Dan Williams: mdmon: exec(2) when the switchroot argument is not "/"
Martin F. Krafft
madduck at alioth.debian.org
Tue Oct 27 19:21:55 UTC 2009
Module: mdadm
Branch: upstream
Commit: b928b5a0384e7181425a282a0586cbbb3c85fbc3
URL: http://git.debian.org/?p=pkg-mdadm/mdadm.git;a=commit;h=b928b5a0384e7181425a282a0586cbbb3c85fbc3
Author: Dan Williams <dan.j.williams at intel.com>
Date: Tue Oct 13 17:08:33 2009 -0700
mdmon: exec(2) when the switchroot argument is not "/"
Try to execute mdmon from the target namespace. When used for initramfs
handovers we need to drop all references to the initramfs filesystem for
that memory to be freed.
Cc: Hans de Goede <hdegoede at redhat.com>
Signed-off-by: Dan Williams <dan.j.williams at intel.com>
---
mdmon.c | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/mdmon.c b/mdmon.c
index 5f87e78..d3e8be5 100644
--- a/mdmon.c
+++ b/mdmon.c
@@ -369,6 +369,29 @@ int mdmon(char *devname, int devnum, int scan, char *switchroot)
dprintf("starting mdmon for %s in %s\n",
devname, switchroot ? : "/");
+
+ /* try to spawn mdmon instances from the target file system */
+ if (switchroot && strcmp(switchroot, "/") != 0) {
+ char path[1024];
+ pid_t pid;
+
+ sprintf(path, "%s/sbin/mdmon", switchroot);
+ switch (fork()) {
+ case 0:
+ execl(path, "mdmon", devname, NULL);
+ exit(1);
+ case -1:
+ return 1;
+ default:
+ pid = wait(&status);
+ if (pid > -1 && WIFEXITED(status) &&
+ WEXITSTATUS(status) == 0)
+ return 0;
+ else
+ return 1;
+ }
+ }
+
mdfd = open_dev(devnum);
if (mdfd < 0) {
fprintf(stderr, "mdmon: %s: %s\n", devname,
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