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Non-dm devices have ID_PART_TABLE_TYPE variable exported in
udev db from blkid scan for *both* whole devices and partitions.
We used ID_PART_ENTRY_DISK in addition to decide whether this
is the whole device or partition and then we filtered out only
whole devices where the partition table really is.
However, ID_PART_ENTRY_DISK was added in blkid 2.20 so we need
to use a different set of variables to decide on whole devices
and partitions on systems where older blkid is still used.
Now, we use ID_PART_TABLE_TYPE to detect that there's something
related to partitioning with this device and we use DEVTYPE variable
instead to decide between whole device (DEVTYPE="disk") and partition
(DEVTYPE="partition").
For dm devices it's simpler, we have ID_PART_TABLE_TYPE variable\
set in udev db for whole devices. It's not set for partitions,
hence we don't need more variable in addition to make the decision
on whole device vs. partition (dm devices do not have regular
partitions, hence DEVTYPE can't be used anyway, it's always set
to "disk" for whole disks and partitions).
Add "size" and "size_seqno" to struct device to cache device's size
and also to control its lifetime - the cached value is valid as long
as the global _dev_size_seqno is equal to the device's size_seqno,
otherwise we need to get the size again and cache the new value.
This patch also adds new dev_size_seqno_inc() fn for the appropriate
parts of the code to increment current global value of _dev_size_seqno
and hence to cause all currently cached values for device sizes to
be invalidated.
The device size is now cached because we're planning to reuse this
information for further checks and we want to avoid checking it more
than necessary to save resources.
The extent size must fits all blocks in 4294967295 sectors
(in 512b units) this is 1/2 KiB less then 2TiB.
So while previous statement 'suggested' 2TiB is still acceptable value,
make it clear it's not.
As now we support any multiples of 128KB as extent size -
values like 2047G will still 'flow-in' otherwise the largest power-of-2
supported value is 1TiB.
With 1TiB user needs 8388608 extents for 8EiB device.
(FYI such device is already unusable with todays glibc-2.22.90-27)
4GiB extent size is currently the smallest extent size which allows
a user to create 8EiB devices (with 2GiB it's less then 8EiB).
TODO: lvm2 may possibly print amount of 'lost/unused space' on a PV,
since using such ridiculously sized extent size may result in huge
space being left unaccessible.
There are two basic groups of fields for LV segment device reporting:
- related to LV segment's devices: devices and seg_pe_ranges
- related to LV segment's metadata devices: metadata_devices and seg_metadata_le_ranges
The devices and metadata_devices report devices in this format:
"device_name(extent_start)"
The seg_pe_ranges and seg_metadata_le_ranges report devices in
this format:
"device_name:extent_start-extent_end"
This patch reverts partly what commit 7f74a99502
(v 2.02.140) introduced in this area - it added [] for
hidden devices to mark them for all four fields mentioned above.
We won't be marking hidden devices in devices and metadata_devices
fields.
The seg_metadata_le_ranges field will have hidden devices marked -
it's new enough that we don't need to care about compatibility much
yet.
The seg_pe_ranges is old enough that we shouldn't be changing this
one - so we're reverting to not marking hidden devices here.
Instead, there's going to be a new field "seg_le_ranges" which
is going to replace the seg_pe_ranges and it will mark hidden devices -
this is going to be introduced in a patch later.
So in the end we'll end up with:
(LV segment's devices)
devices field with "device_name(extent_start)" format, not marking hidden devices
seg_pe_ranges field with "device_name:extent_start-extent_end" format, not marking hidden devices (deprecated, new seg_le_ranges should be used instead for standardized format)
seg_le_ranges field with "device_name:extent_start-extent_end" format, marking hidden devices
(LV segment's metadata devices)
metadata_devices field with "device_name:extent_start-extent_end" format, not marking hidden devices
seg_metadata_le_ranges field with "device_name:extent_start-extent_end" format, marking hidden devices
Also, both seg_le_ranges and seg_metadata_le_ranges will honour the
report/list_item_separator setting which can be used to configure
the delimiter used for list items.
