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Existing messaging intarface for thin-pool has a few 'weak' points:
* Message were posted with each 'resume' operation, thus not allowing
activation of thin-pool with the existing state.
* Acceleration skipped suspend step has not worked in cluster,
since clvmd resumes only nodes which are suspended (have proper lock
state).
* Resume may fail and code is not really designed to 'fail' in this
phase (generic rule here is resume DOES NOT fail unless something serious
is wrong and lvm2 tool usually doesn't handle recovery path in this case.)
* Full thin-pool suspend happened, when taken a thin-volume snapshot.
With this patch the new method relocates message passing into suspend
state.
This has a few drawbacks with current API, but overal it performs
better and gives are more posibilities to deal with errors.
Patch introduces a new logic for 'origin-only' suspend of thin-pool and
this also relates to thin-volume when taking snapshot.
When suspend_origin_only operation is invoked on a pool with
queued messages then only those messages are posted to thin-pool and
actual suspend of thin pool and data and metadata volume is skipped.
This makes taking a snapshot of thin-volume lighter operation and
avoids blocking of other unrelated active thin volumes.
Also fail now happens in 'suspend' state where the 'Fail' is more expected
and it is better handled through error paths.
Activation of thin-pool is now not sending any message and leaves upto a tool
to decided later how to finish unfinished double-commit transaction.
Problem which needs some API improvements relates to the lvm2 tree
construction. For the suspend tree we do not add target table line
into the tree, but only a device is inserted into a tree.
Current mechanism to attach messages for thin-pool requires the libdm
to know about thin-pool target, so lvm2 currently takes assumption, node
is really a thin-pool and fills in the table line for this node (which
should be ensured by the PRELOAD phase, but it's a misuse of internal API)
we would possibly need to be able to attach message to 'any' node.
Other thing to notice - current messaging interface in thin-pool
target requires to suspend thin volume origin first and then send
a create message, but this could not have any 'nice' solution on lvm2
side and IMHO we should introduce something like 'create_after_resume'
message.
Patch also changes the moment, where lvm2 transaction id is increased.
Now it happens only after successful finish of kernel transaction id
change. This change was needed to handle properly activation of pool,
which is in the middle of unfinished transaction, and also this corrects
usage of thin-pool by external apps like Docker.
Add support for sending message in suspend tree for thin-pools.
When this operation is requested whole subtree suspend is then skipped.
This is experimantal support for new lvm2 code for sending message
in suspend phase where 'thin-pool origin-only suspend' will send
messages instead of really suspending thin-pool tree.
When suspening thin volume origin-only - only thin volume is suspended,
then messages are posted and thin-pool suspend is skipped.
Recognize date and time specification within selection criteria
that is formulated in a more free-form way besides to the original
basic YYYY-MM-DD HH:MM format that libdevmapper supports.
Currently, this free-form format is recognized for lv_time field.
