From 753ac610880e6e563d0384bb114f8b41df89e520 Mon Sep 17 00:00:00 2001 From: Charles Manning Date: Wed, 9 May 2012 16:55:17 +0000 Subject: u-boot: Update yaffs2 file system This patch updates the yaffs2 in u-boot to correspond to git://www.aleph1.co.uk/yaffs2 commit id 9ee5d0643e559568dbe62215f76e0a7bd5a63d93 Signed-off-by: Charles Manning --- fs/yaffs2/yaffs_bitmap.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 97 insertions(+) create mode 100644 fs/yaffs2/yaffs_bitmap.c (limited to 'fs/yaffs2/yaffs_bitmap.c') diff --git a/fs/yaffs2/yaffs_bitmap.c b/fs/yaffs2/yaffs_bitmap.c new file mode 100644 index 0000000000..4440e930d6 --- /dev/null +++ b/fs/yaffs2/yaffs_bitmap.c @@ -0,0 +1,97 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2011 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning + * + * 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 inline u8 *yaffs_block_bits(struct yaffs_dev *dev, int blk) +{ + if (blk < dev->internal_start_block || blk > dev->internal_end_block) { + yaffs_trace(YAFFS_TRACE_ERROR, + "BlockBits block %d is not valid", + blk); + BUG(); + } + return dev->chunk_bits + + (dev->chunk_bit_stride * (blk - dev->internal_start_block)); +} + +void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk) +{ + if (blk < dev->internal_start_block || blk > dev->internal_end_block || + chunk < 0 || chunk >= dev->param.chunks_per_block) { + yaffs_trace(YAFFS_TRACE_ERROR, + "Chunk Id (%d:%d) invalid", + blk, chunk); + BUG(); + } +} + +void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk) +{ + u8 *blk_bits = yaffs_block_bits(dev, blk); + + memset(blk_bits, 0, dev->chunk_bit_stride); +} + +void yaffs_clear_chunk_bit(struct yaffs_dev *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(struct yaffs_dev *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(struct yaffs_dev *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(struct yaffs_dev *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(struct yaffs_dev *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++, blk_bits++) + n += hweight8(*blk_bits); + + return n; +} -- cgit