[PATCH] generic/103: leave more space for f2fs

[Sun Ke <sunke32@huawei.com>]

It failed on f2fs:
     QA output created by 103
    +fallocate: No space left on device
     Silence is golden.
    ...

Try to leave ~512KB, but during the fallocate, f2fs will be filled.
Provide error prompt: "fallocate: No space left on device".

Leave more space for f2fs.

Signed-off-by: Sun Ke <sunke32@huawei.com>
---
I add some test code
	+       df
			avail=`_get_available_space $SCRATCH_MNT`
	+       echo "avail = ${avail}"
			filesizekb=$((avail / 1024 - 512))
	+       echo "filesizekb = ${filesizekb}"
			$XFS_IO_PROG -fc "falloc 0 ${filesizekb}k" $file
	+       df
	}

f2fs:
	QA output created by 103
	+Filesystem       1K-blocks       Used   Available Use% Mounted on
	...
	+/dev/sdb          12580864     553292    12027572   5% /mnt/scratch
	+avail = 12316233728
	+filesizekb = 12027060
	+fallocate: No space left on device
	+Filesystem       1K-blocks       Used   Available Use% Mounted on
	...
	+/dev/sdb          12580864   12580864           0 100% /mnt/scratch
	Silence is golden.

xfs:
	QA output created by 103
	+Filesystem       1K-blocks       Used   Available Use% Mounted on
	...
	+/dev/sdb          12572672     120828    12451844   1% /mnt/scratch
	+avail = 12750688256
	+filesizekb = 12451332
	+Filesystem       1K-blocks       Used   Available Use% Mounted on
	...
	+/dev/sdb          12572672   12572160         512 100% /mnt/scratch
	Silence is golden.

f2fs:
	QA output created by 103
	+Filesystem       1K-blocks       Used   Available Use% Mounted on
	...
	+/dev/sdb          12319880      41048    11633304   1% /mnt/scratch
	+avail = 11912503296
	+filesizekb = 11632792
	+Filesystem       1K-blocks       Used   Available Use% Mounted on
	...
	+/dev/sdb          12319880   11673844         508 100% /mnt/scratch
	Silence is golden.

after change (f2fs)
	QA output created by 103
	Filesystem       1K-blocks       Used   Available Use% Mounted on
	...
	/dev/sdb          12580864   12580396         468 100% /tmp/scratch
	Silence is golden.

 tests/generic/103 | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tests/generic/103 b/tests/generic/103
index b22b0159623e..dfce3870781c 100755
--- a/tests/generic/103
+++ b/tests/generic/103
@@ -40,10 +40,18 @@ rm -f $seqres.full
 _consume_freesp()
 {
 	file=$1
+	leave=512
+
+	# Try to leave ~512KB, but during the fallocate, f2fs will be filled.
+	# Provide error prompt: "fallocate: No space left on device". Leave
+	# more space for f2fs.
+	if [ $FSTYP == "f2fs" ]; then
+		leave=12288
+	fi
 
 	# consume nearly all available space (leave ~512kB)
 	avail=`_get_available_space $SCRATCH_MNT`
-	filesizekb=$((avail / 1024 - 512))
+	filesizekb=$((avail / 1024 - $leave))
 	$XFS_IO_PROG -fc "falloc 0 ${filesizekb}k" $file
 }
 
-- 
2.25.4