--- /dev/null
+#
+# Common btrfs specific functions
+#
+
+_btrfs_get_subvolid()
+{
+ mnt=$1
+ name=$2
+
+ $BTRFS_UTIL_PROG sub list $mnt | grep $name | awk '{ print $2 }'
+}
+
+# We check for btrfs and (optionally) features of the btrfs command
+_require_btrfs()
+{
+ cmd=$1
+ _require_command "$BTRFS_UTIL_PROG" btrfs
+ if [ -z "$1" ]; then
+ return 1;
+ fi
+ $BTRFS_UTIL_PROG $cmd --help >/dev/null 2>&1
+ [ $? -eq 0 ] || _notrun "$BTRFS_UTIL_PROG too old (must support $cmd)"
+}
+
+_run_btrfs_util_prog()
+{
+ run_check $BTRFS_UTIL_PROG $*
+}
+
+_require_btrfs_send_stream_version()
+{
+ $BTRFS_UTIL_PROG send 2>&1 | \
+ grep '^[ \t]*\-\-stream\-version <version>' > /dev/null 2>&1
+ if [ $? -ne 0 ]; then
+ _notrun "Missing btrfs-progs send --stream-version command line option, skipped this test"
+ fi
+
+ # test if btrfs kernel supports send stream version 2
+ if [ ! -f /sys/fs/btrfs/send/stream_version ]; then
+ _notrun "Missing btrfs kernel patch for send stream version 2, skipped this test"
+ fi
+}
+
+_require_btrfs_mkfs_feature()
+{
+ if [ -z $1 ]; then
+ echo "Missing feature name argument for _require_btrfs_mkfs_feature"
+ exit 1
+ fi
+ feat=$1
+ $MKFS_BTRFS_PROG -O list-all 2>&1 | \
+ grep '^[ \t]*'"$feat"'\b' > /dev/null 2>&1
+ [ $? -eq 0 ] || \
+ _notrun "Feature $feat not supported in the available version of mkfs.btrfs"
+}
+
+_require_btrfs_fs_feature()
+{
+ if [ -z $1 ]; then
+ echo "Missing feature name argument for _require_btrfs_fs_feature"
+ exit 1
+ fi
+ feat=$1
+ modprobe btrfs > /dev/null 2>&1
+ [ -e /sys/fs/btrfs/features/$feat ] || \
+ _notrun "Feature $feat not supported by the available btrfs version"
+}
+
+_check_btrfs_filesystem()
+{
+ device=$1
+
+ # If type is set, we're mounted
+ type=`_fs_type $device`
+ ok=1
+
+ if [ "$type" = "$FSTYP" ]; then
+ # mounted ...
+ mountpoint=`_umount_or_remount_ro $device`
+ fi
+
+ btrfsck $device >$tmp.fsck 2>&1
+ if [ $? -ne 0 ]; then
+ echo "_check_btrfs_filesystem: filesystem on $device is inconsistent (see $seqres.full)"
+
+ echo "_check_btrfs_filesystem: filesystem on $device is inconsistent" >>$seqres.full
+ echo "*** fsck.$FSTYP output ***" >>$seqres.full
+ cat $tmp.fsck >>$seqres.full
+ echo "*** end fsck.$FSTYP output" >>$seqres.full
+
+ ok=0
+ fi
+ rm -f $tmp.fsck
+
+ if [ $ok -eq 0 ]; then
+ echo "*** mount output ***" >>$seqres.full
+ _mount >>$seqres.full
+ echo "*** end mount output" >>$seqres.full
+ elif [ "$type" = "$FSTYP" ]; then
+ # was mounted ...
+ _mount_or_remount_rw "$MOUNT_OPTIONS" $device $mountpoint
+ ok=$?
+ fi
+
+ if [ $ok -eq 0 ]; then
+ status=1
+ if [ "$iam" != "check" ]; then
+ exit 1
+ fi
+ return 1
+ fi
+
+ return 0
+}
+
+_require_btrfs_dev_del_by_devid()
+{
+ $BTRFS_UTIL_PROG device delete --help | egrep devid > /dev/null 2>&1
+ [ $? -eq 0 ] || _notrun "$BTRFS_UTIL_PROG too old "\
+ "(must support 'btrfs device delete <devid> /<mnt>')"
+}
+
+# get btrfs profile configs being tested
+#
+# A set of pre-set profile configs are exported via _btrfs_profile_configs
+# array. Default configs can be overridden by setting BTRFS_PROFILE_CONFIGS
+# var in the format "metadata_profile:data_profile", multiple configs can be
+# seperated by space, e.g.
