mount.h revision 163839
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 163839 2006-10-31 21:38:51Z pjd $ 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 struct lock mnt_lock; /* mount structure lock */ 147 struct mtx mnt_mtx; /* mount structure interlock */ 148 int mnt_gen; /* struct mount generation */ 149#define mnt_startzero mnt_list 150 TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */ 151 struct vfsops *mnt_op; /* operations on fs */ 152 struct vfsconf *mnt_vfc; /* configuration info */ 153 struct vnode *mnt_vnodecovered; /* vnode we mounted on */ 154 struct vnode *mnt_syncer; /* syncer vnode */ 155 int mnt_ref; /* (i) Reference count */ 156 struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */ 157 int mnt_nvnodelistsize; /* (i) # of vnodes */ 158 int mnt_writeopcount; /* (i) write syscalls pending */ 159 int mnt_kern_flag; /* (i) kernel only flags */ 160 u_int mnt_flag; /* (i) flags shared with user */ 161 u_int mnt_noasync; /* (i) # noasync overrides */ 162 struct vfsoptlist *mnt_opt; /* current mount options */ 163 struct vfsoptlist *mnt_optnew; /* new options passed to fs */ 164 int mnt_maxsymlinklen; /* max size of short symlink */ 165 struct statfs mnt_stat; /* cache of filesystem stats */ 166 struct ucred *mnt_cred; /* credentials of mounter */ 167 void * mnt_data; /* private data */ 168 time_t mnt_time; /* last time written*/ 169 int mnt_iosize_max; /* max size for clusters, etc */ 170 struct netexport *mnt_export; /* export list */ 171 struct label *mnt_mntlabel; /* MAC label for the mount */ 172 struct label *mnt_fslabel; /* MAC label for the fs */ 173 u_int mnt_hashseed; /* Random seed for vfs_hash */ 174 int mnt_markercnt; /* marker vnodes in use */ 175 int mnt_holdcnt; /* hold count */ 176 int mnt_holdcntwaiters; /* waits on hold count */ 177 int mnt_secondary_writes; /* (i) # of secondary writes */ 178 int mnt_secondary_accwrites;/* (i) secondary wr. starts */ 179#define mnt_endzero mnt_gjprovider 180 char *mnt_gjprovider; /* gjournal provider name */ 181}; 182 183struct vnode *__mnt_vnode_next(struct vnode **mvp, struct mount *mp); 184struct vnode *__mnt_vnode_first(struct vnode **mvp, struct mount *mp); 185void __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp); 186 187#define MNT_VNODE_FOREACH(vp, mp, mvp) \ 188 for (vp = __mnt_vnode_first(&(mvp), (mp)); \ 189 (vp) != NULL; vp = __mnt_vnode_next(&(mvp), (mp))) 190 191#define MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp) \ 192 __mnt_vnode_markerfree(&(mvp), (mp)) 193 194#define MNT_VNODE_FOREACH_ABORT(mp, mvp) \ 195 do { \ 196 MNT_ILOCK(mp); \ 197 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); \ 198 MNT_IUNLOCK(mp); \ 199 } while (0) 200 201#define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx) 202#define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx) 203#define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx) 204#define MNT_MTX(mp) (&(mp)->mnt_mtx) 205#define MNT_REF(mp) (mp)->mnt_ref++ 206#define MNT_REL(mp) do { \ 207 (mp)->mnt_ref--; \ 208 if ((mp)->mnt_ref == 0) \ 209 wakeup((mp)); \ 210} while (0) 211 212#endif /* _KERNEL */ 213 214/* 215 * User specifiable flags. 216 */ 217#define MNT_RDONLY 0x00000001 /* read only filesystem */ 218#define MNT_SYNCHRONOUS 0x00000002 /* filesystem written synchronously */ 219#define MNT_NOEXEC 0x00000004 /* can't exec from filesystem */ 220#define MNT_NOSUID 0x00000008 /* don't honor setuid bits on fs */ 221#define MNT_UNION 0x00000020 /* union with underlying filesystem */ 222#define MNT_ASYNC 0x00000040 /* filesystem written asynchronously */ 223#define MNT_SUIDDIR 0x00100000 /* special handling of SUID on dirs */ 224#define MNT_SOFTDEP 0x00200000 /* soft updates being done */ 225#define MNT_NOSYMFOLLOW 0x00400000 /* do not follow symlinks */ 226#define MNT_GJOURNAL 0x02000000 /* GEOM journal support enabled */ 227#define MNT_MULTILABEL 0x04000000 /* MAC support for individual objects */ 228#define MNT_ACLS 0x08000000 /* ACL support enabled */ 229#define MNT_NOATIME 0x10000000 /* disable update of file access time */ 230#define MNT_NOCLUSTERR 0x40000000 /* disable cluster read */ 231#define MNT_NOCLUSTERW 0x80000000 /* disable cluster write */ 232 233/* 234 * NFS export related mount flags. 