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