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gcc warns here about storring 69 bytes in 64 byte array (losing
potentially 4 bytes from 'ls->name').
lvmlockd-core.c:2657:36: warning: ‘%s’ directive output may be truncated writing up to 64 bytes into a region of size 60 [-Wformat-truncation=]
snprintf(tmp_name, MAX_NAME, "REM:%s", ls->name);
^~
lvmlockd-core.c:2657:2: note: ‘snprintf’ output between 5 and 69 bytes into a destination of size 64
snprintf(tmp_name, MAX_NAME, "REM:%s", ls->name);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Replaced with slightly better code - but it still misses error path what
to do if the name would be truncated... - so added FIXME.
Also using all bytes for snprintf() buffer size
(as the size is with \0 included)
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>
Check first if we need to even link -lrt - since clock functions
are normally emebeded with recent glibc (>=2.17)
Use standard RT_LIBS name.
Avoid duplicate test for realtime clock with lvmlockd
Show better error message when realtime clock support is missing or
disabled.
Link RT_LIBS explicitely with lvmlockd and lvmetad.
Avoid adding -g more then once for debug builds.
Avoid enabling DEBUG_MEM when we build multithreaded tools.
Link executables with -fPIE -pie and --export-dynamic LDFLAGS
Introduce PROGS_FLAGS to add option to pass flags for external libs.
Link lvm2 internally library only when really used.
Link DAEMON_LIBS with daemons.
Pass VALGRIND_CFLAGS internally
Set shell failure mode on couple places.
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.
1. dm_uuid is 68 byte length, but buf is 64 which
will cause miss match uuid from lv lock manager
2. no lv lock_type path in dm config, use lock_args instead
Signed-off-by: Zhang Huan <zhanghuan@chinac.com>
If the VG holding the global lock is removed, we can indicate
that as the reason for not being able to acquire the global
lock in subsequent error messages, and can suggest enabling
the global lock in another VG. (This helpful error message
will go away if the global lock is enabled in another VG,
or if lvmlockd is restarted.)
Reconnect to lvmetad if either the send fails (e.g. lvmetad
was restarted since lvmlockd last connected), or if no
lvmetad connection exists (e.g. lvmetad was started after
lvmlockd so no previous connection existed.)
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.
After the lockspace has been successfully removed,
invalidate the name field in the lockspace struct.
The struct remains on the list of lockspaces until
the struct can be freed later. Until the struct is
freed, its name will prevent another new lockspace
from being created with the same name.
Make the lvb validation rules for convert match
those for unlock (even though it would be very
unlikely or impossible for convert to deal with
zero lvb.)
Have commands send lvmlockd the update message
in vg_write instead of vg_commit, so that it's
not done while LVs are suspended. If the vg_write
is not committed, and the seqno sent to lvmlockd
is not used, then lvmlockd can detect this when
the next update uses the same seqno.
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.)
If lvmlockd acquires an lv lock for a command, but the
command exits before the reply, then the command has
not activated the lv and lvmlockd should unlock it.
This only applies when the lv was not already locked.
(There will always be a chance that the lv lock is held
while the lv is not active, i.e. if the command fails in
the small window between getting the lv lock and before
doing the activation. In that case, rerunning the
activation command corrects the inconsistency.)
This commit helps by automatically clearing the
inconsistency (lv locked by not activated) in the most
common case when the lv lock operation is slow to
complete and the command is canceled by the user.
This commit also adds and cleans up references to the
client id in a bunch of log messages, which is useful
to follow processing on each independent lock request.
This applies the same rule/logic to dlm VGs that has always
existed for sanlock VGs. Allowing a dlm VG to be removed
while its lockspace was still running on other hosts largely
worked, but there were difficult problems if another VG with
the same name was recreated. Forcing the VG lockspace to
be stopped, gives both sanlock and dlm VGs the same behavior.
This shortcut was added for an odd case that I do not
believe is relevant any more. Having an alternate
path for lockspace thread cleanup is a complication
that could lead to problems.
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.
When an action is created by lvmlockd for itself,
there is no client to send the result to. Add
the NO_CLIENT flag to the action to skip sending
the result to a client.
