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Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -07001/*
2 * linux/fs/9p/vfs_dentry.c
3 *
4 * This file contians vfs dentry ops for the 9P2000 protocol.
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
Eric Van Hensbergen42e8c502006-03-25 03:07:28 -080010 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070012 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
29#include <linux/file.h>
30#include <linux/pagemap.h>
31#include <linux/stat.h>
32#include <linux/string.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070033#include <linux/inet.h>
34#include <linux/namei.h>
35#include <linux/idr.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040036#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050038#include <net/9p/9p.h>
39#include <net/9p/client.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070040
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070041#include "v9fs.h"
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070042#include "v9fs_vfs.h"
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070043#include "fid.h"
44
45/**
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060046 * v9fs_cached_dentry_delete - called when dentry refcount equals 0
47 * @dentry: dentry in question
48 *
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060049 */
Nick Pigginfe15ce42011-01-07 17:49:23 +110050static int v9fs_cached_dentry_delete(const struct dentry *dentry)
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060051{
Al Viro4b8e9922014-08-19 20:17:38 -040052 p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
53 dentry, dentry);
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060054
Aneesh Kumar K.Va950a652011-02-28 17:03:58 +053055 /* Don't cache negative dentries */
56 if (!dentry->d_inode)
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060057 return 1;
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060058 return 0;
59}
60
61/**
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070062 * v9fs_dentry_release - called when dentry is going to be freed
63 * @dentry: dentry that is being release
64 *
65 */
66
Al Viro98cd3fb2011-01-12 17:10:55 -050067static void v9fs_dentry_release(struct dentry *dentry)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070068{
Al Viroaaeb7ec2013-02-28 01:13:19 -050069 struct hlist_node *p, *n;
Al Viro4b8e9922014-08-19 20:17:38 -040070 p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
71 dentry, dentry);
Al Viroaaeb7ec2013-02-28 01:13:19 -050072 hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata)
73 p9_client_clunk(hlist_entry(p, struct p9_fid, dlist));
74 dentry->d_fsdata = NULL;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070075}
76
Al Viro0b728e12012-06-10 16:03:43 -040077static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +053078{
79 struct p9_fid *fid;
80 struct inode *inode;
81 struct v9fs_inode *v9inode;
82
Al Viro0b728e12012-06-10 16:03:43 -040083 if (flags & LOOKUP_RCU)
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +053084 return -ECHILD;
85
86 inode = dentry->d_inode;
87 if (!inode)
88 goto out_valid;
89
90 v9inode = V9FS_I(inode);
91 if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) {
92 int retval;
93 struct v9fs_session_info *v9ses;
94 fid = v9fs_fid_lookup(dentry);
95 if (IS_ERR(fid))
96 return PTR_ERR(fid);
97
98 v9ses = v9fs_inode2v9ses(inode);
99 if (v9fs_proto_dotl(v9ses))
100 retval = v9fs_refresh_inode_dotl(fid, inode);
101 else
102 retval = v9fs_refresh_inode(fid, inode);
Aneesh Kumar K.Vf2eda2c2011-03-23 19:48:16 +0530103 if (retval == -ENOENT)
104 return 0;
105 if (retval < 0)
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +0530106 return retval;
107 }
108out_valid:
109 return 1;
110}
111
Al Viroa488257c2009-02-20 05:55:46 +0000112const struct dentry_operations v9fs_cached_dentry_operations = {
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +0530113 .d_revalidate = v9fs_lookup_revalidate,
Jeff Laytonecf3d1f2013-02-20 11:19:05 -0500114 .d_weak_revalidate = v9fs_lookup_revalidate,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600115 .d_delete = v9fs_cached_dentry_delete,
116 .d_release = v9fs_dentry_release,
117};
118
Al Viroa488257c2009-02-20 05:55:46 +0000119const struct dentry_operations v9fs_dentry_operations = {
Al Virob26d4cd2013-10-25 18:47:37 -0400120 .d_delete = always_delete_dentry,
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700121 .d_release = v9fs_dentry_release,
122};