From: Pavel Shilovsky <pshilovsky@samba.org>
Date: Thu, 10 Jul 2014 07:31:53 +0000 (+0400)
Subject: CIFS: Optimize readpages in a short read case on reconnects
X-Git-Tag: firefly_0821_release~176^2~3427^2~6
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=firefly-linux-kernel-4.4.55.git;a=commitdiff_plain;h=b770ddfa26fcb22ac85fbcdd0f5e88e65a118e01

CIFS: Optimize readpages in a short read case on reconnects

by marking pages with a data from a partially received response up-to-date.
This is suitable for non-signed connections.

Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
---

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 5d2501df8f6b..12b64e02eee1 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3281,25 +3281,30 @@ int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
 static void
 cifs_readv_complete(struct work_struct *work)
 {
-	unsigned int i;
+	unsigned int i, got_bytes;
 	struct cifs_readdata *rdata = container_of(work,
 						struct cifs_readdata, work);
 
+	got_bytes = rdata->got_bytes;
 	for (i = 0; i < rdata->nr_pages; i++) {
 		struct page *page = rdata->pages[i];
 
 		lru_cache_add_file(page);
 
-		if (rdata->result == 0) {
+		if (rdata->result == 0 ||
+		    (rdata->result == -EAGAIN && got_bytes)) {
 			flush_dcache_page(page);
 			SetPageUptodate(page);
 		}
 
 		unlock_page(page);
 
-		if (rdata->result == 0)
+		if (rdata->result == 0 ||
+		    (rdata->result == -EAGAIN && got_bytes))
 			cifs_readpage_to_fscache(rdata->mapping->host, page);
 
+		got_bytes -= min_t(unsigned int, PAGE_CACHE_SIZE, got_bytes);
+
 		page_cache_release(page);
 		rdata->pages[i] = NULL;
 	}