fs/ext4/ext4_common.c

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