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 __le32 *ext4fs_indir1_block;
  37 int ext4fs_indir1_size;
  38 int ext4fs_indir1_blkno = -1;
  39 __le32 *ext4fs_indir2_block;
  40 int ext4fs_indir2_size;
  41 int ext4fs_indir2_blkno = -1;
  42
  43 __le32 *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 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb)
  51 {
  52         sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1);
  53 }
  54
  55 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb)
  56 {
  57         sb->free_blocks = cpu_to_le32(le32_to_cpu(sb->free_blocks) - 1);
  58 }
  59
  60 static inline void ext4fs_bg_free_inodes_dec(struct ext2_block_group *bg)
  61 {
  62         bg->free_inodes = cpu_to_le16(le16_to_cpu(bg->free_inodes) - 1);
  63 }
  64
  65 static inline void ext4fs_bg_free_blocks_dec(struct ext2_block_group *bg)
  66 {
  67         bg->free_blocks = cpu_to_le16(le16_to_cpu(bg->free_blocks) - 1);
  68 }
  69
  70 static inline void ext4fs_bg_itable_unused_dec(struct ext2_block_group *bg)
  71 {
  72         bg->bg_itable_unused = cpu_to_le16(le16_to_cpu(bg->bg_itable_unused) - 1);
  73 }
  74
  75 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
  76 {
  77         uint32_t res = size / n;
  78         if (res * n != size)
  79                 res++;
  80
  81         return res;
  82 }
  83
  84 void put_ext4(uint64_t off, void *buf, uint32_t size)
  85 {
  86         uint64_t startblock;
  87         uint64_t remainder;
  88         unsigned char *temp_ptr = NULL;
  89         struct ext_filesystem *fs = get_fs();
  90         int log2blksz = fs->dev_desc->log2blksz;
  91         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
  92
  93         startblock = off >> log2blksz;
  94         startblock += part_offset;
  95         remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
  96
  97         if (fs->dev_desc == NULL)
  98                 return;
  99
 100         if ((startblock + (size >> log2blksz)) >
 101             (part_offset + fs->total_sect)) {
 102                 printf("part_offset is " LBAFU "\n", part_offset);
 103                 printf("total_sector is %" PRIu64 "\n", fs->total_sect);
 104                 printf("error: overflow occurs\n");
 105                 return;
 106         }
 107
 108         if (remainder) {
 109                 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
 110                 temp_ptr = sec_buf;
 111                 memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
 112                 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
 113         } else {
 114                 if (size >> log2blksz != 0) {
 115                         blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
 116                                    (unsigned long *)buf);
 117                 } else {
 118                         blk_dread(fs->dev_desc, startblock, 1, sec_buf);
 119                         temp_ptr = sec_buf;
 120                         memcpy(temp_ptr, buf, size);
 121                         blk_dwrite(fs->dev_desc, startblock, 1,
 122                                    (unsigned long *)sec_buf);
 123                 }
 124         }
 125 }
 126
 127 static int _get_new_inode_no(unsigned char *buffer)
 128 {
 129         struct ext_filesystem *fs = get_fs();
 130         unsigned char input;
 131         int operand, status;
 132         int count = 1;
 133         int j = 0;
 134
 135         /* get the blocksize of the filesystem */
 136         unsigned char *ptr = buffer;
 137         while (*ptr == 255) {
 138                 ptr++;
 139                 count += 8;
 140                 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group))
 141                         return -1;
 142         }
 143
 144         for (j = 0; j < fs->blksz; j++) {
 145                 input = *ptr;
 146                 int i = 0;
 147                 while (i <= 7) {
 148                         operand = 1 << i;
 149                         status = input & operand;
 150                         if (status) {
 151                                 i++;
 152                                 count++;
 153                         } else {
 154                                 *ptr |= operand;
 155                                 return count;
 156                         }
 157                 }
 158                 ptr = ptr + 1;
 159         }
 160
 161         return -1;
 162 }
 163
 164 static int _get_new_blk_no(unsigned char *buffer)
 165 {
 166         unsigned char input;
 167         int operand, status;
 168         int count = 0;
 169         int j = 0;
 170         unsigned char *ptr = buffer;
 171         struct ext_filesystem *fs = get_fs();
 172
 173         if (fs->blksz != 1024)
 174                 count = 0;
 175         else
 176                 count = 1;
 177
 178         while (*ptr == 255) {
 179                 ptr++;
 180                 count += 8;
 181                 if (count == (fs->blksz * 8))
 182                         return -1;
 183         }
 184
 185         for (j = 0; j < fs->blksz; j++) {
 186                 input = *ptr;
 187                 int i = 0;
 188                 while (i <= 7) {
 189                         operand = 1 << i;
 190                         status = input & operand;
 191                         if (status) {
 192                                 i++;
 193                                 count++;
 194                         } else {
 195                                 *ptr |= operand;
 196                                 return count;
 197                         }
 198                 }
 199                 ptr = ptr + 1;
 200         }
 201
 202         return -1;
 203 }
 204
 205 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
 206 {
 207         int i, remainder, status;
 208         unsigned char *ptr = buffer;
 209         unsigned char operand;
 210         i = blockno / 8;
 211         remainder = blockno % 8;
 212         int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
 213
 214         i = i - (index * blocksize);
 215         if (blocksize != 1024) {
 216                 ptr = ptr + i;
 217                 operand = 1 << remainder;
 218                 status = *ptr & operand;
 219                 if (status)
 220                         return -1;
 221
 222                 *ptr = *ptr | operand;
 223                 return 0;
 224         } else {
 225                 if (remainder == 0) {
 226                         ptr = ptr + i - 1;
 227                         operand = (1 << 7);
 228                 } else {
 229                         ptr = ptr + i;
 230                         operand = (1 << (remainder - 1));
 231                 }
 232                 status = *ptr & operand;
 233                 if (status)
 234                         return -1;
 235
 236                 *ptr = *ptr | operand;
 237                 return 0;
 238         }
 239 }
 240
 241 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
 242 {
 243         int i, remainder, status;
 244         unsigned char *ptr = buffer;
 245         unsigned char operand;
 246         i = blockno / 8;
 247         remainder = blockno % 8;
 248         int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
 249
 250         i = i - (index * blocksize);
 251         if (blocksize != 1024) {
 252                 ptr = ptr + i;
 253                 operand = (1 << remainder);
 254                 status = *ptr & operand;
 255                 if (status)
 256                         *ptr = *ptr & ~(operand);
 257         } else {
 258                 if (remainder == 0) {
 259                         ptr = ptr + i - 1;
 260                         operand = (1 << 7);
 261                 } else {
 262                         ptr = ptr + i;
 263                         operand = (1 << (remainder - 1));
 264                 }
 265                 status = *ptr & operand;
 266                 if (status)
 267                         *ptr = *ptr & ~(operand);
 268         }
 269 }
 270
 271 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
 272 {
 273         int i, remainder, status;
 274         unsigned char *ptr = buffer;
 275         unsigned char operand;
 276
 277         inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
 278         i = inode_no / 8;
 279         remainder = inode_no % 8;
 280         if (remainder == 0) {
 281                 ptr = ptr + i - 1;
 282                 operand = (1 << 7);
 283         } else {
 284                 ptr = ptr + i;
 285                 operand = (1 << (remainder - 1));
 286         }
 287         status = *ptr & operand;
 288         if (status)
 289                 return -1;
 290
 291         *ptr = *ptr | operand;
 292
 293         return 0;
 294 }
 295
 296 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
 297 {
 298         int i, remainder, status;
 299         unsigned char *ptr = buffer;
 300         unsigned char operand;
 301
 302         inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
 303         i = inode_no / 8;
 304         remainder = inode_no % 8;
 305         if (remainder == 0) {
 306                 ptr = ptr + i - 1;
 307                 operand = (1 << 7);
 308         } else {
 309                 ptr = ptr + i;
 310                 operand = (1 << (remainder - 1));
 311         }
 312         status = *ptr & operand;
 313         if (status)
 314                 *ptr = *ptr & ~(operand);
 315 }
 316
 317 uint16_t ext4fs_checksum_update(uint32_t i)
 318 {
 319         struct ext2_block_group *desc;
 320         struct ext_filesystem *fs = get_fs();
 321         uint16_t crc = 0;
 322         __le32 le32_i = cpu_to_le32(i);
 323
 324         desc = (struct ext2_block_group *)&fs->bgd[i];
 325         if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
 326                 int offset = offsetof(struct ext2_block_group, bg_checksum);
 327
 328                 crc = ext2fs_crc16(~0, fs->sb->unique_id,
 329                                    sizeof(fs->sb->unique_id));
 330                 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i));
 331                 crc = ext2fs_crc16(crc, desc, offset);
 332                 offset += sizeof(desc->bg_checksum);    /* skip checksum */
 333                 assert(offset == sizeof(*desc));
 334         }
 335
 336         return crc;
 337 }
 338
 339 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
 340 {
 341         int dentry_length;
 342         int sizeof_void_space;
 343         int new_entry_byte_reqd;
 344         short padding_factor = 0;
 345
 346         if (dir->namelen % 4 != 0)
 347                 padding_factor = 4 - (dir->namelen % 4);
 348
 349         dentry_length = sizeof(struct ext2_dirent) +
 350                         dir->namelen + padding_factor;
 351         sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length;
 352         if (sizeof_void_space == 0)
 353                 return 0;
 354
 355         padding_factor = 0;
 356         if (strlen(filename) % 4 != 0)
 357                 padding_factor = 4 - (strlen(filename) % 4);
 358
 359         new_entry_byte_reqd = strlen(filename) +
 360             sizeof(struct ext2_dirent) + padding_factor;
 361         if (sizeof_void_space >= new_entry_byte_reqd) {
 362                 dir->direntlen = cpu_to_le16(dentry_length);
 363                 return sizeof_void_space;
 364         }
 365
 366         return 0;
 367 }
 368
 369 int ext4fs_update_parent_dentry(char *filename, int file_type)
 370 {
 371         unsigned int *zero_buffer = NULL;
 372         char *root_first_block_buffer = NULL;
 373         int direct_blk_idx;
 374         long int root_blknr;
 375         long int first_block_no_of_root = 0;
 376         long int previous_blknr = -1;
 377         int totalbytes = 0;
 378         short int padding_factor = 0;
