1ccd979bdSMark Fasheh /* -*- mode: c; c-basic-offset: 8; -*- 2ccd979bdSMark Fasheh * vim: noexpandtab sw=8 ts=8 sts=0: 3ccd979bdSMark Fasheh * 4ccd979bdSMark Fasheh * sysfile.c 5ccd979bdSMark Fasheh * 6ccd979bdSMark Fasheh * Initialize, read, write, etc. system files. 7ccd979bdSMark Fasheh * 8ccd979bdSMark Fasheh * Copyright (C) 2002, 2004 Oracle. All rights reserved. 9ccd979bdSMark Fasheh * 10ccd979bdSMark Fasheh * This program is free software; you can redistribute it and/or 11ccd979bdSMark Fasheh * modify it under the terms of the GNU General Public 12ccd979bdSMark Fasheh * License as published by the Free Software Foundation; either 13ccd979bdSMark Fasheh * version 2 of the License, or (at your option) any later version. 14ccd979bdSMark Fasheh * 15ccd979bdSMark Fasheh * This program is distributed in the hope that it will be useful, 16ccd979bdSMark Fasheh * but WITHOUT ANY WARRANTY; without even the implied warranty of 17ccd979bdSMark Fasheh * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18ccd979bdSMark Fasheh * General Public License for more details. 19ccd979bdSMark Fasheh * 20ccd979bdSMark Fasheh * You should have received a copy of the GNU General Public 21ccd979bdSMark Fasheh * License along with this program; if not, write to the 22ccd979bdSMark Fasheh * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23ccd979bdSMark Fasheh * Boston, MA 021110-1307, USA. 24ccd979bdSMark Fasheh */ 25ccd979bdSMark Fasheh 26ccd979bdSMark Fasheh #include <linux/fs.h> 27ccd979bdSMark Fasheh #include <linux/types.h> 28ccd979bdSMark Fasheh #include <linux/slab.h> 29ccd979bdSMark Fasheh #include <linux/highmem.h> 30ccd979bdSMark Fasheh 31ccd979bdSMark Fasheh #define MLOG_MASK_PREFIX ML_INODE 32ccd979bdSMark Fasheh #include <cluster/masklog.h> 33ccd979bdSMark Fasheh 3480c05846SMark Fasheh #include "ocfs2.h" 3580c05846SMark Fasheh 36ccd979bdSMark Fasheh #include "alloc.h" 37ccd979bdSMark Fasheh #include "dir.h" 38ccd979bdSMark Fasheh #include "inode.h" 39ccd979bdSMark Fasheh #include "journal.h" 40ccd979bdSMark Fasheh #include "sysfile.h" 41ccd979bdSMark Fasheh 42ccd979bdSMark Fasheh #include "buffer_head_io.h" 43ccd979bdSMark Fasheh 44ccd979bdSMark Fasheh static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, 45ccd979bdSMark Fasheh int type, 46ccd979bdSMark Fasheh u32 slot); 47ccd979bdSMark Fasheh 48ccd979bdSMark Fasheh static inline int is_global_system_inode(int type); 49ccd979bdSMark Fasheh static inline int is_in_system_inode_array(struct ocfs2_super *osb, 50ccd979bdSMark Fasheh int type, 51ccd979bdSMark Fasheh u32 slot); 52ccd979bdSMark Fasheh 53d246ab30STao Ma #ifdef CONFIG_DEBUG_LOCK_ALLOC 54cb25797dSJan Kara static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES]; 55d246ab30STao Ma #endif 56cb25797dSJan Kara 57ccd979bdSMark Fasheh static inline int is_global_system_inode(int type) 58ccd979bdSMark Fasheh { 59ccd979bdSMark Fasheh return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE && 60ccd979bdSMark Fasheh type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; 61ccd979bdSMark Fasheh } 62ccd979bdSMark Fasheh 63ccd979bdSMark Fasheh static inline int is_in_system_inode_array(struct ocfs2_super *osb, 64ccd979bdSMark Fasheh int type, 65ccd979bdSMark Fasheh u32 slot) 66ccd979bdSMark Fasheh { 67ccd979bdSMark Fasheh return slot == osb->slot_num || is_global_system_inode(type); 68ccd979bdSMark Fasheh } 69ccd979bdSMark Fasheh 