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1 /*
2 * Copyright (c) 2000-2018 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
29 /*
30 * Copyright (c) 1989, 1991, 1993
31 * The Regents of the University of California. All rights reserved.
32 *
33 * Redistribution and use in source and binary forms, with or without
34 * modification, are permitted provided that the following conditions
35 * are met:
36 * 1. Redistributions of source code must retain the above copyright
37 * notice, this list of conditions and the following disclaimer.
38 * 2. Redistributions in binary form must reproduce the above copyright
39 * notice, this list of conditions and the following disclaimer in the
40 * documentation and/or other materials provided with the distribution.
41 * 3. All advertising materials mentioning features or use of this software
42 * must display the following acknowledgement:
43 * This product includes software developed by the University of
44 * California, Berkeley and its contributors.
45 * 4. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)mount.h 8.21 (Berkeley) 5/20/95
62 */
63 /*
64 * NOTICE: This file was modified by McAfee Research in 2004 to introduce
65 * support for mandatory and extensible security protections. This notice
66 * is included in support of clause 2.2 (b) of the Apple Public License,
67 * Version 2.0.
68 */
69
70 #ifndef _SYS_MOUNT_INTERNAL_H_
71 #define _SYS_MOUNT_INTERNAL_H_
72
73 #include <sys/appleapiopts.h>
74 #ifndef KERNEL
75 #include <sys/ucred.h>
76 #else
77 #include <sys/kernel_types.h>
78 #include <sys/namei.h>
79 #endif
80 #include <sys/queue.h>
81 #include <sys/lock.h>
82 #include <net/radix.h>
83 #include <sys/socket.h> /* XXX for AF_MAX */
84 #include <sys/vfs_context.h> /* XXX for AF_MAX */
85 #include <sys/mount.h>
86 #include <sys/cdefs.h>
87 #include <sys/sysctl.h>
88
89 struct label;
90
91 #if defined(__i386__) || defined(__x86_64__)
92 typedef uint64_t pending_io_t;
93 #define INCR_PENDING_IO(a, b) OSAddAtomic64((int64_t)(a), (int64_t *)&(b));
94 #else
95 typedef uint32_t pending_io_t;
96 #define INCR_PENDING_IO(a, b) OSAddAtomic((int32_t)(a), (int32_t *)&(b));
97 #endif
98
99
100 /*
101 * Structure per mounted file system. Each mounted file system has an
102 * array of operations and an instance record. The file systems are
103 * put on a doubly linked list.
104 */
105 TAILQ_HEAD(vnodelst, vnode);
106
107 struct mount {
108 TAILQ_ENTRY(mount) mnt_list; /* mount list */
109 int32_t mnt_count; /* reference on the mount */
110 lck_mtx_t mnt_mlock; /* mutex that protects mount point */
111 const struct vfsops *mnt_op; /* operations on fs */
112 struct vfstable *mnt_vtable; /* configuration info */
113 struct vnode *mnt_vnodecovered; /* vnode we mounted on */
114 struct vnodelst mnt_vnodelist; /* list of vnodes this mount */
115 struct vnodelst mnt_workerqueue; /* list of vnodes this mount */
116 struct vnodelst mnt_newvnodes; /* list of vnodes this mount */
117 uint32_t mnt_flag; /* flags */
118 uint32_t mnt_kern_flag; /* kernel only flags */
119 uint32_t mnt_compound_ops; /* Available compound operations */
120 uint32_t mnt_lflag; /* mount life cycle flags */
121 uint32_t mnt_maxsymlinklen; /* max size of short symlink */
122 struct vfsstatfs mnt_vfsstat; /* cache of filesystem stats */
123 qaddr_t mnt_data; /* private data */
124 /* Cached values of the IO constraints for the device */
