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  * This program is free software; you can redistribute it and/or modify
  20  * it under the terms of the GNU General Public License as published by
  21  * the Free Software Foundation; either version 2 of the License, or
  22  * (at your option) any later version.
  23  *
  24  * This program is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  * GNU General Public License for more details.
  28  *
  29  * You should have received a copy of the GNU General Public License
  30  * along with this program; if not, write to the Free Software
  31  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  32  */
  33
  34 #include <common.h>
  35 #include <ext_common.h>
  36 #include <ext4fs.h>
  37 #include <malloc.h>
  38 #include <stddef.h>
  39 #include <linux/stat.h>
  40 #include <linux/time.h>
  41 #include <asm/byteorder.h>
  42 #include "ext4_common.h"
  43
  44 struct ext2_data *ext4fs_root;
  45 struct ext2fs_node *ext4fs_file;
  46 uint32_t *ext4fs_indir1_block;
  47 int ext4fs_indir1_size;
  48 int ext4fs_indir1_blkno = -1;
  49 uint32_t *ext4fs_indir2_block;
  50 int ext4fs_indir2_size;
  51 int ext4fs_indir2_blkno = -1;
  52
  53 uint32_t *ext4fs_indir3_block;
  54 int ext4fs_indir3_size;
  55 int ext4fs_indir3_blkno = -1;
  56 struct ext2_inode *g_parent_inode;
  57 static int symlinknest;
  58
  59 #if defined(CONFIG_CMD_EXT4_WRITE)
  60 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
  61 {
  62         uint32_t res = size / n;
  63         if (res * n != size)
  64                 res++;
  65
  66         return res;
  67 }
  68
  69 void put_ext4(uint64_t off, void *buf, uint32_t size)
  70 {
  71         uint64_t startblock;
  72         uint64_t remainder;
  73         unsigned char *temp_ptr = NULL;
  74         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, SECTOR_SIZE);
  75         struct ext_filesystem *fs = get_fs();
  76
  77         startblock = off / (uint64_t)SECTOR_SIZE;
  78         startblock += part_offset;
  79         remainder = off % (uint64_t)SECTOR_SIZE;
  80         remainder &= SECTOR_SIZE - 1;
  81
  82         if (fs->dev_desc == NULL)
  83                 return;
  84
  85         if ((startblock + (size / SECTOR_SIZE)) >
  86             (part_offset + fs->total_sect)) {
  87                 printf("part_offset is %lu\n", part_offset);
  88                 printf("total_sector is %llu\n", fs->total_sect);
  89                 printf("error: overflow occurs\n");
  90                 return;
  91         }
  92
  93         if (remainder) {
  94                 if (fs->dev_desc->block_read) {
  95                         fs->dev_desc->block_read(fs->dev_desc->dev,
  96                                                  startblock, 1, sec_buf);
  97                         temp_ptr = sec_buf;
  98                         memcpy((temp_ptr + remainder),
  99                                (unsigned char *)buf, size);
 100                         fs->dev_desc->block_write(fs->dev_desc->dev,
 101                                                   startblock, 1, sec_buf);
 102                 }
 103         } else {
 104                 if (size / SECTOR_SIZE != 0) {
 105                         fs->dev_desc->block_write(fs->dev_desc->dev,
 106                                                   startblock,
 107                                                   size / SECTOR_SIZE,
 108                                                   (unsigned long *)buf);
 109                 } else {
 110                         fs->dev_desc->block_read(fs->dev_desc->dev,
 111                                                  startblock, 1, sec_buf);
 112                         temp_ptr = sec_buf;
 113                         memcpy(temp_ptr, buf, size);
 114                         fs->dev_desc->block_write(fs->dev_desc->dev,
 115                                                   startblock, 1,
 116                                                   (unsigned long *)sec_buf);
 117                 }
 118         }
 119 }
 120
 121 static int _get_new_inode_no(unsigned char *buffer)
 122 {
 123         struct ext_filesystem *fs = get_fs();
 124         unsigned char input;
 125         int operand, status;
 126         int count = 1;
 127         int j = 0;
 128
 129         /* get the blocksize of the filesystem */
 130         unsigned char *ptr = buffer;
 131         while (*ptr == 255) {
 132                 ptr++;
 133                 count += 8;
 134                 if (count > ext4fs_root->sblock.inodes_per_group)
 135                         return -1;
 136         }
 137
 138         for (j = 0; j < fs->blksz; j++) {
 139                 input = *ptr;
 140                 int i = 0;
 141                 while (i <= 7) {
 142                         operand = 1 << i;
 143                         status = input & operand;
 144                         if (status) {
 145                                 i++;
 146                                 count++;
 147                         } else {
 148                                 *ptr |= operand;
 149                                 return count;
 150                         }
 151                 }
 152                 ptr = ptr + 1;
 153         }
 154
 155         return -1;
 156 }
 157
 158 static int _get_new_blk_no(unsigned char *buffer)
 159 {
 160         unsigned char input;
 161         int operand, status;
 162         int count = 0;
 163         int j = 0;
 164         unsigned char *ptr = buffer;
 165         struct ext_filesystem *fs = get_fs();
 166
 167         if (fs->blksz != 1024)
 168                 count = 0;
 169         else
 170                 count = 1;
 171
 172         while (*ptr == 255) {
 173                 ptr++;
 174                 count += 8;
 175                 if (count == (fs->blksz * 8))
 176                         return -1;
 177         }
 178
 179         for (j = 0; j < fs->blksz; j++) {
 180                 input = *ptr;
 181                 int i = 0;
 182                 while (i <= 7) {
 183                         operand = 1 << i;
 184                         status = input & operand;
 185                         if (status) {
 186                                 i++;
 187                                 count++;
 188                         } else {
 189                                 *ptr |= operand;
 190                                 return count;
 191                         }
 192                 }
 193                 ptr = ptr + 1;
 194         }
 195
 196         return -1;
 197 }
 198
 199 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
 200 {
 201         int i, remainder, status;
 202         unsigned char *ptr = buffer;
 203         unsigned char operand;
 204         i = blockno / 8;
 205         remainder = blockno % 8;
 206         int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
 207
 208         i = i - (index * blocksize);
 209         if (blocksize != 1024) {
 210                 ptr = ptr + i;
 211                 operand = 1 << remainder;
 212                 status = *ptr & operand;
 213                 if (status)
 214                         return -1;
 215
 216                 *ptr = *ptr | operand;
 217                 return 0;
 218         } else {
 219                 if (remainder == 0) {
 220                         ptr = ptr + i - 1;
 221                         operand = (1 << 7);
 222                 } else {
 223                         ptr = ptr + i;
 224                         operand = (1 << (remainder - 1));
 225                 }
 226                 status = *ptr & operand;
 227                 if (status)
 228                         return -1;
 229
 230                 *ptr = *ptr | operand;
 231                 return 0;
 232         }
 233 }
 234
 235 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
 236 {
 237         int i, remainder, status;
 238         unsigned char *ptr = buffer;
 239         unsigned char operand;
 240         i = blockno / 8;
 241         remainder = blockno % 8;
 242         int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
 243
 244         i = i - (index * blocksize);
 245         if (blocksize != 1024) {
 246                 ptr = ptr + i;
 247                 operand = (1 << remainder);
 248                 status = *ptr & operand;
 249                 if (status)
 250                         *ptr = *ptr & ~(operand);
 251         } else {
 252                 if (remainder == 0) {
 253                         ptr = ptr + i - 1;
 254                         operand = (1 << 7);
 255                 } else {
 256                         ptr = ptr + i;
 257                         operand = (1 << (remainder - 1));
 258                 }
 259                 status = *ptr & operand;
 260                 if (status)
 261                         *ptr = *ptr & ~(operand);
 262         }
 263 }
 264
 265 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
 266 {
 267         int i, remainder, status;
 268         unsigned char *ptr = buffer;
 269         unsigned char operand;
 270
 271         inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
 272         i = inode_no / 8;
 273         remainder = inode_no % 8;
 274         if (remainder == 0) {
 275                 ptr = ptr + i - 1;
 276                 operand = (1 << 7);
 277         } else {
 278                 ptr = ptr + i;
 279                 operand = (1 << (remainder - 1));
 280         }
 281         status = *ptr & operand;
 282         if (status)
 283                 return -1;
 284
 285         *ptr = *ptr | operand;
 286
 287         return 0;
 288 }
 289
 290 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
 291 {
 292         int i, remainder, status;
 293         unsigned char *ptr = buffer;
 294         unsigned char operand;
 295
 296         inode_no -= (index * ext4fs_root->sblock.inodes_per_group);
 297         i = inode_no / 8;
 298         remainder = inode_no % 8;
 299         if (remainder == 0) {
 300                 ptr = ptr + i - 1;
 301                 operand = (1 << 7);
 302         } else {
 303                 ptr = ptr + i;
 304                 operand = (1 << (remainder - 1));
 305         }
 306         status = *ptr & operand;
 307         if (status)
 308                 *ptr = *ptr & ~(operand);
 309 }
 310
 311 int ext4fs_checksum_update(unsigned int i)
 312 {
 313         struct ext2_block_group *desc;
 314         struct ext_filesystem *fs = get_fs();
 315         __u16 crc = 0;
 316
 317         desc = (struct ext2_block_group *)&fs->gd[i];
 318         if (fs->sb->feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
 319                 int offset = offsetof(struct ext2_block_group, bg_checksum);
 320
 321                 crc = ext2fs_crc16(~0, fs->sb->unique_id,
 322                                    sizeof(fs->sb->unique_id));
 323                 crc = ext2fs_crc16(crc, &i, sizeof(i));
 324                 crc = ext2fs_crc16(crc, desc, offset);
 325                 offset += sizeof(desc->bg_checksum);    /* skip checksum */
 326                 assert(offset == sizeof(*desc));
 327         }
 328
 329         return crc;
 330 }
 331
 332 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
 333 {
 334         int dentry_length;
 335         int sizeof_void_space;
 336         int new_entry_byte_reqd;
