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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 | #define MLOG_MASK_PREFIX ML_INODE |
31 | #include <cluster/masklog.h> |
32 | |
33 | #include "ocfs2.h" |
34 | |
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 | |
47 | static inline int is_global_system_inode(int type); |
48 | static inline int is_in_system_inode_array(struct ocfs2_super *osb, |
49 | int type, |
50 | u32 slot); |
51 | |
52 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
53 | static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES]; |
54 | #endif |
55 | |
56 | static inline int is_global_system_inode(int type) |
57 | { |
58 | return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE && |
59 | type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; |
60 | } |
61 | |
62 | static inline int is_in_system_inode_array(struct ocfs2_super *osb, |
63 | int type, |
64 | u32 slot) |
65 | { |
66 | return slot == osb->slot_num || is_global_system_inode(type); |
67 | } |
68 | |
69 | struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb, |
70 | int type, |
71 | u32 slot) |
72 | { |
73 | struct inode *inode = NULL; |
74 | struct inode **arr = NULL; |
75 | |
76 | /* avoid the lookup if cached in local system file array */ |
77 | if (is_in_system_inode_array(osb, type, slot)) |
78 | arr = &(osb->system_inodes[type]); |
79 | |
80 | if (arr && ((inode = *arr) != NULL)) { |
81 | /* get a ref in addition to the array ref */ |
82 | inode = igrab(inode); |
83 | BUG_ON(!inode); |
84 | |
85 | return inode; |
86 | } |
87 | |
88 | /* this gets one ref thru iget */ |
89 | inode = _ocfs2_get_system_file_inode(osb, type, slot); |
90 | |
91 | /* add one more if putting into array for first time */ |
92 | if (arr && inode) { |
93 | *arr = igrab(inode); |
94 | BUG_ON(!*arr); |
95 | } |
96 | return inode; |
97 | } |
98 | |
99 | static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, |
100 | int type, |
101 | u32 slot) |
102 | { |
103 | char namebuf[40]; |
104 | struct inode *inode = NULL; |
105 | u64 blkno; |
106 | int status = 0; |
107 | |
108 | ocfs2_sprintf_system_inode_name(namebuf, |
109 | sizeof(namebuf), |
110 | type, slot); |
111 | |
112 | status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf, |
113 | strlen(namebuf), &blkno); |
114 | if (status < 0) { |
115 | goto bail; |
116 | } |
117 | |
118 | inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type); |
119 | if (IS_ERR(inode)) { |
120 | mlog_errno(PTR_ERR(inode)); |
121 | inode = NULL; |
122 | goto bail; |
123 | } |
124 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
125 | if (type == LOCAL_USER_QUOTA_SYSTEM_INODE || |
126 | type == LOCAL_GROUP_QUOTA_SYSTEM_INODE || |
127 | type == JOURNAL_SYSTEM_INODE) { |
128 | /* Ignore inode lock on these inodes as the lock does not |
129 | * really belong to any process and lockdep cannot handle |
130 | * that */ |
131 | OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL; |
132 | } else { |
133 | lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres. |
134 | l_lockdep_map, |
135 | ocfs2_system_inodes[type].si_name, |
136 | &ocfs2_sysfile_cluster_lock_key[type], 0); |
137 | } |
138 | #endif |
139 | bail: |
140 | |
141 | return inode; |
142 | } |
143 | |
144 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9