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 /*
    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. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)mount.h     8.21 (Berkeley) 5/20/95
   34  * $FreeBSD: releng/5.0/sys/sys/mount.h 106582 2002-11-07 21:45:28Z mux $
   35  */
   36 
   37 #ifndef _SYS_MOUNT_H_
   38 #define _SYS_MOUNT_H_
   39 
   40 #include <sys/ucred.h>
   41 #include <sys/queue.h>
   42 #ifdef _KERNEL
   43 #include <sys/lockmgr.h>
   44 #include <sys/_label.h>
   45 #include <sys/_lock.h>
   46 #include <sys/_mutex.h>
   47 #endif
   48 
   49 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
   50 
   51 /*
   52  * File identifier.
   53  * These are unique per filesystem on a single machine.
   54  */
   55 #define MAXFIDSZ        16
   56 
   57 struct fid {
   58         u_short         fid_len;                /* length of data in bytes */
   59         u_short         fid_reserved;           /* force longword alignment */
   60         char            fid_data[MAXFIDSZ];     /* data (variable length) */
   61 };
   62 
   63 /*
   64  * filesystem statistics
   65  */
   66 
   67 #define MFSNAMELEN      16      /* length of fs type name, including null */
   68 #define MNAMELEN        (88 - 2 * sizeof(long)) /* size of on/from name bufs */
   69 
   70 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
   71 /* XXX statfs.2 is out of date with read counter changes here. */
   72 struct statfs {
   73         long    f_spare2;               /* placeholder */
   74         long    f_bsize;                /* fundamental filesystem block size */
   75         long    f_iosize;               /* optimal transfer block size */
   76         long    f_blocks;               /* total data blocks in filesystem */
   77         long    f_bfree;                /* free blocks in fs */
   78         long    f_bavail;               /* free blocks avail to non-superuser */
   79         long    f_files;                /* total file nodes in filesystem */
   80         long    f_ffree;                /* free file nodes in fs */
   81         fsid_t  f_fsid;                 /* filesystem id */
   82         uid_t   f_owner;                /* user that mounted the filesystem */
   83         int     f_type;                 /* type of filesystem */
   84         int     f_flags;                /* copy of mount exported flags */
   85         long    f_syncwrites;           /* count of sync writes since mount */
   86         long    f_asyncwrites;          /* count of async writes since mount */
   87         char    f_fstypename[MFSNAMELEN]; /* fs type name */
   88         char    f_mntonname[MNAMELEN];  /* directory on which mounted */
   89         long    f_syncreads;            /* count of sync reads since mount */
   90         long    f_asyncreads;           /* count of async reads since mount */
   91         short   f_spares1;              /* unused spare */
   92         char    f_mntfromname[MNAMELEN];/* mounted filesystem */
   93         short   f_spares2;              /* unused spare */
   94         /*
   95          * XXX on machines where longs are aligned to 8-byte boundaries, there
   96          * is an unnamed int32_t here.  This spare was after the apparent end
   97          * of the struct until we bit off the read counters from f_mntonname.
   98          */
   99         long    f_spare[2];             /* unused spare */
  100 };
  101 
  102 #ifdef _KERNEL
  103 #define MMAXOPTIONLEN   65536           /* maximum length of a mount option */
  104 
  105 TAILQ_HEAD(vnodelst, vnode);
  106 TAILQ_HEAD(vfsoptlist, vfsopt);
  107 struct vfsopt {
  108         TAILQ_ENTRY(vfsopt) link;
  109         char    *name;
  110         void    *value;
  111         int     len;
  112 };
  113 
  114 /*
  115  * Structure per mounted filesystem.  Each mounted filesystem has an
  116  * array of operations and an instance record.  The filesystems are
  117  * put on a doubly linked list.
  118  *
  119  * NOTE: mnt_nvnodelist and mnt_reservedvnlist.  At the moment vnodes
  120  * are linked into mnt_nvnodelist.  At some point in the near future the
  121  * vnode list will be split into a 'dirty' and 'clean' list. mnt_nvnodelist
  122  * will become the dirty list and mnt_reservedvnlist will become the 'clean'
  123  * list.  Filesystem kld's syncing code should remain compatible since
  124  * they only need to scan the dirty vnode list (nvnodelist -> dirtyvnodelist).
