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When reporting explicitly label attributes (pv_uuid for example), we do not
need to read metadata.
This patch separate the label fileds and removes scan_vgs_for_pvs
in process_each_pv() if not needed.
(There should be no user visible change in output.)
In libdm, we only ever use 'fields', while the tools use 'options' and
'fields' interchangeably.
Ideally it would be good to use 'fields' consistently everywhere.
However, 'options' most likely comes from the tool commandline '-o' and
'--options' which cannot be changed.
We display '0' for these fields now in this case. Ideally these values are
undefined for an orphan PV but today there is no way to specify undefined
with display functions such as _size64_disp().
"test" never prints anything. Therefore, "return $(test ...)" is equivalent to
just "return;" which means success in sh (same as return 0). We can however,
thanks to set -e, use "test foo = bar" as an assertion.
PS: test a == b is invalid syntax. It is either = or -eq: = is textual and -eq
is numeric comparison.
For example in LVM2, "pv_all" gives all PV fields.
"seg_all" gives all LV segment fields.
"all" gives all fields of the final report type. I think this is more
useful than just adding the current prefix.
So "lvs -o seg_all" gives all the LV segment fields, whilst
"lvs --segments -o all" adds in LV and VG fields too.
"lvs -o all -O vg_name" has report type LVS+VGS so includes all LV and all
VG fields.
Reports the size of the smallest metadata area in a PV or a VG.
Useful to confirm pvcreate --metadatasize or pvmetadatasize setting in
/etc/lvm/lvm.conf file.
NOTE: Actual value in these fields will most always differ from that
given in pvcreate options due to rounding and alignment effects.
There is a rudimentary make file in place so people can build by hand
from 'LVM2/daemons/clogd'. It is not hooked into the main build system
yet. I am checking this in to provide people better access to the
source code.
There is still work to be done to make better use of existing code in
the LVM repository. (list.h could be removed in favor of existing list
implementations, for example. Logging might also be removed in favor
of what is already in the tree.)
I will probably defer updating WHATS_NEW_DM until this code is linked
into the main build system (unless otherwise instructed).
Checks added for DM device names to allow only names < DM_NAME_LEN,
otherwise a part of lengthy name would be silently ignored and could
cause confusion while using dmsetup. Also, the name should not contain
'/' character, if it is used in context of creating a new device
or renaming the existing one (because we do not consider full path
to devices, they do not exist in filesystem yet) and appropriate error
messages are shown.
