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(This reverts patch #d95c6154)
Filter complete device list through full_filter unconditionally when
we're getting the list of *all* devices even in case we're interested
only in fraction of those devices - the PVs, not the other devices
which are not PVs yet (e.g. pvs vs. pvs -a).
We need to do this full filtering whenever we're handling *complete*
list of devices, we need to be safe here, mainly if there are any
future changes and we'd forgot to change to use proper filtering then.
Also properly preventing duplicates if there are any block subsystem
components used (mpath, MD ...).
Thing here is that (under use_lvmetad=1), cmd->filter can be used
only if we're sure that the list of devices we're filtering contains
only PVs. We have to use cmd->full_filter otherwise (like it is in
case of _get_all_devices fn which acquires complete list of devices,
no matter if it is a PV or not).
Of course, cmd->full_filter is more extensive than cmd->filter
which is only a subset of full_filter.
We could optimize this in a way that if we're interested in PVs only
during process_each_pv processing (e.g. using pvs in contrast to pvs -a),
we'd get the list of PV devices directly from lvmetad from the
lvmcache_seed_infos_from_lvmetad fn call which currently updates
lvmcache only. We'd add an additional output arg for this fn to get
the list of PV devices directly in addition, without a need to iterate
over all devices which include non-PVs which we're not interested in
anyway, hence we could use only cmd->filter, not the cmd->full_filter.
So the code would look something like this:
static int _get_all_devices(....)
{
struct device_id_list *dil;
if (interested_in_pvs_only)
lvmcache_seed_infos_from_lvmetad(cmd, &dil); /* new "dil" arg */
/* the "dil" list would be filtered through cmd->filter inside lvmcache_seed_infos_from_lvmetad */
else {
lvmcache_seed_infos_from_lvmetad(cmd, NULL);
dev_iter_create(cmd->full_filter)
while (dev = dev_iter_get ...) {
dm_list_add(all_devices, &dil->list);
}
}
}
pvchange now uses process_each_pv so uncomment parts of the test
which check proper functionality of intersection between selection
result and PVs or PV tags directly provided on command line. This
didn't work properly before when pvchange was not using process_each_pv.
For example:
pvchange -u -S 'pv_name=/dev/sda' /dev/sdb
..changes nothing since clearly the intersection of /dev/sda and
/dev/sdb is empty set. The same applies for tags:
pvchange -u -S 'pv_name=/dev/sda' @some_tag
..changes nothing if /dev/sda is not tagged with some_tag.
It's cleaner this way - do not mix static and dynamic
(init_processing_handle) initializers. Use the dynamic one everywhere.
This makes it easier to manage the code - there are no "exceptions"
then and we don't need to take care about two ways of initializing the
same thing - just use one common initializer throughout and it's clear.
Also, add more comments, mainly in the report_for_selection fn explaining
what is being done and why with respect to the processing_handle and
selection_handle.
Invalid devices no longer included in the counters printed at the end.
May now need to use --ignoreskippedcluster if relying upon exit status.
If more than one change is requested per-PV, attempt to perform them
all. Note that different arguments still handle exit status
differently.
When lvm2 is build with valgrind pool detection - always disable
memcheck, since pool memory allocation are unconditionaly passed
into valgrind library.
We still need to get the list as the calls underneath process_each_pv
rely on this list. But still keep the change related to the filters -
if we're processing all devices, we need to use cmd->full_filter.
If we're processing only PVs, we can use cmd->filter only to save
some time which would be spent in filtering code.
When lvmetad is used and at the same time we're getting list of all
PV-capable devices, we can't use cmd->filter (which is used to filter
out lvmetad responses - so we're sure that the devices are PVs already).
To get the list of PV-capable devices, we're bypassing lvmetad (since
lvmetad only caches PVs, not all the other devices which are not PVs).
For this reason, we have to use the "full_filter" filter chain (just
like we do when we're running without lvmetad).
Example scenario:
- sdo and sdp components of MD device md0
- sdq, sdr and sds components of mpatha multipath device
- mpatha multipath device partitioned
- vda device partitioned
=> sdo,sdp,sdr,sds, mpatha and vda should be filtered!
