Re: [Q] FAT driver enhancement

[Jens Axboe]

On Tue, Apr 02 2002, Mike Fedyk wrote:
> On Tue, Apr 02, 2002 at 10:27:52PM +0900, OGAWA Hirofumi wrote:
> > Helge Hafting <[e-mail]> writes:
> > 
> > > OGAWA Hirofumi wrote:
> > > > 
> > > > Jos Hulzink <[e-mail]> writes:
> > > > > Questions:
> > > > >
> > > > > 1) How do you think about the checking of the FAT tables ? It definitely
> > > > >    will slow down the mount.
> > > > 
> > > > Unfortunately if FAT table has bad sector, FAT tables may not be the
> > > > same.
> > > 
> > > And then you don't want to mount unless you know what you
> > > are doing.  And those knowing what they are doing can be bothered
> > > to use some kind of "force" option in this case.  Or perhaps an
> > > option that selects which FAT to trust.
> > 
> > I mean I/O error, not data damage.
> 
> It is the block layer's responsibility to retry such soft errors and recover.

No it's the low level driver

> Probably the best you can do, is retry the read a few times if there
> is an error reported, and then fail if it persists.

I/O error retrying from the fs is a bad idea, the low level driver
should already have exhausted the possibilities to recover the data. If
the fs receives an I/O error, that's the final result and retrying
would serve no sane purpose.

-- 
Jens Axboe