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FreeBSD/Linux Kernel Cross Reference
sys/sys/mount.h
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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: releng/10.0/sys/sys/mount.h 255136 2013-09-01 23:02:59Z rmacklem $ 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 49 typedef 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 57 struct fid { 58 u_short fid_len; /* length of data in bytes */ 59 u_short fid_data0; /* 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 */ 69 struct 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. */ 100 struct 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 TAILQ_HEAD(vnodelst, vnode); 131 132 /* Mount options list */ 133 TAILQ_HEAD(vfsoptlist, vfsopt); 134 struct vfsopt { 135 TAILQ_ENTRY(vfsopt) link; 136 char *name; 137 void *value; 138 int len; 139 int pos; 140 int seen; 141 }; 142 143 /* 144 * Structure per mounted filesystem. Each mounted filesystem has an 145 * array of operations and an instance record. The filesystems are 146 * put on a doubly linked list. 147 * 148 * Lock reference: 149 * m - mountlist_mtx 150 * i - interlock 151 * v - vnode freelist mutex 152 * 153 * Unmarked fields are considered stable as long as a ref is held. 154 * 155 */ 156 struct mount { 157 struct mtx mnt_mtx; /* mount structure interlock */ 158 int mnt_gen; /* struct mount generation */ 159 #define mnt_startzero mnt_list 160 TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */ 161 struct vfsops *mnt_op; /* operations on fs */ 162 struct vfsconf *mnt_vfc; /* configuration info */ 163 struct vnode *mnt_vnodecovered; /* vnode we mounted on */ 164 struct vnode *mnt_syncer; /* syncer vnode */ 165 int mnt_ref; /* (i) Reference count */ 166 struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */ 167 int mnt_nvnodelistsize; /* (i) # of vnodes */ 168 struct vnodelst mnt_activevnodelist; /* (v) list of active vnodes */ 169 int mnt_activevnodelistsize;/* (v) # of active vnodes */ 170 int mnt_writeopcount; /* (i) write syscalls pending */ 171 int mnt_kern_flag; /* (i) kernel only flags */ 172 uint64_t mnt_flag; /* (i) flags shared with user */ 173 struct vfsoptlist *mnt_opt; /* current mount options */ 174 struct vfsoptlist *mnt_optnew; /* new options passed to fs */ 175 int mnt_maxsymlinklen; /* max size of short symlink */ 176 struct statfs mnt_stat; /* cache of filesystem stats */ 177 struct ucred *mnt_cred; /* credentials of mounter */ 178 void * mnt_data; /* private data */ 179 time_t mnt_time; /* last time written*/ 180 int mnt_iosize_max; /* max size for clusters, etc */ 181 struct netexport *mnt_export; /* export list */ 182 struct label *mnt_label; /* MAC label for the fs */ 183 u_int mnt_hashseed; /* Random seed for vfs_hash */ 184 int mnt_lockref; /* (i) Lock reference count */ 185 int mnt_secondary_writes; /* (i) # of secondary writes */ 186 int mnt_secondary_accwrites;/* (i) secondary wr. starts */ 187 struct thread *mnt_susp_owner; /* (i) thread owning suspension */ 188 #define mnt_endzero mnt_gjprovider 189 char *mnt_gjprovider; /* gjournal provider name */ 190 struct lock mnt_explock; /* vfs_export walkers lock */ 191 TAILQ_ENTRY(mount) mnt_upper_link; /* (m) we in the all uppers */ 192 TAILQ_HEAD(, mount) mnt_uppers; /* (m) upper mounts over us*/ 193 }; 194 195 /* 196 * Definitions for MNT_VNODE_FOREACH_ALL. 197 */ 198 struct vnode *__mnt_vnode_next_all(struct vnode **mvp, struct mount *mp); 199 struct vnode *__mnt_vnode_first_all(struct vnode **mvp, struct mount *mp); 200 void __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp); 201 202 #define MNT_VNODE_FOREACH_ALL(vp, mp, mvp) \ 203 for (vp = __mnt_vnode_first_all(&(mvp), (mp)); \ 204 (vp) != NULL; vp = __mnt_vnode_next_all(&(mvp), (mp))) 205 206 #define MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp) \ 207 do { \ 208 MNT_ILOCK(mp); \ 209 __mnt_vnode_markerfree_all(&(mvp), (mp)); \ 210 /* MNT_IUNLOCK(mp); -- done in above function */ \ 211 mtx_assert(MNT_MTX(mp), MA_NOTOWNED); \ 212 } while (0) 213 214 /* 215 * Definitions for MNT_VNODE_FOREACH_ACTIVE. 