125 uint32_t mnt_maxreadcnt; /* Max. byte count for read */
126 uint32_t mnt_maxwritecnt; /* Max. byte count for write */
127 uint32_t mnt_segreadcnt; /* Max. segment count for read */
128 uint32_t mnt_segwritecnt; /* Max. segment count for write */
129 uint32_t mnt_maxsegreadsize; /* Max. segment read size */
130 uint32_t mnt_maxsegwritesize; /* Max. segment write size */
131 uint32_t mnt_alignmentmask; /* Mask of bits that aren't addressable via DMA */
132 uint32_t mnt_devblocksize; /* the underlying device block size */
133 uint32_t mnt_ioqueue_depth; /* the maxiumum number of commands a device can accept */
134 uint32_t mnt_ioscale; /* scale the various throttles/limits imposed on the amount of I/O in flight */
135 uint32_t mnt_ioflags; /* flags for underlying device */
136 uint32_t mnt_minsaturationbytecount; /* if non-zero, mininum amount of writes (in bytes) needed to max out throughput */
137 pending_io_t mnt_pending_write_size __attribute__((aligned(sizeof(pending_io_t)))); /* byte count of pending writes */
138 pending_io_t mnt_pending_read_size __attribute__((aligned(sizeof(pending_io_t)))); /* byte count of pending reads */
139 struct timeval mnt_last_write_issued_timestamp;
140 struct timeval mnt_last_write_completed_timestamp;
141 int64_t mnt_max_swappin_available;
142
143 lck_rw_t mnt_rwlock; /* mutex readwrite lock */
144 lck_mtx_t mnt_renamelock; /* mutex that serializes renames that change shape of tree */
145 vnode_t mnt_devvp; /* the device mounted on for local file systems */
146 uint32_t mnt_devbsdunit; /* the BSD unit number of the device */
147 uint64_t mnt_throttle_mask; /* the throttle mask of what devices will be affected by I/O from this mnt */
148 void *mnt_throttle_info; /* used by the throttle code */
149 int32_t mnt_crossref; /* refernces to cover lookups crossing into mp */
150 int32_t mnt_iterref; /* refernces to cover iterations; drained makes it -ve */
151 #if CONFIG_TRIGGERS
152 int32_t mnt_numtriggers; /* num of trigger vnodes for this mount */
153 vfs_trigger_callback_t *mnt_triggercallback;
154 void *mnt_triggerdata;
155 #endif
156 /* XXX 3762912 hack to support HFS filesystem 'owner' */
157 uid_t mnt_fsowner;
158 gid_t mnt_fsgroup;
159
160 struct label *mnt_mntlabel; /* MAC mount label */
161 struct label *mnt_fslabel; /* MAC default fs label */
162
163 /*
164 * cache the rootvp of the last mount point
165 * in the chain in the mount struct pointed
166 * to by the vnode sitting in '/'
167 * this cache is used to shortcircuit the
168 * mount chain traversal and allows us
169 * to traverse to the true underlying rootvp
170 * in 1 easy step inside of 'cache_lookup_path'
171 *
172 * make sure to validate against the cached vid
173 * in case the rootvp gets stolen away since
174 * we don't take an explicit long term reference
175 * on it when we mount it
176 */
177 vnode_t mnt_realrootvp;
178 uint32_t mnt_realrootvp_vid;
179 /*
180 * bumped each time a mount or unmount
181 * occurs... its used to invalidate
182 * 'mnt_realrootvp' from the cache
183 */
184 uint32_t mnt_generation;
185 /*
186 * if 'MNTK_AUTH_CACHE_TIMEOUT' is
187 * set, then 'mnt_authcache_ttl' is
188 * the time-to-live for the per-vnode authentication cache
189 * on this mount... if zero, no cache is maintained...
190 * if 'MNTK_AUTH_CACHE_TIMEOUT' isn't set, its the
191 * time-to-live for the cached lookup right for
192 * volumes marked 'MNTK_AUTH_OPAQUE'.
