fs/ext4/ext4_write.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 and load support in Uboot.
   9  *                     Ext4 read optimization taken from Open-Moko
  10  *                     Qi bootloader
  11  *
  12  * (C) Copyright 2004
  13  * esd gmbh <www.esd-electronics.com>
  14  * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
  15  *
  16  * based on code from grub2 fs/ext2.c and fs/fshelp.c by
  17  * GRUB  --  GRand Unified Bootloader
  18  * Copyright (C) 2003, 2004  Free Software Foundation, Inc.
  19  *
  20  * ext4write : Based on generic ext4 protocol.
  21  */
  22
  23
  24 #include <common.h>
  25 #include <memalign.h>
  26 #include <linux/stat.h>
  27 #include <div64.h>
  28 #include "ext4_common.h"
  29
  30 static inline void ext4fs_sb_free_inodes_inc(struct ext2_sblock *sb)
  31 {
  32         sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) + 1);
  33 }
  34
  35 static inline void ext4fs_sb_free_blocks_inc(struct ext2_sblock *sb)
  36 {
  37         sb->free_blocks = cpu_to_le32(le32_to_cpu(sb->free_blocks) + 1);
  38 }
  39
  40 static inline void ext4fs_bg_free_inodes_inc
  41         (struct ext2_block_group *bg, const struct ext_filesystem *fs)
  42 {
  43         uint32_t free_inodes = le16_to_cpu(bg->free_inodes);
  44         if (fs->gdsize == 64)
  45                 free_inodes += le16_to_cpu(bg->free_inodes_high) << 16;
  46         free_inodes++;
  47
  48         bg->free_inodes = cpu_to_le16(free_inodes & 0xffff);
  49         if (fs->gdsize == 64)
  50                 bg->free_inodes_high = cpu_to_le16(free_inodes >> 16);
  51 }
  52
  53 static inline void ext4fs_bg_free_blocks_inc
  54         (struct ext2_block_group *bg, const struct ext_filesystem *fs)
  55 {
  56         uint32_t free_blocks = le16_to_cpu(bg->free_blocks);
  57         if (fs->gdsize == 64)
  58                 free_blocks += le16_to_cpu(bg->free_blocks_high) << 16;
  59         free_blocks++;
  60
  61         bg->free_blocks = cpu_to_le16(free_blocks & 0xffff);
  62         if (fs->gdsize == 64)
  63                 bg->free_blocks_high = cpu_to_le16(free_blocks >> 16);
  64 }
  65
  66 static void ext4fs_update(void)
  67 {
  68         short i;
  69         ext4fs_update_journal();
  70         struct ext_filesystem *fs = get_fs();
  71         struct ext2_block_group *bgd = NULL;
  72
  73         /* update  super block */
  74         put_ext4((uint64_t)(SUPERBLOCK_SIZE),
  75                  (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
  76
  77         /* update block bitmaps */
  78         for (i = 0; i < fs->no_blkgrp; i++) {
  79                 bgd = ext4fs_get_group_descriptor(fs, i);
  80                 bgd->bg_checksum = cpu_to_le16(ext4fs_checksum_update(i));
  81                 uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
  82                 put_ext4(b_bitmap_blk * fs->blksz,
  83                          fs->blk_bmaps[i], fs->blksz);
  84         }
  85
  86         /* update inode bitmaps */
  87         for (i = 0; i < fs->no_blkgrp; i++) {
  88                 bgd = ext4fs_get_group_descriptor(fs, i);
  89                 uint64_t i_bitmap_blk = ext4fs_bg_get_inode_id(bgd, fs);
  90                 put_ext4(i_bitmap_blk * fs->blksz,
  91                          fs->inode_bmaps[i], fs->blksz);
  92         }
  93
  94         /* update the block group descriptor table */
  95         put_ext4((uint64_t)((uint64_t)fs->gdtable_blkno * (uint64_t)fs->blksz),
  96                  (struct ext2_block_group *)fs->gdtable,
  97                  (fs->blksz * fs->no_blk_pergdt));
  98
  99         ext4fs_dump_metadata();
 100
 101         gindex = 0;
 102         gd_index = 0;
 103 }
 104
 105 int ext4fs_get_bgdtable(void)
 106 {
 107         int status;
 108         struct ext_filesystem *fs = get_fs();
 109         int gdsize_total = ROUND(fs->no_blkgrp * fs->gdsize, fs->blksz);
 110         fs->no_blk_pergdt = gdsize_total / fs->blksz;
 111
 112         /* allocate memory for gdtable */
 113         fs->gdtable = zalloc(gdsize_total);
 114         if (!fs->gdtable)
 115                 return -ENOMEM;
 116         /* read the group descriptor table */
 117         status = ext4fs_devread((lbaint_t)fs->gdtable_blkno * fs->sect_perblk,
 118                                 0, fs->blksz * fs->no_blk_pergdt, fs->gdtable);
 119         if (status == 0)
 120                 goto fail;
 121
 122         if (ext4fs_log_gdt(fs->gdtable)) {
 123                 printf("Error in ext4fs_log_gdt\n");
 124                 return -1;
 125         }
 126
 127         return 0;
 128 fail:
 129         free(fs->gdtable);
 130         fs->gdtable = NULL;
 131
 132         return -1;
 133 }
 134
 135 static void delete_single_indirect_block(struct ext2_inode *inode)
 136 {
 137         struct ext2_block_group *bgd = NULL;
 138         static int prev_bg_bmap_idx = -1;
 139         uint32_t blknr;
 140         int remainder;
 141         int bg_idx;
 142         int status;
 143         uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 144         struct ext_filesystem *fs = get_fs();
 145         char *journal_buffer = zalloc(fs->blksz);
 146         if (!journal_buffer) {
 147                 printf("No memory\n");
 148                 return;
 149         }
 150
 151         /* deleting the single indirect block associated with inode */
 152         if (inode->b.blocks.indir_block != 0) {
 153                 blknr = le32_to_cpu(inode->b.blocks.indir_block);
 154                 debug("SIPB releasing %u\n", blknr);
 155                 bg_idx = blknr / blk_per_grp;
 156                 if (fs->blksz == 1024) {
