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/6.3/sys/sys/mount.h 173886 2007-11-24 19:45:58Z 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 
  129 struct vfsoptlist;
  130 struct vfsopt;
  131 
  132 /*
  133  * Structure per mounted filesystem.  Each mounted filesystem has an
  134  * array of operations and an instance record.  The filesystems are
  135  * put on a doubly linked list.
  136  *
  137  * Lock reference:
  138  *      m - mountlist_mtx
  139  *      i - interlock
  140  *      l - mnt_lock
  141  *
  142  * Unmarked fields are considered stable as long as a ref is held.
  143  *
  144  */
  145 struct mount {
  146 #define mnt_startzero   mnt_list
  147         TAILQ_ENTRY(mount) mnt_list;            /* (m) mount list */
  148         struct vfsops   *mnt_op;                /* operations on fs */
  149         struct vfsconf  *mnt_vfc;               /* configuration info */
  150         struct vnode    *mnt_vnodecovered;      /* vnode we mounted on */
  151         struct vnode    *mnt_syncer;            /* syncer vnode */
  152         struct vnodelst mnt_nvnodelist;         /* (i) list of vnodes */
  153 #define mnt_endzero     mnt_lock
  154         struct lock     mnt_lock;               /* mount structure lock */
  155         struct mtx      mnt_mtx;                /* mount structure interlock */
  156 #define mnt_startzero2  mnt_writeopcount
  157         int             mnt_writeopcount;       /* (i) write syscalls pending */
  158         u_int           mnt_flag;               /* (i) flags shared with user */
  159         struct vfsoptlist *mnt_opt;             /* current mount options */
  160         struct vfsoptlist *mnt_optnew;          /* new options passed to fs */
  161         int             mnt_kern_flag;          /* (i) kernel only flags */
  162         int             mnt_maxsymlinklen;      /* max size of short symlink */
  163         struct statfs   mnt_stat;               /* cache of filesystem stats */
  164         struct ucred    *mnt_cred;              /* credentials of mounter */
  165         void *          mnt_data;               /* private data */
  166         time_t          mnt_time;               /* last time written*/
  167         int             mnt_iosize_max;         /* max size for clusters, etc */
  168         struct netexport *mnt_export;           /* export list */
  169         struct label    *mnt_mntlabel;          /* MAC label for the mount */
  170         struct label    *mnt_fslabel;           /* MAC label for the fs */
  171         int             mnt_nvnodelistsize;     /* (i) # of vnodes */
  172         u_int           mnt_hashseed;           /* Random seed for vfs_hash */
  173         int             mnt_markercnt;          /* marker vnodes in use */
  174         int             mnt_holdcnt;            /* hold count */
  175         int             mnt_holdcntwaiters;     /* waits on hold count */
  176         int             mnt_secondary_writes;   /* (i) # of secondary writes */
  177 #define mnt_endzero2    mnt_secondary_accwrites
  178         int             mnt_secondary_accwrites;/* (i) secondary wr. starts */
  179         int             mnt_ref;                /* (i) Reference count */
  180         int             mnt_gen;                /* struct mount generation */
  181 };
  182 
  183 struct vnode *__mnt_vnode_next(struct vnode **mvp, struct mount *mp);
  184 struct vnode *__mnt_vnode_first(struct vnode **mvp, struct mount *mp);
  185 void          __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp);
  186 
  187 #define MNT_VNODE_FOREACH(vp, mp, mvp) \
  188         for (vp = __mnt_vnode_first(&(mvp), (mp)); \
  189                 (vp) != NULL; vp = __mnt_vnode_next(&(mvp), (mp)))
  190 
  191 #define MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp)                        \
  192         __mnt_vnode_markerfree(&(mvp), (mp)) 
  193 
  194 #define MNT_VNODE_FOREACH_ABORT(mp, mvp)                                \
  195         do {                                                            \
  196           MNT_ILOCK(mp);                                                \
  197           MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp);                     \
  198           MNT_IUNLOCK(mp);                                              \
  199         } while (0)
  200 
  201 #define MNT_ILOCK(mp)   mtx_lock(&(mp)->mnt_mtx)
  202 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
  203 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
  204 #define MNT_MTX(mp)     (&(mp)->mnt_mtx)
  205 #define MNT_REF(mp)     (mp)->mnt_ref++
  206 #define MNT_REL(mp)     do {                                            \
  207         (mp)->mnt_ref--;                                                \
  208         if ((mp)->mnt_ref == 0)                                         \
  209                 wakeup((mp));                                           \
  210 } while (0)
  211 
  212 #endif /* _KERNEL */
  213 
  214 /*
  215  * User specifiable flags.
