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| author | Christoph Hellwig | 2018-05-13 19:00:13 +0200 |
|---|---|---|
| committer | Christoph Hellwig | 2018-07-27 19:13:01 +0200 |
| commit | 793c7cfce02ce88b7bd67d43834c052d16c096e3 (patch) | |
| tree | bc15ed260d3d74b37c81dff0a78ed417fffda1be /drivers/nvme/target/core.c | |
| parent | nvmet: keep a port pointer in nvmet_ctrl (diff) | |
| download | kernel-qcow2-linux-793c7cfce02ce88b7bd67d43834c052d16c096e3.tar.gz kernel-qcow2-linux-793c7cfce02ce88b7bd67d43834c052d16c096e3.tar.xz kernel-qcow2-linux-793c7cfce02ce88b7bd67d43834c052d16c096e3.zip | |
nvmet: track and limit the number of namespaces per subsystem
TP 4004 introduces a new 'Maximum Number of Allocated Namespaces' field
in the Identify controller data to help the host size resources. Put
an upper limit on the supported namespaces to be able to support this
value as supporting 32-bits worth of namespaces would lead to very
large buffers. The limit is completely arbitrary at this point.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Diffstat (limited to 'drivers/nvme/target/core.c')
| -rw-r--r-- | drivers/nvme/target/core.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index cbcd19f52121..42e8565015d5 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -337,9 +337,13 @@ static void nvmet_ns_dev_disable(struct nvmet_ns *ns) int nvmet_ns_enable(struct nvmet_ns *ns) { struct nvmet_subsys *subsys = ns->subsys; - int ret = 0; + int ret; mutex_lock(&subsys->lock); + ret = -EMFILE; + if (subsys->nr_namespaces == NVMET_MAX_NAMESPACES) + goto out_unlock; + ret = 0; if (ns->enabled) goto out_unlock; @@ -374,6 +378,7 @@ int nvmet_ns_enable(struct nvmet_ns *ns) list_add_tail_rcu(&ns->dev_link, &old->dev_link); } + subsys->nr_namespaces++; nvmet_ns_changed(subsys, ns->nsid); ns->enabled = true; @@ -414,6 +419,7 @@ void nvmet_ns_disable(struct nvmet_ns *ns) percpu_ref_exit(&ns->ref); mutex_lock(&subsys->lock); + subsys->nr_namespaces--; nvmet_ns_changed(subsys, ns->nsid); nvmet_ns_dev_disable(ns); out_unlock: |