mount.h revision 156451
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 156451 2006-03-08 23:43:39Z tegge $ 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/lockmgr.h> 40#include <sys/_lock.h> 41#include <sys/_mutex.h> 42#endif 43 44typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */ 45 46/* 47 * File identifier. 48 * These are unique per filesystem on a single machine. 49 */ 50#define MAXFIDSZ 16 51 52struct fid { 53 u_short fid_len; /* length of data in bytes */ 54 u_short fid_reserved; /* force longword alignment */ 55 char fid_data[MAXFIDSZ]; /* data (variable length) */ 56}; 57 58/* 59 * filesystem statistics 60 */ 61#define MFSNAMELEN 16 /* length of type name including null */ 62#define MNAMELEN 88 /* size of on/from name bufs */ 63#define STATFS_VERSION 0x20030518 /* current version number */ 64struct statfs { 65 uint32_t f_version; /* structure version number */ 66 uint32_t f_type; /* type of filesystem */ 67 uint64_t f_flags; /* copy of mount exported flags */ 68 uint64_t f_bsize; /* filesystem fragment size */ 69 uint64_t f_iosize; /* optimal transfer block size */ 70 uint64_t f_blocks; /* total data blocks in filesystem */ 71 uint64_t f_bfree; /* free blocks in filesystem */ 72 int64_t f_bavail; /* free blocks avail to non-superuser */ 73 uint64_t f_files; /* total file nodes in filesystem */ 74 int64_t f_ffree; /* free nodes avail to non-superuser */ 75 uint64_t f_syncwrites; /* count of sync writes since mount */ 76 uint64_t f_asyncwrites; /* count of async writes since mount */ 77 uint64_t f_syncreads; /* count of sync reads since mount */ 78 uint64_t f_asyncreads; /* count of async reads since mount */ 79 uint64_t f_spare[10]; /* unused spare */ 80 uint32_t f_namemax; /* maximum filename length */ 81 uid_t f_owner; /* user that mounted the filesystem */ 82 fsid_t f_fsid; /* filesystem id */ 83 char f_charspare[80]; /* spare string space */ 84 char f_fstypename[MFSNAMELEN]; /* filesystem type name */ 85 char f_mntfromname[MNAMELEN]; /* mounted filesystem */ 86 char f_mntonname[MNAMELEN]; /* directory on which mounted */ 87}; 88 89#ifdef _KERNEL 90#define OMFSNAMELEN 16 /* length of fs type name, including null */ 91#define OMNAMELEN (88 - 2 * sizeof(long)) /* size of on/from name bufs */ 92 93/* XXX getfsstat.2 is out of date with write and read counter changes here. */ 94/* XXX statfs.2 is out of date with read counter changes here. */ 95struct ostatfs { 96 long f_spare2; /* placeholder */ 97 long f_bsize; /* fundamental filesystem block size */ 98 long f_iosize; /* optimal transfer block size */ 99 long f_blocks; /* total data blocks in filesystem */ 100 long f_bfree; /* free blocks in fs */ 101 long f_bavail; /* free blocks avail to non-superuser */ 102 long f_files; /* total file nodes in filesystem */ 103 long f_ffree; /* free file nodes in fs */ 104 fsid_t f_fsid; /* filesystem id */ 105 uid_t f_owner; /* user that mounted the filesystem */ 106 int f_type; /* type of filesystem */ 107 int f_flags; /* copy of mount exported flags */ 108 long f_syncwrites; /* count of sync writes since mount */ 109 long f_asyncwrites; /* count of async writes since mount */ 110 char f_fstypename[OMFSNAMELEN]; /* fs type name */ 111 char f_mntonname[OMNAMELEN]; /* directory on which mounted */ 112 long f_syncreads; /* count of sync reads since mount */ 113 long f_asyncreads; /* count of async reads since mount */ 114 short f_spares1; /* unused spare */ 115 char f_mntfromname[OMNAMELEN];/* mounted filesystem */ 116 short f_spares2; /* unused spare */ 117 /* 118 * XXX on machines where longs are aligned to 8-byte boundaries, there 119 * is an unnamed int32_t here. This spare was after the apparent end 120 * of the struct until we bit off the read counters from f_mntonname. 