fs/ext4/ext4_common.c

   1 /*
   2  * (C) Copyright 2011 - 2012 Samsung Electronics
   3  * EXT4 filesystem implementation in Uboot by
   4  * Uma Shankar <uma.shankar@samsung.com>
   5  * Manjunatha C Achar <a.manjunatha@samsung.com>
   6  *
   7  * ext4ls and ext4load : Based on ext2 ls load support in Uboot.
   8  *
   9  * (C) Copyright 2004
  10  * esd gmbh <www.esd-electronics.com>
  11  * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
  12  *
  13  * based on code from grub2 fs/ext2.c and fs/fshelp.c by
  14  * GRUB  --  GRand Unified Bootloader
  15  * Copyright (C) 2003, 2004  Free Software Foundation, Inc.
  16  *
  17  * ext4write : Based on generic ext4 protocol.
  18  *
  19  * SPDX-License-Identifier:     GPL-2.0+
  20  */
  21
  22 #include <common.h>
  23 #include <ext_common.h>
  24 #include <ext4fs.h>
  25 #include <inttypes.h>
  26 #include <malloc.h>
  27 #include <memalign.h>
  28 #include <stddef.h>
  29 #include <linux/stat.h>
  30 #include <linux/time.h>
  31 #include <asm/byteorder.h>
  32 #include "ext4_common.h"
  33
  34 struct ext2_data *ext4fs_root;
  35 struct ext2fs_node *ext4fs_file;
  36 __le32 *ext4fs_indir1_block;
  37 int ext4fs_indir1_size;
  38 int ext4fs_indir1_blkno = -1;
  39 __le32 *ext4fs_indir2_block;
  40 int ext4fs_indir2_size;
  41 int ext4fs_indir2_blkno = -1;
  42
  43 __le32 *ext4fs_indir3_block;
  44 int ext4fs_indir3_size;
  45 int ext4fs_indir3_blkno = -1;
  46 struct ext2_inode *g_parent_inode;
  47 static int symlinknest;
  48
  49 #if defined(CONFIG_EXT4_WRITE)
  50 struct ext2_block_group *ext4fs_get_group_descriptor
  51         (const struct ext_filesystem *fs, uint32_t bg_idx)
  52 {
  53         return (struct ext2_block_group *)(fs->gdtable + (bg_idx * fs->gdsize));
  54 }
  55
  56 static inline void ext4fs_sb_free_inodes_dec(struct ext2_sblock *sb)
  57 {
  58         sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) - 1);
  59 }
  60
  61 static inline void ext4fs_sb_free_blocks_dec(struct ext2_sblock *sb)
  62 {
  63         uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
  64         free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
  65         free_blocks--;
  66
  67         sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
  68         sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
  69 }
  70
  71 static inline void ext4fs_bg_free_inodes_dec
  72         (struct ext2_block_group *bg, const struct ext_filesystem *fs)
  73 {
  74         uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
  75         if (fs->gdsize == 64)
  76                 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
  77         free_inodes--;
  78
  79         bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
  80         if (fs->gdsize == 64)
  81                 bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
  82 }
  83
  84 static inline void ext4fs_bg_free_blocks_dec
  85         (struct ext2_block_group *bg, const struct ext_filesystem *fs)
  86 {
  87         uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
  88         if (fs->gdsize == 64)
  89                 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
  90         free_blocks--;
  91
  92         bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
  93         if (fs->gdsize == 64)
  94                 bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
  95 }
  96
  97 static inline void ext4fs_bg_itable_unused_dec
  98         (struct ext2_block_group *bg, const struct ext_filesystem *fs)
  99 {
 100         uint32_t free_inodes = le16_to_cpu(bg->bg_itable_unused);
 101         if (fs->gdsize == 64)
 102                 free_inodes += le16_to_cpu(bg->bg_itable_unused_high) << 16;
 103         free_inodes--;
 104
 105         bg->bg_itable_unused = cpu_to_le16(free_inodes & 0xffff);
 106         if (fs->gdsize == 64)
 107                 bg->bg_itable_unused_high = cpu_to_le16(free_inodes >> 16);
 108 }
 109
 110 uint64_t ext4fs_sb_get_free_blocks(const struct ext2_sblock *sb)
 111 {
 112         uint64_t free_blocks = le32_to_cpu(sb->free_blocks);
 113         free_blocks += (uint64_t)le32_to_cpu(sb->free_blocks_high) << 32;
 114         return free_blocks;
 115 }
 116
 117 void ext4fs_sb_set_free_blocks(struct ext2_sblock *sb, uint64_t free_blocks)
 118 {
 119         sb->free_blocks = cpu_to_le32(free_blocks & 0xffffffff);
 120         sb->free_blocks_high = cpu_to_le16(free_blocks >> 32);
 121 }
 122
 123 uint32_t ext4fs_bg_get_free_blocks(const struct ext2_block_group *bg,
 124                                    const struct ext_filesystem *fs)
 125 {
 126         uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
 127         if (fs->gdsize == 64)
 128                 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
 129         return free_blocks;
 130 }
 131
 132 static inline
 133 uint32_t ext4fs_bg_get_free_inodes(const struct ext2_block_group *bg,
 134                                    const struct ext_filesystem *fs)
 135 {
 136         uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
 137         if (fs->gdsize == 64)
 138                 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
 139         return free_inodes;
 140 }
 141
 142 static inline uint16_t ext4fs_bg_get_flags(const struct ext2_block_group *bg)
 143 {
 144         return le16_to_cpu(bg->bg_flags);
 145 }
 146
 147 static inline void ext4fs_bg_set_flags(struct ext2_block_group *bg,
 148                                        uint16_t flags)
 149 {
 150         bg->bg_flags = cpu_to_le16(flags);
 151 }
 152
 153 /* Block number of the block bitmap */
 154 uint64_t ext4fs_bg_get_block_id(const struct ext2_block_group *bg,
 155                                 const struct ext_filesystem *fs)
 156 {
 157         uint64_t block_nr = le32_to_cpu(bg->block_id);
 158         if (fs->gdsize == 64)
 159                 block_nr += (uint64_t)le32_to_cpu(bg->block_id_high) << 32;
 160         return block_nr;
 161 }
 162
 163 /* Block number of the inode bitmap */
 164 uint64_t ext4fs_bg_get_inode_id(const struct ext2_block_group *bg,
 165                                 const struct ext_filesystem *fs)
 166 {
 167         uint64_t block_nr = le32_to_cpu(bg->inode_id);
 168         if (fs->gdsize == 64)
 169                 block_nr += (uint64_t)le32_to_cpu(bg->inode_id_high) << 32;
 170         return block_nr;
 171 }
 172 #endif
 173
 174 /* Block number of the inode table */
 175 uint64_t ext4fs_bg_get_inode_table_id(const struct ext2_block_group *bg,
 176                                       const struct ext_filesystem *fs)
 177 {
 178         uint64_t block_nr = le32_to_cpu(bg->inode_table_id);
 179         if (fs->gdsize == 64)
 180                 block_nr +=
 181                         (uint64_t)le32_to_cpu(bg->inode_table_id_high) << 32;
 182         return block_nr;
 183 }
 184
 185 #if defined(CONFIG_EXT4_WRITE)
 186 uint32_t ext4fs_div_roundup(uint32_t size, uint32_t n)
 187 {
 188         uint32_t res = size / n;
 189         if (res * n != size)
 190                 res++;
 191
 192         return res;
 193 }
 194
 195 void put_ext4(uint64_t off, void *buf, uint32_t size)
 196 {
 197         uint64_t startblock;
 198         uint64_t remainder;
 199         unsigned char *temp_ptr = NULL;
 200         struct ext_filesystem *fs = get_fs();
 201         int log2blksz = fs->dev_desc->log2blksz;
 202         ALLOC_CACHE_ALIGN_BUFFER(unsigned char, sec_buf, fs->dev_desc->blksz);
 203
 204         startblock = off >> log2blksz;
 205         startblock += part_offset;
 206         remainder = off & (uint64_t)(fs->dev_desc->blksz - 1);
 207
 208         if (fs->dev_desc == NULL)
 209                 return;
 210
 211         if ((startblock + (size >> log2blksz)) >
 212             (part_offset + fs->total_sect)) {
 213                 printf("part_offset is " LBAFU "\n", part_offset);
 214                 printf("total_sector is %" PRIu64 "\n", fs->total_sect);
 215                 printf("error: overflow occurs\n");
 216                 return;
 217         }
 218
 219         if (remainder) {
 220                 blk_dread(fs->dev_desc, startblock, 1, sec_buf);
 221                 temp_ptr = sec_buf;
 222                 memcpy((temp_ptr + remainder), (unsigned char *)buf, size);
 223                 blk_dwrite(fs->dev_desc, startblock, 1, sec_buf);
 224         } else {
 225                 if (size >> log2blksz != 0) {
 226                         blk_dwrite(fs->dev_desc, startblock, size >> log2blksz,
 227                                    (unsigned long *)buf);
 228                 } else {
 229                         blk_dread(fs->dev_desc, startblock, 1, sec_buf);
 230                         temp_ptr = sec_buf;
 231                         memcpy(temp_ptr, buf, size);
 232                         blk_dwrite(fs->dev_desc, startblock, 1,
 233                                    (unsigned long *)sec_buf);
 234                 }
 235         }
 236 }
 237
 238 static int _get_new_inode_no(unsigned char *buffer)
 239 {
 240         struct ext_filesystem *fs = get_fs();
 241         unsigned char input;
 242         int operand, status;
 243         int count = 1;
 244         int j = 0;
 245
 246         /* get the blocksize of the filesystem */
 247         unsigned char *ptr = buffer;
 248         while (*ptr == 255) {
 249                 ptr++;
 250                 count += 8;
 251                 if (count > le32_to_cpu(ext4fs_root->sblock.inodes_per_group))
 252                         return -1;
 253         }
 254
 255         for (j = 0; j < fs->blksz; j++) {
 256                 input = *ptr;
 257                 int i = 0;
 258                 while (i <= 7) {
 259                         operand = 1 << i;
 260                         status = input & operand;
 261                         if (status) {
 262                                 i++;
 263                                 count++;
 264                         } else {
 265                                 *ptr |= operand;
 266                                 return count;
 267                         }
 268                 }
 269                 ptr = ptr + 1;
 270         }
 271
 272         return -1;
 273 }
 274
 275 static int _get_new_blk_no(unsigned char *buffer)
 276 {
 277         int operand;
 278         int count = 0;
 279         int i;
 280         unsigned char *ptr = buffer;
 281         struct ext_filesystem *fs = get_fs();
 282
 283         while (*ptr == 255) {
 284                 ptr++;
 285                 count += 8;
 286                 if (count == (fs->blksz * 8))
