[Devel] [PATCH RH7 15/32] make proc_ns_operations work with struct ns_common * instead of void *
Pavel Tikhomirov
ptikhomirov at virtuozzo.com
Mon Jun 8 20:05:45 MSK 2020
From: Al Viro <viro at zeniv.linux.org.uk>
We can do that now. And kill ->inum(), while we are at it - all instances
are identical.
Signed-off-by: Al Viro <viro at zeniv.linux.org.uk>
(cherry picked from VZ8 commit 64964528b24ea390824f0e5ce9d34b8d39b28cde)
https://jira.sw.ru/browse/PSBM-102357
Signed-off-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
---
fs/namespace.c | 13 +++----------
fs/proc/inode.c | 2 +-
fs/proc/namespaces.c | 8 ++++----
include/linux/proc_ns.h | 10 +++++-----
ipc/namespace.c | 12 +++---------
kernel/pid_namespace.c | 12 +++---------
kernel/user_namespace.c | 12 +++---------
kernel/utsname.c | 12 +++---------
net/core/net_namespace.c | 12 +++---------
9 files changed, 28 insertions(+), 65 deletions(-)
diff --git a/fs/namespace.c b/fs/namespace.c
index f137ac232d4e..bd1bfa481f57 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3853,7 +3853,7 @@ bool mnt_may_suid(struct vfsmount *mnt)
current_in_userns(mnt->mnt_sb->s_user_ns);
}
-static void *mntns_get(struct task_struct *task)
+static struct ns_common *mntns_get(struct task_struct *task)
{
struct ns_common *ns = NULL;
struct nsproxy *nsproxy;
@@ -3869,12 +3869,12 @@ static void *mntns_get(struct task_struct *task)
return ns;
}
-static void mntns_put(void *ns)
+static void mntns_put(struct ns_common *ns)
{
put_mnt_ns(to_mnt_ns(ns));
}
-static int mntns_install(struct nsproxy *nsproxy, void *ns)
+static int mntns_install(struct nsproxy *nsproxy, struct ns_common *ns)
{
struct fs_struct *fs = current->fs;
struct mnt_namespace *mnt_ns = to_mnt_ns(ns), *old_mnt_ns;
@@ -3913,17 +3913,10 @@ static int mntns_install(struct nsproxy *nsproxy, void *ns)
return 0;
}
-static unsigned int mntns_inum(void *ns)
-{
- struct ns_common *p = ns;
- return p->inum;
-}
-
const struct proc_ns_operations mntns_operations = {
.name = "mnt",
.type = CLONE_NEWNS,
.get = mntns_get,
.put = mntns_put,
.install = mntns_install,
- .inum = mntns_inum,
};
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 4eef2b46b87e..8b0445574fe7 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -33,7 +33,7 @@ static void proc_evict_inode(struct inode *inode)
struct proc_dir_entry *de;
struct ctl_table_header *head;
const struct proc_ns_operations *ns_ops;
- void *ns;
+ struct ns_common *ns;
truncate_inode_pages_final(&inode->i_data);
clear_inode(inode);
diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c
index 86aff3a43db2..2d53aea1a691 100644
--- a/fs/proc/namespaces.c
+++ b/fs/proc/namespaces.c
@@ -70,7 +70,7 @@ static struct dentry *proc_ns_get_dentry(struct super_block *sb,
struct inode *inode;
struct proc_inode *ei;
struct qstr qname = { .name = "", };
- void *ns;
+ struct ns_common *ns;
ns = ns_ops->get(task);
if (!ns)
@@ -82,7 +82,7 @@ static struct dentry *proc_ns_get_dentry(struct super_block *sb,
return ERR_PTR(-ENOMEM);
}
- inode = iget_locked(sb, ns_ops->inum(ns));
+ inode = iget_locked(sb, ns->inum);
if (!inode) {
dput(dentry);
ns_ops->put(ns);
@@ -150,7 +150,7 @@ static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int bufl
struct proc_inode *ei = PROC_I(inode);
const struct proc_ns_operations *ns_ops = ei->ns.ns_ops;
struct task_struct *task;
- void *ns;
+ struct ns_common *ns;
char name[50];
int len = -EACCES;
@@ -166,7 +166,7 @@ static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int bufl
if (!ns)
goto out_put_task;
- snprintf(name, sizeof(name), "%s:[%u]", ns_ops->name, ns_ops->inum(ns));
