xref: /illumos-gate/usr/src/uts/common/sharefs/sharefs.h (revision 0dfe541e13279d277d838d6a27e55188b9486cb1)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*
28  * Copyright 2018 Nexenta Systems, Inc.
29  */
30 
31 #ifndef _SHAREFS_SHAREFS_H
32 #define	_SHAREFS_SHAREFS_H
33 
34 /*
35  * This header provides service for the sharefs module.
36  */
37 
38 #include <sys/modctl.h>
39 #include <sys/vfs.h>
40 #include <sys/vnode.h>
41 #include <sys/gfs.h>
42 #include <sharefs/share.h>
43 #include <sharefs/sharetab.h>
44 
45 #ifdef __cplusplus
46 extern "C" {
47 #endif
48 
49 #define	SHAREFS_ROOT	"/etc/dfs"
50 #define	SHAREFS_BASE	"sharetab"
51 
52 /*
53  * Lengths of strings.
54  */
55 typedef struct sharefs_lens {
56 	int	shl_path;
57 	int	shl_res;
58 	int	shl_fstype;
59 	int	shl_opts;
60 	int	shl_descr;
61 } sharefs_lens_t;
62 
63 /*
64  * VFS data object
65  */
66 typedef struct sharefs_vfs {
67 	vnode_t	*sharefs_vfs_root;
68 } sharefs_vfs_t;
69 
70 #define	SHAREFS_NAME_MAX	MAXNAMELEN
71 
72 typedef struct sharetab_globals {
73 	/*
74 	 * The lock ordering whenever sharefs_lock and sharetab_lock both
75 	 * need to be held is: sharefs_lock and then sharetab_lock.
76 	 */
77 	krwlock_t	sharefs_lock;	/* lock for the vnode ops */
78 	sharetab_t	*sharefs_sharetab;	/* The sharetab. */
79 
80 	uint_t		sharetab_count;	/* How many shares? */
81 	krwlock_t	sharetab_lock;	/* lock for the cached sharetab */
82 	size_t		sharetab_size;	/* How big is the sharetab file? */
83 
84 	timestruc_t	sharetab_mtime;	/* Last mod to sharetab */
85 	timestruc_t	sharetab_snap_time;	/* Last snap */
86 	uint_t		sharetab_generation;	/* Which copy is it? */
87 } sharetab_globals_t;
88 
89 #define	SHAREFS_INO_FILE	0x80
90 
91 extern vnode_t *sharefs_create_root_file(vfs_t *);
92 extern sharetab_globals_t *sharetab_get_globals(zone_t *zone);
93 
94 /*
95  * Sharetab file
96  *
97  * Note that even though the sharetab code does not explictly
98  * use 'sharefs_file', it is required by GFS that the first
99  * field of the private data be a gfs_file_t.
100  */
101 typedef struct shnode_t {
102 	gfs_file_t	sharefs_file;		/* gfs file */
103 	char		*sharefs_snap;		/* snapshot of the share */
104 	size_t		sharefs_size;		/* size of the snapshot */
105 	uint_t		sharefs_count;		/* number of shares */
106 	uint_t		sharefs_refs;		/* reference count */
107 	uint_t		sharefs_real_vp;	/* Are we a real or snap */
108 	uint_t		sharefs_generation;	/* Which copy are we? */
109 	timestruc_t	sharefs_snap_time;	/* When were we modded? */
110 } shnode_t;
111 
112 /*
113  * Some conversion macros:
114  */
115 #define	VTOSH(vp)	((shnode_t *)((vp)->v_data))
116 
117 extern const fs_operation_def_t	sharefs_tops_data[];
118 extern vnodeops_t		*sharefs_ops_data;
119 
120 extern void sharefs_data_init(void);
121 
122 extern void sharefs_sharetab_init(void);
123 
124 #ifdef __cplusplus
125 }
126 #endif
127 
128 #endif /* !_SHAREFS_SHAREFS_H */
129