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Setting db_persist is required for dm devices so that their properties
are carried over on switch-root from the initrd to the rootfs. This
logic has always lived in dracut
(https://github.com/dracutdevs/dracut/blob/master/modules.d/90dm/11-dm.rules).
However, this means that other initramfs generators each have to
implement and maintain the same rule which leads to unnecessary
duplication.
Instead, let's make the rule part of the upstream lvm rules, which
will ensure that generated initramfses will just work if they make
sure the lvm udev rules are installed, without having to figure out
that they have to add an extra rule themselves on top.
Identical rule in Arch Linux's lvm2 package: https://gitlab.archlinux.org/archlinux/packaging/packages/lvm2/-/blob/main/11-dm-initramfs.rules?ref_type=heads
For DM devices, the add/change/remove can appear as action for genuine
udev events.
However, there are more action types (bind, unbind, move, online, offline)
which never appear as actions for genuine DM udev events, but they can
still be synthesized (e.g. by writing "<action>" to "/sys/.../uevent" file
or by calling "udevadm trigger --action=<action>").
Let's also process these extra action types so that the udev-related content
is not lost completely, keeping all the symlinks and udev db entries just like
this was a synthetic udev event with "change" action.
Related to https://gitlab.com/lvmteam/lvm2/-/issues/4.
Bump the rules version in order to indicate that upper level rules
should consume DM_UDEV_DISABLE_OTHER_RULES_FLAG rather than DM_NOSCAN
and DM_SUSPENDED.
Also update the comments at the top of the file that describe the
exported properties, and add a note about internal device-mapper
properties.
Signed-off-by: Martin Wilck <mwilck@suse.com>
Reviewed-by: Peter Rajnoha <prajnoha@redhat.com>
DM_NOSCAN is not an official API any more and doesn't have to be
restored from the udev db. Rename it to .DM_NOSCAN.
Signed-off-by: Martin Wilck <mwilck@suse.com>
Reviewed-by: Peter Rajnoha <prajnoha@redhat.com>
DM_SUSPENDED is a device-mapper internal flag, which is not intended to be
used by other rules, and which is determined by 10-dm.rules from sysfs for
every uevent. Rename it to ".DM_SUSPENDED", so that it won't be saved in the
udev database.
Known consumers of DM_SUSPENDED are 66-kpartx.rules (from multipath-tools) and
99-systemd.rules (from systemd). These will have to be adapted.
11-dm-mpath.rules will be changed to use .DM_SUSPENDED.
Signed-off-by: Martin Wilck <mwilck@suse.com>
Reviewed-by: Peter Rajnoha <prajnoha@redhat.com>
DM_UDEV_DISABLE_OTHER_RULES_FLAG is used as the "output" flag of the
device-mapper rules, to be consumed by non-dm rules. It is a logical OR of
several conditions that might make dm devices inaccessible. 10-dm.rules
calculates it for every uevent, whether it's genuine or spurious.
DM_SUBSYSTEM_UDEV_FLAG0 is just another flag that needs to be or'd in. We
don't need to restore the previous state of DM_UDEV_DISABLE_OTHER_RULES_FLAG.
Actually, doing so is wrong if the flag has previously been set because the
device was suspended, and the device isn't suspended anymore.
Signed-off-by: Martin Wilck <mwilck@suse.com>
Reviewed-by: Peter Rajnoha <prajnoha@redhat.com>
We use DM_UDEV_DISABLE_OTHER_RULES_FLAG to tell upper non-DM layers
to keep their hands off the device in question, for any reason.
One possible reason is that the device is supended; another is that
the cookie carries the flag of the same name.
DM_SUSPENDED is not restored from the db, but evaluated anew for every
uevent. Therefore DM_UDEV_DISABLE_OTHER_RULES_FLAG shouldn't be
restored, either. Use a new variable DM_COOKIE_DISABLE_OTHER_RULES_FLAG
to save and restore the original value from the cookie.
Signed-off-by: Martin Wilck <mwilck@suse.com>
Reviewed-by: Peter Rajnoha <prajnoha@redhat.com>
DISK_RO is set in the environment of a block-device uevent if and only if
the read-only (ro) attribute of the device just changed (the kernel
function set_disk_ro() was called). It is not synoymous with the "ro" sysfs
attribute; the device could very well be write-protected if DISK_RO is not
set. Device mapper-level probing is possible for DISK_RO events, but it makes
little sense, because the device propreties haven't changed as far as dm is
concerned. But we should import possible previously set device properties
to avoid confusing follow-up rules. We should do this for both DISK_RO=1
and DISK_RO=0 events.
