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 * 3. 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: src/sys/sys/mount.h,v 1.89.2.7 2003/04/04 20:35:57 tegge Exp $ 31 */ 32 33 #ifndef _SYS_MOUNT_H_ 34 #define _SYS_MOUNT_H_ 35 36 #include <sys/queue.h> 37 #include <sys/tree.h> 38 #include <sys/ucred.h> 39 40 #ifndef _KERNEL 41 #if __BSD_VISIBLE 42 #include <sys/stat.h> 43 #endif /* __BSD_VISIBLE */ 44 #endif /* !_KERNEL */ 45 46 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 47 #ifndef _SYS_LOCK_H_ 48 #include <sys/lock.h> 49 #endif 50 #ifndef _SYS_NAMECACHE_H_ 51 #include <sys/namecache.h> 52 #endif 53 #ifndef _SYS_STATVFS_H_ 54 #include <sys/statvfs.h> 55 #endif 56 #ifndef _SYS_THREAD_H_ 57 #include <sys/thread.h> 58 #endif 59 #include <sys/vfs_quota.h> 60 #include <sys/mplock2.h> 61 #endif 62 63 struct thread; 64 struct journal; 65 struct vop_ops; 66 struct vop_mountctl_args; 67 struct statvfs; 68 struct vmntvnodescan_info; 69 70 typedef struct fsid { int32_t val[2]; } fsid_t; /* file system id type */ 71 72 #define fsidcmp(a, b) memcmp((a), (b), sizeof(fsid_t)) 73 74 /* 75 * File identifier. These are unique per filesystem on a single machine. 76 * 77 * fix_ext is also used by HAMMER. 78 */ 79 #define MAXFIDSZ 16 80 81 struct fid { 82 u_short fid_len; /* length of data in bytes */ 83 u_short fid_ext; /* extended data */ 84 char fid_data[MAXFIDSZ]; /* data (variable length) */ 85 } __packed; 86 87 /* 88 * file system statistics 89 */ 90 91 #define MFSNAMELEN 16 /* length of fs type name, including null */ 92 #define MNAMELEN 80 /* length of buffer for returned name */ 93 94 struct statfs { 95 long f_spare2; /* placeholder */ 96 long f_bsize; /* fundamental file system block size */ 97 long f_iosize; /* optimal transfer block size */ 98 long f_blocks; /* total data blocks in file system */ 99 long f_bfree; /* free blocks in fs */ 100 long f_bavail; /* free blocks avail to non-superuser */ 101 long f_files; /* total file nodes in file system */ 102 long f_ffree; /* free file nodes in fs */ 103 fsid_t f_fsid; /* file system id */ 104 uid_t f_owner; /* user that mounted the filesystem */ 105 int f_type; /* type of filesystem */ 106 int f_flags; /* copy of mount exported flags */ 107 long f_syncwrites; /* count of sync writes since mount */ 108 long f_asyncwrites; /* count of async writes since mount */ 109 char f_fstypename[MFSNAMELEN]; /* fs type name */ 110 char f_mntonname[MNAMELEN]; /* directory on which mounted */ 111 long f_syncreads; /* count of sync reads since mount */ 112 long f_asyncreads; /* count of async reads since mount */ 113 short f_spares1; /* unused spare */ 114 char f_mntfromname[MNAMELEN];/* mounted filesystem */ 115 short f_spares2; /* unused spare */ 116 long f_spare[2]; /* unused spare */ 117 }; 118 119 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 120 121 /* 122 * bio_ops are associated with the mount structure and used in conjuction 123 * with the b_dep field in a buffer. Currently softupdates and HAMMER 124 * utilize this field. 125 * 126 * All bio_ops callbacks must be MPSAFE and could be called without 127 * the mplock. 128 */ 129 struct buf; 130 131 struct bio_ops { 132 TAILQ_ENTRY(bio_ops) entry; 133 void (*io_start) (struct buf *); 134 void (*io_complete) (struct buf *); 135 void (*io_deallocate) (struct buf *); 136 int (*io_fsync) (struct vnode *); 137 int (*io_sync) (struct mount *); 138 void (*io_movedeps) (struct buf *, struct buf *); 139 int (*io_countdeps) (struct buf *, int); 140 int (*io_checkread) (struct buf *); 141 int (*io_checkwrite) (struct buf *); 142 }; 143 144 #endif 145 146 /* 147 * vfs quota accounting 148 * 149 * uids and gids often come in contiguous blocks; use a small linear 150 * array as the basic in-memory accounting allocation unit 151 */ 152 #define ACCT_CHUNK_BITS 5 153 #define ACCT_CHUNK_NIDS (1<<ACCT_CHUNK_BITS) 