NFS: Create a common pgio_alloc and pgio_release function

These functions are identical for the read and write paths so they can
be combined.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

5 files changed, 74 insertions, 106 deletions

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index b0e7a41..5ddc142 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -231,13 +231,15 @@ extern void nfs_destroy_writepagecache(void);
 
 extern int __init nfs_init_directcache(void);
 extern void nfs_destroy_directcache(void);
-extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
 			      struct nfs_pgio_header *hdr,
 			      void (*release)(struct nfs_pgio_header *hdr));
 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
 int nfs_iocounter_wait(struct nfs_io_counter *c);
 
+struct nfs_pgio_data *nfs_pgio_data_alloc(struct nfs_pgio_header *, unsigned int);
+void nfs_pgio_data_release(struct nfs_pgio_data *);
+
 static inline void nfs_iocounter_init(struct nfs_io_counter *c)
 {
 	c->flags = 0;
@@ -407,7 +409,6 @@ extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
 			      struct nfs_pgio_header *hdr);
 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
-extern void nfs_readdata_release(struct nfs_pgio_data *rdata);
 
 /* super.c */
 void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
@@ -429,7 +430,6 @@ 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);
 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
-extern void nfs_writedata_release(struct nfs_pgio_data *wdata);
 extern void nfs_commit_free(struct nfs_commit_data *p);
 extern int nfs_initiate_write(struct rpc_clnt *clnt,
 			      struct nfs_pgio_data *data,
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 2ffebf2..a98ccf7 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -26,7 +26,7 @@
 
 static struct kmem_cache *nfs_page_cachep;
 
-bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount)
+static bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount)
 {
 	p->npages = pagecount;
 	if (pagecount <= ARRAY_SIZE(p->page_array))
@@ -295,6 +295,66 @@ bool nfs_generic_pg_test(struct nfs_pageio_descriptor *desc, struct nfs_page *pr
 }
 EXPORT_SYMBOL_GPL(nfs_generic_pg_test);
 
+static inline struct nfs_rw_header *NFS_RW_HEADER(struct nfs_pgio_header *hdr)
+{
+	return container_of(hdr, struct nfs_rw_header, header);
+}
+
+/**
+ * nfs_pgio_data_alloc - Allocate pageio data
+ * @hdr: The header making a request
+ * @pagecount: Number of pages to create
+ */
+struct nfs_pgio_data *nfs_pgio_data_alloc(struct nfs_pgio_header *hdr,
+					  unsigned int pagecount)
+{
+	struct nfs_pgio_data *data, *prealloc;
+
+	prealloc = &NFS_RW_HEADER(hdr)->rpc_data;
+	if (prealloc->header == NULL)
+		data = prealloc;
+	else
+		data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		goto out;
+
+	if (nfs_pgarray_set(&data->pages, pagecount)) {
+		data->header = hdr;
+		atomic_inc(&hdr->refcnt);
+	} else {
+		if (data != prealloc)
+			kfree(data);
+		data = NULL;
+	}
+out:
+	return data;
+}
+
+/**
+ * nfs_pgio_data_release - Properly free pageio data
+ * @data: The data to release
+ */
+void nfs_pgio_data_release(struct nfs_pgio_data *data)
+{
+	struct nfs_pgio_header *hdr = data->header;
+	struct nfs_rw_header *pageio_header = NFS_RW_HEADER(hdr);
+
+	put_nfs_open_context(data->args.context);
+	if (data->pages.pagevec != data->pages.page_array)
+		kfree(data->pages.pagevec);
+	if (data == &pageio_header->rpc_data) {
+		data->header = NULL;
+		data = NULL;
+	}
+	if (atomic_dec_and_test(&hdr->refcnt))
+		hdr->completion_ops->completion(hdr);
+	/* Note: we only free the rpc_task after callbacks are done.
+	 * See the comment in rpc_free_task() for why
+	 */
+	kfree(data);
+}
+EXPORT_SYMBOL_GPL(nfs_pgio_data_release);
+
 /**
  * nfs_pageio_init - initialise a page io descriptor
  * @desc: pointer to descriptor
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 43cfe11..e192ba6 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1536,7 +1536,7 @@ pnfs_write_through_mds(struct nfs_pageio_descriptor *desc,
 		nfs_pageio_reset_write_mds(desc);
 		desc->pg_recoalesce = 1;
 	}
-	nfs_writedata_release(data);
+	nfs_pgio_data_release(data);
 }
 
