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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)mount.h     8.21 (Berkeley) 5/20/95
   30  * $FreeBSD: releng/5.4/sys/sys/mount.h 145335 2005-04-20 19:11:07Z cvs2svn $
   31  */
   32 
   33 #ifndef _SYS_MOUNT_H_
   34 #define _SYS_MOUNT_H_
   35 
   36 #include <sys/ucred.h>
   37 #include <sys/queue.h>
   38 #ifdef _KERNEL
   39 #include <sys/lockmgr.h>
   40 #include <sys/_lock.h>
   41 #include <sys/_mutex.h>
   42 #endif
   43 
   44 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
   45 
   46 /*
   47  * File identifier.
   48  * These are unique per filesystem on a single machine.
   49  */
   50 #define MAXFIDSZ        16
   51 
   52 struct fid {
   53         u_short         fid_len;                /* length of data in bytes */
   54         u_short         fid_reserved;           /* force longword alignment */
   55         char            fid_data[MAXFIDSZ];     /* data (variable length) */
   56 };
   57 
   58 /*
   59  * filesystem statistics
   60  */
   61 #define MFSNAMELEN      16              /* length of type name including null */
   62 #define MNAMELEN        88              /* size of on/from name bufs */
   63 #define STATFS_VERSION  0x20030518      /* current version number */
   64 struct statfs {
   65         uint32_t f_version;             /* structure version number */
   66         uint32_t f_type;                /* type of filesystem */
   67         uint64_t f_flags;               /* copy of mount exported flags */
   68         uint64_t f_bsize;               /* filesystem fragment size */
   69         uint64_t f_iosize;              /* optimal transfer block size */
   70         uint64_t f_blocks;              /* total data blocks in filesystem */
   71         uint64_t f_bfree;               /* free blocks in filesystem */
   72         int64_t  f_bavail;              /* free blocks avail to non-superuser */
   73         uint64_t f_files;               /* total file nodes in filesystem */
   74         int64_t  f_ffree;               /* free nodes avail to non-superuser */
   75         uint64_t f_syncwrites;          /* count of sync writes since mount */
   76         uint64_t f_asyncwrites;         /* count of async writes since mount */
   77         uint64_t f_syncreads;           /* count of sync reads since mount */
   78         uint64_t f_asyncreads;          /* count of async reads since mount */
   79         uint64_t f_spare[10];           /* unused spare */
   80         uint32_t f_namemax;             /* maximum filename length */
   81         uid_t     f_owner;              /* user that mounted the filesystem */
   82         fsid_t    f_fsid;               /* filesystem id */
   83         char      f_charspare[80];          /* spare string space */
   84         char      f_fstypename[MFSNAMELEN]; /* filesystem type name */
   85         char      f_mntfromname[MNAMELEN];  /* mounted filesystem */
   86         char      f_mntonname[MNAMELEN];    /* directory on which mounted */
   87 };
   88 
   89 #ifdef _KERNEL
   90 #define OMFSNAMELEN     16      /* length of fs type name, including null */
   91 #define OMNAMELEN       (88 - 2 * sizeof(long)) /* size of on/from name bufs */
   92 
   93 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
   94 /* XXX statfs.2 is out of date with read counter changes here. */
   95 struct ostatfs {
   96         long    f_spare2;               /* placeholder */
   97         long    f_bsize;                /* fundamental filesystem block size */
   98         long    f_iosize;               /* optimal transfer block size */
   99         long    f_blocks;               /* total data blocks in filesystem */
  100         long    f_bfree;                /* free blocks in fs */
  101         long    f_bavail;               /* free blocks avail to non-superuser */
  102         long    f_files;                /* total file nodes in filesystem */
  103         long    f_ffree;                /* free file nodes in fs */
  104         fsid_t  f_fsid;                 /* filesystem id */
  105         uid_t   f_owner;                /* user that mounted the filesystem */
  106         int     f_type;                 /* type of filesystem */
  107         int     f_flags;                /* copy of mount exported flags */
  108         long    f_syncwrites;           /* count of sync writes since mount */
  109         long    f_asyncwrites;          /* count of async writes since mount */
  110         char    f_fstypename[OMFSNAMELEN]; /* fs type name */
  111         char    f_mntonname[OMNAMELEN]; /* directory on which mounted */
  112         long    f_syncreads;            /* count of sync reads since mount */
  113         long    f_asyncreads;           /* count of async reads since mount */
  114         short   f_spares1;              /* unused spare */
  115         char    f_mntfromname[OMNAMELEN];/* mounted filesystem */
  116         short   f_spares2;              /* unused spare */
  117         /*
  118          * XXX on machines where longs are aligned to 8-byte boundaries, there
  119          * is an unnamed int32_t here.  This spare was after the apparent end
  120          * of the struct until we bit off the read counters from f_mntonname.