154 #define ACCT_CHUNK_MASK (ACCT_CHUNK_NIDS - 1) 155 156 struct ac_counters { 157 uint64_t space; 158 uint64_t limit; 159 }; 160 161 struct ac_unode { 162 RB_ENTRY(ac_unode) rb_entry; 163 uid_t left_bits; 164 struct ac_counters uid_chunk[ACCT_CHUNK_NIDS]; 165 }; 166 167 struct ac_gnode { 168 RB_ENTRY(ac_gnode) rb_entry; 169 gid_t left_bits; 170 struct ac_counters gid_chunk[ACCT_CHUNK_NIDS]; 171 }; 172 173 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 174 175 struct vfs_acct { 176 RB_HEAD(ac_utree,ac_unode) ac_uroot; 177 RB_HEAD(ac_gtree,ac_gnode) ac_groot; 178 uint64_t ac_bytes; /* total bytes used */ 179 uint64_t ac_limit; 180 struct spinlock ac_spin; /* protective spinlock */ 181 }; 182 183 184 /* 185 * Structure per mounted file system. Each mounted file system has an 186 * array of operations and an instance record. The file systems are 187 * put on a doubly linked list. 188 * 189 * NOTE: mnt_nvnodelist and mnt_reservedvnlist. At the moment vnodes 190 * are linked into mnt_nvnodelist. At some point in the near future the 191 * vnode list will be split into a 'dirty' and 'clean' list. mnt_nvnodelist 192 * will become the dirty list and mnt_reservedvnlist will become the 'clean' 193 * list. Filesystem kld's syncing code should remain compatible since 194 * they only need to scan the dirty vnode list (nvnodelist -> dirtyvnodelist). 195 * 196 * NOTE: All VFSs must at least populate mnt_vn_ops or those VOP ops that 197 * only take namecache pointers will not be able to find their operations 198 * vector via namecache->nc_mount. 199 * 200 * MPSAFE NOTES: mnt_lock interlocks mounting and unmounting operations. 201 * 202 * mnt_token interlocks operations which adjust the mount 203 * structure and will also be held through VFS operations 204 * for VFSes not flagged MPSAFE. 205 * 206 * The VFS should pre-set VFCF_MPSAFE in the VFS_SET() to 207 * avoid use of the mplock during mounting. This will also 208 * cause MNTK_ALL_MPSAFE to be set in mnt_kern_flags. If the 209 * VFS does not set VFCF_MPSAFE then it can set individual 210 * MNTK_*_MPSAFE flags in mnt_kern_flags. 211 */ 212 TAILQ_HEAD(vnodelst, vnode); 213 TAILQ_HEAD(journallst, journal); 214 215 struct mount { 216 TAILQ_ENTRY(mount) mnt_list; /* mount list */ 217 struct vfsops *mnt_op; /* operations on fs */ 218 struct vfsconf *mnt_vfc; /* configuration info */ 219 u_int mnt_namecache_gen; /* ++ to clear negative hits */ 220 u_int mnt_pbuf_count; /* pbuf usage limit */ 221 struct vnode *mnt_syncer; /* syncer vnode */ 222 struct syncer_ctx *mnt_syncer_ctx; /* syncer process context */ 223 struct vnodelst mnt_nvnodelist; /* list of vnodes this mount */ 224 TAILQ_HEAD(,vmntvnodescan_info) mnt_vnodescan_list; 225 struct lock mnt_lock; /* mount structure lock */ 226 int mnt_flag; /* flags shared with user */ 227 int mnt_kern_flag; /* kernel only flags */ 228 int mnt_maxsymlinklen; /* max size of short symlink */ 229 struct statfs mnt_stat; /* cache of filesystem stats */ 230 struct statvfs mnt_vstat; /* extended stats */ 231 qaddr_t mnt_data; /* private data */ 232 time_t mnt_time; /* last time written*/ 233 u_int mnt_iosize_max; /* max IO request size */ 234 struct vnodelst mnt_reservedvnlist; /* (future) dirty vnode list */ 235 int mnt_nvnodelistsize; /* # of vnodes on this mount */ 236 237 /* 238 * ops vectors have a fixed stacking order. All primary calls run 239 * through mnt_vn_ops. This field is typically assigned to 240 * mnt_vn_norm_ops. If journaling has been enabled this field is 241 * usually assigned to mnt_vn_journal_ops. 242 */ 243 struct vop_ops *mnt_vn_use_ops; /* current ops set */ 244 245 struct vop_ops *mnt_vn_coherency_ops; /* cache coherency ops */ 246 struct vop_ops *mnt_vn_journal_ops; /* journaling ops */ 247 struct vop_ops *mnt_vn_norm_ops; /* for use by the VFS */ 248 struct vop_ops *mnt_vn_spec_ops; /* for use by the