Y2038 October 2019

y2038@lists.linaro.org

11 participants
5 discussions

[PATCH] generic/402: fix for updated behavior of timestamp limits

by Deepa Dinamani

The mount behavior will not be altered because of the unsupported timestamps on the filesystems. Adjust the test accordingly. An updated series to be posted after the merge window is hosted at <https://github.com/deepa-hub/vfs/tree/limits> Signed-off-by: Deepa Dinamani <deepa.kernel(a)gmail.com> --- common/rc | 36 +++++++++--------- tests/generic/402 | 87 ++++++++++++++++--------------------------- tests/generic/402.out | 2 +- 3 files changed, 53 insertions(+), 72 deletions(-) diff --git a/common/rc b/common/rc index 25203bb4..39a2deb0 100644 --- a/common/rc +++ b/common/rc @@ -1959,16 +1959,9 @@ _run_aiodio() return $status } -# this test requires y2038 sysfs switch and filesystem -# timestamp ranges support. -_require_y2038() +_require_timestamp_range() { local device=${1:-$TEST_DEV} - local sysfsdir=/proc/sys/fs/fs-timestamp-check-on - - if [ ! -e $sysfsdir ]; then - _notrun "no kernel support for y2038 sysfs switch" - fi local tsmin tsmax read tsmin tsmax <<<$(_filesystem_timestamp_range $device) @@ -1980,23 +1973,32 @@ _require_y2038() _filesystem_timestamp_range() { local device=${1:-$TEST_DEV} + u32max=$(((1<<32)-1)) + s32min=-$((1<<31)) + s32max=$(((1<<31)-1)) + s64max=$(((1<<63)-1)) + s64min=$((1<<63)) + case $FSTYP in - ext4) + ext2) + echo "$s32min $s32max" + ;; + ext3|ext4) if [ $(dumpe2fs -h $device 2>/dev/null | grep "Inode size:" | cut -d: -f2) -gt 128 ]; then - echo "-2147483648 15032385535" + printf "%d %d\n" $s32min 0x37fffffff else - echo "-2147483648 2147483647" + echo "$s32min $s32max" fi ;; - xfs) - echo "-2147483648 2147483647" - ;; jfs) - echo "0 4294967295" + echo "0 $u32max" ;; - f2fs) - echo "-2147483648 2147483647" + xfs) + echo "$s32min $s32max" + ;; + btrfs) + echo "$s64min $s64max" ;; *) echo "-1 -1" diff --git a/tests/generic/402 b/tests/generic/402 index f742fedd..dd136ec2 100755 --- a/tests/generic/402 +++ b/tests/generic/402 @@ -4,15 +4,10 @@ # # FS QA Test 402 # -# Tests to verify policy for filesystem timestamps for -# supported ranges: -# 1. Verify filesystem rw mount according to sysctl -# timestamp_supported. -# 2. Verify timestamp clamping for timestamps beyond max -# timestamp supported. +# Test to verify filesystem timestamps for supported ranges. # -# Exit status 1: either or both tests above fail. -# Exit status 0: both the above tests pass. +# Exit status 1: test failed. +# Exit status 0: test passed. # seq=`basename $0` seqres=$RESULT_DIR/$seq @@ -49,47 +44,59 @@ check_stat() prev_timestamp="$timestamp;$timestamp" if [ $prev_timestamp != $stat_timestamp ]; then echo "$prev_timestamp != $stat_timestamp" | tee -a $seqres.full + return 1 fi + return 0 } run_test_individual() { + fail=0 file=$1 timestamp=$2 update_time=$3 # check if the time needs update if [ $update_time -eq 1 ]; then - echo "Updating file: $file to timestamp `date -d @$timestamp`" >> $seqres.full + echo "Updating file: $file to timestamp $timestamp" >> $seqres.full $XFS_IO_PROG -f -c "utimes $timestamp 0 $timestamp 0" $file if [ $? -ne 0 ]; then echo "Failed to update times on $file" | tee -a $seqres.full + fail=1 fi fi - tsclamp=$(($timestamp>$tsmax?