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mdmon: support scanning for containers 

When the given container is '/proc/mdstat' then launch an mdmon instance
per container found in /proc/mdstat.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2009-01-20 01:36:50 -07:00 committed by root
parent 6f4098a6fd
commit 1ffd2840df
1 changed files with 49 additions and 22 deletions
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71
mdmon.c
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@ -275,20 +275,16 @@ void usage(void)
exit(2);
}
int mdmon(char *devname, int devnum, int scan, char *switchroot);
int main(int argc, char *argv[])
{
int mdfd;
struct mdinfo *mdi, *di;
struct supertype *container;
sigset_t set;
struct sigaction act;
int pfd[2];
int status;
int ignore;
char *container_name = NULL;
char *switchroot = NULL;
int devnum;
char *devname;
int scan = 0;
int status = 0;
switch (argc) {
case 2:
@ -306,7 +302,24 @@ int main(int argc, char *argv[])
usage();
}
if (strncmp(container_name, "md", 2) == 0) {
if (strcmp(container_name, "/proc/mdstat") == 0) {
struct mdstat_ent *mdstat, *e;
/* launch an mdmon instance for each container found */
scan = 1;
mdstat = mdstat_read(0, 0);
for (e = mdstat; e; e = e->next) {
if (strncmp(e->metadata_version, "external:", 9) == 0 &&
!is_subarray(&e->metadata_version[9])) {
devname = devnum2devname(e->devnum);
status |= mdmon(devname, e->devnum, scan,
switchroot);
}
}
free_mdstat(mdstat);
return status;
} else if (strncmp(container_name, "md", 2) == 0) {
devnum = devname2devnum(container_name);
devname = devnum2devname(devnum);
if (strcmp(container_name, devname) != 0)
@ -328,29 +341,43 @@ int main(int argc, char *argv[])
container_name);
exit(1);
}
return mdmon(devname, devnum, scan, switchroot);
}
int mdmon(char *devname, int devnum, int scan, char *switchroot)
{
int mdfd;
struct mdinfo *mdi, *di;
struct supertype *container;
sigset_t set;
struct sigaction act;
int pfd[2];
int status;
int ignore;
mdfd = open_dev(devnum);
if (mdfd < 0) {
fprintf(stderr, "mdmon: %s: %s\n", container_name,
fprintf(stderr, "mdmon: %s: %s\n", devname,
strerror(errno));
exit(1);
return 1;
}
if (md_get_version(mdfd) < 0) {
fprintf(stderr, "mdmon: %s: Not an md device\n",
container_name);
exit(1);
devname);
return 1;
}
/* Fork, and have the child tell us when they are ready */
if (do_fork()) {
if (do_fork() || scan) {
if (pipe(pfd) != 0) {
fprintf(stderr, "mdmon: failed to create pipe\n");
exit(1);
return 1;
}
switch(fork()) {
case -1:
fprintf(stderr, "mdmon: failed to fork: %s\n",
strerror(errno));
exit(1);
return 1;
case 0: /* child */
close(pfd[0]);
break;
@ -360,7 +387,7 @@ int main(int argc, char *argv[])
wait(&status);
status = WEXITSTATUS(status);
}
exit(status);
return status;
}
} else
pfd[0] = pfd[1] = -1;
@ -386,20 +413,20 @@ int main(int argc, char *argv[])
}
if (mdi->array.level != UnSet) {
fprintf(stderr, "mdmon: %s is not a container - cannot monitor\n",
container_name);
devname);
exit(3);
}
if (mdi->array.major_version != -1 ||
mdi->array.minor_version != -2) {
fprintf(stderr, "mdmon: %s does not use external metadata - cannot monitor\n",
container_name);
devname);
exit(3);
}
container->ss = find_metadata_methods(mdi->text_version);
if (container->ss == NULL) {
fprintf(stderr, "mdmon: %s uses unknown metadata: %s\n",
container_name, mdi->text_version);
devname, mdi->text_version);
exit(3);
}
@ -481,9 +508,9 @@ int main(int argc, char *argv[])
}
container->sock = make_control_sock(container->devname);
if (container->ss->load_super(container, mdfd, container_name)) {
if (container->ss->load_super(container, mdfd, devname)) {
fprintf(stderr, "mdmon: Cannot load metadata for %s\n",
container_name);
devname);
exit(3);
}
close(mdfd);