                         goto fail;
1291                 }
1292                 ti_gp_buff = zalloc(fs->blksz);
1293                 if (!ti_gp_buff)
1294                         goto fail;
1295
1296                 ti_gp_buff_start_addr = ti_gp_buff;
1297                 (*no_blks_reqd)++;
1298                 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1299                       *total_remaining_blocks);
1300
1301                 /* for each 4 byte grand parent entry create one more block */
1302                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1303                         ti_parent_blockno = ext4fs_get_new_blk_no();
1304                         if (ti_parent_blockno == -1) {
1305                                 printf("no block left to assign\n");
1306                                 goto fail;
1307                         }
1308                         ti_parent_buff = zalloc(fs->blksz);
1309                         if (!ti_parent_buff)
1310                                 goto fail;
1311
1312                         ti_pbuff_start_addr = ti_parent_buff;
1313                         *ti_gp_buff = ti_parent_blockno;
1314                         ti_gp_buff++;
1315                         (*no_blks_reqd)++;
1316                         debug("TIPB %ld: %u\n", ti_parent_blockno,
1317                               *total_remaining_blocks);
1318
1319                         /* for each 4 byte entry parent create one more block */
1320                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1321                                 ti_child_blockno = ext4fs_get_new_blk_no();
1322                                 if (ti_child_blockno == -1) {
1323                                         printf("no block left assign\n");
1324                                         goto fail;
1325                                 }
1326                                 ti_child_buff = zalloc(fs->blksz);
1327                                 if (!ti_child_buff)
1328                                         goto fail;
1329
1330                                 ti_cbuff_start_addr = ti_child_buff;
1331                                 *ti_parent_buff = ti_child_blockno;
1332                                 ti_parent_buff++;
1333                                 (*no_blks_reqd)++;
1334                                 debug("TICB %ld: %u\n", ti_parent_blockno,
1335                                       *total_remaining_blocks);
1336
1337                                 /* fill actual datablocks for each child */
1338                                 for (k = 0; k < (fs->blksz / sizeof(int));
1339                                         k++) {
1340                                         actual_block_no =
1341                                             ext4fs_get_new_blk_no();
1342                                         if (actual_block_no == -1) {
1343                                                 printf("no block left\n");
1344                                                 goto fail;
1345                                         }
1346                                         *ti_child_buff = actual_block_no;
1347                                         debug("TIAB %ld: %u\n", actual_block_no,
1348                                               *total_remaining_blocks);
1349
1350                                         ti_child_buff++;
1351                                         (*total_remaining_blocks)--;
1352                                         if (*total_remaining_blocks == 0)
1353                                                 break;
1354                                 }
1355                                 /* write the child block */
1356                                 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1357                                                       (uint64_t)fs->blksz)),
1358                                          ti_cbuff_start_addr, fs->blksz);
1359                                 free(ti_cbuff_start_addr);
1360
1361                                 if (*total_remaining_blocks == 0)
1362                                         break;
1363                         }
1364                         /* write the parent block */
1365                         put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1366                                  ti_pbuff_start_addr, fs->blksz);
1367                         free(ti_pbuff_start_addr);
1368
1369                         if (*total_remaining_blocks == 0)
1370                                 break;
1371                 }
1372                 /* write the grand parent block */
1373                 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1374                          ti_gp_buff_start_addr, fs->blksz);
1375                 file_inode->b.blocks.triple_indir_block = ti_gp_blockno;
1376         }
1377 fail:
1378         free(ti_gp_buff_start_addr);
1379 }
1380
1381 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1382                                 unsigned int total_remaining_blocks,
1383                                 unsigned int *total_no_of_block)
1384 {
1385         short i;
1386         long int direct_blockno;
1387         unsigned int no_blks_reqd = 0;
1388
1389         /* allocation of direct blocks */
1390         for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1391                 direct_blockno = ext4fs_get_new_blk_no();
1392                 if (direct_blockno == -1) {
1393                         printf("no block left to assign\n");
1394                         return;
1395                 }
1396                 file_inode->b.blocks.dir_blocks[i] = direct_blockno;
