Merge FreeBSD rev. 1.8:
[dragonfly.git] / sys / sys / mount.h
CommitLineData
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1/*
2 * Copyright (c) 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)mount.h 8.21 (Berkeley) 5/20/95
34 * $FreeBSD: src/sys/sys/mount.h,v 1.89.2.7 2003/04/04 20:35:57 tegge Exp $
17030342 35 * $DragonFly: src/sys/sys/mount.h,v 1.8 2004/02/02 05:43:15 dillon Exp $
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36 */
37
38#ifndef _SYS_MOUNT_H_
39#define _SYS_MOUNT_H_
40
41#include <sys/ucred.h>
42
43#ifndef _KERNEL
44#if !defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE)
45#include <sys/stat.h>
46#endif /* !_POSIX_C_SOURCE */
47#endif /* !_KERNEL */
48
49#include <sys/queue.h>
50#ifdef _KERNEL
51#include <sys/lock.h>
52#endif
53
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54struct thread;
55
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56typedef struct fsid { int32_t val[2]; } fsid_t; /* file system id type */
57
58/*
59 * File identifier.
60 * These are unique per filesystem on a single machine.
61 */
62#define MAXFIDSZ 16
63
64struct fid {
65 u_short fid_len; /* length of data in bytes */
66 u_short fid_reserved; /* force longword alignment */
67 char fid_data[MAXFIDSZ]; /* data (variable length) */
68};
69
70/*
71 * file system statistics
72 */
73
74#define MFSNAMELEN 16 /* length of fs type name, including null */
984263bc 75#define MNAMELEN 80 /* length of buffer for returned name */
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76
77struct statfs {
78 long f_spare2; /* placeholder */
79 long f_bsize; /* fundamental file system block size */
80 long f_iosize; /* optimal transfer block size */
81 long f_blocks; /* total data blocks in file system */
82 long f_bfree; /* free blocks in fs */
83 long f_bavail; /* free blocks avail to non-superuser */
84 long f_files; /* total file nodes in file system */
85 long f_ffree; /* free file nodes in fs */
86 fsid_t f_fsid; /* file system id */
87 uid_t f_owner; /* user that mounted the filesystem */
88 int f_type; /* type of filesystem */
89 int f_flags; /* copy of mount exported flags */
90 long f_syncwrites; /* count of sync writes since mount */
91 long f_asyncwrites; /* count of async writes since mount */
92 char f_fstypename[MFSNAMELEN]; /* fs type name */
93 char f_mntonname[MNAMELEN]; /* directory on which mounted */
94 long f_syncreads; /* count of sync reads since mount */
95 long f_asyncreads; /* count of async reads since mount */
96 short f_spares1; /* unused spare */
97 char f_mntfromname[MNAMELEN];/* mounted filesystem */
98 short f_spares2; /* unused spare */
99 long f_spare[2]; /* unused spare */
100};
101
ec12abe0 102#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
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103/*
104 * Structure per mounted file system. Each mounted file system has an
105 * array of operations and an instance record. The file systems are
106 * put on a doubly linked list.
107 *
108 * NOTE: mnt_nvnodelist and mnt_reservedvnlist. At the moment vnodes
109 * are linked into mnt_nvnodelist. At some point in the near future the
110 * vnode list will be split into a 'dirty' and 'clean' list. mnt_nvnodelist
111 * will become the dirty list and mnt_reservedvnlist will become the 'clean'
112 * list. Filesystem kld's syncing code should remain compatible since
113 * they only need to scan the dirty vnode list (nvnodelist -> dirtyvnodelist).
114 */
115TAILQ_HEAD(vnodelst, vnode);
116
117struct mount {
118 TAILQ_ENTRY(mount) mnt_list; /* mount list */
119 struct vfsops *mnt_op; /* operations on fs */
120 struct vfsconf *mnt_vfc; /* configuration info */
121 struct vnode *mnt_vnodecovered; /* vnode we mounted on */
122 struct vnode *mnt_syncer; /* syncer vnode */
123 struct vnodelst mnt_nvnodelist; /* list of vnodes this mount */
124 struct lock mnt_lock; /* mount structure lock */
125 int mnt_flag; /* flags shared with user */
126 int mnt_kern_flag; /* kernel only flags */
127 int mnt_maxsymlinklen; /* max size of short symlink */
128 struct statfs mnt_stat; /* cache of filesystem stats */
129 qaddr_t mnt_data; /* private data */
130 time_t mnt_time; /* last time written*/
131 u_int mnt_iosize_max; /* max IO request size */
132 struct vnodelst mnt_reservedvnlist; /* (future) dirty vnode list */
133 int mnt_nvnodelistsize; /* # of vnodes on this mount */
134};
ec12abe0 135#endif /* _KERNEL || _KERNEL_STRUCTURES */
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136
137/*
138 * User specifiable flags.