235 */ 236#define MNT_EXRDONLY 0x00000080 /* exported read only */ 237#define MNT_EXPORTED 0x00000100 /* filesystem is exported */ 238#define MNT_DEFEXPORTED 0x00000200 /* exported to the world */ 239#define MNT_EXPORTANON 0x00000400 /* use anon uid mapping for everyone */ 240#define MNT_EXKERB 0x00000800 /* exported with Kerberos uid mapping */ 241#define MNT_EXPUBLIC 0x20000000 /* public export (WebNFS) */ 242 243/* 244 * Flags set by internal operations, 245 * but visible to the user. 246 * XXX some of these are not quite right.. (I've never seen the root flag set) 247 */ 248#define MNT_LOCAL 0x00001000 /* filesystem is stored locally */ 249#define MNT_QUOTA 0x00002000 /* quotas are enabled on filesystem */ 250#define MNT_ROOTFS 0x00004000 /* identifies the root filesystem */ 251#define MNT_USER 0x00008000 /* mounted by a user */ 252#define MNT_IGNORE 0x00800000 /* do not show entry in df */ 253 254/* 255 * Mask of flags that are visible to statfs(). 256 * XXX I think that this could now become (~(MNT_CMDFLAGS)) 257 * but the 'mount' program may need changing to handle this. 258 */ 259#define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \ 260 MNT_NOSUID | MNT_UNION | \ 261 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \ 262 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \ 263 MNT_LOCAL | MNT_USER | MNT_QUOTA | \ 264 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \ 265 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \ 266 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \ 267 MNT_GJOURNAL | MNT_MULTILABEL | MNT_ACLS) 268 269/* Mask of flags that can be updated. */ 270#define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \ 271 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \ 272 MNT_NOATIME | \ 273 MNT_NOSYMFOLLOW | MNT_IGNORE | \ 274 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \ 275 MNT_ACLS | MNT_USER) 276 277/* 278 * External filesystem command modifier flags. 279 * Unmount can use the MNT_FORCE flag. 280 * XXX: These are not STATES and really should be somewhere else. 281 * XXX: MNT_BYFSID collides with MNT_ACLS, but because MNT_ACLS is only used for 282 * mount(2) and MNT_BYFSID is only used for unmount(2) it's harmless. 283 */ 284#define MNT_UPDATE 0x00010000 /* not a real mount, just an update */ 285#define MNT_DELEXPORT 0x00020000 /* delete export host lists */ 286#define MNT_RELOAD 0x00040000 /* reload filesystem data */ 287#define MNT_FORCE 0x00080000 /* force unmount or readonly change */ 288#define MNT_SNAPSHOT 0x01000000 /* snapshot the filesystem */ 289#define MNT_BYFSID 0x08000000 /* specify filesystem by ID. */ 290#define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \ 291 MNT_FORCE | MNT_SNAPSHOT | MNT_BYFSID) 292/* 293 * Still available. 294 */ 295#define MNT_SPARE_0x00000010 0x00000010 296/* 297 * Internal filesystem control flags stored in mnt_kern_flag. 298 * 299 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed 300 * past the mount point. This keeps the subtree stable during mounts 301 * and unmounts. 302 * 303 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while 304 * dounmount() is still waiting to lock the mountpoint. This allows 305 * the filesystem to cancel operations that might otherwise deadlock 306 * with the unmount attempt (used by NFS). 