From b928b5a0384e7181425a282a0586cbbb3c85fbc3 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 13 Oct 2009 17:08:33 -0700 Subject: [PATCH] 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 Signed-off-by: Dan Williams --- mdmon.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) 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,