  121          */
  122         long    f_spare[2];             /* unused spare */
  123 };
  124 
  125 #define MMAXOPTIONLEN   65536           /* maximum length of a mount option */
  126 
  127 TAILQ_HEAD(vnodelst, vnode);
  128 TAILQ_HEAD(vfsoptlist, vfsopt);
  129 struct vfsopt {
  130         TAILQ_ENTRY(vfsopt) link;
  131         char    *name;
  132         void    *value;
  133         int     len;
  134 };
  135 
  136 /*
  137  * Structure per mounted filesystem.  Each mounted filesystem has an
  138  * array of operations and an instance record.  The filesystems are
  139  * put on a doubly linked list.
  140  *
  141  */
  142 struct mount {
  143         TAILQ_ENTRY(mount) mnt_list;            /* mount list */
  144         struct vfsops   *mnt_op;                /* operations on fs */
  145         struct vfsconf  *mnt_vfc;               /* configuration info */
  146         struct vnode    *mnt_vnodecovered;      /* vnode we mounted on */
  147         struct vnode    *mnt_syncer;            /* syncer vnode */
  148         struct vnodelst mnt_nvnodelist;         /* list of vnodes this mount */
  149         struct lock     mnt_lock;               /* mount structure lock */
  150         struct mtx      mnt_mtx;                /* mount structure interlock */
  151         int             mnt_writeopcount;       /* write syscalls in progress */
  152         int             mnt_flag;               /* flags shared with user */
  153         struct vfsoptlist *mnt_opt;             /* current mount options */
  154         struct vfsoptlist *mnt_optnew;          /* new options passed to fs */
  155         int             mnt_kern_flag;          /* kernel only flags */
  156         int             mnt_maxsymlinklen;      /* max size of short symlink */
  157         struct statfs   mnt_stat;               /* cache of filesystem stats */
  158         struct ucred    *mnt_cred;              /* credentials of mounter */
  159         void *          mnt_data;               /* private data */
  160         time_t          mnt_time;               /* last time written*/
  161         int             mnt_iosize_max;         /* max size for clusters, etc */
  162         struct netexport *mnt_export;           /* export list */
  163         struct label    *mnt_mntlabel;          /* MAC label for the mount */
  164         struct label    *mnt_fslabel;           /* MAC label for the fs */
  165         int             mnt_nvnodelistsize;     /* # of vnodes on this mount */
  166 };
  167 
  168 struct vnode *__mnt_vnode_next(struct vnode **nvp, struct mount *mp);
  169 
  170 #define MNT_VNODE_FOREACH(vp, mp, vp2) \
  171         for ((vp2) = TAILQ_FIRST(&(mp)->mnt_nvnodelist);        \
  172                 (vp = __mnt_vnode_next(&(vp2), (mp))) != NULL;)
  173 
  174 
  175 #define MNT_ILOCK(mp)   mtx_lock(&(mp)->mnt_mtx)
  176 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
  177 
  178 #endif /* _KERNEL */
  179 
  180 /*
  181  * User specifiable flags.