121 */ 122 long f_spare[2]; /* unused spare */ 123}; 124 125#define MMAXOPTIONLEN 65536 /* maximum length of a mount option */ 126 127TAILQ_HEAD(vnodelst, vnode); 128 129struct vfsoptlist; 130struct vfsopt; 131 132/* 133 * Structure per mounted filesystem. Each mounted filesystem has an 134 * array of operations and an instance record. The filesystems are 135 * put on a doubly linked list. 136 * 137 * Lock reference: 138 * m - mountlist_mtx 139 * i - interlock 140 * l - mnt_lock 141 * 142 * Unmarked fields are considered stable as long as a ref is held. 143 * 144 */ 145struct mount { 146 TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */ 147 struct vfsops *mnt_op; /* operations on fs */ 148 struct vfsconf *mnt_vfc; /* configuration info */ 149 struct vnode *mnt_vnodecovered; /* vnode we mounted on */ 150 struct vnode *mnt_syncer; /* syncer vnode */ 151 struct lock mnt_lock; /* mount structure lock */ 152 struct mtx mnt_mtx; /* mount structure interlock */ 153 int mnt_ref; /* (i) Reference count */ 154 struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */ 155 int mnt_nvnodelistsize; /* (i) # of vnodes */ 156 int mnt_writeopcount; /* (i) write syscalls pending */ 157 int mnt_kern_flag; /* (i) kernel only flags */ 158 u_int mnt_flag; /* flags shared with user */ 159 struct vfsoptlist *mnt_opt; /* current mount options */ 160 struct vfsoptlist *mnt_optnew; /* new options passed to fs */ 161 int mnt_maxsymlinklen; /* max size of short symlink */ 162 struct statfs mnt_stat; /* cache of filesystem stats */ 163 struct ucred *mnt_cred; /* credentials of mounter */ 164 void * mnt_data; /* private data */ 165 time_t mnt_time; /* last time written*/ 166 int mnt_iosize_max; /* max size for clusters, etc */ 167 struct netexport *mnt_export; /* export list */ 168 struct label *mnt_mntlabel; /* MAC label for the mount */ 169 struct label *mnt_fslabel; /* MAC label for the fs */ 170 u_int mnt_hashseed; /* Random seed for vfs_hash */ 171 int mnt_markercnt; /* marker vnodes in use */ 172 int mnt_holdcnt; /* hold count */ 173 int mnt_holdcntwaiters; /* waits on hold count */ 174 int mnt_secondary_writes; /* (i) # of secondary writes */ 175 int mnt_secondary_accwrites;/* (i) secondary wr. starts */ 176}; 177 178struct vnode *__mnt_vnode_next(struct vnode **mvp, struct mount *mp); 179struct vnode *__mnt_vnode_first(struct vnode **mvp, struct mount *mp); 180void __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp); 181 182#define MNT_VNODE_FOREACH(vp, mp, mvp) \ 183 for (vp = __mnt_vnode_first(&(mvp), (mp)); \ 184 (vp) != NULL; vp = __mnt_vnode_next(&(mvp), (mp))) 185 186#define MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp) \ 187 __mnt_vnode_markerfree(&(mvp), (mp)) 188 189#define MNT_VNODE_FOREACH_ABORT(mp, mvp) \ 190 do { \ 191 MNT_ILOCK(mp); \ 192 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); \ 193 MNT_IUNLOCK(mp); \ 194 } while (0) 195 196#define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx) 197#define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx) 198#define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx) 199#define MNT_MTX(mp) (&(mp)->mnt_mtx) 200#define MNT_REF(mp) (mp)->mnt_ref++ 201#define MNT_REL(mp) do { \ 202 (mp)->mnt_ref--; \ 203 if ((mp)->mnt_ref == 0) \ 204 wakeup((mp)); \ 205} while (0) 206 207#endif /* _KERNEL */ 208 209/* 210 * User specifiable flags. 