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/8.2/sys/sys/mount.h 214420 2010-10-27 15:44:49Z kib $
   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/lock.h>
   40 #include <sys/lockmgr.h>
   41 #include <sys/_mutex.h>
   42 #endif
   43 
   44 /*
   45  * NOTE: When changing statfs structure, mount structure, MNT_* flags or
   46  * MNTK_* flags also update DDB show mount command in vfs_subr.c.
   47  */
   48 
   49 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
   50 
   51 /*
   52  * File identifier.
   53  * These are unique per filesystem on a single machine.
   54  */
   55 #define MAXFIDSZ        16
   56 
   57 struct fid {
   58         u_short         fid_len;                /* length of data in bytes */
   59         u_short         fid_data0;              /* force longword alignment */
   60         char            fid_data[MAXFIDSZ];     /* data (variable length) */
   61 };
   62 
   63 /*
   64  * filesystem statistics
   65  */
   66 #define MFSNAMELEN      16              /* length of type name including null */
   67 #define MNAMELEN        88              /* size of on/from name bufs */
   68 #define STATFS_VERSION  0x20030518      /* current version number */
   69 struct statfs {
   70         uint32_t f_version;             /* structure version number */
   71         uint32_t f_type;                /* type of filesystem */
   72         uint64_t f_flags;               /* copy of mount exported flags */
   73         uint64_t f_bsize;               /* filesystem fragment size */
   74         uint64_t f_iosize;              /* optimal transfer block size */
   75         uint64_t f_blocks;              /* total data blocks in filesystem */
   76         uint64_t f_bfree;               /* free blocks in filesystem */
   77         int64_t  f_bavail;              /* free blocks avail to non-superuser */
   78         uint64_t f_files;               /* total file nodes in filesystem */
   79         int64_t  f_ffree;               /* free nodes avail to non-superuser */
   80         uint64_t f_syncwrites;          /* count of sync writes since mount */
   81         uint64_t f_asyncwrites;         /* count of async writes since mount */
   82         uint64_t f_syncreads;           /* count of sync reads since mount */
   83         uint64_t f_asyncreads;          /* count of async reads since mount */
   84         uint64_t f_spare[10];           /* unused spare */
   85         uint32_t f_namemax;             /* maximum filename length */
   86         uid_t     f_owner;              /* user that mounted the filesystem */
   87         fsid_t    f_fsid;               /* filesystem id */
   88         char      f_charspare[80];          /* spare string space */
   89         char      f_fstypename[MFSNAMELEN]; /* filesystem type name */
   90         char      f_mntfromname[MNAMELEN];  /* mounted filesystem */
   91         char      f_mntonname[MNAMELEN];    /* directory on which mounted */
   92 };
   93 
   94 #ifdef _KERNEL
   95 #define OMFSNAMELEN     16      /* length of fs type name, including null */
   96 #define OMNAMELEN       (88 - 2 * sizeof(long)) /* size of on/from name bufs */
   97 
   98 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
   99 /* XXX statfs.2 is out of date with read counter changes here. */
  100 struct ostatfs {
  101         long    f_spare2;               /* placeholder */
  102         long    f_bsize;                /* fundamental filesystem block size */
  103         long    f_iosize;               /* optimal transfer block size */
  104         long    f_blocks;               /* total data blocks in filesystem */
  105         long    f_bfree;                /* free blocks in fs */
  106         long    f_bavail;               /* free blocks avail to non-superuser */
  107         long    f_files;                /* total file nodes in filesystem */
  108         long    f_ffree;                /* free file nodes in fs */
  109         fsid_t  f_fsid;                 /* filesystem id */
  110         uid_t   f_owner;                /* user that mounted the filesystem */
  111         int     f_type;                 /* type of filesystem */
  112         int     f_flags;                /* copy of mount exported flags */
  113         long    f_syncwrites;           /* count of sync writes since mount */
  114         long    f_asyncwrites;          /* count of async writes since mount */
  115         char    f_fstypename[OMFSNAMELEN]; /* fs type name */
  116         char    f_mntonname[OMNAMELEN]; /* directory on which mounted */
  117         long    f_syncreads;            /* count of sync reads since mount */
  118         long    f_asyncreads;           /* count of async reads since mount */
  119         short   f_spares1;              /* unused spare */
  120         char    f_mntfromname[OMNAMELEN];/* mounted filesystem */
  121         short   f_spares2;              /* unused spare */
  122         /*
  123          * XXX on machines where longs are aligned to 8-byte boundaries, there
  124          * is an unnamed int32_t here.  This spare was after the apparent end
  125          * of the struct until we bit off the read counters from f_mntonname.
