X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=blobdiff_plain;f=yaffs_yaffs2.c;h=6d4681726a60b3ae63adc3456661a8652790194a;hp=6d3b5160855053aa0e01e31400be3c99edbeab8c;hb=21b2dedaa32ab309f6d1daec966528b7586bd207;hpb=6648cbf52d6695755941ff8607fd7a0cda542e05

diff --git a/yaffs_yaffs2.c b/yaffs_yaffs2.c
index 6d3b516..6d46817 100644
--- a/yaffs_yaffs2.c
+++ b/yaffs_yaffs2.c
@@ -20,6 +20,8 @@
 #include "yaffs_getblockinfo.h"
 #include "yaffs_verify.h"
 #include "yaffs_attribs.h"
+#include "yaffs_summary.h"
+#include "yaffs_endian.h"
 
 /*
  * Checkpoints are really no benefit on very small partitions.
@@ -247,6 +249,18 @@ int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev)
 
 /*--------------------- Checkpointing --------------------*/
 
+static void yaffs2_do_endian_validity_marker(struct yaffs_dev *dev,
+					     struct yaffs_checkpt_validity *v)
+{
+
+	if (!dev->swap_endian)
+		return;
+	v->struct_type = swap_s32(v->struct_type);
+	v->magic = swap_u32(v->magic);
+	v->version = swap_u32(v->version);
+	v->head = swap_u32(v->head);
+}
+
 static int yaffs2_wr_checkpt_validity_marker(struct yaffs_dev *dev, int head)
 {
 	struct yaffs_checkpt_validity cp;
@@ -258,6 +272,8 @@ static int yaffs2_wr_checkpt_validity_marker(struct yaffs_dev *dev, int head)
 	cp.version = YAFFS_CHECKPOINT_VERSION;
 	cp.head = (head) ? 1 : 0;
 
+	yaffs2_do_endian_validity_marker(dev, &cp);
+
 	return (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)) ? 1 : 0;
 }
 
@@ -267,6 +283,7 @@ static int yaffs2_rd_checkpt_validity_marker(struct yaffs_dev *dev, int head)
 	int ok;
 
 	ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+	yaffs2_do_endian_validity_marker(dev, &cp);
 
 	if (ok)
 		ok = (cp.struct_type == sizeof(cp)) &&
@@ -279,6 +296,8 @@ static int yaffs2_rd_checkpt_validity_marker(struct yaffs_dev *dev, int head)
 static void yaffs2_dev_to_checkpt_dev(struct yaffs_checkpt_dev *cp,
 				      struct yaffs_dev *dev)
 {
+	cp->struct_type = sizeof(*cp);
+
 	cp->n_erased_blocks = dev->n_erased_blocks;
 	cp->alloc_block = dev->alloc_block;
 	cp->alloc_page = dev->alloc_page;
@@ -305,28 +324,63 @@ static void yaffs_checkpt_dev_to_dev(struct yaffs_dev *dev,
 	dev->seq_number = cp->seq_number;
 }
 
+static void yaffs2_do_endian_checkpt_dev(struct yaffs_dev *dev,
+				     struct yaffs_checkpt_dev *cp)
+{
+	if (!dev->swap_endian)
+		return;
+	cp->struct_type = swap_s32(cp->struct_type);
+	cp->n_erased_blocks = swap_s32(cp->n_erased_blocks);
+	cp->alloc_block = swap_s32(cp->alloc_block);
+	cp->alloc_page = swap_u32(cp->alloc_page);
+	cp->n_free_chunks = swap_s32(cp->n_free_chunks);
+	cp->n_deleted_files = swap_s32(cp->n_deleted_files);
+	cp->n_unlinked_files = swap_s32(cp->n_unlinked_files);
+	cp->n_bg_deletions = swap_s32(cp->n_bg_deletions);
+}
+
 static int yaffs2_wr_checkpt_dev(struct yaffs_dev *dev)
 {
 	struct yaffs_checkpt_dev cp;
 	u32 n_bytes;
 	u32 n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
 	int ok;
+	int i;
+	union yaffs_block_info_union bu;
 
 	/* Write device runtime values */
 	yaffs2_dev_to_checkpt_dev(&cp, dev);
-	cp.struct_type = sizeof(cp);
+	yaffs2_do_endian_checkpt_dev(dev, &cp);
 
 	ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
 	if (!ok)
 		return 0;
 
