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/6.0/sys/sys/mount.h 149066 2005-08-15 06:01:36Z ssouhlal $
   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  */
  138 struct mount {
  139         TAILQ_ENTRY(mount) mnt_list;            /* mount list */
  140         struct vfsops   *mnt_op;                /* operations on fs */
  141         struct vfsconf  *mnt_vfc;               /* configuration info */
  142         struct vnode    *mnt_vnodecovered;      /* vnode we mounted on */
  143         struct vnode    *mnt_syncer;            /* syncer vnode */
  144         struct vnodelst mnt_nvnodelist;         /* list of vnodes this mount */
  145         struct lock     mnt_lock;               /* mount structure lock */
  146         struct mtx      mnt_mtx;                /* mount structure interlock */
  147         int             mnt_writeopcount;       /* write syscalls in progress */
  148         u_int           mnt_flag;               /* flags shared with user */
  149         struct vfsoptlist *mnt_opt;             /* current mount options */
  150         struct vfsoptlist *mnt_optnew;          /* new options passed to fs */
  151         int             mnt_kern_flag;          /* kernel only flags */
  152         int             mnt_maxsymlinklen;      /* max size of short symlink */
  153         struct statfs   mnt_stat;               /* cache of filesystem stats */
  154         struct ucred    *mnt_cred;              /* credentials of mounter */
  155         void *          mnt_data;               /* private data */
  156         time_t          mnt_time;               /* last time written*/
  157         int             mnt_iosize_max;         /* max size for clusters, etc */
  158         struct netexport *mnt_export;           /* export list */
  159         struct label    *mnt_mntlabel;          /* MAC label for the mount */
  160         struct label    *mnt_fslabel;           /* MAC label for the fs */
  161         int             mnt_nvnodelistsize;     /* # of vnodes on this mount */
  162         u_int           mnt_hashseed;           /* Random seed for vfs_hash */
  163 };
  164 
  165 struct vnode *__mnt_vnode_next(struct vnode **nvp, struct mount *mp);
  166 
  167 #define MNT_VNODE_FOREACH(vp, mp, vp2) \
  168         for ((vp2) = TAILQ_FIRST(&(mp)->mnt_nvnodelist);        \
  169                 (vp = __mnt_vnode_next(&(vp2), (mp))) != NULL;)
  170 
  171 
  172 #define MNT_ILOCK(mp)   mtx_lock(&(mp)->mnt_mtx)
  173 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
  174 #define MNT_MTX(mp)     (&(mp)->mnt_mtx)
  175 
  176 #endif /* _KERNEL */
  177 
  178 /*
  179  * User specifiable flags.
  180  */
  181 #define MNT_RDONLY      0x00000001      /* read only filesystem */
  182 #define MNT_SYNCHRONOUS 0x00000002      /* filesystem written synchronously */
  183 #define MNT_NOEXEC      0x00000004      /* can't exec from filesystem */
  184 #define MNT_NOSUID      0x00000008      /* don't honor setuid bits on fs */
  185 #define MNT_NODEV       0               /* Deprecated option */
  186 #define MNT_UNION       0x00000020      /* union with underlying filesystem */
  187 #define MNT_ASYNC       0x00000040      /* filesystem written asynchronously */
  188 #define MNT_SUIDDIR     0x00100000      /* special handling of SUID on dirs */
  189 #define MNT_SOFTDEP     0x00200000      /* soft updates being done */
  190 #define MNT_NOSYMFOLLOW 0x00400000      /* do not follow symlinks */
  191 #define MNT_JAILDEVFS   0x02000000      /* jail-friendly DEVFS behaviour */
  192 #define MNT_MULTILABEL  0x04000000      /* MAC support for individual objects */
  193 #define MNT_ACLS        0x08000000      /* ACL support enabled */
  194 #define MNT_NOATIME     0x10000000      /* disable update of file access time */
  195 #define MNT_NOCLUSTERR  0x40000000      /* disable cluster read */
  196 #define MNT_NOCLUSTERW  0x80000000      /* disable cluster write */
  197 
  198 /*
  199  * NFS export related mount flags.
