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/*
* 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 <uapi/linux/lustre/lustre_idl.h>
/**
* computes the sequence range type \a range
*/
static inline unsigned int 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 int 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 int 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 "[%#16.16llx-%#16.16llx]:%x:%s"
#define PRANGE(range) \
(range)->lsr_start, \
(range)->lsr_end, \
(range)->lsr_index, \
fld_range_is_mdt(range) ? "mdt" : "ost"
#endif
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