1397                 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1398
1399                 total_remaining_blocks--;
1400         }
1401
1402         alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1403                                     &no_blks_reqd);
1404         alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1405                                     &no_blks_reqd);
1406         alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1407                                     &no_blks_reqd);
1408         *total_no_of_block += no_blks_reqd;
1409 }
1410
1411 #endif
1412
1413 static struct ext4_extent_header *ext4fs_get_extent_block
1414         (struct ext2_data *data, char *buf,
1415                 struct ext4_extent_header *ext_block,
1416                 uint32_t fileblock, int log2_blksz)
1417 {
1418         struct ext4_extent_idx *index;
1419         unsigned long long block;
1420         int blksz = EXT2_BLOCK_SIZE(data);
1421         int i;
1422
1423         while (1) {
1424                 index = (struct ext4_extent_idx *)(ext_block + 1);
1425
1426                 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1427                         return 0;
1428
1429                 if (ext_block->eh_depth == 0)
1430                         return ext_block;
1431                 i = -1;
1432                 do {
1433                         i++;
1434                         if (i >= le16_to_cpu(ext_block->eh_entries))
1435                                 break;
1436                 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1437
1438                 if (--i < 0)
1439                         return 0;
1440
1441                 block = le16_to_cpu(index[i].ei_leaf_hi);
1442                 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1443
1444                 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1445                                    buf))
1446                         ext_block = (struct ext4_extent_header *)buf;
1447                 else
1448                         return 0;
1449         }
1450 }
1451
1452 static int ext4fs_blockgroup
1453         (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1454 {
1455         long int blkno;
1456         unsigned int blkoff, desc_per_blk;
1457         int log2blksz = get_fs()->dev_desc->log2blksz;
1458
1459         desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
1460
1461         blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 +
1462                         group / desc_per_blk;
1463         blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
1464
1465         debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1466               group, blkno, blkoff);
1467
1468         return ext4fs_devread((lbaint_t)blkno <<
1469                               (LOG2_BLOCK_SIZE(data) - log2blksz),
1470                               blkoff, sizeof(struct ext2_block_group),
1471                               (char *)blkgrp);
1472 }
1473
1474 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1475 {
1476         struct ext2_block_group blkgrp;
1477         struct ext2_sblock *sblock = &data->sblock;
1478         struct ext_filesystem *fs = get_fs();
1479         int log2blksz = get_fs()->dev_desc->log2blksz;
1480         int inodes_per_block, status;
1481         long int blkno;
1482         unsigned int blkoff;
1483
1484         /* It is easier to calculate if the first inode is 0. */
1485         ino--;
1486         status = ext4fs_blockgroup(data, ino / __le32_to_cpu
1487                                    (sblock->inodes_per_group), &blkgrp);
1488         if (status == 0)
1489                 return 0;
1490
1491         inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1492         blkno = __le32_to_cpu(blkgrp.inode_table_id) +
1493             (ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1494         blkoff = (ino % inodes_per_block) * fs->inodesz;
1495         /* Read the inode. */
1496         status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1497                                 log2blksz), blkoff,
1498                                 sizeof(struct ext2_inode), (char *)inode);
1499         if (status == 0)
1500                 return 0;
1501
1502         return 1;
1503 }
1504
1505 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1506 {
1507         long int blknr;
1508         int blksz;
1509         int log2_blksz;
1510         int status;
1511         long int rblock;
1512         long int perblock_parent;
1513         long int perblock_child;
1514         unsigned long long start;
1515         /* get the blocksize of the filesystem */
1516         blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1517         log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1518                 - get_fs()->dev_desc->log2blksz;
1519
1520         if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1521                 char *buf = zalloc(blksz);
1522                 if (!buf)
1523                         return -ENOMEM;
1524                 struct ext4_extent_header *ext_block;
1525                 struct ext4_extent *extent;
1526                 int i = -1;
1527                 ext_block =
1528                         ext4fs_get_extent_block(ext4fs_root, buf,
1529                                                 (struct ext4_extent_header *)
1530                                                 inode->b.blocks.dir_blocks,
1531                                                 fileblock, log2_blksz);
1532                 if (!ext_block) {
1533                         printf("invalid extent block\n");
1534                         free(buf);
1535                         return -EINVAL;
