282 lines
6.9 KiB
C
282 lines
6.9 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2010 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \author Francesco Sacchi <batt@develer.com>
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*
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* \brief KBlock interface
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*/
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#include "kblock.h"
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#define LOG_LEVEL LOG_LVL_ERR
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#define LOG_FORMAT LOG_FMT_VERBOSE
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#include <cfg/log.h>
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#include <string.h>
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INLINE size_t kblock_readDirect(struct KBlock *b, block_idx_t index, void *buf, size_t offset, size_t size)
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{
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KB_ASSERT_METHOD(b, readDirect);
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ASSERT(index < b->blk_cnt);
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return b->priv.vt->readDirect(b, b->priv.blk_start + index, buf, offset, size);
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}
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INLINE size_t kblock_writeDirect(struct KBlock *b, block_idx_t index, const void *buf, size_t offset, size_t size)
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{
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KB_ASSERT_METHOD(b, writeDirect);
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ASSERT(index < b->blk_cnt);
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return b->priv.vt->writeDirect(b, b->priv.blk_start + index, buf, offset, size);
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}
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INLINE size_t kblock_readBuf(struct KBlock *b, void *buf, size_t offset, size_t size)
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{
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KB_ASSERT_METHOD(b, readBuf);
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ASSERT(offset + size <= b->blk_size);
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return b->priv.vt->readBuf(b, buf, offset, size);
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}
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INLINE size_t kblock_writeBuf(struct KBlock *b, const void *buf, size_t offset, size_t size)
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{
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KB_ASSERT_METHOD(b, writeBuf);
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ASSERT(offset + size <= b->blk_size);
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return b->priv.vt->writeBuf(b, buf, offset, size);
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}
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INLINE int kblock_load(struct KBlock *b, block_idx_t index)
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{
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KB_ASSERT_METHOD(b, load);
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ASSERT(index < b->blk_cnt);
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LOG_INFO("index %ld\n", index);
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return b->priv.vt->load(b, b->priv.blk_start + index);
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}
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INLINE int kblock_store(struct KBlock *b, block_idx_t index)
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{
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KB_ASSERT_METHOD(b, store);
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ASSERT(index < b->blk_cnt);
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LOG_INFO("index %ld\n", index);
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return b->priv.vt->store(b, b->priv.blk_start + index);
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}
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INLINE void kblock_setDirty(struct KBlock *b, bool dirty)
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{
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if (dirty)
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b->priv.flags |= KB_CACHE_DIRTY;
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else
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b->priv.flags &= ~KB_CACHE_DIRTY;
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}
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size_t kblock_read(struct KBlock *b, block_idx_t idx, void *buf, size_t offset, size_t size)
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{
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ASSERT(b);
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ASSERT(buf);
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ASSERT(offset + size <= b->blk_size);
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LOG_INFO("blk_idx %ld, offset %u, size %u\n", idx, offset, size);
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if (kblock_buffered(b) && idx == b->priv.curr_blk)
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return kblock_readBuf(b, buf, offset, size);
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else
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return kblock_readDirect(b, idx, buf, offset, size);
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}
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int kblock_flush(struct KBlock *b)
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{
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ASSERT(b);
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if (!kblock_buffered(b))
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return 0;
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if (kblock_cacheDirty(b))
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{
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LOG_INFO("flushing block %ld\n", b->priv.curr_blk);
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if (kblock_store(b, b->priv.curr_blk) == 0)
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kblock_setDirty(b, false);
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else
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return EOF;
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}
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return 0;
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}
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static bool kblock_loadPage(struct KBlock *b, block_idx_t idx)
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{
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ASSERT(b);
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if (idx != b->priv.curr_blk)
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{
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LOG_INFO("loading block %ld\n", idx);
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if (kblock_flush(b) != 0 || kblock_load(b, idx) != 0)
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return false;
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b->priv.curr_blk = idx;
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}
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return true;
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}
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int kblock_trim(struct KBlock *b, block_idx_t start, block_idx_t count)
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{
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ASSERT(start + count <= b->blk_cnt);
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if (kblock_buffered(b))
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{
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if (!kblock_loadPage(b, start))
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return EOF;
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}
