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--splitcache
Splits only cached LV (also pool could be specified).
Detaches cachepool from cached LV.
--split
Should be univerzal command to split various complex targets.
At this moment it knows cache.
--uncache
Opposite command to --cache. Detaches and DELETES cachepool for
cached LV.
Note: we support thin pool cached metadata device for uncaching.
Also use may specify wither cached LV or association cachepool device
to request split of cache.
Over the time lvcreate code has accumulated various hacks.
So try to move that code in right places.
Detect all types early in _lvcreate_params() so functions like
_read_size_params() do not need to change volume types.
Also ultimately respect give volume --type, that its shortcut
(-T, H, -m, -s) and after that options which do type estimation.
(i.e. --cachepool, --thinpool)
Avoid repeative tests - if we know all types are decode at once
place we can 'optimize' number of validations.
Copy the same form as the new process_each_vg.
Replace unused struct cmd_vg and cmd_vg_read() replicator
code with struct vg and vg_read() directly.
The failed_lvnames arg is no longer used since the
cmd_vg replicator wrapper was removed.
[Committed by agk with cosmetic changes and tweaks.]
Split VG argument collection from processing.
This allows the two different loops through VGs to
be replaced by a single loop.
Replace unused struct cmd_vg and cmd_vg_read() replicator
code with struct vg and vg_read() directly.
[Committed by agk with cosmetic changes and tweaks.]
The cache mode of a new cache pool is always explicitly
included in the vg metadata. If a cache mode is not
specified on the command line, the cache mode is taken
from lvm.conf allocation/cache_pool_cachemode, which
defaults to "writethrough".
The cache mode can be displayed with lvs -o+cachemode.
filters/filter-usable.c:22: warning: "ucp.check_..." may be used uninitialized in this function
This can't actually be hit in real, but let's clean this up for the compiler
to be happy again.
There are actually three filter chains if lvmetad is used:
- cmd->lvmetad_filter used when when scanning devices for lvmetad
- cmd->filter used when processing lvmetad responses
- cmd->full_fiilter (which is just cmd->lvmetad_filter + cmd->filter chained together) used
for remaining situations
This patch adds the third one - "cmd->full_filter" - currently this is
used if device processing does not fall into any of the groups before,
for example, devices which does not have the PV label yet and we're just
creating a new one or we're processing the devices where the list of the
devices (PVs) is not returned by lvmetad initially.
Currently, the cmd->full_filter is used exactly in these functions:
- lvmcache_label_scan
- _pvcreate_check
- pvcreate_vol
- lvmdiskscan
- pvscan
- _process_each_label
If lvmetad is used, then simply cmd->full_filter == cmd->filter because
cmd->lvmetad_filter is NULL in this case.
The ENABLE_ALL_DEVS flag is added to the command structure
for commands that should process all devs (pvs and non-pvs)
when they call process_each_pv and the command includes the
--all arg. This will be used in a later process_each_pv patch.
The ALL_VGS_IS_DEFAULT flag is added to the command structure
for commands that should process all vgs when they call
process_each_vg or process_each_lv with no args.
This will be used in later patches to process_each functions.
We need to use proper filter chain when we disable lvmetad use
explicitly in the code by calling lvmetad_set_active(0) while
overriding existing configuration. We need to reinitialize filters
in this case so proper filter chain is used. The same applies
for the other way round - when we enable lvmetad use explicitly in
the code (though this is not yet used).
With this change, the filter chains used look like this now:
A) When *lvmetad is not used*:
- persistent filter -> regex filter -> sysfs filter ->
global regex filter -> type filter ->
usable device filter(FILTER_MODE_NO_LVMETAD) ->
mpath component filter -> partitioned filter ->
md component filter
B) When *lvmetad is used* (two separate filter chains):
- the lvmetad filter chain used when scanning devs for lvmetad update:
sysfs filter -> global regex filter -> type filter ->
usable device filter(FILTER_MODE_PRE_LVMETAD) ->
mpath component filter -> partitioned filter ->
md component filter
- the filter chain used for lvmetad responses:
persistent filter -> usable device filter(FILTER_MODE_POST_LVMETAD) ->
regex filter
Usable device filter is responsible for filtering out unusable DM devices.
The filter has 3 modes of operation:
- FILTER_MODE_NO_LVMETAD:
When this mode is used, we check DM device usability by looking:
- whether device is empty
- whether device is blocked
- whether device is suspended (only on devices/ignore_suspended_devices=1)
- whether device uses an error target
- whether device name/uuid is reserved
- FILTER_MODE_PRE_LVMETAD:
When this mode is used, we check DM device usability by looking:
- whether device is empty
- whether device is suspended (only on devices/ignore_suspended_devices=1)
- whether device uses an error target
- whether device name/uuid is reserved
- FILTER_MODE_POST_LVMETAD:
When this mode is used, we check DM device usability by looking:
- whether device is blocked
- whether device is suspended (only on devices/ignore_suspended_devices=1)
These modes will be used by subsequent patch to create different
instances of this filter, depending on lvmetad use.
Currently, there are 5 things that device_is_usable function checks
(for DM devices only, of course):
- is device empty?
- is device blocked? (mirror)
- is device suspended?
- is device composed of an error target?
- is device name/uuid reserved?
If answer to any of these questions is "yes", then the device is not usable.
This patch just adds possibility to choose what to check for exactly - the
device_is_usable function now accepts struct dev_usable_check_params make
this selection possible. This is going to be used by subsequent patches.
When compiled with valgrind pool support - don't waste time
with preallocation of memory - it just waste of CPU cycles to
trace access to this memory.
We also may get slightly better estimation about real memory usage
during command processing.
Split internals of extract_vgname into _extract_vgname.
This common code will be used for other similar function.
Reuse skip_dev_dir() instead of less mature coded to skip
device dir.
Instead of duplicating full vg/lv name - allocate string
only vg portion of lv name.
Previously, this was the recommended form for creating a thin pool:
lvconvert --thinpool VG/ThinDataLV --poolmetadata VG/ThinMetaLV
but this is confusing, because --thinpool does not actually take
an arg, and is more naturally used to specify an existing thin pool.
The new recommended form is:
lvconvert --type thin-pool --poolmetadata VG/ThinMetaLV VG/ThinDataLV
Previously, this was the recommended form for creating a cache pool:
lvconvert --cachepool VG/CacheDataLV --poolmetadata VG/CacheMetaLV
but this is confusing, because --cachepool does not actually take
an arg, and is more natually used to specify an existing cache pool.
The new recommended form is:
lvconvert --type cache-pool --poolmetadata VG/CacheMetaLV VG/CacheDataLV
We are not using already defined segement type names where we could.
There is a lot of other places in device-mapper and LVM2 we have those
hardcoded so we should better finally have a common interface in
libdevmapper to avoid this.