1536                 }
1537
1538                 extent = (struct ext4_extent *)(ext_block + 1);
1539
1540                 do {
1541                         i++;
1542                         if (i >= le16_to_cpu(ext_block->eh_entries))
1543                                 break;
1544                 } while (fileblock >= le32_to_cpu(extent[i].ee_block));
1545                 if (--i >= 0) {
1546                         fileblock -= le32_to_cpu(extent[i].ee_block);
1547                         if (fileblock >= le16_to_cpu(extent[i].ee_len)) {
1548                                 free(buf);
1549                                 return 0;
1550                         }
1551
1552                         start = le16_to_cpu(extent[i].ee_start_hi);
1553                         start = (start << 32) +
1554                                         le32_to_cpu(extent[i].ee_start_lo);
1555                         free(buf);
1556                         return fileblock + start;
1557                 }
1558
1559                 printf("Extent Error\n");
1560                 free(buf);
1561                 return -1;
1562         }
1563
1564         /* Direct blocks. */
1565         if (fileblock < INDIRECT_BLOCKS)
1566                 blknr = __le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1567
1568         /* Indirect. */
1569         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1570                 if (ext4fs_indir1_block == NULL) {
1571                         ext4fs_indir1_block = zalloc(blksz);
1572                         if (ext4fs_indir1_block == NULL) {
1573                                 printf("** SI ext2fs read block (indir 1)"
1574                                         "malloc failed. **\n");
1575                                 return -1;
1576                         }
1577                         ext4fs_indir1_size = blksz;
1578                         ext4fs_indir1_blkno = -1;
1579                 }
1580                 if (blksz != ext4fs_indir1_size) {
1581                         free(ext4fs_indir1_block);
1582                         ext4fs_indir1_block = NULL;
1583                         ext4fs_indir1_size = 0;
1584                         ext4fs_indir1_blkno = -1;
1585                         ext4fs_indir1_block = zalloc(blksz);
1586                         if (ext4fs_indir1_block == NULL) {
1587                                 printf("** SI ext2fs read block (indir 1):"
1588                                         "malloc failed. **\n");
1589                                 return -1;
1590                         }
1591                         ext4fs_indir1_size = blksz;
1592                 }
1593                 if ((__le32_to_cpu(inode->b.blocks.indir_block) <<
1594                      log2_blksz) != ext4fs_indir1_blkno) {
1595                         status =
1596                             ext4fs_devread((lbaint_t)__le32_to_cpu
1597                                            (inode->b.blocks.
1598                                             indir_block) << log2_blksz, 0,
1599                                            blksz, (char *)ext4fs_indir1_block);
1600                         if (status == 0) {
1601                                 printf("** SI ext2fs read block (indir 1)"
1602                                         "failed. **\n");
1603                                 return 0;
1604                         }
1605                         ext4fs_indir1_blkno =
1606                                 __le32_to_cpu(inode->b.blocks.
1607                                                indir_block) << log2_blksz;
1608                 }
1609                 blknr = __le32_to_cpu(ext4fs_indir1_block
1610                                       [fileblock - INDIRECT_BLOCKS]);
1611         }
1612         /* Double indirect. */
1613         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1614                                         (blksz / 4 + 1)))) {
1615
1616                 long int perblock = blksz / 4;
1617                 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1618
1619                 if (ext4fs_indir1_block == NULL) {
1620                         ext4fs_indir1_block = zalloc(blksz);
1621                         if (ext4fs_indir1_block == NULL) {
1622                                 printf("** DI ext2fs read block (indir 2 1)"
1623                                         "malloc failed. **\n");
1624                                 return -1;
1625                         }
1626                         ext4fs_indir1_size = blksz;
1627                         ext4fs_indir1_blkno = -1;
1628                 }
1629                 if (blksz != ext4fs_indir1_size) {
1630                         free(ext4fs_indir1_block);
1631                         ext4fs_indir1_block = NULL;
1632                         ext4fs_indir1_size = 0;
1633                         ext4fs_indir1_blkno = -1;
1634                         ext4fs_indir1_block = zalloc(blksz);
1635                         if (ext4fs_indir1_block == NULL) {
1636                                 printf("** DI ext2fs read block (indir 2 1)"
1637                                         "malloc failed. **\n");
1638                                 return -1;
1639                         }
1640                         ext4fs_indir1_size = blksz;
1641                 }
1642                 if ((__le32_to_cpu(inode->b.blocks.double_indir_block) <<
1643                      log2_blksz) != ext4fs_indir1_blkno) {
1644                         status =
1645                             ext4fs_devread((lbaint_t)__le32_to_cpu
1646                                            (inode->b.blocks.