211 */ 212#define MNT_RDONLY 0x00000001 /* read only filesystem */ 213#define MNT_SYNCHRONOUS 0x00000002 /* filesystem written synchronously */ 214#define MNT_NOEXEC 0x00000004 /* can't exec from filesystem */ 215#define MNT_NOSUID 0x00000008 /* don't honor setuid bits on fs */ 216#define MNT_UNION 0x00000020 /* union with underlying filesystem */ 217#define MNT_ASYNC 0x00000040 /* filesystem written asynchronously */ 218#define MNT_SUIDDIR 0x00100000 /* special handling of SUID on dirs */ 219#define MNT_SOFTDEP 0x00200000 /* soft updates being done */ 220#define MNT_NOSYMFOLLOW 0x00400000 /* do not follow symlinks */ 221#define MNT_MULTILABEL 0x04000000 /* MAC support for individual objects */ 222#define MNT_ACLS 0x08000000 /* ACL support enabled */ 223#define MNT_NOATIME 0x10000000 /* disable update of file access time */ 224#define MNT_NOCLUSTERR 0x40000000 /* disable cluster read */ 225#define MNT_NOCLUSTERW 0x80000000 /* disable cluster write */ 226 227/* 228 * NFS export related mount flags. 229 */ 230#define MNT_EXRDONLY 0x00000080 /* exported read only */ 231#define MNT_EXPORTED 0x00000100 /* filesystem is exported */ 232#define MNT_DEFEXPORTED 0x00000200 /* exported to the world */ 233#define MNT_EXPORTANON 0x00000400 /* use anon uid mapping for everyone */ 234#define MNT_EXKERB 0x00000800 /* exported with Kerberos uid mapping */ 235#define MNT_EXPUBLIC 0x20000000 /* public export (WebNFS) */ 236 237/* 238 * Flags set by internal operations, 239 * but visible to the user. 240 * XXX some of these are not quite right.. (I've never seen the root flag set) 241 */ 242#define MNT_LOCAL 0x00001000 /* filesystem is stored locally */ 243#define MNT_QUOTA 0x00002000 /* quotas are enabled on filesystem */ 244#define MNT_ROOTFS 0x00004000 /* identifies the root filesystem */ 245#define MNT_USER 0x00008000 /* mounted by a user */ 246#define MNT_IGNORE 0x00800000 /* do not show entry in df */ 247 248/* 249 * Mask of flags that are visible to statfs(). 250 * XXX I think that this could now become (~(MNT_CMDFLAGS)) 251 * but the 'mount' program may need changing to handle this. 252 */ 253#define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \ 254 MNT_NOSUID | MNT_UNION | \ 255 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \ 256 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \ 257 MNT_LOCAL | MNT_USER | MNT_QUOTA | \ 258 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \ 259 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \ 260 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \ 261 MNT_MULTILABEL | MNT_ACLS) 262 263/* Mask of flags that can be updated. */ 264#define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \ 265 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \ 266 MNT_NOATIME | \ 267 MNT_NOSYMFOLLOW | MNT_IGNORE | \ 268 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \ 269 MNT_ACLS | MNT_USER) 270 271/* 272 * External filesystem command modifier flags. 273 * Unmount can use the MNT_FORCE flag. 274 * XXX: These are not STATES and really should be somewhere else. 275 * XXX: MNT_BYFSID collides with MNT_ACLS, but because MNT_ACLS is only used for 276 * mount(2) and MNT_BYFSID is only used for unmount(2) it's harmless. 277 */ 278#define MNT_UPDATE 0x00010000 /* not a real mount, just an update */ 279#define MNT_DELEXPORT 0x00020000 /* delete export host lists */ 280#define MNT_RELOAD 0x00040000 /* reload filesystem data */ 281#define MNT_FORCE 0x00080000 /* force unmount or readonly change */ 282#define MNT_SNAPSHOT 0x01000000 /* snapshot the filesystem */ 283#define MNT_BYFSID 0x08000000 /* specify filesystem by ID. */ 284#define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \ 285 MNT_FORCE | MNT_SNAPSHOT | MNT_BYFSID) 286/* 287 * Still available. 288 */ 289#define MNT_SPARE_0x00000010 0x00000010 290#define MNT_SPARE_0x02000000 0x02000000 291/* 292 * Internal filesystem control flags stored in mnt_kern_flag. 293 * 294 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed 295 * past the mount point. This keeps the subtree stable during mounts 296 * and unmounts. 297 * 298 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while 299 * dounmount() is still waiting to lock the mountpoint. This allows 300 * the filesystem to cancel operations that might otherwise deadlock 301 * with the unmount attempt (used by NFS). 