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>
46 * NOTE: When changing statfs structure, mount structure, MNT_* flags or
47 * MNTK_* flags also update DDB show mount command in vfs_subr.c.
50 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
54 * These are unique per filesystem on a single machine.
59 u_short fid_len; /* length of data in bytes */
60 u_short fid_data0; /* force longword alignment */
61 char fid_data[MAXFIDSZ]; /* data (variable length) */
65 * filesystem statistics
67 #define MFSNAMELEN 16 /* length of type name including null */
68 #define MNAMELEN 88 /* size of on/from name bufs */
69 #define STATFS_VERSION 0x20030518 /* current version number */
71 uint32_t f_version; /* structure version number */
72 uint32_t f_type; /* type of filesystem */
73 uint64_t f_flags; /* copy of mount exported flags */
74 uint64_t f_bsize; /* filesystem fragment size */
75 uint64_t f_iosize; /* optimal transfer block size */
76 uint64_t f_blocks; /* total data blocks in filesystem */
77 uint64_t f_bfree; /* free blocks in filesystem */
78 int64_t f_bavail; /* free blocks avail to non-superuser */
79 uint64_t f_files; /* total file nodes in filesystem */
80 int64_t f_ffree; /* free nodes avail to non-superuser */
81 uint64_t f_syncwrites; /* count of sync writes since mount */
82 uint64_t f_asyncwrites; /* count of async writes since mount */
83 uint64_t f_syncreads; /* count of sync reads since mount */
84 uint64_t f_asyncreads; /* count of async reads since mount */
85 uint64_t f_spare[10]; /* unused spare */
86 uint32_t f_namemax; /* maximum filename length */
87 uid_t f_owner; /* user that mounted the filesystem */
88 fsid_t f_fsid; /* filesystem id */
89 char f_charspare[80]; /* spare string space */
90 char f_fstypename[MFSNAMELEN]; /* filesystem type name */
91 char f_mntfromname[MNAMELEN]; /* mounted filesystem */
92 char f_mntonname[MNAMELEN]; /* directory on which mounted */
96 #define OMFSNAMELEN 16 /* length of fs type name, including null */
97 #define OMNAMELEN (88 - 2 * sizeof(long)) /* size of on/from name bufs */
99 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
100 /* XXX statfs.2 is out of date with read counter changes here. */
102 long f_spare2; /* placeholder */
103 long f_bsize; /* fundamental filesystem block size */
104 long f_iosize; /* optimal transfer block size */
105 long f_blocks; /* total data blocks in filesystem */
106 long f_bfree; /* free blocks in fs */
107 long f_bavail; /* free blocks avail to non-superuser */
108 long f_files; /* total file nodes in filesystem */
109 long f_ffree; /* free file nodes in fs */
110 fsid_t f_fsid; /* filesystem id */
111 uid_t f_owner; /* user that mounted the filesystem */
112 int f_type; /* type of filesystem */
113 int f_flags; /* copy of mount exported flags */
114 long f_syncwrites; /* count of sync writes since mount */
115 long f_asyncwrites; /* count of async writes since mount */
116 char f_fstypename[OMFSNAMELEN]; /* fs type name */
117 char f_mntonname[OMNAMELEN]; /* directory on which mounted */
118 long f_syncreads; /* count of sync reads since mount */
119 long f_asyncreads; /* count of async reads since mount */
120 short f_spares1; /* unused spare */
121 char f_mntfromname[OMNAMELEN];/* mounted filesystem */
122 short f_spares2; /* unused spare */
124 * XXX on machines where longs are aligned to 8-byte boundaries, there
125 * is an unnamed int32_t here. This spare was after the apparent end
126 * of the struct until we bit off the read counters from f_mntonname.
128 long f_spare[2]; /* unused spare */
131 TAILQ_HEAD(vnodelst, vnode);
133 /* Mount options list */
134 TAILQ_HEAD(vfsoptlist, vfsopt);
136 TAILQ_ENTRY(vfsopt) link;
145 * Structure per mounted filesystem. Each mounted filesystem has an
146 * array of operations and an instance record. The filesystems are
147 * put on a doubly linked list.
