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Ensure dd creates the full 8K input test file.

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Without `iflag=fullblock` we encounter sporadic cases where the
input file to the truncate test isn't fully written to 8K and ends
up to be only 4K. The subsequent truncate tests then fail.

We add a check to the input test file size just to be sure in the
future.

Signed-off-by: Auke Kok <auke.kok@versity.com>
This commit is contained in:
Auke Kok
2023-10-23 17:04:19 -04:00
parent d71583bcf5
commit 707e1b2d59
1 changed files with 6 additions and 1 deletions
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7
tests/tests/basic-truncate.sh
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@@ -11,8 +11,13 @@ FILE="$T_D0/file"
# final block as we truncated past it.
#
echo "== truncate writes zeroed partial end of file block"
yes | dd of="$FILE" bs=8K count=1 status=none
yes | dd of="$FILE" bs=8K count=1 status=none iflag=fullblock
sync
# not passing iflag=fullblock causes the file occasionally to just be
# 4K, so just to be safe we should at least check size once
test `stat --printf="%s\n" "$FILE"` -eq 8192 || t_fail "test file incorrect start size"
truncate -s 6K "$FILE"
truncate -s 12K "$FILE"
echo 3 > /proc/sys/vm/drop_caches