Commit | Line | Data |
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1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e69e7fe5 | 2 | /* |
e69e7fe5 EVH |
3 | * This file contians vfs dentry ops for the 9P2000 protocol. |
4 | * | |
5 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
6 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
e69e7fe5 EVH |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/errno.h> | |
11 | #include <linux/fs.h> | |
12 | #include <linux/file.h> | |
13 | #include <linux/pagemap.h> | |
14 | #include <linux/stat.h> | |
15 | #include <linux/string.h> | |
e69e7fe5 | 16 | #include <linux/namei.h> |
e8edc6e0 | 17 | #include <linux/sched.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
bd238fb4 LI |
19 | #include <net/9p/9p.h> |
20 | #include <net/9p/client.h> | |
e69e7fe5 | 21 | |
e69e7fe5 | 22 | #include "v9fs.h" |
e69e7fe5 | 23 | #include "v9fs_vfs.h" |
e69e7fe5 EVH |
24 | #include "fid.h" |
25 | ||
e03abc0c EVH |
26 | /** |
27 | * v9fs_cached_dentry_delete - called when dentry refcount equals 0 | |
28 | * @dentry: dentry in question | |
29 | * | |
e03abc0c | 30 | */ |
fe15ce44 | 31 | static int v9fs_cached_dentry_delete(const struct dentry *dentry) |
e03abc0c | 32 | { |
4b8e9923 AV |
33 | p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n", |
34 | dentry, dentry); | |
e03abc0c | 35 | |
a950a652 | 36 | /* Don't cache negative dentries */ |
2b0143b5 | 37 | if (d_really_is_negative(dentry)) |
e03abc0c | 38 | return 1; |
e03abc0c EVH |
39 | return 0; |
40 | } | |
41 | ||
e69e7fe5 EVH |
42 | /** |
43 | * v9fs_dentry_release - called when dentry is going to be freed | |
44 | * @dentry: dentry that is being release | |
45 | * | |
46 | */ | |
47 | ||
98cd3fb0 | 48 | static void v9fs_dentry_release(struct dentry *dentry) |
e69e7fe5 | 49 | { |
aaeb7ecf | 50 | struct hlist_node *p, *n; |
6e195b0f | 51 | |
4b8e9923 AV |
52 | p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n", |
53 | dentry, dentry); | |
aaeb7ecf | 54 | hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata) |
b48dbb99 | 55 | p9_fid_put(hlist_entry(p, struct p9_fid, dlist)); |
aaeb7ecf | 56 | dentry->d_fsdata = NULL; |
e69e7fe5 EVH |
57 | } |
58 | ||
0b728e19 | 59 | static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
b3cbea03 AK |
60 | { |
61 | struct p9_fid *fid; | |
62 | struct inode *inode; | |
63 | struct v9fs_inode *v9inode; | |
64 | ||
0b728e19 | 65 | if (flags & LOOKUP_RCU) |
b3cbea03 AK |
66 | return -ECHILD; |
67 | ||
2b0143b5 | 68 | inode = d_inode(dentry); |
b3cbea03 AK |
69 | if (!inode) |
70 | goto out_valid; | |
71 | ||
72 | v9inode = V9FS_I(inode); | |
73 | if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) { | |
74 | int retval; | |
75 | struct v9fs_session_info *v9ses; | |
6e195b0f | 76 | |
b3cbea03 AK |
77 | fid = v9fs_fid_lookup(dentry); |
78 | if (IS_ERR(fid)) | |
79 | return PTR_ERR(fid); | |
80 | ||
81 | v9ses = v9fs_inode2v9ses(inode); | |
82 | if (v9fs_proto_dotl(v9ses)) | |
83 | retval = v9fs_refresh_inode_dotl(fid, inode); | |
84 | else | |
85 | retval = v9fs_refresh_inode(fid, inode); | |
b48dbb99 | 86 | p9_fid_put(fid); |
6636b6dc | 87 | |
f2eda2c6 AK |
88 | if (retval == -ENOENT) |
89 | return 0; | |
90 | if (retval < 0) | |
b3cbea03 AK |
91 | return retval; |
92 | } | |
93 | out_valid: | |
94 | return 1; | |
95 | } | |
96 | ||
a488257c | 97 | const struct dentry_operations v9fs_cached_dentry_operations = { |
b3cbea03 | 98 | .d_revalidate = v9fs_lookup_revalidate, |
ecf3d1f1 | 99 | .d_weak_revalidate = v9fs_lookup_revalidate, |
e03abc0c EVH |
100 | .d_delete = v9fs_cached_dentry_delete, |
101 | .d_release = v9fs_dentry_release, | |
102 | }; | |
103 | ||
a488257c | 104 | const struct dentry_operations v9fs_dentry_operations = { |
b26d4cd3 | 105 | .d_delete = always_delete_dentry, |
e69e7fe5 EVH |
106 | .d_release = v9fs_dentry_release, |
107 | }; |