oom: fix integer overflow of points in oom_badness
[linux-2.6.git] / mm / nommu.c
index 5d8ae08..4358032 100644 (file)
@@ -6,11 +6,11 @@
  *
  *  See Documentation/nommu-mmap.txt
  *
- *  Copyright (c) 2004-2005 David Howells <dhowells@redhat.com>
+ *  Copyright (c) 2004-2008 David Howells <dhowells@redhat.com>
  *  Copyright (c) 2000-2003 David McCullough <davidm@snapgear.com>
  *  Copyright (c) 2000-2001 D Jeff Dionne <jeff@uClinux.org>
  *  Copyright (c) 2002      Greg Ungerer <gerg@snapgear.com>
- *  Copyright (c) 2007      Paul Mundt <lethal@linux-sh.org>
+ *  Copyright (c) 2007-2010 Paul Mundt <lethal@linux-sh.org>
  */
 
 #include <linux/module.h>
 #include <linux/pagemap.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
-#include <linux/ptrace.h>
 #include <linux/blkdev.h>
 #include <linux/backing-dev.h>
 #include <linux/mount.h>
 #include <linux/personality.h>
 #include <linux/security.h>
 #include <linux/syscalls.h>
+#include <linux/audit.h>
 
 #include <asm/uaccess.h>
 #include <asm/tlb.h>
 #include <asm/tlbflush.h>
+#include <asm/mmu_context.h>
+#include "internal.h"
+
+#if 0
+#define kenter(FMT, ...) \
+       printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
+#define kleave(FMT, ...) \
+       printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
+#define kdebug(FMT, ...) \
+       printk(KERN_DEBUG "xxx" FMT"yyy\n", ##__VA_ARGS__)
+#else
+#define kenter(FMT, ...) \
+       no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
+#define kleave(FMT, ...) \
+       no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
+#define kdebug(FMT, ...) \
+       no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
+#endif
 
 void *high_memory;
 struct page *mem_map;
 unsigned long max_mapnr;
 unsigned long num_physpages;
-unsigned long askedalloc, realalloc;
-atomic_t vm_committed_space = ATOMIC_INIT(0);
+unsigned long highest_memmap_pfn;
+struct percpu_counter vm_committed_as;
 int sysctl_overcommit_memory = OVERCOMMIT_GUESS; /* heuristic overcommit */
 int sysctl_overcommit_ratio = 50; /* default is 50% */
 int sysctl_max_map_count = DEFAULT_MAX_MAP_COUNT;
+int sysctl_nr_trim_pages = CONFIG_NOMMU_INITIAL_TRIM_EXCESS;
 int heap_stack_gap = 0;
 
+atomic_long_t mmap_pages_allocated;
+
 EXPORT_SYMBOL(mem_map);
 EXPORT_SYMBOL(num_physpages);
 
-/* list of shareable VMAs */
-struct rb_root nommu_vma_tree = RB_ROOT;
-DECLARE_RWSEM(nommu_vma_sem);
+/* list of mapped, potentially shareable regions */
+static struct kmem_cache *vm_region_jar;
+struct rb_root nommu_region_tree = RB_ROOT;
+DECLARE_RWSEM(nommu_region_sem);
 
-struct vm_operations_struct generic_file_vm_ops = {
+const struct vm_operations_struct generic_file_vm_ops = {
 };
 
 /*
- * Handle all mappings that got truncated by a "truncate()"
- * system call.
- *
- * NOTE! We have to be ready to update the memory sharing
- * between the file and the memory map for a potential last
- * incomplete page.  Ugly, but necessary.
- */
-int vmtruncate(struct inode *inode, loff_t offset)
-{
-       struct address_space *mapping = inode->i_mapping;
-       unsigned long limit;
-
-       if (inode->i_size < offset)
-               goto do_expand;
-       i_size_write(inode, offset);
-
-       truncate_inode_pages(mapping, offset);
-       goto out_truncate;
-
-do_expand:
-       limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
-       if (limit != RLIM_INFINITY && offset > limit)
-               goto out_sig;
-       if (offset > inode->i_sb->s_maxbytes)
-               goto out;
-       i_size_write(inode, offset);
-
-out_truncate:
-       if (inode->i_op && inode->i_op->truncate)
-               inode->i_op->truncate(inode);
-       return 0;
-out_sig:
-       send_sig(SIGXFSZ, current, 0);
-out:
-       return -EFBIG;
-}
-
-EXPORT_SYMBOL(vmtruncate);
-
-/*
  * Return the total memory allocated for this pointer, not
  * just what the caller asked for.
  *
@@ -105,46 +87,67 @@ unsigned int kobjsize(const void *objp)
 {
        struct page *page;
 
-       if (!objp || !((page = virt_to_page(objp))))
+       /*
+        * If the object we have should not have ksize performed on it,
+        * return size of 0
+        */
+       if (!objp || !virt_addr_valid(objp))
                return 0;
 
+       page = virt_to_head_page(objp);
+
+       /*
+        * If the allocator sets PageSlab, we know the pointer came from
+        * kmalloc().
+        */
        if (PageSlab(page))
                return ksize(objp);
 
-       BUG_ON(page->index < 0);
-       BUG_ON(page->index >= MAX_ORDER);
+       /*
+        * If it's not a compound page, see if we have a matching VMA
+        * region. This test is intentionally done in reverse order,
+        * so if there's no VMA, we still fall through and hand back
+        * PAGE_SIZE for 0-order pages.
+        */
+       if (!PageCompound(page)) {
+               struct vm_area_struct *vma;
 
-       return (PAGE_SIZE << page->index);
+               vma = find_vma(current->mm, (unsigned long)objp);
+               if (vma)
+                       return vma->vm_end - vma->vm_start;
+       }
+
+       /*
+        * The ksize() function is only guaranteed to work for pointers
+        * returned by kmalloc(). So handle arbitrary pointers here.
+        */
+       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 nr_pages, unsigned int foll_flags,
+                    struct page **pages, struct vm_area_struct **vmas,
+                    int *retry)
 {
        struct vm_area_struct *vma;
        unsigned long vm_flags;
        int i;
 
        /* calculate required read or write permissions.
-        * - if 'force' is set, we only require the "MAY" flags.
+        * If FOLL_FORCE is set, we only require the "MAY" flags.
         */
-       vm_flags  = write ? (VM_WRITE | VM_MAYWRITE) : (VM_READ | VM_MAYREAD);
-       vm_flags &= force ? (VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE);
+       vm_flags  = (foll_flags & FOLL_WRITE) ?
+                       (VM_WRITE | VM_MAYWRITE) : (VM_READ | VM_MAYREAD);
+       vm_flags &= (foll_flags & FOLL_FORCE) ?
+                       (VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE);
 
-       for (i = 0; i < len; i++) {
+       for (i = 0; i < nr_pages; i++) {
                vma = find_vma(mm, start);
                if (!vma)
                        goto finish_or_fault;
 
                /* protect what we can, including chardevs */
-               if (vma->vm_flags & (VM_IO | VM_PFNMAP) ||
+               if ((vma->vm_flags & (VM_IO | VM_PFNMAP)) ||
                    !(vm_flags & vma->vm_flags))
                        goto finish_or_fault;
 
@@ -155,7 +158,7 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
                }
                if (vmas)
                        vmas[i] = vma;
-               start += PAGE_SIZE;
+               start = (start + PAGE_SIZE) & PAGE_MASK;
        }
 
        return i;
@@ -163,8 +166,51 @@ 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 nr_pages, int write, int force,
+       struct page **pages, struct vm_area_struct **vmas)
+{
+       int flags = 0;
+
+       if (write)
+               flags |= FOLL_WRITE;
+       if (force)
+               flags |= FOLL_FORCE;
+
+       return __get_user_pages(tsk, mm, start, nr_pages, flags, pages, vmas,
+                               NULL);
+}
 EXPORT_SYMBOL(get_user_pages);
 
+/**
+ * follow_pfn - look up PFN at a user virtual address
+ * @vma: memory mapping
+ * @address: user virtual address
+ * @pfn: location to store found PFN
+ *
+ * Only IO mappings and raw PFN mappings are allowed.
+ *
+ * Returns zero and the pfn at @pfn on success, -ve otherwise.
+ */
+int follow_pfn(struct vm_area_struct *vma, unsigned long address,
+       unsigned long *pfn)
+{
+       if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)))
+               return -EINVAL;
+
+       *pfn = address >> PAGE_SHIFT;
+       return 0;
+}
+EXPORT_SYMBOL(follow_pfn);
+
 DEFINE_RWLOCK(vmlist_lock);
 struct vm_struct *vmlist;
 
@@ -249,6 +295,36 @@ void *vmalloc(unsigned long size)
 }
 EXPORT_SYMBOL(vmalloc);
 
