fs/yaffs2/yaffs_yaffs1.c - kernel/windcharger - Git at Google

 /*
  * 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@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"


 int yaffs1_scan(yaffs_dev_t *dev)
 {
 	yaffs_ext_tags tags;
 	int blk;
 	int blockIterator;
 	int startIterator;
 	int endIterator;
 	int result;

 	int chunk;
 	int c;
 	int deleted;
 	yaffs_block_state_t state;
 	yaffs_obj_t *hard_list = NULL;
 	yaffs_block_info_t *bi;
 	__u32 seq_number;
 	yaffs_obj_header *oh;
 	yaffs_obj_t *in;
 	yaffs_obj_t *parent;

 	int alloc_failed = 0;

 	struct yaffs_shadow_fixer_s *shadowFixerList = NULL;


 	__u8 *chunkData;


 	T(YAFFS_TRACE_SCAN,
 	  (TSTR("yaffs1_scan starts  intstartblk %d intendblk %d..." TENDSTR),
 	   dev->internal_start_block, dev->internal_end_block));

 	chunkData = yaffs_get_temp_buffer(dev, __LINE__);

 	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;

 		T(YAFFS_TRACE_SCAN_DEBUG,
 		  (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
 		   state, seq_number));

 		if (state == YAFFS_BLOCK_STATE_DEAD) {
 			T(YAFFS_TRACE_BAD_BLOCKS,
 			  (TSTR("block %d is bad" TENDSTR), blk));
 		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
 			T(YAFFS_TRACE_SCAN_DEBUG,
 			  (TSTR("Block empty " TENDSTR)));
 			dev->n_erased_blocks++;
 			dev->n_free_chunks += dev->param.chunks_per_block;
 		}
 		bi++;
 	}

 	startIterator = dev->internal_start_block;
 	endIterator = dev->internal_end_block;

 	/* For each block.... */
 	for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
 	     blockIterator++) {

 		YYIELD();

 		YYIELD();

 		blk = blockIterator;

 		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_SCANNING; c++) {
 			/* Read the tags and decide what to do */
 			chunk = blk * dev->param.chunks_per_block + c;

 			result = 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++;
 				/*T((" %d %d deleted\n",blk,c)); */
 			} 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 from */
 					T(YAFFS_TRACE_SCAN,
 					  (TSTR
 					   (" Allocating from %d %d" TENDSTR),
 					   blk, c));
 					state = YAFFS_BLOCK_STATE_ALLOCATING;
 					dev->alloc_block = blk;
 					dev->alloc_page = c;
 					dev->alloc_block_finder = blk;
 					/* Set block finder here to encourage the allocator to go forth from here. */

 				}

 				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;
 					}

 				}
 				/* T((" %d %d data %d %d\n",blk,c,tags.obj_id,tags.chunk_id));   */
 			} else {
 				/* chunk_id == 0, so it is an ObjectHeader.
 				 * Thus, we read in the object header and make the object
 				 */
 				yaffs_set_chunk_bit(dev, blk, c);
 				bi->pages_in_use++;

 				result = yaffs_rd_chunk_tags_nand(dev, chunk,
 								chunkData,
 								NULL);

 				oh = (yaffs_obj_header *) chunkData;

 				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 = 0;
 				}

 				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_s *fixer;
 					fixer = YMALLOC(sizeof(struct yaffs_shadow_fixer_s));
 					if (fixer) {
 						fixer->next = shadowFixerList;
 						shadowFixerList = fixer;
 						fixer->obj_id = tags.obj_id;
 						fixer->shadowed_id = oh->shadows_obj;
 						T(YAFFS_TRACE_SCAN,
 						  (TSTR
 						   (" Shadow fixer: %d shadows %d" TENDSTR),
 						   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 existingSerial = in->serial;
 					unsigned newSerial = tags.serial_number;

