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11#include <linux/module.h>
12#include <linux/errno.h>
13#include <linux/fs.h>
14#include <linux/file.h>
15#include <linux/pagemap.h>
16#include <linux/stat.h>
17#include <linux/string.h>
18#include <linux/inet.h>
19#include <linux/namei.h>
20#include <linux/idr.h>
21#include <linux/sched.h>
22#include <linux/slab.h>
23#include <net/9p/9p.h>
24#include <net/9p/client.h>
25
26#include "v9fs.h"
27#include "v9fs_vfs.h"
28#include "fid.h"
29
30
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33
34
35static int v9fs_cached_dentry_delete(const struct dentry *dentry)
36{
37 p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
38 dentry, dentry);
39
40
41 if (d_really_is_negative(dentry))
42 return 1;
43 return 0;
44}
45
46
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49
50
51
52static void v9fs_dentry_release(struct dentry *dentry)
53{
54 struct hlist_node *p, *n;
55 p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
56 dentry, dentry);
57 hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata)
58 p9_client_clunk(hlist_entry(p, struct p9_fid, dlist));
59 dentry->d_fsdata = NULL;
60}
61
62static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
63{
64 struct p9_fid *fid;
65 struct inode *inode;
66 struct v9fs_inode *v9inode;
67
68 if (flags & LOOKUP_RCU)
69 return -ECHILD;
70
71 inode = d_inode(dentry);
72 if (!inode)
73 goto out_valid;
74
75 v9inode = V9FS_I(inode);
76 if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) {
77 int retval;
78 struct v9fs_session_info *v9ses;
79 fid = v9fs_fid_lookup(dentry);
80 if (IS_ERR(fid))
81 return PTR_ERR(fid);
82
83 v9ses = v9fs_inode2v9ses(inode);
84 if (v9fs_proto_dotl(v9ses))
85 retval = v9fs_refresh_inode_dotl(fid, inode);
86 else
87 retval = v9fs_refresh_inode(fid, inode);
88 p9_client_clunk(fid);
89
90 if (retval == -ENOENT)
91 return 0;
92 if (retval < 0)
93 return retval;
94 }
95out_valid:
96 return 1;
97}
98
99const struct dentry_operations v9fs_cached_dentry_operations = {
100 .d_revalidate = v9fs_lookup_revalidate,
101 .d_weak_revalidate = v9fs_lookup_revalidate,
102 .d_delete = v9fs_cached_dentry_delete,
103 .d_release = v9fs_dentry_release,
104};
105
106const struct dentry_operations v9fs_dentry_operations = {
107 .d_delete = always_delete_dentry,
108 .d_release = v9fs_dentry_release,
109};
110