2 * Copyright (c) 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)mount.h 8.21 (Berkeley) 5/20/95
36 #include <sys/ucred.h>
37 #include <sys/queue.h>
40 #include <sys/lockmgr.h>
41 #include <sys/_mutex.h>
45 * NOTE: When changing statfs structure, mount structure, MNT_* flags or
46 * MNTK_* flags also update DDB show mount command in vfs_subr.c.
49 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
53 * These are unique per filesystem on a single machine.
58 u_short fid_len; /* length of data in bytes */
59 u_short fid_data0; /* force longword alignment */
60 char fid_data[MAXFIDSZ]; /* data (variable length) */
64 * filesystem statistics
66 #define MFSNAMELEN 16 /* length of type name including null */
67 #define MNAMELEN 88 /* size of on/from name bufs */
68 #define STATFS_VERSION 0x20030518 /* current version number */
70 uint32_t f_version; /* structure version number */
71 uint32_t f_type; /* type of filesystem */
72 uint64_t f_flags; /* copy of mount exported flags */
73 uint64_t f_bsize; /* filesystem fragment size */
74 uint64_t f_iosize; /* optimal transfer block size */
75 uint64_t f_blocks; /* total data blocks in filesystem */
76 uint64_t f_bfree; /* free blocks in filesystem */
77 int64_t f_bavail; /* free blocks avail to non-superuser */
78 uint64_t f_files; /* total file nodes in filesystem */
79 int64_t f_ffree; /* free nodes avail to non-superuser */
80 uint64_t f_syncwrites; /* count of sync writes since mount */
81 uint64_t f_asyncwrites; /* count of async writes since mount */
82 uint64_t f_syncreads; /* count of sync reads since mount */
83 uint64_t f_asyncreads; /* count of async reads since mount */
84 uint64_t f_spare[10]; /* unused spare */
85 uint32_t f_namemax; /* maximum filename length */
86 uid_t f_owner; /* user that mounted the filesystem */
87 fsid_t f_fsid; /* filesystem id */
88 char f_charspare[80]; /* spare string space */
89 char f_fstypename[MFSNAMELEN]; /* filesystem type name */
90 char f_mntfromname[MNAMELEN]; /* mounted filesystem */
91 char f_mntonname[MNAMELEN]; /* directory on which mounted */
95 #define OMFSNAMELEN 16 /* length of fs type name, including null */
96 #define OMNAMELEN (88 - 2 * sizeof(long)) /* size of on/from name bufs */
98 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
99 /* XXX statfs.2 is out of date with read counter changes here. */
101 long f_spare2; /* placeholder */
102 long f_bsize; /* fundamental filesystem block size */
103 long f_iosize; /* optimal transfer block size */
104 long f_blocks; /* total data blocks in filesystem */
105 long f_bfree; /* free blocks in fs */
106 long f_bavail; /* free blocks avail to non-superuser */
107 long f_files; /* total file nodes in filesystem */
108 long f_ffree; /* free file nodes in fs */
109 fsid_t f_fsid; /* filesystem id */
110 uid_t f_owner; /* user that mounted the filesystem */
111 int f_type; /* type of filesystem */
112 int f_flags; /* copy of mount exported flags */
113 long f_syncwrites; /* count of sync writes since mount */
114 long f_asyncwrites; /* count of async writes since mount */
115 char f_fstypename[OMFSNAMELEN]; /* fs type name */
116 char f_mntonname[OMNAMELEN]; /* directory on which mounted */
117 long f_syncreads; /* count of sync reads since mount */
118 long f_asyncreads; /* count of async reads since mount */
119 short f_spares1; /* unused spare */
120 char f_mntfromname[OMNAMELEN];/* mounted filesystem */
121 short f_spares2; /* unused spare */
123 * XXX on machines where longs are aligned to 8-byte boundaries, there
124 * is an unnamed int32_t here. This spare was after the apparent end
125 * of the struct until we bit off the read counters from f_mntonname.
127 long f_spare[2]; /* unused spare */
130 TAILQ_HEAD(vnodelst, vnode);
132 /* Mount options list */
133 TAILQ_HEAD(vfsoptlist, vfsopt);
135 TAILQ_ENTRY(vfsopt) link;
144 * Structure per mounted filesystem. Each mounted filesystem has an
145 * array of operations and an instance record. The filesystems are
146 * put on a doubly linked list.
