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是scsi 的核心模块,即所谓的scsi core.那么scsi host 呢?host 同样也有一个模块,这就得看你具体用的是什么host 了,行话管这个叫HBA,即host bus adapter.而相应的驱动程序就叫Host Bus Adapter driver 了.正如在usb 系统中,所有的总线上的活动都是以host 为主的,而scsi 也是如此,所有的设备也都是围着host 转.即使地球不自转了,设备仍然要围着host 转.不过你会很奇怪,即使你的机器里没有一个叫做HBA 的冬冬,可是你的U 盘还是能用啊,这是怎么回事?没错,怪事年年有,今年特别多,Linux 内核代码虽然繁华美丽,对我们来说,却常是朦胧不真实.设计者们是如何处理usb-storage 和scsi 的接口的呢?他们用代码虚拟了一个scsi host.所以,如果你用cat /proc/scsi/scsi 命令,就可以看看scsi 设备中U 盘是怎么被描述的. 下面是没有插U 盘的一个例子: localhost:~ # cat /proc/scsi/scsi Attached devices: Host: scsi0 Channel: 00 Id: 08 Lun: 00 Vendor: DP Model: BACKPLANE Rev: 1.00 Type: Enclosure ANSI SCSI revision: 05 Host: scsi0 Channel: 02 Id: 00 Lun: 00 Vendor: DELL Model: PERC 5/i Rev: 1.00 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Enclosure ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 00 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 01 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 02 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 03 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 04 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 05 Vendor: SUN Model: StorEdge 3510 Rev: 415F 91 Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 06 Vendor: SUN Model: StorEdge 3510 Rev: 415F
Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 07 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 而下面第二条是机器里有U 盘的情况: localhost:~ # cat /proc/scsi/scsi Attached devices: Host: scsi0 Channel: 00 Id: 08 Lun: 00 Vendor: DP Model: BACKPLANE Rev: 1.00 Type: Enclosure ANSI SCSI revision: 05 Host: scsi0 Channel: 02 Id: 00 Lun: 00 Vendor: DELL Model: PERC 5/i Rev: 1.00 Type: Direct-Access ANSI SCSI revision: 05 Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Enclosure ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 00 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 01 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 02 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 03 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 04 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 05 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 06 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 07 Vendor: SUN Model: StorEdge 3510 Rev: 415F Type: Direct-Access ANSI SCSI revision: 03 92 Host: scsi3 Channel: 00 Id: 00 Lun: 00 Vendor: Leidisk Model: USB Flash Drive Rev: Type: Direct-Access ANSI SCSI revision: 02
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摘要 ............................
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迷雾重重的Bulk 传输(二)....
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引子也许是在复旦养成了
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usb.h datafab.h dpcm.h initializers
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的Linux 内核划分为许许多
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目录下执行make 了.Ok,make 之
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只是一个usb 接口.这些口
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中也定义了这么一些数据
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511 * @driver: the driver model cor
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233 .owner = THIS_MODULE, 234 .name
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91 * construct these entries. Each
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324 struct usb_host_config *actconf
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22 88 * @class_dev: driver model's
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必须给各个地方取名,完了
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26 136 trans_cmnd transport; /* tra
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944 init_MUTEX_LOCKED(&(us->sema));
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147 #if !defined(CONFIG_BLK_DEV_UB)
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124 #define USB_DEVICE_ID_MATCH_DEV
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intf 来代替. us 之所以重要,
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睡眠,那就得用GPF_ATOMIC,这
Page 41 and 42: 504 if (msg >= 0 && !(unusual_dev->
Page 43 and 44: 179 } 180 181 static struct us_unus
Page 45 and 46: 711 /* Submitted by Hartmut Wahl */
Page 47 and 48: 3. useProtocol 为US_SC_DEVICE, use
Page 49 and 50: Bus 004 Device 001: ID 0000:0000 Bu
Page 51 and 52: 993 result = get_pipes(us); 994 if
