FreeBSD/Linux Kernel Cross Reference
sys/sys/fstypes.h
1 /* $NetBSD: fstypes.h,v 1.16 2006/10/31 08:12:46 mjf Exp $ */
2
3 /*
4 * Copyright (c) 1989, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)mount.h 8.21 (Berkeley) 5/20/95
32 */
33
34 #ifndef _SYS_FSTYPES_H_
35 #define _SYS_FSTYPES_H_
36
37 typedef struct { int32_t __fsid_val[2]; } fsid_t; /* file system id type */
38
39 #if defined(_KERNEL)
40 /*
41 * File identifier.
42 * These are unique per filesystem on a single machine.
43 */
44 struct fid {
45 unsigned short fid_len; /* length of data in bytes */
46 unsigned short fid_reserved; /* force longword alignment */
47 char fid_data[]; /* data (variable length) */
48 };
49
50 /*
51 * Generic file handle
52 */
53 struct fhandle {
54 fsid_t fh_fsid; /* File system id of mount point */
55 struct fid fh_fid; /* File sys specific id */
56 };
57 typedef struct fhandle fhandle_t;
58
59 /*
60 * FHANDLE_SIZE_MAX: arbitrary value to prevent unreasonable allocation.
61 *
62 * FHANDLE_SIZE_MIN: chosen for compatibility. smaller handles are zero-padded.
63 */
64
65 #define FHANDLE_SIZE_COMPAT 28
66 #define FHANDLE_SIZE_MAX 1024
67 #define FHANDLE_SIZE_MIN FHANDLE_SIZE_COMPAT
68
69 #define FHANDLE_FSID(fh) (&(fh)->fh_fsid)
70 #define FHANDLE_FILEID(fh) (&(fh)->fh_fid)
71 #define FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize) \
72 MAX(FHANDLE_SIZE_MIN, (offsetof(fhandle_t, fh_fid) + (fidsize)))
73 #define FHANDLE_SIZE(fh) \
74 FHANDLE_SIZE_FROM_FILEID_SIZE(FHANDLE_FILEID(fh)->fid_len)
75 #endif /* defined(_KERNEL) */
76
77 /*
78 * Mount flags. XXX BEWARE: these are not in numerical order!
79 *
80 * Unmount uses MNT_FORCE flag.
81 *
82 * Note that all mount flags are listed here. if you need to add one, take
83 * one of the __MNT_UNUSED flags.
84 */
85
86 #define __MNT_UNUSED1 0x00020000
87 #define __MNT_UNUSED2 0x00200000
88 #define __MNT_UNUSED3 0x00800000
89 #define __MNT_UNUSED4 0x01000000
90 #define __MNT_UNUSED5 0x02000000
91
92 #define MNT_RDONLY 0x00000001 /* read only filesystem */
93 #define MNT_SYNCHRONOUS 0x00000002 /* file system written synchronously */
94 #define MNT_NOEXEC 0x00000004 /* can't exec from filesystem */
95 #define MNT_NOSUID 0x00000008 /* don't honor setuid bits on fs */
96 #define MNT_NODEV 0x00000010 /* don't interpret special files */
97 #define MNT_UNION 0x00000020 /* union with underlying filesystem */
98 #define MNT_ASYNC 0x00000040 /* file system written asynchronously */
99 #define MNT_NOCOREDUMP 0x00008000 /* don't write core dumps to this FS */
100 #define MNT_IGNORE 0x00100000 /* don't show entry in df */
101 #define MNT_NOATIME 0x04000000 /* Never update access times in fs */
102 #define MNT_SYMPERM 0x20000000 /* recognize symlink permission */
103 #define MNT_NODEVMTIME 0x40000000 /* Never update mod times for devs */
104 #define MNT_SOFTDEP 0x80000000 /* Use soft dependencies */
105
106 #define __MNT_BASIC_FLAGS \
107 { MNT_RDONLY, 0, "read-only" }, \
108 { MNT_SYNCHRONOUS, 0, "synchronous" }, \
109 { MNT_NOEXEC, 0, "noexec" }, \
110 { MNT_NOSUID, 0, "nosuid" }, \
111 { MNT_NODEV, 0, "nodev" }, \
112 { MNT_UNION, 0, "union" }, \
113 { MNT_ASYNC, 0, "asynchronous" }, \
114 { MNT_NOCOREDUMP, 0, "nocoredump" }, \
115 { MNT_IGNORE, 0, "hidden" }, \
116 { MNT_NOATIME, 0, "noatime" }, \
117 { MNT_SYMPERM, 0, "symperm" }, \
118 { MNT_NODEVMTIME, 0, "nodevmtime" }, \
119 { MNT_SOFTDEP, 0, "soft dependencies" },
120
121 /*
122 * exported mount flags.
