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linux-sg2042
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bury struct proc_ns in fs/proc 

a) make get_proc_ns() return a pointer to struct ns_common
b) mirror ns_ops in dentry->d_fsdata of ns dentries, so that
is_mnt_ns_file() could get away with fewer dereferences.

That way struct proc_ns becomes invisible outside of fs/proc/*.c

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-11-01 03:13:17 -04:00
parent 33c429405a
commit f77c80142e
6 changed files with 15 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
fs/namespace.c
View File

@ -1570,16 +1570,7 @@ static bool is_mnt_ns_file(struct dentry *dentry)
{
/* Is this a proxy for a mount namespace? */
struct inode *inode = dentry->d_inode;
struct proc_ns *ei;
if (!proc_ns_inode(inode))
return false;
ei = get_proc_ns(inode);
if (ei->ns_ops != &mntns_operations)
return false;
return true;
return proc_ns_inode(inode) && dentry->d_fsdata == &mntns_operations;
}
struct mnt_namespace *to_mnt_ns(struct ns_common *ns)
@ -1596,7 +1587,7 @@ static bool mnt_ns_loop(struct dentry *dentry)
if (!is_mnt_ns_file(dentry))
return false;
mnt_ns = to_mnt_ns(get_proc_ns(dentry->d_inode)->ns);
mnt_ns = to_mnt_ns(get_proc_ns(dentry->d_inode));
return current->nsproxy->mnt_ns->seq >= mnt_ns->seq;
}

5
fs/proc/internal.h
View File

@ -57,6 +57,11 @@ union proc_op {
struct task_struct *task);
};
struct proc_ns {
struct ns_common *ns;
const struct proc_ns_operations *ns_ops;
};
struct proc_inode {
struct pid *pid;
int fd;

7
fs/proc/namespaces.c
View File

@ -45,7 +45,7 @@ static const struct inode_operations ns_inode_operations = {
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.ns_ops;
const struct proc_ns_operations *ns_ops = dentry->d_fsdata;
return dynamic_dname(dentry, buffer, buflen, "%s:[%lu]",
ns_ops->name, inode->i_ino);
@ -75,6 +75,7 @@ static struct dentry *proc_ns_get_dentry(struct super_block *sb,
ns_ops->put(ns);
return ERR_PTR(-ENOMEM);
}
dentry->d_fsdata = (void *)ns_ops;
inode = iget_locked(sb, ns->inum);
if (!inode) {
@ -286,9 +287,9 @@ out_invalid:
return ERR_PTR(-EINVAL);
}
struct proc_ns *get_proc_ns(struct inode *inode)
struct ns_common *get_proc_ns(struct inode *inode)
{
return &PROC_I(inode)->ns;
return PROC_I(inode)->ns.ns;
}
bool proc_ns_inode(struct inode *inode)

9
include/linux/proc_ns.h
View File

@ -16,11 +16,6 @@ struct proc_ns_operations {
int (*install)(struct nsproxy *nsproxy, struct ns_common *ns);
};
struct proc_ns {
struct ns_common *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;
@ -44,7 +39,7 @@ enum {
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 struct ns_common *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);
@ -59,7 +54,7 @@ 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 struct ns_common *get_proc_ns(struct inode *inode) { return NULL; }
static inline int proc_alloc_inum(unsigned int *inum)
{

4
kernel/nsproxy.c
View File

@ -222,7 +222,6 @@ SYSCALL_DEFINE2(setns, int, fd, int, nstype)
{
struct task_struct *tsk = current;
struct nsproxy *new_nsproxy;
struct proc_ns *ei;
struct file *file;
struct ns_common *ns;
int err;
@ -232,8 +231,7 @@ SYSCALL_DEFINE2(setns, int, fd, int, nstype)
return PTR_ERR(file);
err = -EINVAL;
ei = get_proc_ns(file_inode(file));
ns = ei->ns;
ns = get_proc_ns(file_inode(file));
if (nstype && (ns->ops->type != nstype))
goto out;

4
net/core/net_namespace.c
View File

@ -337,7 +337,6 @@ EXPORT_SYMBOL_GPL(__put_net);
struct net *get_net_ns_by_fd(int fd)
{
struct proc_ns *ei;
struct file *file;
struct ns_common *ns;
struct net *net;
@ -346,8 +345,7 @@ struct net *get_net_ns_by_fd(int fd)
if (IS_ERR(file))
return ERR_CAST(file);
ei = get_proc_ns(file_inode(file));
ns = ei->ns;
ns = get_proc_ns(file_inode(file));
if (ns->ops == &netns_operations)
net = get_net(container_of(ns, struct net, ns));
else