Page 53 and 54: 631 us->transport_reset = usb_stor_
Page 55 and 56: 659 us->max_lun = 0; 660 break; 661
Page 57 and 58: 740 /* Calculate and store the pipe
Page 59 and 60: storage 会有两个bulk 端点,用
Page 61 and 62: 比如说,复旦大学,有一个主
Page 63 and 64: 1079 #define PIPE_ISOCHRONOUS 0 108
Page 65 and 66: 782 us->unusual_dev->initFunction(u
Page 67 and 68: 630 * each frame is in the fields o
Page 69 and 70: 716 * Bulk URBs may 717 * use the U
Page 71 and 72: 802 int number_of_packets; /* (in)
Page 73 and 74: 先说互斥锁.它诞生于这样
Page 75 and 76: 920 US_DEBUGP("GetMaxLUN command re
Page 77 and 78: 148 /* set up data structures for t
Page 79 and 80: 90 * @wValue: matches the USB wValu
Page 81 and 82: 830 void *transfer_buffer, 831 int
Page 83 and 84: 25 { 26 x->done = 0; 27 init_waitqu
Page 85 and 86: 都会过期,我开始怀疑,在这
Page 87 and 88: 是实际长度,要么就是不成
Page 89 and 90: 87 258 行,usb_pipeendpoint,定义
Page 91: 对爱你的人掘了一条无法
Page 95 and 96: 416 /* 417 * this defines our host
Page 97 and 98: 69 * Ioctl interface 70 * 71 * Stat
Page 99 and 100: 155 * "is this a new device" checks
Page 101 and 102: 241 char *proc_name; 242 243 /* 244
Page 103 and 104: 328 * True if the low-level driver
Page 105 and 106: 可以看到这个函数的参数
Page 107 and 108: 451 short unsigned int max_sectors;
Page 109 and 110: 地说明了为啥咱们要显式
Page 111 and 112: usb_stor_acquire_resources()函数
Page 113 and 114: 341 } 342 343 /* reject if target !
Page 115 and 116: 内核的核心位置,kernel/exit.c
Page 117 and 118: 1023 dissociate_dev(us); 1024 retur
Page 119 and 120: 917 行,再次判断设备有没有
Page 121 and 122: 181 182 /* fail the command if we a
Page 123 and 124: 83 struct timer_list eh_timeout; /*
Page 125 and 126: 123 两个scsi_done,一个是struct
Page 127 and 128: 56 jiffie count on our counter, the
Page 129 and 130: 中看到如下的定义: UNUSUAL_
Page 131 and 132: 269 memcpy(data+16, us->unusual_dev
Page 133 and 134: 一切准备好了之后,我们就
Page 135 and 136: 238 (sg->offset + *offset) & (PAGE_
Page 137 and 138: 所以对于那些不能相应INQUI
Page 139 and 140: 239 行对unsigned int sglen 赋值
Page 141 and 142: 请求,所以这里就判断abort
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112 case GPCMD_READ_HEADER: what =
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到北京,每每只有在夜深人
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580 /* 581 * If we have a failure,
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666 memcpy(srb->cmnd, old_cmnd, MAX
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950 struct bulk_cb_wrap *bcb = (str
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1034 /* get the status again */ 103
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426 /* store the actual length of t
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后她会给host 返回一个CSW.CB
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296 } 297 298 US_DEBUGP("-- transfe
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491 * scatter-gather or not, and ac
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迷雾重重的 Bulk 传输(五) us
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然后把她赋给了result.而us->
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而bcs->Status,标志命令执行
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就必须设置US_FL_IGNORE_RESIDUE
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485 }; 486 这是一个字符数组
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srb->sense_buffer 里边的东西.S
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一个类似的函数,名叫usb_sto
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这种命令应该由mid level 来
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Disk /dev/sda: 146.1 GB, 1461631057
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through to the most significant bit
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1192 USB_TYPE_CLASS | USB_RECIP_INT
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315 行,scsi_report_device_reset(),
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285 US_DEBUGP("No reset during disc
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229 /* Wait for the aborted command
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两个函数中需要判断它,一
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associate_dev()相对应.我们来
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束for 死循环,从而usb_stor_con
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317 for (i = 1; i < us->host->max_i
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