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, const 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                                                       NULL);
 515         if (first_block_no_of_root <= 0)
 516                 goto fail;
 517
 518         status = ext4fs_devread((lbaint_t)first_block_no_of_root
 519                                 * fs->sect_perblk,
 520                                 0, fs->blksz, root_first_block_buffer);
 521         if (status == 0)
 522                 goto fail;
 523
 524         if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
 525                 goto fail;
 526         dir = (struct ext2_dirent *)root_first_block_buffer;
 527         totalbytes = 0;
 528
 529         while (le16_to_cpu(dir->direntlen) > 0) {
 530                 unsigned short used_len = ROUND(dir->namelen +
 531                     sizeof(struct ext2_dirent), 4);
 532
 533                 /* last entry of block */
 534                 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) {
 535
 536                         /* check if new entry fits */
 537                         if ((used_len + new_entry_byte_reqd) <=
 538                             le16_to_cpu(dir->direntlen)) {
 539                                 dir->direntlen = cpu_to_le16(used_len);
 540                                 break;
 541                         } else {
 542                                 if (blk_idx > 0) {
 543                                         printf("Block full, trying previous\n");
 544                                         blk_idx--;
 545                                         goto restart_read;
 546                                 }
 547                                 printf("All blocks full: Allocate new\n");
 548
 549                                 if (le32_to_cpu(g_parent_inode->flags) &
 550                                                 EXT4_EXTENTS_FL) {
 551                                         printf("Directory uses extents\n");
 552                                         goto fail;
 553                                 }
 554                                 if (directory_blocks >= INDIRECT_BLOCKS) {
 555                                         printf("Directory exceeds limit\n");
 556                                         goto fail;
 557                                 }
 558                                 new_blk_no = ext4fs_get_new_blk_no();
 559                                 if (new_blk_no == -1) {
 560                                         printf("no block left to assign\n");
 561                                         goto fail;
 562                                 }
 563                                 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz);
 564                                 g_parent_inode->b.blocks.
 565                                         dir_blocks[directory_blocks] =
 566                                         cpu_to_le32(new_blk_no);
 567
 568                                 new_size = le32_to_cpu(g_parent_inode->size);
 569                                 new_size += fs->blksz;
 570                                 g_parent_inode->size = cpu_to_le32(new_size);
 571
 572                                 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt);
 573                                 new_blockcnt += fs->blksz >> LOG2_SECTOR_SIZE;
 574                                 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt);
 575
 576                                 if (ext4fs_put_metadata
 577                                     (root_first_block_buffer,
 578                                      first_block_no_of_root))
 579                                         goto fail;
 580                                 goto restart;
 581                         }
 582                 }
 583
 584                 templength = le16_to_cpu(dir->direntlen);
 585                 totalbytes = totalbytes + templength;
 586                 sizeof_void_space = check_void_in_dentry(dir, filename);
 587                 if (sizeof_void_space)
 588                         break;
 589
 590                 dir = (struct ext2_dirent *)((char *)dir + templength);
 591         }
 592
 593         /* make a pointer ready for creating next directory entry */
 594         templength = le16_to_cpu(dir->direntlen);
 595         totalbytes = totalbytes + templength;
 596         dir = (struct ext2_dirent *)((char *)dir + templength);
 597
 598         /* get the next available inode number */
 599         inodeno = ext4fs_get_new_inode_no();
 600         if (inodeno == -1) {
 601                 printf("no inode left to assign\n");
 602                 goto fail;
 603         }
 604         dir->inode = cpu_to_le32(inodeno);
 605         if (sizeof_void_space)
 606                 dir->direntlen = cpu_to_le16(sizeof_void_space);
 607         else
 608                 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes);
 609
 610         dir->namelen = strlen(filename);
 611         dir->filetype = file_type;
 612         temp_dir = (char *)dir;
 613         temp_dir = temp_dir + sizeof(struct ext2_dirent);
 614         memcpy(temp_dir, filename, strlen(filename));
 615
 616         /* update or write  the 1st block of root inode */
 617         if (ext4fs_put_metadata(root_first_block_buffer,
 618                                 first_block_no_of_root))
 619                 goto fail;
 620
 621 fail:
 622         free(zero_buffer);
 623         free(root_first_block_buffer);
 624
 625         return inodeno;
 626 }
 627
 628 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
 629 {
 630         int status;
 631         int inodeno = 0;
 632         int offset;
 633         int blk_idx;
 634         long int blknr;
 635         char *block_buffer = NULL;
 636         struct ext2_dirent *dir = NULL;
 637         struct ext_filesystem *fs = get_fs();
 638         uint32_t directory_blocks;
 639         char *direntname;
 640
 641         directory_blocks = le32_to_cpu(parent_inode->size) >>
 642                 LOG2_BLOCK_SIZE(ext4fs_root);
 643
 644         block_buffer = zalloc(fs->blksz);
 645         if (!block_buffer)
 646                 goto fail;
 647
 648         /* get the block no allocated to a file */
 649         for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
 650                 blknr = read_allocated_block(parent_inode, blk_idx, NULL);
 651                 if (blknr <= 0)
 652                         goto fail;
 653
 654                 /* read the directory block */
 655                 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
 656                                         0, fs->blksz, (char *)block_buffer);
 657                 if (status == 0)
 658                         goto fail;
 659
 660                 offset = 0;
 661                 do {
 662                         if (offset & 3) {
 663                                 printf("Badly aligned ext2_dirent\n");
 664                                 break;
 665                         }
 666
 667                         dir = (struct ext2_dirent *)(block_buffer + offset);
 668                         direntname = (char*)(dir) + sizeof(struct ext2_dirent);
 669
 670                         int direntlen = le16_to_cpu(dir->direntlen);
 671                         if (direntlen < sizeof(struct ext2_dirent))
 672                                 break;
 673
 674                         if (dir->inode && (strlen(dirname) == dir->namelen) &&
 675                             (strncmp(dirname, direntname, dir->namelen) == 0)) {
 676                                 inodeno = le32_to_cpu(dir->inode);
 677                                 break;
 678                         }
 679
 680                         offset += direntlen;
 681
 682                 } while (offset < fs->blksz);
 683
 684                 if (inodeno > 0) {
 685                         free(block_buffer);
 686                         return inodeno;
 687                 }
 688         }
 689
 690 fail:
 691         free(block_buffer);
 692
 693         return -1;
 694 }
 695
 696 static int find_dir_depth(char *dirname)
 697 {
 698         char *token = strtok(dirname, "/");
 699         int count = 0;
 700         while (token != NULL) {
 701                 token = strtok(NULL, "/");
 702                 count++;
 703         }
 704         return count + 1 + 1;
 705         /*
 706          * for example  for string /home/temp
 707          * depth=home(1)+temp(1)+1 extra for NULL;
 708          * so count is 4;
 709          */
 710 }
 711
 712 static int parse_path(char **arr, char *dirname)
 713 {
 714         char *token = strtok(dirname, "/");
 715         int i = 0;
 716
 717         /* add root */
 718         arr[i] = zalloc(strlen("/") + 1);
 719         if (!arr[i])
 720                 return -ENOMEM;
 721         memcpy(arr[i++], "/", strlen("/"));
 722
 723         /* add each path entry after root */
 724         while (token != NULL) {
 725                 arr[i] = zalloc(strlen(token) + 1);
 726                 if (!arr[i])
 727                         return -ENOMEM;
 728                 memcpy(arr[i++], token, strlen(token));
 729                 token = strtok(NULL, "/");
 730         }
 731         arr[i] = NULL;
 732
 733         return 0;
 734 }
 735
 736 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
 737 {
 738         if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
 739                 return -1;
 740
 741         return 0;
 742 }
 743
 744 /*
 745  * Function: ext4fs_get_parent_inode_num
 746  * Return Value: inode Number of the parent directory of  file/Directory to be
 747  * created
 748  * dirname : Input parmater, input path name of the file/directory to be created
 749  * dname : Output parameter, to be filled with the name of the directory
 750  * extracted from dirname
 751  */
 752 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
 753 {
 754         int i;
 755         int depth = 0;
 756         int matched_inode_no;
 757         int result_inode_no = -1;
 758         char **ptr = NULL;
 759         char *depth_dirname = NULL;
 760         char *parse_dirname = NULL;
 761         struct ext2_inode *parent_inode = NULL;
 762         struct ext2_inode *first_inode = NULL;
 763         struct ext2_inode temp_inode;
 764
 765         if (*dirname != '/') {
 766                 printf("Please supply Absolute path\n");
 767                 return -1;
 768         }
 769
 770         /* TODO: input validation make equivalent to linux */
 771         depth_dirname = zalloc(strlen(dirname) + 1);
 772         if (!depth_dirname)
 773                 return -ENOMEM;
 774
 775         memcpy(depth_dirname, dirname, strlen(dirname));
 776         depth = find_dir_depth(depth_dirname);
 777         parse_dirname = zalloc(strlen(dirname) + 1);
 778         if (!parse_dirname)
 779                 goto fail;
 780         memcpy(parse_dirname, dirname, strlen(dirname));
 781
 782         /* allocate memory for each directory level */
 783         ptr = zalloc((depth) * sizeof(char *));