  126          */
  127         long    f_spare[2];             /* unused spare */
  128 };
  129 
  130 TAILQ_HEAD(vnodelst, vnode);
  131 
  132 /* Mount options list */
  133 TAILQ_HEAD(vfsoptlist, vfsopt);
  134 struct vfsopt {
  135         TAILQ_ENTRY(vfsopt) link;
  136         char    *name;
  137         void    *value;
  138         int     len;
  139         int     pos;
  140         int     seen;
  141 };
  142 
  143 /*
  144  * Structure per mounted filesystem.  Each mounted filesystem has an
  145  * array of operations and an instance record.  The filesystems are
  146  * put on a doubly linked list.
  147  *
  148  * Lock reference:
  149  *      m - mountlist_mtx
  150  *      i - interlock
  151  *
  152  * Unmarked fields are considered stable as long as a ref is held.
  153  *
  154  */
  155 struct mount {
  156         struct mtx      mnt_mtx;                /* mount structure interlock */
  157         int             mnt_gen;                /* struct mount generation */
  158 #define mnt_startzero   mnt_list
  159         TAILQ_ENTRY(mount) mnt_list;            /* (m) mount list */
  160         struct vfsops   *mnt_op;                /* operations on fs */
  161         struct vfsconf  *mnt_vfc;               /* configuration info */
  162         struct vnode    *mnt_vnodecovered;      /* vnode we mounted on */
  163         struct vnode    *mnt_syncer;            /* syncer vnode */
  164         int             mnt_ref;                /* (i) Reference count */
  165         struct vnodelst mnt_nvnodelist;         /* (i) list of vnodes */
  166         int             mnt_nvnodelistsize;     /* (i) # of vnodes */
  167         int             mnt_writeopcount;       /* (i) write syscalls pending */
  168         int             mnt_kern_flag;          /* (i) kernel only flags */
  169         u_int           mnt_flag;               /* (i) flags shared with user */
  170         u_int           mnt_xflag;              /* (i) more flags shared with user */
  171         u_int           mnt_noasync;            /* (i) # noasync overrides */
  172         struct vfsoptlist *mnt_opt;             /* current mount options */
  173         struct vfsoptlist *mnt_optnew;          /* new options passed to fs */
  174         int             mnt_maxsymlinklen;      /* max size of short symlink */
  175         struct statfs   mnt_stat;               /* cache of filesystem stats */
  176         struct ucred    *mnt_cred;              /* credentials of mounter */
  177         void *          mnt_data;               /* private data */
  178         time_t          mnt_time;               /* last time written*/
  179         int             mnt_iosize_max;         /* max size for clusters, etc */
  180         struct netexport *mnt_export;           /* export list */
  181         struct label    *mnt_label;             /* MAC label for the fs */
  182         u_int           mnt_hashseed;           /* Random seed for vfs_hash */
  183         int             mnt_lockref;            /* (i) Lock reference count */
  184         int             mnt_secondary_writes;   /* (i) # of secondary writes */
  185         int             mnt_secondary_accwrites;/* (i) secondary wr. starts */
  186         struct thread   *mnt_susp_owner;        /* (i) thread owning suspension */
  187 #define mnt_endzero     mnt_gjprovider
  188         char            *mnt_gjprovider;        /* gjournal provider name */
  189         struct lock     mnt_explock;            /* vfs_export walkers lock */
  190 };
  191 
  192 struct vnode *__mnt_vnode_next(struct vnode **mvp, struct mount *mp);
  193 struct vnode *__mnt_vnode_first(struct vnode **mvp, struct mount *mp);
  194 void          __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp);
  195 
  196 #define MNT_VNODE_FOREACH(vp, mp, mvp) \
  197         for (vp = __mnt_vnode_first(&(mvp), (mp)); \
  198                 (vp) != NULL; vp = __mnt_vnode_next(&(mvp), (mp)))
  199 
  200 #define MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp)                        \
  201         __mnt_vnode_markerfree(&(mvp), (mp))
  202 
  203 #define MNT_VNODE_FOREACH_ABORT(mp, mvp)                                \
  204         do {                                                            \
  205           MNT_ILOCK(mp);                                                \
  206           MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp);                     \
  207           MNT_IUNLOCK(mp);                                              \
  208         } while (0)
  209 
  210 #define MNT_ILOCK(mp)   mtx_lock(&(mp)->mnt_mtx)
  211 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
  212 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
  213 #define MNT_MTX(mp)     (&(mp)->mnt_mtx)
  214 #define MNT_REF(mp)     (mp)->mnt_ref++
  215 #define MNT_REL(mp)     do {                                            \
  216         KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref"));                       \
  217         (mp)->mnt_ref--;                                                \
  218         if ((mp)->mnt_ref == 0)                                         \
  219                 wakeup((mp));                                           \
  220 } while (0)
  221 
  222 #endif /* _KERNEL */
  223 
  224 /*
  225  * User specifiable flags, stored in mnt_flag.
