pNFS/flexfiles: Refactor encoding of the layoutreturn payload

Add the layout error payload to the flexfiles layoutreturn private
data, and set up the encoding mechanisms. This is a refactoring in
preparation for adding the layout iostats payload.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/fs/nfs/flexfilelayout/flexfilelayout.h b/fs/nfs/flexfilelayout/flexfilelayout.h
index 09f292e3a4ad..560c837995fc 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.h
+++ b/fs/nfs/flexfilelayout/flexfilelayout.h
@@ -106,6 +106,11 @@ struct nfs4_flexfile_layout {
 	ktime_t			last_report_time; /* Layoutstat report times */
 };
 
+struct nfs4_flexfile_layoutreturn_args {
+	struct list_head errors;
+	unsigned int num_errors;
+};
+
 static inline struct nfs4_flexfile_layout *
 FF_LAYOUT_FROM_HDR(struct pnfs_layout_hdr *lo)
 {
@@ -183,9 +188,12 @@ int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
 			     struct nfs4_ff_layout_mirror *mirror, u64 offset,
 			     u64 length, int status, enum nfs_opnum4 opnum,
 			     gfp_t gfp_flags);
-int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo,
-			      struct xdr_stream *xdr, int *count,
-			      const struct pnfs_layout_range *range);
+int ff_layout_encode_ds_ioerr(struct xdr_stream *xdr, const struct list_head *head);
+void ff_layout_free_ds_ioerr(struct list_head *head);
+unsigned int ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo,
+		const struct pnfs_layout_range *range,
+		struct list_head *head,
+		unsigned int maxnum);
 struct nfs_fh *
 nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx);