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.\"
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.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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.\" DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 21, 2001
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.Dt VFS_GETVFS 9
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.Os
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.Sh NAME
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.Nm vfs_getvfs
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2001-12-14 09:11:13 +00:00
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.Nd "returns a mount point given its filesystem identifier"
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/mount.h
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.Ft "struct mount *"
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.Fn vfs_getvfs "fsid_t *fsid"
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.Sh DESCRIPTION
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The
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.Fn vfs_getvfs
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function returns the mount point structure for a filesystem given its filesystem
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identifier.
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The filesystem ID should have been allocated by calling
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.Xr vfs_getnewfsid 9 ;
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otherwise, it will not be found.
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.Pp
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A major user of
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.Fn vfs_getvfs
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is NFS, which uses the
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.Vt fsid
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as part of file handles in order to determine the
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filesystem a given RPC is for.
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If
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.Fn vfs_getvfs
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fails to find the mount point related to
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.Fa fsid ,
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the filesystem is considered stale.
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.Sh RETURN VALUES
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If
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.Fa fsid
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is found, the mount point for the ID is returned; otherwise,
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.Dv NULL
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is returned.
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.Sh PSEUDOCODE
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.Bd -literal
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if ((mp = vfs_getvfs(&fhp->fh_fsid)) == NULL) {
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error = ESTALE;
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goto out;
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}
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2001-12-03 00:25:04 +00:00
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.Ed
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2001-12-14 09:11:13 +00:00
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.Sh SEE ALSO
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.Xr vfs_getnewfsid 9
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.Sh AUTHORS
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This man page was written by
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.An Chad David Aq davidc@acns.ab.ca .
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