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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// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * sysfile.c
4 *
5 * Initialize, read, write, etc. system files.
6 *
7 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
8 */
9
10#include <linux/fs.h>
11#include <linux/types.h>
12#include <linux/highmem.h>
13
14#include <cluster/masklog.h>
15
16#include "ocfs2.h"
17
18#include "alloc.h"
19#include "dir.h"
20#include "inode.h"
21#include "journal.h"
22#include "sysfile.h"
23
24#include "buffer_head_io.h"
25
26static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
27 int type,
28 u32 slot);
29
30#ifdef CONFIG_DEBUG_LOCK_ALLOC
31static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES];
32#endif
33
34static inline int is_global_system_inode(int type)
35{
36 return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE &&
37 type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE;
38}
39
40static struct inode **get_local_system_inode(struct ocfs2_super *osb,
41 int type,
42 u32 slot)
43{
44 int index;
45 struct inode **local_system_inodes, **free = NULL;
46
47 BUG_ON(slot == OCFS2_INVALID_SLOT);
48 BUG_ON(type < OCFS2_FIRST_LOCAL_SYSTEM_INODE ||
49 type > OCFS2_LAST_LOCAL_SYSTEM_INODE);
50
51 spin_lock(&osb->osb_lock);
52 local_system_inodes = osb->local_system_inodes;
53 spin_unlock(&osb->osb_lock);
54
55 if (unlikely(!local_system_inodes)) {
56 local_system_inodes =
57 kzalloc(array3_size(sizeof(struct inode *),
58 NUM_LOCAL_SYSTEM_INODES,
59 osb->max_slots),
60 GFP_NOFS);
61 if (!local_system_inodes) {
62 mlog_errno(-ENOMEM);
63 /*
64 * return NULL here so that ocfs2_get_sytem_file_inodes
65 * will try to create an inode and use it. We will try
66 * to initialize local_system_inodes next time.
67 */
68 return NULL;
69 }
70
71 spin_lock(&osb->osb_lock);
72 if (osb->local_system_inodes) {
73 /* Someone has initialized it for us. */
74 free = local_system_inodes;
75 local_system_inodes = osb->local_system_inodes;
76 } else
77 osb->local_system_inodes = local_system_inodes;
78 spin_unlock(&osb->osb_lock);
79 kfree(free);
80 }
81
82 index = (slot * NUM_LOCAL_SYSTEM_INODES) +
83 (type - OCFS2_FIRST_LOCAL_SYSTEM_INODE);
84
85 return &local_system_inodes[index];
86}
87
88struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb,
89 int type,
90 u32 slot)
91{
92 struct inode *inode = NULL;
93 struct inode **arr = NULL;
94
95 /* avoid the lookup if cached in local system file array */
96 if (is_global_system_inode(type)) {
97 arr = &(osb->global_system_inodes[type]);
98 } else
99 arr = get_local_system_inode(osb, type, slot);
100
101 mutex_lock(&osb->system_file_mutex);
102 if (arr && ((inode = *arr) != NULL)) {
103 /* get a ref in addition to the array ref */
104 inode = igrab(inode);
105 mutex_unlock(&osb->system_file_mutex);
106 BUG_ON(!inode);
107
108 return inode;
109 }
110
111 /* this gets one ref thru iget */
112 inode = _ocfs2_get_system_file_inode(osb, type, slot);
113
114 /* add one more if putting into array for first time */
115 if (arr && inode) {
116 *arr = igrab(inode);
117 BUG_ON(!*arr);
118 }
119 mutex_unlock(&osb->system_file_mutex);
120 return inode;
121}
122
123static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
124 int type,
125 u32 slot)
126{
127 char namebuf[40];
128 struct inode *inode = NULL;
129 u64 blkno;
130 int status = 0;
131
132 ocfs2_sprintf_system_inode_name(namebuf,
133 sizeof(namebuf),
134 type, slot);
135
136 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
137 strlen(namebuf), &blkno);
138 if (status < 0) {
139 goto bail;
140 }
141
142 inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type);
143 if (IS_ERR(inode)) {
144 mlog_errno(PTR_ERR(inode));
145 inode = NULL;
146 goto bail;
147 }
148#ifdef CONFIG_DEBUG_LOCK_ALLOC
149 if (type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
150 type == LOCAL_GROUP_QUOTA_SYSTEM_INODE ||
151 type == JOURNAL_SYSTEM_INODE) {
152 /* Ignore inode lock on these inodes as the lock does not
153 * really belong to any process and lockdep cannot handle
154 * that */
155 OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL;
156 } else {
157 lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres.
158 l_lockdep_map,
159 ocfs2_system_inodes[type].si_name,
160 &ocfs2_sysfile_cluster_lock_key[type], 0);
161 }
162#endif
163bail:
164
165 return inode;
166}
167