/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
- * Copyright (C) 2002-2010 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
#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
* NAND storage
* 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_SHADOWS_FLAG 0x20000000
#define EXTRA_SPARE_FLAGS 0x10000000
-#define ALL_EXTRA_FLAGS 0xF0000000
+#define ALL_EXTRA_FLAGS 0xf0000000
/* Also, the top 4 bits of the object Id are set to the object type. */
#define EXTRA_OBJECT_TYPE_SHIFT (28)
-#define EXTRA_OBJECT_TYPE_MASK ((0x0F) << EXTRA_OBJECT_TYPE_SHIFT)
+#define EXTRA_OBJECT_TYPE_MASK ((0x0f) << EXTRA_OBJECT_TYPE_SHIFT)
-
-static void yaffs_DumpPackedTags2TagsPart(const yaffs_PackedTags2TagsPart *ptt)
+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),
- ptt->objectId, ptt->chunkId, ptt->byteCount,
- ptt->sequenceNumber));
+ yaffs_trace(YAFFS_TRACE_MTD,
+ "packed tags obj %d chunk %d byte %d seq %d",
+ ptt->obj_id, ptt->chunk_id, ptt->n_bytes, ptt->seq_number);
}
-static void yaffs_DumpPackedTags2(const yaffs_PackedTags2 *pt)
+
+static void yaffs_dump_packed_tags2(const struct yaffs_packed_tags2 *pt)
{
- yaffs_DumpPackedTags2TagsPart(&pt->t);
+ yaffs_dump_packed_tags2_tags_only(&pt->t);
}
-static void yaffs_DumpTags2(const yaffs_ExtendedTags *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));
+ yaffs_trace(YAFFS_TRACE_MTD,
+ "ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d",
+ 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_PackTags2TagsPart(yaffs_PackedTags2TagsPart *ptt,
- const yaffs_ExtendedTags *t)
+static int yaffs_check_tags_extra_packable(const struct yaffs_ext_tags *t)
{
- ptt->chunkId = t->chunkId;
- ptt->sequenceNumber = t->sequenceNumber;
- ptt->byteCount = t->byteCount;
- ptt->objectId = t->objectId;
+ if (t->chunk_id != 0 || !t->extra_available)
+ return 0;
+
+ /* Check if the file size is too long to store */
+ if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE &&
+ (t->extra_file_size >> 31) != 0)
+ return 0;
+ return 1;
+}
- if (t->chunkId == 0 && t->extraHeaderInfoAvailable) {
+void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *ptt,
+ const struct yaffs_ext_tags *t)
+{
+ ptt->chunk_id = t->chunk_id;
+ ptt->seq_number = t->seq_number;
+ ptt->n_bytes = t->n_bytes;
+ ptt->obj_id = t->obj_id;
+
+ /* Only store extra tags for object headers.
+ * If it is a file then only store if the file size is short\
+ * enough to fit.
