From 253928eec61a52935584777f0dfba6cdb63967b6 Mon Sep 17 00:00:00 2001 From: Sagi Grimberg Date: Mon, 12 Nov 2018 13:56:39 -0800 Subject: [PATCH] nvmet: allow host connect even if no allowed subsystems are exported It is perfectly valid that a host connects to a discovery subsystem and gets an empty discovery log page since no subsystems are provisioned to it. No reason to disallow connecting to the discovery subsystem all together. Signed-off-by: Sagi Grimberg Reviewed-by: Jay Sternberg Reviewed-by: Phil Cayton Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe --- drivers/nvme/target/core.c | 34 +++++++--------------------------- drivers/nvme/target/discovery.c | 2 +- drivers/nvme/target/nvmet.h | 3 +-- 3 files changed, 9 insertions(+), 30 deletions(-) diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index 46345c3..849080b 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -1032,14 +1032,18 @@ u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd) return 0; } -static bool __nvmet_host_allowed(struct nvmet_subsys *subsys, - const char *hostnqn) +bool nvmet_host_allowed(struct nvmet_subsys *subsys, const char *hostnqn) { struct nvmet_host_link *p; + lockdep_assert_held(&nvmet_config_sem); + if (subsys->allow_any_host) return true; + if (subsys->type == NVME_NQN_DISC) /* allow all access to disc subsys */ + return true; + list_for_each_entry(p, &subsys->hosts, entry) { if (!strcmp(nvmet_host_name(p->host), hostnqn)) return true; @@ -1048,30 +1052,6 @@ static bool __nvmet_host_allowed(struct nvmet_subsys *subsys, return false; } -static bool nvmet_host_discovery_allowed(struct nvmet_req *req, - const char *hostnqn) -{ - struct nvmet_subsys_link *s; - - list_for_each_entry(s, &req->port->subsystems, entry) { - if (__nvmet_host_allowed(s->subsys, hostnqn)) - return true; - } - - return false; -} - -bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys, - const char *hostnqn) -{ - lockdep_assert_held(&nvmet_config_sem); - - if (subsys->type == NVME_NQN_DISC) - return nvmet_host_discovery_allowed(req, hostnqn); - else - return __nvmet_host_allowed(subsys, hostnqn); -} - /* * Note: ctrl->subsys->lock should be held when calling this function */ @@ -1122,7 +1102,7 @@ u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn, status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; down_read(&nvmet_config_sem); - if (!nvmet_host_allowed(req, subsys, hostnqn)) { + if (!nvmet_host_allowed(subsys, hostnqn)) { pr_info("connect by host %s for subsystem %s not allowed\n", hostnqn, subsysnqn); req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(hostnqn); diff --git a/drivers/nvme/target/discovery.c b/drivers/nvme/target/discovery.c index 050e4d7..5fbb1bb 100644 --- a/drivers/nvme/target/discovery.c +++ b/drivers/nvme/target/discovery.c @@ -107,7 +107,7 @@ static void nvmet_execute_get_disc_log_page(struct nvmet_req *req) down_read(&nvmet_config_sem); list_for_each_entry(p, &req->port->subsystems, entry) { - if (!nvmet_host_allowed(req, p->subsys, ctrl->hostnqn)) + if (!nvmet_host_allowed(p->subsys, ctrl->hostnqn)) continue; if (residual_len >= entry_size) { char traddr[NVMF_TRADDR_SIZE]; diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index bc99c70..05b98f2 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -468,8 +468,7 @@ extern u32 nvmet_ana_group_enabled[NVMET_MAX_ANAGRPS + 1]; extern u64 nvmet_ana_chgcnt; extern struct rw_semaphore nvmet_ana_sem; -bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys, - const char *hostnqn); +bool nvmet_host_allowed(struct nvmet_subsys *subsys, const char *hostnqn); int nvmet_bdev_ns_enable(struct nvmet_ns *ns); int nvmet_file_ns_enable(struct nvmet_ns *ns); -- 2.7.4