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

   1 /*
   2  * (C) Copyright 2011 - 2012 Samsung Electronics
   3  * EXT4 filesystem implementation in Uboot by
   4  * Uma Shankar <uma.shankar@samsung.com>
   5  * Manjunatha C Achar <a.manjunatha@samsung.com>
   6  *
   7  * ext4ls and ext4load : Based on ext2 ls and load support in Uboot.
   8  *                     Ext4 read optimization taken from Open-Moko
   9  *                     Qi bootloader
  10  *
  11  * (C) Copyright 2004
  12  * esd gmbh <www.esd-electronics.com>
  13  * Reinhard Arlt <reinhard.arlt@esd-electronics.com>
  14  *
  15  * based on code from grub2 fs/ext2.c and fs/fshelp.c by
  16  * GRUB  --  GRand Unified Bootloader
  17  * Copyright (C) 2003, 2004  Free Software Foundation, Inc.
  18  *
  19  * ext4write : Based on generic ext4 protocol.
  20  *
  21  * SPDX-License-Identifier:     GPL-2.0+
  22  */
  23
  24
  25 #include <common.h>
  26 #include <memalign.h>
  27 #include <linux/stat.h>
  28 #include <div64.h>
  29 #include "ext4_common.h"
  30
  31 static inline void ext4fs_sb_free_inodes_inc(struct ext2_sblock *sb)
  32 {
  33         sb->free_inodes = cpu_to_le32(le32_to_cpu(sb->free_inodes) + 1);
  34 }
  35
  36 static inline void ext4fs_sb_free_blocks_inc(struct ext2_sblock *sb)
  37 {
  38         sb->free_blocks = cpu_to_le32(le32_to_cpu(sb->free_blocks) + 1);
  39 }
  40
  41 static inline void ext4fs_bg_free_inodes_inc(struct ext2_block_group *bg)
  42 {
  43         bg->free_inodes = cpu_to_le16(le16_to_cpu(bg->free_inodes) + 1);
  44 }
  45
  46 static inline void ext4fs_bg_free_blocks_inc(struct ext2_block_group *bg)
  47 {
  48         bg->free_blocks = cpu_to_le16(le16_to_cpu(bg->free_blocks) + 1);
  49 }
  50
  51 static void ext4fs_update(void)
  52 {
  53         short i;
  54         ext4fs_update_journal();
  55         struct ext_filesystem *fs = get_fs();
  56
  57         /* update  super block */
  58         put_ext4((uint64_t)(SUPERBLOCK_SIZE),
  59                  (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
  60
  61         /* update block groups */
  62         for (i = 0; i < fs->no_blkgrp; i++) {
  63                 fs->bgd[i].bg_checksum = cpu_to_le16(ext4fs_checksum_update(i));
  64                 put_ext4((uint64_t)le32_to_cpu(fs->bgd[i].block_id) * fs->blksz,
  65                          fs->blk_bmaps[i], fs->blksz);
  66         }
  67
  68         /* update inode table groups */
  69         for (i = 0; i < fs->no_blkgrp; i++) {
  70                 put_ext4((uint64_t)le32_to_cpu(fs->bgd[i].inode_id) * fs->blksz,
  71                          fs->inode_bmaps[i], fs->blksz);
  72         }
  73
  74         /* update the block group descriptor table */
  75         put_ext4((uint64_t)((uint64_t)fs->gdtable_blkno * (uint64_t)fs->blksz),
  76                  (struct ext2_block_group *)fs->gdtable,
  77                  (fs->blksz * fs->no_blk_pergdt));
  78
  79         ext4fs_dump_metadata();
  80
  81         gindex = 0;
  82         gd_index = 0;
  83 }
  84
  85 int ext4fs_get_bgdtable(void)
  86 {
  87         int status;
  88         int grp_desc_size;
  89         struct ext_filesystem *fs = get_fs();
  90         grp_desc_size = sizeof(struct ext2_block_group);
  91         fs->no_blk_pergdt = (fs->no_blkgrp * grp_desc_size) / fs->blksz;
  92         if ((fs->no_blkgrp * grp_desc_size) % fs->blksz)
  93                 fs->no_blk_pergdt++;
  94
  95         /* allocate memory for gdtable */
  96         fs->gdtable = zalloc(fs->blksz * fs->no_blk_pergdt);
  97         if (!fs->gdtable)
  98                 return -ENOMEM;
  99         /* read the group descriptor table */
 100         status = ext4fs_devread((lbaint_t)fs->gdtable_blkno * fs->sect_perblk,
 101                                 0, fs->blksz * fs->no_blk_pergdt, fs->gdtable);
 102         if (status == 0)
 103                 goto fail;
 104
 105         if (ext4fs_log_gdt(fs->gdtable)) {
 106                 printf("Error in ext4fs_log_gdt\n");
 107                 return -1;
 108         }
 109
 110         return 0;
 111 fail:
 112         free(fs->gdtable);
 113         fs->gdtable = NULL;
 114
 115         return -1;
 116 }
 117
 118 static void delete_single_indirect_block(struct ext2_inode *inode)
 119 {
 120         struct ext2_block_group *bgd = NULL;
 121         static int prev_bg_bmap_idx = -1;
 122         uint32_t blknr;
 123         int remainder;
 124         int bg_idx;
 125         int status;
 126         uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 127         struct ext_filesystem *fs = get_fs();
 128         char *journal_buffer = zalloc(fs->blksz);
 129         if (!journal_buffer) {
 130                 printf("No memory\n");
 131                 return;
 132         }
 133         /* get  block group descriptor table */
 134         bgd = (struct ext2_block_group *)fs->gdtable;
 135
 136         /* deleting the single indirect block associated with inode */
 137         if (inode->b.blocks.indir_block != 0) {
 138                 blknr = le32_to_cpu(inode->b.blocks.indir_block);
 139                 debug("SIPB releasing %u\n", blknr);
 140                 bg_idx = blknr / blk_per_grp;
 141                 if (fs->blksz == 1024) {
 142                         remainder = blknr % blk_per_grp;
 143                         if (!remainder)
 144                                 bg_idx--;
 145                 }
 146                 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
