pnfs: encode_layoutreturn

Add a layout driver method to encode the layout type specific opaque part of layout return in-line in the xdr stream. Currently the pnfs-objects layout driver uses it to encode i/o error information on LAYOUTRETURN. Signed-off-by: Andy Adamson <[email protected]> [fixup layout header pointer for encode_layoutreturn] Signed-off-by: Benny Halevy <[email protected]>
RyanHsu · May 29, 2011 · 04a5554 · 04a5554
1 parent 8a1636c
commit 04a5554
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Showing 2 changed files with 11 additions and 2 deletions.
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
@@ -1920,8 +1920,13 @@ encode_layoutreturn(struct xdr_stream *xdr,
 	spin_lock(&args->inode->i_lock);
 	xdr_encode_opaque_fixed(p, &args->stateid.data, NFS4_STATEID_SIZE);
 	spin_unlock(&args->inode->i_lock);
-	p = reserve_space(xdr, 4);
-	*p = cpu_to_be32(0);
+	if (NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn) {
+		NFS_SERVER(args->inode)->pnfs_curr_ld->encode_layoutreturn(
+			NFS_I(args->inode)->layout, xdr, args);
+	} else {
+		p = reserve_space(xdr, 4);
+		*p = cpu_to_be32(0);
+	}
 	hdr->nops++;
 	hdr->replen += decode_layoutreturn_maxsz;
 }

diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
@@ -104,6 +104,10 @@ struct pnfs_layoutdriver_type {
 	enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
 
 	void (*free_deviceid_node) (struct nfs4_deviceid_node *);
+
+	void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
+				     struct xdr_stream *xdr,
+				     const struct nfs4_layoutreturn_args *args);
 };
 
 struct pnfs_layout_hdr {