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There are numerous issues for --grow --continue in switchroot phrase,
they include:
* Events being missed for restarting grow-continue service. This is
apparent mostly on OS on RAID scenarios. When a checkpoint (next step)
is committed, we have no reliable way to gracefully stop reshape until
it reaches that checkpoint. During boot, there's heavy I/O utilisation,
which causes sync speed drop, and naturally checkpoint takes longer to
reach. This further causes systemd to forcefully kill grow-continue
service due to timeouts, which results in udev event being missed for
grow-continue service restart.
* Grow-continue (seemingly) was not designed to be restarted without
reassembly, some things like stopping chunksize (to lower) migration
were straight up not working until recently.
This patch makes grow-continue (actual reshape) start after switchroot
phrase. This way we should not encounter issues related to restarting
the service.
Add checks not start a reshape if in initrd, let it initialise only.
Change grow-continue udev rule to be triggered whenever there's a
reshape happening in metadata, rely on udev event to kick reshape after
switchroot. Add handle_forking helper function for reshapes to avoid
duplicating code.
Signed-off-by: Mateusz Kusiak <mateusz.kusiak@intel.com>
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Display if there's an ongoing reshape happening in mdadm --detail
--export output.
This change is needed for incoming patches that will change "grow
continue" udev rules, to be based on actual array state.
Signed-off-by: Mateusz Kusiak <mateusz.kusiak@intel.com>
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This commit removes --freeze-reshape logic, it basicaly reverts
commit b76b30e0f950 ("Do not continue reshape during initrd phase").
--freeze-reshape was supposed to be used to restore critical sector in
incremental and assemble operations without starting a reshape process,
but it's meaning has been lost through the years and it is not
currently used.
A replacement for this logic will be added in incoming patches, so
reshapes won't be started in initrd phrase.
Signed-off-by: Mateusz Kusiak <mateusz.kusiak@intel.com>
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Remove external bitmap support from manual.
Signed-off-by: Mariusz Tkaczyk <mtkaczyk@kernel.org>
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