linux-imx

/*

 *  linux/mm/filemap.c

 *

 * Copyright (C) 1994-1999  Linus Torvalds

 */

​

/*

 * This file handles the generic file mmap semantics used by

 * most "normal" filesystems (but you don't /have/ to use this:

 * the NFS filesystem used to do this differently, for example)

 */

#include <linux/export.h>

#include <linux/compiler.h>

#include <linux/dax.h>

#include <linux/fs.h>

#include <linux/sched/signal.h>

#include <linux/uaccess.h>

#include <linux/capability.h>

#include <linux/kernel_stat.h>

#include <linux/gfp.h>

#include <linux/mm.h>

#include <linux/swap.h>

#include <linux/mman.h>

#include <linux/pagemap.h>

#include <linux/file.h>

#include <linux/uio.h>

#include <linux/hash.h>

#include <linux/writeback.h>

#include <linux/backing-dev.h>

#include <linux/pagevec.h>

#include <linux/blkdev.h>

#include <linux/security.h>

#include <linux/cpuset.h>

#include <linux/hugetlb.h>

#include <linux/memcontrol.h>

#include <linux/cleancache.h>

#include <linux/shmem_fs.h>

#include <linux/rmap.h>

#include <linux/delayacct.h>

#include <linux/psi.h>

#include "internal.h"

​

#define CREATE_TRACE_POINTS

#include <trace/events/filemap.h>

​

/*

 * FIXME: remove all knowledge of the buffer layer from the core VM

 */

#include <linux/buffer_head.h> /* for try_to_free_buffers */

​

#include <asm/mman.h>

​

/*

 * Shared mappings implemented 30.11.1994. It's not fully working yet,

 * though.

 *

 * Shared mappings now work. 15.8.1995  Bruno.

 *

 * finished 'unifying' the page and buffer cache and SMP-threaded the

 * page-cache, 21.05.1999, Ingo Molnar <mingo@redhat.com>

 *

 * SMP-threaded pagemap-LRU 1999, Andrea Arcangeli <andrea@suse.de>

 */

​

/*

 * Lock ordering:

 *

 *  ->i_mmap_rwsem      (truncate_pagecache)

 *    ->private_lock        (__free_pte->__set_page_dirty_buffers)

 *      ->swap_lock     (exclusive_swap_page, others)

 *        ->i_pages lock

 *

 *  ->i_mutex

 *    ->i_mmap_rwsem        (truncate->unmap_mapping_range)

 *

 *  ->mmap_sem

 *    ->i_mmap_rwsem

 *      ->page_table_lock or pte_lock   (various, mainly in memory.c)

 *        ->i_pages lock    (arch-dependent flush_dcache_mmap_lock)

 *

 *  ->mmap_sem

 *    ->lock_page       (access_process_vm)

 *

 *  ->i_mutex           (generic_perform_write)

 *    ->mmap_sem        (fault_in_pages_readable->do_page_fault)

 *

 *  bdi->wb.list_lock

 *    sb_lock           (fs/fs-writeback.c)

 *    ->i_pages lock        (__sync_single_inode)

 *

 *  ->i_mmap_rwsem

 *    ->anon_vma.lock       (vma_adjust)