git.sur5r.net Git - u-boot/blob - fs/ext4/ext4_write.c

   1 /*
   2  * (C) Copyright 2011 - 2012 Samsung Electronics
   3  * EXT4 filesystem implementation in Uboot by
   4  * Uma Shankar <uma.shankar@samsung.com>
   5  * Manjunatha C Achar <a.manjunatha@samsung.com>
   6  *
   7  * ext4ls and ext4load : Based on ext2 ls and load support in Uboot.
   8  *                     Ext4 read optimization taken from Open-Moko
   9  *                     Qi bootloader
  10  *
  11  * (C) Copyright 2004
  12  * esd gmbh <www.esd-electronics.com>
  13  * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
  14  *
  15  * based on code from grub2 fs/ext2.c and fs/fshelp.c by
  16  * GRUB  --  GRand Unified Bootloader
  17  * Copyright (C) 2003, 2004  Free Software Foundation, Inc.
  18  *
  19  * ext4write : Based on generic ext4 protocol.
  20  *
  21  * SPDX-License-Identifier:     GPL-2.0+
  22  */
  23
  24
  25 #include <common.h>
  26 #include <memalign.h>
  27 #include <linux/stat.h>
  28 #include <div64.h>
  29 #include "ext4_common.h"
  30
  31 static inline void ext4fs_sb_free_inodes_inc(struct ext2_sblock *sb)
  32 {
  33         sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) + 1);
  34 }
  35
  36 static inline void ext4fs_sb_free_blocks_inc(struct ext2_sblock *sb)
  37 {
  38         sb->free_blocks = cpu_to_le32(le32_to_cpu(sb->free_blocks) + 1);
  39 }
  40
  41 static inline void ext4fs_bg_free_inodes_inc(struct ext2_block_group *bg)
  42 {
  43         bg->free_inodes = cpu_to_le16(le16_to_cpu(bg->free_inodes) + 1);
  44 }
  45
  46 static inline void ext4fs_bg_free_blocks_inc(struct ext2_block_group *bg)
  47 {
  48         bg->free_blocks = cpu_to_le16(le16_to_cpu(bg->free_blocks) + 1);
  49 }
  50
  51 static void ext4fs_update(void)
  52 {
  53         short i;
  54         ext4fs_update_journal();
  55         struct ext_filesystem *fs = get_fs();
  56
  57         /* update  super block */
  58         put_ext4((uint64_t)(SUPERBLOCK_SIZE),
  59                  (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
  60
  61         /* update block groups */
  62         for (i = 0; i < fs->no_blkgrp; i++) {
  63                 fs->bgd[i].bg_checksum = cpu_to_le16(ext4fs_checksum_update(i));
  64                 put_ext4((uint64_t)le32_to_cpu(fs->bgd[i].block_id) * fs->blksz,
  65                          fs->blk_bmaps[i], fs->blksz);
  66         }
  67
  68         /* update inode table groups */
  69         for (i = 0; i < fs->no_blkgrp; i++) {
  70                 put_ext4((uint64_t)le32_to_cpu(fs->bgd[i].inode_id) * fs->blksz,
  71                          fs->inode_bmaps[i], fs->blksz);
  72         }
  73
  74         /* update the block group descriptor table */
  75         put_ext4((uint64_t)((uint64_t)fs->gdtable_blkno * (uint64_t)fs->blksz),
  76                  (struct ext2_block_group *)fs->gdtable,
  77                  (fs->blksz * fs->no_blk_pergdt));
  78
  79         ext4fs_dump_metadata();
  80
  81         gindex = 0;
  82         gd_index = 0;
  83 }
  84
  85 int ext4fs_get_bgdtable(void)
  86 {
  87         int status;
  88         int grp_desc_size;
  89         struct ext_filesystem *fs = get_fs();
  90         grp_desc_size = sizeof(struct ext2_block_group);
  91         fs->no_blk_pergdt = (fs->no_blkgrp * grp_desc_size) / fs->blksz;
  92         if ((fs->no_blkgrp * grp_desc_size) % fs->blksz)
  93                 fs->no_blk_pergdt++;
  94
  95         /* allocate memory for gdtable */
  96         fs->gdtable = zalloc(fs->blksz * fs->no_blk_pergdt);
  97         if (!fs->gdtable)
  98                 return -ENOMEM;
  99         /* read the group descriptor table */
 100         status = ext4fs_devread((lbaint_t)fs->gdtable_blkno * fs->sect_perblk,
 101                                 0, fs->blksz * fs->no_blk_pergdt, fs->gdtable);
 102         if (status == 0)
 103                 goto fail;
 104
 105         if (ext4fs_log_gdt(fs->gdtable)) {
 106                 printf("Error in ext4fs_log_gdt\n");
 107                 return -1;
 108         }
 109
 110         return 0;
 111 fail:
 112         free(fs->gdtable);
 113         fs->gdtable = NULL;
 114
 115         return -1;
 116 }
 117
 118 static void delete_single_indirect_block(struct ext2_inode *inode)
 119 {
 120         struct ext2_block_group *bgd = NULL;
 121         static int prev_bg_bmap_idx = -1;
 122         uint32_t blknr;
 123         int remainder;
 124         int bg_idx;
 125         int status;
 126         uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 127         struct ext_filesystem *fs = get_fs();
 128         char *journal_buffer = zalloc(fs->blksz);
 129         if (!journal_buffer) {
 130                 printf("No memory\n");
 131                 return;
 132         }
 133         /* get  block group descriptor table */
 134         bgd = (struct ext2_block_group *)fs->gdtable;
 135
 136         /* deleting the single indirect block associated with inode */
 137         if (inode->b.blocks.indir_block != 0) {
 138                 blknr = le32_to_cpu(inode->b.blocks.indir_block);
 139                 debug("SIPB releasing %u\n", blknr);
 140                 bg_idx = blknr / blk_per_grp;
 141                 if (fs->blksz == 1024) {
 142                         remainder = blknr % blk_per_grp;
 143                         if (!remainder)
 144                                 bg_idx--;
 145                 }
 146                 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