307 */ 308#define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */ 309#define MNTK_ASYNC 0x00000002 /* filtered async flag */ 310#define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */ 311#define MNTK_UNMOUNT 0x01000000 /* unmount in progress */ 312#define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */ 313#define MNTK_SUSPEND 0x08000000 /* request write suspension */ 314#define MNTK_SUSPEND2 0x04000000 /* block secondary writes */ 315#define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */ 316#define MNTK_MPSAFE 0x20000000 /* Filesystem is MPSAFE. */ 317#define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */ 318#define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */ 319 320/* 321 * Sysctl CTL_VFS definitions. 322 * 323 * Second level identifier specifies which filesystem. Second level 324 * identifier VFS_VFSCONF returns information about all filesystems. 325 * Second level identifier VFS_GENERIC is non-terminal. 326 */ 327#define VFS_VFSCONF 0 /* get configured filesystems */ 328#define VFS_GENERIC 0 /* generic filesystem information */ 329/* 330 * Third level identifiers for VFS_GENERIC are given below; third 331 * level identifiers for specific filesystems are given in their 332 * mount specific header files. 333 */ 334#define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */ 335#define VFS_CONF 2 /* struct: vfsconf for filesystem given 336 as next argument */ 337 338/* 339 * Flags for various system call interfaces. 340 * 341 * waitfor flags to vfs_sync() and getfsstat() 342 */ 343#define MNT_WAIT 1 /* synchronously wait for I/O to complete */ 344#define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */ 345#define MNT_LAZY 3 /* push data not written by filesystem syncer */ 346#define MNT_SUSPEND 4 /* Suspend file system after sync */ 347 348/* 349 * Generic file handle 350 */ 351struct fhandle { 352 fsid_t fh_fsid; /* Filesystem id of mount point */ 353 struct fid fh_fid; /* Filesys specific id */ 354}; 355typedef struct fhandle fhandle_t; 356 357/* 358 * Export arguments for local filesystem mount calls. 359 */ 360struct export_args { 361 int ex_flags; /* export related flags */ 362 uid_t ex_root; /* mapping for root uid */ 363 struct xucred ex_anon; /* mapping for anonymous user */ 364 struct sockaddr *ex_addr; /* net address to which exported */ 365 u_char ex_addrlen; /* and the net address length */ 366 struct sockaddr *ex_mask; /* mask of valid bits in saddr */ 367 u_char ex_masklen; /* and the smask length */ 368 char *ex_indexfile; /* index file for WebNFS URLs */ 369}; 370 371/* 372 * Structure holding information for a publicly exported filesystem 373 * (WebNFS). Currently the specs allow just for one such filesystem. 374 */ 375struct nfs_public { 376 int np_valid; /* Do we hold valid information */ 377 fhandle_t np_handle; /* Filehandle for pub fs (internal) */ 378 struct mount *np_mount; /* Mountpoint of exported fs */ 379 char *np_index; /* Index file */ 380}; 381 382/* 383 * Filesystem configuration information. One of these exists for each 384 * type of filesystem supported by the kernel. These are searched at 385 * mount time to identify the requested filesystem. 386 * 387 * XXX: Never change the first two arguments! 388 */ 389struct vfsconf { 390 u_int vfc_version; /* ABI version number */ 391 char vfc_name[MFSNAMELEN]; /* filesystem type name */ 392 struct vfsops *vfc_vfsops; /* filesystem operations vector */ 393 int vfc_typenum; /* historic filesystem type number */ 394 int vfc_refcount; /* number mounted of this type */ 395 int vfc_flags; /* permanent flags */ 396 struct vfsoptdecl *vfc_opts; /* mount options */ 397 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */ 398}; 399 400/* Userland version of the struct vfsconf. */ 401struct xvfsconf { 402 struct vfsops *vfc_vfsops; /* filesystem operations vector */ 403 char vfc_name[MFSNAMELEN]; /* filesystem type name */ 404 int vfc_typenum; /* historic filesystem type number */ 405 int vfc_refcount; /* number mounted of this type */ 406 int vfc_flags; /* permanent flags */ 407 struct vfsconf *vfc_next; /* next in list */ 408}; 409 410#ifndef BURN_BRIDGES 411struct ovfsconf { 412 void *vfc_vfsops; 413 char vfc_name[32]; 414 int vfc_index; 415 int vfc_refcount; 416 int vfc_flags; 417}; 418#endif 419 420/* 421 * NB: these flags refer to IMPLEMENTATION properties, not properties of 422 * any actual mounts; i.e., it does not make sense to change the flags. 