 784         if (!ptr)
 785                 goto fail;
 786         if (parse_path(ptr, parse_dirname))
 787                 goto fail;
 788         parent_inode = zalloc(sizeof(struct ext2_inode));
 789         if (!parent_inode)
 790                 goto fail;
 791         first_inode = zalloc(sizeof(struct ext2_inode));
 792         if (!first_inode)
 793                 goto fail;
 794         memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
 795         memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
 796         if (flags & F_FILE)
 797                 result_inode_no = EXT2_ROOT_INO;
 798         for (i = 1; i < depth; i++) {
 799                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 800                 if (matched_inode_no == -1) {
 801                         if (ptr[i + 1] == NULL && i == 1) {
 802                                 result_inode_no = EXT2_ROOT_INO;
 803                                 goto end;
 804                         } else {
 805                                 if (ptr[i + 1] == NULL)
 806                                         break;
 807                                 printf("Invalid path\n");
 808                                 result_inode_no = -1;
 809                                 goto fail;
 810                         }
 811                 } else {
 812                         if (ptr[i + 1] != NULL) {
 813                                 memset(parent_inode, '\0',
 814                                        sizeof(struct ext2_inode));
 815                                 if (ext4fs_iget(matched_inode_no,
 816                                                 parent_inode)) {
 817                                         result_inode_no = -1;
 818                                         goto fail;
 819                                 }
 820                                 result_inode_no = matched_inode_no;
 821                         } else {
 822                                 break;
 823                         }
 824                 }
 825         }
 826
 827 end:
 828         if (i == 1)
 829                 matched_inode_no = search_dir(first_inode, ptr[i]);
 830         else
 831                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 832
 833         if (matched_inode_no != -1) {
 834                 ext4fs_iget(matched_inode_no, &temp_inode);
 835                 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) {
 836                         printf("It is a Directory\n");
 837                         result_inode_no = -1;
 838                         goto fail;
 839                 }
 840         }
 841
 842         if (strlen(ptr[i]) > 256) {
 843                 result_inode_no = -1;
 844                 goto fail;
 845         }
 846         memcpy(dname, ptr[i], strlen(ptr[i]));
 847
 848 fail:
 849         free(depth_dirname);
 850         free(parse_dirname);
 851         for (i = 0; i < depth; i++) {
 852                 if (!ptr[i])
 853                         break;
 854                 free(ptr[i]);
 855         }
 856         free(ptr);
 857         free(parent_inode);
 858         free(first_inode);
 859
 860         return result_inode_no;
 861 }
 862
 863 static int unlink_filename(char *filename, unsigned int blknr)
 864 {
 865         int status;
 866         int inodeno = 0;
 867         int offset;
 868         char *block_buffer = NULL;
 869         struct ext2_dirent *dir = NULL;
 870         struct ext2_dirent *previous_dir;
 871         struct ext_filesystem *fs = get_fs();
 872         int ret = -1;
 873         char *direntname;
 874
 875         block_buffer = zalloc(fs->blksz);
 876         if (!block_buffer)
 877                 return -ENOMEM;
 878
 879         /* read the directory block */
 880         status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
 881                                 fs->blksz, block_buffer);
 882         if (status == 0)
 883                 goto fail;
 884
 885         offset = 0;
 886         do {
 887                 if (offset & 3) {
 888                         printf("Badly aligned ext2_dirent\n");
 889                         break;
 890                 }
 891
 892                 previous_dir = dir;
 893                 dir = (struct ext2_dirent *)(block_buffer + offset);
 894                 direntname = (char *)(dir) + sizeof(struct ext2_dirent);
 895
 896                 int direntlen = le16_to_cpu(dir->direntlen);
 897                 if (direntlen < sizeof(struct ext2_dirent))
 898                         break;
 899
 900                 if (dir->inode && (strlen(filename) == dir->namelen) &&
 901                     (strncmp(direntname, filename, dir->namelen) == 0)) {
 902                         inodeno = le32_to_cpu(dir->inode);
 903                         break;
 904                 }
 905
 906                 offset += direntlen;
 907
 908         } while (offset < fs->blksz);
 909
 910         if (inodeno > 0) {
 911                 printf("file found, deleting\n");
 912                 if (ext4fs_log_journal(block_buffer, blknr))
 913                         goto fail;
 914
 915                 if (previous_dir) {
 916                         /* merge dir entry with predecessor */
 917                         uint16_t new_len;
 918                         new_len = le16_to_cpu(previous_dir->direntlen);
 919                         new_len += le16_to_cpu(dir->direntlen);
 920                         previous_dir->direntlen = cpu_to_le16(new_len);
 921                 } else {
 922                         /* invalidate dir entry */
 923                         dir->inode = 0;
 924                 }
 925                 if (ext4fs_put_metadata(block_buffer, blknr))
 926                         goto fail;
 927                 ret = inodeno;
 928         }
 929 fail:
 930         free(block_buffer);
 931
 932         return ret;
 933 }
 934
 935 int ext4fs_filename_unlink(char *filename)
 936 {
 937         int blk_idx;
 938         long int blknr = -1;
 939         int inodeno = -1;
 940         uint32_t directory_blocks;
 941
 942         directory_blocks = le32_to_cpu(g_parent_inode->size) >>
 943                 LOG2_BLOCK_SIZE(ext4fs_root);
 944
 945         /* read the block no allocated to a file */
 946         for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
 947                 blknr = read_allocated_block(g_parent_inode, blk_idx, NULL);
 948                 if (blknr <= 0)
 949                         break;
 950                 inodeno = unlink_filename(filename, blknr);
 951                 if (inodeno != -1)
 952                         return inodeno;
 953         }
 954
 955         return -1;
 956 }
 957
 958 uint32_t ext4fs_get_new_blk_no(void)
 959 {
 960         short i;
 961         short status;
 962         int remainder;
 963         unsigned int bg_idx;
 964         static int prev_bg_bitmap_index = -1;
 965         unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 966         struct ext_filesystem *fs = get_fs();
 967         char *journal_buffer = zalloc(fs->blksz);
 968         char *zero_buffer = zalloc(fs->blksz);
 969         if (!journal_buffer || !zero_buffer)
 970                 goto fail;
 971
 972         if (fs->first_pass_bbmap == 0) {
 973                 for (i = 0; i < fs->no_blkgrp; i++) {
 974                         struct ext2_block_group *bgd = NULL;
 975                         bgd = ext4fs_get_group_descriptor(fs, i);
 976                         if (ext4fs_bg_get_free_blocks(bgd, fs)) {
 977                                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
 978                                 uint64_t b_bitmap_blk =
 979                                         ext4fs_bg_get_block_id(bgd, fs);
 980                                 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
 981                                         memcpy(fs->blk_bmaps[i], zero_buffer,
 982                                                fs->blksz);
 983                                         put_ext4(b_bitmap_blk * fs->blksz,
 984                                                  fs->blk_bmaps[i], fs->blksz);
 985                                         bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
 986                                         ext4fs_bg_set_flags(bgd, bg_flags);
 987                                 }
 988                                 fs->curr_blkno =
 989                                     _get_new_blk_no(fs->blk_bmaps[i]);
 990                                 if (fs->curr_blkno == -1)
 991                                         /* block bitmap is completely filled */
 992                                         continue;
 993                                 fs->curr_blkno = fs->curr_blkno +
 994                                                 (i * fs->blksz * 8);
 995                                 fs->first_pass_bbmap++;
 996                                 ext4fs_bg_free_blocks_dec(bgd, fs);
 997                                 ext4fs_sb_free_blocks_dec(fs->sb);
 998                                 status = ext4fs_devread(b_bitmap_blk *
 999                                                         fs->sect_perblk,
1000                                                         0, fs->blksz,
1001                                                         journal_buffer);
1002                                 if (status == 0)
1003                                         goto fail;
1004                                 if (ext4fs_log_journal(journal_buffer,
1005                                                        b_bitmap_blk))
1006                                         goto fail;
1007                                 goto success;
1008                         } else {
1009                                 debug("no space left on block group %d\n", i);
1010                         }
1011                 }
1012
1013                 goto fail;
1014         } else {
1015                 fs->curr_blkno++;
1016 restart:
1017                 /* get the blockbitmap index respective to blockno */
1018                 bg_idx = fs->curr_blkno / blk_per_grp;
1019                 if (fs->blksz == 1024) {
1020                         remainder = fs->curr_blkno % blk_per_grp;
1021                         if (!remainder)
1022                                 bg_idx--;
1023                 }
1024
1025                 /*
1026                  * To skip completely filled block group bitmaps
1027                  * Optimize the block allocation
1028                  */
1029                 if (bg_idx >= fs->no_blkgrp)
1030                         goto fail;
1031
1032                 struct ext2_block_group *bgd = NULL;
1033                 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
1034                 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) {
1035                         debug("block group %u is full. Skipping\n", bg_idx);
1036                         fs->curr_blkno = (bg_idx + 1) * blk_per_grp;
1037                         if (fs->blksz == 1024)
1038                                 fs->curr_blkno += 1;
