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                 struct ext2fs_node *node_inode =
 451                     zalloc(sizeof(struct ext2fs_node));
 452                 if (!node_inode)
 453                         goto fail;
 454                 node_inode->data = ext4fs_root;
 455                 node_inode->ino = inodeno;
 456                 node_inode->inode_read = 0;
 457                 memcpy(&(node_inode->inode), &inode, sizeof(struct ext2_inode));
 458
 459                 for (i = 0; i < no_blocks; i++) {
 460                         blknr = read_allocated_block(&(node_inode->inode), i);
 461                         bg_idx = blknr / blk_per_grp;
 462                         if (fs->blksz == 1024) {
 463                                 remainder = blknr % blk_per_grp;
 464                                 if (!remainder)
 465                                         bg_idx--;
 466                         }
 467                         ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx],
 468                                                 bg_idx);
 469                         debug("EXT4_EXTENTS Block releasing %ld: %d\n",
 470                               blknr, bg_idx);
 471
 472                         ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 473                         ext4fs_sb_free_blocks_inc(fs->sb);
 474
 475                         /* journal backup */
 476                         if (prev_bg_bmap_idx != bg_idx) {
 477                                 status =
 478                                     ext4fs_devread(
 479                                                    (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) *
 480                                                    fs->sect_perblk, 0,
 481                                                    fs->blksz, journal_buffer);
 482                                 if (status == 0)
 483                                         goto fail;
 484                                 if (ext4fs_log_journal(journal_buffer,
 485                                                         le32_to_cpu(bgd[bg_idx].block_id)))
 486                                         goto fail;
 487                                 prev_bg_bmap_idx = bg_idx;
 488                         }
 489                 }
 490                 if (node_inode) {
 491                         free(node_inode);
 492                         node_inode = NULL;
 493                 }
 494         } else {
 495
 496                 delete_single_indirect_block(&inode);
 497                 delete_double_indirect_block(&inode);
 498                 delete_triple_indirect_block(&inode);
 499
 500                 /* read the block no allocated to a file */
 501                 no_blocks = le32_to_cpu(inode.size) / fs->blksz;
 502                 if (le32_to_cpu(inode.size) % fs->blksz)
 503                         no_blocks++;
 504                 for (i = 0; i < no_blocks; i++) {
 505                         blknr = read_allocated_block(&inode, i);
 506                         bg_idx = blknr / blk_per_grp;
 507                         if (fs->blksz == 1024) {
 508                                 remainder = blknr % blk_per_grp;
 509                                 if (!remainder)
 510                                         bg_idx--;
 511                         }
 512                         ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx],
 513                                                 bg_idx);
 514                         debug("ActualB releasing %ld: %d\n", blknr, bg_idx);
 515
 516                         ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 517                         ext4fs_sb_free_blocks_inc(fs->sb);
 518                         /* journal backup */
 519                         if (prev_bg_bmap_idx != bg_idx) {
 520                                 memset(journal_buffer, '\0', fs->blksz);
 521                                 status = ext4fs_devread(
 522                                                         (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id)
 523                                                         * fs->sect_perblk,
 524                                                         0, fs->blksz,
 525                                                         journal_buffer);
 526                                 if (status == 0)
 527                                         goto fail;
 528                                 if (ext4fs_log_journal(journal_buffer,
 529                                                 le32_to_cpu(bgd[bg_idx].block_id)))