-	/* Write block info */
-	n_bytes = n_blocks * sizeof(struct yaffs_block_info);
-	ok = (yaffs2_checkpt_wr(dev, dev->block_info, n_bytes) == n_bytes);
+	/* Write block info. */
+	if (!dev->swap_endian) {
+		n_bytes = n_blocks * sizeof(struct yaffs_block_info);
+		ok = (yaffs2_checkpt_wr(dev, dev->block_info, n_bytes) == n_bytes);
+	} else {
+		/*
+		 * Need to swap the endianisms. We can't do this in place
+		 * since that would damage live data,
+		 * so write one block info at a time using a copy.
+		 */
+		for (i = 0; i < n_blocks && ok; i++) {
+			bu.bi = dev->block_info[i];
+			bu.as_u32[0] = swap_u32(bu.as_u32[0]);
+			bu.as_u32[1] = swap_u32(bu.as_u32[1]);
+			ok = (yaffs2_checkpt_wr(dev, &bu, sizeof(bu)) == sizeof(bu));
+		}
+	}
+
 	if (!ok)
 		return 0;
 
-	/* Write chunk bits */
+	/*
+	 * Write chunk bits. Chunk bits are in bytes so
+	 * no endian conversion is needed.
+	 */
 	n_bytes = n_blocks * dev->chunk_bit_stride;
 	ok = (yaffs2_checkpt_wr(dev, dev->chunk_bits, n_bytes) == n_bytes);
 
@@ -344,6 +398,7 @@ static int yaffs2_rd_checkpt_dev(struct yaffs_dev *dev)
 	ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
 	if (!ok)
 		return 0;
+	yaffs2_do_endian_checkpt_dev(dev, &cp);
 
 	if (cp.struct_type != sizeof(cp))
 		return 0;
@@ -357,27 +412,65 @@ static int yaffs2_rd_checkpt_dev(struct yaffs_dev *dev)
 	if (!ok)
 		return 0;
 
+	if (dev->swap_endian) {
+		/* The block info can just be handled as a list of u32s. */
+		u32 *as_u32 = (u32 *) dev->block_info;
+		u32 n_u32s = n_bytes/sizeof(u32);
+		u32 i;
+
+		for (i=0; i < n_u32s; i++)
+			as_u32[i] = swap_u32(as_u32[i]);
+	}
+
 	n_bytes = n_blocks * dev->chunk_bit_stride;
 
 	ok = (yaffs2_checkpt_rd(dev, dev->chunk_bits, n_bytes) == n_bytes);
 
+
 	return ok ? 1 : 0;
 }
 
+
+static void yaffs2_checkpt_obj_bit_assign(struct yaffs_checkpt_obj *cp,
+					  int bit_offset,
+					  int bit_width,
+					  u32 value)
+{
+	u32 and_mask;
+
+	and_mask = ((1<<bit_width)-1) << bit_offset;
+
+	cp->bit_field &= ~and_mask;
+	cp->bit_field |= ((value << bit_offset) & and_mask);
+}
+
+static u32 yaffs2_checkpt_obj_bit_get(struct yaffs_checkpt_obj *cp,
+				      int bit_offset,
+				      int bit_width)
+{
+	u32 and_mask;
+
+	and_mask = ((1<<bit_width)-1);
+
+	return (cp->bit_field >> bit_offset) & and_mask;
+}
+
 static void yaffs2_obj_checkpt_obj(struct yaffs_checkpt_obj *cp,
 				   struct yaffs_obj *obj)
 {
 	cp->obj_id = obj->obj_id;
 	cp->parent_id = (obj->parent) ? obj->parent->obj_id : 0;
 	cp->hdr_chunk = obj->hdr_chunk;
-	cp->variant_type = obj->variant_type;
-	cp->deleted = obj->deleted;
-	cp->soft_del = obj->soft_del;
-	cp->unlinked = obj->unlinked;
-	cp->fake = obj->fake;
-	cp->rename_allowed = obj->rename_allowed;
-	cp->unlink_allowed = obj->unlink_allowed;
-	cp->serial = obj->serial;
+
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_VARIANT_BITS, obj->variant_type);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_DELETED_BITS, obj->deleted);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_SOFT_DEL_BITS, obj->soft_del);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_UNLINKED_BITS, obj->unlinked);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_FAKE_BITS, obj->fake);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_RENAME_ALLOWED_BITS, obj->rename_allowed);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_UNLINK_ALLOWED_BITS, obj->unlink_allowed);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_SERIAL_BITS, obj->serial);
+
 	cp->n_data_chunks = obj->n_data_chunks;
 
