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dmeventd_thin: add wait_pid

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Add support handling command exit.
This commit is contained in:
Zdenek Kabelac 2017-01-20 21:42:55 +01:00
parent 2e935c0967
commit 14746a6c00
1 changed files with 55 additions and 0 deletions
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55
daemons/dmeventd/plugins/thin/dmeventd_thin.c
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@ -363,6 +363,35 @@ static int _use_policy(struct dm_task *dmt, struct dso_state *state)
return 1;
}
/* Check if executed command has finished
* Only 1 command may run */
static int _wait_for_pid(struct dso_state *state)
{
int status = 0;
if (state->pid == -1)
return 1;
if (!waitpid(state->pid, &status, WNOHANG))
return 0;
/* Wait for finish */
if (WIFEXITED(status)) {
log_verbose("Child %d exited with status %d.",
state->pid, WEXITSTATUS(status));
state->fails = WEXITSTATUS(status) ? 1 : 0;
} else {
if (WIFSIGNALED(status))
log_verbose("Child %d was terminated with status %d.",
state->pid, WTERMSIG(status));
state->fails = 1;
}
state->pid = -1;
return 1;
}
void process_event(struct dm_task *dmt,
enum dm_event_mask event __attribute__((unused)),
void **user)
@ -383,6 +412,11 @@ void process_event(struct dm_task *dmt,
dm_percent_to_float(state->data_percent_check),
dm_percent_to_float(state->metadata_percent_check));
#endif
if (!_wait_for_pid(state)) {
log_warn("WARNING: Skipping event, child %d is still running (%s).",
state->pid, state->cmd_str);
return;
}
if (event & DM_EVENT_DEVICE_ERROR) {
/* Error -> no need to check and do instant resize */
@ -529,6 +563,7 @@ int register_device(const char *device,
state->metadata_percent_check = CHECK_MINIMUM;
state->data_percent_check = CHECK_MINIMUM;
state->pid = -1;
*user = state;
log_info("Monitoring thin pool %s.", device);
@ -547,6 +582,26 @@ int unregister_device(const char *device,
void **user)
{
struct dso_state *state = *user;
int i;
for (i = 0; !_wait_for_pid(state) && (i < 6); ++i) {
if (i == 0)
/* Give it 2 seconds, then try to terminate & kill it */
log_verbose("Child %d still not finished (%s) waiting.",
state->pid, state->cmd_str);
else if (i == 3) {
log_warn("WARNING: Terminating child %d.", state->pid);
kill(state->pid, SIGINT);
kill(state->pid, SIGTERM);
} else if (i == 5) {
log_warn("WARNING: Killing child %d.", state->pid);
kill(state->pid, SIGKILL);
}
sleep(1);
}
if (state->pid != -1)
log_warn("WARNING: Cannot kill child %d!", state->pid);
dmeventd_lvm2_exit_with_pool(state);
log_info("No longer monitoring thin pool %s.", device);