 530                                         goto fail;
 531                                 prev_bg_bmap_idx = bg_idx;
 532                         }
 533                 }
 534         }
 535
 536         /* from the inode no to blockno */
 537         inodes_per_block = fs->blksz / fs->inodesz;
 538         ibmap_idx = inodeno / inode_per_grp;
 539
 540         /* get the block no */
 541         inodeno--;
 542         blkno = le32_to_cpu(bgd[ibmap_idx].inode_table_id) +
 543                 (inodeno % inode_per_grp) / inodes_per_block;
 544
 545         /* get the offset of the inode */
 546         blkoff = ((inodeno) % inodes_per_block) * fs->inodesz;
 547
 548         /* read the block no containing the inode */
 549         read_buffer = zalloc(fs->blksz);
 550         if (!read_buffer)
 551                 goto fail;
 552         start_block_address = read_buffer;
 553         status = ext4fs_devread((lbaint_t)blkno * fs->sect_perblk,
 554                                 0, fs->blksz, read_buffer);
 555         if (status == 0)
 556                 goto fail;
 557
 558         if (ext4fs_log_journal(read_buffer, blkno))
 559                 goto fail;
 560
 561         read_buffer = read_buffer + blkoff;
 562         inode_buffer = (struct ext2_inode *)read_buffer;
 563         memset(inode_buffer, '\0', sizeof(struct ext2_inode));
 564
 565         /* write the inode to original position in inode table */
 566         if (ext4fs_put_metadata(start_block_address, blkno))
 567                 goto fail;
 568
 569         /* update the respective inode bitmaps */
 570         inodeno++;
 571         ext4fs_reset_inode_bmap(inodeno, fs->inode_bmaps[ibmap_idx], ibmap_idx);
 572         ext4fs_bg_free_inodes_inc(&bgd[ibmap_idx]);
 573         ext4fs_sb_free_inodes_inc(fs->sb);
 574         /* journal backup */
 575         memset(journal_buffer, '\0', fs->blksz);
 576         status = ext4fs_devread((lbaint_t)le32_to_cpu(bgd[ibmap_idx].inode_id) *
 577                                 fs->sect_perblk, 0, fs->blksz, journal_buffer);
 578         if (status == 0)
 579                 goto fail;
 580         if (ext4fs_log_journal(journal_buffer, le32_to_cpu(bgd[ibmap_idx].inode_id)))
 581                 goto fail;
 582
 583         ext4fs_update();
 584         ext4fs_deinit();
 585         ext4fs_reinit_global();
 586
 587         if (ext4fs_init() != 0) {
 588                 printf("error in File System init\n");
 589                 goto fail;
 590         }
 591
 592         free(start_block_address);
 593         free(journal_buffer);
 594
 595         return 0;
 596 fail:
 597         free(start_block_address);
 598         free(journal_buffer);
 599
 600         return -1;
 601 }
 602
 603 int ext4fs_init(void)
 604 {
 605         short status;
 606         int i;
 607         uint32_t real_free_blocks = 0;
 608         struct ext_filesystem *fs = get_fs();
 609
 610         /* populate fs */
 611         fs->blksz = EXT2_BLOCK_SIZE(ext4fs_root);
 612         fs->inodesz = INODE_SIZE_FILESYSTEM(ext4fs_root);
 613         fs->sect_perblk = fs->blksz >> fs->dev_desc->log2blksz;
 614
 615         /* get the superblock */
 616         fs->sb = zalloc(SUPERBLOCK_SIZE);
 617         if (!fs->sb)
 618                 return -ENOMEM;
 619         if (!ext4_read_superblock((char *)fs->sb))
 620                 goto fail;
 621
 622         /* init journal */
 623         if (ext4fs_init_journal())
 624                 goto fail;
 625
 626         /* get total no of blockgroups */
 627         fs->no_blkgrp = (uint32_t)ext4fs_div_roundup(
 628                         le32_to_cpu(ext4fs_root->sblock.total_blocks)
 629                         - le32_to_cpu(ext4fs_root->sblock.first_data_block),
 630                         le32_to_cpu(ext4fs_root->sblock.blocks_per_group));
 631
 632         /* get the block group descriptor table */
 633         fs->gdtable_blkno = ((EXT2_MIN_BLOCK_SIZE == fs->blksz) + 1);
 634         if (ext4fs_get_bgdtable() == -1) {
 635                 printf("Error in getting the block group descriptor table\n");
 636                 goto fail;
 637         }
 638         fs->bgd = (struct ext2_block_group *)fs->gdtable;
 639
 640         /* load all the available bitmap block of the partition */
 641         fs->blk_bmaps = zalloc(fs->no_blkgrp * sizeof(char *));
 642         if (!fs->blk_bmaps)
 643                 goto fail;
 644         for (i = 0; i < fs->no_blkgrp; i++) {
 645                 fs->blk_bmaps[i] = zalloc(fs->blksz);
 646                 if (!fs->blk_bmaps[i])
 647                         goto fail;
 648         }
 649