1647                                             double_indir_block) << log2_blksz,
1648                                            0, blksz,
1649                                            (char *)ext4fs_indir1_block);
1650                         if (status == 0) {
1651                                 printf("** DI ext2fs read block (indir 2 1)"
1652                                         "failed. **\n");
1653                                 return -1;
1654                         }
1655                         ext4fs_indir1_blkno =
1656                             __le32_to_cpu(inode->b.blocks.double_indir_block) <<
1657                             log2_blksz;
1658                 }
1659
1660                 if (ext4fs_indir2_block == NULL) {
1661                         ext4fs_indir2_block = zalloc(blksz);
1662                         if (ext4fs_indir2_block == NULL) {
1663                                 printf("** DI ext2fs read block (indir 2 2)"
1664                                         "malloc failed. **\n");
1665                                 return -1;
1666                         }
1667                         ext4fs_indir2_size = blksz;
1668                         ext4fs_indir2_blkno = -1;
1669                 }
1670                 if (blksz != ext4fs_indir2_size) {
1671                         free(ext4fs_indir2_block);
1672                         ext4fs_indir2_block = NULL;
1673                         ext4fs_indir2_size = 0;
1674                         ext4fs_indir2_blkno = -1;
1675                         ext4fs_indir2_block = zalloc(blksz);
1676                         if (ext4fs_indir2_block == NULL) {
1677                                 printf("** DI ext2fs read block (indir 2 2)"
1678                                         "malloc failed. **\n");
1679                                 return -1;
1680                         }
1681                         ext4fs_indir2_size = blksz;
1682                 }
1683                 if ((__le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1684                      log2_blksz) != ext4fs_indir2_blkno) {
1685                         status = ext4fs_devread((lbaint_t)__le32_to_cpu
1686                                                 (ext4fs_indir1_block
1687                                                  [rblock /
1688                                                   perblock]) << log2_blksz, 0,
1689                                                 blksz,
1690                                                 (char *)ext4fs_indir2_block);
1691                         if (status == 0) {
1692                                 printf("** DI ext2fs read block (indir 2 2)"
1693                                         "failed. **\n");
1694                                 return -1;
1695                         }
1696                         ext4fs_indir2_blkno =
1697                             __le32_to_cpu(ext4fs_indir1_block[rblock
1698                                                               /
1699                                                               perblock]) <<
1700                             log2_blksz;
1701                 }
1702                 blknr = __le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1703         }
1704         /* Tripple indirect. */
1705         else {
1706                 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1707                                       (blksz / 4 * blksz / 4));
1708                 perblock_child = blksz / 4;
1709                 perblock_parent = ((blksz / 4) * (blksz / 4));
1710
1711                 if (ext4fs_indir1_block == NULL) {
1712                         ext4fs_indir1_block = zalloc(blksz);
1713                         if (ext4fs_indir1_block == NULL) {
1714                                 printf("** TI ext2fs read block (indir 2 1)"
1715                                         "malloc failed. **\n");
1716                                 return -1;
1717                         }
1718                         ext4fs_indir1_size = blksz;
1719                         ext4fs_indir1_blkno = -1;
1720                 }
1721                 if (blksz != ext4fs_indir1_size) {
1722                         free(ext4fs_indir1_block);
1723                         ext4fs_indir1_block = NULL;
1724                         ext4fs_indir1_size = 0;
1725                         ext4fs_indir1_blkno = -1;
1726                         ext4fs_indir1_block = zalloc(blksz);
1727                         if (ext4fs_indir1_block == NULL) {
1728                                 printf("** TI ext2fs read block (indir 2 1)"
1729                                         "malloc failed. **\n");
1730                                 return -1;
1731                         }
1732                         ext4fs_indir1_size = blksz;
1733                 }
1734                 if ((__le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1735                      log2_blksz) != ext4fs_indir1_blkno) {
1736                         status = ext4fs_devread
1737                             ((lbaint_t)
1738                              __le32_to_cpu(inode->b.blocks.triple_indir_block)
1739                              << log2_blksz, 0, blksz,
1740                              (char *)ext4fs_indir1_block);
1741                         if (status == 0) {
1742                                 printf("** TI ext2fs read block (indir 2 1)"
1743                                         "failed. **\n");
1744                                 return -1;
1745                         }
1746                         ext4fs_indir1_blkno =
1747                             __le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1748                             log2_blksz;
1749                 }
1750
1751                 if (ext4fs_indir2_block == NULL) {
1752                         ext4fs_indir2_block = zalloc(blksz);
