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/**
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 * @file
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 *
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 * @date Oct 24, 2013
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 * @author: Anton Bondarev
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 */
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <fs/hlpr_path.h>
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#include <fs/perm.h>
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#include <security/security.h>
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#include <fs/vfs.h>
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#include <fs/inode.h>
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#include <fs/inode_operation.h>
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#include <fs/path.h>
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#include <fs/fs_driver.h>
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#include <fs/file_desc.h>
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#include <sys/time.h>
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#include <utime.h>
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#include <drivers/block_dev.h>
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int ktruncate(struct inode *node, off_t length) {
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	int ret;
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	if (S_ISDIR(node->i_mode)) {
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		SET_ERRNO(EISDIR);
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		return -1;
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	}
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	if (0 > (ret = fs_perm_check(node, S_IWOTH))) {
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		SET_ERRNO(-ret);
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		return -1;
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	}
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	if ((!node->i_sb->sb_iops) || (!node->i_sb->sb_iops->ino_truncate)) {
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		//SET_ERRNO(ENOTSUP);
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		//SET_ERRNO(EPERM); it may mean that file it's not possible to modify
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		return 0;
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	}
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	if (0 > (ret = node->i_sb->sb_iops->ino_truncate(node, length))) {
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		SET_ERRNO(-ret);
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		return -1;
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	}
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	return ret;
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}
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int kfile_fill_stat(struct inode *node, struct stat *stat_buff) {
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	memset(stat_buff, 0 , sizeof(struct stat));
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	stat_buff->st_size = inode_size(node);
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	stat_buff->st_mode = node->i_mode;
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	stat_buff->st_uid = node->i_owner_id;
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	stat_buff->st_gid = node->i_group_id;
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	stat_buff->st_ctime = inode_ctime(node);
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	stat_buff->st_mtime = inode_mtime(node);
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	stat_buff->st_blocks = stat_buff->st_size;
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        if (node->i_sb->bdev) {
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        	stat_buff->st_blocks /= block_dev_block_size(node->i_sb->bdev);
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	       	stat_buff->st_blocks += (stat_buff->st_blocks % block_dev_block_size(node->i_sb->bdev) != 0);	
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        }
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	return 0;
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}
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int kfile_change_stat(struct inode *node, const struct utimbuf *times) {
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	struct timeval now;
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	if (node == NULL) {
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		return -ENOENT;
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	}
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	if (times == NULL) {
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		if (gettimeofday(&now, NULL) == -1) {
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			return -EINVAL;
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		}
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		inode_ctime_set(node, now.tv_sec);
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		return 0;
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	}
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	inode_ctime_set(node, times->actime);
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	inode_mtime_set(node, times->modtime);
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	return 0;
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}
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