fs/ext4/ext4_common.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2011 - 2012 Samsung Electronics
   4  * EXT4 filesystem implementation in Uboot by
   5  * Uma Shankar <uma.shankar@samsung.com>
   6  * Manjunatha C Achar <a.manjunatha@samsung.com>
   7  *
   8  * ext4ls and ext4load : Based on ext2 ls load support in Uboot.
   9  *
  10  * (C) Copyright 2004
  11  * esd gmbh <www.esd-electronics.com>
  12  * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
  13  *
  14  * based on code from grub2 fs/ext2.c and fs/fshelp.c by
  15  * GRUB  --  GRand Unified Bootloader
  16  * Copyright (C) 2003, 2004  Free Software Foundation, Inc.
  17  *
  18  * ext4write : Based on generic ext4 protocol.
  19  */
  20
  21 #include <common.h>
  22 #include <ext_common.h>
  23 #include <ext4fs.h>
  24 #include <malloc.h>
  25 #include <memalign.h>
  26 #include <stddef.h>
  27 #include <linux/stat.h>
  28 #include <linux/time.h>
  29 #include <asm/byteorder.h>
  30 #include "ext4_common.h"
  31
  32 struct ext2_data *ext4fs_root;
  33 struct ext2fs_node *ext4fs_file;
  34 __le32 *ext4fs_indir1_block;
  35 int ext4fs_indir1_size;
  36 int ext4fs_indir1_blkno = -1;
  37 __le32 *ext4fs_indir2_block;
  38 int ext4fs_indir2_size;
  39 int ext4fs_indir2_blkno = -1;
  40
  41 __le32 *ext4fs_indir3_block;
  42 int ext4fs_indir3_size;
  43 int ext4fs_indir3_blkno = -1;
  44 struct ext2_inode *g_parent_inode;
  45 static int symlinknest;
  46
  47 #if defined(CONFIG_EXT4_WRITE)
  48 struct ext2_block_group *ext4fs_get_group_descriptor
  49         (const struct ext_filesystem *fs, uint32_t bg_idx)
  50 {
  51         return (struct ext2_block_group *)(fs->gdtable + (bg_idx * fs->gdsize));
  52 }
  53
  54 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb)
  55 {
  56         sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1);
  57 }
  58
  59 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb)
  60 {
  61         uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
  62         free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
  63         free_blocks--;
  64
  65         sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
  66         sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
  67 }
  68
  69 static inline void ext4fs_bg_free_inodes_dec
  70         (struct ext2_block_group *bg, const struct ext_filesystem *fs)
  71 {
  72         uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
  73         if (fs->gdsize == 64)
  74                 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
  75         free_inodes--;
  76
  77         bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
  78         if (fs->gdsize == 64)
  79                 bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
  80 }
  81
  82 static inline void ext4fs_bg_free_blocks_dec
  83         (struct ext2_block_group *bg, const struct ext_filesystem *fs)
  84 {
  85         uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
  86         if (fs->gdsize == 64)
  87                 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
  88         free_blocks--;
  89
  90         bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
  91         if (fs->gdsize == 64)
  92                 bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
  93 }
  94
  95 static inline void ext4fs_bg_itable_unused_dec
  96         (struct ext2_block_group *bg, const struct ext_filesystem *fs)
  97 {
  98         uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused);
  99         if (fs->gdsize == 64)
 100                 free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16;
 101         free_inodes--;
 102
 103         bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff);
 104         if (fs->gdsize == 64)
 105                 bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16);
 106 }
 107
 108 uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb)
 109 {
 110         uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
 111         free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
 112         return free_blocks;
 113 }
 114
 115 void ext4fs_sb_set_free_blocks(struct ext2_sblock *sb, uint64_t free_blocks)
 116 {
 117         sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
 118         sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
 119 }
 120
 121 uint32_t ext4fs_bg_get_free_blocks(const struct ext2_block_group *bg,
 122                                    const struct ext_filesystem *fs)
 123 {
 124         uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
 125         if (fs->gdsize == 64)
 126                 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
 127         return free_blocks;
 128 }
 129
 130 static inline
 131 uint32_t ext4fs_bg_get_free_inodes(const struct ext2_block_group *bg,
 132                                    const struct ext_filesystem *fs)
 133 {
 134         uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
 135         if (fs->gdsize == 64)
 136                 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
 137         return free_inodes;
 138 }
 139
 140 static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group *bg)
 141 {
 142         return le16_to_cpu(bg->bg_flags);
 143 }
 144
 145 static inline void ext4fs_bg_set_flags(struct ext2_block_group *bg,
 146                                        uint16_t flags)
 147 {
 148         bg->bg_flags = cpu_to_le16(flags);
 149 }
 150
 151 /* Block number of the block bitmap */
 152 uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group *bg,
 153                                 const struct ext_filesystem *fs)
 154 {
 155         uint64_t block_nr = le32_to_cpu(bg->block_id);
 156         if (fs->gdsize == 64)
 157                 block_nr += (uint64_t)le32_to_cpu(bg->block_id_high) << 32;
 158         return block_nr;
 159 }
 160
 161 /* Block number of the inode bitmap */
 162 uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group *bg,
 163                                 const struct ext_filesystem *fs)
 164 {
 165         uint64_t block_nr = le32_to_cpu(bg->inode_id);
 166         if (fs->gdsize == 64)
 167                 block_nr += (uint64_t)le32_to_cpu(bg->inode_id_high) << 32;
 168         return block_nr;
 169 }
 170 #endif
 171
 172 /* Block number of the inode table */
 173 uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group *bg,
 174                                       const struct ext_filesystem *fs)
 175 {
 176         uint64_t block_nr = le32_to_cpu(bg->inode_table_id);
 177         if (fs->gdsize == 64)
 178                 block_nr +=
 179                         (uint64_t)le32_to_cpu(bg->inode_table_id_high) << 32;
 180         return block_nr;
 181 }
 182
 183 #if defined(CONFIG_EXT4_WRITE)
 184 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
 185 {
 186         uint32_t res = size / n;
 187         if (res * n != size)
 188                 res++;
 189
 190         return res;
 191 }
 192
 193 void put_ext4(uint64_t off, void *buf, uint32_t size)
 194 {
 195         uint64_t startblock;
 196         uint64_t remainder;
 197         unsigned char *temp_ptr = NULL;
 198         struct ext_filesystem *fs = get_fs();
 199         int log2blksz = fs->dev_desc->log2blksz;
 200         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
 201
 202         startblock = off >> log2blksz;
 203         startblock += part_offset;
 204         remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
 205
 206         if (fs->dev_desc == NULL)
 207                 return;
 208
 209         if ((startblock + (size >> log2blksz)) >
 210             (part_offset + fs->total_sect)) {
 211                 printf("part_offset is " LBAFU "\n", part_offset);
 212                 printf("total_sector is %llu\n", fs->total_sect);
 213                 printf("error: overflow occurs\n");
 214                 return;
 215         }
 216
 217         if (remainder) {
 218                 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
 219                 temp_ptr = sec_buf;
 220                 memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
 221                 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
 222         } else {
 223                 if (size >> log2blksz != 0) {
 224                         blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
 225                                    (unsigned long *)buf);
 226                 } else {
 227                         blk_dread(fs->dev_desc, startblock, 1, sec_buf);
 228                         temp_ptr = sec_buf;
 229                         memcpy(temp_ptr, buf, size);
 230                         blk_dwrite(fs->dev_desc, startblock, 1,
 231                                    (unsigned long *)sec_buf);
 232                 }
 233         }
 234 }
 235
 236 static int _get_new_inode_no(unsigned char *buffer)
 237 {
 238         struct ext_filesystem *fs = get_fs();
 239         unsigned char input;
 240         int operand, status;
 241         int count = 1;
 242         int j = 0;
 243
 244         /* get the blocksize of the filesystem */
 245         unsigned char *ptr = buffer;
 246         while (*ptr == 255) {
 247                 ptr++;
 248                 count += 8;
 249                 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group))
 250                         return -1;
 251         }
 252
 253         for (j = 0; j < fs->blksz; j++) {
 254                 input = *ptr;
 255                 int i = 0;
 256                 while (i <= 7) {
 257                         operand = 1 << i;
 258                         status = input & operand;
 259                         if (status) {
 260                                 i++;
 261                                 count++;
 262                         } else {
 263                                 *ptr |= operand;
 264                                 return count;
 265                         }
 266                 }
 267                 ptr = ptr + 1;
 268         }
 269
 270         return -1;
 271 }
 272
 273 static int _get_new_blk_no(unsigned char *buffer)
 274 {
 275         int operand;
 276         int count = 0;
 277         int i;
 278         unsigned char *ptr = buffer;
 279         struct ext_filesystem *fs = get_fs();
 280
 281         while (*ptr == 255) {
 282                 ptr++;
 283                 count += 8;
 284                 if (count == (fs->blksz * 8))
 285                         return -1;
 286         }
 287
 288         if (fs->blksz == 1024)
 289                 count += 1;
 290
