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reactos/ntoskrnl/io/iomgr/remlock.c

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/*
* PROJECT: ReactOS Kernel
* LICENSE: GPL - See COPYING in the top level directory
* FILE: ntoskrnl/io/iomgr/remlock.c
* PURPOSE: Remove Lock Support
* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
* Filip Navara (navaraf@reactos.org)
* Pierre Schweitzer (pierre.schweitzer@reactos.org)
*/
/* INCLUDES ******************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
typedef struct _IO_REMOVE_LOCK_TRACKING_BLOCK
{
PIO_REMOVE_LOCK_TRACKING_BLOCK Next;
PVOID Tag;
LARGE_INTEGER LockMoment;
LPCSTR File;
ULONG Line;
} IO_REMOVE_LOCK_TRACKING_BLOCK;
/* FUNCTIONS *****************************************************************/
/*
* @implemented
*/
VOID
NTAPI
IoInitializeRemoveLockEx(IN PIO_REMOVE_LOCK RemoveLock,
IN ULONG AllocateTag,
IN ULONG MaxLockedMinutes,
IN ULONG HighWatermark,
IN ULONG RemlockSize)
{
PEXTENDED_IO_REMOVE_LOCK Lock = (PEXTENDED_IO_REMOVE_LOCK)RemoveLock;
PAGED_CODE();
DPRINT("%s(%p 0x%08x %u %u %u)\n", __FUNCTION__, RemoveLock, AllocateTag, MaxLockedMinutes, HighWatermark, RemlockSize);
ASSERT(HighWatermark < MAXLONG);
/* If no lock given, nothing to do */
if (!Lock)
{
return;
}
switch (RemlockSize)
{
/* Check if this is a debug lock */
case (sizeof(IO_REMOVE_LOCK_DBG_BLOCK) + sizeof(IO_REMOVE_LOCK_COMMON_BLOCK)):
/* Setup debug parameters */
Lock->Dbg.Signature = 'COLR';
Lock->Dbg.HighWatermark = HighWatermark;
Lock->Dbg.MaxLockedTicks = KeQueryTimeIncrement() * MaxLockedMinutes * 600000000;
Lock->Dbg.AllocateTag = AllocateTag;
KeInitializeSpinLock(&(Lock->Dbg.Spin));
Lock->Dbg.LowMemoryCount = 0;
Lock->Dbg.Blocks = NULL;
case sizeof(IO_REMOVE_LOCK_COMMON_BLOCK):
/* Setup a free block */
Lock->Common.Removed = FALSE;
Lock->Common.IoCount = 1;
KeInitializeEvent(&Lock->Common.RemoveEvent,
SynchronizationEvent,
FALSE);
}
}
/*
* @implemented
*/
NTSTATUS
NTAPI
IoAcquireRemoveLockEx(IN PIO_REMOVE_LOCK RemoveLock,
IN OPTIONAL PVOID Tag,
IN LPCSTR File,
IN ULONG Line,
IN ULONG RemlockSize)
{
KIRQL OldIrql;
LONG LockValue;
PIO_REMOVE_LOCK_TRACKING_BLOCK TrackingBlock;
PEXTENDED_IO_REMOVE_LOCK Lock = (PEXTENDED_IO_REMOVE_LOCK)RemoveLock;
DPRINT("%s(%p %p %s %u %u)\n", __FUNCTION__, RemoveLock, Tag, File, Line, RemlockSize);
/* Increase the lock count */
LockValue = InterlockedIncrement(&(Lock->Common.IoCount));
ASSERT(LockValue > 0);
if (!Lock->Common.Removed)
{
/* Check what kind of lock this is */
if (RemlockSize == (sizeof(IO_REMOVE_LOCK_DBG_BLOCK) + sizeof(IO_REMOVE_LOCK_COMMON_BLOCK)))
{
ASSERT(Lock->Dbg.HighWatermark == 0 || LockValue <= Lock->Dbg.HighWatermark);
/* Allocate a tracking block */
TrackingBlock = ExAllocatePoolWithTag(NonPagedPool, sizeof(IO_REMOVE_LOCK_TRACKING_BLOCK), Lock->Dbg.AllocateTag);
if (!TrackingBlock)
{
/* Keep count of failures for lock release and missing tags */
InterlockedIncrement(&(Lock->Dbg.LowMemoryCount));
}
else
{
/* Initialize block */
RtlZeroMemory(TrackingBlock, sizeof(IO_REMOVE_LOCK_TRACKING_BLOCK));
TrackingBlock->Tag = Tag;
TrackingBlock->File = File;
TrackingBlock->Line = Line;
KeQueryTickCount(&(TrackingBlock->LockMoment));
/* Queue the block */
KeAcquireSpinLock(&(Lock->Dbg.Spin), &OldIrql);
TrackingBlock->Next = Lock->Dbg.Blocks;
Lock->Dbg.Blocks = TrackingBlock;
KeReleaseSpinLock(&(Lock->Dbg.Spin), OldIrql);
}
}
}
else
{
/* Otherwise, decrement the count and check if it's gone */
if (!InterlockedDecrement(&(Lock->Common.IoCount)))
{
/* Signal the event */
KeSetEvent(&(Lock->Common.RemoveEvent), IO_NO_INCREMENT, FALSE);
}
/* Return pending delete */
return STATUS_DELETE_PENDING;
}
/* Otherwise, return success */
return STATUS_SUCCESS;
}
/*
* @implemented
*/
VOID
NTAPI
IoReleaseRemoveLockEx(IN PIO_REMOVE_LOCK RemoveLock,