152 * Unmarked fields are considered stable as long as a ref is held.
156 struct mtx mnt_mtx; /* mount structure interlock */
157 int mnt_gen; /* struct mount generation */
158 #define mnt_startzero mnt_list
159 TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */
160 struct vfsops *mnt_op; /* operations on fs */
161 struct vfsconf *mnt_vfc; /* configuration info */
162 struct vnode *mnt_vnodecovered; /* vnode we mounted on */
163 struct vnode *mnt_syncer; /* syncer vnode */
164 int mnt_ref; /* (i) Reference count */
165 struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */
166 int mnt_nvnodelistsize; /* (i) # of vnodes */
167 int mnt_writeopcount; /* (i) write syscalls pending */
168 int mnt_kern_flag; /* (i) kernel only flags */
169 u_int mnt_flag; /* (i) flags shared with user */
170 u_int mnt_xflag; /* (i) more flags shared with user */
171 u_int mnt_noasync; /* (i) # noasync overrides */
172 struct vfsoptlist *mnt_opt; /* current mount options */
173 struct vfsoptlist *mnt_optnew; /* new options passed to fs */
174 int mnt_maxsymlinklen; /* max size of short symlink */
175 struct statfs mnt_stat; /* cache of filesystem stats */
176 struct ucred *mnt_cred; /* credentials of mounter */
177 void * mnt_data; /* private data */
178 time_t mnt_time; /* last time written*/
179 int mnt_iosize_max; /* max size for clusters, etc */
180 struct netexport *mnt_export; /* export list */
181 struct label *mnt_label; /* MAC label for the fs */
182 u_int mnt_hashseed; /* Random seed for vfs_hash */
183 int mnt_lockref; /* (i) Lock reference count */
184 int mnt_secondary_writes; /* (i) # of secondary writes */
185 int mnt_secondary_accwrites;/* (i) secondary wr. starts */
186 struct thread *mnt_susp_owner; /* (i) thread owning suspension */
187 #define mnt_endzero mnt_gjprovider
188 char *mnt_gjprovider; /* gjournal provider name */
189 struct lock mnt_explock; /* vfs_export walkers lock */
192 struct vnode *__mnt_vnode_next(struct vnode **mvp, struct mount *mp);
193 struct vnode *__mnt_vnode_first(struct vnode **mvp, struct mount *mp);
194 void __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp);
196 #define MNT_VNODE_FOREACH(vp, mp, mvp) \
197 for (vp = __mnt_vnode_first(&(mvp), (mp)); \
198 (vp) != NULL; vp = __mnt_vnode_next(&(mvp), (mp)))
200 #define MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp) \
201 __mnt_vnode_markerfree(&(mvp), (mp))
203 #define MNT_VNODE_FOREACH_ABORT(mp, mvp) \
206 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); \
210 #define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx)
211 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
212 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
213 #define MNT_MTX(mp) (&(mp)->mnt_mtx)
214 #define MNT_REF(mp) (mp)->mnt_ref++
215 #define MNT_REL(mp) do { \
216 KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref")); \
218 if ((mp)->mnt_ref == 0) \
225 * User specifiable flags, stored in mnt_flag.
227 #define MNT_RDONLY 0x00000001 /* read only filesystem */
228 #define MNT_SYNCHRONOUS 0x00000002 /* filesystem written synchronously */
229 #define MNT_NOEXEC 0x00000004 /* can't exec from filesystem */
230 #define MNT_NOSUID 0x00000008 /* don't honor setuid bits on fs */
231 #define MNT_UNION 0x00000020 /* union with underlying filesystem */
232 #define MNT_ASYNC 0x00000040 /* filesystem written asynchronously */
233 #define MNT_SUIDDIR 0x00100000 /* special handling of SUID on dirs */
234 #define MNT_SOFTDEP 0x00200000 /* soft updates being done */
235 #define MNT_NOSYMFOLLOW 0x00400000 /* do not follow symlinks */
236 #define MNT_GJOURNAL 0x02000000 /* GEOM journal support enabled */
237 #define MNT_MULTILABEL 0x04000000 /* MAC support for individual objects */
238 #define MNT_ACLS 0x08000000 /* ACL support enabled */
239 #define MNT_NOATIME 0x10000000 /* disable update of file access time */
240 #define MNT_NOCLUSTERR 0x40000000 /* disable cluster read */
241 #define MNT_NOCLUSTERW 0x80000000 /* disable cluster write */
242 #define MNT_NFS4ACLS 0x00000010
245 * NFS export related mount flags.
