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When a VG has PVs with different device id types,
it would try to use the idtype of the previous PV
in the loop. This would produce an unncessary warning,
or could lead to using the devname idtype when a better
idtype is available.
In most installations, /dev/sda* or /dev/vda* should be included
in system.devices because the root, home, etc LVs are usually on
sda or vda.
Add a special case warning when a pvscan autoactivation command
sees that /dev/sda* or /dev/vda* are excluded by system.devices,
either not listed or having a different device id.
Change messages that refer to devices being "excluded by filters"
to say just "excluded". This will avoid mistaking the word
"filters" with the lvm.conf filter setting.
It's more logical to warn about --nolocking in the man page
before it's used rather than after it's used and too late.
Also, warnings are usually for things the user may not know.
Use dev_cache_get_existing() in a few common, high level
locations where it's obvious that only existing dev-cache
entries are wanted. This can be expanded and used in more
locations (or dev_cache_get can stop creating new entries.)
When compiled and used with:
CFLAGS="-fsanitize=address -g -O0"
ASAN_OPTIONS=strict_string_checks=1:detect_stack_use_after_return=1:check_initialization_order=1:strict_init_order=1
we have few reported issue - they where not normally spotted, since
we were still accessing our own memory - but ouf of buffer-range.
TODO: there is still something to enhance with handling of #orphan vgids
. error exit means that lvmdevices --update would make a change.
. remove check of PART field from --check because it isn't used.
. unlink searched_devnames file to ensure check|update will search
The destination vg is first written with the EXPORTED flag,
then the source vg is written, then the destination vg is
written again without the EXPORTED flag. Remove an unnecessary
vg_read of the destination vg just before the second write.
Since we check for present DM devices - cache result for
futher use of checking presence of such device.
lvm2 uses cache result for label scan, but also when
it tries to activate or deactivate LV - however only simple
target 'striped' is reasonably supported.
Use disable_dm_devs to be able to control when lv_info()
get cache or uncached results.
TODO: support more type, however this is getting very complicated.
We used to reset 'settings' to their defaults after command is finished.
This however has a drawback we lose all the logging after this point.
So this patch disables this 'reset' to observe for side-effects.
lvm shell should be getting reset when next command is run -
so this might or might not have some 'hidden' effects.
ATM it looks like nothing really bad should happen - we just should be
able to get more logs - at least from normal commands.
Fixes commit "pvscan: match device arg to filter symlink"
which failed to account for the fact that filter entries
are not just path names but include "a" or "r", etc.
The device_hint name in the metadata was meant to prevent
autoactivation from md components, but the name checks were
more general and would catch unnecessary cases.
This fixes an issue related to the optimization in
"pvscan: only add device args to dev cache"
If the devices file is not used, and the lvm.conf filter
accepts devices via symlink names, then those devices won't
be accepted by pvscan for autoactivation. To resolve this,
recognize when the filter contains symlinks and disable the
optimization. When the optimization is disabled, a full
dev_cache_scan is performed, and symlinks are associated
with the device names passed to pvscan. filter-regex
will accept a device if symlinks to that device are accepted.
If the optimized label scan fails (using online files),
then clear the device state prior to falling back to the
standard label_scan. This avoids printing output about
unexpected state.
Consistently create the pvs_lookup file for VGs with
more than one PV. Previously the file create would be
skipped if all the PVs happened to already be online.
That led to unpredicatable results in an uncommon case
(when the last PV to come online is the only PV with
metadata.)
Copy another optimization from pvscan -aay to vgchange -aay.
When using the optimized label scan for only one VG, acquire the
VG lock prior to the scan. This allows vg_read to then skip the
repeated label scan that normally happens after locking the vg.
Include the device name in the /run/lvm/pvs_online/pvid files.
Commands using the pvid file can use the devname to more quickly
find the correct device, vs finding the device using the
major:minor number. If the devname in the pvid file is missing
or incorrect, fall back to using the devno.
For completeness and consistency, adjust the behavior
for some variations of:
vgchange -aay --autoactivation event [vgname]
The current standard use is with a VG name arg, and the
command is only called when all pvs_online files exist.
This is the optimal case, in which only pvs_online devs
are read. This remains the same.
Clean up behaviors for some other unexpected uses of the
command:
. With no VG name arg, the command activates any VGs
that are complete according to pvs_online. If no
pvs_online files exist, it does nothing.
