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Commit 64964528 authored by Al Viro's avatar Al Viro
Browse files

make proc_ns_operations work with struct ns_common * instead of void * 



We can do that now.  And kill ->inum(), while we are at it - all instances
are identical.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 3c041184

fs/namespace.c

+3 −10
Original line number Diff line number Diff line
@@ -3149,7 +3149,7 @@ bool fs_fully_visible(struct file_system_type *type) 
	return visible;

}



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;
@@ -3165,12 +3165,12 @@ 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);
@@ -3203,17 +3203,10 @@ 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,

};

fs/proc/inode.c

+1 −1
Original line number Diff line number Diff line
@@ -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);

fs/proc/namespaces.c

+4 −4
Original line number Diff line number Diff line
@@ -64,7 +64,7 @@ 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)
@@ -76,7 +76,7 @@ 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);
@@ -144,7 +144,7 @@ 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 res = -EACCES;
@@ -160,7 +160,7 @@ 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);

	res = readlink_copy(buffer, buflen, name);

	ns_ops->put(ns);

out_put_task:

include/linux/proc_ns.h

+5 −5
Original line number Diff line number Diff line
@@ -6,18 +6,18 @@ 


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;

};

ipc/namespace.c

+3 −9
Original line number Diff line number Diff line
@@ -154,7 +154,7 @@ 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;
@@ -168,12 +168,12 @@ 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) ||
@@ -187,16 +187,10 @@ 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,

};