ceph: limit osd read size to CEPH_MSG_MAX_DATA_LEN
libceph returns -EIO when read size > CEPH_MSG_MAX_DATA_LEN.
Link: http://tracker.ceph.com/issues/20528
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 3d48c41..85f0dba 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -887,6 +887,9 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
break;
}
+ if (!write)
+ size = min_t(u64, size, fsc->mount_options->rsize);
+
len = size;
pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
if (IS_ERR(pages)) {