ceph: buffer decoding helpers
Helper for decoding into a ceph_buffer, and other misc decoding helpers
we will need.
Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/decode.h b/fs/ceph/decode.h
index b90a33b..65b3e02 100644
--- a/fs/ceph/decode.h
+++ b/fs/ceph/decode.h
@@ -2,6 +2,7 @@
#define __CEPH_DECODE_H
#include <asm/unaligned.h>
+#include <linux/time.h>
#include "types.h"
@@ -65,6 +66,11 @@
ceph_decode_need(p, end, sizeof(u16), bad); \
v = ceph_decode_16(p); \
} while (0)
+#define ceph_decode_8_safe(p, end, v, bad) \
+ do { \
+ ceph_decode_need(p, end, sizeof(u8), bad); \
+ v = ceph_decode_8(p); \
+ } while (0)
#define ceph_decode_copy_safe(p, end, pv, n, bad) \
do { \
@@ -156,5 +162,33 @@
*p += len;
}
+#define ceph_encode_need(p, end, n, bad) \
+ do { \
+ if (unlikely(*(p) + (n) > (end))) \
+ goto bad; \
+ } while (0)
+
+#define ceph_encode_64_safe(p, end, v, bad) \
+ do { \
+ ceph_encode_need(p, end, sizeof(u64), bad); \
+ ceph_encode_64(p, v); \
+ } while (0)
+#define ceph_encode_32_safe(p, end, v, bad) \
+ do { \
+ ceph_encode_need(p, end, sizeof(u32), bad); \
+ ceph_encode_32(p, v); \
+ } while (0)
+#define ceph_encode_16_safe(p, end, v, bad) \
+ do { \
+ ceph_encode_need(p, end, sizeof(u16), bad); \
+ ceph_encode_16(p, v); \
+ } while (0)
+
+#define ceph_encode_copy_safe(p, end, pv, n, bad) \
+ do { \
+ ceph_encode_need(p, end, n, bad); \
+ ceph_encode_copy(p, pv, n); \
+ } while (0)
+
#endif