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This reverts commit 70db1d523d.
Since we use 'strncpy' even for case where it exactly matches
the buffer size and \0 is not expected to be added there.
Before printing a commented automatic config value,
print a line describing what it is. Otherwise, the
commented value can look like it's a part of an
example preceding it.
The timerfd guarantees that it will return 8 bytes when a read(2)
is issued (a uint64_t giving the number of timer events during the
call). Check that it does so and log a non-fatal error if the byte
count is not 8.
Several interfaced in libdm-stats return a uint64_t when it is
only used to signal success/failure: change all these uses to
return a simple int instead.
Move code which runtime detects settings for cache_policy
out of config dir to cache seg handling code.
Also mark cache_mode as command profilable setting.
Revert back to already existing behavior which has been slightly
modified by a900d150e4.
At the end however it seem to be equal to change TID right with first
metadata write.
Existing code missed handling for 'unused' thin-pool which would
require to also check empty message list for TID==0.
So with the fix we now again preserve 'active' thin-pool volume
when first thin volume is created - this property was lost and caused
problems in cluster, where the lock was hold, but volume was no longer
active on the node.
Another missing part was the proper support for already increased,
but unfinished TID change.
So going back here with existing logic -
TID is increased with first MDA update.
Code allows start with either same TID or (TID-1).
If there are messages, TID must be lower by 1 for sending,
otherwise messages were already posted.
As cache_policy is evaluated in runtime, we no longer should use
CFG_COMMENTED, but have to switch to CFG_UNDEFINED.
So as long as the value is undefined, it's runtime evaluated.
Once it's set - it's always respected (no runtime fallback).
Also fix version of introduced settings to 2.2.128.
Commit f10ad95 introduced a regression causing the size of regions
passed in on the command line to be truncated to zero. Initialise
the 'this_len' variable to the supplied length to correct this.
Commit f10ad95 introduced a regression in the calculation of the
number of areas in a region created with the --areasize switch:
vg_hex-lv_home: Created new region with 0 area(s) as region ID 1
vg_hex-lv_swap: Created new region with 0 area(s) as region ID 1
Fis this by using the correct region size when calculating the
value.
When dmstats is run with -v or higher enable a per-area reporting
mode for statistics regions. This will output one row per area
(rather than one row per region) and adds additional fields of use
when viewing areas:
area_id - index within the region assigned by libdm-stats
area_start - the start location of the area in the containing
device.
Add a method to retrieve the offset of an area within the
containing region (rather than the offset within the containing
device returned by dm_stats_get_area_start()).
Although users of the library can calculate this themselves it is
better to provide this through a method call to avoid users making
assumptions about the structure of regions and areas.
The dm_stats_get_area_start (and its '_current_' variant) methods
are expected to return the start sector of the area in the
containing device.
Make sure the call adds region->start to the returned value.
Add a '--raw' switch to stats reports that causes us to report the
basic counter values rather than derived metrics for each visible
statistics region.
Add prefixes to all dmsetup report types to allow the 'group_all'
option to be effective:
DR_NAME name_
DR_INFO info_
DR_DEPS deps_
DR_TREE tree_
DR_NAME splitname_
When run with full verbosity dmsetup or dmstats reports will
output a figure that tracks a moving average over a window of the
last two intervals:
Interval #3 time delta: 999991087ns
Interval #3 mean duration: 999907064ns, current err: -8913ns
End interval #3 duration: 999991087ns
Adjusted sample interval duration: 999991087ns
Due to the narrow window this is a very crude estimate and is only
of use to someone debugging or modifying the stats clock: remove
the value and the global variables used to track it.
Anyone with a particular use for this information can construct a
better mean by calculating the value of a greater number of
intervals.
