420 lines
10 KiB
C
420 lines
10 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.
|
|
*/
|
|
|
|
#include "yaffs_yaffs1.h"
|
|
#include "yportenv.h"
|
|
#include "yaffs_trace.h"
|
|
#include "yaffs_bitmap.h"
|
|
#include "yaffs_getblockinfo.h"
|
|
#include "yaffs_nand.h"
|
|
#include "yaffs_attribs.h"
|
|
|
|
int yaffs1_scan(struct yaffs_dev *dev)
|
|
{
|
|
struct yaffs_ext_tags tags;
|
|
int blk;
|
|
int chunk;
|
|
int c;
|
|
int deleted;
|
|
enum yaffs_block_state state;
|
|
LIST_HEAD(hard_list);
|
|
struct yaffs_block_info *bi;
|
|
u32 seq_number;
|
|
struct yaffs_obj_hdr *oh;
|
|
struct yaffs_obj *in;
|
|
struct yaffs_obj *parent;
|
|
int alloc_failed = 0;
|
|
struct yaffs_shadow_fixer *shadow_fixers = NULL;
|
|
u8 *chunk_data;
|
|
|
|
yaffs_trace(YAFFS_TRACE_SCAN,
|
|
"yaffs1_scan starts intstartblk %d intendblk %d...",
|
|
dev->internal_start_block, dev->internal_end_block);
|
|
|
|
chunk_data = yaffs_get_temp_buffer(dev);
|
|
|
|
dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
|
|
|
|
/* Scan all the blocks to determine their state */
|
|
bi = dev->block_info;
|
|
for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
|
|
blk++) {
|
|
yaffs_clear_chunk_bits(dev, blk);
|
|
bi->pages_in_use = 0;
|
|
bi->soft_del_pages = 0;
|
|
|
|
yaffs_query_init_block_state(dev, blk, &state, &seq_number);
|
|
|
|
bi->block_state = state;
|
|
bi->seq_number = seq_number;
|
|
|
|
if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
|
|
bi->block_state = state = YAFFS_BLOCK_STATE_DEAD;
|
|
|
|
yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
|
|
"Block scanning block %d state %d seq %d",
|
|
blk, state, seq_number);
|
|
|
|
if (state == YAFFS_BLOCK_STATE_DEAD) {
|
|
yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
|
|
"block %d is bad", blk);
|
|
} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
|
|
yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
|
|
dev->n_erased_blocks++;
|
|
dev->n_free_chunks += dev->param.chunks_per_block;
|
|
}
|
|
bi++;
|
|
}
|
|
|
|
/* For each block.... */
|
|
for (blk = dev->internal_start_block;
|
|
!alloc_failed && blk <= dev->internal_end_block; blk++) {
|
|
|
|
cond_resched();
|
|
|
|
bi = yaffs_get_block_info(dev, blk);
|
|
state = bi->block_state;
|
|
|
|
deleted = 0;
|
|
|
|
/* For each chunk in each block that needs scanning.... */
|
|
for (c = 0;
|
|
!alloc_failed && c < dev->param.chunks_per_block &&
|
|
state == YAFFS_BLOCK_STATE_NEEDS_SCAN; c++) {
|
|
/* Read the tags and decide what to do */
|
|
chunk = blk * dev->param.chunks_per_block + c;
|
|
|
|
yaffs_rd_chunk_tags_nand(dev, chunk, NULL, &tags);
|
|
|
|
/* Let's have a good look at this chunk... */
|
|
|
|
if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED ||
|
|
tags.is_deleted) {
|
|
/* YAFFS1 only...
|
|
* A deleted chunk
|
|
*/
|
|
deleted++;
|
|
dev->n_free_chunks++;
|
|
} else if (!tags.chunk_used) {
|
|
/* An unassigned chunk in the block
|
|
* This means that either the block is empty or
|
|
* this is the one being allocated from
|
|
*/
|
|
|
|
if (c == 0) {
|
|
/* We're looking at the first chunk in
|
|
*the block so the block is unused */
|
|
state = YAFFS_BLOCK_STATE_EMPTY;
|
|
dev->n_erased_blocks++;
|
|
} else {
|
|
/* this is the block being allocated */
|
|
yaffs_trace(YAFFS_TRACE_SCAN,
|
|
" Allocating from %d %d",
|
|
blk, c);
|
|
state = YAFFS_BLOCK_STATE_ALLOCATING;
|
|
dev->alloc_block = blk;
|
|
dev->alloc_page = c;
|
|
dev->alloc_block_finder = blk;
|
|
|
|
}
|
|
|
|
dev->n_free_chunks +=
|
|
(dev->param.chunks_per_block - c);
|
|
} else if (tags.chunk_id > 0) {
|
|
/* chunk_id > 0 so it is a data chunk... */
|
|
unsigned int endpos;
|
|
|
|
yaffs_set_chunk_bit(dev, blk, c);
|
|
bi->pages_in_use++;
|
|
|
|
in = yaffs_find_or_create_by_number(dev,
|
|
tags.obj_id,
|
|
YAFFS_OBJECT_TYPE_FILE);
|
|
/* PutChunkIntoFile checks for a clash
|
|
* (two data chunks with the same chunk_id).