193 */
194 int mnt_authcache_ttl;
195 char fstypename_override[MFSTYPENAMELEN];
196
197 uint32_t mnt_iobufinuse;
198
199 void *mnt_disk_conditioner_info;
200
201 lck_mtx_t mnt_iter_lock; /* mutex that protects iteration of vnodes */
202 };
203
204 /*
205 * default number of seconds to keep cached lookup
206 * rights valid on mounts marked MNTK_AUTH_OPAQUE
207 */
208 #define CACHED_LOOKUP_RIGHT_TTL 2
209
210 /*
211 * ioflags
212 */
213 #define MNT_IOFLAGS_FUA_SUPPORTED 0x00000001
214 #define MNT_IOFLAGS_UNMAP_SUPPORTED 0x00000002
215 #define MNT_IOFLAGS_IOSCHED_SUPPORTED 0x00000004
216 #define MNT_IOFLAGS_CSUNMAP_SUPPORTED 0x00000008
217 #define MNT_IOFLAGS_SWAPPIN_SUPPORTED 0x00000010
218 #define MNT_IOFLAGS_FUSION_DRIVE 0x00000020
219 #define MNT_IOFLAGS_PERIPHERAL_DRIVE 0x00000040 /* External: Attached directly to the system (USB,TBT,FW,etc.) */
220
221 /*
222 * ioqueue depth for devices that don't report one
223 */
224 #define MNT_DEFAULT_IOQUEUE_DEPTH 32
225
226 /*
227 * mnt_ioscale value for the given ioqueue depth
228 */
229 #define MNT_IOSCALE(ioqueue_depth) ((ioqueue_depth + (MNT_DEFAULT_IOQUEUE_DEPTH - 1)) / MNT_DEFAULT_IOQUEUE_DEPTH)
230
231 /* mount point to which dead vps point to */
232 extern struct mount * dead_mountp;
233
234 /*
235 * Internal filesystem control flags stored in mnt_kern_flag.
236 *
237 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
238 * past the mount point. This keeps the subtree stable during mounts
239 * and unmounts.
240 *
241 * Note: We are counting down on new bit assignments. This is
242 * because the bits here were broken out from the high bits
243 * of the mount flags.
244 */
245 #define MNTK_SYSTEM 0x00000040 /* Volume associated with system volume (do not allow unmount) */
246 #define MNTK_NOSWAP 0x00000080 /* swap files cannot be used on this mount */
247 #define MNTK_SWAP_MOUNT 0x00000100 /* we are swapping to this mount */
248 #define MNTK_DENY_READDIREXT 0x00000200 /* Deny Extended-style readdir's for this volume */
249 #define MNTK_PERMIT_UNMOUNT 0x00000400 /* Allow (non-forced) unmounts by UIDs other than the one that mounted the volume */
250 #ifdef NFSCLIENT
251 #define MNTK_TYPENAME_OVERRIDE 0x00000800 /* override the fstypename for statfs() */
252 #endif /* NFSCLIENT */
253 #define MNTK_KERNEL_MOUNT 0x00001000 /* mount came from kernel side */
254 #ifdef CONFIG_IMGSRC_ACCESS
255 #define MNTK_HAS_MOVED 0x00002000
256 #define MNTK_BACKS_ROOT 0x00004000
257 #endif /* CONFIG_IMGSRC_ACCESS */
258 #define MNTK_AUTH_CACHE_TTL 0x00008000 /* rights cache has TTL - TTL of 0 disables cache */
259 #define MNTK_PATH_FROM_ID 0x00010000 /* mounted file system supports id-to-path lookups */
260 #define MNTK_UNMOUNT_PREFLIGHT 0x00020000 /* mounted file system wants preflight check during unmount */
261 #define MNTK_NAMED_STREAMS 0x00040000 /* mounted file system supports Named Streams VNOPs */
262 #define MNTK_EXTENDED_ATTRS 0x00080000 /* mounted file system supports Extended Attributes VNOPs */
263 #define MNTK_LOCK_LOCAL 0x00100000 /* advisory locking is done above the VFS itself */
264 #define MNTK_VIRTUALDEV 0x00200000 /* mounted on a virtual device i.e. a disk image */
265 #define MNTK_ROOTDEV 0x00400000 /* this filesystem resides on the same device as the root */
266 #define MNTK_SSD 0x00800000 /* underlying device is of the solid state variety */
267 #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
268 #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
269 #define MNTK_WANTRDWR 0x04000000 /* upgrade to read/write requested */
270 #if REV_ENDIAN_FS
271 #define MNT_REVEND 0x08000000 /* Reverse endian FS */
272 #endif /* REV_ENDIAN_FS */
