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Commit Graph

1161 Commits

Author SHA1 Message Date
Zdenek Kabelac
bb20fac4ab libdm: maintain binary interface for new FEATURE flag
Older library version was not detecting unknown 'feature' bits
and could let start target without needed option.

New versioned symbol now checks for supported feature bits.
_Base version keeps accepting only previously known features and
mask/ignores unknown bits.

NB: if the older binary passed in 'random' bits, it will not get
metadata2 by chance. New linked binary get new validation function.
Library user is required to not pass 'trash' for unsupported bits,
as such calls will be rejected.
2017-03-10 19:33:01 +01:00
Zdenek Kabelac
ddd5a76801 libdm: support cache metadata2 feature flag
Dm cache target version 1.10 introduces new cache metadata format
(upstream kernel >=4.11).

New format is enable by passing new target feature flag metadata2.
Interace side on libdm uses DM_CACHE_FEATURE_METADATA2.
This feature bit is now also recognized on status
and set in 'feature_flags' field of dm_status_cache structure.

Code also adds check for 'highest' supported feature flag bit.
So it rejects properly any 'unknown' feature bit set by application.
2017-03-10 19:33:01 +01:00
Zdenek Kabelac
bf79fb1a33 libdm: better code to enforce writethrough
Better code to enforce writethrough caching for cleaner policy.
Only check for cleaner when DM_CACHE_FEATURE_PASSTHROUGH or
DM_CACHE_FEATURE_WRITEBACK is set.
2017-03-10 19:33:01 +01:00
Zdenek Kabelac
edf5e43f9a libdm: passthrough checks traling space char
When checking for passthrough length, check also for extra ' ' char
just like with other feature strings.
2017-03-10 19:33:01 +01:00
Zdenek Kabelac
2a9eda1229 mem: add extra mem pages for pthread stack
Some archs can use even 64K pages and then lvm2 runs into trouble if
the stack is 'too small' to fit extra page capturing stack overwrite.

So when lvm2 limits stack - add extra mem page - be it 4K or 64K.

Relates to ppc64le bug: https://bugzilla.redhat.com/1387279
2017-02-11 18:23:15 +01:00
Zdenek Kabelac
c908a8b131 libdm: avoid resume if preloaded device is smaller
When we preload device with smaller size, we avoid its resume,
so later suspend/resume of full device tree my process all
existing in flight bios.

Also update comment and avoid using confusing opposite meaning.
2017-02-10 20:29:11 +01:00
Ondrej Kozina
035c614c19 dmsetup: do not suppress kernel key descriptions in tables
Kernel 4.10 (dm-crypt v1.15.0) and later supports loading device
tables with crypt segment having key in kernel keyring retention
service.

dmsetup hid key section of tables output. With this patch dmsetup
no longer hides key section if it detects kernel key description
instead of hex byte representation of key itself.
2017-02-10 19:18:49 +01:00
Zdenek Kabelac
85dab3963f dmeventd_thin: enable support for external command
With this commit we start to support configurable action
from thin-pool monitoring via  'dmeventd/thin_command'
2017-01-21 00:01:05 +01:00
Zdenek Kabelac
f8234d6e5f libdm: add human R|readable units
When showing sizes with 'H|human' units we do use standard rounding.
This however is confusing users from time to time,
when the printed number uses some biger units i.e. GiB and there is just
tiny fraction of space missing.

So here is some real-life example with new 'r' unit.

$lvs

  LV    VG Attr       LSize  Pool Origin
  lvol0 vg -wi-a-----  1.99g
  lvol1 vg -wi-a----- <2.00g
  lvol2 vg -wi-a----- <2.01g

Meaning is - lvol1 has 'slightly' less then 2.00g - from sign '<' user
can be aware the LV doesn't have full 2.00GiB in size so he
will be less surpriced allocation of 2G volume will not succeed.

$ vgs
  VG #PV #LV #SN Attr   VSize  VFree
  vg   2   2   0 wz--n- <6,00g <2,01g

For uses needing  'old'  undecorated human unit simply will continue
to use 'H|h' units.

The new R|r  may further change when we would recongnize some
other way how to improve readability.
2017-01-20 23:52:17 +01:00
Zdenek Kabelac
dd19b56985 thin: refresh status when error processing fails
When thin-pool processes event and 'lvextend --use-policies' fails
rather capture up-to-date new info as the fullness percentage may
have jumped noticable. This way we could use 'more' correct numbers
when checking for thresholds.
2016-12-22 23:37:07 +01:00
Bryn M. Reeves
c90e9392e4 libdm: add dm_stats_bind_from_fd()
dmsetup already has a version of this function, and dmfilemapd will
need it too: move it to libdevmapper to avoid copying it around.
2016-12-18 20:47:17 +00:00
Zdenek Kabelac
954c59779d libdm: drop callback on revert path
The system is likely in some very inconsisten state.
Do not try to make it even more problematic with trying
to invoke tools like thin_check via callback.
2016-12-18 19:29:08 +01:00
Bryn M. Reeves
93f420caf4 libdm: fix _stats_get_extents_for_file()
Handle files that contain multiple logical extents in a single
physical extent properly:

  - In FIEMAP terms a logical extent is a contiguous range of
    sectors in the file's address space.

  - One or more physically adjacent logical extents comprise a
    physical extent: these are the disk areas that will be mapped
    to regions.

  - An extent boundary occurs when the start sector of extent
    n+1 is not equal to (n.start + n.length).

This requires that we accumulate the length values of extents
returned by FIEMAP until a discontinuity is found (since each
struct fiemap_extent returned by FIEMAP only represents a single
logical extent, which may be contiguous with other logical
extents on-disk).

This avoids creating large numbers of regions for physically
adjacent (logical) extents and fixes the earlier behaviour which
would only map the first logical extent of the physical extent,
leaving gaps in the region table for these files.
2016-12-13 09:09:25 +00:00
Zdenek Kabelac
6f84d3c69c libdm: validate vsnprintf
Avoid using buffer when no output has been generated.
Missed in ee13f265f0.
2016-12-11 23:24:17 +01:00
Bryn M. Reeves
d8ba8ee9ae libdm: use a private pool for filemap extent table
When mapping regions to a file descriptor, a temporary table of
extent descriptors is built using the dm_pool object building
interface.

Previously this use borrowed the dms->mem region and counter
table pool (since nothing can interleave with the allocation
while the caller is still in dm_stats_create_regions_from_fd()).

This turns out to be problematic for error recovery. When a
region creation operation fails partway through file mapping,
we need to roll back the set of already created regions and
this requires a listed handle: the dm_stats_list() will then
allocate from the same pool as the extents; we either have
to throw away valid list data, or leak the extent table, to
return the handle in a valid state.

