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When we are stacking LV over device, which has for some reason
increased read_ahead (e.g. MD RAID), the read_ahead hint
for libdevmapper is wrong (it is zero).
If the calculated read_ahead hint is zero, patch uses read_ahead of underlying device
(if first segment is PV) when setting DM_READ_AHEAD_MINIMUM_FLAG.
Because we are using dev-cache, it also store this value to cache for future use
(if several LVs are over one PV, BLKRAGET is called only once for underlying device.)
This should fix all the reamining problems with readahead mismatch reported
for DM over MD configurations (and similar cases).
Current code, when need to ensure that volume is not
active on remote node, it need to try to exclusive
activate volume.
Patch adds simple clvmd command which queries all nodes
for lock for given resource.
The lock type is returned in reply in text.
(But code currently uses CR and EX modes only.)
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).
We can temporarily violate max_lv during mirror conversion etc.
(If the operation fails, orphan mirror images are visible to administrator
for manual remove for example. Not that this should ever happen:-)
Force limit only for lvcreate (and vg merge) command.
Patch also adds simple max_lv tests into testsuite
The vg->lv_count parameter now includes always number of visible
logical volumes.
Note that virtual snapshot volume (snapshotX) is never visible,
but it is stored in metadata with visible flag.
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.
Later patch initializes lv->vg after the LV structure is prepared,
so pass through cmd context and do not use vg->cmd here.
Also move LV id calculation (which uses lv->vg too).
Also properly free memory pool if operation fails.
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.
As a simplification to the tools and further liblvm, this patch pushes
the setting of NON_BLOCKING lock flag inside the lock_vol() call.
The policy we set is if any existing VGs are currently locked, we
set the NON_BLOCKING flag.
Should be no functional change.
The seg variable is temporary variable for list iterator,
code cannot expect that after iteration it remains NULL
(it contains non-NULL pointer here id list is empty).
Patch fixes first_seg function so it now correctly returns NULL
for empty segment list.
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.)
The backup() call store metadata from memory.
But in cluster backup() call performs
remote nodes metadata backup and it reads data from disk.
For metadata backup consistency,
patch moves all backup() calls after vg_commit.
(Moreover, some tools already do that this way.)
# pvs -a -o devices
Volume group name (null) has invalid characters
Skipping volume group (null)
...
_pvsegs_sub_single creates fake vg, we need to check
that pv is real here.
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).
The all_pvs list, used in vg_read, should make its own private
copy of pv structures, otherwise (when vg will use its own pool)
it will point to released memory pool.
The same applies for get_pvs() call.
Patch adds pv_list copy helper and adds explicit memory pool
parameter into _copy_pv.
(Please note that all these helper functions cannot guarantee that
vg related fields are valid - proper vg read & lock must be used
if it is requested.)