247 #define MNT_EXRDONLY 0x00000080 /* exported read only */
248 #define MNT_EXPORTED 0x00000100 /* filesystem is exported */
249 #define MNT_DEFEXPORTED 0x00000200 /* exported to the world */
250 #define MNT_EXPORTANON 0x00000400 /* use anon uid mapping for everyone */
251 #define MNT_EXKERB 0x00000800 /* exported with Kerberos uid mapping */
252 #define MNT_EXPUBLIC 0x20000000 /* public export (WebNFS) */
255 * Flags set by internal operations,
256 * but visible to the user.
257 * XXX some of these are not quite right.. (I've never seen the root flag set)
259 #define MNT_LOCAL 0x00001000 /* filesystem is stored locally */
260 #define MNT_QUOTA 0x00002000 /* quotas are enabled on filesystem */
261 #define MNT_ROOTFS 0x00004000 /* identifies the root filesystem */
262 #define MNT_USER 0x00008000 /* mounted by a user */
263 #define MNT_IGNORE 0x00800000 /* do not show entry in df */
266 * Mask of flags that are visible to statfs().
267 * XXX I think that this could now become (~(MNT_CMDFLAGS))
268 * but the 'mount' program may need changing to handle this.
270 #define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \
271 MNT_NOSUID | MNT_UNION | \
272 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
273 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \
274 MNT_LOCAL | MNT_USER | MNT_QUOTA | \
275 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \
276 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \
277 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \
278 MNT_GJOURNAL | MNT_MULTILABEL | MNT_ACLS | MNT_NFS4ACLS)
280 /* Mask of flags that can be updated. */
281 #define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \
282 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \
284 MNT_NOSYMFOLLOW | MNT_IGNORE | \
285 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \
286 MNT_ACLS | MNT_USER | MNT_NFS4ACLS)
289 * External filesystem command modifier flags.
290 * Unmount can use the MNT_FORCE flag.
291 * XXX: These are not STATES and really should be somewhere else.
292 * XXX: MNT_BYFSID collides with MNT_ACLS, but because MNT_ACLS is only used for
293 * mount(2) and MNT_BYFSID is only used for unmount(2) it's harmless.
295 #define MNT_UPDATE 0x00010000 /* not a real mount, just an update */
296 #define MNT_DELEXPORT 0x00020000 /* delete export host lists */
297 #define MNT_RELOAD 0x00040000 /* reload filesystem data */
298 #define MNT_FORCE 0x00080000 /* force unmount or readonly change */
299 #define MNT_SNAPSHOT 0x01000000 /* snapshot the filesystem */
300 #define MNT_BYFSID 0x08000000 /* specify filesystem by ID. */
301 #define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \
302 MNT_FORCE | MNT_SNAPSHOT | MNT_BYFSID)
304 * Internal filesystem control flags stored in mnt_kern_flag.
306 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
307 * past the mount point. This keeps the subtree stable during mounts
310 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
311 * dounmount() is still waiting to lock the mountpoint. This allows
312 * the filesystem to cancel operations that might otherwise deadlock
313 * with the unmount attempt (used by NFS).
315 * MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated
316 * to allow for failed unmount attempt to restore the syncer vnode for
319 #define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
320 #define MNTK_ASYNC 0x00000002 /* filtered async flag */
321 #define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */
322 #define MNTK_NOINSMNTQ 0x00000008 /* insmntque is not allowed */
323 #define MNTK_DRAINING 0x00000010 /* lock draining is happening */
324 #define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */
325 #define MNTK_EXTENDED_SHARED 0x00000040 /* Allow shared locking for more ops */
326 #define MNTK_SHARED_WRITES 0x00000080 /* Allow shared locking for writes */
327 #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
328 #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
329 #define MNTK_SUSPEND 0x08000000 /* request write suspension */
330 #define MNTK_SUSPEND2 0x04000000 /* block secondary writes */
331 #define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */
332 #define MNTK_MPSAFE 0x20000000 /* Filesystem is MPSAFE. */
333 #define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */
334 #define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */
336 #define MNT_SHARED_WRITES(mp) (((mp) != NULL) && \
337 ((mp)->mnt_kern_flag & MNTK_SHARED_WRITES))
340 * Sysctl CTL_VFS definitions.
