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A foreign VG should be silently ignored by a reporting/display
command like 'vgs'. If the reporting/display command specifies
a foreign VG by name on the command line, it should produce an
error message.
Scanning commands pvscan/vgscan/lvscan are always allowed to
read and update caches from all PVs, including those that belong
to foreign VGs.
Other non-report/display/scan commands always ignore a foreign
VG, or report an error if they attempt to use a foreign VG.
vgimport should always invalidate the lvmetad cache because
lvmetad likely holds a pre-vgexported copy of the VG.
(This is unrelated to using foreign VGs; the pre-vgexported
VG may have had no system_id at all.)
Add --foreign to the remaining reporting and display commands plus
vgcfgbackup.
Add a NEEDS_FOREIGN_VGS flag for vgimport to always set --foreign.
If lvmetad is being used with --foreign, scan foreign VGs (currently
implemented as a full PV scan).
Handle these things centrally in lvmcmdline.c.
Also allow lvchange and vgchange -an/-aln to deactivate any foreign
LVs that happen to be active if something went wrong.
Remember to set the system ID when creating a new VG in vgsplit.
When checking whether the system ID permits access to a VG, check for
each permitted situation first, and only then issue the appropriate
error message. Always issue a message for now. (We'll try to
suppress some of those later when the VG concerned wasn't explicitly
requested.)
Add more messages to try to ensure every return code is checked and
every error path (and only an error path) contains a log_error().
Add self-correction to vgchange -c to deal with situations where
the cluster state and system ID state are out-of-sync (e.g. if
old tools were used).
Move the lvm1 sys ID into vg->lvm1_system_id and reenable the #if 0
LVM1 code. Still display the new-style system ID in the same
reporting field, though, as only one can be set.
Add a format feature flag FMT_SYSTEM_ON_PVS for LVM1 and disallow
access to LVM1 VGs if a new-style system ID has been set.
Treat the new vg->system_id as const.
Allow cmd->unknown_system_id to be cleared during toolcontext
refresh.
Set a default value of "none" for global/system_id_source.
Allow local/system_id to be empty so it's not impossible for
a later config file to remove it.
In a file containing a system ID:
Any whitespace at the start of a line is ignored;
Blank lines are ignored;
Any characters after a # are ignored along with the #.
The system ID is obtained by processing the first line with
non-ignored characters.
If further lines with non-ignored characters follow, a warning is
issued.
Add WARNING messages if there are problems setting the requested
system ID.
Ban "localhost" as a prefix regardless of the system_id_source.
Use cmd->hostname instead of calling uname again.
Make system_id_source values case-insensitive (as with new settings like
log_debug_classes) and also accept machine-id to match the filename.
Require system ID to begin with an alphanumeric character.
Rename fn to make clear it's only validation for systemid
and always terminate result rather than imposing this on the caller.
In 2.02.99, _init_tags() inadvertently began to ignore the
dm_config_tree struct passed to it. "tags" sections are not
merged together, so the "tags" section in the main config file was
being processed repeatedly and other "tags" sections were ignored.
Dop unused value assignments.
Unknown is detected via other combination
(!linear && !striped).
Also change the log_error() message into a warning,
since the function is not really returning error,
but still keep the INTERNAL_ERROR.
Ret value is always set later.
The dev ext source must be reset for the dev_cache_get call
(which evaluates filters), not lvmcache_label_scan - so fix
original commit 727c7ff85d.
Also, add comments in _pvcreate_check fn explaining why
refresh filter and rescan is needed and exactly in which
situations.
We exclude some signatures from being wiped when using blkid wiping.
These are signatures which we simply overwrite. For example, the
LVM2_member signature which denotes a PV - if we call pvcreate on
existing PV, we just overwrite the PV header, no need to wipe it.
Previously, we counted such signatures as if they were wiped
and they were counted in the final number of wiped signatures
that _wipe_known_signatures_with_blkid fn returned in the "wiped"
output arg. Then the code checking this output arg could be
mislead that wiping happened while no wiping took place in real
and we could fire some code uselessly based on this information
(e.g. refreshing filters/rescanning - see also
commit 6b4066585f).
Before, we refreshed filters and we did full rescan of devices if
we passed through wiping (wipe_known_signatures fn call). However,
this fn returns success even if no signatures were found and so
nothing was wiped. In this case, it's not necessary to do the
filter refresh/rescan of devices as nothing changed clearly.
This patch exports number of wiped signatures from all the
wiping functions below. The caller (_pvcreate_check) then checks
whether any wiping was done at all and if not, no refresh/rescan
is done, saving some time and resources.
