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31 * @(#)mount.h 8.21 (Berkeley) 5/20/95
37 #include <sys/ucred.h>
38 #include <sys/queue.h>
40 #include <sys/types.h>
42 #include <sys/lockmgr.h>
43 #include <sys/tslog.h>
44 #include <sys/_mutex.h>
49 * NOTE: When changing statfs structure, mount structure, MNT_* flags or
50 * MNTK_* flags also update DDB show mount command in vfs_subr.c.
53 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
55 #define fsidcmp(a, b) memcmp((a), (b), sizeof(fsid_t))
59 * These are unique per filesystem on a single machine.
61 * Note that the offset of fid_data is 4 bytes, so care must be taken to avoid
62 * undefined behavior accessing unaligned fields within an embedded struct.
67 u_short fid_len; /* length of data in bytes */
68 u_short fid_data0; /* force longword alignment */
69 char fid_data[MAXFIDSZ]; /* data (variable length) */
73 * filesystem statistics
75 #define MFSNAMELEN 16 /* length of type name including null */
76 #define MNAMELEN 1024 /* size of on/from name bufs */
77 #define STATFS_VERSION 0x20140518 /* current version number */
79 uint32_t f_version; /* structure version number */
80 uint32_t f_type; /* type of filesystem */
81 uint64_t f_flags; /* copy of mount exported flags */
82 uint64_t f_bsize; /* filesystem fragment size */
83 uint64_t f_iosize; /* optimal transfer block size */
84 uint64_t f_blocks; /* total data blocks in filesystem */
85 uint64_t f_bfree; /* free blocks in filesystem */
86 int64_t f_bavail; /* free blocks avail to non-superuser */
87 uint64_t f_files; /* total file nodes in filesystem */
88 int64_t f_ffree; /* free nodes avail to non-superuser */
89 uint64_t f_syncwrites; /* count of sync writes since mount */
90 uint64_t f_asyncwrites; /* count of async writes since mount */
91 uint64_t f_syncreads; /* count of sync reads since mount */
92 uint64_t f_asyncreads; /* count of async reads since mount */
93 uint32_t f_nvnodelistsize; /* # of vnodes */
94 uint32_t f_spare0; /* unused spare */
95 uint64_t f_spare[9]; /* unused spare */
96 uint32_t f_namemax; /* maximum filename length */
97 uid_t f_owner; /* user that mounted the filesystem */
98 fsid_t f_fsid; /* filesystem id */
99 char f_charspare[80]; /* spare string space */
100 char f_fstypename[MFSNAMELEN]; /* filesystem type name */
101 char f_mntfromname[MNAMELEN]; /* mounted filesystem */
102 char f_mntonname[MNAMELEN]; /* directory on which mounted */
105 #if defined(_WANT_FREEBSD11_STATFS) || defined(_KERNEL)
106 #define FREEBSD11_STATFS_VERSION 0x20030518 /* current version number */
107 struct freebsd11_statfs {
108 uint32_t f_version; /* structure version number */
109 uint32_t f_type; /* type of filesystem */
110 uint64_t f_flags; /* copy of mount exported flags */
111 uint64_t f_bsize; /* filesystem fragment size */
112 uint64_t f_iosize; /* optimal transfer block size */
113 uint64_t f_blocks; /* total data blocks in filesystem */
114 uint64_t f_bfree; /* free blocks in filesystem */
115 int64_t f_bavail; /* free blocks avail to non-superuser */
116 uint64_t f_files; /* total file nodes in filesystem */
117 int64_t f_ffree; /* free nodes avail to non-superuser */
118 uint64_t f_syncwrites; /* count of sync writes since mount */
119 uint64_t f_asyncwrites; /* count of async writes since mount */
120 uint64_t f_syncreads; /* count of sync reads since mount */
121 uint64_t f_asyncreads; /* count of async reads since mount */
122 uint64_t f_spare[10]; /* unused spare */
123 uint32_t f_namemax; /* maximum filename length */
124 uid_t f_owner; /* user that mounted the filesystem */
125 fsid_t f_fsid; /* filesystem id */
126 char f_charspare[80]; /* spare string space */
127 char f_fstypename[16]; /* filesystem type name */
128 char f_mntfromname[88]; /* mounted filesystem */
129 char f_mntonname[88]; /* directory on which mounted */
131 #endif /* _WANT_FREEBSD11_STATFS || _KERNEL */
134 #define OMFSNAMELEN 16 /* length of fs type name, including null */
135 #define OMNAMELEN (88 - 2 * sizeof(long)) /* size of on/from name bufs */
137 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
138 /* XXX statfs.2 is out of date with read counter changes here. */
140 long f_spare2; /* placeholder */
141 long f_bsize; /* fundamental filesystem block size */
142 long f_iosize; /* optimal transfer block size */
143 long f_blocks; /* total data blocks in filesystem */
144 long f_bfree; /* free blocks in fs */
145 long f_bavail; /* free blocks avail to non-superuser */
146 long f_files; /* total file nodes in filesystem */
147 long f_ffree; /* free file nodes in fs */
148 fsid_t f_fsid; /* filesystem id */
149 uid_t f_owner; /* user that mounted the filesystem */
150 int f_type; /* type of filesystem */
151 int f_flags; /* copy of mount exported flags */
152 long f_syncwrites; /* count of sync writes since mount */
153 long f_asyncwrites; /* count of async writes since mount */
154 char f_fstypename[OMFSNAMELEN]; /* fs type name */
155 char f_mntonname[OMNAMELEN]; /* directory on which mounted */
156 long f_syncreads; /* count of sync reads since mount */
157 long f_asyncreads; /* count of async reads since mount */
158 short f_spares1; /* unused spare */
159 char f_mntfromname[OMNAMELEN];/* mounted filesystem */
160 short f_spares2; /* unused spare */
162 * XXX on machines where longs are aligned to 8-byte boundaries, there
163 * is an unnamed int32_t here. This spare was after the apparent end
164 * of the struct until we bit off the read counters from f_mntonname.
