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DISK: Fix -O functionality to override VHD differencing disk consistency checks

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This commit is contained in:
Mark Pizzolato 2016-11-26 07:06:19 -08:00
parent 4f1f439174
commit 3511b5e4e3
1 changed files with 32 additions and 4 deletions
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36
sim_disk.c
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@ -2896,7 +2896,10 @@ if ((sDynamic) &&
(sim_switches & SWMASK ('O'))))
strncpy (szParentVHDPath, CheckPath, ParentVHDPathSize);
else {
sim_printf ("Error Invalid Parent VHD '%s' for Differencing VHD: %s\n", CheckPath, szVHDPath);
if (0 != memcmp (sDynamic->ParentUniqueID, sParentFooter.UniqueID, sizeof (sParentFooter.UniqueID)))
sim_printf ("Error Invalid Parent VHD '%s' for Differencing VHD: %s\n", CheckPath, szVHDPath);
else
sim_printf ("Error Parent VHD '%s' has been modified since Differencing VHD: %s was created\n", CheckPath, szVHDPath);
Return = EINVAL; /* File Corrupt/Invalid */
}
break;
@ -3005,6 +3008,7 @@ return (char *)(&hVHD->Footer.DriveType[0]);
static FILE *sim_vhd_disk_open (const char *szVHDPath, const char *DesiredAccess)
{
VHDHANDLE hVHD = (VHDHANDLE) calloc (1, sizeof(*hVHD));
int NeedUpdate = FALSE;
int Status;
if (!hVHD)
@ -3037,9 +3041,21 @@ static FILE *sim_vhd_disk_open (const char *szVHDPath, const char *DesiredAccess
0);
if (Status)
goto Cleanup_Return;
if (ParentModifiedTimeStamp != hVHD->Dynamic.ParentTimeStamp) {
Status = EBADF;
goto Cleanup_Return;
if ((0 != memcmp (hVHD->Dynamic.ParentUniqueID, ParentFooter.UniqueID, sizeof (ParentFooter.UniqueID))) ||
(ParentModifiedTimeStamp != hVHD->Dynamic.ParentTimeStamp)) {
if (sim_switches & SWMASK ('O')) { /* OVERRIDE consistency checks? */
if (strchr (DesiredAccess, '+')) { /* open for write/update? */
memcpy (hVHD->Dynamic.ParentUniqueID, ParentFooter.UniqueID, sizeof (ParentFooter.UniqueID));
hVHD->Dynamic.ParentTimeStamp = ParentModifiedTimeStamp;
hVHD->Dynamic.Checksum = 0;
hVHD->Dynamic.Checksum = CalculateVhdFooterChecksum (&hVHD->Dynamic, sizeof(hVHD->Dynamic));
NeedUpdate = TRUE;
}
}
else {
Status = EBADF;
goto Cleanup_Return;
}
}
}
if (hVHD->Footer.SavedState) {
@ -3056,6 +3072,18 @@ Cleanup_Return:
sim_vhd_disk_close ((FILE *)hVHD);
hVHD = NULL;
}
else {
if (NeedUpdate) { /* Update Differencing Disk Header? */
if (WriteFilePosition(hVHD->File,
&hVHD->Dynamic,
sizeof (hVHD->Dynamic),
NULL,
NtoHll (hVHD->Footer.DataOffset))) {
sim_vhd_disk_close ((FILE *)hVHD);
hVHD = NULL;
}
}
}
errno = Status;
return (FILE *)hVHD;
}