fuse: add support to FUSE_NOTIFY_INC_EPOCH

This patch adds support for the FUSE INC_EPOCH notify.  This new operation
simply increments the FUSE connection epoch value, allowing to invalidate
all the dentries next time they are revalidated.

Signed-off-by: Luis Henriques <luis@igalia.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/fuse_lowlevel.h b/include/fuse_lowlevel.h
index 138a784..82f4a8d 100644
--- a/include/fuse_lowlevel.h
+++ b/include/fuse_lowlevel.h
@@ -1745,6 +1745,20 @@ int fuse_lowlevel_notify_inval_inode(struct fuse_session *se, fuse_ino_t ino,
 				     off_t off, off_t len);
 
 /**
+ * Notify to increment the epoch for the current
+ *
+ * Each fuse connection has an 'epoch', which is initialized during INIT.
+ * Caching will then be validated against the epoch value: if the current epoch
+ * is higher than an object being revalidated, the object is invalid.
+ *
+ * This function simply increment the current epoch value.
+ *
+ * @param se the session object
+ * @return zero for success, -errno for failure
+ */
+int fuse_lowlevel_notify_increment_epoch(struct fuse_session *se);
+
+/**
  * Notify to invalidate parent attributes and the dentry matching parent/name
  *
  * To avoid a deadlock this function must not be called in the