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dmeventd_thin: add run_command

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Implement forking of executable command.
When command is forked, dmeventd may continue monitor device.
This commit is contained in:
Zdenek Kabelac 2017-01-20 21:41:23 +01:00
parent e5bef50827
commit 2e935c0967
1 changed files with 49 additions and 4 deletions
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53
daemons/dmeventd/plugins/thin/dmeventd_thin.c
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@ -1,5 +1,5 @@
/*
* Copyright (C) 2011-2016 Red Hat, Inc. All rights reserved.
* Copyright (C) 2011-2017 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
@ -55,6 +55,8 @@ struct dso_state {
uint64_t known_metadata_size;
uint64_t known_data_size;
unsigned fails;
pid_t pid;
char **argv;
char cmd_str[1024];
};
@ -302,19 +304,62 @@ out:
dm_bitset_destroy(data.minors);
}
static int _run_command(struct dso_state *state)
{
char val[2][36];
char *env[] = { val[0], val[1], NULL };
int i;
if (state->data_percent) {
/* Prepare some known data to env vars for easy use */
(void) dm_snprintf(val[0], sizeof(val[0]), "DMEVENTD_THIN_POOL_DATA=%d",
state->data_percent / DM_PERCENT_1);
(void) dm_snprintf(val[1], sizeof(val[1]), "DMEVENTD_THIN_POOL_METADATA=%d",
state->metadata_percent / DM_PERCENT_1);
} else {
/* For an error event it's for a user to check status and decide */
env[0] = NULL;
log_debug("Error event processing");
}
log_verbose("Executing command: %s", state->cmd_str);
/* TODO:
* Support parallel run of 'task' and it's waitpid maintainence
* ATM we can't handle signaling of SIGALRM
* as signalling is not allowed while 'process_event()' is running
*/
if (!(state->pid = fork())) {
/* child */
(void) close(0);
for (i = 3; i < 255; ++i) (void) close(i);
execve(state->argv[0], state->argv, env);
_exit(errno);
} else if (state->pid == -1) {
log_error("Can't fork command %s.", state->cmd_str);
state->fails = 1;
return 0;
}
return 1;
}
static int _use_policy(struct dm_task *dmt, struct dso_state *state)
{
#if THIN_DEBUG
log_debug("dmeventd executes: %s.", state->cmd_str);
#endif
if (state->argv)
return _run_command(state);
if (!dmeventd_lvm2_run_with_lock(state->cmd_str)) {
log_error("Failed to extend thin pool %s.",
dm_task_get_name(dmt));
state->fails++;
log_error("Failed command for %s.", dm_task_get_name(dmt));
state->fails = 1;
return 0;
}
state->fails = 0;
return 1;
}