Merge patch series "kernfs: three standalone fixes"

Shakeel Butt <shakeel.butt@linux.dev> says:

Three independent kernfs fixes, plus selftest coverage for the paths
they touch.  The fixes do not depend on each other.

Patch 1 adds tests for decoding a file handle and for a rename that
keeps the same parent.  Patches 2-4:

 - kernfs_rename_ns() takes kernfs_rename_lock only when the parent
   changes, so two same-parent renames inside one
   kernfs_path_from_node() walk can build a path that never existed.
   sysfs_warn_dup() is the only caller that can see it.

 - __kernfs_fh_to_dentry() creates inodes with no lock, so a decode
   racing rmdir() can hash an inode after the removal's ilookup()
   pass.  The inode keeps i_nlink 1, so no IN_DELETE_SELF is sent.

 - kernfs_create_link() reads the target's uid and gid unlocked, so a
   chown in between gives the link an owner the target never had.

Patch 1 applies on top of the patch [1] ("selftests: cover kernfs
dentry revalidation") with vfs-7.4.kernfs branch in vfs tree as base.

[1] http://lore.kernel.org/20260902014050.499002-1-shakeel.butt@linux.dev

* patches from https://patch.msgid.link/20260905191613.3143937-1-shakeel.butt@linux.dev:
  kernfs: fix up the unlocked attribute reads on the creation paths
  kernfs: don't lose IN_DELETE_SELF when decoding a file handle
  kernfs: take kernfs_rename_lock for same-parent renames too
  selftests: cover kernfs file handles and same-parent rename

Link: https://patch.msgid.link/20260905191613.3143937-1-shakeel.butt@linux.dev
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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