Signed-off-by: Martin Wilck <mwilck@suse.com>
Reviewed-by: Peter Rajnoha <prajnoha@redhat.com>
ID_FS_TYPE is the most important udev property for most follow-up
rules. It must be imported from the udev db if blkid can't be run.
Signed-off-by: Martin Wilck <mwilck@suse.com>
Reviewed-by: Peter Rajnoha <prajnoha@redhat.com>
When using cached LV with cachevols (so not with cachepool),
the loaded table could have been using more then one mapping line
for sub devices - resulting into data corruption in some cases
when i.e. taking snapshot of such cached LV with and instead of
single line - 2 lines were generated into DM table as the code
skipped protection again repeated addition.
vg-fast_cvol-cdata: 0 16384 linear 253:2 16384
vg-fast_cvol-cdata: 16384 16384 linear 253:2 16384
New code is also refactoring to use _add_new_cvol_subdev_to_dtree
(similar _add_cvol_subdev.. ) and also the addition of subdev has
been moved after check for already processed node.
Also the cachevol sub devices are now added with the insertion
of cachevol with cached LV.
Document usage of chaining external origins as it is now possibly to
create thinA LV in poolA which use thinB LV in poolB as it external
origin and user could create chain of such LV.
When using swap_lv_identifiers() we were basiclly exchanging 'names'
and only according to the caller some more data were 'transfered'.
However in most cases we should swap properties like 'hostname' as
the creation information should be preserved.
So let's do the function more universal.
Improve support for building DM tree when there is a chain
of external origins used for LV.
For this we cannot use track_external_lv_deps as this works
only for LV with just one external origin in its device tree.
Instead add directly 'dev' to the instead of add whole LV.
This avoid possibly recurive endless loop, however we may eventally
have some problems with undiscovered/missing devices in DM tree.
When we have some existing LV and this LV is being converted to
external origin - during the DM table manipulation there is a short
moment when the LV is being 'resumed' as 'read-only' volume
while still being live as 'rw' volume i.e. we could have had
a single thin LV active twice.
To avoid such weird scenarios of dual access to a same volume, we
just postpone a resume until a moment, where the existing volume
is already suspended thus no I/O can be in flight to such device.
Note: however there is slight catch - that we now have basically
a different 'risk' case where a resume of such i.e. new external
origin LV might fail and we are already in suspend tree state -
resolving error path in this situation is untrivial as well...
Fix/support creation and usage of the external origin
across thin-pools - so thin LV can use thin LV from
some other thin-pool as external origin (read-only).
When creating external origin via 'lvcreate --type thin'
add the validation for LV being usable as external origin
since certain LVs cannot be really used this way.
Also call this function early during lvcreate cmdline arg
validation se we do not need to do unecesary operation.
Over the time the code for preloading detached LVs got unnecessarily
complicate. But actually we need to preload only LVs that
were previously non-toplevel (invisible) LVs and became visible
toplevel LVs in the precommitted metadata.
If there would be needed some other rule, it would likely be a bug in
conversion code forgetting to set visibility flag on detached LV.
This reduces number of unnecessary repeated DM tree preloading.
When building in other dir, ensure srcdir is used to find helper
script (via vpath) through $< usage.
Add also missing [INSTALL] prints for some installed files.
External origins for thin volumes can be also used at the same time
as old(thick) snapshot origins. However in this case it's possible
the LV is only active as being 'external' origin, but old snapshot LVs
are not active. For this case before handling these
LVs for un/monitoring check the active state of origin LV.
This should prevent warnings of monitoring failures.
Make recursive directory path creation reusable via
dir_create_recursive.
While we already have dm_create_dir() - it's not taking mode arg,
so let's make lvm's internal file helper function.
Instead of parsing the whole /proc/kallsyms use faster variant
of using modprobe tool logic.
lvm2 here wants to know whether the particular DM cache policy is
present in the kernel - however since the cache policy does not have
any kernel module parameters and it can be built-in to a kernel
there is no /sys/modules directory in such case and we would need to call
modprobe everytime we want detect such case.
The old solution tried to look for particular kernel symbol
(and like not the right way, as smq_exit might be actually ommitted).
New version checks MODULES_PATH/`uname -r`/modules.builtin for
whether is present cache policy module instead of CPU expensive parsing
of kallsyms.
