1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 /*
3 * Copyright (C) 2024 Mike Snitzer <snitzer@ha
4 * Copyright (C) 2024 NeilBrown <neilb@suse.de
5 */
6 #ifndef __LINUX_NFSLOCALIO_H
7 #define __LINUX_NFSLOCALIO_H
8
9 /* nfsd_file structure is purposely kept opaqu
10 struct nfsd_file;
11
12 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
13
14 #include <linux/module.h>
15 #include <linux/list.h>
16 #include <linux/uuid.h>
17 #include <linux/sunrpc/clnt.h>
18 #include <linux/sunrpc/svcauth.h>
19 #include <linux/nfs.h>
20 #include <net/net_namespace.h>
21
22 /*
23 * Useful to allow a client to negotiate if lo
24 * possible with its server.
25 *
26 * See Documentation/filesystems/nfs/localio.r
27 */
28 typedef struct {
29 uuid_t uuid;
30 struct list_head list;
31 struct net __rcu *net; /* nfsd's netwo
32 struct auth_domain *dom; /* auth_domai
33 } nfs_uuid_t;
34
35 void nfs_uuid_init(nfs_uuid_t *);
36 bool nfs_uuid_begin(nfs_uuid_t *);
37 void nfs_uuid_end(nfs_uuid_t *);
38 void nfs_uuid_is_local(const uuid_t *, struct
39 struct net *, struct au
40 void nfs_uuid_invalidate_clients(struct list_h
41 void nfs_uuid_invalidate_one_client(nfs_uuid_t
42
43 /* localio needs to map filehandle -> struct n
44 extern struct nfsd_file *
45 nfsd_open_local_fh(struct net *, struct auth_d
46 const struct cred *, const
47 const fmode_t) __must_hold(
48
49 struct nfsd_localio_operations {
50 bool (*nfsd_serv_try_get)(struct net *
51 void (*nfsd_serv_put)(struct net *);
52 struct nfsd_file *(*nfsd_open_local_fh
53
54
55
56
57
58 void (*nfsd_file_put_local)(struct nfs
59 struct file *(*nfsd_file_file)(struct
60 } ____cacheline_aligned;
61
62 extern void nfsd_localio_ops_init(void);
63 extern const struct nfsd_localio_operations *n
64
65 struct nfsd_file *nfs_open_local_fh(nfs_uuid_t
66 struct rpc_clnt *, const st
67 const struct nfs_fh *, cons
68
69 static inline void nfs_to_nfsd_file_put_local(
70 {
71 /*
72 * Once reference to nfsd_serv is drop
73 * unloaded, so ensure safe return fro
74 * by always taking RCU.
75 */
76 rcu_read_lock();
77 nfs_to->nfsd_file_put_local(localio);
78 rcu_read_unlock();
79 }
80
81 #else /* CONFIG_NFS_LOCALIO */
82 static inline void nfsd_localio_ops_init(void)
83 {
84 }
85 static inline void nfs_to_nfsd_file_put_local(
86 {
87 }
88 #endif /* CONFIG_NFS_LOCALIO */
89
90 #endif /* __LINUX_NFSLOCALIO_H */
91
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