[PATCH v2] fstests: btrfs/006: Fix false alert due to output change

[Su Yue <suy.fnst@cn.fujitsu.com>]

Btrfs-progs v4.9 changed "device status" output by adding one more
space, which differs from golden output.
Fix it by using filter '_filter_spaces' to convert multi space into one.
---
v2:
  Changed the '_filter_spaces' to match both Tab and Space and tested
all related tests.
---
 common/filter       |  2 +-
 tests/btrfs/006     | 16 ++++++++++++----
 tests/btrfs/006.out | 24 ++++++++++++------------
 3 files changed, 25 insertions(+), 17 deletions(-)

diff --git a/common/filter b/common/filter
index 397b456..98eff57 100644
--- a/common/filter
+++ b/common/filter
@@ -299,7 +299,7 @@ _filter_scratch_pool()
 
 _filter_spaces()
 {
-       sed -e 's/ [ ]*/ /g'
+	sed -e "s/\s\+/ /g"
 }
 
 _filter_quota()
diff --git a/tests/btrfs/006 b/tests/btrfs/006
index 0863394..d84dfcb 100755
--- a/tests/btrfs/006
+++ b/tests/btrfs/006
@@ -82,13 +82,21 @@ echo "== Sync filesystem"
 $BTRFS_UTIL_PROG filesystem sync $SCRATCH_MNT > /dev/null
 
 echo "== Show device stats by mountpoint"
-$BTRFS_UTIL_PROG device stats $SCRATCH_MNT | _filter_btrfs_device_stats $TOTAL_DEVS
+$BTRFS_UTIL_PROG device stats $SCRATCH_MNT | \
+    _filter_btrfs_device_stats $TOTAL_DEVS | \
+    _filter_spaces
 echo "== Show device stats by first/scratch dev"
-$BTRFS_UTIL_PROG device stats $SCRATCH_DEV | _filter_btrfs_device_stats
+$BTRFS_UTIL_PROG device stats $SCRATCH_DEV | \
+    _filter_btrfs_device_stats | \
+    _filter_spaces
 echo "== Show device stats by second dev"
-$BTRFS_UTIL_PROG device stats $FIRST_POOL_DEV | sed -e "s,$FIRST_POOL_DEV,FIRST_POOL_DEV,g"
+$BTRFS_UTIL_PROG device stats $FIRST_POOL_DEV | \
+    sed -e "s,$FIRST_POOL_DEV,FIRST_POOL_DEV,g" | \
+    _filter_spaces
 echo "== Show device stats by last dev"
-$BTRFS_UTIL_PROG device stats $LAST_POOL_DEV | sed -e "s,$LAST_POOL_DEV,LAST_POOL_DEV,g"
+$BTRFS_UTIL_PROG device stats $LAST_POOL_DEV | \
+    sed -e "s,$LAST_POOL_DEV,LAST_POOL_DEV,g" | \
+    _filter_spaces
 
 # success, all done
 status=0
diff --git a/tests/btrfs/006.out b/tests/btrfs/006.out
index 05b9ac0..a976972 100644
--- a/tests/btrfs/006.out
+++ b/tests/btrfs/006.out
@@ -16,25 +16,25 @@ Label: 'TestLabel.006'  uuid: <EXACTUUID>
 == Sync filesystem
 == Show device stats by mountpoint
 <NUMDEVS> [SCRATCH_DEV].corruption_errs <NUM>
-<NUMDEVS> [SCRATCH_DEV].flush_io_errs   <NUM>
+<NUMDEVS> [SCRATCH_DEV].flush_io_errs <NUM>
 <NUMDEVS> [SCRATCH_DEV].generation_errs <NUM>
-<NUMDEVS> [SCRATCH_DEV].read_io_errs    <NUM>
-<NUMDEVS> [SCRATCH_DEV].write_io_errs   <NUM>
+<NUMDEVS> [SCRATCH_DEV].read_io_errs <NUM>
+<NUMDEVS> [SCRATCH_DEV].write_io_errs <NUM>
 == Show device stats by first/scratch dev
 [SCRATCH_DEV].corruption_errs <NUM>
-[SCRATCH_DEV].flush_io_errs   <NUM>
+[SCRATCH_DEV].flush_io_errs <NUM>
 [SCRATCH_DEV].generation_errs <NUM>
-[SCRATCH_DEV].read_io_errs    <NUM>
-[SCRATCH_DEV].write_io_errs   <NUM>
+[SCRATCH_DEV].read_io_errs <NUM>
+[SCRATCH_DEV].write_io_errs <NUM>
 == Show device stats by second dev
-[FIRST_POOL_DEV].write_io_errs   0
-[FIRST_POOL_DEV].read_io_errs    0
-[FIRST_POOL_DEV].flush_io_errs   0
+[FIRST_POOL_DEV].write_io_errs 0
+[FIRST_POOL_DEV].read_io_errs 0
+[FIRST_POOL_DEV].flush_io_errs 0
 [FIRST_POOL_DEV].corruption_errs 0
 [FIRST_POOL_DEV].generation_errs 0
 == Show device stats by last dev
-[LAST_POOL_DEV].write_io_errs   0
-[LAST_POOL_DEV].read_io_errs    0
-[LAST_POOL_DEV].flush_io_errs   0
+[LAST_POOL_DEV].write_io_errs 0
+[LAST_POOL_DEV].read_io_errs 0
+[LAST_POOL_DEV].flush_io_errs 0
 [LAST_POOL_DEV].corruption_errs 0
 [LAST_POOL_DEV].generation_errs 0
-- 
2.9.3