Function bmap

Ext4Fsd/linux.c:924–967

//

ULONGLONG bmap(struct inode *i, ULONGLONG b)
{
    ULONGLONG lcn = 0;
    struct super_block *s = i->i_sb;

    PEXT2_MCB  Mcb = (PEXT2_MCB)i->i_priv;
    PEXT2_VCB  Vcb = (PEXT2_VCB)s->s_priv;
    PEXT2_EXTENT extent = NULL;
    ULONGLONG  offset = (ULONGLONG)b;
    NTSTATUS   status;

    if (!Mcb || !Vcb) {
        goto errorout;
    }

    offset <<= BLOCK_BITS;
    status = Ext2BuildExtents(
                 NULL,
                 Vcb,
                 Mcb,
                 offset,
                 BLOCK_SIZE,
                 FALSE,
                 &extent
             );

    if (!NT_SUCCESS(status)) {
        goto errorout;
    }

    if (extent == NULL) {
        goto errorout;
    }

    lcn = (unsigned long)(extent->Lba >> BLOCK_BITS);

errorout:

    if (extent) {
        Ext2FreeExtent(extent);
    }

    return lcn;
}

void iget(struct inode *inode)
{