This function will unmount all filesystem (and those which fail
will be remounted read-only).
Filesystems are being read from /proc/self/mountinfo.
---
src/shutdownd.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 73 insertions(+), 0 deletions(-)
diff --git a/src/shutdownd.c b/src/shutdownd.c
index 72a2801..d47b160 100644
--- a/src/shutdownd.c
+++ b/src/shutdownd.c
@@ -23,6 +23,7 @@
#include <sys/poll.h>
#include <sys/types.h>
#include <sys/timerfd.h>
+#include <sys/mount.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
@@ -36,6 +37,78 @@
#include "sd-daemon.h"
#include "utmp-wtmp.h"
+static int umount_proc_self_mountinfo(void) {
+ FILE *proc_self_mountinfo;
+ int r;
+ char *device, *path, *d, *p;
+
+ if (!(proc_self_mountinfo = fopen("/proc/self/mountinfo", "re")))
+ return -errno;
+
+ for (;;) {
+ int k;
+
+ device = path = d = p = NULL;
+
+ if ((k = fscanf(proc_self_mountinfo,
+ "%*s " /* (1) mount id */
+ "%*s " /* (2) parent id */
+ "%*s " /* (3) major:minor */
+ "%*s " /* (4) root */
+ "%ms " /* (5) mount point */
+ "%*s" /* (6) mount options */
+ "%*[^-]" /* (7) optional fields */
+ "- " /* (8) seperator */
+ "%*s " /* (9) file system type */
+ "%ms" /* (10) mount source */
+ "%*s" /* (11) mount options 2 */
+ "%*[^\n]", /* some rubbish at the end */
+ &path,
+ &device)) != 2) {
+
+ if (k == EOF)
+ break;
+
+ r = -EBADMSG;
+ goto finish;
+ }
+
+ if (!(d = cunescape(device)) ||
+ !(p = cunescape(path))) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if ((r = umount(p) < 0))
+ if ((r = umount2(p, MNT_FORCE)) < 0) {
+ log_warning("umount: forced umount of %s
failed! Trying to remount read-only.\n", p);
+ if ((r = mount(d, p, NULL,
MS_MGC_VAL|MS_REMOUNT|MS_RDONLY, NULL)) < 0)
+ log_error("umount: Cannot remount %s
read-only\n", d);
+ else
+ log_warning("umount: %s busy -
remounted read-only\n", d);
+ } else
+ log_warning("umount: %s was umounted
succesfully\n", p);
+ else
+ log_warning("umount: %s was umounted succesfully\n",
p);
+
+ free(device);
+ free(path);
+ free(d);
+ free(p);
+ }
+
+ r = 0;
+
+finish:
+ free(device);
+ free(path);
+ free(d);
+ free(p);
+ fclose(proc_self_mountinfo);
+
+ return r;
+}
+
static int read_packet(int fd, struct shutdownd_command *_c) {
struct msghdr msghdr;
struct iovec iovec;
--
1.7.2.3
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