2 * Copyright (c) 1989, 1991, 1993
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6 * modification, are permitted provided that the following conditions
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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98 /* XXX getfsstat.2 is out of date with write and read counter changes here.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.
151 * v - vnode freelist mutex
153 * Unmarked fields are considered stable as long as a ref is held.
157 struct mtx mnt_mtx; /* mount structure interlock */
158 int mnt_gen; /* struct mount generation */
159 #define mnt_startzero mnt_list
160 TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */
161 struct vfsops *mnt_op; /* operations on fs */
162 struct vfsconf *mnt_vfc; /* configuration info */
163 struct vnode *mnt_vnodecovered; /* vnode we mounted on */
164 struct vnode *mnt_syncer; /* syncer vnode */
165 int mnt_ref; /* (i) Reference count */
166 struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */
167 int mnt_nvnodelistsize; /* (i) # of vnodes */
168 struct vnodelst mnt_activevnodelist; /* (v) list of active vnodes */
169 int mnt_activevnodelistsize;/* (v) # of active vnodes */
170 int mnt_writeopcount; /* (i) write syscalls pending */
171 int mnt_kern_flag; /* (i) kernel only flags */
172 uint64_t mnt_flag; /* (i) flags shared with user */
173 struct vfsoptlist *mnt_opt; /* current mount options */
174 struct vfsoptlist *mnt_optnew; /* new options passed to fs */
175 int mnt_maxsymlinklen; /* max size of short symlink */
176 struct statfs mnt_stat; /* cache of filesystem stats */
177 struct ucred *mnt_cred; /* credentials of mounter */
178 void * mnt_data; /* private data */
179 time_t mnt_time; /* last time written*/
180 int mnt_iosize_max; /* max size for clusters, etc */
181 struct netexport *mnt_export; /* export list */
182 struct label *mnt_label; /* MAC label for the fs */
183 u_int mnt_hashseed; /* Random seed for vfs_hash */
184 int mnt_lockref; /* (i) Lock reference count */
185 int mnt_secondary_writes; /* (i) # of secondary writes */
186 int mnt_secondary_accwrites;/* (i) secondary wr. starts */
187 struct thread *mnt_susp_owner; /* (i) thread owning suspension */
188 #define mnt_endzero mnt_gjprovider
189 char *mnt_gjprovider; /* gjournal provider name */
190 struct lock mnt_explock; /* vfs_export walkers lock */
191 TAILQ_ENTRY(mount) mnt_upper_link; /* (m) we in the all uppers */
192 TAILQ_HEAD(, mount) mnt_uppers; /* (m) upper mounts over us*/
196 * Definitions for MNT_VNODE_FOREACH_ALL.
198 struct vnode *__mnt_vnode_next_all(struct vnode **mvp, struct mount *mp);
199 struct vnode *__mnt_vnode_first_all(struct vnode **mvp, struct mount *mp);
200 void __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp);
202 #define MNT_VNODE_FOREACH_ALL(vp, mp, mvp) \
203 for (vp = __mnt_vnode_first_all(&(mvp), (mp)); \
204 (vp) != NULL; vp = __mnt_vnode_next_all(&(mvp), (mp)))
206 #define MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp) \
209 __mnt_vnode_markerfree_all(&(mvp), (mp)); \
210 /* MNT_IUNLOCK(mp); -- done in above function */ \
211 mtx_assert(MNT_MTX(mp), MA_NOTOWNED); \
215 * Definitions for MNT_VNODE_FOREACH_ACTIVE.
217 struct vnode *__mnt_vnode_next_active(struct vnode **mvp, struct mount *mp);
218 struct vnode *__mnt_vnode_first_active(struct vnode **mvp, struct mount *mp);
219 void __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *);
221 #define MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) \
222 for (vp = __mnt_vnode_first_active(&(mvp), (mp)); \
223 (vp) != NULL; vp = __mnt_vnode_next_active(&(mvp), (mp)))
225 #define MNT_VNODE_FOREACH_ACTIVE_ABORT(mp, mvp) \
228 __mnt_vnode_markerfree_active(&(mvp), (mp)); \
229 /* MNT_IUNLOCK(mp); -- done in above function */ \
230 mtx_assert(MNT_MTX(mp), MA_NOTOWNED); \
234 * Definitions for MNT_VNODE_FOREACH.