  200  */
  201 #define MNT_EXRDONLY    0x00000080      /* exported read only */
  202 #define MNT_EXPORTED    0x00000100      /* filesystem is exported */
  203 #define MNT_DEFEXPORTED 0x00000200      /* exported to the world */
  204 #define MNT_EXPORTANON  0x00000400      /* use anon uid mapping for everyone */
  205 #define MNT_EXKERB      0x00000800      /* exported with Kerberos uid mapping */
  206 #define MNT_EXPUBLIC    0x20000000      /* public export (WebNFS) */
  207 
  208 /*
  209  * Flags set by internal operations,
  210  * but visible to the user.
  211  * XXX some of these are not quite right.. (I've never seen the root flag set)
  212  */
  213 #define MNT_LOCAL       0x00001000      /* filesystem is stored locally */
  214 #define MNT_QUOTA       0x00002000      /* quotas are enabled on filesystem */
  215 #define MNT_ROOTFS      0x00004000      /* identifies the root filesystem */
  216 #define MNT_USER        0x00008000      /* mounted by a user */
  217 #define MNT_IGNORE      0x00800000      /* do not show entry in df */
  218 
  219 /*
  220  * Mask of flags that are visible to statfs().
  221  * XXX I think that this could now become (~(MNT_CMDFLAGS))
  222  * but the 'mount' program may need changing to handle this.
  223  */
  224 #define MNT_VISFLAGMASK (MNT_RDONLY     | MNT_SYNCHRONOUS | MNT_NOEXEC  | \
  225                         MNT_NOSUID      | MNT_UNION     | \
  226                         MNT_ASYNC       | MNT_EXRDONLY  | MNT_EXPORTED  | \
  227                         MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB    | \
  228                         MNT_LOCAL       | MNT_USER      | MNT_QUOTA     | \
  229                         MNT_ROOTFS      | MNT_NOATIME   | MNT_NOCLUSTERR| \
  230                         MNT_NOCLUSTERW  | MNT_SUIDDIR   | MNT_SOFTDEP   | \
  231                         MNT_IGNORE      | MNT_EXPUBLIC  | MNT_NOSYMFOLLOW | \
  232                         MNT_JAILDEVFS   | MNT_MULTILABEL | MNT_ACLS)
  233 
  234 /* Mask of flags that can be updated. */
  235 #define MNT_UPDATEMASK (MNT_NOSUID      | MNT_NOEXEC    | \
  236                         MNT_SYNCHRONOUS | MNT_UNION     | MNT_ASYNC     | \
  237                         MNT_NOATIME | \
  238                         MNT_NOSYMFOLLOW | MNT_IGNORE    | MNT_JAILDEVFS | \
  239                         MNT_NOCLUSTERR  | MNT_NOCLUSTERW | MNT_SUIDDIR  | \
  240                         MNT_ACLS        | MNT_USER)
  241 
  242 /*
  243  * External filesystem command modifier flags.
  244  * Unmount can use the MNT_FORCE flag.
  245  * XXX These are not STATES and really should be somewhere else.
  246  */
  247 #define MNT_UPDATE      0x00010000      /* not a real mount, just an update */
  248 #define MNT_DELEXPORT   0x00020000      /* delete export host lists */
  249 #define MNT_RELOAD      0x00040000      /* reload filesystem data */
  250 #define MNT_FORCE       0x00080000      /* force unmount or readonly change */
  251 #define MNT_SNAPSHOT    0x01000000      /* snapshot the filesystem */
  252 #define MNT_BYFSID      0x08000000      /* specify filesystem by ID. */
  253 #define MNT_CMDFLAGS   (MNT_UPDATE      | MNT_DELEXPORT | MNT_RELOAD    | \
  254                         MNT_FORCE       | MNT_SNAPSHOT  | MNT_BYFSID)
  255 /*
  256  * Internal filesystem control flags stored in mnt_kern_flag.
