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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Add hook in get_user_pages to allow lookups of foreign mapped pages.
# HG changeset patch
# User akw27@xxxxxxxxxxxxxxxxxxxxxx
# Node ID f6e7c967212e5c0098e6f6cdbc9cdac042d9124c
# Parent f8acd354e1295226fbda14aaf8bd164e07b93742
Add hook in get_user_pages to allow lookups of foreign mapped pages.
Direct IO to userspace (e.g. with libaio) needs to map user virtual addresses
down to page structs. This patch adds a new vma flag (VM_FOREIGN) to tell
get_user_pages that there are foreign frames in the vma. If VM_FOREIGN is set
vm_private_data points to a map of struct page pointers, indicating the
physical page underpinning the vaddr.
After a fair bit of discussion with Keir, this seems to be the least
intrusive way to allow this sort of lookup. If this solves things, we
can pull the VM_FOREIGN clause out into make it a noop on non-Xen
arches in the same way that the gate_area check above it is.
diff -r f8acd354e129 -r f6e7c967212e linux-2.6.11-xen-sparse/mm/memory.c
--- a/linux-2.6.11-xen-sparse/mm/memory.c Sun Jul 3 22:36:48 2005
+++ b/linux-2.6.11-xen-sparse/mm/memory.c Mon Jul 4 15:31:47 2005
@@ -907,6 +907,24 @@
continue;
}
+ if (vma && (vma->vm_flags & VM_FOREIGN))
+ {
+ struct page **map = vma->vm_private_data;
+ int offset = (start - vma->vm_start) >> PAGE_SHIFT;
+
+ if (map[offset] != NULL) {
+ if (pages) {
+ pages[i] = map[offset];
+ }
+ if (vmas)
+ vmas[i] = vma;
+ i++;
+ start += PAGE_SIZE;
+ len--;
+ continue;
+ }
+ }
+
if (!vma || (vma->vm_flags & VM_IO)
|| !(flags & vma->vm_flags))
return i ? : -EFAULT;
diff -r f8acd354e129 -r f6e7c967212e linux-2.6.11-xen-sparse/include/linux/mm.h
--- /dev/null Sun Jul 3 22:36:48 2005
+++ b/linux-2.6.11-xen-sparse/include/linux/mm.h Mon Jul 4 15:31:47 2005
@@ -0,0 +1,865 @@
+#ifndef _LINUX_MM_H
+#define _LINUX_MM_H
+
+#include <linux/sched.h>
+#include <linux/errno.h>
+
+#ifdef __KERNEL__
+
+#include <linux/config.h>
+#include <linux/gfp.h>
+#include <linux/list.h>
+#include <linux/mmzone.h>
+#include <linux/rbtree.h>
+#include <linux/prio_tree.h>
+#include <linux/fs.h>
+
+struct mempolicy;
+struct anon_vma;
+
+#ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */
+extern unsigned long max_mapnr;
+#endif
+
+extern unsigned long num_physpages;
+extern void * high_memory;
+extern unsigned long vmalloc_earlyreserve;
+extern int page_cluster;
+
+#ifdef CONFIG_SYSCTL
+extern int sysctl_legacy_va_layout;
+#else
+#define sysctl_legacy_va_layout 0
+#endif
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/atomic.h>
+
+#ifndef MM_VM_SIZE
+#define MM_VM_SIZE(mm) ((TASK_SIZE + PGDIR_SIZE - 1) & PGDIR_MASK)
+#endif
+
+#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
+
+/*
+ * Linux kernel virtual memory manager primitives.
+ * The idea being to have a "virtual" mm in the same way
+ * we have a virtual fs - giving a cleaner interface to the
+ * mm details, and allowing different kinds of memory mappings
+ * (from shared memory to executable loading to arbitrary
+ * mmap() functions).
+ */
+
+/*
+ * This struct defines a memory VMM memory area. There is one of these
+ * per VM-area/task. A VM area is any part of the process virtual memory
+ * space that has a special rule for the page-fault handlers (ie a shared
+ * library, the executable area etc).
