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 1.151 2006/11/17 17:05:18 hannken 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 #include <sys/ucred.h> 40 #if defined(_NETBSD_SOURCE) 41 #include <sys/stat.h> 42 #endif /* _NETBSD_SOURCE */ 43 #endif 44 #include <sys/fstypes.h> 45 #include <sys/queue.h> 46 #include <sys/lock.h> 47 #include <sys/statvfs.h> 48 #include <sys/specificdata.h> 49 50 /* 51 * file system statistics 52 */ 53 54 #define MFSNAMELEN 16 /* length of fs type name, including nul */ 55 #define MNAMELEN 90 /* length of buffer for returned name */ 56 57 /* 58 * File system types. 59 */ 60 #define MOUNT_FFS "ffs" /* UNIX "Fast" Filesystem */ 61 #define MOUNT_UFS MOUNT_FFS /* for compatibility */ 62 #define MOUNT_NFS "nfs" /* Network Filesystem */ 63 #define MOUNT_MFS "mfs" /* Memory Filesystem */ 64 #define MOUNT_MSDOS "msdos" /* MSDOS Filesystem */ 65 #define MOUNT_LFS "lfs" /* Log-based Filesystem */ 66 #define MOUNT_FDESC "fdesc" /* File Descriptor Filesystem */ 67 #define MOUNT_PORTAL "portal" /* Portal Filesystem */ 68 #define MOUNT_NULL "null" /* Minimal Filesystem Layer */ 69 #define MOUNT_OVERLAY "overlay" /* Minimal Overlay Filesystem Layer */ 70 #define MOUNT_UMAP "umap" /* User/Group Identifier Remapping Filesystem */ 71 #define MOUNT_KERNFS "kernfs" /* Kernel Information Filesystem */ 72 #define MOUNT_PROCFS "procfs" /* /proc Filesystem */ 73 #define MOUNT_AFS "afs" /* Andrew Filesystem */ 74 #define MOUNT_CD9660 "cd9660" /* ISO9660 (aka CDROM) Filesystem */ 75 #define MOUNT_UNION "union" /* Union (translucent) Filesystem */ 76 #define MOUNT_ADOSFS "adosfs" /* AmigaDOS Filesystem */ 77 #define MOUNT_EXT2FS "ext2fs" /* Second Extended Filesystem */ 78 #define MOUNT_CFS "coda" /* Coda Filesystem */ 79 #define MOUNT_CODA MOUNT_CFS /* Coda Filesystem */ 80 #define MOUNT_FILECORE "filecore" /* Acorn Filecore Filesystem */ 81 #define MOUNT_NTFS "ntfs" /* Windows/NT Filesystem */ 82 #define MOUNT_SMBFS "smbfs" /* CIFS (SMB) */ 83 #define MOUNT_PTYFS "ptyfs" /* Pseudo tty filesystem */ 84 #define MOUNT_TMPFS "tmpfs" /* Efficient memory file-system */ 85 #define MOUNT_UDF "udf" /* UDF CD/DVD filesystem */ 86 #define MOUNT_SYSVBFS "sysvbfs" /* System V Boot Filesystem */ 87 #define MOUNT_PUFFS "puffs" /* Pass-to-Userspace filesystem */ 88 89 /* 90 * Structure per mounted file system. Each mounted file system has an 91 * array of operations and an instance record. The file systems are 92 * put on a doubly linked list. 93 */ 94 TAILQ_HEAD(vnodelst, vnode); 95 96 struct mount { 97 CIRCLEQ_ENTRY(mount) mnt_list; /* mount list */ 98 struct vfsops *mnt_op; /* operations on fs */ 99 struct vnode *mnt_vnodecovered; /* vnode we mounted on */ 100 struct vnode *mnt_syncer; /* syncer vnode */ 101 struct vnodelst mnt_vnodelist; /* list of vnodes this mount */ 102 struct lock mnt_lock; /* mount structure lock */ 103 int mnt_flag; /* flags */ 104 int mnt_iflag; /* internal flags */ 105 int mnt_fs_bshift; /* offset shift for lblkno */ 106 int mnt_dev_bshift; /* shift for device sectors */ 107 struct statvfs mnt_stat; /* cache of filesystem stats */ 108 void *mnt_data; /* private data */ 109 int mnt_wcnt; /* count of vfs_busy waiters */ 110 struct lwp *mnt_unmounter; /* who is unmounting */ 111 int mnt_writeopcountupper; /* upper writeops in progress */ 112 int mnt_writeopcountlower; /* lower writeops in progress */ 113 struct simplelock mnt_slock; /* mutex for wcnt and 114 writeops counters */ 115 struct mount *mnt_leaf; /* leaf fs we mounted on */ 116 specificdata_reference 117 mnt_specdataref; /* subsystem specific data */ 118 }; 119 120 /* 121 * Sysctl CTL_VFS definitions. 