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: src/sys/sys/mount.h,v 1.152 2003/11/12 08:01:40 mckusick Exp $
   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/_lock.h>
   45 #include <sys/_mutex.h>
   46 #endif
   47 
   48 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
   49 
   50 /*
   51  * File identifier.
   52  * These are unique per filesystem on a single machine.
   53  */
   54 #define MAXFIDSZ        16
   55 
   56 struct fid {
   57         u_short         fid_len;                /* length of data in bytes */
   58         u_short         fid_reserved;           /* force longword alignment */
   59         char            fid_data[MAXFIDSZ];     /* data (variable length) */
   60 };
   61 
   62 /*
   63  * filesystem statistics
   64  */
   65 #define MFSNAMELEN      16              /* length of type name including null */
   66 #define MNAMELEN        88              /* size of on/from name bufs */
   67 #define STATFS_VERSION  0x20030518      /* current version number */
   68 struct statfs {
   69         uint32_t f_version;             /* structure version number */
   70         uint32_t f_type;                /* type of filesystem */
   71         uint64_t f_flags;               /* copy of mount exported flags */
   72         uint64_t f_bsize;               /* filesystem fragment size */
   73         uint64_t f_iosize;              /* optimal transfer block size */
   74         uint64_t f_blocks;              /* total data blocks in filesystem */
   75         uint64_t f_bfree;               /* free blocks in filesystem */
   76         int64_t  f_bavail;              /* free blocks avail to non-superuser */
   77         uint64_t f_files;               /* total file nodes in filesystem */
   78         int64_t  f_ffree;               /* free nodes avail to non-superuser */
   79         uint64_t f_syncwrites;          /* count of sync writes since mount */
   80         uint64_t f_asyncwrites;         /* count of async writes since mount */
   81         uint64_t f_syncreads;           /* count of sync reads since mount */
   82         uint64_t f_asyncreads;          /* count of async reads since mount */
   83         uint64_t f_spare[10];           /* unused spare */
   84         uint32_t f_namemax;             /* maximum filename length */
   85         uid_t     f_owner;              /* user that mounted the filesystem */
   86         fsid_t    f_fsid;               /* filesystem id */
   87         char      f_charspare[80];          /* spare string space */
   88         char      f_fstypename[MFSNAMELEN]; /* filesystem type name */
   89         char      f_mntfromname[MNAMELEN];  /* mounted filesystem */
   90         char      f_mntonname[MNAMELEN];    /* directory on which mounted */
   91 };
   92 
   93 #ifdef _KERNEL
   94 #define OMFSNAMELEN     16      /* length of fs type name, including null */
   95 #define OMNAMELEN       (88 - 2 * sizeof(long)) /* size of on/from name bufs */
   96 
   97 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
   98 /* XXX statfs.2 is out of date with read counter changes here. */
   99 struct ostatfs {
  100         long    f_spare2;               /* placeholder */
  101         long    f_bsize;                /* fundamental filesystem block size */
  102         long    f_iosize;               /* optimal transfer block size */
  103         long    f_blocks;               /* total data blocks in filesystem */
  104         long    f_bfree;                /* free blocks in fs */
  105         long    f_bavail;               /* free blocks avail to non-superuser */
  106         long    f_files;                /* total file nodes in filesystem */
  107         long    f_ffree;                /* free file nodes in fs */
  108         fsid_t  f_fsid;                 /* filesystem id */
  109         uid_t   f_owner;                /* user that mounted the filesystem */
  110         int     f_type;                 /* type of filesystem */
  111         int     f_flags;                /* copy of mount exported flags */
  112         long    f_syncwrites;           /* count of sync writes since mount */
  113         long    f_asyncwrites;          /* count of async writes since mount */
  114         char    f_fstypename[OMFSNAMELEN]; /* fs type name */
  115         char    f_mntonname[OMNAMELEN]; /* directory on which mounted */
  116         long    f_syncreads;            /* count of sync reads since mount */
  117         long    f_asyncreads;           /* count of async reads since mount */
  118         short   f_spares1;              /* unused spare */
  119         char    f_mntfromname[OMNAMELEN];/* mounted filesystem */
  120         short   f_spares2;              /* unused spare */
  121         /*
  122          * XXX on machines where longs are aligned to 8-byte boundaries, there
  123          * is an unnamed int32_t here.  This spare was after the apparent end
  124          * of the struct until we bit off the read counters from f_mntonname.