 291         for (i = 0; i <= 7; i++) {
 292                 operand = 1 << i;
 293                 if (*ptr & operand) {
 294                         count++;
 295                 } else {
 296                         *ptr |= operand;
 297                         return count;
 298                 }
 299         }
 300
 301         return -1;
 302 }
 303
 304 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
 305 {
 306         int i, remainder, status;
 307         unsigned char *ptr = buffer;
 308         unsigned char operand;
 309         i = blockno / 8;
 310         remainder = blockno % 8;
 311         int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
 312
 313         i = i - (index * blocksize);
 314         if (blocksize != 1024) {
 315                 ptr = ptr + i;
 316                 operand = 1 << remainder;
 317                 status = *ptr & operand;
 318                 if (status)
 319                         return -1;
 320
 321                 *ptr = *ptr | operand;
 322                 return 0;
 323         } else {
 324                 if (remainder == 0) {
 325                         ptr = ptr + i - 1;
 326                         operand = (1 << 7);
 327                 } else {
 328                         ptr = ptr + i;
 329                         operand = (1 << (remainder - 1));
 330                 }
 331                 status = *ptr & operand;
 332                 if (status)
 333                         return -1;
 334
 335                 *ptr = *ptr | operand;
 336                 return 0;
 337         }
 338 }
 339
 340 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
 341 {
 342         int i, remainder, status;
 343         unsigned char *ptr = buffer;
 344         unsigned char operand;
 345         i = blockno / 8;
 346         remainder = blockno % 8;
 347         int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
 348
 349         i = i - (index * blocksize);
 350         if (blocksize != 1024) {
 351                 ptr = ptr + i;
 352                 operand = (1 << remainder);
 353                 status = *ptr & operand;
 354                 if (status)
 355                         *ptr = *ptr & ~(operand);
 356         } else {
 357                 if (remainder == 0) {
 358                         ptr = ptr + i - 1;
 359                         operand = (1 << 7);
 360                 } else {
 361                         ptr = ptr + i;
 362                         operand = (1 << (remainder - 1));
 363                 }
 364                 status = *ptr & operand;
 365                 if (status)
 366                         *ptr = *ptr & ~(operand);
 367         }
 368 }
 369
 370 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
 371 {
 372         int i, remainder, status;
 373         unsigned char *ptr = buffer;
 374         unsigned char operand;
 375
 376         inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
 377         i = inode_no / 8;
 378         remainder = inode_no % 8;
 379         if (remainder == 0) {
 380                 ptr = ptr + i - 1;
 381                 operand = (1 << 7);
 382         } else {
 383                 ptr = ptr + i;
 384                 operand = (1 << (remainder - 1));
 385         }
 386         status = *ptr & operand;
 387         if (status)
 388                 return -1;
 389
 390         *ptr = *ptr | operand;
 391
 392         return 0;
 393 }
 394
 395 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
 396 {
 397         int i, remainder, status;
 398         unsigned char *ptr = buffer;
 399         unsigned char operand;
 400
 401         inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
 402         i = inode_no / 8;
 403         remainder = inode_no % 8;
 404         if (remainder == 0) {
 405                 ptr = ptr + i - 1;
 406                 operand = (1 << 7);
 407         } else {
 408                 ptr = ptr + i;
 409                 operand = (1 << (remainder - 1));
 410         }
 411         status = *ptr & operand;
 412         if (status)
 413                 *ptr = *ptr & ~(operand);
 414 }
 415
 416 uint16_t ext4fs_checksum_update(uint32_t i)
 417 {
 418         struct ext2_block_group *desc;
 419         struct ext_filesystem *fs = get_fs();
 420         uint16_t crc = 0;
 421         __le32 le32_i = cpu_to_le32(i);
 422
 423         desc = ext4fs_get_group_descriptor(fs, i);
 424         if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
 425                 int offset = offsetof(struct ext2_block_group, bg_checksum);
 426
 427                 crc = ext2fs_crc16(~0, fs->sb->unique_id,
 428                                    sizeof(fs->sb->unique_id));
 429                 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i));
 430                 crc = ext2fs_crc16(crc, desc, offset);
 431                 offset += sizeof(desc->bg_checksum);    /* skip checksum */
 432                 assert(offset == sizeof(*desc));
 433                 if (offset < fs->gdsize) {
 434                         crc = ext2fs_crc16(crc, (__u8 *)desc + offset,
 435                                            fs->gdsize - offset);
 436                 }
 437         }
 438
 439         return crc;
 440 }
 441
 442 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
 443 {
 444         int dentry_length;
 445         int sizeof_void_space;
 446         int new_entry_byte_reqd;
 447         short padding_factor = 0;
 448
 449         if (dir->namelen % 4 != 0)
 450                 padding_factor = 4 - (dir->namelen % 4);
 451
 452         dentry_length = sizeof(struct ext2_dirent) +
 453                         dir->namelen + padding_factor;
 454         sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length;
 455         if (sizeof_void_space == 0)
 456                 return 0;
 457
 458         padding_factor = 0;
 459         if (strlen(filename) % 4 != 0)
 460                 padding_factor = 4 - (strlen(filename) % 4);
 461
 462         new_entry_byte_reqd = strlen(filename) +
 463             sizeof(struct ext2_dirent) + padding_factor;
 464         if (sizeof_void_space >= new_entry_byte_reqd) {
 465                 dir->direntlen = cpu_to_le16(dentry_length);
 466                 return sizeof_void_space;
 467         }
 468
 469         return 0;
 470 }
 471
 472 int ext4fs_update_parent_dentry(char *filename, int file_type)
 473 {
 474         unsigned int *zero_buffer = NULL;
 475         char *root_first_block_buffer = NULL;
 476         int blk_idx;
 477         long int first_block_no_of_root = 0;
 478         int totalbytes = 0;
 479         unsigned int new_entry_byte_reqd;
 480         int sizeof_void_space = 0;
 481         int templength = 0;
 482         int inodeno = -1;
 483         int status;
 484         struct ext_filesystem *fs = get_fs();
 485         /* directory entry */
 486         struct ext2_dirent *dir;
 487         char *temp_dir = NULL;
 488         uint32_t new_blk_no;
 489         uint32_t new_size;
 490         uint32_t new_blockcnt;
 491         uint32_t directory_blocks;
 492
 493         zero_buffer = zalloc(fs->blksz);
 494         if (!zero_buffer) {
 495                 printf("No Memory\n");
 496                 return -1;
 497         }
 498         root_first_block_buffer = zalloc(fs->blksz);
 499         if (!root_first_block_buffer) {
 500                 free(zero_buffer);
 501                 printf("No Memory\n");
 502                 return -1;
 503         }
 504         new_entry_byte_reqd = ROUND(strlen(filename) +
 505                                     sizeof(struct ext2_dirent), 4);
 506 restart:
 507         directory_blocks = le32_to_cpu(g_parent_inode->size) >>
 508                 LOG2_BLOCK_SIZE(ext4fs_root);
 509         blk_idx = directory_blocks - 1;
 510
 511 restart_read:
 512         /* read the block no allocated to a file */
 513         first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx);
 514         if (first_block_no_of_root <= 0)
 515                 goto fail;
 516
 517         status = ext4fs_devread((lbaint_t)first_block_no_of_root
 518                                 * fs->sect_perblk,
 519                                 0, fs->blksz, root_first_block_buffer);
 520         if (status == 0)
 521                 goto fail;
 522
 523         if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
 524                 goto fail;
 525         dir = (struct ext2_dirent *)root_first_block_buffer;
 526         totalbytes = 0;
 527
 528         while (le16_to_cpu(dir->direntlen) > 0) {
 529                 unsigned short used_len = ROUND(dir->namelen +
 530                     sizeof(struct ext2_dirent), 4);
 531
 532                 /* last entry of block */
 533                 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) {
 534
 535                         /* check if new entry fits */
 536                         if ((used_len + new_entry_byte_reqd) <=
 537                             le16_to_cpu(dir->direntlen)) {
 538                                 dir->direntlen = cpu_to_le16(used_len);
 539                                 break;
 540                         } else {
 541                                 if (blk_idx > 0) {
 542                                         printf("Block full, trying previous\n");
 543                                         blk_idx--;
 544                                         goto restart_read;
 545                                 }
 546                                 printf("All blocks full: Allocate new\n");
 547
 548                                 if (le32_to_cpu(g_parent_inode->flags) &
 549                                                 EXT4_EXTENTS_FL) {
 550                                         printf("Directory uses extents\n");
 551                                         goto fail;
 552                                 }
 553                                 if (directory_blocks >= INDIRECT_BLOCKS) {
 554                                         printf("Directory exceeds limit\n");
 555                                         goto fail;
 556                                 }
 557                                 new_blk_no = ext4fs_get_new_blk_no();
 558                                 if (new_blk_no == -1) {
 559                                         printf("no block left to assign\n");
 560                                         goto fail;
 561                                 }
 562                                 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz);
 563                                 g_parent_inode->b.blocks.
