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auto_fs.h
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ /* * Copyright 1997 Transmeta Corporation - All Rights Reserved * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org> * Copyright 2005-2006,2013,2017-2018 Ian Kent <raven@themaw.net> * * This file is part of the Linux kernel and is made available under * the terms of the GNU General Public License, version 2, or at your * option, any later version, incorporated herein by reference. * * ----------------------------------------------------------------------- */ #ifndef _LINUX_AUTO_FS_H #define _LINUX_AUTO_FS_H #include <linux/types.h> #include <linux/limits.h> #include <sys/ioctl.h> #define AUTOFS_PROTO_VERSION 5 #define AUTOFS_MIN_PROTO_VERSION 3 #define AUTOFS_MAX_PROTO_VERSION 5 #define AUTOFS_PROTO_SUBVERSION 6 /* * The wait_queue_token (autofs_wqt_t) is part of a structure which is passed * back to the kernel via ioctl from userspace. On architectures where 32- and * 64-bit userspace binaries can be executed it's important that the size of * autofs_wqt_t stays constant between 32- and 64-bit Linux kernels so that we * do not break the binary ABI interface by changing the structure size. */ #if defined(__ia64__) || defined(__alpha__) /* pure 64bit architectures */ typedef unsigned long autofs_wqt_t; #else typedef unsigned int autofs_wqt_t; #endif /* Packet types */ #define autofs_ptype_missing 0 /* Missing entry (mount request) */ #define autofs_ptype_expire 1 /* Expire entry (umount request) */ struct autofs_packet_hdr { int proto_version; /* Protocol version */ int type; /* Type of packet */ }; struct autofs_packet_missing { struct autofs_packet_hdr hdr; autofs_wqt_t wait_queue_token; int len; char name[NAME_MAX+1]; }; /* v3 expire (via ioctl) */ struct autofs_packet_expire { struct autofs_packet_hdr hdr; int len; char name[NAME_MAX+1]; }; #define AUTOFS_IOCTL 0x93 enum { AUTOFS_IOC_READY_CMD = 0x60, AUTOFS_IOC_FAIL_CMD, AUTOFS_IOC_CATATONIC_CMD, AUTOFS_IOC_PROTOVER_CMD, AUTOFS_IOC_SETTIMEOUT_CMD, AUTOFS_IOC_EXPIRE_CMD, }; #define AUTOFS_IOC_READY _IO(AUTOFS_IOCTL, AUTOFS_IOC_READY_CMD) #define AUTOFS_IOC_FAIL _IO(AUTOFS_IOCTL, AUTOFS_IOC_FAIL_CMD) #define AUTOFS_IOC_CATATONIC _IO(AUTOFS_IOCTL, AUTOFS_IOC_CATATONIC_CMD) #define AUTOFS_IOC_PROTOVER _IOR(AUTOFS_IOCTL, \ AUTOFS_IOC_PROTOVER_CMD, int) #define AUTOFS_IOC_SETTIMEOUT32 _IOWR(AUTOFS_IOCTL, \ AUTOFS_IOC_SETTIMEOUT_CMD, \ compat_ulong_t) #define AUTOFS_IOC_SETTIMEOUT _IOWR(AUTOFS_IOCTL, \ AUTOFS_IOC_SETTIMEOUT_CMD, \ unsigned long) #define AUTOFS_IOC_EXPIRE _IOR(AUTOFS_IOCTL, \ AUTOFS_IOC_EXPIRE_CMD, \ struct autofs_packet_expire) /* autofs version 4 and later definitions */ /* Mask for expire behaviour */ #define AUTOFS_EXP_NORMAL 0x00 #define AUTOFS_EXP_IMMEDIATE 0x01 #define AUTOFS_EXP_LEAVES 0x02 #define AUTOFS_EXP_FORCED 0x04 #define AUTOFS_TYPE_ANY 0U #define AUTOFS_TYPE_INDIRECT 1U #define AUTOFS_TYPE_DIRECT 2U #define AUTOFS_TYPE_OFFSET 4U static __inline__ void set_autofs_type_indirect(unsigned int *type) { *type = AUTOFS_TYPE_INDIRECT; } static __inline__ unsigned int autofs_type_indirect(unsigned