  182  */
  183 #define MNT_RDONLY      0x00000001      /* read only filesystem */
  184 #define MNT_SYNCHRONOUS 0x00000002      /* filesystem written synchronously */
  185 #define MNT_NOEXEC      0x00000004      /* can't exec from filesystem */
  186 #define MNT_NOSUID      0x00000008      /* don't honor setuid bits on fs */
  187 #define MNT_NODEV       0x00000010      /* don't interpret special files */
  188 #define MNT_UNION       0x00000020      /* union with underlying filesystem */
  189 #define MNT_ASYNC       0x00000040      /* filesystem written asynchronously */
  190 #define MNT_SUIDDIR     0x00100000      /* special handling of SUID on dirs */
  191 #define MNT_SOFTDEP     0x00200000      /* soft updates being done */
  192 #define MNT_NOSYMFOLLOW 0x00400000      /* do not follow symlinks */
  193 #define MNT_JAILDEVFS   0x02000000      /* jail-friendly DEVFS behaviour */
  194 #define MNT_MULTILABEL  0x04000000      /* MAC support for individual objects */
  195 #define MNT_ACLS        0x08000000      /* ACL support enabled */
  196 #define MNT_NOATIME     0x10000000      /* disable update of file access time */
  197 #define MNT_NOCLUSTERR  0x40000000      /* disable cluster read */
  198 #define MNT_NOCLUSTERW  0x80000000      /* disable cluster write */
  199 
  200 /*
  201  * NFS export related mount flags.
  202  */
  203 #define MNT_EXRDONLY    0x00000080      /* exported read only */
  204 #define MNT_EXPORTED    0x00000100      /* filesystem is exported */
  205 #define MNT_DEFEXPORTED 0x00000200      /* exported to the world */
  206 #define MNT_EXPORTANON  0x00000400      /* use anon uid mapping for everyone */
  207 #define MNT_EXKERB      0x00000800      /* exported with Kerberos uid mapping */
  208 #define MNT_EXPUBLIC    0x20000000      /* public export (WebNFS) */
  209 
  210 /*
  211  * Flags set by internal operations,
  212  * but visible to the user.
  213  * XXX some of these are not quite right.. (I've never seen the root flag set)
  214  */
  215 #define MNT_LOCAL       0x00001000      /* filesystem is stored locally */
  216 #define MNT_QUOTA       0x00002000      /* quotas are enabled on filesystem */
  217 #define MNT_ROOTFS      0x00004000      /* identifies the root filesystem */
  218 #define MNT_USER        0x00008000      /* mounted by a user */
  219 #define MNT_IGNORE      0x00800000      /* do not show entry in df */
  220 
  221 /*
  222  * Mask of flags that are visible to statfs().
  223  * XXX I think that this could now become (~(MNT_CMDFLAGS))
  224  * but the 'mount' program may need changing to handle this.
  225  */
  226 #define MNT_VISFLAGMASK (MNT_RDONLY     | MNT_SYNCHRONOUS | MNT_NOEXEC  | \
  227                         MNT_NOSUID      | MNT_NODEV     | MNT_UNION     | \
  228                         MNT_ASYNC       | MNT_EXRDONLY  | MNT_EXPORTED  | \
  229                         MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB    | \
  230                         MNT_LOCAL       | MNT_USER      | MNT_QUOTA     | \
  231                         MNT_ROOTFS      | MNT_NOATIME   | MNT_NOCLUSTERR| \
  232                         MNT_NOCLUSTERW  | MNT_SUIDDIR   | MNT_SOFTDEP   | \
  233                         MNT_IGNORE      | MNT_EXPUBLIC  | MNT_NOSYMFOLLOW | \
  234                         MNT_JAILDEVFS   | MNT_MULTILABEL | MNT_ACLS)
  235 
  236 /* Mask of flags that can be updated. */
  237 #define MNT_UPDATEMASK (MNT_NOSUID      | MNT_NOEXEC    | MNT_NODEV     | \
  238                         MNT_SYNCHRONOUS | MNT_UNION     | MNT_ASYNC     | \
  239                         MNT_NOATIME | \
  240                         MNT_NOSYMFOLLOW | MNT_IGNORE    | MNT_JAILDEVFS | \
  241                         MNT_NOCLUSTERR  | MNT_NOCLUSTERW | MNT_SUIDDIR  | \
  242                         MNT_ACLS        | MNT_USER)
  243 
  244 /*
  245  * External filesystem command modifier flags.
  246  * Unmount can use the MNT_FORCE flag.
  247  * XXX These are not STATES and really should be somewhere else.
  248  */
  249 #define MNT_UPDATE      0x00010000      /* not a real mount, just an update */
  250 #define MNT_DELEXPORT   0x00020000      /* delete export host lists */
  251 #define MNT_RELOAD      0x00040000      /* reload filesystem data */
  252 #define MNT_FORCE       0x00080000      /* force unmount or readonly change */
  253 #define MNT_SNAPSHOT    0x01000000      /* snapshot the filesystem */
  254 #define MNT_BYFSID      0x08000000      /* specify filesystem by ID. */
  255 #define MNT_CMDFLAGS   (MNT_UPDATE      | MNT_DELEXPORT | MNT_RELOAD    | \
  256                         MNT_FORCE       | MNT_SNAPSHOT  | MNT_BYFSID)
  257 /*
  258  * Internal filesystem control flags stored in mnt_kern_flag.
  259  *
  260  * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
  261  * past the mount point.  This keeps the subtree stable during mounts
  262  * and unmounts.
  263  *
  264  * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
  265  * dounmount() is still waiting to lock the mountpoint. This allows
  266  * the filesystem to cancel operations that might otherwise deadlock
  267  * with the unmount attempt (used by NFS).
  268  */
  269 #define MNTK_UNMOUNTF   0x00000001      /* forced unmount in progress */
  270 #define MNTK_UNMOUNT    0x01000000      /* unmount in progress */
  271 #define MNTK_MWAIT      0x02000000      /* waiting for unmount to finish */
  272 #define MNTK_WANTRDWR   0x04000000      /* upgrade to read/write requested */
  273 #define MNTK_SUSPEND    0x08000000      /* request write suspension */
  274 #define MNTK_SUSPENDED  0x10000000      /* write operations are suspended */
  275 
  276 /*
  277  * Sysctl CTL_VFS definitions.
  278  *
  279  * Second level identifier specifies which filesystem. Second level
  280  * identifier VFS_VFSCONF returns information about all filesystems.
  281  * Second level identifier VFS_GENERIC is non-terminal.
  282  */
  283 #define VFS_VFSCONF             0       /* get configured filesystems */
  284 #define VFS_GENERIC             0       /* generic filesystem information */
  285 /*
  286  * Third level identifiers for VFS_GENERIC are given below; third
  287  * level identifiers for specific filesystems are given in their
  288  * mount specific header files.
  289  */
  290 #define VFS_MAXTYPENUM  1       /* int: highest defined filesystem type */
  291 #define VFS_CONF        2       /* struct: vfsconf for filesystem given
  292                                    as next argument */
  293 
  294 /*
  295  * Flags for various system call interfaces.
  296  *
  297  * waitfor flags to vfs_sync() and getfsstat()
  298  */
  299 #define MNT_WAIT        1       /* synchronously wait for I/O to complete */
  300 #define MNT_NOWAIT      2       /* start all I/O, but do not wait for it */
  301 #define MNT_LAZY        3       /* push data not written by filesystem syncer */
  302 
  303 /*
  304  * Generic file handle
  305  */
  306 struct fhandle {
  307         fsid_t  fh_fsid;        /* Filesystem id of mount point */
  308         struct  fid fh_fid;     /* Filesys specific id */
  309 };
  310 typedef struct fhandle  fhandle_t;
  311 
  312 /*
  313  * Export arguments for local filesystem mount calls.
