[PATCH 14/17] nvme: introduce a nvme_ns_ids structure
Christoph Hellwig
hch at lst.de
Mon Oct 23 07:51:23 PDT 2017
This allows us to manage the various uniqueue namespace identifiers
together instead needing various variables and arguments.
Signed-off-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Keith Busch <keith.busch at intel.com>
Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
---
drivers/nvme/host/core.c | 69 +++++++++++++++++++++++++++---------------------
drivers/nvme/host/nvme.h | 14 +++++++---
2 files changed, 49 insertions(+), 34 deletions(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index b3d468c77684..ab1a8022ead3 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -750,7 +750,7 @@ static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
}
static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
- u8 *eui64, u8 *nguid, uuid_t *uuid)
+ struct nvme_ns_ids *ids)
{
struct nvme_command c = { };
int status;
@@ -786,7 +786,7 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
goto free_data;
}
len = NVME_NIDT_EUI64_LEN;
- memcpy(eui64, data + pos + sizeof(*cur), len);
+ memcpy(ids->eui64, data + pos + sizeof(*cur), len);
break;
case NVME_NIDT_NGUID:
if (cur->nidl != NVME_NIDT_NGUID_LEN) {
@@ -796,7 +796,7 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
goto free_data;
}
len = NVME_NIDT_NGUID_LEN;
- memcpy(nguid, data + pos + sizeof(*cur), len);
+ memcpy(ids->nguid, data + pos + sizeof(*cur), len);
break;
case NVME_NIDT_UUID:
if (cur->nidl != NVME_NIDT_UUID_LEN) {
@@ -806,7 +806,7 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
goto free_data;
}
len = NVME_NIDT_UUID_LEN;
- uuid_copy(uuid, data + pos + sizeof(*cur));
+ uuid_copy(&ids->uuid, data + pos + sizeof(*cur));
break;
default:
/* Skip unnkown types */
@@ -1138,22 +1138,31 @@ static void nvme_config_discard(struct nvme_ns *ns)
}
static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
- struct nvme_id_ns *id, u8 *eui64, u8 *nguid, uuid_t *uuid)
+ struct nvme_id_ns *id, struct nvme_ns_ids *ids)
{
+ memset(ids, 0, sizeof(*ids));
+
if (ctrl->vs >= NVME_VS(1, 1, 0))
- memcpy(eui64, id->eui64, sizeof(id->eui64));
+ memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
if (ctrl->vs >= NVME_VS(1, 2, 0))
- memcpy(nguid, id->nguid, sizeof(id->nguid));
+ memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
if (ctrl->vs >= NVME_VS(1, 3, 0)) {
/* Don't treat error as fatal we potentially
* already have a NGUID or EUI-64
*/
- if (nvme_identify_ns_descs(ctrl, nsid, eui64, nguid, uuid))
+ if (nvme_identify_ns_descs(ctrl, nsid, ids))
dev_warn(ctrl->device,
"%s: Identify Descriptors failed\n", __func__);
}
}
+static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b)
+{
+ return uuid_equal(&a->uuid, &b->uuid) &&
+ memcmp(&a->nguid, &b->nguid, sizeof(a->nguid)) == 0 &&
+ memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0;
+}
+
static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
{
struct nvme_ns *ns = disk->private_data;
@@ -1194,8 +1203,7 @@ 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;
+ struct nvme_ns_ids ids;
int ret = 0;
if (test_bit(NVME_NS_DEAD, &ns->flags)) {
@@ -1212,10 +1220,8 @@ static int nvme_revalidate_disk(struct gendisk *disk)
goto out;
}
- 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))) {
+ nvme_report_ns_ids(ctrl, ns->ns_id, id, &ids);
+ if (!nvme_ns_ids_equal(&ns->ids, &ids)) {
dev_err(ctrl->device,
"identifiers changed for nsid %d\n", ns->ns_id);
ret = -ENODEV;
@@ -2110,18 +2116,19 @@ static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+ struct nvme_ns_ids *ids = &ns->ids;
struct nvme_subsystem *subsys = ns->ctrl->subsys;
