fs/ext4/ext4_common.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2011 - 2012 Samsung Electronics
   4  * EXT4 filesystem implementation in Uboot by
   5  * Uma Shankar <uma.shankar@samsung.com>
   6  * Manjunatha C Achar <a.manjunatha@samsung.com>
   7  *
   8  * ext4ls and ext4load : Based on ext2 ls load support in Uboot.
   9  *
  10  * (C) Copyright 2004
  11  * esd gmbh <www.esd-electronics.com>
  12  * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
  13  *
  14  * based on code from grub2 fs/ext2.c and fs/fshelp.c by
  15  * GRUB  --  GRand Unified Bootloader
  16  * Copyright (C) 2003, 2004  Free Software Foundation, Inc.
  17  *
  18  * ext4write : Based on generic ext4 protocol.
  19  */
  20
  21 #include <common.h>
  22 #include <blk.h>
  23 #include <ext_common.h>
  24 #include <ext4fs.h>
  25 #include <malloc.h>
  26 #include <memalign.h>
  27 #include <part.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, const 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 %llu\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                                                       NULL);
 517         if (first_block_no_of_root <= 0)
 518                 goto fail;
 519
 520         status = ext4fs_devread((lbaint_t)first_block_no_of_root
 521                                 * fs->sect_perblk,
 522                                 0, fs->blksz, root_first_block_buffer);
 523         if (status == 0)
 524                 goto fail;
 525
 526         if (ext4fs_log_journal(root_first_block_buffer, first_block_no_of_root))
 527                 goto fail;
 528         dir = (struct ext2_dirent *)root_first_block_buffer;
 529         totalbytes = 0;
 530
 531         while (le16_to_cpu(dir->direntlen) > 0) {
 532                 unsigned short used_len = ROUND(dir->namelen +
 533                     sizeof(struct ext2_dirent), 4);
 534
 535                 /* last entry of block */
 536                 if (fs->blksz - totalbytes == le16_to_cpu(dir->direntlen)) {
 537
 538                         /* check if new entry fits */
 539                         if ((used_len + new_entry_byte_reqd) <=
 540                             le16_to_cpu(dir->direntlen)) {
 541                                 dir->direntlen = cpu_to_le16(used_len);
 542                                 break;
 543                         } else {
 544                                 if (blk_idx > 0) {
 545                                         printf("Block full, trying previous\n");
 546                                         blk_idx--;
 547                                         goto restart_read;
 548                                 }
 549                                 printf("All blocks full: Allocate new\n");
 550
 551                                 if (le32_to_cpu(g_parent_inode->flags) &
 552                                                 EXT4_EXTENTS_FL) {
 553                                         printf("Directory uses extents\n");
 554                                         goto fail;
 555                                 }
 556                                 if (directory_blocks >= INDIRECT_BLOCKS) {
 557                                         printf("Directory exceeds limit\n");
 558                                         goto fail;
 559                                 }
 560                                 new_blk_no = ext4fs_get_new_blk_no();
 561                                 if (new_blk_no == -1) {
 562                                         printf("no block left to assign\n");
 563                                         goto fail;
 564                                 }
 565                                 put_ext4((uint64_t)new_blk_no * fs->blksz, zero_buffer, fs->blksz);
 566                                 g_parent_inode->b.blocks.
 567                                         dir_blocks[directory_blocks] =
 568                                         cpu_to_le32(new_blk_no);
 569
 570                                 new_size = le32_to_cpu(g_parent_inode->size);
 571                                 new_size += fs->blksz;
 572                                 g_parent_inode->size = cpu_to_le32(new_size);
 573
 574                                 new_blockcnt = le32_to_cpu(g_parent_inode->blockcnt);
 575                                 new_blockcnt += fs->blksz >> LOG2_SECTOR_SIZE;
 576                                 g_parent_inode->blockcnt = cpu_to_le32(new_blockcnt);
 577
 578                                 if (ext4fs_put_metadata
 579                                     (root_first_block_buffer,
 580                                      first_block_no_of_root))
 581                                         goto fail;
 582                                 goto restart;
 583                         }
 584                 }
 585
 586                 templength = le16_to_cpu(dir->direntlen);
 587                 totalbytes = totalbytes + templength;
 588                 sizeof_void_space = check_void_in_dentry(dir, filename);
 589                 if (sizeof_void_space)
 590                         break;
 591
 592                 dir = (struct ext2_dirent *)((char *)dir + templength);
 593         }
 594
 595         /* make a pointer ready for creating next directory entry */
 596         templength = le16_to_cpu(dir->direntlen);
 597         totalbytes = totalbytes + templength;
 598         dir = (struct ext2_dirent *)((char *)dir + templength);
 599
 600         /* get the next available inode number */
 601         inodeno = ext4fs_get_new_inode_no();
 602         if (inodeno == -1) {
 603                 printf("no inode left to assign\n");
 604                 goto fail;
 605         }
 606         dir->inode = cpu_to_le32(inodeno);
 607         if (sizeof_void_space)
 608                 dir->direntlen = cpu_to_le16(sizeof_void_space);
 609         else
 610                 dir->direntlen = cpu_to_le16(fs->blksz - totalbytes);
 611
 612         dir->namelen = strlen(filename);
 613         dir->filetype = file_type;
 614         temp_dir = (char *)dir;
 615         temp_dir = temp_dir + sizeof(struct ext2_dirent);
 616         memcpy(temp_dir, filename, strlen(filename));
 617
 618         /* update or write  the 1st block of root inode */
 619         if (ext4fs_put_metadata(root_first_block_buffer,
 620                                 first_block_no_of_root))
 621                 goto fail;
 622
 623 fail:
 624         free(zero_buffer);
 625         free(root_first_block_buffer);
 626
 627         return inodeno;
 628 }
 629
 630 static int search_dir(struct ext2_inode *parent_inode, char *dirname)
 631 {
 632         int status;
 633         int inodeno = 0;
 634         int offset;
 635         int blk_idx;
 636         long int blknr;
 637         char *block_buffer = NULL;
 638         struct ext2_dirent *dir = NULL;
 639         struct ext_filesystem *fs = get_fs();
 640         uint32_t directory_blocks;
 641         char *direntname;
 642
 643         directory_blocks = le32_to_cpu(parent_inode->size) >>
 644                 LOG2_BLOCK_SIZE(ext4fs_root);
 645
 646         block_buffer = zalloc(fs->blksz);
 647         if (!block_buffer)
 648                 goto fail;
 649
 650         /* get the block no allocated to a file */
 651         for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
 652                 blknr = read_allocated_block(parent_inode, blk_idx, NULL);
 653                 if (blknr <= 0)
 654                         goto fail;
 655
 656                 /* read the directory block */
 657                 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk,
 658                                         0, fs->blksz, (char *)block_buffer);
 659                 if (status == 0)
 660                         goto fail;
 661
 662                 offset = 0;
 663                 do {
 664                         if (offset & 3) {
 665                                 printf("Badly aligned ext2_dirent\n");
 666                                 break;
 667                         }
 668
 669                         dir = (struct ext2_dirent *)(block_buffer + offset);
 670                         direntname = (char*)(dir) + sizeof(struct ext2_dirent);
 671
 672                         int direntlen = le16_to_cpu(dir->direntlen);
 673                         if (direntlen < sizeof(struct ext2_dirent))
 674                                 break;
 675
 676                         if (dir->inode && (strlen(dirname) == dir->namelen) &&
 677                             (strncmp(dirname, direntname, dir->namelen) == 0)) {
 678                                 inodeno = le32_to_cpu(dir->inode);
 679                                 break;
 680                         }
 681
 682                         offset += direntlen;
 683
 684                 } while (offset < fs->blksz);
 685
 686                 if (inodeno > 0) {
 687                         free(block_buffer);
 688                         return inodeno;
 689                 }
 690         }
 691
 692 fail:
 693         free(block_buffer);
 694
 695         return -1;
 696 }
 697
 698 static int find_dir_depth(char *dirname)
 699 {
 700         char *token = strtok(dirname, "/");
 701         int count = 0;
 702         while (token != NULL) {
 703                 token = strtok(NULL, "/");
 704                 count++;
 705         }
 706         return count + 1 + 1;
 707         /*
 708          * for example  for string /home/temp
 709          * depth=home(1)+temp(1)+1 extra for NULL;
 710          * so count is 4;
 711          */
 712 }
 713
 714 static int parse_path(char **arr, char *dirname)
 715 {
 716         char *token = strtok(dirname, "/");
 717         int i = 0;
 718
 719         /* add root */
 720         arr[i] = zalloc(strlen("/") + 1);
 721         if (!arr[i])
 722                 return -ENOMEM;
 723         memcpy(arr[i++], "/", strlen("/"));
 724
 725         /* add each path entry after root */
 726         while (token != NULL) {
 727                 arr[i] = zalloc(strlen(token) + 1);
 728                 if (!arr[i])
 729                         return -ENOMEM;
 730                 memcpy(arr[i++], token, strlen(token));
 731                 token = strtok(NULL, "/");
 732         }
 733         arr[i] = NULL;
 734
 735         return 0;
 736 }
 737
 738 int ext4fs_iget(int inode_no, struct ext2_inode *inode)
 739 {
 740         if (ext4fs_read_inode(ext4fs_root, inode_no, inode) == 0)
 741                 return -1;
 742
 743         return 0;
 744 }
 745
 746 /*
 747  * Function: ext4fs_get_parent_inode_num
 748  * Return Value: inode Number of the parent directory of  file/Directory to be
 749  * created
 750  * dirname : Input parmater, input path name of the file/directory to be created
 751  * dname : Output parameter, to be filled with the name of the directory
 752  * extracted from dirname
 753  */
 754 int ext4fs_get_parent_inode_num(const char *dirname, char *dname, int flags)
 755 {
 756         int i;
 757         int depth = 0;
 758         int matched_inode_no;
 759         int result_inode_no = -1;
 760         char **ptr = NULL;
 761         char *depth_dirname = NULL;
 762         char *parse_dirname = NULL;
 763         struct ext2_inode *parent_inode = NULL;
 764         struct ext2_inode *first_inode = NULL;
 765         struct ext2_inode temp_inode;
 766
