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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * mm/fadvise.c
3 *
4 * Copyright (C) 2002, Linus Torvalds
5 *
Francois Camie1f8e872008-10-15 22:01:59 -07006 * 11Jan2003 Andrew Morton
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Initial version.
8 */
9
10#include <linux/kernel.h>
11#include <linux/file.h>
12#include <linux/fs.h>
13#include <linux/mm.h>
14#include <linux/pagemap.h>
15#include <linux/backing-dev.h>
16#include <linux/pagevec.h>
17#include <linux/fadvise.h>
Andrew Mortonebcf28e2006-03-24 03:18:04 -080018#include <linux/writeback.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/syscalls.h>
20
21#include <asm/unistd.h>
22
23/*
24 * POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could
25 * deactivate the pages and clear PG_Referenced.
26 */
Heiko Carstens6673e0c2009-01-14 14:14:02 +010027SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
Linus Torvalds1da177e2005-04-16 15:20:36 -070028{
Al Viro61144372012-08-26 20:27:09 -040029 int fput_needed;
30 struct file *file = fget_light(fd, &fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 struct address_space *mapping;
32 struct backing_dev_info *bdi;
Andrew Mortonebcf28e2006-03-24 03:18:04 -080033 loff_t endbyte; /* inclusive */
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 pgoff_t start_index;
35 pgoff_t end_index;
36 unsigned long nrpages;
37 int ret = 0;
38
39 if (!file)
40 return -EBADF;
41
Josef "Jeff" Sipekd3ac7f82006-12-08 02:36:44 -080042 if (S_ISFIFO(file->f_path.dentry->d_inode->i_mode)) {
Valentine Barshak87ba81d2006-01-08 01:03:44 -080043 ret = -ESPIPE;
44 goto out;
45 }
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 mapping = file->f_mapping;
48 if (!mapping || len < 0) {
49 ret = -EINVAL;
50 goto out;
51 }
52
Nick Piggin70688e42008-04-28 02:13:02 -070053 if (mapping->a_ops->get_xip_mem) {
Masatake YAMATOb5beb1c2008-02-04 22:29:31 -080054 switch (advice) {
55 case POSIX_FADV_NORMAL:
56 case POSIX_FADV_RANDOM:
57 case POSIX_FADV_SEQUENTIAL:
58 case POSIX_FADV_WILLNEED:
59 case POSIX_FADV_NOREUSE:
60 case POSIX_FADV_DONTNEED:
61 /* no bad return value, but ignore advice */
62 break;
63 default:
64 ret = -EINVAL;
65 }
Carsten Ottefe77ba62005-06-23 22:05:29 -070066 goto out;
Masatake YAMATOb5beb1c2008-02-04 22:29:31 -080067 }
Carsten Ottefe77ba62005-06-23 22:05:29 -070068
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 /* Careful about overflows. Len == 0 means "as much as possible" */
70 endbyte = offset + len;
71 if (!len || endbyte < len)
72 endbyte = -1;
Andrew Mortonebcf28e2006-03-24 03:18:04 -080073 else
74 endbyte--; /* inclusive */
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76 bdi = mapping->backing_dev_info;
77
78 switch (advice) {
79 case POSIX_FADV_NORMAL:
80 file->f_ra.ra_pages = bdi->ra_pages;
Wu Fengguang01414502010-03-05 13:42:03 -080081 spin_lock(&file->f_lock);
82 file->f_mode &= ~FMODE_RANDOM;
83 spin_unlock(&file->f_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 break;
85 case POSIX_FADV_RANDOM:
Wu Fengguang01414502010-03-05 13:42:03 -080086 spin_lock(&file->f_lock);
87 file->f_mode |= FMODE_RANDOM;
88 spin_unlock(&file->f_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 break;
90 case POSIX_FADV_SEQUENTIAL:
91 file->f_ra.ra_pages = bdi->ra_pages * 2;
Wu Fengguang01414502010-03-05 13:42:03 -080092 spin_lock(&file->f_lock);
93 file->f_mode &= ~FMODE_RANDOM;
94 spin_unlock(&file->f_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 break;
96 case POSIX_FADV_WILLNEED:
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 /* First and last PARTIAL page! */
98 start_index = offset >> PAGE_CACHE_SHIFT;
Andrew Mortonebcf28e2006-03-24 03:18:04 -080099 end_index = endbyte >> PAGE_CACHE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 /* Careful about overflow on the "+1" */
102 nrpages = end_index - start_index + 1;
103 if (!nrpages)
104 nrpages = ~0UL;
KOSAKI Motohiro3d3727c2012-07-31 16:42:50 -0700105
106 /*
107 * Ignore return value because fadvise() shall return
108 * success even if filesystem can't retrieve a hint,
109 */
110 force_page_cache_readahead(mapping, file, start_index,
111 nrpages);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 break;
Andrew Morton60c371b2006-08-05 12:14:25 -0700113 case POSIX_FADV_NOREUSE:
114 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 case POSIX_FADV_DONTNEED:
116 if (!bdi_write_congested(mapping->backing_dev_info))
Shawn Bohrerad8a1b52012-01-10 15:07:35 -0800117 __filemap_fdatawrite_range(mapping, offset, endbyte,
118 WB_SYNC_NONE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
120 /* First and last FULL page! */
Andrew Mortonebcf28e2006-03-24 03:18:04 -0800121 start_index = (offset+(PAGE_CACHE_SIZE-1)) >> PAGE_CACHE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 end_index = (endbyte >> PAGE_CACHE_SHIFT);
123
Andrew Mortonebcf28e2006-03-24 03:18:04 -0800124 if (end_index >= start_index)
125 invalidate_mapping_pages(mapping, start_index,
126 end_index);
127 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 default:
129 ret = -EINVAL;
130 }
131out:
Al Viro61144372012-08-26 20:27:09 -0400132 fput_light(file, fput_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 return ret;
134}
Heiko Carstens6673e0c2009-01-14 14:14:02 +0100135#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
136asmlinkage long SyS_fadvise64_64(long fd, loff_t offset, loff_t len, long advice)
137{
138 return SYSC_fadvise64_64((int) fd, offset, len, (int) advice);
139}
140SYSCALL_ALIAS(sys_fadvise64_64, SyS_fadvise64_64);
141#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143#ifdef __ARCH_WANT_SYS_FADVISE64
144
Heiko Carstens6673e0c2009-01-14 14:14:02 +0100145SYSCALL_DEFINE(fadvise64)(int fd, loff_t offset, size_t len, int advice)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146{
147 return sys_fadvise64_64(fd, offset, len, advice);
148}
Heiko Carstens6673e0c2009-01-14 14:14:02 +0100149#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
150asmlinkage long SyS_fadvise64(long fd, loff_t offset, long len, long advice)
151{
152 return SYSC_fadvise64((int) fd, offset, (size_t)len, (int)advice);
153}
154SYSCALL_ALIAS(sys_fadvise64, SyS_fadvise64);
155#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
157#endif