 147                 ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 148                 ext4fs_sb_free_blocks_inc(fs->sb);
 149                 /* journal backup */
 150                 if (prev_bg_bmap_idx != bg_idx) {
 151                         status = ext4fs_devread(
 152                                            (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) *
 153                                            fs->sect_perblk, 0, fs->blksz,
 154                                            journal_buffer);
 155                         if (status == 0)
 156                                 goto fail;
 157                         if (ext4fs_log_journal
 158                             (journal_buffer, le32_to_cpu(bgd[bg_idx].block_id)))
 159                                 goto fail;
 160                         prev_bg_bmap_idx = bg_idx;
 161                 }
 162         }
 163 fail:
 164         free(journal_buffer);
 165 }
 166
 167 static void delete_double_indirect_block(struct ext2_inode *inode)
 168 {
 169         int i;
 170         short status;
 171         static int prev_bg_bmap_idx = -1;
 172         uint32_t blknr;
 173         int remainder;
 174         int bg_idx;
 175         uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 176         __le32 *di_buffer = NULL;
 177         void *dib_start_addr = NULL;
 178         struct ext2_block_group *bgd = NULL;
 179         struct ext_filesystem *fs = get_fs();
 180         char *journal_buffer = zalloc(fs->blksz);
 181         if (!journal_buffer) {
 182                 printf("No memory\n");
 183                 return;
 184         }
 185         /* get the block group descriptor table */
 186         bgd = (struct ext2_block_group *)fs->gdtable;
 187
 188         if (inode->b.blocks.double_indir_block != 0) {
 189                 di_buffer = zalloc(fs->blksz);
 190                 if (!di_buffer) {
 191                         printf("No memory\n");
 192                         return;
 193                 }
 194                 dib_start_addr = di_buffer;
 195                 blknr = le32_to_cpu(inode->b.blocks.double_indir_block);
 196                 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
 197                                         fs->blksz, (char *)di_buffer);
 198                 for (i = 0; i < fs->blksz / sizeof(int); i++) {
 199                         if (*di_buffer == 0)
 200                                 break;
 201
 202                         debug("DICB releasing %u\n", *di_buffer);
 203                         bg_idx = le32_to_cpu(*di_buffer) / blk_per_grp;
 204                         if (fs->blksz == 1024) {
 205                                 remainder = le32_to_cpu(*di_buffer) % blk_per_grp;
 206                                 if (!remainder)
 207                                         bg_idx--;
 208                         }
 209                         ext4fs_reset_block_bmap(le32_to_cpu(*di_buffer),
 210                                         fs->blk_bmaps[bg_idx], bg_idx);
 211                         di_buffer++;
 212                         ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 213                         ext4fs_sb_free_blocks_inc(fs->sb);
 214                         /* journal backup */
 215                         if (prev_bg_bmap_idx != bg_idx) {
 216                                 status = ext4fs_devread(
 217                                                         (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id)
 218                                                         * fs->sect_perblk, 0,
 219                                                         fs->blksz,
 220                                                         journal_buffer);
 221                                 if (status == 0)
 222                                         goto fail;
 223
 224                                 if (ext4fs_log_journal(journal_buffer,
 225                                                         le32_to_cpu(bgd[bg_idx].block_id)))
 226                                         goto fail;
 227                                 prev_bg_bmap_idx = bg_idx;
 228                         }
 229                 }
 230
 231                 /* removing the parent double indirect block */
 232                 blknr = le32_to_cpu(inode->b.blocks.double_indir_block);
 233                 bg_idx = blknr / blk_per_grp;
 234                 if (fs->blksz == 1024) {
 235                         remainder = blknr % blk_per_grp;
 236                         if (!remainder)
 237                                 bg_idx--;
 238                 }
 239                 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
 240                 ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 241                 ext4fs_sb_free_blocks_inc(fs->sb);
 242                 /* journal backup */
 243                 if (prev_bg_bmap_idx != bg_idx) {
 244                         memset(journal_buffer, '\0', fs->blksz);
 245                         status = ext4fs_devread((lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) *
 246                                                 fs->sect_perblk, 0, fs->blksz,
 247                                                 journal_buffer);
 248                         if (status == 0)
 249                                 goto fail;
 250
 251                         if (ext4fs_log_journal(journal_buffer,
 252                                                 le32_to_cpu(bgd[bg_idx].block_id)))