So, to sum it up, we will recommend using the new seg_le_ranges and
seg_metadata_le_ranges fields because they display devices with
standard extent range format, they can mark hidden devices and they
honour the report/list_item_separator setting.
We'll be keeping devices,seg_pe_ranges and metadata_devices fields
for compatibility.
The associated devices,metadata_devices,seg_pe_ranges and
seg_metadata_le_ranges are reported as genuine string lists now.
This allows for using the items separately in -S|--select
(so searching for subsets etc.) and also it allows for
configuring the separator using report/list_item_separator
which may be useful in scripts (however, we'll enable this
only for seg_le_metadata_ranges and not for devices,seg_pe_ranges
and seg_metadata_devices for compatibility reasons - see following
patch).
When reporting on LVs, take the end of the range from the size of the
underlying (hidden) LV rather than the logical size of the current
segment (that PVs use).
Existing cache_settings field displays the settings which are
saved in metadata. Add new kernel_cache_settings fields to display
the settings which are currently used by kernel, including fields
for which default values are used.
This way users have complete view of the set of cache settings
supported (and which they can set) and their values which are used
at the moment by kernel.
For example:
$ lvs -o name,cache_policy,cache_settings,kernel_cache_settings vg
LV Cache Policy Cache Settings KCache Settings
cached1 mq migration_threshold=1024,write_promote_adjustment=2 migration_threshold=1024,random_threshold=4,sequential_threshold=512,discard_promote_adjustment=1,read_promote_adjustment=4,write_promote_adjustment=2
cached2 smq migration_threshold=1024 migration_threshold=1024
cached3 smq migration_threshold=2048
Fix lvm2app to return either 0 or 1 for lvm_vg_is_{clustered,exported},
including internal functions pvseg_is_allocated and vg_is_resizeable
which are not yet exposed in lvm2app but make them consistent with the
rest.
This reverts e28e22b9e1
The problem that that commit was fixing (pytest failure)
no longer appears with the current code, so the commit is
not needed.
That commit is a problem for pvchange, because it prevents
lvmcache from retaining VG metadata even while the global
lock is held. pvchange holds the global lock to ensure
that VG metadata is kept in lvmcache throughout processing.
If the cache is not kept, a PV with zero MDAs will appear
first in its actual VG and then appear again in the orphan VG.
It wrongly appears a second time in the orphan VG only if
the actual VG is dropped from lvmcache.
Thin pool discard mode set in metadata can be different from the one
actually used if any device underneath does not support that mode. Add
kernel_discard report field to make it possible to see this difference.
Internal _alloc_init() is only called from allocate_extents(),
which already does prevent usage of virtual segments.
So mark as internal error early and do not process it any further.
Add new test for lv_is_snapshot().
Also move few other bitchecks into same place as remaining bit tests.
TODO: drop lv_is_merging_origin() and keep using lv_is_merging().
Include brackets for the name if the dev is invisible.
This change applies to all callers of _format_pvsegs fn:
- lvseg_devices (the "lvs -o devices")
- lvseg_metadata_devices (the "lvs -o metadata_devices)
- lvseg_seg_pe_ranges (the "lvs -o seg_pe_ranges")
- lvseg_seg_metadata_le_ranges (the "lvs -o seg_metadata_le_ranges")
The common lv_pool_lv fn avoids code duplication and also
the reporting part now uses _lvname_disp and _uuid_disp to display
name and uuid respectively, including brackets for the name if the
dev is invisible.
The common lv_metadata_lv fn avoids code duplication and also
the reporting part now uses _lvname_disp and _uuid_disp to display
name and uuid respectively, including brackets for the name if the
dev is invisible.
The common lv_data_lv fn avoids code duplication and also
the reporting part now uses _lvname_disp and _uuid_disp to display
name and uuid respectively, including brackets for the name if the
dev is invisible.