+ snprintf(name, sizeof(name), "%s:[%u]", ns_ops->name, ns->inum);
len = strlen(name);
if (len > buflen)
diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h
index 5478e144c50a..3bd0aab95877 100644
--- a/include/linux/proc_ns.h
+++ b/include/linux/proc_ns.h
@@ -7,18 +7,18 @@
struct super_block;
struct pid_namespace;
struct nsproxy;
+struct ns_common;
struct proc_ns_operations {
const char *name;
int type;
- void *(*get)(struct task_struct *task);
- void (*put)(void *ns);
- int (*install)(struct nsproxy *nsproxy, void *ns);
- unsigned int (*inum)(void *ns);
+ struct ns_common *(*get)(struct task_struct *task);
+ void (*put)(struct ns_common *ns);
+ int (*install)(struct nsproxy *nsproxy, struct ns_common *ns);
};
struct proc_ns {
- void *ns;
+ struct ns_common *ns;
const struct proc_ns_operations *ns_ops;
};
diff --git a/ipc/namespace.c b/ipc/namespace.c
index 6781d622549e..84545678707e 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -156,7 +156,7 @@ static inline struct ipc_namespace *to_ipc_ns(struct ns_common *ns)
return container_of(ns, struct ipc_namespace, ns);
}
-static void *ipcns_get(struct task_struct *task)
+static struct ns_common *ipcns_get(struct task_struct *task)
{
struct ipc_namespace *ns = NULL;
struct nsproxy *nsproxy;
@@ -170,12 +170,12 @@ static void *ipcns_get(struct task_struct *task)
return ns ? &ns->ns : NULL;
}
-static void ipcns_put(void *ns)
+static void ipcns_put(struct ns_common *ns)
{
return put_ipc_ns(to_ipc_ns(ns));
}
-static int ipcns_install(struct nsproxy *nsproxy, void *new)
+static int ipcns_install(struct nsproxy *nsproxy, struct ns_common *new)
{
struct ipc_namespace *ns = to_ipc_ns(new);
if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN) ||
@@ -189,16 +189,10 @@ static int ipcns_install(struct nsproxy *nsproxy, void *new)
return 0;
}
-static unsigned int ipcns_inum(void *vp)
-{
- return ((struct ns_common *)vp)->inum;
-}
-
const struct proc_ns_operations ipcns_operations = {
.name = "ipc",
.type = CLONE_NEWIPC,
.get = ipcns_get,
.put = ipcns_put,
.install = ipcns_install,
- .inum = ipcns_inum,
};
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 2c478203cba3..29c9d06cf8fb 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -347,7 +347,7 @@ static inline struct pid_namespace *to_pid_ns(struct ns_common *ns)
return container_of(ns, struct pid_namespace, ns);
}
-static void *pidns_get(struct task_struct *task)
+static struct ns_common *pidns_get(struct task_struct *task)
{
struct pid_namespace *ns;
@@ -360,12 +360,12 @@ static void *pidns_get(struct task_struct *task)
return ns ? &ns->ns : NULL;
}
-static void pidns_put(void *ns)
+static void pidns_put(struct ns_common *ns)
{
put_pid_ns(to_pid_ns(ns));
}
-static int pidns_install(struct nsproxy *nsproxy, void *ns)
+static int pidns_install(struct nsproxy *nsproxy, struct ns_common *ns)
{
struct pid_namespace *active = task_active_pid_ns(current);
struct pid_namespace *ancestor, *new = to_pid_ns(ns);
@@ -396,18 +396,12 @@ static int pidns_install(struct nsproxy *nsproxy, void *ns)
return 0;
}
-static unsigned int pidns_inum(void *ns)
-{
- return ((struct ns_common *)ns)->inum;
-}
-
const struct proc_ns_operations pidns_operations = {
.name = "pid",
.type = CLONE_NEWPID,
.get = pidns_get,
.put = pidns_put,
.install = pidns_install,
- .inum = pidns_inum,
};
static __init int pid_namespaces_init(void)
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index c39871e61559..af9ff26c72b4 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -1031,7 +1031,7 @@ static inline struct user_namespace *to_user_ns(struct ns_common *ns)