  257  *
  258  * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
  259  * past the mount point.  This keeps the subtree stable during mounts
  260  * and unmounts.
  261  *
  262  * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
  263  * dounmount() is still waiting to lock the mountpoint. This allows
  264  * the filesystem to cancel operations that might otherwise deadlock
  265  * with the unmount attempt (used by NFS).
  266  */
  267 #define MNTK_UNMOUNTF   0x00000001      /* forced unmount in progress */
  268 #define MNTK_UNMOUNT    0x01000000      /* unmount in progress */
  269 #define MNTK_MWAIT      0x02000000      /* waiting for unmount to finish */
  270 #define MNTK_SUSPEND    0x08000000      /* request write suspension */
  271 #define MNTK_SUSPENDED  0x10000000      /* write operations are suspended */
  272 #define MNTK_MPSAFE     0x20000000      /* Filesystem is MPSAFE. */
  273 #define MNTK_NOKNOTE    0x80000000      /* Don't send KNOTEs from VOP hooks */
  274 
  275 /*
  276  * Sysctl CTL_VFS definitions.
  277  *
  278  * Second level identifier specifies which filesystem. Second level
  279  * identifier VFS_VFSCONF returns information about all filesystems.
  280  * Second level identifier VFS_GENERIC is non-terminal.
  281  */
  282 #define VFS_VFSCONF             0       /* get configured filesystems */
  283 #define VFS_GENERIC             0       /* generic filesystem information */
  284 /*
  285  * Third level identifiers for VFS_GENERIC are given below; third
  286  * level identifiers for specific filesystems are given in their
  287  * mount specific header files.
  288  */
  289 #define VFS_MAXTYPENUM  1       /* int: highest defined filesystem type */
  290 #define VFS_CONF        2       /* struct: vfsconf for filesystem given
  291                                    as next argument */
  292 
  293 /*
  294  * Flags for various system call interfaces.
  295  *
  296  * waitfor flags to vfs_sync() and getfsstat()
  297  */
  298 #define MNT_WAIT        1       /* synchronously wait for I/O to complete */
  299 #define MNT_NOWAIT      2       /* start all I/O, but do not wait for it */
  300 #define MNT_LAZY        3       /* push data not written by filesystem syncer */
  301 
  302 /*
  303  * Generic file handle
  304  */
  305 struct fhandle {
  306         fsid_t  fh_fsid;        /* Filesystem id of mount point */
  307         struct  fid fh_fid;     /* Filesys specific id */
  308 };
  309 typedef struct fhandle  fhandle_t;
  310 
  311 /*
  312  * Export arguments for local filesystem mount calls.
  313  */
  314 struct export_args {
  315         int     ex_flags;               /* export related flags */
  316         uid_t   ex_root;                /* mapping for root uid */
  317         struct  xucred ex_anon;         /* mapping for anonymous user */
  318         struct  sockaddr *ex_addr;      /* net address to which exported */
  319         u_char  ex_addrlen;             /* and the net address length */
  320         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  321         u_char  ex_masklen;             /* and the smask length */
  322         char    *ex_indexfile;          /* index file for WebNFS URLs */
  323 };
  324 
  325 /*
  326  * Structure holding information for a publicly exported filesystem
  327  * (WebNFS). Currently the specs allow just for one such filesystem.
  328  */
  329 struct nfs_public {
  330         int             np_valid;       /* Do we hold valid information */
  331         fhandle_t       np_handle;      /* Filehandle for pub fs (internal) */
  332         struct mount    *np_mount;      /* Mountpoint of exported fs */
  333         char            *np_index;      /* Index file */
  334 };
  335 
  336 /*
  337  * Filesystem configuration information. One of these exists for each
  338  * type of filesystem supported by the kernel. These are searched at
  339  * mount time to identify the requested filesystem.
  340  *
  341  * XXX: Never change the first two arguments!