+ */
+struct vm_area_struct {
+ struct mm_struct * vm_mm; /* The address space we belong to. */
+ unsigned long vm_start; /* Our start address within vm_mm. */
+ unsigned long vm_end; /* The first byte after our end address
+ within vm_mm. */
+
+ /* linked list of VM areas per task, sorted by address */
+ struct vm_area_struct *vm_next;
+
+ pgprot_t vm_page_prot; /* Access permissions of this VMA. */
+ unsigned long vm_flags; /* Flags, listed below. */
+
+ struct rb_node vm_rb;
+
+ /*
+ * For areas with an address space and backing store,
+ * linkage into the address_space->i_mmap prio tree, or
+ * linkage to the list of like vmas hanging off its node, or
+ * linkage of vma in the address_space->i_mmap_nonlinear list.
+ */
+ union {
+ struct {
+ struct list_head list;
+ void *parent; /* aligns with prio_tree_node parent */
+ struct vm_area_struct *head;
+ } vm_set;
+
+ struct raw_prio_tree_node prio_tree_node;
+ } shared;
+
+ /*
+ * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
+ * list, after a COW of one of the file pages. A MAP_SHARED vma
+ * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack
+ * or brk vma (with NULL file) can only be in an anon_vma list.
+ */
+ struct list_head anon_vma_node; /* Serialized by anon_vma->lock */
+ struct anon_vma *anon_vma; /* Serialized by page_table_lock */
+
+ /* Function pointers to deal with this struct. */
+ struct vm_operations_struct * vm_ops;
+
+ /* Information about our backing store: */
+ unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
+ units, *not* PAGE_CACHE_SIZE */
+ struct file * vm_file; /* File we map to (can be NULL). */
+ void * vm_private_data; /* was vm_pte (shared mem) */
+ unsigned long vm_truncate_count;/* truncate_count or restart_addr */
+
+#ifndef CONFIG_MMU
+ atomic_t vm_usage; /* refcount (VMAs shared if !MMU) */
+#endif
+#ifdef CONFIG_NUMA
+ struct mempolicy *vm_policy; /* NUMA policy for the VMA */
+#endif
+};
+
+/*
+ * This struct defines the per-mm list of VMAs for uClinux. If CONFIG_MMU is
+ * disabled, then there's a single shared list of VMAs maintained by the
+ * system, and mm's subscribe to these individually
+ */
+struct vm_list_struct {
+ struct vm_list_struct *next;
+ struct vm_area_struct *vma;
+};
+
+#ifndef CONFIG_MMU
+extern struct rb_root nommu_vma_tree;
+extern struct rw_semaphore nommu_vma_sem;
+
+extern unsigned int kobjsize(const void *objp);
+#endif
+
+/*
+ * vm_flags..
+ */
+#define VM_READ 0x00000001 /* currently active flags */
+#define VM_WRITE 0x00000002
+#define VM_EXEC 0x00000004
+#define VM_SHARED 0x00000008
+
+#define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */
+#define VM_MAYWRITE 0x00000020
+#define VM_MAYEXEC 0x00000040
+#define VM_MAYSHARE 0x00000080
+
+#define VM_GROWSDOWN 0x00000100 /* general info on the segment */
+#define VM_GROWSUP 0x00000200
+#define VM_SHM 0x00000400 /* shared memory area, don't swap out */
+#define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */
+
+#define VM_EXECUTABLE 0x00001000
+#define VM_LOCKED 0x00002000
+#define VM_IO 0x00004000 /* Memory mapped I/O or similar */
+
+ /* Used by sys_madvise() */
+#define VM_SEQ_READ 0x00008000 /* App will access data sequentially */
+#define VM_RAND_READ 0x00010000 /* App will not benefit from clustered
reads */
+
+#define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */
+#define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */
+#define VM_RESERVED 0x00080000 /* Don't unmap it from swap_out */
+#define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */
+#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
+#define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
+#define VM_FOREIGN 0x01000000 /* Has pages belonging to another VM */
+
+#ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
+#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
+#endif
+
+#ifdef CONFIG_STACK_GROWSUP
+#define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
+#else
+#define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT)
+#endif
+
+#define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ)
+#define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK
+#define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK))
+#define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ)
+#define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ)
+
+/*
+ * mapping from the currently active vm_flags protection bits (the
+ * low four bits) to a page protection mask..