 	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
@@ -390,11 +483,12 @@ static int yaffs2_checkpt_obj_to_obj(struct yaffs_obj *obj,
 				     struct yaffs_checkpt_obj *cp)
 {
 	struct yaffs_obj *parent;
+	u32 cp_variant_type = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_VARIANT_BITS);
 
-	if (obj->variant_type != cp->variant_type) {
+	if (obj->variant_type != cp_variant_type) {
 		yaffs_trace(YAFFS_TRACE_ERROR,
 			"Checkpoint read object %d type %d chunk %d does not match existing object type %d",
-			cp->obj_id, cp->variant_type, cp->hdr_chunk,
+			cp->obj_id, cp_variant_type, cp->hdr_chunk,
 			obj->variant_type);
 		return 0;
 	}
@@ -413,7 +507,7 @@ static int yaffs2_checkpt_obj_to_obj(struct yaffs_obj *obj,
 			yaffs_trace(YAFFS_TRACE_ALWAYS,
 				"Checkpoint read object %d parent %d type %d chunk %d Parent type, %d, not directory",
 				cp->obj_id, cp->parent_id,
-				cp->variant_type, cp->hdr_chunk,
+				cp_variant_type, cp->hdr_chunk,
 				parent->variant_type);
 			return 0;
 		}
@@ -421,26 +515,56 @@ static int yaffs2_checkpt_obj_to_obj(struct yaffs_obj *obj,
 	}
 
 	obj->hdr_chunk = cp->hdr_chunk;
-	obj->variant_type = cp->variant_type;
-	obj->deleted = cp->deleted;
-	obj->soft_del = cp->soft_del;
-	obj->unlinked = cp->unlinked;
-	obj->fake = cp->fake;
-	obj->rename_allowed = cp->rename_allowed;
-	obj->unlink_allowed = cp->unlink_allowed;
-	obj->serial = cp->serial;
+
+	obj->variant_type = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_VARIANT_BITS);
+	obj->deleted = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_DELETED_BITS);
+	obj->soft_del = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_SOFT_DEL_BITS);
+	obj->unlinked = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_UNLINKED_BITS);
+	obj->fake = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_FAKE_BITS);
+	obj->rename_allowed = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_RENAME_ALLOWED_BITS);
+	obj->unlink_allowed = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_UNLINK_ALLOWED_BITS);
+	obj->serial = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_SERIAL_BITS);
+
 	obj->n_data_chunks = cp->n_data_chunks;
 
-	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) {
 		obj->variant.file_variant.file_size = cp->size_or_equiv_obj;
-	else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
+		obj->variant.file_variant.stored_size = cp->size_or_equiv_obj;
+	} else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
 		obj->variant.hardlink_variant.equiv_id = cp->size_or_equiv_obj;
-
+	}
 	if (obj->hdr_chunk > 0)
 		obj->lazy_loaded = 1;
 	return 1;
 }
 
+static void yaffs2_do_endian_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
+{
+	int i;
+	u32 *as_u32 = (u32 *)tn;
+	int tnode_size_u32 = dev->tnode_size / sizeof(u32);
+
+	if (!dev->swap_endian)
+		return;
+	/* Swap all the tnode data as u32s to fix endianisms. */
+	for (i = 0; i<tnode_size_u32; i++)
+		as_u32[i] = swap_u32(as_u32[i]);
+}
+
+struct yaffs_tnode *yaffs2_do_endian_tnode_copy(struct yaffs_dev *dev,
+					       struct yaffs_tnode *tn)
+{
+	if (!dev->swap_endian)
+		return tn;
+
+	memcpy(dev->tn_swap_buffer, tn, dev->tnode_size);
+	tn = dev->tn_swap_buffer;
+
+	yaffs2_do_endian_tnode(dev, tn);
+
+	return tn;
+}
+
 static int yaffs2_checkpt_tnode_worker(struct yaffs_obj *in,
 				       struct yaffs_tnode *tn, u32 level,
 				       int chunk_offset)
@@ -468,12 +592,20 @@ static int yaffs2_checkpt_tnode_worker(struct yaffs_obj *in,
 
