mount.h revision 188243
1/*- 2 * Copyright (c) 1989, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)mount.h 8.21 (Berkeley) 5/20/95 30 * $FreeBSD: head/sys/sys/mount.h 188243 2009-02-06 18:16:01Z trasz $ 31 */ 32 33#ifndef _SYS_MOUNT_H_ 34#define _SYS_MOUNT_H_ 35 36#include <sys/ucred.h> 37#include <sys/queue.h> 38#ifdef _KERNEL 39#include <sys/lock.h> 40#include <sys/lockmgr.h> 41#include <sys/_mutex.h> 42#endif 43 44/* 45 * NOTE: When changing statfs structure, mount structure, MNT_* flags or 46 * MNTK_* flags also update DDB show mount command in vfs_subr.c. 47 */ 48 49typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */ 50 51/* 52 * File identifier. 53 * These are unique per filesystem on a single machine. 54 */ 55#define MAXFIDSZ 16 56 57struct fid { 58 u_short fid_len; /* length of data in bytes */ 59 u_short fid_reserved; /* force longword alignment */ 60 char fid_data[MAXFIDSZ]; /* data (variable length) */ 61}; 62 63/* 64 * filesystem statistics 65 */ 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 */ 69struct statfs { 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 */ 92}; 93 94#ifdef _KERNEL 95#define OMFSNAMELEN 16 /* length of fs type name, including null */ 96#define OMNAMELEN (88 - 2 * sizeof(long)) /* size of on/from name bufs */ 97 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. */ 100struct ostatfs { 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 */ 122 /* 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. 126 */ 127 long f_spare[2]; /* unused spare */ 128}; 129 130#define MMAXOPTIONLEN 65536 /* maximum length of a mount option */ 131 132TAILQ_HEAD(vnodelst, vnode); 133 134struct vfsoptlist; 135struct vfsopt; 136 137/* 138 * Structure per mounted filesystem. Each mounted filesystem has an 139 * array of operations and an instance record. The filesystems are 140 * put on a doubly linked list. 141 * 142 * Lock reference: 143 * m - mountlist_mtx 144 * i - interlock 145 * 146 * Unmarked fields are considered stable as long as a ref is held. 147 * 148 */ 149struct mount { 150 struct mtx mnt_mtx; /* mount structure interlock */ 151 int mnt_gen; /* struct mount generation */ 152#define mnt_startzero mnt_list 153 TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */ 154 struct vfsops *mnt_op; /* operations on fs */ 155 struct vfsconf *mnt_vfc; /* configuration info */ 156 struct vnode *mnt_vnodecovered; /* vnode we mounted on */ 157 struct vnode *mnt_syncer; /* syncer vnode */ 158 int mnt_ref; /* (i) Reference count */ 159 struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */ 160 int mnt_nvnodelistsize; /* (i) # of vnodes */ 161 int mnt_writeopcount; /* (i) write syscalls pending */ 162 int mnt_kern_flag; /* (i) kernel only flags */ 163 u_int mnt_flag; /* (i) flags shared with user */ 164 u_int mnt_noasync; /* (i) # noasync overrides */ 165 struct vfsoptlist *mnt_opt; /* current mount options */ 166 struct vfsoptlist *mnt_optnew; /* new options passed to fs */ 167 int mnt_maxsymlinklen; /* max size of short symlink */ 168 struct statfs mnt_stat; /* cache of filesystem stats */ 169 struct ucred *mnt_cred; /* credentials of mounter */ 170 void * mnt_data; /* private data */ 171 time_t mnt_time; /* last time written*/ 172 int mnt_iosize_max; /* max size for clusters, etc */ 173 struct netexport *mnt_export; /* export list */ 174 struct label *mnt_label; /* MAC label for the fs */ 175 u_int mnt_hashseed; /* Random seed for vfs_hash */ 176 int mnt_lockref; /* (i) Lock reference count */ 177 int mnt_secondary_writes; /* (i) # of secondary writes */ 178 int mnt_secondary_accwrites;/* (i) secondary wr. starts */ 179 struct thread *mnt_susp_owner; /* (i) thread owning suspension */ 180#define mnt_endzero mnt_gjprovider 181 char *mnt_gjprovider; /* gjournal provider name */ 182 struct lock mnt_explock; /* vfs_export