302 */ 303#define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */ 304#define MNTK_UNMOUNT 0x01000000 /* unmount in progress */ 305#define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */ 306#define MNTK_SUSPEND 0x08000000 /* request write suspension */ 307#define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */ 308#define MNTK_MPSAFE 0x20000000 /* Filesystem is MPSAFE. */ 309#define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */ 310 311/* 312 * Sysctl CTL_VFS definitions. 313 * 314 * Second level identifier specifies which filesystem. Second level 315 * identifier VFS_VFSCONF returns information about all filesystems. 316 * Second level identifier VFS_GENERIC is non-terminal. 317 */ 318#define VFS_VFSCONF 0 /* get configured filesystems */ 319#define VFS_GENERIC 0 /* generic filesystem information */ 320/* 321 * Third level identifiers for VFS_GENERIC are given below; third 322 * level identifiers for specific filesystems are given in their 323 * mount specific header files. 324 */ 325#define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */ 326#define VFS_CONF 2 /* struct: vfsconf for filesystem given 327 as next argument */ 328 329/* 330 * Flags for various system call interfaces. 331 * 332 * waitfor flags to vfs_sync() and getfsstat() 333 */ 334#define MNT_WAIT 1 /* synchronously wait for I/O to complete */ 335#define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */ 336#define MNT_LAZY 3 /* push data not written by filesystem syncer */ 337#define MNT_SUSPEND 4 /* Suspend file system after sync */ 338 339/* 340 * Generic file handle 341 */ 342struct fhandle { 343 fsid_t fh_fsid; /* Filesystem id of mount point */ 344 struct fid fh_fid; /* Filesys specific id */ 345}; 346typedef struct fhandle fhandle_t; 347 348/* 349 * Export arguments for local filesystem mount calls. 350 */ 351struct export_args { 352 int ex_flags; /* export related flags */ 353 uid_t ex_root; /* mapping for root uid */ 354 struct xucred ex_anon; /* mapping for anonymous user */ 355 struct sockaddr *ex_addr; /* net address to which exported */ 356 u_char ex_addrlen; /* and the net address length */ 357 struct sockaddr *ex_mask; /* mask of valid bits in saddr */ 358 u_char ex_masklen; /* and the smask length */ 359 char *ex_indexfile; /* index file for WebNFS URLs */ 360}; 361 362/* 363 * Structure holding information for a publicly exported filesystem 364 * (WebNFS). Currently the specs allow just for one such filesystem. 365 */ 366struct nfs_public { 367 int np_valid; /* Do we hold valid information */ 368 fhandle_t np_handle; /* Filehandle for pub fs (internal) */ 369 struct mount *np_mount; /* Mountpoint of exported fs */ 370 char *np_index; /* Index file */ 371}; 372 373/* 374 * Filesystem configuration information. One of these exists for each 375 * type of filesystem supported by the kernel. These are searched at 376 * mount time to identify the requested filesystem. 377 * 378 * XXX: Never change the first two arguments! 379 */ 380struct vfsconf { 381 u_int vfc_version; /* ABI version number */ 382 char vfc_name[MFSNAMELEN]; /* filesystem type name */ 383 struct vfsops *vfc_vfsops; /* filesystem operations vector */ 384 int vfc_typenum; /* historic filesystem type number */ 385 int vfc_refcount; /* number mounted of this type */ 386 int vfc_flags; /* permanent flags */ 387 struct vfsoptdecl *vfc_opts; /* mount options */ 388 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */ 389}; 390 391/* Userland version of the struct vfsconf. */ 392struct xvfsconf { 393 struct vfsops *vfc_vfsops; /* filesystem operations vector */ 394 char vfc_name[MFSNAMELEN]; /* filesystem type name */ 395 int vfc_typenum; /* historic filesystem type number */ 396 int vfc_refcount; /* number mounted of this type */ 397 int vfc_flags; /* permanent flags */ 398 struct vfsconf *vfc_next; /* next in list */ 399}; 400 401#ifndef BURN_BRIDGES 402struct ovfsconf { 403 void *vfc_vfsops; 404 char vfc_name[32]; 405 int vfc_index; 406 int vfc_refcount; 407 int vfc_flags; 408}; 409#endif 410 411/* 412 * NB: these flags refer to IMPLEMENTATION properties, not properties of 413 * any actual mounts; i.e., it does not make sense to change the flags. 