 147                 ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 148                 ext4fs_sb_free_blocks_inc(fs->sb);
 149                 /* journal backup */
 150                 if (prev_bg_bmap_idx != bg_idx) {
 151                         status = ext4fs_devread(
 152                                            (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) *
 153                                            fs->sect_perblk, 0, fs->blksz,
 154                                            journal_buffer);
 155                         if (status == 0)
 156                                 goto fail;
 157                         if (ext4fs_log_journal
 158                             (journal_buffer, le32_to_cpu(bgd[bg_idx].block_id)))
 159                                 goto fail;
 160                         prev_bg_bmap_idx = bg_idx;
 161                 }
 162         }
 163 fail:
 164         free(journal_buffer);
 165 }
 166
 167 static void delete_double_indirect_block(struct ext2_inode *inode)
 168 {
 169         int i;
 170         short status;
 171         static int prev_bg_bmap_idx = -1;
 172         uint32_t blknr;
 173         int remainder;
 174         int bg_idx;
 175         uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 176         __le32 *di_buffer = NULL;
 177         void *dib_start_addr = NULL;
 178         struct ext2_block_group *bgd = NULL;
 179         struct ext_filesystem *fs = get_fs();
 180         char *journal_buffer = zalloc(fs->blksz);
 181         if (!journal_buffer) {
 182                 printf("No memory\n");
 183                 return;
 184         }
 185         /* get the block group descriptor table */
 186         bgd = (struct ext2_block_group *)fs->gdtable;
 187
 188         if (inode->b.blocks.double_indir_block != 0) {
 189                 di_buffer = zalloc(fs->blksz);
 190                 if (!di_buffer) {
 191                         printf("No memory\n");
 192                         return;
 193                 }
 194                 dib_start_addr = di_buffer;
 195                 blknr = le32_to_cpu(inode->b.blocks.double_indir_block);
 196                 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
 197                                         fs->blksz, (char *)di_buffer);
 198                 for (i = 0; i < fs->blksz / sizeof(int); i++) {
 199                         if (*di_buffer == 0)
 200                                 break;
 201
 202                         debug("DICB releasing %u\n", *di_buffer);
 203                         bg_idx = le32_to_cpu(*di_buffer) / blk_per_grp;
 204                         if (fs->blksz == 1024) {
 205                                 remainder = le32_to_cpu(*di_buffer) % blk_per_grp;
 206                                 if (!remainder)
 207                                         bg_idx--;
 208                         }
 209                         ext4fs_reset_block_bmap(le32_to_cpu(*di_buffer),
 210                                         fs->blk_bmaps[bg_idx], bg_idx);
 211                         di_buffer++;
 212                         ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 213                         ext4fs_sb_free_blocks_inc(fs->sb);
 214                         /* journal backup */
 215                         if (prev_bg_bmap_idx != bg_idx) {
 216                                 status = ext4fs_devread(
 217                                                         (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id)
 218                                                         * fs->sect_perblk, 0,
 219                                                         fs->blksz,
 220                                                         journal_buffer);
 221                                 if (status == 0)
 222                                         goto fail;
 223
 224                                 if (ext4fs_log_journal(journal_buffer,
 225                                                         le32_to_cpu(bgd[bg_idx].block_id)))
 226                                         goto fail;
 227                                 prev_bg_bmap_idx = bg_idx;
 228                         }
 229                 }
 230
 231                 /* removing the parent double indirect block */
 232                 blknr = le32_to_cpu(inode->b.blocks.double_indir_block);
 233                 bg_idx = blknr / blk_per_grp;
 234                 if (fs->blksz == 1024) {
 235                         remainder = blknr % blk_per_grp;
 236                         if (!remainder)
 237                                 bg_idx--;
 238                 }
 239                 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
 240                 ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 241                 ext4fs_sb_free_blocks_inc(fs->sb);
 242                 /* journal backup */
 243                 if (prev_bg_bmap_idx != bg_idx) {
 244                         memset(journal_buffer, '\0', fs->blksz);
 245                         status = ext4fs_devread((lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) *
 246                                                 fs->sect_perblk, 0, fs->blksz,
 247                                                 journal_buffer);
 248                         if (status == 0)
 249                                 goto fail;
 250
 251                         if (ext4fs_log_journal(journal_buffer,
