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