mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
61b29b8268
At present devres.h is included in all files that include dm.h but few make use of it. Also this pulls in linux/compat which adds several more headers. Drop the automatic inclusion and require files to include devres themselves. This provides a good indication of which files use devres. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Anatolij Gustschin <agust@denx.de>
310 lines
8.1 KiB
C
310 lines
8.1 KiB
C
/*
|
|
* 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"
|
|
#include <dm/devres.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);
|
|
|
|
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++;
|
|
}
|
|
}
|
|
}
|