152 * v - vnode freelist mutex
154 * Unmarked fields are considered stable as long as a ref is held.
158 struct mtx mnt_mtx; /* mount structure interlock */
159 int mnt_gen; /* struct mount generation */
160 #define mnt_startzero mnt_list
161 TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */
162 struct vfsops *mnt_op; /* operations on fs */
163 struct vfsconf *mnt_vfc; /* configuration info */
164 struct vnode *mnt_vnodecovered; /* vnode we mounted on */
165 struct vnode *mnt_syncer; /* syncer vnode */
166 int mnt_ref; /* (i) Reference count */
167 struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */
168 int mnt_nvnodelistsize; /* (i) # of vnodes */
169 struct vnodelst mnt_activevnodelist; /* (v) list of active vnodes */
170 int mnt_activevnodelistsize;/* (v) # of active vnodes */
171 int mnt_writeopcount; /* (i) write syscalls pending */
172 int mnt_kern_flag; /* (i) kernel only flags */
173 uint64_t mnt_flag; /* (i) flags shared with user */
174 struct vfsoptlist *mnt_opt; /* current mount options */
175 struct vfsoptlist *mnt_optnew; /* new options passed to fs */
176 int mnt_maxsymlinklen; /* max size of short symlink */
177 struct statfs mnt_stat; /* cache of filesystem stats */
178 struct ucred *mnt_cred; /* credentials of mounter */
179 void * mnt_data; /* private data */
180 time_t mnt_time; /* last time written*/
181 int mnt_iosize_max; /* max size for clusters, etc */
182 struct netexport *mnt_export; /* export list */
183 struct label *mnt_label; /* MAC label for the fs */
184 u_int mnt_hashseed; /* Random seed for vfs_hash */
185 int mnt_lockref; /* (i) Lock reference count */
186 int mnt_secondary_writes; /* (i) # of secondary writes */
187 int mnt_secondary_accwrites;/* (i) secondary wr. starts */
188 struct thread *mnt_susp_owner; /* (i) thread owning suspension */
189 #define mnt_endzero mnt_gjprovider
190 char *mnt_gjprovider; /* gjournal provider name */
191 struct lock mnt_explock; /* vfs_export walkers lock */
192 TAILQ_ENTRY(mount) mnt_upper_link; /* (m) we in the all uppers */
193 TAILQ_HEAD(, mount) mnt_uppers; /* (m) upper mounts over us*/
197 * Definitions for MNT_VNODE_FOREACH_ALL.
199 struct vnode *__mnt_vnode_next_all(struct vnode **mvp, struct mount *mp);
200 struct vnode *__mnt_vnode_first_all(struct vnode **mvp, struct mount *mp);
201 void __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp);
203 #define MNT_VNODE_FOREACH_ALL(vp, mp, mvp) \
204 for (vp = __mnt_vnode_first_all(&(mvp), (mp)); \
205 (vp) != NULL; vp = __mnt_vnode_next_all(&(mvp), (mp)))
207 #define MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp) \
210 __mnt_vnode_markerfree_all(&(mvp), (mp)); \
211 /* MNT_IUNLOCK(mp); -- done in above function */ \
212 mtx_assert(MNT_MTX(mp), MA_NOTOWNED); \
216 * Definitions for MNT_VNODE_FOREACH_ACTIVE.
218 struct vnode *__mnt_vnode_next_active(struct vnode **mvp, struct mount *mp);
219 struct vnode *__mnt_vnode_first_active(struct vnode **mvp, struct mount *mp);
220 void __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *);
222 #define MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) \
223 for (vp = __mnt_vnode_first_active(&(mvp), (mp)); \
224 (vp) != NULL; vp = __mnt_vnode_next_active(&(mvp), (mp)))
226 #define MNT_VNODE_FOREACH_ACTIVE_ABORT(mp, mvp) \
227 __mnt_vnode_markerfree_active(&(mvp), (mp))
229 #define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx)
230 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
231 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
232 #define MNT_MTX(mp) (&(mp)->mnt_mtx)
233 #define MNT_REF(mp) (mp)->mnt_ref++
234 #define MNT_REL(mp) do { \
235 KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref")); \
237 if ((mp)->mnt_ref == 0) \
244 * User specifiable flags, stored in mnt_flag.
