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proc: Split the namespace stuff out into linux/proc_ns.h 

Split the proc namespace stuff out into linux/proc_ns.h.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: netdev@vger.kernel.org
cc: Serge E. Hallyn <serge.hallyn@ubuntu.com>
cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells 2013-04-12 01:50:06 +01:00 committed by Al Viro
parent c3bef7bcaa
commit 0bb80f2405
15 changed files with 109 additions and 92 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/namespace.c
View File

@ -21,7 +21,7 @@
#include <linux/fs_struct.h> /* get_fs_root et.al. */
#include <linux/fsnotify.h> /* fsnotify_vfsmount_delete */
#include <linux/uaccess.h>
#include <linux/proc_fs.h>
#include <linux/proc_ns.h>
#include "pnode.h"
#include "internal.h"
@ -1350,13 +1350,13 @@ static bool mnt_ns_loop(struct path *path)
* mount namespace loop?
*/
struct inode *inode = path->dentry->d_inode;
struct proc_inode *ei;
struct proc_ns *ei;
struct mnt_namespace *mnt_ns;
if (!proc_ns_inode(inode))
return false;
ei = PROC_I(inode);
ei = get_proc_ns(inode);
if (ei->ns_ops != &mntns_operations)
return false;

8
fs/proc/inode.c
View File

@ -51,8 +51,8 @@ static void proc_evict_inode(struct inode *inode)
sysctl_head_put(head);
}
/* Release any associated namespace */
ns_ops = PROC_I(inode)->ns_ops;
ns = PROC_I(inode)->ns;
ns_ops = PROC_I(inode)->ns.ns_ops;
ns = PROC_I(inode)->ns.ns;
if (ns_ops && ns)
ns_ops->put(ns);
}
@ -73,8 +73,8 @@ static struct inode *proc_alloc_inode(struct super_block *sb)
ei->pde = NULL;
ei->sysctl = NULL;
ei->sysctl_entry = NULL;
ei->ns = NULL;
ei->ns_ops = NULL;
ei->ns.ns = NULL;
ei->ns.ns_ops = NULL;
inode = &ei->vfs_inode;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
return inode;

17
fs/proc/namespaces.c
View File

@ -51,7 +51,7 @@ static int ns_delete_dentry(const struct dentry *dentry)
static char *ns_dname(struct dentry *dentry, char *buffer, int buflen)
{
struct inode *inode = dentry->d_inode;
const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops;
const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns.ns_ops;
return dynamic_dname(dentry, buffer, buflen, "%s:[%lu]",
ns_ops->name, inode->i_ino);
@ -95,8 +95,8 @@ static struct dentry *proc_ns_get_dentry(struct super_block *sb,
inode->i_op = &ns_inode_operations;
inode->i_mode = S_IFREG | S_IRUGO;
inode->i_fop = &ns_file_operations;
ei->ns_ops = ns_ops;
ei->ns = ns;
ei->ns.ns_ops = ns_ops;
ei->ns.ns = ns;
unlock_new_inode(inode);
} else {
ns_ops->put(ns);
@ -128,7 +128,7 @@ static void *proc_ns_follow_link(struct dentry *dentry, struct nameidata *nd)
if (!ptrace_may_access(task, PTRACE_MODE_READ))
goto out_put_task;
ns_path.dentry = proc_ns_get_dentry(sb, task, ei->ns_ops);
ns_path.dentry = proc_ns_get_dentry(sb, task, ei->ns.ns_ops);
if (IS_ERR(ns_path.dentry)) {
error = ERR_CAST(ns_path.dentry);
goto out_put_task;
@ -148,7 +148,7 @@ static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int bufl
{
struct inode *inode = dentry->d_inode;
struct proc_inode *ei = PROC_I(inode);
const struct proc_ns_operations *ns_ops = ei->ns_ops;
const struct proc_ns_operations *ns_ops = ei->ns.ns_ops;
struct task_struct *task;
void *ns;
char name[50];
@ -202,7 +202,7 @@ static struct dentry *proc_ns_instantiate(struct inode *dir,
ei = PROC_I(inode);
inode->i_mode = S_IFLNK|S_IRWXUGO;
inode->i_op = &proc_ns_link_inode_operations;
ei->ns_ops = ns_ops;
ei->ns.ns_ops = ns_ops;
d_set_d_op(dentry, &pid_dentry_operations);
d_add(dentry, inode);
@ -337,6 +337,11 @@ out_invalid:
return ERR_PTR(-EINVAL);
}
struct proc_ns *get_proc_ns(struct inode *inode)
{
return &PROC_I(inode)->ns;
}
bool proc_ns_inode(struct inode *inode)
{
return inode->i_fop == &ns_file_operations;