Users are able to use expressions from this set:
- weekday names ("Sunday" - "Saturday" or abbreviated as "Sun" - "Sat")
- labels for points in time ("noon", "midnight")
- labels for a day relative to current day ("today", "yesterday")
- points back in time with relative offset from today (N is a number)
( "N" "seconds"/"minutes"/"hours"/"days"/"weeks"/"years" "ago")
( "N" "secs"/"mins"/"hrs" ... "ago")
( "N" "s"/"m"/"h" ... "ago")
- time specification either in hh:mm:ss format or with AM/PM suffixes
- month names ("January" - "December" or abbreviated as "Jan" - "Dec")
For example:
$ date
Fri Jul 3 10:11:13 CEST 2015
$ lvmconfig --type full report/time_format
time_format="%a %Y-%m-%d %T %z %Z [%s]"
$ lvs
LV VG Time
lvol0 vg Fri 2014-08-22 21:25:41 +0200 CEST [1408735541]
lvol2 vg Sun 2015-04-26 14:52:20 +0200 CEST [1430052740]
root fedora Wed 2015-05-27 08:09:21 +0200 CEST [1432706961]
swap fedora Wed 2015-05-27 08:09:21 +0200 CEST [1432706961]
lvol1 vg Tue 2015-06-30 03:25:43 +0200 CEST [1435627543]
lvol3 vg Tue 2015-06-30 14:52:23 +0200 CEST [1435668743]
lvol6 vg Wed 2015-07-01 13:35:56 +0200 CEST [1435750556]
lvol4 vg Thu 2015-07-02 12:12:02 +0200 CEST [1435831922]
lvol5 vg Thu 2015-07-02 14:30:32 +0200 CEST [1435840232]
$ lvs -S 'time=yesterday'
LV VG Time
lvol4 vg Thu 2015-07-02 12:12:02 +0200 CEST [1435831922]
lvol5 vg Thu 2015-07-02 14:30:32 +0200 CEST [1435840232]
$ lvs -S 'time since "June 30"'
LV VG Time
lvol1 vg Tue 2015-06-30 03:25:43 +0200 CEST [1435627543]
lvol3 vg Tue 2015-06-30 14:52:23 +0200 CEST [1435668743]
lvol6 vg Wed 2015-07-01 13:35:56 +0200 CEST [1435750556]
lvol4 vg Thu 2015-07-02 12:12:02 +0200 CEST [1435831922]
lvol5 vg Thu 2015-07-02 14:30:32 +0200 CEST [1435840232]
$ lvs -S 'time since "noon June 30"'
LV VG Time
lvol3 vg Tue 2015-06-30 14:52:23 +0200 CEST [1435668743]
lvol6 vg Wed 2015-07-01 13:35:56 +0200 CEST [1435750556]
lvol4 vg Thu 2015-07-02 12:12:02 +0200 CEST [1435831922]
lvol5 vg Thu 2015-07-02 14:30:32 +0200 CEST [1435840232]
$ lvs -S 'time since "2 July 9AM"'
LV VG Time
lvol4 vg Thu 2015-07-02 12:12:02 +0200 CEST [1435831922]
lvol5 vg Thu 2015-07-02 14:30:32 +0200 CEST [1435840232]
$ lvs -S 'time since "2 July 1PM"'
LV VG Time
lvol5 vg Thu 2015-07-02 14:30:32 +0200 CEST [1435840232]
...and so on.
Wire the dm_report_reserved_handler instance call in reporting/selection
infrastructure to handle reserved value actions (currently only
DM_REPORT_RESERVED_PARSE_FUZZY_NAME and DM_REPORT_RESERVED_GET_DYNAMIC_VALUE
actions).
With fuzzy names we mean the names for which it's hard or even impossible
to enumerate all possible variations of the name - the name needs to
be evaluated. An example of fuzzy name is a name which has a base
(substring) which matches and it can contain arbitrary variations
around this base. We can cover human language better with fuzzy
names as people may use several different names (or sentences) to
denote the same thing.
With dynamic values we mean the values which are not constants
and they need to be evaluated in runtime. An example of dynamic
value is a value which depends on current system state (e.g. time,
current configuration or any other state which may change and it
needs runtime evaluation).
There's a handler that can be registered with reporting/selection
using dm_report_reserved_handler instance. This is a central point
in which the computation/evaluation happens when processing reserved
values. Currently, there are two actions declared:
DM_REPORT_RESERVED_PARSE_FUZZY_NAME
(translates fuzzy name into canonical name)
DM_REPORT_RESERVED_GET_DYNAMIC_VALUE
(gets value for canonical name)
The handler is then registered as value in struct
dm_report_reserved_value (see explaining comments besided
the struct dm_report_reserved_value in libdevmapper.h).
Also, this patch provides support for simple caching of values
used during report/selection via dm_report_value_cache_{set,get}.
This is supposed to be used mainly in the dm_report_reserved_handler
instances to save values among calls so all the handler calls work
with the same base value used in computation/evaluation and/or
possibly to save resources if the evaluation is more time-consuming.
The cache is attached to the dm_report handle and so the cache is
dropped one dm_report is dropped.
Generic numbers and time values share some operators so make sure
we have the flags correctly adjusted based on expected type if
we're using reserved values.
dm_snprintf() returns upon success the number of characters printed
(excluding the null byte used to end output to strings).
