fs/ext4/ext4_journal.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  * Journal data structures and headers for Journaling feature of ext4
   8  * have been referred from JBD2 (Journaling Block device 2)
   9  * implementation in Linux Kernel.
  10  * Written by Stephen C. Tweedie <sct@redhat.com>
  11  *
  12  * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved
  13  * This file is part of the Linux kernel and is made available under
  14  * the terms of the GNU General Public License, version 2, or at your
  15  * option, any later version, incorporated herein by reference.
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2 of the License, or
  20  * (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  30  */
  31
  32 #include <common.h>
  33 #include <ext4fs.h>
  34 #include <malloc.h>
  35 #include <ext_common.h>
  36 #include "ext4_common.h"
  37
  38 static struct revoke_blk_list *revk_blk_list;
  39 static struct revoke_blk_list *prev_node;
  40 static int first_node = true;
  41
  42 int gindex;
  43 int gd_index;
  44 int jrnl_blk_idx;
  45 struct journal_log *journal_ptr[MAX_JOURNAL_ENTRIES];
  46 struct dirty_blocks *dirty_block_ptr[MAX_JOURNAL_ENTRIES];
  47
  48 int ext4fs_init_journal(void)
  49 {
  50         int i;
  51         char *temp = NULL;
  52         struct ext_filesystem *fs = get_fs();
  53
  54         /* init globals */
  55         revk_blk_list = NULL;
  56         prev_node = NULL;
  57         gindex = 0;
  58         gd_index = 0;
  59         jrnl_blk_idx = 1;
  60
  61         for (i = 0; i < MAX_JOURNAL_ENTRIES; i++) {
  62                 journal_ptr[i] = zalloc(sizeof(struct journal_log));
  63                 if (!journal_ptr[i])
  64                         goto fail;
  65                 dirty_block_ptr[i] = zalloc(sizeof(struct dirty_blocks));
  66                 if (!dirty_block_ptr[i])
  67                         goto fail;
  68                 journal_ptr[i]->buf = NULL;
  69                 journal_ptr[i]->blknr = -1;
  70
  71                 dirty_block_ptr[i]->buf = NULL;
  72                 dirty_block_ptr[i]->blknr = -1;
  73         }
  74
  75         if (fs->blksz == 4096) {
  76                 temp = zalloc(fs->blksz);
  77                 if (!temp)
  78                         goto fail;
  79                 journal_ptr[gindex]->buf = zalloc(fs->blksz);
  80                 if (!journal_ptr[gindex]->buf)
  81                         goto fail;
  82                 ext4fs_devread(0, 0, fs->blksz, temp);
  83                 memcpy(temp + SUPERBLOCK_SIZE, fs->sb, SUPERBLOCK_SIZE);
  84                 memcpy(journal_ptr[gindex]->buf, temp, fs->blksz);
  85                 journal_ptr[gindex++]->blknr = 0;
  86                 free(temp);
  87         } else {
  88                 journal_ptr[gindex]->buf = zalloc(fs->blksz);
  89                 if (!journal_ptr[gindex]->buf)
  90                         goto fail;
  91                 memcpy(journal_ptr[gindex]->buf, fs->sb, SUPERBLOCK_SIZE);
  92                 journal_ptr[gindex++]->blknr = 1;
  93         }
  94
  95         /* Check the file system state using journal super block */
  96         if (ext4fs_check_journal_state(SCAN))
  97                 goto fail;
  98         /* Check the file system state using journal super block */
  99         if (ext4fs_check_journal_state(RECOVER))
 100                 goto fail;
 101
 102         return 0;
 103 fail:
 104         return -1;
 105 }
 106
 107 void ext4fs_dump_metadata(void)
 108 {
 109         struct ext_filesystem *fs = get_fs();
 110         int i;
 111         for (i = 0; i < MAX_JOURNAL_ENTRIES; i++) {
 112                 if (dirty_block_ptr[i]->blknr == -1)
 113                         break;
