root/include/uapi/linux/auto_fs.h

INCLUDED FROM

DEFINITIONS

1. set_autofs_type_indirect
2. autofs_type_indirect
3. set_autofs_type_direct
4. autofs_type_direct
5. set_autofs_type_offset
6. autofs_type_offset
7. autofs_type_trigger
8. set_autofs_type_any
9. autofs_type_any

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2 /*
   3  * Copyright 1997 Transmeta Corporation - All Rights Reserved
   4  * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
   5  * Copyright 2005-2006,2013,2017-2018 Ian Kent <raven@themaw.net>
   6  *
   7  * This file is part of the Linux kernel and is made available under
   8  * the terms of the GNU General Public License, version 2, or at your
   9  * option, any later version, incorporated herein by reference.
  10  *
  11  * ----------------------------------------------------------------------- */
  12 
  13 #ifndef _UAPI_LINUX_AUTO_FS_H
  14 #define _UAPI_LINUX_AUTO_FS_H
  15 
  16 #include <linux/types.h>
  17 #include <linux/limits.h>
  18 #ifndef __KERNEL__
  19 #include <sys/ioctl.h>
  20 #endif /* __KERNEL__ */
  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         5
  27 
  28 /*
  29  * The wait_queue_token (autofs_wqt_t) is part of a structure which is passed
  30  * back to the kernel via ioctl from userspace. On architectures where 32- and
  31  * 64-bit userspace binaries can be executed it's important that the size of
  32  * autofs_wqt_t stays constant between 32- and 64-bit Linux kernels so that we
  33  * do not break the binary ABI interface by changing the structure size.
  34  */
  35 #if defined(__ia64__) || defined(__alpha__) /* pure 64bit architectures */
  36 typedef unsigned long autofs_wqt_t;
  37 #else
  38 typedef unsigned int autofs_wqt_t;
  39 #endif
  40 
  41 /* Packet types */
  42 #define autofs_ptype_missing    0       /* Missing entry (mount request) */
  43 #define autofs_ptype_expire     1       /* Expire entry (umount request) */
  44 
  45 struct autofs_packet_hdr {
  46         int proto_version;              /* Protocol version */
  47         int type;                       /* Type of packet */
  48 };
  49 
  50 struct autofs_packet_missing {
  51         struct autofs_packet_hdr hdr;
  52         autofs_wqt_t wait_queue_token;
  53         int len;
  54         char name[NAME_MAX+1];
  55 };      
  56 
  57 /* v3 expire (via ioctl) */
  58 struct autofs_packet_expire {
  59         struct autofs_packet_hdr hdr;
  60         int len;
  61         char name[NAME_MAX+1];
  62 };
  63 
  64 #define AUTOFS_IOCTL 0x93
  65 
  66 enum {
  67         AUTOFS_IOC_READY_CMD = 0x60,
  68         AUTOFS_IOC_FAIL_CMD,
  69         AUTOFS_IOC_CATATONIC_CMD,
  70         AUTOFS_IOC_PROTOVER_CMD,
  71         AUTOFS_IOC_SETTIMEOUT_CMD,
  72         AUTOFS_IOC_EXPIRE_CMD,
  73 };
  74 
  75 #define AUTOFS_IOC_READY        _IO(AUTOFS_IOCTL, AUTOFS_IOC_READY_CMD)
  76 #define AUTOFS_IOC_FAIL         _IO(AUTOFS_IOCTL, AUTOFS_IOC_FAIL_CMD)
  77 #define AUTOFS_IOC_CATATONIC    _IO(AUTOFS_IOCTL, AUTOFS_IOC_CATATONIC_CMD)
  78 #define AUTOFS_IOC_PROTOVER     _IOR(AUTOFS_IOCTL, \
  79                                      AUTOFS_IOC_PROTOVER_CMD, int)
  80 #define AUTOFS_IOC_SETTIMEOUT32 _IOWR(AUTOFS_IOCTL, \
  81                                       AUTOFS_IOC_SETTIMEOUT_CMD, \
  82                                       compat_ulong_t)
  83 #define AUTOFS_IOC_SETTIMEOUT   _IOWR(AUTOFS_IOCTL, \
  84                                       AUTOFS_IOC_SETTIMEOUT_CMD, \
  85                                       unsigned long)
  86 #define AUTOFS_IOC_EXPIRE       _IOR(AUTOFS_IOCTL, \
  87                                      AUTOFS_IOC_EXPIRE_CMD, \
  88                                      struct autofs_packet_expire)
  89 
  90 /* autofs version 4 and later definitions */
  91 
  92 /* Mask for expire behaviour */
  93 #define AUTOFS_EXP_NORMAL               0x00
  94 #define AUTOFS_EXP_IMMEDIATE            0x01
  95 #define AUTOFS_EXP_LEAVES               0x02
  96 #define AUTOFS_EXP_FORCED               0x04
  97 
  98 #define AUTOFS_TYPE_ANY                 0U
  99 #define AUTOFS_TYPE_INDIRECT            1U
 100 #define AUTOFS_TYPE_DIRECT              2U
 101 #define AUTOFS_TYPE_OFFSET              4U
 102 
 103 static inline void set_autofs_type_indirect(unsigned int *type)
