From: Yan, Zheng <zyan@redhat.com>
Date: Mon, 7 Sep 2015 07:46:24 +0000 (+0800)
Subject: ceph: improve readahead for file holes
X-Git-Tag: KARO-TX6UL-2015-11-03~118^2
X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-linux.git;a=commitdiff_plain;h=8dbd263de1cba18100a9fb30fed606e6d7939b9d

ceph: improve readahead for file holes

When readahead encounters file holes, osd reply returns error -ENOENT,
finish_read() skips adding pages to the the page cache. So readahead
does not work for file holes. The fix is adding zero pages to the
page cache when -ENOENT is returned.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
---

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 98933350331c..6471e28e0586 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -276,7 +276,7 @@ static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg)
 	for (i = 0; i < num_pages; i++) {
 		struct page *page = osd_data->pages[i];
 
-		if (rc < 0)
+		if (rc < 0 && rc != ENOENT)
 			goto unlock;
 		if (bytes < (int)PAGE_CACHE_SIZE) {
 			/* zero (remainder of) page */