Commit 56f91aad authored Nov 13, 2013 by Li Wang Committed by Sage Weil Dec 13, 2013

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>

parent 86b58d13

fs/ceph/addr.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -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);
		} else {
		flush_dcache_page(page);
		}
		}
		SetPageUptodate(page);