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Signed-off-by: John Garry Reviewed-by: Hannes Reinecke --- drivers/scsi/scsi_alua.c | 53 ++++++++++++++++++++++++++++++++++++++++ include/scsi/scsi_alua.h | 6 +++++ 2 files changed, 59 insertions(+) diff --git a/drivers/scsi/scsi_alua.c b/drivers/scsi/scsi_alua.c index 4e20a537a4ad6..9c317e60d031e 100644 --- a/drivers/scsi/scsi_alua.c +++ b/drivers/scsi/scsi_alua.c @@ -128,6 +128,59 @@ static int submit_stpg(struct scsi_device *sdev, ALUA_FAILOVER_RETRIES, &exec_args); } =20 +/* + * scsi_alua_check_tpgs - Evaluate TPGS setting + * @sdev: device to be checked + * + * Examine the TPGS setting of the sdev to find out if ALUA + * is supported. + */ +int scsi_alua_check_tpgs(struct scsi_device *sdev) +{ + int tpgs =3D TPGS_MODE_NONE; + + /* + * ALUA support for non-disk devices is fraught with + * difficulties, so disable it for now. + */ + if (sdev->type !=3D TYPE_DISK) { + sdev_printk(KERN_INFO, sdev, + "%s: disable for non-disk devices\n", + DRV_NAME); + return tpgs; + } + + tpgs =3D scsi_device_tpgs(sdev); + switch (tpgs) { + case TPGS_MODE_EXPLICIT|TPGS_MODE_IMPLICIT: + sdev_printk(KERN_INFO, sdev, + "%s: supports implicit and explicit TPGS\n", + DRV_NAME); + break; + case TPGS_MODE_EXPLICIT: + sdev_printk(KERN_INFO, sdev, "%s: supports explicit TPGS\n", + DRV_NAME); + break; + case TPGS_MODE_IMPLICIT: + sdev_printk(KERN_INFO, sdev, "%s: supports implicit TPGS\n", + DRV_NAME); + break; + case TPGS_MODE_NONE: + sdev_printk(KERN_INFO, sdev, "%s: not supported\n", + DRV_NAME); + break; + default: + sdev_printk(KERN_INFO, sdev, + "%s: unsupported TPGS setting %d\n", + DRV_NAME, tpgs); + tpgs =3D TPGS_MODE_NONE; + break; + } + + return tpgs; +} +EXPORT_SYMBOL_GPL(scsi_alua_check_tpgs); + static char print_alua_state(unsigned char state) { switch (state) { diff --git a/include/scsi/scsi_alua.h b/include/scsi/scsi_alua.h index 6e4f262bbfbc0..2e664f20d9681 100644 --- a/include/scsi/scsi_alua.h +++ b/include/scsi/scsi_alua.h @@ -30,6 +30,8 @@ struct alua_data { int scsi_alua_sdev_init(struct scsi_device *sdev); void scsi_alua_sdev_exit(struct scsi_device *sdev); =20 +int scsi_alua_check_tpgs(struct scsi_device *sdev); + int scsi_alua_rtpg_run(struct scsi_device *sdev); int scsi_alua_stpg_run(struct scsi_device *sdev, bool optimize); =20 @@ -37,6 +39,10 @@ int scsi_alua_init(void); void scsi_exit_alua(void); #else //CONFIG_SCSI_ALUA =20 +static inline int scsi_alua_check_tpgs(struct scsi_device *sdev) +{ + return 0; +} static inline int scsi_alua_rtpg_run(struct scsi_device *sdev) { return 0; --=20 2.43.5