[sheepdog] [PATCH] object cache: fix bmap calculation

[Liu Yuan]

From: Liu Yuan <tailai.ly at taobao.com>

It uses 64 bits to represent 4M objects, so each bits will represent 64K data
or object_cache_flush_and_delete() will fail.

- add two eprintf for read/write_cache_object()

Signed-off-by: Liu Yuan <tailai.ly at taobao.com>
---
 sheep/object_cache.c |   10 ++++++++--
 sheep/sheep_priv.h   |    2 +-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/sheep/object_cache.c b/sheep/object_cache.c
index efd815f..461f8a7 100644
--- a/sheep/object_cache.c
+++ b/sheep/object_cache.c
@@ -284,8 +284,11 @@ static int write_cache_object(uint32_t vid, uint32_t idx, void *buf, size_t coun
 		eprintf("%m\n");
 		goto out;
 	}
-	if (size != count)
+	if (size != count) {
+		eprintf("size %zu, count:%zu, offset %zu %m\n",
+			size, count, offset);
 		ret = SD_RES_EIO;
+	}
 out:
 	close(fd);
 	strbuf_release(&p);
@@ -318,8 +321,11 @@ static int read_cache_object(uint32_t vid, uint32_t idx, void *buf, size_t count
 		eprintf("%m\n");
 		goto out;
 	}
-	if (size != count)
+	if (size != count) {
+		eprintf("size %zu, count:%zu, offset %zu %m\n",
+			size, count, offset);
 		ret = SD_RES_EIO;
+	}
 out:
 	close(fd);
 	strbuf_release(&p);
diff --git a/sheep/sheep_priv.h b/sheep/sheep_priv.h
index a86d98e..e9e9d08 100644
--- a/sheep/sheep_priv.h
+++ b/sheep/sheep_priv.h
@@ -420,7 +420,7 @@ static inline int sys_can_halt(void)
 
 #define CACHE_VDI_SHIFT       31
 #define CACHE_VDI_BIT         (UINT32_C(1) << CACHE_VDI_SHIFT)
-#define CACHE_BLOCK_SIZE      (UINT32_C(128) << 10) /* 128 KB */
+#define CACHE_BLOCK_SIZE      ((UINT64_C(1) << 10) * 64) /* 64 KB */
 
 struct object_cache {
 	uint32_t vid;
-- 
1.7.10.2