216 */ 217 struct vnode *__mnt_vnode_next_active(struct vnode **mvp, struct mount *mp); 218 struct vnode *__mnt_vnode_first_active(struct vnode **mvp, struct mount *mp); 219 void __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *); 220 221 #define MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) \ 222 for (vp = __mnt_vnode_first_active(&(mvp), (mp)); \ 223 (vp) != NULL; vp = __mnt_vnode_next_active(&(mvp), (mp))) 224 225 #define MNT_VNODE_FOREACH_ACTIVE_ABORT(mp, mvp) \ 226 __mnt_vnode_markerfree_active(&(mvp), (mp)) 227 228 #define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx) 229 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx) 230 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx) 231 #define MNT_MTX(mp) (&(mp)->mnt_mtx) 232 #define MNT_REF(mp) (mp)->mnt_ref++ 233 #define MNT_REL(mp) do { \ 234 KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref")); \ 235 (mp)->mnt_ref--; \ 236 if ((mp)->mnt_ref == 0) \ 237 wakeup((mp)); \ 238 } while (0) 239 240 #endif /* _KERNEL */ 241 242 /* 243 * User specifiable flags, stored in mnt_flag. 244 */ 245 #define MNT_RDONLY 0x0000000000000001ULL /* read only filesystem */ 246 #define MNT_SYNCHRONOUS 0x0000000000000002ULL /* fs written synchronously */ 247 #define MNT_NOEXEC 0x0000000000000004ULL /* can't exec from filesystem */ 248 #define MNT_NOSUID 0x0000000000000008ULL /* don't honor setuid fs bits */ 249 #define MNT_NFS4ACLS 0x0000000000000010ULL /* enable NFS version 4 ACLs */ 250 #define MNT_UNION 0x0000000000000020ULL /* union with underlying fs */ 251 #define MNT_ASYNC 0x0000000000000040ULL /* fs written asynchronously */ 252 #define MNT_SUIDDIR 0x0000000000100000ULL /* special SUID dir handling */ 253 #define MNT_SOFTDEP 0x0000000000200000ULL /* using soft updates */ 254 #define MNT_NOSYMFOLLOW 0x0000000000400000ULL /* do not follow symlinks */ 255 #define MNT_GJOURNAL 0x0000000002000000ULL /* GEOM journal support enabled */ 256 #define MNT_MULTILABEL 0x0000000004000000ULL /* MAC support for objects */ 257 #define MNT_ACLS 0x0000000008000000ULL /* ACL support enabled */ 258 #define MNT_NOATIME 0x0000000010000000ULL /* dont update file access time */ 259 #define MNT_NOCLUSTERR 0x0000000040000000ULL /* disable cluster read */ 260 #define MNT_NOCLUSTERW 0x0000000080000000ULL /* disable cluster write */ 261 #define MNT_SUJ 0x0000000100000000ULL /* using journaled soft updates */ 262 263 /* 264 * NFS export related mount flags. 265 */ 266 #define MNT_EXRDONLY 0x0000000000000080ULL /* exported read only */ 267 #define MNT_EXPORTED 0x0000000000000100ULL /* filesystem is exported */ 268 #define MNT_DEFEXPORTED 0x0000000000000200ULL /* exported to the world */ 269 #define MNT_EXPORTANON 0x0000000000000400ULL /* anon uid mapping for all */ 270 #define MNT_EXKERB 0x0000000000000800ULL /* exported with Kerberos */ 271 #define MNT_EXPUBLIC 0x0000000020000000ULL /* public export (WebNFS) */ 272 273 /* 274 * Flags set by internal operations, 275 * but visible to the user. 276 * XXX some of these are not quite right.. (I've never seen the root flag set) 277 */ 278 #define MNT_LOCAL 0x0000000000001000ULL /* filesystem is stored locally */ 279 #define MNT_QUOTA 0x0000000000002000ULL /* quotas are enabled on fs */ 280 #define MNT_ROOTFS 0x0000000000004000ULL /* identifies the root fs */ 281 #define MNT_USER 0x0000000000008000ULL /* mounted by a user */ 282 #define MNT_IGNORE 0x0000000000800000ULL /* do not show entry in df */ 283 284 /* 285 * Mask of flags that are visible to statfs(). 