return container_of(ns, struct user_namespace, ns);
}
-static void *userns_get(struct task_struct *task)
+static struct ns_common *userns_get(struct task_struct *task)
{
struct user_namespace *user_ns;
@@ -1042,12 +1042,12 @@ static void *userns_get(struct task_struct *task)
return user_ns ? &user_ns->ns : NULL;
}
-static void userns_put(void *ns)
+static void userns_put(struct ns_common *ns)
{
put_user_ns(to_user_ns(ns));
}
-static int userns_install(struct nsproxy *nsproxy, void *ns)
+static int userns_install(struct nsproxy *nsproxy, struct ns_common *ns)
{
struct user_namespace *user_ns = to_user_ns(ns);
struct cred *cred;
@@ -1078,18 +1078,12 @@ static int userns_install(struct nsproxy *nsproxy, void *ns)
return commit_creds(cred);
}
-static unsigned int userns_inum(void *ns)
-{
- return ((struct ns_common *)ns)->inum;
-}
-
const struct proc_ns_operations userns_operations = {
.name = "user",
.type = CLONE_NEWUSER,
.get = userns_get,
.put = userns_put,
.install = userns_install,
- .inum = userns_inum,
};
static __init int user_namespaces_init(void)
diff --git a/kernel/utsname.c b/kernel/utsname.c
index d8c062d2ab28..4247306327fa 100644
--- a/kernel/utsname.c
+++ b/kernel/utsname.c
@@ -147,7 +147,7 @@ static inline struct uts_namespace *to_uts_ns(struct ns_common *ns)
return container_of(ns, struct uts_namespace, ns);
}
-static void *utsns_get(struct task_struct *task)
+static struct ns_common *utsns_get(struct task_struct *task)
{
struct uts_namespace *ns = NULL;
struct nsproxy *nsproxy;
@@ -163,12 +163,12 @@ static void *utsns_get(struct task_struct *task)
return ns ? &ns->ns : NULL;
}
-static void utsns_put(void *ns)
+static void utsns_put(struct ns_common *ns)
{
put_uts_ns(to_uts_ns(ns));
}
-static int utsns_install(struct nsproxy *nsproxy, void *new)
+static int utsns_install(struct nsproxy *nsproxy, struct ns_common *new)
{
struct uts_namespace *ns = to_uts_ns(new);
@@ -182,16 +182,10 @@ static int utsns_install(struct nsproxy *nsproxy, void *new)
return 0;
}
-static unsigned int utsns_inum(void *vp)
-{
- return ((struct ns_common *)vp)->inum;
-}
-
const struct proc_ns_operations utsns_operations = {
.name = "uts",
.type = CLONE_NEWUTS,
.get = utsns_get,
.put = utsns_put,
.install = utsns_install,
- .inum = utsns_inum,
};
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 2a1413dd92a0..9564d242f941 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -1050,7 +1050,7 @@ void unregister_pernet_device(struct pernet_operations *ops)
EXPORT_SYMBOL_GPL(unregister_pernet_device);
#ifdef CONFIG_NET_NS
-static void *netns_get(struct task_struct *task)
+static struct ns_common *netns_get(struct task_struct *task)
{
struct net *net = NULL;
struct nsproxy *nsproxy;
@@ -1069,12 +1069,12 @@ static inline struct net *to_net_ns(struct ns_common *ns)
return container_of(ns, struct net, ns);
}
-static void netns_put(void *ns)
+static void netns_put(struct ns_common *ns)
{
put_net(to_net_ns(ns));
}
-static int netns_install(struct nsproxy *nsproxy, void *ns)
+static int netns_install(struct nsproxy *nsproxy, struct ns_common *ns)
{
struct net *net = to_net_ns(ns);
@@ -1087,17 +1087,11 @@ static int netns_install(struct nsproxy *nsproxy, void *ns)
return 0;
}
-static unsigned int netns_inum(void *ns)
-{
- return ((struct ns_common *)ns)->inum;
-}
-
const struct proc_ns_operations netns_operations = {
.name = "net",
.type = CLONE_NEWNET,
.get = netns_get,
.put = netns_put,
.install = netns_install,
- .inum = netns_inum,
};
#endif
--
2.24.1
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