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thin: dmeventd plugin check number of failures

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If plugin's lvm command execution fails too often (>10 times),
there is no point to torture system more then necessary, just log
and drop monitoring in this case.
This commit is contained in:
Zdenek Kabelac 2015-10-29 11:52:11 +01:00
parent b3c81d02c9
commit 099466939e
2 changed files with 17 additions and 3 deletions
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1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.02.110 -
======================================
Disable thin monitoring plugin when it fails too often (>10 times).
Fix/restore parsing of empty field '-' when processing dmeventd event.
Enhance dm_tree_node_size_changed() to recognize size reduction.
Support exit on idle for dmenventd (1 hour).

17
daemons/dmeventd/plugins/thin/dmeventd_thin.c
View File

@ -18,6 +18,7 @@
#include <sys/wait.h>
#include <stdarg.h>
#include <pthread.h>
/* TODO - move this mountinfo code into library to be reusable */
#ifdef __linux__
@ -36,6 +37,8 @@
#define UMOUNT_COMMAND "/bin/umount"
#define MAX_FAILS (10)
#define THIN_DEBUG 0
struct dso_state {
@ -44,6 +47,7 @@ struct dso_state {
int data_percent_check;
uint64_t known_metadata_size;
uint64_t known_data_size;
unsigned fails;
char cmd_str[1024];
};
@ -245,7 +249,9 @@ static void _use_policy(struct dm_task *dmt, struct dso_state *state)
log_error("Failed to extend thin pool %s.",
dm_task_get_name(dmt));
_umount(dmt);
}
state->fails++;
} else
state->fails = 0;
}
void process_event(struct dm_task *dmt,
@ -270,7 +276,7 @@ void process_event(struct dm_task *dmt,
if (event & DM_EVENT_DEVICE_ERROR) {
/* Error -> no need to check and do instant resize */
_use_policy(dmt, state);
return;
goto out;
}
dm_get_next_target(dmt, next, &start, &length, &target_type, &params);
@ -338,6 +344,13 @@ void process_event(struct dm_task *dmt,
out:
if (tps)
dm_pool_free(state->mem, tps);
if (state->fails >= MAX_FAILS) {
log_warn("WARNING: Dropping monitoring of %s. "
"lvm2 command fails too often (%u times in raw).",
device, state->fails);
pthread_kill(pthread_self(), SIGALRM);
}
}
int register_device(const char *device,