+# export BTRFS_PROFILE_CONFIGS="raid0:raid0 raid1:raid1 dup:single"
+_btrfs_get_profile_configs()
+{
+ if [ "$FSTYP" != "btrfs" ]; then
+ return
+ fi
+
+ if [ -z "$BTRFS_PROFILE_CONFIGS" ]; then
+ # Default configurations to test.
+ local configs=(
+ "single:single"
+ "dup:single"
+ "raid0:raid0"
+ "raid1:raid0"
+ "raid1:raid1"
+ "raid10:raid10"
+ "raid5:raid5"
+ "raid6:raid6"
+ )
+ else
+ # User-provided configurations.
+ local configs=(${BTRFS_PROFILE_CONFIGS[@]})
+ fi
+
+ _btrfs_profile_configs=()
+ for cfg in "${configs[@]}"; do
+ local supported=true
+ local profiles=(${cfg/:/ })
+ if [ "$1" == "replace" ]; then
+ # We can't do replace with these profiles because they
+ # imply only one device ($SCRATCH_DEV), and we need to
+ # keep $SCRATCH_DEV around for _scratch_mount
+ # and _check_scratch_fs.
+ local unsupported=(
+ "dup"
+ )
+ elif [ "$1" == "replace-missing" ]; then
+ # We can't replace missing devices with these profiles
+ # because there isn't enough redundancy.
+ local unsupported=(
+ "single"
+ "dup"
+ "raid0"
+ )
+ else
+ local unsupported=()
+ fi
+ for unsupp in "${unsupported[@]}"; do
+ if [ "${profiles[0]}" == "$unsupp" -o "${profiles[1]}" == "$unsupp" ]; then
+ if [ -z "$BTRFS_PROFILE_CONFIGS" ]; then
+ # For the default config, just omit it.
+ supported=false
+ else
+ # For user-provided config, don't run the test.
+ _notrun "Profile $unsupp not supported for $1"
+ fi
+ fi
+ done
+ if "$supported"; then
+ _btrfs_profile_configs+=("-m ${profiles[0]} -d ${profiles[1]}")
+ fi
+ done
+ export _btrfs_profile_configs
+}
+
+# stress btrfs by running balance operation in a loop
+_btrfs_stress_balance()
+{
+ local options=$@
+ while true; do
+ $BTRFS_UTIL_PROG balance start $options
+ done
+}
+
+# stress btrfs by creating/mounting/umounting/deleting subvolume in a loop
+_btrfs_stress_subvolume()
+{
+ local btrfs_dev=$1
+ local btrfs_mnt=$2
+ local subvol_name=$3
+ local subvol_mnt=$4
+ local stop_file=$5
+
+ mkdir -p $subvol_mnt
+ while [ ! -e $stop_file ]; do
+ $BTRFS_UTIL_PROG subvolume create $btrfs_mnt/$subvol_name
+ $MOUNT_PROG -o subvol=$subvol_name $btrfs_dev $subvol_mnt
+ $UMOUNT_PROG $subvol_mnt
+ $BTRFS_UTIL_PROG subvolume delete $btrfs_mnt/$subvol_name
+ done
+}
+
+# stress btrfs by running scrub in a loop
+_btrfs_stress_scrub()
+{
+ local btrfs_mnt=$1
+ while true; do
+ $BTRFS_UTIL_PROG scrub start -B $btrfs_mnt
+ done
+}
+
+# stress btrfs by defragmenting every file/dir in a loop and compress file
+# contents while defragmenting if second argument is not "nocompress"
+_btrfs_stress_defrag()
+{
+ local btrfs_mnt=$1
+ local compress=$2
+
+ while true; do
+ if [ "$compress" == "nocompress" ]; then
+ find $btrfs_mnt \( -type f -o -type d \) -exec \
+ $BTRFS_UTIL_PROG filesystem defrag {} \;
+ else
+ find $btrfs_mnt \( -type f -o -type d \) -exec \
+ $BTRFS_UTIL_PROG filesystem defrag -clzo {} \;
+ find $btrfs_mnt \( -type f -o -type d \) -exec \
+ $BTRFS_UTIL_PROG filesystem defrag -czlib {} \;
+ fi
+ done
+}
+
+# stress btrfs by remounting it with different compression algorithms in a loop
+# run this with fsstress running at background could exercise the compression
+# code path and ensure no race when switching compression algorithm with constant
+# I/O activity.