 157                         remainder = blknr % blk_per_grp;
 158                         if (!remainder)
 159                                 bg_idx--;
 160                 }
 161                 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
 162                 /* get  block group descriptor table */
 163                 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
 164                 ext4fs_bg_free_blocks_inc(bgd, fs);
 165                 ext4fs_sb_free_blocks_inc(fs->sb);
 166                 /* journal backup */
 167                 if (prev_bg_bmap_idx != bg_idx) {
 168                         uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
 169                         status = ext4fs_devread(
 170                                            b_bitmap_blk * fs->sect_perblk,
 171                                            0, fs->blksz, journal_buffer);
 172                         if (status == 0)
 173                                 goto fail;
 174                         if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
 175                                 goto fail;
 176                         prev_bg_bmap_idx = bg_idx;
 177                 }
 178         }
 179 fail:
 180         free(journal_buffer);
 181 }
 182
 183 static void delete_double_indirect_block(struct ext2_inode *inode)
 184 {
 185         int i;
 186         short status;
 187         static int prev_bg_bmap_idx = -1;
 188         uint32_t blknr;
 189         int remainder;
 190         int bg_idx;
 191         uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 192         __le32 *di_buffer = NULL;
 193         void *dib_start_addr = NULL;
 194         struct ext2_block_group *bgd = NULL;
 195         struct ext_filesystem *fs = get_fs();
 196         char *journal_buffer = zalloc(fs->blksz);
 197         if (!journal_buffer) {
 198                 printf("No memory\n");
 199                 return;
 200         }
 201
 202         if (inode->b.blocks.double_indir_block != 0) {
 203                 di_buffer = zalloc(fs->blksz);
 204                 if (!di_buffer) {
 205                         printf("No memory\n");
 206                         return;
 207                 }
 208                 dib_start_addr = di_buffer;
 209                 blknr = le32_to_cpu(inode->b.blocks.double_indir_block);
 210                 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
 211                                         fs->blksz, (char *)di_buffer);
 212                 for (i = 0; i < fs->blksz / sizeof(int); i++) {
 213                         if (*di_buffer == 0)
 214                                 break;
 215
 216                         debug("DICB releasing %u\n", *di_buffer);
 217                         bg_idx = le32_to_cpu(*di_buffer) / blk_per_grp;
 218                         if (fs->blksz == 1024) {
 219                                 remainder = le32_to_cpu(*di_buffer) % blk_per_grp;
 220                                 if (!remainder)
 221                                         bg_idx--;
 222                         }
 223                         /* get  block group descriptor table */
 224                         bgd = ext4fs_get_group_descriptor(fs, bg_idx);
 225                         ext4fs_reset_block_bmap(le32_to_cpu(*di_buffer),
 226                                         fs->blk_bmaps[bg_idx], bg_idx);
 227                         di_buffer++;
 228                         ext4fs_bg_free_blocks_inc(bgd, fs);
 229                         ext4fs_sb_free_blocks_inc(fs->sb);
 230                         /* journal backup */
 231                         if (prev_bg_bmap_idx != bg_idx) {
 232                                 uint64_t b_bitmap_blk =
 233                                         ext4fs_bg_get_block_id(bgd, fs);
 234                                 status = ext4fs_devread(b_bitmap_blk
 235                                                         * fs->sect_perblk, 0,
 236                                                         fs->blksz,
 237                                                         journal_buffer);
 238                                 if (status == 0)
 239                                         goto fail;
 240
 241                                 if (ext4fs_log_journal(journal_buffer,
 242                                                        b_bitmap_blk))
 243                                         goto fail;
 244                                 prev_bg_bmap_idx = bg_idx;
 245                         }
 246                 }
 247
 248                 /* removing the parent double indirect block */
 249                 blknr = le32_to_cpu(inode->b.blocks.double_indir_block);
 250                 bg_idx = blknr / blk_per_grp;
 251                 if (fs->blksz == 1024) {
 252                         remainder = blknr % blk_per_grp;
 253                         if (!remainder)
 254                                 bg_idx--;
 255                 }
 256                 /* get  block group descriptor table */
 257                 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
 258                 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
 259                 ext4fs_bg_free_blocks_inc(bgd, fs);
 260                 ext4fs_sb_free_blocks_inc(fs->sb);
 261                 /* journal backup */
 262                 if (prev_bg_bmap_idx != bg_idx) {
 263                         uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
 264                         status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
 265                                                 0, fs->blksz, journal_buffer);
 266                         if (status == 0)
