Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.10 050/129] ceph: Avoid data inconsistency due to d-cache aliasing in readpage() | Date | Mon, 6 Jan 2014 14:37:59 -0800 |
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3.10-stable review patch. If anyone has any objections, please let me know.
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From: Li Wang <liwang@ubuntukylin.com>
commit 56f91aad69444d650237295f68c195b74d888d95 upstream.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/ceph/addr.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -213,9 +213,13 @@ static int readpage_nounlock(struct file 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);
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