On Wed, Mar 25, 2020 at 02:20:57AM -0700, Christoph Hellwig wrote:
> >     spin_unlock(&inode->i_lock);
> >  
> > -   if (dirty & I_DIRTY_TIME)
> > -           mark_inode_dirty_sync(inode);
> > +   /* This was a lazytime expiration; we need to tell the file system */
> > +   if (dirty & I_DIRTY_TIME_EXPIRED && inode->i_sb->s_op->dirty_inode)
> > +           inode->i_sb->s_op->dirty_inode(inode, I_DIRTY_SYNC);
> 
> I think this needs a very clear comment explaining why we don't go
> through __mark_inode_dirty.

I can take the explanation which is in the git commit description and
move it into the comment.

> But as said before I'd rather have a new lazytime_expired operation that
> makes it very clear what is happening.  We currenly have 4 file systems
> (ext4, f2fs, ubifs and xfs) that support lazytime, so this won't really
> be a major churn.

Again, I believe patch #2 does what you want; if it doesn't can you
explain why passing I_DIRTY_TIME_EXPIRED to s_op->dirty_inode() isn't
"a new lazytime expired operation that makes very clear what is
happening"?

I separated out patch #1 and patch #2 because patch #1 preserves
current behavior, and patch #2 modifies XFS code, which I don't want
to push Linus without an XFS reviewed-by.

N.b.  None of the other file systems required a change for patch #2,
so if you want, we can have the XFS tree carry patch #2, and/or
combine that with whatever other simplifying changes that you want.
Or I can combine patch #1 and patch #2, with an XFS Reviewed-by, and
send it through the ext4 tree.

What's your pleasure?

                                        - Ted



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