[git pull] mount fixes

[Al Viro <viro@zeniv.linux.org.uk>]

(collected *-by and slightly cleaned the text in commit message of [3/4]; otherwise
identical to what had been posted and sat in #fixes)

The following changes since commit 8742b2d8935f476449ef37e263bc4da3295c7b58:

  Merge tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs (2025-08-12 12:10:33 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git tags/pull-fixes

for you to fetch changes up to fb924b7b8669503582e003dd7b7340ee49029801:

  change_mnt_propagation(): calculate propagation source only if we'll need it (2025-08-19 12:05:59 -0400)

----------------------------------------------------------------
fixes for several recent mount-related regressions

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

----------------------------------------------------------------
Al Viro (4):
      fix the softlockups in attach_recursive_mnt()
      propagate_umount(): only surviving overmounts should be reparented
      use uniform permission checks for all mount propagation changes
      change_mnt_propagation(): calculate propagation source only if we'll need it

 fs/namespace.c | 41 ++++++++++++++++++++++-------------------
 fs/pnode.c     | 10 ++++++----
 2 files changed, 28 insertions(+), 23 deletions(-)