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As part of better error handling, remove DM devices that have been
sucessfully created but failed to load a table. This can happen
when pvmove'ing in a cluster and the cluster mirror daemon is not
running on a remote node - the mapping table failing to load as a
result. In this case, any revert would work on other nodes running
cmirrord because the DM devices on those nodes did succeed in loading.
However, because no table was able to load on the non-cmirrord nodes,
there is no table present that points to what needs to be reverted.
This causes the empty DM device to remain on the system without being
present in any LVM representation.
This patch should only be considered a partial fix to the overall
problem. This is because only the device which failed to load a
table is removed. Any LVs that may have been loaded as requirements
to the DM device that failed to load may be left in place. Complete
clean-up will require tracking those devices which have been created
as dependencies and removing them along with the device that failed
to load a table.
Share DM_REPORT_FIELD_RESERVED_NAME_{HELP,HELP_ALT} between libdm and
any libdm user to handle reserved field names, in this case the virtual
field name to show help instead of failing on unrecognized field.
The libdm user also needs to check the field name so it can fire
proper code in this case (cleanup, exit etc.).
If there ever would be a second call to dm_lib_init()
and envvar would be improperly set, some last set value
would be used while it should reset to default mangling mode.
When the node enters dtree with implicit dependency, it
automatically has udev flags from parent node
and could not be changed later when the node has been
entered again via i.e lvm's preload tracking.
Resolve this by tracking whether the node has been
created by implicit dependency tracking or has been
entered explicitely. Implicit node could be later
upgraded by an explicit _add_dev() with proper udev_flags.
For implicit devices add special udev flags to avoid
any scan and udev rule processing if we resume such device.
Patch allows easier removing of orphan nodes.
We need to use "--verifyudev" for dmsetup mangle command used in
the name-mangling test since without the --verifyudev, we'd end up
with the failed rename.
Also, add direct check for the dev nodes - node with old name must
be gone and node with new name must be present. Before, we checked
just the output of the command.
One bug popped up here when renaming with udev and libdevmapper
fallback checking the udev when target mangle mode is "none"
(fixme added in the libdevmapper's node rename code).
Reuse _node_send_messages for just checking
for valid transaction_id with preload.
This allows earlier detection of incosistent thin pool.
Code does the same thing, except for sending messages.
Improve testing of transation_id to not allow other difference
then either kernel TID is equal or is lower by oned and there
are queued messages for transaction.
Mark messages as submitted if the transaction_id is already matching.
Do not try to deactivate node on failure here and leave it on
proper error path of the caller.
Deactivation of top level node has to happen,
before traversing subtree.
Swap list logic and rather append new nodes to the head
and then use normal iteration.
(in-release update)
Avoid introducing libdm structure allocated in library user.
Use direct call with all currently supported args.
When new arg is added, new function will cover it.
I am reverting the commit below - removing the new 'dm_config_get_int'
function and simply calling 'dm_config_get_uint32' while casting the
'int *' pointer parameter.
Commit being reverted:
commit 94377dfd5e
Author: Jonathan Brassow <jbrassow@redhat.com>
Date: Mon Jan 27 05:26:19 2014 -0600
Misc: New function for reading lvm config file fields
Introduce 'dm_config_get_int', which will be used by the upcoming
cachepool segment type.
This patch defines a structure for holding all of the device-mapper
cache target's status information. The associated function provides
an easy way for higher levels (LVM) to consume the information.
This patch finishes the device-mapper interface for the cache and
cachepool segment types (i.e. the cache target).
This patch adds the cache segment type - the second of two necessary
to create cache logical volumes. This segment type references the
cachepool (the small fast device) and the origin (the large slow device);
linking them to create the cache device. The cache device is the
hierarchical device-mapper device that the user ulitmately makes use
of.
The cache segment sources the information necessary to construct the
device-mapper cache target from the origin and cachepool segments to
which it links.
This patch adds the new cachepool segment type - the first of two
necessary to eventually create 'cache' logical volumes. In addition
to the new segment type, updates to makefiles, configure files, the
lv_segment struct, and some necessary libdevmapper flags.
The cachepool is the LV and corresponding segment type that will hold
all information pertinent to the cache itself - it's size, cachemode,
cache policy, core arguments (like migration_threshold), etc.
Revert activated volumes if callback fails.
This is currently used only for thin_check failure support.
When thin_check detects failure in thin metadata device, it deactivate
volumes in reversed order that have been preloaded for thin pool activation.
After this change lvm command will not leave active pool subvolumes
in dm table.
Pass dnode pointer instead of rather unknown child pointer.
The pointer is currently unused and passing child pointer
is quite undefined, while dnode has at least some usability.
Add internal error warning when string value is used
as sort value for numerical field.
Using log_warn since the function itself does not return error,
so we do not confuse log_error() checker.
