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d680efe9d8
Replace the dentry vote mechanism with a cluster lock which covers a set of dentries. This allows us to force d_delete() only on nodes which actually care about an unlink. Every node that does a ->lookup() gets a read only lock on the dentry, until an unlink during which the unlinking node, will request an exclusive lock, forcing the other nodes who care about that dentry to d_delete() it. The effect is that we retain a very lightweight ->d_revalidate(), and at the same time get to make large improvements to the average case performance of the ocfs2 unlink and rename operations. This patch adds the cluster lock type which OCFS2 can attach to dentries. A small number of fs/ocfs2/dcache.c functions are stubbed out so that this change can compile. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
124 lines
4.3 KiB
C
124 lines
4.3 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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* dlmglue.h
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*
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* description here
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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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#ifndef DLMGLUE_H
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#define DLMGLUE_H
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#include "dcache.h"
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#define OCFS2_LVB_VERSION 3
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struct ocfs2_meta_lvb {
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__be32 lvb_version;
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__be32 lvb_iclusters;
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__be32 lvb_iuid;
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__be32 lvb_igid;
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__be64 lvb_iatime_packed;
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__be64 lvb_ictime_packed;
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__be64 lvb_imtime_packed;
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__be64 lvb_isize;
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__be16 lvb_imode;
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__be16 lvb_inlink;
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__be32 lvb_iattr;
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__be32 lvb_reserved[2];
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};
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/* ocfs2_meta_lock_full() and ocfs2_data_lock_full() 'arg_flags' flags */
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/* don't wait on recovery. */
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#define OCFS2_META_LOCK_RECOVERY (0x01)
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/* Instruct the dlm not to queue ourselves on the other node. */
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#define OCFS2_META_LOCK_NOQUEUE (0x02)
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/* don't block waiting for the vote thread, instead return -EAGAIN */
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#define OCFS2_LOCK_NONBLOCK (0x04)
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int ocfs2_dlm_init(struct ocfs2_super *osb);
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void ocfs2_dlm_shutdown(struct ocfs2_super *osb);
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void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res);
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void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
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enum ocfs2_lock_type type,
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struct inode *inode);
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void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
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u64 parent, struct inode *inode);
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void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
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int ocfs2_create_new_inode_locks(struct inode *inode);
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int ocfs2_create_new_lock(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres, int ex);
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int ocfs2_drop_inode_locks(struct inode *inode);
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int ocfs2_data_lock_full(struct inode *inode,
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int write,
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int arg_flags);
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#define ocfs2_data_lock(inode, write) ocfs2_data_lock_full(inode, write, 0)
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int ocfs2_data_lock_with_page(struct inode *inode,
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int write,
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struct page *page);
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void ocfs2_data_unlock(struct inode *inode,
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int write);
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int ocfs2_rw_lock(struct inode *inode, int write);
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void ocfs2_rw_unlock(struct inode *inode, int write);
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int ocfs2_meta_lock_full(struct inode *inode,
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struct ocfs2_journal_handle *handle,
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struct buffer_head **ret_bh,
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int ex,
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int arg_flags);
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int ocfs2_meta_lock_with_page(struct inode *inode,
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struct ocfs2_journal_handle *handle,
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struct buffer_head **ret_bh,
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int ex,
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struct page *page);
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/* 99% of the time we don't want to supply any additional flags --
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* those are for very specific cases only. */
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#define ocfs2_meta_lock(i, h, b, e) ocfs2_meta_lock_full(i, h, b, e, 0)
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void ocfs2_meta_unlock(struct inode *inode,
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int ex);
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int ocfs2_super_lock(struct ocfs2_super *osb,
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int ex);
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void ocfs2_super_unlock(struct ocfs2_super *osb,
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int ex);
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int ocfs2_rename_lock(struct ocfs2_super *osb);
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void ocfs2_rename_unlock(struct ocfs2_super *osb);
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int ocfs2_dentry_lock(struct dentry *dentry, int ex);
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void ocfs2_dentry_unlock(struct dentry *dentry, int ex);
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void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres);
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void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres);
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/* for the vote thread */
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void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
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struct ocfs2_lock_res *lockres);
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struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void);
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void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug);
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/* aids in debugging and tracking lvbs */
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void ocfs2_dump_meta_lvb_info(u64 level,
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const char *function,
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unsigned int line,
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struct ocfs2_lock_res *lockres);
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#define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres)
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#endif /* DLMGLUE_H */
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