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-rw-r--r--mm/zpool.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/mm/zpool.c b/mm/zpool.c
index 68d2dd8ed2d8..8f670d3e8706 100644
--- a/mm/zpool.c
+++ b/mm/zpool.c
@@ -100,6 +100,39 @@ static void zpool_put_driver(struct zpool_driver *driver)
}
/**
+ * zpool_has_pool() - Check if the pool driver is available
+ * @type The type of the zpool to check (e.g. zbud, zsmalloc)
+ *
+ * This checks if the @type pool driver is available. This will try to load
+ * the requested module, if needed, but there is no guarantee the module will
+ * still be loaded and available immediately after calling. If this returns
+ * true, the caller should assume the pool is available, but must be prepared
+ * to handle the @zpool_create_pool() returning failure. However if this
+ * returns false, the caller should assume the requested pool type is not
+ * available; either the requested pool type module does not exist, or could
+ * not be loaded, and calling @zpool_create_pool() with the pool type will
+ * fail.
+ *
+ * Returns: true if @type pool is available, false if not
+ */
+bool zpool_has_pool(char *type)
+{
+ struct zpool_driver *driver = zpool_get_driver(type);
+
+ if (!driver) {
+ request_module("zpool-%s", type);
+ driver = zpool_get_driver(type);
+ }
+
+ if (!driver)
+ return false;
+
+ zpool_put_driver(driver);
+ return true;
+}
+EXPORT_SYMBOL(zpool_has_pool);
+
+/**
* zpool_create_pool() - Create a new zpool
* @type The type of the zpool to create (e.g. zbud, zsmalloc)
* @name The name of the zpool (e.g. zram0, zswap)