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Dropping of last reference to dentry lock is a complicated operation involving dropping of reference to inode. This can get complicated and quota code in particular needs to obtain some quota locks which leads to potential deadlock. Thus we defer dropping of inode reference to ocfs2_wq. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
65 lines
2 KiB
C
65 lines
2 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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* dcache.h
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*
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* Function prototypes
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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 OCFS2_DCACHE_H
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#define OCFS2_DCACHE_H
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extern struct dentry_operations ocfs2_dentry_ops;
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struct ocfs2_dentry_lock {
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/* Use count of dentry lock */
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unsigned int dl_count;
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union {
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/* Linked list of dentry locks to release */
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struct ocfs2_dentry_lock *dl_next;
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u64 dl_parent_blkno;
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};
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/*
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* The ocfs2_dentry_lock keeps an inode reference until
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* dl_lockres has been destroyed. This is usually done in
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* ->d_iput() anyway, so there should be minimal impact.
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*/
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struct inode *dl_inode;
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struct ocfs2_lock_res dl_lockres;
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};
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int ocfs2_dentry_attach_lock(struct dentry *dentry, struct inode *inode,
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u64 parent_blkno);
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void ocfs2_dentry_lock_put(struct ocfs2_super *osb,
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struct ocfs2_dentry_lock *dl);
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void ocfs2_drop_dl_inodes(struct work_struct *work);
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struct dentry *ocfs2_find_local_alias(struct inode *inode, u64 parent_blkno,
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int skip_unhashed);
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void ocfs2_dentry_move(struct dentry *dentry, struct dentry *target,
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struct inode *old_dir, struct inode *new_dir);
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extern spinlock_t dentry_attach_lock;
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#endif /* OCFS2_DCACHE_H */
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