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-rw-r--r--fs/overlayfs/util.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 9dc1c0af586b..1953986ee6bc 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -12,6 +12,7 @@
#include <linux/slab.h>
#include <linux/cred.h>
#include <linux/xattr.h>
+#include <linux/sched/signal.h>
#include "overlayfs.h"
#include "ovl_entry.h"
@@ -264,3 +265,33 @@ struct file *ovl_path_open(struct path *path, int flags)
{
return dentry_open(path, flags | O_NOATIME, current_cred());
}
+
+int ovl_copy_up_start(struct dentry *dentry)
+{
+ struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+ struct ovl_entry *oe = dentry->d_fsdata;
+ int err;
+
+ spin_lock(&ofs->copyup_wq.lock);
+ err = wait_event_interruptible_locked(ofs->copyup_wq, !oe->copying);
+ if (!err) {
+ if (oe->__upperdentry)
+ err = 1; /* Already copied up */
+ else
+ oe->copying = true;
+ }
+ spin_unlock(&ofs->copyup_wq.lock);
+
+ return err;
+}
+
+void ovl_copy_up_end(struct dentry *dentry)
+{
+ struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+ struct ovl_entry *oe = dentry->d_fsdata;
+
+ spin_lock(&ofs->copyup_wq.lock);
+ oe->copying = false;
+ wake_up_locked(&ofs->copyup_wq);
+ spin_unlock(&ofs->copyup_wq.lock);
+}