+/*
+ *     vzalloc - allocate virtually continguos memory with zero fill
+ *
+ *     @size:          allocation size
+ *
+ *     Allocate enough pages to cover @size from the page level
+ *     allocator and map them into continguos kernel virtual space.
+ *     The memory allocated is set to zero.
+ *
+ *     For tight control over page level allocator and protection flags
+ *     use __vmalloc() instead.
+ */
+void *vzalloc(unsigned long size)
+{
+       return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO,
+                       PAGE_KERNEL);
+}
+EXPORT_SYMBOL(vzalloc);
+
+/**
+ * vmalloc_node - allocate memory on a specific node
+ * @size:      allocation size
+ * @node:      numa node
+ *
+ * Allocate enough pages to cover @size from the page level
+ * allocator and map them into contiguous kernel virtual space.
+ *
+ * For tight control over page level allocator and protection flags
+ * use __vmalloc() instead.
+ */
 void *vmalloc_node(unsigned long size, int node)
 {
        return vmalloc(size);
@@ -256,6 +332,45 @@ void *vmalloc_node(unsigned long size, int node)
 EXPORT_SYMBOL(vmalloc_node);
 
 /**
+ * vzalloc_node - allocate memory on a specific node with zero fill
+ * @size:      allocation size
+ * @node:      numa node
+ *
+ * Allocate enough pages to cover @size from the page level
+ * allocator and map them into contiguous kernel virtual space.
+ * The memory allocated is set to zero.
+ *
+ * For tight control over page level allocator and protection flags
+ * use __vmalloc() instead.
+ */
+void *vzalloc_node(unsigned long size, int node)
+{
+       return vzalloc(size);
+}
+EXPORT_SYMBOL(vzalloc_node);
+
+#ifndef PAGE_KERNEL_EXEC
+# define PAGE_KERNEL_EXEC PAGE_KERNEL
+#endif
+
+/**
+ *     vmalloc_exec  -  allocate virtually contiguous, executable memory
+ *     @size:          allocation size
+ *
+ *     Kernel-internal function to allocate enough pages to cover @size
+ *     the page level allocator and map them into contiguous and
+ *     executable kernel virtual space.
+ *
+ *     For tight control over page level allocator and protection flags
+ *     use __vmalloc() instead.
+ */
+
+void *vmalloc_exec(unsigned long size)
+{
+       return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC);
+}
+
+/**
  * vmalloc_32  -  allocate virtually contiguous memory (32bit addressable)
  *     @size:          allocation size
  *
@@ -301,6 +416,24 @@ void vunmap(const void *addr)
 }
 EXPORT_SYMBOL(vunmap);
 
+void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot)
+{
+       BUG();
+       return NULL;
+}
+EXPORT_SYMBOL(vm_map_ram);
+
+void vm_unmap_ram(const void *mem, unsigned int count)
+{
+       BUG();
+}
+EXPORT_SYMBOL(vm_unmap_ram);
+
+void vm_unmap_aliases(void)
+{
+}
+EXPORT_SYMBOL_GPL(vm_unmap_aliases);
+
 /*
  * Implement a stub for vmalloc_sync_all() if the architecture chose not to
  * have one.
@@ -309,6 +442,31 @@ void  __attribute__((weak)) vmalloc_sync_all(void)
 {
 }
 
+/**
+ *     alloc_vm_area - allocate a range of kernel address space
+ *     @size:          size of the area
+ *
+ *     Returns:        NULL on failure, vm_struct on success
+ *
+ *     This function reserves a range of kernel address space, and
+ *     allocates pagetables to map that range.  No actual mappings
+ *     are created.  If the kernel address space is not shared
+ *     between processes, it syncs the pagetable across all
+ *     processes.
+ */
+struct vm_struct *alloc_vm_area(size_t size)
+{
+       BUG();
+       return NULL;
+}
+EXPORT_SYMBOL_GPL(alloc_vm_area);
+
+void free_vm_area(struct vm_struct *area)
+{
+       BUG();
+}
+EXPORT_SYMBOL_GPL(free_vm_area);
+
 int vm_insert_page(struct vm_area_struct *vma, unsigned long addr,
                   struct page *page)
 {
@@ -323,7 +481,7 @@ EXPORT_SYMBOL(vm_insert_page);
  *  to a regular file.  in this case, the unmapping will need
  *  to invoke file system routines that need the global lock.
  */
-asmlinkage unsigned long sys_brk(unsigned long brk)
+SYSCALL_DEFINE1(brk, unsigned long, brk)
 {
        struct mm_struct *mm = current->mm;
 
@@ -344,132 +502,195 @@ asmlinkage unsigned long sys_brk(unsigned long brk)
        /*
         * Ok, looks good - let it rip.
         */
+       flush_icache_range(mm->brk, brk);
        return mm->brk = brk;
 }
 
-#ifdef DEBUG
-static void show_process_blocks(void)
+/*
+ * initialise the VMA and region record slabs
+ */
+void __init mmap_init(void)
 {
-       struct vm_list_struct *vml;
-
-       printk("Process blocks %d:", current->pid);
+       int ret;
 
-       for (vml = &current->mm->context.vmlist; vml; vml = vml->next) {
-               printk(" %p: %p", vml, vml->vma);
-               if (vml->vma)
-                       printk(" (%d @%lx #%d)",
-                              kobjsize((void *) vml->vma->vm_start),
-                              vml->vma->vm_start,
-                              atomic_read(&vml->vma->vm_usage));
-               printk(vml->next ? " ->" : ".\n");
-       }
+       ret = percpu_counter_init(&vm_committed_as, 0);
+       VM_BUG_ON(ret);
+       vm_region_jar = KMEM_CACHE(vm_region, SLAB_PANIC);
 }
-#endif /* DEBUG */
 
 /*
- * add a VMA into a process's mm_struct in the appropriate place in the list
- * - should be called with mm->mmap_sem held writelocked
+ * validate the region tree
+ * - the caller must hold the region lock
  */
-static void add_vma_to_mm(struct mm_struct *mm, struct vm_list_struct *vml)
+#ifdef CONFIG_DEBUG_NOMMU_REGIONS
+static noinline void validate_nommu_regions(void)
 {
-       struct vm_list_struct **ppv;
+       struct vm_region *region, *last;
+       struct rb_node *p, *lastp;
 
-       for (ppv = &current->mm->context.vmlist; *ppv; ppv = &(*ppv)->next)
-               if ((*ppv)->vma->vm_start > vml->vma->vm_start)
-                       break;
+       lastp = rb_first(&nommu_region_tree);
+       if (!lastp)
+               return;
 
-       vml->next = *ppv;
-       *ppv = vml;
+       last = rb_entry(lastp, struct vm_region, vm_rb);
+       BUG_ON(unlikely(last->vm_end <= last->vm_start));
+       BUG_ON(unlikely(last->vm_top < last->vm_end));
+
+       while ((p = rb_next(lastp))) {
+               region = rb_entry(p, struct vm_region, vm_rb);
+               last = rb_entry(lastp, struct vm_region, vm_rb);
+
+               BUG_ON(unlikely(region->vm_end <= region->vm_start));
+               BUG_ON(unlikely(region->vm_top < region->vm_end));
+               BUG_ON(unlikely(region->vm_start < last->vm_top));
+
+               lastp = p;
+       }
 }
+#else
+static void validate_nommu_regions(void)
+{
+}
+#endif
 
 /*
- * look up the first VMA in which addr resides, NULL if none
- * - should be called with mm->mmap_sem at least held readlocked
+ * add a region into the global tree
  */
-struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
+static void add_nommu_region(struct vm_region *region)
 {
-       struct vm_list_struct *loop, *vml;
+       struct vm_region *pregion;
+       struct rb_node **p, *parent;
 
-       /* search the vm_start ordered list */
-       vml = NULL;
-       for (loop = mm->context.vmlist; loop; loop = loop->next) {
-               if (loop->vma->vm_start > addr)
-                       break;
-               vml = loop;
+       validate_nommu_regions();
+
+       parent = NULL;
+       p = &nommu_region_tree.rb_node;
+       while (*p) {
+               parent = *p;
+               pregion = rb_entry(parent, struct vm_region, vm_rb);
+               if (region->vm_start < pregion->vm_start)
+                       p = &(*p)->rb_left;
+               else if (region->vm_start > pregion->vm_start)
+                       p = &(*p)->rb_right;
+               else if (pregion == region)
+                       return;
+               else
+                       BUG();
        }
 
-       if (vml && vml->vma->vm_end > addr)
-               return vml->vma;
+       rb_link_node(&region->vm_rb, parent, p);
+       rb_insert_color(&region->vm_rb, &nommu_region_tree);
 
-       return NULL;
+       validate_nommu_regions();
 }
-EXPORT_SYMBOL(find_vma);
 
 /*
- * find a VMA
- * - we don't extend stack VMAs under NOMMU conditions
+ * delete a region from the global tree
  */
-struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr)
+static void delete_nommu_region(struct vm_region *region)
 {
-       return find_vma(mm, addr);
+       BUG_ON(!nommu_region_tree.rb_node);
+
+       validate_nommu_regions();
+       rb_erase(&region->vm_rb, &nommu_region_tree);
+       validate_nommu_regions();
 }
 
-int expand_stack(struct vm_area_struct *vma, unsigned long address)
+/*
+ * free a contiguous series of pages
+ */
+static void free_page_series(unsigned long from, unsigned long to)
 {
-       return -ENOMEM;
+       for (; from < to; from += PAGE_SIZE) {
+               struct page *page = virt_to_page(from);
+
+               kdebug("- free %lx", from);
+               atomic_long_dec(&mmap_pages_allocated);
+               if (page_count(page) != 1)
+                       kdebug("free page %p: refcount not one: %d",
+                              page, page_count(page));
+               put_page(page);
+       }
 }
 