$ lsblk -o NAME,TYPE
NAME TYPE
sdn disk
sdo disk
`-md0 raid0
sdp disk
`-md0 raid0
sdq disk
`-mpatha mpath
`-mpatha1 part
sdr disk
`-mpatha mpath
`-mpatha1 part
sds disk
`-mpatha mpath
`-mpatha1 part
vda disk
|-vda1 part
`-vda2 part
|-fedora-swap lvm
`-fedora-root lvm
Before this patch:
==================
use_lvmetad=0 (correct behaviour!)
$ pvs -a
PV VG Fmt Attr PSize PFree
/dev/fedora/root --- 0 0
/dev/fedora/swap --- 0 0
/dev/mapper/mpatha1 --- 0 0
/dev/md0 --- 0 0
/dev/sdn --- 0 0
/dev/vda1 --- 0 0
/dev/vda2 fedora lvm2 a-- 9.51g 0
use_lvmetad=1 (incorrect behaviour - sdo,sdp,sdq,sdr,sds and mpatha not filtered!)
$ pvs -a
PV VG Fmt Attr PSize PFree
/dev/fedora/root --- 0 0
/dev/fedora/swap --- 0 0
/dev/mapper/mpatha --- 0 0
/dev/mapper/mpatha1 --- 0 0
/dev/md0 --- 0 0
/dev/sdn --- 0 0
/dev/sdo --- 0 0
/dev/sdp --- 0 0
/dev/sdq --- 0 0
/dev/sdr --- 0 0
/dev/sds --- 0 0
/dev/vda --- 0 0
/dev/vda1 --- 0 0
/dev/vda2 fedora lvm2 a-- 9.51g 0
With this patch applied:
========================
use_lvmetad=1
$ pvs -a
PV VG Fmt Attr PSize PFree
/dev/fedora/root --- 0 0
/dev/fedora/swap --- 0 0
/dev/mapper/mpatha1 --- 0 0
/dev/md0 --- 0 0
/dev/sdn --- 0 0
/dev/vda1 --- 0 0
/dev/vda2 fedora lvm2 a-- 9.51g 0
List of all devices is only needed if we want to process devices
which are not PVs (e.g. pvs -a). But if this is not the case, it's
useless to get the list of all devices and then discard it without
any use, which is exactly what happened in process_each_pv where
the code was never reached and the list was unused if we were
processing just PVs, not all PV-capable devices:
int process_each_pv(...)
{
...
process_all_devices = process_all_pvs &&
(cmd->command->flags & ENABLE_ALL_DEVS) &&
arg_count(cmd, all_ARG);
...
/*
* If the caller wants to process all devices (not just PVs), then all PVs
* from all VGs are processed first, removing them from all_devices. Then
* any devs remaining in all_devices are processed.
*/
_get_all_devices(cmd, &all_devices);
...
ret = _process_pvs_in_vgs(...);
...
if (!process_all_devices)
goto out;
ret = _process_device_list(cmd, &all_devices, handle, process_single_pv);
...
}
This patch adds missing check for "process_all_devices" and it gets the
list of all (including non-PV) devices only if needed:
This makes a difference when using selection criteria based on
these fields - if those fields are defined as DM_REPORT_FIELD_TYPE_SIZE
(in contrast to DM_REPORT_FIELD_TYPE_NUMBER), units are also
recognize in selection clause.
For example:
$ lvs -o+seg_start vg1/lv2
LV VG Attr LSize Start
lv2 vg1 -wi-a----- 12.00m 0
lv2 vg1 -wi-a----- 12.00m 8.00m
Before this patch:
$ lvs -o+seg_start --select 'seg_start=8m'
Found size unit specifier but numeric value expected for selection field seg_start.
Selection syntax error at 'seg_start=8m'.
Use 'help' for selection to get more help.
With this patch applied:
$lvs -o+seg_start --select 'seg_start=8m'
LV VG Attr LSize Start
lv2 vg1 -wi-a----- 12.00m 8.00m
(the same applies for ba_start and vg_free fields)
The LVM_COMMAND_PROFILE env var is new - mention it in dumpconfig's
man page.
Also, dumpconfig always displays the top of the config cascade.
To display all the config found in the cascade merged (just like
it's used during LVM command processing), --mergedconfig option
must be used - this one's already described in that man page,
just make sure it's clear and add reference for this option also
in --profile/--commandprofile/--metadataprofile description.