walkers lock */ 183}; 184 185struct vnode *__mnt_vnode_next(struct vnode **mvp, struct mount *mp); 186struct vnode *__mnt_vnode_first(struct vnode **mvp, struct mount *mp); 187void __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp); 188 189#define MNT_VNODE_FOREACH(vp, mp, mvp) \ 190 for (vp = __mnt_vnode_first(&(mvp), (mp)); \ 191 (vp) != NULL; vp = __mnt_vnode_next(&(mvp), (mp))) 192 193#define MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp) \ 194 __mnt_vnode_markerfree(&(mvp), (mp)) 195 196#define MNT_VNODE_FOREACH_ABORT(mp, mvp) \ 197 do { \ 198 MNT_ILOCK(mp); \ 199 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); \ 200 MNT_IUNLOCK(mp); \ 201 } while (0) 202 203#define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx) 204#define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx) 205#define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx) 206#define MNT_MTX(mp) (&(mp)->mnt_mtx) 207#define MNT_REF(mp) (mp)->mnt_ref++ 208#define MNT_REL(mp) do { \ 209 KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref")); \ 210 (mp)->mnt_ref--; \ 211 if ((mp)->mnt_ref == 0) \ 212 wakeup((mp)); \ 213} while (0) 214 215#endif /* _KERNEL */ 216 217/* 218 * User specifiable flags. 219 */ 220#define MNT_RDONLY 0x00000001 /* read only filesystem */ 221#define MNT_SYNCHRONOUS 0x00000002 /* filesystem written synchronously */ 222#define MNT_NOEXEC 0x00000004 /* can't exec from filesystem */ 223#define MNT_NOSUID 0x00000008 /* don't honor setuid bits on fs */ 224#define MNT_UNION 0x00000020 /* union with underlying filesystem */ 225#define MNT_ASYNC 0x00000040 /* filesystem written asynchronously */ 226#define MNT_SUIDDIR 0x00100000 /* special handling of SUID on dirs */ 227#define MNT_SOFTDEP 0x00200000 /* soft updates being done */ 228#define MNT_NOSYMFOLLOW 0x00400000 /* do not follow symlinks */ 229#define MNT_GJOURNAL 0x02000000 /* GEOM journal support enabled */ 230#define MNT_MULTILABEL 0x04000000 /* MAC support for individual objects */ 231#define MNT_ACLS 0x08000000 /* ACL support enabled */ 232#define MNT_NOATIME 0x10000000 /* disable update of file access time */ 233#define MNT_NOCLUSTERR 0x40000000 /* disable cluster read */ 234#define MNT_NOCLUSTERW 0x80000000 /* disable cluster write */ 235 236/* 237 * NFS export related mount flags. 238 */ 239#define MNT_EXRDONLY 0x00000080 /* exported read only */ 240#define MNT_EXPORTED 0x00000100 /* filesystem is exported */ 241#define MNT_DEFEXPORTED 0x00000200 /* exported to the world */ 242#define MNT_EXPORTANON 0x00000400 /* use anon uid mapping for everyone */ 243#define MNT_EXKERB 0x00000800 /* exported with Kerberos uid mapping */ 244#define MNT_EXPUBLIC 0x20000000 /* public export (WebNFS) */ 245 246/* 247 * Flags set by internal operations, 248 * but visible to the user. 249 * XXX some of these are not quite right.. (I've never seen the root flag set) 250 */ 251#define MNT_LOCAL 0x00001000 /* filesystem is stored locally */ 252#define MNT_QUOTA 0x00002000 /* quotas are enabled on filesystem */ 253#define MNT_ROOTFS 0x00004000 /* identifies the root filesystem */ 254#define MNT_USER 0x00008000 /* mounted by a user */ 255#define MNT_IGNORE 0x00800000 /* do not show entry in df */ 256 257/* 258 * Mask of flags that are visible to statfs(). 259 * XXX I think that this could now become (~(MNT_CMDFLAGS)) 260 * but the 'mount' program may need changing to handle this. 261 */ 262#define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \ 263 MNT_NOSUID | MNT_UNION | \ 264 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \ 265 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \ 266 MNT_LOCAL | MNT_USER | MNT_QUOTA | \ 267 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \ 268 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \ 269 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \ 270 MNT_GJOURNAL | MNT_MULTILABEL | MNT_ACLS) 271 272/* Mask of flags that can be updated. */ 273#define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \ 274 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \ 275 MNT_NOATIME | \ 276 MNT_NOSYMFOLLOW | MNT_IGNORE | \ 277 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \ 278 MNT_ACLS | MNT_USER) 279 280/* 281 * External filesystem command modifier flags. 