The filesystem configuration file does not allow you to use symlinks to real devices given the existing sanity checks verify that the target end device matches the source. Device mapper links work but not symlinks for real drives do not. Using a symlink is desirable if you want to enable persistent tests across reboots. For example you may want to use /dev/disk/by-id/nvme-eui.* so to ensure that the same drives are used even after reboot. This is very useful if you are testing for example with a virtualized environment and are using PCIe passthrough with other qemu NVMe drives with one or many NVMe drives. To enable support just add a helper to canonicalize devices prior to running the tests. This allows one test runner, kdevops, which I just extended with support to use real NVMe drives it has support now to use nvme EUI symlinks and fallbacks to nvme model + serial symlinks as not all NVMe drives support EUIs. The drives it uses for the filesystem configuration optionally is with NVMe eui symlinks so to allow the same drives to be used over reboots. For instance this works today with real nvme drives: mkfs.xfs -f /dev/nvme0n1 mount /dev/nvme0n1 /mnt TEST_DIR=/mnt TEST_DEV=/dev/nvme0n1 FSTYP=xfs ./check generic/110 FSTYP -- xfs (debug) PLATFORM -- Linux/x86_64 flax-mtr01 6.5.0-rc3-djwx #rc3 SMP PREEMPT_DYNAMIC Wed Jul 26 14:26:48 PDT 2023 generic/110 2s Ran: generic/110 Passed all 1 tests But this does not: TEST_DIR=/mnt TEST_DEV=/dev/disk/by-id/nvme-eui.0035385411904c1e FSTYP=xfs ./check generic/110 mount: /mnt: /dev/disk/by-id/nvme-eui.0035385411904c1e already mounted on /mnt. common/rc: retrying test device mount with external set mount: /mnt: /dev/disk/by-id/nvme-eui.0035385411904c1e already mounted on /mnt. common/rc: could not mount /dev/disk/by-id/nvme-eui.0035385411904c1e on /mnt umount /mnt TEST_DIR=/mnt TEST_DEV=/dev/disk/by-id/nvme-eui.0035385411904c1e FSTYP=xfs ./check generic/110 TEST_DEV=/dev/disk/by-id/nvme-eui.0035385411904c1e is mounted but not on TEST_DIR=/mnt - aborting Already mounted result: /dev/disk/by-id/nvme-eui.0035385411904c1e /mnt This fixes this. This allows the same real drives for a test to be used over and over after reboots. Use readlink -e because that support exists since 2004: https://github.com/coreutils/coreutils/commit/e0b8973bd4b146b5fb39641a4ee7984e922c3ff5 realpath is much newer than readlink, it's first commit including support for -e dates back to 2011: https://github.com/coreutils/coreutils/commit/77ea441f79aa115f79b47d9c1fc9c0004c5c7111 Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx> --- Changes on v2: - Enhanced the commit log to describe the existing status quo where at least device mapper symlinks work but not for real drives. Also provide an example output of the issue and use case as implied by Darrick. - Added CANON_DEVS to disable this by default, document it - simplify _canonicalize_devices() with as many one liners as possible - use readlink -e because my history scavanging has found it has existed for 7 years longer thjan realpath -e support. Documen this on the commit log as well. README | 3 +++ check | 1 + common/config | 32 +++++++++++++++++++++++++++++++- 3 files changed, 35 insertions(+), 1 deletion(-) diff --git a/README b/README index 1ca506492bf0..97ef63d6d693 100644 --- a/README +++ b/README @@ -268,6 +268,9 @@ Misc: this option is supported for all filesystems currently only -overlay is expected to run without issues. For other filesystems additional patches and fixes to the test suite might be needed. + - set CANON_DEVS=yes to canonicalize device symlinks. This will let you + for example use something like TEST_DEV/dev/disk/by-id/nvme-* so the + device remains persistent between reboots. This is disabled by default. ______________________ USING THE FSQA SUITE diff --git a/check b/check index 0bf5b22e061a..577e09655844 100755 --- a/check +++ b/check @@ -711,6 +711,7 @@ function run_section() fi get_next_config $section + _canonicalize_devices mkdir -p $RESULT_BASE if [ ! -d $RESULT_BASE ]; then diff --git a/common/config b/common/config index 6c8cb3a5ba68..7d74c285ac71 100644 --- a/common/config +++ b/common/config @@ -25,6 +25,9 @@ # KEEP_DMESG - whether to keep all dmesg for each test case. # yes: keep all dmesg # no: only keep dmesg with error/warning (default) +# CANON_DEVS - whether or not to canonicalize device symlinks +# yes: canonicalize device symlinks +# no (default) do not canonicalize device if they are symlinks # # - These can be added to $HOST_CONFIG_DIR (witch default to ./config) # below or a separate local configuration file can be used (using @@ -644,6 +647,32 @@ _canonicalize_mountpoint() echo "$parent/$base" } +# Enables usage of /dev/disk/by-id/ symlinks to persist target devices +# over reboots +_canonicalize_devices() +{ + if [ "$CANON_DEVS" != "yes" ]; then + return + fi + [ -L "$TEST_DEV" ] && TEST_DEV=$(readlink -e "$TEST_DEV") + [ -L $SCRATCH_DEV ] && SCRATCH_DEV=$(readlink -e "$SCRATCH_DEV") + [ -L $TEST_LOGDEV ] && TEST_LOGDEV=$(readlink -e "$TEST_LOGDEV") + [ -L $TEST_RTDEV ] && TEST_RTDEV=$(readlink -e "$TEST_RTDEV") + [ -L $SCRATCH_RTDEV ] && SCRATCH_RTDEV=$(readlink -e "$SCRATCH_RTDEV") + [ -L $LOGWRITES_DEV ] && LOGWRITES_DEV=$(readlink -e "$LOGWRITES_DEV") + if [ ! -z "$SCRATCH_DEV_POOL" ]; then + NEW_SCRATCH_POOL="" + for i in $SCRATCH_DEV_POOL; do + if [ -L $i ]; then + NEW_SCRATCH_POOL="$NEW_SCRATCH_POOL $(readlink -e $i)" + else + NEW_SCRATCH_POOL="$NEW_SCRATCH_POOL $i)" + fi + done + SCRATCH_DEV_POOL="$NEW_SCRATCH_POOL" + fi +} + # On check -overlay, for the non multi section config case, this # function is called on every test, before init_rc(). # When SCRATCH/TEST_* vars are defined in config file, config file @@ -774,7 +803,6 @@ get_next_config() { fi parse_config_section $1 - if [ ! -z "$OLD_FSTYP" ] && [ $OLD_FSTYP != $FSTYP ]; then [ -z "$MOUNT_OPTIONS" ] && _mount_opts [ -z "$TEST_FS_MOUNT_OPTS" ] && _test_mount_opts @@ -890,5 +918,7 @@ else fi fi +_canonicalize_devices + # make sure this script returns success /bin/true -- 2.39.2
