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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).
The new dm_report_object_is_selected fn makes it possible to opt whether the
object reported should be displayed on output or not. Also, in addition to
that, it makes it possible to save the result of selection (either 0 or 1).
So dm_report_object_is_selected is simply more general form of object
reporting fn - combinations now allow for:
dm_report_object_is_selected(rh, object, 1, NULL):
This is exactly the original dm_report_object fn and it's fully equal
to it.
dm_report_object_is_selected(rh, object, 0, selected):
Do not display the result on output, but save info whether the object
is selected or not in 'selected' variable.
dm_report_object_is_selected(rh, object, 1, selected):
Display the result on output (if it passes selection criteria) and save
whether the object is selected or not in 'selected' variable.
dm_report_object(rh, object, 0, NULL):
This combination is not allowed - it will end up with internal error.
We're either interested in selection status or we want to display the
result on output or both, but never nothing of the two.
Once LVM_COMMAND_PROFILE environment variable is specified, the profile
referenced is used just like it was specified using "<lvm command> --commandprofile".
If both --commandprofile cmd line option and LVM_COMMAND_PROFILE env
var is used, the --commandprofile cmd line option gets preference.