|
|
*/
|
|
|
|
if (!in)
|
|
alloc_failed = 1;
|
|
|
|
if (in) {
|
|
if (!yaffs_put_chunk_in_file
|
|
(in, tags.chunk_id, chunk, 1))
|
|
alloc_failed = 1;
|
|
}
|
|
|
|
endpos =
|
|
(tags.chunk_id - 1) *
|
|
dev->data_bytes_per_chunk +
|
|
tags.n_bytes;
|
|
if (in &&
|
|
in->variant_type ==
|
|
YAFFS_OBJECT_TYPE_FILE &&
|
|
in->variant.file_variant.scanned_size <
|
|
endpos) {
|
|
in->variant.file_variant.scanned_size =
|
|
endpos;
|
|
if (!dev->param.use_header_file_size) {
|
|
in->variant.
|
|
file_variant.file_size =
|
|
in->variant.
|
|
file_variant.scanned_size;
|
|
}
|
|
|
|
}
|
|
} else {
|
|
/* chunk_id == 0, so it is an ObjectHeader.
|
|
* Make the object
|
|
*/
|
|
yaffs_set_chunk_bit(dev, blk, c);
|
|
bi->pages_in_use++;
|
|
|
|
yaffs_rd_chunk_tags_nand(dev, chunk,
|
|
chunk_data, NULL);
|
|
|
|
oh = (struct yaffs_obj_hdr *)chunk_data;
|
|
|
|
in = yaffs_find_by_number(dev, tags.obj_id);
|
|
if (in && in->variant_type != oh->type) {
|
|
/* This should not happen, but somehow
|
|
* Wev'e ended up with an obj_id that
|
|
* has been reused but not yet deleted,
|
|
* and worse still it has changed type.
|
|
* Delete the old object.
|
|
*/
|
|
|
|
yaffs_del_obj(in);
|
|
in = NULL;
|
|
}
|
|
|
|
in = yaffs_find_or_create_by_number(dev,
|
|
tags.obj_id,
|
|
oh->type);
|
|
|
|
if (!in)
|
|
alloc_failed = 1;
|
|
|
|
if (in && oh->shadows_obj > 0) {
|
|
|
|
struct yaffs_shadow_fixer *fixer;
|
|
fixer =
|
|
kmalloc(sizeof
|
|
(struct yaffs_shadow_fixer),
|
|
GFP_NOFS);
|
|
if (fixer) {
|
|
fixer->next = shadow_fixers;
|
|
shadow_fixers = fixer;
|
|
fixer->obj_id = tags.obj_id;
|
|
fixer->shadowed_id =
|
|
oh->shadows_obj;
|
|
yaffs_trace(YAFFS_TRACE_SCAN,
|
|
" Shadow fixer: %d shadows %d",
|
|
fixer->obj_id,
|
|
fixer->shadowed_id);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (in && in->valid) {
|
|
/* We have already filled this one.
|
|
* We have a duplicate and need to
|
|
* resolve it. */
|
|
|
|
unsigned existing_serial = in->serial;
|
|
unsigned new_serial =
|
|
tags.serial_number;
|
|
|
|
if (((existing_serial + 1) & 3) ==
|
|
new_serial) {
|
|
/* Use new one - destroy the
|
|
* exisiting one */
|
|
yaffs_chunk_del(dev,
|
|
in->hdr_chunk,
|
|
1, __LINE__);
|
|
in->valid = 0;
|
|
} else {
|
|
/* Use existing - destroy
|
|
* this one. */
|
|
yaffs_chunk_del(dev, chunk, 1,
|
|
__LINE__);
|
|
}
|
|
}
|
|
|
|
if (in && !in->valid &&
|
|
(tags.obj_id == YAFFS_OBJECTID_ROOT ||
|
|
tags.obj_id ==
|
|
YAFFS_OBJECTID_LOSTNFOUND)) {
|
|
/* We only load some info, don't fiddle
|
|
* with directory structure */
|
|
in->valid = 1;
|
|
in->variant_type = oh->type;
|
|
|
|
in->yst_mode = oh->yst_mode;
|
|
yaffs_load_attribs(in, oh);
|
|
in->hdr_chunk = chunk;
|
|
in->serial = tags.serial_number;
|
|
|
|
} else if (in && !in->valid) {
|
|
/* we need to load this info */
|
|
|
|
in->valid = 1;
|
|
in->variant_type = oh->type;
|
|
|
|
in->yst_mode = oh->yst_mode;
|
|
yaffs_load_attribs(in, oh);
|
|
in->hdr_chunk = chunk;
|
|
in->serial = tags.serial_number;
|
|
|
|
yaffs_set_obj_name_from_oh(in, oh);
|
|
in->dirty = 0;
|
|
|
|
/* directory stuff...
