On Tue, 13 Jul 2021 19:50:21 +0200, Bodo Stroesser wrote:
> When running command pipelining for WRITE direction commands,
> (e.g. tape device write) userspace sends cmd completion to cmd
> ring before processing write data. In that case userspace has to
> copy data before sending completion, because cmd completion also
> implicitly releases the data buffer in data area.
>
> The new feature KEEP_BUF allows userspace to optionally keep the
> buffer after completion by setting new bit TCMU_UFLAG_KEEP_BUF in
> tcmu_cmd_entry_hdr->uflags. In that case buffer has to be released
> explicitly by writing the cmd_id to new action item free_kept_buf.
>
> [...]
Applied to 5.15/scsi-queue, thanks!
[1/1] scsi: target: tcmu: Add new feature KEEP_BUF
https://git.kernel.org/mkp/scsi/c/018c14911dd7
--
Martin K. Petersen Oracle Linux Engineering
