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Use new 3rd. state of trace_pvmove_deps == 2.
In this state we know, we have already seen the node and can skip futher
testing. Remainging value 1 signals we want to track, and value 0
is for ignoring tracking, but node is still checking in this case.
Reduces large amount of duplicate ioctl queries.
Check also all snapshosts when resume is requested,
the origin volume is already resume, but possibly
some subLV or snapshot LV could be suspended if
we are still in critical_section.
When entering any critical section, lvm2 used to lock process memory
and raised task priority to avoid problem with page swapping and minimize
time of having non-resumed devices in table.
With this patch, memory locking which which is expensive is only used when
entering 'suspending' section as only in this section there is risk
lvm could be suspending a device which later can be needed for paging.
Raised priority is still kept for all section entrances as this is
low-cost operation and may accelerate table resumes - although the real
impact can be still considered later.
When pvmove is finished and metadata are updated, the code missed
to merge possible mergable segments - so add explicit merging
call after pvmoved volumes are unlocked.
This avoids weird results where i.e. lvs could have been reporting
non-matching segments as lvs upon metadata read is doing silent segment
merging while dm table left after pvmove was still preserving
non-merged segments.
When large size number (>2^31) is given on command line it could be
misdetected and in certain cases lead to wrongly casted number.
So make sure all cases always do set _MAX number in case the value would
not fit within the supported range instead of getting some random value
within the range.
In most cases this was not a problem to detect, but i.e. stripesize
parameter might have been fooled by certain large numbers.
Rewrite validation of stripes and stripe_size args into more readable
sequential code.
Extend reading of stripes & stripes_size args so it better knows
defaults for types like striped raid.
TODO: this should really be a value obtained for segtype structure and
all the weird conditions and modification of stripes and stripe_size
around lvm2 code should be dropped.
ATM we want to support delayed resume purely in pvmove case.
So have libdm logic internal to recognize difference beween
pvmove and other targets that do use delayed resume.
This fixes problem introduced with commit aa68b898ff
for mirror-on-mirror or snapshot-on-mirror problem.
TODO: likely added new API call and let libdm user select
delayed nodes explicitely.
Use code which detectes handlers in a way, which is more
backward-compatible friendly.
Replace read of 'sysfs' uuid entry with dm ioctl call.
Use /sys/block/dm-X/holders path instead of
new path /sys/dev/block/major:minor/holders.
TODO:
There are few more occurencies of this logic around the code
so some abstract interface should be considered.
In some cases the message could be slightly misleading so use
here rather conditional.
TODO:
In future we may possibly further tune the message in case we are
certain the level of redundancy protection has not been reduced.
When pvmove is finished and does 'suspend/resume' on PVMOVE LV,
on resume path committed metadata are already showing 'standalone'
pvmove LV prepared just for removal.
However code should be able to 'resume' preloaded LV there were
participating in pvmove operation.
Previously this was all done in the 'tools' part of lvm2 code.
So the lvconvert upon pvmove finish had to explicitely call 'resume' on every such LV.
Now 'smarted' activation code is able to deduce and combine all information from
the active dm table and committed metadata so single call resolves
it all in one go.
Internally holders are detected by reading sysfs directory to capture
all needed UUID which are then looked in lvm2 metadata and all such
LVs are automatically collected into dmtree.
Replace complex code with standard lv_update_and_reload_origin().
Extra suspend should not be necessary.
(If they would be - dependency tree would have bug for fixing).
Propagate delayed resume at least for preload case in a simple way.
Currently PVMOVE depends on internal logic where 'mirror' with
corelog is 'possible' PVMOVE. In such case resume of 'created'
node is 'delayed'.
This is mostly an ugly internal hack - but for the moment being when we
add propagation for preload - it does work reasonable.
TODO: provide standard API and avoid this internal 'guessing'.
Only thin-pool with origin_only suspend is allowed to be not suspending anything.
In such case pairing resume will 'decrement' critical section counter.
Just like suspend handles preload for pvmove finish,
in similar way handle suspend of starting pvmove.
In this case the precommited metadata are checked for list of PVMOVEed
LVs and those are suspended in with committed metadata.
When sanlock or dlm lock managers return an error number
that we don't recognize, replace it with a generic -ELMERR
which is defined in the set of special lvmlockd error
numbers. Otherwise, an unknown lock manager error number
could be misinterpreted for something else if it happened
to overlap another set of error numbers (which they have
not thus far.)
These less common errors returned from sanlock should
also cause sanlock to retry the lock acquire:
- i/o timeout occurs during sanlock_acquire().
other i/o on the same disk as the leases can cause
sanlock i/o timeouts.
- low level disk paxos contention between hosts naturally
causes one host to not acquire the lease. There are a
couple special error numbers associated with these cases
that should just be recognized as a normal failure to
acquire the lease.
There is no need to differentiation between clustered VG and normal VG.
As the activation depends on locking type.
Use unconditionally locally exclusive activation for pvmove.
Whenever pvmove tree is going to be generated for suspend
and such LV has a user - use this 'using LV' to generate
correct dm tree holding all components.
LV is asked for resume, and its already resume and tool
is inside 'critical_section()' check if there is any suspended sub LV.
In that case 'resume' operation will not be skipped.
When activation of LVs fails prior pvmove start, try to deactivate
already activated LVs.
TODO: possibly remember which LVs where already activate and only those
take down - devices which are already in-use will stay active.
