NFS: Clean up - simplify the switch to read/write-through-MDS

Use nfs_pageio_reset_read_mds and nfs_pageio_reset_write_mds instead of
completely reinitialising the struct nfs_pageio_descriptor.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/internal.h

@@ -299,16 +299,12 @@ extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
 		struct list_head *head);
 
-extern void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
-		struct inode *inode);
 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
 extern void nfs_readdata_release(struct nfs_read_data *rdata);
 
 /* write.c */
 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
 		struct list_head *head);
-extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
-				  struct inode *inode, int ioflags);
 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
 extern void nfs_writedata_release(struct nfs_write_data *wdata);
 extern void nfs_commit_free(struct nfs_write_data *p);

fs/nfs/nfs4filelayout.c

@@ -711,7 +711,7 @@ filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio,
 					   GFP_KERNEL);
 	/* If no lseg, fall back to read through mds */
 	if (pgio->pg_lseg == NULL)
-		nfs_pageio_init_read_mds(pgio, pgio->pg_inode);
+		nfs_pageio_reset_read_mds(pgio);
 }
 
 void
@@ -728,8 +728,7 @@ filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio,
 					   GFP_NOFS);
 	/* If no lseg, fall back to write through mds */
 	if (pgio->pg_lseg == NULL)
-		nfs_pageio_init_write_mds(pgio, pgio->pg_inode,
-					  pgio->pg_ioflags);
+		nfs_pageio_reset_write_mds(pgio);
 }
 
 static const struct nfs_pageio_ops filelayout_pg_read_ops = {

fs/nfs/pnfs.c

@@ -1075,7 +1075,7 @@ pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *r
 					   GFP_KERNEL);
 	/* If no lseg, fall back to read through mds */
 	if (pgio->pg_lseg == NULL)
-		nfs_pageio_init_read_mds(pgio, pgio->pg_inode);
+		nfs_pageio_reset_read_mds(pgio);
 
 }
 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read);
@@ -1093,7 +1093,7 @@ pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *
 					   GFP_NOFS);
 	/* If no lseg, fall back to write through mds */
 	if (pgio->pg_lseg == NULL)
-		nfs_pageio_init_write_mds(pgio, pgio->pg_inode, pgio->pg_ioflags);
+		nfs_pageio_reset_write_mds(pgio);
 }
 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write);
 

fs/nfs/read.c

@@ -112,19 +112,19 @@ static void nfs_readpage_truncate_uninitialised_page(struct nfs_read_data *data)
 	}
 }
 
-void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
+static void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
 		struct inode *inode)
 {
 	nfs_pageio_init(pgio, inode, &nfs_pageio_read_ops,
 			NFS_SERVER(inode)->rsize, 0);
 }
-EXPORT_SYMBOL_GPL(nfs_pageio_init_read_mds);
 
 void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio)
 {
 	pgio->pg_ops = &nfs_pageio_read_ops;
 	pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->rsize;
 }
+EXPORT_SYMBOL_GPL(nfs_pageio_reset_read_mds);
 
 static void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
 		struct inode *inode)

fs/nfs/write.c

@@ -1051,19 +1051,19 @@ static const struct nfs_pageio_ops nfs_pageio_write_ops = {
 	.pg_doio = nfs_generic_pg_writepages,
 };
 
-void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
+static void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
 				  struct inode *inode, int ioflags)
 {
 	nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops,
 				NFS_SERVER(inode)->wsize, ioflags);
 }
-EXPORT_SYMBOL_GPL(nfs_pageio_init_write_mds);
 
 void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
 {
 	pgio->pg_ops = &nfs_pageio_write_ops;
 	pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize;
 }
+EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds);
 
 static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 				  struct inode *inode, int ioflags)