int type) { return (type == AUTOFS_TYPE_INDIRECT); } static __inline__ void set_autofs_type_direct(unsigned int *type) { *type = AUTOFS_TYPE_DIRECT; } static __inline__ unsigned int autofs_type_direct(unsigned int type) { return (type == AUTOFS_TYPE_DIRECT); } static __inline__ void set_autofs_type_offset(unsigned int *type) { *type = AUTOFS_TYPE_OFFSET; } static __inline__ unsigned int autofs_type_offset(unsigned int type) { return (type == AUTOFS_TYPE_OFFSET); } static __inline__ unsigned int autofs_type_trigger(unsigned int type) { return (type == AUTOFS_TYPE_DIRECT || type == AUTOFS_TYPE_OFFSET); } /* * This isn't really a type as we use it to say "no type set" to * indicate we want to search for "any" mount in the * autofs_dev_ioctl_ismountpoint() device ioctl function. */ static __inline__ void set_autofs_type_any(unsigned int *type) { *type = AUTOFS_TYPE_ANY; } static __inline__ unsigned int autofs_type_any(unsigned int type) { return (type == AUTOFS_TYPE_ANY); } /* Daemon notification packet types */ enum autofs_notify { NFY_NONE, NFY_MOUNT, NFY_EXPIRE }; /* Kernel protocol version 4 packet types */ /* Expire entry (umount request) */ #define autofs_ptype_expire_multi 2 /* Kernel protocol version 5 packet types */ /* Indirect mount missing and expire requests. */ #define autofs_ptype_missing_indirect 3 #define autofs_ptype_expire_indirect 4 /* Direct mount missing and expire requests */ #define autofs_ptype_missing_direct 5 #define autofs_ptype_expire_direct 6 /* v4 multi expire (via pipe) */ struct autofs_packet_expire_multi { struct autofs_packet_hdr hdr; autofs_wqt_t wait_queue_token; int len; char name[NAME_MAX+1]; }; union autofs_packet_union { struct autofs_packet_hdr hdr; struct autofs_packet_missing missing; struct autofs_packet_expire expire; struct autofs_packet_expire_multi expire_multi; }; /* autofs v5 common packet struct */ struct autofs_v5_packet { struct autofs_packet_hdr hdr; autofs_wqt_t wait_queue_token; __u32 dev; __u64 ino; __u32 uid; __u32 gid; __u32 pid; __u32 tgid; __u32 len; char name[NAME_MAX+1]; }; typedef struct autofs_v5_packet autofs_packet_missing_indirect_t; typedef struct autofs_v5_packet autofs_packet_expire_indirect_t; typedef struct autofs_v5_packet autofs_packet_missing_direct_t; typedef struct autofs_v5_packet autofs_packet_expire_direct_t; union autofs_v5_packet_union { struct autofs_packet_hdr hdr; struct autofs_v5_packet v5_packet; autofs_packet_missing_indirect_t missing_indirect; autofs_packet_expire_indirect_t expire_indirect; autofs_packet_missing_direct_t missing_direct; autofs_packet_expire_direct_t expire_direct; }; enum { AUTOFS_IOC_EXPIRE_MULTI_CMD = 0x66, /* AUTOFS_IOC_EXPIRE_CMD + 1 */ AUTOFS_IOC_PROTOSUBVER_CMD, AUTOFS_IOC_ASKUMOUNT_CMD = 0x70, /* AUTOFS_DEV_IOCTL_VERSION_CMD - 1 */ }; #define AUTOFS_IOC_EXPIRE_MULTI _IOW(AUTOFS_IOCTL, \ AUTOFS_IOC_EXPIRE_MULTI_CMD, int) #define AUTOFS_IOC_PROTOSUBVER _IOR(AUTOFS_IOCTL, \ AUTOFS_IOC_PROTOSUBVER_CMD, int) #define AUTOFS_IOC_ASKUMOUNT _IOR(AUTOFS_IOCTL, \ AUTOFS_IOC_ASKUMOUNT_CMD, int) #endif /* _LINUX_AUTO_FS_H */
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