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path: root/drivers/md/dm-table.c
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Diffstat (limited to 'drivers/md/dm-table.c')
-rw-r--r--drivers/md/dm-table.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 81cbbf375bd7..2ec3482e942a 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -55,6 +55,7 @@ struct dm_table {
struct dm_target *targets;
unsigned integrity_supported:1;
+ unsigned singleton:1;
/*
* Indicates the rw permissions for the new logical
@@ -740,6 +741,12 @@ int dm_table_add_target(struct dm_table *t, const char *type,
char **argv;
struct dm_target *tgt;
+ if (t->singleton) {
+ DMERR("%s: target type %s must appear alone in table",
+ dm_device_name(t->md), t->targets->type->name);
+ return -EINVAL;
+ }
+
if ((r = check_space(t)))
return r;
@@ -758,6 +765,15 @@ int dm_table_add_target(struct dm_table *t, const char *type,
return -EINVAL;
}
+ if (dm_target_needs_singleton(tgt->type)) {
+ if (t->num_targets) {
+ DMERR("%s: target type %s must appear alone in table",
+ dm_device_name(t->md), type);
+ return -EINVAL;
+ }
+ t->singleton = 1;
+ }
+
tgt->table = t;
tgt->begin = start;
tgt->len = len;