$tsmax:$timestamp)) - echo "Checking file: $file Updated timestamp is `date -d @$tsclamp`" >> $seqres.full - check_stat $file $tsclamp + tsclamp=$((timestamp<tsmin?tsmin:timestamp>tsmax?tsmax:timestamp)) + echo "Checking file: $file Updated timestamp is $tsclamp" >> $seqres.full + if ! check_stat $file $tsclamp; then + fail=1 + fi + return $fail } run_test() { + fail=0 update_time=$1 n=1 for TIME in "${TIMESTAMPS[@]}"; do - run_test_individual ${SCRATCH_MNT}/test_$n $TIME $update_time + if ! run_test_individual ${SCRATCH_MNT}/test_$n $TIME $update_time; then + fail=1 + fi ((n++)) done + + return $fail } _scratch_mkfs &>> $seqres.full 2>&1 || _fail "mkfs failed" -_require_y2038 $SCRATCH_DEV +_require_timestamp_range $SCRATCH_DEV read tsmin tsmax <<<$(_filesystem_timestamp_range $SCRATCH_DEV) -echo min supported timestamp $tsmin $(date --date=@$tsmin) >> $seqres.full -echo max supported timestamp $tsmax $(date --date=@$tsmax) >> $seqres.full +echo min supported timestamp $tsmin >> $seqres.full +echo max supported timestamp $tsmax >> $seqres.full # Test timestamps array @@ -97,45 +104,14 @@ declare -a TIMESTAMPS=( $tsmin 0 $tsmax + $((tsmax/2)) $((tsmax+1)) - 4294967295 - 8589934591 - 34359738367 ) -# Max timestamp is hardcoded to Mon Jan 18 19:14:07 PST 2038 -sys_tsmax=2147483647 -echo "max timestamp that needs to be supported by fs for rw mount is" \ - "$((sys_tsmax+1)) $(date --date=@$((sys_tsmax+1)))" >> $seqres.full - -read ts_check <<<$(cat /proc/sys/fs/fs-timestamp-check-on) - _scratch_mount result=$? -if [ $ts_check -ne 0 ]; then - echo "sysctl filesystem timestamp check is on" >> $seqres.full - # check for mount failure if the minimum requirement for max timestamp - # supported is not met. - if [ $sys_tsmax -ge $tsmax ]; then - if [ $result -eq 0 ]; then - echo "mount test failed" | tee -a $seqres.full - exit - fi - else - if [ $result -ne 0 ]; then - echo "failed to mount $SCRATCH_DEV" | tee -a $seqres.full - exit - fi - fi -else - # if sysctl switch is off then mount should succeed always. - echo "sysctl filesystem timestamp check is off" >> $seqres.full - if [ $result -ne 0 ]; then - echo "failed to mount $SCRATCH_DEV and timestamp check is off" >> $seqres.full - exit - fi -fi +status=0 # Begin test case 1 echo "In memory timestamps update test start" >> $seqres.full @@ -143,7 +119,9 @@ echo "In memory timestamps update test start" >> $seqres.full # update time on the file update_time=1 -run_test $update_time +if ! run_test $update_time; then + status=1 +fi echo "In memory timestamps update complete" >> $seqres.full @@ -162,12 +140,13 @@ update_time=0 echo "On disk timestamps update test start" >> $seqres.full # Re-run test -run_test $update_time +if ! run_test $update_time; then + status=1 +fi echo "On disk timestamps update test complete" >> $seqres.full -echo "y2038 inode timestamp tests completed successfully" +echo "inode timestamp tests completed status $status" # success, all done -status=0 -exit +exit $status diff --git a/tests/generic/402.out b/tests/generic/402.out index 6c5b9308..4500e6c7 100644 --- a/tests/generic/402.out +++ b/tests/generic/402.out @@ -1,2 +1,2 @@ QA output created by 402 -y2038 inode timestamp tests completed successfully +inode timestamp tests completed status 0 -- 2.17.1

