1 /* -*- 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/highmem.h> 29 30 #define MLOG_MASK_PREFIX ML_INODE 31 #include <cluster/masklog.h> 32 33 #include "ocfs2.h" 34 35 #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 43 static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, 44 int type, 45 u32 slot); 46 47 static inline int is_global_system_inode(int type); 48 static inline int is_in_system_inode_array(struct ocfs2_super *osb, 49 int type, 50 u32 slot); 51 52 #ifdef CONFIG_DEBUG_LOCK_ALLOC 53 static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES]; 54 #endif 55 56 static 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 62 static 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 69 struct 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); 83 BUG_ON(!inode); 84 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); 94 BUG_ON(!*arr); 95 } 96 return inode; 97 } 98 99 static 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; 106 int status = 0; 107 108 ocfs2_sprintf_system_inode_name(namebuf, 109 sizeof(namebuf), 110 type, slot); 111 112 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf, 113 strlen(namebuf), &blkno); 114 if (status < 0) { 115 goto bail; 116 } 117 118 inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type); 119 if (IS_ERR(inode)) { 120 mlog_errno(PTR_ERR(inode)); 121 inode = NULL; 122 goto bail; 123 } 124 #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 139 bail: 140 141 return inode; 142 } 143 144