 267                                 goto fail;
 268
 269                         if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
 270                                 goto fail;
 271                         prev_bg_bmap_idx = bg_idx;
 272                 }
 273                 debug("DIPB releasing %d\n", blknr);
 274         }
 275 fail:
 276         free(dib_start_addr);
 277         free(journal_buffer);
 278 }
 279
 280 static void delete_triple_indirect_block(struct ext2_inode *inode)
 281 {
 282         int i, j;
 283         short status;
 284         static int prev_bg_bmap_idx = -1;
 285         uint32_t blknr;
 286         int remainder;
 287         int bg_idx;
 288         uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 289         __le32 *tigp_buffer = NULL;
 290         void *tib_start_addr = NULL;
 291         __le32 *tip_buffer = NULL;
 292         void *tipb_start_addr = NULL;
 293         struct ext2_block_group *bgd = NULL;
 294         struct ext_filesystem *fs = get_fs();
 295         char *journal_buffer = zalloc(fs->blksz);
 296         if (!journal_buffer) {
 297                 printf("No memory\n");
 298                 return;
 299         }
 300
 301         if (inode->b.blocks.triple_indir_block != 0) {
 302                 tigp_buffer = zalloc(fs->blksz);
 303                 if (!tigp_buffer) {
 304                         printf("No memory\n");
 305                         return;
 306                 }
 307                 tib_start_addr = tigp_buffer;
 308                 blknr = le32_to_cpu(inode->b.blocks.triple_indir_block);
 309                 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
 310                                         fs->blksz, (char *)tigp_buffer);
 311                 for (i = 0; i < fs->blksz / sizeof(int); i++) {
 312                         if (*tigp_buffer == 0)
 313                                 break;
 314                         debug("tigp buffer releasing %u\n", *tigp_buffer);
 315
 316                         tip_buffer = zalloc(fs->blksz);
 317                         if (!tip_buffer)
 318                                 goto fail;
 319                         tipb_start_addr = tip_buffer;
 320                         status = ext4fs_devread((lbaint_t)le32_to_cpu(*tigp_buffer) *
 321                                                 fs->sect_perblk, 0, fs->blksz,
 322                                                 (char *)tip_buffer);
 323                         for (j = 0; j < fs->blksz / sizeof(int); j++) {
 324                                 if (le32_to_cpu(*tip_buffer) == 0)
 325                                         break;
 326                                 bg_idx = le32_to_cpu(*tip_buffer) / blk_per_grp;
 327                                 if (fs->blksz == 1024) {
 328                                         remainder = le32_to_cpu(*tip_buffer) % blk_per_grp;
 329                                         if (!remainder)
 330                                                 bg_idx--;
 331                                 }
 332
 333                                 ext4fs_reset_block_bmap(le32_to_cpu(*tip_buffer),
 334                                                         fs->blk_bmaps[bg_idx],
 335                                                         bg_idx);
 336
 337                                 tip_buffer++;
 338                                 /* get  block group descriptor table */
 339                                 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
 340                                 ext4fs_bg_free_blocks_inc(bgd, fs);
 341                                 ext4fs_sb_free_blocks_inc(fs->sb);
 342                                 /* journal backup */
 343                                 if (prev_bg_bmap_idx != bg_idx) {
 344                                         uint64_t b_bitmap_blk =
 345                                                 ext4fs_bg_get_block_id(bgd, fs);
 346                                         status =
 347                                             ext4fs_devread(
 348                                                         b_bitmap_blk *
 349                                                         fs->sect_perblk, 0,
 350                                                         fs->blksz,
 351                                                         journal_buffer);
 352                                         if (status == 0)
 353                                                 goto fail;
 354
 355                                         if (ext4fs_log_journal(journal_buffer,
 356                                                                b_bitmap_blk))
 357                                                 goto fail;
 358                                         prev_bg_bmap_idx = bg_idx;
 359                                 }
 360                         }
 361                         free(tipb_start_addr);
 362                         tipb_start_addr = NULL;
 363
 364                         /*
 365                          * removing the grand parent blocks
 366                          * which is connected to inode
 367                          */
 368                         bg_idx = le32_to_cpu(*tigp_buffer) / blk_per_grp;
 369                         if (fs->blksz == 1024) {
 370                                 remainder = le32_to_cpu(*tigp_buffer) % blk_per_grp;
 371                                 if (!remainder)
 372                                         bg_idx--;
 373                         }
 374                         ext4fs_reset_block_bmap(le32_to_cpu(*tigp_buffer),
 375                                                 fs->blk_bmaps[bg_idx], bg_idx);
