This allows finding the parent container of a subarray for external
metadata arrays.
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@xxxxxxxxx>
---
drivers/md/md.c | 37 +++++++++++++++++++++++++++++++++++++
drivers/md/md.h | 3 +++
2 files changed, 40 insertions(+)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 7028d54..5a14f8e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -595,6 +595,43 @@ static struct mddev *mddev_find(dev_t unit)
goto retry;
}
+struct mddev *mddev_find_container(struct mddev *subarray)
+{
+ struct mddev *mddev, *ret = NULL;
+ char *container_name;
+ int len = 0;
+ int i;
+
+ if (!subarray->external)
+ return NULL;
+
+ container_name = subarray->metadata_type + 1;
+ i = 0;
+ while (container_name[i]) {
+ if (container_name[i] == '/') {
+ len = i;
+ break;
+ }
+ i++;
+ }
+ if (len == 0)
+ return NULL;
+
+ spin_lock(&all_mddevs_lock);
+ list_for_each_entry(mddev, &all_mddevs, all_mddevs) {
+ char *name = mdname(mddev);
+ if (strlen(name) == len &&
+ strncmp(name, container_name, len) == 0) {
+ ret = mddev;
+ break;
+ }
+ }
+ spin_unlock(&all_mddevs_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mddev_find_container);
+
static struct attribute_group md_redundancy_group;
void mddev_unlock(struct mddev *mddev)
diff --git a/drivers/md/md.h b/drivers/md/md.h
index d1e56f8..ca0b68f 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -711,4 +711,7 @@ static inline int mddev_is_clustered(struct mddev *mddev)
{
return mddev->cluster_info && mddev->bitmap_info.nodes > 1;
}
+
+extern struct mddev *mddev_find_container(struct mddev *subarray);
+
#endif /* _MD_MD_H */
--
2.10.1
--
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