  314  */
  315 struct export_args {
  316         int     ex_flags;               /* export related flags */
  317         uid_t   ex_root;                /* mapping for root uid */
  318         struct  xucred ex_anon;         /* mapping for anonymous user */
  319         struct  sockaddr *ex_addr;      /* net address to which exported */
  320         u_char  ex_addrlen;             /* and the net address length */
  321         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  322         u_char  ex_masklen;             /* and the smask length */
  323         char    *ex_indexfile;          /* index file for WebNFS URLs */
  324 };
  325 
  326 /*
  327  * Structure holding information for a publicly exported filesystem
  328  * (WebNFS). Currently the specs allow just for one such filesystem.
  329  */
  330 struct nfs_public {
  331         int             np_valid;       /* Do we hold valid information */
  332         fhandle_t       np_handle;      /* Filehandle for pub fs (internal) */
  333         struct mount    *np_mount;      /* Mountpoint of exported fs */
  334         char            *np_index;      /* Index file */
  335 };
  336 
  337 /*
  338  * Filesystem configuration information. One of these exists for each
  339  * type of filesystem supported by the kernel. These are searched at
  340  * mount time to identify the requested filesystem.
  341  *
  342  * XXX: Never change the first two arguments!
  343  */
  344 struct vfsconf {
  345         u_int   vfc_version;            /* ABI version number */
  346         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  347         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  348         int     vfc_typenum;            /* historic filesystem type number */
  349         int     vfc_refcount;           /* number mounted of this type */
  350         int     vfc_flags;              /* permanent flags */
  351         struct  vfsoptdecl *vfc_opts;   /* mount options */
  352         TAILQ_ENTRY(vfsconf) vfc_list;  /* list of vfscons */
  353 };
  354 
  355 /* Userland version of the struct vfsconf. */
  356 struct xvfsconf {
  357         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  358         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  359         int     vfc_typenum;            /* historic filesystem type number */
  360         int     vfc_refcount;           /* number mounted of this type */
  361         int     vfc_flags;              /* permanent flags */
  362         struct  vfsconf *vfc_next;      /* next in list */
  363 };
  364 
  365 #ifndef BURN_BRIDGES
  366 struct ovfsconf {
  367         void    *vfc_vfsops;
  368         char    vfc_name[32];
  369         int     vfc_index;
  370         int     vfc_refcount;
  371         int     vfc_flags;
  372 };
  373 #endif
  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 typedef uint32_t fsctlop_t;
  387 
  388 struct vfsidctl {
  389         int             vc_vers;        /* should be VFSIDCTL_VERS1 (below) */
  390         fsid_t          vc_fsid;        /* fsid to operate on. */
  391         char            vc_fstypename[MFSNAMELEN];
  392                                         /* type of fs 'nfs' or '*' */
  393         fsctlop_t       vc_op;          /* operation VFS_CTL_* (below) */
  394         void            *vc_ptr;        /* pointer to data structure. */
  395         size_t          vc_len;         /* sizeof said structure. */
  396         u_int32_t       vc_spare[12];   /* spare (must be zero). */
  397 };
  398 
  399 /* vfsidctl API version. */
  400 #define VFS_CTL_VERS1   0x01
  401 
  402 /*
  403  * New style VFS sysctls, do not reuse/conflict with the namespace for
  404  * private sysctls.
  405  * All "global" sysctl ops have the 33rd bit set:
  406  * 0x...1....
  407  * Private sysctl ops should have the 33rd bit unset.
