PtrExt2FileLockInfo NTAPI Ext2AllocateByteLocks ( void )
Definition at line 929 of file misc.c.
{
    PtrExt2FileLockInfo     PtrByteLocks = NULL;
    BOOLEAN                     AllocatedFromZone = TRUE;
   KIRQL                            CurrentIrql;

    // first, try to allocate out of the zone
    KeAcquireSpinLock(&(Ext2GlobalData.ZoneAllocationSpinLock), &CurrentIrql);
    if (!ExIsFullZone(&(Ext2GlobalData.ByteLockZoneHeader))) 
    {
        // we have enough memory
        PtrByteLocks = (PtrExt2FileLockInfo)ExAllocateFromZone(&(Ext2GlobalData.ByteLockZoneHeader));

        // release the spinlock
        KeReleaseSpinLock(&(Ext2GlobalData.ZoneAllocationSpinLock), CurrentIrql);
    } 
    else 
    {
        // release the spinlock
        KeReleaseSpinLock(&(Ext2GlobalData.ZoneAllocationSpinLock), CurrentIrql);

        // if we failed to obtain from the zone, get it directly from the VMM
        PtrByteLocks = (PtrExt2FileLockInfo)Ext2AllocatePool(NonPagedPool, Ext2QuadAlign(sizeof(Ext2FileLockInfo)) );
        AllocatedFromZone = FALSE;
    }

    // if we could not obtain the required memory, bug-check.
    //  Do NOT do this in your commercial driver, instead handle the error gracefully ...
    if (!PtrByteLocks) 
    {
        Ext2Panic(STATUS_INSUFFICIENT_RESOURCES, Ext2QuadAlign(sizeof(Ext2FileLockInfo)), 0);
    }

    // zero out the allocated memory block
    RtlZeroMemory(PtrByteLocks, Ext2QuadAlign(sizeof(PtrExt2FileLockInfo)));

    if (!AllocatedFromZone) 
    {
        Ext2SetFlag(PtrByteLocks->FileLockFlags, EXT2_BYTE_LOCK_NOT_FROM_ZONE);
    }

    return(PtrByteLocks);
}
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