  226  */
  227 #define MNT_RDONLY      0x00000001      /* read only filesystem */
  228 #define MNT_SYNCHRONOUS 0x00000002      /* filesystem written synchronously */
  229 #define MNT_NOEXEC      0x00000004      /* can't exec from filesystem */
  230 #define MNT_NOSUID      0x00000008      /* don't honor setuid bits on fs */
  231 #define MNT_UNION       0x00000020      /* union with underlying filesystem */
  232 #define MNT_ASYNC       0x00000040      /* filesystem written asynchronously */
  233 #define MNT_SUIDDIR     0x00100000      /* special handling of SUID on dirs */
  234 #define MNT_SOFTDEP     0x00200000      /* soft updates being done */
  235 #define MNT_NOSYMFOLLOW 0x00400000      /* do not follow symlinks */
  236 #define MNT_GJOURNAL    0x02000000      /* GEOM journal support enabled */
  237 #define MNT_MULTILABEL  0x04000000      /* MAC support for individual objects */
  238 #define MNT_ACLS        0x08000000      /* ACL support enabled */
  239 #define MNT_NOATIME     0x10000000      /* disable update of file access time */
  240 #define MNT_NOCLUSTERR  0x40000000      /* disable cluster read */
  241 #define MNT_NOCLUSTERW  0x80000000      /* disable cluster write */
  242 #define MNT_NFS4ACLS    0x00000010
  243 
  244 /*
  245  * NFS export related mount flags.
  246  */
  247 #define MNT_EXRDONLY    0x00000080      /* exported read only */
  248 #define MNT_EXPORTED    0x00000100      /* filesystem is exported */
  249 #define MNT_DEFEXPORTED 0x00000200      /* exported to the world */
  250 #define MNT_EXPORTANON  0x00000400      /* use anon uid mapping for everyone */
  251 #define MNT_EXKERB      0x00000800      /* exported with Kerberos uid mapping */
  252 #define MNT_EXPUBLIC    0x20000000      /* public export (WebNFS) */
  253 
  254 /*
  255  * Flags set by internal operations,
  256  * but visible to the user.
  257  * XXX some of these are not quite right.. (I've never seen the root flag set)
  258  */
  259 #define MNT_LOCAL       0x00001000      /* filesystem is stored locally */
  260 #define MNT_QUOTA       0x00002000      /* quotas are enabled on filesystem */
  261 #define MNT_ROOTFS      0x00004000      /* identifies the root filesystem */
  262 #define MNT_USER        0x00008000      /* mounted by a user */
  263 #define MNT_IGNORE      0x00800000      /* do not show entry in df */
  264 
  265 /*
  266  * Mask of flags that are visible to statfs().
  267  * XXX I think that this could now become (~(MNT_CMDFLAGS))
  268  * but the 'mount' program may need changing to handle this.
  269  */
  270 #define MNT_VISFLAGMASK (MNT_RDONLY     | MNT_SYNCHRONOUS | MNT_NOEXEC  | \
  271                         MNT_NOSUID      | MNT_UNION     | \
  272                         MNT_ASYNC       | MNT_EXRDONLY  | MNT_EXPORTED  | \
  273                         MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB    | \
  274                         MNT_LOCAL       | MNT_USER      | MNT_QUOTA     | \
  275                         MNT_ROOTFS      | MNT_NOATIME   | MNT_NOCLUSTERR| \
  276                         MNT_NOCLUSTERW  | MNT_SUIDDIR   | MNT_SOFTDEP   | \
  277                         MNT_IGNORE      | MNT_EXPUBLIC  | MNT_NOSYMFOLLOW | \
  278                         MNT_GJOURNAL    | MNT_MULTILABEL | MNT_ACLS | MNT_NFS4ACLS)
  279 
  280 /* Mask of flags that can be updated. */
  281 #define MNT_UPDATEMASK (MNT_NOSUID      | MNT_NOEXEC    | \
  282                         MNT_SYNCHRONOUS | MNT_UNION     | MNT_ASYNC     | \
  283                         MNT_NOATIME | \
  284                         MNT_NOSYMFOLLOW | MNT_IGNORE    | \
  285                         MNT_NOCLUSTERR  | MNT_NOCLUSTERW | MNT_SUIDDIR  | \
  286                         MNT_ACLS        | MNT_USER | MNT_NFS4ACLS)
  287 
  288 /*
  289  * External filesystem command modifier flags.
  290  * Unmount can use the MNT_FORCE flag.
  291  * XXX: These are not STATES and really should be somewhere else.
  292  * XXX: MNT_BYFSID collides with MNT_ACLS, but because MNT_ACLS is only used for
  293  *      mount(2) and MNT_BYFSID is only used for unmount(2) it's harmless.