 /*
- * look up the first VMA exactly that exactly matches addr
- * - should be called with mm->mmap_sem at least held readlocked
+ * release a reference to a region
+ * - the caller must hold the region semaphore for writing, which this releases
+ * - the region may not have been added to the tree yet, in which case vm_top
+ *   will equal vm_start
  */
-static inline struct vm_area_struct *find_vma_exact(struct mm_struct *mm,
-                                                   unsigned long addr)
+static void __put_nommu_region(struct vm_region *region)
+       __releases(nommu_region_sem)
 {
-       struct vm_list_struct *vml;
+       kenter("%p{%d}", region, region->vm_usage);
 
-       /* search the vm_start ordered list */
-       for (vml = mm->context.vmlist; vml; vml = vml->next) {
-               if (vml->vma->vm_start == addr)
-                       return vml->vma;
-               if (vml->vma->vm_start > addr)
-                       break;
-       }
+       BUG_ON(!nommu_region_tree.rb_node);
 
-       return NULL;
+       if (--region->vm_usage == 0) {
+               if (region->vm_top > region->vm_start)
+                       delete_nommu_region(region);
+               up_write(&nommu_region_sem);
+
+               if (region->vm_file)
+                       fput(region->vm_file);
+
+               /* IO memory and memory shared directly out of the pagecache
+                * from ramfs/tmpfs mustn't be released here */
+               if (region->vm_flags & VM_MAPPED_COPY) {
+                       kdebug("free series");
+                       free_page_series(region->vm_start, region->vm_top);
+               }
+               kmem_cache_free(vm_region_jar, region);
+       } else {
+               up_write(&nommu_region_sem);
+       }
 }
 
 /*
- * find a VMA in the global tree
+ * release a reference to a region
  */
-static inline struct vm_area_struct *find_nommu_vma(unsigned long start)
+static void put_nommu_region(struct vm_region *region)
 {
-       struct vm_area_struct *vma;
-       struct rb_node *n = nommu_vma_tree.rb_node;
-
-       while (n) {
-               vma = rb_entry(n, struct vm_area_struct, vm_rb);
+       down_write(&nommu_region_sem);
+       __put_nommu_region(region);
+}
 
-               if (start < vma->vm_start)
-                       n = n->rb_left;
-               else if (start > vma->vm_start)
-                       n = n->rb_right;
-               else
-                       return vma;
+/*
+ * update protection on a vma
+ */
+static void protect_vma(struct vm_area_struct *vma, unsigned long flags)
+{
+#ifdef CONFIG_MPU
+       struct mm_struct *mm = vma->vm_mm;
+       long start = vma->vm_start & PAGE_MASK;
+       while (start < vma->vm_end) {
+               protect_page(mm, start, flags);
+               start += PAGE_SIZE;
        }
-
-       return NULL;
+       update_protections(mm);
+#endif
 }
 
 /*
- * add a VMA in the global tree
+ * add a VMA into a process's mm_struct in the appropriate place in the list
+ * and tree and add to the address space's page tree also if not an anonymous
+ * page
+ * - should be called with mm->mmap_sem held writelocked
  */
-static void add_nommu_vma(struct vm_area_struct *vma)
+static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
 {
-       struct vm_area_struct *pvma;
+       struct vm_area_struct *pvma, *prev;
        struct address_space *mapping;
-       struct rb_node **p = &nommu_vma_tree.rb_node;
-       struct rb_node *parent = NULL;
+       struct rb_node **p, *parent, *rb_prev;
+
+       kenter(",%p", vma);
+
+       BUG_ON(!vma->vm_region);
+
+       mm->map_count++;
+       vma->vm_mm = mm;
+
+       protect_vma(vma, vma->vm_flags);
 
        /* add the VMA to the mapping */
        if (vma->vm_file) {
@@ -480,42 +701,60 @@ static void add_nommu_vma(struct vm_area_struct *vma)
                flush_dcache_mmap_unlock(mapping);
        }
 
-       /* add the VMA to the master list */
+       /* add the VMA to the tree */
+       parent = rb_prev = NULL;
+       p = &mm->mm_rb.rb_node;
        while (*p) {
                parent = *p;
                pvma = rb_entry(parent, struct vm_area_struct, vm_rb);
 
-               if (vma->vm_start < pvma->vm_start) {
+               /* sort by: start addr, end addr, VMA struct addr in that order
+                * (the latter is necessary as we may get identical VMAs) */
+               if (vma->vm_start < pvma->vm_start)
                        p = &(*p)->rb_left;
-               }
                else if (vma->vm_start > pvma->vm_start) {
+                       rb_prev = parent;
                        p = &(*p)->rb_right;
-               }
-               else {
-                       /* mappings are at the same address - this can only
-                        * happen for shared-mem chardevs and shared file
-                        * mappings backed by ramfs/tmpfs */
-                       BUG_ON(!(pvma->vm_flags & VM_SHARED));
-
-                       if (vma < pvma)
-                               p = &(*p)->rb_left;
-                       else if (vma > pvma)
-                               p = &(*p)->rb_right;
-                       else
-                               BUG();
-               }
+               } else if (vma->vm_end < pvma->vm_end)
+                       p = &(*p)->rb_left;
+               else if (vma->vm_end > pvma->vm_end) {
+                       rb_prev = parent;
+                       p = &(*p)->rb_right;
+               } else if (vma < pvma)
+                       p = &(*p)->rb_left;
+               else if (vma > pvma) {
+                       rb_prev = parent;
+                       p = &(*p)->rb_right;
+               } else
+                       BUG();
        }
 
        rb_link_node(&vma->vm_rb, parent, p);
-       rb_insert_color(&vma->vm_rb, &nommu_vma_tree);
+       rb_insert_color(&vma->vm_rb, &mm->mm_rb);
+
+       /* add VMA to the VMA list also */
+       prev = NULL;
+       if (rb_prev)
+               prev = rb_entry(rb_prev, struct vm_area_struct, vm_rb);
+
+       __vma_link_list(mm, vma, prev, parent);
 }
 
 /*
- * delete a VMA from the global list
+ * delete a VMA from its owning mm_struct and address space
  */
-static void delete_nommu_vma(struct vm_area_struct *vma)
+static void delete_vma_from_mm(struct vm_area_struct *vma)
 {
        struct address_space *mapping;
+       struct mm_struct *mm = vma->vm_mm;
+
+       kenter("%p", vma);
+
+       protect_vma(vma, 0);
+
+       mm->map_count--;
+       if (mm->mmap_cache == vma)
+               mm->mmap_cache = NULL;
 
        /* remove the VMA from the mapping */
        if (vma->vm_file) {
@@ -526,8 +765,113 @@ static void delete_nommu_vma(struct vm_area_struct *vma)
                flush_dcache_mmap_unlock(mapping);
        }
 
-       /* remove from the master list */
-       rb_erase(&vma->vm_rb, &nommu_vma_tree);
+       /* remove from the MM's tree and list */
+       rb_erase(&vma->vm_rb, &mm->mm_rb);
+
+       if (vma->vm_prev)
+               vma->vm_prev->vm_next = vma->vm_next;
+       else
+               mm->mmap = vma->vm_next;
+
+       if (vma->vm_next)
+               vma->vm_next->vm_prev = vma->vm_prev;
+
+       vma->vm_mm = NULL;
+}
+
+/*
+ * destroy a VMA record
+ */
+static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma)
+{
+       kenter("%p", vma);
+       if (vma->vm_ops && vma->vm_ops->close)
+               vma->vm_ops->close(vma);
+       if (vma->vm_file) {
+               fput(vma->vm_file);
+               if (vma->vm_flags & VM_EXECUTABLE)
+                       removed_exe_file_vma(mm);
+       }
+       put_nommu_region(vma->vm_region);
+       kmem_cache_free(vm_area_cachep, vma);
+}
+
+/*
+ * look up the first VMA in which addr resides, NULL if none
+ * - should be called with mm->mmap_sem at least held readlocked
+ */
+struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
+{
+       struct vm_area_struct *vma;
+
+       /* check the cache first */
+       vma = mm->mmap_cache;
+       if (vma && vma->vm_start <= addr && vma->vm_end > addr)
+               return vma;
+
+       /* trawl the list (there may be multiple mappings in which addr
+        * resides) */
+       for (vma = mm->mmap; vma; vma = vma->vm_next) {
+               if (vma->vm_start > addr)
+                       return NULL;
+               if (vma->vm_end > addr) {
+                       mm->mmap_cache = vma;
+                       return vma;
+               }
+       }
+
+       return NULL;
+}
+EXPORT_SYMBOL(find_vma);
+
+/*
+ * find a VMA
+ * - we don't extend stack VMAs under NOMMU conditions
+ */
+struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr)
+{
+       return find_vma(mm, addr);
+}
+
+/*
+ * expand a stack to a given address
+ * - not supported under NOMMU conditions
+ */
+int expand_stack(struct vm_area_struct *vma, unsigned long address)
+{
+       return -ENOMEM;
+}
+
+/*
+ * look up the first VMA exactly that exactly matches addr
+ * - should be called with mm->mmap_sem at least held readlocked
+ */
+static struct vm_area_struct *find_vma_exact(struct mm_struct *mm,
+                                            unsigned long addr,
+                                            unsigned long len)
+{
+       struct vm_area_struct *vma;
+       unsigned long end = addr + len;
+
+       /* check the cache first */
+       vma = mm->mmap_cache;
+       if (vma && vma->vm_start == addr && vma->vm_end == end)
+               return vma;
+
+       /* trawl the list (there may be multiple mappings in which addr
+        * resides) */
+       for (vma = mm->mmap; vma; vma = vma->vm_next) {
+               if (vma->vm_start < addr)
+                       continue;
+               if (vma->vm_start > addr)
+                       return NULL;
+               if (vma->vm_end == end) {
+                       mm->mmap_cache = vma;
+                       return vma;
+               }
+       }
+
+       return NULL;
 }
 