 767         if (*dirname != '/') {
 768                 printf("Please supply Absolute path\n");
 769                 return -1;
 770         }
 771
 772         /* TODO: input validation make equivalent to linux */
 773         depth_dirname = zalloc(strlen(dirname) + 1);
 774         if (!depth_dirname)
 775                 return -ENOMEM;
 776
 777         memcpy(depth_dirname, dirname, strlen(dirname));
 778         depth = find_dir_depth(depth_dirname);
 779         parse_dirname = zalloc(strlen(dirname) + 1);
 780         if (!parse_dirname)
 781                 goto fail;
 782         memcpy(parse_dirname, dirname, strlen(dirname));
 783
 784         /* allocate memory for each directory level */
 785         ptr = zalloc((depth) * sizeof(char *));
 786         if (!ptr)
 787                 goto fail;
 788         if (parse_path(ptr, parse_dirname))
 789                 goto fail;
 790         parent_inode = zalloc(sizeof(struct ext2_inode));
 791         if (!parent_inode)
 792                 goto fail;
 793         first_inode = zalloc(sizeof(struct ext2_inode));
 794         if (!first_inode)
 795                 goto fail;
 796         memcpy(parent_inode, ext4fs_root->inode, sizeof(struct ext2_inode));
 797         memcpy(first_inode, parent_inode, sizeof(struct ext2_inode));
 798         if (flags & F_FILE)
 799                 result_inode_no = EXT2_ROOT_INO;
 800         for (i = 1; i < depth; i++) {
 801                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 802                 if (matched_inode_no == -1) {
 803                         if (ptr[i + 1] == NULL && i == 1) {
 804                                 result_inode_no = EXT2_ROOT_INO;
 805                                 goto end;
 806                         } else {
 807                                 if (ptr[i + 1] == NULL)
 808                                         break;
 809                                 printf("Invalid path\n");
 810                                 result_inode_no = -1;
 811                                 goto fail;
 812                         }
 813                 } else {
 814                         if (ptr[i + 1] != NULL) {
 815                                 memset(parent_inode, '\0',
 816                                        sizeof(struct ext2_inode));
 817                                 if (ext4fs_iget(matched_inode_no,
 818                                                 parent_inode)) {
 819                                         result_inode_no = -1;
 820                                         goto fail;
 821                                 }
 822                                 result_inode_no = matched_inode_no;
 823                         } else {
 824                                 break;
 825                         }
 826                 }
 827         }
 828
 829 end:
 830         if (i == 1)
 831                 matched_inode_no = search_dir(first_inode, ptr[i]);
 832         else
 833                 matched_inode_no = search_dir(parent_inode, ptr[i]);
 834
 835         if (matched_inode_no != -1) {
 836                 ext4fs_iget(matched_inode_no, &temp_inode);
 837                 if (le16_to_cpu(temp_inode.mode) & S_IFDIR) {
 838                         printf("It is a Directory\n");
 839                         result_inode_no = -1;
 840                         goto fail;
 841                 }
 842         }
 843
 844         if (strlen(ptr[i]) > 256) {
 845                 result_inode_no = -1;
 846                 goto fail;
 847         }
 848         memcpy(dname, ptr[i], strlen(ptr[i]));
 849
 850 fail:
 851         free(depth_dirname);
 852         free(parse_dirname);
 853         for (i = 0; i < depth; i++) {
 854                 if (!ptr[i])
 855                         break;
 856                 free(ptr[i]);
 857         }
 858         free(ptr);
 859         free(parent_inode);
 860         free(first_inode);
 861
 862         return result_inode_no;
 863 }
 864
 865 static int unlink_filename(char *filename, unsigned int blknr)
 866 {
 867         int status;
 868         int inodeno = 0;
 869         int offset;
 870         char *block_buffer = NULL;
 871         struct ext2_dirent *dir = NULL;
 872         struct ext2_dirent *previous_dir;
 873         struct ext_filesystem *fs = get_fs();
 874         int ret = -1;
 875         char *direntname;
 876
 877         block_buffer = zalloc(fs->blksz);
 878         if (!block_buffer)
 879                 return -ENOMEM;
 880
 881         /* read the directory block */
 882         status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
 883                                 fs->blksz, block_buffer);
 884         if (status == 0)
 885                 goto fail;
 886
 887         offset = 0;
 888         do {
 889                 if (offset & 3) {
 890                         printf("Badly aligned ext2_dirent\n");
 891                         break;
 892                 }
 893
 894                 previous_dir = dir;
 895                 dir = (struct ext2_dirent *)(block_buffer + offset);
 896                 direntname = (char *)(dir) + sizeof(struct ext2_dirent);
 897
 898                 int direntlen = le16_to_cpu(dir->direntlen);
 899                 if (direntlen < sizeof(struct ext2_dirent))
 900                         break;
 901
 902                 if (dir->inode && (strlen(filename) == dir->namelen) &&
 903                     (strncmp(direntname, filename, dir->namelen) == 0)) {
 904                         inodeno = le32_to_cpu(dir->inode);
 905                         break;
 906                 }
 907
 908                 offset += direntlen;
 909
 910         } while (offset < fs->blksz);
 911
 912         if (inodeno > 0) {
 913                 printf("file found, deleting\n");
 914                 if (ext4fs_log_journal(block_buffer, blknr))
 915                         goto fail;
 916
 917                 if (previous_dir) {
 918                         /* merge dir entry with predecessor */
 919                         uint16_t new_len;
 920                         new_len = le16_to_cpu(previous_dir->direntlen);
 921                         new_len += le16_to_cpu(dir->direntlen);
 922                         previous_dir->direntlen = cpu_to_le16(new_len);
 923                 } else {
 924                         /* invalidate dir entry */
 925                         dir->inode = 0;
 926                 }
 927                 if (ext4fs_put_metadata(block_buffer, blknr))
 928                         goto fail;
 929                 ret = inodeno;
 930         }
 931 fail:
 932         free(block_buffer);
 933
 934         return ret;
 935 }
 936
 937 int ext4fs_filename_unlink(char *filename)
 938 {
 939         int blk_idx;
 940         long int blknr = -1;
 941         int inodeno = -1;
 942         uint32_t directory_blocks;
 943
 944         directory_blocks = le32_to_cpu(g_parent_inode->size) >>
 945                 LOG2_BLOCK_SIZE(ext4fs_root);
 946
 947         /* read the block no allocated to a file */
 948         for (blk_idx = 0; blk_idx < directory_blocks; blk_idx++) {
 949                 blknr = read_allocated_block(g_parent_inode, blk_idx, NULL);
 950                 if (blknr <= 0)
 951                         break;
 952                 inodeno = unlink_filename(filename, blknr);
 953                 if (inodeno != -1)
 954                         return inodeno;
 955         }
 956
 957         return -1;
 958 }
 959
 960 uint32_t ext4fs_get_new_blk_no(void)
 961 {
 962         short i;
 963         short status;
 964         int remainder;
 965         unsigned int bg_idx;
 966         static int prev_bg_bitmap_index = -1;
 967         unsigned int blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 968         struct ext_filesystem *fs = get_fs();
 969         char *journal_buffer = zalloc(fs->blksz);
 970         char *zero_buffer = zalloc(fs->blksz);
 971         if (!journal_buffer || !zero_buffer)
 972                 goto fail;
 973
 974         if (fs->first_pass_bbmap == 0) {
 975                 for (i = 0; i < fs->no_blkgrp; i++) {
 976                         struct ext2_block_group *bgd = NULL;
 977                         bgd = ext4fs_get_group_descriptor(fs, i);
 978                         if (ext4fs_bg_get_free_blocks(bgd, fs)) {
 979                                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
 980                                 uint64_t b_bitmap_blk =
 981                                         ext4fs_bg_get_block_id(bgd, fs);
 982                                 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
 983                                         memcpy(fs->blk_bmaps[i], zero_buffer,
 984                                                fs->blksz);
 985                                         put_ext4(b_bitmap_blk * fs->blksz,
 986                                                  fs->blk_bmaps[i], fs->blksz);
 987                                         bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
 988                                         ext4fs_bg_set_flags(bgd, bg_flags);
 989                                 }
 990                                 fs->curr_blkno =
 991                                     _get_new_blk_no(fs->blk_bmaps[i]);
 992                                 if (fs->curr_blkno == -1)
 993                                         /* block bitmap is completely filled */
 994                                         continue;
 995                                 fs->curr_blkno = fs->curr_blkno +
 996                                                 (i * fs->blksz * 8);
 997                                 fs->first_pass_bbmap++;
 998                                 ext4fs_bg_free_blocks_dec(bgd, fs);
 999                                 ext4fs_sb_free_blocks_dec(fs->sb);
1000                                 status = ext4fs_devread(b_bitmap_blk *
1001                                                         fs->sect_perblk,
1002                                                         0, fs->blksz,
1003                                                         journal_buffer);
1004                                 if (status == 0)
1005                                         goto fail;
1006                                 if (ext4fs_log_journal(journal_buffer,
1007                                                        b_bitmap_blk))
1008                                         goto fail;
1009                                 goto success;
1010                         } else {
1011                                 debug("no space left on block group %d\n", i);
1012                         }
1013                 }
1014
1015                 goto fail;
1016         } else {
1017                 fs->curr_blkno++;
1018 restart:
1019                 /* get the blockbitmap index respective to blockno */
1020                 bg_idx = fs->curr_blkno / blk_per_grp;
1021                 if (fs->blksz == 1024) {
1022                         remainder = fs->curr_blkno % blk_per_grp;
1023                         if (!remainder)
1024                                 bg_idx--;
1025                 }
1026
1027                 /*
1028                  * To skip completely filled block group bitmaps
1029                  * Optimize the block allocation
1030                  */