 114                 put_ext4((uint64_t) ((uint64_t)dirty_block_ptr[i]->blknr *
 115                                 (uint64_t)fs->blksz), dirty_block_ptr[i]->buf,
 116                                                                 fs->blksz);
 117         }
 118 }
 119
 120 void ext4fs_free_journal(void)
 121 {
 122         int i;
 123         for (i = 0; i < MAX_JOURNAL_ENTRIES; i++) {
 124                 if (dirty_block_ptr[i]->blknr == -1)
 125                         break;
 126                 if (dirty_block_ptr[i]->buf)
 127                         free(dirty_block_ptr[i]->buf);
 128         }
 129
 130         for (i = 0; i < MAX_JOURNAL_ENTRIES; i++) {
 131                 if (journal_ptr[i]->blknr == -1)
 132                         break;
 133                 if (journal_ptr[i]->buf)
 134                         free(journal_ptr[i]->buf);
 135         }
 136
 137         for (i = 0; i < MAX_JOURNAL_ENTRIES; i++) {
 138                 if (journal_ptr[i])
 139                         free(journal_ptr[i]);
 140                 if (dirty_block_ptr[i])
 141                         free(dirty_block_ptr[i]);
 142         }
 143         gindex = 0;
 144         gd_index = 0;
 145         jrnl_blk_idx = 1;
 146 }
 147
 148 int ext4fs_log_gdt(char *gd_table)
 149 {
 150         struct ext_filesystem *fs = get_fs();
 151         short i;
 152         long int var = fs->gdtable_blkno;
 153         for (i = 0; i < fs->no_blk_pergdt; i++) {
 154                 journal_ptr[gindex]->buf = zalloc(fs->blksz);
 155                 if (!journal_ptr[gindex]->buf)
 156                         return -ENOMEM;
 157                 memcpy(journal_ptr[gindex]->buf, gd_table, fs->blksz);
 158                 gd_table += fs->blksz;
 159                 journal_ptr[gindex++]->blknr = var++;
 160         }
 161
 162         return 0;
 163 }
 164
 165 /*
 166  * This function stores the backup copy of meta data in RAM
 167  * journal_buffer -- Buffer containing meta data
 168  * blknr -- Block number on disk of the meta data buffer
 169  */
 170 int ext4fs_log_journal(char *journal_buffer, long int blknr)
 171 {
 172         struct ext_filesystem *fs = get_fs();
 173         short i;
 174
 175         if (!journal_buffer) {
 176                 printf("Invalid input arguments %s\n", __func__);
 177                 return -EINVAL;
 178         }
 179
 180         for (i = 0; i < MAX_JOURNAL_ENTRIES; i++) {
 181                 if (journal_ptr[i]->blknr == -1)
 182                         break;
 183                 if (journal_ptr[i]->blknr == blknr)
 184                         return 0;
 185         }
 186
 187         journal_ptr[gindex]->buf = zalloc(fs->blksz);
 188         if (!journal_ptr[gindex]->buf)
 189                 return -ENOMEM;
 190
 191         memcpy(journal_ptr[gindex]->buf, journal_buffer, fs->blksz);
 192         journal_ptr[gindex++]->blknr = blknr;
 193
 194         return 0;
 195 }
 196
 197 /*
 198  * This function stores the modified meta data in RAM
 199  * metadata_buffer -- Buffer containing meta data
 200  * blknr -- Block number on disk of the meta data buffer
 201  */
 202 int ext4fs_put_metadata(char *metadata_buffer, long int blknr)
 203 {
 204         struct ext_filesystem *fs = get_fs();
 205         if (!metadata_buffer) {
 206                 printf("Invalid input arguments %s\n", __func__);
 207                 return -EINVAL;
 208         }
 209         dirty_block_ptr[gd_index]->buf = zalloc(fs->blksz);
 210         if (!dirty_block_ptr[gd_index]->buf)
 211                 return -ENOMEM;
 212         memcpy(dirty_block_ptr[gd_index]->buf, metadata_buffer, fs->blksz);
 213         dirty_block_ptr[gd_index++]->blknr = blknr;
 214
 215         return 0;
 216 }
 217
 218 void print_revoke_blks(char *revk_blk)
 219 {
 220         int offset;
