include/uapi/linux/auto_fs.h

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2 /*
   3  *   Copyright 1997 Transmeta Corporation - All Rights Reserved
   4  *
   5  * This file is part of the Linux kernel and is made available under
   6  * the terms of the GNU General Public License, version 2, or at your
   7  * option, any later version, incorporated herein by reference.
   8  *
   9  * ----------------------------------------------------------------------- */
  10
  11
  12 #ifndef _UAPI_LINUX_AUTO_FS_H
  13 #define _UAPI_LINUX_AUTO_FS_H
  14
  15 #include <linux/types.h>
  16 #include <linux/limits.h>
  17 #ifndef __KERNEL__
  18 #include <sys/ioctl.h>
  19 #endif /* __KERNEL__ */
  20
  21
  22 /* This file describes autofs v3 */
  23 #define AUTOFS_PROTO_VERSION    3
  24
  25 /* Range of protocol versions defined */
  26 #define AUTOFS_MAX_PROTO_VERSION        AUTOFS_PROTO_VERSION
  27 #define AUTOFS_MIN_PROTO_VERSION        AUTOFS_PROTO_VERSION
  28
  29 /*
  30  * The wait_queue_token (autofs_wqt_t) is part of a structure which is passed
  31  * back to the kernel via ioctl from userspace. On architectures where 32- and
  32  * 64-bit userspace binaries can be executed it's important that the size of
  33  * autofs_wqt_t stays constant between 32- and 64-bit Linux kernels so that we
  34  * do not break the binary ABI interface by changing the structure size.
  35  */
  36 #if defined(__ia64__) || defined(__alpha__) /* pure 64bit architectures */
  37 typedef unsigned long autofs_wqt_t;
  38 #else
  39 typedef unsigned int autofs_wqt_t;
  40 #endif
  41
  42 /* Packet types */
  43 #define autofs_ptype_missing    0       /* Missing entry (mount request) */
  44 #define autofs_ptype_expire     1       /* Expire entry (umount request) */
  45
  46 struct autofs_packet_hdr {
  47         int proto_version;              /* Protocol version */
  48         int type;                       /* Type of packet */
  49 };
  50
  51 struct autofs_packet_missing {
  52         struct autofs_packet_hdr hdr;
  53         autofs_wqt_t wait_queue_token;
  54         int len;
  55         char name[NAME_MAX+1];
  56 };
  57
  58 /* v3 expire (via ioctl) */
  59 struct autofs_packet_expire {
  60         struct autofs_packet_hdr hdr;
  61         int len;
  62         char name[NAME_MAX+1];
  63 };
  64
  65 #define AUTOFS_IOCTL 0x93
  66
  67 enum {
  68         AUTOFS_IOC_READY_CMD = 0x60,
  69         AUTOFS_IOC_FAIL_CMD,
  70         AUTOFS_IOC_CATATONIC_CMD,
  71         AUTOFS_IOC_PROTOVER_CMD,
  72         AUTOFS_IOC_SETTIMEOUT_CMD,
  73         AUTOFS_IOC_EXPIRE_CMD,
  74 };
  75
  76 #define AUTOFS_IOC_READY        _IO(AUTOFS_IOCTL, AUTOFS_IOC_READY_CMD)
  77 #define AUTOFS_IOC_FAIL         _IO(AUTOFS_IOCTL, AUTOFS_IOC_FAIL_CMD)
  78 #define AUTOFS_IOC_CATATONIC    _IO(AUTOFS_IOCTL, AUTOFS_IOC_CATATONIC_CMD)
  79 #define AUTOFS_IOC_PROTOVER     _IOR(AUTOFS_IOCTL, AUTOFS_IOC_PROTOVER_CMD, int)
  80 #define AUTOFS_IOC_SETTIMEOUT32 _IOWR(AUTOFS_IOCTL, AUTOFS_IOC_SETTIMEOUT_CMD, compat_ulong_t)
  81 #define AUTOFS_IOC_SETTIMEOUT   _IOWR(AUTOFS_IOCTL, AUTOFS_IOC_SETTIMEOUT_CMD, unsigned long)
  82 #define AUTOFS_IOC_EXPIRE       _IOR(AUTOFS_IOCTL, AUTOFS_IOC_EXPIRE_CMD, struct autofs_packet_expire)
  83
  84 #endif /* _UAPI_LINUX_AUTO_FS_H */