 650         for (i = 0; i < fs->no_blkgrp; i++) {
 651                 status =
 652                     ext4fs_devread(
 653                                    (lbaint_t)le32_to_cpu(fs->bgd[i].block_id) *
 654                                    fs->sect_perblk, 0,
 655                                    fs->blksz, (char *)fs->blk_bmaps[i]);
 656                 if (status == 0)
 657                         goto fail;
 658         }
 659
 660         /* load all the available inode bitmap of the partition */
 661         fs->inode_bmaps = zalloc(fs->no_blkgrp * sizeof(unsigned char *));
 662         if (!fs->inode_bmaps)
 663                 goto fail;
 664         for (i = 0; i < fs->no_blkgrp; i++) {
 665                 fs->inode_bmaps[i] = zalloc(fs->blksz);
 666                 if (!fs->inode_bmaps[i])
 667                         goto fail;
 668         }
 669
 670         for (i = 0; i < fs->no_blkgrp; i++) {
 671                 status = ext4fs_devread(
 672                                         (lbaint_t)le32_to_cpu(fs->bgd[i].inode_id) *
 673                                         fs->sect_perblk,
 674                                         0, fs->blksz,
 675                                         (char *)fs->inode_bmaps[i]);
 676                 if (status == 0)
 677                         goto fail;
 678         }
 679
 680         /*
 681          * check filesystem consistency with free blocks of file system
 682          * some time we observed that superblock freeblocks does not match
 683          * with the  blockgroups freeblocks when improper
 684          * reboot of a linux kernel
 685          */
 686         for (i = 0; i < fs->no_blkgrp; i++)
 687                 real_free_blocks = real_free_blocks + le16_to_cpu(fs->bgd[i].free_blocks);
 688         if (real_free_blocks != le32_to_cpu(fs->sb->free_blocks))
 689                 fs->sb->free_blocks = cpu_to_le32(real_free_blocks);
 690
 691         return 0;
 692 fail:
 693         ext4fs_deinit();
 694
 695         return -1;
 696 }
 697
 698 void ext4fs_deinit(void)
 699 {
 700         int i;
 701         struct ext2_inode inode_journal;
 702         struct journal_superblock_t *jsb;
 703         uint32_t blknr;
 704         struct ext_filesystem *fs = get_fs();
 705         uint32_t new_feature_incompat;
 706
 707         /* free journal */
 708         char *temp_buff = zalloc(fs->blksz);
 709         if (temp_buff) {
 710                 ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO,
 711                                   &inode_journal);
 712                 blknr = read_allocated_block(&inode_journal,
 713                                         EXT2_JOURNAL_SUPERBLOCK);
 714                 ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, fs->blksz,
 715                                temp_buff);
 716                 jsb = (struct journal_superblock_t *)temp_buff;
 717                 jsb->s_start = 0;
 718                 put_ext4((uint64_t) ((uint64_t)blknr * (uint64_t)fs->blksz),
 719                          (struct journal_superblock_t *)temp_buff, fs->blksz);
 720                 free(temp_buff);
 721         }
 722         ext4fs_free_journal();
 723
 724         /* get the superblock */
 725         ext4_read_superblock((char *)fs->sb);
 726         new_feature_incompat = le32_to_cpu(fs->sb->feature_incompat);
 727         new_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
 728         fs->sb->feature_incompat = cpu_to_le32(new_feature_incompat);
 729         put_ext4((uint64_t)(SUPERBLOCK_SIZE),
 730                  (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
 731         free(fs->sb);
 732         fs->sb = NULL;
 733
 734         if (fs->blk_bmaps) {
 735                 for (i = 0; i < fs->no_blkgrp; i++) {
 736                         free(fs->blk_bmaps[i]);
 737                         fs->blk_bmaps[i] = NULL;
 738                 }
 739                 free(fs->blk_bmaps);
 740                 fs->blk_bmaps = NULL;
 741         }
 742
 743         if (fs->inode_bmaps) {
 744                 for (i = 0; i < fs->no_blkgrp; i++) {
 745                         free(fs->inode_bmaps[i]);
 746                         fs->inode_bmaps[i] = NULL;
 747                 }
 748                 free(fs->inode_bmaps);
 749                 fs->inode_bmaps = NULL;
 750         }
 751
 752
 753         free(fs->gdtable);
 754         fs->gdtable = NULL;
 755         fs->bgd = NULL;
 756         /*
 757          * reinitiliazed the global inode and
 758          * block bitmap first execution check variables
 759          */