 337         short padding_factor = 0;
 338
 339         if (dir->namelen % 4 != 0)
 340                 padding_factor = 4 - (dir->namelen % 4);
 341
 342         dentry_length = sizeof(struct ext2_dirent) +
 343                         dir->namelen + padding_factor;
 344         sizeof_void_space = dir->direntlen - dentry_length;
 345         if (sizeof_void_space == 0)
 346                 return 0;
 347
 348         padding_factor = 0;
 349         if (strlen(filename) % 4 != 0)
 350                 padding_factor = 4 - (strlen(filename) % 4);
 351
 352         new_entry_byte_reqd = strlen(filename) +
 353             sizeof(struct ext2_dirent) + padding_factor;
 354         if (sizeof_void_space >= new_entry_byte_reqd) {
 355                 dir->direntlen = dentry_length;
 356                 return sizeof_void_space;
 357         }
 358
 359         return 0;
 360 }
 361
 362 void ext4fs_update_parent_dentry(char *filename, int *p_ino, int file_type)
 363 {
 364         unsigned int *zero_buffer = NULL;
 365         char *root_first_block_buffer = NULL;
 366         int direct_blk_idx;
 367         long int root_blknr;
 368         long int first_block_no_of_root = 0;
 369         long int previous_blknr = -1;
 370         int totalbytes = 0;
 371         short int padding_factor = 0;
 372         unsigned int new_entry_byte_reqd;
 373         unsigned int last_entry_dirlen;
 374         int sizeof_void_space = 0;
 375         int templength = 0;
 376         int inodeno;
 377         int status;
 378         struct ext_filesystem *fs = get_fs();
 379         /* directory entry */
 380         struct ext2_dirent *dir;
 381         char *ptr = NULL;
 382         char *temp_dir = NULL;
 383
 384         zero_buffer = zalloc(fs->blksz);
 385         if (!zero_buffer) {
 386                 printf("No Memory\n");
 387                 return;
 388         }
 389         root_first_block_buffer = zalloc(fs->blksz);
 390         if (!root_first_block_buffer) {
 391                 free(zero_buffer);
 392                 printf("No Memory\n");
 393                 return;
 394         }
 395 restart:
 396
 397         /* read the block no allocated to a file */
 398         for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
 399              direct_blk_idx++) {
 400                 root_blknr = read_allocated_block(g_parent_inode,
 401                                                   direct_blk_idx);
 402                 if (root_blknr == 0) {
 403                         first_block_no_of_root = previous_blknr;
 404                         break;
 405                 }
 406                 previous_blknr = root_blknr;
 407         }
 408
 409         status = ext4fs_devread(first_block_no_of_root
 410                                 * fs->sect_perblk,
 411                                 0, fs->blksz, root_first_block_buffer);
 412         if (status == 0)
 413                 goto fail;
 414
 415         if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
 416                 goto fail;
 417         dir = (struct ext2_dirent *)root_first_block_buffer;
 418         ptr = (char *)dir;
 419         totalbytes = 0;
 420         while (dir->direntlen > 0) {
 421                 /*
 422                  * blocksize-totalbytes because last directory length
 423                  * i.e. dir->direntlen is free availble space in the
 424                  * block that means  it is a last entry of directory
 425                  * entry
 426                  */
 427
 428                 /* traversing the each directory entry */
 429                 if (fs->blksz - totalbytes == dir->direntlen) {
 430                         if (strlen(filename) % 4 != 0)
 431                                 padding_factor = 4 - (strlen(filename) % 4);
 432
 433                         new_entry_byte_reqd = strlen(filename) +
 434                             sizeof(struct ext2_dirent) + padding_factor;
 435                         padding_factor = 0;
 436                         /*
 437                          * update last directory entry length to its
 438                          * length because we are creating new directory
 439                          * entry
 440                          */
 441                         if (dir->namelen % 4 != 0)
 442                                 padding_factor = 4 - (dir->namelen % 4);
 443
 444                         last_entry_dirlen = dir->namelen +
 445                             sizeof(struct ext2_dirent) + padding_factor;
 446                         if ((fs->blksz - totalbytes - last_entry_dirlen) <
 447                                 new_entry_byte_reqd) {
 448                                 printf("1st Block Full:Allocate new block\n");
 449
 450                                 if (direct_blk_idx == INDIRECT_BLOCKS - 1) {
 451                                         printf("Directory exceeds limit\n");
 452                                         goto fail;
 453                                 }
 454                                 g_parent_inode->b.blocks.dir_blocks
 455                                     [direct_blk_idx] = ext4fs_get_new_blk_no();
 456                                 if (g_parent_inode->b.blocks.dir_blocks
 457                                         [direct_blk_idx] == -1) {
 458                                         printf("no block left to assign\n");
 459                                         goto fail;
 460                                 }
 461                                 put_ext4(((uint64_t)
 462                                           (g_parent_inode->b.
 463                                            blocks.dir_blocks[direct_blk_idx] *
 464                                            fs->blksz)), zero_buffer, fs->blksz);
 465                                 g_parent_inode->size =
 466                                     g_parent_inode->size + fs->blksz;
 467                                 g_parent_inode->blockcnt =
 468                                     g_parent_inode->blockcnt + fs->sect_perblk;
 469                                 if (ext4fs_put_metadata
 470                                     (root_first_block_buffer,
 471                                      first_block_no_of_root))
 472                                         goto fail;
 473                                 goto restart;
 474                         }
 475                         dir->direntlen = last_entry_dirlen;
 476                         break;
 477                 }
 478
 479                 templength = dir->direntlen;
 480                 totalbytes = totalbytes + templength;
 481                 sizeof_void_space = check_void_in_dentry(dir, filename);
 482                 if (sizeof_void_space)
 483                         break;
 484
 485                 dir = (struct ext2_dirent *)((char *)dir + templength);
 486                 ptr = (char *)dir;
 487         }
 488
 489         /* make a pointer ready for creating next directory entry */
 490         templength = dir->direntlen;
 491         totalbytes = totalbytes + templength;
 492         dir = (struct ext2_dirent *)((char *)dir + templength);
 493         ptr = (char *)dir;
 494
 495         /* get the next available inode number */
 496         inodeno = ext4fs_get_new_inode_no();
 497         if (inodeno == -1) {
 498                 printf("no inode left to assign\n");
 499                 goto fail;
 500         }
 501         dir->inode = inodeno;
 502         if (sizeof_void_space)
 503                 dir->direntlen = sizeof_void_space;
 504         else
 505                 dir->direntlen = fs->blksz - totalbytes;
 506
 507         dir->namelen = strlen(filename);
 508         dir->filetype = FILETYPE_REG;   /* regular file */
 509         temp_dir = (char *)dir;
 510         temp_dir = temp_dir + sizeof(struct ext2_dirent);
 511         memcpy(temp_dir, filename, strlen(filename));
 512
 513         *p_ino = inodeno;
 514
 515         /* update or write  the 1st block of root inode */
 516         if (ext4fs_put_metadata(root_first_block_buffer,
 517                                 first_block_no_of_root))
 518                 goto fail;
 519
 520 fail:
 521         free(zero_buffer);
 522         free(root_first_block_buffer);
 523 }
 524
 525 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
 526 {
 527         int status;
 528         int inodeno;
 529         int totalbytes;
 530         int templength;
 531         int direct_blk_idx;
 532         long int blknr;
 533         int found = 0;
 534         char *ptr = NULL;
 535         unsigned char *block_buffer = NULL;
 536         struct ext2_dirent *dir = NULL;
 537         struct ext2_dirent *previous_dir = NULL;
 538         struct ext_filesystem *fs = get_fs();
 539
 540         /* read the block no allocated to a file */
 541         for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
 542                 direct_blk_idx++) {
 543                 blknr = read_allocated_block(parent_inode, direct_blk_idx);
 544                 if (blknr == 0)
 545                         goto fail;
 546
 547                 /* read the blocks of parenet inode */
 548                 block_buffer = zalloc(fs->blksz);
 549                 if (!block_buffer)
 550                         goto fail;
 551
 552                 status = ext4fs_devread(blknr * fs->sect_perblk,
 553                                         0, fs->blksz, (char *)block_buffer);
 554                 if (status == 0)
 555                         goto fail;
 556
 557                 dir = (struct ext2_dirent *)block_buffer;
 558                 ptr = (char *)dir;
 559                 totalbytes = 0;
 560                 while (dir->direntlen >= 0) {
 561                         /*
 562                          * blocksize-totalbytes because last directory
 563                          * length i.e.,*dir->direntlen is free availble
 564                          * space in the block that means
 565                          * it is a last entry of directory entry
 566                          */
 567                         if (strlen(dirname) == dir->namelen) {
 568                                 if (strncmp(dirname, ptr +
 569                                         sizeof(struct ext2_dirent),
 570                                         dir->namelen) == 0) {
 571                                         previous_dir->direntlen +=
 572                                                         dir->direntlen;
 573                                         inodeno = dir->inode;
 574                                         dir->inode = 0;
 575                                         found = 1;
 576                                         break;
 577                                 }
 578                         }
 579
 580                         if (fs->blksz - totalbytes == dir->direntlen)
 581                                 break;
 582
 583                         /* traversing the each directory entry */
 584                         templength = dir->direntlen;
 585                         totalbytes = totalbytes + templength;
 586                         previous_dir = dir;
 587                         dir = (struct ext2_dirent *)((char *)dir + templength);
 588                         ptr = (char *)dir;
 589                 }
 590
 591                 if (found == 1) {
