include/linux/auto_fs.h

   1 /* -*- linux-c -*- ------------------------------------------------------- *
   2  *
   3  * linux/include/linux/auto_fs.h
   4  *
   5  *   Copyright 1997 Transmeta Corporation - All Rights Reserved
   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
  14 #ifndef _LINUX_AUTO_FS_H
  15 #define _LINUX_AUTO_FS_H
  16
  17 #ifdef __KERNEL__
  18 #include <linux/fs.h>
  19 #include <linux/limits.h>
  20 #include <asm/types.h>
  21 #endif /* __KERNEL__ */
  22
  23 #include <linux/ioctl.h>
  24
  25 /* This file describes autofs v3 */
  26 #define AUTOFS_PROTO_VERSION    3
  27
  28 /* Range of protocol versions defined */
  29 #define AUTOFS_MAX_PROTO_VERSION        AUTOFS_PROTO_VERSION
  30 #define AUTOFS_MIN_PROTO_VERSION        AUTOFS_PROTO_VERSION
  31
  32 /*
  33  * Architectures where both 32- and 64-bit binaries can be executed
  34  * on 64-bit kernels need this.  This keeps the structure format
  35  * uniform, and makes sure the wait_queue_token isn't too big to be
  36  * passed back down to the kernel.
  37  *
  38  * This assumes that on these architectures:
  39  * mode     32 bit    64 bit
  40  * -------------------------
  41  * int      32 bit    32 bit
  42  * long     32 bit    64 bit
  43  *
  44  * If so, 32-bit user-space code should be backwards compatible.
  45  */
  46
  47 #if defined(__sparc__) || defined(__mips__) || defined(__x86_64__) \
  48  || defined(__powerpc__) || defined(__s390__)
  49 typedef unsigned int autofs_wqt_t;
  50 #else
  51 typedef unsigned long autofs_wqt_t;
  52 #endif
  53
  54 /* Packet types */
  55 #define autofs_ptype_missing    0       /* Missing entry (mount request) */
  56 #define autofs_ptype_expire     1       /* Expire entry (umount request) */
  57
  58 struct autofs_packet_hdr {
  59         int proto_version;              /* Protocol version */
  60         int type;                       /* Type of packet */
  61 };
  62
  63 struct autofs_packet_missing {
  64         struct autofs_packet_hdr hdr;
  65         autofs_wqt_t wait_queue_token;
  66         int len;
  67         char name[NAME_MAX+1];
  68 };
  69
  70 /* v3 expire (via ioctl) */
  71 struct autofs_packet_expire {
  72         struct autofs_packet_hdr hdr;
  73         int len;
  74         char name[NAME_MAX+1];
  75 };
  76
  77 #define AUTOFS_IOC_READY      _IO(0x93,0x60)
  78 #define AUTOFS_IOC_FAIL       _IO(0x93,0x61)
  79 #define AUTOFS_IOC_CATATONIC  _IO(0x93,0x62)
  80 #define AUTOFS_IOC_PROTOVER   _IOR(0x93,0x63,int)
  81 #define AUTOFS_IOC_SETTIMEOUT _IOWR(0x93,0x64,unsigned long)
  82 #define AUTOFS_IOC_EXPIRE     _IOR(0x93,0x65,struct autofs_packet_expire)
  83
  84 #endif /* _LINUX_AUTO_FS_H */