From 22cc0c761ad23395a8220ce1954cfb8a64f36ff4 Mon Sep 17 00:00:00 2001
From: HereThereBeDragons <HereThereBeDragons@users.noreply.github.com>
Date: Thu, 27 Oct 2022 17:52:10 +0200
Subject: [PATCH] Initial patch provided by Miklos Szeredi
 <mszeredi@redhat.com>

---
 include/fuse_kernel.h   |  8 +++++++-
 include/fuse_lowlevel.h |  8 ++++++++
 lib/fuse_lowlevel.c     | 18 ++++++++++++++----
 lib/fuse_versionscript  |  1 +
 4 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/include/fuse_kernel.h b/include/fuse_kernel.h
index 09da620b5..e0666a1f7 100644
--- a/include/fuse_kernel.h
+++ b/include/fuse_kernel.h
@@ -336,6 +336,12 @@
  */
 #define FUSE_POLL_SCHEDULE_NOTIFY (1 << 0)
 
+/**
+ * notify_inval_entry flags
+ * FUSE_EXPIRE_ONLY
+ */
+#define FUSE_EXPIRE_ONLY		(1 << 0)
+
 enum fuse_opcode {
 	FUSE_LOOKUP	   = 1,
 	FUSE_FORGET	   = 2,  /* no reply */
@@ -800,7 +806,7 @@ struct fuse_notify_inval_inode_out {
 struct fuse_notify_inval_entry_out {
 	uint64_t	parent;
 	uint32_t	namelen;
-	uint32_t	padding;
+	uint32_t	flags;
 };
 
 struct fuse_notify_delete_out {
diff --git a/include/fuse_lowlevel.h b/include/fuse_lowlevel.h
index 53f0fcf4b..c955cc4bb 100644
--- a/include/fuse_lowlevel.h
+++ b/include/fuse_lowlevel.h
@@ -1675,6 +1675,14 @@ int fuse_lowlevel_notify_inval_inode(struct fuse_session *se, fuse_ino_t ino,
 int fuse_lowlevel_notify_inval_entry(struct fuse_session *se, fuse_ino_t parent,
 				     const char *name, size_t namelen);
 
+enum fuse_expire_flags {
+	FUSE_LL_EXPIRE_ONLY	= (1 << 0),
+};
+
+int fuse_lowlevel_notify_expire_entry(struct fuse_session *se, fuse_ino_t parent,
+                                      const char *name, size_t namelen,
+                                      enum fuse_expire_flags flags);
+
 /**
  * This function behaves like fuse_lowlevel_notify_inval_entry() with
  * the following additional effect (at least as of Linux kernel 4.8):
diff --git a/lib/fuse_lowlevel.c b/lib/fuse_lowlevel.c
index e82cd9e9f..7b9d71043 100644
--- a/lib/fuse_lowlevel.c
+++ b/lib/fuse_lowlevel.c
@@ -2161,21 +2161,24 @@
 	return send_notify_iov(se, FUSE_NOTIFY_INVAL_INODE, iov, 2);
 }
 
-int fuse_lowlevel_notify_inval_entry(struct fuse_session *se, fuse_ino_t parent,
-				     const char *name, size_t namelen)
+int fuse_lowlevel_notify_expire_entry(struct fuse_session *se, fuse_ino_t parent,
+                                      const char *name, size_t namelen,
+                                      enum fuse_expire_flags flags)
 {
 	struct fuse_notify_inval_entry_out outarg;
 	struct iovec iov[3];
 
 	if (!se)
 		return -EINVAL;
-	
+
 	if (se->conn.proto_major < 6 || se->conn.proto_minor < 12)
 		return -ENOSYS;
 
 	outarg.parent = parent;
 	outarg.namelen = namelen;
-	outarg.padding = 0;
+	outarg.flags = 0;
+	if (flags & FUSE_LL_EXPIRE_ONLY)
+		outarg.flags |= FUSE_EXPIRE_ONLY;
 
 	iov[1].iov_base = &outarg;
 	iov[1].iov_len = sizeof(outarg);
@@ -2292,6 +2295,13 @@ int fuse_lowlevel_notify_inval_entry(struct fuse_session *se, fuse_ino_t parent,
 	return send_notify_iov(se, FUSE_NOTIFY_INVAL_ENTRY, iov, 3);
 }
 
+int fuse_lowlevel_notify_inval_entry(struct fuse_session *se, fuse_ino_t parent,
+				     const char *name, size_t namelen)
+{
+	return fuse_lowlevel_notify_expire_entry(se, parent, name, namelen, 0);
+}
+
+
 int fuse_lowlevel_notify_delete(struct fuse_session *se,
 				fuse_ino_t parent, fuse_ino_t child,
 				const char *name, size_t namelen)
diff --git a/lib/fuse_versionscript b/lib/fuse_versionscript
index 7e50e7507..795ea4aa9 100644
--- a/lib/fuse_versionscript
+++ b/lib/fuse_versionscript
@@ -151,6 +151,7 @@
 FUSE_3.3 {
 	global:
 		fuse_open_channel;
+		fuse_lowlevel_notify_expire_entry;
 } FUSE_3.2;
 
 # Local Variables: