Allow inode cache invalidation in high-level API

We re-introduce the functionality of invalidating the caches for an
inode specified by path by adding a new routine
fuse_invalidate_path. This is useful for network-based file systems
which use the high-level API, enabling them to notify the kernel about
external changes.

This is a revival of Miklos Szeredi's original code for the
fuse_invalidate routine.

1 files changed, 13 insertions, 0 deletions

diff --git a/include/fuse.h b/include/fuse.h
index 5eb257c..4898029 100644
--- a/include/fuse.h
+++ b/include/fuse.h
@@ -1010,6 +1010,19 @@ int fuse_getgroups(int size, gid_t list[]);
 int fuse_interrupted(void);
 
 /**
+ * Invalidates cache for the given path.
+ *
+ * This calls fuse_lowlevel_notify_inval_inode internally.
+ *
+ * @return 0 on successful invalidation, negative error value otherwise.
+ *         This routine may return -ENOENT to indicate that there was
+ *         no entry to be invalidated, e.g., because the path has not
+ *         been seen before or has been forgotten; this should not be
+ *         considered to be an error.
+ */
+int fuse_invalidate_path(struct fuse *f, const char *path);
+
+/**
  * The real main function
  *
  * Do not call this directly, use fuse_main()