I'm seeing a problem which I think is a problem in the SCSI mid layer. Check this out: I can rmmod and insmod hpsa (a modified version from what's currently in the mainline tree, but I don't think that matters.) I have one logical drive present [root@slicer ~]# rmmod hpsa [root@slicer ~]# insmod /usr/src/linux-2.6.27.42/drivers/scsi/hpsa.ko [root@slicer ~]# cat /proc/scsi/scsi Attached devices: Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: HP Model: 1210m Rev: 0150 Type: RAID ANSI SCSI revision: 05 Host: scsi1 Channel: 00 Id: 00 Lun: 01 Vendor: HP Model: 1210m VOLUME Rev: 0150 Type: Direct-Access ANSI SCSI revision: 05 [root@slicer ~]# rmmod hpsa [root@slicer ~]# insmod /usr/src/linux-2.6.27.42/drivers/scsi/hpsa.ko [root@slicer ~]# cat /proc/scsi/scsi Attached devices: Host: scsi2 Channel: 00 Id: 00 Lun: 00 Vendor: HP Model: 1210m Rev: 0150 Type: RAID ANSI SCSI revision: 05 Host: scsi2 Channel: 00 Id: 00 Lun: 01 Vendor: HP Model: 1210m VOLUME Rev: 0150 Type: Direct-Access ANSI SCSI revision: 05 [root@slicer ~]# lsscsi -g [2:0:0:0] storage HP 1210m 0150 - /dev/sg0 [2:0:0:1] disk HP 1210m VOLUME 0150 /dev/sda /dev/sg1 So far, so good. Now, watch this. Remove the device while something has it open: [root@slicer ~]# sleep 10 < /dev/sg1 & ( sleep 1 && echo scsi remove-single-device 2 0 0 1 > /proc/scsi/scsi ) [1] 6077 [root@slicer ~]# [1]+ Done sleep 10 < /dev/sg1 [root@slicer ~]# lsof /dev/sg1 lsof: status error on /dev/sg1: No such file or directory lsof 4.78 latest revision: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/ latest FAQ: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/FAQ latest man page: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_man usage: [-?abhlnNoOPRstUvVX] [+|-c c] [+|-d s] [+D D] [+|-f] [-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+m [m]] [+|-M] [-o [o]] [-p s] [+|-r [t]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [-Z [Z]] [--] [names] Use the ``-h'' option to get more help information. [root@slicer ~]# rmmod hpsa ERROR: Module hpsa is in use [root@slicer ~]# Hmm, that's not cool. Maybe it's my driver. Let me try with USB. [root@slicer ~]# cat /proc/scsi/scsi Attached devices: Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: USB Model: DISK 2.0 Rev: 0403 Type: Direct-Access ANSI SCSI revision: 00 [root@slicer ~]# lsmod | grep sd sd_mod 59592 0 scsi_mod 189304 9 usb_storage,ib_iser,iscsi_tcp,libiscsi,scsi_transport_iscsi,scsi_dh,sg,cciss,sd_mod [root@slicer ~]# rmmod usb_storage [root@slicer ~]# cat /proc/scsi/scsi Attached devices: [root@slicer ~]# modprobe usb_storage [root@slicer ~]# cat /proc/scsi/scsi Attached devices: [root@slicer ~]# echo scsi add-single-device 1 0 0 0 > /proc/scsi/scsi -bash: echo: write error: No such device or address Oh yeah, the host number increments, forgot about that... [root@slicer ~]# echo scsi add-single-device 2 0 0 0 > /proc/scsi/scsi [root@slicer ~]# cat /proc/scsi/scsi Attached devices: Host: scsi2 Channel: 00 Id: 00 Lun: 00 Vendor: USB Model: DISK 2.0 Rev: 0403 Type: Direct-Access ANSI SCSI revision: 00 [root@slicer ~]# lsscsi -g [2:0:0:0] disk USB DISK 2.0 0403 /dev/sda /dev/sg0 [root@slicer ~]# sleep 10 < /dev/sg0 & ( sleep 1 && echo scsi remove-single-device 2 0 0 0 > /proc/scsi/scsi ) [1] 6073 [root@slicer ~]# [root@slicer ~]# [1]+ Done sleep 10 < /dev/sg0 [root@slicer ~]# rmmod usb_storage ERROR: Module usb_storage is in use [root@slicer ~]# Hmm, same thing. Any thoughts? (other than "don't do that." Our array configuration utility for smart arrays is causing similar trouble, as it rapidly creates and deletes logical drives, etc. so it would be nice if this didn't happen.) -- steve -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
