| /* -*- 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> |
| |
| #define MLOG_MASK_PREFIX ML_INODE |
| #include <cluster/masklog.h> |
| |
| #include "ocfs2.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; |
| } |
| |