+ */
+extern pgprot_t protection_map[16];
+
+
+/*
+ * These are the virtual MM functions - opening of an area, closing and
+ * unmapping it (needed to keep files on disk up-to-date etc), pointer
+ * to the functions called when a no-page or a wp-page exception occurs.
+ */
+struct vm_operations_struct {
+ void (*open)(struct vm_area_struct * area);
+ void (*close)(struct vm_area_struct * area);
+ struct page * (*nopage)(struct vm_area_struct * area, unsigned long
address, int *type);
+ int (*populate)(struct vm_area_struct * area, unsigned long address,
unsigned long len, pgprot_t prot, unsigned long pgoff, int nonblock);
+#ifdef CONFIG_NUMA
+ int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
+ struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
+ unsigned long addr);
+#endif
+};
+
+struct mmu_gather;
+struct inode;
+
+#ifdef ARCH_HAS_ATOMIC_UNSIGNED
+typedef unsigned page_flags_t;
+#else
+typedef unsigned long page_flags_t;
+#endif
+
+/*
+ * Each physical page in the system has a struct page associated with
+ * it to keep track of whatever it is we are using the page for at the
+ * moment. Note that we have no way to track which tasks are using
+ * a page.
+ */
+struct page {
+ page_flags_t flags; /* Atomic flags, some possibly
+ * updated asynchronously */
+ atomic_t _count; /* Usage count, see below. */
+ atomic_t _mapcount; /* Count of ptes mapped in mms,
+ * to show when page is mapped
+ * & limit reverse map searches.
+ */
+ unsigned long private; /* Mapping-private opaque data:
+ * usually used for buffer_heads
+ * if PagePrivate set; used for
+ * swp_entry_t if PageSwapCache
+ * When page is free, this indicates
+ * order in the buddy system.
+ */
+ struct address_space *mapping; /* If low bit clear, points to
+ * inode address_space, or NULL.
+ * If page mapped as anonymous
+ * memory, low bit is set, and
+ * it points to anon_vma object:
+ * see PAGE_MAPPING_ANON below.
+ */
+ pgoff_t index; /* Our offset within mapping. */
+ struct list_head lru; /* Pageout list, eg. active_list
+ * protected by zone->lru_lock !
+ */
+ /*
+ * On machines where all RAM is mapped into kernel address space,
+ * we can simply calculate the virtual address. On machines with
+ * highmem some memory is mapped into kernel virtual memory
+ * dynamically, so we need a place to store that address.
+ * Note that this field could be 16 bits on x86 ... ;)
+ *
+ * Architectures with slow multiplication can define
+ * WANT_PAGE_VIRTUAL in asm/page.h
+ */
+#if defined(WANT_PAGE_VIRTUAL)
+ void *virtual; /* Kernel virtual address (NULL if
+ not kmapped, ie. highmem) */
+#endif /* WANT_PAGE_VIRTUAL */
+};
+
+/*
+ * FIXME: take this include out, include page-flags.h in
+ * files which need it (119 of them)
+ */
+#include <linux/page-flags.h>
+
+/*
+ * Methods to modify the page usage count.
+ *
+ * What counts for a page usage:
+ * - cache mapping (page->mapping)
+ * - private data (page->private)
+ * - page mapped in a task's page tables, each mapping
+ * is counted separately
+ *
+ * Also, many kernel routines increase the page count before a critical
+ * routine so they can be sure the page doesn't go away from under them.
+ *
+ * Since 2.6.6 (approx), a free page has ->_count = -1. This is so that we
+ * can use atomic_add_negative(-1, page->_count) to detect when the page
+ * becomes free and so that we can also use atomic_inc_and_test to atomically
+ * detect when we just tried to grab a ref on a page which some other CPU has
+ * already deemed to be freeable.
+ *
+ * NO code should make assumptions about this internal detail! Use the
provided
+ * macros which retain the old rules: page_count(page) == 0 is a free page.
