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VAX, PDP11: Fix VHD support to save the correct updated part of the Block Allocation Table (BAT) when new blocks are added to a VHD.

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This commit is contained in:
Mark Pizzolato 2014-09-03 13:21:38 -07:00
parent b2aaec0b3e
commit 0dff1076a0
1 changed files with 10 additions and 5 deletions
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15
sim_disk.c
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@ -3821,20 +3821,25 @@ while (sects) {
NULL,
BlockOffset))
goto Fatal_IO_Error;
/* Write just the aligned sector which contains the updated BAT entry */
BATUpdateBufferAddress = (uint8 *)hVHD->BAT - (size_t)NtoHll(hVHD->Dynamic.TableOffset) +
(size_t)((((size_t)&hVHD->BAT[BlockNumber+1]) - (size_t)hVHD->BAT + (size_t)NtoHll(hVHD->Dynamic.TableOffset)) & ~(VHD_DATA_BLOCK_ALIGNMENT-1));
/* Since a large VHD can have a pretty large BAT, and we've only changed one longword bat entry
in the current BAT, we write just the aligned sector which contains the updated BAT entry */
BATUpdateBufferAddress = (uint8 *)hVHD->BAT - (size_t)NtoHll(hVHD->Dynamic.TableOffset) +
(size_t)((((size_t)&hVHD->BAT[BlockNumber]) - (size_t)hVHD->BAT + (size_t)NtoHll(hVHD->Dynamic.TableOffset)) & ~(VHD_DATA_BLOCK_ALIGNMENT-1));
/* If the starting of the BAT isn't on a VHD_DATA_BLOCK_ALIGNMENT boundary and we've just updated
a BAT entry early in the array, the buffer computed address might be before the start of the
BAT table. If so, only write the BAT data needed */
if (BATUpdateBufferAddress < (uint8 *)hVHD->BAT) {
BATUpdateBufferAddress = (uint8 *)hVHD->BAT;
BATUpdateBufferSize = (((((size_t)&hVHD->BAT[BlockNumber+1]) - (size_t)hVHD->BAT) + 511)/512)*512;
BATUpdateBufferSize = (uint32)((((size_t)&hVHD->BAT[BlockNumber]) - (size_t)hVHD->BAT) + 512) & ~511;
BATUpdateStorageAddress = NtoHll(hVHD->Dynamic.TableOffset);
}
else {
BATUpdateBufferSize = VHD_DATA_BLOCK_ALIGNMENT;
BATUpdateStorageAddress = NtoHll(hVHD->Dynamic.TableOffset) + BATUpdateBufferAddress - ((uint8 *)hVHD->BAT);
}
/* If the total BAT is smaller than one VHD_DATA_BLOCK_ALIGNMENT, then be sure to only write out the BAT data */
if ((size_t)(BATUpdateBufferAddress - (uint8 *)hVHD->BAT + BATUpdateBufferSize) > 512*((sizeof(*hVHD->BAT)*NtoHl(hVHD->Dynamic.MaxTableEntries) + 511)/512))
BATUpdateBufferSize = 512*((sizeof(*hVHD->BAT)*NtoHl(hVHD->Dynamic.MaxTableEntries) + 511)/512) - (BATUpdateBufferAddress - ((uint8 *)hVHD->BAT));
BATUpdateBufferSize = (uint32)(512*((sizeof(*hVHD->BAT)*NtoHl(hVHD->Dynamic.MaxTableEntries) + 511)/512) - (BATUpdateBufferAddress - ((uint8 *)hVHD->BAT)));
if (WriteFilePosition(hVHD->File,
BATUpdateBufferAddress,
BATUpdateBufferSize,