include/uapi/linux/auto_fs4.h

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