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

NAME
     VFS_CHECKEXP -- check if a	file system is exported	to a client

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

     int
     VFS_CHECKEXP(struct mount *mp, struct sockaddr *nam, uint64_t *exflagsp,
	 struct	ucred **credanonp, int *numsecflavor, int *secflavors);

DESCRIPTION
     The VFS_CHECKEXP()	macro is used by the NFS server	to check if a mount
     point is exported to a client.

     The arguments it expects are:

     mp		    The	mount point to be checked.

     nam	    An mbuf containing the network address of the client.

     exflagsp	    Return parameter for the export flags for this client.

     credanonp	    Return parameter for the anonymous credentials for this
		    client.

     numsecflavors  Return value for the number	of security flavors for	this
		    client.

     secflavors	    Must be an array of	size MAXSECFLAVORS, in which the secu-
		    rity flavors for this client are returned.

     The VFS_CHECKEXP()	macro should be	called on a file system's mount	struc-
     ture to determine if it is	exported to a client whose address is con-
     tained in nam.

     It	is called in the NFS server once a vnode for a file handle has been
     acquired, in order	to determine what access the client is allowed on the
     file system the vnode resides in.	For NFSv4, it is also called whenever
     the lookup	operation crosses a server file	system mount point, to update
     the access	information.

     The operation is file system specific, but	is normally handled by the de-
     fault ``vfs_stdcheckexp''.

RETURN VALUES
     The export	flags, anonymous credentials and security flavors specific to
     the client	will be	returned in *exflagsp, *credanonp, *numsecflavors and
     *secflavors.

SEE ALSO
     VFS(9), VFS_FHTOVP(9), vnode(9), VOP_VPTOFH(9)

AUTHORS
     This manual page was written by Alfred Perlstein.

BSD				 June 17, 2020				   BSD

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | AUTHORS

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