 /*
@@ -542,12 +886,12 @@ static int validate_mmap_request(struct file *file,
                                 unsigned long pgoff,
                                 unsigned long *_capabilities)
 {
-       unsigned long capabilities;
+       unsigned long capabilities, rlen;
        unsigned long reqprot = prot;
        int ret;
 
        /* do the simple checks first */
-       if (flags & MAP_FIXED || addr) {
+       if (flags & MAP_FIXED) {
                printk(KERN_DEBUG
                       "%d: Can't do fixed-address/overlay mmap of RAM\n",
                       current->pid);
@@ -562,12 +906,12 @@ static int validate_mmap_request(struct file *file,
                return -EINVAL;
 
        /* Careful about overflows.. */
-       len = PAGE_ALIGN(len);
-       if (!len || len > TASK_SIZE)
+       rlen = PAGE_ALIGN(len);
+       if (!rlen || rlen > TASK_SIZE)
                return -ENOMEM;
 
        /* offset overflow? */
-       if ((pgoff + (len >> PAGE_SHIFT)) < pgoff)
+       if ((pgoff + (rlen >> PAGE_SHIFT)) < pgoff)
                return -EOVERFLOW;
 
        if (file) {
@@ -618,6 +962,10 @@ static int validate_mmap_request(struct file *file,
                if (!file->f_op->read)
                        capabilities &= ~BDI_CAP_MAP_COPY;
 
+               /* The file shall have been opened with read permission. */
+               if (!(file->f_mode & FMODE_READ))
+                       return -EACCES;
+
                if (flags & MAP_SHARED) {
                        /* do checks for writing, appending and locking */
                        if ((prot & PROT_WRITE) &&
@@ -634,14 +982,6 @@ static int validate_mmap_request(struct file *file,
                        if (!(capabilities & BDI_CAP_MAP_DIRECT))
                                return -ENODEV;
 
-                       if (((prot & PROT_READ)  && !(capabilities & BDI_CAP_READ_MAP))  ||
-                           ((prot & PROT_WRITE) && !(capabilities & BDI_CAP_WRITE_MAP)) ||
-                           ((prot & PROT_EXEC)  && !(capabilities & BDI_CAP_EXEC_MAP))
-                           ) {
-                               printk("MAP_SHARED not completely supported on !MMU\n");
-                               return -EINVAL;
-                       }
-
                        /* we mustn't privatise shared mappings */
                        capabilities &= ~BDI_CAP_MAP_COPY;
                }
@@ -657,6 +997,20 @@ static int validate_mmap_request(struct file *file,
                                capabilities &= ~BDI_CAP_MAP_DIRECT;
                }
 
+               if (capabilities & BDI_CAP_MAP_DIRECT) {
+                       if (((prot & PROT_READ)  && !(capabilities & BDI_CAP_READ_MAP))  ||
+                           ((prot & PROT_WRITE) && !(capabilities & BDI_CAP_WRITE_MAP)) ||
+                           ((prot & PROT_EXEC)  && !(capabilities & BDI_CAP_EXEC_MAP))
+                           ) {
+                               capabilities &= ~BDI_CAP_MAP_DIRECT;
+                               if (flags & MAP_SHARED) {
+                                       printk(KERN_WARNING
+                                              "MAP_SHARED not completely supported on !MMU\n");
+                                       return -EINVAL;
+                               }
+                       }
+               }
+
                /* handle executable mappings and implied executable
                 * mappings */
                if (file->f_path.mnt->mnt_flags & MNT_NOEXEC) {
@@ -712,94 +1066,129 @@ static unsigned long determine_vm_flags(struct file *file,
        unsigned long vm_flags;
 
        vm_flags = calc_vm_prot_bits(prot) | calc_vm_flag_bits(flags);
-       vm_flags |= VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
        /* vm_flags |= mm->def_flags; */
 
        if (!(capabilities & BDI_CAP_MAP_DIRECT)) {
                /* attempt to share read-only copies of mapped file chunks */
+               vm_flags |= VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
                if (file && !(prot & PROT_WRITE))
                        vm_flags |= VM_MAYSHARE;
-       }
-       else {
+       } else {
                /* overlay a shareable mapping on the backing device or inode
                 * if possible - used for chardevs, ramfs/tmpfs/shmfs and
                 * romfs/cramfs */
+               vm_flags |= VM_MAYSHARE | (capabilities & BDI_CAP_VMFLAGS);
                if (flags & MAP_SHARED)
-                       vm_flags |= VM_MAYSHARE | VM_SHARED;
-               else if ((((vm_flags & capabilities) ^ vm_flags) & BDI_CAP_VMFLAGS) == 0)
-                       vm_flags |= VM_MAYSHARE;
+                       vm_flags |= VM_SHARED;
        }
 
        /* refuse to let anyone share private mappings with this process if
         * it's being traced - otherwise breakpoints set in it may interfere
         * with another untraced process
         */
-       if ((flags & MAP_PRIVATE) && (current->ptrace & PT_PTRACED))
+       if ((flags & MAP_PRIVATE) && current->ptrace)
                vm_flags &= ~VM_MAYSHARE;
 
        return vm_flags;
 }
 
 /*
- * set up a shared mapping on a file
+ * set up a shared mapping on a file (the driver or filesystem provides and
+ * pins the storage)
  */
-static int do_mmap_shared_file(struct vm_area_struct *vma, unsigned long len)
+static int do_mmap_shared_file(struct vm_area_struct *vma)
 {
        int ret;
 
        ret = vma->vm_file->f_op->mmap(vma->vm_file, vma);
+       if (ret == 0) {
+               vma->vm_region->vm_top = vma->vm_region->vm_end;
+               return 0;
+       }
        if (ret != -ENOSYS)
                return ret;
 
-       /* getting an ENOSYS error indicates that direct mmap isn't
-        * possible (as opposed to tried but failed) so we'll fall
-        * through to making a private copy of the data and mapping
-        * that if we can */
+       /* getting -ENOSYS indicates that direct mmap isn't possible (as
+        * opposed to tried but failed) so we can only give a suitable error as
+        * it's not possible to make a private copy if MAP_SHARED was given */
        return -ENODEV;
 }
 
 /*
  * set up a private mapping or an anonymous shared mapping
  */
-static int do_mmap_private(struct vm_area_struct *vma, unsigned long len)
+static int do_mmap_private(struct vm_area_struct *vma,
+                          struct vm_region *region,
+                          unsigned long len,
+                          unsigned long capabilities)
 {
+       struct page *pages;
+       unsigned long total, point, n;
        void *base;
-       int ret;
+       int ret, order;
 
        /* invoke the file's mapping function so that it can keep track of
         * shared mappings on devices or memory
         * - VM_MAYSHARE will be set if it may attempt to share
         */
-       if (vma->vm_file) {
+       if (capabilities & BDI_CAP_MAP_DIRECT) {
                ret = vma->vm_file->f_op->mmap(vma->vm_file, vma);
-               if (ret != -ENOSYS) {
+               if (ret == 0) {
                        /* shouldn't return success if we're not sharing */
-                       BUG_ON(ret == 0 && !(vma->vm_flags & VM_MAYSHARE));
-                       return ret; /* success or a real error */
+                       BUG_ON(!(vma->vm_flags & VM_MAYSHARE));
+                       vma->vm_region->vm_top = vma->vm_region->vm_end;
+                       return 0;
                }
+               if (ret != -ENOSYS)
+                       return ret;
 
                /* getting an ENOSYS error indicates that direct mmap isn't
                 * possible (as opposed to tried but failed) so we'll try to
                 * make a private copy of the data and map that instead */
        }
 
+
        /* allocate some memory to hold the mapping
         * - note that this may not return a page-aligned address if the object
         *   we're allocating is smaller than a page
         */
-       base = kmalloc(len, GFP_KERNEL|__GFP_COMP);
-       if (!base)
+       order = get_order(len);
+       kdebug("alloc order %d for %lx", order, len);
+
+       pages = alloc_pages(GFP_KERNEL, order);
+       if (!pages)
                goto enomem;
 