 379         unsigned int new_entry_byte_reqd;
 380         unsigned int last_entry_dirlen;
 381         int sizeof_void_space = 0;
 382         int templength = 0;
 383         int inodeno = -1;
 384         int status;
 385         struct ext_filesystem *fs = get_fs();
 386         /* directory entry */
 387         struct ext2_dirent *dir;
 388         char *temp_dir = NULL;
 389         uint32_t new_blk_no;
 390         uint32_t new_size;
 391         uint32_t new_blockcnt;
 392
 393         zero_buffer = zalloc(fs->blksz);
 394         if (!zero_buffer) {
 395                 printf("No Memory\n");
 396                 return -1;
 397         }
 398         root_first_block_buffer = zalloc(fs->blksz);
 399         if (!root_first_block_buffer) {
 400                 free(zero_buffer);
 401                 printf("No Memory\n");
 402                 return -1;
 403         }
 404 restart:
 405
 406         /* read the block no allocated to a file */
 407         for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
 408              direct_blk_idx++) {
 409                 root_blknr = read_allocated_block(g_parent_inode,
 410                                                   direct_blk_idx);
 411                 if (root_blknr == 0) {
 412                         first_block_no_of_root = previous_blknr;
 413                         break;
 414                 }
 415                 previous_blknr = root_blknr;
 416         }
 417
 418         status = ext4fs_devread((lbaint_t)first_block_no_of_root
 419                                 * fs->sect_perblk,
 420                                 0, fs->blksz, root_first_block_buffer);
 421         if (status == 0)
 422                 goto fail;
 423
 424         if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
 425                 goto fail;
 426         dir = (struct ext2_dirent *)root_first_block_buffer;
 427         totalbytes = 0;
 428         while (le16_to_cpu(dir->direntlen) > 0) {
 429                 /*
 430                  * blocksize-totalbytes because last directory length
 431                  * i.e. dir->direntlen is free availble space in the
 432                  * block that means  it is a last entry of directory
 433                  * entry
 434                  */
 435
 436                 /* traversing the each directory entry */
 437                 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) {
 438                         if (strlen(filename) % 4 != 0)
 439                                 padding_factor = 4 - (strlen(filename) % 4);
 440
 441                         new_entry_byte_reqd = strlen(filename) +
 442                             sizeof(struct ext2_dirent) + padding_factor;
 443                         padding_factor = 0;
 444                         /*
 445                          * update last directory entry length to its
 446                          * length because we are creating new directory
 447                          * entry
 448                          */
 449                         if (dir->namelen % 4 != 0)
 450                                 padding_factor = 4 - (dir->namelen % 4);
 451
 452                         last_entry_dirlen = dir->namelen +
 453                             sizeof(struct ext2_dirent) + padding_factor;
 454                         if ((fs->blksz - totalbytes - last_entry_dirlen) <
 455                                 new_entry_byte_reqd) {
 456                                 printf("Last Block Full:Allocate new block\n");
 457
 458                                 if (le32_to_cpu(g_parent_inode->flags) &
 459                                                 EXT4_EXTENTS_FL) {
 460                                         printf("Directory uses extents\n");
 461                                         goto fail;
 462                                 }
 463                                 if (direct_blk_idx == INDIRECT_BLOCKS - 1) {
 464                                         printf("Directory exceeds limit\n");
 465                                         goto fail;
 466                                 }
 467                                 new_blk_no = ext4fs_get_new_blk_no();
 468                                 if (new_blk_no == -1) {
 469                                         printf("no block left to assign\n");
 470                                         goto fail;
 471                                 }
 472                                 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz);
 473                                 g_parent_inode->b.blocks.dir_blocks[direct_blk_idx] =
 474                                         cpu_to_le32(new_blk_no);
 475
 476                                 new_size = le32_to_cpu(g_parent_inode->size);
 477                                 new_size += fs->blksz;
 478                                 g_parent_inode->size = cpu_to_le32(new_size);
 479
 480                                 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt);
 481                                 new_blockcnt += fs->sect_perblk;
 482                                 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt);
 483
 484                                 if (ext4fs_put_metadata
 485                                     (root_first_block_buffer,
 486                                      first_block_no_of_root))
 487                                         goto fail;
 488                                 goto restart;
 489                         }
 490                         dir->direntlen = cpu_to_le16(last_entry_dirlen);
 491                         break;
 492                 }
 493
 494                 templength = le16_to_cpu(dir->direntlen);
 495                 totalbytes = totalbytes + templength;
 496                 sizeof_void_space = check_void_in_dentry(dir, filename);
 497                 if (sizeof_void_space)
 498                         break;
 499
 500                 dir = (struct ext2_dirent *)((char *)dir + templength);
 501         }
 502
 503         /* make a pointer ready for creating next directory entry */
 504         templength = le16_to_cpu(dir->direntlen);
 505         totalbytes = totalbytes + templength;
 506         dir = (struct ext2_dirent *)((char *)dir + templength);
 507
 508         /* get the next available inode number */
 509         inodeno = ext4fs_get_new_inode_no();
 510         if (inodeno == -1) {
 511                 printf("no inode left to assign\n");
 512                 goto fail;
 513         }
 514         dir->inode = cpu_to_le32(inodeno);
 515         if (sizeof_void_space)
 516                 dir->direntlen = cpu_to_le16(sizeof_void_space);
 517         else
 518                 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes);
 519
 520         dir->namelen = strlen(filename);
 521         dir->filetype = FILETYPE_REG;   /* regular file */
 522         temp_dir = (char *)dir;
 523         temp_dir = temp_dir + sizeof(struct ext2_dirent);
 524         memcpy(temp_dir, filename, strlen(filename));
 525
 526         /* update or write  the 1st block of root inode */
 527         if (ext4fs_put_metadata(root_first_block_buffer,
 528                                 first_block_no_of_root))
 529                 goto fail;
 530
 531 fail:
 532         free(zero_buffer);
 533         free(root_first_block_buffer);
 534
 535         return inodeno;
 536 }
 537
 538 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
 539 {
 540         int status;
 541         int inodeno = 0;
 542         int totalbytes;
 543         int templength;
 544         int direct_blk_idx;
 545         long int blknr;
 546         char *ptr = NULL;
 547         unsigned char *block_buffer = NULL;
 548         struct ext2_dirent *dir = NULL;
 549         struct ext_filesystem *fs = get_fs();
 550
 551         /* read the block no allocated to a file */
 552         for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
 553                 direct_blk_idx++) {
 554                 blknr = read_allocated_block(parent_inode, direct_blk_idx);
 555                 if (blknr == 0)
 556                         goto fail;
 557
 558                 /* read the blocks of parent inode */
 559                 block_buffer = zalloc(fs->blksz);
 560                 if (!block_buffer)
 561                         goto fail;
 562
 563                 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
 564                                         0, fs->blksz, (char *)block_buffer);
 565                 if (status == 0)
 566                         goto fail;
 567
 568                 dir = (struct ext2_dirent *)block_buffer;
 569                 ptr = (char *)dir;
 570                 totalbytes = 0;
 571                 while (le16_to_cpu(dir->direntlen) >= 0) {
 572                         /*
 573                          * blocksize-totalbytes because last directory
 574                          * length i.e.,*dir->direntlen is free availble
 575                          * space in the block that means
 576                          * it is a last entry of directory entry
 577                          */
 578                         if (dir->inode && (strlen(dirname) == dir->namelen)) {
 579                                 if (strncmp(dirname, ptr + sizeof(struct ext2_dirent), dir->namelen) == 0) {
 580                                         inodeno = le32_to_cpu(dir->inode);
 581                                         break;
 582                                 }
 583                         }
 584
 585                         if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen))
 586                                 break;
 587
 588                         /* traversing the each directory entry */
 589                         templength = le16_to_cpu(dir->direntlen);
 590                         totalbytes = totalbytes + templength;
 591                         dir = (struct ext2_dirent *)((char *)dir + templength);
 592                         ptr = (char *)dir;
 593                 }
 594
 595                 free(block_buffer);
 596                 block_buffer = NULL;
 597
 598                 if (inodeno > 0)
 599                         return inodeno;
 600         }
 601
 602 fail:
 603         free(block_buffer);
 604
 605         return -1;
 606 }
 607
 608 static int find_dir_depth(char *dirname)
 609 {
 610         char *token = strtok(dirname, "/");
 611         int count = 0;
 612         while (token != NULL) {
 613                 token = strtok(NULL, "/");
 614                 count++;
 615         }
 616         return count + 1 + 1;
 617         /*
 618          * for example  for string /home/temp
 619          * depth=home(1)+temp(1)+1 extra for NULL;
 620          * so count is 4;
 621          */
 622 }
 623
 624 static int parse_path(char **arr, char *dirname)
 625 {
 626         char *token = strtok(dirname, "/");
 627         int i = 0;
 628
 629         /* add root */
 630         arr[i] = zalloc(strlen("/") + 1);
 631         if (!arr[i])
 632                 return -ENOMEM;
 633         memcpy(arr[i++], "/", strlen("/"));
 634
 635         /* add each path entry after root */
 636         while (token != NULL) {
 637                 arr[i] = zalloc(strlen(token) + 1);
 638                 if (!arr[i])
 639                         return -ENOMEM;
 640                 memcpy(arr[i++], token, strlen(token));
 641                 token = strtok(NULL, "/");
 642         }
 643         arr[i] = NULL;
 644
 645         return 0;
 646 }
 647
 648 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
 649 {
 650         if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
 651                 return -1;
 652
 653         return 0;
 654 }
 655
 656 /*
 657  * Function: ext4fs_get_parent_inode_num
 658  * Return Value: inode Number of the parent directory of  file/Directory to be
 659  * created