342 * Second level identifier specifies which filesystem. Second level
343 * identifier VFS_VFSCONF returns information about all filesystems.
344 * Second level identifier VFS_GENERIC is non-terminal.
346 #define VFS_VFSCONF 0 /* get configured filesystems */
347 #define VFS_GENERIC 0 /* generic filesystem information */
349 * Third level identifiers for VFS_GENERIC are given below; third
350 * level identifiers for specific filesystems are given in their
351 * mount specific header files.
353 #define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */
354 #define VFS_CONF 2 /* struct: vfsconf for filesystem given
358 * Flags for various system call interfaces.
360 * waitfor flags to vfs_sync() and getfsstat()
362 #define MNT_WAIT 1 /* synchronously wait for I/O to complete */
363 #define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
364 #define MNT_LAZY 3 /* push data not written by filesystem syncer */
365 #define MNT_SUSPEND 4 /* Suspend file system after sync */
368 * Generic file handle
371 fsid_t fh_fsid; /* Filesystem id of mount point */
372 struct fid fh_fid; /* Filesys specific id */
374 typedef struct fhandle fhandle_t;
377 * Old export arguments without security flavor list
379 struct oexport_args {
380 int ex_flags; /* export related flags */
381 uid_t ex_root; /* mapping for root uid */
382 struct xucred ex_anon; /* mapping for anonymous user */
383 struct sockaddr *ex_addr; /* net address to which exported */
384 u_char ex_addrlen; /* and the net address length */
385 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
386 u_char ex_masklen; /* and the smask length */
387 char *ex_indexfile; /* index file for WebNFS URLs */
391 * Export arguments for local filesystem mount calls.
393 #define MAXSECFLAVORS 5
395 int ex_flags; /* export related flags */
396 uid_t ex_root; /* mapping for root uid */
397 struct xucred ex_anon; /* mapping for anonymous user */
398 struct sockaddr *ex_addr; /* net address to which exported */
399 u_char ex_addrlen; /* and the net address length */
400 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
401 u_char ex_masklen; /* and the smask length */
402 char *ex_indexfile; /* index file for WebNFS URLs */
403 int ex_numsecflavors; /* security flavor count */
404 int ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
408 * Structure holding information for a publicly exported filesystem
409 * (WebNFS). Currently the specs allow just for one such filesystem.
412 int np_valid; /* Do we hold valid information */
413 fhandle_t np_handle; /* Filehandle for pub fs (internal) */
414 struct mount *np_mount; /* Mountpoint of exported fs */
415 char *np_index; /* Index file */
419 * Filesystem configuration information. One of these exists for each
420 * type of filesystem supported by the kernel. These are searched at
421 * mount time to identify the requested filesystem.
423 * XXX: Never change the first two arguments!
426 u_int vfc_version; /* ABI version number */
427 char vfc_name[MFSNAMELEN]; /* filesystem type name */
428 struct vfsops *vfc_vfsops; /* filesystem operations vector */
429 int vfc_typenum; /* historic filesystem type number */
430 int vfc_refcount; /* number mounted of this type */
431 int vfc_flags; /* permanent flags */
432 struct vfsoptdecl *vfc_opts; /* mount options */
433 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */
436 /* Userland version of the struct vfsconf. */
438 struct vfsops *vfc_vfsops; /* filesystem operations vector */
439 char vfc_name[MFSNAMELEN]; /* filesystem type name */
440 int vfc_typenum; /* historic filesystem type number */
441 int vfc_refcount; /* number mounted of this type */
442 int vfc_flags; /* permanent flags */
443 struct vfsconf *vfc_next; /* next in list */
457 * NB: these flags refer to IMPLEMENTATION properties, not properties of
458 * any actual mounts; i.e., it does not make sense to change the flags.