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b->priv.blk_start += start;
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b->priv.curr_blk = 0; // adjust logical address
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b->blk_cnt = count;
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return 0;
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}
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size_t kblock_write(struct KBlock *b, block_idx_t idx, const void *buf, size_t offset, size_t size)
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{
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ASSERT(b);
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ASSERT(buf);
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ASSERT(idx < b->blk_cnt);
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ASSERT(offset + size <= b->blk_size);
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LOG_INFO("blk_idx %ld, offset %u, size %u\n", idx, offset, size);
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if (kblock_buffered(b))
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{
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if (!kblock_loadPage(b, idx))
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return 0;
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kblock_setDirty(b, true);
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return kblock_writeBuf(b, buf, offset, size);
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}
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else
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{
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#ifdef _DEBUG
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if (offset != 0 || size != b->blk_size)
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ASSERT(kblock_partialWrite(b));
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#endif
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return kblock_writeDirect(b, idx, buf, offset, size);
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}
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}
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int kblock_copy(struct KBlock *b, block_idx_t src, block_idx_t dest)
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{
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ASSERT(b);
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ASSERT(src < b->blk_cnt);
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ASSERT(dest < b->blk_cnt);
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if (kblock_buffered(b))
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{
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if (!kblock_loadPage(b, src))
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return EOF;
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b->priv.curr_blk = dest;
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kblock_setDirty(b, true);
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return 0;
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}
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else if (kblock_partialWrite(b))
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{
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uint8_t buf[16];
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size_t blk_size = b->blk_size;
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size_t offset = 0;
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while (blk_size)
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{
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size_t size = MIN(sizeof(buf), blk_size);
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if (kblock_readDirect(b, src, buf, offset, size) != size)
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return EOF;
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if (kblock_writeDirect(b, dest, buf, offset, size) != size)
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return EOF;
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blk_size -= size;
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offset += size;
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}
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return 0;
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}
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else
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{
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ASSERT(0);
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return EOF;
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}
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}
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int kblock_swLoad(struct KBlock *b, block_idx_t index)
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{
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/*
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* Since this is a low level API, the index here is a fisical index.
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* If we call another low level API, logical to fisical translation
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* would be applied twice.
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* In order to avoid this we subtract the start block index.
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*/
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ASSERT(index >= b->priv.blk_start);
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return (kblock_readDirect(b, index - b->priv.blk_start, b->priv.buf, 0, b->blk_size) == b->blk_size) ? 0 : EOF;
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}
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int kblock_swStore(struct KBlock *b, block_idx_t index)
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{
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/*
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* Since this is a low level API, the index here is a fisical index.
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* If we call another low level API, logical to fisical translation
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* would be applied twice.
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* In order to avoid this we subtract the start block index.
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*/
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ASSERT(index >= b->priv.blk_start);
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return (kblock_writeDirect(b, index - b->priv.blk_start, b->priv.buf, 0, b->blk_size) == b->blk_size) ? 0 : EOF;
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}
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size_t kblock_swReadBuf(struct KBlock *b, void *buf, size_t offset, size_t size)
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{
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ASSERT(buf);
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ASSERT(offset + size <= b->blk_size);
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memcpy(buf, (uint8_t *)b->priv.buf + offset, size);
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return size;
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}
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size_t kblock_swWriteBuf(struct KBlock *b, const void *buf, size_t offset, size_t size)
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{
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ASSERT(buf);
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ASSERT(offset + size <= b->blk_size);
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memcpy((uint8_t *)b->priv.buf + offset, buf, size);
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return size;
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}
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int kblock_swClose(UNUSED_ARG(struct KBlock, *b))
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{
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return 0;
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}
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