ext3: tighten restrictions on inode flags
[deliverable/linux.git] / fs / aio.c
CommitLineData
1da177e4
LT
1/*
2 * An async IO implementation for Linux
3 * Written by Benjamin LaHaise <bcrl@kvack.org>
4 *
5 * Implements an efficient asynchronous io interface.
6 *
7 * Copyright 2000, 2001, 2002 Red Hat, Inc. All Rights Reserved.
8 *
9 * See ../COPYING for licensing terms.
10 */
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/errno.h>
14#include <linux/time.h>
15#include <linux/aio_abi.h>
16#include <linux/module.h>
17#include <linux/syscalls.h>
027445c3 18#include <linux/uio.h>
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19
20#define DEBUG 0
21
22#include <linux/sched.h>
23#include <linux/fs.h>
24#include <linux/file.h>
25#include <linux/mm.h>
26#include <linux/mman.h>
27#include <linux/slab.h>
28#include <linux/timer.h>
29#include <linux/aio.h>
30#include <linux/highmem.h>
31#include <linux/workqueue.h>
32#include <linux/security.h>
9c3060be 33#include <linux/eventfd.h>
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LT
34
35#include <asm/kmap_types.h>
36#include <asm/uaccess.h>
37#include <asm/mmu_context.h>
38
39#if DEBUG > 1
40#define dprintk printk
41#else
42#define dprintk(x...) do { ; } while (0)
43#endif
44
1da177e4 45/*------ sysctl variables----*/
d55b5fda
ZB
46static DEFINE_SPINLOCK(aio_nr_lock);
47unsigned long aio_nr; /* current system wide number of aio requests */
48unsigned long aio_max_nr = 0x10000; /* system wide maximum number of aio requests */
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49/*----end sysctl variables---*/
50
e18b890b
CL
51static struct kmem_cache *kiocb_cachep;
52static struct kmem_cache *kioctx_cachep;
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53
54static struct workqueue_struct *aio_wq;
55
56/* Used for rare fput completion. */
65f27f38
DH
57static void aio_fput_routine(struct work_struct *);
58static DECLARE_WORK(fput_work, aio_fput_routine);
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LT
59
60static DEFINE_SPINLOCK(fput_lock);
25ee7e38 61static LIST_HEAD(fput_head);
1da177e4 62
65f27f38 63static void aio_kick_handler(struct work_struct *);