vfs_dentry.c 2.9 KB
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/*
 *  linux/fs/9p/vfs_dentry.c
 *
 * This file contians vfs dentry ops for the 9P2000 protocol.
 *
 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
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 *
 *  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:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/pagemap.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/inet.h>
#include <linux/namei.h>
#include <linux/idr.h>
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Alexey Dobriyan 已提交
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <net/9p/9p.h>
#include <net/9p/client.h>
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#include "v9fs.h"
#include "v9fs_vfs.h"
#include "fid.h"

/**
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 * v9fs_dentry_delete - called when dentry refcount equals 0
 * @dentry:  dentry in question
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 *
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 * By returning 1 here we should remove cacheing of unused
 * dentry components.
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 *
 */

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Nick Piggin 已提交
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static int v9fs_dentry_delete(const struct dentry *dentry)
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{
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	P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
									dentry);
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	return 1;
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}

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/**
 * v9fs_cached_dentry_delete - called when dentry refcount equals 0
 * @dentry:  dentry in question
 *
 * Only return 1 if our inode is invalid.  Only non-synthetic files
 * (ones without mtime == 0) should be calling this function.
 *
 */

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Nick Piggin 已提交
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static int v9fs_cached_dentry_delete(const struct dentry *dentry)
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{
	struct inode *inode = dentry->d_inode;
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	P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
									dentry);
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	if(!inode)
		return 1;

	return 0;
}

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/**
 * v9fs_dentry_release - called when dentry is going to be freed
 * @dentry:  dentry that is being release
 *
 */

void v9fs_dentry_release(struct dentry *dentry)
{
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	struct v9fs_dentry *dent;
	struct p9_fid *temp, *current_fid;

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	P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
									dentry);
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	dent = dentry->d_fsdata;
	if (dent) {
		list_for_each_entry_safe(current_fid, temp, &dent->fidlist,
									dlist) {
			p9_client_clunk(current_fid);
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		}

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		kfree(dent);
		dentry->d_fsdata = NULL;
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	}
}

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Al Viro 已提交
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const struct dentry_operations v9fs_cached_dentry_operations = {
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	.d_delete = v9fs_cached_dentry_delete,
	.d_release = v9fs_dentry_release,
};

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Al Viro 已提交
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const struct dentry_operations v9fs_dentry_operations = {
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	.d_delete = v9fs_dentry_delete,
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	.d_release = v9fs_dentry_release,
};