 660  * dirname : Input parmater, input path name of the file/directory to be created
 661  * dname : Output parameter, to be filled with the name of the directory
 662  * extracted from dirname
 663  */
 664 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
 665 {
 666         int i;
 667         int depth = 0;
 668         int matched_inode_no;
 669         int result_inode_no = -1;
 670         char **ptr = NULL;
 671         char *depth_dirname = NULL;
 672         char *parse_dirname = NULL;
 673         struct ext2_inode *parent_inode = NULL;
 674         struct ext2_inode *first_inode = NULL;
 675         struct ext2_inode temp_inode;
 676
 677         if (*dirname != '/') {
 678                 printf("Please supply Absolute path\n");
 679                 return -1;
 680         }
 681
 682         /* TODO: input validation make equivalent to linux */
 683         depth_dirname = zalloc(strlen(dirname) + 1);
 684         if (!depth_dirname)
 685                 return -ENOMEM;
 686
 687         memcpy(depth_dirname, dirname, strlen(dirname));
 688         depth = find_dir_depth(depth_dirname);
 689         parse_dirname = zalloc(strlen(dirname) + 1);
 690         if (!parse_dirname)
 691                 goto fail;
 692         memcpy(parse_dirname, dirname, strlen(dirname));
 693
 694         /* allocate memory for each directory level */
 695         ptr = zalloc((depth) * sizeof(char *));
 696         if (!ptr)
 697                 goto fail;
 698         if (parse_path(ptr, parse_dirname))
 699                 goto fail;
 700         parent_inode = zalloc(sizeof(struct ext2_inode));
 701         if (!parent_inode)
 702                 goto fail;
 703         first_inode = zalloc(sizeof(struct ext2_inode));
 704         if (!first_inode)
 705                 goto fail;
 706         memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
 707         memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
 708         if (flags & F_FILE)
 709                 result_inode_no = EXT2_ROOT_INO;
 710         for (i = 1; i < depth; i++) {
 711                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 712                 if (matched_inode_no == -1) {
 713                         if (ptr[i + 1] == NULL && i == 1) {
 714                                 result_inode_no = EXT2_ROOT_INO;
 715                                 goto end;
 716                         } else {
 717                                 if (ptr[i + 1] == NULL)
 718                                         break;
 719                                 printf("Invalid path\n");
 720                                 result_inode_no = -1;
 721                                 goto fail;
 722                         }
 723                 } else {
 724                         if (ptr[i + 1] != NULL) {
 725                                 memset(parent_inode, '\0',
 726                                        sizeof(struct ext2_inode));
 727                                 if (ext4fs_iget(matched_inode_no,
 728                                                 parent_inode)) {
 729                                         result_inode_no = -1;
 730                                         goto fail;
 731                                 }
 732                                 result_inode_no = matched_inode_no;
 733                         } else {
 734                                 break;
 735                         }
 736                 }
 737         }
 738
 739 end:
 740         if (i == 1)
 741                 matched_inode_no = search_dir(first_inode, ptr[i]);
 742         else
 743                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 744
 745         if (matched_inode_no != -1) {
 746                 ext4fs_iget(matched_inode_no, &temp_inode);
 747                 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) {
 748                         printf("It is a Directory\n");
 749                         result_inode_no = -1;
 750                         goto fail;
 751                 }
 752         }
 753
 754         if (strlen(ptr[i]) > 256) {
 755                 result_inode_no = -1;
 756                 goto fail;
 757         }
 758         memcpy(dname, ptr[i], strlen(ptr[i]));
 759
 760 fail:
 761         free(depth_dirname);
 762         free(parse_dirname);
 763         for (i = 0; i < depth; i++) {
 764                 if (!ptr[i])
 765                         break;
 766                 free(ptr[i]);
 767         }
 768         free(ptr);
 769         free(parent_inode);
 770         free(first_inode);
 771
 772         return result_inode_no;
 773 }
 774
 775 static int unlink_filename(char *filename, unsigned int blknr)
 776 {
 777         int totalbytes = 0;
 778         int templength = 0;
 779         int status, inodeno;
 780         int found = 0;
 781         char *root_first_block_buffer = NULL;
 782         struct ext2_dirent *dir = NULL;
 783         struct ext2_dirent *previous_dir = NULL;
 784         char *ptr = NULL;
 785         struct ext_filesystem *fs = get_fs();
 786         int ret = -1;
 787
 788         /* get the first block of root */
 789         root_first_block_buffer = zalloc(fs->blksz);
 790         if (!root_first_block_buffer)
 791                 return -ENOMEM;
 792         status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
 793                                 fs->blksz, root_first_block_buffer);
 794         if (status == 0)
 795                 goto fail;
 796
 797         if (ext4fs_log_journal(root_first_block_buffer, blknr))
 798                 goto fail;
 799         dir = (struct ext2_dirent *)root_first_block_buffer;
 800         ptr = (char *)dir;
 801         totalbytes = 0;
 802         while (le16_to_cpu(dir->direntlen) >= 0) {
 803                 /*
 804                  * blocksize-totalbytes because last
 805                  * directory length i.e., *dir->direntlen
 806                  * is free availble space in the block that
 807                  * means it is a last entry of directory entry
 808                  */
 809                 if (dir->inode && (strlen(filename) == dir->namelen) &&
 810                     (strncmp(ptr + sizeof(struct ext2_dirent),
 811                              filename, dir->namelen) == 0)) {
 812                         printf("file found, deleting\n");
 813                         inodeno = le32_to_cpu(dir->inode);
 814                         if (previous_dir) {
 815                                 uint16_t new_len;
 816                                 new_len = le16_to_cpu(previous_dir->direntlen);
 817                                 new_len += le16_to_cpu(dir->direntlen);
 818                                 previous_dir->direntlen = cpu_to_le16(new_len);
 819                         } else {
 820                                 dir->inode = 0;
 821                         }
 822                         found = 1;
 823                         break;
 824                 }
 825
 826                 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen))
 827                         break;
 828
 829                 /* traversing the each directory entry */
 830                 templength = le16_to_cpu(dir->direntlen);
 831                 totalbytes = totalbytes + templength;
 832                 previous_dir = dir;
 833                 dir = (struct ext2_dirent *)((char *)dir + templength);
 834                 ptr = (char *)dir;
 835         }
 836
 837
 838         if (found == 1) {
 839                 if (ext4fs_put_metadata(root_first_block_buffer, blknr))
 840                         goto fail;
 841                 ret = inodeno;
 842         }
 843 fail:
 844         free(root_first_block_buffer);
 845
 846         return ret;
 847 }
 848
 849 int ext4fs_filename_unlink(char *filename)
 850 {
 851         short direct_blk_idx = 0;
 852         long int blknr = -1;
 853         int inodeno = -1;
 854
 855         /* read the block no allocated to a file */
 856         for (direct_blk_idx = 0; direct_blk_idx < INDIRECT_BLOCKS;
 857                 direct_blk_idx++) {
 858                 blknr = read_allocated_block(g_parent_inode, direct_blk_idx);
 859                 if (blknr == 0)
 860                         break;
 861                 inodeno = unlink_filename(filename, blknr);
 862                 if (inodeno != -1)
 863                         return inodeno;
 864         }
 865
 866         return -1;
 867 }
 868
 869 uint32_t ext4fs_get_new_blk_no(void)
 870 {
 871         short i;
 872         short status;
 873         int remainder;
 874         unsigned int bg_idx;
 875         static int prev_bg_bitmap_index = -1;
 876         unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 877         struct ext_filesystem *fs = get_fs();
 878         char *journal_buffer = zalloc(fs->blksz);
 879         char *zero_buffer = zalloc(fs->blksz);
 880         if (!journal_buffer || !zero_buffer)
 881                 goto fail;
 882         struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
 883
 884         if (fs->first_pass_bbmap == 0) {
 885                 for (i = 0; i < fs->no_blkgrp; i++) {
 886                         if (le16_to_cpu(bgd[i].free_blocks)) {
 887                                 if (le16_to_cpu(bgd[i].bg_flags) & EXT4_BG_BLOCK_UNINIT) {
 888                                         uint16_t new_flags;
 889                                         put_ext4((uint64_t)le32_to_cpu(bgd[i].block_id) * fs->blksz,
 890                                                  zero_buffer, fs->blksz);
 891                                         new_flags = le16_to_cpu(bgd[i].bg_flags) & ~EXT4_BG_BLOCK_UNINIT;
 892                                         bgd[i].bg_flags = cpu_to_le16(new_flags);
 893                                         memcpy(fs->blk_bmaps[i], zero_buffer,
 894                                                fs->blksz);
 895                                 }
 896                                 fs->curr_blkno =
 897                                     _get_new_blk_no(fs->blk_bmaps[i]);
 898                                 if (fs->curr_blkno == -1)
 899                                         /* if block bitmap is completely fill */
 900                                         continue;
 901                                 fs->curr_blkno = fs->curr_blkno +
 902                                                 (i * fs->blksz * 8);
 903                                 fs->first_pass_bbmap++;
 904                                 ext4fs_bg_free_blocks_dec(&bgd[i]);
 905                                 ext4fs_sb_free_blocks_dec(fs->sb);
 906                                 status = ext4fs_devread(
 907                                                         (lbaint_t)le32_to_cpu(bgd[i].block_id) *
 908                                                         fs->sect_perblk, 0,
 909                                                         fs->blksz,
 910                                                         journal_buffer);
 911                                 if (status == 0)
 912                                         goto fail;
 913                                 if (ext4fs_log_journal(journal_buffer,
 914                                                         le32_to_cpu(bgd[i].block_id)))
 915                                         goto fail;
 916                                 goto success;
 917                         } else {
 918                                 debug("no space left on block group %d\n", i);
 919                         }
 920                 }
 921
 922                 goto fail;
 923         } else {
 924 restart:
 925                 fs->curr_blkno++;
 926                 /* get the blockbitmap index respective to blockno */
 927                 bg_idx = fs->curr_blkno / blk_per_grp;
 928                 if (fs->blksz == 1024) {
 929                         remainder = fs->curr_blkno % blk_per_grp;