246 #define MNT_RDONLY 0x0000000000000001ULL /* read only filesystem */
247 #define MNT_SYNCHRONOUS 0x0000000000000002ULL /* fs written synchronously */
248 #define MNT_NOEXEC 0x0000000000000004ULL /* can't exec from filesystem */
249 #define MNT_NOSUID 0x0000000000000008ULL /* don't honor setuid fs bits */
250 #define MNT_NFS4ACLS 0x0000000000000010ULL /* enable NFS version 4 ACLs */
251 #define MNT_UNION 0x0000000000000020ULL /* union with underlying fs */
252 #define MNT_ASYNC 0x0000000000000040ULL /* fs written asynchronously */
253 #define MNT_SUIDDIR 0x0000000000100000ULL /* special SUID dir handling */
254 #define MNT_SOFTDEP 0x0000000000200000ULL /* using soft updates */
255 #define MNT_NOSYMFOLLOW 0x0000000000400000ULL /* do not follow symlinks */
256 #define MNT_GJOURNAL 0x0000000002000000ULL /* GEOM journal support enabled */
257 #define MNT_MULTILABEL 0x0000000004000000ULL /* MAC support for objects */
258 #define MNT_ACLS 0x0000000008000000ULL /* ACL support enabled */
259 #define MNT_NOATIME 0x0000000010000000ULL /* dont update file access time */
260 #define MNT_NOCLUSTERR 0x0000000040000000ULL /* disable cluster read */
261 #define MNT_NOCLUSTERW 0x0000000080000000ULL /* disable cluster write */
262 #define MNT_SUJ 0x0000000100000000ULL /* using journaled soft updates */
263 #define MNT_AUTOMOUNTED 0x0000000200000000ULL /* mounted by automountd(8) */
266 * NFS export related mount flags.
268 #define MNT_EXRDONLY 0x0000000000000080ULL /* exported read only */
269 #define MNT_EXPORTED 0x0000000000000100ULL /* filesystem is exported */
270 #define MNT_DEFEXPORTED 0x0000000000000200ULL /* exported to the world */
271 #define MNT_EXPORTANON 0x0000000000000400ULL /* anon uid mapping for all */
272 #define MNT_EXKERB 0x0000000000000800ULL /* exported with Kerberos */
273 #define MNT_EXPUBLIC 0x0000000020000000ULL /* public export (WebNFS) */
276 * Flags set by internal operations,
277 * but visible to the user.
278 * XXX some of these are not quite right.. (I've never seen the root flag set)
280 #define MNT_LOCAL 0x0000000000001000ULL /* filesystem is stored locally */
281 #define MNT_QUOTA 0x0000000000002000ULL /* quotas are enabled on fs */
282 #define MNT_ROOTFS 0x0000000000004000ULL /* identifies the root fs */
283 #define MNT_USER 0x0000000000008000ULL /* mounted by a user */
284 #define MNT_IGNORE 0x0000000000800000ULL /* do not show entry in df */
287 * Mask of flags that are visible to statfs().
288 * XXX I think that this could now become (~(MNT_CMDFLAGS))
289 * but the 'mount' program may need changing to handle this.
291 #define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \
292 MNT_NOSUID | MNT_UNION | MNT_SUJ | \
293 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
294 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \
295 MNT_LOCAL | MNT_USER | MNT_QUOTA | \
296 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \
297 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \
298 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \
299 MNT_GJOURNAL | MNT_MULTILABEL | MNT_ACLS | \
300 MNT_NFS4ACLS | MNT_AUTOMOUNTED)
302 /* Mask of flags that can be updated. */
303 #define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \
304 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \
306 MNT_NOSYMFOLLOW | MNT_IGNORE | \
307 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \
308 MNT_ACLS | MNT_USER | MNT_NFS4ACLS | \
312 * External filesystem command modifier flags.
313 * Unmount can use the MNT_FORCE flag.
314 * XXX: These are not STATES and really should be somewhere else.
315 * XXX: MNT_BYFSID collides with MNT_ACLS, but because MNT_ACLS is only used for
316 * mount(2) and MNT_BYFSID is only used for unmount(2) it's harmless.