1753                         if (ext4fs_indir2_block == NULL) {
1754                                 printf("** TI ext2fs read block (indir 2 2)"
1755                                         "malloc failed. **\n");
1756                                 return -1;
1757                         }
1758                         ext4fs_indir2_size = blksz;
1759                         ext4fs_indir2_blkno = -1;
1760                 }
1761                 if (blksz != ext4fs_indir2_size) {
1762                         free(ext4fs_indir2_block);
1763                         ext4fs_indir2_block = NULL;
1764                         ext4fs_indir2_size = 0;
1765                         ext4fs_indir2_blkno = -1;
1766                         ext4fs_indir2_block = zalloc(blksz);
1767                         if (ext4fs_indir2_block == NULL) {
1768                                 printf("** TI ext2fs read block (indir 2 2)"
1769                                         "malloc failed. **\n");
1770                                 return -1;
1771                         }
1772                         ext4fs_indir2_size = blksz;
1773                 }
1774                 if ((__le32_to_cpu(ext4fs_indir1_block[rblock /
1775                                                        perblock_parent]) <<
1776                      log2_blksz)
1777                     != ext4fs_indir2_blkno) {
1778                         status = ext4fs_devread((lbaint_t)__le32_to_cpu
1779                                                 (ext4fs_indir1_block
1780                                                  [rblock /
1781                                                   perblock_parent]) <<
1782                                                 log2_blksz, 0, blksz,
1783                                                 (char *)ext4fs_indir2_block);
1784                         if (status == 0) {
1785                                 printf("** TI ext2fs read block (indir 2 2)"
1786                                         "failed. **\n");
1787                                 return -1;
1788                         }
1789                         ext4fs_indir2_blkno =
1790                             __le32_to_cpu(ext4fs_indir1_block[rblock /
1791                                                               perblock_parent])
1792                             << log2_blksz;
1793                 }
1794
1795                 if (ext4fs_indir3_block == NULL) {
1796                         ext4fs_indir3_block = zalloc(blksz);
1797                         if (ext4fs_indir3_block == NULL) {
1798                                 printf("** TI ext2fs read block (indir 2 2)"
1799                                         "malloc failed. **\n");
1800                                 return -1;
1801                         }
1802                         ext4fs_indir3_size = blksz;
1803                         ext4fs_indir3_blkno = -1;
1804                 }
1805                 if (blksz != ext4fs_indir3_size) {
1806                         free(ext4fs_indir3_block);
1807                         ext4fs_indir3_block = NULL;
1808                         ext4fs_indir3_size = 0;
1809                         ext4fs_indir3_blkno = -1;
1810                         ext4fs_indir3_block = zalloc(blksz);
1811                         if (ext4fs_indir3_block == NULL) {
1812                                 printf("** TI ext2fs read block (indir 2 2)"
1813                                         "malloc failed. **\n");
1814                                 return -1;
1815                         }
1816                         ext4fs_indir3_size = blksz;
1817                 }
1818                 if ((__le32_to_cpu(ext4fs_indir2_block[rblock
1819                                                        /
1820                                                        perblock_child]) <<
1821                      log2_blksz) != ext4fs_indir3_blkno) {
1822                         status =
1823                             ext4fs_devread((lbaint_t)__le32_to_cpu
1824                                            (ext4fs_indir2_block
1825                                             [(rblock / perblock_child)
1826                                              % (blksz / 4)]) << log2_blksz, 0,
1827                                            blksz, (char *)ext4fs_indir3_block);
1828                         if (status == 0) {
1829                                 printf("** TI ext2fs read block (indir 2 2)"
1830                                        "failed. **\n");
1831                                 return -1;
1832                         }
1833                         ext4fs_indir3_blkno =
1834                             __le32_to_cpu(ext4fs_indir2_block[(rblock /
1835                                                                perblock_child) %
1836                                                               (blksz /
1837                                                                4)]) <<
1838                             log2_blksz;
1839                 }
1840
1841                 blknr = __le32_to_cpu(ext4fs_indir3_block
1842                                       [rblock % perblock_child]);
1843         }
1844         debug("read_allocated_block %ld\n", blknr);
1845
1846         return blknr;
1847 }
1848
1849 /**
1850  * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1851  *                          global pointers
1852  *
1853  * This function assures that for a file with the same name but different size
1854  * the sequential store on the ext4 filesystem will be correct.
1855  *
1856  * In this function the global data, responsible for internal representation
1857  * of the ext4 data are initialized to the reset state. Without this, during
1858  * replacement of the smaller file with the bigger truncation of new file was
1859  * performed.