 252                                                 le32_to_cpu(bgd[bg_idx].block_id)))
 253                                 goto fail;
 254                         prev_bg_bmap_idx = bg_idx;
 255                 }
 256                 debug("DIPB releasing %d\n", blknr);
 257         }
 258 fail:
 259         free(dib_start_addr);
 260         free(journal_buffer);
 261 }
 262
 263 static void delete_triple_indirect_block(struct ext2_inode *inode)
 264 {
 265         int i, j;
 266         short status;
 267         static int prev_bg_bmap_idx = -1;
 268         uint32_t blknr;
 269         int remainder;
 270         int bg_idx;
 271         uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 272         __le32 *tigp_buffer = NULL;
 273         void *tib_start_addr = NULL;
 274         __le32 *tip_buffer = NULL;
 275         void *tipb_start_addr = NULL;
 276         struct ext2_block_group *bgd = NULL;
 277         struct ext_filesystem *fs = get_fs();
 278         char *journal_buffer = zalloc(fs->blksz);
 279         if (!journal_buffer) {
 280                 printf("No memory\n");
 281                 return;
 282         }
 283         /* get block group descriptor table */
 284         bgd = (struct ext2_block_group *)fs->gdtable;
 285
 286         if (inode->b.blocks.triple_indir_block != 0) {
 287                 tigp_buffer = zalloc(fs->blksz);
 288                 if (!tigp_buffer) {
 289                         printf("No memory\n");
 290                         return;
 291                 }
 292                 tib_start_addr = tigp_buffer;
 293                 blknr = le32_to_cpu(inode->b.blocks.triple_indir_block);
 294                 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
 295                                         fs->blksz, (char *)tigp_buffer);
 296                 for (i = 0; i < fs->blksz / sizeof(int); i++) {
 297                         if (*tigp_buffer == 0)
 298                                 break;
 299                         debug("tigp buffer releasing %u\n", *tigp_buffer);
 300
 301                         tip_buffer = zalloc(fs->blksz);
 302                         if (!tip_buffer)
 303                                 goto fail;
 304                         tipb_start_addr = tip_buffer;
 305                         status = ext4fs_devread((lbaint_t)le32_to_cpu(*tigp_buffer) *
 306                                                 fs->sect_perblk, 0, fs->blksz,
 307                                                 (char *)tip_buffer);
 308                         for (j = 0; j < fs->blksz / sizeof(int); j++) {
 309                                 if (le32_to_cpu(*tip_buffer) == 0)
 310                                         break;
 311                                 bg_idx = le32_to_cpu(*tip_buffer) / blk_per_grp;
 312                                 if (fs->blksz == 1024) {
 313                                         remainder = le32_to_cpu(*tip_buffer) % blk_per_grp;
 314                                         if (!remainder)
 315                                                 bg_idx--;
 316                                 }
 317
 318                                 ext4fs_reset_block_bmap(le32_to_cpu(*tip_buffer),
 319                                                         fs->blk_bmaps[bg_idx],
 320                                                         bg_idx);
 321
 322                                 tip_buffer++;
 323                                 ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 324                                 ext4fs_sb_free_blocks_inc(fs->sb);
 325                                 /* journal backup */
 326                                 if (prev_bg_bmap_idx != bg_idx) {
 327                                         status =
 328                                             ext4fs_devread(
 329                                                         (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) *
 330                                                         fs->sect_perblk, 0,
 331                                                         fs->blksz,
 332                                                         journal_buffer);
 333                                         if (status == 0)
 334                                                 goto fail;
 335
 336                                         if (ext4fs_log_journal(journal_buffer,
 337                                                                le32_to_cpu(bgd[bg_idx].block_id)))
 338                                                 goto fail;
 339                                         prev_bg_bmap_idx = bg_idx;
 340                                 }
 341                         }
 342                         free(tipb_start_addr);
 343                         tipb_start_addr = NULL;
 344
 345                         /*
 346                          * removing the grand parent blocks
 347                          * which is connected to inode
 348                          */
 349                         bg_idx = le32_to_cpu(*tigp_buffer) / blk_per_grp;
 350                         if (fs->blksz == 1024) {
 351                                 remainder = le32_to_cpu(*tigp_buffer) % blk_per_grp;
 352                                 if (!remainder)
 353                                         bg_idx--;
 354                         }
 355                         ext4fs_reset_block_bmap(le32_to_cpu(*tigp_buffer),
 356                                                 fs->blk_bmaps[bg_idx], bg_idx);