  294  */
  295 #define MNT_UPDATE      0x00010000      /* not a real mount, just an update */
  296 #define MNT_DELEXPORT   0x00020000      /* delete export host lists */
  297 #define MNT_RELOAD      0x00040000      /* reload filesystem data */
  298 #define MNT_FORCE       0x00080000      /* force unmount or readonly change */
  299 #define MNT_SNAPSHOT    0x01000000      /* snapshot the filesystem */
  300 #define MNT_BYFSID      0x08000000      /* specify filesystem by ID. */
  301 #define MNT_CMDFLAGS   (MNT_UPDATE      | MNT_DELEXPORT | MNT_RELOAD    | \
  302                         MNT_FORCE       | MNT_SNAPSHOT  | MNT_BYFSID)
  303 /*
  304  * Internal filesystem control flags stored in mnt_kern_flag.
  305  *
  306  * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
  307  * past the mount point.  This keeps the subtree stable during mounts
  308  * and unmounts.
  309  *
  310  * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
  311  * dounmount() is still waiting to lock the mountpoint. This allows
  312  * the filesystem to cancel operations that might otherwise deadlock
  313  * with the unmount attempt (used by NFS).
  314  *
  315  * MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated
  316  * to allow for failed unmount attempt to restore the syncer vnode for
  317  * the mount.
  318  */
  319 #define MNTK_UNMOUNTF   0x00000001      /* forced unmount in progress */
  320 #define MNTK_ASYNC      0x00000002      /* filtered async flag */
  321 #define MNTK_SOFTDEP    0x00000004      /* async disabled by softdep */
  322 #define MNTK_NOINSMNTQ  0x00000008      /* insmntque is not allowed */
  323 #define MNTK_DRAINING   0x00000010      /* lock draining is happening */
  324 #define MNTK_REFEXPIRE  0x00000020      /* refcount expiring is happening */
  325 #define MNTK_EXTENDED_SHARED    0x00000040 /* Allow shared locking for more ops */
  326 #define MNTK_SHARED_WRITES      0x00000080 /* Allow shared locking for writes */
  327 #define MNTK_UNMOUNT    0x01000000      /* unmount in progress */
  328 #define MNTK_MWAIT      0x02000000      /* waiting for unmount to finish */
  329 #define MNTK_SUSPEND    0x08000000      /* request write suspension */
  330 #define MNTK_SUSPEND2   0x04000000      /* block secondary writes */
  331 #define MNTK_SUSPENDED  0x10000000      /* write operations are suspended */
  332 #define MNTK_MPSAFE     0x20000000      /* Filesystem is MPSAFE. */
  333 #define MNTK_LOOKUP_SHARED      0x40000000 /* FS supports shared lock lookups */
  334 #define MNTK_NOKNOTE    0x80000000      /* Don't send KNOTEs from VOP hooks */
  335 
  336 #define MNT_SHARED_WRITES(mp) (((mp) != NULL) &&        \
  337                                 ((mp)->mnt_kern_flag & MNTK_SHARED_WRITES))
  338 
  339 /*
  340  * Sysctl CTL_VFS definitions.
  341  *
  342  * Second level identifier specifies which filesystem. Second level
  343  * identifier VFS_VFSCONF returns information about all filesystems.
  344  * Second level identifier VFS_GENERIC is non-terminal.
  345  */
  346 #define VFS_VFSCONF             0       /* get configured filesystems */
  347 #define VFS_GENERIC             0       /* generic filesystem information */
  348 /*
  349  * Third level identifiers for VFS_GENERIC are given below; third
  350  * level identifiers for specific filesystems are given in their
  351  * mount specific header files.
  352  */
  353 #define VFS_MAXTYPENUM  1       /* int: highest defined filesystem type */
  354 #define VFS_CONF        2       /* struct: vfsconf for filesystem given
  355                                    as next argument */
  356 
  357 /*
  358  * Flags for various system call interfaces.
  359  *
  360  * waitfor flags to vfs_sync() and getfsstat()
  361  */
  362 #define MNT_WAIT        1       /* synchronously wait for I/O to complete */
  363 #define MNT_NOWAIT      2       /* start all I/O, but do not wait for it */
  364 #define MNT_LAZY        3       /* push data not written by filesystem syncer */
  365 #define MNT_SUSPEND     4       /* Suspend file system after sync */
  366 
  367 /*
  368  * Generic file handle
  369  */
  370 struct fhandle {
  371         fsid_t  fh_fsid;        /* Filesystem id of mount point */
  372         struct  fid fh_fid;     /* Filesys specific id */
  373 };
  374 typedef struct fhandle  fhandle_t;
  375 
  376 /*
  377  * Old export arguments without security flavor list
  378  */
  379 struct oexport_args {
  380         int     ex_flags;               /* export related flags */
  381         uid_t   ex_root;                /* mapping for root uid */
  382         struct  xucred ex_anon;         /* mapping for anonymous user */
  383         struct  sockaddr *ex_addr;      /* net address to which exported */
  384         u_char  ex_addrlen;             /* and the net address length */
  385         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  386         u_char  ex_masklen;             /* and the smask length */
  387         char    *ex_indexfile;          /* index file for WebNFS URLs */
  388 };
  389 
  390 /*
  391  * Export arguments for local filesystem mount calls.
