* MS_SILENT vs. vfat and hfs
@ 2011-03-02 11:45 Karel Zak
2011-03-02 14:14 ` OGAWA Hirofumi
0 siblings, 1 reply; 6+ messages in thread
From: Karel Zak @ 2011-03-02 11:45 UTC (permalink / raw)
To: linux-kernel; +Cc: t.artem, OGAWA Hirofumi, Roman Zippel
The mount(8) command uses "quiet" mount option as a synonym to the
MS_SILENT mount flag (since util-linux 2.7, Aug 1997).
It means than on systems where is properly defined the MS_SILENT
mount flags in headers is the "quiet" mount option always translated
to the MS_SILENT mount flags and "quiet" string is never send to FS
drivers.
$ strace -e mount mount -o quiet /dev/sdb1 /mnt/test
mount("/dev/sdb1", "/mnt/test", "vfat", MS_MGC_VAL|MS_SILENT, NULL) = 0
^^^^^^^^^
Unfortunately,
$ grep -r \"quiet\" *
fat/inode.c: {Opt_quiet, "quiet"},
hfs/super.c: { opt_quiet, "quiet" },
vfat and hfs drivers use "quiet" as a mount option. That's bug.
There should not be a collision between mount(8) mount options and
filesystem specific mount options.
My suggestion is to fix the fat and hfs code to use something other
than "quiet" (shutup, noisless, ...). I think you don't have to care
about backward compatibility, because it's probably broken for years.
Karel
--
Karel Zak <kzak@redhat.com>
http://karelzak.blogspot.com
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: MS_SILENT vs. vfat and hfs
2011-03-02 11:45 MS_SILENT vs. vfat and hfs Karel Zak
@ 2011-03-02 14:14 ` OGAWA Hirofumi
2011-03-02 14:43 ` Karel Zak
0 siblings, 1 reply; 6+ messages in thread
From: OGAWA Hirofumi @ 2011-03-02 14:14 UTC (permalink / raw)
To: Karel Zak; +Cc: linux-kernel, t.artem, Roman Zippel
Karel Zak <kzak@redhat.com> writes:
> The mount(8) command uses "quiet" mount option as a synonym to the
> MS_SILENT mount flag (since util-linux 2.7, Aug 1997).
>
> It means than on systems where is properly defined the MS_SILENT
> mount flags in headers is the "quiet" mount option always translated
> to the MS_SILENT mount flags and "quiet" string is never send to FS
> drivers.
>
> $ strace -e mount mount -o quiet /dev/sdb1 /mnt/test
> mount("/dev/sdb1", "/mnt/test", "vfat", MS_MGC_VAL|MS_SILENT, NULL) = 0
> ^^^^^^^^^
>
> Unfortunately,
>
> $ grep -r \"quiet\" *
>
> fat/inode.c: {Opt_quiet, "quiet"},
> hfs/super.c: { opt_quiet, "quiet" },
>
> vfat and hfs drivers use "quiet" as a mount option. That's bug.
>
> There should not be a collision between mount(8) mount options and
> filesystem specific mount options.
>
> My suggestion is to fix the fat and hfs code to use something other
> than "quiet" (shutup, noisless, ...). I think you don't have to care
> about backward compatibility, because it's probably broken for years.
No. Actually the _new_ option is MS_SILENT. In history, there was no
MS_SILENT (it was called MS_VERBOSE) in kernel, then _added_ newly, and
never be enabled MS_SILENT in mount command until that.
So, my suggestion is use "silent" (or something) as MS_SILENT for
backward compatibility. Because the "quiet" is already hardcoded by some
userland apps for vfat.
Thanks.
--
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: MS_SILENT vs. vfat and hfs
2011-03-02 14:14 ` OGAWA Hirofumi
@ 2011-03-02 14:43 ` Karel Zak
2011-03-02 15:06 ` Karel Zak
2011-03-02 15:13 ` OGAWA Hirofumi
0 siblings, 2 replies; 6+ messages in thread
From: Karel Zak @ 2011-03-02 14:43 UTC (permalink / raw)
To: OGAWA Hirofumi; +Cc: linux-kernel, t.artem, Roman Zippel
On Wed, Mar 02, 2011 at 11:14:28PM +0900, OGAWA Hirofumi wrote:
> Karel Zak <kzak@redhat.com> writes:
>
> > The mount(8) command uses "quiet" mount option as a synonym to the
> > MS_SILENT mount flag (since util-linux 2.7, Aug 1997).