  125          */
  126         long    f_spare[2];             /* unused spare */
  127 };
  128 
  129 #define MMAXOPTIONLEN   65536           /* maximum length of a mount option */
  130 
  131 TAILQ_HEAD(vnodelst, vnode);
  132 TAILQ_HEAD(vfsoptlist, vfsopt);
  133 struct vfsopt {
  134         TAILQ_ENTRY(vfsopt) link;
  135         char    *name;
  136         void    *value;
  137         int     len;
  138 };
  139 
  140 /*
  141  * Structure per mounted filesystem.  Each mounted filesystem has an
  142  * array of operations and an instance record.  The filesystems are
  143  * put on a doubly linked list.
  144  *
  145  * NOTE: mnt_nvnodelist and mnt_reservedvnlist.  At the moment vnodes
  146  * are linked into mnt_nvnodelist.  At some point in the near future the
  147  * vnode list will be split into a 'dirty' and 'clean' list. mnt_nvnodelist
  148  * will become the dirty list and mnt_reservedvnlist will become the 'clean'
  149  * list.  Filesystem kld's syncing code should remain compatible since
  150  * they only need to scan the dirty vnode list (nvnodelist -> dirtyvnodelist).
  151  */
  152 struct mount {
  153         TAILQ_ENTRY(mount) mnt_list;            /* mount list */
  154         struct vfsops   *mnt_op;                /* operations on fs */
  155         struct vfsconf  *mnt_vfc;               /* configuration info */
  156         struct vnode    *mnt_vnodecovered;      /* vnode we mounted on */
  157         struct vnode    *mnt_syncer;            /* syncer vnode */
  158         struct vnodelst mnt_nvnodelist;         /* list of vnodes this mount */
  159         struct vnodelst mnt_reservedvnlist;     /* (future) dirty vnode list */
  160         struct lock     mnt_lock;               /* mount structure lock */
  161         struct mtx      mnt_mtx;                /* mount structure interlock */
  162         int             mnt_writeopcount;       /* write syscalls in progress */
  163         int             mnt_flag;               /* flags shared with user */
  164         struct vfsoptlist *mnt_opt;             /* current mount options */
  165         struct vfsoptlist *mnt_optnew;          /* new options passed to fs */
  166         int             mnt_kern_flag;          /* kernel only flags */
  167         int             mnt_maxsymlinklen;      /* max size of short symlink */
  168         struct statfs   mnt_stat;               /* cache of filesystem stats */
  169         struct ucred    *mnt_cred;              /* credentials of mounter */
  170         qaddr_t         mnt_data;               /* private data */
  171         time_t          mnt_time;               /* last time written*/
  172         int             mnt_iosize_max;         /* max size for clusters, etc */
  173         struct netexport *mnt_export;           /* export list */
  174         struct label    *mnt_mntlabel;          /* MAC label for the mount */
  175         struct label    *mnt_fslabel;           /* MAC label for the fs */
  176         int             mnt_nvnodelistsize;     /* # of vnodes on this mount */
  177 };
  178 
  179 
  180 #define MNT_ILOCK(mp)   mtx_lock(&(mp)->mnt_mtx)
  181 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
  182 
  183 #endif /* _KERNEL */
  184 
  185 /*
  186  * User specifiable flags.