 376
 377                         tigp_buffer++;
 378                         /* get  block group descriptor table */
 379                         bgd = ext4fs_get_group_descriptor(fs, bg_idx);
 380                         ext4fs_bg_free_blocks_inc(bgd, fs);
 381                         ext4fs_sb_free_blocks_inc(fs->sb);
 382                         /* journal backup */
 383                         if (prev_bg_bmap_idx != bg_idx) {
 384                                 uint64_t b_bitmap_blk =
 385                                         ext4fs_bg_get_block_id(bgd, fs);
 386                                 memset(journal_buffer, '\0', fs->blksz);
 387                                 status = ext4fs_devread(b_bitmap_blk *
 388                                                         fs->sect_perblk, 0,
 389                                                         fs->blksz,
 390                                                         journal_buffer);
 391                                 if (status == 0)
 392                                         goto fail;
 393
 394                                 if (ext4fs_log_journal(journal_buffer,
 395                                                        b_bitmap_blk))
 396                                         goto fail;
 397                                 prev_bg_bmap_idx = bg_idx;
 398                         }
 399                 }
 400
 401                 /* removing the grand parent triple indirect block */
 402                 blknr = le32_to_cpu(inode->b.blocks.triple_indir_block);
 403                 bg_idx = blknr / blk_per_grp;
 404                 if (fs->blksz == 1024) {
 405                         remainder = blknr % blk_per_grp;
 406                         if (!remainder)
 407                                 bg_idx--;
 408                 }
 409                 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
 410                 /* get  block group descriptor table */
 411                 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
 412                 ext4fs_bg_free_blocks_inc(bgd, fs);
 413                 ext4fs_sb_free_blocks_inc(fs->sb);
 414                 /* journal backup */
 415                 if (prev_bg_bmap_idx != bg_idx) {
 416                         uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
 417                         status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
 418                                                 0, fs->blksz, journal_buffer);
 419                         if (status == 0)
 420                                 goto fail;
 421
 422                         if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
 423                                 goto fail;
 424                         prev_bg_bmap_idx = bg_idx;
 425                 }
 426                 debug("tigp buffer itself releasing %d\n", blknr);
 427         }
 428 fail:
 429         free(tib_start_addr);
 430         free(tipb_start_addr);
 431         free(journal_buffer);
 432 }
 433
 434 static int ext4fs_delete_file(int inodeno)
 435 {
 436         struct ext2_inode inode;
 437         short status;
 438         int i;
 439         int remainder;
 440         long int blknr;
 441         int bg_idx;
 442         int ibmap_idx;
 443         char *read_buffer = NULL;
 444         char *start_block_address = NULL;
 445         uint32_t no_blocks;
 446
 447         static int prev_bg_bmap_idx = -1;
 448         unsigned int inodes_per_block;
 449         uint32_t blkno;
 450         unsigned int blkoff;
 451         uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 452         uint32_t inode_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
 453         struct ext2_inode *inode_buffer = NULL;
 454         struct ext2_block_group *bgd = NULL;
 455         struct ext_filesystem *fs = get_fs();
 456         char *journal_buffer = zalloc(fs->blksz);
 457         if (!journal_buffer)
 458                 return -ENOMEM;
 459         status = ext4fs_read_inode(ext4fs_root, inodeno, &inode);
 460         if (status == 0)
 461                 goto fail;
 462
 463         /* read the block no allocated to a file */
 464         no_blocks = le32_to_cpu(inode.size) / fs->blksz;
 465         if (le32_to_cpu(inode.size) % fs->blksz)
 466                 no_blocks++;
 467
 468         if (le32_to_cpu(inode.flags) & EXT4_EXTENTS_FL) {
 469                 /* FIXME delete extent index blocks, i.e. eh_depth >= 1 */
 470                 struct ext4_extent_header *eh =
 471                         (struct ext4_extent_header *)
 472                                 inode.b.blocks.dir_blocks;
 473                 debug("del: dep=%d entries=%d\n", eh->eh_depth, eh->eh_entries);
 474         } else {
 475                 delete_single_indirect_block(&inode);
 476                 delete_double_indirect_block(&inode);
 477                 delete_triple_indirect_block(&inode);
 478         }
 479
 480         /* release data blocks */
 481         for (i = 0; i < no_blocks; i++) {
 482                 blknr = read_allocated_block(&inode, i);
 483                 if (blknr == 0)
 484                         continue;
 485                 if (blknr < 0)
 486                         goto fail;
 487                 bg_idx = blknr / blk_per_grp;
 488                 if (fs->blksz == 1024) {
 489                         remainder = blknr % blk_per_grp;
 490                         if (!remainder)
 491                                 bg_idx--;
 492                 }
 493                 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx],
 494                                         bg_idx);