  392  */
  393 #define MAXSECFLAVORS   5
  394 struct export_args {
  395         int     ex_flags;               /* export related flags */
  396         uid_t   ex_root;                /* mapping for root uid */
  397         struct  xucred ex_anon;         /* mapping for anonymous user */
  398         struct  sockaddr *ex_addr;      /* net address to which exported */
  399         u_char  ex_addrlen;             /* and the net address length */
  400         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  401         u_char  ex_masklen;             /* and the smask length */
  402         char    *ex_indexfile;          /* index file for WebNFS URLs */
  403         int     ex_numsecflavors;       /* security flavor count */
  404         int     ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
  405 };
  406 
  407 /*
  408  * Structure holding information for a publicly exported filesystem
  409  * (WebNFS). Currently the specs allow just for one such filesystem.
  410  */
  411 struct nfs_public {
  412         int             np_valid;       /* Do we hold valid information */
  413         fhandle_t       np_handle;      /* Filehandle for pub fs (internal) */
  414         struct mount    *np_mount;      /* Mountpoint of exported fs */
  415         char            *np_index;      /* Index file */
  416 };
  417 
  418 /*
  419  * Filesystem configuration information. One of these exists for each
  420  * type of filesystem supported by the kernel. These are searched at
  421  * mount time to identify the requested filesystem.
  422  *
  423  * XXX: Never change the first two arguments!
  424  */
  425 struct vfsconf {
  426         u_int   vfc_version;            /* ABI version number */
  427         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  428         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  429         int     vfc_typenum;            /* historic filesystem type number */
  430         int     vfc_refcount;           /* number mounted of this type */
  431         int     vfc_flags;              /* permanent flags */
  432         struct  vfsoptdecl *vfc_opts;   /* mount options */
  433         TAILQ_ENTRY(vfsconf) vfc_list;  /* list of vfscons */
  434 };
  435 
  436 /* Userland version of the struct vfsconf. */
  437 struct xvfsconf {
  438         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  439         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  440         int     vfc_typenum;            /* historic filesystem type number */
  441         int     vfc_refcount;           /* number mounted of this type */
  442         int     vfc_flags;              /* permanent flags */
  443         struct  vfsconf *vfc_next;      /* next in list */
  444 };
  445 
  446 #ifndef BURN_BRIDGES
  447 struct ovfsconf {
  448         void    *vfc_vfsops;
  449         char    vfc_name[32];
  450         int     vfc_index;
  451         int     vfc_refcount;
  452         int     vfc_flags;
  453 };
  454 #endif
  455 
  456 /*
  457  * NB: these flags refer to IMPLEMENTATION properties, not properties of
  458  * any actual mounts; i.e., it does not make sense to change the flags.
  459  */
  460 #define VFCF_STATIC     0x00010000      /* statically compiled into kernel */
  461 #define VFCF_NETWORK    0x00020000      /* may get data over the network */
  462 #define VFCF_READONLY   0x00040000      /* writes are not implemented */
  463 #define VFCF_SYNTHETIC  0x00080000      /* data does not represent real files */
  464 #define VFCF_LOOPBACK   0x00100000      /* aliases some other mounted FS */
  465 #define VFCF_UNICODE    0x00200000      /* stores file names as Unicode */
  466 #define VFCF_JAIL       0x00400000      /* can be mounted from within a jail */
  467 #define VFCF_DELEGADMIN 0x00800000      /* supports delegated administration */
  468 
  469 typedef uint32_t fsctlop_t;
  470 
  471 struct vfsidctl {
  472         int             vc_vers;        /* should be VFSIDCTL_VERS1 (below) */
  473         fsid_t          vc_fsid;        /* fsid to operate on */
  474         char            vc_fstypename[MFSNAMELEN];
  475                                         /* type of fs 'nfs' or '*' */
  476         fsctlop_t       vc_op;          /* operation VFS_CTL_* (below) */
  477         void            *vc_ptr;        /* pointer to data structure */
  478         size_t          vc_len;         /* sizeof said structure */
  479         u_int32_t       vc_spare[12];   /* spare (must be zero) */
  480 };
  481 
  482 /* vfsidctl API version. */
  483 #define VFS_CTL_VERS1   0x01
  484 
  485 /*
  486  * New style VFS sysctls, do not reuse/conflict with the namespace for
  487  * private sysctls.
  488  * All "global" sysctl ops have the 33rd bit set:
  489  * 0x...1....
  490  * Private sysctl ops should have the 33rd bit unset.