  187  */
  188 #define MNT_RDONLY      0x00000001      /* read only filesystem */
  189 #define MNT_SYNCHRONOUS 0x00000002      /* filesystem written synchronously */
  190 #define MNT_NOEXEC      0x00000004      /* can't exec from filesystem */
  191 #define MNT_NOSUID      0x00000008      /* don't honor setuid bits on fs */
  192 #define MNT_NODEV       0x00000010      /* don't interpret special files */
  193 #define MNT_UNION       0x00000020      /* union with underlying filesystem */
  194 #define MNT_ASYNC       0x00000040      /* filesystem written asynchronously */
  195 #define MNT_SUIDDIR     0x00100000      /* special handling of SUID on dirs */
  196 #define MNT_SOFTDEP     0x00200000      /* soft updates being done */
  197 #define MNT_NOSYMFOLLOW 0x00400000      /* do not follow symlinks */
  198 #define MNT_JAILDEVFS   0x02000000      /* jail-friendly DEVFS behaviour */
  199 #define MNT_MULTILABEL  0x04000000      /* MAC support for individual objects */
  200 #define MNT_ACLS        0x08000000      /* ACL support enabled */
  201 #define MNT_NOATIME     0x10000000      /* disable update of file access time */
  202 #define MNT_NOCLUSTERR  0x40000000      /* disable cluster read */
  203 #define MNT_NOCLUSTERW  0x80000000      /* disable cluster write */
  204 
  205 /*
  206  * NFS export related mount flags.
  207  */
  208 #define MNT_EXRDONLY    0x00000080      /* exported read only */
  209 #define MNT_EXPORTED    0x00000100      /* filesystem is exported */
  210 #define MNT_DEFEXPORTED 0x00000200      /* exported to the world */
  211 #define MNT_EXPORTANON  0x00000400      /* use anon uid mapping for everyone */
  212 #define MNT_EXKERB      0x00000800      /* exported with Kerberos uid mapping */
  213 #define MNT_EXPUBLIC    0x20000000      /* public export (WebNFS) */
  214 
  215 /*
  216  * Flags set by internal operations,
  217  * but visible to the user.
  218  * XXX some of these are not quite right.. (I've never seen the root flag set)
  219  */
  220 #define MNT_LOCAL       0x00001000      /* filesystem is stored locally */
  221 #define MNT_QUOTA       0x00002000      /* quotas are enabled on filesystem */
  222 #define MNT_ROOTFS      0x00004000      /* identifies the root filesystem */
  223 #define MNT_USER        0x00008000      /* mounted by a user */
  224 #define MNT_IGNORE      0x00800000      /* do not show entry in df */
  225 
  226 /*
  227  * Mask of flags that are visible to statfs().
  228  * XXX I think that this could now become (~(MNT_CMDFLAGS))
  229  * but the 'mount' program may need changing to handle this.
  230  */
  231 #define MNT_VISFLAGMASK (MNT_RDONLY     | MNT_SYNCHRONOUS | MNT_NOEXEC  | \
  232                         MNT_NOSUID      | MNT_NODEV     | MNT_UNION     | \
  233                         MNT_ASYNC       | MNT_EXRDONLY  | MNT_EXPORTED  | \
  234                         MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB    | \
  235                         MNT_LOCAL       | MNT_USER      | MNT_QUOTA     | \
  236                         MNT_ROOTFS      | MNT_NOATIME   | MNT_NOCLUSTERR| \
  237                         MNT_NOCLUSTERW  | MNT_SUIDDIR   | MNT_SOFTDEP   | \
  238                         MNT_IGNORE      | MNT_EXPUBLIC  | MNT_NOSYMFOLLOW | \
  239                         MNT_JAILDEVFS   | MNT_MULTILABEL | MNT_ACLS)
  240 
  241 /* Mask of flags that can be updated. */
  242 #define MNT_UPDATEMASK (MNT_NOSUID      | MNT_NOEXEC    | MNT_NODEV     | \
  243                         MNT_SYNCHRONOUS | MNT_UNION     | MNT_ASYNC     | \
  244                         MNT_NOATIME | \
  245                         MNT_NOSYMFOLLOW | MNT_IGNORE    | MNT_JAILDEVFS | \
  246                         MNT_NOCLUSTERR  | MNT_NOCLUSTERW | MNT_SUIDDIR  | \
  247                         MNT_ACLS )
  248 
  249 /*
  250  * External filesystem command modifier flags.
