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Commit | Line | Data |
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e69e7fe5 EVH |
1 | /* |
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 | |
42e8c509 EVH |
10 | * it under the terms of the GNU General Public License version 2 |
11 | * as published by the Free Software Foundation. | |
e69e7fe5 EVH |
12 | * |
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> | |
e69e7fe5 EVH |
33 | #include <linux/inet.h> |
34 | #include <linux/namei.h> | |
35 | #include <linux/idr.h> | |
e8edc6e0 | 36 | #include <linux/sched.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
bd238fb4 LI |
38 | #include <net/9p/9p.h> |
39 | #include <net/9p/client.h> | |
e69e7fe5 | 40 | |
e69e7fe5 | 41 | #include "v9fs.h" |
e69e7fe5 | 42 | #include "v9fs_vfs.h" |
e69e7fe5 EVH |
43 | #include "fid.h" |
44 | ||
45 | /** | |
46f6dac2 EVH |
46 | * v9fs_dentry_delete - called when dentry refcount equals 0 |
47 | * @dentry: dentry in question | |
e69e7fe5 | 48 | * |
46f6dac2 EVH |
49 | * By returning 1 here we should remove cacheing of unused |
50 | * dentry components. | |
e69e7fe5 EVH |
51 | * |
52 | */ | |
53 | ||
fe15ce44 | 54 | static int v9fs_dentry_delete(const struct dentry *dentry) |
e69e7fe5 | 55 | { |
5d385153 JP |
56 | p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n", |
57 | dentry->d_name.name, dentry); | |
e03abc0c | 58 | |
46f6dac2 | 59 | return 1; |
e69e7fe5 EVH |
60 | } |
61 | ||
e03abc0c EVH |
62 | /** |
63 | * v9fs_cached_dentry_delete - called when dentry refcount equals 0 | |
64 | * @dentry: dentry in question | |
65 | * | |
e03abc0c | 66 | */ |
fe15ce44 | 67 | static int v9fs_cached_dentry_delete(const struct dentry *dentry) |
e03abc0c | 68 | { |
5d385153 JP |
69 | p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n", |
70 | dentry->d_name.name, dentry); | |
e03abc0c | 71 | |
a950a652 AK |
72 | /* Don't cache negative dentries */ |
73 | if (!dentry->d_inode) | |
e03abc0c | 74 | return 1; |
e03abc0c EVH |
75 | return 0; |
76 | } | |
77 | ||
e69e7fe5 EVH |
78 | /** |
79 | * v9fs_dentry_release - called when dentry is going to be freed | |
80 | * @dentry: dentry that is being release | |
81 | * | |
82 | */ | |
83 | ||
98cd3fb0 | 84 | static void v9fs_dentry_release(struct dentry *dentry) |
e69e7fe5 | 85 | { |
aaeb7ecf | 86 | struct hlist_node *p, *n; |
5d385153 JP |
87 | p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n", |
88 | dentry->d_name.name, dentry); | |
aaeb7ecf AV |
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; | |
e69e7fe5 EVH |
92 | } |
93 | ||
0b728e19 | 94 | static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
b3cbea03 AK |
95 | { |
96 | struct p9_fid *fid; | |
97 | struct inode *inode; | |
98 | struct v9fs_inode *v9inode; | |
99 | ||
0b728e19 | 100 | if (flags & LOOKUP_RCU) |
b3cbea03 AK |
101 | 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); | |
f2eda2c6 AK |
120 | if (retval == -ENOENT) |
121 | return 0; | |
122 | if (retval < 0) | |
b3cbea03 AK |
123 | return retval; |
124 | } | |
125 | out_valid: | |
126 | return 1; | |
127 | } | |
128 | ||
a488257c | 129 | const struct dentry_operations v9fs_cached_dentry_operations = { |
b3cbea03 | 130 | .d_revalidate = v9fs_lookup_revalidate, |
ecf3d1f1 | 131 | .d_weak_revalidate = v9fs_lookup_revalidate, |
e03abc0c EVH |
132 | .d_delete = v9fs_cached_dentry_delete, |
133 | .d_release = v9fs_dentry_release, | |
134 | }; | |
135 | ||
a488257c | 136 | const struct dentry_operations v9fs_dentry_operations = { |
46f6dac2 | 137 | .d_delete = v9fs_dentry_delete, |
e69e7fe5 EVH |
138 | .d_release = v9fs_dentry_release, |
139 | }; |