we still have embedded dynlock in all ldiskfs_inodes which takes extra 24 bytes (actually 28 bytes because it's not 8 bytes aligned), however, the only use-case now is for IAM container, so we should:

• remove dynlock patch and move it into osd-ldiskfs
• add a new field for iam_container::ic_lock

It's too late to have this for 2.3, but we should do this at least for the next release.