318 #define MNT_UPDATE 0x0000000000010000ULL /* not real mount, just update */
319 #define MNT_DELEXPORT 0x0000000000020000ULL /* delete export host lists */
320 #define MNT_RELOAD 0x0000000000040000ULL /* reload filesystem data */
321 #define MNT_FORCE 0x0000000000080000ULL /* force unmount or readonly */
322 #define MNT_SNAPSHOT 0x0000000001000000ULL /* snapshot the filesystem */
323 #define MNT_BYFSID 0x0000000008000000ULL /* specify filesystem by ID. */
324 #define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \
325 MNT_FORCE | MNT_SNAPSHOT | MNT_BYFSID)
327 * Internal filesystem control flags stored in mnt_kern_flag.
329 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
330 * past the mount point. This keeps the subtree stable during mounts
333 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
334 * dounmount() is still waiting to lock the mountpoint. This allows
335 * the filesystem to cancel operations that might otherwise deadlock
336 * with the unmount attempt (used by NFS).
338 * MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated
339 * to allow for failed unmount attempt to restore the syncer vnode for
342 #define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
343 #define MNTK_ASYNC 0x00000002 /* filtered async flag */
344 #define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */
345 #define MNTK_NOINSMNTQ 0x00000008 /* insmntque is not allowed */
346 #define MNTK_DRAINING 0x00000010 /* lock draining is happening */
347 #define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */
348 #define MNTK_EXTENDED_SHARED 0x00000040 /* Allow shared locking for more ops */
349 #define MNTK_SHARED_WRITES 0x00000080 /* Allow shared locking for writes */
350 #define MNTK_NO_IOPF 0x00000100 /* Disallow page faults during reads
351 and writes. Filesystem shall properly
352 handle i/o state on EFAULT. */
353 #define MNTK_VGONE_UPPER 0x00000200
354 #define MNTK_VGONE_WAITER 0x00000400
355 #define MNTK_LOOKUP_EXCL_DOTDOT 0x00000800
356 #define MNTK_MARKER 0x00001000
357 #define MNTK_UNMAPPED_BUFS 0x00002000
358 #define MNTK_USES_BCACHE 0x00004000 /* FS uses the buffer cache. */
359 #define MNTK_NOASYNC 0x00800000 /* disable async */
360 #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
361 #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
362 #define MNTK_SUSPEND 0x08000000 /* request write suspension */
363 #define MNTK_SUSPEND2 0x04000000 /* block secondary writes */
364 #define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */
365 #define MNTK_UNUSED25 0x20000000 /* --available-- */
366 #define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */
367 #define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */
371 MNT_SHARED_WRITES(struct mount *mp)
374 return (mp != NULL && (mp->mnt_kern_flag & MNTK_SHARED_WRITES) != 0);
378 MNT_EXTENDED_SHARED(struct mount *mp)
381 return (mp != NULL && (mp->mnt_kern_flag & MNTK_EXTENDED_SHARED) != 0);
386 * Sysctl CTL_VFS definitions.
388 * Second level identifier specifies which filesystem. Second level
389 * identifier VFS_VFSCONF returns information about all filesystems.
390 * Second level identifier VFS_GENERIC is non-terminal.
392 #define VFS_VFSCONF 0 /* get configured filesystems */
393 #define VFS_GENERIC 0 /* generic filesystem information */
395 * Third level identifiers for VFS_GENERIC are given below; third
396 * level identifiers for specific filesystems are given in their
397 * mount specific header files.
399 #define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */
400 #define VFS_CONF 2 /* struct: vfsconf for filesystem given
404 * Flags for various system call interfaces.