  125  */
  126 struct mount {
  127         TAILQ_ENTRY(mount) mnt_list;            /* mount list */
  128         struct vfsops   *mnt_op;                /* operations on fs */
  129         struct vfsconf  *mnt_vfc;               /* configuration info */
  130         struct vnode    *mnt_vnodecovered;      /* vnode we mounted on */
  131         struct vnode    *mnt_syncer;            /* syncer vnode */
  132         struct vnodelst mnt_nvnodelist;         /* list of vnodes this mount */
  133         struct vnodelst mnt_reservedvnlist;     /* (future) dirty vnode list */
  134         struct lock     mnt_lock;               /* mount structure lock */
  135         int             mnt_writeopcount;       /* write syscalls in progress */
  136         int             mnt_flag;               /* flags shared with user */
  137         struct vfsoptlist *mnt_opt;             /* current mount options */
  138         struct vfsoptlist *mnt_optnew;          /* new options passed to fs */
  139         int             mnt_kern_flag;          /* kernel only flags */
  140         int             mnt_maxsymlinklen;      /* max size of short symlink */
  141         struct statfs   mnt_stat;               /* cache of filesystem stats */
  142         struct ucred    *mnt_cred;              /* credentials of mounter */
  143         qaddr_t         mnt_data;               /* private data */
  144         time_t          mnt_time;               /* last time written*/
  145         int             mnt_iosize_max;         /* max size for clusters, etc */
  146         struct netexport *mnt_export;           /* export list */
  147         struct label    mnt_mntlabel;           /* MAC label for the mount */
  148         struct label    mnt_fslabel;            /* MAC label for the fs */
  149 };
  150 #endif /* _KERNEL */
  151 
  152 /*
  153  * User specifiable flags.
  154  */
  155 #define MNT_RDONLY      0x00000001      /* read only filesystem */
  156 #define MNT_SYNCHRONOUS 0x00000002      /* filesystem written synchronously */
  157 #define MNT_NOEXEC      0x00000004      /* can't exec from filesystem */
  158 #define MNT_NOSUID      0x00000008      /* don't honor setuid bits on fs */
  159 #define MNT_NODEV       0x00000010      /* don't interpret special files */
  160 #define MNT_UNION       0x00000020      /* union with underlying filesystem */
  161 #define MNT_ASYNC       0x00000040      /* filesystem written asynchronously */
  162 #define MNT_SUIDDIR     0x00100000      /* special handling of SUID on dirs */
  163 #define MNT_SOFTDEP     0x00200000      /* soft updates being done */
  164 #define MNT_NOSYMFOLLOW 0x00400000      /* do not follow symlinks */
  165 #define MNT_JAILDEVFS   0x02000000      /* jail-friendly DEVFS behaviour */
  166 #define MNT_MULTILABEL  0x04000000      /* MAC support for individual objects */
  167 #define MNT_ACLS        0x08000000      /* ACL support enabled */
  168 #define MNT_NOATIME     0x10000000      /* disable update of file access time */
  169 #define MNT_NOCLUSTERR  0x40000000      /* disable cluster read */
  170 #define MNT_NOCLUSTERW  0x80000000      /* disable cluster write */
  171 
  172 /*
  173  * NFS export related mount flags.
  174  */
  175 #define MNT_EXRDONLY    0x00000080      /* exported read only */
  176 #define MNT_EXPORTED    0x00000100      /* filesystem is exported */
  177 #define MNT_DEFEXPORTED 0x00000200      /* exported to the world */
  178 #define MNT_EXPORTANON  0x00000400      /* use anon uid mapping for everyone */
  179 #define MNT_EXKERB      0x00000800      /* exported with Kerberos uid mapping */
  180 #define MNT_EXPUBLIC    0x20000000      /* public export (WebNFS) */
  181 
  182 /*
  183  * Flags set by internal operations,
  184  * but visible to the user.
  185  * XXX some of these are not quite right.. (I've never seen the root flag set)
  186  */
  187 #define MNT_LOCAL       0x00001000      /* filesystem is stored locally */
  188 #define MNT_QUOTA       0x00002000      /* quotas are enabled on filesystem */
  189 #define MNT_ROOTFS      0x00004000      /* identifies the root filesystem */
  190 #define MNT_USER        0x00008000      /* mounted by a user */
  191 #define MNT_IGNORE      0x00800000      /* do not show entry in df */
  192 
  193 /*
  194  * Mask of flags that are visible to statfs().
