X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=blobdiff_plain;f=yaffs_checkptrw.c;h=e739fb4a104b6261969a5ef869caeb7b87bdbbe3;hp=918c382a4752c416478a0b9b08ed2617ffa25c05;hb=597a9ecaee1fbcad4be10382dca705522a2d5a82;hpb=d9cae0a277c62c660e4802d3b8745500583273da

diff --git a/yaffs_checkptrw.c b/yaffs_checkptrw.c
index 918c382..e739fb4 100644
--- a/yaffs_checkptrw.c
+++ b/yaffs_checkptrw.c
@@ -14,6 +14,52 @@
 #include "yaffs_checkptrw.h"
 #include "yaffs_getblockinfo.h"
 
+struct yaffs_checkpt_chunk_hdr {
+	int version;
+	int seq;
+	u32 sum;
+	u32 xor;
+} ;
+
+
+static int apply_chunk_offset(struct yaffs_dev *dev, int chunk)
+{
+	return chunk - dev->chunk_offset;
+}
+
+static int apply_block_offset(struct yaffs_dev *dev, int block)
+{
+	return block - dev->block_offset;
+}
+
+static void yaffs2_checkpt_init_chunk_hdr(struct yaffs_dev *dev)
+{
+	struct yaffs_checkpt_chunk_hdr hdr;
+
+	hdr.version = YAFFS_CHECKPOINT_VERSION;
+	hdr.seq = dev->checkpt_page_seq;
+	hdr.sum = dev->checkpt_sum;
+	hdr.xor = dev->checkpt_xor;
+
+	dev->checkpt_byte_offs = sizeof(hdr);
+
+	memcpy(dev->checkpt_buffer, &hdr, sizeof(hdr));
+}
+
+static int yaffs2_checkpt_check_chunk_hdr(struct yaffs_dev *dev)
+{
+	struct yaffs_checkpt_chunk_hdr hdr;
+
+	memcpy(&hdr, dev->checkpt_buffer, sizeof(hdr));
+
+	dev->checkpt_byte_offs = sizeof(hdr);
+
+	return hdr.version == YAFFS_CHECKPOINT_VERSION &&
+		hdr.seq == dev->checkpt_page_seq &&
+		hdr.sum == dev->checkpt_sum &&
+		hdr.xor == dev->checkpt_xor;
+}
+
 static int yaffs2_checkpt_space_ok(struct yaffs_dev *dev)
 {
 	int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
@@ -28,7 +74,7 @@ static int yaffs_checkpt_erase(struct yaffs_dev *dev)
 {
 	int i;
 
-	if (!dev->param.erase_fn)
+	if (!dev->drv.drv_erase_fn)
 		return 0;
 	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
 		"checking blocks %d to %d",
@@ -36,21 +82,23 @@ static int yaffs_checkpt_erase(struct yaffs_dev *dev)
 
 	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
 		struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
+		int offset_i = apply_block_offset(dev, i);
+		int result;
+
 		if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
 			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
 			"erasing checkpt block %d", i);
 
 			dev->n_erasures++;
 
-			if (dev->param.
-			    erase_fn(dev,
-				     i - dev->block_offset /* realign */)) {
+			result = dev->drv.drv_erase_fn(dev, offset_i);
+			if(result) {
 				bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
 				dev->n_erased_blocks++;
 				dev->n_free_chunks +=
 				    dev->param.chunks_per_block;
 			} else {
-				dev->param.bad_block_fn(dev, i);
+				dev->drv.drv_mark_bad_fn(dev, offset_i);
 				bi->block_state = YAFFS_BLOCK_STATE_DEAD;
 			}
 		}
@@ -77,8 +125,9 @@ static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev)
 
 		for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
 		     i++) {
-			struct yaffs_block_info *bi =
-			    yaffs_get_block_info(dev, i);
+			struct yaffs_block_info *bi;
+
+			bi = yaffs_get_block_info(dev, i);
 			if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
 				dev->checkpt_next_block = i + 1;
 				dev->checkpt_cur_block = i;
@@ -107,12 +156,12 @@ static void yaffs2_checkpt_find_block(struct yaffs_dev *dev)
 		for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
 		     i++) {
 			int chunk = i * dev->param.chunks_per_block;
-			int realigned_chunk = chunk - dev->chunk_offset;
 			enum yaffs_block_state state;
 			u32 seq;
 
-			dev->param.read_chunk_tags_fn(dev, realigned_chunk,
-						      NULL, &tags);
+			dev->tagger.read_chunk_tags_fn(dev,
+					apply_chunk_offset(dev, chunk),
+					NULL, &tags);
 			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
 				"find next checkpt block: search: block %d state %d oid %d seq %d eccr %d",
 				i, (int) state,
@@ -122,7 +171,9 @@ static void yaffs2_checkpt_find_block(struct yaffs_dev *dev)
 			if (tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA)
 				continue;
 
