smb: client: properly invalidate and reuse cached direntsplk

By properly invalidating cache dir entries allows to determine when
we must or not do a remote open of the dir, reducing the number of
network calls while the cached dir is still valid.

Signed-off-by: Enzo Matsumiya <ematsumiya@suse.de>

1 files changed, 22 insertions, 0 deletions

diff --git a/fs/smb/client/cached_dir.c b/fs/smb/client/cached_dir.c
index d28855a1edc1..0ee6eb959f1b 100644
--- a/fs/smb/client/cached_dir.c
+++ b/fs/smb/client/cached_dir.c
@@ -134,6 +134,28 @@ struct cached_fid *lookup_cached_dir(struct cached_fids *cfids, const void *key,
 	return cfid;
 }
 
+void invalidate_dirents(struct cached_fid *cfid)
+{
+	struct cached_dirents *cde;
+	struct cached_dirent *de, *q;
+
+	if (!cfid)
+		return;
+
+	cde = &cfid->dirents;
+	mutex_lock(&cde->de_mutex);
+	list_for_each_entry_safe(de, q, &cde->entries, entry) {
+		list_del(&de->entry);
+		kfree(de->name);
+		kfree(de);
+	}
+
+	cde->is_valid = false;
+	cde->is_failed = false;
+	cde->pos = 2;
+	mutex_unlock(&cde->de_mutex);
+}
+
 /*
  * Open the and cache a directory handle.
  * If error then *cfid is not initialized.