  216  */
  217 #define MNT_RDONLY      0x00000001      /* read only filesystem */
  218 #define MNT_SYNCHRONOUS 0x00000002      /* filesystem written synchronously */
  219 #define MNT_NOEXEC      0x00000004      /* can't exec from filesystem */
  220 #define MNT_NOSUID      0x00000008      /* don't honor setuid bits on fs */
  221 #define MNT_NODEV       0               /* Deprecated option */
  222 #define MNT_UNION       0x00000020      /* union with underlying filesystem */
  223 #define MNT_ASYNC       0x00000040      /* filesystem written asynchronously */
  224 #define MNT_SUIDDIR     0x00100000      /* special handling of SUID on dirs */
  225 #define MNT_SOFTDEP     0x00200000      /* soft updates being done */
  226 #define MNT_NOSYMFOLLOW 0x00400000      /* do not follow symlinks */
  227 #define MNT_JAILDEVFS   0x02000000      /* jail-friendly DEVFS behaviour */
  228 #define MNT_MULTILABEL  0x04000000      /* MAC support for individual objects */
  229 #define MNT_ACLS        0x08000000      /* ACL support enabled */
  230 #define MNT_NOATIME     0x10000000      /* disable update of file access time */
  231 #define MNT_NOCLUSTERR  0x40000000      /* disable cluster read */
  232 #define MNT_NOCLUSTERW  0x80000000      /* disable cluster write */
  233 
  234 /*
  235  * NFS export related mount flags.
  236  */
  237 #define MNT_EXRDONLY    0x00000080      /* exported read only */
  238 #define MNT_EXPORTED    0x00000100      /* filesystem is exported */
  239 #define MNT_DEFEXPORTED 0x00000200      /* exported to the world */
  240 #define MNT_EXPORTANON  0x00000400      /* use anon uid mapping for everyone */
  241 #define MNT_EXKERB      0x00000800      /* exported with Kerberos uid mapping */
  242 #define MNT_EXPUBLIC    0x20000000      /* public export (WebNFS) */
  243 
  244 /*
  245  * Flags set by internal operations,
  246  * but visible to the user.
  247  * XXX some of these are not quite right.. (I've never seen the root flag set)
  248  */
  249 #define MNT_LOCAL       0x00001000      /* filesystem is stored locally */
  250 #define MNT_QUOTA       0x00002000      /* quotas are enabled on filesystem */
  251 #define MNT_ROOTFS      0x00004000      /* identifies the root filesystem */
  252 #define MNT_USER        0x00008000      /* mounted by a user */
  253 #define MNT_IGNORE      0x00800000      /* do not show entry in df */
  254 
  255 /*
  256  * Mask of flags that are visible to statfs().
  257  * XXX I think that this could now become (~(MNT_CMDFLAGS))
  258  * but the 'mount' program may need changing to handle this.
  259  */
  260 #define MNT_VISFLAGMASK (MNT_RDONLY     | MNT_SYNCHRONOUS | MNT_NOEXEC  | \
  261                         MNT_NOSUID      | MNT_UNION     | \
  262                         MNT_ASYNC       | MNT_EXRDONLY  | MNT_EXPORTED  | \
  263                         MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB    | \
  264                         MNT_LOCAL       | MNT_USER      | MNT_QUOTA     | \
  265                         MNT_ROOTFS      | MNT_NOATIME   | MNT_NOCLUSTERR| \
  266                         MNT_NOCLUSTERW  | MNT_SUIDDIR   | MNT_SOFTDEP   | \
  267                         MNT_IGNORE      | MNT_EXPUBLIC  | MNT_NOSYMFOLLOW | \
  268                         MNT_JAILDEVFS   | MNT_MULTILABEL | MNT_ACLS)
  269 
  270 /* Mask of flags that can be updated. */
  271 #define MNT_UPDATEMASK (MNT_NOSUID      | MNT_NOEXEC    | \
  272                         MNT_SYNCHRONOUS | MNT_UNION     | MNT_ASYNC     | \
  273                         MNT_NOATIME | \
  274                         MNT_NOSYMFOLLOW | MNT_IGNORE    | MNT_JAILDEVFS | \
  275                         MNT_NOCLUSTERR  | MNT_NOCLUSTERW | MNT_SUIDDIR  | \
  276                         MNT_ACLS        | MNT_USER)
  277 
  278 /*
  279  * External filesystem command modifier flags.