+_btrfs_stress_remount_compress()
+{
+ local btrfs_mnt=$1
+ while true; do
+ for algo in no zlib lzo; do
+ $MOUNT_PROG -o remount,compress=$algo $btrfs_mnt
+ done
+ done
+}
+
+# stress btrfs by replacing devices in a loop
+# Note that at least 3 devices are needed in SCRATCH_DEV_POOL and the last
+# device should be free(not used by btrfs)
+_btrfs_stress_replace()
+{
+ local btrfs_mnt=$1
+
+ # The device number in SCRATCH_DEV_POOL should be at least 3,
+ # one is SCRATCH_DEV, one is to be replaced, one is free device
+ # we won't replace SCRATCH_DEV, see below for reason
+ if [ "`echo $SCRATCH_DEV_POOL | wc -w`" -lt 3 ]; then
+ echo "_btrfs_stress_replace requires at least 3 devices in SCRATCH_DEV_POOL"
+ return
+ fi
+
+ # take the last device as the first free_dev
+ local free_dev="`echo $SCRATCH_DEV_POOL | $AWK_PROG '{print $NF}'`"
+
+ # free_dev should be really free
+ if $BTRFS_UTIL_PROG filesystem show $btrfs_mnt | grep -q "$free_dev"; then
+ echo "_btrfs_stress_replace: $free_dev is used by btrfs"
+ return
+ fi
+
+ # dev_pool is device list being currently used by btrfs (excluding SCRATCH_DEV)
+ # and can be replaced. We don't replace SCRATCH_DEV because it will be used in
+ # _scratch_mount and _check_scratch_fs etc.
+ local dev_pool=`echo $SCRATCH_DEV_POOL | sed -e "s# *$SCRATCH_DEV *##" \
+ -e "s# *$free_dev *##"`
+
+ # set the first device in dev_pool as the first src_dev to be replaced
+ local src_dev=`echo $dev_pool | $AWK_PROG '{print $1}'`
+
+ echo "dev_pool=$dev_pool"
+ echo "free_dev=$free_dev, src_dev=$src_dev"
+ while true; do
+ echo "Replacing $src_dev with $free_dev"
+ $BTRFS_UTIL_PROG replace start -fB $src_dev $free_dev $btrfs_mnt
+ if [ $? -ne 0 ]; then
+ # don't update src_dev and free_dev if replace failed
+ continue
+ fi
+ dev_pool="$dev_pool $free_dev"
+ dev_pool=`echo $dev_pool | sed -e "s# *$src_dev *##"`
+ free_dev=$src_dev
+ src_dev=`echo $dev_pool | $AWK_PROG '{print $1}'`
+ done
+}
+
+# find the right option to force output in bytes, older versions of btrfs-progs
+# print that by default, newer print human readable numbers with unit suffix
+_btrfs_qgroup_units()
+{
+ $BTRFS_UTIL_PROG qgroup show --help 2>&1 | grep -q -- --raw && echo "--raw"
+}
+
+_require_btrfs_loadable()
+{
+ modprobe -r btrfs || _notrun "btrfs unloadable"
+ modprobe btrfs || _notrun "Can't load btrfs"
+}
+
+_reload_btrfs_ko()
+{
+ modprobe -r btrfs || _fail "btrfs unload failed"
+ modprobe btrfs || _fail "btrfs load failed"
+}
fi
}
-_btrfs_get_subvolid()
-{
- mnt=$1
- name=$2
-
- $BTRFS_UTIL_PROG sub list $mnt | grep $name | awk '{ print $2 }'
-}
-
# Prints the md5 checksum of a given file
_md5_checksum()
{
# make sure we have a standard umask
umask 022
-# check for correct setup
+# check for correct setup and source the $FSTYP specific functions now
case "$FSTYP" in
xfs)
[ "$XFS_LOGPRINT_PROG" = "" ] && _fatal "xfs_logprint not found"
[ "$XFS_DB_PROG" = "" ] && _fatal "xfs_db not found"
[ "$MKFS_XFS_PROG" = "" ] && _fatal "mkfs_xfs not found"
- #source the XFS specific functions now.
