blob: f053688d22a349ebf6803ecd676f64566fe90de0 [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#include <cluster/masklog.h>
31
Mark Fasheh80c05842006-09-08 14:43:18 -070032#include "ocfs2.h"
33
Mark Fashehccd979b2005-12-15 14:31:24 -080034#include "alloc.h"
35#include "dir.h"
36#include "inode.h"
37#include "journal.h"
38#include "sysfile.h"
39
40#include "buffer_head_io.h"
41
42static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
43 int type,
44 u32 slot);
45
Tao Mad246ab32009-06-18 13:12:06 +080046#ifdef CONFIG_DEBUG_LOCK_ALLOC
Jan Karacb257972009-06-04 15:26:50 +020047static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES];
Tao Mad246ab32009-06-18 13:12:06 +080048#endif
Jan Karacb257972009-06-04 15:26:50 +020049
Mark Fashehccd979b2005-12-15 14:31:24 -080050static inline int is_global_system_inode(int type)
51{
52 return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE &&
53 type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE;
54}
55
Tao Mab4d693f2010-08-16 16:58:21 +080056static struct inode **get_local_system_inode(struct ocfs2_super *osb,
57 int type,
58 u32 slot)
Mark Fashehccd979b2005-12-15 14:31:24 -080059{
Tao Mab4d693f2010-08-16 16:58:21 +080060 int index;
61 struct inode **local_system_inodes, **free = NULL;
62
63 BUG_ON(slot == OCFS2_INVALID_SLOT);
64 BUG_ON(type < OCFS2_FIRST_LOCAL_SYSTEM_INODE ||
65 type > OCFS2_LAST_LOCAL_SYSTEM_INODE);
66
67 spin_lock(&osb->osb_lock);
68 local_system_inodes = osb->local_system_inodes;
69 spin_unlock(&osb->osb_lock);
70
71 if (unlikely(!local_system_inodes)) {
72 local_system_inodes = kzalloc(sizeof(struct inode *) *
73 NUM_LOCAL_SYSTEM_INODES *
74 osb->max_slots,
75 GFP_NOFS);
76 if (!local_system_inodes) {
77 mlog_errno(-ENOMEM);
78 /*
79 * return NULL here so that ocfs2_get_sytem_file_inodes
80 * will try to create an inode and use it. We will try
81 * to initialize local_system_inodes next time.
82 */
83 return NULL;
84 }
85
86 spin_lock(&osb->osb_lock);
87 if (osb->local_system_inodes) {
88 /* Someone has initialized it for us. */
89 free = local_system_inodes;
90 local_system_inodes = osb->local_system_inodes;
91 } else
92 osb->local_system_inodes = local_system_inodes;
93 spin_unlock(&osb->osb_lock);
Tim Gardnerd787ab02013-02-21 16:42:44 -080094 kfree(free);
Tao Mab4d693f2010-08-16 16:58:21 +080095 }
96
97 index = (slot * NUM_LOCAL_SYSTEM_INODES) +
98 (type - OCFS2_FIRST_LOCAL_SYSTEM_INODE);
99
100 return &local_system_inodes[index];
Mark Fashehccd979b2005-12-15 14:31:24 -0800101}
102
103struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb,
104 int type,
105 u32 slot)
106{
107 struct inode *inode = NULL;
108 struct inode **arr = NULL;
109
110 /* avoid the lookup if cached in local system file array */
Tao Mab4d693f2010-08-16 16:58:21 +0800111 if (is_global_system_inode(type)) {
112 arr = &(osb->global_system_inodes[type]);
113 } else
114 arr = get_local_system_inode(osb, type, slot);
Mark Fashehccd979b2005-12-15 14:31:24 -0800115
116 if (arr && ((inode = *arr) != NULL)) {
117 /* get a ref in addition to the array ref */
118 inode = igrab(inode);
Eric Sesterhenn / snakebyteebdec832006-01-27 10:32:52 +0100119 BUG_ON(!inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800120
121 return inode;
122 }
123
124 /* this gets one ref thru iget */
125 inode = _ocfs2_get_system_file_inode(osb, type, slot);
126
127 /* add one more if putting into array for first time */
128 if (arr && inode) {
129 *arr = igrab(inode);
Eric Sesterhenn / snakebyteebdec832006-01-27 10:32:52 +0100130 BUG_ON(!*arr);
Mark Fashehccd979b2005-12-15 14:31:24 -0800131 }
132 return inode;
133}
134
135static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
136 int type,
137 u32 slot)
138{
139 char namebuf[40];
140 struct inode *inode = NULL;
141 u64 blkno;
Mark Fashehccd979b2005-12-15 14:31:24 -0800142 int status = 0;
143
144 ocfs2_sprintf_system_inode_name(namebuf,
145 sizeof(namebuf),
146 type, slot);
147
Mark Fashehbe94d112007-09-11 15:22:06 -0700148 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
149 strlen(namebuf), &blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800150 if (status < 0) {
151 goto bail;
152 }
153
Jan Kara5fa06132008-01-11 00:11:45 +0100154 inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type);
Mark Fashehccd979b2005-12-15 14:31:24 -0800155 if (IS_ERR(inode)) {
156 mlog_errno(PTR_ERR(inode));
157 inode = NULL;
158 goto bail;
159 }
Jan Karacb257972009-06-04 15:26:50 +0200160#ifdef CONFIG_DEBUG_LOCK_ALLOC
161 if (type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
162 type == LOCAL_GROUP_QUOTA_SYSTEM_INODE ||
163 type == JOURNAL_SYSTEM_INODE) {
164 /* Ignore inode lock on these inodes as the lock does not
165 * really belong to any process and lockdep cannot handle
166 * that */
167 OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL;
168 } else {
169 lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres.
170 l_lockdep_map,
171 ocfs2_system_inodes[type].si_name,
172 &ocfs2_sysfile_cluster_lock_key[type], 0);
173 }
174#endif
Mark Fashehccd979b2005-12-15 14:31:24 -0800175bail:
Mark Fashehbe94d112007-09-11 15:22:06 -0700176
Mark Fashehccd979b2005-12-15 14:31:24 -0800177 return inode;
178}
179