 930                         if (!remainder)
 931                                 bg_idx--;
 932                 }
 933
 934                 /*
 935                  * To skip completely filled block group bitmaps
 936                  * Optimize the block allocation
 937                  */
 938                 if (bg_idx >= fs->no_blkgrp)
 939                         goto fail;
 940
 941                 if (bgd[bg_idx].free_blocks == 0) {
 942                         debug("block group %u is full. Skipping\n", bg_idx);
 943                         fs->curr_blkno = fs->curr_blkno + blk_per_grp;
 944                         fs->curr_blkno--;
 945                         goto restart;
 946                 }
 947
 948                 if (le16_to_cpu(bgd[bg_idx].bg_flags) & EXT4_BG_BLOCK_UNINIT) {
 949                         uint16_t new_flags;
 950                         memset(zero_buffer, '\0', fs->blksz);
 951                         put_ext4((uint64_t)le32_to_cpu(bgd[bg_idx].block_id) * fs->blksz,
 952                                  zero_buffer, fs->blksz);
 953                         memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
 954                         new_flags = le16_to_cpu(bgd[bg_idx].bg_flags) & ~EXT4_BG_BLOCK_UNINIT;
 955                         bgd[bg_idx].bg_flags = cpu_to_le16(new_flags);
 956                 }
 957
 958                 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
 959                                    bg_idx) != 0) {
 960                         debug("going for restart for the block no %ld %u\n",
 961                               fs->curr_blkno, bg_idx);
 962                         goto restart;
 963                 }
 964
 965                 /* journal backup */
 966                 if (prev_bg_bitmap_index != bg_idx) {
 967                         memset(journal_buffer, '\0', fs->blksz);
 968                         status = ext4fs_devread(
 969                                                 (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id)
 970                                                 * fs->sect_perblk,
 971                                                 0, fs->blksz, journal_buffer);
 972                         if (status == 0)
 973                                 goto fail;
 974                         if (ext4fs_log_journal(journal_buffer,
 975                                                 le32_to_cpu(bgd[bg_idx].block_id)))
 976                                 goto fail;
 977
 978                         prev_bg_bitmap_index = bg_idx;
 979                 }
 980                 ext4fs_bg_free_blocks_dec(&bgd[bg_idx]);
 981                 ext4fs_sb_free_blocks_dec(fs->sb);
 982                 goto success;
 983         }
 984 success:
 985         free(journal_buffer);
 986         free(zero_buffer);
 987
 988         return fs->curr_blkno;
 989 fail:
 990         free(journal_buffer);
 991         free(zero_buffer);
 992
 993         return -1;
 994 }
 995
 996 int ext4fs_get_new_inode_no(void)
 997 {
 998         short i;
 999         short status;
1000         unsigned int ibmap_idx;
1001         static int prev_inode_bitmap_index = -1;
1002         unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
1003         struct ext_filesystem *fs = get_fs();
1004         char *journal_buffer = zalloc(fs->blksz);
1005         char *zero_buffer = zalloc(fs->blksz);
1006         if (!journal_buffer || !zero_buffer)
1007                 goto fail;
1008         struct ext2_block_group *bgd = (struct ext2_block_group *)fs->gdtable;
1009
1010         if (fs->first_pass_ibmap == 0) {
1011                 for (i = 0; i < fs->no_blkgrp; i++) {
1012                         if (bgd[i].free_inodes) {
1013                                 if (bgd[i].bg_itable_unused !=
1014                                                 bgd[i].free_inodes)
1015                                         bgd[i].bg_itable_unused =
1016                                                 bgd[i].free_inodes;
1017                                 if (le16_to_cpu(bgd[i].bg_flags) & EXT4_BG_INODE_UNINIT) {
1018                                         int new_flags;
1019                                         put_ext4((uint64_t)le32_to_cpu(bgd[i].inode_id) * fs->blksz,
1020                                                  zero_buffer, fs->blksz);
1021                                         new_flags = le16_to_cpu(bgd[i].bg_flags) & ~EXT4_BG_INODE_UNINIT;
1022                                         bgd[i].bg_flags = cpu_to_le16(new_flags);
1023                                         memcpy(fs->inode_bmaps[i],
1024                                                zero_buffer, fs->blksz);
1025                                 }
1026                                 fs->curr_inode_no =
1027                                     _get_new_inode_no(fs->inode_bmaps[i]);
1028                                 if (fs->curr_inode_no == -1)
1029                                         /* if block bitmap is completely fill */
1030                                         continue;
1031                                 fs->curr_inode_no = fs->curr_inode_no +
1032                                                         (i * inodes_per_grp);
1033                                 fs->first_pass_ibmap++;
1034                                 ext4fs_bg_free_inodes_dec(&bgd[i]);
1035                                 ext4fs_bg_itable_unused_dec(&bgd[i]);
1036                                 ext4fs_sb_free_inodes_dec(fs->sb);
1037                                 status = ext4fs_devread(
1038                                                         (lbaint_t)le32_to_cpu(bgd[i].inode_id) *
1039                                                         fs->sect_perblk, 0,
1040                                                         fs->blksz,
1041                                                         journal_buffer);
1042                                 if (status == 0)
1043                                         goto fail;
1044                                 if (ext4fs_log_journal(journal_buffer,
1045                                                         le32_to_cpu(bgd[i].inode_id)))
1046                                         goto fail;
1047                                 goto success;
1048                         } else
1049                                 debug("no inode left on block group %d\n", i);
1050                 }
1051                 goto fail;
1052         } else {
1053 restart:
1054                 fs->curr_inode_no++;
1055                 /* get the blockbitmap index respective to blockno */
1056                 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1057                 if (le16_to_cpu(bgd[ibmap_idx].bg_flags) & EXT4_BG_INODE_UNINIT) {
1058                         int new_flags;
1059                         memset(zero_buffer, '\0', fs->blksz);
1060                         put_ext4((uint64_t)le32_to_cpu(bgd[ibmap_idx].inode_id) * fs->blksz,
1061                                  zero_buffer, fs->blksz);
1062                         new_flags = le16_to_cpu(bgd[ibmap_idx].bg_flags) & ~EXT4_BG_INODE_UNINIT;
1063                         bgd[ibmap_idx].bg_flags = cpu_to_le16(new_flags);
1064                         memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1065                                 fs->blksz);
1066                 }
1067
1068                 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1069                                           fs->inode_bmaps[ibmap_idx],
1070                                           ibmap_idx) != 0) {
1071                         debug("going for restart for the block no %d %u\n",
1072                               fs->curr_inode_no, ibmap_idx);
1073                         goto restart;
1074                 }
1075
1076                 /* journal backup */
1077                 if (prev_inode_bitmap_index != ibmap_idx) {
1078                         memset(journal_buffer, '\0', fs->blksz);
1079                         status = ext4fs_devread(
1080                                                 (lbaint_t)le32_to_cpu(bgd[ibmap_idx].inode_id)
1081                                                 * fs->sect_perblk,
1082                                                 0, fs->blksz, journal_buffer);
1083                         if (status == 0)
1084                                 goto fail;
1085                         if (ext4fs_log_journal(journal_buffer,
1086                                                 le32_to_cpu(bgd[ibmap_idx].inode_id)))
1087                                 goto fail;
1088                         prev_inode_bitmap_index = ibmap_idx;
1089                 }
1090                 if (bgd[ibmap_idx].bg_itable_unused !=
1091                                 bgd[ibmap_idx].free_inodes)
1092                         bgd[ibmap_idx].bg_itable_unused =
1093                                         bgd[ibmap_idx].free_inodes;
1094                 ext4fs_bg_free_inodes_dec(&bgd[ibmap_idx]);
1095                 ext4fs_bg_itable_unused_dec(&bgd[ibmap_idx]);
1096                 ext4fs_sb_free_inodes_dec(fs->sb);
1097                 goto success;
1098         }
1099
1100 success:
1101         free(journal_buffer);
1102         free(zero_buffer);
1103
1104         return fs->curr_inode_no;
1105 fail:
1106         free(journal_buffer);
1107         free(zero_buffer);
1108
1109         return -1;
1110
1111 }
1112
1113
1114 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1115                                         unsigned int *total_remaining_blocks,
1116                                         unsigned int *no_blks_reqd)
1117 {
1118         short i;
1119         short status;
1120         long int actual_block_no;
1121         long int si_blockno;
1122         /* si :single indirect */
1123         __le32 *si_buffer = NULL;
1124         __le32 *si_start_addr = NULL;
1125         struct ext_filesystem *fs = get_fs();
1126
1127         if (*total_remaining_blocks != 0) {
1128                 si_buffer = zalloc(fs->blksz);
1129                 if (!si_buffer) {
1130                         printf("No Memory\n");
1131                         return;
1132                 }
1133                 si_start_addr = si_buffer;
1134                 si_blockno = ext4fs_get_new_blk_no();
1135                 if (si_blockno == -1) {
1136                         printf("no block left to assign\n");
1137                         goto fail;
1138                 }
1139                 (*no_blks_reqd)++;
1140                 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1141
1142                 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1143                                         0, fs->blksz, (char *)si_buffer);
1144                 memset(si_buffer, '\0', fs->blksz);
1145                 if (status == 0)
1146                         goto fail;
1147
1148                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1149                         actual_block_no = ext4fs_get_new_blk_no();
1150                         if (actual_block_no == -1) {
1151                                 printf("no block left to assign\n");
1152                                 goto fail;
1153                         }
1154                         *si_buffer = cpu_to_le32(actual_block_no);
1155                         debug("SIAB %u: %u\n", *si_buffer,
1156                                 *total_remaining_blocks);
1157
1158                         si_buffer++;
1159                         (*total_remaining_blocks)--;
1160                         if (*total_remaining_blocks == 0)
1161                                 break;
1162                 }
1163
1164                 /* write the block to disk */
1165                 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1166                          si_start_addr, fs->blksz);