166 long f_spare[2]; /* unused spare */
170 #if defined(_WANT_MOUNT) || defined(_KERNEL)
171 TAILQ_HEAD(vnodelst, vnode);
173 /* Mount options list */
174 TAILQ_HEAD(vfsoptlist, vfsopt);
176 TAILQ_ENTRY(vfsopt) link;
185 int mntp_thread_in_ops;
188 int mntp_writeopcount;
191 _Static_assert(sizeof(struct mount_pcpu) == 16,
192 "the struct is allocated from pcpu 16 zone");
195 * Structure for tracking a stacked filesystem mounted above another
196 * filesystem. This is expected to be stored in the upper FS' per-mount data.
199 * i - lower mount interlock
200 * c - constant from node initialization
202 struct mount_upper_node {
203 struct mount *mp; /* (c) mount object for upper FS */
204 TAILQ_ENTRY(mount_upper_node) mnt_upper_link; /* (i) position in uppers list */
208 * Structure per mounted filesystem. Each mounted filesystem has an
209 * array of operations and an instance record. The filesystems are
210 * put on a doubly linked list.
216 * v - vnode freelist mutex
217 * d - deferred unmount list mutex
220 * Unmarked fields are considered stable as long as a ref is held.
224 int mnt_vfs_ops; /* (i) pending vfs ops */
225 int mnt_kern_flag; /* (i) kernel only flags */
226 uint64_t mnt_flag; /* (i) flags shared with user */
227 struct mount_pcpu *mnt_pcpu; /* per-CPU data */
228 struct vnode *mnt_rootvnode;
229 struct vnode *mnt_vnodecovered; /* vnode we mounted on */
230 struct vfsops *mnt_op; /* operations on fs */
231 struct vfsconf *mnt_vfc; /* configuration info */
232 struct mtx __aligned(CACHE_LINE_SIZE) mnt_mtx; /* mount structure interlock */
233 int mnt_gen; /* struct mount generation */
234 #define mnt_startzero mnt_list
235 TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */
236 struct vnode *mnt_syncer; /* syncer vnode */
237 int mnt_ref; /* (i) Reference count */
238 struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */
239 int mnt_nvnodelistsize; /* (i) # of vnodes */
240 int mnt_writeopcount; /* (i) write syscalls pending */
241 struct vfsoptlist *mnt_opt; /* current mount options */
242 struct vfsoptlist *mnt_optnew; /* new options passed to fs */
243 struct statfs mnt_stat; /* cache of filesystem stats */
244 struct ucred *mnt_cred; /* credentials of mounter */
245 void * mnt_data; /* private data */
246 time_t mnt_time; /* last time written*/
247 int mnt_iosize_max; /* max size for clusters, etc */
248 struct netexport *mnt_export; /* (e) export list */
249 struct label *mnt_label; /* MAC label for the fs */
250 u_int mnt_hashseed; /* Random seed for vfs_hash */
251 int mnt_lockref; /* (i) Lock reference count */
252 int mnt_secondary_writes; /* (i) # of secondary writes */
253 int mnt_secondary_accwrites;/* (i) secondary wr. starts */
254 struct thread *mnt_susp_owner; /* (i) thread owning suspension */
255 struct ucred *mnt_exjail; /* (i) jail which did exports */
256 #define mnt_endzero mnt_gjprovider
257 char *mnt_gjprovider; /* gjournal provider name */
258 struct mtx mnt_listmtx;
259 struct vnodelst mnt_lazyvnodelist; /* (l) list of lazy vnodes */
260 int mnt_lazyvnodelistsize; /* (l) # of lazy vnodes */
261 int mnt_upper_pending; /* (i) # of pending ops on mnt_uppers */
262 struct lock mnt_explock; /* vfs_export walkers lock */
263 TAILQ_HEAD(, mount_upper_node) mnt_uppers; /* (i) upper mounts over us */
264 TAILQ_HEAD(, mount_upper_node) mnt_notify; /* (i) upper mounts for notification */
265 STAILQ_ENTRY(mount) mnt_taskqueue_link; /* (d) our place in deferred unmount list */
266 uint64_t mnt_taskqueue_flags; /* (d) unmount flags passed from taskqueue */
267 unsigned int mnt_unmount_retries; /* (d) # of failed deferred unmount attempts */
269 #endif /* _WANT_MOUNT || _KERNEL */
273 * Definitions for MNT_VNODE_FOREACH_ALL.
275 struct vnode *__mnt_vnode_next_all(struct vnode **mvp, struct mount *mp);
276 struct vnode *__mnt_vnode_first_all(struct vnode **mvp, struct mount *mp);
277 void __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp);
279 #define MNT_VNODE_FOREACH_ALL(vp, mp, mvp) \
280 for (vp = __mnt_vnode_first_all(&(mvp), (mp)); \
281 (vp) != NULL; vp = __mnt_vnode_next_all(&(mvp), (mp)))
283 #define MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp) \
286 __mnt_vnode_markerfree_all(&(mvp), (mp)); \
287 /* MNT_IUNLOCK(mp); -- done in above function */ \
288 mtx_assert(MNT_MTX(mp), MA_NOTOWNED); \
292 * Definitions for MNT_VNODE_FOREACH_LAZY.