123 */
124 #define MNT_EXRDONLY 0x00000080 /* exported read only */
125 #define MNT_EXPORTED 0x00000100 /* file system is exported */
126 #define MNT_DEFEXPORTED 0x00000200 /* exported to the world */
127 #define MNT_EXPORTANON 0x00000400 /* use anon uid mapping for everyone */
128 #define MNT_EXKERB 0x00000800 /* exported with Kerberos uid mapping */
129 #define MNT_EXNORESPORT 0x08000000 /* don't enforce reserved ports (NFS) */
130 #define MNT_EXPUBLIC 0x10000000 /* public export (WebNFS) */
131
132 #define __MNT_EXPORTED_FLAGS \
133 { MNT_EXRDONLY, 1, "exported read-only" }, \
134 { MNT_EXPORTED, 0, "NFS exported" }, \
135 { MNT_DEFEXPORTED, 1, "exported to the world" }, \
136 { MNT_EXPORTANON, 1, "anon uid mapping" }, \
137 { MNT_EXKERB, 1, "kerberos uid mapping" }, \
138 { MNT_EXNORESPORT, 0, "non-reserved ports" }, \
139 { MNT_EXPUBLIC, 0, "WebNFS exports" },
140
141 /*
142 * Flags set by internal operations.
143 */
144 #define MNT_LOCAL 0x00001000 /* filesystem is stored locally */
145 #define MNT_QUOTA 0x00002000 /* quotas are enabled on filesystem */
146 #define MNT_ROOTFS 0x00004000 /* identifies the root filesystem */
147
148 #define __MNT_INTERNAL_FLAGS \
149 { MNT_LOCAL, 0, "local" }, \
150 { MNT_QUOTA, 0, "with quotas" }, \
151 { MNT_ROOTFS, 1, "root file system" },
152
153 /*
154 * Mask of flags that are visible to statvfs()
155 */
156 #define MNT_VISFLAGMASK ( \
157 MNT_RDONLY | \
158 MNT_SYNCHRONOUS | \
159 MNT_NOEXEC | \
160 MNT_NOSUID | \
161 MNT_NODEV | \
162 MNT_UNION | \
163 MNT_ASYNC | \
164 MNT_NOCOREDUMP | \
165 MNT_IGNORE | \
166 MNT_NOATIME | \
167 MNT_SYMPERM | \
168 MNT_NODEVMTIME | \
169 MNT_SOFTDEP | \
170 MNT_EXRDONLY | \
171 MNT_EXPORTED | \
172 MNT_DEFEXPORTED | \
173 MNT_EXPORTANON | \
174 MNT_EXKERB | \
175 MNT_EXNORESPORT | \
176 MNT_EXPUBLIC | \
177 MNT_LOCAL | \
178 MNT_QUOTA | \
179 MNT_ROOTFS)
180
181 /*
182 * External filesystem control flags.
