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Add thin and thin pool lv creation support to lvm library
This is Mohan's thinp patch, re-worked to include suggestions
from Zdenek and Mohan.
Rework of commit 4d5de8322b
which uses refactored properties handling.
Based on work done by M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Tony Asleson <tasleson@redhat.com>
The common bits from lib/report/properties.[c|h] have
been moved to lib/properties/prop_common.[c|h] to allow
re-use of property handling functionality without
polluting the report handling functionality.
Signed-off-by: Tony Asleson <tasleson@redhat.com>
- lvs -o lv_attr has now 10 indicator bits
- use '--ignoremonitoring' instead of the shortcut '--ig' used before (since
it would be ambiguous with new '--ignoreactivationskip')
The activation/auto_set_activation_skip enables/disables automatic
adding of the ACTIVATION_SKIP LV flag. By default thin snapshots
are flagged to be skipped during activation.
And by default, the auto_set_activation_skip is enabled.
The lvchange has both -k/--setactivationskip and
-K/--ignoreactivationskip option available for use.
The vgchange has only -K/--ignoreactivationskip, but
not the -k/--setactivationskip as the ACTIVATION_SKIP
flag is an LV property, not a VG one and so we change it
only by using the lvchange...
Also add -k/--setactivationskip y/n and -K/--ignoreactivationskip
options to lvcreate.
The --setactivationskip y sets the flag in metadata for an LV to
skip the LV during activation. Also, the newly created LV is not
activated.
Thin snapsots have this flag set automatically if not specified
directly by the --setactivationskip y/n option.
The --ignoreactivationskip overrides the activation skip flag set
in metadata for an LV (just for the run of the command - the flag
is not changed in metadata!)
A few examples for the lvcreate with the new options:
(non-thin snap LV => skip flag not set in MDA + LV activated)
raw/~ $ lvcreate -l1 vg
Logical volume "lvol0" created
raw/~ $ lvs -o lv_name,attr vg/lvol0
LV Attr
lvol0 -wi-a----
(non-thin snap LV + -ky => skip flag set in MDA + LV not activated)
raw/~ $ lvcreate -l1 -ky vg
Logical volume "lvol1" created
raw/~ $ lvs -o lv_name,attr vg/lvol1
LV Attr
lvol1 -wi------
(non-thin snap LV + -ky + -K => skip flag set in MDA + LV activated)
raw/~ $ lvcreate -l1 -ky -K vg
Logical volume "lvol2" created
raw/~ $ lvs -o lv_name,attr vg/lvol2
LV Attr
lvol2 -wi-a----
(thin snap LV => skip flag set in MDA (default behaviour) + LV not activated)
raw/~ $ lvcreate -L100M -T vg/pool -V 1T -n thin_lv
Logical volume "thin_lv" created
raw/~ $ lvcreate -s vg/thin_lv -n thin_snap
Logical volume "thin_snap" created
raw/~ $ lvs -o name,attr vg
LV Attr
pool twi-a-tz-
thin_lv Vwi-a-tz-
thin_snap Vwi---tz-
(thin snap LV + -K => skip flag set in MDA (default behaviour) + LV activated)
raw/~ $ lvcreate -s vg/thin_lv -n thin_snap -K
Logical volume "thin_snap" created
raw/~ $ lvs -o name,attr vg/thin_lv
LV Attr
thin_lv Vwi-a-tz-
(thins snap LV + -kn => no skip flag in MDA (default behaviour overridden) + LV activated)
[0] raw/~ # lvcreate -s vg/thin_lv -n thin_snap -kn
Logical volume "thin_snap" created
[0] raw/~ # lvs -o name,attr vg/thin_snap
LV Attr
thin_snap Vwi-a-tz-
...when creating config trees while calling config_def_create_tree fn
that constructs a tree out of config_settings.h definition
(CFG_DEF_TREE_NEW/MISSING/DEFAULT/PROFILABLE).
