lkml.org 
[lkml]   [2007]   [Feb]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] update ctime and mtime for mmaped write
From
Date
> > > > This flag is checked in msync() and __fput(), and if set, the file
> > > > times are updated and the flag is cleared
> > >
> > > Why not also check inside vfs_getattr?
> >
> > This is the minimum, that the standard asks for.
> >
> > Note, your porposal would touch the times in vfs_getattr(), which
> > means, that the modification times would depend on the time of the
> > last stat() call, which is not really right, though it would still be
> > conforming.
> >
> > It is much saner, if the modification time is always the time of the
> > last write() or msync().
>
> I disagree. The above doesn't allow a program like 'make' to discover
> whether or not the file has changed by simply calling stat(). Instead,
> you're forcing a call to msync()+stat().

Yes, but that's the only portable way _anyway_.

And it probably doesn't matter, programs using mmap to write to a file
_will_ call msync, or at least close the file, when they're done.

Thanks,
Miklos
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-02-21 19:55    [W:0.037 / U:0.136 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site