286 * XXX I think that this could now become (~(MNT_CMDFLAGS)) 287 * but the 'mount' program may need changing to handle this. 288 */ 289 #define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \ 290 MNT_NOSUID | MNT_UNION | MNT_SUJ | \ 291 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \ 292 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \ 293 MNT_LOCAL | MNT_USER | MNT_QUOTA | \ 294 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \ 295 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \ 296 MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \ 297 MNT_GJOURNAL | MNT_MULTILABEL | MNT_ACLS | \ 298 MNT_NFS4ACLS) 299 300 /* Mask of flags that can be updated. */ 301 #define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \ 302 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \ 303 MNT_NOATIME | \ 304 MNT_NOSYMFOLLOW | MNT_IGNORE | \ 305 MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \ 306 MNT_ACLS | MNT_USER | MNT_NFS4ACLS) 307 308 /* 309 * External filesystem command modifier flags. 310 * Unmount can use the MNT_FORCE flag. 311 * XXX: These are not STATES and really should be somewhere else. 312 * XXX: MNT_BYFSID collides with MNT_ACLS, but because MNT_ACLS is only used for 313 * mount(2) and MNT_BYFSID is only used for unmount(2) it's harmless. 314 */ 315 #define MNT_UPDATE 0x0000000000010000ULL /* not real mount, just update */ 316 #define MNT_DELEXPORT 0x0000000000020000ULL /* delete export host lists */ 317 #define MNT_RELOAD 0x0000000000040000ULL /* reload filesystem data */ 318 #define MNT_FORCE 0x0000000000080000ULL /* force unmount or readonly */ 319 #define MNT_SNAPSHOT 0x0000000001000000ULL /* snapshot the filesystem */ 320 #define MNT_BYFSID 0x0000000008000000ULL /* specify filesystem by ID. */ 321 #define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \ 322 MNT_FORCE | MNT_SNAPSHOT | MNT_BYFSID) 323 /* 324 * Internal filesystem control flags stored in mnt_kern_flag. 325 * 326 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed 327 * past the mount point. This keeps the subtree stable during mounts 328 * and unmounts. 329 * 330 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while 331 * dounmount() is still waiting to lock the mountpoint. This allows 332 * the filesystem to cancel operations that might otherwise deadlock 333 * with the unmount attempt (used by NFS). 334 * 335 * MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated 336 * to allow for failed unmount attempt to restore the syncer vnode for 337 * the mount. 338 */ 339 #define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */ 340 #define MNTK_ASYNC 0x00000002 /* filtered async flag */ 341 #define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */ 342 #define MNTK_NOINSMNTQ 0x00000008 /* insmntque is not allowed */ 343 #define MNTK_DRAINING 0x00000010 /* lock draining is happening */ 344 #define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */ 345 #define MNTK_EXTENDED_SHARED 0x00000040 /* Allow shared locking for more ops */ 346 #define MNTK_SHARED_WRITES 0x00000080 /* Allow shared locking for writes */ 347 #define MNTK_NO_IOPF 0x00000100 /* Disallow page faults during reads 348 and writes. Filesystem shall properly 349 handle i/o state on EFAULT. */ 350 #define MNTK_VGONE_UPPER 0x00000200 351 #define MNTK_VGONE_WAITER 0x00000400 352 #define MNTK_LOOKUP_EXCL_DOTDOT 0x00000800 353 #define MNTK_MARKER 0x00001000 354 #define MNTK_UNMAPPED_BUFS 0x00002000 355 #define MNTK_NOASYNC 0x00800000 /* disable async */ 356 #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */ 357 #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */ 358 #define MNTK_SUSPEND 0x08000000 /* request write suspension */ 359 #define MNTK_SUSPEND2 0x04000000 /* block secondary writes */ 360 #define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */ 361 #define MNTK_UNUSED25 0x20000000 /* --available-- */ 362 #define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */ 363 #define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */ 364 365 #define MNT_SHARED_WRITES(mp) (((mp) != NULL) && \ 366 ((mp)->mnt_kern_flag & MNTK_SHARED_WRITES)) 367 368 /* 369 * Sysctl CTL_VFS definitions. 370 * 371 * Second level identifier specifies which filesystem. Second level 372 * identifier VFS_VFSCONF returns information about all filesystems. 373 * Second level identifier VFS_GENERIC is non-terminal. 374 */ 375 #define VFS_VFSCONF 0 /* get configured filesystems */ 376 #define VFS_GENERIC 0 /* generic filesystem information */ 377 /* 378 * Third level identifiers for VFS_GENERIC are given below; third 379 * level identifiers for specific filesystems are given in their 380 * mount specific header files. 381 */ 382 #define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */ 383 #define VFS_CONF 2 /* struct: vfsconf for filesystem given 384 as next argument */ 385 386 /* 387 * Flags for various system call interfaces. 388 * 389 * waitfor flags to vfs_sync() and getfsstat() 390 */ 391 #define MNT_WAIT 1 /* synchronously wait for I/O to complete */ 392 #define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */ 393 #define MNT_LAZY 3 /* push data not written by filesystem syncer */ 394 #define MNT_SUSPEND 4 /* Suspend file system after sync */ 395 396 /* 397 * Generic file handle 398 */ 399 struct fhandle { 400 fsid_t fh_fsid; /* Filesystem id of mount point */ 401 struct fid fh_fid; /* Filesys specific id */ 402 }; 403 typedef struct fhandle fhandle_t; 404 405 /* 406 * Old export arguments without security flavor list 407 */ 408 struct oexport_args { 409 int ex_flags; /* export related flags */ 410 uid_t ex_root; /* mapping for root uid */ 411 struct xucred ex_anon; /* mapping for anonymous user */ 412 struct sockaddr *ex_addr; /* net address to which exported */ 413 u_char ex_addrlen; /* and the net address length */ 414 struct sockaddr *ex_mask; /* mask of valid bits in saddr */ 415 u_char ex_masklen; /* and the smask length */ 416 char *ex_indexfile; /* index file for WebNFS URLs */ 417 }; 418 419 /* 420 * Export arguments for local filesystem mount calls. 421 */ 422 #define MAXSECFLAVORS 5 423 struct export_args { 424 int ex_flags; /* export related flags */ 425 uid_t ex_root; /* mapping for root uid */ 426 struct xucred ex_anon; /* mapping for anonymous user */ 427 struct sockaddr *ex_addr; /* net address to which exported */ 428 u_char ex_addrlen; /* and the net address length */ 429 struct sockaddr *ex_mask; /* mask of valid bits in saddr */ 430 u_char ex_masklen; /* and the smask length */ 431 char *ex_indexfile; /* index file for WebNFS URLs */ 432 int ex_numsecflavors; /* security flavor count */ 433 int ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */ 434 }; 435 436 /* 437 * Structure holding information for a publicly exported filesystem 438 * (WebNFS). Currently the specs allow just for one such filesystem. 439 */ 440 struct nfs_public { 441 int np_valid; /* Do we hold valid information */ 442 fhandle_t np_handle; /* Filehandle for pub fs (internal) */ 443 struct mount *np_mount; /* Mountpoint of exported fs */ 444 char *np_index; /* Index file */ 445 }; 446 447 /* 448 * Filesystem configuration information. One of these exists for each 449 * type of filesystem supported by the kernel. These are searched at 450 * mount time to identify the requested filesystem. 451 * 452 * XXX: Never change the first two arguments! 