forked from luck/tmp_suning_uos_patched
140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
/*
|
|
* 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
|
|
* it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* 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>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <net/9p/9p.h>
|
|
#include <net/9p/client.h>
|
|
|
|
#include "v9fs.h"
|
|
#include "v9fs_vfs.h"
|
|
#include "fid.h"
|
|
|
|
/**
|
|
* v9fs_dentry_delete - called when dentry refcount equals 0
|
|
* @dentry: dentry in question
|
|
*
|
|
* By returning 1 here we should remove cacheing of unused
|
|
* dentry components.
|
|
*
|
|
*/
|
|
|
|
static int v9fs_dentry_delete(const struct dentry *dentry)
|
|
{
|
|
p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n",
|
|
dentry->d_name.name, dentry);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* v9fs_cached_dentry_delete - called when dentry refcount equals 0
|
|
* @dentry: dentry in question
|
|
*
|
|
*/
|
|
static int v9fs_cached_dentry_delete(const struct dentry *dentry)
|
|
{
|
|
p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n",
|
|
dentry->d_name.name, dentry);
|
|
|
|
/* Don't cache negative dentries */
|
|
if (!dentry->d_inode)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_dentry_release - called when dentry is going to be freed
|
|
* @dentry: dentry that is being release
|
|
*
|
|
*/
|
|
|
|
static void v9fs_dentry_release(struct dentry *dentry)
|
|
{
|
|
struct hlist_node *p, *n;
|
|
p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n",
|
|
dentry->d_name.name, dentry);
|
|
hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata)
|
|
p9_client_clunk(hlist_entry(p, struct p9_fid, dlist));
|
|
dentry->d_fsdata = NULL;
|
|
}
|
|
|
|
static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
|
|
{
|
|
struct p9_fid *fid;
|
|
struct inode *inode;
|
|
struct v9fs_inode *v9inode;
|
|
|
|
if (flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
inode = dentry->d_inode;
|
|
if (!inode)
|
|
goto out_valid;
|
|
|
|
v9inode = V9FS_I(inode);
|
|
if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) {
|
|
int retval;
|
|
struct v9fs_session_info *v9ses;
|
|
fid = v9fs_fid_lookup(dentry);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
v9ses = v9fs_inode2v9ses(inode);
|
|
if (v9fs_proto_dotl(v9ses))
|
|
retval = v9fs_refresh_inode_dotl(fid, inode);
|
|
else
|
|
retval = v9fs_refresh_inode(fid, inode);
|
|
if (retval == -ENOENT)
|
|
return 0;
|
|
if (retval < 0)
|
|
return retval;
|
|
}
|
|
out_valid:
|
|
return 1;
|
|
}
|
|
|
|
const struct dentry_operations v9fs_cached_dentry_operations = {
|
|
.d_revalidate = v9fs_lookup_revalidate,
|
|
.d_weak_revalidate = v9fs_lookup_revalidate,
|
|
.d_delete = v9fs_cached_dentry_delete,
|
|
.d_release = v9fs_dentry_release,
|
|
};
|
|
|
|
const struct dentry_operations v9fs_dentry_operations = {
|
|
.d_delete = v9fs_dentry_delete,
|
|
.d_release = v9fs_dentry_release,
|
|
};
|