  491  */
  492 #define VFS_CTL_QUERY   0x00010001      /* anything wrong? (vfsquery) */
  493 #define VFS_CTL_TIMEO   0x00010002      /* set timeout for vfs notification */
  494 #define VFS_CTL_NOLOCKS 0x00010003      /* disable file locking */
  495 
  496 struct vfsquery {
  497         u_int32_t       vq_flags;
  498         u_int32_t       vq_spare[31];
  499 };
  500 
  501 /* vfsquery flags */
  502 #define VQ_NOTRESP      0x0001  /* server down */
  503 #define VQ_NEEDAUTH     0x0002  /* server bad auth */
  504 #define VQ_LOWDISK      0x0004  /* we're low on space */
  505 #define VQ_MOUNT        0x0008  /* new filesystem arrived */
  506 #define VQ_UNMOUNT      0x0010  /* filesystem has left */
  507 #define VQ_DEAD         0x0020  /* filesystem is dead, needs force unmount */
  508 #define VQ_ASSIST       0x0040  /* filesystem needs assistance from external
  509                                    program */
  510 #define VQ_NOTRESPLOCK  0x0080  /* server lockd down */
  511 #define VQ_FLAG0100     0x0100  /* placeholder */
  512 #define VQ_FLAG0200     0x0200  /* placeholder */
  513 #define VQ_FLAG0400     0x0400  /* placeholder */
  514 #define VQ_FLAG0800     0x0800  /* placeholder */
  515 #define VQ_FLAG1000     0x1000  /* placeholder */
  516 #define VQ_FLAG2000     0x2000  /* placeholder */
  517 #define VQ_FLAG4000     0x4000  /* placeholder */
  518 #define VQ_FLAG8000     0x8000  /* placeholder */
  519 
  520 #ifdef _KERNEL
  521 /* Point a sysctl request at a vfsidctl's data. */
  522 #define VCTLTOREQ(vc, req)                                              \
  523         do {                                                            \
  524                 (req)->newptr = (vc)->vc_ptr;                           \
  525                 (req)->newlen = (vc)->vc_len;                           \
  526                 (req)->newidx = 0;                                      \
  527         } while (0)
  528 #endif
  529 
  530 struct iovec;
  531 struct uio;
  532 
  533 #ifdef _KERNEL
  534 
  535 /*
  536  * vfs_busy specific flags and mask.
  537  */
  538 #define MBF_NOWAIT      0x01
  539 #define MBF_MNTLSTLOCK  0x02
  540 #define MBF_MASK        (MBF_NOWAIT | MBF_MNTLSTLOCK)
  541 
  542 #ifdef MALLOC_DECLARE
  543 MALLOC_DECLARE(M_MOUNT);
  544 #endif
  545 extern int maxvfsconf;          /* highest defined filesystem type */
  546 extern int nfs_mount_type;      /* vfc_typenum for nfs, or -1 */
  547 
  548 TAILQ_HEAD(vfsconfhead, vfsconf);
  549 extern struct vfsconfhead vfsconf;
  550 
  551 /*
  552  * Operations supported on mounted filesystem.
  553  */
  554 struct mount_args;
  555 struct nameidata;
  556 struct sysctl_req;
  557 struct mntarg;
  558 
  559 typedef int vfs_cmount_t(struct mntarg *ma, void *data, int flags);
  560 typedef int vfs_unmount_t(struct mount *mp, int mntflags);
  561 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);
  562 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg);
  563 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp);
  564 typedef int vfs_sync_t(struct mount *mp, int waitfor);
  565 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
  566                     struct vnode **vpp);
  567 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp);
  568 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
  569                     int *extflagsp, struct ucred **credanonp,
  570                     int *numsecflavors, int **secflavors);
  571 typedef int vfs_init_t(struct vfsconf *);
  572 typedef int vfs_uninit_t(struct vfsconf *);
  573 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
  574                     struct vnode *filename_vp, int attrnamespace,
  575                     const char *attrname);
  576 typedef int vfs_mount_t(struct mount *mp);
  577 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
  578                     struct sysctl_req *req);
  579 typedef void vfs_susp_clean_t(struct mount *mp);
  580 
  581 struct vfsops {
  582         vfs_mount_t             *vfs_mount;
  583         vfs_cmount_t            *vfs_cmount;
  584         vfs_unmount_t           *vfs_unmount;
  585         vfs_root_t              *vfs_root;
  586         vfs_quotactl_t          *vfs_quotactl;
  587         vfs_statfs_t            *vfs_statfs;
  588         vfs_sync_t              *vfs_sync;
  589         vfs_vget_t              *vfs_vget;
  590         vfs_fhtovp_t            *vfs_fhtovp;
  591         vfs_checkexp_t          *vfs_checkexp;