. ./common/xfs
;;
udf)
;;
btrfs)
[ "$MKFS_BTRFS_PROG" = "" ] && _fatal "mkfs.btrfs not found"
+
+ . ./common/btrfs
;;
ext4)
[ "$MKFS_EXT4_PROG" = "" ] && _fatal "mkfs.ext4 not found"
_notrun "not suitable for this OS: $HOSTOS"
}
-_require_btrfs_loadable()
-{
- modprobe -r btrfs || _notrun "btrfs unloadable"
- modprobe btrfs || _notrun "Can't load btrfs"
-}
-
-_reload_btrfs_ko()
-{
- modprobe -r btrfs || _fail "btrfs unload failed"
- modprobe btrfs || _fail "btrfs load failed"
-}
-
# this test needs a scratch partition - check we're ok & unmount it
# No post-test check of the device is required. e.g. the test intentionally
# finishes the test with the filesystem in a corrupt state
return 0
}
-_check_btrfs_filesystem()
-{
- device=$1
-
- # If type is set, we're mounted
- type=`_fs_type $device`
- ok=1
-
- if [ "$type" = "$FSTYP" ]
- then
- # mounted ...
- mountpoint=`_umount_or_remount_ro $device`
- fi
-
- btrfsck $device >$tmp.fsck 2>&1
- if [ $? -ne 0 ]
- then
- echo "_check_btrfs_filesystem: filesystem on $device is inconsistent (see $seqres.full)"
-
- echo "_check_btrfs_filesystem: filesystem on $device is inconsistent" >>$seqres.full
- echo "*** fsck.$FSTYP output ***" >>$seqres.full
- cat $tmp.fsck >>$seqres.full
- echo "*** end fsck.$FSTYP output" >>$seqres.full
-
- ok=0
- fi
- rm -f $tmp.fsck
-
- if [ $ok -eq 0 ]
- then
- echo "*** mount output ***" >>$seqres.full
- _mount >>$seqres.full
- echo "*** end mount output" >>$seqres.full
- elif [ "$type" = "$FSTYP" ]
- then
- # was mounted ...
- _mount_or_remount_rw "$MOUNT_OPTIONS" $device $mountpoint
- ok=$?
- fi
-
- if [ $ok -eq 0 ]; then
- status=1
- if [ "$iam" != "check" ]; then
- exit 1
- fi
- return 1
- fi
-
- return 0
-}
-
_check_test_fs()
{
case $FSTYP in
done
}
-# We check for btrfs and (optionally) features of the btrfs command
-_require_btrfs()
-{
- cmd=$1
- _require_command "$BTRFS_UTIL_PROG" btrfs
- if [ -z "$1" ]; then
- return 1;
- fi
- $BTRFS_UTIL_PROG $cmd --help >/dev/null 2>&1
- [ $? -eq 0 ] || _notrun "$BTRFS_UTIL_PROG too old (must support $cmd)"
-}
-
# Check that fio is present, and it is able to execute given jobfile
_require_fio()
{
"$@" >> $seqres.full 2>&1 || _fail "failed: '$@'"
}
-_run_btrfs_util_prog()
-{
- run_check $BTRFS_UTIL_PROG $*
-}
-
-_require_btrfs_send_stream_version()
-{
- $BTRFS_UTIL_PROG send 2>&1 | \
- grep '^[ \t]*\-\-stream\-version <version>' > /dev/null 2>&1
- if [ $? -ne 0 ]; then
- _notrun "Missing btrfs-progs send --stream-version command line option, skipped this test"
- fi
-
- # test if btrfs kernel supports send stream version 2
- if [ ! -f /sys/fs/btrfs/send/stream_version ]; then
- _notrun "Missing btrfs kernel patch for send stream version 2, skipped this test"
- fi
-}
-
