namei_1.c

阿基米德操作系统的源代码

/////////////////////////////////////////////////////////////////////
#include "general.h"
#include "s_isdirreg.h"

#include "hd_info_struct.h"
#include "dir_entry.h"
#include "msdos_dir_entry.h"
#include "d_inode.h"
#include "m_inode.h"
#include "buffer_head.h"
#include "fat_cache.h"
#include "file.h"
#include "hd_request_struct.h"
#include "super_block.h"

#include "common_head.h"
/////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////
int sys_delete(const char * name)
{
	struct m_inode     * dir, * inode;
	struct buffer_head * bh;
	struct dir_entry   * de;
	const char         * basename;
	int                  namelen;


	if (!(dir = dir_namei(name,&namelen,&basename)))
		return -1;
	if (!namelen) {
		iput(dir);
		return -1;
	}
	bh = find_entry(dir,basename,namelen,&de);
	if (!bh) {
		iput(dir);
		return -1;
	}
	inode = iget(dir->i_dev, de->inode);
	if (!inode) {
		brelse(bh);
		iput(dir);
		return -1;
	}
	if (!S_ISREG(inode->i_mode)) {
		iput(inode);
		brelse(bh);
		iput(dir);
		return -1;
	}

	inode->i_nlinks--;
	inode->i_mtime	= file_datetime;
	inode->i_dirt	= 1;
	iput(inode);

	de->inode		= 0;
	bh->b_dirt		= 1;
	brelse(bh);

	dir->i_mtime	= file_datetime;
	dir->i_dirt		= 1;
	iput(dir);

	return 0;
}