  251  * Unmount can use the MNT_FORCE flag.
  252  * XXX These are not STATES and really should be somewhere else.
  253  */
  254 #define MNT_UPDATE      0x00010000      /* not a real mount, just an update */
  255 #define MNT_DELEXPORT   0x00020000      /* delete export host lists */
  256 #define MNT_RELOAD      0x00040000      /* reload filesystem data */
  257 #define MNT_FORCE       0x00080000      /* force unmount or readonly change */
  258 #define MNT_SNAPSHOT    0x01000000      /* snapshot the filesystem */
  259 #define MNT_BYFSID      0x08000000      /* specify filesystem by ID. */
  260 #define MNT_CMDFLAGS   (MNT_UPDATE      | MNT_DELEXPORT | MNT_RELOAD    | \
  261                         MNT_FORCE       | MNT_SNAPSHOT  | MNT_BYFSID)
  262 /*
  263  * Internal filesystem control flags stored in mnt_kern_flag.
  264  *
  265  * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
  266  * past the mount point.  This keeps the subtree stable during mounts
  267  * and unmounts.
  268  *
  269  * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
  270  * dounmount() is still waiting to lock the mountpoint. This allows
  271  * the filesystem to cancel operations that might otherwise deadlock
  272  * with the unmount attempt (used by NFS).
  273  */
  274 #define MNTK_UNMOUNTF   0x00000001      /* forced unmount in progress */
  275 #define MNTK_UNMOUNT    0x01000000      /* unmount in progress */
  276 #define MNTK_MWAIT      0x02000000      /* waiting for unmount to finish */
  277 #define MNTK_WANTRDWR   0x04000000      /* upgrade to read/write requested */
  278 #define MNTK_SUSPEND    0x08000000      /* request write suspension */
  279 #define MNTK_SUSPENDED  0x10000000      /* write operations are suspended */
  280 
  281 /*
  282  * Sysctl CTL_VFS definitions.
  283  *
  284  * Second level identifier specifies which filesystem. Second level
  285  * identifier VFS_VFSCONF returns information about all filesystems.
  286  * Second level identifier VFS_GENERIC is non-terminal.
  287  */
  288 #define VFS_VFSCONF             0       /* get configured filesystems */
  289 #define VFS_GENERIC             0       /* generic filesystem information */
  290 /*
  291  * Third level identifiers for VFS_GENERIC are given below; third
  292  * level identifiers for specific filesystems are given in their
  293  * mount specific header files.
  294  */
  295 #define VFS_MAXTYPENUM  1       /* int: highest defined filesystem type */
  296 #define VFS_CONF        2       /* struct: vfsconf for filesystem given
  297                                    as next argument */
  298 
  299 /*
  300  * Flags for various system call interfaces.
  301  *
  302  * waitfor flags to vfs_sync() and getfsstat()
  303  */
  304 #define MNT_WAIT        1       /* synchronously wait for I/O to complete */
  305 #define MNT_NOWAIT      2       /* start all I/O, but do not wait for it */
  306 #define MNT_LAZY        3       /* push data not written by filesystem syncer */
  307 
  308 /*
  309  * Generic file handle
  310  */
  311 struct fhandle {
  312         fsid_t  fh_fsid;        /* Filesystem id of mount point */
  313         struct  fid fh_fid;     /* Filesys specific id */
  314 };
  315 typedef struct fhandle  fhandle_t;
  316 
  317 /*
  318  * Export arguments for local filesystem mount calls.
  319  */
  320 struct export_args {
  321         int     ex_flags;               /* export related flags */
  322         uid_t   ex_root;                /* mapping for root uid */
  323         struct  xucred ex_anon;         /* mapping for anonymous user */
  324         struct  sockaddr *ex_addr;      /* net address to which exported */
  325         u_char  ex_addrlen;             /* and the net address length */
  326         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  327         u_char  ex_masklen;             /* and the smask length */
  328         char    *ex_indexfile;          /* index file for WebNFS URLs */
  329 };
  330 
  331 /*
  332  * Structure holding information for a publicly exported filesystem
  333  * (WebNFS). Currently the specs allow just for one such filesystem.
