include/uapi/linux/auto_fs4.h

   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         2
  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 */