1860  */
1861 void ext4fs_reinit_global(void)
1862 {
1863         if (ext4fs_indir1_block != NULL) {
1864                 free(ext4fs_indir1_block);
1865                 ext4fs_indir1_block = NULL;
1866                 ext4fs_indir1_size = 0;
1867                 ext4fs_indir1_blkno = -1;
1868         }
1869         if (ext4fs_indir2_block != NULL) {
1870                 free(ext4fs_indir2_block);
1871                 ext4fs_indir2_block = NULL;
1872                 ext4fs_indir2_size = 0;
1873                 ext4fs_indir2_blkno = -1;
1874         }
1875         if (ext4fs_indir3_block != NULL) {
1876                 free(ext4fs_indir3_block);
1877                 ext4fs_indir3_block = NULL;
1878                 ext4fs_indir3_size = 0;
1879                 ext4fs_indir3_blkno = -1;
1880         }
1881 }
1882 void ext4fs_close(void)
1883 {
1884         if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1885                 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1886                 ext4fs_file = NULL;
1887         }
1888         if (ext4fs_root != NULL) {
1889                 free(ext4fs_root);
1890                 ext4fs_root = NULL;
1891         }
1892
1893         ext4fs_reinit_global();
1894 }
1895
1896 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1897                                 struct ext2fs_node **fnode, int *ftype)
1898 {
1899         unsigned int fpos = 0;
1900         int status;
1901         loff_t actread;
1902         struct ext2fs_node *diro = (struct ext2fs_node *) dir;
1903
1904 #ifdef DEBUG
1905         if (name != NULL)
1906                 printf("Iterate dir %s\n", name);
1907 #endif /* of DEBUG */
1908         if (!diro->inode_read) {
1909                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
1910                 if (status == 0)
1911                         return 0;
1912         }
1913         /* Search the file.  */
1914         while (fpos < __le32_to_cpu(diro->inode.size)) {
1915                 struct ext2_dirent dirent;
1916
1917                 status = ext4fs_read_file(diro, fpos,
1918                                            sizeof(struct ext2_dirent),
1919                                            (char *)&dirent, &actread);
1920                 if (status < 0)
1921                         return 0;
1922
1923                 if (dirent.direntlen == 0) {
1924                         printf("Failed to iterate over directory %s\n", name);
1925                         return 0;
1926                 }
1927
1928                 if (dirent.namelen != 0) {
1929                         char filename[dirent.namelen + 1];
1930                         struct ext2fs_node *fdiro;
1931                         int type = FILETYPE_UNKNOWN;
1932
1933                         status = ext4fs_read_file(diro,
1934                                                   fpos +
1935                                                   sizeof(struct ext2_dirent),
1936                                                   dirent.namelen, filename,
1937                                                   &actread);
1938                         if (status < 0)
1939                                 return 0;
1940
1941                         fdiro = zalloc(sizeof(struct ext2fs_node));
1942                         if (!fdiro)
1943                                 return 0;
1944
1945                         fdiro->data = diro->data;
1946                         fdiro->ino = __le32_to_cpu(dirent.inode);
1947
1948                         filename[dirent.namelen] = '\0';
1949
1950                         if (dirent.filetype != FILETYPE_UNKNOWN) {
1951                                 fdiro->inode_read = 0;
1952
1953                                 if (dirent.filetype == FILETYPE_DIRECTORY)
1954                                         type = FILETYPE_DIRECTORY;
1955                                 else if (dirent.filetype == FILETYPE_SYMLINK)
1956                                         type = FILETYPE_SYMLINK;
1957                                 else if (dirent.filetype == FILETYPE_REG)
1958                                         type = FILETYPE_REG;
1959                         } else {
1960                                 status = ext4fs_read_inode(diro->data,
1961                                                            __le32_to_cpu
1962                                                            (dirent.inode),
1963                                                            &fdiro->inode);
1964                                 if (status == 0) {
1965                                         free(fdiro);
1966                                         return 0;
1967                                 }
1968                                 fdiro->inode_read = 1;
1969
1970                                 if ((__le16_to_cpu(fdiro->inode.mode) &
1971                                      FILETYPE_INO_MASK) ==
1972                                     FILETYPE_INO_DIRECTORY) {
1973                                         type = FILETYPE_DIRECTORY;
1974                                 } else if ((__le16_to_cpu(fdiro->inode.mode)
1975                                             & FILETYPE_INO_MASK) ==
1976                                            FILETYPE_INO_SYMLINK) {
1977                                         type = FILETYPE_SYMLINK;
1978                                 } else if ((__le16_to_cpu(fdiro->inode.mode)
1979                                             & FILETYPE_INO_MASK) ==
