1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License v.2.
*/
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/gfs2_ondisk.h>
#include "gfs2.h"
#include "lm_interface.h"
#include "incore.h"
#include "bmap.h"
#include "glock.h"
#include "inode.h"
#include "ops_vm.h"
#include "page.h"
#include "quota.h"
#include "rgrp.h"
#include "trans.h"
#include "util.h"
static void pfault_be_greedy(struct gfs2_inode *ip)
{
unsigned int time;
spin_lock(&ip->i_spin);
time = ip->i_greedy;
ip->i_last_pfault = jiffies;
spin_unlock(&ip->i_spin);
gfs2_inode_hold(ip);
if (gfs2_glock_be_greedy(ip->i_gl, time))
gfs2_inode_put(ip);
}
static struct page *gfs2_private_nopage(struct vm_area_struct *area,
unsigned long address, int *type)
{
struct gfs2_inode *ip = area->vm_file->f_mapping->host->u.generic_ip;
struct gfs2_holder i_gh;
struct page *result;
int error;
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
if (error)
return NULL;
set_bit(GIF_PAGED, &ip->i_flags);
result = filemap_nopage(area, address, type);
if (result && result != NOPAGE_OOM)
pfault_be_greedy(ip);
gfs2_glock_dq_uninit(&i_gh);
return result;
}
static int alloc_page_backing(struct gfs2_inode *ip, struct page *page)
{
struct gfs2_sbd *sdp = ip->i_sbd;
unsigned long index = page->index;
uint64_t lblock = index << (PAGE_CACHE_SHIFT -
sdp->sd_sb.sb_bsize_shift);
unsigned int blocks = PAGE_CACHE_SIZE >> sdp->sd_sb.sb_bsize_shift;
struct gfs2_alloc *al;
unsigned int data_blocks, ind_blocks;
unsigned int x;
int error;
al = gfs2_alloc_get(ip);
error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
goto out;
error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid);
if (error)
goto out_gunlock_q;
gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
al->al_requested = data_blocks + ind_blocks;
error = gfs2_inplace_reserve(ip);
if (error)
goto out_gunlock_q;
error = gfs2_trans_begin(sdp, al->al_rgd->rd_ri.ri_length +
ind_blocks + RES_DINODE +
RES_STATFS + RES_QUOTA, 0);
if (error)
goto out_ipres;
if (gfs2_is_stuffed(ip)) {
error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page, NULL);
if (error)
goto out_trans;
}
for (x = 0; x < blocks; ) {
uint64_t dblock;
unsigned int extlen;
int new = 1;
error = gfs2_extent_map(ip->i_vnode, lblock, &new, &dblock, &extlen);
if (error)
goto out_trans;
lblock += extlen;
x += extlen;
}
gfs2_assert_warn(sdp, al->al_alloced);
out_trans:
gfs2_trans_end(sdp);
out_ipres:
gfs2_inplace_release(ip);
out_gunlock_q:
gfs2_quota_unlock(ip);
out:
gfs2_alloc_put(ip);
return error;
}
static struct page *gfs2_sharewrite_nopage(struct vm_area_struct *area,
unsigned long address, int *type)
{
struct gfs2_inode *ip = area->vm_file->f_mapping->host->u.generic_ip;
struct gfs2_holder i_gh;
struct page *result = NULL;
unsigned long index = ((address - area->vm_start) >> PAGE_CACHE_SHIFT) +
area->vm_pgoff;
int alloc_required;
int error;
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
if (error)
return NULL;
set_bit(GIF_PAGED, &ip->i_flags);
set_bit(GIF_SW_PAGED, &ip->i_flags);
error = gfs2_write_alloc_required(ip,
(uint64_t)index << PAGE_CACHE_SHIFT,
PAGE_CACHE_SIZE, &alloc_required);
if (error)
goto out;
result = filemap_nopage(area, address, type);
if (!result || result == NOPAGE_OOM)
goto out;
if (alloc_required) {
error = alloc_page_backing(ip, result);
if (error) {
page_cache_release(result);
result = NULL;
goto out;
}
set_page_dirty(result);
}
pfault_be_greedy(ip);
out:
gfs2_glock_dq_uninit(&i_gh);
return result;
}
struct vm_operations_struct gfs2_vm_ops_private = {
.nopage = gfs2_private_nopage,
};
struct vm_operations_struct gfs2_vm_ops_sharewrite = {
.nopage = gfs2_sharewrite_nopage,
};
|