236 * This interface has been deprecated in favor of MNT_VNODE_FOREACH_ALL.
238 struct vnode *__mnt_vnode_next(struct vnode **mvp, struct mount *mp);
239 struct vnode *__mnt_vnode_first(struct vnode **mvp, struct mount *mp);
240 void __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp);
242 #define MNT_VNODE_FOREACH(vp, mp, mvp) \
243 for (vp = __mnt_vnode_first(&(mvp), (mp)); \
244 (vp) != NULL; vp = __mnt_vnode_next(&(mvp), (mp)))
246 #define MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp) \
247 __mnt_vnode_markerfree(&(mvp), (mp))
249 #define MNT_VNODE_FOREACH_ABORT(mp, mvp) \
252 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); \
256 #define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx)
257 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
258 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
259 #define MNT_MTX(mp) (&(mp)->mnt_mtx)
260 #define MNT_REF(mp) (mp)->mnt_ref++
261 #define MNT_REL(mp) do { \
262 KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref")); \
264 if ((mp)->mnt_ref == 0) \
271 * User specifiable flags, stored in mnt_flag.
273 #define MNT_RDONLY 0x0000000000000001ULL /* read only filesystem */
274 #define MNT_SYNCHRONOUS 0x0000000000000002ULL /* fs written synchronously */
275 #define MNT_NOEXEC 0x0000000000000004ULL /* can't exec from filesystem */
276 #define MNT_NOSUID 0x0000000000000008ULL /* don't honor setuid fs bits */
277 #define MNT_NFS4ACLS 0x0000000000000010ULL /* enable NFS version 4 ACLs */
278 #define MNT_UNION 0x0000000000000020ULL /* union with underlying fs */
279 #define MNT_ASYNC 0x0000000000000040ULL /* fs written asynchronously */
280 #define MNT_SUIDDIR 0x0000000000100000ULL /* special SUID dir handling */
281 #define MNT_SOFTDEP 0x0000000000200000ULL /* using soft updates */
282 #define MNT_NOSYMFOLLOW 0x0000000000400000ULL /* do not follow symlinks */
283 #define MNT_GJOURNAL 0x0000000002000000ULL /* GEOM journal support enabled */
284 #define MNT_MULTILABEL 0x0000000004000000ULL /* MAC support for objects */
285 #define MNT_ACLS 0x0000000008000000ULL /* ACL support enabled */
286 #define MNT_NOATIME 0x0000000010000000ULL /* dont update file access time */
287 #define MNT_NOCLUSTERR 0x0000000040000000ULL /* disable cluster read */
288 #define MNT_NOCLUSTERW 0x0000000080000000ULL /* disable cluster write */
289 #define MNT_SUJ 0x0000000100000000ULL /* using journaled soft updates */
292 * NFS export related mount flags.
294 #define MNT_EXRDONLY 0x0000000000000080ULL /* exported read only */
295 #define MNT_EXPORTED 0x0000000000000100ULL /* filesystem is exported */
296 #define MNT_DEFEXPORTED 0x0000000000000200ULL /* exported to the world */
297 #define MNT_EXPORTANON 0x0000000000000400ULL /* anon uid mapping for all */
298 #define MNT_EXKERB 0x0000000000000800ULL /* exported with Kerberos */
299 #define MNT_EXPUBLIC 0x0000000020000000ULL /* public export (WebNFS) */
302 * Flags set by internal operations,
303 * but visible to the user.
304 * XXX some of these are not quite right.. (I've never seen the root flag set)
306 #define MNT_LOCAL 0x0000000000001000ULL /* filesystem is stored locally */
307 #define MNT_QUOTA 0x0000000000002000ULL /* quotas are enabled on fs */
308 #define MNT_ROOTFS 0x0000000000004000ULL /* identifies the root fs */
309 #define MNT_USER 0x0000000000008000ULL /* mounted by a user */
310 #define MNT_IGNORE 0x0000000000800000ULL /* do not show entry in df */
313 * Mask of flags that are visible to statfs().
