Messages in this thread Patch in this message | | | From | Johannes Thumshirn <> | Subject | [PATCH] nvme: also provide a UUID in the WWID sysfs attribute | Date | Wed, 12 Jul 2017 15:38:56 +0200 |
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The WWID sysfs attribute can provide multiple means of a World Wide ID for a NVMe device. It can either be a NGUID, a EUI-64 or a concatenation of VID, Serial Number, Model and the Namespace ID in this order of preference.
If the target also sends us a UUID use the UUID for identification and give it the highest priority.
This eases generation of /dev/disk/by-* symlinks.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> --- drivers/nvme/host/core.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index d70df1d0072d..c100e7db9b54 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1995,6 +1995,9 @@ static ssize_t wwid_show(struct device *dev, struct device_attribute *attr, int serial_len = sizeof(ctrl->serial); int model_len = sizeof(ctrl->model); + if (!uuid_is_null(&ns->uuid)) + return sprintf(buf, "uuid.%pU\n", &ns->uuid); + if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid))) return sprintf(buf, "eui.%16phN\n", ns->nguid); -- 2.12.3
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