 253                                 goto fail;
 254                         prev_bg_bmap_idx = bg_idx;
 255                 }
 256                 debug("DIPB releasing %d\n", blknr);
 257         }
 258 fail:
 259         free(dib_start_addr);
 260         free(journal_buffer);
 261 }
 262
 263 static void delete_triple_indirect_block(struct ext2_inode *inode)
 264 {
 265         int i, j;
 266         short status;
 267         static int prev_bg_bmap_idx = -1;
 268         uint32_t blknr;
 269         int remainder;
 270         int bg_idx;
 271         uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 272         __le32 *tigp_buffer = NULL;
 273         void *tib_start_addr = NULL;
 274         __le32 *tip_buffer = NULL;
 275         void *tipb_start_addr = NULL;
 276         struct ext2_block_group *bgd = NULL;
 277         struct ext_filesystem *fs = get_fs();
 278         char *journal_buffer = zalloc(fs->blksz);
 279         if (!journal_buffer) {
 280                 printf("No memory\n");
 281                 return;
 282         }
 283         /* get block group descriptor table */
 284         bgd = (struct ext2_block_group *)fs->gdtable;
 285
 286         if (inode->b.blocks.triple_indir_block != 0) {
 287                 tigp_buffer = zalloc(fs->blksz);
 288                 if (!tigp_buffer) {
 289                         printf("No memory\n");
 290                         return;
 291                 }
 292                 tib_start_addr = tigp_buffer;
 293                 blknr = le32_to_cpu(inode->b.blocks.triple_indir_block);
 294                 status = ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0,
 295                                         fs->blksz, (char *)tigp_buffer);
 296                 for (i = 0; i < fs->blksz / sizeof(int); i++) {
 297                         if (*tigp_buffer == 0)
 298                                 break;
 299                         debug("tigp buffer releasing %u\n", *tigp_buffer);
 300
 301                         tip_buffer = zalloc(fs->blksz);
 302                         if (!tip_buffer)
 303                                 goto fail;
 304                         tipb_start_addr = tip_buffer;
 305                         status = ext4fs_devread((lbaint_t)le32_to_cpu(*tigp_buffer) *
 306                                                 fs->sect_perblk, 0, fs->blksz,
 307                                                 (char *)tip_buffer);
 308                         for (j = 0; j < fs->blksz / sizeof(int); j++) {
 309                                 if (le32_to_cpu(*tip_buffer) == 0)
 310                                         break;
 311                                 bg_idx = le32_to_cpu(*tip_buffer) / blk_per_grp;
 312                                 if (fs->blksz == 1024) {
 313                                         remainder = le32_to_cpu(*tip_buffer) % blk_per_grp;
 314                                         if (!remainder)
 315                                                 bg_idx--;
 316                                 }
 317
 318                                 ext4fs_reset_block_bmap(le32_to_cpu(*tip_buffer),
 319                                                         fs->blk_bmaps[bg_idx],
 320                                                         bg_idx);
 321
 322                                 tip_buffer++;
 323                                 ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 324                                 ext4fs_sb_free_blocks_inc(fs->sb);
 325                                 /* journal backup */
 326                                 if (prev_bg_bmap_idx != bg_idx) {
 327                                         status =
 328                                             ext4fs_devread(
 329                                                         (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) *
 330                                                         fs->sect_perblk, 0,
 331                                                         fs->blksz,
 332                                                         journal_buffer);
 333                                         if (status == 0)
 334                                                 goto fail;
 335
 336                                         if (ext4fs_log_journal(journal_buffer,
 337                                                                le32_to_cpu(bgd[bg_idx].block_id)))
 338                                                 goto fail;
 339                                         prev_bg_bmap_idx = bg_idx;
 340                                 }
 341                         }
 342                         free(tipb_start_addr);
 343                         tipb_start_addr = NULL;
 344
 345                         /*
 346                          * removing the grand parent blocks
 347                          * which is connected to inode
 348                          */
 349                         bg_idx = le32_to_cpu(*tigp_buffer) / blk_per_grp;
 350                         if (fs->blksz == 1024) {
 351                                 remainder = le32_to_cpu(*tigp_buffer) % blk_per_grp;
 352                                 if (!remainder)
 353                                         bg_idx--;
 354                         }
 355                         ext4fs_reset_block_bmap(le32_to_cpu(*tigp_buffer),
 356                                                 fs->blk_bmaps[bg_idx], bg_idx);
 357
 358                         tigp_buffer++;