1031                 if (bg_idx >= fs->no_blkgrp)
1032                         goto fail;
1033
1034                 struct ext2_block_group *bgd = NULL;
1035                 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
1036                 if (ext4fs_bg_get_free_blocks(bgd, fs) == 0) {
1037                         debug("block group %u is full. Skipping\n", bg_idx);
1038                         fs->curr_blkno = (bg_idx + 1) * blk_per_grp;
1039                         if (fs->blksz == 1024)
1040                                 fs->curr_blkno += 1;
1041                         goto restart;
1042                 }
1043
1044                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1045                 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
1046                 if (bg_flags & EXT4_BG_BLOCK_UNINIT) {
1047                         memcpy(fs->blk_bmaps[bg_idx], zero_buffer, fs->blksz);
1048                         put_ext4(b_bitmap_blk * fs->blksz,
1049                                  zero_buffer, fs->blksz);
1050                         bg_flags &= ~EXT4_BG_BLOCK_UNINIT;
1051                         ext4fs_bg_set_flags(bgd, bg_flags);
1052                 }
1053
1054                 if (ext4fs_set_block_bmap(fs->curr_blkno, fs->blk_bmaps[bg_idx],
1055                                    bg_idx) != 0) {
1056                         debug("going for restart for the block no %ld %u\n",
1057                               fs->curr_blkno, bg_idx);
1058                         fs->curr_blkno++;
1059                         goto restart;
1060                 }
1061
1062                 /* journal backup */
1063                 if (prev_bg_bitmap_index != bg_idx) {
1064                         status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
1065                                                 0, fs->blksz, journal_buffer);
1066                         if (status == 0)
1067                                 goto fail;
1068                         if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
1069                                 goto fail;
1070
1071                         prev_bg_bitmap_index = bg_idx;
1072                 }
1073                 ext4fs_bg_free_blocks_dec(bgd, fs);
1074                 ext4fs_sb_free_blocks_dec(fs->sb);
1075                 goto success;
1076         }
1077 success:
1078         free(journal_buffer);
1079         free(zero_buffer);
1080
1081         return fs->curr_blkno;
1082 fail:
1083         free(journal_buffer);
1084         free(zero_buffer);
1085
1086         return -1;
1087 }
1088
1089 int ext4fs_get_new_inode_no(void)
1090 {
1091         short i;
1092         short status;
1093         unsigned int ibmap_idx;
1094         static int prev_inode_bitmap_index = -1;
1095         unsigned int inodes_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
1096         struct ext_filesystem *fs = get_fs();
1097         char *journal_buffer = zalloc(fs->blksz);
1098         char *zero_buffer = zalloc(fs->blksz);
1099         if (!journal_buffer || !zero_buffer)
1100                 goto fail;
1101         int has_gdt_chksum = le32_to_cpu(fs->sb->feature_ro_compat) &
1102                 EXT4_FEATURE_RO_COMPAT_GDT_CSUM ? 1 : 0;
1103
1104         if (fs->first_pass_ibmap == 0) {
1105                 for (i = 0; i < fs->no_blkgrp; i++) {
1106                         uint32_t free_inodes;
1107                         struct ext2_block_group *bgd = NULL;
1108                         bgd = ext4fs_get_group_descriptor(fs, i);
1109                         free_inodes = ext4fs_bg_get_free_inodes(bgd, fs);
1110                         if (free_inodes) {
1111                                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1112                                 uint64_t i_bitmap_blk =
1113                                         ext4fs_bg_get_inode_id(bgd, fs);
1114                                 if (has_gdt_chksum)
1115                                         bgd->bg_itable_unused = free_inodes;
1116                                 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1117                                         put_ext4(i_bitmap_blk * fs->blksz,
1118                                                  zero_buffer, fs->blksz);
1119                                         bg_flags &= ~EXT4_BG_INODE_UNINIT;
1120                                         ext4fs_bg_set_flags(bgd, bg_flags);
1121                                         memcpy(fs->inode_bmaps[i],
1122                                                zero_buffer, fs->blksz);
1123                                 }
1124                                 fs->curr_inode_no =
1125                                     _get_new_inode_no(fs->inode_bmaps[i]);
1126                                 if (fs->curr_inode_no == -1)
1127                                         /* inode bitmap is completely filled */
1128                                         continue;
1129                                 fs->curr_inode_no = fs->curr_inode_no +
1130                                                         (i * inodes_per_grp);
1131                                 fs->first_pass_ibmap++;
1132                                 ext4fs_bg_free_inodes_dec(bgd, fs);
1133                                 if (has_gdt_chksum)
1134                                         ext4fs_bg_itable_unused_dec(bgd, fs);
1135                                 ext4fs_sb_free_inodes_dec(fs->sb);
1136                                 status = ext4fs_devread(i_bitmap_blk *
1137                                                         fs->sect_perblk,
1138                                                         0, fs->blksz,
1139                                                         journal_buffer);
1140                                 if (status == 0)
1141                                         goto fail;
1142                                 if (ext4fs_log_journal(journal_buffer,
1143                                                        i_bitmap_blk))
1144                                         goto fail;
1145                                 goto success;
1146                         } else
1147                                 debug("no inode left on block group %d\n", i);
1148                 }
1149                 goto fail;
1150         } else {
1151 restart:
1152                 fs->curr_inode_no++;
1153                 /* get the blockbitmap index respective to blockno */
1154                 ibmap_idx = fs->curr_inode_no / inodes_per_grp;
1155                 struct ext2_block_group *bgd =
1156                         ext4fs_get_group_descriptor(fs, ibmap_idx);
1157                 uint16_t bg_flags = ext4fs_bg_get_flags(bgd);
1158                 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
1159
1160                 if (bg_flags & EXT4_BG_INODE_UNINIT) {
1161                         put_ext4(i_bitmap_blk * fs->blksz,
1162                                  zero_buffer, fs->blksz);
1163                         bg_flags &= ~EXT4_BG_INODE_UNINIT;
1164                         ext4fs_bg_set_flags(bgd, bg_flags);
1165                         memcpy(fs->inode_bmaps[ibmap_idx], zero_buffer,
1166                                 fs->blksz);
1167                 }
1168
1169                 if (ext4fs_set_inode_bmap(fs->curr_inode_no,
1170                                           fs->inode_bmaps[ibmap_idx],
1171                                           ibmap_idx) != 0) {
1172                         debug("going for restart for the block no %d %u\n",
1173                               fs->curr_inode_no, ibmap_idx);
1174                         goto restart;
1175                 }
1176
1177                 /* journal backup */
1178                 if (prev_inode_bitmap_index != ibmap_idx) {
1179                         status = ext4fs_devread(i_bitmap_blk * fs->sect_perblk,
1180                                                 0, fs->blksz, journal_buffer);
1181                         if (status == 0)
1182                                 goto fail;
1183                         if (ext4fs_log_journal(journal_buffer,
1184                                                 le32_to_cpu(bgd->inode_id)))
1185                                 goto fail;
1186                         prev_inode_bitmap_index = ibmap_idx;
1187                 }
1188                 ext4fs_bg_free_inodes_dec(bgd, fs);
1189                 if (has_gdt_chksum)
1190                         bgd->bg_itable_unused = bgd->free_inodes;
1191                 ext4fs_sb_free_inodes_dec(fs->sb);
1192                 goto success;
1193         }
1194
1195 success:
1196         free(journal_buffer);
1197         free(zero_buffer);
1198
1199         return fs->curr_inode_no;
1200 fail:
1201         free(journal_buffer);
1202         free(zero_buffer);
1203
1204         return -1;
1205
1206 }
1207
1208
1209 static void alloc_single_indirect_block(struct ext2_inode *file_inode,
1210                                         unsigned int *total_remaining_blocks,
1211                                         unsigned int *no_blks_reqd)
1212 {
1213         short i;
1214         short status;
1215         long int actual_block_no;
1216         long int si_blockno;
1217         /* si :single indirect */
1218         __le32 *si_buffer = NULL;
1219         __le32 *si_start_addr = NULL;
1220         struct ext_filesystem *fs = get_fs();
1221
1222         if (*total_remaining_blocks != 0) {
1223                 si_buffer = zalloc(fs->blksz);
1224                 if (!si_buffer) {
1225                         printf("No Memory\n");
1226                         return;
1227                 }
1228                 si_start_addr = si_buffer;
1229                 si_blockno = ext4fs_get_new_blk_no();
1230                 if (si_blockno == -1) {
1231                         printf("no block left to assign\n");
1232                         goto fail;
1233                 }
1234                 (*no_blks_reqd)++;
1235                 debug("SIPB %ld: %u\n", si_blockno, *total_remaining_blocks);
1236
1237                 status = ext4fs_devread((lbaint_t)si_blockno * fs->sect_perblk,
1238                                         0, fs->blksz, (char *)si_buffer);
1239                 memset(si_buffer, '\0', fs->blksz);
1240                 if (status == 0)
1241                         goto fail;
1242
1243                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1244                         actual_block_no = ext4fs_get_new_blk_no();
1245                         if (actual_block_no == -1) {
1246                                 printf("no block left to assign\n");
1247                                 goto fail;
1248                         }
1249                         *si_buffer = cpu_to_le32(actual_block_no);
1250                         debug("SIAB %u: %u\n", *si_buffer,
1251                                 *total_remaining_blocks);
1252
1253                         si_buffer++;
1254                         (*total_remaining_blocks)--;
1255                         if (*total_remaining_blocks == 0)
1256                                 break;
1257                 }
1258
1259                 /* write the block to disk */
1260                 put_ext4(((uint64_t) ((uint64_t)si_blockno * (uint64_t)fs->blksz)),
1261                          si_start_addr, fs->blksz);