273 #define MNTK_DIR_HARDLINKS 0x10000000 /* mounted file system supports directory hard links */
274 #define MNTK_AUTH_OPAQUE 0x20000000 /* authorisation decisions are not made locally */
275 #define MNTK_AUTH_OPAQUE_ACCESS 0x40000000 /* VNOP_ACCESS is reliable for remote auth */
276 #define MNTK_EXTENDED_SECURITY 0x80000000 /* extended security supported */
277
278 #define MNT_LNOTRESP 0x00000001 /* mount not responding */
279 #define MNT_LUNMOUNT 0x00000002 /* mount in unmount */
280 #define MNT_LFORCE 0x00000004 /* mount in forced unmount */
281 #define MNT_LDRAIN 0x00000008 /* mount in drain */
282 #define MNT_LITER 0x00000010 /* mount in iteration */
283 #define MNT_LNEWVN 0x00000020 /* mount has new vnodes created */
284 #define MNT_LWAIT 0x00000040 /* wait for unmount op */
285 #define MNT_LUNUSED 0x00000080 /* available flag bit, used to be MNT_LITERWAIT */
286 #define MNT_LDEAD 0x00000100 /* mount already unmounted*/
287 #define MNT_LNOSUB 0x00000200 /* submount - no recursion */
288
289
290 /*
291 * Generic file handle
292 */
293 #define NFS_MAX_FH_SIZE NFSV4_MAX_FH_SIZE
294 #define NFSV4_MAX_FH_SIZE 128
295 #define NFSV3_MAX_FH_SIZE 64
296 #define NFSV2_MAX_FH_SIZE 32
297 struct fhandle {
298 unsigned int fh_len; /* length of file handle */
299 unsigned char fh_data[NFS_MAX_FH_SIZE]; /* file handle value */
300 };
301 typedef struct fhandle fhandle_t;
302
303
304
305 /*
306 * Filesystem configuration information. One of these exists for each
307 * type of filesystem supported by the kernel. These are searched at
308 * mount time to identify the requested filesystem.
309 */
310 struct vfstable {
311 const struct vfsops *vfc_vfsops;/* filesystem operations vector */
312 char vfc_name[MFSNAMELEN]; /* filesystem type name */
313 int vfc_typenum; /* historic filesystem type number */
314 int vfc_refcount; /* number mounted of this type */
315 int vfc_flags; /* permanent flags */
316 int (*vfc_mountroot)(mount_t, vnode_t, vfs_context_t); /* if != NULL, routine to mount root */
317 struct vfstable *vfc_next; /* next in list */
318 int32_t vfc_reserved1;
319 int32_t vfc_reserved2;
320 int vfc_vfsflags; /* for optional types */
321 void * vfc_descptr; /* desc table allocated address */
322 int vfc_descsize; /* size allocated for desc table */
323 struct sysctl_oid *vfc_sysctl; /* dynamically registered sysctl node */
324 };
325
326 /* vfc_vfsflags: */
327 #define VFC_VFSLOCALARGS 0x002
328 #define VFC_VFSGENERICARGS 0x004
329 #define VFC_VFSNATIVEXATTR 0x010
330 #define VFC_VFSCANMOUNTROOT 0x020
331 #define VFC_VFSPREFLIGHT 0x040
332 #define VFC_VFSREADDIR_EXTENDED 0x080
333 #define VFC_VFS64BITREADY 0x100
334 #define VFC_VFSNOMACLABEL 0x1000
335 #define VFC_VFSVNOP_PAGEINV2 0x2000
336 #define VFC_VFSVNOP_PAGEOUTV2 0x4000
337 #define VFC_VFSVNOP_NOUPDATEID_RENAME 0x8000
338 #define VFC_VFSVNOP_SECLUDE_RENAME 0x10000
339
340 extern int maxvfstypenum; /* highest defined filesystem type */
341 extern struct vfstable *vfsconf; /* head of list of filesystem types */
342 extern const int maxvfsslots; /* Maximum statically allocated slots available to be used */
343 extern int numused_vfsslots; /* number of statically allocated slots already used */
344 extern int numregistered_fses; /* number of total registered filesystems */
345
346 /* the following two are xnu private */
347 struct vfstable * vfstable_add(struct vfstable *);
348 int vfstable_del(struct vfstable *);
349
350
351 struct vfsmount_args {
352 union {
353 struct {
354 char * mnt_fspec;
355 void * mnt_fsdata;
356 } mnt_localfs_args;
357 struct {
358 void * mnt_fsdata; /* FS specific */
359 } mnt_remotefs_args;
360 } mountfs_args;
361 };
362
363
364 /*
365 * LP64 *user* version of statfs structure.
