Messages in this thread Patch in this message |  | | From | Li Wang <> | Subject | [PATCH] Ceph: Avoid data inconsistency due to d-cache aliasing in readpage() | Date | Wed, 13 Nov 2013 15:22:14 +0800 |
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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> --- fs/ceph/addr.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 6df8bd4..7b0000a 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); -- 1.7.9.5
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