4 years, 10 months

arm version of generic VDSO?

by Arnd Bergmann

Hi Vinvenzo, I'm looking through some of the remaining y2038 work, and noticed that arch/arm64 has the new generic vdso implementation, but arch/arm does. Do you patches for using the same code on arch/arm? Arnd

5 years, 1 month

[PATCH] generic/402: update test script style

by Deepa Dinamani

Removed test result checking, as test result already depends on output diff comparison with the golden output. Signed-off-by: Deepa Dinamani <deepa.kernel(a)gmail.com> --- tests/generic/402 | 33 +++++++-------------------------- tests/generic/402.out | 2 +- 2 files changed, 8 insertions(+), 27 deletions(-) diff --git a/tests/generic/402 b/tests/generic/402 index dd136ec2..0392c258 100755 --- a/tests/generic/402 +++ b/tests/generic/402 @@ -44,14 +44,11 @@ check_stat() prev_timestamp="$timestamp;$timestamp" if [ $prev_timestamp != $stat_timestamp ]; then echo "$prev_timestamp != $stat_timestamp" | tee -a $seqres.full - return 1 fi - return 0 } run_test_individual() { - fail=0 file=$1 timestamp=$2 update_time=$3 @@ -62,33 +59,24 @@ run_test_individual() $XFS_IO_PROG -f -c "utimes $timestamp 0 $timestamp 0" $file if [ $? -ne 0 ]; then echo "Failed to update times on $file" | tee -a $seqres.full - fail=1 fi fi tsclamp=$((timestamp<tsmin?tsmin:timestamp>tsmax?tsmax:timestamp)) echo "Checking file: $file Updated timestamp is $tsclamp" >> $seqres.full - if ! check_stat $file $tsclamp; then - fail=1 - fi - return $fail + check_stat $file $tsclamp } run_test() { - fail=0 update_time=$1 n=1 for TIME in "${TIMESTAMPS[@]}"; do - if ! run_test_individual ${SCRATCH_MNT}/test_$n $TIME $update_time; then - fail=1 - fi + run_test_individual ${SCRATCH_MNT}/test_$n $TIME $update_time ((n++)) done - - return $fail } _scratch_mkfs &>> $seqres.full 2>&1 || _fail "mkfs failed" @@ -108,8 +96,7 @@ declare -a TIMESTAMPS=( $((tsmax+1)) ) -_scratch_mount -result=$? +_scratch_mount || _fail "scratch mount failed" status=0 @@ -119,9 +106,7 @@ echo "In memory timestamps update test start" >> $seqres.full # update time on the file update_time=1 -if ! run_test $update_time; then - status=1 -fi +run_test $update_time echo "In memory timestamps update complete" >> $seqres.full @@ -140,13 +125,9 @@ update_time=0 echo "On disk timestamps update test start" >> $seqres.full # Re-run test -if ! run_test $update_time; then - status=1 -fi +run_test $update_time echo "On disk timestamps update test complete" >> $seqres.full -echo "inode timestamp tests completed status $status" - -# success, all done -exit $status +echo Silence is golden +exit diff --git a/tests/generic/402.out b/tests/generic/402.out index 4500e6c7..28e1501c 100644 --- a/tests/generic/402.out +++ b/tests/generic/402.out @@ -1,2 +1,2 @@ QA output created by 402 -inode timestamp tests completed status 0 +Silence is golden -- 2.17.1