460 #define VFCF_STATIC 0x00010000 /* statically compiled into kernel */
461 #define VFCF_NETWORK 0x00020000 /* may get data over the network */
462 #define VFCF_READONLY 0x00040000 /* writes are not implemented */
463 #define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */
464 #define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */
465 #define VFCF_UNICODE 0x00200000 /* stores file names as Unicode */
466 #define VFCF_JAIL 0x00400000 /* can be mounted from within a jail */
467 #define VFCF_DELEGADMIN 0x00800000 /* supports delegated administration */
468 #define VFCF_SBDRY 0x01000000 /* defer stop requests */
470 typedef uint32_t fsctlop_t;
473 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */
474 fsid_t vc_fsid; /* fsid to operate on */
475 char vc_fstypename[MFSNAMELEN];
476 /* type of fs 'nfs' or '*' */
477 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */
478 void *vc_ptr; /* pointer to data structure */
479 size_t vc_len; /* sizeof said structure */
480 u_int32_t vc_spare[12]; /* spare (must be zero) */
483 /* vfsidctl API version. */
484 #define VFS_CTL_VERS1 0x01
487 * New style VFS sysctls, do not reuse/conflict with the namespace for
489 * All "global" sysctl ops have the 33rd bit set:
491 * Private sysctl ops should have the 33rd bit unset.
493 #define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */
494 #define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */
495 #define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */
499 u_int32_t vq_spare[31];
503 #define VQ_NOTRESP 0x0001 /* server down */
504 #define VQ_NEEDAUTH 0x0002 /* server bad auth */
505 #define VQ_LOWDISK 0x0004 /* we're low on space */
506 #define VQ_MOUNT 0x0008 /* new filesystem arrived */
507 #define VQ_UNMOUNT 0x0010 /* filesystem has left */
508 #define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */
509 #define VQ_ASSIST 0x0040 /* filesystem needs assistance from external
511 #define VQ_NOTRESPLOCK 0x0080 /* server lockd down */
512 #define VQ_FLAG0100 0x0100 /* placeholder */
513 #define VQ_FLAG0200 0x0200 /* placeholder */
514 #define VQ_FLAG0400 0x0400 /* placeholder */
515 #define VQ_FLAG0800 0x0800 /* placeholder */
516 #define VQ_FLAG1000 0x1000 /* placeholder */
517 #define VQ_FLAG2000 0x2000 /* placeholder */
518 #define VQ_FLAG4000 0x4000 /* placeholder */
519 #define VQ_FLAG8000 0x8000 /* placeholder */
522 /* Point a sysctl request at a vfsidctl's data. */
523 #define VCTLTOREQ(vc, req) \
525 (req)->newptr = (vc)->vc_ptr; \
526 (req)->newlen = (vc)->vc_len; \
537 * vfs_busy specific flags and mask.
539 #define MBF_NOWAIT 0x01
540 #define MBF_MNTLSTLOCK 0x02
541 #define MBF_MASK (MBF_NOWAIT | MBF_MNTLSTLOCK)
543 #ifdef MALLOC_DECLARE
544 MALLOC_DECLARE(M_MOUNT);
546 extern int maxvfsconf; /* highest defined filesystem type */
547 extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */
549 TAILQ_HEAD(vfsconfhead, vfsconf);
550 extern struct vfsconfhead vfsconf;
553 * Operations supported on mounted filesystem.