  592         vfs_init_t              *vfs_init;
  593         vfs_uninit_t            *vfs_uninit;
  594         vfs_extattrctl_t        *vfs_extattrctl;
  595         vfs_sysctl_t            *vfs_sysctl;
  596         vfs_susp_clean_t        *vfs_susp_clean;
  597 };
  598 
  599 vfs_statfs_t    __vfs_statfs;
  600 
  601 #define VFS_MOUNT(MP)           (*(MP)->mnt_op->vfs_mount)(MP)
  602 #define VFS_UNMOUNT(MP, FORCE)  (*(MP)->mnt_op->vfs_unmount)(MP, FORCE)
  603 #define VFS_ROOT(MP, FLAGS, VPP)                                        \
  604         (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP)
  605 #define VFS_QUOTACTL(MP, C, U, A)                                       \
  606         (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A)
  607 #define VFS_STATFS(MP, SBP)     __vfs_statfs((MP), (SBP))
  608 #define VFS_SYNC(MP, WAIT)      (*(MP)->mnt_op->vfs_sync)(MP, WAIT)
  609 #define VFS_VGET(MP, INO, FLAGS, VPP) \
  610         (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP)
  611 #define VFS_FHTOVP(MP, FIDP, VPP) \
  612         (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP)
  613 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) \
  614         (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC, SEC)
  615 #define VFS_EXTATTRCTL(MP, C, FN, NS, N)                                \
  616         (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N)
  617 #define VFS_SYSCTL(MP, OP, REQ) \
  618         (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ)
  619 #define VFS_SUSP_CLEAN(MP) \
  620         ({if (*(MP)->mnt_op->vfs_susp_clean != NULL)            \
  621                (*(MP)->mnt_op->vfs_susp_clean)(MP); })
  622 
  623 #define VFS_NEEDSGIANT_(MP)                                             \
  624     ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0)
  625 
  626 #define VFS_NEEDSGIANT(MP) __extension__                                \
  627 ({                                                                      \
  628         struct mount *_mp;                                              \
  629         _mp = (MP);                                                     \
  630         VFS_NEEDSGIANT_(_mp);                                           \
  631 })
  632 
  633 #define VFS_LOCK_GIANT(MP) __extension__                                \
  634 ({                                                                      \
  635         int _locked;                                                    \
  636         struct mount *_mp;                                              \
  637         _mp = (MP);                                                     \
  638         if (VFS_NEEDSGIANT_(_mp)) {                                     \
  639                 mtx_lock(&Giant);                                       \
  640                 _locked = 1;                                            \
  641         } else                                                          \
  642                 _locked = 0;                                            \
  643         _locked;                                                        \
  644 })
  645 #define VFS_UNLOCK_GIANT(locked)        if ((locked)) mtx_unlock(&Giant);
  646 #define VFS_ASSERT_GIANT(MP) do                                         \
  647 {                                                                       \
  648         struct mount *_mp;                                              \
  649         _mp = (MP);                                                     \
  650         if (VFS_NEEDSGIANT_(_mp))                                       \
  651                 mtx_assert(&Giant, MA_OWNED);                           \
  652 } while (0)
  653 
  654 #define VFS_KNOTE_LOCKED(vp, hint) do                                   \
  655 {                                                                       \
  656         if (((vp)->v_vflag & VV_NOKNOTE) == 0)                          \
  657                 VN_KNOTE((vp), (hint), KNF_LISTLOCKED);                 \
  658 } while (0)
  659 
  660 #define VFS_KNOTE_UNLOCKED(vp, hint) do                                 \
  661 {                                                                       \
  662         if (((vp)->v_vflag & VV_NOKNOTE) == 0)                          \
  663                 VN_KNOTE((vp), (hint), 0);                              \
  664 } while (0)
  665 
  666 #include <sys/module.h>
  667 
  668 /*
  669  * Version numbers.
