[Sheepdog] [PATCH] fixed a bug of reading length which may cause core dump.

[Li Wenpeng]

From: levin li <xingke.lwp at taobao.com>

in farm_link(), when we try to put the object from the trunk
to the object directory, we specified a const length SD_DATA_OBJ_SIZE,
but the object we try to put may has a different length, which may
cause core dump in some case.

Signed-off-by: levin li <xingke.lwp at taobao.com>
---
 sheep/farm/farm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/sheep/farm/farm.c b/sheep/farm/farm.c
index bb84ce6..e502462 100644
--- a/sheep/farm/farm.c
+++ b/sheep/farm/farm.c
@@ -507,7 +507,7 @@ static int farm_link(uint64_t oid, struct siocb *iocb, int tgt_epoch)
 	if (!buf)
 		goto out;
 
-	io.length = SD_DATA_OBJ_SIZE;
+	io.length = iocb->length;
 	io.buf = buf;
 	ret = farm_atomic_put(oid, &io);
 out:
-- 
1.7.1