  408  */
  409 #define VFS_CTL_QUERY   0x00010001      /* anything wrong? (vfsquery) */
  410 #define VFS_CTL_TIMEO   0x00010002      /* set timeout for vfs notification */
  411 #define VFS_CTL_NOLOCKS 0x00010003      /* disable file locking */
  412 
  413 struct vfsquery {
  414         u_int32_t       vq_flags;
  415         u_int32_t       vq_spare[31];
  416 };
  417 
  418 /* vfsquery flags */
  419 #define VQ_NOTRESP      0x0001  /* server down */
  420 #define VQ_NEEDAUTH     0x0002  /* server bad auth */
  421 #define VQ_LOWDISK      0x0004  /* we're low on space */
  422 #define VQ_MOUNT        0x0008  /* new filesystem arrived */
  423 #define VQ_UNMOUNT      0x0010  /* filesystem has left */
  424 #define VQ_DEAD         0x0020  /* filesystem is dead, needs force unmount */
  425 #define VQ_ASSIST       0x0040  /* filesystem needs assistance from external
  426                                    program */
  427 #define VQ_NOTRESPLOCK  0x0080  /* server lockd down */
  428 #define VQ_FLAG0100     0x0100  /* placeholder */
  429 #define VQ_FLAG0200     0x0200  /* placeholder */
  430 #define VQ_FLAG0400     0x0400  /* placeholder */
  431 #define VQ_FLAG0800     0x0800  /* placeholder */
  432 #define VQ_FLAG1000     0x1000  /* placeholder */
  433 #define VQ_FLAG2000     0x2000  /* placeholder */
  434 #define VQ_FLAG4000     0x4000  /* placeholder */
  435 #define VQ_FLAG8000     0x8000  /* placeholder */
  436 
  437 #ifdef _KERNEL
  438 /* Point a sysctl request at a vfsidctl's data. */
  439 #define VCTLTOREQ(vc, req)                                              \
  440         do {                                                            \
  441                 (req)->newptr = (vc)->vc_ptr;                           \
  442                 (req)->newlen = (vc)->vc_len;                           \
  443                 (req)->newidx = 0;                                      \
  444         } while (0)
  445 #endif
  446 
  447 struct iovec;
  448 struct uio;
  449 
  450 #ifdef _KERNEL
  451 
  452 #ifdef MALLOC_DECLARE
  453 MALLOC_DECLARE(M_MOUNT);
  454 #endif
  455 extern int maxvfsconf;          /* highest defined filesystem type */
  456 extern int nfs_mount_type;      /* vfc_typenum for nfs, or -1 */
  457 
  458 TAILQ_HEAD(vfsconfhead, vfsconf);
  459 extern struct vfsconfhead vfsconf;
  460 
  461 /*
  462  * Operations supported on mounted filesystem.
  463  */
  464 struct mount_args;
  465 struct nameidata;
  466 struct sysctl_req;
  467 
  468 typedef int vfs_omount_t(struct mount *mp, char *path, caddr_t data,
  469                          struct thread *td);
  470 typedef int vfs_start_t(struct mount *mp, int flags, struct thread *td);
  471 typedef int vfs_unmount_t(struct mount *mp, int mntflags, struct thread *td);
  472 typedef int vfs_root_t(struct mount *mp, struct vnode **vpp, struct thread *td);
  473 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid,
  474                     caddr_t arg, struct thread *td);
  475 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp,
  476                     struct thread *td);
  477 typedef int vfs_sync_t(struct mount *mp, int waitfor, struct ucred *cred,
  478                     struct thread *td);
  479 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
  480                     struct vnode **vpp);
  481 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp);
  482 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
  483                     int *extflagsp, struct ucred **credanonp);
  484 typedef int vfs_vptofh_t(struct vnode *vp, struct fid *fhp);
  485 typedef int vfs_init_t(struct vfsconf *);
  486 typedef int vfs_uninit_t(struct vfsconf *);
  487 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
  488                     struct vnode *filename_vp, int attrnamespace,
  489                     const char *attrname, struct thread *td);
  490 typedef int vfs_mount_t(struct mount *mp, struct thread *td);
