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