1039                         goto restart;
1040                 }
1041
1042                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1043                 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
1044                 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
1045                         memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
1046                         put_ext4(b_bitmap_blk * fs->blksz,
1047                                  zero_buffer, fs->blksz);
1048                         bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
1049                         ext4fs_bg_set_flags(bgd, bg_flags);
1050                 }
1051
1052                 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
1053                                    bg_idx) != 0) {
1054                         debug("going for restart for the block no %ld %u\n",
1055                               fs->curr_blkno, bg_idx);
1056                         fs->curr_blkno++;
1057                         goto restart;
1058                 }
1059
1060                 /* journal backup */
1061                 if (prev_bg_bitmap_index != bg_idx) {
1062                         status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
1063                                                 0, fs->blksz, journal_buffer);
1064                         if (status == 0)
1065                                 goto fail;
1066                         if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
1067                                 goto fail;
1068
1069                         prev_bg_bitmap_index = bg_idx;
1070                 }
1071                 ext4fs_bg_free_blocks_dec(bgd, fs);
1072                 ext4fs_sb_free_blocks_dec(fs->sb);
1073                 goto success;
1074         }
1075 success:
1076         free(journal_buffer);
1077         free(zero_buffer);
1078
1079         return fs->curr_blkno;
1080 fail:
1081         free(journal_buffer);
1082         free(zero_buffer);
1083
1084         return -1;
1085 }
1086
1087 int ext4fs_get_new_inode_no(void)
1088 {
1089         short i;
1090         short status;
1091         unsigned int ibmap_idx;
1092         static int prev_inode_bitmap_index = -1;
1093         unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
1094         struct ext_filesystem *fs = get_fs();
1095         char *journal_buffer = zalloc(fs->blksz);
1096         char *zero_buffer = zalloc(fs->blksz);
1097         if (!journal_buffer || !zero_buffer)
1098                 goto fail;
1099         int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) &
1100                 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0;
1101
1102         if (fs->first_pass_ibmap == 0) {
1103                 for (i = 0; i < fs->no_blkgrp; i++) {
1104                         uint32_t free_inodes;
1105                         struct ext2_block_group *bgd = NULL;
1106                         bgd = ext4fs_get_group_descriptor(fs, i);
1107                         free_inodes = ext4fs_bg_get_free_inodes(bgd, fs);
1108                         if (free_inodes) {
1109                                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1110                                 uint64_t i_bitmap_blk =
1111                                         ext4fs_bg_get_inode_id(bgd, fs);
1112                                 if (has_gdt_chksum)
1113                                         bgd->bg_itable_unused = free_inodes;
1114                                 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1115                                         put_ext4(i_bitmap_blk * fs->blksz,
1116                                                  zero_buffer, fs->blksz);
1117                                         bg_flags &= ~EXT4_BG_INODE_UNINIT;
1118                                         ext4fs_bg_set_flags(bgd, bg_flags);
1119                                         memcpy(fs->inode_bmaps[i],
1120                                                zero_buffer, fs->blksz);
1121                                 }
1122                                 fs->curr_inode_no =
1123                                     _get_new_inode_no(fs->inode_bmaps[i]);
1124                                 if (fs->curr_inode_no == -1)
1125                                         /* inode bitmap is completely filled */
1126                                         continue;
1127                                 fs->curr_inode_no = fs->curr_inode_no +
1128                                                         (i * inodes_per_grp);
1129                                 fs->first_pass_ibmap++;
1130                                 ext4fs_bg_free_inodes_dec(bgd, fs);
1131                                 if (has_gdt_chksum)
1132                                         ext4fs_bg_itable_unused_dec(bgd, fs);
1133                                 ext4fs_sb_free_inodes_dec(fs->sb);
1134                                 status = ext4fs_devread(i_bitmap_blk *
1135                                                         fs->sect_perblk,
1136                                                         0, fs->blksz,
1137                                                         journal_buffer);
1138                                 if (status == 0)
1139                                         goto fail;
1140                                 if (ext4fs_log_journal(journal_buffer,
1141                                                        i_bitmap_blk))
1142                                         goto fail;
1143                                 goto success;
1144                         } else
1145                                 debug("no inode left on block group %d\n", i);
1146                 }
1147                 goto fail;
1148         } else {
1149 restart:
1150                 fs->curr_inode_no++;
1151                 /* get the blockbitmap index respective to blockno */
1152                 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1153                 struct ext2_block_group *bgd =
1154                         ext4fs_get_group_descriptor(fs, ibmap_idx);
1155                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1156                 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
1157
1158                 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1159                         put_ext4(i_bitmap_blk * fs->blksz,
1160                                  zero_buffer, fs->blksz);
1161                         bg_flags &= ~EXT4_BG_INODE_UNINIT;
1162                         ext4fs_bg_set_flags(bgd, bg_flags);
1163                         memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1164                                 fs->blksz);
1165                 }
1166
1167                 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1168                                           fs->inode_bmaps[ibmap_idx],
1169                                           ibmap_idx) != 0) {
1170                         debug("going for restart for the block no %d %u\n",
1171                               fs->curr_inode_no, ibmap_idx);
1172                         goto restart;
1173                 }
1174
1175                 /* journal backup */
1176                 if (prev_inode_bitmap_index != ibmap_idx) {
1177                         status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk,
1178                                                 0, fs->blksz, journal_buffer);
1179                         if (status == 0)
1180                                 goto fail;
1181                         if (ext4fs_log_journal(journal_buffer,
1182                                                 le32_to_cpu(bgd->inode_id)))
1183                                 goto fail;
1184                         prev_inode_bitmap_index = ibmap_idx;
1185                 }
1186                 ext4fs_bg_free_inodes_dec(bgd, fs);
1187                 if (has_gdt_chksum)
1188                         bgd->bg_itable_unused = bgd->free_inodes;
1189                 ext4fs_sb_free_inodes_dec(fs->sb);
1190                 goto success;
1191         }
1192
1193 success:
1194         free(journal_buffer);
1195         free(zero_buffer);
1196
1197         return fs->curr_inode_no;
1198 fail:
1199         free(journal_buffer);
1200         free(zero_buffer);
1201
1202         return -1;
1203
1204 }
1205
1206
1207 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1208                                         unsigned int *total_remaining_blocks,
1209                                         unsigned int *no_blks_reqd)
1210 {
1211         short i;
1212         short status;
1213         long int actual_block_no;
1214         long int si_blockno;
1215         /* si :single indirect */
1216         __le32 *si_buffer = NULL;
1217         __le32 *si_start_addr = NULL;
1218         struct ext_filesystem *fs = get_fs();
1219
1220         if (*total_remaining_blocks != 0) {
1221                 si_buffer = zalloc(fs->blksz);
1222                 if (!si_buffer) {
1223                         printf("No Memory\n");
1224                         return;
1225                 }
1226                 si_start_addr = si_buffer;
1227                 si_blockno = ext4fs_get_new_blk_no();
1228                 if (si_blockno == -1) {
1229                         printf("no block left to assign\n");
1230                         goto fail;
1231                 }
1232                 (*no_blks_reqd)++;
1233                 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1234
1235                 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1236                                         0, fs->blksz, (char *)si_buffer);
1237                 memset(si_buffer, '\0', fs->blksz);
1238                 if (status == 0)
1239                         goto fail;
1240
1241                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1242                         actual_block_no = ext4fs_get_new_blk_no();
1243                         if (actual_block_no == -1) {
1244                                 printf("no block left to assign\n");
1245                                 goto fail;
1246                         }
1247                         *si_buffer = cpu_to_le32(actual_block_no);
1248                         debug("SIAB %u: %u\n", *si_buffer,
1249                                 *total_remaining_blocks);
1250
1251                         si_buffer++;
1252                         (*total_remaining_blocks)--;
1253                         if (*total_remaining_blocks == 0)
1254                                 break;
1255                 }
1256
1257                 /* write the block to disk */
1258                 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1259                          si_start_addr, fs->blksz);
1260                 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1261         }
1262 fail:
1263         free(si_start_addr);
1264 }
1265
1266 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1267                                         unsigned int *total_remaining_blocks,