 359                         ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 360                         ext4fs_sb_free_blocks_inc(fs->sb);
 361                         /* journal backup */
 362                         if (prev_bg_bmap_idx != bg_idx) {
 363                                 memset(journal_buffer, '\0', fs->blksz);
 364                                 status =
 365                                     ext4fs_devread(
 366                                                    (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) *
 367                                                    fs->sect_perblk, 0,
 368                                                    fs->blksz, journal_buffer);
 369                                 if (status == 0)
 370                                         goto fail;
 371
 372                                 if (ext4fs_log_journal(journal_buffer,
 373                                                         le32_to_cpu(bgd[bg_idx].block_id)))
 374                                         goto fail;
 375                                 prev_bg_bmap_idx = bg_idx;
 376                         }
 377                 }
 378
 379                 /* removing the grand parent triple indirect block */
 380                 blknr = le32_to_cpu(inode->b.blocks.triple_indir_block);
 381                 bg_idx = blknr / blk_per_grp;
 382                 if (fs->blksz == 1024) {
 383                         remainder = blknr % blk_per_grp;
 384                         if (!remainder)
 385                                 bg_idx--;
 386                 }
 387                 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx], bg_idx);
 388                 ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 389                 ext4fs_sb_free_blocks_inc(fs->sb);
 390                 /* journal backup */
 391                 if (prev_bg_bmap_idx != bg_idx) {
 392                         memset(journal_buffer, '\0', fs->blksz);
 393                         status = ext4fs_devread(
 394                                                 (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) *
 395                                                 fs->sect_perblk, 0, fs->blksz,
 396                                                 journal_buffer);
 397                         if (status == 0)
 398                                 goto fail;
 399
 400                         if (ext4fs_log_journal(journal_buffer,
 401                                                 le32_to_cpu(bgd[bg_idx].block_id)))
 402                                 goto fail;
 403                         prev_bg_bmap_idx = bg_idx;
 404                 }
 405                 debug("tigp buffer itself releasing %d\n", blknr);
 406         }
 407 fail:
 408         free(tib_start_addr);
 409         free(tipb_start_addr);
 410         free(journal_buffer);
 411 }
 412
 413 static int ext4fs_delete_file(int inodeno)
 414 {
 415         struct ext2_inode inode;
 416         short status;
 417         int i;
 418         int remainder;
 419         long int blknr;
 420         int bg_idx;
 421         int ibmap_idx;
 422         char *read_buffer = NULL;
 423         char *start_block_address = NULL;
 424         uint32_t no_blocks;
 425
 426         static int prev_bg_bmap_idx = -1;
 427         unsigned int inodes_per_block;
 428         uint32_t blkno;
 429         unsigned int blkoff;
 430         uint32_t blk_per_grp = le32_to_cpu(ext4fs_root->sblock.blocks_per_group);
 431         uint32_t inode_per_grp = le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
 432         struct ext2_inode *inode_buffer = NULL;
 433         struct ext2_block_group *bgd = NULL;
 434         struct ext_filesystem *fs = get_fs();
 435         char *journal_buffer = zalloc(fs->blksz);
 436         if (!journal_buffer)
 437                 return -ENOMEM;
 438         /* get the block group descriptor table */
 439         bgd = (struct ext2_block_group *)fs->gdtable;
 440         status = ext4fs_read_inode(ext4fs_root, inodeno, &inode);
 441         if (status == 0)
 442                 goto fail;
 443
 444         /* read the block no allocated to a file */
 445         no_blocks = le32_to_cpu(inode.size) / fs->blksz;
 446         if (le32_to_cpu(inode.size) % fs->blksz)
 447                 no_blocks++;
 448
 449         if (le32_to_cpu(inode.flags) & EXT4_EXTENTS_FL) {
 450                 /* FIXME delete extent index blocks, i.e. eh_depth >= 1 */
 451                 struct ext4_extent_header *eh =
 452                         (struct ext4_extent_header *)
 453                                 inode.b.blocks.dir_blocks;
 454                 debug("del: dep=%d entries=%d\n", eh->eh_depth, eh->eh_entries);
 455         } else {
 456                 delete_single_indirect_block(&inode);
 457                 delete_double_indirect_block(&inode);
 458                 delete_triple_indirect_block(&inode);
 459         }
 460
 461         /* release data blocks */
 462         for (i = 0; i < no_blocks; i++) {
 463                 blknr = read_allocated_block(&inode, i);
 464                 if (blknr == 0)
 465                         continue;
 466                 if (blknr < 0)
 467                         goto fail;
 468                 bg_idx = blknr / blk_per_grp;
 469                 if (fs->blksz == 1024) {
 470                         remainder = blknr % blk_per_grp;
 471                         if (!remainder)
 472                                 bg_idx--;
 473                 }