406 * waitfor flags to vfs_sync() and getfsstat()
408 #define MNT_WAIT 1 /* synchronously wait for I/O to complete */
409 #define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
410 #define MNT_LAZY 3 /* push data not written by filesystem syncer */
411 #define MNT_SUSPEND 4 /* Suspend file system after sync */
414 * Generic file handle
417 fsid_t fh_fsid; /* Filesystem id of mount point */
418 struct fid fh_fid; /* Filesys specific id */
420 typedef struct fhandle fhandle_t;
423 * Old export arguments without security flavor list
425 struct oexport_args {
426 int ex_flags; /* export related flags */
427 uid_t ex_root; /* mapping for root uid */
428 struct xucred ex_anon; /* mapping for anonymous user */
429 struct sockaddr *ex_addr; /* net address to which exported */
430 u_char ex_addrlen; /* and the net address length */
431 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
432 u_char ex_masklen; /* and the smask length */
433 char *ex_indexfile; /* index file for WebNFS URLs */
437 * Export arguments for local filesystem mount calls.
439 #define MAXSECFLAVORS 5
441 int ex_flags; /* export related flags */
442 uid_t ex_root; /* mapping for root uid */
443 struct xucred ex_anon; /* mapping for anonymous user */
444 struct sockaddr *ex_addr; /* net address to which exported */
445 u_char ex_addrlen; /* and the net address length */
446 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
447 u_char ex_masklen; /* and the smask length */
448 char *ex_indexfile; /* index file for WebNFS URLs */
449 int ex_numsecflavors; /* security flavor count */
450 int ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
454 * Structure holding information for a publicly exported filesystem
455 * (WebNFS). Currently the specs allow just for one such filesystem.
458 int np_valid; /* Do we hold valid information */
459 fhandle_t np_handle; /* Filehandle for pub fs (internal) */
460 struct mount *np_mount; /* Mountpoint of exported fs */
461 char *np_index; /* Index file */
465 * Filesystem configuration information. One of these exists for each
466 * type of filesystem supported by the kernel. These are searched at
467 * mount time to identify the requested filesystem.
469 * XXX: Never change the first two arguments!
472 u_int vfc_version; /* ABI version number */
473 char vfc_name[MFSNAMELEN]; /* filesystem type name */
474 struct vfsops *vfc_vfsops; /* filesystem operations vector */
475 int vfc_typenum; /* historic filesystem type number */
476 int vfc_refcount; /* number mounted of this type */
477 int vfc_flags; /* permanent flags */
478 struct vfsoptdecl *vfc_opts; /* mount options */
479 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */
482 /* Userland version of the struct vfsconf. */
484 struct vfsops *vfc_vfsops; /* filesystem operations vector */
485 char vfc_name[MFSNAMELEN]; /* filesystem type name */
486 int vfc_typenum; /* historic filesystem type number */
487 int vfc_refcount; /* number mounted of this type */
488 int vfc_flags; /* permanent flags */
489 struct vfsconf *vfc_next; /* next in list */
503 * NB: these flags refer to IMPLEMENTATION properties, not properties of
504 * any actual mounts; i.e., it does not make sense to change the flags.
506 #define VFCF_STATIC 0x00010000 /* statically compiled into kernel */
507 #define VFCF_NETWORK 0x00020000 /* may get data over the network */
508 #define VFCF_READONLY 0x00040000 /* writes are not implemented */
509 #define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */
510 #define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */
511 #define VFCF_UNICODE 0x00200000 /* stores file names as Unicode */
512 #define VFCF_JAIL 0x00400000 /* can be mounted from within a jail */
513 #define VFCF_DELEGADMIN 0x00800000 /* supports delegated administration */
514 #define VFCF_SBDRY 0x01000000 /* defer stop requests */
516 typedef uint32_t fsctlop_t;
519 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */
520 fsid_t vc_fsid; /* fsid to operate on */
521 char vc_fstypename[MFSNAMELEN];
522 /* type of fs 'nfs' or '*' */
523 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */
524 void *vc_ptr; /* pointer to data structure */
525 size_t vc_len; /* sizeof said structure */
526 u_int32_t vc_spare[12]; /* spare (must be zero) */
529 /* vfsidctl API version. */
530 #define VFS_CTL_VERS1 0x01
533 * New style VFS sysctls, do not reuse/conflict with the namespace for
535 * All "global" sysctl ops have the 33rd bit set:
537 * Private sysctl ops should have the 33rd bit unset.
