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The new dm_report_object_is_selected fn makes it possible to opt whether the
object reported should be displayed on output or not. Also, in addition to
that, it makes it possible to save the result of selection (either 0 or 1).
So dm_report_object_is_selected is simply more general form of object
reporting fn - combinations now allow for:
dm_report_object_is_selected(rh, object, 1, NULL):
This is exactly the original dm_report_object fn and it's fully equal
to it.
dm_report_object_is_selected(rh, object, 0, selected):
Do not display the result on output, but save info whether the object
is selected or not in 'selected' variable.
dm_report_object_is_selected(rh, object, 1, selected):
Display the result on output (if it passes selection criteria) and save
whether the object is selected or not in 'selected' variable.
dm_report_object(rh, object, 0, NULL):
This combination is not allowed - it will end up with internal error.
We're either interested in selection status or we want to display the
result on output or both, but never nothing of the two.
Support error_if_no_space feature for thin pools.
Report more info about thinpool status:
(out_of_data (D), metadata_read_only (M), failed (F) also as health
attribute.)
Add new dm_report_compact_fields function to cause report outout
(dm_report_output) to ignore fields which don't have any value set
in any of the rows reported. This provides support for compact report
output where only fields which have something to report are displayed.
The dm_report_set_output_selection was not implemented in the end -
we have dm_report_init_with_selection instead. This is just a remnant
from development code that got into libdevmapper.h by mistake.
Support new PASSTHROUGH 'feature' flag.
Add dm_config_node to pass in policy args.
Really use origin_uuid instead of using extra call
to pass seg_areas.
Switch to 64bit feature flag bit set so there is
enough space in future for new bits...
When transaction_id is set 0 for thin-pool, libdm avoids validation
of thin-pool, unless there are real messages to be send to thin-pool.
This relaxes strict policy which always required to know
in front transaction_id for the kernel target.
It now allows to activate thin-pool with any transaction_id
(when transaction_id is passed in)
It is now upto application to validate transaction_id from life
thin-pool volume with transaction_id within it's own metadata.
Some values are reserved for special purpose like 'undefined', 'unmanaged' etc.
When using >, <, >= and < comparison operators where the range is considered,
do not include reserved values as proper values in this range which
would otherwise result in not so obvious criteria match (as the reserved value is
actually transparent for the user). It's incorrect.
Example scenario:
$ vgs -o vg_name,vg_mda_copies vg1 vg2
VG #VMdaCps
vg1 1
vg2 unmanaged
The "unmanaged" is actually mapped onto reserved value
18446744073709551615 (2^64 - 1) internally.
Such reseved value is already caught on selection criteria input
properly:
$ vgs -o name,vg_mda_copies vg1 vg2 -S 'vg_mda_copies=18446744073709551615'
Numeric value 18446744073709551615 found in selection is reserved.
However, we still need to fix situaton where the reserved value may be
included in resulting range:
Before this patch:
$ vgs -o vg_name,vg_mda_copies vg1 vg2 -S 'vg_mda_copies >= 1'
VG #VMdaCps
vg1 1
vg2 unmanaged
With this patch applied:
$ vgs -o vg_name,vg_mda_copies vg1 vg2 -S 'vg_mda_copies >= 1'
VG #VMdaCps
vg1 1
From the examples above, we can see that without this patch applied,
the vg_mda_copies >= 1 also matched the reserved value 18446744073709551615
(which is represented by the "unamanged" string on report). When
applying the operators, such values must be skipped! They're meant to
be matched only against their string representation only, e.g.:
$ vgs -o name,vg_mda_copies vg1 vg2 -S 'vg_mda_copies=unmanaged'
VG #VMdaCps
vg2 unmanaged
...or any synonyms:
$ vgs -o name,vg_mda_copies vg1 vg2 -S 'vg_mda_copies=undefined'
VG #VMdaCps
vg2 unmanaged
This is probably better approach than 3880ca5eca.
If dm module is not loaded during dm_is_dm_major call, there are no
lines for dm in /proc/devices, of course. Normally, dm_is_dm_major
is called to check existing devices, hence if module is not loaded,
we can expect there's no DM device present at the same time so we
can directly return 0 here (meaning the major number being inspected
is not dm device's one).
See also https://bugzilla.redhat.com/show_bug.cgi?id=1059711.
For dm_is_dm_major to determine whether the major number given as
an argument belongs to a DM device, libdm code needs to know what
the actual DM major is to do the comparison.
It may happen that the dm-mod module is not loaded during this
call and so for the completness let's try our best before we start
giving various errors - we can still make use of dm-mod autoloading,
though only since kernels 2.6.36 where this feature was introduced.
Add extra safety detection for thin pool transaction id
and query pool status after confirmed message.
In case there is a missmatch, immeditelly abort further
processing.
This patch adds a new flag --deferred to dmsetup remove. If this flag is
specified and the device is open, it is scheduled to be deleted on
close.
struct dm_info is extended.
The existing dm_task_get_info() is converted into a wrapper around the
new version dm_task_get_info_with_deferred_remove() so existing binaries
can still use the old smaller structure.
Recompiled code will pick up the new larger structure.
From: Mikulas Patocka <mpatocka@redhat.com>
Using "[ ]" operator together with "&&" (or ",") inside causes the
string list to be matched if and only if all the items given match
the value reported and the number of items also match. This is
strict list matching and the original behaviour we already have.