  195  * XXX I think that this could now become (~(MNT_CMDFLAGS))
  196  * but the 'mount' program may need changing to handle this.
  197  */
  198 #define MNT_VISFLAGMASK (MNT_RDONLY     | MNT_SYNCHRONOUS | MNT_NOEXEC  | \
  199                         MNT_NOSUID      | MNT_NODEV     | MNT_UNION     | \
  200                         MNT_ASYNC       | MNT_EXRDONLY  | MNT_EXPORTED  | \
  201                         MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB    | \
  202                         MNT_LOCAL       | MNT_USER      | MNT_QUOTA     | \
  203                         MNT_ROOTFS      | MNT_NOATIME   | MNT_NOCLUSTERR| \
  204                         MNT_NOCLUSTERW  | MNT_SUIDDIR   | MNT_SOFTDEP   | \
  205                         MNT_IGNORE      | MNT_EXPUBLIC  | MNT_NOSYMFOLLOW | \
  206                         MNT_JAILDEVFS   | MNT_MULTILABEL | MNT_ACLS)
  207 
  208 /* Mask of flags that can be updated. */
  209 #define MNT_UPDATEMASK (MNT_NOSUID      | MNT_NOEXEC    | MNT_NODEV     | \
  210                         MNT_SYNCHRONOUS | MNT_UNION     | MNT_ASYNC     | \
  211                         MNT_NOATIME | \
  212                         MNT_NOSYMFOLLOW | MNT_IGNORE    | MNT_JAILDEVFS | \
  213                         MNT_NOCLUSTERR  | MNT_NOCLUSTERW | MNT_SUIDDIR)
  214   
  215 /*
  216  * External filesystem command modifier flags.
  217  * Unmount can use the MNT_FORCE flag.
  218  * XXX These are not STATES and really should be somewhere else.
  219  */
  220 #define MNT_UPDATE      0x00010000      /* not a real mount, just an update */
  221 #define MNT_DELEXPORT   0x00020000      /* delete export host lists */
  222 #define MNT_RELOAD      0x00040000      /* reload filesystem data */
  223 #define MNT_FORCE       0x00080000      /* force unmount or readonly change */
  224 #define MNT_SNAPSHOT    0x01000000      /* snapshot the filesystem */
  225 #define MNT_CMDFLAGS   (MNT_UPDATE      | MNT_DELEXPORT | MNT_RELOAD    | \
  226                         MNT_FORCE       | MNT_SNAPSHOT)
  227 /*
  228  * Still available
  229  */
  230 #define MNT_SPARE3      0x08000000
  231 /*
  232  * Internal filesystem control flags stored in mnt_kern_flag.
  233  *
  234  * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
  235  * past the mount point.  This keeps the subtree stable during mounts
  236  * and unmounts.
  237  *
  238  * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
  239  * dounmount() is still waiting to lock the mountpoint. This allows
  240  * the filesystem to cancel operations that might otherwise deadlock
  241  * with the unmount attempt (used by NFS).
  242  */
  243 #define MNTK_UNMOUNTF   0x00000001      /* forced unmount in progress */
  244 #define MNTK_UNMOUNT    0x01000000      /* unmount in progress */
  245 #define MNTK_MWAIT      0x02000000      /* waiting for unmount to finish */
  246 #define MNTK_WANTRDWR   0x04000000      /* upgrade to read/write requested */
  247 #define MNTK_SUSPEND    0x08000000      /* request write suspension */
  248 #define MNTK_SUSPENDED  0x10000000      /* write operations are suspended */
  249 
  250 /*
  251  * Sysctl CTL_VFS definitions.
  252  *
  253  * Second level identifier specifies which filesystem. Second level
  254  * identifier VFS_VFSCONF returns information about all filesystems.
  255  * Second level identifier VFS_GENERIC is non-terminal.
  256  */
  257 #define VFS_VFSCONF             0       /* get configured filesystems */
  258 #define VFS_GENERIC             0       /* generic filesystem information */
  259 /*
  260  * Third level identifiers for VFS_GENERIC are given below; third
  261  * level identifiers for specific filesystems are given in their
  262  * mount specific header files.
  263  */
  264 #define VFS_MAXTYPENUM  1       /* int: highest defined filesystem type */
  265 #define VFS_CONF        2       /* struct: vfsconf for filesystem given
  266                                    as next argument */
  267 
  268 /*
  269  * Flags for various system call interfaces.
