On Mon, 2007-11-26 at 15:17 -0700, Eric W. Biederman wrote:

Well I clearly goofed when I added the initial network namespace support
for /proc/net.  Currently things work but there are odd details visible
to user space, even when we have a single network namespace.

Since we do not cache proc_dir_entry dentries at the moment we can
just modify ->lookup to return a different directory inode depending
on the network namespace of the process looking at /proc/net, replacing
the current technique of using a magic and fragile follow_link method.

To accomplish that this patch:
- introduces a shadow_proc method to allow different dentries to
  be returned from proc_lookup.
- Removes the old /proc/net follow_link magic
- Fixes a weakness in our not caching of proc generic dentries.

As shadow_proc uses a task struct to decided which dentry to return we
can go back later and fix the proc generic caching without modifying any code that
uses the shadow_proc method.

Signed-off-by: Eric W. Biederman <redacted>
---
 fs/proc/generic.c       |   12 ++++++-
 fs/proc/proc_net.c      |   86 +++--------------------------------------------
 include/linux/proc_fs.h |    3 ++
 3 files changed, 19 insertions(+), 82 deletions(-)

(commit 2b1e300a9dfc3196ccddf6f1d74b91b7af55e416)

This seems to have broken the use of /proc/bus/usb as a mountpoint. It
always appears empty now, whatever's supposed to be mounted there.

-- 
dwmw2