In order to differentiate client state, assign a random uuid to the
uniquifing portion of the client identifier when a network namespace is
created. Containers may still override this value if they wish to maintain
stable client identifiers by writing to /sys/fs/nfs/net/client/identifier,
either by udev rules or other means.
Signed-off-by: Benjamin Coddington <bcodding@xxxxxxxxxx>
---
fs/nfs/sysfs.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/fs/nfs/sysfs.c b/fs/nfs/sysfs.c
index 8cb70755e3c9..9b811323fd7f 100644
--- a/fs/nfs/sysfs.c
+++ b/fs/nfs/sysfs.c
@@ -167,6 +167,18 @@ static struct nfs_netns_client *nfs_netns_client_alloc(struct kobject *parent,
return NULL;
}
+static void assign_unique_clientid(struct nfs_netns_client *clp)
+{
+ unsigned char client_uuid[16];
+ char *uuid_str = kmalloc(UUID_STRING_LEN + 1, GFP_KERNEL);
+
+ if (uuid_str) {
+ generate_random_uuid(client_uuid);
+ sprintf(uuid_str, "%pU", client_uuid);
+ rcu_assign_pointer(clp->identifier, uuid_str);
+ }
+}
+
void nfs_netns_sysfs_setup(struct nfs_net *netns, struct net *net)
{
struct nfs_netns_client *clp;
@@ -174,6 +186,8 @@ void nfs_netns_sysfs_setup(struct nfs_net *netns, struct net *net)
clp = nfs_netns_client_alloc(nfs_client_kobj, net);
if (clp) {
netns->nfs_client = clp;
+ if (net != &init_net)
+ assign_unique_clientid(clp);
kobject_uevent(&clp->kobject, KOBJ_ADD);
}
}
--
2.31.1
