Hi Alex, Thanks for the patch! On Wed, Jun 2, 2021 at 8:26 AM Alex <zgxgoo@xxxxxxxxx> wrote: > > Add the missing declaration in head file fs/nfs/nfs4_fs.h to fix this. It looks like the declarations are already in the file linux/nfs_ssc.h, which is included by nfs4file.c but they're only there if CONFIG_NFSD_V4_2_INTER_SSC=y (I'm guessing you compiled with this set to 'n'). A better solution is probably to define a #else condition with empty functions for the case when CONFIG_NFSD_V4_2_INTER_SSC=n. I hope this helps! Anna > > Signed-off-by: Alex <zgxgoo@xxxxxxxxx> > --- > fs/nfs/nfs4_fs.h | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h > index 0c9505dc852c..0cb79afa0a63 100644 > --- a/fs/nfs/nfs4_fs.h > +++ b/fs/nfs/nfs4_fs.h > @@ -656,4 +656,10 @@ static inline void nfs4_xattr_cache_zap(struct inode *inode) > > > #endif /* CONFIG_NFS_V4 */ > + > +/* nfs4file.c */ > +#ifdef CONFIG_NFS_V4_2 > +struct file *nfs42_ssc_open(struct vfsmount *ss_mnt, struct nfs_fh *src_fh, nfs4_stateid *stateid); > +void nfs42_ssc_close(struct file *filep); > +#endif > #endif /* __LINUX_FS_NFS_NFS4_FS.H */ > -- > 2.25.1 >