Kenneth D. Merry
36d0fa44e2
name and unit number in camcontrol(8). Previously camcontrol(8) only supported rescanning or resetting devices specified by bus:target:lun. This is because for rescanning at least, you don't have a peripheral name and unit number (e.g. da4) for devices that don't exist yet. That is still the case after this change, but in other cases, when the device does exist in the CAM EDT (Existing Device Table), we do a careful lookup of the bus/target/lun if the user supplies a peripheral name and unit number to find the bus:target:lun and then issue the requested reset or rescan. The lookup is done without actually opening the device in question, since a rescan is often done to make a device go away after it has been pulled. (This is especially true for busses/controllers, like parallel SCSI controllers, that don't automatically detect changes in topology.) Opening a device that is no longer there to determine the bus/target/lun might result in error recovery actions when the user really just wanted to make the device go away. sbin/camcontrol/camcontrol.c: In dorescan_or_reset(), if the use hasn't specified a numeric argument, assume he has specified a device. Lookup the pass(4) instance for that device using the transport layer CAMGETPASSTHRU ioctl. If that is successful, we can use the returned bus:target:lun to rescan or reset the device. Under the hood, resetting a device using XPT_RESET_DEV is actually sent via the pass(4) device anyway. But this provides a way for the user to specify devices in a more convenient way, and can work on device rescans when the device is going away, assuming it still exists in the EDT. sbin/camcontrol/camcontrol.8: Update the man page for the rescan and reset subcommands to reflect that you can now use a device name and unit number with them. Sponsored by: Spectra Logic MFC after: 3 days
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