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Allow RAID scrubbing on cache origin sub-LV
This patch adds the ability to perform RAID scrubbing on the cache
origin sub-LV (https://bugzilla.redhat.com/1169495). Cache origin
operations are restricted to non-clustered RAID LVs until there can
be further testing in a cluster (even for exclusive activation).
User can either specify directly _corig LV
or he can specify cache LV and operation --syncation is
passed ONLY to _corig LV.
If users wants to manipulation with cache-pool devices - he
needs to specify this object name.
Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Older udev versions (udev < v165), don't have the official
udev_device_get_is_initialized function available to query for
device initialization state in udev database. Also, devices don't
have USEC_INITIALIZED udev db variable set - this is bound to the
udev_device_get_is_initialized fn functionality.
In this case, check for "DEVLINKS" variable instead - all block devices
have at least one symlink set for the node (the "/dev/block/<major:minor>".
This symlink is set by default basic udev rules provided by udev directly.
We'll use this as an alternative for the check that initial udev
processing for a device has already finished.
It's possible (mainly during boot) that udev has not finished
processing the device and hence the udev database record for that
device is still marked as uninitialized when we're trying to look
at it as part of multipath component check in pvscan --cache code.
So check several times with a short delay to wait for the udev db
record to be initialized before giving up completely.
When scanning devs to populate lvmetad during system startup,
filter-mpath with native sysfs multipath component detection
may not detect that a dev is multipath component. This is
because the multipath devices may not be set up yet.
Because of this, pvscan will scan multipath components during
startup, will see them as duplicate PVs, and will disable
lvmetad. This will leave lvmetad disabled on systems using
multipath, unless something or someone runs pvscan --cache
to rescan.
To avoid this problem, the code that is scanning devices to
populate lvmetad will now check the udev db to see if a
dev is a multipath component that should be skipped.
(This may not be perfect due to inherent udev races, but will
cover most cases and will be at least as good as it's ever
been.)
The lsblk is just a nice helper here - it's not crucial for lvmdump so
do best effort here and use the most we can from current version of
lsblk that is installed on system. The lsblk -s option was added a bit
later after lsblk introduction and lsblk -O support even more later -
so if these are not available, use only pure lsblk output without any
extras.
- Prevent --lvmshell with --nojson, not a valid combination
- If user is preventing json, then no lvmshell usage
- Return boolean on Manager.UseLvmShell
The normal mode of operation will be to monitor for udev events until an
ExternalEvent occurs. In that case the service will disable monitoring
for udev events and use ExternalEvent exclusively.
Note: User specifies --udev the service will always monitor udev regardless
if ExternalEvent is being called too.
With the addition of JSON and the ability to get output which is known to
not contain any extraneous text we can now leverage lvm shell, so that we
don't fork and exec lvm command line repeatedly.
When we are running in a terminal it's useful to have a date & ts on log
output like you get when output goes to the journal. Check if we are
running on a tty and if we are, add it in.
Avoid monitoring of activated cache-pool - where the only purpose ATM
is to clear metadata volume which is actually activate in place
of cache-pool name (using public LV name).
Since VG lock is held across whole clear operation, dmeventd cannot
be used anyway - however in case of appliction crash we may
leave unmonitored device.
In future we may provide better mechanism as the current name
replacemnet is creating 'uncommon' table setups in case the metadata
LV is more complex type like raid (needs some futher thinking about
error path results).
Another point to think about is the fact we should not clear device
while holding lock (i.e. dmeventd mirror repair cannot work in cases
like this).
Introduce 'hard limit' for max number of cache chunks.
When cache target operates with too many chunks (>10e6).
When user is aware of related possible troubles he
may increase the limit in lvm.conf.
Also verbosely inform user about possible solution.
Code works for both lvcreate and lvconvert.
Lvconvert fully supports change of chunk_size when caching LV
(and validates for compatible settings).
Commit e947c362dd introduced
config_settings.h file for central place to store all definitions for
config options. By mistake, it used report/colums_as_rows instead
of report/columns_as_rows (missing "n" in "columns").