  334  */
  335 struct nfs_public {
  336         int             np_valid;       /* Do we hold valid information */
  337         fhandle_t       np_handle;      /* Filehandle for pub fs (internal) */
  338         struct mount    *np_mount;      /* Mountpoint of exported fs */
  339         char            *np_index;      /* Index file */
  340 };
  341 
  342 /*
  343  * Filesystem configuration information. One of these exists for each
  344  * type of filesystem supported by the kernel. These are searched at
  345  * mount time to identify the requested filesystem.
  346  */
  347 struct vfsconf {
  348         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  349         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  350         int     vfc_typenum;            /* historic filesystem type number */
  351         int     vfc_refcount;           /* number mounted of this type */
  352         int     vfc_flags;              /* permanent flags */
  353         struct  vfsoptdecl *vfc_opts;   /* mount options */
  354         struct  vfsconf *vfc_next;      /* next in list */
  355 };
  356 
  357 /* Userland version of the struct vfsconf. */
  358 struct xvfsconf {
  359         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  360         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  361         int     vfc_typenum;            /* historic filesystem type number */
  362         int     vfc_refcount;           /* number mounted of this type */
  363         int     vfc_flags;              /* permanent flags */
  364         struct  vfsconf *vfc_next;      /* next in list */
  365 };
  366 
  367 struct ovfsconf {
  368         void    *vfc_vfsops;
  369         char    vfc_name[32];
  370         int     vfc_index;
  371         int     vfc_refcount;
  372         int     vfc_flags;
  373 };
  374 
  375 /*
  376  * NB: these flags refer to IMPLEMENTATION properties, not properties of
  377  * any actual mounts; i.e., it does not make sense to change the flags.
  378  */
  379 #define VFCF_STATIC     0x00010000      /* statically compiled into kernel */
  380 #define VFCF_NETWORK    0x00020000      /* may get data over the network */
  381 #define VFCF_READONLY   0x00040000      /* writes are not implemented */
  382 #define VFCF_SYNTHETIC  0x00080000      /* data does not represent real files */
  383 #define VFCF_LOOPBACK   0x00100000      /* aliases some other mounted FS */
  384 #define VFCF_UNICODE    0x00200000      /* stores file names as Unicode*/
  385 
  386 struct iovec;
  387 struct uio;
  388 
  389 #ifdef _KERNEL
  390 
  391 #ifdef MALLOC_DECLARE
  392 MALLOC_DECLARE(M_MOUNT);
  393 #endif
  394 extern int maxvfsconf;          /* highest defined filesystem type */
  395 extern int nfs_mount_type;      /* vfc_typenum for nfs, or -1 */
  396 extern struct vfsconf *vfsconf; /* head of list of filesystem types */
  397 
  398 /*
  399  * Operations supported on mounted filesystem.
