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-rw-r--r--mm/fremap.c85
1 files changed, 16 insertions, 69 deletions
diff --git a/mm/fremap.c b/mm/fremap.c
index 01e51f0..5f50d73 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -20,13 +20,14 @@
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
-static int zap_pte(struct mm_struct *mm, struct vm_area_struct *vma,
+static void zap_pte(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep)
{
pte_t pte = *ptep;
- struct page *page = NULL;
if (pte_present(pte)) {
+ struct page *page;
+
flush_cache_page(vma, addr, pte_pfn(pte));
pte = ptep_clear_flush(vma, addr, ptep);
page = vm_normal_page(vma, addr, pte);
@@ -35,68 +36,21 @@ static int zap_pte(struct mm_struct *mm, struct vm_area_struct *vma,
set_page_dirty(page);
page_remove_rmap(page, vma);
page_cache_release(page);
+ update_hiwater_rss(mm);
+ dec_mm_counter(mm, file_rss);
}
} else {
if (!pte_file(pte))
free_swap_and_cache(pte_to_swp_entry(pte));
pte_clear_not_present_full(mm, addr, ptep, 0);
}
- return !!page;
}
/*
- * Install a file page to a given virtual memory address, release any
- * previously existing mapping.
- */
-int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long addr, struct page *page, pgprot_t prot)
-{
- struct inode *inode;
- pgoff_t size;
- int err = -ENOMEM;
- pte_t *pte;
- pte_t pte_val;
- spinlock_t *ptl;
-
- pte = get_locked_pte(mm, addr, &ptl);
- if (!pte)
- goto out;
-
- /*
- * This page may have been truncated. Tell the
- * caller about it.
- */
- err = -EINVAL;
- inode = vma->vm_file->f_mapping->host;
- size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
- if (!page->mapping || page->index >= size)
- goto unlock;
- err = -ENOMEM;
- if (page_mapcount(page) > INT_MAX/2)
- goto unlock;
-
- if (pte_none(*pte) || !zap_pte(mm, vma, addr, pte))
- inc_mm_counter(mm, file_rss);
-
- flush_icache_page(vma, page);
- pte_val = mk_pte(page, prot);
- set_pte_at(mm, addr, pte, pte_val);
- page_add_file_rmap(page);
- update_mmu_cache(vma, addr, pte_val);
- lazy_mmu_prot_update(pte_val);
- err = 0;
-unlock:
- pte_unmap_unlock(pte, ptl);
-out:
- return err;
-}
-EXPORT_SYMBOL(install_page);
-
-/*
* Install a file pte to a given virtual memory address, release any
* previously existing mapping.
*/
-int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
+static int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, unsigned long pgoff, pgprot_t prot)
{
int err = -ENOMEM;
@@ -107,10 +61,8 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
if (!pte)
goto out;
- if (!pte_none(*pte) && zap_pte(mm, vma, addr, pte)) {
- update_hiwater_rss(mm);
- dec_mm_counter(mm, file_rss);
- }
+ if (!pte_none(*pte))
+ zap_pte(mm, vma, addr, pte);
set_pte_at(mm, addr, pte, pgoff_to_pte(pgoff));
/*
@@ -208,8 +160,7 @@ asmlinkage long sys_remap_file_pages(unsigned long start, unsigned long size,
if (vma->vm_private_data && !(vma->vm_flags & VM_NONLINEAR))
goto out;
- if ((!vma->vm_ops || !vma->vm_ops->populate) &&
- !(vma->vm_flags & VM_CAN_NONLINEAR))
+ if (!vma->vm_flags & VM_CAN_NONLINEAR)
goto out;
if (end <= start || start < vma->vm_start || end > vma->vm_end)
@@ -239,18 +190,14 @@ asmlinkage long sys_remap_file_pages(unsigned long start, unsigned long size,
spin_unlock(&mapping->i_mmap_lock);
}
- if (vma->vm_flags & VM_CAN_NONLINEAR) {
- err = populate_range(mm, vma, start, size, pgoff);
- if (!err && !(flags & MAP_NONBLOCK)) {
- if (unlikely(has_write_lock)) {
- downgrade_write(&mm->mmap_sem);
- has_write_lock = 0;
- }
- make_pages_present(start, start+size);
+ err = populate_range(mm, vma, start, size, pgoff);
+ if (!err && !(flags & MAP_NONBLOCK)) {
+ if (unlikely(has_write_lock)) {
+ downgrade_write(&mm->mmap_sem);
+ has_write_lock = 0;
}
- } else
- err = vma->vm_ops->populate(vma, start, size, vma->vm_page_prot,
- pgoff, flags & MAP_NONBLOCK);
+ make_pages_present(start, start+size);
+ }
/*
* We can't clear VM_NONLINEAR because we'd have to do
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