svn commit: r250193 - head/sys/fs/msdosfs

[Konstantin Belousov]

On Fri, May 03, 2013 at 11:55:47AM -0400, John Baldwin wrote:
> On Thursday, May 02, 2013 4:00:11 pm Konstantin Belousov wrote:
> > Author: kib
> > Date: Thu May  2 20:00:11 2013
> > New Revision: 250193
> > URL: http://svnweb.freebsd.org/changeset/base/250193
> > 
> > Log:
> >   The fsync(2) call should sync the vnode in such way that even after
> >   system crash which happen after successfull fsync() return, the data
> >   is accessible.  For msdosfs, this means that FAT entries for the file
> >   must be written.
> >   
> >   Since we do not track the FAT blocks containing entries for the
> >   current file, just do a sloppy sync of the devvp vnode for the mount,
> >   which buffers, among other things, contain FAT blocks.
...

> Does this fix kern/62762?
> 

Supposedly yes, I even possibly have seen this PR before.
At least, it is understandable why do you remember about it now.

I definitely do not want to take the approach of precisely calculating
the list of FAT blocks which needs to be synced.
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