From: Mike Christie <micha...@cs.wisc.edu>
Signed-off-by: Mike Christie <micha...@cs.wisc.edu>
---
include/linux/ceph/decode.h | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/include/linux/ceph/decode.h b/include/linux/ceph/decode.h
index a6ef9cc..b55c7fd 100644
--- a/include/linux/ceph/decode.h
+++ b/include/linux/ceph/decode.h
@@ -255,5 +255,28 @@ static inline void ceph_encode_string(void **p, void *end,
ceph_encode_string(p, end, s, n); \
} while (0)
+/**
+ * ceph_start_decoding - start a decoding block
+ * @p: buffer to decode
+ * @end: end of buffer
+ * @curr_ver: current version of the encoding that the code supports/encode
+ * @len: buffer to return len of data in buffer
+ */
+static inline int ceph_start_decoding(void **p, void *end, u8 curr_ver,
+ u32 *len)
+{
+ u8 struct_ver, struct_compat;
+
+ ceph_decode_8_safe(p, end, struct_ver, fail);
+ ceph_decode_8_safe(p, end, struct_compat, fail);
+
+ if (curr_ver < struct_compat)
+ return -EINVAL;
+
+ ceph_decode_32_safe(p, end, *len, fail);
+ return 0;
+fail:
+ return -ERANGE;
+}
#endif
--
1.9.3
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