From d6c40d87e7fed4b10f2fe93c90487145e2622ebf Mon Sep 17 00:00:00 2001 From: Daniel Wagner Date: Wed, 7 May 2025 14:22:57 +0200 Subject: [PATCH] nvmet-fcloop: track ref counts for nports A nport object is always used in association with targerport, remoteport, tport and rport objects. Add explicit references for any of the associated object. This ensures that nport is not removed too early on shutdown sequences. Signed-off-by: Daniel Wagner Signed-off-by: Christoph Hellwig --- drivers/nvme/target/fcloop.c | 135 ++++++++++++++++++++++++----------- 1 file changed, 92 insertions(+), 43 deletions(-) diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c index 641201e62c1b..a0828626db07 100644 --- a/drivers/nvme/target/fcloop.c +++ b/drivers/nvme/target/fcloop.c @@ -1047,8 +1047,14 @@ static void fcloop_remoteport_delete(struct nvme_fc_remote_port *remoteport) { struct fcloop_rport *rport = remoteport->private; + unsigned long flags; flush_work(&rport->ls_work); + + spin_lock_irqsave(&fcloop_lock, flags); + rport->nport->rport = NULL; + spin_unlock_irqrestore(&fcloop_lock, flags); + fcloop_nport_put(rport->nport); } @@ -1056,8 +1062,14 @@ static void fcloop_targetport_delete(struct nvmet_fc_target_port *targetport) { struct fcloop_tport *tport = targetport->private; + unsigned long flags; flush_work(&tport->ls_work); + + spin_lock_irqsave(&fcloop_lock, flags); + tport->nport->tport = NULL; + spin_unlock_irqrestore(&fcloop_lock, flags); + fcloop_nport_put(tport->nport); } @@ -1184,6 +1196,37 @@ __wait_localport_unreg(struct fcloop_lport *lport) return ret; } +static struct fcloop_nport * +__fcloop_nport_lookup(u64 node_name, u64 port_name) +{ + struct fcloop_nport *nport; + + list_for_each_entry(nport, &fcloop_nports, nport_list) { + if (nport->node_name != node_name || + nport->port_name != port_name) + continue; + + if (fcloop_nport_get(nport)) + return nport; + + break; + } + + return NULL; +} + +static struct fcloop_nport * +fcloop_nport_lookup(u64 node_name, u64 port_name) +{ + struct fcloop_nport *nport; + unsigned long flags; + + spin_lock_irqsave(&fcloop_lock, flags); + nport = __fcloop_nport_lookup(node_name, port_name); + spin_unlock_irqrestore(&fcloop_lock, flags); + + return nport; +} static ssize_t fcloop_delete_local_port(struct device *dev, struct device_attribute *attr, @@ -1365,6 +1408,8 @@ __unlink_remote_port(struct fcloop_nport *nport) { struct fcloop_rport *rport = nport->rport; + lockdep_assert_held(&fcloop_lock); + if (rport && nport->tport) nport->tport->remoteport = NULL; nport->rport = NULL; @@ -1377,9 +1422,6 @@ __unlink_remote_port(struct fcloop_nport *nport) static int __remoteport_unreg(struct fcloop_nport *nport, struct fcloop_rport *rport) { - if (!rport) - return -EALREADY; - return nvme_fc_unregister_remoteport(rport->remoteport); } @@ -1387,8 +1429,8 @@ static ssize_t fcloop_delete_remote_port(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - struct fcloop_nport *nport = NULL, *tmpport; - static struct fcloop_rport *rport; + struct fcloop_nport *nport; + struct fcloop_rport *rport; u64 nodename, portname; unsigned long flags; int ret; @@ -1397,24 +1439,24 @@ fcloop_delete_remote_port(struct device *dev, struct device_attribute *attr, if (ret) return ret; - spin_lock_irqsave(&fcloop_lock, flags); - - list_for_each_entry(tmpport, &fcloop_nports, nport_list) { - if (tmpport->node_name == nodename && - tmpport->port_name == portname && tmpport->rport) { - nport = tmpport; - rport = __unlink_remote_port(nport); - break; - } - } + nport = fcloop_nport_lookup(nodename, portname); + if (!nport) + return -ENOENT; + spin_lock_irqsave(&fcloop_lock, flags); + rport = __unlink_remote_port(nport); spin_unlock_irqrestore(&fcloop_lock, flags); - if (!nport) - return -ENOENT; + if (!rport) { + ret = -ENOENT; + goto out_nport_put; + } ret = __remoteport_unreg(nport, rport); +out_nport_put: + fcloop_nport_put(nport); + return ret ? ret : count; } @@ -1465,6 +1507,8 @@ __unlink_target_port(struct fcloop_nport *nport) { struct fcloop_tport *tport = nport->tport; + lockdep_assert_held(&fcloop_lock); + if (tport && nport->rport) nport->rport->targetport = NULL; nport->tport = NULL; @@ -1475,9 +1519,6 @@ __unlink_target_port(struct fcloop_nport *nport) static int __targetport_unreg(struct fcloop_nport *nport, struct fcloop_tport *tport) { - if (!tport) - return -EALREADY; - return nvmet_fc_unregister_targetport(tport->targetport); } @@ -1485,8 +1526,8 @@ static ssize_t fcloop_delete_target_port(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - struct fcloop_nport *nport = NULL, *tmpport; - struct fcloop_tport *tport = NULL; + struct fcloop_nport *nport; + struct fcloop_tport *tport; u64 nodename, portname; unsigned long flags; int ret; @@ -1495,24 +1536,24 @@ fcloop_delete_target_port(struct device *dev, struct device_attribute *attr, if (ret) return ret; - spin_lock_irqsave(&fcloop_lock, flags); - - list_for_each_entry(tmpport, &fcloop_nports, nport_list) { - if (tmpport->node_name == nodename && - tmpport->port_name == portname && tmpport->tport) { - nport = tmpport; - tport = __unlink_target_port(nport); - break; - } - } + nport = fcloop_nport_lookup(nodename, portname); + if (!nport) + return -ENOENT; + spin_lock_irqsave(&fcloop_lock, flags); + tport = __unlink_target_port(nport); spin_unlock_irqrestore(&fcloop_lock, flags); - if (!nport) - return -ENOENT; + if (!tport) { + ret = -ENOENT; + goto out_nport_put; + } ret = __targetport_unreg(nport, tport); +out_nport_put: + fcloop_nport_put(nport); + return ret ? ret : count; } @@ -1609,8 +1650,8 @@ out_destroy_class: static void __exit fcloop_exit(void) { - struct fcloop_lport *lport = NULL; - struct fcloop_nport *nport = NULL; + struct fcloop_lport *lport; + struct fcloop_nport *nport; struct fcloop_tport *tport; struct fcloop_rport *rport; unsigned long flags; @@ -1621,7 +1662,7 @@ static void __exit fcloop_exit(void) for (;;) { nport = list_first_entry_or_null(&fcloop_nports, typeof(*nport), nport_list); - if (!nport) + if (!nport || !fcloop_nport_get(nport)) break; tport = __unlink_target_port(nport); @@ -1629,13 +1670,21 @@ static void __exit fcloop_exit(void) spin_unlock_irqrestore(&fcloop_lock, flags); - ret = __targetport_unreg(nport, tport); - if (ret) - pr_warn("%s: Failed deleting target port\n", __func__); + if (tport) { + ret = __targetport_unreg(nport, tport); + if (ret) + pr_warn("%s: Failed deleting target port\n", + __func__); + } - ret = __remoteport_unreg(nport, rport); - if (ret) - pr_warn("%s: Failed deleting remote port\n", __func__); + if (rport) { + ret = __remoteport_unreg(nport, rport); + if (ret) + pr_warn("%s: Failed deleting remote port\n", + __func__); + } + + fcloop_nport_put(nport); spin_lock_irqsave(&fcloop_lock, flags); } -- 2.25.1