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1079
by William Grant
Merge setup-refactor branch. This completely breaks existing installations; |
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/* IVLE - Informatics Virtual Learning Environment
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* Copyright (C) 2008 The University of Melbourne
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Program: Timount
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* Author: William Grant
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* Date: 05/07/2008
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*
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* Timount ('timeout mounts') cleans up mounts after a period of inactivity.
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* It looks in the given directory of mountpoints, and attempts to unmount each
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* with the MNT_EXPIRE flag. This flag is reset whenever a process accesses
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* the mountpoint, meaning that a mountpoint will be unmounted only if it is
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* inactive for the interval between two timount invocations.
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*
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* It is unclear how frequently timount should optimally be run. Empirical data
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* specific to the installation will likely be required.
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*
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* Usage: timount <path>
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* Must run as root, and probably from cron.
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*/
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <errno.h> |
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#include <dirent.h> |
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#include <syslog.h> |
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#include <sys/mount.h> |
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#ifndef MNT_EXPIRE
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/* For some reason this isn't defined in libc at the moment. */
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#define MNT_EXPIRE 4
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#endif
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void usage(const char *prog) |
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{
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fprintf(stderr, "usage: %s <path>\n", prog); |
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exit(1); |
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}
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int main(int argc, const char *argv[]) |
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{
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DIR *rootdir; |
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struct dirent *mp; |
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char *dirname; |
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if (argc != 2) |
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usage(argv[0]); |
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openlog("timount", LOG_CONS | LOG_PID, LOG_USER); |
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if (!(rootdir = opendir(argv[1]))) |
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{
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perror("could not open specified path"); |
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exit(1); |
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}
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while ((mp = readdir(rootdir))) |
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{
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dirname = malloc(strlen(argv[1]) + strlen(mp->d_name) + 2); |
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sprintf(dirname, "%s/%s", argv[1], mp->d_name); |
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if (mp->d_name[0] != '.' && mp->d_name[0] != '_') |
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{
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if (umount2(dirname, MNT_EXPIRE)) |
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{
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/* We failed to unmount, but did it set the expire flag? */
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if (errno == EAGAIN) |
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syslog(LOG_INFO, "marked %s for expiry\n", mp->d_name); |
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}
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else
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{
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syslog(LOG_INFO, "unmounted %s\n", mp->d_name); |
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}
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}
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free(dirname); |
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}
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closedir(rootdir); |
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closelog(); |
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return 0; |
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}
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