 564                                         dir_blocks[directory_blocks] =
 565                                         cpu_to_le32(new_blk_no);
 566
 567                                 new_size = le32_to_cpu(g_parent_inode->size);
 568                                 new_size += fs->blksz;
 569                                 g_parent_inode->size = cpu_to_le32(new_size);
 570
 571                                 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt);
 572                                 new_blockcnt += fs->sect_perblk;
 573                                 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt);
 574
 575                                 if (ext4fs_put_metadata
 576                                     (root_first_block_buffer,
 577                                      first_block_no_of_root))
 578                                         goto fail;
 579                                 goto restart;
 580                         }
 581                 }
 582
 583                 templength = le16_to_cpu(dir->direntlen);
 584                 totalbytes = totalbytes + templength;
 585                 sizeof_void_space = check_void_in_dentry(dir, filename);
 586                 if (sizeof_void_space)
 587                         break;
 588
 589                 dir = (struct ext2_dirent *)((char *)dir + templength);
 590         }
 591
 592         /* make a pointer ready for creating next directory entry */
 593         templength = le16_to_cpu(dir->direntlen);
 594         totalbytes = totalbytes + templength;
 595         dir = (struct ext2_dirent *)((char *)dir + templength);
 596
 597         /* get the next available inode number */
 598         inodeno = ext4fs_get_new_inode_no();
 599         if (inodeno == -1) {
 600                 printf("no inode left to assign\n");
 601                 goto fail;
 602         }
 603         dir->inode = cpu_to_le32(inodeno);
 604         if (sizeof_void_space)
 605                 dir->direntlen = cpu_to_le16(sizeof_void_space);
 606         else
 607                 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes);
 608
 609         dir->namelen = strlen(filename);
 610         dir->filetype = FILETYPE_REG;   /* regular file */
 611         temp_dir = (char *)dir;
 612         temp_dir = temp_dir + sizeof(struct ext2_dirent);
 613         memcpy(temp_dir, filename, strlen(filename));
 614
 615         /* update or write  the 1st block of root inode */
 616         if (ext4fs_put_metadata(root_first_block_buffer,
 617                                 first_block_no_of_root))
 618                 goto fail;
 619
 620 fail:
 621         free(zero_buffer);
 622         free(root_first_block_buffer);
 623
 624         return inodeno;
 625 }
 626
 627 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
 628 {
 629         int status;
 630         int inodeno = 0;
 631         int offset;
 632         int blk_idx;
 633         long int blknr;
 634         char *block_buffer = NULL;
 635         struct ext2_dirent *dir = NULL;
 636         struct ext_filesystem *fs = get_fs();
 637         uint32_t directory_blocks;
 638         char *direntname;
 639
 640         directory_blocks = le32_to_cpu(parent_inode->size) >>
 641                 LOG2_BLOCK_SIZE(ext4fs_root);
 642
 643         block_buffer = zalloc(fs->blksz);
 644         if (!block_buffer)
 645                 goto fail;
 646
 647         /* get the block no allocated to a file */
 648         for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
 649                 blknr = read_allocated_block(parent_inode, blk_idx);
 650                 if (blknr <= 0)
 651                         goto fail;
 652
 653                 /* read the directory block */
 654                 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
 655                                         0, fs->blksz, (char *)block_buffer);
 656                 if (status == 0)
 657                         goto fail;
 658
 659                 offset = 0;
 660                 do {
 661                         if (offset & 3) {
 662                                 printf("Badly aligned ext2_dirent\n");
 663                                 break;
 664                         }
 665
 666                         dir = (struct ext2_dirent *)(block_buffer + offset);
 667                         direntname = (char*)(dir) + sizeof(struct ext2_dirent);
 668
 669                         int direntlen = le16_to_cpu(dir->direntlen);
 670                         if (direntlen < sizeof(struct ext2_dirent))
 671                                 break;
 672
 673                         if (dir->inode && (strlen(dirname) == dir->namelen) &&
 674                             (strncmp(dirname, direntname, dir->namelen) == 0)) {
 675                                 inodeno = le32_to_cpu(dir->inode);
 676                                 break;
 677                         }
 678
 679                         offset += direntlen;
 680
 681                 } while (offset < fs->blksz);
 682
 683                 if (inodeno > 0) {
 684                         free(block_buffer);
 685                         return inodeno;
 686                 }
 687         }
 688
 689 fail:
 690         free(block_buffer);
 691
 692         return -1;
 693 }
 694
 695 static int find_dir_depth(char *dirname)
 696 {
 697         char *token = strtok(dirname, "/");
 698         int count = 0;
 699         while (token != NULL) {
 700                 token = strtok(NULL, "/");
 701                 count++;
 702         }
 703         return count + 1 + 1;
 704         /*
 705          * for example  for string /home/temp
 706          * depth=home(1)+temp(1)+1 extra for NULL;
 707          * so count is 4;
 708          */
 709 }
 710
 711 static int parse_path(char **arr, char *dirname)
 712 {
 713         char *token = strtok(dirname, "/");
 714         int i = 0;
 715
 716         /* add root */
 717         arr[i] = zalloc(strlen("/") + 1);
 718         if (!arr[i])
 719                 return -ENOMEM;
 720         memcpy(arr[i++], "/", strlen("/"));
 721
 722         /* add each path entry after root */
 723         while (token != NULL) {
 724                 arr[i] = zalloc(strlen(token) + 1);
 725                 if (!arr[i])
 726                         return -ENOMEM;
 727                 memcpy(arr[i++], token, strlen(token));
 728                 token = strtok(NULL, "/");
 729         }
 730         arr[i] = NULL;
 731
 732         return 0;
 733 }
 734
 735 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
 736 {
 737         if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
 738                 return -1;
 739
 740         return 0;
 741 }
 742
 743 /*
 744  * Function: ext4fs_get_parent_inode_num
 745  * Return Value: inode Number of the parent directory of  file/Directory to be
 746  * created
 747  * dirname : Input parmater, input path name of the file/directory to be created
 748  * dname : Output parameter, to be filled with the name of the directory
 749  * extracted from dirname
 750  */
 751 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
 752 {
 753         int i;
 754         int depth = 0;
 755         int matched_inode_no;
 756         int result_inode_no = -1;
 757         char **ptr = NULL;
 758         char *depth_dirname = NULL;
 759         char *parse_dirname = NULL;
 760         struct ext2_inode *parent_inode = NULL;
 761         struct ext2_inode *first_inode = NULL;
 762         struct ext2_inode temp_inode;
 763
 764         if (*dirname != '/') {
 765                 printf("Please supply Absolute path\n");
 766                 return -1;
 767         }
 768
 769         /* TODO: input validation make equivalent to linux */
 770         depth_dirname = zalloc(strlen(dirname) + 1);
 771         if (!depth_dirname)
 772                 return -ENOMEM;
 773
 774         memcpy(depth_dirname, dirname, strlen(dirname));
 775         depth = find_dir_depth(depth_dirname);
 776         parse_dirname = zalloc(strlen(dirname) + 1);
 777         if (!parse_dirname)
 778                 goto fail;
 779         memcpy(parse_dirname, dirname, strlen(dirname));
 780
 781         /* allocate memory for each directory level */
 782         ptr = zalloc((depth) * sizeof(char *));
 783         if (!ptr)
 784                 goto fail;
 785         if (parse_path(ptr, parse_dirname))
 786                 goto fail;
 787         parent_inode = zalloc(sizeof(struct ext2_inode));
 788         if (!parent_inode)
 789                 goto fail;
 790         first_inode = zalloc(sizeof(struct ext2_inode));
 791         if (!first_inode)
 792                 goto fail;
 793         memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
 794         memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
 795         if (flags & F_FILE)
 796                 result_inode_no = EXT2_ROOT_INO;
 797         for (i = 1; i < depth; i++) {
 798                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 799                 if (matched_inode_no == -1) {
 800                         if (ptr[i + 1] == NULL && i == 1) {
 801                                 result_inode_no = EXT2_ROOT_INO;
 802                                 goto end;
 803                         } else {
 804                                 if (ptr[i + 1] == NULL)
 805                                         break;
 806                                 printf("Invalid path\n");
 807                                 result_inode_no = -1;
 808                                 goto fail;
 809                         }
 810                 } else {
 811                         if (ptr[i + 1] != NULL) {
 812                                 memset(parent_inode, '\0',
 813                                        sizeof(struct ext2_inode));
 814                                 if (ext4fs_iget(matched_inode_no,
 815                                                 parent_inode)) {
 816                                         result_inode_no = -1;
 817                                         goto fail;
 818                                 }
 819                                 result_inode_no = matched_inode_no;
 820                         } else {
 821                                 break;
 822                         }
 823                 }
 824         }
 825
 826 end:
 827         if (i == 1)
 828                 matched_inode_no = search_dir(first_inode, ptr[i]);
 829         else
 830                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 831
 832         if (matched_inode_no != -1) {
 833                 ext4fs_iget(matched_inode_no, &temp_inode);
 834                 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) {
 835                         printf("It is a Directory\n");
 836                         result_inode_no = -1;
 837                         goto fail;
 838                 }
 839         }
 840
 841         if (strlen(ptr[i]) > 256) {
 842                 result_inode_no = -1;
 843                 goto fail;
 844         }
 845         memcpy(dname, ptr[i], strlen(ptr[i]));
 846
 847 fail:
 848         free(depth_dirname);
 849         free(parse_dirname);
 850         for (i = 0; i < depth; i++) {
 851                 if (!ptr[i])
 852                         break;
 853                 free(ptr[i]);
 854         }
 855         free(ptr);
 856         free(parent_inode);
 857         free(first_inode);
 858
 859         return result_inode_no;
 860 }
 861
 862 static int unlink_filename(char *filename, unsigned int blknr)
 863 {
 864         int status;
 865         int inodeno = 0;
 866         int offset;
 867         char *block_buffer = NULL;
 868         struct ext2_dirent *dir = NULL;
 869         struct ext2_dirent *previous_dir;
 870         struct ext_filesystem *fs = get_fs();
 871         int ret = -1;
 872         char *direntname;
 873
 874         block_buffer = zalloc(fs->blksz);
 875         if (!block_buffer)
 876                 return -ENOMEM;
 877
 878         /* read the directory block */
 879         status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
 880                                 fs->blksz, block_buffer);
 881         if (status == 0)
 882                 goto fail;
 883
 884         offset = 0;
 885         do {
 886                 if (offset & 3) {
 887                         printf("Badly aligned ext2_dirent\n");
 888                         break;
 889                 }
 890
 891                 previous_dir = dir;
 892                 dir = (struct ext2_dirent *)(block_buffer + offset);
 893                 direntname = (char *)(dir) + sizeof(struct ext2_dirent);
 894
 895                 int direntlen = le16_to_cpu(dir->direntlen);
 896                 if (direntlen < sizeof(struct ext2_dirent))
 897                         break;
 898
 899                 if (dir->inode && (strlen(filename) == dir->namelen) &&
 900                     (strncmp(direntname, filename, dir->namelen) == 0)) {
 901                         inodeno = le32_to_cpu(dir->inode);
 902                         break;
 903                 }
 904
 905                 offset += direntlen;
 906
 907         } while (offset < fs->blksz);
 908
 909         if (inodeno > 0) {
 910                 printf("file found, deleting\n");
 911                 if (ext4fs_log_journal(block_buffer, blknr))
 912                         goto fail;
 913
 914                 if (previous_dir) {
 915                         /* merge dir entry with predecessor */