539 #define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */
540 #define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */
541 #define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */
545 u_int32_t vq_spare[31];
549 #define VQ_NOTRESP 0x0001 /* server down */
550 #define VQ_NEEDAUTH 0x0002 /* server bad auth */
551 #define VQ_LOWDISK 0x0004 /* we're low on space */
552 #define VQ_MOUNT 0x0008 /* new filesystem arrived */
553 #define VQ_UNMOUNT 0x0010 /* filesystem has left */
554 #define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */
555 #define VQ_ASSIST 0x0040 /* filesystem needs assistance from external
557 #define VQ_NOTRESPLOCK 0x0080 /* server lockd down */
558 #define VQ_FLAG0100 0x0100 /* placeholder */
559 #define VQ_FLAG0200 0x0200 /* placeholder */
560 #define VQ_FLAG0400 0x0400 /* placeholder */
561 #define VQ_FLAG0800 0x0800 /* placeholder */
562 #define VQ_FLAG1000 0x1000 /* placeholder */
563 #define VQ_FLAG2000 0x2000 /* placeholder */
564 #define VQ_FLAG4000 0x4000 /* placeholder */
565 #define VQ_FLAG8000 0x8000 /* placeholder */
568 /* Point a sysctl request at a vfsidctl's data. */
569 #define VCTLTOREQ(vc, req) \
571 (req)->newptr = (vc)->vc_ptr; \
572 (req)->newlen = (vc)->vc_len; \
583 * vfs_busy specific flags and mask.
585 #define MBF_NOWAIT 0x01
586 #define MBF_MNTLSTLOCK 0x02
587 #define MBF_MASK (MBF_NOWAIT | MBF_MNTLSTLOCK)
589 #ifdef MALLOC_DECLARE
590 MALLOC_DECLARE(M_MOUNT);
592 extern int maxvfsconf; /* highest defined filesystem type */
593 extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */
595 TAILQ_HEAD(vfsconfhead, vfsconf);
596 extern struct vfsconfhead vfsconf;
599 * Operations supported on mounted filesystem.
606 typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags);
607 typedef int vfs_unmount_t(struct mount *mp, int mntflags);
608 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);
609 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg);
610 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp);
611 typedef int vfs_sync_t(struct mount *mp, int waitfor);
612 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
614 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp,
615 int flags, struct vnode **vpp);
616 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
617 int *extflagsp, struct ucred **credanonp,
618 int *numsecflavors, int **secflavors);
619 typedef int vfs_init_t(struct vfsconf *);
620 typedef int vfs_uninit_t(struct vfsconf *);
621 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
622 struct vnode *filename_vp, int attrnamespace,
623 const char *attrname);
624 typedef int vfs_mount_t(struct mount *mp);
625 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
626 struct sysctl_req *req);
627 typedef void vfs_susp_clean_t(struct mount *mp);
628 typedef void vfs_notify_lowervp_t(struct mount *mp, struct vnode *lowervp);
629 typedef void vfs_purge_t(struct mount *mp);
632 vfs_mount_t *vfs_mount;
633 vfs_cmount_t *vfs_cmount;
634 vfs_unmount_t *vfs_unmount;
635 vfs_root_t *vfs_root;
636 vfs_quotactl_t *vfs_quotactl;
637 vfs_statfs_t *vfs_statfs;
638 vfs_sync_t *vfs_sync;
639 vfs_vget_t *vfs_vget;
640 vfs_fhtovp_t *vfs_fhtovp;
641 vfs_checkexp_t *vfs_checkexp;
642 vfs_init_t *vfs_init;
643 vfs_uninit_t *vfs_uninit;
644 vfs_extattrctl_t *vfs_extattrctl;
645 vfs_sysctl_t *vfs_sysctl;
646 vfs_susp_clean_t *vfs_susp_clean;
647 vfs_notify_lowervp_t *vfs_reclaim_lowervp;
648 vfs_notify_lowervp_t *vfs_unlink_lowervp;
649 vfs_purge_t *vfs_purge;
650 vfs_mount_t *vfs_spare[6]; /* spares for ABI compat */
653 vfs_statfs_t __vfs_statfs;
655 #define VFS_PROLOGUE(MP) do { \
656 struct mount *mp__; \
660 _enable_stops = (mp__ != NULL && \