 592                         free(block_buffer);
 593                         block_buffer = NULL;
 594                         return inodeno;
 595                 }
 596
 597                 free(block_buffer);
 598                 block_buffer = NULL;
 599         }
 600
 601 fail:
 602         free(block_buffer);
 603
 604         return -1;
 605 }
 606
 607 static int find_dir_depth(char *dirname)
 608 {
 609         char *token = strtok(dirname, "/");
 610         int count = 0;
 611         while (token != NULL) {
 612                 token = strtok(NULL, "/");
 613                 count++;
 614         }
 615         return count + 1 + 1;
 616         /*
 617          * for example  for string /home/temp
 618          * depth=home(1)+temp(1)+1 extra for NULL;
 619          * so count is 4;
 620          */
 621 }
 622
 623 static int parse_path(char **arr, char *dirname)
 624 {
 625         char *token = strtok(dirname, "/");
 626         int i = 0;
 627
 628         /* add root */
 629         arr[i] = zalloc(strlen("/") + 1);
 630         if (!arr[i])
 631                 return -ENOMEM;
 632
 633         arr[i++] = "/";
 634
 635         /* add each path entry after root */
 636         while (token != NULL) {
 637                 arr[i] = zalloc(strlen(token) + 1);
 638                 if (!arr[i])
 639                         return -ENOMEM;
 640                 memcpy(arr[i++], token, strlen(token));
 641                 token = strtok(NULL, "/");
 642         }
 643         arr[i] = NULL;
 644
 645         return 0;
 646 }
 647
 648 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
 649 {
 650         if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
 651                 return -1;
 652
 653         return 0;
 654 }
 655
 656 /*
 657  * Function: ext4fs_get_parent_inode_num
 658  * Return Value: inode Number of the parent directory of  file/Directory to be
 659  * created
 660  * dirname : Input parmater, input path name of the file/directory to be created
 661  * dname : Output parameter, to be filled with the name of the directory
 662  * extracted from dirname
 663  */
 664 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
 665 {
 666         int i;
 667         int depth = 0;
 668         int matched_inode_no;
 669         int result_inode_no = -1;
 670         char **ptr = NULL;
 671         char *depth_dirname = NULL;
 672         char *parse_dirname = NULL;
 673         struct ext2_inode *parent_inode = NULL;
 674         struct ext2_inode *first_inode = NULL;
 675         struct ext2_inode temp_inode;
 676
 677         if (*dirname != '/') {
 678                 printf("Please supply Absolute path\n");
 679                 return -1;
 680         }
 681
 682         /* TODO: input validation make equivalent to linux */
 683         depth_dirname = zalloc(strlen(dirname) + 1);
 684         if (!depth_dirname)
 685                 return -ENOMEM;
 686
 687         memcpy(depth_dirname, dirname, strlen(dirname));
 688         depth = find_dir_depth(depth_dirname);
 689         parse_dirname = zalloc(strlen(dirname) + 1);
 690         if (!parse_dirname)
 691                 goto fail;
 692         memcpy(parse_dirname, dirname, strlen(dirname));
 693
 694         /* allocate memory for each directory level */
 695         ptr = zalloc((depth) * sizeof(char *));
 696         if (!ptr)
 697                 goto fail;
 698         if (parse_path(ptr, parse_dirname))
 699                 goto fail;
 700         parent_inode = zalloc(sizeof(struct ext2_inode));
 701         if (!parent_inode)
 702                 goto fail;
 703         first_inode = zalloc(sizeof(struct ext2_inode));
 704         if (!first_inode)
 705                 goto fail;
 706         memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
 707         memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
 708         if (flags & F_FILE)
 709                 result_inode_no = EXT2_ROOT_INO;
 710         for (i = 1; i < depth; i++) {
 711                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 712                 if (matched_inode_no == -1) {
 713                         if (ptr[i + 1] == NULL && i == 1) {
 714                                 result_inode_no = EXT2_ROOT_INO;
 715                                 goto end;
 716                         } else {
 717                                 if (ptr[i + 1] == NULL)
 718                                         break;
 719                                 printf("Invalid path\n");
 720                                 result_inode_no = -1;
 721                                 goto fail;
 722                         }
 723                 } else {
 724                         if (ptr[i + 1] != NULL) {
 725                                 memset(parent_inode, '\0',
 726                                        sizeof(struct ext2_inode));
 727                                 if (ext4fs_iget(matched_inode_no,
 728                                                 parent_inode)) {
 729                                         result_inode_no = -1;
 730                                         goto fail;
 731                                 }
 732                                 result_inode_no = matched_inode_no;
 733                         } else {
 734                                 break;
 735                         }
 736                 }
 737         }
 738
 739 end:
 740         if (i == 1)
 741                 matched_inode_no = search_dir(first_inode, ptr[i]);
 742         else
 743                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 744
 745         if (matched_inode_no != -1) {
 746                 ext4fs_iget(matched_inode_no, &temp_inode);
 747                 if (temp_inode.mode & S_IFDIR) {
 748                         printf("It is a Directory\n");
 749                         result_inode_no = -1;
 750                         goto fail;
 751                 }
 752         }
 753
 754         if (strlen(ptr[i]) > 256) {
 755                 result_inode_no = -1;
 756                 goto fail;
 757         }
 758         memcpy(dname, ptr[i], strlen(ptr[i]));
 759
 760 fail:
 761         free(depth_dirname);
 762         free(parse_dirname);
 763         free(ptr);
 764         free(parent_inode);
 765         free(first_inode);
 766
 767         return result_inode_no;
 768 }
 769
 770 static int check_filename(char *filename, unsigned int blknr)
 771 {
 772         unsigned int first_block_no_of_root;
 773         int totalbytes = 0;
 774         int templength = 0;
 775         int status, inodeno;
 776         int found = 0;
 777         char *root_first_block_buffer = NULL;
 778         char *root_first_block_addr = NULL;
 779         struct ext2_dirent *dir = NULL;
 780         struct ext2_dirent *previous_dir = NULL;
 781         char *ptr = NULL;
 782         struct ext_filesystem *fs = get_fs();
 783
 784         /* get the first block of root */
 785         first_block_no_of_root = blknr;
 786         root_first_block_buffer = zalloc(fs->blksz);
 787         if (!root_first_block_buffer)
 788                 return -ENOMEM;
 789         root_first_block_addr = root_first_block_buffer;
 790         status = ext4fs_devread(first_block_no_of_root *
 791                                 fs->sect_perblk, 0,
 792                                 fs->blksz, root_first_block_buffer);
 793         if (status == 0)
 794                 goto fail;
 795
 796         if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
 797                 goto fail;
 798         dir = (struct ext2_dirent *)root_first_block_buffer;
 799         ptr = (char *)dir;
 800         totalbytes = 0;
 801         while (dir->direntlen >= 0) {
 802                 /*
 803                  * blocksize-totalbytes because last
 804                  * directory length i.e., *dir->direntlen
 805                  * is free availble space in the block that
 806                  * means it is a last entry of directory entry
 807                  */
 808                 if (strlen(filename) == dir->namelen) {
 809                         if (strncmp(filename, ptr + sizeof(struct ext2_dirent),
 810                                 dir->namelen) == 0) {
 811                                 printf("file found deleting\n");
 812                                 previous_dir->direntlen += dir->direntlen;
 813                                 inodeno = dir->inode;
 814                                 dir->inode = 0;
 815                                 found = 1;
 816                                 break;
 817                         }
 818                 }
 819
 820                 if (fs->blksz - totalbytes == dir->direntlen)
 821                         break;
 822
 823                 /* traversing the each directory entry */
 824                 templength = dir->direntlen;
 825                 totalbytes = totalbytes + templength;
 826                 previous_dir = dir;
 827                 dir = (struct ext2_dirent *)((char *)dir + templength);
 828                 ptr = (char *)dir;
 829         }
 830
 831
 832         if (found == 1) {
 833                 if (ext4fs_put_metadata(root_first_block_addr,
 834                                         first_block_no_of_root))
 835                         goto fail;
 836                 return inodeno;
 837         }
 838 fail:
 839         free(root_first_block_buffer);
 840
 841         return -1;
 842 }
 843
 844 int ext4fs_filename_check(char *filename)
 845 {
 846         short direct_blk_idx = 0;
 847         long int blknr = -1;
 848         int inodeno = -1;
 849
 850         /* read the block no allocated to a file */
 851         for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
 852                 direct_blk_idx++) {
 853                 blknr = read_allocated_block(g_parent_inode, direct_blk_idx);
 854                 if (blknr == 0)
 855                         break;
 856                 inodeno = check_filename(filename, blknr);
 857                 if (inodeno != -1)
 858                         return inodeno;
 859         }
 860
 861         return -1;
 862 }
 863
 864 long int ext4fs_get_new_blk_no(void)
 865 {
 866         short i;
 867         short status;
 868         int remainder;
 869         unsigned int bg_idx;
 870         static int prev_bg_bitmap_index = -1;
 871         unsigned int blk_per_grp = ext4fs_root->sblock.blocks_per_group;
 872         struct ext_filesystem *fs = get_fs();
 873         char *journal_buffer = zalloc(fs->blksz);
 874         char *zero_buffer = zalloc(fs->blksz);
 875         if (!journal_buffer || !zero_buffer)
 876                 goto fail;
 877         struct ext2_block_group *gd = (struct ext2_block_group *)fs->gdtable;
 878
 879         if (fs->first_pass_bbmap == 0) {
 880                 for (i = 0; i < fs->no_blkgrp; i++) {
 881                         if (gd[i].free_blocks) {
 882                                 if (gd[i].bg_flags & EXT4_BG_BLOCK_UNINIT) {
 883                                         put_ext4(((uint64_t) (gd[i].block_id *
 884                                                               fs->blksz)),
 885                                                  zero_buffer, fs->blksz);
 886                                         gd[i].bg_flags =
 887                                             gd[i].