  491 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
  492                     struct sysctl_req *req);
  493 
  494 struct vfsops {
  495         vfs_mount_t             *vfs_mount;
  496         vfs_omount_t            *vfs_omount;
  497         vfs_start_t             *vfs_start;
  498         vfs_unmount_t           *vfs_unmount;
  499         vfs_root_t              *vfs_root;
  500         vfs_quotactl_t          *vfs_quotactl;
  501         vfs_statfs_t            *vfs_statfs;
  502         vfs_sync_t              *vfs_sync;
  503         vfs_vget_t              *vfs_vget;
  504         vfs_fhtovp_t            *vfs_fhtovp;
  505         vfs_checkexp_t          *vfs_checkexp;
  506         vfs_vptofh_t            *vfs_vptofh;
  507         vfs_init_t              *vfs_init;
  508         vfs_uninit_t            *vfs_uninit;
  509         vfs_extattrctl_t        *vfs_extattrctl;
  510         /* Additions below are not binary compatible with 5.0 and below. */
  511         vfs_sysctl_t            *vfs_sysctl;
  512 };
  513 
  514 #define VFS_MOUNT(MP, P)    (*(MP)->mnt_op->vfs_mount)(MP, P)
  515 #define VFS_OMOUNT(MP, PATH, DATA, P) \
  516         (*(MP)->mnt_op->vfs_omount)(MP, PATH, DATA, P)
  517 #define VFS_START(MP, FLAGS, P)   (*(MP)->mnt_op->vfs_start)(MP, FLAGS, P)
  518 #define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P)
  519 #define VFS_ROOT(MP, VPP, P)      (*(MP)->mnt_op->vfs_root)(MP, VPP, P)
  520 #define VFS_QUOTACTL(MP,C,U,A,P)  (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P)
  521 #define VFS_STATFS(MP, SBP, P)    (*(MP)->mnt_op->vfs_statfs)(MP, SBP, P)
  522 #define VFS_SYNC(MP, WAIT, C, P)  (*(MP)->mnt_op->vfs_sync)(MP, WAIT, C, P)
  523 #define VFS_VGET(MP, INO, FLAGS, VPP) \
  524         (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP)
  525 #define VFS_FHTOVP(MP, FIDP, VPP) \
  526         (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP)
  527 #define VFS_VPTOFH(VP, FIDP)      (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP)
  528 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \
  529         (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED)
  530 #define VFS_EXTATTRCTL(MP, C, FN, NS, N, P) \
  531         (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N, P)
  532 #define VFS_SYSCTL(MP, OP, REQ) \
  533         (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ)
  534 
  535 #include <sys/module.h>
  536 
  537 /*
  538  * Version numbers.
  539  */
  540 #define VFS_VERSION_00  0x19660120
  541 #define VFS_VERSION     VFS_VERSION_00
  542 
  543 #define VFS_SET(vfsops, fsname, flags) \
  544         static struct vfsconf fsname ## _vfsconf = {            \
  545                 .vfc_version = VFS_VERSION,                     \
  546                 .vfc_name = #fsname,                            \
  547                 .vfc_vfsops = &vfsops,                          \
  548                 .vfc_typenum = -1,                              \
  549                 .vfc_flags = flags,                             \
  550         };                                                      \
  551         static moduledata_t fsname ## _mod = {                  \
  552                 #fsname,                                        \
  553                 vfs_modevent,                                   \
  554                 & fsname ## _vfsconf                            \
  555         };                                                      \
  556         DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
  557 
  558 extern  char *mountrootfsname;
  559 
  560 /*
  561  * exported vnode operations
  562  */
  563 int     dounmount(struct mount *, int, struct thread *);
  564 int     kernel_mount(struct iovec *, u_int, int);
  565 int     kernel_vmount(int flags, ...);
  566 struct vfsconf *vfs_byname(const char *);
  567 void    vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