  342  */
  343 struct vfsconf {
  344         u_int   vfc_version;            /* ABI version number */
  345         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  346         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  347         int     vfc_typenum;            /* historic filesystem type number */
  348         int     vfc_refcount;           /* number mounted of this type */
  349         int     vfc_flags;              /* permanent flags */
  350         struct  vfsoptdecl *vfc_opts;   /* mount options */
  351         TAILQ_ENTRY(vfsconf) vfc_list;  /* list of vfscons */
  352 };
  353 
  354 /* Userland version of the struct vfsconf. */
  355 struct xvfsconf {
  356         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  357         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  358         int     vfc_typenum;            /* historic filesystem type number */
  359         int     vfc_refcount;           /* number mounted of this type */
  360         int     vfc_flags;              /* permanent flags */
  361         struct  vfsconf *vfc_next;      /* next in list */
  362 };
  363 
  364 #ifndef BURN_BRIDGES
  365 struct ovfsconf {
  366         void    *vfc_vfsops;
  367         char    vfc_name[32];
  368         int     vfc_index;
  369         int     vfc_refcount;
  370         int     vfc_flags;
  371 };
  372 #endif
  373 
  374 /*
  375  * NB: these flags refer to IMPLEMENTATION properties, not properties of
  376  * any actual mounts; i.e., it does not make sense to change the flags.
  377  */
  378 #define VFCF_STATIC     0x00010000      /* statically compiled into kernel */
  379 #define VFCF_NETWORK    0x00020000      /* may get data over the network */
  380 #define VFCF_READONLY   0x00040000      /* writes are not implemented */
  381 #define VFCF_SYNTHETIC  0x00080000      /* data does not represent real files */
  382 #define VFCF_LOOPBACK   0x00100000      /* aliases some other mounted FS */
  383 #define VFCF_UNICODE    0x00200000      /* stores file names as Unicode*/
  384 
  385 typedef uint32_t fsctlop_t;
  386 
  387 struct vfsidctl {
  388         int             vc_vers;        /* should be VFSIDCTL_VERS1 (below) */
  389         fsid_t          vc_fsid;        /* fsid to operate on. */
  390         char            vc_fstypename[MFSNAMELEN];
  391                                         /* type of fs 'nfs' or '*' */
  392         fsctlop_t       vc_op;          /* operation VFS_CTL_* (below) */
  393         void            *vc_ptr;        /* pointer to data structure. */
  394         size_t          vc_len;         /* sizeof said structure. */
  395         u_int32_t       vc_spare[12];   /* spare (must be zero). */
  396 };
  397 
  398 /* vfsidctl API version. */
  399 #define VFS_CTL_VERS1   0x01
  400 
  401 /*
  402  * New style VFS sysctls, do not reuse/conflict with the namespace for
  403  * private sysctls.
  404  * All "global" sysctl ops have the 33rd bit set:
  405  * 0x...1....
  406  * Private sysctl ops should have the 33rd bit unset.