 916                         uint16_t new_len;
 917                         new_len = le16_to_cpu(previous_dir->direntlen);
 918                         new_len += le16_to_cpu(dir->direntlen);
 919                         previous_dir->direntlen = cpu_to_le16(new_len);
 920                 } else {
 921                         /* invalidate dir entry */
 922                         dir->inode = 0;
 923                 }
 924                 if (ext4fs_put_metadata(block_buffer, blknr))
 925                         goto fail;
 926                 ret = inodeno;
 927         }
 928 fail:
 929         free(block_buffer);
 930
 931         return ret;
 932 }
 933
 934 int ext4fs_filename_unlink(char *filename)
 935 {
 936         int blk_idx;
 937         long int blknr = -1;
 938         int inodeno = -1;
 939         uint32_t directory_blocks;
 940
 941         directory_blocks = le32_to_cpu(g_parent_inode->size) >>
 942                 LOG2_BLOCK_SIZE(ext4fs_root);
 943
 944         /* read the block no allocated to a file */
 945         for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
 946                 blknr = read_allocated_block(g_parent_inode, blk_idx);
 947                 if (blknr <= 0)
 948                         break;
 949                 inodeno = unlink_filename(filename, blknr);
 950                 if (inodeno != -1)
 951                         return inodeno;
 952         }
 953
 954         return -1;
 955 }
 956
 957 uint32_t ext4fs_get_new_blk_no(void)
 958 {
 959         short i;
 960         short status;
 961         int remainder;
 962         unsigned int bg_idx;
 963         static int prev_bg_bitmap_index = -1;
 964         unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 965         struct ext_filesystem *fs = get_fs();
 966         char *journal_buffer = zalloc(fs->blksz);
 967         char *zero_buffer = zalloc(fs->blksz);
 968         if (!journal_buffer || !zero_buffer)
 969                 goto fail;
 970
 971         if (fs->first_pass_bbmap == 0) {
 972                 for (i = 0; i < fs->no_blkgrp; i++) {
 973                         struct ext2_block_group *bgd = NULL;
 974                         bgd = ext4fs_get_group_descriptor(fs, i);
 975                         if (ext4fs_bg_get_free_blocks(bgd, fs)) {
 976                                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
 977                                 uint64_t b_bitmap_blk =
 978                                         ext4fs_bg_get_block_id(bgd, fs);
 979                                 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
 980                                         memcpy(fs->blk_bmaps[i], zero_buffer,
 981                                                fs->blksz);
 982                                         put_ext4(b_bitmap_blk * fs->blksz,
 983                                                  fs->blk_bmaps[i], fs->blksz);
 984                                         bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
 985                                         ext4fs_bg_set_flags(bgd, bg_flags);
 986                                 }
 987                                 fs->curr_blkno =
 988                                     _get_new_blk_no(fs->blk_bmaps[i]);
 989                                 if (fs->curr_blkno == -1)
 990                                         /* block bitmap is completely filled */
 991                                         continue;
 992                                 fs->curr_blkno = fs->curr_blkno +
 993                                                 (i * fs->blksz * 8);
 994                                 fs->first_pass_bbmap++;
 995                                 ext4fs_bg_free_blocks_dec(bgd, fs);
 996                                 ext4fs_sb_free_blocks_dec(fs->sb);
 997                                 status = ext4fs_devread(b_bitmap_blk *
 998                                                         fs->sect_perblk,
 999                                                         0, fs->blksz,
1000                                                         journal_buffer);
1001                                 if (status == 0)
1002                                         goto fail;
1003                                 if (ext4fs_log_journal(journal_buffer,
1004                                                        b_bitmap_blk))
1005                                         goto fail;
1006                                 goto success;
1007                         } else {
1008                                 debug("no space left on block group %d\n", i);
1009                         }
1010                 }
1011
1012                 goto fail;
1013         } else {
1014                 fs->curr_blkno++;
1015 restart:
1016                 /* get the blockbitmap index respective to blockno */
1017                 bg_idx = fs->curr_blkno / blk_per_grp;
1018                 if (fs->blksz == 1024) {
1019                         remainder = fs->curr_blkno % blk_per_grp;
1020                         if (!remainder)
1021                                 bg_idx--;
1022                 }
1023
1024                 /*
1025                  * To skip completely filled block group bitmaps
1026                  * Optimize the block allocation
1027                  */
1028                 if (bg_idx >= fs->no_blkgrp)
1029                         goto fail;
1030
1031                 struct ext2_block_group *bgd = NULL;
1032                 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
1033                 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) {
1034                         debug("block group %u is full. Skipping\n", bg_idx);
1035                         fs->curr_blkno = (bg_idx + 1) * blk_per_grp;
1036                         if (fs->blksz == 1024)
1037                                 fs->curr_blkno += 1;
1038                         goto restart;
1039                 }
1040
1041                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1042                 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
1043                 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
1044                         memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
1045                         put_ext4(b_bitmap_blk * fs->blksz,
1046                                  zero_buffer, fs->blksz);
1047                         bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
1048                         ext4fs_bg_set_flags(bgd, bg_flags);
1049                 }
1050
1051                 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
1052                                    bg_idx) != 0) {
1053                         debug("going for restart for the block no %ld %u\n",
1054                               fs->curr_blkno, bg_idx);
1055                         fs->curr_blkno++;
1056                         goto restart;
1057                 }
1058
1059                 /* journal backup */
1060                 if (prev_bg_bitmap_index != bg_idx) {
1061                         status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
1062                                                 0, fs->blksz, journal_buffer);
1063                         if (status == 0)
1064                                 goto fail;
1065                         if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
1066                                 goto fail;
1067
1068                         prev_bg_bitmap_index = bg_idx;
1069                 }
1070                 ext4fs_bg_free_blocks_dec(bgd, fs);
1071                 ext4fs_sb_free_blocks_dec(fs->sb);
1072                 goto success;
1073         }
1074 success:
1075         free(journal_buffer);
1076         free(zero_buffer);
1077
1078         return fs->curr_blkno;
1079 fail:
1080         free(journal_buffer);
1081         free(zero_buffer);
1082
1083         return -1;
1084 }
1085
1086 int ext4fs_get_new_inode_no(void)
1087 {
1088         short i;
1089         short status;
1090         unsigned int ibmap_idx;
1091         static int prev_inode_bitmap_index = -1;
1092         unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
1093         struct ext_filesystem *fs = get_fs();
1094         char *journal_buffer = zalloc(fs->blksz);
1095         char *zero_buffer = zalloc(fs->blksz);
1096         if (!journal_buffer || !zero_buffer)
1097                 goto fail;
1098         int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) &
1099                 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0;
1100
1101         if (fs->first_pass_ibmap == 0) {
1102                 for (i = 0; i < fs->no_blkgrp; i++) {
1103                         uint32_t free_inodes;
1104                         struct ext2_block_group *bgd = NULL;
1105                         bgd = ext4fs_get_group_descriptor(fs, i);
1106                         free_inodes = ext4fs_bg_get_free_inodes(bgd, fs);
1107                         if (free_inodes) {
1108                                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1109                                 uint64_t i_bitmap_blk =
1110                                         ext4fs_bg_get_inode_id(bgd, fs);
1111                                 if (has_gdt_chksum)
1112                                         bgd->bg_itable_unused = free_inodes;
1113                                 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1114                                         put_ext4(i_bitmap_blk * fs->blksz,
1115                                                  zero_buffer, fs->blksz);
1116                                         bg_flags &= ~EXT4_BG_INODE_UNINIT;
1117                                         ext4fs_bg_set_flags(bgd, bg_flags);
1118                                         memcpy(fs->inode_bmaps[i],
1119                                                zero_buffer, fs->blksz);
1120                                 }
1121                                 fs->curr_inode_no =
1122                                     _get_new_inode_no(fs->inode_bmaps[i]);
1123                                 if (fs->curr_inode_no == -1)
1124                                         /* inode bitmap is completely filled */
1125                                         continue;
1126                                 fs->curr_inode_no = fs->curr_inode_no +
1127                                                         (i * inodes_per_grp);
1128                                 fs->first_pass_ibmap++;
1129                                 ext4fs_bg_free_inodes_dec(bgd, fs);
1130                                 if (has_gdt_chksum)
1131                                         ext4fs_bg_itable_unused_dec(bgd, fs);
1132                                 ext4fs_sb_free_inodes_dec(fs->sb);
1133                                 status = ext4fs_devread(i_bitmap_blk *
1134                                                         fs->sect_perblk,
1135                                                         0, fs->blksz,
1136                                                         journal_buffer);
1137                                 if (status == 0)
1138                                         goto fail;
1139                                 if (ext4fs_log_journal(journal_buffer,
1140                                                        i_bitmap_blk))
1141                                         goto fail;
1142                                 goto success;
1143                         } else
1144                                 debug("no inode left on block group %d\n", i);
1145                 }
1146                 goto fail;
1147         } else {
1148 restart:
1149                 fs->curr_inode_no++;
1150                 /* get the blockbitmap index respective to blockno */
1151                 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1152                 struct ext2_block_group *bgd =
1153                         ext4fs_get_group_descriptor(fs, ibmap_idx);
1154                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1155                 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
1156
1157                 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1158                         put_ext4(i_bitmap_blk * fs->blksz,
1159                                  zero_buffer, fs->blksz);
1160                         bg_flags &= ~EXT4_BG_INODE_UNINIT;
1161                         ext4fs_bg_set_flags(bgd, bg_flags);
1162                         memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1163                                 fs->blksz);
1164                 }
1165
1166                 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1167                                           fs->inode_bmaps[ibmap_idx],
1168                                           ibmap_idx) != 0) {
1169                         debug("going for restart for the block no %d %u\n",
1170                               fs->curr_inode_no, ibmap_idx);
1171                         goto restart;
1172                 }
1173
1174                 /* journal backup */
1175                 if (prev_inode_bitmap_index != ibmap_idx) {
1176                         status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk,
1177                                                 0, fs->blksz, journal_buffer);
1178                         if (status == 0)
1179                                 goto fail;