  670  */
  671 #define VFS_VERSION_00  0x19660120
  672 #define VFS_VERSION     VFS_VERSION_00
  673 
  674 #define VFS_SET(vfsops, fsname, flags) \
  675         static struct vfsconf fsname ## _vfsconf = {            \
  676                 .vfc_version = VFS_VERSION,                     \
  677                 .vfc_name = #fsname,                            \
  678                 .vfc_vfsops = &vfsops,                          \
  679                 .vfc_typenum = -1,                              \
  680                 .vfc_flags = flags,                             \
  681         };                                                      \
  682         static moduledata_t fsname ## _mod = {                  \
  683                 #fsname,                                        \
  684                 vfs_modevent,                                   \
  685                 & fsname ## _vfsconf                            \
  686         };                                                      \
  687         DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
  688 
  689 extern  char *mountrootfsname;
  690 
  691 /*
  692  * exported vnode operations
  693  */
  694 
  695 int     dounmount(struct mount *, int, struct thread *);
  696 
  697 int     kernel_mount(struct mntarg *ma, int flags);
  698 int     kernel_vmount(int flags, ...);
  699 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
  700 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
  701 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
  702 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
  703 void    statfs_scale_blocks(struct statfs *sf, long max_size);
  704 struct vfsconf *vfs_byname(const char *);
  705 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
  706 void    vfs_mount_destroy(struct mount *);
  707 void    vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
  708 void    vfs_freeopts(struct vfsoptlist *opts);
  709 void    vfs_deleteopt(struct vfsoptlist *opts, const char *name);
  710 int     vfs_buildopts(struct uio *auio, struct vfsoptlist **options);
  711 int     vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val);
  712 int     vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
  713 int     vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
  714 char    *vfs_getopts(struct vfsoptlist *, const char *, int *error);
  715 int     vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
  716 int     vfs_filteropt(struct vfsoptlist *, const char **legal);
  717 void    vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...);
  718 int     vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
  719 int     vfs_setopt(struct vfsoptlist *opts, const char *name, void *value,
  720             int len);
  721 int     vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value,
  722             int len);
  723 int     vfs_setopts(struct vfsoptlist *opts, const char *name,
  724             const char *value);
  725 int     vfs_setpublicfs                     /* set publicly exported fs */
  726             (struct mount *, struct netexport *, struct export_args *);
  727 void    vfs_msync(struct mount *, int);
  728 int     vfs_busy(struct mount *, int);
  729 int     vfs_export                       /* process mount export info */
  730             (struct mount *, struct export_args *);
  731 int     vfs_allocate_syncvnode(struct mount *);
  732 int     vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions);
  733 void    vfs_getnewfsid(struct mount *);
  734 struct cdev *vfs_getrootfsid(struct mount *);
  735 struct  mount *vfs_getvfs(fsid_t *);      /* return vfs given fsid */
  736 struct  mount *vfs_busyfs(fsid_t *);
  737 int     vfs_modevent(module_t, int, void *);
  738 void    vfs_mount_error(struct mount *, const char *, ...);
  739 void    vfs_mountroot(void);                    /* mount our root filesystem */
  740 void    vfs_mountedfrom(struct mount *, const char *from);
  741 void    vfs_oexport_conv(const struct oexport_args *oexp,
  742             struct export_args *exp);
  743 void    vfs_ref(struct mount *);
  744 void    vfs_rel(struct mount *);
  745 struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
  746             struct ucred *);
  747 int     vfs_suser(struct mount *, struct thread *);
  748 void    vfs_unbusy(struct mount *);
  749 void    vfs_unmountall(void);
  750 extern  TAILQ_HEAD(mntlist, mount) mountlist;   /* mounted filesystem list */
  751 extern  struct mtx mountlist_mtx;
  752 extern  struct nfs_public nfs_pub;
  753 
  754 /*
  755  * Declarations for these vfs default operations are located in
  756  * kern/vfs_default.c, they should be used instead of making "dummy"
  757  * functions or casting entries in the VFS op table to "enopnotsupp()".
  758  */
  759 vfs_root_t              vfs_stdroot;
  760 vfs_quotactl_t          vfs_stdquotactl;
  761 vfs_statfs_t            vfs_stdstatfs;
  762 vfs_sync_t              vfs_stdsync;
  763 vfs_sync_t              vfs_stdnosync;
  764 vfs_vget_t              vfs_stdvget;
  765 vfs_fhtovp_t            vfs_stdfhtovp;
  766 vfs_checkexp_t          vfs_stdcheckexp;
  767 vfs_init_t              vfs_stdinit;
  768 vfs_uninit_t            vfs_stduninit;
  769 vfs_extattrctl_t        vfs_stdextattrctl;
  770 vfs_sysctl_t            vfs_stdsysctl;
  771 
  772 #else /* !_KERNEL */
  773 
  774 #include <sys/cdefs.h>
  775 
  776 struct stat;
  777 
  778 __BEGIN_DECLS
  779 int     fhopen(const struct fhandle *, int);
  780 int     fhstat(const struct fhandle *, struct stat *);
  781 int     fhstatfs(const struct fhandle *, struct statfs *);
  782 int     fstatfs(int, struct statfs *);
  783 int     getfh(const char *, fhandle_t *);
  784 int     getfsstat(struct statfs *, long, int);
  785 int     getmntinfo(struct statfs **, int);
  786 int     lgetfh(const char *, fhandle_t *);
  787 int     mount(const char *, const char *, int, void *);
  788 int     nmount(struct iovec *, unsigned int, int);
  789 int     statfs(const char *, struct statfs *);
  790 int     unmount(const char *, int);
  791 
  792 /* C library stuff */
  793 int     getvfsbyname(const char *, struct xvfsconf *);
  794 __END_DECLS
  795 
  796 #endif /* _KERNEL */
  797 
  798 #endif /* !_SYS_MOUNT_H_ */

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