314 * XXX I think that this could now become (~(MNT_CMDFLAGS))
315 * but the 'mount' program may need changing to handle this.
317 #define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \
318 MNT_NOSUID | MNT_UNION | MNT_SUJ | \
319 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
320 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \
321 MNT_LOCAL | MNT_USER | MNT_QUOTA | \
322 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \
323 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \
324 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \
325 MNT_GJOURNAL | MNT_MULTILABEL | MNT_ACLS | \
328 /* Mask of flags that can be updated. */
329 #define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \
330 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \
332 MNT_NOSYMFOLLOW | MNT_IGNORE | \
333 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \
334 MNT_ACLS | MNT_USER | MNT_NFS4ACLS)
337 * External filesystem command modifier flags.
338 * Unmount can use the MNT_FORCE flag.
339 * XXX: These are not STATES and really should be somewhere else.
340 * XXX: MNT_BYFSID collides with MNT_ACLS, but because MNT_ACLS is only used for
341 * mount(2) and MNT_BYFSID is only used for unmount(2) it's harmless.
343 #define MNT_UPDATE 0x0000000000010000ULL /* not real mount, just update */
344 #define MNT_DELEXPORT 0x0000000000020000ULL /* delete export host lists */
345 #define MNT_RELOAD 0x0000000000040000ULL /* reload filesystem data */
346 #define MNT_FORCE 0x0000000000080000ULL /* force unmount or readonly */
347 #define MNT_SNAPSHOT 0x0000000001000000ULL /* snapshot the filesystem */
348 #define MNT_BYFSID 0x0000000008000000ULL /* specify filesystem by ID. */
349 #define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \
350 MNT_FORCE | MNT_SNAPSHOT | MNT_BYFSID)
352 * Internal filesystem control flags stored in mnt_kern_flag.
354 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
355 * past the mount point. This keeps the subtree stable during mounts
358 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
359 * dounmount() is still waiting to lock the mountpoint. This allows
360 * the filesystem to cancel operations that might otherwise deadlock
361 * with the unmount attempt (used by NFS).
363 * MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated
364 * to allow for failed unmount attempt to restore the syncer vnode for
367 #define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
368 #define MNTK_ASYNC 0x00000002 /* filtered async flag */
369 #define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */
370 #define MNTK_NOINSMNTQ 0x00000008 /* insmntque is not allowed */
371 #define MNTK_DRAINING 0x00000010 /* lock draining is happening */
372 #define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */
373 #define MNTK_EXTENDED_SHARED 0x00000040 /* Allow shared locking for more ops */
374 #define MNTK_SHARED_WRITES 0x00000080 /* Allow shared locking for writes */
375 #define MNTK_NO_IOPF 0x00000100 /* Disallow page faults during reads
376 and writes. Filesystem shall properly
377 handle i/o state on EFAULT. */
378 #define MNTK_VGONE_UPPER 0x00000200
379 #define MNTK_VGONE_WAITER 0x00000400
380 #define MNTK_LOOKUP_EXCL_DOTDOT 0x00000800
381 #define MNTK_MARKER 0x00001000
382 #define MNTK_NOASYNC 0x00800000 /* disable async */
383 #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
384 #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
385 #define MNTK_SUSPEND 0x08000000 /* request write suspension */
386 #define MNTK_SUSPEND2 0x04000000 /* block secondary writes */
387 #define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */
388 #define MNTK_MPSAFE 0x20000000 /* Filesystem is MPSAFE. */
389 #define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */
390 #define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */
392 #define MNT_SHARED_WRITES(mp) (((mp) != NULL) && \
393 ((mp)->mnt_kern_flag & MNTK_SHARED_WRITES))
396 * Sysctl CTL_VFS definitions.