453 */ 454 struct vfsconf { 455 u_int vfc_version; /* ABI version number */ 456 char vfc_name[MFSNAMELEN]; /* filesystem type name */ 457 struct vfsops *vfc_vfsops; /* filesystem operations vector */ 458 int vfc_typenum; /* historic filesystem type number */ 459 int vfc_refcount; /* number mounted of this type */ 460 int vfc_flags; /* permanent flags */ 461 struct vfsoptdecl *vfc_opts; /* mount options */ 462 TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */ 463 }; 464 465 /* Userland version of the struct vfsconf. */ 466 struct xvfsconf { 467 struct vfsops *vfc_vfsops; /* filesystem operations vector */ 468 char vfc_name[MFSNAMELEN]; /* filesystem type name */ 469 int vfc_typenum; /* historic filesystem type number */ 470 int vfc_refcount; /* number mounted of this type */ 471 int vfc_flags; /* permanent flags */ 472 struct vfsconf *vfc_next; /* next in list */ 473 }; 474 475 #ifndef BURN_BRIDGES 476 struct ovfsconf { 477 void *vfc_vfsops; 478 char vfc_name[32]; 479 int vfc_index; 480 int vfc_refcount; 481 int vfc_flags; 482 }; 483 #endif 484 485 /* 486 * NB: these flags refer to IMPLEMENTATION properties, not properties of 487 * any actual mounts; i.e., it does not make sense to change the flags. 488 */ 489 #define VFCF_STATIC 0x00010000 /* statically compiled into kernel */ 490 #define VFCF_NETWORK 0x00020000 /* may get data over the network */ 491 #define VFCF_READONLY 0x00040000 /* writes are not implemented */ 492 #define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */ 493 #define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */ 494 #define VFCF_UNICODE 0x00200000 /* stores file names as Unicode */ 495 #define VFCF_JAIL 0x00400000 /* can be mounted from within a jail */ 496 #define VFCF_DELEGADMIN 0x00800000 /* supports delegated administration */ 497 #define VFCF_SBDRY 0x01000000 /* defer stop requests */ 498 499 typedef uint32_t fsctlop_t; 500 501 struct vfsidctl { 502 int vc_vers; /* should be VFSIDCTL_VERS1 (below) */ 503 fsid_t vc_fsid; /* fsid to operate on */ 504 char vc_fstypename[MFSNAMELEN]; 505 /* type of fs 'nfs' or '*' */ 506 fsctlop_t vc_op; /* operation VFS_CTL_* (below) */ 507 void *vc_ptr; /* pointer to data structure */ 508 size_t vc_len; /* sizeof said structure */ 509 u_int32_t vc_spare[12]; /* spare (must be zero) */ 510 }; 511 512 /* vfsidctl API version. */ 513 #define VFS_CTL_VERS1 0x01 514 515 /* 516 * New style VFS sysctls, do not reuse/conflict with the namespace for 517 * private sysctls. 518 * All "global" sysctl ops have the 33rd bit set: 519 * 0x...1.... 520 * Private sysctl ops should have the 33rd bit unset. 521 */ 522 #define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */ 523 #define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */ 524 #define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */ 525 526 struct vfsquery { 527 u_int32_t vq_flags; 528 u_int32_t vq_spare[31]; 529 }; 530 531 /* vfsquery flags */ 532 #define VQ_NOTRESP 0x0001 /* server down */ 533 #define VQ_NEEDAUTH 0x0002 /* server bad auth */ 534 #define VQ_LOWDISK 0x0004 /* we're low on space */ 535 #define VQ_MOUNT 0x0008 /* new filesystem arrived */ 536 #define VQ_UNMOUNT 0x0010 /* filesystem has left */ 537 #define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */ 538 #define VQ_ASSIST 0x0040 /* filesystem needs assistance from external 539 program */ 540 #define VQ_NOTRESPLOCK 0x0080 /* server lockd down */ 541 #define VQ_FLAG0100 0x0100 /* placeholder */ 542 #define VQ_FLAG0200 0x0200 /* placeholder */ 543 #define VQ_FLAG0400 0x0400 /* placeholder */ 544 #define VQ_FLAG0800 0x0800 /* placeholder */ 545 #define VQ_FLAG1000 0x1000 /* placeholder */ 546 #define VQ_FLAG2000 0x2000 /* placeholder */ 547 #define VQ_FLAG4000 0x4000 /* placeholder */ 548 #define VQ_FLAG8000 0x8000 /* placeholder */ 549 550 #ifdef _KERNEL 551 /* Point a sysctl request at a vfsidctl's data. */ 552 #define VCTLTOREQ(vc, req) \ 553 do { \ 554 (req)->newptr = (vc)->vc_ptr; \ 555 (req)->newlen = (vc)->vc_len; \ 556 (req)->newidx = 0; \ 557 } while (0) 558 #endif 559 560 struct iovec; 561 struct uio; 562 563 #ifdef _KERNEL 564 565 /* 566 * vfs_busy specific flags and mask. 567 */ 568 #define MBF_NOWAIT 0x01 569 #define MBF_MNTLSTLOCK 0x02 570 #define MBF_MASK (MBF_NOWAIT | MBF_MNTLSTLOCK) 571 572 #ifdef MALLOC_DECLARE 573 MALLOC_DECLARE(M_MOUNT); 574 #endif 575 extern int maxvfsconf; /* highest defined filesystem type */ 576 extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */ 577 578 TAILQ_HEAD(vfsconfhead, vfsconf); 579 extern struct vfsconfhead vfsconf; 580 581 /* 582 * Operations supported on mounted filesystem. 