 	/* Level 0 tnode */
 	base_offset = chunk_offset << YAFFS_TNODES_LEVEL0_BITS;
+	yaffs_do_endian_u32(dev, &base_offset);
+
 	ok = (yaffs2_checkpt_wr(dev, &base_offset, sizeof(base_offset)) ==
 			sizeof(base_offset));
-	if (ok)
+	if (ok) {
+		/*
+		 * NB Can't do an in-place endian swizzle since that would
+		 * damage current tnode data.
+		 * If a tnode endian conversion is required we do a copy.
+		 */
+		tn = yaffs2_do_endian_tnode_copy(dev, tn);
 		ok = (yaffs2_checkpt_wr(dev, tn, dev->tnode_size) ==
 			dev->tnode_size);
-
+	}
 	return ok;
 }
 
@@ -508,14 +640,18 @@ static int yaffs2_rd_checkpt_tnodes(struct yaffs_obj *obj)
 	ok = (yaffs2_checkpt_rd(dev, &base_chunk, sizeof(base_chunk)) ==
 	      sizeof(base_chunk));
 
+	yaffs_do_endian_u32(dev, &base_chunk);
+
 	while (ok && (~base_chunk)) {
 		nread++;
 		/* Read level 0 tnode */
 
 		tn = yaffs_get_tnode(dev);
-		if (tn)
+		if (tn) {
 			ok = (yaffs2_checkpt_rd(dev, tn, dev->tnode_size) ==
 				dev->tnode_size);
+			yaffs2_do_endian_tnode(dev, tn);
+		}
 		else
 			ok = 0;
 
@@ -524,10 +660,13 @@ static int yaffs2_rd_checkpt_tnodes(struct yaffs_obj *obj)
 						    file_stuct_ptr,
 						    base_chunk, tn) ? 1 : 0;
 
-		if (ok)
+		if (ok) {
 			ok = (yaffs2_checkpt_rd
 			      (dev, &base_chunk,
 			       sizeof(base_chunk)) == sizeof(base_chunk));
+			yaffs_do_endian_u32(dev, &base_chunk);
+		}
+
 	}
 
 	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
@@ -537,6 +676,21 @@ static int yaffs2_rd_checkpt_tnodes(struct yaffs_obj *obj)
 	return ok ? 1 : 0;
 }
 
+
+static void yaffs2_do_endian_checkpt_obj(struct yaffs_dev *dev,
+					 struct yaffs_checkpt_obj *cp)
+{
+	if (!dev->swap_endian)
+		return;
+	cp->struct_type = swap_s32(cp->struct_type);
+	cp->obj_id = swap_u32(cp->obj_id);
+	cp->parent_id = swap_u32(cp->parent_id);
+	cp->hdr_chunk = swap_s32(cp->hdr_chunk);
+	cp->bit_field = swap_u32(cp->bit_field);
+	cp->n_data_chunks = swap_s32(cp->n_data_chunks);
+	cp->size_or_equiv_obj = swap_loff_t(cp->size_or_equiv_obj);
+}
+
 static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev)
 {
 	struct yaffs_obj *obj;
@@ -544,6 +698,7 @@ static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev)
 	int i;
 	int ok = 1;
 	struct list_head *lh;
+	u32 cp_variant_type;
 
 	/* Iterate through the objects in each hash entry,
 	 * dumping them to the checkpointing stream.
@@ -555,12 +710,14 @@ static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev)
 			if (!obj->defered_free) {
 				yaffs2_obj_checkpt_obj(&cp, obj);
 				cp.struct_type = sizeof(cp);
-
+				cp_variant_type = yaffs2_checkpt_obj_bit_get(
+						&cp, CHECKPOINT_VARIANT_BITS);
 				yaffs_trace(YAFFS_TRACE_CHECKPOINT,
 					"Checkpoint write object %d parent %d type %d chunk %d obj addr %p",
 					cp.obj_id, cp.parent_id,
-					cp.variant_type, cp.hdr_chunk, obj);
+					cp_variant_type, cp.hdr_chunk, obj);
 
+				yaffs2_do_endian_checkpt_obj (dev, &cp);
 				ok = (yaffs2_checkpt_wr(dev, &cp,
 						sizeof(cp)) == sizeof(cp));
 
@@ -573,8 +730,9 @@ static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev)
 	}
 