183 */
184 #define MNT_UPDATE 0x00010000 /* not a real mount, just an update */
185 #define MNT_RELOAD 0x00040000 /* reload filesystem data */
186 #define MNT_FORCE 0x00080000 /* force unmount or readonly change */
187 #define MNT_GETARGS 0x00400000 /* retrieve file system specific args */
188
189 #define __MNT_EXTERNAL_FLAGS \
190 { MNT_UPDATE, 1, "being updated" }, \
191 { MNT_RELOAD, 1, "reload filesystem data" }, \
192 { MNT_FORCE, 1, "force unmount or readonly change" }, \
193 { MNT_GETARGS, 1, "retrieve mount arguments" },
194
195 /*
196 * Internal filesystem control flags.
197 * These are set in struct mount mnt_iflag.
198 *
199 * IMNT_UNMOUNT locks the mount entry so that name lookup cannot proceed
200 * past the mount point. This keeps the subtree stable during mounts
201 * and unmounts.
202 */
203 #define IMNT_GONE 0x00000001 /* filesystem is gone.. */
204 #define IMNT_UNMOUNT 0x00000002 /* unmount in progress */
205 #define IMNT_WANTRDWR 0x00000004 /* upgrade to read/write requested */
206 #define IMNT_SUSPEND 0x00000008 /* request upper write suspension */
207 #define IMNT_SUSPENDLOW 0x00000010 /* request lower write suspension */
208 #define IMNT_SUSPENDED 0x00000020 /* write operations are suspended */
209 #define IMNT_DTYPE 0x00000040 /* returns d_type fields */
210
211 #define __MNT_FLAGS \
212 __MNT_BASIC_FLAGS \
213 __MNT_EXPORTED_FLAGS \
214 __MNT_INTERNAL_FLAGS \
215 __MNT_EXTERNAL_FLAGS
216
217 #define __MNT_FLAG_BITS \
218 "\2" \
219 "\40MNT_SOFTDEP" \
220 "\37MNT_NODEVMTIME" \
221 "\36MNT_SYMPERM" \
222 "\35MNT_EXPUBLIC" \
223 "\34MNT_EXNORESPORT" \
224 "\33MNT_NOATIME" \
225 "\32MNT_UNUSED" \
226 "\31MNT_UNUSED" \
227 "\30MNT_UNUSED" \
228 "\27MNT_GETARGS" \
229 "\26MNT_UNUSED" \
230 "\25MNT_IGNORE" \
231 "\24MNT_FORCE" \
232 "\23MNT_RELOAD" \
233 "\22MNT_UNUSED" \
234 "\21MNT_UPDATE" \
235 "\20MNT_NOCOREDUMP" \
236 "\17MNT_ROOTFS" \
237 "\16MNT_QUOTA" \
238 "\15MNT_LOCAL" \
239 "\14MNT_EXKERB" \
240 "\13MNT_EXPORTANON" \
241 "\12MNT_DEFEXPORTED" \
242 "\11MNT_EXPORTED" \
243 "\10MNT_EXRDONLY" \
244 "\07MNT_ASYNC" \
245 "\06MNT_UNION" \
246 "\05MNT_NODEV" \
247 "\04MNT_NOSUID" \
248 "\03MNT_NOEXEC" \
249 "\02MNT_SYNCHRONOUS" \
250 "\01MNT_RDONLY"
251
252 #define __IMNT_FLAG_BITS \
253 "\2" \
254 "\07IMNT_DTYPE" \
255 "\06IMNT_SUSPENDED" \
256 "\05IMNT_SUSPENDLOW" \
257 "\04IMNT_SUSPEND" \
258 "\03IMNT_WANTRDWR" \
259 "\02IMNT_UNMOUNT" \
260 "\01IMNT_GONE"
261
262 /*
263 * Flags for various system call interfaces.
264 *
265 * waitfor flags to vfs_sync() and getvfsstat()
266 */
267 #define MNT_WAIT 1 /* synchronously wait for I/O to complete */
268 #define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
269 #define MNT_LAZY 3 /* push data not written by filesystem syncer */
270 #endif /* _SYS_FSTYPES_H_ */
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