In contrast to that, the new "{ }" operator together with "&&" inside
causes the string list to be matched if and only if all the items given
match the value reported but the number of items don't need to match.
So we can provide a subset in selection criteria and if the subset
is found, it matches.
For example:
$ lvs -o name,tags
LV LV Tags
lvol0 a
lvol1 a,b
lvol2 b,c,x
lvol3 a,b,y
$ lvs -o name,tags -S 'tags=[a,b]'
LV LV Tags
lvol1 a,b
$ lvs -o name,tags -S 'tags={a,b}'
LV LV Tags
lvol1 a,b
lvol3 a,b,y
So in the example above the a,b is subset of a,b,y and therefore
it also matches.
Clearly, when using "||" (or "#") inside, the { } and [ ] is the
same:
$ lvs -o name,tags -S 'tags=[a#b]'
LV LV Tags
lvol0 a
lvol1 a,b
lvol2 b,c,x
lvol3 a,b,y
$ lvs -o name,tags -S 'tags={a#b}'
LV LV Tags
lvol0 a
lvol1 a,b
lvol2 b,c,x
lvol3 a,b,y
Also in addition to the above feature, fix list with single value
matching when using [ ]:
Before this patch:
$ lvs -o name,tags -S 'tags=[a]'
LV LV Tags
lvol0 a
lvol1 a,b
lvol3 a,b,y
With this patch applied:
$ lvs -o name,tags -S 'tags=[a]'
LV LV Tags
lvol0 a
In case neither [] or {} is used, assume {} (the behaviour is not
changed here):
$ lvs -o name,tags -S 'tags=a'
LV LV Tags
lvol0 a
lvol1 a,b
lvol3 a,b,y
So in new terms 'tags=a' is equal to 'tags={a}'.
2.02.106 added suffixes to some LV uuids in the kernel.
If any of these LVs is activated with 2.02.105 or earlier,
and then a later version is used, the LVs appear invisible and
activation commands fail.
The code now has to check the kernel for both old and new uuids.
We have "help" and "?" defined as implicit fields now. As such, we
don't need to export these names in libdevmapper (as it was introduced
by commit 7c86131233 within this release).
If anyone uses these field names by mistake, the libdevmapper code can
error out correctly if it detects that the set of explicit field names
(the ones supplied by "fields" arg in dm_report_init/dm_report_init_with_selection)
contains any of the implicit field names (the ones defined internally
by libdevmapper itself).
Making "help" and "?" implicit also simplifies code since the
dm_report_init caller (lvm/dmsetup) doesn't need to check on
dm_report_init return whether "help" or "?" was hit while parsing
fields/sort keys in libdevmapper.
The libdevmapper now sets internal "RH_ALREADY_REPORTED" flag
after it reports the "help" or "?" implicit field. Then libdevmapper
itself checks for this flag in dm_report_object and if found,
the actual reporting is skipped (because the "help" implicit field
was reported instead of the actual report).
Ordering string list items on reports is also new compared to
previous state where items were not ordered at all and they
got reported simply as they appeared/were processed.
Warn when --udevcookie/DM_UDEV_COOKIE is used with 'dmsetup remove --force'.
When command is doing multiple ioctl operations on a single device,
it may invoke udev activity, that is colliding with further ioctl commands.
The result of such operation becomes unpredictable.
Use of --retry could partially help...
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.
When the last entry in the timeout queue is unregistered,
wakeup sleeping condition, so the thread is deleted earlier.
So the thread resource is release earlier.
Also when monitored with tools like valgrind this eliminites reported
leak.
Individual events are handled through separate threads,
so once we have more then a single thread in this eventwait
sleeping, we got race on the dm_log setting, since
if one event is timeout out on alarm, while another is still waiting,
then dm log has been restored to NULL and the next sigalarm
has been reported as error.
Fix it by introducing counter which is protected via mutex,
and only when the last event is released, logging is restored.
TODO: libdm seems to have some static vars which may audit
for this type of use.
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.
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.
Send error message on stdout, since after _display_info_long()
command return errors.
Patch makes consistent behavior for command:
dmsetup info -c non-existing-dev
&
dmsetup info non-existing-dev
Now both commands report error on stderr when they return error status
for non-existing device.
On modern systems udev manages nodes in /dev/mapper directory.
It creates, deletes and renames the nodes according to the
state of the kernel driver.
When the dmsetup is compiled without udev support (--enable-udev_sync)
and runs on the system with running udevd it tries to manage nodes in
/dev/mapper too, so it can race with udev.
dmsetup checks if the node was created/deleted/renamed with the stat
syscall, and skips the operation if it was. However, if udev
creates/deletes/renames the node after the stat syscall and before the
mknod/unlink/rename syscall, dmsetup reports an error.
Since in the system everything happened as expected, skip reporting
error for such case.
These races can be easily provoked by inserting sleep at appropriate
places.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
This file may be included by other programs, so it should be compliant
with the C standard.
* use __linux__ instead of linux - __linux__ is always defined, linux is
not defined when gcc runs in standard-compliant mode (with -std=c89 or
-std=c99) because the C standard doesn't allow polluting namespace
with arbitrary defines.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Just like we have symbolic names assigned to general DM udev flags
(DM_UDEV_* flags), we have the same for any subsystem flags now
(DM_SUBSYSTEM_UDEV_FLAG*), making it easier to use.