122 * 123 * Second level identifier specifies which filesystem. Second level 124 * identifier VFS_GENERIC returns information about all filesystems. 125 * 126 * Note the slightly non-flat nature of these sysctl numbers. Oh for 127 * a better sysctl interface. 128 */ 129 #define VFS_GENERIC 0 /* generic filesystem information */ 130 #define VFS_MAXTYPENUM 1 /* int: highest defined fs type */ 131 #define VFS_CONF 2 /* struct: vfsconf for filesystem given 132 as next argument */ 133 #define VFS_USERMOUNT 3 /* enable/disable fs mnt by non-root */ 134 #define VFS_MAGICLINKS 4 /* expand 'magic' symlinks */ 135 #define VFSGEN_MAXID 5 /* number of valid vfs.generic ids */ 136 137 #ifndef _STANDALONE 138 /* 139 * USE THE SAME NAMES AS MOUNT_*! 140 * 141 * Only need to add new entry here if the filesystem actually supports 142 * sysctl(2). 143 */ 144 #define CTL_VFS_NAMES { \ 145 { "generic", CTLTYPE_NODE }, \ 146 { MOUNT_FFS, CTLTYPE_NODE }, \ 147 { MOUNT_NFS, CTLTYPE_NODE }, \ 148 { MOUNT_MFS, CTLTYPE_NODE }, \ 149 { MOUNT_MSDOS, CTLTYPE_NODE }, \ 150 { MOUNT_LFS, CTLTYPE_NODE }, \ 151 { 0, 0 }, /* MOUNT_LOFS */ \ 152 { MOUNT_FDESC, CTLTYPE_NODE }, \ 153 { MOUNT_PORTAL, CTLTYPE_NODE }, \ 154 { MOUNT_NULL, CTLTYPE_NODE }, \ 155 { MOUNT_UMAP, CTLTYPE_NODE }, \ 156 { MOUNT_KERNFS, CTLTYPE_NODE }, \ 157 { MOUNT_PROCFS, CTLTYPE_NODE }, \ 158 { MOUNT_AFS, CTLTYPE_NODE }, \ 159 { MOUNT_CD9660, CTLTYPE_NODE }, \ 160 { MOUNT_UNION, CTLTYPE_NODE }, \ 161 { MOUNT_ADOSFS, CTLTYPE_NODE }, \ 162 { MOUNT_EXT2FS, CTLTYPE_NODE }, \ 163 { MOUNT_CODA, CTLTYPE_NODE }, \ 164 { MOUNT_FILECORE, CTLTYPE_NODE }, \ 165 { MOUNT_NTFS, CTLTYPE_NODE }, \ 166 } 167 168 #define VFS_MAXID 20 /* number of valid vfs ids */ 169 170 #define CTL_VFSGENCTL_NAMES { \ 171 { 0, 0 }, \ 172 { "maxtypenum", CTLTYPE_INT }, \ 173 { "conf", CTLTYPE_NODE }, /* Special */ \ 174 { "usermount", CTLTYPE_INT }, \ 175 { "magiclinks", CTLTYPE_INT }, \ 176 } 177 178 /* 179 * Operations supported on mounted file system. 180 */ 181 #ifdef _KERNEL 182 183 #if __STDC__ 184 struct nameidata; 185 struct mbuf; 186 struct vnodeopv_desc; 187 struct kauth_cred; 188 #endif 189 190 #define VFS_PROTOS(fsname) \ 191 int fsname##_mount(struct mount *, const char *, void *, \ 192 struct nameidata *, struct lwp *); \ 193 int fsname##_start(struct mount *, int, struct lwp *); \ 194 int fsname##_unmount(struct mount *, int, struct lwp *); \ 195 int fsname##_root(struct mount *, struct vnode **); \ 196 int fsname##_quotactl(struct mount *, int, uid_t, void *, \ 197 struct lwp *); \ 198 int fsname##_statvfs(struct mount *, struct statvfs *, \ 199 struct lwp *); \ 200 int fsname##_sync(struct mount *, int, struct kauth_cred *, \ 201 struct lwp *); \ 202 int fsname##_vget(struct mount *, ino_t, struct vnode **); \ 203 int fsname##_fhtovp(struct mount *, struct fid *, struct vnode **); \ 204 int fsname##_vptofh(struct vnode *, struct fid *); \ 205 void fsname##_init(void); \ 206 void fsname##_reinit(void); \ 207 void fsname##_done(void); \ 208 int fsname##_mountroot(void); \ 209 int fsname##_snapshot(struct mount *, struct vnode *, \ 210 struct timespec *); \ 211 int fsname##_extattrctl(struct mount *, int, struct vnode *, int, \ 212 const char *, struct