1*ccd979bdSMark Fasheh /* -*- mode: c; c-basic-offset: 8; -*- 2*ccd979bdSMark Fasheh * vim: noexpandtab sw=8 ts=8 sts=0: 3*ccd979bdSMark Fasheh * 4*ccd979bdSMark Fasheh * sysfile.c 5*ccd979bdSMark Fasheh * 6*ccd979bdSMark Fasheh * Initialize, read, write, etc. system files. 7*ccd979bdSMark Fasheh * 8*ccd979bdSMark Fasheh * Copyright (C) 2002, 2004 Oracle. All rights reserved. 9*ccd979bdSMark Fasheh * 10*ccd979bdSMark Fasheh * This program is free software; you can redistribute it and/or 11*ccd979bdSMark Fasheh * modify it under the terms of the GNU General Public 12*ccd979bdSMark Fasheh * License as published by the Free Software Foundation; either 13*ccd979bdSMark Fasheh * version 2 of the License, or (at your option) any later version. 14*ccd979bdSMark Fasheh * 15*ccd979bdSMark Fasheh * This program is distributed in the hope that it will be useful, 16*ccd979bdSMark Fasheh * but WITHOUT ANY WARRANTY; without even the implied warranty of 17*ccd979bdSMark Fasheh * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18*ccd979bdSMark Fasheh * General Public License for more details. 19*ccd979bdSMark Fasheh * 20*ccd979bdSMark Fasheh * You should have received a copy of the GNU General Public 21*ccd979bdSMark Fasheh * License along with this program; if not, write to the 22*ccd979bdSMark Fasheh * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23*ccd979bdSMark Fasheh * Boston, MA 021110-1307, USA. 24*ccd979bdSMark Fasheh */ 25*ccd979bdSMark Fasheh 26*ccd979bdSMark Fasheh #include <linux/fs.h> 27*ccd979bdSMark Fasheh #include <linux/types.h> 28*ccd979bdSMark Fasheh #include <linux/slab.h> 29*ccd979bdSMark Fasheh #include <linux/highmem.h> 30*ccd979bdSMark Fasheh 31*ccd979bdSMark Fasheh #include "ocfs2.h" 32*ccd979bdSMark Fasheh 33*ccd979bdSMark Fasheh #define MLOG_MASK_PREFIX ML_INODE 34*ccd979bdSMark Fasheh #include <cluster/masklog.h> 35*ccd979bdSMark Fasheh 36*ccd979bdSMark Fasheh #include "alloc.h" 37*ccd979bdSMark Fasheh #include "dir.h" 38*ccd979bdSMark Fasheh #include "inode.h" 39*ccd979bdSMark Fasheh #include "journal.h" 40*ccd979bdSMark Fasheh #include "sysfile.h" 41*ccd979bdSMark Fasheh 42*ccd979bdSMark Fasheh #include "buffer_head_io.h" 43*ccd979bdSMark Fasheh 44*ccd979bdSMark Fasheh static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, 45*ccd979bdSMark Fasheh int type, 46*ccd979bdSMark Fasheh u32 slot); 47*ccd979bdSMark Fasheh 48*ccd979bdSMark Fasheh static inline int is_global_system_inode(int type); 49*ccd979bdSMark Fasheh static inline int is_in_system_inode_array(struct ocfs2_super *osb, 50*ccd979bdSMark Fasheh int type, 51*ccd979bdSMark Fasheh u32 slot); 52*ccd979bdSMark Fasheh 53*ccd979bdSMark Fasheh static inline int is_global_system_inode(int type) 54*ccd979bdSMark Fasheh { 55*ccd979bdSMark Fasheh return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE && 56*ccd979bdSMark Fasheh type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; 57*ccd979bdSMark Fasheh } 58*ccd979bdSMark Fasheh 59*ccd979bdSMark Fasheh static inline int is_in_system_inode_array(struct ocfs2_super *osb, 60*ccd979bdSMark