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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 | ||
53 | static inline int is_global_system_inode(int type) | |
54 | { | |
55 | return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE && | |
56 | type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; | |
57 | } | |
58 | ||
59 | static inline int is_in_system_inode_array(struct ocfs2_super *osb, | |
60 | int type, | |
61 | u32 slot) | |
62 | { | |
63 | return slot == osb->slot_num || is_global_system_inode(type); | |
64 | } | |
65 | ||
66 | struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb, | |
67 | int type, | |
68 | u32 slot) | |
69 | { | |
70 | struct inode *inode = NULL; | |
71 | struct inode **arr = NULL; | |
72 | ||
73 | /* avoid the lookup if cached in local system file array */ | |
74 | if (is_in_system_inode_array(osb, type, slot)) | |
75 | arr = &(osb->system_inodes[type]); | |
76 | ||
77 | if (arr && ((inode = *arr) != NULL)) { | |
78 | /* get a ref in addition to the array ref */ | |
79 | inode = igrab(inode); | |
ebdec83b | 80 | BUG_ON(!inode); |
ccd979bd MF |
81 | |
82 | return inode; | |
83 | } | |
84 | ||
85 | /* this gets one ref thru iget */ | |
86 | inode = _ocfs2_get_system_file_inode(osb, type, slot); | |
87 | ||
88 | /* add one more if putting into array for first time */ | |
89 | if (arr && inode) { | |
90 | *arr = igrab(inode); | |
ebdec83b | 91 | BUG_ON(!*arr); |
ccd979bd MF |
92 | } |
93 | return inode; | |
94 | } | |
95 | ||
96 | static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, | |
97 | int type, | |
98 | u32 slot) | |
99 | { | |
100 | char namebuf[40]; | |
101 | struct inode *inode = NULL; | |
102 | u64 blkno; | |
ccd979bd MF |
103 | int status = 0; |
104 | ||
105 | ocfs2_sprintf_system_inode_name(namebuf, | |
106 | sizeof(namebuf), | |
107 | type, slot); | |
108 | ||
be94d117 MF |
109 | status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf, |
110 | strlen(namebuf), &blkno); | |
ccd979bd MF |
111 | if (status < 0) { |
112 | goto bail; | |
113 | } | |
114 | ||
5fa0613e | 115 | inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type); |
ccd979bd MF |
116 | if (IS_ERR(inode)) { |
117 | mlog_errno(PTR_ERR(inode)); | |
118 | inode = NULL; | |
119 | goto bail; | |
120 | } | |
121 | bail: | |
be94d117 | 122 | |
ccd979bd MF |
123 | return inode; |
124 | } | |
125 |