Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/sys/mount.h
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1 /* $NetBSD: mount.h,v 1.181 2008/07/31 05:38:05 simonb Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)mount.h 8.21 (Berkeley) 5/20/95 32 */ 33 34 #ifndef _SYS_MOUNT_H_ 35 #define _SYS_MOUNT_H_ 36 37 #ifndef _KERNEL 38 #include <sys/featuretest.h> 39 #if defined(_NETBSD_SOURCE) 40 #include <sys/stat.h> 41 #endif /* _NETBSD_SOURCE */ 42 #endif 43 44 #ifndef _STANDALONE 45 #include <sys/ucred.h> 46 #include <sys/fstypes.h> 47 #include <sys/queue.h> 48 #include <sys/rwlock.h> 49 #include <sys/statvfs.h> 50 #include <sys/specificdata.h> 51 #include <sys/condvar.h> 52 #endif /* !_STANDALONE */ 53 54 /* 55 * file system statistics 56 */ 57 58 #define MNAMELEN 90 /* length of buffer for returned name */ 59 60 /* 61 * File system types. 62 */ 63 #define MOUNT_FFS "ffs" /* UNIX "Fast" Filesystem */ 64 #define MOUNT_UFS MOUNT_FFS /* for compatibility */ 65 #define MOUNT_NFS "nfs" /* Network Filesystem */ 66 #define MOUNT_MFS "mfs" /* Memory Filesystem */ 67 #define MOUNT_MSDOS "msdos" /* MSDOS Filesystem */ 68 #define MOUNT_LFS "lfs" /* Log-based Filesystem */ 69 #define MOUNT_FDESC "fdesc" /* File Descriptor Filesystem */ 70 #define MOUNT_PORTAL "portal" /* Portal Filesystem */ 71 #define MOUNT_NULL "null" /* Minimal Filesystem Layer */ 72 #define MOUNT_OVERLAY "overlay" /* Minimal Overlay Filesystem Layer */ 73 #define MOUNT_UMAP "umap" /* User/Group Identifier Remapping Filesystem */ 74 #define MOUNT_KERNFS "kernfs" /* Kernel Information Filesystem */ 75 #define MOUNT_PROCFS "procfs" /* /proc Filesystem */ 76 #define MOUNT_AFS "afs" /* Andrew Filesystem */ 77 #define MOUNT_CD9660 "cd9660" /* ISO9660 (aka CDROM) Filesystem */ 78 #define MOUNT_UNION "union" /* Union (translucent) Filesystem */ 79 #define MOUNT_ADOSFS "adosfs" /* AmigaDOS Filesystem */ 80 #define MOUNT_EXT2FS "ext2fs" /* Second Extended Filesystem */ 81 #define MOUNT_CFS "coda" /* Coda Filesystem */ 82 #define MOUNT_CODA MOUNT_CFS /* Coda Filesystem */ 83 #define MOUNT_FILECORE "filecore" /* Acorn Filecore Filesystem */ 84 #define MOUNT_NTFS "ntfs" /* Windows/NT Filesystem */ 85 #define MOUNT_SMBFS "smbfs" /* CIFS (SMB) */ 86 #define MOUNT_PTYFS "ptyfs" /* Pseudo tty filesystem */ 87 #define MOUNT_TMPFS "tmpfs" /* Efficient memory file-system */ 88 #define MOUNT_UDF "udf" /* UDF CD/DVD filesystem */ 89 #define MOUNT_SYSVBFS "sysvbfs" /* System V Boot Filesystem */ 90 #define MOUNT_PUFFS "puffs" /* Pass-to-Userspace filesystem */ 91 #define MOUNT_HFS "hfs" /* Apple HFS+ Filesystem */ 92 #define MOUNT_EFS "efs" /* SGI's Extent Filesystem */ 93 #define MOUNT_ZFS "zfs" /* Sun ZFS */ 94 95 #ifndef _STANDALONE 96 97 struct vnode; 98 99 /* 100 * Structure per mounted file system. Each mounted file system has an 101 * array of operations and an instance record. The file systems are 102 * put on a doubly linked list. 103 */ 104 struct mount { 105 CIRCLEQ_ENTRY(mount) mnt_list; /* mount list */ 106 TAILQ_HEAD(, vnode) mnt_vnodelist; /* list of vnodes this mount */ 107 struct vfsops *mnt_op; /* operations on fs */ 108 struct vnode *mnt_vnodecovered; /* vnode we mounted on */ 109 struct vnode *mnt_syncer; /* syncer vnode */ 110 void *mnt_transinfo; /* for FS-internal use */ 111 void *mnt_data; /* private data */ 112 krwlock_t mnt_unmounting; /* to prevent new activity */ 113 kmutex_t mnt_renamelock; /* per-fs rename lock */ 114 int mnt_refcnt; /* ref count on this structure */ 115 int mnt_recursecnt; /* count of write locks */ 116 int mnt_flag; /* flags */ 117 int mnt_iflag; /* internal flags */ 118 int mnt_fs_bshift; /* offset shift for lblkno */ 119 int mnt_dev_bshift; /* shift for device sectors */ 120 struct statvfs mnt_stat; /* cache of filesystem stats */ 121 specificdata_reference 122 mnt_specdataref; /* subsystem specific data */ 123 kmutex_t mnt_updating; /* to serialize updates */ 124 struct wapbl_ops 125 *mnt_wapbl_op; /* logging ops */ 126 struct wapbl *mnt_wapbl; /* log info */ 127 struct wapbl_replay 128 *mnt_wapbl_replay; /* replay support XXX: what? */ 129 }; 130 131 /* 132 * Sysctl CTL_VFS definitions. 133 * 134 * Second level identifier specifies which filesystem. Second level 135 * identifier VFS_GENERIC returns information about all filesystems. 136 * 137 * Note the slightly non-flat nature of these sysctl numbers. Oh for 138 * a better sysctl interface. 139 */ 140 #define VFS_GENERIC 0 /* generic filesystem information */ 141 #define VFS_MAXTYPENUM 1 /* int: highest defined fs type */ 142 #define VFS_CONF 2 /* struct: vfsconf for filesystem given 143 as next argument */ 144 #define VFS_USERMOUNT 3 /* enable/disable fs mnt by non-root */ 145 #define VFS_MAGICLINKS 4 /* expand 'magic' symlinks */ 146 #define VFSGEN_MAXID 5 /* number of valid vfs.generic ids */ 147 148 /* 149 * USE THE SAME NAMES AS MOUNT_*! 150 * 151 * Only need to add new entry here if the filesystem actually supports 152 * sysctl(2). 153 */ 154 #define CTL_VFS_NAMES { \ 155 { "generic", CTLTYPE_NODE }, \ 156 { MOUNT_FFS, CTLTYPE_NODE }, \ 157 { MOUNT_NFS, CTLTYPE_NODE }, \ 158 { MOUNT_MFS, CTLTYPE_NODE }, \ 159 { MOUNT_MSDOS, CTLTYPE_NODE }, \ 160 { MOUNT_LFS, CTLTYPE_NODE }, \ 161 { 0, 0 }, /* MOUNT_LOFS */ \ 162 { MOUNT_FDESC, CTLTYPE_NODE }, \ 163 { MOUNT_PORTAL, CTLTYPE_NODE }, \ 164 { MOUNT_NULL, CTLTYPE_NODE }, \ 165 { MOUNT_UMAP, CTLTYPE_NODE }, \ 166 { MOUNT_KERNFS, CTLTYPE_NODE }, \ 167 { MOUNT_PROCFS, CTLTYPE_NODE }, \ 168 { MOUNT_AFS, CTLTYPE_NODE }, \ 169 { MOUNT_CD9660, CTLTYPE_NODE }, \ 170 { MOUNT_UNION, CTLTYPE_NODE }, \ 171 { MOUNT_ADOSFS, CTLTYPE_NODE }, \ 172 { MOUNT_EXT2FS, CTLTYPE_NODE }, \ 173 { MOUNT_CODA, CTLTYPE_NODE }, \ 174 { MOUNT_FILECORE, CTLTYPE_NODE }, \ 175 { MOUNT_NTFS, CTLTYPE_NODE }, \ 176 } 177 178 #define VFS_MAXID 20 /* number of valid vfs ids */ 179 180 #define CTL_VFSGENCTL_NAMES { \ 181 { 0, 0 }, \ 182 { "maxtypenum", CTLTYPE_INT }, \ 183 { "conf", CTLTYPE_NODE }, /* Special */ \ 184 { "usermount", CTLTYPE_INT }, \ 185 { "magiclinks", CTLTYPE_INT }, \ 186 } 187 188 #if defined(_KERNEL) 189 #if __STDC__ 190 struct nameidata; 191 #endif 192 193 /* 194 * Operations supported on mounted file system. 195 */ 196 197 struct vfsops { 198 const char *vfs_name; 199 size_t vfs_min_mount_data; 200 int (*vfs_mount) (struct mount *, const char *, void *, 201 size_t *); 202 int (*vfs_start) (struct mount *, int); 203 int (*vfs_unmount) (struct mount *, int); 204 int (*vfs_root) (struct mount *, struct vnode **); 205 int (*vfs_quotactl) (struct mount *, int, uid_t, void *); 206 int (*vfs_statvfs) (struct mount *, struct statvfs *); 207 int (*vfs_sync) (struct mount *, int, struct kauth_cred *); 208 int (*vfs_vget) (struct mount *, ino_t, struct vnode **); 209 int (*vfs_fhtovp) (struct mount *, struct fid *, 210 struct vnode **); 211 int (*vfs_vptofh) (struct vnode *, struct fid *, size_t *); 212 void (*vfs_init) (void); 213 void (*vfs_reinit) (void); 214 void (*vfs_done) (void); 215 int (*vfs_mountroot)(void); 216 int (*vfs_snapshot) (struct mount *, struct vnode *, 217 struct timespec *); 218 int (*vfs_extattrctl) (struct mount *, int, 219 struct vnode *, int, const char *); 220 int (*vfs_suspendctl) (struct mount *, int); 221 int (*vfs_renamelock_enter)(struct mount *); 222 void (*vfs_renamelock_exit)(struct mount *); 223 int (*vfs_fsync) (struct vnode *, int); 224 const struct vnodeopv_desc * const *vfs_opv_descs; 225 int vfs_refcount; 226 LIST_ENTRY(vfsops) vfs_list; 227 }; 228 229 /* XXX vget is actually file system internal. */ 230 #define VFS_VGET(MP, INO, VPP) (*(MP)->mnt_op->vfs_vget)(MP, INO, VPP) 231 232 #define VFS_RENAMELOCK_ENTER(MP) (*(MP)->mnt_op->vfs_renamelock_enter)(MP) 233 #define VFS_RENAMELOCK_EXIT(MP) (*(MP)->mnt_op->vfs_renamelock_exit)(MP) 234 #define VFS_FSYNC(MP, VP, FLG) (*(MP)->mnt_op->vfs_fsync)(VP, FLG) 235 236 int VFS_MOUNT(struct mount *, const char *, void *, size_t *); 237 int VFS_START(struct mount *, int); 238 int VFS_UNMOUNT(struct mount *, int); 239 int VFS_ROOT(struct mount *, struct vnode **); 240 int VFS_QUOTACTL(struct mount *, int, uid_t, void *); 241 int VFS_STATVFS(struct mount *, struct statvfs *); 242 int VFS_SYNC(struct mount *, int, struct kauth_cred *); 243 int VFS_FHTOVP(struct mount *, struct fid *, struct vnode **); 244 int VFS_VPTOFH(struct vnode *, struct fid *, size_t *); 245 void VFS_INIT(void); 246 void VFS_REINIT(void); 247 void VFS_DONE(void); 248 int VFS_MOUNTROOT(void); 249 int VFS_SNAPSHOT(struct mount *, struct vnode *, struct timespec *); 250 int VFS_EXTATTRCTL(struct mount *, int, struct vnode *, int, const char *); 251 int VFS_SUSPENDCTL(struct mount *, int); 252 253 #endif /* _KERNEL */ 254 255 #ifdef _KERNEL 256 #if __STDC__ 257 struct mbuf; 258 struct vnodeopv_desc; 259 struct kauth_cred; 260 #endif 261 262 #define VFS_MAX_MOUNT_DATA 8192 263 264 #define VFS_PROTOS(fsname) \ 265 int fsname##_mount(struct mount *, const char *, void *, \ 266 size_t *); \ 267 int fsname##_start(struct mount *, int); \ 268 int fsname##_unmount(struct mount *, int); \ 269 int fsname##_root(struct mount *, struct vnode **); \ 270 int fsname##_quotactl(struct mount *, int, uid_t, void *); \ 271 int fsname##_statvfs(struct mount *, struct statvfs *); \ 272 int fsname##_sync(struct mount *, int, struct kauth_cred *); \ 273 int fsname##_vget(struct mount *, ino_t, struct vnode **); \ 274 int fsname##_fhtovp(struct mount *, struct fid *, struct vnode **); \ 275 int fsname##_vptofh(struct vnode *, struct fid *, size_t *); \ 276 void fsname##_init(void); \ 277 void fsname##_reinit(void); \ 278 void fsname##_done(void); \ 279 int fsname##_mountroot(void); \ 280 int fsname##_snapshot(struct mount *, struct vnode *, \ 281 struct timespec *); \ 282 int fsname##_extattrctl(struct mount *, int, struct vnode *, int, \ 283 const char *); \ 284 int fsname##_suspendctl(struct mount *, int) 285 286 /* 287 * This operations vector is so wapbl can be wrapped into a filesystem lkm. 288 * XXX Eventually, we want to move this functionality 289 * down into the filesystems themselves so that this isn't needed. 