lwp *); 213 214 struct vfsops { 215 const char *vfs_name; 216 int (*vfs_mount) (struct mount *, const char *, void *, 217 struct nameidata *, struct lwp *); 218 int (*vfs_start) (struct mount *, int, struct lwp *); 219 int (*vfs_unmount) (struct mount *, int, struct lwp *); 220 int (*vfs_root) (struct mount *, struct vnode **); 221 int (*vfs_quotactl) (struct mount *, int, uid_t, void *, 222 struct lwp *); 223 int (*vfs_statvfs) (struct mount *, struct statvfs *, 224 struct lwp *); 225 int (*vfs_sync) (struct mount *, int, struct kauth_cred *, 226 struct lwp *); 227 int (*vfs_vget) (struct mount *, ino_t, struct vnode **); 228 int (*vfs_fhtovp) (struct mount *, struct fid *, 229 struct vnode **); 230 int (*vfs_vptofh) (struct vnode *, struct fid *, size_t *); 231 void (*vfs_init) (void); 232 void (*vfs_reinit) (void); 233 void (*vfs_done) (void); 234 int (*vfs_mountroot)(void); 235 int (*vfs_snapshot) (struct mount *, struct vnode *, 236 struct timespec *); 237 int (*vfs_extattrctl) (struct mount *, int, 238 struct vnode *, int, const char *, 239 struct lwp *); 240 const struct vnodeopv_desc * const *vfs_opv_descs; 241 int vfs_refcount; 242 LIST_ENTRY(vfsops) vfs_list; 243 }; 244 245 #define VFS_ATTACH(vfs) __link_set_add_data(vfsops, vfs) 246 247 #define VFS_MOUNT(MP, PATH, DATA, NDP, L) \ 248 (*(MP)->mnt_op->vfs_mount)(MP, PATH, DATA, NDP, L) 249 #define VFS_START(MP, FLAGS, L) (*(MP)->mnt_op->vfs_start)(MP, FLAGS, L) 250 #define VFS_UNMOUNT(MP, FORCE, L) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, L) 251 #define VFS_ROOT(MP, VPP) (*(MP)->mnt_op->vfs_root)(MP, VPP) 252 #define VFS_QUOTACTL(MP,C,U,A,L) (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, L) 253 #define VFS_STATVFS(MP, SBP, L) (*(MP)->mnt_op->vfs_statvfs)(MP, SBP, L) 254 #define VFS_SYNC(MP, WAIT, C, L) (*(MP)->mnt_op->vfs_sync)(MP, WAIT, C, L) 255 #define VFS_VGET(MP, INO, VPP) (*(MP)->mnt_op->vfs_vget)(MP, INO, VPP) 256 #define VFS_FHTOVP(MP, FIDP, VPP) (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP) 257 #define VFS_VPTOFH(VP, FIDP, FIDSZP) (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP, FIDSZP) 258 #define VFS_SNAPSHOT(MP, VP, TS) (*(MP)->mnt_op->vfs_snapshot)(MP, VP, TS) 259 #define VFS_EXTATTRCTL(MP, C, VP, AS, AN, L) \ 260 (*(MP)->mnt_op->vfs_extattrctl)(MP, C, VP, AS, AN, L) 261 262 struct vfs_hooks { 263 void (*vh_unmount)(struct mount *); 264 }; 265 #define VFS_HOOKS_ATTACH(hooks) __link_set_add_data(vfs_hooks, hooks) 266 267 void vfs_hooks_unmount(struct mount *); 268 269 #endif /* _KERNEL */ 270 271 /* 272 * Export arguments for local filesystem mount calls. 273 * 274 * This structure is deprecated and is only provided for compatibility 275 * reasons with old binary utilities; several file systems expose an 276 * instance of this structure in their mount arguments structure, thus 277 * needing a padding in place of the old values. This definition cannot 278 * change in the future due to this reason. 279 * XXX: This should be moved to the compat subtree but cannot be done 280 * until we can move the mount args structures themselves. 