366 * NOTE - must be kept in sync with struct statfs in mount.h
367 */
368 struct user64_statfs {
369 short f_otype; /* TEMPORARY SHADOW COPY OF f_type */
370 short f_oflags; /* TEMPORARY SHADOW COPY OF f_flags */
371 user64_long_t f_bsize; /* fundamental file system block size */
372 user64_long_t f_iosize; /* optimal transfer block size */
373 user64_long_t f_blocks; /* total data blocks in file system */
374 user64_long_t f_bfree; /* free blocks in fs */
375 user64_long_t f_bavail; /* free blocks avail to non-superuser */
376 user64_long_t f_files; /* total file nodes in file system */
377 user64_long_t f_ffree; /* free file nodes in fs */
378 fsid_t f_fsid; /* file system id */
379 uid_t f_owner; /* user that mounted the filesystem */
380 short f_reserved1; /* spare for later */
381 short f_type; /* type of filesystem */
382 user64_long_t f_flags; /* copy of mount exported flags */
383 user64_long_t f_reserved2[2]; /* reserved for future use */
384 char f_fstypename[MFSNAMELEN]; /* fs type name */
385 char f_mntonname[MNAMELEN]; /* directory on which mounted */
386 char f_mntfromname[MNAMELEN];/* mounted filesystem */
387 char f_reserved3; /* For alignment */
388 user64_long_t f_reserved4[4]; /* For future use */
389 };
390
391 /*
392 * ILP32 *user* version of statfs structure.
393 * NOTE - must be kept in sync with struct statfs in mount.h
394 */
395 struct user32_statfs {
396 short f_otype; /* TEMPORARY SHADOW COPY OF f_type */
397 short f_oflags; /* TEMPORARY SHADOW COPY OF f_flags */
398 user32_long_t f_bsize; /* fundamental file system block size */
399 user32_long_t f_iosize; /* optimal transfer block size */
400 user32_long_t f_blocks; /* total data blocks in file system */
401 user32_long_t f_bfree; /* free blocks in fs */
402 user32_long_t f_bavail; /* free blocks avail to non-superuser */
403 user32_long_t f_files; /* total file nodes in file system */
404 user32_long_t f_ffree; /* free file nodes in fs */
405 fsid_t f_fsid; /* file system id */
406 uid_t f_owner; /* user that mounted the filesystem */
407 short f_reserved1; /* spare for later */
408 short f_type; /* type of filesystem */
409 user32_long_t f_flags; /* copy of mount exported flags */
410 user32_long_t f_reserved2[2]; /* reserved for future use */
411 char f_fstypename[MFSNAMELEN]; /* fs type name */
412 char f_mntonname[MNAMELEN]; /* directory on which mounted */
413 char f_mntfromname[MNAMELEN];/* mounted filesystem */
414 char f_reserved3; /* For alignment */
415 user32_long_t f_reserved4[4]; /* For future use */
416 };
417
418 /*
419 * throttle I/Os are affected only by normal I/Os happening on the same spindle. Currently we use a 64-bit integer to
420 * represent what devices are affected, so we can handle at most 64 different spindles. Since
421 * throttled I/O is usually useful in non-server environment only, this number is enough in most cases.