 474                 ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx],
 475                                         bg_idx);
 476                 debug("EXT4 Block releasing %ld: %d\n", blknr, bg_idx);
 477
 478                 ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
 479                 ext4fs_sb_free_blocks_inc(fs->sb);
 480                 /* journal backup */
 481                 if (prev_bg_bmap_idx != bg_idx) {
 482                         uint32_t bgd_blknr = le32_to_cpu(bgd[bg_idx].block_id);
 483                         status = ext4fs_devread((lbaint_t)bgd_blknr *
 484                                                 fs->sect_perblk,
 485                                                 0, fs->blksz,
 486                                                 journal_buffer);
 487                         if (status == 0)
 488                                 goto fail;
 489                         if (ext4fs_log_journal(journal_buffer, bgd_blknr))
 490                                 goto fail;
 491                         prev_bg_bmap_idx = bg_idx;
 492                 }
 493         }
 494
 495         /* release inode */
 496         /* from the inode no to blockno */
 497         inodes_per_block = fs->blksz / fs->inodesz;
 498         ibmap_idx = inodeno / inode_per_grp;
 499
 500         /* get the block no */
 501         inodeno--;
 502         blkno = le32_to_cpu(bgd[ibmap_idx].inode_table_id) +
 503                 (inodeno % inode_per_grp) / inodes_per_block;
 504
 505         /* get the offset of the inode */
 506         blkoff = ((inodeno) % inodes_per_block) * fs->inodesz;
 507
 508         /* read the block no containing the inode */
 509         read_buffer = zalloc(fs->blksz);
 510         if (!read_buffer)
 511                 goto fail;
 512         start_block_address = read_buffer;
 513         status = ext4fs_devread((lbaint_t)blkno * fs->sect_perblk,
 514                                 0, fs->blksz, read_buffer);
 515         if (status == 0)
 516                 goto fail;
 517
 518         if (ext4fs_log_journal(read_buffer, blkno))
 519                 goto fail;
 520
 521         read_buffer = read_buffer + blkoff;
 522         inode_buffer = (struct ext2_inode *)read_buffer;
 523         memset(inode_buffer, '\0', fs->inodesz);
 524
 525         /* write the inode to original position in inode table */
 526         if (ext4fs_put_metadata(start_block_address, blkno))
 527                 goto fail;
 528
 529         /* update the respective inode bitmaps */
 530         inodeno++;
 531         ext4fs_reset_inode_bmap(inodeno, fs->inode_bmaps[ibmap_idx], ibmap_idx);
 532         ext4fs_bg_free_inodes_inc(&bgd[ibmap_idx]);
 533         ext4fs_sb_free_inodes_inc(fs->sb);
 534         /* journal backup */
 535         memset(journal_buffer, '\0', fs->blksz);
 536         status = ext4fs_devread((lbaint_t)le32_to_cpu(bgd[ibmap_idx].inode_id) *
 537                                 fs->sect_perblk, 0, fs->blksz, journal_buffer);
 538         if (status == 0)
 539                 goto fail;
 540         if (ext4fs_log_journal(journal_buffer, le32_to_cpu(bgd[ibmap_idx].inode_id)))
 541                 goto fail;
 542
 543         ext4fs_update();
 544         ext4fs_deinit();
 545         ext4fs_reinit_global();
 546
 547         if (ext4fs_init() != 0) {
 548                 printf("error in File System init\n");
 549                 goto fail;
 550         }
 551
 552         free(start_block_address);
 553         free(journal_buffer);
 554
 555         return 0;
 556 fail:
 557         free(start_block_address);
 558         free(journal_buffer);
 559
 560         return -1;
 561 }
 562
 563 int ext4fs_init(void)
 564 {
 565         short status;
 566         int i;
 567         uint32_t real_free_blocks = 0;
 568         struct ext_filesystem *fs = get_fs();
 569
 570         /* populate fs */
 571         fs->blksz = EXT2_BLOCK_SIZE(ext4fs_root);
 572         fs->sect_perblk = fs->blksz >> fs->dev_desc->log2blksz;
 573
 574         /* get the superblock */
 575         fs->sb = zalloc(SUPERBLOCK_SIZE);
 576         if (!fs->sb)
 577                 return -ENOMEM;
 578         if (!ext4_read_superblock((char *)fs->sb))
 579                 goto fail;
 580
 581         /* init journal */
 582         if (ext4fs_init_journal())
 583                 goto fail;
 584
 585         /* get total no of blockgroups */
 586         fs->no_blkgrp = (uint32_t)ext4fs_div_roundup(
 587                         le32_to_cpu(ext4fs_root->sblock.total_blocks)
 588                         - le32_to_cpu(ext4fs_root->sblock.first_data_block),
 589                         le32_to_cpu(ext4fs_root->sblock.blocks_per_group));
 590
 591         /* get the block group descriptor table */
 592         fs->gdtable_blkno = ((EXT2_MIN_BLOCK_SIZE == fs->blksz) + 1);
 593         if (ext4fs_get_bgdtable() == -1) {
 594                 printf("Error in getting the block group descriptor table\n");
 595                 goto fail;
 596         }
 597         fs->bgd = (struct ext2_block_group *)fs->gdtable;
 598
 599         /* load all the available bitmap block of the partition */
 600         fs->blk_bmaps = zalloc(fs->no_blkgrp * sizeof(char *));
 601         if (!fs->blk_bmaps)
 602                 goto fail;
 603         for (i = 0; i < fs->no_blkgrp; i++) {
 604                 fs->blk_bmaps[i] = zalloc(fs->blksz);
 605                 if (!fs->blk_bmaps[i])
 606                         goto fail;
 607         }
 608
 609         for (i = 0; i < fs->no_blkgrp; i++) {
