2 * linux/fs/9p/vfs_dentry.c
4 * This file contians vfs dentry ops for the 9P2000 protocol.
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
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.
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
26 #include <linux/module.h>
27 #include <linux/errno.h>
29 #include <linux/file.h>
30 #include <linux/pagemap.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/inet.h>
34 #include <linux/namei.h>
35 #include <linux/idr.h>
36 #include <linux/sched.h>
37 #include <linux/slab.h>
38 #include <net/9p/9p.h>
39 #include <net/9p/client.h>
46 * v9fs_dentry_delete - called when dentry refcount equals 0
47 * @dentry: dentry in question
49 * By returning 1 here we should remove cacheing of unused
54 static int v9fs_dentry_delete(const struct dentry *dentry)
56 p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n",
57 dentry->d_name.name, dentry);
63 * v9fs_cached_dentry_delete - called when dentry refcount equals 0
64 * @dentry: dentry in question
67 static int v9fs_cached_dentry_delete(const struct dentry *dentry)
69 p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n",
70 dentry->d_name.name, dentry);
72 /* Don't cache negative dentries */
79 * v9fs_dentry_release - called when dentry is going to be freed
80 * @dentry: dentry that is being release
84 static void v9fs_dentry_release(struct dentry *dentry)
86 struct hlist_node *p, *n;
87 p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n",
88 dentry->d_name.name, dentry);
89 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;
94 static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
98 struct v9fs_inode *v9inode;
100 if (flags & LOOKUP_RCU)
103 inode = dentry->d_inode;
107 v9inode = V9FS_I(inode);
108 if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) {
110 struct v9fs_session_info *v9ses;
111 fid = v9fs_fid_lookup(dentry);
115 v9ses = v9fs_inode2v9ses(inode);
116 if (v9fs_proto_dotl(v9ses))
117 retval = v9fs_refresh_inode_dotl(fid, inode);
119 retval = v9fs_refresh_inode(fid, inode);
120 if (retval == -ENOENT)
129 const struct dentry_operations v9fs_cached_dentry_operations = {
130 .d_revalidate = v9fs_lookup_revalidate,
131 .d_weak_revalidate = v9fs_lookup_revalidate,
132 .d_delete = v9fs_cached_dentry_delete,
133 .d_release = v9fs_dentry_release,
136 const struct dentry_operations v9fs_dentry_operations = {
137 .d_delete = v9fs_dentry_delete,
138 .d_release = v9fs_dentry_release,