mount.h revision 154152
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 154152 2006-01-09 20:42:19Z 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 */ 138struct mount { 139 TAILQ_ENTRY(mount) mnt_list; /* mount list */ 140 struct vfsops *mnt_op; /* operations on fs */ 141 struct vfsconf *mnt_vfc; /* configuration info */ 142 struct vnode *mnt_vnodecovered; /* vnode we mounted on */ 143 struct vnode *mnt_syncer; /* syncer vnode */ 144 struct vnodelst mnt_nvnodelist; /* list of vnodes this mount */ 145 struct lock mnt_lock; /* mount structure lock */ 146 struct mtx mnt_mtx; /* mount structure interlock */ 147 int mnt_writeopcount; /* write syscalls in progress */ 148 u_int mnt_flag; /* flags shared with user */ 149 struct vfsoptlist *mnt_opt; /* current mount options */ 150 struct vfsoptlist *mnt_optnew; /* new options passed to fs */ 151 int mnt_kern_flag; /* kernel only flags */ 152 int mnt_maxsymlinklen; /* max size of short symlink */ 153 struct statfs mnt_stat; /* cache of filesystem stats */ 154 struct ucred *mnt_cred; /* credentials of mounter */ 155 void * mnt_data; /* private data */ 156 time_t mnt_time; /* last time written*/ 157 int mnt_iosize_max; /* max size for clusters, etc */ 158 struct netexport *mnt_export; /* export list */ 159 struct label *mnt_mntlabel; /* MAC label for the mount */ 160 struct label *mnt_fslabel; /* MAC label for the fs */ 161 int mnt_nvnodelistsize; /* # of vnodes on this mount */ 162 u_int mnt_hashseed; /* Random seed for vfs_hash */ 163 int mnt_markercnt; /* marker vnodes in use */ 164 int mnt_holdcnt; /* hold count */ 165 int mnt_holdcntwaiters; /* waits on hold count */ 166}; 167 168struct vnode *__mnt_vnode_next(struct vnode **mvp, struct mount *mp); 169struct vnode *__mnt_vnode_first(struct vnode **mvp, struct mount *mp); 170void __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp); 171 172#define MNT_VNODE_FOREACH(vp, mp, mvp) \ 173 for (vp = __mnt_vnode_first(&(mvp), (mp)); \ 174 (vp) != NULL; vp = __mnt_vnode_next(&(mvp), (mp))) 175 176#define MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp) \ 177 __mnt_vnode_markerfree(&(mvp), (mp)) 178 179#define MNT_VNODE_FOREACH_ABORT(mp, mvp) \ 180 do { \ 181 MNT_ILOCK(mp); \ 182 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); \ 183 MNT_IUNLOCK(mp); \ 184 } while (0) 185 186#define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx) 187#define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx) 188#define MNT_MTX(mp) (&(mp)->mnt_mtx) 189 190#endif /* _KERNEL */ 191 192/* 193 * User specifiable flags. 194 */ 195#define MNT_RDONLY 0x00000001 /* read only filesystem */ 196#define MNT_SYNCHRONOUS 0x00000002 /* filesystem written synchronously */ 197#define MNT_NOEXEC 0x00000004 /* can't exec from filesystem */ 198#define MNT_NOSUID 0x00000008 /* don't honor setuid bits on fs */ 199#define MNT_UNION 0x00000020 /* union with underlying filesystem */ 200#define MNT_ASYNC 0x00000040 /* filesystem written asynchronously */ 201#define MNT_SUIDDIR 0x00100000 /* special handling of SUID on dirs */ 202#define MNT_SOFTDEP 0x00200000 /* soft updates being done */ 203#define MNT_NOSYMFOLLOW 0x00400000 /* do not follow symlinks */ 204#define MNT_MULTILABEL 0x04000000 /* MAC support for individual objects */ 205#define MNT_ACLS 0x08000000 /* ACL support enabled */ 206#define MNT_NOATIME 0x10000000 /* disable update of file access time */ 207#define MNT_NOCLUSTERR 0x40000000 /* disable cluster read */ 208#define MNT_NOCLUSTERW 0x80000000 /* disable cluster write */ 209 210/* 211 * NFS export related mount flags. 