 495                 debug("EXT4 Block releasing %ld: %d\n", blknr, bg_idx);
 496
 497                 /* get  block group descriptor table */
 498                 bgd = ext4fs_get_group_descriptor(fs, bg_idx);
 499                 ext4fs_bg_free_blocks_inc(bgd, fs);
 500                 ext4fs_sb_free_blocks_inc(fs->sb);
 501                 /* journal backup */
 502                 if (prev_bg_bmap_idx != bg_idx) {
 503                         uint64_t b_bitmap_blk = ext4fs_bg_get_block_id(bgd, fs);
 504                         status = ext4fs_devread(b_bitmap_blk * fs->sect_perblk,
 505                                                 0, fs->blksz,
 506                                                 journal_buffer);
 507                         if (status == 0)
 508                                 goto fail;
 509                         if (ext4fs_log_journal(journal_buffer, b_bitmap_blk))
 510                                 goto fail;
 511                         prev_bg_bmap_idx = bg_idx;
 512                 }
 513         }
 514
 515         /* release inode */
 516         /* from the inode no to blockno */
 517         inodes_per_block = fs->blksz / fs->inodesz;
 518         ibmap_idx = inodeno / inode_per_grp;
 519
 520         /* get the block no */
 521         inodeno--;
 522         /* get  block group descriptor table */
 523         bgd = ext4fs_get_group_descriptor(fs, ibmap_idx);
 524         blkno = ext4fs_bg_get_inode_table_id(bgd, fs) +
 525                 (inodeno % inode_per_grp) / inodes_per_block;
 526
 527         /* get the offset of the inode */
 528         blkoff = ((inodeno) % inodes_per_block) * fs->inodesz;
 529
 530         /* read the block no containing the inode */
 531         read_buffer = zalloc(fs->blksz);
 532         if (!read_buffer)
 533                 goto fail;
 534         start_block_address = read_buffer;
 535         status = ext4fs_devread((lbaint_t)blkno * fs->sect_perblk,
 536                                 0, fs->blksz, read_buffer);
 537         if (status == 0)
 538                 goto fail;
 539
 540         if (ext4fs_log_journal(read_buffer, blkno))
 541                 goto fail;
 542
 543         read_buffer = read_buffer + blkoff;
 544         inode_buffer = (struct ext2_inode *)read_buffer;
 545         memset(inode_buffer, '\0', fs->inodesz);
 546
 547         /* write the inode to original position in inode table */
 548         if (ext4fs_put_metadata(start_block_address, blkno))
 549                 goto fail;
 550
 551         /* update the respective inode bitmaps */
 552         inodeno++;
 553         ext4fs_reset_inode_bmap(inodeno, fs->inode_bmaps[ibmap_idx], ibmap_idx);
 554         ext4fs_bg_free_inodes_inc(bgd, fs);
 555         ext4fs_sb_free_inodes_inc(fs->sb);
 556         /* journal backup */
 557         memset(journal_buffer, '\0', fs->blksz);
 558         status = ext4fs_devread(ext4fs_bg_get_inode_id(bgd, fs) *
 559                                 fs->sect_perblk, 0, fs->blksz, journal_buffer);
 560         if (status == 0)
 561                 goto fail;
 562         if (ext4fs_log_journal(journal_buffer, ext4fs_bg_get_inode_id(bgd, fs)))
 563                 goto fail;
 564
 565         ext4fs_update();
 566         ext4fs_deinit();
 567         ext4fs_reinit_global();
 568
 569         if (ext4fs_init() != 0) {
 570                 printf("error in File System init\n");
 571                 goto fail;
 572         }
 573
 574         free(start_block_address);
 575         free(journal_buffer);
 576
 577         return 0;
 578 fail:
 579         free(start_block_address);
 580         free(journal_buffer);
 581
 582         return -1;
 583 }
 584
 585 int ext4fs_init(void)
 586 {
 587         short status;
 588         int i;
 589         uint32_t real_free_blocks = 0;
 590         struct ext_filesystem *fs = get_fs();
 591
 592         /* populate fs */
 593         fs->blksz = EXT2_BLOCK_SIZE(ext4fs_root);
 594         fs->sect_perblk = fs->blksz >> fs->dev_desc->log2blksz;
 595
 596         /* get the superblock */
 597         fs->sb = zalloc(SUPERBLOCK_SIZE);
 598         if (!fs->sb)
 599                 return -ENOMEM;
 600         if (!ext4_read_superblock((char *)fs->sb))
 601                 goto fail;
 602
 603         /* init journal */
 604         if (ext4fs_init_journal())
 605                 goto fail;
 606
 607         /* get total no of blockgroups */
 608         fs->no_blkgrp = (uint32_t)ext4fs_div_roundup(
 609                         le32_to_cpu(ext4fs_root->sblock.total_blocks)
 610                         - le32_to_cpu(ext4fs_root->sblock.first_data_block),
 611                         le32_to_cpu(ext4fs_root->sblock.blocks_per_group));
 612
 613         /* get the block group descriptor table */
 614         fs->gdtable_blkno = ((EXT2_MIN_BLOCK_SIZE == fs->blksz) + 1);
 615         if (ext4fs_get_bgdtable() == -1) {
 616                 printf("Error in getting the block group descriptor table\n");
 617                 goto fail;
 618         }
 619
 620         /* load all the available bitmap block of the partition */
 621         fs->blk_bmaps = zalloc(fs->no_blkgrp * sizeof(char *));
 622         if (!fs->blk_bmaps)
 623                 goto fail;
 624         for (i = 0; i < fs->no_blkgrp; i++) {
 625                 fs->blk_bmaps[i] = zalloc(fs->blksz);
 626                 if (!fs->blk_bmaps[i])
 627                         goto fail;
 628         }
 629
 630         for (i = 0; i < fs->no_blkgrp; i++) {
 631                 struct ext2_block_group *bgd =
 632                         ext4fs_get_group_descriptor(fs, i);
 633                 status = ext4fs_devread(ext4fs_bg_get_block_id(bgd, fs) *
