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fstests: add helper _require_scratch_feature

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The helper is used to test if a specific filesystem feature can
be enabled. Currently only implemented testing overlayfs features.

Overalyfs features (e.g. redirect_dir, index) are configurable from
Kconfig (the build default), by module parameter (the system default)
and per mount using the mount option ${feature}=[on|off].

The helper is going to be used by overlay tests, which depend
on the inodes index feature.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Amir Goldstein
2017-07-12 12:43:24 +03:00
committed by Eryu Guan
parent 72c2cced9d
commit 9107e08df7
1 changed files with 48 additions and 0 deletions
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common/rc
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@@ -3626,6 +3626,54 @@ _get_fs_sysfs_attr()
cat /sys/fs/${FSTYP}/${dname}/${attr} cat /sys/fs/${FSTYP}/${dname}/${attr}
} }
# Print the value of a filesystem module parameter
# at /sys/module/$FSTYP/parameters/$PARAM
#
# Usage example (FSTYP=overlay):
# _get_fs_module_param index
_get_fs_module_param()
{
cat /sys/module/${FSTYP}/parameters/${1} 2>/dev/null
}
# Generic test for specific filesystem feature.
# Currently only implemented to test overlayfs features.
_require_scratch_feature()
{
local feature=$1
case "$FSTYP" in
overlay)
# overalyfs features (e.g. redirect_dir, index) are
# configurable from Kconfig (the build default), by module
# parameter (the system default) and per mount by mount
# option ${feature}=[on|off].
#
# If the module parameter does not exist then there is no
# point in checking the mount option.
local default=`_get_fs_module_param ${feature}`
[ "$default" = Y ] || [ "$default" = N ] || \
_notrun "feature '${feature}' not supported by ${FSTYP}"
_scratch_mkfs > /dev/null 2>&1
_scratch_mount -o ${feature}=on || \
_notrun "${FSTYP} feature '${feature}' cannot be enabled on ${SCRATCH_DEV}"
# Check options to be sure. For example, Overlayfs will fallback to
# index=off if underlying fs does not support file handles.
# Overlayfs only displays mount option if it differs from the default.
# Overlayfs may enable the feature, but fallback to read-only mount.
((( [ "$default" = N ] && _fs_options $SCRATCH_DEV | grep -q "${feature}=on" ) || \
( [ "$default" = Y ] && ! _fs_options $SCRATCH_DEV | grep -q "${feature}=off" )) && \
touch $SCRATCH_MNT/foo 2>/dev/null ) || \
_notrun "${FSTYP} feature '${feature}' cannot be enabled on ${SCRATCH_DEV}"
_scratch_unmount
;;
*)
_fail "Test for feature '${feature}' of ${FSTYP} is not implemented"
;;
esac
}
init_rc init_rc