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    SubjectRe: [patch] implement smarter atime updates support
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    > +static int relatime_need_update(struct inode *inode, struct timespec now)
    > +{
    > + /*
    > + * Is mtime younger than atime? If yes, update atime:
    > + */
    > + if (timespec_compare(&inode->i_mtime, &inode->i_atime) >= 0)
    > + return 1;
    > + /*
    > + * Is ctime younger than atime? If yes, update atime:
    > + */
    > + if (timespec_compare(&inode->i_ctime, &inode->i_atime) >= 0)
    > + return 1;
    > +
    > + /*
    > + * Is the previous atime value older than a day? If yes,
    > + * update atime:
    > + */
    > + if ((long)(now.tv_sec - inode->i_atime.tv_sec) >= 24*60*60)
    > + return 1;


    you might want to add

    /*
    * if the inode is dirty already, do the atime update since
    * we'll be doing the disk IO anyway to clean the inode.
    */
    if (inode->i_state & I_DIRTY)
    return 1;


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