  280  * Unmount can use the MNT_FORCE flag.
  281  * XXX These are not STATES and really should be somewhere else.
  282  */
  283 #define MNT_UPDATE      0x00010000      /* not a real mount, just an update */
  284 #define MNT_DELEXPORT   0x00020000      /* delete export host lists */
  285 #define MNT_RELOAD      0x00040000      /* reload filesystem data */
  286 #define MNT_FORCE       0x00080000      /* force unmount or readonly change */
  287 #define MNT_SNAPSHOT    0x01000000      /* snapshot the filesystem */
  288 #define MNT_BYFSID      0x08000000      /* specify filesystem by ID. */
  289 #define MNT_CMDFLAGS   (MNT_UPDATE      | MNT_DELEXPORT | MNT_RELOAD    | \
  290                         MNT_FORCE       | MNT_SNAPSHOT  | MNT_BYFSID)
  291 /*
  292  * Internal filesystem control flags stored in mnt_kern_flag.
  293  *
  294  * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
  295  * past the mount point.  This keeps the subtree stable during mounts
  296  * and unmounts.
  297  *
  298  * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
  299  * dounmount() is still waiting to lock the mountpoint. This allows
  300  * the filesystem to cancel operations that might otherwise deadlock
  301  * with the unmount attempt (used by NFS).
  302  */
  303 #define MNTK_UNMOUNTF   0x00000001      /* forced unmount in progress */
  304 #define MNTK_UNMOUNT    0x01000000      /* unmount in progress */
  305 #define MNTK_MWAIT      0x02000000      /* waiting for unmount to finish */
  306 #define MNTK_SUSPEND    0x08000000      /* request write suspension */
  307 #define MNTK_SUSPEND2   0x04000000      /* block secondary writes */
  308 #define MNTK_SUSPENDED  0x10000000      /* write operations are suspended */
  309 #define MNTK_MPSAFE     0x20000000      /* Filesystem is MPSAFE. */
  310 #define MNTK_NOKNOTE    0x80000000      /* Don't send KNOTEs from VOP hooks */
  311 #define MNTK_LOOKUP_SHARED      0x40000000 /* FS supports shared lock lookups */
  312 
  313 /*
  314  * Sysctl CTL_VFS definitions.
  315  *
  316  * Second level identifier specifies which filesystem. Second level
  317  * identifier VFS_VFSCONF returns information about all filesystems.
  318  * Second level identifier VFS_GENERIC is non-terminal.
  319  */
  320 #define VFS_VFSCONF             0       /* get configured filesystems */
  321 #define VFS_GENERIC             0       /* generic filesystem information */
  322 /*
  323  * Third level identifiers for VFS_GENERIC are given below; third
  324  * level identifiers for specific filesystems are given in their
  325  * mount specific header files.
  326  */
  327 #define VFS_MAXTYPENUM  1       /* int: highest defined filesystem type */
  328 #define VFS_CONF        2       /* struct: vfsconf for filesystem given
  329                                    as next argument */
  330 
  331 /*
  332  * Flags for various system call interfaces.
  333  *
  334  * waitfor flags to vfs_sync() and getfsstat()
  335  */
  336 #define MNT_WAIT        1       /* synchronously wait for I/O to complete */
  337 #define MNT_NOWAIT      2       /* start all I/O, but do not wait for it */
  338 #define MNT_LAZY        3       /* push data not written by filesystem syncer */
  339 #define MNT_SUSPEND     4       /* Suspend file system after sync */
  340 
  341 /*
  342  * Generic file handle
  343  */
  344 struct fhandle {
  345         fsid_t  fh_fsid;        /* Filesystem id of mount point */
  346         struct  fid fh_fid;     /* Filesys specific id */
  347 };
  348 typedef struct fhandle  fhandle_t;
  349 
  350 /*
  351  * Export arguments for local filesystem mount calls.
