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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /include/uapi/linux/dlm.h
Initial import
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diff --git a/include/uapi/linux/dlm.h b/include/uapi/linux/dlm.h
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+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
+**
+** This copyrighted material is made available to anyone wishing to use,
+** modify, copy, or redistribute it subject to the terms and conditions
+** of the GNU General Public License v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#ifndef _UAPI__DLM_DOT_H__
+#define _UAPI__DLM_DOT_H__
+
+/*
+ * Interface to Distributed Lock Manager (DLM)
+ * routines and structures to use DLM lockspaces
+ */
+
+/* Lock levels and flags are here */
+#include <linux/dlmconstants.h>
+#include <linux/types.h>
+
+typedef void dlm_lockspace_t;
+
+/*
+ * Lock status block
+ *
+ * Use this structure to specify the contents of the lock value block. For a
+ * conversion request, this structure is used to specify the lock ID of the
+ * lock. DLM writes the status of the lock request and the lock ID assigned
+ * to the request in the lock status block.
+ *
+ * sb_lkid: the returned lock ID. It is set on new (non-conversion) requests.
+ * It is available when dlm_lock returns.
+ *
+ * sb_lvbptr: saves or returns the contents of the lock's LVB according to rules
+ * shown for the DLM_LKF_VALBLK flag.
+ *
+ * sb_flags: DLM_SBF_DEMOTED is returned if in the process of promoting a lock,
+ * it was first demoted to NL to avoid conversion deadlock.
+ * DLM_SBF_VALNOTVALID is returned if the resource's LVB is marked invalid.
+ *
+ * sb_status: the returned status of the lock request set prior to AST
+ * execution. Possible return values:
+ *
+ * 0 if lock request was successful
+ * -EAGAIN if request would block and is flagged DLM_LKF_NOQUEUE
+ * -DLM_EUNLOCK if unlock request was successful
+ * -DLM_ECANCEL if a cancel completed successfully
+ * -EDEADLK if a deadlock was detected
+ * -ETIMEDOUT if the lock request was canceled due to a timeout
+ */
+
+#define DLM_SBF_DEMOTED 0x01
+#define DLM_SBF_VALNOTVALID 0x02
+#define DLM_SBF_ALTMODE 0x04
+
+struct dlm_lksb {
+ int sb_status;
+ __u32 sb_lkid;
+ char sb_flags;
+ char * sb_lvbptr;
+};
+
+/* dlm_new_lockspace() flags */
+
+#define DLM_LSFL_TIMEWARN 0x00000002
+#define DLM_LSFL_FS 0x00000004
+#define DLM_LSFL_NEWEXCL 0x00000008
+
+
+#endif /* _UAPI__DLM_DOT_H__ */