212 */ 213#define MNT_EXRDONLY 0x00000080 /* exported read only */ 214#define MNT_EXPORTED 0x00000100 /* filesystem is exported */ 215#define MNT_DEFEXPORTED 0x00000200 /* exported to the world */ 216#define MNT_EXPORTANON 0x00000400 /* use anon uid mapping for everyone */ 217#define MNT_EXKERB 0x00000800 /* exported with Kerberos uid mapping */ 218#define MNT_EXPUBLIC 0x20000000 /* public export (WebNFS) */ 219 220/* 221 * Flags set by internal operations, 222 * but visible to the user. 223 * XXX some of these are not quite right.. (I've never seen the root flag set) 224 */ 225#define MNT_LOCAL 0x00001000 /* filesystem is stored locally */ 226#define MNT_QUOTA 0x00002000 /* quotas are enabled on filesystem */ 227#define MNT_ROOTFS 0x00004000 /* identifies the root filesystem */ 228#define MNT_USER 0x00008000 /* mounted by a user */ 229#define MNT_IGNORE 0x00800000 /* do not show entry in df */ 230 231/* 232 * Mask of flags that are visible to statfs(). 233 * XXX I think that this could now become (~(MNT_CMDFLAGS)) 234 * but the 'mount' program may need changing to handle this. 235 */ 236#define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \ 237 MNT_NOSUID | MNT_UNION | \ 238 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \ 239 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \ 240 MNT_LOCAL | MNT_USER | MNT_QUOTA | \ 241 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \ 242 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \ 243 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \ 244 MNT_MULTILABEL | MNT_ACLS) 245 246/* Mask of flags that can be updated. */ 247#define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \ 248 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \ 249 MNT_NOATIME | \ 250 MNT_NOSYMFOLLOW | MNT_IGNORE | \ 251 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \ 252 MNT_ACLS | MNT_USER) 253 254/* 255 * External filesystem command modifier flags. 256 * Unmount can use the MNT_FORCE flag. 257 * XXX: These are not STATES and really should be somewhere else. 258 * XXX: MNT_BYFSID collides with MNT_ACLS, but because MNT_ACLS is only used for 259 * mount(2) and MNT_BYFSID is only used for unmount(2) it's harmless. 260 */ 261#define MNT_UPDATE 0x00010000 /* not a real mount, just an update */ 262#define MNT_DELEXPORT 0x00020000 /* delete export host lists */ 263#define MNT_RELOAD 0x00040000 /* reload filesystem data */ 264#define MNT_FORCE 0x00080000 /* force unmount or readonly change */ 265#define MNT_SNAPSHOT 0x01000000 /* snapshot the filesystem */ 266#define MNT_BYFSID 0x08000000 /* specify filesystem by ID. */ 267#define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \ 268 MNT_FORCE | MNT_SNAPSHOT | MNT_BYFSID) 269/* 270 * Still available. 271 */ 272#define MNT_SPARE_0x00000010 0x00000010 273#define MNT_SPARE_0x02000000 0x02000000 274/* 275 * Internal filesystem control flags stored in mnt_kern_flag. 276 * 277 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed 278 * past the mount point. This keeps the subtree stable during mounts 279 * and unmounts. 280 * 281 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while 282 * dounmount() is still waiting to lock the mountpoint. This allows 283 * the filesystem to cancel operations that might otherwise deadlock 284 * with the unmount attempt (used by NFS). 285 */ 286#define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */ 287#define MNTK_UNMOUNT 0x01000000 /* unmount in progress */ 288#define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */ 289#define MNTK_SUSPEND 0x08000000 /* request write suspension */ 290#define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */ 291#define MNTK_MPSAFE 0x20000000 /* Filesystem is MPSAFE. */ 292#define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */ 293 294/* 295 * Sysctl CTL_VFS definitions. 