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| author | Muneendra Kumar <muneendra.kumar@broadcom.com> | 2022-05-19 14:31:07 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2022-05-20 02:24:56 +0200 |
| commit | 827fc630e4c8087df5a8e8ee013b686bd6f13736 (patch) | |
| tree | f3215984645fec7361d8befb8aabbe4e6fe05ac4 /drivers/nvme/host | |
| parent | scsi: target: tcmu: Avoid holding XArray lock when calling lock_page (diff) | |
| download | linux-827fc630e4c8087df5a8e8ee013b686bd6f13736.tar.xz linux-827fc630e4c8087df5a8e8ee013b686bd6f13736.zip | |
scsi: nvme-fc: Add new routine nvme_fc_io_getuuid()
Add nvme_fc_io_getuuid() to the nvme-fc transport. The routine is invoked
by the FC LLDD on a per-I/O request basis. The routine translates from the
FC-specific request structure to the bio and the cgroup structure in order
to obtain the FC appid stored in the cgroup structure. If a value is not
set or a bio is not found, a NULL appid (aka uuid) will be returned to the
LLDD.
Link: https://lore.kernel.org/r/20220519123110.17361-2-jsmart2021@gmail.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Muneendra Kumar <muneendra.kumar@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/nvme/host')
| -rw-r--r-- | drivers/nvme/host/fc.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c index 080f85f4105f..05f9da251758 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -1899,6 +1899,24 @@ nvme_fc_ctrl_ioerr_work(struct work_struct *work) nvme_fc_error_recovery(ctrl, "transport detected io error"); } +/* + * nvme_fc_io_getuuid - Routine called to get the appid field + * associated with request by the lldd + * @req:IO request from nvme fc to driver + * Returns: UUID if there is an appid associated with VM or + * NULL if the user/libvirt has not set the appid to VM + */ +char *nvme_fc_io_getuuid(struct nvmefc_fcp_req *req) +{ + struct nvme_fc_fcp_op *op = fcp_req_to_fcp_op(req); + struct request *rq = op->rq; + + if (!IS_ENABLED(CONFIG_BLK_CGROUP_FC_APPID) || !rq->bio) + return NULL; + return blkcg_get_fc_appid(rq->bio); +} +EXPORT_SYMBOL_GPL(nvme_fc_io_getuuid); + static void nvme_fc_fcpio_done(struct nvmefc_fcp_req *req) { |