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ccd979bd MF |
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> | |
ccd979bd MF |
28 | #include <linux/highmem.h> |
29 | ||
ccd979bd MF |
30 | #define MLOG_MASK_PREFIX ML_INODE |
31 | #include <cluster/masklog.h> | |
32 | ||
80c05846 MF |
33 | #include "ocfs2.h" |
34 | ||
ccd979bd MF |
35 | #include "alloc.h" |
36 | #include "dir.h" | |
37 | #include "inode.h" | |
38 | #include "journal.h" | |
39 | #include "sysfile.h" | |
40 | ||
41 | #include "buffer_head_io.h" | |
42 | ||
43 | static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, | |
44 | int type, | |
45 | u32 slot); | |
46 | ||
d246ab30 | 47 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
cb25797d | 48 | static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES]; |
d246ab30 | 49 | #endif |
cb25797d | 50 | |
ccd979bd MF |
51 | static inline int is_global_system_inode(int type) |
52 | { | |
53 | return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE && | |
54 | type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; | |
55 | } | |
56 | ||
b4d693fc TM |
57 | static struct inode **get_local_system_inode(struct ocfs2_super *osb, |
58 | int type, | |
59 | u32 slot) | |
ccd979bd | 60 | { |
b4d693fc TM |
61 | int index; |
62 | struct inode **local_system_inodes, **free = NULL; | |
63 | ||
64 | BUG_ON(slot == OCFS2_INVALID_SLOT); | |
65 | BUG_ON(type < OCFS2_FIRST_LOCAL_SYSTEM_INODE || | |
66 | type > OCFS2_LAST_LOCAL_SYSTEM_INODE); | |
67 | ||
68 | spin_lock(&osb->osb_lock); | |
69 | local_system_inodes = osb->local_system_inodes; | |
70 | spin_unlock(&osb->osb_lock); | |
71 | ||
72 | if (unlikely(!local_system_inodes)) { | |
73 | local_system_inodes = kzalloc(sizeof(struct inode *) * | |
74 | NUM_LOCAL_SYSTEM_INODES * | |
75 | osb->max_slots, | |
76 | GFP_NOFS); | |
77 | if (!local_system_inodes) { | |
78 | mlog_errno(-ENOMEM); | |
79 | /* | |
80 | * return NULL here so that ocfs2_get_sytem_file_inodes | |
81 | * will try to create an inode and use it. We will try | |
82 | * to initialize local_system_inodes next time. | |
83 | */ | |
84 | return NULL; | |
85 | } | |
86 | ||
87 | spin_lock(&osb->osb_lock); | |
88 | if (osb->local_system_inodes) { | |
89 | /* Someone has initialized it for us. */ | |
90 | free = local_system_inodes; | |
91 | local_system_inodes = osb->local_system_inodes; | |
92 | } else | |
93 | osb->local_system_inodes = local_system_inodes; | |
94 | spin_unlock(&osb->osb_lock); | |
95 | if (unlikely(free)) | |
96 | kfree(free); | |
97 | } | |
98 | ||
99 | index = (slot * NUM_LOCAL_SYSTEM_INODES) + | |
100 | (type - OCFS2_FIRST_LOCAL_SYSTEM_INODE); | |
101 | ||
102 | return &local_system_inodes[index]; | |
ccd979bd MF |
103 | } |
104 | ||
105 | struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb, | |
106 | int type, | |
107 | u32 slot) | |
108 | { | |
109 | struct inode *inode = NULL; | |
110 | struct inode **arr = NULL; | |
111 | ||
112 | /* avoid the lookup if cached in local system file array */ | |
b4d693fc TM |
113 | if (is_global_system_inode(type)) { |
114 | arr = &(osb->global_system_inodes[type]); | |
115 | } else | |
116 | arr = get_local_system_inode(osb, type, slot); | |
ccd979bd MF |
117 | |
118 | if (arr && ((inode = *arr) != NULL)) { | |
119 | /* get a ref in addition to the array ref */ | |
120 | inode = igrab(inode); | |
ebdec83b | 121 | BUG_ON(!inode); |
ccd979bd MF |
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); | |
ebdec83b | 132 | BUG_ON(!*arr); |
ccd979bd MF |
133 | } |
134 | return inode; | |
135 | } | |
136 | ||
137 | static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, | |
138 | int type, | |
139 | u32 slot) | |
140 | { | |
141 | char namebuf[40]; | |
142 | struct inode *inode = NULL; | |
143 | u64 blkno; | |
ccd979bd MF |
144 | int status = 0; |
145 | ||
146 | ocfs2_sprintf_system_inode_name(namebuf, | |
147 | sizeof(namebuf), | |
148 | type, slot); | |
149 | ||
be94d117 MF |
150 | status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf, |
151 | strlen(namebuf), &blkno); | |
ccd979bd MF |
152 | if (status < 0) { |
153 | goto bail; | |
154 | } | |
155 | ||
5fa0613e | 156 | inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type); |
ccd979bd MF |
157 | if (IS_ERR(inode)) { |
158 | mlog_errno(PTR_ERR(inode)); | |
159 | inode = NULL; | |
160 | goto bail; | |
161 | } | |
cb25797d JK |
162 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
163 | if (type == LOCAL_USER_QUOTA_SYSTEM_INODE || | |
164 | type == LOCAL_GROUP_QUOTA_SYSTEM_INODE || | |
165 | type == JOURNAL_SYSTEM_INODE) { | |
166 | /* Ignore inode lock on these inodes as the lock does not | |
167 | * really belong to any process and lockdep cannot handle | |
168 | * that */ | |
169 | OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL; | |
170 | } else { | |
171 | lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres. | |
172 | l_lockdep_map, | |
173 | ocfs2_system_inodes[type].si_name, | |
174 | &ocfs2_sysfile_cluster_lock_key[type], 0); | |
175 | } | |
176 | #endif | |
ccd979bd | 177 | bail: |
be94d117 | 178 | |
ccd979bd MF |
179 | return inode; |
180 | } | |
181 |