  270  *
  271  * waitfor flags to vfs_sync() and getfsstat()
  272  */
  273 #define MNT_WAIT        1       /* synchronously wait for I/O to complete */
  274 #define MNT_NOWAIT      2       /* start all I/O, but do not wait for it */
  275 #define MNT_LAZY        3       /* push data not written by filesystem syncer */
  276 
  277 /*
  278  * Generic file handle
  279  */
  280 struct fhandle {
  281         fsid_t  fh_fsid;        /* Filesystem id of mount point */
  282         struct  fid fh_fid;     /* Filesys specific id */
  283 };
  284 typedef struct fhandle  fhandle_t;
  285 
  286 /*
  287  * Export arguments for local filesystem mount calls.
  288  */
  289 struct export_args {
  290         int     ex_flags;               /* export related flags */
  291         uid_t   ex_root;                /* mapping for root uid */
  292         struct  xucred ex_anon;         /* mapping for anonymous user */
  293         struct  sockaddr *ex_addr;      /* net address to which exported */
  294         u_char  ex_addrlen;             /* and the net address length */
  295         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  296         u_char  ex_masklen;             /* and the smask length */
  297         char    *ex_indexfile;          /* index file for WebNFS URLs */
  298 };
  299 
  300 /*
  301  * Structure holding information for a publicly exported filesystem
  302  * (WebNFS). Currently the specs allow just for one such filesystem.
  303  */
  304 struct nfs_public {
  305         int             np_valid;       /* Do we hold valid information */
  306         fhandle_t       np_handle;      /* Filehandle for pub fs (internal) */
  307         struct mount    *np_mount;      /* Mountpoint of exported fs */
  308         char            *np_index;      /* Index file */
  309 };
  310 
  311 /*
  312  * Filesystem configuration information. One of these exists for each
  313  * type of filesystem supported by the kernel. These are searched at
  314  * mount time to identify the requested filesystem.
  315  */
  316 struct vfsconf {
  317         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  318         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  319         int     vfc_typenum;            /* historic filesystem type number */
  320         int     vfc_refcount;           /* number mounted of this type */
  321         int     vfc_flags;              /* permanent flags */
  322         struct  vfsoptdecl *vfc_opts;   /* mount options */
  323         struct  vfsconf *vfc_next;      /* next in list */
  324 };
  325 
  326 /* Userland version of the struct vfsconf. */
  327 struct xvfsconf {
  328         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  329         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  330         int     vfc_typenum;            /* historic filesystem type number */
  331         int     vfc_refcount;           /* number mounted of this type */
  332         int     vfc_flags;              /* permanent flags */
  333         struct  vfsconf *vfc_next;      /* next in list */
  334 };
  335 
  336 struct ovfsconf {
  337         void    *vfc_vfsops;
  338         char    vfc_name[32];
  339         int     vfc_index;
  340         int     vfc_refcount;
  341         int     vfc_flags;
  342 };
  343 
  344 /*
  345  * NB: these flags refer to IMPLEMENTATION properties, not properties of
  346  * any actual mounts; i.e., it does not make sense to change the flags.
  347  */
  348 #define VFCF_STATIC     0x00010000      /* statically compiled into kernel */
  349 #define VFCF_NETWORK    0x00020000      /* may get data over the network */
  350 #define VFCF_READONLY   0x00040000      /* writes are not implemented */
  351 #define VFCF_SYNTHETIC  0x00080000      /* data does not represent real files */
  352 #define VFCF_LOOPBACK   0x00100000      /* aliases some other mounted FS */
  353 #define VFCF_UNICODE    0x00200000      /* stores file names as Unicode*/
  354 
  355 struct iovec;
  356 struct uio;
  357 
  358 #ifdef _KERNEL
  359 
  360 #ifdef MALLOC_DECLARE
  361 MALLOC_DECLARE(M_MOUNT);
  362 #endif
  363 extern int maxvfsconf;          /* highest defined filesystem type */
  364 extern int nfs_mount_type;      /* vfc_typenum for nfs, or -1 */
  365 extern struct vfsconf *vfsconf; /* head of list of filesystem types */
  366 
  367 /*
  368  * Operations supported on mounted filesystem.
