| /* |
| * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. |
| * |
| * 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 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 |
| * 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) |
| |
| |
| static void yaffs_DumpPackedTags2TagsPart(const yaffs_PackedTags2TagsPart *ptt) |
| { |
| T(YAFFS_TRACE_MTD, |
| (TSTR("packed tags obj %d chunk %d byte %d seq %d" TENDSTR), |
| 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_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->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_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; |
| |
| if (t->chunk_id == 0 && t->extra_available) { |
| /* 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 = t->extra_length; |
| else |
| ptt->n_bytes = 0; |
| } |
| |
| yaffs_DumpPackedTags2TagsPart(ptt); |
| yaffs_DumpTags2(t); |
| } |
| |
| |
| void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ext_tags *t, int tagsECC) |
| { |
| yaffs_PackTags2TagsPart(&pt->t, t); |
| |
| if(tagsECC) |
| yaffs_ecc_calc_other((unsigned char *)&pt->t, |
| sizeof(yaffs_PackedTags2TagsPart), |
| &pt->ecc); |
| } |
| |
| |
| void yaffs_unpack_tags2tags_part(yaffs_ext_tags *t, |
| yaffs_PackedTags2TagsPart *ptt) |
| { |
| |
| memset(t, 0, sizeof(yaffs_ext_tags)); |
| |
| yaffs_init_tags(t); |
| |
| 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 (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_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); |
| } |
| |