+ */
+
+/*
+ * Drop a ref, return true if the logical refcount fell to zero (the page has
+ * no users)
+ */
+#define put_page_testzero(p) \
+ ({ \
+ BUG_ON(page_count(p) == 0); \
+ atomic_add_negative(-1, &(p)->_count); \
+ })
+
+/*
+ * Grab a ref, return true if the page previously had a logical refcount of
+ * zero. ie: returns true if we just grabbed an already-deemed-to-be-free page
+ */
+#define get_page_testone(p) atomic_inc_and_test(&(p)->_count)
+
+#define set_page_count(p,v) atomic_set(&(p)->_count, v - 1)
+#define __put_page(p) atomic_dec(&(p)->_count)
+
+extern void FASTCALL(__page_cache_release(struct page *));
+
+#ifdef CONFIG_HUGETLB_PAGE
+
+static inline int page_count(struct page *p)
+{
+ if (PageCompound(p))
+ p = (struct page *)p->private;
+ return atomic_read(&(p)->_count) + 1;
+}
+
+static inline void get_page(struct page *page)
+{
+ if (unlikely(PageCompound(page)))
+ page = (struct page *)page->private;
+ atomic_inc(&page->_count);
+}
+
+void put_page(struct page *page);
+
+#else /* CONFIG_HUGETLB_PAGE */
+
+#define page_count(p) (atomic_read(&(p)->_count) + 1)
+
+static inline void get_page(struct page *page)
+{
+ atomic_inc(&page->_count);
+}
+
+static inline void put_page(struct page *page)
+{
+ if (!PageReserved(page) && put_page_testzero(page))
+ __page_cache_release(page);
+}
+
+#endif /* CONFIG_HUGETLB_PAGE */
+
+/*
+ * Multiple processes may "see" the same page. E.g. for untouched
+ * mappings of /dev/null, all processes see the same page full of
+ * zeroes, and text pages of executables and shared libraries have
+ * only one copy in memory, at most, normally.
+ *
+ * For the non-reserved pages, page_count(page) denotes a reference count.
+ * page_count() == 0 means the page is free.
+ * page_count() == 1 means the page is used for exactly one purpose
+ * (e.g. a private data page of one process).
+ *
+ * A page may be used for kmalloc() or anyone else who does a
+ * __get_free_page(). In this case the page_count() is at least 1, and
+ * all other fields are unused but should be 0 or NULL. The
+ * management of this page is the responsibility of the one who uses
+ * it.
+ *
+ * The other pages (we may call them "process pages") are completely
+ * managed by the Linux memory manager: I/O, buffers, swapping etc.
+ * The following discussion applies only to them.
+ *
+ * A page may belong to an inode's memory mapping. In this case,
+ * page->mapping is the pointer to the inode, and page->index is the
+ * file offset of the page, in units of PAGE_CACHE_SIZE.
+ *
+ * A page contains an opaque `private' member, which belongs to the
+ * page's address_space. Usually, this is the address of a circular
+ * list of the page's disk buffers.
+ *
+ * For pages belonging to inodes, the page_count() is the number of
+ * attaches, plus 1 if `private' contains something, plus one for
+ * the page cache itself.
+ *
+ * All pages belonging to an inode are in these doubly linked lists:
+ * mapping->clean_pages, mapping->dirty_pages and mapping->locked_pages;
+ * using the page->list list_head. These fields are also used for
+ * freelist managemet (when page_count()==0).
+ *
+ * There is also a per-mapping radix tree mapping index to the page
+ * in memory if present. The tree is rooted at mapping->root.
+ *
+ * All process pages can do I/O:
+ * - inode pages may need to be read from disk,
+ * - inode pages which have been modified and are MAP_SHARED may need
+ * to be written to disk,
+ * - private pages which have been modified may need to be swapped out
+ * to swap space and (later) to be read back into memory.
+ */
+
+/*
+ * The zone field is never updated after free_area_init_core()
+ * sets it, so none of the operations on it need to be atomic.
+ * We'll have up to (MAX_NUMNODES * MAX_NR_ZONES) zones total,
+ * so we use (MAX_NODES_SHIFT + MAX_ZONES_SHIFT) here to get enough bits.
