1 files changed, 101 insertions, 0 deletions
diff --git a/fs/smb/client/fscache.h b/fs/smb/client/fscache.h
new file mode 100644
index 000000000000..f06cb24f5f3c
--- /dev/null
+++ b/fs/smb/client/fscache.h
@@ -0,0 +1,101 @@
+/* SPDX-License-Identifier: LGPL-2.1 */
+/*
+ *   CIFS filesystem cache interface definitions
+ *
+ *   Copyright (c) 2010 Novell, Inc.
+ *   Authors(s): Suresh Jayaraman (sjayaraman@suse.de>
+ *
+ */
+#ifndef _CIFS_FSCACHE_H
+#define _CIFS_FSCACHE_H
+
+#include <linux/swap.h>
+#include <linux/fscache.h>
+
+#include "cifsglob.h"
+
+/*
+ * Coherency data attached to CIFS volume within the cache
+ */
+struct cifs_fscache_volume_coherency_data {
+	__le64	resource_id;		/* unique server resource id */
+	__le64	vol_create_time;
+	__le32	vol_serial_number;
+} __packed;
+
+/*
+ * Coherency data attached to CIFS inode within the cache.
+ */
+struct cifs_fscache_inode_coherency_data {
+	__le64 last_write_time_sec;
+	__le64 last_change_time_sec;
+	__le32 last_write_time_nsec;
+	__le32 last_change_time_nsec;
+};
+
+#ifdef CONFIG_CIFS_FSCACHE
+
+/*
+ * fscache.c
+ */
+extern int cifs_fscache_get_super_cookie(struct cifs_tcon *);
+extern void cifs_fscache_release_super_cookie(struct cifs_tcon *);
+
+extern void cifs_fscache_get_inode_cookie(struct inode *inode);
+extern void cifs_fscache_release_inode_cookie(struct inode *);
+extern void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update);
+
+static inline
+void cifs_fscache_fill_coherency(struct inode *inode,
+				 struct cifs_fscache_inode_coherency_data *cd)
+{
+	struct timespec64 ctime = inode_get_ctime(inode);
+	struct timespec64 mtime = inode_get_mtime(inode);
+
+	memset(cd, 0, sizeof(*cd));
+	cd->last_write_time_sec   = cpu_to_le64(mtime.tv_sec);
+	cd->last_write_time_nsec  = cpu_to_le32(mtime.tv_nsec);
+	cd->last_change_time_sec  = cpu_to_le64(ctime.tv_sec);
+	cd->last_change_time_nsec = cpu_to_le32(ctime.tv_nsec);
+}
+
+
+static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode)
+{
+	return netfs_i_cookie(&CIFS_I(inode)->netfs);
+}
+
+static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags)
+{
+	struct cifs_fscache_inode_coherency_data cd;
+
+	cifs_fscache_fill_coherency(inode, &cd);
+	fscache_invalidate(cifs_inode_cookie(inode), &cd,
+			   i_size_read(inode), flags);
+}
+
+static inline bool cifs_fscache_enabled(struct inode *inode)
+{
+	return fscache_cookie_enabled(cifs_inode_cookie(inode));
+}
+
+#else /* CONFIG_CIFS_FSCACHE */
+static inline
+void cifs_fscache_fill_coherency(struct inode *inode,
+				 struct cifs_fscache_inode_coherency_data *cd)
+{
+}
+
+static inline int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon) { return 0; }
+static inline void cifs_fscache_release_super_cookie(struct cifs_tcon *tcon) {}
+
+static inline void cifs_fscache_get_inode_cookie(struct inode *inode) {}
+static inline void cifs_fscache_release_inode_cookie(struct inode *inode) {}
+static inline void cifs_fscache_unuse_inode_cookie(struct inode *inode, bool update) {}
+static inline struct fscache_cookie *cifs_inode_cookie(struct inode *inode) { return NULL; }
+static inline void cifs_invalidate_cache(struct inode *inode, unsigned int flags) {}
+static inline bool cifs_fscache_enabled(struct inode *inode) { return false; }
+
+#endif /* CONFIG_CIFS_FSCACHE */
+
+#endif /* _CIFS_FSCACHE_H */