11 Dec, 2014

1 commit

• e149ed2b8   take the targets of /proc/*/ns/* symlinks to separate fs ... Browse Code »

  New pseudo-filesystem: nsfs. Targets of /proc/*/ns/* live there now.
  It's not mountable (not even registered, so it's not in /proc/filesystems,
  etc.). Files on it *are* bindable - we explicitly permit that in do_loopback().

  This stuff lives in fs/nsfs.c now; proc_ns_fget() moved there as well.
  get_proc_ns() is a macro now (it's simply returning ->i_private; would
  have been an inline, if not for header ordering headache).
  proc_ns_inode() is an ex-parrot. The interface used in procfs is
  ns_get_path(path, task, ops) and ns_get_name(buf, size, task, ops).

  Dentries and inodes are never hashed; a non-counting reference to dentry
  is stashed in ns_common (removed by ->d_prune()) and reused by ns_get_path()
  if present. See ns_get_path()/ns_prune_dentry/nsfs_evict() for details
  of that mechanism.

  As the result, proc_ns_follow_link() has stopped poking in nd->path.mnt;
  it does nd_jump_link() on a consistent pair it gets
  from ns_get_path().

  Signed-off-by: Al Viro

  Al Viro

  2014-12-11 10:30:20 +0800