 357
 358                         tigp_buffer++;
 359                         ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 360                         ext4fs_sb_free_blocks_inc(fs->sb);
 361                         /* journal backup */
 362                         if (prev_bg_bmap_idx != bg_idx) {
 363                                 memset(journal_buffer, '\0', fs->blksz);
 364                                 status =
 365                                     ext4fs_devread(
 366                                                    (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) *
 367                                                    fs->sect_perblk, 0,
 368                                                    fs->blksz, journal_buffer);
 369                                 if (status == 0)
 370                                         goto fail;
 371
 372                                 if (ext4fs_log_journal(journal_buffer,
 373                                                         le32_to_cpu(bgd[bg_idx].block_id)))
 374                                         goto fail;
 375                                 prev_bg_bmap_idx = bg_idx;
 376                         }
 377                 }
 378
 379                 /* removing the grand parent triple indirect block */
 380                 blknr = le32_to_cpu(inode->b.blocks.triple_indir_block);
 381                 bg_idx = blknr / blk_per_grp;
 382                 if (fs->blksz == 1024) {
 383                         remainder = blknr % blk_per_grp;
 384                         if (!remainder)
 385                                 bg_idx--;
 386                 }
 387                 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
 388                 ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 389                 ext4fs_sb_free_blocks_inc(fs->sb);
 390                 /* journal backup */
 391                 if (prev_bg_bmap_idx != bg_idx) {
 392                         memset(journal_buffer, '\0', fs->blksz);
 393                         status = ext4fs_devread(
 394                                                 (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) *
 395                                                 fs->sect_perblk, 0, fs->blksz,
 396                                                 journal_buffer);
 397                         if (status == 0)
 398                                 goto fail;
 399
 400                         if (ext4fs_log_journal(journal_buffer,
 401                                                 le32_to_cpu(bgd[bg_idx].block_id)))
 402                                 goto fail;
 403                         prev_bg_bmap_idx = bg_idx;
 404                 }
 405                 debug("tigp buffer itself releasing %d\n", blknr);
 406         }
 407 fail:
 408         free(tib_start_addr);
 409         free(tipb_start_addr);
 410         free(journal_buffer);
 411 }
 412
 413 static int ext4fs_delete_file(int inodeno)
 414 {
 415         struct ext2_inode inode;
 416         short status;
 417         int i;
 418         int remainder;
 419         long int blknr;
 420         int bg_idx;
 421         int ibmap_idx;
 422         char *read_buffer = NULL;
 423         char *start_block_address = NULL;
 424         uint32_t no_blocks;
 425
 426         static int prev_bg_bmap_idx = -1;
 427         unsigned int inodes_per_block;
 428         uint32_t blkno;
 429         unsigned int blkoff;
 430         uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 431         uint32_t inode_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
 432         struct ext2_inode *inode_buffer = NULL;
 433         struct ext2_block_group *bgd = NULL;
 434         struct ext_filesystem *fs = get_fs();
 435         char *journal_buffer = zalloc(fs->blksz);
 436         if (!journal_buffer)
 437                 return -ENOMEM;
 438         /* get the block group descriptor table */
 439         bgd = (struct ext2_block_group *)fs->gdtable;
 440         status = ext4fs_read_inode(ext4fs_root, inodeno, &inode);
 441         if (status == 0)
 442                 goto fail;
 443
 444         /* read the block no allocated to a file */
 445         no_blocks = le32_to_cpu(inode.size) / fs->blksz;
 446         if (le32_to_cpu(inode.size) % fs->blksz)
 447                 no_blocks++;
 448
 449         if (le32_to_cpu(inode.flags) & EXT4_EXTENTS_FL) {
 450                 /* FIXME delete extent index blocks, i.e. eh_depth >= 1 */
 451                 struct ext4_extent_header *eh =
 452                         (struct ext4_extent_header *)
 453                                 inode.b.blocks.dir_blocks;
 454                 debug("del: dep=%d entries=%d\n", eh->eh_depth, eh->eh_entries);
 455         } else {
 456                 delete_single_indirect_block(&inode);
 457                 delete_double_indirect_block(&inode);
 458                 delete_triple_indirect_block(&inode);
 459         }
 460
 461         /* release data blocks */
 462         for (i = 0; i < no_blocks; i++) {
 463                 blknr = read_allocated_block(&inode, i);
 464                 bg_idx = blknr / blk_per_grp;
 465                 if (fs->blksz == 1024) {
 466                         remainder = blknr % blk_per_grp;
 467                         if (!remainder)
 468                                 bg_idx--;
 469                 }
 470                 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx],
