NFS: Create a common read and write header struct

The only difference is the write verifier field, but we can keep that
for a little bit longer.
Signed-off-by: NAnna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/internal.h

@@ -395,7 +395,7 @@ extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool
 
 struct nfs_pgio_completion_ops;
 /* read.c */
-extern struct nfs_read_header *nfs_readhdr_alloc(void);
+extern struct nfs_rw_header *nfs_readhdr_alloc(void);
 extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
 			struct inode *inode, bool force_mds,
@@ -424,7 +424,7 @@ int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 			struct inode *inode, int ioflags, bool force_mds,
 			const struct nfs_pgio_completion_ops *compl_ops);
-extern struct nfs_write_header *nfs_writehdr_alloc(void);
+extern struct nfs_rw_header *nfs_writehdr_alloc(void);
 extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
 			     struct nfs_pgio_header *hdr);

fs/nfs/pnfs.c

@@ -1592,7 +1592,7 @@ EXPORT_SYMBOL_GPL(pnfs_writehdr_free);
 int
 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
 {
-	struct nfs_write_header *whdr;
+	struct nfs_rw_header *whdr;
 	struct nfs_pgio_header *hdr;
 	int ret;
 
@@ -1750,7 +1750,7 @@ EXPORT_SYMBOL_GPL(pnfs_readhdr_free);
 int
 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
 {
-	struct nfs_read_header *rhdr;
+	struct nfs_rw_header *rhdr;
 	struct nfs_pgio_header *hdr;
 	int ret;
 

fs/nfs/read.c

@@ -34,9 +34,9 @@ static const struct nfs_pgio_completion_ops nfs_async_read_completion_ops;
 
 static struct kmem_cache *nfs_rdata_cachep;
 
-struct nfs_read_header *nfs_readhdr_alloc(void)
+struct nfs_rw_header *nfs_readhdr_alloc(void)
 {
-	struct nfs_read_header *rhdr;
+	struct nfs_rw_header *rhdr;
 
 	rhdr = kmem_cache_zalloc(nfs_rdata_cachep, GFP_KERNEL);
 	if (rhdr) {
@@ -56,7 +56,7 @@ static struct nfs_pgio_data *nfs_readdata_alloc(struct nfs_pgio_header *hdr,
 {
 	struct nfs_pgio_data *data, *prealloc;
 
-	prealloc = &container_of(hdr, struct nfs_read_header, header)->rpc_data;
+	prealloc = &container_of(hdr, struct nfs_rw_header, header)->rpc_data;
 	if (prealloc->header == NULL)
 		data = prealloc;
 	else
@@ -78,7 +78,7 @@ static struct nfs_pgio_data *nfs_readdata_alloc(struct nfs_pgio_header *hdr,
 
 void nfs_readhdr_free(struct nfs_pgio_header *hdr)
 {
-	struct nfs_read_header *rhdr = container_of(hdr, struct nfs_read_header, header);
+	struct nfs_rw_header *rhdr = container_of(hdr, struct nfs_rw_header, header);
 
 	kmem_cache_free(nfs_rdata_cachep, rhdr);
 }
@@ -87,7 +87,7 @@ EXPORT_SYMBOL_GPL(nfs_readhdr_free);
 void nfs_readdata_release(struct nfs_pgio_data *rdata)
 {
 	struct nfs_pgio_header *hdr = rdata->header;
-	struct nfs_read_header *read_header = container_of(hdr, struct nfs_read_header, header);
+	struct nfs_rw_header *read_header = container_of(hdr, struct nfs_rw_header, header);
 
 	put_nfs_open_context(rdata->args.context);
 	if (rdata->pages.pagevec != rdata->pages.page_array)
@@ -417,7 +417,7 @@ EXPORT_SYMBOL_GPL(nfs_generic_pagein);
 
 static int nfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
 {
-	struct nfs_read_header *rhdr;
+	struct nfs_rw_header *rhdr;
 	struct nfs_pgio_header *hdr;
 	int ret;
 