  407  */
  408 #define VFS_CTL_QUERY   0x00010001      /* anything wrong? (vfsquery) */
  409 #define VFS_CTL_TIMEO   0x00010002      /* set timeout for vfs notification */
  410 #define VFS_CTL_NOLOCKS 0x00010003      /* disable file locking */
  411 
  412 struct vfsquery {
  413         u_int32_t       vq_flags;
  414         u_int32_t       vq_spare[31];
  415 };
  416 
  417 /* vfsquery flags */
  418 #define VQ_NOTRESP      0x0001  /* server down */
  419 #define VQ_NEEDAUTH     0x0002  /* server bad auth */
  420 #define VQ_LOWDISK      0x0004  /* we're low on space */
  421 #define VQ_MOUNT        0x0008  /* new filesystem arrived */
  422 #define VQ_UNMOUNT      0x0010  /* filesystem has left */
  423 #define VQ_DEAD         0x0020  /* filesystem is dead, needs force unmount */
  424 #define VQ_ASSIST       0x0040  /* filesystem needs assistance from external
  425                                    program */
  426 #define VQ_NOTRESPLOCK  0x0080  /* server lockd down */
  427 #define VQ_FLAG0100     0x0100  /* placeholder */
  428 #define VQ_FLAG0200     0x0200  /* placeholder */
  429 #define VQ_FLAG0400     0x0400  /* placeholder */
  430 #define VQ_FLAG0800     0x0800  /* placeholder */
  431 #define VQ_FLAG1000     0x1000  /* placeholder */
  432 #define VQ_FLAG2000     0x2000  /* placeholder */
  433 #define VQ_FLAG4000     0x4000  /* placeholder */
  434 #define VQ_FLAG8000     0x8000  /* placeholder */
  435 
  436 #ifdef _KERNEL
  437 /* Point a sysctl request at a vfsidctl's data. */
  438 #define VCTLTOREQ(vc, req)                                              \
  439         do {                                                            \
  440                 (req)->newptr = (vc)->vc_ptr;                           \
  441                 (req)->newlen = (vc)->vc_len;                           \
  442                 (req)->newidx = 0;                                      \
  443         } while (0)
  444 #endif
  445 
  446 struct iovec;
  447 struct uio;
  448 
  449 #ifdef _KERNEL
  450 
  451 #ifdef MALLOC_DECLARE
  452 MALLOC_DECLARE(M_MOUNT);
  453 #endif
  454 extern int maxvfsconf;          /* highest defined filesystem type */
  455 extern int nfs_mount_type;      /* vfc_typenum for nfs, or -1 */
  456 
  457 TAILQ_HEAD(vfsconfhead, vfsconf);
  458 extern struct vfsconfhead vfsconf;
  459 
  460 /*
  461  * Operations supported on mounted filesystem.
  462  */
  463 struct mount_args;
  464 struct nameidata;
  465 struct sysctl_req;
  466 struct mntarg;
  467 
  468 typedef int vfs_cmount_t(struct mntarg *ma, void *data, int flags, struct thread *td);
  469 typedef int vfs_unmount_t(struct mount *mp, int mntflags, struct thread *td);
  470 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp,
  471                     struct thread *td);
  472 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid,
  473                     caddr_t arg, struct thread *td);
  474 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp,
  475                     struct thread *td);
  476 typedef int vfs_sync_t(struct mount *mp, int waitfor, struct thread *td);
  477 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
  478                     struct vnode **vpp);
  479 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp);
  480 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
  481                     int *extflagsp, struct ucred **credanonp);
  482 typedef int vfs_vptofh_t(struct vnode *vp, struct fid *fhp);
  483 typedef int vfs_init_t(struct vfsconf *);
  484 typedef int vfs_uninit_t(struct vfsconf *);
  485 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
  486                     struct vnode *filename_vp, int attrnamespace,
  487                     const char *attrname, struct thread *td);
  488 typedef int vfs_mount_t(struct mount *mp, struct thread *td);
  489 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
  490                     struct sysctl_req *req);
  491 
  492 struct vfsops {
  493         vfs_mount_t             *vfs_mount;
  494         vfs_cmount_t            *vfs_cmount;
  495         vfs_unmount_t           *vfs_unmount;
  496         vfs_root_t              *vfs_root;
  497         vfs_quotactl_t          *vfs_quotactl;
  498         vfs_statfs_t            *vfs_statfs;
  499         vfs_sync_t              *vfs_sync;
  500         vfs_vget_t              *vfs_vget;
  501         vfs_fhtovp_t            *vfs_fhtovp;
  502         vfs_checkexp_t          *vfs_checkexp;
  503         vfs_vptofh_t            *vfs_vptofh;