> >
> > It means than on systems where is properly defined the MS_SILENT
> > mount flags in headers is the "quiet" mount option always translated
> > to the MS_SILENT mount flags and "quiet" string is never send to FS
> > drivers.
> >
> > $ strace -e mount mount -o quiet /dev/sdb1 /mnt/test
> > mount("/dev/sdb1", "/mnt/test", "vfat", MS_MGC_VAL|MS_SILENT, NULL) = 0
> > ^^^^^^^^^
> >
> > Unfortunately,
> >
> > $ grep -r \"quiet\" *
> >
> > fat/inode.c: {Opt_quiet, "quiet"},
> > hfs/super.c: { opt_quiet, "quiet" },
> >
> > vfat and hfs drivers use "quiet" as a mount option. That's bug.
> >
> > There should not be a collision between mount(8) mount options and
> > filesystem specific mount options.
> >
> > My suggestion is to fix the fat and hfs code to use something other
> > than "quiet" (shutup, noisless, ...). I think you don't have to care
> > about backward compatibility, because it's probably broken for years.
>
> No. Actually the _new_ option is MS_SILENT. In history, there was no
> MS_SILENT (it was called MS_VERBOSE) in kernel, then _added_ newly, and
> never be enabled MS_SILENT in mount command until that.
I know, but I don't care which option is newer. I'd like to found a
solution with minimal impact to users.
> So, my suggestion is use "silent" (or something) as MS_SILENT for
> backward compatibility. Because the "quiet" is already hardcoded by some
> userland apps for vfat.
Then all people who use "quiet" in their fstab will see problems...
Karel
--
Karel Zak <kzak@redhat.com>
http://karelzak.blogspot.com
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: MS_SILENT vs. vfat and hfs
2011-03-02 14:43 ` Karel Zak
@ 2011-03-02 15:06 ` Karel Zak
2011-03-02 15:16 ` OGAWA Hirofumi
2011-03-02 15:13 ` OGAWA Hirofumi
1 sibling, 1 reply; 6+ messages in thread
From: Karel Zak @ 2011-03-02 15:06 UTC (permalink / raw)
To: OGAWA Hirofumi; +Cc: linux-kernel, t.artem, Roman Zippel
On Wed, Mar 02, 2011 at 03:43:03PM +0100, Karel Zak wrote:
> On Wed, Mar 02, 2011 at 11:14:28PM +0900, OGAWA Hirofumi wrote:
> > Karel Zak <kzak@redhat.com> writes:
> >
> > > The mount(8) command uses "quiet" mount option as a synonym to the
> > > MS_SILENT mount flag (since util-linux 2.7, Aug 1997).
> > >
> > > It means than on systems where is properly defined the MS_SILENT
> > > mount flags in headers is the "quiet" mount option always translated
> > > to the MS_SILENT mount flags and "quiet" string is never send to FS
> > > drivers.
> > >
> > > $ strace -e mount mount -o quiet /dev/sdb1 /mnt/test
> > > mount("/dev/sdb1", "/mnt/test", "vfat", MS_MGC_VAL|MS_SILENT, NULL) = 0
> > > ^^^^^^^^^
> > >
> > > Unfortunately,
> > >
> > > $ grep -r \"quiet\" *
> > >
> > > fat/inode.c: {Opt_quiet, "quiet"},
> > > hfs/super.c: { opt_quiet, "quiet" },
> > >
> > > vfat and hfs drivers use "quiet" as a mount option. That's bug.
> > >
> > > There should not be a collision between mount(8) mount options and
> > > filesystem specific mount options.
> > >
> > > My suggestion is to fix the fat and hfs code to use something other
> > > than "quiet" (shutup, noisless, ...). I think you don't have to care
> > > about backward compatibility, because it's probably broken for years.