 221         int max;
 222         long int blocknr;
 223         struct journal_revoke_header_t *header;
 224
 225         if (revk_blk == NULL)
 226                 return;
 227
 228         header = (struct journal_revoke_header_t *) revk_blk;
 229         offset = sizeof(struct journal_revoke_header_t);
 230         max = be32_to_cpu(header->r_count);
 231         printf("total bytes %d\n", max);
 232
 233         while (offset < max) {
 234                 blocknr = be32_to_cpu(*((long int *)(revk_blk + offset)));
 235                 printf("revoke blknr is %ld\n", blocknr);
 236                 offset += 4;
 237         }
 238 }
 239
 240 static struct revoke_blk_list *_get_node(void)
 241 {
 242         struct revoke_blk_list *tmp_node;
 243         tmp_node = zalloc(sizeof(struct revoke_blk_list));
 244         if (tmp_node == NULL)
 245                 return NULL;
 246         tmp_node->content = NULL;
 247         tmp_node->next = NULL;
 248
 249         return tmp_node;
 250 }
 251
 252 void ext4fs_push_revoke_blk(char *buffer)
 253 {
 254         struct revoke_blk_list *node = NULL;
 255         struct ext_filesystem *fs = get_fs();
 256         if (buffer == NULL) {
 257                 printf("buffer ptr is NULL\n");
 258                 return;
 259         }
 260         node = _get_node();
 261         if (!node) {
 262                 printf("_get_node: malloc failed\n");
 263                 return;
 264         }
 265
 266         node->content = zalloc(fs->blksz);
 267         if (node->content == NULL)
 268                 return;
 269         memcpy(node->content, buffer, fs->blksz);
 270
 271         if (first_node == true) {
 272                 revk_blk_list = node;
 273                 prev_node = node;
 274                  first_node = false;
 275         } else {
 276                 prev_node->next = node;
 277                 prev_node = node;
 278         }
 279 }
 280
 281 void ext4fs_free_revoke_blks(void)
 282 {
 283         struct revoke_blk_list *tmp_node = revk_blk_list;
 284         struct revoke_blk_list *next_node = NULL;
 285
 286         while (tmp_node != NULL) {
 287                 if (tmp_node->content)
 288                         free(tmp_node->content);
 289                 tmp_node = tmp_node->next;
 290         }
 291
 292         tmp_node = revk_blk_list;
 293         while (tmp_node != NULL) {
 294                 next_node = tmp_node->next;
 295                 free(tmp_node);
 296                 tmp_node = next_node;
 297         }
 298
 299         revk_blk_list = NULL;
 300         prev_node = NULL;
 301         first_node = true;
 302 }
 303
 304 int check_blknr_for_revoke(long int blknr, int sequence_no)
 305 {
 306         struct journal_revoke_header_t *header;
 307         int offset;
 308         int max;
 309         long int blocknr;
 310         char *revk_blk;
 311         struct revoke_blk_list *tmp_revk_node = revk_blk_list;
 312         while (tmp_revk_node != NULL) {
 313                 revk_blk = tmp_revk_node->content;
 314
 315                 header = (struct journal_revoke_header_t *) revk_blk;
 316                 if (sequence_no < be32_to_cpu(header->r_header.h_sequence)) {
 317                         offset = sizeof(struct journal_revoke_header_t);
 318                         max = be32_to_cpu(header->r_count);
 319
 320                         while (offset < max) {
 321                                 blocknr = be32_to_cpu(*((long int *)
 322                                                   (revk_blk + offset)));
 323                                 if (blocknr == blknr)
 324                                         goto found;
 325                                 offset += 4;
 326                         }
 327                 }