294 typedef int mnt_lazy_cb_t(struct vnode *, void *);
295 struct vnode *__mnt_vnode_next_lazy(struct vnode **mvp, struct mount *mp,
296 mnt_lazy_cb_t *cb, void *cbarg);
297 struct vnode *__mnt_vnode_first_lazy(struct vnode **mvp, struct mount *mp,
298 mnt_lazy_cb_t *cb, void *cbarg);
299 void __mnt_vnode_markerfree_lazy(struct vnode **mvp, struct mount *mp);
301 #define MNT_VNODE_FOREACH_LAZY(vp, mp, mvp, cb, cbarg) \
302 for (vp = __mnt_vnode_first_lazy(&(mvp), (mp), (cb), (cbarg)); \
304 vp = __mnt_vnode_next_lazy(&(mvp), (mp), (cb), (cbarg)))
306 #define MNT_VNODE_FOREACH_LAZY_ABORT(mp, mvp) \
307 __mnt_vnode_markerfree_lazy(&(mvp), (mp))
309 #define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx)
310 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
311 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
312 #define MNT_MTX(mp) (&(mp)->mnt_mtx)
314 #define MNT_REF(mp) do { \
315 mtx_assert(MNT_MTX(mp), MA_OWNED); \
318 #define MNT_REL(mp) do { \
319 mtx_assert(MNT_MTX(mp), MA_OWNED); \
321 if ((mp)->mnt_vfs_ops && (mp)->mnt_ref < 0) \
322 vfs_dump_mount_counters(mp); \
323 if ((mp)->mnt_ref == 0 && (mp)->mnt_vfs_ops) \
329 #if defined(_WANT_MNTOPTNAMES) || defined(_KERNEL)
334 #define MNTOPT_NAMES \
335 { MNT_ASYNC, "asynchronous" }, \
336 { MNT_EXPORTED, "NFS exported" }, \
337 { MNT_LOCAL, "local" }, \
338 { MNT_NOATIME, "noatime" }, \
339 { MNT_NOEXEC, "noexec" }, \
340 { MNT_NOSUID, "nosuid" }, \
341 { MNT_NOSYMFOLLOW, "nosymfollow" }, \
342 { MNT_QUOTA, "with quotas" }, \
343 { MNT_RDONLY, "read-only" }, \
344 { MNT_SYNCHRONOUS, "synchronous" }, \
345 { MNT_UNION, "union" }, \
346 { MNT_NOCLUSTERR, "noclusterr" }, \
347 { MNT_NOCLUSTERW, "noclusterw" }, \
348 { MNT_SUIDDIR, "suiddir" }, \
349 { MNT_SOFTDEP, "soft-updates" }, \
350 { MNT_SUJ, "journaled soft-updates" }, \
351 { MNT_MULTILABEL, "multilabel" }, \
352 { MNT_ACLS, "acls" }, \
353 { MNT_NFS4ACLS, "nfsv4acls" }, \
354 { MNT_GJOURNAL, "gjournal" }, \
355 { MNT_AUTOMOUNTED, "automounted" }, \
356 { MNT_VERIFIED, "verified" }, \
357 { MNT_UNTRUSTED, "untrusted" }, \
358 { MNT_NOCOVER, "nocover" }, \
359 { MNT_EMPTYDIR, "emptydir" }, \
360 { MNT_UPDATE, "update" }, \
361 { MNT_DELEXPORT, "delexport" }, \
362 { MNT_RELOAD, "reload" }, \
363 { MNT_FORCE, "force" }, \
364 { MNT_SNAPSHOT, "snapshot" }, \
369 * User specifiable flags, stored in mnt_flag.
371 #define MNT_RDONLY 0x0000000000000001ULL /* read only filesystem */
372 #define MNT_SYNCHRONOUS 0x0000000000000002ULL /* fs written synchronously */
373 #define MNT_NOEXEC 0x0000000000000004ULL /* can't exec from filesystem */
374 #define MNT_NOSUID 0x0000000000000008ULL /* don't honor setuid fs bits */
375 #define MNT_NFS4ACLS 0x0000000000000010ULL /* enable NFS version 4 ACLs */
376 #define MNT_UNION 0x0000000000000020ULL /* union with underlying fs */
377 #define MNT_ASYNC 0x0000000000000040ULL /* fs written asynchronously */
378 #define MNT_SUIDDIR 0x0000000000100000ULL /* special SUID dir handling */
379 #define MNT_SOFTDEP 0x0000000000200000ULL /* using soft updates */
380 #define MNT_NOSYMFOLLOW 0x0000000000400000ULL /* do not follow symlinks */
381 #define MNT_GJOURNAL 0x0000000002000000ULL /* GEOM journal support enabled */
382 #define MNT_MULTILABEL 0x0000000004000000ULL /* MAC support for objects */
383 #define MNT_ACLS 0x0000000008000000ULL /* ACL support enabled */
384 #define MNT_NOATIME 0x0000000010000000ULL /* dont update file access time */
385 #define MNT_NOCLUSTERR 0x0000000040000000ULL /* disable cluster read */
386 #define MNT_NOCLUSTERW 0x0000000080000000ULL /* disable cluster write */
387 #define MNT_SUJ 0x0000000100000000ULL /* using journaled soft updates */
388 #define MNT_AUTOMOUNTED 0x0000000200000000ULL /* mounted by automountd(8) */
389 #define MNT_UNTRUSTED 0x0000000800000000ULL /* filesys metadata untrusted */
392 * NFS export related mount flags.
394 #define MNT_EXRDONLY 0x0000000000000080ULL /* exported read only */
395 #define MNT_EXPORTED 0x0000000000000100ULL /* filesystem is exported */
396 #define MNT_DEFEXPORTED 0x0000000000000200ULL /* exported to the world */
397 #define MNT_EXPORTANON 0x0000000000000400ULL /* anon uid mapping for all */
398 #define MNT_EXKERB 0x0000000000000800ULL /* exported with Kerberos */
399 #define MNT_EXPUBLIC 0x0000000020000000ULL /* public export (WebNFS) */
400 #define MNT_EXTLS 0x0000004000000000ULL /* require TLS */
401 #define MNT_EXTLSCERT 0x0000008000000000ULL /* require TLS with client cert */
402 #define MNT_EXTLSCERTUSER 0x0000010000000000ULL /* require TLS with user cert */
405 * Flags set by internal operations, but visible to the user.
407 #define MNT_LOCAL 0x0000000000001000ULL /* filesystem is stored locally */
408 #define MNT_QUOTA 0x0000000000002000ULL /* quotas are enabled on fs */
409 #define MNT_ROOTFS 0x0000000000004000ULL /* identifies the root fs */
410 #define MNT_USER 0x0000000000008000ULL /* mounted by a user */
411 #define MNT_IGNORE 0x0000000000800000ULL /* do not show entry in df */
412 #define MNT_VERIFIED 0x0000000400000000ULL /* filesystem is verified */
415 * Mask of flags that are visible to statfs().
