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