282 * Unmount can use the MNT_FORCE flag. 283 * XXX: These are not STATES and really should be somewhere else. 284 * XXX: MNT_BYFSID collides with MNT_ACLS, but because MNT_ACLS is only used for 285 * mount(2) and MNT_BYFSID is only used for unmount(2) it's harmless. 286 */ 287#define MNT_UPDATE 0x00010000 /* not a real mount, just an update */ 288#define MNT_DELEXPORT 0x00020000 /* delete export host lists */ 289#define MNT_RELOAD 0x00040000 /* reload filesystem data */ 290#define MNT_FORCE 0x00080000 /* force unmount or readonly change */ 291#define MNT_SNAPSHOT 0x01000000 /* snapshot the filesystem */ 292#define MNT_BYFSID 0x08000000 /* specify filesystem by ID. */ 293#define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \ 294 MNT_FORCE | MNT_SNAPSHOT | MNT_BYFSID) 295/* 296 * Still available. 297 */ 298#define MNT_SPARE_0x00000010 0x00000010 299/* 300 * Internal filesystem control flags stored in mnt_kern_flag. 301 * 302 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed 303 * past the mount point. This keeps the subtree stable during mounts 304 * and unmounts. 305 * 306 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while 307 * dounmount() is still waiting to lock the mountpoint. This allows 308 * the filesystem to cancel operations that might otherwise deadlock 309 * with the unmount attempt (used by NFS). 310 * 311 * MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated 312 * to allow for failed unmount attempt to restore the syncer vnode for 313 * the mount. 314 */ 315#define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */ 316#define MNTK_ASYNC 0x00000002 /* filtered async flag */ 317#define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */ 318#define MNTK_NOINSMNTQ 0x00000008 /* insmntque is not allowed */ 319#define MNTK_DRAINING 0x00000010 /* lock draining is happening */ 320#define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */ 321#define MNTK_UNMOUNT 0x01000000 /* unmount in progress */ 322#define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */ 323#define MNTK_SUSPEND 0x08000000 /* request write suspension */ 324#define MNTK_SUSPEND2 0x04000000 /* block secondary writes */ 325#define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */ 326#define MNTK_MPSAFE 0x20000000 /* Filesystem is MPSAFE. */ 327#define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */ 328#define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */ 329 330/* 331 * Sysctl CTL_VFS definitions. 332 * 333 * Second level identifier specifies which filesystem. Second level 334 * identifier VFS_VFSCONF returns information about all filesystems. 335 * Second level identifier VFS_GENERIC is non-terminal. 336 */ 337#define VFS_VFSCONF 0 /* get configured filesystems */ 338#define VFS_GENERIC 0 /* generic filesystem information */ 339/* 340 * Third level identifiers for VFS_GENERIC are given below; third 341 * level identifiers for specific filesystems are given in their 342 * mount specific header files. 343 */ 344#define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */ 345#define VFS_CONF 2 /* struct: vfsconf for filesystem given 346 as next argument */ 347 348/* 349 * Flags for various system call interfaces. 