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Align `MS_ASYNC` and `MS_SYNC` flags with Linux behavior

This commit is contained in:
Tao Su 2025-08-14 03:53:34 +00:00 committed by Tate, Hongliang Tian
parent 18456a10d9
commit c15106734a
1 changed files with 5 additions and 4 deletions
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9
kernel/src/syscall/msync.rs
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@ -13,7 +13,7 @@ bitflags! {
/// Performs `msync` asynchronously.
const MS_ASYNC = 0x01;
/// Invalidates cache so that other processes mapping the same file
/// will immediately see the changes before this `msync` call.
/// will immediately see the changes after this `msync` call.
///
/// Should be a no-op since we use the same page cache for all processes.
const MS_INVALIDATE = 0x02;
@ -89,10 +89,11 @@ pub fn sys_msync(start: Vaddr, size: usize, flag: i32, ctx: &Context) -> Result<
}
};
if flags.contains(MsyncFlags::MS_ASYNC) {
ThreadOptions::new(task_fn).spawn();
} else {
// If neither MS_SYNC nor MS_ASYNC is specified, Linux defaults to MS_ASYNC behavior.
if flags.contains(MsyncFlags::MS_SYNC) {
task_fn();
} else {
ThreadOptions::new(task_fn).spawn();
}
Ok(SyscallReturn::Return(0))