IN PVOID Tag,
IN ULONG RemlockSize)
{
KIRQL OldIrql;
LONG LockValue;
BOOLEAN TagFound;
LARGE_INTEGER CurrentMoment;
PIO_REMOVE_LOCK_TRACKING_BLOCK TrackingBlock;
PIO_REMOVE_LOCK_TRACKING_BLOCK *TrackingBlockLink;
PEXTENDED_IO_REMOVE_LOCK Lock = (PEXTENDED_IO_REMOVE_LOCK)RemoveLock;
DPRINT("%s(%p %p %u)\n", __FUNCTION__, RemoveLock, Tag, RemlockSize);
/* Check what kind of lock this is */
if (RemlockSize == (sizeof(IO_REMOVE_LOCK_DBG_BLOCK) + sizeof(IO_REMOVE_LOCK_COMMON_BLOCK)))
{
/* Acquire blocks queue */
KeAcquireSpinLock(&(Lock->Dbg.Spin), &OldIrql);
/* Get the release moment */
KeQueryTickCount(&CurrentMoment);
/* Start browsing tracking blocks to find a block that would match given tag */
TagFound = FALSE;
TrackingBlock = Lock->Dbg.Blocks;
TrackingBlockLink = &(Lock->Dbg.Blocks);
while (TrackingBlock != NULL)
{
/* First of all, check if the lock was locked for too long */
if (Lock->Dbg.MaxLockedTicks &&
CurrentMoment.QuadPart - TrackingBlock->LockMoment.QuadPart > Lock->Dbg.MaxLockedTicks)
{
DPRINT("Lock %#08lx (with tag %#08lx) was supposed to be held at max %I64d ticks but lasted longer\n",
Lock, TrackingBlock->Tag, Lock->Dbg.MaxLockedTicks);
DPRINT("Lock was acquired in file %s at line %lu\n", TrackingBlock->File, TrackingBlock->Line);
ASSERT(FALSE);
}
/* Check if this is the first matching tracking block */
if ((TagFound == FALSE) && (TrackingBlock->Tag == Tag))
{
/* Unlink this tracking block, and free it */
TagFound = TRUE;
*TrackingBlockLink = TrackingBlock->Next;
ExFreePoolWithTag(TrackingBlock, Lock->Dbg.AllocateTag);
TrackingBlock = *TrackingBlockLink;
}
else
{
/* Go to the next tracking block */
TrackingBlockLink = &(TrackingBlock->Next);
TrackingBlock = TrackingBlock->Next;
}
}
/* We're done, release queue lock */
KeReleaseSpinLock(&(Lock->Dbg.Spin), OldIrql);
/* If we didn't find any matching block */
if (TagFound == FALSE)
{
/* Check if it was because we were low in memory
* If yes, then ignore, that's normal
*/
if (InterlockedDecrement(&(Lock->Dbg.LowMemoryCount)) < 0)
{
/* Otherwise signal the issue, it shouldn't happen */
InterlockedIncrement(&(Lock->Dbg.LowMemoryCount));
DPRINT("Failed finding block for tag: %#08lx\n", Tag);
ASSERT(FALSE);
}
}
}
/* Decrement the lock count */
LockValue = InterlockedDecrement(&(Lock->Common.IoCount));
ASSERT(LockValue >= 0);
if (!LockValue)
{
/* Someone should be waiting... */
ASSERT(Lock->Common.Removed);
/* Signal the event */
KeSetEvent(&(Lock->Common.RemoveEvent), IO_NO_INCREMENT, FALSE);
}
}
/*
* @implemented
*/
VOID
NTAPI
IoReleaseRemoveLockAndWaitEx(IN PIO_REMOVE_LOCK RemoveLock,
IN PVOID Tag,
IN ULONG RemlockSize)
{
LONG LockValue;
PIO_REMOVE_LOCK_TRACKING_BLOCK TrackingBlock;
PEXTENDED_IO_REMOVE_LOCK Lock = (PEXTENDED_IO_REMOVE_LOCK)RemoveLock;
PAGED_CODE();
DPRINT("%s(%p %p %u)\n", __FUNCTION__, RemoveLock, Tag, RemlockSize);
/* Remove the lock and decrement the count */
Lock->Common.Removed = TRUE;
LockValue = InterlockedDecrement(&Lock->Common.IoCount);
ASSERT(LockValue > 0);
/* If we are still > 0, then wait for the others to remove lock */
if (InterlockedDecrement(&Lock->Common.IoCount) > 0)
{
/* Wait for it */
KeWaitForSingleObject(&(Lock->Common.RemoveEvent),
Executive,
KernelMode,
FALSE,
NULL);
}
/* Check what kind of lock this is */
if (RemlockSize == (sizeof(IO_REMOVE_LOCK_DBG_BLOCK) + sizeof(IO_REMOVE_LOCK_COMMON_BLOCK)))
{
/* A block must be remaining */
ASSERT(Lock->Dbg.Blocks);
/* Get it */
TrackingBlock = Lock->Dbg.Blocks;
/* Tag should match */
if (TrackingBlock->Tag != Tag)
{
DPRINT("Last tracking block tag invalid! Expected: %p, having: %p\n", Tag, TrackingBlock->Tag);
ASSERT(TrackingBlock->Tag != Tag);
}
/* Release block */
ExFreePoolWithTag(Lock->Dbg.Blocks, Lock->Dbg.AllocateTag);
}
}
/* EOF */
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