. If a VG name is used but no PVs online files exist for
the VG, or the PVs online files are incomplete, then
consider there could be a problem with the pvs_online
files, and fall back to a full label scan prior to
attempting the activation.
Port another optimization from pvscan -aay to vgchange -aay:
"pvscan: only add device args to dev cache"
This optimization avoids doing a full dev_cache_scan, and
instead populates dev-cache with only the devices in the
VG being activated.
This involves shifting the use of pvs_online files from
the hints interface up to the higher level label_scan
interface. This specialized label_scan is structured
around creating a list of devices from the pvs_online
files. Previously, a list of all devices was created
first, and then reduced based on the pvs_online files.
The initial step of listing all devices was slow when
thousands of devices are present on the system.
This optimization extends the previous optimization that
used pvs_online files to limit the devices that were
actually scanned (i.e. reading to identify the device):
"vgchange -aay: optimize device scan using pvs_online files"
Port the old pvscan -aay scanning optimization to vgchange -aay.
The optimization uses pvs_online files created by pvscan --cache
to derive a list of devices to use when activating a VG. This
allows autoactivation of a VG to avoid scanning all devices, and
only scan the devices used by the VG itself. The optimization is
applied internally using the device hints interface.
The new option "--autoactivation event" is given to pvscan and
vgchange commands that are called by event activation. This
informs the command that it is being used for event activation,
so that it can apply checks and optimizations that are specific
to event activation. Those include:
- skipping the command if lvm.conf event_activation=0
- checking that a VG is complete before activating it
- using pvs_online files to limit device scanning
The information in /run/lvm/pvs_online/<pvid> files can
be used to build a list of devices for a given VG.
The pvscan -aay command has long used this information to
activate a VG while scanning only devices in that VG, which
is an important optimization for autoactivation.
This patch implements the same thing through the existing
device hints interface, so that the optimization can be
applied elsewhere. A future patch will take advantage of
this optimization in vgchange -aay, which is now used in
place of pvscan -aay for event activation.
Help bootstrapping existing shared vgs into the devices file.
Reading the vg in vgimportdevices would require locking to be
started, but vgchange lockstart won't see the vg if it's not
in the devices file. The lvmlockd locks are not protecting
vg modifications so skipping them here won't be a problem.
Resolve event_activation configure option just once.
Do not print debug_devs about 'bad' filtering, when
actually filter already printed reason for skipping
Do not trace more then once about backup being disabled.
No debug when unlinked file does not exists in pvscan.
Reporting non-PVs / "all devices" is only done by
pvs -a or pvdisplay -a, so avoid the work managing
a list of all devices in process_each_pv.
In the case when it's needed, use the results of
label_scan which already determines which devs
are not PVs.
Configure via lvm.conf log/journal or command line --journal.
Possible values:
"command" records command information.
"output" records default command output.
"debug" records full command debugging.
Multiple values can be set in lvm.conf as an array.
One value can be set in --journal which is added to
values set in lvm.conf
pvscan --cache <dev>
. read only dev
. create online file for dev
pvscan --listvg <dev>
. read only dev
. list VG using dev
pvscan --listlvs <dev>
. read only dev
. list VG using dev
. list LVs using dev
pvscan --cache --listvg [--checkcomplete] <dev>
. read only dev
. create online file for dev
. list VG using dev
. [check online files and report if VG is complete]
pvscan --cache --listlvs [--checkcomplete] <dev>
. read only dev
. create online file for dev
. list VG using dev
. list LVs using dev
. [check online files and report if VG is complete]
. [check online files and report if LVs are complete]
[--vgonline]
can be used with --checkcomplete, to enable use of a vg online
file. This results in only the first pvscan command to see
the complete VG to report 'VG complete', and others will report
'VG finished'. This allows the caller to easily run a single
activation of the VG.
[--udevoutput]
can be used with --cache --listvg --checkcomplete, to enable
an output mode that prints LVM_VG_NAME_COMPLETE='vgname' that
a udev rule can import, and prevents other output from the
command (other output causes udev to ignore the command.)
The list of complete LVs is meant to be passed to lvchange -aay,
or the complete VG used with vgchange -aay.