-			dev->param.query_block_fn(dev, i, &state, &seq);
+			dev->tagger.query_block_fn(dev,
+						apply_block_offset(dev, i),
+						&state, &seq);
 			if (state == YAFFS_BLOCK_STATE_DEAD)
 				continue;
 
@@ -149,9 +200,10 @@ int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing)
 	dev->checkpt_open_write = writing;
 
 	/* Got the functions we need? */
-	if (!dev->param.write_chunk_tags_fn ||
-	    !dev->param.read_chunk_tags_fn ||
-	    !dev->param.erase_fn || !dev->param.bad_block_fn)
+	if (!dev->tagger.write_chunk_tags_fn ||
+	    !dev->tagger.read_chunk_tags_fn ||
+	    !dev->drv.drv_erase_fn ||
+	    !dev->drv.drv_mark_bad_fn)
 		return 0;
 
 	if (writing && !yaffs2_checkpt_space_ok(dev))
@@ -171,13 +223,13 @@ int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing)
 	dev->checkpt_cur_chunk = -1;
 	dev->checkpt_next_block = dev->internal_start_block;
 
-	/* Erase all the blocks in the checkpoint area */
 	if (writing) {
 		memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
-		dev->checkpt_byte_offs = 0;
+		yaffs2_checkpt_init_chunk_hdr(dev);
 		return yaffs_checkpt_erase(dev);
 	}
 
+	/* Opening for a read */
 	/* Set to a value that will kick off a read */
 	dev->checkpt_byte_offs = dev->data_bytes_per_chunk;
 	/* A checkpoint block list of 1 checkpoint block per 16 block is
@@ -209,7 +261,7 @@ int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum)
 static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev)
 {
 	int chunk;
-	int realigned_chunk;
+	int offset_chunk;
 	struct yaffs_ext_tags tags;
 
 	if (dev->checkpt_cur_block < 0) {
@@ -243,13 +295,12 @@ static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev)
 		chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk,
 		tags.obj_id, tags.chunk_id);
 
-	realigned_chunk = chunk - dev->chunk_offset;
+	offset_chunk = apply_chunk_offset(dev, chunk);
 
 	dev->n_page_writes++;
 
-	dev->param.write_chunk_tags_fn(dev, realigned_chunk,
+	dev->tagger.write_chunk_tags_fn(dev, offset_chunk,
 				       dev->checkpt_buffer, &tags);
-	dev->checkpt_byte_offs = 0;
 	dev->checkpt_page_seq++;
 	dev->checkpt_cur_chunk++;
 	if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) {
@@ -258,6 +309,9 @@ static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev)
 	}
 	memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
 
+	yaffs2_checkpt_init_chunk_hdr(dev);
+
+
 	return 1;
 }
 
@@ -297,7 +351,7 @@ int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes)
 	int ok = 1;
 	struct yaffs_ext_tags tags;
 	int chunk;
-	int realigned_chunk;
+	int offset_chunk;
 	u8 *data_bytes = (u8 *) data;
 
 	if (!dev->checkpt_buffer)
@@ -325,12 +379,12 @@ int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes)
 			    dev->param.chunks_per_block +
 			    dev->checkpt_cur_chunk;
 
-			realigned_chunk = chunk - dev->chunk_offset;
+			offset_chunk = apply_chunk_offset(dev, chunk);
 			dev->n_page_reads++;
 
 			/* read in the next chunk */
-			dev->param.read_chunk_tags_fn(dev,
-						realigned_chunk,
+			dev->tagger.read_chunk_tags_fn(dev,
+						offset_chunk,
 						dev->checkpt_buffer,
 						&tags);
 
@@ -340,14 +394,18 @@ int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes)
 				ok = 0;
 				break;
 			}
+			if(!yaffs2_checkpt_check_chunk_hdr(dev)) {
+				ok = 0;
+				break;
+			}
 
-			dev->checkpt_byte_offs = 0;
 			dev->checkpt_page_seq++;
 			dev->checkpt_cur_chunk++;
 
 			if (dev->checkpt_cur_chunk >=
 					dev->param.chunks_per_block)
 				dev->checkpt_cur_block = -1;
+
 		}
 
 		*data_bytes = dev->checkpt_buffer[dev->checkpt_byte_offs];
@@ -367,7 +425,8 @@ int yaffs_checkpt_close(struct yaffs_dev *dev)
 	int i;
 
 	if (dev->checkpt_open_write) {
-		if (dev->checkpt_byte_offs != 0)
+		if (dev->checkpt_byte_offs !=
+			sizeof(sizeof(struct yaffs_checkpt_chunk_hdr)))
 			yaffs2_checkpt_flush_buffer(dev);
 	} else if (dev->checkpt_block_list) {
 		for (i = 0;