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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 Hensbergen46f6dac2006-03-02 02:54:33 -080046 * v9fs_dentry_delete - called when dentry refcount equals 0
47 * @dentry: dentry in question
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070048 *
Eric Van Hensbergen46f6dac2006-03-02 02:54:33 -080049 * By returning 1 here we should remove cacheing of unused
50 * dentry components.
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070051 *
52 */
53
Nick Pigginfe15ce42011-01-07 17:49:23 +110054static int v9fs_dentry_delete(const struct dentry *dentry)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070055{
Joe Perches5d385152011-11-28 10:40:46 -080056 p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n",
57 dentry->d_name.name, dentry);
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060058
Eric Van Hensbergen46f6dac2006-03-02 02:54:33 -080059 return 1;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070060}
61
62/**
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060063 * v9fs_cached_dentry_delete - called when dentry refcount equals 0
64 * @dentry: dentry in question
65 *
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060066 */
Nick Pigginfe15ce42011-01-07 17:49:23 +110067static int v9fs_cached_dentry_delete(const struct dentry *dentry)
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060068{
Joe Perches5d385152011-11-28 10:40:46 -080069 p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n",
70 dentry->d_name.name, dentry);
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060071
Aneesh Kumar K.Va950a652011-02-28 17:03:58 +053072 /* Don't cache negative dentries */
73 if (!dentry->d_inode)
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060074 return 1;
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060075 return 0;
76}
77
78/**
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070079 * v9fs_dentry_release - called when dentry is going to be freed
80 * @dentry: dentry that is being release
81 *
82 */
83
Al Viro98cd3fb2011-01-12 17:10:55 -050084static void v9fs_dentry_release(struct dentry *dentry)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070085{
Al Viroaaeb7ec2013-02-28 01:13:19 -050086 struct hlist_node *p, *n;
Joe Perches5d385152011-11-28 10:40:46 -080087 p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n",
88 dentry->d_name.name, dentry);
Al Viroaaeb7ec2013-02-28 01:13:19 -050089 hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata)
90 p9_client_clunk(hlist_entry(p, struct p9_fid, dlist));
91 dentry->d_fsdata = NULL;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070092}
93
Al Viro0b728e12012-06-10 16:03:43 -040094static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +053095{
96 struct p9_fid *fid;
97 struct inode *inode;
98 struct v9fs_inode *v9inode;
99
Al Viro0b728e12012-06-10 16:03:43 -0400100 if (flags & LOOKUP_RCU)
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +0530101 return -ECHILD;
102
103 inode = dentry->d_inode;
104 if (!inode)
105 goto out_valid;
106
107 v9inode = V9FS_I(inode);
108 if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) {
109 int retval;
110 struct v9fs_session_info *v9ses;
111 fid = v9fs_fid_lookup(dentry);
112 if (IS_ERR(fid))
113 return PTR_ERR(fid);
114
115 v9ses = v9fs_inode2v9ses(inode);
116 if (v9fs_proto_dotl(v9ses))
117 retval = v9fs_refresh_inode_dotl(fid, inode);
118 else
119 retval = v9fs_refresh_inode(fid, inode);
Aneesh Kumar K.Vf2eda2c2011-03-23 19:48:16 +0530120 if (retval == -ENOENT)
121 return 0;
122 if (retval < 0)
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +0530123 return retval;
124 }
125out_valid:
126 return 1;
127}
128
Al Viroa488257c2009-02-20 05:55:46 +0000129const struct dentry_operations v9fs_cached_dentry_operations = {
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +0530130 .d_revalidate = v9fs_lookup_revalidate,
Jeff Laytonecf3d1f2013-02-20 11:19:05 -0500131 .d_weak_revalidate = v9fs_lookup_revalidate,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600132 .d_delete = v9fs_cached_dentry_delete,
133 .d_release = v9fs_dentry_release,
134};
135
Al Viroa488257c2009-02-20 05:55:46 +0000136const struct dentry_operations v9fs_dentry_operations = {
Eric Van Hensbergen46f6dac2006-03-02 02:54:33 -0800137 .d_delete = v9fs_dentry_delete,
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700138 .d_release = v9fs_dentry_release,
139};