583 */ 584 struct mount_args; 585 struct nameidata; 586 struct sysctl_req; 587 struct mntarg; 588 589 typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags); 590 typedef int vfs_unmount_t(struct mount *mp, int mntflags); 591 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp); 592 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg); 593 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp); 594 typedef int vfs_sync_t(struct mount *mp, int waitfor); 595 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags, 596 struct vnode **vpp); 597 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, 598 int flags, struct vnode **vpp); 599 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam, 600 int *extflagsp, struct ucred **credanonp, 601 int *numsecflavors, int **secflavors); 602 typedef int vfs_init_t(struct vfsconf *); 603 typedef int vfs_uninit_t(struct vfsconf *); 604 typedef int vfs_extattrctl_t(struct mount *mp, int cmd, 605 struct vnode *filename_vp, int attrnamespace, 606 const char *attrname); 607 typedef int vfs_mount_t(struct mount *mp); 608 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op, 609 struct sysctl_req *req); 610 typedef void vfs_susp_clean_t(struct mount *mp); 611 typedef void vfs_notify_lowervp_t(struct mount *mp, struct vnode *lowervp); 612 typedef void vfs_purge_t(struct mount *mp); 613 614 struct vfsops { 615 vfs_mount_t *vfs_mount; 616 vfs_cmount_t *vfs_cmount; 617 vfs_unmount_t *vfs_unmount; 618 vfs_root_t *vfs_root; 619 vfs_quotactl_t *vfs_quotactl; 620 vfs_statfs_t *vfs_statfs; 621 vfs_sync_t *vfs_sync; 622 vfs_vget_t *vfs_vget; 623 vfs_fhtovp_t *vfs_fhtovp; 624 vfs_checkexp_t *vfs_checkexp; 625 vfs_init_t *vfs_init; 626 vfs_uninit_t *vfs_uninit; 627 vfs_extattrctl_t *vfs_extattrctl; 628 vfs_sysctl_t *vfs_sysctl; 629 vfs_susp_clean_t *vfs_susp_clean; 630 vfs_notify_lowervp_t *vfs_reclaim_lowervp; 631 vfs_notify_lowervp_t *vfs_unlink_lowervp; 632 vfs_purge_t *vfs_purge; 633 vfs_mount_t *vfs_spare[6]; /* spares for ABI compat */ 634 }; 635 636 vfs_statfs_t __vfs_statfs; 637 638 #define VFS_PROLOGUE(MP) do { \ 639 int _enable_stops; \ 640 \ 641 _enable_stops = ((MP) != NULL && \ 642 ((MP)->mnt_vfc->vfc_flags & VFCF_SBDRY) && sigdeferstop()) 643 644 #define VFS_EPILOGUE(MP) \ 645 if (_enable_stops) \ 646 sigallowstop(); \ 647 } while (0) 648 649 #define VFS_MOUNT(MP) ({ \ 650 int _rc; \ 651 \ 652 VFS_PROLOGUE(MP); \ 653 _rc = (*(MP)->mnt_op->vfs_mount)(MP); \ 654 VFS_EPILOGUE(MP); \ 655 _rc; }) 656 657 #define VFS_UNMOUNT(MP, FORCE) ({ \ 658 int _rc; \ 659 \ 660 VFS_PROLOGUE(MP); \ 661 _rc = (*(MP)->mnt_op->vfs_unmount)(MP, FORCE); \ 662 VFS_EPILOGUE(MP); \ 663 _rc; }) 664 665 #define VFS_ROOT(MP, FLAGS, VPP) ({ \ 666 int _rc; \ 667 \ 668 VFS_PROLOGUE(MP); \ 669 _rc = (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP); \ 670 VFS_EPILOGUE(MP); \ 671 _rc; }) 672 673 #define VFS_QUOTACTL(MP, C, U, A) ({ \ 674 int _rc; \ 675 \ 676 VFS_PROLOGUE(MP); \ 677 _rc = (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A); \ 678 VFS_EPILOGUE(MP); \ 679 _rc; }) 680 681 #define VFS_STATFS(MP, SBP) ({ \ 682 int _rc; \ 683 \ 684 VFS_PROLOGUE(MP); \ 685 _rc = __vfs_statfs((MP), (SBP)); \ 686 VFS_EPILOGUE(MP); \ 687 _rc; }) 688 689 #define VFS_SYNC(MP, WAIT) ({ \ 690 int _rc; \ 691 \ 692 VFS_PROLOGUE(MP); \ 693 _rc = (*(MP)->mnt_op->vfs_sync)(MP, WAIT); \ 694 VFS_EPILOGUE(MP); \ 695 _rc; }) 696 697 #define VFS_VGET(MP, INO, FLAGS, VPP) ({ \ 698 int _rc; \ 699 \ 700 