On 11/25/2014 06:33 AM, Theodore Ts'o wrote:
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I was concerned about putting them on the dirty inode list because it
would be extra inodes for the writeback threads would have to skip
over and ignore (since they would not be dirty in the inde or data
pages sense).

Another solution would be to use a separate linked list for dirtytime
inodes, but that means adding some extra fields to the inode
structure, which some might view as bloat.  

You could use the same list-head for both lists. 

If the inode is on the dirty-inode-list then no need to add it
to the list-for-dirtytime, it will be written soon anyway.
else you add it to the list-for-dirtytime.

If you (real)dirty an inode then you first remove it from the
list-for-dirtytime first, and then add it to the dirty-inode-list.

So at each given time it is only on one list

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Cheers
Boaz