On Thu, 2007-04-05 at 04:08 +0200, Nick Piggin wrote:
> On Wed, Apr 04, 2007 at 04:32:24PM -0700, Badari Pulavarty wrote:
> > On Wed, 2007-04-04 at 16:17 -0700, Mark Fasheh wrote:
> > > On Wed, Apr 04, 2007 at 04:05:19PM -0700, Badari Pulavarty wrote:
> > > > Hmm.. Okay, only filesystems that could return AOP_TRUNCATED_PAGE
> > > > are ocf2 and gfs2. Now that both of them are switched to have
> > > > write_begin()/write_end(), why do we need this code to handle
> > > > AOP_TRUNCATED_PAGE (in the else part) ? Can't we just cleanup/nuke
> > > > all the AOP_TRUNCATED_PAGE handling ?
> > >
> > > We don't - I'm pretty sure that fs-no-AOP_TRUNCATED_PAGE.patch gets rid of
> > > them.
> > > --Mark
> >
> > It didn't, completely get rid of them :(
>
> ->readpage can still return AOP_TRUNCATED_PAGE. Were there any from
> prepare_write or commit_write still around?
>
>
Not a big deal. But trying to understand it better.
int pagecache_write_begin()
{
if (aops->write_begin) {
return aops->write_begin(file, mapping, pos, len, flags,
pagep, fsdata);
} else {
.....
ret = aops->readpage(file, page);
page_cache_release(page);
if (ret) {
if (ret == AOP_TRUNCATED_PAGE)
goto again;
return ret;
}
goto again;
....
}
}
filesystems (ocfs2, gfs2) which can return AOP_TRUNCATED_PAGE for
prepare_write or readpage would never come to this case. They
have write_begin() method set. Isn't it ? Why this check ?
Thanks,
Badari
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