1262                 file_inode->b.blocks.indir_block = cpu_to_le32(si_blockno);
1263         }
1264 fail:
1265         free(si_start_addr);
1266 }
1267
1268 static void alloc_double_indirect_block(struct ext2_inode *file_inode,
1269                                         unsigned int *total_remaining_blocks,
1270                                         unsigned int *no_blks_reqd)
1271 {
1272         short i;
1273         short j;
1274         short status;
1275         long int actual_block_no;
1276         /* di:double indirect */
1277         long int di_blockno_parent;
1278         long int di_blockno_child;
1279         __le32 *di_parent_buffer = NULL;
1280         __le32 *di_child_buff = NULL;
1281         __le32 *di_block_start_addr = NULL;
1282         __le32 *di_child_buff_start = NULL;
1283         struct ext_filesystem *fs = get_fs();
1284
1285         if (*total_remaining_blocks != 0) {
1286                 /* double indirect parent block connecting to inode */
1287                 di_blockno_parent = ext4fs_get_new_blk_no();
1288                 if (di_blockno_parent == -1) {
1289                         printf("no block left to assign\n");
1290                         goto fail;
1291                 }
1292                 di_parent_buffer = zalloc(fs->blksz);
1293                 if (!di_parent_buffer)
1294                         goto fail;
1295
1296                 di_block_start_addr = di_parent_buffer;
1297                 (*no_blks_reqd)++;
1298                 debug("DIPB %ld: %u\n", di_blockno_parent,
1299                       *total_remaining_blocks);
1300
1301                 status = ext4fs_devread((lbaint_t)di_blockno_parent *
1302                                         fs->sect_perblk, 0,
1303                                         fs->blksz, (char *)di_parent_buffer);
1304
1305                 if (!status) {
1306                         printf("%s: Device read error!\n", __func__);
1307                         goto fail;
1308                 }
1309                 memset(di_parent_buffer, '\0', fs->blksz);
1310
1311                 /*
1312                  * start:for each double indirect parent
1313                  * block create one more block
1314                  */
1315                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1316                         di_blockno_child = ext4fs_get_new_blk_no();
1317                         if (di_blockno_child == -1) {
1318                                 printf("no block left to assign\n");
1319                                 goto fail;
1320                         }
1321                         di_child_buff = zalloc(fs->blksz);
1322                         if (!di_child_buff)
1323                                 goto fail;
1324
1325                         di_child_buff_start = di_child_buff;
1326                         *di_parent_buffer = cpu_to_le32(di_blockno_child);
1327                         di_parent_buffer++;
1328                         (*no_blks_reqd)++;
1329                         debug("DICB %ld: %u\n", di_blockno_child,
1330                               *total_remaining_blocks);
1331
1332                         status = ext4fs_devread((lbaint_t)di_blockno_child *
1333                                                 fs->sect_perblk, 0,
1334                                                 fs->blksz,
1335                                                 (char *)di_child_buff);
1336
1337                         if (!status) {
1338                                 printf("%s: Device read error!\n", __func__);
1339                                 goto fail;
1340                         }
1341                         memset(di_child_buff, '\0', fs->blksz);
1342                         /* filling of actual datablocks for each child */
1343                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1344                                 actual_block_no = ext4fs_get_new_blk_no();
1345                                 if (actual_block_no == -1) {
1346                                         printf("no block left to assign\n");
1347                                         goto fail;
1348                                 }
1349                                 *di_child_buff = cpu_to_le32(actual_block_no);
1350                                 debug("DIAB %ld: %u\n", actual_block_no,
1351                                       *total_remaining_blocks);
1352
1353                                 di_child_buff++;
1354                                 (*total_remaining_blocks)--;
1355                                 if (*total_remaining_blocks == 0)
1356                                         break;
1357                         }
1358                         /* write the block  table */
1359                         put_ext4(((uint64_t) ((uint64_t)di_blockno_child * (uint64_t)fs->blksz)),
1360                                  di_child_buff_start, fs->blksz);
1361                         free(di_child_buff_start);
1362                         di_child_buff_start = NULL;
1363
1364                         if (*total_remaining_blocks == 0)
1365                                 break;
1366                 }
1367                 put_ext4(((uint64_t) ((uint64_t)di_blockno_parent * (uint64_t)fs->blksz)),
1368                          di_block_start_addr, fs->blksz);
1369                 file_inode->b.blocks.double_indir_block = cpu_to_le32(di_blockno_parent);
1370         }
1371 fail:
1372         free(di_block_start_addr);
1373 }
1374
1375 static void alloc_triple_indirect_block(struct ext2_inode *file_inode,
1376                                         unsigned int *total_remaining_blocks,
1377                                         unsigned int *no_blks_reqd)
1378 {
1379         short i;
1380         short j;
1381         short k;
1382         long int actual_block_no;
1383         /* ti: Triple Indirect */
1384         long int ti_gp_blockno;
1385         long int ti_parent_blockno;
1386         long int ti_child_blockno;
1387         __le32 *ti_gp_buff = NULL;
1388         __le32 *ti_parent_buff = NULL;
1389         __le32 *ti_child_buff = NULL;
1390         __le32 *ti_gp_buff_start_addr = NULL;
1391         __le32 *ti_pbuff_start_addr = NULL;
1392         __le32 *ti_cbuff_start_addr = NULL;
1393         struct ext_filesystem *fs = get_fs();
1394         if (*total_remaining_blocks != 0) {
1395                 /* triple indirect grand parent block connecting to inode */
1396                 ti_gp_blockno = ext4fs_get_new_blk_no();
1397                 if (ti_gp_blockno == -1) {
1398                         printf("no block left to assign\n");
1399                         return;
1400                 }
1401                 ti_gp_buff = zalloc(fs->blksz);
1402                 if (!ti_gp_buff)
1403                         return;
1404
1405                 ti_gp_buff_start_addr = ti_gp_buff;
1406                 (*no_blks_reqd)++;
1407                 debug("TIGPB %ld: %u\n", ti_gp_blockno,
1408                       *total_remaining_blocks);
1409
1410                 /* for each 4 byte grand parent entry create one more block */
1411                 for (i = 0; i < (fs->blksz / sizeof(int)); i++) {
1412                         ti_parent_blockno = ext4fs_get_new_blk_no();
1413                         if (ti_parent_blockno == -1) {
1414                                 printf("no block left to assign\n");
1415                                 goto fail;
1416                         }
1417                         ti_parent_buff = zalloc(fs->blksz);
1418                         if (!ti_parent_buff)
1419                                 goto fail;
1420
1421                         ti_pbuff_start_addr = ti_parent_buff;
1422                         *ti_gp_buff = cpu_to_le32(ti_parent_blockno);
1423                         ti_gp_buff++;
1424                         (*no_blks_reqd)++;
1425                         debug("TIPB %ld: %u\n", ti_parent_blockno,
1426                               *total_remaining_blocks);
1427
1428                         /* for each 4 byte entry parent create one more block */
1429                         for (j = 0; j < (fs->blksz / sizeof(int)); j++) {
1430                                 ti_child_blockno = ext4fs_get_new_blk_no();
1431                                 if (ti_child_blockno == -1) {
1432                                         printf("no block left assign\n");
1433                                         goto fail1;
1434                                 }
1435                                 ti_child_buff = zalloc(fs->blksz);
1436                                 if (!ti_child_buff)
1437                                         goto fail1;
1438
1439                                 ti_cbuff_start_addr = ti_child_buff;
1440                                 *ti_parent_buff = cpu_to_le32(ti_child_blockno);
1441                                 ti_parent_buff++;
1442                                 (*no_blks_reqd)++;
1443                                 debug("TICB %ld: %u\n", ti_parent_blockno,
1444                                       *total_remaining_blocks);
1445
1446                                 /* fill actual datablocks for each child */
1447                                 for (k = 0; k < (fs->blksz / sizeof(int));
1448                                         k++) {
1449                                         actual_block_no =
1450                                             ext4fs_get_new_blk_no();
1451                                         if (actual_block_no == -1) {
1452                                                 printf("no block left\n");
1453                                                 free(ti_cbuff_start_addr);
1454                                                 goto fail1;
1455                                         }
1456                                         *ti_child_buff = cpu_to_le32(actual_block_no);
1457                                         debug("TIAB %ld: %u\n", actual_block_no,
1458                                               *total_remaining_blocks);
1459
1460                                         ti_child_buff++;
1461                                         (*total_remaining_blocks)--;
1462                                         if (*total_remaining_blocks == 0)
1463                                                 break;
1464                                 }
1465                                 /* write the child block */
1466                                 put_ext4(((uint64_t) ((uint64_t)ti_child_blockno *
1467                                                       (uint64_t)fs->blksz)),
1468                                          ti_cbuff_start_addr, fs->blksz);
1469                                 free(ti_cbuff_start_addr);
1470
1471                                 if (*total_remaining_blocks == 0)
1472                                         break;
1473                         }
1474                         /* write the parent block */
1475                         put_ext4(((uint64_t) ((uint64_t)ti_parent_blockno * (uint64_t)fs->blksz)),
1476                                  ti_pbuff_start_addr, fs->blksz);
1477                         free(ti_pbuff_start_addr);
1478
1479                         if (*total_remaining_blocks == 0)
1480                                 break;
1481                 }
1482                 /* write the grand parent block */
