Merge tag 'vfs-6.19-rc1.ovl' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull overlayfs cred guard conversion from Christian Brauner:
 "This converts all of overlayfs to use credential guards, eliminating
  manual credential management throughout the filesystem.

  Credential guard conversion:

   - Convert all of overlayfs to use credential guards, replacing the
     manual ovl_override_creds()/ovl_revert_creds() pattern with scoped
     guards.

     This makes credential handling visually explicit and eliminates a
     class of potential bugs from mismatched override/revert calls.

     (1) Basic credential guard (with_ovl_creds)
     (2) Creator credential guard (ovl_override_creator_creds):

         Introduced a specialized guard for file creation operations
         that handles the two-phase credential override (mounter
         credentials, then fs{g,u}id override). The new pattern is much
         clearer:

         with_ovl_creds(dentry->d_sb) {
                 scoped_class(prepare_creds_ovl, cred, dentry, inode, mode) {
                         if (IS_ERR(cred))
                                 return PTR_ERR(cred);
                         /* creation operations */
                 }
         }

     (3) Copy-up credential guard (ovl_cu_creds):

         Introduced a specialized guard for copy-up operations,
         simplifying the previous struct ovl_cu_creds helper and
         associated functions.

         Ported ovl_copy_up_workdir() and ovl_copy_up_tmpfile() to this
         pattern.

  Cleanups:

   - Remove ovl_revert_creds() after all callers converted to guards

   - Remove struct ovl_cu_creds and associated functions

   - Drop ovl_setup_cred_for_create() after conversion

   - Refactor ovl_fill_super(), ovl_lookup(), ovl_iterate(),
     ovl_rename() for cleaner credential guard scope

   - Introduce struct ovl_renamedata to simplify rename handling

   - Don't override credentials for ovl_check_whiteouts() (unnecessary)

   - Remove unneeded semicolon"

* tag 'vfs-6.19-rc1.ovl' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (54 commits)
  ovl: remove unneeded semicolon
  ovl: remove struct ovl_cu_creds and associated functions
  ovl: port ovl_copy_up_tmpfile() to cred guard
  ovl: mark *_cu_creds() as unused temporarily
  ovl: port ovl_copy_up_workdir() to cred guard
  ovl: add copy up credential guard
  ovl: drop ovl_setup_cred_for_create()
  ovl: port ovl_create_or_link() to new ovl_override_creator_creds cleanup guard
  ovl: mark ovl_setup_cred_for_create() as unused temporarily
  ovl: reflow ovl_create_or_link()
  ovl: port ovl_create_tmpfile() to new ovl_override_creator_creds cleanup guard
  ovl: add ovl_override_creator_creds cred guard
  ovl: remove ovl_revert_creds()
  ovl: port ovl_fill_super() to cred guard
  ovl: refactor ovl_fill_super()
  ovl: port ovl_lower_positive() to cred guard
  ovl: port ovl_lookup() to cred guard
  ovl: refactor ovl_lookup()
  ovl: port ovl_copyfile() to cred guard
  ovl: port ovl_rename() to cred guard
  ...

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