|
|
* hook up to parent
|
|
*/
|
|
|
|
parent =
|
|
yaffs_find_or_create_by_number
|
|
(dev, oh->parent_obj_id,
|
|
YAFFS_OBJECT_TYPE_DIRECTORY);
|
|
if (!parent)
|
|
alloc_failed = 1;
|
|
if (parent && parent->variant_type ==
|
|
YAFFS_OBJECT_TYPE_UNKNOWN) {
|
|
/* Set up as a directory */
|
|
parent->variant_type =
|
|
YAFFS_OBJECT_TYPE_DIRECTORY;
|
|
INIT_LIST_HEAD(&parent->
|
|
variant.dir_variant.
|
|
children);
|
|
} else if (!parent ||
|
|
parent->variant_type !=
|
|
YAFFS_OBJECT_TYPE_DIRECTORY) {
|
|
/* Hoosterman, a problem....
|
|
* We're trying to use a
|
|
* non-directory as a directory
|
|
*/
|
|
|
|
yaffs_trace(YAFFS_TRACE_ERROR,
|
|
"yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
|
|
);
|
|
parent = dev->lost_n_found;
|
|
}
|
|
|
|
yaffs_add_obj_to_dir(parent, in);
|
|
|
|
switch (in->variant_type) {
|
|
case YAFFS_OBJECT_TYPE_UNKNOWN:
|
|
/* Todo got a problem */
|
|
break;
|
|
case YAFFS_OBJECT_TYPE_FILE:
|
|
if (dev->param.
|
|
use_header_file_size)
|
|
in->variant.
|
|
file_variant.file_size
|
|
= yaffs_oh_to_size(oh);
|
|
break;
|
|
case YAFFS_OBJECT_TYPE_HARDLINK:
|
|
in->variant.
|
|
hardlink_variant.equiv_id =
|
|
oh->equiv_id;
|
|
list_add(&in->hard_links,
|
|
&hard_list);
|
|
break;
|
|
case YAFFS_OBJECT_TYPE_DIRECTORY:
|
|
/* Do nothing */
|
|
break;
|
|
case YAFFS_OBJECT_TYPE_SPECIAL:
|
|
/* Do nothing */
|
|
break;
|
|
case YAFFS_OBJECT_TYPE_SYMLINK:
|
|
in->variant.symlink_variant.
|
|
alias =
|
|
yaffs_clone_str(oh->alias);
|
|
if (!in->variant.
|
|
symlink_variant.alias)
|
|
alloc_failed = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (state == YAFFS_BLOCK_STATE_NEEDS_SCAN) {
|
|
/* If we got this far while scanning,
|
|
* then the block is fully allocated. */
|
|
state = YAFFS_BLOCK_STATE_FULL;
|
|
}
|
|
|
|
if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
|
|
/* If the block was partially allocated then
|
|
* treat it as fully allocated. */
|
|
state = YAFFS_BLOCK_STATE_FULL;
|
|
dev->alloc_block = -1;
|
|
}
|
|
|
|
bi->block_state = state;
|
|
|
|
/* Now let's see if it was dirty */
|
|
if (bi->pages_in_use == 0 &&
|
|
!bi->has_shrink_hdr &&
|
|
bi->block_state == YAFFS_BLOCK_STATE_FULL)
|
|
yaffs_block_became_dirty(dev, blk);
|
|
}
|
|
|
|
/* Ok, we've done all the scanning.
|
|
* Fix up the hard link chains.
|
|
* We should now have scanned all the objects, now it's time to add
|
|
* these hardlinks.
|
|
*/
|
|
|
|
yaffs_link_fixup(dev, &hard_list);
|
|
|
|
/*
|
|
* Fix up any shadowed objects.
|
|
* There should not be more than one of these.
|
|
*/
|
|
{
|
|
struct yaffs_shadow_fixer *fixer;
|
|
struct yaffs_obj *obj;
|
|
|
|
while (shadow_fixers) {
|
|
fixer = shadow_fixers;
|
|
shadow_fixers = fixer->next;
|
|
/* Complete the rename transaction by deleting the
|
|
* shadowed object then setting the object header
|
|
to unshadowed.
|
|
*/
|
|
obj = yaffs_find_by_number(dev, fixer->shadowed_id);
|
|
if (obj)
|
|
yaffs_del_obj(obj);
|
|
|
|
obj = yaffs_find_by_number(dev, fixer->obj_id);
|
|
|
|
if (obj)
|
|
yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
|
|
|
|
kfree(fixer);
|
|
}
|
|
}
|
|
|
|
yaffs_release_temp_buffer(dev, chunk_data);
|
|
|
|
if (alloc_failed)
|
|
return YAFFS_FAIL;
|
|
|
|
yaffs_trace(YAFFS_TRACE_SCAN, "yaffs1_scan ends");
|
|
|
|
return YAFFS_OK;
|
|
}
|