Adding files to yaffs2 directory. Signed-off-by: Tracey Dent <tdent48227@xxxxxxxxx> --- drivers/staging/yaffs2/yaffs_bitmap.c | 105 +++++++++++++++++++++++++++++++++ drivers/staging/yaffs2/yaffs_bitmap.h | 33 ++++++++++ 2 files changed, 138 insertions(+), 0 deletions(-) create mode 100644 drivers/staging/yaffs2/yaffs_bitmap.c create mode 100644 drivers/staging/yaffs2/yaffs_bitmap.h diff --git a/drivers/staging/yaffs2/yaffs_bitmap.c b/drivers/staging/yaffs2/yaffs_bitmap.c new file mode 100644 index 0000000..85c8c1d --- /dev/null +++ b/drivers/staging/yaffs2/yaffs_bitmap.c @@ -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@xxxxxxxxxxxx> + * + * 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_block_bits(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 *blk_bits = yaffs_block_bits(dev, blk); + + memset(blk_bits, 0, dev->chunk_bit_stride); +} + +void yaffs_clear_chunk_bit(yaffs_dev_t *dev, int blk, int chunk) +{ + __u8 *blk_bits = yaffs_block_bits(dev, blk); + + yaffs_verify_chunk_bit_id(dev, blk, chunk); + + blk_bits[chunk / 8] &= ~(1 << (chunk & 7)); +} + +void yaffs_set_chunk_bit(yaffs_dev_t *dev, int blk, int chunk) +{ + __u8 *blk_bits = yaffs_block_bits(dev, blk); + + yaffs_verify_chunk_bit_id(dev, blk, chunk); + + blk_bits[chunk / 8] |= (1 << (chunk & 7)); +} + +int yaffs_check_chunk_bit(yaffs_dev_t *dev, int blk, int chunk) +{ + __u8 *blk_bits = yaffs_block_bits(dev, blk); + yaffs_verify_chunk_bit_id(dev, blk, chunk); + + return (blk_bits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0; +} + +int yaffs_still_some_chunks(yaffs_dev_t *dev, int blk) +{ + __u8 *blk_bits = yaffs_block_bits(dev, blk); + int i; + for (i = 0; i < dev->chunk_bit_stride; i++) { + if (*blk_bits) + return 1; + blk_bits++; + } + return 0; +} + +int yaffs_count_chunk_bits(yaffs_dev_t *dev, int blk) +{ + __u8 *blk_bits = yaffs_block_bits(dev, blk); + int i; + int n = 0; + for (i = 0; i < dev->chunk_bit_stride; i++) { + __u8 x = *blk_bits; + while (x) { + if (x & 1) + n++; + x >>= 1; + } + + blk_bits++; + } + return n; +} + diff --git a/drivers/staging/yaffs2/yaffs_bitmap.h b/drivers/staging/yaffs2/yaffs_bitmap.h new file mode 100644 index 0000000..ea755be --- /dev/null +++ b/drivers/staging/yaffs2/yaffs_bitmap.h @@ -0,0 +1,33 @@ +/* + * 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@xxxxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + */ + +/* + * Chunk bitmap manipulations + */ + +#ifndef __YAFFS_BITMAP_H__ +#define __YAFFS_BITMAP_H__ + +#include "yaffs_guts.h" + +void yaffs_verify_chunk_bit_id(yaffs_dev_t *dev, int blk, int chunk); +void yaffs_clear_chunk_bits(yaffs_dev_t *dev, int blk); +void yaffs_clear_chunk_bit(yaffs_dev_t *dev, int blk, int chunk); +void yaffs_set_chunk_bit(yaffs_dev_t *dev, int blk, int chunk); +int yaffs_check_chunk_bit(yaffs_dev_t *dev, int blk, int chunk); +int yaffs_still_some_chunks(yaffs_dev_t *dev, int blk); +int yaffs_count_chunk_bits(yaffs_dev_t *dev, int blk); + +#endif -- 1.7.3.2.146.gca209 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html