398 * Second level identifier specifies which filesystem. Second level
399 * identifier VFS_VFSCONF returns information about all filesystems.
400 * Second level identifier VFS_GENERIC is non-terminal.
402 #define VFS_VFSCONF 0 /* get configured filesystems */
403 #define VFS_GENERIC 0 /* generic filesystem information */
405 * Third level identifiers for VFS_GENERIC are given below; third
406 * level identifiers for specific filesystems are given in their
407 * mount specific header files.
409 #define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */
410 #define VFS_CONF 2 /* struct: vfsconf for filesystem given
414 * Flags for various system call interfaces.
416 * waitfor flags to vfs_sync() and getfsstat()
418 #define MNT_WAIT 1 /* synchronously wait for I/O to complete */
419 #define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
420 #define MNT_LAZY 3 /* push data not written by filesystem syncer */
421 #define MNT_SUSPEND 4 /* Suspend file system after sync */
424 * Generic file handle
427 fsid_t fh_fsid; /* Filesystem id of mount point */
428 struct fid fh_fid; /* Filesys specific id */
430 typedef struct fhandle fhandle_t;
433 * Old export arguments without security flavor list
435 struct oexport_args {
436 int ex_flags; /* export related flags */
437 uid_t ex_root; /* mapping for root uid */
438 struct xucred ex_anon; /* mapping for anonymous user */
439 struct sockaddr *ex_addr; /* net address to which exported */
440 u_char ex_addrlen; /* and the net address length */
441 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
442 u_char ex_masklen; /* and the smask length */
443 char *ex_indexfile; /* index file for WebNFS URLs */
447 * Export arguments for local filesystem mount calls.
449 #define MAXSECFLAVORS 5
451 int ex_flags; /* export related flags */
452 uid_t ex_root; /* mapping for root uid */
453 struct xucred ex_anon; /* mapping for anonymous user */
454 struct sockaddr *ex_addr; /* net address to which exported */
455 u_char ex_addrlen; /* and the net address length */
456 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
457 u_char ex_masklen; /* and the smask length */
458 char *ex_indexfile; /* index file for WebNFS URLs */
459 int ex_numsecflavors; /* security flavor count */
460 int ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
464 * Structure holding information for a publicly exported filesystem
465 * (WebNFS). Currently the specs allow just for one such filesystem.
468 int np_valid; /* Do we hold valid information */
469 fhandle_t np_handle; /* Filehandle for pub fs (internal) */
470 struct mount *np_mount; /* Mountpoint of exported fs */
471 char *np_index; /* Index file */
475 * Filesystem configuration information. One of these exists for each
476 * type of filesystem supported by the kernel. These are searched at
477 * mount time to identify the requested filesystem.
479 * XXX: Never change the first two arguments!
482 u_int vfc_version; /* ABI version number */
483 char vfc_name[MFSNAMELEN]; /* filesystem type name */
484 struct vfsops *vfc_vfsops; /* filesystem operations vector */
485 int vfc_typenum; /* historic filesystem type number */
486 int vfc_refcount; /* number mounted of this type */
487 int vfc_flags; /* permanent flags */
488 struct vfsoptdecl *vfc_opts; /* mount options */
489 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */
492 /* Userland version of the struct vfsconf. */
494 struct vfsops *vfc_vfsops; /* filesystem operations vector */
495 char vfc_name[MFSNAMELEN]; /* filesystem type name */
496 int vfc_typenum; /* historic filesystem type number */
497 int vfc_refcount; /* number mounted of this type */
498 int vfc_flags; /* permanent flags */
499 struct vfsconf *vfc_next; /* next in list */
513 * NB: these flags refer to IMPLEMENTATION properties, not properties of
514 * any actual mounts; i.e., it does not make sense to change the flags.
