Re: [PATCH v7 05/12] fs: allow to always dirty inode in __generic_write_end

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2018-06-04 14:48 GMT+02:00 Christoph Hellwig <hch@xxxxxx>:
> On Mon, Jun 04, 2018 at 02:37:22PM +0200, Andreas Gruenbacher wrote:
>> @@ -2106,7 +2105,7 @@ int __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
>>        * ordering of page lock and transaction start for journaling
>>        * filesystems.
>>        */
>> -     if (i_size_changed)
>> +     if (dirty_inode)
>>               mark_inode_dirty(inode);
>>       return copied;
>
> Calling mark_inode_dirty on an already dirty inode is cheap, so how
> about just calling it directly in your caller that always wants to
> set the inode dirty?

The dirty_inode hook is where gfs2 converts the in-core inode into the
on-disk format (the equivalent of xfs_inode_to_disk), so it's not
quite that cheap. I realize this could be done differently in gfs2,
but that's not where we stand today, and I really can't fix ten things
all at the same time.

Thanks,
Andreas



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