423 */ 424#define VFCF_STATIC 0x00010000 /* statically compiled into kernel */ 425#define VFCF_NETWORK 0x00020000 /* may get data over the network */ 426#define VFCF_READONLY 0x00040000 /* writes are not implemented */ 427#define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */ 428#define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */ 429#define VFCF_UNICODE 0x00200000 /* stores file names as Unicode*/ 430 431typedef uint32_t fsctlop_t; 432 433struct vfsidctl { 434 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */ 435 fsid_t vc_fsid; /* fsid to operate on. */ 436 char vc_fstypename[MFSNAMELEN]; 437 /* type of fs 'nfs' or '*' */ 438 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */ 439 void *vc_ptr; /* pointer to data structure. */ 440 size_t vc_len; /* sizeof said structure. */ 441 u_int32_t vc_spare[12]; /* spare (must be zero). */ 442}; 443 444/* vfsidctl API version. */ 445#define VFS_CTL_VERS1 0x01 446 447/* 448 * New style VFS sysctls, do not reuse/conflict with the namespace for 449 * private sysctls. 450 * All "global" sysctl ops have the 33rd bit set: 451 * 0x...1.... 452 * Private sysctl ops should have the 33rd bit unset. 453 */ 454#define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */ 455#define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */ 456#define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */ 457 458struct vfsquery { 459 u_int32_t vq_flags; 460 u_int32_t vq_spare[31]; 461}; 462 463/* vfsquery flags */ 464#define VQ_NOTRESP 0x0001 /* server down */ 465#define VQ_NEEDAUTH 0x0002 /* server bad auth */ 466#define VQ_LOWDISK 0x0004 /* we're low on space */ 467#define VQ_MOUNT 0x0008 /* new filesystem arrived */ 468#define VQ_UNMOUNT 0x0010 /* filesystem has left */ 469#define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */ 470#define VQ_ASSIST 0x0040 /* filesystem needs assistance from external 471 program */ 472#define VQ_NOTRESPLOCK 0x0080 /* server lockd down */ 473#define VQ_FLAG0100 0x0100 /* placeholder */ 474#define VQ_FLAG0200 0x0200 /* placeholder */ 475#define VQ_FLAG0400 0x0400 /* placeholder */ 476#define VQ_FLAG0800 0x0800 /* placeholder */ 477#define VQ_FLAG1000 0x1000 /* placeholder */ 478#define VQ_FLAG2000 0x2000 /* placeholder */ 479#define VQ_FLAG4000 0x4000 /* placeholder */ 480#define VQ_FLAG8000 0x8000 /* placeholder */ 481 482#ifdef _KERNEL 483/* Point a sysctl request at a vfsidctl's data. */ 484#define VCTLTOREQ(vc, req) \ 485 do { \ 486 (req)->newptr = (vc)->vc_ptr; \ 487 (req)->newlen = (vc)->vc_len; \ 488 (req)->newidx = 0; \ 489 } while (0) 490#endif 491 492struct iovec; 493struct uio; 494 495#ifdef _KERNEL 496 497#ifdef MALLOC_DECLARE 498MALLOC_DECLARE(M_MOUNT); 499#endif 500extern int maxvfsconf; /* highest defined filesystem type */ 501extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */ 502 503TAILQ_HEAD(vfsconfhead, vfsconf); 504extern struct vfsconfhead vfsconf; 505 506/* 507 * Operations supported on mounted filesystem. 