-       vma->vm_start = (unsigned long) base;
-       vma->vm_end = vma->vm_start + len;
-       vma->vm_flags |= VM_MAPPED_COPY;
+       total = 1 << order;
+       atomic_long_add(total, &mmap_pages_allocated);
+
+       point = len >> PAGE_SHIFT;
+
+       /* we allocated a power-of-2 sized page set, so we may want to trim off
+        * the excess */
+       if (sysctl_nr_trim_pages && total - point >= sysctl_nr_trim_pages) {
+               while (total > point) {
+                       order = ilog2(total - point);
+                       n = 1 << order;
+                       kdebug("shave %lu/%lu @%lu", n, total - point, total);
+                       atomic_long_sub(n, &mmap_pages_allocated);
+                       total -= n;
+                       set_page_refcounted(pages + total);
+                       __free_pages(pages + total, order);
+               }
+       }
+
+       for (point = 1; point < total; point++)
+               set_page_refcounted(&pages[point]);
 
-#ifdef WARN_ON_SLACK
-       if (len + WARN_ON_SLACK <= kobjsize(result))
-               printk("Allocation of %lu bytes from process %d has %lu bytes of slack\n",
-                      len, current->pid, kobjsize(result) - len);
-#endif
+       base = page_address(pages);
+       region->vm_flags = vma->vm_flags |= VM_MAPPED_COPY;
+       region->vm_start = (unsigned long) base;
+       region->vm_end   = region->vm_start + len;
+       region->vm_top   = region->vm_start + (total << PAGE_SHIFT);
+
+       vma->vm_start = region->vm_start;
+       vma->vm_end   = region->vm_start + len;
 
        if (vma->vm_file) {
                /* read the contents of a file into the copy */
@@ -821,22 +1210,21 @@ static int do_mmap_private(struct vm_area_struct *vma, unsigned long len)
                if (ret < len)
                        memset(base + ret, 0, len - ret);
 
-       } else {
-               /* if it's an anonymous mapping, then just clear it */
-               memset(base, 0, len);
        }
 
        return 0;
 
 error_free:
-       kfree(base);
-       vma->vm_start = 0;
+       free_page_series(region->vm_start, region->vm_top);
+       region->vm_start = vma->vm_start = 0;
+       region->vm_end   = vma->vm_end = 0;
+       region->vm_top   = 0;
        return ret;
 
 enomem:
-       printk("Allocation of length %lu from process %d failed\n",
-              len, current->pid);
-       show_free_areas();
+       printk("Allocation of length %lu from process %d (%s) failed\n",
+              len, current->pid, current->comm);
+       show_free_areas(0);
        return -ENOMEM;
 }
 
@@ -850,284 +1238,476 @@ unsigned long do_mmap_pgoff(struct file *file,
                            unsigned long flags,
                            unsigned long pgoff)
 {
-       struct vm_list_struct *vml = NULL;
-       struct vm_area_struct *vma = NULL;
+       struct vm_area_struct *vma;
+       struct vm_region *region;
        struct rb_node *rb;
-       unsigned long capabilities, vm_flags;
-       void *result;
+       unsigned long capabilities, vm_flags, result;
        int ret;
 
-       if (!(flags & MAP_FIXED))
-               addr = round_hint_to_min(addr);
+       kenter(",%lx,%lx,%lx,%lx,%lx", addr, len, prot, flags, pgoff);
 
        /* decide whether we should attempt the mapping, and if so what sort of
         * mapping */
        ret = validate_mmap_request(file, addr, len, prot, flags, pgoff,
                                    &capabilities);
-       if (ret < 0)
+       if (ret < 0) {
+               kleave(" = %d [val]", ret);
                return ret;
+       }
+
+       /* we ignore the address hint */
+       addr = 0;
+       len = PAGE_ALIGN(len);
 
        /* we've determined that we can make the mapping, now translate what we
         * now know into VMA flags */
        vm_flags = determine_vm_flags(file, prot, flags, capabilities);
 
-       /* we're going to need to record the mapping if it works */
-       vml = kzalloc(sizeof(struct vm_list_struct), GFP_KERNEL);
-       if (!vml)
-               goto error_getting_vml;
+       /* we're going to need to record the mapping */
+       region = kmem_cache_zalloc(vm_region_jar, GFP_KERNEL);
+       if (!region)
+               goto error_getting_region;
+
+       vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
+       if (!vma)
+               goto error_getting_vma;
 
-       down_write(&nommu_vma_sem);
+       region->vm_usage = 1;
+       region->vm_flags = vm_flags;
+       region->vm_pgoff = pgoff;
 
-       /* if we want to share, we need to check for VMAs created by other
+       INIT_LIST_HEAD(&vma->anon_vma_chain);
+       vma->vm_flags = vm_flags;
+       vma->vm_pgoff = pgoff;
+
+       if (file) {
+               region->vm_file = file;
+               get_file(file);
+               vma->vm_file = file;
+               get_file(file);
+               if (vm_flags & VM_EXECUTABLE) {
+                       added_exe_file_vma(current->mm);
+                       vma->vm_mm = current->mm;
+               }
+       }
+
+       down_write(&nommu_region_sem);
+
+       /* if we want to share, we need to check for regions created by other
         * mmap() calls that overlap with our proposed mapping
-        * - we can only share with an exact match on most regular files
+        * - we can only share with a superset match on most regular files
         * - shared mappings on character devices and memory backed files are
         *   permitted to overlap inexactly as far as we are concerned for in
         *   these cases, sharing is handled in the driver or filesystem rather
         *   than here
         */
        if (vm_flags & VM_MAYSHARE) {
-               unsigned long pglen = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
-               unsigned long vmpglen;
+               struct vm_region *pregion;
+               unsigned long pglen, rpglen, pgend, rpgend, start;
 
-               /* suppress VMA sharing for shared regions */
-               if (vm_flags & VM_SHARED &&
-                   capabilities & BDI_CAP_MAP_DIRECT)
-                       goto dont_share_VMAs;
+               pglen = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+               pgend = pgoff + pglen;
 
-               for (rb = rb_first(&nommu_vma_tree); rb; rb = rb_next(rb)) {
-                       vma = rb_entry(rb, struct vm_area_struct, vm_rb);
+               for (rb = rb_first(&nommu_region_tree); rb; rb = rb_next(rb)) {
+                       pregion = rb_entry(rb, struct vm_region, vm_rb);
 
-                       if (!(vma->vm_flags & VM_MAYSHARE))
+                       if (!(pregion->vm_flags & VM_MAYSHARE))
                                continue;
 
                        /* search for overlapping mappings on the same file */
-                       if (vma->vm_file->f_path.dentry->d_inode != file->f_path.dentry->d_inode)
+                       if (pregion->vm_file->f_path.dentry->d_inode !=
+                           file->f_path.dentry->d_inode)
                                continue;
 
-                       if (vma->vm_pgoff >= pgoff + pglen)
+                       if (pregion->vm_pgoff >= pgend)
                                continue;
 
-                       vmpglen = vma->vm_end - vma->vm_start + PAGE_SIZE - 1;
-                       vmpglen >>= PAGE_SHIFT;
-                       if (pgoff >= vma->vm_pgoff + vmpglen)
+                       rpglen = pregion->vm_end - pregion->vm_start;
+                       rpglen = (rpglen + PAGE_SIZE - 1) >> PAGE_SHIFT;
+                       rpgend = pregion->vm_pgoff + rpglen;
+                       if (pgoff >= rpgend)
                                continue;
 
-                       /* handle inexactly overlapping matches between mappings */
-                       if (vma->vm_pgoff != pgoff || vmpglen != pglen) {
+                       /* handle inexactly overlapping matches between
+                        * mappings */
+                       if ((pregion->vm_pgoff != pgoff || rpglen != pglen) &&
+                           !(pgoff >= pregion->vm_pgoff && pgend <= rpgend)) {
+                               /* new mapping is not a subset of the region */
                                if (!(capabilities & BDI_CAP_MAP_DIRECT))
                                        goto sharing_violation;
                                continue;
                        }
 
-                       /* we've found a VMA we can share */
-                       atomic_inc(&vma->vm_usage);
-
-                       vml->vma = vma;
-                       result = (void *) vma->vm_start;
-                       goto shared;
+                       /* we've found a region we can share */
+                       pregion->vm_usage++;
+                       vma->vm_region = pregion;
+                       start = pregion->vm_start;
+                       start += (pgoff - pregion->vm_pgoff) << PAGE_SHIFT;
+                       vma->vm_start = start;
+                       vma->vm_end = start + len;
+
+                       if (pregion->vm_flags & VM_MAPPED_COPY) {
+                               kdebug("share copy");
+                               vma->vm_flags |= VM_MAPPED_COPY;
+                       } else {
+                               kdebug("share mmap");
+                               ret = do_mmap_shared_file(vma);
+                               if (ret < 0) {
+                                       vma->vm_region = NULL;
+                                       vma->vm_start = 0;
+                                       vma->vm_end = 0;
+                                       pregion->vm_usage--;
+                                       pregion = NULL;
+                                       goto error_just_free;
+                               }
+                       }
+                       fput(region->vm_file);
+                       kmem_cache_free(vm_region_jar, region);
+                       region = pregion;
+                       result = start;
+                       goto share;
                }
 