  352  */
  353 struct export_args {
  354         int     ex_flags;               /* export related flags */
  355         uid_t   ex_root;                /* mapping for root uid */
  356         struct  xucred ex_anon;         /* mapping for anonymous user */
  357         struct  sockaddr *ex_addr;      /* net address to which exported */
  358         u_char  ex_addrlen;             /* and the net address length */
  359         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  360         u_char  ex_masklen;             /* and the smask length */
  361         char    *ex_indexfile;          /* index file for WebNFS URLs */
  362 };
  363 
  364 /*
  365  * Structure holding information for a publicly exported filesystem
  366  * (WebNFS). Currently the specs allow just for one such filesystem.
  367  */
  368 struct nfs_public {
  369         int             np_valid;       /* Do we hold valid information */
  370         fhandle_t       np_handle;      /* Filehandle for pub fs (internal) */
  371         struct mount    *np_mount;      /* Mountpoint of exported fs */
  372         char            *np_index;      /* Index file */
  373 };
  374 
  375 /*
  376  * Filesystem configuration information. One of these exists for each
  377  * type of filesystem supported by the kernel. These are searched at
  378  * mount time to identify the requested filesystem.
  379  *
  380  * XXX: Never change the first two arguments!
  381  */
  382 struct vfsconf {
  383         u_int   vfc_version;            /* ABI version number */
  384         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  385         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  386         int     vfc_typenum;            /* historic filesystem type number */
  387         int     vfc_refcount;           /* number mounted of this type */
  388         int     vfc_flags;              /* permanent flags */
  389         struct  vfsoptdecl *vfc_opts;   /* mount options */
  390         TAILQ_ENTRY(vfsconf) vfc_list;  /* list of vfscons */
  391 };
  392 
  393 /* Userland version of the struct vfsconf. */
  394 struct xvfsconf {
  395         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  396         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  397         int     vfc_typenum;            /* historic filesystem type number */
  398         int     vfc_refcount;           /* number mounted of this type */
  399         int     vfc_flags;              /* permanent flags */
  400         struct  vfsconf *vfc_next;      /* next in list */
  401 };
  402 
  403 #ifndef BURN_BRIDGES
  404 struct ovfsconf {
  405         void    *vfc_vfsops;
  406         char    vfc_name[32];
  407         int     vfc_index;
  408         int     vfc_refcount;
  409         int     vfc_flags;
  410 };
  411 #endif
  412 
  413 /*
  414  * NB: these flags refer to IMPLEMENTATION properties, not properties of
  415  * any actual mounts; i.e., it does not make sense to change the flags.
  416  */
  417 #define VFCF_STATIC     0x00010000      /* statically compiled into kernel */
  418 #define VFCF_NETWORK    0x00020000      /* may get data over the network */
  419 #define VFCF_READONLY   0x00040000      /* writes are not implemented */
  420 #define VFCF_SYNTHETIC  0x00080000      /* data does not represent real files */
  421 #define VFCF_LOOPBACK   0x00100000      /* aliases some other mounted FS */
  422 #define VFCF_UNICODE    0x00200000      /* stores file names as Unicode*/
  423 
  424 typedef uint32_t fsctlop_t;
  425 
  426 struct vfsidctl {
  427         int             vc_vers;        /* should be VFSIDCTL_VERS1 (below) */
  428         fsid_t          vc_fsid;        /* fsid to operate on. */
  429         char            vc_fstypename[MFSNAMELEN];
  430                                         /* type of fs 'nfs' or '*' */
  431         fsctlop_t       vc_op;          /* operation VFS_CTL_* (below) */
  432         void            *vc_ptr;        /* pointer to data structure. */
  433         size_t          vc_len;         /* sizeof said structure. */
  434         u_int32_t       vc_spare[12];   /* spare (must be zero). */
  435 };
  436 
  437 /* vfsidctl API version. */
  438 #define VFS_CTL_VERS1   0x01
  439 
  440 /*
  441  * New style VFS sysctls, do not reuse/conflict with the namespace for
  442  * private sysctls.
  443  * All "global" sysctl ops have the 33rd bit set:
  444  * 0x...1....
  445  * Private sysctl ops should have the 33rd bit unset.
