Function Ext2AddMcbExtent

Ext4Fsd/memory.c:787–843

BOOLEAN
Ext2AddMcbExtent (
    IN PEXT2_VCB Vcb,
    IN PEXT2_MCB Mcb,
    IN LONGLONG  Vbn,
    IN LONGLONG  Lbn,
    IN LONGLONG  Length
)
{
    ULONG       TriedTimes = 0;
    LONGLONG    Base = 0;
    UCHAR       Bits = 0;
    BOOLEAN     rc = FALSE;

    Base = (LONGLONG)BLOCK_SIZE;
    Bits = (UCHAR)BLOCK_BITS;

    ASSERT ((Vbn & (Base - 1)) == 0);
    ASSERT ((Lbn & (Base - 1)) == 0);
    ASSERT ((Length & (Base - 1)) == 0);

    Vbn = (Vbn >> Bits) + 1;
    Lbn =  (Lbn >> Bits) + 1;
    Length = (Length >> Bits);

Again:

    __try {

        rc = FsRtlAddLargeMcbEntry(
            &Mcb->Extents,
            Vbn,
            Lbn,
            Length
        );

    } __except (EXCEPTION_EXECUTE_HANDLER) {

        DbgBreak();
        rc = FALSE;
    }

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

    DEBUG(DL_EXT, ("Ext2AddMcbExtent: Vbn=%I64xh Lbn=%I64xh Length=%I64xh,"
                   " rc=%d Runs=%u\n", Vbn, Lbn, Length, rc,
                   FsRtlNumberOfRunsInLargeMcb(&Mcb->Extents)));

    if (rc) {
        Ext2CheckExtent(&Mcb->Extents, Vbn, Lbn, Length, TRUE);
    }

    return rc;
}