416 * XXX I think that this could now become (~(MNT_CMDFLAGS))
417 * but the 'mount' program may need changing to handle this.
419 #define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \
420 MNT_NOSUID | MNT_UNION | MNT_SUJ | \
421 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \
422 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \
423 MNT_LOCAL | MNT_USER | MNT_QUOTA | \
424 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \
425 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \
426 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \
427 MNT_GJOURNAL | MNT_MULTILABEL | MNT_ACLS | \
428 MNT_NFS4ACLS | MNT_AUTOMOUNTED | MNT_VERIFIED | \
431 /* Mask of flags that can be updated. */
432 #define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \
433 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \
435 MNT_NOSYMFOLLOW | MNT_IGNORE | \
436 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \
437 MNT_ACLS | MNT_USER | MNT_NFS4ACLS | \
438 MNT_AUTOMOUNTED | MNT_UNTRUSTED)
441 * External filesystem command modifier flags.
442 * Unmount can use the MNT_FORCE flag.
443 * XXX: These are not STATES and really should be somewhere else.
444 * XXX: MNT_BYFSID and MNT_NONBUSY collide with MNT_ACLS and MNT_MULTILABEL,
445 * but because MNT_ACLS and MNT_MULTILABEL are only used for mount(2),
446 * and MNT_BYFSID and MNT_NONBUSY are only used for unmount(2),
449 #define MNT_UPDATE 0x0000000000010000ULL /* not real mount, just update */
450 #define MNT_DELEXPORT 0x0000000000020000ULL /* delete export host lists */
451 #define MNT_RELOAD 0x0000000000040000ULL /* reload filesystem data */
452 #define MNT_FORCE 0x0000000000080000ULL /* force unmount or readonly */
453 #define MNT_SNAPSHOT 0x0000000001000000ULL /* snapshot the filesystem */
454 #define MNT_NONBUSY 0x0000000004000000ULL /* check vnode use counts. */
455 #define MNT_BYFSID 0x0000000008000000ULL /* specify filesystem by ID. */
456 #define MNT_NOCOVER 0x0000001000000000ULL /* Do not cover a mount point */
457 #define MNT_EMPTYDIR 0x0000002000000000ULL /* Only mount on empty dir */
458 #define MNT_RECURSE 0x0000100000000000ULL /* recursively unmount uppers */
459 #define MNT_DEFERRED 0x0000200000000000ULL /* unmount in async context */
460 #define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \
461 MNT_FORCE | MNT_SNAPSHOT | MNT_NONBUSY | \
462 MNT_BYFSID | MNT_NOCOVER | MNT_EMPTYDIR | \
463 MNT_RECURSE | MNT_DEFERRED)
466 * Internal filesystem control flags stored in mnt_kern_flag.
468 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot
469 * proceed past the mount point. This keeps the subtree stable during
470 * mounts and unmounts. When non-forced unmount flushes all vnodes
471 * from the mp queue, the MNTK_UNMOUNT flag prevents insmntque() from
472 * queueing new vnodes.
474 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
475 * dounmount() is still waiting to lock the mountpoint. This allows
476 * the filesystem to cancel operations that might otherwise deadlock
477 * with the unmount attempt (used by NFS).
479 #define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
480 #define MNTK_ASYNC 0x00000002 /* filtered async flag */
481 #define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */
482 #define MNTK_NOMSYNC 0x00000008 /* don't do msync */
483 #define MNTK_DRAINING 0x00000010 /* lock draining is happening */
484 #define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */
485 #define MNTK_EXTENDED_SHARED 0x00000040 /* Allow shared locking for more ops */
486 #define MNTK_SHARED_WRITES 0x00000080 /* Allow shared locking for writes */
487 #define MNTK_NO_IOPF 0x00000100 /* Disallow page faults during reads
488 and writes. Filesystem shall properly
489 handle i/o state on EFAULT. */
490 #define MNTK_RECURSE 0x00000200 /* pending recursive unmount */
491 #define MNTK_UPPER_WAITER 0x00000400 /* waiting to drain MNTK_UPPER_PENDING */
492 /* UNUSED 0x00000800 */
493 #define MNTK_UNLOCKED_INSMNTQUE 0x00001000 /* fs does not lock the vnode for insmntque */
494 #define MNTK_UNMAPPED_BUFS 0x00002000
495 #define MNTK_USES_BCACHE 0x00004000 /* FS uses the buffer cache. */
496 /* UNUSED 0x00008000 */
497 #define MNTK_VMSETSIZE_BUG 0x00010000
498 #define MNTK_UNIONFS 0x00020000 /* A hack for F_ISUNIONSTACK */
499 #define MNTK_FPLOOKUP 0x00040000 /* fast path lookup is supported */
500 #define MNTK_SUSPEND_ALL 0x00080000 /* Suspended by all-fs suspension */
501 #define MNTK_TASKQUEUE_WAITER 0x00100000 /* Waiting on unmount taskqueue */
502 /* UNUSED 0x00200000 */
503 /* UNUSED 0x00400000 */
504 #define MNTK_NOASYNC 0x00800000 /* disable async */
505 #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
506 #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
507 #define MNTK_SUSPEND 0x08000000 /* request write suspension */
508 #define MNTK_SUSPEND2 0x04000000 /* block secondary writes */
509 #define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */
510 #define MNTK_NULL_NOCACHE 0x20000000 /* auto disable cache for nullfs
511 mounts over this fs */
512 #define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */
513 /* UNUSED 0x80000000 */
517 MNT_SHARED_WRITES(struct mount *mp)
520 return (mp != NULL && (mp->mnt_kern_flag & MNTK_SHARED_WRITES) != 0);
524 MNT_EXTENDED_SHARED(struct mount *mp)
527 return (mp != NULL && (mp->mnt_kern_flag & MNTK_EXTENDED_SHARED) != 0);
532 * Sysctl CTL_VFS definitions.
534 * Second level identifier specifies which filesystem. Second level
535 * identifier VFS_VFSCONF returns information about all filesystems.
536 * Second level identifier VFS_GENERIC is non-terminal.
