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
26 static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
27 int type,
28 u32 slot);
29
30 #ifdef CONFIG_DEBUG_LOCK_ALLOC
31 static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES];
32 #endif
33
34 static 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
40 static 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
88 struct 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
123 static 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
163 bail:
164
165 return inode;
166 }
167
168
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.