516 #define VFCF_STATIC 0x00010000 /* statically compiled into kernel */
517 #define VFCF_NETWORK 0x00020000 /* may get data over the network */
518 #define VFCF_READONLY 0x00040000 /* writes are not implemented */
519 #define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */
520 #define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */
521 #define VFCF_UNICODE 0x00200000 /* stores file names as Unicode */
522 #define VFCF_JAIL 0x00400000 /* can be mounted from within a jail */
523 #define VFCF_DELEGADMIN 0x00800000 /* supports delegated administration */
525 typedef uint32_t fsctlop_t;
528 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */
529 fsid_t vc_fsid; /* fsid to operate on */
530 char vc_fstypename[MFSNAMELEN];
531 /* type of fs 'nfs' or '*' */
532 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */
533 void *vc_ptr; /* pointer to data structure */
534 size_t vc_len; /* sizeof said structure */
535 u_int32_t vc_spare[12]; /* spare (must be zero) */
538 /* vfsidctl API version. */
539 #define VFS_CTL_VERS1 0x01
542 * New style VFS sysctls, do not reuse/conflict with the namespace for
544 * All "global" sysctl ops have the 33rd bit set:
546 * Private sysctl ops should have the 33rd bit unset.
548 #define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */
549 #define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */
550 #define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */
554 u_int32_t vq_spare[31];
558 #define VQ_NOTRESP 0x0001 /* server down */
559 #define VQ_NEEDAUTH 0x0002 /* server bad auth */
560 #define VQ_LOWDISK 0x0004 /* we're low on space */
561 #define VQ_MOUNT 0x0008 /* new filesystem arrived */
562 #define VQ_UNMOUNT 0x0010 /* filesystem has left */
563 #define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */
564 #define VQ_ASSIST 0x0040 /* filesystem needs assistance from external
566 #define VQ_NOTRESPLOCK 0x0080 /* server lockd down */
567 #define VQ_FLAG0100 0x0100 /* placeholder */
568 #define VQ_FLAG0200 0x0200 /* placeholder */
569 #define VQ_FLAG0400 0x0400 /* placeholder */
570 #define VQ_FLAG0800 0x0800 /* placeholder */
571 #define VQ_FLAG1000 0x1000 /* placeholder */
572 #define VQ_FLAG2000 0x2000 /* placeholder */
573 #define VQ_FLAG4000 0x4000 /* placeholder */
574 #define VQ_FLAG8000 0x8000 /* placeholder */
577 /* Point a sysctl request at a vfsidctl's data. */
578 #define VCTLTOREQ(vc, req) \
580 (req)->newptr = (vc)->vc_ptr; \
581 (req)->newlen = (vc)->vc_len; \
592 * vfs_busy specific flags and mask.
594 #define MBF_NOWAIT 0x01
595 #define MBF_MNTLSTLOCK 0x02
596 #define MBF_MASK (MBF_NOWAIT | MBF_MNTLSTLOCK)
598 #ifdef MALLOC_DECLARE
599 MALLOC_DECLARE(M_MOUNT);
601 extern int maxvfsconf; /* highest defined filesystem type */
602 extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */
604 TAILQ_HEAD(vfsconfhead, vfsconf);
605 extern struct vfsconfhead vfsconf;
608 * Operations supported on mounted filesystem.