1167                 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1168         }
1169 fail:
1170         free(si_start_addr);
1171 }
1172
1173 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1174                                         unsigned int *total_remaining_blocks,
1175                                         unsigned int *no_blks_reqd)
1176 {
1177         short i;
1178         short j;
1179         short status;
1180         long int actual_block_no;
1181         /* di:double indirect */
1182         long int di_blockno_parent;
1183         long int di_blockno_child;
1184         __le32 *di_parent_buffer = NULL;
1185         __le32 *di_child_buff = NULL;
1186         __le32 *di_block_start_addr = NULL;
1187         __le32 *di_child_buff_start = NULL;
1188         struct ext_filesystem *fs = get_fs();
1189
1190         if (*total_remaining_blocks != 0) {
1191                 /* double indirect parent block connecting to inode */
1192                 di_blockno_parent = ext4fs_get_new_blk_no();
1193                 if (di_blockno_parent == -1) {
1194                         printf("no block left to assign\n");
1195                         goto fail;
1196                 }
1197                 di_parent_buffer = zalloc(fs->blksz);
1198                 if (!di_parent_buffer)
1199                         goto fail;
1200
1201                 di_block_start_addr = di_parent_buffer;
1202                 (*no_blks_reqd)++;
1203                 debug("DIPB %ld: %u\n", di_blockno_parent,
1204                       *total_remaining_blocks);
1205
1206                 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1207                                         fs->sect_perblk, 0,
1208                                         fs->blksz, (char *)di_parent_buffer);
1209
1210                 if (!status) {
1211                         printf("%s: Device read error!\n", __func__);
1212                         goto fail;
1213                 }
1214                 memset(di_parent_buffer, '\0', fs->blksz);
1215
1216                 /*
1217                  * start:for each double indirect parent
1218                  * block create one more block
1219                  */
1220                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1221                         di_blockno_child = ext4fs_get_new_blk_no();
1222                         if (di_blockno_child == -1) {
1223                                 printf("no block left to assign\n");
1224                                 goto fail;
1225                         }
1226                         di_child_buff = zalloc(fs->blksz);
1227                         if (!di_child_buff)
1228                                 goto fail;
1229
1230                         di_child_buff_start = di_child_buff;
1231                         *di_parent_buffer = cpu_to_le32(di_blockno_child);
1232                         di_parent_buffer++;
1233                         (*no_blks_reqd)++;
1234                         debug("DICB %ld: %u\n", di_blockno_child,
1235                               *total_remaining_blocks);
1236
1237                         status = ext4fs_devread((lbaint_t)di_blockno_child *
1238                                                 fs->sect_perblk, 0,
1239                                                 fs->blksz,
1240                                                 (char *)di_child_buff);
1241
1242                         if (!status) {
1243                                 printf("%s: Device read error!\n", __func__);
1244                                 goto fail;
1245                         }
1246                         memset(di_child_buff, '\0', fs->blksz);
1247                         /* filling of actual datablocks for each child */
1248                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1249                                 actual_block_no = ext4fs_get_new_blk_no();
1250                                 if (actual_block_no == -1) {
1251                                         printf("no block left to assign\n");
1252                                         goto fail;
1253                                 }
1254                                 *di_child_buff = cpu_to_le32(actual_block_no);
1255                                 debug("DIAB %ld: %u\n", actual_block_no,
1256                                       *total_remaining_blocks);
1257
1258                                 di_child_buff++;
1259                                 (*total_remaining_blocks)--;
1260                                 if (*total_remaining_blocks == 0)
1261                                         break;
1262                         }
1263                         /* write the block  table */
1264                         put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1265                                  di_child_buff_start, fs->blksz);
1266                         free(di_child_buff_start);
1267                         di_child_buff_start = NULL;
1268
1269                         if (*total_remaining_blocks == 0)
1270                                 break;
1271                 }
1272                 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1273                          di_block_start_addr, fs->blksz);
1274                 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1275         }
1276 fail:
1277         free(di_block_start_addr);
1278 }
1279
1280 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1281                                         unsigned int *total_remaining_blocks,
1282                                         unsigned int *no_blks_reqd)
1283 {
1284         short i;
1285         short j;
1286         short k;
1287         long int actual_block_no;
1288         /* ti: Triple Indirect */
1289         long int ti_gp_blockno;
1290         long int ti_parent_blockno;
1291         long int ti_child_blockno;
1292         __le32 *ti_gp_buff = NULL;
1293         __le32 *ti_parent_buff = NULL;
1294         __le32 *ti_child_buff = NULL;
1295         __le32 *ti_gp_buff_start_addr = NULL;
1296         __le32 *ti_pbuff_start_addr = NULL;
1297         __le32 *ti_cbuff_start_addr = NULL;
1298         struct ext_filesystem *fs = get_fs();
1299         if (*total_remaining_blocks != 0) {
1300                 /* triple indirect grand parent block connecting to inode */
1301                 ti_gp_blockno = ext4fs_get_new_blk_no();
1302                 if (ti_gp_blockno == -1) {
1303                         printf("no block left to assign\n");
1304                         return;
1305                 }
1306                 ti_gp_buff = zalloc(fs->blksz);
1307                 if (!ti_gp_buff)
1308                         return;
1309
1310                 ti_gp_buff_start_addr = ti_gp_buff;
1311                 (*no_blks_reqd)++;
1312                 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1313                       *total_remaining_blocks);
1314
1315                 /* for each 4 byte grand parent entry create one more block */
1316                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1317                         ti_parent_blockno = ext4fs_get_new_blk_no();
1318                         if (ti_parent_blockno == -1) {
1319                                 printf("no block left to assign\n");
1320                                 goto fail;
1321                         }
1322                         ti_parent_buff = zalloc(fs->blksz);
1323                         if (!ti_parent_buff)
1324                                 goto fail;
1325
1326                         ti_pbuff_start_addr = ti_parent_buff;
1327                         *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1328                         ti_gp_buff++;
1329                         (*no_blks_reqd)++;
1330                         debug("TIPB %ld: %u\n", ti_parent_blockno,
1331                               *total_remaining_blocks);
1332
1333                         /* for each 4 byte entry parent create one more block */
1334                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1335                                 ti_child_blockno = ext4fs_get_new_blk_no();
1336                                 if (ti_child_blockno == -1) {
1337                                         printf("no block left assign\n");
1338                                         goto fail1;
1339                                 }
1340                                 ti_child_buff = zalloc(fs->blksz);
1341                                 if (!ti_child_buff)
1342                                         goto fail1;
1343
1344                                 ti_cbuff_start_addr = ti_child_buff;
1345                                 *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1346                                 ti_parent_buff++;
1347                                 (*no_blks_reqd)++;
1348                                 debug("TICB %ld: %u\n", ti_parent_blockno,
1349                                       *total_remaining_blocks);
1350
1351                                 /* fill actual datablocks for each child */
1352                                 for (k = 0; k < (fs->blksz / sizeof(int));
1353                                         k++) {
1354                                         actual_block_no =
1355                                             ext4fs_get_new_blk_no();
1356                                         if (actual_block_no == -1) {
1357                                                 printf("no block left\n");
1358                                                 free(ti_cbuff_start_addr);
1359                                                 goto fail1;
1360                                         }
1361                                         *ti_child_buff = cpu_to_le32(actual_block_no);
1362                                         debug("TIAB %ld: %u\n", actual_block_no,
1363                                               *total_remaining_blocks);
1364
1365                                         ti_child_buff++;
1366                                         (*total_remaining_blocks)--;
1367                                         if (*total_remaining_blocks == 0)
1368                                                 break;
1369                                 }
1370                                 /* write the child block */
1371                                 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1372                                                       (uint64_t)fs->blksz)),
1373                                          ti_cbuff_start_addr, fs->blksz);
1374                                 free(ti_cbuff_start_addr);
1375
1376                                 if (*total_remaining_blocks == 0)
1377                                         break;
1378                         }
1379                         /* write the parent block */
1380                         put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1381                                  ti_pbuff_start_addr, fs->blksz);
1382                         free(ti_pbuff_start_addr);
1383
1384                         if (*total_remaining_blocks == 0)
1385                                 break;
1386                 }
1387                 /* write the grand parent block */
1388                 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1389                          ti_gp_buff_start_addr, fs->blksz);
1390                 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1391                 free(ti_gp_buff_start_addr);
1392                 return;
1393         }
1394 fail1:
1395         free(ti_pbuff_start_addr);
1396 fail:
1397         free(ti_gp_buff_start_addr);
1398 }
1399
1400 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1401                                 unsigned int total_remaining_blocks,
1402                                 unsigned int *total_no_of_block)
