From c6011b96501253a2391c13074ea355d128c6e4d1 Mon Sep 17 00:00:00 2001
From: Cautreoxit <huk@stu.pku.edu.cn>
Date: Mon, 2 Jun 2025 16:49:46 +0800
Subject: [PATCH] Add fadvise64 syscall

---
 docs/src/kernel/linux-compatibility.md |  2 +-
 kernel/src/syscall/arch/riscv.rs       |  2 +
 kernel/src/syscall/arch/x86.rs         |  2 +
 kernel/src/syscall/fadvise64.rs        | 57 ++++++++++++++++++++++++++
 kernel/src/syscall/mod.rs              |  1 +
 test/src/syscall/ltp/testcases/all.txt |  8 ++--
 6 files changed, 67 insertions(+), 5 deletions(-)
 create mode 100644 kernel/src/syscall/fadvise64.rs

diff --git a/docs/src/kernel/linux-compatibility.md b/docs/src/kernel/linux-compatibility.md
index 026c92191..b668625c9 100644
--- a/docs/src/kernel/linux-compatibility.md
+++ b/docs/src/kernel/linux-compatibility.md
@@ -241,7 +241,7 @@ provided by Linux on x86-64 architecture.
 | 218     | set_tid_address  | ✅              |
 | 219     | restart_syscall  | ❌              |
 | 220     | semtimedop       | ✅              |
-| 221     | fadvise64        | ❌              |
+| 221     | fadvise64        | ✅              |
 | 222     | timer_create     | ✅              |
 | 223     | timer_settime    | ✅              |
 | 224     | timer_gettime    | ✅              |
diff --git a/kernel/src/syscall/arch/riscv.rs b/kernel/src/syscall/arch/riscv.rs
index 5c5b74e47..8e9bb4588 100644
--- a/kernel/src/syscall/arch/riscv.rs
+++ b/kernel/src/syscall/arch/riscv.rs
@@ -23,6 +23,7 @@ use super::{
     execve::{sys_execve, sys_execveat},
     exit::sys_exit,
     exit_group::sys_exit_group,
+    fadvise64::sys_fadvise64,
     fallocate::sys_fallocate,
     fcntl::sys_fcntl,
     flock::sys_flock,
@@ -284,6 +285,7 @@ impl_syscall_nums_and_dispatch_fn! {
     SYS_CLONE = 220              => sys_clone(args[..5], &user_ctx);
     SYS_EXECVE = 221             => sys_execve(args[..3], &mut user_ctx);
     SYS_MMAP = 222               => sys_mmap(args[..6]);
+    SYS_FADVISE64 = 223          => sys_fadvise64(args[..4]);
     SYS_MPROTECT = 226           => sys_mprotect(args[..3]);
     SYS_MSYNC = 227              => sys_msync(args[..3]);
     SYS_MADVISE = 233            => sys_madvise(args[..3]);
diff --git a/kernel/src/syscall/arch/x86.rs b/kernel/src/syscall/arch/x86.rs
index 3a7117d65..b25a560e7 100644
--- a/kernel/src/syscall/arch/x86.rs
+++ b/kernel/src/syscall/arch/x86.rs
@@ -28,6 +28,7 @@ use super::{
     execve::{sys_execve, sys_execveat},
     exit::sys_exit,
     exit_group::sys_exit_group,
+    fadvise64::sys_fadvise64,
     fallocate::sys_fallocate,
     fcntl::sys_fcntl,
     flock::sys_flock,
@@ -321,6 +322,7 @@ impl_syscall_nums_and_dispatch_fn! {
     SYS_GETDENTS64 = 217       => sys_getdents64(args[..3]);
     SYS_SET_TID_ADDRESS = 218  => sys_set_tid_address(args[..1]);
     SYS_SEMTIMEDOP = 220       => sys_semtimedop(args[..4]);
+    SYS_FADVISE64 = 221        => sys_fadvise64(args[..4]);
     SYS_TIMER_CREATE = 222     => sys_timer_create(args[..3]);
     SYS_TIMER_SETTIME = 223    => sys_timer_settime(args[..4]);
     SYS_TIMER_GETTIME = 224    => sys_timer_gettime(args[..2]);
diff --git a/kernel/src/syscall/fadvise64.rs b/kernel/src/syscall/fadvise64.rs
new file mode 100644
index 000000000..8f1886198
--- /dev/null
+++ b/kernel/src/syscall/fadvise64.rs
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use super::SyscallReturn;
+use crate::{fs::file_table::get_file_fast, prelude::*};
+
+#[repr(i32)]
+#[derive(Debug, TryFromInt)]
+enum FadviseBehavior {
+    Normal = 0,
+    Random = 1,
+    Sequential = 2,
+    Willneed = 3,
+    Dontneed = 4,
+    Noreuse = 5,
+}
+
+pub fn sys_fadvise64(
+    fd: i32,
+    offset: usize,
+    len: usize,
+    advice: i32,
+    ctx: &Context,
+) -> Result<SyscallReturn> {
+    let behavior = FadviseBehavior::try_from(advice)
+        .map_err(|_| Error::with_message(Errno::EINVAL, "invalid fadvise behavior:"))?;
+
+    debug!(
+        "fd={}, offset={}, len={}, behavior={:?}",
+        fd, offset, len, behavior
+    );
+
+    let mut file_table = ctx.thread_local.borrow_file_table_mut();
+    let _file = get_file_fast!(&mut file_table, fd);
+
+    match behavior {
+        FadviseBehavior::Normal => {
+            warn!("POSIX_FADV_NORMAL is ignored");
+        }
+        FadviseBehavior::Random => {
+            warn!("POSIX_FADV_RANDOM is ignored");
+        }
+        FadviseBehavior::Sequential => {
+            warn!("POSIX_FADV_SEQUENTIAL is ignored");
+        }
+        FadviseBehavior::Willneed => {
+            warn!("POSIX_FADV_WILLNEED is ignored");
+        }
+        FadviseBehavior::Dontneed => {
+            warn!("POSIX_FADV_DONTNEED is ignored");
+        }
+        FadviseBehavior::Noreuse => {
+            warn!("POSIX_FADV_NOREUSE is ignored");
+        }
+    }
+
+    Ok(SyscallReturn::Return(0))
+}
diff --git a/kernel/src/syscall/mod.rs b/kernel/src/syscall/mod.rs
index 8c7c5d021..cdb57f1a8 100644
--- a/kernel/src/syscall/mod.rs
+++ b/kernel/src/syscall/mod.rs
@@ -37,6 +37,7 @@ mod eventfd;
 mod execve;
 mod exit;
 mod exit_group;
+mod fadvise64;
 mod fallocate;
 mod fcntl;
 mod flock;
diff --git a/test/src/syscall/ltp/testcases/all.txt b/test/src/syscall/ltp/testcases/all.txt
index 55700d318..e5328042c 100644
--- a/test/src/syscall/ltp/testcases/all.txt
+++ b/test/src/syscall/ltp/testcases/all.txt
@@ -249,10 +249,10 @@ fallocate03
 #posix_fadvise test cases
 # posix_fadvise01
 # posix_fadvise01_64
-# posix_fadvise02
-# posix_fadvise02_64
-# posix_fadvise03
-# posix_fadvise03_64
+posix_fadvise02
+posix_fadvise02_64
+posix_fadvise03
+posix_fadvise03_64
 # posix_fadvise04
 # posix_fadvise04_64