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/slab.h> 29 #include <linux/highmem.h> 30 31 #define MLOG_MASK_PREFIX ML_INODE 32 #include <cluster/masklog.h> 33 34 #include "ocfs2.h" 35 36 #include "alloc.h" 37 #include "dir.h" 38 #include "inode.h" 39 #include "journal.h" 40 #include "sysfile.h" 41 42 #include "buffer_head_io.h" 43 44 static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, 45 int type, 46 u32 slot); 47 48 static inline int is_global_system_inode(int type); 49 static inline int is_in_system_inode_array(struct ocfs2_super *osb, 50 int type, 51 u32 slot); 52 53 #ifdef CONFIG_DEBUG_LOCK_ALLOC 54 static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES]; 55 #endif 56 57 static inline int is_global_system_inode(int type) 58 { 59 return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE && 60 type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; 61 } 62 63 static inline int is_in_system_inode_array(struct ocfs2_super *osb, 64 int type, 65 u32 slot) 66 { 67 return slot == osb->slot_num || is_global_system_inode(type); 68 } 69 70 struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb, 71 int type, 72 u32 slot) 73 { 74 struct inode *inode = NULL; 75 struct inode **arr = NULL; 76 77 /* avoid the lookup if cached in local system file array */ 78 if (is_in_system_inode_array(osb, type, slot)) 79 arr = &(osb->system_inodes[type]); 80 81 if (arr && ((inode = *arr) != NULL)) { 82 /* get a ref in addition to the array ref */ 83 inode = igrab(inode); 84 BUG_ON(!inode); 85 86 return inode; 87 } 88 89 /* this gets one ref thru iget */ 90 inode = _ocfs2_get_system_file_inode(osb, type, slot); 91 92 /* add one more if putting into array for first time */ 93 if (arr && inode) { 94 *arr = igrab(inode); 95 BUG_ON(!*arr); 96 } 97 return inode; 98 } 99 100 static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, 101 int type, 102 u32 slot) 103 { 104 char namebuf[40]; 105 struct inode *inode = NULL; 106 u64 blkno; 107 int status = 0; 108 109 ocfs2_sprintf_system_inode_name(namebuf, 110 sizeof(namebuf), 111 type, slot); 112 113 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf, 114 strlen(namebuf), &blkno); 115 if (status < 0) { 116 goto bail; 117 } 118 119 inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type); 120 if (IS_ERR(inode)) { 121 mlog_errno(PTR_ERR(inode)); 122 inode = NULL; 123 goto bail; 124 } 125 #ifdef CONFIG_DEBUG_LOCK_ALLOC 126 if (type == LOCAL_USER_QUOTA_SYSTEM_INODE || 127 type == LOCAL_GROUP_QUOTA_SYSTEM_INODE || 128 type == JOURNAL_SYSTEM_INODE) { 129 /* Ignore inode lock on these inodes as the lock does not 130 * really belong to any process and lockdep cannot handle 131 * that */ 132 OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL; 133 } else { 134 lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres. 135 l_lockdep_map, 136 ocfs2_system_inodes[type].si_name, 137 &ocfs2_sysfile_cluster_lock_key[type], 0); 138 } 139 #endif 140 bail: 141 142 return inode; 143 } 144 145