68
include/linux/proc_fs.h
View File

@ -6,6 +6,7 @@
#include <linux/spinlock.h>
#include <linux/magic.h>
#include <linux/atomic.h>
#include <linux/proc_ns.h>
struct net;
struct completion;
@ -23,18 +24,6 @@ struct mm_struct;
/* Worst case buffer size needed for holding an integer. */
#define PROC_NUMBUF 13
/*
* We always define these enumerators
*/
enum {
PROC_ROOT_INO = 1,
PROC_IPC_INIT_INO = 0xEFFFFFFFU,
PROC_UTS_INIT_INO = 0xEFFFFFFEU,
PROC_USER_INIT_INO = 0xEFFFFFFDU,
PROC_PID_INIT_INO = 0xEFFFFFFCU,
};
/*
* This is not completely implemented yet. The idea is to
* create an in-memory tree (like the actual /proc filesystem
@ -81,10 +70,6 @@ struct proc_dir_entry *proc_create_data(const char *name, umode_t mode,
extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
extern int remove_proc_subtree(const char *name, struct proc_dir_entry *parent);
struct pid_namespace;
extern int pid_ns_prepare_proc(struct pid_namespace *ns);
extern void pid_ns_release_proc(struct pid_namespace *ns);
/*
* proc_tty.c
@ -132,12 +117,6 @@ extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name,
extern void proc_set_size(struct proc_dir_entry *, loff_t);
extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
extern struct file *proc_ns_fget(int fd);
extern bool proc_ns_inode(struct inode *inode);
extern int proc_alloc_inum(unsigned int *pino);
extern void proc_free_inum(unsigned int inum);
#else
static inline void proc_flush_task(struct task_struct *task)
@ -168,50 +147,8 @@ struct tty_driver;
static inline void proc_tty_register_driver(struct tty_driver *driver) {};
static inline void proc_tty_unregister_driver(struct tty_driver *driver) {};
static inline int pid_ns_prepare_proc(struct pid_namespace *ns)
{
return 0;
}
static inline void pid_ns_release_proc(struct pid_namespace *ns)
{
}
static inline struct file *proc_ns_fget(int fd)
{
return ERR_PTR(-EINVAL);
}
static inline bool proc_ns_inode(struct inode *inode)
{
return false;
}
static inline int proc_alloc_inum(unsigned int *inum)
{
*inum = 1;
return 0;
}
static inline void proc_free_inum(unsigned int inum)
{
}
#endif /* CONFIG_PROC_FS */
struct nsproxy;
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);
};
extern const struct proc_ns_operations netns_operations;
extern const struct proc_ns_operations utsns_operations;
extern const struct proc_ns_operations ipcns_operations;
extern const struct proc_ns_operations pidns_operations;
extern const struct proc_ns_operations userns_operations;
extern const struct proc_ns_operations mntns_operations;
union proc_op {
int (*proc_get_link)(struct dentry *, struct path *);
@ -231,8 +168,7 @@ struct proc_inode {
struct proc_dir_entry *pde;
struct ctl_table_header *sysctl;
struct ctl_table *sysctl_entry;
void *ns;
const struct proc_ns_operations *ns_ops;
struct proc_ns ns;
struct inode vfs_inode;
};

74
include/linux/proc_ns.h Normal file
View File

@ -0,0 +1,74 @@
/*
* procfs namespace bits
*/
#ifndef _LINUX_PROC_NS_H
#define _LINUX_PROC_NS_H
struct pid_namespace;
struct nsproxy;
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 proc_ns {
void *ns;
const struct proc_ns_operations *ns_ops;
};
extern const struct proc_ns_operations netns_operations;
extern const struct proc_ns_operations utsns_operations;
extern const struct proc_ns_operations ipcns_operations;
extern const struct proc_ns_operations pidns_operations;
extern const struct proc_ns_operations userns_operations;
extern const struct proc_ns_operations mntns_operations;
/*
* We always define these enumerators
*/
enum {
PROC_ROOT_INO = 1,
PROC_IPC_INIT_INO = 0xEFFFFFFFU,
PROC_UTS_INIT_INO = 0xEFFFFFFEU,
PROC_USER_INIT_INO = 0xEFFFFFFDU,
PROC_PID_INIT_INO = 0xEFFFFFFCU,
};
#ifdef CONFIG_PROC_FS
extern int pid_ns_prepare_proc(struct pid_namespace *ns);
extern void pid_ns_release_proc(struct pid_namespace *ns);
extern struct file *proc_ns_fget(int fd);
extern struct proc_ns *get_proc_ns(struct inode *);
extern int proc_alloc_inum(unsigned int *pino);
extern void proc_free_inum(unsigned int inum);
extern bool proc_ns_inode(struct inode *inode);
#else /* CONFIG_PROC_FS */
static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
static inline struct file *proc_ns_fget(int fd)
{
return ERR_PTR(-EINVAL);
}
static inline struct proc_ns *get_proc_ns(struct inode *inode) { return NULL; }
static inline int proc_alloc_inum(unsigned int *inum)
{
*inum = 1;
return 0;
}
static inline void proc_free_inum(unsigned int inum) {}
static inline bool proc_ns_inode(struct inode *inode) { return false; }
#endif /* CONFIG_PROC_FS */
#endif /* _LINUX_PROC_NS_H */

