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The call to dm_stats_walk_start() before the do statement makes
dm_stats_walk_do() behave inconsistently depending on context;
wrap them in an additional do { } while (0) so that the macro
always expands to a valid statement.
The code could perform this conversion but ironically
did not recognize the standard command form, only the
the unpreferred "implication-based" command form.
"lvconvert --type linear VG/RaidLV" would fail, but
"lvconvert --mirrors 0 VG/RaidLV" would succeed.
The code could perform this conversion but ironically
did not recognize the standard command form, only the
the unpreferred "implication-based" command form.
"lvconvert --type linear VG/MirrorLV" would fail, but
"lvconvert --mirrors 0 VG/MirrorLV" would succeed.
If after extracting stats arguments and group tags nothing remains
of aux_data but '-' set the region->aux_data field to the empty
string to match behaviour for non-grouped regions.
Although not harmful do not allow a group containing regions with
histograms since it is not currently possible to present histogram
data aggregated for the group.
Although a non-zero value for the number of ticks spent doing IO
should imply a non-zero number of IOs in the interval test for
this explicitly to avoid a divide-by-zero in the event of bad
counter data.
It's possible for interval_ns to be zero if the interval is not
set or the clock is misconfigured. Test for this before using the
value as the divisor in the utilisation calculation.
Walk flags are ULL constants; cast the result to a uint64_t before
logging with a FMTx64 format specifier to avoid a compiler warning:
warning: format ‘%lx’ expects argument of type ‘long unsigned int’,
but argument 5 has type ‘long long unsigned int’
Make it clear that the "aux data" presented in reports is the user
data stored in the field (and does not include any library-internal
state such as group descriptors) by renaming the field to user_data
and changing the heading to "UserData".
Make it clear in libdevmapper.h, and in function argument names, that
libdm-stats uses the aux_data field internally and that any values set
for user_data are appended to the library values before being stored
with a region, and similarly, that internal data fields will be stripped
prior to returning any previously stored user_data.
Replace --statstype=area,region,group with a separate switch for
each object type: --area, --region, --group. Omitting any object
type switch will use the defaults for the current command (regions
and groups for list, and regions, groups and areas for verbose list).
Replace the 'name' field with 'statsname' in order to report alias
names for groups, and include the 'group_id' field between statsname
and the 'region_id' field to make it clear to the user when groups
are in use.
Walk avaiable groups and regions (in addition to areas) and report
aggregate statistics and properties.
A new switch is added to filter the type of obects inclued in the
report:
--statstype={all,area,region,group}
The type of the current row is also available in a new
DR_STATS_META field 'type'.
To allow the names used to describe statistics report objects to
change (for e.g to support groups and region and group aliases)
introduce a new "stats_name" field that evaluates to the correct
name for the object being reported.
Add a pair of commands to create and delete stats groups:
dmstats group --regions REGIONS
dmstats ungroup --groupid ID
REGIONS specifies a list of regions to be included in the group.
Regions are specified as a comma separated list in order of
increasing region ID. Ranges may be specified as a hypen separated
pair of values giving the first and last member of the range.
