+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program 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 version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2014, Intel Corporation.
+ *
+ * Copyright 2015 Cray Inc, all rights reserved.
+ * Author: Ben Evans.
+ *
+ * Define lu_seq_range associated functions
+ */
+
+#ifndef _SEQ_RANGE_H_
+#define _SEQ_RANGE_H_
+
+#include <lustre/lustre_idl.h>
+
+/**
+ * computes the sequence range type \a range
+ */
+
+static inline unsigned fld_range_type(const struct lu_seq_range *range)
+{
+ return range->lsr_flags & LU_SEQ_RANGE_MASK;
+}
+
+/**
+ * Is this sequence range an OST? \a range
+ */
+
+static inline bool fld_range_is_ost(const struct lu_seq_range *range)
+{
+ return fld_range_type(range) == LU_SEQ_RANGE_OST;
+}
+
+/**
+ * Is this sequence range an MDT? \a range
+ */
+
+static inline bool fld_range_is_mdt(const struct lu_seq_range *range)
+{
+ return fld_range_type(range) == LU_SEQ_RANGE_MDT;
+}
+
+/**
+ * ANY range is only used when the fld client sends a fld query request,
+ * but it does not know whether the seq is an MDT or OST, so it will send the
+ * request with ANY type, which means any seq type from the lookup can be
+ * expected. /a range
+ */
+static inline unsigned fld_range_is_any(const struct lu_seq_range *range)
+{
+ return fld_range_type(range) == LU_SEQ_RANGE_ANY;
+}
+
+/**
+ * Apply flags to range \a range \a flags
+ */
+
+static inline void fld_range_set_type(struct lu_seq_range *range,
+ unsigned flags)
+{
+ range->lsr_flags |= flags;
+}
+
+/**
+ * Add MDT to range type \a range
+ */
+
+static inline void fld_range_set_mdt(struct lu_seq_range *range)
+{
+ fld_range_set_type(range, LU_SEQ_RANGE_MDT);
+}
+
+/**
+ * Add OST to range type \a range
+ */
+
+static inline void fld_range_set_ost(struct lu_seq_range *range)
+{
+ fld_range_set_type(range, LU_SEQ_RANGE_OST);
+}
+
+/**
+ * Add ANY to range type \a range
+ */
+
+static inline void fld_range_set_any(struct lu_seq_range *range)
+{
+ fld_range_set_type(range, LU_SEQ_RANGE_ANY);
+}
+
+/**
+ * computes width of given sequence range \a range
+ */
+
+static inline __u64 lu_seq_range_space(const struct lu_seq_range *range)
+{
+ return range->lsr_end - range->lsr_start;
+}
+
+/**
+ * initialize range to zero \a range
+ */
+
+static inline void lu_seq_range_init(struct lu_seq_range *range)
+{
+ memset(range, 0, sizeof(*range));
+}
+
+/**
+ * check if given seq id \a s is within given range \a range
+ */
+
+static inline bool lu_seq_range_within(const struct lu_seq_range *range,
+ __u64 seq)
+{
+ return seq >= range->lsr_start && seq < range->lsr_end;
+}
+
+/**
+ * Is the range sane? Is the end after the beginning? \a range
+ */
+
+static inline bool lu_seq_range_is_sane(const struct lu_seq_range *range)
+{
+ return range->lsr_end >= range->lsr_start;
+}
+
+/**
+ * Is the range 0? \a range
+ */
+
+static inline bool lu_seq_range_is_zero(const struct lu_seq_range *range)
+{
+ return range->lsr_start == 0 && range->lsr_end == 0;
+}
+
+/**
+ * Is the range out of space? \a range
+ */
+
+static inline bool lu_seq_range_is_exhausted(const struct lu_seq_range *range)
+{
+ return lu_seq_range_space(range) == 0;
+}
+
+/**
+ * return 0 if two ranges have the same location, nonzero if they are
+ * different \a r1 \a r2
+ */
+
+static inline int lu_seq_range_compare_loc(const struct lu_seq_range *r1,
+ const struct lu_seq_range *r2)
+{
+ return r1->lsr_index != r2->lsr_index ||
+ r1->lsr_flags != r2->lsr_flags;
+}
+
+#if !defined(__REQ_LAYOUT_USER__)
+/**
+ * byte swap range structure \a range
+ */
+
+void lustre_swab_lu_seq_range(struct lu_seq_range *range);
+#endif
+/**
+ * printf string and argument list for sequence range
+ */
+#define DRANGE "[%#16.16"LPF64"x-%#16.16"LPF64"x):%x:%s"
+
+#define PRANGE(range) \
+ (range)->lsr_start, \
+ (range)->lsr_end, \
+ (range)->lsr_index, \
+ fld_range_is_mdt(range) ? "mdt" : "ost"
+
+#endif
git://git.whamcloud.com / fs / lustre-release.git / commitdiff