When --checkcomplete is used, lvm assumes that that the output
will be used to trigger event-based autoactivation, so the pvscan
does nothing if event_activation=0 and --checkcomplete is used.
Example of listlvs
------------------
$ lvs -a vg -olvname,devices
LV Devices
lv_a /dev/loop0(0)
lv_ab /dev/loop0(1),/dev/loop1(1)
lv_abc /dev/loop0(3),/dev/loop1(3),/dev/loop2(1)
lv_b /dev/loop1(0)
lv_c /dev/loop2(0)
$ pvscan --cache --listlvs --checkcomplete /dev/loop0
pvscan[35680] PV /dev/loop0 online, VG vg incomplete (need 2).
VG vg incomplete
LV vg/lv_a complete
LV vg/lv_ab incomplete
LV vg/lv_abc incomplete
$ pvscan --cache --listlvs --checkcomplete /dev/loop1
pvscan[35681] PV /dev/loop1 online, VG vg incomplete (need 1).
VG vg incomplete
LV vg/lv_b complete
LV vg/lv_ab complete
LV vg/lv_abc incomplete
$ pvscan --cache --listlvs --checkcomplete /dev/loop2
pvscan[35682] PV /dev/loop2 online, VG vg is complete.
VG vg complete
LV vg/lv_c complete
LV vg/lv_abc complete
Example of listvg
-----------------
$ pvscan --cache --listvg --checkcomplete /dev/loop0
pvscan[35684] PV /dev/loop0 online, VG vg incomplete (need 2).
VG vg incomplete
$ pvscan --cache --listvg --checkcomplete /dev/loop1
pvscan[35685] PV /dev/loop1 online, VG vg incomplete (need 1).
VG vg incomplete
$ pvscan --cache --listvg --checkcomplete /dev/loop2
pvscan[35686] PV /dev/loop2 online, VG vg is complete.
VG vg complete
With larger metadata, decoding 'localtime()' for hinting time creation
of every LV may cause excessive check of /etc/localtime file.
Set TZ to ":/etc/localtime" so glibc reads this file just once
instead of check everytime if there has anything changed.
It's basically irrelavant which value we assing to optarg,
since it's set by getopt() function, but Coverity tool
is incorrectly reporting possibly dereference of NULL.
Analyzer here was rather confused about possiblity of loosing previously
assigned device pointers - fixed by passing zero initialize memory
before first assign.
The cmd memory space is allocated by zalloc, and the registration
fails and is not released.
Although this code would be ever triggered just in the case
of some internal (likely compilation) bug.
Signed-off-by: Wu Guanghao <wuguanghao3@huawei.com>
When building lvm2 in Gentoo/ChromeOS with the ASAN memory
sanitizer enabled, man-generator fails with the following
error. Initializing makes the error go away.
* SUMMARY: MemorySanitizer: use-of-uninitialized-value /build/amd64-generic/tmp/portage/sys-fs/lvm2-2.02.187-r3/work/LVM2.2.02.187/tools/man-generator.c:3316:6 in _include_description_file
* Exiting
* ASAN error detected:
* ==2548047==WARNING: MemorySanitizer: use-of-uninitialized-value
* #0 0x558b00ab4730 in _include_description_file /build/amd64-generic/tmp/portage/sys-fs/lvm2-2.02.187-r3/work/LVM2.2.02.187/tools/man-generator.c:3316:6
* #1 0x558b00ab4730 in _print_man /build/amd64-generic/tmp/portage/sys-fs/lvm2-2.02.187-r3/work/LVM2.2.02.187/tools/man-generator.c:3426:21
* #2 0x558b00ab4730 in main /build/amd64-generic/tmp/portage/sys-fs/lvm2-2.02.187-r3/work/LVM2.2.02.187/tools/man-generator.c:3570:7
* #0 0x7fa9b2cbb807 in find_derivation /var/tmp/portage/cross-x86_64-cros-linux-gnu/glibc-2.33-r8/work/glibc-2.33/iconv/gconv_db.c:583:15
* #1 0x558b00a29559 in ?? ??:0
*
* Uninitialized value was created by an allocation of 'statbuf.i.i' in the stack frame of function 'main'
* #0 0x558b00ab1d4d in main /build/amd64-generic/tmp/portage/sys-fs/lvm2-2.02.187-r3/work/LVM2.2.02.187/tools/man-generator.c:3505
It's not a good idea to change passed 'argv[]' and replace it with
pointers to local stack - although in this case we are not using
this argv[] after return from this function.