 	/* Dump end of list */
-	memset(&cp, 0xFF, sizeof(struct yaffs_checkpt_obj));
+	memset(&cp, 0xff, sizeof(struct yaffs_checkpt_obj));
 	cp.struct_type = sizeof(cp);
+	yaffs2_do_endian_checkpt_obj (dev, &cp);
 
 	if (ok)
 		ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
@@ -588,11 +746,14 @@ static int yaffs2_rd_checkpt_objs(struct yaffs_dev *dev)
 	struct yaffs_checkpt_obj cp;
 	int ok = 1;
 	int done = 0;
+	u32 cp_variant_type;
 	LIST_HEAD(hard_list);
 
 
 	while (ok && !done) {
 		ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+		yaffs2_do_endian_checkpt_obj (dev, &cp);
+
 		if (cp.struct_type != sizeof(cp)) {
 			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
 				"struct size %d instead of %d ok %d",
@@ -600,9 +761,11 @@ static int yaffs2_rd_checkpt_objs(struct yaffs_dev *dev)
 			ok = 0;
 		}
 
+		cp_variant_type = yaffs2_checkpt_obj_bit_get(
+						&cp, CHECKPOINT_VARIANT_BITS);
 		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
 			"Checkpoint read object %d parent %d type %d chunk %d ",
-			cp.obj_id, cp.parent_id, cp.variant_type,
+			cp.obj_id, cp.parent_id, cp_variant_type,
 			cp.hdr_chunk);
 
 		if (ok && cp.obj_id == ~0) {
@@ -610,7 +773,7 @@ static int yaffs2_rd_checkpt_objs(struct yaffs_dev *dev)
 		} else if (ok) {
 			obj =
 			    yaffs_find_or_create_by_number(dev, cp.obj_id,
-							   cp.variant_type);
+							   cp_variant_type);
 			if (obj) {
 				ok = yaffs2_checkpt_obj_to_obj(obj, &cp);
 				if (!ok)
@@ -641,6 +804,8 @@ static int yaffs2_wr_checkpt_sum(struct yaffs_dev *dev)
 
 	yaffs2_get_checkpt_sum(dev, &checkpt_sum);
 
+	yaffs_do_endian_u32(dev, &checkpt_sum);
+
 	ok = (yaffs2_checkpt_wr(dev, &checkpt_sum, sizeof(checkpt_sum)) ==
 		sizeof(checkpt_sum));
 
@@ -663,6 +828,7 @@ static int yaffs2_rd_checkpt_sum(struct yaffs_dev *dev)
 
 	if (!ok)
 		return 0;
+	yaffs_do_endian_u32(dev, &checkpt_sum1);
 
 	if (checkpt_sum0 != checkpt_sum1)
 		return 0;
@@ -827,6 +993,10 @@ int yaffs2_checkpt_restore(struct yaffs_dev *dev)
 	return retval;
 }
 
+/* End of checkpointing */
+
+/* Hole handling logic for truncate past end of file */
+
 int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size)
 {
 	/* if new_size > old_file_size.
@@ -835,7 +1005,7 @@ int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size)
 	 * of hole marker.
 	 */
 	loff_t old_file_size;
-	int increase;
+	loff_t increase;
 	int small_hole;
 	int result = YAFFS_OK;
 	struct yaffs_dev *dev = NULL;
@@ -868,11 +1038,11 @@ int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size)
 		small_hole = 0;
 
 	if (small_hole)
-		local_buffer = yaffs_get_temp_buffer(dev, __LINE__);
+		local_buffer = yaffs_get_temp_buffer(dev);
 
 	if (local_buffer) {
 		/* fill hole with zero bytes */
-		int pos = old_file_size;
+		loff_t pos = old_file_size;
 		int this_write;
 		int written;
 		memset(local_buffer, 0, dev->data_bytes_per_chunk);
@@ -893,7 +1063,7 @@ int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size)
 			}
 		}
 
-		yaffs_release_temp_buffer(dev, local_buffer, __LINE__);
+		yaffs_release_temp_buffer(dev, local_buffer);
 
 		/* If out of space then reverse any chunks we've added */
 		if (!small_increase_ok)
@@ -911,6 +1081,8 @@ int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size)
 	return result;
 }
 