1403 {
1404         short i;
1405         long int direct_blockno;
1406         unsigned int no_blks_reqd = 0;
1407
1408         /* allocation of direct blocks */
1409         for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1410                 direct_blockno = ext4fs_get_new_blk_no();
1411                 if (direct_blockno == -1) {
1412                         printf("no block left to assign\n");
1413                         return;
1414                 }
1415                 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1416                 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1417
1418                 total_remaining_blocks--;
1419         }
1420
1421         alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1422                                     &no_blks_reqd);
1423         alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1424                                     &no_blks_reqd);
1425         alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1426                                     &no_blks_reqd);
1427         *total_no_of_block += no_blks_reqd;
1428 }
1429
1430 #endif
1431
1432 static struct ext4_extent_header *ext4fs_get_extent_block
1433         (struct ext2_data *data, char *buf,
1434                 struct ext4_extent_header *ext_block,
1435                 uint32_t fileblock, int log2_blksz)
1436 {
1437         struct ext4_extent_idx *index;
1438         unsigned long long block;
1439         int blksz = EXT2_BLOCK_SIZE(data);
1440         int i;
1441
1442         while (1) {
1443                 index = (struct ext4_extent_idx *)(ext_block + 1);
1444
1445                 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1446                         return NULL;
1447
1448                 if (ext_block->eh_depth == 0)
1449                         return ext_block;
1450                 i = -1;
1451                 do {
1452                         i++;
1453                         if (i >= le16_to_cpu(ext_block->eh_entries))
1454                                 break;
1455                 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1456
1457                 if (--i < 0)
1458                         return NULL;
1459
1460                 block = le16_to_cpu(index[i].ei_leaf_hi);
1461                 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1462
1463                 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1464                                    buf))
1465                         ext_block = (struct ext4_extent_header *)buf;
1466                 else
1467                         return NULL;
1468         }
1469 }
1470
1471 static int ext4fs_blockgroup
1472         (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1473 {
1474         long int blkno;
1475         unsigned int blkoff, desc_per_blk;
1476         int log2blksz = get_fs()->dev_desc->log2blksz;
1477
1478         desc_per_blk = EXT2_BLOCK_SIZE(data) / sizeof(struct ext2_block_group);
1479
1480         blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1481                         group / desc_per_blk;
1482         blkoff = (group % desc_per_blk) * sizeof(struct ext2_block_group);
1483
1484         debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1485               group, blkno, blkoff);
1486
1487         return ext4fs_devread((lbaint_t)blkno <<
1488                               (LOG2_BLOCK_SIZE(data) - log2blksz),
1489                               blkoff, sizeof(struct ext2_block_group),
1490                               (char *)blkgrp);
1491 }
1492
1493 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1494 {
1495         struct ext2_block_group blkgrp;
1496         struct ext2_sblock *sblock = &data->sblock;
1497         struct ext_filesystem *fs = get_fs();
1498         int log2blksz = get_fs()->dev_desc->log2blksz;
1499         int inodes_per_block, status;
1500         long int blkno;
1501         unsigned int blkoff;
1502
1503         /* It is easier to calculate if the first inode is 0. */
1504         ino--;
1505         status = ext4fs_blockgroup(data, ino / le32_to_cpu
1506                                    (sblock->inodes_per_group), &blkgrp);
1507         if (status == 0)
1508                 return 0;
1509
1510         inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1511         blkno = le32_to_cpu(blkgrp.inode_table_id) +
1512             (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1513         blkoff = (ino % inodes_per_block) * fs->inodesz;
1514         /* Read the inode. */
1515         status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1516                                 log2blksz), blkoff,
1517                                 sizeof(struct ext2_inode), (char *)inode);
1518         if (status == 0)
1519                 return 0;
1520
1521         return 1;
1522 }
1523
1524 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1525 {
1526         long int blknr;
1527         int blksz;
1528         int log2_blksz;
1529         int status;
1530         long int rblock;
1531         long int perblock_parent;
1532         long int perblock_child;
1533         unsigned long long start;
1534         /* get the blocksize of the filesystem */
1535         blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1536         log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1537                 - get_fs()->dev_desc->log2blksz;
1538
1539         if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1540                 char *buf = zalloc(blksz);
1541                 if (!buf)
1542                         return -ENOMEM;
1543                 struct ext4_extent_header *ext_block;
1544                 struct ext4_extent *extent;
1545                 int i = -1;
1546                 ext_block =
1547                         ext4fs_get_extent_block(ext4fs_root, buf,
1548                                                 (struct ext4_extent_header *)
1549                                                 inode->b.blocks.dir_blocks,
1550                                                 fileblock, log2_blksz);
1551                 if (!ext_block) {
1552                         printf("invalid extent block\n");
1553                         free(buf);
1554                         return -EINVAL;
1555                 }
1556
1557                 extent = (struct ext4_extent *)(ext_block + 1);
1558
1559                 do {
1560                         i++;
1561                         if (i >= le16_to_cpu(ext_block->eh_entries))
1562                                 break;
1563                 } while (fileblock >= le32_to_cpu(extent[i].ee_block));
1564                 if (--i >= 0) {
1565                         fileblock -= le32_to_cpu(extent[i].ee_block);
1566                         if (fileblock >= le16_to_cpu(extent[i].ee_len)) {
1567                                 free(buf);
1568                                 return 0;
1569                         }
1570
1571                         start = le16_to_cpu(extent[i].ee_start_hi);
1572                         start = (start << 32) +
1573                                         le32_to_cpu(extent[i].ee_start_lo);
1574                         free(buf);
1575                         return fileblock + start;
1576                 }
1577
1578                 printf("Extent Error\n");
1579                 free(buf);
1580                 return -1;
1581         }
1582
1583         /* Direct blocks. */
1584         if (fileblock < INDIRECT_BLOCKS)
1585                 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1586
1587         /* Indirect. */
1588         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1589                 if (ext4fs_indir1_block == NULL) {
1590                         ext4fs_indir1_block = zalloc(blksz);
1591                         if (ext4fs_indir1_block == NULL) {
1592                                 printf("** SI ext2fs read block (indir 1)"
1593                                         "malloc failed. **\n");
1594                                 return -1;
1595                         }
1596                         ext4fs_indir1_size = blksz;
1597                         ext4fs_indir1_blkno = -1;
1598                 }
1599                 if (blksz != ext4fs_indir1_size) {
1600                         free(ext4fs_indir1_block);
1601                         ext4fs_indir1_block = NULL;
1602                         ext4fs_indir1_size = 0;
1603                         ext4fs_indir1_blkno = -1;
1604                         ext4fs_indir1_block = zalloc(blksz);
1605                         if (ext4fs_indir1_block == NULL) {
1606                                 printf("** SI ext2fs read block (indir 1):"
1607                                         "malloc failed. **\n");
1608                                 return -1;
1609                         }
1610                         ext4fs_indir1_size = blksz;
1611                 }
1612                 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1613                      log2_blksz) != ext4fs_indir1_blkno) {
1614                         status =
1615                             ext4fs_devread((lbaint_t)le32_to_cpu
1616                                            (inode->b.blocks.
1617                                             indir_block) << log2_blksz, 0,
1618                                            blksz, (char *)ext4fs_indir1_block);
1619                         if (status == 0) {
1620                                 printf("** SI ext2fs read block (indir 1)"
1621                                         "failed. **\n");
1622                                 return 0;
1623                         }
1624                         ext4fs_indir1_blkno =
1625                                 le32_to_cpu(inode->b.blocks.
1626                                                indir_block) << log2_blksz;
1627                 }
1628                 blknr = le32_to_cpu(ext4fs_indir1_block
1629                                       [fileblock - INDIRECT_BLOCKS]);
1630         }
1631         /* Double indirect. */
1632         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1633                                         (blksz / 4 + 1)))) {
1634
1635                 long int perblock = blksz / 4;
1636                 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1637
1638                 if (ext4fs_indir1_block == NULL) {
1639                         ext4fs_indir1_block = zalloc(blksz);
1640                         if (ext4fs_indir1_block == NULL) {
1641                                 printf("** DI ext2fs read block (indir 2 1)"
1642                                         "malloc failed. **\n");
1643                                 return -1;
1644                         }
1645                         ext4fs_indir1_size = blksz;
1646                         ext4fs_indir1_blkno = -1;
1647                 }
1648                 if (blksz != ext4fs_indir1_size) {
1649                         free(ext4fs_indir1_block);
1650                         ext4fs_indir1_block = NULL;
1651                         ext4fs_indir1_size = 0;
1652                         ext4fs_indir1_blkno = -1;
1653                         ext4fs_indir1_block = zalloc(blksz);
1654                         if (ext4fs_indir1_block == NULL) {
1655                                 printf("** DI ext2fs read block (indir 2 1)"
1656                                         "malloc failed. **\n");
1657                                 return -1;
1658                         }
1659                         ext4fs_indir1_size = blksz;
1660                 }
1661                 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1662                      log2_blksz) != ext4fs_indir1_blkno) {
1663                         status =
1664                             ext4fs_devread((lbaint_t)le32_to_cpu
1665                                            (inode->b.blocks.