1483                 put_ext4(((uint64_t) ((uint64_t)ti_gp_blockno * (uint64_t)fs->blksz)),
1484                          ti_gp_buff_start_addr, fs->blksz);
1485                 file_inode->b.blocks.triple_indir_block = cpu_to_le32(ti_gp_blockno);
1486                 free(ti_gp_buff_start_addr);
1487                 return;
1488         }
1489 fail1:
1490         free(ti_pbuff_start_addr);
1491 fail:
1492         free(ti_gp_buff_start_addr);
1493 }
1494
1495 void ext4fs_allocate_blocks(struct ext2_inode *file_inode,
1496                                 unsigned int total_remaining_blocks,
1497                                 unsigned int *total_no_of_block)
1498 {
1499         short i;
1500         long int direct_blockno;
1501         unsigned int no_blks_reqd = 0;
1502
1503         /* allocation of direct blocks */
1504         for (i = 0; total_remaining_blocks && i < INDIRECT_BLOCKS; i++) {
1505                 direct_blockno = ext4fs_get_new_blk_no();
1506                 if (direct_blockno == -1) {
1507                         printf("no block left to assign\n");
1508                         return;
1509                 }
1510                 file_inode->b.blocks.dir_blocks[i] = cpu_to_le32(direct_blockno);
1511                 debug("DB %ld: %u\n", direct_blockno, total_remaining_blocks);
1512
1513                 total_remaining_blocks--;
1514         }
1515
1516         alloc_single_indirect_block(file_inode, &total_remaining_blocks,
1517                                     &no_blks_reqd);
1518         alloc_double_indirect_block(file_inode, &total_remaining_blocks,
1519                                     &no_blks_reqd);
1520         alloc_triple_indirect_block(file_inode, &total_remaining_blocks,
1521                                     &no_blks_reqd);
1522         *total_no_of_block += no_blks_reqd;
1523 }
1524
1525 #endif
1526
1527 static struct ext4_extent_header *ext4fs_get_extent_block
1528         (struct ext2_data *data, struct ext_block_cache *cache,
1529                 struct ext4_extent_header *ext_block,
1530                 uint32_t fileblock, int log2_blksz)
1531 {
1532         struct ext4_extent_idx *index;
1533         unsigned long long block;
1534         int blksz = EXT2_BLOCK_SIZE(data);
1535         int i;
1536
1537         while (1) {
1538                 index = (struct ext4_extent_idx *)(ext_block + 1);
1539
1540                 if (le16_to_cpu(ext_block->eh_magic) != EXT4_EXT_MAGIC)
1541                         return NULL;
1542
1543                 if (ext_block->eh_depth == 0)
1544                         return ext_block;
1545                 i = -1;
1546                 do {
1547                         i++;
1548                         if (i >= le16_to_cpu(ext_block->eh_entries))
1549                                 break;
1550                 } while (fileblock >= le32_to_cpu(index[i].ei_block));
1551
1552                 /*
1553                  * If first logical block number is higher than requested fileblock,
1554                  * it is a sparse file. This is handled on upper layer.
1555                  */
1556                 if (i > 0)
1557                         i--;
1558
1559                 block = le16_to_cpu(index[i].ei_leaf_hi);
1560                 block = (block << 32) + le32_to_cpu(index[i].ei_leaf_lo);
1561                 block <<= log2_blksz;
1562                 if (!ext_cache_read(cache, (lbaint_t)block, blksz))
1563                         return NULL;
1564                 ext_block = (struct ext4_extent_header *)cache->buf;
1565         }
1566 }
1567
1568 static int ext4fs_blockgroup
1569         (struct ext2_data *data, int group, struct ext2_block_group *blkgrp)
1570 {
1571         long int blkno;
1572         unsigned int blkoff, desc_per_blk;
1573         int log2blksz = get_fs()->dev_desc->log2blksz;
1574         int desc_size = get_fs()->gdsize;
1575
1576         if (desc_size == 0)
1577                 return 0;
1578         desc_per_blk = EXT2_BLOCK_SIZE(data) / desc_size;
1579
1580         if (desc_per_blk == 0)
1581                 return 0;
1582         blkno = le32_to_cpu(data->sblock.first_data_block) + 1 +
1583                         group / desc_per_blk;
1584         blkoff = (group % desc_per_blk) * desc_size;
1585
1586         debug("ext4fs read %d group descriptor (blkno %ld blkoff %u)\n",
1587               group, blkno, blkoff);
1588
1589         return ext4fs_devread((lbaint_t)blkno <<
1590                               (LOG2_BLOCK_SIZE(data) - log2blksz),
1591                               blkoff, desc_size, (char *)blkgrp);
1592 }
1593
1594 int ext4fs_read_inode(struct ext2_data *data, int ino, struct ext2_inode *inode)
1595 {
1596         struct ext2_block_group *blkgrp;
1597         struct ext2_sblock *sblock = &data->sblock;
1598         struct ext_filesystem *fs = get_fs();
1599         int log2blksz = get_fs()->dev_desc->log2blksz;
1600         int inodes_per_block, status;
1601         long int blkno;
1602         unsigned int blkoff;
1603
1604         /* Allocate blkgrp based on gdsize (for 64-bit support). */
1605         blkgrp = zalloc(get_fs()->gdsize);
1606         if (!blkgrp)
1607                 return 0;
1608
1609         /* It is easier to calculate if the first inode is 0. */
1610         ino--;
1611         if ( le32_to_cpu(sblock->inodes_per_group) == 0 || fs->inodesz == 0) {
1612                 free(blkgrp);
1613                 return 0;
1614         }
1615         status = ext4fs_blockgroup(data, ino / le32_to_cpu
1616                                    (sblock->inodes_per_group), blkgrp);
1617         if (status == 0) {
1618                 free(blkgrp);
1619                 return 0;
1620         }
1621
1622         inodes_per_block = EXT2_BLOCK_SIZE(data) / fs->inodesz;
1623         if ( inodes_per_block == 0 ) {
1624                 free(blkgrp);
1625                 return 0;
1626         }
1627         blkno = ext4fs_bg_get_inode_table_id(blkgrp, fs) +
1628             (ino % le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
1629         blkoff = (ino % inodes_per_block) * fs->inodesz;
1630
1631         /* Free blkgrp as it is no longer required. */
1632         free(blkgrp);
1633
1634         /* Read the inode. */
1635         status = ext4fs_devread((lbaint_t)blkno << (LOG2_BLOCK_SIZE(data) -
1636                                 log2blksz), blkoff,
1637                                 sizeof(struct ext2_inode), (char *)inode);
1638         if (status == 0)
1639                 return 0;
1640
1641         return 1;
1642 }
1643
1644 long int read_allocated_block(struct ext2_inode *inode, int fileblock,
1645                               struct ext_block_cache *cache)
1646 {
1647         long int blknr;
1648         int blksz;
1649         int log2_blksz;
1650         int status;
1651         long int rblock;
1652         long int perblock_parent;
1653         long int perblock_child;
1654         unsigned long long start;
1655         /* get the blocksize of the filesystem */
1656         blksz = EXT2_BLOCK_SIZE(ext4fs_root);
1657         log2_blksz = LOG2_BLOCK_SIZE(ext4fs_root)
1658                 - get_fs()->dev_desc->log2blksz;
1659
1660         if (le32_to_cpu(inode->flags) & EXT4_EXTENTS_FL) {
1661                 long int startblock, endblock;
1662                 struct ext_block_cache *c, cd;
1663                 struct ext4_extent_header *ext_block;
1664                 struct ext4_extent *extent;
1665                 int i;
1666
1667                 if (cache) {
1668                         c = cache;
1669                 } else {
1670                         c = &cd;
1671                         ext_cache_init(c);
1672                 }
1673                 ext_block =
1674                         ext4fs_get_extent_block(ext4fs_root, c,
1675                                                 (struct ext4_extent_header *)
1676                                                 inode->b.blocks.dir_blocks,
1677                                                 fileblock, log2_blksz);
1678                 if (!ext_block) {
1679                         printf("invalid extent block\n");
1680                         if (!cache)
1681                                 ext_cache_fini(c);
1682                         return -EINVAL;
1683                 }
1684
1685                 extent = (struct ext4_extent *)(ext_block + 1);
1686
1687                 for (i = 0; i < le16_to_cpu(ext_block->eh_entries); i++) {
1688                         startblock = le32_to_cpu(extent[i].ee_block);
1689                         endblock = startblock + le16_to_cpu(extent[i].ee_len);
1690
1691                         if (startblock > fileblock) {
1692                                 /* Sparse file */
1693                                 if (!cache)
1694                                         ext_cache_fini(c);
1695                                 return 0;
1696
1697                         } else if (fileblock < endblock) {
1698                                 start = le16_to_cpu(extent[i].ee_start_hi);
1699                                 start = (start << 32) +
1700                                         le32_to_cpu(extent[i].ee_start_lo);
1701                                 if (!cache)
1702                                         ext_cache_fini(c);
1703                                 return (fileblock - startblock) + start;
1704                         }
1705                 }
1706
1707                 if (!cache)
1708                         ext_cache_fini(c);
1709                 return 0;
1710         }
1711
1712         /* Direct blocks. */
1713         if (fileblock < INDIRECT_BLOCKS)
1714                 blknr = le32_to_cpu(inode->b.blocks.dir_blocks[fileblock]);
1715
1716         /* Indirect. */
1717         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4))) {
1718                 if (ext4fs_indir1_block == NULL) {
1719                         ext4fs_indir1_block = zalloc(blksz);
1720                         if (ext4fs_indir1_block == NULL) {
1721                                 printf("** SI ext2fs read block (indir 1)"
1722                                         "malloc failed. **\n");
1723                                 return -1;
1724                         }
1725                         ext4fs_indir1_size = blksz;
1726                         ext4fs_indir1_blkno = -1;
1727                 }
1728                 if (blksz != ext4fs_indir1_size) {
1729                         free(ext4fs_indir1_block);
1730                         ext4fs_indir1_block = NULL;
1731                         ext4fs_indir1_size = 0;
1732                         ext4fs_indir1_blkno = -1;
1733                         ext4fs_indir1_block = zalloc(blksz);
1734                         if (ext4fs_indir1_block == NULL) {
1735                                 printf("** SI ext2fs read block (indir 1):"
1736                                         "malloc failed. **\n");
1737                                 return -1;
1738                         }
1739                         ext4fs_indir1_size = blksz;
1740                 }
1741                 if ((le32_to_cpu(inode->b.blocks.indir_block) <<
1742                      log2_blksz) != ext4fs_indir1_blkno) {
1743                         status =
1744                             ext4fs_devread((lbaint_t)le32_to_cpu
1745                                            (inode->b.blocks.
