1 /* -*- c -*-
2 * linux/include/linux/auto_fs4.h
3 *
4 * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
5 *
6 * This file is part of the Linux kernel and is made available under
7 * the terms of the GNU General Public License, version 2, or at your
8 * option, any later version, incorporated herein by reference.
9 */
10
11 #ifndef _LINUX_AUTO_FS4_H
12 #define _LINUX_AUTO_FS4_H
13
14 /* Include common v3 definitions */
15 #include <linux/types.h>
16 #include <linux/auto_fs.h>
17
18 /* autofs v4 definitions */
19 #undef AUTOFS_PROTO_VERSION
20 #undef AUTOFS_MIN_PROTO_VERSION
21 #undef AUTOFS_MAX_PROTO_VERSION
22
23 #define AUTOFS_PROTO_VERSION 5
24 #define AUTOFS_MIN_PROTO_VERSION 3
25 #define AUTOFS_MAX_PROTO_VERSION 5
26
27 #define AUTOFS_PROTO_SUBVERSION 1
28
29 /* Mask for expire behaviour */
30 #define AUTOFS_EXP_IMMEDIATE 1
31 #define AUTOFS_EXP_LEAVES 2
32
33 #define AUTOFS_TYPE_ANY 0U
34 #define AUTOFS_TYPE_INDIRECT 1U
35 #define AUTOFS_TYPE_DIRECT 2U
36 #define AUTOFS_TYPE_OFFSET 4U
37
38 static inline void set_autofs_type_indirect(unsigned int *type)
39 {
40 *type = AUTOFS_TYPE_INDIRECT;
41 return;
42 }
43
44 static inline unsigned int autofs_type_indirect(unsigned int type)
45 {
46 return (type == AUTOFS_TYPE_INDIRECT);
47 }
48
49 static inline void set_autofs_type_direct(unsigned int *type)
50 {
51 *type = AUTOFS_TYPE_DIRECT;
52 return;
53 }
54
55 static inline unsigned int autofs_type_direct(unsigned int type)
56 {
57 return (type == AUTOFS_TYPE_DIRECT);
58 }
59
60 static inline void set_autofs_type_offset(unsigned int *type)
61 {
62 *type = AUTOFS_TYPE_OFFSET;
63 return;
64 }
65
66 static inline unsigned int autofs_type_offset(unsigned int type)
67 {
68 return (type == AUTOFS_TYPE_OFFSET);
69 }
70
71 static inline unsigned int autofs_type_trigger(unsigned int type)
72 {
73 return (type == AUTOFS_TYPE_DIRECT || type == AUTOFS_TYPE_OFFSET);
74 }
75
76 /*
77 * This isn't really a type as we use it to say "no type set" to
78 * indicate we want to search for "any" mount in the
79 * autofs_dev_ioctl_ismountpoint() device ioctl function.
80 */
81 static inline void set_autofs_type_any(unsigned int *type)
82 {
83 *type = AUTOFS_TYPE_ANY;
84 return;
85 }
86
87 static inline unsigned int autofs_type_any(unsigned int type)
88 {
89 return (type == AUTOFS_TYPE_ANY);
90 }
91
92 /* Daemon notification packet types */
93 enum autofs_notify {
94 NFY_NONE,
95 NFY_MOUNT,
96 NFY_EXPIRE
97 };
98
99 /* Kernel protocol version 4 packet types */
100
101 /* Expire entry (umount request) */
102 #define autofs_ptype_expire_multi 2
103
104 /* Kernel protocol version 5 packet types */
105
106 /* Indirect mount missing and expire requests. */
107 #define autofs_ptype_missing_indirect 3
108 #define autofs_ptype_expire_indirect 4
109
110 /* Direct mount missing and expire requests */
111 #define autofs_ptype_missing_direct 5
112 #define autofs_ptype_expire_direct 6
113
114 /* v4 multi expire (via pipe) */
115 struct autofs_packet_expire_multi {
116 struct autofs_packet_hdr hdr;
117 autofs_wqt_t wait_queue_token;
118 int len;
119 char name[NAME_MAX+1];
120 };
121
122 union autofs_packet_union {
123 struct autofs_packet_hdr hdr;
124 struct autofs_packet_missing missing;
125 struct autofs_packet_expire expire;
126 struct autofs_packet_expire_multi expire_multi;
127 };
128
129 /* autofs v5 common packet struct */
130 struct autofs_v5_packet {
131 struct autofs_packet_hdr hdr;
132 autofs_wqt_t wait_queue_token;
133 __u32 dev;
134 __u64 ino;
135 __u32 uid;
136 __u32 gid;
137 __u32 pid;
138 __u32 tgid;
139 __u32 len;
140 char name[NAME_MAX+1];
141 };
142
143 typedef struct autofs_v5_packet autofs_packet_missing_indirect_t;
144 typedef struct autofs_v5_packet autofs_packet_expire_indirect_t;
145 typedef struct autofs_v5_packet autofs_packet_missing_direct_t;
146 typedef struct autofs_v5_packet autofs_packet_expire_direct_t;
147
148 union autofs_v5_packet_union {
149 struct autofs_packet_hdr hdr;
150 struct autofs_v5_packet v5_packet;
151 autofs_packet_missing_indirect_t missing_indirect;
152 autofs_packet_expire_indirect_t expire_indirect;
153 autofs_packet_missing_direct_t missing_direct;
154 autofs_packet_expire_direct_t expire_direct;
155 };
156
157 #define AUTOFS_IOC_EXPIRE_MULTI _IOW(0x93,0x66,int)
158 #define AUTOFS_IOC_EXPIRE_INDIRECT AUTOFS_IOC_EXPIRE_MULTI
159 #define AUTOFS_IOC_EXPIRE_DIRECT AUTOFS_IOC_EXPIRE_MULTI
160 #define AUTOFS_IOC_PROTOSUBVER _IOR(0x93,0x67,int)
161 #define AUTOFS_IOC_ASKUMOUNT _IOR(0x93,0x70,int)
162
163
164 #endif /* _LINUX_AUTO_FS4_H */
165
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