 888                                             bg_flags & ~EXT4_BG_BLOCK_UNINIT;
 889                                         memcpy(fs->blk_bmaps[i], zero_buffer,
 890                                                fs->blksz);
 891                                 }
 892                                 fs->curr_blkno =
 893                                     _get_new_blk_no(fs->blk_bmaps[i]);
 894                                 if (fs->curr_blkno == -1)
 895                                         /* if block bitmap is completely fill */
 896                                         continue;
 897                                 fs->curr_blkno = fs->curr_blkno +
 898                                                 (i * fs->blksz * 8);
 899                                 fs->first_pass_bbmap++;
 900                                 gd[i].free_blocks--;
 901                                 fs->sb->free_blocks--;
 902                                 status = ext4fs_devread(gd[i].block_id *
 903                                                         fs->sect_perblk, 0,
 904                                                         fs->blksz,
 905                                                         journal_buffer);
 906                                 if (status == 0)
 907                                         goto fail;
 908                                 if (ext4fs_log_journal(journal_buffer,
 909                                                         gd[i].block_id))
 910                                         goto fail;
 911                                 goto success;
 912                         } else {
 913                                 debug("no space left on block group %d\n", i);
 914                         }
 915                 }
 916
 917                 goto fail;
 918         } else {
 919 restart:
 920                 fs->curr_blkno++;
 921                 /* get the blockbitmap index respective to blockno */
 922                 if (fs->blksz != 1024) {
 923                         bg_idx = fs->curr_blkno / blk_per_grp;
 924                 } else {
 925                         bg_idx = fs->curr_blkno / blk_per_grp;
 926                         remainder = fs->curr_blkno % blk_per_grp;
 927                         if (!remainder)
 928                                 bg_idx--;
 929                 }
 930
 931                 /*
 932                  * To skip completely filled block group bitmaps
 933                  * Optimize the block allocation
 934                  */
 935                 if (bg_idx >= fs->no_blkgrp)
 936                         goto fail;
 937
 938                 if (gd[bg_idx].free_blocks == 0) {
 939                         debug("block group %u is full. Skipping\n", bg_idx);
 940                         fs->curr_blkno = fs->curr_blkno + blk_per_grp;
 941                         fs->curr_blkno--;
 942                         goto restart;
 943                 }
 944
 945                 if (gd[bg_idx].bg_flags & EXT4_BG_BLOCK_UNINIT) {
 946                         memset(zero_buffer, '\0', fs->blksz);
 947                         put_ext4(((uint64_t) (gd[bg_idx].block_id * fs->blksz)),
 948                                  zero_buffer, fs->blksz);
 949                         memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
 950                         gd[bg_idx].bg_flags = gd[bg_idx].bg_flags &
 951                                                 ~EXT4_BG_BLOCK_UNINIT;
 952                 }
 953
 954                 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
 955                                    bg_idx) != 0) {
 956                         debug("going for restart for the block no %ld %u\n",
 957                               fs->curr_blkno, bg_idx);
 958                         goto restart;
 959                 }
 960
 961                 /* journal backup */
 962                 if (prev_bg_bitmap_index != bg_idx) {
 963                         memset(journal_buffer, '\0', fs->blksz);
 964                         status = ext4fs_devread(gd[bg_idx].block_id
 965                                                 * fs->sect_perblk,
 966                                                 0, fs->blksz, journal_buffer);
 967                         if (status == 0)
 968                                 goto fail;
 969                         if (ext4fs_log_journal(journal_buffer,
 970                                                 gd[bg_idx].block_id))
 971                                 goto fail;
 972
 973                         prev_bg_bitmap_index = bg_idx;
 974                 }
 975                 gd[bg_idx].free_blocks--;
 976                 fs->sb->free_blocks--;
 977                 goto success;
 978         }
 979 success:
 980         free(journal_buffer);
 981         free(zero_buffer);
 982
 983         return fs->curr_blkno;
 984 fail:
 985         free(journal_buffer);
 986         free(zero_buffer);
 987
 988         return -1;
 989 }
 990
 991 int ext4fs_get_new_inode_no(void)
 992 {
 993         short i;
 994         short status;
 995         unsigned int ibmap_idx;
 996         static int prev_inode_bitmap_index = -1;
 997         unsigned int inodes_per_grp = ext4fs_root->sblock.inodes_per_group;
 998         struct ext_filesystem *fs = get_fs();
 999         char *journal_buffer = zalloc(fs->blksz);
1000         char *zero_buffer = zalloc(fs->blksz);
1001         if (!journal_buffer || !zero_buffer)
1002                 goto fail;
1003         struct ext2_block_group *gd = (struct ext2_block_group *)fs->gdtable;
1004
1005         if (fs->first_pass_ibmap == 0) {
1006                 for (i = 0; i < fs->no_blkgrp; i++) {
1007                         if (gd[i].free_inodes) {
1008                                 if (gd[i].bg_itable_unused != gd[i].free_inodes)
1009                                         gd[i].bg_itable_unused =
1010                                                 gd[i].free_inodes;
1011                                 if (gd[i].bg_flags & EXT4_BG_INODE_UNINIT) {
1012                                         put_ext4(((uint64_t)
1013                                                   (gd[i].inode_id * fs->blksz)),
1014                                                  zero_buffer, fs->blksz);
1015                                         gd[i].bg_flags = gd[i].bg_flags &
1016                                                         ~EXT4_BG_INODE_UNINIT;
1017                                         memcpy(fs->inode_bmaps[i],
1018                                                zero_buffer, fs->blksz);
1019                                 }
1020                                 fs->curr_inode_no =
1021                                     _get_new_inode_no(fs->inode_bmaps[i]);
1022                                 if (fs->curr_inode_no == -1)
1023                                         /* if block bitmap is completely fill */
1024                                         continue;
1025                                 fs->curr_inode_no = fs->curr_inode_no +
1026                                                         (i * inodes_per_grp);
1027                                 fs->first_pass_ibmap++;
1028                                 gd[i].free_inodes--;
1029                                 gd[i].bg_itable_unused--;
1030                                 fs->sb->free_inodes--;
1031                                 status = ext4fs_devread(gd[i].inode_id *
1032                                                         fs->sect_perblk, 0,
1033                                                         fs->blksz,
1034                                                         journal_buffer);
1035                                 if (status == 0)
1036                                         goto fail;
1037                                 if (ext4fs_log_journal(journal_buffer,
1038                                                         gd[i].inode_id))
1039                                         goto fail;
1040                                 goto success;
1041                         } else
1042                                 debug("no inode left on block group %d\n", i);
1043                 }
1044                 goto fail;
1045         } else {
1046 restart:
1047                 fs->curr_inode_no++;
1048                 /* get the blockbitmap index respective to blockno */
1049                 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1050                 if (gd[ibmap_idx].bg_flags & EXT4_BG_INODE_UNINIT) {
1051                         memset(zero_buffer, '\0', fs->blksz);
1052                         put_ext4(((uint64_t) (gd[ibmap_idx].inode_id *
1053                                               fs->blksz)), zero_buffer,
1054                                  fs->blksz);
1055                         gd[ibmap_idx].bg_flags =
1056                             gd[ibmap_idx].bg_flags & ~EXT4_BG_INODE_UNINIT;
1057                         memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1058                                 fs->blksz);
1059                 }
1060
1061                 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1062                                           fs->inode_bmaps[ibmap_idx],
1063                                           ibmap_idx) != 0) {
1064                         debug("going for restart for the block no %d %u\n",
1065                               fs->curr_inode_no, ibmap_idx);
1066                         goto restart;
1067                 }
1068
1069                 /* journal backup */
1070                 if (prev_inode_bitmap_index != ibmap_idx) {
1071                         memset(journal_buffer, '\0', fs->blksz);
1072                         status = ext4fs_devread(gd[ibmap_idx].inode_id
1073                                                 * fs->sect_perblk,
1074                                                 0, fs->blksz, journal_buffer);
1075                         if (status == 0)
1076                                 goto fail;
1077                         if (ext4fs_log_journal(journal_buffer,
1078                                                 gd[ibmap_idx].inode_id))
1079                                 goto fail;
1080                         prev_inode_bitmap_index = ibmap_idx;
1081                 }
1082                 if (gd[ibmap_idx].bg_itable_unused != gd[ibmap_idx].free_inodes)
1083                         gd[ibmap_idx].bg_itable_unused =
1084                                         gd[ibmap_idx].free_inodes;
1085                 gd[ibmap_idx].free_inodes--;
1086                 gd[ibmap_idx].bg_itable_unused--;
1087                 fs->sb->free_inodes--;
1088                 goto success;
1089         }
1090
1091 success:
1092         free(journal_buffer);
1093         free(zero_buffer);
1094
1095         return fs->curr_inode_no;
1096 fail:
1097         free(journal_buffer);
1098         free(zero_buffer);
1099
1100         return -1;
1101
1102 }
1103
1104
1105 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1106                                         unsigned int *total_remaining_blocks,
1107                                         unsigned int *no_blks_reqd)
1108 {
1109         short i;
1110         short status;
1111         long int actual_block_no;
1112         long int si_blockno;
1113         /* si :single indirect */
1114         unsigned int *si_buffer = NULL;
1115         unsigned int *si_start_addr = NULL;
1116         struct ext_filesystem *fs = get_fs();
1117
1118         if (*total_remaining_blocks != 0) {
1119                 si_buffer = zalloc(fs->blksz);
1120                 if (!si_buffer) {
1121                         printf("No Memory\n");
1122                         return;
