From ccd979bdbce9fba8412beb3f1de68a9d0171b12c Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Thu, 15 Dec 2005 14:31:24 -0800 Subject: [PATCH] OCFS2: The Second Oracle Cluster Filesystem The OCFS2 file system module. Signed-off-by: Mark Fasheh Signed-off-by: Kurt Hackel --- fs/ocfs2/sysfile.c | 131 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 131 insertions(+) create mode 100644 fs/ocfs2/sysfile.c (limited to 'fs/ocfs2/sysfile.c') diff --git a/fs/ocfs2/sysfile.c b/fs/ocfs2/sysfile.c new file mode 100644 index 00000000000..600a8bc5b54 --- /dev/null +++ b/fs/ocfs2/sysfile.c @@ -0,0 +1,131 @@ +/* -*- 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 +#include +#include +#include + +#include "ocfs2.h" + +#define MLOG_MASK_PREFIX ML_INODE +#include + +#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); + if (!inode) + BUG(); + + 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); + if (!*arr) + BUG(); + } + 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; +} + -- cgit v1.2.3