 287                         return -1;
 288         }
 289
 290         if (fs->blksz == 1024)
 291                 count += 1;
 292
 293         for (i = 0; i <= 7; i++) {
 294                 operand = 1 << i;
 295                 if (*ptr & operand) {
 296                         count++;
 297                 } else {
 298                         *ptr |= operand;
 299                         return count;
 300                 }
 301         }
 302
 303         return -1;
 304 }
 305
 306 int ext4fs_set_block_bmap(long int blockno, unsigned char *buffer, int index)
 307 {
 308         int i, remainder, status;
 309         unsigned char *ptr = buffer;
 310         unsigned char operand;
 311         i = blockno / 8;
 312         remainder = blockno % 8;
 313         int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
 314
 315         i = i - (index * blocksize);
 316         if (blocksize != 1024) {
 317                 ptr = ptr + i;
 318                 operand = 1 << remainder;
 319                 status = *ptr & operand;
 320                 if (status)
 321                         return -1;
 322
 323                 *ptr = *ptr | operand;
 324                 return 0;
 325         } else {
 326                 if (remainder == 0) {
 327                         ptr = ptr + i - 1;
 328                         operand = (1 << 7);
 329                 } else {
 330                         ptr = ptr + i;
 331                         operand = (1 << (remainder - 1));
 332                 }
 333                 status = *ptr & operand;
 334                 if (status)
 335                         return -1;
 336
 337                 *ptr = *ptr | operand;
 338                 return 0;
 339         }
 340 }
 341
 342 void ext4fs_reset_block_bmap(long int blockno, unsigned char *buffer, int index)
 343 {
 344         int i, remainder, status;
 345         unsigned char *ptr = buffer;
 346         unsigned char operand;
 347         i = blockno / 8;
 348         remainder = blockno % 8;
 349         int blocksize = EXT2_BLOCK_SIZE(ext4fs_root);
 350
 351         i = i - (index * blocksize);
 352         if (blocksize != 1024) {
 353                 ptr = ptr + i;
 354                 operand = (1 << remainder);
 355                 status = *ptr & operand;
 356                 if (status)
 357                         *ptr = *ptr & ~(operand);
 358         } else {
 359                 if (remainder == 0) {
 360                         ptr = ptr + i - 1;
 361                         operand = (1 << 7);
 362                 } else {
 363                         ptr = ptr + i;
 364                         operand = (1 << (remainder - 1));
 365                 }
 366                 status = *ptr & operand;
 367                 if (status)
 368                         *ptr = *ptr & ~(operand);
 369         }
 370 }
 371
 372 int ext4fs_set_inode_bmap(int inode_no, unsigned char *buffer, int index)
 373 {
 374         int i, remainder, status;
 375         unsigned char *ptr = buffer;
 376         unsigned char operand;
 377
 378         inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
 379         i = inode_no / 8;
 380         remainder = inode_no % 8;
 381         if (remainder == 0) {
 382                 ptr = ptr + i - 1;
 383                 operand = (1 << 7);
 384         } else {
 385                 ptr = ptr + i;
 386                 operand = (1 << (remainder - 1));
 387         }
 388         status = *ptr & operand;
 389         if (status)
 390                 return -1;
 391
 392         *ptr = *ptr | operand;
 393
 394         return 0;
 395 }
 396
 397 void ext4fs_reset_inode_bmap(int inode_no, unsigned char *buffer, int index)
 398 {
 399         int i, remainder, status;
 400         unsigned char *ptr = buffer;
 401         unsigned char operand;
 402
 403         inode_no -= (index * le32_to_cpu(ext4fs_root->sblock.inodes_per_group));
 404         i = inode_no / 8;
 405         remainder = inode_no % 8;
 406         if (remainder == 0) {
 407                 ptr = ptr + i - 1;
 408                 operand = (1 << 7);
 409         } else {
 410                 ptr = ptr + i;
 411                 operand = (1 << (remainder - 1));
 412         }
 413         status = *ptr & operand;
 414         if (status)
 415                 *ptr = *ptr & ~(operand);
 416 }
 417
 418 uint16_t ext4fs_checksum_update(uint32_t i)
 419 {
 420         struct ext2_block_group *desc;
 421         struct ext_filesystem *fs = get_fs();
 422         uint16_t crc = 0;
 423         __le32 le32_i = cpu_to_le32(i);
 424
 425         desc = ext4fs_get_group_descriptor(fs, i);
 426         if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
 427                 int offset = offsetof(struct ext2_block_group, bg_checksum);
 428
 429                 crc = ext2fs_crc16(~0, fs->sb->unique_id,
 430                                    sizeof(fs->sb->unique_id));
 431                 crc = ext2fs_crc16(crc, &le32_i, sizeof(le32_i));
 432                 crc = ext2fs_crc16(crc, desc, offset);
 433                 offset += sizeof(desc->bg_checksum);    /* skip checksum */
 434                 assert(offset == sizeof(*desc));
 435         }
 436
 437         return crc;
 438 }
 439
 440 static int check_void_in_dentry(struct ext2_dirent *dir, char *filename)
 441 {
 442         int dentry_length;
 443         int sizeof_void_space;
 444         int new_entry_byte_reqd;
 445         short padding_factor = 0;
 446
 447         if (dir->namelen % 4 != 0)
 448                 padding_factor = 4 - (dir->namelen % 4);
 449
 450         dentry_length = sizeof(struct ext2_dirent) +
 451                         dir->namelen + padding_factor;
 452         sizeof_void_space = le16_to_cpu(dir->direntlen) - dentry_length;
 453         if (sizeof_void_space == 0)
 454                 return 0;
 455
 456         padding_factor = 0;
 457         if (strlen(filename) % 4 != 0)
 458                 padding_factor = 4 - (strlen(filename) % 4);
 459
 460         new_entry_byte_reqd = strlen(filename) +
 461             sizeof(struct ext2_dirent) + padding_factor;
 462         if (sizeof_void_space >= new_entry_byte_reqd) {
 463                 dir->direntlen = cpu_to_le16(dentry_length);
 464                 return sizeof_void_space;
 465         }
 466
 467         return 0;
 468 }
 469
 470 int ext4fs_update_parent_dentry(char *filename, int file_type)
 471 {
 472         unsigned int *zero_buffer = NULL;
 473         char *root_first_block_buffer = NULL;
 474         int blk_idx;
 475         long int first_block_no_of_root = 0;
 476         int totalbytes = 0;
 477         unsigned int new_entry_byte_reqd;
 478         int sizeof_void_space = 0;
 479         int templength = 0;
 480         int inodeno = -1;
 481         int status;
 482         struct ext_filesystem *fs = get_fs();
 483         /* directory entry */
 484         struct ext2_dirent *dir;
 485         char *temp_dir = NULL;
 486         uint32_t new_blk_no;
 487         uint32_t new_size;
 488         uint32_t new_blockcnt;
 489         uint32_t directory_blocks;
 490
 491         zero_buffer = zalloc(fs->blksz);
 492         if (!zero_buffer) {
 493                 printf("No Memory\n");
 494                 return -1;
 495         }
 496         root_first_block_buffer = zalloc(fs->blksz);
 497         if (!root_first_block_buffer) {
 498                 free(zero_buffer);
 499                 printf("No Memory\n");
 500                 return -1;
 501         }
 502         new_entry_byte_reqd = ROUND(strlen(filename) +
 503                                     sizeof(struct ext2_dirent), 4);
 504 restart:
 505         directory_blocks = le32_to_cpu(g_parent_inode->size) >>
 506                 LOG2_BLOCK_SIZE(ext4fs_root);
 507         blk_idx = directory_blocks - 1;
 508
 509 restart_read:
 510         /* read the block no allocated to a file */
 511         first_block_no_of_root = read_allocated_block(g_parent_inode, blk_idx);
 512         if (first_block_no_of_root <= 0)
 513                 goto fail;
 514
 515         status = ext4fs_devread((lbaint_t)first_block_no_of_root
 516                                 * fs->sect_perblk,
 517                                 0, fs->blksz, root_first_block_buffer);
 518         if (status == 0)
 519                 goto fail;
 520
 521         if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
 522                 goto fail;
 523         dir = (struct ext2_dirent *)root_first_block_buffer;
 524         totalbytes = 0;
 525
 526         while (le16_to_cpu(dir->direntlen) > 0) {
 527                 unsigned short used_len = ROUND(dir->namelen +
 528                     sizeof(struct ext2_dirent), 4);
 529
 530                 /* last entry of block */
 531                 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) {
 532
 533                         /* check if new entry fits */
 534                         if ((used_len + new_entry_byte_reqd) <=
 535                             le16_to_cpu(dir->direntlen)) {
 536                                 dir->direntlen = cpu_to_le16(used_len);
 537                                 break;
 538                         } else {
 539                                 if (blk_idx > 0) {
 540                                         printf("Block full, trying previous\n");
 541                                         blk_idx--;
 542                                         goto restart_read;
 543                                 }
 544                                 printf("All blocks full: Allocate new\n");
 545
 546                                 if (le32_to_cpu(g_parent_inode->flags) &
 547                                                 EXT4_EXTENTS_FL) {
 548                                         printf("Directory uses extents\n");
 549                                         goto fail;
 550                                 }
 551                                 if (directory_blocks >= INDIRECT_BLOCKS) {
 552                                         printf("Directory exceeds limit\n");
 553                                         goto fail;
 554                                 }
 555                                 new_blk_no = ext4fs_get_new_blk_no();
 556                                 if (new_blk_no == -1) {
 557                                         printf("no block left to assign\n");
 558                                         goto fail;
 559                                 }
 560                                 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz);
 561                                 g_parent_inode->b.blocks.
