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/buffer.c b/fs/ceph/buffer.c
index 2576bd4..b98086c 100644
--- a/fs/ceph/buffer.c
+++ b/fs/ceph/buffer.c
@@ -1,6 +1,7 @@
#include "ceph_debug.h"
#include "buffer.h"
+#include "decode.h"
struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp)
{
@@ -59,3 +60,19 @@
return 0;
}
+int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end)
+{
+ size_t len;
+
+ ceph_decode_need(p, end, sizeof(u32), bad);
+ len = ceph_decode_32(p);
+ dout("decode_buffer len %d\n", (int)len);
+ ceph_decode_need(p, end, len, bad);
+ *b = ceph_buffer_new(len, GFP_NOFS);
+ if (!*b)
+ return -ENOMEM;
+ ceph_decode_copy(p, (*b)->vec.iov_base, len);
+ return 0;
+bad:
+ return -EINVAL;
+}