blob: 902efb23b6a66cbe086e3d6f0b95fb883d6f95b2 [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
Tao Mad246ab32009-06-18 13:12:06 +080047#ifdef CONFIG_DEBUG_LOCK_ALLOC
Jan Karacb257972009-06-04 15:26:50 +020048static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES];
Tao Mad246ab32009-06-18 13:12:06 +080049#endif
Jan Karacb257972009-06-04 15:26:50 +020050
Mark Fashehccd979b2005-12-15 14:31:24 -080051static inline int is_global_system_inode(int type)
52{
53 return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE &&
54 type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE;
55}
56
Tao Mab4d693f2010-08-16 16:58:21 +080057static struct inode **get_local_system_inode(struct ocfs2_super *osb,
58 int type,
59 u32 slot)
Mark Fashehccd979b2005-12-15 14:31:24 -080060{
Tao Mab4d693f2010-08-16 16:58:21 +080061 int index;
62 struct inode **local_system_inodes, **free = NULL;
63
64 BUG_ON(slot == OCFS2_INVALID_SLOT);
65 BUG_ON(type < OCFS2_FIRST_LOCAL_SYSTEM_INODE ||
66 type > OCFS2_LAST_LOCAL_SYSTEM_INODE);
67
68 spin_lock(&osb->osb_lock);
69 local_system_inodes = osb->local_system_inodes;
70 spin_unlock(&osb->osb_lock);
71
72 if (unlikely(!local_system_inodes)) {
73 local_system_inodes = kzalloc(sizeof(struct inode *) *
74 NUM_LOCAL_SYSTEM_INODES *
75 osb->max_slots,
76 GFP_NOFS);
77 if (!local_system_inodes) {
78 mlog_errno(-ENOMEM);
79 /*
80 * return NULL here so that ocfs2_get_sytem_file_inodes
81 * will try to create an inode and use it. We will try
82 * to initialize local_system_inodes next time.
83 */
84 return NULL;
85 }
86
87 spin_lock(&osb->osb_lock);
88 if (osb->local_system_inodes) {
89 /* Someone has initialized it for us. */
90 free = local_system_inodes;
91 local_system_inodes = osb->local_system_inodes;
92 } else
93 osb->local_system_inodes = local_system_inodes;
94 spin_unlock(&osb->osb_lock);
95 if (unlikely(free))
96 kfree(free);
97 }
98
99 index = (slot * NUM_LOCAL_SYSTEM_INODES) +
100 (type - OCFS2_FIRST_LOCAL_SYSTEM_INODE);
101
102 return &local_system_inodes[index];
Mark Fashehccd979b2005-12-15 14:31:24 -0800103}
104
105struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb,
106 int type,
107 u32 slot)
108{
109 struct inode *inode = NULL;
110 struct inode **arr = NULL;
111
112 /* avoid the lookup if cached in local system file array */
Tao Mab4d693f2010-08-16 16:58:21 +0800113 if (is_global_system_inode(type)) {
114 arr = &(osb->global_system_inodes[type]);
115 } else
116 arr = get_local_system_inode(osb, type, slot);
Mark Fashehccd979b2005-12-15 14:31:24 -0800117
118 if (arr && ((inode = *arr) != NULL)) {
119 /* get a ref in addition to the array ref */
120 inode = igrab(inode);
Eric Sesterhenn / snakebyteebdec832006-01-27 10:32:52 +0100121 BUG_ON(!inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800122
123 return inode;
124 }
125
126 /* this gets one ref thru iget */
127 inode = _ocfs2_get_system_file_inode(osb, type, slot);
128
129 /* add one more if putting into array for first time */
130 if (arr && inode) {
131 *arr = igrab(inode);
Eric Sesterhenn / snakebyteebdec832006-01-27 10:32:52 +0100132 BUG_ON(!*arr);
Mark Fashehccd979b2005-12-15 14:31:24 -0800133 }
134 return inode;
135}
136
137static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
138 int type,
139 u32 slot)
140{
141 char namebuf[40];
142 struct inode *inode = NULL;
143 u64 blkno;
Mark Fashehccd979b2005-12-15 14:31:24 -0800144 int status = 0;
145
146 ocfs2_sprintf_system_inode_name(namebuf,
147 sizeof(namebuf),
148 type, slot);
149
Mark Fashehbe94d112007-09-11 15:22:06 -0700150 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
151 strlen(namebuf), &blkno);
Mark Fashehccd979b2005-12-15 14:31:24 -0800152 if (status < 0) {
153 goto bail;
154 }
155
Jan Kara5fa06132008-01-11 00:11:45 +0100156 inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type);
Mark Fashehccd979b2005-12-15 14:31:24 -0800157 if (IS_ERR(inode)) {
158 mlog_errno(PTR_ERR(inode));
159 inode = NULL;
160 goto bail;
161 }
Jan Karacb257972009-06-04 15:26:50 +0200162#ifdef CONFIG_DEBUG_LOCK_ALLOC
163 if (type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
164 type == LOCAL_GROUP_QUOTA_SYSTEM_INODE ||
165 type == JOURNAL_SYSTEM_INODE) {
166 /* Ignore inode lock on these inodes as the lock does not
167 * really belong to any process and lockdep cannot handle
168 * that */
169 OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL;
170 } else {
171 lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres.
172 l_lockdep_map,
173 ocfs2_system_inodes[type].si_name,
174 &ocfs2_sysfile_cluster_lock_key[type], 0);
175 }
176#endif
Mark Fashehccd979b2005-12-15 14:31:24 -0800177bail:
Mark Fashehbe94d112007-09-11 15:22:06 -0700178
Mark Fashehccd979b2005-12-15 14:31:24 -0800179 return inode;
180}
181