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The nvme by-id symlink changes to the latest namespace when a new namespace gets
added, for example by connecting multiple NVMe/TCP host controllers via nvme
connect-all.
That is incorrect for persistent device links.
The persistent symbolic device link should continue to point to the same NVMe
namespace throughout the lifetime of the current boot.
Therefore the namespace id needs to be added to the link name.
mkfs.btrfs (unlike mkfs.ext4) checks if the target already contains
a file system and refuses to continue if so. This causes spurious fails
in case the random garbage on the temporary device matches a valid FS
header:
[ 19.723806] testsuite-64.sh[355]: + udevadm lock --device=/dev/mapper/encbtrfs0 --device=/dev/mapper/encbtrfs1 --device=/dev/mapper/encbtrfs2 --device=/dev/mapper/encbtrfs3 mkfs.btrfs -M -d raid1 -m raid1 -L btrfs_mencdisk -U deadbeef-dead-dead-beef-000000000003 /dev/mapper/encbtrfs0 /dev/mapper/encbtrfs1 /dev/mapper/encbtrfs2 /dev/mapper/encbtrfs3
[ 19.918934] testsuite-64.sh[2494]: ERROR: /dev/mapper/encbtrfs0 appears to contain an existing filesystem (hfsplus)
[ 19.920490] testsuite-64.sh[2494]: ERROR: use the -f option to force overwrite of /dev/mapper/encbtrfs0
Let's force mkfs.btrfs to overwrite the file system in such case.
On fast systems we might race against systemd and check the mount unit
after mounting it way too early before systemd had a chance to react to
the change.
```
[ 4.677701] H systemd[1]: Event source 0x210b3b0 (mount-monitor-dispatch) entered rate limit state.
...
[ 4.863731] H testsuite-64.sh[812]: + mount /logsysfsRxx
[ 4.865918] H kernel: EXT4-fs (vda2): mounted filesystem with ordered data mode. Opts: (null)
[ 4.866213] H testsuite-64.sh[812]: + systemctl status /logsysfsRxx
[ 4.877502] H testsuite-64.sh[919]: ○ logsysfsRxx.mount - /logsysfsRxx
[ 4.877502] H testsuite-64.sh[919]: Loaded: loaded (/etc/fstab; generated)
[ 4.877502] H testsuite-64.sh[919]: Active: inactive (dead)
[ 4.877502] H testsuite-64.sh[919]: Where: /logsysfsRxx
[ 4.877502] H testsuite-64.sh[919]: What: /dev/disk/by-uuid/deadbeef-dead-dead-beef-222222222222
[ 4.877502] H testsuite-64.sh[919]: Docs: man:fstab(5)
[ 4.877502] H testsuite-64.sh[919]: man:systemd-fstab-generator(8)
[ 4.877502] H testsuite-64.sh[919]: Aug 03 10:10:10 H systemd[1]: logsysfsRxx.mount: Processing implicit device dependencies
[ 4.877502] H testsuite-64.sh[919]: Aug 03 10:10:10 H systemd[1]: logsysfsRxx.mount: Added Requires dependency on /dev/disk/by-uuid/deadbeef-dead-dead-beef-222222222222
[ 4.877502] H testsuite-64.sh[919]: Aug 03 10:10:10 H systemd[1]: logsysfsRxx.mount: Added StopPropagatedFrom dependency on /dev/disk/by-uuid/deadbeef-dead-dead-beef-222222222222
[ 4.895683] H sh[920]: + systemctl poweroff --no-block
[ 4.906533] H systemd[1]: Found unit logsysfsRxx.mount at /run/systemd/generator/logsysfsRxx.mount (regular file)
[ 4.906594] H systemd[1]: Preset files don't specify rule for logsysfsRxx.mount. Enabling.
[ 4.906990] H systemd[1]: testsuite-64.service: Main process exited, code=exited, status=3/NOTIMPLEMENTED
[ 4.907057] H systemd[1]: testsuite-64.service: Failed with result 'exit-code'.
[ 4.907287] H systemd[1]: Failed to start testsuite-64.service.
[ 4.955293] H systemd[1]: Starting end.service...
[ 4.955736] H systemd-logind[809]: The system will power off now!
[ 4.955868] H systemd-logind[809]: System is powering down.
[ 4.975781] H systemd[1]: Event source 0x210b3b0 (mount-monitor-dispatch) left rate limit state.
[ 4.975821] H systemd[1]: logsysfsRxx.mount: Processing implicit device dependencies
[ 4.975857] H systemd[1]: logsysfsRxx.mount: Added Requires dependency on /dev/vda2
[ 4.975893] H systemd[1]: logsysfsRxx.mount: Added StopPropagatedFrom dependency on /dev/vda2
[ 4.975928] H systemd[1]: Unit blockdev@dev-vda2.target has alias blockdev@.target.
