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New config setting sanlock_align_size can be used to configure
the sanlock lease size that lvmlockd will use on 4K disks.
By default, lvmlockd and sanlock use 8MiB align_size (lease size)
on 4K disks, which supports up to 2000 hosts (and max host_id.)
This can be reduced to 1, 2 or 4 (in MiB), to reduce lease i/o.
The reduced sizes correspond to smaller max hosts/host_id:
1 MiB = 250 hosts
2 MiB = 500 hosts
4 MiB = 1000 hosts
8 MiB = 2000 hosts (default)
(Disks with 512 byte sectors always use 1MiB leases and support
2000 hosts/host_id, and are not affected by this.)
Previously, lvmlockd detected the end of the lvmlock LV
by doing i/o to it until an i/o error was returned.
This triggered sanlock warning messages, so use the LV
size to avoid accessing beyond the end of the device.
Previously, every lvcreate would refresh the lvmlock LV
in case another machine had extended it. This involves
a lot of unnecessary work in most cases, so now compare
the LV size and device size to detect when a refresh is
needed.
vgchange --lockstop will fail with EBUSY if orphan locks in the
lock manager prevent stopping the lockspace. The orphan locks
can then be adopted and released, and the lockspace then stopped
cleanly.
Lock adoption is not part of standard command behavior, but can
be used for manual recovery or cleanup from unexpected failure
cases. Like other lockopt values, they are hidden options for
--lockopt. Different lock managers will behave differently.
Adopting locks with lvmlockd -A1 is more accurate and automatic.
--lockopt adoptls
. for vgchange --lockstart
. adopt existing ls, or fail if no existing lockspace is found
--lockopt adoptgl | adoptvg | adoptlv
. for commands using lvmlockd locks
. adopt orphan gl/vg/lv lock, or fail the lock request if
no orphan lock is found
. will fail if orphan lock exists with a different lock mode
. command may still continue with a failed shared lock request
--lockopt adopt
. for lockstart or any command using lvmlockd locks
. adopt existing lockspace, or start lockspace if none exists
. adopt orphan gl/vg/lv lock, or acquire new lock if no orphan found
. will fail if orphan lock exists with a different lock mode
. command may still continue with a failed shared lock request
. with dlm this option only works for ls
The lvb is used to hold lock versions, but lock verions are
no longer used (since the removal of lvmetad), so the lvb
is not actually useful. Disable their use for sanlock to
avoid the extra i/o required to maintain the lvb.
Attach -Wl,-z,relro,-z,now,-z,pack-relative-relocs,--as-needed
to LDFLAGS, but only if LDFLAGS already doesn't contain 'relro'
(so it's not given repeatedly).
Also start to use -z,now linkage also when building libraries
with default compilation - this avoid calling symbol resolver
while library function are using function needing resolving.
Note: Fedora or RHEL rpm building is using:
CFLAGS=$(rpm --eval %{build_cflags})
LDFLAGS=$(rpm --eval %{build_ldflags})
Also split -DUSE_SD_NOTIFY into DEFS from CFLAGS.
When no lock manager for the global lock had been set yet,
and the first global lock request was received, and both
dlm and sanlock were running, lvmlockd would assume it
should use the dlm for the global lock, and would start
the "lvm_global" dlm lockspace automatically. That's
not always correct, so don't assume the dlm should be used,
fail the lock request, and wait until a VG with a specific
lock type is started to determine the lock manager to use.
Fix cutting away 1 character via incorrect usage of dm_strncpy
introduced in last batch of commits and use sizeof(buffer) to
get proper sizes.
In case of use strcpy_name_len() the replacement was invalid,
so we need to restore this case since sanlock uses buffer without
nul ending, so we would strip one more character from the buffer.
Also start to use dm_strncpy() without (void) for unchecked usage.
Check for pkg-config --libs libdlm_lt and test if the returned value
contains word 'pthread' - if so, it's likely a buggy result from
incorrect config file and use directly -ldlm_lt for this case.
Convert lvmlockd to use configure _LIBS and _CFLAGS for
discovered libraries.
TODO: ATM we ignore discovered libdlm and use libdlm_lt instead.
Also libseagate_ilm is hard to find unicorn for testing.
Convert naming SYSTEMD_CFLAGS/LIB -> LIBSYSTEMD_CFLAGS/LIBS
to better fit library check for libsystemd.
Build lvmlockd with SD_NOTIFY when we have defined LIBSYSTEMD_LIBS.
If lvmlockd in cluster is killed accidently or any other reason, the
lock resources will become orphaned in the VG lockspace. When the
cluster manager tries to restart this daemon, the LVs will probably
become inactive because of resource schedule policy and thus the lock
resouce will be omited during the adoption process. This patch will
try to purge the lock resources left in previous lockspace, so the
following actions can work again.
in vgcreate for shared sanlock vg, if sanlock_write_resource
returns an unexpected error, then make init_vg_sanlock fail
which will cause the vgcreate to fail.
When storage is lost under a sanlock VG, and kill_vg/drop_vg
are used, sanlock_rem_lockspace() may return an error, but
the cleanup steps should still be performed. Without the
cleanup, gl_lsname_sanlock was not cleared. This caused
future lock requests to fail with ENOLS, but the NO_GL_LS
flag was not set due to gl_lsname_sanlock being set.
This caused lockd_global(sh) in lvm commands to fail when
they could succeed.
Fix from guozhonghua216