1980                                            FILETYPE_INO_REG) {
1981                                         type = FILETYPE_REG;
1982                                 }
1983                         }
1984 #ifdef DEBUG
1985                         printf("iterate >%s<\n", filename);
1986 #endif /* of DEBUG */
1987                         if ((name != NULL) && (fnode != NULL)
1988                             && (ftype != NULL)) {
1989                                 if (strcmp(filename, name) == 0) {
1990                                         *ftype = type;
1991                                         *fnode = fdiro;
1992                                         return 1;
1993                                 }
1994                         } else {
1995                                 if (fdiro->inode_read == 0) {
1996                                         status = ext4fs_read_inode(diro->data,
1997                                                                  __le32_to_cpu(
1998                                                                  dirent.inode),
1999                                                                  &fdiro->inode);
2000                                         if (status == 0) {
2001                                                 free(fdiro);
2002                                                 return 0;
2003                                         }
2004                                         fdiro->inode_read = 1;
2005                                 }
2006                                 switch (type) {
2007                                 case FILETYPE_DIRECTORY:
2008                                         printf("<DIR> ");
2009                                         break;
2010                                 case FILETYPE_SYMLINK:
2011                                         printf("<SYM> ");
2012                                         break;
2013                                 case FILETYPE_REG:
2014                                         printf("      ");
2015                                         break;
2016                                 default:
2017                                         printf("< ? > ");
2018                                         break;
2019                                 }
2020                                 printf("%10u %s\n",
2021                                        __le32_to_cpu(fdiro->inode.size),
2022                                         filename);
2023                         }
2024                         free(fdiro);
2025                 }
2026                 fpos += __le16_to_cpu(dirent.direntlen);
2027         }
2028         return 0;
2029 }
2030
2031 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2032 {
2033         char *symlink;
2034         struct ext2fs_node *diro = node;
2035         int status;
2036         loff_t actread;
2037
2038         if (!diro->inode_read) {
2039                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2040                 if (status == 0)
2041                         return 0;
2042         }
2043         symlink = zalloc(__le32_to_cpu(diro->inode.size) + 1);
2044         if (!symlink)
2045                 return 0;
2046
2047         if (__le32_to_cpu(diro->inode.size) <= 60) {
2048                 strncpy(symlink, diro->inode.b.symlink,
2049                          __le32_to_cpu(diro->inode.size));
2050         } else {
2051                 status = ext4fs_read_file(diro, 0,
2052                                            __le32_to_cpu(diro->inode.size),
2053                                            symlink, &actread);
2054                 if ((status < 0) || (actread == 0)) {
2055                         free(symlink);
2056                         return 0;
2057                 }
2058         }
2059         symlink[__le32_to_cpu(diro->inode.size)] = '\0';
2060         return symlink;
2061 }
2062
2063 static int ext4fs_find_file1(const char *currpath,
2064                              struct ext2fs_node *currroot,
2065                              struct ext2fs_node **currfound, int *foundtype)
2066 {
2067         char fpath[strlen(currpath) + 1];
2068         char *name = fpath;
2069         char *next;
2070         int status;
2071         int type = FILETYPE_DIRECTORY;
2072         struct ext2fs_node *currnode = currroot;
2073         struct ext2fs_node *oldnode = currroot;
2074
2075         strncpy(fpath, currpath, strlen(currpath) + 1);
2076
2077         /* Remove all leading slashes. */
2078         while (*name == '/')
2079                 name++;
2080
2081         if (!*name) {
2082                 *currfound = currnode;
2083                 return 1;
2084         }
2085
2086         for (;;) {
2087                 int found;
2088
2089                 /* Extract the actual part from the pathname. */
2090                 next = strchr(name, '/');
2091                 if (next) {
2092                         /* Remove all leading slashes. */
2093                         while (*next == '/')
2094                                 *(next++) = '\0';
2095                 }
2096
2097                 if (type != FILETYPE_DIRECTORY) {
2098                         ext4fs_free_node(currnode, currroot);
2099                         return 0;
2100                 }
2101
2102                 oldnode = currnode;
2103
2104                 /* Iterate over the directory. */