5 years, 1 month

[PATCH v6 00/43] compat_ioctl: remove most of fs/compat_ioctl.c

by Arnd Bergmann

As part of the cleanup of some remaining y2038 issues, I came to fs/compat_ioctl.c, which still has a couple of commands that need support for time64_t. In completely unrelated work, I spent time on cleaning up parts of this file in the past, moving things out into drivers instead. After Al Viro reviewed an earlier version of this series and did a lot more of that cleanup, I decided to try to completely eliminate the rest of it and move it all into drivers. This series incorporates some of Al's work and many patches of my own, but in the end stops short of actually removing the last part, which is the scsi ioctl handlers. I have patches for those as well, but they need more testing or possibly a rewrite. Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- Everything in here was posted one or more times already, sending the whole series again for review, I hope to get some input on those patches that have not already been reviewed. The entire series is also part of linux-next through https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commit/… Al Viro (8): fix compat handling of FICLONERANGE, FIDEDUPERANGE and FS_IOC_FIEMAP FIGETBSZ: fix compat compat: itanic doesn't have one do_vfs_ioctl(): use saner types compat: move FS_IOC_RESVSP_32 handling to fs/ioctl.c compat_sys_ioctl(): make parallel to do_vfs_ioctl() compat_ioctl: unify copy-in of ppp filters compat_ioctl: move PPPIOCSCOMPRESS to ppp_generic Arnd Bergmann (35): ceph: fix compat_ioctl for ceph_dir_operations compat_ioctl: drop FIOQSIZE table entry compat_ioctl: add compat_ptr_ioctl() compat_ioctl: move rtc handling into rtc-dev.c compat_ioctl: move drivers to compat_ptr_ioctl compat_ioctl: move more drivers to compat_ptr_ioctl compat_ioctl: use correct compat_ptr() translation in drivers compat_ioctl: move tape handling into drivers compat_ioctl: move ATYFB_CLK handling to atyfb driver compat_ioctl: move isdn/capi ioctl translation into driver compat_ioctl: move rfcomm handlers into driver compat_ioctl: move hci_sock handlers into driver compat_ioctl: remove HCIUART handling compat_ioctl: remove HIDIO translation compat_ioctl: remove translation for sound ioctls compat_ioctl: remove IGNORE_IOCTL() compat_ioctl: remove /dev/random commands compat_ioctl: remove joystick ioctl translation compat_ioctl: remove PCI ioctl translation compat_ioctl: remove /dev/raw ioctl translation compat_ioctl: remove last RAID handling code compat_ioctl: remove unused convert_in_user macro gfs2: add compat_ioctl support fs: compat_ioctl: move FITRIM emulation into file systems compat_ioctl: move WDIOC handling into wdt drivers compat_ioctl: reimplement SG_IO handling af_unix: add compat_ioctl support compat_ioctl: handle SIOCOUTQNSD compat_ioctl: move SIOCOUTQ out of compat_ioctl.c tty: handle compat PPP ioctls compat_ioctl: handle PPPIOCGIDLE for 64-bit time_t compat_ioctl: ppp: move simple commands into ppp_generic.c compat_ioctl: move SG_GET_REQUEST_TABLE handling pktcdvd: add compat_ioctl handler scsi: sd: enable compat ioctls for sed-opal Documentation/networking/ppp_generic.txt | 2 + arch/powerpc/platforms/52xx/mpc52xx_gpt.c | 1 + arch/um/drivers/harddog_kern.c | 1 + arch/um/drivers/hostaudio_kern.c | 1 + block/scsi_ioctl.c | 132 ++- drivers/android/binder.c | 2 +- drivers/block/pktcdvd.c | 25 + drivers/char/ipmi/ipmi_watchdog.c | 1 + drivers/char/ppdev.c | 12 +- drivers/char/random.c | 1 + drivers/char/tpm/tpm_vtpm_proxy.c | 12 +- drivers/crypto/qat/qat_common/adf_ctl_drv.c | 2 +- drivers/dma-buf/dma-buf.c | 4 +- drivers/dma-buf/sw_sync.c | 2 +- drivers/dma-buf/sync_file.c | 2 +- drivers/firewire/core-cdev.c | 12 +- drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 2 +- drivers/hid/hidraw.c | 4 +- drivers/hid/usbhid/hiddev.c | 11 +- drivers/hwmon/fschmd.c | 1 + drivers/hwtracing/stm/core.c | 12 +- drivers/ide/ide-tape.c | 27 +- drivers/iio/industrialio-core.c | 2 +- drivers/infiniband/core/uverbs_main.c | 4 +- drivers/isdn/capi/capi.c | 31 + drivers/media/rc/lirc_dev.c | 4 +- drivers/misc/cxl/flash.c | 8 +- drivers/misc/genwqe/card_dev.c | 23 +- drivers/misc/mei/main.c | 22 +- drivers/misc/vmw_vmci/vmci_host.c | 2 +- drivers/mtd/ubi/cdev.c | 36 +- drivers/net/ppp/ppp_generic.c | 245 ++++-- drivers/net/tap.c | 12 +- drivers/nvdimm/bus.c | 4 +- drivers/nvme/host/core.c | 2 +- drivers/pci/switch/switchtec.c | 2 +- drivers/platform/x86/wmi.c | 2 +- drivers/rpmsg/rpmsg_char.c | 4 +- drivers/rtc/dev.c | 13 +- drivers/rtc/rtc-ds1374.c | 1 + drivers/rtc/rtc-vr41xx.c | 10 + drivers/s390/char/tape_char.c | 41 +- drivers/sbus/char/display7seg.c | 2 +- drivers/sbus/char/envctrl.c | 4 +- drivers/scsi/3w-xxxx.c | 4 +- drivers/scsi/cxlflash/main.c | 2 +- drivers/scsi/esas2r/esas2r_main.c | 2 +- drivers/scsi/megaraid/megaraid_mm.c | 28 +- drivers/scsi/pmcraid.c | 4 +- drivers/scsi/sd.c | 14 +- drivers/scsi/sg.c | 59 +- drivers/scsi/st.c | 28 +- drivers/staging/android/ion/ion.c | 4 +- drivers/staging/pi433/pi433_if.c | 12 +- drivers/staging/vme/devices/vme_user.c | 2 +- drivers/tee/tee_core.c | 2 +- drivers/tty/tty_io.c | 5 + drivers/usb/class/cdc-wdm.c | 2 +- drivers/usb/class/usbtmc.c | 4 +- drivers/usb/core/devio.c | 16 +- drivers/usb/gadget/function/f_fs.c | 12 +- drivers/vfio/vfio.c | 39 +- drivers/vhost/net.c | 12 +- drivers/vhost/scsi.c | 12 +- drivers/vhost/test.c | 12 +- drivers/vhost/vsock.c | 12 +- drivers/video/fbdev/aty/atyfb_base.c | 12 +- drivers/virt/fsl_hypervisor.c | 2 +- drivers/watchdog/acquirewdt.c | 1 + drivers/watchdog/advantechwdt.c | 1 + drivers/watchdog/alim1535_wdt.c | 1 + drivers/watchdog/alim7101_wdt.c | 1 + drivers/watchdog/ar7_wdt.c | 1 + drivers/watchdog/at91rm9200_wdt.c | 1 + drivers/watchdog/ath79_wdt.c | 1 + drivers/watchdog/bcm63xx_wdt.c | 1 + drivers/watchdog/cpu5wdt.c | 1 + drivers/watchdog/eurotechwdt.c | 1 + drivers/watchdog/f71808e_wdt.c | 1 + drivers/watchdog/gef_wdt.c | 1 + drivers/watchdog/geodewdt.c | 1 + drivers/watchdog/ib700wdt.c | 1 + drivers/watchdog/ibmasr.c | 1 + drivers/watchdog/indydog.c | 1 + drivers/watchdog/intel_scu_watchdog.c | 1 + drivers/watchdog/iop_wdt.c | 1 + drivers/watchdog/it8712f_wdt.c | 1 + drivers/watchdog/ixp4xx_wdt.c | 1 + drivers/watchdog/m54xx_wdt.c | 1 + drivers/watchdog/machzwd.c | 1 + drivers/watchdog/mixcomwd.c | 1 + drivers/watchdog/mtx-1_wdt.c | 1 + drivers/watchdog/mv64x60_wdt.c | 1 + drivers/watchdog/nv_tco.c | 1 + drivers/watchdog/pc87413_wdt.c | 1 + drivers/watchdog/pcwd.c | 1 + drivers/watchdog/pcwd_pci.c | 1 + drivers/watchdog/pcwd_usb.c | 1 + drivers/watchdog/pika_wdt.c | 1 + drivers/watchdog/pnx833x_wdt.c | 1 + drivers/watchdog/rc32434_wdt.c | 1 + drivers/watchdog/rdc321x_wdt.c | 1 + drivers/watchdog/riowd.c | 1 + drivers/watchdog/sa1100_wdt.c | 1 + drivers/watchdog/sb_wdog.c | 1 + drivers/watchdog/sbc60xxwdt.c | 1 + drivers/watchdog/sbc7240_wdt.c | 1 + drivers/watchdog/sbc_epx_c3.c | 1 + drivers/watchdog/sbc_fitpc2_wdt.c | 1 + drivers/watchdog/sc1200wdt.c | 1 + drivers/watchdog/sc520_wdt.c | 1 + drivers/watchdog/sch311x_wdt.c | 1 + drivers/watchdog/scx200_wdt.c | 1 + drivers/watchdog/smsc37b787_wdt.c | 1 + drivers/watchdog/w83877f_wdt.c | 1 + drivers/watchdog/w83977f_wdt.c | 1 + drivers/watchdog/wafer5823wdt.c | 1 + drivers/watchdog/watchdog_dev.c | 1 + drivers/watchdog/wdrtas.c | 1 + drivers/watchdog/wdt.c | 1 + drivers/watchdog/wdt285.c | 1 + drivers/watchdog/wdt977.c | 1 + drivers/watchdog/wdt_pci.c | 1 + fs/btrfs/super.c | 2 +- fs/ceph/dir.c | 1 + fs/ceph/file.c | 2 +- fs/ceph/super.h | 1 + fs/compat_ioctl.c | 917 +------------------- fs/ecryptfs/file.c | 1 + fs/ext4/ioctl.c | 1 + fs/f2fs/file.c | 1 + fs/fat/file.c | 13 +- fs/fuse/dev.c | 2 +- fs/gfs2/file.c | 30 + fs/hpfs/dir.c | 1 + fs/hpfs/file.c | 1 + fs/ioctl.c | 80 +- fs/nilfs2/ioctl.c | 1 + fs/notify/fanotify/fanotify_user.c | 2 +- fs/ocfs2/ioctl.c | 1 + fs/userfaultfd.c | 2 +- include/linux/blkdev.h | 2 + include/linux/falloc.h | 20 + include/linux/fs.h | 7 + include/linux/mtio.h | 60 ++ include/uapi/linux/ppp-ioctl.h | 2 + include/uapi/linux/ppp_defs.h | 14 + lib/iov_iter.c | 1 + net/bluetooth/hci_sock.c | 21 +- net/bluetooth/rfcomm/sock.c | 14 +- net/rfkill/core.c | 2 +- net/socket.c | 3 + net/unix/af_unix.c | 19 + sound/core/oss/pcm_oss.c | 4 + sound/oss/dmasound/dmasound_core.c | 2 + 155 files changed, 935 insertions(+), 1394 deletions(-) create mode 100644 include/linux/mtio.h -- 2.20.0

