SCSI学习

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upper lever driver : sd sr st sg 抽象的硬盘，磁带等节点，sd的驱动程序注册；

middle lever driver:scsi core：提供API给上层和下层，第一优先级加载；

lower lever：HBAS 具体控制器的驱动程序，控制器注册并探测到设备，注册设备

lower lever三部曲：

第一步    scsi_host_alloc        =>shost->ehandler = kthread_run(scsi_error_handler, shost, "scsi_eh_%d", shost->host_no);第二步    scsi_add_host //注册host第三步    scsi_scan_host //扫描并注册节点        =>do_scsi_scan_host(shost);            =>scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, SCAN_WILD_CARD, 0);                =>scsi_scan_channel(shost, channel, id, lun, rescan);                    =>__scsi_scan_target(&shost->shost_gendev, channel, order_id, lun, rescan);                        =>scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);                            =>res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);                                =>scsi_sysfs_add_sdev(sdev) //scsi_sysfs_add_sdev - add scsi device to  sysfs 注册scsi device

sd_rw_intr //potentially run from within an ISR. Must not block.  SCpnt->done = sd_rw_intr;    =>scsi_io_completion(SCpnt, good_bytes);        =>error = -EIO

linux 文件写入流程（从vfs层，通用block层到 scsi磁盘驱动
http://blog.chinaunix.net/uid-28792672-id-3984577.html

scsi总线驱动的初始化
http://blog.csdn.net/yunsongice/article/details/6171286
作者的疯狂内核系列有机会好好学习一下

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