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-rw-r--r--include/fuse_common.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/fuse_common.h b/include/fuse_common.h
index e9d8745..dbba05a 100644
--- a/include/fuse_common.h
+++ b/include/fuse_common.h
@@ -409,6 +409,22 @@ struct fuse_loop_config_v1 {
#define FUSE_CAP_EXPLICIT_INVAL_DATA (1 << 25)
/**
+ * Indicates support that dentries can be expired or invalidated.
+ *
+ * Expiring dentries, instead of invalidating them, makes a difference for
+ * overmounted dentries, where plain invalidation would detach all submounts
+ * before dropping the dentry from the cache. If only expiry is set on the
+ * dentry, then any overmounts are left alone and until ->d_revalidate()
+ * is called.
+ *
+ * Note: ->d_revalidate() is not called for the case of following a submount,
+ * so invalidation will only be triggered for the non-overmounted case.
+ * The dentry could also be mounted in a different mount instance, in which case
+ * any submounts will still be detached.
+*/
+#define FUSE_CAP_EXPIRE_ONLY (1 << 26)
+
+/**
* Ioctl flags
*
* FUSE_IOCTL_COMPAT: 32bit compat ioctl on 64bit machine