281 * 282 * The current export_args structure can be found in nfs/nfs.h. 283 */ 284 struct export_args30 { 285 int ex_flags; /* export related flags */ 286 uid_t ex_root; /* mapping for root uid */ 287 struct uucred ex_anon; /* mapping for anonymous user */ 288 struct sockaddr *ex_addr; /* net address to which exported */ 289 int ex_addrlen; /* and the net address length */ 290 struct sockaddr *ex_mask; /* mask of valid bits in saddr */ 291 int ex_masklen; /* and the smask length */ 292 char *ex_indexfile; /* index file for WebNFS URLs */ 293 }; 294 295 #ifdef _KERNEL 296 #include <sys/mallocvar.h> 297 MALLOC_DECLARE(M_MOUNT); 298 299 /* 300 * exported VFS interface (see vfssubr(9)) 301 */ 302 struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */ 303 int vfs_composefh(struct vnode *, fhandle_t *, size_t *); 304 int vfs_composefh_alloc(struct vnode *, fhandle_t **); 305 void vfs_composefh_free(fhandle_t *); 306 int vfs_fhtovp(fhandle_t *, struct vnode **); 307 int vfs_mountedon(struct vnode *);/* is a vfs mounted on vp */ 308 int vfs_mountroot(void); 309 void vfs_shutdown(void); /* unmount and sync file systems */ 310 void vfs_unmountall(struct lwp *); /* unmount file systems */ 311 int vfs_busy(struct mount *, int, struct simplelock *); 312 int vfs_rootmountalloc(const char *, const char *, struct mount **); 313 void vfs_unbusy(struct mount *); 314 int vfs_attach(struct vfsops *); 315 int vfs_detach(struct vfsops *); 316 void vfs_reinit(void); 317 struct vfsops *vfs_getopsbyname(const char *); 318 319 int vfs_stdextattrctl(struct mount *, int, struct vnode *, 320 int, const char *, struct lwp *); 321 322 extern CIRCLEQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */ 323 extern struct vfsops *vfssw[]; /* filesystem type table */ 324 extern int nvfssw; 325 extern struct simplelock mountlist_slock; 326 extern struct simplelock spechash_slock; 327 long makefstype(const char *); 328 int dounmount(struct mount *, int, struct lwp *); 329 void vfsinit(void); 330 void vfs_opv_init(const struct vnodeopv_desc * const *); 331 void vfs_opv_free(const struct vnodeopv_desc * const *); 332 #ifdef DEBUG 333 void vfs_bufstats(void); 334 #endif 335 336 int mount_specific_key_create(specificdata_key_t *, specificdata_dtor_t); 337 void mount_specific_key_delete(specificdata_key_t); 338 void mount_initspecific(struct mount *); 339 void mount_finispecific(struct mount *); 340 void * mount_getspecific(struct mount *, specificdata_key_t); 341 void mount_setspecific(struct mount *, specificdata_key_t, void *); 342 343 /* 344 * syscall helpers 345 */ 346 347 int vfs_copyinfh_alloc(const void *, size_t, fhandle_t **); 348 void vfs_copyinfh_free(fhandle_t *); 349 350 struct stat; 351 int dofhopen(struct lwp *, const void *, size_t, int, register_t *); 352 int dofhstat(struct lwp *, const void *, size_t, struct stat *, register_t *); 353 int dofhstatvfs(struct lwp *, const void *, size_t, struct statvfs *, int, 354 register_t *); 355 356 LIST_HEAD(vfs_list_head, vfsops); 357 extern struct vfs_list_head vfs_list; 358 359 #else /* _KERNEL */ 360 361 #include <sys/cdefs.h> 362 363 __BEGIN_DECLS 364 #if !defined(__LIBC12_SOURCE__) && !defined(_STANDALONE) 365 int getfh(const char *, void *, size_t *) 366 __RENAME(__getfh30); 367 #endif 368 369 int mount(const char *, const char *, int, void *); 370 int unmount(const char *, int); 371 #if defined(_NETBSD_SOURCE) 372 #ifndef __LIBC12_SOURCE__ 373 int fhopen(const void *, size_t, int) __RENAME(__fhopen40); 374 int fhstat(const void *, size_t, struct stat *) __RENAME(__fhstat40); 375 #endif 376 #endif /* _NETBSD_SOURCE */ 377 __END_DECLS 378 379 #endif /* _KERNEL */ 380 #endif /* !_STANDALONE */ 381 382 #endif /* !_SYS_MOUNT_H_ */
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