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Since cached LV is going to be removed together with its cache,
there is not much to gain if we try to flush cache first.
User may use 'vgcfgrestore' to get back origin + cache.
Assuming user is not using issue_discards.
When data are discarded after remove there is nothing to restore!
This change allows to futher reduce number of commits
during lvremove/vgremove.
This modification supports dynamically obtaining the value of PAGE_SIZE,
which is compatible with systems with PAGE_SIZE of (4K/64K)
Signed-off-by: wuguanghao <wuguanghao3@huawei.com>
There is really no practical reason to continue running
when we fail on allocation.
It seems we may need further fine frained errors, as for
some error type we simply need to exit ASAP, while
others may still produce usable results.
When lvremove/vgremove removes thin volumes with its thin-pool as well,
try to skip any updates of such thin-pool, so when everything properly
deactivates, there is no message send to this thin-pool and whole
thin-pool is removed with a single commit.
When generating list of processed LV, add thin-pool to the head of the
list, while other LVs are added on tail.
This makes it easier when removing many thin volumes, to recognize easily
when its thin-pool is also supposed to be removed.
Returning NULL for lv_committed is basically instant crash,
so instead try with passed LV instead.
It shouldn't matter as this is internall error path anyway,
but coverity should be happier.
Another step towards better automatic handling of backup,
and automatically setup needs_backup after commit.
In some next step we should reduce number of backups and takem
then only at the command finish with vg_committed content.
The correct test needs to actually check 'lv->snapshot' is not NULL,
so the 'find_snapshot()' can work.
Test lv_is_snapshot was actually irrelavant for this case.
Also initialize device_id.
With commit b44db5d1a7
needs to check allocated pointer for failed malloc().
Existing check was actually no checking anything so failing
malloc here would result in segfault (although with very
low chance to ever happen).
Match VG uuid just once per list of all LVs in VG.
TODO: maybe some more efficeint tree or hash could be better here,
but since it's used not so often, the total benefit is not so great,
so ATM just reducing amount of checked bytes.