414 */ 415#define VFCF_STATIC 0x00010000 /* statically compiled into kernel */ 416#define VFCF_NETWORK 0x00020000 /* may get data over the network */ 417#define VFCF_READONLY 0x00040000 /* writes are not implemented */ 418#define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */ 419#define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */ 420#define VFCF_UNICODE 0x00200000 /* stores file names as Unicode*/ 421 422typedef uint32_t fsctlop_t; 423 424struct vfsidctl { 425 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */ 426 fsid_t vc_fsid; /* fsid to operate on. */ 427 char vc_fstypename[MFSNAMELEN]; 428 /* type of fs 'nfs' or '*' */ 429 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */ 430 void *vc_ptr; /* pointer to data structure. */ 431 size_t vc_len; /* sizeof said structure. */ 432 u_int32_t vc_spare[12]; /* spare (must be zero). */ 433}; 434 435/* vfsidctl API version. */ 436#define VFS_CTL_VERS1 0x01 437 438/* 439 * New style VFS sysctls, do not reuse/conflict with the namespace for 440 * private sysctls. 441 * All "global" sysctl ops have the 33rd bit set: 442 * 0x...1.... 443 * Private sysctl ops should have the 33rd bit unset. 444 */ 445#define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */ 446#define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */ 447#define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */ 448 449struct vfsquery { 450 u_int32_t vq_flags; 451 u_int32_t vq_spare[31]; 452}; 453 454/* vfsquery flags */ 455#define VQ_NOTRESP 0x0001 /* server down */ 456#define VQ_NEEDAUTH 0x0002 /* server bad auth */ 457#define VQ_LOWDISK 0x0004 /* we're low on space */ 458#define VQ_MOUNT 0x0008 /* new filesystem arrived */ 459#define VQ_UNMOUNT 0x0010 /* filesystem has left */ 460#define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */ 461#define VQ_ASSIST 0x0040 /* filesystem needs assistance from external 462 program */ 463#define VQ_NOTRESPLOCK 0x0080 /* server lockd down */ 464#define VQ_FLAG0100 0x0100 /* placeholder */ 465#define VQ_FLAG0200 0x0200 /* placeholder */ 466#define VQ_FLAG0400 0x0400 /* placeholder */ 467#define VQ_FLAG0800 0x0800 /* placeholder */ 468#define VQ_FLAG1000 0x1000 /* placeholder */ 469#define VQ_FLAG2000 0x2000 /* placeholder */ 470#define VQ_FLAG4000 0x4000 /* placeholder */ 471#define VQ_FLAG8000 0x8000 /* placeholder */ 472 473#ifdef _KERNEL 474/* Point a sysctl request at a vfsidctl's data. */ 475#define VCTLTOREQ(vc, req) \ 476 do { \ 477 (req)->newptr = (vc)->vc_ptr; \ 478 (req)->newlen = (vc)->vc_len; \ 479 (req)->newidx = 0; \ 480 } while (0) 481#endif 482 483struct iovec; 484struct uio; 485 486#ifdef _KERNEL 487 488#ifdef MALLOC_DECLARE 489MALLOC_DECLARE(M_MOUNT); 490#endif 491extern int maxvfsconf; /* highest defined filesystem type */ 492extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */ 493 494TAILQ_HEAD(vfsconfhead, vfsconf); 495extern struct vfsconfhead vfsconf; 496 497/* 498 * Operations supported on mounted filesystem. 