 610                 status =
 611                     ext4fs_devread(
 612                                    (lbaint_t)le32_to_cpu(fs->bgd[i].block_id) *
 613                                    fs->sect_perblk, 0,
 614                                    fs->blksz, (char *)fs->blk_bmaps[i]);
 615                 if (status == 0)
 616                         goto fail;
 617         }
 618
 619         /* load all the available inode bitmap of the partition */
 620         fs->inode_bmaps = zalloc(fs->no_blkgrp * sizeof(unsigned char *));
 621         if (!fs->inode_bmaps)
 622                 goto fail;
 623         for (i = 0; i < fs->no_blkgrp; i++) {
 624                 fs->inode_bmaps[i] = zalloc(fs->blksz);
 625                 if (!fs->inode_bmaps[i])
 626                         goto fail;
 627         }
 628
 629         for (i = 0; i < fs->no_blkgrp; i++) {
 630                 status = ext4fs_devread(
 631                                         (lbaint_t)le32_to_cpu(fs->bgd[i].inode_id) *
 632                                         fs->sect_perblk,
 633                                         0, fs->blksz,
 634                                         (char *)fs->inode_bmaps[i]);
 635                 if (status == 0)
 636                         goto fail;
 637         }
 638
 639         /*
 640          * check filesystem consistency with free blocks of file system
 641          * some time we observed that superblock freeblocks does not match
 642          * with the  blockgroups freeblocks when improper
 643          * reboot of a linux kernel
 644          */
 645         for (i = 0; i < fs->no_blkgrp; i++)
 646                 real_free_blocks = real_free_blocks + le16_to_cpu(fs->bgd[i].free_blocks);
 647         if (real_free_blocks != le32_to_cpu(fs->sb->free_blocks))
 648                 fs->sb->free_blocks = cpu_to_le32(real_free_blocks);
 649
 650         return 0;
 651 fail:
 652         ext4fs_deinit();
 653
 654         return -1;
 655 }
 656
 657 void ext4fs_deinit(void)
 658 {
 659         int i;
 660         struct ext2_inode inode_journal;
 661         struct journal_superblock_t *jsb;
 662         uint32_t blknr;
 663         struct ext_filesystem *fs = get_fs();
 664         uint32_t new_feature_incompat;
 665
 666         /* free journal */
 667         char *temp_buff = zalloc(fs->blksz);
 668         if (temp_buff) {
 669                 ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO,
 670                                   &inode_journal);
 671                 blknr = read_allocated_block(&inode_journal,
 672                                         EXT2_JOURNAL_SUPERBLOCK);
 673                 ext4fs_devread((lbaint_t)blknr * fs->sect_perblk, 0, fs->blksz,
 674                                temp_buff);
 675                 jsb = (struct journal_superblock_t *)temp_buff;
 676                 jsb->s_start = 0;
 677                 put_ext4((uint64_t) ((uint64_t)blknr * (uint64_t)fs->blksz),
 678                          (struct journal_superblock_t *)temp_buff, fs->blksz);
 679                 free(temp_buff);
 680         }
 681         ext4fs_free_journal();
 682
 683         /* get the superblock */
 684         ext4_read_superblock((char *)fs->sb);
 685         new_feature_incompat = le32_to_cpu(fs->sb->feature_incompat);
 686         new_feature_incompat &= ~EXT3_FEATURE_INCOMPAT_RECOVER;
 687         fs->sb->feature_incompat = cpu_to_le32(new_feature_incompat);
 688         put_ext4((uint64_t)(SUPERBLOCK_SIZE),
 689                  (struct ext2_sblock *)fs->sb, (uint32_t)SUPERBLOCK_SIZE);
 690         free(fs->sb);
 691         fs->sb = NULL;
 692
 693         if (fs->blk_bmaps) {
 694                 for (i = 0; i < fs->no_blkgrp; i++) {
 695                         free(fs->blk_bmaps[i]);
 696                         fs->blk_bmaps[i] = NULL;
 697                 }
 698                 free(fs->blk_bmaps);
 699                 fs->blk_bmaps = NULL;
 700         }
 701
 702         if (fs->inode_bmaps) {
 703                 for (i = 0; i < fs->no_blkgrp; i++) {
 704                         free(fs->inode_bmaps[i]);
 705                         fs->inode_bmaps[i] = NULL;
 706                 }
 707                 free(fs->inode_bmaps);
 708                 fs->inode_bmaps = NULL;
 709         }
 710
 711
 712         free(fs->gdtable);
 713         fs->gdtable = NULL;
 714         fs->bgd = NULL;
 715         /*
 716          * reinitiliazed the global inode and
 717          * block bitmap first execution check variables
 718          */
 719         fs->first_pass_ibmap = 0;
 720         fs->first_pass_bbmap = 0;
 721         fs->curr_inode_no = 0;
 722         fs->curr_blkno = 0;
 723 }
 724
 725 /*
 726  * Write data to filesystem blocks. Uses same optimization for
 727  * contigous sectors as ext4fs_read_file
 728  */
 729 static int ext4fs_write_file(struct ext2_inode *file_inode,
 730                              int pos, unsigned int len, char *buf)
 731 {
 732         int i;
 733         int blockcnt;
 734         uint32_t filesize = le32_to_cpu(file_inode->size);
 735         struct ext_filesystem *fs = get_fs();
 736         int log2blksz = fs->dev_desc->log2blksz;
 737         int log2_fs_blocksize = LOG2_BLOCK_SIZE(ext4fs_root) - log2blksz;
 738         int previous_block_number = -1;
 739         int delayed_start = 0;
 740         int delayed_extent = 0;
 741         int delayed_next = 0;
 742         char *delayed_buf = NULL;
 743
 744         /* Adjust len so it we can't read past the end of the file. */