  504         vfs_init_t              *vfs_init;
  505         vfs_uninit_t            *vfs_uninit;
  506         vfs_extattrctl_t        *vfs_extattrctl;
  507         vfs_sysctl_t            *vfs_sysctl;
  508 };
  509 
  510 vfs_statfs_t    __vfs_statfs;
  511 
  512 #define VFS_MOUNT(MP, P)    (*(MP)->mnt_op->vfs_mount)(MP, P)
  513 #define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P)
  514 #define VFS_ROOT(MP, FLAGS, VPP, P) \
  515         (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP, P)
  516 #define VFS_QUOTACTL(MP,C,U,A,P)  (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P)
  517 #define VFS_STATFS(MP, SBP, P)    __vfs_statfs((MP), (SBP), (P))
  518 #define VFS_SYNC(MP, WAIT, P)  (*(MP)->mnt_op->vfs_sync)(MP, WAIT, P)
  519 #define VFS_VGET(MP, INO, FLAGS, VPP) \
  520         (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP)
  521 #define VFS_FHTOVP(MP, FIDP, VPP) \
  522         (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP)
  523 #define VFS_VPTOFH(VP, FIDP)      (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP)
  524 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \
  525         (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED)
  526 #define VFS_EXTATTRCTL(MP, C, FN, NS, N, P) \
  527         (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N, P)
  528 #define VFS_SYSCTL(MP, OP, REQ) \
  529         (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ)
  530 
  531 extern int mpsafe_vfs;
  532 
  533 #define VFS_NEEDSGIANT(MP)                                              \
  534     (!mpsafe_vfs || ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0))
  535 
  536 #define VFS_LOCK_GIANT(MP) __extension__                                \
  537 ({                                                                      \
  538         int _locked;                                                    \
  539         if (VFS_NEEDSGIANT((MP))) {                                     \
  540                 mtx_lock(&Giant);                                       \
  541                 _locked = 1;                                            \
  542         } else                                                          \
  543                 _locked = 0;                                            \
  544         _locked;                                                        \
  545 })
  546 #define VFS_UNLOCK_GIANT(locked)        if ((locked)) mtx_unlock(&Giant);
  547 #define VFS_ASSERT_GIANT(MP) do                                         \
  548 {                                                                       \
  549         if (VFS_NEEDSGIANT((MP)))                                       \
  550                 mtx_assert(&Giant, MA_OWNED);                           \
  551 } while (0)
  552 
  553 #define VFS_KNOTE_LOCKED(vp, hint) do                                   \
  554 {                                                                       \
  555         if (((vp)->v_vflag & VV_NOKNOTE) == 0)                          \
  556                 VN_KNOTE((vp), (hint), 1);                              \
  557 } while (0)
  558 
  559 #define VFS_KNOTE_UNLOCKED(vp, hint) do                                 \
  560 {                                                                       \
  561         if (((vp)->v_vflag & VV_NOKNOTE) == 0)                          \
  562                 VN_KNOTE((vp), (hint), 0);                              \
  563 } while (0)
  564 
  565 #include <sys/module.h>
  566 
  567 /*
  568  * Version numbers.
  569  */
  570 #define VFS_VERSION_00  0x19660120
  571 #define VFS_VERSION     VFS_VERSION_00
  572 
  573 #define VFS_SET(vfsops, fsname, flags) \
  574         static struct vfsconf fsname ## _vfsconf = {            \
  575                 .vfc_version = VFS_VERSION,                     \
  576                 .vfc_name = #fsname,                            \
  577                 .vfc_vfsops = &vfsops,                          \
  578                 .vfc_typenum = -1,                              \
  579                 .vfc_flags = flags,                             \
  580         };                                                      \
  581         static moduledata_t fsname ## _mod = {                  \
  582                 #fsname,                                        \
  583                 vfs_modevent,                                   \
  584                 & fsname ## _vfsconf                            \