[ 4.975967] H systemd[1]: logsysfsRxx.mount: Added After dependency on /dev/vda2
[ 4.976081] H systemd[1]: logsysfsRxx.mount: Changed dead -> mounted
```
Reduce the number of iterations in some of the test cases, since they
generate a huge amount of uevents and basically DoS udev (which can't
keep up while being slowed down by ASan). To avoid this, let's reduce
the number of iterations and bump the timeout when running under ASan,
since we're not interested in performance in such cases.
Otherwise we might miss the "Device path too long" message:
```
[ 21.083274] testsuite-64.sh[374]: swapoff /dev/vda1
[ 21.089841] testsuite-64.sh[376]: ++ mktemp
[ 21.095115] testsuite-64.sh[271]: + logfile=/tmp/tmp.a1MULA35wL
[ 21.095115] testsuite-64.sh[271]: + journalctl -b -q --no-pager -o short-monotonic -p info --grep 'Device path.*vda.?'\'' too long to fit into unit name'
...
[ 21.277360] systemd[1]: testsuite-64.service: Main process exited, code=exited, status=1/FAILURE
[ 21.277508] systemd[1]: testsuite-64.service: Failed with result 'exit-code'.
...
[ 21.323500] systemd[1]: Device path '/sys/devices/pci0000:00/0000:00:03.0/0000:01:00.0/0000:02:00.0/0000:03:00.0/0000:04:00.0/0000:05:00.0/0000:06:00.0/0000:07:00.0/0000:08:00.0/0000:09:00.0/0000:0a:00.0/0000:0b:00.0/0000:0c:00.0/0000:0d:00.0/0000:0e:00.0/0000:0f:00.0/0000:10:00.0/0000:11:00.0/0000:12:00.0/0000:13:00.0/0000:14:00.0/0000:15:00.0/0000:16:00.0/0000:17:00.0/0000:18:00.0/0000:19:00.0/0000:1a:00.0/virtio0/block/vda/vda1' too long to fit into unit name, ignoring device.
```
The new lvm autoactivation method runs `vgchange` via
`systemd-run --no-block`[0], which means that checking if the unit
is in the `active` state is not enough, since the main binary might
still be running. Let's fix this by waiting until the unit reaches
the `exited` sub state.
Follow-up to:
* 29f8bef05e
* e50d743f99
[0] https://sourceware.org/git/?p=lvm2.git;a=blob;f=udev/69-dm-lvm.rules.in;h=39e5b98074010745f78a7a86a05929700c9cd690;hb=67722b312390cdab29c076c912e14bd739c5c0f6#l83
Example:
```
[ 17.102002] systemd-udevd[282]: sdf: '/usr/bin/systemd-run -r --no-block --property DefaultDependencies=no --unit lvm-activate-iscsi_lvm2212 /usr/bin/lvm vgchange -aay --nohints iscsi_lvm2212'(err) 'Running as unit: lvm-activate-iscsi_>
[ 17.102522] systemd-udevd[282]: sdf: Process '/usr/bin/systemd-run -r --no-block --property DefaultDependencies=no --unit lvm-activate-iscsi_lvm2212 /usr/bin/lvm vgchange -aay --nohints iscsi_lvm2212' succeeded.
[ 17.102697] systemd-udevd[282]: sdf: Adding watch on '/dev/sdf'
[ 17.104944] systemd[1]: lvm-activate-iscsi_lvm2212.service: Changed dead -> running
...
[ 17.105434] systemd[1]: Started /usr/bin/lvm vgchange -aay --nohints iscsi_lvm2212.
[ 17.105601] systemd[931]: lvm-activate-iscsi_lvm2212.service: Executing: /usr/bin/lvm vgchange -aay --nohints iscsi_lvm2212
...
[ 17.420228] testsuite-64.sh[268]: + systemctl -q is-active lvm-activate-iscsi_lvm2212.service
[ 17.420228] testsuite-64.sh[268]: + return 0
[ 17.420228] testsuite-64.sh[268]: + test -e /dev/disk/by-path/ip-127.0.0.1:3260-iscsi-iqn.2021-09.com.example:iscsi.lvm.test-lun-4
[ 17.420228] testsuite-64.sh[268]: + udevadm settle
[ 17.420228] testsuite-64.sh[268]: + test -e /dev/iscsi_lvm2212/mypart1
...
[ 17.451313] systemd[1]: testsuite-64.service: Main process exited, code=exited, status=1/FAILURE
[ 17.451475] systemd[1]: testsuite-64.service: Failed with result 'exit-code'.
...
[ 17.555759] systemd[1]: Starting End the test...
[ 17.556972] sh[941]: + systemctl poweroff --no-block
...
[ 17.688923] lvm[931]: 2 logical volume(s) in volume group "iscsi_lvm2212" now active
...
[ 17.838484] systemd[1]: lvm-activate-iscsi_lvm2212.service: Child 931 belongs to lvm-activate-iscsi_lvm2212.service.
[ 17.838718] systemd[1]: lvm-activate-iscsi_lvm2212.service: Main process exited, code=exited, status=0/SUCCESS (success)
```
