68 lines
2.1 KiB
Plaintext
68 lines
2.1 KiB
Plaintext
From: Hannes Reinecke <hare@suse.de>
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Subject: Disable partitions scan for multipathed devices
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References: bnc#402922,bnc#514767
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Patch-mainline: not yet
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When multipath devices are being used as disks for VM Guests
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any partition scanning / setup should be done within the VM Guest,
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not from host. So we need to switch off partitions scanning via
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kpartx there.
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For this I've implemented a new feature 'no_partitions' which
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just serves as a notifier to kpartx to _not_ create partitions
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on these devices.
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Patch ported to SLES11.
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Signed-off-by: Hannes Reinecke <hare@suse.de>
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---
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drivers/md/dm-mpath.c | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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--- a/drivers/md/dm-mpath.c
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+++ b/drivers/md/dm-mpath.c
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@@ -57,6 +57,8 @@ struct priority_group {
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struct list_head pgpaths;
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};
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+#define FEATURE_NO_PARTITIONS 1
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+
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/* Multipath context */
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struct multipath {
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struct list_head list;
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@@ -83,6 +85,7 @@ struct multipath {
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unsigned saved_queue_if_no_path;/* Saved state during suspension */
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unsigned pg_init_retries; /* Number of times to retry pg_init */
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unsigned pg_init_count; /* Number of times pg_init called */
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+ unsigned features; /* Additional selected features */
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struct work_struct process_queued_ios;
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struct list_head queued_ios;
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@@ -851,6 +854,10 @@ static int parse_features(struct arg_set
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continue;
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}
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+ if (!strnicmp(param_name, MESG_STR("no_partitions"))) {
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+ m->features |= FEATURE_NO_PARTITIONS;
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+ continue;
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+ }
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if (!strnicmp(param_name, MESG_STR("pg_init_retries")) &&
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(argc >= 1)) {
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r = read_param(_params + 1, shift(as),
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@@ -1475,11 +1482,14 @@ static int multipath_status(struct dm_ta
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DMEMIT("2 %u %u ", m->queue_size, m->pg_init_count);
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else {
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DMEMIT("%u ", m->queue_if_no_path +
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- (m->pg_init_retries > 0) * 2);
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+ (m->pg_init_retries > 0) * 2 +
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+ (m->features & FEATURE_NO_PARTITIONS));
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if (m->queue_if_no_path)
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DMEMIT("queue_if_no_path ");
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if (m->pg_init_retries)
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DMEMIT("pg_init_retries %u ", m->pg_init_retries);
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+ if (m->features & FEATURE_NO_PARTITIONS)
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+ DMEMIT("no_partitions ");
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}
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if (!m->hw_handler_name || type == STATUSTYPE_INFO)
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