350 * 351 * waitfor flags to vfs_sync() and getfsstat() 352 */ 353#define MNT_WAIT 1 /* synchronously wait for I/O to complete */ 354#define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */ 355#define MNT_LAZY 3 /* push data not written by filesystem syncer */ 356#define MNT_SUSPEND 4 /* Suspend file system after sync */ 357 358/* 359 * Generic file handle 360 */ 361struct fhandle { 362 fsid_t fh_fsid; /* Filesystem id of mount point */ 363 struct fid fh_fid; /* Filesys specific id */ 364}; 365typedef struct fhandle fhandle_t; 366 367/* 368 * Old export arguments without security flavor list 369 */ 370struct oexport_args { 371 int ex_flags; /* export related flags */ 372 uid_t ex_root; /* mapping for root uid */ 373 struct xucred ex_anon; /* mapping for anonymous user */ 374 struct sockaddr *ex_addr; /* net address to which exported */ 375 u_char ex_addrlen; /* and the net address length */ 376 struct sockaddr *ex_mask; /* mask of valid bits in saddr */ 377 u_char ex_masklen; /* and the smask length */ 378 char *ex_indexfile; /* index file for WebNFS URLs */ 379}; 380 381/* 382 * Export arguments for local filesystem mount calls. 383 */ 384#define MAXSECFLAVORS 5 385struct export_args { 386 int ex_flags; /* export related flags */ 387 uid_t ex_root; /* mapping for root uid */ 388 struct xucred ex_anon; /* mapping for anonymous user */ 389 struct sockaddr *ex_addr; /* net address to which exported */ 390 u_char ex_addrlen; /* and the net address length */ 391 struct sockaddr *ex_mask; /* mask of valid bits in saddr */ 392 u_char ex_masklen; /* and the smask length */ 393 char *ex_indexfile; /* index file for WebNFS URLs */ 394 int ex_numsecflavors; /* security flavor count */ 395 int ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */ 396}; 397 398/* 399 * Structure holding information for a publicly exported filesystem 400 * (WebNFS). Currently the specs allow just for one such filesystem. 401 */ 402struct nfs_public { 403 int np_valid; /* Do we hold valid information */ 404 fhandle_t np_handle; /* Filehandle for pub fs (internal) */ 405 struct mount *np_mount; /* Mountpoint of exported fs */ 406 char *np_index; /* Index file */ 407}; 408 409/* 410 * Filesystem configuration information. One of these exists for each 411 * type of filesystem supported by the kernel. These are searched at 412 * mount time to identify the requested filesystem. 413 * 414 * XXX: Never change the first two arguments! 415 */ 416struct vfsconf { 417 u_int vfc_version; /* ABI version number */ 418 char vfc_name[MFSNAMELEN]; /* filesystem type name */ 419 struct vfsops *vfc_vfsops; /* filesystem operations vector */ 420 int vfc_typenum; /* historic filesystem type number */ 421 int vfc_refcount; /* number mounted of this type */ 422 int vfc_flags; /* permanent flags */ 423 struct vfsoptdecl *vfc_opts; /* mount options */ 424 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */ 425}; 426 427/* Userland version of the struct vfsconf. */ 428struct xvfsconf { 429 struct vfsops *vfc_vfsops; /* filesystem operations vector */ 430 char vfc_name[MFSNAMELEN]; /* filesystem type name */ 431 int vfc_typenum; /* historic filesystem type number */ 432 int vfc_refcount; /* number mounted of this type */ 433 int vfc_flags; /* permanent flags */ 434 struct vfsconf *vfc_next; /* next in list */ 435}; 436 437#ifndef BURN_BRIDGES 438struct ovfsconf { 439 void *vfc_vfsops; 440 char vfc_name[32]; 441 int vfc_index; 442 int vfc_refcount; 443 int vfc_flags; 444}; 445#endif 446 447/* 448 * NB: these flags refer to IMPLEMENTATION properties, not properties of 449 * any actual mounts; i.e., it does not make sense to change the flags. 