X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=fs%2Fnfs%2Fread.c;h=7bd7cb95c034d8bbcdbcdb05fbba5f46a291e68c;hb=ecd27b92fbb41f779d857632a69bd45dbaf0f915;hp=6ab4d5a9edf2e70f633b23e14b8e7b3c65716875;hpb=b312362be6d9155b66f3a26d9159e0a680fbd6c5;p=linux-2.6

diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 6ab4d5a9ed..7bd7cb95c0 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -27,7 +27,8 @@
 
 #define NFSDBG_FACILITY		NFSDBG_PAGECACHE
 
-static int nfs_pagein_one(struct list_head *, struct inode *);
+static int nfs_pagein_multi(struct inode *, struct list_head *, unsigned int, size_t, int);
+static int nfs_pagein_one(struct inode *, struct list_head *, unsigned int, size_t, int);
 static const struct rpc_call_ops nfs_read_partial_ops;
 static const struct rpc_call_ops nfs_read_full_ops;
 
@@ -36,9 +37,8 @@ static mempool_t *nfs_rdata_mempool;
 
 #define MIN_POOL_READ	(32)
 
-struct nfs_read_data *nfs_readdata_alloc(size_t len)
+struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount)
 {
-	unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
 	struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, GFP_NOFS);
 
 	if (p) {
@@ -79,7 +79,7 @@ void nfs_readdata_release(void *data)
 static
 int nfs_return_empty_page(struct page *page)
 {
-	memclear_highpage_flush(page, 0, PAGE_CACHE_SIZE);
+	zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
 	SetPageUptodate(page);
 	unlock_page(page);
 	return 0;
@@ -103,10 +103,10 @@ static void nfs_readpage_truncate_uninitialised_page(struct nfs_read_data *data)
 	pglen = PAGE_CACHE_SIZE - base;
 	for (;;) {
 		if (remainder <= pglen) {
-			memclear_highpage_flush(*pages, base, remainder);
+			zero_user_page(*pages, base, remainder, KM_USER0);
 			break;
 		}
-		memclear_highpage_flush(*pages, base, pglen);
+		zero_user_page(*pages, base, pglen, KM_USER0);
 		pages++;
 		remainder -= pglen;
 		pglen = PAGE_CACHE_SIZE;
@@ -130,10 +130,13 @@ static int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
 		return PTR_ERR(new);
 	}
 	if (len < PAGE_CACHE_SIZE)
-		memclear_highpage_flush(page, len, PAGE_CACHE_SIZE - len);
+		zero_user_page(page, len, PAGE_CACHE_SIZE - len, KM_USER0);
 
 	nfs_list_add_request(new, &one_request);
-	nfs_pagein_one(&one_request, inode);
+	if (NFS_SERVER(inode)->rsize < PAGE_CACHE_SIZE)
+		nfs_pagein_multi(inode, &one_request, 1, len, 0);
+	else
+		nfs_pagein_one(inode, &one_request, 1, len, 0);
 	return 0;
 }
 
@@ -230,7 +233,7 @@ static void nfs_execute_read(struct nfs_read_data *data)
  * won't see the new data until our attribute cache is updated.  This is more
  * or less conventional NFS client behavior.
  */
-static int nfs_pagein_multi(struct list_head *head, struct inode *inode)
+static int nfs_pagein_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int flags)
 {
 	struct nfs_page *req = nfs_list_entry(head->next);
 	struct page *page = req->wb_page;
@@ -242,11 +245,11 @@ static int nfs_pagein_multi(struct list_head *head, struct inode *inode)
 
 	nfs_list_remove_request(req);
 
-	nbytes = req->wb_bytes;
+	nbytes = count;
 	do {
 		size_t len = min(nbytes,rsize);
 
-		data = nfs_readdata_alloc(len);
+		data = nfs_readdata_alloc(1);
 		if (!data)
 			goto out_bad;
 		INIT_LIST_HEAD(&data->pages);
@@ -258,23 +261,19 @@ static int nfs_pagein_multi(struct list_head *head, struct inode *inode)
 
 	ClearPageError(page);
 	offset = 0;
-	nbytes = req->wb_bytes;
+	nbytes = count;
 	do {
 		data = list_entry(list.next, struct nfs_read_data, pages);
 		list_del_init(&data->pages);
 
 		data->pagevec[0] = page;
 
-		if (nbytes > rsize) {
-			nfs_read_rpcsetup(req, data, &nfs_read_partial_ops,
-					rsize, offset);
-			offset += rsize;
-			nbytes -= rsize;
-		} else {
-			nfs_read_rpcsetup(req, data, &nfs_read_partial_ops,
-					nbytes, offset);
-			nbytes = 0;
-		}
+		if (nbytes < rsize)
+			rsize = nbytes;
+		nfs_read_rpcsetup(req, data, &nfs_read_partial_ops,
+				  rsize, offset);
+		offset += rsize;
+		nbytes -= rsize;
 		nfs_execute_read(data);
 	} while (nbytes != 0);
 
