NFS: Always provide aligned buffers to the RPC read layers

Instead of messing around with XDR padding in the RDMA layer, we should just give the RPC layer an aligned buffer. Try to avoid creating extra RPC calls by aligning to the smaller value of ALIGN(len, rsize) and PAGE_SIZE. Signed-off-by: Trond Myklebust <[email protected]> Signed-off-by: Anna Schumaker <[email protected]>
rountree · Aug 30, 2021 · 8cfb901 · 8cfb901
1 parent 2a7a451
commit 8cfb901
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
@@ -293,15 +293,19 @@ static int
 readpage_async_filler(void *data, struct page *page)
 {
 	struct nfs_readdesc *desc = data;
+	struct inode *inode = page_file_mapping(page)->host;
+	unsigned int rsize = NFS_SERVER(inode)->rsize;
 	struct nfs_page *new;
-	unsigned int len;
+	unsigned int len, aligned_len;
 	int error;
 
 	len = nfs_page_length(page);
 	if (len == 0)
 		return nfs_return_empty_page(page);
 
-	new = nfs_create_request(desc->ctx, page, 0, len);
+	aligned_len = min_t(unsigned int, ALIGN(len, rsize), PAGE_SIZE);
+
+	new = nfs_create_request(desc->ctx, page, 0, aligned_len);
 	if (IS_ERR(new))
 		goto out_error;