On 2022-11-13 19:30, Damien Le Moal wrote:
On 11/14/22 06:48, Douglas Gilbert wrote:
On 2022-11-09 10:59, Wenchao Hao wrote:
The original error injection mechanism was based on scsi_host which
could not inject fault for a single SCSI device.
This patchset provides the ability to inject errors for a single
SCSI device. Now we supports inject timeout errors, queuecommand
errors, and hostbyte, driverbyte, statusbyte, and sense data for
specific SCSI Command
The first patch add an sysfs interface to add and inquiry single
device's error injection info; the second patch defined how to remove
an injection which has been added. The following 3 patches use the
injection info and generate the related error type.
Wenchao Hao (5):
scsi:scsi_debug: Add sysfs interface to manager single devices' error inject
scsi:scsi_debug: Add interface to remove injection which has been added
scsi:scsi_debug: make command timeout if timeout error is injected
scsi:scsi_debug: Return failed value for specific command's queuecommand
scsi:scsi_debug: fail specific scsi command with result and sense data
drivers/scsi/scsi_debug.c | 295 ++++++++++++++++++++++++++++++++++++++
1 file changed, 295 insertions(+)
Hi,
This patchset seems to assume all scsi_debug devices will be disk (-like) SCSI
devices. That leaves out other device types: tapes, enclosures, WLUNs, etc.
Have you considered putting these device specific additions under:
/sys/class/scsi_device/<hctl>/device/error_inject/
instead of
/sys/block/sdb/device/error_inject/
But these are the same, no ?
At least on my Fedora box, I see:
/sys/block/sdp/device/ being
/sys/devices/pseudo_0/adapter0/host19/target19:0:0/19:0:0:0
and /sys/class/scsi_device/19:0:0:0/device being
/sys/devices/pseudo_0/adapter0/host19/target19:0:0/19:0:0:0
Well the patch descriptions are all in terms of /sys/block/sd<letter>/
which will not exist if scsi_debug is called like this:
$ modprobe scsi_debug ptype=1
That creates a pseudo host with an attached (virtual) tape drive. If
the patchset works for other peripheral device types (i.e. that don't
use the sd driver) then the description should at least mention the
more general case (i.e. /sys/class/scsi_device/<hctl>/device ) IMO.
Doug Gilbert
