[PATCH v3 0/5] ovl: constant inode numbers (cont.)

[Amir Goldstein <amir73il@gmail.com>]

Miklos,

This series covers many of the constant inode number leftovers from v4.12.

Current status is:
- For non-hardlinks, st_ino is constant and consistent with d_ino
- For samefs and for non-dir, st_ino/d_ino is also persistent
- For samefs, st_dev;st_ino is also system-wide unique

The remaining leftovers:
- Constant st_ino/d_ino for hardlinks (WIP by me)
- System-wide unique st_dev;st_ino for non-samefs (WIP by Chandan?)

Tested constant and consistent d_ino with improved xfstest overlay/017,
already upstream, which currently fails only on the hardlink copy up test.

v3:
- Relax same fs contrains from v4.12
- Non "impure" dir optimizations

v2:
- Lookup overlay entry with lookup_one_len_noperm()

v1:
- Resurect Miklos's constant d_ino POC
- Lookup overlay entry with lookup_one_len()

Amir Goldstein (5):
  ovl: relax same fs constrain for ovl_check_origin()
  ovl: relax same fs constrain for constant st_ino
  vfs: factor out lookup_one_len_init()
  vfs: add helper lookup_one_len_noperm()
  ovl: consistent st_ino/d_ino

 fs/namei.c               | 117 +++++++++++++++++++++++------------------
 fs/overlayfs/inode.c     |  32 +++++++-----
 fs/overlayfs/namei.c     |  50 +++++++++++-------
 fs/overlayfs/overlayfs.h |   2 +-
 fs/overlayfs/readdir.c   | 133 ++++++++++++++++++++++++++++++++++++++++++++---
 include/linux/namei.h    |   1 +
 6 files changed, 244 insertions(+), 91 deletions(-)

-- 
2.7.4