499 */ 500struct mount_args; 501struct nameidata; 502struct sysctl_req; 503struct mntarg; 504 505typedef int vfs_cmount_t(struct mntarg *ma, void *data, int flags, struct thread *td); 506typedef int vfs_unmount_t(struct mount *mp, int mntflags, struct thread *td); 507typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp, 508 struct thread *td); 509typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, 510 void *arg, struct thread *td); 511typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp, 512 struct thread *td); 513typedef int vfs_sync_t(struct mount *mp, int waitfor, struct thread *td); 514typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags, 515 struct vnode **vpp); 516typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp); 517typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam, 518 int *extflagsp, struct ucred **credanonp); 519typedef int vfs_vptofh_t(struct vnode *vp, struct fid *fhp); 520typedef int vfs_init_t(struct vfsconf *); 521typedef int vfs_uninit_t(struct vfsconf *); 522typedef int vfs_extattrctl_t(struct mount *mp, int cmd, 523 struct vnode *filename_vp, int attrnamespace, 524 const char *attrname, struct thread *td); 525typedef int vfs_mount_t(struct mount *mp, struct thread *td); 526typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op, 527 struct sysctl_req *req); 528 529struct vfsops { 530 vfs_mount_t *vfs_mount; 531 vfs_cmount_t *vfs_cmount; 532 vfs_unmount_t *vfs_unmount; 533 vfs_root_t *vfs_root; 534 vfs_quotactl_t *vfs_quotactl; 535 vfs_statfs_t *vfs_statfs; 536 vfs_sync_t *vfs_sync; 537 vfs_vget_t *vfs_vget; 538 vfs_fhtovp_t *vfs_fhtovp; 539 vfs_checkexp_t *vfs_checkexp; 540 vfs_vptofh_t *vfs_vptofh; 541 vfs_init_t *vfs_init; 542 vfs_uninit_t *vfs_uninit; 543 vfs_extattrctl_t *vfs_extattrctl; 544 vfs_sysctl_t *vfs_sysctl; 545}; 546 547vfs_statfs_t __vfs_statfs; 548 549#define VFS_MOUNT(MP, P) (*(MP)->mnt_op->vfs_mount)(MP, P) 550#define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P) 551#define VFS_ROOT(MP, FLAGS, VPP, P) \ 552 (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP, P) 553#define VFS_QUOTACTL(MP,C,U,A,P) (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P) 554#define VFS_STATFS(MP, SBP, P) __vfs_statfs((MP), (SBP), (P)) 555#define VFS_SYNC(MP, WAIT, P) (*(MP)->mnt_op->vfs_sync)(MP, WAIT, P) 556#define VFS_VGET(MP, INO, FLAGS, VPP) \ 557 (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP) 558#define VFS_FHTOVP(MP, FIDP, VPP) \ 559 (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP) 560#define VFS_VPTOFH(VP, FIDP) (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP) 561#define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \ 562 (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED) 563#define VFS_EXTATTRCTL(MP, C, FN, NS, N, P) \ 564 (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N, P) 565#define VFS_SYSCTL(MP, OP, REQ) \ 566 (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ) 567 568extern int mpsafe_vfs; 569 570#define VFS_NEEDSGIANT(MP) \ 571 (!mpsafe_vfs || ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0)) 572 573#define VFS_LOCK_GIANT(MP) __extension__ \ 574({ \ 575 int _locked; \ 576 if (VFS_NEEDSGIANT((MP))) { \ 577 mtx_lock(&Giant); \ 578 _locked = 1; \ 579 } else \ 580 _locked = 0; \ 581 _locked; \ 582}) 583#define VFS_UNLOCK_GIANT(locked) if ((locked)) mtx_unlock(&Giant); 584#define VFS_ASSERT_GIANT(MP) do \ 585{ \ 586 if (VFS_NEEDSGIANT((MP))) \ 587 mtx_assert(&Giant, MA_OWNED); \ 588} while (0) 589 590#define VFS_KNOTE_LOCKED(vp, hint) do \ 591{ \ 592 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \ 593 VN_KNOTE((vp), (hint), 1); \ 594} while (0) 595 596#define VFS_KNOTE_UNLOCKED(vp, hint) do \ 597{ \ 598 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \ 599 VN_KNOTE((vp), (hint), 0); \ 600} while (0) 601 602#include <sys/module.h> 603 604/* 605 * Version numbers. 