+/* Yaffs2 scanning */
+
 struct yaffs_block_index {
 	int seq;
 	int block;
@@ -934,13 +1106,14 @@ static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
 		int blk, int chunk_in_block,
 		int *found_chunks,
 		u8 *chunk_data,
-		struct list_head *hard_list)
+		struct list_head *hard_list,
+		int summary_available)
 {
 	struct yaffs_obj_hdr *oh;
 	struct yaffs_obj *in;
 	struct yaffs_obj *parent;
 	int equiv_id;
-	int file_size;
+	loff_t file_size;
 	int is_shrink;
 	int is_unlinked;
 	struct yaffs_ext_tags tags;
@@ -951,7 +1124,17 @@ static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
 	struct yaffs_hardlink_var *hl_var;
 	struct yaffs_symlink_var *sl_var;
 
-	result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL, &tags);
+	if (summary_available) {
+		result = yaffs_summary_fetch(dev, &tags, chunk_in_block);
+		tags.seq_number = bi->seq_number;
+	}
+
+	if (!summary_available || tags.obj_id == 0) {
+		result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL, &tags);
+		dev->tags_used++;
+	} else {
+		dev->summary_used++;
+	}
 
 	/* Let's have a good look at this chunk... */
 
@@ -1011,6 +1194,7 @@ static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
 			dev->n_free_chunks++;
 	} else if (tags.obj_id > YAFFS_MAX_OBJECT_ID ||
 		   tags.chunk_id > YAFFS_MAX_CHUNK_ID ||
+		   tags.obj_id == YAFFS_OBJECTID_SUMMARY ||
 		   (tags.chunk_id > 0 &&
 		     tags.n_bytes > dev->data_bytes_per_chunk) ||
 		   tags.seq_number != bi->seq_number) {
@@ -1021,8 +1205,8 @@ static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
 		dev->n_free_chunks++;
 	} else if (tags.chunk_id > 0) {
 		/* chunk_id > 0 so it is a data chunk... */
-		unsigned int endpos;
-		u32 chunk_base = (tags.chunk_id - 1) *
+		loff_t endpos;
+		loff_t chunk_base = (tags.chunk_id - 1) *
 					dev->data_bytes_per_chunk;
 
 		*found_chunks = 1;
@@ -1055,9 +1239,9 @@ static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
 			endpos = chunk_base + tags.n_bytes;
 
 			if (!in->valid &&
-			    in->variant.file_variant.scanned_size < endpos) {
+			    in->variant.file_variant.stored_size < endpos) {
 				in->variant.file_variant.
-				    scanned_size = endpos;
+				    stored_size = endpos;
 				in->variant.file_variant.
 				    file_size = endpos;
 			}
@@ -1108,6 +1292,8 @@ static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
 
 			oh = (struct yaffs_obj_hdr *)chunk_data;
 
+			yaffs_do_endian_oh(dev, oh);
+
 			if (dev->param.inband_tags) {
 				/* Fix up the header if they got
 				 * corrupted by inband tags */
@@ -1144,9 +1330,9 @@ static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
 				 (tags.extra_available &&
 				  tags.extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
 				)) {
-				u32 this_size = (oh) ?
-					oh->file_size :
-					tags.extra_length;
+				loff_t this_size = (oh) ?
+					yaffs_oh_to_size(dev, oh, 0) :
+					tags.extra_file_size;
 				u32 parent_obj_id = (oh) ?
 					oh->parent_obj_id :
 					tags.extra_parent_id;
@@ -1180,12 +1366,14 @@ static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
 		}
 
 		if (!in->valid && in->variant_type !=
-		    (oh ? oh->type : tags.extra_obj_type))
+		    (oh ? oh->type : tags.extra_obj_type)) {
 			yaffs_trace(YAFFS_TRACE_ERROR,
-				"yaffs tragedy: Bad object type, %d != %d, for object %d at chunk %d during scan",
+				"yaffs tragedy: Bad type, %d != %d, for object %d at chunk %d during scan",
 				oh ? oh->type : tags.extra_obj_type,
 				in->variant_type, tags.obj_id,
 				chunk);
+			in = yaffs_retype_obj(in, oh ? oh->type : tags.extra_obj_type);
+		}
 