 562                                         dir_blocks[directory_blocks] =
 563                                         cpu_to_le32(new_blk_no);
 564
 565                                 new_size = le32_to_cpu(g_parent_inode->size);
 566                                 new_size += fs->blksz;
 567                                 g_parent_inode->size = cpu_to_le32(new_size);
 568
 569                                 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt);
 570                                 new_blockcnt += fs->sect_perblk;
 571                                 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt);
 572
 573                                 if (ext4fs_put_metadata
 574                                     (root_first_block_buffer,
 575                                      first_block_no_of_root))
 576                                         goto fail;
 577                                 goto restart;
 578                         }
 579                 }
 580
 581                 templength = le16_to_cpu(dir->direntlen);
 582                 totalbytes = totalbytes + templength;
 583                 sizeof_void_space = check_void_in_dentry(dir, filename);
 584                 if (sizeof_void_space)
 585                         break;
 586
 587                 dir = (struct ext2_dirent *)((char *)dir + templength);
 588         }
 589
 590         /* make a pointer ready for creating next directory entry */
 591         templength = le16_to_cpu(dir->direntlen);
 592         totalbytes = totalbytes + templength;
 593         dir = (struct ext2_dirent *)((char *)dir + templength);
 594
 595         /* get the next available inode number */
 596         inodeno = ext4fs_get_new_inode_no();
 597         if (inodeno == -1) {
 598                 printf("no inode left to assign\n");
 599                 goto fail;
 600         }
 601         dir->inode = cpu_to_le32(inodeno);
 602         if (sizeof_void_space)
 603                 dir->direntlen = cpu_to_le16(sizeof_void_space);
 604         else
 605                 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes);
 606
 607         dir->namelen = strlen(filename);
 608         dir->filetype = FILETYPE_REG;   /* regular file */
 609         temp_dir = (char *)dir;
 610         temp_dir = temp_dir + sizeof(struct ext2_dirent);
 611         memcpy(temp_dir, filename, strlen(filename));
 612
 613         /* update or write  the 1st block of root inode */
 614         if (ext4fs_put_metadata(root_first_block_buffer,
 615                                 first_block_no_of_root))
 616                 goto fail;
 617
 618 fail:
 619         free(zero_buffer);
 620         free(root_first_block_buffer);
 621
 622         return inodeno;
 623 }
 624
 625 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
 626 {
 627         int status;
 628         int inodeno = 0;
 629         int offset;
 630         int blk_idx;
 631         long int blknr;
 632         char *block_buffer = NULL;
 633         struct ext2_dirent *dir = NULL;
 634         struct ext_filesystem *fs = get_fs();
 635         uint32_t directory_blocks;
 636         char *direntname;
 637
 638         directory_blocks = le32_to_cpu(parent_inode->size) >>
 639                 LOG2_BLOCK_SIZE(ext4fs_root);
 640
 641         block_buffer = zalloc(fs->blksz);
 642         if (!block_buffer)
 643                 goto fail;
 644
 645         /* get the block no allocated to a file */
 646         for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
 647                 blknr = read_allocated_block(parent_inode, blk_idx);
 648                 if (blknr <= 0)
 649                         goto fail;
 650
 651                 /* read the directory block */
 652                 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
 653                                         0, fs->blksz, (char *)block_buffer);
 654                 if (status == 0)
 655                         goto fail;
 656
 657                 offset = 0;
 658                 do {
 659                         dir = (struct ext2_dirent *)(block_buffer + offset);
 660                         direntname = (char*)(dir) + sizeof(struct ext2_dirent);
 661
 662                         int direntlen = le16_to_cpu(dir->direntlen);
 663                         if (direntlen < sizeof(struct ext2_dirent))
 664                                 break;
 665
 666                         if (dir->inode && (strlen(dirname) == dir->namelen) &&
 667                             (strncmp(dirname, direntname, dir->namelen) == 0)) {
 668                                 inodeno = le32_to_cpu(dir->inode);
 669                                 break;
 670                         }
 671
 672                         offset += direntlen;
 673
 674                 } while (offset < fs->blksz);
 675
 676                 if (inodeno > 0) {
 677                         free(block_buffer);
 678                         return inodeno;
 679                 }
 680         }
 681
 682 fail:
 683         free(block_buffer);
 684
 685         return -1;
 686 }
 687
 688 static int find_dir_depth(char *dirname)
 689 {
 690         char *token = strtok(dirname, "/");
 691         int count = 0;
 692         while (token != NULL) {
 693                 token = strtok(NULL, "/");
 694                 count++;
 695         }
 696         return count + 1 + 1;
 697         /*
 698          * for example  for string /home/temp
 699          * depth=home(1)+temp(1)+1 extra for NULL;
 700          * so count is 4;
 701          */
 702 }
 703
 704 static int parse_path(char **arr, char *dirname)
 705 {
 706         char *token = strtok(dirname, "/");
 707         int i = 0;
 708
 709         /* add root */
 710         arr[i] = zalloc(strlen("/") + 1);
 711         if (!arr[i])
 712                 return -ENOMEM;
 713         memcpy(arr[i++], "/", strlen("/"));
 714
 715         /* add each path entry after root */
 716         while (token != NULL) {
 717                 arr[i] = zalloc(strlen(token) + 1);
 718                 if (!arr[i])
 719                         return -ENOMEM;
 720                 memcpy(arr[i++], token, strlen(token));
 721                 token = strtok(NULL, "/");
 722         }
 723         arr[i] = NULL;
 724
 725         return 0;
 726 }
 727
 728 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
 729 {
 730         if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
 731                 return -1;
 732
 733         return 0;
 734 }
 735
 736 /*
 737  * Function: ext4fs_get_parent_inode_num
 738  * Return Value: inode Number of the parent directory of  file/Directory to be
 739  * created
 740  * dirname : Input parmater, input path name of the file/directory to be created
 741  * dname : Output parameter, to be filled with the name of the directory
 742  * extracted from dirname
 743  */
 744 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
 745 {
 746         int i;
 747         int depth = 0;
 748         int matched_inode_no;
 749         int result_inode_no = -1;
 750         char **ptr = NULL;
 751         char *depth_dirname = NULL;
 752         char *parse_dirname = NULL;
 753         struct ext2_inode *parent_inode = NULL;
 754         struct ext2_inode *first_inode = NULL;
 755         struct ext2_inode temp_inode;
 756
 757         if (*dirname != '/') {
 758                 printf("Please supply Absolute path\n");
 759                 return -1;
 760         }
 761
 762         /* TODO: input validation make equivalent to linux */
 763         depth_dirname = zalloc(strlen(dirname) + 1);
 764         if (!depth_dirname)
 765                 return -ENOMEM;
 766
 767         memcpy(depth_dirname, dirname, strlen(dirname));
 768         depth = find_dir_depth(depth_dirname);
 769         parse_dirname = zalloc(strlen(dirname) + 1);
 770         if (!parse_dirname)
 771                 goto fail;
 772         memcpy(parse_dirname, dirname, strlen(dirname));
 773
 774         /* allocate memory for each directory level */
 775         ptr = zalloc((depth) * sizeof(char *));
 776         if (!ptr)
 777                 goto fail;
 778         if (parse_path(ptr, parse_dirname))
 779                 goto fail;
 780         parent_inode = zalloc(sizeof(struct ext2_inode));
 781         if (!parent_inode)
 782                 goto fail;
 783         first_inode = zalloc(sizeof(struct ext2_inode));
 784         if (!first_inode)
 785                 goto fail;
 786         memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
 787         memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
 788         if (flags & F_FILE)
 789                 result_inode_no = EXT2_ROOT_INO;
 790         for (i = 1; i < depth; i++) {
 791                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 792                 if (matched_inode_no == -1) {
 793                         if (ptr[i + 1] == NULL && i == 1) {
 794                                 result_inode_no = EXT2_ROOT_INO;
 795                                 goto end;
 796                         } else {
 797                                 if (ptr[i + 1] == NULL)
 798                                         break;
 799                                 printf("Invalid path\n");
 800                                 result_inode_no = -1;
 801                                 goto fail;
 802                         }
 803                 } else {
 804                         if (ptr[i + 1] != NULL) {
 805                                 memset(parent_inode, '\0',
 806                                        sizeof(struct ext2_inode));
 807                                 if (ext4fs_iget(matched_inode_no,
 808                                                 parent_inode)) {
 809                                         result_inode_no = -1;
 810                                         goto fail;
 811                                 }
 812                                 result_inode_no = matched_inode_no;
 813                         } else {
 814                                 break;
 815                         }
 816                 }
 817         }
 818
 819 end:
 820         if (i == 1)
 821                 matched_inode_no = search_dir(first_inode, ptr[i]);
 822         else
 823                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 824
 825         if (matched_inode_no != -1) {
 826                 ext4fs_iget(matched_inode_no, &temp_inode);
 827                 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) {
 828                         printf("It is a Directory\n");
 829                         result_inode_no = -1;
 830                         goto fail;
 831                 }
 832         }
 833
 834         if (strlen(ptr[i]) > 256) {
 835                 result_inode_no = -1;
 836                 goto fail;
 837         }
 838         memcpy(dname, ptr[i], strlen(ptr[i]));
 839
 840 fail:
 841         free(depth_dirname);
 842         free(parse_dirname);
 843         for (i = 0; i < depth; i++) {
 844                 if (!ptr[i])
 845                         break;
 846                 free(ptr[i]);
 847         }
 848         free(ptr);
 849         free(parent_inode);
 850         free(first_inode);
 851
 852         return result_inode_no;
 853 }
 854
 855 static int unlink_filename(char *filename, unsigned int blknr)
 856 {
 857         int status;
 858         int inodeno = 0;
 859         int offset;
 860         char *block_buffer = NULL;
 861         struct ext2_dirent *dir = NULL;
 862         struct ext2_dirent *previous_dir;
 863         struct ext_filesystem *fs = get_fs();
 864         int ret = -1;
 865         char *direntname;
 866
 867         block_buffer = zalloc(fs->blksz);
 868         if (!block_buffer)
 869                 return -ENOMEM;
 870
 871         /* read the directory block */
 872         status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
 873                                 fs->blksz, block_buffer);
 874         if (status == 0)
 875                 goto fail;
 876
 877         if (ext4fs_log_journal(block_buffer, blknr))
 878                 goto fail;
 879         offset = 0;
 880         do {
 881                 previous_dir = dir;
 882                 dir = (struct ext2_dirent *)(block_buffer + offset);
 883                 direntname = (char *)(dir) + sizeof(struct ext2_dirent);
 884
 885                 int direntlen = le16_to_cpu(dir->direntlen);
 886                 if (direntlen < sizeof(struct ext2_dirent))
 887                         break;
 888
 889                 if (dir->inode && (strlen(filename) == dir->namelen) &&
 890                     (strncmp(direntname, filename, dir->namelen) == 0)) {
 891                         inodeno = le32_to_cpu(dir->inode);
 892                         if (previous_dir) {
 893                                 uint16_t new_len;
 894                                 new_len = le16_to_cpu(previous_dir->direntlen);
 895                                 new_len += le16_to_cpu(dir->direntlen);
 896                                 previous_dir->direntlen = cpu_to_le16(new_len);
 897                         } else {
 898                                 dir->inode = 0;
 899                         }
 900                         break;
 901                 }
 902
 903                 offset += direntlen;
 904
