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Avoid problems for other libc like muslc and use dm_basename.
Prototype for basename has been removed from string.h from latest musl [1]
compilers e.g. clang-18 flags the absense of prototype as error. therefore
include libgen.h for providing it.
[1] https://git.musl-libc.org/cgit/musl/commit/?id=725e17ed6dff4d0cd22487bb64470881e86a92e7
Reported-by: Khem Raj <raj.khem@gmail.com>
Add debug tracing for syscall failures.
Also switch some log_error to log_warn when command does not exit
with 'error' result and only warns user.
Easier error path handling.
Initialize some vars at declaration time.
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.
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.
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.
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.
If lvm.conf has use_devicesfile=0 and /etc/lvm/device/system.devices
exists, then rename it to system.devices-unused.YYYYMMDD.HHMMSS.
This prevents an old, incorrect system.devices from being used in
the future if lvm.conf is changed to use_devicesfile=1.
Create backup copies of system.devices in /etc/lvm/devices/backup
named system.devices-YYYYMMDD.HHMMSS.NNNN. NNNN is the version
counter from the file.
Each time that an lvm command writes a new system.devices file,
it also writes the same file in the backup directory.
A new comment line is added to system.devices with HASH=<num>
where <num> is a crc calculated from the uncommented lines in
system.devices. This lets lvm detect if the file has been
modified outside of lvm itself.
If system.devices is edited directly, the next time a command
reads the file, the crc will not match the HASH value. The
command will then rewrite system.devices with the correct HASH
value, and create a backup reflecting the edits.
A default limit of 50 backup files is kept, configurable by
lvm.conf devicesfile_backup_limit (set to 0 to disable backups.)
Since understanding the reason for choosing the appmachineid over the
direct use of machineid is not easily found, I extended to help text to
clarify this a bit.
