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109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
#pragma once
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#include "devfs.h"
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#include <common/string.h>
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extern struct vfs_super_block_operations_t devfs_sb_ops;
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extern struct vfs_dir_entry_operations_t devfs_dentry_ops;
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extern struct vfs_file_operations_t devfs_file_ops;
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extern struct vfs_inode_operations_t devfs_inode_ops;
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extern struct vfs_superblock_t devfs_sb;
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// 分配inode
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#define __devfs_alloc_inode() ((struct vfs_index_node_t *)kzalloc(sizeof(struct vfs_index_node_t), 0))
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/**
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* @brief 在devfs中注册字符设备（该函数只应被devfs调用）
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*
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* @param private_info inode私有信息
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* @param target_dentry 返回的dentry的指针
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* @return int 错误码
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*/
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int __devfs_chardev_register(struct devfs_private_inode_info_t *private_info, struct vfs_dir_entry_t **target_dentry);
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/**
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* @brief 初始化chardev管理机制
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*
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*/
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void __devfs_chardev_init();
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/**
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* @brief 在父dentry中寻找子dentry
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*
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* @param parent_dentry 父dentry结点
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* @param name 子目录项名称
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* @return struct vfs_dir_entry_t*
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*/
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static inline struct vfs_dir_entry_t *__devfs_find_dentry(struct vfs_dir_entry_t *parent_dentry, const char *name)
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{
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struct List *list = &parent_dentry->subdirs_list;
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while (list_next(list) != &parent_dentry->subdirs_list)
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{
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list = list_next(list);
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// 获取目标dentry（由于是子目录项，因此是child_node_list）
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struct vfs_dir_entry_t *target_dent = container_of(list, struct vfs_dir_entry_t, child_node_list);
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if (strcmp(target_dent->name, name) == 0)
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return target_dent;
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}
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return NULL;
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}
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/**
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* @brief 在父目录下查找子目录
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*
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* @param parent_dentry 父目录
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* @param name 子目录名
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* @return struct vfs_dir_entry_t* 子目录的dentry （找不到则返回NULL）
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*/
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static inline struct vfs_dir_entry_t *__devfs_find_dir(struct vfs_dir_entry_t *parent_dentry, const char *name)
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{
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struct vfs_dir_entry_t *target_dent = __devfs_find_dentry(parent_dentry, name);
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if (target_dent->dir_inode->attribute & VFS_IF_DIR) // 名称相符且为目录，则返回dentry
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return target_dent;
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else
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return NULL; // 否则直接返回空
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}
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/**
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* @brief 将dentry和inode进行绑定，并填充inode
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*
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* @param dentry 目标dentry
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* @param inode 目标inode
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* @param inode_attr inode的属性
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* @param private_inode_data inode私有信息
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*/
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static inline void __devfs_fill_inode(struct vfs_dir_entry_t *dentry, struct vfs_index_node_t *inode, uint64_t inode_attr, struct devfs_private_inode_info_t *private_inode_data)
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{
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dentry->dir_inode = inode;
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dentry->dir_inode->file_ops = private_inode_data->f_ops;
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dentry->dir_inode->inode_ops = &devfs_inode_ops;
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dentry->dir_inode->private_inode_info = private_inode_data;
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dentry->dir_inode->sb = &devfs_sb;
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dentry->dir_inode->attribute = inode_attr;
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}
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/**
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* @brief 填充dentry中的内容
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*
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* @param dentry 待填充的dentry
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* @param name dentry名称
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*/
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static inline void __devfs_fill_dentry(struct vfs_dir_entry_t *dentry, const char *name)
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{
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strcpy(dentry->name, name);
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dentry->name_length = strlen(name);
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dentry->dir_ops = &devfs_dentry_ops;
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}
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/**
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* @brief 将dentry与父dentry进行绑定
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* @param parent 父目录项
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* @param dentry 子目录项
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*/
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#define __devfs_dentry_bind_parent(parent_dentry, dentry) \
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do \
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{ \
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(dentry)->parent = (parent_dentry); \
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list_append(&((parent_dentry)->subdirs_list), &((dentry)->child_node_list)); \
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} while (0) |