508 */ 509struct mount_args; 510struct nameidata; 511struct sysctl_req; 512struct mntarg; 513 514typedef int vfs_cmount_t(struct mntarg *ma, void *data, int flags, struct thread *td); 515typedef int vfs_unmount_t(struct mount *mp, int mntflags, struct thread *td); 516typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp, 517 struct thread *td); 518typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, 519 void *arg, struct thread *td); 520typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp, 521 struct thread *td); 522typedef int vfs_sync_t(struct mount *mp, int waitfor, struct thread *td); 523typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags, 524 struct vnode **vpp); 525typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp); 526typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam, 527 int *extflagsp, struct ucred **credanonp); 528typedef int vfs_vptofh_t(struct vnode *vp, struct fid *fhp); 529typedef int vfs_init_t(struct vfsconf *); 530typedef int vfs_uninit_t(struct vfsconf *); 531typedef int vfs_extattrctl_t(struct mount *mp, int cmd, 532 struct vnode *filename_vp, int attrnamespace, 533 const char *attrname, struct thread *td); 534typedef int vfs_mount_t(struct mount *mp, struct thread *td); 535typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op, 536 struct sysctl_req *req); 537 538struct vfsops { 539 vfs_mount_t *vfs_mount; 540 vfs_cmount_t *vfs_cmount; 541 vfs_unmount_t *vfs_unmount; 542 vfs_root_t *vfs_root; 543 vfs_quotactl_t *vfs_quotactl; 544 vfs_statfs_t *vfs_statfs; 545 vfs_sync_t *vfs_sync; 546 vfs_vget_t *vfs_vget; 547 vfs_fhtovp_t *vfs_fhtovp; 548 vfs_checkexp_t *vfs_checkexp; 549 vfs_vptofh_t *vfs_vptofh; 550 vfs_init_t *vfs_init; 551 vfs_uninit_t *vfs_uninit; 552 vfs_extattrctl_t *vfs_extattrctl; 553 vfs_sysctl_t *vfs_sysctl; 554}; 555 556vfs_statfs_t __vfs_statfs; 557 558#define VFS_MOUNT(MP, P) (*(MP)->mnt_op->vfs_mount)(MP, P) 559#define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P) 560#define VFS_ROOT(MP, FLAGS, VPP, P) \ 561 (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP, P) 562#define VFS_QUOTACTL(MP,C,U,A,P) (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P) 563#define VFS_STATFS(MP, SBP, P) __vfs_statfs((MP), (SBP), (P)) 564#define VFS_SYNC(MP, WAIT, P) (*(MP)->mnt_op->vfs_sync)(MP, WAIT, P) 565#define VFS_VGET(MP, INO, FLAGS, VPP) \ 566 (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP) 567#define VFS_FHTOVP(MP, FIDP, VPP) \ 568 (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP) 569#define VFS_VPTOFH(VP, FIDP) (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP) 570#define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \ 571 (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED) 572#define VFS_EXTATTRCTL(MP, C, FN, NS, N, P) \ 573 (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N, P) 574#define VFS_SYSCTL(MP, OP, REQ) \ 575 (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ) 576 577extern int mpsafe_vfs; 578 579#define VFS_NEEDSGIANT(MP) \ 580 (!mpsafe_vfs || ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0)) 581 582#define VFS_LOCK_GIANT(MP) __extension__ \ 583({ \ 584 int _locked; \ 585 struct mount *_MP; \ 586 _MP = (MP); \ 587 if (VFS_NEEDSGIANT(_MP)) { \ 588 mtx_lock(&Giant); \ 589 _locked = 1; \ 590 } else \ 591 _locked = 0; \ 592 _locked; \ 593}) 594#define VFS_UNLOCK_GIANT(locked) if ((locked)) mtx_unlock(&Giant); 595#define VFS_ASSERT_GIANT(MP) do \ 596{ \ 597 if (VFS_NEEDSGIANT((MP))) \ 598 mtx_assert(&Giant, MA_OWNED); \ 599} while (0) 600 601#define VFS_KNOTE_LOCKED(vp, hint) do \ 602{ \ 603 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \ 604 VN_KNOTE((vp), (hint), 1); \ 605} while (0) 606 607#define VFS_KNOTE_UNLOCKED(vp, hint) do \ 608{ \ 609 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \ 610 VN_KNOTE((vp), (hint), 0); \ 611} while (0) 612 613#include <sys/module.h> 614 615/* 616 * Version numbers. 