/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1989, 1991, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)mount.h 8.21 (Berkeley) 5/20/95 * $FreeBSD$ */ #ifndef _SYS_MOUNT_H_ #define _SYS_MOUNT_H_ #include #include #ifdef _KERNEL #include #include #include #include #include #endif /* * NOTE: When changing statfs structure, mount structure, MNT_* flags or * MNTK_* flags also update DDB show mount command in vfs_subr.c. */ typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */ /* * File identifier. * These are unique per filesystem on a single machine. */ #define MAXFIDSZ 16 struct fid { u_short fid_len; /* length of data in bytes */ u_short fid_data0; /* force longword alignment */ char fid_data[MAXFIDSZ]; /* data (variable length) */ }; /* * filesystem statistics */ #define MFSNAMELEN 16 /* length of type name including null */ #define MNAMELEN 1024 /* size of on/from name bufs */ #define STATFS_VERSION 0x20140518 /* current version number */ struct statfs { uint32_t f_version; /* structure version number */ uint32_t f_type; /* type of filesystem */ uint64_t f_flags; /* copy of mount exported flags */ uint64_t f_bsize; /* filesystem fragment size */ uint64_t f_iosize; /* optimal transfer block size */ uint64_t f_blocks; /* total data blocks in filesystem */ uint64_t f_bfree; /* free blocks in filesystem */ int64_t f_bavail; /* free blocks avail to non-superuser */ uint64_t f_files; /* total file nodes in filesystem */ int64_t f_ffree; /* free nodes avail to non-superuser */ uint64_t f_syncwrites; /* count of sync writes since mount */ uint64_t f_asyncwrites; /* count of async writes since mount */ uint64_t f_syncreads; /* count of sync reads since mount */ uint64_t f_asyncreads; /* count of async reads since mount */ uint64_t f_spare[10]; /* unused spare */ uint32_t f_namemax; /* maximum filename length */ uid_t f_owner; /* user that mounted the filesystem */ fsid_t f_fsid; /* filesystem id */ char f_charspare[80]; /* spare string space */ char f_fstypename[MFSNAMELEN]; /* filesystem type name */ char f_mntfromname[MNAMELEN]; /* mounted filesystem */ char f_mntonname[MNAMELEN]; /* directory on which mounted */ }; #if defined(_WANT_FREEBSD11_STATFS) || defined(_KERNEL) #define FREEBSD11_STATFS_VERSION 0x20030518 /* current version number */ struct freebsd11_statfs { uint32_t f_version; /* structure version number */ uint32_t f_type; /* type of filesystem */ uint64_t f_flags; /* copy of mount exported flags */ uint64_t f_bsize; /* filesystem fragment size */ uint64_t f_iosize; /* optimal transfer block size */ uint64_t f_blocks; /* total data blocks in filesystem */ uint64_t f_bfree; /* free blocks in filesystem */ int64_t f_bavail; /* free blocks avail to non-superuser */ uint64_t f_files; /* total file nodes in filesystem */ int64_t f_ffree; /* free nodes avail to non-superuser */ uint64_t f_syncwrites; /* count of sync writes since mount */ uint64_t f_asyncwrites; /* count of async writes since mount */ uint64_t f_syncreads; /* count of sync reads since mount */ uint64_t f_asyncreads; /* count of async reads since mount */ uint64_t f_spare[10]; /* unused spare */ uint32_t f_namemax; /* maximum filename length */ uid_t f_owner; /* user that mounted the filesystem */ fsid_t f_fsid; /* filesystem id */ char f_charspare[80]; /* spare string space */ char f_fstypename[16]; /* filesystem type name */ char f_mntfromname[88]; /* mounted filesystem */ char f_mntonname[88]; /* directory on which mounted */ }; #endif /* _WANT_FREEBSD11_STATFS || _KERNEL */ #ifdef _KERNEL #define OMFSNAMELEN 16 /* length of fs type name, including null */ #define OMNAMELEN (88 - 2 * sizeof(long)) /* size of on/from name bufs */ /* XXX getfsstat.2 is out of date with write and read counter changes here. */ /* XXX statfs.2 is out of date with read counter changes here. */ struct ostatfs { long f_spare2; /* placeholder */ long f_bsize; /* fundamental filesystem block size */ long f_iosize; /* optimal transfer block size */ long f_blocks; /* total data blocks in filesystem */ long f_bfree; /* free blocks in fs */ long