 471                                         bg_idx);
 472                 debug("EXT4 Block releasing %ld: %d\n", blknr, bg_idx);
 473
 474                 ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 475                 ext4fs_sb_free_blocks_inc(fs->sb);
 476                 /* journal backup */
 477                 if (prev_bg_bmap_idx != bg_idx) {
 478                         uint32_t bgd_blknr = le32_to_cpu(bgd[bg_idx].block_id);
 479                         status = ext4fs_devread((lbaint_t)bgd_blknr *
 480                                                 fs->sect_perblk,
 481                                                 0, fs->blksz,
 482                                                 journal_buffer);
 483                         if (status == 0)
 484                                 goto fail;
 485                         if (ext4fs_log_journal(journal_buffer, bgd_blknr))
 486                                 goto fail;
 487                         prev_bg_bmap_idx = bg_idx;
 488                 }
 489         }
 490
 491         /* release inode */
 492         /* from the inode no to blockno */
 493         inodes_per_block = fs->blksz / fs->inodesz;
 494         ibmap_idx = inodeno / inode_per_grp;
 495
 496         /* get the block no */
 497         inodeno--;
 498         blkno = le32_to_cpu(bgd[ibmap_idx].inode_table_id) +
 499                 (inodeno % inode_per_grp) / inodes_per_block;
 500
 501         /* get the offset of the inode */
 502         blkoff = ((inodeno) % inodes_per_block) * fs->inodesz;
 503
 504         /* read the block no containing the inode */
 505         read_buffer = zalloc(fs->blksz);
 506         if (!read_buffer)
 507                 goto fail;
 508         start_block_address = read_buffer;
 509         status = ext4fs_devread((lbaint_t)blkno * fs->sect_perblk,
 510                                 0, fs->blksz, read_buffer);
 511         if (status == 0)
 512                 goto fail;
 513
 514         if (ext4fs_log_journal(read_buffer, blkno))
 515                 goto fail;
 516
 517         read_buffer = read_buffer + blkoff;
 518         inode_buffer = (struct ext2_inode *)read_buffer;
 519         memset(inode_buffer, '\0', fs->inodesz);
 520
 521         /* write the inode to original position in inode table */
 522         if (ext4fs_put_metadata(start_block_address, blkno))
 523                 goto fail;
 524
 525         /* update the respective inode bitmaps */
 526         inodeno++;
 527         ext4fs_reset_inode_bmap(inodeno, fs->inode_bmaps[ibmap_idx], ibmap_idx);
 528         ext4fs_bg_free_inodes_inc(&bgd[ibmap_idx]);
 529         ext4fs_sb_free_inodes_inc(fs->sb);
 530         /* journal backup */
 531         memset(journal_buffer, '\0', fs->blksz);
 532         status = ext4fs_devread((lbaint_t)le32_to_cpu(bgd[ibmap_idx].inode_id) *
 533                                 fs->sect_perblk, 0, fs->blksz, journal_buffer);
 534         if (status == 0)
 535                 goto fail;
 536         if (ext4fs_log_journal(journal_buffer, le32_to_cpu(bgd[ibmap_idx].inode_id)))
 537                 goto fail;
 538
 539         ext4fs_update();
 540         ext4fs_deinit();
 541         ext4fs_reinit_global();
 542
 543         if (ext4fs_init() != 0) {
 544                 printf("error in File System init\n");
 545                 goto fail;
 546         }
 547
 548         free(start_block_address);
 549         free(journal_buffer);
 550
 551         return 0;
 552 fail:
 553         free(start_block_address);
 554         free(journal_buffer);
 555
 556         return -1;
 557 }
 558
 559 int ext4fs_init(void)
 560 {
 561         short status;
 562         int i;
 563         uint32_t real_free_blocks = 0;
 564         struct ext_filesystem *fs = get_fs();
 565
 566         /* populate fs */
 567         fs->blksz = EXT2_BLOCK_SIZE(ext4fs_root);
 568         fs->sect_perblk = fs->blksz >> fs->dev_desc->log2blksz;
 569
 570         /* get the superblock */
 571         fs->sb = zalloc(SUPERBLOCK_SIZE);
 572         if (!fs->sb)
 573                 return -ENOMEM;
 574         if (!ext4_read_superblock((char *)fs->sb))
 575                 goto fail;
 576
 577         /* init journal */
 578         if (ext4fs_init_journal())
 579                 goto fail;
 580
 581         /* get total no of blockgroups */
 582         fs->no_blkgrp = (uint32_t)ext4fs_div_roundup(
 583                         le32_to_cpu(ext4fs_root->sblock.total_blocks)
 584                         - le32_to_cpu(ext4fs_root->sblock.first_data_block),
 585                         le32_to_cpu(ext4fs_root->sblock.blocks_per_group));
 586
 587         /* get the block group descriptor table */
 588         fs->gdtable_blkno = ((EXT2_MIN_BLOCK_SIZE == fs->blksz) + 1);
 589         if (ext4fs_get_bgdtable() == -1) {
 590                 printf("Error in getting the block group descriptor table\n");
 591                 goto fail;
 592         }
 593         fs->bgd = (struct ext2_block_group *)fs->gdtable;
 594
 595         /* load all the available bitmap block of the partition */
 596         fs->blk_bmaps = zalloc(fs->no_blkgrp * sizeof(char *));
 597         if (!fs->blk_bmaps)
 598                 goto fail;
 599         for (i = 0; i < fs->no_blkgrp; i++) {
 600                 fs->blk_bmaps[i] = zalloc(fs->blksz);
 601                 if (!fs->blk_bmaps[i])
 602                         goto fail;
 603         }
 604