 					if (((existingSerial + 1) & 3) == newSerial) {
 						/* 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;
 #ifdef CONFIG_YAFFS_WINCE
 					in->win_atime[0] = oh->win_atime[0];
 					in->win_ctime[0] = oh->win_ctime[0];
 					in->win_mtime[0] = oh->win_mtime[0];
 					in->win_atime[1] = oh->win_atime[1];
 					in->win_ctime[1] = oh->win_ctime[1];
 					in->win_mtime[1] = oh->win_mtime[1];
 #else
 					in->yst_uid = oh->yst_uid;
 					in->yst_gid = oh->yst_gid;
 					in->yst_atime = oh->yst_atime;
 					in->yst_mtime = oh->yst_mtime;
 					in->yst_ctime = oh->yst_ctime;
 					in->yst_rdev = oh->yst_rdev;
 #endif
 					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;
 #ifdef CONFIG_YAFFS_WINCE
 					in->win_atime[0] = oh->win_atime[0];
 					in->win_ctime[0] = oh->win_ctime[0];
 					in->win_mtime[0] = oh->win_mtime[0];
 					in->win_atime[1] = oh->win_atime[1];
 					in->win_ctime[1] = oh->win_ctime[1];
 					in->win_mtime[1] = oh->win_mtime[1];
 #else
 					in->yst_uid = oh->yst_uid;
 					in->yst_gid = oh->yst_gid;
 					in->yst_atime = oh->yst_atime;
 					in->yst_mtime = oh->yst_mtime;
 					in->yst_ctime = oh->yst_ctime;
 					in->yst_rdev = oh->yst_rdev;
 #endif
 					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;
 						YINIT_LIST_HEAD(&parent->variant.
 								dir_variant.
 								children);
 					} else if (!parent || parent->variant_type !=
 						   YAFFS_OBJECT_TYPE_DIRECTORY) {
 						/* Hoosterman, another problem....
 						 * We're trying to use a non-directory as a directory
 						 */

 						T(YAFFS_TRACE_ERROR,
 						  (TSTR
 						   ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
 						    TENDSTR)));
 						parent = dev->lost_n_found;
 					}

 					yaffs_add_obj_to_dir(parent, in);

 					if (0 && (parent == dev->del_dir ||
 						  parent == dev->unlinked_dir)) {
 						in->deleted = 1;	/* If it is unlinked at start up then it wants deleting */
 						dev->n_deleted_files++;
 					}
 					/* Note re hardlinks.
 					 * Since we might scan a hardlink before its equivalent object is scanned
 					 * we put them all in a list.
 					 * After scanning is complete, we should have all the objects, so we run through this
 					 * list and fix up all the chains.
 					 */

 					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 =
 							    oh->file_size;

 						break;
 					case YAFFS_OBJECT_TYPE_HARDLINK:
 						in->variant.hardlink_variant.
 							equiv_id =
 							oh->equiv_id;
 						in->hard_links.next =
 							(struct ylist_head *)
 							hard_list;
 						hard_list = in;
 						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_SCANNING) {
 			/* 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 */
 	{
 		struct yaffs_shadow_fixer_s *fixer;
 		yaffs_obj_t *obj;

 		while (shadowFixerList) {
 			fixer = shadowFixerList;
 			shadowFixerList = 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);

 			YFREE(fixer);
 		}
 	}

 	yaffs_release_temp_buffer(dev, chunkData, __LINE__);

 	if (alloc_failed)
 		return YAFFS_FAIL;

 	T(YAFFS_TRACE_SCAN, (TSTR("yaffs1_scan ends" TENDSTR)));


 	return YAFFS_OK;
 }
	/*
	* 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@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"


	int yaffs1_scan(yaffs_dev_t *dev)
	{
	yaffs_ext_tags tags;
	int blk;
	int blockIterator;
	int startIterator;
	int endIterator;
	int result;

	int chunk;
	int c;
	int deleted;
	yaffs_block_state_t state;
	yaffs_obj_t *hard_list = NULL;
	yaffs_block_info_t *bi;
	__u32 seq_number;
	yaffs_obj_header *oh;
	yaffs_obj_t *in;
	yaffs_obj_t *parent;

	int alloc_failed = 0;

	struct yaffs_shadow_fixer_s *shadowFixerList = NULL;


	__u8 *chunkData;



	T(YAFFS_TRACE_SCAN,
	(TSTR("yaffs1_scan starts intstartblk %d intendblk %d..." TENDSTR),
	dev->internal_start_block, dev->internal_end_block));

	chunkData = yaffs_get_temp_buffer(dev, __LINE__);

	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;

	T(YAFFS_TRACE_SCAN_DEBUG,
	(TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
	state, seq_number));

	if (state == YAFFS_BLOCK_STATE_DEAD) {
	T(YAFFS_TRACE_BAD_BLOCKS,
	(TSTR("block %d is bad" TENDSTR), blk));
	} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
	T(YAFFS_TRACE_SCAN_DEBUG,
	(TSTR("Block empty " TENDSTR)));
	dev->n_erased_blocks++;
	dev->n_free_chunks += dev->param.chunks_per_block;
	}
	bi++;
	}

	startIterator = dev->internal_start_block;
	endIterator = dev->internal_end_block;

	/* For each block.... */
	for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
	blockIterator++) {

	YYIELD();

	YYIELD();

	blk = blockIterator;

