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For large device sets our dm_hash can produce larger amounf of mapping
collision and we would need to further increase our has size.
So instead use the radix_tree code which is immune agains growing size
of devices and uses memory more effiecently to store all the paths.
Instead of less efficient 'btree' switch dev_cache to use
radix_tree, that is generating more efficient tree mapping.
Some direct use of btree iteration replace with our dev_iter code.
Convert the persisten filter to use more memory compact radix_tree as
dm_hash is bound to preallocated number of slots and stores whole
key together with value.
When DM uuid cache is available, we can possibly avoid unnecessary
status ioctl() when we check the device for 'usable' uuid.
If this test passes the existing code will got through the full check.
Move the code around caching active dm device devno, name and uuid
from device_mapper/libdm-iface to dev_cache file - as libdm layer
cares about 'decoding' ioctl data from kernel and caching for use by
lvm stays within lvm.
Introduce:
dev_cache_update_dm_devs
dev_cache_get_dm_dev_by_devno
dev_cache_get_dm_dev_by_uuid
Use radix_tree for searching.
Do not attach layer suffix to the UUID when activating component LV.
In this case we want to see allow this LV to be public, thus
such LV should not be using -layer suffix in its UUID.
This also requires that our 'cached' access will check for
both UUID (with & without suffix) which was unnoticed issue before.
This change is now necesssary since our udev rule automatically expects
any LV with -layer suffix is private and will prevent generaring
any systemd unit even when there are no 'DM' flags bits passed via
cookie mechanism while creating such LV.
In order to free SubLVs after a stripe removing reshape, lvconvert has
to be run without layout changes. Prevent a layout changing request
in case any such freed SubLVs exist and inform the user about the fact
requesting to release them first.
Instead of using 'key state & key end' uint8_t* switch to use
void* key, & size_t keylen. This allows easier adaptation with
lvm code base with way too much casting with every use of function.
Also correctly mark const buffers to avoid compiled warnings and
casting.
Adapt the only bcache user ATM for API change.
Adapt unit test to match changed API.
Size of these hashes was quite small, so raise the size of
hashed entries to reduce amount of hash collistion.
Select some unique/unused number for hash_create below 8192.
Replace call to get_dm_uuid_from_sysfs() with use of
device_get_uuid() which gets the same information,
but instead of several syscalls it need either 1 or even 0
when the information is cached with newer kernels.
We've got cached DM list before grabbing lock, so there
is some chance, that DM table has changed and we would
need to refresh this info.
TODO: benchmark, whether it would even make sense to refresh cache
and keep it content instead of using individual ioctl() for tree build.
Function that is working with DM target is located within
lib/activate directory.
This function is able to use cached dm_device_list when possible
to quickly resolve checks for device's UUID.
Function can fully replace get_dm_uuid_from_sysfs() and instead
of syscalls for open/read/close get the UUID with single ioctl.
When there is cached dm devs list, we can get many UUID from
a single syscall.
For better use of cached data located within cmd_context,
pass this structure from the top level function.
Also add missing '_' for static _dev_cache_index_devs.
No other change here.
Skip scan and stat() for dirs and nodes within known /dev/ paths,
where no block devices are located.
Also strlen(_cache.dev_dir) just once.
TODO: add more dirs to _no_scan (configurable via lvm.conf ?)
When PVs are created on LVs, remove the devices file entries
for the PVs when the LVs are removed. In general, the devices
file entries should be removed with lvmdevices --deldev when
the LVs are removed (lvremove is the equivalent of detaching
a device from the system when layering PVs on LVs.)
This change is effectively an automatic lvmdevices --deldev
command that is built into lvremove when the LV has a PV on it.
An OS installer can create system.devices for the system and
disks, but an OS image cannot create the system-specific
system.devices. The OS image can instead configure the
image so that lvm will create system.devices on first boot.
Image preparation steps to enable auto creation of system.devices:
- create empty file /etc/lvm/devices/auto-import-rootvg
- remove any existing /etc/lvm/devices/system.devices
- enable lvm-devices-import.path
- enable lvm-devices-import.service
On first boot of the prepared image:
- udev triggers vgchange -aay --autoactivation event <rootvg>
- vgchange activates LVs in the root VG
- vgchange finds the file /etc/lvm/devices/auto-import-rootvg,
and no /etc/lvm/devices/system.devices, so it creates
/run/lvm/lvm-devices-import
- lvm-devices-import.path is run when /run/lvm/lvm-devices-import
appears, and triggers lvm-devices-import.service
- lvm-devices-import.service runs vgimportdevices --rootvg --auto
- vgimportdevices finds /etc/lvm/devices/auto-import-rootvg,
and no system.devices, so it creates system.devices containing
PVs in the root VG, and removes /etc/lvm/devices/auto-import-rootvg
and /run/lvm/lvm-devices-import
Run directly, vgimportdevices --rootvg (without --auto), will create
a new system.devices for the root VG, or will add devices for the
root VG to an existing system.devices.
