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Show full chain of ancestors and descendants for snapshots
(both thick and thin - in case of thick, the "ancestor" field
is actually equal to "origin" field as snapshots can't be
chained for thick snapshots).
These fields display current state as it is, they do not
display any history! If the snapshot chain is broken in
the middle, we don't report the historical origin (this
is going to be a part of another patch and a different
set of fields or just a switch for existing fields to
show ancestors and descendants with history included).
For example:
(origin --> snapshot)
lvol1 --> lvol2 --> lvol3 --> lvol4
\
--> lvol5 --> lvol6 --> lvol7 --> lvol8
$ lvs -o name,pool_lv,origin,ancestors,descendants vg
LV Pool Origin Ancestors Descendants
lvol1 pool lvol2,lvol3,lvol4,lvol5,lvol6,lvol7,lvol8
lvol2 pool lvol1 lvol1 lvol3,lvol4,lvol5,lvol6,lvol7,lvol8
lvol3 pool lvol2 lvol2,lvol1 lvol4
lvol4 pool lvol3 lvol3,lvol2,lvol1
lvol5 pool lvol2 lvol2,lvol1 lvol6,lvol7,lvol8
lvol6 pool lvol5 lvol5,lvol2,lvol1 lvol7,lvol8
lvol7 pool lvol6 lvol6,lvol5,lvol2,lvol1 lvol8
lvol8 pool lvol7 lvol7,lvol6,lvol5,lvol2,lvol1
Scenario:
$ vgs -o+vg_mda_copies
VG #PV #LV #SN Attr VSize VFree #VMdaCps
fedora 1 2 0 wz--n- 9.51g 0 unmanaged
vg 16 9 0 wz--n- 1.94g 1.83g 2
$ lvs -o+read_ahead vg/lvol6 vg/lvol7
LV VG Attr LSize Pool Origin Data% Rahead
lvol6 vg Vwi-a-tz-- 1.00g pool lvol5 0.00 auto
lvol7 vg Vwi---tz-k 1.00g pool lvol6 256.00k
Before this patch:
$vgs -o vg_name,vg_mda_copies -S 'vg_mda_copies < unmanaged'
VG #VMdaCps
vg 2
Problem:
Reserved values can be only used with exact match = or !=, not <,<=,>,>=.
In the example above, the "unamanaged" is internally represented as
18446744073709551615, but this should be ignored while not comparing
field directly with "unmanaged" reserved name with = or !=. Users
should not be aware of this internal mapping of the reserved value
name to its internal value and hence it doesn't make sense for such
reserved value to take place in results of <,<=,> and >=.
There's no order defined for reserved values!!! It's a special
*reserved* value that is taken out of the usual value range
of that type.
This is very similar to what we have already fixed with
2f7f6932dc, but it's the other way round
now - we're using reserved value name in selection criteria now
(in the patch 2f7f693, we had concrete value and we compared it
with the reserved value). So this patch completes patch 2f7f693.
This patch also fixes this problem:
$ lvs -o+read_ahead vg/lvol6 vg/lvol7 -S 'read_ahead > 32k'
LV VG Attr LSize Pool Origin Data% Rahead
lvol6 vg Vwi-a-tz-- 1.00g pool lvol5 0.00 auto
lvol7 vg Vwi---tz-k 1.00g pool lvol6 256.00k
Problem:
In the example above, the internal reserved value "auto" is in the
range of selection "> 32k" - it shouldn't match as well. Here the
"auto" is internally represented as MAX_DBL and of course, numerically,
MAX_DBL > 256k. But for users, the reserved value should be uncomparable
to any number so the mapping of the reserved value name to its interna
value is transparent to users. Again, there's no order defined for
reserved values and hence it should never match if using <,<=,>,>=
operators.
This is actually exactly the same problem as already described in
2f7f6932dc, but that patch failed for
size field types because of incorrect internal representation used.
With this patch applied, both problematic scenarios mentioned
above are fixed now:
$ vgs -o vg_name,vg_mda_copies -S 'vg_mda_copies < unmanaged'
(blank)
$ lvs -o+read_ahead vg/lvol6 vg/lvol7 -S 'read_ahead > 32k'
LV VG Attr LSize Pool Origin Rahead
lvol7 vg Vwi---tz-k 1.00g pool lvol6 256.00k
When test suite is used from installed rpm package
we need to handle things better.
This patch is rather first approach - expecting few more
tweaks needed.
At this moment LVM_LOG_FILE_EPOCH with
LVM_EXPECTED_EXIT_STATUS properly deletes debug logs
only for real commands - support for lvm2 API does not yet
exists
By default these are empty strings, so the config settings
should be flagged as undefined, so they will be commented
out of the generated config. Otherwise, the lines:
thin_repair_options=""
cache_repair_options=""
in the dump output cause a warning when processed since
lvm doesn't want an empty string.
