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common/rc: factor out _ext4_disable_extent_zeroout() helper

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1) This pattern is repeated in several seek_data/hole tests
   (e.g. generic/285, generic/436, generic/445 generic/448)
   and generic/009.  A common _ext4_disable_extent_zeroout()
   helper could be added and applied by generic/009 and
   _require_seek_data_hole().

2) On some old kernels(e.g. v3.1-v3.6), when vfs recognizes
   SEEK_DATA/HOLE flag && ext4 has no extent zeroout tunable
   in sysfs, these cases may trigger "sysfs entry not found"
   issue.  We can add check if extent_max_zeroout_kb exists
   on ext4 filesystem.
   The extent_max_zeroout_kb is introduced by:
   '67a5da564f97 ("ext4: make the zero-out chunk size tunable")'

3) Declare several vars as local in _require_seek_data_hole().

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Xiao Yang
2017-07-24 18:44:31 +08:00
committed by Eryu Guan
parent 8489391928
commit 22b17d9e4f
6 changed files with 23 additions and 33 deletions
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common/rc
+22 -7
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@@ -2295,16 +2295,31 @@ _require_fail_make_request()
not found. Seems that CONFIG_FAIL_MAKE_REQUEST kernel config option not enabled"
}
#
# Disable extent zeroing for ext4 on the given device
_ext4_disable_extent_zeroout()
{
local dev=${1:-$TEST_DEV}
local sdev=`_short_dev $dev`
[ -f /sys/fs/ext4/$sdev/extent_max_zeroout_kb ] && \
echo 0 >/sys/fs/ext4/$sdev/extent_max_zeroout_kb
}
# Check if the file system supports seek_data/hole
#
_require_seek_data_hole()
{
testfile=$TEST_DIR/$$.seek
testseek=`$here/src/seek_sanity_test -t $testfile 2>&1`
rm -f $testfile &>/dev/null
echo $testseek | grep -q "Kernel does not support" && \
_notrun "File system does not support llseek(2) SEEK_DATA/HOLE"
local dev=${1:-$TEST_DEV}
local testfile=$TEST_DIR/$$.seek
local testseek=`$here/src/seek_sanity_test -t $testfile 2>&1`
rm -f $testfile &>/dev/null
echo $testseek | grep -q "Kernel does not support" && \
_notrun "File system does not support llseek(2) SEEK_DATA/HOLE"
# Disable extent zeroing for ext4 as that change where holes are
# created
if [ "$FSTYP" = "ext4" ]; then
_ext4_disable_extent_zeroout $dev
fi
}
_require_runas()