290 */ 291 struct wapbl_ops { 292 void (*wo_wapbl_discard)(struct wapbl *); 293 int (*wo_wapbl_replay_isopen)(struct wapbl_replay *); 294 int (*wo_wapbl_replay_read)(struct wapbl_replay *, void *, daddr_t, long); 295 void (*wo_wapbl_add_buf)(struct wapbl *, struct buf *); 296 void (*wo_wapbl_remove_buf)(struct wapbl *, struct buf *); 297 void (*wo_wapbl_resize_buf)(struct wapbl *, struct buf *, long, long); 298 int (*wo_wapbl_begin)(struct wapbl *, const char *, int); 299 void (*wo_wapbl_end)(struct wapbl *); 300 void (*wo_wapbl_junlock_assert)(struct wapbl *); 301 void (*wo_wapbl_biodone)(struct buf *); 302 }; 303 #define WAPBL_DISCARD(MP) \ 304 (*(MP)->mnt_wapbl_op->wo_wapbl_discard)((MP)->mnt_wapbl) 305 #define WAPBL_REPLAY_ISOPEN(MP) \ 306 (*(MP)->mnt_wapbl_op->wo_wapbl_replay_isopen)((MP)->mnt_wapbl_replay) 307 #define WAPBL_REPLAY_READ(MP, DATA, BLK, LEN) \ 308 (*(MP)->mnt_wapbl_op->wo_wapbl_replay_read)((MP)->mnt_wapbl_replay, \ 309 (DATA), (BLK), (LEN)) 310 #define WAPBL_ADD_BUF(MP, BP) \ 311 (*(MP)->mnt_wapbl_op->wo_wapbl_add_buf)((MP)->mnt_wapbl, (BP)) 312 #define WAPBL_REMOVE_BUF(MP, BP) \ 313 (*(MP)->mnt_wapbl_op->wo_wapbl_remove_buf)((MP)->mnt_wapbl, (BP)) 314 #define WAPBL_RESIZE_BUF(MP, BP, OLDSZ, OLDCNT) \ 315 (*(MP)->mnt_wapbl_op->wo_wapbl_resize_buf)((MP)->mnt_wapbl, (BP), \ 316 (OLDSZ), (OLDCNT)) 317 #define WAPBL_BEGIN(MP) \ 318 (*(MP)->mnt_wapbl_op->wo_wapbl_begin)((MP)->mnt_wapbl, \ 319 __FILE__, __LINE__) 320 #define WAPBL_END(MP) \ 321 (*(MP)->mnt_wapbl_op->wo_wapbl_end)((MP)->mnt_wapbl) 322 #define WAPBL_JUNLOCK_ASSERT(MP) \ 323 (*(MP)->mnt_wapbl_op->wo_wapbl_junlock_assert)((MP)->mnt_wapbl) 324 325 struct vfs_hooks { 326 void (*vh_unmount)(struct mount *); 327 LIST_ENTRY(vfs_hooks) vfs_hooks_list; 328 }; 329 330 void vfs_hooks_init(void); 331 int vfs_hooks_attach(struct vfs_hooks *); 332 int vfs_hooks_detach(struct vfs_hooks *); 333 void vfs_hooks_unmount(struct mount *); 334 335 #endif /* _KERNEL */ 336 337 /* 338 * Export arguments for local filesystem mount calls. 339 * 340 * This structure is deprecated and is only provided for compatibility 341 * reasons with old binary utilities; several file systems expose an 342 * instance of this structure in their mount arguments structure, thus 343 * needing a padding in place of the old values. This definition cannot 344 * change in the future due to this reason. 345 * XXX: This should be moved to the compat subtree but cannot be done 346 * until we can move the mount args structures themselves. 