139 */
140#define MNT_RDONLY 0x00000001 /* read only filesystem */
141#define MNT_SYNCHRONOUS 0x00000002 /* file system written synchronously */
142#define MNT_NOEXEC 0x00000004 /* can't exec from filesystem */
143#define MNT_NOSUID 0x00000008 /* don't honor setuid bits on fs */
144#define MNT_NODEV 0x00000010 /* don't interpret special files */
145#define MNT_UNION 0x00000020 /* union with underlying filesystem */
146#define MNT_ASYNC 0x00000040 /* file system written asynchronously */
147#define MNT_SUIDDIR 0x00100000 /* special handling of SUID on dirs */
148#define MNT_SOFTDEP 0x00200000 /* soft updates being done */
149#define MNT_NOSYMFOLLOW 0x00400000 /* do not follow symlinks */
150#define MNT_NOATIME 0x10000000 /* disable update of file access time */
151#define MNT_NOCLUSTERR 0x40000000 /* disable cluster read */
152#define MNT_NOCLUSTERW 0x80000000 /* disable cluster write */
153
154/*
155 * NFS export related mount flags.
156 */
157#define MNT_EXRDONLY 0x00000080 /* exported read only */
158#define MNT_EXPORTED 0x00000100 /* file system is exported */
159#define MNT_DEFEXPORTED 0x00000200 /* exported to the world */
160#define MNT_EXPORTANON 0x00000400 /* use anon uid mapping for everyone */
161#define MNT_EXKERB 0x00000800 /* exported with Kerberos uid mapping */
162#define MNT_EXPUBLIC 0x20000000 /* public export (WebNFS) */
163
164/*
165 * Flags set by internal operations,
166 * but visible to the user.
167 * XXX some of these are not quite right.. (I've never seen the root flag set)
168 */
169#define MNT_LOCAL 0x00001000 /* filesystem is stored locally */
170#define MNT_QUOTA 0x00002000 /* quotas are enabled on filesystem */
171#define MNT_ROOTFS 0x00004000 /* identifies the root filesystem */
172#define MNT_USER 0x00008000 /* mounted by a user */
173#define MNT_IGNORE 0x00800000 /* do not show entry in df */
174
175/*
176 * Mask of flags that are visible to statfs()
177 * XXX I think that this could now become (~(MNT_CMDFLAGS))
178 * but the 'mount' program may need changing to handle this.
179 */
180#define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \
181 MNT_NOSUID | MNT_NODEV | MNT_UNION | \
182 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
183 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \
184 MNT_LOCAL | MNT_USER | MNT_QUOTA | \
185 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \
186 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \
187 MNT_IGNORE | MNT_NOSYMFOLLOW | MNT_EXPUBLIC )
188/*
189 * External filesystem command modifier flags.
190 * Unmount can use the MNT_FORCE flag.
191 * XXX These are not STATES and really should be somewhere else.
192 */
193#define MNT_UPDATE 0x00010000 /* not a real mount, just an update */
194#define MNT_DELEXPORT 0x00020000 /* delete export host lists */
195#define MNT_RELOAD 0x00040000 /* reload filesystem data */
196#define MNT_FORCE 0x00080000 /* force unmount or readonly change */
197#define MNT_CMDFLAGS (MNT_UPDATE|MNT_DELEXPORT|MNT_RELOAD|MNT_FORCE)
198/*
199 * Internal filesystem control flags stored in mnt_kern_flag.
200 *
201 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
202 * past the mount point. This keeps the subtree stable during mounts
203 * and unmounts.
