From 7d18d6c71372bde4d62eceb819de631cebd44367 Mon Sep 17 00:00:00 2001 From: Sungup Moon Date: Mon, 14 Mar 2022 20:05:45 +0900 Subject: [PATCH] nvme: allow duplicate NSIDs for private namespaces commit 5974ea7ce0f9a5987fc8cf5e08ad6e3e70bb542e upstream. A NVMe subsystem with multiple controller can have private namespaces that use the same NSID under some conditions: "If Namespace Management, ANA Reporting, or NVM Sets are supported, the NSIDs shall be unique within the NVM subsystem. If the Namespace Management, ANA Reporting, and NVM Sets are not supported, then NSIDs: a) for shared namespace shall be unique; and b) for private namespace are not required to be unique." Reference: Section 6.1.6 NSID and Namespace Usage; NVM Express 1.4c spec. Make sure this specific setup is supported in Linux. Fixes: 9ad1927a3bc2 ("nvme: always search for namespace head") Signed-off-by: Sungup Moon [hch: refactored and fixed the controller vs subsystem based naming conflict] Signed-off-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Signed-off-by: Greg Kroah-Hartman --- drivers/nvme/host/core.c | 15 ++++++++++----- drivers/nvme/host/multipath.c | 7 ++++--- drivers/nvme/host/nvme.h | 19 +++++++++++++++++++ include/linux/nvme.h | 1 + 4 files changed, 34 insertions(+), 8 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index b349e19..916f55b 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3510,15 +3510,20 @@ static const struct attribute_group *nvme_dev_attr_groups[] = { NULL, }; -static struct nvme_ns_head *nvme_find_ns_head(struct nvme_subsystem *subsys, +static struct nvme_ns_head *nvme_find_ns_head(struct nvme_ctrl *ctrl, unsigned nsid) { struct nvme_ns_head *h; - lockdep_assert_held(&subsys->lock); + lockdep_assert_held(&ctrl->subsys->lock); - list_for_each_entry(h, &subsys->nsheads, entry) { - if (h->ns_id != nsid) + list_for_each_entry(h, &ctrl->subsys->nsheads, entry) { + /* + * Private namespaces can share NSIDs under some conditions. + * In that case we can't use the same ns_head for namespaces + * with the same NSID. + */ + if (h->ns_id != nsid || !nvme_is_unique_nsid(ctrl, h)) continue; if (!list_empty(&h->list) && nvme_tryget_ns_head(h)) return h; @@ -3686,7 +3691,7 @@ static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid, int ret = 0; mutex_lock(&ctrl->subsys->lock); - head = nvme_find_ns_head(ctrl->subsys, nsid); + head = nvme_find_ns_head(ctrl, nsid); if (!head) { head = nvme_alloc_ns_head(ctrl, nsid, ids); if (IS_ERR(head)) { diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 727520c..e9301b5 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -462,10 +462,11 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head) /* * Add a multipath node if the subsystems supports multiple controllers. - * We also do this for private namespaces as the namespace sharing data could - * change after a rescan. + * We also do this for private namespaces as the namespace sharing flag + * could change after a rescan. */ - if (!(ctrl->subsys->cmic & NVME_CTRL_CMIC_MULTI_CTRL) || !multipath) + if (!(ctrl->subsys->cmic & NVME_CTRL_CMIC_MULTI_CTRL) || + !nvme_is_unique_nsid(ctrl, head) || !multipath) return 0; head->disk = blk_alloc_disk(ctrl->numa_node); diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index ed79a6c..0628e2d 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -693,6 +693,25 @@ static inline bool nvme_check_ready(struct nvme_ctrl *ctrl, struct request *rq, return true; return __nvme_check_ready(ctrl, rq, queue_live); } + +/* + * NSID shall be unique for all shared namespaces, or if at least one of the + * following conditions is met: + * 1. Namespace Management is supported by the controller + * 2. ANA is supported by the controller + * 3. NVM Set are supported by the controller + * + * In other case, private namespace are not required to report a unique NSID. + */ +static inline bool nvme_is_unique_nsid(struct nvme_ctrl *ctrl, + struct nvme_ns_head *head) +{ + return head->shared || + (ctrl->oacs & NVME_CTRL_OACS_NS_MNGT_SUPP) || + (ctrl->subsys->cmic & NVME_CTRL_CMIC_ANA) || + (ctrl->ctratt & NVME_CTRL_CTRATT_NVM_SETS); +} + int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, void *buf, unsigned bufflen); int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, diff --git a/include/linux/nvme.h b/include/linux/nvme.h index b7c4c41..039f59e 100644 --- a/include/linux/nvme.h +++ b/include/linux/nvme.h @@ -322,6 +322,7 @@ enum { NVME_CTRL_ONCS_TIMESTAMP = 1 << 6, NVME_CTRL_VWC_PRESENT = 1 << 0, NVME_CTRL_OACS_SEC_SUPP = 1 << 0, + NVME_CTRL_OACS_NS_MNGT_SUPP = 1 << 3, NVME_CTRL_OACS_DIRECTIVES = 1 << 5, NVME_CTRL_OACS_DBBUF_SUPP = 1 << 8, NVME_CTRL_LPA_CMD_EFFECTS_LOG = 1 << 1, -- 2.7.4