Function Ext2AddVcbExtent

Ext4Fsd/memory.c:645–695

BOOLEAN
Ext2AddVcbExtent (
    IN PEXT2_VCB Vcb,
    IN LONGLONG  Vbn,
    IN LONGLONG  Length
)
{
    ULONG       TriedTimes = 0;

    LONGLONG    Offset = 0;
    BOOLEAN     rc = FALSE;

    Offset = Vbn & (~(Vcb->IoUnitSize - 1));
    Length = (Vbn - Offset + Length + Vcb->IoUnitSize - 1) &
             ~(Vcb->IoUnitSize - 1);

    ASSERT ((Offset & (Vcb->IoUnitSize - 1)) == 0);
    ASSERT ((Length & (Vcb->IoUnitSize - 1)) == 0);

    Offset = (Offset >> Vcb->IoUnitBits) + 1;
    Length = (Length >> Vcb->IoUnitBits);

Again:

    __try {
        rc = FsRtlAddLargeMcbEntry(
                &Vcb->Extents,
                Offset,
                Offset,
                Length
                );
    } __except (EXCEPTION_EXECUTE_HANDLER) {
        DbgBreak();
        rc = FALSE;
    }

    if (!rc && ++TriedTimes < 10) {
        Ext2Sleep(TriedTimes * 100);
        goto Again;
    }

    DEBUG(DL_EXT, ("Ext2AddVcbExtent: Vbn=%I64xh Length=%I64xh,"
                   " rc=%d Runs=%u\n", Offset, Length, rc,
                   FsRtlNumberOfRunsInLargeMcb(&Vcb->Extents)));

    if (rc) {
        Ext2CheckExtent(&Vcb->Extents, Offset, Offset, Length, TRUE);
    }

    return rc;
}

BOOLEAN
Ext2RemoveVcbExtent (