 905         } while (offset < fs->blksz);
 906
 907         if (inodeno > 0) {
 908
 909                 if (ext4fs_put_metadata(block_buffer, blknr))
 910                         goto fail;
 911                 ret = inodeno;
 912         }
 913 fail:
 914         free(block_buffer);
 915
 916         return ret;
 917 }
 918
 919 int ext4fs_filename_unlink(char *filename)
 920 {
 921         int blk_idx;
 922         long int blknr = -1;
 923         int inodeno = -1;
 924         uint32_t directory_blocks;
 925
 926         directory_blocks = le32_to_cpu(g_parent_inode->size) >>
 927                 LOG2_BLOCK_SIZE(ext4fs_root);
 928
 929         /* read the block no allocated to a file */
 930         for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
 931                 blknr = read_allocated_block(g_parent_inode, blk_idx);
 932                 if (blknr <= 0)
 933                         break;
 934                 inodeno = unlink_filename(filename, blknr);
 935                 if (inodeno != -1)
 936                         return inodeno;
 937         }
 938
 939         return -1;
 940 }
 941
 942 uint32_t ext4fs_get_new_blk_no(void)
 943 {
 944         short i;
 945         short status;
 946         int remainder;
 947         unsigned int bg_idx;
 948         static int prev_bg_bitmap_index = -1;
 949         unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 950         struct ext_filesystem *fs = get_fs();
 951         char *journal_buffer = zalloc(fs->blksz);
 952         char *zero_buffer = zalloc(fs->blksz);
 953         if (!journal_buffer || !zero_buffer)
 954                 goto fail;
 955
 956         if (fs->first_pass_bbmap == 0) {
 957                 for (i = 0; i < fs->no_blkgrp; i++) {
 958                         struct ext2_block_group *bgd = NULL;
 959                         bgd = ext4fs_get_group_descriptor(fs, i);
 960                         if (ext4fs_bg_get_free_blocks(bgd, fs)) {
 961                                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
 962                                 uint64_t b_bitmap_blk =
 963                                         ext4fs_bg_get_block_id(bgd, fs);
 964                                 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
 965                                         memcpy(fs->blk_bmaps[i], zero_buffer,
 966                                                fs->blksz);
 967                                         put_ext4(b_bitmap_blk * fs->blksz,
 968                                                  fs->blk_bmaps[i], fs->blksz);
 969                                         bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
 970                                         ext4fs_bg_set_flags(bgd, bg_flags);
 971                                 }
 972                                 fs->curr_blkno =
 973                                     _get_new_blk_no(fs->blk_bmaps[i]);
 974                                 if (fs->curr_blkno == -1)
 975                                         /* block bitmap is completely filled */
 976                                         continue;
 977                                 fs->curr_blkno = fs->curr_blkno +
 978                                                 (i * fs->blksz * 8);
 979                                 fs->first_pass_bbmap++;
 980                                 ext4fs_bg_free_blocks_dec(bgd, fs);
 981                                 ext4fs_sb_free_blocks_dec(fs->sb);
 982                                 status = ext4fs_devread(b_bitmap_blk *
 983                                                         fs->sect_perblk,
 984                                                         0, fs->blksz,
 985                                                         journal_buffer);
 986                                 if (status == 0)
 987                                         goto fail;
 988                                 if (ext4fs_log_journal(journal_buffer,
 989                                                        b_bitmap_blk))
 990                                         goto fail;
 991                                 goto success;
 992                         } else {
 993                                 debug("no space left on block group %d\n", i);
 994                         }
 995                 }
 996
 997                 goto fail;
 998         } else {
 999                 fs->curr_blkno++;
1000 restart:
1001                 /* get the blockbitmap index respective to blockno */
1002                 bg_idx = fs->curr_blkno / blk_per_grp;
1003                 if (fs->blksz == 1024) {
1004                         remainder = fs->curr_blkno % blk_per_grp;
1005                         if (!remainder)
1006                                 bg_idx--;
1007                 }
1008
1009                 /*
1010                  * To skip completely filled block group bitmaps
1011                  * Optimize the block allocation
1012                  */
1013                 if (bg_idx >= fs->no_blkgrp)
1014                         goto fail;
1015
1016                 struct ext2_block_group *bgd = NULL;
1017                 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
1018                 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) {
1019                         debug("block group %u is full. Skipping\n", bg_idx);
1020                         fs->curr_blkno = (bg_idx + 1) * blk_per_grp;
1021                         if (fs->blksz == 1024)
1022                                 fs->curr_blkno += 1;
1023                         goto restart;
1024                 }
1025
1026                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1027                 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
1028                 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
1029                         memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
1030                         put_ext4(b_bitmap_blk * fs->blksz,
1031                                  zero_buffer, fs->blksz);
1032                         bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
1033                         ext4fs_bg_set_flags(bgd, bg_flags);
1034                 }
1035
1036                 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
1037                                    bg_idx) != 0) {
1038                         debug("going for restart for the block no %ld %u\n",
1039                               fs->curr_blkno, bg_idx);
1040                         fs->curr_blkno++;
1041                         goto restart;
1042                 }
1043
1044                 /* journal backup */
1045                 if (prev_bg_bitmap_index != bg_idx) {
1046                         status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
1047                                                 0, fs->blksz, journal_buffer);
1048                         if (status == 0)
1049                                 goto fail;
1050                         if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
1051                                 goto fail;
1052
1053                         prev_bg_bitmap_index = bg_idx;
1054                 }
1055                 ext4fs_bg_free_blocks_dec(bgd, fs);
1056                 ext4fs_sb_free_blocks_dec(fs->sb);
1057                 goto success;
1058         }
1059 success:
1060         free(journal_buffer);
1061         free(zero_buffer);
1062
1063         return fs->curr_blkno;
1064 fail:
1065         free(journal_buffer);
1066         free(zero_buffer);
1067
1068         return -1;
1069 }
1070
1071 int ext4fs_get_new_inode_no(void)
1072 {
1073         short i;
1074         short status;
1075         unsigned int ibmap_idx;
1076         static int prev_inode_bitmap_index = -1;
1077         unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
1078         struct ext_filesystem *fs = get_fs();
1079         char *journal_buffer = zalloc(fs->blksz);
1080         char *zero_buffer = zalloc(fs->blksz);
1081         if (!journal_buffer || !zero_buffer)
1082                 goto fail;
1083         int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) &
1084                 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0;
1085
1086         if (fs->first_pass_ibmap == 0) {
1087                 for (i = 0; i < fs->no_blkgrp; i++) {
1088                         uint32_t free_inodes;
1089                         struct ext2_block_group *bgd = NULL;
1090                         bgd = ext4fs_get_group_descriptor(fs, i);
1091                         free_inodes = ext4fs_bg_get_free_inodes(bgd, fs);
1092                         if (free_inodes) {
1093                                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1094                                 uint64_t i_bitmap_blk =
1095                                         ext4fs_bg_get_inode_id(bgd, fs);
1096                                 if (has_gdt_chksum)
1097                                         bgd->bg_itable_unused = free_inodes;
1098                                 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1099                                         put_ext4(i_bitmap_blk * fs->blksz,
1100                                                  zero_buffer, fs->blksz);
1101                                         bg_flags &= ~EXT4_BG_INODE_UNINIT;
1102                                         ext4fs_bg_set_flags(bgd, bg_flags);
1103                                         memcpy(fs->inode_bmaps[i],
1104                                                zero_buffer, fs->blksz);
1105                                 }
1106                                 fs->curr_inode_no =
1107                                     _get_new_inode_no(fs->inode_bmaps[i]);
1108                                 if (fs->curr_inode_no == -1)
1109                                         /* inode bitmap is completely filled */
1110                                         continue;
1111                                 fs->curr_inode_no = fs->curr_inode_no +
1112                                                         (i * inodes_per_grp);
1113                                 fs->first_pass_ibmap++;
1114                                 ext4fs_bg_free_inodes_dec(bgd, fs);
1115                                 if (has_gdt_chksum)
1116                                         ext4fs_bg_itable_unused_dec(bgd, fs);
1117                                 ext4fs_sb_free_inodes_dec(fs->sb);
1118                                 status = ext4fs_devread(i_bitmap_blk *
1119                                                         fs->sect_perblk,
1120                                                         0, fs->blksz,
1121                                                         journal_buffer);
1122                                 if (status == 0)
1123                                         goto fail;
1124                                 if (ext4fs_log_journal(journal_buffer,
1125                                                        i_bitmap_blk))
1126                                         goto fail;
1127                                 goto success;
1128                         } else
1129                                 debug("no inode left on block group %d\n", i);
1130                 }
1131                 goto fail;
1132         } else {
1133 restart:
1134                 fs->curr_inode_no++;
1135                 /* get the blockbitmap index respective to blockno */
1136                 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1137                 struct ext2_block_group *bgd =
1138                         ext4fs_get_group_descriptor(fs, ibmap_idx);
1139                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1140                 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
1141
1142                 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1143                         put_ext4(i_bitmap_blk * fs->blksz,
1144                                  zero_buffer, fs->blksz);
1145                         bg_flags &= ~EXT4_BG_INODE_UNINIT;
1146                         ext4fs_bg_set_flags(bgd, bg_flags);
1147                         memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1148                                 fs->blksz);
1149                 }
1150
1151                 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1152                                           fs->inode_bmaps[ibmap_idx],
1153                                           ibmap_idx) != 0) {
1154                         debug("going for restart for the block no %d %u\n",
1155                               fs->curr_inode_no, ibmap_idx);
1156                         goto restart;
1157                 }
1158
1159                 /* journal backup */
1160                 if (prev_inode_bitmap_index != ibmap_idx) {
1161                         status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk,
1162                                                 0, fs->blksz, journal_buffer);
1163                         if (status == 0)
1164                                 goto fail;
1165                         if (ext4fs_log_journal(journal_buffer,
1166                                                 le32_to_cpu(bgd->inode_id)))
1167                                 goto fail;
1168                         prev_inode_bitmap_index = ibmap_idx;
1169                 }