1746                                             indir_block) << log2_blksz, 0,
1747                                            blksz, (char *)ext4fs_indir1_block);
1748                         if (status == 0) {
1749                                 printf("** SI ext2fs read block (indir 1)"
1750                                         "failed. **\n");
1751                                 return -1;
1752                         }
1753                         ext4fs_indir1_blkno =
1754                                 le32_to_cpu(inode->b.blocks.
1755                                                indir_block) << log2_blksz;
1756                 }
1757                 blknr = le32_to_cpu(ext4fs_indir1_block
1758                                       [fileblock - INDIRECT_BLOCKS]);
1759         }
1760         /* Double indirect. */
1761         else if (fileblock < (INDIRECT_BLOCKS + (blksz / 4 *
1762                                         (blksz / 4 + 1)))) {
1763
1764                 long int perblock = blksz / 4;
1765                 long int rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4);
1766
1767                 if (ext4fs_indir1_block == NULL) {
1768                         ext4fs_indir1_block = zalloc(blksz);
1769                         if (ext4fs_indir1_block == NULL) {
1770                                 printf("** DI ext2fs read block (indir 2 1)"
1771                                         "malloc failed. **\n");
1772                                 return -1;
1773                         }
1774                         ext4fs_indir1_size = blksz;
1775                         ext4fs_indir1_blkno = -1;
1776                 }
1777                 if (blksz != ext4fs_indir1_size) {
1778                         free(ext4fs_indir1_block);
1779                         ext4fs_indir1_block = NULL;
1780                         ext4fs_indir1_size = 0;
1781                         ext4fs_indir1_blkno = -1;
1782                         ext4fs_indir1_block = zalloc(blksz);
1783                         if (ext4fs_indir1_block == NULL) {
1784                                 printf("** DI ext2fs read block (indir 2 1)"
1785                                         "malloc failed. **\n");
1786                                 return -1;
1787                         }
1788                         ext4fs_indir1_size = blksz;
1789                 }
1790                 if ((le32_to_cpu(inode->b.blocks.double_indir_block) <<
1791                      log2_blksz) != ext4fs_indir1_blkno) {
1792                         status =
1793                             ext4fs_devread((lbaint_t)le32_to_cpu
1794                                            (inode->b.blocks.
1795                                             double_indir_block) << log2_blksz,
1796                                            0, blksz,
1797                                            (char *)ext4fs_indir1_block);
1798                         if (status == 0) {
1799                                 printf("** DI ext2fs read block (indir 2 1)"
1800                                         "failed. **\n");
1801                                 return -1;
1802                         }
1803                         ext4fs_indir1_blkno =
1804                             le32_to_cpu(inode->b.blocks.double_indir_block) <<
1805                             log2_blksz;
1806                 }
1807
1808                 if (ext4fs_indir2_block == NULL) {
1809                         ext4fs_indir2_block = zalloc(blksz);
1810                         if (ext4fs_indir2_block == NULL) {
1811                                 printf("** DI ext2fs read block (indir 2 2)"
1812                                         "malloc failed. **\n");
1813                                 return -1;
1814                         }
1815                         ext4fs_indir2_size = blksz;
1816                         ext4fs_indir2_blkno = -1;
1817                 }
1818                 if (blksz != ext4fs_indir2_size) {
1819                         free(ext4fs_indir2_block);
1820                         ext4fs_indir2_block = NULL;
1821                         ext4fs_indir2_size = 0;
1822                         ext4fs_indir2_blkno = -1;
1823                         ext4fs_indir2_block = zalloc(blksz);
1824                         if (ext4fs_indir2_block == NULL) {
1825                                 printf("** DI ext2fs read block (indir 2 2)"
1826                                         "malloc failed. **\n");
1827                                 return -1;
1828                         }
1829                         ext4fs_indir2_size = blksz;
1830                 }
1831                 if ((le32_to_cpu(ext4fs_indir1_block[rblock / perblock]) <<
1832                      log2_blksz) != ext4fs_indir2_blkno) {
1833                         status = ext4fs_devread((lbaint_t)le32_to_cpu
1834                                                 (ext4fs_indir1_block
1835                                                  [rblock /
1836                                                   perblock]) << log2_blksz, 0,
1837                                                 blksz,
1838                                                 (char *)ext4fs_indir2_block);
1839                         if (status == 0) {
1840                                 printf("** DI ext2fs read block (indir 2 2)"
1841                                         "failed. **\n");
1842                                 return -1;
1843                         }
1844                         ext4fs_indir2_blkno =
1845                             le32_to_cpu(ext4fs_indir1_block[rblock
1846                                                               /
1847                                                               perblock]) <<
1848                             log2_blksz;
1849                 }
1850                 blknr = le32_to_cpu(ext4fs_indir2_block[rblock % perblock]);
1851         }
1852         /* Tripple indirect. */
1853         else {
1854                 rblock = fileblock - (INDIRECT_BLOCKS + blksz / 4 +
1855                                       (blksz / 4 * blksz / 4));
1856                 perblock_child = blksz / 4;
1857                 perblock_parent = ((blksz / 4) * (blksz / 4));
1858
1859                 if (ext4fs_indir1_block == NULL) {
1860                         ext4fs_indir1_block = zalloc(blksz);
1861                         if (ext4fs_indir1_block == NULL) {
1862                                 printf("** TI ext2fs read block (indir 2 1)"
1863                                         "malloc failed. **\n");
1864                                 return -1;
1865                         }
1866                         ext4fs_indir1_size = blksz;
1867                         ext4fs_indir1_blkno = -1;
1868                 }
1869                 if (blksz != ext4fs_indir1_size) {
1870                         free(ext4fs_indir1_block);
1871                         ext4fs_indir1_block = NULL;
1872                         ext4fs_indir1_size = 0;
1873                         ext4fs_indir1_blkno = -1;
1874                         ext4fs_indir1_block = zalloc(blksz);
1875                         if (ext4fs_indir1_block == NULL) {
1876                                 printf("** TI ext2fs read block (indir 2 1)"
1877                                         "malloc failed. **\n");
1878                                 return -1;
1879                         }
1880                         ext4fs_indir1_size = blksz;
1881                 }
1882                 if ((le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1883                      log2_blksz) != ext4fs_indir1_blkno) {
1884                         status = ext4fs_devread
1885                             ((lbaint_t)
1886                              le32_to_cpu(inode->b.blocks.triple_indir_block)
1887                              << log2_blksz, 0, blksz,
1888                              (char *)ext4fs_indir1_block);
1889                         if (status == 0) {
1890                                 printf("** TI ext2fs read block (indir 2 1)"
1891                                         "failed. **\n");
1892                                 return -1;
1893                         }
1894                         ext4fs_indir1_blkno =
1895                             le32_to_cpu(inode->b.blocks.triple_indir_block) <<
1896                             log2_blksz;
1897                 }
1898
1899                 if (ext4fs_indir2_block == NULL) {
1900                         ext4fs_indir2_block = zalloc(blksz);
1901                         if (ext4fs_indir2_block == NULL) {
1902                                 printf("** TI ext2fs read block (indir 2 2)"
1903                                         "malloc failed. **\n");
1904                                 return -1;
1905                         }
1906                         ext4fs_indir2_size = blksz;
1907                         ext4fs_indir2_blkno = -1;
1908                 }
1909                 if (blksz != ext4fs_indir2_size) {
1910                         free(ext4fs_indir2_block);
1911                         ext4fs_indir2_block = NULL;
1912                         ext4fs_indir2_size = 0;
1913                         ext4fs_indir2_blkno = -1;
1914                         ext4fs_indir2_block = zalloc(blksz);
1915                         if (ext4fs_indir2_block == NULL) {
1916                                 printf("** TI ext2fs read block (indir 2 2)"
1917                                         "malloc failed. **\n");
1918                                 return -1;
1919                         }
1920                         ext4fs_indir2_size = blksz;
1921                 }
1922                 if ((le32_to_cpu(ext4fs_indir1_block[rblock /
1923                                                        perblock_parent]) <<
1924                      log2_blksz)
1925                     != ext4fs_indir2_blkno) {
1926                         status = ext4fs_devread((lbaint_t)le32_to_cpu
1927                                                 (ext4fs_indir1_block
1928                                                  [rblock /
1929                                                   perblock_parent]) <<
1930                                                 log2_blksz, 0, blksz,
1931                                                 (char *)ext4fs_indir2_block);
1932                         if (status == 0) {
1933                                 printf("** TI ext2fs read block (indir 2 2)"
