156 lines
4.8 KiB
C
156 lines
4.8 KiB
C
/*
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* Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
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* Copyright (c) 2015 Kaho Ng (ngkaho1234@gmail.com)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/** @addtogroup lwext4
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* @{
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*/
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/**
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* @file ext4_misc.h
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* @brief Miscellaneous helpers.
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*/
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#ifndef EXT4_MISC_H_
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#define EXT4_MISC_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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/**************************************************************/
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#define EXT4_DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y))
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#define EXT4_ALIGN(x, y) ((y) * EXT4_DIV_ROUND_UP((x), (y)))
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/****************************Endian conversion*****************/
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static inline uint64_t reorder64(uint64_t n)
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{
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return ((n & 0xff) << 56) |
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((n & 0xff00) << 40) |
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((n & 0xff0000) << 24) |
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((n & 0xff000000LL) << 8) |
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((n & 0xff00000000LL) >> 8) |
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((n & 0xff0000000000LL) >> 24) |
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((n & 0xff000000000000LL) >> 40) |
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((n & 0xff00000000000000LL) >> 56);
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}
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static inline uint32_t reorder32(uint32_t n)
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{
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return ((n & 0xff) << 24) |
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((n & 0xff00) << 8) |
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((n & 0xff0000) >> 8) |
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((n & 0xff000000) >> 24);
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}
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static inline uint16_t reorder16(uint16_t n)
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{
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return ((n & 0xff) << 8) |
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((n & 0xff00) >> 8);
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}
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#ifdef CONFIG_BIG_ENDIAN
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#define to_le64(_n) reorder64(_n)
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#define to_le32(_n) reorder32(_n)
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#define to_le16(_n) reorder16(_n)
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#define to_be64(_n) _n
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#define to_be32(_n) _n
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#define to_be16(_n) _n
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#else
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#define to_le64(_n) _n
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#define to_le32(_n) _n
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#define to_le16(_n) _n
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#define to_be64(_n) reorder64(_n)
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#define to_be32(_n) reorder32(_n)
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#define to_be16(_n) reorder16(_n)
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#endif
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/****************************Access macros to ext4 structures*****************/
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#define ext4_get32(s, f) to_le32((s)->f)
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#define ext4_get16(s, f) to_le16((s)->f)
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#define ext4_get8(s, f) (s)->f
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#define ext4_set32(s, f, v) \
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do { \
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(s)->f = to_le32(v); \
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} while (0)
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#define ext4_set16(s, f, v) \
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do { \
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(s)->f = to_le16(v); \
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} while (0)
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#define ext4_set8 \
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(s, f, v) do { (s)->f = (v); } \
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while (0)
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/****************************Access macros to jbd2 structures*****************/
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#define jbd_get32(s, f) to_be32((s)->f)
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#define jbd_get16(s, f) to_be16((s)->f)
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#define jbd_get8(s, f) (s)->f
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#define jbd_set32(s, f, v) \
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do { \
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(s)->f = to_be32(v); \
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} while (0)
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#define jbd_set16(s, f, v) \
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do { \
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(s)->f = to_be16(v); \
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} while (0)
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#define jbd_set8 \
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(s, f, v) do { (s)->f = (v); } \
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while (0)
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#ifdef __GNUC__
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#ifndef __unused
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#define __unused __attribute__ ((__unused__))
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#endif
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#else
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#define __unused
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#endif
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#ifndef offsetof
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#define offsetof(type, field) \
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((size_t)(&(((type *)0)->field)))
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* EXT4_MISC_H_ */
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/**
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* @}
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*/
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