libblkid: ID_FS_VERSION

libblkid: ID_FS_VERSION

[Pali Rohár]

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Hi! What is the meaning of the ID_FS_VERSION attribute? I'm trying to 
find documentation about libblkid attributes, but seems there is none.

-- 
Pali Rohár
pali.rohar@gmail.com

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Re: libblkid: ID_FS_VERSION

[Karel Zak]

On Wed, Jul 05, 2017 at 01:49:26PM +0200, Pali Rohár wrote:
> Hi! What is the meaning of the ID_FS_VERSION attribute? I'm trying to 
> find documentation about libblkid attributes, but seems there is none.

libblkid/src/superblocks/superblocks.c

   * @VERSION: filesystem version

:-)

Well, the field is to provide more details about the filesystem, for
example we have VERSION="FAT16" TYPE="vfat", and so on. Note that TYPE
is usually name used by kernel (to be usable for "mount -t <type>").

I guess the VERSION is used by some userspace stuff (udisks?) to get
more information (or provide more details to end-users). It's probably
nothing critical.

    Karel

-- 
 Karel Zak  <kzak@redhat.com>
 http://karelzak.blogspot.com

Re: libblkid: ID_FS_VERSION

[Pali Rohár]

On Monday 10 July 2017 13:08:28 Karel Zak wrote:
> On Wed, Jul 05, 2017 at 01:49:26PM +0200, Pali Rohár wrote:
> > Hi! What is the meaning of the ID_FS_VERSION attribute? I'm trying to 
> > find documentation about libblkid attributes, but seems there is none.
> 
> libblkid/src/superblocks/superblocks.c
> 
>    * @VERSION: filesystem version
> 
> :-)

That does not provide more information :-)

> Well, the field is to provide more details about the filesystem, for
> example we have VERSION="FAT16" TYPE="vfat", and so on. Note that TYPE
> is usually name used by kernel (to be usable for "mount -t <type>").
> 
> I guess the VERSION is used by some userspace stuff (udisks?) to get
> more information (or provide more details to end-users). It's probably
> nothing critical.

I'm thinking if we can provide UDF revision/version of UDF filesystem to
userspace and looks like ID_FS_VERSION is good candidate for it...

What do you think?

E.g. Linux kernel is able to read UDF filesystem up to revision 2.50 and
has read-write support up to revision 2.01. So for userspace this
information can be useful.

-- 
Pali Rohár
pali.rohar@gmail.com

Re: libblkid: ID_FS_VERSION

[Karel Zak]

On Mon, Jul 10, 2017 at 01:15:09PM +0200, Pali Rohár wrote:
> On Monday 10 July 2017 13:08:28 Karel Zak wrote:
> > On Wed, Jul 05, 2017 at 01:49:26PM +0200, Pali Rohár wrote:
> > > Hi! What is the meaning of the ID_FS_VERSION attribute? I'm trying to 
> > > find documentation about libblkid attributes, but seems there is none.
> > 
> > libblkid/src/superblocks/superblocks.c
> > 
> >    * @VERSION: filesystem version
> > 
> > :-)
> 
> That does not provide more information :-)
> 
> > Well, the field is to provide more details about the filesystem, for
> > example we have VERSION="FAT16" TYPE="vfat", and so on. Note that TYPE
> > is usually name used by kernel (to be usable for "mount -t <type>").
> > 
> > I guess the VERSION is used by some userspace stuff (udisks?) to get
> > more information (or provide more details to end-users). It's probably
> > nothing critical.
> 
> I'm thinking if we can provide UDF revision/version of UDF filesystem to
> userspace and looks like ID_FS_VERSION is good candidate for it...
> 
> What do you think?

It seems blkid_probe_set_version() is nowhere used for UD now, so we have
absolute freedom to use it in some way.

> E.g. Linux kernel is able to read UDF filesystem up to revision 2.50 and
> has read-write support up to revision 2.01. So for userspace this
> information can be useful.

Yes, sounds good.

    Karel

-- 
 Karel Zak  <kzak@redhat.com>
 http://karelzak.blogspot.com

Re: libblkid: ID_FS_VERSION

[Pali Rohár]

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On Monday 10 July 2017 13:52:36 Karel Zak wrote:
> On Mon, Jul 10, 2017 at 01:15:09PM +0200, Pali Rohár wrote:
> > On Monday 10 July 2017 13:08:28 Karel Zak wrote:
> > > On Wed, Jul 05, 2017 at 01:49:26PM +0200, Pali Rohár wrote:
> > > > Hi! What is the meaning of the ID_FS_VERSION attribute? I'm
> > > > trying to find documentation about libblkid attributes, but
> > > > seems there is none.
> > > 
> > > libblkid/src/superblocks/superblocks.c
> > > 
> > >    * @VERSION: filesystem version
> > > :
> > > :-)
> > 
> > That does not provide more information :-)
> > 
> > > Well, the field is to provide more details about the filesystem,
> > > for example we have VERSION="FAT16" TYPE="vfat", and so on. Note
> > > that TYPE is usually name used by kernel (to be usable for
> > > "mount -t <type>").
> > > 
> > > I guess the VERSION is used by some userspace stuff (udisks?) to
> > > get more information (or provide more details to end-users).
> > > It's probably nothing critical.
> > 
> > I'm thinking if we can provide UDF revision/version of UDF
> > filesystem to userspace and looks like ID_FS_VERSION is good
> > candidate for it...
> > 
> > What do you think?
> 
> It seems blkid_probe_set_version() is nowhere used for UD now, so we
> have absolute freedom to use it in some way.
> 
> > E.g. Linux kernel is able to read UDF filesystem up to revision
> > 2.50 and has read-write support up to revision 2.01. So for
> > userspace this information can be useful.
> 
> Yes, sounds good.
> 
>     Karel

https://github.com/karelzak/util-linux/pull/483

-- 
Pali Rohár
pali.rohar@gmail.com

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