int serial_len = sizeof(subsys->serial);
int model_len = sizeof(subsys->model);
- if (!uuid_is_null(&ns->uuid))
- return sprintf(buf, "uuid.%pU\n", &ns->uuid);
+ if (!uuid_is_null(&ids->uuid))
+ return sprintf(buf, "uuid.%pU\n", &ids->uuid);
- if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid)))
- return sprintf(buf, "eui.%16phN\n", ns->nguid);
+ if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
+ return sprintf(buf, "eui.%16phN\n", ids->nguid);
- if (memchr_inv(ns->eui, 0, sizeof(ns->eui)))
- return sprintf(buf, "eui.%8phN\n", ns->eui);
+ if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
+ return sprintf(buf, "eui.%8phN\n", ids->eui64);
while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' ||
subsys->serial[serial_len - 1] == '\0'))
@@ -2140,7 +2147,7 @@ static ssize_t nguid_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
- return sprintf(buf, "%pU\n", ns->nguid);
+ return sprintf(buf, "%pU\n", ns->ids.nguid);
}
static DEVICE_ATTR(nguid, S_IRUGO, nguid_show, NULL);
@@ -2148,16 +2155,17 @@ static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+ struct nvme_ns_ids *ids = &ns->ids;
/* For backward compatibility expose the NGUID to userspace if
* we have no UUID set
*/
- if (uuid_is_null(&ns->uuid)) {
+ if (uuid_is_null(&ids->uuid)) {
printk_ratelimited(KERN_WARNING
"No UUID available providing old NGUID\n");
- return sprintf(buf, "%pU\n", ns->nguid);
+ return sprintf(buf, "%pU\n", ids->nguid);
}
- return sprintf(buf, "%pU\n", &ns->uuid);
+ return sprintf(buf, "%pU\n", &ids->uuid);
}
static DEVICE_ATTR(uuid, S_IRUGO, uuid_show, NULL);
@@ -2165,7 +2173,7 @@ static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
- return sprintf(buf, "%8phd\n", ns->eui);
+ return sprintf(buf, "%8phd\n", ns->ids.eui64);
}
static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL);
@@ -2191,18 +2199,19 @@ static umode_t nvme_ns_attrs_are_visible(struct kobject *kobj,
{
struct device *dev = container_of(kobj, struct device, kobj);
struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+ struct nvme_ns_ids *ids = &ns->ids;
if (a == &dev_attr_uuid.attr) {
- if (uuid_is_null(&ns->uuid) ||
- !memchr_inv(ns->nguid, 0, sizeof(ns->nguid)))
+ if (uuid_is_null(&ids->uuid) ||
+ !memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
return 0;
}
if (a == &dev_attr_nguid.attr) {
- if (!memchr_inv(ns->nguid, 0, sizeof(ns->nguid)))
+ if (!memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
return 0;
}
if (a == &dev_attr_eui.attr) {
- if (!memchr_inv(ns->eui, 0, sizeof(ns->eui)))
+ if (!memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
return 0;
}
return a->mode;
@@ -2435,7 +2444,7 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
if (id->ncap == 0)
goto out_free_id;
- nvme_report_ns_ids(ctrl, ns->ns_id, id, ns->eui, ns->nguid, &ns->uuid);
+ nvme_report_ns_ids(ctrl, ns->ns_id, id, &ns->ids);
if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
if (nvme_nvm_register(ns, disk_name, node)) {
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 6a5702072048..efbf4dde6c87 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -214,6 +214,15 @@ struct nvme_subsystem {
u16 vendor_id;
};
+/*
+ * Container structure for uniqueue namespace identifiers.
+ */
+struct nvme_ns_ids {
+ u8 eui64[8];
+ u8 nguid[16];
+ uuid_t uuid;
+};
+
struct nvme_ns {
struct list_head list;
@@ -224,11 +233,8 @@ struct nvme_ns {
struct kref kref;
int instance;
- u8 eui[8];
- u8 nguid[16];
- uuid_t uuid;
-
unsigned ns_id;
+ struct nvme_ns_ids ids;
int lba_shift;
u16 ms;
u16 sgs;
--
2.14.2
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