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Previously, vgcfgrestore would attempt to vg_remove the
existing VG from lvmetad and then vg_update to add the
restored VG. But, if there was a failure in the command
or with vg_update, the lvmetad cache would be left incorrect.
Now, disable lvmetad before the restore begins, and then
rescan to populate lvmetad from disk after restore has
written the new VG to disk.
This uses the vg->pv_write_list in place of the
vg->pvs_to_write list, and eliminates the use of
pvcreate_params. The label remove and zeroing
steps are shifted out of vg_write() to the higher
level like pvcreate will do.
The backup_restore_vg is used directly for restoring the VG from backup.
It's also used to do the VG conversions from one metadata format to
another which means vgconvert calls backup_restore_vg too.
When restoring VG from backup, we need to rewrite/write PV headers as
PVs may have been orphans before and now they're becoming part of some
VG - we need to write the PV_EXT_USED flag at least.
When using the backup_restore_vg for vgconvert, we need to write
completely new PV header in different format.
Avoid the special "pv_write" call and handling that was used before
this patch in vgconvert (vgconvert_single function to be more precise)
and reuse existing internal interface to register PV header for writing
(or rewriting) via vg->pvs_to_write list instead like we do it elsewhere
in the code.
This patch also resolves a problem in which PV headers with target
format were written in the vgconvert_single fn as orphans and VG
metadata were added later on - this was a tiny hack actually.
We can't do this now - we need to write the PV as belonging
to a VG because otherwise the PV_EXT_USED flag won't be written
properly (if the PV header is written as orphan, the PV_EXT_USED
is set to 0, of course, even though metadata are attached later).
So this patch removes this tiny inconsistency which was passing
just fine before because we didn't have any relation to the VG
in PV header before. Now we have the PV_EXT_USED flag which says
the "PV is used in some VG".
Allow restoring metadata with thin pool volumes.
No validation is done for this case within vgcfgrestore tool -
thus incorrect metadata may lead to destruction of pool content.
Run backup of metadata on remote nodes in the
same place like local node - when calling backup().
Introduce backup_locally() which calls only
local backup if needed.
Remote backup is now trigerred by LCK_VG_BACKUP flag
combination (special VG lock).
This lock type will call check_current_backup()
(including backup_locally() call) and updates
metadata on all nodes.
(Patch fixes non-functional remote backup,
current call during VG lock never triggers.)
Identical argument to previous patch which removed archive_enable() calls.
We add a new parameter to backup_init() which sets the enable value based
on the cmd->default_settings.backup value. This value was used to set
cmd->current_settings.backup, used in the removed backup_enable() call.
_init_backup() calls archive_init(), which originally set 'enabled' to
a hardcoded '1' value. This seems incorrect based on my read of other
areas of the code so here we add a 'enabled' paramter to archive_init().
We pass in cmd->default_settings.archive, which is obtained from the
config tree. Later in create_toolcontext, cmd->current_settings is
set to cmd->default_settings. The archive_enable() call we remove
here was using cmd->current_settings to set the 'archive' enable
value. The final value of cmd->archive_params->enabled should thus
be equivalent to the original code.