1170                 ext4fs_bg_free_inodes_dec(bgd, fs);
1171                 if (has_gdt_chksum)
1172                         bgd->bg_itable_unused = bgd->free_inodes;
1173                 ext4fs_sb_free_inodes_dec(fs->sb);
1174                 goto success;
1175         }
1176
1177 success:
1178         free(journal_buffer);
1179         free(zero_buffer);
1180
1181         return fs->curr_inode_no;
1182 fail:
1183         free(journal_buffer);
1184         free(zero_buffer);
1185
1186         return -1;
1187
1188 }
1189
1190
1191 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1192                                         unsigned int *total_remaining_blocks,
1193                                         unsigned int *no_blks_reqd)
1194 {
1195         short i;
1196         short status;
1197         long int actual_block_no;
1198         long int si_blockno;
1199         /* si :single indirect */
1200         __le32 *si_buffer = NULL;
1201         __le32 *si_start_addr = NULL;
1202         struct ext_filesystem *fs = get_fs();
1203
1204         if (*total_remaining_blocks != 0) {
1205                 si_buffer = zalloc(fs->blksz);
1206                 if (!si_buffer) {
1207                         printf("No Memory\n");
1208                         return;
1209                 }
1210                 si_start_addr = si_buffer;
1211                 si_blockno = ext4fs_get_new_blk_no();
1212                 if (si_blockno == -1) {
1213                         printf("no block left to assign\n");
1214                         goto fail;
1215                 }
1216                 (*no_blks_reqd)++;
1217                 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1218
1219                 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1220                                         0, fs->blksz, (char *)si_buffer);
1221                 memset(si_buffer, '\0', fs->blksz);
1222                 if (status == 0)
1223                         goto fail;
1224
1225                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1226                         actual_block_no = ext4fs_get_new_blk_no();
1227                         if (actual_block_no == -1) {
1228                                 printf("no block left to assign\n");
1229                                 goto fail;
1230                         }
1231                         *si_buffer = cpu_to_le32(actual_block_no);
1232                         debug("SIAB %u: %u\n", *si_buffer,
1233                                 *total_remaining_blocks);
1234
1235                         si_buffer++;
1236                         (*total_remaining_blocks)--;
1237                         if (*total_remaining_blocks == 0)
1238                                 break;
1239                 }
1240
1241                 /* write the block to disk */
1242                 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1243                          si_start_addr, fs->blksz);
1244                 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1245         }
1246 fail:
1247         free(si_start_addr);
1248 }
1249
1250 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1251                                         unsigned int *total_remaining_blocks,
1252                                         unsigned int *no_blks_reqd)
1253 {
1254         short i;
1255         short j;
1256         short status;
1257         long int actual_block_no;
1258         /* di:double indirect */
1259         long int di_blockno_parent;
1260         long int di_blockno_child;
1261         __le32 *di_parent_buffer = NULL;
1262         __le32 *di_child_buff = NULL;
1263         __le32 *di_block_start_addr = NULL;
1264         __le32 *di_child_buff_start = NULL;
1265         struct ext_filesystem *fs = get_fs();
1266
1267         if (*total_remaining_blocks != 0) {
1268                 /* double indirect parent block connecting to inode */
1269                 di_blockno_parent = ext4fs_get_new_blk_no();
1270                 if (di_blockno_parent == -1) {
1271                         printf("no block left to assign\n");
1272                         goto fail;
1273                 }
1274                 di_parent_buffer = zalloc(fs->blksz);
1275                 if (!di_parent_buffer)
1276                         goto fail;
1277
1278                 di_block_start_addr = di_parent_buffer;
1279                 (*no_blks_reqd)++;
1280                 debug("DIPB %ld: %u\n", di_blockno_parent,
1281                       *total_remaining_blocks);
1282
1283                 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1284                                         fs->sect_perblk, 0,
1285                                         fs->blksz, (char *)di_parent_buffer);
1286
1287                 if (!status) {
1288                         printf("%s: Device read error!\n", __func__);
1289                         goto fail;
1290                 }
1291                 memset(di_parent_buffer, '\0', fs->blksz);
1292
1293                 /*
1294                  * start:for each double indirect parent
1295                  * block create one more block
1296                  */
1297                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1298                         di_blockno_child = ext4fs_get_new_blk_no();
1299                         if (di_blockno_child == -1) {
1300                                 printf("no block left to assign\n");
1301                                 goto fail;
1302                         }
1303                         di_child_buff = zalloc(fs->blksz);
1304                         if (!di_child_buff)
1305                                 goto fail;
1306
1307                         di_child_buff_start = di_child_buff;
1308                         *di_parent_buffer = cpu_to_le32(di_blockno_child);
1309                         di_parent_buffer++;
1310                         (*no_blks_reqd)++;
1311                         debug("DICB %ld: %u\n", di_blockno_child,
1312                               *total_remaining_blocks);
1313
1314                         status = ext4fs_devread((lbaint_t)di_blockno_child *
1315                                                 fs->sect_perblk, 0,
1316                                                 fs->blksz,
1317                                                 (char *)di_child_buff);
1318
1319                         if (!status) {
1320                                 printf("%s: Device read error!\n", __func__);
1321                                 goto fail;
1322                         }
1323                         memset(di_child_buff, '\0', fs->blksz);
1324                         /* filling of actual datablocks for each child */
1325                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1326                                 actual_block_no = ext4fs_get_new_blk_no();
1327                                 if (actual_block_no == -1) {
1328                                         printf("no block left to assign\n");
1329                                         goto fail;
1330                                 }
1331                                 *di_child_buff = cpu_to_le32(actual_block_no);
1332                                 debug("DIAB %ld: %u\n", actual_block_no,
1333                                       *total_remaining_blocks);
1334
1335                                 di_child_buff++;
1336                                 (*total_remaining_blocks)--;
1337                                 if (*total_remaining_blocks == 0)
1338                                         break;
1339                         }
1340                         /* write the block  table */
1341                         put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1342                                  di_child_buff_start, fs->blksz);
1343                         free(di_child_buff_start);
1344                         di_child_buff_start = NULL;
1345
1346                         if (*total_remaining_blocks == 0)
1347                                 break;
1348                 }
1349                 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1350                          di_block_start_addr, fs->blksz);
1351                 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1352         }
1353 fail:
1354         free(di_block_start_addr);
1355 }
1356
1357 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1358                                         unsigned int *total_remaining_blocks,
1359                                         unsigned int *no_blks_reqd)
1360 {
1361         short i;
1362         short j;
1363         short k;
1364         long int actual_block_no;
1365         /* ti: Triple Indirect */
1366         long int ti_gp_blockno;
1367         long int ti_parent_blockno;
1368         long int ti_child_blockno;
1369         __le32 *ti_gp_buff = NULL;
1370         __le32 *ti_parent_buff = NULL;
1371         __le32 *ti_child_buff = NULL;
1372         __le32 *ti_gp_buff_start_addr = NULL;
1373         __le32 *ti_pbuff_start_addr = NULL;
1374         __le32 *ti_cbuff_start_addr = NULL;
1375         struct ext_filesystem *fs = get_fs();
1376         if (*total_remaining_blocks != 0) {
1377                 /* triple indirect grand parent block connecting to inode */
1378                 ti_gp_blockno = ext4fs_get_new_blk_no();
1379                 if (ti_gp_blockno == -1) {
1380                         printf("no block left to assign\n");
1381                         return;
1382                 }
1383                 ti_gp_buff = zalloc(fs->blksz);
1384                 if (!ti_gp_buff)
1385                         return;
1386
1387                 ti_gp_buff_start_addr = ti_gp_buff;
1388                 (*no_blks_reqd)++;
1389                 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1390                       *total_remaining_blocks);
1391
1392                 /* for each 4 byte grand parent entry create one more block */
1393                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1394                         ti_parent_blockno = ext4fs_get_new_blk_no();
1395                         if (ti_parent_blockno == -1) {
1396                                 printf("no block left to assign\n");
1397                                 goto fail;
1398                         }
1399                         ti_parent_buff = zalloc(fs->blksz);
1400                         if (!ti_parent_buff)
1401                                 goto fail;
1402
1403                         ti_pbuff_start_addr = ti_parent_buff;
1404                         *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1405                         ti_gp_buff++;
1406                         (*no_blks_reqd)++;
1407                         debug("TIPB %ld: %u\n", ti_parent_blockno,
1408                               *total_remaining_blocks);
1409
1410                         /* for each 4 byte entry parent create one more block */
1411                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1412                                 ti_child_blockno = ext4fs_get_new_blk_no();
1413                                 if (ti_child_blockno == -1) {
1414                                         printf("no block left assign\n");
1415                                         goto fail1;
1416                                 }
1417                                 ti_child_buff = zalloc(fs->blksz);
1418                                 if (!ti_child_buff)
1419                                         goto fail1;
1420
1421                                 ti_cbuff_start_addr = ti_child_buff;
1422                                 *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1423                                 ti_parent_buff++;
1424                                 (*no_blks_reqd)++;
1425                                 debug("TICB %ld: %u\n", ti_parent_blockno,
1426                                       *total_remaining_blocks);
1427
1428                                 /* fill actual datablocks for each child */
1429                                 for (k = 0; k < (fs->blksz / sizeof(int));
1430                                         k++) {
1431                                         actual_block_no =
1432                                             ext4fs_get_new_blk_no();
1433                                         if (actual_block_no == -1) {
1434                                                 printf("no block left\n");
1435                                                 free(ti_cbuff_start_addr);
1436                                                 goto fail1;
1437                                         }
1438                                         *ti_child_buff = cpu_to_le32(actual_block_no);
1439                                         debug("TIAB %ld: %u\n", actual_block_no,
1440                                               *total_remaining_blocks);
1441
1442                                         ti_child_buff++;
1443                                         (*total_remaining_blocks)--;
1444                                         if (*total_remaining_blocks == 0)
1445                                                 break;
1446                                 }
1447                                 /* write the child block */