1123                 }
1124                 si_start_addr = si_buffer;
1125                 si_blockno = ext4fs_get_new_blk_no();
1126                 if (si_blockno == -1) {
1127                         printf("no block left to assign\n");
1128                         goto fail;
1129                 }
1130                 (*no_blks_reqd)++;
1131                 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1132
1133                 status = ext4fs_devread(si_blockno * fs->sect_perblk,
1134                                         0, fs->blksz, (char *)si_buffer);
1135                 memset(si_buffer, '\0', fs->blksz);
1136                 if (status == 0)
1137                         goto fail;
1138
1139                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1140                         actual_block_no = ext4fs_get_new_blk_no();
1141                         if (actual_block_no == -1) {
1142                                 printf("no block left to assign\n");
1143                                 goto fail;
1144                         }
1145                         *si_buffer = actual_block_no;
1146                         debug("SIAB %u: %u\n", *si_buffer,
1147                                 *total_remaining_blocks);
1148
1149                         si_buffer++;
1150                         (*total_remaining_blocks)--;
1151                         if (*total_remaining_blocks == 0)
1152                                 break;
1153                 }
1154
1155                 /* write the block to disk */
1156                 put_ext4(((uint64_t) (si_blockno * fs->blksz)),
1157                          si_start_addr, fs->blksz);
1158                 file_inode->b.blocks.indir_block = si_blockno;
1159         }
1160 fail:
1161         free(si_start_addr);
1162 }
1163
1164 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1165                                         unsigned int *total_remaining_blocks,
1166                                         unsigned int *no_blks_reqd)
1167 {
1168         short i;
1169         short j;
1170         short status;
1171         long int actual_block_no;
1172         /* di:double indirect */
1173         long int di_blockno_parent;
1174         long int di_blockno_child;
1175         unsigned int *di_parent_buffer = NULL;
1176         unsigned int *di_child_buff = NULL;
1177         unsigned int *di_block_start_addr = NULL;
1178         unsigned int *di_child_buff_start = NULL;
1179         struct ext_filesystem *fs = get_fs();
1180
1181         if (*total_remaining_blocks != 0) {
1182                 /* double indirect parent block connecting to inode */
1183                 di_blockno_parent = ext4fs_get_new_blk_no();
1184                 if (di_blockno_parent == -1) {
1185                         printf("no block left to assign\n");
1186                         goto fail;
1187                 }
1188                 di_parent_buffer = zalloc(fs->blksz);
1189                 if (!di_parent_buffer)
1190                         goto fail;
1191
1192                 di_block_start_addr = di_parent_buffer;
1193                 (*no_blks_reqd)++;
1194                 debug("DIPB %ld: %u\n", di_blockno_parent,
1195                       *total_remaining_blocks);
1196
1197                 status = ext4fs_devread(di_blockno_parent *
1198                                         fs->sect_perblk, 0,
1199                                         fs->blksz, (char *)di_parent_buffer);
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(di_blockno_child *
1224                                                 fs->sect_perblk, 0,
1225                                                 fs->blksz,
1226                                                 (char *)di_child_buff);
1227                         memset(di_child_buff, '\0', fs->blksz);
1228                         /* filling of actual datablocks for each child */
1229                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1230                                 actual_block_no = ext4fs_get_new_blk_no();
1231                                 if (actual_block_no == -1) {
1232                                         printf("no block left to assign\n");
1233                                         goto fail;
1234                                 }
1235                                 *di_child_buff = actual_block_no;
1236                                 debug("DIAB %ld: %u\n", actual_block_no,
1237                                       *total_remaining_blocks);
1238
1239                                 di_child_buff++;
1240                                 (*total_remaining_blocks)--;
1241                                 if (*total_remaining_blocks == 0)
1242                                         break;
1243                         }
1244                         /* write the block  table */
1245                         put_ext4(((uint64_t) (di_blockno_child * fs->blksz)),
1246                                  di_child_buff_start, fs->blksz);
1247                         free(di_child_buff_start);
1248                         di_child_buff_start = NULL;
1249
1250                         if (*total_remaining_blocks == 0)
1251                                 break;
1252                 }
1253                 put_ext4(((uint64_t) (di_blockno_parent * fs->blksz)),
1254                          di_block_start_addr, fs->blksz);
1255                 file_inode->b.blocks.double_indir_block = di_blockno_parent;
1256         }
1257 fail:
1258         free(di_block_start_addr);
1259 }
1260
1261 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1262                                         unsigned int *total_remaining_blocks,
1263                                         unsigned int *no_blks_reqd)
1264 {
1265         short i;
1266         short j;
1267         short k;
1268         long int actual_block_no;
1269         /* ti: Triple Indirect */
1270         long int ti_gp_blockno;
1271         long int ti_parent_blockno;
1272         long int ti_child_blockno;
1273         unsigned int *ti_gp_buff = NULL;
1274         unsigned int *ti_parent_buff = NULL;
1275         unsigned int *ti_child_buff = NULL;
1276         unsigned int *ti_gp_buff_start_addr = NULL;
1277         unsigned int *ti_pbuff_start_addr = NULL;
1278         unsigned int *ti_cbuff_start_addr = NULL;
1279         struct ext_filesystem *fs = get_fs();
1280         if (*total_remaining_blocks != 0) {
1281                 /* triple indirect grand parent block connecting to inode */
1282                 ti_gp_blockno = ext4fs_get_new_blk_no();
1283                 if (ti_gp_blockno == -1) {
1284                         printf("no block left to assign\n");
1285                         goto fail;
1286                 }
1287                 ti_gp_buff = zalloc(fs->blksz);
1288                 if (!ti_gp_buff)
1289                         goto fail;
1290
1291                 ti_gp_buff_start_addr = ti_gp_buff;
1292                 (*no_blks_reqd)++;
1293                 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1294                       *total_remaining_blocks);
1295
1296                 /* for each 4 byte grand parent entry create one more block */
1297                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1298                         ti_parent_blockno = ext4fs_get_new_blk_no();
1299                         if (ti_parent_blockno == -1) {
1300                                 printf("no block left to assign\n");
1301                                 goto fail;
1302                         }
1303                         ti_parent_buff = zalloc(fs->blksz);
1304                         if (!ti_parent_buff)
1305                                 goto fail;
1306
1307                         ti_pbuff_start_addr = ti_parent_buff;
1308                         *ti_gp_buff = ti_parent_blockno;
1309                         ti_gp_buff++;
1310                         (*no_blks_reqd)++;
1311                         debug("TIPB %ld: %u\n", ti_parent_blockno,
1312                               *total_remaining_blocks);
1313
1314                         /* for each 4 byte entry parent create one more block */
1315                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1316                                 ti_child_blockno = ext4fs_get_new_blk_no();
1317                                 if (ti_child_blockno == -1) {
1318                                         printf("no block left assign\n");
1319                                         goto fail;
1320                                 }
1321                                 ti_child_buff = zalloc(fs->blksz);
1322                                 if (!ti_child_buff)
1323                                         goto fail;
1324
1325                                 ti_cbuff_start_addr = ti_child_buff;
1326                                 *ti_parent_buff = ti_child_blockno;
1327                                 ti_parent_buff++;
1328                                 (*no_blks_reqd)++;
1329                                 debug("TICB %ld: %u\n", ti_parent_blockno,
1330                                       *total_remaining_blocks);
1331
1332                                 /* fill actual datablocks for each child */
1333                                 for (k = 0; k < (fs->blksz / sizeof(int));
1334                                         k++) {
1335                                         actual_block_no =
1336                                             ext4fs_get_new_blk_no();
1337                                         if (actual_block_no == -1) {
1338                                                 printf("no block left\n");
1339                                                 goto fail;
1340                                         }
1341                                         *ti_child_buff = actual_block_no;
1342                                         debug("TIAB %ld: %u\n", actual_block_no,
1343                                               *total_remaining_blocks);
1344
1345                                         ti_child_buff++;
1346                                         (*total_remaining_blocks)--;
1347                                         if (*total_remaining_blocks == 0)
1348                                                 break;
1349                                 }
1350                                 /* write the child block */
1351                                 put_ext4(((uint64_t) (ti_child_blockno *
1352                                                       fs->blksz)),
1353                                          ti_cbuff_start_addr, fs->blksz);
1354                                 free(ti_cbuff_start_addr);
1355
1356                                 if (*total_remaining_blocks == 0)
1357                                         break;
1358                         }
1359                         /* write the parent block */
1360                         put_ext4(((uint64_t) (ti_parent_blockno * fs->blksz)),
1361                                  ti_pbuff_start_addr, fs->blksz);
1362                         free(ti_pbuff_start_addr);
1363
1364                         if (*total_remaining_blocks == 0)
1365                                 break;
1366                 }
1367                 /* write the grand parent block */
1368                 put_ext4(((uint64_t) (ti_gp_blockno * fs->blksz)),
1369                          ti_gp_buff_start_addr, fs->blksz);
1370                 file_inode->b.blocks.triple_indir_block = ti_gp_blockno;
1371         }
1372 fail:
1373         free(ti_gp_buff_start_addr);
1374 }
1375
1376 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1377                                 unsigned int total_remaining_blocks,