 745         if (len > filesize)
 746                 len = filesize;
 747
 748         blockcnt = ((len + pos) + fs->blksz - 1) / fs->blksz;
 749
 750         for (i = pos / fs->blksz; i < blockcnt; i++) {
 751                 long int blknr;
 752                 int blockend = fs->blksz;
 753                 int skipfirst = 0;
 754                 blknr = read_allocated_block(file_inode, i);
 755                 if (blknr <= 0)
 756                         return -1;
 757
 758                 blknr = blknr << log2_fs_blocksize;
 759
 760                 if (blknr) {
 761                         if (previous_block_number != -1) {
 762                                 if (delayed_next == blknr) {
 763                                         delayed_extent += blockend;
 764                                         delayed_next += blockend >> log2blksz;
 765                                 } else {        /* spill */
 766                                         put_ext4((uint64_t)
 767                                                  ((uint64_t)delayed_start << log2blksz),
 768                                                  delayed_buf,
 769                                                  (uint32_t) delayed_extent);
 770                                         previous_block_number = blknr;
 771                                         delayed_start = blknr;
 772                                         delayed_extent = blockend;
 773                                         delayed_buf = buf;
 774                                         delayed_next = blknr +
 775                                             (blockend >> log2blksz);
 776                                 }
 777                         } else {
 778                                 previous_block_number = blknr;
 779                                 delayed_start = blknr;
 780                                 delayed_extent = blockend;
 781                                 delayed_buf = buf;
 782                                 delayed_next = blknr +
 783                                     (blockend >> log2blksz);
 784                         }
 785                 } else {
 786                         if (previous_block_number != -1) {
 787                                 /* spill */
 788                                 put_ext4((uint64_t) ((uint64_t)delayed_start <<
 789                                                      log2blksz),
 790                                          delayed_buf,
 791                                          (uint32_t) delayed_extent);
 792                                 previous_block_number = -1;
 793                         }
 794                         memset(buf, 0, fs->blksz - skipfirst);
 795                 }
 796                 buf += fs->blksz - skipfirst;
 797         }
 798         if (previous_block_number != -1) {
 799                 /* spill */
 800                 put_ext4((uint64_t) ((uint64_t)delayed_start << log2blksz),
 801                          delayed_buf, (uint32_t) delayed_extent);
 802                 previous_block_number = -1;
 803         }
 804
 805         return len;
 806 }
 807
 808 int ext4fs_write(const char *fname, unsigned char *buffer,
 809                                         unsigned long sizebytes)
 810 {
 811         int ret = 0;
 812         struct ext2_inode *file_inode = NULL;
 813         unsigned char *inode_buffer = NULL;
 814         int parent_inodeno;
 815         int inodeno;
 816         time_t timestamp = 0;
 817
 818         uint64_t bytes_reqd_for_file;
 819         unsigned int blks_reqd_for_file;
 820         unsigned int blocks_remaining;
 821         int existing_file_inodeno;
 822         char *temp_ptr = NULL;
 823         long int itable_blkno;
 824         long int parent_itable_blkno;
 825         long int blkoff;
 826         struct ext2_sblock *sblock = &(ext4fs_root->sblock);
 827         unsigned int inodes_per_block;
 828         unsigned int ibmap_idx;
 829         struct ext_filesystem *fs = get_fs();
 830         ALLOC_CACHE_ALIGN_BUFFER(char, filename, 256);
 831         memset(filename, 0x00, 256);
 832
 833         g_parent_inode = zalloc(fs->inodesz);
 834         if (!g_parent_inode)
 835                 goto fail;
 836
 837         if (ext4fs_init() != 0) {
 838                 printf("error in File System init\n");
 839                 return -1;
 840         }
 841         inodes_per_block = fs->blksz / fs->inodesz;
 842         parent_inodeno = ext4fs_get_parent_inode_num(fname, filename, F_FILE);
 843         if (parent_inodeno == -1)
 844                 goto fail;
 845         if (ext4fs_iget(parent_inodeno, g_parent_inode))
 846                 goto fail;
 847         /* do not mess up a directory using hash trees */
 848         if (le32_to_cpu(g_parent_inode->flags) & EXT4_INDEX_FL) {
 849                 printf("hash tree directory\n");
 850                 goto fail;
 851         }
 852         /* check if the filename is already present in root */
 853         existing_file_inodeno = ext4fs_filename_unlink(filename);
 854         if (existing_file_inodeno != -1) {
 855                 ret = ext4fs_delete_file(existing_file_inodeno);
 856                 fs->first_pass_bbmap = 0;
 857                 fs->curr_blkno = 0;
 858
 859                 fs->first_pass_ibmap = 0;
 860                 fs->curr_inode_no = 0;
 861                 if (ret)
 862                         goto fail;
 863         }
 864         /* calucalate how many blocks required */
