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