 static enum pnfs_try_status
@@ -1691,7 +1691,7 @@ pnfs_read_through_mds(struct nfs_pageio_descriptor *desc,
 		nfs_pageio_reset_read_mds(desc);
 		desc->pg_recoalesce = 1;
 	}
-	nfs_readdata_release(data);
+	nfs_pgio_data_release(data);
 }
 
 /*
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index d29ca36..ab4c1a5 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -51,31 +51,6 @@ struct nfs_rw_header *nfs_readhdr_alloc(void)
 }
 EXPORT_SYMBOL_GPL(nfs_readhdr_alloc);
 
-static struct nfs_pgio_data *nfs_readdata_alloc(struct nfs_pgio_header *hdr,
-						unsigned int pagecount)
-{
-	struct nfs_pgio_data *data, *prealloc;
-
-	prealloc = &container_of(hdr, struct nfs_rw_header, header)->rpc_data;
-	if (prealloc->header == NULL)
-		data = prealloc;
-	else
-		data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (!data)
-		goto out;
-
-	if (nfs_pgarray_set(&data->pages, pagecount)) {
-		data->header = hdr;
-		atomic_inc(&hdr->refcnt);
-	} else {
-		if (data != prealloc)
-			kfree(data);
-		data = NULL;
-	}
-out:
-	return data;
-}
-
 void nfs_readhdr_free(struct nfs_pgio_header *hdr)
 {
 	struct nfs_rw_header *rhdr = container_of(hdr, struct nfs_rw_header, header);
@@ -84,27 +59,6 @@ void nfs_readhdr_free(struct nfs_pgio_header *hdr)
 }
 EXPORT_SYMBOL_GPL(nfs_readhdr_free);
 
-void nfs_readdata_release(struct nfs_pgio_data *rdata)
-{
-	struct nfs_pgio_header *hdr = rdata->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)
-		kfree(rdata->pages.pagevec);
-	if (rdata == &read_header->rpc_data) {
-		rdata->header = NULL;
-		rdata = NULL;
-	}
-	if (atomic_dec_and_test(&hdr->refcnt))
-		hdr->completion_ops->completion(hdr);
-	/* Note: we only free the rpc_task after callbacks are done.
-	 * See the comment in rpc_free_task() for why
-	 */
-	kfree(rdata);
-}
-EXPORT_SYMBOL_GPL(nfs_readdata_release);
-
 static
 int nfs_return_empty_page(struct page *page)
 {
@@ -327,7 +281,7 @@ static void nfs_pagein_error(struct nfs_pageio_descriptor *desc,
 		struct nfs_pgio_data *data = list_first_entry(&hdr->rpc_list,
 				struct nfs_pgio_data, list);
 		list_del(&data->list);
-		nfs_readdata_release(data);
+		nfs_pgio_data_release(data);
 	}
 	desc->pg_completion_ops->error_cleanup(&desc->pg_list);
 }
@@ -359,7 +313,7 @@ static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc,
 	do {
 		size_t len = min(nbytes,rsize);
 
-		data = nfs_readdata_alloc(hdr, 1);
+		data = nfs_pgio_data_alloc(hdr, 1);
 		if (!data) {
 			nfs_pagein_error(desc, hdr);
 			return -ENOMEM;
@@ -385,7 +339,7 @@ static int nfs_pagein_one(struct nfs_pageio_descriptor *desc,
 	struct nfs_pgio_data	*data;
 	struct list_head *head = &desc->pg_list;
 