Avoid this problem by creating a new, temporary mem pool in
_stats_create_file_regions() to hold the extent data, and
discarding it on exit from the function.
2016-12-10 13:31:12 +00:00
Bryn M. Reeves
1de3e106c9 doc: add filemap creation fixes to WHATS_NEW_DM 2016-12-10 12:02:30 +00:00
Alasdair G Kergon
bb5eb324e3 post-release 2016-11-30 23:21:11 +00:00
Alasdair G Kergon
57e24817b7 pre-release 2016-11-30 23:14:34 +00:00
Zdenek Kabelac
74923c213f cleanup: add doc for raid status states
Show possible values for raid fields user may get ATM.
2016-11-23 17:55:03 +01:00
Alasdair G Kergon
9e03fc3c2a post-release 2016-11-05 01:14:06 +00:00
Alasdair G Kergon
eed708dbd9 pre-release 2016-11-05 01:03:32 +00:00
Zdenek Kabelac
e3775173b4 cleanup: log_info to log_error
Switch to more appropriate logging level.
2016-11-03 17:49:07 +01:00
Zdenek Kabelac
ee13f265f0 libdm: use dm_log_with_errno always
Instead of compiling 2 log call for 2 different logging functions,
and runtime decide which version to use - use only 'newer' function
and when user sets his own OLD dm_log logging translate it runtime
for old arg list set.

The positive part is - we get shorter generated library,
on the negative part this translation means, we always have evaluate
all args and print the message into local on stack buffer, before
we can pass this buffer to the users' logging function with proper
expected parameters (and such function may later decide to discard
logging based on message level so whole printing was unnecessary).
2016-11-03 17:49:07 +01:00
Zdenek Kabelac
4b4d19e3aa dmeventd: separate dm and dmeventd logging
Ensure different logging function for dmeventd.c logging
and dm and lvm library.

We can recognize we want to show every log_info() and
log_notice() message from dmeventd.c code while not
exposing those from libdm/libdevmapper-event

Also switch to use log with errno - it's not changing
anything and doesn't bring any more features yet to dmeventd
logging but we just properly pass dm_errno_or_class properly
through the whole code stack for possible future use
(i.e. support of class logging for dmeventd).
2016-11-03 12:43:09 +01:00
Zdenek Kabelac
cd468b6218 dmeventd: debug only subsystemd with # sign
Reword the logging logic and try to restore previous logging
behavior for 'standalone' running daemon while preserving
debuggable feautures it has gained.

So actual rules:

dmeventd without any '-d' option will syslog all messages
from dmeventd.c it dmeventd plugins.

log_notice()==log_verbose()
log_info()==log_very_verbose()
But to show also log_debug() used has to give '-ddd'.

When user specified '-d, -dd, -ddd, -dddd' it
will also enable tracing of messages from libdm & lib
executed code - which is mainly useful for testing
i.e.: 'dmeventd -fldddd'
2016-11-03 12:43:09 +01:00
Zdenek Kabelac
33dd1f7747 dmeventd: abort on internal error
Provide same support for DM_ABORT_ON_INTERNAL_ERRORS we do have
with default libdm logging  as  dmeventd is libdm based tool.
2016-11-03 12:43:09 +01:00
Zdenek Kabelac
e50d434a35 libdm: report logging with errno as changed default
When user changes logging with 'dm_log_with_errno_init()'
also report this as non default dm logging.
2016-11-03 12:43:09 +01:00
Zdenek Kabelac
6af26273cb logging: add more log macros
Introduce macros:

log_level(), log_stderr(), log_once(), log_bypass_report()

For easier and more consisten way how to 'decoder' bits
of info from passed 'level'.

This patch fixes potential problem when 'level' of message
might not have always masked right bits.
2016-11-03 12:43:09 +01:00
Alasdair G Kergon
34da83d729 dmsetup: Produce partial output if dev disappears.
If a device disappears after obtaining the list of devices but before
processing it as a member of that list, dmsetup exits with a failure code.

Most commands still produce what output they can in these circumstances,
but 'ls --tree' and 'info -c' with fields depending on device dependencies
didn't.  Change this.
2016-10-18 18:01:52 +01:00
Zdenek Kabelac
00f883a4aa dmeventd: pthread_sigmask in single function
Integrate back _unblock_sigalrm() and check for error code of
pthread_sigmask() function so we do not use uninitialized
sigmask_t on error path (Coverity).
2016-10-03 17:47:28 +02:00
Zdenek Kabelac
d70f112762 libdm: check for mem when _canonicalize_field_ids
Add missing check for dm_pool_strdup() call (Coverity).
2016-10-03 17:46:26 +02:00
Zdenek Kabelac
ee04f1fcfd raid: dmeventd plugin use 64bit arithmetic
Coverity suggested to used 64bit unsigned ints instead of signed 32b int.
Assuming there is no user of >31legs raid array.
2016-10-03 17:44:25 +02:00
Bryn M. Reeves
56c90ffa5e libdm: fix dm_stats_delete_region() backwards compat
The dm_stats_delete_region() call removes a region from the bound
device, and, if the region is grouped, from the group leader
group descriptor stored in aux_data.

To do this requires a listed handle: previous versions of the
library do not since no dependencies exist between regions without
grouping.

This leads to strange behaviour when a command built against an old
version of the library is used with one supporting groups. Deleting
a region with dmstats succeeds, but logs errors:

  # dmstats list
  Name             RgID RgSta RgSiz #Areas ArSize ProgID
  vg_hex-root         0     0 1.00g      1  1.00g dmstats
  vg_hex-root         1 1.00g 1.00g      1  1.00g dmstats
  vg_hex-root         2 2.00g 1.00g      1  1.00g dmstats
  # dmstats delete --regionid 2 vg_hex/root
  Region ID 2 does not exist
  Could not delete statistics region.
  Command failed
  # dmstats list
  Name             RgID RgSta RgSiz #Areas ArSize ProgID
  vg_hex-root         0     0 1.00g      1  1.00g dmstats
  vg_hex-root         1 1.00g 1.00g      1  1.00g dmstats

This happens because the call to dm_stats_delete_region() is inside
a dm_stats_walk_*() iterator: upon entry to the call, the iterator
is at its end conditions and about to terminate. Due to the call to
dm_stats_list() inside the function, it returns with an iterator at
the beginning of a walk and performs a further iteration before
exiting. This final loop makes a further attempt to delete the
(already deleted) region, leading to the confusing error messages.
2016-09-27 17:58:05 +01:00
Bryn M. Reeves
6ec8854fdb libdm: fix stats walk compatibility with older dmsetup
The current dmsetup.c handles DR_STATS and DR_STATS_META reports
separately in _display_info_cols(), meaning that the stats walk
functions are never called for these report types.