	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_SCANNING; c++) {
	/* Read the tags and decide what to do */
	chunk = blk * dev->param.chunks_per_block + c;

	result = 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++;
	/T((" %d %d deleted\n",blk,c)); /
	} 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 from */
	T(YAFFS_TRACE_SCAN,
	(TSTR
	(" Allocating from %d %d" TENDSTR),
	blk, c));
	state = YAFFS_BLOCK_STATE_ALLOCATING;
	dev->alloc_block = blk;
	dev->alloc_page = c;
	dev->alloc_block_finder = blk;
	/* Set block finder here to encourage the allocator to go forth from here. */

	}

	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;
	}

	}
	/* T((" %d %d data %d %d\n",blk,c,tags.obj_id,tags.chunk_id)); */
	} else {
	/* chunk_id == 0, so it is an ObjectHeader.
	* Thus, we read in the object header and make the object
	*/
	yaffs_set_chunk_bit(dev, blk, c);
	bi->pages_in_use++;

	result = yaffs_rd_chunk_tags_nand(dev, chunk,
	chunkData,
	NULL);

	oh = (yaffs_obj_header *) chunkData;

	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 = 0;
	}

	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_s *fixer;
	fixer = YMALLOC(sizeof(struct yaffs_shadow_fixer_s));
	if (fixer) {
	fixer->next = shadowFixerList;
	shadowFixerList = fixer;
	fixer->obj_id = tags.obj_id;
	fixer->shadowed_id = oh->shadows_obj;
	T(YAFFS_TRACE_SCAN,
	(TSTR
	(" Shadow fixer: %d shadows %d" TENDSTR),
	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 existingSerial = in->serial;
	unsigned newSerial = tags.serial_number;

	if (((existingSerial + 1) & 3) == newSerial) {
	/* 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;
	#ifdef CONFIG_YAFFS_WINCE
	in->win_atime[0] = oh->win_atime[0];
	in->win_ctime[0] = oh->win_ctime[0];
	in->win_mtime[0] = oh->win_mtime[0];
	in->win_atime[1] = oh->win_atime[1];
	in->win_ctime[1] = oh->win_ctime[1];
	in->win_mtime[1] = oh->win_mtime[1];
	#else
	in->yst_uid = oh->yst_uid;
	in->yst_gid = oh->yst_gid;
	in->yst_atime = oh->yst_atime;
	in->yst_mtime = oh->yst_mtime;
	in->yst_ctime = oh->yst_ctime;
	in->yst_rdev = oh->yst_rdev;
	#endif
	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;
	#ifdef CONFIG_YAFFS_WINCE
	in->win_atime[0] = oh->win_atime[0];
	in->win_ctime[0] = oh->win_ctime[0];
	in->win_mtime[0] = oh->win_mtime[0];
	in->win_atime[1] = oh->win_atime[1];
	in->win_ctime[1] = oh->win_ctime[1];
	in->win_mtime[1] = oh->win_mtime[1];
	#else
	in->yst_uid = oh->yst_uid;
	in->yst_gid = oh->yst_gid;
	in->yst_atime = oh->yst_atime;
	in->yst_mtime = oh->yst_mtime;
	in->yst_ctime = oh->yst_ctime;
	in->yst_rdev = oh->yst_rdev;
	#endif
	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;
	YINIT_LIST_HEAD(&parent->variant.
	dir_variant.
	children);
	} else if (!parent \|\| parent->variant_type !=
	YAFFS_OBJECT_TYPE_DIRECTORY) {
	/* Hoosterman, another problem....
	* We're trying to use a non-directory as a directory
	*/

	T(YAFFS_TRACE_ERROR,
	(TSTR
	("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
	TENDSTR)));
	parent = dev->lost_n_found;
	}

	yaffs_add_obj_to_dir(parent, in);

	if (0 && (parent == dev->del_dir \|\|
	parent == dev->unlinked_dir)) {
	in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
	dev->n_deleted_files++;
	}
	/* Note re hardlinks.
	* Since we might scan a hardlink before its equivalent object is scanned
	* we put them all in a list.
	* After scanning is complete, we should have all the objects, so we run through this
	* list and fix up all the chains.
	*/

	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 =
	oh->file_size;

	break;
	case YAFFS_OBJECT_TYPE_HARDLINK:
	in->variant.hardlink_variant.
	equiv_id =
	oh->equiv_id;
	in->hard_links.next =
	(struct ylist_head *)
	hard_list;
	hard_list = in;
	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_SCANNING) {
	/* 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 */
	{
	struct yaffs_shadow_fixer_s *fixer;
	yaffs_obj_t *obj;

	while (shadowFixerList) {
	fixer = shadowFixerList;
	shadowFixerList = 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);

	YFREE(fixer);
	}
	}

	yaffs_release_temp_buffer(dev, chunkData, __LINE__);

	if (alloc_failed)
	return YAFFS_FAIL;

	T(YAFFS_TRACE_SCAN, (TSTR("yaffs1_scan ends" TENDSTR)));


	return YAFFS_OK;
	}