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nvme: don't blindly overwrite identifiers on disk revalidate

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Instead validate that these identifiers do not change, as that is
prohibited by the specification.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
This commit is contained in:
Christoph Hellwig 2017-08-17 14:10:00 +02:00
parent cdbff4f26b
commit 1d5df6af8c
1 changed files with 11 additions and 1 deletions
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12
drivers/nvme/host/core.c
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@ -1236,6 +1236,8 @@ static int nvme_revalidate_disk(struct gendisk *disk)
struct nvme_ns *ns = disk->private_data;
struct nvme_ctrl *ctrl = ns->ctrl;
struct nvme_id_ns *id;
u8 eui64[8] = { 0 }, nguid[16] = { 0 };
uuid_t uuid = uuid_null;
int ret = 0;
if (test_bit(NVME_NS_DEAD, &ns->flags)) {
@ -1252,7 +1254,15 @@ static int nvme_revalidate_disk(struct gendisk *disk)
goto out;
}
nvme_report_ns_ids(ctrl, ns->ns_id, id, ns->eui, ns->nguid, &ns->uuid);
nvme_report_ns_ids(ctrl, ns->ns_id, id, eui64, nguid, &uuid);
if (!uuid_equal(&ns->uuid, &uuid) ||
memcmp(&ns->nguid, &nguid, sizeof(ns->nguid)) ||
memcmp(&ns->eui, &eui64, sizeof(ns->eui))) {
dev_err(ctrl->device,
"identifiers changed for nsid %d\n", ns->ns_id);
ret = -ENODEV;
}
out:
kfree(id);
return ret;