1666                                             double_indir_block) << log2_blksz,
1667                                            0, blksz,
1668                                            (char *)ext4fs_indir1_block);
1669                         if (status == 0) {
1670                                 printf("** DI ext2fs read block (indir 2 1)"
1671                                         "failed. **\n");
1672                                 return -1;
1673                         }
1674                         ext4fs_indir1_blkno =
1675                             le32_to_cpu(inode->b.blocks.double_indir_block) <<
1676                             log2_blksz;
1677                 }
1678
1679                 if (ext4fs_indir2_block == NULL) {
1680                         ext4fs_indir2_block = zalloc(blksz);
1681                         if (ext4fs_indir2_block == NULL) {
1682                                 printf("** DI ext2fs read block (indir 2 2)"
1683                                         "malloc failed. **\n");
1684                                 return -1;
1685                         }
1686                         ext4fs_indir2_size = blksz;
1687                         ext4fs_indir2_blkno = -1;
1688                 }
1689                 if (blksz != ext4fs_indir2_size) {
1690                         free(ext4fs_indir2_block);
1691                         ext4fs_indir2_block = NULL;
1692                         ext4fs_indir2_size = 0;
1693                         ext4fs_indir2_blkno = -1;
1694                         ext4fs_indir2_block = zalloc(blksz);
1695                         if (ext4fs_indir2_block == NULL) {
1696                                 printf("** DI ext2fs read block (indir 2 2)"
1697                                         "malloc failed. **\n");
1698                                 return -1;
1699                         }
1700                         ext4fs_indir2_size = blksz;
1701                 }
1702                 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1703                      log2_blksz) != ext4fs_indir2_blkno) {
1704                         status = ext4fs_devread((lbaint_t)le32_to_cpu
1705                                                 (ext4fs_indir1_block
1706                                                  [rblock /
1707                                                   perblock]) << log2_blksz, 0,
1708                                                 blksz,
1709                                                 (char *)ext4fs_indir2_block);
1710                         if (status == 0) {
1711                                 printf("** DI ext2fs read block (indir 2 2)"
1712                                         "failed. **\n");
1713                                 return -1;
1714                         }
1715                         ext4fs_indir2_blkno =
1716                             le32_to_cpu(ext4fs_indir1_block[rblock
1717                                                               /
1718                                                               perblock]) <<
1719                             log2_blksz;
1720                 }
1721                 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1722         }
1723         /* Tripple indirect. */
1724         else {
1725                 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1726                                       (blksz / 4 * blksz / 4));
1727                 perblock_child = blksz / 4;
1728                 perblock_parent = ((blksz / 4) * (blksz / 4));
1729
1730                 if (ext4fs_indir1_block == NULL) {
1731                         ext4fs_indir1_block = zalloc(blksz);
1732                         if (ext4fs_indir1_block == NULL) {
1733                                 printf("** TI ext2fs read block (indir 2 1)"
1734                                         "malloc failed. **\n");
1735                                 return -1;
1736                         }
1737                         ext4fs_indir1_size = blksz;
1738                         ext4fs_indir1_blkno = -1;
1739                 }
1740                 if (blksz != ext4fs_indir1_size) {
1741                         free(ext4fs_indir1_block);
1742                         ext4fs_indir1_block = NULL;
1743                         ext4fs_indir1_size = 0;
1744                         ext4fs_indir1_blkno = -1;
1745                         ext4fs_indir1_block = zalloc(blksz);
1746                         if (ext4fs_indir1_block == NULL) {
1747                                 printf("** TI ext2fs read block (indir 2 1)"
1748                                         "malloc failed. **\n");
1749                                 return -1;
1750                         }
1751                         ext4fs_indir1_size = blksz;
1752                 }
1753                 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1754                      log2_blksz) != ext4fs_indir1_blkno) {
1755                         status = ext4fs_devread
1756                             ((lbaint_t)
1757                              le32_to_cpu(inode->b.blocks.triple_indir_block)
1758                              << log2_blksz, 0, blksz,
1759                              (char *)ext4fs_indir1_block);
1760                         if (status == 0) {
1761                                 printf("** TI ext2fs read block (indir 2 1)"
1762                                         "failed. **\n");
1763                                 return -1;
1764                         }
1765                         ext4fs_indir1_blkno =
1766                             le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1767                             log2_blksz;
1768                 }
1769
1770                 if (ext4fs_indir2_block == NULL) {
1771                         ext4fs_indir2_block = zalloc(blksz);
1772                         if (ext4fs_indir2_block == NULL) {
1773                                 printf("** TI ext2fs read block (indir 2 2)"
1774                                         "malloc failed. **\n");
1775                                 return -1;
1776                         }
1777                         ext4fs_indir2_size = blksz;
1778                         ext4fs_indir2_blkno = -1;
1779                 }
1780                 if (blksz != ext4fs_indir2_size) {
1781                         free(ext4fs_indir2_block);
1782                         ext4fs_indir2_block = NULL;
1783                         ext4fs_indir2_size = 0;
1784                         ext4fs_indir2_blkno = -1;
1785                         ext4fs_indir2_block = zalloc(blksz);
1786                         if (ext4fs_indir2_block == NULL) {
1787                                 printf("** TI ext2fs read block (indir 2 2)"
1788                                         "malloc failed. **\n");
1789                                 return -1;
1790                         }
1791                         ext4fs_indir2_size = blksz;
1792                 }
1793                 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1794                                                        perblock_parent]) <<
1795                      log2_blksz)
1796                     != ext4fs_indir2_blkno) {
1797                         status = ext4fs_devread((lbaint_t)le32_to_cpu
1798                                                 (ext4fs_indir1_block
1799                                                  [rblock /
1800                                                   perblock_parent]) <<
1801                                                 log2_blksz, 0, blksz,
1802                                                 (char *)ext4fs_indir2_block);
1803                         if (status == 0) {
1804                                 printf("** TI ext2fs read block (indir 2 2)"
1805                                         "failed. **\n");
1806                                 return -1;
1807                         }
1808                         ext4fs_indir2_blkno =
1809                             le32_to_cpu(ext4fs_indir1_block[rblock /
1810                                                               perblock_parent])
1811                             << log2_blksz;
1812                 }
1813
1814                 if (ext4fs_indir3_block == NULL) {
1815                         ext4fs_indir3_block = zalloc(blksz);
1816                         if (ext4fs_indir3_block == NULL) {
1817                                 printf("** TI ext2fs read block (indir 2 2)"
1818                                         "malloc failed. **\n");
1819                                 return -1;
1820                         }
1821                         ext4fs_indir3_size = blksz;
1822                         ext4fs_indir3_blkno = -1;
1823                 }
1824                 if (blksz != ext4fs_indir3_size) {
1825                         free(ext4fs_indir3_block);
1826                         ext4fs_indir3_block = NULL;
1827                         ext4fs_indir3_size = 0;
1828                         ext4fs_indir3_blkno = -1;
1829                         ext4fs_indir3_block = zalloc(blksz);
1830                         if (ext4fs_indir3_block == NULL) {
1831                                 printf("** TI ext2fs read block (indir 2 2)"
1832                                         "malloc failed. **\n");
1833                                 return -1;
1834                         }
1835                         ext4fs_indir3_size = blksz;
1836                 }
1837                 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1838                                                        /
1839                                                        perblock_child]) <<
1840                      log2_blksz) != ext4fs_indir3_blkno) {
1841                         status =
1842                             ext4fs_devread((lbaint_t)le32_to_cpu
1843                                            (ext4fs_indir2_block
1844                                             [(rblock / perblock_child)
1845                                              % (blksz / 4)]) << log2_blksz, 0,
1846                                            blksz, (char *)ext4fs_indir3_block);
1847                         if (status == 0) {
1848                                 printf("** TI ext2fs read block (indir 2 2)"
1849                                        "failed. **\n");
1850                                 return -1;
1851                         }
1852                         ext4fs_indir3_blkno =
1853                             le32_to_cpu(ext4fs_indir2_block[(rblock /
1854                                                                perblock_child) %
1855                                                               (blksz /
1856                                                                4)]) <<
1857                             log2_blksz;
1858                 }
1859
1860                 blknr = le32_to_cpu(ext4fs_indir3_block
1861                                       [rblock % perblock_child]);
1862         }
1863         debug("read_allocated_block %ld\n", blknr);
1864
1865         return blknr;
1866 }
1867
1868 /**
1869  * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1870  *                          global pointers
1871  *
1872  * This function assures that for a file with the same name but different size
1873  * the sequential store on the ext4 filesystem will be correct.
1874  *
1875  * In this function the global data, responsible for internal representation
1876  * of the ext4 data are initialized to the reset state. Without this, during
1877  * replacement of the smaller file with the bigger truncation of new file was
1878  * performed.
1879  */
1880 void ext4fs_reinit_global(void)
1881 {
1882         if (ext4fs_indir1_block != NULL) {
1883                 free(ext4fs_indir1_block);
1884                 ext4fs_indir1_block = NULL;
1885                 ext4fs_indir1_size = 0;
1886                 ext4fs_indir1_blkno = -1;
1887         }
1888         if (ext4fs_indir2_block != NULL) {
1889                 free(ext4fs_indir2_block);
1890                 ext4fs_indir2_block = NULL;
1891                 ext4fs_indir2_size = 0;
1892                 ext4fs_indir2_blkno = -1;
1893         }
1894         if (ext4fs_indir3_block != NULL) {
1895                 free(ext4fs_indir3_block);
1896                 ext4fs_indir3_block = NULL;
1897                 ext4fs_indir3_size = 0;
1898                 ext4fs_indir3_blkno = -1;
1899         }
1900 }
1901 void ext4fs_close(void)
1902 {
1903         if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1904                 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1905                 ext4fs_file = NULL;
1906         }
1907         if (ext4fs_root != NULL) {
1908                 free(ext4fs_root);
1909                 ext4fs_root = NULL;
1910         }
1911
1912         ext4fs_reinit_global();
1913 }
1914
1915 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1916                                 struct ext2fs_node **fnode, int *ftype)
1917 {
1918         unsigned int fpos = 0;
1919         int status;
1920         loff_t actread;
1921         struct ext2fs_node *diro = (struct ext2fs_node *) dir;
1922
1923 #ifdef DEBUG
1924         if (name != NULL)
1925                 printf("Iterate dir %s\n", name);
1926 #endif /* of DEBUG */
1927         if (!diro->inode_read) {
1928                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
1929                 if (status == 0)
1930                         return 0;
1931         }
1932         /* Search the file.  */
1933         while (fpos < le32_to_cpu(diro->inode.size)) {
1934                 struct ext2_dirent dirent;
1935
1936                 status = ext4fs_read_file(diro, fpos,
1937                                            sizeof(struct ext2_dirent),
1938                                            (char *)&dirent, &actread);
1939                 if (status < 0)
1940                         return 0;
1941
1942                 if (dirent.direntlen == 0) {
1943                         printf("Failed to iterate over directory %s\n", name);
1944                         return 0;
1945                 }
1946
1947                 if (dirent.namelen != 0) {
