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Diffstat (limited to 'mm/fremap.c')
-rw-r--r--mm/fremap.c86
1 files changed, 40 insertions, 46 deletions
diff --git a/mm/fremap.c b/mm/fremap.c
index ab23a0673c35..d862be3bc3e3 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -20,33 +20,32 @@
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
-static inline void zap_pte(struct mm_struct *mm, struct vm_area_struct *vma,
+static int 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_none(pte))
- return;
if (pte_present(pte)) {
unsigned long pfn = pte_pfn(pte);
-
flush_cache_page(vma, addr, pfn);
pte = ptep_clear_flush(vma, addr, ptep);
- if (pfn_valid(pfn)) {
- struct page *page = pfn_to_page(pfn);
- if (!PageReserved(page)) {
- if (pte_dirty(pte))
- set_page_dirty(page);
- page_remove_rmap(page);
- page_cache_release(page);
- dec_mm_counter(mm, rss);
- }
+ if (unlikely(!pfn_valid(pfn))) {
+ print_bad_pte(vma, pte, addr);
+ goto out;
}
+ page = pfn_to_page(pfn);
+ if (pte_dirty(pte))
+ set_page_dirty(page);
+ page_remove_rmap(page);
+ page_cache_release(page);
} else {
if (!pte_file(pte))
free_swap_and_cache(pte_to_swp_entry(pte));
pte_clear(mm, addr, ptep);
}
+out:
+ return !!page;
}
/*
@@ -64,21 +63,20 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
pud_t *pud;
pgd_t *pgd;
pte_t pte_val;
+ spinlock_t *ptl;
+
+ BUG_ON(vma->vm_flags & VM_RESERVED);
pgd = pgd_offset(mm, addr);
- spin_lock(&mm->page_table_lock);
-
pud = pud_alloc(mm, pgd, addr);
if (!pud)
- goto err_unlock;
-
+ goto out;
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
- goto err_unlock;
-
- pte = pte_alloc_map(mm, pmd, addr);
+ goto out;
+ pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
if (!pte)
- goto err_unlock;
+ goto out;
/*
* This page may have been truncated. Tell the
@@ -88,29 +86,27 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
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 err_unlock;
+ goto unlock;
err = -ENOMEM;
if (page_mapcount(page) > INT_MAX/2)
- goto err_unlock;
+ goto unlock;
- zap_pte(mm, vma, addr, pte);
+ if (pte_none(*pte) || !zap_pte(mm, vma, addr, pte))
+ inc_mm_counter(mm, file_rss);
- inc_mm_counter(mm,rss);
flush_icache_page(vma, page);
set_pte_at(mm, addr, pte, mk_pte(page, prot));
page_add_file_rmap(page);
pte_val = *pte;
- pte_unmap(pte);
update_mmu_cache(vma, addr, pte_val);
-
err = 0;
-err_unlock:
- spin_unlock(&mm->page_table_lock);
+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.
@@ -124,37 +120,35 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
pud_t *pud;
pgd_t *pgd;
pte_t pte_val;
+ spinlock_t *ptl;
+
+ BUG_ON(vma->vm_flags & VM_RESERVED);
pgd = pgd_offset(mm, addr);
- spin_lock(&mm->page_table_lock);
-
pud = pud_alloc(mm, pgd, addr);
if (!pud)
- goto err_unlock;
-
+ goto out;
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
- goto err_unlock;
-
- pte = pte_alloc_map(mm, pmd, addr);
+ goto out;
+ pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
if (!pte)
- goto err_unlock;
+ goto out;
- zap_pte(mm, vma, addr, pte);
+ if (!pte_none(*pte) && zap_pte(mm, vma, addr, pte)) {
+ update_hiwater_rss(mm);
+ dec_mm_counter(mm, file_rss);
+ }
set_pte_at(mm, addr, pte, pgoff_to_pte(pgoff));
pte_val = *pte;
- pte_unmap(pte);
update_mmu_cache(vma, addr, pte_val);
- spin_unlock(&mm->page_table_lock);
- return 0;
-
-err_unlock:
- spin_unlock(&mm->page_table_lock);
+ pte_unmap_unlock(pte, ptl);
+ err = 0;
+out:
return err;
}
-
/***
* sys_remap_file_pages - remap arbitrary pages of a shared backing store
* file within an existing vma.