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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> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/highmem.h> | |
30 | ||
ccd979bd MF |
31 | #define MLOG_MASK_PREFIX ML_INODE |
32 | #include <cluster/masklog.h> | |
33 | ||
80c05846 MF |
34 | #include "ocfs2.h" |
35 | ||
ccd979bd MF |
36 | #include "alloc.h" |
37 | #include "dir.h" | |
38 | #include "inode.h" | |
39 | #include "journal.h" | |
40 | #include "sysfile.h" | |
41 | ||
42 | #include "buffer_head_io.h" | |
43 | ||
44 | static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, | |
45 | int type, | |
46 | u32 slot); | |
47 | ||
48 | static inline int is_global_system_inode(int type); | |
49 | static inline int is_in_system_inode_array(struct ocfs2_super *osb, | |
50 | int type, | |
51 | u32 slot); | |
52 | ||
cb25797d JK |
53 | static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES]; |
54 | ||
ccd979bd MF |
55 | static inline int is_global_system_inode(int type) |
56 | { | |
57 | return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE && | |
58 | type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; | |
59 | } | |
60 | ||
61 | static inline int is_in_system_inode_array(struct ocfs2_super *osb, | |
62 | int type, | |
63 | u32 slot) | |
64 | { | |
65 | return slot == osb->slot_num || is_global_system_inode(type); | |
66 | } | |
67 | ||
68 | struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb, | |
69 | int type, | |
70 | u32 slot) | |
71 | { | |
72 | struct inode *inode = NULL; | |
73 | struct inode **arr = NULL; | |
74 | ||
75 | /* avoid the lookup if cached in local system file array */ | |
76 | if (is_in_system_inode_array(osb, type, slot)) | |
77 | arr = &(osb->system_inodes[type]); | |
78 | ||
79 | if (arr && ((inode = *arr) != NULL)) { | |
80 | /* get a ref in addition to the array ref */ | |
81 | inode = igrab(inode); | |
ebdec83b | 82 | BUG_ON(!inode); |
ccd979bd MF |
83 | |
84 | return inode; | |
85 | } | |
86 | ||
87 | /* this gets one ref thru iget */ | |
88 | inode = _ocfs2_get_system_file_inode(osb, type, slot); | |
89 | ||
90 | /* add one more if putting into array for first time */ | |
91 | if (arr && inode) { | |
92 | *arr = igrab(inode); | |
ebdec83b | 93 | BUG_ON(!*arr); |
ccd979bd MF |
94 | } |
95 | return inode; | |
96 | } | |
97 | ||
98 | static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, | |
99 | int type, | |
100 | u32 slot) | |
101 | { | |
102 | char namebuf[40]; | |
103 | struct inode *inode = NULL; | |
104 | u64 blkno; | |
ccd979bd MF |
105 | int status = 0; |
106 | ||
107 | ocfs2_sprintf_system_inode_name(namebuf, | |
108 | sizeof(namebuf), | |
109 | type, slot); | |
110 | ||
be94d117 MF |
111 | status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf, |
112 | strlen(namebuf), &blkno); | |
ccd979bd MF |
113 | if (status < 0) { |
114 | goto bail; | |
115 | } | |
116 | ||
5fa0613e | 117 | inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type); |
ccd979bd MF |
118 | if (IS_ERR(inode)) { |
119 | mlog_errno(PTR_ERR(inode)); | |
120 | inode = NULL; | |
121 | goto bail; | |
122 | } | |
cb25797d JK |
123 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
124 | if (type == LOCAL_USER_QUOTA_SYSTEM_INODE || | |
125 | type == LOCAL_GROUP_QUOTA_SYSTEM_INODE || | |
126 | type == JOURNAL_SYSTEM_INODE) { | |
127 | /* Ignore inode lock on these inodes as the lock does not | |
128 | * really belong to any process and lockdep cannot handle | |
129 | * that */ | |
130 | OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL; | |
131 | } else { | |
132 | lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres. | |
133 | l_lockdep_map, | |
134 | ocfs2_system_inodes[type].si_name, | |
135 | &ocfs2_sysfile_cluster_lock_key[type], 0); | |
136 | } | |
137 | #endif | |
ccd979bd | 138 | bail: |
be94d117 | 139 | |
ccd979bd MF |
140 | return inode; |
141 | } | |
142 |