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nvme: export zoned namespaces without Zone Append support read-only 

Allow ZNS NVMe SSDs to present a read-only namespace when append is not
supported, instead of rejecting the namespace directly.

This allows (i) the namespace to be used in read-only mode, which is not
a problem as the append command only affects the write path, and (ii) to
use standard management tools such as nvme-cli to choose a different
format or firmware slot that is compatible with the Linux zoned block
device.

Signed-off-by: Javier González <javier.gonz@samsung.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Javier González 2020-12-01 13:02:21 +01:00 committed by Christoph Hellwig
parent ba4fb32056
commit 2f4c9ba23b
3 changed files with 12 additions and 5 deletions
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3
drivers/nvme/host/core.c
View File

@ -2125,7 +2125,8 @@ static void nvme_update_disk_info(struct gendisk *disk,
nvme_config_discard(disk, ns);
nvme_config_write_zeroes(disk, ns);
if (id->nsattr & NVME_NS_ATTR_RO)
if ((id->nsattr & NVME_NS_ATTR_RO) ||
test_bit(NVME_NS_FORCE_RO, &ns->flags))
set_disk_ro(disk, true);
}

1
drivers/nvme/host/nvme.h
View File

@ -452,6 +452,7 @@ struct nvme_ns {
#define NVME_NS_REMOVING 0
#define NVME_NS_DEAD 1
#define NVME_NS_ANA_PENDING 2
#define NVME_NS_FORCE_RO 3
struct nvme_fault_inject fault_inject;

13
drivers/nvme/host/zns.c
View File

@ -55,12 +55,17 @@ int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf)
int status;
/* Driver requires zone append support */
if (!(le32_to_cpu(log->iocs[nvme_cmd_zone_append]) &
if ((le32_to_cpu(log->iocs[nvme_cmd_zone_append]) &
NVME_CMD_EFFECTS_CSUPP)) {
if (test_and_clear_bit(NVME_NS_FORCE_RO, &ns->flags))
dev_warn(ns->ctrl->device,
"Zone Append supported for zoned namespace:%d. Remove read-only mode\n",
ns->head->ns_id);
} else {
set_bit(NVME_NS_FORCE_RO, &ns->flags);
dev_warn(ns->ctrl->device,
"append not supported for zoned namespace:%d\n",
ns->head->ns_id);
return -EINVAL;
"Zone Append not supported for zoned namespace:%d. Forcing to read-only mode\n",
ns->head->ns_id);
}
/* Lazily query controller append limit for the first zoned namespace */