  446  */
  447 #define VFS_CTL_QUERY   0x00010001      /* anything wrong? (vfsquery) */
  448 #define VFS_CTL_TIMEO   0x00010002      /* set timeout for vfs notification */
  449 #define VFS_CTL_NOLOCKS 0x00010003      /* disable file locking */
  450 
  451 struct vfsquery {
  452         u_int32_t       vq_flags;
  453         u_int32_t       vq_spare[31];
  454 };
  455 
  456 /* vfsquery flags */
  457 #define VQ_NOTRESP      0x0001  /* server down */
  458 #define VQ_NEEDAUTH     0x0002  /* server bad auth */
  459 #define VQ_LOWDISK      0x0004  /* we're low on space */
  460 #define VQ_MOUNT        0x0008  /* new filesystem arrived */
  461 #define VQ_UNMOUNT      0x0010  /* filesystem has left */
  462 #define VQ_DEAD         0x0020  /* filesystem is dead, needs force unmount */
  463 #define VQ_ASSIST       0x0040  /* filesystem needs assistance from external
  464                                    program */
  465 #define VQ_NOTRESPLOCK  0x0080  /* server lockd down */
  466 #define VQ_FLAG0100     0x0100  /* placeholder */
  467 #define VQ_FLAG0200     0x0200  /* placeholder */
  468 #define VQ_FLAG0400     0x0400  /* placeholder */
  469 #define VQ_FLAG0800     0x0800  /* placeholder */
  470 #define VQ_FLAG1000     0x1000  /* placeholder */
  471 #define VQ_FLAG2000     0x2000  /* placeholder */
  472 #define VQ_FLAG4000     0x4000  /* placeholder */
  473 #define VQ_FLAG8000     0x8000  /* placeholder */
  474 
  475 #ifdef _KERNEL
  476 /* Point a sysctl request at a vfsidctl's data. */
  477 #define VCTLTOREQ(vc, req)                                              \
  478         do {                                                            \
  479                 (req)->newptr = (vc)->vc_ptr;                           \
  480                 (req)->newlen = (vc)->vc_len;                           \
  481                 (req)->newidx = 0;                                      \
  482         } while (0)
  483 #endif
  484 
  485 struct iovec;
  486 struct uio;
  487 
  488 #ifdef _KERNEL
  489 
  490 #ifdef MALLOC_DECLARE
  491 MALLOC_DECLARE(M_MOUNT);
  492 #endif
  493 extern int maxvfsconf;          /* highest defined filesystem type */
  494 extern int nfs_mount_type;      /* vfc_typenum for nfs, or -1 */
  495 
  496 TAILQ_HEAD(vfsconfhead, vfsconf);
  497 extern struct vfsconfhead vfsconf;
  498 
  499 /*
  500  * Operations supported on mounted filesystem.
  501  */
  502 struct mount_args;
  503 struct nameidata;
  504 struct sysctl_req;
  505 struct mntarg;
  506 
  507 typedef int vfs_cmount_t(struct mntarg *ma, void *data, int flags, struct thread *td);
  508 typedef int vfs_unmount_t(struct mount *mp, int mntflags, struct thread *td);
  509 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp,
  510                     struct thread *td);
  511 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid,
  512                     caddr_t arg, struct thread *td);
  513 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp,
  514                     struct thread *td);
  515 typedef int vfs_sync_t(struct mount *mp, int waitfor, struct thread *td);
  516 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
  517                     struct vnode **vpp);
  518 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp);
  519 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
  520                     int *extflagsp, struct ucred **credanonp);
  521 typedef int vfs_vptofh_t(struct vnode *vp, struct fid *fhp);
  522 typedef int vfs_init_t(struct vfsconf *);
  523 typedef int vfs_uninit_t(struct vfsconf *);
  524 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
  525                     struct vnode *filename_vp, int attrnamespace,
  526                     const char *attrname, struct thread *td);
  527 typedef int vfs_mount_t(struct mount *mp, struct thread *td);
  528 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
  529                     struct sysctl_req *req);
  530 
  531 struct vfsops {
  532         vfs_mount_t             *vfs_mount;
  533         vfs_cmount_t            *vfs_cmount;
  534         vfs_unmount_t           *vfs_unmount;
  535         vfs_root_t              *vfs_root;
  536         vfs_quotactl_t          *vfs_quotactl;
  537         vfs_statfs_t            *vfs_statfs;
  538         vfs_sync_t              *vfs_sync;
  539         vfs_vget_t              *vfs_vget;
  540         vfs_fhtovp_t            *vfs_fhtovp;