450 */ 451#define VFCF_STATIC 0x00010000 /* statically compiled into kernel */ 452#define VFCF_NETWORK 0x00020000 /* may get data over the network */ 453#define VFCF_READONLY 0x00040000 /* writes are not implemented */ 454#define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */ 455#define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */ 456#define VFCF_UNICODE 0x00200000 /* stores file names as Unicode */ 457#define VFCF_JAIL 0x00400000 /* can be mounted from within a jail */ 458#define VFCF_DELEGADMIN 0x00800000 /* supports delegated administration */ 459 460typedef uint32_t fsctlop_t; 461 462struct vfsidctl { 463 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */ 464 fsid_t vc_fsid; /* fsid to operate on */ 465 char vc_fstypename[MFSNAMELEN]; 466 /* type of fs 'nfs' or '*' */ 467 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */ 468 void *vc_ptr; /* pointer to data structure */ 469 size_t vc_len; /* sizeof said structure */ 470 u_int32_t vc_spare[12]; /* spare (must be zero) */ 471}; 472 473/* vfsidctl API version. */ 474#define VFS_CTL_VERS1 0x01 475 476/* 477 * New style VFS sysctls, do not reuse/conflict with the namespace for 478 * private sysctls. 479 * All "global" sysctl ops have the 33rd bit set: 480 * 0x...1.... 481 * Private sysctl ops should have the 33rd bit unset. 482 */ 483#define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */ 484#define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */ 485#define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */ 486 487struct vfsquery { 488 u_int32_t vq_flags; 489 u_int32_t vq_spare[31]; 490}; 491 492/* vfsquery flags */ 493#define VQ_NOTRESP 0x0001 /* server down */ 494#define VQ_NEEDAUTH 0x0002 /* server bad auth */ 495#define VQ_LOWDISK 0x0004 /* we're low on space */ 496#define VQ_MOUNT 0x0008 /* new filesystem arrived */ 497#define VQ_UNMOUNT 0x0010 /* filesystem has left */ 498#define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */ 499#define VQ_ASSIST 0x0040 /* filesystem needs assistance from external 500 program */ 501#define VQ_NOTRESPLOCK 0x0080 /* server lockd down */ 502#define VQ_FLAG0100 0x0100 /* placeholder */ 503#define VQ_FLAG0200 0x0200 /* placeholder */ 504#define VQ_FLAG0400 0x0400 /* placeholder */ 505#define VQ_FLAG0800 0x0800 /* placeholder */ 506#define VQ_FLAG1000 0x1000 /* placeholder */ 507#define VQ_FLAG2000 0x2000 /* placeholder */ 508#define VQ_FLAG4000 0x4000 /* placeholder */ 509#define VQ_FLAG8000 0x8000 /* placeholder */ 510 511#ifdef _KERNEL 512/* Point a sysctl request at a vfsidctl's data. */ 513#define VCTLTOREQ(vc, req) \ 514 do { \ 515 (req)->newptr = (vc)->vc_ptr; \ 516 (req)->newlen = (vc)->vc_len; \ 517 (req)->newidx = 0; \ 518 } while (0) 519#endif 520 521struct iovec; 522struct uio; 523 524#ifdef _KERNEL 525 526/* 527 * vfs_busy specific flags and mask. 528 */ 529#define MBF_NOWAIT 0x01 530#define MBF_MNTLSTLOCK 0x02 531#define MBF_MASK (MBF_NOWAIT | MBF_MNTLSTLOCK) 532 533#ifdef MALLOC_DECLARE 534MALLOC_DECLARE(M_MOUNT); 535#endif 536extern int maxvfsconf; /* highest defined filesystem type */ 537extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */ 538 539TAILQ_HEAD(vfsconfhead, vfsconf); 540extern struct vfsconfhead vfsconf; 541 542/* 543 * Operations supported on mounted filesystem. 544 */ 545struct mount_args; 546struct nameidata; 547struct sysctl_req; 548struct mntarg; 549 550typedef int vfs_cmount_t(struct mntarg *ma, void *data, int flags, struct thread *td); 551typedef int vfs_unmount_t(struct mount *mp, int mntflags, struct thread *td); 552typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp, 553 struct thread *td); 554typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, 555 void *arg, struct thread *td); 556typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp, 557 struct thread *td); 558typedef int vfs_sync_t(struct mount *mp, int waitfor, struct thread *td); 559typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags, 560 struct vnode **vpp); 561typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp); 562typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam, 563 int *extflagsp, struct ucred **credanonp, 564 int *numsecflavors, int **secflavors); 565typedef int vfs_init_t(struct