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authorLi Wang <liwang@ubuntukylin.com>2013-11-13 11:22:14 +0400
committerSage Weil <sage@inktank.com>2013-12-13 21:11:38 +0400
commit56f91aad69444d650237295f68c195b74d888d95 (patch)
treed7fa97e32f52862d91318f30bd4f3163aa8d7c61 /fs/ceph/addr.c
parent86b58d13134ef14f09f8c8f37797ccc37cf823a3 (diff)
downloadlinux-56f91aad69444d650237295f68c195b74d888d95.tar.xz
ceph: Avoid data inconsistency due to d-cache aliasing in readpage()
If the length of data to be read in readpage() is exactly PAGE_CACHE_SIZE, the original code does not flush d-cache for data consistency after finishing reading. This patches fixes this. Signed-off-by: Li Wang <liwang@ubuntukylin.com> Signed-off-by: Sage Weil <sage@inktank.com>
Diffstat (limited to 'fs/ceph/addr.c')
-rw-r--r--fs/ceph/addr.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 1e561c059539..ec3ba43b9faa 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -210,9 +210,13 @@ static int readpage_nounlock(struct file *filp, struct page *page)
if (err < 0) {
SetPageError(page);
goto out;
- } else if (err < PAGE_CACHE_SIZE) {
+ } else {
+ if (err < PAGE_CACHE_SIZE) {
/* zero fill remainder of page */
- zero_user_segment(page, err, PAGE_CACHE_SIZE);
+ zero_user_segment(page, err, PAGE_CACHE_SIZE);
+ } else {
+ flush_dcache_page(page);
+ }
}
SetPageUptodate(page);