While testing the WRITE SCATTERED command support in a new sg3_utils
utility (sg_write_x) it was helpful to have a target that supported
this command. This command might be attractive to other kernel
subsystems. Even if end devices don't support this command yet, it
would most likely be a performance win if SCSI LLDs supported it (by
breaking it down to a series of WRITE commands), as that would cut
down the overhead of the block layer, the ULD (e.g. sd) and the SCSI
midlevel.
Changes since v2:
- remove over-zealous sanity check (lbdof >= bt_len) that rejected
valid invocations
- change a kzalloc() failure to return SCSI_MLQUEUE_HOST_BUSY as
requested by reviewer
Changes since original version:
- fix problem when fake_rw=1, identify media access commands
better with following rename
- rename FF_DIRECT_IO to FF_MEDIA_IO
- apply reviewer suggestions (Bart Van Assche)
- expand in-code comments
Douglas Gilbert (5):
scsi_debug: tab, kstrto changes
scsi_debug: fix group_number mask
scsi_debug: do_device_access add sg offset argument
scsi_debug: ARRAY_SIZE and FF_MEDIA_IO
scsi_debug: add resp_write_scat function
drivers/scsi/scsi_debug.c | 541 +++++++++++++++++++++++++++++++---------------
1 file changed, 366 insertions(+), 175 deletions(-)
--
2.14.1