1448                                 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1449                                                       (uint64_t)fs->blksz)),
1450                                          ti_cbuff_start_addr, fs->blksz);
1451                                 free(ti_cbuff_start_addr);
1452
1453                                 if (*total_remaining_blocks == 0)
1454                                         break;
1455                         }
1456                         /* write the parent block */
1457                         put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1458                                  ti_pbuff_start_addr, fs->blksz);
1459                         free(ti_pbuff_start_addr);
1460
1461                         if (*total_remaining_blocks == 0)
1462                                 break;
1463                 }
1464                 /* write the grand parent block */
1465                 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1466                          ti_gp_buff_start_addr, fs->blksz);
1467                 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1468                 free(ti_gp_buff_start_addr);
1469                 return;
1470         }
1471 fail1:
1472         free(ti_pbuff_start_addr);
1473 fail:
1474         free(ti_gp_buff_start_addr);
1475 }
1476
1477 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1478                                 unsigned int total_remaining_blocks,
1479                                 unsigned int *total_no_of_block)
1480 {
1481         short i;
1482         long int direct_blockno;
1483         unsigned int no_blks_reqd = 0;
1484
1485         /* allocation of direct blocks */
1486         for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1487                 direct_blockno = ext4fs_get_new_blk_no();
1488                 if (direct_blockno == -1) {
1489                         printf("no block left to assign\n");
1490                         return;
1491                 }
1492                 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1493                 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1494
1495                 total_remaining_blocks--;
1496         }
1497
1498         alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1499                                     &no_blks_reqd);
1500         alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1501                                     &no_blks_reqd);
1502         alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1503                                     &no_blks_reqd);
1504         *total_no_of_block += no_blks_reqd;
1505 }
1506
1507 #endif
1508
1509 static struct ext4_extent_header *ext4fs_get_extent_block
1510         (struct ext2_data *data, char *buf,
1511                 struct ext4_extent_header *ext_block,
1512                 uint32_t fileblock, int log2_blksz)
1513 {
1514         struct ext4_extent_idx *index;
1515         unsigned long long block;
1516         int blksz = EXT2_BLOCK_SIZE(data);
1517         int i;
1518
1519         while (1) {
1520                 index = (struct ext4_extent_idx *)(ext_block + 1);
1521
1522                 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1523                         return NULL;
1524
1525                 if (ext_block->eh_depth == 0)
1526                         return ext_block;
1527                 i = -1;
1528                 do {
1529                         i++;
1530                         if (i >= le16_to_cpu(ext_block->eh_entries))
1531                                 break;
1532                 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1533
1534                 if (--i < 0)
1535                         return NULL;
1536
1537                 block = le16_to_cpu(index[i].ei_leaf_hi);
1538                 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1539
1540                 if (ext4fs_devread((lbaint_t)block << log2_blksz, 0, blksz,
1541                                    buf))
1542                         ext_block = (struct ext4_extent_header *)buf;
1543                 else
1544                         return NULL;
1545         }
1546 }
1547
1548 static int ext4fs_blockgroup
1549         (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1550 {
1551         long int blkno;
1552         unsigned int blkoff, desc_per_blk;
1553         int log2blksz = get_fs()->dev_desc->log2blksz;
1554         int desc_size = get_fs()->gdsize;
1555
1556         desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size;
1557
1558         blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1559                         group / desc_per_blk;
1560         blkoff = (group % desc_per_blk) * desc_size;
1561
1562         debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1563               group, blkno, blkoff);
1564
1565         return ext4fs_devread((lbaint_t)blkno <<
1566                               (LOG2_BLOCK_SIZE(data) - log2blksz),
1567                               blkoff, desc_size, (char *)blkgrp);
1568 }
1569
1570 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1571 {
1572         struct ext2_block_group blkgrp;
1573         struct ext2_sblock *sblock = &data->sblock;
1574         struct ext_filesystem *fs = get_fs();
1575         int log2blksz = get_fs()->dev_desc->log2blksz;
1576         int inodes_per_block, status;
1577         long int blkno;
1578         unsigned int blkoff;
1579
1580         /* It is easier to calculate if the first inode is 0. */
1581         ino--;
1582         status = ext4fs_blockgroup(data, ino / le32_to_cpu
1583                                    (sblock->inodes_per_group), &blkgrp);
1584         if (status == 0)
1585                 return 0;
1586
1587         inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1588         blkno = ext4fs_bg_get_inode_table_id(&blkgrp, fs) +
1589             (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1590         blkoff = (ino % inodes_per_block) * fs->inodesz;
1591         /* Read the inode. */
1592         status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1593                                 log2blksz), blkoff,
1594                                 sizeof(struct ext2_inode), (char *)inode);
1595         if (status == 0)
1596                 return 0;
1597
1598         return 1;
1599 }
1600
1601 long int read_allocated_block(struct ext2_inode *inode, int fileblock)
1602 {
1603         long int blknr;
1604         int blksz;
1605         int log2_blksz;
1606         int status;
1607         long int rblock;
1608         long int perblock_parent;
1609         long int perblock_child;
1610         unsigned long long start;
1611         /* get the blocksize of the filesystem */
1612         blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1613         log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1614                 - get_fs()->dev_desc->log2blksz;
1615
1616         if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1617                 char *buf = zalloc(blksz);
1618                 if (!buf)
1619                         return -ENOMEM;
1620                 struct ext4_extent_header *ext_block;
1621                 struct ext4_extent *extent;
1622                 int i = -1;
1623                 ext_block =
1624                         ext4fs_get_extent_block(ext4fs_root, buf,
1625                                                 (struct ext4_extent_header *)
1626                                                 inode->b.blocks.dir_blocks,
1627                                                 fileblock, log2_blksz);
1628                 if (!ext_block) {
1629                         printf("invalid extent block\n");
1630                         free(buf);
1631                         return -EINVAL;
1632                 }
1633
1634                 extent = (struct ext4_extent *)(ext_block + 1);
1635
1636                 do {
1637                         i++;
1638                         if (i >= le16_to_cpu(ext_block->eh_entries))
1639                                 break;
1640                 } while (fileblock >= le32_to_cpu(extent[i].ee_block));
1641                 if (--i >= 0) {
1642                         fileblock -= le32_to_cpu(extent[i].ee_block);
1643                         if (fileblock >= le16_to_cpu(extent[i].ee_len)) {
1644                                 free(buf);
1645                                 return 0;
1646                         }
1647
1648                         start = le16_to_cpu(extent[i].ee_start_hi);
1649                         start = (start << 32) +
1650                                         le32_to_cpu(extent[i].ee_start_lo);
1651                         free(buf);
1652                         return fileblock + start;
1653                 }
1654
1655                 printf("Extent Error\n");
1656                 free(buf);
1657                 return -1;
1658         }
1659
1660         /* Direct blocks. */
1661         if (fileblock < INDIRECT_BLOCKS)
1662                 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1663
1664         /* Indirect. */
1665         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1666                 if (ext4fs_indir1_block == NULL) {
1667                         ext4fs_indir1_block = zalloc(blksz);
1668                         if (ext4fs_indir1_block == NULL) {
1669                                 printf("** SI ext2fs read block (indir 1)"
1670                                         "malloc failed. **\n");
1671                                 return -1;
1672                         }
1673                         ext4fs_indir1_size = blksz;
1674                         ext4fs_indir1_blkno = -1;
1675                 }
1676                 if (blksz != ext4fs_indir1_size) {
1677                         free(ext4fs_indir1_block);
1678                         ext4fs_indir1_block = NULL;
1679                         ext4fs_indir1_size = 0;
1680                         ext4fs_indir1_blkno = -1;
1681                         ext4fs_indir1_block = zalloc(blksz);
1682                         if (ext4fs_indir1_block == NULL) {
1683                                 printf("** SI ext2fs read block (indir 1):"
1684                                         "malloc failed. **\n");
1685                                 return -1;
1686                         }
1687                         ext4fs_indir1_size = blksz;
1688                 }
1689                 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1690                      log2_blksz) != ext4fs_indir1_blkno) {
1691                         status =
1692                             ext4fs_devread((lbaint_t)le32_to_cpu
1693                                            (inode->b.blocks.
1694                                             indir_block) << log2_blksz, 0,
1695                                            blksz, (char *)ext4fs_indir1_block);
1696                         if (status == 0) {
1697                                 printf("** SI ext2fs read block (indir 1)"
1698                                         "failed. **\n");
1699                                 return -1;
1700                         }
1701                         ext4fs_indir1_blkno =
1702                                 le32_to_cpu(inode->b.blocks.
1703                                                indir_block) << log2_blksz;
1704                 }
1705                 blknr = le32_to_cpu(ext4fs_indir1_block
1706                                       [fileblock - INDIRECT_BLOCKS]);
1707         }
1708         /* Double indirect. */
1709         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1710                                         (blksz / 4 + 1)))) {
1711
1712                 long int perblock = blksz / 4;
1713                 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1714
1715                 if (ext4fs_indir1_block == NULL) {
1716                         ext4fs_indir1_block = zalloc(blksz);
1717                         if (ext4fs_indir1_block == NULL) {
1718                                 printf("** DI ext2fs read block (indir 2 1)"
1719                                         "malloc failed. **\n");
1720                                 return -1;
1721                         }
1722                         ext4fs_indir1_size = blksz;
1723                         ext4fs_indir1_blkno = -1;
1724                 }
1725                 if (blksz != ext4fs_indir1_size) {
1726                         free(ext4fs_indir1_block);
1727                         ext4fs_indir1_block = NULL;
1728                         ext4fs_indir1_size = 0;
1729                         ext4fs_indir1_blkno = -1;
1730                         ext4fs_indir1_block = zalloc(blksz);
1731                         if (ext4fs_indir1_block == NULL) {
1732                                 printf("** DI ext2fs read block (indir 2 1)"
1733                                         "malloc failed. **\n");
1734                                 return -1;
1735                         }
1736                         ext4fs_indir1_size = blksz;
1737                 }
1738                 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1739                      log2_blksz) != ext4fs_indir1_blkno) {
1740                         status =
1741                             ext4fs_devread((lbaint_t)le32_to_cpu
1742                                            (inode->b.blocks.