606 */ 607#define VFS_VERSION_00 0x19660120 608#define VFS_VERSION VFS_VERSION_00 609 610#define VFS_SET(vfsops, fsname, flags) \ 611 static struct vfsconf fsname ## _vfsconf = { \ 612 .vfc_version = VFS_VERSION, \ 613 .vfc_name = #fsname, \ 614 .vfc_vfsops = &vfsops, \ 615 .vfc_typenum = -1, \ 616 .vfc_flags = flags, \ 617 }; \ 618 static moduledata_t fsname ## _mod = { \ 619 #fsname, \ 620 vfs_modevent, \ 621 & fsname ## _vfsconf \ 622 }; \ 623 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE) 624 625extern char *mountrootfsname; 626 627/* 628 * exported vnode operations 629 */ 630 631int dounmount(struct mount *, int, struct thread *); 632 633int kernel_mount(struct mntarg *ma, int flags); 634int kernel_vmount(int flags, ...); 635struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len); 636struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name); 637struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...); 638struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len); 639struct vfsconf *vfs_byname(const char *); 640struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *); 641void vfs_event_signal(fsid_t *, u_int32_t, intptr_t); 642int vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val); 643int vfs_getopt(struct vfsoptlist *, const char *, void **, int *); 644char *vfs_getopts(struct vfsoptlist *, const char *, int *error); 645int vfs_copyopt(struct vfsoptlist *, const char *, void *, int); 646int vfs_filteropt(struct vfsoptlist *, const char **legal); 647int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...); 648int vfs_setpublicfs /* set publicly exported fs */ 649 (struct mount *, struct netexport *, struct export_args *); 650void vfs_msync(struct mount *, int); 651int vfs_busy(struct mount *, int, struct mtx *, struct thread *); 652int vfs_export /* process mount export info */ 653 (struct mount *, struct export_args *); 654int vfs_allocate_syncvnode(struct mount *); 655void vfs_getnewfsid(struct mount *); 656struct cdev *vfs_getrootfsid(struct mount *); 657struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */ 658int vfs_modevent(module_t, int, void *); 659void vfs_mount_error(struct mount *, const char *, ...); 660void vfs_mountroot(void); /* mount our root filesystem */ 661void vfs_mountedfrom(struct mount *, const char *from); 662void vfs_ref(struct mount *); 663void vfs_rel(struct mount *); 664int vfs_suser(struct mount *, struct thread *); 665void vfs_unbusy(struct mount *, struct thread *); 666void vfs_unmountall(void); 667extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */ 668extern struct mtx mountlist_mtx; 669extern struct nfs_public nfs_pub; 670 671/* 672 * Declarations for these vfs default operations are located in 673 * kern/vfs_default.c, they should be used instead of making "dummy" 674 * functions or casting entries in the VFS op table to "enopnotsupp()". 675 */ 676vfs_root_t vfs_stdroot; 677vfs_quotactl_t vfs_stdquotactl; 678vfs_statfs_t vfs_stdstatfs; 679vfs_sync_t vfs_stdsync; 680vfs_sync_t vfs_stdnosync; 681vfs_vget_t vfs_stdvget; 682vfs_fhtovp_t vfs_stdfhtovp; 683vfs_checkexp_t vfs_stdcheckexp; 684vfs_vptofh_t vfs_stdvptofh; 685vfs_init_t vfs_stdinit; 686vfs_uninit_t vfs_stduninit; 687vfs_extattrctl_t vfs_stdextattrctl; 688vfs_sysctl_t vfs_stdsysctl; 689 690#else /* !_KERNEL */ 691 692#include <sys/cdefs.h> 693 694struct stat; 695 696__BEGIN_DECLS 697int fhopen(const struct fhandle *, int); 698int fhstat(const struct fhandle *, struct stat *); 699int fhstatfs(const struct fhandle *, struct statfs *); 700int fstatfs(int, struct statfs *); 701int getfh(const char *, fhandle_t *); 702int getfsstat(struct statfs *, long, int); 703int getmntinfo(struct statfs **, int); 704int lgetfh(const char *, fhandle_t *); 705int mount(const char *, const char *, int, void *); 706int nmount(struct iovec *, unsigned int, int); 707int statfs(const char *, struct statfs *); 708int unmount(const char *, int); 709 710/* C library stuff */ 711int getvfsbyname(const char *, struct xvfsconf *); 712__END_DECLS 713 714#endif /* _KERNEL */ 715 716#endif /* !_SYS_MOUNT_H_ */ 717