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Merge pull request #854 from jean-m-cyr/master

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Reduce data manager SD card wear and tear
This commit is contained in:
Lorenz Meier 2014-04-22 09:39:13 +02:00
commit 5481b91ed1
2 changed files with 18 additions and 3 deletions
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19
src/modules/dataman/dataman.c
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@ -44,7 +44,9 @@
#include <stdlib.h>
#include <fcntl.h>
#include <systemlib/systemlib.h>
#include <systemlib/err.h>
#include <queue.h>
#include <string.h>
#include "dataman.h"
@ -594,6 +596,20 @@ task_main(int argc, char *argv[])
sem_init(&g_work_queued_sema, 1, 0);
/* See if the data manage file exists and is a multiple of the sector size */
g_task_fd = open(k_data_manager_device_path, O_RDONLY | O_BINARY);
if (g_task_fd >= 0) {
/* File exists, check its size */
int file_size = lseek(g_task_fd, 0, SEEK_END);
if ((file_size % k_sector_size) != 0) {
warnx("Incompatible data manager file %s, resetting it", k_data_manager_device_path);
close(g_task_fd);
unlink(k_data_manager_device_path);
}
else
close(g_task_fd);
}
/* Open or create the data manager file */
g_task_fd = open(k_data_manager_device_path, O_RDWR | O_CREAT | O_BINARY);
@ -603,7 +619,7 @@ task_main(int argc, char *argv[])
return -1;
}
if (lseek(g_task_fd, max_offset, SEEK_SET) != max_offset) {
if ((unsigned)lseek(g_task_fd, max_offset, SEEK_SET) != max_offset) {
close(g_task_fd);
warnx("Could not seek data manager file %s", k_data_manager_device_path);
sem_post(&g_init_sema); /* Don't want to hang startup */
@ -776,4 +792,3 @@ dataman_main(int argc, char *argv[])
exit(1);
}

2
src/modules/dataman/dataman.h
View File

@ -79,7 +79,7 @@ extern "C" {
} dm_reset_reason;
/* Maximum size in bytes of a single item instance */
#define DM_MAX_DATA_SIZE 126
#define DM_MAX_DATA_SIZE 124
/* Retrieve from the data manager store */
__EXPORT ssize_t