Normally, the lvm dumpconfig processes only the configuration tree
that is at the top of the cascade. Considering the cascade is:
CONFIG_STRING -> CONFIG_PROFILE -> CONFIG_MERGED_FILES/CONFIG_FILE
...then:
(dumpconfig of lvm.conf only)
raw/~ $ lvm dumpconfig allocation
allocation {
maximise_cling=1
mirror_logs_require_separate_pvs=0
thin_pool_metadata_require_separate_pvs=0
thin_pool_chunk_size=64
}
(dumpconfig of selected profile configuration only)
raw/~ $ lvm dumpconfig --profile test allocation
allocation {
thin_pool_chunk_size=8
thin_pool_discards="passdown"
thin_pool_zero=1
}
(dumpconfig of given --config configuration only)
raw/~ $ lvm dumpconfig --config 'allocation{thin_pool_chunk_size=16}' allocation
allocation {
thin_pool_chunk_size=16
}
The --mergedconfig option causes the configuration cascade to be
merged before processing it with dumpconfig:
(dumpconfig of merged selected profile and lvm.conf)
raw/~ $ lvm dumpconfig --profile test allocation --mergedconfig
allocation {
maximise_cling=1
thin_pool_zero=1
thin_pool_discards="passdown"
mirror_logs_require_separate_pvs=0
thin_pool_metadata_require_separate_pvs=0
thin_pool_chunk_size=8
}
(dumpconfig merged given --config and selected profile and lvm.conf)
raw/~ $ lvm dumpconfig --profile test --config 'allocation{thin_pool_chunk_size=16}' allocation --mergedconfig
allocation {
maximise_cling=1
thin_pool_zero=1
thin_pool_discards="passdown"
mirror_logs_require_separate_pvs=0
thin_pool_metadata_require_separate_pvs=0
thin_pool_chunk_size=16
}
Hence with the --mergedconfig, we are able to see the
configuration that is actually used when processing any
LVM command while using any combination of --config/--profile
options together with lvm.conf file.
Till now, we needed the config tree merge only for merging
tag configs with lvm.conf. However, this type of merging
did a few extra exceptions:
- leaving out the tags section
- merging values in activation/volume_list
- merging values in devices/filter
- merging values in devices/types
Any other config values were replaced by new values.
However, we'd like to do a 'raw merge' as well, simply
bypassing the exceptions listed above. This will help
us to create a single tree representing the cascaded
configs like CONFIG_STRING -> CONFIG_PROFILE -> ...
The reason for this patch is that when trees are cascaded,
the first value found while traversing the cascade is used,
not making any exceptions like we do for tag configs.
When CFG_DEF_TREE_MISSING is created, it needs to know the status
of the check done on the tree used (the CFG_USED flag).
This bug was introduced with f1c292cc38
"make it possible to run several instances of configuration check at
once". This patch separated the CFG_USED and CFG_VALID flags in
a separate 'status' field in struct cft_check_handle.
However, when creating some trees, like CFG_DEF_TREE_MISSING,
we need this status to do a comparison with full config definition
to determine which items are missing and for which default values
were used. Otherwise, all items would be considered missing.
So, pass this status in a new field called 'check_status' in
struct config_def_tree_spec that defines how the (dumpconfig) tree
should be constructed (and this struct is passed to
config_def_create_tree fn then).
Start separating the validation from the action in the basic lvresize
code moved to the library.
Remove incorrect use of command line error codes from lvresize library
functions. Move errors.h to tools directory to reinforce this,
exporting public versions of the error codes in lvm2cmd.h for dmeventd
plugins to use.
Update code to match lvm coding standards
Disable/skip test - since it's accessing VGs available in the system.
Before reenable - validate it's not touching any PV outside those
created during test.
Condition needs to check for passed in pool_metadata_lv_name
which needs to be renamed to _tmeta, for !pool_metadata_lv_name
it's already created with correct _tmeta name.
The idea of using 'eprefix' unfortunatelly fails on /usr moved distros.
But there is also default --sysconfdir which is normaly set to /etc.
If unset it's PREFIX/etc.
For now revert.
FIXME: replace lvm vars with standard ones everyone is using.
Document following items:
configuration cascade (man lvm.conf)
--profile ProfileName (man lvm)
--detachprofile (man vgchange/lvchange)
-o vg_profile/lv_profile (man vgs/lvs)
Also document --config a bit so we can see where it fits in the
configuration cascade - will be documented more in following commit...
Fix and improve handling on sigint.
Always check for signal presence *before* calling of command,
so it will not call the command when break was hit.
If the command has been finished succesfully there is
no problem to mark the command ok and not report interrupt at all.
Fix cuple related stack; reports and assignments.
Seems like we have a bit overcomplicated set of options
for deducing individual install dirs.
This patch fixes installation issues with DESTDIR,
but the whole set of configure options should be simplified.