1268                                         unsigned int *no_blks_reqd)
1269 {
1270         short i;
1271         short j;
1272         short status;
1273         long int actual_block_no;
1274         /* di:double indirect */
1275         long int di_blockno_parent;
1276         long int di_blockno_child;
1277         __le32 *di_parent_buffer = NULL;
1278         __le32 *di_child_buff = NULL;
1279         __le32 *di_block_start_addr = NULL;
1280         __le32 *di_child_buff_start = NULL;
1281         struct ext_filesystem *fs = get_fs();
1282
1283         if (*total_remaining_blocks != 0) {
1284                 /* double indirect parent block connecting to inode */
1285                 di_blockno_parent = ext4fs_get_new_blk_no();
1286                 if (di_blockno_parent == -1) {
1287                         printf("no block left to assign\n");
1288                         goto fail;
1289                 }
1290                 di_parent_buffer = zalloc(fs->blksz);
1291                 if (!di_parent_buffer)
1292                         goto fail;
1293
1294                 di_block_start_addr = di_parent_buffer;
1295                 (*no_blks_reqd)++;
1296                 debug("DIPB %ld: %u\n", di_blockno_parent,
1297                       *total_remaining_blocks);
1298
1299                 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1300                                         fs->sect_perblk, 0,
1301                                         fs->blksz, (char *)di_parent_buffer);
1302
1303                 if (!status) {
1304                         printf("%s: Device read error!\n", __func__);
1305                         goto fail;
1306                 }
1307                 memset(di_parent_buffer, '\0', fs->blksz);
1308
1309                 /*
1310                  * start:for each double indirect parent
1311                  * block create one more block
1312                  */
1313                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1314                         di_blockno_child = ext4fs_get_new_blk_no();
1315                         if (di_blockno_child == -1) {
1316                                 printf("no block left to assign\n");
1317                                 goto fail;
1318                         }
1319                         di_child_buff = zalloc(fs->blksz);
1320                         if (!di_child_buff)
1321                                 goto fail;
1322
1323                         di_child_buff_start = di_child_buff;
1324                         *di_parent_buffer = cpu_to_le32(di_blockno_child);
1325                         di_parent_buffer++;
1326                         (*no_blks_reqd)++;
1327                         debug("DICB %ld: %u\n", di_blockno_child,
1328                               *total_remaining_blocks);
1329
1330                         status = ext4fs_devread((lbaint_t)di_blockno_child *
1331                                                 fs->sect_perblk, 0,
1332                                                 fs->blksz,
1333                                                 (char *)di_child_buff);
1334
1335                         if (!status) {
1336                                 printf("%s: Device read error!\n", __func__);
1337                                 goto fail;
1338                         }
1339                         memset(di_child_buff, '\0', fs->blksz);
1340                         /* filling of actual datablocks for each child */
1341                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1342                                 actual_block_no = ext4fs_get_new_blk_no();
1343                                 if (actual_block_no == -1) {
1344                                         printf("no block left to assign\n");
1345                                         goto fail;
1346                                 }
1347                                 *di_child_buff = cpu_to_le32(actual_block_no);
1348                                 debug("DIAB %ld: %u\n", actual_block_no,
1349                                       *total_remaining_blocks);
1350
1351                                 di_child_buff++;
1352                                 (*total_remaining_blocks)--;
1353                                 if (*total_remaining_blocks == 0)
1354                                         break;
1355                         }
1356                         /* write the block  table */
1357                         put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1358                                  di_child_buff_start, fs->blksz);
1359                         free(di_child_buff_start);
1360                         di_child_buff_start = NULL;
1361
1362                         if (*total_remaining_blocks == 0)
1363                                 break;
1364                 }
1365                 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1366                          di_block_start_addr, fs->blksz);
1367                 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1368         }
1369 fail:
1370         free(di_block_start_addr);
1371 }
1372
1373 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1374                                         unsigned int *total_remaining_blocks,
1375                                         unsigned int *no_blks_reqd)
1376 {
1377         short i;
1378         short j;
1379         short k;
1380         long int actual_block_no;
1381         /* ti: Triple Indirect */
1382         long int ti_gp_blockno;
1383         long int ti_parent_blockno;
1384         long int ti_child_blockno;
1385         __le32 *ti_gp_buff = NULL;
1386         __le32 *ti_parent_buff = NULL;
1387         __le32 *ti_child_buff = NULL;
1388         __le32 *ti_gp_buff_start_addr = NULL;
1389         __le32 *ti_pbuff_start_addr = NULL;
1390         __le32 *ti_cbuff_start_addr = NULL;
1391         struct ext_filesystem *fs = get_fs();
1392         if (*total_remaining_blocks != 0) {
1393                 /* triple indirect grand parent block connecting to inode */
1394                 ti_gp_blockno = ext4fs_get_new_blk_no();
1395                 if (ti_gp_blockno == -1) {
1396                         printf("no block left to assign\n");
1397                         return;
1398                 }
1399                 ti_gp_buff = zalloc(fs->blksz);
1400                 if (!ti_gp_buff)
1401                         return;
1402
1403                 ti_gp_buff_start_addr = ti_gp_buff;
1404                 (*no_blks_reqd)++;
1405                 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1406                       *total_remaining_blocks);
1407
1408                 /* for each 4 byte grand parent entry create one more block */
1409                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1410                         ti_parent_blockno = ext4fs_get_new_blk_no();
1411                         if (ti_parent_blockno == -1) {
1412                                 printf("no block left to assign\n");
1413                                 goto fail;
1414                         }
1415                         ti_parent_buff = zalloc(fs->blksz);
1416                         if (!ti_parent_buff)
1417                                 goto fail;
1418
1419                         ti_pbuff_start_addr = ti_parent_buff;
1420                         *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1421                         ti_gp_buff++;
1422                         (*no_blks_reqd)++;
1423                         debug("TIPB %ld: %u\n", ti_parent_blockno,
1424                               *total_remaining_blocks);
1425
1426                         /* for each 4 byte entry parent create one more block */
1427                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1428                                 ti_child_blockno = ext4fs_get_new_blk_no();
1429                                 if (ti_child_blockno == -1) {
1430                                         printf("no block left assign\n");
1431                                         goto fail1;
1432                                 }
1433                                 ti_child_buff = zalloc(fs->blksz);
1434                                 if (!ti_child_buff)
1435                                         goto fail1;
1436
1437                                 ti_cbuff_start_addr = ti_child_buff;
1438                                 *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1439                                 ti_parent_buff++;
1440                                 (*no_blks_reqd)++;
1441                                 debug("TICB %ld: %u\n", ti_parent_blockno,
1442                                       *total_remaining_blocks);
1443
1444                                 /* fill actual datablocks for each child */
1445                                 for (k = 0; k < (fs->blksz / sizeof(int));
1446                                         k++) {
1447                                         actual_block_no =
1448                                             ext4fs_get_new_blk_no();
1449                                         if (actual_block_no == -1) {
1450                                                 printf("no block left\n");
1451                                                 free(ti_cbuff_start_addr);
1452                                                 goto fail1;
1453                                         }
1454                                         *ti_child_buff = cpu_to_le32(actual_block_no);
1455                                         debug("TIAB %ld: %u\n", actual_block_no,
1456                                               *total_remaining_blocks);
1457
1458                                         ti_child_buff++;
1459                                         (*total_remaining_blocks)--;
1460                                         if (*total_remaining_blocks == 0)
1461                                                 break;
1462                                 }
1463                                 /* write the child block */
1464                                 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1465                                                       (uint64_t)fs->blksz)),
1466                                          ti_cbuff_start_addr, fs->blksz);
1467                                 free(ti_cbuff_start_addr);
1468
1469                                 if (*total_remaining_blocks == 0)
1470                                         break;
1471                         }
1472                         /* write the parent block */
1473                         put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1474                                  ti_pbuff_start_addr, fs->blksz);
1475                         free(ti_pbuff_start_addr);
1476
1477                         if (*total_remaining_blocks == 0)
1478                                 break;
1479                 }
1480                 /* write the grand parent block */
1481                 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1482                          ti_gp_buff_start_addr, fs->blksz);
