Prepare SPL repo to merge with ZFS repo

[mirror_spl.git] / include / spl / sys / user.h

diff --git a/include/spl/sys/user.h b/include/spl/sys/user.h
new file mode 100644 (file)
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--- /dev/null
+++ b/include/spl/sys/user.h
@@ -0,0 +1,42 @@
+/*
+ *  Copyright (C) 2015 Cluster Inc.
+ *  Produced at ClusterHQ Inc (cf, DISCLAIMER).
+ *  Written by Richard Yao <richard.yao@clusterhq.com>.
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_USER_H
+#define        _SPL_USER_H
+
+/*
+ * We have uf_info_t for areleasef(). We implement areleasef() using a global
+ * linked list of all open file descriptors with the task structs referenced,
+ * so accessing the correct descriptor from areleasef() only requires knowing
+ * about the Linux task_struct. Since this is internal to our compatibility
+ * layer, we make it an opaque type.
+ *
+ * XXX: If the descriptor changes under us and we do not do a getf() between
+ * the change and using it, we would get an incorrect reference.
+ */
+
+struct uf_info;
+typedef struct uf_info uf_info_t;
+
+#define        P_FINFO(x) ((uf_info_t *)x)
+
+#endif /* SPL_USER_H */