You can set inode size to any one of 512, 1024, 2048 or 4096 when you mmcrfs. Try it on a test system.
You want all the metadata of a file to fit into the inode. Also small files, and small directories, can be stored in their inodes. On a test file system you can examine how much of an inode is occupied with which data and metadata using the inode subcommand of the tsdbfs command. (Root only, and usual cautions -- use only to look, if you make a mistake patching - I told you not to do that!) inode number of any path is easily discovered with the standard ls -ild pathname command
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