538 #define VFS_VFSCONF 0 /* get configured filesystems */
539 #define VFS_GENERIC 0 /* generic filesystem information */
541 * Third level identifiers for VFS_GENERIC are given below; third
542 * level identifiers for specific filesystems are given in their
543 * mount specific header files.
545 #define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */
546 #define VFS_CONF 2 /* struct: vfsconf for filesystem given
550 * Flags for various system call interfaces.
552 * waitfor flags to vfs_sync() and getfsstat()
554 #define MNT_WAIT 1 /* synchronously wait for I/O to complete */
555 #define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */
556 #define MNT_LAZY 3 /* push data not written by filesystem syncer */
557 #define MNT_SUSPEND 4 /* Suspend file system after sync */
560 * Generic file handle
563 fsid_t fh_fsid; /* Filesystem id of mount point */
564 struct fid fh_fid; /* Filesys specific id */
566 typedef struct fhandle fhandle_t;
569 * Old export arguments without security flavor list
571 struct oexport_args {
572 int ex_flags; /* export related flags */
573 uid_t ex_root; /* mapping for root uid */
574 struct xucred ex_anon; /* mapping for anonymous user */
575 struct sockaddr *ex_addr; /* net address to which exported */
576 u_char ex_addrlen; /* and the net address length */
577 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
578 u_char ex_masklen; /* and the smask length */
579 char *ex_indexfile; /* index file for WebNFS URLs */
583 * Not quite so old export arguments with 32bit ex_flags and xucred ex_anon.
585 #define MAXSECFLAVORS 5
586 struct o2export_args {
587 int ex_flags; /* export related flags */
588 uid_t ex_root; /* mapping for root uid */
589 struct xucred ex_anon; /* mapping for anonymous user */
590 struct sockaddr *ex_addr; /* net address to which exported */
591 u_char ex_addrlen; /* and the net address length */
592 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
593 u_char ex_masklen; /* and the smask length */
594 char *ex_indexfile; /* index file for WebNFS URLs */
595 int ex_numsecflavors; /* security flavor count */
596 int ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
600 * Export arguments for local filesystem mount calls.
603 uint64_t ex_flags; /* export related flags */
604 uid_t ex_root; /* mapping for root uid */
605 uid_t ex_uid; /* mapping for anonymous user */
608 struct sockaddr *ex_addr; /* net address to which exported */
609 u_char ex_addrlen; /* and the net address length */
610 struct sockaddr *ex_mask; /* mask of valid bits in saddr */
611 u_char ex_masklen; /* and the smask length */
612 char *ex_indexfile; /* index file for WebNFS URLs */
613 int ex_numsecflavors; /* security flavor count */
614 int ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
618 * Structure holding information for a publicly exported filesystem
619 * (WebNFS). Currently the specs allow just for one such filesystem.
622 int np_valid; /* Do we hold valid information */
623 fhandle_t np_handle; /* Filehandle for pub fs (internal) */
624 struct mount *np_mount; /* Mountpoint of exported fs */
625 char *np_index; /* Index file */
629 * Filesystem configuration information. One of these exists for each
630 * type of filesystem supported by the kernel. These are searched at
631 * mount time to identify the requested filesystem.
633 * XXX: Never change the first two arguments!
636 u_int vfc_version; /* ABI version number */
637 char vfc_name[MFSNAMELEN]; /* filesystem type name */
638 struct vfsops *vfc_vfsops; /* filesystem operations vector */
639 struct vfsops *vfc_vfsops_sd; /* ... signal-deferred */
640 int vfc_typenum; /* historic filesystem type number */
641 int vfc_refcount; /* number mounted of this type */
642 int vfc_flags; /* permanent flags */
643 int vfc_prison_flag; /* prison allow.mount.* flag */
644 struct vfsoptdecl *vfc_opts; /* mount options */
645 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */
648 /* Userland version of the struct vfsconf. */
650 struct vfsops *vfc_vfsops; /* filesystem operations vector */
651 char vfc_name[MFSNAMELEN]; /* filesystem type name */
652 int vfc_typenum; /* historic filesystem type number */
653 int vfc_refcount; /* number mounted of this type */
654 int vfc_flags; /* permanent flags */
655 struct vfsconf *vfc_next; /* next in list */
669 * NB: these flags refer to IMPLEMENTATION properties, not properties of
670 * any actual mounts; i.e., it does not make sense to change the flags.
672 #define VFCF_STATIC 0x00010000 /* statically compiled into kernel */
673 #define VFCF_NETWORK 0x00020000 /* may get data over the network */
674 #define VFCF_READONLY 0x00040000 /* writes are not implemented */
675 #define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */
676 #define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */
677 #define VFCF_UNICODE 0x00200000 /* stores file names as Unicode */
678 #define VFCF_JAIL 0x00400000 /* can be mounted from within a jail */
679 #define VFCF_DELEGADMIN 0x00800000 /* supports delegated administration */
680 #define VFCF_SBDRY 0x01000000 /* Stop at Boundary: defer stop requests
681 to kernel->user (AST) transition */
682 #define VFCF_FILEMOUNT 0x02000000 /* allow mounting files */
684 typedef uint32_t fsctlop_t;
687 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */
688 fsid_t vc_fsid; /* fsid to operate on */
689 char vc_fstypename[MFSNAMELEN];
690 /* type of fs 'nfs' or '*' */
691 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */
692 void *vc_ptr; /* pointer to data structure */
693 size_t vc_len; /* sizeof said structure */
694 u_int32_t vc_spare[12]; /* spare (must be zero) */
697 /* vfsidctl API version. */
698 #define VFS_CTL_VERS1 0x01
701 * New style VFS sysctls, do not reuse/conflict with the namespace for
703 * All "global" sysctl ops have the 33rd bit set:
705 * Private sysctl ops should have the 33rd bit unset.
