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_DPRINTK(P9_DEBUG_VFS
, " dentry: %s (%p)\n", dentry
->d_name
.name
,
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_DPRINTK(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 v9fs_dentry
*dent
;
87 struct p9_fid
*temp
, *current_fid
;
89 P9_DPRINTK(P9_DEBUG_VFS
, " dentry: %s (%p)\n", dentry
->d_name
.name
,
91 dent
= dentry
->d_fsdata
;
93 list_for_each_entry_safe(current_fid
, temp
, &dent
->fidlist
,
95 p9_client_clunk(current_fid
);
99 dentry
->d_fsdata
= NULL
;
103 static int v9fs_lookup_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
107 struct v9fs_inode
*v9inode
;
109 if (nd
->flags
& LOOKUP_RCU
)
112 inode
= dentry
->d_inode
;
116 v9inode
= V9FS_I(inode
);
117 if (v9inode
->cache_validity
& V9FS_INO_INVALID_ATTR
) {
119 struct v9fs_session_info
*v9ses
;
120 fid
= v9fs_fid_lookup(dentry
);
124 v9ses
= v9fs_inode2v9ses(inode
);
125 if (v9fs_proto_dotl(v9ses
))
126 retval
= v9fs_refresh_inode_dotl(fid
, inode
);
128 retval
= v9fs_refresh_inode(fid
, inode
);
136 const struct dentry_operations v9fs_cached_dentry_operations
= {
137 .d_revalidate
= v9fs_lookup_revalidate
,
138 .d_delete
= v9fs_cached_dentry_delete
,
139 .d_release
= v9fs_dentry_release
,
142 const struct dentry_operations v9fs_dentry_operations
= {
143 .d_delete
= v9fs_dentry_delete
,
144 .d_release
= v9fs_dentry_release
,