f_bavail; /* free blocks avail to non-superuser */ long f_files; /* total file nodes in filesystem */ long f_ffree; /* free file nodes in fs */ fsid_t f_fsid; /* filesystem id */ uid_t f_owner; /* user that mounted the filesystem */ int f_type; /* type of filesystem */ int f_flags; /* copy of mount exported flags */ long f_syncwrites; /* count of sync writes since mount */ long f_asyncwrites; /* count of async writes since mount */ char f_fstypename[OMFSNAMELEN]; /* fs type name */ char f_mntonname[OMNAMELEN]; /* directory on which mounted */ long f_syncreads; /* count of sync reads since mount */ long f_asyncreads; /* count of async reads since mount */ short f_spares1; /* unused spare */ char f_mntfromname[OMNAMELEN];/* mounted filesystem */ short f_spares2; /* unused spare */ /* * XXX on machines where longs are aligned to 8-byte boundaries, there * is an unnamed int32_t here. This spare was after the apparent end * of the struct until we bit off the read counters from f_mntonname. */ long f_spare[2]; /* unused spare */ }; TAILQ_HEAD(vnodelst, vnode); /* Mount options list */ TAILQ_HEAD(vfsoptlist, vfsopt); struct vfsopt { TAILQ_ENTRY(vfsopt) link; char *name; void *value; int len; int pos; int seen; }; /* * Structure per mounted filesystem. Each mounted filesystem has an * array of operations and an instance record. The filesystems are * put on a doubly linked list. * * Lock reference: * l - mnt_listmtx * m - mountlist_mtx * i - interlock * v - vnode freelist mutex * * Unmarked fields are considered stable as long as a ref is held. * */ struct mount { struct mtx mnt_mtx; /* mount structure interlock */ int mnt_gen; /* struct mount generation */ #define mnt_startzero mnt_list TAILQ_ENTRY(mount) mnt_list; /* (m) mount list */ struct vfsops *mnt_op; /* operations on fs */ struct vfsconf *mnt_vfc; /* configuration info */ struct vnode *mnt_vnodecovered; /* vnode we mounted on */ struct vnode *mnt_syncer; /* syncer vnode */ int mnt_ref; /* (i) Reference count */ struct vnodelst mnt_nvnodelist; /* (i) list of vnodes */ int mnt_nvnodelistsize; /* (i) # of vnodes */ int mnt_writeopcount; /* (i) write syscalls pending */ int mnt_kern_flag; /* (i) kernel only flags */ uint64_t mnt_flag; /* (i) flags shared with user */ struct vfsoptlist *mnt_opt; /* current mount options */ struct vfsoptlist *mnt_optnew; /* new options passed to fs */ int mnt_maxsymlinklen; /* max size of short symlink */ struct statfs mnt_stat; /* cache of filesystem stats */ struct ucred *mnt_cred; /* credentials of mounter */ void * mnt_data; /* private data */ time_t mnt_time; /* last time written*/ int mnt_iosize_max; /* max size for clusters, etc */ struct netexport *mnt_export; /* export list */ struct label *mnt_label; /* MAC label for the fs */ u_int mnt_hashseed; /* Random seed for vfs_hash */ int mnt_lockref; /* (i) Lock reference count */ int mnt_secondary_writes; /* (i) # of secondary writes */ int mnt_secondary_accwrites;/* (i) secondary wr. starts */ struct thread *mnt_susp_owner; /* (i) thread owning suspension */ #define mnt_endzero mnt_gjprovider char *mnt_gjprovider; /* gjournal provider name */ struct mtx mnt_listmtx; struct vnodelst mnt_activevnodelist; /* (l) list of active vnodes */ int mnt_activevnodelistsize;/* (l) # of active vnodes */ struct vnodelst mnt_tmpfreevnodelist; /* (l) list of free vnodes */ int mnt_tmpfreevnodelistsize;/* (l) # of free vnodes */ struct lock mnt_explock; /* vfs_export walkers lock */ TAILQ_ENTRY(mount) mnt_upper_link; /* (m) we in the all uppers */ TAILQ_HEAD(, mount) mnt_uppers; /* (m) upper mounts over us*/ }; /* * Definitions for MNT_VNODE_FOREACH_ALL. */ struct vnode *__mnt_vnode_next_all(struct vnode **mvp, struct mount *mp); struct vnode *__mnt_vnode_first_all(struct vnode **mvp, struct mount *mp); void __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp); #define MNT_VNODE_FOREACH_ALL(vp, mp, mvp) \ for (vp = __mnt_vnode_first_all(&(mvp), (mp)); \ (vp) != NULL; vp = __mnt_vnode_next_all(&(mvp), (mp))) #define MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp) \ do { \ MNT_ILOCK(mp); \ __mnt_vnode_markerfree_all(&(mvp), (mp)); \ /* MNT_IUNLOCK(mp); -- done in above function */ \ mtx_assert(MNT_MTX(mp), MA_NOTOWNED); \ } while (0) /* * Definitions for MNT_VNODE_FOREACH_ACTIVE. */ struct vnode *__mnt_vnode_next_active(struct vnode **mvp, struct mount *mp); struct vnode *__mnt_vnode_first_active(struct vnode **mvp, struct mount *mp); void __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *); #define MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) \ for (vp = __mnt_vnode_first_active(&(mvp), (mp)); \ (vp) != NULL; vp = __mnt_vnode_next_active(&(mvp), (mp))) #define MNT_VNODE_FOREACH_ACTIVE_ABORT(mp, mvp) \ __mnt_vnode_markerfree_active(&(mvp), (mp)) #define MNT_ILOCK(mp) mtx_lock(&(mp)->mnt_mtx) #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx) #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx) #define MNT_MTX(mp) (&(mp)->mnt_mtx) #define MNT_REF(mp) (mp)->mnt_ref++ #define MNT_REL(mp) do { \ KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref")); \ (mp)->mnt_ref--; \ if ((mp)->mnt_ref == 0) \ wakeup((mp)); \ } while (0) #endif /* _KERNEL */ /* * User specifiable flags, stored in mnt_flag. */ #define MNT_RDONLY 0x0000000000000001ULL /* read only filesystem */ #define MNT_SYNCHRONOUS 0x0000000000000002ULL /* fs written synchronously */ #define MNT_NOEXEC 0x0000000000000004ULL /* can't exec from filesystem */ #define MNT_NOSUID 0x0000000000000008ULL /* don't honor setuid fs bits */ #define MNT_NFS4ACLS 0x0000000000000010ULL /* enable NFS version 4 ACLs */ #define MNT_UNION 0x0000000000000020ULL /* union with underlying fs */ #define MNT_ASYNC 0x0000000000000040ULL /* fs written asynchronously */ #define MNT_SUIDDIR 0x0000000000100000ULL /* special SUID dir handling */ #define MNT_SOFTDEP 0x0000000000200000ULL /* using soft updates */ #define MNT_NOSYMFOLLOW 0x0000000000400000ULL /* do not follow symlinks */ #define MNT_GJOURNAL 0x0000000002000000ULL /* GEOM journal support enabled */ #define MNT_MULTILABEL 0x0000000004000000ULL /* MAC support for objects */ #define MNT_ACLS 0x0000000008000000ULL /* ACL support enabled */ #define MNT_NOATIME 0x0000000010000000ULL /* dont update file access time */ #define MNT_NOCLUSTERR 0x0000000040000000ULL /* disable cluster read */ #define MNT_NOCLUSTERW 0x0000000080000000ULL /* disable cluster write */ #define MNT_SUJ 0x0000000100000000ULL /* using journaled soft updates */ #define MNT_AUTOMOUNTED 0x0000000200000000ULL /* mounted by automountd(8) */ /* * NFS export related mount flags. */ #define MNT_EXRDONLY 0x0000000000000080ULL /* exported read only */ #define MNT_EXPORTED 0x0000000000000100ULL /* filesystem is exported */ #define MNT_DEFEXPORTED 0x0000000000000200ULL /* exported to the world */ #define MNT_EXPORTANON 0x0000000000000400ULL /* anon uid mapping for all */ #define MNT_EXKERB 0x0000000000000800ULL /* exported with Kerberos */ #define MNT_EXPUBLIC 0x0000000020000000ULL /* public export (WebNFS) */ /* * Flags set by internal operations, * but visible to the user. * XXX some of these are not quite right.. (I've never seen the root flag set) */ #define MNT_LOCAL 0x0000000000001000ULL /* filesystem is stored locally */ #define MNT_QUOTA 0x0000000000002000ULL /* quotas are enabled on fs */ #define MNT_ROOTFS 0x0000000000004000ULL /* identifies the root fs */ #define MNT_USER 0x0000000000008000ULL /* mounted by a user */ #define MNT_IGNORE 0x0000000000800000ULL /* do not show entry in df */ #define MNT_VERIFIED 0x0000000400000000ULL /* filesystem is verified */ /* * Mask of flags that are visible to statfs(). * XXX I think that this could now become (~(MNT_CMDFLAGS)) * but the 'mount' program may need changing to handle this. */ #define MNT_VISFLAGMASK (MNT_RDONLY | MNT_SYNCHRONOUS | MNT_NOEXEC | \ MNT_NOSUID | MNT_UNION | MNT_SUJ | \ MNT_ASYNC | MNT_EXRDONLY | MNT_EXPORTED | \ MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB | \ MNT_LOCAL | MNT_USER | MNT_QUOTA | \ MNT_ROOTFS | MNT_NOATIME | MNT_NOCLUSTERR| \ MNT_NOCLUSTERW | MNT_SUIDDIR | MNT_SOFTDEP | \ MNT_IGNORE | MNT_EXPUBLIC | MNT_NOSYMFOLLOW | \ MNT_GJOURNAL | MNT_MULTILABEL | MNT_ACLS | \ MNT_NFS4ACLS | MNT_AUTOMOUNTED | MNT_VERIFIED) /* Mask of flags that can be updated. */ #define MNT_UPDATEMASK (MNT_NOSUID | MNT_NOEXEC | \ MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | \ MNT_NOATIME | \ MNT_NOSYMFOLLOW | MNT_IGNORE | \ MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR | \ MNT_ACLS | MNT_USER | MNT_NFS4ACLS | \ MNT_AUTOMOUNTED) /* * External filesystem command modifier flags. * Unmount can use the MNT_FORCE flag. * XXX: These are not STATES and really should be somewhere else. * XXX: MNT_BYFSID and MNT_NONBUSY collide with MNT_ACLS and MNT_MULTILABEL, * but because MNT_ACLS and MNT_MULTILABEL are only used for mount(2), * and MNT_BYFSID and MNT_NONBUSY are only used for unmount(2), * it's harmless. */ #define MNT_UPDATE 0x0000000000010000ULL /* not real mount, just update */ #define MNT_DELEXPORT 0x0000000000020000ULL /* delete export host lists */ #define MNT_RELOAD 0x0000000000040000ULL /* reload filesystem data */ #define MNT_FORCE 0x0000000000080000ULL /* force unmount or readonly */ #define MNT_SNAPSHOT 0x0000000001000000ULL /* snapshot the filesystem */ #define MNT_NONBUSY 0x0000000004000000ULL /* check vnode use counts. */ #define MNT_BYFSID 0x0000000008000000ULL /* specify filesystem by ID. */ #define MNT_CMDFLAGS (MNT_UPDATE | MNT_DELEXPORT | MNT_RELOAD | \ MNT_FORCE | MNT_SNAPSHOT | MNT_NONBUSY | \ MNT_BYFSID) /* * Internal filesystem control flags stored in mnt_kern_flag. * * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed * past the mount point. This keeps the subtree stable during mounts * and unmounts. * * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while * dounmount() is still waiting to lock the mountpoint. This allows * the filesystem to cancel operations that might otherwise deadlock * with the unmount attempt (used by NFS). * * MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated * to allow for failed unmount attempt to restore the syncer vnode for * the mount. */ #define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */ #define MNTK_ASYNC 0x00000002 /* filtered async flag */ #define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */ #define MNTK_NOINSMNTQ 0x00000008 /* insmntque is not allowed */ #define MNTK_DRAINING 0x00000010 /* lock draining is happening */ #define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */ #define MNTK_EXTENDED_SHARED 0x00000040 /* Allow shared locking for more ops */ #define MNTK_SHARED_WRITES 0x00000080 /* Allow shared locking for writes */ #define MNTK_NO_IOPF 0x00000100 /* Disallow page faults during reads and writes. Filesystem shall properly handle i/o state on EFAULT. */ #define MNTK_VGONE_UPPER 0x00000200 #define MNTK_VGONE_WAITER 0x00000400 #define MNTK_LOOKUP_EXCL_DOTDOT 0x00000800 #define MNTK_MARKER 0x00001000 #define MNTK_UNMAPPED_BUFS 0x00002000 #define MNTK_USES_BCACHE 0x00004000 /* FS uses the buffer cache. */ #define MNTK_NOASYNC 0x00800000 /* disable async */ #define MNTK_UNMOUNT 0x01000000 /* unmount in progress */ #define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */ #define MNTK_SUSPEND 0x08000000 /* request write suspension */ #define MNTK_SUSPEND2 0x04000000 /* block secondary writes */ #define MNTK_SUSPENDED 0x10000000 /* write operations are suspended */ #define MNTK_NULL_NOCACHE 0x20000000 /* auto disable cache for nullfs mounts over this fs */ #define MNTK_LOOKUP_SHARED 0x40000000 /* FS supports shared lock lookups */ #define MNTK_NOKNOTE 0x80000000 /* Don't send KNOTEs from VOP hooks */ #ifdef _KERNEL static inline int MNT_SHARED_WRITES(struct mount *mp) { return (mp != NULL && (mp->mnt_kern_flag & MNTK_SHARED_WRITES) != 0); } static inline int MNT_EXTENDED_SHARED(struct mount *mp) { return (mp != NULL && (mp->mnt_kern_flag & MNTK_EXTENDED_SHARED) != 0); } #endif /* * Sysctl CTL_VFS definitions. * * Second level identifier specifies which filesystem. Second level * identifier VFS_VFSCONF returns information about all filesystems. * Second level identifier VFS_GENERIC is non-terminal. */ #define VFS_VFSCONF 0 /* get configured