707 #define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */
708 #define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */
709 #define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */
713 u_int32_t vq_spare[31];
717 #define VQ_NOTRESP 0x0001 /* server down */
718 #define VQ_NEEDAUTH 0x0002 /* server bad auth */
719 #define VQ_LOWDISK 0x0004 /* we're low on space */
720 #define VQ_MOUNT 0x0008 /* new filesystem arrived */
721 #define VQ_UNMOUNT 0x0010 /* filesystem has left */
722 #define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */
723 #define VQ_ASSIST 0x0040 /* filesystem needs assistance from external
725 #define VQ_NOTRESPLOCK 0x0080 /* server lockd down */
726 #define VQ_FLAG0100 0x0100 /* placeholder */
727 #define VQ_FLAG0200 0x0200 /* placeholder */
728 #define VQ_FLAG0400 0x0400 /* placeholder */
729 #define VQ_FLAG0800 0x0800 /* placeholder */
730 #define VQ_FLAG1000 0x1000 /* placeholder */
731 #define VQ_FLAG2000 0x2000 /* placeholder */
732 #define VQ_FLAG4000 0x4000 /* placeholder */
733 #define VQ_FLAG8000 0x8000 /* placeholder */
736 /* Point a sysctl request at a vfsidctl's data. */
737 #define VCTLTOREQ(vc, req) \
739 (req)->newptr = (vc)->vc_ptr; \
740 (req)->newlen = (vc)->vc_len; \
751 * vfs_busy specific flags and mask.
753 #define MBF_NOWAIT 0x01
754 #define MBF_MNTLSTLOCK 0x02
755 #define MBF_MASK (MBF_NOWAIT | MBF_MNTLSTLOCK)
757 #ifdef MALLOC_DECLARE
758 MALLOC_DECLARE(M_MOUNT);
759 MALLOC_DECLARE(M_STATFS);
761 extern int maxvfsconf; /* highest defined filesystem type */
763 TAILQ_HEAD(vfsconfhead, vfsconf);
764 extern struct vfsconfhead vfsconf;
767 * Operations supported on mounted filesystem.
775 * N.B., vfs_cmount is the ancient vfsop invoked by the old mount(2) syscall.
776 * The new way is vfs_mount.
778 * vfs_cmount implementations typically translate arguments from their
779 * respective old per-FS structures into the key-value list supported by
780 * nmount(2), then use kernel_mount(9) to mimic nmount(2) from kernelspace.
782 * Filesystems with mounters that use nmount(2) do not need to and should not
783 * implement vfs_cmount. Hopefully a future cleanup can remove vfs_cmount and
786 typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags);
787 typedef int vfs_unmount_t(struct mount *mp, int mntflags);
788 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);
789 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg,
791 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp);
792 typedef int vfs_sync_t(struct mount *mp, int waitfor);
793 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
795 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp,
796 int flags, struct vnode **vpp);
797 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
798 uint64_t *extflagsp, struct ucred **credanonp,
799 int *numsecflavors, int *secflavors);
800 typedef int vfs_init_t(struct vfsconf *);
801 typedef int vfs_uninit_t(struct vfsconf *);
802 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
803 struct vnode *filename_vp, int attrnamespace,
804 const char *attrname);
805 typedef int vfs_mount_t(struct mount *mp);
806 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
807 struct sysctl_req *req);
808 typedef void vfs_susp_clean_t(struct mount *mp);
809 typedef void vfs_notify_lowervp_t(struct mount *mp, struct vnode *lowervp);
810 typedef void vfs_purge_t(struct mount *mp);
812 typedef int vfs_report_lockf_t(struct mount *mp, struct sbuf *sb);
815 vfs_mount_t *vfs_mount;
816 vfs_cmount_t *vfs_cmount;
817 vfs_unmount_t *vfs_unmount;
818 vfs_root_t *vfs_root;
819 vfs_root_t *vfs_cachedroot;
820 vfs_quotactl_t *vfs_quotactl;
821 vfs_statfs_t *vfs_statfs;
822 vfs_sync_t *vfs_sync;
823 vfs_vget_t *vfs_vget;
824 vfs_fhtovp_t *vfs_fhtovp;
825 vfs_checkexp_t *vfs_checkexp;
826 vfs_init_t *vfs_init;
827 vfs_uninit_t *vfs_uninit;
828 vfs_extattrctl_t *vfs_extattrctl;
829 vfs_sysctl_t *vfs_sysctl;
830 vfs_susp_clean_t *vfs_susp_clean;
831 vfs_notify_lowervp_t *vfs_reclaim_lowervp;
832 vfs_notify_lowervp_t *vfs_unlink_lowervp;
833 vfs_purge_t *vfs_purge;
834 vfs_report_lockf_t *vfs_report_lockf;
835 vfs_mount_t *vfs_spare[6]; /* spares for ABI compat */
838 vfs_statfs_t __vfs_statfs;
840 #define VFS_MOUNT(MP) ({ \
843 TSRAW(curthread, TS_ENTER, "VFS_MOUNT", (MP)->mnt_vfc->vfc_name);\
844 _rc = (*(MP)->mnt_op->vfs_mount)(MP); \
845 TSRAW(curthread, TS_EXIT, "VFS_MOUNT", (MP)->mnt_vfc->vfc_name);\
848 #define VFS_UNMOUNT(MP, FORCE) ({ \
851 _rc = (*(MP)->mnt_op->vfs_unmount)(MP, FORCE); \
854 #define VFS_ROOT(MP, FLAGS, VPP) ({ \
857 _rc = (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP); \
860 #define VFS_CACHEDROOT(MP, FLAGS, VPP) ({ \
863 _rc = (*(MP)->mnt_op->vfs_cachedroot)(MP, FLAGS, VPP); \
866 #define VFS_QUOTACTL(MP, C, U, A, MP_BUSY) ({ \
869 _rc = (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, MP_BUSY); \
872 #define VFS_STATFS(MP, SBP) ({ \
875 _rc = __vfs_statfs((MP), (SBP)); \
878 #define VFS_SYNC(MP, WAIT) ({ \
881 _rc = (*(MP)->mnt_op->vfs_sync)(MP, WAIT); \
884 #define VFS_VGET(MP, INO, FLAGS, VPP) ({ \
887 _rc = (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP); \
890 #define VFS_FHTOVP(MP, FIDP, FLAGS, VPP) ({ \
893 _rc = (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, FLAGS, VPP); \
896 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) ({ \
899 _rc = (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC,\
903 #define VFS_EXTATTRCTL(MP, C, FN, NS, N) ({ \
906 _rc = (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N); \
909 #define VFS_SYSCTL(MP, OP, REQ) ({ \
912 _rc = (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ); \
