1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ 2 /* 3 * Copyright 1999-2000 Jeremy Fitzhardinge <[email protected]> 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 #ifndef _LINUX_AUTO_FS4_H 11 #define _LINUX_AUTO_FS4_H 12 13 /* Include common v3 definitions */ 14 #include <linux/types.h> 15 #include <linux/auto_fs.h> 16 17 /* autofs v4 definitions */ 18 #undef AUTOFS_PROTO_VERSION 19 #undef AUTOFS_MIN_PROTO_VERSION 20 #undef AUTOFS_MAX_PROTO_VERSION 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 2 27 28 /* Mask for expire behaviour */ 29 #define AUTOFS_EXP_IMMEDIATE 1 30 #define AUTOFS_EXP_LEAVES 2 31 32 #define AUTOFS_TYPE_ANY 0U 33 #define AUTOFS_TYPE_INDIRECT 1U 34 #define AUTOFS_TYPE_DIRECT 2U 35 #define AUTOFS_TYPE_OFFSET 4U 36 37 static inline void set_autofs_type_indirect(unsigned int *type) 38 { 39 *type = AUTOFS_TYPE_INDIRECT; 40 } 41 42 static inline unsigned int autofs_type_indirect(unsigned int type) 43 { 44 return (type == AUTOFS_TYPE_INDIRECT); 45 } 46 47 static inline void set_autofs_type_direct(unsigned int *type) 48 { 49 *type = AUTOFS_TYPE_DIRECT; 50 } 51 52 static inline unsigned int autofs_type_direct(unsigned int type) 53 { 54 return (type == AUTOFS_TYPE_DIRECT); 55 } 56 57 static inline void set_autofs_type_offset(unsigned int *type) 58 { 59 *type = AUTOFS_TYPE_OFFSET; 60 } 61 62 static inline unsigned int autofs_type_offset(unsigned int type) 63 { 64 return (type == AUTOFS_TYPE_OFFSET); 65 } 66 67 static inline unsigned int autofs_type_trigger(unsigned int type) 68 { 69 return (type == AUTOFS_TYPE_DIRECT || type == AUTOFS_TYPE_OFFSET); 70 } 71 72 /* 73 * This isn't really a type as we use it to say "no type set" to 74 * indicate we want to search for "any" mount in the 75 * autofs_dev_ioctl_ismountpoint() device ioctl function. 76 */ 77 static inline void set_autofs_type_any(unsigned int *type) 78 { 79 *type = AUTOFS_TYPE_ANY; 80 } 81 82 static inline unsigned int autofs_type_any(unsigned int type) 83 { 84 return (type == AUTOFS_TYPE_ANY); 85 } 86 87 /* Daemon notification packet types */ 88 enum autofs_notify { 89 NFY_NONE, 90 NFY_MOUNT, 91 NFY_EXPIRE 92 }; 93 94 /* Kernel protocol version 4 packet types */ 95 96 /* Expire entry (umount request) */ 97 #define autofs_ptype_expire_multi 2 98 99 /* Kernel protocol version 5 packet types */ 100 101 /* Indirect mount missing and expire requests. */ 102 #define autofs_ptype_missing_indirect 3 103 #define autofs_ptype_expire_indirect 4 104 105 /* Direct mount missing and expire requests */ 106 #define autofs_ptype_missing_direct 5 107 #define autofs_ptype_expire_direct 6 108 109 /* v4 multi expire (via pipe) */ 110 struct autofs_packet_expire_multi { 111 struct autofs_packet_hdr hdr; 112 autofs_wqt_t wait_queue_token; 113 int len; 114 char name[NAME_MAX+1]; 115 }; 116 117 union autofs_packet_union { 118 struct autofs_packet_hdr hdr; 119 struct autofs_packet_missing missing; 120 struct autofs_packet_expire expire; 121 struct autofs_packet_expire_multi expire_multi; 122 }; 123 124 /* autofs v5 common packet struct */ 125 struct autofs_v5_packet { 126 struct autofs_packet_hdr hdr; 127 autofs_wqt_t wait_queue_token; 128 __u32 dev; 129 __u64 ino; 130 __u32 uid; 131 __u32 gid; 132 __u32 pid; 133 __u32 tgid; 134 __u32 len; 135 char name[NAME_MAX+1]; 136 }; 137 138 typedef struct autofs_v5_packet autofs_packet_missing_indirect_t; 139 typedef struct autofs_v5_packet autofs_packet_expire_indirect_t; 140 typedef struct autofs_v5_packet autofs_packet_missing_direct_t; 141 typedef struct autofs_v5_packet autofs_packet_expire_direct_t; 142 143 union autofs_v5_packet_union { 144 struct autofs_packet_hdr hdr; 145 struct autofs_v5_packet v5_packet; 146 autofs_packet_missing_indirect_t missing_indirect; 147 autofs_packet_expire_indirect_t expire_indirect; 148 autofs_packet_missing_direct_t missing_direct; 149 autofs_packet_expire_direct_t expire_direct; 150 }; 151 152 enum { 153 AUTOFS_IOC_EXPIRE_MULTI_CMD = 0x66, /* AUTOFS_IOC_EXPIRE_CMD + 1 */ 154 AUTOFS_IOC_PROTOSUBVER_CMD, 155 AUTOFS_IOC_ASKUMOUNT_CMD = 0x70, /* AUTOFS_DEV_IOCTL_VERSION_CMD - 1 */ 156 }; 157 158 #define AUTOFS_IOC_EXPIRE_MULTI _IOW(AUTOFS_IOCTL, AUTOFS_IOC_EXPIRE_MULTI_CMD, int) 159 #define AUTOFS_IOC_PROTOSUBVER _IOR(AUTOFS_IOCTL, AUTOFS_IOC_PROTOSUBVER_CMD, int) 160 #define AUTOFS_IOC_ASKUMOUNT _IOR(AUTOFS_IOCTL, AUTOFS_IOC_ASKUMOUNT_CMD, int) 161 162 #endif /* _LINUX_AUTO_FS4_H */ 163