 328                 tmp_revk_node = tmp_revk_node->next;
 329         }
 330
 331         return -1;
 332
 333 found:
 334         return 0;
 335 }
 336
 337 /*
 338  * This function parses the journal blocks and replays the
 339  * suceessful transactions. A transaction is successfull
 340  * if commit block is found for a descriptor block
 341  * The tags in descriptor block contain the disk block
 342  * numbers of the metadata  to be replayed
 343  */
 344 void recover_transaction(int prev_desc_logical_no)
 345 {
 346         struct ext2_inode inode_journal;
 347         struct ext_filesystem *fs = get_fs();
 348         struct journal_header_t *jdb;
 349         long int blknr;
 350         char *p_jdb;
 351         int ofs, flags;
 352         int i;
 353         struct ext3_journal_block_tag *tag;
 354         char *temp_buff = zalloc(fs->blksz);
 355         char *metadata_buff = zalloc(fs->blksz);
 356         if (!temp_buff || !metadata_buff)
 357                 goto fail;
 358         i = prev_desc_logical_no;
 359         ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO,
 360                           (struct ext2_inode *)&inode_journal);
 361         blknr = read_allocated_block((struct ext2_inode *)
 362                                      &inode_journal, i);
 363         ext4fs_devread(blknr * fs->sect_perblk, 0, fs->blksz, temp_buff);
 364         p_jdb = (char *)temp_buff;
 365         jdb = (struct journal_header_t *) temp_buff;
 366         ofs = sizeof(struct journal_header_t);
 367
 368         do {
 369                 tag = (struct ext3_journal_block_tag *)&p_jdb[ofs];
 370                 ofs += sizeof(struct ext3_journal_block_tag);
 371
 372                 if (ofs > fs->blksz)
 373                         break;
 374
 375                 flags = be32_to_cpu(tag->flags);
 376                 if (!(flags & EXT3_JOURNAL_FLAG_SAME_UUID))
 377                         ofs += 16;
 378
 379                 i++;
 380                 debug("\t\ttag %u\n", be32_to_cpu(tag->block));
 381                 if (revk_blk_list != NULL) {
 382                         if (check_blknr_for_revoke(be32_to_cpu(tag->block),
 383                                 be32_to_cpu(jdb->h_sequence)) == 0)
 384                                 continue;
 385                 }
 386                 blknr = read_allocated_block(&inode_journal, i);
 387                 ext4fs_devread(blknr * fs->sect_perblk, 0,
 388                                fs->blksz, metadata_buff);
 389                 put_ext4((uint64_t)(be32_to_cpu(tag->block) * fs->blksz),
 390                          metadata_buff, (uint32_t) fs->blksz);
 391         } while (!(flags & EXT3_JOURNAL_FLAG_LAST_TAG));
 392 fail:
 393         free(temp_buff);
 394         free(metadata_buff);
 395 }
 396
 397 void print_jrnl_status(int recovery_flag)
 398 {
 399         if (recovery_flag == RECOVER)
 400                 printf("Journal Recovery Completed\n");
 401         else
 402                 printf("Journal Scan Completed\n");
 403 }
 404
 405 int ext4fs_check_journal_state(int recovery_flag)
 406 {
 407         int i;
 408         int DB_FOUND = NO;
 409         long int blknr;
 410         int transaction_state = TRANSACTION_COMPLETE;
 411         int prev_desc_logical_no = 0;
 412         int curr_desc_logical_no = 0;
 413         int ofs, flags;
 414         struct ext2_inode inode_journal;
 415         struct journal_superblock_t *jsb = NULL;
 416         struct journal_header_t *jdb = NULL;
 417         char *p_jdb = NULL;
 418         struct ext3_journal_block_tag *tag = NULL;
 419         char *temp_buff = NULL;
 420         char *temp_buff1 = NULL;
 421         struct ext_filesystem *fs = get_fs();
 422
 423         temp_buff = zalloc(fs->blksz);