915 #define VFS_SUSP_CLEAN(MP) do { \
916 if (*(MP)->mnt_op->vfs_susp_clean != NULL) { \
917 (*(MP)->mnt_op->vfs_susp_clean)(MP); \
921 #define VFS_RECLAIM_LOWERVP(MP, VP) do { \
922 if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) { \
923 (*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP)); \
927 #define VFS_UNLINK_LOWERVP(MP, VP) do { \
928 if (*(MP)->mnt_op->vfs_unlink_lowervp != NULL) { \
929 (*(MP)->mnt_op->vfs_unlink_lowervp)((MP), (VP)); \
933 #define VFS_PURGE(MP) do { \
934 if (*(MP)->mnt_op->vfs_purge != NULL) { \
935 (*(MP)->mnt_op->vfs_purge)(MP); \
939 #define VFS_KNOTE_LOCKED(vp, hint) do \
941 VN_KNOTE((vp), (hint), KNF_LISTLOCKED); \
944 #define VFS_KNOTE_UNLOCKED(vp, hint) do \
946 VN_KNOTE((vp), (hint), 0); \
949 #include <sys/module.h>
954 #define VFS_VERSION_00 0x19660120
955 #define VFS_VERSION_01 0x20121030
956 #define VFS_VERSION_02 0x20180504
957 #define VFS_VERSION VFS_VERSION_02
959 #define VFS_SET(vfsops, fsname, flags) \
960 static struct vfsconf fsname ## _vfsconf = { \
961 .vfc_version = VFS_VERSION, \
962 .vfc_name = #fsname, \
963 .vfc_vfsops = &vfsops, \
965 .vfc_flags = flags, \
967 static moduledata_t fsname ## _mod = { \
970 & fsname ## _vfsconf \
972 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
974 enum vfs_notify_upper_type {
975 VFS_NOTIFY_UPPER_RECLAIM,
976 VFS_NOTIFY_UPPER_UNLINK,
980 * exported vnode operations
983 int dounmount(struct mount *, uint64_t, struct thread *);
985 int kernel_mount(struct mntarg *ma, uint64_t flags);
986 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
987 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
988 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
989 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
990 void statfs_scale_blocks(struct statfs *sf, long max_size);
991 struct vfsconf *vfs_byname(const char *);
992 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
993 void vfs_mount_destroy(struct mount *);
994 void vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
995 void vfs_freeopts(struct vfsoptlist *opts);
996 void vfs_deleteopt(struct vfsoptlist *opts, const char *name);
997 int vfs_buildopts(struct uio *auio, struct vfsoptlist **options);
998 int vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
1000 int vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
1001 int vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
1002 int vfs_getopt_size(struct vfsoptlist *opts, const char *name,
1004 char *vfs_getopts(struct vfsoptlist *, const char *, int *error);
1005 int vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
1006 int vfs_filteropt(struct vfsoptlist *, const char **legal);
1007 void vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...);
1008 int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
1009 int vfs_setopt(struct vfsoptlist *opts, const char *name, void *value,
1011 int vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value,
1013 int vfs_setopts(struct vfsoptlist *opts, const char *name,
1015 int vfs_setpublicfs /* set publicly exported fs */
1016 (struct mount *, struct netexport *, struct export_args *);
1017 void vfs_periodic(struct mount *, int);
1018 int vfs_busy(struct mount *, int);
1019 void vfs_exjail_delete(struct prison *);
1020 int vfs_export /* process mount export info */
1021 (struct mount *, struct export_args *, bool);
1022 void vfs_free_addrlist(struct netexport *);
1023 void vfs_allocate_syncvnode(struct mount *);
1024 void vfs_deallocate_syncvnode(struct mount *);
1025 int vfs_donmount(struct thread *td, uint64_t fsflags,
1026 struct uio *fsoptions);
1027 void vfs_getnewfsid(struct mount *);
1028 struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */
1029 struct mount *vfs_busyfs(fsid_t *);
1030 int vfs_modevent(module_t, int, void *);
1031 void vfs_mount_error(struct mount *, const char *, ...);
1032 void vfs_mountroot(void); /* mount our root filesystem */
1033 void vfs_mountedfrom(struct mount *, const char *from);
1034 void vfs_notify_upper(struct vnode *, enum vfs_notify_upper_type);
1035 struct mount *vfs_ref_from_vp(struct vnode *);
1036 void vfs_ref(struct mount *);
1037 void vfs_rel(struct mount *);
1038 struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
1040 int vfs_suser(struct mount *, struct thread *);
1041 void vfs_unbusy(struct mount *);
1042 void vfs_unmountall(void);
1043 struct mount *vfs_register_upper_from_vp(struct vnode *,
1044 struct mount *ump, struct mount_upper_node *);
1045 void vfs_register_for_notification(struct mount *, struct mount *,
1046 struct mount_upper_node *);
1047 void vfs_unregister_for_notification(struct mount *,
1048 struct mount_upper_node *);
1049 void vfs_unregister_upper(struct mount *, struct mount_upper_node *);
1050 int vfs_remount_ro(struct mount *mp);
1051 int vfs_report_lockf(struct mount *mp, struct sbuf *sb);
1053 extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */
1054 extern struct mtx_padalign mountlist_mtx;
1055 extern struct nfs_public nfs_pub;
1056 extern struct sx vfsconf_sx;
1057 #define vfsconf_lock() sx_xlock(&vfsconf_sx)
1058 #define vfsconf_unlock() sx_xunlock(&vfsconf_sx)
1059 #define vfsconf_slock() sx_slock(&vfsconf_sx)
1060 #define vfsconf_sunlock() sx_sunlock(&vfsconf_sx)
1061 struct vnode *mntfs_allocvp(struct mount *, struct vnode *);
1062 void mntfs_freevp(struct vnode *);
1065 * Declarations for these vfs default operations are located in
1066 * kern/vfs_default.c. They will be automatically used to replace
1067 * null entries in VFS ops tables when registering a new filesystem
1068 * type in the global table.
