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The nfs_ssc.h header contains both client- and server-side data
structures, which means each of those implementations has to pull in
headers from the other.
Create a linux/nfsd_ssc.h for the server side APIs which no longer
includes uapi/linux/nfs.h either directly or indirectly. Because
nfsd_ssc.h drops the transitive include of the NFS client headers,
fs/nfsd/nfs4proc.c now includes <linux/pagemap.h> directly for
filemap_check_wb_err().
struct nfsd4_ssc_umount_item is private to nfsd. Move it into
fs/nfsd/xdr4.h alongside its only consumers rather than into the
exported nfsd_ssc.h.
As an added clean-up, add missing header guard macros and the
struct file and struct vfsmount forward declarations the server
prototypes need.
Cc: Olga Kornievskaia <okorniev@redhat.com>
Cc: Dai Ngo <dai.ngo@oracle.com>
Link: https://patch.msgid.link/20260721162306.894558-5-cel@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>
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