5 years, 1 month

[PATCH] io_uring: use __kernel_timespec in timeout ABI

by Arnd Bergmann

All system calls use struct __kernel_timespec instead of the old struct timespec, but this one was just added with the old-style ABI. Change it now to enforce the use of __kernel_timespec, avoiding ABI confusion and the need for compat handlers on 32-bit architectures. Any user space caller will have to use __kernel_timespec now, but this is unambiguous and works for any C library regardless of the time_t definition. A nicer way to specify the timeout would have been a less ambiguous 64-bit nanosecond value, but I suppose it's too late now to change that as this would impact both 32-bit and 64-bit users. Fixes: 5262f567987d ("io_uring: IORING_OP_TIMEOUT support") Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> --- fs/io_uring.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index aa8ac557493c..8a0381f1a43b 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1892,15 +1892,15 @@ static int io_timeout(struct io_kiocb *req, const struct io_uring_sqe *sqe) unsigned count, req_dist, tail_index; struct io_ring_ctx *ctx = req->ctx; struct list_head *entry; - struct timespec ts; + struct timespec64 ts; if (unlikely(ctx->flags & IORING_SETUP_IOPOLL)) return -EINVAL; if (sqe->flags || sqe->ioprio || sqe->buf_index || sqe->timeout_flags || sqe->len != 1) return -EINVAL; - if (copy_from_user(&ts, (void __user *) (unsigned long) sqe->addr, - sizeof(ts))) + + if (get_timespec64(&ts, u64_to_user_ptr(sqe->addr))) return -EFAULT; /* @@ -1934,7 +1934,7 @@ static int io_timeout(struct io_kiocb *req, const struct io_uring_sqe *sqe) hrtimer_init(&req->timeout.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); req->timeout.timer.function = io_timeout_fn; - hrtimer_start(&req->timeout.timer, timespec_to_ktime(ts), + hrtimer_start(&req->timeout.timer, timespec64_to_ktime(ts), HRTIMER_MODE_REL); return 0; } -- 2.20.0

5 years, 2 months

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Y2038 October 2019