296 * 297 * Second level identifier specifies which filesystem. Second level 298 * identifier VFS_VFSCONF returns information about all filesystems. 299 * Second level identifier VFS_GENERIC is non-terminal. 300 */ 301#define VFS_VFSCONF 0 /* get configured filesystems */ 302#define VFS_GENERIC 0 /* generic filesystem information */ 303/* 304 * Third level identifiers for VFS_GENERIC are given below; third 305 * level identifiers for specific filesystems are given in their 306 * mount specific header files. 307 */ 308#define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */ 309#define VFS_CONF 2 /* struct: vfsconf for filesystem given 310 as next argument */ 311 312/* 313 * Flags for various system call interfaces. 314 * 315 * waitfor flags to vfs_sync() and getfsstat() 316 */ 317#define MNT_WAIT 1 /* synchronously wait for I/O to complete */ 318#define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */ 319#define MNT_LAZY 3 /* push data not written by filesystem syncer */ 320 321/* 322 * Generic file handle 323 */ 324struct fhandle { 325 fsid_t fh_fsid; /* Filesystem id of mount point */ 326 struct fid fh_fid; /* Filesys specific id */ 327}; 328typedef struct fhandle fhandle_t; 329 330/* 331 * Export arguments for local filesystem mount calls. 332 */ 333struct export_args { 334 int ex_flags; /* export related flags */ 335 uid_t ex_root; /* mapping for root uid */ 336 struct xucred ex_anon; /* mapping for anonymous user */ 337 struct sockaddr *ex_addr; /* net address to which exported */ 338 u_char ex_addrlen; /* and the net address length */ 339 struct sockaddr *ex_mask; /* mask of valid bits in saddr */ 340 u_char ex_masklen; /* and the smask length */ 341 char *ex_indexfile; /* index file for WebNFS URLs */ 342}; 343 344/* 345 * Structure holding information for a publicly exported filesystem 346 * (WebNFS). Currently the specs allow just for one such filesystem. 347 */ 348struct nfs_public { 349 int np_valid; /* Do we hold valid information */ 350 fhandle_t np_handle; /* Filehandle for pub fs (internal) */ 351 struct mount *np_mount; /* Mountpoint of exported fs */ 352 char *np_index; /* Index file */ 353}; 354 355/* 356 * Filesystem configuration information. One of these exists for each 357 * type of filesystem supported by the kernel. These are searched at 358 * mount time to identify the requested filesystem. 359 * 360 * XXX: Never change the first two arguments! 361 */ 362struct vfsconf { 363 u_int vfc_version; /* ABI version number */ 364 char vfc_name[MFSNAMELEN]; /* filesystem type name */ 365 struct vfsops *vfc_vfsops; /* filesystem operations vector */ 366 int vfc_typenum; /* historic filesystem type number */ 367 int vfc_refcount; /* number mounted of this type */ 368 int vfc_flags; /* permanent flags */ 369 struct vfsoptdecl *vfc_opts; /* mount options */ 370 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */ 371}; 372 373/* Userland version of the struct vfsconf. */ 374struct xvfsconf { 375 struct vfsops *vfc_vfsops; /* filesystem operations vector */ 376 char vfc_name[MFSNAMELEN]; /* filesystem type name */ 377 int vfc_typenum; /* historic filesystem type number */ 378 int vfc_refcount; /* number mounted of this type */ 379 int vfc_flags; /* permanent flags */ 380 struct vfsconf *vfc_next; /* next in list */ 381}; 382 383#ifndef BURN_BRIDGES 384struct ovfsconf { 385 void *vfc_vfsops; 386 char vfc_name[32]; 387 int vfc_index; 388 int vfc_refcount; 389 int vfc_flags; 390}; 391#endif 392 393/* 394 * NB: these flags refer to IMPLEMENTATION properties, not properties of 395 * any actual mounts; i.e., it does not make sense to change the flags. 