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[PATCH] Page migration: Fix vma flag checking

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Currently we do not check for vma flags if sys_move_pages is called to move
individual pages.  If sys_migrate_pages is called to move pages then we
check for vm_flags that indicate a non migratable vma but that still
includes VM_LOCKED and we can migrate mlocked pages.

Extract the vma_migratable check from mm/mempolicy.c, fix it and put it
into migrate.h so that is can be used from both locations.

Problem was spotted by Lee Schermerhorn

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-03-05 00:30:33 -08:00 committed by Linus Torvalds
parent 1f2b69f9bd
commit 0dc952dc3e
3 changed files with 9 additions and 10 deletions
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8
include/linux/migrate.h
View File

@ -5,6 +5,14 @@
typedef struct page *new_page_t(struct page *, unsigned long private, int **);
/* Check if a vma is migratable */
static inline int vma_migratable(struct vm_area_struct *vma)
{
if (vma->vm_flags & (VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED))
return 0;
return 1;
}
#ifdef CONFIG_MIGRATION
extern int isolate_lru_page(struct page *p, struct list_head *pagelist);
extern int putback_lru_pages(struct list_head *l);

9
mm/mempolicy.c
View File

@ -321,15 +321,6 @@ static inline int check_pgd_range(struct vm_area_struct *vma,
return 0;
}
/* Check if a vma is migratable */
static inline int vma_migratable(struct vm_area_struct *vma)
{
if (vma->vm_flags & (
VM_LOCKED|VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED))
return 0;
return 1;
}
/*
* Check if all pages in a range are on a set of nodes.
* If pagelist != NULL then isolate pages from the LRU and

2
mm/migrate.c
View File

@ -781,7 +781,7 @@ static int do_move_pages(struct mm_struct *mm, struct page_to_node *pm,
err = -EFAULT;
vma = find_vma(mm, pp->addr);
if (!vma)
if (!vma || !vma_migratable(vma))
goto set_status;
page = follow_page(vma, pp->addr, FOLL_GET);