  400  */
  401 struct mount_args;
  402 struct nameidata;
  403 
  404 typedef int vfs_mount_t(struct mount *mp, char *path, caddr_t data,
  405                         struct nameidata *ndp, struct thread *td);
  406 typedef int vfs_start_t(struct mount *mp, int flags, struct thread *td);
  407 typedef int vfs_unmount_t(struct mount *mp, int mntflags, struct thread *td);
  408 typedef int vfs_root_t(struct mount *mp, struct vnode **vpp);
  409 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid,
  410                     caddr_t arg, struct thread *td);
  411 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp,
  412                     struct thread *td);
  413 typedef int vfs_sync_t(struct mount *mp, int waitfor, struct ucred *cred,
  414                     struct thread *td);
  415 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
  416                     struct vnode **vpp);
  417 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp);
  418 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
  419                     int *extflagsp, struct ucred **credanonp);
  420 typedef int vfs_vptofh_t(struct vnode *vp, struct fid *fhp);
  421 typedef int vfs_init_t(struct vfsconf *);
  422 typedef int vfs_uninit_t(struct vfsconf *);
  423 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
  424                     struct vnode *filename_vp, int attrnamespace,
  425                     const char *attrname, struct thread *td);
  426 typedef int vfs_nmount_t(struct mount *mp, struct nameidata *ndp,
  427                     struct thread *td);
  428 
  429 struct vfsops {
  430         vfs_mount_t             *vfs_mount;
  431         vfs_start_t             *vfs_start;
  432         vfs_unmount_t           *vfs_unmount;
  433         vfs_root_t              *vfs_root;
  434         vfs_quotactl_t          *vfs_quotactl;
  435         vfs_statfs_t            *vfs_statfs;
  436         vfs_sync_t              *vfs_sync;
  437         vfs_vget_t              *vfs_vget;
  438         vfs_fhtovp_t            *vfs_fhtovp;
  439         vfs_checkexp_t          *vfs_checkexp;
  440         vfs_vptofh_t            *vfs_vptofh;
  441         vfs_init_t              *vfs_init;
  442         vfs_uninit_t            *vfs_uninit;
  443         vfs_extattrctl_t        *vfs_extattrctl;
  444         /* Additions below are not binary compatible with 5.0 and below. */
  445         vfs_nmount_t            *vfs_nmount;
  446 };
  447 
  448 #define VFS_NMOUNT(MP, NDP, P)    (*(MP)->mnt_op->vfs_nmount)(MP, NDP, P)
  449 #define VFS_MOUNT(MP, PATH, DATA, NDP, P) \
  450         (*(MP)->mnt_op->vfs_mount)(MP, PATH, DATA, NDP, P)
  451 #define VFS_START(MP, FLAGS, P)   (*(MP)->mnt_op->vfs_start)(MP, FLAGS, P)
  452 #define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P)
  453 #define VFS_ROOT(MP, VPP)         (*(MP)->mnt_op->vfs_root)(MP, VPP)
  454 #define VFS_QUOTACTL(MP,C,U,A,P)  (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P)
  455 #define VFS_STATFS(MP, SBP, P)    (*(MP)->mnt_op->vfs_statfs)(MP, SBP, P)
  456 #define VFS_SYNC(MP, WAIT, C, P)  (*(MP)->mnt_op->vfs_sync)(MP, WAIT, C, P)
  457 #define VFS_VGET(MP, INO, FLAGS, VPP) \
  458         (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP)
  459 #define VFS_FHTOVP(MP, FIDP, VPP) \
  460         (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP)
  461 #define VFS_VPTOFH(VP, FIDP)      (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP)
  462 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \
  463         (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED)
  464 #define VFS_EXTATTRCTL(MP, C, FN, NS, N, P) \
  465         (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N, P)
  466 
  467 #include <sys/module.h>
  468 
  469 #define VFS_SET(vfsops, fsname, flags) \
  470         static struct vfsconf fsname ## _vfsconf = {            \
  471                 &vfsops,                                        \
  472                 #fsname,                                        \
  473                 -1,                                             \
  474                 0,                                              \
  475                 flags                                           \
  476         };                                                      \
  477         static moduledata_t fsname ## _mod = {                  \
  478                 #fsname,                                        \
  479                 vfs_modevent,                                   \