2105                 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2106                 if (found == 0)
2107                         return 0;
2108
2109                 if (found == -1)
2110                         break;
2111
2112                 /* Read in the symlink and follow it. */
2113                 if (type == FILETYPE_SYMLINK) {
2114                         char *symlink;
2115
2116                         /* Test if the symlink does not loop. */
2117                         if (++symlinknest == 8) {
2118                                 ext4fs_free_node(currnode, currroot);
2119                                 ext4fs_free_node(oldnode, currroot);
2120                                 return 0;
2121                         }
2122
2123                         symlink = ext4fs_read_symlink(currnode);
2124                         ext4fs_free_node(currnode, currroot);
2125
2126                         if (!symlink) {
2127                                 ext4fs_free_node(oldnode, currroot);
2128                                 return 0;
2129                         }
2130
2131                         debug("Got symlink >%s<\n", symlink);
2132
2133                         if (symlink[0] == '/') {
2134                                 ext4fs_free_node(oldnode, currroot);
2135                                 oldnode = &ext4fs_root->diropen;
2136                         }
2137
2138                         /* Lookup the node the symlink points to. */
2139                         status = ext4fs_find_file1(symlink, oldnode,
2140                                                     &currnode, &type);
2141
2142                         free(symlink);
2143
2144                         if (status == 0) {
2145                                 ext4fs_free_node(oldnode, currroot);
2146                                 return 0;
2147                         }
2148                 }
2149
2150                 ext4fs_free_node(oldnode, currroot);
2151
2152                 /* Found the node! */
2153                 if (!next || *next == '\0') {
2154                         *currfound = currnode;
2155                         *foundtype = type;
2156                         return 1;
2157                 }
2158                 name = next;
2159         }
2160         return -1;
2161 }
2162
2163 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2164         struct ext2fs_node **foundnode, int expecttype)
2165 {
2166         int status;
2167         int foundtype = FILETYPE_DIRECTORY;
2168
2169         symlinknest = 0;
2170         if (!path)
2171                 return 0;
2172
2173         status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2174         if (status == 0)
2175                 return 0;
2176
2177         /* Check if the node that was found was of the expected type. */
2178         if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2179                 return 0;
2180         else if ((expecttype == FILETYPE_DIRECTORY)
2181                    && (foundtype != expecttype))
2182                 return 0;
2183
2184         return 1;
2185 }
2186
2187 int ext4fs_open(const char *filename, loff_t *len)
2188 {
2189         struct ext2fs_node *fdiro = NULL;
2190         int status;
2191
2192         if (ext4fs_root == NULL)
2193                 return -1;
2194
2195         ext4fs_file = NULL;
2196         status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2197                                   FILETYPE_REG);
2198         if (status == 0)
2199                 goto fail;
2200
2201         if (!fdiro->inode_read) {
2202                 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2203                                 &fdiro->inode);
2204                 if (status == 0)
2205                         goto fail;
2206         }
2207         *len = __le32_to_cpu(fdiro->inode.size);
2208         ext4fs_file = fdiro;
2209
2210         return 0;
2211 fail:
2212         ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2213
2214         return -1;
2215 }
2216
2217 int ext4fs_mount(unsigned part_length)
2218 {
2219         struct ext2_data *data;
2220         int status;
2221         struct ext_filesystem *fs = get_fs();
2222         data = zalloc(SUPERBLOCK_SIZE);
2223         if (!data)
2224                 return 0;
2225
2226         /* Read the superblock. */
2227         status = ext4_read_superblock((char *)&data->sblock);
2228
2229         if (status == 0)
2230                 goto fail;
2231
2232         /* Make sure this is an ext2 filesystem. */
2233         if (__le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2234                 goto fail;
2235
2236         if (__le32_to_cpu(data->sblock.revision_level == 0))
2237                 fs->inodesz = 128;
2238         else
2239                 fs->inodesz = __le16_to_cpu(data->sblock.inode_size);
2240
2241         debug("EXT2 rev %d, inode_size %d\n",
2242                __le32_to_cpu(data->sblock.revision_level), fs->inodesz);
2243
2244         data->diropen.data = data;
2245         data->diropen.ino = 2;
2246         data->diropen.inode_read = 1;
2247         data->inode = &data->diropen.inode;
2248
2249         status = ext4fs_read_inode(data, 2, data->inode);
2250         if (status == 0)
2251                 goto fail;
2252
2253         ext4fs_root = data;
2254
2255         return 1;
2256 fail:
2257         printf("Failed to mount ext2 filesystem...\n");
2258         free(data);
2259         ext4fs_root = NULL;
2260
2261         return 0;
2262 }