Re: CONFIG_VFAT_FS_DUALNAMES regression

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To: Jan Engelhardt <jengelh@...>
Cc: Theodore Tso <tytso@...>, Alan Cox <alan@...>, Rusty Russell <rusty@...>, Pavel Machek <pavel@...>, OGAWA Hirofumi <hirofumi@...>, <john.lanza@...>, Linux Kernel Mailing List <linux-kernel@...>, <linux-fsdevel@...>, Dave Kleikamp <shaggy@...>, <corbet@...>, <jcm@...>
Date: Thursday, July 2, 2009 - 9:26 pm

Hi Jan,

> The mount(8) manpage becomes pretty ambiguous with the dualnames
> patch.

yes, the man page will need an update certainly.

> Making WINNT the default would cause many a `ls` output to just
> scream at me in uppercaps because there are programs that
> create long names with all-uppers.

well, you could also argue that having WINNT in effect does the
'correct' thing. It causes ls to display the name that is actually in
the filesystem.

I think the current default for VFAT on Linux is rather misleading. It
always displays 8.3 names as lowercase, so MAIL.dat, foo.TXT and other
combinations always display as lowercase, regardless of what the
application that created the file chose for the name.

With the winnt option the names are shown as the application that
created them chose. That is also what all current versions of Windows
do as far as I know.

yes, this means that for a digital camera card, where the camera is
always choosing all uppercase for the filenames, it can look like
'shouting' on a Linux system where lowercase is more usual. It is
however an accurate representation and maximises compatibility.

I think the current defaults were chosen a long time ago, when Win95
was more the norm, and 16 bit apps that weren't written for case
preserving filesystems were common. That era is long gone.

> shortname really needs to be split into "shortname that is applied
> during creation" and "shortname that is applied upon readdir".

perhaps, but I think (as you discovered!) the current VFAT options are
already too complex, and very few people set them correctly. Adding
more options to get yet more varients to the case handling behaviour
doesn't seem like a good move to me.

Other OSes with FAT implementations just choose a sane default (which
probably matches our shortname=winnt pretty closely) and the user
never gets to choose. Choice isn't always a good thing!

I should also point out that if we followed Alan's reasoning then we'd
have to actually make all these options separate filesystems, and we'd
only be able to call the shortname=winnt one "VFAT" as that is the
only one that matches Windows behaviour. The others all treat the
filesystem differently to what Windows does. (no, I'm not seriously
proposing this, just pointing out that the "it has to be a different
filesystem name" has not been always applied previously).

I wonder if Pavel still thinks that VFAT was perfect before I came
along :-)

