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NFS: add localio to sysfs

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The Linux NFS client and server added support for LOCALIO in Linux
v6.12. It is useful to know if a client and server negotiated LOCALIO
be used, so expose it through the 'localio' attribute.

Suggested-by: Anna Schumaker <anna.schumaker@oracle.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
This commit is contained in:
Mike Snitzer 2025-05-13 15:50:44 -04:00 committed by Anna Schumaker
parent f72a67598c
commit 62d2cde203
1 changed files with 28 additions and 0 deletions
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28
fs/nfs/sysfs.c
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@ -387,6 +387,33 @@ static inline void nfs_sysfs_add_nfsv41_server(struct nfs_server *server)
}
#endif /* CONFIG_NFS_V4_1 */
#if IS_ENABLED(CONFIG_NFS_LOCALIO)
static ssize_t
localio_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct nfs_server *server = container_of(kobj, struct nfs_server, kobj);
bool localio = nfs_server_is_local(server->nfs_client);
return sysfs_emit(buf, "%d\n", localio);
}
static struct kobj_attribute nfs_sysfs_attr_localio = __ATTR_RO(localio);
static void nfs_sysfs_add_nfs_localio_server(struct nfs_server *server)
{
int ret = sysfs_create_file_ns(&server->kobj, &nfs_sysfs_attr_localio.attr,
nfs_netns_server_namespace(&server->kobj));
if (ret < 0)
pr_warn("NFS: sysfs_create_file_ns for server-%d failed (%d)\n",
server->s_sysfs_id, ret);
}
#else
static inline void nfs_sysfs_add_nfs_localio_server(struct nfs_server *server)
{
}
#endif /* IS_ENABLED(CONFIG_NFS_LOCALIO) */
void nfs_sysfs_add_server(struct nfs_server *server)
{
int ret;
@ -405,6 +432,7 @@ void nfs_sysfs_add_server(struct nfs_server *server)
server->s_sysfs_id, ret);
nfs_sysfs_add_nfsv41_server(server);
nfs_sysfs_add_nfs_localio_server(server);
}
EXPORT_SYMBOL_GPL(nfs_sysfs_add_server);