@@ -291,30 +290,24 @@ out_bad:
 	return -ENOMEM;
 }
 
-static int nfs_pagein_one(struct list_head *head, struct inode *inode)
+static int nfs_pagein_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int flags)
 {
 	struct nfs_page		*req;
 	struct page		**pages;
 	struct nfs_read_data	*data;
-	unsigned int		count;
 
-	if (NFS_SERVER(inode)->rsize < PAGE_CACHE_SIZE)
-		return nfs_pagein_multi(head, inode);
-
-	data = nfs_readdata_alloc(NFS_SERVER(inode)->rsize);
+	data = nfs_readdata_alloc(npages);
 	if (!data)
 		goto out_bad;
 
 	INIT_LIST_HEAD(&data->pages);
 	pages = data->pagevec;
-	count = 0;
 	while (!list_empty(head)) {
 		req = nfs_list_entry(head->next);
 		nfs_list_remove_request(req);
 		nfs_list_add_request(req, &data->pages);
 		ClearPageError(req->wb_page);
 		*pages++ = req->wb_page;
-		count += req->wb_bytes;
 	}
 	req = nfs_list_entry(data->pages.next);
 
@@ -327,28 +320,6 @@ out_bad:
 	return -ENOMEM;
 }
 
-static int
-nfs_pagein_list(struct list_head *head, int rpages)
-{
-	LIST_HEAD(one_request);
-	struct nfs_page		*req;
-	int			error = 0;
-	unsigned int		pages = 0;
-
-	while (!list_empty(head)) {
-		pages += nfs_coalesce_requests(head, &one_request, rpages);
-		req = nfs_list_entry(one_request.next);
-		error = nfs_pagein_one(&one_request, req->wb_context->dentry->d_inode);
-		if (error < 0)
-			break;
-	}
-	if (error >= 0)
-		return pages;
-
-	nfs_async_read_error(head);
-	return error;
-}
-
 /*
  * This is the callback from RPC telling us whether a reply was
  * received or some error occurred (timeout or socket shutdown).
@@ -538,7 +509,7 @@ out_error:
 }
 
 struct nfs_readdesc {
-	struct list_head *head;
+	struct nfs_pageio_descriptor *pgio;
 	struct nfs_open_context *ctx;
 };
 
@@ -561,20 +532,22 @@ readpage_async_filler(void *data, struct page *page)
 			return PTR_ERR(new);
 	}
 	if (len < PAGE_CACHE_SIZE)
-		memclear_highpage_flush(page, len, PAGE_CACHE_SIZE - len);
-	nfs_list_add_request(new, desc->head);
+		zero_user_page(page, len, PAGE_CACHE_SIZE - len, KM_USER0);
+	nfs_pageio_add_request(desc->pgio, new);
 	return 0;
 }
 
 int nfs_readpages(struct file *filp, struct address_space *mapping,
 		struct list_head *pages, unsigned nr_pages)
 {
-	LIST_HEAD(head);
+	struct nfs_pageio_descriptor pgio;
 	struct nfs_readdesc desc = {
-		.head		= &head,
+		.pgio = &pgio,
 	};
 	struct inode *inode = mapping->host;
 	struct nfs_server *server = NFS_SERVER(inode);
+	size_t rsize = server->rsize;
+	unsigned long npages;
 	int ret = -ESTALE;
 
 	dprintk("NFS: nfs_readpages (%s/%Ld %d)\n",
@@ -593,13 +566,16 @@ int nfs_readpages(struct file *filp, struct address_space *mapping,
 	} else
 		desc.ctx = get_nfs_open_context((struct nfs_open_context *)
 				filp->private_data);
+	if (rsize < PAGE_CACHE_SIZE)
+		nfs_pageio_init(&pgio, inode, nfs_pagein_multi, rsize, 0);
+	else
+		nfs_pageio_init(&pgio, inode, nfs_pagein_one, rsize, 0);
+
 	ret = read_cache_pages(mapping, pages, readpage_async_filler, &desc);
-	if (!list_empty(&head)) {
-		int err = nfs_pagein_list(&head, server->rpages);
-		if (!ret)
-			nfs_add_stats(inode, NFSIOS_READPAGES, err);
-			ret = err;
-	}
+
+	nfs_pageio_complete(&pgio);
+	npages = (pgio.pg_bytes_written + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+	nfs_add_stats(inode, NFSIOS_READPAGES, npages);
 	put_nfs_open_context(desc.ctx);
 out:
 	return ret;