From e3222c4ecc649c4ae568e61dda9349482401b501 Mon Sep 17 00:00:00 2001 From: Badari Pulavarty Date: Tue, 8 May 2007 00:25:21 -0700 Subject: Merge sys_clone()/sys_unshare() nsproxy and namespace handling sys_clone() and sys_unshare() both makes copies of nsproxy and its associated namespaces. But they have different code paths. This patch merges all the nsproxy and its associated namespace copy/clone handling (as much as possible). Posted on container list earlier for feedback. - Create a new nsproxy and its associated namespaces and pass it back to caller to attach it to right process. - Changed all copy_*_ns() routines to return a new copy of namespace instead of attaching it to task->nsproxy. - Moved the CAP_SYS_ADMIN checks out of copy_*_ns() routines. - Removed unnessary !ns checks from copy_*_ns() and added BUG_ON() just incase. - Get rid of all individual unshare_*_ns() routines and make use of copy_*_ns() instead. [akpm@osdl.org: cleanups, warning fix] [clg@fr.ibm.com: remove dup_namespaces() declaration] [serue@us.ibm.com: fix CONFIG_IPC_NS=n, clone(CLONE_NEWIPC) retval] [akpm@linux-foundation.org: fix build with CONFIG_SYSVIPC=n] Signed-off-by: Badari Pulavarty Signed-off-by: Serge Hallyn Cc: Cedric Le Goater Cc: "Eric W. Biederman" Cc: Signed-off-by: Cedric Le Goater Cc: Oleg Nesterov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/namespace.c | 30 +++++++----------------------- 1 file changed, 7 insertions(+), 23 deletions(-) (limited to 'fs/namespace.c') diff --git a/fs/namespace.c b/fs/namespace.c index fd999cab7b57..be5e56bfb73e 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1441,10 +1441,9 @@ dput_out: * Allocate a new namespace structure and populate it with contents * copied from the namespace of the passed in task structure. */ -struct mnt_namespace *dup_mnt_ns(struct task_struct *tsk, +static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns, struct fs_struct *fs) { - struct mnt_namespace *mnt_ns = tsk->nsproxy->mnt_ns; struct mnt_namespace *new_ns; struct vfsmount *rootmnt = NULL, *pwdmnt = NULL, *altrootmnt = NULL; struct vfsmount *p, *q; @@ -1509,36 +1508,21 @@ struct mnt_namespace *dup_mnt_ns(struct task_struct *tsk, return new_ns; } -int copy_mnt_ns(int flags, struct task_struct *tsk) +struct mnt_namespace *copy_mnt_ns(int flags, struct mnt_namespace *ns, + struct fs_struct *new_fs) { - struct mnt_namespace *ns = tsk->nsproxy->mnt_ns; struct mnt_namespace *new_ns; - int err = 0; - - if (!ns) - return 0; + BUG_ON(!ns); get_mnt_ns(ns); if (!(flags & CLONE_NEWNS)) - return 0; - - if (!capable(CAP_SYS_ADMIN)) { - err = -EPERM; - goto out; - } - - new_ns = dup_mnt_ns(tsk, tsk->fs); - if (!new_ns) { - err = -ENOMEM; - goto out; - } + return ns; - tsk->nsproxy->mnt_ns = new_ns; + new_ns = dup_mnt_ns(ns, new_fs); -out: put_mnt_ns(ns); - return err; + return new_ns; } asmlinkage long sys_mount(char __user * dev_name, char __user * dir_name, -- cgit v1.2.3