 605         for (i = 0; i < fs->no_blkgrp; i++) {
 606                 status =
 607                     ext4fs_devread(
 608                                    (lbaint_t)le32_to_cpu(fs->bgd[i].block_id) *
 609                                    fs->sect_perblk, 0,
 610                                    fs->blksz, (char *)fs->blk_bmaps[i]);
 611                 if (status == 0)
 612                         goto fail;
 613         }
 614
 615         /* load all the available inode bitmap of the partition */
 616         fs->inode_bmaps = zalloc(fs->no_blkgrp * sizeof(unsigned char *));
 617         if (!fs->inode_bmaps)
 618                 goto fail;
 619         for (i = 0; i < fs->no_blkgrp; i++) {
 620                 fs->inode_bmaps[i] = zalloc(fs->blksz);
 621                 if (!fs->inode_bmaps[i])
 622                         goto fail;
 623         }
 624
 625         for (i = 0; i < fs->no_blkgrp; i++) {
 626                 status = ext4fs_devread(
 627                                         (lbaint_t)le32_to_cpu(fs->bgd[i].inode_id) *
 628                                         fs->sect_perblk,
 629                                         0, fs->blksz,
 630                                         (char *)fs->inode_bmaps[i]);
 631                 if (status == 0)
 632                         goto fail;
 633         }
 634
 635         /*
 636          * check filesystem consistency with free blocks of file system
 637          * some time we observed that superblock freeblocks does not match
 638          * with the  blockgroups freeblocks when improper
 639          * reboot of a linux kernel
 640          */
 641         for (i = 0; i < fs->no_blkgrp; i++)
 642                 real_free_blocks = real_free_blocks + le16_to_cpu(fs->bgd[i].free_blocks);
 643         if (real_free_blocks != le32_to_cpu(fs->sb->free_blocks))
 644                 fs->sb->free_blocks = cpu_to_le32(real_free_blocks);
 645
 646         return 0;
 647 fail:
 648         ext4fs_deinit();
 649
 650         return -1;
 651 }
 652
 653 void ext4fs_deinit(void)
 654 {
 655         int i;
 656         struct ext2_inode inode_journal;
 657         struct journal_superblock_t *jsb;
 658         uint32_t blknr;
 659         struct ext_filesystem *fs = get_fs();
 660         uint32_t new_feature_incompat;
 661
 662         /* free journal */
 663         char *temp_buff = zalloc(fs->blksz);
 664         if (temp_buff) {
 665                 ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO,
 666                                   &inode_journal);
 667                 blknr = read_allocated_block(&inode_journal,
 668                                         EXT2_JOURNAL_SUPERBLOCK);
 669                 ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, fs->blksz,
 670                                temp_buff);
 671                 jsb = (struct journal_superblock_t *)temp_buff;
 672                 jsb->s_start = 0;
 673                 put_ext4((uint64_t) ((uint64_t)blknr * (uint64_t)fs->blksz),
 674                          (struct journal_superblock_t *)temp_buff, fs->blksz);
 675                 free(temp_buff);
 676         }
 677         ext4fs_free_journal();
 678
 679         /* get the superblock */
 680         ext4_read_superblock((char *)fs->sb);
 681         new_feature_incompat = le32_to_cpu(fs->sb->feature_incompat);
 682         new_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
 683         fs->sb->feature_incompat = cpu_to_le32(new_feature_incompat);
 684         put_ext4((uint64_t)(SUPERBLOCK_SIZE),
 685                  (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
 686         free(fs->sb);
 687         fs->sb = NULL;
 688
 689         if (fs->blk_bmaps) {
 690                 for (i = 0; i < fs->no_blkgrp; i++) {
 691                         free(fs->blk_bmaps[i]);
 692                         fs->blk_bmaps[i] = NULL;
 693                 }
 694                 free(fs->blk_bmaps);
 695                 fs->blk_bmaps = NULL;
 696         }
 697
 698         if (fs->inode_bmaps) {
 699                 for (i = 0; i < fs->no_blkgrp; i++) {
 700                         free(fs->inode_bmaps[i]);
 701                         fs->inode_bmaps[i] = NULL;
 702                 }
 703                 free(fs->inode_bmaps);
 704                 fs->inode_bmaps = NULL;
 705         }
 706
 707
 708         free(fs->gdtable);
 709         fs->gdtable = NULL;
 710         fs->bgd = NULL;
 711         /*
 712          * reinitiliazed the global inode and
 713          * block bitmap first execution check variables
 714          */
 715         fs->first_pass_ibmap = 0;
 716         fs->first_pass_bbmap = 0;
 717         fs->curr_inode_no = 0;
 718         fs->curr_blkno = 0;
 719 }
 720
 721 static int ext4fs_write_file(struct ext2_inode *file_inode,
 722                              int pos, unsigned int len, char *buf)
 723 {
 724         int i;
 725         int blockcnt;
 726         uint32_t filesize = le32_to_cpu(file_inode->size);
 727         struct ext_filesystem *fs = get_fs();
 728         int log2blksz = fs->dev_desc->log2blksz;
 729         int log2_fs_blocksize = LOG2_BLOCK_SIZE(ext4fs_root) - log2blksz;
 730         int previous_block_number = -1;
 731         int delayed_start = 0;
 732         int delayed_extent = 0;
 733         int delayed_next = 0;
 734         char *delayed_buf = NULL;
 735
 736         /* Adjust len so it we can't read past the end of the file. */
 737         if (len > filesize)
