Re: o_sync in vfat driver

[Chris Mason]

On Wednesday 01 March 2006 20:15, OGAWA Hirofumi wrote:

> > Just to make sure we're using the same terms, do you mean the pages are
> > marked dirty and on the SB's dirty list, or do you mean the page has been
> > through writepage and is currently on its way to the disk?
>
> The page is already on device's request queue, and the page is already
> marked a PG_writeback. And that page is not processed by device yet.
>
> Then, you call next filemap_fdatawrite(), it just re-dirty the page
> and queues to sb->s_dirty, because the page's buffer_heads is still
> locked.  So, the re-dirtyed page is re-submited to device by
> periodically wb_kupdate()?

filemap_fdatawrite() won't redirty the page.  It will wait on the pending 
writeback.

-chris
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