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netns: use stable inode number for initial mount ns

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Apart from the network and mount namespace all other namespaces expose a
stable inode number and userspace has been relying on that for a very
long time now. It's very much heavily used API. Align the network
namespace and use a stable inode number from the reserved procfs inode
number space so this is consistent across all namespaces.

Link: https://lore.kernel.org/20250606-work-nsfs-v1-2-b8749c9a8844@kernel.org
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-06-06 11:45:08 +02:00
parent 6a9e2fb1ba
commit 9b0240b3cc
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3 changed files with 10 additions and 0 deletions
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1
include/linux/proc_ns.h
View File

@ -47,6 +47,7 @@ enum {
PROC_PID_INIT_INO = PID_NS_INIT_INO,
PROC_CGROUP_INIT_INO = CGROUP_NS_INIT_INO,
PROC_TIME_INIT_INO = TIME_NS_INIT_INO,
PROC_NET_INIT_INO = NET_NS_INIT_INO,
};
#ifdef CONFIG_PROC_FS

1
include/uapi/linux/nsfs.h
View File

@ -49,6 +49,7 @@ enum init_ns_ino {
PID_NS_INIT_INO = 0xEFFFFFFCU,
CGROUP_NS_INIT_INO = 0xEFFFFFFBU,
TIME_NS_INIT_INO = 0xEFFFFFFAU,
NET_NS_INIT_INO = 0xEFFFFFF9U,
};
#endif /* __LINUX_NSFS_H */

8
net/core/net_namespace.c
View File

@ -796,11 +796,19 @@ static __net_init int net_ns_net_init(struct net *net)
#ifdef CONFIG_NET_NS
net->ns.ops = &netns_operations;
#endif
if (net == &init_net) {
net->ns.inum = PROC_NET_INIT_INO;
return 0;
}
return ns_alloc_inum(&net->ns);
}
static __net_exit void net_ns_net_exit(struct net *net)
{
/*
* Initial network namespace doesn't exit so we don't need any
* special checks here.
*/
ns_free_inum(&net->ns);
}