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3399a30ee0
This had always worked in my testing, but a user on hardware reported
this to happen 100%, and I reproduced it once with cold VM host caches.
dracut-zfs-generator runs as a systemd generator, i.e. at Some
Relatively Early Time; if root= is a fixed dataset, it tries to
"solve [necessities] statically at generation time".
If by that point zfs-import.target hasn't popped (because the import is
taking a non-negligible amount of time for whatever reason), it'll see
no children for the root datase, and as such generate no mounts.
This has never had any right to work. No-one caught this earlier because
it's just that much more convenient to have root=zfs:AUTO, which orders
itself properly.
To fix this, always run zfs-nonroot-necessities.service;
this additionally simplifies the implementation by:
* making BOOTFS from zfs-env-bootfs.service be the real, canonical,
root dataset name, not just "whatever the first bootfs is",
and only set it if we're ZFS-booting
* zfs-{rollback,snapshot}-bootfs.service can use this instead of
re-implementing it
* having zfs-env-bootfs.service also set BOOTFSFLAGS
* this means the sysroot.mount drop-in can be fixed text
* zfs-nonroot-necessities.service can also be constant and always
enabled, because it's conditioned on BOOTFS being set
There is no longer any code generated at run-time
(the sysroot.mount drop-in is an unavoidable gratuitous cp).
The flow of BOOTFS{,FLAGS} from zfs-env-bootfs.service to sysroot.mount
is not noted explicitly in dracut.zfs(7), because (a) at some point it's
just visual noise and (b) it's already ordered via d-p-m.s from z-i.t.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #14690
43 lines
1.2 KiB
Bash
Executable File
43 lines
1.2 KiB
Bash
Executable File
#!/bin/sh
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# shellcheck disable=SC2016,SC1004,SC2154
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grep -wq debug /proc/cmdline && debug=1
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[ -n "$debug" ] && echo "zfs-generator: starting" >> /dev/kmsg
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GENERATOR_DIR="$1"
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[ -n "$GENERATOR_DIR" ] || {
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echo "zfs-generator: no generator directory specified, exiting" >> /dev/kmsg
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exit 1
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}
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# shellcheck source=zfs-lib.sh.in
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. /lib/dracut-zfs-lib.sh
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decode_root_args || exit 0
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[ -n "$debug" ] && echo "zfs-generator: writing extension for sysroot.mount to $GENERATOR_DIR/sysroot.mount.d/zfs-enhancement.conf" >> /dev/kmsg
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mkdir -p "$GENERATOR_DIR"/sysroot.mount.d "$GENERATOR_DIR"/dracut-pre-mount.service.d
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{
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echo "[Unit]"
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echo "Before=initrd-root-fs.target"
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echo "After=zfs-import.target"
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echo
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echo "[Mount]"
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echo "PassEnvironment=BOOTFS BOOTFSFLAGS"
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echo 'What=${BOOTFS}'
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echo "Type=zfs"
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echo 'Options=${BOOTFSFLAGS}'
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} > "$GENERATOR_DIR"/sysroot.mount.d/zfs-enhancement.conf
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ln -fs ../sysroot.mount "$GENERATOR_DIR"/initrd-root-fs.target.requires/sysroot.mount
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{
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echo "[Unit]"
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echo "After=zfs-import.target"
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} > "$GENERATOR_DIR"/dracut-pre-mount.service.d/zfs-enhancement.conf
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[ -n "$debug" ] && echo "zfs-generator: finished" >> /dev/kmsg
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exit 0
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