2
init/version.c
View File

@ -12,7 +12,7 @@
#include <linux/utsname.h>
#include <generated/utsrelease.h>
#include <linux/version.h>
#include <linux/proc_fs.h>
#include <linux/proc_ns.h>
#ifndef CONFIG_KALLSYMS
#define version(a) Version_ ## a

2
ipc/msgutil.c
View File

@ -16,7 +16,7 @@
#include <linux/msg.h>
#include <linux/ipc_namespace.h>
#include <linux/utsname.h>
#include <linux/proc_fs.h>
#include <linux/proc_ns.h>
#include <asm/uaccess.h>
#include "util.h"

2
ipc/namespace.c
View File

@ -12,7 +12,7 @@
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/user_namespace.h>
#include <linux/proc_fs.h>
#include <linux/proc_ns.h>
#include "util.h"

6
kernel/nsproxy.c
View File

@ -22,7 +22,7 @@
#include <linux/pid_namespace.h>
#include <net/net_namespace.h>
#include <linux/ipc_namespace.h>
#include <linux/proc_fs.h>
#include <linux/proc_ns.h>
#include <linux/file.h>
#include <linux/syscalls.h>
@ -241,7 +241,7 @@ SYSCALL_DEFINE2(setns, int, fd, int, nstype)
const struct proc_ns_operations *ops;
struct task_struct *tsk = current;
struct nsproxy *new_nsproxy;
struct proc_inode *ei;
struct proc_ns *ei;
struct file *file;
int err;
@ -250,7 +250,7 @@ SYSCALL_DEFINE2(setns, int, fd, int, nstype)
return PTR_ERR(file);
err = -EINVAL;
ei = PROC_I(file_inode(file));
ei = get_proc_ns(file_inode(file));
ops = ei->ns_ops;
if (nstype && (ops->type != nstype))
goto out;

1
kernel/pid.c
View File

@ -36,6 +36,7 @@
#include <linux/pid_namespace.h>
#include <linux/init_task.h>
#include <linux/syscalls.h>
#include <linux/proc_ns.h>
#include <linux/proc_fs.h>
#define pid_hashfn(nr, ns) \

2
kernel/pid_namespace.c
View File

@ -15,7 +15,7 @@
#include <linux/err.h>
#include <linux/acct.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/proc_ns.h>
#include <linux/reboot.h>
#include <linux/export.h>

2
kernel/user.c
View File

@ -16,7 +16,7 @@
#include <linux/interrupt.h>
#include <linux/export.h>
#include <linux/user_namespace.h>
#include <linux/proc_fs.h>
#include <linux/proc_ns.h>
/*
* userns count is 1 for root user, 1 for init_uts_ns,

2
kernel/user_namespace.c
View File

@ -9,7 +9,7 @@
#include <linux/nsproxy.h>
#include <linux/slab.h>
#include <linux/user_namespace.h>
#include <linux/proc_fs.h>
#include <linux/proc_ns.h>
#include <linux/highuid.h>
#include <linux/cred.h>
#include <linux/securebits.h>

2
kernel/utsname.c
View File

@ -15,7 +15,7 @@
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/user_namespace.h>
#include <linux/proc_fs.h>
#include <linux/proc_ns.h>
static struct uts_namespace *create_uts_ns(void)
{

7
net/core/net_namespace.c
View File

@ -10,7 +10,8 @@
#include <linux/idr.h>
#include <linux/rculist.h>
#include <linux/nsproxy.h>
#include <linux/proc_fs.h>
#include <linux/fs.h>
#include <linux/proc_ns.h>
#include <linux/file.h>
#include <linux/export.h>
#include <linux/user_namespace.h>
@ -336,7 +337,7 @@ EXPORT_SYMBOL_GPL(__put_net);
struct net *get_net_ns_by_fd(int fd)
{
struct proc_inode *ei;
struct proc_ns *ei;
struct file *file;
struct net *net;
@ -344,7 +345,7 @@ struct net *get_net_ns_by_fd(int fd)
if (IS_ERR(file))
return ERR_CAST(file);
ei = PROC_I(file_inode(file));
ei = get_proc_ns(file_inode(file));
if (ei->ns_ops == &netns_operations)
net = get_net(ei->ns);
else