  369  */
  370 struct mount_args;
  371 struct nameidata;
  372 
  373 typedef int vfs_mount_t(struct mount *mp, char *path, caddr_t data,
  374                         struct nameidata *ndp, struct thread *td);
  375 typedef int vfs_start_t(struct mount *mp, int flags, struct thread *td);
  376 typedef int vfs_unmount_t(struct mount *mp, int mntflags, struct thread *td);
  377 typedef int vfs_root_t(struct mount *mp, struct vnode **vpp);
  378 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid,
  379                     caddr_t arg, struct thread *td);
  380 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp,
  381                     struct thread *td);
  382 typedef int vfs_sync_t(struct mount *mp, int waitfor, struct ucred *cred,
  383                     struct thread *td);
  384 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
  385                     struct vnode **vpp);
  386 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp);
  387 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
  388                     int *extflagsp, struct ucred **credanonp);
  389 typedef int vfs_vptofh_t(struct vnode *vp, struct fid *fhp);
  390 typedef int vfs_init_t(struct vfsconf *);
  391 typedef int vfs_uninit_t(struct vfsconf *);
  392 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
  393                     struct vnode *filename_vp, int attrnamespace,
  394                     const char *attrname, struct thread *td);
  395 typedef int vfs_nmount_t(struct mount *mp, struct nameidata *ndp,
  396                     struct thread *td);
  397 
  398 struct vfsops {
  399         vfs_mount_t             *vfs_mount;
  400         vfs_start_t             *vfs_start;
  401         vfs_unmount_t           *vfs_unmount;
  402         vfs_root_t              *vfs_root;
  403         vfs_quotactl_t          *vfs_quotactl;
  404         vfs_statfs_t            *vfs_statfs;
  405         vfs_sync_t              *vfs_sync;
  406         vfs_vget_t              *vfs_vget;
  407         vfs_fhtovp_t            *vfs_fhtovp;
  408         vfs_checkexp_t          *vfs_checkexp;
  409         vfs_vptofh_t            *vfs_vptofh;
  410         vfs_init_t              *vfs_init;
  411         vfs_uninit_t            *vfs_uninit;
  412         vfs_extattrctl_t        *vfs_extattrctl;
  413         /* Additions below are not binary compatible with 5.0 and below. */
  414         vfs_nmount_t            *vfs_nmount;
  415 };
  416 
  417 #define VFS_NMOUNT(MP, NDP, P)    (*(MP)->mnt_op->vfs_nmount)(MP, NDP, P)
  418 #define VFS_MOUNT(MP, PATH, DATA, NDP, P) \
  419         (*(MP)->mnt_op->vfs_mount)(MP, PATH, DATA, NDP, P)
  420 #define VFS_START(MP, FLAGS, P)   (*(MP)->mnt_op->vfs_start)(MP, FLAGS, P)
  421 #define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P)
  422 #define VFS_ROOT(MP, VPP)         (*(MP)->mnt_op->vfs_root)(MP, VPP)
  423 #define VFS_QUOTACTL(MP,C,U,A,P)  (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P)
  424 #define VFS_STATFS(MP, SBP, P)    (*(MP)->mnt_op->vfs_statfs)(MP, SBP, P)
  425 #define VFS_SYNC(MP, WAIT, C, P)  (*(MP)->mnt_op->vfs_sync)(MP, WAIT, C, P)
  426 #define VFS_VGET(MP, INO, FLAGS, VPP) \
  427         (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP)
  428 #define VFS_FHTOVP(MP, FIDP, VPP) \
  429         (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP)
  430 #define VFS_VPTOFH(VP, FIDP)      (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP)
  431 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \
  432         (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED)
  433 #define VFS_EXTATTRCTL(MP, C, FN, NS, N, P) \
  434         (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N, P)
  435 
  436 #include <sys/module.h>
  437 
  438 #define VFS_SET(vfsops, fsname, flags) \
  439         static struct vfsconf fsname ## _vfsconf = {            \
  440                 &vfsops,                                        \
  441                 #fsname,                                        \
  442                 -1,                                             \
  443                 0,                                              \
  444                 flags                                           \
  445         };                                                      \
  446         static moduledata_t fsname ## _mod = {                  \
  447                 #fsname,                                        \