Versions before v2.02.159 have a loop using dm_stats_walk_do() and
dm_stats_walk_while(), that executes once for non-stats reports,
and once per region, or area, for DR_STATS/DR_STATS_META reports.

This older behaviour relies on the documented behaviour that the
walk functions will accept a NULL pointer as the struct dm_stats*
argument.

This was broken by commit f1f2df7b: the NULL test on dms and
dms->regions were incorrectly moved from the dm_stats_walk_end()
wrapper to the internal '_stats_walk_end()' helper.

Since the pointer is dereferenced in between these points, using
an older dmsetup with current libdm results in a segfault when
running a non-stats report:

  # dmsetup info -c vg00/lvol0
  Segmentation fault (core dumped)

Restore the NULL checks to the wrapper function as intended.
2016-09-27 14:46:00 +01:00
Alasdair G Kergon
397c246fe0 post-release 2016-09-26 14:29:35 +01:00
Alasdair G Kergon
5233a3468c pre-release 2016-09-26 14:20:08 +01:00
Zdenek Kabelac
f93cddeafd man: fix dmsetup stats
Fix typo  STATS -> STATUS.
2016-09-26 12:38:32 +02:00
Peter Rajnoha
7563e69cf1 libdm: add dm_config_parse_without_dup_node_check
Introduce function for config parsing tree without checking
for duplicate nodes.
2016-09-21 18:15:18 +02:00
Alasdair G Kergon
01cc0dfae9 post-release 2016-09-07 02:34:15 +01:00
Alasdair G Kergon
3d2b1ff5c4 pre-release 2016-09-07 02:25:51 +01:00
Alasdair G Kergon
c7bd33d951 post-release 2016-08-15 13:23:06 +01:00
Alasdair G Kergon
8297276967 pre-release 2016-08-15 13:17:47 +01:00
Alasdair G Kergon
480c1c9599 post-release 2016-08-10 03:01:55 +01:00
Alasdair G Kergon
37b8b84fee pre-release 2016-08-10 02:42:35 +01:00
Alasdair G Kergon
6b6e258e0c post-release 2016-07-28 19:58:22 +01:00
Alasdair G Kergon
6f47e79a88 pre-release 2016-07-28 18:36:45 +01:00
Peter Rajnoha
f9697ea006 libdm: report: fix json reporting to escape '"' character that may appear in reported string 2016-07-26 12:27:41 +02:00
Alasdair G Kergon
9c6a26f50a post-release 2016-07-15 22:02:58 +01:00
Alasdair G Kergon
3d717b52c1 pre-release 2016-07-15 21:55:38 +01:00
Peter Rajnoha
42e76a1920 blkdeactivate: add -m|--mpathoption disablequeueing and use it for blk-availability systemd service and initscript
blkdeactivate -m disablequeueing causes "multipathd disablequeueing maps"
call inside blkdeactivate script before deactivating devices. This
avoids a situation where blkdeactivate may wait for paths to appear if
multipath is set to queueing and there's a stack of other devices and/or
mount points on top of such multipath device.

See also https://bugzilla.redhat.com/show_bug.cgi?id=1344381.
2016-07-12 10:01:07 +02:00
Bryn M. Reeves
008c57714a WHATS_NEW_DM: add --segments grouping and resource leak fix 2016-07-08 17:27:52 +01:00
Bryn M. Reeves
db63587ce2 WHATS_NEW_DM: add --filemap and histogram aggregation 2016-07-08 17:27:52 +01:00
Alasdair G Kergon
f6b98ec7ca post-release 2016-07-06 17:04:25 +01:00
Alasdair G Kergon
8ca874bc1f pre-release 2016-07-06 16:55:44 +01:00
Alasdair G Kergon
fb0a671419 post-release 2016-07-06 01:14:33 +01:00
Alasdair G Kergon
6022715c81 pre-release 2016-07-06 00:59:28 +01:00
Bryn M. Reeves
f403ac8bf0 doc: update dmstats.8.in for groups 2016-07-05 19:53:16 +01:00
Bryn M. Reeves
cda1622fef libdm: allow deleting regions with dm_stats_delete_group()
Add a flag to dm_stats_delete_group() to allow optional deletion
of all regions belonging to the group being removed.
2016-07-05 19:53:16 +01:00
Bryn M. Reeves
f1f2df7bc0 libdm: add stats group and region iterators and properties
Add support do dm_stats_walk*() to walk over the set of
available groups using the cursor embedded in the dm_stats
handle, and to obtain the type of the object at the current
stats cursor location. A set of flags is introduced to
control which objects are visited:

    DM_STATS_WALK_AREA
    DM_STATS_WALK_REGION
    DM_STATS_WALK_GROUP
    DM_STATS_WALK_ALL

A final flag suppresses visits to regions that contain only a
single area - since the aggregate of such a region is idential
to the area it contains this allows these duplicates to be
filtered out:

    DM_STATS_WALK_SKIP_SINGLE_AREA

If flags are not initialised before beginning a walk the default
set matches the behaviour of previous versions of the library.

Also accept group identifiers as immediate arguments to the
counter, metric, and property functions by adding control
flags to the region and area identifiers passed in.

Region and area properties are mapped to their equivalents for
the group (for example: group size is reported as the sum of
all regions contained in the group). Counter and metric values
are aggregated for the region or group.
2016-07-05 19:53:16 +01:00
Bryn M. Reeves
2cb9794da2 libdm: add statistics groups
Add a grouping facility to the libdm-stats library that allows the
user to bind several regions together as a group. Groups may be
used to aggregate data from several regions for reporting, or to
select and sort among large sets of regions.

A textual descriptor ("group tag") is associated with each group
and is stored in the first group member's aux_data field. The
tag contains the group member list and an optional alias for the
group, allowing the user to assign meaningful names to groups of
regions.

These descriptors are parsed in @stats_list message responses and
populate the resulting region and area tables with the group
structure.

Groups with overlapping regions are permitted but since this will
result in some events being counted more than once a warning is
printed in this case.

