[PATCH] Btrfs-progs: don't output baffling message when checking a fresh fs

[PATCH] Btrfs-progs: don't output baffling message when checking a fresh fs

[Miao Xie]

As we know,  a new fs doesn't have space cache, so we set the cache generation
of the super block to be -1ULL, it is not equal to the fs generation. But the
check program didn't consider this case, and output the following message

  cache and super generation don't match, space cache will be invalidated

directly, it would be baffling the users. So we should avoid outputing such
message. This patch fixes this problem.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
---
 cmds-check.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cmds-check.c b/cmds-check.c
index 8015288..918e577 100644
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -3210,7 +3210,8 @@ static int check_space_cache(struct btrfs_root *root)
 	int ret;
 	int error = 0;
 
-	if (btrfs_super_generation(root->fs_info->super_copy) !=
+	if (btrfs_super_cache_generation(root->fs_info->super_copy) != -1ULL &&
+	    btrfs_super_generation(root->fs_info->super_copy) !=
 	    btrfs_super_cache_generation(root->fs_info->super_copy)) {
 		printf("cache and super generation don't match, space cache "
 		       "will be invalidated\n");
-- 
1.8.1.4