1070 vfs_root_t vfs_stdroot;
1071 vfs_quotactl_t vfs_stdquotactl;
1072 vfs_statfs_t vfs_stdstatfs;
1073 vfs_sync_t vfs_stdsync;
1074 vfs_sync_t vfs_stdnosync;
1075 vfs_vget_t vfs_stdvget;
1076 vfs_fhtovp_t vfs_stdfhtovp;
1077 vfs_checkexp_t vfs_stdcheckexp;
1078 vfs_init_t vfs_stdinit;
1079 vfs_uninit_t vfs_stduninit;
1080 vfs_extattrctl_t vfs_stdextattrctl;
1081 vfs_sysctl_t vfs_stdsysctl;
1083 void syncer_suspend(void);
1084 void syncer_resume(void);
1086 struct vnode *vfs_cache_root_clear(struct mount *);
1087 void vfs_cache_root_set(struct mount *, struct vnode *);
1089 void vfs_op_barrier_wait(struct mount *);
1090 void vfs_op_enter(struct mount *);
1091 void vfs_op_exit_locked(struct mount *);
1092 void vfs_op_exit(struct mount *);
1095 void vfs_assert_mount_counters(struct mount *);
1096 void vfs_dump_mount_counters(struct mount *);
1098 #define vfs_assert_mount_counters(mp) do { } while (0)
1099 #define vfs_dump_mount_counters(mp) do { } while (0)
1102 enum mount_counter { MNT_COUNT_REF, MNT_COUNT_LOCKREF, MNT_COUNT_WRITEOPCOUNT };
1103 int vfs_mount_fetch_counter(struct mount *, enum mount_counter);
1105 void suspend_all_fs(void);
1106 void resume_all_fs(void);
1109 * Code transitioning mnt_vfs_ops to > 0 issues IPIs until it observes
1110 * all CPUs not executing code enclosed by thread_in_ops_pcpu variable.
1112 * This provides an invariant that by the time the last CPU is observed not
1113 * executing, everyone else entering will see the counter > 0 and exit.
1115 * Note there is no barrier between vfs_ops and the rest of the code in the
1116 * section. It is not necessary as the writer has to wait for everyone to drain
1117 * before making any changes or only make changes safe while the section is
1120 #define vfs_mount_pcpu(mp) zpcpu_get(mp->mnt_pcpu)
1121 #define vfs_mount_pcpu_remote(mp, cpu) zpcpu_get_cpu(mp->mnt_pcpu, cpu)
1123 #define vfs_op_thread_entered(mp) ({ \
1124 MPASS(curthread->td_critnest > 0); \
1125 struct mount_pcpu *_mpcpu = vfs_mount_pcpu(mp); \
1126 _mpcpu->mntp_thread_in_ops == 1; \
1129 #define vfs_op_thread_enter_crit(mp, _mpcpu) ({ \
1130 bool _retval_crit = true; \
1131 MPASS(curthread->td_critnest > 0); \
1132 _mpcpu = vfs_mount_pcpu(mp); \
1133 MPASS(mpcpu->mntp_thread_in_ops == 0); \
1134 _mpcpu->mntp_thread_in_ops = 1; \
1135 atomic_interrupt_fence(); \
1136 if (__predict_false(mp->mnt_vfs_ops > 0)) { \
1137 vfs_op_thread_exit_crit(mp, _mpcpu); \
1138 _retval_crit = false; \
1143 #define vfs_op_thread_enter(mp, _mpcpu) ({ \
1146 _retval = vfs_op_thread_enter_crit(mp, _mpcpu); \
1147 if (__predict_false(!_retval)) \
1152 #define vfs_op_thread_exit_crit(mp, _mpcpu) do { \
1153 MPASS(_mpcpu == vfs_mount_pcpu(mp)); \
1154 MPASS(_mpcpu->mntp_thread_in_ops == 1); \
1155 atomic_interrupt_fence(); \
1156 _mpcpu->mntp_thread_in_ops = 0; \
1159 #define vfs_op_thread_exit(mp, _mpcpu) do { \
1160 vfs_op_thread_exit_crit(mp, _mpcpu); \
1164 #define vfs_mp_count_add_pcpu(_mpcpu, count, val) do { \
1165 MPASS(_mpcpu->mntp_thread_in_ops == 1); \
1166 _mpcpu->mntp_##count += val; \
1169 #define vfs_mp_count_sub_pcpu(_mpcpu, count, val) do { \
1170 MPASS(_mpcpu->mntp_thread_in_ops == 1); \
1171 _mpcpu->mntp_##count -= val; \
1174 #else /* !_KERNEL */
1176 #include <sys/cdefs.h>
1181 int fhlink(struct fhandle *, const char *);
1182 int fhlinkat(struct fhandle *, int, const char *);
1183 int fhopen(const struct fhandle *, int);
1184 int fhreadlink(struct fhandle *, char *, size_t);
1185 int fhstat(const struct fhandle *, struct stat *);
1186 int fhstatfs(const struct fhandle *, struct statfs *);
1187 int fstatfs(int, struct statfs *);
1188 int getfh(const char *, fhandle_t *);
1189 int getfhat(int, char *, struct fhandle *, int);
1190 int getfsstat(struct statfs *, long, int);
1191 int getmntinfo(struct statfs **, int);
1192 int lgetfh(const char *, fhandle_t *);
1193 int mount(const char *, const char *, int, void *);
1194 int nmount(struct iovec *, unsigned int, int);
1195 int statfs(const char *, struct statfs *);
1196 int unmount(const char *, int);
1198 /* C library stuff */
1199 int getvfsbyname(const char *, struct xvfsconf *);
1202 #endif /* _KERNEL */
1204 #endif /* !_SYS_MOUNT_H_ */