-_require_btrfs_mkfs_feature()
-{
- if [ -z $1 ]; then
- echo "Missing feature name argument for _require_btrfs_mkfs_feature"
- exit 1
- fi
- feat=$1
- $MKFS_BTRFS_PROG -O list-all 2>&1 | \
- grep '^[ \t]*'"$feat"'\b' > /dev/null 2>&1
- [ $? -eq 0 ] || \
- _notrun "Feature $feat not supported in the available version of mkfs.btrfs"
-}
-
-_require_btrfs_fs_feature()
-{
- if [ -z $1 ]; then
- echo "Missing feature name argument for _require_btrfs_fs_feature"
- exit 1
- fi
- feat=$1
- modprobe btrfs > /dev/null 2>&1
- [ -e /sys/fs/btrfs/features/$feat ] || \
- _notrun "Feature $feat not supported by the available btrfs version"
-}
-
_require_test_symlinks()
{
# IRIX UDF does not support symlinks
_notrun "Require fcntl advisory locks support"
}
-_require_btrfs_dev_del_by_devid()
-{
- $BTRFS_UTIL_PROG device delete --help | egrep devid > /dev/null 2>&1
- [ $? -eq 0 ] || _notrun "$BTRFS_UTIL_PROG too old "\
- "(must support 'btrfs device delete <devid> /<mnt>')"
-}
-
_require_test_lsattr()
{
testio=$(lsattr -d $TEST_DIR 2>&1)
echo $((avail_kb * 1024))
}
-# get btrfs profile configs being tested
-#
-# A set of pre-set profile configs are exported via _btrfs_profile_configs
-# array. Default configs can be overridden by setting BTRFS_PROFILE_CONFIGS
-# var in the format "metadata_profile:data_profile", multiple configs can be
-# seperated by space, e.g.
-# export BTRFS_PROFILE_CONFIGS="raid0:raid0 raid1:raid1 dup:single"
-_btrfs_get_profile_configs()
-{
- if [ "$FSTYP" != "btrfs" ]; then
- return
- fi
-
- if [ -z "$BTRFS_PROFILE_CONFIGS" ]; then
- # Default configurations to test.
- local configs=(
- "single:single"
- "dup:single"
- "raid0:raid0"
- "raid1:raid0"
- "raid1:raid1"
- "raid10:raid10"
- "raid5:raid5"
- "raid6:raid6"
- )
- else
- # User-provided configurations.
- local configs=(${BTRFS_PROFILE_CONFIGS[@]})
- fi
-
- _btrfs_profile_configs=()
- for cfg in "${configs[@]}"; do
- local supported=true
- local profiles=(${cfg/:/ })
- if [ "$1" == "replace" ]; then
- # We can't do replace with these profiles because they
- # imply only one device ($SCRATCH_DEV), and we need to
- # keep $SCRATCH_DEV around for _scratch_mount
- # and _check_scratch_fs.
- local unsupported=(
- "dup"
- )
- elif [ "$1" == "replace-missing" ]; then
- # We can't replace missing devices with these profiles
- # because there isn't enough redundancy.
- local unsupported=(
- "single"
- "dup"
- "raid0"
- )
- else
- local unsupported=()
- fi
- for unsupp in "${unsupported[@]}"; do
- if [ "${profiles[0]}" == "$unsupp" -o "${profiles[1]}" == "$unsupp" ]; then
- if [ -z "$BTRFS_PROFILE_CONFIGS" ]; then
- # For the default config, just omit it.
- supported=false
- else
- # For user-provided config, don't run the test.