1934                                         "failed. **\n");
1935                                 return -1;
1936                         }
1937                         ext4fs_indir2_blkno =
1938                             le32_to_cpu(ext4fs_indir1_block[rblock /
1939                                                               perblock_parent])
1940                             << log2_blksz;
1941                 }
1942
1943                 if (ext4fs_indir3_block == NULL) {
1944                         ext4fs_indir3_block = zalloc(blksz);
1945                         if (ext4fs_indir3_block == NULL) {
1946                                 printf("** TI ext2fs read block (indir 2 2)"
1947                                         "malloc failed. **\n");
1948                                 return -1;
1949                         }
1950                         ext4fs_indir3_size = blksz;
1951                         ext4fs_indir3_blkno = -1;
1952                 }
1953                 if (blksz != ext4fs_indir3_size) {
1954                         free(ext4fs_indir3_block);
1955                         ext4fs_indir3_block = NULL;
1956                         ext4fs_indir3_size = 0;
1957                         ext4fs_indir3_blkno = -1;
1958                         ext4fs_indir3_block = zalloc(blksz);
1959                         if (ext4fs_indir3_block == NULL) {
1960                                 printf("** TI ext2fs read block (indir 2 2)"
1961                                         "malloc failed. **\n");
1962                                 return -1;
1963                         }
1964                         ext4fs_indir3_size = blksz;
1965                 }
1966                 if ((le32_to_cpu(ext4fs_indir2_block[rblock
1967                                                        /
1968                                                        perblock_child]) <<
1969                      log2_blksz) != ext4fs_indir3_blkno) {
1970                         status =
1971                             ext4fs_devread((lbaint_t)le32_to_cpu
1972                                            (ext4fs_indir2_block
1973                                             [(rblock / perblock_child)
1974                                              % (blksz / 4)]) << log2_blksz, 0,
1975                                            blksz, (char *)ext4fs_indir3_block);
1976                         if (status == 0) {
1977                                 printf("** TI ext2fs read block (indir 2 2)"
1978                                        "failed. **\n");
1979                                 return -1;
1980                         }
1981                         ext4fs_indir3_blkno =
1982                             le32_to_cpu(ext4fs_indir2_block[(rblock /
1983                                                                perblock_child) %
1984                                                               (blksz /
1985                                                                4)]) <<
1986                             log2_blksz;
1987                 }
1988
1989                 blknr = le32_to_cpu(ext4fs_indir3_block
1990                                       [rblock % perblock_child]);
1991         }
1992         debug("read_allocated_block %ld\n", blknr);
1993
1994         return blknr;
1995 }
1996
1997 /**
1998  * ext4fs_reinit_global() - Reinitialize values of ext4 write implementation's
1999  *                          global pointers
2000  *
2001  * This function assures that for a file with the same name but different size
2002  * the sequential store on the ext4 filesystem will be correct.
2003  *
2004  * In this function the global data, responsible for internal representation
2005  * of the ext4 data are initialized to the reset state. Without this, during
2006  * replacement of the smaller file with the bigger truncation of new file was
2007  * performed.
2008  */
2009 void ext4fs_reinit_global(void)
2010 {
2011         if (ext4fs_indir1_block != NULL) {
2012                 free(ext4fs_indir1_block);
2013                 ext4fs_indir1_block = NULL;
2014                 ext4fs_indir1_size = 0;
2015                 ext4fs_indir1_blkno = -1;
2016         }
2017         if (ext4fs_indir2_block != NULL) {
2018                 free(ext4fs_indir2_block);
2019                 ext4fs_indir2_block = NULL;
2020                 ext4fs_indir2_size = 0;
2021                 ext4fs_indir2_blkno = -1;
2022         }
2023         if (ext4fs_indir3_block != NULL) {
2024                 free(ext4fs_indir3_block);
2025                 ext4fs_indir3_block = NULL;
2026                 ext4fs_indir3_size = 0;
2027                 ext4fs_indir3_blkno = -1;
2028         }
2029 }
2030 void ext4fs_close(void)
2031 {
2032         if ((ext4fs_file != NULL) && (ext4fs_root != NULL)) {
2033                 ext4fs_free_node(ext4fs_file, &ext4fs_root->diropen);
2034                 ext4fs_file = NULL;
2035         }
2036         if (ext4fs_root != NULL) {
2037                 free(ext4fs_root);
2038                 ext4fs_root = NULL;
2039         }
2040
2041         ext4fs_reinit_global();
2042 }
2043
2044 int ext4fs_iterate_dir(struct ext2fs_node *dir, char *name,
2045                                 struct ext2fs_node **fnode, int *ftype)
2046 {
2047         unsigned int fpos = 0;
2048         int status;
2049         loff_t actread;
2050         struct ext2fs_node *diro = (struct ext2fs_node *) dir;
2051
2052 #ifdef DEBUG
2053         if (name != NULL)
2054                 printf("Iterate dir %s\n", name);
2055 #endif /* of DEBUG */
2056         if (!diro->inode_read) {
2057                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2058                 if (status == 0)
2059                         return 0;
2060         }
2061         /* Search the file.  */
2062         while (fpos < le32_to_cpu(diro->inode.size)) {
2063                 struct ext2_dirent dirent;
2064
2065                 status = ext4fs_read_file(diro, fpos,
2066                                            sizeof(struct ext2_dirent),
2067                                            (char *)&dirent, &actread);
2068                 if (status < 0)
2069                         return 0;
2070
2071                 if (dirent.direntlen == 0) {
2072                         printf("Failed to iterate over directory %s\n", name);
2073                         return 0;
2074                 }
2075
2076                 if (dirent.namelen != 0) {
2077                         char filename[dirent.namelen + 1];
2078                         struct ext2fs_node *fdiro;
2079                         int type = FILETYPE_UNKNOWN;
2080
2081                         status = ext4fs_read_file(diro,
2082                                                   fpos +
2083                                                   sizeof(struct ext2_dirent),
2084                                                   dirent.namelen, filename,
2085                                                   &actread);
2086                         if (status < 0)
2087                                 return 0;
2088
2089                         fdiro = zalloc(sizeof(struct ext2fs_node));
2090                         if (!fdiro)
2091                                 return 0;
2092
2093                         fdiro->data = diro->data;
2094                         fdiro->ino = le32_to_cpu(dirent.inode);
2095
2096                         filename[dirent.namelen] = '\0';
2097
2098                         if (dirent.filetype != FILETYPE_UNKNOWN) {
2099                                 fdiro->inode_read = 0;
2100
2101                                 if (dirent.filetype == FILETYPE_DIRECTORY)
2102                                         type = FILETYPE_DIRECTORY;
2103                                 else if (dirent.filetype == FILETYPE_SYMLINK)
2104                                         type = FILETYPE_SYMLINK;
2105                                 else if (dirent.filetype == FILETYPE_REG)
2106                                         type = FILETYPE_REG;
2107                         } else {
2108                                 status = ext4fs_read_inode(diro->data,
2109                                                            le32_to_cpu
2110                                                            (dirent.inode),
2111                                                            &fdiro->inode);
2112                                 if (status == 0) {
2113                                         free(fdiro);
2114                                         return 0;
2115                                 }
2116                                 fdiro->inode_read = 1;
2117
2118                                 if ((le16_to_cpu(fdiro->inode.mode) &
2119                                      FILETYPE_INO_MASK) ==
2120                                     FILETYPE_INO_DIRECTORY) {
2121                                         type = FILETYPE_DIRECTORY;
2122                                 } else if ((le16_to_cpu(fdiro->inode.mode)
2123                                             & FILETYPE_INO_MASK) ==
2124                                            FILETYPE_INO_SYMLINK) {
2125                                         type = FILETYPE_SYMLINK;
2126                                 } else if ((le16_to_cpu(fdiro->inode.mode)
2127                                             & FILETYPE_INO_MASK) ==
2128                                            FILETYPE_INO_REG) {
2129                                         type = FILETYPE_REG;
2130                                 }
2131                         }
2132 #ifdef DEBUG
2133                         printf("iterate >%s<\n", filename);
2134 #endif /* of DEBUG */
2135                         if ((name != NULL) && (fnode != NULL)
2136                             && (ftype != NULL)) {
2137                                 if (strcmp(filename, name) == 0) {
2138                                         *ftype = type;
2139                                         *fnode = fdiro;
2140                                         return 1;
2141                                 }
2142                         } else {
2143                                 if (fdiro->inode_read == 0) {
2144                                         status = ext4fs_read_inode(diro->data,
2145                                                                  le32_to_cpu(
2146                                                                  dirent.inode),
