use alloc::{ borrow::ToOwned, string::{String, ToString}, sync::Arc, }; use system_error::SystemError; use crate::{driver::base::kobject::KObject, filesystem::kernfs::KernFSInode}; use super::SysFS; impl SysFS { /// 在sysfs中创建一个符号链接 /// /// ## 参数 /// /// - `kobj`: object whose directory we're creating the link in. (符号链接所在目录) /// 如果为None,则创建在sysfs的根目录下 /// - `target`: object we're pointing to. /// - `name`: 符号链接的名称 /// /// 参考:https://code.dragonos.org.cn/xref/linux-6.1.9/fs/sysfs/symlink.c#89 pub fn create_link( &self, kobj: Option<&Arc>, target: &Arc, name: String, ) -> Result<(), SystemError> { return self.do_create_link(kobj, target, name, true); } /// 在sysfs中删除一个符号链接 /// /// ## 参数 /// /// - `kobj`: 要删除符号链接的kobject(符号链接所在目录) /// - `name`: 符号链接的名称 /// /// /// 参考:https://code.dragonos.org.cn/xref/linux-6.1.9/fs/sysfs/symlink.c#143 pub fn remove_link(&self, _kobj: &Arc, _name: String) { todo!("sysfs remove link") } fn do_create_link( &self, kobj: Option<&Arc>, target: &Arc, name: String, warn: bool, ) -> Result<(), SystemError> { let parent = if let Some(kobj) = kobj { kobj.inode() } else { Some(self.root_inode().clone()) }; // 没有parent,返回错误 let parent = parent.ok_or(SystemError::EFAULT)?; return self.do_create_link_sd(&parent, target, name, warn); } /// 参考 https://code.dragonos.org.cn/xref/linux-6.1.9/fs/sysfs/symlink.c#20 fn do_create_link_sd( &self, inode: &Arc, target: &Arc, name: String, warn: bool, ) -> Result<(), SystemError> { let target_inode = target.inode().ok_or(SystemError::ENOENT)?; let target_abs_path = "/sys".to_string() + &self.kernfs_path(&target_inode).to_owned(); // let current_path = self.kernfs_path(inode); // kdebug!("sysfs: create link {} to {}", current_path, target_abs_path); let kn = inode.add_link(name.clone(), &target_inode, target_abs_path); if kn.is_ok() { return Ok(()); } let err = kn.unwrap_err(); if warn && err == SystemError::EEXIST { self.warn_duplicate(inode, &name); } return Err(err); } /// sysfs_create_link_sd - create symlink to a given object. /// /// ## 参数 /// /// - `inode`: 目录inode,在这个目录下创建符号链接 /// - `target`: object we're pointing to. /// - `name`: 符号链接的名称 #[allow(dead_code)] pub(super) fn create_link_sd( &self, inode: &Arc, target: &Arc, name: String, ) -> Result<(), SystemError> { return self.do_create_link_sd(inode, target, name, true); } }