VFS */ 249 struct vop_ops *mnt_vn_fifo_ops; /* for use by the VFS */ 250 struct nchandle mnt_ncmountpt; /* mount point */ 251 struct nchandle mnt_ncmounton; /* mounted on */ 252 char mnt_pad[16]; /* (try to cache-align refs) */ 253 struct ucred *mnt_cred; /* for cr_prison */ 254 int mnt_refs; /* nchandle references */ 255 int mnt_hold; /* prevent kfree */ 256 struct lwkt_token mnt_token; /* token lock if not MPSAFE */ 257 struct journallst mnt_jlist; /* list of active journals */ 258 u_int8_t *mnt_jbitmap; /* streamid bitmap */ 259 int16_t mnt_streamid; /* last streamid */ 260 261 struct bio_ops *mnt_bioops; /* BIO ops (hammer, softupd) */ 262 struct lock mnt_renlock; /* rename directory lock */ 263 264 struct vfs_acct mnt_acct; /* vfs space accounting */ 265 RB_ENTRY(mount) mnt_node; /* mnt_stat.f_fsid */ 266 }; 267 268 #endif /* _KERNEL || _KERNEL_STRUCTURES */ 269 270 /* 271 * User specifiable flags. 272 */ 273 #define MNT_RDONLY 0x00000001 /* read only filesystem */ 274 #define MNT_SYNCHRONOUS 0x00000002 /* file system written synchronously */ 275 #define MNT_NOEXEC 0x00000004 /* can't exec from filesystem */ 276 #define MNT_NOSUID 0x00000008 /* don't honor setuid bits on fs */ 277 #define MNT_NODEV 0x00000010 /* don't interpret special files */ 278 #define MNT_AUTOMOUNTED 0x00000020 /* mounted by automountd(8) */ 279 #define MNT_ASYNC 0x00000040 /* file system written asynchronously */ 280 #define MNT_SUIDDIR 0x00100000 /* special handling of SUID on dirs */ 281 #define MNT_SOFTDEP 0x00200000 /* soft updates being done */ 282 #define MNT_NOSYMFOLLOW 0x00400000 /* do not follow symlinks */ 283 #define MNT_TRIM 0x01000000 /* Enable online FS trimming */ 284 #define MNT_NOATIME 0x10000000 /* disable update of file access time */ 285 #define MNT_NOCLUSTERR 0x40000000 /* disable cluster read */ 286 #define MNT_NOCLUSTERW 0x80000000 /* disable cluster write */ 287 288 /* 289 * NFS export related mount flags. 290 */ 291 #define MNT_EXRDONLY 0x00000080 /* exported read only */ 292 #define MNT_EXPORTED 0x00000100 /* file system is exported */ 293 #define MNT_DEFEXPORTED 0x00000200 /* exported to the world */ 294 #define MNT_EXPORTANON 0x00000400 /* use anon uid mapping for everyone */ 295 #define MNT_EXKERB 0x00000800 /* exported with Kerberos uid mapping */ 296 #define MNT_EXPUBLIC 0x20000000 /* public export (WebNFS) */ 297 298 /* 299 * Flags set by internal operations, 300 * but visible to the user. 301 * XXX some of these are not quite right.. (I've never seen the root flag set) 302 */ 303 #define MNT_LOCAL 0x00001000 /* filesystem is stored locally */ 304 #define MNT_QUOTA 0x00002000 /* quotas are enabled on filesystem */ 305 #define MNT_ROOTFS 0x00004000 /* identifies the root filesystem */ 306 #define MNT_USER 0x00008000 /* mounted by a user */ 307 #define MNT_IGNORE 0x00800000 /* do not show entry in df */ 308 309 /* 310 * Mask of flags that are visible to statfs() 311 * XXX I think that this could now become (~(MNT_CMDFLAGS)) 312 * but the 'mount' program may need changing to handle this. 313 */ 314 #define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \ 315 MNT_NOSUID | MNT_NODEV | \ 316 MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \ 317 MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \ 318 MNT_LOCAL | MNT_USER | MNT_QUOTA | \ 319 MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \ 320 MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \ 321 MNT_IGNORE | MNT_NOSYMFOLLOW | MNT_EXPUBLIC| \ 322 MNT_TRIM | MNT_AUTOMOUNTED) 323 /* 324 * External filesystem command modifier flags. 