Function Ext2DropBH

Ext4Fsd/ext3/generic.c:262–296

}

VOID
Ext2DropBH(IN PEXT2_VCB Vcb)
{
    struct ext4_sb_info *sbi = &Vcb->sbi;

    /* do nothing if Vcb is not initialized yet */
    if (!IsFlagOn(Vcb->Flags, VCB_INITIALIZED))
        return;

    __try {

        /* acquire bd lock to avoid bh creation */
        ExAcquireResourceExclusiveLite(&Vcb->bd.bd_bh_lock, TRUE);

        SetFlag(Vcb->Flags, VCB_BEING_DROPPED);
        Ext2DropGroupBH(Vcb);

        while (!IsListEmpty(&Vcb->bd.bd_bh_free)) {
            struct buffer_head *bh;
            PLIST_ENTRY         l;
            l = RemoveHeadList(&Vcb->bd.bd_bh_free);
            bh = CONTAINING_RECORD(l, struct buffer_head, b_link);
            InitializeListHead(&bh->b_link);
            if (0 == atomic_read(&bh->b_count)) {
                buffer_head_remove(&Vcb->bd, bh);
                free_buffer_head(bh);
            }
        }

    } __finally {
        ExReleaseResourceLite(&Vcb->bd.bd_bh_lock);
    }

    ClearFlag(Vcb->Flags, VCB_BEING_DROPPED);
}


VOID