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authorSargun Dhillon <sargun@sargun.me>2020-10-13 00:43:39 +0300
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2020-10-13 22:56:54 +0300
commit61ca2c4afd9d108899e0fa48e7b1cfc9afe80596 (patch)
tree8f411540d3723a38a7b53c99336fc0f49d25a63c /fs/nfs/nfs4idmap.c
parenta2d24bcb97dc7b0be1cb891e60ae133bdf36c786 (diff)
downloadlinux-61ca2c4afd9d108899e0fa48e7b1cfc9afe80596.tar.xz
NFS: Only reference user namespace from nfs4idmap struct instead of cred
The nfs4idmapper only needs access to the user namespace, and not the entire cred struct. This replaces the struct cred* member with struct user_namespace*. This is mostly hygiene, so we don't have to hold onto the cred object, which has extraneous references to things like user_struct. This also makes switching away from init_user_ns more straightforward in the future. Signed-off-by: Sargun Dhillon <sargun@sargun.me> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/nfs4idmap.c')
-rw-r--r--fs/nfs/nfs4idmap.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/fs/nfs/nfs4idmap.c b/fs/nfs/nfs4idmap.c
index 62e6eea5c516..8d8aba305ecc 100644
--- a/fs/nfs/nfs4idmap.c
+++ b/fs/nfs/nfs4idmap.c
@@ -46,6 +46,7 @@
#include <keys/user-type.h>
#include <keys/request_key_auth-type.h>
#include <linux/module.h>
+#include <linux/user_namespace.h>
#include "internal.h"
#include "netns.h"
@@ -69,13 +70,13 @@ struct idmap {
struct rpc_pipe *idmap_pipe;
struct idmap_legacy_upcalldata *idmap_upcall_data;
struct mutex idmap_mutex;
- const struct cred *cred;
+ struct user_namespace *user_ns;
};
static struct user_namespace *idmap_userns(const struct idmap *idmap)
{
- if (idmap && idmap->cred)
- return idmap->cred->user_ns;
+ if (idmap && idmap->user_ns)
+ return idmap->user_ns;
return &init_user_ns;
}
@@ -286,7 +287,7 @@ static struct key *nfs_idmap_request_key(const char *name, size_t namelen,
if (ret < 0)
return ERR_PTR(ret);
- if (!idmap->cred || idmap->cred->user_ns == &init_user_ns)
+ if (!idmap->user_ns || idmap->user_ns == &init_user_ns)
rkey = request_key(&key_type_id_resolver, desc, "");
if (IS_ERR(rkey)) {
mutex_lock(&idmap->idmap_mutex);
@@ -462,7 +463,7 @@ nfs_idmap_new(struct nfs_client *clp)
return -ENOMEM;
mutex_init(&idmap->idmap_mutex);
- idmap->cred = get_cred(clp->cl_rpcclient->cl_cred);
+ idmap->user_ns = get_user_ns(clp->cl_rpcclient->cl_cred->user_ns);
rpc_init_pipe_dir_object(&idmap->idmap_pdo,
&nfs_idmap_pipe_dir_object_ops,
@@ -486,7 +487,7 @@ nfs_idmap_new(struct nfs_client *clp)
err_destroy_pipe:
rpc_destroy_pipe_data(idmap->idmap_pipe);
err:
- put_cred(idmap->cred);
+ get_user_ns(idmap->user_ns);
kfree(idmap);
return error;
}
@@ -503,7 +504,7 @@ nfs_idmap_delete(struct nfs_client *clp)
&clp->cl_rpcclient->cl_pipedir_objects,
&idmap->idmap_pdo);
rpc_destroy_pipe_data(idmap->idmap_pipe);
- put_cred(idmap->cred);
+ put_user_ns(idmap->user_ns);
kfree(idmap);
}