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 53ccd979bdSMark Fasheh static inline int is_global_system_inode(int type) 54ccd979bdSMark Fasheh { 55ccd979bdSMark Fasheh return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE && 56ccd979bdSMark Fasheh type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; 57ccd979bdSMark Fasheh } 58ccd979bdSMark Fasheh 59ccd979bdSMark Fasheh static inline int is_in_system_inode_array(struct ocfs2_super *osb, 60ccd979bdSMark Fasheh int type, 61ccd979bdSMark Fasheh u32 slot) 62ccd979bdSMark Fasheh { 63ccd979bdSMark Fasheh return slot == osb->slot_num || is_global_system_inode(type); 64ccd979bdSMark Fasheh } 65ccd979bdSMark Fasheh 66ccd979bdSMark Fasheh struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb, 67ccd979bdSMark Fasheh int type, 68ccd979bdSMark Fasheh u32 slot) 69ccd979bdSMark Fasheh { 70ccd979bdSMark Fasheh struct inode *inode = NULL; 71ccd979bdSMark Fasheh struct inode **arr = NULL; 72ccd979bdSMark Fasheh 73ccd979bdSMark Fasheh /* avoid the lookup if cached in local system file array */ 74ccd979bdSMark Fasheh if (is_in_system_inode_array(osb, type, slot)) 75ccd979bdSMark Fasheh arr = &(osb->system_inodes[type]); 76ccd979bdSMark Fasheh 77ccd979bdSMark Fasheh if (arr && ((inode = *arr) != NULL)) { 78ccd979bdSMark Fasheh /* get a ref in addition to the array ref */ 79ccd979bdSMark Fasheh inode = igrab(inode); 80ebdec83bSEric Sesterhenn / snakebyte BUG_ON(!inode); 81ccd979bdSMark Fasheh 82ccd979bdSMark Fasheh return inode; 83ccd979bdSMark Fasheh } 84ccd979bdSMark Fasheh 85ccd979bdSMark Fasheh /* this gets one ref thru iget */ 86ccd979bdSMark Fasheh inode = _ocfs2_get_system_file_inode(osb, type, slot); 87ccd979bdSMark Fasheh 88ccd979bdSMark Fasheh /* add one more if putting into array for first time */ 89ccd979bdSMark Fasheh if (arr && inode) { 90ccd979bdSMark Fasheh *arr = igrab(inode); 91ebdec83bSEric Sesterhenn / snakebyte BUG_ON(!*arr); 92ccd979bdSMark Fasheh } 93ccd979bdSMark Fasheh return inode; 94ccd979bdSMark Fasheh } 95ccd979bdSMark Fasheh 96ccd979bdSMark Fasheh static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, 97ccd979bdSMark Fasheh int type, 98ccd979bdSMark Fasheh u32 slot) 99ccd979bdSMark Fasheh { 100ccd979bdSMark Fasheh char namebuf[40]; 101ccd979bdSMark Fasheh struct inode *inode = NULL; 102ccd979bdSMark Fasheh u64 blkno; 103ccd979bdSMark Fasheh struct buffer_head *dirent_bh = NULL; 104ccd979bdSMark Fasheh struct ocfs2_dir_entry *de = NULL; 105ccd979bdSMark Fasheh int status = 0; 106ccd979bdSMark Fasheh 107ccd979bdSMark Fasheh ocfs2_sprintf_system_inode_name(namebuf, 108ccd979bdSMark Fasheh sizeof(namebuf), 109ccd979bdSMark Fasheh type, slot); 110ccd979bdSMark Fasheh 111ccd979bdSMark Fasheh status = ocfs2_find_files_on_disk(namebuf, strlen(namebuf), 112ccd979bdSMark Fasheh &blkno, osb->sys_root_inode, 113ccd979bdSMark Fasheh &dirent_bh, &de); 114ccd979bdSMark Fasheh if (status < 0) { 115ccd979bdSMark Fasheh goto bail; 116ccd979bdSMark Fasheh } 117ccd979bdSMark Fasheh 118ccd979bdSMark Fasheh inode = ocfs2_iget(osb, blkno); 119ccd979bdSMark Fasheh if (IS_ERR(inode)) { 120ccd979bdSMark Fasheh mlog_errno(PTR_ERR(inode)); 121ccd979bdSMark Fasheh inode = NULL; 122ccd979bdSMark Fasheh goto bail; 123ccd979bdSMark Fasheh } 124ccd979bdSMark Fasheh bail: 125ccd979bdSMark Fasheh if (dirent_bh) 126ccd979bdSMark Fasheh brelse(dirent_bh); 127ccd979bdSMark Fasheh return inode; 128ccd979bdSMark Fasheh } 129ccd979bdSMark Fasheh 130