@@ -680,7 +680,7 @@ int nfs_readpages(struct file *filp, struct address_space *mapping,
 int __init nfs_init_readpagecache(void)
 {
 	nfs_rdata_cachep = kmem_cache_create("nfs_read_data",
-					     sizeof(struct nfs_read_header),
+					     sizeof(struct nfs_rw_header),
 					     0, SLAB_HWCACHE_ALIGN,
 					     NULL);
 	if (nfs_rdata_cachep == NULL)

fs/nfs/write.c

@@ -70,9 +70,9 @@ void nfs_commit_free(struct nfs_commit_data *p)
 }
 EXPORT_SYMBOL_GPL(nfs_commit_free);
 
-struct nfs_write_header *nfs_writehdr_alloc(void)
+struct nfs_rw_header *nfs_writehdr_alloc(void)
 {
-	struct nfs_write_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO);
+	struct nfs_rw_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO);
 
 	if (p) {
 		struct nfs_pgio_header *hdr = &p->header;
@@ -93,7 +93,7 @@ static struct nfs_pgio_data *nfs_writedata_alloc(struct nfs_pgio_header *hdr,
 {
 	struct nfs_pgio_data *data, *prealloc;
 
-	prealloc = &container_of(hdr, struct nfs_write_header, header)->rpc_data;
+	prealloc = &container_of(hdr, struct nfs_rw_header, header)->rpc_data;
 	if (prealloc->header == NULL)
 		data = prealloc;
 	else
@@ -115,7 +115,7 @@ static struct nfs_pgio_data *nfs_writedata_alloc(struct nfs_pgio_header *hdr,
 
 void nfs_writehdr_free(struct nfs_pgio_header *hdr)
 {
-	struct nfs_write_header *whdr = container_of(hdr, struct nfs_write_header, header);
+	struct nfs_rw_header *whdr = container_of(hdr, struct nfs_rw_header, header);
 	mempool_free(whdr, nfs_wdata_mempool);
 }
 EXPORT_SYMBOL_GPL(nfs_writehdr_free);
@@ -123,7 +123,7 @@ EXPORT_SYMBOL_GPL(nfs_writehdr_free);
 void nfs_writedata_release(struct nfs_pgio_data *wdata)
 {
 	struct nfs_pgio_header *hdr = wdata->header;
-	struct nfs_write_header *write_header = container_of(hdr, struct nfs_write_header, header);
+	struct nfs_rw_header *write_header = container_of(hdr, struct nfs_rw_header, header);
 
 	put_nfs_open_context(wdata->args.context);
 	if (wdata->pages.pagevec != wdata->pages.page_array)
@@ -1253,7 +1253,7 @@ EXPORT_SYMBOL_GPL(nfs_generic_flush);
 
 static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
 {
-	struct nfs_write_header *whdr;
+	struct nfs_rw_header *whdr;
 	struct nfs_pgio_header *hdr;
 	int ret;
 
@@ -1910,7 +1910,7 @@ int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
 int __init nfs_init_writepagecache(void)
 {
 	nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
-					     sizeof(struct nfs_write_header),
+					     sizeof(struct nfs_rw_header),
 					     0, SLAB_HWCACHE_ALIGN,
 					     NULL);
 	if (nfs_wdata_cachep == NULL)

include/linux/nfs_xdr.h

@@ -1294,12 +1294,7 @@ struct nfs_pgio_data {
 	struct nfs_client	*ds_clp;	/* pNFS data server */
 };
 
-struct nfs_read_header {
-	struct nfs_pgio_header	header;
-	struct nfs_pgio_data	rpc_data;
-};
-
-struct nfs_write_header {
+struct nfs_rw_header {
 	struct nfs_pgio_header	header;
 	struct nfs_pgio_data	rpc_data;
 	struct nfs_writeverf	verf;