+ */
+#define NODEZONE_SHIFT (sizeof(page_flags_t)*8 - MAX_NODES_SHIFT -
MAX_ZONES_SHIFT)
+#define NODEZONE(node, zone) ((node << ZONES_SHIFT) | zone)
+
+static inline unsigned long page_zonenum(struct page *page)
+{
+ return (page->flags >> NODEZONE_SHIFT) & (~(~0UL << ZONES_SHIFT));
+}
+static inline unsigned long page_to_nid(struct page *page)
+{
+ return (page->flags >> (NODEZONE_SHIFT + ZONES_SHIFT));
+}
+
+struct zone;
+extern struct zone *zone_table[];
+
+static inline struct zone *page_zone(struct page *page)
+{
+ return zone_table[page->flags >> NODEZONE_SHIFT];
+}
+
+static inline void set_page_zone(struct page *page, unsigned long nodezone_num)
+{
+ page->flags &= ~(~0UL << NODEZONE_SHIFT);
+ page->flags |= nodezone_num << NODEZONE_SHIFT;
+}
+
+#ifndef CONFIG_DISCONTIGMEM
+/* The array of struct pages - for discontigmem use pgdat->lmem_map */
+extern struct page *mem_map;
+#endif
+
+static inline void *lowmem_page_address(struct page *page)
+{
+ return __va(page_to_pfn(page) << PAGE_SHIFT);
+}
+
+#if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)
+#define HASHED_PAGE_VIRTUAL
+#endif
+
+#if defined(WANT_PAGE_VIRTUAL)
+#define page_address(page) ((page)->virtual)
+#define set_page_address(page, address) \
+ do { \
+ (page)->virtual = (address); \
+ } while(0)
+#define page_address_init() do { } while(0)
+#endif
+
+#if defined(HASHED_PAGE_VIRTUAL)
+void *page_address(struct page *page);
+void set_page_address(struct page *page, void *virtual);
+void page_address_init(void);
+#endif
+
+#if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
+#define page_address(page) lowmem_page_address(page)
+#define set_page_address(page, address) do { } while(0)
+#define page_address_init() do { } while(0)
+#endif
+
+/*
+ * On an anonymous page mapped into a user virtual memory area,
+ * page->mapping points to its anon_vma, not to a struct address_space;
+ * with the PAGE_MAPPING_ANON bit set to distinguish it.
+ *
+ * Please note that, confusingly, "page_mapping" refers to the inode
+ * address_space which maps the page from disk; whereas "page_mapped"
+ * refers to user virtual address space into which the page is mapped.
+ */
+#define PAGE_MAPPING_ANON 1
+
+extern struct address_space swapper_space;
+static inline struct address_space *page_mapping(struct page *page)
+{
+ struct address_space *mapping = page->mapping;
+
+ if (unlikely(PageSwapCache(page)))
+ mapping = &swapper_space;
+ else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON))
+ mapping = NULL;
+ return mapping;
+}
+
+static inline int PageAnon(struct page *page)
+{
+ return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0;
+}
+
+/*
+ * Return the pagecache index of the passed page. Regular pagecache pages
+ * use ->index whereas swapcache pages use ->private
+ */
+static inline pgoff_t page_index(struct page *page)
+{
+ if (unlikely(PageSwapCache(page)))
+ return page->private;
+ return page->index;
+}
+
+/*
+ * The atomic page->_mapcount, like _count, starts from -1:
+ * so that transitions both from it and to it can be tracked,
+ * using atomic_inc_and_test and atomic_add_negative(-1).
+ */
+static inline void reset_page_mapcount(struct page *page)
+{
+ atomic_set(&(page)->_mapcount, -1);
+}
+
+static inline int page_mapcount(struct page *page)
+{
+ return atomic_read(&(page)->_mapcount) + 1;
+}
+
+/*
+ * Return true if this page is mapped into pagetables.
+ */
+static inline int page_mapped(struct page *page)
+{
+ return atomic_read(&(page)->_mapcount) >= 0;
+}
+
+/*
+ * Error return values for the *_nopage functions
+ */
+#define NOPAGE_SIGBUS (NULL)
+#define NOPAGE_OOM ((struct page *) (-1))
+
+/*
+ * Different kinds of faults, as returned by handle_mm_fault().
+ * Used to decide whether a process gets delivered SIGBUS or
+ * just gets major/minor fault counters bumped up.
