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If _stats_report fails (e.g. due to an invalid device on the
command line) destroy the _report to prevent stats columns headings
from being displayed.
This also requires a change in main to test the return from
_perform_command_for_all_repeatable_args inside the interval loop
and exit immediately in case of error.
The _update_interval_times() function is called once per reported
object: when shutting down at the end of a run only the first call
should free timestamps. Clear the timestamp pointers after free
and use this to signal to other callers that the clock is already
shut down.
If the Linux timerfd interface to POSIX timers is available at compile
time use it for all report interval timekeeping. This gives more
accurate interval timing when the per-interval processing time is less
than the configured interval and simplifies the timestamp bookkeeping
required to keep accurate time.
For systems without timerfd support fall back to the simple usleep based
timer.
The error path of _stats_list frees the task and stats objects:
don't try to branch to it before they have been allocated.
tools/dmsetup.c: 4589 in _stats_help() - Null pointer dereferences (FORWARD_NULL)
There's no point testing _report here in _stats_report: it's always
initialised before the function is called and if the check did fail
we'd end up freeing an uninitialized dm_task in the error path.
tools/dmsetup.c: 4389 in _stats_report() - Declaring variable "dmt" without initializer.
Add the libdm-stats module to libdm: this implements a simple interface
for creating, managing and interrogating I/O statistics regions and
areas on device-mapper devices.
The library interface is documented in libdevmapper.h and provides a
'dm_stats' handle that is used to perform statistics operations and
obtain data.
Public methods are provided to create and destroy handles and to list,
create, and destroy statistics regions as well as to obtain and parse
counter data and calculate rate-based metrics.
This commit also adds a 'dmsetup stats' (aka 'dmstats') command with
'clear', 'create', 'delete', 'list', 'print', and 'report' sub-commands.
See the library documentation and the dmstats.8 manual page for detailed
API and command descriptions.
Don't do interval management and external timekeeping for stats in
dm_report: let applications handle this on their own.
Since this has not been included in a release remove it from the
library entirely and handle report timing directly inside dmsetup.
Add a function to print column headings regardless of whether they
have already been output. This will be used by dmstats to issue
periodic reminders of the column headings.
This patch removes a check for RH_HEADINGS_PRINTED from
_report_headings that prevents headings being displayed if the flag
is already set; this check is redundant since the only existing
caller (_output_as_columns()) already tests the flag before
calling the function.
No commands set has_subcommands yet.
Move multiple device loop to separate function because we'll
soon want to call it repeatedly.
(Based on patch from bmr.)
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>
Make dm_report_init_with_selection to accept an argument with an
array of reserved values where each element contains a triple:
{dm report field type, reserved value, array of strings representing this value}
When the selection is parsed, we always check whether a string
representation of some reserved value is not hit and if it is,
we use the reserved value assigned for this string instead of
trying to parse it as a value of certain field type.
This makes it possible to define selections like:
... --select lv_major=undefined (or -1 or unknown or undef or whatever string representations are registered for this reserved value in the future)
... --select lv_read_ahead=auto
... --select vg_mda_copies=unmanaged
With this, each time the field value of certain type is hit
and when we compare it with the selection, we use the proper
value for comparison.
For now, register these reserved values that are used at the moment
(also more descriptive names are used for the values):
const uint64_t _reserved_number_undef_64 = UINT64_MAX;
const uint64_t _reserved_number_unmanaged_64 = UINT64_MAX - 1;
const uint64_t _reserved_size_auto_64 = UINT64_MAX;
{
{DM_REPORT_FIELD_TYPE_NUMBER, _reserved_number_undef_64, {"-1", "undefined", "undef", "unknown", NULL}},
{DM_REPORT_FIELD_TYPE_NUMBER, _reserved_number_unmanaged_64, {"unmanaged", NULL}},
{DM_REPORT_FIELD_TYPE_SIZE, _reserved_size_auto_64, {"auto", NULL}},
NULL
}
Same reserved value of different field types do not collide.
All arrays are null-terminated.
The list of reserved values is automatically displayed within
selection help output:
Selection operands
------------------
...
Reserved values
---------------
-1, undefined, undef, unknown - Reserved value for undefined numeric value. [number]
unmanaged - Reserved value for unmanaged number of metadata copies in VG. [number]
auto - Reserved value for size that is automatically calculated. [size]
Selection operators
-------------------
...
