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https://github.com/DragonOS-Community/DragonOS.git
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99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
#include "mount.h"
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#include "VFS.h"
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#include <common/glib.h>
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#include <common/string.h>
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static struct List mnt_list_head; // 挂载点链表头
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/**
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* @brief 初始化mount机制
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*
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* @return int 错误码
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*/
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int mount_init()
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{
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list_init(&mnt_list_head);
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return 0;
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}
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/**
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* @brief 将new_dentry挂载
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*
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* @param old_dentry 挂载点的dentry
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* @param new_dentry 待挂载的新的dentry(需使用vfs_alloc_dentry来分配)
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* @return int 错误码
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*/
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int do_mount(struct vfs_dir_entry_t *old_dentry, struct vfs_dir_entry_t *new_dentry)
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{
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struct mountpoint *mp = (struct mountpoint *)kzalloc(sizeof(struct mountpoint), 0);
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list_init(&mp->mnt_list);
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mp->dentry = old_dentry;
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mp->parent_dentry = old_dentry->parent;
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// 拷贝名称
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strncpy(new_dentry->name, old_dentry->name, old_dentry->name_length);
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kdebug("new_dentry->name=%s, old_dentry->name=%s, old_dentry->name_length=%d", new_dentry->name, old_dentry->name, old_dentry->name_length);
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new_dentry->d_flags |= VFS_DF_MOUNTED; // 标记新的dentry是一个挂载点
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list_init(&new_dentry->child_node_list);
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list_init(&new_dentry->subdirs_list);
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new_dentry->parent = old_dentry->parent;
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// 将新的dentry的list结点替换掉父dentry的列表中的old_dentry的list结点
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list_replace(&old_dentry->child_node_list, &new_dentry->child_node_list);
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// 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）
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list_append(&mnt_list_head, &mp->mnt_list);
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return 0;
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}
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/**
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* @brief 取消某个文件系统的挂载
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*
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* @param dentry 对应文件系统的根dentry
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* @return int 错误码
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*/
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int do_umount(struct vfs_dir_entry_t *dentry)
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{
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// todo: 实现umount（主要是结点的恢复问题）
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return 0;
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}
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/**
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* @brief 根据mountpoint的父目录dentry查找第一个符合条件的mountpoint结构体
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*
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* @param dentry 父dentry
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* @return struct mountpoint* 第一个符合条件的mountpoint结构体的指针
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*/
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struct mountpoint *mount_find_mnt_list_by_parent(struct vfs_dir_entry_t *dentry)
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{
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struct List *list = &mnt_list_head;
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struct mountpoint *ret = NULL;
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if (list_empty(list))
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return NULL;
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while (list_next(list) != &mnt_list_head)
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{
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list = list_next(list);
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struct mountpoint *tmp = container_of(list, struct mountpoint, mnt_list);
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if (dentry == tmp->parent_dentry)
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return tmp;
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}
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return NULL;
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}
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/**
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* @brief 将挂载点结构体从链表中删除并释放
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*
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* @param mp mountpoint结构体
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* @return int 错误码
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*/
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int mount_release_mountpoint(struct mountpoint *mp)
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{
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list_del(&mp->mnt_list);
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return kfree(mp);
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} |