Nested and overlapping groups are not currently supported and
attempting to create these configurations results in error.
2016-07-05 19:53:16 +01:00
Bryn M. Reeves
82e5766062 libdm: add enum based counter and metric calls
Add a new enum based interface for accessing counter and metric
values that uses a single function for each:

uint64_t dm_stats_get_counter(const struct dm_stats *dms,
                              dm_stats_counter_t counter
                              uint64_t region_id, uint64_t area_id);

int dm_stats_get_metric(const struct dm_stats *dms, int metric,
                        uint64_t region_id, uint64_t area_id,
                        double *value);

This simplifies the implementation of value aggregation for
groups of regions. The named function interface now calls the
enum interface internally so that all new functionality is
available regardless of the method used to retrieve values.
2016-07-05 19:53:16 +01:00
Bryn M. Reeves
81fad9e853 libdm: add dm_bitset_parse_list()
Add a function to parse a list of integer values and ranges into
a dm_bitset representation. Individual values signify that that bit
is set in the resulting mask and ranges are given as a pair of
start and end values, M-N, such that M and N are the first and
last members of the range (inclusive).

The implementation is based on the kernel's __bitmap_parselist()
that is used for cpumasks and other set configuration passed in
string form from user space.
2016-07-05 19:53:16 +01:00
Zdenek Kabelac
2f638e07e8 dmeventd: thin plugin umount over 95%
Run umount code only when either thin data or metadata are
above 95% - so if there are resize failures with 60%.
system fill keep running.

Also umount will only be tried with lvm2 LVs.
Foreign users are ATM unsuppored.
2016-07-01 00:43:45 +02:00
Alasdair G Kergon
a46f524247 post-release 2016-06-25 20:47:49 +01:00
Alasdair G Kergon
887f071b25 pre-release 2016-06-25 20:35:14 +01:00
Peter Rajnoha
5b93db6566 libdm: select: recognize special selection string 'all' as an alias for blank selection string 2016-06-20 11:33:43 +02:00
Peter Rajnoha
2078b842fb libdm: report: add dm_report_set_selection
Since we can do repeated dm_report_output calls now, we also like
to be able to set selection for each of these outputs.
2016-06-20 11:33:43 +02:00
Peter Rajnoha
f2facdc1d0 libdm: report: add DM_REPORT_OUTPUT_MULTIPLE_TIMES report flag to keep report data even after output is done
The DM_REPORT_OUTPUT_MULTIPLE_TIMES instructs reporting code to
keep rows even after dm_report_output call - the rows are not
destroyed in this case which makes it possible to call dm_report_output
multiple times.
2016-06-20 11:33:43 +02:00
Peter Rajnoha
0ba5f4b8e9 refactor: move field width calculation and sort preparation from _do_report_object to dm_report_output
This also prepares code for repeated dm_report_output calls.
2016-06-20 11:33:42 +02:00
Peter Rajnoha
f50d4011cd log: also pass log_print through report and add log_print_bypass_report for use in libdm-report for direct print without report
log_print is used during cmd line processing to log the result of the
operation (e.g. "Volume group vg successfully changed" and similar).

We don't want output from log_print to be interleaved with current
reports from group where log is reported as well. Also, the information
printed by log_print belongs to the log report too, so it should be
rerouted to log report if it's set.

Since the code in libdm-report which is responsible for doing the report
output uses log_print too, we need to use a different kind of log_print
which bypasses any log report currently used for logging (...simply,
we can't call log_print to output the log report itself which in turn
would again reroute to report - the report would never get on output
this way).
2016-06-20 11:33:42 +02:00
Peter Rajnoha
094fce3776 libdm: report: implement DM_REPORT_GROUP_JSON for JSON report output
This patch introduces DM_REPORT_GROUP_JSON report group type. When using
this group type and when pushing a report to such a group, these flags
are automatically unset:

   DM_REPORT_OUTPUT_ALIGNED
   DM_REPORT_OUTPUT_HEADINGS
   DM_REPORT_OUTPUT_COLUMNS_AS_ROWS

...and this flag is set:

   DM_REPORT_OUTPUT_BUFFERED

The whole group is encapsulated in { } for the outermost JSON object
and then each report is reported on output as array of objects where
each object is the row from report:

  {
     "report_name1": [
         {field1="value", field2="value",...},
         {field1="value", field2="value",...}
         ...
     ],
     "report_name2": [
         {field1="value", field2="value",...},
         {field1="value", field2="value",...}
         ...
     ]
     ...
  }
2016-06-20 10:42:26 +02:00
Peter Rajnoha
230b7ff0f6 libdm: report: implement DM_REPORT_GROUP_BASIC for extended report output
This patch introduces DM_REPORT_GROUP_BASIC report group type. This
type has exactly the classical output format as we know from before
introduction of report groups. However, in addition to that, it allows
to put several reports into a group - this is the very basic grouping
scheme that doesn't change the output format itself:

  Report: report1_name
  Header1  Header2 ...
  value    value   ...
  value    value   ...
  ...      ...     ...

  Report: report2_name
  Header1  Header2 ...
  value    value   ...
  value    value   ...
  ...      ...     ...
2016-06-20 10:42:26 +02:00
Peter Rajnoha
a9fe57db1c libdm: report: implement DM_REPORT_GROUP_SINGLE for a group containing single report only
There's no change in output for this report group type - with this type,
we only make sure there's always only one report in a group at a time,
not more.
2016-06-20 10:42:18 +02:00
Peter Rajnoha
9c8f912ea7 libdm: report: introduce dm_report_group
This patch introduces DM report group (represented by dm_report_group
structure) that is used to group several reports to make a whole. As a
whole, all the reports in the group follow the same settings and/or
formatting used on output and it controls that the output is properly
ordered (e.g. the output from different reports is not interleaved
which would break readability and/or syntax of target output format
used for the whole group).

To support this feature, there are 4 new functions:
  - dm_report_group_create
  - dm_report_group_push
  - dm_report_group_pop
  - dm_report_group_destroy

From the naming used (dm_report_group_push/pop), it's clear the reports
are pushed onto a stack. The rule then is that only the report on top
of the stack can be reported (that means calling dm_report_output).
This way we make sure that the output is not interleaved and provides
determinism and control over the output.

Different formats may allow or disallow some of the existing report
flags controlling output itself (DM_REPORT_OUTPUT_*) to be set or not so
once the report is pushed to a group, the grouping code makes sure that
all the reports have compatible flags set and then these flags are
restored once each report is popped from the report group stack.

We also allow to push/pop non-report item in which case such an item
creates a structure (e.g. to put several reports together with any
opening and/or closing lines needed on output which pose as extra
formatting structure besides formatting the reports).

The dm_report_group_push function accepts an argument to pass any
format-specific data needed (e.g. handle, name, structures passed
along while working with reports...).

