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/*
* Copyright (c) 2006-2025 RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-05-05 Bernard Implement vnode in dfs v2.0
*/
#include <dfs_file.h>
#include <dfs_dentry.h>
#include <dfs_mnt.h>
#ifdef RT_USING_PAGECACHE
#include "dfs_pcache.h"
#endif
#define DBG_TAG "DFS.vnode"
#define DBG_LVL DBG_WARNING
#include <rtdbg.h>
/**
* @brief Initialize a virtual node (vnode) structure
*
* @param[in,out] vnode Pointer to the vnode to be initialized
* @param[in] type Type of the vnode
* @param[in] fops Pointer to file operations structure
*
* @return int Always returns 0 indicating success
*/
int dfs_vnode_init(struct dfs_vnode *vnode, int type, const struct dfs_file_ops *fops)
{
if (vnode)
{
rt_memset(vnode, 0, sizeof(struct dfs_vnode));
vnode->type = type;
rt_atomic_store(&(vnode->ref_count), 1);
vnode->mnt = RT_NULL;
vnode->fops = fops;
}
return 0;
}
/**
* @brief Create and initialize a new virtual node (vnode)
*
* @return struct dfs_vnode* Pointer to the newly created vnode, or NULL if creation failed
*/
struct dfs_vnode *dfs_vnode_create(void)
{
struct dfs_vnode *vnode = rt_calloc(1, sizeof(struct dfs_vnode));
if (!vnode)
{
LOG_E("create a vnode failed.");
return RT_NULL;
}
rt_atomic_store(&(vnode->ref_count), 1);
LOG_I("create a vnode: %p", vnode);
return vnode;
}
/**
* @brief Initialize the lock of a virtual node (vnode)
*
* @param[in,out] vnode Pointer to the vnode containing the lock
* @param[in] dentry Pointer to the dentry used to identify the vnode
*
* @return RT_EOK on success, or -RT_EINVAL if a parameter is invalid
*/
rt_err_t dfs_vnode_lock_init(struct dfs_vnode *vnode, struct dfs_dentry *dentry)
{
char lock_name[RT_NAME_MAX];
uint32_t path_hash;
if (vnode == RT_NULL || dentry == RT_NULL)
{
return -RT_EINVAL;
}
path_hash = dfs_dentry_full_path_crc32(dentry);
rt_snprintf(lock_name, sizeof(lock_name), "vn-%04x",
(unsigned int)(path_hash & 0xffffU));
return rt_mutex_init(&vnode->lock, lock_name, RT_IPC_FLAG_PRIO);
}
/**
* @brief Destroy a virtual node (vnode) and free its resources
*
* @param[in] vnode Pointer to the vnode to be destroyed
*
* @return int Always returns 0. Note that this does not guarantee success, as errors may occur internally.
*/
int dfs_vnode_destroy(struct dfs_vnode* vnode)
{
rt_err_t ret = RT_EOK;
if (vnode)
{
ret = dfs_file_lock();
if (ret == RT_EOK)
{
if (rt_atomic_load(&(vnode->ref_count)) == 1)
{
LOG_I("free a vnode: %p", vnode);
#ifdef RT_USING_PAGECACHE
if (vnode->aspace)
{
dfs_aspace_destroy(vnode->aspace);
}
#endif
if (vnode->mnt)
{
DLOG(msg, "vnode", vnode->mnt->fs_ops->name, DLOG_MSG, "fs_ops->free_vnode");
vnode->mnt->fs_ops->free_vnode(vnode);
}
else
{
DLOG(msg, "vnode", "vnode", DLOG_MSG, "destroy vnode(mnt=NULL)");
}
dfs_file_unlock();
rt_free(vnode);
}
else
{
dfs_file_unlock();
}
}
}
return 0;
}
/**
* @brief Increase reference count of a virtual node (vnode)
*
* @param[in,out] vnode Pointer to the vnode to be referenced
*
* @return struct dfs_vnode* The same vnode pointer that was passed in
*/
struct dfs_vnode *dfs_vnode_ref(struct dfs_vnode *vnode)
{
if (vnode)
{
rt_atomic_add(&(vnode->ref_count), 1);
DLOG(note, "vnode", "vnode ref_count=%d", rt_atomic_load(&(vnode->ref_count)));
}
return vnode;
}
/**
* @brief Decrease reference count of a virtual node (vnode) and potentially free it
*
* @param[in,out] vnode Pointer to the vnode to be unreferenced
*/
void dfs_vnode_unref(struct dfs_vnode *vnode)
{
rt_err_t ret = RT_EOK;
if (vnode)
{
ret = dfs_file_lock();
if (ret == RT_EOK)
{
rt_atomic_sub(&(vnode->ref_count), 1);
DLOG(note, "vnode", "vnode ref_count=%d", rt_atomic_load(&(vnode->ref_count)));
#ifdef RT_USING_PAGECACHE
if (vnode->aspace)
{
dfs_aspace_destroy(vnode->aspace);
}
#endif
if (rt_atomic_load(&(vnode->ref_count)) == 0)
{
LOG_I("free a vnode: %p", vnode);
DLOG(msg, "vnode", "vnode", DLOG_MSG, "free vnode, ref_count=0");
if (vnode->mnt)
{
DLOG(msg, "vnode", vnode->mnt->fs_ops->name, DLOG_MSG, "fs_ops->free_vnode");
vnode->mnt->fs_ops->free_vnode(vnode);
}
dfs_file_unlock();
rt_free(vnode);
}
else
{
dfs_file_unlock();
DLOG(note, "vnode", "vnode ref_count=%d", rt_atomic_load(&(vnode->ref_count)));
}
}
}
return;
}
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