-       dont_share_VMAs:
-               vma = NULL;
-
                /* obtain the address at which to make a shared mapping
                 * - this is the hook for quasi-memory character devices to
                 *   tell us the location of a shared mapping
                 */
-               if (file && file->f_op->get_unmapped_area) {
+               if (capabilities & BDI_CAP_MAP_DIRECT) {
                        addr = file->f_op->get_unmapped_area(file, addr, len,
                                                             pgoff, flags);
-                       if (IS_ERR((void *) addr)) {
+                       if (IS_ERR_VALUE(addr)) {
                                ret = addr;
-                               if (ret != (unsigned long) -ENOSYS)
-                                       goto error;
+                               if (ret != -ENOSYS)
+                                       goto error_just_free;
 
                                /* the driver refused to tell us where to site
                                 * the mapping so we'll have to attempt to copy
                                 * it */
-                               ret = (unsigned long) -ENODEV;
+                               ret = -ENODEV;
                                if (!(capabilities & BDI_CAP_MAP_COPY))
-                                       goto error;
+                                       goto error_just_free;
 
                                capabilities &= ~BDI_CAP_MAP_DIRECT;
+                       } else {
+                               vma->vm_start = region->vm_start = addr;
+                               vma->vm_end = region->vm_end = addr + len;
                        }
                }
        }
 
-       /* we're going to need a VMA struct as well */
-       vma = kzalloc(sizeof(struct vm_area_struct), GFP_KERNEL);
-       if (!vma)
-               goto error_getting_vma;
-
-       INIT_LIST_HEAD(&vma->anon_vma_node);
-       atomic_set(&vma->vm_usage, 1);
-       if (file)
-               get_file(file);
-       vma->vm_file    = file;
-       vma->vm_flags   = vm_flags;
-       vma->vm_start   = addr;
-       vma->vm_end     = addr + len;
-       vma->vm_pgoff   = pgoff;
-
-       vml->vma = vma;
+       vma->vm_region = region;
 
-       /* set up the mapping */
+       /* set up the mapping
+        * - the region is filled in if BDI_CAP_MAP_DIRECT is still set
+        */
        if (file && vma->vm_flags & VM_SHARED)
-               ret = do_mmap_shared_file(vma, len);
+               ret = do_mmap_shared_file(vma);
        else
-               ret = do_mmap_private(vma, len);
+               ret = do_mmap_private(vma, region, len, capabilities);
        if (ret < 0)
-               goto error;
-
-       /* okay... we have a mapping; now we have to register it */
-       result = (void *) vma->vm_start;
+               goto error_just_free;
+       add_nommu_region(region);
 
-       if (vma->vm_flags & VM_MAPPED_COPY) {
-               realalloc += kobjsize(result);
-               askedalloc += len;
-       }
+       /* clear anonymous mappings that don't ask for uninitialized data */
+       if (!vma->vm_file && !(flags & MAP_UNINITIALIZED))
+               memset((void *)region->vm_start, 0,
+                      region->vm_end - region->vm_start);
 
-       realalloc += kobjsize(vma);
-       askedalloc += sizeof(*vma);
+       /* okay... we have a mapping; now we have to register it */
+       result = vma->vm_start;
 
        current->mm->total_vm += len >> PAGE_SHIFT;
 
-       add_nommu_vma(vma);
-
- shared:
-       realalloc += kobjsize(vml);
-       askedalloc += sizeof(*vml);
-
-       add_vma_to_mm(current->mm, vml);
+share:
+       add_vma_to_mm(current->mm, vma);
 
-       up_write(&nommu_vma_sem);
-
-       if (prot & PROT_EXEC)
-               flush_icache_range((unsigned long) result,
-                                  (unsigned long) result + len);
+       /* we flush the region from the icache only when the first executable
+        * mapping of it is made  */
+       if (vma->vm_flags & VM_EXEC && !region->vm_icache_flushed) {
+               flush_icache_range(region->vm_start, region->vm_end);
+               region->vm_icache_flushed = true;
+       }
 
-#ifdef DEBUG
-       printk("do_mmap:\n");
-       show_process_blocks();
-#endif
+       up_write(&nommu_region_sem);
 
-       return (unsigned long) result;
+       kleave(" = %lx", result);
+       return result;
 
- error:
-       up_write(&nommu_vma_sem);
-       kfree(vml);
-       if (vma) {
-               if (vma->vm_file)
-                       fput(vma->vm_file);
-               kfree(vma);
-       }
+error_just_free:
+       up_write(&nommu_region_sem);
+error:
+       if (region->vm_file)
+               fput(region->vm_file);
+       kmem_cache_free(vm_region_jar, region);
+       if (vma->vm_file)
+               fput(vma->vm_file);
+       if (vma->vm_flags & VM_EXECUTABLE)
+               removed_exe_file_vma(vma->vm_mm);
+       kmem_cache_free(vm_area_cachep, vma);
+       kleave(" = %d", ret);
        return ret;
 
- sharing_violation:
-       up_write(&nommu_vma_sem);
-       printk("Attempt to share mismatched mappings\n");
-       kfree(vml);
-       return -EINVAL;
+sharing_violation:
+       up_write(&nommu_region_sem);
+       printk(KERN_WARNING "Attempt to share mismatched mappings\n");
+       ret = -EINVAL;
+       goto error;
 
- error_getting_vma:
-       up_write(&nommu_vma_sem);
-       kfree(vml);
-       printk("Allocation of vma for %lu byte allocation from process %d failed\n",
+error_getting_vma:
+       kmem_cache_free(vm_region_jar, region);
+       printk(KERN_WARNING "Allocation of vma for %lu byte allocation"
+              " from process %d failed\n",
               len, current->pid);
-       show_free_areas();
+       show_free_areas(0);
        return -ENOMEM;
 
- error_getting_vml:
-       printk("Allocation of vml for %lu byte allocation from process %d failed\n",
+error_getting_region:
+       printk(KERN_WARNING "Allocation of vm region for %lu byte allocation"
+              " from process %d failed\n",
               len, current->pid);
-       show_free_areas();
+       show_free_areas(0);
        return -ENOMEM;
 }
 EXPORT_SYMBOL(do_mmap_pgoff);
 
+SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
+               unsigned long, prot, unsigned long, flags,
+               unsigned long, fd, unsigned long, pgoff)
+{
+       struct file *file = NULL;
+       unsigned long retval = -EBADF;
+
+       audit_mmap_fd(fd, flags);
+       if (!(flags & MAP_ANONYMOUS)) {
+               file = fget(fd);
+               if (!file)
+                       goto out;
+       }
+
+       flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
+
+       down_write(&current->mm->mmap_sem);
+       retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+       up_write(&current->mm->mmap_sem);
+
+       if (file)
+               fput(file);
+out:
+       return retval;
+}
+
+#ifdef __ARCH_WANT_SYS_OLD_MMAP
+struct mmap_arg_struct {
+       unsigned long addr;
+       unsigned long len;
+       unsigned long prot;
+       unsigned long flags;
+       unsigned long fd;
+       unsigned long offset;
+};
+
+SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg)
+{
+       struct mmap_arg_struct a;
+
+       if (copy_from_user(&a, arg, sizeof(a)))
+               return -EFAULT;
+       if (a.offset & ~PAGE_MASK)
+               return -EINVAL;
+
+       return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
+                             a.offset >> PAGE_SHIFT);
+}
+#endif /* __ARCH_WANT_SYS_OLD_MMAP */
+
 /*
- * handle mapping disposal for uClinux
+ * split a vma into two pieces at address 'addr', a new vma is allocated either
+ * for the first part or the tail.
  */
-static void put_vma(struct vm_area_struct *vma)
+int split_vma(struct mm_struct *mm, struct vm_area_struct *vma,
+             unsigned long addr, int new_below)
 {
-       if (vma) {
-               down_write(&nommu_vma_sem);
+       struct vm_area_struct *new;
+       struct vm_region *region;
+       unsigned long npages;
 
-               if (atomic_dec_and_test(&vma->vm_usage)) {
-                       delete_nommu_vma(vma);
+       kenter("");
 
-                       if (vma->vm_ops && vma->vm_ops->close)
-                               vma->vm_ops->close(vma);
+       /* we're only permitted to split anonymous regions (these should have
+        * only a single usage on the region) */
+       if (vma->vm_file)
+               return -ENOMEM;
 
-                       /* IO memory and memory shared directly out of the pagecache from
-                        * ramfs/tmpfs mustn't be released here */
-                       if (vma->vm_flags & VM_MAPPED_COPY) {
-                               realalloc -= kobjsize((void *) vma->vm_start);
-                               askedalloc -= vma->vm_end - vma->vm_start;
-                               kfree((void *) vma->vm_start);
-                       }
+       if (mm->map_count >= sysctl_max_map_count)
+               return -ENOMEM;
 
-                       realalloc -= kobjsize(vma);
-                       askedalloc -= sizeof(*vma);
+       region = kmem_cache_alloc(vm_region_jar, GFP_KERNEL);
+       if (!region)
+               return -ENOMEM;
 
-                       if (vma->vm_file)
-                               fput(vma->vm_file);
-                       kfree(vma);
-               }
+       new = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
+       if (!new) {
+               kmem_cache_free(vm_region_jar, region);
+               return -ENOMEM;
+       }
+
+       /* most fields are the same, copy all, and then fixup */
+       *new = *vma;
+       *region = *vma->vm_region;
+       new->vm_region = region;
 