VFS_PROLOGUE(MP); \ 701 _rc = (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP); \ 702 VFS_EPILOGUE(MP); \ 703 _rc; }) 704 705 #define VFS_FHTOVP(MP, FIDP, FLAGS, VPP) ({ \ 706 int _rc; \ 707 \ 708 VFS_PROLOGUE(MP); \ 709 _rc = (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, FLAGS, VPP); \ 710 VFS_EPILOGUE(MP); \ 711 _rc; }) 712 713 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) ({ \ 714 int _rc; \ 715 \ 716 VFS_PROLOGUE(MP); \ 717 _rc = (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC,\ 718 SEC); \ 719 VFS_EPILOGUE(MP); \ 720 _rc; }) 721 722 #define VFS_EXTATTRCTL(MP, C, FN, NS, N) ({ \ 723 int _rc; \ 724 \ 725 VFS_PROLOGUE(MP); \ 726 _rc = (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N); \ 727 VFS_EPILOGUE(MP); \ 728 _rc; }) 729 730 #define VFS_SYSCTL(MP, OP, REQ) ({ \ 731 int _rc; \ 732 \ 733 VFS_PROLOGUE(MP); \ 734 _rc = (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ); \ 735 VFS_EPILOGUE(MP); \ 736 _rc; }) 737 738 #define VFS_SUSP_CLEAN(MP) do { \ 739 if (*(MP)->mnt_op->vfs_susp_clean != NULL) { \ 740 VFS_PROLOGUE(MP); \ 741 (*(MP)->mnt_op->vfs_susp_clean)(MP); \ 742 VFS_EPILOGUE(MP); \ 743 } \ 744 } while (0) 745 746 #define VFS_RECLAIM_LOWERVP(MP, VP) do { \ 747 if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) { \ 748 VFS_PROLOGUE(MP); \ 749 (*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP)); \ 750 VFS_EPILOGUE(MP); \ 751 } \ 752 } while (0) 753 754 #define VFS_UNLINK_LOWERVP(MP, VP) do { \ 755 if (*(MP)->mnt_op->vfs_unlink_lowervp != NULL) { \ 756 VFS_PROLOGUE(MP); \ 757 (*(MP)->mnt_op->vfs_unlink_lowervp)((MP), (VP)); \ 758 VFS_EPILOGUE(MP); \ 759 } \ 760 } while (0) 761 762 #define VFS_PURGE(MP) do { \ 763 if (*(MP)->mnt_op->vfs_purge != NULL) { \ 764 VFS_PROLOGUE(MP); \ 765 (*(MP)->mnt_op->vfs_purge)(MP); \ 766 VFS_EPILOGUE(MP); \ 767 } \ 768 } while (0) 769 770 #define VFS_KNOTE_LOCKED(vp, hint) do \ 771 { \ 772 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \ 773 VN_KNOTE((vp), (hint), KNF_LISTLOCKED); \ 774 } while (0) 775 776 #define VFS_KNOTE_UNLOCKED(vp, hint) do \ 777 { \ 778 if (((vp)->v_vflag & VV_NOKNOTE) == 0) \ 779 VN_KNOTE((vp), (hint), 0); \ 780 } while (0) 781 782 #define VFS_NOTIFY_UPPER_RECLAIM 1 783 #define VFS_NOTIFY_UPPER_UNLINK 2 784 785 #include <sys/module.h> 786 787 /* 788 * Version numbers. 789 */ 790 #define VFS_VERSION_00 0x19660120 791 #define VFS_VERSION_01 0x20121030 792 #define VFS_VERSION VFS_VERSION_01 793 794 #define VFS_SET(vfsops, fsname, flags) \ 795 static struct vfsconf fsname ## _vfsconf = { \ 796 .vfc_version = VFS_VERSION, \ 797 .vfc_name = #fsname, \ 798 .vfc_vfsops = &vfsops, \ 799 .vfc_typenum = -1, \ 800 .vfc_flags = flags, \ 801 }; \ 802 static moduledata_t fsname ## _mod = { \ 803 #fsname, \ 804 vfs_modevent, \ 805 & fsname ## _vfsconf \ 806 }; \ 807 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE) 808 809 extern char *mountrootfsname; 810 811 /* 812 * exported vnode operations 813 */ 814 815 int dounmount(struct mount *, int, struct thread *); 816 817 int kernel_mount(struct mntarg *ma, uint64_t flags); 818 int kernel_vmount(int flags, ...); 819 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len); 820 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name); 821 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...); 822 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len); 823 void statfs_scale_blocks(struct statfs *sf, long max_size); 824 struct vfsconf *vfs_byname(const char *); 825 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *); 826 void vfs_mount_destroy(struct mount *); 827 void vfs_event_signal(fsid_t *, u_int32_t, intptr_t); 828 void vfs_freeopts(struct vfsoptlist *opts); 829 void vfs_deleteopt(struct vfsoptlist *opts, const char *name); 830 int vfs_buildopts(struct uio *auio, struct vfsoptlist **options); 831 int vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 832 uint64_t val); 833 int vfs_getopt(struct vfsoptlist *, const char *, void **, int *); 834 int vfs_getopt_pos(struct vfsoptlist *opts, const char *name); 835 int vfs_getopt_size(struct vfsoptlist *opts, const char *name, 836 off_t *value); 837 char *vfs_getopts(struct vfsoptlist *, const char *, int *error); 838 int vfs_copyopt(struct vfsoptlist *, const char *, void *, int); 839 int vfs_filteropt(struct vfsoptlist *, const char **legal); 840 void vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...); 841 int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...); 842 int vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, 843 int len); 844 int vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, 845 int len); 846 int vfs_setopts(struct vfsoptlist *opts, const char *name, 847 const char *value); 848 int vfs_setpublicfs /* set publicly exported fs */ 849 (struct mount *, struct netexport *, struct export_args *); 850 void vfs_msync(struct mount *, int); 851 int vfs_busy(struct mount *, int); 852 int vfs_export /* process mount export info */ 853 (struct mount *, struct export_args *); 854 void vfs_allocate_syncvnode(struct mount *); 855 void vfs_deallocate_syncvnode(struct mount *); 856 int vfs_donmount(struct thread *td, uint64_t fsflags, 857 struct uio *fsoptions); 858 void vfs_getnewfsid(struct mount *); 859 struct cdev *vfs_getrootfsid(struct mount *); 860 struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */ 861 struct mount *vfs_busyfs(fsid_t *); 862 int vfs_modevent(module_t, int, void *); 863 void vfs_mount_error(struct mount *, const char *, ...); 864 void vfs_mountroot(void); /* mount our root filesystem */ 865 void vfs_mountedfrom(struct mount *, const char *from); 866 void vfs_notify_upper(struct vnode *, int); 867 void vfs_oexport_conv(const struct oexport_args *oexp, 868 struct export_args *exp); 869 void vfs_ref(struct mount *); 870 void vfs_rel(struct mount *); 871 struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *, 872 struct ucred *); 873 int vfs_suser(struct mount *, struct thread *); 874 void vfs_unbusy(struct mount *); 875 void vfs_unmountall(void); 876 extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */ 877 extern struct mtx mountlist_mtx; 878 extern struct nfs_public nfs_pub; 879 880 /* 881 * Declarations for these vfs default operations are located in 882 * kern/vfs_default.c. They will be automatically used to replace 883 * null entries in VFS ops tables when registering a new filesystem 884 * type in the global table. 885 */ 886 vfs_root_t vfs_stdroot; 887 vfs_quotactl_t vfs_stdquotactl; 888 vfs_statfs_t vfs_stdstatfs; 889 vfs_sync_t vfs_stdsync; 890 vfs_sync_t vfs_stdnosync; 891 vfs_vget_t vfs_stdvget; 892 vfs_fhtovp_t vfs_stdfhtovp; 893 vfs_checkexp_t vfs_stdcheckexp; 894 vfs_init_t vfs_stdinit; 895 vfs_uninit_t vfs_stduninit; 896 vfs_extattrctl_t vfs_stdextattrctl; 897 vfs_sysctl_t vfs_stdsysctl; 898 899 #else /* !_KERNEL */ 900 901 #include <sys/cdefs.h> 902 903 struct stat; 904 905 __BEGIN_DECLS 906 int fhopen(const struct fhandle *, int); 907 int fhstat(const struct fhandle *, struct stat *); 908 int fhstatfs(const struct fhandle *, struct statfs *); 909 int fstatfs(int, struct statfs *); 910 int getfh(const char *, fhandle_t *); 911 int getfsstat(struct statfs *, long, int); 912 int getmntinfo(struct statfs **, int); 913 int lgetfh(const char *, fhandle_t *); 914 int mount(const char *, const char *, int, void *); 915 int nmount(struct iovec *, unsigned int, int); 916 int statfs(const char *, struct statfs *); 917 int unmount(const char *, int); 918 919 /* C library stuff */ 920 int getvfsbyname(const char *, struct xvfsconf *); 921 __END_DECLS 922 923 #endif /* _KERNEL */ 924 925 #endif /* !_SYS_MOUNT_H_ */
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