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Commit 8e43e12d authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  xen-blkfront.c: make blkif_ioctl() static
  bio: make use of bvec_nr_vecs
  cciss: fix bug if scsi tape support is disabled
  cciss: add support for multi lun tape devices
  cciss: change the way we notify scsi midlayer of tape drives
  cciss: fix negative logical drive count in procfs
  cciss: remove redundant code
  cciss: make rebuild_lun_table behave better
  cciss: return -EFAULT if copy_from_user() fails
parents 01b09b6c 62aa0054

Documentation/cciss.txt

+6 −15
Original line number Diff line number Diff line
@@ -112,27 +112,18 @@ Hot plug support for SCSI tape drives 


Hot plugging of SCSI tape drives is supported, with some caveats.

The cciss driver must be informed that changes to the SCSI bus

have been made, in addition to and prior to informing the SCSI 

mid layer.  This may be done via the /proc filesystem.  For example:

have been made.  This may be done via the /proc filesystem.

For example:



	echo "rescan" > /proc/scsi/cciss0/1



This causes the adapter to query the adapter about changes to the 

This causes the driver to query the adapter about changes to the

physical SCSI buses and/or fibre channel arbitrated loop and the

driver to make note of any new or removed sequential access devices

or medium changers.  The driver will output messages indicating what 

devices have been added or removed and the controller, bus, target and 

lun used to address the device.  Once this is done, the SCSI mid layer 

can be informed of changes to the virtual SCSI bus which the driver 

presents to it in the usual way. For example: 



	echo scsi add-single-device 3 2 1 0 > /proc/scsi/scsi

 

to add a device on controller 3, bus 2, target 1, lun 0.   Note that

the driver makes an effort to preserve the devices positions

in the virtual SCSI bus, so if you are only moving tape drives 

around on the same adapter and not adding or removing tape drives 

from the adapter, informing the SCSI mid layer may not be necessary.

lun used to address the device.  It then notifies the SCSI mid layer

of these changes.



Note that the naming convention of the /proc filesystem entries 

contains a number in addition to the driver name.  (E.g. "cciss0"