 634                                    fs->sect_perblk, 0,
 635                                    fs->blksz, (char *)fs->blk_bmaps[i]);
 636                 if (status == 0)
 637                         goto fail;
 638         }
 639
 640         /* load all the available inode bitmap of the partition */
 641         fs->inode_bmaps = zalloc(fs->no_blkgrp * sizeof(unsigned char *));
 642         if (!fs->inode_bmaps)
 643                 goto fail;
 644         for (i = 0; i < fs->no_blkgrp; i++) {
 645                 fs->inode_bmaps[i] = zalloc(fs->blksz);
 646                 if (!fs->inode_bmaps[i])
 647                         goto fail;
 648         }
 649
 650         for (i = 0; i < fs->no_blkgrp; i++) {
 651                 struct ext2_block_group *bgd =
 652                         ext4fs_get_group_descriptor(fs, i);
 653                 status = ext4fs_devread(ext4fs_bg_get_inode_id(bgd, fs) *
 654                                         fs->sect_perblk,
 655                                         0, fs->blksz,
 656                                         (char *)fs->inode_bmaps[i]);
 657                 if (status == 0)
 658                         goto fail;
 659         }
 660
 661         /*
 662          * check filesystem consistency with free blocks of file system
 663          * some time we observed that superblock freeblocks does not match
 664          * with the  blockgroups freeblocks when improper
 665          * reboot of a linux kernel
 666          */
 667         for (i = 0; i < fs->no_blkgrp; i++) {
 668                 struct ext2_block_group *bgd =
 669                         ext4fs_get_group_descriptor(fs, i);
 670                 real_free_blocks = real_free_blocks +
 671                         ext4fs_bg_get_free_blocks(bgd, fs);
 672         }
 673         if (real_free_blocks != ext4fs_sb_get_free_blocks(fs->sb))
 674                 ext4fs_sb_set_free_blocks(fs->sb, real_free_blocks);
 675
 676         return 0;
 677 fail:
 678         ext4fs_deinit();
 679
 680         return -1;
 681 }
 682
 683 void ext4fs_deinit(void)
 684 {
 685         int i;
 686         struct ext2_inode inode_journal;
 687         struct journal_superblock_t *jsb;
 688         uint32_t blknr;
 689         struct ext_filesystem *fs = get_fs();
 690         uint32_t new_feature_incompat;
 691
 692         /* free journal */
 693         char *temp_buff = zalloc(fs->blksz);
 694         if (temp_buff) {
 695                 ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO,
 696                                   &inode_journal);
 697                 blknr = read_allocated_block(&inode_journal,
 698                                         EXT2_JOURNAL_SUPERBLOCK);
 699                 ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, fs->blksz,
 700                                temp_buff);
 701                 jsb = (struct journal_superblock_t *)temp_buff;
 702                 jsb->s_start = 0;
 703                 put_ext4((uint64_t) ((uint64_t)blknr * (uint64_t)fs->blksz),
 704                          (struct journal_superblock_t *)temp_buff, fs->blksz);
 705                 free(temp_buff);
 706         }
 707         ext4fs_free_journal();
 708
 709         /* get the superblock */
 710         ext4_read_superblock((char *)fs->sb);
 711         new_feature_incompat = le32_to_cpu(fs->sb->feature_incompat);
 712         new_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
 713         fs->sb->feature_incompat = cpu_to_le32(new_feature_incompat);
 714         put_ext4((uint64_t)(SUPERBLOCK_SIZE),
 715                  (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
 716         free(fs->sb);
 717         fs->sb = NULL;
 718
 719         if (fs->blk_bmaps) {
 720                 for (i = 0; i < fs->no_blkgrp; i++) {
 721                         free(fs->blk_bmaps[i]);
 722                         fs->blk_bmaps[i] = NULL;
 723                 }
 724                 free(fs->blk_bmaps);
 725                 fs->blk_bmaps = NULL;
 726         }
 727
 728         if (fs->inode_bmaps) {
 729                 for (i = 0; i < fs->no_blkgrp; i++) {
 730                         free(fs->inode_bmaps[i]);
 731                         fs->inode_bmaps[i] = NULL;
 732                 }
 733                 free(fs->inode_bmaps);
 734                 fs->inode_bmaps = NULL;
 735         }
 736
 737
 738         free(fs->gdtable);
 739         fs->gdtable = NULL;
 740         /*
 741          * reinitiliazed the global inode and
 742          * block bitmap first execution check variables
 743          */
 744         fs->first_pass_ibmap = 0;
 745         fs->first_pass_bbmap = 0;
 746         fs->curr_inode_no = 0;
 747         fs->curr_blkno = 0;
 748 }
 749
 750 /*
 751  * Write data to filesystem blocks. Uses same optimization for
 752  * contigous sectors as ext4fs_read_file
 753  */
 754 static int ext4fs_write_file(struct ext2_inode *file_inode,
 755                              int pos, unsigned int len, char *buf)
 756 {
 757         int i;
 758         int blockcnt;
 759         uint32_t filesize = le32_to_cpu(file_inode->size);
 760         struct ext_filesystem *fs = get_fs();
 761         int log2blksz = fs->dev_desc->log2blksz;
 762         int log2_fs_blocksize = LOG2_BLOCK_SIZE(ext4fs_root) - log2blksz;
 763         int previous_block_number = -1;
 764         int delayed_start = 0;
 765         int delayed_extent = 0;
 766         int delayed_next = 0;
 767         char *delayed_buf = NULL;
 768
 769         /* Adjust len so it we can't read past the end of the file. */
 770         if (len > filesize)
 771                 len = filesize;