 104 {
 105         *type = AUTOFS_TYPE_INDIRECT;
 106 }
 107 
 108 static inline unsigned int autofs_type_indirect(unsigned int type)
 109 {
 110         return (type == AUTOFS_TYPE_INDIRECT);
 111 }
 112 
 113 static inline void set_autofs_type_direct(unsigned int *type)
 114 {
 115         *type = AUTOFS_TYPE_DIRECT;
 116 }
 117 
 118 static inline unsigned int autofs_type_direct(unsigned int type)
 119 {
 120         return (type == AUTOFS_TYPE_DIRECT);
 121 }
 122 
 123 static inline void set_autofs_type_offset(unsigned int *type)
 124 {
 125         *type = AUTOFS_TYPE_OFFSET;
 126 }
 127 
 128 static inline unsigned int autofs_type_offset(unsigned int type)
 129 {
 130         return (type == AUTOFS_TYPE_OFFSET);
 131 }
 132 
 133 static inline unsigned int autofs_type_trigger(unsigned int type)
 134 {
 135         return (type == AUTOFS_TYPE_DIRECT || type == AUTOFS_TYPE_OFFSET);
 136 }
 137 
 138 /*
 139  * This isn't really a type as we use it to say "no type set" to
 140  * indicate we want to search for "any" mount in the
 141  * autofs_dev_ioctl_ismountpoint() device ioctl function.
 142  */
 143 static inline void set_autofs_type_any(unsigned int *type)
 144 {
 145         *type = AUTOFS_TYPE_ANY;
 146 }
 147 
 148 static inline unsigned int autofs_type_any(unsigned int type)
 149 {
 150         return (type == AUTOFS_TYPE_ANY);
 151 }
 152 
 153 /* Daemon notification packet types */
 154 enum autofs_notify {
 155         NFY_NONE,
 156         NFY_MOUNT,
 157         NFY_EXPIRE
 158 };
 159 
 160 /* Kernel protocol version 4 packet types */
 161 
 162 /* Expire entry (umount request) */
 163 #define autofs_ptype_expire_multi       2
 164 
 165 /* Kernel protocol version 5 packet types */
 166 
 167 /* Indirect mount missing and expire requests. */
 168 #define autofs_ptype_missing_indirect   3
 169 #define autofs_ptype_expire_indirect    4
 170 
 171 /* Direct mount missing and expire requests */
 172 #define autofs_ptype_missing_direct     5
 173 #define autofs_ptype_expire_direct      6
 174 
 175 /* v4 multi expire (via pipe) */
 176 struct autofs_packet_expire_multi {
 177         struct autofs_packet_hdr hdr;
 178         autofs_wqt_t wait_queue_token;
 179         int len;
 180         char name[NAME_MAX+1];
 181 };
 182 
 183 union autofs_packet_union {
 184         struct autofs_packet_hdr hdr;
 185         struct autofs_packet_missing missing;
 186         struct autofs_packet_expire expire;
 187         struct autofs_packet_expire_multi expire_multi;
 188 };
 189 
 190 /* autofs v5 common packet struct */
 191 struct autofs_v5_packet {
 192         struct autofs_packet_hdr hdr;
 193         autofs_wqt_t wait_queue_token;
 194         __u32 dev;
 195         __u64 ino;
 196         __u32 uid;
 197         __u32 gid;
 198         __u32 pid;
 199         __u32 tgid;
 200         __u32 len;
 201         char name[NAME_MAX+1];
 202 };
 203 
 204 typedef struct autofs_v5_packet autofs_packet_missing_indirect_t;
 205 typedef struct autofs_v5_packet autofs_packet_expire_indirect_t;
 206 typedef struct autofs_v5_packet autofs_packet_missing_direct_t;
 207 typedef struct autofs_v5_packet autofs_packet_expire_direct_t;
 208 
 209 union autofs_v5_packet_union {
 210         struct autofs_packet_hdr hdr;
 211         struct autofs_v5_packet v5_packet;
 212         autofs_packet_missing_indirect_t missing_indirect;
 213         autofs_packet_expire_indirect_t expire_indirect;
 214         autofs_packet_missing_direct_t missing_direct;
 215         autofs_packet_expire_direct_t expire_direct;
 216 };
 217 
 218 enum {
 219         AUTOFS_IOC_EXPIRE_MULTI_CMD = 0x66, /* AUTOFS_IOC_EXPIRE_CMD + 1 */
 220         AUTOFS_IOC_PROTOSUBVER_CMD,
 221         AUTOFS_IOC_ASKUMOUNT_CMD = 0x70, /* AUTOFS_DEV_IOCTL_VERSION_CMD - 1 */
 222 };
 223 
 224 #define AUTOFS_IOC_EXPIRE_MULTI         _IOW(AUTOFS_IOCTL, \
 225                                              AUTOFS_IOC_EXPIRE_MULTI_CMD, int)
 226 #define AUTOFS_IOC_PROTOSUBVER          _IOR(AUTOFS_IOCTL, \
 227                                              AUTOFS_IOC_PROTOSUBVER_CMD, int)
 228 #define AUTOFS_IOC_ASKUMOUNT            _IOR(AUTOFS_IOCTL, \
 229                                              AUTOFS_IOC_ASKUMOUNT_CMD, int)
 230 
 231 #endif /* _UAPI_LINUX_AUTO_FS_H */