cb25797d45
Add lockdep support to OCFS2. The support also covers all of the cluster locks except for open locks, journal locks, and local quotafile locks. These are special because they are acquired for a node, not for a particular process and lockdep cannot deal with such type of locking. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Joel Becker <joel.becker@oracle.com>
142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* sysfile.c
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*
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* Initialize, read, write, etc. system files.
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*
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* Copyright (C) 2002, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#define MLOG_MASK_PREFIX ML_INODE
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "alloc.h"
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#include "dir.h"
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#include "inode.h"
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#include "journal.h"
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#include "sysfile.h"
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#include "buffer_head_io.h"
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static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
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int type,
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u32 slot);
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static inline int is_global_system_inode(int type);
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static inline int is_in_system_inode_array(struct ocfs2_super *osb,
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int type,
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u32 slot);
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static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES];
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static inline int is_global_system_inode(int type)
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{
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return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE &&
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type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE;
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}
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static inline int is_in_system_inode_array(struct ocfs2_super *osb,
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int type,
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u32 slot)
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{
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return slot == osb->slot_num || is_global_system_inode(type);
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}
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struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb,
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int type,
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u32 slot)
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{
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struct inode *inode = NULL;
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struct inode **arr = NULL;
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/* avoid the lookup if cached in local system file array */
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if (is_in_system_inode_array(osb, type, slot))
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arr = &(osb->system_inodes[type]);
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if (arr && ((inode = *arr) != NULL)) {
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/* get a ref in addition to the array ref */
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inode = igrab(inode);
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BUG_ON(!inode);
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return inode;
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}
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/* this gets one ref thru iget */
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inode = _ocfs2_get_system_file_inode(osb, type, slot);
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/* add one more if putting into array for first time */
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if (arr && inode) {
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*arr = igrab(inode);
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BUG_ON(!*arr);
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}
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return inode;
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}
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static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
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int type,
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u32 slot)
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{
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char namebuf[40];
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struct inode *inode = NULL;
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u64 blkno;
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int status = 0;
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ocfs2_sprintf_system_inode_name(namebuf,
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sizeof(namebuf),
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type, slot);
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status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
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strlen(namebuf), &blkno);
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if (status < 0) {
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goto bail;
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}
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inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type);
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if (IS_ERR(inode)) {
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mlog_errno(PTR_ERR(inode));
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inode = NULL;
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goto bail;
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}
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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if (type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
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type == LOCAL_GROUP_QUOTA_SYSTEM_INODE ||
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type == JOURNAL_SYSTEM_INODE) {
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/* Ignore inode lock on these inodes as the lock does not
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* really belong to any process and lockdep cannot handle
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* that */
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OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL;
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} else {
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lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres.
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l_lockdep_map,
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ocfs2_system_inodes[type].si_name,
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&ocfs2_sysfile_cluster_lock_key[type], 0);
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}
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#endif
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bail:
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return inode;
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}
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