[PATCH 0/3] Reduce impact of overlayfs fake path files

[Amir Goldstein <amir73il@gmail.com>]

Miklos,

This is the solution that we discussed for removing FMODE_NONOTIFY
from overlayfs real files.

My branch [1] has an extra patch for remove FMODE_NONOTIFY, but
I am still testing the ovl-fsnotify interaction, so we can defer
that step to later.

I wanted to post this series earlier to give more time for fsdevel
feedback and if these patches get your blessing and the blessing of
vfs maintainers, it is probably better that they will go through the
vfs tree.

I've tested that overlay "fake" path are still shown in /proc/self/maps
and in the /proc/self/exe and /proc/self/map_files/ symlinks.

The audit and tomoyo use of file_fake_path() is not tested
(CC maintainers), but they both look like user displayed paths,
so I assumed they's want to preserve the existing behavior
(i.e. displaying the fake overlayfs path).

Thanks,
Amir.

[1] https://github.com/amir73il/linux/commits/ovl_fake_path

Amir Goldstein (3):
  fs: use fake_file container for internal files with fake f_path
  fs: use file_fake_path() to get path of mapped files for display
  fs: store fake path in file_fake along with real path

 fs/cachefiles/namei.c  |  2 +-
 fs/file_table.c        | 85 ++++++++++++++++++++++++++++++++++--------
 fs/internal.h          |  5 ++-
 fs/namei.c             |  2 +-
 fs/open.c              |  9 +++--
 fs/overlayfs/file.c    |  2 +-
 fs/proc/base.c         |  8 ++--
 fs/seq_file.c          |  2 +-
 include/linux/fs.h     | 13 ++++---
 kernel/audit.c         |  3 +-
 kernel/fork.c          |  5 ++-
 security/tomoyo/util.c |  3 +-
 12 files changed, 102 insertions(+), 37 deletions(-)

-- 
2.34.1