This is a followup patch for previous patchset that enables selection in
process_each_* fns to fix an issue where field prefixes are not
automatically used for fields in selection criteria.
Use initial report type that matches the intention of each process_each_* functions:
- _process_pvs_in_vg - PVS
- process_each_vg - VGS
- process_each_lv and process_each_lv_in_vg - LVS
This is not normally needed for the selection handle init, BUT we would
miss the field prefix matching, e.g.
lvchange -ay -S 'name=lvol0'
The "name" above would not work if we didn't initialize reporting with
the LVS type at its start. If we pass proper init type, reporting code
can deduce the prefix automatically ("lv_name" in this case).
This report type is then changed further based on what selection criteria we
have. When doing pure selection, not report output, the final report type
is purely based on combination of this initial report type and report types
of the fields used in selection criteria.
We already allowed -S|--select with {vg,lv,pv}display -C (which
was then equal to {vg,lv,pv}s command. Since we support selection
in toolib now, we can support -S also without using -C in *display
commands now.
pvchange is an exception that does not use toollib yet for iterating
over the list of PVs (process_each_pv) so intialize the
processing_handle and use just like it's used in toollib.
We have 3 input report types:
- LVS (representing "_select_match_lv")
- VGS (representing "_select_match_vg")
- PVS (representing "_select_match_pv")
The input report type is saved in struct selection_handle's "orig_report_type"
variable.
However, users can use any combination of fields of different report types in
selection criteria - the resulting report type can thus differ. The struct
selection_handle's "report_type" variable stores this resulting report type.
The resulting report_type can end up as one of:
- LVS
- VGS
- PVS
- SEGS
- PVSEGS
This patch adds logic to report_for_selection based on (sensible) combination
of orig_report_type and report_type and calls appropriate reporting functions
or iterates over multiple items that need reporting to determine the selection
result.
The report_for_selection does the actual "reporting for selection only".
The selection status will be saved in struct selection_handle's "selected"
variable.
The code to determine final report type based on combination of input
report type (determined from fields used for reporting to output and selection)
can be reused for pure reporting for selection - factor out this code into
_get_final_report_type function.
This applies to:
- process_each_lv_in_vg - the VG is selected only if at least one of its LVs is selected
- process_each_segment_in_lv - the LV is selected only if at least one of its LV segments is selected
- process_each_pv_in_vg - the VG is selected only if at least one of its PVs is selected
- process_each_segment_in_pv - the PV is selected only if at least one of its PV segments is selected
So this patch causes the selection result to be properly propagated up to callers.
Call _init_processing_handle, _init_selection_handle and
_destroy_processing_handle in process_each_* and related functions to
set up and destroy handles used while processing items.
The init_processing_handle, init_selection_handle and
destroy_processing_handle are helper functions that allocate and
initialize the handles used when processing items in process_each_*
and related functions.
The "struct processing_handle" contains handles to drive the selection/matching
so pass it to the _select_match_* functions which are entry points to the
selection mechanism used in process_each_* and related functions.
This is revised and edited version of former Dave Teigland's patch which
provided starting point for all the select support in process_each_* fns.
The new "report_init_for_selection" is just a wrapper over
dm_report_init_with_selection that initializes reporting for selection
only. This means we're not going to do the actual reporting to output
for display and as such we intialize reporting as if no fields are reported
or sorted. The only fields "reported" are taken from the selection criteria
string and all such fields are marked as hidden automatically (FLD_HIDDEN flag).
These fields are used solely for selection criteria matching.
Also, modify existing report_object function that was used for reporting to
output for display. Now, it can either cause reporting to output or reporting
for selection only. The selection result is stored in struct selection_handle's
"selected" variable which can be handled further by any report_object caller.
This patch replaces "void *handle" with "struct processing_handle *handle"
in process_each_*, process_single_* and related functions.
The struct processing_handle consists of two handles inside now:
- the "struct selection_handle *selection_handle" used for
applying selection criteria while processing process_each_*,
process_single_* and related functions (patches using this
logic will follow)
- the "void* custom_handle" (this is actually the original handle
used before this patch - a pointer to custom data passed into
process_each_*, process_single_* and related functions).