2147                                                                  &fdiro->inode);
2148                                         if (status == 0) {
2149                                                 free(fdiro);
2150                                                 return 0;
2151                                         }
2152                                         fdiro->inode_read = 1;
2153                                 }
2154                                 switch (type) {
2155                                 case FILETYPE_DIRECTORY:
2156                                         printf("<DIR> ");
2157                                         break;
2158                                 case FILETYPE_SYMLINK:
2159                                         printf("<SYM> ");
2160                                         break;
2161                                 case FILETYPE_REG:
2162                                         printf("      ");
2163                                         break;
2164                                 default:
2165                                         printf("< ? > ");
2166                                         break;
2167                                 }
2168                                 printf("%10u %s\n",
2169                                        le32_to_cpu(fdiro->inode.size),
2170                                         filename);
2171                         }
2172                         free(fdiro);
2173                 }
2174                 fpos += le16_to_cpu(dirent.direntlen);
2175         }
2176         return 0;
2177 }
2178
2179 static char *ext4fs_read_symlink(struct ext2fs_node *node)
2180 {
2181         char *symlink;
2182         struct ext2fs_node *diro = node;
2183         int status;
2184         loff_t actread;
2185
2186         if (!diro->inode_read) {
2187                 status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode);
2188                 if (status == 0)
2189                         return NULL;
2190         }
2191         symlink = zalloc(le32_to_cpu(diro->inode.size) + 1);
2192         if (!symlink)
2193                 return NULL;
2194
2195         if (le32_to_cpu(diro->inode.size) < sizeof(diro->inode.b.symlink)) {
2196                 strncpy(symlink, diro->inode.b.symlink,
2197                          le32_to_cpu(diro->inode.size));
2198         } else {
2199                 status = ext4fs_read_file(diro, 0,
2200                                            le32_to_cpu(diro->inode.size),
2201                                            symlink, &actread);
2202                 if ((status < 0) || (actread == 0)) {
2203                         free(symlink);
2204                         return NULL;
2205                 }
2206         }
2207         symlink[le32_to_cpu(diro->inode.size)] = '\0';
2208         return symlink;
2209 }
2210
2211 static int ext4fs_find_file1(const char *currpath,
2212                              struct ext2fs_node *currroot,
2213                              struct ext2fs_node **currfound, int *foundtype)
2214 {
2215         char fpath[strlen(currpath) + 1];
2216         char *name = fpath;
2217         char *next;
2218         int status;
2219         int type = FILETYPE_DIRECTORY;
2220         struct ext2fs_node *currnode = currroot;
2221         struct ext2fs_node *oldnode = currroot;
2222
2223         strncpy(fpath, currpath, strlen(currpath) + 1);
2224
2225         /* Remove all leading slashes. */
2226         while (*name == '/')
2227                 name++;
2228
2229         if (!*name) {
2230                 *currfound = currnode;
2231                 return 1;
2232         }
2233
2234         for (;;) {
2235                 int found;
2236
2237                 /* Extract the actual part from the pathname. */
2238                 next = strchr(name, '/');
2239                 if (next) {
2240                         /* Remove all leading slashes. */
2241                         while (*next == '/')
2242                                 *(next++) = '\0';
2243                 }
2244
2245                 if (type != FILETYPE_DIRECTORY) {
2246                         ext4fs_free_node(currnode, currroot);
2247                         return 0;
2248                 }
2249
2250                 oldnode = currnode;
2251
2252                 /* Iterate over the directory. */
2253                 found = ext4fs_iterate_dir(currnode, name, &currnode, &type);
2254                 if (found == 0)
2255                         return 0;
2256
2257                 if (found == -1)
2258                         break;
2259
2260                 /* Read in the symlink and follow it. */
2261                 if (type == FILETYPE_SYMLINK) {
2262                         char *symlink;
2263
2264                         /* Test if the symlink does not loop. */
2265                         if (++symlinknest == 8) {
2266                                 ext4fs_free_node(currnode, currroot);
2267                                 ext4fs_free_node(oldnode, currroot);
2268                                 return 0;
2269                         }
2270
2271                         symlink = ext4fs_read_symlink(currnode);
2272                         ext4fs_free_node(currnode, currroot);
2273
2274                         if (!symlink) {
2275                                 ext4fs_free_node(oldnode, currroot);
2276                                 return 0;
2277                         }
2278
2279                         debug("Got symlink >%s<\n", symlink);
2280
2281                         if (symlink[0] == '/') {
2282                                 ext4fs_free_node(oldnode, currroot);
2283                                 oldnode = &ext4fs_root->diropen;
2284                         }
2285
2286                         /* Lookup the node the symlink points to. */
2287                         status = ext4fs_find_file1(symlink, oldnode,
2288                                                     &currnode, &type);
2289
2290                         free(symlink);
2291
2292                         if (status == 0) {
2293                                 ext4fs_free_node(oldnode, currroot);
2294                                 return 0;
2295                         }
2296                 }
2297
2298                 ext4fs_free_node(oldnode, currroot);
2299
2300                 /* Found the node! */
2301                 if (!next || *next == '\0') {
2302                         *currfound = currnode;
2303                         *foundtype = type;
2304                         return 1;
2305                 }
2306                 name = next;
2307         }
2308         return -1;
2309 }
2310
2311 int ext4fs_find_file(const char *path, struct ext2fs_node *rootnode,
2312         struct ext2fs_node **foundnode, int expecttype)
2313 {
2314         int status;
2315         int foundtype = FILETYPE_DIRECTORY;
2316
2317         symlinknest = 0;
2318         if (!path)
2319                 return 0;
2320
2321         status = ext4fs_find_file1(path, rootnode, foundnode, &foundtype);
2322         if (status == 0)
2323                 return 0;
2324
2325         /* Check if the node that was found was of the expected type. */
2326         if ((expecttype == FILETYPE_REG) && (foundtype != expecttype))
2327                 return 0;
2328         else if ((expecttype == FILETYPE_DIRECTORY)
2329                    && (foundtype != expecttype))
2330                 return 0;
2331
2332         return 1;
2333 }
2334
2335 int ext4fs_open(const char *filename, loff_t *len)
2336 {
2337         struct ext2fs_node *fdiro = NULL;
2338         int status;
2339
2340         if (ext4fs_root == NULL)
2341                 return -1;
2342
2343         ext4fs_file = NULL;
2344         status = ext4fs_find_file(filename, &ext4fs_root->diropen, &fdiro,
2345                                   FILETYPE_REG);
2346         if (status == 0)
2347                 goto fail;
2348
2349         if (!fdiro->inode_read) {
2350                 status = ext4fs_read_inode(fdiro->data, fdiro->ino,
2351                                 &fdiro->inode);
2352                 if (status == 0)
2353                         goto fail;
2354         }
2355         *len = le32_to_cpu(fdiro->inode.size);
2356         ext4fs_file = fdiro;
2357
2358         return 0;
2359 fail:
2360         ext4fs_free_node(fdiro, &ext4fs_root->diropen);
2361
2362         return -1;
2363 }
2364
2365 int ext4fs_mount(unsigned part_length)
2366 {
2367         struct ext2_data *data;
2368         int status;
2369         struct ext_filesystem *fs = get_fs();
2370         data = zalloc(SUPERBLOCK_SIZE);
2371         if (!data)
2372                 return 0;
2373
2374         /* Read the superblock. */
2375         status = ext4_read_superblock((char *)&data->sblock);
2376
2377         if (status == 0)
2378                 goto fail;
2379
2380         /* Make sure this is an ext2 filesystem. */
2381         if (le16_to_cpu(data->sblock.magic) != EXT2_MAGIC)
2382                 goto fail_noerr;
2383
2384
2385         if (le32_to_cpu(data->sblock.revision_level) == 0) {
2386                 fs->inodesz = 128;
2387                 fs->gdsize = 32;
2388         } else {
2389                 debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n",
2390                       __le32_to_cpu(data->sblock.feature_compatibility),
2391                       __le32_to_cpu(data->sblock.feature_incompat),
2392                       __le32_to_cpu(data->sblock.feature_ro_compat));
2393
2394                 fs->inodesz = le16_to_cpu(data->sblock.inode_size);
2395                 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2396                         EXT4_FEATURE_INCOMPAT_64BIT ?
2397                         le16_to_cpu(data->sblock.descriptor_size) : 32;
2398         }
2399
2400         debug("EXT2 rev %d, inode_size %d, descriptor size %d\n",
2401               le32_to_cpu(data->sblock.revision_level),
2402               fs->inodesz, fs->gdsize);
2403
2404         data->diropen.data = data;
2405         data->diropen.ino = 2;
2406         data->diropen.inode_read = 1;
2407         data->inode = &data->diropen.inode;
2408
2409         status = ext4fs_read_inode(data, 2, data->inode);
2410         if (status == 0)
2411                 goto fail;
2412
2413         ext4fs_root = data;
2414
2415         return 1;
2416 fail:
2417         printf("Failed to mount ext2 filesystem...\n");
2418 fail_noerr:
2419         free(data);
2420         ext4fs_root = NULL;
2421
2422         return 0;
2423 }