204 *
205 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
206 * dounmount() is still waiting to lock the mountpoint. This allows
207 * the filesystem to cancel operations that might otherwise deadlock
208 * with the unmount attempt (used by NFS).
209 */
210#define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
211#define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
212#define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
213#define MNTK_WANTRDWR 0x04000000 /* upgrade to read/write requested */
214
215/*
216 * Sysctl CTL_VFS definitions.
217 *
218 * Second level identifier specifies which filesystem. Second level
219 * identifier VFS_VFSCONF returns information about all filesystems.
220 * Second level identifier VFS_GENERIC is non-terminal.
221 */
222#define VFS_VFSCONF 0 /* get configured filesystems */
223#define VFS_GENERIC 0 /* generic filesystem information */
224/*
225 * Third level identifiers for VFS_GENERIC are given below; third
226 * level identifiers for specific filesystems are given in their
227 * mount specific header files.
228 */
229#define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */
230#define VFS_CONF 2 /* struct: vfsconf for filesystem given
231 as next argument */
232
233/*
234 * Flags for various system call interfaces.
235 *
236 * waitfor flags to vfs_sync() and getfsstat()
237 */
238#define MNT_WAIT 1 /* synchronously wait for I/O to complete */
239#define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
240#define MNT_LAZY 3 /* push data not written by filesystem syncer */
241
242/*
243 * Generic file handle
244 */
245struct fhandle {
246 fsid_t fh_fsid; /* File system id of mount point */
247 struct fid fh_fid; /* File sys specific id */
248};
249typedef struct fhandle fhandle_t;
250
251/*
252 * Export arguments for local filesystem mount calls.
253 */
254struct export_args {
255 int ex_flags; /* export related flags */
256 uid_t ex_root; /* mapping for root uid */
257 struct ucred ex_anon; /* mapping for anonymous user */
258 struct sockaddr *ex_addr; /* net address to which exported */
259 int ex_addrlen; /* and the net address length */
260 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
261 int ex_masklen; /* and the smask length */
262 char *ex_indexfile; /* index file for WebNFS URLs */
263};
264
265/*
266 * Structure holding information for a publicly exported filesystem
267 * (WebNFS). Currently the specs allow just for one such filesystem.
268 */
269struct nfs_public {
270 int np_valid; /* Do we hold valid information */
271 fhandle_t np_handle; /* Filehandle for pub fs (internal) */
272 struct mount *np_mount; /* Mountpoint of exported fs */
273 char *np_index; /* Index file */
274};
275
276/*
277 * Filesystem configuration information. One of these exists for each
278 * type of filesystem supported by the kernel. These are searched at
279 * mount time to identify the requested filesystem.
280 */
281struct vfsconf {
282 struct vfsops *vfc_vfsops; /* filesystem operations vector */
283 char vfc_name[MFSNAMELEN]; /* filesystem type name */
284 int vfc_typenum; /* historic filesystem type number */
285 int vfc_refcount; /* number mounted of this type */
286 int vfc_flags; /* permanent flags */
287 struct vfsconf *vfc_next; /* next in list */
288};
289
290struct ovfsconf {
291 void *vfc_vfsops;
292 char vfc_name[32];
293 int vfc_index;
294 int vfc_refcount;
295 int vfc_flags;
296};
297
298/*
299 * NB: these flags refer to IMPLEMENTATION properties, not properties of
300 * any actual mounts; i.e., it does not make sense to change the flags.
301 */
302#define VFCF_STATIC 0x00010000 /* statically compiled into kernel */
303#define VFCF_NETWORK 0x00020000 /* may get data over the network */
304#define VFCF_READONLY 0x00040000 /* writes are not implemented */
305#define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */
306#define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */
307#define VFCF_UNICODE 0x00200000 /* stores file names as Unicode*/
308
309#ifdef _KERNEL
310
311#ifdef MALLOC_DECLARE
312MALLOC_DECLARE(M_MOUNT);
313#endif
314extern int maxvfsconf; /* highest defined filesystem type */
315extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */
316extern struct vfsconf *vfsconf; /* head of list of filesystem types */
317
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318#endif
319
320#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
321
322TAILQ_HEAD(mntlist, mount); /* struct mntlist */
323
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324/*
325 * Operations supported on mounted file system.