1180                         if (ext4fs_log_journal(journal_buffer,
1181                                                 le32_to_cpu(bgd->inode_id)))
1182                                 goto fail;
1183                         prev_inode_bitmap_index = ibmap_idx;
1184                 }
1185                 ext4fs_bg_free_inodes_dec(bgd, fs);
1186                 if (has_gdt_chksum)
1187                         bgd->bg_itable_unused = bgd->free_inodes;
1188                 ext4fs_sb_free_inodes_dec(fs->sb);
1189                 goto success;
1190         }
1191
1192 success:
1193         free(journal_buffer);
1194         free(zero_buffer);
1195
1196         return fs->curr_inode_no;
1197 fail:
1198         free(journal_buffer);
1199         free(zero_buffer);
1200
1201         return -1;
1202
1203 }
1204
1205
1206 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1207                                         unsigned int *total_remaining_blocks,
1208                                         unsigned int *no_blks_reqd)
1209 {
1210         short i;
1211         short status;
1212         long int actual_block_no;
1213         long int si_blockno;
1214         /* si :single indirect */
1215         __le32 *si_buffer = NULL;
1216         __le32 *si_start_addr = NULL;
1217         struct ext_filesystem *fs = get_fs();
1218
1219         if (*total_remaining_blocks != 0) {
1220                 si_buffer = zalloc(fs->blksz);
1221                 if (!si_buffer) {
1222                         printf("No Memory\n");
1223                         return;
1224                 }
1225                 si_start_addr = si_buffer;
1226                 si_blockno = ext4fs_get_new_blk_no();
1227                 if (si_blockno == -1) {
1228                         printf("no block left to assign\n");
1229                         goto fail;
1230                 }
1231                 (*no_blks_reqd)++;
1232                 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1233
1234                 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1235                                         0, fs->blksz, (char *)si_buffer);
1236                 memset(si_buffer, '\0', fs->blksz);
1237                 if (status == 0)
1238                         goto fail;
1239
1240                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1241                         actual_block_no = ext4fs_get_new_blk_no();
1242                         if (actual_block_no == -1) {
1243                                 printf("no block left to assign\n");
1244                                 goto fail;
1245                         }
1246                         *si_buffer = cpu_to_le32(actual_block_no);
1247                         debug("SIAB %u: %u\n", *si_buffer,
1248                                 *total_remaining_blocks);
1249
1250                         si_buffer++;
1251                         (*total_remaining_blocks)--;
1252                         if (*total_remaining_blocks == 0)
1253                                 break;
1254                 }
1255
1256                 /* write the block to disk */
1257                 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1258                          si_start_addr, fs->blksz);
1259                 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1260         }
1261 fail:
1262         free(si_start_addr);
1263 }
1264
1265 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1266                                         unsigned int *total_remaining_blocks,
1267                                         unsigned int *no_blks_reqd)
1268 {
1269         short i;
1270         short j;
1271         short status;
1272         long int actual_block_no;
1273         /* di:double indirect */
1274         long int di_blockno_parent;
1275         long int di_blockno_child;
1276         __le32 *di_parent_buffer = NULL;
1277         __le32 *di_child_buff = NULL;
1278         __le32 *di_block_start_addr = NULL;
1279         __le32 *di_child_buff_start = NULL;
1280         struct ext_filesystem *fs = get_fs();
1281
1282         if (*total_remaining_blocks != 0) {
1283                 /* double indirect parent block connecting to inode */
1284                 di_blockno_parent = ext4fs_get_new_blk_no();
1285                 if (di_blockno_parent == -1) {
1286                         printf("no block left to assign\n");
1287                         goto fail;
1288                 }
1289                 di_parent_buffer = zalloc(fs->blksz);
1290                 if (!di_parent_buffer)
1291                         goto fail;
1292
1293                 di_block_start_addr = di_parent_buffer;
1294                 (*no_blks_reqd)++;
1295                 debug("DIPB %ld: %u\n", di_blockno_parent,
1296                       *total_remaining_blocks);
1297
1298                 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1299                                         fs->sect_perblk, 0,
1300                                         fs->blksz, (char *)di_parent_buffer);
1301
1302                 if (!status) {
1303                         printf("%s: Device read error!\n", __func__);
1304                         goto fail;
1305                 }
1306                 memset(di_parent_buffer, '\0', fs->blksz);
1307
1308                 /*
1309                  * start:for each double indirect parent
1310                  * block create one more block
1311                  */
1312                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1313                         di_blockno_child = ext4fs_get_new_blk_no();
1314                         if (di_blockno_child == -1) {
1315                                 printf("no block left to assign\n");
1316                                 goto fail;
1317                         }
1318                         di_child_buff = zalloc(fs->blksz);
1319                         if (!di_child_buff)
1320                                 goto fail;
1321
1322                         di_child_buff_start = di_child_buff;
1323                         *di_parent_buffer = cpu_to_le32(di_blockno_child);
1324                         di_parent_buffer++;
1325                         (*no_blks_reqd)++;
1326                         debug("DICB %ld: %u\n", di_blockno_child,
1327                               *total_remaining_blocks);
1328
1329                         status = ext4fs_devread((lbaint_t)di_blockno_child *
1330                                                 fs->sect_perblk, 0,
1331                                                 fs->blksz,
1332                                                 (char *)di_child_buff);
1333
1334                         if (!status) {
1335                                 printf("%s: Device read error!\n", __func__);
1336                                 goto fail;
1337                         }
1338                         memset(di_child_buff, '\0', fs->blksz);
1339                         /* filling of actual datablocks for each child */
1340                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1341                                 actual_block_no = ext4fs_get_new_blk_no();
1342                                 if (actual_block_no == -1) {
1343                                         printf("no block left to assign\n");
1344                                         goto fail;
1345                                 }
1346                                 *di_child_buff = cpu_to_le32(actual_block_no);
1347                                 debug("DIAB %ld: %u\n", actual_block_no,
1348                                       *total_remaining_blocks);
1349
1350                                 di_child_buff++;
1351                                 (*total_remaining_blocks)--;
1352                                 if (*total_remaining_blocks == 0)
1353                                         break;
1354                         }
1355                         /* write the block  table */
1356                         put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1357                                  di_child_buff_start, fs->blksz);
1358                         free(di_child_buff_start);
1359                         di_child_buff_start = NULL;
1360
1361                         if (*total_remaining_blocks == 0)
1362                                 break;
1363                 }
1364                 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1365                          di_block_start_addr, fs->blksz);
1366                 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1367         }
1368 fail:
1369         free(di_block_start_addr);
1370 }
1371
1372 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1373                                         unsigned int *total_remaining_blocks,
1374                                         unsigned int *no_blks_reqd)
1375 {
1376         short i;
1377         short j;
1378         short k;
1379         long int actual_block_no;
1380         /* ti: Triple Indirect */
1381         long int ti_gp_blockno;
1382         long int ti_parent_blockno;
1383         long int ti_child_blockno;
1384         __le32 *ti_gp_buff = NULL;
1385         __le32 *ti_parent_buff = NULL;
1386         __le32 *ti_child_buff = NULL;
1387         __le32 *ti_gp_buff_start_addr = NULL;
1388         __le32 *ti_pbuff_start_addr = NULL;
1389         __le32 *ti_cbuff_start_addr = NULL;
1390         struct ext_filesystem *fs = get_fs();
1391         if (*total_remaining_blocks != 0) {
1392                 /* triple indirect grand parent block connecting to inode */
1393                 ti_gp_blockno = ext4fs_get_new_blk_no();
1394                 if (ti_gp_blockno == -1) {
1395                         printf("no block left to assign\n");
1396                         return;
1397                 }
1398                 ti_gp_buff = zalloc(fs->blksz);
1399                 if (!ti_gp_buff)
1400                         return;
1401
1402                 ti_gp_buff_start_addr = ti_gp_buff;
1403                 (*no_blks_reqd)++;
1404                 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1405                       *total_remaining_blocks);
1406
1407                 /* for each 4 byte grand parent entry create one more block */
1408                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1409                         ti_parent_blockno = ext4fs_get_new_blk_no();
1410                         if (ti_parent_blockno == -1) {
1411                                 printf("no block left to assign\n");
1412                                 goto fail;
1413                         }
1414                         ti_parent_buff = zalloc(fs->blksz);
1415                         if (!ti_parent_buff)
1416                                 goto fail;
1417
1418                         ti_pbuff_start_addr = ti_parent_buff;
1419                         *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1420                         ti_gp_buff++;
1421                         (*no_blks_reqd)++;
1422                         debug("TIPB %ld: %u\n", ti_parent_blockno,
1423                               *total_remaining_blocks);
1424
1425                         /* for each 4 byte entry parent create one more block */
1426                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1427                                 ti_child_blockno = ext4fs_get_new_blk_no();
1428                                 if (ti_child_blockno == -1) {
1429                                         printf("no block left assign\n");
1430                                         goto fail1;
1431                                 }
1432                                 ti_child_buff = zalloc(fs->blksz);
1433                                 if (!ti_child_buff)
1434                                         goto fail1;
1435
1436                                 ti_cbuff_start_addr = ti_child_buff;
1437                                 *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1438                                 ti_parent_buff++;
1439                                 (*no_blks_reqd)++;
1440                                 debug("TICB %ld: %u\n", ti_parent_blockno,
1441                                       *total_remaining_blocks);
1442
1443                                 /* fill actual datablocks for each child */
1444                                 for (k = 0; k < (fs->blksz / sizeof(int));
1445                                         k++) {
1446                                         actual_block_no =
1447                                             ext4fs_get_new_blk_no();
1448                                         if (actual_block_no == -1) {
1449                                                 printf("no block left\n");
1450                                                 free(ti_cbuff_start_addr);
1451                                                 goto fail1;
1452                                         }
1453                                         *ti_child_buff = cpu_to_le32(actual_block_no);
1454                                         debug("TIAB %ld: %u\n", actual_block_no,
1455                                               *total_remaining_blocks);
1456
1457                                         ti_child_buff++;
1458                                         (*total_remaining_blocks)--;
1459                                         if (*total_remaining_blocks == 0)
1460                                                 break;
1461                                 }
