memcg: add inactive_anon_is_low()

[safe/jmp/linux-2.6] / mm / nommu.c

diff --git a/mm/nommu.c b/mm/nommu.c
index ed75bc9..1c28ea3 100644 (file)
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -34,6 +34,8 @@
 #include <asm/tlb.h>
 #include <asm/tlbflush.h>
 
+#include "internal.h"
+
 void *high_memory;
 struct page *mem_map;
 unsigned long max_mapnr;
@@ -84,7 +86,7 @@ do_expand:
        i_size_write(inode, offset);
 
 out_truncate:
-       if (inode->i_op && inode->i_op->truncate)
+       if (inode->i_op->truncate)
                inode->i_op->truncate(inode);
        return 0;
 out_sig:
@@ -128,20 +130,16 @@ unsigned int kobjsize(const void *objp)
        return PAGE_SIZE << compound_order(page);
 }
 
-/*
- * get a list of pages in an address range belonging to the specified process
- * and indicate the VMA that covers each page
- * - this is potentially dodgy as we may end incrementing the page count of a
- *   slab page or a secondary page from a compound page
- * - don't permit access to VMAs that don't support it, such as I/O mappings
- */
-int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
-       unsigned long start, int len, int write, int force,
-       struct page **pages, struct vm_area_struct **vmas)
+int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
+                    unsigned long start, int len, int flags,
+               struct page **pages, struct vm_area_struct **vmas)
 {
        struct vm_area_struct *vma;
        unsigned long vm_flags;
        int i;
+       int write = !!(flags & GUP_FLAGS_WRITE);
+       int force = !!(flags & GUP_FLAGS_FORCE);
+       int ignore = !!(flags & GUP_FLAGS_IGNORE_VMA_PERMISSIONS);
 
        /* calculate required read or write permissions.
         * - if 'force' is set, we only require the "MAY" flags.
@@ -156,7 +154,7 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
 
                /* protect what we can, including chardevs */
                if (vma->vm_flags & (VM_IO | VM_PFNMAP) ||
-                   !(vm_flags & vma->vm_flags))
+                   (!ignore && !(vm_flags & vma->vm_flags)))
                        goto finish_or_fault;
 
                if (pages) {
@@ -174,6 +172,30 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
 finish_or_fault:
        return i ? : -EFAULT;
 }
+
+
+/*
+ * get a list of pages in an address range belonging to the specified process
+ * and indicate the VMA that covers each page
+ * - this is potentially dodgy as we may end incrementing the page count of a
+ *   slab page or a secondary page from a compound page
+ * - don't permit access to VMAs that don't support it, such as I/O mappings
+ */
+int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
+       unsigned long start, int len, int write, int force,
+       struct page **pages, struct vm_area_struct **vmas)
+{
+       int flags = 0;
+
+       if (write)
+               flags |= GUP_FLAGS_WRITE;
+       if (force)
+               flags |= GUP_FLAGS_FORCE;
+
+       return __get_user_pages(tsk, mm,
+                               start, len, flags,
+                               pages, vmas);
+}
 EXPORT_SYMBOL(get_user_pages);
 
 DEFINE_RWLOCK(vmlist_lock);
@@ -1432,7 +1454,8 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
 
        /* Don't let a single process grow too big:
           leave 3% of the size of this process for other processes */
-       allowed -= current->mm->total_vm / 32;
+       if (mm)
+               allowed -= mm->total_vm / 32;
 
        /*
         * cast `allowed' as a signed long because vm_committed_space