lkml.org 
[lkml]   [2007]   [Feb]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC PATCH] add filesystem subtype support

Hi,

On Mon, 12 Feb 2007, Miklos Szeredi wrote:

> There's a slight problem with filesystem type representation in fuse
> based filesystems.
>
> >From the kernel's view, there are just two filesystem types: fuse and
> fuseblk. From the user's view there are lots of different filesystem
> types. The user is not even much concerned if the filesystem is fuse
> based or not.

Yes. Those who are concerned with the fstype and mount like

mount -t fstype device mountpoint

apparently expect mount/fstab line like

device mountpoint fstype ...

Of course the fstype could be fuse.subtype or fuseblk.subtype but that
would add a needless complexity (also, for example ntfs-3g uses both and
it decides run-time which one to use).

> So there's a conflict of interest in how this should be
> represented in fstab, mtab and /proc/mounts.
>
> The current scheme is to encode the real filesystem type in the mount
> source. So an sshfs mount looks like this:
>
> sshfs#user@server:/ /mnt/server fuse rw,nosuid,nodev,...
>
> This url-ish syntax works OK for sshfs and similar filesystems.
> However for block device based filesystems (ntfs-3g, zfs) it doesn't
> work, since the kernel expects the mount source to be a real device
> name.
>
> A possibly better scheme would be to encode the real type in the type
> field as "type.subtype". So fuse mounts would look like this:
>
> /dev/hda1 /mnt/windows fuseblk.ntfs-3g rw,...
> user@server:/ /mnt/server fuse.sshfs rw,nosuid,nodev,...

I think it's definitely an improvement because it solves real problems,
though perhaps not the way users would expect.

Szaka

-
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: 2007-02-12 14:09    [W:0.059 / U:0.364 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site