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[FASTFAT] Allow locking system volume on boot.

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This is a hack, and totally not the default behavior.
But it will allow autochk locking the boot volume in
order to verify it on boot, in case it would have
been improperly dismounted.

CORE-13759
This commit is contained in:
Pierre Schweitzer 2018-05-18 22:35:03 +02:00
parent bfb19dd251
commit efa75dd5b2
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1 changed files with 75 additions and 0 deletions
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75
drivers/filesystems/fastfat/fsctl.c
View file

@ -1121,6 +1121,70 @@ VfatLockOrUnlockVolume(
{
PLIST_ENTRY ListEntry;
#if 1
/* FIXME: Hack that allows locking the system volume on
* boot so that autochk can run properly
* That hack is, on purpose, really restrictive
* it will only allow locking with two directories
* open: current directory of smss and autochk.
*/
BOOLEAN ForceLock = TRUE;
ULONG HandleCount = 0;
/* Only allow boot volume */
if (BooleanFlagOn(DeviceExt->Flags, VCB_IS_SYS_OR_HAS_PAGE))
{
/* We'll browse all the FCB */
ListEntry = DeviceExt->FcbListHead.Flink;
while (ListEntry != &DeviceExt->FcbListHead)
{
Fcb = CONTAINING_RECORD(ListEntry, VFATFCB, FcbListEntry);
ListEntry = ListEntry->Flink;
/* If no handle: that FCB is no problem for locking
* so ignore it
*/
if (Fcb->OpenHandleCount == 0)
{
continue;
}
/* Not a dir? We're no longer at boot */
if (!vfatFCBIsDirectory(Fcb))
{
ForceLock = FALSE;
break;
}
/* If we have cached initialized and several handles, we're
not in the boot case
*/
if (Fcb->FileObject != NULL && Fcb->OpenHandleCount > 1)
{
ForceLock = FALSE;
break;
}
/* Count the handles */
HandleCount += Fcb->OpenHandleCount;
/* More than two handles? Then, we're not booting anymore */
if (HandleCount > 2)
{
ForceLock = FALSE;
break;
}
}
}
else
{
ForceLock = FALSE;
}
/* Here comes the hack, ignore the failure! */
if (!ForceLock)
{
#endif
DPRINT1("Can't lock: %u opened\n", DeviceExt->OpenHandleCount);
ListEntry = DeviceExt->FcbListHead.Flink;
@ -1136,6 +1200,17 @@ VfatLockOrUnlockVolume(
}
return STATUS_ACCESS_DENIED;
#if 1
/* End of the hack: be verbose about its usage,
* just in case we would mess up everything!
*/
}
else
{
DPRINT1("HACK: Using lock-hack!\n");
}
#endif
}
/* Finally, proceed */