661 (mp__->mnt_vfc->vfc_flags & VFCF_SBDRY) && sigdeferstop())
663 #define VFS_EPILOGUE(MP) \
668 #define VFS_MOUNT(MP) ({ \
672 _rc = (*(MP)->mnt_op->vfs_mount)(MP); \
676 #define VFS_UNMOUNT(MP, FORCE) ({ \
680 _rc = (*(MP)->mnt_op->vfs_unmount)(MP, FORCE); \
684 #define VFS_ROOT(MP, FLAGS, VPP) ({ \
688 _rc = (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP); \
692 #define VFS_QUOTACTL(MP, C, U, A) ({ \
696 _rc = (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A); \
700 #define VFS_STATFS(MP, SBP) ({ \
704 _rc = __vfs_statfs((MP), (SBP)); \
708 #define VFS_SYNC(MP, WAIT) ({ \
712 _rc = (*(MP)->mnt_op->vfs_sync)(MP, WAIT); \
716 #define VFS_VGET(MP, INO, FLAGS, VPP) ({ \
720 _rc = (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP); \
724 #define VFS_FHTOVP(MP, FIDP, FLAGS, VPP) ({ \
728 _rc = (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, FLAGS, VPP); \
732 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) ({ \
736 _rc = (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC,\
741 #define VFS_EXTATTRCTL(MP, C, FN, NS, N) ({ \
745 _rc = (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N); \
749 #define VFS_SYSCTL(MP, OP, REQ) ({ \
753 _rc = (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ); \
757 #define VFS_SUSP_CLEAN(MP) do { \
758 if (*(MP)->mnt_op->vfs_susp_clean != NULL) { \
760 (*(MP)->mnt_op->vfs_susp_clean)(MP); \
765 #define VFS_RECLAIM_LOWERVP(MP, VP) do { \
766 if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) { \
768 (*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP)); \
773 #define VFS_UNLINK_LOWERVP(MP, VP) do { \
774 if (*(MP)->mnt_op->vfs_unlink_lowervp != NULL) { \
776 (*(MP)->mnt_op->vfs_unlink_lowervp)((MP), (VP)); \
781 #define VFS_PURGE(MP) do { \
782 if (*(MP)->mnt_op->vfs_purge != NULL) { \
784 (*(MP)->mnt_op->vfs_purge)(MP); \
789 #define VFS_KNOTE_LOCKED(vp, hint) do \
791 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
792 VN_KNOTE((vp), (hint), KNF_LISTLOCKED); \
795 #define VFS_KNOTE_UNLOCKED(vp, hint) do \
797 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
798 VN_KNOTE((vp), (hint), 0); \
801 #define VFS_NOTIFY_UPPER_RECLAIM 1
802 #define VFS_NOTIFY_UPPER_UNLINK 2
804 #include <sys/module.h>
809 #define VFS_VERSION_00 0x19660120
810 #define VFS_VERSION_01 0x20121030
811 #define VFS_VERSION VFS_VERSION_01
813 #define VFS_SET(vfsops, fsname, flags) \
814 static struct vfsconf fsname ## _vfsconf = { \
815 .vfc_version = VFS_VERSION, \
816 .vfc_name = #fsname, \
817 .vfc_vfsops = &vfsops, \
819 .vfc_flags = flags, \
821 static moduledata_t fsname ## _mod = { \
824 & fsname ## _vfsconf \
826 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
828 extern char *mountrootfsname;
831 * exported vnode operations
834 int dounmount(struct mount *, int, struct thread *);
836 int kernel_mount(struct mntarg *ma, uint64_t flags);
837 int kernel_vmount(int flags, ...);
838 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
839 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
840 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
841 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
842 void statfs_scale_blocks(struct statfs *sf, long max_size);
843 struct vfsconf *vfs_byname(const char *);
844 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
845 void vfs_mount_destroy(struct mount *);
846 void vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
847 void vfs_freeopts(struct vfsoptlist *opts);
848 void vfs_deleteopt(struct vfsoptlist *opts, const char *name);
849 int vfs_buildopts(struct uio *auio, struct vfsoptlist **options);
850 int vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
852 int vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