 738                 len = filesize;
 739
 740         blockcnt = ((len + pos) + fs->blksz - 1) / fs->blksz;
 741
 742         for (i = pos / fs->blksz; i < blockcnt; i++) {
 743                 long int blknr;
 744                 int blockend = fs->blksz;
 745                 int skipfirst = 0;
 746                 blknr = read_allocated_block(file_inode, i);
 747                 if (blknr < 0)
 748                         return -1;
 749
 750                 blknr = blknr << log2_fs_blocksize;
 751
 752                 if (blknr) {
 753                         if (previous_block_number != -1) {
 754                                 if (delayed_next == blknr) {
 755                                         delayed_extent += blockend;
 756                                         delayed_next += blockend >> log2blksz;
 757                                 } else {        /* spill */
 758                                         put_ext4((uint64_t)
 759                                                  ((uint64_t)delayed_start << log2blksz),
 760                                                  delayed_buf,
 761                                                  (uint32_t) delayed_extent);
 762                                         previous_block_number = blknr;
 763                                         delayed_start = blknr;
 764                                         delayed_extent = blockend;
 765                                         delayed_buf = buf;
 766                                         delayed_next = blknr +
 767                                             (blockend >> log2blksz);
 768                                 }
 769                         } else {
 770                                 previous_block_number = blknr;
 771                                 delayed_start = blknr;
 772                                 delayed_extent = blockend;
 773                                 delayed_buf = buf;
 774                                 delayed_next = blknr +
 775                                     (blockend >> log2blksz);
 776                         }
 777                 } else {
 778                         if (previous_block_number != -1) {
 779                                 /* spill */
 780                                 put_ext4((uint64_t) ((uint64_t)delayed_start <<
 781                                                      log2blksz),
 782                                          delayed_buf,
 783                                          (uint32_t) delayed_extent);
 784                                 previous_block_number = -1;
 785                         }
 786                         memset(buf, 0, fs->blksz - skipfirst);
 787                 }
 788                 buf += fs->blksz - skipfirst;
 789         }
 790         if (previous_block_number != -1) {
 791                 /* spill */
 792                 put_ext4((uint64_t) ((uint64_t)delayed_start << log2blksz),
 793                          delayed_buf, (uint32_t) delayed_extent);
 794                 previous_block_number = -1;
 795         }
 796
 797         return len;
 798 }
 799
 800 int ext4fs_write(const char *fname, unsigned char *buffer,
 801                                         unsigned long sizebytes)
 802 {
 803         int ret = 0;
 804         struct ext2_inode *file_inode = NULL;
 805         unsigned char *inode_buffer = NULL;
 806         int parent_inodeno;
 807         int inodeno;
 808         time_t timestamp = 0;
 809
 810         uint64_t bytes_reqd_for_file;
 811         unsigned int blks_reqd_for_file;
 812         unsigned int blocks_remaining;
 813         int existing_file_inodeno;
 814         char *temp_ptr = NULL;
 815         long int itable_blkno;
 816         long int parent_itable_blkno;
 817         long int blkoff;
 818         struct ext2_sblock *sblock = &(ext4fs_root->sblock);
 819         unsigned int inodes_per_block;
 820         unsigned int ibmap_idx;
 821         struct ext_filesystem *fs = get_fs();
 822         ALLOC_CACHE_ALIGN_BUFFER(char, filename, 256);
 823         memset(filename, 0x00, 256);
 824
 825         g_parent_inode = zalloc(fs->inodesz);
 826         if (!g_parent_inode)
 827                 goto fail;
 828
 829         if (ext4fs_init() != 0) {
 830                 printf("error in File System init\n");
 831                 return -1;
 832         }
 833         inodes_per_block = fs->blksz / fs->inodesz;
 834         parent_inodeno = ext4fs_get_parent_inode_num(fname, filename, F_FILE);
 835         if (parent_inodeno == -1)
 836                 goto fail;
 837         if (ext4fs_iget(parent_inodeno, g_parent_inode))
 838                 goto fail;
 839         /* do not mess up a directory using hash trees */
 840         if (le32_to_cpu(g_parent_inode->flags) & EXT4_INDEX_FL) {
 841                 printf("hash tree directory\n");
 842                 goto fail;
 843         }
 844         /* check if the filename is already present in root */
 845         existing_file_inodeno = ext4fs_filename_unlink(filename);
 846         if (existing_file_inodeno != -1) {
 847                 ret = ext4fs_delete_file(existing_file_inodeno);
 848                 fs->first_pass_bbmap = 0;
 849                 fs->curr_blkno = 0;
 850
 851                 fs->first_pass_ibmap = 0;
 852                 fs->curr_inode_no = 0;
 853                 if (ret)
 854                         goto fail;
 855         }
 856         /* calucalate how many blocks required */
