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/* IVLE - Informatics Virtual Learning Environment
* Copyright (C) 2008 The University of Melbourne
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Program: Timount
* Author: William Grant
* Date: 05/07/2008
*
* Timount ('timeout mounts') cleans up mounts after a period of inactivity.
* It looks in the given directory of mountpoints, and attempts to unmount each
* with the MNT_EXPIRE flag. This flag is reset whenever a process accesses
* the mountpoint, meaning that a mountpoint will be unmounted only if it is
* inactive for the interval between two timount invocations.
*
* It is unclear how frequently timount should optimally be run. Empirical data
* specific to the installation will likely be required.
*
* Usage: timount <path>
* Must run as root, and probably from cron.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include <syslog.h>
#include <sys/mount.h>
#ifndef MNT_EXPIRE
/* For some reason this isn't defined in libc at the moment. */
#define MNT_EXPIRE 4
#endif
void usage(const char *prog)
{
fprintf(stderr, "usage: %s <path>\n", prog);
exit(1);
}
int main(int argc, const char *argv[])
{
DIR *rootdir;
struct dirent *mp;
char *dirname;
if (argc != 2)
usage(argv[0]);
openlog("timount", LOG_CONS | LOG_PID, LOG_USER);
if (!(rootdir = opendir(argv[1])))
{
perror("could not open specified path");
exit(1);
}
while ((mp = readdir(rootdir)))
{
dirname = malloc(strlen(argv[1]) + strlen(mp->d_name) + 2);
sprintf(dirname, "%s/%s", argv[1], mp->d_name);
if (mp->d_name[0] != '.' && mp->d_name[0] != '_')
{
if (umount2(dirname, MNT_EXPIRE))
{
/* We failed to unmount, but did it set the expire flag? */
if (errno == EAGAIN)
syslog(LOG_INFO, "marked %s for expiry\n", mp->d_name);
}
else
{
syslog(LOG_INFO, "unmounted %s\n", mp->d_name);
}
}
free(dirname);
}
closedir(rootdir);
closelog();
return 0;
}
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