347 * 348 * The current export_args structure can be found in nfs/nfs.h. 349 */ 350 struct export_args30 { 351 int ex_flags; /* export related flags */ 352 uid_t ex_root; /* mapping for root uid */ 353 struct uucred ex_anon; /* mapping for anonymous user */ 354 struct sockaddr *ex_addr; /* net address to which exported */ 355 int ex_addrlen; /* and the net address length */ 356 struct sockaddr *ex_mask; /* mask of valid bits in saddr */ 357 int ex_masklen; /* and the smask length */ 358 char *ex_indexfile; /* index file for WebNFS URLs */ 359 }; 360 361 struct mnt_export_args30 { 362 const char *fspec; /* Always NULL */ 363 struct export_args30 eargs; 364 }; 365 366 #ifdef _KERNEL 367 #include <sys/mallocvar.h> 368 MALLOC_DECLARE(M_MOUNT); 369 370 /* 371 * exported VFS interface (see vfssubr(9)) 372 */ 373 struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */ 374 int vfs_composefh(struct vnode *, fhandle_t *, size_t *); 375 int vfs_composefh_alloc(struct vnode *, fhandle_t **); 376 void vfs_composefh_free(fhandle_t *); 377 int vfs_fhtovp(fhandle_t *, struct vnode **); 378 int vfs_mountedon(struct vnode *);/* is a vfs mounted on vp */ 379 int vfs_mountroot(void); 380 void vfs_shutdown(void); /* unmount and sync file systems */ 381 void vfs_unmountall(struct lwp *); /* unmount file systems */ 382 int vfs_busy(struct mount *, struct mount **); 383 int vfs_rootmountalloc(const char *, const char *, struct mount **); 384 void vfs_unbusy(struct mount *, bool, struct mount **); 385 int vfs_attach(struct vfsops *); 386 int vfs_detach(struct vfsops *); 387 void vfs_reinit(void); 388 struct vfsops *vfs_getopsbyname(const char *); 389 void vfs_delref(struct vfsops *); 390 void vfs_destroy(struct mount *); 391 void vfs_scrubvnlist(struct mount *); 392 393 int vfs_stdextattrctl(struct mount *, int, struct vnode *, 394 int, const char *); 395 396 extern CIRCLEQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */ 397 extern struct vfsops *vfssw[]; /* filesystem type table */ 398 extern int nvfssw; 399 extern kmutex_t mountlist_lock; 400 extern kmutex_t vfs_list_lock; 401 402 long makefstype(const char *); 403 int dounmount(struct mount *, int, struct lwp *); 404 int do_sys_mount(struct lwp *, struct vfsops *, const char *, const char *, 405 int, void *, enum uio_seg, size_t, register_t *); 406 void vfsinit(void); 407 void vfs_opv_init(const struct vnodeopv_desc * const *); 408 void vfs_opv_free(const struct vnodeopv_desc * const *); 409 #ifdef DEBUG 410 void vfs_bufstats(void); 411 #endif 412 413 int mount_specific_key_create(specificdata_key_t *, specificdata_dtor_t); 414 void mount_specific_key_delete(specificdata_key_t); 415 void mount_initspecific(struct mount *); 416 void mount_finispecific(struct mount *); 417 void * mount_getspecific(struct mount *, specificdata_key_t); 418 void mount_setspecific(struct mount *, specificdata_key_t, void *); 419 420 LIST_HEAD(vfs_list_head, vfsops); 421 extern struct vfs_list_head vfs_list; 422 423 #else /* _KERNEL */ 424 425 #include <sys/cdefs.h> 426 427 __BEGIN_DECLS 428 #if !defined(__LIBC12_SOURCE__) && !defined(_STANDALONE) 429 int getfh(const char *, void *, size_t *) 430 __RENAME(__getfh30); 431 #endif 432 433 int unmount(const char *, int); 434 #if defined(_NETBSD_SOURCE) 435 #ifndef __LIBC12_SOURCE__ 436 int mount(const char *, const char *, int, void *, size_t) __RENAME(__mount50); 437 int fhopen(const void *, size_t, int) __RENAME(__fhopen40); 438 int fhstat(const void *, size_t, struct stat *) __RENAME(__fhstat40); 439 #endif 440 #endif /* _NETBSD_SOURCE */ 441 __END_DECLS 442 443 #endif /* _KERNEL */ 444 #endif /* !_STANDALONE */ 445 446 #endif /* !_SYS_MOUNT_H_ */
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