ceph: pass proper page offset to copy_page_to_iter()

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 19af25dff644..fec9ddcf1528 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -470,8 +470,11 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
                         size_t left = ret;
 
                         while (left) {
-                                int copy = min_t(size_t, PAGE_SIZE, left);
-                                l = copy_page_to_iter(pages[k++], 0, copy, i);
+                                size_t page_off = off & ~PAGE_MASK;
+                                size_t copy = min_t(size_t,
+                                                    PAGE_SIZE - page_off, left);
+                                l = copy_page_to_iter(pages[k++], page_off,
+                                                      copy, i);
                                 off += l;
                                 left -= l;
                                 if (l < copy)