396 */ 397#define VFCF_STATIC 0x00010000 /* statically compiled into kernel */ 398#define VFCF_NETWORK 0x00020000 /* may get data over the network */ 399#define VFCF_READONLY 0x00040000 /* writes are not implemented */ 400#define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */ 401#define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */ 402#define VFCF_UNICODE 0x00200000 /* stores file names as Unicode*/ 403 404typedef uint32_t fsctlop_t; 405 406struct vfsidctl { 407 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */ 408 fsid_t vc_fsid; /* fsid to operate on. */ 409 char vc_fstypename[MFSNAMELEN]; 410 /* type of fs 'nfs' or '*' */ 411 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */ 412 void *vc_ptr; /* pointer to data structure. */ 413 size_t vc_len; /* sizeof said structure. */ 414 u_int32_t vc_spare[12]; /* spare (must be zero). */ 415}; 416 417/* vfsidctl API version. */ 418#define VFS_CTL_VERS1 0x01 419 420/* 421 * New style VFS sysctls, do not reuse/conflict with the namespace for 422 * private sysctls. 423 * All "global" sysctl ops have the 33rd bit set: 424 * 0x...1.... 425 * Private sysctl ops should have the 33rd bit unset. 426 */ 427#define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */ 428#define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */ 429#define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */ 430 431struct vfsquery { 432 u_int32_t vq_flags; 433 u_int32_t vq_spare[31]; 434}; 435 436/* vfsquery flags */ 437#define VQ_NOTRESP 0x0001 /* server down */ 438#define VQ_NEEDAUTH 0x0002 /* server bad auth */ 439#define VQ_LOWDISK 0x0004 /* we're low on space */ 440#define VQ_MOUNT 0x0008 /* new filesystem arrived */ 441#define VQ_UNMOUNT 0x0010 /* filesystem has left */ 442#define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */ 443#define VQ_ASSIST 0x0040 /* filesystem needs assistance from external 444 program */ 445#define VQ_NOTRESPLOCK 0x0080 /* server lockd down */ 446#define VQ_FLAG0100 0x0100 /* placeholder */ 447#define VQ_FLAG0200 0x0200 /* placeholder */ 448#define VQ_FLAG0400 0x0400 /* placeholder */ 449#define VQ_FLAG0800 0x0800 /* placeholder */ 450#define VQ_FLAG1000 0x1000 /* placeholder */ 451#define VQ_FLAG2000 0x2000 /* placeholder */ 452#define VQ_FLAG4000 0x4000 /* placeholder */ 453#define VQ_FLAG8000 0x8000 /* placeholder */ 454 455#ifdef _KERNEL 456/* Point a sysctl request at a vfsidctl's data. */ 457#define VCTLTOREQ(vc, req) \ 458 do { \ 459 (req)->newptr = (vc)->vc_ptr; \ 460 (req)->newlen = (vc)->vc_len; \ 461 (req)->newidx = 0; \ 462 } while (0) 463#endif 464 465struct iovec; 466struct uio; 467 468#ifdef _KERNEL 469 470#ifdef MALLOC_DECLARE 471MALLOC_DECLARE(M_MOUNT); 472#endif 473extern int maxvfsconf; /* highest defined filesystem type */ 474extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */ 475 476TAILQ_HEAD(vfsconfhead, vfsconf); 477extern struct vfsconfhead vfsconf; 478 479/* 480 * Operations supported on mounted filesystem. 481 */ 482struct mount_args; 483struct nameidata; 484struct sysctl_req; 485struct mntarg; 486 487typedef int vfs_cmount_t(struct mntarg *ma, void *data, int flags, struct thread *td); 488typedef int vfs_unmount_t(struct mount *mp, int mntflags, struct thread *td); 489typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp, 490 struct thread *td); 491typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, 492 void *arg, struct thread *td); 493typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp, 494 struct thread *td); 495typedef int vfs_sync_t(struct mount *mp, int waitfor, struct thread *td); 496typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags, 497 struct vnode **vpp); 498typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp); 499typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam, 500 int *extflagsp, struct ucred **credanonp); 501typedef int vfs_vptofh_t(struct vnode *vp, struct fid *fhp); 502typedef int vfs_init_t(struct vfsconf *); 503typedef int vfs_uninit_t(struct vfsconf *); 504typedef int vfs_extattrctl_t(struct mount *mp, int cmd, 505 struct vnode *filename_vp, int attrnamespace, 506 const char *attrname, struct thread *td); 507typedef int vfs_mount_t(struct mount *mp, struct thread *td); 508typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op, 509 struct sysctl_req *req); 510 511struct vfsops { 512 vfs_mount_t *vfs_mount; 513 vfs_cmount_t *vfs_cmount; 514 vfs_unmount_t *vfs_unmount; 515 vfs_root_t *vfs_root; 516 vfs_quotactl_t *vfs_quotactl; 517 vfs_statfs_t *vfs_statfs; 518 vfs_sync_t *vfs_sync; 519 vfs_vget_t *vfs_vget; 520 vfs_fhtovp_t *vfs_fhtovp; 521 vfs_checkexp_t *vfs_checkexp; 522 vfs_vptofh_t *vfs_vptofh; 523 vfs_init_t *vfs_init; 524 vfs_uninit_t *vfs_uninit; 525 vfs_extattrctl_t *vfs_extattrctl; 526 vfs_sysctl_t *vfs_sysctl; 527}; 528 529vfs_statfs_t __vfs_statfs; 530 531#define VFS_MOUNT(MP, P) (*(MP)->mnt_op->vfs_mount)(MP, P) 532#define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P) 533#define VFS_ROOT(MP, FLAGS, VPP, P) \ 534 (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP, P) 535#define VFS_QUOTACTL(MP,C,U,A,P) (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P) 536#define VFS_STATFS(MP, SBP, P) __vfs_statfs((MP), (SBP), (P)) 537#define VFS_SYNC(MP, WAIT, P) (*(MP)->mnt_op->vfs_sync)(MP, WAIT, P) 538#define VFS_VGET(MP, INO, FLAGS, VPP) \ 539 (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP) 540#define VFS_FHTOVP(MP, FIDP, VPP) \ 541 (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP) 542#define VFS_VPTOFH(VP, FIDP) (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP) 543#define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \ 544 (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED) 545#define VFS_EXTATTRCTL(MP, C, FN, NS, N, P) \ 546 (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N, P) 547#define VFS_SYSCTL(MP, OP, REQ) \ 548 (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ) 549 550extern int mpsafe_vfs; 551 552#define VFS_NEEDSGIANT(MP) \ 553 (!mpsafe_vfs || ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0)) 554 555#define VFS_LOCK_GIANT(MP) __extension__ \ 556({ \ 557 int _locked; \ 558 if (VFS_NEEDSGIANT((MP))) { \ 559 mtx_lock(&Giant); \ 560 _locked = 1; \ 561 } else \ 562 _locked = 0; \ 563 _locked; \ 564}) 565#define VFS_UNLOCK_GIANT(locked) if ((locked)) mtx_unlock(&Giant); 566#define VFS_ASSERT_GIANT(MP) do \ 567{ \ 568 if (VFS_NEEDSGIANT((MP))) \ 569 mtx_assert(&Giant, MA_OWNED); \ 570} while (0) 571 572#define VFS_KNOTE_LOCKED(vp, hint) do \ 573{ \ 574 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \ 575 VN_KNOTE((vp), (hint), 1); \ 576} while (0) 577 578#define VFS_KNOTE_UNLOCKED(vp, hint) do \ 579{ \ 580 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \ 581 VN_KNOTE((vp), (hint), 0); \ 582} while (0) 583 584#include <sys/module.h> 585 586/* 587 * Version numbers. 588 */ 589#define VFS_VERSION_00 0x19660120 590#define VFS_VERSION VFS_VERSION_00 591 592#define VFS_SET(vfsops, fsname, flags) \ 593 static struct vfsconf fsname ## _vfsconf = { \ 594 .vfc_version = VFS_VERSION, \ 595 .vfc_name = #fsname, \ 596 .vfc_vfsops = &vfsops, \ 597 .vfc_typenum = -1, \ 598 .vfc_flags = flags, \ 599 }; \ 600 static moduledata_t fsname ## _mod = { \ 601 #fsname, \ 602 vfs_modevent, \ 603 & fsname ## _vfsconf \ 604 }; \ 605 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE) 606 607extern char *mountrootfsname; 608 609/* 610 * exported vnode operations 