325 * Unmount can use the MNT_FORCE flag. 326 * XXX These are not STATES and really should be somewhere else. 327 */ 328 #define MNT_UPDATE 0x00010000 /* not a real mount, just an update */ 329 #define MNT_DELEXPORT 0x00020000 /* delete export host lists */ 330 #define MNT_RELOAD 0x00040000 /* reload filesystem data */ 331 #define MNT_FORCE 0x00080000 /* force unmount or readonly change */ 332 #define MNT_CMDFLAGS (MNT_UPDATE|MNT_DELEXPORT|MNT_RELOAD|MNT_FORCE) 333 /* 334 * Internal filesystem control flags stored in mnt_kern_flag. 335 * 336 * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed 337 * past the mount point. This keeps the subtree stable during mounts 338 * and unmounts. 339 * 340 * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while 341 * dounmount() is still waiting to lock the mountpoint. This allows 342 * the filesystem to cancel operations that might otherwise deadlock 343 * with the unmount attempt (used by NFS). 344 * 345 * MNTK_NOSTKMNT prevents mounting another filesystem inside the flagged one. 346 */ 347 #define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */ 348 #define MNTK_QUICKHALT 0x00008000 /* quick unmount on halt */ 349 #define MNTK_MPSAFE 0x00010000 /* call vops without mnt_token lock */ 350 #define MNTK_RD_MPSAFE 0x00020000 /* vop_read is MPSAFE */ 351 #define MNTK_WR_MPSAFE 0x00040000 /* vop_write is MPSAFE */ 352 #define MNTK_GA_MPSAFE 0x00080000 /* vop_getattr is MPSAFE */ 353 #define MNTK_IN_MPSAFE 0x00100000 /* vop_inactive is MPSAFE */ 354 #define MNTK_SG_MPSAFE 0x00200000 /* vop_strategy is MPSAFE */ 355 #define MNTK_NCALIASED 0x00800000 /* namecached aliased */ 356 #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */ 357 #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */ 358 #define MNTK_WANTRDWR 0x04000000 /* upgrade to read/write requested */ 359 #define MNTK_NOSTKMNT 0x10000000 /* no stacked mount point allowed */ 360 #define MNTK_NOMSYNC 0x20000000 /* used by tmpfs */ 361 #define MNTK_THR_SYNC 0x40000000 /* fs sync thread requested */ 362 #define MNTK_ST_MPSAFE 0x80000000 /* (mfs) vfs_start is MPSAFE */ 363 364 #define MNTK_ALL_MPSAFE (MNTK_MPSAFE | MNTK_RD_MPSAFE | MNTK_WR_MPSAFE | \ 365 MNTK_GA_MPSAFE | MNTK_IN_MPSAFE | MNTK_SG_MPSAFE | \ 366 MNTK_ST_MPSAFE) 367 368 /* 369 * mountlist_*() defines 370 */ 371 #define MNTSCAN_FORWARD 0x0001 372 #define MNTSCAN_REVERSE 0x0002 373 #define MNTSCAN_NOBUSY 0x0004 374 #define MNTSCAN_NOUNLOCK 0x0008 375 376 #define MNTINS_FIRST 0x0001 377 #define MNTINS_LAST 0x0002 378 379 /* 380 * Sysctl CTL_VFS definitions. 381 * 382 * Second level identifier specifies which filesystem. Second level 383 * identifier VFS_VFSCONF returns information about all filesystems. 384 * Second level identifier VFS_GENERIC is non-terminal. 385 */ 386 #define VFS_VFSCONF 0 /* get configured filesystems */ 387 #define VFS_GENERIC 0 /* generic filesystem information */ 388 /* 389 * Third level identifiers for VFS_GENERIC are given below; third 390 * level identifiers for specific filesystems are given in their 391 * mount specific header files. 392 */ 393 #define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */ 394 #define VFS_CONF 2 /* struct: vfsconf for filesystem given 395 as next argument */ 396 397 /* 398 * VFS MPLOCK helper. 399 * 400 * We have to cache the supplied mp because in certain situations 401 * the related vnode might go away across the use case (vop_strategy()). 402 */ 403 #define VFS_MPLOCK_DECLARE struct mount *xlock_mp 404 405 #define VFS_MPLOCK(mp) VFS_MPLOCK_FLAG(mp, MNTK_MPSAFE) 406 407 #define VFS_MPLOCK_FLAG(mp, flag) \ 408 do { \ 409 if (mp->mnt_kern_flag & flag) { \ 410 xlock_mp = NULL; \ 411 } else { \ 412 xlock_mp = (mp); \ 413 get_mplock(); /* TEMPORARY */ \ 414 lwkt_gettoken(&xlock_mp->mnt_token); \ 415 } \ 416 } while(0) 417 418 #define VFS_MPUNLOCK() \ 419 do { \ 420 if (xlock_mp) { \ 421 lwkt_reltoken(&xlock_mp->mnt_token); \ 422 rel_mplock(); /* TEMPORARY */ \ 423 } \ 424 } while(0) 425 426 /* 427 * Flags for various system call interfaces. 