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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * sysfile.c
6 *
7 * Initialize, read, write, etc. system files.
8 *
9 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
10 */
11
12#include <linux/fs.h>
13#include <linux/types.h>
14#include <linux/highmem.h>
15
16#include <cluster/masklog.h>
17
18#include "ocfs2.h"
19
20#include "alloc.h"
21#include "dir.h"
22#include "inode.h"
23#include "journal.h"
24#include "sysfile.h"
25
26#include "buffer_head_io.h"
27
28static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
29 int type,
30 u32 slot);
31
32#ifdef CONFIG_DEBUG_LOCK_ALLOC
33static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES];
34#endif
35
36static inline int is_global_system_inode(int type)
37{
38 return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE &&
39 type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE;
40}
41
42static struct inode **get_local_system_inode(struct ocfs2_super *osb,
43 int type,
44 u32 slot)
45{
46 int index;
47 struct inode **local_system_inodes, **free = NULL;
48
49 BUG_ON(slot == OCFS2_INVALID_SLOT);
50 BUG_ON(type < OCFS2_FIRST_LOCAL_SYSTEM_INODE ||
51 type > OCFS2_LAST_LOCAL_SYSTEM_INODE);
52
53 spin_lock(&osb->osb_lock);
54 local_system_inodes = osb->local_system_inodes;
55 spin_unlock(&osb->osb_lock);
56
57 if (unlikely(!local_system_inodes)) {
58 local_system_inodes =
59 kzalloc(array3_size(sizeof(struct inode *),
60 NUM_LOCAL_SYSTEM_INODES,
61 osb->max_slots),
62 GFP_NOFS);
63 if (!local_system_inodes) {
64 mlog_errno(-ENOMEM);
65 /*
66 * return NULL here so that ocfs2_get_sytem_file_inodes
67 * will try to create an inode and use it. We will try
68 * to initialize local_system_inodes next time.
69 */
70 return NULL;
71 }
72
73 spin_lock(&osb->osb_lock);
74 if (osb->local_system_inodes) {
75 /* Someone has initialized it for us. */
76 free = local_system_inodes;
77 local_system_inodes = osb->local_system_inodes;
78 } else
79 osb->local_system_inodes = local_system_inodes;
80 spin_unlock(&osb->osb_lock);
81 kfree(free);
82 }
83
84 index = (slot * NUM_LOCAL_SYSTEM_INODES) +
85 (type - OCFS2_FIRST_LOCAL_SYSTEM_INODE);
86
87 return &local_system_inodes[index];
88}
89
90struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb,
91 int type,
92 u32 slot)
93{
94 struct inode *inode = NULL;
95 struct inode **arr = NULL;
96
97 /* avoid the lookup if cached in local system file array */
98 if (is_global_system_inode(type)) {
99 arr = &(osb->global_system_inodes[type]);
100 } else
101 arr = get_local_system_inode(osb, type, slot);
102
103 mutex_lock(&osb->system_file_mutex);
104 if (arr && ((inode = *arr) != NULL)) {
105 /* get a ref in addition to the array ref */
106 inode = igrab(inode);
107 mutex_unlock(&osb->system_file_mutex);
108 BUG_ON(!inode);
109
110 return inode;
111 }
112
113 /* this gets one ref thru iget */
114 inode = _ocfs2_get_system_file_inode(osb, type, slot);
115
116 /* add one more if putting into array for first time */
117 if (arr && inode) {
118 *arr = igrab(inode);
119 BUG_ON(!*arr);
120 }
121 mutex_unlock(&osb->system_file_mutex);
122 return inode;
123}
124
125static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
126 int type,
127 u32 slot)
128{
129 char namebuf[40];
130 struct inode *inode = NULL;
131 u64 blkno;
132 int status = 0;
133
134 ocfs2_sprintf_system_inode_name(namebuf,
135 sizeof(namebuf),
136 type, slot);
137
138 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
139 strlen(namebuf), &blkno);
140 if (status < 0) {
141 goto bail;
142 }
143
144 inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type);
145 if (IS_ERR(inode)) {
146 mlog_errno(PTR_ERR(inode));
147 inode = NULL;
148 goto bail;
149 }
150#ifdef CONFIG_DEBUG_LOCK_ALLOC
151 if (type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
152 type == LOCAL_GROUP_QUOTA_SYSTEM_INODE ||
153 type == JOURNAL_SYSTEM_INODE) {
154 /* Ignore inode lock on these inodes as the lock does not
155 * really belong to any process and lockdep cannot handle
156 * that */
157 OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL;
158 } else {
159 lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres.
160 l_lockdep_map,
161 ocfs2_system_inodes[type].si_name,
162 &ocfs2_sysfile_cluster_lock_key[type], 0);
163 }
164#endif
165bail:
166
167 return inode;
168}
169
1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * sysfile.c
5 *
6 * Initialize, read, write, etc. system files.
