src/add-ons/kernel/file_systems/btrfs/Chunk.cpp

   1 /*
   2  * Copyright 2011, Haiku Inc. All rights reserved.
   3  * This file may be used under the terms of the MIT License.
   4  *
   5  * Authors:
   6  *              Jérôme Duval
   7  *              Chế Vũ Gia Hy
   8  */
   9
  10
  11 #include "Chunk.h"
  12
  13
  14 //#define TRACE_BTRFS
  15 #ifdef TRACE_BTRFS
  16 #       define TRACE(x...) dprintf("\33[34mbtrfs:\33[0m " x)
  17 #else
  18 #       define TRACE(x...) ;
  19 #endif
  20 #       define FATAL(x...) dprintf("\33[34mbtrfs:\33[0m " x)
  21
  22
  23 Chunk::Chunk(btrfs_chunk* chunk, fsblock_t offset)
  24         :
  25         fChunk(NULL),
  26         fInitStatus(B_OK)
  27 {
  28         fChunkOffset = offset;
  29         fChunk = (btrfs_chunk*)malloc(sizeof(btrfs_chunk)
  30                 + chunk->StripeCount() * sizeof(btrfs_stripe));
  31         if (fChunk == NULL) {
  32                 fInitStatus = B_NO_MEMORY;
  33                 return;
  34         }
  35
  36         memcpy(fChunk, chunk, sizeof(btrfs_chunk)
  37                 + chunk->StripeCount() * sizeof(btrfs_stripe));
  38
  39         TRACE("chunk[0] length %" B_PRIu64 " owner %" B_PRIu64 " stripe_length %"
  40                 B_PRIu64 " type %" B_PRIu64 " stripe_count %u sub_stripes %u "
  41                 "sector_size %" B_PRIu32 "\n", chunk->Length(), chunk->Owner(),
  42                 chunk->StripeLength(), chunk->Type(), chunk->StripeCount(),
  43                 chunk->SubStripes(), chunk->SectorSize());
  44         for (int32 i = 0; i < chunk->StripeCount(); i++) {
  45                 TRACE("chunk.stripe[%" B_PRId32 "].physical %" B_PRId64 " deviceid %"
  46                         B_PRId64 "\n", i, chunk->stripes[i].Offset(),
  47                         chunk->stripes[i].DeviceID());
  48         }
  49 }
  50
  51
  52 Chunk::~Chunk()
  53 {
  54         free(fChunk);
  55 }
  56
  57
  58 uint32
  59 Chunk::Size() const
  60 {
  61         return sizeof(btrfs_chunk)
  62                 + fChunk->StripeCount() * sizeof(btrfs_stripe);
  63 }
  64
  65
  66 status_t
  67 Chunk::FindBlock(off_t logical, off_t& physical)
  68 {
  69         if (fChunk == NULL)
  70                 return B_NO_INIT;
  71
  72         if (logical < (off_t)fChunkOffset
  73                 || logical > (off_t)(fChunkOffset + fChunk->Length()))
  74                 return B_BAD_VALUE;
  75
  76         // only one stripe
  77         physical = logical + fChunk->stripes[0].Offset() - fChunkOffset;
  78         return B_OK;
  79 }
  80