1743                                             double_indir_block) << log2_blksz,
1744                                            0, blksz,
1745                                            (char *)ext4fs_indir1_block);
1746                         if (status == 0) {
1747                                 printf("** DI ext2fs read block (indir 2 1)"
1748                                         "failed. **\n");
1749                                 return -1;
1750                         }
1751                         ext4fs_indir1_blkno =
1752                             le32_to_cpu(inode->b.blocks.double_indir_block) <<
1753                             log2_blksz;
1754                 }
1755
1756                 if (ext4fs_indir2_block == NULL) {
1757                         ext4fs_indir2_block = zalloc(blksz);
1758                         if (ext4fs_indir2_block == NULL) {
1759                                 printf("** DI ext2fs read block (indir 2 2)"
1760                                         "malloc failed. **\n");
1761                                 return -1;
1762                         }
1763                         ext4fs_indir2_size = blksz;
1764                         ext4fs_indir2_blkno = -1;
1765                 }
1766                 if (blksz != ext4fs_indir2_size) {
1767                         free(ext4fs_indir2_block);
1768                         ext4fs_indir2_block = NULL;
1769                         ext4fs_indir2_size = 0;
1770                         ext4fs_indir2_blkno = -1;
1771                         ext4fs_indir2_block = zalloc(blksz);
1772                         if (ext4fs_indir2_block == NULL) {
1773                                 printf("** DI ext2fs read block (indir 2 2)"
1774                                         "malloc failed. **\n");
1775                                 return -1;
1776                         }
1777                         ext4fs_indir2_size = blksz;
1778                 }
1779                 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1780                      log2_blksz) != ext4fs_indir2_blkno) {
1781                         status = ext4fs_devread((lbaint_t)le32_to_cpu
1782                                                 (ext4fs_indir1_block
1783                                                  [rblock /
1784                                                   perblock]) << log2_blksz, 0,
1785                                                 blksz,
1786                                                 (char *)ext4fs_indir2_block);
1787                         if (status == 0) {
1788                                 printf("** DI ext2fs read block (indir 2 2)"
1789                                         "failed. **\n");
1790                                 return -1;
1791                         }
1792                         ext4fs_indir2_blkno =
1793                             le32_to_cpu(ext4fs_indir1_block[rblock
1794                                                               /
1795                                                               perblock]) <<
1796                             log2_blksz;
1797                 }
1798                 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1799         }
1800         /* Tripple indirect. */
1801         else {
1802                 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1803                                       (blksz / 4 * blksz / 4));
1804                 perblock_child = blksz / 4;
1805                 perblock_parent = ((blksz / 4) * (blksz / 4));
1806
1807                 if (ext4fs_indir1_block == NULL) {
1808                         ext4fs_indir1_block = zalloc(blksz);
1809                         if (ext4fs_indir1_block == NULL) {
1810                                 printf("** TI ext2fs read block (indir 2 1)"
1811                                         "malloc failed. **\n");
1812                                 return -1;
1813                         }
1814                         ext4fs_indir1_size = blksz;
1815                         ext4fs_indir1_blkno = -1;
1816                 }
1817                 if (blksz != ext4fs_indir1_size) {
1818                         free(ext4fs_indir1_block);
1819                         ext4fs_indir1_block = NULL;
1820                         ext4fs_indir1_size = 0;
1821                         ext4fs_indir1_blkno = -1;
1822                         ext4fs_indir1_block = zalloc(blksz);
1823                         if (ext4fs_indir1_block == NULL) {
1824                                 printf("** TI ext2fs read block (indir 2 1)"
1825                                         "malloc failed. **\n");
1826                                 return -1;
1827                         }
1828                         ext4fs_indir1_size = blksz;
1829                 }
1830                 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1831                      log2_blksz) != ext4fs_indir1_blkno) {
1832                         status = ext4fs_devread
1833                             ((lbaint_t)
1834                              le32_to_cpu(inode->b.blocks.triple_indir_block)
1835                              << log2_blksz, 0, blksz,
1836                              (char *)ext4fs_indir1_block);
1837                         if (status == 0) {
1838                                 printf("** TI ext2fs read block (indir 2 1)"
1839                                         "failed. **\n");
1840                                 return -1;
1841                         }
1842                         ext4fs_indir1_blkno =
1843                             le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1844                             log2_blksz;
1845                 }
1846
1847                 if (ext4fs_indir2_block == NULL) {
1848                         ext4fs_indir2_block = zalloc(blksz);
1849                         if (ext4fs_indir2_block == NULL) {
1850                                 printf("** TI ext2fs read block (indir 2 2)"
1851                                         "malloc failed. **\n");
1852                                 return -1;
1853                         }
1854                         ext4fs_indir2_size = blksz;
1855                         ext4fs_indir2_blkno = -1;
1856                 }
1857                 if (blksz != ext4fs_indir2_size) {
1858                         free(ext4fs_indir2_block);
1859                         ext4fs_indir2_block = NULL;
1860                         ext4fs_indir2_size = 0;
1861                         ext4fs_indir2_blkno = -1;
1862                         ext4fs_indir2_block = zalloc(blksz);
1863                         if (ext4fs_indir2_block == NULL) {
1864                                 printf("** TI ext2fs read block (indir 2 2)"
1865                                         "malloc failed. **\n");
1866                                 return -1;
1867                         }
1868                         ext4fs_indir2_size = blksz;
1869                 }
1870                 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1871                                                        perblock_parent]) <<
1872                      log2_blksz)
1873                     != ext4fs_indir2_blkno) {
1874                         status = ext4fs_devread((lbaint_t)le32_to_cpu
1875                                                 (ext4fs_indir1_block
1876                                                  [rblock /
1877                                                   perblock_parent]) <<
1878                                                 log2_blksz, 0, blksz,
1879                                                 (char *)ext4fs_indir2_block);
1880                         if (status == 0) {
1881                                 printf("** TI ext2fs read block (indir 2 2)"
1882                                         "failed. **\n");
1883                                 return -1;
1884                         }
1885                         ext4fs_indir2_blkno =
1886                             le32_to_cpu(ext4fs_indir1_block[rblock /
1887                                                               perblock_parent])
1888                             << log2_blksz;
1889                 }
1890
1891                 if (ext4fs_indir3_block == NULL) {
1892                         ext4fs_indir3_block = zalloc(blksz);
1893                         if (ext4fs_indir3_block == NULL) {
1894                                 printf("** TI ext2fs read block (indir 2 2)"
1895                                         "malloc failed. **\n");
1896                                 return -1;
1897                         }
1898                         ext4fs_indir3_size = blksz;
1899                         ext4fs_indir3_blkno = -1;
1900                 }
1901                 if (blksz != ext4fs_indir3_size) {
1902                         free(ext4fs_indir3_block);
1903                         ext4fs_indir3_block = NULL;
1904                         ext4fs_indir3_size = 0;
1905                         ext4fs_indir3_blkno = -1;
1906                         ext4fs_indir3_block = zalloc(blksz);
1907                         if (ext4fs_indir3_block == NULL) {
1908                                 printf("** TI ext2fs read block (indir 2 2)"
1909                                         "malloc failed. **\n");
1910                                 return -1;
1911                         }
1912                         ext4fs_indir3_size = blksz;
1913                 }
1914                 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1915                                                        /
1916                                                        perblock_child]) <<
1917                      log2_blksz) != ext4fs_indir3_blkno) {
1918                         status =
1919                             ext4fs_devread((lbaint_t)le32_to_cpu
1920                                            (ext4fs_indir2_block
1921                                             [(rblock / perblock_child)
1922                                              % (blksz / 4)]) << log2_blksz, 0,
1923                                            blksz, (char *)ext4fs_indir3_block);
1924                         if (status == 0) {
1925                                 printf("** TI ext2fs read block (indir 2 2)"
1926                                        "failed. **\n");
1927                                 return -1;
1928                         }
1929                         ext4fs_indir3_blkno =
1930                             le32_to_cpu(ext4fs_indir2_block[(rblock /
1931                                                                perblock_child) %
1932                                                               (blksz /
1933                                                                4)]) <<
1934                             log2_blksz;
1935                 }
1936
1937                 blknr = le32_to_cpu(ext4fs_indir3_block
1938                                       [rblock % perblock_child]);
1939         }
1940         debug("read_allocated_block %ld\n", blknr);
1941
1942         return blknr;
1943 }
1944
1945 /**
1946  * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1947  *                          global pointers
1948  *
1949  * This function assures that for a file with the same name but different size
1950  * the sequential store on the ext4 filesystem will be correct.
1951  *
1952  * In this function the global data, responsible for internal representation
1953  * of the ext4 data are initialized to the reset state. Without this, during
1954  * replacement of the smaller file with the bigger truncation of new file was
1955  * performed.
