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imsm: retry load_and_parse_mpb if we suspect mdmon has made modifications 

If the checksum verification fails in mdadm and mdmon is running, retry
the load to get a consistent snapshot of the mpb.

Based on db575f3b

Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Artur Paszkiewicz 2014-06-02 15:02:59 +02:00 committed by NeilBrown
parent 40b941b813
commit 8a3544f895
1 changed files with 17 additions and 0 deletions
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17
super-intel.c
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@ -4422,6 +4422,7 @@ static int load_super_imsm(struct supertype *st, int fd, char *devname)
{
struct intel_super *super;
int rv;
int retry;
if (test_partition(fd))
/* IMSM not allowed on partitions */
@ -4444,6 +4445,22 @@ static int load_super_imsm(struct supertype *st, int fd, char *devname)
}
rv = load_and_parse_mpb(fd, super, devname, 0);
/* retry the load if we might have raced against mdmon */
if (rv == 3) {
struct mdstat_ent *mdstat = mdstat_by_component(fd2devnm(fd));
if (mdstat && mdmon_running(mdstat->devnm) && getpid() != mdmon_pid(mdstat->devnm)) {
for (retry = 0; retry < 3; retry++) {
usleep(3000);
rv = load_and_parse_mpb(fd, super, devname, 0);
if (rv != 3)
break;
}
}
free_mdstat(mdstat);
}
if (rv) {
if (devname)
pr_err("Failed to load all information "