-               up_write(&nommu_vma_sem);
+       npages = (addr - vma->vm_start) >> PAGE_SHIFT;
+
+       if (new_below) {
+               region->vm_top = region->vm_end = new->vm_end = addr;
+       } else {
+               region->vm_start = new->vm_start = addr;
+               region->vm_pgoff = new->vm_pgoff += npages;
        }
+
+       if (new->vm_ops && new->vm_ops->open)
+               new->vm_ops->open(new);
+
+       delete_vma_from_mm(vma);
+       down_write(&nommu_region_sem);
+       delete_nommu_region(vma->vm_region);
+       if (new_below) {
+               vma->vm_region->vm_start = vma->vm_start = addr;
+               vma->vm_region->vm_pgoff = vma->vm_pgoff += npages;
+       } else {
+               vma->vm_region->vm_end = vma->vm_end = addr;
+               vma->vm_region->vm_top = addr;
+       }
+       add_nommu_region(vma->vm_region);
+       add_nommu_region(new->vm_region);
+       up_write(&nommu_region_sem);
+       add_vma_to_mm(mm, vma);
+       add_vma_to_mm(mm, new);
+       return 0;
 }
 
 /*
- * release a mapping
- * - under NOMMU conditions the parameters must match exactly to the mapping to
- *   be removed
+ * shrink a VMA by removing the specified chunk from either the beginning or
+ * the end
  */
-int do_munmap(struct mm_struct *mm, unsigned long addr, size_t len)
+static int shrink_vma(struct mm_struct *mm,
+                     struct vm_area_struct *vma,
+                     unsigned long from, unsigned long to)
 {
-       struct vm_list_struct *vml, **parent;
-       unsigned long end = addr + len;
+       struct vm_region *region;
 
-#ifdef DEBUG
-       printk("do_munmap:\n");
-#endif
+       kenter("");
 
-       for (parent = &mm->context.vmlist; *parent; parent = &(*parent)->next) {
-               if ((*parent)->vma->vm_start > addr)
-                       break;
-               if ((*parent)->vma->vm_start == addr &&
-                   ((len == 0) || ((*parent)->vma->vm_end == end)))
-                       goto found;
+       /* adjust the VMA's pointers, which may reposition it in the MM's tree
+        * and list */
+       delete_vma_from_mm(vma);
+       if (from > vma->vm_start)
+               vma->vm_end = from;
+       else
+               vma->vm_start = to;
+       add_vma_to_mm(mm, vma);
+
+       /* cut the backing region down to size */
+       region = vma->vm_region;
+       BUG_ON(region->vm_usage != 1);
+
+       down_write(&nommu_region_sem);
+       delete_nommu_region(region);
+       if (from > region->vm_start) {
+               to = region->vm_top;
+               region->vm_top = region->vm_end = from;
+       } else {
+               region->vm_start = to;
        }
+       add_nommu_region(region);
+       up_write(&nommu_region_sem);
 
-       printk("munmap of non-mmaped memory by process %d (%s): %p\n",
-              current->pid, current->comm, (void *) addr);
-       return -EINVAL;
+       free_page_series(from, to);
+       return 0;
+}
 
- found:
-       vml = *parent;
+/*
+ * release a mapping
+ * - under NOMMU conditions the chunk to be unmapped must be backed by a single
+ *   VMA, though it need not cover the whole VMA
+ */
+int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
+{
+       struct vm_area_struct *vma;
+       unsigned long end;
+       int ret;
 
-       put_vma(vml->vma);
+       kenter(",%lx,%zx", start, len);
 
-       *parent = vml->next;
-       realalloc -= kobjsize(vml);
-       askedalloc -= sizeof(*vml);
-       kfree(vml);
+       len = PAGE_ALIGN(len);
+       if (len == 0)
+               return -EINVAL;
 
-       update_hiwater_vm(mm);
-       mm->total_vm -= len >> PAGE_SHIFT;
+       end = start + len;
+
+       /* find the first potentially overlapping VMA */
+       vma = find_vma(mm, start);
+       if (!vma) {
+               static int limit = 0;
+               if (limit < 5) {
+                       printk(KERN_WARNING
+                              "munmap of memory not mmapped by process %d"
+                              " (%s): 0x%lx-0x%lx\n",
+                              current->pid, current->comm,
+                              start, start + len - 1);
+                       limit++;
+               }
+               return -EINVAL;
+       }
 
-#ifdef DEBUG
-       show_process_blocks();
-#endif
+       /* we're allowed to split an anonymous VMA but not a file-backed one */
+       if (vma->vm_file) {
+               do {
+                       if (start > vma->vm_start) {
+                               kleave(" = -EINVAL [miss]");
+                               return -EINVAL;
+                       }
+                       if (end == vma->vm_end)
+                               goto erase_whole_vma;
+                       vma = vma->vm_next;
+               } while (vma);
+               kleave(" = -EINVAL [split file]");
+               return -EINVAL;
+       } else {
+               /* the chunk must be a subset of the VMA found */
+               if (start == vma->vm_start && end == vma->vm_end)
+                       goto erase_whole_vma;
+               if (start < vma->vm_start || end > vma->vm_end) {
+                       kleave(" = -EINVAL [superset]");
+                       return -EINVAL;
+               }
+               if (start & ~PAGE_MASK) {
+                       kleave(" = -EINVAL [unaligned start]");
+                       return -EINVAL;
+               }
+               if (end != vma->vm_end && end & ~PAGE_MASK) {
+                       kleave(" = -EINVAL [unaligned split]");
+                       return -EINVAL;
+               }
+               if (start != vma->vm_start && end != vma->vm_end) {
+                       ret = split_vma(mm, vma, start, 1);
+                       if (ret < 0) {
+                               kleave(" = %d [split]", ret);
+                               return ret;
+                       }
+               }
+               return shrink_vma(mm, vma, start, end);
+       }
 
+erase_whole_vma:
+       delete_vma_from_mm(vma);
+       delete_vma(mm, vma);
+       kleave(" = 0");
        return 0;
 }
 EXPORT_SYMBOL(do_munmap);
 
-asmlinkage long sys_munmap(unsigned long addr, size_t len)
+SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
 {
        int ret;
        struct mm_struct *mm = current->mm;
@@ -1139,32 +1719,27 @@ asmlinkage long sys_munmap(unsigned long addr, size_t len)
 }
 
 /*
- * Release all mappings
+ * release all the mappings made in a process's VM space
  */
-void exit_mmap(struct mm_struct * mm)
+void exit_mmap(struct mm_struct *mm)
 {
-       struct vm_list_struct *tmp;
-
-       if (mm) {
-#ifdef DEBUG
-               printk("Exit_mmap:\n");
-#endif
+       struct vm_area_struct *vma;
 
-               mm->total_vm = 0;
+       if (!mm)
+               return;
 
-               while ((tmp = mm->context.vmlist)) {
-                       mm->context.vmlist = tmp->next;
-                       put_vma(tmp->vma);
+       kenter("");
 
-                       realalloc -= kobjsize(tmp);
-                       askedalloc -= sizeof(*tmp);
-                       kfree(tmp);
-               }
+       mm->total_vm = 0;
 
-#ifdef DEBUG
-               show_process_blocks();
-#endif
+       while ((vma = mm->mmap)) {
+               mm->mmap = vma->vm_next;
+               delete_vma_from_mm(vma);
+               delete_vma(mm, vma);
+               cond_resched();
        }
+
+       kleave("");
 }
 
 unsigned long do_brk(unsigned long addr, unsigned long len)
@@ -1177,8 +1752,8 @@ unsigned long do_brk(unsigned long addr, unsigned long len)
  * time (controlled by the MREMAP_MAYMOVE flag and available VM space)
  *
  * under NOMMU conditions, we only permit changing a mapping's size, and only
- * as long as it stays within the hole allocated by the kmalloc() call in
- * do_mmap_pgoff() and the block is not shareable
+ * as long as it stays within the region allocated by do_mmap_private() and the
+ * block is not shareable
  *
  * MREMAP_FIXED is not supported under NOMMU conditions
  */
@@ -1189,13 +1764,18 @@ unsigned long do_mremap(unsigned long addr,
        struct vm_area_struct *vma;
 
        /* insanity checks first */
-       if (new_len == 0)
+       old_len = PAGE_ALIGN(old_len);
+       new_len = PAGE_ALIGN(new_len);
+       if (old_len == 0 || new_len == 0)
                return (unsigned long) -EINVAL;
 
+       if (addr & ~PAGE_MASK)
+               return -EINVAL;
+
        if (flags & MREMAP_FIXED && new_addr != addr)
                return (unsigned long) -EINVAL;
 
-       vma = find_vma_exact(current->mm, addr);
+       vma = find_vma_exact(current->mm, addr, old_len);
        if (!vma)
                return (unsigned long) -EINVAL;
 
@@ -1205,22 +1785,18 @@ unsigned long do_mremap(unsigned long addr,
        if (vma->vm_flags & VM_MAYSHARE)
                return (unsigned long) -EPERM;
 