 772
 773         blockcnt = ((len + pos) + fs->blksz - 1) / fs->blksz;
 774
 775         for (i = pos / fs->blksz; i < blockcnt; i++) {
 776                 long int blknr;
 777                 int blockend = fs->blksz;
 778                 int skipfirst = 0;
 779                 blknr = read_allocated_block(file_inode, i);
 780                 if (blknr <= 0)
 781                         return -1;
 782
 783                 blknr = blknr << log2_fs_blocksize;
 784
 785                 if (blknr) {
 786                         if (previous_block_number != -1) {
 787                                 if (delayed_next == blknr) {
 788                                         delayed_extent += blockend;
 789                                         delayed_next += blockend >> log2blksz;
 790                                 } else {        /* spill */
 791                                         put_ext4((uint64_t)
 792                                                  ((uint64_t)delayed_start << log2blksz),
 793                                                  delayed_buf,
 794                                                  (uint32_t) delayed_extent);
 795                                         previous_block_number = blknr;
 796                                         delayed_start = blknr;
 797                                         delayed_extent = blockend;
 798                                         delayed_buf = buf;
 799                                         delayed_next = blknr +
 800                                             (blockend >> log2blksz);
 801                                 }
 802                         } else {
 803                                 previous_block_number = blknr;
 804                                 delayed_start = blknr;
 805                                 delayed_extent = blockend;
 806                                 delayed_buf = buf;
 807                                 delayed_next = blknr +
 808                                     (blockend >> log2blksz);
 809                         }
 810                 } else {
 811                         if (previous_block_number != -1) {
 812                                 /* spill */
 813                                 put_ext4((uint64_t) ((uint64_t)delayed_start <<
 814                                                      log2blksz),
 815                                          delayed_buf,
 816                                          (uint32_t) delayed_extent);
 817                                 previous_block_number = -1;
 818                         }
 819                         memset(buf, 0, fs->blksz - skipfirst);
 820                 }
 821                 buf += fs->blksz - skipfirst;
 822         }
 823         if (previous_block_number != -1) {
 824                 /* spill */
 825                 put_ext4((uint64_t) ((uint64_t)delayed_start << log2blksz),
 826                          delayed_buf, (uint32_t) delayed_extent);
 827                 previous_block_number = -1;
 828         }
 829
 830         return len;
 831 }
 832
 833 int ext4fs_write(const char *fname, unsigned char *buffer,
 834                                         unsigned long sizebytes)
 835 {
 836         int ret = 0;
 837         struct ext2_inode *file_inode = NULL;
 838         unsigned char *inode_buffer = NULL;
 839         int parent_inodeno;
 840         int inodeno;
 841         time_t timestamp = 0;
 842
 843         uint64_t bytes_reqd_for_file;
 844         unsigned int blks_reqd_for_file;
 845         unsigned int blocks_remaining;
 846         int existing_file_inodeno;
 847         char *temp_ptr = NULL;
 848         long int itable_blkno;
 849         long int parent_itable_blkno;
 850         long int blkoff;
 851         struct ext2_sblock *sblock = &(ext4fs_root->sblock);
 852         unsigned int inodes_per_block;
 853         unsigned int ibmap_idx;
 854         struct ext2_block_group *bgd = NULL;
 855         struct ext_filesystem *fs = get_fs();
 856         ALLOC_CACHE_ALIGN_BUFFER(char, filename, 256);
 857         memset(filename, 0x00, 256);
 858
 859         g_parent_inode = zalloc(fs->inodesz);
 860         if (!g_parent_inode)
 861                 goto fail;
 862
 863         if (ext4fs_init() != 0) {
 864                 printf("error in File System init\n");
 865                 return -1;
 866         }
 867
 868         if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) {
 869                 printf("Unsupported feature metadata_csum found, not writing.\n");
 870                 return -1;
 871         }
 872
 873         inodes_per_block = fs->blksz / fs->inodesz;
 874         parent_inodeno = ext4fs_get_parent_inode_num(fname, filename, F_FILE);
 875         if (parent_inodeno == -1)
 876                 goto fail;
 877         if (ext4fs_iget(parent_inodeno, g_parent_inode))
 878                 goto fail;
 879         /* do not mess up a directory using hash trees */
 880         if (le32_to_cpu(g_parent_inode->flags) & EXT4_INDEX_FL) {
 881                 printf("hash tree directory\n");
 882                 goto fail;
 883         }
 884         /* check if the filename is already present in root */
 885         existing_file_inodeno = ext4fs_filename_unlink(filename);
 886         if (existing_file_inodeno != -1) {
 887                 ret = ext4fs_delete_file(existing_file_inodeno);
 888                 fs->first_pass_bbmap = 0;
 889                 fs->curr_blkno = 0;
 890
 891                 fs->first_pass_ibmap = 0;
 892                 fs->curr_inode_no = 0;
 893                 if (ret)
 894                         goto fail;
 895         }