+ */
+#define VM_FAULT_OOM (-1)
+#define VM_FAULT_SIGBUS 0
+#define VM_FAULT_MINOR 1
+#define VM_FAULT_MAJOR 2
+
+#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
+
+extern void show_free_areas(void);
+
+#ifdef CONFIG_SHMEM
+struct page *shmem_nopage(struct vm_area_struct *vma,
+ unsigned long address, int *type);
+int shmem_set_policy(struct vm_area_struct *vma, struct mempolicy *new);
+struct mempolicy *shmem_get_policy(struct vm_area_struct *vma,
+ unsigned long addr);
+int shmem_lock(struct file *file, int lock, struct user_struct *user);
+#else
+#define shmem_nopage filemap_nopage
+#define shmem_lock(a, b, c) ({0;}) /* always in memory, no need to lock */
+#define shmem_set_policy(a, b) (0)
+#define shmem_get_policy(a, b) (NULL)
+#endif
+struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags);
+
+int shmem_zero_setup(struct vm_area_struct *);
+
+static inline int can_do_mlock(void)
+{
+ if (capable(CAP_IPC_LOCK))
+ return 1;
+ if (current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur != 0)
+ return 1;
+ return 0;
+}
+extern int user_shm_lock(size_t, struct user_struct *);
+extern void user_shm_unlock(size_t, struct user_struct *);
+
+/*
+ * Parameter block passed down to zap_pte_range in exceptional cases.
+ */
+struct zap_details {
+ struct vm_area_struct *nonlinear_vma; /* Check page->index if set */
+ struct address_space *check_mapping; /* Check page->mapping if set */
+ pgoff_t first_index; /* Lowest page->index to unmap
*/
+ pgoff_t last_index; /* Highest page->index to unmap
*/
+ spinlock_t *i_mmap_lock; /* For unmap_mapping_range: */
+ unsigned long break_addr; /* Where unmap_vmas stopped */
+ unsigned long truncate_count; /* Compare vm_truncate_count */
+};
+
+void zap_page_range(struct vm_area_struct *vma, unsigned long address,
+ unsigned long size, struct zap_details *);
+int unmap_vmas(struct mmu_gather **tlbp, struct mm_struct *mm,
+ struct vm_area_struct *start_vma, unsigned long start_addr,
+ unsigned long end_addr, unsigned long *nr_accounted,
+ struct zap_details *);
+void clear_page_range(struct mmu_gather *tlb, unsigned long addr, unsigned
long end);
+int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
+ struct vm_area_struct *vma);
+int zeromap_page_range(struct vm_area_struct *vma, unsigned long from,
+ unsigned long size, pgprot_t prot);
+void unmap_mapping_range(struct address_space *mapping,
+ loff_t const holebegin, loff_t const holelen, int even_cows);
+
+static inline void unmap_shared_mapping_range(struct address_space *mapping,
+ loff_t const holebegin, loff_t const holelen)
+{
+ unmap_mapping_range(mapping, holebegin, holelen, 0);
+}
+
+extern int vmtruncate(struct inode * inode, loff_t offset);
+extern pud_t *FASTCALL(__pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned
long address));
+extern pmd_t *FASTCALL(__pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned
long address));
+extern pte_t *FASTCALL(pte_alloc_kernel(struct mm_struct *mm, pmd_t *pmd,
unsigned long address));
+extern pte_t *FASTCALL(pte_alloc_map(struct mm_struct *mm, pmd_t *pmd,
unsigned long address));
+extern int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, struct page *page, pgprot_t prot);
+extern int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, unsigned long pgoff, pgprot_t prot);
+extern int handle_mm_fault(struct mm_struct *mm,struct vm_area_struct *vma,
unsigned long address, int write_access);
+extern int make_pages_present(unsigned long addr, unsigned long end);
+extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void
*buf, int len, int write);
+void install_arg_page(struct vm_area_struct *, struct page *, unsigned long);
+
+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 __set_page_dirty_buffers(struct page *page);
+int __set_page_dirty_nobuffers(struct page *page);
+int redirty_page_for_writepage(struct writeback_control *wbc,
+ struct page *page);
+int FASTCALL(set_page_dirty(struct page *page));
+int set_page_dirty_lock(struct page *page);
+int clear_page_dirty_for_io(struct page *page);
+
+extern unsigned long do_mremap(unsigned long addr,
+ unsigned long old_len, unsigned long new_len,
+ unsigned long flags, unsigned long new_addr);
+
+/*
+ * Prototype to add a shrinker callback for ageable caches.
+ *
+ * These functions are passed a count `nr_to_scan' and a gfpmask. They should
+ * scan `nr_to_scan' objects, attempting to free them.
