1 files changed, 86 insertions, 0 deletions
diff --git a/fs/smb/client/dfs.h b/fs/smb/client/dfs.h
new file mode 100644
index 000000000000..1c90df5ecfbd
--- /dev/null
+++ b/fs/smb/client/dfs.h
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2022 Paulo Alcantara <palcantara@suse.de>
+ */
+
+#ifndef _CIFS_DFS_H
+#define _CIFS_DFS_H
+
+#include "cifsglob.h"
+#include "fs_context.h"
+#include "cifs_unicode.h"
+
+struct dfs_root_ses {
+	struct list_head list;
+	struct cifs_ses *ses;
+};
+
+int dfs_parse_target_referral(const char *full_path, const struct dfs_info3_param *ref,
+			      struct smb3_fs_context *ctx);
+int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs);
+
+static inline char *dfs_get_path(struct cifs_sb_info *cifs_sb, const char *path)
+{
+	return dfs_cache_canonical_path(path, cifs_sb->local_nls, cifs_remap(cifs_sb));
+}
+
+static inline int dfs_get_referral(struct cifs_mount_ctx *mnt_ctx, const char *path,
+				   struct dfs_info3_param *ref, struct dfs_cache_tgt_list *tl)
+{
+	struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
+	struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
+
+	return dfs_cache_find(mnt_ctx->xid, ctx->dfs_root_ses, cifs_sb->local_nls,
+			      cifs_remap(cifs_sb), path, ref, tl);
+}
+
+/* Return DFS full path out of a dentry set for automount */
+static inline char *dfs_get_automount_devname(struct dentry *dentry, void *page)
+{
+	struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
+	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+	struct TCP_Server_Info *server = tcon->ses->server;
+	size_t len;
+	char *s;
+
+	spin_lock(&server->srv_lock);
+	if (unlikely(!server->origin_fullpath)) {
+		spin_unlock(&server->srv_lock);
+		return ERR_PTR(-EREMOTE);
+	}
+	spin_unlock(&server->srv_lock);
+
+	s = dentry_path_raw(dentry, page, PATH_MAX);
+	if (IS_ERR(s))
+		return s;
+	/* for root, we want "" */
+	if (!s[1])
+		s++;
+
+	spin_lock(&server->srv_lock);
+	len = strlen(server->origin_fullpath);
+	if (s < (char *)page + len) {
+		spin_unlock(&server->srv_lock);
+		return ERR_PTR(-ENAMETOOLONG);
+	}
+
+	s -= len;
+	memcpy(s, server->origin_fullpath, len);
+	spin_unlock(&server->srv_lock);
+	convert_delimiter(s, '/');
+
+	return s;
+}
+
+static inline void dfs_put_root_smb_sessions(struct list_head *head)
+{
+	struct dfs_root_ses *root, *tmp;
+
+	list_for_each_entry_safe(root, tmp, head, list) {
+		list_del_init(&root->list);
+		cifs_put_smb_ses(root->ses);
+		kfree(root);
+	}
+}
+
+#endif /* _CIFS_DFS_H */