1483                 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1484                 free(ti_gp_buff_start_addr);
1485                 return;
1486         }
1487 fail1:
1488         free(ti_pbuff_start_addr);
1489 fail:
1490         free(ti_gp_buff_start_addr);
1491 }
1492
1493 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1494                                 unsigned int total_remaining_blocks,
1495                                 unsigned int *total_no_of_block)
1496 {
1497         short i;
1498         long int direct_blockno;
1499         unsigned int no_blks_reqd = 0;
1500
1501         /* allocation of direct blocks */
1502         for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1503                 direct_blockno = ext4fs_get_new_blk_no();
1504                 if (direct_blockno == -1) {
1505                         printf("no block left to assign\n");
1506                         return;
1507                 }
1508                 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1509                 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1510
1511                 total_remaining_blocks--;
1512         }
1513
1514         alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1515                                     &no_blks_reqd);
1516         alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1517                                     &no_blks_reqd);
1518         alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1519                                     &no_blks_reqd);
1520         *total_no_of_block += no_blks_reqd;
1521 }
1522
1523 #endif
1524
1525 static struct ext4_extent_header *ext4fs_get_extent_block
1526         (struct ext2_data *data, struct ext_block_cache *cache,
1527                 struct ext4_extent_header *ext_block,
1528                 uint32_t fileblock, int log2_blksz)
1529 {
1530         struct ext4_extent_idx *index;
1531         unsigned long long block;
1532         int blksz = EXT2_BLOCK_SIZE(data);
1533         int i;
1534
1535         while (1) {
1536                 index = (struct ext4_extent_idx *)(ext_block + 1);
1537
1538                 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1539                         return NULL;
1540
1541                 if (ext_block->eh_depth == 0)
1542                         return ext_block;
1543                 i = -1;
1544                 do {
1545                         i++;
1546                         if (i >= le16_to_cpu(ext_block->eh_entries))
1547                                 break;
1548                 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1549
1550                 /*
1551                  * If first logical block number is higher than requested fileblock,
1552                  * it is a sparse file. This is handled on upper layer.
1553                  */
1554                 if (i > 0)
1555                         i--;
1556
1557                 block = le16_to_cpu(index[i].ei_leaf_hi);
1558                 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1559                 block <<= log2_blksz;
1560                 if (!ext_cache_read(cache, (lbaint_t)block, blksz))
1561                         return NULL;
1562                 ext_block = (struct ext4_extent_header *)cache->buf;
1563         }
1564 }
1565
1566 static int ext4fs_blockgroup
1567         (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1568 {
1569         long int blkno;
1570         unsigned int blkoff, desc_per_blk;
1571         int log2blksz = get_fs()->dev_desc->log2blksz;
1572         int desc_size = get_fs()->gdsize;
1573
1574         if (desc_size == 0)
1575                 return 0;
1576         desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size;
1577
1578         if (desc_per_blk == 0)
1579                 return 0;
1580         blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1581                         group / desc_per_blk;
1582         blkoff = (group % desc_per_blk) * desc_size;
1583
1584         debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1585               group, blkno, blkoff);
1586
1587         return ext4fs_devread((lbaint_t)blkno <<
1588                               (LOG2_BLOCK_SIZE(data) - log2blksz),
1589                               blkoff, desc_size, (char *)blkgrp);
1590 }
1591
1592 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1593 {
1594         struct ext2_block_group *blkgrp;
1595         struct ext2_sblock *sblock = &data->sblock;
1596         struct ext_filesystem *fs = get_fs();
1597         int log2blksz = get_fs()->dev_desc->log2blksz;
1598         int inodes_per_block, status;
1599         long int blkno;
1600         unsigned int blkoff;
1601
1602         /* Allocate blkgrp based on gdsize (for 64-bit support). */
1603         blkgrp = zalloc(get_fs()->gdsize);
1604         if (!blkgrp)
1605                 return 0;
1606
1607         /* It is easier to calculate if the first inode is 0. */
1608         ino--;
1609         if ( le32_to_cpu(sblock->inodes_per_group) == 0 || fs->inodesz == 0) {
1610                 free(blkgrp);
1611                 return 0;
1612         }
1613         status = ext4fs_blockgroup(data, ino / le32_to_cpu
1614                                    (sblock->inodes_per_group), blkgrp);
1615         if (status == 0) {
1616                 free(blkgrp);
1617                 return 0;
1618         }
1619
1620         inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1621         if ( inodes_per_block == 0 ) {
1622                 free(blkgrp);
1623                 return 0;
1624         }
1625         blkno = ext4fs_bg_get_inode_table_id(blkgrp, fs) +
1626             (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1627         blkoff = (ino % inodes_per_block) * fs->inodesz;
1628
1629         /* Free blkgrp as it is no longer required. */
1630         free(blkgrp);
1631
1632         /* Read the inode. */
1633         status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1634                                 log2blksz), blkoff,
1635                                 sizeof(struct ext2_inode), (char *)inode);
1636         if (status == 0)
1637                 return 0;
1638
1639         return 1;
1640 }
1641
1642 long int read_allocated_block(struct ext2_inode *inode, int fileblock,
1643                               struct ext_block_cache *cache)
1644 {
1645         long int blknr;
1646         int blksz;
1647         int log2_blksz;
1648         int status;
1649         long int rblock;
1650         long int perblock_parent;
1651         long int perblock_child;
1652         unsigned long long start;
1653         /* get the blocksize of the filesystem */
1654         blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1655         log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1656                 - get_fs()->dev_desc->log2blksz;
1657
1658         if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1659                 long int startblock, endblock;
1660                 struct ext_block_cache *c, cd;
1661                 struct ext4_extent_header *ext_block;
1662                 struct ext4_extent *extent;
1663                 int i;
1664
1665                 if (cache) {
1666                         c = cache;
1667                 } else {
1668                         c = &cd;
1669                         ext_cache_init(c);
1670                 }
1671                 ext_block =
1672                         ext4fs_get_extent_block(ext4fs_root, c,
1673                                                 (struct ext4_extent_header *)
1674                                                 inode->b.blocks.dir_blocks,
1675                                                 fileblock, log2_blksz);
1676                 if (!ext_block) {
1677                         printf("invalid extent block\n");
1678                         if (!cache)
1679                                 ext_cache_fini(c);
1680                         return -EINVAL;
1681                 }
1682
1683                 extent = (struct ext4_extent *)(ext_block + 1);
1684
1685                 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) {
1686                         startblock = le32_to_cpu(extent[i].ee_block);
1687                         endblock = startblock + le16_to_cpu(extent[i].ee_len);
1688
1689                         if (startblock > fileblock) {
1690                                 /* Sparse file */
1691                                 if (!cache)
1692                                         ext_cache_fini(c);
1693                                 return 0;
1694
1695                         } else if (fileblock < endblock) {
1696                                 start = le16_to_cpu(extent[i].ee_start_hi);
1697                                 start = (start << 32) +
1698                                         le32_to_cpu(extent[i].ee_start_lo);
1699                                 if (!cache)
1700                                         ext_cache_fini(c);
1701                                 return (fileblock - startblock) + start;
1702                         }
1703                 }
1704
1705                 if (!cache)
1706                         ext_cache_fini(c);
1707                 return 0;
1708         }
1709
1710         /* Direct blocks. */
1711         if (fileblock < INDIRECT_BLOCKS)
1712                 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1713
1714         /* Indirect. */
1715         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1716                 if (ext4fs_indir1_block == NULL) {
1717                         ext4fs_indir1_block = zalloc(blksz);
1718                         if (ext4fs_indir1_block == NULL) {
1719                                 printf("** SI ext2fs read block (indir 1)"
1720                                         "malloc failed. **\n");
1721                                 return -1;
1722                         }
1723                         ext4fs_indir1_size = blksz;
1724                         ext4fs_indir1_blkno = -1;
1725                 }
1726                 if (blksz != ext4fs_indir1_size) {
1727                         free(ext4fs_indir1_block);
1728                         ext4fs_indir1_block = NULL;
1729                         ext4fs_indir1_size = 0;
1730                         ext4fs_indir1_blkno = -1;
1731                         ext4fs_indir1_block = zalloc(blksz);
1732                         if (ext4fs_indir1_block == NULL) {
1733                                 printf("** SI ext2fs read block (indir 1):"
1734                                         "malloc failed. **\n");
1735                                 return -1;
1736                         }
1737                         ext4fs_indir1_size = blksz;
1738                 }
1739                 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1740                      log2_blksz) != ext4fs_indir1_blkno) {
1741                         status =
1742                             ext4fs_devread((lbaint_t)le32_to_cpu
1743                                            (inode->b.blocks.
