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generic: fold yaffs_git_2010_10_20 patch to generic/files

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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34013 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
juhosg
2012-10-30 14:58:17 +00:00
parent 22c66493c9
commit 34b60fad1a
53 changed files with 11490 additions and 63077 deletions
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105
target/linux/generic/files/fs/yaffs2/yaffs_bitmap.c Normal file
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@@ -0,0 +1,105 @@
/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
* Copyright (C) 2002-2010 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include "yaffs_bitmap.h"
#include "yaffs_trace.h"
/*
* Chunk bitmap manipulations
*/
static Y_INLINE __u8 *yaffs_BlockBits(yaffs_dev_t *dev, int blk)
{
if (blk < dev->internal_start_block || blk > dev->internal_end_block) {
T(YAFFS_TRACE_ERROR,
(TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
blk));
YBUG();
}
return dev->chunk_bits +
(dev->chunk_bit_stride * (blk - dev->internal_start_block));
}
void yaffs_verify_chunk_bit_id(yaffs_dev_t *dev, int blk, int chunk)
{
if (blk < dev->internal_start_block || blk > dev->internal_end_block ||
chunk < 0 || chunk >= dev->param.chunks_per_block) {
T(YAFFS_TRACE_ERROR,
(TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
blk, chunk));
YBUG();
}
}
void yaffs_clear_chunk_bits(yaffs_dev_t *dev, int blk)
{
__u8 *blkBits = yaffs_BlockBits(dev, blk);
memset(blkBits, 0, dev->chunk_bit_stride);
}
void yaffs_clear_chunk_bit(yaffs_dev_t *dev, int blk, int chunk)
{
__u8 *blkBits = yaffs_BlockBits(dev, blk);
yaffs_verify_chunk_bit_id(dev, blk, chunk);
blkBits[chunk / 8] &= ~(1 << (chunk & 7));
}
void yaffs_set_chunk_bit(yaffs_dev_t *dev, int blk, int chunk)
{
__u8 *blkBits = yaffs_BlockBits(dev, blk);
yaffs_verify_chunk_bit_id(dev, blk, chunk);
blkBits[chunk / 8] |= (1 << (chunk & 7));
}
int yaffs_check_chunk_bit(yaffs_dev_t *dev, int blk, int chunk)
{
__u8 *blkBits = yaffs_BlockBits(dev, blk);
yaffs_verify_chunk_bit_id(dev, blk, chunk);
return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
}
int yaffs_still_some_chunks(yaffs_dev_t *dev, int blk)
{
__u8 *blkBits = yaffs_BlockBits(dev, blk);
int i;
for (i = 0; i < dev->chunk_bit_stride; i++) {
if (*blkBits)
return 1;
blkBits++;
}
return 0;
}
int yaffs_count_chunk_bits(yaffs_dev_t *dev, int blk)
{
__u8 *blkBits = yaffs_BlockBits(dev, blk);
int i;
int n = 0;
for (i = 0; i < dev->chunk_bit_stride; i++) {
__u8 x = *blkBits;
while (x) {
if (x & 1)
n++;
x >>= 1;
}
blkBits++;
}
return n;
}