1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * Initialize, read, write, etc. system files.
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
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.
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.
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.
27 #include <linux/types.h>
28 #include <linux/slab.h>
29 #include <linux/highmem.h>
31 #define MLOG_MASK_PREFIX ML_INODE
32 #include <cluster/masklog.h>
42 #include "buffer_head_io.h"
44 static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
48 static inline int is_global_system_inode(int type);
49 static inline int is_in_system_inode_array(struct ocfs2_super *osb,
53 static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES];
55 static inline int is_global_system_inode(int type)
57 return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE &&
58 type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE;
61 static inline int is_in_system_inode_array(struct ocfs2_super *osb,
65 return slot == osb->slot_num || is_global_system_inode(type);
68 struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb,
72 struct inode *inode = NULL;
73 struct inode **arr = NULL;
75 /* avoid the lookup if cached in local system file array */
76 if (is_in_system_inode_array(osb, type, slot))
77 arr = &(osb->system_inodes[type]);
79 if (arr && ((inode = *arr) != NULL)) {
80 /* get a ref in addition to the array ref */
87 /* this gets one ref thru iget */
88 inode = _ocfs2_get_system_file_inode(osb, type, slot);
90 /* add one more if putting into array for first time */
98 static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
103 struct inode *inode = NULL;
107 ocfs2_sprintf_system_inode_name(namebuf,
111 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
112 strlen(namebuf), &blkno);
117 inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type);
119 mlog_errno(PTR_ERR(inode));
123 #ifdef CONFIG_DEBUG_LOCK_ALLOC
124 if (type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
125 type == LOCAL_GROUP_QUOTA_SYSTEM_INODE ||
126 type == JOURNAL_SYSTEM_INODE) {
127 /* Ignore inode lock on these inodes as the lock does not
128 * really belong to any process and lockdep cannot handle
130 OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL;
132 lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres.
134 ocfs2_system_inodes[type].si_name,
135 &ocfs2_sysfile_cluster_lock_key[type], 0);