mirror of
https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-10 12:16:48 +00:00
63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
#include "mount.h"
|
||
#include "VFS.h"
|
||
#include <common/glib.h>
|
||
#include <common/string.h>
|
||
|
||
static struct List mnt_list_head; // 挂载点链表头
|
||
|
||
/**
|
||
* @brief 初始化mount机制
|
||
*
|
||
* @return int 错误码
|
||
*/
|
||
int mount_init()
|
||
{
|
||
list_init(&mnt_list_head);
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
* @brief 将new_dentry挂载
|
||
*
|
||
* @param old_dentry 挂载点的dentry
|
||
* @param new_dentry 待挂载的新的dentry(需使用vfs_alloc_dentry来分配)
|
||
* @return int 错误码
|
||
*/
|
||
int do_mount(struct vfs_dir_entry_t *old_dentry, struct vfs_dir_entry_t *new_dentry)
|
||
{
|
||
struct mountpoint *mp = (struct mountpoint *)kzalloc(sizeof(struct mountpoint), 0);
|
||
list_init(&mp->mnt_list);
|
||
mp->dentry = old_dentry;
|
||
mp->parent_dentry = old_dentry->parent;
|
||
|
||
// kdebug("&new_dentry->name=%#018lx, &old_dentry->name=%#018lx", &new_dentry->name, &old_dentry->name);
|
||
// 拷贝名称
|
||
strncpy(new_dentry->name, old_dentry->name, old_dentry->name_length);
|
||
|
||
new_dentry->d_flags |= VFS_DF_MOUNTED; // 标记新的dentry是一个挂载点
|
||
|
||
list_init(&new_dentry->child_node_list);
|
||
list_init(&new_dentry->subdirs_list);
|
||
new_dentry->parent = old_dentry->parent;
|
||
|
||
// 将新的dentry的list结点替换掉父dentry的列表中的old_dentry的list结点
|
||
list_replace(&old_dentry->child_node_list, &new_dentry->child_node_list);
|
||
|
||
// 后挂载的dentry在链表的末尾（umount恢复的时候需要依赖这个性质）
|
||
list_append(&mnt_list_head, &mp->mnt_list);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
* @brief 取消某个文件系统的挂载
|
||
*
|
||
* @param dentry 对应文件系统的根dentry
|
||
* @return int 错误码
|
||
*/
|
||
int do_umount(struct vfs_dir_entry_t *dentry)
|
||
{
|
||
// todo: 实现umount（主要是结点的恢复问题）
|
||
|
||
return 0;
|
||
} |