/*
- * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
- * yaffs_packedtags2.c: Tags packing for YAFFS2
- *
- * Copyright (C) 2002 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>
*
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public License
- * version 2.1 as published by the Free Software Foundation.
+ * 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
* 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
#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_dump_packed_tags2_tags_only(const struct
+ yaffs_packed_tags2_tags_only *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_DumpTags2(const yaffs_ExtendedTags * t)
+static void yaffs_dump_packed_tags2(const struct yaffs_packed_tags2 *pt)
+{
+ yaffs_dump_packed_tags2_tags_only(&pt->t);
+}
+
+static void yaffs_dump_tags2(const struct 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_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *ptt,
+ const struct 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_DumpTags2(t);
+ yaffs_dump_packed_tags2_tags_only(ptt);
+ yaffs_dump_tags2(t);
+}
-#ifndef YAFFS_IGNORE_TAGS_ECC
- {
- yaffs_ECCCalculateOther((unsigned char *)&pt->t,
- sizeof(yaffs_PackedTags2TagsPart),
- &pt->ecc);
- }
-#endif
+void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt,
+ const struct yaffs_ext_tags *t, int tags_ecc)
+{
+ yaffs_pack_tags2_tags_only(&pt->t, t);
+
+ if (tags_ecc)
+ yaffs_ecc_calc_other((unsigned char *)&pt->t,
+ sizeof(struct
+ yaffs_packed_tags2_tags_only),
+ &pt->ecc);
}
-void yaffs_UnpackTags2(yaffs_ExtendedTags * t, yaffs_PackedTags2 * pt)
+void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
+ struct yaffs_packed_tags2_tags_only *ptt)
{
- memset(t, 0, sizeof(yaffs_ExtendedTags));
+ memset(t, 0, sizeof(struct 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 = 0;
- }
-#else
- {
- yaffs_ECCOther ecc;
- yaffs_ECCCalculateOther((unsigned char *)&pt->t,
- sizeof
- (yaffs_PackedTags2TagsPart),
- &ecc);
- t->eccResult =
- yaffs_ECCCorrectOther((unsigned char *)&pt->t,
- sizeof
- (yaffs_PackedTags2TagsPart),
- &pt->ecc, &ecc);
- }
-#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_dump_packed_tags2_tags_only(ptt);
+ yaffs_dump_tags2(t);
+
+}
+
+void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt,
+ int tags_ecc)
+{
+
+ enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+
+ if (pt->t.seq_number != 0xFFFFFFFF && tags_ecc) {
+ /* Chunk is in use and we need to do ECC */
+
+ struct yaffs_ecc_other ecc;
+ int result;
+ yaffs_ecc_calc_other((unsigned char *)&pt->t,
+ sizeof(struct
+ yaffs_packed_tags2_tags_only),
+ &ecc);
+ result =
+ yaffs_ecc_correct_other((unsigned char *)&pt->t,
+ sizeof(struct
+ yaffs_packed_tags2_tags_only),
+ &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_DumpPackedTags2(pt);
- yaffs_DumpTags2(t);
+ yaffs_unpack_tags2_tags_only(t, &pt->t);
+
+ t->ecc_result = ecc_result;
+ yaffs_dump_packed_tags2(pt);
+ yaffs_dump_tags2(t);
}