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author | Felix Fietkau <nbd@nbd.name> | 2017-01-08 18:58:29 +0100 |
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committer | Felix Fietkau <nbd@nbd.name> | 2017-01-16 20:40:12 +0100 |
commit | 8ab057f5e4150affe44a630c53a113e74618ab09 (patch) | |
tree | 381cf81653ceaeafa402d30c9f69ab51bd796b41 /target/linux/generic/files/fs/yaffs2/yaffs_summary.c | |
parent | 21591a336198beaffa11d40e3581215ef0fe67ec (diff) | |
download | upstream-8ab057f5e4150affe44a630c53a113e74618ab09.tar.gz upstream-8ab057f5e4150affe44a630c53a113e74618ab09.tar.bz2 upstream-8ab057f5e4150affe44a630c53a113e74618ab09.zip |
kernel: remove yaffs2 support, it is no longer needed
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'target/linux/generic/files/fs/yaffs2/yaffs_summary.c')
-rw-r--r-- | target/linux/generic/files/fs/yaffs2/yaffs_summary.c | 312 |
1 files changed, 0 insertions, 312 deletions
diff --git a/target/linux/generic/files/fs/yaffs2/yaffs_summary.c b/target/linux/generic/files/fs/yaffs2/yaffs_summary.c deleted file mode 100644 index 3c9e72321e..0000000000 --- a/target/linux/generic/files/fs/yaffs2/yaffs_summary.c +++ /dev/null @@ -1,312 +0,0 @@ -/* - * 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 <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. - */ - -/* Summaries write the useful part of the tags for the chunks in a block into an - * an array which is written to the last n chunks of the block. - * Reading the summaries gives all the tags for the block in one read. Much - * faster. - * - * Chunks holding summaries are marked with tags making it look like - * they are part of a fake file. - * - * The summary could also be used during gc. - * - */ - -#include "yaffs_summary.h" -#include "yaffs_packedtags2.h" -#include "yaffs_nand.h" -#include "yaffs_getblockinfo.h" -#include "yaffs_bitmap.h" - -/* - * The summary is built up in an array of summary tags. - * This gets written to the last one or two (maybe more) chunks in a block. - * A summary header is written as the first part of each chunk of summary data. - * The summary header must match or the summary is rejected. - */ - -/* Summary tags don't need the sequence number because that is redundant. */ -struct yaffs_summary_tags { - unsigned obj_id; - unsigned chunk_id; - unsigned n_bytes; -}; - -/* Summary header */ -struct yaffs_summary_header { - unsigned version; /* Must match current version */ - unsigned block; /* Must be this block */ - unsigned seq; /* Must be this sequence number */ - unsigned sum; /* Just add up all the bytes in the tags */ -}; - - -static void yaffs_summary_clear(struct yaffs_dev *dev) -{ - if (!dev->sum_tags) - return; - memset(dev->sum_tags, 0, dev->chunks_per_summary * - sizeof(struct yaffs_summary_tags)); -} - - -void yaffs_summary_deinit(struct yaffs_dev *dev) -{ - kfree(dev->sum_tags); - dev->sum_tags = NULL; - kfree(dev->gc_sum_tags); - dev->gc_sum_tags = NULL; - dev->chunks_per_summary = 0; -} - -int yaffs_summary_init(struct yaffs_dev *dev) -{ - int sum_bytes; - int chunks_used; /* Number of chunks used by summary */ - int sum_tags_bytes; - - sum_bytes = dev->param.chunks_per_block * - sizeof(struct yaffs_summary_tags); - - chunks_used = (sum_bytes + dev->data_bytes_per_chunk - 1)/ - (dev->data_bytes_per_chunk - - sizeof(struct yaffs_summary_header)); - - dev->chunks_per_summary = dev->param.chunks_per_block - chunks_used; - sum_tags_bytes = sizeof(struct yaffs_summary_tags) * - dev->chunks_per_summary; - dev->sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS); - dev->gc_sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS); - if (!dev->sum_tags || !dev->gc_sum_tags) { - yaffs_summary_deinit(dev); - return YAFFS_FAIL; - } - - yaffs_summary_clear(dev); - - return YAFFS_OK; -} - -static unsigned yaffs_summary_sum(struct yaffs_dev *dev) -{ - u8 *sum_buffer = (u8 *)dev->sum_tags; - int i; - unsigned sum = 0; - - i = sizeof(struct yaffs_summary_tags) * - dev->chunks_per_summary; - while (i > 0) { - sum += *sum_buffer; - sum_buffer++; - i--; - } - - return sum; -} - -static int yaffs_summary_write(struct yaffs_dev *dev, int blk) -{ - struct yaffs_ext_tags tags; - u8 *buffer; - u8 *sum_buffer = (u8 *)dev->sum_tags; - int n_bytes; - int chunk_in_nand; - int chunk_in_block; - int result; - int this_tx; - struct yaffs_summary_header hdr; - int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr); - struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk); - - buffer = yaffs_get_temp_buffer(dev); - n_bytes = sizeof(struct yaffs_summary_tags) * - dev->chunks_per_summary; - memset(&tags, 0, sizeof(struct yaffs_ext_tags)); - tags.obj_id = YAFFS_OBJECTID_SUMMARY; - tags.chunk_id = 1; - chunk_in_block = dev->chunks_per_summary; - chunk_in_nand = dev->alloc_block * dev->param.chunks_per_block + - dev->chunks_per_summary; - hdr.version = YAFFS_SUMMARY_VERSION; - hdr.block = blk; - hdr.seq = bi->seq_number; - hdr.sum = yaffs_summary_sum(dev); - - do { - this_tx = n_bytes; - if (this_tx > sum_bytes_per_chunk) - this_tx = sum_bytes_per_chunk; - memcpy(buffer, &hdr, sizeof(hdr)); - memcpy(buffer + sizeof(hdr), sum_buffer, this_tx); - tags.n_bytes = this_tx + sizeof(hdr); - result = yaffs_wr_chunk_tags_nand(dev, chunk_in_nand, - buffer, &tags); - - if (result != YAFFS_OK) - break; - yaffs_set_chunk_bit(dev, blk, chunk_in_block); - bi->pages_in_use++; - dev->n_free_chunks--; - - n_bytes -= this_tx; - sum_buffer += this_tx; - chunk_in_nand++; - chunk_in_block++; - tags.chunk_id++; - } while (result == YAFFS_OK && n_bytes > 0); - yaffs_release_temp_buffer(dev, buffer); - - - if (result == YAFFS_OK) - bi->has_summary = 1; - - - return result; -} - -int yaffs_summary_read(struct yaffs_dev *dev, - struct yaffs_summary_tags *st, - int blk) -{ - struct yaffs_ext_tags tags; - u8 *buffer; - u8 *sum_buffer = (u8 *)st; - int n_bytes; - int chunk_id; - int chunk_in_nand; - int chunk_in_block; - int result; - int this_tx; - struct yaffs_summary_header hdr; - struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk); - int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr); - int sum_tags_bytes; - - sum_tags_bytes = sizeof(struct yaffs_summary_tags) * - dev->chunks_per_summary; - buffer = yaffs_get_temp_buffer(dev); - n_bytes = sizeof(struct yaffs_summary_tags) * dev->chunks_per_summary; - chunk_in_block = dev->chunks_per_summary; - chunk_in_nand = blk * dev->param.chunks_per_block + - dev->chunks_per_summary; - chunk_id = 1; - do { - this_tx = n_bytes; - if (this_tx > sum_bytes_per_chunk) - this_tx = sum_bytes_per_chunk; - result = yaffs_rd_chunk_tags_nand(dev, chunk_in_nand, - buffer, &tags); - - if (tags.chunk_id != chunk_id || - tags.obj_id != YAFFS_OBJECTID_SUMMARY || - tags.chunk_used == 0 || - tags.ecc_result > YAFFS_ECC_RESULT_FIXED || - tags.n_bytes != (this_tx + sizeof(hdr))) - result = YAFFS_FAIL; - if (result != YAFFS_OK) - break; - - if (st == dev->sum_tags) { - /* If we're scanning then update the block info */ - yaffs_set_chunk_bit(dev, blk, chunk_in_block); - bi->pages_in_use++; - } - memcpy(&hdr, buffer, sizeof(hdr)); - memcpy(sum_buffer, buffer + sizeof(hdr), this_tx); - n_bytes -= this_tx; - sum_buffer += this_tx; - chunk_in_nand++; - chunk_in_block++; - chunk_id++; - } while (result == YAFFS_OK && n_bytes > 0); - yaffs_release_temp_buffer(dev, buffer); - - if (result == YAFFS_OK) { - /* Verify header */ - if (hdr.version != YAFFS_SUMMARY_VERSION || - hdr.seq != bi->seq_number || - hdr.sum != yaffs_summary_sum(dev)) - result = YAFFS_FAIL; - } - - if (st == dev->sum_tags && result == YAFFS_OK) - bi->has_summary = 1; - - return result; -} - -int yaffs_summary_add(struct yaffs_dev *dev, - struct yaffs_ext_tags *tags, - int chunk_in_nand) -{ - struct yaffs_packed_tags2_tags_only tags_only; - struct yaffs_summary_tags *sum_tags; - int block_in_nand = chunk_in_nand / dev->param.chunks_per_block; - int chunk_in_block = chunk_in_nand % dev->param.chunks_per_block; - - if (!dev->sum_tags) - return YAFFS_OK; - - if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) { - yaffs_pack_tags2_tags_only(&tags_only, tags); - sum_tags = &dev->sum_tags[chunk_in_block]; - sum_tags->chunk_id = tags_only.chunk_id; - sum_tags->n_bytes = tags_only.n_bytes; - sum_tags->obj_id = tags_only.obj_id; - - if (chunk_in_block == dev->chunks_per_summary - 1) { - /* Time to write out the summary */ - yaffs_summary_write(dev, block_in_nand); - yaffs_summary_clear(dev); - yaffs_skip_rest_of_block(dev); - } - } - return YAFFS_OK; -} - -int yaffs_summary_fetch(struct yaffs_dev *dev, - struct yaffs_ext_tags *tags, - int chunk_in_block) -{ - struct yaffs_packed_tags2_tags_only tags_only; - struct yaffs_summary_tags *sum_tags; - if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) { - sum_tags = &dev->sum_tags[chunk_in_block]; - tags_only.chunk_id = sum_tags->chunk_id; - tags_only.n_bytes = sum_tags->n_bytes; - tags_only.obj_id = sum_tags->obj_id; - yaffs_unpack_tags2_tags_only(tags, &tags_only); - return YAFFS_OK; - } - return YAFFS_FAIL; -} - -void yaffs_summary_gc(struct yaffs_dev *dev, int blk) -{ - struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk); - int i; - - if (!bi->has_summary) - return; - - for (i = dev->chunks_per_summary; - i < dev->param.chunks_per_block; - i++) { - if (yaffs_check_chunk_bit(dev, blk, i)) { - yaffs_clear_chunk_bit(dev, blk, i); - bi->pages_in_use--; - dev->n_free_chunks++; - } - } -} |