422 */
423 #define LOWPRI_MAX_NUM_DEV 64
424
425 __BEGIN_DECLS
426
427 extern uint32_t mount_generation;
428 extern TAILQ_HEAD(mntlist, mount) mountlist;
429 void mount_list_lock(void);
430 void mount_list_unlock(void);
431 void mount_lock_init(mount_t);
432 void mount_lock_destroy(mount_t);
433 void mount_lock(mount_t);
434 void mount_lock_spin(mount_t);
435 void mount_unlock(mount_t);
436 void mount_iterate_lock(mount_t);
437 void mount_iterate_unlock(mount_t);
438 void mount_lock_renames(mount_t);
439 void mount_unlock_renames(mount_t);
440 void mount_ref(mount_t, int);
441 void mount_drop(mount_t, int);
442 int mount_refdrain(mount_t);
443
444 /* vfs_rootmountalloc should be kept as a private api */
445 errno_t vfs_rootmountalloc(const char *, const char *, mount_t *mpp);
446
447 int vfs_mount_rosv_data(void);
448 int vfs_mount_vm(void);
449
450 int vfs_mountroot(void);
451 void vfs_unmountall(void);
452 int safedounmount(struct mount *, int, vfs_context_t);
453 int dounmount(struct mount *, int, int, vfs_context_t);
454 void dounmount_submounts(struct mount *, int, vfs_context_t);
455
456 /* xnu internal api */
457 void mount_dropcrossref(mount_t, vnode_t, int);
458 mount_t mount_lookupby_volfsid(int, int);
459 mount_t mount_list_lookupby_fsid(fsid_t *, int, int);
460 int mount_list_add(mount_t);
461 void mount_list_remove(mount_t);
462 int mount_iterref(mount_t, int);
463 int mount_isdrained(mount_t, int);
464 void mount_iterdrop(mount_t);
465 void mount_iterdrain(mount_t);
466 void mount_iterreset(mount_t);
467
468 /* These flags are used as flag bits in the `internal_flags` argument to mount_common */
469 /* Private NFS spi */
470 #define KERNEL_MOUNT_NOAUTH 0x01 /* Don't check the UID of the directory we are mounting on */
471 #define KERNEL_MOUNT_PERMIT_UNMOUNT 0x02 /* Allow (non-forced) unmounts by users other the one who mounted the volume */
472 /* used by snapshot mounting SPI */
473 #define KERNEL_MOUNT_SNAPSHOT 0x04 /* Mounting a snapshot */
474 #define KERNEL_MOUNT_DATAVOL 0x08 /* mount the data volume */
475 #define KERNEL_MOUNT_VMVOL 0x10 /* mount the VM volume */
476
477
478 #if NFSCLIENT || DEVFS || ROUTEFS
479 /*
480 * NOTE: kernel_mount() does not force MNT_NOSUID, MNT_NOEXEC, or MNT_NODEC for non-privileged
481 * mounting credentials, as the mount(2) system call does.
482 */
483 int kernel_mount(char *, vnode_t, vnode_t, const char *, void *, size_t, int, uint32_t, vfs_context_t);
484 boolean_t vfs_iskernelmount(mount_t);
485 #endif
486
487 /* Throttled I/O API. KPI/SPI is in systm.h. */
488
489 int throttle_get_io_policy(struct uthread **ut);
490 int throttle_get_passive_io_policy(struct uthread **ut);
491 void *throttle_info_update_by_mount(mount_t mp);
492 void rethrottle_thread(uthread_t ut);
493
494
495 /* throttled I/O helper function */
496 /* convert the lowest bit to a device index */
497 extern int num_trailing_0(uint64_t n);
498
499 /* sync lock */
500 extern lck_mtx_t * sync_mtx_lck;
501
502 extern int sync_timeout_seconds;
503
504 __END_DECLS
505
506 #endif /* !_SYS_MOUNT_INTERNAL_H_ */