btrfs/146: make sure hit all stripes in the case of compression

In the case of compression, each 128K input data chunk will be
compressed to 4K (because of the characters written are duplicate).
Therefore we have to write (128K * 16) to make sure every stripe can be
hit.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

diff --git a/tests/btrfs/146 b/tests/btrfs/146
index 7071c128ca0a579cec7bfde7bd359737f3ae3f3c..4d6c5be51a5a376253c15222a20a79c66d4398b2 100755 (executable)
--- a/tests/btrfs/146
+++ b/tests/btrfs/146
@@ -73,10 +73,13 @@ echo "Format and mount"
 _scratch_pool_mkfs "-d raid0 -m raid1" > $seqres.full 2>&1
 _scratch_mount
 
-# How much do we need to write? We need to hit all of the stripes. btrfs uses
-# a fixed 64k stripesize, so write enough to hit each one
+# How much do we need to write? We need to hit all of the stripes. btrfs uses a
+# fixed 64k stripesize, so write enough to hit each one. In the case of
+# compression, each 128K input data chunk will be compressed to 4K (because of
+# the characters written are duplicate). Therefore we have to write
+# (128K * 16) = 2048K to make sure every stripe can be hit.
 number_of_devices=`echo $SCRATCH_DEV_POOL | wc -w`
-write_kb=$(($number_of_devices * 64))
+write_kb=$(($number_of_devices * 2048))
 _require_fs_space $SCRATCH_MNT $write_kb
 
 testfile=$SCRATCH_MNT/fsync-err-test