[1/6] btrfs-progs: fix floating point exception for btrfs-calc-size

Commit Message

Zhaolei Oct. 29, 2015, 9:31 a.m. UTC

Current code exit with floating point exception on a blank fs:
 # btrfs-calc-size -b /dev/sda6
 Calculating size of root tree
         Total size: 16384
                 Inline data: 0
         Total seeks: 0
                 Forward seeks: 0
                 Backward seeks: 0
 Floating point exception

This patch add a condition check for above case.

Signed-off-by: Zhao Lei <[e-mail]>
---
 btrfs-calc-size.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

David Sterba Oct. 29, 2015, 1:26 p.m. UTC | #1

Hi,

paches 1,2,4,5,6 applied, thanks.
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Patch

diff --git a/btrfs-calc-size.c b/btrfs-calc-size.c
index b756693..17d44ae 100644
--- a/btrfs-calc-size.c
+++ b/btrfs-calc-size.c
@@ -372,8 +372,8 @@  out_print:
 		printf("\tTotal seeks: %Lu\n", stat.total_seeks);
 		printf("\t\tForward seeks: %Lu\n", stat.forward_seeks);
 		printf("\t\tBackward seeks: %Lu\n", stat.backward_seeks);
-		printf("\t\tAvg seek len: %Lu\n", stat.total_seek_len /
-		       stat.total_seeks);
+		printf("\t\tAvg seek len: %llu\n", stat.total_seeks ?
+			stat.total_seek_len / stat.total_seeks : 0);
 		print_seek_histogram(&stat);
 		printf("\tTotal clusters: %Lu\n", stat.total_clusters);
 		printf("\t\tAvg cluster size: %Lu\n", stat.total_cluster_size /