Compilation needs to generate 'C' locale sorted command file
definitions. To always enforce 'C' sorting rules user LC_ALL
instead of LANG, as LANG settings can be overuled by
other LC settings like LC_COLLATE and may result into miscompiled
lvm2 binary if locales ordering differs from 'C'.
Reported-by: jmp-lvm2@ookaze.fr
pvid and vgid are sometimes a null-terminated string, and
other times a 'struct id', and the two types were often
cast between each other. When a struct id was cast to a char
pointer, the resulting string would not necessarily be null
terminated. Casting a null-terminated string id to a
struct id is fine, but is still avoided when possible.
A struct id is: int8_t uuid[ID_LEN]
A string id is: char pvid[ID_LEN + 1]
A convention is introduced to help distinguish them:
- variables and struct fields named "pvid" or "vgid"
should be null-terminated strings.
- variables and struct fields named "pv_id" or "vg_id"
should be struct id's.
- examples:
char pvid[ID_LEN + 1];
char vgid[ID_LEN + 1];
struct id pv_id;
struct id vg_id;
Function names also attempt to follow this convention.
Avoid casting between the two types as much as possible,
with limited exceptions when known to be safe and clearly
commented.
Avoid using variations of strcpy and strcmp, and instead
use memcpy/memcmp with ID_LEN (with similar limited
exceptions possible.)
When multiple lvchange refresh processes executed at the same time,
suspend/resume ioctl on the same dm, some of these commands will be failed
for dm aready change status, and ioctl will return EINVAL in _do_dm_ioctl function.
to avoid this problem, add READ_FOR_ACTIVATE flags in lvchange refresh process,
it will hold LCK_WRITE lock and avoid suspend/resume dm at the same time.
Signed-off-by: Long YunJian <long.yunjian@zte.com.cn>
Signed-off-by: Yi Wang <wang.yi59@zte.com.cn>
Fix memory leaks on error paths for allocated
path and backup_file name by converting allocation to
dm_pool_alloc and also change devicefile structure to contain
embeded path as last struct member - so we could allocate
only needed string size instead of PATH_MAX from pool.
TODO: still to be fixed 'mf' struct.
Recent commit 84bd394cf9
"writecache: use block size 4096 when no fs is found"
failed to account for the case where writecache is attached
to thin pool data. Checking fs block size on the thin pool
data LV is wrong, and checking the fs block on each thin LV
would be impractical, so default to 512 which cannot break
any existing file systems, and require the user to specify
4k when appropriate.
When splitting VG with thin/cache pool volume, handle pmspare during
such split and allocate new pmspare in new VG or extend existing pmspare
there and eventually drop pmspare in original VG if is no longer needed
there.
As pmspare is an invisible LV it's not getting automatically removed
since vgremove removes only visible LVs and it depending LVs.
If there was no other thin/cache pool volume, such pmspare stayed
undeleted and caused command failure.
So handle explicitelly such forgotten pmspare and remove it.
The lvm2-pvscan service runs pvscan --cache -aay <dev> for
device addition, and pvscan --cache <dev> on device removal.
For event_activation=0, the addition does nothing. Fix
device removal to also do nothing for event_activation=0.
Device removal was previously doing some work to process
the removal which slowed down stopping lvm2-pvscan services.
related to config settings:
obtain_device_info_from_udev (controls if lvm gets
a list of devices from readdir /dev or from libudev)
external_device_info_source (controls if lvm asks
libudev for device information)
. Make the obtain_device_list_from_udev setting
affect only the choice of readdir /dev vs libudev.
The setting no longer controls if udev is used for
device type checks.
. Change obtain_device_list_from_udev default to 0.
This helps avoid boot timeouts due to slow libudev
queries, avoids reported failures from
udev_enumerate_scan_devices, and avoids delays from
"device not initialized in udev database" errors.
Even without errors, for a system booting with 1024 PVs,
lvm2-pvscan times improve from about 100 sec to 15 sec,
and the pvscan command from about 64 sec to about 4 sec.
. For external_device_info_source="none", remove all
libudev device info queries, and use only lvm
native device info.
. For external_device_info_source="udev", first check
lvm native device info, then check libudev info.
