From c16734ea98f5549fed9a1af47e943a45855274e0 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 25 May 2018 17:16:09 +0200 Subject: nvmet: implement the changed namespaces log Just keep a per-controller buffer of changed namespaces and copy it out in the get log page implementation. Signed-off-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Reviewed-by: Daniel Verkamp --- drivers/nvme/target/admin-cmd.c | 26 +++++++++++++++++++ drivers/nvme/target/core.c | 56 ++++++++++++++++++++++++++++++++++------- drivers/nvme/target/nvmet.h | 3 +++ 3 files changed, 76 insertions(+), 9 deletions(-) diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c index e96bb02c4f2c..52129d13770e 100644 --- a/drivers/nvme/target/admin-cmd.c +++ b/drivers/nvme/target/admin-cmd.c @@ -126,6 +126,29 @@ out: nvmet_req_complete(req, status); } +static void nvmet_execute_get_log_changed_ns(struct nvmet_req *req) +{ + struct nvmet_ctrl *ctrl = req->sq->ctrl; + u16 status = NVME_SC_INTERNAL; + size_t len; + + if (req->data_len != NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32)) + goto out; + + mutex_lock(&ctrl->lock); + if (ctrl->nr_changed_ns == U32_MAX) + len = sizeof(__le32); + else + len = ctrl->nr_changed_ns * sizeof(__le32); + status = nvmet_copy_to_sgl(req, 0, ctrl->changed_ns_list, len); + if (!status) + status = nvmet_zero_sgl(req, len, req->data_len - len); + ctrl->nr_changed_ns = 0; + mutex_unlock(&ctrl->lock); +out: + nvmet_req_complete(req, status); +} + static void nvmet_execute_identify_ctrl(struct nvmet_req *req) { struct nvmet_ctrl *ctrl = req->sq->ctrl; @@ -543,6 +566,9 @@ u16 nvmet_parse_admin_cmd(struct nvmet_req *req) */ req->execute = nvmet_execute_get_log_page_noop; return 0; + case NVME_LOG_CHANGED_NS: + req->execute = nvmet_execute_get_log_changed_ns; + return 0; } break; case nvme_admin_identify: diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index 55c4bc693aa2..4fe88e15c641 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -144,6 +144,42 @@ static void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type, schedule_work(&ctrl->async_event_work); } +static void nvmet_add_to_changed_ns_log(struct nvmet_ctrl *ctrl, __le32 nsid) +{ + u32 i; + + mutex_lock(&ctrl->lock); + if (ctrl->nr_changed_ns > NVME_MAX_CHANGED_NAMESPACES) + goto out_unlock; + + for (i = 0; i < ctrl->nr_changed_ns; i++) { + if (ctrl->changed_ns_list[i] == nsid) + goto out_unlock; + } + + if (ctrl->nr_changed_ns == NVME_MAX_CHANGED_NAMESPACES) { + ctrl->changed_ns_list[0] = cpu_to_le32(0xffffffff); + ctrl->nr_changed_ns = U32_MAX; + goto out_unlock; + } + + ctrl->changed_ns_list[ctrl->nr_changed_ns++] = nsid; +out_unlock: + mutex_unlock(&ctrl->lock); +} + +static void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid) +{ + struct nvmet_ctrl *ctrl; + + list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) { + nvmet_add_to_changed_ns_log(ctrl, cpu_to_le32(nsid)); + nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE, + NVME_AER_NOTICE_NS_CHANGED, + NVME_LOG_CHANGED_NS); + } +} + int nvmet_register_transport(const struct nvmet_fabrics_ops *ops) { int ret = 0; @@ -287,7 +323,6 @@ static void nvmet_ns_dev_disable(struct nvmet_ns *ns) int nvmet_ns_enable(struct nvmet_ns *ns) { struct nvmet_subsys *subsys = ns->subsys; - struct nvmet_ctrl *ctrl; int ret = 0; mutex_lock(&subsys->lock); @@ -326,9 +361,7 @@ int nvmet_ns_enable(struct nvmet_ns *ns) list_add_tail_rcu(&ns->dev_link, &old->dev_link); } - list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) - nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE, 0, 0); - + nvmet_ns_changed(subsys, ns->nsid); ns->enabled = true; ret = 0; out_unlock: @@ -342,7 +375,6 @@ out_dev_put: void nvmet_ns_disable(struct nvmet_ns *ns) { struct nvmet_subsys *subsys = ns->subsys; - struct nvmet_ctrl *ctrl; mutex_lock(&subsys->lock); if (!ns->enabled) @@ -368,9 +400,7 @@ void nvmet_ns_disable(struct nvmet_ns *ns) percpu_ref_exit(&ns->ref); mutex_lock(&subsys->lock); - list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) - nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE, 0, 0); - + nvmet_ns_changed(subsys, ns->nsid); nvmet_ns_dev_disable(ns); out_unlock: mutex_unlock(&subsys->lock); @@ -832,11 +862,16 @@ u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn, kref_init(&ctrl->ref); ctrl->subsys = subsys; + ctrl->changed_ns_list = kmalloc_array(NVME_MAX_CHANGED_NAMESPACES, + sizeof(__le32), GFP_KERNEL); + if (!ctrl->changed_ns_list) + goto out_free_ctrl; + ctrl->cqs = kcalloc(subsys->max_qid + 1, sizeof(struct nvmet_cq *), GFP_KERNEL); if (!ctrl->cqs) - goto out_free_ctrl; + goto out_free_changed_ns_list; ctrl->sqs = kcalloc(subsys->max_qid + 1, sizeof(struct nvmet_sq *), @@ -894,6 +929,8 @@ out_free_sqs: kfree(ctrl->sqs); out_free_cqs: kfree(ctrl->cqs); +out_free_changed_ns_list: + kfree(ctrl->changed_ns_list); out_free_ctrl: kfree(ctrl); out_put_subsystem: @@ -920,6 +957,7 @@ static void nvmet_ctrl_free(struct kref *ref) kfree(ctrl->sqs); kfree(ctrl->cqs); + kfree(ctrl->changed_ns_list); kfree(ctrl); nvmet_subsys_put(subsys); diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index 768abe203298..8cdc1e550396 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -135,6 +135,9 @@ struct nvmet_ctrl { const struct nvmet_fabrics_ops *ops; + __le32 *changed_ns_list; + u32 nr_changed_ns; + char subsysnqn[NVMF_NQN_FIELD_LEN]; char hostnqn[NVMF_NQN_FIELD_LEN]; }; -- cgit v1.2.3