 865         bytes_reqd_for_file = sizebytes;
 866         blks_reqd_for_file = lldiv(bytes_reqd_for_file, fs->blksz);
 867         if (do_div(bytes_reqd_for_file, fs->blksz) != 0) {
 868                 blks_reqd_for_file++;
 869                 debug("total bytes for a file %u\n", blks_reqd_for_file);
 870         }
 871         blocks_remaining = blks_reqd_for_file;
 872         /* test for available space in partition */
 873         if (le32_to_cpu(fs->sb->free_blocks) < blks_reqd_for_file) {
 874                 printf("Not enough space on partition !!!\n");
 875                 goto fail;
 876         }
 877
 878         inodeno = ext4fs_update_parent_dentry(filename, FILETYPE_REG);
 879         if (inodeno == -1)
 880                 goto fail;
 881         /* prepare file inode */
 882         inode_buffer = zalloc(fs->inodesz);
 883         if (!inode_buffer)
 884                 goto fail;
 885         file_inode = (struct ext2_inode *)inode_buffer;
 886         file_inode->mode = cpu_to_le16(S_IFREG | S_IRWXU |
 887             S_IRGRP | S_IROTH | S_IXGRP | S_IXOTH);
 888         /* ToDo: Update correct time */
 889         file_inode->mtime = cpu_to_le32(timestamp);
 890         file_inode->atime = cpu_to_le32(timestamp);
 891         file_inode->ctime = cpu_to_le32(timestamp);
 892         file_inode->nlinks = cpu_to_le16(1);
 893         file_inode->size = cpu_to_le32(sizebytes);
 894
 895         /* Allocate data blocks */
 896         ext4fs_allocate_blocks(file_inode, blocks_remaining,
 897                                &blks_reqd_for_file);
 898         file_inode->blockcnt = cpu_to_le32((blks_reqd_for_file * fs->blksz) >>
 899                 fs->dev_desc->log2blksz);
 900
 901         temp_ptr = zalloc(fs->blksz);
 902         if (!temp_ptr)
 903                 goto fail;
 904         ibmap_idx = inodeno / le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
 905         inodeno--;
 906         itable_blkno = le32_to_cpu(fs->bgd[ibmap_idx].inode_table_id) +
 907                         (inodeno % le32_to_cpu(sblock->inodes_per_group)) /
 908                         inodes_per_block;
 909         blkoff = (inodeno % inodes_per_block) * fs->inodesz;
 910         ext4fs_devread((lbaint_t)itable_blkno * fs->sect_perblk, 0, fs->blksz,
 911                        temp_ptr);
 912         if (ext4fs_log_journal(temp_ptr, itable_blkno))
 913                 goto fail;
 914
 915         memcpy(temp_ptr + blkoff, inode_buffer, fs->inodesz);
 916         if (ext4fs_put_metadata(temp_ptr, itable_blkno))
 917                 goto fail;
 918         /* copy the file content into data blocks */
 919         if (ext4fs_write_file(file_inode, 0, sizebytes, (char *)buffer) == -1) {
 920                 printf("Error in copying content\n");
 921                 /* FIXME: Deallocate data blocks */
 922                 goto fail;
 923         }
 924         ibmap_idx = parent_inodeno / le32_to_cpu(ext4fs_root->sblock.inodes_per_group);
 925         parent_inodeno--;
 926         parent_itable_blkno = le32_to_cpu(fs->bgd[ibmap_idx].inode_table_id) +
 927             (parent_inodeno %
 928              le32_to_cpu(sblock->inodes_per_group)) / inodes_per_block;
 929         blkoff = (parent_inodeno % inodes_per_block) * fs->inodesz;
 930         if (parent_itable_blkno != itable_blkno) {
 931                 memset(temp_ptr, '\0', fs->blksz);
 932                 ext4fs_devread((lbaint_t)parent_itable_blkno * fs->sect_perblk,
 933                                0, fs->blksz, temp_ptr);
 934                 if (ext4fs_log_journal(temp_ptr, parent_itable_blkno))
 935                         goto fail;
 936
 937                 memcpy(temp_ptr + blkoff, g_parent_inode, fs->inodesz);
 938                 if (ext4fs_put_metadata(temp_ptr, parent_itable_blkno))
 939                         goto fail;
 940         } else {
 941                 /*
 942                  * If parent and child fall in same inode table block
 943                  * both should be kept in 1 buffer
 944                  */
 945                 memcpy(temp_ptr + blkoff, g_parent_inode, fs->inodesz);
 946                 gd_index--;
 947                 if (ext4fs_put_metadata(temp_ptr, itable_blkno))
 948                         goto fail;
 949         }
 950         ext4fs_update();
 951         ext4fs_deinit();
 952
 953         fs->first_pass_bbmap = 0;
 954         fs->curr_blkno = 0;
 955         fs->first_pass_ibmap = 0;
 956         fs->curr_inode_no = 0;
 957         free(inode_buffer);
 958         free(g_parent_inode);
 959         free(temp_ptr);
 960         g_parent_inode = NULL;
 961
 962         return 0;
 963 fail:
 964         ext4fs_deinit();
 965         free(inode_buffer);
 966         free(g_parent_inode);
 967         free(temp_ptr);
 968         g_parent_inode = NULL;
 969
 970         return -1;
 971 }
 972
 973 int ext4_write_file(const char *filename, void *buf, loff_t offset,
 974                     loff_t len, loff_t *actwrite)
 975 {
 976         int ret;
 977
 978         if (offset != 0) {
 979                 printf("** Cannot support non-zero offset **\n");
 980                 return -1;
 981         }
 982
 983         ret = ext4fs_write(filename, buf, len);
 984         if (ret) {
 985                 printf("** Error ext4fs_write() **\n");
 986                 goto fail;
 987         }
 988
 989         *actwrite = len;
 990
 991         return 0;
 992
 993 fail:
 994         *actwrite = 0;
 995
 996         return -1;
 997 }