1378                                 unsigned int *total_no_of_block)
1379 {
1380         short i;
1381         long int direct_blockno;
1382         unsigned int no_blks_reqd = 0;
1383
1384         /* allocation of direct blocks */
1385         for (i = 0; i < INDIRECT_BLOCKS; i++) {
1386                 direct_blockno = ext4fs_get_new_blk_no();
1387                 if (direct_blockno == -1) {
1388                         printf("no block left to assign\n");
1389                         return;
1390                 }
1391                 file_inode->b.blocks.dir_blocks[i] = direct_blockno;
1392                 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1393
1394                 total_remaining_blocks--;
1395                 if (total_remaining_blocks == 0)
1396                         break;
1397         }
1398
1399         alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1400                                     &no_blks_reqd);
1401         alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1402                                     &no_blks_reqd);
1403         alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1404                                     &no_blks_reqd);
1405         *total_no_of_block += no_blks_reqd;
1406 }
1407
1408 #endif
1409
1410 static struct ext4_extent_header *ext4fs_get_extent_block
1411         (struct ext2_data *data, char *buf,
1412                 struct ext4_extent_header *ext_block,
1413                 uint32_t fileblock, int log2_blksz)
1414 {
1415         struct ext4_extent_idx *index;
1416         unsigned long long block;
1417         struct ext_filesystem *fs = get_fs();
1418         int i;
1419
1420         while (1) {
1421                 index = (struct ext4_extent_idx *)(ext_block + 1);
1422
1423                 if (le32_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1424                         return 0;
1425
1426                 if (ext_block->eh_depth == 0)
1427                         return ext_block;
1428                 i = -1;
1429                 do {
1430                         i++;
1431                         if (i >= le32_to_cpu(ext_block->eh_entries))
1432                                 break;
1433                 } while (fileblock > le32_to_cpu(index[i].ei_block));
1434
1435                 if (--i < 0)
1436                         return 0;
1437
1438                 block = le32_to_cpu(index[i].ei_leaf_hi);
1439                 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1440
1441                 if (ext4fs_devread(block << log2_blksz, 0, fs->blksz, buf))
1442                         ext_block = (struct ext4_extent_header *)buf;
1443                 else
1444                         return 0;
1445         }
1446 }
1447
1448 static int ext4fs_blockgroup
1449         (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1450 {
1451         long int blkno;
1452         unsigned int blkoff, desc_per_blk;
1453
1454         desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
1455
1456         blkno = __le32_to_cpu(data->sblock.first_data_block) + 1 +
1457                         group / desc_per_blk;
1458         blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
1459
1460         debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1461               group, blkno, blkoff);
1462
1463         return ext4fs_devread(blkno << LOG2_EXT2_BLOCK_SIZE(data),
1464                               blkoff, sizeof(struct ext2_block_group),
1465                               (char *)blkgrp);
1466 }
1467
1468 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1469 {
1470         struct ext2_block_group blkgrp;
1471         struct ext2_sblock *sblock = &data->sblock;
1472         struct ext_filesystem *fs = get_fs();
1473         int inodes_per_block, status;
1474         long int blkno;
1475         unsigned int blkoff;
1476
1477         /* It is easier to calculate if the first inode is 0. */
1478         ino--;
1479         status = ext4fs_blockgroup(data, ino / __le32_to_cpu
1480                                    (sblock->inodes_per_group), &blkgrp);
1481         if (status == 0)
1482                 return 0;
1483
1484         inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1485         blkno = __le32_to_cpu(blkgrp.inode_table_id) +
1486             (ino % __le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1487         blkoff = (ino % inodes_per_block) * fs->inodesz;
1488         /* Read the inode. */
1489         status = ext4fs_devread(blkno << LOG2_EXT2_BLOCK_SIZE(data), blkoff,
1490                                 sizeof(struct ext2_inode), (char *)inode);
1491         if (status == 0)
1492                 return 0;
1493
1494         return 1;
1495 }
1496
1497 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1498 {
1499         long int blknr;
1500         int blksz;
1501         int log2_blksz;
1502         int status;
1503         long int rblock;
1504         long int perblock_parent;
1505         long int perblock_child;
1506         unsigned long long start;
1507         /* get the blocksize of the filesystem */
1508         blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1509         log2_blksz = LOG2_EXT2_BLOCK_SIZE(ext4fs_root);
1510         if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1511                 char *buf = zalloc(blksz);
1512                 if (!buf)
1513                         return -ENOMEM;
1514                 struct ext4_extent_header *ext_block;
1515                 struct ext4_extent *extent;
1516                 int i = -1;
1517                 ext_block = ext4fs_get_extent_block(ext4fs_root, buf,
1518                                                     (struct ext4_extent_header
1519                                                      *)inode->b.
1520                                                     blocks.dir_blocks,
1521                                                     fileblock, log2_blksz);
1522                 if (!ext_block) {
1523                         printf("invalid extent block\n");
1524                         free(buf);
1525                         return -EINVAL;
1526                 }
1527
1528                 extent = (struct ext4_extent *)(ext_block + 1);
1529
1530                 do {
1531                         i++;
1532                         if (i >= le32_to_cpu(ext_block->eh_entries))
1533                                 break;
1534                 } while (fileblock >= le32_to_cpu(extent[i].ee_block));
1535                 if (--i >= 0) {
1536                         fileblock -= le32_to_cpu(extent[i].ee_block);
1537                         if (fileblock >= le32_to_cpu(extent[i].ee_len)) {
1538                                 free(buf);
1539                                 return 0;
1540                         }
1541
1542                         start = le32_to_cpu(extent[i].ee_start_hi);
1543                         start = (start << 32) +
1544                                         le32_to_cpu(extent[i].ee_start_lo);
1545                         free(buf);
1546                         return fileblock + start;
1547                 }
1548
1549                 printf("Extent Error\n");
1550                 free(buf);
1551                 return -1;
1552         }
1553
1554         /* Direct blocks. */
1555         if (fileblock < INDIRECT_BLOCKS)
1556                 blknr = __le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1557
1558         /* Indirect. */
1559         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1560                 if (ext4fs_indir1_block == NULL) {
1561                         ext4fs_indir1_block = zalloc(blksz);
1562                         if (ext4fs_indir1_block == NULL) {
1563                                 printf("** SI ext2fs read block (indir 1)"
1564                                         "malloc failed. **\n");
1565                                 return -1;
1566                         }
1567                         ext4fs_indir1_size = blksz;
1568                         ext4fs_indir1_blkno = -1;
1569                 }
1570                 if (blksz != ext4fs_indir1_size) {
1571                         free(ext4fs_indir1_block);
1572                         ext4fs_indir1_block = NULL;
1573                         ext4fs_indir1_size = 0;
1574                         ext4fs_indir1_blkno = -1;
1575                         ext4fs_indir1_block = zalloc(blksz);
1576                         if (ext4fs_indir1_block == NULL) {
1577                                 printf("** SI ext2fs read block (indir 1):"
1578                                         "malloc failed. **\n");
1579                                 return -1;
1580                         }
1581                         ext4fs_indir1_size = blksz;
1582                 }
1583                 if ((__le32_to_cpu(inode->b.blocks.indir_block) <<
1584                      log2_blksz) != ext4fs_indir1_blkno) {
1585                         status =
1586                             ext4fs_devread(__le32_to_cpu
1587                                            (inode->b.blocks.
1588                                             indir_block) << log2_blksz, 0,
1589                                            blksz, (char *)ext4fs_indir1_block);
1590                         if (status == 0) {
1591                                 printf("** SI ext2fs read block (indir 1)"
1592                                         "failed. **\n");
1593                                 return 0;
1594                         }
1595                         ext4fs_indir1_blkno =
1596                                 __le32_to_cpu(inode->b.blocks.
1597                                                indir_block) << log2_blksz;
1598                 }
1599                 blknr = __le32_to_cpu(ext4fs_indir1_block
1600                                       [fileblock - INDIRECT_BLOCKS]);
1601         }
1602         /* Double indirect. */
1603         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1604                                         (blksz / 4 + 1)))) {
1605
1606                 long int perblock = blksz / 4;
1607                 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1608
1609                 if (ext4fs_indir1_block == NULL) {
1610                         ext4fs_indir1_block = zalloc(blksz);
1611                         if (ext4fs_indir1_block == NULL) {
1612                                 printf("** DI ext2fs read block (indir 2 1)"
1613                                         "malloc failed. **\n");
1614                                 return -1;
1615                         }
1616                         ext4fs_indir1_size = blksz;
1617                         ext4fs_indir1_blkno = -1;
1618                 }
1619                 if (blksz != ext4fs_indir1_size) {
1620                         free(ext4fs_indir1_block);
1621                         ext4fs_indir1_block = NULL;
1622                         ext4fs_indir1_size = 0;
1623                         ext4fs_indir1_blkno = -1;
1624                         ext4fs_indir1_block = zalloc(blksz);
1625                         if (ext4fs_indir1_block == NULL) {
1626                                 printf("** DI ext2fs read block (indir 2 1)"
1627                                         "malloc failed. **\n");
1628                                 return -1;
1629                         }
1630                         ext4fs_indir1_size = blksz;
1631                 }
1632                 if ((__le32_to_cpu(inode->b.blocks.double_indir_block) <<
1633                      log2_blksz) != ext4fs_indir1_blkno) {
1634                         status =
1635                             ext4fs_devread(__le32_to_cpu
1636                                            (inode->b.blocks.