filesystems */ #define VFS_GENERIC 0 /* generic filesystem information */ /* * Third level identifiers for VFS_GENERIC are given below; third * level identifiers for specific filesystems are given in their * mount specific header files. */ #define VFS_MAXTYPENUM 1 /* int: highest defined filesystem type */ #define VFS_CONF 2 /* struct: vfsconf for filesystem given as next argument */ /* * Flags for various system call interfaces. * * waitfor flags to vfs_sync() and getfsstat() */ #define MNT_WAIT 1 /* synchronously wait for I/O to complete */ #define MNT_NOWAIT 2 /* start all I/O, but do not wait for it */ #define MNT_LAZY 3 /* push data not written by filesystem syncer */ #define MNT_SUSPEND 4 /* Suspend file system after sync */ /* * Generic file handle */ struct fhandle { fsid_t fh_fsid; /* Filesystem id of mount point */ struct fid fh_fid; /* Filesys specific id */ }; typedef struct fhandle fhandle_t; /* * Old export arguments without security flavor list */ struct oexport_args { int ex_flags; /* export related flags */ uid_t ex_root; /* mapping for root uid */ struct xucred ex_anon; /* mapping for anonymous user */ struct sockaddr *ex_addr; /* net address to which exported */ u_char ex_addrlen; /* and the net address length */ struct sockaddr *ex_mask; /* mask of valid bits in saddr */ u_char ex_masklen; /* and the smask length */ char *ex_indexfile; /* index file for WebNFS URLs */ }; /* * Export arguments for local filesystem mount calls. */ #define MAXSECFLAVORS 5 struct export_args { int ex_flags; /* export related flags */ uid_t ex_root; /* mapping for root uid */ struct xucred ex_anon; /* mapping for anonymous user */ struct sockaddr *ex_addr; /* net address to which exported */ u_char ex_addrlen; /* and the net address length */ struct sockaddr *ex_mask; /* mask of valid bits in saddr */ u_char ex_masklen; /* and the smask length */ char *ex_indexfile; /* index file for WebNFS URLs */ int ex_numsecflavors; /* security flavor count */ int ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */ }; /* * Structure holding information for a publicly exported filesystem * (WebNFS). Currently the specs allow just for one such filesystem. */ struct nfs_public { int np_valid; /* Do we hold valid information */ fhandle_t np_handle; /* Filehandle for pub fs (internal) */ struct mount *np_mount; /* Mountpoint of exported fs */ char *np_index; /* Index file */ }; /* * Filesystem configuration information. One of these exists for each * type of filesystem supported by the kernel. These are searched at * mount time to identify the requested filesystem. * * XXX: Never change the first two arguments! */ struct vfsconf { u_int vfc_version; /* ABI version number */ char vfc_name[MFSNAMELEN]; /* filesystem type name */ struct vfsops *vfc_vfsops; /* filesystem operations vector */ struct vfsops *vfc_vfsops_sd; /* ... signal-deferred */ int vfc_typenum; /* historic filesystem type number */ int vfc_refcount; /* number mounted of this type */ int vfc_flags; /* permanent flags */ int vfc_prison_flag; /* prison allow.mount.* flag */ struct vfsoptdecl *vfc_opts; /* mount options */ TAILQ_ENTRY(vfsconf) vfc_list; /* list of vfscons */ }; /* Userland version of the struct vfsconf. */ struct xvfsconf { struct vfsops *vfc_vfsops; /* filesystem operations vector */ char vfc_name[MFSNAMELEN]; /* filesystem type name */ int vfc_typenum; /* historic filesystem type number */ int vfc_refcount; /* number mounted of this type */ int vfc_flags; /* permanent flags */ struct vfsconf *vfc_next; /* next in list */ }; #ifndef BURN_BRIDGES struct ovfsconf { void *vfc_vfsops; char vfc_name[32]; int vfc_index; int vfc_refcount; int vfc_flags; }; #endif /* * NB: these flags refer to IMPLEMENTATION properties, not properties of * any actual mounts; i.e., it does not make sense to change the flags. */ #define VFCF_STATIC 0x00010000 /* statically compiled into kernel */ #define VFCF_NETWORK 0x00020000 /* may get data over the network */ #define VFCF_READONLY 0x00040000 /* writes are not implemented */ #define VFCF_SYNTHETIC 0x00080000 /* data does not