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If the pvcreate --dataalignmentoffset option is not specified the start
of a PV's aligned data area will be shifted by the associated
'alignment_offset' exposed in sysfs (unless
devices/data_alignment_offset_detection is disabled in lvm.conf).
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Documented which use-cases force the reinstatement of the nuanced
handling of pe_start. As soon as orphan PVs are eliminated much of this
will no longer be a concern ('preserve_pe_start' can be reenabled in
.pv_setup).
Added defensive 'if (pv->pe_align)' check in _text_pv_write()'s pe_start
loop.
If pv_setup was given a non-zero pe_start it would short-circuit
establishing a default pv->pe_align. pv->pe_align=0 would result
in a divide by zero in _mda_setup(). 'vgconvert -M2 $vgname' hit this.
.pv_write still properly preserves pe_start if it was supplied.
Adds pe_align_offset to 'struct physical_volume'; is initialized with
set_pe_align_offset(). After pe_start is established pe_align_offset is
added to it.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
areas.
This preserved pe_start would quickly be readjusted to follow the first
mda anyway. An example use-case that hit this code path is: running
pvcreate on an already existing PV _without_ a preceeding pvremove.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Without this fix rounding the end of the first mda to a pe_align
boundary could silently exceed the disk_size.
Final 'if (start1 + mda_size1 > disk_size)' block serves as a safety
net.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Document existing pe_start policy.
Fix issue in _text_pv_setup() where existing pe_start case could have
the pv->pe_start set to pv->pe_align even though pe_start shouldn't ever
change.
vgconvert and pvcreate have a facility to preserve the existing start
of the on-disk data extents, known as pe_start.
They indicate this by passing the existing value to the pvsetup function
which must preserve it.
This patch avoids one particular case where the value could get
changed incorrectly now that the alignment settings are configurable.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This function behaves a little bit different than vg_reduce_single, because
it allowes to remove even the latest pv. This has been done to be consistent
to lvm_vg_create, which creates an empty vg.
removed_pvs has been added to the volume_group struct. vg_reduce adds remove
pvs to this list to be able to commit the changes for the pvs in lvm_vg_comm
in liblvm2app.
Initialize removed_pvs list in format-specific volume_group constructors.
Ideally, we should have a base constructor here that initializes the general
non-format specific members of struct volume_group. But until then, there
are multiple places to initialize these members. Maybe a better patch would
be a base constructor patch for struct volume_group. That is more work
though.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Signed-off-by: Thomas Woerner <twoerner@redhat.com>
Author: Dave Wysochanski <dwysocha@redhat.com>
Currently code uses pv_dev_name() for hash when getting internal
"pvX" name.
This produce corrupted metadata if PVs are missing, pv->dev
is NULL and all these missing devices returns one name
(using "unknown device" for all missing devices as hash key).
link_lv_to_vg and unlink_lv_from_vg are the only functions
for adding/removing logical volume from volume group.
Only these function should manipulate with vg->lvs list.
The snapshot segment (snapshotX) is created twice
during the text metadata segment processing.
This can cause temporary violation of max_lv count.
Simplify the code, snapshot segment is properly initialized
in init_snapshot_seg function now and do not need to be replaced
by vg_add_snapshot call.
The vg_add_snapshot() is now usefull only for adding new
snapshot and it shares the same initialization function.
The snapshot name is always generated, name paramater can be
removed from function call.
The dataalign value must always be aligned according
to MDA area.
The currect code checks if calculated value collides with
MDA area but not if the value is so small that it is
located before MDA starts.
Unfortunatelly there can be also MDA in the end of the device.
The patch adds simple check to avoid this miscalculation.
Patch expects that first MDA always starts on <= pagesize boundary
(this is true for all allowed label sector parameters).
Add lvs origin_size field.
Fix linux configure --enable-debug to exclude -O2.
Still a few rough edges, but hopefully usable now:
lvcreate -s vg1 -L 100M --virtualoriginsize 1T
Run backup of metadata on remote nodes in the
same place like local node - when calling backup().
Introduce backup_locally() which calls only
local backup if needed.
Remote backup is now trigerred by LCK_VG_BACKUP flag
combination (special VG lock).
This lock type will call check_current_backup()
(including backup_locally() call) and updates
metadata on all nodes.
(Patch fixes non-functional remote backup,
current call during VG lock never triggers.)
Since now, all code reading volume group is responsible for releasing
the memory allocated by calling vg_release(vg).
(For simplicity of use, vg_releae can be called for vg == NULL,
the same logic like free(NULL)).
Also providing simple macro for unlocking & releasing in one step,
tools usualy uses this approach.
The global memory pool (cmd->mem) should be used only for global
physical volume operations.
This patch have to be applied with all subsequent patches to complete
memory pool per vg logic.
Using separate memory pool has quite bit memory saving impact when
using large VGs, this is mainly needed when we have to use
preallocated and locked memory (and should not overflow from that
memory space).
if rlocn not defined (there is no metadata area).
In most cases it fails in validate_name(),
unfortunately there are situatuions, when
validate_name is ok and later code fails with
checksum error.
Reproducer:
# dd if=/dev/zero of=/dev/loop0
# pvcreate --metadatasize 637k /dev/loop0
Physical volume "/dev/loop0" successfully created
# pvs /dev/loop0
/dev/loop0: Checksum error
PV VG Fmt Attr PSize PFree
/dev/loop0 lvm2 -- 1.00M 1.00M
Signed-off-by: Milan Broz <mbroz@redhat.com>
-
This patch is not fully tested and leaves some related bugs unfixed.
Intended behaviour of the code now:
pe_start in the lvm2 format PV label header is set only by pvcreate (or
vgconvert -M2) and then preserved in *all* operations thereafter.
In some specialist cases, after the PV is added to a VG, the pe_start
field in the VG metadata may hold a different value and if so, it
overrides the other one for as long as the PV is in such a VG.
Currently, the field storing the size of the data area in the PV label
header always holds 0. As it only has meaning in the context of a
volume group, it is calculated whenever the PV is added to a VG (and can
be derived from extent_size and pe_count in the VG metadata).
Reports the size of the smallest metadata area in a PV or a VG.
Useful to confirm pvcreate --metadatasize or pvmetadatasize setting in
/etc/lvm/lvm.conf file.
NOTE: Actual value in these fields will most always differ from that
given in pvcreate options due to rounding and alignment effects.
Identical argument to previous patch which removed archive_enable() calls.
We add a new parameter to backup_init() which sets the enable value based
on the cmd->default_settings.backup value. This value was used to set
cmd->current_settings.backup, used in the removed backup_enable() call.
_init_backup() calls archive_init(), which originally set 'enabled' to
a hardcoded '1' value. This seems incorrect based on my read of other
areas of the code so here we add a 'enabled' paramter to archive_init().
We pass in cmd->default_settings.archive, which is obtained from the
config tree. Later in create_toolcontext, cmd->current_settings is
set to cmd->default_settings. The archive_enable() call we remove
here was using cmd->current_settings to set the 'archive' enable
value. The final value of cmd->archive_params->enabled should thus
be equivalent to the original code.
Function _text_pv_write doesn't use memory pool but static buffer,
call dm_pool_free in error path in _raw_write_mda_header is wrong.
Move pool free only to path where is the memory pool used.