1637                                             double_indir_block) << log2_blksz,
1638                                            0, blksz,
1639                                            (char *)ext4fs_indir1_block);
1640                         if (status == 0) {
1641                                 printf("** DI ext2fs read block (indir 2 1)"
1642                                         "failed. **\n");
1643                                 return -1;
1644                         }
1645                         ext4fs_indir1_blkno =
1646                             __le32_to_cpu(inode->b.blocks.double_indir_block) <<
1647                             log2_blksz;
1648                 }
1649
1650                 if (ext4fs_indir2_block == NULL) {
1651                         ext4fs_indir2_block = zalloc(blksz);
1652                         if (ext4fs_indir2_block == NULL) {
1653                                 printf("** DI ext2fs read block (indir 2 2)"
1654                                         "malloc failed. **\n");
1655                                 return -1;
1656                         }
1657                         ext4fs_indir2_size = blksz;
1658                         ext4fs_indir2_blkno = -1;
1659                 }
1660                 if (blksz != ext4fs_indir2_size) {
1661                         free(ext4fs_indir2_block);
1662                         ext4fs_indir2_block = NULL;
1663                         ext4fs_indir2_size = 0;
1664                         ext4fs_indir2_blkno = -1;
1665                         ext4fs_indir2_block = zalloc(blksz);
1666                         if (ext4fs_indir2_block == NULL) {
1667                                 printf("** DI ext2fs read block (indir 2 2)"
1668                                         "malloc failed. **\n");
1669                                 return -1;
1670                         }
1671                         ext4fs_indir2_size = blksz;
1672                 }
1673                 if ((__le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1674                      log2_blksz) != ext4fs_indir2_blkno) {
1675                         status = ext4fs_devread(__le32_to_cpu
1676                                                 (ext4fs_indir1_block
1677                                                  [rblock /
1678                                                   perblock]) << log2_blksz, 0,
1679                                                 blksz,
1680                                                 (char *)ext4fs_indir2_block);
1681                         if (status == 0) {
1682                                 printf("** DI ext2fs read block (indir 2 2)"
1683                                         "failed. **\n");
1684                                 return -1;
1685                         }
1686                         ext4fs_indir2_blkno =
1687                             __le32_to_cpu(ext4fs_indir1_block[rblock
1688                                                               /
1689                                                               perblock]) <<
1690                             log2_blksz;
1691                 }
1692                 blknr = __le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1693         }
1694         /* Tripple indirect. */
1695         else {
1696                 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1697                                       (blksz / 4 * blksz / 4));
1698                 perblock_child = blksz / 4;
1699                 perblock_parent = ((blksz / 4) * (blksz / 4));
1700
1701                 if (ext4fs_indir1_block == NULL) {
1702                         ext4fs_indir1_block = zalloc(blksz);
1703                         if (ext4fs_indir1_block == NULL) {
1704                                 printf("** TI ext2fs read block (indir 2 1)"
1705                                         "malloc failed. **\n");
1706                                 return -1;
1707                         }
1708                         ext4fs_indir1_size = blksz;
1709                         ext4fs_indir1_blkno = -1;
1710                 }
1711                 if (blksz != ext4fs_indir1_size) {
1712                         free(ext4fs_indir1_block);
1713                         ext4fs_indir1_block = NULL;
1714                         ext4fs_indir1_size = 0;
1715                         ext4fs_indir1_blkno = -1;
1716                         ext4fs_indir1_block = zalloc(blksz);
1717                         if (ext4fs_indir1_block == NULL) {
1718                                 printf("** TI ext2fs read block (indir 2 1)"
1719                                         "malloc failed. **\n");
1720                                 return -1;
1721                         }
1722                         ext4fs_indir1_size = blksz;
1723                 }
1724                 if ((__le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1725                      log2_blksz) != ext4fs_indir1_blkno) {
1726                         status = ext4fs_devread
1727                             (__le32_to_cpu(inode->b.blocks.triple_indir_block)
1728                              << log2_blksz, 0, blksz,
1729                              (char *)ext4fs_indir1_block);
1730                         if (status == 0) {
1731                                 printf("** TI ext2fs read block (indir 2 1)"
1732                                         "failed. **\n");
1733                                 return -1;
1734                         }
1735                         ext4fs_indir1_blkno =
1736                             __le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1737                             log2_blksz;
1738                 }
1739
1740                 if (ext4fs_indir2_block == NULL) {
1741                         ext4fs_indir2_block = zalloc(blksz);
1742                         if (ext4fs_indir2_block == NULL) {
1743                                 printf("** TI ext2fs read block (indir 2 2)"
1744                                         "malloc failed. **\n");
1745                                 return -1;
1746                         }
1747                         ext4fs_indir2_size = blksz;
1748                         ext4fs_indir2_blkno = -1;
1749                 }
1750                 if (blksz != ext4fs_indir2_size) {
1751                         free(ext4fs_indir2_block);
1752                         ext4fs_indir2_block = NULL;
1753                         ext4fs_indir2_size = 0;
1754                         ext4fs_indir2_blkno = -1;
1755                         ext4fs_indir2_block = zalloc(blksz);
1756                         if (ext4fs_indir2_block == NULL) {
1757                                 printf("** TI ext2fs read block (indir 2 2)"
1758                                         "malloc failed. **\n");
1759                                 return -1;
1760                         }
1761                         ext4fs_indir2_size = blksz;
1762                 }
1763                 if ((__le32_to_cpu(ext4fs_indir1_block[rblock /
1764                                                        perblock_parent]) <<
1765                      log2_blksz)
1766                     != ext4fs_indir2_blkno) {
1767                         status = ext4fs_devread(__le32_to_cpu
1768                                                 (ext4fs_indir1_block
1769                                                  [rblock /
1770                                                   perblock_parent]) <<
1771                                                 log2_blksz, 0, blksz,
1772                                                 (char *)ext4fs_indir2_block);
1773                         if (status == 0) {
1774                                 printf("** TI ext2fs read block (indir 2 2)"
1775                                         "failed. **\n");
1776                                 return -1;
1777                         }
1778                         ext4fs_indir2_blkno =
1779                             __le32_to_cpu(ext4fs_indir1_block[rblock /
1780                                                               perblock_parent])
1781                             << log2_blksz;
1782                 }
1783
1784                 if (ext4fs_indir3_block == NULL) {
1785                         ext4fs_indir3_block = zalloc(blksz);
1786                         if (ext4fs_indir3_block == NULL) {
1787                                 printf("** TI ext2fs read block (indir 2 2)"
1788                                         "malloc failed. **\n");
1789                                 return -1;
1790                         }
1791                         ext4fs_indir3_size = blksz;
1792                         ext4fs_indir3_blkno = -1;
1793                 }
1794                 if (blksz != ext4fs_indir3_size) {
1795                         free(ext4fs_indir3_block);
1796                         ext4fs_indir3_block = NULL;
1797                         ext4fs_indir3_size = 0;
1798                         ext4fs_indir3_blkno = -1;
1799                         ext4fs_indir3_block = zalloc(blksz);
1800                         if (ext4fs_indir3_block == NULL) {
1801                                 printf("** TI ext2fs read block (indir 2 2)"
1802                                         "malloc failed. **\n");
1803                                 return -1;
1804                         }
1805                         ext4fs_indir3_size = blksz;
1806                 }
1807                 if ((__le32_to_cpu(ext4fs_indir2_block[rblock
1808                                                        /
1809                                                        perblock_child]) <<
1810                      log2_blksz) != ext4fs_indir3_blkno) {
1811                         status =
1812                             ext4fs_devread(__le32_to_cpu
1813                                            (ext4fs_indir2_block
1814                                             [(rblock / perblock_child)
1815                                              % (blksz / 4)]) << log2_blksz, 0,
1816                                            blksz, (char *)ext4fs_indir3_block);
1817                         if (status == 0) {
1818                                 printf("** TI ext2fs read block (indir 2 2)"
1819                                        "failed. **\n");
1820                                 return -1;
1821                         }
1822                         ext4fs_indir3_blkno =
1823                             __le32_to_cpu(ext4fs_indir2_block[(rblock /
1824                                                                perblock_child) %
1825                                                               (blksz /
1826                                                                4)]) <<
1827                             log2_blksz;
1828                 }
1829
1830                 blknr = __le32_to_cpu(ext4fs_indir3_block
1831                                       [rblock % perblock_child]);
1832         }
1833         debug("ext4fs_read_block %ld\n", blknr);
1834
1835         return blknr;
1836 }
1837
1838 void ext4fs_close(void)
1839 {
1840         if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1841                 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1842                 ext4fs_file = NULL;
1843         }
1844         if (ext4fs_root != NULL) {
1845                 free(ext4fs_root);
1846                 ext4fs_root = NULL;
1847         }
1848         if (ext4fs_indir1_block != NULL) {
1849                 free(ext4fs_indir1_block);
1850                 ext4fs_indir1_block = NULL;
1851                 ext4fs_indir1_size = 0;
1852                 ext4fs_indir1_blkno = -1;
1853         }
1854         if (ext4fs_indir2_block != NULL) {
1855                 free(ext4fs_indir2_block);
1856                 ext4fs_indir2_block = NULL;
1857                 ext4fs_indir2_size = 0;
1858                 ext4fs_indir2_blkno = -1;
1859         }
1860         if (ext4fs_indir3_block != NULL) {
1861                 free(ext4fs_indir3_block);
1862                 ext4fs_indir3_block = NULL;
1863                 ext4fs_indir3_size = 0;
1864                 ext4fs_indir3_blkno = -1;
1865         }
1866 }
1867
1868 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1869                                 struct ext2fs_node **fnode, int *ftype)
1870 {
1871         unsigned int fpos = 0;
1872         int status;
1873         struct ext2fs_node *diro = (struct ext2fs_node *) dir;
1874
1875 #ifdef DEBUG
1876         if (name != NULL)
1877                 printf("Iterate dir %s\n", name);
1878 #endif /* of DEBUG */
1879         if (!diro->inode_read) {
1880                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
1881                 if (status == 0)
1882                         return 0;
1883         }
1884         /* Search the file.  */
1885         while (fpos < __le32_to_cpu(diro->inode.size)) {
1886                 struct ext2_dirent dirent;
1887
1888                 status = ext4fs_read_file(diro, fpos,
1889                                            sizeof(struct ext2_dirent),
1890                                            (char *) &dirent);
1891                 if (status < 1)
1892                         return 0;
1893
1894                 if (dirent.namelen != 0) {
1895                         char filename[dirent.namelen + 1];
1896                         struct ext2fs_node *fdiro;
1897                         int type = FILETYPE_UNKNOWN;
1898
1899                         status = ext4fs_read_file(diro,
