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 | #include <linux/sunrpc/svc.h> |
12 | |
13 | extern struct nfs_ssc_client_ops_tbl nfs_ssc_client_tbl; |
14 | |
15 | /* |
16 | * NFS_V4 |
17 | */ |
18 | struct nfs4_ssc_client_ops { |
19 | struct file *(*sco_open)(struct vfsmount *ss_mnt, |
20 | struct nfs_fh *src_fh, nfs4_stateid *stateid); |
21 | void (*sco_close)(struct file *filep); |
22 | }; |
23 | |
24 | /* |
25 | * NFS_FS |
26 | */ |
27 | struct nfs_ssc_client_ops { |
28 | void (*sco_sb_deactive)(struct super_block *sb); |
29 | }; |
30 | |
31 | struct nfs_ssc_client_ops_tbl { |
32 | const struct nfs4_ssc_client_ops *ssc_nfs4_ops; |
33 | const struct nfs_ssc_client_ops *ssc_nfs_ops; |
34 | }; |
35 | |
36 | extern void nfs42_ssc_register_ops(void); |
37 | extern void nfs42_ssc_unregister_ops(void); |
38 | |
39 | extern void nfs42_ssc_register(const struct nfs4_ssc_client_ops *ops); |
40 | extern void nfs42_ssc_unregister(const struct nfs4_ssc_client_ops *ops); |
41 | |
42 | #ifdef CONFIG_NFSD_V4_2_INTER_SSC |
43 | static inline struct file *nfs42_ssc_open(struct vfsmount *ss_mnt, |
44 | struct nfs_fh *src_fh, nfs4_stateid *stateid) |
45 | { |
46 | if (nfs_ssc_client_tbl.ssc_nfs4_ops) |
47 | return (*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_open)(ss_mnt, src_fh, stateid); |
48 | return ERR_PTR(error: -EIO); |
49 | } |
50 | |
51 | static inline void nfs42_ssc_close(struct file *filep) |
52 | { |
53 | if (nfs_ssc_client_tbl.ssc_nfs4_ops) |
54 | (*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_close)(filep); |
55 | } |
56 | #endif |
57 | |
58 | struct nfsd4_ssc_umount_item { |
59 | struct list_head nsui_list; |
60 | bool nsui_busy; |
61 | /* |
62 | * nsui_refcnt inited to 2, 1 on list and 1 for consumer. Entry |
63 | * is removed when refcnt drops to 1 and nsui_expire expires. |
64 | */ |
65 | refcount_t nsui_refcnt; |
66 | unsigned long nsui_expire; |
67 | struct vfsmount *nsui_vfsmount; |
68 | char nsui_ipaddr[RPC_MAX_ADDRBUFLEN + 1]; |
69 | }; |
70 | |
71 | /* |
72 | * NFS_FS |
73 | */ |
74 | extern void nfs_ssc_register(const struct nfs_ssc_client_ops *ops); |
75 | extern void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops); |
76 | |
77 | static inline void nfs_do_sb_deactive(struct super_block *sb) |
78 | { |
79 | if (nfs_ssc_client_tbl.ssc_nfs_ops) |
80 | (*nfs_ssc_client_tbl.ssc_nfs_ops->sco_sb_deactive)(sb); |
81 | } |
82 |