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https://github.com/DragonOS-Community/DragonOS.git
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83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
#include "internal.h"
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#include <common/kfifo.h>
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#include <debug/bug.h>
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/**
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* @brief 释放dentry
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*
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* @param dentry 目标dentry
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*/
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void vfs_dentry_put(struct vfs_dir_entry_t *dentry)
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{
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int retval = 0;
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uint64_t in_value = 0;
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// todo: 加锁、放锁
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// 创建一个用来存放指向dentry的指针的fifo队列
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struct kfifo_t fifo;
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// 暂时假设队列大小为1024个元素
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// todo: 实现队列的自动扩容功能
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retval = kfifo_alloc(&fifo, 1024 * sizeof(uint64_t), 0);
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if (retval != 0)
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goto failed;
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// 将根dentry加入队列
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in_value = (uint64_t)dentry;
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kfifo_in(&fifo, &in_value, sizeof(uint64_t));
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list_del(&dentry->child_node_list); // 从父dentry中删除
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while (!kfifo_empty(&fifo))
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{
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// 取出队列中的下一个元素
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kfifo_out(&fifo, &dentry, sizeof(uint64_t));
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BUG_ON(dentry == NULL);
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struct List *list = &dentry->subdirs_list;
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if (!list_empty(list))
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{
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// 将当前dentry下的所有dentry加入队列
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do
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{
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list = list_next(list);
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in_value = (uint64_t)container_of(list, struct vfs_dir_entry_t, child_node_list);
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if (in_value != NULL)
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kfifo_in(&fifo, &in_value, sizeof(uint64_t));
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} while (list_next(list) != (&dentry->subdirs_list));
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}
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// 释放inode
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vfs_free_inode(dentry->dir_inode);
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// 若当前dentry是否为挂载点，则umount
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if (is_local_mountpoint(dentry))
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do_umount(dentry);
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dentry->dir_ops->release(dentry);
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kfree(dentry);
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}
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kfifo_free_alloc(&fifo);
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return;
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failed:;
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if (fifo.buffer != NULL)
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kfifo_free_alloc(&fifo);
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kerror("dentry_put failed.");
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}
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/**
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* @brief 释放inode
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*
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* @param inode 待释放的inode
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* @return int 错误码
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*/
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int vfs_free_inode(struct vfs_index_node_t *inode)
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{
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--inode->ref_count;
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BUG_ON(inode->ref_count < 0);
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if (inode->ref_count == 0)
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{
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kfree(inode->private_inode_info);
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kfree(inode);
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}
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return 0;
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} |