615 typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags);
616 typedef int vfs_unmount_t(struct mount *mp, int mntflags);
617 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);
618 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg);
619 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp);
620 typedef int vfs_sync_t(struct mount *mp, int waitfor);
621 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
623 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp,
624 int flags, struct vnode **vpp);
625 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
626 int *extflagsp, struct ucred **credanonp,
627 int *numsecflavors, int **secflavors);
628 typedef int vfs_init_t(struct vfsconf *);
629 typedef int vfs_uninit_t(struct vfsconf *);
630 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
631 struct vnode *filename_vp, int attrnamespace,
632 const char *attrname);
633 typedef int vfs_mount_t(struct mount *mp);
634 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
635 struct sysctl_req *req);
636 typedef void vfs_susp_clean_t(struct mount *mp);
637 typedef void vfs_reclaim_lowervp_t(struct mount *mp, struct vnode *lowervp);
640 vfs_mount_t *vfs_mount;
641 vfs_cmount_t *vfs_cmount;
642 vfs_unmount_t *vfs_unmount;
643 vfs_root_t *vfs_root;
644 vfs_quotactl_t *vfs_quotactl;
645 vfs_statfs_t *vfs_statfs;
646 vfs_sync_t *vfs_sync;
647 vfs_vget_t *vfs_vget;
648 vfs_fhtovp_t *vfs_fhtovp;
649 vfs_checkexp_t *vfs_checkexp;
650 vfs_init_t *vfs_init;
651 vfs_uninit_t *vfs_uninit;
652 vfs_extattrctl_t *vfs_extattrctl;
653 vfs_sysctl_t *vfs_sysctl;
654 vfs_susp_clean_t *vfs_susp_clean;
655 vfs_reclaim_lowervp_t *vfs_reclaim_lowervp;
658 vfs_statfs_t __vfs_statfs;
660 #define VFS_MOUNT(MP) (*(MP)->mnt_op->vfs_mount)(MP)
661 #define VFS_UNMOUNT(MP, FORCE) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE)
662 #define VFS_ROOT(MP, FLAGS, VPP) \
663 (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP)
664 #define VFS_QUOTACTL(MP, C, U, A) \
665 (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A)
666 #define VFS_STATFS(MP, SBP) __vfs_statfs((MP), (SBP))
667 #define VFS_SYNC(MP, WAIT) (*(MP)->mnt_op->vfs_sync)(MP, WAIT)
668 #define VFS_VGET(MP, INO, FLAGS, VPP) \
669 (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP)
670 #define VFS_FHTOVP(MP, FIDP, FLAGS, VPP) \
671 (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, FLAGS, VPP)
672 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) \
673 (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC, SEC)
674 #define VFS_EXTATTRCTL(MP, C, FN, NS, N) \
675 (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N)
676 #define VFS_SYSCTL(MP, OP, REQ) \
677 (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ)
678 #define VFS_SUSP_CLEAN(MP) \
679 ({if (*(MP)->mnt_op->vfs_susp_clean != NULL) \
680 (*(MP)->mnt_op->vfs_susp_clean)(MP); })
681 #define VFS_RECLAIM_LOWERVP(MP, VP) \
682 ({if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) \
683 (*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP)); })
685 #define VFS_NEEDSGIANT_(MP) \
686 ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0)
688 #define VFS_NEEDSGIANT(MP) __extension__ \
692 VFS_NEEDSGIANT_(_mp); \
695 #define VFS_LOCK_GIANT(MP) __extension__ \
700 if (VFS_NEEDSGIANT_(_mp)) { \
707 #define VFS_UNLOCK_GIANT(locked) do \
710 mtx_unlock(&Giant); \
712 #define VFS_ASSERT_GIANT(MP) do \
716 if (VFS_NEEDSGIANT_(_mp)) \
717 mtx_assert(&Giant, MA_OWNED); \
720 #define VFS_KNOTE_LOCKED(vp, hint) do \
722 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
723 VN_KNOTE((vp), (hint), KNF_LISTLOCKED); \
726 #define VFS_KNOTE_UNLOCKED(vp, hint) do \
728 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \
729 VN_KNOTE((vp), (hint), 0); \
732 #include <sys/module.h>
737 #define VFS_VERSION_00 0x19660120
738 #define VFS_VERSION VFS_VERSION_00
740 #define VFS_SET(vfsops, fsname, flags) \
741 static struct vfsconf fsname ## _vfsconf = { \
742 .vfc_version = VFS_VERSION, \
743 .vfc_name = #fsname, \
744 .vfc_vfsops = &vfsops, \
746 .vfc_flags = flags, \
748 static moduledata_t fsname ## _mod = { \
751 & fsname ## _vfsconf \
753 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
755 extern char *mountrootfsname;
758 * exported vnode operations