We can call dm_report_output directly anytime we need (with the only
restriction that we can call dm_report_output only for the report that
is currently on top of the group's stack). Or we don't need to call
dm_report_output explicitly in which case all the reports in a stack are
reported on output automatically once we call dm_report_group_destroy.
2016-06-20 09:26:51 +02:00
Alasdair G Kergon
ab7ade4095 post-release 2016-06-17 14:10:20 +01:00
Alasdair G Kergon
38cc03605c pre-release 2016-06-17 14:10:20 +01:00
Alasdair G Kergon
49a8d1a85e post-release 2016-06-11 00:14:00 +01:00
Alasdair G Kergon
f2d1f5e927 pre-release 2016-06-11 00:08:08 +01:00
Zdenek Kabelac
ad414e5ad6 cleanup: typo in WHATS_NEW_DM 2016-06-10 16:01:22 +02:00
Alasdair G Kergon
7c894911ae post-release 2016-06-03 23:20:43 +01:00
Alasdair G Kergon
767c9d653e pre-release 2016-06-03 23:16:50 +01:00
Alasdair G Kergon
780424639a Revert "libdm: trace missing settings"
This reverts commit 8fd886f735.

This was a deliberate omission because logging token-by-token metadata
parsing greatly increases the amount of logging for hardly any benefit.

In general, only LVM config file settings need to be logged, and in
places where it's considered important to log particular elements of
metadata that should be done using specific log_* lines.

This area can be revisited.
2016-05-27 14:35:11 +01:00
Zdenek Kabelac
8fd886f735 libdm: trace missing settings
These settings have been missed in very verbose log.
2016-05-19 18:27:34 +02:00
Zdenek Kabelac
e8ba5c9bd4 libdm: cache status reports passthrough cache mode
Report passthrough mode instead of 'Unknown feature'.
2016-05-19 18:26:07 +02:00
Alasdair G Kergon
57e9df7dc5 post-release 2016-05-14 02:12:23 +01:00
Alasdair G Kergon
15ca5883fb pre-release 2016-05-14 01:57:42 +01:00
Alasdair G Kergon
e6cafdad36 libdm: Show lib vsn even if driver vsn unavailable. 2016-05-12 01:14:25 +01:00
Alasdair G Kergon
04987e7f49 post-release 2016-05-07 00:48:40 +01:00
Alasdair G Kergon
e4caf0beeb pre-release 2016-05-07 00:36:59 +01:00
Alasdair G Kergon
795e47cec5 post-release 2016-04-30 01:12:33 +01:00
Alasdair G Kergon
e53ecf91f7 pre-release 2016-04-30 01:07:26 +01:00
Alasdair G Kergon
16019b518e libdm: Add dm_udev_wait_immediate.
dm_udev_wait() waits inside the library.
dm_udev_wait_immediate allows the caller to do other things if the
cookie isn't yet ready to be decremented.
2016-04-28 00:54:27 +01:00
Alasdair G Kergon
eb8edccd58 post-release 2016-04-23 00:43:13 +01:00
Alasdair G Kergon
546b2006dd pre-release 2016-04-23 00:41:55 +01:00
Zdenek Kabelac
e2ceb90095 debug: update message in libdm
When dm_tree_find_node_by_uuid() fails to find passed uuid,
report in lof_debug the complete original uuid,
not the one stripped of LVM- prefix.

TODO: inspect manipulation with LVM- prefix here.
2016-04-18 12:32:56 +02:00
Alasdair G Kergon
3aab784aa5 pre-release 2016-04-09 02:08:44 +01:00
Zdenek Kabelac
e2d4f53c82 WHATS_NEW: update
doc for previous commits.
2016-04-07 22:31:40 +02:00
Alasdair G Kergon
76fc41fb9d post-release 2016-04-01 20:36:40 +01:00
Alasdair G Kergon
2d0d58b867 pre-release 2016-04-01 20:29:52 +01:00
Alasdair G Kergon
d6e8f18e4d post-commit 2016-03-26 09:07:21 +00:00
Alasdair G Kergon
b9d07f7a12 pre-release 2016-03-26 09:04:50 +00:00
Alasdair G Kergon
e58d24293f post-release 2016-03-19 01:18:28 +00:00
Alasdair G Kergon
0d4b6bdfc0 pre-release 2016-03-19 01:14:29 +00:00
Alasdair G Kergon
a78e696070 post-release 2016-03-11 00:21:53 +00:00
Alasdair G Kergon
2159a1429d pre-release 2016-03-11 00:19:16 +00:00
Zdenek Kabelac
29d1533a49 libdm: parse more info from cache status
Parse Fail/Error/need_check/ro status info from cache.
2016-03-10 18:38:53 +01:00
Alasdair G Kergon
7b15ca5c9a post-release 2016-03-04 18:06:24 +00:00
Alasdair G Kergon
68ec240b99 pre-release 2016-03-04 17:59:21 +00:00
Peter Rajnoha
9720898c8e libdm: config: fix dm_config_write_node and variants to properly return error on failures
The error was not propagated if _write_config (that is part of
dm_config_write_node and all its variants) was called recursively
for subsections.
2016-03-04 15:51:13 +01:00
Peter Rajnoha
967a0889a0 libdm: config: remove 4096 char limit due to buffer size if writing dm_config_node 2016-03-04 14:59:22 +01:00
Alasdair G Kergon
4013e21ba8 post-release 2016-02-26 21:14:12 +00:00
Alasdair G Kergon
731a9c1354 pre-release 2016-02-26 21:03:30 +00:00
Zdenek Kabelac
6d6e063a0f libdm: fix string boundary
The test for string 'end' needs to account for ending \0,
which also needs to fit <SIZE.
2016-02-23 21:38:52 +01:00
Zdenek Kabelac
275c9f7e77 libdm: grow with initialized struct content
Coverity noticed struct hist has been copied uninitalized into mempool.
2016-02-22 14:17:32 +01:00
Alasdair G Kergon
44b3909e58 post-release 2016-02-21 23:37:48 +00:00
Alasdair G Kergon
3ef36f05b6 pre-release 2016-02-21 23:17:24 +00:00
Zdenek Kabelac
0fb3669d49 libdm: thin status update
Fix parsing of 'Fail' status (using capital letter) for thin-pool.
Add also parsing of 'Error' state for thin-pool.
Add needs_check test for thin-pool.

Detect Fail state for thin.
2016-02-18 16:45:42 +01:00
Alasdair G Kergon
952498ef4d post-release 2016-02-15 10:48:55 +00:00
Alasdair G Kergon
228b8245e4 pre-release 2016-02-15 10:35:16 +00:00
Zdenek Kabelac
0baf66a992 dm: alloc always 8byte aligned
Fixing regression caused by 197b5e6dc7.
So the 'TODO' part now finally know the answer - there is 'sparc64'
architecture which imposes limitation to read 64b words only through
64b aligned address.

