X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=blobdiff_plain;f=yaffs_packedtags2.c;h=6b854cb0eb57be1b21e398f86e46971b99c2bf95;hp=624f8ace1176c1645fce0faf77305369356ead31;hb=3f5560bb6f29bb8f92efae420727ca576e159a61;hpb=6f1de4473200f31d1ca1cf4672baf7afcdec2db0

diff --git a/yaffs_packedtags2.c b/yaffs_packedtags2.c
index 624f8ac..6b854cb 100644
--- a/yaffs_packedtags2.c
+++ b/yaffs_packedtags2.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -9,11 +9,11 @@
  * 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_packedtags2.h"
 #include "yportenv.h"
+#include "yaffs_trace.h"
 #include "yaffs_tagsvalidity.h"
 
 /* This code packs a set of extended tags into a binary structure for
@@ -25,7 +25,7 @@
  * This is defined by having the EXTRA_HEADER_INFO_FLAG set.
  */
 
-/* Extra flags applied to chunkId */
+/* Extra flags applied to chunk_id */
 
 #define EXTRA_HEADER_INFO_FLAG	0x80000000
 #define EXTRA_SHRINK_FLAG	0x40000000
@@ -38,146 +38,161 @@
 #define EXTRA_OBJECT_TYPE_SHIFT (28)
 #define EXTRA_OBJECT_TYPE_MASK  ((0x0F) << EXTRA_OBJECT_TYPE_SHIFT)
 
-static void yaffs_DumpPackedTags2(const yaffs_PackedTags2 * pt)
+
+static void yaffs_DumpPackedTags2TagsPart(const yaffs_PackedTags2TagsPart *ptt)
 {
 	T(YAFFS_TRACE_MTD,
 	  (TSTR("packed tags obj %d chunk %d byte %d seq %d" TENDSTR),
-	   pt->t.objectId, pt->t.chunkId, pt->t.byteCount,
-	   pt->t.sequenceNumber));
+	   ptt->obj_id, ptt->chunk_id, ptt->n_bytes,
+	   ptt->seq_number));
+}
+static void yaffs_DumpPackedTags2(const yaffs_PackedTags2 *pt)
+{
+	yaffs_DumpPackedTags2TagsPart(&pt->t);
 }
 
-static void yaffs_DumpTags2(const yaffs_ExtendedTags * t)
+static void yaffs_DumpTags2(const yaffs_ext_tags *t)
 {
 	T(YAFFS_TRACE_MTD,
 	  (TSTR
-	   ("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte "
-	    "%d del %d ser %d seq %d"
-	    TENDSTR), t->eccResult, t->blockBad, t->chunkUsed, t->objectId,
-	   t->chunkId, t->byteCount, t->chunkDeleted, t->serialNumber,
-	   t->sequenceNumber));
+	   ("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d"
+	    TENDSTR), t->ecc_result, t->block_bad, t->chunk_used, t->obj_id,
+	   t->chunk_id, t->n_bytes, t->is_deleted, t->serial_number,
+	   t->seq_number));
 
 }
 
-void yaffs_PackTags2(yaffs_PackedTags2 * pt, const yaffs_ExtendedTags * t)
+void yaffs_PackTags2TagsPart(yaffs_PackedTags2TagsPart *ptt,
+		const yaffs_ext_tags *t)
 {
-	pt->t.chunkId = t->chunkId;
-	pt->t.sequenceNumber = t->sequenceNumber;
-	pt->t.byteCount = t->byteCount;
-	pt->t.objectId = t->objectId;
+	ptt->chunk_id = t->chunk_id;
+	ptt->seq_number = t->seq_number;
+	ptt->n_bytes = t->n_bytes;
+	ptt->obj_id = t->obj_id;
 