428 * 429 * waitfor flags to vfs_sync() and getfsstat() 430 */ 431 #define MNT_WAIT 0x0001 /* synchronously wait for I/O to complete */ 432 #define MNT_NOWAIT 0x0002 /* start all I/O, but do not wait for it */ 433 #define MNT_LAZY 0x0004 /* be lazy and do not necessarily push it all */ 434 435 #define VOP_FSYNC_SYSCALL 0x0001 /* from system call */ 436 437 /* 438 * Generic file handle 439 */ 440 struct fhandle { 441 fsid_t fh_fsid; /* File system id of mount point */ 442 struct fid fh_fid; /* File sys specific id */ 443 }; 444 typedef struct fhandle fhandle_t; 445 446 /* 447 * Export arguments for local filesystem mount calls. 448 */ 449 struct export_args { 450 int ex_flags; /* export related flags */ 451 uid_t ex_root; /* mapping for root uid */ 452 struct ucred ex_anon; /* mapping for anonymous user */ 453 struct sockaddr *ex_addr; /* net address to which exported */ 454 int ex_addrlen; /* and the net address length */ 455 struct sockaddr *ex_mask; /* mask of valid bits in saddr */ 456 int ex_masklen; /* and the smask length */ 457 char *ex_indexfile; /* index file for WebNFS URLs */ 458 }; 459 460 /* 461 * Structure holding information for a publicly exported filesystem 462 * (WebNFS). Currently the specs allow just for one such filesystem. 463 */ 464 struct nfs_public { 465 int np_valid; /* Do we hold valid information */ 466 fhandle_t np_handle; /* Filehandle for pub fs (internal) */ 467 struct mount *np_mount; /* Mountpoint of exported fs */ 468 char *np_index; /* Index file */ 469 }; 470 471 /* 472 * Filesystem configuration information. One of these exists for each 473 * type of filesystem supported by the kernel. These are searched at 474 * mount time to identify the requested filesystem. 475 */ 476 struct vfsconf { 477 struct vfsops *vfc_vfsops; /* filesystem operations vector */ 478 char vfc_name[MFSNAMELEN]; /* filesystem type name */ 479 int vfc_typenum; /* historic filesystem type number */ 480 int vfc_refcount; /* number mounted of this type */ 481 int vfc_flags; /* permanent flags */ 482 STAILQ_ENTRY(vfsconf) vfc_next; /* next in list */ 483 }; 484 485 struct ovfsconf { 486 void *vfc_vfsops; 487 char vfc_name[32]; 488 int vfc_index; 489 int vfc_refcount; 490 int vfc_flags; 491 }; 492 493 /* 494 * NB: these flags refer to IMPLEMENTATION properties, not properties of 495 * any actual mounts; i.e., it does not make sense to change the flags. 496 */ 497 #define VFCF_STATIC 0x00010000 /* statically compiled into kernel */ 498 #define VFCF_NETWORK 0x00020000 /* may get data over the network */ 499 #define VFCF_READONLY 0x00040000 /* writes are not implemented */ 500 #define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */ 501 #define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */ 502 #define VFCF_UNICODE 0x00200000 /* stores file names as Unicode*/ 503 #define VFCF_MPSAFE 0x00400000 /* VFS is fully MPSAFE */ 504 505 /* vfsquery flags */ 506 #define VQ_NOTRESP 0x0001 /* server down */ 507 #define VQ_NEEDAUTH 0x0002 /* server bad auth */ 508 #define VQ_LOWDISK 0x0004 /* we're low on space */ 509 #define VQ_MOUNT 0x0008 /* new filesystem arrived */ 510 #define VQ_UNMOUNT 0x0010 /* filesystem has left */ 511 #define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */ 512 #define VQ_ASSIST 0x0040 /* filesystem needs assistance from external 513 program */ 514 #define VQ_NOTRESPLOCK 0x0080 /* server lockd down */ 515 #define VQ_FLAG0100 0x0100 /* placeholder */ 516 #define VQ_FLAG0200 0x0200 /* placeholder */ 517 #define VQ_FLAG0400 0x0400 /* placeholder */ 518 #define VQ_FLAG0800 0x0800 /* placeholder */ 519 #define VQ_FLAG1000 0x1000 /* placeholder */ 520 #define VQ_FLAG2000 0x2000 /* placeholder */ 521 #define VQ_FLAG4000 0x4000 /* placeholder */ 522 #define VQ_FLAG8000 0x8000 /* placeholder */ 523 524 #ifdef _KERNEL 525 526 #ifdef MALLOC_DECLARE 527 MALLOC_DECLARE(M_MOUNT); 528 #endif 529 extern int nfs_mount_type; /* vfc_typenum for nfs, or -1 */ 530 531 struct vfsconf *vfsconf_find_by_name(const char *); 532 struct vfsconf *vfsconf_find_by_typenum(int); 533 int vfsconf_get_maxtypenum(void); 534 int vfsconf_each(int (*)(struct vfsconf *, void *), void *); 535 536 #endif 537 538 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 539 540 TAILQ_HEAD(mntlist, mount); /* struct mntlist */ 541 542 /* 543 * Operations supported on mounted file system. 