errcode_t ext2fs_mmp_init(ext2_filsys fs)
{
struct ext2_super_block *sb = fs->super;
blk64_t mmp_block;
errcode_t retval;
if (sb->s_mmp_update_interval == 0)
sb->s_mmp_update_interval = EXT4_MMP_UPDATE_INTERVAL;
/* This is probably excessively large, but who knows? */
else if (sb->s_mmp_update_interval > EXT4_MMP_MAX_UPDATE_INTERVAL)
return EXT2_ET_INVALID_ARGUMENT;
if (fs->mmp_buf == NULL) {
retval = ext2fs_get_mem(fs->blocksize, &fs->mmp_buf);
if (retval)
goto out;
}
retval = ext2fs_alloc_block2(fs, 0, fs->mmp_buf, &mmp_block);
if (retval)
goto out;
sb->s_mmp_block = mmp_block;
retval = ext2fs_mmp_reset(fs);
if (retval)
goto out;
out:
return retval;
}
errcode_t ext2fs_alloc_block(ext2_filsys fs, blk_t goal,
char *block_buf, blk_t *ret)
{
errcode_t retval;
blk64_t val;
retval = ext2fs_alloc_block2(fs, goal, block_buf, &val);
if (!retval)
*ret = (blk_t) val;
return retval;
}