+ */
+ if (yaffs_check_tags_extra_packable(t)) {
/* Store the extra header info instead */
- /* We save the parent object in the chunkId */
- ptt->chunkId = EXTRA_HEADER_INFO_FLAG
- | t->extraParentObjectId;
- if (t->extraIsShrinkHeader)
- ptt->chunkId |= EXTRA_SHRINK_FLAG;
- if (t->extraShadows)
- ptt->chunkId |= EXTRA_SHADOWS_FLAG;
-
- ptt->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
- ptt->objectId |=
- (t->extraObjectType << EXTRA_OBJECT_TYPE_SHIFT);
-
- if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
- ptt->byteCount = t->extraEquivalentObjectId;
- else if (t->extraObjectType == YAFFS_OBJECT_TYPE_FILE)
- ptt->byteCount = t->extraFileLength;
+ /* 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 = (unsigned) t->extra_file_size;
else
- ptt->byteCount = 0;
+ ptt->n_bytes = 0;
}
- yaffs_DumpPackedTags2TagsPart(ptt);
- yaffs_DumpTags2(t);
+ yaffs_dump_packed_tags2_tags_only(ptt);
+ yaffs_dump_tags2(t);
}
-
-void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t, int tagsECC)
+void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt,
+ const struct yaffs_ext_tags *t, int tags_ecc)
{
- yaffs_PackTags2TagsPart(&pt->t, t);
+ yaffs_pack_tags2_tags_only(&pt->t, t);
- if(tagsECC)
- yaffs_ECCCalculateOther((unsigned char *)&pt->t,
- sizeof(yaffs_PackedTags2TagsPart),
- &pt->ecc);
+ if (tags_ecc)
+ yaffs_ecc_calc_other((unsigned char *)&pt->t,
+ sizeof(struct yaffs_packed_tags2_tags_only),
+ &pt->ecc);
}
-
-void yaffs_UnpackTags2TagsPart(yaffs_ExtendedTags *t,
- yaffs_PackedTags2TagsPart *ptt)
+void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
+ struct yaffs_packed_tags2_tags_only *ptt)
{
-
- memset(t, 0, sizeof(yaffs_ExtendedTags));
-
- yaffs_InitialiseTags(t);
-
- if (ptt->sequenceNumber != 0xFFFFFFFF) {
- t->blockBad = 0;
- t->chunkUsed = 1;
- t->objectId = ptt->objectId;
- t->chunkId = ptt->chunkId;
- t->byteCount = ptt->byteCount;
- t->chunkDeleted = 0;
- t->serialNumber = 0;
- t->sequenceNumber = ptt->sequenceNumber;
-
- /* Do extra header info stuff */
-
- if (ptt->chunkId & EXTRA_HEADER_INFO_FLAG) {
- t->chunkId = 0;
- t->byteCount = 0;
-
- t->extraHeaderInfoAvailable = 1;
- t->extraParentObjectId =
- ptt->chunkId & (~(ALL_EXTRA_FLAGS));
- t->extraIsShrinkHeader =
- (ptt->chunkId & EXTRA_SHRINK_FLAG) ? 1 : 0;
- t->extraShadows =
- (ptt->chunkId & EXTRA_SHADOWS_FLAG) ? 1 : 0;
- t->extraObjectType =
- ptt->objectId >> EXTRA_OBJECT_TYPE_SHIFT;
- t->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
-
- if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK)
- t->extraEquivalentObjectId = ptt->byteCount;
- else
- t->extraFileLength = ptt->byteCount;
- }
+ memset(t, 0, sizeof(struct yaffs_ext_tags));
+
+ if (ptt->seq_number == 0xffffffff)
+ return;
+
+ 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 (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_file_size = ptt->n_bytes;
}
-
- yaffs_DumpPackedTags2TagsPart(ptt);
- yaffs_DumpTags2(t);
-
+ yaffs_dump_packed_tags2_tags_only(ptt);
+ yaffs_dump_tags2(t);
}
-
-void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt, int tagsECC)
+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;
- yaffs_ECCResult eccResult = YAFFS_ECC_RESULT_NO_ERROR;
-
- if (pt->t.sequenceNumber != 0xFFFFFFFF &&
- tagsECC){
+ if (pt->t.seq_number != 0xffffffff && tags_ecc) {
/* Chunk is in use and we need to do ECC */
-
- yaffs_ECCOther ecc;
+
+ struct yaffs_ecc_other 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);
+ 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:
- eccResult = YAFFS_ECC_RESULT_NO_ERROR;
- break;
- case 1:
- eccResult = YAFFS_ECC_RESULT_FIXED;
- break;
- case -1:
- eccResult = YAFFS_ECC_RESULT_UNFIXED;
- break;
- default:
- eccResult = YAFFS_ECC_RESULT_UNKNOWN;
+ 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_tags2_tags_only(t, &pt->t);
- yaffs_UnpackTags2TagsPart(t, &pt->t);
+ t->ecc_result = ecc_result;
- t->eccResult = eccResult;
-
- yaffs_DumpPackedTags2(pt);
- yaffs_DumpTags2(t);
+ yaffs_dump_packed_tags2(pt);
+ yaffs_dump_tags2(t);
}
-
projects / yaffs2.git / blobdiff