1 use system_error::SystemError; 2 3 use crate::arch::{mm::PageMapper, MMArch}; 4 5 use super::{page::Flusher, syscall::MadvFlags, ucontext::LockedVMA, VmFlags}; 6 7 impl LockedVMA { 8 pub fn do_madvise( 9 &self, 10 behavior: MadvFlags, 11 _mapper: &mut PageMapper, 12 _flusher: impl Flusher<MMArch>, 13 ) -> Result<(), SystemError> { 14 //TODO https://code.dragonos.org.cn/xref/linux-6.6.21/mm/madvise.c?fi=madvise#do_madvise 15 let mut vma = self.lock(); 16 let mut new_flags = *vma.vm_flags(); 17 match behavior { 18 MadvFlags::MADV_REMOVE => { 19 // TODO 20 } 21 22 MadvFlags::MADV_WILLNEED => { 23 // TODO 24 } 25 26 MadvFlags::MADV_COLD => { 27 // TODO 28 } 29 30 MadvFlags::MADV_PAGEOUT => { 31 // TODO 32 } 33 34 MadvFlags::MADV_FREE => { 35 // TODO 36 } 37 38 MadvFlags::MADV_POPULATE_READ | MadvFlags::MADV_POPULATE_WRITE => { 39 // TODO 40 } 41 42 MadvFlags::MADV_NORMAL => { 43 new_flags = new_flags & !VmFlags::VM_RAND_READ & !VmFlags::VM_SEQ_READ 44 } 45 46 MadvFlags::MADV_SEQUENTIAL => { 47 new_flags = (new_flags & !VmFlags::VM_RAND_READ) | VmFlags::VM_SEQ_READ 48 } 49 MadvFlags::MADV_RANDOM => { 50 new_flags = (new_flags & !VmFlags::VM_SEQ_READ) | VmFlags::VM_RAND_READ 51 } 52 53 MadvFlags::MADV_DONTFORK => new_flags |= VmFlags::VM_DONTCOPY, 54 55 MadvFlags::MADV_DOFORK => { 56 if vma.vm_flags().contains(VmFlags::VM_IO) { 57 return Err(SystemError::EINVAL); 58 } 59 new_flags &= !VmFlags::VM_DONTCOPY; 60 } 61 62 MadvFlags::MADV_WIPEONFORK => { 63 //MADV_WIPEONFORK仅支持匿名映射，后续实现其他映射方式后要在此处添加判断条件 64 new_flags |= VmFlags::VM_WIPEONFORK; 65 } 66 67 MadvFlags::MADV_KEEPONFORK => new_flags &= !VmFlags::VM_WIPEONFORK, 68 69 MadvFlags::MADV_DONTDUMP => new_flags |= VmFlags::VM_DONTDUMP, 70 71 //MADV_DODUMP不支持巨页映射，后续需要添加判断条件 72 MadvFlags::MADV_DODUMP => new_flags &= !VmFlags::VM_DONTDUMP, 73 74 MadvFlags::MADV_MERGEABLE | MadvFlags::MADV_UNMERGEABLE => {} 75 76 MadvFlags::MADV_HUGEPAGE | MadvFlags::MADV_NOHUGEPAGE => {} 77 78 MadvFlags::MADV_COLLAPSE => {} 79 _ => {} 80 } 81 vma.set_vm_flags(new_flags); 82 Ok(()) 83 } 84 } 85