1900                                                   fpos +
1901                                                   sizeof(struct ext2_dirent),
1902                                                   dirent.namelen, filename);
1903                         if (status < 1)
1904                                 return 0;
1905
1906                         fdiro = zalloc(sizeof(struct ext2fs_node));
1907                         if (!fdiro)
1908                                 return 0;
1909
1910                         fdiro->data = diro->data;
1911                         fdiro->ino = __le32_to_cpu(dirent.inode);
1912
1913                         filename[dirent.namelen] = '\0';
1914
1915                         if (dirent.filetype != FILETYPE_UNKNOWN) {
1916                                 fdiro->inode_read = 0;
1917
1918                                 if (dirent.filetype == FILETYPE_DIRECTORY)
1919                                         type = FILETYPE_DIRECTORY;
1920                                 else if (dirent.filetype == FILETYPE_SYMLINK)
1921                                         type = FILETYPE_SYMLINK;
1922                                 else if (dirent.filetype == FILETYPE_REG)
1923                                         type = FILETYPE_REG;
1924                         } else {
1925                                 status = ext4fs_read_inode(diro->data,
1926                                                            __le32_to_cpu
1927                                                            (dirent.inode),
1928                                                            &fdiro->inode);
1929                                 if (status == 0) {
1930                                         free(fdiro);
1931                                         return 0;
1932                                 }
1933                                 fdiro->inode_read = 1;
1934
1935                                 if ((__le16_to_cpu(fdiro->inode.mode) &
1936                                      FILETYPE_INO_MASK) ==
1937                                     FILETYPE_INO_DIRECTORY) {
1938                                         type = FILETYPE_DIRECTORY;
1939                                 } else if ((__le16_to_cpu(fdiro->inode.mode)
1940                                             & FILETYPE_INO_MASK) ==
1941                                            FILETYPE_INO_SYMLINK) {
1942                                         type = FILETYPE_SYMLINK;
1943                                 } else if ((__le16_to_cpu(fdiro->inode.mode)
1944                                             & FILETYPE_INO_MASK) ==
1945                                            FILETYPE_INO_REG) {
1946                                         type = FILETYPE_REG;
1947                                 }
1948                         }
1949 #ifdef DEBUG
1950                         printf("iterate >%s<\n", filename);
1951 #endif /* of DEBUG */
1952                         if ((name != NULL) && (fnode != NULL)
1953                             && (ftype != NULL)) {
1954                                 if (strcmp(filename, name) == 0) {
1955                                         *ftype = type;
1956                                         *fnode = fdiro;
1957                                         return 1;
1958                                 }
1959                         } else {
1960                                 if (fdiro->inode_read == 0) {
1961                                         status = ext4fs_read_inode(diro->data,
1962                                                                  __le32_to_cpu(
1963                                                                  dirent.inode),
1964                                                                  &fdiro->inode);
1965                                         if (status == 0) {
1966                                                 free(fdiro);
1967                                                 return 0;
1968                                         }
1969                                         fdiro->inode_read = 1;
1970                                 }
1971                                 switch (type) {
1972                                 case FILETYPE_DIRECTORY:
1973                                         printf("<DIR> ");
1974                                         break;
1975                                 case FILETYPE_SYMLINK:
1976                                         printf("<SYM> ");
1977                                         break;
1978                                 case FILETYPE_REG:
1979                                         printf("      ");
1980                                         break;
1981                                 default:
1982                                         printf("< ? > ");
1983                                         break;
1984                                 }
1985                                 printf("%10d %s\n",
1986                                         __le32_to_cpu(fdiro->inode.size),
1987                                         filename);
1988                         }
1989                         free(fdiro);
1990                 }
1991                 fpos += __le16_to_cpu(dirent.direntlen);
1992         }
1993         return 0;
1994 }
1995
1996 static char *ext4fs_read_symlink(struct ext2fs_node *node)
1997 {
1998         char *symlink;
1999         struct ext2fs_node *diro = node;
2000         int status;
2001
2002         if (!diro->inode_read) {
2003                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2004                 if (status == 0)
2005                         return 0;
2006         }
2007         symlink = zalloc(__le32_to_cpu(diro->inode.size) + 1);
2008         if (!symlink)
2009                 return 0;
2010
2011         if (__le32_to_cpu(diro->inode.size) <= 60) {
2012                 strncpy(symlink, diro->inode.b.symlink,
2013                          __le32_to_cpu(diro->inode.size));
2014         } else {
2015                 status = ext4fs_read_file(diro, 0,
2016                                            __le32_to_cpu(diro->inode.size),
2017                                            symlink);
2018                 if (status == 0) {
2019                         free(symlink);
2020                         return 0;
2021                 }
2022         }
2023         symlink[__le32_to_cpu(diro->inode.size)] = '\0';
2024         return symlink;
2025 }
2026
2027 static int ext4fs_find_file1(const char *currpath,
2028                              struct ext2fs_node *currroot,
2029                              struct ext2fs_node **currfound, int *foundtype)
2030 {
2031         char fpath[strlen(currpath) + 1];
2032         char *name = fpath;
2033         char *next;
2034         int status;
2035         int type = FILETYPE_DIRECTORY;
2036         struct ext2fs_node *currnode = currroot;
2037         struct ext2fs_node *oldnode = currroot;
2038
2039         strncpy(fpath, currpath, strlen(currpath) + 1);
2040
2041         /* Remove all leading slashes. */
2042         while (*name == '/')
2043                 name++;
2044
2045         if (!*name) {
2046                 *currfound = currnode;
2047                 return 1;
2048         }
2049
2050         for (;;) {
2051                 int found;
2052
2053                 /* Extract the actual part from the pathname. */
2054                 next = strchr(name, '/');
2055                 if (next) {
2056                         /* Remove all leading slashes. */
2057                         while (*next == '/')
2058                                 *(next++) = '\0';
2059                 }
2060
2061                 if (type != FILETYPE_DIRECTORY) {
2062                         ext4fs_free_node(currnode, currroot);
2063                         return 0;
2064                 }
2065
2066                 oldnode = currnode;
2067
2068                 /* Iterate over the directory. */
2069                 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2070                 if (found == 0)
2071                         return 0;
2072
2073                 if (found == -1)
2074                         break;
2075
2076                 /* Read in the symlink and follow it. */
2077                 if (type == FILETYPE_SYMLINK) {
2078                         char *symlink;
2079
2080                         /* Test if the symlink does not loop. */
2081                         if (++symlinknest == 8) {
2082                                 ext4fs_free_node(currnode, currroot);
2083                                 ext4fs_free_node(oldnode, currroot);
2084                                 return 0;
2085                         }
2086
2087                         symlink = ext4fs_read_symlink(currnode);
2088                         ext4fs_free_node(currnode, currroot);
2089
2090                         if (!symlink) {
2091                                 ext4fs_free_node(oldnode, currroot);
2092                                 return 0;
2093                         }
2094
2095                         debug("Got symlink >%s<\n", symlink);
2096
2097                         if (symlink[0] == '/') {
2098                                 ext4fs_free_node(oldnode, currroot);
2099                                 oldnode = &ext4fs_root->diropen;
2100                         }
2101
2102                         /* Lookup the node the symlink points to. */
2103                         status = ext4fs_find_file1(symlink, oldnode,
2104                                                     &currnode, &type);
2105
2106                         free(symlink);
2107
2108                         if (status == 0) {
2109                                 ext4fs_free_node(oldnode, currroot);
2110                                 return 0;
2111                         }
2112                 }
2113
2114                 ext4fs_free_node(oldnode, currroot);
2115
2116                 /* Found the node! */
2117                 if (!next || *next == '\0') {
2118                         *currfound = currnode;
2119                         *foundtype = type;
2120                         return 1;
2121                 }
2122                 name = next;
2123         }
2124         return -1;
2125 }
2126
2127 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2128         struct ext2fs_node **foundnode, int expecttype)
2129 {
2130         int status;
2131         int foundtype = FILETYPE_DIRECTORY;
2132
2133         symlinknest = 0;
2134         if (!path)
2135                 return 0;
2136
2137         status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2138         if (status == 0)
2139                 return 0;
2140
2141         /* Check if the node that was found was of the expected type. */
2142         if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2143                 return 0;
2144         else if ((expecttype == FILETYPE_DIRECTORY)
2145                    && (foundtype != expecttype))
2146                 return 0;
2147
2148         return 1;
2149 }
2150
2151 int ext4fs_open(const char *filename)
2152 {
2153         struct ext2fs_node *fdiro = NULL;
2154         int status;
2155         int len;
2156
2157         if (ext4fs_root == NULL)
2158                 return -1;
2159
2160         ext4fs_file = NULL;
2161         status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2162                                   FILETYPE_REG);
2163         if (status == 0)
2164                 goto fail;
2165
2166         if (!fdiro->inode_read) {
2167                 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2168                                 &fdiro->inode);
2169                 if (status == 0)
2170                         goto fail;
2171         }
2172         len = __le32_to_cpu(fdiro->inode.size);
2173         ext4fs_file = fdiro;
2174
2175         return len;
2176 fail:
2177         ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2178
2179         return -1;
2180 }
2181
2182 int ext4fs_mount(unsigned part_length)
2183 {
2184         struct ext2_data *data;
2185         int status;
2186         struct ext_filesystem *fs = get_fs();
2187         data = zalloc(sizeof(struct ext2_data));
2188         if (!data)
2189                 return 0;
2190
2191         /* Read the superblock. */
2192         status = ext4fs_devread(1 * 2, 0, sizeof(struct ext2_sblock),
2193                                 (char *)&data->sblock);
2194
2195         if (status == 0)
2196                 goto fail;
2197
2198         /* Make sure this is an ext2 filesystem. */
2199         if (__le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2200                 goto fail;
2201
2202         if (__le32_to_cpu(data->sblock.revision_level == 0))
2203                 fs->inodesz = 128;
2204         else
2205                 fs->inodesz = __le16_to_cpu(data->sblock.inode_size);
2206
2207         debug("EXT2 rev %d, inode_size %d\n",
2208                __le32_to_cpu(data->sblock.revision_level), fs->inodesz);
2209
2210         data->diropen.data = data;
2211         data->diropen.ino = 2;
2212         data->diropen.inode_read = 1;
2213         data->inode = &data->diropen.inode;
2214
2215         status = ext4fs_read_inode(data, 2, data->inode);
2216         if (status == 0)
2217                 goto fail;
2218
2219         ext4fs_root = data;
2220
2221         return 1;
2222 fail:
2223         printf("Failed to mount ext2 filesystem...\n");
2224         free(data);
2225         ext4fs_root = NULL;
2226
2227         return 0;
2228 }