  541         vfs_checkexp_t          *vfs_checkexp;
  542         vfs_vptofh_t            *vfs_vptofh;
  543         vfs_init_t              *vfs_init;
  544         vfs_uninit_t            *vfs_uninit;
  545         vfs_extattrctl_t        *vfs_extattrctl;
  546         vfs_sysctl_t            *vfs_sysctl;
  547 };
  548 
  549 vfs_statfs_t    __vfs_statfs;
  550 
  551 #define VFS_MOUNT(MP, P)    (*(MP)->mnt_op->vfs_mount)(MP, P)
  552 #define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P)
  553 #define VFS_ROOT(MP, FLAGS, VPP, P) \
  554         (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP, P)
  555 #define VFS_QUOTACTL(MP,C,U,A,P)  (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P)
  556 #define VFS_STATFS(MP, SBP, P)    __vfs_statfs((MP), (SBP), (P))
  557 #define VFS_SYNC(MP, WAIT, P)  (*(MP)->mnt_op->vfs_sync)(MP, WAIT, P)
  558 #define VFS_VGET(MP, INO, FLAGS, VPP) \
  559         (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP)
  560 #define VFS_FHTOVP(MP, FIDP, VPP) \
  561         (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP)
  562 #define VFS_VPTOFH(VP, FIDP)      (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP)
  563 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \
  564         (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED)
  565 #define VFS_EXTATTRCTL(MP, C, FN, NS, N, P) \
  566         (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N, P)
  567 #define VFS_SYSCTL(MP, OP, REQ) \
  568         (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ)
  569 
  570 extern int mpsafe_vfs;
  571 
  572 #define VFS_NEEDSGIANT_(MP)                                             \
  573     (!mpsafe_vfs || ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0))
  574 
  575 #define VFS_NEEDSGIANT(MP) __extension__                                \
  576 ({                                                                      \
  577         struct mount *_mp;                                              \
  578         _mp = (MP);                                                     \
  579         VFS_NEEDSGIANT_(_mp);                                           \
  580 })
  581 
  582 #define VFS_LOCK_GIANT(MP) __extension__                                \
  583 ({                                                                      \
  584         int _locked;                                                    \
  585         struct mount *_mp;                                              \
  586         _mp = (MP);                                                     \
  587         if (VFS_NEEDSGIANT_(_mp)) {                                     \
  588                 mtx_lock(&Giant);                                       \
  589                 _locked = 1;                                            \
  590         } else                                                          \
  591                 _locked = 0;                                            \
  592         _locked;                                                        \
  593 })
  594 #define VFS_UNLOCK_GIANT(locked)        if ((locked)) mtx_unlock(&Giant);
  595 #define VFS_ASSERT_GIANT(MP) do                                         \
  596 {                                                                       \
  597         struct mount *_mp;                                              \
  598         _mp = (MP);                                                     \
  599         if (VFS_NEEDSGIANT_(_mp))                                       \
  600                 mtx_assert(&Giant, MA_OWNED);                           \
  601 } while (0)
  602 
  603 #define VFS_KNOTE_LOCKED(vp, hint) do                                   \
  604 {                                                                       \
  605         if (((vp)->v_vflag & VV_NOKNOTE) == 0)                          \
  606                 VN_KNOTE((vp), (hint), 1);                              \
  607 } while (0)
  608 
  609 #define VFS_KNOTE_UNLOCKED(vp, hint) do                                 \
  610 {                                                                       \
  611         if (((vp)->v_vflag & VV_NOKNOTE) == 0)                          \
  612                 VN_KNOTE((vp), (hint), 0);                              \
  613 } while (0)
  614 
  615 #include <sys/module.h>
  616 
  617 /*
  618  * Version numbers.
