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Diffstat (limited to 'mm/userfaultfd.c')
-rw-r--r--mm/userfaultfd.c76
1 files changed, 34 insertions, 42 deletions
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index c3cc6cb04548..a9b19b39413d 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -58,7 +58,7 @@ struct vm_area_struct *find_dst_vma(struct mm_struct *dst_mm,
int mfill_atomic_install_pte(pmd_t *dst_pmd,
struct vm_area_struct *dst_vma,
unsigned long dst_addr, struct page *page,
- bool newly_allocated, bool wp_copy)
+ bool newly_allocated, uffd_flags_t flags)
{
int ret;
struct mm_struct *dst_mm = dst_vma->vm_mm;
@@ -77,7 +77,7 @@ int mfill_atomic_install_pte(pmd_t *dst_pmd,
writable = false;
if (writable)
_dst_pte = pte_mkwrite(_dst_pte);
- if (wp_copy)
+ if (flags & MFILL_ATOMIC_WP)
_dst_pte = pte_mkuffd_wp(_dst_pte);
dst_pte = pte_offset_map_lock(dst_mm, dst_pmd, dst_addr, &ptl);
@@ -132,8 +132,8 @@ static int mfill_atomic_pte_copy(pmd_t *dst_pmd,
struct vm_area_struct *dst_vma,
unsigned long dst_addr,
unsigned long src_addr,
- struct page **pagep,
- bool wp_copy)
+ uffd_flags_t flags,
+ struct page **pagep)
{
void *page_kaddr;
int ret;
@@ -194,7 +194,7 @@ static int mfill_atomic_pte_copy(pmd_t *dst_pmd,
goto out_release;
ret = mfill_atomic_install_pte(dst_pmd, dst_vma, dst_addr,
- page, true, wp_copy);
+ page, true, flags);
if (ret)
goto out_release;
out:
@@ -242,7 +242,7 @@ out_unlock:
static int mfill_atomic_pte_continue(pmd_t *dst_pmd,
struct vm_area_struct *dst_vma,
unsigned long dst_addr,
- bool wp_copy)
+ uffd_flags_t flags)
{
struct inode *inode = file_inode(dst_vma->vm_file);
pgoff_t pgoff = linear_page_index(dst_vma, dst_addr);
@@ -268,7 +268,7 @@ static int mfill_atomic_pte_continue(pmd_t *dst_pmd,
}
ret = mfill_atomic_install_pte(dst_pmd, dst_vma, dst_addr,
- page, false, wp_copy);
+ page, false, flags);
if (ret)
goto out_release;
@@ -313,8 +313,7 @@ static __always_inline ssize_t mfill_atomic_hugetlb(
unsigned long dst_start,
unsigned long src_start,
unsigned long len,
- enum mcopy_atomic_mode mode,
- bool wp_copy)
+ uffd_flags_t flags)
{
struct mm_struct *dst_mm = dst_vma->vm_mm;
int vm_shared = dst_vma->vm_flags & VM_SHARED;
@@ -334,7 +333,7 @@ static __always_inline ssize_t mfill_atomic_hugetlb(
* by THP. Since we can not reliably insert a zero page, this
* feature is not supported.
*/
- if (mode == MCOPY_ATOMIC_ZEROPAGE) {
+ if (uffd_flags_mode_is(flags, MFILL_ATOMIC_ZEROPAGE)) {
mmap_read_unlock(dst_mm);
return -EINVAL;
}
@@ -402,7 +401,7 @@ retry:
goto out_unlock;
}
- if (mode != MCOPY_ATOMIC_CONTINUE &&
+ if (!uffd_flags_mode_is(flags, MFILL_ATOMIC_CONTINUE) &&
!huge_pte_none_mostly(huge_ptep_get(dst_pte))) {
err = -EEXIST;
hugetlb_vma_unlock_read(dst_vma);
@@ -410,9 +409,8 @@ retry:
goto out_unlock;
}
- err = hugetlb_mfill_atomic_pte(dst_pte, dst_vma,
- dst_addr, src_addr, mode, &page,
- wp_copy);
+ err = hugetlb_mfill_atomic_pte(dst_pte, dst_vma, dst_addr,
+ src_addr, flags, &page);
hugetlb_vma_unlock_read(dst_vma);
mutex_unlock(&hugetlb_fault_mutex_table[hash]);
@@ -466,23 +464,21 @@ extern ssize_t mfill_atomic_hugetlb(struct vm_area_struct *dst_vma,
unsigned long dst_start,
unsigned long src_start,
unsigned long len,
- enum mcopy_atomic_mode mode,
- bool wp_copy);
+ uffd_flags_t flags);
#endif /* CONFIG_HUGETLB_PAGE */
static __always_inline ssize_t mfill_atomic_pte(pmd_t *dst_pmd,
struct vm_area_struct *dst_vma,
unsigned long dst_addr,
unsigned long src_addr,
- struct page **page,
- enum mcopy_atomic_mode mode,
- bool wp_copy)
+ uffd_flags_t flags,
+ struct page **pagep)
{
ssize_t err;
- if (mode == MCOPY_ATOMIC_CONTINUE) {
+ if (uffd_flags_mode_is(flags, MFILL_ATOMIC_CONTINUE)) {
return mfill_atomic_pte_continue(dst_pmd, dst_vma,
- dst_addr, wp_copy);
+ dst_addr, flags);
}
/*
@@ -496,18 +492,17 @@ static __always_inline ssize_t mfill_atomic_pte(pmd_t *dst_pmd,
* and not in the radix tree.
