NFS: create completion structure to pass into page_init functions

Factors out the code that will need to change when directio
starts using these code paths.  This will allow directio to use
the generic pagein and flush routines

Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 22 insertions, 14 deletions

diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index c9633b2..5e78af1 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -31,6 +31,7 @@
 
 static const struct nfs_pageio_ops nfs_pageio_read_ops;
 static const struct rpc_call_ops nfs_read_common_ops;
+static const struct nfs_pgio_completion_ops nfs_async_read_completion_ops;
 
 static struct kmem_cache *nfs_rdata_cachep;
 
@@ -95,7 +96,7 @@ void nfs_readdata_release(struct nfs_read_data *rdata)
 	else
 		rdata->header = NULL;
 	if (atomic_dec_and_test(&hdr->refcnt))
-		nfs_read_completion(hdr);
+		hdr->completion_ops->completion(hdr);
 }
 
 static
@@ -108,9 +109,10 @@ int nfs_return_empty_page(struct page *page)
 }
 
 void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
-		struct inode *inode)
+			      struct inode *inode,
+			      const struct nfs_pgio_completion_ops *compl_ops)
 {
-	nfs_pageio_init(pgio, inode, &nfs_pageio_read_ops,
+	nfs_pageio_init(pgio, inode, &nfs_pageio_read_ops, compl_ops,
 			NFS_SERVER(inode)->rsize, 0);
 }
 
@@ -122,10 +124,11 @@ void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio)
 EXPORT_SYMBOL_GPL(nfs_pageio_reset_read_mds);
 
 static void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
-		struct inode *inode)
+				struct inode *inode,
+				const struct nfs_pgio_completion_ops *compl_ops)
 {
-	if (!pnfs_pageio_init_read(pgio, inode))
-		nfs_pageio_init_read_mds(pgio, inode);
+	if (!pnfs_pageio_init_read(pgio, inode, compl_ops))
+		nfs_pageio_init_read_mds(pgio, inode, compl_ops);
 }
 
 int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
@@ -146,7 +149,7 @@ int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
 	if (len < PAGE_CACHE_SIZE)
 		zero_user_segment(page, len, PAGE_CACHE_SIZE);
 
-	nfs_pageio_init_read(&pgio, inode);
+	nfs_pageio_init_read(&pgio, inode, &nfs_async_read_completion_ops);
 	nfs_pageio_add_request(&pgio, new);
 	nfs_pageio_complete(&pgio);
 	return 0;
@@ -170,7 +173,7 @@ static void nfs_readpage_release(struct nfs_page *req)
 }
 
 /* Note io was page aligned */
-void nfs_read_completion(struct nfs_pgio_header *hdr)
+static void nfs_read_completion(struct nfs_pgio_header *hdr)
 {
 	unsigned long bytes = 0;
 
@@ -300,7 +303,7 @@ nfs_do_multiple_reads(struct list_head *head,
 	return ret;
 }
 
-void
+static void
 nfs_async_read_error(struct list_head *head)
 {
 	struct nfs_page	*req;
@@ -312,6 +315,11 @@ nfs_async_read_error(struct list_head *head)
 	}
 }
 
+static const struct nfs_pgio_completion_ops nfs_async_read_completion_ops = {
+	.error_cleanup = nfs_async_read_error,
+	.completion = nfs_read_completion,
+};
+
 /*
  * Generate multiple requests to fill a single page.
  *
@@ -362,7 +370,7 @@ out_bad:
 		list_del(&data->list);
 		nfs_readdata_release(data);
 	}
-	nfs_async_read_error(&hdr->pages);
+	desc->pg_completion_ops->error_cleanup(&hdr->pages);
 	return -ENOMEM;
 }
 
@@ -378,7 +386,7 @@ static int nfs_pagein_one(struct nfs_pageio_descriptor *desc,
 	data = nfs_readdata_alloc(hdr, nfs_page_array_len(desc->pg_base,
 							  desc->pg_count));
 	if (!data) {
-		nfs_async_read_error(head);
+		desc->pg_completion_ops->error_cleanup(head);
 		ret = -ENOMEM;
 		goto out;
 	}
@@ -414,7 +422,7 @@ static int nfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
 
 	rhdr = nfs_readhdr_alloc();
 	if (!rhdr) {
-		nfs_async_read_error(&desc->pg_list);
+		desc->pg_completion_ops->error_cleanup(&desc->pg_list);
 		return -ENOMEM;
 	}
 	hdr = &rhdr->header;
@@ -427,7 +435,7 @@ static int nfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
 	else
 		set_bit(NFS_IOHDR_REDO, &hdr->flags);
 	if (atomic_dec_and_test(&hdr->refcnt))
-		nfs_read_completion(hdr);
+		hdr->completion_ops->completion(hdr);
 	return ret;
 }
 
@@ -652,7 +660,7 @@ int nfs_readpages(struct file *filp, struct address_space *mapping,
 	if (ret == 0)
 		goto read_complete; /* all pages were read */
 
-	nfs_pageio_init_read(&pgio, inode);
+	nfs_pageio_init_read(&pgio, inode, &nfs_async_read_completion_ops);
 
 	ret = read_cache_pages(mapping, pages, readpage_async_filler, &desc);