  619  */
  620 #define VFS_VERSION_00  0x19660120
  621 #define VFS_VERSION     VFS_VERSION_00
  622 
  623 #define VFS_SET(vfsops, fsname, flags) \
  624         static struct vfsconf fsname ## _vfsconf = {            \
  625                 .vfc_version = VFS_VERSION,                     \
  626                 .vfc_name = #fsname,                            \
  627                 .vfc_vfsops = &vfsops,                          \
  628                 .vfc_typenum = -1,                              \
  629                 .vfc_flags = flags,                             \
  630         };                                                      \
  631         static moduledata_t fsname ## _mod = {                  \
  632                 #fsname,                                        \
  633                 vfs_modevent,                                   \
  634                 & fsname ## _vfsconf                            \
  635         };                                                      \
  636         DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
  637 
  638 extern  char *mountrootfsname;
  639 
  640 /*
  641  * exported vnode operations
  642  */
  643 
  644 int     dounmount(struct mount *, int, struct thread *);
  645 
  646 int     kernel_mount(struct mntarg *ma, int flags);
  647 int     kernel_vmount(int flags, ...);
  648 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
  649 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
  650 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
  651 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
  652 struct vfsconf *vfs_byname(const char *);
  653 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
  654 void    vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
  655 void    vfs_deleteopt(struct vfsoptlist *opts, const char *name);
  656 int     vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val);
  657 int     vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
  658 char    *vfs_getopts(struct vfsoptlist *, const char *, int *error);
  659 int     vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
  660 int     vfs_filteropt(struct vfsoptlist *, const char **legal);
  661 int     vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
  662 int     vfs_setpublicfs                     /* set publicly exported fs */
  663             (struct mount *, struct netexport *, struct export_args *);
  664 void    vfs_msync(struct mount *, int);
  665 int     vfs_busy(struct mount *, int, struct mtx *, struct thread *);
  666 int     vfs_export                       /* process mount export info */
  667             (struct mount *, struct export_args *);
  668 int     vfs_allocate_syncvnode(struct mount *);
  669 void    vfs_getnewfsid(struct mount *);
  670 struct cdev *vfs_getrootfsid(struct mount *);
  671 struct  mount *vfs_getvfs(fsid_t *);      /* return vfs given fsid */
  672 int     vfs_modevent(module_t, int, void *);
  673 void    vfs_mount_error(struct mount *, const char *, ...);
  674 void    vfs_mountroot(void);                    /* mount our root filesystem */
  675 void    vfs_mountedfrom(struct mount *, const char *from);
  676 void    vfs_ref(struct mount *);
  677 void    vfs_rel(struct mount *);
  678 int     vfs_suser(struct mount *, struct thread *);
  679 void    vfs_unbusy(struct mount *, struct thread *);
  680 void    vfs_unmountall(void);
  681 extern  TAILQ_HEAD(mntlist, mount) mountlist;   /* mounted filesystem list */
  682 extern  struct mtx mountlist_mtx;
  683 extern  struct nfs_public nfs_pub;
  684 
  685 /*
  686  * Declarations for these vfs default operations are located in
  687  * kern/vfs_default.c, they should be used instead of making "dummy"
  688  * functions or casting entries in the VFS op table to "enopnotsupp()".
  689  */
  690 vfs_root_t              vfs_stdroot;
  691 vfs_quotactl_t          vfs_stdquotactl;
  692 vfs_statfs_t            vfs_stdstatfs;
  693 vfs_sync_t              vfs_stdsync;
  694 vfs_sync_t              vfs_stdnosync;
  695 vfs_vget_t              vfs_stdvget;
  696 vfs_fhtovp_t            vfs_stdfhtovp;
  697 vfs_checkexp_t          vfs_stdcheckexp;
  698 vfs_vptofh_t            vfs_stdvptofh;
  699 vfs_init_t              vfs_stdinit;
  700 vfs_uninit_t            vfs_stduninit;
  701 vfs_extattrctl_t        vfs_stdextattrctl;
  702 vfs_sysctl_t            vfs_stdsysctl;
  703 
  704 #else /* !_KERNEL */
  705 
  706 #include <sys/cdefs.h>
  707 
  708 struct stat;
  709 
  710 __BEGIN_DECLS
  711 int     fhopen(const struct fhandle *, int);
  712 int     fhstat(const struct fhandle *, struct stat *);
  713 int     fhstatfs(const struct fhandle *, struct statfs *);
  714 int     fstatfs(int, struct statfs *);
  715 int     getfh(const char *, fhandle_t *);
  716 int     getfsstat(struct statfs *, long, int);
  717 int     getmntinfo(struct statfs **, int);
  718 int     lgetfh(const char *, fhandle_t *);
  719 int     mount(const char *, const char *, int, void *);
  720 int     nmount(struct iovec *, unsigned int, int);
  721 int     statfs(const char *, struct statfs *);
  722 int     unmount(const char *, int);
  723 
  724 /* C library stuff */
  725 int     getvfsbyname(const char *, struct xvfsconf *);
  726 __END_DECLS
  727 
  728 #endif /* _KERNEL */
  729 
  730 #endif /* !_SYS_MOUNT_H_ */

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