So add extra byte to preserve \0.
This fixes regression when displaying more then a single lv name.
_node_name() prepares into dm_tree internal buffer device
name and it (major:minor) for easy usage for debug messages.
To avoid any allocation a small buffer in struct dm_tree is preallocated
to store this message.
This patch adds support for time values used in reporting fields.
The raw values are always stored as number of seconds since epoch.
The support that comes with this patch is the basic one which allows
only for recognition of strictly formatted date and time in selection
criteria (the format follows a subset of formats defined by ISO 8601):
date time timezone
date:
YYYY-MM-DD (or shortly YYYYMMDD)
YYYY-MM (shortly YYYYMM), auto DD=1
YYYY, auto MM=01 and DD=01
time:
hh:mm:ss (or shortly hhmmss)
hh:mm (or shortly hhmm), auto ss=0
hh (or shortly hh), auto mm=0, auto ss=0
timezone (always with + or - sign):
+hh:mm or -hh:mm (or shortly +hhmm or -hhmm)
+hh or -hh
Or directly the time (number of seconds) since Epoch (1970-01-01 00:00:00 UTC)
when the number value is prefixed by "@":
@number_of_seconds_since_epoch
This patch also adds aliases for comparison operators
used together with time values which are more intuitive
to use:
since (as alias for >=)
after (as alias for >)
until (as alias for <=)
before (as alias for <)
For example:
$ lvmconfig --type full report/time_format
time_format="%Y-%m-%d %T %z %Z [%s]"
$ lvs -o name,time vg
LV Time
lvol0 2015-06-28 21:25:41 +0200 CEST [1435519541]
lvol1 2015-06-30 03:25:43 +0200 CEST [1435627543]
lvol2 2015-04-26 14:52:20 +0200 CEST [1430052740]
lvol3 2015-06-30 14:52:23 +0200 CEST [1435668743]
$ lvs vg -o name,time -S 'time since "2015-04-26 15:00" && time until "2015-06-30"'
LV Time
lvol0 2015-06-28 21:25:41 +0200 CEST [1435519541]
lvol1 2015-06-30 03:25:43 +0200 CEST [1435627543]
lvol3 2015-06-30 14:52:23 +0200 CEST [1435668743]
$ lvs vg -o name,time -S 'time since "2015-04-26 15:00" && time until "2015-06-30 6:00"'
LV Time
lvol0 2015-06-28 21:25:41 +0200 CEST [1435519541]
lvol1 2015-06-30 03:25:43 +0200 CEST [1435627543]
$ lvs vg -o name,time -S 'time since @1435519541'
LV Time
lvol0 2015-06-28 21:25:41 +0200 CEST [1435519541]
lvol1 2015-06-30 03:25:43 +0200 CEST [1435627543]
lvol3 2015-06-30 14:52:23 +0200 CEST [1435668743]
This is basic time recognition support that is directly a part of
libdevmapper. Recognition of more free-form expressions will be a
part of subsequent patches.
Just like we have DEFAULT_USE_LVMETAD (or DEFUALT_USE_LVMPOLLD), use
fallback_to_lvm1=1 lvm.conf setting if we configured lvm2 with
--enable-lvm1-fallback and use fallback_to_lvm1=0 otherwise.
Also, generate proper lvm.conf.in with unconfigured value.
This patch allows for registration and recognition of reserved
values which are ranges, so they're composed of two values actually
to denote the lower and upper bound for the range (stored as an array
with exactly two items to define the boundaries).
Also, this patch allows for flagging reserved values as named-only
which means that such values are not strictly reserved. The strictly
reserved values are reserved values as used before this patch.
Distinction between strictly-reserved and named-only values
is clearly visible with comparisons. Normally, strictly reserved
value is not accounted for if we do "greater than" or "lower than"
comparisons, for example:
1 2 3 ....
|
abc
- we have "abc" as reserved value for field with value "2"
- the value reported for the field is "abc" (or "2", it doesn't matter here)
- the selection we're processing is -S 'field < abc'
- the result of the selection gives nothing as "abc" is strictly
reserved value (bound to "2") and there's no order defined for
it and it would only match if we directly compared the value
(so -S 'field = abc' would match)
With named-only values, the "abc" is named-only value for "2",
so selection -S 'field < abc" is the same as using -S 'field < 2'.