 424         if (!temp_buff)
 425                 return -ENOMEM;
 426         temp_buff1 = zalloc(fs->blksz);
 427         if (!temp_buff1) {
 428                 free(temp_buff);
 429                 return -ENOMEM;
 430         }
 431
 432         ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO, &inode_journal);
 433         blknr = read_allocated_block(&inode_journal, EXT2_JOURNAL_SUPERBLOCK);
 434         ext4fs_devread(blknr * fs->sect_perblk, 0, fs->blksz, temp_buff);
 435         jsb = (struct journal_superblock_t *) temp_buff;
 436
 437         if (fs->sb->feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) {
 438                 if (recovery_flag == RECOVER)
 439                         printf("Recovery required\n");
 440         } else {
 441                 if (recovery_flag == RECOVER)
 442                         printf("File System is consistent\n");
 443                 goto end;
 444         }
 445
 446         if (be32_to_cpu(jsb->s_start) == 0)
 447                 goto end;
 448
 449         if (!(jsb->s_feature_compat &
 450                                 cpu_to_be32(JBD2_FEATURE_COMPAT_CHECKSUM)))
 451                 jsb->s_feature_compat |=
 452                                 cpu_to_be32(JBD2_FEATURE_COMPAT_CHECKSUM);
 453
 454         i = be32_to_cpu(jsb->s_first);
 455         while (1) {
 456                 blknr = read_allocated_block(&inode_journal, i);
 457                 memset(temp_buff1, '\0', fs->blksz);
 458                 ext4fs_devread(blknr * fs->sect_perblk,
 459                                0, fs->blksz, temp_buff1);
 460                 jdb = (struct journal_header_t *) temp_buff1;
 461
 462                 if (be32_to_cpu(jdb->h_blocktype) ==
 463                     EXT3_JOURNAL_DESCRIPTOR_BLOCK) {
 464                         if (be32_to_cpu(jdb->h_sequence) !=
 465                             be32_to_cpu(jsb->s_sequence)) {
 466                                 print_jrnl_status(recovery_flag);
 467                                 break;
 468                         }
 469
 470                         curr_desc_logical_no = i;
 471                         if (transaction_state == TRANSACTION_COMPLETE)
 472                                 transaction_state = TRANSACTION_RUNNING;
 473                         else
 474                                 return -1;
 475                         p_jdb = (char *)temp_buff1;
 476                         ofs = sizeof(struct journal_header_t);
 477                         do {
 478                                 tag = (struct ext3_journal_block_tag *)
 479                                     &p_jdb[ofs];
 480                                 ofs += sizeof(struct ext3_journal_block_tag);
 481                                 if (ofs > fs->blksz)
 482                                         break;
 483                                 flags = be32_to_cpu(tag->flags);
 484                                 if (!(flags & EXT3_JOURNAL_FLAG_SAME_UUID))
 485                                         ofs += 16;
 486                                 i++;
 487                                 debug("\t\ttag %u\n", be32_to_cpu(tag->block));
 488                         } while (!(flags & EXT3_JOURNAL_FLAG_LAST_TAG));
 489                         i++;
 490                         DB_FOUND = YES;
 491                 } else if (be32_to_cpu(jdb->h_blocktype) ==
 492                                 EXT3_JOURNAL_COMMIT_BLOCK) {
 493                         if (be32_to_cpu(jdb->h_sequence) !=
 494                              be32_to_cpu(jsb->s_sequence)) {
 495                                 print_jrnl_status(recovery_flag);
 496                                 break;
 497                         }
 498