-       if (new_len > kobjsize((void *) addr))
+       if (new_len > vma->vm_region->vm_end - vma->vm_region->vm_start)
                return (unsigned long) -ENOMEM;
 
        /* all checks complete - do it */
        vma->vm_end = vma->vm_start + new_len;
-
-       askedalloc -= old_len;
-       askedalloc += new_len;
-
        return vma->vm_start;
 }
 EXPORT_SYMBOL(do_mremap);
 
-asmlinkage unsigned long sys_mremap(unsigned long addr,
-       unsigned long old_len, unsigned long new_len,
-       unsigned long flags, unsigned long new_addr)
+SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
+               unsigned long, new_len, unsigned long, flags,
+               unsigned long, new_addr)
 {
        unsigned long ret;
 
@@ -1236,10 +1812,13 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
        return NULL;
 }
 
-int remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
-               unsigned long to, unsigned long size, pgprot_t prot)
+int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
+               unsigned long pfn, unsigned long size, pgprot_t prot)
 {
-       vma->vm_start = vma->vm_pgoff << PAGE_SHIFT;
+       if (addr != (pfn << PAGE_SHIFT))
+               return -EINVAL;
+
+       vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
        return 0;
 }
 EXPORT_SYMBOL(remap_pfn_range);
@@ -1259,10 +1838,6 @@ int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
 }
 EXPORT_SYMBOL(remap_vmalloc_range);
 
-void swap_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
-{
-}
-
 unsigned long arch_get_unmapped_area(struct file *file, unsigned long addr,
        unsigned long len, unsigned long pgoff, unsigned long flags)
 {
@@ -1281,27 +1856,6 @@ void unmap_mapping_range(struct address_space *mapping,
 EXPORT_SYMBOL(unmap_mapping_range);
 
 /*
- * ask for an unmapped area at which to create a mapping on a file
- */
-unsigned long get_unmapped_area(struct file *file, unsigned long addr,
-                               unsigned long len, unsigned long pgoff,
-                               unsigned long flags)
-{
-       unsigned long (*get_area)(struct file *, unsigned long, unsigned long,
-                                 unsigned long, unsigned long);
-
-       get_area = current->mm->get_unmapped_area;
-       if (file && file->f_op && file->f_op->get_unmapped_area)
-               get_area = file->f_op->get_unmapped_area;
-
-       if (!get_area)
-               return -ENOSYS;
-
-       return get_area(file, addr, len, pgoff, flags);
-}
-EXPORT_SYMBOL(get_unmapped_area);
-
-/*
  * Check that a process has enough memory to allocate a new virtual
  * mapping. 0 means there is enough memory for the allocation to
  * succeed and -ENOMEM implies there is not.
@@ -1330,9 +1884,17 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
                return 0;
 
        if (sysctl_overcommit_memory == OVERCOMMIT_GUESS) {
-               unsigned long n;
+               free = global_page_state(NR_FREE_PAGES);
+               free += global_page_state(NR_FILE_PAGES);
+
+               /*
+                * shmem pages shouldn't be counted as free in this
+                * case, they can't be purged, only swapped out, and
+                * that won't affect the overall amount of available
+                * memory in the system.
+                */
+               free -= global_page_state(NR_SHMEM);
 
-               free = global_page_state(NR_FILE_PAGES);
                free += nr_swap_pages;
 
                /*
@@ -1344,34 +1906,18 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
                free += global_page_state(NR_SLAB_RECLAIMABLE);
 
                /*
-                * Leave the last 3% for root
-                */
-               if (!cap_sys_admin)
-                       free -= free / 32;
-
-               if (free > pages)
-                       return 0;
-
-               /*
-                * nr_free_pages() is very expensive on large systems,
-                * only call if we're about to fail.
-                */
-               n = nr_free_pages();
-
-               /*
                 * Leave reserved pages. The pages are not for anonymous pages.
                 */
-               if (n <= totalreserve_pages)
+               if (free <= totalreserve_pages)
                        goto error;
                else
-                       n -= totalreserve_pages;
+                       free -= totalreserve_pages;
 
                /*
                 * Leave the last 3% for root
                 */
                if (!cap_sys_admin)
-                       n -= n / 32;
-               free += n;
+                       free -= free / 32;
 
                if (free > pages)
                        return 0;
@@ -1389,21 +1935,19 @@ 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
-        * sometimes has a negative value
-        */
-       if (atomic_read(&vm_committed_space) < (long)allowed)
+       if (percpu_counter_read_positive(&vm_committed_as) < allowed)
                return 0;
+
 error:
        vm_unacct_memory(pages);
 
        return -ENOMEM;
 }
 
-int in_gate_area_no_task(unsigned long addr)
+int in_gate_area_no_mm(unsigned long addr)
 {
        return 0;
 }
@@ -1415,21 +1959,10 @@ int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 }
 EXPORT_SYMBOL(filemap_fault);
 
-/*
- * Access another process' address space.
- * - source/target buffer must be kernel space
- */
-int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write)
+static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
+               unsigned long addr, void *buf, int len, int write)
 {
        struct vm_area_struct *vma;
-       struct mm_struct *mm;
-
-       if (addr + len < addr)
-               return 0;
-
-       mm = get_task_mm(tsk);
-       if (!mm)
-               return 0;
 
        down_read(&mm->mmap_sem);
 
@@ -1442,9 +1975,11 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, in
 
                /* only read or write mappings where it is permitted */
                if (write && vma->vm_flags & VM_MAYWRITE)
-                       len -= copy_to_user((void *) addr, buf, len);
+                       copy_to_user_page(vma, NULL, addr,
+                                        (void *) addr, buf, len);
                else if (!write && vma->vm_flags & VM_MAYREAD)
-                       len -= copy_from_user(buf, (void *) addr, len);
+                       copy_from_user_page(vma, NULL, addr,
+                                           buf, (void *) addr, len);
                else
                        len = 0;
        } else {
@@ -1452,6 +1987,105 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, in
        }
 
        up_read(&mm->mmap_sem);
+
+       return len;
+}
+
+/**
+ * @access_remote_vm - access another process' address space
+ * @mm:                the mm_struct of the target address space
+ * @addr:      start address to access
+ * @buf:       source or destination buffer
+ * @len:       number of bytes to transfer
+ * @write:     whether the access is a write
+ *
+ * The caller must hold a reference on @mm.
+ */
+int access_remote_vm(struct mm_struct *mm, unsigned long addr,
+               void *buf, int len, int write)
+{
+       return __access_remote_vm(NULL, mm, addr, buf, len, write);
+}
+
+/*
+ * Access another process' address space.
+ * - source/target buffer must be kernel space
+ */
+int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write)
+{
+       struct mm_struct *mm;
+
+       if (addr + len < addr)
+               return 0;
+
+       mm = get_task_mm(tsk);
+       if (!mm)
+               return 0;
+
+       len = __access_remote_vm(tsk, mm, addr, buf, len, write);
+
        mmput(mm);
        return len;
 }
+
+/**
+ * nommu_shrink_inode_mappings - Shrink the shared mappings on an inode
+ * @inode: The inode to check
+ * @size: The current filesize of the inode
+ * @newsize: The proposed filesize of the inode
+ *
+ * Check the shared mappings on an inode on behalf of a shrinking truncate to
+ * make sure that that any outstanding VMAs aren't broken and then shrink the
+ * vm_regions that extend that beyond so that do_mmap_pgoff() doesn't
+ * automatically grant mappings that are too large.
+ */
+int nommu_shrink_inode_mappings(struct inode *inode, size_t size,
+                               size_t newsize)
+{
+       struct vm_area_struct *vma;
+       struct prio_tree_iter iter;
+       struct vm_region *region;
+       pgoff_t low, high;
+       size_t r_size, r_top;
+
+       low = newsize >> PAGE_SHIFT;
+       high = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
+
+       down_write(&nommu_region_sem);
+
+       /* search for VMAs that fall within the dead zone */
+       vma_prio_tree_foreach(vma, &iter, &inode->i_mapping->i_mmap,
+                             low, high) {
+               /* found one - only interested if it's shared out of the page
+                * cache */
+               if (vma->vm_flags & VM_SHARED) {
+                       up_write(&nommu_region_sem);
+                       return -ETXTBSY; /* not quite true, but near enough */
+               }
+       }
+
+       /* reduce any regions that overlap the dead zone - if in existence,
+        * these will be pointed to by VMAs that don't overlap the dead zone
+        *
+        * we don't check for any regions that start beyond the EOF as there
+        * shouldn't be any
+        */
+       vma_prio_tree_foreach(vma, &iter, &inode->i_mapping->i_mmap,
+                             0, ULONG_MAX) {
+               if (!(vma->vm_flags & VM_SHARED))
+                       continue;
+
+               region = vma->vm_region;
+               r_size = region->vm_top - region->vm_start;
+               r_top = (region->vm_pgoff << PAGE_SHIFT) + r_size;
+
+               if (r_top > newsize) {
+                       region->vm_top -= r_top - newsize;
+                       if (region->vm_end > region->vm_top)
+                               region->vm_end = region->vm_top;
+               }
+       }
+
+       up_write(&nommu_region_sem);
+       return 0;
+}