761 int dounmount(struct mount *, int, struct thread *);
763 int kernel_mount(struct mntarg *ma, uint64_t flags);
764 int kernel_vmount(int flags, ...);
765 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
766 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
767 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
768 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
769 void statfs_scale_blocks(struct statfs *sf, long max_size);
770 struct vfsconf *vfs_byname(const char *);
771 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
772 void vfs_mount_destroy(struct mount *);
773 void vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
774 void vfs_freeopts(struct vfsoptlist *opts);
775 void vfs_deleteopt(struct vfsoptlist *opts, const char *name);
776 int vfs_buildopts(struct uio *auio, struct vfsoptlist **options);
777 int vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
779 int vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
780 int vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
781 int vfs_getopt_size(struct vfsoptlist *opts, const char *name,
783 char *vfs_getopts(struct vfsoptlist *, const char *, int *error);
784 int vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
785 int vfs_filteropt(struct vfsoptlist *, const char **legal);
786 void vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...);
787 int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
788 int vfs_setopt(struct vfsoptlist *opts, const char *name, void *value,
790 int vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value,
792 int vfs_setopts(struct vfsoptlist *opts, const char *name,
794 int vfs_setpublicfs /* set publicly exported fs */
795 (struct mount *, struct netexport *, struct export_args *);
796 void vfs_msync(struct mount *, int);
797 int vfs_busy(struct mount *, int);
798 int vfs_export /* process mount export info */
799 (struct mount *, struct export_args *);
800 void vfs_allocate_syncvnode(struct mount *);
801 void vfs_deallocate_syncvnode(struct mount *);
802 int vfs_donmount(struct thread *td, uint64_t fsflags,
803 struct uio *fsoptions);
804 void vfs_getnewfsid(struct mount *);
805 struct cdev *vfs_getrootfsid(struct mount *);
806 struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */
807 struct mount *vfs_busyfs(fsid_t *);
808 int vfs_modevent(module_t, int, void *);
809 void vfs_mount_error(struct mount *, const char *, ...);
810 void vfs_mountroot(void); /* mount our root filesystem */
811 void vfs_mountedfrom(struct mount *, const char *from);
812 void vfs_oexport_conv(const struct oexport_args *oexp,
813 struct export_args *exp);
814 void vfs_ref(struct mount *);
815 void vfs_rel(struct mount *);
816 struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
818 int vfs_suser(struct mount *, struct thread *);
819 void vfs_unbusy(struct mount *);
820 void vfs_unmountall(void);
821 extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */
822 extern struct mtx mountlist_mtx;
823 extern struct nfs_public nfs_pub;
826 * Declarations for these vfs default operations are located in
827 * kern/vfs_default.c, they should be used instead of making "dummy"
828 * functions or casting entries in the VFS op table to "enopnotsupp()".
830 vfs_root_t vfs_stdroot;
831 vfs_quotactl_t vfs_stdquotactl;
832 vfs_statfs_t vfs_stdstatfs;
833 vfs_sync_t vfs_stdsync;
834 vfs_sync_t vfs_stdnosync;
835 vfs_vget_t vfs_stdvget;
836 vfs_fhtovp_t vfs_stdfhtovp;
837 vfs_checkexp_t vfs_stdcheckexp;
838 vfs_init_t vfs_stdinit;
839 vfs_uninit_t vfs_stduninit;
840 vfs_extattrctl_t vfs_stdextattrctl;
841 vfs_sysctl_t vfs_stdsysctl;
845 #include <sys/cdefs.h>
850 int fhopen(const struct fhandle *, int);
851 int fhstat(const struct fhandle *, struct stat *);
852 int fhstatfs(const struct fhandle *, struct statfs *);
853 int fstatfs(int, struct statfs *);
854 int getfh(const char *, fhandle_t *);
855 int getfsstat(struct statfs *, long, int);
856 int getmntinfo(struct statfs **, int);
857 int lgetfh(const char *, fhandle_t *);
858 int mount(const char *, const char *, int, void *);
859 int nmount(struct iovec *, unsigned int, int);
860 int statfs(const char *, struct statfs *);
861 int unmount(const char *, int);
863 /* C library stuff */
864 int getvfsbyname(const char *, struct xvfsconf *);
869 #endif /* !_SYS_MOUNT_H_ */