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[PATCH] Hugetlb: Reorganize hugetlb_fault to prepare for COW

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This patch splits the "no_page()" type activity into its own function,
hugetlb_no_page().  hugetlb_fault() becomes the entry point for hugetlb faults
and delegates to the appropriate handler depending on the type of fault.
Right now we still have only hugetlb_no_page() but a later patch introduces a
COW fault.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Adam Litke <agl@us.ibm.com>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "Seth, Rohit" <rohit.seth@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Adam Litke 2006-01-06 00:10:43 -08:00 committed by Linus Torvalds
parent 85ef47f74a
commit 86e5216f8d
1 changed files with 25 additions and 9 deletions
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34
mm/hugetlb.c
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@ -376,20 +376,15 @@ out:
return page;
}
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, int write_access)
int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
{
int ret = VM_FAULT_SIGBUS;
unsigned long idx;
unsigned long size;
pte_t *pte;
struct page *page;
struct address_space *mapping;
pte = huge_pte_alloc(mm, address);
if (!pte)
goto out;
mapping = vma->vm_file->f_mapping;
idx = ((address - vma->vm_start) >> HPAGE_SHIFT)
+ (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
@ -408,11 +403,11 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
goto backout;
ret = VM_FAULT_MINOR;
if (!pte_none(*pte))
if (!pte_none(*ptep))
goto backout;
add_mm_counter(mm, file_rss, HPAGE_SIZE / PAGE_SIZE);
set_huge_pte_at(mm, address, pte, make_huge_pte(vma, page));
set_huge_pte_at(mm, address, ptep, make_huge_pte(vma, page));
spin_unlock(&mm->page_table_lock);
unlock_page(page);
out:
@ -426,6 +421,27 @@ backout:
goto out;
}
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, int write_access)
{
pte_t *ptep;
pte_t entry;
ptep = huge_pte_alloc(mm, address);
if (!ptep)
return VM_FAULT_OOM;
entry = *ptep;
if (pte_none(entry))
return hugetlb_no_page(mm, vma, address, ptep);
/*
* We could get here if another thread instantiated the pte
* before the test above.
*/
return VM_FAULT_MINOR;
}
int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
struct page **pages, struct vm_area_struct **vmas,
unsigned long *position, int *length, int i)