> >
> > No. Actually the _new_ option is MS_SILENT. In history, there was no
> > MS_SILENT (it was called MS_VERBOSE) in kernel, then _added_ newly, and
> > never be enabled MS_SILENT in mount command until that.
>
> I know, but I don't care which option is newer. I'd like to found a
> solution with minimal impact to users.
>
> > So, my suggestion is use "silent" (or something) as MS_SILENT for
> > backward compatibility. Because the "quiet" is already hardcoded by some
> > userland apps for vfat.
>
> Then all people who use "quiet" in their fstab will see problems...
I'll probably add an exception for vfat and hfs to mount(8), "silent"
as MS_SILENT and mark "quiet" as deprecated for non-fat filesystems.
Karel
--
Karel Zak <kzak@redhat.com>
http://karelzak.blogspot.com
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: MS_SILENT vs. vfat and hfs
2011-03-02 14:43 ` Karel Zak
2011-03-02 15:06 ` Karel Zak
@ 2011-03-02 15:13 ` OGAWA Hirofumi
1 sibling, 0 replies; 6+ messages in thread
From: OGAWA Hirofumi @ 2011-03-02 15:13 UTC (permalink / raw)
To: Karel Zak; +Cc: linux-kernel, t.artem, Roman Zippel
Karel Zak <kzak@redhat.com> writes:
> On Wed, Mar 02, 2011 at 11:14:28PM +0900, OGAWA Hirofumi wrote:
>> Karel Zak <kzak@redhat.com> writes:
>>
>> > The mount(8) command uses "quiet" mount option as a synonym to the
>> > MS_SILENT mount flag (since util-linux 2.7, Aug 1997).
>> >
>> > It means than on systems where is properly defined the MS_SILENT
>> > mount flags in headers is the "quiet" mount option always translated
>> > to the MS_SILENT mount flags and "quiet" string is never send to FS
>> > drivers.
>> >
>> > $ strace -e mount mount -o quiet /dev/sdb1 /mnt/test
>> > mount("/dev/sdb1", "/mnt/test", "vfat", MS_MGC_VAL|MS_SILENT, NULL) = 0
>> > ^^^^^^^^^
>> >
>> > Unfortunately,
>> >
>> > $ grep -r \"quiet\" *
>> >
>> > fat/inode.c: {Opt_quiet, "quiet"},
>> > hfs/super.c: { opt_quiet, "quiet" },
>> >
>> > vfat and hfs drivers use "quiet" as a mount option. That's bug.
>> >
>> > There should not be a collision between mount(8) mount options and
>> > filesystem specific mount options.
>> >
>> > My suggestion is to fix the fat and hfs code to use something other
>> > than "quiet" (shutup, noisless, ...). I think you don't have to care
>> > about backward compatibility, because it's probably broken for years.
>>
>> No. Actually the _new_ option is MS_SILENT. In history, there was no
>> MS_SILENT (it was called MS_VERBOSE) in kernel, then _added_ newly, and
>> never be enabled MS_SILENT in mount command until that.
>
> I know, but I don't care which option is newer. I'd like to found a
> solution with minimal impact to users.
Sounds good.
>> So, my suggestion is use "silent" (or something) as MS_SILENT for
>> backward compatibility. Because the "quiet" is already hardcoded by some
>> userland apps for vfat.
>
> Then all people who use "quiet" in their fstab will see problems...
I don't know how to know the minimal impact though. I'll bet to change
MS_SILENT, because at least the mount command in debian/testing doesn't
provide "quiet" as MS_SILENT.
Thanks.
--
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-03-02 15:16 UTC | newest]
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2011-03-02 11:45 MS_SILENT vs. vfat and hfs Karel Zak
2011-03-02 14:14 ` OGAWA Hirofumi
2011-03-02 14:43 ` Karel Zak
2011-03-02 15:06 ` Karel Zak
2011-03-02 15:16 ` OGAWA Hirofumi
2011-03-02 15:13 ` OGAWA Hirofumi
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