-	if (t->chunkId == 0 && t->extraHeaderInfoAvailable) {
+	if (t->chunk_id == 0 && t->extra_available) {
 		/* Store the extra header info instead */
-		/* We save the parent object in the chunkId */
-		pt->t.chunkId = EXTRA_HEADER_INFO_FLAG
-			| t->extraParentObjectId;
-		if (t->extraIsShrinkHeader) {
-			pt->t.chunkId |= EXTRA_SHRINK_FLAG;
-		}
-		if (t->extraShadows) {
-			pt->t.chunkId |= EXTRA_SHADOWS_FLAG;
-		}
-
-		pt->t.objectId &= ~EXTRA_OBJECT_TYPE_MASK;
-		pt->t.objectId |=
-		    (t->extraObjectType << EXTRA_OBJECT_TYPE_SHIFT);
-
-		if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK) {
-			pt->t.byteCount = t->extraEquivalentObjectId;
-		} else if (t->extraObjectType == YAFFS_OBJECT_TYPE_FILE) {
-			pt->t.byteCount = t->extraFileLength;
-		} else {
-			pt->t.byteCount = 0;
-		}
+		/* We save the parent object in the chunk_id */
+		ptt->chunk_id = EXTRA_HEADER_INFO_FLAG
+			| t->extra_parent_id;
+		if (t->extra_is_shrink)
+			ptt->chunk_id |= EXTRA_SHRINK_FLAG;
+		if (t->extra_shadows)
+			ptt->chunk_id |= EXTRA_SHADOWS_FLAG;
+
+		ptt->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
+		ptt->obj_id |=
+		    (t->extra_obj_type << EXTRA_OBJECT_TYPE_SHIFT);
+
+		if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
+			ptt->n_bytes = t->extra_equiv_id;
+		else if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
+			ptt->n_bytes = t->extra_length;
+		else
+			ptt->n_bytes = 0;
 	}
 
-	yaffs_DumpPackedTags2(pt);
+	yaffs_DumpPackedTags2TagsPart(ptt);
 	yaffs_DumpTags2(t);
+}
+
+
+void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ext_tags *t, int tagsECC)
+{
+	yaffs_PackTags2TagsPart(&pt->t, t);
 
-#ifndef YAFFS_IGNORE_TAGS_ECC
-	{
-		yaffs_ECCCalculateOther((unsigned char *)&pt->t,
+	if(tagsECC)
+		yaffs_ecc_calc_other((unsigned char *)&pt->t,
 					sizeof(yaffs_PackedTags2TagsPart),
 					&pt->ecc);
-	}
-#endif
 }
 
-void yaffs_UnpackTags2(yaffs_ExtendedTags * t, yaffs_PackedTags2 * pt)
+
+void yaffs_unpack_tags2tags_part(yaffs_ext_tags *t,
+		yaffs_PackedTags2TagsPart *ptt)
 {
 
-	memset(t, 0, sizeof(yaffs_ExtendedTags));
+	memset(t, 0, sizeof(yaffs_ext_tags));
 
-	yaffs_InitialiseTags(t);
+	yaffs_init_tags(t);
 
-	if (pt->t.sequenceNumber != 0xFFFFFFFF) {
-		/* Page is in use */
-#ifdef YAFFS_IGNORE_TAGS_ECC
-		{
-			t->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
-		}
-#else
-		{
-			yaffs_ECCOther ecc;
-			int result;
-			yaffs_ECCCalculateOther((unsigned char *)&pt->t,
-						sizeof
-						(yaffs_PackedTags2TagsPart),
-						&ecc);
-			result =
-			    yaffs_ECCCorrectOther((unsigned char *)&pt->t,
-						  sizeof
-						  (yaffs_PackedTags2TagsPart),
-						  &pt->ecc, &ecc);
-			switch(result){
-				case 0: 
-					t->eccResult = YAFFS_ECC_RESULT_NO_ERROR; 
-					break;
-				case 1: 
-					t->eccResult = YAFFS_ECC_RESULT_FIXED;
-					break;
-				case -1:
-					t->eccResult = YAFFS_ECC_RESULT_UNFIXED;
-					break;
-				default:
-					t->eccResult = YAFFS_ECC_RESULT_UNKNOWN;
-			}
-		}
-#endif
-		t->blockBad = 0;
-		t->chunkUsed = 1;
-		t->objectId = pt->t.objectId;
-		t->chunkId = pt->t.chunkId;
-		t->byteCount = pt->t.byteCount;
-		t->chunkDeleted = 0;
-		t->serialNumber = 0;
-		t->sequenceNumber = pt->t.sequenceNumber;
+	if (ptt->seq_number != 0xFFFFFFFF) {
+		t->block_bad = 0;
+		t->chunk_used = 1;
+		t->obj_id = ptt->obj_id;
+		t->chunk_id = ptt->chunk_id;
+		t->n_bytes = ptt->n_bytes;
+		t->is_deleted = 0;
+		t->serial_number = 0;
+		t->seq_number = ptt->seq_number;
 