 760         fs->first_pass_ibmap = 0;
 761         fs->first_pass_bbmap = 0;
 762         fs->curr_inode_no = 0;
 763         fs->curr_blkno = 0;
 764 }
 765
 766 static int ext4fs_write_file(struct ext2_inode *file_inode,
 767                              int pos, unsigned int len, char *buf)
 768 {
 769         int i;
 770         int blockcnt;
 771         uint32_t filesize = le32_to_cpu(file_inode->size);
 772         struct ext_filesystem *fs = get_fs();
 773         int log2blksz = fs->dev_desc->log2blksz;
 774         int log2_fs_blocksize = LOG2_BLOCK_SIZE(ext4fs_root) - log2blksz;
 775         int previous_block_number = -1;
 776         int delayed_start = 0;
 777         int delayed_extent = 0;
 778         int delayed_next = 0;
 779         char *delayed_buf = NULL;
 780
 781         /* Adjust len so it we can't read past the end of the file. */
 782         if (len > filesize)
 783                 len = filesize;
 784
 785         blockcnt = ((len + pos) + fs->blksz - 1) / fs->blksz;
 786
 787         for (i = pos / fs->blksz; i < blockcnt; i++) {
 788                 long int blknr;
 789                 int blockend = fs->blksz;
 790                 int skipfirst = 0;
 791                 blknr = read_allocated_block(file_inode, i);
 792                 if (blknr < 0)
 793                         return -1;
 794
 795                 blknr = blknr << log2_fs_blocksize;
 796
 797                 if (blknr) {
 798                         if (previous_block_number != -1) {
 799                                 if (delayed_next == blknr) {
 800                                         delayed_extent += blockend;
 801                                         delayed_next += blockend >> log2blksz;
 802                                 } else {        /* spill */
 803                                         put_ext4((uint64_t)
 804                                                  ((uint64_t)delayed_start << log2blksz),
 805                                                  delayed_buf,
 806                                                  (uint32_t) delayed_extent);
 807                                         previous_block_number = blknr;
 808                                         delayed_start = blknr;
 809                                         delayed_extent = blockend;
 810                                         delayed_buf = buf;
 811                                         delayed_next = blknr +
 812                                             (blockend >> log2blksz);
 813                                 }
 814                         } else {
 815                                 previous_block_number = blknr;
 816                                 delayed_start = blknr;
 817                                 delayed_extent = blockend;
 818                                 delayed_buf = buf;
 819                                 delayed_next = blknr +
 820                                     (blockend >> log2blksz);
 821                         }
 822                 } else {
 823                         if (previous_block_number != -1) {
 824                                 /* spill */
 825                                 put_ext4((uint64_t) ((uint64_t)delayed_start <<
 826                                                      log2blksz),
 827                                          delayed_buf,
 828                                          (uint32_t) delayed_extent);
 829                                 previous_block_number = -1;
 830                         }
 831                         memset(buf, 0, fs->blksz - skipfirst);
 832                 }
 833                 buf += fs->blksz - skipfirst;
 834         }
 835         if (previous_block_number != -1) {
 836                 /* spill */
 837                 put_ext4((uint64_t) ((uint64_t)delayed_start << log2blksz),
 838                          delayed_buf, (uint32_t) delayed_extent);
 839                 previous_block_number = -1;
 840         }
 841
 842         return len;
 843 }
 844
 845 int ext4fs_write(const char *fname, unsigned char *buffer,
 846                                         unsigned long sizebytes)
 847 {
 848         int ret = 0;
 849         struct ext2_inode *file_inode = NULL;
 850         unsigned char *inode_buffer = NULL;
 851         int parent_inodeno;
 852         int inodeno;
 853         time_t timestamp = 0;
 854
 855         uint64_t bytes_reqd_for_file;
 856         unsigned int blks_reqd_for_file;
 857         unsigned int blocks_remaining;
 858         int existing_file_inodeno;
 859         char *temp_ptr = NULL;
 860         long int itable_blkno;