 499                         if (transaction_state == TRANSACTION_RUNNING ||
 500                                         (DB_FOUND == NO)) {
 501                                 transaction_state = TRANSACTION_COMPLETE;
 502                                 i++;
 503                                 jsb->s_sequence =
 504                                         cpu_to_be32(be32_to_cpu(
 505                                                 jsb->s_sequence) + 1);
 506                         }
 507                         prev_desc_logical_no = curr_desc_logical_no;
 508                         if ((recovery_flag == RECOVER) && (DB_FOUND == YES))
 509                                 recover_transaction(prev_desc_logical_no);
 510
 511                         DB_FOUND = NO;
 512                 } else if (be32_to_cpu(jdb->h_blocktype) ==
 513                                 EXT3_JOURNAL_REVOKE_BLOCK) {
 514                         if (be32_to_cpu(jdb->h_sequence) !=
 515                             be32_to_cpu(jsb->s_sequence)) {
 516                                 print_jrnl_status(recovery_flag);
 517                                 break;
 518                         }
 519                         if (recovery_flag == SCAN)
 520                                 ext4fs_push_revoke_blk((char *)jdb);
 521                         i++;
 522                 } else {
 523                         debug("Else Case\n");
 524                         if (be32_to_cpu(jdb->h_sequence) !=
 525                             be32_to_cpu(jsb->s_sequence)) {
 526                                 print_jrnl_status(recovery_flag);
 527                                 break;
 528                         }
 529                 }
 530         }
 531
 532 end:
 533         if (recovery_flag == RECOVER) {
 534                 jsb->s_start = cpu_to_be32(1);
 535                 jsb->s_sequence = cpu_to_be32(be32_to_cpu(jsb->s_sequence) + 1);
 536                 /* get the superblock */
 537                 ext4fs_devread(SUPERBLOCK_SECTOR, 0, SUPERBLOCK_SIZE,
 538                                (char *)fs->sb);
 539                 fs->sb->feature_incompat |= EXT3_FEATURE_INCOMPAT_RECOVER;
 540
 541                 /* Update the super block */
 542                 put_ext4((uint64_t) (SUPERBLOCK_SIZE),
 543                          (struct ext2_sblock *)fs->sb,
 544                          (uint32_t) SUPERBLOCK_SIZE);
 545                 ext4fs_devread(SUPERBLOCK_SECTOR, 0, SUPERBLOCK_SIZE,
 546                                (char *)fs->sb);
 547
 548                 blknr = read_allocated_block(&inode_journal,
 549                                          EXT2_JOURNAL_SUPERBLOCK);
 550                 put_ext4((uint64_t) (blknr * fs->blksz),
 551                          (struct journal_superblock_t *)temp_buff,
 552                          (uint32_t) fs->blksz);
 553                 ext4fs_free_revoke_blks();
 554         }
 555         free(temp_buff);
 556         free(temp_buff1);
 557
 558         return 0;
 559 }
 560
 561 static void update_descriptor_block(long int blknr)
 562 {
 563         int i;
 564         long int jsb_blknr;
 565         struct journal_header_t jdb;
 566         struct ext3_journal_block_tag tag;
 567         struct ext2_inode inode_journal;
 568         struct journal_superblock_t *jsb = NULL;
 569         char *buf = NULL;
 570         char *temp = NULL;
 571         struct ext_filesystem *fs = get_fs();
 572         char *temp_buff = zalloc(fs->blksz);
 573         if (!temp_buff)
 574                 return;
 575
 576         ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO, &inode_journal);
 577         jsb_blknr = read_allocated_block(&inode_journal,
 578                                          EXT2_JOURNAL_SUPERBLOCK);
