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xfstests: generic/315: allow a little tolerance for our used check

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So df in btrfs is tricky at best, and relying on it for accurate information is
not great, but it's the best way to verify this test.  To get around btrfs being
inconsistent sometimes just use _within_tolerance to check our new df value to
make sure that our truncate did something.  With this patch I no longer see
transient failures of this test.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Reviewed-by: Jie Liu <jeff.liu@oracle.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Josef Bacik
2013-07-29 14:55:56 -04:00
committed by Ben Myers
parent f2c8cf5b3a
commit 54d6adf7c9
1 changed files with 2 additions and 1 deletions
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tests/generic/315
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@@ -73,7 +73,8 @@ sync
# Preallocated disk space should be released
avail_done=`df -P $TEST_DIR | awk 'END {print $4}'`
[ "$avail_done" -eq "$avail_begin" ] || _fail "Available disk space ($avail_done KiB)"
_within_tolerance "df" $avail_done $avail_begin 1%
[ $? -eq 0 ] || _fail "Available disk space ($avail_done KiB) wanted ($avail_begin KiB)"
# success, all done
exit