NFS: Create a common pgio_error function

At this point, the read and write versions of this function look
identical so both should use the same function.
Signed-off-by: NAnna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/internal.h

@@ -242,6 +242,7 @@ struct nfs_rw_header *nfs_rw_header_alloc(const struct nfs_rw_ops *);
 void nfs_rw_header_free(struct nfs_pgio_header *);
 struct nfs_pgio_data *nfs_pgio_data_alloc(struct nfs_pgio_header *, unsigned int);
 void nfs_pgio_data_release(struct nfs_pgio_data *);
+int nfs_pgio_error(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
 void nfs_pgio_rpcsetup(struct nfs_pgio_data *, unsigned int, unsigned int, int,
 		       struct nfs_commit_info *);
 

fs/nfs/pagelist.c

@@ -446,6 +446,26 @@ static void nfs_pgio_prepare(struct rpc_task *task, void *calldata)
 		rpc_exit(task, err);
 }
 
+/**
+ * nfs_pgio_error - Clean up from a pageio error
+ * @desc: IO descriptor
+ * @hdr: pageio header
+ */
+int nfs_pgio_error(struct nfs_pageio_descriptor *desc,
+			  struct nfs_pgio_header *hdr)
+{
+	struct nfs_pgio_data *data;
+
+	set_bit(NFS_IOHDR_REDO, &hdr->flags);
+	while (!list_empty(&hdr->rpc_list)) {
+		data = list_first_entry(&hdr->rpc_list, struct nfs_pgio_data, list);
+		list_del(&data->list);
+		nfs_pgio_data_release(data);
+	}
+	desc->pg_completion_ops->error_cleanup(&desc->pg_list);
+	return -ENOMEM;
+}
+
 /**
  * nfs_pgio_release - Release pageio data
  * @calldata: The pageio data to release

fs/nfs/read.c

@@ -237,19 +237,6 @@ static const struct nfs_pgio_completion_ops nfs_async_read_completion_ops = {
 	.completion = nfs_read_completion,
 };
 
-static void nfs_pagein_error(struct nfs_pageio_descriptor *desc,
-		struct nfs_pgio_header *hdr)
-{
-	set_bit(NFS_IOHDR_REDO, &hdr->flags);
-	while (!list_empty(&hdr->rpc_list)) {
-		struct nfs_pgio_data *data = list_first_entry(&hdr->rpc_list,
-				struct nfs_pgio_data, list);
-		list_del(&data->list);
-		nfs_pgio_data_release(data);
-	}
-	desc->pg_completion_ops->error_cleanup(&desc->pg_list);
-}
-
 /*
  * Generate multiple requests to fill a single page.
  *
@@ -278,10 +265,8 @@ static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc,
 		size_t len = min(nbytes,rsize);
 
 		data = nfs_pgio_data_alloc(hdr, 1);
-		if (!data) {
-			nfs_pagein_error(desc, hdr);
-			return -ENOMEM;
-		}
+		if (!data)
+			return nfs_pgio_error(desc, hdr);
 		data->pages.pagevec[0] = page;
 		nfs_pgio_rpcsetup(data, len, offset, 0, NULL);
 		list_add(&data->list, &hdr->rpc_list);
@@ -305,10 +290,8 @@ static int nfs_pagein_one(struct nfs_pageio_descriptor *desc,
 
 	data = nfs_pgio_data_alloc(hdr, nfs_page_array_len(desc->pg_base,
 							  desc->pg_count));
-	if (!data) {
-		nfs_pagein_error(desc, hdr);
-		return -ENOMEM;
-	}
+	if (!data)
+		return nfs_pgio_error(desc, hdr);
 
 	pages = data->pages.pagevec;
 	while (!list_empty(head)) {

fs/nfs/write.c

@@ -1044,19 +1044,6 @@ static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = {
 	.completion = nfs_write_completion,
 };
 
-static void nfs_flush_error(struct nfs_pageio_descriptor *desc,
-		struct nfs_pgio_header *hdr)
-{
-	set_bit(NFS_IOHDR_REDO, &hdr->flags);
-	while (!list_empty(&hdr->rpc_list)) {
-		struct nfs_pgio_data *data = list_first_entry(&hdr->rpc_list,
-				struct nfs_pgio_data, list);
-		list_del(&data->list);
-		nfs_pgio_data_release(data);
-	}
-	desc->pg_completion_ops->error_cleanup(&desc->pg_list);
-}
-
 /*
  * Generate multiple small requests to write out a single
  * contiguous dirty area on one page.
@@ -1086,10 +1073,8 @@ static int nfs_flush_multi(struct nfs_pageio_descriptor *desc,
 		size_t len = min(nbytes, wsize);
 
 		data = nfs_pgio_data_alloc(hdr, 1);
-		if (!data) {
-			nfs_flush_error(desc, hdr);
-			return -ENOMEM;
-		}
+		if (!data)
+			return nfs_pgio_error(desc, hdr);
 		data->pages.pagevec[0] = page;
 		nfs_pgio_rpcsetup(data, len, offset, desc->pg_ioflags, &cinfo);
 		list_add(&data->list, &hdr->rpc_list);
@@ -1122,10 +1107,8 @@ static int nfs_flush_one(struct nfs_pageio_descriptor *desc,
 
 	data = nfs_pgio_data_alloc(hdr, nfs_page_array_len(desc->pg_base,
 							   desc->pg_count));
-	if (!data) {
-		nfs_flush_error(desc, hdr);
-		return -ENOMEM;
-	}
+	if (!data)
+		return nfs_pgio_error(desc, hdr);
 
 	nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
 	pages = data->pages.pagevec;