 861         long int parent_itable_blkno;
 862         long int blkoff;
 863         struct ext2_sblock *sblock = &(ext4fs_root->sblock);
 864         unsigned int inodes_per_block;
 865         unsigned int ibmap_idx;
 866         struct ext_filesystem *fs = get_fs();
 867         ALLOC_CACHE_ALIGN_BUFFER(char, filename, 256);
 868         memset(filename, 0x00, 256);
 869
 870         g_parent_inode = zalloc(sizeof(struct ext2_inode));
 871         if (!g_parent_inode)
 872                 goto fail;
 873
 874         if (ext4fs_init() != 0) {
 875                 printf("error in File System init\n");
 876                 return -1;
 877         }
 878         inodes_per_block = fs->blksz / fs->inodesz;
 879         parent_inodeno = ext4fs_get_parent_inode_num(fname, filename, F_FILE);
 880         if (parent_inodeno == -1)
 881                 goto fail;
 882         if (ext4fs_iget(parent_inodeno, g_parent_inode))
 883                 goto fail;
 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         itable_blkno = le32_to_cpu(fs->bgd[ibmap_idx].inode_table_id) +
 939                         (inodeno % le32_to_cpu(sblock->inodes_per_group)) /
 940                         inodes_per_block;
 941         blkoff = (inodeno % inodes_per_block) * fs->inodesz;
 942         ext4fs_devread((lbaint_t)itable_blkno * fs->sect_perblk, 0, fs->blksz,
 943                        temp_ptr);
 944         if (ext4fs_log_journal(temp_ptr, itable_blkno))
 945                 goto fail;
 946
 947         memcpy(temp_ptr + blkoff, inode_buffer, fs->inodesz);
 948         if (ext4fs_put_metadata(temp_ptr, itable_blkno))
 949                 goto fail;
 950         /* copy the file content into data blocks */
 951         if (ext4fs_write_file(file_inode, 0, sizebytes, (char *)buffer) == -1) {
 952                 printf("Error in copying content\n");
 953                 goto fail;
 954         }
 955         ibmap_idx = parent_inodeno / le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
 956         parent_inodeno--;
 957         parent_itable_blkno = le32_to_cpu(fs->bgd[ibmap_idx].inode_table_id) +
 958             (parent_inodeno %
 959              le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
 960         blkoff = (parent_inodeno % inodes_per_block) * fs->inodesz;
 961         if (parent_itable_blkno != itable_blkno) {
 962                 memset(temp_ptr, '\0', fs->blksz);
 963                 ext4fs_devread((lbaint_t)parent_itable_blkno * fs->sect_perblk,
 964                                0, fs->blksz, temp_ptr);
 965                 if (ext4fs_log_journal(temp_ptr, parent_itable_blkno))
 966                         goto fail;
 967
 968                 memcpy(temp_ptr + blkoff, g_parent_inode,
 969                         sizeof(struct ext2_inode));
 970                 if (ext4fs_put_metadata(temp_ptr, parent_itable_blkno))
 971                         goto fail;
 972                 free(temp_ptr);
 973         } else {
 974                 /*
 975                  * If parent and child fall in same inode table block
 976                  * both should be kept in 1 buffer
 977                  */
 978                 memcpy(temp_ptr + blkoff, g_parent_inode,
 979                        sizeof(struct ext2_inode));
 980                 gd_index--;
 981                 if (ext4fs_put_metadata(temp_ptr, itable_blkno))
 982                         goto fail;
 983                 free(temp_ptr);
 984         }
 985         ext4fs_update();
 986         ext4fs_deinit();
 987
 988         fs->first_pass_bbmap = 0;
 989         fs->curr_blkno = 0;
 990         fs->first_pass_ibmap = 0;
 991         fs->curr_inode_no = 0;
 992         free(inode_buffer);
 993         free(g_parent_inode);
 994         g_parent_inode = NULL;
 995
 996         return 0;
 997 fail:
 998         ext4fs_deinit();
 999         free(inode_buffer);
1000         free(g_parent_inode);
1001         g_parent_inode = NULL;
1002
1003         return -1;
1004 }
1005
1006 int ext4_write_file(const char *filename, void *buf, loff_t offset,
1007                     loff_t len, loff_t *actwrite)
1008 {
1009         int ret;
1010
1011         if (offset != 0) {
1012                 printf("** Cannot support non-zero offset **\n");
1013                 return -1;
1014         }
1015
1016         ret = ext4fs_write(filename, buf, len);
1017         if (ret) {
1018                 printf("** Error ext4fs_write() **\n");
1019                 goto fail;
1020         }
1021
1022         *actwrite = len;
1023
1024         return 0;
1025
1026 fail:
1027         *actwrite = 0;
1028
1029         return -1;
1030 }