Since we never could know how is the user going to use the returned
pointer and the userusually expects it's aligned on the highest CPU
required alignement, preserve it also for char*.

Fixes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=809685
Reported-by: Anatoly Pugachev <matorola@gmail.com>
2016-02-11 18:35:05 +01:00
M.H. Tsai
f91622741f dm: fix thin-pool targer params order
Wrong thin-pool feature flag ordering in dm table: It will lead to
unnecessary table reload.

Fix it by placeing feature flags in order they are returned from the
kernel so current 'table line diff' code will not see a difference.
2016-02-11 18:32:24 +01:00
Alasdair G Kergon
0ad40a76c0 post-release 2016-01-25 01:12:27 +00:00
Alasdair G Kergon
d05d7d974c pre-release 2016-01-25 01:08:16 +00:00
Zdenek Kabelac
640c45d5a4 man: dmsetup
Typo in CMD_UDEVCREATECOOKIE macro name noticed by rpmlint.
2016-01-21 12:10:26 +01:00
Alasdair G Kergon
7f62777041 post-release 2016-01-16 02:12:10 +00:00
Alasdair G Kergon
0faa27d4f5 pre-release 2016-01-16 02:11:21 +00:00
Alasdair G Kergon
0dac4f09b4 post-release 2016-01-08 18:51:08 +00:00
Alasdair G Kergon
04b82a8126 pre-release 2016-01-08 18:46:41 +00:00
Alasdair G Kergon
1be56e46c4 post-release 2015-12-14 12:25:48 +00:00
Alasdair G Kergon
3e8126a66a pre-release 2015-12-14 12:24:21 +00:00
Riku Voipio
7a4badc07f fix static linking
Static linking fails currently, as -lm and -lpthread are missing:

gcc -O2  -fPIC -O2  -L../libdm -L../lib -L../libdaemon/client -static
-L../libdm/ioctl \
      -o dmsetup.static dmsetup.o -ldevmapper    -lrt
../libdm/ioctl/libdevmapper.a(libdm-stats.o): In function
`dm_stats_create_region':
libdm-stats.c:(.text+0x2d69): undefined reference to `log10'
libdm-stats.c:(.text+0x2d6e): undefined reference to `lround'
../libdm/ioctl/libdevmapper.a(pool.o): In function `dm_pool_create':
pool.c:(.text+0x134): undefined reference to `pthread_mutex_lock'
pool.c:(.text+0x14f): undefined reference to `pthread_mutex_unlock'

Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
2015-12-11 20:15:51 +01:00
Alasdair G Kergon
94dab390ef dmeventd: Extend checks on client socket.
Reinstate and extend checks removed by e1b111b02a.

The code has always assumed that only root has access to the directory
containing the fifos and that they are under the complete control of
dmeventd code.  If anything is found not to be as expected, then open()
should certainly not be attempted!
2015-12-08 00:59:39 +00:00
Alasdair G Kergon
00bab9d9cd post-release 2015-12-05 15:36:22 +00:00
Alasdair G Kergon
063b353b28 pre-release 2015-12-05 15:33:19 +00:00
Zdenek Kabelac
86e7894ecc cleanup: use dm_get_status_mirror
Use libdm function to parse mirror status report.
2015-12-01 13:03:16 +01:00
Zdenek Kabelac
fa87979004 libdm: introduce dm_get_status_mirror
Add missing function to parse mirror status.
2015-12-01 13:00:43 +01:00
Alasdair G Kergon
cd4d2cff97 post-release 2015-11-28 01:29:00 +00:00
Alasdair G Kergon
b4a3aaf910 pre-release 2015-11-28 01:25:53 +00:00
Zdenek Kabelac
d582be43d4 libdm: const raid params and error for unsupported type
Accept const struct with raid params (No API change).
Also add extra error message when raid type is unsupported.
2015-11-26 09:27:04 +01:00
Zdenek Kabelac
6ca5447e0c libdm: enhance thin-pool preload
When preloading thin-pool device node for already
existing/running thin-pool do not resume such thin-pool.

This allows to properly schedule commit point for metadata,
when thin-pool data or metadata volume is resized.
2015-11-23 23:34:46 +01:00
Zdenek Kabelac
ddbf0075b1 libdm: drop extra space from cache target line
Extra space between 'cache' target and metadata device caused
string comparation being not equal and thus always causing
table reload even when uneeded.
2015-11-23 23:33:37 +01:00
Alasdair G Kergon
c026846739 post-release 2015-11-23 03:40:34 +00:00
Alasdair G Kergon
369bc264b0 pre-release 2015-11-23 03:37:54 +00:00
Zdenek Kabelac
d4288c9bdf libdm: check for null from pool strdup
Unlikely to happen, but Coverity shown we may have possible
derefer NULL pointer.
2015-11-16 01:16:09 +01:00
Zdenek Kabelac
3cadc1c87e libdm: add test for dm_task_get_message_response()
Coverity notices dm_task_get_message_response() result should be
checked for NULL which should not be passed to dm_pool_strdup().
2015-11-09 10:19:19 +01:00
Zdenek Kabelac
297d6773af dmsetup: add missing checks for dm_stats_create() ret value
Coverity likes to see a check for dms not being NULL, so
add those missing ones...
2015-11-09 10:19:19 +01:00
Zdenek Kabelac
8b857bfdc6 libdevmapper-event: fix fifo leak on error path
Coverity: when _init_client() fails, client fifo could have
been already openned and needs to be closed on error path.
2015-11-09 10:00:13 +01:00
Alasdair G Kergon
af6adec7cc post-release 2015-11-09 01:48:57 +00:00
Alasdair G Kergon
a3f77ed4ba pre-release 2015-11-09 01:45:22 +00:00
Alasdair G Kergon
7831a65091 post-release 2015-10-31 01:35:47 +00:00
Alasdair G Kergon
15a97cc610 pre-release 2015-10-30 15:34:00 +00:00
Zdenek Kabelac
099466939e thin: dmeventd plugin check number of failures
If plugin's lvm command execution fails too often (>10 times),
there is no point to torture system more then necessary, just log
and drop monitoring in this case.
2015-10-29 12:14:20 +01:00
Zdenek Kabelac
5d76bdcdbd dmeventd: event string parser handles empty field
Improve event string parser to avoid unneeded alloc+free.

Daemon talk function uses '-' to mark NULL/missing field.
So restore the NULL pointer back on parser.

This should have made old tools like 'dmevent_tool' work again.
As now 'uuid' or 'dso' could become NULL and then be
properly used in _want_registered_device() function.

