os/fs/sysfs/builders/
block.rs

1//! 块设备 sysfs 树构建器
2//!
3//! 在 /sys/class/block/ 下创建指向 /sys/devices/platform/ 的符号链接
4
5use alloc::format;
6use alloc::sync::Arc;
7
8use crate::fs::sysfs::device_registry;
9use crate::fs::sysfs::inode::SysfsInode;
10use crate::vfs::{FsError, Inode};
11
12/// 构建块设备 sysfs 树
13///
14/// 在 /sys/class/block/ 下创建指向 /sys/devices/platform/<device>/ 的符号链接
15pub fn build_block_devices(root: &Arc<SysfsInode>) -> Result<(), FsError> {
16    // 获取 /sys/class/block/
17    let class_inode = root.lookup("class")?;
18    let class = class_inode
19        .downcast_ref::<SysfsInode>()
20        .ok_or(FsError::InvalidArgument)?;
21
22    let block_inode = class.lookup("block")?;
23    let block_dir = block_inode
24        .downcast_ref::<SysfsInode>()
25        .ok_or(FsError::InvalidArgument)?;
26
27    // 为每个块设备创建符号链接
28    for dev_info in device_registry::list_block_devices() {
29        // 创建符号链接: /sys/class/block/vda -> ../../devices/platform/vda
30        let target = format!("../../devices/platform/{}", dev_info.name);
31        let symlink = SysfsInode::new_symlink(target);
32        block_dir.add_child(&dev_info.name, symlink)?;
33    }
34
35    Ok(())
36}
os/fs/sysfs/builders/block.rs

os/fs/sysfs/builders/
block.rs