560 typedef int vfs_cmount_t(struct mntarg *ma, void *data, int flags);
561 typedef int vfs_unmount_t(struct mount *mp, int mntflags);
562 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);
563 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg);
564 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp);
565 typedef int vfs_sync_t(struct mount *mp, int waitfor);
566 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
568 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp);
569 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
570 int *extflagsp, struct ucred **credanonp,
571 int *numsecflavors, int **secflavors);
572 typedef int vfs_init_t(struct vfsconf *);
573 typedef int vfs_uninit_t(struct vfsconf *);
574 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
575 struct vnode *filename_vp, int attrnamespace,
576 const char *attrname);
577 typedef int vfs_mount_t(struct mount *mp);
578 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
579 struct sysctl_req *req);
580 typedef void vfs_susp_clean_t(struct mount *mp);
583 vfs_mount_t *vfs_mount;
584 vfs_cmount_t *vfs_cmount;
585 vfs_unmount_t *vfs_unmount;
586 vfs_root_t *vfs_root;
587 vfs_quotactl_t *vfs_quotactl;
588 vfs_statfs_t *vfs_statfs;
589 vfs_sync_t *vfs_sync;
590 vfs_vget_t *vfs_vget;
591 vfs_fhtovp_t *vfs_fhtovp;
592 vfs_checkexp_t *vfs_checkexp;
593 vfs_init_t *vfs_init;
594 vfs_uninit_t *vfs_uninit;
595 vfs_extattrctl_t *vfs_extattrctl;
596 vfs_sysctl_t *vfs_sysctl;
597 vfs_susp_clean_t *vfs_susp_clean;
600 vfs_statfs_t __vfs_statfs;
602 #define VFS_NEEDSGIANT_(MP) \
603 ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0)
605 #define VFS_NEEDSGIANT(MP) __extension__ \
609 VFS_NEEDSGIANT_(_mp); \
612 #define VFS_LOCK_GIANT(MP) __extension__ \
617 if (VFS_NEEDSGIANT_(_mp)) { \
624 #define VFS_UNLOCK_GIANT(locked) if ((locked)) mtx_unlock(&Giant);
625 #define VFS_ASSERT_GIANT(MP) do \
629 if (VFS_NEEDSGIANT_(_mp)) \
630 mtx_assert(&Giant, MA_OWNED); \
633 #define VFS_PROLOGUE(MP) do { \
636 _enable_stops = ((MP) != NULL && \
637 ((MP)->mnt_vfc->vfc_flags & VFCF_SBDRY) && sigdeferstop())
639 #define VFS_EPILOGUE(MP) \
644 #define VFS_MOUNT(MP) ({ \
648 _rc = (*(MP)->mnt_op->vfs_mount)(MP); \
652 #define VFS_UNMOUNT(MP, FORCE) ({ \
656 _rc = (*(MP)->mnt_op->vfs_unmount)(MP, FORCE); \
660 #define VFS_ROOT(MP, FLAGS, VPP) ({ \
664 _rc = (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP); \
668 #define VFS_QUOTACTL(MP, C, U, A) ({ \
672 _rc = (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A); \
676 #define VFS_STATFS(MP, SBP) ({ \
680 _rc = __vfs_statfs((MP), (SBP)); \
684 #define VFS_SYNC(MP, WAIT) ({ \
688 _rc = (*(MP)->mnt_op->vfs_sync)(MP, WAIT); \
692 #define VFS_VGET(MP, INO, FLAGS, VPP) ({ \
696 _rc = (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP); \
700 #define VFS_FHTOVP(MP, FIDP, VPP) ({ \
704 _rc = (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP); \
708 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) ({ \
712 _rc = (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC,\
717 #define VFS_EXTATTRCTL(MP, C, FN, NS, N) ({ \
721 _rc = (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N); \
725 #define VFS_SYSCTL(MP, OP, REQ) ({ \
729 _rc = (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ); \
733 #define VFS_SUSP_CLEAN(MP) do { \
734 if (*(MP)->mnt_op->vfs_susp_clean != NULL) { \
736 (*(MP)->mnt_op->vfs_susp_clean)(MP); \
741 #define VFS_RECLAIM_LOWERVP(MP, VP) do { \
742 if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) { \
744 (*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP)); \
749 #define VFS_KNOTE_LOCKED(vp, hint) do \
751 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
752 VN_KNOTE((vp), (hint), KNF_LISTLOCKED); \
755 #define VFS_KNOTE_UNLOCKED(vp, hint) do \
757 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
758 VN_KNOTE((vp), (hint), 0); \
761 #include <sys/module.h>
766 #define VFS_VERSION_00 0x19660120
767 #define VFS_VERSION VFS_VERSION_00
769 #define VFS_SET(vfsops, fsname, flags) \
770 static struct vfsconf fsname ## _vfsconf = { \
771 .vfc_version = VFS_VERSION, \
772 .vfc_name = #fsname, \
773 .vfc_vfsops = &vfsops, \
775 .vfc_flags = flags, \
777 static moduledata_t fsname ## _mod = { \
780 & fsname ## _vfsconf \