+ *
+ * The callback must the number of objects which remain in the cache.
+ *
+ * The callback will be passes nr_to_scan == 0 when the VM is querying the
+ * cache size, so a fastpath for that case is appropriate.
+ */
+typedef int (*shrinker_t)(int nr_to_scan, unsigned int gfp_mask);
+
+/*
+ * Add an aging callback. The int is the number of 'seeks' it takes
+ * to recreate one of the objects that these functions age.
+ */
+
+#define DEFAULT_SEEKS 2
+struct shrinker;
+extern struct shrinker *set_shrinker(int, shrinker_t);
+extern void remove_shrinker(struct shrinker *shrinker);
+
+/*
+ * On a two-level or three-level page table, this ends up being trivial. Thus
+ * the inlining and the symmetry break with pte_alloc_map() that does all
+ * of this out-of-line.
+ */
+/*
+ * The following ifdef needed to get the 4level-fixup.h header to work.
+ * Remove it when 4level-fixup.h has been removed.
+ */
+#ifdef CONFIG_MMU
+#ifndef __ARCH_HAS_4LEVEL_HACK
+static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long
address)
+{
+ if (pgd_none(*pgd))
+ return __pud_alloc(mm, pgd, address);
+ return pud_offset(pgd, address);
+}
+
+static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long
address)
+{
+ if (pud_none(*pud))
+ return __pmd_alloc(mm, pud, address);
+ return pmd_offset(pud, address);
+}
+#endif
+#endif /* CONFIG_MMU */
+
+extern void free_area_init(unsigned long * zones_size);
+extern void free_area_init_node(int nid, pg_data_t *pgdat,
+ unsigned long * zones_size, unsigned long zone_start_pfn,
+ unsigned long *zholes_size);
+extern void memmap_init_zone(unsigned long, int, unsigned long, unsigned long);
+extern void mem_init(void);
+extern void show_mem(void);
+extern void si_meminfo(struct sysinfo * val);
+extern void si_meminfo_node(struct sysinfo *val, int nid);
+
+/* prio_tree.c */
+void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old);
+void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *);
+void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *);
+struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma,
+ struct prio_tree_iter *iter);
+
+#define vma_prio_tree_foreach(vma, iter, root, begin, end) \
+ for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \
+ (vma = vma_prio_tree_next(vma, iter)); )
+
+static inline void vma_nonlinear_insert(struct vm_area_struct *vma,
+ struct list_head *list)
+{
+ vma->shared.vm_set.parent = NULL;
+ list_add_tail(&vma->shared.vm_set.list, list);
+}
+
+/* mmap.c */
+extern int __vm_enough_memory(long pages, int cap_sys_admin);
+extern void vma_adjust(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert);
+extern struct vm_area_struct *vma_merge(struct mm_struct *,
+ struct vm_area_struct *prev, unsigned long addr, unsigned long end,
+ unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t,
+ struct mempolicy *);
+extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *);
+extern int split_vma(struct mm_struct *,
+ struct vm_area_struct *, unsigned long addr, int new_below);
+extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *);
+extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *,
+ struct rb_node **, struct rb_node *);
+extern struct vm_area_struct *copy_vma(struct vm_area_struct **,
+ unsigned long addr, unsigned long len, pgoff_t pgoff);
+extern void exit_mmap(struct mm_struct *);
+
+extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned
long, unsigned long, unsigned long);
+
+extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
+ unsigned long len, unsigned long prot,
+ unsigned long flag, unsigned long pgoff);
+
+static inline unsigned long do_mmap(struct file *file, unsigned long addr,
+ unsigned long len, unsigned long prot,
+ unsigned long flag, unsigned long offset)
+{
+ unsigned long ret = -EINVAL;
+ if ((offset + PAGE_ALIGN(len)) < offset)
+ goto out;
+ if (!(offset & ~PAGE_MASK))
+ ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >>
PAGE_SHIFT);
+out:
+ return ret;
+}
+
+extern int do_munmap(struct mm_struct *, unsigned long, size_t);
+
+extern unsigned long do_brk(unsigned long, unsigned long);