1948                         char filename[dirent.namelen + 1];
1949                         struct ext2fs_node *fdiro;
1950                         int type = FILETYPE_UNKNOWN;
1951
1952                         status = ext4fs_read_file(diro,
1953                                                   fpos +
1954                                                   sizeof(struct ext2_dirent),
1955                                                   dirent.namelen, filename,
1956                                                   &actread);
1957                         if (status < 0)
1958                                 return 0;
1959
1960                         fdiro = zalloc(sizeof(struct ext2fs_node));
1961                         if (!fdiro)
1962                                 return 0;
1963
1964                         fdiro->data = diro->data;
1965                         fdiro->ino = le32_to_cpu(dirent.inode);
1966
1967                         filename[dirent.namelen] = '\0';
1968
1969                         if (dirent.filetype != FILETYPE_UNKNOWN) {
1970                                 fdiro->inode_read = 0;
1971
1972                                 if (dirent.filetype == FILETYPE_DIRECTORY)
1973                                         type = FILETYPE_DIRECTORY;
1974                                 else if (dirent.filetype == FILETYPE_SYMLINK)
1975                                         type = FILETYPE_SYMLINK;
1976                                 else if (dirent.filetype == FILETYPE_REG)
1977                                         type = FILETYPE_REG;
1978                         } else {
1979                                 status = ext4fs_read_inode(diro->data,
1980                                                            le32_to_cpu
1981                                                            (dirent.inode),
1982                                                            &fdiro->inode);
1983                                 if (status == 0) {
1984                                         free(fdiro);
1985                                         return 0;
1986                                 }
1987                                 fdiro->inode_read = 1;
1988
1989                                 if ((le16_to_cpu(fdiro->inode.mode) &
1990                                      FILETYPE_INO_MASK) ==
1991                                     FILETYPE_INO_DIRECTORY) {
1992                                         type = FILETYPE_DIRECTORY;
1993                                 } else if ((le16_to_cpu(fdiro->inode.mode)
1994                                             & FILETYPE_INO_MASK) ==
1995                                            FILETYPE_INO_SYMLINK) {
1996                                         type = FILETYPE_SYMLINK;
1997                                 } else if ((le16_to_cpu(fdiro->inode.mode)
1998                                             & FILETYPE_INO_MASK) ==
1999                                            FILETYPE_INO_REG) {
2000                                         type = FILETYPE_REG;
2001                                 }
2002                         }
2003 #ifdef DEBUG
2004                         printf("iterate >%s<\n", filename);
2005 #endif /* of DEBUG */
2006                         if ((name != NULL) && (fnode != NULL)
2007                             && (ftype != NULL)) {
2008                                 if (strcmp(filename, name) == 0) {
2009                                         *ftype = type;
2010                                         *fnode = fdiro;
2011                                         return 1;
2012                                 }
2013                         } else {
2014                                 if (fdiro->inode_read == 0) {
2015                                         status = ext4fs_read_inode(diro->data,
2016                                                                  le32_to_cpu(
2017                                                                  dirent.inode),
2018                                                                  &fdiro->inode);
2019                                         if (status == 0) {
2020                                                 free(fdiro);
2021                                                 return 0;
2022                                         }
2023                                         fdiro->inode_read = 1;
2024                                 }
2025                                 switch (type) {
2026                                 case FILETYPE_DIRECTORY:
2027                                         printf("<DIR> ");
2028                                         break;
2029                                 case FILETYPE_SYMLINK:
2030                                         printf("<SYM> ");
2031                                         break;
2032                                 case FILETYPE_REG:
2033                                         printf("      ");
2034                                         break;
2035                                 default:
2036                                         printf("< ? > ");
2037                                         break;
2038                                 }
2039                                 printf("%10u %s\n",
2040                                        le32_to_cpu(fdiro->inode.size),
2041                                         filename);
2042                         }
2043                         free(fdiro);
2044                 }
2045                 fpos += le16_to_cpu(dirent.direntlen);
2046         }
2047         return 0;
2048 }
2049
2050 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2051 {
2052         char *symlink;
2053         struct ext2fs_node *diro = node;
2054         int status;
2055         loff_t actread;
2056
2057         if (!diro->inode_read) {
2058                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2059                 if (status == 0)
2060                         return NULL;
2061         }
2062         symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2063         if (!symlink)
2064                 return NULL;
2065
2066         if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2067                 strncpy(symlink, diro->inode.b.symlink,
2068                          le32_to_cpu(diro->inode.size));
2069         } else {
2070                 status = ext4fs_read_file(diro, 0,
2071                                            le32_to_cpu(diro->inode.size),
2072                                            symlink, &actread);
2073                 if ((status < 0) || (actread == 0)) {
2074                         free(symlink);
2075                         return NULL;
2076                 }
2077         }
2078         symlink[le32_to_cpu(diro->inode.size)] = '\0';
2079         return symlink;
2080 }
2081
2082 static int ext4fs_find_file1(const char *currpath,
2083                              struct ext2fs_node *currroot,
2084                              struct ext2fs_node **currfound, int *foundtype)
2085 {
2086         char fpath[strlen(currpath) + 1];
2087         char *name = fpath;
2088         char *next;
2089         int status;
2090         int type = FILETYPE_DIRECTORY;
2091         struct ext2fs_node *currnode = currroot;
2092         struct ext2fs_node *oldnode = currroot;
2093
2094         strncpy(fpath, currpath, strlen(currpath) + 1);
2095
2096         /* Remove all leading slashes. */
2097         while (*name == '/')
2098                 name++;
2099
2100         if (!*name) {
2101                 *currfound = currnode;
2102                 return 1;
2103         }
2104
2105         for (;;) {
2106                 int found;
2107
2108                 /* Extract the actual part from the pathname. */
2109                 next = strchr(name, '/');
2110                 if (next) {
2111                         /* Remove all leading slashes. */
2112                         while (*next == '/')
2113                                 *(next++) = '\0';
2114                 }
2115
2116                 if (type != FILETYPE_DIRECTORY) {
2117                         ext4fs_free_node(currnode, currroot);
2118                         return 0;
2119                 }
2120
2121                 oldnode = currnode;
2122
2123                 /* Iterate over the directory. */
2124                 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2125                 if (found == 0)
2126                         return 0;
2127
2128                 if (found == -1)
2129                         break;
2130
2131                 /* Read in the symlink and follow it. */
2132                 if (type == FILETYPE_SYMLINK) {
2133                         char *symlink;
2134
2135                         /* Test if the symlink does not loop. */
2136                         if (++symlinknest == 8) {
2137                                 ext4fs_free_node(currnode, currroot);
2138                                 ext4fs_free_node(oldnode, currroot);
2139                                 return 0;
2140                         }
2141
2142                         symlink = ext4fs_read_symlink(currnode);
2143                         ext4fs_free_node(currnode, currroot);
2144
2145                         if (!symlink) {
2146                                 ext4fs_free_node(oldnode, currroot);
2147                                 return 0;
2148                         }
2149
2150                         debug("Got symlink >%s<\n", symlink);
2151
2152                         if (symlink[0] == '/') {
2153                                 ext4fs_free_node(oldnode, currroot);
2154                                 oldnode = &ext4fs_root->diropen;
2155                         }
2156
2157                         /* Lookup the node the symlink points to. */
2158                         status = ext4fs_find_file1(symlink, oldnode,
2159                                                     &currnode, &type);
2160
2161                         free(symlink);
2162
2163                         if (status == 0) {
2164                                 ext4fs_free_node(oldnode, currroot);
2165                                 return 0;
2166                         }
2167                 }
2168
2169                 ext4fs_free_node(oldnode, currroot);
2170
2171                 /* Found the node! */
2172                 if (!next || *next == '\0') {
2173                         *currfound = currnode;
2174                         *foundtype = type;
2175                         return 1;
2176                 }
2177                 name = next;
2178         }
2179         return -1;
2180 }
2181
2182 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2183         struct ext2fs_node **foundnode, int expecttype)
2184 {
2185         int status;
2186         int foundtype = FILETYPE_DIRECTORY;
2187
2188         symlinknest = 0;
2189         if (!path)
2190                 return 0;
2191
2192         status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2193         if (status == 0)
2194                 return 0;
2195
2196         /* Check if the node that was found was of the expected type. */
2197         if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2198                 return 0;
2199         else if ((expecttype == FILETYPE_DIRECTORY)
2200                    && (foundtype != expecttype))
2201                 return 0;
2202
2203         return 1;
2204 }
2205
2206 int ext4fs_open(const char *filename, loff_t *len)
2207 {
2208         struct ext2fs_node *fdiro = NULL;
2209         int status;
2210
2211         if (ext4fs_root == NULL)
2212                 return -1;
2213
2214         ext4fs_file = NULL;
2215         status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2216                                   FILETYPE_REG);
2217         if (status == 0)
2218                 goto fail;
2219
2220         if (!fdiro->inode_read) {
2221                 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2222                                 &fdiro->inode);
2223                 if (status == 0)
2224                         goto fail;
2225         }
2226         *len = le32_to_cpu(fdiro->inode.size);
2227         ext4fs_file = fdiro;
2228
2229         return 0;
2230 fail:
2231         ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2232
2233         return -1;
2234 }
2235
2236 int ext4fs_mount(unsigned part_length)
2237 {
2238         struct ext2_data *data;
2239         int status;
2240         struct ext_filesystem *fs = get_fs();
2241         data = zalloc(SUPERBLOCK_SIZE);
2242         if (!data)
2243                 return 0;
2244
2245         /* Read the superblock. */
2246         status = ext4_read_superblock((char *)&data->sblock);
2247
2248         if (status == 0)
2249                 goto fail;
2250
2251         /* Make sure this is an ext2 filesystem. */
2252         if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2253                 goto fail;
2254
2255         /*
2256          * The 64bit feature was enabled when metadata_csum was enabled
2257          * and we do not support metadata_csum (and cannot reliably find
2258          * files when it is set.  Refuse to mount.
2259          */
2260         if (le32_to_cpu(data->sblock.feature_incompat) & EXT4_FEATURE_INCOMPAT_64BIT) {
2261                 printf("Unsupported feature found (64bit, possibly metadata_csum), not mounting\n");
2262                 goto fail;
2263         }
2264
2265         if (le32_to_cpu(data->sblock.revision_level) == 0)
2266                 fs->inodesz = 128;
2267         else
2268                 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2269
2270         debug("EXT2 rev %d, inode_size %d\n",
2271                le32_to_cpu(data->sblock.revision_level), fs->inodesz);
2272
2273         data->diropen.data = data;
2274         data->diropen.ino = 2;
2275         data->diropen.inode_read = 1;
2276         data->inode = &data->diropen.inode;
2277
2278         status = ext4fs_read_inode(data, 2, data->inode);
2279         if (status == 0)
2280                 goto fail;
2281
2282         ext4fs_root = data;
2283
2284         return 1;
2285 fail:
2286         printf("Failed to mount ext2 filesystem...\n");
2287         free(data);
2288         ext4fs_root = NULL;
2289
2290         return 0;
2291 }