 857         bytes_reqd_for_file = sizebytes;
 858         blks_reqd_for_file = lldiv(bytes_reqd_for_file, fs->blksz);
 859         if (do_div(bytes_reqd_for_file, fs->blksz) != 0) {
 860                 blks_reqd_for_file++;
 861                 debug("total bytes for a file %u\n", blks_reqd_for_file);
 862         }
 863         blocks_remaining = blks_reqd_for_file;
 864         /* test for available space in partition */
 865         if (le32_to_cpu(fs->sb->free_blocks) < blks_reqd_for_file) {
 866                 printf("Not enough space on partition !!!\n");
 867                 goto fail;
 868         }
 869
 870         inodeno = ext4fs_update_parent_dentry(filename, FILETYPE_REG);
 871         if (inodeno == -1)
 872                 goto fail;
 873         /* prepare file inode */
 874         inode_buffer = zalloc(fs->inodesz);
 875         if (!inode_buffer)
 876                 goto fail;
 877         file_inode = (struct ext2_inode *)inode_buffer;
 878         file_inode->mode = cpu_to_le16(S_IFREG | S_IRWXU |
 879             S_IRGRP | S_IROTH | S_IXGRP | S_IXOTH);
 880         /* ToDo: Update correct time */
 881         file_inode->mtime = cpu_to_le32(timestamp);
 882         file_inode->atime = cpu_to_le32(timestamp);
 883         file_inode->ctime = cpu_to_le32(timestamp);
 884         file_inode->nlinks = cpu_to_le16(1);
 885         file_inode->size = cpu_to_le32(sizebytes);
 886
 887         /* Allocate data blocks */
 888         ext4fs_allocate_blocks(file_inode, blocks_remaining,
 889                                &blks_reqd_for_file);
 890         file_inode->blockcnt = cpu_to_le32((blks_reqd_for_file * fs->blksz) >>
 891                 fs->dev_desc->log2blksz);
 892
 893         temp_ptr = zalloc(fs->blksz);
 894         if (!temp_ptr)
 895                 goto fail;
 896         ibmap_idx = inodeno / le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
 897         inodeno--;
 898         itable_blkno = le32_to_cpu(fs->bgd[ibmap_idx].inode_table_id) +
 899                         (inodeno % le32_to_cpu(sblock->inodes_per_group)) /
 900                         inodes_per_block;
 901         blkoff = (inodeno % inodes_per_block) * fs->inodesz;
 902         ext4fs_devread((lbaint_t)itable_blkno * fs->sect_perblk, 0, fs->blksz,
 903                        temp_ptr);
 904         if (ext4fs_log_journal(temp_ptr, itable_blkno))
 905                 goto fail;
 906
 907         memcpy(temp_ptr + blkoff, inode_buffer, fs->inodesz);
 908         if (ext4fs_put_metadata(temp_ptr, itable_blkno))
 909                 goto fail;
 910         /* copy the file content into data blocks */
 911         if (ext4fs_write_file(file_inode, 0, sizebytes, (char *)buffer) == -1) {
 912                 printf("Error in copying content\n");
 913                 goto fail;
 914         }
 915         ibmap_idx = parent_inodeno / le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
 916         parent_inodeno--;
 917         parent_itable_blkno = le32_to_cpu(fs->bgd[ibmap_idx].inode_table_id) +
 918             (parent_inodeno %
 919              le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
 920         blkoff = (parent_inodeno % inodes_per_block) * fs->inodesz;
 921         if (parent_itable_blkno != itable_blkno) {
 922                 memset(temp_ptr, '\0', fs->blksz);
 923                 ext4fs_devread((lbaint_t)parent_itable_blkno * fs->sect_perblk,
 924                                0, fs->blksz, temp_ptr);
 925                 if (ext4fs_log_journal(temp_ptr, parent_itable_blkno))
 926                         goto fail;
 927
 928                 memcpy(temp_ptr + blkoff, g_parent_inode, fs->inodesz);
 929                 if (ext4fs_put_metadata(temp_ptr, parent_itable_blkno))
 930                         goto fail;
 931         } else {
 932                 /*
 933                  * If parent and child fall in same inode table block
 934                  * both should be kept in 1 buffer
 935                  */
 936                 memcpy(temp_ptr + blkoff, g_parent_inode, fs->inodesz);
 937                 gd_index--;
 938                 if (ext4fs_put_metadata(temp_ptr, itable_blkno))
 939                         goto fail;
 940         }
 941         ext4fs_update();
 942         ext4fs_deinit();
 943
 944         fs->first_pass_bbmap = 0;
 945         fs->curr_blkno = 0;
 946         fs->first_pass_ibmap = 0;
 947         fs->curr_inode_no = 0;
 948         free(inode_buffer);
 949         free(g_parent_inode);
 950         free(temp_ptr);
 951         g_parent_inode = NULL;
 952
 953         return 0;
 954 fail:
 955         ext4fs_deinit();
 956         free(inode_buffer);
 957         free(g_parent_inode);
 958         free(temp_ptr);
 959         g_parent_inode = NULL;
 960
 961         return -1;
 962 }
 963
 964 int ext4_write_file(const char *filename, void *buf, loff_t offset,
 965                     loff_t len, loff_t *actwrite)
 966 {
 967         int ret;
 968
 969         if (offset != 0) {
 970                 printf("** Cannot support non-zero offset **\n");
 971                 return -1;
 972         }
 973
 974         ret = ext4fs_write(filename, buf, len);
 975         if (ret) {
 976                 printf("** Error ext4fs_write() **\n");
 977                 goto fail;
 978         }
 979
 980         *actwrite = len;
 981
 982         return 0;
 983
 984 fail:
 985         *actwrite = 0;
 986
 987         return -1;
 988 }