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fold dup_mnt_ns() into its only surviving caller

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should've been done 6 years ago...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-09-28 20:47:57 -04:00
parent f6b742d869
commit 9559f68915
1 changed files with 18 additions and 30 deletions
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48
fs/namespace.c
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@ -2397,20 +2397,25 @@ static struct mnt_namespace *alloc_mnt_ns(struct user_namespace *user_ns)
return new_ns; return new_ns;
} }
/* struct mnt_namespace *copy_mnt_ns(unsigned long flags, struct mnt_namespace *ns,
* Allocate a new namespace structure and populate it with contents struct user_namespace *user_ns, struct fs_struct *new_fs)
* copied from the namespace of the passed in task structure.
*/
static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
struct user_namespace *user_ns, struct fs_struct *fs)
{ {
struct mnt_namespace *new_ns; struct mnt_namespace *new_ns;
struct vfsmount *rootmnt = NULL, *pwdmnt = NULL; struct vfsmount *rootmnt = NULL, *pwdmnt = NULL;
struct mount *p, *q; struct mount *p, *q;
struct mount *old = mnt_ns->root; struct mount *old;
struct mount *new; struct mount *new;
int copy_flags; int copy_flags;
BUG_ON(!ns);
if (likely(!(flags & CLONE_NEWNS))) {
get_mnt_ns(ns);
return ns;
}
old = ns->root;
new_ns = alloc_mnt_ns(user_ns); new_ns = alloc_mnt_ns(user_ns);
if (IS_ERR(new_ns)) if (IS_ERR(new_ns))
return new_ns; return new_ns;
@ -2418,7 +2423,7 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
namespace_lock(); namespace_lock();
/* First pass: copy the tree topology */ /* First pass: copy the tree topology */
copy_flags = CL_COPY_UNBINDABLE | CL_EXPIRE; copy_flags = CL_COPY_UNBINDABLE | CL_EXPIRE;
if (user_ns != mnt_ns->user_ns) if (user_ns != ns->user_ns)
copy_flags |= CL_SHARED_TO_SLAVE | CL_UNPRIVILEGED; copy_flags |= CL_SHARED_TO_SLAVE | CL_UNPRIVILEGED;
new = copy_tree(old, old->mnt.mnt_root, copy_flags); new = copy_tree(old, old->mnt.mnt_root, copy_flags);
if (IS_ERR(new)) { if (IS_ERR(new)) {
@ -2438,13 +2443,13 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
q = new; q = new;
while (p) { while (p) {
q->mnt_ns = new_ns; q->mnt_ns = new_ns;
if (fs) { if (new_fs) {
if (&p->mnt == fs->root.mnt) { if (&p->mnt == new_fs->root.mnt) {
fs->root.mnt = mntget(&q->mnt); new_fs->root.mnt = mntget(&q->mnt);
rootmnt = &p->mnt; rootmnt = &p->mnt;
} }
if (&p->mnt == fs->pwd.mnt) { if (&p->mnt == new_fs->pwd.mnt) {
fs->pwd.mnt = mntget(&q->mnt); new_fs->pwd.mnt = mntget(&q->mnt);
pwdmnt = &p->mnt; pwdmnt = &p->mnt;
} }
} }
@ -2465,23 +2470,6 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
return new_ns; return new_ns;
} }
struct mnt_namespace *copy_mnt_ns(unsigned long flags, struct mnt_namespace *ns,
struct user_namespace *user_ns, struct fs_struct *new_fs)
{
struct mnt_namespace *new_ns;
BUG_ON(!ns);
get_mnt_ns(ns);
if (!(flags & CLONE_NEWNS))
return ns;
new_ns = dup_mnt_ns(ns, user_ns, new_fs);
put_mnt_ns(ns);
return new_ns;
}
/** /**
* create_mnt_ns - creates a private namespace and adds a root filesystem * create_mnt_ns - creates a private namespace and adds a root filesystem
* @mnt: pointer to the new root filesystem mountpoint * @mnt: pointer to the new root filesystem mountpoint