From: Valerie Aurora <vaurora@xxxxxxxxxx>
d_free_unions() frees the union stack associated with a directory.
---
fs/union.c | 24 ++++++++++++++++++++++++
fs/union.h | 7 +++++++
2 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/fs/union.c b/fs/union.c
index c8d7766..77d6a74 100644
--- a/fs/union.c
+++ b/fs/union.c
@@ -19,6 +19,7 @@
#include <linux/mount.h>
#include <linux/fs_struct.h>
#include <linux/slab.h>
+#include <linux/namei.h>
#include "union.h"
@@ -36,3 +37,26 @@ static struct union_stack *union_alloc(struct path *topmost)
return kcalloc(sizeof(struct path), layers, GFP_KERNEL);
}
+
+/**
+ * d_free_unions - free all unions for this dentry
+ * @dentry: topmost dentry in the union stack to remove
+ *
+ * This must be called when freeing a dentry.
+ */
+void d_free_unions(struct dentry *topmost)
+{
+ struct path *path;
+ unsigned int i, layers = topmost->d_sb->s_union_count;
+
+ if (!IS_DIR_UNIONED(topmost))
+ return;
+
+ for (i = 0; i < layers; i++) {
+ path = union_find_dir(topmost, i);
+ if (path->mnt)
+ path_put(path);
+ }
+ kfree(topmost->d_union_stack);
+ topmost->d_union_stack = NULL;
+}
diff --git a/fs/union.h b/fs/union.h
index bd9c2b0..5b79131 100644
--- a/fs/union.h
+++ b/fs/union.h
@@ -49,6 +49,10 @@ struct union_stack {
struct path u_dirs[0];
};
+#define IS_DIR_UNIONED(dentry) ((dentry)->d_union_stack)
+
+extern void d_free_unions(struct dentry *);
+
static inline
struct path *union_find_dir(struct dentry *dentry, unsigned int layer)
{
@@ -58,6 +62,9 @@ struct path *union_find_dir(struct dentry *dentry, unsigned int layer)
#else /* CONFIG_UNION_MOUNT */
+#define IS_DIR_UNIONED(x) (0)
+
+#define d_free_unions(x) do { } while (0)
#define union_find_dir(x, y) ({ BUG(); (NULL); })
#endif /* CONFIG_UNION_MOUNT */
--
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