70ccd979bdSMark Fasheh struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb, 71ccd979bdSMark Fasheh int type, 72ccd979bdSMark Fasheh u32 slot) 73ccd979bdSMark Fasheh { 74ccd979bdSMark Fasheh struct inode *inode = NULL; 75ccd979bdSMark Fasheh struct inode **arr = NULL; 76ccd979bdSMark Fasheh 77ccd979bdSMark Fasheh /* avoid the lookup if cached in local system file array */ 78ccd979bdSMark Fasheh if (is_in_system_inode_array(osb, type, slot)) 79ccd979bdSMark Fasheh arr = &(osb->system_inodes[type]); 80ccd979bdSMark Fasheh 81ccd979bdSMark Fasheh if (arr && ((inode = *arr) != NULL)) { 82ccd979bdSMark Fasheh /* get a ref in addition to the array ref */ 83ccd979bdSMark Fasheh inode = igrab(inode); 84ebdec83bSEric Sesterhenn / snakebyte BUG_ON(!inode); 85ccd979bdSMark Fasheh 86ccd979bdSMark Fasheh return inode; 87ccd979bdSMark Fasheh } 88ccd979bdSMark Fasheh 89ccd979bdSMark Fasheh /* this gets one ref thru iget */ 90ccd979bdSMark Fasheh inode = _ocfs2_get_system_file_inode(osb, type, slot); 91ccd979bdSMark Fasheh 92ccd979bdSMark Fasheh /* add one more if putting into array for first time */ 93ccd979bdSMark Fasheh if (arr && inode) { 94ccd979bdSMark Fasheh *arr = igrab(inode); 95ebdec83bSEric Sesterhenn / snakebyte BUG_ON(!*arr); 96ccd979bdSMark Fasheh } 97ccd979bdSMark Fasheh return inode; 98ccd979bdSMark Fasheh } 99ccd979bdSMark Fasheh 100ccd979bdSMark Fasheh static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, 101ccd979bdSMark Fasheh int type, 102ccd979bdSMark Fasheh u32 slot) 103ccd979bdSMark Fasheh { 104ccd979bdSMark Fasheh char namebuf[40]; 105ccd979bdSMark Fasheh struct inode *inode = NULL; 106ccd979bdSMark Fasheh u64 blkno; 107ccd979bdSMark Fasheh int status = 0; 108ccd979bdSMark Fasheh 109ccd979bdSMark Fasheh ocfs2_sprintf_system_inode_name(namebuf, 110ccd979bdSMark Fasheh sizeof(namebuf), 111ccd979bdSMark Fasheh type, slot); 112ccd979bdSMark Fasheh 113be94d117SMark Fasheh status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf, 114be94d117SMark Fasheh strlen(namebuf), &blkno); 115ccd979bdSMark Fasheh if (status < 0) { 116ccd979bdSMark Fasheh goto bail; 117ccd979bdSMark Fasheh } 118ccd979bdSMark Fasheh 1195fa0613eSJan Kara inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type); 120ccd979bdSMark Fasheh if (IS_ERR(inode)) { 121ccd979bdSMark Fasheh mlog_errno(PTR_ERR(inode)); 122ccd979bdSMark Fasheh inode = NULL; 123ccd979bdSMark Fasheh goto bail; 124ccd979bdSMark Fasheh } 125cb25797dSJan Kara #ifdef CONFIG_DEBUG_LOCK_ALLOC 126cb25797dSJan Kara if (type == LOCAL_USER_QUOTA_SYSTEM_INODE || 127cb25797dSJan Kara type == LOCAL_GROUP_QUOTA_SYSTEM_INODE || 128cb25797dSJan Kara type == JOURNAL_SYSTEM_INODE) { 129cb25797dSJan Kara /* Ignore inode lock on these inodes as the lock does not 130cb25797dSJan Kara * really belong to any process and lockdep cannot handle 131cb25797dSJan Kara * that */ 132cb25797dSJan Kara OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL; 133cb25797dSJan Kara } else { 134cb25797dSJan Kara lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres. 135cb25797dSJan Kara l_lockdep_map, 136cb25797dSJan Kara ocfs2_system_inodes[type].si_name, 137cb25797dSJan Kara &ocfs2_sysfile_cluster_lock_key[type], 0); 138cb25797dSJan Kara } 139cb25797dSJan Kara #endif 140ccd979bdSMark Fasheh bail: 141be94d117SMark Fasheh 142ccd979bdSMark Fasheh return inode; 143ccd979bdSMark Fasheh } 144ccd979bdSMark Fasheh 145