Merge patch series "Change inode_operations.mkdir to return struct dentry *"

NeilBrown <neilb@suse.de> says:

This revised series contains a few clean-ups as requested by various
people but no substantial changes.

I reviewed the mkdir functions in many (all?) filesystems and found a
few that use d_instantiate() on an unlocked inode (after
unlock_new_inode()) and also support export_operations. These could
potentially call d_instantiate() on a directory inode which is already
attached to a dentry, though making that happen would usually require
guessing the filehandle correctly. I haven't tried to address those
here, (this patch set doesn't make that situation any worse) but I may
in the future.

* patches from https://lore.kernel.org/r/20250227013949.536172-2-neilb@suse.de:
  VFS: Change vfs_mkdir() to return the dentry.
  nfs: change mkdir inode_operation to return alternate dentry if needed.
  fuse: return correct dentry for ->mkdir
  ceph: return the correct dentry on mkdir
  hostfs: store inode in dentry after mkdir if possible.
  Change inode_operations.mkdir to return struct dentry *

Link: https://lore.kernel.org/r/20250227013949.536172-2-neilb@suse.de
Signed-off-by: Christian Brauner <brauner@kernel.org>