The "abc" is just an alias for some value so the value or its
assigned name can be used equally in selection criteria.
Make it possible to define format for time that is displayed.
The way the format is defined is equal to the way that is used
for strftime function, although not all formatting options as
used in strftime are available for LVM2 - the set is restricted
(e.g. we do not allow newline to be printed). The lvm.conf
comments contain the whole list that LVM2 accepts for time format
together with brief description (copied from strftime man page).
For example:
(defaults used - the format is the same as used before this patch)
$ lvs -o+time vg/lvol0 vg/lvol1
LV VG Attr LSize Time
lvol0 vg -wi-a----- 4.00m 2015-06-25 16:18:34 +0200
lvol1 vg -wi-a----- 4.00m 2015-06-29 09:17:11 +0200
(using 'time_format = "@%s"' in lvm.conf - number of seconds
since the Epoch)
$ lvs -o+time vg/lvol0 vg/lvol1
LV VG Attr LSize Time
lvol0 vg -wi-a----- 4.00m @1435241914
lvol1 vg -wi-a----- 4.00m @1435562231
Commit e587b0677b broke the build on
systems where /bin/sh is Dash, for example.
Origin patch by Ferenc Wágner <wferi@niif.hu> changed later to
avoid using shell call, so makefile add 'server' target when
one of metad or polld daemon is requested.
Do not display settings with undefined default values, but do display
these settings in case the value is defined directly in any part of
the existing config cascade.
For example, the lvmconfig --type current always displays these settings
(as it's somewhere in "current" configuration cascade that makes it defined).
The lvmconfig --type full displays these settings only if it's defined
somewhere in the cascade, but not if default value is used instead
The lvmconfig --type default never displays these settings...
More concrete example - let's have activation/volume_list directly
set in lvm.conf and activation/read_only_volume_list not set.
Both of these settings have *undefined default* values.
$lvmconfig --type full activation/volume_list activation/read_only_volume_list
volume_list="/dev/vg/lv"
(...only volume_list is defined, hence it's printed)
However, the comments will display more info (see also previous commit):
$lvmconfig --type full activation/volume_list activation/read_only_volume_list --withsummary
# Configuration option activation/volume_list.
# Only LVs selected by this list are activated.
# This configuration option does not have a default value defined.
# Value defined in existing configuration has been used for this setting.
volume_list="/dev/vg/lv"
# Configuration option activation/read_only_volume_list.
# LVs in this list are activated in read-only mode.
# This configuration option does not have a default value defined.
Display comment abour value from existing config being used. For example:
$ lvmconfig --type full --withsummary report/compact_output report/buffered
# Configuration option report/compact_output.
# Do not print empty report fields.
# Value defined in existing configuration has been used for this setting.
compact_output=1
# Configuration option report/buffered.
# Buffer report output.
buffered=1
The lvmconfig --type full is actually a combination of --type current
and --type missing together with --mergedconfig options used.
The overall outcome is a configuration tree with settings as LVM sees
it when it looks for the values - that means, if the setting is defined
in some config source (lvm.conf, --config, lvmlocal.conf or any profile
that is used), the setting is used. Otherwise, if the setting is not
defined in any part of the config cascade, the defaults are used.
The --type full displays exactly this final tree with all the values
defined, either coming from configuration tree or from defaults.
Synchronize with udev logic before reusing device as snapshot.
This patch tries to fix the problem with udev, where we manage
to 'active' LV for clearing, then we deactivate such device and
active again as member of 'origin&snapshot' tree all in 1 step.
There needs to be a sync point where udev has time to remove all links,
otherwise we race with scans and we may end-up with mysterious 'free'
links in the system pointing to wrong dm names.
This patch tries to fix failing topology cluster tests..