represent real files */ #define VFCF_LOOPBACK 0x00100000 /* aliases some other mounted FS */ #define VFCF_UNICODE 0x00200000 /* stores file names as Unicode */ #define VFCF_JAIL 0x00400000 /* can be mounted from within a jail */ #define VFCF_DELEGADMIN 0x00800000 /* supports delegated administration */ #define VFCF_SBDRY 0x01000000 /* Stop at Boundary: defer stop requests to kernel->user (AST) transition */ typedef uint32_t fsctlop_t; struct vfsidctl { int vc_vers; /* should be VFSIDCTL_VERS1 (below) */ fsid_t vc_fsid; /* fsid to operate on */ char vc_fstypename[MFSNAMELEN]; /* type of fs 'nfs' or '*' */ fsctlop_t vc_op; /* operation VFS_CTL_* (below) */ void *vc_ptr; /* pointer to data structure */ size_t vc_len; /* sizeof said structure */ u_int32_t vc_spare[12]; /* spare (must be zero) */ }; /* vfsidctl API version. */ #define VFS_CTL_VERS1 0x01 /* * New style VFS sysctls, do not reuse/conflict with the namespace for * private sysctls. * All "global" sysctl ops have the 33rd bit set: * 0x...1.... * Private sysctl ops should have the 33rd bit unset. */ #define VFS_CTL_QUERY 0x00010001 /* anything wrong? (vfsquery) */ #define VFS_CTL_TIMEO 0x00010002 /* set timeout for vfs notification */ #define VFS_CTL_NOLOCKS 0x00010003 /* disable file locking */ struct vfsquery { u_int32_t vq_flags; u_int32_t vq_spare[31]; }; /* vfsquery flags */ #define VQ_NOTRESP 0x0001 /* server down */ #define VQ_NEEDAUTH 0x0002 /* server bad auth */ #define VQ_LOWDISK 0x0004 /* we're low on space */ #define VQ_MOUNT 0x0008 /* new filesystem arrived */ #define VQ_UNMOUNT 0x0010 /* filesystem has left */ #define VQ_DEAD 0x0020 /* filesystem is dead, needs force unmount */ #define VQ_ASSIST 0x0040 /* filesystem needs assistance from external program */ #define VQ_NOTRESPLOCK 0x0080 /* server lockd down */ #define VQ_FLAG0100 0x0100 /* placeholder */ #define VQ_FLAG0200 0x0200 /* placeholder */ #define VQ_FLAG0400 0x0400 /* placeholder */ #define VQ_FLAG0800 0x0800 /* placeholder */ #define VQ_FLAG1000 0x1000 /* placeholder */ #define VQ_FLAG2000 0x2000 /* placeholder */ #define VQ_FLAG4000 0x4000 /* placeholder */ #define VQ_FLAG8000 0x8000 /* placeholder */ #ifdef _KERNEL /* Point a sysctl request at a vfsidctl's data. */ #define VCTLTOREQ(vc, req) \ do { \ (req)->newptr = (vc)->vc_ptr; \ (req)->newlen = (vc)->vc_len; \ (req)->newidx = 0; \ } while (0) #endif struct iovec; struct uio; #ifdef _KERNEL /* * vfs_busy specific flags and mask. */ #define MBF_NOWAIT 0x01 #define MBF_MNTLSTLOCK 0x02 #define MBF_MASK (MBF_NOWAIT | MBF_MNTLSTLOCK) #ifdef MALLOC_DECLARE MALLOC_DECLARE(M_MOUNT); MALLOC_DECLARE(M_STATFS); #endif extern int maxvfsconf; /* highest defined filesystem type */ TAILQ_HEAD(vfsconfhead, vfsconf); extern struct vfsconfhead vfsconf; /* * Operations supported on mounted filesystem. */ struct mount_args; struct nameidata; struct sysctl_req; struct mntarg; typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags); typedef int vfs_unmount_t(struct mount *mp, int mntflags); typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp); typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg); typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp); typedef int vfs_sync_t(struct mount *mp, int waitfor); typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags, struct vnode **vpp); typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp); typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam, int *extflagsp, struct ucred **credanonp, int *numsecflavors, int **secflavors); typedef int vfs_init_t(struct vfsconf *); typedef int vfs_uninit_t(struct vfsconf *); typedef int vfs_extattrctl_t(struct mount *mp, int cmd, struct vnode *filename_vp, int attrnamespace, const char *attrname); typedef int vfs_mount_t(struct mount *mp); typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op, struct sysctl_req *req); typedef void vfs_susp_clean_t(struct mount *mp); typedef void vfs_notify_lowervp_t(struct mount *mp, struct vnode *lowervp); typedef void vfs_purge_t(struct mount *mp); struct vfsops { vfs_mount_t *vfs_mount; vfs_cmount_t *vfs_cmount; vfs_unmount_t *vfs_unmount; vfs_root_t *vfs_root; vfs_quotactl_t *vfs_quotactl; vfs_statfs_t *vfs_statfs; vfs_sync_t *vfs_sync; vfs_vget_t *vfs_vget; vfs_fhtovp_t *vfs_fhtovp; vfs_checkexp_t *vfs_checkexp; vfs_init_t *vfs_init; vfs_uninit_t *vfs_uninit; vfs_extattrctl_t *vfs_extattrctl; vfs_sysctl_t *vfs_sysctl; vfs_susp_clean_t *vfs_susp_clean; vfs_notify_lowervp_t *vfs_reclaim_lowervp; vfs_notify_lowervp_t *vfs_unlink_lowervp; vfs_purge_t *vfs_purge; vfs_mount_t *vfs_spare[6]; /* spares for ABI compat */ }; vfs_statfs_t __vfs_statfs; #define VFS_MOUNT(MP) ({ \ int _rc; \ \ TSRAW(curthread, TS_ENTER, "VFS_MOUNT", (MP)->mnt_vfc->vfc_name);\ _rc = (*(MP)->mnt_op->vfs_mount)(MP); \ TSRAW(curthread, TS_EXIT, "VFS_MOUNT", (MP)->mnt_vfc->vfc_name);\ _rc; }) #define VFS_UNMOUNT(MP, FORCE) ({ \ int _rc; \ \ _rc = (*(MP)->mnt_op->vfs_unmount)(MP, FORCE); \ _rc; }) #define VFS_ROOT(MP, FLAGS, VPP) ({ \ int _rc; \ \ _rc = (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP); \ _rc; }) #define VFS_QUOTACTL(MP, C, U, A) ({ \ int _rc; \ \ _rc = (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A); \ _rc; }) #define VFS_STATFS(MP, SBP) ({ \ int _rc; \ \ _rc = __vfs_statfs((MP), (SBP)); \ _rc; }) #define VFS_SYNC(MP, WAIT) ({ \ int _rc; \ \ _rc = (*(MP)->mnt_op->vfs_sync)(MP, WAIT); \ _rc; }) #define VFS_VGET(MP, INO, FLAGS, VPP) ({ \ int _rc; \ \ _rc = (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP); \ _rc; }) #define VFS_FHTOVP(MP, FIDP, FLAGS, VPP) ({ \ int _rc; \ \ _rc = (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, FLAGS, VPP); \ _rc; }) #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) ({ \ int _rc; \ \ _rc = (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC,\ SEC); \ _rc; }) #define VFS_EXTATTRCTL(MP, C, FN, NS, N) ({ \ int _rc; \ \ _rc = (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N); \ _rc; }) #define VFS_SYSCTL(MP, OP, REQ) ({ \ int _rc; \ \ _rc = (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ); \ _rc; }) #define VFS_SUSP_CLEAN(MP) do { \ if (*(MP)->mnt_op->vfs_susp_clean != NULL) { \ (*(MP)->mnt_op->vfs_susp_clean)(MP); \ } \ } while (0) #define VFS_RECLAIM_LOWERVP(MP, VP) do { \ if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) { \ (*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP)); \ } \ } while (0) #define VFS_UNLINK_LOWERVP(MP, VP) do { \ if (*(MP)->mnt_op->vfs_unlink_lowervp != NULL) { \ (*(MP)->mnt_op->vfs_unlink_lowervp)((MP), (VP)); \ } \ } while (0) #define VFS_PURGE(MP) do { \ if (*(MP)->mnt_op->vfs_purge != NULL) { \ (*(MP)->mnt_op->vfs_purge)(MP); \ } \ } while (0) #define VFS_KNOTE_LOCKED(vp, hint) do \ { \ if (((vp)->v_vflag & VV_NOKNOTE) == 0) \ VN_KNOTE((vp), (hint), KNF_LISTLOCKED); \ } while (0) #define VFS_KNOTE_UNLOCKED(vp, hint) do \ { \ if (((vp)->v_vflag & VV_NOKNOTE) == 0) \ VN_KNOTE((vp), (hint), 0); \ } while (0) #define VFS_NOTIFY_UPPER_RECLAIM 1 #define VFS_NOTIFY_UPPER_UNLINK 2 #include /* * Version numbers. */ #define VFS_VERSION_00 0x19660120 #define VFS_VERSION_01 0x20121030 #define VFS_VERSION_02 0x20180504 #define VFS_VERSION VFS_VERSION_02 #define VFS_SET(vfsops, fsname, flags) \ static struct vfsconf fsname ## _vfsconf = { \ .vfc_version = VFS_VERSION, \ .vfc_name = #fsname, \ .vfc_vfsops = &vfsops, \ .vfc_typenum = -1, \ .vfc_flags = flags, \ }; \ static moduledata_t fsname ## _mod = { \ #fsname, \ vfs_modevent, \ & fsname ## _vfsconf \ }; \ DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE) /* * exported vnode operations */ int dounmount(struct mount *, int, struct thread *); int kernel_mount(struct mntarg *ma, uint64_t flags); int kernel_vmount(int flags, ...); struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len); struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name); struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...); struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len); void statfs_scale_blocks(struct statfs *sf, long max_size); struct vfsconf *vfs_byname(const char *); struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *); void