1744                                             indir_block) << log2_blksz, 0,
1745                                            blksz, (char *)ext4fs_indir1_block);
1746                         if (status == 0) {
1747                                 printf("** SI ext2fs read block (indir 1)"
1748                                         "failed. **\n");
1749                                 return -1;
1750                         }
1751                         ext4fs_indir1_blkno =
1752                                 le32_to_cpu(inode->b.blocks.
1753                                                indir_block) << log2_blksz;
1754                 }
1755                 blknr = le32_to_cpu(ext4fs_indir1_block
1756                                       [fileblock - INDIRECT_BLOCKS]);
1757         }
1758         /* Double indirect. */
1759         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1760                                         (blksz / 4 + 1)))) {
1761
1762                 long int perblock = blksz / 4;
1763                 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1764
1765                 if (ext4fs_indir1_block == NULL) {
1766                         ext4fs_indir1_block = zalloc(blksz);
1767                         if (ext4fs_indir1_block == NULL) {
1768                                 printf("** DI ext2fs read block (indir 2 1)"
1769                                         "malloc failed. **\n");
1770                                 return -1;
1771                         }
1772                         ext4fs_indir1_size = blksz;
1773                         ext4fs_indir1_blkno = -1;
1774                 }
1775                 if (blksz != ext4fs_indir1_size) {
1776                         free(ext4fs_indir1_block);
1777                         ext4fs_indir1_block = NULL;
1778                         ext4fs_indir1_size = 0;
1779                         ext4fs_indir1_blkno = -1;
1780                         ext4fs_indir1_block = zalloc(blksz);
1781                         if (ext4fs_indir1_block == NULL) {
1782                                 printf("** DI ext2fs read block (indir 2 1)"
1783                                         "malloc failed. **\n");
1784                                 return -1;
1785                         }
1786                         ext4fs_indir1_size = blksz;
1787                 }
1788                 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1789                      log2_blksz) != ext4fs_indir1_blkno) {
1790                         status =
1791                             ext4fs_devread((lbaint_t)le32_to_cpu
1792                                            (inode->b.blocks.
1793                                             double_indir_block) << log2_blksz,
1794                                            0, blksz,
1795                                            (char *)ext4fs_indir1_block);
1796                         if (status == 0) {
1797                                 printf("** DI ext2fs read block (indir 2 1)"
1798                                         "failed. **\n");
1799                                 return -1;
1800                         }
1801                         ext4fs_indir1_blkno =
1802                             le32_to_cpu(inode->b.blocks.double_indir_block) <<
1803                             log2_blksz;
1804                 }
1805
1806                 if (ext4fs_indir2_block == NULL) {
1807                         ext4fs_indir2_block = zalloc(blksz);
1808                         if (ext4fs_indir2_block == NULL) {
1809                                 printf("** DI ext2fs read block (indir 2 2)"
1810                                         "malloc failed. **\n");
1811                                 return -1;
1812                         }
1813                         ext4fs_indir2_size = blksz;
1814                         ext4fs_indir2_blkno = -1;
1815                 }
1816                 if (blksz != ext4fs_indir2_size) {
1817                         free(ext4fs_indir2_block);
1818                         ext4fs_indir2_block = NULL;
1819                         ext4fs_indir2_size = 0;
1820                         ext4fs_indir2_blkno = -1;
1821                         ext4fs_indir2_block = zalloc(blksz);
1822                         if (ext4fs_indir2_block == NULL) {
1823                                 printf("** DI ext2fs read block (indir 2 2)"
1824                                         "malloc failed. **\n");
1825                                 return -1;
1826                         }
1827                         ext4fs_indir2_size = blksz;
1828                 }
1829                 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1830                      log2_blksz) != ext4fs_indir2_blkno) {
1831                         status = ext4fs_devread((lbaint_t)le32_to_cpu
1832                                                 (ext4fs_indir1_block
1833                                                  [rblock /
1834                                                   perblock]) << log2_blksz, 0,
1835                                                 blksz,
1836                                                 (char *)ext4fs_indir2_block);
1837                         if (status == 0) {
1838                                 printf("** DI ext2fs read block (indir 2 2)"
1839                                         "failed. **\n");
1840                                 return -1;
1841                         }
1842                         ext4fs_indir2_blkno =
1843                             le32_to_cpu(ext4fs_indir1_block[rblock
1844                                                               /
1845                                                               perblock]) <<
1846                             log2_blksz;
1847                 }
1848                 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1849         }
1850         /* Tripple indirect. */
1851         else {
1852                 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1853                                       (blksz / 4 * blksz / 4));
1854                 perblock_child = blksz / 4;
1855                 perblock_parent = ((blksz / 4) * (blksz / 4));
1856
1857                 if (ext4fs_indir1_block == NULL) {
1858                         ext4fs_indir1_block = zalloc(blksz);
1859                         if (ext4fs_indir1_block == NULL) {
1860                                 printf("** TI ext2fs read block (indir 2 1)"
1861                                         "malloc failed. **\n");
1862                                 return -1;
1863                         }
1864                         ext4fs_indir1_size = blksz;
1865                         ext4fs_indir1_blkno = -1;
1866                 }
1867                 if (blksz != ext4fs_indir1_size) {
1868                         free(ext4fs_indir1_block);
1869                         ext4fs_indir1_block = NULL;
1870                         ext4fs_indir1_size = 0;
1871                         ext4fs_indir1_blkno = -1;
1872                         ext4fs_indir1_block = zalloc(blksz);
1873                         if (ext4fs_indir1_block == NULL) {
1874                                 printf("** TI ext2fs read block (indir 2 1)"
1875                                         "malloc failed. **\n");
1876                                 return -1;
1877                         }
1878                         ext4fs_indir1_size = blksz;
1879                 }
1880                 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1881                      log2_blksz) != ext4fs_indir1_blkno) {
1882                         status = ext4fs_devread
1883                             ((lbaint_t)
1884                              le32_to_cpu(inode->b.blocks.triple_indir_block)
1885                              << log2_blksz, 0, blksz,
1886                              (char *)ext4fs_indir1_block);
1887                         if (status == 0) {
1888                                 printf("** TI ext2fs read block (indir 2 1)"
1889                                         "failed. **\n");
1890                                 return -1;
1891                         }
1892                         ext4fs_indir1_blkno =
1893                             le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1894                             log2_blksz;
1895                 }
1896
1897                 if (ext4fs_indir2_block == NULL) {
1898                         ext4fs_indir2_block = zalloc(blksz);
1899                         if (ext4fs_indir2_block == NULL) {
1900                                 printf("** TI ext2fs read block (indir 2 2)"
1901                                         "malloc failed. **\n");
1902                                 return -1;
1903                         }
1904                         ext4fs_indir2_size = blksz;
1905                         ext4fs_indir2_blkno = -1;
1906                 }
1907                 if (blksz != ext4fs_indir2_size) {
1908                         free(ext4fs_indir2_block);
1909                         ext4fs_indir2_block = NULL;
1910                         ext4fs_indir2_size = 0;
1911                         ext4fs_indir2_blkno = -1;
1912                         ext4fs_indir2_block = zalloc(blksz);
1913                         if (ext4fs_indir2_block == NULL) {
1914                                 printf("** TI ext2fs read block (indir 2 2)"
1915                                         "malloc failed. **\n");
1916                                 return -1;
1917                         }
1918                         ext4fs_indir2_size = blksz;
1919                 }
1920                 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1921                                                        perblock_parent]) <<
1922                      log2_blksz)
1923                     != ext4fs_indir2_blkno) {
1924                         status = ext4fs_devread((lbaint_t)le32_to_cpu
1925                                                 (ext4fs_indir1_block
1926                                                  [rblock /
1927                                                   perblock_parent]) <<
1928                                                 log2_blksz, 0, blksz,
