forked from Minki/linux
24c19ef404
OCFS2 puts inode meta data in the "lock value block" provided by the DLM. Typically, i_generation is encoded in the lock name so that a deleted inode on and a new one in the same block don't share the same lvb. Unfortunately, that scheme means that the read in ocfs2_read_locked_inode() is potentially thrown away as soon as the meta data lock is taken - we cannot encode the lock name without first knowing i_generation, which requires a disk read. This patch encodes i_generation in the inode meta data lvb, and removes the value from the inode meta data lock name. This way, the read can be covered by a lock, and at the same time we can distinguish between an up to date and a stale LVB. This will help cold-cache stat(2) performance in particular. Since this patch changes the protocol version, we take the opportunity to do a minor re-organization of two of the LVB fields. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
128 lines
4.4 KiB
C
128 lines
4.4 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 4
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struct ocfs2_meta_lvb {
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__u8 lvb_version;
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__u8 lvb_reserved0;
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__be16 lvb_reserved1;
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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_igeneration;
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__be32 lvb_reserved2;
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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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unsigned int generation,
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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, int local);
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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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