On Wed, Feb 25, 2026 at 03:36:13PM +0000, John Garry wrote:
> Add scsi_mpath_{start,end}_request() to handle updating private multipath
> request data, like nvme_mpath_{start,end}_request().
>
> Since we may need to update mpath_disk data, add a callbacks in
> scsi_driver to actually do this work for the scsi driver.
>
> Signed-off-by: John Garry <[email protected]>
> ---
> drivers/scsi/scsi_lib.c | 4 ++++
> include/scsi/scsi_driver.h | 2 ++
> include/scsi/scsi_multipath.h | 24 ++++++++++++++++++++++++
> 3 files changed, 30 insertions(+)
>
> #ifdef CONFIG_SCSI_MULTIPATH
> + void (*mpath_start_cmd)(struct scsi_cmnd *);
> + void (*mpath_end_cmd)(struct scsi_cmnd *);
> struct mpath_disk *(*to_mpath_disk)(struct request *);
> #endif
> };
> diff --git a/include/scsi/scsi_multipath.h b/include/scsi/scsi_multipath.h
> index 07db217edb085..6cb3107260952 100644
> --- a/include/scsi/scsi_multipath.h
> +++ b/include/scsi/scsi_multipath.h
> @@ -56,6 +56,23 @@ void scsi_mpath_add_sysfs_link(struct scsi_device *sdev);
> void scsi_mpath_remove_sysfs_link(struct scsi_device *sdev);
> int scsi_mpath_get_head(struct scsi_mpath_head *);
> void scsi_mpath_put_head(struct scsi_mpath_head *);
> +
> +static inline void scsi_mpath_start_request(struct request *req)
> +{
> + struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req);
> +
> + if (is_mpath_request(req))
> + scsi_cmd_to_driver(cmd)->mpath_start_cmd(cmd);
> +}
> +
> +static inline void scsi_mpath_end_request(struct request *req)
> +{
> + struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req);
> +
> + if (is_mpath_request(req))
> + scsi_cmd_to_driver(cmd)->mpath_start_cmd(cmd);
Copy-paste error. It should be:
scsi_cmd_to_driver(cmd)->mpath_end_cmd(cmd);
-Ben
