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efi_gpt: properly fix block offset calculations for partition entries

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In 2346363b, had corrected the offset writing to the disk, but missed
correcting the offset for reading from the entries struct.

Instead of writing a block, just write the single entry, simplifying
the offset logic considerably.
This commit is contained in:
Jessica Hamilton 2015-11-20 19:17:56 +13:00
parent 856cc59e58
commit 08006f7c8f
1 changed files with 5 additions and 8 deletions
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13
src/add-ons/kernel/partitioning_systems/gpt/Header.cpp
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@ -193,14 +193,11 @@ Header::InitCheck() const
status_t
Header::WriteEntry(int fd, uint32 entryIndex)
{
// Determine block to write
off_t blockOffset =
+ entryIndex * fHeader.EntrySize() / fBlockSize;
uint32 entryOffset = entryIndex * fHeader.EntrySize() % fBlockSize;
off_t entryOffset = entryIndex * fHeader.EntrySize();
status_t status = _Write(fd,
(fHeader.EntriesBlock() + blockOffset) * fBlockSize + entryOffset,
fEntries + entryOffset, fBlockSize);
fHeader.EntriesBlock() * fBlockSize + entryOffset,
fEntries + entryOffset, fHeader.EntrySize());
if (status != B_OK)
return status;
@ -209,8 +206,8 @@ Header::WriteEntry(int fd, uint32 entryIndex)
// Write backup
status_t backupStatus = _Write(fd,
(fBackupHeader.EntriesBlock() + blockOffset) * fBlockSize + entryOffset,
fEntries + entryOffset, fBlockSize);
fBackupHeader.EntriesBlock() * fBlockSize + entryOffset,
fEntries + entryOffset, fHeader.EntrySize());
return status == B_OK ? backupStatus : status;
}