 		if (!in->valid &&
 		    (tags.obj_id == YAFFS_OBJECTID_ROOT ||
@@ -1220,7 +1408,7 @@ static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
 				parent = yaffs_find_or_create_by_number(dev,
 						oh->parent_obj_id,
 						YAFFS_OBJECT_TYPE_DIRECTORY);
-				file_size = oh->file_size;
+				file_size = yaffs_oh_to_size(dev, oh, 0);
 				is_shrink = oh->is_shrink;
 				equiv_id = oh->equiv_id;
 			} else {
@@ -1228,7 +1416,7 @@ static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
 				parent = yaffs_find_or_create_by_number(dev,
 						tags.extra_parent_id,
 						YAFFS_OBJECT_TYPE_DIRECTORY);
-				file_size = tags.extra_length;
+				file_size = tags.extra_file_size;
 				is_shrink = tags.extra_is_shrink;
 				equiv_id = tags.extra_equiv_id;
 				in->lazy_loaded = 1;
@@ -1284,7 +1472,7 @@ static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
 				break;
 			case YAFFS_OBJECT_TYPE_FILE:
 				file_var = &in->variant.file_variant;
-				if (file_var->scanned_size < file_size) {
+				if (file_var->stored_size < file_size) {
 					/* This covers the case where the file
 					 * size is greater than the data held.
 					 * This will happen if the file is
@@ -1292,7 +1480,7 @@ static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
 					 * current data extents.
 					 */
 					file_var->file_size = file_size;
-					file_var->scanned_size = file_size;
+					file_var->stored_size = file_size;
 				}
 
 				if (file_var->shrink_size > file_size)
@@ -1336,7 +1524,6 @@ int yaffs2_scan_backwards(struct yaffs_dev *dev)
 	int n_to_scan = 0;
 	enum yaffs_block_state state;
 	int c;
-	int deleted;
 	LIST_HEAD(hard_list);
 	struct yaffs_block_info *bi;
 	u32 seq_number;
@@ -1346,6 +1533,7 @@ int yaffs2_scan_backwards(struct yaffs_dev *dev)
 	int alloc_failed = 0;
 	struct yaffs_block_index *block_index = NULL;
 	int alt_block_index = 0;
+	int summary_available;
 
 	yaffs_trace(YAFFS_TRACE_SCAN,
 		"yaffs2_scan_backwards starts  intstartblk %d intendblk %d...",
@@ -1371,7 +1559,7 @@ int yaffs2_scan_backwards(struct yaffs_dev *dev)
 
 	dev->blocks_in_checkpt = 0;
 
-	chunk_data = yaffs_get_temp_buffer(dev, __LINE__);
+	chunk_data = yaffs_get_temp_buffer(dev);
 
 	/* Scan all the blocks to determine their state */
 	bi = dev->block_info;
@@ -1425,7 +1613,7 @@ int yaffs2_scan_backwards(struct yaffs_dev *dev)
 		bi++;
 	}
 
-	yaffs_trace(YAFFS_TRACE_SCAN, "%d blocks to be sorted...", n_to_scan);
+	yaffs_trace(YAFFS_TRACE_ALWAYS, "%d blocks to be sorted...", n_to_scan);
 
 	cond_resched();
 
@@ -1453,20 +1641,28 @@ int yaffs2_scan_backwards(struct yaffs_dev *dev)
 		/* get the block to scan in the correct order */
 		blk = block_index[block_iter].block;
 		bi = yaffs_get_block_info(dev, blk);
-		deleted = 0;
+
+		summary_available = yaffs_summary_read(dev, dev->sum_tags, blk);
 
 		/* For each chunk in each block that needs scanning.... */
 		found_chunks = 0;
-		for (c = dev->param.chunks_per_block - 1;
+		if (summary_available)
+			c = dev->chunks_per_summary - 1;
+		else
+			c = dev->param.chunks_per_block - 1;
+
+		for (/* c is already initialised */;
 		     !alloc_failed && c >= 0 &&
 		     (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
-		      bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
+		      bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING);
+		      c--) {
 			/* Scan backwards...
 			 * Read the tags and decide what to do
 			 */
 			if (yaffs2_scan_chunk(dev, bi, blk, c,
 					&found_chunks, chunk_data,
-					&hard_list) == YAFFS_FAIL)
+					&hard_list, summary_available) ==
+					YAFFS_FAIL)
 				alloc_failed = 1;
 		}
 
@@ -1498,7 +1694,7 @@ int yaffs2_scan_backwards(struct yaffs_dev *dev)
 	 */
 	yaffs_link_fixup(dev, &hard_list);
 
-	yaffs_release_temp_buffer(dev, chunk_data, __LINE__);
+	yaffs_release_temp_buffer(dev, chunk_data);
 
 	if (alloc_failed)
 		return YAFFS_FAIL;