vfsconf *); 566typedef int vfs_uninit_t(struct vfsconf *); 567typedef int vfs_extattrctl_t(struct mount *mp, int cmd, 568 struct vnode *filename_vp, int attrnamespace, 569 const char *attrname, struct thread *td); 570typedef int vfs_mount_t(struct mount *mp, struct thread *td); 571typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op, 572 struct sysctl_req *req); 573typedef void vfs_susp_clean_t(struct mount *mp); 574 575struct vfsops { 576 vfs_mount_t *vfs_mount; 577 vfs_cmount_t *vfs_cmount; 578 vfs_unmount_t *vfs_unmount; 579 vfs_root_t *vfs_root; 580 vfs_quotactl_t *vfs_quotactl; 581 vfs_statfs_t *vfs_statfs; 582 vfs_sync_t *vfs_sync; 583 vfs_vget_t *vfs_vget; 584 vfs_fhtovp_t *vfs_fhtovp; 585 vfs_checkexp_t *vfs_checkexp; 586 vfs_init_t *vfs_init; 587 vfs_uninit_t *vfs_uninit; 588 vfs_extattrctl_t *vfs_extattrctl; 589 vfs_sysctl_t *vfs_sysctl; 590 vfs_susp_clean_t *vfs_susp_clean; 591}; 592 593vfs_statfs_t __vfs_statfs; 594 595#define VFS_MOUNT(MP, P) (*(MP)->mnt_op->vfs_mount)(MP, P) 596#define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P) 597#define VFS_ROOT(MP, FLAGS, VPP, P) \ 598 (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP, P) 599#define VFS_QUOTACTL(MP,C,U,A,P) (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P) 600#define VFS_STATFS(MP, SBP, P) __vfs_statfs((MP), (SBP), (P)) 601#define VFS_SYNC(MP, WAIT, P) (*(MP)->mnt_op->vfs_sync)(MP, WAIT, P) 602#define VFS_VGET(MP, INO, FLAGS, VPP) \ 603 (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP) 604#define VFS_FHTOVP(MP, FIDP, VPP) \ 605 (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP) 606#define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) \ 607 (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC, SEC) 608#define VFS_EXTATTRCTL(MP, C, FN, NS, N, P) \ 609 (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N, P) 610#define VFS_SYSCTL(MP, OP, REQ) \ 611 (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ) 612#define VFS_SUSP_CLEAN(MP) \ 613 ({if (*(MP)->mnt_op->vfs_susp_clean != NULL) \ 614 (*(MP)->mnt_op->vfs_susp_clean)(MP); }) 615 616extern int mpsafe_vfs; 617 618#define VFS_NEEDSGIANT_(MP) \ 619 (!mpsafe_vfs || ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0)) 620 621#define VFS_NEEDSGIANT(MP) __extension__ \ 622({ \ 623 struct mount *_mp; \ 624 _mp = (MP); \ 625 VFS_NEEDSGIANT_(_mp); \ 626}) 627 628#define VFS_LOCK_GIANT(MP) __extension__ \ 629({ \ 630 int _locked; \ 631 struct mount *_mp; \ 632 _mp = (MP); \ 633 if (VFS_NEEDSGIANT_(_mp)) { \ 634 mtx_lock(&Giant); \ 635 _locked = 1; \ 636 } else \ 637 _locked = 0; \ 638 _locked; \ 639}) 640#define VFS_UNLOCK_GIANT(locked) if ((locked)) mtx_unlock(&Giant); 641#define VFS_ASSERT_GIANT(MP) do \ 642{ \ 643 struct mount *_mp; \ 644 _mp = (MP); \ 645 if (VFS_NEEDSGIANT_(_mp)) \ 646 mtx_assert(&Giant, MA_OWNED); \ 647} while (0) 648 649#define VFS_KNOTE_LOCKED(vp, hint) do \ 650{ \ 651 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \ 652 VN_KNOTE((vp), (hint), 1); \ 653} while (0) 654 655#define VFS_KNOTE_UNLOCKED(vp, hint) do \ 656{ \ 657 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \ 658 VN_KNOTE((vp), (hint), 0); \ 659} while (0) 660 661#include <sys/module.h> 662 663/* 664 * Version numbers. 665 */ 666#define VFS_VERSION_00 0x19660120 667#define VFS_VERSION VFS_VERSION_00 668 669#define VFS_SET(vfsops, fsname, flags) \ 670 static struct vfsconf fsname ## _vfsconf = { \ 671 .vfc_version = VFS_VERSION, \ 672 .vfc_name = #fsname, \ 673 .vfc_vfsops = &vfsops, \ 674 .vfc_typenum = -1, \ 675 .vfc_flags = flags, \ 676 }; \ 677 static moduledata_t fsname ## _mod = { \ 678 #fsname, \ 679 vfs_modevent, \ 680 & fsname ## _vfsconf \ 681 }; \ 682 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE) 683 684extern char *mountrootfsname; 685 686/* 687 * exported vnode operations 688 */ 