  568 int     vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
  569 int     vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
  570 int     vfs_mount(struct thread *, const char *, char *, int, void *);
  571 int     vfs_setpublicfs                     /* set publicly exported fs */
  572             (struct mount *, struct netexport *, struct export_args *);
  573 int     vfs_lock(struct mount *);         /* lock a vfs */
  574 void    vfs_msync(struct mount *, int);
  575 void    vfs_unlock(struct mount *);       /* unlock a vfs */
  576 int     vfs_busy(struct mount *, int, struct mtx *, struct thread *);
  577 int     vfs_export                       /* process mount export info */
  578             (struct mount *, struct export_args *);
  579 struct  netcred *vfs_export_lookup          /* lookup host in fs export list */
  580             (struct mount *, struct sockaddr *);
  581 int     vfs_allocate_syncvnode(struct mount *);
  582 void    vfs_getnewfsid(struct mount *);
  583 struct cdev *vfs_getrootfsid(struct mount *);
  584 struct  mount *vfs_getvfs(fsid_t *);      /* return vfs given fsid */
  585 int     vfs_modevent(module_t, int, void *);
  586 int     vfs_mountedon(struct vnode *);    /* is a vfs mounted on vp */
  587 void    vfs_mountroot(void);                    /* mount our root filesystem */
  588 int     vfs_rootmountalloc(char *, char *, struct mount **);
  589 void    vfs_mount_destroy(struct mount *, struct thread *);
  590 int     vfs_suser(struct mount *, struct thread *);
  591 void    vfs_unbusy(struct mount *, struct thread *);
  592 void    vfs_unmountall(void);
  593 int     vfs_register(struct vfsconf *);
  594 int     vfs_unregister(struct vfsconf *);
  595 extern  TAILQ_HEAD(mntlist, mount) mountlist;   /* mounted filesystem list */
  596 extern  struct mtx mountlist_mtx;
  597 extern  struct nfs_public nfs_pub;
  598 
  599 /*
  600  * Declarations for these vfs default operations are located in
  601  * kern/vfs_default.c, they should be used instead of making "dummy"
  602  * functions or casting entries in the VFS op table to "enopnotsupp()".
  603  */
  604 vfs_start_t             vfs_stdstart;
  605 vfs_root_t              vfs_stdroot;
  606 vfs_quotactl_t          vfs_stdquotactl;
  607 vfs_statfs_t            vfs_stdstatfs;
  608 vfs_sync_t              vfs_stdsync;
  609 vfs_sync_t              vfs_stdnosync;
  610 vfs_vget_t              vfs_stdvget;
  611 vfs_fhtovp_t            vfs_stdfhtovp;
  612 vfs_checkexp_t          vfs_stdcheckexp;
  613 vfs_vptofh_t            vfs_stdvptofh;
  614 vfs_init_t              vfs_stdinit;
  615 vfs_uninit_t            vfs_stduninit;
  616 vfs_extattrctl_t        vfs_stdextattrctl;
  617 vfs_sysctl_t            vfs_stdsysctl;
  618 
  619 /* XXX - these should be indirect functions!!! */
  620 int     softdep_fsync(struct vnode *);
  621 int     softdep_process_worklist(struct mount *);
  622 
  623 #else /* !_KERNEL */
  624 
  625 #include <sys/cdefs.h>
  626 
  627 struct stat;
  628 
  629 __BEGIN_DECLS
  630 int     fhopen(const struct fhandle *, int);
  631 int     fhstat(const struct fhandle *, struct stat *);
  632 int     fhstatfs(const struct fhandle *, struct statfs *);
  633 int     fstatfs(int, struct statfs *);
  634 int     getfh(const char *, fhandle_t *);
  635 int     getfsstat(struct statfs *, long, int);
  636 int     getmntinfo(struct statfs **, int);
  637 int     lgetfh(const char *, fhandle_t *);
  638 int     mount(const char *, const char *, int, void *);
  639 int     nmount(struct iovec *, unsigned int, int);
  640 int     statfs(const char *, struct statfs *);
  641 int     unmount(const char *, int);
  642 
  643 /* C library stuff */
  644 int     getvfsbyname(const char *, struct xvfsconf *);
  645 __END_DECLS
  646 
  647 #endif /* _KERNEL */
  648 
  649 #endif /* !_SYS_MOUNT_H_ */

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