[GIT PULL] overlayfs fixes for 7.0-rc6

[Amir Goldstein <amir73il@gmail.com>]

Hi Linus,

Please pull overlayfs fixes for 7.0-rc6 to fix two regressions
from v6.7 (minor impact) and from v6.12 (major performance impact).

This branch has been sitting in linux-next for a couple of day and
it has gone through the usual overlayfs test routines.

The branch merges cleanly with master branch of the moment.

Thanks,
Amir.

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The following changes since commit f338e77383789c0cae23ca3d48adcc5e9e137e3c:

  Linux 7.0-rc4 (2026-03-15 13:52:05 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs.git ovl-fixes-7.0-rc6

for you to fetch changes up to 1f6ee9be92f8df85a8c9a5a78c20fd39c0c21a95:

  ovl: make fsync after metadata copy-up opt-in mount option (2026-03-27 12:48:10 +0100)

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overlayfs fixes for 7.0-rc6:

- Fix regression in 'xino' feature detection.
  I clumsily introduced this regression myself when working on another
  subsystem (fsnotify).  Both the regression and the fix have almost
  no visible impact on users except for some kmsg prints.

- Fix to performance regression in v6.12.
  This regression was reported by Google GOC developers.
  It is not uncommon these days for the year-old mature LTS to
  get adopted by distros and get exposed to many new workloads.
  We made a sub-smart move of making a behavior change in v6.12
  which could impact performance, without making it opt-in.
  Fixing this mistake retroactively, to be picked by LTS.

----------------------------------------------------------------
Amir Goldstein (1):
      ovl: fix wrong detection of 32bit inode numbers

Fei Lv (1):
      ovl: make fsync after metadata copy-up opt-in mount option

 Documentation/filesystems/overlayfs.rst | 50 +++++++++++++++++++++++++++++++++
 fs/overlayfs/copy_up.c                  |  6 ++--
 fs/overlayfs/overlayfs.h                | 21 ++++++++++++++
 fs/overlayfs/ovl_entry.h                |  7 +----
 fs/overlayfs/params.c                   | 33 ++++++++++++++++++----
 fs/overlayfs/super.c                    |  2 +-
 fs/overlayfs/util.c                     |  5 +++-
 7 files changed, 108 insertions(+), 16 deletions(-)