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When converting a VG to locktype sanlock, a new
lease is allocated for each existing lv. Finding
a new lease location involved searching the lvmlock
LV from the start for an unused location, which
would be very slow with many LVs. Improve this by
starting each search from the last used location.
Fix regression from commit 7f29afdb06
"lvmlockd: configurable sanlock lease sizes on 4K disks"
That change failed to recognize that a running lockspace will not
exist in lvmlockd when converting a local VG to a sanlock VG, i.e.
vgchange --locktype sanlock vgname. When the vgchange attempted
to initialize new lv leases for existing LVs, lvmlockd would
return an error when it found no lockspace.
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.
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.
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
Mask for strncpy() Coverity report warning would
actually need to copy buffer from 'tmp_name' instead of 'str'.
But replace it directly with single 'strncpy()' again for better readbility,
just mask out the warning reported for this strncpy instance
(so we do not need to put comment fro every call of strcpy_name_len).
- Use a new function for all instances of copying
a null-terminated string into a fixed size struct
field that is not null-terminated.
- use memcpy when copying between struct fields of
the same size
When sanlock_release returns an error because of an i/o
timeout releasing the lease on disk, lvmlockd should just
consider the lock released. sanlock will continue trying
to release the lease on disk after the original request
times out.
The choice about sector size and lease align size is
now made by the sanlock user, in this case lvmlockd.
This will allow lvmlockd to use other lease sizes in
the future. This also prevents breakage if hosts
report different sector sizes, or the sector size
reported by a device changes.
As we start refactoring the code to break dependencies (see doc/refactoring.txt),
I want us to use full paths in the includes (eg, #include "base/data-struct/list.h").
This makes it more obvious when we're breaking abstraction boundaries, eg, including a file in
metadata/ from base/
When sanlock or dlm lock managers return an error number
that we don't recognize, replace it with a generic -ELMERR
which is defined in the set of special lvmlockd error
numbers. Otherwise, an unknown lock manager error number
could be misinterpreted for something else if it happened
to overlap another set of error numbers (which they have
not thus far.)
These less common errors returned from sanlock should
also cause sanlock to retry the lock acquire:
- i/o timeout occurs during sanlock_acquire().
other i/o on the same disk as the leases can cause
sanlock i/o timeouts.
- low level disk paxos contention between hosts naturally
causes one host to not acquire the lease. There are a
couple special error numbers associated with these cases
that should just be recognized as a normal failure to
acquire the lease.
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.
