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currently, lvcreate for sanlock find the free lock offset
from the beginning of the lvmlock every time.
after created thousands of lvs, it will issue thousands of read
ios for lvcreate to find free lock offset.
remeber the last free lock offset will greatly reduce the impact
Signed-off-by: Zhang Huan <zhanghuan@huayun.com>
API for strtod() or strtoul() needs reset of errno, before it's being
called. So add missing resets in missing places and some also some
errno validation for out-of-range numbers.
All the variables for sscanf in lvmlockctl.c and lvmlockd-sanlock.c are
zeroed before sscanf call so the failure is detected by seeing the zero
value instead of proper one in subsequent code - so use (void) for
sscanf calls to ignore return value here.
If a host failed while holding a sanlock lease,
sanlock_acquire will by default block and wait
for the lease to expire before returning. We
want it to return with an error so we can retry
instead of blocking, which allows us to process
other lock operations.
(Enclose this in an ifdef until the new flag
appears in a sanlock release.)
The dlm will often lose the lvb content, so we need to
check quite a few possibilities for lvb values that
were not being checked before.
Refactoring was required to pass the entire lvb value
back to the core code instead of the single value.
The only functional change should be detecting new
lvb states where metadata is now invalidated where
it wasn't before.
This adds the infrastructure, code paths, error reporting,
etc. to handle storage errors, or storage loss, under the
sanlock leases in a VG that is being used. The loss of
storage means sanlock cannot renew its leases, which means
that the host needs to stop using the shared VG before its
leases expire.
This still requires manually shutting down a VG that has
lost lease storage, e.g. unmounting file systems,
deactivating LVs in the VG. The next step is to
automatically use a command like blkdeactivate to do that.
When there are duplicate global locks, check if the gl
is still enabled each time a gl or vg lock is acquired
in the lockspace. Once one of the duplicates is disabled,
then other hosts will recognize that the issue is resolved
without needing to restart the lockspaces.