544 */ 545 struct nlookupdata; 546 struct nlookupdata; 547 struct mbuf; 548 549 typedef int vfs_mount_t(struct mount *mp, char *path, caddr_t data, 550 struct ucred *cred); 551 typedef int vfs_start_t(struct mount *mp, int flags); 552 typedef int vfs_unmount_t(struct mount *mp, int mntflags); 553 typedef int vfs_root_t(struct mount *mp, struct vnode **vpp); 554 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, caddr_t arg, 555 struct ucred *cred); 556 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp, 557 struct ucred *cred); 558 typedef int vfs_statvfs_t(struct mount *mp, struct statvfs *sbp, 559 struct ucred *cred); 560 typedef int vfs_sync_t(struct mount *mp, int waitfor); 561 typedef int vfs_vget_t(struct mount *mp, struct vnode *dvp, 562 ino_t ino, struct vnode **vpp); 563 typedef int vfs_fhtovp_t(struct mount *mp, struct vnode *rootvp, 564 struct fid *fhp, struct vnode **vpp); 565 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam, 566 int *extflagsp, struct ucred **credanonp); 567 typedef int vfs_vptofh_t(struct vnode *vp, struct fid *fhp); 568 typedef int vfs_init_t(struct vfsconf *); 569 typedef int vfs_uninit_t(struct vfsconf *); 570 typedef int vfs_extattrctl_t(struct mount *mp, int cmd, struct vnode *vp, 571 int attrnamespace, const char *attrname, 572 struct ucred *cred); 573 typedef int vfs_acinit_t(struct mount *mp); 574 typedef void vfs_acdone_t(struct mount *mp); 575 typedef void vfs_account_t(struct mount *mp, 576 uid_t uid, gid_t gid, int64_t delta); 577 typedef void vfs_ncpgen_set_t(struct mount *mp, struct namecache *ncp); 578 typedef int vfs_ncpgen_test_t(struct mount *mp, struct namecache *ncp); 579 typedef int vfs_modifying_t(struct mount *mp); 580 581 int vfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred); 582 int vfs_start(struct mount *mp, int flags); 583 int vfs_unmount(struct mount *mp, int mntflags); 584 int vfs_root(struct mount *mp, struct vnode **vpp); 585 int vfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg, 586 struct ucred *cred); 587 int vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred); 588 int vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred); 589 int vfs_sync(struct mount *mp, int waitfor); 590 int vfs_vget(struct mount *mp, struct vnode *dvp, 591 ino_t ino, struct vnode **vpp); 592 int vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 593 struct fid *fhp, struct vnode **vpp); 594 int vfs_checkexp(struct mount *mp, struct sockaddr *nam, 595 int *extflagsp, struct ucred **credanonp); 596 int vfs_vptofh(struct vnode *vp, struct fid *fhp); 597 int vfs_init(struct vfsconf *vfc); 598 int vfs_uninit(struct vfsconf *vfc, struct vfsconf *vfsp); 599 int vfs_extattrctl(struct mount *mp, int cmd, struct vnode *vp, 600 int attrnamespace, const char *attrname, 601 struct ucred *cred); 602 int vfs_modifying(struct mount *mp); 603 604 struct vfsops { 605 long vfs_flags; 606 vfs_mount_t *vfs_mount; 607 vfs_start_t *vfs_start; 608 vfs_unmount_t *vfs_unmount; 609 vfs_root_t *vfs_root; 610 vfs_quotactl_t *vfs_quotactl; 611 vfs_statfs_t *vfs_statfs; 612 vfs_sync_t *vfs_sync; 613 vfs_vget_t *vfs_vget; 614 vfs_fhtovp_t *vfs_fhtovp; 615 vfs_checkexp_t *vfs_checkexp; 616 vfs_vptofh_t *vfs_vptofh; 617 vfs_init_t *vfs_init; 618 vfs_uninit_t *vfs_uninit; 619 vfs_extattrctl_t *vfs_extattrctl; 620 vfs_statvfs_t *vfs_statvfs; 621 vfs_acinit_t *vfs_acinit; 622 vfs_acdone_t *vfs_acdone; 623 vfs_account_t *vfs_account; 624 vfs_ncpgen_set_t *vfs_ncpgen_set; 625 vfs_ncpgen_test_t *vfs_ncpgen_test; 626 vfs_modifying_t *vfs_modifying; 627 }; 628 629 #define VFSOPSF_NOSYNCERTHR 0x00000001 630 631 #define VFS_MOUNT(MP, PATH, DATA, CRED) \ 632 vfs_mount(MP, PATH, DATA, CRED) 633 #define VFS_START(MP, FLAGS) \ 634 vfs_start(MP, FLAGS) 635 #define VFS_UNMOUNT(MP, FORCE) \ 636 vfs_unmount(MP, FORCE) 637 #define VFS_ROOT(MP, VPP) \ 638 vfs_root(MP, VPP) 639 #define VFS_QUOTACTL(MP, C, U, A, CRED) \ 640 vfs_quotactl(MP, C, U, A, CRED) 641 #define VFS_STATFS(MP, SBP, CRED) \ 642 vfs_statfs(MP, SBP, CRED) 643 #define VFS_STATVFS(MP, SBP, CRED) \ 644 vfs_statvfs(MP, SBP, CRED) 645 #define VFS_SYNC(MP, WAIT) \ 646 vfs_sync(MP, WAIT) 647 #define VFS_VGET(MP, DVP, INO, VPP) \ 648 vfs_vget(MP, DVP, INO, VPP) 649 #define VFS_FHTOVP(MP, ROOTVP, FIDP, VPP) \ 650 vfs_fhtovp(MP, ROOTVP, FIDP, VPP) 651 #define VFS_VPTOFH(VP, FIDP) \ 652 vfs_vptofh(VP, FIDP) 653 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \ 654 vfs_checkexp(MP, NAM, EXFLG, CRED) 655 #define VFS_EXTATTRCTL(MP, C, FVP, NS, N, CRED) \ 656 vfs_extattrctl(MP, C, FVP, NS, N, CRED) 657 #define VFS_ACCOUNT(MP, U, G, D) \ 658 if ((MP->mnt_op->vfs_account != NULL) && (D != 0)) \ 659 MP->mnt_op->vfs_account(MP, U, G, D); 660 #define VFS_ACINIT(MP, ERROR) \ 661 if (vfs_quota_enabled && MP->mnt_op->vfs_acinit != NULL) \ 662 ERROR = MP->mnt_op->vfs_acinit(MP); 663 #define VFS_ACDONE(MP) \ 664 if (vfs_quota_enabled && MP->mnt_op->vfs_acdone != NULL) \ 665 MP->mnt_op->vfs_acdone(MP); 666 #define VFS_NCPGEN_SET(MP, NCP) \ 667 MP->mnt_op->vfs_ncpgen_set(MP, NCP) 668 #define VFS_NCPGEN_TEST(MP, NCP) \ 669 MP->mnt_op->vfs_ncpgen_test(MP, NCP) 670 #define VFS_MODIFYING(MP) \ 671 MP->mnt_op->vfs_modifying(MP) 672 673 #endif 674 675 #ifdef _KERNEL 676 677 #include <sys/module.h> 678 679 #define VFS_SET(vfsops, fsname, flags) \ 680 static struct vfsconf fsname ## _vfsconf = { \ 681 &vfsops, \ 682 #fsname, \ 683 -1, \ 684 0, \ 685 flags, \ 686 { NULL }, \ 687 }; \ 688 static moduledata_t fsname ## _mod = { \ 689 #fsname, \ 690 vfs_modevent, \ 691 & fsname ## _vfsconf \ 692 }; \ 693 DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE) 694 695 #endif 696 697 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 698 699 #include <net/radix.h> 700 701 #define AF_MAX 36 /* XXX */ 702 703 /* 704 * Network address lookup element 705 */ 706 struct netcred { 707 struct radix_node netc_rnodes[2]; 708 int netc_exflags; 709 struct ucred netc_anon; 710 }; 711 712 /* 713 * Network export information 714 */ 715 struct netexport { 716 struct netcred ne_defexported; /* Default export */ 717 struct radix_node_head *ne_inethead; /* IPv4 radix */ 718 struct radix_node_head *ne_inet6head; /* IPv6 radix */ 719 struct radix_node_head *ne_maskhead; /* Shared mask radix */ 720 }; 721 #define NE_LOCK(nep) lwkt_getpooltoken(nep) 722 #define NE_UNLOCK(nep) lwkt_relpooltoken(nep) 723 #define NE_ASSERT_LOCKED(nep) \ 724 ASSERT_LWKT_TOKEN_HELD(lwkt_token_pool_lookup(nep)) 725 726 #endif 727 728 #ifdef _KERNEL 729 /* 730 * exported vnode operations 731 */ 732 void mount_hold(struct mount *); 733 void mount_drop(struct mount *); 734 int dounmount (struct mount *, int, int); 735 int vfs_setpublicfs /* set publicly exported fs */ 736 (struct mount *, struct netexport *, const struct export_args *); 737 int vfs_lock (struct mount *); /* lock a vfs */ 738 void vfs_msync (struct mount *, int); 739 void vfs_unlock (struct mount *); /* unlock a vfs */ 740 int vfs_busy (struct mount *, int); 741 int vfs_export /* process mount export info */ 742 (struct mount *, struct netexport *, const struct export_args *); 743 struct netcred *vfs_export_lookup /* lookup host in fs export list */ 744 (struct mount *, struct netexport *, struct sockaddr *); 745 int vfs_allocate_syncvnode (struct mount *); 746 void vfs_getnewfsid (struct mount *); 747 void vfs_setfsid(struct mount *mp, fsid_t *template); 