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a=xqWC_Br6kY4A:10 a=HzLeVaNsDn8A:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=yPCof4ZbAAAA:8 a=CHiAKCXa_bqUvZA3_qwA:9 X-Proofpoint-GUID: 1dHNo4Z_7iOOe1y20_OyfyRrg4p90hTD X-Proofpoint-ORIG-GUID: 1dHNo4Z_7iOOe1y20_OyfyRrg4p90hTD X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI1MDE0OSBTYWx0ZWRfX8Pngb3Se+3f6 kmbbLx6q/wk/jeUqj/V2qRaORMXHq7vsaUHnvJt9g/cbtDUUzzmARfPL4DAeqOjc2AYsIsqEg/S 4y2/13yMZkuMDFevE+IMGIFzlUb6DA1PvGmQfAJvu6+XtoceW4H3nA0t6K3s32srCYapu+rnBc6 MVuzz++YOzOX2GzSgmwzNvGfsfMd9ZMjbfbuFo1bwkDP+tI5W49Jj0jM0BRtOwH0YsUJQmjP/q0 VJYO6hnw2Zne4hi2VOw6QH1tjLy5i2kkmOld5Ro4EafDbZFs4qapdQ6/7Zu5fmZoX/m+axOZ8tj RXP9WbEpfhy6unjKhsHqh3X4U2nFB/uCAKq+devk7crQqaDPcbgzZNATRSHVt1Db2qB5jf3KY6j oM+NCbQLzFr3DCMRScpcr9n1uTY/uUBnQm1ZgoPWt7wB2zeLATb5ZB4VYoFgKkzQAaOM1cRtjpj sJqqMQpb9oKPJMpXpig== Content-Type: text/plain; charset="utf-8" Add a mpath_dev file so that the multipath disk can be looked up from per-path gendisk directory. The following is an example of this usage: $ ls -l /dev/sdc brw-rw---- 1 root disk 8, 32 Feb 24 16:08 /dev/sdc $ cat /sys/class/scsi_mpath_disk/0/sdc/multipath/sdc:0/mpath_dev 8:32 This can be used by a util like lsscsi, which would find that the gendisk for the per-path scsi_device is missing. Signed-off-by: John Garry --- drivers/scsi/sd.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 48 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 409c0937764d9..f5922a9fe6c1b 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -4198,6 +4198,51 @@ static int sd_mpath_revalidate_head(struct scsi_disk= *sdkp) =20 return ret; } + +static ssize_t sd_mpath_dev_show(struct device *dev, + struct device_attribute *attr, char *page) +{ + struct gendisk *gd =3D dev_to_disk(dev); + struct scsi_disk *sdkp =3D gd->private_data; + struct sd_mpath_disk *sd_mpath_disk =3D sdkp->sd_mpath_disk; + struct mpath_disk *mpath_disk =3D sd_mpath_disk->mpath_disk; + struct gendisk *disk =3D mpath_disk->disk; + struct device *disk_dev =3D disk_to_dev(disk); + + return print_dev_t(page, disk_dev->devt); +} +static DEVICE_ATTR(mpath_dev, 0444, sd_mpath_dev_show, NULL); + +static struct attribute *sd_mpath_dev_attrs[] =3D { + &dev_attr_mpath_dev.attr, + NULL +}; + +static umode_t sd_mpath_dev_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int i) +{ + struct device *dev =3D kobj_to_dev(kobj); + struct gendisk *gd =3D dev_to_disk(dev); + struct scsi_disk *sdkp =3D gd->private_data; + struct scsi_device *sdev =3D sdkp->device; + struct scsi_mpath_device *scsi_mpath_device =3D sdev->scsi_mpath_dev; + + if (!scsi_mpath_device) + return 0; + + return attr->mode; +} + +static const struct attribute_group sd_mpath_dev_attr_group =3D { + .is_visible =3D sd_mpath_dev_attr_is_visible, + .attrs =3D sd_mpath_dev_attrs, +}; + +static const struct attribute_group *sd_mpath_dev_groups[] =3D { + &sd_mpath_dev_attr_group, + NULL +}; + static int sd_mpath_get_disk(struct sd_mpath_disk *sd_mpath_disk) { if (!get_device(&sd_mpath_disk->dev)) @@ -4461,6 +4506,8 @@ static int sd_mpath_revalidate_head(struct scsi_disk = *sdkp) static void sd_mpath_add_disk(struct scsi_disk *sdkp) { } + +#define sd_mpath_dev_groups NULL #endif /** * sd_probe - called during driver initialization and whenever a @@ -4602,7 +4649,7 @@ static int sd_probe(struct device *dev) sdp->host->rpm_autosuspend_delay); } =20 - error =3D device_add_disk(dev, gd, NULL); + error =3D device_add_disk(dev, gd, sd_mpath_dev_groups); if (error) { sd_mpath_fail_probe(sdkp); device_unregister(&sdkp->disk_dev); --=20 2.43.5