1929                                                 (char *)ext4fs_indir2_block);
1930                         if (status == 0) {
1931                                 printf("** TI ext2fs read block (indir 2 2)"
1932                                         "failed. **\n");
1933                                 return -1;
1934                         }
1935                         ext4fs_indir2_blkno =
1936                             le32_to_cpu(ext4fs_indir1_block[rblock /
1937                                                               perblock_parent])
1938                             << log2_blksz;
1939                 }
1940
1941                 if (ext4fs_indir3_block == NULL) {
1942                         ext4fs_indir3_block = zalloc(blksz);
1943                         if (ext4fs_indir3_block == NULL) {
1944                                 printf("** TI ext2fs read block (indir 2 2)"
1945                                         "malloc failed. **\n");
1946                                 return -1;
1947                         }
1948                         ext4fs_indir3_size = blksz;
1949                         ext4fs_indir3_blkno = -1;
1950                 }
1951                 if (blksz != ext4fs_indir3_size) {
1952                         free(ext4fs_indir3_block);
1953                         ext4fs_indir3_block = NULL;
1954                         ext4fs_indir3_size = 0;
1955                         ext4fs_indir3_blkno = -1;
1956                         ext4fs_indir3_block = zalloc(blksz);
1957                         if (ext4fs_indir3_block == NULL) {
1958                                 printf("** TI ext2fs read block (indir 2 2)"
1959                                         "malloc failed. **\n");
1960                                 return -1;
1961                         }
1962                         ext4fs_indir3_size = blksz;
1963                 }
1964                 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1965                                                        /
1966                                                        perblock_child]) <<
1967                      log2_blksz) != ext4fs_indir3_blkno) {
1968                         status =
1969                             ext4fs_devread((lbaint_t)le32_to_cpu
1970                                            (ext4fs_indir2_block
1971                                             [(rblock / perblock_child)
1972                                              % (blksz / 4)]) << log2_blksz, 0,
1973                                            blksz, (char *)ext4fs_indir3_block);
1974                         if (status == 0) {
1975                                 printf("** TI ext2fs read block (indir 2 2)"
1976                                        "failed. **\n");
1977                                 return -1;
1978                         }
1979                         ext4fs_indir3_blkno =
1980                             le32_to_cpu(ext4fs_indir2_block[(rblock /
1981                                                                perblock_child) %
1982                                                               (blksz /
1983                                                                4)]) <<
1984                             log2_blksz;
1985                 }
1986
1987                 blknr = le32_to_cpu(ext4fs_indir3_block
1988                                       [rblock % perblock_child]);
1989         }
1990         debug("read_allocated_block %ld\n", blknr);
1991
1992         return blknr;
1993 }
1994
1995 /**
1996  * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1997  *                          global pointers
1998  *
1999  * This function assures that for a file with the same name but different size
2000  * the sequential store on the ext4 filesystem will be correct.
2001  *
2002  * In this function the global data, responsible for internal representation
2003  * of the ext4 data are initialized to the reset state. Without this, during
2004  * replacement of the smaller file with the bigger truncation of new file was
2005  * performed.
2006  */
2007 void ext4fs_reinit_global(void)
2008 {
2009         if (ext4fs_indir1_block != NULL) {
2010                 free(ext4fs_indir1_block);
2011                 ext4fs_indir1_block = NULL;
2012                 ext4fs_indir1_size = 0;
2013                 ext4fs_indir1_blkno = -1;
2014         }
2015         if (ext4fs_indir2_block != NULL) {
2016                 free(ext4fs_indir2_block);
2017                 ext4fs_indir2_block = NULL;
2018                 ext4fs_indir2_size = 0;
2019                 ext4fs_indir2_blkno = -1;
2020         }
2021         if (ext4fs_indir3_block != NULL) {
2022                 free(ext4fs_indir3_block);
2023                 ext4fs_indir3_block = NULL;
2024                 ext4fs_indir3_size = 0;
2025                 ext4fs_indir3_blkno = -1;
2026         }
2027 }
2028 void ext4fs_close(void)
2029 {
2030         if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
2031                 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
2032                 ext4fs_file = NULL;
2033         }
2034         if (ext4fs_root != NULL) {
2035                 free(ext4fs_root);
2036                 ext4fs_root = NULL;
2037         }
2038
2039         ext4fs_reinit_global();
2040 }
2041
2042 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
2043                                 struct ext2fs_node **fnode, int *ftype)
2044 {
2045         unsigned int fpos = 0;
2046         int status;
2047         loff_t actread;
2048         struct ext2fs_node *diro = (struct ext2fs_node *) dir;
2049
2050 #ifdef DEBUG
2051         if (name != NULL)
2052                 printf("Iterate dir %s\n", name);
2053 #endif /* of DEBUG */
2054         if (!diro->inode_read) {
2055                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2056                 if (status == 0)
2057                         return 0;
2058         }
2059         /* Search the file.  */
2060         while (fpos < le32_to_cpu(diro->inode.size)) {
2061                 struct ext2_dirent dirent;
2062
2063                 status = ext4fs_read_file(diro, fpos,
2064                                            sizeof(struct ext2_dirent),
2065                                            (char *)&dirent, &actread);
2066                 if (status < 0)
2067                         return 0;
2068
2069                 if (dirent.direntlen == 0) {
2070                         printf("Failed to iterate over directory %s\n", name);
2071                         return 0;
2072                 }
2073
2074                 if (dirent.namelen != 0) {
2075                         char filename[dirent.namelen + 1];
2076                         struct ext2fs_node *fdiro;
2077                         int type = FILETYPE_UNKNOWN;
2078
2079                         status = ext4fs_read_file(diro,
2080                                                   fpos +
2081                                                   sizeof(struct ext2_dirent),
2082                                                   dirent.namelen, filename,
2083                                                   &actread);
2084                         if (status < 0)
2085                                 return 0;
2086
2087                         fdiro = zalloc(sizeof(struct ext2fs_node));
2088                         if (!fdiro)
2089                                 return 0;
2090
2091                         fdiro->data = diro->data;
2092                         fdiro->ino = le32_to_cpu(dirent.inode);
2093
2094                         filename[dirent.namelen] = '\0';
2095
2096                         if (dirent.filetype != FILETYPE_UNKNOWN) {
2097                                 fdiro->inode_read = 0;
2098
2099                                 if (dirent.filetype == FILETYPE_DIRECTORY)
2100                                         type = FILETYPE_DIRECTORY;
2101                                 else if (dirent.filetype == FILETYPE_SYMLINK)
2102                                         type = FILETYPE_SYMLINK;
2103                                 else if (dirent.filetype == FILETYPE_REG)
2104                                         type = FILETYPE_REG;
2105                         } else {
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                                 if ((le16_to_cpu(fdiro->inode.mode) &
2117                                      FILETYPE_INO_MASK) ==
2118                                     FILETYPE_INO_DIRECTORY) {
2119                                         type = FILETYPE_DIRECTORY;
2120                                 } else if ((le16_to_cpu(fdiro->inode.mode)
2121                                             & FILETYPE_INO_MASK) ==
2122                                            FILETYPE_INO_SYMLINK) {
2123                                         type = FILETYPE_SYMLINK;
2124                                 } else if ((le16_to_cpu(fdiro->inode.mode)
2125                                             & FILETYPE_INO_MASK) ==
2126                                            FILETYPE_INO_REG) {
2127                                         type = FILETYPE_REG;
2128                                 }
2129                         }
2130 #ifdef DEBUG
2131                         printf("iterate >%s<\n", filename);
2132 #endif /* of DEBUG */
2133                         if ((name != NULL) && (fnode != NULL)
2134                             && (ftype != NULL)) {
2135                                 if (strcmp(filename, name) == 0) {
2136                                         *ftype = type;
2137                                         *fnode = fdiro;
2138                                         return 1;
2139                                 }
2140                         } else {
2141                                 if (fdiro->inode_read == 0) {
2142                                         status = ext4fs_read_inode(diro->data,
2143                                                                  le32_to_cpu(
2144                                                                  dirent.inode),
2145                                                                  &fdiro->inode);
2146                                         if (status == 0) {
