[PATCH v3 0/4] overlayfs lock ordering changes

[Amir Goldstein <amir73il@gmail.com>]

Hi Miklos,

I went for the less intrusive approach of holding mnt_writers
only throughout copy up instead of a long lived elevated refcount.
We could reconsider the long lived reference in the future.

Thanks,
Amir.

Changes since v2:
- Separate mnt_writers and sb_writers locks during copy up
- Fixs error handling bugs found by Miklos

Changes since v1:
- Breakup the large ovl_want_write() transaction in copy up
- Add fix to possible deadlock with encode lower ovl fh

Amir Goldstein (4):
  ovl: reorder ovl_want_write() after ovl_inode_lock()
  ovl: split ovl_want_write() into two helpers
  ovl: do not open/llseek lower file with upper sb_writers held
  ovl: do not encode lower fh with upper sb_writers held

 fs/overlayfs/copy_up.c   | 141 +++++++++++++++++++++++++--------------
 fs/overlayfs/dir.c       |  60 ++++++++---------
 fs/overlayfs/export.c    |   7 +-
 fs/overlayfs/inode.c     |  57 ++++++++--------
 fs/overlayfs/namei.c     |  37 +++++++---
 fs/overlayfs/overlayfs.h |  30 +++++++--
 fs/overlayfs/super.c     |  20 ++++--
 fs/overlayfs/util.c      |  73 ++++++++++++++++++--
 8 files changed, 275 insertions(+), 150 deletions(-)

-- 
2.34.1