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mm: move mm_populate()-related code to mm/gup.c
It's odd that we have populate_vma_page_range() and __mm_populate() in mm/mlock.c. It's implementation of generic memory population and mlocking is one of possible side effect, if VM_LOCKED is set. __get_user_pages() is core of the implementation. Let's move the code into mm/gup.c. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: David Rientjes <rientjes@google.com> Cc: Michel Lespinasse <walken@google.com> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov
Linus Torvalds
parent
c561259ca7
commit
acc3c8d15e
118
mm/gup.c
118
mm/gup.c
@ -818,6 +818,124 @@ long get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
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}
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EXPORT_SYMBOL(get_user_pages);
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/**
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* populate_vma_page_range() - populate a range of pages in the vma.
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* @vma: target vma
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* @start: start address
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* @end: end address
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* @nonblocking:
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*
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* This takes care of mlocking the pages too if VM_LOCKED is set.
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*
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* return 0 on success, negative error code on error.
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*
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* vma->vm_mm->mmap_sem must be held.
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*
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* If @nonblocking is NULL, it may be held for read or write and will
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* be unperturbed.
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*
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* If @nonblocking is non-NULL, it must held for read only and may be
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* released. If it's released, *@nonblocking will be set to 0.
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*/
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long populate_vma_page_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end, int *nonblocking)
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{
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struct mm_struct *mm = vma->vm_mm;
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unsigned long nr_pages = (end - start) / PAGE_SIZE;
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int gup_flags;
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VM_BUG_ON(start & ~PAGE_MASK);
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VM_BUG_ON(end & ~PAGE_MASK);
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VM_BUG_ON_VMA(start < vma->vm_start, vma);
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VM_BUG_ON_VMA(end > vma->vm_end, vma);
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VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_sem), mm);
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gup_flags = FOLL_TOUCH | FOLL_POPULATE;
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/*
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* We want to touch writable mappings with a write fault in order
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* to break COW, except for shared mappings because these don't COW
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* and we would not want to dirty them for nothing.
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*/
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if ((vma->vm_flags & (VM_WRITE | VM_SHARED)) == VM_WRITE)
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gup_flags |= FOLL_WRITE;
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/*
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* We want mlock to succeed for regions that have any permissions
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* other than PROT_NONE.
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*/
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if (vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC))
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gup_flags |= FOLL_FORCE;
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/*
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* We made sure addr is within a VMA, so the following will
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* not result in a stack expansion that recurses back here.
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*/
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return __get_user_pages(current, mm, start, nr_pages, gup_flags,
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NULL, NULL, nonblocking);
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}
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/*
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* __mm_populate - populate and/or mlock pages within a range of address space.
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*
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* This is used to implement mlock() and the MAP_POPULATE / MAP_LOCKED mmap
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* flags. VMAs must be already marked with the desired vm_flags, and
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* mmap_sem must not be held.
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*/
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int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
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{
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struct mm_struct *mm = current->mm;
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unsigned long end, nstart, nend;
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struct vm_area_struct *vma = NULL;
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int locked = 0;
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long ret = 0;
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VM_BUG_ON(start & ~PAGE_MASK);
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VM_BUG_ON(len != PAGE_ALIGN(len));
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end = start + len;
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for (nstart = start; nstart < end; nstart = nend) {
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/*
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* We want to fault in pages for [nstart; end) address range.
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* Find first corresponding VMA.
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*/
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if (!locked) {
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locked = 1;
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down_read(&mm->mmap_sem);
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vma = find_vma(mm, nstart);
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} else if (nstart >= vma->vm_end)
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vma = vma->vm_next;
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if (!vma || vma->vm_start >= end)
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break;
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/*
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* Set [nstart; nend) to intersection of desired address
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* range with the first VMA. Also, skip undesirable VMA types.
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*/
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nend = min(end, vma->vm_end);
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if (vma->vm_flags & (VM_IO | VM_PFNMAP))
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continue;
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if (nstart < vma->vm_start)
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nstart = vma->vm_start;
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/*
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* Now fault in a range of pages. populate_vma_page_range()
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* double checks the vma flags, so that it won't mlock pages
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* if the vma was already munlocked.