  480                 & fsname ## _vfsconf                            \
  481         };                                                      \
  482         DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
  483 
  484 extern  char *mountrootfsname;
  485 
  486 /*
  487  * exported vnode operations
  488  */
  489 int     dounmount(struct mount *, int, struct thread *td);
  490 int     kernel_mount(struct iovec *iovp, unsigned int iovcnt, int flags);
  491 int     kernel_vmount(int flags, ...);
  492 int     vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
  493 int     vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
  494 int     vfs_mount(struct thread *td, const char *type, char *path,
  495             int flags, void *data);
  496 int     vfs_setpublicfs                     /* set publicly exported fs */
  497             (struct mount *, struct netexport *, struct export_args *);
  498 int     vfs_lock(struct mount *);         /* lock a vfs */
  499 void    vfs_msync(struct mount *, int);
  500 void    vfs_unlock(struct mount *);       /* unlock a vfs */
  501 int     vfs_busy(struct mount *, int, struct mtx *, struct thread *td);
  502 int     vfs_export                       /* process mount export info */
  503             (struct mount *, struct export_args *);
  504 struct  netcred *vfs_export_lookup          /* lookup host in fs export list */
  505             (struct mount *, struct sockaddr *);
  506 int     vfs_allocate_syncvnode(struct mount *);
  507 void    vfs_getnewfsid(struct mount *);
  508 dev_t   vfs_getrootfsid(struct mount *);
  509 struct  mount *vfs_getvfs(fsid_t *);      /* return vfs given fsid */
  510 int     vfs_modevent(module_t, int, void *);
  511 int     vfs_mountedon(struct vnode *);    /* is a vfs mounted on vp */
  512 void    vfs_mountroot(void);                    /* mount our root filesystem */
  513 int     vfs_rootmountalloc(char *, char *, struct mount **);
  514 void    vfs_mount_destroy(struct mount *, struct thread *);
  515 void    vfs_unbusy(struct mount *, struct thread *td);
  516 void    vfs_unmountall(void);
  517 int     vfs_register(struct vfsconf *);
  518 int     vfs_unregister(struct vfsconf *);
  519 extern  TAILQ_HEAD(mntlist, mount) mountlist;   /* mounted filesystem list */
  520 extern  struct mtx mountlist_mtx;
  521 extern  struct nfs_public nfs_pub;
  522 
  523 /*
  524  * Declarations for these vfs default operations are located in
  525  * kern/vfs_default.c, they should be used instead of making "dummy"
  526  * functions or casting entries in the VFS op table to "enopnotsupp()".
  527  */
  528 vfs_start_t             vfs_stdstart;
  529 vfs_root_t              vfs_stdroot;
  530 vfs_quotactl_t          vfs_stdquotactl;
  531 vfs_statfs_t            vfs_stdstatfs;
  532 vfs_sync_t              vfs_stdsync;
  533 vfs_sync_t              vfs_stdnosync;
  534 vfs_vget_t              vfs_stdvget;
  535 vfs_fhtovp_t            vfs_stdfhtovp;
  536 vfs_checkexp_t          vfs_stdcheckexp;
  537 vfs_vptofh_t            vfs_stdvptofh;
  538 vfs_init_t              vfs_stdinit;
  539 vfs_uninit_t            vfs_stduninit;
  540 vfs_extattrctl_t        vfs_stdextattrctl;
  541 
  542 /* XXX - these should be indirect functions!!! */
  543 int     softdep_fsync(struct vnode *);
  544 int     softdep_process_worklist(struct mount *);
  545 
  546 #else /* !_KERNEL */
  547 
  548 #include <sys/cdefs.h>
  549 
  550 struct stat;
  551 
  552 __BEGIN_DECLS
  553 int     fhopen(const struct fhandle *, int);
  554 int     fhstat(const struct fhandle *, struct stat *);
  555 int     fhstatfs(const struct fhandle *, struct statfs *);
  556 int     fstatfs(int, struct statfs *);
  557 int     getfh(const char *, fhandle_t *);
  558 int     getfsstat(struct statfs *, long, int);
  559 int     getmntinfo(struct statfs **, int);
  560 int     mount(const char *, const char *, int, void *);
  561 int     nmount(struct iovec *, u_int, int);
  562 int     statfs(const char *, struct statfs *);
  563 int     unmount(const char *, int);
  564 
  565 /* C library stuff */
  566 void    endvfsent(void);
  567 struct  ovfsconf *getvfsbytype(int);
  568 struct  ovfsconf *getvfsent(void);
  569 int     getvfsbyname(const char *, struct xvfsconf *);
  570 void    setvfsent(int);
  571 int     vfsisloadable(const char *);
  572 int     vfsload(const char *);
  573 __END_DECLS
  574 
  575 #endif /* _KERNEL */
  576 
  577 #endif /* !_SYS_MOUNT_H_ */

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