Since lvm2 always fill these parameters, this change should
have no effect on lvm2.
2015-10-27 11:42:40 +01:00
Zdenek Kabelac
9ef820a2a5 libdm: dm_tree_node_size_changed recognizes reduction
Add more functionality to size_changed function.
While 'existing' API only detected  0 for
unchanged,  and  for changed,
new improved API will also detected if the
size has only went bigger - or there was
size reduction.

Function work for the whole dm-tree - so
no change is size is always 0.
only size extension  1.
and if some size reduction is there - returns -1.

This result can be used for better evaluation
whether we need to flush before suspend.
2015-10-25 21:05:15 +01:00
Zdenek Kabelac
2af696c32f dmeventd: exit on idle
Implementing exit when 'dmeventd' is idle.
Default idle timeout set to 1 hour - after this time period
dmeventd will cleanly exit.

On systems with 'systemd' - service is automatically started with
next contact on dmeventd communication socket/fifo.

On other systems - new dmeventd starts again when lvm2 command detects
its missing and monitoring is needed.
2015-10-22 22:43:03 +02:00
Zdenek Kabelac
12aa56d298 dmeventd: handle signal from plugin
Add support to unmonitor device when monitor recognizes there is
nothing to monitor anymore.

TODO: possibly API change with return value could be also used.
2015-10-22 22:40:07 +02:00
Zdenek Kabelac
9156c5d088 dmeventd: rework locking code
Redesign threading code:

- plugin registration runs within its new created thread for
  improved parallel usage.

- wait task is created just once and used during whole plugin lifetime.

- event thread is based over  'events' filter being set - when
  filter is 0, such thread is 'unused'.

- event loop is  simplified.

- timeout thread is never signaling 'processing' thread.

- pending of events filter cnange is properly reported and
  running event thread is signalled when possible.

- helgrind is not reporting problems.
2015-10-22 22:39:24 +02:00
Zdenek Kabelac
81e9ab3156 dmeventd: code mode _get_device_status
Move _get_device_status() in code.
Use dm_task_no_flush() function when reading status.
(e.g. none blocking for thins pool)
2015-10-22 22:35:25 +02:00
Zdenek Kabelac
02eb000f51 dmeventd: use dm_hold_control_dev
Need here to keep  control device opened while there is 'any' dso
plugin loaded - otherwise there would a race closing controlfd
inside lvm2 plugin while some other monitoring thread would
tried to execute another WAITEVENT task.
2015-10-22 22:34:27 +02:00
Zdenek Kabelac
fa9e41d2e3 dmeventd: thin plugin update
Use  dm_make_percent for percentage calculation like lvm2 command.

Use a single call for resize.
2015-10-22 22:33:07 +02:00
Zdenek Kabelac
7ff5b03e5e dmeventd: snapshot plugin updates
Improve test for invalid snapshot.

Use dm_make_percent() to manipulate with exactly same percentage
as lvm2 command is using.
2015-10-22 22:29:50 +02:00
Zdenek Kabelac
09a62cca0c libdm: add dm_hold_control_dev
Support hold of control device open.
Useful for daemons so the control device is not frequently reopenned.
2015-10-22 22:27:31 +02:00
Peter Rajnoha
508f0f5a21 libdm: add dm_report_compact_given_fields
dm_report_compact_given_fields is the same as dm_report_compact_fields,
but it processes only given fields, not all the fields in the report
like dm_report_compact_field does.
2015-10-16 17:05:54 +02:00
Zdenek Kabelac
4b586ad3c2 dmeventd: rework raid plugin
Switch to per-thread mem-pool and lock only for lvm2 calls.
Use libdm parser for raid status line.
2015-10-13 16:02:19 +02:00
Zdenek Kabelac
256e432e78 dmeventd: less locking mirror
Rework mirror plugin to use per-thread mem-pool.
This allows to use locking only for lvm2 library calls.
2015-10-13 16:02:18 +02:00
Zdenek Kabelac
51ff7d5ed8 dmeventd: less locking for snapshot and thin
Use lvm lock for lvm library calls.

dm functions in-use are 'thread-safe' since we use
local per-thread mem pool.
2015-10-13 16:01:41 +02:00
Zdenek Kabelac
49e11102c7 dmeventd: add local mempool for raid and mirror
Using local mempools allows to drop locks when such memory is needed.
2015-10-13 15:56:23 +02:00
Zdenek Kabelac
76ea01dd20 dmeventd: new initialization of plugin threads
Rework thread creation code to better use resources.

New code will not leak 'timeout' registered thread on error path.

Also if the thread already exist - avoid creation of thread
object and it's later destruction.

If the race is noticed during adding new monitoring thread,
such thread is put on cleanup list and -EEXIST is reported.
2015-10-13 15:55:05 +02:00
Zdenek Kabelac
e261af52eb dmeventd: handle snapshot overflow
When snapshot reports overflow, handle it in the same way as Invalid.
Until better ideas are implemented.
2015-10-13 15:15:44 +02:00
Zdenek Kabelac
915f0faac1 dmeventd: syslog -> log_xxxxx
Convert logging of dmeventd to libdm logging macros.
2015-10-13 14:43:30 +02:00
Zdenek Kabelac
7e1c08bb6a dmeventd: correct ret code for fail
As  _do_register_device() calls  register_device() function that returns
1 success & 0 fail -  ret = -ENOMEM for fail case instead of 0.
2015-10-13 14:38:49 +02:00
Zdenek Kabelac
5695c6aca6 libdm: enforce writethrough mode for cleaner
With "cleaner" policy always use 'writethrough' mode.
2015-10-13 14:35:48 +02:00
Peter Rajnoha
5f7a94a03e blkdeactivate: recognize and deactivate MD devices too 2015-10-06 13:25:41 +02:00
Alasdair G Kergon
0173c260d8 libdm: Move status fns from deptree to targets.
libdm-deptree is only for functions working with dm tree nodes.
2015-09-28 20:28:31 +01:00
Heinz Mauelshagen
4e60e62444 raid: Fix raid target write_behind parameter.
Now uses correct "max_write_behind" instead of "writebehind".
(Includes some tidying up.)
2015-09-23 15:53:27 +01:00
Peter Rajnoha
cb82919b0d systemd: use {local,remote}-fs-pre.target instead of {local,remote}-fs.target
We want most of our units to be started before any local/remote mount
points are mounted - we used {local,remote}-fs.target for this purpose
before, but it was not 100% correct as there's even {local,remote}-fs-pre.target
special systemd unit reserved for this exact purpose.