617 */ 618#define VFS_VERSION_00 0x19660120 619#define VFS_VERSION VFS_VERSION_00 620 621#define VFS_SET(vfsops, fsname, flags) \ 622 static struct vfsconf fsname ## _vfsconf = { \ 623 .vfc_version = VFS_VERSION, \ 624 .vfc_name = #fsname, \ 625 .vfc_vfsops = &vfsops, \ 626 .vfc_typenum = -1, \ 627 .vfc_flags = flags, \ 628 }; \ 629 static moduledata_t fsname ## _mod = { \ 630 #fsname, \ 631 vfs_modevent, \ 632 & fsname ## _vfsconf \ 633 }; \ 634 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE) 635 636extern char *mountrootfsname; 637 638/* 639 * exported vnode operations 640 */ 641 642int dounmount(struct mount *, int, struct thread *); 643 644int kernel_mount(struct mntarg *ma, int flags); 645int kernel_vmount(int flags, ...); 646struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len); 647struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name); 648struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...); 649struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len); 650struct vfsconf *vfs_byname(const char *); 651struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *); 652void vfs_event_signal(fsid_t *, u_int32_t, intptr_t); 653int vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val); 654int vfs_getopt(struct vfsoptlist *, const char *, void **, int *); 655char *vfs_getopts(struct vfsoptlist *, const char *, int *error); 656int vfs_copyopt(struct vfsoptlist *, const char *, void *, int); 657int vfs_filteropt(struct vfsoptlist *, const char **legal); 658int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...); 659int vfs_setpublicfs /* set publicly exported fs */ 660 (struct mount *, struct netexport *, struct export_args *); 661void vfs_msync(struct mount *, int); 662int vfs_busy(struct mount *, int, struct mtx *, struct thread *); 663int vfs_export /* process mount export info */ 664 (struct mount *, struct export_args *); 665int vfs_allocate_syncvnode(struct mount *); 666void vfs_getnewfsid(struct mount *); 667struct cdev *vfs_getrootfsid(struct mount *); 668struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */ 669int vfs_modevent(module_t, int, void *); 670void vfs_mount_error(struct mount *, const char *, ...); 671void vfs_mountroot(void); /* mount our root filesystem */ 672void vfs_mountedfrom(struct mount *, const char *from); 673void vfs_ref(struct mount *); 674void vfs_rel(struct mount *); 675int vfs_suser(struct mount *, struct thread *); 676void vfs_unbusy(struct mount *, struct thread *); 677void vfs_unmountall(void); 678extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */ 679extern struct mtx mountlist_mtx; 680extern struct nfs_public nfs_pub; 681 682/* 683 * Declarations for these vfs default operations are located in 684 * kern/vfs_default.c, they should be used instead of making "dummy" 685 * functions or casting entries in the VFS op table to "enopnotsupp()". 686 */ 687vfs_root_t vfs_stdroot; 688vfs_quotactl_t vfs_stdquotactl; 689vfs_statfs_t vfs_stdstatfs; 690vfs_sync_t vfs_stdsync; 691vfs_sync_t vfs_stdnosync; 692vfs_vget_t vfs_stdvget; 693vfs_fhtovp_t vfs_stdfhtovp; 694vfs_checkexp_t vfs_stdcheckexp; 695vfs_vptofh_t vfs_stdvptofh; 696vfs_init_t vfs_stdinit; 697vfs_uninit_t vfs_stduninit; 698vfs_extattrctl_t vfs_stdextattrctl; 699vfs_sysctl_t vfs_stdsysctl; 700 701#else /* !_KERNEL */ 702 703#include <sys/cdefs.h> 704 705struct stat; 706 707__BEGIN_DECLS 708int fhopen(const struct fhandle *, int); 709int fhstat(const struct fhandle *, struct stat *); 710int fhstatfs(const struct fhandle *, struct statfs *); 711int fstatfs(int, struct statfs *); 712int getfh(const char *, fhandle_t *); 713int getfsstat(struct statfs *, long, int); 714int getmntinfo(struct statfs **, int); 715int lgetfh(const char *, fhandle_t *); 716int mount(const char *, const char *, int, void *); 717int nmount(struct iovec *, unsigned int, int); 718int statfs(const char *, struct statfs *); 719int unmount(const char *, int); 720 721/* C library stuff */ 722int getvfsbyname(const char *, struct xvfsconf *); 723__END_DECLS 724 725#endif /* _KERNEL */ 726 727#endif /* !_SYS_MOUNT_H_ */ 728