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lvmlockd: check for multiple lock managers running

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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.
This commit is contained in:
David Teigland 2024-04-19 10:48:19 -05:00
parent f4911177da
commit 85b711caae
1 changed files with 20 additions and 6 deletions
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26
daemons/lvmlockd/lvmlockd-core.c
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@ -4154,12 +4154,26 @@ static int add_lock_action(struct action *act)
vg_ls_name(act->vg_name, ls_name);
} else {
if (!gl_use_dlm && !gl_use_sanlock && !gl_use_idm) {
if (lm_is_running_dlm())
gl_use_dlm = 1;
else if (lm_is_running_sanlock())
gl_use_sanlock = 1;
else if (lm_is_running_idm())
gl_use_idm = 1;
int run_sanlock = lm_is_running_sanlock();
int run_dlm = lm_is_running_dlm();
int run_idm = lm_is_running_idm();
if (run_sanlock + run_dlm + run_idm >= 2) {
log_error("global lock op %s mode %s: multiple lock managers running sanlock=%d dlm=%d idm=%d",
op_str(act->op), mode_str(act->mode), run_sanlock, run_dlm, run_idm);
} else if (!run_sanlock && !run_dlm && !run_idm) {
log_debug("global lock op %s mode %s: no lock manager running",
op_str(act->op), mode_str(act->mode));
} else {
if (run_dlm)
gl_use_dlm = 1;
else if (run_sanlock)
gl_use_sanlock = 1;
else if (run_idm)
gl_use_idm = 1;
log_debug("global lock op %s mode %s: gl_use_sanlock %d gl_use_dlm %d gl_use_idm %d",
op_str(act->op), mode_str(act->mode), gl_use_sanlock, gl_use_dlm, gl_use_idm);
}
}
gl_ls_name(ls_name);
}