From: Hannes Reinecke <hare@suse.de>
Subject: Disable partitions scan for multipathed devices
References: bnc#402922,bnc#514767
Patch-mainline: not yet
When multipath devices are being used as disks for VM Guests
any partition scanning / setup should be done within the VM Guest,
not from host. So we need to switch off partitions scanning via
kpartx there.
For this I've implemented a new feature 'no_partitions' which
just serves as a notifier to kpartx to _not_ create partitions
on these devices.
Patch ported to SLES11.
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
drivers/md/dm-mpath.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -57,6 +57,8 @@ struct priority_group {
struct list_head pgpaths;
};
+#define FEATURE_NO_PARTITIONS 1
+
/* Multipath context */
struct multipath {
struct list_head list;
@@ -83,6 +85,7 @@ struct multipath {
unsigned pg_init_retries; /* Number of times to retry pg_init */
unsigned pg_init_count; /* Number of times pg_init called */
unsigned pg_init_delay_msecs; /* Number of msecs before pg_init retry */
+ unsigned features; /* Additional selected features */
struct work_struct process_queued_ios;
struct list_head queued_ios;
@@ -852,6 +855,10 @@ static int parse_features(struct arg_set
continue;
}
+ if (!strcasecmp(arg_name, "no_partitions")) {
+ m->features |= FEATURE_NO_PARTITIONS;
+ continue;
+ }
if (!strcasecmp(arg_name, "pg_init_retries") &&
(argc >= 1)) {
r = dm_read_arg(_args + 1, as, &m->pg_init_retries, &ti->error);
@@ -1486,11 +1493,14 @@ static int multipath_status(struct dm_ta
else {
DMEMIT("%u ", m->queue_if_no_path +
(m->pg_init_retries > 0) * 2 +
- (m->pg_init_delay_msecs != DM_PG_INIT_DELAY_DEFAULT) * 2);
+ (m->pg_init_delay_msecs != DM_PG_INIT_DELAY_DEFAULT) * 2 +
+ (m->features & FEATURE_NO_PARTITIONS));
if (m->queue_if_no_path)
DMEMIT("queue_if_no_path ");
if (m->pg_init_retries)
DMEMIT("pg_init_retries %u ", m->pg_init_retries);
+ if (m->features & FEATURE_NO_PARTITIONS)
+ DMEMIT("no_partitions ");
if (m->pg_init_delay_msecs != DM_PG_INIT_DELAY_DEFAULT)
DMEMIT("pg_init_delay_msecs %u ", m->pg_init_delay_msecs);
}