/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * sysfile.c * * Initialize, read, write, etc. system files. * * Copyright (C) 2002, 2004 Oracle. All rights reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. */ #include <linux/fs.h> #include <linux/types.h> #include <linux/slab.h> #include <linux/highmem.h> #include "ocfs2.h" #define MLOG_MASK_PREFIX ML_INODE #include <cluster/masklog.h> #include "alloc.h" #include "dir.h" #include "inode.h" #include "journal.h" #include "sysfile.h" #include "buffer_head_io.h" static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, int type, u32 slot); static inline int is_global_system_inode(int type); static inline int is_in_system_inode_array(struct ocfs2_super *osb, int type, u32 slot); static inline int is_global_system_inode(int type) { return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE && type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; } static inline int is_in_system_inode_array(struct ocfs2_super *osb, int type, u32 slot) { return slot == osb->slot_num || is_global_system_inode(type); } struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb, int type, u32 slot) { struct inode *inode = NULL; struct inode **arr = NULL; /* avoid the lookup if cached in local system file array */ if (is_in_system_inode_array(osb, type, slot)) arr = &(osb->system_inodes[type]); if (arr && ((inode = *arr) != NULL)) { /* get a ref in addition to the array ref */ inode = igrab(inode); BUG_ON(!inode); return inode; } /* this gets one ref thru iget */ inode = _ocfs2_get_system_file_inode(osb, type, slot); /* add one more if putting into array for first time */ if (arr && inode) { *arr = igrab(inode); BUG_ON(!*arr); } return inode; } static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, int type, u32 slot) { char namebuf[40]; struct inode *inode = NULL; u64 blkno; struct buffer_head *dirent_bh = NULL; struct ocfs2_dir_entry *de = NULL; int status = 0; ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, slot); status = ocfs2_find_files_on_disk(namebuf, strlen(namebuf), &blkno, osb->sys_root_inode, &dirent_bh, &de); if (status < 0) { goto bail; } inode = ocfs2_iget(osb, blkno); if (IS_ERR(inode)) { mlog_errno(PTR_ERR(inode)); inode = NULL; goto bail; } bail: if (dirent_bh) brelse(dirent_bh); return inode; }