Cheers, Tridge
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Messages in current thread:
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Pavel Machek, (Tue Jun 30, 2:31 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Pavel Machek, (Thu Jul 2, 6:00 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Pavel Machek, (Thu Jul 2, 6:41 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Boaz Harrosh, (Wed Jul 1, 7:48 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, James Bottomley, (Wed Jul 1, 11:44 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Jamie Lokier, (Mon Jul 6, 4:41 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Boaz Harrosh, (Tue Jul 7, 6:02 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Jamie Lokier, (Tue Jul 7, 7:25 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Boaz Harrosh, (Tue Jul 7, 7:48 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Pavel Machek, (Thu Jul 2, 6:03 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Alan Cox, (Wed Jul 1, 10:41 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, James Bottomley, (Thu Jul 2, 10:56 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, James Bottomley, (Thu Jul 2, 5:25 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Theodore Tso, (Thu Jul 2, 11:27 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Alan Cox, (Thu Jul 2, 12:56 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, OGAWA Hirofumi, (Thu Jul 2, 10:50 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Rusty Russell, (Wed Jul 1, 6:49 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Pavel Machek, (Thu Jul 2, 5:46 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Rusty Russell, (Thu Jul 2, 7:55 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Pavel Machek, (Thu Jul 2, 6:33 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Pavel Machek, (Thu Jul 2, 6:44 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Rusty Russell, (Thu Jul 2, 8:03 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Pavel Machek, (Wed Jul 8, 5:21 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, H. Peter Anvin, (Wed Jul 8, 12:46 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Paul E. McKenney, (Wed Jul 8, 10:25 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Paul E. McKenney, (Wed Jul 8, 6:14 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Paul E. McKenney, (Wed Jul 8, 7:59 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Rusty Russell, (Wed Jul 1, 8:34 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Theodore Tso, (Wed Jul 1, 10:05 am)
Re: CONFIG_VFAT_FS_DUALNAMES regression, Jan Engelhardt, (Thu Jul 2, 7:17 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Thu Jul 2, 7:46 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, OGAWA Hirofumi, (Thu Jul 2, 8:58 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Thu Jul 2, 9:50 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Thu Jul 2, 10:09 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Fri Jul 3, 5:40 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jamie Lokier, (Mon Jul 6, 4:04 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jamie Lokier, (Fri Jul 10, 5:44 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Mon Jul 6, 7:40 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Pavel Machek, (Tue Jul 7, 3:51 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Pavel Machek, (Fri Jul 10, 3:35 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Wed Jul 8, 6:27 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Thu Jul 9, 4:24 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Mon Jul 6, 2:55 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Mon Jul 6, 4:36 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Martin Steigerwald, (Tue Jul 7, 5:56 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Martin Steigerwald, (Wed Jul 8, 7:39 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jamie Lokier, (Fri Jul 10, 5:28 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jamie Lokier, (Fri Jul 10, 10:03 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Pavel Machek, (Fri Jul 10, 3:36 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jamie Lokier, (Fri Jul 10, 5:12 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Martin Steigerwald, (Thu Jul 9, 3:47 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Martin Steigerwald, (Thu Jul 9, 9:34 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jamie Lokier, (Wed Jul 8, 9:53 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jeremy Allison, (Wed Jul 8, 1:12 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Alan Cox, (Wed Jul 8, 6:04 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, James Bottomley, (Wed Jul 8, 11:27 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Alan Cox, (Wed Jul 8, 11:37 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, James Bottomley, (Wed Jul 8, 12:06 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Alan Cox, (Wed Jul 8, 12:18 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, OGAWA Hirofumi, (Thu Jul 9, 12:53 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, OGAWA Hirofumi, (Sun Jul 12, 3:39 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Pavel Machek, (Tue Jul 21, 6:31 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Pavel Machek, (Sat Aug 8, 8:19 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Boaz Harrosh, (Tue Jul 21, 5:16 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, John Lanza, (Tue Jul 21, 11:06 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, John Lanza, (Tue Jul 21, 3:38 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Tue Jul 21, 6:44 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Pavel Machek, (Tue Jul 21, 6:31 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Pavel Machek, (Tue Jul 21, 5:37 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, John Lanza, (Tue Jul 21, 11:08 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, John Lanza, (Tue Jul 21, 3:36 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Alan Cox, (Thu Jul 9, 5:53 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Alan Cox, (Thu Jul 9, 5:51 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, OGAWA Hirofumi, (Thu Jul 9, 1:27 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Pavel Machek, (Thu Jul 9, 3:21 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, David Newall, (Thu Jul 9, 3:34 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Wed Jul 8, 8:23 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Alan Cox, (Wed Jul 8, 8:02 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Alan Cox, (Wed Jul 8, 9:25 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Alan Cox, (Thu Jul 9, 5:42 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, James Bottomley, (Thu Jul 9, 9:59 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Alan Cox, (Thu Jul 9, 10:10 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Theodore Tso, (Thu Jul 9, 11:25 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Alan Cox, (Thu Jul 9, 8:09 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Christoph Hellwig, (Thu Jul 9, 1:15 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, David Newall, (Thu Jul 9, 4:57 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Martin Steigerwald, (Thu Jul 9, 6:23 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, David Newall, (Thu Jul 9, 9:45 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Martin Steigerwald, (Fri Jul 10, 2:49 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, David Newall, (Sun Jul 12, 4:52 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jonathan Corbet, (Fri Jul 10, 3:31 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Alan Cox, (Fri Jul 10, 5:14 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Bartlomiej Zolnierkiewicz..., (Fri Jul 10, 4:40 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jörn, (Sun Jul 12, 7:21 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Sun Jul 12, 7:27 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jamie Lokier, (Mon Jul 13, 6:20 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Mon Jul 13, 6:32 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Martin Steigerwald, (Tue Jul 7, 6:09 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jamie Lokier, (Mon Jul 6, 4:58 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Mon Jul 6, 5:08 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jamie Lokier, (Mon Jul 6, 6:24 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Tue Jul 7, 5:36 am)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jan Engelhardt, (Mon Jul 6, 4:42 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, David Newall, (Mon Jul 6, 12:17 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, Jamie Lokier, (Mon Jul 6, 3:33 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, OGAWA Hirofumi, (Fri Jul 3, 11:09 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regressions, OGAWA Hirofumi, (Fri Jul 3, 2:46 am)
Re: CONFIG_VFAT_FS_DUALNAMES regression, Jan Engelhardt, (Thu Jul 2, 8:11 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regression, Jan Engelhardt, (Thu Jul 2, 9:10 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regression, , (Thu Jul 2, 9:26 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regression, Jan Engelhardt, (Thu Jul 2, 9:58 pm)
Re: CONFIG_VFAT_FS_DUALNAMES regression, Jamie Lokier, (Fri Jul 10, 8:14 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Stefan Richter, (Wed Jul 1, 12:18 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Alan Cox, (Wed Jul 1, 10:17 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Jamie Lokier, (Mon Jul 6, 3:57 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Pavel Machek, (Thu Jul 2, 5:49 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Eric W. Biederman, (Sat Jun 27, 9:54 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Eric W. Biederman, (Sun Jun 28, 12:10 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, OGAWA Hirofumi, (Sun Jun 28, 2:25 am)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, OGAWA Hirofumi, (Mon Jun 29, 7:36 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, OGAWA Hirofumi, (Mon Jun 29, 8:55 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Eric W. Biederman, (Sun Jun 28, 3:51 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, James Bottomley, (Sun Jun 28, 4:13 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Eric W. Biederman, (Sun Jun 28, 4:45 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, James Bottomley, (Sun Jun 28, 5:45 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Jan Engelhardt, (Sat Jun 27, 1:21 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Jamie Lokier, (Sun Jun 28, 5:57 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Jan Engelhardt, (Sun Jun 28, 6:02 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Jamie Lokier, (Sun Jun 28, 6:05 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, OGAWA Hirofumi, (Fri Jun 26, 9:56 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, H. Peter Anvin, (Fri Jun 26, 5:40 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, OGAWA Hirofumi, (Fri Jun 26, 9:48 pm)
Re: [PATCH] Added CONFIG_VFAT_FS_DUALNAMES option, Jan Engelhardt, (Sat Jun 27, 1:26 pm)