Fasheh int type, 61*ccd979bdSMark Fasheh u32 slot) 62*ccd979bdSMark Fasheh { 63*ccd979bdSMark Fasheh return slot == osb->slot_num || is_global_system_inode(type); 64*ccd979bdSMark Fasheh } 65*ccd979bdSMark Fasheh 66*ccd979bdSMark Fasheh struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb, 67*ccd979bdSMark Fasheh int type, 68*ccd979bdSMark Fasheh u32 slot) 69*ccd979bdSMark Fasheh { 70*ccd979bdSMark Fasheh struct inode *inode = NULL; 71*ccd979bdSMark Fasheh struct inode **arr = NULL; 72*ccd979bdSMark Fasheh 73*ccd979bdSMark Fasheh /* avoid the lookup if cached in local system file array */ 74*ccd979bdSMark Fasheh if (is_in_system_inode_array(osb, type, slot)) 75*ccd979bdSMark Fasheh arr = &(osb->system_inodes[type]); 76*ccd979bdSMark Fasheh 77*ccd979bdSMark Fasheh if (arr && ((inode = *arr) != NULL)) { 78*ccd979bdSMark Fasheh /* get a ref in addition to the array ref */ 79*ccd979bdSMark Fasheh inode = igrab(inode); 80*ccd979bdSMark Fasheh if (!inode) 81*ccd979bdSMark Fasheh BUG(); 82*ccd979bdSMark Fasheh 83*ccd979bdSMark Fasheh return inode; 84*ccd979bdSMark Fasheh } 85*ccd979bdSMark Fasheh 86*ccd979bdSMark Fasheh /* this gets one ref thru iget */ 87*ccd979bdSMark Fasheh inode = _ocfs2_get_system_file_inode(osb, type, slot); 88*ccd979bdSMark Fasheh 89*ccd979bdSMark Fasheh /* add one more if putting into array for first time */ 90*ccd979bdSMark Fasheh if (arr && inode) { 91*ccd979bdSMark Fasheh *arr = igrab(inode); 92*ccd979bdSMark Fasheh if (!*arr) 93*ccd979bdSMark Fasheh BUG(); 94*ccd979bdSMark Fasheh } 95*ccd979bdSMark Fasheh return inode; 96*ccd979bdSMark Fasheh } 97*ccd979bdSMark Fasheh 98*ccd979bdSMark Fasheh static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, 99*ccd979bdSMark Fasheh int type, 100*ccd979bdSMark Fasheh u32 slot) 101*ccd979bdSMark Fasheh { 102*ccd979bdSMark Fasheh char namebuf[40]; 103*ccd979bdSMark Fasheh struct inode *inode = NULL; 104*ccd979bdSMark Fasheh u64 blkno; 105*ccd979bdSMark Fasheh struct buffer_head *dirent_bh = NULL; 106*ccd979bdSMark Fasheh struct ocfs2_dir_entry *de = NULL; 107*ccd979bdSMark Fasheh int status = 0; 108*ccd979bdSMark Fasheh 109*ccd979bdSMark Fasheh ocfs2_sprintf_system_inode_name(namebuf, 110*ccd979bdSMark Fasheh sizeof(namebuf), 111*ccd979bdSMark Fasheh type, slot); 112*ccd979bdSMark Fasheh 113*ccd979bdSMark Fasheh status = ocfs2_find_files_on_disk(namebuf, strlen(namebuf), 114*ccd979bdSMark Fasheh &blkno, osb->sys_root_inode, 115*ccd979bdSMark Fasheh &dirent_bh, &de); 116*ccd979bdSMark Fasheh if (status < 0) { 117*ccd979bdSMark Fasheh goto bail; 118*ccd979bdSMark Fasheh } 119*ccd979bdSMark Fasheh 120*ccd979bdSMark Fasheh inode = ocfs2_iget(osb, blkno); 121*ccd979bdSMark Fasheh if (IS_ERR(inode)) { 122*ccd979bdSMark Fasheh mlog_errno(PTR_ERR(inode)); 123*ccd979bdSMark Fasheh inode = NULL; 124*ccd979bdSMark Fasheh goto bail; 125*ccd979bdSMark Fasheh } 126*ccd979bdSMark Fasheh bail: 127*ccd979bdSMark Fasheh if (dirent_bh) 128*ccd979bdSMark Fasheh brelse(dirent_bh); 129*ccd979bdSMark Fasheh return inode; 130*ccd979bdSMark Fasheh } 131*ccd979bdSMark Fasheh 132