1956  */
1957 void ext4fs_reinit_global(void)
1958 {
1959         if (ext4fs_indir1_block != NULL) {
1960                 free(ext4fs_indir1_block);
1961                 ext4fs_indir1_block = NULL;
1962                 ext4fs_indir1_size = 0;
1963                 ext4fs_indir1_blkno = -1;
1964         }
1965         if (ext4fs_indir2_block != NULL) {
1966                 free(ext4fs_indir2_block);
1967                 ext4fs_indir2_block = NULL;
1968                 ext4fs_indir2_size = 0;
1969                 ext4fs_indir2_blkno = -1;
1970         }
1971         if (ext4fs_indir3_block != NULL) {
1972                 free(ext4fs_indir3_block);
1973                 ext4fs_indir3_block = NULL;
1974                 ext4fs_indir3_size = 0;
1975                 ext4fs_indir3_blkno = -1;
1976         }
1977 }
1978 void ext4fs_close(void)
1979 {
1980         if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
1981                 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
1982                 ext4fs_file = NULL;
1983         }
1984         if (ext4fs_root != NULL) {
1985                 free(ext4fs_root);
1986                 ext4fs_root = NULL;
1987         }
1988
1989         ext4fs_reinit_global();
1990 }
1991
1992 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
1993                                 struct ext2fs_node **fnode, int *ftype)
1994 {
1995         unsigned int fpos = 0;
1996         int status;
1997         loff_t actread;
1998         struct ext2fs_node *diro = (struct ext2fs_node *) dir;
1999
2000 #ifdef DEBUG
2001         if (name != NULL)
2002                 printf("Iterate dir %s\n", name);
2003 #endif /* of DEBUG */
2004         if (!diro->inode_read) {
2005                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2006                 if (status == 0)
2007                         return 0;
2008         }
2009         /* Search the file.  */
2010         while (fpos < le32_to_cpu(diro->inode.size)) {
2011                 struct ext2_dirent dirent;
2012
2013                 status = ext4fs_read_file(diro, fpos,
2014                                            sizeof(struct ext2_dirent),
2015                                            (char *)&dirent, &actread);
2016                 if (status < 0)
2017                         return 0;
2018
2019                 if (dirent.direntlen == 0) {
2020                         printf("Failed to iterate over directory %s\n", name);
2021                         return 0;
2022                 }
2023
2024                 if (dirent.namelen != 0) {
2025                         char filename[dirent.namelen + 1];
2026                         struct ext2fs_node *fdiro;
2027                         int type = FILETYPE_UNKNOWN;
2028
2029                         status = ext4fs_read_file(diro,
2030                                                   fpos +
2031                                                   sizeof(struct ext2_dirent),
2032                                                   dirent.namelen, filename,
2033                                                   &actread);
2034                         if (status < 0)
2035                                 return 0;
2036
2037                         fdiro = zalloc(sizeof(struct ext2fs_node));
2038                         if (!fdiro)
2039                                 return 0;
2040
2041                         fdiro->data = diro->data;
2042                         fdiro->ino = le32_to_cpu(dirent.inode);
2043
2044                         filename[dirent.namelen] = '\0';
2045
2046                         if (dirent.filetype != FILETYPE_UNKNOWN) {
2047                                 fdiro->inode_read = 0;
2048
2049                                 if (dirent.filetype == FILETYPE_DIRECTORY)
2050                                         type = FILETYPE_DIRECTORY;
2051                                 else if (dirent.filetype == FILETYPE_SYMLINK)
2052                                         type = FILETYPE_SYMLINK;
2053                                 else if (dirent.filetype == FILETYPE_REG)
2054                                         type = FILETYPE_REG;
2055                         } else {
2056                                 status = ext4fs_read_inode(diro->data,
2057                                                            le32_to_cpu
2058                                                            (dirent.inode),
2059                                                            &fdiro->inode);
2060                                 if (status == 0) {
2061                                         free(fdiro);
2062                                         return 0;
2063                                 }
2064                                 fdiro->inode_read = 1;
2065
2066                                 if ((le16_to_cpu(fdiro->inode.mode) &
2067                                      FILETYPE_INO_MASK) ==
2068                                     FILETYPE_INO_DIRECTORY) {
2069                                         type = FILETYPE_DIRECTORY;
2070                                 } else if ((le16_to_cpu(fdiro->inode.mode)
2071                                             & FILETYPE_INO_MASK) ==
2072                                            FILETYPE_INO_SYMLINK) {
2073                                         type = FILETYPE_SYMLINK;
2074                                 } else if ((le16_to_cpu(fdiro->inode.mode)
2075                                             & FILETYPE_INO_MASK) ==
2076                                            FILETYPE_INO_REG) {
2077                                         type = FILETYPE_REG;
2078                                 }
2079                         }
2080 #ifdef DEBUG
2081                         printf("iterate >%s<\n", filename);
2082 #endif /* of DEBUG */
2083                         if ((name != NULL) && (fnode != NULL)
2084                             && (ftype != NULL)) {
2085                                 if (strcmp(filename, name) == 0) {
2086                                         *ftype = type;
2087                                         *fnode = fdiro;
2088                                         return 1;
2089                                 }
2090                         } else {
2091                                 if (fdiro->inode_read == 0) {
2092                                         status = ext4fs_read_inode(diro->data,
2093                                                                  le32_to_cpu(
2094                                                                  dirent.inode),
2095                                                                  &fdiro->inode);
2096                                         if (status == 0) {
2097                                                 free(fdiro);
2098                                                 return 0;
2099                                         }
2100                                         fdiro->inode_read = 1;
2101                                 }
2102                                 switch (type) {
2103                                 case FILETYPE_DIRECTORY:
2104                                         printf("<DIR> ");
2105                                         break;
2106                                 case FILETYPE_SYMLINK:
2107                                         printf("<SYM> ");
2108                                         break;
2109                                 case FILETYPE_REG:
2110                                         printf("      ");
2111                                         break;
2112                                 default:
2113                                         printf("< ? > ");
2114                                         break;
2115                                 }
2116                                 printf("%10u %s\n",
2117                                        le32_to_cpu(fdiro->inode.size),
2118                                         filename);
2119                         }
2120                         free(fdiro);
2121                 }
2122                 fpos += le16_to_cpu(dirent.direntlen);
2123         }
2124         return 0;
2125 }
2126
2127 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2128 {
2129         char *symlink;
2130         struct ext2fs_node *diro = node;
2131         int status;
2132         loff_t actread;
2133
2134         if (!diro->inode_read) {
2135                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2136                 if (status == 0)
2137                         return NULL;
2138         }
2139         symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2140         if (!symlink)
2141                 return NULL;
2142
2143         if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2144                 strncpy(symlink, diro->inode.b.symlink,
2145                          le32_to_cpu(diro->inode.size));
2146         } else {
2147                 status = ext4fs_read_file(diro, 0,
2148                                            le32_to_cpu(diro->inode.size),
2149                                            symlink, &actread);
2150                 if ((status < 0) || (actread == 0)) {
2151                         free(symlink);
2152                         return NULL;
2153                 }
2154         }
2155         symlink[le32_to_cpu(diro->inode.size)] = '\0';
2156         return symlink;
2157 }
2158
2159 static int ext4fs_find_file1(const char *currpath,
2160                              struct ext2fs_node *currroot,
2161                              struct ext2fs_node **currfound, int *foundtype)
2162 {
2163         char fpath[strlen(currpath) + 1];
2164         char *name = fpath;
2165         char *next;
2166         int status;
2167         int type = FILETYPE_DIRECTORY;
2168         struct ext2fs_node *currnode = currroot;
2169         struct ext2fs_node *oldnode = currroot;
2170
2171         strncpy(fpath, currpath, strlen(currpath) + 1);
2172
2173         /* Remove all leading slashes. */
2174         while (*name == '/')
2175                 name++;
2176
2177         if (!*name) {
2178                 *currfound = currnode;
2179                 return 1;
2180         }
2181
2182         for (;;) {
2183                 int found;
2184
2185                 /* Extract the actual part from the pathname. */
2186                 next = strchr(name, '/');
2187                 if (next) {
2188                         /* Remove all leading slashes. */
2189                         while (*next == '/')
2190                                 *(next++) = '\0';
2191                 }
2192
2193                 if (type != FILETYPE_DIRECTORY) {
2194                         ext4fs_free_node(currnode, currroot);
2195                         return 0;
2196                 }
2197
2198                 oldnode = currnode;
2199
2200                 /* Iterate over the directory. */
2201                 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2202                 if (found == 0)
2203                         return 0;
2204
2205                 if (found == -1)
2206                         break;
2207
2208                 /* Read in the symlink and follow it. */
2209                 if (type == FILETYPE_SYMLINK) {
2210                         char *symlink;
2211
2212                         /* Test if the symlink does not loop. */
2213                         if (++symlinknest == 8) {
2214                                 ext4fs_free_node(currnode, currroot);
2215                                 ext4fs_free_node(oldnode, currroot);
2216                                 return 0;
2217                         }
2218
2219                         symlink = ext4fs_read_symlink(currnode);
2220                         ext4fs_free_node(currnode, currroot);
2221
2222                         if (!symlink) {
2223                                 ext4fs_free_node(oldnode, currroot);
2224                                 return 0;
2225                         }
2226
2227                         debug("Got symlink >%s<\n", symlink);
2228
2229                         if (symlink[0] == '/') {
2230                                 ext4fs_free_node(oldnode, currroot);
2231                                 oldnode = &ext4fs_root->diropen;
2232                         }
2233
2234                         /* Lookup the node the symlink points to. */
2235                         status = ext4fs_find_file1(symlink, oldnode,
2236                                                     &currnode, &type);
2237
2238                         free(symlink);
2239
2240                         if (status == 0) {
2241                                 ext4fs_free_node(oldnode, currroot);
2242                                 return 0;
2243                         }
2244                 }
2245
2246                 ext4fs_free_node(oldnode, currroot);
2247
2248                 /* Found the node! */
2249                 if (!next || *next == '\0') {
2250                         *currfound = currnode;
2251                         *foundtype = type;
2252                         return 1;
2253                 }
2254                 name = next;
2255         }
2256         return -1;
2257 }
2258
2259 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2260         struct ext2fs_node **foundnode, int expecttype)
2261 {
2262         int status;
2263         int foundtype = FILETYPE_DIRECTORY;
2264
2265         symlinknest = 0;
2266         if (!path)
2267                 return 0;
2268
2269         status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2270         if (status == 0)
2271                 return 0;
2272
2273         /* Check if the node that was found was of the expected type. */
2274         if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2275                 return 0;
2276         else if ((expecttype == FILETYPE_DIRECTORY)
2277                    && (foundtype != expecttype))
2278                 return 0;
2279
2280         return 1;
2281 }
2282
2283 int ext4fs_open(const char *filename, loff_t *len)
2284 {
2285         struct ext2fs_node *fdiro = NULL;
2286         int status;
2287
2288         if (ext4fs_root == NULL)
2289                 return -1;
2290
2291         ext4fs_file = NULL;
2292         status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2293                                   FILETYPE_REG);
2294         if (status == 0)
2295                 goto fail;
2296
2297         if (!fdiro->inode_read) {
2298                 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2299                                 &fdiro->inode);
2300                 if (status == 0)
2301                         goto fail;
2302         }
2303         *len = le32_to_cpu(fdiro->inode.size);
2304         ext4fs_file = fdiro;
2305
2306         return 0;
2307 fail:
2308         ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2309
2310         return -1;
2311 }
2312
2313 int ext4fs_mount(unsigned part_length)
2314 {
2315         struct ext2_data *data;
2316         int status;
2317         struct ext_filesystem *fs = get_fs();
2318         data = zalloc(SUPERBLOCK_SIZE);
2319         if (!data)
2320                 return 0;
2321
2322         /* Read the superblock. */
2323         status = ext4_read_superblock((char *)&data->sblock);
2324
2325         if (status == 0)
2326                 goto fail;
2327
2328         /* Make sure this is an ext2 filesystem. */
2329         if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2330                 goto fail;
2331
2332
2333         if (le32_to_cpu(data->sblock.revision_level) == 0) {
2334                 fs->inodesz = 128;
2335         } else {
2336                 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2337                       __le32_to_cpu(data->sblock.feature_compatibility),
2338                       __le32_to_cpu(data->sblock.feature_incompat),
2339                       __le32_to_cpu(data->sblock.feature_ro_compat));
2340
2341                 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2342                 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2343                         EXT4_FEATURE_INCOMPAT_64BIT ?
2344                         le16_to_cpu(data->sblock.descriptor_size) : 32;
2345         }
2346
2347         debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2348               le32_to_cpu(data->sblock.revision_level),
2349               fs->inodesz, fs->gdsize);
2350
2351         data->diropen.data = data;
2352         data->diropen.ino = 2;
2353         data->diropen.inode_read = 1;
2354         data->inode = &data->diropen.inode;
2355
2356         status = ext4fs_read_inode(data, 2, data->inode);
2357         if (status == 0)
2358                 goto fail;
2359
2360         ext4fs_root = data;
2361
2362         return 1;
2363 fail:
2364         printf("Failed to mount ext2 filesystem...\n");
2365         free(data);
2366         ext4fs_root = NULL;
2367
2368         return 0;
2369 }