 896         /* calucalate how many blocks required */
 897         bytes_reqd_for_file = sizebytes;
 898         blks_reqd_for_file = lldiv(bytes_reqd_for_file, fs->blksz);
 899         if (do_div(bytes_reqd_for_file, fs->blksz) != 0) {
 900                 blks_reqd_for_file++;
 901                 debug("total bytes for a file %u\n", blks_reqd_for_file);
 902         }
 903         blocks_remaining = blks_reqd_for_file;
 904         /* test for available space in partition */
 905         if (le32_to_cpu(fs->sb->free_blocks) < blks_reqd_for_file) {
 906                 printf("Not enough space on partition !!!\n");
 907                 goto fail;
 908         }
 909
 910         inodeno = ext4fs_update_parent_dentry(filename, FILETYPE_REG);
 911         if (inodeno == -1)
 912                 goto fail;
 913         /* prepare file inode */
 914         inode_buffer = zalloc(fs->inodesz);
 915         if (!inode_buffer)
 916                 goto fail;
 917         file_inode = (struct ext2_inode *)inode_buffer;
 918         file_inode->mode = cpu_to_le16(S_IFREG | S_IRWXU |
 919             S_IRGRP | S_IROTH | S_IXGRP | S_IXOTH);
 920         /* ToDo: Update correct time */
 921         file_inode->mtime = cpu_to_le32(timestamp);
 922         file_inode->atime = cpu_to_le32(timestamp);
 923         file_inode->ctime = cpu_to_le32(timestamp);
 924         file_inode->nlinks = cpu_to_le16(1);
 925         file_inode->size = cpu_to_le32(sizebytes);
 926
 927         /* Allocate data blocks */
 928         ext4fs_allocate_blocks(file_inode, blocks_remaining,
 929                                &blks_reqd_for_file);
 930         file_inode->blockcnt = cpu_to_le32((blks_reqd_for_file * fs->blksz) >>
 931                 fs->dev_desc->log2blksz);
 932
 933         temp_ptr = zalloc(fs->blksz);
 934         if (!temp_ptr)
 935                 goto fail;
 936         ibmap_idx = inodeno / le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
 937         inodeno--;
 938         bgd = ext4fs_get_group_descriptor(fs, ibmap_idx);
 939         itable_blkno = ext4fs_bg_get_inode_table_id(bgd, fs) +
 940                         (inodeno % le32_to_cpu(sblock->inodes_per_group)) /
 941                         inodes_per_block;
 942         blkoff = (inodeno % inodes_per_block) * fs->inodesz;
 943         ext4fs_devread((lbaint_t)itable_blkno * fs->sect_perblk, 0, fs->blksz,
 944                        temp_ptr);
 945         if (ext4fs_log_journal(temp_ptr, itable_blkno))
 946                 goto fail;
 947
 948         memcpy(temp_ptr + blkoff, inode_buffer, fs->inodesz);
 949         if (ext4fs_put_metadata(temp_ptr, itable_blkno))
 950                 goto fail;
 951         /* copy the file content into data blocks */
 952         if (ext4fs_write_file(file_inode, 0, sizebytes, (char *)buffer) == -1) {
 953                 printf("Error in copying content\n");
 954                 /* FIXME: Deallocate data blocks */
 955                 goto fail;
 956         }
 957         ibmap_idx = parent_inodeno / le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
 958         parent_inodeno--;
 959         bgd = ext4fs_get_group_descriptor(fs, ibmap_idx);
 960         parent_itable_blkno = ext4fs_bg_get_inode_table_id(bgd, fs) +
 961             (parent_inodeno %
 962              le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
 963         blkoff = (parent_inodeno % inodes_per_block) * fs->inodesz;
 964         if (parent_itable_blkno != itable_blkno) {
 965                 memset(temp_ptr, '\0', fs->blksz);
 966                 ext4fs_devread((lbaint_t)parent_itable_blkno * fs->sect_perblk,
 967                                0, fs->blksz, temp_ptr);
 968                 if (ext4fs_log_journal(temp_ptr, parent_itable_blkno))
 969                         goto fail;
 970
 971                 memcpy(temp_ptr + blkoff, g_parent_inode, fs->inodesz);
 972                 if (ext4fs_put_metadata(temp_ptr, parent_itable_blkno))
 973                         goto fail;
 974         } else {
 975                 /*
 976                  * If parent and child fall in same inode table block
 977                  * both should be kept in 1 buffer
 978                  */
 979                 memcpy(temp_ptr + blkoff, g_parent_inode, fs->inodesz);
 980                 gd_index--;
 981                 if (ext4fs_put_metadata(temp_ptr, itable_blkno))
 982                         goto fail;
 983         }
 984         ext4fs_update();
 985         ext4fs_deinit();
 986
 987         fs->first_pass_bbmap = 0;
 988         fs->curr_blkno = 0;
 989         fs->first_pass_ibmap = 0;
 990         fs->curr_inode_no = 0;
 991         free(inode_buffer);
 992         free(g_parent_inode);
 993         free(temp_ptr);
 994         g_parent_inode = NULL;
 995
 996         return 0;
 997 fail:
 998         ext4fs_deinit();
 999         free(inode_buffer);
1000         free(g_parent_inode);
1001         free(temp_ptr);
1002         g_parent_inode = NULL;
1003
1004         return -1;
1005 }
1006
1007 int ext4_write_file(const char *filename, void *buf, loff_t offset,
1008                     loff_t len, loff_t *actwrite)
1009 {
1010         int ret;
1011
1012         if (offset != 0) {
1013                 printf("** Cannot support non-zero offset **\n");
1014                 return -1;
1015         }
1016
1017         ret = ext4fs_write(filename, buf, len);
1018         if (ret) {
1019                 printf("** Error ext4fs_write() **\n");
1020                 goto fail;
1021         }
1022
1023         *actwrite = len;
1024
1025         return 0;
1026
1027 fail:
1028         *actwrite = 0;
1029
1030         return -1;
1031 }