 		/* Do extra header info stuff */
 
-		if (pt->t.chunkId & EXTRA_HEADER_INFO_FLAG) {
-			t->chunkId = 0;
-			t->byteCount = 0;
-
-			t->extraHeaderInfoAvailable = 1;
-			t->extraParentObjectId =
-			    pt->t.chunkId & (~(ALL_EXTRA_FLAGS));
-			t->extraIsShrinkHeader =
-			    (pt->t.chunkId & EXTRA_SHRINK_FLAG) ? 1 : 0;
-			t->extraShadows =
-			    (pt->t.chunkId & EXTRA_SHADOWS_FLAG) ? 1 : 0;
-			t->extraObjectType =
-			    pt->t.objectId >> EXTRA_OBJECT_TYPE_SHIFT;
-			t->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
-
-			if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK) {
-				t->extraEquivalentObjectId = pt->t.byteCount;
-			} else {
-				t->extraFileLength = pt->t.byteCount;
-			}
+		if (ptt->chunk_id & EXTRA_HEADER_INFO_FLAG) {
+			t->chunk_id = 0;
+			t->n_bytes = 0;
+
+			t->extra_available = 1;
+			t->extra_parent_id =
+			    ptt->chunk_id & (~(ALL_EXTRA_FLAGS));
+			t->extra_is_shrink =
+			    (ptt->chunk_id & EXTRA_SHRINK_FLAG) ? 1 : 0;
+			t->extra_shadows =
+			    (ptt->chunk_id & EXTRA_SHADOWS_FLAG) ? 1 : 0;
+			t->extra_obj_type =
+			    ptt->obj_id >> EXTRA_OBJECT_TYPE_SHIFT;
+			t->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
+
+			if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
+				t->extra_equiv_id = ptt->n_bytes;
+			else
+				t->extra_length = ptt->n_bytes;
 		}
 	}
 
-	yaffs_DumpPackedTags2(pt);
+	yaffs_DumpPackedTags2TagsPart(ptt);
 	yaffs_DumpTags2(t);
 
 }
+
+
+void yaffs_unpack_tags2(yaffs_ext_tags *t, yaffs_PackedTags2 *pt, int tagsECC)
+{
+
+	yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+
+	if (pt->t.seq_number != 0xFFFFFFFF &&
+	    tagsECC){
+		/* Chunk is in use and we need to do ECC */
+		
+		yaffs_ECCOther ecc;
+		int result;
+		yaffs_ecc_calc_other((unsigned char *)&pt->t,
+					sizeof(yaffs_PackedTags2TagsPart),
+					&ecc);
+		result = yaffs_ecc_correct_other((unsigned char *)&pt->t,
+						sizeof(yaffs_PackedTags2TagsPart),
+						&pt->ecc, &ecc);
+		switch (result) {
+			case 0:
+				ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+				break;
+			case 1:
+				ecc_result = YAFFS_ECC_RESULT_FIXED;
+				break;
+			case -1:
+				ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+				break;
+			default:
+				ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
+		}
+	}
+
+	yaffs_unpack_tags2tags_part(t, &pt->t);
+
+	t->ecc_result = ecc_result;
+
+	yaffs_DumpPackedTags2(pt);
+	yaffs_DumpTags2(t);
+}
+