UBUNTU: SAUCE: (noup) Update spl to 0.7.3-1ubuntu1, zfs to 0.7.3-1ubuntu1

[mirror_ubuntu-bionic-kernel.git] / zfs / include / sys / mmp.h

diff --git a/zfs/include/sys/mmp.h b/zfs/include/sys/mmp.h
new file mode 100644 (file)
index 0000000..5b2fea1
--- /dev/null
+++ b/zfs/include/sys/mmp.h
@@ -0,0 +1,64 @@
+/*
+ * CDDL HEADER START
+ *
+ * This file and its contents are supplied under the terms of the
+ * Common Development and Distribution License ("CDDL"), version 1.0.
+ * You may only use this file in accordance with the terms of version
+ * 1.0 of the CDDL.
+ *
+ * A full copy of the text of the CDDL should have accompanied this
+ * source.  A copy of the CDDL is also available via the Internet at
+ * http://www.illumos.org/license/CDDL.
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (C) 2017 by Lawrence Livermore National Security, LLC.
+ */
+
+#ifndef _SYS_MMP_H
+#define        _SYS_MMP_H
+
+#include <sys/spa.h>
+#include <sys/zfs_context.h>
+#include <sys/uberblock_impl.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define        MMP_MIN_INTERVAL                100     /* ms */
+#define        MMP_DEFAULT_INTERVAL            1000    /* ms */
+#define        MMP_DEFAULT_IMPORT_INTERVALS    10
+#define        MMP_DEFAULT_FAIL_INTERVALS      5
+
+typedef struct mmp_thread {
+       kmutex_t        mmp_thread_lock; /* protect thread mgmt fields */
+       kcondvar_t      mmp_thread_cv;
+       kthread_t       *mmp_thread;
+       uint8_t         mmp_thread_exiting;
+       kmutex_t        mmp_io_lock;    /* protect below */
+       hrtime_t        mmp_last_write; /* last successful MMP write */
+       uint64_t        mmp_delay;      /* decaying avg ns between MMP writes */
+       uberblock_t     mmp_ub;         /* last ub written by sync */
+       zio_t           *mmp_zio_root;  /* root of mmp write zios */
+} mmp_thread_t;
+
+
+extern void mmp_init(struct spa *spa);
+extern void mmp_fini(struct spa *spa);
+extern void mmp_thread_start(struct spa *spa);
+extern void mmp_thread_stop(struct spa *spa);
+extern void mmp_update_uberblock(struct spa *spa, struct uberblock *ub);
+extern void mmp_signal_all_threads(void);
+
+/* Global tuning */
+extern ulong_t zfs_multihost_interval;
+extern uint_t zfs_multihost_fail_intervals;
+extern uint_t zfs_multihost_import_intervals;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_MMP_H */