*/
if (!(dst_vma->vm_flags & VM_SHARED)) {
- if (mode == MCOPY_ATOMIC_NORMAL)
+ if (uffd_flags_mode_is(flags, MFILL_ATOMIC_COPY))
err = mfill_atomic_pte_copy(dst_pmd, dst_vma,
- dst_addr, src_addr, page,
- wp_copy);
+ dst_addr, src_addr,
+ flags, pagep);
else
err = mfill_atomic_pte_zeropage(dst_pmd,
dst_vma, dst_addr);
} else {
err = shmem_mfill_atomic_pte(dst_pmd, dst_vma,
dst_addr, src_addr,
- mode != MCOPY_ATOMIC_NORMAL,
- wp_copy, page);
+ flags, pagep);
}
return err;
@@ -517,9 +512,8 @@ static __always_inline ssize_t mfill_atomic(struct mm_struct *dst_mm,
unsigned long dst_start,
unsigned long src_start,
unsigned long len,
- enum mcopy_atomic_mode mcopy_mode,
atomic_t *mmap_changing,
- __u64 mode)
+ uffd_flags_t flags)
{
struct vm_area_struct *dst_vma;
ssize_t err;
@@ -527,7 +521,6 @@ static __always_inline ssize_t mfill_atomic(struct mm_struct *dst_mm,
unsigned long src_addr, dst_addr;
long copied;
struct page *page;
- bool wp_copy;
/*
* Sanitize the command parameters:
@@ -577,8 +570,7 @@ retry:
* validate 'mode' now that we know the dst_vma: don't allow
* a wrprotect copy if the userfaultfd didn't register as WP.
*/
- wp_copy = mode & UFFDIO_COPY_MODE_WP;
- if (wp_copy && !(dst_vma->vm_flags & VM_UFFD_WP))
+ if ((flags & MFILL_ATOMIC_WP) && !(dst_vma->vm_flags & VM_UFFD_WP))
goto out_unlock;
/*
@@ -586,12 +578,12 @@ retry:
*/
if (is_vm_hugetlb_page(dst_vma))
return mfill_atomic_hugetlb(dst_vma, dst_start,
- src_start, len, mcopy_mode,
- wp_copy);
+ src_start, len, flags);
if (!vma_is_anonymous(dst_vma) && !vma_is_shmem(dst_vma))
goto out_unlock;
- if (!vma_is_shmem(dst_vma) && mcopy_mode == MCOPY_ATOMIC_CONTINUE)
+ if (!vma_is_shmem(dst_vma) &&
+ uffd_flags_mode_is(flags, MFILL_ATOMIC_CONTINUE))
goto out_unlock;
/*
@@ -639,7 +631,7 @@ retry:
BUG_ON(pmd_trans_huge(*dst_pmd));
err = mfill_atomic_pte(dst_pmd, dst_vma, dst_addr,
- src_addr, &page, mcopy_mode, wp_copy);
+ src_addr, flags, &page);
cond_resched();
if (unlikely(err == -ENOENT)) {
@@ -687,24 +679,24 @@ out:
ssize_t mfill_atomic_copy(struct mm_struct *dst_mm, unsigned long dst_start,
unsigned long src_start, unsigned long len,
- atomic_t *mmap_changing, __u64 mode)
+ atomic_t *mmap_changing, uffd_flags_t flags)
{
- return mfill_atomic(dst_mm, dst_start, src_start, len,
- MCOPY_ATOMIC_NORMAL, mmap_changing, mode);
+ return mfill_atomic(dst_mm, dst_start, src_start, len, mmap_changing,
+ uffd_flags_set_mode(flags, MFILL_ATOMIC_COPY));
}
ssize_t mfill_atomic_zeropage(struct mm_struct *dst_mm, unsigned long start,
unsigned long len, atomic_t *mmap_changing)
{
- return mfill_atomic(dst_mm, start, 0, len, MCOPY_ATOMIC_ZEROPAGE,
- mmap_changing, 0);
+ return mfill_atomic(dst_mm, start, 0, len, mmap_changing,
+ uffd_flags_set_mode(0, MFILL_ATOMIC_ZEROPAGE));
}
ssize_t mfill_atomic_continue(struct mm_struct *dst_mm, unsigned long start,
unsigned long len, atomic_t *mmap_changing)
{
- return mfill_atomic(dst_mm, start, 0, len, MCOPY_ATOMIC_CONTINUE,
- mmap_changing, 0);
+ return mfill_atomic(dst_mm, start, 0, len, mmap_changing,
+ uffd_flags_set_mode(0, MFILL_ATOMIC_CONTINUE));
}
long uffd_wp_range(struct vm_area_struct *dst_vma,
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 16:17:15 +0100