+
+/* filemap.c */
+extern unsigned long page_unuse(struct page *);
+extern void truncate_inode_pages(struct address_space *, loff_t);
+
+/* generic vm_area_ops exported for stackable file systems */
+extern struct page *filemap_nopage(struct vm_area_struct *, unsigned long, int
*);
+extern int filemap_populate(struct vm_area_struct *, unsigned long,
+ unsigned long, pgprot_t, unsigned long, int);
+
+/* mm/page-writeback.c */
+int write_one_page(struct page *page, int wait);
+
+/* readahead.c */
+#define VM_MAX_READAHEAD 128 /* kbytes */
+#define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
+#define VM_MAX_CACHE_HIT 256 /* max pages in a row in cache before
+ * turning readahead off */
+
+int do_page_cache_readahead(struct address_space *mapping, struct file *filp,
+ unsigned long offset, unsigned long nr_to_read);
+int force_page_cache_readahead(struct address_space *mapping, struct file
*filp,
+ unsigned long offset, unsigned long nr_to_read);
+unsigned long page_cache_readahead(struct address_space *mapping,
+ struct file_ra_state *ra,
+ struct file *filp,
+ unsigned long offset,
+ unsigned long size);
+void handle_ra_miss(struct address_space *mapping,
+ struct file_ra_state *ra, pgoff_t offset);
+unsigned long max_sane_readahead(unsigned long nr);
+
+/* Do stack extension */
+extern int expand_stack(struct vm_area_struct * vma, unsigned long address);
+
+/* Look up the first VMA which satisfies addr < vm_end, NULL if none. */
+extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long
addr);
+extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned
long addr,
+ struct vm_area_struct **pprev);
+
+/* Look up the first VMA which intersects the interval start_addr..end_addr-1,
+ NULL if none. Assume start_addr < end_addr. */
+static inline struct vm_area_struct * find_vma_intersection(struct mm_struct *
mm, unsigned long start_addr, unsigned long end_addr)
+{
+ struct vm_area_struct * vma = find_vma(mm,start_addr);
+
+ if (vma && end_addr <= vma->vm_start)
+ vma = NULL;
+ return vma;
+}
+
+static inline unsigned long vma_pages(struct vm_area_struct *vma)
+{
+ return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+}
+
+extern struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned
long addr);
+
+extern struct page * vmalloc_to_page(void *addr);
+extern unsigned long vmalloc_to_pfn(void *addr);
+extern struct page * follow_page(struct mm_struct *mm, unsigned long address,
+ int write);
+extern int check_user_page_readable(struct mm_struct *mm, unsigned long
address);
+int remap_pfn_range(struct vm_area_struct *, unsigned long,
+ unsigned long, unsigned long, pgprot_t);
+/* Allow arch override for mapping of device and I/O (non-RAM) pages. */
+#ifndef io_remap_pfn_range
+#define io_remap_pfn_range remap_pfn_range
+#endif
+
+#ifdef CONFIG_PROC_FS
+void __vm_stat_account(struct mm_struct *, unsigned long, struct file *, long);
+#else
+static inline void __vm_stat_account(struct mm_struct *mm,
+ unsigned long flags, struct file *file, long pages)
+{
+}
+#endif /* CONFIG_PROC_FS */
+
+static inline void vm_stat_account(struct vm_area_struct *vma)
+{
+ __vm_stat_account(vma->vm_mm, vma->vm_flags, vma->vm_file,
+ vma_pages(vma));
+}
+
+static inline void vm_stat_unaccount(struct vm_area_struct *vma)
+{
+ __vm_stat_account(vma->vm_mm, vma->vm_flags, vma->vm_file,
+ -vma_pages(vma));
+}
+
+/* update per process rss and vm hiwater data */
+extern void update_mem_hiwater(void);
+
+#ifndef CONFIG_DEBUG_PAGEALLOC
+static inline void
+kernel_map_pages(struct page *page, int numpages, int enable)
+{
+}
+#endif
+
+extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk);
+#ifdef __HAVE_ARCH_GATE_AREA
+int in_gate_area_no_task(unsigned long addr);
+int in_gate_area(struct task_struct *task, unsigned long addr);
+#else
+int in_gate_area_no_task(unsigned long addr);
+#define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);})
+#endif /* __HAVE_ARCH_GATE_AREA */
+
+#endif /* __KERNEL__ */
+#endif /* _LINUX_MM_H */
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