See also man 7 systemd.special and "local-fs-pre.target"/"remote-fs-pre.target"
description.
2015-09-23 13:30:51 +02:00
Alasdair G Kergon
3a8a37187d post-release 2015-09-22 16:06:07 +01:00
Alasdair G Kergon
629398d0f2 pre-release 2015-09-22 16:00:10 +01:00
Zdenek Kabelac
11d6f81316 man: enhance dmsetup/dmstats
Document more supported options.
Cleanup man-style when documenting options.
Use .PD 0  and .HP
2015-09-18 17:45:46 +02:00
Zdenek Kabelac
f9c8cefd06 dmsetup: improve help text
Document more options.
2015-09-18 17:45:45 +02:00
Zdenek Kabelac
791e76ff70 dmsetup: use noflush with force removal
When user specifies '--force' with remove/remove_all/wipe_table
use '--noflush --nolockfs' resume flags, so the operation
will not block when device underneath is blocked.
2015-09-18 17:45:45 +02:00
Zdenek Kabelac
e0d915a873 libdm: parse Overflow string from snapshot status
This is likely to be a new 'info' provided by kernel
snapshot target.
For now just parse this string.
2015-09-18 17:45:45 +02:00
Peter Rajnoha
5bc8c713e2 WHATS_NEW: commit 6c0b4a2769 2015-09-17 14:36:39 +02:00
Peter Rajnoha
afdae26c71 libdm: dev_node: use lstat instead of stat while removing and renaming nodes
When using udev, the /dev/mapper entries are symlinks - fix the code
to count with this.

This patch also fixes the dmsetup mknodes and vgmknodes to properly
repair /dev/mapper content if it sees dangling symlink in /dev/mapper.
2015-09-17 13:37:15 +02:00
Peter Rajnoha
b5022102bb libdm: report: make it possible to use blank value as selection for string list report field
$ lvs -o name,tags vg
  LV    LV Tags
  lvol0
  lvol1 mytag

Before this patch:
$ lvs -o name,tags vg -S 'tags=""'
  Failed to parse string list value for selection field lv_tags.
  Selection syntax error at 'tags=""'.
  Use 'help' for selection to get more help.

(and the same for -S 'tags={}' and -S 'tags=[]')

With this patch applied:
$ lvs -o name,tags vg -S 'tags=""'
  LV    LV Tags
  lvol0

(and the same for -S 'tags={}' and -S 'tags=[]')
2015-09-17 10:19:15 +02:00
Alasdair G Kergon
0ac10bb23a post-release 2015-09-15 14:09:10 +01:00
Alasdair G Kergon
a729b1aa29 pre-release 2015-09-15 13:17:50 +01:00
Zdenek Kabelac
c356991fa8 libdm: no validate for pool without messages
Avoid validation of free space in pool, when no messages are passed.

Patch a3c7e326c3 add new check for
pool overload - but this check should not be made if there are
no messages and transaction_id is still within 'bounds' (bigger by 1).
2015-09-14 20:18:54 +02:00
Alasdair G Kergon
2a022e9e6e post-release 2015-09-05 23:58:40 +01:00
Alasdair G Kergon
f5a3b05c7a pre-release 2015-09-05 23:46:22 +01:00
Bryn M. Reeves
f868624f85 WHATS_NEW_DM: fix histogram entries for 1.02.107
The histogram entries were under the wrong version (1.02.106). Fix
that and describe the library changes in more detail.
2015-09-04 19:53:10 +01:00
Zdenek Kabelac
a3c7e326c3 libdm: relocate parsing of thin-pool status
Use single routine for parsing status.

Internally we do not need to allocate pool memory for
passed struct.
2015-09-03 23:34:36 +02:00
Peter Rajnoha
fc35b6988d libdm: pkgconfig: fix devmapper.pc to not reference nonexistent rt.pc file
librt doesn't have a pkgconfig file so use Libs.private: -lrt instead
to declare the dependency directly.

The same applies for -lm which is also used and which hasn't been
defined in the devmapper.pc file yet.
2015-09-03 09:28:42 +02:00
Bryn M. Reeves
3c0fc6f0da dmstats: add histogram support
Add support to dmstats to create and report histograms.

Add a --histogram switch to 'create' that accepts a string
description of bin boundaries and DR_STATS and DR_STATS_META fields
to report bin configuration and absolute and relative histogram
values:

  hist_bins
  hist_bounds
  hist_ranges
  hist_count
  hist_count_bounds
  hist_count_ranges
  hist_percent
  hist_percent_bounds
  hist_percent_ranges

A new 'histogram' subcommand displays a report that emphasizes
histogram data as either counters or percentage values.
2015-09-02 21:02:12 +01:00
Bryn M. Reeves
a0cf3d47f1 libdm: add latency histogram support
Add support for creating, parsing, and reporting dm-stats latency
histograms on kernels that support precise_timestamps.

Histograms are specified as a series of time values that give the
boundaries of the bins into which I/O counts accumulate (with
implicit lower and upper bounds on the first and last bins).

A new type, struct dm_histogram, is introduced to represent
histogram values and bin boundaries.

The boundary values may be given as either a string of values (with
optional unit suffixes) or as a zero terminated array of uint64_t
values expressing boundary times in nanoseconds.

A new bounds argument is added to dm_stats_create_region() which
accepts a pointer to a struct dm_histogram initialised with bounds
values.

Histogram data associated with a region is parsed during a call to
dm_stats_populate() and used to build a table of histogram values
that are pointed to from the containing area's counter set. The
histogram for a specified area may then be obtained and interogated
for values and properties.

This relies on kernel support to provide the boundary values in
a @stats_list response: this will be present in 4.3 and 4.2-stable. A
check for a minimum driver version of 4.33.0 is implemented to ensure
that this is present (4.32.0 has the necessary precise_timestamps and
histogram features but is unable to report these via @stats_list).

Access methods are provided to retrieve histogram values and bounds
as well as simple string representations of the counts and bin
boundaries.  Methods are also available to return the total count
for a histogram and the relative value (as a dm_percent_t) of a
specified bin.
2015-09-02 20:48:59 +01:00
Alasdair G Kergon
cb57f4f89b libdm: Reinstate dm_task_get_info@Base.
Move the version script local:* wildcard into a node of its own
to avoid conflicting with in-source export macro definitions.
2015-09-01 16:26:02 +01:00
Alasdair G Kergon
d797f4d590 post-release 2015-08-26 23:13:34 +01:00
Alasdair G Kergon
a37fd93fbb pre-release 2015-08-26 23:11:13 +01:00
Bryn M. Reeves
463f59eca4 dmstats: add 'precise' flag field to stats report
Add a flag indicating whether or not precise_timestamps are enabled for
a given region or area.
2015-08-24 20:03:21 +01:00
Bryn M. Reeves
e4145ebc47 dmstats: add --precise switch to enable nanosecond counters. 2015-08-24 20:03:21 +01:00