. Remove sleep/retry loop when attempting libudev
queries for device info. udev info will simply
be skipped if it's not immediately available.
. Only set up a libdev connection if it will be used by
obtain_device_list_from_udev/external_device_info_source.
. For native multipath component detection, use
/etc/multipath/wwids. If a device has a wwid
matching an entry in the wwids file, then it's
considered a multipath component. This is
necessary to natively detect multipath
components when the mpath device is not set up.
expands commit d5a06f9a7d
"pvscan: skip indexing devices used by LVs"
The dev cache index is expensive and slow, so limit it
to commands that are used to observe the state of lvm.
The index is only used to print warnings about incorrect
device use by active LVs, e.g. if an LV is using a
multipath component device instead of the multipath
device. Commands that continue to use the index and
print the warnings:
fullreport, lvmdiskscan, vgs, lvs, pvs,
vgdisplay, lvdisplay, pvdisplay,
vgscan, lvscan, pvscan (excluding --cache)
A couple other commands were borrowing the DEV_USED_FOR_LV
flag to just check if a device was actively in use by LVs.
These are converted to the new dev_is_used_by_active_lv().
dev_cache_index_devs() is taking a large amount of time
when there are many PVs. The index keeps track of
devices that are currently in use by active LVs. This
info is used to print warnings for users in some limited
cases.
The checks/warnings that are enabled by the index are not
needed by pvscan --cache, so disable it in this case.
This may be expanded to other cases in future commits.
dev_cache_index_devs should also be improved in another
commit to avoid the extreme delays with many devices.
Add profilable configurable setting for vdo pool header size, that is
used as 'extra' empty space at the front and end of vdo-pool device
to avoid having a disk in the system the may have same data is real
vdo LV.
For some conversion cases however we may need to allow using '0' header size.
TODO: in this case we may eventually avoid adding 'linear' mapping layer
in future - but this requires further modification over lvm code base.
When adding a device to the devices file with --adddev, lvm
by default chooses the best device ID type for the new device.
The new --deviceidtype option allows the user to override the
built in preference. This is useful if there's a problem with
the default type, or if a secondary type is preferrable.
If the specified deviceidtype does not produce a device ID,
then lvm falls back to the preference it would otherwise use.
Previously there have been necessary explicit call of backup (often
either forgotten or over-used). With this patch the necessity to
store backup is remember at vg_commit and once the VG is unlocked,
the committed metadata are automatically store in backup file.
This may possibly alter some printed messages from command when the
backup is now taken later.
Instead of calling explicit archive with command processing logic,
move this step towards 1st. vg_write() call, which will automatically
store archive of committed metadata.
This slightly changes some error path where the error in archiving
was detected earlier in the command, while now some on going command
'actions' might have been, but will be simply scratched in case
of error (since even new metadata would not have been even written).
So general effect should be only some command message ordering.
Calling clear_hint_file() to invalidate hints would acquire
the hints flock before the global flock which could cause deadlock.
The lock order requires the global lock to be taken first.
pvchange was always invalidating hints, which was unnecessary;
only invalidate hints when changing a PV uuid. Because of the
lock ordering, take the global lock before clear_hint_file which
locks the hints file.
When the device is not a PV print
"No PV found on device ..."
instead of
"Failed to read lvm info for ... PVID ."
an earlier check had been added with a different
message for the same condition.
error reading dev and no pvid on dev were both
returning 0. make it easier for callers to
know which, if they care.
return 1 if the device could be read, regardless
of whether a pvid was found or not.
set has_pvid=1 if a pvid is found and 0 if no
pvid is found.
If a cmd def implies an LV type without --type
in the required options, then include the implied
type in the cmd def as AUTOTYPE: <type>
instead of including the redundant --type foo
in the OO list of options.
Including an implied --type in the OO list would
often cause multiple cmd defs to potentially be
identical when options were used, and a user
command could match more than one cmd def.
The AUTOTYPE values are listed in man page and
help output as
[ --type foo (implied) ]
If a user command includes --type, it will usually
match a cmd def with --type in the required options.
But, if the user command matches a cmd def with
AUTOTYPE, then the specifed --type and AUTOTYPE must
match.
The man-generator program has a new --check
option that compares cmd defs to find any cmd defs
that are equivalent with the use of options,
and should have their options adjusted.