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*/
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ret = populate_vma_page_range(vma, nstart, nend, &locked);
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if (ret < 0) {
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if (ignore_errors) {
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ret = 0;
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continue; /* continue at next VMA */
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}
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break;
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}
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nend = nstart + ret * PAGE_SIZE;
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ret = 0;
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}
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if (locked)
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up_read(&mm->mmap_sem);
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return ret; /* 0 or negative error code */
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}
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/**
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* get_dump_page() - pin user page in memory while writing it to core dump
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* @addr: user address
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118
mm/mlock.c
118
mm/mlock.c
@ -205,62 +205,6 @@ unsigned int munlock_vma_page(struct page *page)
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return nr_pages - 1;
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}
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/**
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* populate_vma_page_range() - populate a range of pages in the vma.
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* @vma: target vma
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* @start: start address
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* @end: end address
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* @nonblocking:
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*
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* This takes care of mlocking the pages too if VM_LOCKED is set.
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*
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* return 0 on success, negative error code on error.
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*
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* vma->vm_mm->mmap_sem must be held.
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*
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* If @nonblocking is NULL, it may be held for read or write and will
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* be unperturbed.
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*
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* If @nonblocking is non-NULL, it must held for read only and may be
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* released. If it's released, *@nonblocking will be set to 0.
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*/
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long populate_vma_page_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end, int *nonblocking)
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{
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struct mm_struct *mm = vma->vm_mm;
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unsigned long nr_pages = (end - start) / PAGE_SIZE;
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int gup_flags;
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VM_BUG_ON(start & ~PAGE_MASK);
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VM_BUG_ON(end & ~PAGE_MASK);
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VM_BUG_ON_VMA(start < vma->vm_start, vma);
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VM_BUG_ON_VMA(end > vma->vm_end, vma);
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VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_sem), mm);
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gup_flags = FOLL_TOUCH | FOLL_POPULATE;
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/*
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* We want to touch writable mappings with a write fault in order
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* to break COW, except for shared mappings because these don't COW
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* and we would not want to dirty them for nothing.
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*/
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if ((vma->vm_flags & (VM_WRITE | VM_SHARED)) == VM_WRITE)
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gup_flags |= FOLL_WRITE;
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/*
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* We want mlock to succeed for regions that have any permissions
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* other than PROT_NONE.
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*/
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if (vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC))
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gup_flags |= FOLL_FORCE;
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/*
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* We made sure addr is within a VMA, so the following will
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* not result in a stack expansion that recurses back here.
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*/
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return __get_user_pages(current, mm, start, nr_pages, gup_flags,
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NULL, NULL, nonblocking);
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}
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/*
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* convert get_user_pages() return value to posix mlock() error
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*/
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@ -660,68 +604,6 @@ static int do_mlock(unsigned long start, size_t len, int on)
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return error;
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}
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/*
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* __mm_populate - populate and/or mlock pages within a range of address space.
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*
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* This is used to implement mlock() and the MAP_POPULATE / MAP_LOCKED mmap
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* flags. VMAs must be already marked with the desired vm_flags, and
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* mmap_sem must not be held.
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*/
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int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
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{
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struct mm_struct *mm = current->mm;
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unsigned long end, nstart, nend;
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struct vm_area_struct *vma = NULL;
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int locked = 0;
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long ret = 0;
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VM_BUG_ON(start & ~PAGE_MASK);
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VM_BUG_ON(len != PAGE_ALIGN(len));
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end = start + len;
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for (nstart = start; nstart < end; nstart = nend) {
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/*
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* We want to fault in pages for [nstart; end) address range.
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* Find first corresponding VMA.
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*/
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if (!locked) {
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locked = 1;
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down_read(&mm->mmap_sem);
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vma = find_vma(mm, nstart);
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} else if (nstart >= vma->vm_end)
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vma = vma->vm_next;
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if (!vma || vma->vm_start >= end)
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break;
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/*
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* Set [nstart; nend) to intersection of desired address
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* range with the first VMA. Also, skip undesirable VMA types.
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*/
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nend = min(end, vma->vm_end);
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if (vma->vm_flags & (VM_IO | VM_PFNMAP))
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continue;
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if (nstart < vma->vm_start)
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nstart = vma->vm_start;
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/*
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* Now fault in a range of pages. populate_vma_page_range()
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* double checks the vma flags, so that it won't mlock pages
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* if the vma was already munlocked.
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*/
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ret = populate_vma_page_range(vma, nstart, nend, &locked);
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if (ret < 0) {
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if (ignore_errors) {
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ret = 0;
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continue; /* continue at next VMA */
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}
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break;
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}
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nend = nstart + ret * PAGE_SIZE;
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ret = 0;
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}
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if (locked)
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up_read(&mm->mmap_sem);
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return ret; /* 0 or negative error code */
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}
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SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len)
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{
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unsigned long locked;
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