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, int *exflagsp, struct ucred **credanonp);

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.

       The  VFS_CHECKEXP()  macro  should  be  called  on  a file system's mount structure to determine if it is
       exported to a client whose address is contained in nam.

       It is generally called before VFS_FHTOVP(9) to validate that a client has access to the file system.

       The file system should call vfs_export_lookup(9) with the address of an appropriate  netexport  structure
       and the address of the client, nam, to verify that the client can access this file system.

RETURN VALUES

       The export flags and anonymous credentials specific to the client (returned by vfs_export_lookup(9)) will
       be returned in *exflagsp and *credanonp.

SEE ALSO

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

AUTHORS

       This manual page was written by Alfred Perlstein.

Debian                                           January 4, 2010                                 VFS_CHECKEXP(9)