748 cdev_t vfs_getrootfsid (struct mount *); 749 struct mount *vfs_getvfs (fsid_t *); /* return vfs given fsid */ 750 int vfs_modevent (module_t, int, void *); 751 int vfs_mountedon (struct vnode *); /* is a vfs mounted on vp */ 752 int vfs_rootmountalloc (char *, char *, struct mount **); 753 void vfs_unbusy (struct mount *); 754 void vfs_unmountall (int halting); 755 int vfs_register (struct vfsconf *); 756 int vfs_unregister (struct vfsconf *); 757 extern struct nfs_public nfs_pub; 758 759 /* 760 * Declarations for these vfs default operations are located in 761 * kern/vfs_default.c, they should be used instead of making "dummy" 762 * functions or casting entries in the VFS op table to "enopnotsupp()". 763 */ 764 vfs_start_t vfs_stdstart; 765 vfs_root_t vfs_stdroot; 766 vfs_quotactl_t vfs_stdquotactl; 767 vfs_statfs_t vfs_stdstatfs; 768 vfs_statvfs_t vfs_stdstatvfs; 769 vfs_sync_t vfs_stdsync; 770 vfs_sync_t vfs_stdnosync; 771 vfs_vget_t vfs_stdvget; 772 vfs_fhtovp_t vfs_stdfhtovp; 773 vfs_checkexp_t vfs_stdcheckexp; 774 vfs_vptofh_t vfs_stdvptofh; 775 vfs_init_t vfs_stdinit; 776 vfs_uninit_t vfs_stduninit; 777 vfs_extattrctl_t vfs_stdextattrctl; 778 vfs_acinit_t vfs_stdac_init; 779 vfs_acdone_t vfs_stdac_done; 780 vfs_account_t vfs_stdaccount; 781 vfs_account_t vfs_noaccount; 782 vfs_ncpgen_set_t vfs_stdncpgen_set; 783 vfs_ncpgen_test_t vfs_stdncpgen_test; 784 vfs_modifying_t vfs_stdmodifying; 785 786 struct vop_access_args; 787 int vop_helper_access(struct vop_access_args *ap, uid_t ino_uid, gid_t ino_gid, 788 mode_t ino_mode, u_int32_t ino_flags); 789 int vop_helper_setattr_flags(u_int32_t *ino_flags, u_int32_t vaflags, 790 uid_t uid, struct ucred *cred); 791 uid_t vop_helper_create_uid(struct mount *mp, mode_t dmode, uid_t duid, 792 struct ucred *cred, mode_t *modep); 793 int vop_helper_chmod(struct vnode *vp, mode_t new_mode, struct ucred *cred, 794 uid_t cur_uid, gid_t cur_gid, mode_t *cur_modep); 795 int vop_helper_chown(struct vnode *vp, uid_t new_uid, gid_t new_gid, 796 struct ucred *cred, 797 uid_t *cur_uidp, gid_t *cur_gidp, mode_t *cur_modep); 798 int vop_helper_read_shortcut(struct vop_read_args *ap); 799 800 void add_bio_ops(struct bio_ops *ops); 801 void rem_bio_ops(struct bio_ops *ops); 802 803 int journal_mountctl(struct vop_mountctl_args *ap); 804 void journal_remove_all_journals(struct mount *mp, int flags); 805 806 void mountlist_insert(struct mount *, int); 807 int mountlist_interlock(int (*callback)(struct mount *), struct mount *); 808 struct mount *mountlist_boot_getfirst(void); 809 void mountlist_remove(struct mount *mp); 810 int mountlist_exists(struct mount *mp); 811 int mountlist_scan(int (*callback)(struct mount *, void *), void *, int); 812 struct mount *mount_get_by_nc(struct namecache *ncp); 813 #else /* !_KERNEL */ 814 815 #include <sys/cdefs.h> 816 817 __BEGIN_DECLS 818 int fstatfs (int, struct statfs *); 819 int getfh (const char *, fhandle_t *); 820 int getfsstat (struct statfs *, long, int); 821 int getmntinfo (struct statfs **, int); 822 int getmntvinfo (struct statfs **, struct statvfs **, int); 823 int mount (const char *, const char *, int, void *); 824 int statfs (const char *, struct statfs *); 825 int unmount (const char *, int); 826 int fhopen (const struct fhandle *, int); 827 int fhstat (const struct fhandle *, struct stat *); 828 int fhstatfs (const struct fhandle *, struct statfs *); 829 830 /* C library stuff */ 831 void endvfsent (void); 832 struct ovfsconf *getvfsbyname (const char *); 833 struct ovfsconf *getvfsbytype (int); 834 struct ovfsconf *getvfsent (void); 835 #define getvfsbyname new_getvfsbyname 836 int new_getvfsbyname (const char *, struct vfsconf *); 837 void setvfsent (int); 838 int vfsisloadable (const char *); 839 int vfsload (const char *); 840 __END_DECLS 841 842 #endif /* _KERNEL */ 843 844 #endif /* !_SYS_MOUNT_H_ */ 845 846