782 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
784 extern char *mountrootfsname;
787 * exported vnode operations
790 int dounmount(struct mount *, int, struct thread *);
792 int kernel_mount(struct mntarg *ma, int flags);
793 int kernel_vmount(int flags, ...);
794 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
795 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
796 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
797 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
798 void statfs_scale_blocks(struct statfs *sf, long max_size);
799 struct vfsconf *vfs_byname(const char *);
800 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
801 void vfs_mount_destroy(struct mount *);
802 void vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
803 void vfs_freeopts(struct vfsoptlist *opts);
804 void vfs_deleteopt(struct vfsoptlist *opts, const char *name);
805 int vfs_buildopts(struct uio *auio, struct vfsoptlist **options);
806 int vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val);
807 int vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
808 int vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
809 char *vfs_getopts(struct vfsoptlist *, const char *, int *error);
810 int vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
811 int vfs_filteropt(struct vfsoptlist *, const char **legal);
812 void vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...);
813 int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
814 int vfs_setopt(struct vfsoptlist *opts, const char *name, void *value,
816 int vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value,
818 int vfs_setopts(struct vfsoptlist *opts, const char *name,
820 int vfs_setpublicfs /* set publicly exported fs */
821 (struct mount *, struct netexport *, struct export_args *);
822 void vfs_msync(struct mount *, int);
823 int vfs_busy(struct mount *, int);
824 int vfs_export /* process mount export info */
825 (struct mount *, struct export_args *);
826 int vfs_allocate_syncvnode(struct mount *);
827 int vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions);
828 void vfs_getnewfsid(struct mount *);
829 struct cdev *vfs_getrootfsid(struct mount *);
830 struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */
831 struct mount *vfs_busyfs(fsid_t *);
832 int vfs_modevent(module_t, int, void *);
833 void vfs_mount_error(struct mount *, const char *, ...);
834 void vfs_mountroot(void); /* mount our root filesystem */
835 void vfs_mountedfrom(struct mount *, const char *from);
836 void vfs_oexport_conv(const struct oexport_args *oexp,
837 struct export_args *exp);
838 void vfs_ref(struct mount *);
839 void vfs_rel(struct mount *);
840 struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
842 int vfs_suser(struct mount *, struct thread *);
843 void vfs_unbusy(struct mount *);
844 void vfs_unmountall(void);
845 extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */
846 extern struct mtx mountlist_mtx;
847 extern struct nfs_public nfs_pub;
850 * Declarations for these vfs default operations are located in
851 * kern/vfs_default.c, they should be used instead of making "dummy"
852 * functions or casting entries in the VFS op table to "enopnotsupp()".
854 vfs_root_t vfs_stdroot;
855 vfs_quotactl_t vfs_stdquotactl;
856 vfs_statfs_t vfs_stdstatfs;
857 vfs_sync_t vfs_stdsync;
858 vfs_sync_t vfs_stdnosync;
859 vfs_vget_t vfs_stdvget;
860 vfs_fhtovp_t vfs_stdfhtovp;
861 vfs_checkexp_t vfs_stdcheckexp;
862 vfs_init_t vfs_stdinit;
863 vfs_uninit_t vfs_stduninit;
864 vfs_extattrctl_t vfs_stdextattrctl;
865 vfs_sysctl_t vfs_stdsysctl;
869 #include <sys/cdefs.h>
874 int fhopen(const struct fhandle *, int);
875 int fhstat(const struct fhandle *, struct stat *);
876 int fhstatfs(const struct fhandle *, struct statfs *);
877 int fstatfs(int, struct statfs *);
878 int getfh(const char *, fhandle_t *);
879 int getfsstat(struct statfs *, long, int);
880 int getmntinfo(struct statfs **, int);
881 int lgetfh(const char *, fhandle_t *);
882 int mount(const char *, const char *, int, void *);
883 int nmount(struct iovec *, unsigned int, int);
884 int statfs(const char *, struct statfs *);
885 int unmount(const char *, int);
887 /* C library stuff */
888 int getvfsbyname(const char *, struct xvfsconf *);
893 #endif /* !_SYS_MOUNT_H_ */