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 static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES]; 54 55 static inline int is_global_system_inode(int type) 56 { 57 return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE && 58 type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; 59 } 60 61 static inline int is_in_system_inode_array(struct ocfs2_super *osb, 62 int type, 63 u32 slot) 64 { 65 return slot == osb->slot_num || is_global_system_inode(type); 66 } 67 68 struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb, 69 int type, 70 u32 slot) 71 { 72 struct inode *inode = NULL; 73 struct inode **arr = NULL; 74 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]); 78 79 if (arr && ((inode = *arr) != NULL)) { 80 /* get a ref in addition to the array ref */ 81 inode = igrab(inode); 82 BUG_ON(!inode); 83 84 return inode; 85 } 86 87 /* this gets one ref thru iget */ 88 inode = _ocfs2_get_system_file_inode(osb, type, slot); 89 90 /* add one more if putting into array for first time */ 91 if (arr && inode) { 92 *arr = igrab(inode); 93 BUG_ON(!*arr); 94 } 95 return inode; 96 } 97 98 static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, 99 int type, 100 u32 slot) 101 { 102 char namebuf[40]; 103 struct inode *inode = NULL; 104 u64 blkno; 105 int status = 0; 106 107 ocfs2_sprintf_system_inode_name(namebuf, 108 sizeof(namebuf), 109 type, slot); 110 111 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf, 112 strlen(namebuf), &blkno); 113 if (status < 0) { 114 goto bail; 115 } 116 117 inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type); 118 if (IS_ERR(inode)) { 119 mlog_errno(PTR_ERR(inode)); 120 inode = NULL; 121 goto bail; 122 } 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 129 * that */ 130 OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL; 131 } else { 132 lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres. 133 l_lockdep_map, 134 ocfs2_system_inodes[type].si_name, 135 &ocfs2_sysfile_cluster_lock_key[type], 0); 136 } 137 #endif 138 bail: 139 140 return inode; 141 } 142 143