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If using lv/vgchange --sysinit -aay and lvmetad is enabled, we'd like to
avoid the direct activation and rely on autoactivation instead so
it fits system initialization scripts.
But if we're calling lv/vgchange --sysinit -aay too early when even
lvmetad service is not started yet, we just need to do the direct
activation instead without printing any error messages (while
trying to connect to lvmetad and not finding its socket).
This patch adds two helper functions - "lvmetad_socket_present" and
"lvmetad_used" which can be used to check for this condition properly
and avoid these lvmetad connections when the socket is not present
(and hence lvmetad is not yet running).
fmt1 doesn't have a separate commit function: updates take effect
immediately vg_write is called, so we must update lvmetad at this
point if we're going to go on and ask lvmetad for the VG metadata
again before calling the commit function (though that's probably an
unsupported and pointless thing to do anyway as the client must
already have that data and it cannot have changed because it's locked
and with devs suspended we shouldn't be communicating with lvmetad;
so when that's fixed properly, this fix here can be reverted).
This problem showed up as an internal error when lvremoving an LVM1
snapshot.
> Internal error: LV snap1 (00000000000000000000000000000001) missing from preload metadata
https://bugzilla.redhat.com/891855
Rename lvmetad_warning() to lvmetad_connect_or_warn().
Log all connection attempts on the client side, whether successful or not.
Reduce some nesting and remove a redundant assertion.
Calling pvscan --cache with -aay on a PV without an MDA would spuriously fail
with an internal error, because of an incorrect assumption that a parsed VG
structure was always available. This is not true and the autoactivation handler
needs to call vg_read to obtain metadata in cases where the PV had no MDAs to
parse. Therefore, we pass vgid into the handler instead of the (possibly NULL)
VG coming from the PV's MDA.
We were using daemon_send_simple until now, but it is no longer adequate, since
we need to manipulate requests in a generic way (adding a validity token to each
request), and the tree-based request interface is much more suitable for this.
Define an 'activation_handler' that gets called automatically on
PV appearance/disappearance while processing the lvmetad_pv_found
and lvmetad_pv_gone functions that are supposed to update the
lvmetad state based on PV availability state. For now, the actual
support is for PV appearance only, leaving room for PV disappearance
support as well (which is a more complex problem to solve as this
needs to count with possible device stack).
Add a new activation change mode - CHANGE_AAY exposed as
'--activate ay/-aay' argument ('activate automatically').
Factor out the vgchange activation functionality for use in other
tools (like pvscan...).
Add 3rd daemon return state "unknown" for lookups that are carried out
successfully but don't find the item requested.
Avoid issuing error messages when it's expected that a device that's
being looked up in lvmetad might not be there.
Hold global lock in pvscan --lvmetad. (This might need refinement.)
Add PV name to "PV gone" messages.
Adjust some log message severities. (More changes needed.)