853 int vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
854 int vfs_getopt_size(struct vfsoptlist *opts, const char *name,
856 char *vfs_getopts(struct vfsoptlist *, const char *, int *error);
857 int vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
858 int vfs_filteropt(struct vfsoptlist *, const char **legal);
859 void vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...);
860 int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
861 int vfs_setopt(struct vfsoptlist *opts, const char *name, void *value,
863 int vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value,
865 int vfs_setopts(struct vfsoptlist *opts, const char *name,
867 int vfs_setpublicfs /* set publicly exported fs */
868 (struct mount *, struct netexport *, struct export_args *);
869 void vfs_msync(struct mount *, int);
870 int vfs_busy(struct mount *, int);
871 int vfs_export /* process mount export info */
872 (struct mount *, struct export_args *);
873 void vfs_allocate_syncvnode(struct mount *);
874 void vfs_deallocate_syncvnode(struct mount *);
875 int vfs_donmount(struct thread *td, uint64_t fsflags,
876 struct uio *fsoptions);
877 void vfs_getnewfsid(struct mount *);
878 struct cdev *vfs_getrootfsid(struct mount *);
879 struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */
880 struct mount *vfs_busyfs(fsid_t *);
881 int vfs_modevent(module_t, int, void *);
882 void vfs_mount_error(struct mount *, const char *, ...);
883 void vfs_mountroot(void); /* mount our root filesystem */
884 void vfs_mountedfrom(struct mount *, const char *from);
885 void vfs_notify_upper(struct vnode *, int);
886 void vfs_oexport_conv(const struct oexport_args *oexp,
887 struct export_args *exp);
888 void vfs_ref(struct mount *);
889 void vfs_rel(struct mount *);
890 struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
892 int vfs_suser(struct mount *, struct thread *);
893 void vfs_unbusy(struct mount *);
894 void vfs_unmountall(void);
895 extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */
896 extern struct mtx mountlist_mtx;
897 extern struct nfs_public nfs_pub;
898 extern struct sx vfsconf_sx;
899 #define vfsconf_lock() sx_xlock(&vfsconf_sx)
900 #define vfsconf_unlock() sx_xunlock(&vfsconf_sx)
901 #define vfsconf_slock() sx_slock(&vfsconf_sx)
902 #define vfsconf_sunlock() sx_sunlock(&vfsconf_sx)
905 * Declarations for these vfs default operations are located in
906 * kern/vfs_default.c. They will be automatically used to replace
907 * null entries in VFS ops tables when registering a new filesystem
908 * type in the global table.
910 vfs_root_t vfs_stdroot;
911 vfs_quotactl_t vfs_stdquotactl;
912 vfs_statfs_t vfs_stdstatfs;
913 vfs_sync_t vfs_stdsync;
914 vfs_sync_t vfs_stdnosync;
915 vfs_vget_t vfs_stdvget;
916 vfs_fhtovp_t vfs_stdfhtovp;
917 vfs_checkexp_t vfs_stdcheckexp;
918 vfs_init_t vfs_stdinit;
919 vfs_uninit_t vfs_stduninit;
920 vfs_extattrctl_t vfs_stdextattrctl;
921 vfs_sysctl_t vfs_stdsysctl;
923 void syncer_suspend(void);
924 void syncer_resume(void);
928 #include <sys/cdefs.h>
933 int fhopen(const struct fhandle *, int);
934 int fhstat(const struct fhandle *, struct stat *);
935 int fhstatfs(const struct fhandle *, struct statfs *);
936 int fstatfs(int, struct statfs *);
937 int getfh(const char *, fhandle_t *);
938 int getfsstat(struct statfs *, long, int);
939 int getmntinfo(struct statfs **, int);
940 int lgetfh(const char *, fhandle_t *);
941 int mount(const char *, const char *, int, void *);
942 int nmount(struct iovec *, unsigned int, int);
943 int statfs(const char *, struct statfs *);
944 int unmount(const char *, int);
946 /* C library stuff */
947 int getvfsbyname(const char *, struct xvfsconf *);
952 #endif /* !_SYS_MOUNT_H_ */