689 690int dounmount(struct mount *, int, struct thread *); 691 692int kernel_mount(struct mntarg *ma, int flags); 693int kernel_vmount(int flags, ...); 694struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len); 695struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name); 696struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...); 697struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len); 698void statfs_scale_blocks(struct statfs *sf, long max_size); 699struct vfsconf *vfs_byname(const char *); 700struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *); 701void vfs_mount_destroy(struct mount *); 702void vfs_event_signal(fsid_t *, u_int32_t, intptr_t); 703void vfs_freeopts(struct vfsoptlist *opts); 704void vfs_deleteopt(struct vfsoptlist *opts, const char *name); 705int vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val); 706int vfs_getopt(struct vfsoptlist *, const char *, void **, int *); 707char *vfs_getopts(struct vfsoptlist *, const char *, int *error); 708int vfs_copyopt(struct vfsoptlist *, const char *, void *, int); 709int vfs_filteropt(struct vfsoptlist *, const char **legal); 710int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...); 711int vfs_setpublicfs /* set publicly exported fs */ 712 (struct mount *, struct netexport *, struct export_args *); 713void vfs_msync(struct mount *, int); 714int vfs_busy(struct mount *, int); 715int vfs_export /* process mount export info */ 716 (struct mount *, struct export_args *); 717int vfs_allocate_syncvnode(struct mount *); 718int vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions); 719void vfs_getnewfsid(struct mount *); 720struct cdev *vfs_getrootfsid(struct mount *); 721struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */ 722struct mount *vfs_busyfs(fsid_t *); 723int vfs_modevent(module_t, int, void *); 724void vfs_mount_error(struct mount *, const char *, ...); 725void vfs_mountroot(void); /* mount our root filesystem */ 726void vfs_mountedfrom(struct mount *, const char *from); 727void vfs_ref(struct mount *); 728void vfs_rel(struct mount *); 729struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *, 730 struct ucred *); 731int vfs_suser(struct mount *, struct thread *); 732void vfs_unbusy(struct mount *); 733void vfs_unmountall(void); 734extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */ 735extern struct mtx mountlist_mtx; 736extern struct nfs_public nfs_pub; 737 738/* 739 * Declarations for these vfs default operations are located in 740 * kern/vfs_default.c, they should be used instead of making "dummy" 741 * functions or casting entries in the VFS op table to "enopnotsupp()". 742 */ 743vfs_root_t vfs_stdroot; 744vfs_quotactl_t vfs_stdquotactl; 745vfs_statfs_t vfs_stdstatfs; 746vfs_sync_t vfs_stdsync; 747vfs_sync_t vfs_stdnosync; 748vfs_vget_t vfs_stdvget; 749vfs_fhtovp_t vfs_stdfhtovp; 750vfs_checkexp_t vfs_stdcheckexp; 751vfs_init_t vfs_stdinit; 752vfs_uninit_t vfs_stduninit; 753vfs_extattrctl_t vfs_stdextattrctl; 754vfs_sysctl_t vfs_stdsysctl; 755 756#else /* !_KERNEL */ 757 758#include <sys/cdefs.h> 759 760struct stat; 761 762__BEGIN_DECLS 763int fhopen(const struct fhandle *, int); 764int fhstat(const struct fhandle *, struct stat *); 765int fhstatfs(const struct fhandle *, struct statfs *); 766int fstatfs(int, struct statfs *); 767int getfh(const char *, fhandle_t *); 768int getfsstat(struct statfs *, long, int); 769int getmntinfo(struct statfs **, int); 770int lgetfh(const char *, fhandle_t *); 771int mount(const char *, const char *, int, void *); 772int nmount(struct iovec *, unsigned int, int); 773int statfs(const char *, struct statfs *); 774int unmount(const char *, int); 775 776/* C library stuff */ 777int getvfsbyname(const char *, struct xvfsconf *); 778__END_DECLS 779 780#endif /* _KERNEL */ 781 782#endif /* !_SYS_MOUNT_H_ */ 783