This makes it easier to check against the fields (following patches for
report selection) and check whether size units are allowed or not
with the field value.
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...
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.
Recent kernels allow messages to respond with a string.
Add dm_task_get_message_response() to libdevmapper to perform some
basic sanity checks and return this.
Have 'dmsetup message' display any response.
DM statistics will make extensive use of this.
(From Mikulas.)
This was a regression introduced with e33fd978a8
(libdm v1.02.68/lvm2 v2.02.89) with the introduction of new output
fields blkdevname and blkdevs_used for ls and deps dmsetup commands.
A new common '_process_options' fn was added with that commit, but the
fn was called prematurely which then broke processing of
'dmsetup splitname -o' which should implicitly use '-c' option
and this was failing after the commit:
alatyr/~ $ dmsetup splitname -o lv_name /dev/mapper/vg_data-test
Option not recognised: lv_name
Couldn't process command line.
The '-c' had to be used for correct operation:
alatyr/~ $ dmsetup splitname -c -o lv_name /dev/mapper/vg_data-test
LV
test
Now fixed to work as it did before:
alatyr/~ $ dmsetup splitname -o lv_name /dev/mapper/vg_data-test
LV
test
Compared to names, UUIDs can't be renamed once they are created
for a device. The 'mangle' command will just issue an error message
about a need for manual intervention in this case - reactivating the
device (remove + create) does the job as the defualt mangling mode
used is "auto" and that will assign a correct mangled form the UUID.
With latest changes in the udev, some deprecated functions were removed
from libudev amongst which there was the "udev_get_dev_path" function
we used to compare a device directory used in udev and directore set in
libdevmapper. The "/dev" is hardcoded in udev now (udev version >= 183).
Amongst other changes and from packager's point of view, it's also
important to note that the libudev development library ("libudev-devel")
could now be a part of the systemd development library ("systemd-devel")
because of the udev + systemd merge.
Just to make it clearer since there is the "dmsetup info -c -o blkdevname"
as well that shows the "block device name for this mapping", having a
"BlkDevName" header on output.
It's a bit confusing then if the "dmsetup info -c -o devs_used,blkdevs_used"
is named with a plural "DevNames"/"BlkDevNames" but at the same time having
a totally different meaning than the singular form "BlkDevName".
DevNames --> DevNamesUsed
BlkDevNames --> BlkDevNamesUsed
...makes it much more comprehensible.
Auto mode can't deal with multiple mangled names. We can do that while working
in hex mode, but in auto mode, this would lead to device name ambiguity.
Add 'blkdevname' and 'blkdevs_used' field to dmsetup info -c -o.
Add 'blkdevname' option to dmsetup ls --tree to see block device names.
Add '-o options' to dmsetup deps and ls to select device name type on output.
Defer the test of the function return value after the string memory is released.
Otherwise in this error path the string would present memory leak.
(Thought in this case we are already out of memory...)
With recent update of dm_report_field_string() API call to accept
completely const objects - we no longer need loose constness here
and keep it forwarding.
Make configurable default behaviour how to deal with device node creates.
With udev system natural options should be 'resume'.
For older systems where user expect there is node in /dev/mapper immediately
after dmsetup create --notable - use 'create'
FIXME:
Code needs fixing passing this flag through udev cookie.
Add new function dm_task_set_add_node() to select between 2 types
of node creation in device directory.
DM_ADD_NODE_ON_RESUME is now default and ensures node is created on
resume. Old original behavior is accessible with DM_ADD_NODE_ON_CREATE.
In this case node would be created during dmsetup create --notable.
For the user 2 new options for dmsetup create are added:
[{--addnodeonresume | --addnodeoncreate }]
Properly working node creation on resume is needed for proper operation
stacking and ability to correctly check in which state the device should
after whole udev transation.
Add test for NULL before passing uuid as src argument to memcpy.
As memcpy function is declared as function not accepting NULL.
Though we pass NULL only with zero length so this patch presents
no functional change to the code.
This rule appeared in udev v152 and it helps us to support spurious events
where we didn't have any flags set (events originated in udevadm trigger
or the watch rule). These flags are important to direct the rule application.
Now, with the help of this rule, we can regenerate old udev db content.
To implement this correctly, we need to flag all proper DM udev events with
DM_UDEV_PRIMARY_SOURCE_FLAG. That happens automatically for all ioctls
generating events originated in libdevmapper.