Also regenerate lvm.conf.in.
The specific config settings have been removed
from the lvm.conf(5) man page, and replaced with
a description of how to use lvm dumpconfig to
view the settings.
The sample lvm.conf and lvmlocal.conf files are now generated:
example.conf.base - initial ungenerated part of the file
example.conf.gen - generated portion from dumpconfig
example.conf.in - combination of .base and .gen files
example.conf - result of configure processing .in file
lvmlocal.conf.base - initial ungenerated part of the file
lvmlocal.conf.gen - generated portion from dumpconfig
lvmlocal.conf.in - combination of .base and .gen files
lvmlocal.conf - result of configure processing .in file
Do not edit the .in files, but edit config_settings.h
or the .base files, and then use 'make generate' to create
the new .in files.
- configure
with options
- make
creates tools/lvm
- make generate
uses tools/lvm to create example.conf.in and lvmlocal.conf.in
by combining .base files with dumpconfig output.
- configure
with same options as above
creates example.conf and lvmlocal.conf from .in files
With use_lvmetad=0, duplicate PVs /dev/loop0 and /dev/loop1,
where in this example, /dev/loop1 is the cached device
referenced by pv->dev, the command 'pvs /dev/loop0' reports:
Failed to find physical volume "/dev/loop0".
This is because the duplicate PV detection by pvid is
not working because _get_all_devices() is not setting
any dev->pvid for any entries. This is because the
pvid information has not yet been saved in lvmcache.
This is fixed by calling _get_vgnameids_on_system()
before _get_all_devices(), which has the effect of
caching the necessary pvid information.
With this fix, running pvs /dev/loop0, or pvs /dev/loop1,
produces no error and one line of output for the PV (the
device printed is the one cached in pv->dev, in this
example /dev/loop1.)
Running 'pvs /dev/loop0 /dev/loop1' produces no error
and two lines of output, with each device displayed
on one of the lines.
Running 'pvs -a' shows two PVs, one with loop0 and one
with loop1, and both shown as a member of the same VG.
Running 'pvs' shows only one of the duplicate PVs,
and that shows the device cached in pv->dev (loop1).
The above output is what the duplicate handling code
was previously designed to output in commits:
b64da4d8b5 toollib: search for duplicate PVs only when needed
3a7c47af0e toollib: pvs -a should display VG name for each duplicate PV
57d74a45a0 toollib: override the PV device with duplicates
c1f246fedf toollib: handle duplicate pvs in process_in_pv
As a further step after this, we may choose to change
some of those.
For all of these commands, a warning is printed about
the existence of the duplicate PVs:
Found duplicate PV ...: using /dev/loop1 not /dev/loop0
Rename envvar LVM_LOG_FILE_UNLINK_STATUS to LVM_EXPECTED_EXIT_STATUS
and change compare sign from '!' to '>'.
Validate LVM_LOG_FILE_EPOCH and support strictly only
up-to 32 alpha chars. If the content doesn't pass
epoch is simply ignored.
Enhance 'not' to manage autodeletion of log files in right cases.
Use separately marked epoch log files for clvmd and dmeventd.
Properly manage stack tracing for new debug.log names.
Add support for 2 new envvars for internal lvm2 test suite
(though it could be possible usable for other cases)
LVM_LOG_FILE_EPOCH
Whether to add 'epoch' extension that consist from
the envvar 'string' + pid + starttime in kernel units
obtained from /proc/self/stat.
LVM_LOG_FILE_UNLINK_STATUS
Whether to unlink the log depending on return status value,
so if the command is successful the log is automatically
deleted.
API is still for now experimental to catch various issue.
add info for various commits, most significant were:
- toollib: close connection to lvmetad after fork
(fe30658a4d)
- toollib: do not spawn polling in lv_change_activate
(c26d81d6e6)
- pvmove: split pvmove_update_metadata function
(65623b63a2)
- lvconvert: move poll code in before refactoring
(5190f56605)
- pvmove: move poll code in before refactoring
(a098aa419f)
--withfullcomments prints all comment lines for each config option.
--withcomments prints only the first comment line, which should be
a short one-line summary of the option.
Previous commit has made have_cache & have_thin producing
false return value.
Fix it and at the some time provide much better reconfiguring
warning message.
If the test machine is missing needed and configured binaries
it will produce TEST WARNING result.
When a var like LVM_TEST_THIN_CHECK_CMD is set to ""
(which is valid) we need to correctly use '-'.
Otherwise ':-' replaces such value with built-in default.
