lwext4/ext4_journal.c

   1 /**
   2  * @file  ext4_journal.c
   3  * @brief Journalling
   4  */
   5
   6 #include "ext4_config.h"
   7 #include "ext4_types.h"
   8 #include "ext4_fs.h"
   9 #include "ext4_errno.h"
  10 #include "ext4_blockdev.h"
  11 #include "ext4_crc32c.h"
  12 #include "ext4_debug.h"
  13
  14 #include <string.h>
  15
  16 int jbd_get_fs(struct ext4_fs *fs,
  17                struct jbd_fs *jbd_fs)
  18 {
  19         int rc;
  20         uint32_t journal_ino;
  21
  22         memset(jbd_fs, 0, sizeof(struct jbd_fs));
  23         journal_ino = ext4_get32(&fs->sb, journal_inode_number);
  24
  25         rc = ext4_fs_get_inode_ref(fs,
  26                                    journal_ino,
  27                                    &jbd_fs->inode_ref);
  28         return rc;
  29 }
  30
  31 int jbd_put_fs(struct jbd_fs *jbd_fs)
  32 {
  33         int rc;
  34         rc = ext4_fs_put_inode_ref(&jbd_fs->inode_ref);
  35         return rc;
  36 }
  37
  38 int jbd_inode_bmap(struct jbd_fs *jbd_fs,
  39                    ext4_lblk_t iblock,
  40                    ext4_fsblk_t *fblock)
  41 {
  42         int rc = ext4_fs_get_inode_data_block_index(
  43                         &jbd_fs->inode_ref,
  44                         iblock,
  45                         fblock,
  46                         false);
  47         return rc;
  48 }
  49
  50 int jbd_block_get(struct jbd_fs *jbd_fs,
  51                   struct ext4_block *block,
  52                   ext4_fsblk_t fblock)
  53 {
  54         /* TODO: journal device. */
  55         int rc;
  56         ext4_lblk_t iblock = (ext4_lblk_t)fblock;
  57         rc = jbd_inode_bmap(jbd_fs, iblock,
  58                             &fblock);
  59         if (rc != EOK)
  60                 return rc;
  61
  62         struct ext4_blockdev *bdev = jbd_fs->inode_ref.fs->bdev;
  63         rc = ext4_block_get(bdev, block, fblock);
  64         return rc;
  65 }
  66
  67 int jbd_block_get_noread(struct jbd_fs *jbd_fs,
  68                          struct ext4_block *block,
  69                          ext4_fsblk_t fblock)
  70 {
  71         /* TODO: journal device. */
  72         int rc;
  73         ext4_lblk_t iblock = (ext4_lblk_t)fblock;
  74         rc = jbd_inode_bmap(jbd_fs, iblock,
  75                             &fblock);
  76         if (rc != EOK)
  77                 return rc;
  78
  79         struct ext4_blockdev *bdev = jbd_fs->inode_ref.fs->bdev;
  80         rc = ext4_block_get_noread(bdev, block, fblock);
  81         return rc;
  82 }
  83
  84 int jbd_block_set(struct jbd_fs *jbd_fs,
  85                   struct ext4_block *block)
  86 {
  87         return ext4_block_set(jbd_fs->inode_ref.fs->bdev,
  88                               block);
  89 }