326 */
327#ifdef __STDC__
328struct nameidata;
329struct mbuf;
330#endif
331
332struct vfsops {
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333 int (*vfs_mount) (struct mount *mp, char *path, caddr_t data,
334 struct nameidata *ndp, struct thread *td);
335 int (*vfs_start) (struct mount *mp, int flags,
336 struct thread *td);
337 int (*vfs_unmount) (struct mount *mp, int mntflags,
338 struct thread *td);
339 int (*vfs_root) (struct mount *mp, struct vnode **vpp);
340 int (*vfs_quotactl) (struct mount *mp, int cmds, uid_t uid,
341 caddr_t arg, struct thread *td);
342 int (*vfs_statfs) (struct mount *mp, struct statfs *sbp,
343 struct thread *td);
344 int (*vfs_sync) (struct mount *mp, int waitfor,
345 struct thread *td);
346 int (*vfs_vget) (struct mount *mp, ino_t ino,
347 struct vnode **vpp);
348 int (*vfs_fhtovp) (struct mount *mp, struct fid *fhp,
349 struct vnode **vpp);
350 int (*vfs_checkexp) (struct mount *mp, struct sockaddr *nam,
351 int *extflagsp, struct ucred **credanonp);
352 int (*vfs_vptofh) (struct vnode *vp, struct fid *fhp);
353 int (*vfs_init) (struct vfsconf *);
354 int (*vfs_uninit) (struct vfsconf *);
355 int (*vfs_extattrctl) (struct mount *mp, int cmd,
984263bc 356 const char *attrname, caddr_t arg,
b153f746 357 struct thread *td);
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358};
359
360#define VFS_MOUNT(MP, PATH, DATA, NDP, P) \
361 (*(MP)->mnt_op->vfs_mount)(MP, PATH, DATA, NDP, P)
362#define VFS_START(MP, FLAGS, P) (*(MP)->mnt_op->vfs_start)(MP, FLAGS, P)
363#define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P)
364#define VFS_ROOT(MP, VPP) (*(MP)->mnt_op->vfs_root)(MP, VPP)
365#define VFS_QUOTACTL(MP,C,U,A,P) (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P)
366#define VFS_STATFS(MP, SBP, P) (*(MP)->mnt_op->vfs_statfs)(MP, SBP, P)
3b568787 367#define VFS_SYNC(MP, WAIT, P) (*(MP)->mnt_op->vfs_sync)(MP, WAIT, P)
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368#define VFS_VGET(MP, INO, VPP) (*(MP)->mnt_op->vfs_vget)(MP, INO, VPP)
369#define VFS_FHTOVP(MP, FIDP, VPP) \
370 (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP)
371#define VFS_VPTOFH(VP, FIDP) (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP)
372#define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \
373 (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED)
374#define VFS_EXTATTRCTL(MP, C, N, A, P) \
375 (*(MP)->mnt_op->vfs_extattrctl)(MP, C, N, A, P)
376
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377#endif
378
379#ifdef _KERNEL
380
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381#include <sys/module.h>
382
383#define VFS_SET(vfsops, fsname, flags) \
384 static struct vfsconf fsname ## _vfsconf = { \
385 &vfsops, \
386 #fsname, \
387 -1, \
388 0, \
389 flags \
390 }; \
391 static moduledata_t fsname ## _mod = { \
392 #fsname, \
393 vfs_modevent, \
394 & fsname ## _vfsconf \
395 }; \
396 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
397
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398#endif
399
400#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
401
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402#include <net/radix.h>
403
404#define AF_MAX 33 /* XXX */
405
406/*
407 * Network address lookup element
408 */
409struct netcred {
410 struct radix_node netc_rnodes[2];
411 int netc_exflags;
412 struct ucred netc_anon;
413};
414
415/*
416 * Network export information
417 */
418struct netexport {
419 struct netcred ne_defexported; /* Default export */
420 struct radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
421};
422
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423#endif
424
425#ifdef _KERNEL
426
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427extern char *mountrootfsname;
428
429/*
430 * exported vnode operations
431 */
b153f746 432int dounmount (struct mount *, int, struct thread *);
984263bc 433int vfs_setpublicfs /* set publicly exported fs */
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434 (struct mount *, struct netexport *, struct export_args *);
