1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
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> |
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> |
16 | #include <linux/namei.h> |
17 | #include <linux/sched.h> |
18 | #include <linux/slab.h> |
19 | #include <net/9p/9p.h> |
20 | #include <net/9p/client.h> |
21 | |
22 | #include "v9fs.h" |
23 | #include "v9fs_vfs.h" |
24 | #include "fid.h" |
25 | |
26 | /** |
27 | * v9fs_cached_dentry_delete - called when dentry refcount equals 0 |
28 | * @dentry: dentry in question |
29 | * |
30 | */ |
31 | static int v9fs_cached_dentry_delete(const struct dentry *dentry) |
32 | { |
33 | p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n" , |
34 | dentry, dentry); |
35 | |
36 | /* Don't cache negative dentries */ |
37 | if (d_really_is_negative(dentry)) |
38 | return 1; |
39 | return 0; |
40 | } |
41 | |
42 | /** |
43 | * v9fs_dentry_release - called when dentry is going to be freed |
44 | * @dentry: dentry that is being release |
45 | * |
46 | */ |
47 | |
48 | static void v9fs_dentry_release(struct dentry *dentry) |
49 | { |
50 | struct hlist_node *p, *n; |
51 | |
52 | p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n" , |
53 | dentry, dentry); |
54 | hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata) |
55 | p9_fid_put(hlist_entry(p, struct p9_fid, dlist)); |
56 | dentry->d_fsdata = NULL; |
57 | } |
58 | |
59 | static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags) |
60 | { |
61 | struct p9_fid *fid; |
62 | struct inode *inode; |
63 | struct v9fs_inode *v9inode; |
64 | |
65 | if (flags & LOOKUP_RCU) |
66 | return -ECHILD; |
67 | |
68 | inode = d_inode(dentry); |
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; |
76 | |
77 | fid = v9fs_fid_lookup(dentry); |
78 | if (IS_ERR(ptr: fid)) |
79 | return PTR_ERR(ptr: 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); |
86 | p9_fid_put(fid); |
87 | |
88 | if (retval == -ENOENT) |
89 | return 0; |
90 | if (retval < 0) |
91 | return retval; |
92 | } |
93 | out_valid: |
94 | return 1; |
95 | } |
96 | |
97 | const struct dentry_operations v9fs_cached_dentry_operations = { |
98 | .d_revalidate = v9fs_lookup_revalidate, |
99 | .d_weak_revalidate = v9fs_lookup_revalidate, |
100 | .d_delete = v9fs_cached_dentry_delete, |
101 | .d_release = v9fs_dentry_release, |
102 | }; |
103 | |
104 | const struct dentry_operations v9fs_dentry_operations = { |
105 | .d_delete = always_delete_dentry, |
106 | .d_release = v9fs_dentry_release, |
107 | }; |
108 | |