blob: 40e53702948cdbc2ed92ce1e22f0827f76017417 [file] [log] [blame]
Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- 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
Mark Fashehccd979b2005-12-15 14:31:24 -080031#define MLOG_MASK_PREFIX ML_INODE
32#include <cluster/masklog.h>
33
Mark Fasheh80c05842006-09-08 14:43:18 -070034#include "ocfs2.h"
35
Mark Fashehccd979b2005-12-15 14:31:24 -080036#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
44static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
45 int type,
46 u32 slot);
47
48static inline int is_global_system_inode(int type);
49static inline int is_in_system_inode_array(struct ocfs2_super *osb,
50 int type,
51 u32 slot);
52
Tao Mad246ab32009-06-18 13:12:06 +080053#ifdef CONFIG_DEBUG_LOCK_ALLOC
Jan Karacb257972009-06-04 15:26:50 +020054static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES];
Tao Mad246ab32009-06-18 13:12:06 +080055#endif
Jan Karacb257972009-06-04 15:26:50 +020056
Mark Fashehccd979b2005-12-15 14:31:24 -080057static inline int is_global_system_inode(int type)
58{
59 return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE &&
60 type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE;
61}
62
63static inline int is_in_system_inode_array(struct ocfs2_super *osb,
64 int type,
65 u32 slot)
66{
67 return slot == osb->slot_num || is_global_system_inode(type);
68}
69
70struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb,
71 int type,
72 u32 slot)
73{
74 struct inode *inode = NULL;
75 struct inode **arr = NULL;
76
77 /* avoid the lookup if cached in local system file array */
78 if (is_in_system_inode_array(osb, type, slot))
79 arr = &(osb->system_inodes[type]);
80
81 if (arr && ((inode = *arr) != NULL)) {
82 /* get a ref in addition to the array ref */
83 inode = igrab(inode);
Eric Sesterhenn / snakebyteebdec832006-01-27 10:32:52 +010084 BUG_ON(!inode);
Mark Fashehccd979b2005-12-15 14:31:24 -080085
86 return inode;
87 }
88
89 /* this gets one ref thru iget */
90 inode = _ocfs2_get_system_file_inode(osb, type, slot);
91
92 /* add one more if putting into array for first time */
93 if (arr && inode) {
94 *arr = igrab(inode);
Eric Sesterhenn / snakebyteebdec832006-01-27 10:32:52 +010095 BUG_ON(!*arr);
Mark Fashehccd979b2005-12-15 14:31:24 -080096 }
97 return inode;
98}
99
100static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
101 int type,
102 u32 slot)
103{
104 char namebuf[40];
105 struct inode *inode = NULL;
106 u64 blkno;
Mark Fashehccd979b2005-12-15 14:31:24 -0800107 int status = 0;
108
109 ocfs2_sprintf_system_inode_name(namebuf,
110 sizeof(namebuf),
111 type, slot);
112
Mark Fashehbe94d112007-09-11 15:22:06 -0700113 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
114 strlen(namebuf), &blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800115 if (status < 0) {
116 goto bail;
117 }
118
Jan Kara5fa06132008-01-11 00:11:45 +0100119 inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type);
Mark Fashehccd979b2005-12-15 14:31:24 -0800120 if (IS_ERR(inode)) {
121 mlog_errno(PTR_ERR(inode));
122 inode = NULL;
123 goto bail;
124 }
Jan Karacb257972009-06-04 15:26:50 +0200125#ifdef CONFIG_DEBUG_LOCK_ALLOC
126 if (type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
127 type == LOCAL_GROUP_QUOTA_SYSTEM_INODE ||
128 type == JOURNAL_SYSTEM_INODE) {
129 /* Ignore inode lock on these inodes as the lock does not
130 * really belong to any process and lockdep cannot handle
131 * that */
132 OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL;
133 } else {
134 lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres.
135 l_lockdep_map,
136 ocfs2_system_inodes[type].si_name,
137 &ocfs2_sysfile_cluster_lock_key[type], 0);
138 }
139#endif
Mark Fashehccd979b2005-12-15 14:31:24 -0800140bail:
Mark Fashehbe94d112007-09-11 15:22:06 -0700141
Mark Fashehccd979b2005-12-15 14:31:24 -0800142 return inode;
143}
144