  585         };                                                      \
  586         DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
  587 
  588 extern  char *mountrootfsname;
  589 
  590 /*
  591  * exported vnode operations
  592  */
  593 
  594 int     dounmount(struct mount *, int, struct thread *);
  595 
  596 int     kernel_mount(struct mntarg *ma, int flags);
  597 int     kernel_vmount(int flags, ...);
  598 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
  599 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
  600 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
  601 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
  602 struct vfsconf *vfs_byname(const char *);
  603 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
  604 void    vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
  605 int     vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val);
  606 int     vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
  607 char    *vfs_getopts(struct vfsoptlist *, const char *, int *error);
  608 int     vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
  609 int     vfs_filteropt(struct vfsoptlist *, const char **legal);
  610 int     vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
  611 int     vfs_setpublicfs                     /* set publicly exported fs */
  612             (struct mount *, struct netexport *, struct export_args *);
  613 int     vfs_lock(struct mount *);         /* lock a vfs */
  614 void    vfs_msync(struct mount *, int);
  615 void    vfs_unlock(struct mount *);       /* unlock a vfs */
  616 int     vfs_busy(struct mount *, int, struct mtx *, struct thread *);
  617 int     vfs_export                       /* process mount export info */
  618             (struct mount *, struct export_args *);
  619 int     vfs_allocate_syncvnode(struct mount *);
  620 void    vfs_getnewfsid(struct mount *);
  621 struct cdev *vfs_getrootfsid(struct mount *);
  622 struct  mount *vfs_getvfs(fsid_t *);      /* return vfs given fsid */
  623 int     vfs_modevent(module_t, int, void *);
  624 void    vfs_mountroot(void);                    /* mount our root filesystem */
  625 void    vfs_mountedfrom(struct mount *, const char *from);
  626 int     vfs_suser(struct mount *, struct thread *);
  627 void    vfs_unbusy(struct mount *, struct thread *);
  628 void    vfs_unmountall(void);
  629 extern  TAILQ_HEAD(mntlist, mount) mountlist;   /* mounted filesystem list */
  630 extern  struct mtx mountlist_mtx;
  631 extern  struct nfs_public nfs_pub;
  632 
  633 /*
  634  * Declarations for these vfs default operations are located in
  635  * kern/vfs_default.c, they should be used instead of making "dummy"
  636  * functions or casting entries in the VFS op table to "enopnotsupp()".
  637  */
  638 vfs_root_t              vfs_stdroot;
  639 vfs_quotactl_t          vfs_stdquotactl;
  640 vfs_statfs_t            vfs_stdstatfs;
  641 vfs_sync_t              vfs_stdsync;
  642 vfs_sync_t              vfs_stdnosync;
  643 vfs_vget_t              vfs_stdvget;
  644 vfs_fhtovp_t            vfs_stdfhtovp;
  645 vfs_checkexp_t          vfs_stdcheckexp;
  646 vfs_vptofh_t            vfs_stdvptofh;
  647 vfs_init_t              vfs_stdinit;
  648 vfs_uninit_t            vfs_stduninit;
  649 vfs_extattrctl_t        vfs_stdextattrctl;
  650 vfs_sysctl_t            vfs_stdsysctl;
  651 
  652 /* XXX - these should be indirect functions!!! */
  653 int     softdep_fsync(struct vnode *);
  654 int     softdep_process_worklist(struct mount *);
  655 
  656 #else /* !_KERNEL */
  657 
  658 #include <sys/cdefs.h>
  659 
  660 struct stat;
  661 
  662 __BEGIN_DECLS
  663 int     fhopen(const struct fhandle *, int);
  664 int     fhstat(const struct fhandle *, struct stat *);
  665 int     fhstatfs(const struct fhandle *, struct statfs *);
  666 int     fstatfs(int, struct statfs *);
  667 int     getfh(const char *, fhandle_t *);
  668 int     getfsstat(struct statfs *, long, int);
  669 int     getmntinfo(struct statfs **, int);
  670 int     lgetfh(const char *, fhandle_t *);
  671 int     mount(const char *, const char *, int, void *);
  672 int     nmount(struct iovec *, unsigned int, int);
  673 int     statfs(const char *, struct statfs *);
  674 int     unmount(const char *, int);
  675 
  676 /* C library stuff */
  677 int     getvfsbyname(const char *, struct xvfsconf *);
  678 __END_DECLS
  679 
  680 #endif /* _KERNEL */
  681 
  682 #endif /* !_SYS_MOUNT_H_ */

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