1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * include/linux/nfs_ssc.h
4  *
5  * Author: Dai Ngo <dai.ngo@oracle.com>
6  *
7  * Copyright (c) 2020, Oracle and/or its affiliates.
8  */
9 
10 #include <linux/nfs_fs.h>
11 
12 extern struct nfs_ssc_client_ops_tbl nfs_ssc_client_tbl;
13 
14 /*
15  * NFS_V4
16  */
17 struct nfs4_ssc_client_ops {
18 	struct file *(*sco_open)(struct vfsmount *ss_mnt,
19 		struct nfs_fh *src_fh, nfs4_stateid *stateid);
20 	void (*sco_close)(struct file *filep);
21 };
22 
23 /*
24  * NFS_FS
25  */
26 struct nfs_ssc_client_ops {
27 	void (*sco_sb_deactive)(struct super_block *sb);
28 };
29 
30 struct nfs_ssc_client_ops_tbl {
31 	const struct nfs4_ssc_client_ops *ssc_nfs4_ops;
32 	const struct nfs_ssc_client_ops *ssc_nfs_ops;
33 };
34 
35 extern void nfs42_ssc_register_ops(void);
36 extern void nfs42_ssc_unregister_ops(void);
37 
38 extern void nfs42_ssc_register(const struct nfs4_ssc_client_ops *ops);
39 extern void nfs42_ssc_unregister(const struct nfs4_ssc_client_ops *ops);
40 
41 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
nfs42_ssc_open(struct vfsmount * ss_mnt,struct nfs_fh * src_fh,nfs4_stateid * stateid)42 static inline struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
43 		struct nfs_fh *src_fh, nfs4_stateid *stateid)
44 {
45 	if (nfs_ssc_client_tbl.ssc_nfs4_ops)
46 		return (*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_open)(ss_mnt, src_fh, stateid);
47 	return ERR_PTR(-EIO);
48 }
49 
nfs42_ssc_close(struct file * filep)50 static inline void nfs42_ssc_close(struct file *filep)
51 {
52 	if (nfs_ssc_client_tbl.ssc_nfs4_ops)
53 		(*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_close)(filep);
54 }
55 #endif
56 
57 /*
58  * NFS_FS
59  */
60 extern void nfs_ssc_register(const struct nfs_ssc_client_ops *ops);
61 extern void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops);
62 
nfs_do_sb_deactive(struct super_block * sb)63 static inline void nfs_do_sb_deactive(struct super_block *sb)
64 {
65 	if (nfs_ssc_client_tbl.ssc_nfs_ops)
66 		(*nfs_ssc_client_tbl.ssc_nfs_ops->sco_sb_deactive)(sb);
67 }
68