42 lines
1.2 KiB
Rust
42 lines
1.2 KiB
Rust
// SPDX-License-Identifier: MPL-2.0
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use crate::{
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fs::{
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procfs::template::{FileOps, ProcFileBuilder},
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utils::{mkmod, Inode},
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},
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prelude::*,
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process::posix_thread::AsPosixThread,
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thread::Thread,
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};
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/// Represents the inode at `/proc/[pid]/task/[tid]/mountinfo` (and also `/proc/[pid]/mountinfo`).
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pub struct MountInfoFileOps {
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thread_ref: Arc<Thread>,
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}
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impl MountInfoFileOps {
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pub fn new_inode(thread_ref: Arc<Thread>, parent: Weak<dyn Inode>) -> Arc<dyn Inode> {
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// Reference: <https://elixir.bootlin.com/linux/v6.16.5/source/fs/proc/base.c#L3352>
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ProcFileBuilder::new(Self { thread_ref }, mkmod!(a+r))
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.parent(parent)
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.build()
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.unwrap()
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}
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}
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impl FileOps for MountInfoFileOps {
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fn data(&self) -> Result<Vec<u8>> {
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unreachable!()
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}
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fn read_at(&self, offset: usize, writer: &mut VmWriter) -> Result<usize> {
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let posix_thread = self.thread_ref.as_posix_thread().unwrap();
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let fs = posix_thread.read_fs();
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let fs_resolver = fs.resolver().read();
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let root_mount = fs_resolver.root().mount_node();
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root_mount.read_mount_info(offset, writer)
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}
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}
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