Re: which dentry a page belongs to

[Jan Hudec <bulb@ucw.cz>]

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On Sat, Apr 24, 2004 at 10:20:56 +0100, Christoph Hellwig wrote:
> On Sat, Apr 24, 2004 at 10:44:46AM +0200, Jan Hudec wrote:
> > On Fri, Apr 23, 2004 at 17:37:38 +0100, Christoph Hellwig wrote:
> > > in 2.4 writepage is always the result of data dirtied by mmap.  In 2.6 it's
> > > also for use for data dirtied by write.  Even in 2.4 there's no gurantee
> > > the mapping that dirtied the page still exists when the page is written out
> > > by the VM.
> > 
> > No, It's the same in 2.4 and 2.6 -- both may use writepage for write
> > (depends on how you implement your commit_write).
> 
> Well, okay.  At least xfs uses writepage and some network filesystems do
> aswell.  The filesystems using generic fs/buffer.c routines don't use
> writepage at least..

Looked at ext2 code... OK, in 2.4 the generic_commit_write goes right to
buffer cache. So filesystems using it do not use writepage. But
filesystems may set_page_dirty in commit_write and that would mean
writepage.

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						 Jan 'Bulb' Hudec <bulb@ucw.cz>

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