- _notrun "Profile $unsupp not supported for $1"
- fi
- fi
- done
- if "$supported"; then
- _btrfs_profile_configs+=("-m ${profiles[0]} -d ${profiles[1]}")
- fi
- done
- export _btrfs_profile_configs
-}
-
-# stress btrfs by running balance operation in a loop
-_btrfs_stress_balance()
-{
- local options=$@
- while true; do
- $BTRFS_UTIL_PROG balance start $options
- done
-}
-
-# stress btrfs by creating/mounting/umounting/deleting subvolume in a loop
-_btrfs_stress_subvolume()
-{
- local btrfs_dev=$1
- local btrfs_mnt=$2
- local subvol_name=$3
- local subvol_mnt=$4
- local stop_file=$5
-
- mkdir -p $subvol_mnt
- while [ ! -e $stop_file ]; do
- $BTRFS_UTIL_PROG subvolume create $btrfs_mnt/$subvol_name
- $MOUNT_PROG -o subvol=$subvol_name $btrfs_dev $subvol_mnt
- $UMOUNT_PROG $subvol_mnt
- $BTRFS_UTIL_PROG subvolume delete $btrfs_mnt/$subvol_name
- done
-}
-
-# stress btrfs by running scrub in a loop
-_btrfs_stress_scrub()
-{
- local btrfs_mnt=$1
- while true; do
- $BTRFS_UTIL_PROG scrub start -B $btrfs_mnt
- done
-}
-
-# stress btrfs by defragmenting every file/dir in a loop and compress file
-# contents while defragmenting if second argument is not "nocompress"
-_btrfs_stress_defrag()
-{
- local btrfs_mnt=$1
- local compress=$2
-
- while true; do
- if [ "$compress" == "nocompress" ]; then
- find $btrfs_mnt \( -type f -o -type d \) -exec \
- $BTRFS_UTIL_PROG filesystem defrag {} \;
- else
- find $btrfs_mnt \( -type f -o -type d \) -exec \
- $BTRFS_UTIL_PROG filesystem defrag -clzo {} \;
- find $btrfs_mnt \( -type f -o -type d \) -exec \
- $BTRFS_UTIL_PROG filesystem defrag -czlib {} \;
- fi
- done
-}
-
-# stress btrfs by remounting it with different compression algorithms in a loop
-# run this with fsstress running at background could exercise the compression
-# code path and ensure no race when switching compression algorithm with constant
-# I/O activity.
-_btrfs_stress_remount_compress()
-{
- local btrfs_mnt=$1
- while true; do
- for algo in no zlib lzo; do
- $MOUNT_PROG -o remount,compress=$algo $btrfs_mnt
- done
- done
-}
-
-# stress btrfs by replacing devices in a loop
-# Note that at least 3 devices are needed in SCRATCH_DEV_POOL and the last
-# device should be free(not used by btrfs)
-_btrfs_stress_replace()
-{
- local btrfs_mnt=$1
-
- # The device number in SCRATCH_DEV_POOL should be at least 3,
- # one is SCRATCH_DEV, one is to be replaced, one is free device
- # we won't replace SCRATCH_DEV, see below for reason
- if [ "`echo $SCRATCH_DEV_POOL | wc -w`" -lt 3 ]; then
- echo "_btrfs_stress_replace requires at least 3 devices in SCRATCH_DEV_POOL"
- return
- fi
-
- # take the last device as the first free_dev
- local free_dev="`echo $SCRATCH_DEV_POOL | $AWK_PROG '{print $NF}'`"
-
- # free_dev should be really free
- if $BTRFS_UTIL_PROG filesystem show $btrfs_mnt | grep -q "$free_dev"; then
- echo "_btrfs_stress_replace: $free_dev is used by btrfs"
- return
- fi
-
- # dev_pool is device list being currently used by btrfs (excluding SCRATCH_DEV)
- # and can be replaced. We don't replace SCRATCH_DEV because it will be used in
- # _scratch_mount and _check_scratch_fs etc.
- local dev_pool=`echo $SCRATCH_DEV_POOL | sed -e "s# *$SCRATCH_DEV *##" \
- -e "s# *$free_dev *##"`
-
- # set the first device in dev_pool as the first src_dev to be replaced
- local src_dev=`echo $dev_pool | $AWK_PROG '{print $1}'`
-
- echo "dev_pool=$dev_pool"
- echo "free_dev=$free_dev, src_dev=$src_dev"
- while true; do
- echo "Replacing $src_dev with $free_dev"
- $BTRFS_UTIL_PROG replace start -fB $src_dev $free_dev $btrfs_mnt
- if [ $? -ne 0 ]; then
- # don't update src_dev and free_dev if replace failed
- continue
- fi
- dev_pool="$dev_pool $free_dev"
- dev_pool=`echo $dev_pool | sed -e "s# *$src_dev *##"`
- free_dev=$src_dev
- src_dev=`echo $dev_pool | $AWK_PROG '{print $1}'`
- done
-}
-
-# find the right option to force output in bytes, older versions of btrfs-progs
-# print that by default, newer print human readable numbers with unit suffix
-_btrfs_qgroup_units()
-{
- $BTRFS_UTIL_PROG qgroup show --help 2>&1 | grep -q -- --raw && echo "--raw"
-}
-
# return device size in kb
_get_device_size()
{
projects / xfstests-dev.git / commitdiff