  448                 vfs_modevent,                                   \
  449                 & fsname ## _vfsconf                            \
  450         };                                                      \
  451         DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
  452 
  453 extern  char *mountrootfsname;
  454 
  455 /*
  456  * exported vnode operations
  457  */
  458 int     dounmount(struct mount *, int, struct thread *td);
  459 int     kernel_mount(struct iovec *iovp, unsigned int iovcnt, int flags);
  460 int     kernel_vmount(int flags, ...);
  461 int     vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
  462 int     vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
  463 int     vfs_mount(struct thread *td, const char *type, char *path,
  464             int flags, void *data);
  465 int     vfs_setpublicfs                     /* set publicly exported fs */
  466             (struct mount *, struct netexport *, struct export_args *);
  467 int     vfs_lock(struct mount *);         /* lock a vfs */
  468 void    vfs_msync(struct mount *, int);
  469 void    vfs_unlock(struct mount *);       /* unlock a vfs */
  470 int     vfs_busy(struct mount *, int, struct mtx *, struct thread *td);
  471 int     vfs_export                       /* process mount export info */
  472             (struct mount *, struct export_args *);
  473 struct  netcred *vfs_export_lookup          /* lookup host in fs export list */
  474             (struct mount *, struct sockaddr *);
  475 int     vfs_allocate_syncvnode(struct mount *);
  476 void    vfs_getnewfsid(struct mount *);
  477 dev_t   vfs_getrootfsid(struct mount *);
  478 struct  mount *vfs_getvfs(fsid_t *);      /* return vfs given fsid */
  479 int     vfs_modevent(module_t, int, void *);
  480 int     vfs_mountedon(struct vnode *);    /* is a vfs mounted on vp */
  481 void    vfs_mountroot(void);                    /* mount our root filesystem */
  482 int     vfs_rootmountalloc(char *, char *, struct mount **);
  483 void    vfs_unbusy(struct mount *, struct thread *td);
  484 void    vfs_unmountall(void);
  485 int     vfs_register(struct vfsconf *);
  486 int     vfs_unregister(struct vfsconf *);
  487 extern  TAILQ_HEAD(mntlist, mount) mountlist;   /* mounted filesystem list */
  488 extern  struct mtx mountlist_mtx;
  489 extern  struct nfs_public nfs_pub;
  490 
  491 /* 
  492  * Declarations for these vfs default operations are located in 
  493  * kern/vfs_default.c, they should be used instead of making "dummy" 
  494  * functions or casting entries in the VFS op table to "enopnotsupp()".
  495  */ 
  496 vfs_start_t             vfs_stdstart;
  497 vfs_root_t              vfs_stdroot;
  498 vfs_quotactl_t          vfs_stdquotactl;
  499 vfs_statfs_t            vfs_stdstatfs;
  500 vfs_sync_t              vfs_stdsync;
  501 vfs_vget_t              vfs_stdvget;
  502 vfs_fhtovp_t            vfs_stdfhtovp;
  503 vfs_checkexp_t          vfs_stdcheckexp;
  504 vfs_vptofh_t            vfs_stdvptofh;
  505 vfs_init_t              vfs_stdinit;
  506 vfs_uninit_t            vfs_stduninit;
  507 vfs_extattrctl_t        vfs_stdextattrctl;
  508 
  509 /* XXX - these should be indirect functions!!! */
  510 int     softdep_fsync(struct vnode *);
  511 int     softdep_process_worklist(struct mount *);
  512 
  513 #else /* !_KERNEL */
  514 
  515 #include <sys/cdefs.h>
  516 
  517 struct stat;
  518 
  519 __BEGIN_DECLS
  520 int     fhopen(const struct fhandle *, int);
  521 int     fhstat(const struct fhandle *, struct stat *);
  522 int     fhstatfs(const struct fhandle *, struct statfs *);
  523 int     fstatfs(int, struct statfs *);
  524 int     getfh(const char *, fhandle_t *);
  525 int     getfsstat(struct statfs *, long, int);
  526 int     getmntinfo(struct statfs **, int);
  527 int     mount(const char *, const char *, int, void *);
  528 int     nmount(struct iovec *, u_int, int);
  529 int     statfs(const char *, struct statfs *);
  530 int     unmount(const char *, int);
  531 
  532 /* C library stuff */
  533 void    endvfsent(void);
  534 struct  ovfsconf *getvfsbytype(int);
  535 struct  ovfsconf *getvfsent(void);
  536 int     getvfsbyname(const char *, struct xvfsconf *);
  537 void    setvfsent(int);
  538 int     vfsisloadable(const char *);
  539 int     vfsload(const char *);
  540 __END_DECLS
  541 
  542 #endif /* _KERNEL */
  543 
  544 #endif /* !_SYS_MOUNT_H_ */

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