611 */ 612 613int dounmount(struct mount *, int, struct thread *); 614 615int kernel_mount(struct mntarg *ma, int flags); 616int kernel_vmount(int flags, ...); 617struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len); 618struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name); 619struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...); 620struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len); 621struct vfsconf *vfs_byname(const char *); 622struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *); 623void vfs_event_signal(fsid_t *, u_int32_t, intptr_t); 624int vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val); 625int vfs_getopt(struct vfsoptlist *, const char *, void **, int *); 626char *vfs_getopts(struct vfsoptlist *, const char *, int *error); 627int vfs_copyopt(struct vfsoptlist *, const char *, void *, int); 628int vfs_filteropt(struct vfsoptlist *, const char **legal); 629int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...); 630int vfs_setpublicfs /* set publicly exported fs */ 631 (struct mount *, struct netexport *, struct export_args *); 632int vfs_lock(struct mount *); /* lock a vfs */ 633void vfs_msync(struct mount *, int); 634void vfs_unlock(struct mount *); /* unlock a vfs */ 635int vfs_busy(struct mount *, int, struct mtx *, struct thread *); 636int vfs_export /* process mount export info */ 637 (struct mount *, struct export_args *); 638int vfs_allocate_syncvnode(struct mount *); 639void vfs_getnewfsid(struct mount *); 640struct cdev *vfs_getrootfsid(struct mount *); 641struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */ 642int vfs_modevent(module_t, int, void *); 643void vfs_mount_error(struct mount *, const char *, ...); 644void vfs_mountroot(void); /* mount our root filesystem */ 645void vfs_mountedfrom(struct mount *, const char *from); 646int vfs_suser(struct mount *, struct thread *); 647void vfs_unbusy(struct mount *, struct thread *); 648void vfs_unmountall(void); 649extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */ 650extern struct mtx mountlist_mtx; 651extern struct nfs_public nfs_pub; 652 653/* 654 * Declarations for these vfs default operations are located in 655 * kern/vfs_default.c, they should be used instead of making "dummy" 656 * functions or casting entries in the VFS op table to "enopnotsupp()". 657 */ 658vfs_root_t vfs_stdroot; 659vfs_quotactl_t vfs_stdquotactl; 660vfs_statfs_t vfs_stdstatfs; 661vfs_sync_t vfs_stdsync; 662vfs_sync_t vfs_stdnosync; 663vfs_vget_t vfs_stdvget; 664vfs_fhtovp_t vfs_stdfhtovp; 665vfs_checkexp_t vfs_stdcheckexp; 666vfs_vptofh_t vfs_stdvptofh; 667vfs_init_t vfs_stdinit; 668vfs_uninit_t vfs_stduninit; 669vfs_extattrctl_t vfs_stdextattrctl; 670vfs_sysctl_t vfs_stdsysctl; 671 672/* XXX - these should be indirect functions!!! */ 673int softdep_fsync(struct vnode *); 674int softdep_process_worklist(struct mount *); 675 676#else /* !_KERNEL */ 677 678#include <sys/cdefs.h> 679 680struct stat; 681 682__BEGIN_DECLS 683int fhopen(const struct fhandle *, int); 684int fhstat(const struct fhandle *, struct stat *); 685int fhstatfs(const struct fhandle *, struct statfs *); 686int fstatfs(int, struct statfs *); 687int getfh(const char *, fhandle_t *); 688int getfsstat(struct statfs *, long, int); 689int getmntinfo(struct statfs **, int); 690int lgetfh(const char *, fhandle_t *); 691int mount(const char *, const char *, int, void *); 692int nmount(struct iovec *, unsigned int, int); 693int statfs(const char *, struct statfs *); 694int unmount(const char *, int); 695 696/* C library stuff */ 697int getvfsbyname(const char *, struct xvfsconf *); 698__END_DECLS 699 700#endif /* _KERNEL */ 701 702#endif /* !_SYS_MOUNT_H_ */ 703