vfs_mount_destroy(struct mount *); void vfs_event_signal(fsid_t *, u_int32_t, intptr_t); void vfs_freeopts(struct vfsoptlist *opts); void vfs_deleteopt(struct vfsoptlist *opts, const char *name); int vfs_buildopts(struct uio *auio, struct vfsoptlist **options); int vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, uint64_t val); int vfs_getopt(struct vfsoptlist *, const char *, void **, int *); int vfs_getopt_pos(struct vfsoptlist *opts, const char *name); int vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value); char *vfs_getopts(struct vfsoptlist *, const char *, int *error); int vfs_copyopt(struct vfsoptlist *, const char *, void *, int); int vfs_filteropt(struct vfsoptlist *, const char **legal); void vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...); int vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...); int vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len); int vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len); int vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value); int vfs_setpublicfs /* set publicly exported fs */ (struct mount *, struct netexport *, struct export_args *); void vfs_msync(struct mount *, int); int vfs_busy(struct mount *, int); int vfs_export /* process mount export info */ (struct mount *, struct export_args *); void vfs_allocate_syncvnode(struct mount *); void vfs_deallocate_syncvnode(struct mount *); int vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions); void vfs_getnewfsid(struct mount *); struct cdev *vfs_getrootfsid(struct mount *); struct mount *vfs_getvfs(fsid_t *); /* return vfs given fsid */ struct mount *vfs_busyfs(fsid_t *); int vfs_modevent(module_t, int, void *); void vfs_mount_error(struct mount *, const char *, ...); void vfs_mountroot(void); /* mount our root filesystem */ void vfs_mountedfrom(struct mount *, const char *from); void vfs_notify_upper(struct vnode *, int); void vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp); void vfs_ref(struct mount *); void vfs_rel(struct mount *); struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *, struct ucred *); int vfs_suser(struct mount *, struct thread *); void vfs_unbusy(struct mount *); void vfs_unmountall(void); extern TAILQ_HEAD(mntlist, mount) mountlist; /* mounted filesystem list */ extern struct mtx mountlist_mtx; extern struct nfs_public nfs_pub; extern struct sx vfsconf_sx; #define vfsconf_lock() sx_xlock(&vfsconf_sx) #define vfsconf_unlock() sx_xunlock(&vfsconf_sx) #define vfsconf_slock() sx_slock(&vfsconf_sx) #define vfsconf_sunlock() sx_sunlock(&vfsconf_sx) /* * Declarations for these vfs default operations are located in * kern/vfs_default.c. They will be automatically used to replace * null entries in VFS ops tables when registering a new filesystem * type in the global table. */ vfs_root_t vfs_stdroot; vfs_quotactl_t vfs_stdquotactl; vfs_statfs_t vfs_stdstatfs; vfs_sync_t vfs_stdsync; vfs_sync_t vfs_stdnosync; vfs_vget_t vfs_stdvget; vfs_fhtovp_t vfs_stdfhtovp; vfs_checkexp_t vfs_stdcheckexp; vfs_init_t vfs_stdinit; vfs_uninit_t vfs_stduninit; vfs_extattrctl_t vfs_stdextattrctl; vfs_sysctl_t vfs_stdsysctl; void syncer_suspend(void); void syncer_resume(void); #else /* !_KERNEL */ #include struct stat; __BEGIN_DECLS int fhlink(struct fhandle *, const char *); int fhlinkat(struct fhandle *, int, const char *); int fhopen(const struct fhandle *, int); int fhreadlink(struct fhandle *, char *, size_t); int fhstat(const struct fhandle *, struct stat *); int fhstatfs(const struct fhandle *, struct statfs *); int fstatfs(int, struct statfs *); int getfh(const char *, fhandle_t *); int getfhat(int, char *, struct fhandle *, int); int getfsstat(struct statfs *, long, int); int getmntinfo(struct statfs **, int); int lgetfh(const char *, fhandle_t *); int mount(const char *, const char *, int, void *); int nmount(struct iovec *, unsigned int, int); int statfs(const char *, struct statfs *); int unmount(const char *, int); /* C library stuff */ int getvfsbyname(const char *, struct xvfsconf *); __END_DECLS #endif /* _KERNEL */ #endif /* !_SYS_MOUNT_H_ */