1462                                 /* write the child block */
1463                                 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1464                                                       (uint64_t)fs->blksz)),
1465                                          ti_cbuff_start_addr, fs->blksz);
1466                                 free(ti_cbuff_start_addr);
1467
1468                                 if (*total_remaining_blocks == 0)
1469                                         break;
1470                         }
1471                         /* write the parent block */
1472                         put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1473                                  ti_pbuff_start_addr, fs->blksz);
1474                         free(ti_pbuff_start_addr);
1475
1476                         if (*total_remaining_blocks == 0)
1477                                 break;
1478                 }
1479                 /* write the grand parent block */
1480                 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1481                          ti_gp_buff_start_addr, fs->blksz);
1482                 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1483                 free(ti_gp_buff_start_addr);
1484                 return;
1485         }
1486 fail1:
1487         free(ti_pbuff_start_addr);
1488 fail:
1489         free(ti_gp_buff_start_addr);
1490 }
1491
1492 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1493                                 unsigned int total_remaining_blocks,
1494                                 unsigned int *total_no_of_block)
1495 {
1496         short i;
1497         long int direct_blockno;
1498         unsigned int no_blks_reqd = 0;
1499
1500         /* allocation of direct blocks */
1501         for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1502                 direct_blockno = ext4fs_get_new_blk_no();
1503                 if (direct_blockno == -1) {
1504                         printf("no block left to assign\n");
1505                         return;
1506                 }
1507                 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1508                 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1509
1510                 total_remaining_blocks--;
1511         }
1512
1513         alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1514                                     &no_blks_reqd);
1515         alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1516                                     &no_blks_reqd);
1517         alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1518                                     &no_blks_reqd);
1519         *total_no_of_block += no_blks_reqd;
1520 }
1521
1522 #endif
1523
1524 static struct ext4_extent_header *ext4fs_get_extent_block
1525         (struct ext2_data *data, char *buf,
1526                 struct ext4_extent_header *ext_block,
1527                 uint32_t fileblock, int log2_blksz)
1528 {
1529         struct ext4_extent_idx *index;
1530         unsigned long long block;
1531         int blksz = EXT2_BLOCK_SIZE(data);
1532         int i;
1533
1534         while (1) {
1535                 index = (struct ext4_extent_idx *)(ext_block + 1);
1536
1537                 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1538                         return NULL;
1539
1540                 if (ext_block->eh_depth == 0)
1541                         return ext_block;
1542                 i = -1;
1543                 do {
1544                         i++;
1545                         if (i >= le16_to_cpu(ext_block->eh_entries))
1546                                 break;
1547                 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1548
1549                 if (--i < 0)
1550                         return NULL;
1551
1552                 block = le16_to_cpu(index[i].ei_leaf_hi);
1553                 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1554
1555                 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1556                                    buf))
1557                         ext_block = (struct ext4_extent_header *)buf;
1558                 else
1559                         return NULL;
1560         }
1561 }
1562
1563 static int ext4fs_blockgroup
1564         (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1565 {
1566         long int blkno;
1567         unsigned int blkoff, desc_per_blk;
1568         int log2blksz = get_fs()->dev_desc->log2blksz;
1569         int desc_size = get_fs()->gdsize;
1570
1571         desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size;
1572
1573         blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1574                         group / desc_per_blk;
1575         blkoff = (group % desc_per_blk) * desc_size;
1576
1577         debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1578               group, blkno, blkoff);
1579
1580         return ext4fs_devread((lbaint_t)blkno <<
1581                               (LOG2_BLOCK_SIZE(data) - log2blksz),
1582                               blkoff, desc_size, (char *)blkgrp);
1583 }
1584
1585 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1586 {
1587         struct ext2_block_group blkgrp;
1588         struct ext2_sblock *sblock = &data->sblock;
1589         struct ext_filesystem *fs = get_fs();
1590         int log2blksz = get_fs()->dev_desc->log2blksz;
1591         int inodes_per_block, status;
1592         long int blkno;
1593         unsigned int blkoff;
1594
1595         /* It is easier to calculate if the first inode is 0. */
1596         ino--;
1597         status = ext4fs_blockgroup(data, ino / le32_to_cpu
1598                                    (sblock->inodes_per_group), &blkgrp);
1599         if (status == 0)
1600                 return 0;
1601
1602         inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1603         blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) +
1604             (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1605         blkoff = (ino % inodes_per_block) * fs->inodesz;
1606         /* Read the inode. */
1607         status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1608                                 log2blksz), blkoff,
1609                                 sizeof(struct ext2_inode), (char *)inode);
1610         if (status == 0)
1611                 return 0;
1612
1613         return 1;
1614 }
1615
1616 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1617 {
1618         long int blknr;
1619         int blksz;
1620         int log2_blksz;
1621         int status;
1622         long int rblock;
1623         long int perblock_parent;
1624         long int perblock_child;
1625         unsigned long long start;
1626         /* get the blocksize of the filesystem */
1627         blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1628         log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1629                 - get_fs()->dev_desc->log2blksz;
1630
1631         if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1632                 long int startblock, endblock;
1633                 char *buf = zalloc(blksz);
1634                 if (!buf)
1635                         return -ENOMEM;
1636                 struct ext4_extent_header *ext_block;
1637                 struct ext4_extent *extent;
1638                 int i;
1639                 ext_block =
1640                         ext4fs_get_extent_block(ext4fs_root, buf,
1641                                                 (struct ext4_extent_header *)
1642                                                 inode->b.blocks.dir_blocks,
1643                                                 fileblock, log2_blksz);
1644                 if (!ext_block) {
1645                         printf("invalid extent block\n");
1646                         free(buf);
1647                         return -EINVAL;
1648                 }
1649
1650                 extent = (struct ext4_extent *)(ext_block + 1);
1651
1652                 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) {
1653                         startblock = le32_to_cpu(extent[i].ee_block);
1654                         endblock = startblock + le16_to_cpu(extent[i].ee_len);
1655
1656                         if (startblock > fileblock) {
1657                                 /* Sparse file */
1658                                 free(buf);
1659                                 return 0;
1660
1661                         } else if (fileblock < endblock) {
1662                                 start = le16_to_cpu(extent[i].ee_start_hi);
1663                                 start = (start << 32) +
1664                                         le32_to_cpu(extent[i].ee_start_lo);
1665                                 free(buf);
1666                                 return (fileblock - startblock) + start;
1667                         }
1668                 }
1669
1670                 free(buf);
1671                 return 0;
1672         }
1673
1674         /* Direct blocks. */
1675         if (fileblock < INDIRECT_BLOCKS)
1676                 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1677
1678         /* Indirect. */
1679         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1680                 if (ext4fs_indir1_block == NULL) {
1681                         ext4fs_indir1_block = zalloc(blksz);
1682                         if (ext4fs_indir1_block == NULL) {
1683                                 printf("** SI ext2fs read block (indir 1)"
1684                                         "malloc failed. **\n");
1685                                 return -1;
1686                         }
1687                         ext4fs_indir1_size = blksz;
1688                         ext4fs_indir1_blkno = -1;
1689                 }
1690                 if (blksz != ext4fs_indir1_size) {
1691                         free(ext4fs_indir1_block);
1692                         ext4fs_indir1_block = NULL;
1693                         ext4fs_indir1_size = 0;
1694                         ext4fs_indir1_blkno = -1;
1695                         ext4fs_indir1_block = zalloc(blksz);
1696                         if (ext4fs_indir1_block == NULL) {
1697                                 printf("** SI ext2fs read block (indir 1):"
1698                                         "malloc failed. **\n");
1699                                 return -1;
1700                         }
1701                         ext4fs_indir1_size = blksz;
1702                 }
1703                 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1704                      log2_blksz) != ext4fs_indir1_blkno) {
1705                         status =
1706                             ext4fs_devread((lbaint_t)le32_to_cpu
1707                                            (inode->b.blocks.
1708                                             indir_block) << log2_blksz, 0,
1709                                            blksz, (char *)ext4fs_indir1_block);
1710                         if (status == 0) {
1711                                 printf("** SI ext2fs read block (indir 1)"
1712                                         "failed. **\n");
1713                                 return -1;
1714                         }
1715                         ext4fs_indir1_blkno =
1716                                 le32_to_cpu(inode->b.blocks.
1717                                                indir_block) << log2_blksz;
1718                 }
1719                 blknr = le32_to_cpu(ext4fs_indir1_block
1720                                       [fileblock - INDIRECT_BLOCKS]);
1721         }
1722         /* Double indirect. */
1723         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1724                                         (blksz / 4 + 1)))) {
1725
1726                 long int perblock = blksz / 4;
1727                 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1728
1729                 if (ext4fs_indir1_block == NULL) {
1730                         ext4fs_indir1_block = zalloc(blksz);
1731                         if (ext4fs_indir1_block == NULL) {
1732                                 printf("** DI ext2fs read block (indir 2 1)"
1733                                         "malloc failed. **\n");
1734                                 return -1;
1735                         }
1736                         ext4fs_indir1_size = blksz;
1737                         ext4fs_indir1_blkno = -1;
1738                 }
1739                 if (blksz != ext4fs_indir1_size) {
1740                         free(ext4fs_indir1_block);
1741                         ext4fs_indir1_block = NULL;
1742                         ext4fs_indir1_size = 0;
1743                         ext4fs_indir1_blkno = -1;
1744                         ext4fs_indir1_block = zalloc(blksz);
1745                         if (ext4fs_indir1_block == NULL) {
1746                                 printf("** DI ext2fs read block (indir 2 1)"
1747                                         "malloc failed. **\n");
1748                                 return -1;
1749                         }
1750                         ext4fs_indir1_size = blksz;
1751                 }
1752                 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1753                      log2_blksz) != ext4fs_indir1_blkno) {
1754                         status =
1755                             ext4fs_devread((lbaint_t)le32_to_cpu
1756                                            (inode->b.blocks.