 579         ext4fs_devread(jsb_blknr * fs->sect_perblk, 0, fs->blksz, temp_buff);
 580         jsb = (struct journal_superblock_t *) temp_buff;
 581
 582         jdb.h_blocktype = cpu_to_be32(EXT3_JOURNAL_DESCRIPTOR_BLOCK);
 583         jdb.h_magic = cpu_to_be32(EXT3_JOURNAL_MAGIC_NUMBER);
 584         jdb.h_sequence = jsb->s_sequence;
 585         buf = zalloc(fs->blksz);
 586         if (!buf) {
 587                 free(temp_buff);
 588                 return;
 589         }
 590         temp = buf;
 591         memcpy(buf, &jdb, sizeof(struct journal_header_t));
 592         temp += sizeof(struct journal_header_t);
 593
 594         for (i = 0; i < MAX_JOURNAL_ENTRIES; i++) {
 595                 if (journal_ptr[i]->blknr == -1)
 596                         break;
 597
 598                 tag.block = cpu_to_be32(journal_ptr[i]->blknr);
 599                 tag.flags = cpu_to_be32(EXT3_JOURNAL_FLAG_SAME_UUID);
 600                 memcpy(temp, &tag, sizeof(struct ext3_journal_block_tag));
 601                 temp = temp + sizeof(struct ext3_journal_block_tag);
 602         }
 603
 604         tag.block = cpu_to_be32(journal_ptr[--i]->blknr);
 605         tag.flags = cpu_to_be32(EXT3_JOURNAL_FLAG_LAST_TAG);
 606         memcpy(temp - sizeof(struct ext3_journal_block_tag), &tag,
 607                sizeof(struct ext3_journal_block_tag));
 608         put_ext4((uint64_t) (blknr * fs->blksz), buf, (uint32_t) fs->blksz);
 609
 610         free(temp_buff);
 611         free(buf);
 612 }
 613
 614 static void update_commit_block(long int blknr)
 615 {
 616         struct journal_header_t jdb;
 617         struct ext_filesystem *fs = get_fs();
 618         char *buf = NULL;
 619         struct ext2_inode inode_journal;
 620         struct journal_superblock_t *jsb;
 621         long int jsb_blknr;
 622         char *temp_buff = zalloc(fs->blksz);
 623         if (!temp_buff)
 624                 return;
 625
 626         ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO, &inode_journal);
 627         jsb_blknr = read_allocated_block(&inode_journal,
 628                                          EXT2_JOURNAL_SUPERBLOCK);
 629         ext4fs_devread(jsb_blknr * fs->sect_perblk, 0, fs->blksz, temp_buff);
 630         jsb = (struct journal_superblock_t *) temp_buff;
 631
 632         jdb.h_blocktype = cpu_to_be32(EXT3_JOURNAL_COMMIT_BLOCK);
 633         jdb.h_magic = cpu_to_be32(EXT3_JOURNAL_MAGIC_NUMBER);
 634         jdb.h_sequence = jsb->s_sequence;
 635         buf = zalloc(fs->blksz);
 636         if (!buf) {
 637                 free(temp_buff);
 638                 return;
 639         }
 640         memcpy(buf, &jdb, sizeof(struct journal_header_t));
 641         put_ext4((uint64_t) (blknr * fs->blksz), buf, (uint32_t) fs->blksz);
 642
 643         free(temp_buff);
 644         free(buf);
 645 }
 646
 647 void ext4fs_update_journal(void)
 648 {
 649         struct ext2_inode inode_journal;
 650         struct ext_filesystem *fs = get_fs();
 651         long int blknr;
 652         int i;
 653         ext4fs_read_inode(ext4fs_root, EXT2_JOURNAL_INO, &inode_journal);
 654         blknr = read_allocated_block(&inode_journal, jrnl_blk_idx++);
 655         update_descriptor_block(blknr);
 656         for (i = 0; i < MAX_JOURNAL_ENTRIES; i++) {
 657                 if (journal_ptr[i]->blknr == -1)
 658                         break;
 659                 blknr = read_allocated_block(&inode_journal, jrnl_blk_idx++);
 660                 put_ext4((uint64_t) ((uint64_t)blknr * (uint64_t)fs->blksz),
 661                          journal_ptr[i]->buf, fs->blksz);
 662         }
 663         blknr = read_allocated_block(&inode_journal, jrnl_blk_idx++);
 664         update_commit_block(blknr);
 665         printf("update journal finished\n");
 666 }