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NetBSD 6.1.5 - man page for vfs_export_lookup (netbsd section 9)

VFSSUBR(9)			  BSD Kernel Developer's Manual 		       VFSSUBR(9)

NAME
     vfssubr, vfs_getnewfsid, vfs_getvfs, vfs_export, vfs_showexport, vfs_export_lookup,
     vfs_setpublicfs, vfs_mountedon, vfs_mountroot, vfs_unmountall, vfs_busy, vfs_unbusy,
     vfs_mountalloc, vfs_rootmountalloc, vfs_shutdown, vfs_attach, vfs_detach, vfs_reinit,
     vfs_getopsbyname, vfs_suspend, vfs_resume -- high-level interface to kernel file system
     interface

SYNOPSIS
     #include <sys/param.h>
     #include <sys/mount.h>
     #include <sys/vnode.h>

     void
     vfs_getnewfsid(struct mount *mp);

     struct mount *
     vfs_getvfs(fsid_t *fsid);

     int
     vfs_export_lookup(struct mount *mp, struct netexport *nep, struct export_args *argp);

     int
     vfs_setpublicfs(struct mount *mp, struct netexport *nep, struct export_args *argp);

     int
     vfs_mountedon(struct vnode *vp);

     int
     vfs_mountroot(void);

     void
     vfs_unmountall(struct lwp *l);

     int
     vfs_busy(struct mount *mp, int flags, struct simplelock *interlkp);

     void
     vfs_unbusy(struct mount *mp);

     struct mount *
     vfs_mountalloc(struct vfsops *vfs, struct vnode *vp);

     int
     vfs_rootmountalloc(char *fstypename, char *devname, struct mount **mpp);

     void
     vfs_shutdown(void);

     int
     vfs_attach(struct vfsops *vfs);

     int
     vfs_detach(struct vfsops *vfs);

     void
     vfs_reinit(void);

     struct vfsops *
     vfs_getopsbyname(const char *name);

     int
     vfs_suspend(struct mount *mp, int nowait);

     void
     vfs_resume(struct mount *mp);

DESCRIPTION
     The high-level functions described in this page are the interface to the kernel file system
     interface (VFS).

FUNCTIONS
     vfs_getnewfsid(mp)
	      Get a new unique file system id type for the file system specified by the mount
	      structure mp.  The file system id type is stored in mp->mnt_stat.f_fsidx.

     vfs_getvfs(fsid)
	      Lookup a mount point with the file system identifier fsid.

     vfs_export_lookup(mp, nep, argp)
	      Check client permission on the exportable file system specified by the mount struc-
	      ture mp.	The argument nam is the address of the networked client.  This function
	      is used by file system type specific functions to verify that the client can access
	      the file system.

     vfs_setpublicfs(mp, nep, argp)
	      Set the publicly exported file system specified by the mount structure mp.

     vfs_mountedon(vp)
	      Check to see if a file system is mounted on a block device specified by the vnode
	      vp.

     vfs_mountroot(void)
	      Mount the root file system.

     vfs_unmountall(l)
	      Unmount all file systems.

     vfs_busy(mp, flags, interlkp)
	      Mark the mount point specified by mp as busy.  This function is used to synchronize
	      access and to delay unmounting.  The interlock specified by argument interlkp is
	      not released on failure.

     vfs_unbusy(mp)
	      Free the busy file system specified by the mount structure mp.

     vfs_mountalloc(vfsops, vp)
	      Allocate and initialise a mount structure, setting mnt_vnodecovered to vp and
	      mnt_op to vfsops.  On success, mark the mount structure as busy and return its
	      address.	Otherwise, return NULL.

     vfs_rootmountalloc(fstypename, devname, mpp)
	      Lookup a file system type specified by the name fstypename and if found allocate
	      and initialise a mount structure for it.	The allocated mount structure is returned
	      in the address specified by mpp.	The device the root file system was mounted from
	      is specified by the argument devname and is recorded in the new mount structure.

     vfs_shutdown()
	      Sync and unmount all file systems before shutting down.  Invoked by cpu_reboot(9).

     vfs_attach(vfs)
	      Establish file system vfs and initialise it.

     vfs_detach(vfs)
	      Remove file system vfs from the kernel.

     vfs_reinit(void)
	      Reinitialises all file systems within the kernel through file system-specific vfs
	      operation (see vfsops(9)).

     vfs_getopsbyname(name)
	      Given a file system name specified by name, look up the vfs operations for that
	      file system (see vfsops(9)), or return NULL if file system isn't present in the
	      kernel.

     vfs_suspend(mp, nowait)
	      Request a mounted file system to suspend all operations.	All new operations to the
	      file system are stopped.	After all operations in progress have completed, the file
	      system is synced to disk and the function returns.  If a file system suspension is
	      currently in progress and nowait is set EWOULDBLOCK is returned.	If the operation
	      is successful, zero is returned, otherwise an appropriate error code is returned.

     vfs_resume(mp)
	      Request a mounted file system to resume operations.

CODE REFERENCES
     The vfs interface functions are implemented within the files sys/kern/vfs_subr.c and
     sys/kern/vfs_init.c.

SEE ALSO
     intro(9), namei(9), vfs(9), vfsops(9), vnode(9), vnodeops(9)

BSD					   May 9, 2009					      BSD


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