2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2007 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include "yaffs_packedtags2.h"
16 #include "yaffs_tagsvalidity.h"
18 /* This code packs a set of extended tags into a binary structure for
22 /* Some of the information is "extra" struff which can be packed in to
24 * This is defined by having the EXTRA_HEADER_INFO_FLAG set.
27 /* Extra flags applied to chunkId */
29 #define EXTRA_HEADER_INFO_FLAG 0x80000000
30 #define EXTRA_SHRINK_FLAG 0x40000000
31 #define EXTRA_SHADOWS_FLAG 0x20000000
32 #define EXTRA_SPARE_FLAGS 0x10000000
34 #define ALL_EXTRA_FLAGS 0xF0000000
36 /* Also, the top 4 bits of the object Id are set to the object type. */
37 #define EXTRA_OBJECT_TYPE_SHIFT (28)
38 #define EXTRA_OBJECT_TYPE_MASK ((0x0F) << EXTRA_OBJECT_TYPE_SHIFT)
41 static void yaffs_DumpPackedTags2TagsPart(const yaffs_PackedTags2TagsPart
* ptt
)
44 (TSTR("packed tags obj %d chunk %d byte %d seq %d" TENDSTR
),
45 ptt
->objectId
, ptt
->chunkId
, ptt
->byteCount
,
46 ptt
->sequenceNumber
));
48 static void yaffs_DumpPackedTags2(const yaffs_PackedTags2
* pt
)
50 yaffs_DumpPackedTags2TagsPart(&pt
->t
);
53 static void yaffs_DumpTags2(const yaffs_ExtendedTags
* t
)
57 ("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d"
58 TENDSTR
), t
->eccResult
, t
->blockBad
, t
->chunkUsed
, t
->objectId
,
59 t
->chunkId
, t
->byteCount
, t
->chunkDeleted
, t
->serialNumber
,
64 void yaffs_PackTags2TagsPart(yaffs_PackedTags2TagsPart
* ptt
, const yaffs_ExtendedTags
* t
)
66 ptt
->chunkId
= t
->chunkId
;
67 ptt
->sequenceNumber
= t
->sequenceNumber
;
68 ptt
->byteCount
= t
->byteCount
;
69 ptt
->objectId
= t
->objectId
;
71 if (t
->chunkId
== 0 && t
->extraHeaderInfoAvailable
) {
72 /* Store the extra header info instead */
73 /* We save the parent object in the chunkId */
74 ptt
->chunkId
= EXTRA_HEADER_INFO_FLAG
75 | t
->extraParentObjectId
;
76 if (t
->extraIsShrinkHeader
) {
77 ptt
->chunkId
|= EXTRA_SHRINK_FLAG
;
79 if (t
->extraShadows
) {
80 ptt
->chunkId
|= EXTRA_SHADOWS_FLAG
;
83 ptt
->objectId
&= ~EXTRA_OBJECT_TYPE_MASK
;
85 (t
->extraObjectType
<< EXTRA_OBJECT_TYPE_SHIFT
);
87 if (t
->extraObjectType
== YAFFS_OBJECT_TYPE_HARDLINK
) {
88 ptt
->byteCount
= t
->extraEquivalentObjectId
;
89 } else if (t
->extraObjectType
== YAFFS_OBJECT_TYPE_FILE
) {
90 ptt
->byteCount
= t
->extraFileLength
;
96 yaffs_DumpPackedTags2TagsPart(ptt
);
101 void yaffs_PackTags2(yaffs_PackedTags2
* pt
, const yaffs_ExtendedTags
* t
)
103 yaffs_PackTags2TagsPart(&pt
->t
,t
);
105 #ifndef YAFFS_IGNORE_TAGS_ECC
107 yaffs_ECCCalculateOther((unsigned char *)&pt
->t
,
108 sizeof(yaffs_PackedTags2TagsPart
),
115 void yaffs_UnpackTags2TagsPart(yaffs_ExtendedTags
* t
, yaffs_PackedTags2TagsPart
* ptt
)
118 memset(t
, 0, sizeof(yaffs_ExtendedTags
));
120 yaffs_InitialiseTags(t
);
122 if (ptt
->sequenceNumber
!= 0xFFFFFFFF) {
125 t
->objectId
= ptt
->objectId
;
126 t
->chunkId
= ptt
->chunkId
;
127 t
->byteCount
= ptt
->byteCount
;
130 t
->sequenceNumber
= ptt
->sequenceNumber
;
132 /* Do extra header info stuff */
134 if (ptt
->chunkId
& EXTRA_HEADER_INFO_FLAG
) {
138 t
->extraHeaderInfoAvailable
= 1;
139 t
->extraParentObjectId
=
140 ptt
->chunkId
& (~(ALL_EXTRA_FLAGS
));
141 t
->extraIsShrinkHeader
=
142 (ptt
->chunkId
& EXTRA_SHRINK_FLAG
) ? 1 : 0;
144 (ptt
->chunkId
& EXTRA_SHADOWS_FLAG
) ? 1 : 0;
146 ptt
->objectId
>> EXTRA_OBJECT_TYPE_SHIFT
;
147 t
->objectId
&= ~EXTRA_OBJECT_TYPE_MASK
;
149 if (t
->extraObjectType
== YAFFS_OBJECT_TYPE_HARDLINK
) {
150 t
->extraEquivalentObjectId
= ptt
->byteCount
;
152 t
->extraFileLength
= ptt
->byteCount
;
157 yaffs_DumpPackedTags2TagsPart(ptt
);
163 void yaffs_UnpackTags2(yaffs_ExtendedTags
* t
, yaffs_PackedTags2
* pt
)
166 yaffs_UnpackTags2TagsPart(t
,&pt
->t
);
168 if (pt
->t
.sequenceNumber
!= 0xFFFFFFFF) {
170 #ifdef YAFFS_IGNORE_TAGS_ECC
172 t
->eccResult
= YAFFS_ECC_RESULT_NO_ERROR
;
178 yaffs_ECCCalculateOther((unsigned char *)&pt
->t
,
180 (yaffs_PackedTags2TagsPart
),
183 yaffs_ECCCorrectOther((unsigned char *)&pt
->t
,
185 (yaffs_PackedTags2TagsPart
),
189 t
->eccResult
= YAFFS_ECC_RESULT_NO_ERROR
;
192 t
->eccResult
= YAFFS_ECC_RESULT_FIXED
;
195 t
->eccResult
= YAFFS_ECC_RESULT_UNFIXED
;
198 t
->eccResult
= YAFFS_ECC_RESULT_UNKNOWN
;
204 yaffs_DumpPackedTags2(pt
);