-	data = nfs_readdata_alloc(hdr, nfs_page_array_len(desc->pg_base,
+	data = nfs_pgio_data_alloc(hdr, nfs_page_array_len(desc->pg_base,
 							  desc->pg_count));
 	if (!data) {
 		nfs_pagein_error(desc, hdr);
@@ -515,7 +469,7 @@ static void nfs_readpage_result_common(struct rpc_task *task, void *calldata)
 
 static void nfs_readpage_release_common(void *calldata)
 {
-	nfs_readdata_release(calldata);
+	nfs_pgio_data_release(calldata);
 }
 
 void nfs_read_prepare(struct rpc_task *task, void *calldata)
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 321a791..0dc4d6a 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -87,31 +87,6 @@ struct nfs_rw_header *nfs_writehdr_alloc(void)
 }
 EXPORT_SYMBOL_GPL(nfs_writehdr_alloc);
 
-static struct nfs_pgio_data *nfs_writedata_alloc(struct nfs_pgio_header *hdr,
-						  unsigned int pagecount)
-{
-	struct nfs_pgio_data *data, *prealloc;
-
-	prealloc = &container_of(hdr, struct nfs_rw_header, header)->rpc_data;
-	if (prealloc->header == NULL)
-		data = prealloc;
-	else
-		data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (!data)
-		goto out;
-
-	if (nfs_pgarray_set(&data->pages, pagecount)) {
-		data->header = hdr;
-		atomic_inc(&hdr->refcnt);
-	} else {
-		if (data != prealloc)
-			kfree(data);
-		data = NULL;
-	}
-out:
-	return data;
-}
-
 void nfs_writehdr_free(struct nfs_pgio_header *hdr)
 {
 	struct nfs_rw_header *whdr = container_of(hdr, struct nfs_rw_header, header);
@@ -119,27 +94,6 @@ void nfs_writehdr_free(struct nfs_pgio_header *hdr)
 }
 EXPORT_SYMBOL_GPL(nfs_writehdr_free);
 
-void nfs_writedata_release(struct nfs_pgio_data *wdata)
-{
-	struct nfs_pgio_header *hdr = wdata->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)
-		kfree(wdata->pages.pagevec);
-	if (wdata == &write_header->rpc_data) {
-		wdata->header = NULL;
-		wdata = NULL;
-	}
-	if (atomic_dec_and_test(&hdr->refcnt))
-		hdr->completion_ops->completion(hdr);
-	/* Note: we only free the rpc_task after callbacks are done.
-	 * See the comment in rpc_free_task() for why
-	 */
-	kfree(wdata);
-}
-EXPORT_SYMBOL_GPL(nfs_writedata_release);
-
 static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
 {
 	ctx->error = error;
@@ -1146,7 +1100,7 @@ static void nfs_flush_error(struct nfs_pageio_descriptor *desc,
 		struct nfs_pgio_data *data = list_first_entry(&hdr->rpc_list,
 				struct nfs_pgio_data, list);
 		list_del(&data->list);
-		nfs_writedata_release(data);
+		nfs_pgio_data_release(data);
 	}
 	desc->pg_completion_ops->error_cleanup(&desc->pg_list);
 }
@@ -1179,7 +1133,7 @@ static int nfs_flush_multi(struct nfs_pageio_descriptor *desc,
 	do {
 		size_t len = min(nbytes, wsize);
 
-		data = nfs_writedata_alloc(hdr, 1);
+		data = nfs_pgio_data_alloc(hdr, 1);
 		if (!data) {
 			nfs_flush_error(desc, hdr);
 			return -ENOMEM;
@@ -1214,7 +1168,7 @@ static int nfs_flush_one(struct nfs_pageio_descriptor *desc,
 	struct list_head *head = &desc->pg_list;
 	struct nfs_commit_info cinfo;
 
-	data = nfs_writedata_alloc(hdr, nfs_page_array_len(desc->pg_base,
+	data = nfs_pgio_data_alloc(hdr, nfs_page_array_len(desc->pg_base,
 							   desc->pg_count));
 	if (!data) {
 		nfs_flush_error(desc, hdr);
@@ -1348,7 +1302,7 @@ static void nfs_writeback_release_common(void *calldata)
 			set_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags);
 		spin_unlock(&hdr->lock);
 	}
-	nfs_writedata_release(data);
+	nfs_pgio_data_release(data);
 }
 
 static const struct rpc_call_ops nfs_write_common_ops = {