435int vfs_lock (struct mount *); /* lock a vfs */
436void vfs_msync (struct mount *, int);
437void vfs_unlock (struct mount *); /* unlock a vfs */
438int vfs_busy (struct mount *, int, struct lwkt_token *, struct thread *);
984263bc 439int vfs_export /* process mount export info */
b153f746 440 (struct mount *, struct netexport *, struct export_args *);
984263bc 441struct netcred *vfs_export_lookup /* lookup host in fs export list */
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442 (struct mount *, struct netexport *, struct sockaddr *);
443int vfs_allocate_syncvnode (struct mount *);
444void vfs_getnewfsid (struct mount *);
445dev_t vfs_getrootfsid (struct mount *);
446struct mount *vfs_getvfs (fsid_t *); /* return vfs given fsid */
447int vfs_modevent (module_t, int, void *);
448int vfs_mountedon (struct vnode *); /* is a vfs mounted on vp */
449int vfs_rootmountalloc (char *, char *, struct mount **);
450void vfs_unbusy (struct mount *, struct thread *);
451void vfs_unmountall (void);
452int vfs_register (struct vfsconf *);
453int vfs_unregister (struct vfsconf *);
ec12abe0 454extern struct mntlist mountlist; /* mounted filesystem list */
8a8d5d85 455extern struct lwkt_token mountlist_token;
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456extern struct nfs_public nfs_pub;
457
458/*
459 * Declarations for these vfs default operations are located in
460 * kern/vfs_default.c, they should be used instead of making "dummy"
461 * functions or casting entries in the VFS op table to "enopnotsupp()".
462 */
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463int vfs_stdmount (struct mount *mp, char *path, caddr_t data,
464 struct nameidata *ndp, struct thread *p);
465int vfs_stdstart (struct mount *mp, int flags, struct thread *p);
466int vfs_stdunmount (struct mount *mp, int mntflags, struct thread *p);
467int vfs_stdroot (struct mount *mp, struct vnode **vpp);
468int vfs_stdquotactl (struct mount *mp, int cmds, uid_t uid,
469 caddr_t arg, struct thread *p);
470int vfs_stdstatfs (struct mount *mp, struct statfs *sbp, struct thread *p);
471int vfs_stdsync (struct mount *mp, int waitfor, struct thread *td);
472int vfs_stdvget (struct mount *mp, ino_t ino, struct vnode **vpp);
473int vfs_stdfhtovp (struct mount *mp, struct fid *fhp, struct vnode **vpp);
474int vfs_stdcheckexp (struct mount *mp, struct sockaddr *nam,
475 int *extflagsp, struct ucred **credanonp);
476int vfs_stdvptofh (struct vnode *vp, struct fid *fhp);
477int vfs_stdinit (struct vfsconf *);
478int vfs_stduninit (struct vfsconf *);
479int vfs_stdextattrctl (struct mount *mp, int cmd, const char *attrname,
480 caddr_t arg, struct thread *p);
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481
482#else /* !_KERNEL */
483
484#include <sys/cdefs.h>
485
486__BEGIN_DECLS
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487int fstatfs (int, struct statfs *);
488int getfh (const char *, fhandle_t *);
489int getfsstat (struct statfs *, long, int);
490int getmntinfo (struct statfs **, int);
491int mount (const char *, const char *, int, void *);
492int statfs (const char *, struct statfs *);
493int unmount (const char *, int);
494int fhopen (const struct fhandle *, int);
495int fhstat (const struct fhandle *, struct stat *);
496int fhstatfs (const struct fhandle *, struct statfs *);
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497
498/* C library stuff */
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499void endvfsent (void);
500struct ovfsconf *getvfsbyname (const char *);
501struct ovfsconf *getvfsbytype (int);
502struct ovfsconf *getvfsent (void);
984263bc 503#define getvfsbyname new_getvfsbyname
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504int new_getvfsbyname (const char *, struct vfsconf *);
505void setvfsent (int);
506int vfsisloadable (const char *);
507int vfsload (const char *);
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508__END_DECLS
509
510#endif /* _KERNEL */
511
512#endif /* !_SYS_MOUNT_H_ */
ec12abe0 513