2147                                                 free(fdiro);
2148                                                 return 0;
2149                                         }
2150                                         fdiro->inode_read = 1;
2151                                 }
2152                                 switch (type) {
2153                                 case FILETYPE_DIRECTORY:
2154                                         printf("<DIR> ");
2155                                         break;
2156                                 case FILETYPE_SYMLINK:
2157                                         printf("<SYM> ");
2158                                         break;
2159                                 case FILETYPE_REG:
2160                                         printf("      ");
2161                                         break;
2162                                 default:
2163                                         printf("< ? > ");
2164                                         break;
2165                                 }
2166                                 printf("%10u %s\n",
2167                                        le32_to_cpu(fdiro->inode.size),
2168                                         filename);
2169                         }
2170                         free(fdiro);
2171                 }
2172                 fpos += le16_to_cpu(dirent.direntlen);
2173         }
2174         return 0;
2175 }
2176
2177 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2178 {
2179         char *symlink;
2180         struct ext2fs_node *diro = node;
2181         int status;
2182         loff_t actread;
2183
2184         if (!diro->inode_read) {
2185                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2186                 if (status == 0)
2187                         return NULL;
2188         }
2189         symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2190         if (!symlink)
2191                 return NULL;
2192
2193         if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2194                 strncpy(symlink, diro->inode.b.symlink,
2195                          le32_to_cpu(diro->inode.size));
2196         } else {
2197                 status = ext4fs_read_file(diro, 0,
2198                                            le32_to_cpu(diro->inode.size),
2199                                            symlink, &actread);
2200                 if ((status < 0) || (actread == 0)) {
2201                         free(symlink);
2202                         return NULL;
2203                 }
2204         }
2205         symlink[le32_to_cpu(diro->inode.size)] = '\0';
2206         return symlink;
2207 }
2208
2209 static int ext4fs_find_file1(const char *currpath,
2210                              struct ext2fs_node *currroot,
2211                              struct ext2fs_node **currfound, int *foundtype)
2212 {
2213         char fpath[strlen(currpath) + 1];
2214         char *name = fpath;
2215         char *next;
2216         int status;
2217         int type = FILETYPE_DIRECTORY;
2218         struct ext2fs_node *currnode = currroot;
2219         struct ext2fs_node *oldnode = currroot;
2220
2221         strncpy(fpath, currpath, strlen(currpath) + 1);
2222
2223         /* Remove all leading slashes. */
2224         while (*name == '/')
2225                 name++;
2226
2227         if (!*name) {
2228                 *currfound = currnode;
2229                 return 1;
2230         }
2231
2232         for (;;) {
2233                 int found;
2234
2235                 /* Extract the actual part from the pathname. */
2236                 next = strchr(name, '/');
2237                 if (next) {
2238                         /* Remove all leading slashes. */
2239                         while (*next == '/')
2240                                 *(next++) = '\0';
2241                 }
2242
2243                 if (type != FILETYPE_DIRECTORY) {
2244                         ext4fs_free_node(currnode, currroot);
2245                         return 0;
2246                 }
2247
2248                 oldnode = currnode;
2249
2250                 /* Iterate over the directory. */
2251                 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2252                 if (found == 0)
2253                         return 0;
2254
2255                 if (found == -1)
2256                         break;
2257
2258                 /* Read in the symlink and follow it. */
2259                 if (type == FILETYPE_SYMLINK) {
2260                         char *symlink;
2261
2262                         /* Test if the symlink does not loop. */
2263                         if (++symlinknest == 8) {
2264                                 ext4fs_free_node(currnode, currroot);
2265                                 ext4fs_free_node(oldnode, currroot);
2266                                 return 0;
2267                         }
2268
2269                         symlink = ext4fs_read_symlink(currnode);
2270                         ext4fs_free_node(currnode, currroot);
2271
2272                         if (!symlink) {
2273                                 ext4fs_free_node(oldnode, currroot);
2274                                 return 0;
2275                         }
2276
2277                         debug("Got symlink >%s<\n", symlink);
2278
2279                         if (symlink[0] == '/') {
2280                                 ext4fs_free_node(oldnode, currroot);
2281                                 oldnode = &ext4fs_root->diropen;
2282                         }
2283
2284                         /* Lookup the node the symlink points to. */
2285                         status = ext4fs_find_file1(symlink, oldnode,
2286                                                     &currnode, &type);
2287
2288                         free(symlink);
2289
2290                         if (status == 0) {
2291                                 ext4fs_free_node(oldnode, currroot);
2292                                 return 0;
2293                         }
2294                 }
2295
2296                 ext4fs_free_node(oldnode, currroot);
2297
2298                 /* Found the node! */
2299                 if (!next || *next == '\0') {
2300                         *currfound = currnode;
2301                         *foundtype = type;
2302                         return 1;
2303                 }
2304                 name = next;
2305         }
2306         return -1;
2307 }
2308
2309 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2310         struct ext2fs_node **foundnode, int expecttype)
2311 {
2312         int status;
2313         int foundtype = FILETYPE_DIRECTORY;
2314
2315         symlinknest = 0;
2316         if (!path)
2317                 return 0;
2318
2319         status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2320         if (status == 0)
2321                 return 0;
2322
2323         /* Check if the node that was found was of the expected type. */
2324         if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2325                 return 0;
2326         else if ((expecttype == FILETYPE_DIRECTORY)
2327                    && (foundtype != expecttype))
2328                 return 0;
2329
2330         return 1;
2331 }
2332
2333 int ext4fs_open(const char *filename, loff_t *len)
2334 {
2335         struct ext2fs_node *fdiro = NULL;
2336         int status;
2337
2338         if (ext4fs_root == NULL)
2339                 return -1;
2340
2341         ext4fs_file = NULL;
2342         status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2343                                   FILETYPE_REG);
2344         if (status == 0)
2345                 goto fail;
2346
2347         if (!fdiro->inode_read) {
2348                 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2349                                 &fdiro->inode);
2350                 if (status == 0)
2351                         goto fail;
2352         }
2353         *len = le32_to_cpu(fdiro->inode.size);
2354         ext4fs_file = fdiro;
2355
2356         return 0;
2357 fail:
2358         ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2359
2360         return -1;
2361 }
2362
2363 int ext4fs_mount(unsigned part_length)
2364 {
2365         struct ext2_data *data;
2366         int status;
2367         struct ext_filesystem *fs = get_fs();
2368         data = zalloc(SUPERBLOCK_SIZE);
2369         if (!data)
2370                 return 0;
2371
2372         /* Read the superblock. */
2373         status = ext4_read_superblock((char *)&data->sblock);
2374
2375         if (status == 0)
2376                 goto fail;
2377
2378         /* Make sure this is an ext2 filesystem. */
2379         if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2380                 goto fail_noerr;
2381
2382
2383         if (le32_to_cpu(data->sblock.revision_level) == 0) {
2384                 fs->inodesz = 128;
2385                 fs->gdsize = 32;
2386         } else {
2387                 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2388                       __le32_to_cpu(data->sblock.feature_compatibility),
2389                       __le32_to_cpu(data->sblock.feature_incompat),
2390                       __le32_to_cpu(data->sblock.feature_ro_compat));
2391
2392                 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2393                 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2394                         EXT4_FEATURE_INCOMPAT_64BIT ?
2395                         le16_to_cpu(data->sblock.descriptor_size) : 32;
2396         }
2397
2398         debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2399               le32_to_cpu(data->sblock.revision_level),
2400               fs->inodesz, fs->gdsize);
2401
2402         data->diropen.data = data;
2403         data->diropen.ino = 2;
2404         data->diropen.inode_read = 1;
2405         data->inode = &data->diropen.inode;
2406
2407         status = ext4fs_read_inode(data, 2, data->inode);
2408         if (status == 0)
2409                 goto fail;
2410
2411         ext4fs_root = data;
2412
2413         return 1;
2414 fail:
2415         printf("Failed to mount ext2 filesystem...\n");
2416 fail_noerr:
2417         free(data);
2418         ext4fs_root = NULL;
2419
2420         return 0;
2421 }