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26#include <linux/fs.h>
27#include <linux/types.h>
28#include <linux/highmem.h>
29
30#include <cluster/masklog.h>
31
32#include "ocfs2.h"
33
34#include "alloc.h"
35#include "dir.h"
36#include "inode.h"
37#include "journal.h"
38#include "sysfile.h"
39
40#include "buffer_head_io.h"
41
42static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
43 int type,
44 u32 slot);
45
46#ifdef CONFIG_DEBUG_LOCK_ALLOC
47static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES];
48#endif
49
50static inline int is_global_system_inode(int type)
51{
52 return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE &&
53 type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE;
54}
55
56static struct inode **get_local_system_inode(struct ocfs2_super *osb,
57 int type,
58 u32 slot)
59{
60 int index;
61 struct inode **local_system_inodes, **free = NULL;
62
63 BUG_ON(slot == OCFS2_INVALID_SLOT);
64 BUG_ON(type < OCFS2_FIRST_LOCAL_SYSTEM_INODE ||
65 type > OCFS2_LAST_LOCAL_SYSTEM_INODE);
66
67 spin_lock(&osb->osb_lock);
68 local_system_inodes = osb->local_system_inodes;
69 spin_unlock(&osb->osb_lock);
70
71 if (unlikely(!local_system_inodes)) {
72 local_system_inodes = kzalloc(sizeof(struct inode *) *
73 NUM_LOCAL_SYSTEM_INODES *
74 osb->max_slots,
75 GFP_NOFS);
76 if (!local_system_inodes) {
77 mlog_errno(-ENOMEM);
78 /*
79 * return NULL here so that ocfs2_get_sytem_file_inodes
80 * will try to create an inode and use it. We will try
81 * to initialize local_system_inodes next time.
82 */
83 return NULL;
84 }
85
86 spin_lock(&osb->osb_lock);
87 if (osb->local_system_inodes) {
88 /* Someone has initialized it for us. */
89 free = local_system_inodes;
90 local_system_inodes = osb->local_system_inodes;
91 } else
92 osb->local_system_inodes = local_system_inodes;
93 spin_unlock(&osb->osb_lock);
94 kfree(free);
95 }
96
97 index = (slot * NUM_LOCAL_SYSTEM_INODES) +
98 (type - OCFS2_FIRST_LOCAL_SYSTEM_INODE);
99
100 return &local_system_inodes[index];
101}
102
103struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb,
104 int type,
105 u32 slot)
106{
107 struct inode *inode = NULL;
108 struct inode **arr = NULL;
109
110 /* avoid the lookup if cached in local system file array */
111 if (is_global_system_inode(type)) {
112 arr = &(osb->global_system_inodes[type]);
113 } else
114 arr = get_local_system_inode(osb, type, slot);
115
116 mutex_lock(&osb->system_file_mutex);
117 if (arr && ((inode = *arr) != NULL)) {
118 /* get a ref in addition to the array ref */
119 inode = igrab(inode);
120 mutex_unlock(&osb->system_file_mutex);
121 BUG_ON(!inode);
122
123 return inode;
124 }
125
126 /* this gets one ref thru iget */
127 inode = _ocfs2_get_system_file_inode(osb, type, slot);
128
129 /* add one more if putting into array for first time */
130 if (arr && inode) {
131 *arr = igrab(inode);
132 BUG_ON(!*arr);
133 }
134 mutex_unlock(&osb->system_file_mutex);
135 return inode;
136}
137
138static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
139 int type,
140 u32 slot)
141{
142 char namebuf[40];
143 struct inode *inode = NULL;
144 u64 blkno;
145 int status = 0;
146
147 ocfs2_sprintf_system_inode_name(namebuf,
148 sizeof(namebuf),
149 type, slot);
150
151 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
152 strlen(namebuf), &blkno);
153 if (status < 0) {
154 goto bail;
155 }
156
157 inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type);
158 if (IS_ERR(inode)) {
159 mlog_errno(PTR_ERR(inode));
160 inode = NULL;
161 goto bail;
162 }
163#ifdef CONFIG_DEBUG_LOCK_ALLOC
164 if (type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
165 type == LOCAL_GROUP_QUOTA_SYSTEM_INODE ||
166 type == JOURNAL_SYSTEM_INODE) {
167 /* Ignore inode lock on these inodes as the lock does not
168 * really belong to any process and lockdep cannot handle
169 * that */
170 OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL;
171 } else {
172 lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres.
173 l_lockdep_map,
174 ocfs2_system_inodes[type].si_name,
175 &ocfs2_sysfile_cluster_lock_key[type], 0);
176 }
177#endif
178bail:
179
180 return inode;
181}
182