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-rw-r--r--fs/fscache/internal.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index c27e2db3004e..5f905a499306 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -342,6 +342,27 @@ void fscache_put_context(struct fscache_cookie *cookie, void *context)
cookie->def->put_context(cookie->netfs_data, context);
}
+/*
+ * Update the auxiliary data on a cookie.
+ */
+static inline
+void fscache_update_aux(struct fscache_cookie *cookie, const void *aux_data)
+{
+ void *p;
+
+ if (!aux_data)
+ return;
+ if (cookie->aux_len <= sizeof(cookie->inline_aux))
+ p = cookie->inline_aux;
+ else
+ p = cookie->aux;
+
+ if (memcmp(p, aux_data, cookie->aux_len) != 0) {
+ memcpy(p, aux_data, cookie->aux_len);
+ set_bit(FSCACHE_COOKIE_AUX_UPDATED, &cookie->flags);
+ }
+}
+
/*****************************************************************************/
/*
* debug tracing