1757                                             double_indir_block) << log2_blksz,
1758                                            0, blksz,
1759                                            (char *)ext4fs_indir1_block);
1760                         if (status == 0) {
1761                                 printf("** DI ext2fs read block (indir 2 1)"
1762                                         "failed. **\n");
1763                                 return -1;
1764                         }
1765                         ext4fs_indir1_blkno =
1766                             le32_to_cpu(inode->b.blocks.double_indir_block) <<
1767                             log2_blksz;
1768                 }
1769
1770                 if (ext4fs_indir2_block == NULL) {
1771                         ext4fs_indir2_block = zalloc(blksz);
1772                         if (ext4fs_indir2_block == NULL) {
1773                                 printf("** DI ext2fs read block (indir 2 2)"
1774                                         "malloc failed. **\n");
1775                                 return -1;
1776                         }
1777                         ext4fs_indir2_size = blksz;
1778                         ext4fs_indir2_blkno = -1;
1779                 }
1780                 if (blksz != ext4fs_indir2_size) {
1781                         free(ext4fs_indir2_block);
1782                         ext4fs_indir2_block = NULL;
1783                         ext4fs_indir2_size = 0;
1784                         ext4fs_indir2_blkno = -1;
1785                         ext4fs_indir2_block = zalloc(blksz);
1786                         if (ext4fs_indir2_block == NULL) {
1787                                 printf("** DI ext2fs read block (indir 2 2)"
1788                                         "malloc failed. **\n");
1789                                 return -1;
1790                         }
1791                         ext4fs_indir2_size = blksz;
1792                 }
1793                 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1794                      log2_blksz) != ext4fs_indir2_blkno) {
1795                         status = ext4fs_devread((lbaint_t)le32_to_cpu
1796                                                 (ext4fs_indir1_block
1797                                                  [rblock /
1798                                                   perblock]) << log2_blksz, 0,
1799                                                 blksz,
1800                                                 (char *)ext4fs_indir2_block);
1801                         if (status == 0) {
1802                                 printf("** DI ext2fs read block (indir 2 2)"
1803                                         "failed. **\n");
1804                                 return -1;
1805                         }
1806                         ext4fs_indir2_blkno =
1807                             le32_to_cpu(ext4fs_indir1_block[rblock
1808                                                               /
1809                                                               perblock]) <<
1810                             log2_blksz;
1811                 }
1812                 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1813         }
1814         /* Tripple indirect. */
1815         else {
1816                 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1817                                       (blksz / 4 * blksz / 4));
1818                 perblock_child = blksz / 4;
1819                 perblock_parent = ((blksz / 4) * (blksz / 4));
1820
1821                 if (ext4fs_indir1_block == NULL) {
1822                         ext4fs_indir1_block = zalloc(blksz);
1823                         if (ext4fs_indir1_block == NULL) {
1824                                 printf("** TI ext2fs read block (indir 2 1)"
1825                                         "malloc failed. **\n");
1826                                 return -1;
1827                         }
1828                         ext4fs_indir1_size = blksz;
1829                         ext4fs_indir1_blkno = -1;
1830                 }
1831                 if (blksz != ext4fs_indir1_size) {
1832                         free(ext4fs_indir1_block);
1833                         ext4fs_indir1_block = NULL;
1834                         ext4fs_indir1_size = 0;
1835                         ext4fs_indir1_blkno = -1;
1836                         ext4fs_indir1_block = zalloc(blksz);
1837                         if (ext4fs_indir1_block == NULL) {
1838                                 printf("** TI ext2fs read block (indir 2 1)"
1839                                         "malloc failed. **\n");
1840                                 return -1;
1841                         }
1842                         ext4fs_indir1_size = blksz;
1843                 }
1844                 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1845                      log2_blksz) != ext4fs_indir1_blkno) {
1846                         status = ext4fs_devread
1847                             ((lbaint_t)
1848                              le32_to_cpu(inode->b.blocks.triple_indir_block)
1849                              << log2_blksz, 0, blksz,
1850                              (char *)ext4fs_indir1_block);
1851                         if (status == 0) {
1852                                 printf("** TI ext2fs read block (indir 2 1)"
1853                                         "failed. **\n");
1854                                 return -1;
1855                         }
1856                         ext4fs_indir1_blkno =
1857                             le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1858                             log2_blksz;
1859                 }
1860
1861                 if (ext4fs_indir2_block == NULL) {
1862                         ext4fs_indir2_block = zalloc(blksz);
1863                         if (ext4fs_indir2_block == NULL) {
1864                                 printf("** TI ext2fs read block (indir 2 2)"
1865                                         "malloc failed. **\n");
1866                                 return -1;
1867                         }
1868                         ext4fs_indir2_size = blksz;
1869                         ext4fs_indir2_blkno = -1;
1870                 }
1871                 if (blksz != ext4fs_indir2_size) {
1872                         free(ext4fs_indir2_block);
1873                         ext4fs_indir2_block = NULL;
1874                         ext4fs_indir2_size = 0;
1875                         ext4fs_indir2_blkno = -1;
1876                         ext4fs_indir2_block = zalloc(blksz);
1877                         if (ext4fs_indir2_block == NULL) {
1878                                 printf("** TI ext2fs read block (indir 2 2)"
1879                                         "malloc failed. **\n");
1880                                 return -1;
1881                         }
1882                         ext4fs_indir2_size = blksz;
1883                 }
1884                 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1885                                                        perblock_parent]) <<
1886                      log2_blksz)
1887                     != ext4fs_indir2_blkno) {
1888                         status = ext4fs_devread((lbaint_t)le32_to_cpu
1889                                                 (ext4fs_indir1_block
1890                                                  [rblock /
1891                                                   perblock_parent]) <<
1892                                                 log2_blksz, 0, blksz,
1893                                                 (char *)ext4fs_indir2_block);
1894                         if (status == 0) {
1895                                 printf("** TI ext2fs read block (indir 2 2)"
1896                                         "failed. **\n");
1897                                 return -1;
1898                         }
1899                         ext4fs_indir2_blkno =
1900                             le32_to_cpu(ext4fs_indir1_block[rblock /
1901                                                               perblock_parent])
1902                             << log2_blksz;
1903                 }
1904
1905                 if (ext4fs_indir3_block == NULL) {
1906                         ext4fs_indir3_block = zalloc(blksz);
1907                         if (ext4fs_indir3_block == NULL) {
1908                                 printf("** TI ext2fs read block (indir 2 2)"
1909                                         "malloc failed. **\n");
1910                                 return -1;
1911                         }
1912                         ext4fs_indir3_size = blksz;
1913                         ext4fs_indir3_blkno = -1;
1914                 }
1915                 if (blksz != ext4fs_indir3_size) {
1916                         free(ext4fs_indir3_block);
1917                         ext4fs_indir3_block = NULL;
1918                         ext4fs_indir3_size = 0;
1919                         ext4fs_indir3_blkno = -1;
1920                         ext4fs_indir3_block = zalloc(blksz);
1921                         if (ext4fs_indir3_block == NULL) {
1922                                 printf("** TI ext2fs read block (indir 2 2)"
1923                                         "malloc failed. **\n");
1924                                 return -1;
1925                         }
1926                         ext4fs_indir3_size = blksz;
1927                 }
1928                 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1929                                                        /
1930                                                        perblock_child]) <<
1931                      log2_blksz) != ext4fs_indir3_blkno) {
1932                         status =
1933                             ext4fs_devread((lbaint_t)le32_to_cpu
1934                                            (ext4fs_indir2_block
1935                                             [(rblock / perblock_child)
1936                                              % (blksz / 4)]) << log2_blksz, 0,
1937                                            blksz, (char *)ext4fs_indir3_block);
1938                         if (status == 0) {
1939                                 printf("** TI ext2fs read block (indir 2 2)"
1940                                        "failed. **\n");
1941                                 return -1;
1942                         }
1943                         ext4fs_indir3_blkno =
1944                             le32_to_cpu(ext4fs_indir2_block[(rblock /
1945                                                                perblock_child) %
1946                                                               (blksz /
1947                                                                4)]) <<
1948                             log2_blksz;
1949                 }
1950
1951                 blknr = le32_to_cpu(ext4fs_indir3_block
1952                                       [rblock % perblock_child]);
1953         }
1954         debug("read_allocated_block %ld\n", blknr);
1955
1956         return blknr;
1957 }
1958
1959 /**
1960  * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1961  *                          global pointers
1962  *
1963  * This function assures that for a file with the same name but different size
1964  * the sequential store on the ext4 filesystem will be correct.
1965  *
1966  * In this function the global data, responsible for internal representation
1967  * of the ext4 data are initialized to the reset state. Without this, during
1968  * replacement of the smaller file with the bigger truncation of new file was
1969  * performed.
1970  */
1971 void ext4fs_reinit_global(void)
1972 {
1973         if (ext4fs_indir1_block != NULL) {
1974                 free(ext4fs_indir1_block);
1975                 ext4fs_indir1_block = NULL;
1976                 ext4fs_indir1_size = 0;
1977                 ext4fs_indir1_blkno = -1;
1978         }
1979         if (ext4fs_indir2_block != NULL) {
1980                 free(ext4fs_indir2_block);
1981                 ext4fs_indir2_block = NULL;
1982                 ext4fs_indir2_size = 0;
1983                 ext4fs_indir2_blkno = -1;
1984         }
1985         if (ext4fs_indir3_block != NULL) {
1986                 free(ext4fs_indir3_block);
1987                 ext4fs_indir3_block = NULL;
1988                 ext4fs_indir3_size = 0;
1989                 ext4fs_indir3_blkno = -1;
1990         }
1991 }
1992 void ext4fs_close(void)
1993 {
1994         if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1995                 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1996                 ext4fs_file = NULL;
1997         }
1998         if (ext4fs_root != NULL) {
1999                 free(ext4fs_root);
2000                 ext4fs_root = NULL;
2001         }
2002
2003         ext4fs_reinit_global();
2004 }
2005
2006 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
2007                                 struct ext2fs_node **fnode, int *ftype)
2008 {
2009         unsigned int fpos = 0;
2010         int status;
2011         loff_t actread;
2012         struct ext2fs_node *diro = (struct ext2fs_node *) dir;
2013
2014 #ifdef DEBUG
2015         if (name != NULL)
2016                 printf("Iterate dir %s\n", name);
2017 #endif /* of DEBUG */
2018         if (!diro->inode_read) {
2019                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2020                 if (status == 0)
2021                         return 0;
2022         }
2023         /* Search the file.  */
2024         while (fpos < le32_to_cpu(diro->inode.size)) {
2025                 struct ext2_dirent dirent;
2026
2027                 status = ext4fs_read_file(diro, fpos,
2028                                            sizeof(struct ext2_dirent),
2029                                            (char *)&dirent, &actread);
2030                 if (status < 0)
2031                         return 0;
2032
2033                 if (dirent.direntlen == 0) {
2034                         printf("Failed to iterate over directory %s\n", name);
2035                         return 0;
2036                 }
2037
2038                 if (dirent.namelen != 0) {
2039                         char filename[dirent.namelen + 1];
