Zdenek Kabelac [Tue, 7 Oct 2014 13:41:54 +0000 (15:41 +0200)]
lvcreate: regression fix on lv name limits
When we are given an existing LV name - it needs to be allowed
to pass in even restricted name as the LV could have existed
long before we introduced some new restriction on prefix/suffix.i
Fix the regression on name limits and drop restriction to be applied
on any existing LVs - only the new created LV names have to be
complient with current name restrictions.
FIXME: we are currently using restricted names incorrectly in few
other places - device_is_usable() skips restricted names,
and udev flags are also incorrectly set for restricted names
so these LVs are not getting links properly.
Peter Rajnoha [Tue, 7 Oct 2014 06:58:51 +0000 (08:58 +0200)]
metadata: add internal error if PV has no existing device attached during find_pv_in_vg
find_pv_in_vg fn iterates over the list of PVs covered by the VG and
each PV's pvl->pv->dev is compared with device acquired from device
cache. However, in case pvl->pv->dev is NULL as well as device cache
returns NULL (e.g. when device is filtered), we'll get incorrect match
and the code calling find_pv_in_vg uses incorrect PV (as it thinks
it's the exact PV with the pv_name). The INTERNAL_ERROR covers this
situation and errors out immediately.
David Teigland [Tue, 7 Oct 2014 00:04:09 +0000 (01:04 +0100)]
metadata: Use flags to control warnings.
The warnings arg was used to enable logging of warnings
when reading a PV. This arg is turned into a set of flags
with the WARN_PV_READ flag matching the existing behavior.
A new flag WARN_INCONSISTENT is added that will cause
vg_read_internal() to log the "VG is not consistent"
warning so the various callers do not need to log
this warning themselves.
A new vg_read flag READ_WARN_INCONSISTENT is used from
reporting to enable the WARN_INCONSISTENT flag in
vg_read_internal.
[Committed by agk with cosmetic changes and tweaks.]
David Teigland [Mon, 6 Oct 2014 23:34:04 +0000 (00:34 +0100)]
toollib: Rewrite process_each_pv.
Process PVs by iterating through VGs, then iterating through
devices if the command needs to process non-PV devices.
The process_single function can always use the VG and PV args.
[Committed by agk with cosmetic changes and tweaks.]
David Teigland [Mon, 6 Oct 2014 18:29:18 +0000 (13:29 -0500)]
man: lvmthin show the lvcreate -n option for pools
lvcreate of thin pools can now use '-n lv vg' like other lv types,
or it can name the new thin pool in the free arg as 'vg/lv', which
is not allowed with other lv types.
Zdenek Kabelac [Mon, 6 Oct 2014 10:18:57 +0000 (12:18 +0200)]
pool: validate_pool_chunk_size
Introduce pool function for validation of chunk size.
It's good idea to be able to reject invalid chunk size
when entered on command line before we open VG.
Zdenek Kabelac [Sat, 4 Oct 2014 13:32:24 +0000 (15:32 +0200)]
lvconvert: options splitcache, split, uncache
--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.
David Teigland [Fri, 3 Oct 2014 22:37:49 +0000 (23:37 +0100)]
toollib: Rewrite process_each_lv.
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.]
David Teigland [Fri, 3 Oct 2014 19:47:19 +0000 (20:47 +0100)]
toollib: Rewrite process_each_vg.
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.]
David Teigland [Wed, 1 Oct 2014 21:06:01 +0000 (16:06 -0500)]
cache: include cache mode in vg metadata and display
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.
Peter Rajnoha [Thu, 2 Oct 2014 10:00:57 +0000 (12:00 +0200)]
filters: add cmd->full_filter - composite of cmd->filter and cmd->lvmetad_filter
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.
David Teigland [Wed, 1 Oct 2014 21:58:23 +0000 (22:58 +0100)]
tools: Add ENABLE_ALL_DEVS flag.
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.
David Teigland [Wed, 1 Oct 2014 21:58:00 +0000 (22:58 +0100)]
tools: Add ALL_VGS_IS_DEFAULT flag.
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.
Peter Rajnoha [Tue, 30 Sep 2014 14:08:05 +0000 (16:08 +0200)]
filters: refresh filters when lvmetad use is toggled
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).
Peter Rajnoha [Tue, 23 Sep 2014 10:50:09 +0000 (12:50 +0200)]
filters: use usable device filter and separate lvmetad filter chain so it's not reevaluated for any lvmetad response
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
Peter Rajnoha [Tue, 23 Sep 2014 10:49:01 +0000 (12:49 +0200)]
filters: add "usable device" 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.
Peter Rajnoha [Tue, 23 Sep 2014 10:47:11 +0000 (12:47 +0200)]
refactor: make it possible to select what to check exactly when calling device_is_usable fn
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.
cleanup: Use segtype.h definitions of segment type names wherever possible
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.