blob: bfe7190cdbf1b0969cc5e2ade3096a9cea16e9ad [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>
Mark Fashehccd979b2005-12-15 14:31:24 -080028#include <linux/highmem.h>
29
Mark Fashehccd979b2005-12-15 14:31:24 -080030#define MLOG_MASK_PREFIX ML_INODE
31#include <cluster/masklog.h>
32
Mark Fasheh80c05842006-09-08 14:43:18 -070033#include "ocfs2.h"
34
Mark Fashehccd979b2005-12-15 14:31:24 -080035#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
43static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
44 int type,
45 u32 slot);
46
47static inline int is_global_system_inode(int type);
48static inline int is_in_system_inode_array(struct ocfs2_super *osb,
49 int type,
50 u32 slot);
51
Tao Mad246ab32009-06-18 13:12:06 +080052#ifdef CONFIG_DEBUG_LOCK_ALLOC
Jan Karacb257972009-06-04 15:26:50 +020053static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES];
Tao Mad246ab32009-06-18 13:12:06 +080054#endif
Jan Karacb257972009-06-04 15:26:50 +020055
Mark Fashehccd979b2005-12-15 14:31:24 -080056static 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
62static 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
69struct 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);
Eric Sesterhenn / snakebyteebdec832006-01-27 10:32:52 +010083 BUG_ON(!inode);
Mark Fashehccd979b2005-12-15 14:31:24 -080084
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);
Eric Sesterhenn / snakebyteebdec832006-01-27 10:32:52 +010094 BUG_ON(!*arr);
Mark Fashehccd979b2005-12-15 14:31:24 -080095 }
96 return inode;
97}
98
99static 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;
Mark Fashehccd979b2005-12-15 14:31:24 -0800106 int status = 0;
107
108 ocfs2_sprintf_system_inode_name(namebuf,
109 sizeof(namebuf),
110 type, slot);
111
Mark Fashehbe94d112007-09-11 15:22:06 -0700112 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
113 strlen(namebuf), &blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800114 if (status < 0) {
115 goto bail;
116 }
117
Jan Kara5fa06132008-01-11 00:11:45 +0100118 inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type);
Mark Fashehccd979b2005-12-15 14:31:24 -0800119 if (IS_ERR(inode)) {
120 mlog_errno(PTR_ERR(inode));
121 inode = NULL;
122 goto bail;
123 }
Jan Karacb257972009-06-04 15:26:50 +0200124#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
Mark Fashehccd979b2005-12-15 14:31:24 -0800139bail:
Mark Fashehbe94d112007-09-11 15:22:06 -0700140
Mark Fashehccd979b2005-12-15 14:31:24 -0800141 return inode;
142}
143