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The host that owns foreign VGs is responsible for fixing up PV_EXT_USED
flag - the same already applies to repairing any inconsistent VG.
This patch also moves the iteration over vg->pvs inside
_check_or_repair_pv_ext fn - it's cleaner this way.
pv->vg is not set yet during pvcreate processing. Use pv->fmt instead to
check for these fake PVs (all normal PVs have format defined, devices
which are not PVs don't have this set).
This fixes commit 0000db7f98.
Some of the PVs are not even orphan PVs - they're fake PVs - this can
happen if we're listing all devices with "pvs -a". Such PV must not
be marked as used.
The same check as we already do for orphan PVs, just the other way
round now: if the PV is surely part of some VG and any PV the VG
contains does not have the PV_EXT_USED flag set, repair it.
For example - /dev/sda here is in VG vg and it's incorrectly not
marked as used by PV_EXT_USED flag:
pvs --binary -o pv_ext_vsn,pv_in_use
WARNING: Volume Group vg is not consistent.
WARNING: Repairing Physical Volume /dev/sda that is in Volume Group vg but not marked as used.
PV VG Fmt Attr PSize PFree ExtVsn PInUse
/dev/sda vg lvm2 a-- 124.00m 124.00m 2 1
PV header extension versions:
0 - the original PV without any extensions
1 - bootloader area support added
2 - PV_EXT_USED flag support added
So do the associated checks related to PV_EXT_USED flag only if
PV header extension found is of version 2 and higher.
If we know that the PV is orphan, meaning there's at least one MDA on
that PV which does not reference any VG and at the same time there's
PV_EXT_USED flag set, we're certainly in an inconsistent state and we
need to fix this.
For example, such situation can happen during vgremove/vgreduce if we
removed/reduced the VG, but we haven't written PV headers yet because
vgremove stopped abruptly for whatever reason just before writing new
PV headers with updated state, including PV extension flags (and so the
PV_EXT_USED flag).
However, in case the PV has no MDAs at all, we can't double-check
whether the PV_EXT_USED is correct or not - if that PV is marked
as used, it's either:
- really used (but other disks with MDAs are missing)
- or the error state as described above is hit
User needs to overwrite the PV header directly if it's really clear
the PV having no MDAs does not belong to any VG and at the same time
it's still marked as being in use (pvcreate -ff <dev_name> will fix this).
For example - /dev/sda here has 1 MDA, orphan and is incorrectly marked
with PV_EXT_USED flag:
$ pvs --binary -o+pv_in_use
WARNING: Found inconsistent standalone Physical Volumes.
WARNING: Repairing flag incorrectly marking Physical Volume /dev/sda as used.
PV VG Fmt Attr PSize PFree InUse
/dev/sda lvm2 --- 128.00m 128.00m 0
Scenario:
$ pvcreate /dev/sda
Physical volume "/dev/sda" successfully created
We're adding the PV to a VG.
Before this patch:
$ vgcreate vg /dev/sda
Physical volume "/dev/sda" successfully created
Volume group "vg" successfully created
With this path applied:
$ vgcreate vg /dev/sda
Volume group "vg" successfully created
...and verbose log containing: "Physical volume "/dev/sda" successfully written"
Make sure we won't use a PV that is already marked as used. Normally,
VG metadata would stop us from doing that, but we can run into a
situation where such metadata is missing because PVs with MDAs
are missing and the PVs left are the ones with 0 MDAs.
(/dev/sda in this example has 0 MDAs and it belongs to a VG,
but other PVs with MDA are missing)
$ pvs -o pv_name,pv_mda_count /dev/sda
PV #PMda
/dev/sda 0
$ pvcreate /dev/sda
PV '/dev/sda' is marked as belonging to a VG but its metadata is missing.
Can't initialize PV '/dev/sda' without -ff.
$ pvchange -u /dev/sda
PV '/dev/sda' is marked as belonging to a VG but its metadata is missing.
Can't change PV '/dev/sda' without -ff.
Physical volume /dev/sda not changed
0 physical volumes changed / 1 physical volume not changed
$ pvremove /dev/sda
PV '/dev/sda' is marked as belonging to a VG but its metadata is missing.
(If you are certain you need pvremove, then confirm by using --force twice.)
$ vgcreate vg /dev/sda
Physical volume '/dev/sda' is marked as belonging to a VG but its metadata is missing.
Unable to add physical volume '/dev/sda' to volume group 'vg'.
We'll use this struct in subsequent patches for PVs which should
be rewritten, not just created. So rename struct pv_to_create to
struct pv_to_write for clarity.
Address this gcc warning:
metadata/lv.c:243: warning: initialized field overwritten
metadata/lv.c:243: warning: (near initialization for 'status.seg_status')
Present with e.g.: gcc version 4.3.2 (Debian 4.3.2-1.1)
Simplify calculation of extents rounding needed for
segment size.
Segment size has to divisible by 'extent count' needed to contain
whole stripe. LVM currently does not support stripes across segment.
In case the stripe size is bigger then extent size,
require bigger rounding.
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).
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.
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.