2040                         struct ext2fs_node *fdiro;
2041                         int type = FILETYPE_UNKNOWN;
2042
2043                         status = ext4fs_read_file(diro,
2044                                                   fpos +
2045                                                   sizeof(struct ext2_dirent),
2046                                                   dirent.namelen, filename,
2047                                                   &actread);
2048                         if (status < 0)
2049                                 return 0;
2050
2051                         fdiro = zalloc(sizeof(struct ext2fs_node));
2052                         if (!fdiro)
2053                                 return 0;
2054
2055                         fdiro->data = diro->data;
2056                         fdiro->ino = le32_to_cpu(dirent.inode);
2057
2058                         filename[dirent.namelen] = '\0';
2059
2060                         if (dirent.filetype != FILETYPE_UNKNOWN) {
2061                                 fdiro->inode_read = 0;
2062
2063                                 if (dirent.filetype == FILETYPE_DIRECTORY)
2064                                         type = FILETYPE_DIRECTORY;
2065                                 else if (dirent.filetype == FILETYPE_SYMLINK)
2066                                         type = FILETYPE_SYMLINK;
2067                                 else if (dirent.filetype == FILETYPE_REG)
2068                                         type = FILETYPE_REG;
2069                         } else {
2070                                 status = ext4fs_read_inode(diro->data,
2071                                                            le32_to_cpu
2072                                                            (dirent.inode),
2073                                                            &fdiro->inode);
2074                                 if (status == 0) {
2075                                         free(fdiro);
2076                                         return 0;
2077                                 }
2078                                 fdiro->inode_read = 1;
2079
2080                                 if ((le16_to_cpu(fdiro->inode.mode) &
2081                                      FILETYPE_INO_MASK) ==
2082                                     FILETYPE_INO_DIRECTORY) {
2083                                         type = FILETYPE_DIRECTORY;
2084                                 } else if ((le16_to_cpu(fdiro->inode.mode)
2085                                             & FILETYPE_INO_MASK) ==
2086                                            FILETYPE_INO_SYMLINK) {
2087                                         type = FILETYPE_SYMLINK;
2088                                 } else if ((le16_to_cpu(fdiro->inode.mode)
2089                                             & FILETYPE_INO_MASK) ==
2090                                            FILETYPE_INO_REG) {
2091                                         type = FILETYPE_REG;
2092                                 }
2093                         }
2094 #ifdef DEBUG
2095                         printf("iterate >%s<\n", filename);
2096 #endif /* of DEBUG */
2097                         if ((name != NULL) && (fnode != NULL)
2098                             && (ftype != NULL)) {
2099                                 if (strcmp(filename, name) == 0) {
2100                                         *ftype = type;
2101                                         *fnode = fdiro;
2102                                         return 1;
2103                                 }
2104                         } else {
2105                                 if (fdiro->inode_read == 0) {
2106                                         status = ext4fs_read_inode(diro->data,
2107                                                                  le32_to_cpu(
2108                                                                  dirent.inode),
2109                                                                  &fdiro->inode);
2110                                         if (status == 0) {
2111                                                 free(fdiro);
2112                                                 return 0;
2113                                         }
2114                                         fdiro->inode_read = 1;
2115                                 }
2116                                 switch (type) {
2117                                 case FILETYPE_DIRECTORY:
2118                                         printf("<DIR> ");
2119                                         break;
2120                                 case FILETYPE_SYMLINK:
2121                                         printf("<SYM> ");
2122                                         break;
2123                                 case FILETYPE_REG:
2124                                         printf("      ");
2125                                         break;
2126                                 default:
2127                                         printf("< ? > ");
2128                                         break;
2129                                 }
2130                                 printf("%10u %s\n",
2131                                        le32_to_cpu(fdiro->inode.size),
2132                                         filename);
2133                         }
2134                         free(fdiro);
2135                 }
2136                 fpos += le16_to_cpu(dirent.direntlen);
2137         }
2138         return 0;
2139 }
2140
2141 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2142 {
2143         char *symlink;
2144         struct ext2fs_node *diro = node;
2145         int status;
2146         loff_t actread;
2147
2148         if (!diro->inode_read) {
2149                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2150                 if (status == 0)
2151                         return NULL;
2152         }
2153         symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2154         if (!symlink)
2155                 return NULL;
2156
2157         if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2158                 strncpy(symlink, diro->inode.b.symlink,
2159                          le32_to_cpu(diro->inode.size));
2160         } else {
2161                 status = ext4fs_read_file(diro, 0,
2162                                            le32_to_cpu(diro->inode.size),
2163                                            symlink, &actread);
2164                 if ((status < 0) || (actread == 0)) {
2165                         free(symlink);
2166                         return NULL;
2167                 }
2168         }
2169         symlink[le32_to_cpu(diro->inode.size)] = '\0';
2170         return symlink;
2171 }
2172
2173 static int ext4fs_find_file1(const char *currpath,
2174                              struct ext2fs_node *currroot,
2175                              struct ext2fs_node **currfound, int *foundtype)
2176 {
2177         char fpath[strlen(currpath) + 1];
2178         char *name = fpath;
2179         char *next;
2180         int status;
2181         int type = FILETYPE_DIRECTORY;
2182         struct ext2fs_node *currnode = currroot;
2183         struct ext2fs_node *oldnode = currroot;
2184
2185         strncpy(fpath, currpath, strlen(currpath) + 1);
2186
2187         /* Remove all leading slashes. */
2188         while (*name == '/')
2189                 name++;
2190
2191         if (!*name) {
2192                 *currfound = currnode;
2193                 return 1;
2194         }
2195
2196         for (;;) {
2197                 int found;
2198
2199                 /* Extract the actual part from the pathname. */
2200                 next = strchr(name, '/');
2201                 if (next) {
2202                         /* Remove all leading slashes. */
2203                         while (*next == '/')
2204                                 *(next++) = '\0';
2205                 }
2206
2207                 if (type != FILETYPE_DIRECTORY) {
2208                         ext4fs_free_node(currnode, currroot);
2209                         return 0;
2210                 }
2211
2212                 oldnode = currnode;
2213
2214                 /* Iterate over the directory. */
2215                 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2216                 if (found == 0)
2217                         return 0;
2218
2219                 if (found == -1)
2220                         break;
2221
2222                 /* Read in the symlink and follow it. */
2223                 if (type == FILETYPE_SYMLINK) {
2224                         char *symlink;
2225
2226                         /* Test if the symlink does not loop. */
2227                         if (++symlinknest == 8) {
2228                                 ext4fs_free_node(currnode, currroot);
2229                                 ext4fs_free_node(oldnode, currroot);
2230                                 return 0;
2231                         }
2232
2233                         symlink = ext4fs_read_symlink(currnode);
2234                         ext4fs_free_node(currnode, currroot);
2235
2236                         if (!symlink) {
2237                                 ext4fs_free_node(oldnode, currroot);
2238                                 return 0;
2239                         }
2240
2241                         debug("Got symlink >%s<\n", symlink);
2242
2243                         if (symlink[0] == '/') {
2244                                 ext4fs_free_node(oldnode, currroot);
2245                                 oldnode = &ext4fs_root->diropen;
2246                         }
2247
2248                         /* Lookup the node the symlink points to. */
2249                         status = ext4fs_find_file1(symlink, oldnode,
2250                                                     &currnode, &type);
2251
2252                         free(symlink);
2253
2254                         if (status == 0) {
2255                                 ext4fs_free_node(oldnode, currroot);
2256                                 return 0;
2257                         }
2258                 }
2259
2260                 ext4fs_free_node(oldnode, currroot);
2261
2262                 /* Found the node! */
2263                 if (!next || *next == '\0') {
2264                         *currfound = currnode;
2265                         *foundtype = type;
2266                         return 1;
2267                 }
2268                 name = next;
2269         }
2270         return -1;
2271 }
2272
2273 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2274         struct ext2fs_node **foundnode, int expecttype)
2275 {
2276         int status;
2277         int foundtype = FILETYPE_DIRECTORY;
2278
2279         symlinknest = 0;
2280         if (!path)
2281                 return 0;
2282
2283         status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2284         if (status == 0)
2285                 return 0;
2286
2287         /* Check if the node that was found was of the expected type. */
2288         if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2289                 return 0;
2290         else if ((expecttype == FILETYPE_DIRECTORY)
2291                    && (foundtype != expecttype))
2292                 return 0;
2293
2294         return 1;
2295 }
2296
2297 int ext4fs_open(const char *filename, loff_t *len)
2298 {
2299         struct ext2fs_node *fdiro = NULL;
2300         int status;
2301
2302         if (ext4fs_root == NULL)
2303                 return -1;
2304
2305         ext4fs_file = NULL;
2306         status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2307                                   FILETYPE_REG);
2308         if (status == 0)
2309                 goto fail;
2310
2311         if (!fdiro->inode_read) {
2312                 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2313                                 &fdiro->inode);
2314                 if (status == 0)
2315                         goto fail;
2316         }
2317         *len = le32_to_cpu(fdiro->inode.size);
2318         ext4fs_file = fdiro;
2319
2320         return 0;
2321 fail:
2322         ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2323
2324         return -1;
2325 }
2326
2327 int ext4fs_mount(unsigned part_length)
2328 {
2329         struct ext2_data *data;
2330         int status;
2331         struct ext_filesystem *fs = get_fs();
2332         data = zalloc(SUPERBLOCK_SIZE);
2333         if (!data)
2334                 return 0;
2335
2336         /* Read the superblock. */
2337         status = ext4_read_superblock((char *)&data->sblock);
2338
2339         if (status == 0)
2340                 goto fail;
2341
2342         /* Make sure this is an ext2 filesystem. */
2343         if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2344                 goto fail_noerr;
2345
2346
2347         if (le32_to_cpu(data->sblock.revision_level) == 0) {
2348                 fs->inodesz = 128;
2349                 fs->gdsize = 32;
2350         } else {
2351                 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2352                       __le32_to_cpu(data->sblock.feature_compatibility),
2353                       __le32_to_cpu(data->sblock.feature_incompat),
2354                       __le32_to_cpu(data->sblock.feature_ro_compat));
2355
2356                 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2357                 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2358                         EXT4_FEATURE_INCOMPAT_64BIT ?
2359                         le16_to_cpu(data->sblock.descriptor_size) : 32;
2360         }
2361
2362         debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2363               le32_to_cpu(data->sblock.revision_level),
2364               fs->inodesz, fs->gdsize);
2365
2366         data->diropen.data = data;
2367         data->diropen.ino = 2;
2368         data->diropen.inode_read = 1;
2369         data->inode = &data->diropen.inode;
2370
2371         status = ext4fs_read_inode(data, 2, data->inode);
2372         if (status == 0)
2373                 goto fail;
2374
2375         ext4fs_root = data;
2376
2377         return 1;
2378 fail:
2379         printf("Failed to mount ext2 filesystem...\n");
2380 fail_noerr:
2381         free(data);
2382         ext4fs_root = NULL;
2383
2384         return 0;
2385 }