+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 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 General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
#include "yaffs_packedtags2.h"
#include "yportenv.h"
+#include "yaffs_trace.h"
+
+/* This code packs a set of extended tags into a binary structure for
+ * NAND storage
+ */
+
+/* Some of the information is "extra" struff which can be packed in to
+ * speed scanning
+ * This is defined by having the EXTRA_HEADER_INFO_FLAG set.
+ */
+
+/* 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
+/* 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)
-void yaffs_PackTags2(yaffs_PackedTags2 *pt, yaffs_ExtendedTags *t)
+static void yaffs_dump_packed_tags2_tags_only(
+ const struct yaffs_packed_tags2_tags_only *ptt)
{
- pt->t.chunkId = t->chunkId;
- pt->t.sequenceNumber = t->sequenceNumber;
- pt->t.byteCount = t->byteCount;
- pt->t.objectId = t->objectId;
-
- yaffs_ECCCalculateOther((unsigned char *)&pt->t,sizeof(yaffs_PackedTags2TagsPart),&pt->ecc);
-
+ 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);
}
-void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt)
+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)
+{
+ 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);
+
+}
-
- if(pt->t.sequenceNumber == 0xFFFFFFFF)
- {
- memset(t,0,sizeof(yaffs_ExtendedTags));
-
+static int yaffs_check_tags_extra_packable(const struct yaffs_ext_tags *t)
+{
+ 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;
+}
+
+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 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->n_bytes = 0;
}
- else
- {
- // Page is in use
- 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);
- 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;
+
+ yaffs_dump_packed_tags2_tags_only(ptt);
+ yaffs_dump_tags2(t);
+}
+
+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_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
+ struct yaffs_packed_tags2_tags_only *ptt)
+{
+ 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_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_unpack_tags2_tags_only(t, &pt->t);
+
+ t->ecc_result = ecc_result;
+
+ yaffs_dump_packed_tags2(pt);
+ yaffs_dump_tags2(t);
+}
projects / yaffs2.git / blobdiff