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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull vfs pile #2 from Al Viro:
 "Next pile (and there'll be one or two more).

  The large piece in this one is getting rid of /proc/*/ns/* weirdness;
  among other things, it allows to (finally) make nameidata completely
  opaque outside of fs/namei.c, making for easier further cleanups in
  there"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  coda_venus_readdir(): use file_inode()
  fs/namei.c: fold link_path_walk() call into path_init()
  path_init(): don't bother with LOOKUP_PARENT in argument
  fs/namei.c: new helper (path_cleanup())
  path_init(): store the "base" pointer to file in nameidata itself
  make default ->i_fop have ->open() fail with ENXIO
  make nameidata completely opaque outside of fs/namei.c
  kill proc_ns completely
  take the targets of /proc/*/ns/* symlinks to separate fs
  bury struct proc_ns in fs/proc
  copy address of proc_ns_ops into ns_common
  new helpers: ns_alloc_inum/ns_free_inum
  make proc_ns_operations work with struct ns_common * instead of void *
  switch the rest of proc_ns_operations to working with &...->ns
  netns: switch ->get()/->put()/->install()/->inum() to working with &net->ns
  make mntns ->get()/->put()/->install()/->inum() work with &mnt_ns->ns
  common object embedded into various struct ....ns
This commit is contained in:
Linus Torvalds 2014-12-16 15:53:03 -08:00
commit 603ba7e41b
36 changed files with 416 additions and 430 deletions
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5
ipc/msgutil.c
View file

@ -31,7 +31,10 @@ DEFINE_SPINLOCK(mq_lock);
struct ipc_namespace init_ipc_ns = {
.count = ATOMIC_INIT(1),
.user_ns = &init_user_ns,
.proc_inum = PROC_IPC_INIT_INO,
.ns.inum = PROC_IPC_INIT_INO,
#ifdef CONFIG_IPC_NS
.ns.ops = &ipcns_operations,
#endif
};
atomic_t nr_ipc_ns = ATOMIC_INIT(1);

32
ipc/namespace.c
View file

@ -26,16 +26,17 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
if (ns == NULL)
return ERR_PTR(-ENOMEM);
err = proc_alloc_inum(&ns->proc_inum);
err = ns_alloc_inum(&ns->ns);
if (err) {
kfree(ns);
return ERR_PTR(err);
}
ns->ns.ops = &ipcns_operations;
atomic_set(&ns->count, 1);
err = mq_init_ns(ns);
if (err) {
proc_free_inum(ns->proc_inum);
ns_free_inum(&ns->ns);
kfree(ns);
return ERR_PTR(err);
}
@ -97,7 +98,7 @@ static void free_ipc_ns(struct ipc_namespace *ns)
atomic_dec(&nr_ipc_ns);
put_user_ns(ns->user_ns);
proc_free_inum(ns->proc_inum);
ns_free_inum(&ns->ns);
kfree(ns);
}
@ -127,7 +128,12 @@ void put_ipc_ns(struct ipc_namespace *ns)
}
}
static void *ipcns_get(struct task_struct *task)
static inline struct ipc_namespace *to_ipc_ns(struct ns_common *ns)
{
return container_of(ns, struct ipc_namespace, ns);
}
static struct ns_common *ipcns_get(struct task_struct *task)
{
struct ipc_namespace *ns = NULL;
struct nsproxy *nsproxy;
@ -138,17 +144,17 @@ static void *ipcns_get(struct task_struct *task)
ns = get_ipc_ns(nsproxy->ipc_ns);
task_unlock(task);
return ns;
return ns ? &ns->ns : NULL;
}
static void ipcns_put(void *ns)
static void ipcns_put(struct ns_common *ns)
{
return put_ipc_ns(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 = new;
struct ipc_namespace *ns = to_ipc_ns(new);
if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN) ||
!ns_capable(current_user_ns(), CAP_SYS_ADMIN))
return -EPERM;
@ -160,18 +166,10 @@ static int ipcns_install(struct nsproxy *nsproxy, void *new)
return 0;
}
static unsigned int ipcns_inum(void *vp)
{
struct ipc_namespace *ns = vp;
return ns->proc_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,
};